Electromagnetic differential lock

Abstract

An electromagnetic differential lock comprises a differential mechanism shell, a half axle gear, an electromagnetic coil assembly and a sliding sleeve assembly, the half axle gear is installed on the left side of the differential mechanism shell, combination teeth are arranged between the axial end face of the half axle gear and the differential mechanism shell, and a gasket is arranged at the connecting position of the half axle gear and the differential mechanism shell. The sliding sleeve assembly and the electromagnetic coil assembly are arranged on the right side of the differential mechanism shell, the sliding sleeve assembly is fixedly connected with the combination teeth, the sliding assembly comprises a magnetism isolating sleeve and a magnetism conducting sleeve, the magnetism isolating sleeve is arranged in the magnetism conducting sleeve, and a wave spring is axially arranged between the magnetism isolating sleeve and the differential mechanism shell. According to the electromagnetic differential lock, the structural arrangement of each part is optimized, and the working environment of the wave spring is adjusted, so that the risk of part failure is reduced.

Description

Technical Field

[0001] The present invention relates to the field of differential locks, and particularly to an electromagnetic differential lock. Background Art

[0002] As Figure 1 、 Figure 2 shown, a common existing electric control type differential lock electric drive solution includes a differential housing (1), a first gasket (2), a second gasket (3), a half shaft gear engaging tooth (4), a wave spring (5), an engaging tooth (6), an electromagnetic coil assembly (7), a sliding sleeve assembly (8), and a coil pressing plate (9); wherein the sliding sleeve assembly (8) is composed of a magnetic isolation sleeve (8-1) and a magnetic conduction sleeve (8-2).

[0003] The wave spring (5) of this solution is installed from the left side of the differential housing (1) and is located between the engaging tooth (6) and the half shaft gear engaging tooth (4); the engaging tooth (8) is installed from the left side of the differential housing (1), and its claw structure is used to achieve speed synchronization with the differential housing (1); the sliding sleeve assembly (8) is installed from the right side of the differential housing (1). After the electromagnetic coil assembly (7) is energized, the sliding sleeve assembly (8) moves from the right end to the left end, and its claw structure is used to push the corresponding position of the engaging tooth (6), so that the small engaging tooth on the engaging tooth (6) is connected to the corresponding engaging tooth on the half shaft gear engaging tooth (4), thereby achieving speed synchronization between the half shaft gear engaging tooth (4) and the differential housing (1) and realizing the locking function of the differential parts. After the electromagnetic coil assembly (7) is powered off, the wave spring (5) returns to its original position and pushes the engaging tooth (6) to move to the right, so that the engaging tooth (6) is disengaged from the half shaft gear engaging tooth (4), realizing the unlocking function of the differential parts.

[0004] The existing defects of this solution are: 1. The wave spring is located between the engaging tooth and the half shaft gear engaging tooth. In the unlocked state, the wave spring will be continuously worn due to the rotational speed difference between the half shaft gear engaging tooth and the differential housing, thus affecting the service life of the wave spring; in the design process of the wave spring, the influence of the rotational speed difference on both sides of the wave spring needs to be considered, and a relative rotation test needs to be added to the wave spring, resulting in relatively high upfront development costs.

[0005] 2. The wave spring is located between the engaging tooth and the half shaft gear engaging tooth. When starting to unlock, the wave spring first pushes the engaging tooth, and there is a relatively large radial guiding gap between the engaging tooth and the half shaft gear engaging tooth, so the engaging tooth is prone to skew, resulting in the wave spring not being able to return to its original position completely. Summary of the Invention

[0006] The object of the present invention is to provide an electromagnetic differential lock in view of the deficiencies of the corresponding prior art. This electromagnetic differential lock optimizes the structural arrangement of each part and adjusts the working environment of the wave spring, thereby reducing the risk of part failure.

[0007] The object of the present invention is achieved by the following solution: An electromagnetic differential lock includes a differential housing, a half shaft gear, an electromagnetic coil assembly, and a sliding sleeve assembly. The half shaft gear is installed on the left side of the differential housing. A coupling tooth is provided between the axial end face of the half shaft gear and the differential housing, and a gasket is provided between the connection between the half shaft gear and the differential housing. The sliding sleeve assembly and the electromagnetic coil assembly are arranged on the right side of the differential housing. The sliding sleeve assembly is fixedly connected to the coupling tooth. The sliding assembly includes a magnetic isolation sleeve and a magnetic conduction sleeve. The magnetic isolation sleeve is arranged in the magnetic conduction sleeve, and a wave spring is axially arranged between the magnetic isolation sleeve and the differential housing.

[0008] On the left end face of the coupling tooth, an end face coupling tooth is provided to cooperate with the end face coupling tooth on the half shaft gear of the half shaft gear. On the right end face of the coupling tooth, a plurality of coupling tooth claws are evenly arranged. Threaded holes are provided on the coupling tooth claws. The coupling tooth is fixedly connected to the sliding sleeve assembly by screws, and coupling tooth bosses are provided between the respective coupling tooth claws.

[0009] The electromagnetic coil assembly is fixed to the right side of the differential housing by a coil pressing plate.

[0010] The coil pressing plate is in interference fit with the differential housing in the radial direction.

[0011] The gasket includes gasket one and gasket two, and at least one gasket is provided between the connection between the half shaft gear and the differential housing.

[0012] On the outer circumference of the magnetic isolation sleeve, a plurality of magnetic isolation sleeve claws extending to the left are evenly arranged, and threaded through holes are provided on the magnetic isolation sleeve claws.

[0013] On the left side of the differential housing, a radial relief hole for the end face coupling tooth of the half shaft gear, an axial relief hole for the end face coupling tooth of the half shaft gear, a lubricating oil groove, and a gasket positioning surface are provided. On the right side of the differential housing, a wave spring installation groove is provided.

[0014] The wave spring is in clearance fit with the differential housing.

[0015] The magnetic isolation sleeve is made of stainless steel.

[0016] The magnetic conduction sleeve is a circumferential ring structure and is made of a pure iron-based material.

[0017] The advantages of the present invention are as follows: 1. The wave spring of the present invention is placed between the differential housing and the sliding sleeve assembly. At any time, there is no relative rotational movement between the wave spring and the two-side parts, and only the functions of compression and recovery of the wave spring are retained. Therefore, the failure risk of the wave spring and the verification cost of the preliminary development are reduced.

[0018] 2. When the unlocking action is realized in the present invention, the sliding sleeve assembly is first pushed by the wave spring, reducing the risk that the wave spring cannot fully return to its position to achieve the unlocking function. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the arrangement of the electronically controlled differential lock of the prior art; Figure 2 is a schematic diagram of the sliding sleeve assembly in the electronically controlled differential lock of the prior art; Figure 3 is a schematic diagram of the structure of the present invention; Figure 4 is a schematic diagram of the sliding sleeve assembly of the present invention; Figure 5 is a schematic diagram of the structure of the magnetic isolation sleeve of the present invention; Figure 6 is a schematic diagram of the structure of the magnetic conductive sleeve of the present invention; Figure 7 is a schematic diagram of the right-side structure of the engaging tooth of the present invention; Figure 8 is a schematic diagram of the left-side structure of the engaging tooth of the present invention; Figure 9 is a schematic diagram of the structure of the half shaft gear of the present invention; Figure 10 is a schematic diagram of the right side of the differential housing of the present invention; Figure 11 is a schematic diagram of the left side of the differential housing of the present invention; Figure 12 is a schematic diagram of the engagement of the half shaft gear and the engaging tooth when the present invention is locked; DETAILED DESCRIPTION OF THE INVENTION

[0020] As Figures 1 to 12As shown in the figure, an electromagnetic differential lock includes a differential housing 1, a half shaft gear 4, an electromagnetic coil assembly 7, and a sliding sleeve assembly 8. On the left side of the differential housing 1, there are a radial relief hole 1-4 for the end face engaging teeth of the half shaft gear, an axial relief hole 1-5 for the end face engaging teeth of the half shaft gear, a lubricating oil groove 1-6, and a gasket positioning surface 1-3. On the right side of the differential housing 1, there is a wave spring installation groove 1-2. The radial relief hole 1-4 for the end face engaging teeth of the half shaft gear, the axial relief hole 1-5 for the end face engaging teeth of the half shaft gear, and the lubricating oil groove 1-6 together form a lubrication channel for the half shaft gear 4 and the engaging teeth 6. The gasket positioning surface 1-3 provides axial positioning for the gasket and the half shaft gear 4. The wave spring installation groove 1-2 facilitates the smooth installation of the engaging teeth 6 and the axial positioning of the wave spring 5, and at the same time provides radial positioning and axial guidance for the engaging teeth 6. The half shaft gear 4 is installed on the left side of the differential housing 1. An engaging tooth 6 is provided between the axial end face of the half shaft gear 4 and the differential housing 1. A gasket is provided between the connection of the half shaft gear 4 and the differential housing 1. The gasket includes a first gasket 2 and a second gasket 3. At least one gasket is provided between the connection of the half shaft gear 4 and the differential housing 1. The number of gaskets is set according to actual requirements. The sliding sleeve assembly 8 and the electromagnetic coil assembly 7 are arranged on the right side of the differential housing 1. The electromagnetic coil assembly 7 is fixed to the right side of the differential housing 1 by a coil pressing plate 9. The coil pressing plate 9 restricts the axial position of the electromagnetic coil assembly 7. The coil pressing plate 9 is in radial interference fit with the differential housing 1 to achieve radial positioning and prevent loosening during transportation and operation. The axial position is accurately controlled by a tooling for axial displacement. The sliding sleeve assembly 8 is connected and fixed to the engaging teeth 6. The sliding assembly 8 includes a magnetic isolation sleeve 8-1 and a magnetic conducting sleeve 8-2. The magnetic isolation sleeve 8-1 is arranged in the magnetic conducting sleeve 8-2. A plurality of magnetic isolation sleeve claws 8-1-1 extending to the left are evenly arranged on the outer circumference of the magnetic isolation sleeve 8-1. A threaded through hole 8-1-2 is provided on the magnetic isolation sleeve claw 8-1-1. The magnetic isolation sleeve 8-1 is made of stainless steel. The magnetic isolation sleeve 8-1 made of stainless steel can ensure that the magnetic conducting sleeve 8-2 receives a stable electromagnetic force axially. The magnetic conducting sleeve 8-2 is a circular ring structure and is made of a pure iron material. A wave spring 5 is axially arranged between the magnetic isolation sleeve 8-1 and the differential housing 1. The wave spring 5 is in clearance fit with the differential housing 1. On the left end face of the engaging teeth 6, there is an end face engaging tooth 6-1 that cooperates with the end face engaging tooth 4-1 on the half shaft gear 4. On the right end face of the engaging teeth 6, a plurality of engaging tooth claws 6-3 are evenly arranged. The engaging tooth claws 6-3 are inserted through the same number of relief holes provided on the differential housing 1 to achieve synchronous rotation of the engaging teeth 6 and the differential housing 1. An internal threaded hole 6-4 is provided on the engaging tooth claw 6-3. The engaging teeth 6 are connected and fixed to the sliding sleeve assembly 8 by screws 10. An engaging tooth boss 6-2 is provided between the engaging tooth claws 6-3. The engaging tooth boss 6-2 can cancel the axial limit when energized.

[0021] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention fall within the protection scope of the present invention.

Claims

1. An electromagnetic differential lock, comprising a differential case (1), a half shaft gear (4), an electromagnetic coil assembly (7) and a sliding sleeve assembly (8). The half shaft gear (4) is installed on the left side of the differential case (1). A coupling tooth (6) is arranged between the axial end face of the half shaft gear (4) and the differential case (1). A gasket is arranged between the connection part of the half shaft gear (4) and the differential case (1). It is characterized in that: The sliding sleeve assembly (8) and the electromagnetic coil assembly (7) are arranged on the right side of the differential housing (1). The sliding sleeve assembly (8) is fixedly connected to the engaging teeth (6). The sliding assembly (8) includes a magnetic isolation sleeve (8-1) and a magnetic conductive sleeve (8-2). The magnetic isolation sleeve (8-1) is arranged in the magnetic conductive sleeve (8-2). A wave spring (5) is axially arranged between the magnetic isolation sleeve (8-1) and the differential housing (1).

2. The electromagnetic differential lock according to claim 1, wherein: On the left end face of the engaging teeth (6), there is an end face engaging tooth (6-1) that mates with the end face engaging tooth (4-1) on the half shaft gear (4). On the right end face of the engaging teeth (6), a plurality of engaging tooth claws (6-3) are evenly arranged. An internal threaded hole (6-4) is arranged on the engaging tooth claw (6-3). The engaging teeth (6) are fixedly connected to the sliding sleeve assembly (8) by screws (10). An engaging tooth boss (6-2) is arranged between the engaging tooth claws (6-3).

3. The electromagnetic differential lock according to claim 1, wherein: The electromagnetic coil assembly (7) is fixed to the right side of the differential housing (1) by a coil pressing plate (9).

4. The electromagnetic differential lock according to claim 3, wherein: The coil pressing plate (9) is in interference fit with the differential housing (1) in the radial direction.

5. The electromagnetic differential lock according to claim 1, characterized in that: The gasket includes a first gasket (2) and a second gasket (3). At least one gasket is arranged between the connection positions of the half shaft gear (4) and the differential housing (1).

6. The electromagnetic differential lock according to claim 1, wherein: On the outer circumference of the magnetic isolation sleeve (8-1), a plurality of magnetic isolation sleeve claws (8-1-1) extending to the left are evenly arranged. A threaded through hole (8-1-2) is arranged on the magnetic isolation sleeve claw (8-1-1).

7. The electromagnetic differential lock according to claim 1, characterized in that: On the left side of the differential housing (1), there are a radial relief hole (1-4) for the end face engaging tooth of the half shaft gear, an axial relief hole (1-5) for the end face engaging tooth of the half shaft gear, a lubricating oil groove (1-6), and a gasket positioning surface (1-3). On the right side of the differential housing (1), there is a wave spring installation groove (1-2).

8. The electromagnetic differential lock according to claim 1, characterized in that: The wave spring (5) is in clearance fit with the differential housing (1).

9. The electromagnetic differential lock according to claim 1, wherein: The magnetic isolation sleeve (8-1) is made of stainless steel.

10. The electromagnetic differential lock according to claim 1, wherein: The magnetic conductive sleeve (8-2) is a circumferential ring structure and is made of a pure iron material.

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