A tractor rear drive axle assembly and a tractor

Abstract

The application discloses a tractor rear drive axle assembly and a tractor, wherein a differential assembly is arranged inside a drive axle housing; a wheel-side reduction gearbox is arranged outside the drive axle housing and is connected with the differential assembly through a half shaft; a wet brake assembly is arranged inside the drive axle housing; a hydraulic electric control system is arranged on the drive axle housing; one end of a precise lubrication system is connected with the hydraulic electric control system, and the other end is connected with the wet brake assembly and the differential assembly respectively; and the drive axle housing is provided with lubricating oil channels connected with the wet brake assembly and the differential assembly. The application adopts modular design and can be independent of a main gearbox of the tractor as a whole, integrates all parts prone to failure outside the housing, and can realize rapid diagnosis and maintenance of failure. The internal vulnerable parts are forced and precisely lubricated, and are matched with splash and immersion lubrication, so that failure caused by poor lubrication of internal parts can be effectively avoided.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, specifically relating to a tractor rear drive axle assembly and the tractor. Background Technology

[0002] There are many technical approaches to tractor powertrain systems, with different manufacturers employing different methods. Existing transmission systems often follow traditional approaches, using an integrated gearbox and rear axle design. This type of powertrain has a single-function rear axle, primarily relying on mechanical transmission and featuring built-in mechanical braking. It cannot achieve functions such as automatic differential locks or precise brake lubrication. The tractor's rear-mounted power take-off (PTO) cannot be integrated into the rear axle, requiring a separate and complex shifting mechanism or hydraulic actuator for PTO gear switching. Since the main load-bearing component of the tractor powertrain is on the rear axle, this integrated axle-gearbox structure cannot be upgraded through modularization when higher horsepower tractors are needed. This leads to increased product development costs, more spare parts, and a higher failure rate. Furthermore, maintenance of an integrated rear axle requires complete disassembly of the powertrain, resulting in low efficiency and often delays work due to long maintenance cycles, potentially causing irreparable damage.

[0003] Patent application CN103552429A, entitled "A Type of Engineering Machinery and Its Drive Axle Assembly," discloses a drive axle assembly comprising an axle housing. Inside the housing are a main reducer, wheel-side reducers, and a half-shaft. The two ends of the half-shaft are connected to the main reducer and the wheel-side reducer, respectively. The assembly also includes a brake for braking the rotation of the half-shaft. When the brake is in braking mode, it brakes the output shaft of the wheel-side reducer. While this drive axle assembly indirectly brakes the half-shaft by directly braking the output shaft of the wheel-side reducer, requiring relatively less braking force, this patent application fails to address the issues of precise braking lubrication and ease of maintenance. Summary of the Invention

[0004] In order to overcome the problems existing in the prior art, the present invention aims to provide a tractor rear drive axle assembly and tractor, which integrates easily damaged components outside the drive axle housing and lubricates the easily damaged internal parts through a precision lubrication system, thereby avoiding failures of internal parts caused by poor lubrication.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A tractor rear drive axle assembly, comprising:

[0007] A drive axle housing, wherein a differential assembly is installed inside the drive axle housing;

[0008] A wheel-side reduction gearbox is disposed outside the drive axle housing and is connected to the differential assembly via a half-shaft;

[0009] A wet brake assembly, wherein the wet brake assembly is disposed inside the drive axle housing;

[0010] The hydraulic and electronic control system is mounted on the drive axle housing;

[0011] A precision lubrication system, one end of which is connected to the hydraulic electronic control system, and the other end of which is connected to the wet brake assembly and the differential assembly respectively;

[0012] The hydraulic electronic control system is connected to a lubrication oil circuit interface and a working oil circuit interface. The precision lubrication system includes a lubrication oil pipe connected to the lubrication oil circuit interface through the hydraulic electronic control system and a working oil pipe connected to the working oil circuit interface through the hydraulic electronic control system. The drive axle housing is provided with lubrication oil passages that connect to the wet brake assembly and the differential assembly.

[0013] Optionally, a power take-off (PTO) assembly is provided inside the drive axle housing, and the PTO assembly is connected to a PTO connecting shaft.

[0014] Optionally, the precision lubrication system includes a power take-off (PTO) clutch working oil pipe and a PTO clutch lubrication oil pipe; the PTO assembly includes a PTO housing and a PTO clutch, the PTO housing is provided with an oil passage leading to the PTO clutch, one end of the PTO clutch working oil pipe is connected to the hydraulic electronic control system, and the other end is connected to the oil passage of the PTO housing; one end of the PTO clutch lubrication oil pipe is connected to the hydraulic electronic control system, and the other end is connected to the PTO assembly.

[0015] Optionally, the tractor rear drive axle assembly also includes a lifting system, which includes a brake lever, a lifting arm, a support body, and a parking brake lateral tie rod. There are two support bodies connected by the parking brake lateral tie rod. The support bodies are located on the top outer side of the drive axle housing. The lifting arm and the parking brake lateral tie rod are both mounted on the support bodies. The end of the brake lever is connected to the lifting arm, and the end of the lifting arm has a through hole. The end of the brake lever passes through the through hole of the lifting arm and is fitted with an adjusting nut.

[0016] Optionally, the wet brake assembly includes a friction pad assembly, a brake rocker arm, a brake cylinder, and a brake; the brake rocker arm is connected to the end of the parking brake lateral linkage; the brake cylinder is connected to the bottom of the parking brake lateral linkage; the bottom of the brake cylinder is connected to the brake via a piston; the friction pad assembly includes a friction pad and a mating pad; the friction pad is sleeved on the half-shaft via a spline; the mating pad is hung on a boss inside the drive axle housing; the brake is disposed between the friction pad and the mating pad; and the brake is connected to the half-shaft.

[0017] Optionally, a rocker arm is provided on the brake cylinder, and the end of the parking brake lever is connected to the rocker arm by a pin.

[0018] Optionally, the hydraulic system uses a multi-compression fitting tubing assembly for connection.

[0019] Optionally, the hydraulic electronic control system includes a rear axle main valve plate assembly, on which a brake lubrication oil pipe assembly is connected, and the other end of the brake lubrication oil pipe assembly is connected to a brake lubrication oil passage on the drive axle housing.

[0020] Optionally, the hydraulic electronic control system further includes a power take-off valve plate assembly, and the precision lubrication system includes a power take-off gear position oil pipe; the power take-off gear position oil pipe is connected to the rear axle main valve plate assembly, and the other end of the power take-off gear position oil pipe is connected to the power take-off valve plate assembly; the power take-off valve plate assembly is connected to the brake lubrication oil passage of the drive axle housing.

[0021] A tractor, including the aforementioned tractor rear drive axle assembly.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention employs a modular design, including a wheel-side reduction gearbox, a wet brake assembly, a hydraulic electronic control system, and a precision lubrication system. It can operate independently of the tractor's main gearbox and is compatible with CVT, power shift transmissions, hybrid powertrains, and other tractor powertrains, offering excellent interchangeability. This invention integrates all fault-prone parts externally. Forced and precise lubrication control is used for internal wear parts, combined with splash and immersion lubrication, effectively preventing malfunctions caused by poor lubrication, reducing the probability of disassembly for repair, and improving the reliability of the assembly. Each component allows for rapid fault diagnosis and repair, and can be updated and iterated as needed, minimizing operating costs.

[0024] Furthermore, the present invention provides a power take-off assembly, which facilitates power output, and supplies oil to the working oil pipe and lubrication oil pipe of the power take-off clutch through a precision lubrication system, which facilitates the modular installation of the power take-off assembly.

[0025] Furthermore, the hydraulic system of this invention uses a multi-tube compression fitting assembly, which reduces the machining of long oil passages inside the housing and lowers costs. When a fault occurs, the corresponding oil circuit can be quickly located through diagnostic results for fault repair. Attached Figure Description

[0026] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings:

[0027] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0028] Figure 2 This is a longitudinal cross-sectional view of the drive axle of the present invention;

[0029] Figure 3 This refers to the external structure of the rear axle of the present invention;

[0030] Among them, 1-drive axle housing, 2-differential assembly, 3-half shaft, 4-gear ring, 5-planetary gear set assembly, 6-wheel-side housing, 7-first bearing, 8-second bearing, 9-wheel-side output shaft, 10-box-type oil seal, 11-oil seal, 12-brake cover, 13-friction pad assembly, 14-rocker arm, 15-parking brake rocker arm, 16-left support, 17-right support, 18-brake, 19-parking brake lateral tie rod, 20-right support, 21-front end cover, 22-oil seal seat, 23-needle roller bearing, 24-oil seal, 25-input shaft, 26-bearing, 27-adjusting shim, 28-lubricating oil pipe assembly, 29-power take-off connection 30-Brake lever, 31-Adjusting nut, 32-Lifting arm, 33-Power take-off assembly, 34-Rear axle main valve plate assembly, 35-Power take-off valve plate assembly, 36-Power take-off clutch working oil pipe, 37-Positioning pin, 38-Power take-off clutch lubrication oil pipe, 39-Brake lubrication oil pipe assembly, 40-Differential lock working oil pipe, 41-Differential assembly lubrication oil pipe, 42-First power take-off gear position oil pipe, 43-Second power take-off gear position oil pipe, 44-Break plug, A-Lubrication oil circuit interface, B-Working oil circuit interface, C-Front axle differential lock working oil circuit interface, D-Drive axle oil inlet, E-Hydraulic system return port. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0032] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] The present invention will now be described in detail with reference to the accompanying drawings.

[0035] like Figure 1 As shown, a tractor rear drive axle assembly of the present invention includes a differential assembly 2 disposed in a drive axle housing 1. The differential assembly 2 is mounted on the drive axle housing 1 via a tapered bearing. The differential assembly 2 includes a half-shaft gear, a driven gear, and a differential gear. The differential gear is fixed to the driven gear, and the half-shaft gear meshes with the differential gear.

[0036] The differential assembly 2 has a half-shaft gear connected to a half-shaft 3 via a spline. The half-shaft 3 transmits power to a wheel-side reduction gearbox X located outside the drive axle housing 1. Preferably, there are two half-shafts 3, respectively located at both ends of the differential assembly 2, and each is connected to a wheel-side reduction gearbox X. The differential assembly 2 has a built-in differential lock.

[0037] The wheel-side reduction gearbox X includes a wheel-side housing 6 and an output shaft 9 disposed inside the wheel-side housing 6. Optionally, the output shaft 9 is a continuously variable output shaft. A box-type oil seal 10 is provided at the connection between the output shaft 9 and the wheel-side housing 6 to prevent mud and water from entering the wheel-side reduction gearbox.

[0038] The end of the half-shaft 3 connected to the wheel-side reduction gearbox X is fitted with a planetary carrier assembly 5, which is disposed inside the wheel-side reduction gearbox X. The end of the output shaft 9 is connected to the end of the half-shaft 3 via the planetary carrier assembly 5. A gear ring 4 is connected to the planetary carrier assembly 5, and the gear ring 4 is disposed between the wheel-side housing 6 and the drive axle housing 1. A first bearing 7 and a second bearing 8 are disposed inside the wheel-side housing 6. Both the first bearing 7 and the second bearing 8 are tapered bearings. The first bearing 7 and the second bearing 8 are respectively fitted at different axial positions on the output shaft 9.

[0039] Optionally, the half-shaft 3 is a floating structure, and the half-shaft 3 meshes with the half-shaft gear. By designing a reasonable floating amount, the failure rate of the planetary carrier assembly 5 can be reduced.

[0040] The power is reduced and increased in torque by the planetary carrier assembly 5 and then transmitted to the wheel via the wheel-side output shaft 9.

[0041] A support body is provided on the drive axle housing 1, the support body including a left support 16 and a right support 20. The left support 16 and the right support 20 are respectively fixed to both ends of the top plate of the drive axle housing 1. Both the left support 16 and the right support 20 have through holes. The through holes of the left support 16 and the right support 20 are connected by a parking brake lateral tie rod 19, one end of which is connected to a brake rocker arm 15 by a cylindrical pin. Both ends of the parking brake lateral tie rod 19 are connected to brake cylinders 17, and the bottom of each brake cylinder 17 is connected to a brake 18.

[0042] The drive axle housing 1 is provided with two positioning pins 37. The lifting system is positioned by the two positioning pins 37 and the drive axle housing 1. The left and right supports can be adjusted individually by the positioning pins 37 to reduce braking and lifting resistance caused by errors.

[0043] A brake lever 30 is provided on the top plate of the drive axle housing 1. One end of the brake lever 30 is connected to a lifting arm 32. The end of the lifting arm 32 has a through hole. The end of the brake lever 30 passes through the through hole of the lifting arm 32 and is fitted with an adjusting nut 31 for adjusting the position of the parking brake lever 30. A rocker arm 14 is provided on the brake cylinder 17. One end of the parking brake lever 30 is connected to the rocker arm 14 by a pin, and the other end is connected to the parking brake transverse lever 19. Both the lifting arm 32 and the parking brake transverse lever 19 are mounted on the support body and can rotate around the support body.

[0044] The brake rocker arm 15 is connected to the in-vehicle flexible shaft system. Pulling the brake rocker arm 15 through the flexible shaft system can pull the parking brake lever 30 to operate the brake cylinder and achieve parking braking. One end of the flexible shaft system is connected to the handbrake system inside the tractor cab, and the other end is connected to the brake rocker arm 15. When the driver operates the handbrake lever, the force is transmitted to the brake rocker arm 15 through the flexible shaft, thereby braking the rear axle.

[0045] The drive axle housing 1 houses a friction plate assembly 13, which includes friction plates and mating plates. The friction plates are splined onto the half-shaft 3, and the mating plates are mounted on a boss inside the drive axle housing 1. A brake 18 is positioned between the friction plates and the mating plates, and is splined onto the half-shaft 3. A brake cylinder 17 is located outside the drive axle housing 1, connected to the top of the brake 18 via a piston. The brake cylinder 17 applies braking force to the brake 18 via the piston. The brake 18 applies braking force to both the friction plate assembly 13 and the half-shaft 3, thus achieving the braking function. The tops of both brake cylinders 17 extend beyond the top plate of the drive axle housing 1. The differential lock of the differential assembly 2 adopts a multi-plate wet clutch structure. The differential lock of the differential assembly 2 is connected to the rear axle main valve plate assembly 34 through the differential lock working oil pipe 40 on the drive axle housing 1. The working oil enters the differential lock through electro-hydraulic control to push the differential lock piston, so that the friction plate and the mating plate are engaged to realize the differential lock function and improve the vehicle's ability to pass under bad road conditions.

[0046] Brake covers 12 are provided at both ends of the drive axle housing 1 along the axial direction of the half-shaft 3. Each brake cover 12 has a through hole, and an oil seal 11 is installed in the through hole of the brake cover 12. The half-shaft 3 passes through the through hole of the brake cover 12, and the oil seal 11 is sleeved on the outside of the half-shaft 3. The oil seal 11 separates the drive axle housing 1 and the wheel-side reduction gearbox X into separate independent spaces. The wheel-side reduction gearbox X is filled with gear oil separately, using splash and immersion lubrication.

[0047] like Figure 2 As shown, the driven gear of the differential assembly 2 is meshed with an input shaft 25, and the other end of the input shaft 25 extends out of the front cover 21. Power is transmitted to the rear axle differential assembly 2 through the input shaft 25.

[0048] The drive axle housing 1 is provided with a power take-off assembly 33, and the power take-off assembly 33 is connected to a power take-off connecting shaft 29 via a spline.

[0049] The front end cover 21 is disposed on the side of the drive axle housing 1. An oil seal seat 22 is installed on the front end cover 21. An oil seal 24 is installed on the oil seal seat 22. The oil seal 24 is sleeved on the outside of the power take-off connecting shaft 29 and the input shaft 25.

[0050] The front end cover 21 has a connecting shaft through hole and an input shaft through hole. One end of the power take-off connecting shaft 29 extends out of the drive axle housing 1 through the connecting shaft through hole, and the input shaft 25 extends out of the drive axle housing 1 through the input shaft through hole.

[0051] A bearing 26 and an adjusting shim 27 are provided in the through hole of the input shaft. The inner ring of the bearing 26 is sleeved on the outside of the input shaft 25, and the outer side of the bearing 26 is installed in the through hole of the input shaft.

[0052] like Figure 3 As shown, the top plate of the drive axle housing 1 is provided with a rear axle main valve plate assembly 34 and a power take-off valve plate assembly 35 (i.e., PTO valve plate assembly).

[0053] The top plate of the drive axle housing 1 is provided with a lubrication oil circuit interface A and a working oil circuit interface B. The rear axle main valve plate assembly 34 is connected to both the lubrication oil circuit interface A and the working oil circuit interface B. Lubricating oil and working oil with a certain pressure enter the rear axle main valve plate assembly 34 through the lubrication oil circuit interface A and the working oil circuit interface B on the drive axle housing 1, respectively. The rear axle main valve plate assembly 34 can distribute hydraulic oil through the control system. The drive axle housing 1 is provided with a front axle differential lock working oil circuit interface C. The front axle differential lock working oil circuit interface C is a three-way interface, one end of which is connected to the differential lock working oil pipe 40, and the other end is reserved as an external interface to provide lubricating oil to the front axle differential lock working oil circuit. The upper side of the drive axle housing 1 is provided with a drive axle oil inlet D, which is connected to the interior of the drive axle housing 1. The upper part of the drive axle housing 1 is provided with a hydraulic system return port E, which is connected to the bottom of the drive axle housing 1 through an oil pipe.

[0054] The half-shaft 3, brake cover 12 and drive axle housing 1 are all provided with interconnected brake lubrication oil passages. The rear axle main valve plate assembly 34 is provided with a brake lubrication oil pipe assembly 39. One end of the brake lubrication oil pipe assembly 39 is connected to the rear axle main valve plate assembly 34, and the other end is connected to the brake lubrication oil passages on the drive axle housing 1 and the brake lubrication oil passages on the brake cover 12 through a three-way valve.

[0055] A hydraulic system is installed on the rear axle main valve plate assembly 34. This hydraulic system includes interconnected differential lock solenoid valves, brake check valves, power take-off (PTO) gear position solenoid valves, and PTO clutch solenoid valves. The hydraulic system is connected to the rear axle main valve plate assembly 34 via fasteners. The differential lock solenoid valve controls the oil circuit. When a braking signal is generated, the brake check valve on the rear axle main valve plate assembly 34 opens, allowing lubricating oil to enter the internal lubrication channel via the brake lubrication oil pipe assembly 39 to lubricate the braking system. When the braking signal stops, the lubrication check valve closes, and no more lubricating oil enters the lubrication channel, reducing drag loss of the friction pads and improving transmission efficiency. The rear axle main valve plate assembly 34 is connected to the brake lubrication oil pipe assembly 39, which is a three-way pipe. The other two ends of the brake lubrication oil pipe assembly 39 are connected to the brake oil passages on both sides of the drive axle housing 1.

[0056] The hydraulic system uses multiple compression fittings for connection, which reduces the machining of long oil passages inside the housing and lowers costs. When a fault occurs, the corresponding oil circuit can be quickly located based on diagnostic results for troubleshooting.

[0057] The rear axle main valve plate assembly 34 is connected to a power take-off clutch working oil pipe 36, and the other end of the power take-off clutch working oil pipe 36 is connected to the drive axle housing 1.

[0058] The rear axle main valve plate assembly 34 is connected to a power take-off clutch lubrication oil pipe 38, and the other end of the power take-off clutch lubrication oil pipe 38 is connected to the power take-off assembly 33.

[0059] The rear axle main valve plate assembly 34 is connected to a differential working oil pipe 40, and the other end of the differential working oil pipe 40 is connected to the drive axle housing 1.

[0060] The rear axle main valve plate assembly 34 is connected to a differential assembly lubrication oil pipe 41, and the other end of the differential assembly lubrication oil pipe 41 is connected to the drive axle housing 1.

[0061] The rear axle main valve plate assembly 34 is connected to a first power take-off (PTO) gear position oil pipe 42 and a second PTO gear position oil pipe 43. The other end of the first PTO gear position oil pipe 42 is connected to the PTO valve plate assembly 35. The second PTO gear position oil pipe 43 is connected to the drive axle housing 1.

[0062] Unless otherwise specified, the equipment components involved in the above embodiments are all conventional equipment components, and the structural settings, working methods or control methods involved are all conventional settings, working methods or control methods in the art unless otherwise specified.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A tractor rear drive axle assembly, characterized in that, include: Drive axle housing (1), inside which a differential assembly (2) is installed; Wheel-side reduction gearbox (X), the wheel-side reduction gearbox (X) is disposed outside the drive axle housing (1), and the wheel-side reduction gearbox (X) is connected to the differential assembly (2) via a half shaft (3); A wet brake assembly is disposed inside the drive axle housing (1); A hydraulic and electronic control system is mounted on the drive axle housing (1); A precision lubrication system, one end of which is connected to the hydraulic and electronic control system, and the other end of which is connected to the wet brake assembly and the differential assembly (2) respectively; The hydraulic electronic control system is connected to a lubrication oil circuit interface (A) and a working oil circuit interface (B). The precision lubrication system includes a lubrication oil pipe connected to the lubrication oil circuit interface (A) through the hydraulic electronic control system and a working oil pipe connected to the working oil circuit interface (B) through the hydraulic electronic control system. The drive axle housing (1) is provided with a lubrication oil passage that connects to the wet brake assembly and the differential assembly.

2. The tractor rear drive axle assembly according to claim 1, characterized in that, The drive axle housing (1) is provided with a power take-off assembly (33), and the power take-off assembly (33) is connected to a power take-off connecting shaft (29).

3. A tractor rear drive axle assembly according to claim 2, characterized in that, The precision lubrication system includes a power take-off clutch working oil pipe (36) and a power take-off clutch lubrication oil pipe (38); the power take-off assembly (33) includes a power take-off housing and a power take-off clutch, the power take-off housing is provided with an oil passage leading to the power take-off clutch, one end of the power take-off clutch working oil pipe (36) is connected to the hydraulic electronic control system, and the other end is connected to the oil passage of the power take-off housing; one end of the power take-off clutch lubrication oil pipe (38) is connected to the hydraulic electronic control system, and the other end is connected to the power take-off assembly (33).

4. A tractor rear drive axle assembly according to claim 1, characterized in that, The tractor rear drive axle assembly also includes a lifting system, which includes a brake lever (30), a lifting arm (32), a support body, and a parking brake lateral lever (19). There are two supports connected by the parking brake lateral lever (19). The supports are located on the top of the outer side of the drive axle housing (1). The lifting arm (32) and the parking brake lateral lever (19) are both located on the supports. The end of the brake lever (30) is connected to the lifting arm (32). The end of the lifting arm (32) has a through hole. The end of the brake lever (30) passes through the through hole of the lifting arm (32) and is fitted with an adjusting nut (31).

5. A tractor rear drive axle assembly according to claim 4, characterized in that, The wet brake assembly includes a friction pad assembly (13), a brake rocker arm (15), a brake cylinder (17), and a brake (18); the brake rocker arm (15) is connected to the end of the parking brake lateral tie rod (19); the brake cylinder (17) is connected to the bottom of the parking brake lateral tie rod (19); the bottom of the brake cylinder (17) is connected to the brake (18) via a piston; the friction pad assembly (13) includes a friction pad and a mating pad; the friction pad is sleeved on the half shaft (3) via a spline; the mating pad is hung on a boss inside the drive axle housing (1); the brake (18) is disposed between the friction pad and the mating pad; the brake (18) is connected to the half shaft (3) via a spline.

6. A tractor rear drive axle assembly according to claim 5, characterized in that, A rocker arm (14) is provided on the brake cylinder (17), and the end of the brake lever (30) is connected to the rocker arm (14) by a pin.

7. A tractor rear drive axle assembly according to claim 1, characterized in that, The hydraulic control system includes a rear axle main valve plate assembly (34), on which a brake lubrication oil pipe assembly (39) is connected, and the other end of the brake lubrication oil pipe assembly (39) is connected to the brake lubrication oil passage on the drive axle housing (1).

8. A tractor rear drive axle assembly according to claim 7, characterized in that, The rear axle main valve plate assembly (34) is equipped with a hydraulic system, which is connected by a multi-compression fitting oil pipe assembly.

9. A tractor rear drive axle assembly according to claim 7, characterized in that, The hydraulic control system also includes a power take-off valve plate assembly (35), and the precision lubrication system includes a power take-off gear position oil pipe; the power take-off gear position oil pipe is connected to the rear axle main valve plate assembly (34), and the other end of the power take-off gear position oil pipe is connected to the power take-off valve plate assembly (35); the power take-off valve plate assembly (35) is connected to the brake lubrication oil passage of the drive axle housing (1).

10. A tractor, characterized in that, Includes a tractor rear drive axle assembly as described in any one of claims 1-9.

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