Slide limiting structure for differential mechanism

Abstract

The slip limiting structure comprises a differential shell, a driven bevel gear, a first half shaft bevel gear and a second half shaft bevel gear, the first half shaft bevel gear is connected with a first half shaft, the second half shaft bevel gear is connected with a second half shaft, the differential shell comprises a tooth back difference shell body and a tooth surface difference shell body, the tooth surface difference shell body is connected with a tooth surface flange, and the driven bevel gear is connected with a driven bevel gear. A connecting bolt sequentially penetrates through the tooth back difference shell and the tooth face flange and then is in threaded connection with the driven bevel gear, a plurality of double-face friction plates or synchronous steel plates are installed on the inner side wall of the tooth face difference shell, a plurality of synchronous steel plates or double-face friction plates are correspondingly installed on the first half shaft bevel gear, and the double-face friction plates and the synchronous steel plates are alternately arranged. And the pressing device is used for pressing the plurality of double-sided friction plates and the plurality of synchronous steel sheets together. And by means of friction force between the double-sided friction plates and the synchronous steel sheets, the service life is long.

Description

TECHNICAL FIELD

[0001] The utility model relates to axle technology field, specifically, relates to a limited slip structure for differential. BACKGROUND

[0002] The prior art limited slip structure for differential, such as Chinese patent CN2644297Y, discloses a differential locking mechanism, including rear wheel axle, differential, ratchet, ratchet runner and shift fork, ratchet is fixed at the one end of rear wheel axle differential, and ratchet runner that is matched with ratchet is installed on rear wheel axle, and shift fork is arranged on ratchet runner, and through shift fork, ratchet runner moves along the axial direction. The utility model working process: when shift fork is shifted, makes ratchet runner along axial direction and engages with ratchet, then differential loses effect, and wheel will not idle; when shift fork is shifted, makes ratchet runner and ratchet separate, then differential restores function. The utility model has the advantages of reasonable structure, convenient to use, effectively controls differential effect, avoids wheel idling etc.

[0003] The above technical scheme has the following shortcomings: when ratchet runner and ratchet engage, differential loses effect, in actual use, rear wheel axle is in rotating state, and ratchet runner is close to ratchet, and it is easy to cause tooth damage and short service life. UTILITY MODEL CONTENTS

[0004] The utility model aims at above -mentioned problem provides a kind of limited slip structure for differential, rely on the friction between several double-sided friction plate and several synchronous steel sheet, long service life.

[0005] To achieve the above object, the utility model discloses a kind of limited slip structure for differential, including differential case, driven bevel gear, first axle shaft bevel gear and second axle shaft bevel gear, first axle shaft bevel gear is connected with first axle shaft, second axle shaft bevel gear is connected with second axle shaft, differential case includes tooth back differential body and tooth surface differential body, tooth surface differential body is connected with tooth surface flange, connecting bolt is sequentially passed tooth back differential body, tooth surface flange then with driven bevel gear is threadedly connected, tooth surface differential body inner wall is installed with several double-sided friction plate or synchronous steel sheet, corresponding first axle shaft bevel gear is installed with several synchronous steel sheet or double-sided friction plate, several double-sided friction plate and several synchronous steel sheet are alternately arranged, further include the compression device for compressing several double-sided friction plate and several synchronous steel sheet together.

[0006] This structure facilitates the installation of tooth back differential body, tooth surface differential body and driven bevel gear.

[0007] In normal driving state, the several double-sided friction plates and the several synchronous steel sheets are in a separated state, the differential allows the left and right wheels to freely differential, meeting the turning requirement. If the wheels are in a slipping state or the vehicle is in a understeering state, the pressing device will press the several double-sided friction plates and the several synchronous steel sheets together. When one side of the wheels slips, the several double-sided friction plates and the several synchronous steel sheets are pressed together, the driven bevel gear, the first half axle bevel gear and the second half axle bevel gear are combined into a whole, the limited slip differential can quickly transfer the driving force to the other side of the wheels, so that the driving force is distributed to both sides of the wheels, thereby improving the vehicle's ability to escape and driving stability. This axle is particularly useful in muddy or uneven terrain, farmland operation.

[0008] Preferably, the pressing device comprises a piston and a driving structure for driving the piston.

[0009] In normal driving state, the piston is away from the double-sided friction plates and the synchronous steel sheets, the double-sided friction plates and the synchronous steel sheets are in a separated state, the differential allows the left and right wheels to freely differential, meeting the turning requirement. If the wheels are in a slipping state or the vehicle is in a understeering state, the piston will press the several double-sided friction plates and the several synchronous steel sheets together. This structure is simple and convenient to use.

[0010] Preferably, the driving structure comprises a first oil port on the side of the piston away from the double-sided friction plates or the synchronous steel sheets, the hydraulic oil enters the differential housing through the first oil port, and the piston moves by hydraulic pressure;

[0011] In normal driving state, the first oil port has no hydraulic oil entering the differential housing, the piston is away from the double-sided friction plates and the synchronous steel sheets, the double-sided friction plates and the synchronous steel sheets are in a separated state, the differential allows the left and right wheels to freely differential, meeting the turning requirement. If the wheels are in a slipping state or the vehicle is in a understeering state, the hydraulic oil enters the differential housing through the first oil port, and the piston moves by hydraulic pressure, pressing the several double-sided friction plates and the several synchronous steel sheets together. This structure is simple and convenient to use.

[0012] Alternatively, in another embodiment, the driving structure comprises an electromagnet on the side of the piston away from the double-sided friction plates or the synchronous steel sheets, and a permanent magnet is installed on the piston. The electromagnet is energized to move the piston by magnetic force. In normal driving state, the electromagnet is not started, the piston is away from the double-sided friction plates and the synchronous steel sheets, the double-sided friction plates and the synchronous steel sheets are in a separated state, the differential allows the left and right wheels to freely differential, meeting the turning requirement. If the wheels are in a slipping state or the vehicle is in a understeering state, the electromagnet is started, the piston moves by magnetic force, pressing the several double-sided friction plates and the several synchronous steel sheets together. This structure is simple and convenient to use.

[0013] Preferably, the differential housing has a tooth back sleeve capable of being sleeved on the first half shaft, the first oil port is located at the connection between the side of the tooth back sleeve extending into the differential housing and the differential housing, the side of the tooth back sleeve extending out of the differential housing is provided with the second oil port, and the tooth back sleeve is provided with the first oil passage connecting the first oil port and the second oil port.

[0014] In use, the hydraulic oil enters the differential housing through the third oil passage, the second oil passage, the second oil port, the first oil passage and the first oil port in sequence, which is convenient for use.

[0015] Preferably, the first oil port is arranged towards the piston.

[0016] In use, the hydraulic oil is convenient for pushing the piston to move.

[0017] Preferably, the tooth surface differential housing body is provided with a planetary gear shaft, the planetary gear shaft is provided with a planetary gear, and the first half shaft bevel gear and the second half shaft bevel gear are all engaged with the planetary gear.

[0018] In the normal driving state, the piston is away from the double-sided friction plate and the synchronous steel sheet, the double-sided friction plate and the synchronous steel sheet are in the separated state, the differential allows the left and right wheels to freely differential, and the turning requirement is met.

[0019] Preferably, the tooth surface differential housing body is connected with a tooth surface sleeve capable of being sleeved on the second half shaft.

[0020] In conclusion, the beneficial effects of the differential lie in that when one side wheel slips, the plurality of double-sided friction plates and the plurality of synchronous steel sheets are pressed together, the driven bevel gear, the first half shaft bevel gear and the second half shaft bevel gear are combined into a whole, the limited slip differential can quickly transfer the driving force to the other side wheel, the whole driving force is distributed to the two side wheels, and thus the vehicle's ability to get out of trouble and the driving stability are improved. Meanwhile, the structure is convenient for the installation of the tooth back differential housing body, the tooth surface differential housing body and the driven bevel gear, the plurality of double-sided friction plates or the synchronous steel sheets are installed on the inner side wall of the tooth surface differential housing body, and thus the machining and manufacturing are facilitated. The service life is long due to the friction force between the plurality of double-sided friction plates and the plurality of synchronous steel sheets. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structure schematic view of a limited slip structure for a differential of the utility model.

[0022] Figure 2 is a structure schematic view of an axle of the utility model.

[0023] Figure 3 is Figure 2Enlarged structural schematic view of the middle part A.

[0024] Figure 4 is Figure 3 Enlarged structural schematic view of the middle part B.

[0025] In the figure: 1, first half shaft; 2, second half shaft; 3, driving shaft; 4, first half shaft bevel gear; 5, second half shaft bevel gear; 6, driving bevel gear; 7, tooth back difference shell; 8, tooth back sleeve; 9, tooth back bearing; 10, connecting bolt; 11, tooth surface difference shell; 12, tooth surface flange; 13, driven bevel gear; 14, planetary gear; 15, planetary gear shaft; 16, planetary gear support; 17, positioning pin; 18, tooth surface sleeve; 19, tooth surface bearing; 20, second oil port; 21, first oil way; 22, first oil port; 23, piston; 24, double-sided friction plate; 25, synchronous steel sheet; 26, second oil way; 27, third oil way; 28, sealing sleeve; 29, sealing ring; 30, tooth back locking nut; 31, tooth back bearing seat; 32, tooth surface bearing seat; 33, tooth surface locking nut; 34, axle housing. DETAILED DESCRIPTION

[0026] The specific embodiments of the present application will be further described in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0028] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] Example 1, as Figures 1 to 4 As shown, a limited-slip structure for a differential includes a differential housing, a driven bevel gear 13, a first half-shaft bevel gear 4, and a second half-shaft bevel gear 5. The first half-shaft bevel gear 4 is connected to a first half-shaft 1, and the second half-shaft bevel gear 5 is connected to a second half-shaft 2. A driving bevel gear 6 meshes with the driven bevel gear 13 and is connected to a driving shaft 3. The differential housing includes a back-tooth differential housing 7 and a front-tooth differential housing 11. A front-tooth flange 12 is connected to the front-tooth differential housing 11. Connecting bolts 10 pass through the back-tooth differential housing 7 and the front-tooth flange 12 in sequence and are threadedly connected to the driven bevel gear 13. This structure facilitates the installation of the back-tooth differential housing 7, the front-tooth differential housing 11, and the driven bevel gear 13. The inner wall of the differential housing 7 is fitted with several double-sided friction plates 24 or synchronous steel plates 25. Correspondingly, several synchronous steel plates 25 or double-sided friction plates 24 are mounted on the first half-shaft bevel gear 4. The double-sided friction plates 24 and synchronous steel plates 25 are alternately arranged. A clamping device is also included to press the double-sided friction plates 24 and synchronous steel plates 25 together. In use, the axle housing 34, differential housing, driven bevel gear 13, first half-shaft bevel gear 4, and second half-shaft bevel gear 5 are installed inside the axle housing 34. Under normal driving conditions, the double-sided friction plates 24 and synchronous steel plates 25 are separated, allowing the left and right wheels to freely differential, meeting turning requirements. If the wheels slip or the vehicle is understeer, the clamping device presses the double-sided friction plates 24 and synchronous steel plates 25 together. When one wheel slips, several double-sided friction plates 24 and several synchronous steel plates 25 are pressed together, and the driven bevel gear 13, the first half-shaft bevel gear 4 and the second half-shaft bevel gear 5 are combined into a whole. The limited-slip differential can quickly transfer the driving force to the other wheel, so that the entire power is distributed to both wheels, thereby improving the vehicle's ability to get out of trouble and driving stability. This type of axle is especially useful in muddy or uneven terrain and in farmland operations.

[0031] Specifically, the compression device includes a piston 23 and a driving structure for driving the piston 23. In normal driving state, the piston 23 is away from the double-sided friction plate 24 and the synchronization steel sheet 25, and the double-sided friction plate 24 and the synchronization steel sheet 25 are in a separated state, and the differential allows the left and right wheels to freely differential, meeting the turning requirement. If the wheels are in a slipping state or the vehicle is in an understeering state, the piston 23 will press several double-sided friction plates 24 and several synchronization steel sheets 25 together. This structure is simple and convenient to use. The driving structure includes a first oil port 22 located on the side of the piston 23 away from the double-sided friction plate 24 or the synchronization steel sheet 25, and hydraulic oil enters the differential case through the first oil port 22, and the piston 23 is driven to move by hydraulic pressure. In normal driving state, the first oil port 22 has no hydraulic oil entering the differential case, and the piston 23 is away from the double-sided friction plate 24 and the synchronization steel sheet 25, and the double-sided friction plate 24 and the synchronization steel sheet 25 are in a separated state, and the differential allows the left and right wheels to freely differential, meeting the turning requirement. If the wheels are in a slipping state or the vehicle is in an understeering state, hydraulic oil enters the differential case through the first oil port 22, and the piston 23 is driven to move by hydraulic pressure, pressing several double-sided friction plates 24 and several synchronization steel sheets 25 together. This structure is simple and convenient to use. In another embodiment, the driving structure includes an electromagnet located on the side of the piston 23 away from the double-sided friction plate 24 or the synchronization steel sheet 25, and a permanent magnet is installed on the piston 23. The electromagnet is energized to drive the piston 23 to move by magnetic force. In normal driving state, the electromagnet is not started, the piston 23 is away from the double-sided friction plate 24 and the synchronization steel sheet 25, and the double-sided friction plate 24 and the synchronization steel sheet 25 are in a separated state, and the differential allows the left and right wheels to freely differential, meeting the turning requirement. If the wheels are in a slipping state or the vehicle is in an understeering state, the electromagnet is started, and the piston 23 is driven to move by magnetic force, pressing several double-sided friction plates 24 and several synchronization steel sheets 25 together. This structure is simple and convenient to use.

[0032] Specifically, the differential housing has a tooth back sleeve 8 capable of being sleeved on the first half shaft 1, the first oil port 22 is located at the connection between the side of the tooth back sleeve 8 extending into one end of the differential housing and the differential housing, the side of the tooth back sleeve 8 extending out of one end of the differential housing is provided with the second oil port 20, and the tooth back sleeve 8 is provided with the first oil path 21 communicating the first oil port 22 and the second oil port 20. The sealing sleeve 28 is arranged between the tooth back sleeve 8 and the axle housing 34, the sealing sleeve 28 is provided with the second oil path 26 corresponding to the second oil port 20, two sealing rings 29 are arranged between the sealing sleeve 28 and the tooth back sleeve 8, the two sealing rings 29 are respectively located on the two sides of the second oil port 20, and the axle housing 34 is provided with the third oil path 27 corresponding to the second oil path 26. In use, the hydraulic oil enters the differential housing in sequence through the third oil path 27, the second oil path 26, the second oil port 20, the first oil path 21 and the first oil port 22, and the use is convenient. The first oil port 22 is arranged towards the piston 23. In use, the hydraulic oil facilitates the movement of the piston 23. The tooth surface differential housing 11 is provided with the planetary gear shaft 15, the planetary gear 14 is arranged on the planetary gear shaft 15, and the first half shaft bevel gear 4 and the second half shaft bevel gear 5 are engaged with the planetary gear 14. Specifically, the tooth surface differential housing 11 is connected with the planetary gear support 16, and the positioning pin 17 for fixing the planetary gear shaft 15 is arranged on the planetary gear support 16. In the normal driving state, the piston 23 is away from the double-sided friction plate 24 and the synchronous steel sheet 25, the double-sided friction plate 24 and the synchronous steel sheet 25 are in a separated state, the differential allows the left and right wheels to freely differ in speed, and the turning requirement is met.

[0033] Specifically, the tooth surface differential housing 11 is connected with the tooth surface sleeve 18 capable of being sleeved on the second half shaft 2. The tooth back bearing seat 31 is arranged in the tooth back differential housing 7, the tooth back bearing 9 is arranged between the tooth back sleeve 8 and the tooth back bearing seat 31, the tooth surface bearing seat 32 is arranged in the tooth surface differential housing 11, and the tooth surface bearing 19 is arranged between the tooth surface sleeve 18 and the tooth surface bearing seat 32. The tooth back locking nut 30 is connected to the end of the tooth back differential housing 7, and the tooth surface locking nut 33 is connected to the end of the tooth surface differential housing 11. This structure facilitates the installation between the differential housing and the axle housing 34.

[0034] A method for using the limited slip structure of the differential as described in Embodiment 1, comprising the following steps:

[0035] Step S1, the processing unit receives the signal of the collecting unit, and judges whether the wheel is in a slipping state or the vehicle is in an understeering state;

[0036] Step S2, if the wheel is in a slipping state or the vehicle is in an understeering state, the processing unit controls the pressing device to press the plurality of double-sided friction plates 24 and the plurality of synchronous steel sheets 25 together.

[0037] When one side wheel slips, several double-sided friction plates 24 and several synchronous steel sheets 25 are pressed together, the driven bevel gear 13, the first half axle bevel gear 4 and the second half axle bevel gear 5 are combined into an integral whole, the limited slip differential can quickly transfer driving force to the other side wheel, so that the driving force is distributed to both sides, thereby improving the escape ability and driving stability of the vehicle, which is especially useful in muddy or uneven terrain, farmland operation.

[0038] In step S1, when the difference between the wheel speed and the reference speed is greater than or equal to a preset value, the wheel is considered to be in a slipping state; when the difference between the vehicle angular velocity and the reference angular velocity is greater than or equal to a preset value, the vehicle is considered to be in an understeering state.

[0039] In step S2, the calculation formula of the friction between the several double-sided friction plates 24 and the several synchronous steel sheets 25 is:

[0040] ;

[0041] Or,

[0042] ;

[0043] Wherein, is the value of the friction between the several double-sided friction plates 24 and the several synchronous steel sheets 25 after being completely pressed.

[0044] The processing unit continuously adjusts the hydraulic pressure according to the real-time road conditions, realizes stepless adjustment from complete opening to high locking, the friction between the friction plates increases, and the speed difference inside the differential is limited. The higher the pressure, the greater the locking rate, and the torque distribution is biased to the side wheel with high adhesion.

[0045] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, some improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A limited slip structure for a differential, comprising a differential case, a driven bevel gear (13), a first half shaft bevel gear (4) to which a first half shaft (1) is connected, and a second half shaft bevel gear (5) to which a second half shaft (2) is connected, characterized in that, The differential housing comprises a tooth back differential housing (7) and a tooth surface differential housing (11), the tooth surface differential housing (11) is connected with a tooth surface flange (12), a connecting bolt (10) is sequentially threaded through the tooth back differential housing (7), the tooth surface flange (12) and is in threaded connection with a driven bevel gear (13), a plurality of double-sided friction plates (24) or synchronous steel sheets (25) are mounted on the inner side wall of the tooth surface differential housing (11), a corresponding plurality of synchronous steel sheets (25) or double-sided friction plates (24) are mounted on the first half shaft bevel gear (4), the plurality of double-sided friction plates (24) and the plurality of synchronous steel sheets (25) are alternately arranged, and the differential further comprises a pressing device for pressing the plurality of double-sided friction plates (24) and the plurality of synchronous steel sheets (25) together.

2. The limited slip structure for a differential according to claim 1, wherein The pressing device comprises a piston (23) and a driving structure for driving the piston (23).

3. The limited slip structure for a differential according to claim 2, wherein The driving structure comprises a first oil port (22) located on the side of the piston (23) away from the double-sided friction plate (24) or the synchronous steel sheet (25), hydraulic oil enters the differential housing through the first oil port (22) and drives the piston (23) to move through hydraulic pressure; or the driving structure comprises an electromagnet located on the side of the piston (23) away from the double-sided friction plate (24) or the synchronous steel sheet (25), a permanent magnet is mounted on the piston (23), and the electromagnet is powered to drive the piston (23) to move through magnetic force.

4. The limited slip structure for a differential according to claim 3, wherein The differential housing is provided with a tooth back sleeve (8) capable of sleeving the first half shaft (1), the first oil port (22) is located at the connection between the side of the end of the tooth back sleeve (8) extending into the differential housing and the differential housing, the side of the end of the tooth back sleeve (8) extending out of the differential housing is provided with a second oil port (20), and the tooth back sleeve (8) is provided with a first oil path (21) communicating the first oil port (22) and the second oil port (20); A sealing sleeve (28) is arranged between the tooth back sleeve (8) and the bridge housing (34), the sealing sleeve (28) is provided with a second oil path (26) corresponding to the second oil port (20), two sealing rings (29) are arranged between the sealing sleeve (28) and the tooth back sleeve (8), and the two sealing rings (29) are respectively located on the two sides of the second oil port (20). The bridge housing (34) is provided with a third oil path (27) corresponding to the second oil path (26).

5. The limited slip structure for a differential according to claim 4, wherein The first oil port (22) is arranged towards the piston (23).

6. The limited slip structure for a differential according to any one of claims 1 to 5, characterized by, The tooth surface differential housing (11) is provided with a planetary gear shaft (15), the planetary gear shaft (15) is provided with a planetary gear (14), and the first half shaft bevel gear (4) and the second half shaft bevel gear (5) are in meshing connection with the planetary gear (14).

7. The limited slip structure for a differential according to any one of claims 1 to 5, characterized in that, The tooth surface differential housing (11) is connected with a tooth surface sleeve (18) capable of sleeving the second half shaft (2).

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