A fork drive lockable limited slip differential

Abstract

The utility model provides a kind of limited slip differential of fork drive lockable, including the cavity being constituted by upper cover and lower cover, drive shaft end portion is equipped with driving disc, it is inlaid into cavity and is engaged with driving gear, cavity is equipped with installation cavity and its inside mirror image symmetry is provided with two pairs of worm gear assembly, each pair of component connects a rotating shaft;Wherein one unilateral rotating shaft is equipped with clamping block, installation cavity outside corresponding position is equipped with the clamping groove piece that can be axially moved, the groove piece is connected with the lever mechanism by connecting shaft, clamping groove piece has inner ring notch and outer ring second clamping block, normal state clamping block is separated from inner ring notch, second clamping block is clamped with shell, when locking, lever mechanism pushes connecting shaft to make clamping groove piece axially move, make inner ring notch and clamping block clamping, forcibly two rotating shafts are synchronous;Further realize reliable differential locking function, improve corresponding speed and the stability of vehicle under complex road conditions.

Description

Technical Field

[0001] This utility model relates to the field of differential technology, and more specifically, to a fork-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 fork-driven lockable limited-slip differential that uses a lever 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 fork-driven lockable limited-slip differential. By actively controlling the drive shaft 10 through the lever mechanism 11, the locking slot 9 is moved 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 fork-driven lockable limited-slip differential includes a cavity formed by an upper cover 22 and a lower cover 23 of the 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; characterized in that: a mounting cavity 5 is provided in the cavity, and two pairs of worm gear assemblies 6 are arranged mirror-symmetrically inside the cavity, each pair of assemblies being connected to a rotating shaft 7; a snap-fit ​​block 8 is provided on one side of the rotating shaft 70, and an axially movable block 8 is provided at a corresponding position on the outer shell of the mounting cavity 5. A movable locking slot 9 is connected to a lever mechanism 11 via a connecting shaft 10. The locking slot 9 has an inner ring groove 91 and an outer ring second locking block 92. Under normal conditions, the locking block 8 is separated from the inner ring groove 91 and the second locking block 92 is engaged with the second locking groove 21 of the outer shell of the mounting cavity 5. When the corresponding single-sided rotating shaft 70 is locked, the lever mechanism 11 drives the connecting shaft 10 to move the locking slot 9 axially, so that the inner ring groove 91 is engaged with the locking block 8, forcing the two rotating shafts 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 71 is provided on the side of the rotating shaft 7 away from the worm gear assembly 6. The second annular bearing 71 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 lever mechanism 11 includes a lever fork 111, a lever plate 112, and a motor; the lead screw 113 of the motor drives the lever fork 111, the lever fork 111 is linked to the lever plate 112, and the lever plate 112 drives the connecting shaft 10 to move axially.

[0010] 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.

[0011] 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 disks 63 of adjacent worms 62 mesh with each other.

[0012] 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.

[0013] 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.

[0014] Furthermore, the snap-fit ​​block 8 is integrated into the shoulder of the single-sided rotating shaft 70 or a flange component fixedly sleeved on the single-sided rotating shaft 70.

[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 fork-driven lockable limited-slip differential drives the locking slot 9 to move axially through the lever mechanism 11, causing its inner ring groove 91 to engage with the locking block 8 on the single-sided rotating shaft 70, forcing the two rotating shafts to rotate synchronously, thus realizing reliable locking and flexible release of the differential, and improving the vehicle's ability to get out of trouble and power distribution efficiency on low-traction road surfaces; the locking block 8 and the inner ring groove 91 are matched with a spline structure. In the locked state, the spline structure can uniformly transmit torque, avoiding damage to the locking structure caused by local stress concentration. At the same time, the guiding nature 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 by the first ring bearing 221 and the second ring bearing 71, enabling smooth operation; multiple worms 62 are evenly distributed around the worm gear 61 and mesh with each other, improving torque capacity and transmission smoothness; further realizing a reliable differential locking function, improving 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 fork-driven lockable limited-slip differential according to this utility model.

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

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

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

[0022] Figure 6 This utility model relates to a lockable limited-slip differential driven by a shift fork. Figure 5 A magnified view of a portion of the image (100).

[0023] Explanation of main component symbols

[0024] 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, lever mechanism 11, shift fork 111, shift plate 112, lead screw 113, first annular bearing 221, second annular bearing 71.

[0025] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0026] 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.

[0027] 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).

[0028] 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:

[0029] like Figure 1 The diagram shown is a schematic representation of the overall structure of a fork-driven lockable limited-slip differential according to this invention; Figure 2 The diagram shown is a partial structural schematic of a fork-driven lockable limited-slip differential according to this utility model; as shown... Figure 3 The diagram shown is a partial structural schematic of a fork-driven lockable limited-slip differential according to this utility model; as shown... Figure 4 The diagram shown is a schematic of the worm gear assembly structure of a fork-driven lockable limited-slip differential according to this utility model; Figure 5 The image shown is a cross-sectional schematic diagram of a fork-driven lockable limited-slip differential according to this utility model; as shown... Figure 6 As shown, this utility model discloses a lockable limited-slip differential driven by a shift fork. Figure 5 A magnified view of a portion of the image (100).

[0030] A fork-driven lockable limited-slip differential includes a cavity formed by an upper cover 22 and a lower cover 23 of the 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; characterized in that: a mounting cavity 5 is provided in the cavity, and two pairs of worm gear assemblies 6 are arranged mirror-symmetrically inside the cavity, each pair of assemblies being connected to a rotating shaft 7; a snap-fit ​​block 8 is provided on one side of the rotating shaft 70, and an axially movable block 8 is provided at a corresponding position on the outer shell of the mounting cavity 5. A movable locking slot 9 is connected to a lever mechanism 11 via a connecting shaft 10. The locking slot 9 has an inner ring groove 91 and an outer ring second locking block 92. Under normal conditions, the locking block 8 is separated from the inner ring groove 91 and the second locking block 92 is engaged with the second locking groove 21 of the outer shell of the mounting cavity 5. When the corresponding single-sided rotating shaft 70 is locked, the lever mechanism 11 drives the connecting shaft 10 to move the locking slot 9 axially, so that the inner ring groove 91 is engaged with the locking block 8, forcing the two rotating shafts to synchronize.

[0031] 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 71 is provided on the side of the rotating shaft 7 away from the worm gear assembly 6. The second annular bearing 71 is embedded in the mounting holes on both sides of the axle housing. This arrangement greatly improves the rotational accuracy of the rotating shaft 7, can effectively withstand the high radial load generated by the transmission of the worm gear 61 and worm 62, ensures the stability and durability of the differential assembly under complex working conditions, and reduces vibration and noise.

[0032] The lever mechanism 11 includes a shift fork 111, a shift plate 112, and a motor; the lead screw 113 of the motor drives the shift fork 111, the shift fork 111 is linked to the shift plate 112, and the shift plate 112 drives the connecting shaft 10 to move axially; the lever mechanism 11 can achieve precise and stable control of the position of the shift fork 111, with fast response speed and one-key locking function.

[0033] The snap-fit ​​block 8 and the inner ring groove 91 of the snap-fit ​​slot 9 achieve a snap-fit ​​engagement through a spline structure. This spline structure has the advantages of a large contact area and strong load-bearing capacity, enabling the transmission of a large torque at the moment of locking and ensuring a powerful and reliable locking action. The axial movement path of the snap-fit ​​slot 9 is constrained 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 ​​groove 21. The guide structure ensures the precise positioning of the snap-fit ​​slot 9 during axial movement.

[0034] 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 disks 63 of adjacent worms 62 mesh with each other. There are three worms 62 evenly distributed at 120°, and the gear disks 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.

[0035] The snap-fit ​​block 8 is integrated into the shoulder of the single-sided rotating shaft 70 or fixedly sleeved on the single-sided rotating shaft 70; 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.

[0036] The beneficial effects of this utility model are as follows: A fork-driven lockable limited-slip differential drives the locking slot 9 to move axially through the lever mechanism 11, causing its inner ring groove 91 to engage with the locking block 8 on the single-sided rotating shaft 70, forcing the two rotating shafts to rotate synchronously, thus realizing reliable locking and flexible release of the differential, and improving the vehicle's ability to get out of trouble and power distribution efficiency on low-traction road surfaces; the locking block 8 and the inner ring groove 91 are matched with a spline structure. In the locked state, the spline structure can uniformly transmit torque, avoiding damage to the locking structure caused by local stress concentration. At the same time, the guiding nature 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 by the first ring bearing 221 and the second ring bearing 71, enabling smooth operation; multiple worms 62 are evenly distributed around the worm gear 61 and mesh with each other, improving torque capacity and transmission smoothness; further realizing a reliable differential locking function, improving the corresponding speed and the stability of the vehicle under complex road conditions.

[0037] 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 fork-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. Each pair of assemblies is connected to a rotating shaft (7). One side of the rotating shaft (70) is provided with a snap-fit ​​block (8). 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 lever 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 side rotating shaft (70) is locked, the lever 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), forcing the two rotating shafts to synchronize.

2. The fork-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 (71) is provided on the side of the rotating shaft (7) away from the worm gear assembly (6). The second annular bearing (71) is embedded in the mounting holes on both sides of the bridge housing.

3. A lockable limited-slip differential driven by a shift fork 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 lockable limited-slip differential driven by a shift fork as described in claim 1, characterized in that: The lever mechanism (11) includes a fork (111), a lever (112), and a motor; the lead screw (113) of the motor drives the fork (111), the fork (111) is linked to the lever (112), and the lever (112) drives the connecting shaft (10) to move axially.

5. A lockable limited-slip differential driven by a shift fork as described in claim 3, 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).

6. A lockable limited-slip differential driven by a shift fork as described in claim 1, 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 disks (63) of adjacent worms (62) mesh with each other.

7. A lockable limited-slip differential driven by a shift fork as described in claim 6, 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.

8. A lockable limited-slip differential driven by a shift fork as described in claim 6, 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.

9. A lockable limited-slip differential driven by a shift fork as described in claim 5, characterized in that: The snap-fit ​​block (8) is integrated into the shoulder of the single-sided rotating shaft (70) or a flange component fixedly sleeved on the single-sided rotating shaft (70).

10. A lockable limited-slip differential driven by a shift fork 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).

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