CN212827689U - Drive axle and input assembly, parking braking assembly thereof - Google Patents

Abstract

The invention discloses a drive axle and an input assembly and a parking brake assembly thereof, which comprise a parking brake mounting seat, a pull rod, a rotating shaft, a pressure plate, a plurality of annular second inner friction plates and a plurality of annular second outer friction plates, wherein the parking brake mounting seat is fixedly connected with a first shell and matched with the first shell to form a cavity, the pressure plate can be smoothly and movably arranged on the parking brake mounting seat, the second outer friction plates are arranged in the cavity and are circumferentially positioned and axially movably matched, the second inner friction plates are circumferentially positioned and axially movably matched with a transmission shaft in the input assembly through splines, the second inner friction plates and the second outer friction plates are alternately superposed with each other, the pull rod is in transmission connection or fixed connection with the rotating shaft, the rotating shaft is rotatably arranged on the parking brake mounting seat and pushes the pressure plate to move in the rotating process so as to tightly press the second inner friction plates and the second outer friction plates on the first shell, and further, the transmission stage between the parking handle and the brake friction plate is 1 stage, and the torque is large.

Description

Drive axle and input assembly, parking braking assembly thereof

Technical Field

The invention relates to the technical field of automobiles, in particular to a drive axle and an input assembly and a parking brake assembly thereof.

Background

As is well known, the working condition of the engineering machinery is relatively severe, at present, the market of the axle products of the domestic engineering machinery mainly adopts a dry brake drive axle, and the dry drive axle adopts external dry brake, so that the dry drive axle is greatly influenced by environmental factors such as moisture, freezing, sand and dust, the brake performance is unstable, and the service life is short; the wet brake is built-in, is basically not influenced by environmental factors, has long service life and safe and reliable braking, and is widely applied to the prior engineering machinery.

However, in the prior art, the application of the drive axle to the forklift is a precedent, for example, chinese patent publication No. CN107265354A discloses a forklift driving and parking integrated drive axle, which includes an input assembly, an axle housing, a first half shaft, a second half shaft, a spline housing, a fixed gear ring, and a first brake assembly and a second brake assembly located in the axle housing, and the patent effectively solves the problems of poor braking stability and inconvenient maintenance caused by the original dry braking, in the patent document, the friction plate and the spacer can be maintained and replaced without disassembling the axle housing, but inevitably the friction plate is thinned due to abrasion in the using process, so that the braking force of the braking is reduced, and in order to ensure the driving safety, the friction plate is often abraded to a certain extent and has no use value any more, so that the maintenance cost of the friction plate is high, the service life is low.

In addition, the power of the existing drive axle is often provided by a transmission, so that the vibration transmitted from a hub on the drive axle is easily transmitted to the transmission, when the gearbox body is subjected to the vibration, the vibration of an automobile and the noise of different degrees are caused, and meanwhile, the vibration of the gearbox body also easily causes the damage of internal parts of the transmission;

therefore, chinese patent publication No. CN110043585A discloses a drive axle, which includes an axle housing, an input assembly, a first brake assembly, a first half shaft, a first hub component, a second half shaft, a second brake assembly, and a second hub component, where the second brake assembly has the same structure as the brake assembly, the input assembly is mounted on the axle housing, the first brake assembly is located at the left end of the axle housing, the right section of the first half shaft is connected to the input assembly, the first half shaft passes through the first brake assembly, the second brake assembly is located at the right end of the axle housing, the left section of the second half shaft is connected to the input assembly, and the second half shaft passes through the second brake assembly; the first brake assembly and the second brake assembly can compensate abrasion of the friction plates so as to prolong the service life of the friction plates, and the input assembly can be provided with a buffer mechanism, so that the influence of drive axle vibration on a transmission can be effectively reduced, and the service life of a drive axle is prolonged.

However, those skilled in the art find that the above-mentioned driving axle has the following disadvantages:

1) the input shaft and the output shaft in the input assembly are vertically arranged; the drive axle occupies large space;

2) the friction plate in the service brake assembly is directly arranged on the half shaft, so that the friction plate is convenient to install, but the half shaft is difficult to install, and the opening of the shell is large, so that the structure of the hub component is complex and the transmission relation between the hub component and the half shaft is complex;

3) and the transmission stage number between the parking handle and the brake friction plate in the parking brake assembly is at least 2, and the torque is smaller.

Disclosure of Invention

The invention aims to solve the problem that the transmission stage number between a parking handle and a brake friction plate in a parking brake assembly is at least 2, and provides a drive axle, an input assembly and a parking brake assembly thereof, wherein the transmission stage number between the parking handle and the brake friction plate is 1, and the torque is large.

In order to achieve the purpose, the invention adopts the following technical scheme:

a parking brake assembly of a drive axle is characterized by comprising a parking brake mounting seat, a pull rod, a rotating shaft, a pressure plate, a plurality of annular second inner friction plates and a plurality of annular second outer friction plates, wherein the parking brake mounting seat is fixedly connected with a first shell and matched with the first shell to form a cavity, the pressure plate can be installed on the parking brake installation seat in a smooth moving mode, the second outer friction plates are installed in the cavity and are in circumferential positioning axial movable fit, the second inner friction plates are in circumferential positioning axial movable fit with a transmission shaft in the input assembly through splines, the second inner friction plates and the second outer friction plates are alternately overlapped, the pull rod is in transmission connection or fixed connection with the rotating shaft, the rotating shaft is rotatably mounted on the parking brake mounting seat and pushes the pressure plate to move in the rotating process, so that the second inner friction plate and the second outer friction plate are pressed on the first shell.

Preferably, the pressing plate is further provided with a plurality of pin shafts and a plurality of second springs sleeved on the pin shafts, a plurality of second through holes are formed in the second outer friction plates, the pin shafts penetrate through the second through holes in the plurality of second outer friction plates, the plurality of second springs are sequentially distributed between every two adjacent second outer friction plates, two ends of each second spring are respectively abutted against the two adjacent second outer friction plates, and then the two adjacent second outer friction plates are unfolded through the second springs and the outer friction plate on one side is abutted against the pressing plate.

Preferably, the first shell is provided with a plurality of first positioning holes, the parking brake mounting seat is provided with a plurality of second positioning holes, one end of the pin shaft penetrates through the second outer friction plates and is inserted into the first positioning holes, and the other end of the pin shaft is inserted into the second positioning holes.

Preferably, the rotating shaft is provided with a cam portion, and during rotation of the rotating shaft, the cam portion is matched with the pressure plate so that the pressure plate presses the second inner friction plate and the second outer friction plate on the first shell.

Preferably, the cam part is formed by a groove on the side wall of the rotating shaft, the bottom surface in the groove is a cambered surface, the distance between the bottom surface and the side wall of the rotating shaft is gradually reduced, a sliding part is arranged on the end surface, close to the rotating shaft, of the pressure plate, and the sliding part is clamped in the groove.

Preferably, the parking brake device is further provided with a torsion spring seat and a first torsion spring, the torsion spring seat is installed in the first installation hole and is in transmission connection with the rotating shaft, the torsion spring seat is located below the pull rod, and the first torsion spring is sleeved on the outer surface of the parking brake installation seat and is connected with the torsion spring seat.

Preferably, the rotating shaft is provided with a second flange, the side wall of the torsion spring seat is provided with a circle of V-shaped groove, the side wall of the first mounting hole is provided with at least one fourth through hole, the bottom end of the torsion spring seat of the first through hole abuts against the second flange, and the second bolt penetrates through the fourth through hole and abuts against the inside of the V-shaped groove.

Preferably, a vertical first mounting hole is formed in the parking brake mounting seat, a transverse third through hole is formed in the side wall, close to the first shell, of the first mounting hole, the rotating shaft is rotatably mounted in the first through hole, and the pressing plate moves transversely and is mounted in the third through hole.

An input assembly for a drive axle, comprising a parking brake assembly for a drive axle as described above;

the input shaft is in transmission connection with the motor, the first gear is sleeved on the intermediate shaft and is in transmission connection with the intermediate shaft, the first gear is in transmission fit with the input shaft, the second gear is in transmission fit with the intermediate shaft, the second gear is fixedly connected with the differential assembly, and the input shaft and the intermediate shaft are transversely distributed;

the second inner friction plates are in circumferential positioning axial movable fit with the input shaft; or the second inner friction plates are in circumferential positioning axial movable fit with the intermediate shaft.

A drive axle comprising a parking brake assembly for a drive axle as hereinbefore described.

The invention has the beneficial effects that:

1) the parking brake assembly of the drive axle is optimized through the technical scheme: the parking brake assembly is arranged on the side surface of the input assembly, so that the space height occupied by the drive axle is reduced, and the structure of the drive axle is more reasonable;

in addition, the transmission stage number between the pull rod and the brake friction plate in the parking brake assembly is 1 stage, namely, the transmission torque is large, and the labor is saved for an operator.

Drawings

FIG. 1 is a schematic view of the drive axle transmission of the present invention;

FIG. 2 is a schematic view of the drive configuration of the input assembly of the present invention;

FIG. 3 is a schematic view of the transmission structure of the service brake assembly of the present invention;

FIG. 4 is a schematic diagram of the transmission structure of the parking brake assembly of the present invention;

FIG. 5 is a cross-sectional view of the parking brake mount of the present invention;

FIG. 6 is a cross-sectional view of the torsion spring mount of the present invention;

FIG. 7 is a cross-sectional view of a spindle of the present invention;

FIG. 8 is a cross-sectional view of a second bushing in accordance with the present invention;

fig. 9 is a cross-sectional view of the platen of the present invention.

Description of reference numerals: 2. an input assembly; 3. a service brake assembly; 4. a hub assembly; 101. a first housing; 102. a second housing; 103. a half shaft; 202. a differential housing; 203. a first planetary gear; 204. a half shaft gear; 206. an input shaft; 207. an intermediate shaft; 208. a first gear; 209. a second gear; 210. a motor; 301. a first bushing; 302. a piston; 303. a first outer friction plate; 304. a first inner friction plate; 401. a second shaft sleeve; 402. a hub member; 403. a first tapered roller bearing; 404. a first oil seal; 405. a second oil seal; 4013. a first blocking portion; 4014. a second blocking portion; 305. a circlip; 306. a first latch; 307. a first spring; 4011. a boss portion; 4012. a flange portion; 308. a return spring seat; 309. a return spring; 310. a return spring screw; 311. a first seal ring; 312. a second seal ring; 3101. a first flange; 211. a parking brake mounting seat; 212. a pull rod; 213. a rotating shaft; 214. a platen; 215. a second inner friction plate; 216. a second outer friction plate; 217. a pin shaft; 218. a second spring; 2131. a cam portion; 2141. a sliding part; 219. a torsion spring seat; 220. a first torsion spring; 221. a second bolt; 222. a third seal ring; 223. a fourth seal ring; 2111. a fourth via hole; 2132. a second flange; 2191. a V-shaped groove; 2112. a first mounting hole; 2113. a third through hole; 2114. a cavity; 2115. and a second positioning hole.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "coupled," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

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 present invention, the differential assembly is directed "inboard" from the hub assembly and "outboard" from the differential assembly.

In the present invention, "lateral" and "vertical" are both based on the orientation in fig. 1.

A drive axle comprises an axle housing, an input assembly 2, two service brake assemblies 3, two coaxially distributed half shafts 103 and two hub assemblies 4, wherein the axle housing comprises a first shell 101 and two second shells 102 which are fixedly connected, the two second shells 102 are respectively positioned at the left side and the right side of the first shell 101, the service brake assemblies 3 are positioned in the second shells 102 and sleeved on the half shafts 103, the hub assemblies 4 are arranged at the outer ends of the second shells 102 and fixedly connected with the outer ends of the half shafts 103, and the input assembly 2 is arranged on the first shell 101;

as shown in fig. 2, the input assembly 2 includes a differential assembly including a differential case 202, a first planetary gear 203 and two side gears 204, the differential case 202 is mounted on the inside of the first case 101 and can rotate in the first case 101, the first planetary gear 203 is mounted inside the differential case 202 and can rotate along with the differential case 202, the two side gears 204 are respectively located at the left and right sides of the inside of the differential case 202, the two side gears 204 are both meshed with the first planetary gear 203, and the inner ends of the half shafts 103 extend into the differential case 202 and are in transmission coupling with the side gears 204;

in the present embodiment, the input assembly 2 further includes an input shaft 206, an intermediate shaft 207, a first gear 208 and a second gear 209 mounted on the first housing 101, the input shaft 206 is in transmission coupling with the motor 210, the first gear 208 is sleeved on the intermediate shaft 207 and is in transmission coupling with the intermediate shaft 207, the first gear 208 is in transmission engagement with shaft teeth of the input shaft 206, the second gear 209 is in transmission engagement with shaft teeth of the intermediate shaft 207, the second gear 209 is fixedly connected with the differential housing 202, and the input shaft 206, the intermediate shaft 207 and the two half shafts 103 are all laterally distributed;

as shown in fig. 3, the service brake assembly 3 includes a first shaft sleeve 301, an annular piston 302, a plurality of annular first outer friction plates 303 and a plurality of annular first inner friction plates 304, the first shaft sleeve 301 is in transmission fit with the half shaft 103 through an inner spline, the first outer friction plates 303 are in circumferential positioning axial clearance fit with the first shell 101, the first inner friction plates 304 are in circumferential positioning axial clearance fit with the first shaft sleeve 301, the plurality of annular first inner friction plates 304 and the plurality of annular first outer friction plates 303 are alternately stacked with each other, and the piston 302 is mounted on the second shell 102 and can move between a braking position and a non-braking position;

the hub component 4 comprises a second shaft sleeve 401 and a hub piece 402, the second shaft sleeve 401 is sleeved on the half shaft 103 and is fixedly connected with the outer end of the second shell 102, and the hub piece 402 is fixedly connected with the half shaft 103;

when the service brake assembly 3 is in a braking state, the piston 302 moves to a braking position, so that the first inner friction plates 304 and the first outer friction plates 303 are abutted and pressed on the second shaft sleeve 401.

The input shaft 206 and the output shaft are transversely arranged, so that the transmission structure in the drive axle is effectively improved, the structure of the drive axle housing is reasonable, the volume is reduced, and the occupied space of the drive axle is reduced; in addition, a bearing plate is saved, so that the structure of parts of the drive axle is more simplified, and the cost is saved.

In this embodiment, two first tapered roller bearings 403 are further provided, the first tapered roller bearings are sleeved on the second shaft sleeve 401, and the outer surfaces of the tapered roller bearings abut against the inner surface of the hub 402; further preferably, the second sleeve 401 is provided with a first blocking portion 4013 and a second blocking portion 4014 for preventing the tapered roller bearing from moving axially, wherein the first blocking portion 4013 is formed by a protrusion on the second sleeve 401, and the second blocking portion 4014 is detachably coupled with the second sleeve 401, so as to facilitate the installation of the two first tapered roller bearings 403.

In this embodiment, there are also provided a first oil seal 404 and a second oil seal 405, the first oil seal 404 being located between the second bushing 401 and the hub member 402, and the second oil seal 405 being located between the half shaft 103 and the second bushing 401.

In this embodiment, an elastic retainer ring 305 is further provided, an axial spline groove and a circumferential annular groove are provided on the outer surface of the first shaft sleeve 301, a plurality of first mounting grooves are provided on the inner side wall of the second housing 102, and the first outer friction plate 303 is clamped in the first mounting grooves; the first inner friction plates 304 are clamped in the spline grooves and further in transmission connection with the first shaft sleeve 301, and the elastic retainer rings 305 are clamped in the annular grooves and located between any two adjacent first inner friction plates 304; this arrangement accomplishes the axial positioning of the first boss 301 by the engagement of the first outer friction plate 303 with the first fitting groove, the engagement of the first inner friction plate 304 with the first outer friction plate 303, and the engagement of the first inner friction plate 304 with the circlip 305.

Further preferably, the thickness of the circlip 305 is smaller than the thickness of the first outer friction plate 303.

In this embodiment, a plurality of first pins 306 which are uniformly distributed circumferentially and a plurality of first springs 307 which are sleeved on the first pins 306 are further provided, a plurality of first through holes which are uniformly distributed circumferentially are provided on the first outer friction plates 303, one end of each first pin 306 penetrates through the first through holes on the first outer friction plates 303 and abuts against the second shell 102, the other end of each first pin 306 abuts against the second shaft sleeve 401, the plurality of first springs 307 are sequentially distributed between the two adjacent first outer friction plates 303, and two ends of each first spring 307 respectively abut against the two adjacent first outer friction plates 303, so that the two adjacent first outer friction plates 303 are separated from each other by a certain distance through the first springs 307. The arrangement makes the two first outer friction plates 303 spread more thoroughly, and avoids the friction force or larger friction force generated between the first inner friction plate 304 and the first outer friction plate 303 in the non-braking state.

In the present embodiment, as shown in fig. 8, the second bushing 401 includes a bushing portion 4011 and a flange portion 4012 which are integrally formed, the flange portion 4012 is fixedly mounted on the outer end surface of the second housing 102 by a plurality of fasteners, the other end of the first pin 306 abuts against the inner end surface of the flange portion 4012, and when the piston 302 moves to the braking position, the plurality of first inner friction plates 304 and the first outer friction plates 303 are pressed against the inner end surface of the flange portion 4012.

In this embodiment, the service brake assembly 3 further includes a return spring seat 308, a return spring 309 and a return spring screw 310, which are located in the second housing 102, the return spring 309 enables the annular piston 302 to move from the braking position to the non-braking position, a plurality of second mounting holes are uniformly distributed on the side surface of the piston 302, the return spring seat 308 is installed in the second mounting holes in an interference fit manner, the return spring screw 310 penetrates through the return spring seat 308 and is installed on the second housing 102, the return spring 309 is sleeved on the return spring screw 310, and one end of the return spring 309 abuts against the return spring seat 308, and the other end of the return spring 309 abuts against the return spring screw 310.

The outer surface of the return spring seat 308 is a cylindrical surface and is in interference fit with the second mounting hole, and it should be noted that the outer surface of the return spring seat 308 may also be in other shapes, such as a prism, a cuboid, etc., and the corresponding second mounting hole may be in interference fit with the outer surface of the return spring seat 308, specifically, the return spring seat 308 and the annular piston 302 may be mutually driven to move, and when the first inner friction plate 304 and the first outer friction plate 303 are worn, the return spring screw 310 limits the stroke of the return spring seat 308 to be a first gap, the annular piston 302 and the first outer friction plate 303 still have a gap, and the annular piston 302 may still axially move under the action of oil pressure until the end surface abuts against the first outer friction plate 303.

Specifically, the end face of the annular piston 302 located on the outer side can abut against the first outer friction plate 303, the end face of the annular piston 302 located on the inner side can abut against the first casing 101, a first annular groove and a second annular groove are formed in the circumferential side wall of the annular piston 302, and a first sealing ring 311 and a second sealing ring 312 are respectively arranged in the first annular groove and the second annular groove.

Specifically, the return spring screw 310 is provided with a first flange 3101, the return spring 309 abuts against the first flange 3101 at one end and the return spring seat 308 at the other end, the distance between the first flange 3101 and the return spring seat 308 is a first clearance, when the annular piston 302 moves from the non-braking position to the braking position against the first outer friction plate 303, the first flange 3101 may abut the return spring seat 308, thereby limiting the travel of the return spring seat 308 to a first clearance, in this embodiment, the first flange 3101 may be disc-shaped or have other shapes, as long as when the annular piston 302 moves from the non-braking position to the braking position against the first outer friction plate 303, the first flange 3101 may abut against the return spring seat 308, in this embodiment, the first flange 3101 is preferably disk-shaped with a disk diameter greater than the spring seat inner diameter so as to abut against the return spring seat 308.

When the friction plate is not worn and is in a non-braking state, the inner end surface of the annular piston 302 abuts against a mounting surface in the second housing 102, for convenience of confirmation in this embodiment, the name of the mounting surface in the second housing 102 is called a first mounting surface, the return spring seat 308 is in interference fit with the second mounting hole in the annular piston 302, and one end surface of the return spring seat 308 abuts against the first mounting surface, and in this state, the distance between the first flange 3101 on the return spring screw 310 and the return spring seat 308 is a first gap.

When pressurized oil enters the oil cavity, the annular piston 302 drives the return spring seat 308 to move from the non-braking position where the first outer friction plate 303 is separated to the braking position where the return spring seat abuts against the first outer friction plate 303 until the annular piston 302 reaches a braking point where the annular piston abuts against the first outer friction plate 303, the outer end surface of the annular piston 302 abuts against the first outer friction plate 303, the inner end surface of the annular piston 302 is still flush with the end surface of one end of the return spring seat 308, and the outer end surface of the return spring seat 308 abuts against the first flange 3101 on the return spring screw 310, in this state, the distance between the return spring seat 308 and the first mounting surface is a first gap, and the distance between the inner end surface of the annular piston 302 and the first mounting surface is also a first gap, namely, the displacements of the return spring seat 308 and the annular piston 302 are both.

When the first inner friction plate 304 and the first outer friction plate 303 are worn, the return spring screw 310 limits the stroke of the return spring seat 308 to a first clearance, the annular piston 302 can still axially move until the end surface abuts against the first outer friction plate 303, when the annular piston 302 reaches a braking position abutting against the first outer friction plate 303, the inner end surface of the annular piston 302 is not flush with the inner end surface of the return spring seat 308, the inner end surface of the return spring seat 308 protrudes inwards by a part relative to the inner end surface of the annular piston 302, the outer end surface of the return spring seat 308 abuts against the first flange 3101 on the return spring screw 310, and in this state, the distance between the return spring seat 308 and the first mounting surface is the first clearance, the distance between the inner end surface of the annular piston 302 and the first mounting surface is the second clearance, and the second clearance is larger than the first clearance.

Pressure oil is discharged in the oil cavity, the return spring seat 308 moves away from the first inner friction plate 304 and the first outer friction plate 303 under the action of the return spring 309, and the annular piston 302 is driven to move together to a non-braking state, in the process, the displacement of the return spring seat 308 and the displacement of the annular piston 302 are both first clearances, so that a third clearance exists between the inner end surface of the annular piston 302 and the first mounting surface, the sum of the third clearance and the first clearance is a second clearance, the inner end surface of the return spring seat 308 protrudes partially relative to the inner end surface of the annular piston 302, and the inner end surface of the return spring seat 308 still abuts against the first mounting surface, and in the state, the distance between the first flange 3101 on the return spring screw 310 and the return spring seat 308 is the first clearance.

It should be noted that, in the process that the annular piston 302 reaches the non-braking position separated from the first outer friction plate 303 from the braking point abutting against the first outer friction plate 303, no matter whether the first inner friction plate 304 and the first outer friction plate 303 are worn or not, the return spring seat 308 drives the annular piston 302 to move together in the direction away from the first inner friction plate 304 and the first outer friction plate 303, the moving distance is always a first gap under the limit of the first flange 3101 and the first mounting surface, that is, the return distance of the annular piston 302 is always a first gap, that is, when the annular piston 302 reaches the braking position of the annular piston 302 abutting against the first outer friction plate 303 from the non-braking position separated from the first outer friction plate 303, the displacement required by the annular piston 302 is always the first gap, so as to achieve the purpose of compensating the wear of the first inner friction plate 304 and the first outer friction plate 303, in the use process of the brake assembly, the brake distance is kept unchanged all the time, the brake effect is guaranteed, the first inner friction plate 304 and the first outer friction plate 303 are durable, and the maintenance cost of the first inner friction plate 304 and the first outer friction plate 303 is reduced.

In addition, as the degree of wear of the first inner friction plate 304 and the first outer friction plate 303 increases, the braking position of the annular piston 302 is also continuously moved outward, that is, the displacement distance of the inner first outer friction plate 303 is also continuously increased under the condition of ensuring the braking effect, but the elasticity between the inner first outer friction plates 303 is reduced along with the increase of the degree of wear of the friction plates, so that the friction plates are ensured to still return to the initial position after braking is completed by additionally arranging a spring between the friction plates, and the phenomenon that the inner first outer friction plate 303 is not completely unfolded to cause sluggish feeling in the driving process under the non-braking state is avoided.

In this embodiment, the input assembly 2 further includes a parking brake assembly as shown in fig. 4, the parking brake assembly includes a parking brake mounting seat 211, a pull rod 212, a rotating shaft 213, a pressure plate 214, a plurality of annular second inner friction plates 215 and a plurality of annular second outer friction plates 216, the parking brake mounting seat 211 is fixedly connected with the first housing 101 and together forms a cavity 2114, the pressure plate 214 is smoothly and movably mounted on the parking brake mounting seat 211, the plurality of second outer friction plates 216 are mounted in the cavity 2114 and circumferentially and axially movably engaged, the plurality of second inner friction plates 215 are circumferentially and axially movably engaged with a transmission shaft in the input assembly 2 through splines, the plurality of second inner friction plates 215 and the plurality of second outer friction plates 216 are alternately stacked, the pull rod 212 is in transmission connection with or fixed connection with the rotating shaft 213, the rotating shaft 213 is rotatably mounted on the parking brake mounting seat 211 and pushes the pressure plate 214 to move during rotation, so as to press the second inner friction plate 215 and the second outer friction plate 216 against the first housing 101, and further to make the transmission shaft in the driving axle in transmission connection with the second inner friction plate 215 unable to rotate, i.e. to complete the parking brake.

In this embodiment, as shown in fig. 5, a vertical first installation hole 2112 is formed in the parking brake installation seat 211, a lateral third through hole 2113 is formed in a side wall of the first installation hole 2112 close to the first housing 101, the rotating shaft 213 is rotatably installed in the first through hole, and the pressure plate 214 is installed in the third through hole 2113 in a lateral moving manner.

In the present embodiment, a plurality of second inner friction plates 215 are axially movably engaged with the input shaft 206 in a circumferential positioning manner through splines; in other embodiments, a plurality of second inner friction plates 215 are splined and axially movably engaged with the intermediate shaft 207 in a circumferentially oriented manner.

In this embodiment, a plurality of pin shafts 217 uniformly distributed in a circumferential direction and a plurality of second springs 218 sleeved on the pin shafts 217 are further provided, a plurality of second through holes uniformly distributed in a circumferential direction are provided on the second outer friction plates 216, the pin shafts 217 penetrate through the second through holes on the second outer friction plates 216, the second springs 218 are sequentially distributed between two adjacent second outer friction plates 216, and two ends of each second spring 218 respectively abut against the two adjacent second outer friction plates 216, so that the two adjacent second outer friction plates 216 are unfolded through the second springs 218 and the outer friction plate on one side abuts against the pressure plate 214. This is because the rotation shaft 213 cannot bring the pressure plate 214 back to the initial position after braking is completed, and therefore the pressure plate 214 is pushed back to the initial position by the action of the second spring 218, and the braking state is released.

Preferably, a plurality of first positioning holes are formed in the first housing 101 and are uniformly distributed circumferentially, a plurality of second positioning holes 2115 are formed in the parking brake mounting seat 211 and are uniformly distributed circumferentially, one end of the pin 217 penetrates through the plurality of second outer friction plates 216 and is inserted into the first positioning holes, and the other end of the pin 217 is inserted into the second positioning holes 2115.

In this embodiment, as shown in fig. 7, the rotating shaft 213 is provided with a cam portion 2131, and during the rotation of the rotating shaft 213, the cam portion 2131 cooperates with the pressure plate 214 to enable the pressure plate 214 to press the second inner friction plates 215 and the second outer friction plates 216 against the first housing 101.

Further preferably, the cam portion 2131 is formed by a groove on the side wall of the rotating shaft 213, the bottom surface in the groove is a curved surface, and the distance between the curved surface and the side wall of the rotating shaft 213 decreases gradually, as shown in fig. 9, a sliding portion 2141 is provided on the end surface of the pressure plate 214 close to the rotating shaft 213, and the sliding portion 2141 is clamped in the groove.

It should be noted that the cam portion 2131 and the sliding portion 2141 cooperate to not only move the pressure plate 214, but also limit two degrees of freedom of the rotating shaft 213 in the vertical direction, i.e., the rotating shaft 213 is firmly mounted on the parking brake mounting seat 211 by the cooperation of the cam portion 2131 and the sliding portion 2141.

In this embodiment, a torsion spring seat 219 and a first torsion spring 220 are further provided, as shown in fig. 6, the torsion spring seat 219 is installed in the first installation hole 2112 and is in transmission connection with the rotating shaft 213, the torsion spring seat 219 is located below the pull rod 212, and the first torsion spring 220 is sleeved on the exterior of the parking brake installation seat 211 and is connected with the torsion spring seat 219. The arrangement is such that the rotating shaft 213 can automatically return to the initial position under the action of the first torsion spring 220 after rotating.

Preferably, at least one second bolt 221 is further provided, the rotating shaft 213 is provided with a second flange 2132, the side wall of the torsion spring seat 219 is provided with a circle of V-shaped groove 2191, the side wall of the first mounting hole 2112 is provided with at least one fourth through hole 2111, the bottom end of the first through hole torsion spring seat 219 abuts against the second flange 2132, and the second bolt 221 passes through the fourth through hole 2111 and abuts against the V-shaped groove 2191; with this arrangement, the torsion spring holder 219 is mounted on the parking brake mount 211, and the degree of freedom of the rotating shaft 213 in the vertical direction is further restricted.

In this embodiment, a third seal ring 222 is further provided, and the third seal ring 222 is respectively abutted against the parking brake mounting seat 211 and the first housing 101, that is, the third seal ring 222 is mainly used for sealing a gap between the parking brake mounting seat 211 and the first housing 101.

In this embodiment, a fourth sealing ring 223 is further provided, and the fourth sealing ring 223 abuts against the parking brake mounting seat 211 and the torsion spring seat 219, that is, the fourth sealing ring 223 is mainly used for sealing a gap between the parking brake mounting seat 211 and the torsion spring seat 219.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A parking brake assembly of a drive axle is characterized by comprising a parking brake mounting seat (211), a pull rod (212), a rotating shaft (213), a pressure plate (214), a plurality of annular second inner friction plates (215) and a plurality of annular second outer friction plates (216),

the pull rod (212) is in transmission connection or fixed connection with a rotating shaft (213), the rotating shaft (213) is rotatably mounted on the parking brake mounting seat (211) and pushes the pressure plate (214) to move in the rotating process so as to press the second inner friction plate (215) and the second outer friction plate (216) on the first shell (101), and parking braking is completed.

2. The parking brake assembly of the drive axle according to claim 1, further comprising a plurality of pin shafts (217) and a plurality of second springs (218) sleeved on the pin shafts (217), wherein a plurality of second through holes are formed in the second outer friction plates (216), the pin shafts (217) pass through the second through holes in the second outer friction plates (216), the plurality of second springs (218) are sequentially distributed between two adjacent second outer friction plates (216), two ends of each second spring (218) respectively abut against two adjacent second outer friction plates (216), and therefore the two adjacent second outer friction plates (216) are unfolded through the second springs (218) and the outer friction plate on one side abuts against the pressure plate (214).

3. The parking brake assembly of the drive axle according to claim 2, wherein a plurality of first positioning holes are formed in the first housing (101), a plurality of second positioning holes (2115) are formed in the parking brake mounting seat (211), one end of the pin shaft (217) passes through the plurality of second outer friction plates (216) and is inserted into the first positioning holes, and the other end of the pin shaft (217) is inserted into the second positioning holes (2115).

4. The parking brake assembly of the drive axle according to claim 1, wherein the parking brake mounting seat (211) is fixedly connected with the first shell (101) and is matched with the first shell to form a cavity (2114), the pressure plate (214) is smoothly and movably mounted on the parking brake mounting seat (211), a plurality of second outer friction plates (216) are mounted in the cavity (2114) and are circumferentially positioned and axially movably matched, a plurality of second inner friction plates (215) are circumferentially positioned and axially movably matched with a transmission shaft in the input assembly (2) through splines, and a plurality of second inner friction plates (215) and second outer friction plates (216) are alternately overlapped with each other.

5. A parking brake assembly for a drive axle according to claim 1, wherein the rotary shaft (213) is provided with a cam portion (2131), and during rotation of the rotary shaft (213), the cam portion (2131) cooperates with the pressure plate (214) to cause the pressure plate (214) to press the second inner friction plate (215) and the second outer friction plate (216) against the first housing (101);

the cam part (2131) is formed by a groove on the side wall of the rotating shaft (213), the bottom surface in the groove is an arc surface, the distance between the bottom surface and the side wall of the rotating shaft (213) is gradually reduced, a sliding part (2141) is arranged on the end surface, close to the rotating shaft (213), of the pressure plate (214), and the sliding part (2141) is clamped in the groove.

6. The parking brake assembly of the drive axle according to claim 1, further comprising a torsion spring seat (219) and a first torsion spring (220), wherein the torsion spring seat (219) is installed in the first installation hole (2112) and is in transmission connection with the rotating shaft (213), the torsion spring seat (219) is located below the pull rod (212), and the first torsion spring (220) is sleeved on the outer surface of the parking brake installation seat (211) and is connected with the torsion spring seat (219).

7. The parking brake assembly of the drive axle according to claim 6, further comprising at least one second plug pin (221), wherein the rotating shaft (213) is provided with a second flange (2132), the side wall of the torsion spring seat (219) is provided with a circle of V-shaped groove (2191), the side wall of the first mounting hole (2112) is provided with at least one fourth through hole (2111), the bottom end of the first through hole torsion spring seat (219) abuts against the second flange (2132), and the second plug pin (221) penetrates through the fourth through hole (2111) and abuts against the V-shaped groove (2191).

8. The parking brake assembly of the drive axle according to claim 1, wherein a vertical first mounting hole (2112) is formed in the parking brake mounting seat (211), a transverse third through hole (2113) is formed in the side wall, close to the first housing (101), of the first mounting hole (2112), the rotating shaft (213) is rotatably mounted in the first through hole, and the pressure plate (214) is transversely movably mounted in the third through hole (2113).

9. An input assembly for a drive axle, comprising a parking brake assembly for a drive axle according to any one of claims 1 to 8;

the differential mechanism is characterized by further comprising an input shaft (206), a differential assembly, an intermediate shaft (207), a first gear (208) and a second gear (209), wherein the input shaft (206) is mounted on the first shell (101), the input shaft (206) is in transmission connection with a motor (210), the first gear (208) is sleeved on the intermediate shaft (207) and is in transmission connection with the intermediate shaft (207), the first gear (208) is in transmission connection with shaft teeth of the input shaft (206), the second gear (209) is in transmission connection with shaft teeth of the intermediate shaft (207), the second gear (209) is fixedly connected with the differential assembly, and the input shaft (206) and the intermediate shaft (207) are transversely distributed;

a plurality of second inner friction plates (215) are in circumferential positioning axial movable fit with the input shaft (206); or a plurality of second inner friction plates (215) are in circumferential positioning axial movable fit with the intermediate shaft (207).

10. Drive axle, characterized in that it comprises a parking brake assembly of a drive axle according to any one of claims 1-8.

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