Patent Description:
Specifically, the present invention relates to a power tool of a generic type as defined in the generic part of independent claim <NUM> attached.

Document <CIT> discloses a power tool of the generic type defined above. Specifically, this document discloses an oscillatingly driven machine tool having a housing in which a motor with a motor shaft is received, on which an eccentric element is accommodated, with a spindle head, with a tool spindle that is rotatably mounted about its longitudinal axis in the spindle head, on which a coupling element is non-rotatably received which cooperates with the eccentric element for generating a movement of the tool spindle which oscillates about its longitudinal axis such that, in addition to the oscillating movement, a differing, superimposed movement is introduced into the coupling element.

Document <CIT> discloses a power tool including a housing, an output shaft for fixing and driving a head to work, the output shaft being provided with a receiving portion extending out of the housing, a locking member for locking the head on the receiving portion of the output shaft, a fastener supported on the output shaft for fastening the locking member, and a driving mechanism rotatably displaced on the housing. The driving mechanism is operable to rotate along a first direction to make the fastener and the locking member screwed and is operable to rotate along a direction opposite to the first direction to loosen the fastener and the locking member.

Document <CIT> discloses an oscillating power tool comprising a housing, a motor, a drive shaft, an output shaft driven by the drive shaft to oscillate around its own axis at a certain angle of oscillation, and an eccentric transmission mechanism converting the rotational movement of the drive shaft to the oscillation of the output shaft. The eccentric transmission mechanism comprises an eccentric apparatus mounted on the drive shaft and a shift fork assembly respectively connected to the eccentric apparatus and the output shaft. The eccentric apparatus comprises at least two drive members, the shift fork assembly comprises a first shift fork member and a second shift fork member, wherein the first shift fork member has a first cooperating part cooperating with the drive member and a second cooperating part cooperating with the second shift fork member, and the second shift fork member is connected to the output shaft. The oscillating power tool further comprises an adjusting mechanism placed on the housing, wherein the adjusting mechanism operably adjusts the movement of the first shift fork member, such that the first cooperating part abuts a different drive member, the second cooperating part abuts a different position of the second shift fork member, and the output shaft has a different angle of oscillation.

As a power tool, an oscillating power tool generally drives the oscillation of a work attachment through an oscillating member so as to perform cutting, grinding, and other operations on an object. The high-frequency vibration of the oscillating member generates noise. When the oscillating power tool cuts a workpiece, the noise generated by the oscillating member is even greater, affecting the operating experience of an operator.

The present invention provides a power tool as defined in independent claim <NUM> attached. Preferred embodiments of this power tool are defined in dependent claims attached.

In this application, the terms "up", "down", "left", "right", "front", and "rear" " and other directional words are described based on the orientation or positional relationship shown in the drawings, and should not be understood as limitations to the examples of this application. In addition, in this context, it also needs to be understood that when it is mentioned that an element is connected "above" or "under" another element, it can not only be directly connected "above" or "under" the other element, but can also be indirectly connected "above" or "under" the other element through an intermediate element. It should also be understood that orientation words such as upper side, lower side, left side, right side, front side, and rear side do not only represent perfect orientations, but can also be understood as lateral orientations. For example, lower side may include directly below, bottom left, bottom right, front bottom, and rear bottom.

In this application, the terms "controller", "processor", "central processor", "CPU" and "MCU" are interchangeable. Where a unit "controller", "processor", "central processing", "CPU", or "MCU" is used to perform a specific function, the specific function may be implemented by a single aforementioned unit or a plurality of the aforementioned unit.

In this application, the term "device", "module" or "unit" may be implemented in the form of hardware or software to achieve specific functions.

In this application, the terms "computing", "judging", "controlling", "determining", "recognizing" and the like refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

As shown in <FIG>, a power tool <NUM> in the present application may be a hand-held oscillating power tool, such as an oscillating multifunctional tool, where the power tool <NUM> includes multiple work attachments <NUM>, such as a blade, a triangular sander, a metal saw blade, a woodworking saw blade, and a silicon carbide saw blade. Through these different work attachments <NUM>, the power tool <NUM> can implement functions such as sawing, sanding, filing, and scraping.

As shown in <FIG>, the power tool <NUM> in the present invention includes a tool body 100a. The tool body 100a includes a housing <NUM>, a power mechanism <NUM>, a polarization mechanism <NUM>, an output mechanism <NUM>, a heat dissipation mechanism <NUM>, a shock absorbing mechanism <NUM>, and a power source. The power source in the present application is a battery pack <NUM>, and the battery pack <NUM> may be mounted to a battery pack coupling portion <NUM>. Of course, in other examples, the power source may include a plug and a cable of external mains power. The power tool <NUM> further includes a main control assembly <NUM> used for controlling the power tool <NUM> and connected to the power source.

As shown in <FIG>, the housing <NUM> forms an accommodation space. The housing <NUM> includes a first housing <NUM> and a second housing <NUM>, where the first housing <NUM> and the second housing <NUM> together form the housing of the tool, and the second housing <NUM> is formed with a grip 112a for a user to hold. The first housing <NUM> may partially extend into the second housing <NUM> so that the first housing <NUM> and the second housing <NUM> are combined into a whole. Of course, the first housing <NUM> may not extend into the second housing <NUM>, and the first housing <NUM> and the second housing <NUM> may be connected into a whole through other connecting components such as screws.

As shown in <FIG>, the power mechanism <NUM> in the example of the present application includes a power housing, where the power housing includes a motor housing <NUM> and a transmission housing <NUM>, where the polarization mechanism <NUM> and the output mechanism <NUM> are accommodated in the transmission housing <NUM>, and a motor <NUM> and a motor shaft <NUM> configured to be a drive shaft are accommodated in the motor housing <NUM>. The transmission housing <NUM> is at least partially coated by the first housing <NUM> and extends from the first housing <NUM> into the second housing <NUM>.

As shown in <FIG>, the second housing <NUM> may specifically include a left housing 112b and a right housing 112c, where the left housing 112b and the right housing 112c are basically symmetrical about a first middle plane <NUM> as shown in <FIG> and <FIG> so that the grip 112a formed by the left housing 112b and the right housing 112c is also basically symmetrical about the first middle plane <NUM>, and the first housing <NUM> is also basically symmetrical about the first middle plane <NUM>.

As shown in <FIG>, the motor housing <NUM> is disposed in the second housing <NUM>, and the motor shaft <NUM> extends into the transmission housing <NUM> and is connected to the polarization mechanism <NUM>. The motor shaft <NUM> is an eccentric shaft and specifically includes a first shaft portion <NUM> and a second shaft portion <NUM>. A centerline of the second shaft portion <NUM> is spaced apart from a centerline of the first shaft portion <NUM> by an equal distance, the first shaft portion <NUM> is drivingly connected to the polarization mechanism <NUM>, and the second shaft portion <NUM> is connected to the heat dissipation mechanism <NUM>. Of course, in another example, the motor shaft <NUM> may be connected to the motor <NUM> through a conventional transmission mechanism, where the motor shaft <NUM> is an eccentric shaft. A support cavity <NUM> is provided on the inner side of the motor housing <NUM> and used for mounting a bearing supporting the motor shaft <NUM>.

The polarization mechanism <NUM> in this example is used for directly generating vibration. As shown in <FIG>, the polarization mechanism <NUM> includes a support assembly <NUM> and an oscillating member <NUM>, where the oscillating member <NUM> is specifically a shift fork. Specifically, as shown in <FIG>, the support assembly <NUM> in this example includes a bearing <NUM> and a ball sleeve <NUM>, where the ball sleeve <NUM> is sleeved on the first shaft portion <NUM> of the motor shaft <NUM> through the bearing <NUM>. When the second shaft portion <NUM> rotates, the bearing <NUM> is driven by the first shaft portion <NUM> to reciprocate left and right in the left and right direction perpendicular to the first middle plane <NUM>. The bearing <NUM> in this example is a double row ball bearing to improve the strength with which the oscillating member <NUM> is supported.

The motor shaft <NUM> is rotatable around a motor axis <NUM>. It is to be noted that, since the motor shaft <NUM> is an eccentric shaft, the second shaft portion <NUM> of the motor axis <NUM> has a different centerline from the first shaft portion <NUM> of the motor <NUM>. The motor axis <NUM> mentioned in the present application actually refers to a rotation axis of the rotor of the motor <NUM>, which is also a rotation axis of the heat dissipation mechanism <NUM> in this example. The motor <NUM> is a brushless motor.

As shown in <FIG>, the power tool <NUM> further includes an air guide hood <NUM> disposed around the heat dissipation mechanism <NUM> and partially or fully overlapping with the heat dissipation mechanism <NUM> in an axial direction to guide the airflow of an airflow element of the heat dissipation mechanism <NUM> towards an air outlet.

As shown in <FIG> and <FIG>, the ball sleeve <NUM> is sleeved on the outside of the bearing <NUM> and is rollably connected to the bearing <NUM>. The ball sleeve <NUM> has a partial outer circular surface, and the oscillating member <NUM> includes a partial inner circumferential surface mating with the ball sleeve <NUM>, where the partial inner circumferential surface of the oscillating member <NUM> is sleeved on the partial outer circular surface and the oscillating member <NUM> can be driven by the ball sleeve <NUM> to move.

Referring to <FIG>, the output mechanism <NUM> in this example includes an output shaft <NUM> for outputting power, where the output shaft <NUM> that is not in a working state has an output shaft axis <NUM> substantially extending in a vertical direction. The oscillating member <NUM> includes a mounting portion <NUM> and an oscillating fork <NUM>. The oscillating fork <NUM> is sleeved outside the partial outer circular surface of the ball sleeve <NUM> and is at least rotatable relative to the ball sleeve <NUM>, and the mounting portion <NUM> forms a sleeve <NUM> (shown in <FIG>) sleeved on the output shaft <NUM> of the output mechanism <NUM>. Referring to <FIG>, when the oscillating fork <NUM> is not in operation, two fork rods of the oscillating fork <NUM> are separately located on the left and right sides of the first middle plane <NUM>. Therefore, when the ball sleeve <NUM> moves, the ball sleeve <NUM> repeatedly strikes the fork rods on the left and right sides in the left and right direction so that the oscillating fork <NUM> oscillates left and right, the output shaft <NUM> is driven by the oscillating fork <NUM> to oscillate within an oscillation range, and finally the work attachment <NUM> is driven to oscillate. It is to be understood that in this example, a direction F of an exciting force of the polarization generated by the power tool <NUM> in operation is basically perpendicular to the first middle plane <NUM>. In other words, the work attachment <NUM> vibrates in a reciprocating manner along the direction basically perpendicular to the first middle plane <NUM>.

Referring to <FIG>, the output mechanism <NUM> further includes a mounting assembly <NUM> disposed on the output shaft <NUM> and drivingly connected to the oscillating member <NUM> through the output shaft <NUM>. Multiple work attachments <NUM> are selectively mounted and connected to the mounting assembly <NUM>. The mounting assembly <NUM> in this example is a clamp.

The oscillating multifunctional tool in this example vibrates mainly in the following manner: the eccentric shaft drives the bearing <NUM> and the ball sleeve <NUM> to rotate and the rotating ball sleeve <NUM> repeatedly strikes the oscillating member <NUM>. Therefore, the whole formed by the bearing <NUM>, the ball sleeve <NUM>, and the oscillating member <NUM>, that is, the polarization mechanism <NUM>, may be considered as a vibration source.

As shown in <FIG> and <FIG>, a first bearing assembly <NUM> and a second bearing assembly <NUM> are sleeved on the output shaft <NUM>, where the first bearing assembly <NUM> is located on the upper side of the mounting portion <NUM>, and the second bearing assembly <NUM> is located on the lower side of the mounting portion <NUM>. Specifically, a first bearing <NUM> is disposed on the upper side of the oscillating member <NUM>, a second bearing <NUM> is disposed on the lower side of the oscillating member <NUM>, and both the first bearing <NUM> and the second bearing <NUM> are sleeved on the output shaft <NUM>. Each bearing in the first bearing assembly <NUM> and the second bearing assembly <NUM> may be a ball bearing, a needle roller bearing, or the like, which is not limited here.

A first plane <NUM> bisects the height of the first bearing assembly <NUM> along the direction of the output shaft axis <NUM>, and the first plane <NUM> basically extends along the front and rear direction. A second plane <NUM> bisects the height of the second bearing assembly <NUM> along the direction of the output shaft axis <NUM>, and the second plane <NUM> basically extends along the front and rear direction.

As shown in <FIG>, the ball sleeve <NUM> and the oscillating fork <NUM> are engaged in an engagement region <NUM>, and the geometric center of the engagement region <NUM> is an engagement center <NUM>. In this example, since the engagement region <NUM> is symmetrical about the first middle plane <NUM>, the engagement center <NUM> includes a first engagement center <NUM> on the left side and a second engagement center <NUM> on the right side. The sleeve <NUM> of the mounting portion <NUM> has a second radius R2, the sleeve <NUM> has a sleeve center <NUM>, and the line connecting the first engagement center <NUM> and the second engagement center <NUM> of the oscillating fork <NUM> is an engagement centerline <NUM> (shown in <FIG>).

As shown in <FIG>, the distance between the first plane <NUM> and the engagement center <NUM> is defined as a first height H1, the distance between the second plane <NUM> and the engagement center <NUM> is defined as a second height H2, and the ratio H1/H2 of the first height H1 to the second height H2 is greater than or equal to <NUM> and less than or equal to <NUM>. In an example, the ratio H1/H2 of the first height H1 to the second height H2 is greater than or equal to <NUM> and less than or equal to <NUM>. The difference between the first height H1 and the second height H2 is less than or equal to <NUM>.

In an example, the first height H1 is <NUM>, the second height H2 is <NUM>, the ratio of the first height H1 to the second height H2 is <NUM>, and the difference between the first height H1 and the second height H2 is <NUM>. In another example, the first height H1 is <NUM>, the second height H2 is <NUM>, the ratio of the first height H1 to the second height H2 is <NUM>, and the difference between the first height H1 and the second height H2 is <NUM>. That is to say, in some examples, the difference between the first height H1 and the second height H2 is less than or equal to <NUM>; in some examples, the difference between the first height H1 and the second height H2 is greater than <NUM> and less than or equal to <NUM>; in some examples, the difference between the first height H1 and the second height H2 is greater than <NUM> and less than or equal to <NUM>; in some examples, the difference between the first height H1 and the second height H2 is greater than <NUM> and less than or equal to <NUM>.

As shown in <FIG>, a third plane <NUM> perpendicular to the output shaft axis <NUM> exists, where the third plane <NUM> bisects the mounting portion <NUM> along the direction of the output shaft axis <NUM>, and the distance from the engagement center <NUM> to the third plane is a third distance H3, where the third distance H3 is less than or equal to <NUM>.

In an example, as shown in <FIG>, the first bearing assembly <NUM> includes the first bearing <NUM> and a third bearing <NUM>, where the third bearing <NUM> is located above the first bearing <NUM>. In this case, the first plane <NUM> bisects the total thickness of the first bearing <NUM> and the third bearing <NUM> along the direction of the output shaft axis <NUM>. That is to say, for the first bearing assembly <NUM>, the first plane <NUM> is a middle plane between the uppermost surface of the bearing on the upper side and the lowermost surface of the bearing on the lower side in the first bearing assembly <NUM>. The same goes for the second bearing assembly <NUM> and the second plane <NUM>. In an example, the second bearing assembly <NUM> further includes a fourth bearing (not shown in the figure), where the fourth bearing is located below the second bearing <NUM>.

In the existing art, the ratio of the first height H1 to the second height H2 is generally configured to be less than <NUM>, causing a large difference in distance between the mounting portion <NUM> and the two bearing assemblies located on two sides of the mounting portion <NUM>. In this case, the shock absorbing effect provided by the first bearing assembly <NUM> and the second bearing assembly <NUM> to the output shaft <NUM> is unbalanced, the effects of the upper and lower shock absorbing assemblies are not fully utilized, and the noise generated by the vibration of the output shaft <NUM> is excessively big.

Through creative work, calculation, and reasoning, the applicant found that the relative magnitudes of the first height H1 and the second height H2 have an effect on the vibration and noise of the power tool <NUM> and verified the preceding inventive discovery of the applicant through simulations and experiments. The relative positions between the bearing assemblies and the oscillating member <NUM> are limited above so that the stability of the output shaft <NUM> is increased, the noise generated when the oscillating member <NUM> drives the output shaft <NUM> to rotate is reduced, and the structural relationship between the output shaft <NUM>, the oscillating member <NUM>, the first bearing assembly <NUM>, and the second bearing assembly <NUM> is achievable. The ratio of the first height H1 to the second height H2 may be adjusted by increasing the thickness of the first bearing <NUM> and/or reducing the thickness of the second bearing <NUM>, thereby reducing the vibration and noise of the whole machine.

Referring to <FIG>, the oscillating member <NUM> and the ball sleeve <NUM> are engaged in the engagement region <NUM> on the oscillating member <NUM>, the geometric center of the engagement region <NUM> is defined as the engagement center <NUM>, and the distance between the engagement center <NUM> and the output shaft axis <NUM> in the front and rear direction is a first radius R1, where the first radius R1 is less than or equal to <NUM>. In an example, the first radius R1 is less than or equal to <NUM>. In an example, the first radius R1 is less than or equal to <NUM>. In some examples, the first radius R1 may be <NUM>, <NUM>, <NUM>, or <NUM>.

As shown in <FIG>, the oscillating member <NUM> includes the mounting portion <NUM>, the mounting portion <NUM> is sleeved on an outer circumference <NUM> of the output shaft <NUM>, and the inner radius of the mounting portion <NUM> is a second radius R2, where the ratio R2/R1 of the second radius R2 to the first radius R1 is greater than or equal to <NUM> and less than <NUM>. In some examples, the ratio R2/R1 of the second radius R2 to the first radius R1 is greater than or equal to <NUM> and less than <NUM>. In some examples, the ratio R2/R1 of the second radius R2 to the first radius R1 is greater than or equal to <NUM> and less than <NUM>. In an example, the first radius R1 is about <NUM>, the second radius R2 is about <NUM>, and the ratio R2/R1 of the second radius R2 to the first radius R1 is <NUM>.

The first radius R1 may be understood as the oscillation radius of the ball sleeve <NUM>, so the first radius R1 is also the distance from the output shaft axis <NUM> to the engagement center <NUM> of the oscillating member <NUM>. In the existing art, the first radius R1 is generally greater than <NUM>. In the present application, the value of the first radius R1 is limited so that the stiffness and natural frequency of the oscillating member <NUM> can be improved, the deformation range of the ball sleeve <NUM> can be reduced, and the effect of noise reduction can be achieved.

The maximum diameter D of the ball sleeve <NUM> is greater than or equal to <NUM> and less than or equal to <NUM>. In some examples, the maximum diameter D of the ball sleeve <NUM> is greater than or equal to <NUM> and less than or equal to <NUM>. In some examples, the maximum diameter D of the ball sleeve <NUM> is greater than or equal to <NUM> and less than or equal to <NUM>. In some examples, the maximum diameter D of the ball sleeve <NUM> is about <NUM>, <NUM>, or <NUM>.

The shock absorbing mechanism <NUM> of the power tool <NUM> is described below. The shock absorbing mechanism <NUM> is used for performing shock absorbing on the power tool <NUM> so that the operator can have a better grip experience when holding the grip 112a and is less likely to be fatigued after the long-term operation. The shock absorbing mechanism <NUM> is provided between the power housing and the inner wall of the housing and used for mitigating or reducing the effect of the vibration of the whole machine in the running process on the power mechanism <NUM>. In this example, the shock absorbing mechanism <NUM> includes at least two shock absorbing assemblies <NUM> in different dimensions, where the multiple shock absorbing assemblies <NUM> separately surround the transmission housing <NUM> and/or the motor housing <NUM> and are used for separately damping forces in different directions. That is to say, at least two shock absorbing assemblies <NUM> are separately provided between the power housing and the inner wall of the housing.

As shown in <FIG>, the left housing 112b of the power tool <NUM> is disassembled to expose a first shock absorbing assembly <NUM>, a second shock absorbing assembly <NUM>, a third shock absorbing assembly <NUM>, and a fourth shock absorbing assembly <NUM>. The first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> are located on the left side of the motor shaft <NUM> and basically arranged along the front and rear direction, and the first shock absorbing assembly <NUM> is located on the front side of the second shock absorbing assembly <NUM>. The third shock absorbing assembly <NUM> is located on the upper side of the motor shaft <NUM> and also on the upper side of the motor axis <NUM>.

The first shock absorbing assembly <NUM> is located on the front side of the power tool <NUM> and is close to the output mechanism <NUM>. In this example, the first shock absorbing assembly <NUM> is located between the output shaft axis <NUM> and the motor <NUM> in the front and rear direction. That is to say, the projection of the first shock absorbing assembly <NUM> on the first middle plane <NUM> is located between the output shaft axis <NUM> and the motor <NUM>.

The second shock absorbing assembly <NUM> is located on the rear side of the first shock absorbing assembly <NUM>. In this example, the second shock absorbing assembly <NUM> is located on the rear side of the motor <NUM>. It is to be noted that the motor <NUM> mentioned here does not include the motor shaft <NUM>, and the second shock absorbing assembly <NUM> may partially coincide with the motor shaft <NUM> in the direction of the motor axis <NUM>. In this example, the second shock absorbing assembly <NUM> is located between the motor <NUM> and the battery pack <NUM>, that is to say, the second shock absorbing assembly <NUM> is located between the motor <NUM> and the battery pack coupling portion <NUM>.

In this example, the first shock absorbing assembly <NUM> includes a first shock absorber <NUM> and a second shock absorber <NUM>. The first shock absorber <NUM> and the second shock absorber <NUM> are arranged basically along the front and rear direction, and the first shock absorber <NUM> is located on the front side of the second shock absorber <NUM>. In this example, the second shock absorbing assembly <NUM> includes a third shock absorber <NUM>. That is to say, in this example, the first shock absorbing assembly <NUM> is composed of two shock absorbers <NUM> (shown in <FIG>), while the second shock absorbing assembly <NUM> includes only one shock absorber <NUM>.

As shown in <FIG>, each shock absorbing assembly is composed of the shock absorber <NUM>, and the shock absorber <NUM> is made of an elastically deformable material. In this example, the shock absorber <NUM> may be a type of rubber pad. The shock absorber <NUM> is mounted in the power tool <NUM> along the direction of a mounting axis <NUM>. In this example, the shock absorber <NUM> may be cylindrical or cubic. That is to say, the projection of the shock absorber <NUM> on a plane perpendicular to the mounting axis <NUM> may be circular, cylindrical, square, rectangular, or other shapes. In addition, the shock absorber <NUM> may also be configured to be a shock absorbing ring surrounding the outer side of the motor housing <NUM> as shown in the fourth shock absorbing assembly <NUM> in <FIG>. The shape, surrounding manner, and arrangement manner of the shock absorber <NUM> are not limited.

The shock absorber <NUM> includes an outer surface <NUM>. The thickness D1 of the shock absorber <NUM> may be configured to be <NUM> to <NUM>. In an example, the thickness D1 of the shock absorber <NUM> is <NUM> to <NUM>. The diameter D2 of the shock absorber <NUM> may be configured to be <NUM> to <NUM>. In an example, the diameter D2 of the shock absorber <NUM> may be configured to be <NUM> to <NUM>. In an example, the diameter D2 of the shock absorber <NUM> may be configured to be <NUM> to <NUM>.

The shock absorbing mechanism <NUM> includes at least two shock absorbing assemblies, and each shock absorbing assembly includes at least one shock absorber <NUM>. As shown in <FIG>, the minimum distance between the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> is defined as a third length T3, where the third length T3 is greater than or equal to <NUM>. In an example, the third length T3 is greater than or equal to <NUM>. In an example, the third length T3 is greater than or equal to <NUM>. In an example, the third length T3 is greater than or equal to <NUM>. In some examples, the third length T3 may be set to <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>. Two shock absorbing assemblies here can also be understood as two sets of shock absorbing assemblies.

It is to be noted that the "shock absorbing assembly" mentioned in the present application includes at least one shock absorber <NUM>, and the shock absorbing assembly may include only one shock absorber <NUM> or may be a combination of two or more shock absorbers <NUM>. As shown in <FIG>, to distinguish the first shock absorbing assembly <NUM> from the second shock absorbing assembly <NUM>, the third length T3 between the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> is greater than or equal to <NUM>. That is to say, when two shock absorbers <NUM> are provided in the power tool <NUM>, if the third length T3 between the two shock absorbers <NUM> is less than <NUM>, the two shock absorbers <NUM> are considered to be from the same shock absorbing assembly; if the third length T3 between the two shock absorbers <NUM> is greater than or equal to <NUM>, the two shock absorbers <NUM> are considered to be from two shock absorbing assemblies, such as the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM>. It is to be noted that the third length T3 refers to the minimum distance between the two shock absorbing assemblies <NUM> measured along the outer surface of the shock absorber <NUM>, and the shock absorber <NUM> should be prevented from being deformed by pressure during measurement.

In conjunction with <FIG> and <FIG>, the third shock absorbing assembly <NUM> includes a fourth shock absorber <NUM> and a positioning member <NUM>, where the positioning member <NUM> is sleeved on the fourth shock absorber <NUM>. The positioning member <NUM> may be used for limiting the position of the fourth shock absorber <NUM>. The fourth shock absorber <NUM> and the positioning member <NUM> are made of different materials. In an example, the fourth shock absorber <NUM> and the positioning member <NUM> may be elastic members with different densities, thereby improving the damping and shock absorbing effect on a lead securing portion <NUM>. In an example, the positioning member <NUM> is a rigid member.

As shown in <FIG>, the fourth shock absorbing assembly <NUM> is made of a flexible element, specifically an annular sponge pad or an annular rubber pad. The fourth shock absorbing assembly <NUM> may be directly fixed on the outside of the motor housing <NUM>, for example, glued to an outer circumference of the motor housing <NUM> or directly fixed on the inner wall of the housing.

In addition, on the right side of the motor shaft <NUM>, a fifth shock absorbing assembly corresponding to the first shock absorbing assembly <NUM> is symmetrical about the first middle plane <NUM>, and a sixth shock absorbing assembly corresponding to the second shock absorbing assembly <NUM> is symmetrical about the first middle plane <NUM>. As shown in <FIG> and <FIG>, a seventh shock absorbing assembly <NUM> is further disposed below the motor shaft <NUM>. The detailed description is not made here.

It is to be noted that in the shock absorbing assemblies described above, the mounting axes <NUM> of the shock absorbers <NUM> in the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> are basically parallel, so the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> are on the same latitude. The mounting axis <NUM> of the third shock absorbing assembly <NUM> is basically perpendicular to the mounting axis <NUM> of the first shock absorbing assembly <NUM>, so the third shock absorbing assembly <NUM> and the first shock absorbing assembly <NUM> are on different latitudes. It is also to be understood that the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> are located on the left side of the motor shaft <NUM>, the third shock absorbing assembly <NUM> is located on the upper side of the motor shaft <NUM>, and the fourth shock absorbing assembly <NUM> surrounds the motor shaft <NUM> along the circumferential direction. This is called "different dimensions", and the multiple shock absorbing assemblies in different dimensions are used for separately damping forces in different directions.

With continued reference to <FIG>, the maximum span formed by the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> in the front and rear direction is defined as a first length T1, where the first length T1 is greater than or equal to <NUM>. It is to be noted that the first length T1 refers to the maximum span formed by each shock absorber <NUM> in the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> along the front and rear direction. In this example, the front and rear direction is the direction of the motor axis <NUM>. In addition, the first length T1 needs to be measured along the outer surface of the shock absorber <NUM>, and the shock absorber <NUM> should be prevented from being deformed by pressure during measurement.

In an example, the first length T1 is greater than or equal to <NUM>. In an example, the first length T1 is greater than or equal to <NUM>. In an example, the first length T1 is greater than or equal to <NUM>. In an example, the first length T1 is less than or equal to <NUM>. In an example, the first length T1 is less than or equal to <NUM>. In an example, the first length T1 is less than or equal to <NUM>. In some examples, the first length T1 is about <NUM>, <NUM>, <NUM>, or <NUM>.

It is to be noted that the above only limits the first length T1 between the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> and does not limit other shock absorbing assemblies. That is to say, the distance between the third shock absorbing assembly <NUM> and the first shock absorbing assembly <NUM> is not affected by the distance between the second shock absorbing assembly <NUM> and the first shock absorbing assembly <NUM>, and the third shock absorbing assembly <NUM> may be basically located on the same vertical line with the second shock absorbing assembly <NUM> or keep a certain distance from the second shock absorbing assembly <NUM>.

In addition, although in this example, the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> are basically arranged along the front and rear direction, in other examples, the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> may also be staggered up and down, that is, a certain height difference exists between the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> in the up and down direction. In this case, the mounting axes <NUM> of the shock absorbers <NUM> of the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> may not be in parallel, that is, form an included angle.

As shown in <FIG>, the first shock absorbing assembly <NUM> has the first shock absorbing center C1, and the second shock absorbing assembly <NUM> has the second shock absorbing center C2. In this example, the first shock absorbing center C1 is the center of the line connecting the geometric centers of the first shock absorber <NUM> and the second shock absorber <NUM>, and the second shock absorbing center C2 is the geometric center of the third shock absorber <NUM>.

The distance between the first shock absorbing center C1 and the output shaft axis <NUM> is defined as a first distance L1, and the distance between the first shock absorbing center C1 and the second shock absorbing center C2 is defined as a second distance L2.

The first distance L1 is greater than or equal to <NUM> and less than or equal to <NUM>. In an example, the first distance L1 is greater than or equal to <NUM> and less than or equal to <NUM>. In an example, the first distance L1 is greater than or equal to <NUM> and less than or equal to <NUM>. The second distance L2 is greater than or equal to <NUM> and less than or equal to <NUM>. In an example, the second distance L2 is greater than or equal to <NUM> and less than or equal to <NUM>. In an example, the second distance L2 is greater than or equal to <NUM> and less than or equal to <NUM>. In an example, the second distance L2 is greater than or equal to <NUM> and less than or equal to <NUM>.

The ratio of the first distance L1 to the second distance L2 is less than or equal to <NUM>. In an example, the ratio of the first distance L1 to the second distance L2 is less than or equal to <NUM>. In an example, the ratio of the first distance L1 to the second distance L2 is less than or equal to <NUM>. In an example, the ratio of the first distance L1 to the second distance L2 is greater than or equal to <NUM>. In an example, the ratio of the first distance L1 to the second distance L2 is greater than or equal to <NUM>. In an example, the first distance L1 is about <NUM>, the second distance L2 is about <NUM>, and the ratio of the first distance to the second distance is about <NUM>. In an example, the first distance L1 is about <NUM>, the second distance L2 is about <NUM>, and the ratio of the first distance to the second distance is about <NUM>. In an example, the first distance L1 is about <NUM>, the second distance L2 is about <NUM>, and the ratio of the first distance to the second distance is about <NUM>.

In more examples, referring to <FIG>, the shock absorbing center C of a shock absorbing assembly <NUM> may have various forms. As shown in FIG. 27A, when the shock absorbing assembly <NUM> includes only one shock absorber <NUM>, a first shock absorbing center C11 is the geometric center of the shock absorber <NUM>. As shown in FIGS. 27B to 27D, when the shock absorbing assembly <NUM> includes only two shock absorbers <NUM>, no matter whether the two shock absorbers <NUM> are arranged up and down or front and rear or arranged at an included angle with the motor axis <NUM>, the first shock absorbing center is the center of gravity of the line connecting the geometric centers of the two shock absorbers <NUM>, such as a second shock absorbing center C12, a third shock absorbing center C13, and a fourth shock absorbing center C14. As shown in FIG. 27E, when the shock absorbing assembly <NUM> includes only three shock absorbers <NUM>, a first shock absorbing center C13 is the center of the triangle formed by the lines connecting the geometric centers of the three shock absorbers <NUM>. Specifically, the center of the triangle is mathematically defined as the point of intersection of three medians of the triangle. Further, in an example, if the shock absorbing assembly <NUM> includes only four shock absorbers <NUM>, the first shock absorbing center is the center of the quadrilateral formed by the lines connecting the geometric centers of the four shock absorbers <NUM>. The same goes for the case where the shock absorbing assembly <NUM> includes more shock absorbers <NUM>.

As shown in <FIG>, if the number of shock absorbers <NUM> included in the shock absorbing assembly <NUM> is greater than or equal to two, the minimum distance S1 between the outer surfaces <NUM> of any two shock absorbers <NUM> in the same shock absorbing assembly <NUM> is less than <NUM>. The minimum distance here refers to the distance between the outer surfaces <NUM> of two shock absorbers <NUM> in a natural state, that is, the distance between the outer surfaces <NUM> of the two shock absorbers <NUM> that are not compressed and elastically deformed. That is to say, when the number of shock absorbers included in the first shock absorbing assembly is greater than or equal to two, the minimum distance S1 between any two shock absorbers in the first shock absorbing assembly is less than <NUM>; when the number of shock absorbers included in the second shock absorbing assembly is greater than or equal to two, the minimum distance S1 between any two shock absorbers in the second shock absorbing assembly is also less than <NUM>.

In an example, the minimum distance S1 between the outer surfaces <NUM> of any two shock absorbers <NUM> in the same shock absorbing assembly <NUM> is less than <NUM>; in an example, the minimum distance S1 between the outer surfaces <NUM> of any two shock absorbers <NUM> in the same shock absorbing assembly <NUM> is less than <NUM>; in an example, the minimum distance S1 between the outer surfaces <NUM> of any two shock absorbers <NUM> in the same shock absorbing assembly <NUM> is less than <NUM>.

It is to be noted that any shock absorbing assembly <NUM> may include one or more shock absorbers <NUM> according to the manner in the preceding description, and the shock absorbing center C of the shock absorbing assembly <NUM> is also determined according to the preceding description. In an example, each of the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> may include two or more shock absorbers <NUM>.

In addition, referring to <FIG> and <FIG>, in this example, in addition to the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM>, the power tool <NUM> further includes the third shock absorbing assembly <NUM> and the fourth shock absorbing assembly <NUM>. The position of the projection of the second shock absorbing center C2 of the second shock absorbing assembly <NUM> on the motor axis <NUM> basically coincides with the position of the projection of the third shock absorbing center of the third shock absorbing assembly <NUM> on the motor axis <NUM>. That is to say, along the front and rear direction of the power tool <NUM>, the distance from the second shock absorbing center C2 to the output shaft axis <NUM> is basically equal to the distance from the third shock absorbing center to the output shaft axis <NUM>.

The shock absorbing assembly farthest from the output shaft axis is defined as the farthest shock absorbing assembly, and the maximum distance from the farthest shock absorbing assembly to the output shaft axis is a second length T2, where the second length T2 is greater than or equal to <NUM>.

First, the shock absorbing assembly farthest from the output shaft axis <NUM> is determined. In this example, the farthest shock absorbing assembly farthest from the output shaft axis <NUM> is the second shock absorbing assembly <NUM>. The second length T2 between the shock absorbing assembly farthest from the output shaft axis <NUM> and the output shaft axis <NUM> is greater than or equal to <NUM>. The farthest shock absorbing distance defined here refers to the distance from an outer edge <NUM> of the shock absorber <NUM> to the output shaft axis <NUM>. In other examples, the second length T2 between any shock absorbing assembly <NUM> farthest from the output shaft axis <NUM> along the front and rear direction and the output shaft axis <NUM> is greater than or equal to <NUM>. In an example, the second length T2 between the farthest shock absorbing assembly <NUM> and the output shaft axis <NUM> is greater than or equal to <NUM>. In an example, the second length T2 between the farthest shock absorbing assembly <NUM> and the output shaft axis <NUM> is greater than or equal to <NUM>. In an example, the second length T2 between the farthest shock absorbing assembly <NUM> and the output shaft axis <NUM> is greater than or equal to <NUM>.

As shown in <FIG>, the overall length L of the power tool <NUM> is the distance from the output mechanism <NUM> at the frontmost end of the power tool <NUM> to the rearmost side of the battery pack <NUM> at the rearmost end of the power tool <NUM>. In an example, the overall length L is greater than or equal to <NUM> and less than or equal to <NUM>. In some examples, the overall length L is separately <NUM>, <NUM>, or <NUM>.

The ratio of the first length T1 between the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> to the overall length L is greater than or equal to <NUM>. In an example, the ratio of the first length T1 to the overall length L is greater than or equal to <NUM>. In an example, the ratio of the first length T1 to the overall length L is about <NUM>.

A fourth distance L4 is defined as the minimum distance from the output mechanism <NUM> at the frontmost end of the power tool <NUM> to the battery pack <NUM>. The ratio of the first length T1 between the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> to the fourth distance L4 is greater than or equal to <NUM>. In an example, the ratio of the first length T1 to the fourth distance L4 is greater than or equal to <NUM>. In an example, the ratio of the first length T1 to the fourth distance L4 is about <NUM>.

It is to be noted that if the battery pack <NUM> is inserted into the battery pack coupling portion <NUM> in a direction oblique to the motor axis <NUM>, the intersection of the battery pack <NUM> and the motor axis <NUM> is set as the "front side" of the battery pack <NUM>, and the distance from the frontmost end of the power tool <NUM> (excluding the work attachments such as the blade and the saw blade) to the intersection of the battery pack <NUM> and the motor axis <NUM> is the fourth distance L4.

As shown in <FIG>, in an example, a first shock absorbing center C1a of a first shock absorbing assembly 710a and a second shock absorbing center C2a of a second shock absorbing assembly 720a are not arranged along a straight line parallel to the motor axis <NUM> in the front and rear direction. That is to say, the line connecting the first shock absorbing center C1a and the second shock absorbing center C2a forms a non-zero included angle α with the motor axis <NUM>. In this case, the first length T1, the third length T3, and the second distance L2 are all measured as shown in <FIG>.

If two shock absorbers <NUM> in the same shock absorbing assembly <NUM> are disposed on the upper and lower sides of the motor axis <NUM>, first, the shock absorbing center of the shock absorbing assembly <NUM> is found according to the manner disclosed in <FIG>; if the shock absorbing center is not on the motor axis <NUM>, the projection of the shock absorbing center on the motor axis <NUM> is made.

Generally, the first shock absorbing assembly <NUM> includes one or two shock absorbers <NUM>, and the second shock absorbing assembly <NUM> also includes one or two shock absorbers <NUM>. Through creative work, calculation, and reasoning, the applicant found that if the number of shock absorbers <NUM> is not changed, the distance relationship between two shock absorbing assemblies is adjusted to significantly improve the shock absorbing effect and verified the preceding inventive discovery of the inventor through simulations and experiments. In the technical method disclosed in the present application, the position and distance relationship between the first shock absorbing assembly <NUM> and the second shock absorbing assembly <NUM> is limited so that the shock absorbing effect of the shock absorbing assembly <NUM> is better, and the vibration of the whole machine is smaller. In this manner, the operator is not easy to be fatigued when holding the whole machine for a long time, and the noise generated by vibration is also reduced.

<FIG> disclose the mounting assembly <NUM> by which various work attachments <NUM> may be mounted to the power tool <NUM>. The mounting assembly <NUM> includes a first element <NUM> and a clamping piece <NUM>. A connecting pin <NUM> connects the first element <NUM> to two clamping pieces <NUM>. The up-and-down movement of the first element <NUM> drives the clamping piece <NUM> to be opened and closed.

As shown in <FIG>, the first element <NUM> includes a first protruding portion <NUM>, a second protruding portion <NUM>, and a connecting portion <NUM>, where the first protruding portion <NUM> extends along a first straight line <NUM>, the second protruding portion <NUM> extends along a second straight line <NUM>, and the first straight line <NUM> is basically parallel to the second straight line <NUM>. The connecting portion <NUM> connects the first protruding portion <NUM> to the second protruding portion <NUM> along a direction of a third straight line <NUM>, and the third straight line <NUM> is perpendicular to the first straight line <NUM> and the second straight line <NUM>. The first protruding portion <NUM>, the second protruding portion <NUM>, and the connecting portion <NUM> form a U shape.

A second middle plane <NUM> is provided along the geometric center of the connecting portion <NUM> and perpendicular to the connecting portion <NUM>, the first protruding portion <NUM> and the second protruding portion <NUM> are separately located on two sides of the second middle plane <NUM>, and the first protruding portion <NUM> and the second protruding portion <NUM> are not completely symmetrical about the middle plane. In this example, the first protruding portion <NUM> has a first connecting hole <NUM>, and the second protruding portion <NUM> has a second connecting hole <NUM>. The first protruding portion <NUM> has an opening <NUM>, and the second protruding portion <NUM> has no opening at a position symmetrical to the opening <NUM>. It is to be noted that the opening <NUM> here is not used for connecting any component.

The structure and material of the first element <NUM> are similar to those of a "tuning fork". The tuning fork is a musical instrument. Here is a brief explanation of the tuning fork: the tuning fork is made of elastic metal, is a two-pronged fork with a handle at the end, and is shaped like the Latin letter U. The tuning fork has a constant resonant frequency and vibrates when being struck. After the initial overtone series fades out, the sound from the tuning fork has a constant pitch.

Since an end of the first element <NUM> forms a U-shaped structure, that is, a "tuning fork" structure, to avoid the noise caused by the vibration of the first element <NUM>, the opening <NUM> is used for breaking the original "tuning fork" structure so that the first protruding portion <NUM> and the second protruding portion <NUM> are not symmetrical about the second middle plane <NUM>, so as to avoid the noise caused by the formation of the "tuning fork" structure. In some examples, in addition to punching a hole, rids may be provided on the first protruding portion <NUM> and/or the second protruding portion <NUM> so that the first protruding portion <NUM> is not symmetrical to the second protruding portion <NUM>.

In addition, a U-shaped structure is also formed on a side of the oscillating member <NUM>. If the oscillating member <NUM> is configured to be an asymmetric structure, the noise when the oscillating member <NUM> oscillates can also be reduced.

The heat dissipation mechanism <NUM> is described below. In conjunction with <FIG> and <FIG>, the fan <NUM> is disposed on a side of the motor <NUM> and driven by the motor shaft <NUM> to rotate.

As shown in <FIG>, the heat dissipation mechanism <NUM> further includes an air guide hood <NUM>, and the minimum distance M between the fan <NUM> and the air guide hood <NUM> along a radial direction perpendicular to the motor axis <NUM> is greater than or equal to <NUM> and less than or equal to <NUM>.

As shown in <FIG>, the fan <NUM> is a centrifugal fan, and alternating current is used as an energy source of the oscillating power tool involved in the present application. The fan <NUM> includes arc-shaped fan blades <NUM>, a base plate <NUM>, and a support portion <NUM>. The fan blades <NUM> are partially integrated into the base plate <NUM> and partially exposed from the base plate <NUM>. The fan blade includes a root <NUM> and a tail <NUM>. The root <NUM> of the fan <NUM> is connected to the support portion <NUM>. The middle opening of the support portion <NUM> is used for the motor shaft <NUM> to penetrate through. The airflow flows out along the tail <NUM> of the fan blade <NUM>. A circle formed by connecting tails <NUM> of multiple fan blades <NUM> is defined as an outer circle <NUM>. It is to be noted that the outer circle <NUM> here is not an actual component, but an auxiliary line drawn by the fan blades <NUM>.

The diameter of the base plate <NUM> is a first diameter d1, and the diameter of the outer circle <NUM> is a second diameter d2. The ratio of the second diameter d2 to the first diameter d1 is greater than or equal to <NUM> and less than or equal to <NUM>.

When the motor <NUM> is an inner rotor motor, the ratio of the second diameter d2 of the outer circle <NUM> to the outer diameter of the inner rotor motor is greater than or equal to <NUM> and less than or equal to <NUM>.

The diameter of the support portion <NUM> of the fan <NUM> is a third diameter d3. When the motor <NUM> is an inner rotor motor, the ratio of the third diameter d3 to the rotor diameter is greater than or equal to <NUM> and less than or equal to <NUM>.

As shown in <FIG>, the airflow flows out along the tail <NUM> of the fan blade <NUM> at a speed v, and the included angle β between the tangent to the outer circle <NUM> at the tail <NUM> of the fan blade <NUM> and the speed v at which the airflow flows out from the tail <NUM> is greater than or equal to <NUM> degrees and less than or equal to <NUM> degrees.

In the existing art, the fan blade <NUM> is generally configured to be linear. Through creative work, calculation, and reasoning, the applicant found that the arc-shaped fan blades have a better noise reduction effect than the linear fan blades and verified the preceding inventive discovery of the inventor through simulations and experiments The arc-shaped fan blades <NUM> are conducive to reducing the noise generated by the fan <NUM> during rotation. Further, the specific structural feature such as the distance at which the tail <NUM> of the fan blade <NUM> protrudes from the base plate <NUM> is adjusted, and the minimum distance between the fan <NUM> and the air guide hood <NUM> is limited so that the noise generated when the fan <NUM> rotates to generate the airflow is effectively reduced, the noise reduction and the heat dissipation capacity of the fan <NUM> are balanced, and the following is avoided: while the noise of the fan <NUM> is reduced, the mass flow rate of the fan <NUM> is reduced and the heat dissipation effect of the fan <NUM> is reduced.

In the present application, the maximum rotational speed of the motor <NUM> is greater than or equal to <NUM> RPM and less than or equal to <NUM> RPM, and the maximum oscillation angle of the work attachment <NUM> is greater than or equal to <NUM> degrees and less than or equal to <NUM> degrees. In an example, for the hand-held oscillating power tool, such as the oscillating multifunctional tool, the maximum rotational speed of the motor <NUM> is about <NUM> RPM, and the maximum oscillation angle of the attachment <NUM> is <NUM> degrees. The oscillation angle here refers to the angle at which the output shaft <NUM> is driven by the oscillating member <NUM> to oscillate. The power tool <NUM> is improved in the preceding multiple aspects so that the vibration and noise of the whole machine of the power tool <NUM> are significantly improved, and the noise value of the power tool <NUM> in a load-free state can be as low as <NUM> decibels. Such a noise value has a huge advantage for the oscillating power tool and greatly optimizes the user experience.

<FIG> provide an oscillating power tool. The oscillating power tool has a detachable work attachment <NUM> and can drive the work attachment <NUM> to oscillate left and right in a plane, so as to cut and machine the processing materials.

As shown in <FIG>, the oscillating power tool includes the housing <NUM>, a clamping mechanism <NUM>, a power mechanism <NUM>, and the work attachment <NUM>. The housing <NUM> is the main mounting component of the oscillating power tool, and a cavity for mounting the clamping mechanism <NUM> and the power mechanism <NUM> is formed inside the housing <NUM>. The power mechanism <NUM> is used for outputting the oscillation motion, and the oscillation motion is transmitted through the clamping mechanism <NUM> so that the work attachment <NUM> oscillates in a certain plane. Part of the structure of the clamping mechanism <NUM> is mounted in the housing <NUM>. The clamping mechanism <NUM> includes a first bearing <NUM>, a support sleeve <NUM>, an output shaft sleeve <NUM>, and a locking rod <NUM>, where the first bearing <NUM> is sleeved on the support sleeve <NUM>, the support sleeve <NUM> is sleeved on the output shaft sleeve <NUM>, and the output shaft sleeve <NUM> is sleeved on the locking rod <NUM>. The first bearing <NUM> is fixed in the housing <NUM>, the support sleeve <NUM> penetrates through the first bearing <NUM>, the output shaft sleeve <NUM> is disposed in the support sleeve <NUM>, and the output shaft sleeve <NUM> is rotatably sleeved outside the locking rod <NUM>. The locking rod <NUM> can move along a first straight line b, a clamping space whose size is adjustable is formed between the first end of the locking rod <NUM> and the first end of the output shaft sleeve <NUM>, the output shaft sleeve <NUM> is drivingly connected to the power mechanism <NUM>, the second end of the output shaft sleeve <NUM> extends into the support sleeve <NUM> and is connected to the support sleeve <NUM>, and the second end of the locking rod <NUM> extends into the support sleeve <NUM>. The work attachment <NUM> is detachably connected in the clamping space, and the work attachment <NUM> can be driven by the power mechanism <NUM> to oscillate along with the output shaft sleeve <NUM>.

It is to be noted that, in some examples, when the oscillating power tool is in the working state, the first straight line b is a vertical line. In this case, the first end of the locking rod <NUM> and the first end of the output shaft sleeve <NUM> are both bottom ends, and the second end of the locking rod <NUM> and the second end of the output shaft sleeve <NUM> are both top ends.

Compared with the oscillating power tool in the existing art, the overall structure of the clamping mechanism <NUM> of the oscillating power tool provided in the present application is simple, and fewer components are used, so the manufacturing cost is lower. Moreover, since the output shaft sleeve <NUM> that drives the work attachment <NUM> to rotate and the locking rod <NUM> used for forming the clamping space and changing the size of the clamping space are supported and limited by the first bearing <NUM> and the support sleeve <NUM>, the stability of the clamping mechanism <NUM> in the housing <NUM> is relatively high, the vibration generated by the clamping mechanism <NUM> in the working process is relatively small, and the user experience is relatively high.

As shown in <FIG>, the overall housing <NUM> is cylindrical, the rear end of the housing <NUM> forms a grip, and the user may hold the grip to operate the oscillating power tool. Optionally, an anti-slip pattern is provided on the grip. The front end of the housing <NUM> forms a mounting portion, and the clamping mechanism <NUM> vertically penetrates the mounting portion. Both the bottom end of the locking rod <NUM> and the bottom end of the output shaft sleeve <NUM> protrude from the bottom of the mounting portion so that the work attachment <NUM> can be detachably connected in the clamping space formed by the locking rod <NUM> and the output shaft sleeve <NUM>. When the cutting operation is required, the work attachment <NUM> is mounted at the bottom of the clamping mechanism <NUM>. After the cutting operation is completed, the work attachment <NUM> may be disassembled from the clamping mechanism <NUM> for storage.

As shown in <FIG>, the power mechanism <NUM> is disposed in the grip of the housing <NUM>. After the clamping mechanism <NUM> clamps the work attachment <NUM>, the power mechanism <NUM> works to drive the work attachment <NUM> to oscillate in a plane perpendicular to the first straight line b. In this example, the plane is a horizontal plane. With continued reference to <FIG> and <FIG>, the power mechanism <NUM> includes an electric motor <NUM>, a ball sleeve <NUM>, and an oscillating member <NUM>, where the electric motor <NUM> is horizontally disposed inside the housing <NUM>, the motor shaft of the electric motor <NUM> is horizontally disposed, the axis of the motor shaft of the electric motor <NUM> is the second straight line, the ball sleeve <NUM> is connected to the motor shaft of the electric motor <NUM>, and the eccentricity of the ball sleeve <NUM> is determined according to the oscillation angle that the work attachment <NUM> needs to achieve and is not limited here. In some examples, the ball sleeve <NUM> is an eccentric bearing. In some examples, the oscillating member <NUM> is a type of shift fork.

To achieve the connection between the ball sleeve <NUM> and the output shaft sleeve <NUM>, the power mechanism <NUM> further includes the oscillating member <NUM>, where the oscillating member <NUM> is connected between the ball sleeve <NUM> and the clamping mechanism <NUM> so that the rotation of the ball sleeve <NUM> is converted into the oscillation of the work attachment <NUM> in the horizontal plane. Specifically, in this example, a clamping portion is disposed at an end of the oscillating member <NUM>, and a first clamping groove is disposed on the clamping portion. Optionally, the first clamping groove is a U-shaped groove, the opening direction of the U-shaped groove is horizontal, and the ball sleeve <NUM> is disposed in the first clamping groove and can rotate freely in the first clamping groove. The other end of the oscillating member <NUM> is connected to the output shaft sleeve <NUM>. Optionally, a sleeve hole is provided at the other end of the oscillating member <NUM>, and the output shaft sleeve <NUM> is located in the sleeve hole, where the output shaft sleeve <NUM> has an interference fit with the oscillating member <NUM> or the output shaft sleeve <NUM> is fixedly connected to the oscillating member <NUM>, so as to achieve synchronous movement.

When the ball sleeve <NUM> is driven by the electric motor <NUM> to rotate around the motor shaft of the electric motor <NUM>, the contact point of the ball sleeve <NUM> and the clamping portion of the oscillating member <NUM> moves left and right in the horizontal plane, and the other end of the oscillating member <NUM> oscillates accordingly. When the oscillating member <NUM> is driven by the ball sleeve <NUM> to oscillate in the horizontal plane, the output shaft sleeve <NUM> can oscillate in the horizontal plane.

To form a relatively large clamping space, as shown in <FIG> and <FIG>, a first clamping portion <NUM> is disposed at the bottom end of the locking rod <NUM>, a second clamping portion <NUM> is disposed at the bottom end of the output shaft sleeve <NUM>, and a clamping space is formed between the first clamping portion <NUM> and the second clamping portion <NUM>. Optionally, the first clamping portion <NUM> is a disk structure vertically disposed at the bottom end of the locking rod <NUM>, the second clamping portion <NUM> is a disk structure vertically disposed at the bottom of the output shaft sleeve <NUM>, and an annular clamping space is formed between the first clamping portion <NUM> and the second clamping portion <NUM>.

When the locking rod <NUM> moves downward, the first clamping portion <NUM> moves downward synchronously, and since the height of the output shaft sleeve <NUM> and the second clamping portion <NUM> above the output shaft sleeve <NUM> in the vertical direction remains unchanged, the width of the clamping space between the first clamping portion <NUM> and the second clamping portion <NUM> gradually increases as shown in the state in <FIG>. At this time, the connection end of the work attachment <NUM> may be disposed in the clamping space. When the locking rod <NUM> moves upward, the first clamping portion <NUM> moves upward synchronously, and the width of the clamping space between the first clamping portion <NUM> and the second clamping portion <NUM> gradually decreases, thereby clamping the work attachment <NUM> in the clamping space as shown in the state in <FIG>.

In some examples, as shown in <FIG>, limiting teeth <NUM> are provided on the clamping surface of the first clamping portion <NUM>, limiting holes <NUM> are provided on the work attachment <NUM>, and the limiting teeth <NUM> can engage with the limiting holes <NUM> so that when the output shaft sleeve <NUM> is driven by the oscillating member <NUM> to rotate, the work attachment <NUM> rotates synchronously.

Optionally, in some examples, the limiting teeth <NUM>, the first clamping portion <NUM>, and the output shaft sleeve <NUM> are integrally formed so that no additional connection structure is needed to achieve the connection between the limiting teeth <NUM>, the first clamping portion <NUM>, and the output shaft sleeve <NUM>, thereby greatly improving the structural compactness and strength and reducing the overall dimension and connection costs.

Further, multiple limiting teeth <NUM> are provided on the first clamping portion <NUM>, the multiple limiting teeth <NUM> are arranged radially on the first clamping portion <NUM>, multiple limiting holes <NUM> are provided on the work attachment <NUM>, and the multiple limiting holes <NUM> are arranged radially on the work attachment <NUM> and disposed in one-to-one correspondence with the multiple limiting teeth <NUM>, thereby improving the limiting effect. Of course, in other examples, the positions of the limiting teeth <NUM> and the limiting holes <NUM> may be interchanged, that is, the limiting teeth <NUM> are provided on the work attachment <NUM>, and the limiting holes <NUM> are provided on the first clamping portion <NUM>.

With continued reference to <FIG>, the locking rod <NUM> further includes a locking rod body <NUM>, and the first clamping portion <NUM> is disposed at the bottom end of the locking rod body <NUM>. In some examples, an annular clamping groove is provided at the bottom end of the locking rod body <NUM>, and the first clamping portion <NUM> is mounted in the annular clamping groove so that the first clamping portion <NUM> is detachably connected to the locking rod body <NUM>. In some examples, the locking rod body <NUM> and the first clamping portion <NUM> are integrally formed so that no additional connection structure is needed to achieve the connection between the locking rod body <NUM> and the first clamping portion <NUM>, thereby greatly improving the structural compactness and strength and reducing the overall dimension and connection costs.

With continued reference to <FIG>, the output shaft sleeve <NUM> further includes a sleeve body <NUM>, and the second clamping portion <NUM> is connected to the bottom of the sleeve body <NUM>. In some examples, the sleeve body <NUM> and the second clamping portion <NUM> are integrally formed so that no additional connection structure is needed to achieve the connection between the sleeve body <NUM> and the second clamping portion <NUM>, thereby greatly improving the structural compactness and strength and reducing the overall dimension and connection costs.

With continued reference to <FIG>, the clamping mechanism <NUM> further includes a second bearing <NUM>, the second bearing <NUM> is disposed in the housing <NUM>, the length of the output shaft sleeve <NUM> is less than the length of the locking rod <NUM>, the output shaft sleeve <NUM> is rotatably disposed inside the housing <NUM> and sleeved on the middle and lower part of the locking rod <NUM>, and the output shaft sleeve <NUM> penetrates through the second bearing <NUM> so that the output shaft sleeve <NUM> can rotate inside the housing <NUM>.

To allow the user to easily adjust the size of the clamping space and ensure that the adjustment process has high stability, as shown in <FIG>, the clamping mechanism <NUM> further includes an operating member <NUM>, a pressing rod <NUM>, and a pressing block <NUM>. The operating member <NUM> is rotatably connected outside the housing <NUM>, the pressing rod <NUM> is movably disposed on the housing <NUM>, the top end of the pressing rod <NUM> abuts against a cam portion <NUM> of the operating member <NUM>, the pressing block <NUM> is movably disposed in the support sleeve <NUM>, a through hole penetrates through the pressing block <NUM>, and the second end of the locking rod <NUM> is disposed in the through hole and faces the bottom end of the pressing rod <NUM>.

When the operating member <NUM> is driven by an external force to rotate around the third straight line, the operating member <NUM> can drive the pressing rod <NUM> to move vertically downward until the pressing rod <NUM> abuts against the pressing block <NUM>, the operating member <NUM> continues rotating, the pressing rod <NUM> and the pressing block <NUM> moves downward synchronously, the top end of the locking rod <NUM> gradually exposes the pressing block <NUM>, and the pressing rod <NUM> can abut against the top end of the locking rod <NUM>. At this time, the operating member <NUM> continues rotating, and the pressing rod <NUM>, the pressing block <NUM>, and the locking rod <NUM> move downward synchronously so that the bottom end of the pressing rod <NUM> protrudes from the bottom end of the output shaft sleeve <NUM>, thereby increasing the clamping space.

It is to be noted that, in some examples, when the oscillating power tool is in the working state, the third straight line and the second straight line are both horizontal lines, the third straight line may be parallel to, perpendicular to, or at any included angle with the second straight line, and the third straight line is perpendicular to the first straight line b.

In some examples, the operating member <NUM> includes the cam portion <NUM> and a handle portion <NUM>, where the cam portion <NUM> is in an "ellipse-like" shape, the bottom surface of the cam portion <NUM> abuts against the top end of the pressing rod <NUM>, the handle portion <NUM> is in the shape of a strip, and the user may apply torque to the handle portion <NUM> to drive the cam portion <NUM> to rotate around a rotating shaft. When the operating member <NUM> rotates around the rotating shaft, the height of the bottom surface of the cam portion <NUM> changes so that the pressing rod <NUM> abutting against the cam portion <NUM> can move vertically.

In some examples, the pressing rod <NUM> includes a first rod portion <NUM>, an abutting portion <NUM>, and a second rod portion <NUM> connected in sequence, where the dimension of the abutting portion <NUM> is greater than the dimension of the second rod portion <NUM>, the first rod portion <NUM> abuts against the cam portion <NUM>, the second rod portion <NUM> extends into the through hole and abuts against the locking rod <NUM>, and the lower end surface of the abutting portion <NUM> abuts against the upper end surface of the pressing block <NUM>, thereby improving the transmission stability.

To reduce the clamping space quickly, the clamping mechanism <NUM> further includes a reset structure, where the reset structure is in a compressed state when the locking rod <NUM> moves downward relative to the output shaft sleeve <NUM>. When the user rotates the operating member <NUM> in a reverse direction, the restoring force provided by the reset structure can make the pressing rod <NUM>, the pressing block <NUM>, and the locking rod <NUM> move rapidly toward the direction that the clamping space is reduced so that the locking rod <NUM> can be quickly restored from the state shown in <FIG> to the state shown in <FIG>.

In some examples, the reset structure includes a first elastic member <NUM> and a second elastic member <NUM> disposed in the support sleeve <NUM>, where the first elastic member <NUM> has the tendency to make the pressing block <NUM> drive the pressing rod <NUM> to move away from the clamping space, and the second elastic member <NUM> has the tendency to make the pressing rod <NUM> drive the locking rod <NUM> to move in the direction that the clamping space is reduced. The two elastic members are provided so that after the work attachment <NUM> is replaced or mounted, all the pressing block <NUM>, the pressing rod <NUM>, and the locking rod <NUM> can be quickly reset to the position at which the work attachment <NUM> is locked. Compared with the case where one elastic member is provided for each of the pressing block <NUM>, the pressing rod <NUM>, and the locking rod <NUM>, in the example of the present application, only the first elastic member <NUM> and the second elastic member <NUM> are provided so that the structure is simpler.

The first elastic member <NUM> transmits a force to make the clamping mechanism <NUM> switch between a clamping state and an unlocking state, and the state change of the first elastic member <NUM> changes the size of the clamping space formed by the clamping mechanism <NUM> and used for clamping the work attachment <NUM>.

In some examples, as shown in the figure, the first elastic member <NUM> is a first coil spring, the first coil spring is sleeved on the outside of the output shaft sleeve <NUM> and the pressing block <NUM>, an end of the first coil spring is connected to the pressing block <NUM>, and the other end of the first coil spring is fixed relative to the output shaft sleeve <NUM>. The second elastic member <NUM> is a second coil spring, the second coil spring is located in the through hole, an end of the second coil spring is connected to the pressing rod <NUM>, and the other end of the second coil spring is connected to the locking rod <NUM>. Of course, in other examples, the first elastic member <NUM> and the second elastic member <NUM> may also be elastic structures such as spring sheets and memory alloy sheets in addition to coil springs.

In some examples, the other end of the first coil spring is fixedly connected to the output shaft sleeve <NUM>. In some other examples, to improve the structural compactness of the entire clamping mechanism <NUM>, the height of the clamping mechanism <NUM> in the vertical direction is reduced, the top end of the oscillating member <NUM> abuts against the bottom surface of the output shaft sleeve <NUM>, an annular mounting groove is provided on the oscillating member <NUM>, and the other end of the first coil spring penetrates through the output shaft sleeve <NUM> and is connected in the annular mounting groove.

In some examples, a limiting groove is disposed on one of the outer wall surface of the pressing block <NUM> and the inner wall surface of the support sleeve <NUM>, a limiting block <NUM> is disposed on the other one of the outer wall surface of the pressing block <NUM> and the inner wall surface of the support sleeve <NUM>, and the limiting block <NUM> is slidably connected to the limiting groove.

The work attachment <NUM> has a locked state (that is, the state shown in <FIG>) in which the work attachment <NUM> is locked in the clamping space. In some examples, when the work attachment <NUM> is in the locked state, the spring force of the first coil spring is <NUM> N to <NUM> N, and the length of the first coil spring is <NUM> to <NUM>. In a specific example, when the work attachment <NUM> is in the locked state, the spring force of the first coil spring is <NUM> N, and the length of the first coil spring is <NUM>.

In some examples, a height M1 of the support sleeve <NUM> is greater than or equal to <NUM> and less than or equal to <NUM>. Optionally, the height M1 of the support sleeve <NUM> is greater than or equal to <NUM> and less than or equal to <NUM>. In some specific examples, M1 may be <NUM>, <NUM>, or <NUM>.

In some examples, the oscillating power tool further includes a transmission box <NUM>, where the transmission box <NUM> is disposed in the housing <NUM> and used for mounting the clamping mechanism <NUM>. The ratio a of a height M2 of the transmission box <NUM> to the height M1 of the support sleeve <NUM> is greater than or equal to <NUM> and less than or equal to <NUM>. In some specific examples, a maybe <NUM>, <NUM>, <NUM>, or <NUM>.

The present application further provides an oscillating power tool. The oscillating power tool includes the housing <NUM>, the clamping mechanism <NUM>, and the power mechanism <NUM>. The clamping mechanism <NUM> is at least partially disposed in the housing <NUM> and forms a clamping space in which the work attachment <NUM> is clamped. The power mechanism <NUM> includes the electric motor <NUM> and the oscillating member <NUM>. The electric motor <NUM> can drive the oscillating member <NUM> to move. The oscillating member <NUM> drives the work attachment <NUM> to oscillate around the first straight line b. The clamping mechanism <NUM> includes the first bearing <NUM> and the second bearing <NUM>. The first bearing <NUM> is disposed on the upper side of the oscillating member <NUM>, and the second bearing <NUM> is disposed on the lower side of the oscillating member <NUM>. The clamping mechanism <NUM> further includes the output shaft sleeve <NUM>, the oscillating member <NUM> drives the output shaft sleeve <NUM> to rotate, and the work attachment <NUM> moves along with the output shaft sleeve <NUM>. The clamping mechanism <NUM> further includes the support sleeve <NUM> connected to an end of the output shaft sleeve <NUM>, the second bearing <NUM> supports the output shaft sleeve <NUM>, the clamping mechanism <NUM> further includes the first elastic member <NUM> for transmitting the force to make the clamping mechanism <NUM> switch between the clamping state and the unlocking state, and the first elastic member <NUM> is at least partially disposed outside the output shaft sleeve <NUM>.

The working process of the oscillating power tool includes a mounting process of the work attachment <NUM> and an oscillating process of the work attachment <NUM>.

The mounting process of the work attachment <NUM> is specifically as follows: first, the operating member <NUM> is rotated to the state shown in <FIG>; at this time, the clamping space between the first clamping portion <NUM> and the second clamping portion <NUM> is the largest; then, an end of the work attachment <NUM> at which a second clamping groove <NUM> is provided is inserted between the first clamping portion <NUM> and the second clamping portion <NUM>, and the second clamping groove <NUM> is clamped to the locking rod <NUM>; finally, the operating member <NUM> is rotated in the reverse direction to the state shown in <FIG>; at this time, the locking rod <NUM> is driven by the reset structure to be automatically reset, the clamping space between the first clamping portion <NUM> and the second clamping portion <NUM> becomes smaller, and the work attachment <NUM> is clamped in the clamping space so that the work attachment <NUM> and the oscillating power tool are assembled.

The oscillating process of the work attachment <NUM> is specifically as follows: the electric motor <NUM> is powered on, the motor shaft of the electric motor <NUM> rotates and drives the ball sleeve <NUM> to rotate, and the oscillating member <NUM> is driven by the ball sleeve <NUM> to oscillate left and right in the horizontal plane and drives the output shaft sleeve <NUM> to rotate left and right around the axis; since the limiting teeth <NUM> engage with the limiting holes <NUM>, the locking rod <NUM> can rotate synchronously with the output shaft sleeve <NUM> so that the work attachment <NUM> oscillates left and right in the horizontal plane, and thus the cutting end of the work attachment <NUM> can perform the cutting operation.

Compared with the existing oscillating power tool, the oscillating power tool provided in the present application has the advantages described below. First, the vibration of the whole machine is reduced, the moment of inertia is reduced from about <NUM>·mm<NUM> commonly in the existing products to <NUM>·mm<NUM> or less, and the moment of inertia is reduced by about <NUM>%. Second, the performance of the whole machine is improved. When the oscillation angle of the work attachment <NUM> is <NUM> degrees and the rotational speed of the electric motor <NUM> is as high as <NUM> RPM, the oscillating power tool can still satisfy the requirements for life and quality. As for the oscillating power tool in which the solution is not adopted, the vibration when the rotational speed of the electric motor <NUM> reaches <NUM> RPM is very large; if the rotational speed of the electric motor <NUM> continues increasing, the oscillating power tool will be damaged, so the oscillating power tool cannot satisfy the requirements for life and quality. Third, the cutting efficiency is improved. When the oscillating power tool is equipped with the work attachment <NUM> for vertical slotting, the cutting time can be shortened from more than <NUM> seconds to less than <NUM> seconds. Fourth, the cost is reduced by about <NUM>% than the cost of the clamping mechanism <NUM> of the original oscillating power tool. Fifth, the volume and weight of the whole machine are reduced. Sixth, the operation of the user is labor-saving, and it is not easy to pinch hands.

Claim 1:
A power tool (<NUM>), comprising:
a housing (<NUM>);
a motor (<NUM>) rotatable around a motor axis (<NUM>);
a ball sleeve (<NUM>) sleeved on a motor shaft (<NUM>) and driven by the motor shaft (<NUM>) to move;
an oscillating member (<NUM>) driven by the ball sleeve (<NUM>) to oscillate; and
an output shaft (<NUM>) driven by the oscillating member (<NUM>) to rotate around an output shaft axis (<NUM>), wherein the oscillating member (<NUM>) comprises a mounting portion (<NUM>) sleeved on the output shaft (<NUM>);
wherein a first bearing assembly (<NUM>) and a second bearing assembly (<NUM>) are sleeved on the output shaft (<NUM>), wherein the first bearing assembly (<NUM>) is located on an upper side of the mounting portion (<NUM>), and the second bearing assembly (<NUM>) is located on a lower side of the mounting portion (<NUM>);
the oscillating member (<NUM>) and the ball sleeve (<NUM>) are engaged in an engagement region (<NUM>) on the oscillating member (<NUM>), and a geometric center of the engagement region (<NUM>) is defined as an engagement center (<NUM>);
a first plane (<NUM>) bisects the first bearing assembly (<NUM>) along a direction of the output shaft axis (<NUM>), and the first plane (<NUM>) is perpendicular to the output shaft axis (<NUM>); a second plane (<NUM>) bisects the second bearing assembly (<NUM>) along the direction of the output shaft axis (<NUM>), and the second plane (<NUM>) is perpendicular to the output shaft axis (<NUM>); and
a height from the engagement center (<NUM>) to the first plane (<NUM>) is a first height (H1), a height from the engagement center (<NUM>) to the second plane (<NUM>) is a second height (H2), and a ratio H1/H2 of the first height (H1) to the second height (H2) is greater than or equal to <NUM> and less than or equal to <NUM>; characterized in that
a distance from the engagement center (<NUM>) to the output shaft axis (<NUM>) is a first radius (R1), wherein the first radius (R1) is less than or equal to <NUM>.