Rear wheel servo drive assembly for mowing vehicle

Abstract

The utility model belongs to the technical field of mowing vehicles, and provides a rear wheel servo drive assembly for a mowing vehicle, which comprises a motor, a speed reducer and a hub. The motor is provided with a rotor and a rotating shaft which are coaxially connected, a plurality of through cavities extending in the axial direction of the rotor are formed in the rotor, and the through cavities are evenly distributed around the central axis of the rotating shaft. The speed reducer is provided with an input shaft for inputting power and an output shaft for outputting power, the input shaft and the output shaft are parallel to each other, and the input shaft is coaxially connected to the rotating shaft; the hub is coaxially connected to the output shaft.

Description

Technical Field

[0001] This application belongs to the technical field of lawn mowers, and particularly relates to a rear-wheel servo drive assembly for a lawn mower. Background Art

[0002] A lawn mower is a common gardening machine, widely used for large-area lawn maintenance and farm operations. To improve operation efficiency, many lawn mowers are equipped with a rear-wheel drive system, which drives the lawn mower forward or backward through the power output of the rear wheels. However, due to poor design, the existing rear-wheel drive system of lawn mowers shows poor flexibility and stability when the lawn mower is turning, accelerating, or coping with slope changes. Therefore, it is necessary to solve the above technical problems. Summary of the Invention

[0003] The purpose of the embodiments of this application is to provide a rear-wheel servo drive assembly for a lawn mower to solve the technical problem of poor flexibility of lawn mowers in the prior art.

[0004] To achieve the above purpose, the technical solution adopted by this application is: to provide a rear-wheel servo drive assembly for a lawn mower, including:

[0005] A motor, having a rotor and a rotating shaft connected coaxially, and a plurality of through cavities extending along the axial direction of the rotor are formed on the rotor, and the plurality of through cavities are evenly distributed around the central axis of the rotating shaft;

[0006] A speed reducer, having an input shaft for inputting power and an output shaft for outputting power, the input shaft and the output shaft are parallel to each other and the input shaft is coaxially connected to the rotating shaft;

[0007] A hub, coaxially connected to the output shaft.

[0008] Optionally, the motor further includes a motor housing, and the speed reducer further includes a speed reducer housing, and the motor housing is detachably connected to the speed reducer housing;

[0009] An internal spline groove is coaxially provided on the rotating shaft, and an external spline is coaxially provided on the input shaft, and the internal spline groove and the external spline are nested with each other.

[0010] Optionally, the motor housing includes a front end cover and a rear end cover arranged at intervals, and further includes an outer housing connected between the front end cover and the rear end cover;

[0011] Bearings coaxially sleeved on the rotating shaft are respectively connected to the front end cover and the rear end cover.

[0012] Optionally, a receiving cavity is recessed on one side of the rear end cover facing away from the front end cover, and the rotating shaft passes through the rear end cover and extends into the receiving cavity;

[0013] The motor further includes a signal disk coaxially connected to the rotating shaft and an adjusting disk coaxially arranged with the rotating shaft and spaced apart therefrom. A plurality of magnetic monomers evenly distributed around the rotating shaft are embedded inside the signal disk. A plurality of Hall sensors evenly distributed around the rotating shaft and used to cooperate with the magnetic monomers to detect the rotation speed of the rotating shaft are connected to the adjusting disk. The motor further includes a circuit board electrically connected to the Hall sensors and a signal line electrically connected to the circuit board. The signal disk, the adjusting disk, the Hall sensors, and the circuit board are all located inside the accommodating cavity.

[0014] Optionally, the accommodating cavity includes a first cavity and a second cavity coaxially arranged. The rear end cover forms a step at the adjacent position of the first cavity and the second cavity for abutting against the adjusting disk.

[0015] A plurality of mounting holes surrounding the central axis of the rotating shaft are formed on the step. A plurality of waist-shaped holes corresponding to the mounting holes are provided on the adjusting disk. The waist-shaped holes extend along the circumferential direction of the adjusting disk.

[0016] Optionally, a convex ring protruding towards the signal disk and coaxially arranged with the rotating shaft is formed on one side of the adjusting disk close to the signal disk. A plurality of accommodating grooves for accommodating the Hall sensors are formed on the convex ring.

[0017] A third cavity for accommodating the convex ring is formed on the signal disk.

[0018] Optionally, the motor further includes a stator coaxially arranged with the rotor, a plurality of winding coils connected to the stator around the central axis of the stator, and a plurality of permanent magnet tiles connected to the rotor around the central axis of the rotor.

[0019] There are 12 permanent magnet tiles, and the number of the winding coils corresponds to the number of the permanent magnet tiles.

[0020] Optionally, the number of the magnetic monomers is a non-zero integer multiple of the number of the permanent magnet tiles, and 3 Hall sensors are provided.

[0021] Optionally, the motor further includes a cover plate detachably connected to the rear end cover and used to close the accommodating cavity.

[0022] The beneficial effects of the rear-wheel servo drive assembly for a lawn mower provided by this application are as follows: Compared with the prior art, in the rear-wheel servo drive assembly for a lawn mower provided by this application, since a number of through cavities provided on the rotor can significantly reduce the weight of the rotor, and since the input shaft and the output shaft of the reducer are parallel to each other and the input shaft is coaxially arranged with the rotating shaft, therefore, under the condition of the same power, the motor can sequentially make the hub connected to the output shaft output a greater rotational speed or a greater torque through the rotor, the rotating shaft, the input shaft and the output shaft, which is beneficial to significantly improve the flexibility of use of the rear-wheel servo drive assembly for a lawn mower in this application, far superior to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is an exploded structural schematic diagram of the rear-wheel servo drive assembly for a lawn mower in the embodiment of this application;

[0025] Figure 2 It is an overall structural sectional view of the rear-wheel servo drive assembly for a lawn mower in the embodiment of this application;

[0026] Figure 3 It is an overall structural schematic diagram of the adjusting disk in the embodiment of this application.

[0027] Among them, the reference numerals in the drawings: 100, motor; 101, rotor; 102, rotating shaft; 103, through cavity; 104, internal spline groove; 105, front end cover; 106, rear end cover; 107, outer housing; 108, bearing; 109, accommodating cavity; 110, signal disk; 111, adjusting disk; 112, Hall sensor; 113, circuit board; 114, signal line; 115, first cavity; 116, second cavity; 117, step; 118, mounting hole; 119, waist-shaped hole; 120, convex ring; 121, accommodating groove; 122, third cavity; 123, stator; 124, winding coil; 125, permanent magnet tile; 126, power line, 127, cover plate; 200, reducer; 201, input shaft; 202, output shaft; 203, reducer housing; 204, external spline; 300, hub. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0032] Please refer to Figures 1 to 3 , and a rear-wheel servo drive assembly for a lawn mower provided by an embodiment of the present application will be described. The rear-wheel servo drive assembly for the lawn mower includes a motor 100, a reducer 200, and a wheel hub 300. Among them:

[0033] The motor 100 has a rotor 101 and a rotating shaft 102 connected coaxially. A plurality of through cavities 103 extending along the axial direction of the rotor 101 are formed on the rotor 101, and the plurality of through cavities 103 are evenly distributed around the central axis of the rotating shaft 102; the reducer 200 has an input shaft 201 for inputting power and an output shaft 202 for outputting power. The input shaft 201 and the output shaft 202 are parallel to each other and the input shaft 201 is coaxially connected to the rotating shaft 102; the wheel hub 300 is coaxially connected to the output shaft 202.

[0034] According to the above structure provided in this embodiment, in the rear-wheel servo drive assembly for a lawn mower provided in this embodiment, since a plurality of through cavities 103 provided on the rotor 101 can significantly reduce the weight of the rotor 101, and since the input shaft 201 and the output shaft 202 of the reducer 200 are parallel to each other and the input shaft 201 is coaxially arranged with the rotating shaft 102, under the condition of the same power, the motor 100 can sequentially pass through the rotor 101, the rotating shaft 102, the input shaft 201, and the output shaft 202 to make the hub 300 connected to the output shaft 202 output a greater rotational speed or a greater torque, thereby being conducive to significantly improving the flexibility of use of the rear-wheel servo drive assembly for a lawn mower in this embodiment. Install two sets of the rear-wheel servo drive assemblies for a lawn mower of this embodiment on the rear axle of the lawn mower, respectively used to drive one rear wheel. At the same time, a feedback system composed of a signal disk 110, an adjustment disk 111, a Hall sensor 112, a circuit board 113, and a signal line 114 is provided on the motor, which can monitor parameters such as the rotational speed and steering of the motor in real time and is electrically connected to the control system of the lawn mower, so that flexible drive controls such as forward, reverse, and in-place steering can be conveniently achieved, far superior to the prior art.

[0035] In another embodiment of the present application, please refer to Figures 1 to 3 , the motor 100 further includes a motor housing, and the reducer 200 further includes a reducer housing 203. The motor housing is detachably connected to the reducer housing 203; an internal spline groove 104 is coaxially arranged on the rotating shaft 102, and an external spline 204 is coaxially arranged on the input shaft 201. The internal spline groove 104 and the external spline 204 are nested with each other. According to the above structure provided in this embodiment, the rotating shaft 102 and the input shaft 201 can be quickly connected by nesting the internal spline groove 104 and the external spline 204, and after the motor housing and the reducer housing 203 are connected, good connection stability can be maintained between the rotating shaft 102 and the input shaft 201, which can further improve the flexibility of use of the rear-wheel servo drive assembly for a lawn mower in this embodiment.

[0036] In another embodiment of the present application, please refer to Figures 1 to 3 , the motor housing includes a front end cover 105 and a rear end cover 106 arranged at intervals, and further includes an outer housing 107 connected between the front end cover 105 and the rear end cover 106; bearings 108 coaxially sleeved on the rotating shaft 102 are respectively connected to the front end cover 105 and the rear end cover 106. According to the above structure provided in this embodiment, the bearings 108 connecting the front end cover 105 and the rear end cover 106 can make the rotating shaft 102 rotate more stably and quickly, which is conducive to further improving the flexibility of use of the rear-wheel servo drive assembly for a lawn mower in this embodiment.

[0037] In another embodiment of the present application, please refer to Figures 1 to 3, the rear end cover 106 is recessed on the side facing away from the front end cover 105 to form a receiving cavity 109, and the rotating shaft 102 passes through the rear end cover 106 and extends into the receiving cavity 109; the motor 100 further includes a signal disk 110 coaxially connected to the rotating shaft 102 and an adjusting disk 111 coaxially arranged with the rotating shaft 102 and spaced apart. A plurality of magnetic monomers (not shown in the drawings) evenly distributed around the rotating shaft 102 are embedded inside the signal disk 110. A plurality of Hall sensors 112 evenly distributed around the rotating shaft 102 and used to cooperate with the magnetic monomers to detect the rotation speed of the rotating shaft 102 are connected to the adjusting disk 111. The motor 100 further includes a circuit board 113 electrically connected to the Hall sensors 112 and a signal line 114 electrically connected to the circuit board 113. The signal disk 110, the adjusting disk 111, the Hall sensors 112, and the circuit board 113 are all located inside the receiving cavity 109.

[0038] According to the above structure provided in this embodiment, when the rotating shaft 102 drives the signal disk 110 to rotate, the Hall sensors 112 adapted to the signal disk 110 can detect the rotation of the signal disk 110 and feedback the rotation speed and rotation direction information of the rotating shaft 102 to the control system of the lawn mower through the circuit board 113 and the signal line 114. In this way, the operator can control the operation components such as the joystick, the accelerator pedal, or the brake pedal to control the power supply magnitude and direction of the motor, and then control the movement of the lawn mower. Here, the Hall sensors 112 adapted to the signal disk 110 work together. On the one hand, it can enable the operator to obtain the rotation speed information and torque magnitude and other information of the rotating shaft 102 in a timely manner. On the other hand, it realizes the closed-loop control of the operation of the motor, which is beneficial to further improving the use flexibility of the rear-wheel servo drive assembly for the lawn mower in this embodiment.

[0039] In another embodiment of the present application, please refer to Figures 1 to 3 , the receiving cavity 109 includes a coaxial first cavity 115 and a second cavity 116, and the rear end cover 106 forms a step 117 for abutting against the adjusting disk 111 at the adjacent position of the first cavity 115 and the second cavity 116; a plurality of mounting holes 118 around the central axis of the rotating shaft 102 are formed on the step 117, and a plurality of waist-shaped holes 119 corresponding to the mounting holes 118 are provided on the adjusting disk 111, and the waist-shaped holes 119 extend along the circumferential direction of the adjusting disk 111. According to the above structure provided in this embodiment, through the plurality of mounting holes 118 provided on the step 117 and the plurality of waist-shaped holes 119 provided on the adjusting disk 111, the adjusting disk 111 can be more stably installed inside the receiving cavity 109, and the adjusting disk 111 can flexibly rotate around its own central axis and complete the reference phase calibration with the signal disk 110, which is beneficial to further improving the use flexibility of the rear-wheel servo drive assembly for the lawn mower in this embodiment.

[0040] In another embodiment of the present application, please refer toFigures 1 to 3 , on the side of the adjustment disk 111 close to the signal disk 110, a convex ring 120 is formed which protrudes towards the signal disk 110 and is coaxial with the rotating shaft 102. A plurality of accommodation grooves 121 for accommodating the Hall sensor 112 are formed on the convex ring 120; a third cavity 122 for accommodating the convex ring 120 is formed on the signal disk 110. According to the above structure provided in this embodiment, the Hall sensor 112 is arranged on the convex ring 120 and can be closer to the signal disk 110, which is beneficial to obtaining more accurate rotational speed information of the rotating shaft 102 and is beneficial to further improving the usage flexibility of the rear-wheel servo drive assembly for the lawn mower in this embodiment.

[0041] In another embodiment of the present application, please refer to Figures 1 to 3 , the motor 100 further includes a stator 123 coaxially arranged with the rotor 101, a plurality of winding coils 124 connected to the stator 123 around the central axis of the stator 123, and a plurality of permanent magnet tiles 125 connected to the rotor 101 around the central axis of the rotor 101; 12 permanent magnet tiles 125 are provided, and the number of winding coils 124 corresponds to the number of permanent magnet tiles 125. According to the above structure provided in this embodiment, providing 12 permanent magnet tiles 125 can significantly improve the response timeliness of the rotor 101 to the winding coils 124, which is beneficial to further improving the usage flexibility of the rear-wheel servo drive assembly for the lawn mower in this embodiment. It can be understood that the motor 100 in this embodiment further includes a power line 126 for supplying power to the winding coils 124, so that the winding coils 124 can generate the required magnetic force magnitude and magnetic field direction under the control of the control system of the lawn mower to drive the rotor 101 to rotate, which will not be elaborated here.

[0042] In another embodiment of the present application, please refer to Figures 1 to 3 , the number of magnetic monomers is a non-zero integer multiple of the number of permanent magnet tiles 125, and 3 Hall sensors 112 are provided. According to the above structure provided in this embodiment, the signal disk 110 and the Hall sensors 112 can form a more precise cooperation, which is beneficial to obtaining more accurate rotational speed information of the rotating shaft 102 and is beneficial to further improving the usage flexibility of the rear-wheel servo drive assembly for the lawn mower in this embodiment.

[0043] In another embodiment of the present application, please refer to Figures 1 to 3 , the motor 100 further includes a cover plate 127 detachably connected to the rear end cover 106 and used for closing the accommodation cavity 109. According to the above structure provided in this embodiment, on the one hand, the cover plate 127 can prevent dust and other impurities from entering the accommodation cavity 109, and on the other hand, it can be quickly disassembled to enable the operator to conveniently maintain the components in the accommodation cavity 109, which is beneficial to further improving the usage flexibility of the rear-wheel servo drive assembly for the lawn mower in this embodiment.

[0044] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A rear wheel servo drive assembly for a lawn mower, characterized in that: include: A motor (100) comprising a coaxially connected rotor (101) and a rotating shaft (102), wherein the rotor (101) is formed with a plurality of through cavities (103) extending along its axial direction, and the plurality of through cavities (103) are evenly distributed around the central axis of the rotating shaft (102); A reducer (200) having an input shaft (201) for inputting power and an output shaft (202) for outputting power, wherein the input shaft (201) and the output shaft (202) are parallel to each other and the input shaft (201) is coaxially connected to the rotating shaft (102); The wheel hub (300) is coaxially connected to the output shaft (202).

2. The rear wheel servo drive assembly for a lawn mower according to claim 1, characterized in that: The motor (100) further comprises a motor housing, and the reducer (200) further comprises a reducer housing (203), wherein the motor housing is detachably connected to the reducer housing (203); An inner spline groove (104) is coaxially arranged on the rotating shaft (102), and an outer spline (204) is coaxially arranged on the input shaft (201); the inner spline groove (104) and the outer spline (204) are arranged to be nested with each other.

3. The rear wheel servo drive assembly for a lawn mower according to claim 2, characterized in that: The motor housing comprises a front end cover (105) and a rear end cover (106) which are arranged at an interval, and also comprises an outer shell (107) connected between the front end cover (105) and the rear end cover (106); The front end cover (105) and the rear end cover (106) are respectively connected to bearings (108) coaxially sleeved on the rotating shaft (102).

4. The rear wheel servo drive assembly for a lawn mower according to claim 3, characterized in that: The rear end cover (106) is recessed on a side facing away from the front end cover (105) to form an accommodation cavity (109), and the rotating shaft (102) passes through the rear end cover (106) and extends into the accommodation cavity (109); The motor (100) further comprises a signal disk (110) coaxially connected to the rotating shaft (102) and an adjustment disk (111) coaxially with the rotating shaft (102) and arranged at intervals; a plurality of magnetic monomers uniformly distributed around the rotating shaft (102) are embedded inside the signal disk (110); the adjustment disk (111) is connected to a plurality of Hall sensors (112) uniformly distributed around the rotating shaft (102) and used to cooperate with the magnetic monomers to detect the rotation speed of the rotating shaft (102); the motor (100) further comprises a circuit board (113) electrically connected to the Hall sensor (112) and a signal line (114) electrically connected to the circuit board (113); the signal disk (110), the adjustment disk (111), the Hall sensor (112), and the circuit board (113) are all located inside the accommodating cavity (109).

5. The rear wheel servo drive assembly for a lawn mower according to claim 4, characterized in that: The accommodating cavity (109) comprises a coaxial first cavity (115) and a second cavity (116); the rear end cover (106) forms a step (117) at the junction of the first cavity (115) and the second cavity (116) for abutting against the adjusting disk (111); A plurality of mounting holes (118) are formed on the step (117) around the central axis of the rotating shaft (102), and a plurality of waist-shaped holes (119) corresponding to the mounting holes (118) are provided on the adjusting disk (111), and the waist-shaped holes (119) extend along the circumference of the adjusting disk (111).

6. The rear wheel servo drive assembly for a lawn mower according to claim 5, characterized in that: A convex ring (120) is formed on a side of the adjustment disk (111) close to the signal disk (110) and is protruding toward the signal disk (110) and is coaxial with the rotating shaft (102); a plurality of accommodating grooves (121) for accommodating the Hall sensor (112) are formed on the convex ring (120); A third cavity (122) for accommodating the convex ring (120) is formed on the signal disk (110).

7. The rear wheel servo drive assembly for a lawn mower according to claim 4, characterized in that: The motor (100) further comprises a stator (123) coaxially arranged with the rotor (101), a plurality of winding coils (124) connected to the stator (123) around a central axis of the stator (123), and a plurality of permanent magnet tiles (125) connected to the rotor (101) around a central axis of the rotor (101); Twelve permanent magnet tiles (125) are provided, and the number of winding coils (124) corresponds to the number of permanent magnet tiles (125).

8. The rear wheel servo drive assembly for a lawn mower according to claim 7, characterized in that: The number of the magnetic monomers is a non-zero integer multiple of the number of the permanent magnetic tiles (125), and three Hall sensors (112) are provided.

9. The rear wheel servo drive assembly for a lawn mower according to claim 4, characterized in that: The motor (100) further comprises a cover plate (127) detachably connected to the rear end cover (106) and used to close the accommodating cavity (109).

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