A cylinder driven lockable limited slip differential

Abstract

The utility model provides a kind of cylinder drive lockable limited slip differential, including the cavity being made of upper cover and lower cover, driving shaft passes through driving disc and driving gear input power, mirror image is equipped with two pairs of worm gear assemblies in the mounting cavity in cavity, each pair of components connects a rotating shaft, and one unilateral rotating shaft is equipped with clamping block, mounting cavity outside is equipped with the clamping groove piece that can be moved axially by cylinder mechanism, normal state, clamping groove piece is separated from rotating shaft;When needing to lock, cylinder mechanism drives connecting shaft to drive clamping groove piece to move, so that its inner ring slot and the clamping block on rotating shaft are engaged, so that the synchronous of two rotating shafts is forced, differential lock is realized, and the differential lock function of quick, reliable is realized using cylinder mechanism, and the response speed and the stability of vehicle under harsh working conditions are improved.

Description

Technical Field

[0001] This utility model relates to the field of differential technology, and more specifically, to a cylinder-driven lockable limited-slip differential. Background Technology

[0002] In automotive transmission systems, the limited-slip differential is a core component that ensures the vehicle's ability to navigate complex road conditions. It is mainly used to adjust the speed difference between the left and right wheels when turning or driving on uneven surfaces, ensuring smooth vehicle operation.

[0003] The existing technology CN221683517U discloses a new energy vehicle limited-slip differential that uses the cooperation of mechanical structures such as passive gears, preload springs, and clutch plates to generate greater thrust on the high-grip wheel side, so that the clutch plate is pressed and locked and power is transmitted, which alleviates the slippage problem to a certain extent. However, it relies on the axial force generated by the separation of the inclined gear to push the clutch plate, and the limited-slip response speed is limited by the mechanical transmission efficiency, making it difficult to lock quickly under sudden slippage conditions.

[0004] Therefore, there is an urgent need for a cylinder-driven lockable limited-slip differential, which uses a cylinder mechanism to drive the coupling shaft to move the locking slot axially, so that the inner ring slot engages with the locking block, achieving faster response and more precise locking. Utility Model Content

[0005] The purpose of this invention is to propose a cylinder-driven lockable limited-slip differential. The cylinder mechanism 11 actively controls the connecting shaft 10 to move the locking slot 9 axially, so that the inner ring slot 91 engages with the locking block 8, thereby achieving fast and precise locking and releasing, and improving the vehicle's passability and stability on low-traction roads.

[0006] A cylinder-driven lockable limited-slip differential includes a cavity formed by an upper cover 22 and a lower cover 23 of an axle housing; a drive disc 3 is provided at the end of a drive shaft 1, the drive disc 3 extends through the upper cover 22 into the cavity and meshes with a drive gear 4; the cavity is provided with a mounting cavity 5, in which two pairs of worm gear assemblies 6 are arranged mirror-symmetrically, each pair of assemblies being connected to a rotating shaft 7; a locking block 8 is provided on one side of the rotating shaft 70, and the outer housing of the mounting cavity 5 is provided with an axially movable... The snap-fit ​​slot 9 is connected to the cylinder mechanism 11 via a connecting shaft 10. The snap-fit ​​slot 9 has an inner ring groove 91 and an outer ring second snap block 92. Under normal conditions, the snap block 8 is separated from the inner ring groove 91 and the second snap block 92 is engaged with the second snap groove 21 of the outer shell of the mounting cavity 5. When the corresponding single-sided rotating shaft 70 is locked, the cylinder mechanism 11 drives the connecting shaft 10 to move the snap-fit ​​slot 9 axially, so that the inner ring groove 91 is engaged with the snap block 8, forcing the two rotating shafts 7 to synchronize.

[0007] Furthermore, the upper cover 22 has downwardly extending mounting plates on both sides, each mounting plate having an annular mounting hole. A first annular bearing 221 is installed around the mounting hole. The rotating shaft 7 passes through the mounting hole and connects to the worm gear assembly 6. A second annular bearing 222 is provided on the side of the rotating shaft 7 away from the worm gear assembly 6. The second annular bearing 222 is embedded in the mounting holes on both sides of the bridge housing.

[0008] Furthermore, the snap-fit ​​block 8 and the inner ring groove 91 of the snap-fit ​​slot 9 are engaged through a spline structure.

[0009] Furthermore, the cylinder mechanism 11 includes: a rotating air passage sleeve 71 fixed to the upper cover 22, a cylinder body 72 fixed to the outer shell of the mounting cavity 5, and a piston 73 slidably disposed within the cylinder body 72; the piston 73 divides the interior of the cylinder body 72 into a first chamber 81 and a second chamber 82; the rotating air passage sleeve 71 is provided with a first air passage 83 connecting the first chamber 81 and a second air passage 84 connecting the second chamber 82; the piston 73 is connected to a connecting shaft 10 to drive the snap-fit ​​slot 9 to move axially; a rotating sealing ring 75 is provided between the rotating air passage sleeve 71 and the cylinder body 72 to form two independent air passages and achieve rotating sealing of the air passage.

[0010] Furthermore, one end of the connecting shaft 10 abuts against the snap-fit ​​slot 9, and the other end abuts against the cylinder mechanism 11; when the first air passage 83 is ventilated, the piston 73 moves towards the second chamber 82, driving the connecting shaft 10 to move the snap-fit ​​slot 9 to the snap-fit ​​position; when the second air passage connector 92 is ventilated, the piston 73 moves towards the first chamber 81, driving the connecting shaft 10 to move and reset the snap-fit ​​slot 9.

[0011] Furthermore, the axial movement path of the snap-fit ​​slot 9 is limited by the guiding structure of the outer shell of the mounting cavity 5, ensuring the alignment of the inner ring slot 91 with the snap-fit ​​block 8 and the fitting accuracy of the second snap-fit ​​block 92 with the second snap-fit ​​slot 21.

[0012] Furthermore, the worm gear assembly 6 includes a worm wheel 61 fixed to the rotating shaft 7 and at least two worms 62 arranged around the worm wheel 61. The two ends of the worms 62 are rotatably supported on the outer shell of the mounting cavity 5, and the gear discs of adjacent worms 62 mesh with each other.

[0013] Furthermore, there are three worm gears 62 evenly distributed at 120°, and the gear disks of each worm gear 62 mesh sequentially to form a linkage structure.

[0014] Furthermore, the two pairs of worm gear assemblies 6 are arranged in a mirror-symmetrical manner with the drive shaft 1 as the center line.

[0015] Furthermore, the helical teeth of the drive gear 4 and the helical teeth of the drive disk 3 form a helical gear pair, which is used to transmit the torque of the drive shaft 1 to the outer housing of the mounting cavity 5.

[0016] The beneficial effects of this utility model are as follows: A cylinder-driven lockable limited-slip differential, by supplying air to the first air passage 83 and into the first chamber 81, the air pressure pushes the piston 73 towards the second chamber 82, driving the connecting shaft 10 to move the locking slot 9 axially, so that the inner ring groove 91 engages with the locking block 8, achieving locking; conversely, by supplying air to the second air passage 84 and compressing the piston 73 to move to the first chamber 81, unlocking is achieved; the locking block 8 and the inner ring groove 91 are splined, and in the locked state, the spline structure... The structure can uniformly transmit torque, avoiding damage to the locking structure caused by local stress concentration. At the same time, the guiding property of the spline can help the locking slot 9 and the locking block 8 to quickly align, improving the smoothness of the locking action. The rotating shaft 7 is supported between the axle housing and the upper cover 22 by the first ring bearing 221 and the second ring bearing 222, which can operate smoothly. Multiple worms 62 are evenly distributed around the worm gear 61 and mesh with each other, which improves the torque capacity and transmission smoothness. It further realizes a reliable differential locking function, improves the corresponding speed and the stability of the vehicle under complex road conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a cylinder-driven lockable limited-slip differential according to this utility model.

[0018] Figure 2 This is a partial structural diagram of a cylinder-driven lockable limited-slip differential according to the present invention.

[0019] Figure 3 This is a partial structural diagram of a cylinder-driven lockable limited-slip differential under normal operating conditions according to this utility model.

[0020] Figure 4 This is a schematic diagram of the worm gear assembly structure of a cylinder-driven lockable limited-slip differential according to this utility model.

[0021] Figure 5 This is a cross-sectional schematic diagram of the locked state of a cylinder-driven lockable limited-slip differential according to this utility model.

[0022] Figure 6 This utility model relates to a cylinder-driven lockable limited-slip differential. Figure 5 Local magnification Figure 1 .

[0023] Figure 7 This utility model relates to a cylinder-driven lockable limited-slip differential. Figure 5 Local magnification Figure 2 .

[0024] Figure 8 This is a cross-sectional schematic diagram of the unlocked state of a cylinder-driven lockable limited-slip differential according to this utility model.

[0025] Figure 9 This utility model relates to a cylinder-driven lockable limited-slip differential. Figure 8 Local magnification Figure 3 .

[0026] Explanation of main component symbols

[0027] Drive shaft 1, second slot 21, upper cover 22, lower cover 23, drive disc 3, drive gear 4, mounting cavity 5, worm gear assembly 6, worm gear 61, worm 62, rotating shaft 7, single-sided rotating shaft 70, snap-fit ​​block 8, snap-fit ​​groove 9, inner ring groove 91, outer ring second snap-fit ​​block 92, connecting shaft 10, cylinder mechanism 11, rotating air passage outer sleeve 71, cylinder body 72, piston 73, first chamber 81, second chamber 82, first air passage 83, second air passage 84, rotating sealing ring 75, first annular bearing 221, second annular bearing 222.

[0028] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0029] The following embodiments are described to aid in understanding this application. These embodiments are not, and should not be construed as, limiting the scope of protection of this application.

[0030] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as individual functional units (which may include subunits), but those skilled in the art will recognize that various components or portions thereof may be divided into individual components or may be integrated together (including integrated within a single system or component).

[0031] Furthermore, the connection between components or systems is not intended to be limited to a direct connection; on the contrary, data between these components may be modified, reformatted, or otherwise altered by intermediate components. Additionally, other or fewer connections may be used. It should also be noted that the terms "connection," "link," or "input" should be understood to include direct connections, indirect connections via one or more intermediate devices, and wireless connections. Example 1:

[0032] like Figure 1 The diagram shown is a schematic representation of the overall structure of a cylinder-driven lockable limited-slip differential according to this utility model; Figure 2 The diagram shown is a partial structural schematic of a cylinder-driven lockable limited-slip differential according to this utility model; Figure 3The diagram shown is a partial structural schematic of a cylinder-driven lockable limited-slip differential under normal operating conditions according to this utility model; Figure 4 The diagram shown is a schematic of the worm gear assembly structure of a cylinder-driven lockable limited-slip differential according to this utility model; Figure 5 The image shown is a cross-sectional schematic diagram of the locked state of a cylinder-driven lockable limited-slip differential according to this utility model; as shown... Figure 6 As shown, this utility model discloses a cylinder-driven lockable limited-slip differential. Figure 5 Local magnification Figure 1 ;like Figure 7 As shown, this utility model discloses a cylinder-driven lockable limited-slip differential. Figure 5 Local magnification Figure 2 ;like Figure 8 The image shown is a cross-sectional schematic diagram of the unlocked state of a cylinder-driven lockable limited-slip differential according to this utility model; as shown... Figure 9 As shown, this utility model discloses a cylinder-driven lockable limited-slip differential. Figure 8 Local magnification Figure 3 .

[0033] A cylinder-driven lockable limited-slip differential includes a cavity formed by an upper cover 22 and a lower cover 23 of an axle housing; a drive disc 3 is provided at the end of a drive shaft 1, the drive disc 3 extends through the upper cover 22 into the cavity and meshes with a drive gear 4; the cavity is provided with a mounting cavity 5, in which two pairs of worm gear assemblies 6 are arranged mirror-symmetrically, each pair of assemblies being connected to a rotating shaft 7; a locking block 8 is provided on one side of the rotating shaft 70, and the outer housing of the mounting cavity 5 is provided with an axially movable... The snap-fit ​​slot 9 is connected to the cylinder mechanism 11 via a connecting shaft 10. The snap-fit ​​slot 9 has an inner ring groove 91 and an outer ring second snap block 92. Under normal conditions, the snap block 8 is separated from the inner ring groove 91 and the second snap block 92 is engaged with the second snap groove 21 of the outer shell of the mounting cavity 5. When the corresponding single-sided rotating shaft 70 is locked, the cylinder mechanism 11 drives the connecting shaft 10 to move the snap-fit ​​slot 9 axially, so that the inner ring groove 91 is engaged with the snap block 8, forcing the two rotating shafts 7 to synchronize.

[0034] The upper cover 22 has downwardly extending mounting plates on both sides, and each mounting plate has an annular mounting hole. A first annular bearing 221 is installed around the mounting hole. The rotating shaft 7 passes through the mounting hole and connects to the worm gear assembly 6. A second annular bearing 222 is provided on the side of the rotating shaft 7 away from the worm gear assembly 6. The second annular bearing 222 is embedded in the mounting holes on both sides of the bridge housing. The first annular bearing 221 and the second annular bearing 222 share the load and enhance the rotational accuracy of the rotating shaft 7.

[0035] The cylinder mechanism 11 includes: a rotating air passage sleeve 71 fixed to the upper cover 22, a cylinder body 72 fixed to the outer shell of the mounting cavity 5, and a piston 73 slidably disposed within the cylinder body 72; the piston 73 divides the interior of the cylinder body 72 into a first chamber 81 and a second chamber 82; the rotating air passage sleeve 71 is provided with a first air passage 83 connecting the first chamber 81 and a second air passage 84 connecting the second chamber 82; the piston 73 is connected to a connecting shaft 10 to drive the locking slot 9 to move axially; the rotating air passage sleeve 71 and the cylinder body 72 are connected to the cylinder body 72. A rotary sealing ring 75 is provided between the cylinder bodies 72, forming two independent air passages to achieve rotary sealing of the air passages. By combining the rotary air passage sleeve 71 with the cylinder body 72 and using the rotary sealing ring 75, two independent and sealed rotary air passages are constructed. This allows a fixed air source to reliably supply air to the first and second chambers inside the cylinder body 72 through the rotating interface, thereby precisely controlling the reciprocating motion of the piston 73 and ensuring the continuity and stability of pneumatic control. This is a key foundation for realizing the pneumatic locking function of the differential. One end of the connecting shaft 10 abuts against the locking slot 9, and the other end abuts against the cylinder mechanism 11. When the first air passage 83 is ventilated, the piston 73 is squeezed to move towards the second chamber 82, which drives the connecting shaft 10 to move the locking slot 9 to the locking position. When the second air passage connector 92 is ventilated, the piston 73 is squeezed to move towards the first chamber 81, which drives the connecting shaft 10 to reset the locking slot 9. No additional return spring is required; bidirectional drive can be achieved using air pressure, resulting in high reliability.

[0036] The snap-fit ​​block 8 and the inner ring groove 91 of the snap-fit ​​slot 9 are engaged through a spline structure. This spline structure has the advantages of a large contact area and high load-bearing capacity, enabling the transmission of a large torque during locking and ensuring reliable locking action. The axial movement path of the snap-fit ​​slot 9 is limited by the guide structure of the outer shell of the mounting cavity 5, ensuring the alignment of the inner ring groove 91 with the snap-fit ​​block 8 and the engagement accuracy of the second snap-fit ​​block 92 with the second snap-fit ​​slot 21. This guide structure ensures the accuracy and reliability of the locking mechanism's operation.

[0037] The worm gear assembly 6 includes a worm wheel 61 fixed to the rotating shaft 7 and at least two worms 62 arranged around the worm wheel 61. The two ends of the worms 62 are rotatably supported on the outer shell of the mounting cavity 5, and the gear discs of adjacent worms 62 mesh with each other. There are three worms 62 evenly distributed at 120°, and the gear discs of each worm 62 mesh sequentially to form a linkage structure. The two pairs of worm gear assemblies 6 are arranged in a mirror symmetrical manner with the drive shaft 1 as the center line, which further improves the torque capacity and transmission smoothness.

[0038] The helical teeth of the drive gear 4 and the helical teeth of the drive disk 3 form a helical gear pair, which is used to transmit the torque of the drive shaft 1 to the outer housing of the mounting cavity 5.

[0039] The beneficial effects of this utility model are as follows: A cylinder-driven lockable limited-slip differential, by supplying air to the first air passage 83 and into the first chamber 81, the air pressure pushes the piston 73 towards the second chamber 82, driving the connecting shaft 10 to move the locking slot 9 axially, so that the inner ring groove 91 engages with the locking block 8, achieving locking; conversely, by supplying air to the second air passage 84 and compressing the piston 73 to move to the first chamber 81, unlocking is achieved; the locking block 8 and the inner ring groove 91 are splined, and in the locked state, the spline structure... The structure can uniformly transmit torque, avoiding damage to the locking structure caused by local stress concentration. At the same time, the guiding property of the spline can help the locking slot 9 and the locking block 8 to quickly align, improving the smoothness of the locking action. The rotating shaft 7 is supported between the axle housing and the upper cover 22 by the first ring bearing 221 and the second ring bearing 222, which can operate smoothly. Multiple worms 62 are evenly distributed around the worm gear 61 and mesh with each other, which improves the torque capacity and transmission smoothness. It further realizes a reliable differential locking function, improves the corresponding speed and the stability of the vehicle under complex road conditions.

[0040] Although this application discloses several aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art. Various modifications and improvements can be made without departing from the concept of this application, and these all fall within the scope of protection of this application. The various aspects and embodiments disclosed in this application are for illustrative purposes only and are not intended to limit this application. The actual scope of protection of this application is determined by the claims.

Claims

1. A cylinder-driven lockable limited-slip differential, comprising a cavity formed by an upper cover (22) and a lower cover (23) of an axle housing; a drive disc (3) is provided at the end of a drive shaft (1), the drive disc (3) passing through the upper cover (22) and extending into the cavity to mesh with a drive gear (4); characterized in that: The cavity is provided with an installation cavity (5), in which two pairs of worm gear assemblies (6) are arranged symmetrically in a mirror image, and each pair of assemblies is connected to a rotating shaft (7); one of the rotating shafts (7) is provided with a snap-fit ​​block (8) on one side of the rotating shaft (70), and the corresponding position of the outer shell of the installation cavity (5) is provided with a snap-fit ​​groove (9) that can move axially. The snap-fit ​​groove (9) is connected to the cylinder mechanism (11) through a connecting shaft (10); the snap-fit ​​groove (9) has an inner ring groove (91) and an outer ring second snap block (92). Under normal conditions, the snap-fit ​​block (8) is separated from the inner ring groove (91) and the second snap block (92) is engaged with the second snap groove (21) of the outer shell of the installation cavity (5); when the corresponding single-sided rotating shaft (70) is locked, the cylinder mechanism (11) drives the connecting shaft (10) to move the snap-fit ​​groove (9) axially, so that the inner ring groove (91) is engaged with the snap-fit ​​block (8), and the two rotating shafts are forced to synchronize.

2. The cylinder-driven lockable limited-slip differential as described in claim 1, characterized in that: The upper cover (22) has downwardly extending mounting plates on both sides. Each mounting plate has an annular mounting hole. A first annular bearing (221) is installed around the mounting hole. The rotating shaft (7) passes through the mounting hole and connects to the worm gear assembly (6). A second annular bearing (222) is provided on the side of the rotating shaft (7) away from the worm gear assembly (6). The second annular bearing (222) is embedded in the mounting holes on both sides of the bridge housing.

3. The cylinder-driven lockable limited-slip differential as described in claim 1, characterized in that: The snap-fit ​​block (8) and the inner ring groove (91) of the snap-fit ​​slot (9) are engaged through a spline structure.

4. A cylinder-driven lockable limited-slip differential as described in claim 1, characterized in that: The cylinder mechanism (11) includes: a rotating air passage sleeve (71) fixed to the upper cover (22), a cylinder body (72) fixed to the outer shell of the mounting cavity (5), and a piston (73) slidably disposed in the cylinder body (72); the piston (73) divides the interior of the cylinder body (72) into a first chamber (81) and a second chamber (82); the rotating air passage sleeve (71) is provided with a first air passage (83) connecting the first chamber (81) and a second air passage (84) connecting the second chamber (82); the piston (73) is connected to a connecting shaft (10) to drive the snap-fit ​​slot (9) to move axially; a rotating sealing ring (75) is provided between the rotating air passage sleeve (71) and the cylinder body (72) to form two independent air passages and realize the rotating sealing of the air passage.

5. A cylinder-driven lockable limited-slip differential as described in claim 4, characterized in that: One end of the connecting shaft (10) abuts against the snap-fit ​​slot (9), and the other end abuts against the cylinder mechanism (11); when the first air passage (83) is ventilated, the piston (73) moves towards the second chamber (82), driving the connecting shaft (10) to move the snap-fit ​​slot (9) to the snap-fit ​​position; when the second air passage connector 92 is ventilated, the piston (73) moves towards the first chamber (81), driving the connecting shaft (10) to move and reset the snap-fit ​​slot (9).

6. A cylinder-driven lockable limited-slip differential as described in claim 5, characterized in that: The axial movement path of the snap-fit ​​slot (9) is limited by the guide structure of the outer shell of the mounting cavity (5), ensuring the alignment of the inner ring slot (91) with the snap-fit ​​block (8) and the fitting accuracy of the second snap-fit ​​block (92) with the second snap-fit ​​slot (21).

7. A cylinder-driven lockable limited-slip differential as described in claim 2, characterized in that: The worm gear assembly (6) includes a worm wheel (61) fixed to a rotating shaft (7) and at least two worms (62) arranged around the worm wheel (61). The two ends of the worms (62) are rotatably supported on the outer shell of the mounting cavity (5), and the gear discs of adjacent worms (62) mesh with each other.

8. A cylinder-driven lockable limited-slip differential as described in claim 7, characterized in that: The number of worms (62) is three and they are evenly distributed at 120°. The gear disks of each worm (62) mesh in sequence to form a linkage structure.

9. A cylinder-driven lockable limited-slip differential as described in claim 7, characterized in that: The two pairs of worm gear assemblies (6) are arranged in a mirror-symmetrical manner with the drive shaft (1) as the center line.

10. A cylinder-driven lockable limited-slip differential as described in claim 1, characterized in that: The helical teeth of the drive gear (4) and the helical teeth of the drive disk (3) form a helical gear pair, which is used to transmit the torque of the drive shaft (1) to the outer housing of the mounting cavity (5).

Images