Patent Description:
In a traditional string trimmer, the motor in the driving assembly is usually housed in a connecting base. The connecting base is provided with a hole for the output shaft to pass through. The output shaft passes through the hole from the top of the connecting base and is connected with the air extraction device at the bottom of the connecting base so that the output shaft can drive the air extraction device to rotate to reduce the temperature of the motor. However, such an assembly method results in the connecting base between the motor and the ventilation device, which enables the distance between the motor and the air extraction device to be larger and weakens the heat dissipation effect of the air extraction device on the motor.

In view of this, it is indeed necessary to improve the drive assemblies to solve the above problems.

A vegetation trimmer is disclosed in <CIT>, having a motor with a motor output shaft, a cutting head for cutting vegetation, and a gear mechanism for transmitting power from said motor output shaft to the cutting head.

The present invention provides a driving assembly and a string trimmer to solve problems of a large distance between a motor and an air extraction device and poor heat dissipation effect in a conventional driving assembly.

The present invention provides a driving assembly, which includes a connecting base and a driving device. The driving device includes a driving body, a mounting part and an output shaft. The output shaft includes an input section and an output section. The output shaft includes an input section and an output section, the input section is housed in the driving body and extends outward from the driving body to form the output section, the mounting part is arranged on a side of the driving body close to the output section, a receiving hole is arranged on the connecting base, and a side of the driving body away from the output section passes through the receiving hole and connects a bottom of the connecting base with the mounting part.

In an embodiment of the present invention, the connecting base includes a connecting part, the receiving hole is arranged at a center position of the connecting part, and the mounting part is fixedly connected with the connecting part.

In an embodiment of the present invention, the driving assembly includes a locking component, the connecting part is provided with a first through hole, the mounting part is correspondingly provided with a mounting hole, and the locking component passes through the first through hole and the mounting hole to connect the driving device and the connecting base.

In an embodiment of the present invention, the mounting part includes a mounting protrusion, a bottom of the connecting part is concave inward to form a clamping groove corresponding to the mounting protrusion, and at least part of the mounting protrusion is housed in the clamping groove.

In an embodiment of the present invention, the driving assembly includes an air extraction device connected with the output section, and when the driving body drives the output shaft, the air extraction device rotates synchronously with the output shaft.

In an embodiment of the present invention, the driving device includes a bearing arranged between the mounting part and the output shaft, a side of the air extraction device close to the driving body is provided with an abutting end extending along a direction toward the driving body, and the abutting end is in contact with the bearing.

In an embodiment of the present invention, the air extraction device includes a fan blade, and a distance between the fan blade and the mounting part in an extension direction of the output shaft is <NUM>.

In an embodiment of the present invention, the output shaft is provided with an anti-slip surface, the air extraction device includes a transmission hole coupled with the output shaft, a transmission surface is provided in the transmission hole, the output shaft is housed in the transmission hole and the anti-slip surface is in fitted with the transmission surface to enable the output shaft and the air extraction device to rotate synchronously.

In an embodiment of the present invention, an end of the output section away from the driving body is provided with a first fixing end, the driving assembly further includes a cutting device, the cutting device is provided with a second fixing end and a shaft hole, the output shaft passes through the shaft hole and connects the first fixing end with the second fixing end to limit the air extraction device between the driving device and the cutting device.

The present invention further provides a garden tool, which includes a battery assembly, a connecting assembly and a driving assembly. the connecting assembly connects the battery assembly and the driving assembly, the battery assembly is configured to supply power to the driving assembly, the driving assembly includes a connecting base and a driving device, the driving device includes a driving body, a mounting part and an output shaft, the output shaft includes an input section and an output section, the input section is housed in the driving body and extends outward from the driving body to form the output section, the mounting part is arranged on a side of the driving body close to the output section, a receiving hole is arranged on the connecting base, and a side of the driving body away from the output section passes through the receiving hole and connects a bottom of the connecting base with the mounting part.

In an embodiment of the present invention, the garden tool is a string trimmer or a hedge trimmer.

The beneficial effects of the present invention are: in the driving assembly of the present invention, the receiving hole matching the driving body is arranged on the connecting base, the side of the driving body away from the output section passes through the receiving hole, and the driving body is housed in the receiving hole, so that there is no connecting block between an air extraction device and the driving body, which reduces a distance between the air extraction device and the driving body, improves a heat dissipation effect of the air extraction device on the driving body, and an overall power and performance of the driving assembly.

In order to enable the purpose, technical solutions and advantages of the present invention to be clearer, the present invention will be described in detail below with reference to drawings and specific embodiments.

Please refer to <FIG>. The present invention provides a garden tool. The garden tool is a string trimmer <NUM> or a hedge trimmer, which is used for trimming vegetation. In this embodiment, the string trimmer <NUM> is taken as an example for description, but it should not be limited to this. Specifically, the string trimmer <NUM> includes a battery assembly <NUM>, a driving assembly <NUM>, and a connecting assembly <NUM> that connects the battery assembly <NUM> and the driving assembly <NUM>. The battery assembly <NUM> supplies power to the driving assembly <NUM>, which enables the driving assembly <NUM> to rotate, Wherein, the connecting assembly <NUM> includes a control part <NUM>, a connecting rod <NUM> and a passage <NUM> opened inside the connecting rod <NUM>. Two ends of the connecting rod <NUM> are respectively connected with the battery assembly <NUM> and the driving assembly <NUM>. The control part <NUM> is located in a middle position of the connecting rod <NUM>. An operator controls a mowing speed and movement direction of the string trimmer <NUM> through the control part <NUM>. The battery assembly <NUM> includes a power cable (not shown), the driving assembly <NUM> includes a driving device <NUM> and a cutting device <NUM>, and the power cable passes through the passage <NUM> of the connecting rod <NUM> and is electrically connected with the driving device <NUM>, so that the battery assembly <NUM> can supply power to the driving device <NUM> through the power cable, and the driving device <NUM> drives the cutting device <NUM> to rotate to cut vegetation on a lawn. In some embodiments, the control part <NUM> is provided with a start switch and a speed controller. The control part <NUM>, the battery assembly <NUM> and the driving assembly <NUM> are all connected through the power cable, so that a start, stop and rotating speed of the driving assembly <NUM> are controlled through the control part <NUM>.

In this present invention, a specific structure of the battery assembly <NUM>, a specific structure of the control part <NUM>, a specific structure of the cutting device <NUM>, a connection method between the battery assembly <NUM> and the connecting rod <NUM>, a connection method between the control part <NUM> and the connecting rod <NUM>, and a control method of the control part <NUM> on the driving device <NUM> may be designed according to a conventional technology, and will not be described again here. The following description will mainly describe in detail a specific structure of the driving assembly <NUM>, a connection structure between the driving device <NUM> and the battery assembly <NUM>, and a connection method between the connecting rod <NUM> and the driving assembly <NUM>.

Please refer to <FIG>. The driving assembly <NUM> further includes a housing <NUM>, a connecting base <NUM>, a driving device <NUM> and an air extraction device <NUM>. The connecting base <NUM> is connected with the housing <NUM> and the driving device <NUM> respectively. A housing cavity <NUM> is arranged in the housing <NUM> so that part or all of the driving device passes through the connecting base <NUM> and is housed in the housing cavity <NUM>. The connecting base <NUM> is arranged between the driving device <NUM> and the housing <NUM> to close the housing cavity <NUM>. The air extraction device <NUM> is located at an end of the driving device <NUM> away from the housing <NUM> and is connected with the driving device <NUM>, so that the driving device <NUM> can drive the air extraction device <NUM> to rotate to draw out air in the housing cavity <NUM>, which enables the air in the housing cavity <NUM> to form an airflow and flow through the driving device <NUM> to dissipate heat from the driving device <NUM>. The cutting device <NUM> is connected with the driving device <NUM>. The driving device <NUM> drives the cutting device <NUM> to rotate to cut vegetation. At the same time, the air extraction device <NUM> is limited between the cutting device <NUM> and the driving device <NUM>, thereby achieving a fixation of the air extraction device <NUM>.

Please refer to <FIG>, <FIG> and <FIG> through <FIG>. The string trimmer <NUM> includes a fixing assembly <NUM>. The connecting assembly <NUM> and the driving assembly <NUM> are connected with each other through the fixing assembly <NUM>. Specifically, the connecting rod <NUM> and the housing <NUM> are connected with each other through the fixing assembly <NUM>. The connecting rod <NUM> is provided with a first positioning hole <NUM> at one end close to the driving assembly <NUM>. The housing <NUM> is provided with a connecting cavity <NUM> for housing the connecting rod <NUM> and a second positioning hole <NUM> communicated with the connecting cavity <NUM>. The first positioning hole <NUM> corresponds to the second positioning hole <NUM>. When an external tooling (not shown) is used to pass through the first positioning hole <NUM> and the second positioning hole <NUM> in sequence, the connecting assembly <NUM> is aligned with the driving assembly <NUM>, and the connecting assembly <NUM> is fixedly connected with the driving assembly <NUM> through the fixing assembly <NUM>. In some embodiments, the external tooling is a positioning pin, and the first positioning hole <NUM> and the second positioning hole <NUM> are both circular holes. The positioning pin passes through the first positioning hole <NUM> and the second positioning hole <NUM> and extends into the passage <NUM> to initially position the connecting rod <NUM> and the housing <NUM> in a circumferential direction, then the connecting rod <NUM> and the housing <NUM> are fixed through the fixing assembly <NUM>, and the external tooling is take out.

Specifically, the connecting rod <NUM> is provided with a first fixing hole <NUM>, and the housing <NUM> is provided with a second fixing hole <NUM> communicated with the connecting cavity <NUM> and corresponding to the first fixing hole <NUM>. The fixing assembly <NUM> passes through the first fixing hole <NUM> and the second fixing hole <NUM> to realize a fixed connection between the connecting assembly <NUM> and the driving assembly <NUM>. In other words, when the external tooling passes through the corresponding first positioning hole <NUM> and the second positioning hole <NUM>, the first fixing hole <NUM> and the second fixing hole <NUM> also correspond to each other. The fixing assembly <NUM> passes through the first fixing hole <NUM> and the second fixing hole <NUM> to fix the connecting assembly <NUM> and the driving assembly <NUM> so as to prevent the connecting rod <NUM> from circumferential rotation relative to the housing <NUM>. In some embodiments, the fixing assembly <NUM> is a screw. When the positioning pin passes through the first positioning hole <NUM> and the second positioning hole <NUM> to achieve a preliminary positioning between the connecting rod <NUM> and the housing <NUM>, the screw passes through the first fixing hole <NUM> and the second fixing hole <NUM> to fix the connecting rod <NUM> and housing <NUM>.

In this embodiment, an axis along an extension direction of the connecting rod <NUM> is defined as a central axis of the connecting rod <NUM>, and an axis of the connecting cavity <NUM> along the extension direction of the connecting rod <NUM> is defined as a central axis of the connecting cavity <NUM>. When the connecting rod <NUM> is housed in the connecting cavity <NUM>, the central axis of the connecting rod <NUM> overlaps with the central axis of the connecting cavity <NUM>, and a relative spatial position of the first fixing hole <NUM>, the central axis of the connecting rod <NUM> and the first positioning hole <NUM> are the same that of the second fixing hole <NUM>, the central axis of the connecting cavity <NUM> and the second positioning hole <NUM>. The connecting rod <NUM> housed in the connecting cavity <NUM> is rotated so that the first positioning hole <NUM> and the second positioning hole <NUM> correspond to each other and the first fixing hole <NUM> and the second fixing hole <NUM> also correspond to each other. In some embodiments, the first positioning hole <NUM> and the first fixing hole <NUM> are respectively arranged on two sides of the central axis of the connecting rod <NUM>, and the first positioning hole <NUM> and the first fixing hole <NUM> are arranged opposite to each other in a misaligned way.

Please refer to <FIG>, <FIG> and <FIG>. The connecting cavity <NUM> is provided with a protruding block <NUM> protruding from the housing <NUM> toward inside of the connecting cavity <NUM>. The connecting rod <NUM> extends into the connecting cavity <NUM> so that an end of the connecting rod <NUM> abuts the protruding block <NUM>. Specifically, a cutting plane of the cutting device <NUM> is defined as a horizontal plane. An opening direction of the connecting cavity <NUM> and a mounting direction of the connecting rod <NUM> are inclined relative to the horizontal plane. The protruding block <NUM> is arranged at one end of the connecting cavity <NUM> close to the horizontal plane. One end of the connecting rod <NUM> extending into the connecting cavity <NUM> includes a first part and a second part. The first part and the second part are surrounded to form an opening <NUM>. When the connecting rod <NUM> extends into the connecting cavity <NUM>, an edge of the first part abuts the protruding block <NUM> to limit a length of the connecting rod <NUM> extending into the connecting cavity <NUM>. The first positioning hole <NUM> is opened in the first part, and the first fixing hole <NUM> is opened in the second part. The first positioning hole <NUM> and the first fixing hole <NUM> are respectively arranged on two sides of the central axis of the connecting rod <NUM> to facilitate the operator to mount the connecting rod <NUM> and the housing <NUM>.

The connecting cavity <NUM> is communicated with the housing cavity <NUM> of the housing <NUM>, so that when the driving device <NUM> drives the air extraction device <NUM> to rotate, the air can flow into the connecting cavity <NUM> from the passage <NUM> of the connecting rod <NUM> through the opening <NUM>, and then enter the housing cavity <NUM> to dissipate heat from the driving device <NUM>. A design of the opening <NUM> allows the air in the passage <NUM> to quickly enter the connecting cavity <NUM> and flow to the driving device <NUM> evenly, so as to dissipate heat evenly from the driving device <NUM>.

Please refer to <FIG> combined with <FIG> and <FIG>. The driving assembly <NUM> includes a locking component (not shown). The housing <NUM> is provided with a fastening groove <NUM> and a fastening part <NUM>. Wherein, the fastening groove <NUM> is communicated with the connecting cavity <NUM>, and there are two the fastening parts <NUM> arranged on two sides of the fastening groove <NUM>. The locking component is respectively connected with the two fastening parts <NUM> to reduce a size of the fastening groove <NUM>. Specifically, the fastening part <NUM> protrudes outward from the housing <NUM>, and the fastening groove <NUM> penetrates the housing <NUM> to communicate with the connecting cavity <NUM>. The fastening groove <NUM> extends inward from a side of the housing <NUM> close to the connecting rod <NUM> and is communicated with the second positioning hole <NUM>, which means that the fastening groove <NUM> is arranged in a long strip shape. When the connecting rod <NUM> is housed in the connecting cavity <NUM>, the first part abuts the protruding block <NUM> to limit a length of the connecting rod <NUM> extending into the connecting cavity <NUM>, and then external tooling extends into the first positioning hole <NUM> and the second positioning hole <NUM> to achieve the preliminary positioning between the connecting rod <NUM> and the housing <NUM>. And then the fixing assembly <NUM> passes through the first fixing hole <NUM> and the second fixing hole <NUM> to realize a circumferential positioning between the connecting rod <NUM> and the housing <NUM> to prevent the connecting rod <NUM> from rotating relative to the housing <NUM>. Finally, the locking component passes through the two fastening parts <NUM> to drive the locking component, so as to reduce a distance of the fastening groove <NUM>, so that the connecting rod <NUM> is in contact with an inner wall of the connecting cavity <NUM> and the housing <NUM> locks the connecting rod <NUM>, which further improves a stability of the connection between the housing <NUM> and the connecting rod <NUM>.

Please refer to <FIG>, <FIG> combined with <FIG> and <FIG>. The driving device <NUM> includes a driving body <NUM>, a mounting part <NUM> and an output shaft <NUM>. The output shaft <NUM> includes an input section <NUM> and an output section <NUM> that are connected with each other. Wherein, the input section <NUM> is housed in the driving body <NUM>, and the output section <NUM> extends outward from the driving body <NUM>, so that the driving body <NUM> can input driving force in the input section <NUM> and transmit the force to the output section <NUM>, which realizes that the driving body <NUM> drives the output shaft <NUM> to rotate for outward power output. The mounting part <NUM> is arranged on a side of the driving body <NUM> close to the output section <NUM>. A receiving hole <NUM> is arranged on the connecting base <NUM>. A side of the driving body <NUM> away from the output section <NUM> passes through the receiving hole <NUM> so that a bottom of the connecting base <NUM> is connected with the mounting part <NUM>. Specifically, the air extraction device <NUM> is connected with the output section <NUM> so that the driving body <NUM> can drive the output shaft <NUM> to rotate and drive the air extraction device <NUM> to rotate, so as to drive air around the driving body <NUM> and reduce a temperature of the driving body <NUM>. In some embodiments, the air extraction device <NUM> and the output shaft <NUM> rotate synchronously, and the driving body <NUM> is a motor.

The connecting base <NUM> includes a connecting part <NUM>. The receiving hole <NUM> is located in a center position of the connecting part <NUM> and penetrates the connecting part <NUM>. A shape and size of the driving body <NUM> are the same as a shape and size of the receiving hole <NUM>, so that the driving body <NUM> can be housed in the receiving hole <NUM>, and an outer side wall of the driving body <NUM> is in contact with an inner side wall of the receiving hole <NUM>, which improves a connection strength between the driving body <NUM> and the connecting base <NUM>. A size of the mounting part <NUM> is larger than the size of the driving body <NUM>, so that when the driving body <NUM> passes through the receiving hole <NUM>, the mounting part <NUM> can be fixedly connected with the connecting part <NUM> to limit a position of the driving body <NUM> relative to the connecting base <NUM>. With this arrangement, the driving body <NUM> is directly connected with the air extraction device <NUM> through the output section <NUM>, which eliminates a thickness of the connecting base <NUM> between the driving body <NUM> and the air extraction device <NUM>, reduces a distance between the air extraction device <NUM> and the driving body <NUM>, and improves air extraction efficiency of the air extraction device <NUM> and a heat dissipation effect of a whole machine.

Please refer to <FIG>, <FIG> and <FIG> combined with <FIG>. The driving assembly <NUM> includes the locking component. The connecting part <NUM> is provided with a first through hole <NUM> and the mounting part <NUM> is provided with a mounting hole <NUM>. The locking component passes through the first through hole <NUM> and the mounting hole <NUM> to connect the driving device <NUM> and connecting base <NUM>. The mounting portion <NUM> includes a mounting protrusion <NUM>. A bottom of the connecting part <NUM> is concave inward to form a clamping groove <NUM> corresponding to the mounting protrusion <NUM>. At least part of the mounting protrusion <NUM> is housed in the clamping groove <NUM>.

Specifically, a protruding direction of the mounting protrusion <NUM> is to extend from the driving body <NUM> in a direction away from the driving body <NUM>, and the mounting hole <NUM> is arranged on the mounting protrusion <NUM> and penetrates the mounting protrusion <NUM>. A shape and size of the clamping groove <NUM> corresponds to the mounting protrusion <NUM>, and the clamping groove <NUM> does not penetrate the connecting part <NUM>, so that when the mounting portion <NUM> abuts the connecting part <NUM>, at least part of the mounting protrusion <NUM> is housed in the clamping groove <NUM> and enables an upper surface of the mounting protrusion <NUM> to abut the connecting part <NUM>. Wherein, the first through hole <NUM> is arranged inside the clamping groove <NUM> and penetrates the connecting part <NUM>. When the mounting protrusion <NUM> is housed in the clamping groove <NUM>, the first through hole <NUM> corresponds to the mounting hole <NUM>, so that the locking component may pass through the first through hole and the mounting hole <NUM> to realize a connection between the mounting part <NUM> and the connecting part <NUM>.

In this embodiment, three mounting protrusions <NUM> are arranged evenly on the mounting portion <NUM>, three mounting holes <NUM> are arranged corresponding to the mounting protrusions <NUM>, and both the clamping groove <NUM> and the first through hole <NUM> are provided with three corresponding the mounting protrusions <NUM>. When the driving device <NUM> is housed in the receiving hole <NUM> and the mounting part <NUM> abuts the connecting part <NUM>, the driving device <NUM> is rotated, so that the mounting protrusions <NUM> can be housed in the clamping groove <NUM>, which means that the mounting hole <NUM> corresponds to the first through hole <NUM>, and the driving device <NUM> and the connecting base <NUM> are fixed through the locking component. Of course, in other embodiments, multiple mounting holes <NUM> may be arranged on the mounting part <NUM>, which is not limited here.

The connecting base <NUM> is further provided with a second through hole <NUM>. After the driving body <NUM> is fixedly connected with the connecting base <NUM>, the connecting base <NUM> abuts the housing <NUM>, and the locking component passes through the second through hole <NUM> and is connected with the housing <NUM> to house part of the driving body <NUM> in the housing cavity <NUM>. The driving body <NUM> is housed through the connecting base <NUM> and the driving body <NUM>. Specifically, the mounting part <NUM> is mounted on a side of the connecting part <NUM> away from the housing <NUM>, which means that the driving body <NUM> passes through the receiving hole <NUM> from a side of the connecting part <NUM> away from the housing <NUM> and is placed in the housing cavity <NUM>. The air extraction device <NUM> is sleeved on the output section <NUM> and abuts the connecting base <NUM> to reduce a distance between the air extraction device <NUM> and the driving body <NUM>.

The connecting part <NUM> is provided with a plurality of air outlet holes <NUM>. The plurality of air outlet holes <NUM> is evenly arranged around the receiving hole <NUM> and all penetrate the connecting part <NUM>. When the driving device <NUM> drives the air extraction device <NUM> to rotate, the air in the housing cavity <NUM> passes through the air outlet holes <NUM> and the air extraction device <NUM> and is blown outward to cool down the driving device <NUM>.

Please refer to <FIG>, <FIG> and <FIG>. The driving device <NUM> further includes a bearing <NUM> arranged between the mounting part <NUM> and the output shaft <NUM>. Part of the mounting part <NUM> is sleeved on an outside of the driving body <NUM>, and the other part of the mounting part <NUM> is sleeved on an outside of the output shaft <NUM> through the bearing <NUM>, so that the output shaft <NUM> can rotate relative to the mounting part <NUM>. A side of the air extraction device <NUM> close to the driving body <NUM> is provided with an abutting end <NUM> extending a direction toward of the driving body <NUM>. The abutting end <NUM> abuts part of the bearing <NUM>, so that the abutting end <NUM> can rotate together with the bearing <NUM> driven by the output shaft <NUM> to drive the air in the housing cavity <NUM> to flow. Of course, in other embodiments, the mounting part <NUM> may be directly fixedly connected with the driving body <NUM>. In this case, the bearing <NUM> is arranged between the output shaft <NUM> and the driving body <NUM>, so that the output shaft <NUM> can rotate relative to the driving body <NUM> to further reduce a distance between the air extraction device <NUM> and the driving body <NUM>, which is not limited herein.

Please refer to <FIG>, the air extraction device <NUM> includes a fan blade <NUM> and a transmission component <NUM> connected with the fan blade <NUM>. The fan blade <NUM> is provided with a clamping hole <NUM>, and the transmission component <NUM> is provided with a gear part <NUM>. The transmission component <NUM> is housed in the clamping hole <NUM> and is connected with the fan blade <NUM> through the gear part <NUM>. Specifically, the gear part <NUM> is located around an edge of the transmission component <NUM>, and a side wall edge of the clamping hole <NUM> is provided with a toothed part <NUM> corresponding to the gear part <NUM>. When the transmission component <NUM> is housed in the clamping hole <NUM>, the gear part <NUM> meshes with the toothed part <NUM>, so that the transmission component <NUM> and the fan blade <NUM> can rotate synchronously with a matching of the gear part <NUM> and the toothed part <NUM>.

A side of the transmission component <NUM> close to the driving device <NUM> is provided with the abutting end <NUM> protruding toward the driving device <NUM> for abutting the bearing <NUM>, so as to maintain a certain distance between the fan blades <NUM> and the mounting part <NUM>, which avoids a contact between the fan blades <NUM> and the mounting part <NUM> and reduces wear. In some embodiments, a distance between the fan blades <NUM> and the mounting part <NUM>, in an extension direction of the output shaft <NUM>, is <NUM>. Of course, in other embodiments, a protruding length of the abutting end <NUM> may be adjusted according to actual situation to adjust the distance between the fan blades <NUM> and the mounting part <NUM>, which is not limited here.

Please refer to <FIG>, <FIG>. The fan blade <NUM> includes a supporting plate <NUM>, a bottom plate <NUM> and several blade pieces <NUM>. The several blade pieces <NUM> are radially distributed with the clamping hole <NUM> as a center. The supporting plate <NUM> and the bottom plate <NUM> are respectively arranged on both sides of the blade <NUM> and are arranged in a misaligned way. Specifically, the supporting plate <NUM> is arranged on a side of the fan blade <NUM> close to the driving device <NUM> and connected with several blade pieces <NUM>. The bottom plate <NUM> is arranged on a side of the fan blade <NUM> away from the driving device <NUM> and is connected with several blade pieces <NUM>.

Specifically, the blade piece <NUM> is divided into two parts, one part is arranged close to the clamping hole <NUM>, and the other part is arranged away from the clamping hole <NUM>. The bottom plate <NUM> is connected with the part close to the clamping hole <NUM> and is located on a side of the blade piece <NUM> away from the driving device <NUM>. The supporting plate <NUM> is connected with the part away from the clamping hole <NUM> and is located on a side of the blade piece <NUM> close to the driving device <NUM>, so that when the fan blade <NUM> rotates, air in a part of the air extraction device <NUM> close to the clamping hole <NUM> flows in a direction away from the clamping hole <NUM> under an action of two adjacent blade pieces <NUM> and the bottom plate <NUM>, and is blown outward under an action of two adjacent blades <NUM> and the supporting plate <NUM>.

Please refer to <FIG>, <FIG>. A transmission hole <NUM> and a transmission surface <NUM> located in the transmission hole <NUM> are arranged at a center of the transmission component <NUM>. The output shaft <NUM> is provided with an anti-slip surface <NUM>. A shape and size of the output shaft <NUM> are matched with a shape and size of the transmission hole <NUM>, so that the output shaft <NUM> is housed in the transmission hole <NUM> and the transmission surface <NUM> is fitted with the anti-slip surface <NUM>. This arrangement allows the air extraction device <NUM> to rotate synchronously with the output shaft <NUM>.

The output section <NUM> is provided with a first fixing end <NUM> at one end away from the driving body <NUM>. The driving assembly <NUM> includes the cutting device <NUM>, a second fixing end and a shaft hole <NUM> located in the cutting device <NUM>. The output section <NUM> passes through the shaft hole <NUM> and connects the first fixing end <NUM> with the second fixing end to limit the air extraction device <NUM> between the driving device <NUM> and the cutting device <NUM>. Specifically, a shape and size of the shaft hole <NUM> match the shape and size of the output section <NUM>, and the first fixing end <NUM> and the second fixing end are connected through threads, so that a distance between the cutting device <NUM> and the driving body <NUM> can be changed. Through a mutual matching between the first fixing end <NUM> and the second fixing end, the air extraction device <NUM> is limited between the driving body <NUM> and the cutting device <NUM>, and the output shaft <NUM> and the cutting device <NUM> may rotate synchronously.

In this embodiment, the first fixing end <NUM> is connected with the second fixing end to limit the air extraction device <NUM> between the mounting part <NUM> and the cutting device <NUM>, and to enable a side of the cutting device <NUM> close to the driving device to abut the bottom plate <NUM> of the air extraction device <NUM>. The distance between the cutting device <NUM> and the driving body <NUM> is reduced through a rotation of the first fixing end <NUM> and the second fixing end, until the abutting end <NUM> of the air extraction device <NUM> abuts the bearing <NUM> of the driving device <NUM>, the distance between the fan blades <NUM> and the driving body <NUM> are maintained while the air extraction device <NUM> and the cutting device <NUM> rotate synchronously. Of course, in other embodiments, the air extraction device <NUM> may also be fixed or limitedly connected with the output section <NUM> to maintain the distance between the fan blades <NUM> and the driving body <NUM>, which is not limited here.

Please refer to <FIG>, <FIG> and <FIG>. The driving device <NUM> includes a connecting wire <NUM> with one end connected with the driving body <NUM> and the other end detachably electrically connected with the power cable of the battery assembly <NUM>, so that the battery assembly <NUM> can supply power to the driving device <NUM> through the power cable and the connecting wire <NUM>. The connecting base <NUM> is provided with an accommodating part <NUM> and an accommodating cavity <NUM> formed in the accommodating part <NUM>. At least part of the connecting wire <NUM> and at least part of the power cable are accommodated in the accommodating cavity <NUM>. On the one hand, the connecting wire <NUM> and the power cable may be conveniently connected and separated, and on the other hand, excess cables may be stored to avoid exposures of the cables. Of course, in other embodiments, the connecting wire <NUM> of the driving device <NUM> may also be electrically connected with other external power sources, which is not limited here.

Specifically, a side of the connecting base <NUM> close to the air extraction device <NUM> is defined as a bottom of the connecting base <NUM>. The bottom of the connecting base <NUM> is depressed inward to form the accommodating cavity <NUM>, and the accommodating cavity <NUM> is located beside the accommodating hole <NUM> and corresponds to the accommodating cavity <NUM>. The accommodating part <NUM> is also provided with a through hole <NUM> communicated to the accommodating cavity <NUM>. The through hole <NUM> is arranged on a side of the accommodating part <NUM> close to the housing <NUM> and connects the accommodating cavity <NUM> with the housing cavity <NUM>. The power cable passes through the passage <NUM> of the connecting rod <NUM>, the connecting cavity <NUM>, the housing cavity <NUM>, the through hole <NUM> and the accommodating cavity <NUM> in sequence from the battery assembly <NUM> and is electrically connected with the connecting wire <NUM> and the excess cable after connection is housed in the accommodating cavity <NUM>, so as to supply power to the driving body <NUM>.

An end of the connecting wire <NUM> away from the driving device <NUM> is provided with a connecting terminal <NUM>, and the power cable is provided with a power terminal (not shown). The power terminal passes through the through hole <NUM> and is plugged into the connecting terminal <NUM> and is housed in the accommodation cavity <NUM>. The connecting terminal <NUM> and the power terminal are configured to be plugged in, so as to realize a convenient connection between the connecting wire <NUM> and the power cable and facilitate a replacement of the driving body <NUM>. In this embodiment, the connecting terminal <NUM> is a male terminal and the power terminal is a female terminal to realize an insertion between the connecting terminal <NUM> and the power terminal. Of course, in other embodiments, the connecting terminal <NUM> may be a female terminal and the power terminal is a male terminal, and the connecting terminal <NUM> and the power terminal may also be detachably connected through other structures, which is not limited here.

The connecting base <NUM> includes the connecting part <NUM> and a blocking plate <NUM> matching the accommodating part <NUM>. The blocking plate <NUM> is connected with the accommodating part <NUM> to cover the power cable and the connecting wire <NUM> housed in the accommodating cavity <NUM>. Specifically, the accommodating part <NUM> is provided with a third through hole <NUM>, and a fourth through hole <NUM> corresponding to the third through hole <NUM> is arranged on the blocking plate <NUM>. The locking component passes through the third through hole <NUM> and the fourth through hole <NUM> to connect the blocking plate <NUM> and the accommodating part <NUM>, so as to cover the accommodating cavity <NUM>.

The connecting part <NUM> is further provided with a wire groove <NUM> connected with the accommodation cavity <NUM>. The connecting wire <NUM> is placed between the connecting part <NUM> and the blocking plate <NUM> and is housed in the wire groove <NUM> to prevent the connecting wire <NUM> from being squeezed when the blocking plate <NUM> and the connecting part <NUM> are assembled, thereby prolonging a duration life of the connecting wire <NUM>.

Specifically, when the driving body <NUM> is damaged and needs to be repaired or replaced, the mounting part <NUM> is disassembled to separate the driving body <NUM> from the connecting base <NUM>, the blocking plate <NUM> is disassembled, and the connecting terminal <NUM> and the power terminal are disassembled so that the driving body <NUM> can be completely separated from the driving assembly <NUM>. When mounting, an assembly tool is used to assemble the mounting part <NUM> and the connecting base <NUM>, the connecting terminal <NUM> is electrically connected with the power terminal, then the excess connecting wires <NUM> and power cables are stored in the accommodation cavity <NUM>, and the blocking plate <NUM> is mounted to cover the accommodation cavity <NUM>, so that an assembly of the driving device <NUM> is completed.

In this embodiment, the driving assembly <NUM> is used in the string trimmer <NUM>. At this time, the cutting device <NUM> is a string trimmer head. The cutting device <NUM> is driven to rotate through the driving device <NUM> to achieve external work. On the one hand, the distance between the fan blades <NUM> and the driving body <NUM> is reduced, which enables a heat dissipation effect of the driving body <NUM> to be better. On the other hand, a detachable electrical connection between the power cable and the connecting wire <NUM> facilitates a replacement or maintenance of the driving body <NUM>. Of course, in other embodiments, the driving assembly <NUM> may also be used in a hedge trimmer. In this case, the cutting device <NUM> is a blade arranged at a front end of the hedge trimmer. The driving device <NUM> drives the blade to move forward and backward, so that the vegetation is cut, and a connection method of the cutting device <NUM> on the hedge trimmer is the same as that on the string trimmer, which will not be described again here.

In summary, the string trimmer <NUM> of the present invention is provided with the first positioning hole <NUM> on the connecting rod <NUM> and the second positioning hole <NUM> on the housing <NUM>, and the external tooling is used to pass through the first positioning hole <NUM> and the second positioning hole <NUM>, which realizes the preliminary positioning between the connecting rod <NUM> and the housing <NUM>. At this time, the housing <NUM> and the connecting rod <NUM> are assembled through the fixing assembly <NUM>, which avoids the fixing assembly <NUM> from damaging the housing <NUM> and the connecting rod <NUM>, and improves a yield rate of the product. And at the same time, an assembly efficiency of the connecting rod <NUM> and the housing <NUM> is improved. Through arranging the receiving hole <NUM> on the connecting base <NUM> that matches the driving body <NUM>, the side of the driving body <NUM> away from the output section <NUM> passes through the receiving hole <NUM> and enables the driving body <NUM> to be housed in the receiving hole <NUM>, so that there is no blocking of the connecting the base <NUM> between the air extraction device <NUM> and the driving body <NUM>, reducing the distance between the air extraction device <NUM> and the driving body <NUM>, and improving the heat dissipation effect of the air extraction device <NUM> on the driving body <NUM> and an overall power and performance of the driving assembly <NUM>. Through arranging the connecting wire <NUM> on the driving device <NUM> and detachably connecting the driving device <NUM> to the external power cable through the connecting wire <NUM>, the driving device <NUM> may be conveniently disassembled and replaced. Through arranging the accommodating cavity <NUM> for accommodating the connecting wire <NUM> and the power cable on the connecting base <NUM> to store excess cables and avoid damage caused by exposed cables. Through arranging the blocking plate <NUM> corresponding to the accommodating cavity <NUM>, a sealing of the accommodation cavity <NUM> is realized. A bearing <NUM> is arranged between the mounting part <NUM> and the output shaft <NUM>, so that the output shaft <NUM> can rotate relative to the mounting part <NUM>. Through arranging the supporting plate <NUM> and the bottom plate <NUM> on two sides of the blade <NUM> respectively in the misaligned way, the air in the driving device <NUM> may be discharged outward and the heat dissipation of the driving body <NUM> can be achieved.

Claim 1:
A driving assembly, comprising:
a connecting base (<NUM>), and
a driving device (<NUM>), comprising a driving body (<NUM>), a mounting part (<NUM>) and an output shaft (<NUM>), wherein
the output shaft (<NUM>) comprises an input section (<NUM>) and an output section (<NUM>), the input section (<NUM>) is housed in the driving body (<NUM>) and extends outward from the driving body (<NUM>) to form the output section (<NUM>), the mounting part (<NUM>) is arranged on a side of the driving body (<NUM>) close to the output section (<NUM>), characterized in that a receiving hole (<NUM>) is arranged on the connecting base (<NUM>), and a side of the driving body (<NUM>) away from the output section (<NUM>) passes through the receiving hole (<NUM>) and connects a bottom of the connecting base (<NUM>) with the mounting part (<NUM>).