A hydraulic differential lock actuator arrangement for a drive axle

Abstract

The utility model discloses a kind of hydraulic differential lock executor arrangement structures for drive axle, its characteristics are, by differential lock cylinder, hydraulic oil pipe joint, small piston, small piston O-ring, big piston, big piston O-ring, return spring, yoke, differential lock signal switch, reducer shell composition;Differential lock cylinder is connected with reducer shell;Hydraulic oil pipe joint and differential lock signal switch are equipped on differential lock cylinder, and small piston is equipped in the piston hole of differential lock cylinder;Big piston is equipped in the piston hole of reducer shell;Big piston is sleeved with yoke and return spring, return spring one end and yoke end surface contact, the other end and reducer shell end surface contact;With simple structure, hydraulic oil and gear oil independent sealing, high reliability, oil leakage identifiable and the like characteristics;It is suitable for using hydraulic control differential lock work's drive axle assembly.

Description

Technical Field

[0001] This utility model relates to the field of vehicle axle technology, specifically a hydraulic differential lock actuator arrangement structure for drive axles, suitable for drive axle assemblies that use hydraulically controlled differential locks. Background Technology

[0002] With the development of vehicle technology, vehicle braking systems can be arranged as electronic braking or hydraulic braking. However, to enable the operation of traditional pneumatic differential locks, the pneumatic system must still be retained, which not only complicates the chassis layout but also increases the overall vehicle cost. To reduce chassis complexity and costs, the existing pneumatic differential lock mechanism is usually kept unchanged, and the power source is simply changed to hydraulic oil. In this structure, the piston O-ring seals lubricating oil on one side and hydraulic oil on the other. When the O-ring fails, the hydraulic oil and lubricating oil mix, significantly reducing the performance of the lubricating oil and causing damage to the reducer gears and bearings. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a hydraulic differential lock actuator arrangement structure for drive axles.

[0004] The technical solution provided by this utility model is: a hydraulic differential lock actuator arrangement structure for a drive axle, characterized in that it comprises a differential lock cylinder body, a hydraulic oil pipe joint, a small piston, a small piston O-ring, a large piston, a large piston O-ring, a return spring, a shift fork, a differential lock signal switch, and a reducer housing; the differential lock cylinder body is connected to the reducer housing; the differential lock cylinder body is provided with a hydraulic oil pipe joint; a small piston is provided in the piston hole of the differential lock cylinder body; a small piston O-ring is provided in the annular groove of the small piston; a large piston is provided in the piston hole of the reducer housing; a large piston O-ring is provided in the annular groove of the large piston; the shift fork is mounted on the large piston; the return spring is mounted on the large piston, with one end of the return spring contacting the end face of the shift fork and the other end contacting the end face of the reducer housing; a differential lock signal switch is provided on the differential lock cylinder body.

[0005] Furthermore, the differential lock cylinder body is provided with an oil passage hole and a first piston hole, which are connected; the small piston is installed at the position of the first piston hole.

[0006] Furthermore, the small piston is provided with a first annular groove, the small piston O-ring is installed in the first annular groove, and the small piston O-ring is installed together with the small piston at the first piston hole position on the differential lock cylinder body.

[0007] Furthermore, a second piston hole is provided on the reducer housing.

[0008] Furthermore, the large piston is provided with a second annular groove, and the large piston O-ring is installed in the second annular groove. The large piston O-ring is installed together with the large piston at the second piston hole position on the reducer housing.

[0009] Furthermore, the end face of the large piston and the end face of the small piston are in contact.

[0010] Furthermore, the differential lock signal switch is provided with axially retractable contacts.

[0011] Furthermore, the large piston is provided with a conical surface. When the large piston moves axially, the conical surface on the large piston contacts the contacts on the differential lock signal switch, and the contacts are compressed.

[0012] Furthermore, the differential lock cylinder body is connected to the reducer housing via differential lock cylinder body fastening bolts.

[0013] Furthermore, the hydraulic oil pipe joint is connected to the differential lock cylinder body via a thread.

[0014] The beneficial effects of this utility model are: 1. By adding a small piston, the hydraulic oil and gear oil are sealed and separated, improving reliability; 2. When the O-ring seal fails, it can be identified by the oil leakage at the housing mating surface, and treatment can be carried out in advance to prevent the mixing of two different oils from causing damage to the parts. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] In the diagram: 1. Differential lock cylinder body, 1a. First threaded hole, 1b. Second threaded hole, 1c. Oil passage hole, 1d. First piston hole, 2. Differential lock cylinder body fastening bolt, 3. Hydraulic oil pipe connector, 4. Small piston, 4a. First ring groove, 5. Small piston O-ring, 6. Large piston, 6a. Second ring groove, 6b. Conical surface, 7. Large piston O-ring, 8. Return spring, 9. Shift fork, 10. Differential lock signal switch, 10a. Contact, 11. Reducer housing, 11a. Second piston hole. Detailed Implementation

[0017] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, a hydraulic differential lock actuator arrangement structure for a drive axle consists of a differential lock cylinder body 1, a differential lock cylinder body fastening bolt 2, a hydraulic oil pipe connector 3, a small piston 4, a small piston O-ring 5, a large piston 6, a large piston O-ring 7, a return spring 8, a shift fork 9, a differential lock signal switch 10, and a reducer housing 11.

[0019] The differential lock cylinder body 1 is connected to the reducer housing 11 via differential lock cylinder body fastening bolts 2; a first threaded hole 1a and a second threaded hole 1b are provided on the differential lock cylinder body 1 for the installation of hydraulic oil pipe connector 3 and differential lock signal switch 10, respectively; an oil passage hole 1c and a first piston hole 1d are provided on the differential lock cylinder body 1, and the oil passage hole 1c and the first piston hole 1d are connected; a small piston 4 is installed at the position of the first piston hole 1d, and hydraulic oil applies pressure to the small piston 4 through the oil passage hole 1c to realize the axial movement of the small piston 4; a first ring groove 4a is provided on the small piston 4 for the installation of the small piston O-ring 5; the small piston O-ring 5 is installed together with the small piston 4 at the position of the first piston hole 1d on the differential lock cylinder body 1 for the sealing of hydraulic oil; a second piston hole 11a is provided on the reducer housing 11; a second ring groove 6a is provided on the large piston 6 for the installation of the large piston O-ring 7; the large piston 6 ... on the reducer housing 11 for the installation of the large piston O-ring 7; the large piston 6 is installed on the reducer housing 11 for the installation The piston O-ring 7 is installed together with the large piston 6 at the second piston hole 11a position on the reducer housing 11 for sealing the gear oil; the end face of the large piston 6 contacts the end face of the small piston 4, and when the small piston 4 moves axially, it pushes the large piston 6 to move together; the differential lock signal switch 10 is provided with an axially extendable contact 10a, which controls the opening and closing of the internal circuit and transmits corresponding signals by extending and closing the contact 10a; the large piston 6 is provided with a conical surface 6b, and when the large piston 6 moves axially, the conical surface 6b on the large piston 6 contacts the contact 10a on the differential lock signal switch 10, and the contact 10a is compressed, which realizes the extension and closing of the contact 10a on the differential lock signal switch 10; the shift fork 9 is mounted on the large piston 6, and the large piston 6 is provided with a shoulder for axial limiting of the shift fork 9; the return spring 8 is mounted on the piston 6, with one end in contact with the end face of the shift fork 9 and the other end in contact with the end face of the reducer housing 11.

[0020] This utility model discloses a hydraulic differential lock actuator arrangement structure for a drive axle. During operation, when hydraulic oil of a certain pressure is filled into the hydraulic oil pipe joint, the small piston pushes the large piston to move axially, which in turn pushes the shift fork to move axially, and finally compresses the return spring. At this time, the conical surface on the large piston will compress the contacts on the differential lock signal switch, and the differential lock signal switch will transmit the corresponding signal.

[0021] When the hydraulic oil in the hydraulic oil pipe joint is depressurized, the return spring will push the shift fork to move in the opposite direction along with the large piston and the small piston. At this time, the conical surface on the large piston will disengage from the contact on the differential lock signal switch, and the differential lock signal switch will transmit the corresponding signal.

[0022] The mating surfaces of the differential lock cylinder block and the reducer housing are not sealed. When the O-ring seal of the small piston or the large piston fails, it can be determined by the oil leakage at the mating surfaces.

[0023] This utility model discloses a hydraulic differential lock actuator arrangement structure for a drive axle. By adding a small piston, the hydraulic oil and gear oil are sealed and separated, improving reliability. When the O-ring seal fails, it can be identified by the oil leakage at the housing mating surface, allowing for early intervention and preventing damage to parts caused by the mixing of two different oils.

[0024] It should be understood that any technical features not described in detail in this specification belong to the prior art. Although the embodiments of this utility model patent have been described, this utility model is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make more forms under the guidance of this utility model without departing from the spirit and scope of protection of this utility model and the claims, and these all fall within the protection scope of this utility model.

Claims

1. A hydraulic differential lock actuator arrangement for a drive axle, characterized in that, It consists of a differential lock cylinder body, a hydraulic oil pipe connector, a small piston, a small piston O-ring, a large piston, a large piston O-ring, a return spring, a shift fork, a differential lock signal switch, and a reducer housing. The differential lock cylinder body is connected to the reducer housing. The differential lock cylinder body is equipped with a hydraulic oil pipe connector. A small piston is installed in the piston hole of the differential lock cylinder body. A small piston O-ring is installed in the annular groove of the small piston. A large piston is installed in the piston hole of the reducer housing. A large piston O-ring is installed in the annular groove of the large piston. The shift fork is mounted on the large piston. The return spring is mounted on the large piston, with one end of the return spring contacting the end face of the shift fork and the other end contacting the end face of the reducer housing. A differential lock signal switch is installed on the differential lock cylinder body.

2. The hydraulic differential lock actuator arrangement structure for a drive axle according to claim 1, characterized in that, The differential lock cylinder body is provided with an oil passage hole and a first piston hole, which are connected; the small piston is installed at the position of the first piston hole.

3. The hydraulic differential lock actuator arrangement structure for a drive axle according to claim 1, characterized in that, The small piston is provided with a first ring groove, and the small piston O-ring is installed in the first ring groove. The small piston O-ring is installed together with the small piston at the first piston hole position on the differential lock cylinder body.

4. The hydraulic differential lock actuator arrangement structure for a drive axle according to claim 1, characterized in that, The reducer housing is provided with a second piston hole.

5. The hydraulic differential lock actuator arrangement structure for a drive axle according to claim 1, characterized in that, The large piston is provided with a second annular groove, and the large piston O-ring is installed in the second annular groove. The large piston O-ring is installed together with the large piston at the second piston hole position on the reducer housing.

6. The hydraulic differential lock actuator arrangement structure for a drive axle according to claim 1, characterized in that, The end face of the large piston is in contact with the end face of the small piston.

7. The hydraulic differential lock actuator arrangement structure for a drive axle according to claim 1, characterized in that, The differential lock signal switch is equipped with axially retractable contacts.

8. The hydraulic differential lock actuator arrangement structure for a drive axle according to claim 1, characterized in that, The large piston has a conical surface. When the large piston moves axially, the conical surface on the large piston contacts the contact on the differential lock signal switch, and the contact is compressed.

9. The hydraulic differential lock actuator arrangement structure for a drive axle according to claim 1, characterized in that, The differential lock cylinder body is connected to the reducer housing via differential lock cylinder body fastening bolts.

10. The hydraulic differential lock actuator arrangement structure for a drive axle according to claim 1, characterized in that, The hydraulic oil pipe joint is connected to the differential lock cylinder body via threads.

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