CN110043583A

CN110043583A - Drive axle and its brake assembly

Info

Publication number: CN110043583A
Application number: CN201910348818.5A
Authority: CN
Inventors: 金刚强
Original assignee: Zhejiang Golden Road Polytron Technologies Inc
Current assignee: Zhejiang Golden Road Polytron Technologies Inc
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2019-07-23

Abstract

The invention discloses a kind of drive axle and its brake assemblies, it further include axle housing, input assembly, first semiaxis, first wheel component, second semiaxis, second brake assembly and the second hub unit, the second brake assembly is identical as brake assembly structure, the input assembly is mounted on axle housing, first brake assembly is located at axle housing left end, right section of first semiaxis is connected with input assembly, first semiaxis passes through the first brake assembly, the second brake assembly is located at axle housing right end, left section of second semiaxis connect with input assembly, second semiaxis passes through second brake assembly；First brake assembly and second brake assembly can compensate the abrasion of friction plate, to improve the service life of friction plate, the input assembly can effectively mitigate drive axle vibration to influence caused by speed changer, extend the service life of drive axle equipped with buffer gear.

Description

Drive axle and its brake assembly

Technical field

The present invention relates to automobile technical field more particularly to a kind of drive axles and its brake assembly.

Background technique

It is well known that the applying working condition of engineering machinery is comparatively relatively more severe, currently, domestic project machinery vehicle bridge product Market is still based on dry type braking drive axle, while dry type drive axle uses external dry brake, this results in dry type driving Bridge is larger by such environmental effects such as humidity, frost, sand and dust, and braking ability is unstable, and service life is shorter；Wet brake is Built-in, substantially not by such environmental effects, long service life, brake safe are reliable, have in existing engineering machinery extensive Using.

And in the prior art, wet-type braking driving axle, which is applied in fork truck early, precedent, such as Publication No. The Chinese patent literature of CN107265354A discloses a kind of integrated wet-type braking driving axle of fork truck driving parking, including input is always At, axle housing, the first semiaxis, the second semiaxis, spline housing and fixed gear ring, and the first brake assembly in axle housing and Two brake assemblies, the not side of insensitivity difference and maintenance brought by the original dry type braking of the patent effective solution Just the problems such as, in the patent document, maintenance replacement can be carried out to friction plate and partition by not needing to tear axle housing open, but can not be kept away What is exempted from is friction plate in use because abrasion causes friction plate thinning, so that the brake force of brake is reduced, and in order to Guarantee traveling safety, often friction disc wear to a certain extent when, just no longer have value, to cause friction plate Maintenance cost it is high, service life is low.

In addition, the power of existing wet-type braking driving axle is often provided by speed changer, therefore by wheel hub on drive axle The vibration transmitted just is easy to be transferred to speed changer, and when gearbox body is by the vibration, the vibration of automobile will be caused And different degrees of noise is generated, while the vibration of gearbox body is also easy to will cause the damage of speed changer inner body, because It will pass through to be arranged between transmission input shaft and drive axle in the Chinese patent literature that the displosure number is CN109185420A and pass Moving axis avoids speed changer from being connected directly with drive axle with this, but this measure reduces the efficiency of speed changer, also increases wet braking The volume and cost of drive axle.

Summary of the invention

The first purpose of this invention is to provide a kind of brake assembly for above-mentioned friction disc wear problem, be somebody's turn to do The piston of brake can automatically adjust the gap with friction plate according to the abrasion condition of friction plate, enable the brake force of brake It is maintained in normal level for a long time.

Second object of the present invention is to provide for the vibration problem of transmission between above-mentioned speed changer and drive axle A kind of input assembly, input assembly are equipped with buffer gear, can effectively mitigate drive axle and vibrate to influence caused by speed changer, Extend the service life of drive axle, and high compared to existing buffer gear space utilization rate small in size, is more suitable for fork truck installation.

In order to reach first above-mentioned purpose, present invention employs technical solutions below:

A kind of brake assembly, including be located at the intracorporal inner attrition piece of first shell, outside friction disc, bearing plate, annular piston, Return spring, return spring seat and return spring screw, bearing plate, outside friction disc and the circumferentially positioned axial activity of first shell are matched It closes, inner attrition piece and the circumferentially positioned axial activity of the first semiaxis cooperate, and the inner attrition piece and outside friction disc of multiple annulars are handed over each other For being stacked, annular piston moves between application position and non-braking position, and return spring moves annular piston from application position It moves to non-braking position, several second mounting holes, return spring seat interference fit is evenly distributed on the annular piston side It is mounted in the second mounting hole, return spring screw passes through return spring seat and installs on the first shell, and return spring covers On return spring screw, and return spring one end is against on return spring seat, and the other end is against on return spring screw.

The stroke that return spring screw limits return spring seat is the first gap, and annular piston and return spring seat interference are matched Same movement is amounted to, when inner attrition piece and outside friction disc are in non-state of wear, the application position of annular piston and non-brake position Displacement stroke between setting is not more than the first gap；When inner attrition piece and outside friction disc generate abrasion, annular piston and return It is still interference fitted fixation after generating relative displacement between spring base, the stroke that return spring screw limits return spring seat is first Gap, so that the displacement stroke between the application position and non-braking position of annular piston is the first gap.

Preferably, the return spring screw is equipped with the first flange, the centre bore of return spring seat is stepped hole, is returned It returns spring one end to be against on the first flange of return spring screw, the other end is against on the centre bore step of return spring seat.

Preferably, the distance between first flange and return spring seat are the first gap, when annular piston is from non- When application position is moved to application position, the first flange can resist return spring seat, so that the stroke for limiting return spring seat is First gap.

Preferably, the distance between first flange and return spring seat are the first gap, when annular piston is from non- When application position is moved to against the application position of outside friction disc, the first flange can resist return spring seat, to limit return The stroke of spring base is the first gap.

Preferably, the one side of the annular piston can offset with outside friction disc, the other side of the annular piston Face can offset with first shell, annular piston circumferential side wall be equipped with the first annular groove and the second annular groove, first annular groove and The first sealing ring and the second sealing ring are respectively equipped in second annular groove.

Preferably, bearing plate is annular shape, bearing plate is coaxial with inner attrition piece and outside friction disc and resists outside friction disc, The bearing plate and annular piston are located at the not ipsilateral of inner attrition piece and outside friction disc.

Preferably, be additionally provided with mandrel, the mandrel and the circumferentially positioned cooperation of outside friction disc, on the bearing plate circumferentially Several 4th mounting holes are evenly distributed with, the mandrel passes through the 4th mounting hole and bearing plate is fixed in first shell.

Preferably, being additionally provided with the first retaining ring and the second retaining ring, first retaining ring and the second shield ring sleeve are in the first semiaxis Upper and coaxial with inner attrition piece, first retaining ring and the second retaining ring are located at inner attrition piece two sides, to limit inner attrition piece Axial float range.

The present invention is due to the technical solution more than using, and on the basis of existing technology, there is following optimization:

In view of abrasion condition of the friction plate in routine use, it is additionally arranged collocation structure in brake assembly, that is, returns Be interference fitted between rebound spring abutment and annular piston, in braking process, annular piston drive return spring seat to inner attrition piece and Outside friction disc direction is mobile, when reaching piston against the braking point of outside friction disc, the movement of annular piston and return spring seat away from From for the first gap, this is inner attrition piece and outside friction disc without abrasion condition, and there is mill for inner attrition piece and outside friction disc When damage, annular piston drives return spring seat mobile to friction plate direction, when reaching braking point, the move distance of return spring seat For the first gap, and the move distance of annular piston is the wear-thickness that the first gap adds friction plate, and is releasing braking It in the process, is to drive annular piston mobile toward separate friction plate direction from return spring seat, the move distance of return spring seat is First gap, so that the move distance of annular piston is also the first gap, to reach the mesh compensated to friction disc wear , so that brake assembly is in use, braking distance remains constant, ensure that braking effect, but also friction Piece is more durable, reduces the maintenance cost of friction plate.

In order to reach second above-mentioned purpose, present invention employs technical solutions below:

A kind of input assembly, including differential mechanism seat and the differential mechanism being mounted on differential mechanism seat, power input shaft, input Flange and braking flange, are integrally formed the first bevel gear on the power input shaft, and the differential mechanism includes differential casing, the One planetary gear, the second axle shaft gear and the first axle shaft gear, differential casing are mounted on differential mechanism seat and can be in differential mechanisms It is rotated on seat, the second bevel gear is fixed on differential casing, the second bevel gear and the first bevel gear are intermeshed, the first planet Gear is rotatably arranged on inside differential casing, and the first axle shaft gear and the second axle shaft gear are located inside differential casing The left and right sides, and the first axle shaft gear and the second axle shaft gear are engaged with first planetary gear, and the first semiaxis runs through differential Device shell is simultaneously plugged and fixed with the first axle shaft gear, and the second semiaxis is through differential casing and solid with the second axle shaft gear grafting It is fixed；The improvement made compared with the existing technology is that the braking flange is fastened by spline and power input shaft with merga pass Part is fixed, the input flange and braking flange by spline drived cooperate, input flange can brake flange on axial float.

Preferably, the braking flange is equipped with the first centre bore, interior half section of the first centre bore is inputted with power The splined hole of axis cooperation, outer half section of the first centre bore are the splined holes with the cooperation of input flange outer wall.

Preferably, being equipped with dustband between input flange and braking flange, the dustband is set on input flange And it is located at the external port of the first centre bore of braking flange.

Preferably, the first centre bore of the braking flange is stepped hole, the interior half hole diameter of the first centre bore is less than Its outer half hole diameter, the power input shaft protrude into braking flange the first centre bore in one end on be threaded with the first spiral shell Step in first centre bore of mother, first nut and braking flange offsets fixation.

Preferably, the differential mechanism seat is equipped with the first mounting hole, the power input shaft and braking flange are mounted on On first mounting hole, be cased with sealing ring, spacer and two first bearings on the power input shaft, described two first bearings with First mounting hole and power input shaft cooperation, the spacer are located between two first bearings, and the sealing ring is close to the first spiral shell It is female.

Preferably, being additionally provided with the first oil sealing, first oil sealing is located at the first mounting hole port and covers in deceleration method Lan Shang, first oil sealing and the first mounting hole and braking flange interference fit.

Preferably, being additionally provided with parking brake, the parking brake is mounted on differential mechanism seat by fastener, institute State parking brake can clamp braking flange so that it is stopped operating.

Input flange and braking flange are added between gearbox and input assembly, add a biography again relative to existing Moving axis is compared, increase only one it is coaxial with power input shaft and can relative to braking flange axial float input flange, The vibration inputted between assembly and speed changer in this way is only transferred to input flange, can be offset by the axial float of input flange Vibration, so that the independence of input assembly and speed changer increases, and structure is more compact and reasonable, space utilization rate small in size Height is more suitable for fork truck installation.

The present invention also provides a kind of drive axles, including above-described brake assembly and input assembly.

Preferably, further including axle housing, the first semiaxis, first wheel component, the second semiaxis, second brake assembly and Two hub units, the second brake assembly is identical as brake assembly structure, and the axle housing includes second shell, first shell Body and third shell, it is flare openings that the first shell interlude, which is its cylindric both ends, the first brake assembly and the Two brake assembly structures are identical, and first wheel component and the second hub unit structure are identical, and the input assembly is mounted on On one shell, first brake assembly is located at half section of a first shell left side, and first wheel component is installed on the second housing, the Two shells are fixed on first shell left end, and right section of first semiaxis is connected with input assembly, and first semiaxis passes through first Brake assembly is simultaneously connected with first wheel component, and the second brake assembly is located at half section of the first shell right side, the second wheel hub Component is mounted on third shell, and third shell is fixed on first shell right end, and left section of second semiaxis connects with input assembly It connects, second semiaxis passes through second brake assembly and connect with the second hub unit.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of drive axle of the present invention；

Fig. 2 is the top view of Fig. 1；

Fig. 3 is the A-A cross-sectional view of Fig. 1；

Fig. 4 is partial enlarged view at the O of Fig. 3 of drive axle of the present invention；

Fig. 5 is partial enlarged view at the P of Fig. 3 of drive axle of the present invention；

Fig. 6 is the brake release status diagram of drive axle of the present invention (friction plate is without abrasion)；

Fig. 7 is the on-position schematic diagram of drive axle of the present invention (friction plate is without abrasion)；

Fig. 8 is the brake release status diagram of drive axle of the present invention (friction plate has abrasion)；

Fig. 9 is the on-position schematic diagram of drive axle of the present invention (friction plate has abrasion).

Description of symbols: 1, axle housing；11, first shell；12, second shell；13, third shell；2, assembly is inputted；3, First semiaxis；4, the first brake assembly；5, first wheel component；6, the second semiaxis；7, second brake assembly；8, the second wheel Hub assembly；20, differential mechanism seat；201, the first mounting hole；21, differential mechanism；22, power input shaft；221, the first bevel gear；23, Input flange；24, flange is braked；25, dustband；26, the first nut；27, spacer；28, the first oil sealing；29, first bearing； 41, inner attrition piece；42, outside friction disc；43, annular piston；44, return spring seat；45, return spring screw；46, bullet is returned Spring；47, the first gap；48, the second gap；49, third space；432, the second mounting hole；433, the first annular groove；434, the second ring Slot；451, the first flange；71, mandrel；72, bearing plate；73, the first retaining ring；74, the second retaining ring；75, oil pocket；9, the second planet Gear；211, differential casing；212, first planetary gear；213, the second axle shaft gear；214, the first axle shaft gear；215, Two bevel gears；111, parking brake bracket；112, parking brake；113, velocity sensor；114, oil level mouth；115, it refuels Mouthful；116, fuel outlet；121, gas vent；122, the first mounting surface.

Specific embodiment

The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.

In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", " clockwise ", " inverse The orientation or positional relationship of the instructions such as hour hands " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description originally Invention and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific side Position construction and operation, therefore be not considered as limiting the invention.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two It is a or more than two, unless otherwise restricted clearly.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc. Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be Concrete meaning in bright.

In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower" It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above " Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of First feature horizontal height is less than second feature.

A kind of drive axle as depicted in figs. 1 and 2, including axle housing 1, input assembly 2, first wheel component 5 and the second wheel Hub assembly 8, second hub unit 8 is identical as 5 structure of first wheel component, and the axle housing 1 includes first shell 11, second Shell 12 and third shell 13,11 interlude of first shell are that its cylindric both ends are flare openings, the first shell Body 11 is identical with 13 structure of third shell, and is fixed on 11 both ends of first shell, institute by an equally distributed hex screw of circle It states input assembly 2 and encloses equally distributed hex screw by one and be fixed in first shell 11, first wheel component 5 is mounted on the On two shells 12, the second hub unit is mounted on third shell 13.

The 11 both ends top of first shell is designed with gas vent 121, which is located at bell-mouthed tapered zone Domain, gas vent 121 are only needing to open gas vent 121 in initially addition pressure oil in wet-type braking driving axle to exclude oil pocket Air in 75 requires to block gas vent 121 by bleed screw at other, to achieve the effect that sealing.

In the parking brake bracket 111 that 11 front end of first shell is fixed also by screw, parking brake 112 is installed On parking brake bracket 111, parking brake 112 can control parking braking stent clamping to brake flange 24, make deceleration method Orchid 24 can not rotate.

Velocity sensor 113 is installed in the middle position on 11 top of first shell, for monitoring the second of input assembly 2 The real-time revolving speed of bevel gear 215；In this embodiment, the preferred spiral shell umbrella gear wheel of the second bevel gear 215.

It is equipped with oil level mouth 114 in the rear end of first shell 11, the center of the oil level mouth 114 is located at level identical with Fig. 3 On face, to facilitate the concrete condition of lubricating oil in observation first shell 11.

It is equipped with oil filler 115 at 11 top of first shell place to the right, is sealed usually by plug screw and O-ring seal.

It is equipped with fuel outlet 116 at 11 lower part of first shell place to the left, passes through magnetic oil draining bolt and O-ring seal usually Sealing.

A kind of drive axle as shown in Figure 3, including axle housing 1, input assembly 2, the first semiaxis 3, the first brake assembly 4, First wheel component 5, the second semiaxis 6, second brake assembly 7 and the second hub unit 8, the axle housing 1 include second shell 12, first shell 11 and third shell 13, it is flare openings that 11 interlude of first shell, which is its cylindric both ends, first Brake assembly 4 is identical with 7 structure of second brake assembly, and first wheel component 5 is identical with 8 structure of the second hub unit, institute It states input assembly 2 to be mounted in first shell 11, first brake assembly 4 is located at 11 half section of a left side of first shell, the first round Hub assembly 5 is mounted in second shell 12, and second shell 12 is fixed on first shell by an equally distributed hex screw of circle 11 left ends, 3 right sections of first semiaxis are connected with input assembly 2, first semiaxis 3 pass through the first brake assembly 4 and with First wheel component 5 is connected, and the second brake assembly 7 is located at 11 half section of the right side of first shell, and the second hub unit 8 is mounted on On third shell 13, third shell 13 is fixed on 11 right end of first shell by an equally distributed hex screw of circle, and described the Two 6 left sections of semiaxis with input assembly 2 connect, second semiaxis 6 pass through second brake assembly 7 and with the second hub unit 8 Connection.

Input assembly 2 as shown in Figure 4 includes differential mechanism seat 20 and the differential mechanism 21 being mounted on differential mechanism seat 20, moves Power input shaft 22, the first bevel gear 221, input flange 23 and braking flange 24, the differential mechanism seat 20 are uniformly divided by a circle The hex screw of cloth is fixed in first shell 11, and the power input shaft 22 and the first bevel gear 221 are integrally formed, the first umbrella The preferred spiral shell umbrella pinion gear of gear 221, the differential mechanism 21 include differential casing 211, first planetary gear 212, the second semiaxis Gear 213 and the first axle shaft gear 214, differential casing 211 are mounted on differential mechanism seat 20 and can turn on differential mechanism seat 20 It is dynamic, tapered roller bearing is equipped between differential casing 211 and differential mechanism seat 20 and the second nut, tapered roller bearing cover It on differential casing 211, and is interference fitted with differential mechanism seat 20 and differential casing 211, for ensuring differential casing 211 Smooth rotation, the second nut are mounted between tapered roller bearing and differential mechanism seat 20, are fixed with second on differential casing 211 Bevel gear 215, the preferred spiral shell umbrella gear wheel of the second bevel gear 215, the second bevel gear 215 and the first bevel gear 221 are intermeshed, the The rotation of one planetary gear 212 is fixed on inside differential casing 211, the first axle shaft gear 214 and the second axle shaft gear 213 difference The left and right sides inside differential casing 211, and the first axle shaft gear 214 and the second axle shaft gear 213 are and the first row Star gear 212 engages, and first semiaxis 3, the second semiaxis 6 run through differential casing 211, and plug be fixed on the first half respectively On shaft gear 214 and the second axle shaft gear 213, the braking flange 24 is equipped with the first centre bore, in first centre bore Half section is cooperated by spline and the transmission of power input shaft 22, and is additionally provided with dustband 25, and the dustband 25 is located at the first center Hole port is simultaneously set on input flange 23, is matched by spline and the transmission of 23 outer wall of input flange for half section outside first centre bore Close, input flange 23 can on the first centre bore axial float, in this way relative to it is existing add a transmission shaft again compared with, only Increase one it is coaxial with power input shaft 22 and can be relative to the input flange 23 of braking 24 axial float of flange, input is total It is only transferred to input flange 23 at the vibration between 2 and speed changer, vibration can be offset by the axial float of input flange 23, So that the independence of input assembly 2 and speed changer increases, and structure is more compact and reasonable, and space utilization rate small in size is high, more It is suitble to fork truck installation.

In another embodiment of this programme, the input flange is equipped with the second centre bore, and second centre bore is logical Cross spline and braking flange outer wall transmission cooperate, input flange can on braking flange outer wall axial float, and dustband at this time Positioned at the second centre bore port and it is set on braking flange；In this embodiment, the first centre bore either through-hole or blind Kong Jieke, preferably the first centre bore is through-hole in the present embodiment.

Specifically, the first centre bore of the braking flange 24 is stepped hole, and the interior half hole diameter of the first centre bore is less than Its outer half hole diameter is threaded with the on one end that the power input shaft 22 protrudes into the first centre bore of braking flange 24 One nut 26, first nut 26 and the step in the first centre bore of braking flange 24 offset fixation.

Specifically, it is equipped with dustband 25 between input flange 23 and braking flange 24, the dustband 25 is set in input On flange 23 and it is located at the external port for braking the first centre bore of flange 24.

Specifically, the differential mechanism seat 20 is equipped with the first mounting hole 201, the power input shaft 22 and braking flange 24 It is mounted on the first mounting hole 201, sealing ring, spacer 27 and two first bearings 29, institute is cased on the power input shaft 22 State the preferred tapered roller bearing of first bearing 29, the preferred O-ring seal of sealing ring, described two first bearings 29 and first Mounting hole 201 and power input shaft 22 are interference fitted, and the spacer 27 is located between two first bearings 29, and the sealing ring is tight It pastes the first nut 26, the spacer 27 and is additionally provided with adjustment gasket between the first bearing 29 of outer end.

Power input shaft 22 and braking flange 24 may make smoothly to rotate on differential mechanism seat 20 by above setting.

Specifically, it is additionally provided with the first oil sealing 28, the preferred outside framework oil seal of the first oil sealing 28, first oil sealing 28 is located at first It at 201 exterior side port of mounting hole and covers on braking flange 24, first oil sealing 28 and the first mounting hole 201 and brakes flange 24 interference fits, so that it is guaranteed that the leakproofness of the first mounting hole 201.

For the present invention in the above structure, power is defeated from the input flange 23 that output shaft of gear-box flange passes to drive axle Enter flange 23 by spline and the transmission of braking flange 24 with closing to which power to be transferred on braking flange 24, brakes flange 24 Cooperated with power input shaft 22 by spline drived to which power to be transferred on power input shaft 22 and the first bevel gear 221, 215 engaged transmission of first bevel gear 221 and the second bevel gear, so that power is transferred to the second bevel gear 215 and differential carrier, It is passed on the second axle shaft gear 213 and the first axle shaft gear 214 by the first planetary gear 212 on differential mechanism again, passes through Power is transferred to the first semiaxis 3 by one axle shaft gear 214, and power is transferred to the second semiaxis 6 by the second axle shaft gear 213.

First brake assembly 4 as shown in Figure 5 includes the inner attrition piece 41 being located in 11 half section of a left side of first shell, pressure-bearing Plate (72), outside friction disc 42, annular piston 43, return spring 46 and return spring screw 45, bearing plate 72, outside friction disc 42 with The circumferentially positioned axial activity cooperation of first shell 11, inner attrition piece 41 and the circumferentially positioned axial activity of the first semiaxis 3 cooperate, multiple The inner attrition piece 41 and outside friction disc 42 of annular are alternately superimposed on each other, and annular piston 43 is between application position and non-braking position Mobile, return spring 46 makes annular piston 43 be moved to non-braking position from application position, is additionally provided with return spring seat 44, described Several second mounting holes are evenly distributed on 43 side of annular piston, the interference fit of return spring seat 44 is mounted on the second mounting hole Interior, return spring screw 45 passes through return spring seat 44 and is mounted in first shell 11, and 46 sets of return spring in return spring On screw 45, and 46 one end of return spring is against on return spring seat 44, and the other end is against on return spring screw 45.

44 outer surface of return spring seat is interference fitted for cylindrical surface and with the second mounting hole 432, it is worth noting that, 44 outer surface of return spring seat can also be other shapes, such as triangular prism, cuboid, corresponding second mounting hole 432 are interference fitted with 44 outer surface of return spring seat, and specific manifestation form is between return spring seat 44 and annular piston 43 It can mutually drive and move each other, and when inner attrition piece 41 and outside friction disc 42 have abrasion, return spring screw 45 is limited The stroke of return spring seat 44 is the first gap 47, and there are still gap, annular piston 43 exists for annular piston 43 and outside friction disc 42 It is still axially movable under the action of oil pressure until end face resists outside friction disc 42.

Specifically, the one side of the annular piston 43 can offset with outside friction disc 42, the annular piston 43 it is another One side can offset with first shell 11, and 43 circumferential side wall of annular piston is equipped with the first annular groove 433 and the second annular groove 434, The first sealing ring and the second sealing ring are respectively equipped in first annular groove 433 and the second annular groove 434.

Specifically, the return spring screw 45 is equipped with the first flange 451, and 46 one end of return spring is against the first flange On 451, the other end is against on return spring seat 44, and the distance between first flange 451 and return spring seat 44 are first Gap 47, when annular piston 43 is moved to from non-braking position against the application position of outside friction disc 42, the first flange 451 can Return spring seat 44 is resisted, so that the stroke for limiting return spring seat 44 is the first gap 47, in the present embodiment the first flange 451 can be discoid or other shapes, need to only be moved to from non-braking position against external friction when annular piston 43 When the application position of piece 42, the first flange 451 can resist return spring seat 44, and in the present embodiment, the first flange 451 is excellent Select it is discoid, and disk diameter be greater than spring base interior diameter, return spring seat 44 can be resisted in this way.

Specifically, bearing plate 72 is annular shape, and bearing plate 72 is coaxial with inner attrition piece 41 and outside friction disc 42 and resists outer Friction plate 42, the bearing plate 72 and annular piston 43 are located at the not ipsilateral of inner attrition piece 41 and outside friction disc 42, described 72 sets of bearing plate on the first semiaxis 3, the bearing plate 72 is located at inner attrition piece 41 and outside friction disc with annular piston 43 42 not ipsilateral, the mandrel 71 and the circumferentially positioned cooperation of outside friction disc 42, being circularly and evenly distributed on the bearing plate 72 has Several 4th mounting holes, the mandrel 71 pass through the 4th mounting hole and bearing plate 72 are fixed in second shell 12.

Specifically, the first retaining ring 73 and the second retaining ring 74 are additionally provided with, first retaining ring 73 and 74 sets of the second retaining ring are On one semiaxis 3,74 sets of first retaining ring 73 and the second retaining ring are coaxial with inner attrition piece 41, and are located at inner attrition piece 41 and rub outside 42 two sides of pad a, so that position-limiting action is played to friction plate, to prevent 42 axial float model of inner attrition piece 41 and outside friction disc It encloses.

Specifically, it is additionally provided with the second planetary gear 9, there are three the second planetary gears 9, respectively circumferentially evenly around the Around one semiaxis 3, and between bearing plate 72 and first wheel component 5, the 9 both ends gear of the second planetary gear respectively with First semiaxis 3 and the transmission cooperation of first wheel component 5.

7 structure of second brake assembly is identical as 4 structure of the first brake assembly, all include more than structure.

The present invention is in the above structure, and in the state of releasing braking, the first semiaxis 3 with the second planetary gear 9 by matching It closes transmission and power is transferred to the second planetary gear 9, the second planetary gear 9 with the transmission cooperation of first wheel component 5 by that will move Power is transferred to first wheel component 5, so that external expressive form is revolver rotation, the power of drive axle right half part is transmitted Situation is identical with left-half；

Under the on-position that annular piston 43 resists outside friction disc 42, inner attrition piece 41 and outside friction disc 42 are in frictional force Under the action of can not be freely rotated again, which is transferred to again on the first semiaxis 3, the second planetary gear 9 and first wheel component 5, so that revolver revolving speed reduces or stops operating, situation and left side split-phase are transmitted for the resistance of drive axle right half part Together.

It is wet-type braking driving axle friction plate of the present invention brake release state without abrasion, under this state, ring as shown in Figure 6 The end face of the smaller side of 43 diameter of shape piston is against on a mounting surface in first shell 11, in the present embodiment for convenience of really Recognize, the title of the mounting surface in the second shell 12 is called the first mounting surface 122, in return spring seat 44 and annular piston 43 The second mounting hole 432 interference fit, and 44 one end end face of return spring seat is against on the first mounting surface 122, under this state, is returned The first flange 451 returned on spring screw 45 and return spring seat 44 the distance between be the first gap 47.

Enter pressure oil in oil pocket 75, it is non-brake that annular piston 43 drives return spring seat 44 to separate from outside friction disc 42 Position is mobile to the application position against outside friction disc 42, until annular piston 43 is reached against the braking point of outside friction disc 42, As shown in fig. 7, being wet-type braking driving axle friction plate on-position without abrasion of the present invention, under this state, annular piston 43 end faces for being relatively large in diameter side are against on outside friction disc 42, and the end face of the smaller side of its diameter remains unchanged and return spring seat 44 One end end face, and the end face of 44 other end of return spring seat is against on the first flange 451 on return spring screw 45, this Under state, the distance between return spring seat 44 and the first mounting surface 122 are the first gap 47, and 43 diameter of annular piston is smaller by one The distance between the end face of side and the first mounting surface 122 are similarly the first gap 47, i.e. return spring seat 44 and annular piston 43 Displacement be all the first gap 47.

And when inner attrition piece 41 and outside friction disc 42 are worn, return spring screw 45 limits return spring seat 44 Stroke is the first gap 47, and annular piston 43 is still axially movable until end face resists outside friction disc 42, as such as Fig. 9 institute Show, when there is abrasion in wet-type braking driving axle inner attrition piece 41 of the present invention and outside friction disc 42, when annular piston 43 reach to When by the application position of outside friction disc 42, the end face of the end face of the smaller side of 43 diameter of annular piston and return spring seat 44 is no longer It flushes, the prominent a part in end face of the end face of return spring seat 44 relative to the smaller side of 43 diameter of annular piston, and returns to bullet The other end of spring abutment 44 is against on the first flange 451 on return spring screw 45, under this state, return spring seat 44 and The distance between one mounting surface 122 is the first gap 47, the end face of the smaller side of 43 diameter of annular piston and the first mounting surface 122 The distance between be the second gap 48, the second gap 48 be greater than the first gap 47.

Drain pressure oil in oil pocket 75, return spring seat 44 is under the action of return spring 46 to far from 41 He of inner attrition piece The direction of outside friction disc 42 is mobile, and annular piston 43 is driven to move together, until reaching non-brake state as shown in Figure 8, In this process, the displacement of return spring seat 44 and annular piston 43 is all the first gap 47, therefore 43 diameter of annular piston There are third spaces 49 between the end face of smaller side and the first mounting surface 122, and the sum of third space 49 and the first gap 47 are i.e. End face for the second gap 48, return spring seat 44 is prominent a part of relative to the end face of the smaller side of 43 diameter of annular piston, And this end face of return spring seat 44 is against on the first mounting surface 122, and under this state, the first flange on return spring screw 45 451 with return spring seat 44 the distance between be the first gap 47.

It is worth noting that being separated from against the arrival of the braking point of outside friction disc 42 with outside friction disc 42 in annular piston 43 Non-braking position during, no matter inner attrition piece 41 and outside friction disc 42 whether there is abrasion condition, return spring seat 44 Annular piston 43 is driven to move jointly to the direction far from inner attrition piece 41 and outside friction disc 42, moving distance is in the first flange 451 and first mounting surface 122 limit under be always the first gap 47, i.e. the layback of annular piston 43 is always between first Gap 47, i.e. annular piston 43 reach annular piston 43 from against outer from the non-braking position isolated with outside friction disc 42 next time When the application position of friction plate 42, displacement is always the first gap 47 required for annular piston 43, to reach internal friction Piece 41 and outside friction disc 42 wear the purpose compensated, so that brake assembly is in use, braking distance is protected always It holds constant, ensure that braking effect, but also inner attrition piece 41 and outside friction disc 42 are more durable, reduce inner attrition piece 41 With the maintenance cost of outside friction disc 42.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any One or more embodiment or examples in can be combined in any suitable manner.

Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is not considered as limiting the invention, those skilled in the art are not departing from the principle of the present invention and objective In the case where can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.It is all of the invention Within spirit and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.

Claims

1. a kind of brake assembly, including inner attrition piece (41), the bearing plate (72), outside friction disc being located in first shell (11) (42), annular piston (43), return spring (46) and return spring screw (45), bearing plate (72), outside friction disc (42) and the The circumferentially positioned axial activity cooperation of one shell (11), inner attrition piece (41) and the first semiaxis (3) circumferentially positioned axial activity cooperate, The inner attrition piece (41) and outside friction disc (42) of multiple annulars are alternately superimposed on each other, and annular piston (43) is in application position and non-system It is moved between dynamic position, return spring (46) makes annular piston (43) be moved to non-braking position from application position, and feature exists In,

It is additionally provided with return spring seat (44), is evenly distributed with several second mounting holes on annular piston (43) side, return Spring base (44) interference fit is mounted in the second mounting hole, and return spring screw (45) passes through return spring seat (44) and installs On first shell (11), return spring (46) covers on return spring screw (45), and return spring (46) one end is against and returns It springs back on spring abutment (44), the other end is against on return spring screw (45).

2. a kind of brake assembly according to claim 1, which is characterized in that return spring screw (45) limitation returns to bullet The stroke of spring abutment (44) is the first gap (47), and annular piston (43) and return spring seat (44) interference fit are common mobile, when When inner attrition piece (41) and outside friction disc (42) are in non-state of wear, the application position and non-braking position of annular piston (43) Between displacement stroke be not more than the first gap (47)；When inner attrition piece (41) and outside friction disc (42) generate abrasion, annular Fixation, return spring screw (45) limitation are still interference fitted after generating relative displacement between piston (43) and return spring seat (44) The stroke of return spring seat (44) is the first gap (47), thus between the application position and non-braking position of annular piston (43) Displacement stroke be the first gap (47).

3. a kind of brake assembly according to claim 2, which is characterized in that the return spring screw (45) is equipped with The centre bore of first flange (451), return spring seat (44) is stepped hole, and return spring (46) one end is against return spring screw (45) on the first flange (451), the other end is against on the centre bore step of return spring seat (44).

4. a kind of brake assembly according to claim 3, which is characterized in that first flange (451) and return bullet The distance between spring abutment (44) is the first gap (47), when annular piston (43) is moved to application position from non-braking position, First flange (451) can resist return spring seat (44), so that the stroke for limiting return spring seat (44) is the first gap (47).

5. a kind of brake assembly according to claim 1, which is characterized in that the one side energy of the annular piston (43) Enough to offset with outside friction disc (42), the another side of the annular piston (43) can offset with first shell (11), and annular is living It fills in (43) circumferential side wall and is equipped with the first annular groove (433) and the second annular groove (434), first annular groove (433) and the second annular groove (434) the first sealing ring and the second sealing ring are respectively equipped in.

6. a kind of brake assembly according to claim 1, which is characterized in that bearing plate (72) is annular shape, bearing plate (72) coaxial with inner attrition piece (41) and outside friction disc (42) and resist outside friction disc (42), the bearing plate (72) and annular are living Plug (43) is located at the not ipsilateral of inner attrition piece (41) and outside friction disc (42).

7. a kind of brake assembly according to claim 6, which is characterized in that be additionally provided with mandrel (71), the mandrel (71) with outside friction disc (42) circumferentially positioned cooperation, being circularly and evenly distributed on the bearing plate (72) has several four installations Hole, the mandrel (71) pass through the 4th mounting hole and bearing plate (72) are fixed in the first axle housing (1).

8. a kind of brake assembly according to claim 1, which is characterized in that be additionally provided with the first retaining ring (73) and second gear It encloses (74), first retaining ring (73) and the second retaining ring (74) cover on the first semiaxis (3) and with inner attrition piece (41) coaxially, institute It states the first retaining ring (73) and the second retaining ring (74) is located at inner attrition piece (41) two sides, so that the axial direction for limiting inner attrition piece (41) is altered Dynamic range.

9. a kind of drive axle, which is characterized in that including brake assembly of any of claims 1-8.