Electromagnetic differential mechanism

Abstract

The utility model belongs to the technical field of differential mechanisms, and particularly relates to an electromagnetic differential mechanism which comprises a front shell and a rear shell, a cavity is formed between the front shell and the rear shell, a front bevel gear, a rear bevel gear and a planetary gear are arranged in the cavity, a locking ring is arranged in the cavity, and meshing inner teeth are arranged on the inner ring of the locking ring. A reset spring is arranged between the front side face of the locking ring and the cavity, the rear side face of the locking ring abuts against the inner end of the pushing pin shaft, an electromagnetic coil is arranged between the rear shell and the corresponding bearing seat, a pushing assembly is arranged between the electromagnetic coil and the rear shell, and a plane bearing and a positioning spring are arranged between the pushing assembly and the corresponding bearing. The front side face of the pushing assembly is provided with a driving inclined face, and the outer end of the pushing pin shaft abuts against the driving inclined face. The locking device is simple in structure, reasonable in design and low in cost, the pushing pin shaft can push the locking ring to move axially to lock the differential mechanism by means of the mode that the electromagnetic coil adsorbs and fixes the pushing assembly, the overall size of the locking device is shortened, transmission is stable and reliable, and locking response is fast.

Description

Technical field:

[0001] The utility model belongs to the technical field of differentials, in particular to an electromagnetic differential. Background technology:

[0002] An existing utility model patent (authorization announcement number CN215806131U) discloses a pneumatic locking differential, which includes a front shell and a rear shell, a chamber is formed between the front shell and the rear shell, a front bevel gear, a rear bevel gear, and a planetary gear are arranged in the chamber, the rear bevel gear is provided with meshing external teeth, a locking ring is arranged in the chamber, the inner ring of the locking ring is provided with meshing internal teeth, a return spring is arranged between the front side surface of the locking ring and the chamber, the rear side surface is abutted against a sealing ring that can move axially in the chamber, a driving air cavity is formed between the sealing ring and the corresponding side wall of the chamber, and a driving air duct is opened on the chamber.

[0003] However, the air tightness of the driving air chamber formed by the sealing ring and the cavity depends entirely on the axially moving sealing ring, and the sealing ring needs to frequently move axially in the chamber, which will inevitably cause the sealing ring to wear, thereby causing air leakage in the driving air duct, and eventually the differential lock may become unstable. Summary of the invention:

[0004] The utility model aims to provide an electromagnetic differential, and the technical problem to be solved is how to improve the locking stability of the differential.

[0005] The utility model is achieved in this way:

[0006] An electromagnetic differential comprises a front shell and a rear shell respectively connected to corresponding bearing seats through bearings, a chamber is formed between the front shell and the rear shell, a front bevel gear, a rear bevel gear, and a planetary gear meshing with the front bevel gear and the rear bevel gear are arranged in the chamber, a locking ring which is circumferentially fixed to the chamber and can move axially, an inner ring of the locking ring is provided with meshing inner teeth which can be axially displaced and meshed with the rear bevel gear, a reset spring is arranged between the front side surface of the locking ring and the chamber, and the rear side surface abuts against the inner end of the push pin shaft, an electromagnetic coil which is circumferentially fixed to the corresponding bearing seat is arranged between the rear shell and the corresponding bearing seat, a pusher assembly which can be electromagnetically adsorbed by the electromagnetic coil is arranged between the electromagnetic coil and the rear shell, and a plane bearing and a positioning spring are arranged between the pusher assembly and the corresponding bearing, the front side surface of the pusher assembly has a driving inclined surface, the outer end of the pusher pin shaft extends out of the rear shell and abuts against the driving inclined surface, the electromagnetic coil is energized to adsorb and fix the pusher assembly, and the rear shell drives the pusher pin shaft to move relative to the driving inclined surface to push the locking ring to mesh with the rear bevel gear.

[0007] In the above-mentioned electromagnetic differential, a circumferential positioning protrusion is formed on the rear end surface of the electromagnetic coil extending backward, and a circumferential positioning groove for the circumferential positioning protrusion to be inserted and fixed is formed on the corresponding bearing seat.

[0008] In the above-mentioned electromagnetic differential, the pushing assembly includes a pushing block located on the inner ring side of the electromagnetic coil, and a suction plate mounted on the pushing block and capable of being electromagnetically adsorbed by the electromagnetic coil, the suction plate is circumferentially fixed to the pushing block, the driving inclined surface is arranged on the front side surface of the pushing block, the rear side surface of the pushing block abuts against the plane bearing, the other side surface of the plane bearing abuts against a positioning ring, and the positioning spring is arranged between the positioning ring and the corresponding bearing.

[0009] In the above electromagnetic differential, the inner ring side wall of the suction plate extends radially inward to form a circumferential fixing protrusion, and the front side surface of the pusher block is provided with a circumferential fixing groove plug-fitted with the circumferential fixing protrusion.

[0010] In the above-mentioned electromagnetic differential, the driving inclined plane is in a V-shaped structure, and a plurality of the driving inclined planes are evenly distributed in the circumferential direction, and the number and position of the propulsion pin shafts correspond one to one with the driving inclined planes.

[0011] The outstanding advantages of the utility model compared with the prior art are:

[0012] The utility model has a simple structure, reasonable design and low cost. By means of the electromagnetic coil adsorbing and fixing the pushing assembly, the pushing pin can push the locking ring to move axially to achieve the locking of the differential. The overall volume is shortened, the transmission is stable and reliable, and the locking response is faster. Description of the drawings:

[0013] Figure 1 It is an overall exploded view of the utility model.

[0014] In the figure: 1, front shell; 2, rear shell; 3, bearing; 4, bearing seat; 5, front bevel gear; 6, rear bevel gear; 7, planetary gear; 8, locking ring; 9, meshing internal teeth; 10, reset spring; 11, push pin; 12, electromagnetic coil; 13, plane bearing; 14, positioning spring; 15, driving inclined surface; 16, circumferential positioning protrusion; 17, circumferential positioning groove; 18, pusher block; 19, suction piece; 20, positioning ring; 21, circumferential fixing protrusion; 22, circumferential fixing groove. Specific implementation method:

[0015] The present invention is further described below with reference to specific embodiments. Figure 1 :

[0016] An electromagnetic differential comprises a front shell 1 and a rear shell 2 respectively connected to corresponding bearing seats 4 through bearings 3, a chamber is formed between the front shell 1 and the rear shell 2, a front bevel gear 5, a rear bevel gear 6, and a planetary gear 7 meshing with the front bevel gear 5 and the rear bevel gear 6 are arranged in the chamber, a locking ring 8 is arranged in the chamber which is circumferentially fixed to the chamber and can move axially, the inner ring of the locking ring 8 is provided with meshing inner teeth 9 which can be axially displaced and can mesh with the rear bevel gear 6, a reset spring 10 is arranged between the front side surface of the locking ring 8 and the chamber, and the rear side surface abuts against the inner end of the propulsion pin 11, and the rear shell 2 and the rear bevel gear 6 are arranged in the chamber. An electromagnetic coil 12 is arranged between the corresponding bearing seats 4 and is circumferentially fixed to the corresponding bearing seats 4. A pushing assembly that can be electromagnetically attracted by the electromagnetic coil 12 is arranged between the electromagnetic coil 12 and the rear shell 2, and a plane bearing 13 and a positioning spring 14 are arranged between the pushing assembly and the corresponding bearing 3. The front side surface of the pushing assembly has a driving inclined surface 15, and the outer end of the pushing pin shaft 11 extends out of the rear shell 2 and abuts against the driving inclined surface 15. The electromagnetic coil 12 is energized to attract and fix the pushing assembly, and the rear shell 2 drives the pushing pin shaft 11 to move relative to the driving inclined surface 15 to push the locking ring 8 to engage with the rear bevel gear 6.

[0017] The locking working principle is as follows: the electromagnetic coil 12 is energized to absorb and fix the pusher assembly, so that the rear housing 2 drives the push pin 11 to move relative to the driving inclined surface 15, and then the push pin 11 pushes the locking ring 8 inward until it meshes with the rear bevel gear 6. Since the locking ring 8 is circumferentially fixed to the rear housing 2, the locking ring 8, the rear housing 2 and the rear bevel gear 6 form a rigid connection, so that the entire differential forms a rigid connection;

[0018] At the same time, considering that when the electromagnetic coil 12 is energized, the pusher assembly will generate a recoil force when the push pin 11 moves relative to the driving inclined surface 15, the plane bearing 13 and the positioning spring 14 are used to make the pusher assembly stable and easy to rotate;

[0019] When the electromagnetic coil 12 is not energized, the elastic force of the return spring 10 acts on the locking ring 8, so that the locking ring 8 is meshed and separated from the rear bevel gear 6, thereby achieving the purpose of unlocking.

[0020] The utility model has a simple structure, reasonable design and low cost. By means of the electromagnetic coil 12 adsorbing and fixing the pusher assembly, the push pin 11 can push the locking ring 8 to move axially to achieve the locking of the differential. The overall volume is shortened, the transmission is stable and reliable, and the locking response is faster.

[0021] The electromagnetic coil 12 and the bearing seat 4 can be fixed directly by fasteners. In the present embodiment, the rear end surface of the electromagnetic coil 12 extends backward to form a circumferential positioning protrusion 16, and the corresponding bearing seat 4 is provided with a circumferential positioning groove 17 for the circumferential positioning protrusion 16 to be inserted and fixed.

[0022] At the same time, in order to make the overall structure more compact, the specific composition structure of the pushing assembly is as follows: the pushing assembly includes a pushing block 18 located on the inner ring side of the electromagnetic coil 12, and a suction piece 19 sleeved on the pushing block 18 and capable of being electromagnetically adsorbed by the electromagnetic coil 12, the suction piece 19 is circumferentially fixed to the pushing block 18, the driving inclined surface 15 is arranged on the front side surface of the pushing block 18, the rear side surface of the pushing block 18 abuts against the plane bearing 13, and the other side surface of the plane bearing 13 abuts against a positioning ring 20, and the positioning spring 14 is arranged between the positioning ring 20 and the corresponding bearing 3.

[0023] Moreover, the connection between the suction piece 19 and the pushing block 18 can be an integrated structure. In the present embodiment, the inner ring side wall of the suction piece 19 extends radially inward to form a circumferential fixing protrusion 21, and the front side surface of the pushing block 18 is provided with a circumferential fixing groove 22 which is plugged into and cooperates with the circumferential fixing protrusion 21.

[0024] In addition, in order to enable the locking ring 8 to be stably pushed by the push pin 11 to move axially, the driving inclined surface 15 is V-shaped and has a plurality of them evenly distributed circumferentially. The number and position of the push pin 11 and the driving inclined surface 15 correspond one to one.

[0025] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An electromagnetic differential, comprising a front shell (1) and a rear shell (2) connected to corresponding bearing seats (4) respectively through bearings (3), a chamber is formed between the front shell (1) and the rear shell (2), a front bevel gear (5), a rear bevel gear (6), and a planetary gear (7) meshing with the front bevel gear (5) and the rear bevel gear (6) are arranged in the chamber, a locking ring (8) is arranged in the chamber and is circumferentially fixed to the chamber and can move axially, and an inner ring of the locking ring (8) is provided with meshing internal teeth (9) that can be axially displaced and mesh with the rear bevel gear (6), characterized in that: A return spring (10) is provided between the front side of the locking ring (8) and the chamber, and the rear side abuts against the inner end of the push pin shaft (11). An electromagnetic coil (12) circumferentially fixed to the corresponding bearing seat (4) is provided between the rear shell (2) and the corresponding bearing seat (4). A push assembly that can be electromagnetically attracted by the electromagnetic coil (12) is provided between the electromagnetic coil (12) and the rear shell (2), and a plane bearing (13) and a positioning spring (14) are provided between the push assembly and the corresponding bearing (3). The front side of the push assembly has a driving inclined surface (15), and the outer end of the push pin shaft (11) extends out of the rear shell (2) and abuts against the driving inclined surface (15). When the electromagnetic coil (12) is energized, it attracts and fixes the push assembly, and the rear shell (2) drives the push pin shaft (11) to move relative to the driving inclined surface (15), thereby pushing the locking ring (8) to engage with the rear bevel gear (6).

2. An electromagnetic differential according to claim 1, characterized in that: The rear end surface of the electromagnetic coil (12) extends backward to form a circumferential positioning protrusion (16), and the corresponding bearing seat (4) is provided with a circumferential positioning groove (17) for the circumferential positioning protrusion (16) to be inserted and fixed.

3. The electromagnetic differential according to claim 1, characterized in that: The pusher assembly comprises a pusher block (18) located on the inner ring side of the electromagnetic coil (12), and a suction piece (19) sleeved on the pusher block (18) and capable of being electromagnetically attracted by the electromagnetic coil (12); the suction piece (19) and the pusher block (18) are circumferentially fixed; the driving inclined surface (15) is arranged on the front side of the pusher block (18); the rear side of the pusher block (18) abuts against the plane bearing (13); the other side of the plane bearing (13) abuts against a positioning ring (20); and the positioning spring (14) is arranged between the positioning ring (20) and the corresponding bearing (3).

4. The electromagnetic differential according to claim 3, characterized in that: The inner ring side wall of the suction piece (19) extends radially inward to form a circumferential fixing protrusion (21), and the front side surface of the pushing block (18) is provided with a circumferential fixing groove (22) plug-fitted with the circumferential fixing protrusion (21).

5. The electromagnetic differential according to claim 1, characterized in that: The driving inclined surface (15) is in a V-shaped structure and is evenly distributed in a circumferential direction. The number and position of the propulsion pin shaft (11) and the driving inclined surface (15) correspond one to one.

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