CN210397531U

CN210397531U - Wet-type braking transaxle

Info

Publication number: CN210397531U
Application number: CN201920600109.7U
Authority: CN
Inventors: 金刚强
Original assignee: Zhejiang Jindao Technology Co ltd
Current assignee: Zhejiang Jindao Technology Co ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2020-04-24
Anticipated expiration: 2029-04-28

Abstract

The utility model discloses a wet braking transaxle, including axle housing, input assembly, first stopper assembly, first semi-axis, first wheel hub subassembly, second semi-axis, second stopper assembly and second wheel hub subassembly, second stopper assembly is the same with stopper assembly structure, the input assembly is installed on the axle housing, first stopper assembly is located the axle housing left end, first semi-axis right side section links to each other with the input assembly, first semi-axis passes first stopper assembly, second stopper assembly is located the axle housing right-hand member, second semi-axis left side section is connected with the input assembly, the second semi-axis passes second stopper 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 the drive axle is prolonged.

Description

Wet-type braking transaxle

Technical Field

The invention relates to the technical field of automobiles, in particular to a wet brake drive axle.

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 an 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, a wet brake drive axle is applied to a forklift, and as disclosed in chinese patent publication No. CN107265354A, a forklift driving and parking integrated wet brake drive axle 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, which effectively solves the problems of poor braking stability and inconvenient maintenance caused by the original dry brake, in the patent document, the axle housing can be maintained and replaced without disassembling the axle housing, but inevitably the friction plate becomes thinner due to abrasion in the use process, thereby reducing the braking force of the brake, and in order to ensure the safety of the running of the friction plate, the wet brake drive axle is no longer valuable when the friction plate is abraded to a certain extent, thereby causing the maintenance cost of friction disc to be high, life hangs down.

In addition, the power of the conventional wet brake drive axle is often provided by the transmission, so that the vibration transmitted from the hub on the drive axle is easily transmitted to the transmission, and when the transmission case is subjected to the vibration, the vibration of the automobile and the noise of different degrees are generated, and meanwhile, the vibration of the transmission case also easily causes the damage of the internal parts of the transmission, so that the transmission is prevented from being directly connected with the drive axle by arranging the transmission shaft between the transmission input shaft and the drive axle in the chinese patent publication No. CN109185420A, but the efficiency of the transmission is reduced, and the volume and the cost of the wet brake drive axle are increased.

Disclosure of Invention

A first object of the present invention is to provide a brake assembly, which can solve the above-mentioned problem of wear of the friction plates, and the piston of the brake can automatically adjust the clearance between the piston and the friction plates according to the wear of the friction plates, so that the braking force of the brake can be maintained at a normal level for a long time.

The second objective of the present invention is to provide an input assembly for solving the problem of vibration transmission between the transmission and the drive axle, wherein the input assembly is provided with a buffer mechanism, so as to effectively reduce the influence of the drive axle vibration on the transmission, prolong the service life of the drive axle, and compared with the existing buffer mechanism, the input assembly has a small volume and a high space utilization rate, and is more suitable for forklift installation.

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

a brake assembly comprises an inner friction plate, an outer friction plate, a bearing plate, an annular piston, a return spring seat and a return spring screw which are positioned in a first shell, wherein the bearing plate, the outer friction plate and the first shell are in circumferential positioning axial movable fit, the inner friction plate and a first semi-axis are in circumferential positioning axial movable fit, a plurality of annular inner friction plates and a plurality of annular outer friction plates are alternately overlapped, the annular piston moves between a braking position and a non-braking position, the return spring enables the annular piston 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 annular piston, the return spring seat is arranged in the second mounting holes in an interference fit manner, the return spring screw penetrates through the return spring seat and is arranged on the first shell, the return spring is sleeved on the return spring screw, and one end of the, the other end of the spring abuts against the return spring screw.

The return spring bolt limits the stroke of the return spring seat to be a first clearance, the annular piston and the return spring seat move together in an interference fit mode, and when the inner friction plate and the outer friction plate are in an unworn state, the displacement stroke between the braking position and the non-braking position of the annular piston is not larger than the first clearance; when the inner friction plate and the outer friction plate are abraded, the annular piston and the return spring seat are still fixed in an interference fit mode after relative displacement is generated between the annular piston and the return spring seat, the return spring screw limits the stroke of the return spring seat to be a first gap, and therefore the displacement stroke between the braking position and the non-braking position of the annular piston is the first gap.

Preferably, the return spring screw is provided with a first flange, the central hole of the return spring seat is a stepped hole, one end of the return spring abuts against the first flange of the return spring screw, and the other end of the return spring abuts against the step of the central hole of the return spring seat.

Preferably, the distance between the first flange and the return spring seat is a first clearance, and the first flange may abut against the return spring seat when the annular piston moves from the non-braking position to the braking position, thereby limiting the travel of the return spring seat to the first clearance.

Preferably, the distance between the first flange and the return spring seat is a first clearance, and the first flange may abut against the return spring seat when the annular piston moves from the non-braking position to the braking position against the outer friction plate, thereby limiting the stroke of the return spring seat to the first clearance.

Preferably, one side face of the annular piston can abut against the outer friction plate, the other side face of the annular piston can abut against the first shell, a first annular groove and a second annular groove are formed in the circumferential side wall of the annular piston, and a first sealing ring and a second sealing ring are arranged in the first annular groove and the second annular groove respectively.

Preferably, the bearing plate is annular, the bearing plate is coaxial with the inner friction plate and the outer friction plate and supports against the outer friction plate, and the bearing plate and the annular piston are respectively positioned on different sides of the inner friction plate and the outer friction plate.

Preferably, the bearing plate is further provided with a mandrel, the mandrel is in circumferential positioning fit with the outer friction plate, a plurality of fourth mounting holes are uniformly distributed in the circumferential direction on the bearing plate, and the mandrel penetrates through the fourth mounting holes and fixes the bearing plate in the first shell.

Preferably, the brake device is further provided with a first retaining ring and a second retaining ring, the first retaining ring and the second retaining ring are sleeved on the first half shaft and are coaxial with the inner friction plate, and the first retaining ring and the second retaining ring are located on two sides of the inner friction plate, so that the axial movement range of the inner friction plate is limited.

Due to the adoption of the technical scheme, the invention has the following optimization on the basis of the prior art:

considering the abrasion condition of the friction plate in daily use, a compensation structure is additionally arranged in the brake assembly, namely, the return spring seat and the annular piston are in interference fit, in the braking process, the annular piston drives the return spring seat to move towards the inner friction plate and the outer friction plate, when the piston reaches a braking point of abutting against the outer friction plate, the movement distance of the annular piston and the return spring seat is a first gap, which is the condition that the inner friction plate and the outer friction plate have no abrasion, and when the inner friction plate and the outer friction plate are abraded, the annular piston drives the return spring seat to move towards the friction plate, when the braking point is reached, the movement distance of the return spring seat is the first gap, the movement distance of the annular piston is the abrasion thickness of the first gap plus the friction plate, and in the braking releasing process, the return spring seat drives the annular piston to move towards the direction far away from the, the movement distance of the return spring seat is a first clearance, so that the movement distance of the annular piston is also the first clearance, the purpose of compensating abrasion of the friction plate is achieved, the braking distance is always kept unchanged in the use process of the brake assembly, the braking effect is guaranteed, the friction plate is durable, and the maintenance cost of the friction plate is reduced.

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

an input assembly comprises a differential seat, a differential, a power input shaft, an input flange and a brake flange which are arranged on the differential seat, the differential mechanism comprises a differential mechanism shell, a first planetary gear, a second half axle gear and a first half axle gear, wherein the differential mechanism shell is arranged on a differential mechanism seat and can rotate on the differential mechanism seat, the differential mechanism shell is fixedly provided with the second bevel gear which is mutually meshed with the first bevel gear, the first planetary gear is rotatably arranged in the differential mechanism shell, the first half axle gear and the second half axle gear are respectively positioned at the left side and the right side in the differential mechanism shell, the first half shaft gear and the second half shaft gear are both meshed with the first planetary gear, the first half shaft penetrates through the differential shell and is fixedly connected with the first half shaft gear in an inserting mode, and the second half shaft penetrates through the differential shell and is fixedly connected with the second half shaft gear in an inserting mode; compared with the prior art, the improved structure has the advantages that the brake flange is matched with the power input shaft through the spline and is fixed through the fastener, the input flange is in transmission fit with the brake flange through the spline, and the input flange can axially float on the brake flange.

Preferably, the brake flange is provided with a first central hole, the inner half section of the first central hole is a spline hole matched with the power input shaft, and the outer half section of the first central hole is a spline hole matched with the outer wall of the input flange.

Preferably, a dustproof ring is arranged between the input flange and the braking flange, and the dustproof ring is sleeved on the input flange and is positioned at an outer port of the first center hole of the braking flange.

Preferably, the first central hole of the braking flange is a stepped hole, the inner half section of the first central hole is smaller than the outer half section of the first central hole in diameter, a first nut is in threaded connection with one end, extending into the first central hole of the braking flange, of the power input shaft, and the first nut is abutted and fixed with a step in the first central hole of the braking flange.

Preferably, the differential seat is provided with a first mounting hole, the power input shaft and the brake flange are mounted on the first mounting hole, the power input shaft is sleeved with a sealing ring, a spacer bush and two first bearings, the two first bearings are matched with the first mounting hole and the power input shaft, the spacer bush is positioned between the two first bearings, and the sealing ring is tightly attached to the first nut.

Preferably, the brake device is further provided with a first oil seal, the first oil seal is located at the port of the first mounting hole and sleeved on the brake flange, and the first oil seal is in interference fit with the first mounting hole and the brake flange.

Preferably, a parking brake is further provided, which is mounted on the differential carrier by means of fasteners and can clamp the brake flange against rotation.

the input flange and the brake flange are additionally arranged between the gearbox and the input assembly, compared with the existing transmission shaft which is additionally arranged, the input flange which is coaxial with the power input shaft and can axially float relative to the brake flange is only additionally arranged, so that the vibration between the input assembly and the gearbox is only transmitted to the input flange, and the vibration can be offset by the axial float of the input flange, so that the independence of the input assembly and the gearbox is increased, the structure is more compact and reasonable, the volume is small, the space utilization rate is high, and the forklift is more suitable for forklift installation.

The invention also provides a drive axle which comprises the brake assembly and the input assembly.

Preferably, the brake device further comprises an axle housing, a first half shaft, a first wheel hub component, a second half shaft, a second brake assembly and a second wheel hub component, wherein the second brake assembly is identical to the brake assembly in structure, the axle housing comprises a second shell, a first shell and a third shell, the middle section of the first shell is cylindrical, two ends of the first shell are horn-shaped openings, the first brake assembly is identical to the second brake assembly in structure, the first wheel hub component and the second wheel hub component are identical in structure, the input assembly is installed on the first shell, the first brake assembly is located at the left half section of the first shell, the first wheel hub component is installed on the second shell, the second shell is fixed at the left end of the first shell, the right section of the first half shaft is connected with the input assembly, the first half shaft is connected with the first wheel hub component through the first brake assembly, the second brake assembly is located at the right half section of the first shell, the second wheel hub assembly is installed on a third shell, the third shell is fixed at the right end of the first shell, the left section of the second half shaft is connected with the input assembly, and the second half shaft is connected with the second wheel hub assembly through a second brake assembly.

Drawings

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

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a cross-sectional view A-A of FIG. 1;

FIG. 4 is an enlarged fragmentary view at O of FIG. 3 of the wet brake transaxle of the present invention;

FIG. 5 is an enlarged fragmentary view at P of FIG. 3 of the wet brake transaxle of the present invention;

FIG. 6 is a schematic view of a brake release state of the wet brake transaxle of the present invention (no wear of the friction plates);

FIG. 7 is a schematic view of the wet brake transaxle of the present invention in a braking state (no wear on the friction plates);

FIG. 8 is a schematic view of a brake release state of the wet brake transaxle of the present invention (wear of the friction plates);

fig. 9 is a schematic view showing a braking state of the wet brake transaxle of the present invention (the friction plates are worn).

Description of reference numerals: 1. an axle housing; 11. a first housing; 12. a second housing; 13. a third housing; 2. an input assembly; 3. a first half shaft; 4. a first brake assembly; 5. a first hub assembly; 6. a second half shaft; 7. a second brake assembly; 8. a second hub assembly; 20. a differential base; 201. a first mounting hole; 21. a differential mechanism; 22. a power input shaft; 221. a first bevel gear; 23. an input flange; 24. a brake flange; 25. a dust ring; 26. a first nut; 27. a spacer sleeve; 28. a first oil seal; 29. a first bearing; 41. an inner friction plate; 42. an outer friction plate; 43. an annular piston; 44. a return spring seat; 45. a return spring screw; 46. a return spring; 47. a first gap; 48. a second gap; 49. a third gap; 432. a second mounting hole; 433. a first ring groove; 434. a second ring groove; 451. a first flange; 71. a mandrel; 72. a pressure bearing plate; 73. a first retainer ring; 74. a second retainer ring; 75. an oil chamber; 9. a second planetary gear; 211. a differential housing; 212. a first planetary gear; 213. a second side gear; 214. a first half-shaft gear; 215. a second bevel gear; 111. a parking brake bracket; 112. a parking brake; 113. a speed sensor; 114. an oil level port; 115. an oil filler; 116. an oil discharge port; 121. an air release port; 122. a first mounting surface.

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 specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; 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.

A wet brake transaxle as shown in fig. 1 and 2, including axle housing 1, input assembly 2, first wheel hub subassembly 5 and second wheel hub subassembly 8, second wheel hub subassembly 8 is the same with first wheel hub subassembly 5 structure, axle housing 1 includes first casing 11, second casing 12 and

third casing

13, 11 interlude of first casing are cylindric its both ends and are loudspeaker form opening, first casing 11 is the same with third casing 13 structure to hexagonal screw through round evenly distributed fixes at 11 both ends of first casing, input assembly 2 is fixed on first casing 11 through round evenly distributed's hexagonal screw, and first wheel hub subassembly 5 is installed on second casing 12, and second wheel hub subassembly is installed on third casing 13.

The upper parts of the two ends of the first shell 11 are provided with air release ports 121, the air release ports 121 are located in the conical area of the bell mouth, the air release ports 121 only need to be opened to remove air in the oil chamber 75 when pressure oil is added to the wet brake driving axle at the beginning, and the air release ports 121 need to be blocked by air release screws at other times to achieve the sealing effect.

The front end of the first housing 11 is further provided with a parking brake bracket 111 fixed by screws, and a parking brake 112 is mounted on the parking brake bracket 111, and the parking brake 112 controls the parking brake bracket to clamp the brake flange 24 so that the brake flange 24 cannot rotate.

A speed sensor 113 for monitoring the real-time rotation speed of the second bevel gear 215 of the input assembly 2 is installed at a middle position of the upper portion of the first housing 11; in this embodiment, the second bevel gear 215 is preferably a spiral bevel gear.

An oil level port 114 is provided at the rear end of the first casing 11, and the center of the oil level port 114 is located on the same horizontal plane as that of fig. 3, so that the details of the lubricating oil in the first casing 11 can be easily observed.

An oil filler 115 is provided on the upper right side of the first housing 11 and is normally sealed by a plug screw and an O-ring seal.

An oil drain 116 is provided on the lower left side of the first housing 11, and is normally sealed by a magnetic oil drain bolt and an O-ring.

As shown in fig. 3, the drive axle comprises an axle housing 1, an input assembly 2, a first axle shaft 3, a first brake assembly 4, a first hub component 5, a second axle shaft 6, a second brake assembly 7 and a second hub component 8, wherein the axle housing 1 comprises a second shell 12, a first shell 11 and a third shell 13, the middle section of the first shell 11 is cylindrical, two ends of the first shell are horn-shaped openings, the first brake assembly 4 and the second brake assembly 7 have the same structure, the first hub component 5 and the second hub component 8 have the same structure, the input assembly 2 is installed on the first shell 11, the first brake assembly 4 is located at the left half section of the first shell 11, the first hub component 5 is installed on the second shell 12, the second shell 12 is fixed at the left end of the first shell 11 through a circle of uniformly distributed hexagonal screws, the right section of the first axle shaft 3 is connected with the input assembly 2, first semi-axis 3 passes through first brake assembly 4 and links to each other with first wheel hub subassembly 5, second brake assembly 7 is located first casing 11 half section on the right side, and second wheel hub subassembly 8 is installed on third casing 13, and third casing 13 is fixed at first casing 11 right-hand member through round evenly distributed's hexagon screw, second semi-axis 6 left segment is connected with input assembly 2, second semi-axis 6 passes through second brake assembly 7 and is connected with second wheel hub subassembly 8.

The input assembly 2 shown in fig. 4 includes a differential carrier 20, and a differential 21, a power input shaft 22, a first bevel gear 221, an input flange 23 and a brake flange 24 mounted on the differential carrier 20, the differential carrier 20 being fixed to the first housing 11 by a circle of uniformly distributed hexagonal screws, the power input shaft 22 and the first bevel gear 221 being integrally formed, the first bevel gear 221 preferably being a threaded bevel pinion, the differential 21 including a differential housing 211, a first planetary gear 212, a second side gear 213 and a first side gear 214, the differential housing 211 being mounted on the differential carrier 20 and being rotatable on the differential carrier 20, a tapered roller bearing and a second nut being provided between the differential housing 211 and the differential carrier 20, the tapered roller bearing being fitted over the differential housing 211 and being in interference fit with the differential carrier 20 and the differential housing 211 for ensuring smooth rotation of the differential housing 211, the second nut is installed between the tapered roller bearing and the differential carrier 20, the differential carrier 211 is fixed with a second bevel gear 215, the second bevel gear 215 is preferably a spiral bevel gear wheel, the second bevel gear 215 is engaged with a first bevel gear 221, the first planetary gear 212 is rotationally fixed inside the differential carrier 211, a first half shaft gear 214 and a second half shaft gear 213 are respectively located at the left side and the right side inside the differential carrier 211, the first half shaft gear 214 and the second half shaft gear 213 are both engaged with the first planetary gear 212, the first half shaft 3 and the second half shaft 6 penetrate through the differential carrier 211 and are respectively inserted and fixed on the first half shaft gear 214 and the second half shaft gear 213, the brake flange 24 is provided with a first central hole, a half section of the first central hole is in transmission fit with the power input shaft 22 through a spline, and a dust ring 25 is further provided, the dust ring 25 is located at the port of the first central hole and is sleeved on the input flange 23, the outer half section of the first central hole is in transmission fit with the outer wall of the input flange 23 through a spline, the input flange 23 can axially float on the first central hole, compared with the existing transmission shaft which is additionally provided, only one input flange 23 which is coaxial with the power input shaft 22 and can axially float relative to the brake flange 24 is added, the vibration between the input assembly 2 and the transmission is only transmitted to the input flange 23, the vibration can be counteracted through the axial float of the input flange 23, the independence of the input assembly 2 and the transmission is increased, the structure is more compact and reasonable, the volume is small, the space utilization rate is high, and the forklift is more suitable for forklift installation.

In another embodiment of the scheme, a second central hole is formed in the input flange, the second central hole is in transmission fit with the outer wall of the braking flange through a spline, the input flange can axially float on the outer wall of the braking flange, and the dust ring is located at the port of the second central hole and is sleeved on the braking flange; in this embodiment, the first central hole may be a through hole or a blind hole, and in this embodiment, the first central hole is preferably a through hole.

Specifically, the first central hole of the braking flange 24 is a stepped hole, the inner half section of the first central hole has a smaller aperture than the outer half section of the first central hole, a first nut 26 is connected to one end of the power input shaft 22 extending into the first central hole of the braking flange 24 through a thread, and the first nut 26 is fixed against the step in the first central hole of the braking flange 24.

Specifically, a dust ring 25 is arranged between the input flange 23 and the braking flange 24, and the dust ring 25 is sleeved on the input flange 23 and is located at an outer port of the first central hole of the braking flange 24.

Specifically, a first mounting hole 201 is formed in the differential base 20, the power input shaft 22 and the brake flange 24 are mounted in the first mounting hole 201, a seal ring, a spacer 27 and two first bearings 29 are sleeved on the power input shaft 22, the first bearings 29 are preferably tapered roller bearings, the seal ring is preferably an O-shaped seal ring, the two first bearings 29 are in interference fit with the first mounting hole 201 and the power input shaft 22, the spacer 27 is located between the two first bearings 29, the seal ring is tightly attached to the first nut 26, and an adjusting gasket is further arranged between the spacer 27 and the first bearing 29 located at the outer end.

The power input shaft 22 and the brake flange 24 can smoothly rotate on the differential carrier 20 through the above arrangement.

Specifically, still be equipped with first oil blanket 28, the preferred skeleton oil blanket of first oil blanket 28, first oil blanket 28 is located first mounting hole 201 outside port department and overlaps on braking flange 24, first oil blanket 28 and first mounting hole 201 and braking flange 24 interference fit to ensure the leakproofness of first mounting hole 201.

In the above structure, the power is transmitted from the output shaft flange of the gearbox to the input flange 23 of the drive axle, the input flange 23 is in transmission fit with the brake flange 24 through splines so as to transmit the power to the brake flange 24, the brake flange 24 is in transmission fit with the power input shaft 22 through the splines so as to transmit the power to the power input shaft 22 and the first bevel gear 221, the first bevel gear 221 and the second bevel gear 215 are in mesh transmission so as to transmit the power to the second bevel gear 215 and the differential case, the power is transmitted to the second side gear 213 and the first side gear 214 through the first planetary gear 212 on the differential, the power is transmitted to the first half shaft 3 through the first side gear 214, and the power is transmitted to the second half shaft 6 through the second side gear 213.

The first brake assembly 4 shown in fig. 5 comprises an inner friction plate 41, a bearing plate (72), an outer friction plate 42, an annular piston 43, a return spring 46 and a return spring screw 45 which are positioned in the left half section of the first shell 11, wherein the bearing plate 72, the outer friction plate 42 are in circumferential positioning axial movable fit with the first shell 11, the inner friction plate 41 is in circumferential positioning axial movable fit with the first half shaft 3, a plurality of annular inner friction plates 41 and outer friction plates 42 are alternately overlapped with each other, the annular piston 43 moves between a braking position and a non-braking position, the return spring 46 enables the annular piston 43 to move from the braking position to the non-braking position, a return spring seat 44 is further arranged, a plurality of second mounting holes are uniformly distributed on the side surface of the annular piston 43, the return spring seat 44 is arranged in the second mounting holes in an interference fit manner, the return spring screw 45 penetrates through the return spring seat 44 and is arranged on, the return spring 46 is fitted over the return spring screw 45, and the return spring 46 abuts on the return spring seat 44 at one end and on the return spring screw 45 at the other end.

The outer surface of the return spring seat 44 is a cylindrical surface and is in interference fit with the second mounting hole 432, and it should be noted that the outer surface of the return spring seat 44 may also be in other shapes, such as a prism, a cuboid, etc., and the corresponding second mounting hole 432 is in interference fit with the outer surface of the return spring seat 44, specifically, the return spring seat 44 and the annular piston 43 may be mutually driven to move, and when the inner friction plate 41 and the outer friction plate 42 are worn, the return spring screw 45 limits the stroke of the return spring seat 44 to be the first gap 47, the annular piston 43 and the outer friction plate 42 still have a gap, and the annular piston 43 may still axially move under the action of oil pressure until the end surface abuts against the outer friction plate 42.

Specifically, a side of the annular piston 43 can be abutted against the outer friction plate 42, another side of the annular piston 43 can be abutted against the first housing 11, a first annular groove 433 and a second annular groove 434 are arranged on the circumferential side wall of the annular piston 43, and a first sealing ring and a second sealing ring are respectively arranged in the first annular groove 433 and the second annular groove 434.

Specifically, the return spring screw 45 is provided with a first flange 451, one end of the return spring 46 abuts against the first flange 451, the other end abuts against the return spring seat 44, the distance between the first flange 451 and the return spring seat 44 is a first clearance 47, when the annular piston 43 moves from the non-braking position to the braking position against the outer friction plate 42, the first flange 451 may abut the return spring seat 44, thereby limiting the travel of the return spring seat 44 to the first clearance 47, in this embodiment, the first flange 451 may have a disk shape or other shapes, so long as when the annular piston 43 moves from the non-braking position to the braking position against the outer friction plate 42, the first flange 451 abuts against the return spring seat 44, in this embodiment, the first flange 451 is preferably disc-shaped with a disc diameter larger than the inner diameter of the spring seat so as to abut against the return spring seat 44.

Specifically, the bearing plate 72 is circular ring shaped, the bearing plate 72 is coaxial with the inner friction plate 41 and the outer friction plate 42 and supports against the outer friction plate 42, the bearing plate 72 and the annular piston 43 are respectively located at different sides of the inner friction plate 41 and the outer friction plate 42, the bearing plate 72 is sleeved on the first half shaft 3, the bearing plate 72 and the annular piston 43 are respectively located at different sides of the inner friction plate 41 and the outer friction plate 42, the mandrel 71 and the outer friction plate 42 are circumferentially and uniformly distributed with a plurality of fourth mounting holes, and the mandrel 71 passes through the fourth mounting holes and fixes the bearing plate 72 in the second housing 12.

Specifically, a first retaining ring 73 and a second retaining ring 74 are further provided, the first retaining ring 73 and the second retaining ring 74 are sleeved on the first half shaft 3, the first retaining ring 73 and the second retaining ring 74 are sleeved on the inner friction plate 41 coaxially and are located on two sides of the inner friction plate 41 and the outer friction plate 42, and therefore a limiting effect is achieved on the friction plates, and the axial movement range of the inner friction plate 41 and the outer friction plate 42 is prevented.

Specifically, there are three second planetary gears 9, each of the three second planetary gears 9 is circumferentially and uniformly wound around the first half shaft 3 and is located between the pressure bearing plate 72 and the first hub component 5, and gears at two ends of the second planetary gears 9 are in transmission fit with the first half shaft 3 and the first hub component 5 respectively.

The second brake assembly 7 has the same structure as the first brake assembly 4, and includes the above structure.

In the above structure of the present invention, in the state of brake release, the first half shaft 3 transmits power to the second planetary gear 9 by cooperating with the second planetary gear 9, and the second planetary gear 9 transmits power to the first hub assembly 5 by cooperating with the first hub assembly 5, so that the external appearance is left wheel rotation, and the power transmission condition for the right half part of the drive axle is the same as that for the left half part;

in the braking state in which the annular piston 43 abuts against the outer friction plate 42, the inner friction plate 41 and the outer friction plate 42 cannot rotate freely any more under the action of friction force, and the resistance force is transmitted to the first half shaft 3, the second planetary gear 9 and the first hub assembly 5, so that the rotation speed of the left wheel is reduced or stopped, and the transmission condition of the resistance force for the right half part of the drive axle is the same as that for the left half part.

As shown in fig. 6, in a state where the friction plate of the wet brake transaxle of the present invention is not worn, and in this embodiment, for convenience of confirmation, the end surface of the smaller diameter side of the annular piston 43 is abutted against one mounting surface in the first housing 11, the name of the mounting surface in the second housing 12 is referred to as the first mounting surface 122, the return spring seat 44 is in interference fit with the second mounting hole 432 in the annular piston 43, and the end surface of the return spring seat 44 is abutted against the first mounting surface 122, and in this state, the distance between the first flange 451 on the return spring screw 45 and the return spring seat 44 is the first gap 47.

Pressure oil enters the oil chamber 75, and the annular piston 43 carries the return spring seat 44 from the non-braking position, in which the outer friction plate 42 is separated, to the braking position, in which it abuts against the outer friction plate 42, until the annular piston 43 reaches the braking point against the outer friction plate 42, that is, as shown in fig. 7, the wet brake transaxle friction plate of the present invention is in a non-abrasion braking state, and in this state, the end surface of the annular piston 43 on the side with the larger diameter abuts against the outer friction plate 42, and the end surface on the side with the smaller diameter is still flush with the end surface of the return spring seat 44, and the end surface of the other end of the return spring seat 44 abuts on the first flange 451 on the return spring screw 45, and in this state, the distance between the return spring seat 44 and the first mounting surface 122 is the first clearance 47, and the distance between the end surface of the annular piston 43 on the side with the smaller diameter and the first mounting surface 122 is also the first clearance 47, that is, the displacements of both the return spring seat 44 and the annular piston 43 are the first clearance 47.

When the inner friction plate 41 and the outer friction plate 42 are worn, the return spring screw 45 limits the stroke of the return spring seat 44 to be a first gap 47, and the annular piston 43 can still axially move until the end surface abuts against the outer friction plate 42, that is, as shown in fig. 9, when the inner friction plate 41 and the outer friction plate 42 of the wet brake drive axle of the invention are worn, when the annular piston 43 reaches the braking position abutting against the outer friction plate 42, the end surface of the smaller diameter side of the annular piston 43 is not flush with the end surface of the return spring seat 44, the end surface of the return spring seat 44 protrudes a part relative to the end surface of the smaller diameter side of the annular piston 43, and the other end surface of the return spring seat 44 abuts against the first flange 451 on the return spring screw 45, in this state, the distance between the return spring seat 44 and the first mounting surface 122 is a first gap 47, and the distance between the end surface of the smaller diameter side of the annular piston 43 and the first mounting, the second gap 48 is larger than the first gap 47.

Pressure oil is discharged in the oil chamber 75, the return spring seat 44 moves away from the inner friction plate 41 and the outer friction plate 42 under the action of the return spring 46, and the annular piston 43 is driven to move together until a non-braking state shown in fig. 8 is reached, in the process, the return spring seat 44 and the annular piston 43 both move to form a first gap 47, so that a third gap 49 exists between the end surface of the annular piston 43 on the side with the smaller diameter and the first mounting surface 122, the sum of the third gap 49 and the first gap 47 is a second gap 48, the end surface of the return spring seat 44 protrudes a part relative to the end surface of the annular piston 43 on the side with the smaller diameter, and the end surface of the return spring seat 44 abuts against the first mounting surface 122, and in the state, the distance between the first flange 451 on the return spring screw 45 and the return spring seat 44 is the first gap 47.

It should be noted that, in the process that the annular piston 43 reaches the non-braking position separated from the outer friction plate 42 from the braking point abutting against the outer friction plate 42, no matter whether the inner friction plate 41 and the outer friction plate 42 are worn or not, the return spring seat 44 drives the annular piston 43 to move together in the direction away from the inner friction plate 41 and the outer friction plate 42, the moving distance is always the first gap 47 under the limit of the first flange 451 and the first mounting surface 122, that is, the return distance of the annular piston 43 is always the first gap 47, that is, when the annular piston 43 reaches the braking position where the annular piston 43 abuts against the outer friction plate 42 from the non-braking position separated from the outer friction plate 42, the displacement required by the annular piston 43 is always the first gap 47, so as to achieve the purpose of compensating the abrasion of the inner friction plate 41 and the outer friction plate 42, and enable the brake assembly to be used, the braking distance is kept constant all the time, the braking effect is guaranteed, the inner friction plate 41 and the outer friction plate 42 are durable, and the maintenance cost of the inner friction plate 41 and the outer friction plate 42 is reduced.

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

1. A wet brake drive axle comprises an axle housing (1), an input assembly (2), a first brake assembly (4), a first half shaft (3), a first wheel hub component (5), a second half shaft (6), a second brake assembly (7) and a second wheel hub component (8), wherein the second brake assembly (7) is identical to the first brake assembly (4), the axle housing (1) comprises a first shell (11), a second shell (12) and a third shell (13), the first brake assembly (4) is identical to the second brake assembly (7), the first wheel hub component (5) is identical to the second wheel hub component (8), the input assembly (2) is installed on the first shell (11), the first brake assembly (4) is located at the left half section of the first shell (11), the first wheel hub component (5) is installed on the second shell (12), the second shell (12) is fixed at the left end of the first shell (11), the right section of the first half shaft (3) is connected with the input assembly (2), the first half shaft (3) is connected with the first hub component (5) through the first brake assembly (4), the second brake assembly (7) is located at the right section of the first shell (11), the second hub component (8) is installed on the third shell (13), the third shell (13) is fixed at the right end of the first shell (11), the left section of the second half shaft (6) is connected with the input assembly (2), and the second half shaft (6) is connected with the second hub component (8) through the second brake assembly (7);

the input assembly (2) comprises a differential seat (20), a differential (21), a power input shaft (22) and an input flange (23), wherein the differential (21), the power input shaft (20) and the input flange (23) are arranged on the differential seat (20), a first bevel gear (221) is integrally formed on the power input shaft (22), the differential (21) comprises a differential shell (211), a first planetary gear (212), a second side gear (213) and a first side gear (214), the differential shell (211) is arranged on the differential seat (20) and can rotate on the differential seat (20), the differential shell (211) is fixedly provided with the second bevel gear (215), the second bevel gear (215) is mutually meshed with the first bevel gear (221), the first planetary gear (212) is rotatably arranged in the differential shell (211), and the first side gear (214) and the second side gear (213) are respectively arranged at the left side and the right side in the differential shell (211), the first half shaft gear (214) and the second half shaft gear (213) are meshed with the first planetary gear (212), the input flange (23) is connected with the power input shaft (22) in a matched mode, the first half shaft (3) penetrates through the differential shell (211) and is fixedly connected with the first half shaft gear (214) in an inserted mode, and the second half shaft (6) penetrates through the differential shell (211) and is fixedly connected with the second half shaft gear (213) in an inserted mode;

it is characterized in that the preparation method is characterized in that,

the first brake assembly (4) comprises an inner friction plate (41), a bearing plate (72), an outer friction plate (42), an annular piston (43), a return spring (46), a return spring seat (44) and a return spring screw (45) which are positioned in a first shell (11), wherein the bearing plate (72), the outer friction plate (42) and the first shell (11) are in circumferential positioning axial movable fit, the inner friction plate (41) and a first half shaft (3) are in circumferential positioning axial movable fit, the annular inner friction plate (41) and the outer friction plate (42) are alternately overlapped, the annular piston (43) moves between a braking position and a non-braking position, the return spring (46) enables the annular piston (43) to move from the braking position to the non-braking position, a plurality of second mounting holes are uniformly distributed in the side face of the annular piston (43), and the return spring seat (44) is mounted in the second mounting holes in an interference fit manner, a return spring screw (45) penetrates through the return spring seat (44) and is mounted on the first housing (11), a return spring (46) is sleeved on the return spring screw (45), one end of the return spring (46) abuts against the return spring seat (44), and the other end of the return spring (46) abuts against the return spring screw (45).

2. A wet brake axle according to claim 1, further comprising a brake flange (24), wherein the input flange (23) is in driving engagement with the brake flange (24), and wherein the brake flange (24) is in driving engagement with the power input shaft (22).

3. A wet brake transaxle of claim 2 wherein the brake flange (24) is splined to the power input shaft (22) and secured thereto by fasteners, the input flange (23) is splined to the brake flange (24) and the input flange (23) is axially shiftable on the brake flange (24).

4. A wet brake axle according to claim 3 wherein the brake flange (24) is provided with a first central aperture, the inner half of which is splined to the power input shaft (22) and the outer half of which is splined to the outer wall of the input flange (23).

5. A wet brake transaxle of claim 4 wherein a dust ring (25) is disposed between the input flange (23) and the brake flange (24), the dust ring (25) being disposed over the input flange (23) and located at an outer end of the first central opening of the brake flange (24).

6. A wet brake axle according to claim 4, wherein the first central hole of the brake flange (24) is a stepped hole, the inner half of the first central hole has a smaller diameter than the outer half of the first central hole, a first nut (26) is screwed on the end of the power input shaft (22) extending into the first central hole of the brake flange (24), and the first nut (26) is fixed against the step in the first central hole of the brake flange (24).

7. A wet brake transaxle of claim 1 wherein the return spring screw (45) limits travel of the return spring seat (44) to a first clearance (47), the annular piston (43) and the return spring seat (44) move together in an interference fit, and when the inner (41) and outer (42) friction plates are in an unworn condition, a displacement travel between a braking position and a non-braking position of the annular piston (43) is no greater than the first clearance (47); when the inner friction plate (41) and the outer friction plate (42) are worn, the annular piston (43) and the return spring seat (44) are still fixed in an interference fit manner after relative displacement is generated, and the displacement stroke between the braking position and the non-braking position of the annular piston (43) is a first clearance (47).

8. A wet brake transaxle of claim 7 wherein the return spring bolt (45) is provided with a first flange (451), the central opening of the return spring seat (44) is a stepped opening, and the return spring (46) has one end abutting against the first flange (451) of the return spring bolt (45) and the other end abutting against the step of the central opening of the return spring seat (44).

9. A wet brake transaxle of claim 8 wherein the first flange (451) is spaced from the return spring seat (44) by a first clearance gap (47), the first flange (451) being adapted to abut the return spring seat (44) when the annular piston (43) moves from the non-braking position to the braking position, thereby limiting travel of the return spring seat (44) to the first clearance gap (47).

10. A wet brake transaxle according to claim 1 wherein there are further provided a first retaining ring (73) and a second retaining ring (74), said first retaining ring (73) and said second retaining ring (74) being fitted over the first axle shaft (3) and being coaxial with the inner friction plate (41), said first retaining ring (73) and said second retaining ring (74) being located on opposite sides of the inner friction plate (41) so as to limit the axial play range of the inner friction plate (41).