阅读说明：本技术 液压控制的限滑差速器 (Hydraulically controlled limited slip differential ) 是由 尹永伟 薛汉明 王新凤 于 2021-09-17 设计创作，主要内容包括：本发明公开了一种液压控制的限滑差速器,其属于工程机械技术领域。它主要包括差扭装置,差扭装置与驱动桥壳体连接,差扭装置包括油缸壳体,油缸壳体上设有油口A,所述驱动桥壳体上设有与油口A配合的油口B,油口A和油口B通过密封销密封连接。通过密封柱销与驱动桥壳体连接,油缸供油结构简单,安装维护性能好。本发明油缸壳体的油口A通过密封销与驱动桥壳体连接,装配及维护方便,同时增设防转动措施,消除因惯性和扭力造成零件转动带来的磨损和漏油等风险。本发明主要用于工程机械。(The invention discloses a hydraulically controlled limited slip differential, and belongs to the technical field of engineering machinery. The differential torsion device is connected with the driving axle housing and comprises an oil cylinder housing, an oil port A is arranged on the oil cylinder housing, an oil port B matched with the oil port A is arranged on the driving axle housing, and the oil port A and the oil port B are in sealing connection through a sealing pin. Through sealed pin and the drive axle housing body coupling, the hydro-cylinder fuel feeding simple structure, installation maintainability is good. The oil port A of the oil cylinder shell is connected with the drive axle shell through the seal pin, so that the oil cylinder shell is convenient to assemble and maintain, and meanwhile, anti-rotation measures are added, so that the risks of abrasion, oil leakage and the like caused by part rotation due to inertia and torsion are eliminated. The invention is mainly used for engineering machinery.)

1. The utility model provides a limited slip differential of hydraulic control, includes that the difference turns round device (2), and the difference turns round device (2) and is connected with transaxle casing (4), and the difference turns round device (2) including cylinder housing (212), is equipped with hydraulic fluid port A (214) on cylinder housing (212), its characterized in that: and an oil port B (401) matched with the oil port A (214) is arranged on the drive axle shell (4), and the oil port A (214) and the oil port B (401) are hermetically connected through a sealing pin (402).

2. The hydraulically controlled limited slip differential according to claim 1, wherein: the positioning device (215) which is convenient for the oil port A (214) and the oil port B (401) to correspond is arranged on the oil cylinder shell (212), the positioning device (215) is fixedly connected with the oil cylinder shell (212), and the positioning device (215) is fixedly connected with the drive axle shell (4) through a fastener.

3. The hydraulically controlled limited slip differential according to claim 2, wherein: the differential torsion device (2) is connected with the differential (1), the differential (1) comprises a differential shell (101), a side gear (102) is arranged in the differential shell (101), the differential torsion device (2) comprises a differential torsion shell (201), the differential torsion shell (201) is connected with the differential shell (101), a friction plate set (202) is arranged between the differential shell (101) and the side gear (102), a driving friction plate of the friction plate set (202) is connected with the side gear (102), a driven friction plate of the friction plate set (202) is connected with the differential torsion shell (201), a half shaft connected with the side gear (102) is arranged in the differential torsion shell (201), a sleeve (207) is sleeved on the half shaft, one end of the sleeve (207) is provided with a pressure plate (205) matched with the friction plate set (202), the other end of the sleeve (207) is provided with an oil cylinder piston (211) through a thrust bearing (213), and the outer end face of the oil cylinder piston (211) is matched with an oil port A (214).

4. The hydraulically controlled limited slip differential according to claim 3, wherein: the sleeve (207) outside is equipped with return spring (208), and return spring (208) one end is connected with poor torsional housing (201), and the boss cooperation on return spring (208) other end and sleeve (207).

5. The hydraulically controlled limited slip differential according to claim 4, wherein: the oil cylinder piston (211) is provided with more than two limiting pins (210), a first gap is formed between every two adjacent limiting pins (210), the oil cylinder shell (212) is provided with a clamping bolt (209), and the clamping bolt (209) penetrates through the first gap.

6. The hydraulically controlled limited slip differential according to claim 5, wherein: and a limiting mechanism (206) is arranged on the sleeve (207), and the sleeve (207) is connected with the pressure plate (205) through the limiting mechanism (206).

7. The hydraulically controlled limited slip differential according to claim 6, wherein: the limiting mechanism (206) is a spline, and the sleeve (207) is connected with the pressure plate (205) through the spline.

8. The hydraulically controlled limited slip differential according to claim 6, wherein: the limiting mechanism (206) is a pin, one end of the pin is embedded into the pressing plate (205), and the other end of the pin is embedded into the sleeve (207).

9. The hydraulically controlled limited slip differential according to claim 6, wherein: a second gap (216) is arranged between the friction plate group (202) and the differential torsion shell (201), and oil passages (217) are respectively arranged on two sides of the second gap (216).

10. The hydraulically controlled limited slip differential according to any one of claims 3-9, wherein: be equipped with wear indication mechanism (3) on transaxle casing (4), wear indication mechanism (3) are including slider (301) and sliding pin (303), be equipped with on slider (301) with sliding pin (303) complex slip table (302), be equipped with on sliding pin (303) location platform (304) and resilient means (305), slider (301) run through there are two at least fixed pins (306), the one end that fixed pin (306) are close to friction disc group (202) is equipped with resilient means two (307), slider (301) and hydro-cylinder piston (211) cooperation.

Technical Field

The invention belongs to the technical field of engineering machinery, and particularly relates to a hydraulically-controlled limited slip differential.

Background

In order to ensure good movement performance of the engineering machinery when the vehicle turns, a differential needs to be installed, but the torques of tires on two sides of the vehicle are the same, and the adhesion force of the ground cannot be fully utilized. Therefore, in order to improve the power performance of the engineering machinery vehicle, a limited slip differential or a differential lock is required. At present, a common limited slip differential is a limited slip differential with a friction plate clutch structure, namely, a cylinder piston is pushed by hydraulic pressure to compress a friction plate, so that differential speed is limited, and the power performance of a vehicle is improved.

The friction plate sets of the existing limited slip differential have basically the same structure, the oil cylinder structures are different, and the process and the service performance are also different. As shown in the utility model CN208734834U, the brake housing and the piston are oil cylinder assemblies, hydraulic oil is injected through an oil port on the brake housing to make the piston generate thrust, the piston pushes the thrust bearing, the thrust sleeve and the thrust execution lever to act on the brake pad and the friction pad, and the friction torque between the friction pads can limit or prevent differential speed, thereby achieving the effect of limited slip or differential lock. However, in this structure, an external oil port needs to be added to external parts such as an axle housing for oil supply of the oil cylinder, and the external oil port is connected with the oil port of the oil cylinder housing by means of casting, machining, assembling and the like. If the designed position and structure of the oil cylinder are not good, an oil port on the oil cylinder shell is difficult to be communicated with an oil port outside the axle housing. An oil port on the brake housing is located inside the axle housing, and the oil port is connected to the outside by a special structure, so that the structure of the limited slip differential is complex.

Secondly, when the friction plate is worn to a limit value, the friction plate is continuously used, unexpected faults can be caused, the friction plate is positioned in the differential mechanism, the wear condition cannot be predicted and measured outside, the existing differential mechanism is not provided with a friction plate wear indicating mechanism, the differential mechanism needs to be largely disassembled for inspection, and time and labor are wasted; meanwhile, no anti-rotation measure exists between the oil cylinder piston and the part for transmitting thrust, and the relative rotation between the oil cylinder piston and the part can generate faults of abrasion, oil leakage and the like.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the hydraulic control limited slip differential is provided, the oil port A of the oil cylinder shell is connected with the drive axle shell through the seal pin, the assembly and the maintenance are convenient, meanwhile, the anti-rotation measure is added, and the risks of abrasion, oil leakage and the like caused by part rotation due to inertia and torsion are eliminated.

The hydraulically controlled limited slip differential comprises a differential torque device, the differential torque device is connected with a drive axle housing, the differential torque device comprises an oil cylinder housing, an oil port A is arranged on the oil cylinder housing, an oil port B matched with the oil port A is arranged on the drive axle housing, and the oil port A and the oil port B are in sealing connection through a sealing pin. Through sealed pin and the drive axle housing body coupling, the hydro-cylinder fuel feeding simple structure, installation maintainability is good.

Preferably, the cylinder housing is provided with a positioning device convenient for the oil port A and the oil port B to correspond, the positioning device is fixedly connected with the cylinder housing, and the positioning device is fixedly connected with the drive axle housing through a fastener. The positioning device and the oil cylinder shell are integrally designed, so that the installation is convenient, and the oil port A and the oil port B are automatically aligned after the oil cylinder shell and the drive axle shell are installed.

Preferably, the differential torque device is connected with a differential, the differential comprises a differential shell, a half axle gear is arranged in the differential shell, the differential torque device comprises a differential torque shell, the differential torque shell is connected with the differential shell, a friction plate set is arranged between the differential shell and the half axle gear, a driving friction plate of the friction plate set is connected with the half axle gear, a driven friction plate of the friction plate set is connected with the differential torque shell, a half axle connected with the half axle gear is arranged in the differential torque shell, a sleeve is sleeved on the half axle, one end of the sleeve is provided with a pressure plate matched with the friction plate set, the other end of the sleeve is provided with an oil cylinder piston through a thrust bearing, and the outer end face of the oil cylinder piston is matched with the oil port A.

Preferably, the sleeve outside is equipped with return spring, and return spring one end is connected with the differential torsion casing, and the return spring other end cooperates with the boss on the sleeve. The return spring can make the pressure plate and the oil cylinder piston automatically return, and the friction loss of the friction plate set is reduced.

Preferably, the oil cylinder piston is provided with more than two limit pins, a first gap is formed between every two adjacent limit pins, and the oil cylinder shell is provided with a clamping bolt which penetrates through the first gap.

Preferably, a limiting mechanism is arranged on the sleeve, and the sleeve is connected with the pressure plate through the limiting mechanism.

Preferably, the limiting mechanism is a spline, and the sleeve is connected with the pressure plate through the spline.

Preferably, the limiting mechanism is a pin, one end of the pin is embedded into the pressure plate, and the other end of the pin is embedded into the sleeve.

Preferably, a second gap is formed between the friction plate set and the differential torsion shell, and oil passages are respectively arranged on two sides of the second gap.

Preferably, be equipped with wear indication mechanism on the transaxle casing, wear indication mechanism includes slider and sliding pin, is equipped with on the slider with sliding pin complex slip table, be equipped with location platform and resilient means one on the sliding pin, the slider runs through there are two at least fixed pins, the one end that the fixed pin is close to the friction disc group is equipped with resilient means two, slider and hydro-cylinder piston cooperation.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the oil port B corresponding to the oil port A of the oil cylinder shell is additionally arranged on the drive axle shell and is in sealing connection through the sealing pin, so that the installation mode that a connecting pipe is additionally arranged to communicate with the oil port in the prior art is avoided, and the oil supply structure of the oil cylinder is simplified; meanwhile, the positioning device is additionally arranged on the oil cylinder shell, the connection with the drive axle shell through the positioning device is more convenient, the installation and maintenance performance of the limited slip differential is improved, and the cost is low;

2. the oil cylinder piston is additionally provided with a limit pin and a clamping bolt, so that the oil cylinder piston can only move axially and cannot rotate around the central shaft of the oil cylinder shell; a limiting mechanism is additionally arranged between the pressure plate and the sleeve, and the pressure plate and the sleeve are prevented from rotating due to inertia and torsion transmitted by a thrust bearing through the limiting mechanism; through the anti-rotation measures, the risks of abrasion, oil leakage and the like caused by rotation of parts due to inertia and torsion are eliminated;

3. the wear indicating mechanism is additionally arranged, when the wear of the friction plate reaches a specified value, the wear indicating mechanism can automatically give an alarm through an electronic or mechanical indicator, and the wear indicating mechanism is more convenient to use;

4. a second gap is additionally arranged between the friction plate set and the differential torsion shell, and oil ducts are designed on two sides of the second gap, so that lubricating oil can more easily enter the friction plate set, and abrasive dust of the friction plates can be conveniently discharged.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the connection of the transaxle housing and the cylinder housing;

FIG. 3 is a schematic structural view of a wear indication mechanism;

FIG. 4 is a reference view of a wear indication mechanism in use;

FIG. 5 is a schematic diagram of the structure of the second clearance and the oil passage.

In the figure, 1, a differential; 101. a differential housing; 102. a half shaft gear; 2. a differential torsion device; 201. a differential torsion housing; 202. a friction plate set; 203. a retainer ring; 204. a first pin shaft; 205. a platen; 206. a limiting mechanism; 207. a sleeve; 208. a return spring; 209. a clamping bolt; 210. a spacing pin; 211. a cylinder piston; 212. a cylinder housing; 213. a thrust bearing; 214. an oil port A; 215. a positioning device; 216. a second gap; 217. an oil passage; 3. a wear indication mechanism; 301. a slider; 302. a sliding table; 303. a slide pin; 304. a positioning table; 305. a first elastic device; 306. a fixing pin; 307. a second elastic device; 308. a compression nut; 4. a transaxle housing.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

the first embodiment is as follows: as shown in fig. 1, the hydraulically controlled limited slip differential includes a differential torque device 2, the differential torque device 2 is connected with a drive axle housing 4, the differential torque device 2 includes a cylinder housing 212, an oil port a214 is arranged on the cylinder housing 212, an oil port B401 matched with the oil port a214 is arranged on the drive axle housing 4, and the oil port a214 and the oil port B401 are hermetically connected through a seal pin 402. In the embodiment, the oil port B401 corresponding to the oil outlet a214 is directly machined at the bottom of the drive axle housing 4, and the oil port a214 and the oil port B401 are hermetically connected together through the seal pin 402, so that the oil supply structure of the oil cylinder is greatly simplified, and the installation is convenient. Seal pin 402 is removable from the exterior of transaxle housing 4 for easy inspection and replacement.

Example two: as shown in fig. 2, a positioning device 215 corresponding to the oil port a214 and the oil port B401 is disposed on the cylinder housing 212, the positioning device 215 is fixedly connected to the cylinder housing 212, and the positioning device 215 is fixedly connected to the transaxle housing 4 through a fastener; the rest is the same as the first embodiment. In this embodiment, the positioning device 215 is a bearing seat, the bearing seat is welded with the cylinder housing 212 as a whole, the bearing seat is fixed to the drive axle housing 4 by bolts, and the setting position of the bearing seat facilitates the alignment of the oil port a214 and the oil port B401, so that the oil supply structure of the cylinder is convenient to maintain. Meanwhile, in the aspect of realizing the universality of the selective assembly of the limited slip differential and the common differential, the cylinder shell 212 can be replaced by the common bearing seat, so that the material is saved, and the production cost is reduced.

Example three: as shown in fig. 1, a differential device 2 is connected with a differential 1, the differential 1 includes a differential case 101, a side gear 102 is disposed in the differential case 101, the differential device 2 includes a differential case 201, the differential case 201 is connected with the differential case 101 through a bolt, a friction plate set 202 is disposed between the differential case 101 and the side gear 102, a driving friction plate of the friction plate set 202 is connected with the side gear 102, a driven friction plate of the friction plate set 202 is connected with the differential case 201 through a first pin 204 or a bolt, a half shaft connected with the side gear 102 is disposed in the differential case 201, a sleeve 207 is sleeved on the half shaft, one end of the sleeve 207 is provided with a pressure plate 205 matched with the friction plate set 202, a retainer 203 is disposed on the sleeve 207, the other end of the sleeve 207 is provided with an oil cylinder piston 211 through a thrust bearing 213, and an outer end surface of the oil cylinder piston 211 is matched with an oil port a 214.

A return spring 208 is arranged outside the sleeve 207, one end of the return spring 208 is connected with the differential torsion shell 201, and the other end of the return spring 208 is matched with a boss on the sleeve 207.

The oil cylinder piston 211 is provided with more than two limit pins 210, a first gap is formed between every two adjacent limit pins 210, the oil cylinder shell 212 is provided with a clamping bolt 209, and the clamping bolt 209 penetrates through the first gap.

The sleeve 207 is provided with a limiting mechanism 206, and the sleeve 207 is connected with the pressure plate 205 through the limiting mechanism 206.

The limiting mechanism 206 is a spline, and the sleeve 207 is connected with the pressure plate 205 through the spline. The limiting mechanism 206 prevents the sleeve 207 and the pressure plate 205 from rotating relative to each other.

As shown in fig. 5, a second gap 216 is provided between the friction plate set 202 and the differential housing 201, and oil passages 217 are provided on two sides of the second gap 216. This configuration allows the lubricant to enter the cavity where the friction plate set 202 is located more easily, which is beneficial to heat dissipation of the friction plates and facilitates the discharge of the wear debris of the friction plates.

The drive axle shell 4 is provided with a wear indication mechanism 3, the wear indication mechanism 3 comprises a sliding block 301 and a sliding pin 303, the sliding block 301 is provided with a sliding table 302 matched with the sliding pin 303, the sliding pin 303 is provided with a positioning table 304 and an elastic device I305, the sliding block 301 penetrates through at least two fixing pins 306, one end of each fixing pin 306 close to the corresponding friction plate group 202 is provided with an elastic device II 307, and the sliding block 301 is matched with the oil cylinder piston 211; the other steps are the same as those of the embodiment.

As shown in fig. 3 and 4, when the wear indication mechanism 3 is installed, one end of the fixed pin 306 close to the friction plate set 202 is connected with the drive axle housing 4, the other end of the fixed pin 306 is connected with the cylinder housing 212, the slider 301 can slide on the fixed pin 306, the bottom of the sliding pin 303 abuts against the sliding table 302 of the slider 301, the top of the sliding pin 303 is pressed by the pressing nut 308, the upper end of the first elastic device 305 abuts against the pressing nut 308, and the pressing nut 308 is connected with the electronic or mechanical indicator.

Example four: the limiting mechanism 206 is a pin, one end of the pin is embedded in the pressure plate 205, and the other end of the pin is embedded in the sleeve 207; the other steps are the same as those of the embodiment. The pressure plate 205 is connected to the differential housing 7 by pins, which prevent rotation of the pressure plate 205 and sleeve 207 due to inertia and torque transmitted by the thrust bearing 213.

When the differential mechanism is used, as shown in fig. 1, hydraulic oil enters an oil chamber of an oil cylinder through an oil port B401, a seal pin 402 and an oil port a214 and ensures a certain pressure to push an oil cylinder piston 211 to move leftwards, the oil cylinder piston 211 pushes a thrust bearing 213 and a sleeve 207, the oil cylinder pressure is finally applied to a pressure plate 205, the pressure plate 205 compresses a friction plate set 202, driven friction plates in the friction plate set 202 are connected with a differential case 201 through pins 204, and driving friction plates in the friction plate set 202 are connected with a half-axle gear 102, so that the half-axle gear 102 and the differential case 201 need to move relatively (i.e. generate differential speed), and the friction resistance between the friction plates needs to be overcome, thereby achieving the purpose of limiting the differential speed and improving the power. When the hydraulic oil pressure in the oil cylinder is removed, the sleeve 207, the thrust bearing 213 and the oil cylinder piston 211 return under the action of the return spring 208, the retainer ring 203 is arranged on the sleeve 207, and when the sleeve 207 returns, the retainer ring 203 drives the pressure plate 205 to return, so that sufficient clearance exists between the friction plates, and ineffective friction is reduced.

As shown in fig. 4, when the friction plate set 202 is worn by a certain amount, the cylinder piston 211 starts to push the slider 301 to move leftward, and when the moving amount exceeds the contact length between the sliding pin 303 and the slider 301, the sliding pin 303 falls under the action of the second elastic device 307, and triggers an indicator connected with the sliding pin 303 to send out a warning signal for replacing the friction plate. After the friction plate is replaced, the sliding pin 303 is lifted up, and the sliding block 301 returns under the action of the two left elastic devices 307. The structure can accurately remind the friction plate of reaching the abrasion limit, and avoids the fault caused by excessive abrasion.

As shown in fig. 1, two limit pins 210 are installed on the cylinder piston 211, the position-locking bolt 209 passes through a gap between the two limit pins 210, and the position-locking bolt 209 is fixed on the cylinder housing 212, so that the cylinder piston 211 can only move axially and cannot rotate around the central axis of the cylinder housing 212, and the structure can reduce the risk of oil leakage of the cylinder.