Patent ID: 12256666

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present invention is described in further detail below with reference to the drawings and embodiments.

Referring toFIG.1,FIG.1shows a major structure of a mowing cylinder cutter driven by a built-in outer rotor motor according to a first embodiment of the present invention. As shown inFIG.1, the mowing cylinder cutter10driven by a built-in outer rotor motor includes blades20and a reel30. The blades20are multiple and spiral, and the blades20are fixedly connected to the reel30through a plurality of support plates21respectively. An outer rotor motor41is provided at one end of the reel30. The outer rotor motor41includes a stator assembly42and an outer rotor43. The stator assembly42is connected to a frame (not shown) through a connecting member44, and the frame may be a frame of a lawn mower. The outer rotor43is connected to the reel30.

It should be noted that the connection between the outer rotor43and the reel30may be a direct connection, that is, the outer rotor43is directly connected to the reel30. It may also be an indirectly connection. For example, the outer rotor43is connected to the reel30through the support plate21or the blade20or other component connected to the reel30. Any connection is acceptable as long as the outer rotor43can drive the reel30to rotate. The outer rotor motor41may be provided at one or both ends of the reel30. That is, the reel30may be provided with an outer rotor motor41at only one end, or may be provided with an outer rotor motor41at each end.

In this embodiment, the blades20, the reel30and the support plates21are fixedly connected by welding. The outer rotor43is fixedly connected to the blades20and the reel30through the support plates21. Specifically, the outer rotor43is fixedly connected to the support plates21through fixing bolts50, and the blades20are welded to the support plates21. Of course, the outer rotor43may also be directly fixedly connected to the blades20or the reel30. The connecting member44includes a second sleeve71having a hollow cylindrical shape. The stator assembly42includes a stator coil provided on the second sleeve71. The second sleeve71is sleeved on the reel30and has a gap with the reel30. In other words, the reel30passes through the second sleeve71and extends, and the reel30can rotate freely. A bearing51is provided at an end of the reel30adjacent to an outer side of the outer rotor motor41. The bearing51is provided in a bearing seat52. The bearing seat52is fixedly connected to the second sleeve71. Specifically, the bearing seat52and the connecting member44may be integrally formed. The stator assembly42and the connecting member44as a whole can be assembled or disassembled from the reel30simultaneously.

An inner wall of the outer rotor43is circumferentially inlaid with magnetic steel. An inner end of the outer rotor43extends axially to the reel30. Thus, the outer rotor43forms an end cap on an inner side to prevent an internal component of the outer rotor motor41from being exposed. In this embodiment, the reel30includes a large-diameter section31and a small-diameter section32. A step33is formed between the large-diameter section31and the small-diameter section32. The inner end of the outer rotor43extends axially to the step33, so as to limit the outer rotor motor41.

Referring toFIG.2, a radial labyrinth seal is formed between the outer end of the connecting member44and the outer end of the outer rotor43. Specifically, the outer end of the outer rotor43extends radially to form a flange47. An outer end surface of the flange47is provided with two annular notches48. An outer end of the connecting member44extends to the flange47. An end surface of the connecting member44facing the flange47is correspondingly provided with two annular lug bosses49. The two lug bosses49are inserted into the two notches48to form the radial labyrinth seal between the outer end of the connecting member44and the outer end of the outer rotor43. It should be noted that there may be one or more than one notch48and lug boss49, which is not limited herein. Obviously, the lug boss49may also be provided on the flange47, and correspondingly, the notch48may be provided on the connecting member44, provided that the radial labyrinth seal can be formed between the outer end of the connecting member44and the outer end of the outer rotor43.

In use, two ends of the reel30can be supported by a bearing assembly. The reel30, the support plates21, the blades20and the outer rotor43rotate synchronously. The stator assembly42is fixed to the frame through the connecting member44to keep still, and the outer rotor43drives the blades20to rotate. In this way, the direct drive of the built-in outer rotor motor avoids the efficiency loss of the related transmission mechanism, greatly improves the working efficiency of the cylinder cutter, greatly reduces the noise of the whole machine, and realizes a compact structure.

Referring toFIG.3,FIG.3shows a major structure of a mowing cylinder cutter driven by a built-in outer rotor motor according to a second embodiment of the present invention. As shown inFIG.3, the mowing cylinder cutter10driven by a built-in outer rotor motor includes blades20and a reel30. The blades20are multiple and spiral. A motor compartment40is provided at one end of the reel30. The blades20are fixedly connected to the reel30and the motor compartment40through a plurality of support plates21respectively. An outer rotor motor41is provided in the motor compartment40. The outer rotor motor41includes a stator assembly42and an outer rotor43. The stator assembly42is connected to a frame through a connecting member44. The outer rotor43is fixedly connected to the support plate21on the motor compartment40and further fixedly connected to the reel30.

In this embodiment, the connecting member44is a motor shaft70, and the reel30is shaped as a hollow straight cylinder. The reel30may also be set as a hollow variable-diameter cylinder if necessary. The motor shaft70passes through the reel30, and two ends of the motor shaft70extend out of the reel. The stator assembly42is directly circumferentially limited on the motor shaft70through a key46. The two ends of the motor shaft70are provided with flat positions, and the motor shaft is fixedly connected to a frame through the flat positions. Bearings51are further provided at the two ends of the motor shaft70, and the bearings51are respectively provided in bearing seats52. A bearing seat52at an end adjacent to one end of the outer rotor motor41is integrally formed with the outer rotor43, and a bearing seat52at an end far away from the outer rotor motor41is fixedly connected to the reel30. The outer rotor43is fixedly connected to the support plate21at an end of the motor compartment40by a fixing bolt50.

In order to ensure the assembly accuracy of the outer rotor motor41, the outer rotor43and the bearing seat52integrally formed there-with are adapted to the shape of the motor compartment40, and the bearing seat52at the other end is adapted to the shape of the reel30to ensure that the overall structure is concentric. In use, the motor shaft70is fixed to the frame by the flat positions at both ends, and the stator assembly42is fixed to the motor shaft70by the key46and remains stationary. The outer rotor43is fixedly connected to the support plate21by a fixing bolt50, such that the cylinder cutter is driven to rotate by the outer rotor of the motor.

Referring toFIG.4,FIG.4shows a major structure of a mowing cylinder cutter driven by a built-in outer rotor motor according to a third embodiment of the present invention. As shown inFIG.4, the mowing cylinder cutter10driven by a built-in outer rotor motor includes blades20and a reel30. The blades20are multiple and spiral. Motor compartments40are provided at two ends of the reel30. The blades20are fixedly connected to the reel30and the motor compartments40through a plurality of support plates21respectively. An outer rotor motor41is provided in each of the motor compartments40. The outer rotor motor41includes a stator assembly42and an outer rotor43. The stator assembly42is connected to a frame through the connecting member44. The outer rotor43is fixedly connected to the support plate21on the motor compartment40and further fixedly connected to the reel30.

In this embodiment, the connecting member44is a motor shaft70, and the reel30is shaped as a hollow straight cylinder. The reel30may also be set as a hollow variable-diameter cylinder if necessary. The motor shaft70passes through the reel30, and two ends of the motor shaft70extend out of the reel. The two ends of the motor shaft70are provided with flat positions, and the motor shaft70is fixed to a frame through the flat positions. The stator assembly42includes a first sleeve421and a stator coil422. The stator coil422is provided on the first sleeve421. The first sleeve421is provided on the motor shaft70and is circumferentially limited through a key46to keep still during use. The stator assembly42and the motor shaft70as a whole can be assembled or disassembled from the reel30simultaneously. The outer rotor43is fixed to the support plate21at an end adjacent to the motor compartment40by a fixing bolt50. In this way, two outer rotor motors are arranged symmetrically on two sides of the cylinder cutter, which minimizes the influence of the built-in motors on the discharging of grass and realizes the power distribution between the two ends. In addition, under the premise of meeting the requirements of use, this design is more compact than the one-sided design of motor.

In this embodiment, the motor compartments40and the reel30are fixed as a whole. Of course, they may also be independent of each other. The motor compartments40each are provided with an opening toward the outside, and the outer rotor motor41is provided in the motor compartment40from the opening. An end cap45is provided outside the outer rotor motor41. The end cap45is integrally formed with the outer rotor43of the outer rotor motor41, and is matched with the motor compartment40to seal the outer rotor motor41in the motor compartment40. A center of the end cap45is provided with a bearing51, and the motor shaft70is connected to and passes through the bearing51.

An embodiment of the present invention further provides a lawn care tool driven by a built-in outer rotor motor for lawn care operations such as root cutting and grass grooming. The lawn care tool driven by a built-in outer rotor motor provided by the present invention is described in detail below with reference to the drawing.

Referring toFIG.5,FIG.5shows a major structure of the lawn care tool driven by a built-in outer rotor motor. As shown inFIG.5, the lawn care tool90driven by a built-in outer rotor motor provided by this embodiment includes a working part80, a main shaft60, a motor shaft70and an outer rotor motor41. The main shaft60is shaped as a hollow cylinder. The motor shaft70passes through the main shaft60, and two ends of the motor shaft70extend out of the main shaft. One end of the main shaft60is connected to the motor shaft70through a bearing assembly, and the outer rotor motor41is located in the main shaft60and adjacent to the other end of the main shaft60. The outer rotor motor41includes a stator assembly42, an outer rotor43and two end caps45. The stator assembly42is fixedly connected to the motor shaft70, and the outer rotor43is fixedly connected to the main shaft60. The end caps45and the outer rotor43are integrally formed, and the end caps45are connected to the motor shaft70through bearing assemblies, respectively. The working part80is fixed to an outer surface of the main shaft60.

Specifically, the working part80may be fixedly connected to the outer surface of the main shaft60through a key. Alternatively, the outer surface of the main shaft60is spline-shaped, and the working part80is fixedly connected to the outer surface of the main shaft60through a spline. The fixing method of the working part80to the outer surface of the main shaft60is not limited, as long as the working part can rotate with the main shaft60to perform a corresponding function. The working part80may be a root cutting blade or a grass grooming blade, as shown inFIGS.6and7, but the shapes of the root cutting blade and the grass grooming blade are not limited herein. It should be noted that the corresponding working part80may be replaced according to actual needs, and the specific function and structure of the working part80are not limited. In addition, the working part80may be fixedly connected to the outer surface of the main shaft60at an interval through a spacer sleeve81, and a fixing sleeve82is provided at two ends of the main shaft60for firm locking.

In this embodiment, flat positions are provided at the two ends of the motor shaft70, and the motor shaft70is circumferentially fixed to a frame through the flat positions. An outer end cap45of the outer rotor motor41is integrally formed with the outer rotor43, and is fixed to the main shaft60by a screw83, such that the outer rotor43can rotate synchronously with the main shaft60. In a working state, the motor shaft70and the stator assembly42remain stationary. The outer rotor43drives the root cutting blade or grass grooming blade or other lawn care working part on the main shaft60to rotate to complete root cutting or grass grooming or other lawn care work.

It should be noted that the bearing assembly in the above embodiment may be a combination of a bearing and a bearing seat, which is a conventional design, and will not be repeated here. The outer rotor motor may be an outer rotor brushless motor, which is not limited herein.

In summary, in the mowing cylinder cutter and a lawn care tool driven by a built-in outer rotor motor provided by the present invention, the outer rotor motor is provided inside the cylinder cutter or the working part, and the cylinder cutter or the working part is driven to rotate through the outer rotor. The present invention achieves a compact structure and high transmission efficiency. This design avoids additional efficiency loss, and greatly improves the work efficiency. In addition, the direct drive of the outer rotor motor improves the working torque and can cope with a complex working environment.

The above are preferred embodiments of the present invention and the technical principles thereof. Those skilled in the art should understand that any equivalent changes, simple replacements and other obvious changes made based on the technical solutions of the present invention without departing from the spirit and scope of the present invention should fall within the protection scope of the present invention.