Limited slip differential

Abstract

The utility model discloses a limited slip differential which comprises 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, and a plurality of double-face friction plates or synchronous steel sheets are installed on the driven bevel gear. A plurality of synchronous steel sheets or double-sided friction sheets are correspondingly mounted on the first half-shaft bevel gear, the plurality of double-sided friction sheets and the plurality of synchronous steel sheets are alternately arranged, and a pressing device for pressing the plurality of double-sided friction sheets and the plurality of synchronous steel sheets together is further included. When the wheel on one side slips, 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 rapidly transfer driving force to the wheel on the other side, the whole power is distributed to the wheels on the two sides, and therefore the escape capacity and the running stability of the vehicle are improved. The axle is particularly useful in muddy or uneven terrain and farmland operation.

Description

TECHNICAL FIELD

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

[0002] The prior art differential, such as Chinese patent CN219975271U, discloses a low-friction high durability differential assembly structure, including tooth surface differential shell, tooth back differential shell, cross shaft, conical roller bearing, half shaft gear and planetary gear, the tooth surface differential shell is connected with tooth back differential shell, the tooth surface differential shell is connected with driven bevel gear, the driven bevel gear is engaged with driving bevel gear and is driven, the tooth surface differential shell inside is connected with cross shaft, the planetary gear is connected with cross shaft through conical roller bearing, the half shaft gear is equipped with two, two half shaft gears are arranged on the two sides of cross shaft respectively, half shaft gear is engaged with planetary gear and is driven, two half shaft gears are connected with an output shaft respectively.

[0003] The above technical scheme has the following disadvantages: axle and reducer make vehicle, especially tractor one of the most basic configurations, it mainly bears the function of supporting the vehicle body and transmitting driving force, ordinary front axle structure is simple, the manufacturing cost is low, can satisfy the basic demand of farmland operation. However, with the improvement of agricultural production performance requirements of tractor, ordinary axle gradually exposes some limitations, such as easy to slip or understeer, the passability and stability under complex terrain are low. UTILITY MODEL CONTENT

[0004] The utility model aims at above -mentioned problem provides a kind of limited slip differential, if wheel is in the state of skidding or vehicle is in the state of understeer, driven bevel gear, first half axle bevel gear and second half axle bevel gear combine into a whole.

[0005] To achieve the above object, the utility model discloses a kind of limited slip differential, including driven bevel gear, first half axle bevel gear and second half axle bevel gear, first half axle bevel gear is connected with first half axle, second half axle bevel gear is connected with second half axle, a plurality of double-sided friction plates or synchronous steel sheets are installed on driven bevel gear, a plurality of synchronous steel sheets or double-sided friction plates are installed on first half axle bevel gear correspondingly, a plurality of double-sided friction plates and a plurality of synchronous steel sheets are alternately arranged, further include the compression device for compressing a plurality of double-sided friction plates and a plurality of synchronous steel sheets together.

[0006] 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, and meets the turning requirement. If the wheels are in a slipping state or the vehicle is in a understeering state, the compression device will compress 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 compressed 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 escape ability and driving stability of the vehicle. This axle is particularly useful in muddy or uneven terrain, and in farmland operation.

[0007] Preferably, the compression device comprises a piston and a driving structure for driving the piston.

[0008] In normal driving state, the piston is away from the double-sided friction plates and the synchronous steel sheets, and 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, and meets the turning requirement. If the wheels are in a slipping state or the vehicle is in a understeering state, the piston will compress the several double-sided friction plates and the several synchronous steel sheets together. This structure is simple and convenient to use.

[0009] Preferably, it further comprises a differential case, the driven bevel gear is fixedly connected to the outside of the differential case, the first half axle bevel gear is rotatably connected to the inside of the differential case, and the several double-sided friction plates or the synchronous steel sheets are located on the inner wall of the differential case; the driving structure comprises a first oil port located on the side of the piston away from the double-sided friction plates or the synchronous steel sheets, hydraulic oil enters the differential case through the first oil port, and the piston moves by hydraulic pressure; or the driving structure comprises an electromagnet located on the side of the piston away from the double-sided friction plates or the synchronous steel sheets, a permanent magnet is installed on the piston, and the electromagnet is powered on to drive the piston to move by magnetic force.

[0010] In normal driving state, the first oil port does not have hydraulic oil entering the differential case, the piston is away from the double-sided friction plates and the synchronous steel sheets, and 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, and meets 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 case through the first oil port, and the piston moves by hydraulic pressure to compress the several double-sided friction plates and the several synchronous steel sheets together. This structure is simple and convenient to use.

[0011] In another embodiment, if the wheels are in a slipping state or the vehicle is in a understeering state, the electromagnet is started to drive the piston to move by magnetic force, and the several double-sided friction plates and the several synchronous steel sheets are compressed together. This structure is simple and convenient to use.

[0012] 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 path connecting the first oil port and the second oil port.

[0013] In use, the hydraulic oil enters the differential housing through the third oil path, the second oil path, the second oil port, the first oil path and the first oil port in sequence, which is convenient for use.

[0014] Preferably, the first oil port is arranged towards the piston.

[0015] In use, the hydraulic oil is convenient to push the piston to move.

[0016] Preferably, the differential housing comprises a tooth back differential housing body and a tooth surface differential housing body, the tooth surface differential housing body is connected with a tooth surface flange, and the connecting bolt is threadedly connected with the driven bevel gear after sequentially penetrating through the tooth back differential housing body and the tooth surface flange.

[0017] This structure is convenient for installation of the tooth back differential housing body, the tooth surface differential housing body and the driven bevel gear.

[0018] 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.

[0019] 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.

[0020] Preferably, the tooth surface differential housing body is connected with a tooth surface sleeve capable of being sleeved on the second half shaft.

[0021] This structure is convenient for installation between the differential housing and the axle housing.

[0022] In conclusion, the beneficial effects of the utility model lie in that if the wheels are in the slipping state or the vehicle is in the understeering state, the pressing device presses the plurality of double-sided friction plates and the plurality of synchronous steel sheets together. When one side of the 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 an integral whole, the limited slip differential can rapidly transfer the driving force to the other side of the wheel, the whole driving force is distributed to the two sides of the wheel, the vehicle's ability to get out of trouble and the driving stability are improved, and the axle is particularly useful in muddy or uneven terrain and farmland operation. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structure schematic view of the limited slip differential of the utility model.

[0024] Figure 2It is a structural schematic diagram of a limited slip differential axle.

[0025] Figure 3 It is Figure 2 It is an enlarged structural schematic diagram of the middle part A.

[0026] Figure 4 It is Figure 3 It is an enlarged structural schematic diagram of the middle part B.

[0027] 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 differential housing; 8, tooth back sleeve; 9, tooth back bearing; 10, connecting bolt; 11, tooth face differential housing; 12, tooth face flange; 13, driven bevel gear; 14, planetary gear; 15, planetary gear shaft; 16, planetary gear support; 17, positioning pin; 18, tooth face sleeve; 19, tooth face bearing; 20, second oil port; 21, first oil path; 22, first oil port; 23, piston; 24, double-sided friction plate; 25, synchronous steel sheet; 26, second oil path; 27, third oil path; 28, sealing sleeve; 29, sealing ring; 30, tooth back locking nut; 31, tooth back bearing seat; 32, tooth face bearing seat; 33, tooth face locking nut; 34, axle housing. DETAILED DESCRIPTION

[0028] 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.

[0029] 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 therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0030] 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 indicated technical features. 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 "multiple" is two or more.

[0031] 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.

[0032] Example 1, such as Figures 1 to 4 As shown, a limited-slip differential includes 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. A plurality of double-sided friction plates 24 or synchronous steel plates 25 are mounted on the driven bevel gear 13, and a plurality of synchronous steel plates 25 or double-sided friction plates 24 are correspondingly mounted on the first half-shaft bevel gear 4. The plurality of double-sided friction plates 24 and synchronous steel plates 25 are alternately arranged. A clamping device is also included for pressing the plurality of double-sided friction plates 24 and synchronous steel plates 25 together. In use, the driven bevel gear 13, the first half-shaft bevel gear 4, and the second half-shaft bevel gear 5 are located within the axle housing 34. Under normal driving conditions, the plurality of double-sided friction plates 24 and synchronous steel plates 25 are in a separated state, and the differential allows free differential speed between the left and right wheels, meeting cornering requirements. If a wheel is slipping or the vehicle is understeer, the clamping device presses several double-sided friction plates 24 and several synchronous steel plates 25 together. When one wheel slips, the 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.

[0033] Specifically, the clamping device includes a piston 23 and a drive structure for driving the piston 23. Under normal driving conditions, the piston 23 is away from the double-sided friction plates 24 and the synchronizer plates 25, and the double-sided friction plates 24 and synchronizer plates 25 are separated. The differential allows the left and right wheels to freely differential, meeting cornering requirements. If the wheels are slipping or the vehicle is understeer, the piston 23 presses several double-sided friction plates 24 and several synchronizer plates 25 together. This structure is simple and easy to use.

[0034] Also include differential shell, driven bevel gear 13 is installed in the differential shell outside in fixed connection, the first half axle bevel gear 4 is installed in the differential shell inside in rotary connection, several double-sided friction plate 24 or synchronous steel sheet 25 is located in the differential shell inner wall;Driving structure includes the first oil port 22 located in the piston 23 side away from double-sided friction plate 24 or synchronous steel sheet 25, hydraulic oil enters the differential shell through the first oil port 22, and the piston 23 is moved by hydraulic pressure. Normal driving state, the first oil port 22 is not entered into the differential shell by hydraulic oil, the piston 23 is away from the double-sided friction plate 24 and the synchronous steel sheet 25, and the double-sided friction plate 24 and the synchronous steel sheet 25 are separated state, and the differential allows left and right wheels to freely differential, meet the turning demand. If the wheel is in the slip state or the vehicle is in the understeering state, then the hydraulic oil enters the differential shell through the first oil port 22, and the piston 23 is moved by hydraulic pressure, and several double-sided friction plate 24 and several synchronous steel sheet 25 are pressed together. This structure is simple, and convenient to use.

[0035] 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 synchronous steel sheet 25, and a permanent magnet is installed on the piston 23. The electromagnet is energized, and the piston 23 is moved by magnetic force. Normal driving state, the electromagnet is not started, and the piston 23 is away from the double-sided friction plate 24 and the synchronous steel sheet 25, and the double-sided friction plate 24 and the synchronous steel sheet 25 are separated state, and the differential allows left and right wheels to freely differential, meet the turning demand. If the wheel is in the slip state or the vehicle is in the understeering state, then the electromagnet is started, and the piston 23 is moved by magnetic force, and several double-sided friction plate 24 and several synchronous steel sheet 25 are pressed together. This structure is simple, and convenient to use.

[0036] 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 passage 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 passage 26 corresponding to the second oil port 20, the two sealing rings 29 are arranged between the tooth back sleeve 8 and the sealing sleeve 28, 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 passage 27 corresponding to the second oil passage 26. In use, the hydraulic oil enters the differential housing in sequence through the third oil passage 27, the second oil passage 26, the second oil port 20, the first oil passage 21 and the first oil port 22, which is convenient to use. The first oil port 22 is arranged towards the piston 23. In use, it is convenient for the hydraulic oil to drive the piston 23 to move. 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, and the connecting bolt 10 is in threaded connection with the driven bevel gear 13 in sequence after penetrating through the tooth back differential housing 7 and the tooth surface flange 12. This structure facilitates the installation of the tooth back differential housing 7, the tooth surface differential housing 11 and the driven bevel gear 13. The planetary gear shaft 15 is installed on the tooth surface differential housing 11, the planetary gear 14 is installed on the planetary gear shaft 15, 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. 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 installed 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.

[0037] 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 installed in the tooth back differential housing 7, the tooth back bearing 9 is installed between the tooth back sleeve 8 and the tooth back bearing seat 31, the tooth surface bearing seat 32 is installed in the tooth surface differential housing 11, and the tooth surface bearing 19 is installed between the tooth surface sleeve 18 and the tooth surface bearing seat 32. The tooth back locking nut 30 is connected with the end of the tooth back differential housing 7, and the tooth surface locking nut 33 is connected with the end of the tooth surface differential housing 11. This structure facilitates the installation between the differential housing and the axle housing 34.

[0038] A method for using the limited slip differential as described in Embodiment 1, comprising the following steps:

[0039] Step S1, the processing unit receives the signal of the collecting unit, and judges whether the wheels are in a slipping state or the vehicle is in an understeering state;

[0040] Step S2, if the wheel is in the slip state or the vehicle is in the understeering state, the processing unit controls the pressing device to press the several double-sided friction plates 24 and the several synchronous steel sheets 25 together.

[0041] When one side wheel slips, the several double-sided friction plates 24 and the several synchronous steel sheets 25 are pressed together, 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 side wheel, so that the whole driving force is distributed to the two side wheels, thereby improving the escape ability and the driving stability of the vehicle, and the axle is especially useful in muddy or uneven terrain, farmland operation.

[0042] Specifically, in step S1, when the wheel speed of a certain wheel is greater than or equal to the reference speed by a preset value, it is considered that the wheel is in the slip state; when the angular velocity of the vehicle is greater than or equal to the reference angular velocity by a preset value, it is considered that the vehicle is in the understeering state.

[0043] In step S2, the friction force between the several double-sided friction plates 24 and the several synchronous steel sheets 25 is calculated according to the following formula:

[0044]

[0045] Or,

[0046]

[0047] Among them, is the value of the friction force between the several double-sided friction plates 24 and the several synchronous steel sheets 25 after being completely pressed.

[0048] 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 force between the friction plates increases, and the speed difference in 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.

[0049] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, 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 regarded as the protection range of the present application.​​

Claims

1. A limited slip differential comprising a driven bevel gear (13), a first axle shaft bevel gear (4) to which a first axle shaft (1) is connected and a second axle shaft bevel gear (5) to which a second axle shaft (2) is connected, characterized in that A plurality of double-sided friction plates (24) or synchronous steel sheets (25) are mounted on the driven bevel gear (13), and a plurality of synchronous steel sheets (25) or double-sided friction plates (24) are correspondingly 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 pressing device for pressing the plurality of double-sided friction plates (24) and the plurality of synchronous steel sheets (25) together is further included.

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

3. The limited slip differential of claim 2, wherein, The differential case is further included, the driven bevel gear (13) is fixedly connected to the outside of the differential case, the first half shaft bevel gear (4) is rotatably connected to the inside of the differential case, and the plurality of double-sided friction plates (24) or synchronous steel sheets (25) are arranged on the inner wall of the differential case; the driving structure includes a first oil port (22) on the side of the piston (23) away from the double-sided friction plates (24) or the synchronous steel sheets (25), the hydraulic oil enters the differential case through the first oil port (22), and the piston (23) is driven to move by the hydraulic pressure; or the driving structure includes an electromagnet on the side of the piston (23) away from the double-sided friction plates (24) or the synchronous steel sheets (25), a permanent magnet is mounted on the piston (23), and the electromagnet is powered to drive the piston (23) to move by magnetic force.

4. The limited slip differential of claim 3, wherein, The differential case is further included, the driven bevel gear (13) is fixedly connected to the outside of the differential case, the first half shaft bevel gear (4) is rotatably connected to the inside of the differential case, and the plurality of double-sided friction plates (24) or synchronous steel sheets (25) are arranged on the inner wall of the differential case; the driving structure includes a first oil port (22) on the side of the piston (23) away from the double-sided friction plates (24) or the synchronous steel sheets (25), the hydraulic oil enters the differential case through the first oil port (22), and the piston (23) is driven to move by the hydraulic pressure; or the driving structure includes an electromagnet on the side of the piston (23) away from the double-sided friction plates (24) or the synchronous steel sheets (25), a permanent magnet is mounted on the piston (23), and the electromagnet is powered to drive the piston (23) to move by magnetic force.

5. The limited slip differential of claim 4, wherein, The differential case includes a tooth back differential case body (7) and a tooth surface differential case body (11), the tooth surface differential case body (11) is connected with a tooth surface flange (12), and a connecting bolt (10) is sequentially threaded through the tooth back differential case body (7), the tooth surface flange (12) and the driven bevel gear (13).

6. The limited slip differential of claim 3, wherein, The tooth surface differential case body (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 engaged with the planetary gear (14).

7. The limited slip differential of claim 6, wherein, The tooth surface differential case body (11) is connected with a tooth surface sleeve (18) capable of sleeving the second half shaft (2).

8. The limited slip differential of claim 6, wherein, ​

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