CN218577414U - Drive axle assembly and tractor - Google Patents

Abstract

The utility model relates to a drive axle assembly and a tractor, which comprises an input gear shaft, a power input gear, a differential mechanism and two final drivers, wherein the two final drivers are oppositely arranged at two ends of the differential mechanism and are respectively in transmission connection with the differential mechanism; the power input gear is fixedly sleeved on the differential mechanism, the input gear shaft is arranged on one side of the differential mechanism, is meshed with the power input gear and can rotate around the axial direction of the input gear shaft to drive the power input gear to rotate. The utility model has the advantages of compact structure, reasonable design, rapid power transmission, integration of service braking and parking braking, and convenient use; in addition, the number of elements is small, the occupied space is small, and the layout is convenient.

Description

Drive axle assembly and tractor

Technical Field

The utility model relates to a tractor technical field, concretely relates to drive axle assembly and tractor.

Background

The rear drive axle of domestic tractor generally includes central transmission, left and right brake assemblies, left and right final transmission, and in the rear axle shell also the auxiliary speed-changing and shuttle-type gear assemblies can be mounted. Power is input from a central transmission input gear shaft, is transmitted to a half shaft gear of final transmission through a differential mechanism, is decelerated and torque-increased through a final transmission assembly, and is transmitted to wheels to drive a tractor to run. When the brake works, the left and right half-shaft gears are braked to realize braking deceleration, and the parking brake is generally positioned at an input gear shaft of the central transmission.

When the existing tractor rear drive axle is applied to a high-horsepower tractor, the arrangement space is large, two sets of brake assemblies are needed, parking braking and service braking are independent, the number of elements is large, and the cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a transaxle assembly and tractor are provided, aim at solving the problem among the prior art.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

a drive axle assembly comprises an input gear shaft, a power input gear, a differential and two final drivers, wherein the two final drivers are oppositely arranged at two ends of the differential and are respectively in transmission connection with the differential; the power input gear is fixedly sleeved on the differential, the input gear shaft is installed on one side of the differential, meshed with the power input gear and capable of rotating around the axial direction of the input gear shaft to drive the power input gear to rotate.

The beneficial effects of the utility model are that: when the power transmission device works, power is input through the input gear shaft, transmitted to the differential through the power input gear, transmitted to the two final drivers through the differential, and transmitted to equipment needing power through the two final drivers, so that the power transmission is convenient.

The utility model has compact structure, reasonable design, fast power transmission and convenient use; in addition, the number of elements is small, the occupied space is small, and the layout is convenient.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, the differential mechanism comprises a differential mechanism shell, a differential transmission mechanism and two sun gear shafts, wherein the two sun gear shafts are arranged oppositely, are respectively perpendicular to the axial direction of the input gear shaft and can respectively rotate around the axial direction of the input gear shaft, and the ends, far away from each other, of the two sun gear shafts are respectively in transmission connection with the two final drivers; the differential shell is sleeved outside one end of each of the two sun gear shafts close to each other and can rotate around the axial direction of the sun gear shaft, and the power input gear is fixedly sleeved outside the differential shell; the differential transmission mechanism is arranged in the differential shell, can rotate along with the differential shell, and is in transmission connection with one end, close to each other, of the two sun wheel shafts.

The power input gear is connected with the power input gear shaft, and the power input gear is connected with the differential shell; then, the differential shell respectively drives the two sun wheel shafts to rotate through the differential transmission mechanism, the two sun wheel shafts respectively drive the two final drivers to rotate, and finally the two final drivers transmit power to equipment needing power, so that the power transmission is convenient, the structure is compact, and the occupied space is small.

Further, each of the final transmissions includes a drive shaft, a ring gear and a planetary mechanism, each of the drive shafts is mounted at one end of the differential case corresponding to the sun gear shaft, is parallel to the sun gear shaft and can rotate around the axial direction of the drive shaft; the gear ring and the driving shaft are coaxial and fixedly arranged, and the gear ring is positioned outside one end, close to the corresponding sun gear shaft, of the driving shaft; the planetary mechanism is mounted on one end of the drive shaft near the sun gear shaft, and is engaged with the ring gear and the sun gear shaft, respectively.

The power input gear shaft is connected with the power input gear, and the power input gear is connected with the differential shell; then, the differential shell respectively drives the two sun wheel shafts to rotate through the differential transmission mechanism, the two sun wheel shafts respectively drive the two driving shafts to rotate through the planetary mechanism and the gear ring, and finally the two driving shafts transmit power to equipment needing power.

Furthermore, the differential transmission mechanism comprises a long planet wheel shaft and two short planet wheel shafts, the long planet wheel shaft is detachably arranged in the differential shell, and a through hole penetrating through the long planet wheel shaft is formed in the center of the long planet wheel shaft; the two short planet wheel shafts are relatively detachably mounted in the differential shell, are respectively perpendicular to the long planet wheel shafts and are distributed, and the opposite ends of the two short planet wheel shafts respectively penetrate through the two ends of the through hole and extend into the through hole; the long planet wheel shafts are respectively vertical to the axial direction of the sun wheel shaft, and two ends of the long planet wheel shafts are respectively sleeved with planet gears through needle roller bearings in a coaxial rotating mode; and one end of each of the two sun gear shafts, which is close to each other, is respectively and coaxially fixedly sleeved with a left half axle gear and a right half axle gear, and the left half axle gear and the right half axle gear are respectively meshed with the four planetary gears.

The further scheme has the advantages that during operation, power is input from the differential shell, so that the differential shell rotates around the center line of the differential shell; the long planet wheel shaft and the two short planet wheel shafts can be respectively driven to revolve around the central line of the differential shell in the rotation process of the differential shell, so that the power transmission is realized; the long planetary wheel shaft and the two short planetary wheel shafts respectively drive the plurality of planetary gears to revolve in the revolution process, and the plurality of planetary gears respectively drive the left half axle gear and the right half axle gear to rotate, so that the two sun wheel shafts are driven to rotate, and the power is transmitted to the two sun wheel shafts;

in the scheme, the long planet wheel shaft and the two short planet wheel shafts are mounted in a convenient manner and are dismounted, the mounting and dismounting convenience of the whole differential and the working reliability are improved, and the differential is suitable for working of the differential with high horsepower.

Further, the differential further includes a clutch mounted in the differential case for engaging or disengaging the differential case and the left side gear or the right side gear.

The beneficial effect of adopting above-mentioned further scheme is that in the operation process, can make differential mechanism casing and left side gear or right side gear combine or separate through the clutch to realize the same speed transmission or the differential transmission of both sides drive shaft.

And the integrated brake is arranged on one side of the differential case, is in transmission connection with the differential case and is used for braking the differential case.

The beneficial effect of adopting above-mentioned further scheme is that in the operation process, brakes to differential mechanism casing through integrated stopper, realizes service braking and parking braking, and the braking is convenient.

Furthermore, the integrated brake comprises a brake shell, a friction plate assembly, a service braking mechanism and a parking braking mechanism, wherein the brake shell is fixedly arranged and is positioned outside one end of the differential shell, and one end of the brake shell is provided with an opening which penetrates through the inside and the outside;

the friction plate assembly is arranged in the brake shell, the inner side of the friction plate assembly is connected with the differential shell through an internal spline, and the outer side of the friction plate assembly is connected with the brake shell through an external spline; service brake mechanism with parking brake mechanism installs respectively in the stopper casing, it is located respectively the both ends of friction disc assembly, service brake mechanism is used for the extrusion or loosens the friction disc assembly is in order to carry out service brake, parking brake mechanism is used for the extrusion or loosens friction disc assembly is in order to carry out parking brake.

The friction plate assembly can be squeezed or loosened by the service brake mechanism to perform service braking; on the other hand, accessible parking braking mechanism extrusion or loosen the friction disc assembly in order to carry out parking braking, simple structure, reasonable in design collects service brake and parking braking in an organic whole, compact structure, and the braking is convenient, and component quantity is few, has reduced and has arranged the space and the cost is reduced.

Further, the service brake mechanism comprises a service brake piston, the service brake piston is installed at one end in the brake shell and can reciprocate along the direction from one end of the brake shell to the other end of the brake shell to press or release the friction plate assembly.

The beneficial effect of adopting the above further scheme is that during operation, the service brake piston reciprocates in the brake shell in a mode that can be thought by a person skilled in the art, and the friction plate assembly is extruded or loosened, so that service brake is realized, and the brake is convenient.

Further, the parking brake mechanism includes a parking brake piston installed at the other end in the brake housing, which is reciprocally movable in a direction from one end to the other end of the brake housing to press or release the friction plate assembly.

The parking brake piston has the beneficial effects that during operation, the parking brake piston can reciprocate in the brake shell in a mode which can be thought by a person skilled in the art, and the friction plate assembly is extruded or loosened, so that parking brake is realized, and braking is convenient.

The utility model discloses still relate to a tractor, include as above the transaxle assembly.

The tractor adopting the further scheme has the advantages that the tractor is compact in structure and reasonable in design, the rapid power transmission is realized, the running brake and the parking brake are integrated, and the use is convenient; in addition, the number of elements is small, the occupied space is small, and the layout is convenient.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a partial schematic structural view of the present invention;

FIG. 4 is a schematic diagram of the final drive of the present invention;

FIG. 5 is a sectional view taken along line B-B of FIG. 4;

FIG. 6 is a schematic view of the overall structure of the differential mechanism of the present invention;

FIG. 7 is a schematic view of a partial structure of a differential mechanism according to the present invention;

fig. 8 is a schematic view of the internal structure of the present invention;

FIG. 9 is a cross-sectional view taken along line C-C of FIG. 8;

fig. 10 is a schematic structural diagram of an integrated brake according to the present invention;

fig. 11 is a schematic diagram of the internal structure of the integrated brake of the present invention.

In the drawings, the reference numbers indicate the following list of parts:

1. an input gear shaft; 2. a power input gear; 3. a differential case; 4. a sun gear shaft; 5. a long planet axle; 6. a short planet wheel shaft; 7. a planetary gear; 8. a left side gear; 9. a right half shaft gear; 10. a clutch; 11. a drive shaft; 12. a ring gear; 13. a brake housing; 14. a friction plate assembly; 15. a service brake piston; 16. a parking brake piston; 17. a main housing; 18. a planet carrier; 19. a first planet gear; 20. a second planet gear; 21. a planetary gear shaft; 22. a housing; 23. a parking brake seat; 24. and a return spring.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. 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," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, 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 meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example 1

As shown in fig. 1 to 11, the present embodiment provides a drive axle assembly, which includes an input gear shaft 1, a power input gear 2, a differential and two final drives, wherein the two final drives are oppositely installed at two ends of the differential and are respectively in transmission connection with the differential; the power input gear 2 is fixedly sleeved on the differential, the input gear shaft 1 is installed on one side of the differential, meshed with the power input gear 2 and capable of rotating around the axial direction of the input gear shaft to drive the power input gear 2 to rotate.

During operation, power is input through the input gear shaft 1, transmitted to the differential through the power input gear 2, transmitted to the two final drivers through the differential and transmitted to equipment needing power through the two final drivers, and power transmission is convenient.

Preferably, the present embodiment further comprises a main housing 17, wherein the main housing 17 covers the differential, is open at two ends, and is fixedly connected with the two final drivers through bolts respectively.

In addition, one side of the general housing 17 is provided with an opening through which one end of the input gear shaft 1 passes and extends outside the general housing 17 for connection to a power plant.

The power transmission device is compact in structure, reasonable in design, convenient to use and capable of achieving rapid power transmission; in addition, the number of elements is small, the occupied space is small, and the layout is convenient.

Example 2

On the basis of the embodiment 1, in the embodiment, the differential mechanism comprises a differential mechanism shell 3, a differential transmission mechanism and two sun gear shafts 4, wherein the two sun gear shafts 4 are oppositely arranged, are respectively perpendicular to the axial direction of the input gear shaft 1 and can respectively rotate around the axial direction of the input gear shaft, and one ends, far away from each other, of the two sun gear shafts are respectively in transmission connection with two final drivers; the differential shell 3 is sleeved outside one end of each of the two sun gear shafts 4 close to each other and can rotate around the axial direction of the sun gear shaft 4, and the power input gear 2 is fixedly sleeved outside the differential shell 3; the differential transmission mechanism is arranged in the differential case 3, can rotate along with the differential case 3, and is in transmission connection with one end of the two sun gear shafts 4 close to each other.

During operation, power is input through the input gear shaft 1 and is transmitted to the differential shell 3 through the power input gear 2, so that the differential shell 3 rotates; then, the differential housing 3 drives the two sun wheel shafts 4 to rotate through the differential transmission mechanism respectively, the two sun wheel shafts 4 drive the two final drivers to rotate respectively, and finally the two final drivers transmit power to equipment needing power.

Example 3

On the basis of embodiment 2, in the present embodiment, each final transmission includes a drive shaft 11, a ring gear 12 and a planetary mechanism, each drive shaft 11 is mounted at one end of the corresponding sun gear shaft 4 outside the differential case 3, is parallel to the sun gear shaft 4 and can rotate around its own axis; the gear ring 12 is coaxial and fixedly arranged with the driving shaft 11 and is positioned outside one end of the driving shaft 11 close to the corresponding sun gear shaft 4; the planetary mechanism is mounted on the end of the drive shaft 11 near the sun gear shaft 4, which meshes with the ring gear 12 and the sun gear shaft 4, respectively.

During operation, power is input through the input gear shaft 1 and is transmitted to the differential shell 3 through the power input gear 2, so that the differential shell 3 rotates; then, the differential housing 3 drives the two sun gear shafts 4 to rotate through the differential transmission mechanism, the two sun gear shafts 4 drive the two driving shafts 11 to rotate through the planetary mechanism and the gear ring 12, and finally the two driving shafts 11 transmit power to equipment needing power.

Preferably, in the present embodiment, the planetary mechanism includes a planet carrier 18 and a plurality of planetary gear assemblies, the planet carrier 18 is fixedly installed at one end of the driving shaft 11; a plurality of planetary gear assemblies are arranged at regular intervals along the circumference of the drive shaft 11 and rotatably mounted on a carrier 18, which meshes with the sun gear shaft 4 and the ring gear 12, respectively. During operation, power is input through the sun gear shaft 4, and the sun gear shaft 4 drives the planetary gear assemblies to rotate by utilizing the meshing force between the sun gear shaft 4 and the planetary gear assemblies; meanwhile, the gear ring 12 is fixed, and the gear ring 12 drives the plurality of planetary gear assemblies to revolve by using the meshing force between the gear ring 12 and the plurality of planetary gear assemblies, so that the planet carrier 18 and the driving shaft 11 are driven to rotate, the power is quickly transmitted, the power transmission is convenient, the transmission ratio is high, and the occupied space is small.

Preferably, in this embodiment, the planet carrier 18 is in a ring structure, and is coaxially fixed and fixed on the driving shaft 11 through a spline; the carrier 18 has a structure with one end thick and the other end thin, and the thin end is close to the sun gear shaft 4.

Preferably, in the present embodiment, each planetary gear assembly includes a first planetary gear 19 and a second planetary gear 20, a plurality of planetary gear shafts 21 corresponding to the planetary gear assemblies one by one are fixedly mounted on the planet carrier 18, and the planetary gear shafts 21 are parallel to the driving shaft 11; the first planet gear 19 and the second planet gear 20 are respectively sleeved on the planet gear shaft 21 in a coaxial rotating manner, and one ends of the first planet gear and the second planet gear, which are close to each other, are fixedly connected; the first planet gear 19 meshes with the sun gear shaft 1, and the second planet gear 20 meshes with the ring gear 12. During operation, power is input through the sun gear shaft 4, and the sun gear shaft 4 drives the planetary gears I19 and the planetary gears II 20 to rotate by utilizing the meshing force between the sun gear shaft 4 and the planetary gears I19; meanwhile, the gear ring 12 is fixed, and the gear ring 12 drives the first planet gears 19 and the second planet gears 20 to revolve by using the meshing force between the gear ring 12 and the second planet gears 20, so that the planet carrier 18 and the driving shaft 11 are driven to rotate, the rapid power transmission is realized, the power transmission is convenient, the transmission ratio is large, and the occupied space is small.

In addition, the outer diameter of the first planetary gear 19 is larger than that of the second planetary gear 20, the scheme is simple in structure, reasonable in design and convenient to arrange, and meshing between the first planetary gear 19 and the sun gear shaft 1 and meshing between the second planetary gear 20 and the gear ring 12 are facilitated.

Furthermore, a plurality of first planet gears 19 are respectively located outside the ring gear 12, and a plurality of second planet gears 20 are respectively located inside the ring gear 12.

Preferably, in this embodiment, each final drive further comprises a housing 22, the housing 22 being open at both ends; the driving shaft 11 is rotatably installed in the housing 22 in a direction from one end of the housing to the other end, one end of which extends to the outside of one end of the housing 22 and is close to one end of the sun gear shaft 4, and the other end of which extends to the outside of the other end of the housing 22; the ring gear 12 is fixedly mounted at one end of the housing 22.

In addition, the housing 22 has a thick end and a thin end, and facilitates installation of the ring gear 12 and the drive shaft 11.

Example 4

On the basis of any one of embodiments 2 to 3, in this embodiment, the differential transmission mechanism includes a long planetary wheel shaft 5 and two short planetary wheel shafts 6, the long planetary wheel shaft 5 is detachably mounted in the differential case 3, and a through hole is formed in the center of the long planetary wheel shaft; two short planet wheel shafts 6 are relatively detachably mounted in the differential housing 3, are respectively vertical to the long planet wheel shafts 5 and are distributed, and the opposite ends of the two short planet wheel shafts respectively penetrate through the two ends of the through hole and extend into the through hole; the long planet wheel shafts 5 are respectively vertical to the axial direction of the sun wheel shaft 4, and the two ends of the long planet wheel shafts are respectively sleeved with planet gears 7 which coaxially rotate through needle roller bearings; the mutually close ends of the two sun gear shafts 4 are respectively coaxially fixedly sleeved with a left half shaft gear 8 and a right half shaft gear 9, and the left half shaft gear 8 and the right half shaft gear 9 are respectively meshed with the four planet gears 7.

During operation, power is input from the differential case 3, so that the differential case 3 rotates around the center line of the differential case; the differential housing 3 can respectively drive the long planet wheel shaft 5 and the two short planet wheel shafts 6 to revolve around the central line of the differential housing 3 in the rotating process, so that the power transmission is realized; the long planetary wheel shaft 5 and the two short planetary wheel shafts 6 respectively drive the plurality of planetary gears 7 to revolve in the revolution process, and the plurality of planetary gears 7 respectively drive the left half-axle gear 8 and the right half-axle gear 9 to rotate, so that the two sun wheel shafts 4 are driven to rotate, and the power is transmitted to the two sun wheel shafts 4;

in the scheme, the long planet wheel shaft 5 and the two short planet wheel shafts 6 are mounted in a convenient manner and are dismounted, so that the mounting and dismounting convenience and the working reliability of the whole differential are improved, and the differential is suitable for working of the differential with larger horsepower.

Preferably, in the present embodiment, the parts of the long planetary wheel shaft 5 between the two corresponding planetary gears 7 and the through holes and/or the parts of the two short planetary wheel shafts 6 between the two corresponding planetary gears 7 and the through holes are respectively coaxially and fixedly sleeved with a long spacer. This scheme simple structure, reasonable in design through long spacer can multiplicable needle bearing's stability, avoids every planetary gear 7 to take place the drunkenness on corresponding axle.

In addition, the parts of the two ends of the long planet wheel shaft 5, which correspond to the parts between the two planet gears 7 and the differential case 3, and/or the parts of the two ends of the two short planet wheel shafts 6, which correspond to the parts between the two planet gears 7 and the differential case 3, are coaxially and fixedly sleeved with needle bearing spacer bushes respectively. This scheme simple structure, reasonable in design, through the stability of bearing increase needle bearing of bearing spacer, avoid every planetary gear 7 to take place the drunkenness on corresponding axle.

And the two ends of the long planet wheel shaft 5 are positioned between the two corresponding needle bearing spacers and the differential case 3 and/or the two ends of the two short planet wheel shafts 6 are positioned between the two corresponding needle bearing spacers and the differential case 3, and are respectively coaxially and fixedly sleeved with anti-rotation bearing bushes. This scheme simple structure, reasonable in design can effectively prevent differential mechanism casing 3's wearing and tearing through preventing changeing the axle bush, has reduced differential mechanism casing 3's machined surface quality.

Example 5

On the basis of embodiment 4, in this embodiment, the differential further includes a clutch 10, and the clutch 10 is mounted in the differential case 3, and is used for coupling or uncoupling the differential case 3 and the left side gear 8 or the right side gear 9.

In the operation process, the differential case 3 and the left side gear 8 or the right side gear 9 can be combined or separated through the clutch 10, so that the same-speed transmission or differential transmission of the driving shafts on two sides is realized.

Preferably, in this embodiment, the clutch is a friction plate clutch, and the friction plate clutch is installed in the differential case 3 and includes a driving member, a plurality of annular steel plates and a plurality of annular friction plates, and the plurality of steel plates and the plurality of friction plates are sequentially staggered and coaxially sleeved on any one of the sun gear shafts 4; the outer sides of the steel sheets are connected with the differential case 3 through splines, can rotate along with the differential case 3 and can move along the central line of the differential case 3; the inner sides of the friction plates are connected with the left half axle gear 8 or the right half axle gear 9 through splines, can rotate together with the left half axle gear 8 or the right half axle gear 9, and can move along the axial direction of the left half axle gear 8 or the right half axle gear 9;

the driving piece is arranged in the differential shell 3, is in transmission connection with the steel sheets at the end part and is used for extruding the steel sheets and the friction sheets to be attached to each other or loosening the steel sheets and the friction sheets to be separated from each other.

When the vehicle runs, the steel sheets and the friction sheets are loosened through the driving piece to be separated from each other, and at the moment, the left half axle gear 8 and the right half axle gear 9 respectively rotate to realize the differential transmission of power;

during braking, the driving pieces drive the first steel sheets and the second steel sheets to be tightly attached to each other, and at the moment, the left half shaft gear 8 and the right half shaft gear 9 revolve along with the differential shell 3 respectively and cannot rotate, so that the left half shaft gear and the right half shaft gear rotate at the same rotating speed.

Preferably, in this embodiment, the specific structure and operation principle of the driving element are as follows:

the driving part is an annular driving ring, an annular bulge is arranged in the differential shell 3 and is positioned at one end of the plurality of steel sheets and the plurality of friction plates, an annular oil cavity is arranged at one end of the annular bulge close to the plurality of steel sheets and the plurality of friction plates, an oil port communicated with the annular oil cavity is arranged on the differential shell 3, and one end of the annular oil cavity close to the plurality of steel sheets and the plurality of friction plates is open;

the driving ring is movably arranged in the annular oil cavity, the edge of the driving ring is tightly attached to the wall of the annular oil cavity, and the driving ring can move in the annular oil cavity until one end of the driving ring extends out of the annular oil cavity and pushes the steel sheets and the friction plates to move to be tightly attached to each other.

In addition, the inner side and the outer side of the driving ring are respectively provided with an annular sealing groove, sealing rings are respectively arranged in the two annular sealing grooves, and the sealing rings are tightly attached to the wall of the annular oil cavity.

When the annular oil cavity is in work, for example, an oil pump is communicated with an oil port through a pipeline in a mode which can be thought by a person skilled in the art, and oil is sent into an area between the corresponding driving ring and the bottom of the annular oil cavity in the annular oil cavity through the oil pump; the pressure oil pushes the driving ring to move and extrude the plurality of steel sheets and the plurality of friction plates, so that the plurality of steel sheets and the plurality of friction plates are driven to be mutually attached; after the injection of the pressure oil is stopped, the driving ring returns under the action of the inertia force, so that the steel sheets and the friction plates are separated from each other.

Example 6

On the basis of any one of embodiments 2 to 5, the present embodiment further includes an integrated brake, which is installed on one side of the differential case 3 and is in transmission connection with the differential case 3 for braking the differential case 3.

In the operation process, the differential case 3 is braked by the integrated brake, so that the service brake and the parking brake are realized, and the brake is convenient.

Example 7

On the basis of embodiment 6, in this embodiment, the integrated brake includes a brake housing 13, a friction plate assembly 14, a service brake mechanism and a parking brake mechanism, the brake housing 13 is fixedly disposed, and is located outside one end of the differential housing 3, and one end of the brake housing is provided with an opening penetrating through the inside and the outside;

the friction plate assembly 14 is installed in the brake housing 13, the inner side of the friction plate assembly is connected with the differential housing 3 through an internal spline, and the outer side of the friction plate assembly is connected with the brake housing 13 through an external spline; the service braking mechanism and the parking braking mechanism are respectively installed in the brake shell 13 and respectively located at two ends of the friction plate assembly 14, the service braking mechanism is used for squeezing or releasing the friction plate assembly 14 to perform service braking, and the parking braking mechanism is used for squeezing or releasing the friction plate assembly 14 to perform parking braking.

In operation, on the one hand, the friction plate assembly 14 can be squeezed or released by the service brake mechanism to perform service braking; on the other hand, friction disc assembly 14 is extruded or loosened in order to carry out parking braking through parking braking mechanism, simple structure, reasonable in design collects service braking and parking braking in an organic whole, compact structure, and the braking is convenient, and component quantity is few, has reduced and has arranged the space and the cost is reduced.

It should be noted that the friction plate assembly 14 is made in the prior art, and the detailed structure and principle thereof are not described herein.

Example 8

In addition to embodiment 7, in this embodiment, the service brake mechanism includes a service brake piston 15, and the service brake piston 15 is mounted at one end in the brake housing 13 and is reciprocally movable in a direction from one end of the brake housing 13 to the other end thereof to compress or release the friction plate assembly 14.

During operation, the service brake piston 15 reciprocates in the brake housing 13 in a manner that can be thought of by a person skilled in the art, and the friction plate assembly 14 is squeezed or loosened, so that service braking is realized, and braking is convenient.

Preferably, in this embodiment, the other end of the brake housing 13 is provided with an annular groove, the service brake piston 15 has a structure with one thick end and the other thin end, the thick end of the service brake piston abuts against the friction plate assembly 14, and the thin end of the service brake piston extends into the annular groove and forms a service brake oil chamber with the annular groove; and a service braking oil port communicated with the service braking oil cavity is arranged on the brake shell 13.

During operation, pressure oil is injected into a service brake oil cavity from a service brake oil port in a manner which can be thought by a person skilled in the art, the service brake piston 15 is pushed by the pressure oil to be in the brake shell 13 and extrude the friction plate assembly 14, so that the friction plates and the spacers are tightly attached to realize service braking, and the differential shell 3 cannot rotate at the moment; after the pressure oil is stopped being injected, the friction plate assembly 14 gradually returns to loosen the friction plate assembly 14 under the action of inertia, so that the plurality of separation plates and the plurality of friction plates are separated from each other, the service brake is stopped, the differential case 2 can rotate at the moment, and the brake is convenient.

In addition, the service braking oil port is communicated with one end of a service braking oil pipe, and the other end of the service braking oil pipe is used for being connected with an oil supply device. This scheme simple structure, reasonable in design injects pressure oil into the service brake oil chamber from the service brake hydraulic fluid port through oil supply equipment and service brake oil pipe, and it is convenient to inject into.

The oil supply equipment adopts the prior art, for example, the oil supply equipment comprises an oil tank, the bottom of the oil tank is communicated with the other end of a service brake oil pipe, and an oil pump is fixedly installed on the service brake oil pipe.

Example 9

In the present embodiment, on the basis of any one of embodiments 7 to 8, the parking brake mechanism includes a parking brake piston 16, and the parking brake piston 16 is mounted at the other end in the brake housing 13, and is reciprocally movable in the direction from one end to the other end of the brake housing 13 to press or release the friction plate assembly 14.

During operation, the parking brake piston 16 reciprocates in the brake housing 13 in a manner that will occur to those skilled in the art, and presses or releases the friction plate assembly 14, so as to realize parking braking and facilitate braking.

Preferably, in the present embodiment, the parking brake piston 16 has a structure with a thick outer side and a thin inner side, and the thick side is provided with a step; the outer surface of the thick side of the parking brake piston 16 is attached to the inner wall of the brake housing 13, the inner surface of the thin side thereof is attached to the differential housing 3, and one end thereof away from the opening is abutted to the friction plate assembly 14;

a parking brake seat 23 is fixedly mounted on the brake shell 13, the inner side of the parking brake seat 23 extends into the brake shell 13 and is abutted against the step, a parking oil cavity is formed between the parking brake seat 23 and one end, close to the friction plate assembly 14, of the thick side of the parking brake piston 16, and a parking brake oil port communicated with the parking brake oil cavity is formed in the brake shell 13; also mounted within the brake housing 13 is a return spring 24, the return spring 24 abutting an end of the parking brake piston 16 remote from the friction plate assembly 14.

During operation, when pressure oil is not injected into the parking brake oil cavity, the friction plate assembly 14 extrudes the friction plate assembly 14 under the elastic force action of the return spring 24, so that the friction plates and the separating plates are tightly attached to realize parking brake, and the differential shell 3 cannot rotate at the moment; when pressure oil is injected into the parking brake oil cavity, the pressure oil pushes the parking brake piston 16 to loosen the friction plate assembly 14, so that the friction plates and the spacers are separated from each other, the return spring 24 is extruded at the same time, the parking brake is stopped, the differential shell 3 can rotate at the moment, and the braking is convenient.

In addition, the parking braking oil port is communicated with one end of a parking braking oil pipe, and the other end of the parking braking oil pipe is used for being connected with an oil supply device. The parking brake oil cavity is filled with pressure oil from the parking brake oil port through the oil supply equipment and the parking brake oil pipe, and the pressure oil is convenient to fill.

The oil supply equipment adopts the prior art, for example, the oil supply equipment comprises an oil tank, the bottom of the oil tank is communicated with the other end of a parking brake oil pipe, and an oil pump is fixedly installed on the parking brake oil pipe.

Example 10

On the basis of the above embodiments, the present embodiment further provides a tractor, which includes the drive axle assembly as described above.

The tractor provided by the embodiment has the advantages that the structure is compact, the design is reasonable, the rapid power transmission is realized, the service brake and the parking brake are integrated, and the use is convenient; in addition, the number of elements is small, the occupied space is small, and the layout is convenient.

The working principle of the utility model is as follows:

during operation, power is input through the input gear shaft 1 and is transmitted to the differential shell 3 through the power input gear 2, so that the differential shell 3 rotates; so that the differential case 3 rotates about its own center line; the differential housing 3 can respectively drive the long planet wheel shaft 5 and the two short planet wheel shafts 6 to revolve around the central line of the differential housing 3 in the rotating process, so that the power transmission is realized; the long planetary wheel shaft 5 and the two short planetary wheel shafts 6 respectively drive the plurality of planetary gears 7 to revolve in the revolution process, and the plurality of planetary gears 7 respectively drive the left half-axle gear 8 and the right half-axle gear 9 to rotate, so that the two sun wheel shafts 4 are driven to rotate, and the power is transmitted to the two sun wheel shafts 4;

the sun gear shaft 4 drives the plurality of first planet gears 19 and the plurality of second planet gears 20 to rotate by utilizing the meshing force between the sun gear shaft and the plurality of first planet gears 19; meanwhile, the gear ring 12 is fixed, and the gear ring 12 drives the plurality of first planet gears 19 and the plurality of second planet gears 20 to revolve by using the meshing force between the gear ring 12 and the plurality of second planet gears 20, so that the planet carrier 18 and the driving shaft 11 are driven to rotate, the rapid power transmission is realized, and the power transmission is convenient;

when a vehicle runs, pressure oil is injected into a parking brake oil cavity, the pressure oil pushes a parking brake piston 16 to loosen a friction plate assembly 14, so that a plurality of friction plates and a plurality of separation plates are separated from each other, a return spring 24 is squeezed, parking brake is released, the differential shell 3 can rotate at the moment, power transmission is achieved, and when the vehicle runs, the parking brake oil cavity is filled with the pressure oil all the time;

when a vehicle is braked in the running process, pressure oil is injected into a service brake oil cavity, the friction plate assembly 14 extrudes the friction plate assembly 14 under the action of a service brake piston 15, so that a plurality of friction plates and a plurality of separation plates are tightly attached to realize service braking, and the differential shell 3 cannot rotate at the moment; meanwhile, pressure oil is injected into the differential lock clutch 10, the clutch 10 works, and at the moment, the left half axle gear 8 and the right half axle gear 9 revolve together with the differential shell 3 respectively and cannot rotate, so that braking is realized;

when pressure oil is not injected into the parking brake oil cavity, the friction plate assembly 14 extrudes the friction plate assembly 14 under the elastic force action of the return spring 24, so that the friction plates and the separating plates are tightly attached to realize parking brake, and the differential shell 3 cannot rotate at the moment; when pressure oil is injected into the parking brake oil cavity, the pressure oil pushes the parking brake piston 16 to loosen the friction plate assembly 14, so that the friction plates and the spacers are separated from each other, the return spring 24 is squeezed, parking brake is relieved, the differential shell 3 can rotate at the moment, and braking is convenient.

In addition, the parking braking oil port is communicated with one end of a parking braking oil pipe, and the other end of the parking braking oil pipe is used for being connected with oil supply equipment. The parking brake oil cavity is filled with pressure oil from the parking brake oil port through the oil supply equipment and the parking brake oil pipe, and the pressure oil is convenient to fill.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. A drive axle assembly, comprising: the transmission device comprises an input gear shaft (1), a power input gear (2), a differential and two final drivers, wherein the two final drivers are oppositely arranged at two ends of the differential and are respectively in transmission connection with the differential; the power input gear (2) is fixedly sleeved on the differential, the input gear shaft (1) is installed on one side of the differential, meshed with the power input gear (2), and can rotate around the axial direction of the power input gear (2) to drive the power input gear (2) to rotate.

2. The drive axle assembly of claim 1, wherein: the differential comprises a differential shell (3), a differential transmission mechanism and two sun wheel shafts (4), wherein the two sun wheel shafts (4) are arranged oppositely, are respectively perpendicular to the axial direction of the input gear shaft (1) and can respectively rotate around the axial direction of the input gear shaft, and the ends far away from each other are respectively in transmission connection with the two final drivers; the differential mechanism shell (3) is sleeved outside one end, close to each other, of each of the two sun wheel shafts (4) and can rotate around the axial direction of the sun wheel shafts (4), and the power input gear (2) is fixedly sleeved outside the differential mechanism shell (3); the differential transmission mechanism is arranged in the differential shell (3), can rotate along with the differential shell (3), and is in transmission connection with one end, close to each other, of the two sun gear shafts (4).

3. The drive axle assembly of claim 2, wherein: each final transmission comprises a driving shaft (11), a gear ring (12) and a planetary mechanism, each driving shaft (11) is arranged at one end of the corresponding sun gear shaft (4) outside the differential shell (3), is parallel to the sun gear shaft (4) and can rotate around the axial direction of the driving shaft; the gear ring (12) is coaxial and fixedly arranged with the driving shaft (11) and is positioned outside one end, close to the corresponding sun gear shaft (4), of the driving shaft (11); the planetary mechanism is arranged on one end of the driving shaft (11) close to the sun gear shaft (4) and is respectively meshed with the gear ring (12) and the sun gear shaft (4).

4. The drive axle assembly of claim 2, wherein: the differential transmission mechanism comprises a long planet wheel shaft (5) and two short planet wheel shafts (6), the long planet wheel shaft (5) is detachably mounted in the differential shell (3), and a through hole penetrating through the center of the long planet wheel shaft is formed; the two short planet wheel shafts (6) are relatively detachably mounted in the differential shell (3), are respectively vertical to the long planet wheel shaft (5) and are distributed, and the opposite ends of the two short planet wheel shafts respectively penetrate through the two ends of the through hole and extend into the through hole; the long planet wheel shafts (5) are respectively vertical to the axial direction of the sun wheel shaft (4), and two ends of the long planet wheel shafts are respectively sleeved with planet gears (7) through needle bearings in a coaxial rotating mode; one end, close to each other, of each of the two sun gear shafts (4) is respectively and coaxially fixedly sleeved with a left half shaft gear (8) and a right half shaft gear (9), and the left half shaft gear (8) and the right half shaft gear (9) are respectively meshed with the four planetary gears (7).

5. The drive axle assembly of claim 4, wherein: the differential further comprises a clutch (10), said clutch (10) being mounted within said differential case (3) for engaging or disengaging said differential case (3) and said left side gear (8) or said right side gear (9).

6. The drive axle assembly of claim 2 wherein: the brake device is characterized by further comprising an integrated brake, wherein the integrated brake is arranged on one side of the differential case (3), is in transmission connection with the differential case (3) and is used for braking the differential case (3).

7. The drive axle assembly of claim 6, wherein: the integrated brake comprises a brake shell (13), a friction plate assembly (14), a service braking mechanism and a parking braking mechanism, wherein the brake shell (13) is fixedly arranged and is positioned outside one end of the differential shell (3), and one end of the brake shell is provided with an opening which penetrates through the inside and the outside;

the friction plate assembly (14) is installed in the brake shell (13), the inner side of the friction plate assembly is connected with the differential shell (3) through an internal spline, and the outer side of the friction plate assembly is connected with the brake shell (13) through an external spline; the service braking mechanism and the parking braking mechanism are respectively installed in the brake shell (13) and are respectively located at two ends of the friction plate assembly (14), the service braking mechanism is used for extruding or loosening the friction plate assembly (14) to perform service braking, and the parking braking mechanism is used for extruding or loosening the friction plate assembly (14) to perform parking braking.

8. The drive axle assembly of claim 7, wherein: the service brake mechanism comprises a service brake piston (15), wherein the service brake piston (15) is installed at one end in the brake shell (13) and can move back and forth along the direction from one end to the other end of the brake shell (13) to press or release the friction plate assembly (14).

9. The drive axle assembly of claim 7 or 8, wherein: the parking brake mechanism comprises a parking brake piston (16), and the parking brake piston (16) is mounted at the other end in the brake housing (13) and can move back and forth along the direction from one end to the other end of the brake housing (13) to press or release the friction plate assembly (14).

10. A tractor, its characterized in that: comprising a drive axle assembly according to any of claims 1-9.

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