阅读说明：本技术 一种驱动桥的扭矩输入结构及贯通驱动桥 (Torque input structure of drive axle and through drive axle ) 是由 冯涛 史成淼 黄超 于 2021-08-30 设计创作，主要内容包括：本发明属于汽车零部件技术领域,一方面公开了一种驱动桥的扭矩输入结构,其包括第一连接部、第二连接部及摩擦材料,第一连接部能够连接于外部的传动轴,以能够为驱动桥输入扭矩,第一连接部上设置有第一摩擦面,第二连接部连接于驱动桥的输入轴,并能够与输入轴一同转动,摩擦材料被抵压于第一摩擦面及第二连接部之间,摩擦材料能够与第二连接部一同转动,并能够将其与第一连接部摩擦产生的扭矩传递至第二连接部,并且当第一连接部的扭矩大于预设扭矩时,第一连接部与第二连接部相对转动。本发明另一方面公开了一种包括如上的驱动桥的扭矩输入结构的贯通驱动桥。本发明有效地避免了车辆在载重状态下发生故障,保证了车辆行程过程中的安全性。(The invention belongs to the technical field of automobile parts, and discloses a torque input structure of a drive axle on one hand, which comprises a first connecting part, a second connecting part and a friction material, wherein the first connecting part can be connected with an external transmission shaft to input torque for the drive axle, a first friction surface is arranged on the first connecting part, the second connecting part is connected with an input shaft of the drive axle and can rotate together with the input shaft, the friction material is pressed between the first friction surface and the second connecting part, the friction material can rotate together with the second connecting part and can transmit the torque generated by friction between the friction material and the first connecting part to the second connecting part, and when the torque of the first connecting part is greater than the preset torque, the first connecting part and the second connecting part rotate relatively. The invention discloses a through drive axle of a torque input structure comprising the drive axle. The invention effectively avoids the vehicle from generating faults under the load state and ensures the safety of the vehicle in the process of travel.)

1. A torque input structure of a drive axle, connected to an input shaft (3) of the drive axle, characterized by comprising:

a first connecting portion (21) which can be connected to an external transmission shaft so as to input torque to the drive axle, wherein a first friction surface is arranged on the first connecting portion (21);

a second connecting portion (22) connected to the input shaft (3) and rotatable together with the input shaft (3); and

the friction material is pressed between the first friction surface and the second connecting portion (22) in a pressed mode, the friction material can rotate together with the second connecting portion (22), torque generated by friction between the friction material and the first connecting portion (21) can be transmitted to the second connecting portion (22), and when the torque of the first connecting portion (21) is larger than preset torque, the first connecting portion (21) and the second connecting portion (22) rotate relatively.

2. The torque input structure of the transaxle according to claim 1, wherein:

the first connection portion (21) comprises a first connection shaft (211), the first connection shaft (211) being connectable to the transmission shaft, the first friction surface being provided on the first connection shaft (211) and the friction material being provided on the first friction surface;

the second connecting portion (22) comprises a shaft sleeve (221) and a second friction surface, the shaft sleeve (221) is provided with a first through hole for the first connecting shaft (211) to pass through, the second friction surface is arranged on the shaft sleeve (221), the second friction surface is provided with the friction material, and the first friction surface is abutted to the second friction surface.

3. The torque input structure of a drive axle according to claim 2, wherein the first friction surface comprises an outer side surface of the first connecting shaft (211), the second friction surface comprises an inner side surface of the bushing (221) located at the first through hole, and the outer side surface of the first connecting shaft (211) abuts against the inner side surface of the bushing (221) located at the first through hole.

4. The torque input structure of a drive axle according to claim 3, wherein the outer side surface of the first connecting shaft (211) and the inner side surface of the bushing (221) located at the first through hole are tapered surfaces.

5. The torque input structure of the transaxle according to claim 4, wherein:

the inner side surface of the shaft sleeve (221) positioned at the first through hole comprises a first taper and a second taper, the directions of the first taper and the second taper are opposite, the inner diameter of the first through hole is gradually reduced from two ends to the middle section, and the outer side surface of the first connecting shaft (211) is abutted to the inner side surface of the shaft sleeve (221) with the first taper positioned at the first through hole;

the first connecting portion (21) further comprises a second connecting shaft (212), the second connecting shaft (212) is connected to the first connecting shaft (211) in a synchronous rotating mode, the first friction surface further comprises an outer side face of the second connecting shaft (212), and the outer side face of the second connecting shaft (212) is abutted to the inner side face of the first through hole, wherein the shaft sleeve (221) is of the second taper.

6. The torque input structure of a drive axle according to claim 5, wherein a spline groove (2111) is provided in the first connecting shaft (211), the spline groove (2111) extends in an axial direction of the first connecting shaft (211), and a spline (2121) capable of being inserted into the spline groove (2111) is provided in the second connecting shaft (212).

7. The torque input structure of the transaxle according to claim 1, wherein:

the first connection portion (21) comprises a first connection shaft (211), the first connection shaft (211) being connectable to the transmission shaft, the first friction surface being provided on the first connection shaft (211) and the friction material being provided on the first friction surface;

the second connecting portion (22) comprises a shaft sleeve (221), the shaft sleeve (221) is provided with a first through hole through which the first connecting shaft (211) penetrates, the first connecting shaft (211) is rotatably arranged in the first through hole, the torque input structure of the drive axle further comprises a friction block (23), the friction block (23) is made of a friction material, and the friction block (23) is detachably arranged on the shaft sleeve (221).

8. The torque input structure of a drive axle according to claim 7, wherein a second through hole capable of extending into the first through hole is provided on an outer side surface of the bushing (221), and the friction block (23) extends into the second through hole and abuts against the first connecting shaft (211) located in the first through hole.

9. A through-drive axle comprising a torque input structure of a drive axle according to any one of claims 1 to 8.

10. A through-drive axle according to claim 9, characterized in that it further comprises a housing (1) and a sealing structure (4), the housing (1) being provided with a mounting hole for a torque input structure of the axle to be connected with the driveshaft, the sealing structure (4) being configured to seal the mounting hole.

Technical Field

The invention relates to the field of automobile parts, in particular to a torque input structure of a drive axle and a through drive axle.

Background

The drive axle is generally divided into a drive axle, a steering axle, a tag axle and a steer-drive axle. The drive axle is located at the end of the vehicle drive train and is capable of changing the rotational speed and torque from the transmission and transmitting them to the drive wheels, thereby driving the vehicle in motion.

However, when the load of the vehicle is large, the torque input to the drive axle may be large, and the input torque may exceed the rated torque of the drive axle.

Therefore, there is a need to solve the above problems.

Disclosure of Invention

The invention aims to provide a torque input structure of a drive axle and a through drive axle, which solve the problem that when the input torque exceeds the rated torque of the drive axle, the service life of parts such as gears, bearings and the like in the drive axle is shortened.

To achieve the object, an aspect of the present invention provides a torque input structure of a transaxle, which is connected to an input shaft of the transaxle, the torque input structure of the transaxle including:

the first connecting part can be connected to an external transmission shaft so as to input torque to the drive axle, and a first friction surface is arranged on the first connecting part;

a second connecting portion connected to the input shaft and rotatable together with the input shaft; and

the friction material is pressed between the first friction surface and the second connecting portion, can rotate together with the second connecting portion, can transmit torque generated by friction between the friction material and the first connecting portion to the second connecting portion, and can rotate relative to the second connecting portion when the torque of the first connecting portion is larger than a preset torque.

Preferably, the first connecting portion includes a first connecting shaft connectable to the transmission shaft, the first friction surface is provided on the first connecting shaft, and the friction material is provided on the first friction surface;

the second connecting portion comprises a shaft sleeve and a second friction surface, the shaft sleeve is provided with a first through hole for the first connecting shaft to pass through, the second friction surface is arranged on the shaft sleeve and provided with the friction material, and the first friction surface is abutted to the second friction surface.

Preferably, the first friction surface includes an outer surface of the first connecting shaft, the second friction surface includes an inner surface of the bushing located in the first through hole, and the outer surface of the first connecting shaft abuts against the inner surface of the bushing located in the first through hole.

Preferably, the outer side surface of the first connecting shaft and the inner side surface of the shaft sleeve located in the first through hole are both conical surfaces.

Preferably, the inner side surface of the shaft sleeve located in the first through hole includes a first taper and a second taper, the first taper and the second taper are opposite in direction, the inner diameter of the first through hole gradually decreases from two ends to a middle section, and the outer side surface of the first connecting shaft abuts against the inner side surface of the shaft sleeve located in the first through hole and having the first taper;

the first connecting portion further comprises a second connecting shaft, the second connecting shaft is connected to the first connecting shaft in a synchronous rotating mode, the first friction surface further comprises an outer side face of the second connecting shaft, and the outer side face of the second connecting shaft is abutted to the inner side face of the first through hole, wherein the shaft sleeve is of the second taper.

Preferably, the first connecting shaft is provided with a spline groove, the spline groove extends along the axial direction of the first connecting shaft, and the second connecting shaft is provided with a spline which can be inserted into the spline groove.

Preferably, the first connecting portion includes a first connecting shaft connectable to the transmission shaft, the first friction surface is provided on the first connecting shaft, and the friction material is provided on the first friction surface;

the second connecting portion include the axle sleeve, the axle sleeve is provided with and is used for first connecting axle passes first through-hole, first connecting axle rotationally set up in the first through-hole, the moment of torsion input structure of transaxle still includes the clutch blocks, the clutch blocks by friction material makes, the clutch blocks can dismantle set up in on the axle sleeve.

Preferably, a second through hole capable of extending into the first through hole is formed in the outer side face of the shaft sleeve, and the friction block extends into the second through hole and abuts against the first connecting shaft located in the first through hole.

Another aspect of the present invention provides a through drive axle including a torque input structure of the drive axle as described above.

Preferably, the through drive axle further includes a housing provided with a mounting hole for connecting the torque input structure of the drive axle with the driveshaft, and a sealing structure configured to seal the torque input structure of the drive axle with the mounting hole.

The invention has the beneficial effects that: through connecting in the friction of the first connecting portion and friction material of outside transmission shaft, make friction material can transmit its moment of torsion that produces with the friction of first connecting portion for the second connecting portion, and according to the friction characteristic, when the moment of torsion of first connecting portion is greater than predetermineeing the moment of torsion, friction material can take place relative rotation with first connecting portion, and can make the moment of torsion of second connecting portion be not more than predetermineeing the moment of torsion, thereby can avoid the load of input transaxle too big, and then guaranteed the transaxle inner bearing, the life of parts such as gear, effectively avoided the vehicle to break down under the load state, the security of vehicle stroke in-process has been guaranteed.

Drawings

Fig. 1 is a schematic structural diagram of an input end of a drive axle according to an embodiment of the present invention;

FIG. 2 is a partial view at R of FIG. 1;

FIG. 3 is a schematic structural diagram of a torque input configuration of the transaxle of FIG. 1;

FIG. 4 is a schematic view of the construction of the sleeve of FIG. 3;

FIG. 5 is a schematic view of the first connection portion in FIG. 3;

FIG. 6 is a schematic structural diagram of a torque input structure of a transaxle according to a second embodiment of the present invention;

fig. 7 is a schematic structural diagram of a torque input structure of a transaxle according to a third embodiment of the present invention.

In the figure:

1. a housing;

2. a torque input structure of the drive axle; 21. a first connection portion; 211. a first connecting shaft; 2111. a spline groove; 2112. a first outer conical surface; 212. a second connecting shaft; 2121. a spline; 2122. a second outer conical surface; 213. fastening a bolt; 214. a nut; 215. a flange plate; 22. a second connecting portion; 221. a shaft sleeve; 2211. a first inner conical surface; 2212. a second inner conical surface; 2213. a pin hole; 222. a pin; 23. a friction block; 24. a second bearing; 25. a gasket;

3. an input shaft;

4. a sealing structure; 41. an adjustment ring; 42. an O-shaped ring; 43. oil sealing; 44. a dust cover;

51. a first bearing.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

The present embodiment provides a through-drive axle, which includes an input shaft 3 connected to an external propeller shaft, as shown in fig. 1, the input shaft 3 being capable of transmitting the torque of the propeller shaft to left and right half shafts, thereby driving wheels to rotate and transmitting the torque to another drive axle. However, when the load of the vehicle is large, the torque of the propeller shaft may be large, so that the torque input to the through drive axle may be large, and the torque input to the through drive axle may exceed the rated torque of the through drive axle.

In order to solve the above problem, as shown in fig. 1 to 5, the present embodiment provides a torque input structure 2 of a transaxle, wherein the torque input structure 2 of the transaxle is disposed at an input end of the transaxle and is defined at the input end of the transaxle by a first bearing 51. The torque input structure 2 of the drive axle comprises a first connecting part 21, a second connecting part 22 and friction materials, wherein the first connecting part 21 can be connected with an external transmission shaft so as to input torque for penetrating through the drive axle, a first friction surface is arranged on the first connecting part 21, at least two pin holes 2213 are arranged on the second connecting part 22, at least two pins 222 are arranged on the input shaft 3, the second connecting part 22 is matched with the pin holes 2213 through the pins 222 so that the second connecting part 22 is connected with the input shaft 3 and can rotate together with the input shaft 3, the friction materials are pressed between the first friction surface and the second connecting part 22, the friction materials can rotate together with the second connecting part 22 and can transmit the torque generated by friction with the first connecting part 21 to the second connecting part 22, and when the torque of the first connecting part 21 is larger than a preset torque, the first connecting part 21 and the second connecting part 22 rotate relatively, the preset torque can enable the load borne by gears, bearings or other parts in the through drive axle to be smaller than respective rated load, and the dynamic friction force generated in the relative rotation process of the first connecting part 21 and the second connecting part 22 is not larger than the static friction force generated by the relative rest of the first connecting part 21 and the second connecting part 22, so that the torque input to the input shaft 3 of the through drive axle is not larger than the preset torque, the excessive load input to the through drive axle can be avoided, the service lives of the parts such as the bearings and the gears in the through drive axle are further ensured, the faults of the vehicle in a load state are effectively avoided, and the safety in the vehicle stroke process is ensured.

Further, since the magnitude of the friction force is related to the contact area and the friction coefficient of the friction material, in order to avoid the wear of the first connection portion 21 and the friction material while satisfying the requirement that the torque generated by the friction force can reach the preset torque, in the embodiment, the second connection portion 22 includes the shaft sleeve 221 and the second friction surface, the first connection portion 21 includes the first connection shaft 211, the shaft sleeve 221 is provided with a first through hole for the first connection shaft 211 to pass through, the second friction surface is disposed on the shaft sleeve 221, and the second friction surface is provided with the friction material, the first connection shaft 211 can be connected to the transmission shaft, the first friction surface is disposed on the first connection shaft 211, and the friction material is disposed on the first friction surface, and the first friction surface abuts against the second friction surface, so that the contact area between the first friction surface and the second friction surface is large, and the wear between the friction material and the first connection shaft 211 can be effectively reduced, and the selection range of the friction material is wider, and the cost is lower.

Specifically, in this embodiment, the first friction surface includes an outer side surface of the first connecting shaft 211, the second friction surface includes an inner side surface of the bushing 221 located in the first through hole, the outer side surface of the first connecting shaft 211 is a first outer tapered surface 2112, the inner side surface of the bushing 221 located in the first through hole is a first inner tapered surface 2211, the first connecting shaft 211 is rotatably connected to the bushing 221, and the first outer tapered surface 2112 can be pressed against the first inner tapered surface 2211 through the fastening bolt 213.

With the above structure, when the fastening bolt 213 presses the first outer tapered surface 2112 against the first inner tapered surface 2211, a pressing member needs to be disposed at an end of the shaft sleeve 221 away from the first connecting shaft 211, so that the first outer tapered surface 2112 of the first connecting shaft 211 presses against the first inner tapered surface 2211 of the shaft sleeve 221, and the pressing member occupies a large space. In order to reduce the volume, in this embodiment, it is preferable that the inner side surface of the shaft sleeve 221 at the first through hole includes a first inner tapered surface 2211 and a second inner tapered surface 2212, the first inner tapered surface 2211 has a first taper, the second inner tapered surface 2212 has a second taper, the first taper and the second taper are opposite, and the inner diameter of the first through hole gradually decreases from the two ends to the middle section, and the first outer tapered surface 2112 of the first connecting shaft 211 abuts against the first inner tapered surface 2211. The first connecting portion 21 further includes a second connecting shaft 212, the second connecting shaft 212 is connected to the first connecting shaft 211 in a synchronous rotating manner, the first friction surface further includes a second outer conical surface 2122 of the second connecting shaft 212, and the second outer conical surface 2122 abuts against the inner side surface of the first through hole of the shaft sleeve 221 with the second taper, so that the second connecting shaft 212 replaces an abutting part, the second connecting shaft 212 can also rub against the shaft sleeve 221, the contact area between the first connecting portion 21 and the friction material is increased, and the friction loss is further reduced.

Further, since the deformation of the vehicle body causes the propeller shaft to move in the axial direction thereof during the driving of the vehicle, in order to avoid the influence of the axial movement of the propeller shaft on the torque input structure 2 penetrating the drive axle and increase the service life of the torque input structure 2 of the drive axle, the spline groove 2111 is provided on the first connecting shaft 211, the spline groove 2111 extends in the axial direction of the first connecting shaft 211, the spline 2121 capable of being inserted into the spline groove 2111 is provided on the second connecting shaft 212, the fastening bolts 213 respectively pass through the first connecting shaft 211 and the second connecting shaft 212, and are firmly confined between the head of the fastening bolt 213 and the nut 214 near the head of the fastening bolt 213 by a pair of nuts 214, and the first connecting shaft 211 and the second connecting shaft 212 can move between the head of the fastening bolt 213 and the nut 214 near the head of the fastening bolt 213, and further can alleviate the influence of transmission shaft to moment of torsion input structure 2 when the drunkenness.

Further, because the housing 1 penetrating through the drive axle is provided with a mounting hole for connecting the torque input structure 2 penetrating through the drive axle with the transmission shaft, in the vehicle forming process, the transmission shaft and the environment factors penetrating through the drive axle are poor, and there are usually stone, sand, dirt, rainwater, oil stain and other pollutants, in order to avoid the pollutants entering the housing 1 from the mounting hole, the penetrating drive axle further comprises a sealing structure 4, the sealing structure 4 is configured to be a sealing mounting hole, the sealing structure 4 comprises an adjusting ring 41, an O-ring 42, an oil seal 43 and a dust cover 44, the dust cover 44 is fixed on the housing 1 and covers the mounting hole, so that the particulate objects can be prevented from entering the mounting hole. The adjusting ring 41 is sleeved on the shaft sleeve 221, an oil seal 43 is filled between the inner side wall of the adjusting ring 41 and the outer side wall of the shaft sleeve 221, the outer side wall of the adjusting ring 41 is abutted against the inner side wall of the mounting hole of the housing 1, and the O-shaped ring 42 is extruded between the outer side wall of the adjusting ring 41 and the inner side wall of the mounting hole of the housing 1, so that an annular sealing surface is formed between the outer side wall of the shaft sleeve 221 and the inner side wall of the mounting hole, and therefore pollutants such as liquid, oil stains or fine dust can be prevented from entering the housing 1 penetrating through the drive axle from the mounting hole.

Example two

The present embodiment is different from the first embodiment in that the first connection portion 21 and the second connection portion 22 have different structures.

Specifically, as shown in fig. 6, in the present embodiment, the first connecting portion 21 includes a first connecting shaft 211 and a flange 215, the second connecting portion 22 includes a sleeve 221, the first connecting shaft 211 penetrates the sleeve 221 from an end of the sleeve 221 away from the transmission shaft, the input shaft 3 is provided with a cavity for accommodating the first connecting shaft 211, the flange 215 can extend into the sleeve 221 from an end of the sleeve 221 close to the transmission shaft, and is connected with the first connecting shaft 211, the transmission shaft is connected with the flange 215, the first friction surface comprises the outer side surface of the first connecting shaft 211 and the end surface of the first connecting shaft 211 abutted against the shaft sleeve 221, the second friction surface comprises the inner side surface of the shaft sleeve 221 positioned in the first through hole and the end surface of the shaft sleeve 221 abutted against the first connecting shaft 211, and the first connecting shaft 211 is in interference fit with the shaft sleeve 221, and friction materials are arranged on the first friction surface and the second friction surface, so that the contact area between the first connecting part 21 and the friction materials is maximized.

EXAMPLE III

Since the friction materials of the second embodiment are respectively disposed on the first friction surface and the second friction surface, although the contact area is the largest, the shaft sleeve 221 and the first connecting shaft 211 need to be replaced again after being worn, and the cost of replacing parts is high. The torque input structure 2 of the drive axle provided by the embodiment can reduce the cost of replacing parts.

As shown in fig. 7, in the present embodiment, the first connecting portion 21 includes a first connecting shaft 211 and a flange plate 215, the first connecting shaft 211 can be connected to the transmission shaft, a first friction surface is disposed on the first connecting shaft 211, a friction material is disposed on the first friction surface, the flange plate 215 is used for connecting the transmission shaft, and the flange plate 215 is connected to the first connecting shaft 211. The second connection portion 22 includes a bushing 221, and the bushing 221 is provided with a first through hole for the first connection shaft 211 to pass through. The torque input structure of the transaxle further includes a friction block 23, a pair of second bearings 24, and a pair of spacers 25, the pair of second bearings 24 being disposed in the first through hole of the bushing 221 and being defined in the first through hole by the pair of spacers 25, and the first connecting shaft 211 extending into the first through hole from an end of the bushing 221 facing the input shaft 3 and being connected to an inner race of the pair of second bearings 24 so as to be rotatably disposed in the first through hole. Be provided with the second through-hole that can stretch into first through-hole on the lateral surface of axle sleeve 221, clutch blocks 23 stretches into the second through-hole to can dismantle and set up in the second through-hole, and clutch blocks 23 butt in the first connecting axle 211 that is arranged in first through-hole, and clutch blocks 23 is made by friction material, makes clutch blocks 23 and first friction surface friction, thereby when wearing and tearing are serious, only need to change first connecting axle 211 and the lower clutch blocks 23 of cost, has reduced the cost of changing spare part. Preferably, the friction coefficient of the friction material of the friction block 23 is smaller than the friction coefficient of the friction material on the first friction surface, so that the wear of the first connecting shaft 211 can be further reduced, and the cost of replacing parts can be further reduced.

It is understood that, in order to facilitate the detachment of the friction block 23, the friction block 23 can extend into the first through hole through the second through hole of the bushing 221, and in other embodiments, the friction block 23 can be detachably disposed on the inner side wall of the bushing 221, or can be detachably disposed on the bushing 221 at another position where the friction block 23 can abut against the first connecting shaft 211, which is not particularly limited herein.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.