Electromagnetic drive lockable limited slip differential

Abstract

The utility model provides a kind of electromagnetic drive lockable limited slip differential, including driving shaft, shell and rotating shell, two pairs of worm screw assemblies are symmetrically arranged in rotating shell inside, each pair of components connects a rotating shaft, and the end of one rotating shaft is provided with clamping block, rotating shell corresponding position is provided with the clamping slot piece that can be axially moved, and the clamping slot piece is connected with magnetic attraction device by connecting shaft;Normal, differential can be normal differential;When needing to lock, magnetic attraction device is attracted, drives the axial movement of clamping slot piece, so that its inner ring slot and the clamping block on rotating shaft are engaged, to realize locking function;Further, electromagnetic drive is used to realize quick, reliable locking and separation, compact structure, response is quick, can effectively improve the driving stability of vehicle.

Description

Technical Field

[0001] This utility model relates to the field of differential technology, and more specifically, to an electromagnetically 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 an electromagnetically driven lockable limited-slip differential that can directly drive the coupling shaft through a magnetic attraction device 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 an electromagnetically driven lockable limited-slip differential. The electromagnetic device 11 actively controls the drive 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] An electromagnetically driven lockable limited-slip differential includes a drive shaft 1, a housing 2, and a rotating housing 15. The outer shell 2 includes a bridge shell 24, an upper cover 22, and a lower cover 23. The rotating shell 15 is characterized by: a drive gear 4 meshing with a drive disk 3, the drive disk 3 being fixed to a drive shaft 1; two pairs of worm gear assemblies 6 are symmetrically arranged inside the rotating shell 15, each pair connected to a rotating shaft 7; one end of a single-sided rotating shaft 70 is provided with a locking block 8, and a corresponding position on the rotating shell 15 is provided with an axially movable locking slot 9, the locking slot 9 being connected to a magnetic suction device 11 via a connecting shaft 10; the locking slot 9 includes an inner ring groove 91 and an outer ring second locking block 92, normally the locking block 8 is separated from the inner ring groove 91 and the outer ring second locking block 92 is engaged with the second locking groove 21 of the rotating shell 15; when the corresponding single-sided rotating shaft 70 is locked, the magnetic suction device 11 drives the connecting shaft 10 to move the locking slot 9 axially, causing the inner ring groove 91 to engage 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 24.

[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, a spring 12 is sleeved on the connecting shaft 10. One end of the spring 12 abuts against the snap-fit ​​groove 9, and the other end abuts against the limiting member 13 of the rotating housing 15. Under normal conditions, the spring 12 is in a relaxed state, keeping the snap-fit ​​groove 9 in the snap-fit ​​position between the outer ring second snap-fit ​​block 92 and the second snap-fit ​​groove 21. When the magnetic attraction device 11 is activated, the spring 12 is compressed, causing the snap-fit ​​groove 9 to move to the snap-fit ​​position. After the magnetic force disappears, the spring 12 resets the snap-fit ​​groove 9.

[0010] Furthermore, the magnetic attraction device 11 is a combination structure of an electromagnet or permanent magnet and an electromagnetic coil, and the magnetic force generated by its energization drives the connecting shaft 10 to move axially.

[0011] Furthermore, the axial movement path of the snap-fit ​​slot 9 is limited by the guide structure of the rotating housing 15, ensuring the alignment of the inner ring slot 91 with the snap-fit ​​block 8 and the fitting accuracy of the outer ring second snap-fit ​​block 92 with the second snap-fit ​​slot 21.

[0012] Furthermore, the worm gear assembly 6 includes a turbine 61 fixed to the rotating shaft 7 and at least two worms 62 arranged around the turbine 61. The two ends of the worms 62 are rotatably supported on the rotating housing 15, 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 rotating housing 15.

[0016] The beneficial effects of this utility model are as follows: An electromagnetically driven lockable limited-slip differential uses a magnetic attraction device 11 to directly drive the axial movement of the locking slot 9. Electromagnetic force enables the locking block 8 to quickly engage or disengage from the inner ring groove 91, allowing for real-time responses to sudden changes in road surface adhesion conditions. This avoids the power waste caused by the lag in gear separation in traditional mechanical structures, improving the vehicle's ability to get out of trouble in complex road conditions such as ice, snow, and mud. A spline structure ensures precise engagement between the locking block 8 and the inner ring groove 91, and the symmetrical layout design of the worm gear assembly 6 ensures stable and efficient torque transmission. The spring 12 on the coupling shaft 10 automatically resets the locking slot 9, eliminating the need for complex mechanical linkage components, simplifying the overall structure, and extending the equipment's service life. Furthermore, it achieves rapid and precise locking and releasing, improving the vehicle's passability and stability on low-traction surfaces. Attached Figure Description

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

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

[0019] Figure 3 This is a schematic diagram of the worm gear assembly structure of an electromagnetically driven lockable limited-slip differential according to this utility model.

[0020] Figure 4 This is a schematic diagram of the internal structure of the housing of an electromagnetically driven lockable limited-slip differential according to this utility model.

[0021] Figure 5 This utility model relates to an electromagnetically driven lockable limited-slip differential. Figure 4 100-degree magnified view of a specific area.

[0022] Figure 6 This is a schematic cross-sectional view of an electromagnetically driven lockable limited-slip differential according to this utility model.

[0023] Figure 7 This is a partial cross-sectional schematic diagram of an electromagnetically driven lockable limited-slip differential according to this utility model.

[0024] Explanation of main component symbols

[0025] Drive shaft 1, housing 2, second slot 21, upper cover 22, lower cover 23, bridge housing 24, rotating housing 15, drive disc 3, drive gear 4, worm gear assembly 6, turbine 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, magnetic attraction device 11, spring 12, limiting component 13, first annular bearing 221, second annular bearing 71.

[0026] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0027] The following embodiments are described to aid in understanding this application. These embodiments are not, and should not be, construed in any way as limiting the scope of protection of this application.

[0028] 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).

[0029] 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:

[0030] like Figure 1 The diagram shown is a schematic representation of the overall structure of an electromagnetically driven lockable limited-slip differential according to this utility model; Figure 2 The diagram shown is a partial structural schematic of an electromagnetically driven lockable limited-slip differential according to this utility model; Figure 3 The diagram shown is a schematic representation of the worm gear assembly structure of an electromagnetically driven lockable limited-slip differential according to this utility model; Figure 4 The diagram shown is a schematic representation of the internal structure of an electromagnetically driven lockable limited-slip differential according to this invention; as shown... Figure 5 As shown, this utility model discloses an electromagnetically driven lockable limited-slip differential. Figure 4 Enlarged view of a portion, 100; as shown Figure 6 The image shown is a schematic cross-sectional view of an electromagnetically driven lockable limited-slip differential according to this utility model; as shown... Figure 7 The image shown is a partial cross-sectional schematic diagram of an electromagnetically driven lockable limited-slip differential according to this utility model.

[0031] An electromagnetically driven lockable limited-slip differential includes a drive shaft 1, a housing 2, and a rotating housing 15. The housing 2 includes a bridge housing 24, an upper cover 22, and a lower cover 23. The rotating housing 15 is characterized by having a drive gear 4 that meshes with a drive disc 3, the drive disc 3 being fixed to the drive shaft 1; two pairs of worm gear assemblies 6 are symmetrically arranged inside the rotating housing 15, each pair connected to a rotating shaft 7; one end of a single-sided rotating shaft 70 is provided with a locking block 8, and the rotating housing 15 has a corresponding axially movable locking groove 9, the locking groove 9 being connected to a magnetic suction device 11 via a connecting shaft 10. The locking slot 9 includes 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 outer ring second locking block 92 is engaged with the second locking groove 21 of the rotating housing 15. When the corresponding single-sided rotating shaft 70 is locked, the magnetic attraction device 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. By setting the locking slot 9 and locking block 8 structure driven by the magnetic attraction device 11, active and electrically controlled locking is achieved.

[0032] 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 24. This arrangement provides support at both ends of the rotating shaft 7, improving the support rigidity and rotational accuracy of the rotating shaft 7.

[0033] The snap-fit ​​block 8 and the inner ring groove 91 of the snap-fit ​​slot 9 are engaged through a spline structure; the spline connection has the advantages of strong load-bearing capacity, good centering and smooth transmission, ensuring that the locking mechanism is reliably engaged under high-speed rotation and high torque transmission conditions, without impact or disengagement, and with high transmission efficiency.

[0034] A spring 12 is fitted onto the connecting shaft 10. One end of the spring 12 abuts against the locking slot 9, and the other end abuts against the limiting member 13 of the rotating housing 15. Under normal conditions, the spring 12 is in a relaxed state, keeping the locking slot 9 in the locking position between the outer ring second locking block 92 and the second locking groove 21. When the magnetic attraction device 11 is activated, it compresses the spring 12, causing the locking slot 9 to move to the locking position. After the magnetic force disappears, the spring 12 resets the locking slot 9. The magnetic attraction device 11 is a combination structure of an electromagnet or permanent magnet and an electromagnetic coil. The magnetic force generated by its energization drives the connecting shaft 10 to move axially. The engagement and disengagement of the locking mechanism can be precisely controlled by simple energization / de-energization, which is convenient for integration into the vehicle's electronic control system to achieve intelligent and automated control. The axial movement path of the locking slot 9 is limited by the guiding structure of the rotating housing 15, ensuring the alignment of the inner ring slot 91 with the locking block 8 and the matching accuracy of the outer ring second locking block 92 with the second locking groove 21.

[0035] The worm gear assembly 6 includes a turbine 61 fixed to the rotating shaft 7 and at least two worms 62 arranged around the turbine 61. The two ends of each worm 62 are rotatably supported on the rotating housing 15, and the gear discs of adjacent worms 62 mesh with each other. This allows the transmission system to naturally suppress freewheeling even without a locking mechanism when one wheel is suspended or slipping, providing basic slip restriction capability and forming a passive + active dual guarantee with the electromagnetic locking mechanism. There are three worms 62 evenly distributed at 120° intervals, and the gear discs of each worm 62 mesh sequentially to form a linkage structure, improving the load-bearing capacity and transmission smoothness of the assembly. The two pairs of worm gear assemblies 6 are mirror-symmetrically arranged with the drive shaft 1 as the center line, ensuring complete force balance within the entire differential.

[0036] 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 rotating housing 15; the large torque of the drive shaft 1 is efficiently and smoothly transmitted to the rotating housing 15, reducing the impact and energy loss in the transmission process.

[0037] The beneficial effects of this utility model are as follows: An electromagnetically driven lockable limited-slip differential uses a magnetic attraction device 11 to directly drive the axial movement of the locking slot 9. Electromagnetic force enables the locking block 8 to quickly engage or disengage from the inner ring groove 91, allowing for real-time responses to sudden changes in road surface adhesion conditions. This avoids the power waste caused by the lag in gear separation in traditional mechanical structures, improving the vehicle's ability to get out of trouble in complex road conditions such as ice, snow, and mud. A spline structure ensures precise engagement between the locking block 8 and the inner ring groove 91, and the symmetrical layout design of the worm gear assembly 6 ensures stable and efficient torque transmission. The spring 12 on the coupling shaft 10 automatically resets the locking slot 9, eliminating the need for complex mechanical linkage components, simplifying the overall structure, and extending the equipment's service life. Furthermore, it achieves rapid and precise locking and releasing, improving the vehicle's passability and stability on low-traction surfaces.

[0038] 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. An electromagnetically driven lockable limited-slip differential, comprising a drive shaft (1), a housing (2), and a rotating housing (15), wherein the housing (2) comprises a bridge housing (24), an upper cover (22), and a lower cover (23), characterized in that: The rotating housing (15) is provided with a drive gear (4) that meshes with the drive disk (3), and the drive disk (3) is fixed to the drive shaft (1); two pairs of worm gear assemblies (6) are symmetrically arranged inside the rotating housing (15), and each pair of assemblies is connected to a rotating shaft (7); one end of one side of the rotating shaft (70) is provided with a snap-fit ​​block (8), and the rotating housing (15) is provided with a snap-fit ​​groove (9) that can move axially at the corresponding position. The snap-fit ​​groove (9) is connected to a magnetic suction device through a connecting shaft (10). (11); The snap-fit ​​slot (9) includes an inner ring slot (91) and an outer ring second snap block (92). Under normal conditions, the snap-fit ​​block (8) is separated from the inner ring slot (91) and the outer ring second snap block (92) is snapped into the second snap slot (21) of the rotating housing (15). When the corresponding single-sided rotating shaft (70) is locked, the magnetic suction device (11) drives the connecting shaft (10) to move the snap-fit ​​slot (9) axially, so that the inner ring slot (91) is snapped into the snap block (8), and the two rotating shafts are forced to synchronize.

2. The electromagnetically 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 (24).

3. The electromagnetically 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. The electromagnetically driven lockable limited-slip differential as described in claim 1, characterized in that: A spring (12) is fitted on the connecting shaft (10). One end of the spring (12) abuts against the snap-fit ​​slot (9), and the other end abuts against the limiting member (13) of the rotating housing (15). Under normal conditions, the spring (12) is in a relaxed state, so that the snap-fit ​​slot (9) keeps the outer ring second snap block (92) and the second snap slot (21) in the snap-fit ​​position. When the magnetic attraction device (11) is activated, the spring (12) is compressed, so that the snap-fit ​​slot (9) moves to the snap-fit ​​position. After the magnetic force disappears, the spring (12) resets the snap-fit ​​slot (9).

5. The electromagnetically driven lockable limited-slip differential as described in claim 4, characterized in that: The magnetic attraction device (11) is a combination structure of an electromagnet or permanent magnet and an electromagnetic coil. The magnetic force generated by its energization drives the connecting shaft (10) to move axially.

6. The electromagnetically driven lockable limited-slip differential as described in claim 4, characterized in that: The axial movement path of the snap-fit ​​slot (9) is limited by the guide structure of the rotating housing (15), ensuring the alignment of the inner ring slot (91) with the snap-fit ​​block (8) and the fitting accuracy of the outer ring second snap-fit ​​block (92) with the second snap-fit ​​slot (21).

7. An electromagnetically driven lockable limited-slip differential as described in claim 2, characterized in that: The worm gear assembly (6) includes a turbine (61) fixed to a rotating shaft (7) and at least two worms (62) arranged around the turbine (61). The two ends of the worms (62) are rotatably supported on a rotating housing (15), and the gear discs of adjacent worms (62) mesh with each other.

8. The electromagnetically 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 sequentially to form a linkage structure.

9. An electromagnetically 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. An electromagnetically 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 rotating housing (15).

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