Self-locking differential, gearbox and mower

Abstract

The utility model relates to the field of vehicle, more particularly to a kind of self-locking differential, gearbox and mower.The self-locking differential includes differential gear and two suit components, each suit component includes supporting ring and multiple rolling elements, supporting ring is provided with multiple accommodating grooves, and each rolling element is accommodated in one accommodating groove;Two supporting rings are coaxially arranged in the inside of differential gear, and two supporting rings are rotatably matched;Two supporting rings and rolling element are movably matched with differential gear, and at least have first position and second position;Each supporting ring is provided with at least one first limiting part and at least one second limiting part;First limiting part cooperates with the second limiting part of another supporting ring, and is spaced or abuts with the first limiting part of another supporting ring;Wherein, when rolling element is in first position, self-locking differential locks;When rolling element is in second position, self-locking differential is unlocked.

Description

Technical Field

[0001] This utility model relates to the field of vehicles, and more specifically, to a self-locking differential, a gearbox, and a lawnmower. Background Technology

[0002] A self-locking differential is a special type of differential that can limit or eliminate the speed difference between the two wheels under specific conditions. It allows the wheels to rotate at different speeds when cornering, while preventing all power from being lost to the spinning wheel when one wheel loses traction; thus improving the vehicle's traction and handling, and reducing wheel wear.

[0003] The inventors discovered that existing self-locking differentials have complex structures, numerous parts, complex assembly, and are prone to wear, making it difficult to guarantee assembly precision. Utility Model Content

[0004] The purpose of this utility model is to provide a self-locking differential, a gearbox, and a lawnmower, which optimizes the structure, facilitates assembly, improves assembly accuracy, reduces the fit between structures, and lowers the wear rate of the structure.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, this utility model provides a self-locking differential, comprising:

[0007] Differential gears;

[0008] Two sets of components, each used for transmission engagement with a driveshaft; the axes of the differential gear, the sets of components, and the driveshaft coincide;

[0009] Each kit component includes a support ring and multiple rolling elements. The support ring is provided with multiple receiving slots, and each rolling element is received in one receiving slot.

[0010] Two support rings are coaxially disposed inside the differential gear, and the two support rings are rotatably engaged; the two support rings and the rolling elements are movably engaged with the differential gear, and have at least a first position and a second position;

[0011] Each support ring is provided with at least one first limiting part and at least one second limiting part; the first limiting part cooperates with the second limiting part of another support ring, and is spaced apart from or abuts against the first limiting part of another support ring;

[0012] Specifically, when the rolling element is in the first position, the self-locking differential is locked; when the rolling element is in the second position, the self-locking differential is unlocked.

[0013] In an optional embodiment, the first limiting part includes a limiting protrusion, and the second limiting part includes a limiting groove; the limiting protrusion engages with the limiting groove of another supporting sleeve, and is spaced apart from or abuts against the limiting protrusion of the other supporting sleeve.

[0014] In an optional embodiment, there are multiple first limiting parts and multiple second limiting parts; one first limiting part and one second limiting part are arranged between each pair of adjacent receiving slots;

[0015] The multiple receiving grooves of one support ring correspond one-to-one with the multiple receiving grooves of another support ring; the axes of the corresponding two receiving grooves coincide and the groove openings are set opposite each other.

[0016] In an optional embodiment, each assembly further includes a connecting ring, with a support ring fitted onto the connecting ring, the connecting ring being used to engage the drive rod;

[0017] The rolling element and the connecting ring are movably fitted together;

[0018] The connecting collar is provided with at least one abutment, which is located at the opening of multiple receiving slots and is used to block the multiple receiving slots.

[0019] In an optional embodiment, a plurality of clearance grooves are provided on the inner side of the differential gear, and two abutment parts are respectively arranged on both sides of the groove opening of each clearance groove.

[0020] When the self-locking differential is in the locked state, the rolling element abuts against a support part; when the self-locking differential is in the unlocked state, the rolling element is located in the clearance groove.

[0021] In an optional embodiment, the abutment is arranged in a ring along a direction perpendicular to the axis of the connecting collar.

[0022] In an optional implementation, the shortest distance from the connecting ring to the bottom of the clearance groove is greater than the diameter of the rolling element;

[0023] The shortest distance from the connecting ring to the abutment is less than the diameter of the rolling element.

[0024] In an optional embodiment, the kit further includes a friction plate, which is fitted onto the connecting collar and abuts against the supporting collar.

[0025] The friction plate is provided with a positioning part, which is housed in a receiving groove.

[0026] In a second direction, the present invention provides a gearbox, including at least one of the aforementioned self-locking differentials.

[0027] Thirdly, this utility model provides a lawnmower, including the aforementioned self-locking differential.

[0028] The beneficial effects of the self-locking differential, gearbox, and lawnmower provided in this embodiment of the invention include:

[0029] The self-locking differential includes a differential gear and two assembly components, each assembly component being used to drive a transmission rod; the axes of the differential gear, the assembly components, and the transmission rod are coincident; each assembly component includes a support ring and multiple rolling elements, the support ring having multiple receiving grooves, each rolling element being received in one receiving groove; the two support rings are coaxially disposed inside the differential gear, and the two support rings are rotatably engaged; both support rings and rolling elements are movably engaged with the differential gear, and have at least a first position and a second position; each support ring has at least one first limiting part and at least one second limiting part; the first limiting part engages with the second limiting part of the other support ring, and is spaced apart from or abuts against the first limiting part of the other support ring; wherein, when the rolling element is in the first position, the self-locking differential is locked; when the rolling element is in the second position, the self-locking differential is unlocked.

[0030] This self-locking differential allows for switching between locking and unlocking through the movable engagement between a rolling element housed in a receiving slot and a differential gear. When the rolling element moves from the first position to the second position, the self-locking differential switches from the locked state to the unlocked state; when the rolling element moves from the second position to the first position, the self-locking differential switches from the unlocked state to the locked state. This self-locking differential enables the lawnmower to switch between differential and non-differential states, and its optimized structure improves assembly precision and ease of use.

[0031] This self-locking differential, by incorporating a first and second limiting part, utilizes the cooperation between these two limiting parts to limit the relative position between the two support rings. This prevents one support ring from rotating excessively relative to the other, thus avoiding the differential failing to transition between unlocked and locked states due to excessive rotation. Furthermore, the simple structure of the first and second limiting parts optimizes the design, facilitates assembly, improves assembly precision, and reduces the number of mating parts, thereby lowering the wear rate. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the differential provided in this embodiment;

[0034] Figure 2 This is an exploded view of the differential provided in this embodiment;

[0035] Figure 3 for Figure 1 Cross-sectional view at point AA;

[0036] Figure 4 for Figure 3 A magnified view of a section at point B in the middle;

[0037] Figure 5 This is a cross-sectional view of the differential provided in this embodiment;

[0038] Figure 6 for Figure 5 A magnified view of a section at point C;

[0039] Figure 7 This is an exploded view of the kit components provided in this embodiment;

[0040] Figure 8 This is a schematic diagram of the structure of the two kit components provided in this embodiment;

[0041] Figure 9 This is a schematic diagram of the support ring provided in this embodiment;

[0042] Figure 10 for Figure 8 A magnified view of a section at point D;

[0043] Figure 11 An exploded view of the first and second ring assembly provided in the embodiments of this utility model.

[0044] Icons: 100-Self-locking differential; 110-Differential gear; 111-Relief groove; 112-Supporting part; 120-Assembly assembly; 121-Supporting ring; 1211-Accommodating groove; 1212-First limiting part; 1213-Second limiting part; 1214-Limiting protrusion; 1215-Limiting groove; 122-Rolling element; 123-Connecting ring; 1231-Supporting part; 124-Friction pad; 1241-Positioning part; 125-Elastic retaining ring; 126-Mounting pressure block; 127-First wave washer; 130 - Bushing; 140 - Second wave washer; 150 - Anti-friction pad; 160 - Housing; 170 - Rivet; 120a - First assembly; 121a - First support collar; 1211a - First receiving groove; 1214a - First limiting protrusion; 1215a - First limiting groove; 122a - First rolling element; 120b - Second assembly; 121b - Second support collar; 1211b - Second receiving groove; 1214b - Second limiting protrusion; 1215b - Second limiting groove; 122b - Second rolling element. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0047] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0048] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0049] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0050] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0051] Please refer to Figures 1-7 , Figure 1 This is a schematic diagram of the differential provided in this embodiment; Figure 2 This is an exploded view of the differential provided in this embodiment; Figure 3 for Figure 1 Cross-sectional view at point AA;

[0052] Figure 4 for Figure 3 A magnified view of a section at point B in the middle; Figure 5 This is a cross-sectional view of the differential provided in this embodiment;

[0053] Figure 6 for Figure 5 A magnified view of a section at point C; Figure 7 This is an exploded view of the kit component 120 provided in this embodiment.

[0054] This utility model provides a lawnmower, which includes multiple drive rods and a gearbox. The gearbox includes at least one self-locking differential 100. The self-locking differential 100 includes a differential gear 110 and two assembly components 120, each assembly component 120 being used to drive a drive rod. The axes of the differential gear 110, the assembly components 120, and the drive rods are coincident. In this embodiment, the gearbox can be a hydraulic gearbox; in other embodiments, the gearbox can be other types of gearboxes.

[0055] It should be noted that one end of the transmission rod is sleeved with the assembly 120, and the other end of the transmission rod is sleeved with the wheel. During the lawnmower's operation, the motor drives the differential gear 110, which transmits the driving force sequentially to the assembly 120, the transmission rod, and the wheel, thereby causing the wheel to rotate and propelling the lawnmower forward or backward.

[0056] Each assembly 120 includes a support ring 121, with two support rings 121 coaxially and oppositely disposed inside the differential gear 110; the two support rings 121 and the rolling element 122 are movably engaged with the differential gear 110. The axes of the drive rod, the support rings 121, and the differential gear 110 coincide.

[0057] Each assembly 120 includes a support ring 121 and multiple rolling elements 122. The support ring 121 is provided with multiple receiving slots 1211, and each rolling element 122 is received in one receiving slot 1211. Two support rings 121 are coaxially disposed inside the differential gear 110, and the two support rings 121 are rotatably engaged. The two support rings 121 and the rolling elements 122 are movably engaged with the differential gear 110, and have at least a first position and a second position. When the rolling element 122 is in the first position, the self-locking differential 100 is locked; when the rolling element 122 is in the second position, the self-locking differential 100 is unlocked.

[0058] In this embodiment, at least one clearance groove 111 is provided on the inner side of the differential gear 110, and abutment portions 112 are provided on both sides of the groove opening of the clearance groove 111; each assembly 120 includes multiple rolling elements 122, and the support ring 121 is provided with multiple receiving grooves 1211, in which the rolling elements 122 are received; wherein, when the self-locking differential 100 is in the locked state, the rolling element 122 abuts against a abutment portion 112; when the self-locking differential 100 is in the unlocked state, the rolling element 122 is located in the clearance groove 111.

[0059] Therefore, in this embodiment, the movable engagement between the rolling element 122 and the differential gear 110, and the reciprocating movement of the rolling element 122 between the supporting portion 112 and the clearance groove 111, allows the self-locking differential 100 to switch between a locked state and an unlocked state, thereby enabling the lawnmower to have both differential and non-differential states, which is beneficial for the lawnmower's operation. This embodiment optimizes the structure of the self-locking differential 100 to improve the assembly accuracy and convenience of the self-locking differential 100.

[0060] The working principle of the self-locking differential 100 in the lawnmower provided in this embodiment is as follows:

[0061] Understandably, when a lawnmower is traveling in a straight line, it needs to cut the grass. If the lawnmower deviates at this time, it may cause the cutting direction of the blades on the lawnmower to change, thereby causing a safety accident. Therefore, in this embodiment, during the lawnmower's straight-line travel, the self-locking differential 100 is in a locked state, that is, at this time the rolling element 122 abuts against the supporting part 112, thereby causing the two opposing wheels to rotate at the same speed, so that the lawnmower can travel in a straight line, thereby improving the stability of travel and the efficiency of cutting grass, and ensuring the safety of people around during the cutting process.

[0062] Then, when the lawnmower needs to turn, it needs to be switched from non-differential mode to differential mode, which requires switching the self-locking differential 100 from locked mode to unlocked mode.

[0063] It should be noted that lawnmowers are typically rear-wheel drive; therefore, a self-locking differential 100 is installed on the rear axle of the lawnmower to lock or unlock the rear wheels. The front wheels turn under the control of the steering wheel to make turns. The rear wheels move in the same direction as the front wheels, meaning the rear wheels turn together. This results in different resistances on the two rear wheels. Due to the different resistances on the two wheels connected to the self-locking differential 100, the rolling element 122 on one of the support rings 121 moves from the abutment part 112 into the clearance groove 111, thereby switching from the locked state to the unlocked state. The lawnmower switches from a non-differential state to a differential state, enabling turning.

[0064] During the turn, one support collar 121 rotates while the other support collar 121 does not rotate, thus creating a situation where one is unlocked and the other is locked.

[0065] After completing the turn, the lawnmower continues to travel in a straight line. At this time, the resistance experienced by both wheels is the same, and the rolling element 122 moves from the clearance groove 111 to the abutment part 112, causing the self-locking differential 100 to change from the unlocked state to the locked state.

[0066] Based on the above, please refer to... Figures 1-8 In this embodiment, multiple clearance slots 111 are arranged in a ring array around the axis of the differential gear 110; multiple receiving slots 1211 are arranged in a ring array around the axis of the support ring 121.

[0067] Specifically, since the axes of the differential gear 110 and the support ring 121 coincide, multiple clearance grooves 111 and multiple receiving grooves 1211 are arranged in a ring array around the same axis. In addition, each clearance groove 111 is equipped with two abutment parts 112, that is, an abutment part 112 is provided between two adjacent clearance grooves 111.

[0068] When the self-locking differential 100 is in the locked state, each rolling element 122 abuts against a supporting part 112; when the self-locking differential 100 is in the unlocked state, each rolling element 122 is located in a relief groove 111.

[0069] Understandably, the multiple rolling elements 122 and multiple receiving slots 1211 correspond one-to-one. When the self-locking differential 100 is in the locked or unlocked state, each rolling element 122 corresponds to a supporting part 112 or a clearance slot 111. Thus, when the self-locking differential 100 switches from the locked state to the unlocked state, all the rolling elements 122 on a support ring 121 move clockwise or counterclockwise synchronously from the supporting part 112 to the corresponding clearance slot 113. This prevents part of the support ring 121 from still abutting against the differential gear 110, causing incoordination during turns, thereby improving driving convenience. It should be noted that when turning, only one support ring 121 needs to be unlocked; the other support ring 121 will not rotate and will remain locked.

[0070] In this embodiment, the plurality of receiving grooves 1211 of one support collar 121 correspond one-to-one with the plurality of receiving grooves 1211 of another support collar 121; the axes of the corresponding two receiving grooves 1211 coincide and the groove openings are arranged opposite each other.

[0071] When the lawnmower moves straight, the two support rings 121 rotate synchronously, and the axes of the corresponding two receiving grooves 1211 coincide. This ensures that the rolling elements 122 in the two receiving grooves 1211 move synchronously to the clearance groove 111 or the abutment part 112, thereby preventing one support ring 121 from being locked while the other is unlocked during straight movement, thus avoiding interference with the normal operation of the lawnmower.

[0072] In other embodiments, if the inner wall of the differential gear 110 is divided into two parts, and the clearance grooves 111 and the abutment portions 112 on the two parts are staggered, then the axes of the corresponding two receiving grooves 1211 do not coincide.

[0073] Further, please refer to Figures 1-10 , Figure 8 This is a schematic diagram of the structure of the two kit components 120 provided in this embodiment; Figure 9 This is a schematic diagram of the structure of the support collar 121 provided in this embodiment; Figure 10 for Figure 8 A magnified view of a section at point D.

[0074] In this embodiment, each support collar 121 is provided with at least one first limiting part 1212 and at least one second limiting part 1213; the first limiting part 1212 cooperates with the second limiting part 1213 of another support collar 121, and is spaced apart from or abuts against the first limiting part 1212 of another support collar 121.

[0075] Specifically, the first limiting part 1212 includes a limiting protrusion 1214, and the second limiting part 1213 includes a limiting groove 1215; the limiting protrusion 1214 cooperates with the limiting groove 1215 of the other supporting sleeve 121, and is spaced apart from or abuts against the limiting protrusion 1214 of the other supporting sleeve 121.

[0076] It should be noted that the limiting protrusion 1214 can be set to the support collar 121 by welding or by integral molding. The limiting protrusion 1214 can also be set to the support collar 121 by a detachable connection.

[0077] Each support collar 121 is provided with multiple limiting protrusions 1214 and multiple limiting grooves 1215; between each pair of adjacent receiving grooves 1211, there is a limiting protrusion 1214 and a limiting groove 1215.

[0078] Multiple receiving grooves 1211 on one support collar 121 correspond one-to-one with multiple receiving grooves 1211 on another support collar 121, and the axes of the corresponding two receiving grooves 1211 coincide and the groove openings are arranged opposite each other. It can be understood that when the two support collars 121 are assembled together, there are two limiting protrusions 1214 and two limiting grooves 1215 between two adjacent receiving grooves 1211 of each support collar 121.

[0079] Please refer to Figure 5 , Figure 6 as well as Figure 11 , Figure 11 An exploded view of the first and second ring assembly provided in the embodiments of this utility model.

[0080] The two ring assemblies in this embodiment are divided into a first set assembly 120a and a second set assembly 120b. The first set assembly 120a includes a first support ring 121a and a plurality of first rolling elements 122a, and the second set assembly 120b includes a second support ring 121b and a plurality of second rolling elements 122b.

[0081] The first support collar 121a has multiple first receiving grooves 1211a, multiple first limiting protrusions 1214a, and multiple first limiting grooves 1215a arranged around its axis; the second support collar 121b has multiple second receiving grooves 1211b, multiple second limiting protrusions 1214b, and multiple second limiting grooves 1215b arranged around its axis. A first limiting protrusion 1214a and a first limiting groove 1215a are disposed between every two adjacent first receiving grooves 1211a; a second limiting protrusion 1214b and a second limiting groove 1215b are disposed between every two adjacent second receiving grooves 1211b; the first receiving grooves 1211a are used to receive the first rolling element 122a, and the second receiving grooves 1211b are used to receive the second rolling element 122b.

[0082] In this embodiment, each limiting protrusion 1214 is engaged with a limiting groove 1215 of another support collar 121, and is spaced apart from the limiting protrusion 1214 of the adjacent other support collar 121.

[0083] Understandably, each first limiting protrusion 1214a mates with a second limiting groove 1215b, and each second limiting protrusion 1214b mates with a first limiting groove 1215a.

[0084] Furthermore, the first support collar 121a and the second support collar 121b are rotatably engaged. Specifically, when the first support collar 121a and the second support collar 121b are fixed, the first limiting protrusion 1214a and the adjacent second limiting protrusion 1214b are spaced apart; when the first support collar 121a and the second support collar 121b rotate relative to each other, a portion of the first limiting protrusion 1214a and a portion of the second limiting protrusion 1214b abut against each other.

[0085] It should be noted that during the straight-line movement of the lawnmower, the two support rings 121 rotate synchronously, with the first limiting protrusion 1214a and the second limiting protrusion 1214b spaced apart.

[0086] However, when the lawnmower falls into the pit, one wheel is in the pit while the other wheel is suspended in the air. Because the suspended wheel experiences less air resistance, the resistance experienced by the two wheels is inconsistent. Therefore, the support ring 121 connected to the suspended wheel will rotate relative to the other support ring 121. At this time, a portion of the first limiting protrusion 1214a and a portion of the second limiting protrusion 1214b abut against each other, and the distance between the other portion of the first limiting protrusion 1214a and the other portion of the second limiting protrusion 1214b increases.

[0087] The support ring 121 connected to the wheel in the pit does not rotate, therefore the rolling element 122 remains against the supporting part 112 and is in a locked state; while the rolling element 122 on the support ring 121 connected to the suspended wheel moves from the supporting part 112 to the clearance groove 111, thereby unlocking. As a result, one side of the wheel is locked while the other side is unlocked, causing the vehicle's driving force to be transmitted to the wheel in the pit, thereby achieving extrication.

[0088] After getting out of trouble, the lawnmower continues to travel in a straight line. At this time, the resistance experienced by the wheels on both sides is the same, and the rolling element 122 moves from the clearance groove 111 to the supporting part 112 again to be in a locked state.

[0089] In other embodiments, each support collar 121 is provided with a limiting protrusion 1214 and a limiting groove 1215; when two support collars 121 are engaged, the limiting protrusion 1214 engages with the limiting groove 1215 of the other support collar 121, and is spaced apart from the limiting protrusion 1214 of the other support collar 121. The number of limiting protrusions 1214 and limiting grooves 1215 can be adjusted according to actual conditions, and is not limited here.

[0090] In other embodiments, a limiting protrusion 1214 and two limiting grooves 1215 are provided between two adjacent receiving grooves 1211 of one support collar 121, while a limiting groove 1215 and two limiting protrusions 1214 are provided between two adjacent receiving grooves 1211 of another support collar 121.

[0091] In other embodiments, since the number of limiting protrusions 1214 and limiting grooves 1215 in the two adjacent receiving grooves 1211 of the two support rings 121 is different, the two support rings 121 need to be made using different molds.

[0092] In this embodiment, since the number of limiting protrusions 1214 and limiting grooves 1215 in the two adjacent receiving grooves 1211 of the two support rings 121 is the same, the two support rings 121 can be made using the same mold.

[0093] Further, please refer to Figures 1-10 Each assembly 120 also includes a connecting collar 123, a supporting collar 121 fitted onto the connecting collar 123, and the connecting collar 123 is used to fit the transmission rod; wherein, the rolling element 122 and the connecting collar 123 are movably engaged.

[0094] Specifically, in this embodiment, the axis of the receiving groove 1211 coincides with the axis of the supporting collar 121. However, the receiving groove 1211 extends through the groove in a direction perpendicular to its axis, allowing the rolling element 122 located within the receiving groove 1211 to contact the connecting collar 123. The connecting collar 123 supports the rolling element 122, preventing it from dislodging from the receiving groove 1211, and, in conjunction with the abutment portion 112, restricts the movement of the rolling element 122, thereby keeping the self-locking differential 100 in a locked state.

[0095] It should be noted that, please refer to Figure 6 The shortest distance from the connecting ring 123 to the bottom of the relief groove 111 is a1, and the diameter of the rolling element 122 is d, where a1 > d, thereby ensuring that the rolling element 122 has a certain amount of room to move when it moves to the relief groove 111, thus achieving the purpose of unlocking.

[0096] Please refer to Figure 6 The shortest distance from the connecting ring 123 to the abutment 112 is a2, and the diameter of the rolling element 122 is d, where a2 < d. This ensures that the movement of the rolling element 122 in a direction perpendicular to the axis is restricted, so that the rolling element 122 cannot move, thereby achieving the purpose of locking.

[0097] According to the above, in this embodiment, the connecting collar 123 is provided with a stop portion 1231. The stop portion 1231 is located at the opening of the receiving groove 1211 and is used to block the receiving groove 1211 to restrict the movement of the rolling element 122 in the axial direction of the receiving groove 1211 and prevent the rolling element 122 from leaving the receiving groove 1211.

[0098] In this embodiment, the abutment 1231 is arranged in a ring along a direction perpendicular to the axis of the connecting sleeve 123, thereby providing an abutment 1231 to restrict the movement of multiple rolling elements 122 in the axial direction of the receiving groove 1211.

[0099] In other embodiments, the blocking portion 1231 may also be fan-shaped, and there may be multiple such portions. The maximum distance between any two adjacent blocking portions 1231 is less than the diameter of the rolling element 122, thereby restricting the movement of the rolling element 122 in the axial direction of the corresponding receiving groove 1211. Even if the rolling element 122 rotates with the support ring 121, the blocking portion 1231 can still restrict the movement of the rolling element 122 in the axial direction of the corresponding receiving groove 1211.

[0100] The inner wall of the connecting collar 123 is provided with splines to drive the transmission rod gear, thereby reducing the torque and increasing the service life of the connecting collar 123.

[0101] Further, please refer to Figures 1-10In this embodiment, the kit assembly 120 also includes a friction plate 124, which is sleeved on the connecting ring 123 to increase friction and facilitate the ring 121 to rotate back and forth, thereby achieving the purpose of switching between locked and unlocked states.

[0102] In conjunction with the above structural configuration, the friction plate 124 is provided with a positioning part 1241, which is accommodated in the receiving groove 1211, and can position the installation position of the friction plate 124 to improve the convenience of assembly.

[0103] It should be noted that the positioning part 1241 is spaced apart from the inner wall of the receiving groove 1211 and the corresponding rolling element 122 to avoid affecting the movement of the rolling element.

[0104] Furthermore, the assembly 120 also includes a first wave washer 127, a mounting block 126, and an elastic retaining ring 125 sequentially fitted onto the connecting collar 123 along its axial direction. The first wave washer 127, the mounting block 126, and the elastic retaining ring 125 are all located on the side of the supporting collar 121 away from the other collar assembly.

[0105] In this embodiment, the first wave-shaped washer 127 is used to provide preload to ensure a tight fit between components. The mounting block 126 is used to fix the position of the differential, ensuring installation stability and improving assembly accuracy. The elastic retaining ring 125 is used to compress and limit the first wave-shaped washer 127.

[0106] Please refer to Figures 1-10 A bushing 130 and a second corrugated washer 140 are provided at the mating point of the two connecting sleeves 123. The bushing 130 and the second corrugated washer 140 are respectively fitted onto the two connecting sleeves 123 and fit snugly against each other. The bushing 130 is used to reduce the friction between the two connecting sleeves 123, prevent wear, and improve the service life of the connecting sleeves 123. The second corrugated washer is used to reduce the gap between the two connecting sleeves 123 in the axial direction, thereby achieving the purpose of vibration reduction.

[0107] It should be noted that in this embodiment, the volume of the first waveform collar is larger than the volume of the second waveform collar. In other embodiments, the volumes of the first and second waveform collars can be adjusted according to actual conditions.

[0108] After assembling the race assembly and differential gear 110, a housing 160 is used to surround the race assembly and differential gear 110 to protect them from damage caused by external interference. A friction-reducing pad 150 is placed between the housing 160 and the race assembly to reduce wear between components and extend their service life. Finally, rivets 170 are used to connect and secure the housing 160, race assembly, and differential gear 110 to complete the assembly.

[0109] In summary, the self-locking differential 100 includes a differential gear 110 and two assembly components 120, each assembly component 120 being used for transmission engagement with a transmission rod; the axes of the differential gear 110, the assembly components 120, and the transmission rod coincide; each assembly component 120 includes a support ring 121 and multiple rolling elements 122, the support ring 121 being provided with multiple receiving grooves 1211, and each rolling element 122 being received in one receiving groove 1211; the two support rings 121 are coaxially disposed inside the differential gear 110, and the two support rings 121 are rotatably engaged; the two support rings 121 are coaxially disposed inside the differential gear 110, and the two support rings 121 are rotatably engaged; the two support rings 121 are coaxially disposed inside the differential gear 110, and the two support rings 121 are coaxially ... Both the ring 121 and the rolling element 122 are movably engaged with the differential gear 110 and have at least a first position and a second position; each support ring 121 is provided with at least one first limiting part 1212 and at least one second limiting part 1213; the first limiting part 1212 engages with the second limiting part 1213 of another support ring 121 and is spaced apart from or abuts against the first limiting part 1212 of another support ring 121; wherein, when the rolling element 122 is in the first position, the self-locking differential 100 is locked; when the rolling element 122 is in the second position, the self-locking differential 100 is unlocked.

[0110] The self-locking differential 100, through the movable engagement between the rolling element 122 housed in the receiving groove 1211 and the differential gear 110, allows the self-locking differential 100 to switch between locked and unlocked states. When the rolling element 122 moves from the first position to the second position, the self-locking differential 100 switches from the locked state to the unlocked state; when the rolling element 122 moves from the second position to the first position, the self-locking differential 100 switches from the unlocked state to the locked state. This self-locking differential 100 enables the lawnmower to switch between differential and non-differential states, and through structural optimization, improves assembly accuracy and convenience.

[0111] The self-locking differential 100, by providing a first limiting part 1212 and a second limiting part 1213, utilizes the cooperation between the first limiting part 1212 and the second limiting part 1213 to limit the relative position between the two support rings 121. This prevents one support ring 121 from rotating too much relative to the other, thus avoiding the self-locking differential 100 failing to transition between the unlocked and locked states due to excessive rotation. Furthermore, the first limiting part 1212 and the second limiting part 1213 have a simple structure, thereby optimizing the structure, facilitating assembly, improving assembly accuracy, and reducing the number of mating relationships between structures, thus lowering the wear rate.

[0112] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A self-locking differential, characterized in that, include: Differential gear (110); Two assembly components (120), each of which is used for transmission engagement with a drive rod; the axes of the differential gear (110), the assembly components (120), and the drive rod coincide; Each of the assembly components (120) includes a support collar (121) and a plurality of rolling elements (122), the support collar (121) being provided with a plurality of receiving slots (1211), and each of the rolling elements (122) being received in one of the receiving slots (1211). The two support rings (121) are coaxially disposed inside the differential gear (110), and the two support rings (121) are rotatably engaged; the two support rings (121) and the rolling element (122) are all movably engaged with the differential gear (110), and have at least a first position and a second position; Each of the support collars (121) is provided with at least one first limiting part (1212) and at least one second limiting part (1213); the first limiting part (1212) cooperates with the second limiting part (1213) of another support collar (121) and is spaced apart from or abuts against the first limiting part (1212) of another support collar (121); When the rolling element (122) is in the first position, the self-locking differential (100) is locked; when the rolling element (122) is in the second position, the self-locking differential (100) is unlocked.

2. The self-locking differential according to claim 1, characterized in that, The first limiting part (1212) includes a limiting protrusion (1214), and the second limiting part (1213) includes a limiting groove (1215); the limiting protrusion (1214) cooperates with the limiting groove (1215) of the other supporting sleeve (121), and is spaced apart from or abuts against the limiting protrusion (1214) of the other supporting sleeve (121).

3. The self-locking differential according to claim 1, characterized in that, There are multiple first limiting parts (1212) and second limiting parts (1213); one first limiting part (1212) and one second limiting part (1213) are arranged between each two adjacent receiving slots (1211). The plurality of receiving grooves (1211) of one of the support sleeves (121) correspond one-to-one with the plurality of receiving grooves (1211) of another support sleeve (121); the axes of the corresponding two receiving grooves (1211) coincide and the groove openings are arranged opposite each other.

4. The self-locking differential according to any one of claims 1-3, characterized in that, Each of the said assembly components (120) also includes a connecting collar (123), the supporting collar (121) being fitted onto the connecting collar (123), the connecting collar (123) being used to engage the transmission rod; The rolling element (122) is movably engaged with the connecting sleeve (123); The connecting collar (123) is provided with at least one abutment (1231), which is located at the opening of the plurality of receiving grooves (1211) and is used to block the plurality of receiving grooves (1211).

5. The self-locking differential according to claim 4, characterized in that, The differential gear (110) has a plurality of clearance grooves (111) on its inner side, and two abutment parts (112) are respectively arranged on both sides of the groove opening of each clearance groove (111). When the self-locking differential (100) is in the locked state, the rolling element (122) abuts against one of the abutment portions (112); when the self-locking differential (100) is in the unlocked state, the rolling element (122) is located in the clearance groove (111).

6. The self-locking differential according to claim 5, characterized in that, The blocking part (1231) is arranged in a ring along a direction perpendicular to the axis of the connecting sleeve (123).

7. The self-locking differential according to claim 5, characterized in that, The shortest distance from the connecting ring (123) to the bottom of the clearance groove (111) is greater than the diameter of the rolling element (122); The shortest distance from the connecting ring (123) to the abutment (112) is less than the diameter of the rolling element (122).

8. The self-locking differential according to claim 5, characterized in that, The assembly (120) further includes a friction plate (124), which is fitted onto the connecting collar (123); the friction plate (124) is provided with a positioning part (1241), which is accommodated in the receiving groove (1211).

9. A gearbox, characterized in that, Includes at least one self-locking differential (100) as claimed in any one of claims 1-8.

10. A lawnmower, characterized in that, Including the gearbox as described in claim 9.

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