Differential lock structure for drive axle

Abstract

The differential lock structure for the drive axle comprises an axle housing body, a drive unit shell and a differential lock assembly, the drive unit shell is provided with differential meshing teeth, an air cylinder piece is used for driving a shifting fork shaft to move transversely, a main support is fixedly connected to the drive unit shell, and the differential lock assembly is arranged on the main support. The utility model relates to the technical field of differential locks, gas pushes the shifting fork shaft to move transversely and drives the shifting fork to move, the shifting fork pushes the meshing sleeve to be meshed with meshing teeth of a differential mechanism to be locked, and when gas filling is stopped, the shifting fork shaft is inserted into the through hole of the main support, and the meshing sleeve is connected with the bottom end of the shifting fork. The elastic potential energy of the elastic piece is used for pushing the shifting fork shaft to reset, the differential lock assembly is integrated into the axle housing body, the space of the axle housing body is fully used while the differential locking function is completed, and the space occupied by the external differential lock assembly is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to differential lock technical field especially is differential lock structure for drive axle. BACKGROUND

[0002] Differential lock is a kind of device that locks differential, when the drive wheel of vehicle slips and is in trouble, differential lock is locked, so that other drive wheels still obtain sufficient driving force to get out of trouble, and it has important role for truck, especially truck that travels on poor road.

[0003] Among them, with the development of new energy vehicles, most manufacturers choose to integrate motor and main reducer to form power unit, due to the integration of drive axle housing, reduction mechanism and heat dissipation system, the structure is complex, and the space is limited and cannot integrate differential lock structure. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of differential lock structure for drive axle, to solve the problem that drive axle housing space is limited and cannot integrate differential lock structure.

[0005] The utility model provides a kind of differential lock structure for drive axle, comprising:

[0006] bridge shell body, drive unit shell, differential lock assembly;

[0007] The differential lock assembly includes a cylinder, a main support, a shift fork shaft, a shift fork, a spring and a meshing sleeve.

[0008] The drive unit shell is provided with differential gear meshing teeth, the cylinder is located in the limiting groove of the bridge shell body, the cylinder is used to drive the shift fork shaft to move transversely, so that the meshing sleeve locks the differential gear meshing teeth, the main support is fixedly connected to the drive unit shell, the shift fork shaft is inserted into the through hole of the main support, the top end of the shift fork is assembled and connected with the shift fork shaft, the spring is sleeved on the shift fork shaft, the spring is located between the main support and the shift fork, the meshing sleeve is connected with the bottom end of the shift fork, the bridge shell body is provided with a half shaft, and the center hole of the meshing sleeve is inserted into the outer periphery of the half shaft.

[0009] Preferably, the cylinder includes a bushing, a sealing nut, a gas pipe joint and a position sensor.

[0010] The bushing is located in the clamping groove of the bridge shell body, the sealing nut is used to close the end of the bushing away from the shift fork shaft, the gas pipe joint is fixedly connected in the through hole of the bridge shell body, the gas outlet end of the gas pipe joint is communicated with the bushing, and the position sensor is fixedly connected in the center hole of the sealing nut.

[0011] The front end groove of the fork shaft is sleeved with a sealing ring, and the piston part of the cylinder part is formed.

[0012] Preferably, the sealing nut can also be replaced by a sealing end cover, the air pipe joint can also be installed in the through hole of the sealing end cover, and the air outlet end of the air pipe joint is communicated with the bushing.

[0013] Preferably, the outer periphery of the fork shaft is threadedly connected with an adjusting nut, the adjusting nut is located between the fork shaft and the main support, the outer periphery of the adjusting nut is threadedly connected with a locking nut, and the locking nut is used for locking the adjusting nut.

[0014] Preferably, the cylinder part can also be replaced by a driving part.

[0015] The driving part comprises a connecting plate, a cylinder and a fixed end cover.

[0016] The connecting plate and the outer periphery of the axle housing body are fixedly connected, the top end of the cylinder is fixedly connected with the connecting plate, the cylinder is located in the groove of the axle housing body, the air outlet end of the air pipe joint is communicated with the cylinder, the fixed end cover is located at the opening end of the cylinder, the fork shaft is inserted into the center hole of the fixed end cover, the elastic member is coaxially arranged in the cavity of the cylinder, and the end, away from the cylinder, of the fork shaft is connected with the fork.

[0017] Preferably, the connecting plate and the cylinder are integrally formed.

[0018] Preferably, the tooth groove of the engaging sleeve is matched with the teeth of the differential gear.

[0019] Preferably, the fork is Y-shaped.

[0020] Preferably, the elastic member is a compression spring.

[0021] Preferably, the sealing ring is made of fluorine rubber material.

[0022] The utility model provides a differential lock structure for drive axle:

[0023] Through cooperation of the gas cylinder piece, the main support, the shift fork shaft, the shift fork, the elastic piece and the engaging sleeve, the gas drives the shift fork shaft to move horizontally and drives the shift fork to move, the elastic piece is compressed by the shift fork, the shift fork drives the engaging sleeve to engage with the differential gear engaging tooth to lock, when the gas is stopped to be filled, the elastic potential energy of the elastic piece is used to drive the shift fork shaft to reset, and the shift fork shaft drives the shift fork and the engaging sleeve to reset, and the unlocking is completed, through integration of the differential lock assembly into the inside of the axle housing body, while the differential locking function is completed, the space of the axle housing body is fully used, and the space occupied by the external differential lock assembly is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 It is a structural schematic diagram of the present application;

[0026] Figure 2 It is a structural schematic diagram of the present application; Figure 1 It is a sectional view of the axle housing body;

[0027] Figure 3 It is a structural schematic diagram of the present application; Figure 2 It is a structural schematic diagram of the present application;

[0028] Figure 4 It is a structural schematic diagram of the present application; Figure 1 It is a structural schematic diagram of the present application;

[0029] Figure 5 It is a structural schematic diagram of the present application; Figure 4 It is a structural schematic diagram of the present application;

[0030] Figure 6 It is a structural schematic diagram of the present application; Figure 2 It is a structural schematic diagram of the present application;

[0031] Figure 7 It is a structural schematic diagram of the present application; Figure 6 It is a structural schematic diagram of the present application.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 1-Axle housing body; 2-Drive unit housing; 3-Half shaft; 4-Differential lock assembly; 401-Cylinder component; 402-Main bracket; 403-Locking nut; 404-Adjusting nut; 405-Shift fork shaft; 406-Sealing ring; 407-Shift fork; 408-Elastic component; 409-Meshing sleeve; 4011-Bushing; 4012-Sealing nut; 4013-Air pipe connector; 4014-Position sensor; 4101-Sealing end cap; 411-Drive component; 4111-Connecting plate; 4112-Cylinder barrel; 4113-Fixed end cap; 5-Differential meshing gear. Detailed Implementation

[0034] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and 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.

[0036] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this embodiment, as Figure 1 and Figure 2As shown, a differential lock structure for a drive axle includes an axle housing body 1, a drive unit housing 2, and a differential lock assembly 4. The differential lock assembly 4 includes a cylinder 401, a main support 402, a shift fork shaft 405, a shift fork 407, an elastic element 408, and a meshing sleeve 409. The drive unit housing 2 is equipped with differential meshing teeth 5. The cylinder 401 is located in a limiting groove in the axle housing body 1. The cylinder 401 is used to drive the shift fork shaft 405 to move laterally, so that the meshing sleeve 409 engages with the differential. The meshing teeth 5 are locked, the main bracket 402 is fixedly connected to the drive unit housing 2, the shift fork shaft 405 is inserted into the through hole of the main bracket 402, the top end of the shift fork 407 is assembled and connected to the shift fork shaft 405, the elastic element 408 is sleeved on the shift fork shaft 405, the elastic element 408 is located between the main bracket 402 and the shift fork 407, the meshing sleeve 409 is connected to the bottom end of the shift fork 407, the axle housing body 1 is equipped with a half shaft 3, and the center hole of the meshing sleeve 409 is inserted into the outer periphery of the half shaft 3.

[0038] Therefore, when gas is introduced, the gas pushes the shift fork shaft 405 to move laterally and drives the shift fork 407 to move. The elastic element 408 is compressed by the shift fork 407. The shift fork 407 pushes the engagement sleeve 409 to engage and lock with the differential engagement teeth 5. When the gas is introduced, the elastic potential energy of the elastic element 408 is used to push the shift fork shaft 405 to reset. The shift fork shaft 405 also drives the shift fork 407 and engagement sleeve 409 to reset. The engagement sleeve 409 separates from the differential engagement teeth 5, completing the unlocking. By integrating the differential lock assembly 4 into the interior of the axle housing body 1, the space of the axle housing body 1 is fully utilized while completing the differential locking function, reducing the space occupied by the external differential lock assembly 4.

[0039] Specifically, the axle housing body 1 has a cavity structure, the drive unit housing 2 is used to install gears, differentials and other structures, the differential meshing teeth 5 are used to control the differential, the main bracket 402 is machined into a U shape and has through holes at both ends that are adapted to the shift fork shaft 405, the shift fork shaft 405 is used to drive the shift fork 407 to move, the elastic element 408 is used to drive the shift fork shaft 405 to reset, the shift fork 407 is used to push the meshing sleeve 409 to move on the outer wall of the half shaft 3, and the half shaft 3 is located inside the axle housing body 1.

[0040] In some embodiments, such as Figure 3As shown, cylinder component 401 includes a bushing 4011, a sealing nut 4012, an air pipe connector 4013, and a position sensor 4014. The bushing 4011 is located in a slot in the axle housing body 1. The sealing nut 4012 is used to seal the end of the bushing 4011 away from the shift fork shaft 405. The air pipe connector 4013 is fixedly connected in the through hole of the axle housing body 1. The air outlet end of the air pipe connector 4013 communicates with the bushing 4011. The position sensor 4014 is fixedly connected in the center hole of the sealing nut 4012. A sealing ring 406 is sleeved in the front groove of the shift fork shaft 405, forming the piston part of cylinder component 401.

[0041] Specifically, bushing 4011 is located on the outer periphery of shift fork shaft 405, and the outer periphery of bushing 4011 is fixedly connected to axle housing body 1. A groove adapted to sealing ring 406 is machined at the front end of shift fork shaft 405. Sealing ring 406 is located between bushing 4011 and shift fork shaft 405. Sealing nut 4012 is located in axle housing body 1 to seal the end of bushing 4011 away from shift fork shaft 405, so that gas flows in one direction. Air pipe connector 4013 is used to connect to external air pipe. Position sensor 4014 is a technology known to those skilled in the art. The specific model is selected according to the usage requirements. Position sensor 4014 is used to transmit information to the cab whether the differential lock is locked.

[0042] In some embodiments, such as Figure 4 and Figure 5 As shown, the sealing nut 4012 can also be replaced by the sealing end cap 4101, and the air pipe connector 4013 can also be installed in the through hole of the sealing end cap 4101. The air outlet of the air pipe connector 4013 is connected to the bushing 4011.

[0043] Specifically, when the sealing end cap 4101 is used to replace the sealing nut 4012, the air pipe connector 4013 is installed in the through hole of the sealing end cap 4101 and parallel to the position sensor 4014. In this embodiment, the design of the sealing end cap 4101 is used to change the usage position of the air pipe connector 4013 to better adapt to the space of the external vehicle body. The two design methods of the sealing end cap 4101 and the sealing nut 4012 have the same way of pushing the shift fork shaft 405 to move, the difference lies in the different installation positions.

[0044] In some embodiments, such as Figure 2 As shown, an adjusting nut 404 is threaded onto the outer periphery of the shift fork shaft 405. The adjusting nut 404 is located between the shift fork shaft 405 and the main support 402. A locking nut 403 is threaded onto the outer periphery of the adjusting nut 404. The locking nut 403 is used to lock the adjusting nut 404.

[0045] It should be noted that the adjusting nut 404 can move laterally in the gap between the shift fork shaft 405 and the main bracket 402. The position of the locking nut 403 on the outer periphery of the adjusting nut 404 is adjusted to constrain the stroke of the shift fork shaft 405, so that the movement distance of the shift fork shaft 405 is adjustable. The adjusting nut 404 is used to precisely adjust the clearance between the engagement sleeve 409 and the differential engagement teeth 5 during differential lock assembly. The locking nut 403 locks the adjusting nut 404 to prevent the adjusting nut 404 from loosening.

[0046] In some embodiments, such as Figure 6 and Figure 7 As shown, cylinder component 401 can also be replaced by drive component 411. Drive component 411 includes connecting plate 4111, cylinder 4112 and fixed end cap 4113. Connecting plate 4111 is fixedly connected to the outer periphery of axle housing body 1. The top end of cylinder 4112 is fixedly connected to connecting plate 4111. Cylinder 4112 is located in the groove of axle housing body 1. The outlet end of air pipe connector 4013 is connected to cylinder 4112. Fixed end cap 4113 is located at the open end of cylinder 4112. Shift fork shaft 405 is inserted into the center hole of fixed end cap 4113. Elastic component 408 is coaxially arranged with shift fork shaft 405 in the cavity of cylinder 4112. The end of shift fork shaft 405 away from cylinder 4112 is connected to shift fork 407.

[0047] Specifically, the connecting plate 4111 seals the groove in the axle housing body 1 where the cylinder 4112 is installed. The cylinder 4112 has a cylindrical cavity for housing the elastic element 408 and the shift fork shaft 405. The center of the fixed end cover 4113 has a through hole that matches the shift fork shaft 405 to restrict the lateral movement of the shift fork shaft 405.

[0048] In some embodiments, such as Figure 6 As shown, the connecting plate 4111 and the cylinder 4112 are integrally formed.

[0049] The design of the connecting plate 4111 and the cylinder 4112 being integrally formed facilitates the disassembly of the cylinder 4112.

[0050] In some embodiments, such as Figure 4 As shown, the tooth grooves of the meshing sleeve 409 are matched with the teeth of the differential meshing teeth 5.

[0051] When the teeth of the differential engagement tooth 5 and the grooves of the engagement sleeve 409 are engaged, the locking function is achieved.

[0052] In some embodiments, such as Figure 2 As shown, the shift fork 407 is Y-shaped.

[0053] Specifically, the shift fork 407 is machined in a Y-shape, and the bottom opening of the shift fork 407 matches the groove of the engagement sleeve 409 to drive the engagement sleeve 409 to move laterally.

[0054] In some embodiments, such as Figure 2 As shown, elastic element 408 is a compression spring.

[0055] The elastic element 408 adopts a compression spring design, which facilitates the reset of the shift fork 407 driven by the shift fork shaft 405 after the shift fork is moved.

[0056] In some embodiments, such as Figure 3 As shown, the sealing ring 406 is made of fluororubber.

[0057] The sealing ring 406 is designed with fluororubber material to reduce the deformation of the sealing ring 406 caused by high temperature, thereby maintaining the sealing performance.

[0058] The working principle of this application is illustrated below with a preferred embodiment:

[0059] When the axle housing body 1 is sealed with sealing nut 4012 and air is introduced into bushing 4011 through air pipe connector 4013, the gas pushes shift fork shaft 405 to move laterally and away from position sensor 4014. Shift fork shaft 405 drives shift fork 407 to move, and elastic element 408 is compressed by shift fork 407. At the same time, shift fork 407 pushes engagement sleeve 409 to engage and lock with differential engagement teeth 5. Simultaneously, position sensor 4014 outputs a signal, and the differential lock light in the cab illuminates. When the gas supply stops, the elastic potential energy of elastic element 408 pushes shift fork shaft 405 to reset. Shift fork shaft 405 moves closer to position sensor 4014, and shift fork shaft 405 drives shift fork 407 and engagement sleeve 409 to reset. Engagement sleeve 409 separates from differential engagement teeth 5, completing the unlocking process. At the same time, position sensor 4014 sends a signal, and the differential lock light in the cab goes out.

[0060] When the sealing nut 4012 is replaced with the sealing end cap 4102, and the air pipe connector 4013 is installed on the sealing end cap 4102, when the air pipe connector 4013 introduces air into the axle housing body 1, the gas pushes the shift fork shaft 405 to move laterally and away from the position sensor 4014. The shift fork 407 pushes the engagement sleeve 409 to engage and lock with the differential engagement teeth 5. When the gas supply stops, the elastic element 408 pushes the shift fork shaft 405 to reset. The shift fork shaft 405 moves closer to the position sensor 4014, and the engagement sleeve 409 separates from the differential engagement teeth 5, completing the unlocking. At the same time, the position sensor 4014 sends a signal, and the differential lock light in the cab goes out.

[0061] When cylinder 401 is replaced by drive 411, when gas is introduced, the gas pushes shift fork shaft 405 to move laterally and makes shift fork shaft 405 contact position sensor 4014. Elastic element 408 is compressed between fixed end cover 4113 and cylinder 4112. Shift fork shaft 405 drives shift fork 407 to move. Shift fork 407 pushes engagement sleeve 409 to engage and lock with differential engagement teeth 5. At the same time, position sensor 4014 outputs a signal, and the cab differential lock light illuminates. When gas is stopped, elastic element 408 rebounds and pushes shift fork shaft 405 to reset. When shift fork shaft 405 drives shift fork 407 to reset, it also drives engagement sleeve 409 to disengage from differential engagement teeth 5 to unlock. At the same time, position sensor 4014 sends a signal, and cab differential lock light goes out.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A differential lock structure for a drive axle, characterized in that, include: Axle housing (1), drive unit housing (2), differential lock assembly (4); The differential lock assembly (4) includes a cylinder (401), a main bracket (402), a shift fork shaft (405), a shift fork (407), an elastic element (408), and a meshing sleeve (409). The drive unit housing (2) is equipped with differential engagement teeth (5). The cylinder component (401) is located in the limiting groove of the axle housing body (1). The cylinder component (401) is used to drive the shift fork shaft (405) to move laterally so that the engagement sleeve (409) locks the differential engagement teeth (5). The main bracket (402) is fixedly connected to the drive unit housing (2). The shift fork shaft (405) is inserted into the through hole of the main bracket (402). The top end of the shift fork (407) is assembled and connected to the shift fork shaft (405). The elastic element (408) is sleeved on the shift fork shaft (405). The elastic element (408) is located between the main support (402) and the shift fork (407). The engagement sleeve (409) is connected to the bottom end of the shift fork (407). A half shaft (3) is arranged in the bridge housing body (1). The center hole of the engagement sleeve (409) is inserted into the outer periphery of the half shaft (3).

2. The differential lock structure for a drive axle according to claim 1, characterized in that, The cylinder component (401) includes a bushing (4011), a sealing nut (4012), a pipe connector (4013), and a position sensor (4014). The bushing (4011) is located in the slot of the axle housing body (1), the sealing nut (4012) is used to seal the end of the bushing (4011) away from the shift fork shaft (405), the air pipe connector (4013) is fixedly connected in the through hole of the axle housing body (1), the air outlet end of the air pipe connector (4013) is connected to the bushing (4011), and the position sensor (4014) is fixedly connected in the center hole of the sealing nut (4012). A sealing ring (406) is fitted into the groove at the front end of the shift fork shaft (405), forming the piston part of the cylinder component (401).

3. The differential lock structure for a drive axle according to claim 2, characterized in that, The sealing nut (4012) can also be replaced by a sealing end cap (4101), and the air pipe connector (4013) can also be installed in the through hole of the sealing end cap (4101). The air outlet of the air pipe connector (4013) is connected to the bushing (4011).

4. The differential lock structure for a drive axle according to claim 1, characterized in that, An adjusting nut (404) is threaded onto the outer periphery of the shift fork shaft (405). The adjusting nut (404) is located between the shift fork shaft (405) and the main support (402). A locking nut (403) is threaded onto the outer periphery of the adjusting nut (404). The locking nut (403) is used to lock the adjusting nut (404).

5. A differential lock structure for a drive axle according to claim 2, characterized in that, The cylinder component (401) can also be replaced by a drive component (411). The drive unit (411) includes a connecting plate (4111), a cylinder (4112), and a fixed end cap (4113). The connecting plate (4111) is fixedly connected to the outer periphery of the axle housing body (1), the top end of the cylinder (4112) is fixedly connected to the connecting plate (4111), the cylinder (4112) is located in the groove of the axle housing body (1), the outlet end of the air pipe connector (4013) is connected to the cylinder (4112), the fixed end cap (4113) is located at the open end of the cylinder (4112), the shift fork shaft (405) is inserted into the center hole of the fixed end cap (4113), the elastic element (408) is coaxially arranged with the shift fork shaft (405) in the cavity of the cylinder (4112), and the end of the shift fork shaft (405) away from the cylinder (4112) is connected to the shift fork (407).

6. A differential lock structure for a drive axle according to claim 5, characterized in that, The connecting plate (4111) and the cylinder (4112) are integrally formed.

7. A differential lock structure for a drive axle according to claim 1, characterized in that, The tooth grooves of the engagement sleeve (409) are matched with the teeth of the differential engagement teeth (5).

8. A differential lock structure for a drive axle according to claim 1, characterized in that, The fork (407) is Y-shaped.

9. A differential lock structure for a drive axle according to claim 1, characterized in that, The elastic element (408) is a compression spring.

10. A differential lock structure for a drive axle according to claim 2, characterized in that, The sealing ring (406) is made of fluororubber.

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