Differential self-propelled device of gardening tool and gardening tool

Abstract

The differential self-propelled device of the gardening tool comprises a machine shell, a motor and a transmission mechanism driven by the motor to move are arranged in the machine shell, the transmission mechanism comprises a driving wheel, a driven wheel and an idle wheel clutch assembly, and the driving wheel, the driven wheel and the idle wheel clutch assembly are matched in a linkage mode. The idle wheel clutch assembly is in meshing fit with the driving wheel and can move to be meshed with the driven wheel, the guide mechanism comprises a first guide body arranged on the machine shell and a second guide body arranged on the idle wheel clutch assembly, and the second guide body synchronously rotates along with the idle wheel clutch assembly and can move along the first guide body. Therefore, whether the idle wheel clutch assembly is meshed with the driven wheel or not is matched. According to the utility model, stable and smooth clutch and differential self-walking functions can be realized, slipping of the wheel body during turning is avoided, abrasion of the wheel body is reduced, and user experience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of garden tools, in particular to a differential self-propelled device of a garden tool and a corresponding garden tool. Background Art

[0002] At present, the existing garden machinery includes lawn mowers, rakes, snow blowers, etc., but most of the garden machinery is heavy. In order to use it more conveniently, a self-propelled device is installed in the garden machinery to reduce the burden of the user when pushing the lawn mower to cut grass. However, the self-propelled device of the current garden machinery can only provide driving force for the garden machinery, and its clutch function is complicated. When the forward speed of the garden machinery is greater than the driving speed, the drive motor in the self-propelled device will be reversed, causing the loss of the self-propelled device. Some existing garden machinery self-propelled devices will integrate automatic clutches in the transmission device, but traditional automatic clutches require control components, such as forks, etc. Once the control components fail, the automatic clutch will also fail, and the reliability is not high.

[0003] For example, the self-propelled garden machinery and garden machinery disclosed in Patent No. CN116171738A realize the clutch function through an idler clutch assembly and an elastic element. However, the service life of the elastic element is short, and it is difficult to ensure stable limiting and guiding movement. At the same time, there is no differential function, which makes it difficult to meet market demand. Utility Model Content

[0004] The utility model aims to avoid the deficiencies of the prior art and provides a differential self-propelled device of a garden tool with stable clutch and differential self-propelled functions and a corresponding garden tool.

[0005] The utility model solves the technical problem by adopting the following technical scheme: a differential self-propelled device for garden tools, comprising a housing, a motor and a transmission mechanism driven by the motor, the transmission mechanism comprising a driving wheel, a driven wheel and an idler clutch assembly that are linked and matched, the idler clutch assembly meshing with the driving wheel and being movable to mesh with the driven wheel, and also comprising a guide mechanism and a differential mechanism,

[0006] The guiding mechanism comprises:

[0007] A guide body 1 arranged on the casing;

[0008] A second guide body is arranged on the idler clutch assembly, wherein the second guide body rotates synchronously with the idler clutch assembly and can move along the first guide body, thereby coordinating whether the idler clutch assembly is meshed with the driven wheel;

[0009] The differential mechanism includes:

[0010] A right wheel shaft, the driven wheel is arranged on the right wheel shaft, and a differential right gear is also arranged on the right wheel shaft;

[0011] A left wheel shaft arranged coaxially with the right wheel shaft, wherein a differential left gear is arranged on the left wheel shaft;

[0012] A positioning sleeve locked on the driven wheel, and the positioning sleeve can support and position the right wheel shaft 71 and the left wheel shaft 73;

[0013] Two differential planetary gears are rotatably arranged in the positioning sleeve, and the differential planetary gears are meshed with the differential left gear and the differential right gear.

[0014] In several embodiments, the guide body 1 is bent and has a tooth body on one side, and the tooth body meshes with the guide body 2.

[0015] In several embodiments, the guide body 1 is rotatably disposed in the housing, an elastic body is disposed on the side of the guide body 1 facing away from the guide body 2, and the elastic body is disposed in the housing and is used to provide an elastic force to push the guide body 1 toward the guide body 2.

[0016] In several embodiments, a receiving groove and a pressing plate for closing the receiving groove are disposed at one end of the housing, and the receiving groove is used to configure a guide body and an elastic body.

[0017] In several embodiments, the idler clutch assembly includes an idler, an idler shaft and a slider, the idler and the slider are arranged on the idler shaft, and the guide body is sleeved at the end of the idler shaft.

[0018] In several embodiments, a short shaft is provided between the left axle and the right axle, and the left axle and the right axle are connected via the short shaft to achieve independent movement of the left axle and the right axle.

[0019] In several embodiments, the left wheel shaft and the right wheel shaft are both matched with the wheel body through a ratchet, and cylindrical pins are provided on the left wheel shaft and the right wheel shaft. The cylindrical pins are matched with the ratchet teeth on the ratchet to realize unidirectional movement.

[0020] The left wheel shaft and the right wheel shaft are both matched with the wheel body through a one-way bearing to achieve one-way movement.

[0021] And, a garden tool comprising the differential self-propelled device.

[0022] The utility model has the following beneficial effects:

[0023] 1. The utility model realizes stable guiding movement of the idler clutch assembly through the structure of the guiding mechanism, improves the smoothness and stability of clutch switching, and improves the user experience.

[0024] 2. The utility model combines the idler clutch mechanism with the differential mechanism, and can achieve two-wheel differential when the self-propelled device is started and the machine turns, thereby improving the user experience; when the self-propelled device is turned off, the internal motor can be prevented from being reversely dragged, and the two wheels can move forward / backward freely.

[0025] 3. The utility model can avoid reverse input of the force when the forward speed of the whole machine is greater than the motor driving speed through the structure of the one-way mechanism, thereby ensuring the safety of use and the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are for illustrative purposes only of selected embodiments and do not represent all possible implementations, and should not be considered to limit the scope of the present invention.

[0027] Figure 1 The partial separation structure of the differential self-propelled device in Embodiment 1 is schematically shown;

[0028] Figure 2 Schematically shows Figure 1 Partial explosion of structures;

[0029] Figure 3 Schematically shows Figure 2 The structure in which the center differential self-propelled gear is in a closed state;

[0030] Figure 4 Schematically shows Figure 3 A structure in another perspective;

[0031] Figure 5 Schematically shows Figure 2 The structure in which the center differential self-propelled gear is in the open state;

[0032] Figure 6 Schematically shows Figure 5 A structure in another perspective;

[0033] Figure 7 The exploded structure of the differential mechanism in Embodiment 1 is schematically shown;

[0034] Figure 8 The overall cross-sectional structure of the differential self-propelled device of Embodiment 1 is schematically shown;

[0035] Fig. 9 The overall structure of the garden tool in Example 1 is schematically shown;

[0036] Fig.10 Schematically shows Fig. 9 The matching structure between the middle right wheel axle and the wheel body. DETAILED DESCRIPTION

[0037] Below, the embodiments of the present invention are described in detail. In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments.

[0038] Therefore, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the present invention for protection, but merely represents selected embodiments of the present invention. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0039] The terms used herein are intended to explain the embodiments and are not intended to limit and / or define the present invention.

[0040] Example 1

[0041] like Figure 1-Figure 2 As shown, the differential self-propelled device in this embodiment conventionally includes a housing 10, in which a motor 20 and a transmission mechanism driven by the motor 20 are arranged, and the transmission mechanism includes a driving wheel 30, a driven wheel 40 and an idler clutch assembly that are linked and cooperated, and the idler clutch assembly is engaged with the driving wheel 30 and can be moved to engage with the driven wheel 40, and the idler clutch assembly includes an idler wheel 51, an idler shaft 52 and a slider 53, and the idler wheel 51 and the slider 53 are arranged on the idler shaft 52, thereby realizing the clutch transmission function between the driving wheel 30 and the driven wheel 40.

[0042] Specifically, it also includes a guiding mechanism, which includes a guiding body 1 61 of a rocker arm structure arranged on the housing 10; a guiding body 2 62 of a gear structure arranged on the idler clutch assembly, and the guiding body 2 62 rotates synchronously with the idler clutch assembly and can move along the guiding body 1 61, thereby coordinating the engagement of the idler clutch assembly with the driven wheel 40.

[0043] Among them, the guide body 1 61 is bent and a tooth body 611 is arranged on one side thereof, and its curved arc matches the movement path of the guide body 2 62. The tooth body 611 is meshed with the guide body 2 62, and the guide body 1 61 is rotatably arranged in the housing 10, one end of which is connected to the housing 10 through a rotating shaft, and an elastic body 63 is arranged on the side of the guide body 1 61 away from the guide body 2 62. The elastic body 63 is arranged in the housing 10 and is used to provide an elastic force to abut the guide body 1 61. The elastic body 63 can adopt a spring structure to push the guide body 1 61 toward the guide body 2 62 so that the two can effectively cooperate.

[0044] Furthermore, a receiving groove 11 and a pressing plate 12 for closing the receiving groove 11 are disposed at one end of the housing 10 . The receiving groove 11 is used to configure the first guide body 61 and the elastic body 63 .

[0045] like Figure 3-Figure 4 For ease of understanding, Figure 3 The figure of the guide body 61 and the elastic body 63 is added. At this time, the idler wheel 51 is only engaged with the driving wheel 30, and the force of the driving wheel 30 cannot be transmitted to the driven wheel 40, and the self-propelled function is in a closed state.

[0046] At the same time, when the self-propelled function is in the on state, the idler wheel 51 realizes transmission with the driving wheel 30 and the driven wheel 40.

[0047] Furthermore, when the self-propelled function changes from the off state to the on state, the guide body 2 62 rotates synchronously with the idler wheel 51, and through its meshing cooperation with the guide body 1 61, when the reaction force of the guide body 1 61 on the guide body 2 62 is greater than the resistance between the idler wheel clutch assembly and the housing 10, the entire idler wheel clutch assembly slides counterclockwise until it meshes with the driven wheel to achieve self-propelled.

[0048] Also, when the self-propelled function changes from the on state to the off state, the control motor 20 is reversed for 2-4s, and the idler clutch assembly slides clockwise under the force of the driven wheel until it separates from the driven wheel, interrupting the power transmission and preventing the motor from being pushed in the opposite direction. During this time period, the guide body 2 62 continues to rotate under the action of the driving wheel. During the flexible engagement of the guide body 2 62 and the guide body 1 61, the guide body 1 61 overcomes the elastic force of the elastic body 63 and rotates slightly in the counterclockwise direction, which can reduce the wear between the guide body 2 62 and the guide body 1 61.

[0049] Combination Figure 7-Figure 10 As shown, the differential self-propelled device also includes a differential mechanism arranged in the housing 10, and the differential mechanism includes: a right wheel axle 71, the driven wheel 40 is arranged on the right wheel axle 71, and the right wheel axle 71 is also provided with a differential right gear 72; a left wheel axle 73 coaxially arranged with the right wheel axle 71, and the left wheel axle 73 is provided with a differential left gear 74; a positioning sleeve 75 is screwed to form a whole with the driven wheel 40 and rotates therewith; two differential planetary gears 76 rotatably arranged in the positioning sleeve 75, and the differential planetary gears 76 are meshed with the differential left gear 74 and the differential right gear 72.

[0050] When the lawn mower moves forward in a straight line, the wheels 82 on both sides are subjected to the same force, and the differential planetary gear 76 follows the positioning sleeve 75 to rotate with the driven wheel 40, but does not rotate around its own axis. At this time, the differential left gear 74, the differential right gear 72, and the differential planetary gear 76 will rotate at the same speed as the driven wheel 40, and the torque will be transmitted to the differential left gear 74 and the differential right gear 72 and drive the left wheel shaft 73 and the right wheel shaft 71 to rotate, and finally the wheels 82 on both sides rotate at the same speed.

[0051] When the lawn mower turns, the turning radius of the inner wheel body is smaller than that of the outer wheel body, so the resistance of the inner wheel body is greater than that of the outer wheel body; at this time, the differential planetary gear not only rotates with the driven wheel and the positioning sleeve, but also rotates around its own axis; the power of the inner left differential gear will be distributed to the outer right differential gear through the rotation of the differential planetary gear. Compared with the inner left differential gear, the differential planetary gear will drive the outer right differential gear to rotate at a higher speed; finally, the speed of the right wheel body is greater than that of the left wheel body, realizing the differential.

[0052] Among them, a short shaft 77 is set between the left wheel shaft 73 and the right wheel shaft 71. The left wheel shaft 73 and the right wheel shaft 71 are connected by the short shaft 77 to realize the independent movement of the left wheel shaft 73 and the right wheel shaft 71, so that the left / right wheel shafts can rotate independently and flexibly in both directions when there is no power.

[0053] The left wheel shaft 73 and the right wheel shaft 71 are both driven by the ratchet 81 and the wheel body 82. A cylindrical pin 83 is provided on the left wheel shaft 73 and the right wheel shaft 71. The cylindrical pin 83 is driven by the ratchet teeth 84 on the ratchet 81 to achieve unidirectional movement. The transmission structure is consistent with the structure in the background technology and is not further described here. Of course, a one-way bearing structure can also be used. Through such a one-way transmission structure, when the forward speed of the wheel of the lawn mower is greater than the motor driving speed under the action of external force, the free forward movement of the wheel is achieved, and when the external force disappears, the motor resumes normal output.

[0054] At the same time, when the machine loses power abnormally / the battery pack is unplugged and the idler wheel is not separated from the driven wheel, pulling the machine backwards can reset the idler clutch assembly and achieve manual unlocking.

[0055] The examples shown in the utility model, the embodiments and special forms of the representation have been shown and described in detail in the drawings and the foregoing description, and should also be considered to be illustrative rather than restrictive. The description of special features in one embodiment does not mean that those special features are necessarily limited to that embodiment. The features of one embodiment can be used in combination with the features of other embodiments, which can be understood by those of ordinary skill in the art, whether or not explicitly described in this way. Exemplary embodiments have been shown and described, and all changes and improvements fall into the spirit of the utility model and are expected to be protected.

Claims

1. A differential self-propelled device for a garden tool, comprising a housing (10), wherein a motor (20) and a transmission mechanism driven by the motor (20) are arranged in the housing (10), wherein the transmission mechanism comprises a driving wheel (30), a driven wheel (40) and an idler clutch assembly which are in linkage, wherein the idler clutch assembly is meshed with the driving wheel (30) and can be moved to mesh with the driven wheel (40), wherein: It also includes a guiding mechanism and a differential mechanism. The guiding mechanism comprises: A guide body (61) disposed on the housing (10); A second guide body (62) is arranged on the idler clutch assembly, wherein the second guide body (62) rotates synchronously with the idler clutch assembly and can move along the first guide body (61), thereby coordinating whether the idler clutch assembly is meshed with the driven wheel (40); The differential mechanism comprises: A right wheel shaft (71), the driven wheel (40) is arranged on the right wheel shaft (71), and a differential right gear (72) is also arranged on the right wheel shaft (71); A left wheel shaft (73) coaxially arranged with the right wheel shaft (71), wherein a differential left gear (74) is arranged on the left wheel shaft (73); A positioning sleeve (75) locked on the driven wheel (40), wherein the positioning sleeve (75) can support and position the right wheel shaft (71) and the left wheel shaft (73); Two differential planetary gears (76) are rotatably arranged in the positioning sleeve (75), and the differential planetary gears (76) are meshed with the differential left gear (74) and the differential right gear (72).

2. A differential self-propelled device for garden tools according to claim 1, characterized in that: The guide body 1 (61) is bent and has a tooth body (611) on one side thereof, and the tooth body (611) is meshed with the guide body 2 (62).

3. A differential self-propelled device for garden tools according to claim 2, characterized in that: The guide body 1 (61) is rotatably arranged in the housing (10); an elastic body (63) is arranged on the side of the guide body 1 (61) facing away from the guide body 2 (62); the elastic body (63) is arranged in the housing (10) and is used to provide an elastic force to push the guide body 1 (61) toward the guide body 2 (62).

4. A differential self-propelled device for garden tools according to claim 3, characterized in that: A receiving groove (11) and a pressing plate (12) for closing the receiving groove (11) are provided at one end of the housing (10); the receiving groove (11) is used to configure a guide body (61) and an elastic body (63).

5. The differential self-propelled device for garden tools according to claim 4, characterized in that: The idler clutch assembly comprises an idler (51), an idler shaft (52) and a slider (53); the idler (51) and the slider (53) are arranged on the idler shaft (52); and the second guide body (62) is sleeved on the end of the idler shaft (52).

6. A differential self-propelled device for garden tools according to claim 5, characterized in that: A short shaft (77) is arranged between the left wheel shaft (73) and the right wheel shaft (71), and the left wheel shaft (73) and the right wheel shaft (71) are connected via the short shaft (77) to realize independent movement of the left wheel shaft (73) and the right wheel shaft (71).

7. The differential self-propelled device for garden tools according to claim 6, characterized in that: The left wheel shaft (73) and the right wheel shaft (71) are both driven and matched with the wheel body (82) through the ratchet (81), and cylindrical pins (83) are arranged on the left wheel shaft (73) and the right wheel shaft (71), and the cylindrical pins (83) are driven and matched with ratchet teeth (84) on the ratchet (81) to realize unidirectional movement.

8. The differential self-propelled device for garden tools according to claim 7, characterized in that: The left wheel shaft (73) and the right wheel shaft (71) are both matched with the wheel body (82) through a one-way bearing to achieve one-way movement.

9. A garden tool, characterized in that: A differential self-propelled device comprising a garden tool as claimed in any one of claims 1 to 8.

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