Hydraulic drive inter-shaft differential lock structure assembly

Abstract

The utility model discloses a hydraulic drive inter-shaft differential lock structure assembly which is characterized by comprising a gap bridge box cover, a hydraulic cylinder, a sealing gasket, a shifting fork shaft, an O-shaped ring, a fastening bolt, an adjusting gasket, a shifting fork, a differential lock switch, a return spring and a reduction shell. Compared with a traditional structure, the hydraulic drive inter-axle differential lock structure meets the requirement of the development direction of the automobile industry; compared with a pneumatic structure, the driving force is stronger, and the differential locking function of the whole structure assembly is more reliable; the sealing gasket and the O-shaped ring are arranged, so that the sealing performance of the assembly is more excellent; an adjusting gasket is arranged between the shifting fork shaft and the shifting fork, so that the working limit positions of the shifting fork shaft and the shifting fork are more accurate, and the differential locking position is more accurate; the differential lock switch is arranged on the gap bridge box cover, and the matching mode of the switch and the shifting fork is set to be a structure of a ball head and a three-section contact surface, so that the reliability and the stability of electric signal transmission of the differential lock switch are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of axles of heavy-duty and mining trucks, and specifically relates to a hydraulic inter-axle differential lock structure assembly. Background Art

[0002] The mid-bridge main reducer of the drive axle of heavy-duty and mining trucks is equipped with an inter-axle differential lock structure for locking the inter-axle differential between the front and rear drive axles. Usually, when the vehicle is on a muddy road surface and one of the front and rear drive axles cannot obtain road adhesion, the inter-axle differential lock needs to be used.

[0003] For the traditional inter-axle differential lock structure on the mid-bridge main reducer of mining trucks and heavy-duty trucks, the driving force for pushing the shift fork shaft is pneumatic. However, due to the small air pressure, the shaft diameter of the piston rod part of the shift fork shaft needs to be large, resulting in material waste. In addition, in recent years, due to the overall design and matching requirements of the vehicle, more and more models only arrange hydraulic pressure and cancel pneumatic pressure during the overall layout, so that the pneumatic structure is coming to an end and will face a situation of being useless. Moreover, for the traditional inter-axle differential lock structure, sealing problems often occur, resulting in air leakage and air leakage failures from time to time. Thirdly, for the traditional inter-axle differential lock structure, due to the lack of adjustment gaskets for adjusting the axial position of the shift fork, the problem of inaccurate working limit position of the shift fork often occurs. Finally, the differential lock switch is used to transmit the signal for locking the lock. For the traditional inter-axle differential lock structure, the differential lock switch is mostly arranged on the differential lock cylinder rather than the cross-bridge cover, and the front-end sensing joint is mostly a pin structure. The problems of this structure are: first, if the switch arrangement position remains unchanged, arranging hydraulic braking will cause the hydraulic cylinder to be unable to be designed; second, there are always problems with poor contact accuracy of the pin structure sensing joint, resulting in unstable signal transmission. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the above-mentioned existing technologies, and to provide a hydraulic inter-axle differential lock structure assembly.

[0005] The technical solution provided by the present utility model is: a hydraulic inter-axle differential lock structure assembly, which is characterized in that it is composed of a cross-over box cover, a hydraulic cylinder, a fork shaft, an adjusting gasket, a fork, a differential lock switch, a return spring and a reduction housing; the cross-over box cover and the hydraulic cylinder are assembled and fixed together, and the assembly end faces of the cross-over box cover and the hydraulic cylinder are parallel to each other; the outer diameter of the front shaft section of the fork shaft is the same as the inner diameter of the piston hole on the hydraulic cylinder, and the two are assembled together; the shaft diameter of the end shaft section of the fork shaft is the same as the aperture of the fork shaft guiding hole of the reduction housing, and the two are assembled together; the fork shaft moves axially between the hydraulic cylinder and the reduction housing; an intermediate shaft section and a shaft shoulder are provided at the middle position of the fork shaft, and the shaft diameter of the intermediate shaft section is the same as the inner hole apertures of the adjusting gasket and the fork; the adjusting gasket is assembled with the fork shaft, the right end face of the adjusting gasket abuts against the shaft shoulder, the fork is assembled with the fork shaft, and the right end face of the fork abuts against the left end face of the adjusting gasket; the shaft diameter of the fork shaft is the same as the inner hole aperture of the return spring, the return spring is assembled on the fork shaft, the left end abuts against the inner end face of the reduction housing, and the right end abuts against the left end face of the fork; a differential lock switch is provided on the cross-over box cover; the hydraulic cylinder is provided with an oil inlet hole, and the oil inlet hole is communicated with the piston hole, realizing the entry of hydraulic oil.

[0006] Further, a sealing gasket is provided between the cross-over box cover and the hydraulic cylinder; an O-ring is provided at the groove section position of the fork shaft.

[0007] Further, the adjusting gasket is a series of parts with different thicknesses.

[0008] Further, the upper end face of the fork is a three-section structure of a flat section, an inclined section and a flat section. There is a 1-mm gap between the initial flat section position and the lower ball head of the differential lock switch. The inclined section contacts the ball head and continuously presses the ball head upward. At the end flat section position, the ball head of the differential lock switch reaches the limit pressing position, realizing the conduction of the internal circuit signal.

[0009] The beneficial effects of the present utility model are as follows: 1. The inter-axle differential lock structure is hydraulically driven, meeting the requirements of the development direction of the automotive industry. Compared with the pneumatic structure, the hydraulic structure has a stronger driving force, so that the overall differential lock function of the entire structure assembly is more reliable; 2. Due to the setting of the sealing gasket and the O-ring, compared with the transmission structure, the sealing performance of the entire assembly is significantly improved; 3. An adjusting gasket is provided between the fork shaft and the fork, making the working limit positions of the two more accurate, so that the differential lock position is more precise; 4. The differential lock switch is arranged on the cross-over box cover, and the cooperation mode between the switch and the fork is set as a structure of a ball head and a three-section contact surface, ensuring the reliability and stability of the electrical signal transmission of the differential lock switch. Description of the Drawings

[0010] Figure 1 is the structural schematic diagram of the present utility model;

[0011] Figure 2 It is a schematic structural view of the shift fork shaft of the present utility model. Specific embodiments

[0012] For better understanding and implementation, the present utility model will be described in detail below with reference to the accompanying drawings.

[0013] Such as Figure 1 、 2As shown in the figure, a hydraulic inter-axle differential lock structure assembly consists of a cross-over housing cover 1, a hydraulic cylinder 2, a gasket 3, a fork shaft 4, an O-ring 5, fastening bolts 6, adjusting shims 7, a fork 8, a differential lock switch 9, a return spring 10, and a reduction housing 11. A hydraulic cylinder assembly end face and an assembly hole are machined on the cross-over housing cover 1, and they are perpendicular to each other. An assembly end face and an assembly shaft diameter are machined on the hydraulic cylinder 2, and they are perpendicular to each other. An assembly hole is machined on the gasket 3. The assembly shaft diameter of the hydraulic cylinder 2 is the same as the inner diameter of the assembly hole of the cross-over housing cover 1 and the assembly hole of the gasket 3. The cross-over housing cover 1, the hydraulic cylinder 2, and the gasket 3 are assembled and fixed together by 3 fastening bolts 6. The assembly end faces of the cross-over housing cover 1 and the hydraulic cylinder 2 are parallel to each other, and the gasket 3 is located between them and abuts against them parallelly. A piston hole for the working fit of the fork shaft is machined on the hydraulic cylinder 2. The front end of the fork shaft 4 is machined with a front end shaft section 41 that works with the piston hole of the hydraulic cylinder. The outer diameter of the front end shaft section 41 is machined to be the same as the inner diameter of the piston hole of the hydraulic cylinder 2, and they are assembled together. The reduction housing 11 is machined with a fork shaft guide hole. The end of the fork shaft 4 is machined with an end shaft section 42. The shaft diameter of the end shaft section 42 is machined to be the same as the aperture of the fork shaft guide hole of the reduction housing 11, and they are assembled together. The fork shaft 4 can move axially between the hydraulic cylinder 2 and the reduction housing 11. A groove section 43 is machined on the fork shaft 4. The aperture and cross-sectional diameter of the O-ring 5 are respectively equal to the shaft diameter and groove width of the groove section 43. The outer diameter of the O-ring 5 is machined to be the same as the aperture of the hydraulic cylinder 2. The O-ring 5 is assembled and fixed at the groove section 43 of the fork shaft 4. An intermediate shaft section 44 is machined at the middle position of the fork shaft 4. The inner hole diameters of the adjusting shim 7 and the fork 8 are both the same as the shaft diameter of the intermediate shaft section 44. A shaft shoulder 45 is machined on the fork shaft 4. The adjusting shim 7 is assembled with the fork shaft 4, and the right end face of the adjusting shim 7 abuts against the shaft shoulder 45. The fork 8 is assembled with the fork shaft 4, and the right end face of the fork 8 abuts against the left end face of the adjusting shim 7. The inner hole diameter of the return spring 10 is the same as the shaft diameter of the fork shaft 4. The return spring 10 is assembled on the fork shaft 4, with the left end abutting against the inner end face of the reduction housing 11 and the right end abutting against the left end face of the fork 8. There is a differential lock switch assembly hole on the cross-over housing cover 1, and its aperture is the same as the shaft diameter of the differential lock switch 9. They are assembled and fixed together. There is an oil inlet hole on the hydraulic cylinder 2, and the oil inlet hole is connected to the piston hole to realize the introduction of hydraulic oil. In the presence of oil pressure, the fork shaft 4 will drive the fork 8 to move axially to the extreme left position. When the oil pressure is removed, the return spring 10 will push the fork 8 and the fork shaft 4 back to the initial position. Due to the presence of the gasket 3 and the O-ring 5, the reliable sealing of the assembly structure is ensured.

[0014] Furthermore, the adjustment gasket 7 is a series of parts with different thicknesses; the upper end surface of the fork 8 is processed into a three-section structure of a flat section, an inclined section, and a flat section. The initial flat section position leaves a 1mm gap with the lower ball head of the differential lock switch 9, the inclined section position contacts the ball head and continuously presses the ball head to move upward, and the terminal flat section position and the ball head of the differential lock switch 9 reach the extreme pressing position to realize the conduction of the internal circuit signal.

[0015] The utility model is a hydraulic inter-axle differential lock structure assembly. When working, the oil inlet hole of the hydraulic cylinder 2 is connected to the oil pipeline of the whole vehicle. After the oil enters the hole, when the oil pressure increases to above 3.5Mpa, the fork shaft 4 drives the fork 8 to move leftward under the pressure of the oil. The lower end of the fork 8 is equipped with a sliding meshing sleeve. At this time, the sliding meshing sleeve and the meshing teeth of the active cylindrical gear begin to mesh with each other. When the front end surface of the sliding meshing sleeve contacts the active cylindrical gear, this position is the limit position of the leftward movement of the fork 8. At this moment, the main reducer is The inter-axle differential is locked; at the same time, the upper end surface of the shift fork 8 and the ball head of the differential lock switch 9 start from a separated state, gradually contact and finally press the ball head to the limit state, so that the differential lock switch circuit is turned on to transmit an electrical signal to the vehicle cab; when the vehicle needs to remove the differential lock, the vehicle oil pressure is reduced, and the shift fork 8 and the shift fork shaft 4 move to the right to the initial position under the spring force of the return spring 10, the sliding engagement sleeve disengages from the active cylindrical wheel, the shift fork 8 disengages from the differential lock switch ball head, and the differential lock switch electrical signal is released.

[0016] It should be understood that the technical features not elaborated in detail in this specification belong to the prior art; although the implementation methods of the present application have been described, the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can make more forms under the inspiration of this application without departing from the scope of protection of the patent purpose and claims, which all belong to the scope of protection of this application.

Claims

1. A hydraulic inter-axle differential lock structure assembly, characterized in that: The invention comprises a bridge case cover (1), a hydraulic cylinder (2), a shift fork shaft (4), an adjustment gasket (7), a shift fork (8), a differential lock switch (9), a return spring (10) and a reduction housing (11); the bridge case cover (1) and the hydraulic cylinder (2) are assembled and fixed together, and the assembly end faces of the bridge case cover (1) and the hydraulic cylinder (2) are parallel to each other; the outer diameter of the front end shaft section (41) of the shift fork shaft (4) is the same as the inner diameter of the piston hole on the hydraulic cylinder (2), and the two are assembled together; the shaft diameter of the end shaft section (42) of the shift fork shaft (4) is the same as the hole diameter of the shift fork shaft guide hole of the reduction housing (11), and the two are assembled together; the shift fork shaft (4) moves axially between the hydraulic cylinder (2) and the reduction housing (11); an intermediate shaft section (44) and a shaft shoulder (45) are provided at the middle position of the shift fork shaft (4) The shaft diameter of the intermediate shaft section (44) is the same as the inner hole diameters of the adjusting gasket (7) and the shift fork (8); the adjusting gasket (7) is assembled with the shift fork shaft (4), the right end face of the adjusting gasket (7) abuts against the shaft shoulder (45); the shift fork (8) is assembled with the shift fork shaft (4), the right end face of the shift fork (8) abuts against the left end face of the adjusting gasket (7); the shaft diameter of the shift fork shaft (4) is the same as the inner hole diameter of the return spring (10); the return spring (10) is assembled on the shift fork shaft (4), the left end abuts against the inner end face of the reduction housing (11), and the right end abuts against the left end face of the shift fork (8); a differential lock switch (9) is provided on the bridge case cover (1); an oil inlet hole is provided on the hydraulic cylinder (2), the oil inlet hole is connected to the piston hole, and the hydraulic oil is allowed to enter.

2. The hydraulic inter-axle differential lock structure assembly according to claim 1, characterized in that: A sealing gasket (3) is provided between the bridge box cover (1) and the hydraulic cylinder (2); and an O-ring (5) is provided at the groove section (43) of the shift fork shaft (4).

3. The hydraulic inter-axle differential lock structure assembly according to claim 1, characterized in that: The adjusting gasket (7) is a series of pieces with different thicknesses.

4. The hydraulic inter-axle differential lock structure assembly according to claim 1, characterized in that: The upper end surface of the shift fork (8) is a three-section structure of a flat section, an inclined section, and a flat section. The initial flat section position leaves a gap of 1 mm with the lower end ball head of the differential lock switch (9). The inclined section position contacts the ball head and continuously presses the ball head to move upward. The terminal flat section position and the ball head of the differential lock switch (9) reach the extreme pressing position, thereby realizing the conduction of the internal circuit signal.

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