Harvesting machinery transmission structure integrating drive axle and transmission case

Abstract

A harvesting machinery transmission structure integrating a drive axle and a transmission case belongs to the field of agricultural machinery and comprises a rear axle, an electric control four-hole vertical box, a first transmission shaft, a bearing seat, a second transmission shaft, an L-shaped electric control four-hole box, a front box and a hydraulic motor. The rear axle is connected with the electric control four-hole vertical box, the electric control four-hole vertical box is connected with the first transmission shaft, the first transmission shaft is connected with the bearing seat, the bearing seat is connected with the second transmission shaft, the second transmission shaft is connected with the L-shaped electric control four-hole box, the L-shaped electric control four-hole box is connected with the front box, and the front box is connected with the hydraulic motor through a motor support bolt. Compared with a traditional harvesting machine, the transmission structure is more compact, the weight of the whole machine is reduced, stable transition from two-wheel drive to four-wheel drive is achieved, the torque transmission direction is changed, the reliability and stability of a transmission system are improved, and the adaptability and operation capacity of the harvesting machine in different regions in China are enhanced. And the conventional use requirements of non-road vehicles under complex and severe working conditions are met.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural machinery and relates to a transmission structure for a harvester, and more particularly to a transmission structure for a harvester in which the drive axle and the transmission box are integrated. Background Technology

[0002] In recent years, harvesting machinery, as an important component of my country's agricultural machinery, has experienced rapid development in the process of agricultural modernization. The drive axle of harvesting machinery is responsible for transmitting power to the drive wheels. Key design considerations for the drive axle include axle housing weight, steering mechanism, steering control, braking, and end-load deceleration. For off-road vehicles such as tractors and harvesting machinery, due to the nature of their work and the complex and harsh operating conditions, reducing the weight of the main unit and improving its performance are also important aspects of technological innovation.

[0003] In recent years, the integrated drive axle and transmission structure (also known as an integrated electric drive axle or integrated drive axle), pioneered in the field of road vehicles, is a design that highly integrates the drive axle (including the main reducer, differential, half shafts, etc.) with the transmission (such as a reducer or gearbox), and is applied to new energy vehicles (such as pure electric and hybrid vehicles). This structure represents a significant step towards achieving the goals of lightweighting, low noise, high reliability, and low cost by reducing independent components, optimizing space layout, and improving system efficiency.

[0004] The State Intellectual Property Office of China published an invention patent application on August 1, 2025, with application number 2024113982717, publication number CN 120396557 A, and application date of September 30, 2024. This patent application discloses an "electric drive axle assembly and vehicle," comprising: an axle housing, a reducer housing, and a fastening strip; the axle housing has an installation channel extending along a first direction; the reducer housing is installed within the installation channel along the first direction; the fastening strip is installed outside the reducer housing; the fastening strip, axle housing, and reducer housing are connected by a first connecting member extending along the first direction, and the fastening strip and the reducer housing are connected by a second connecting member extending along a second direction. This electric drive axle assembly reduces the problems of easy loosening of the connecting members between the axle housing and the reducer housing under alternating loads and the relative misalignment of the mating surfaces of the axle housing and the reducer housing.

[0005] Based on the above, and through research on the current agricultural machinery market demand and analysis of existing technologies, and in order to better meet the needs of non-road vehicles for routine use under complex and harsh working conditions, and considering the regional characteristics of my country and the skill level of most machine operators, a harvesting machinery transmission structure integrating a drive axle and transmission box has been designed and developed through testing. This structure is compact, easy to operate, has flexible braking, and is lightweight. Utility Model Content

[0006] The purpose of this utility model is to provide a harvesting machinery transmission structure that integrates the drive axle and transmission box, which is compact, easy to operate, convenient to brake, lightweight, and suitable for use in non-road vehicle conventional operating conditions.

[0007] This utility model can achieve the above-mentioned objectives through the following technical solution: A harvesting machinery transmission structure integrating the drive axle and transmission box, comprising: a rear axle, an electrically controlled four-hole vertical box, a first drive shaft, a bearing seat, a second drive shaft 5, an L-shaped electrically controlled four-hole box, a front box, and a hydraulic motor; the rear axle is connected to the electrically controlled four-hole vertical box by bolts, the electrically controlled four-hole vertical box is connected to the first drive shaft by flange bolts, the first drive shaft is connected to the bearing seat by flange bolts, the bearing seat is connected to the second drive shaft by flange bolts, the second drive shaft is connected to the L-shaped electrically controlled four-hole box by flange bolts, the L-shaped electrically controlled four-hole box is connected to the front box by connecting disc bolts, and the front box is connected to the hydraulic motor by motor support bolts.

[0008] The rear axle includes: a left wheel-side assembly, a long driveshaft assembly, a cylinder assembly, a tie rod assembly, a long half-shaft housing, a central housing, a central assembly, a short driveshaft assembly, a short half-shaft housing, a right wheel-side assembly, a left steering knuckle, and a right steering knuckle; the left wheel-side assembly and the right wheel-side assembly are located at the left and right ends of the rear axle, respectively; the long driveshaft assembly is connected to the left wheel-side assembly; one end of the cylinder assembly is connected to the left steering knuckle of the left wheel-side assembly, and the other end of the cylinder assembly is connected to the long half-shaft housing; one end of the central housing is connected to the long half-shaft housing, and the other end of the central housing is connected to the short half-shaft housing; the central assembly is connected to the central housing; the short driveshaft assembly is connected to the right wheel-side assembly; one end of the tie rod assembly is connected to the left steering knuckle, and the other end of the tie rod assembly is connected to the right steering knuckle.

[0009] The electrically controlled four-hole vertical box includes: a connecting seat, a first spur gear shaft assembly, a second spur gear shaft assembly, an electrical control device, a third spur gear shaft assembly, a box flange, a fourth spur gear shaft assembly, and a box housing; the connecting seat is fixedly installed on the box housing by bolts; the first spur gear shaft assembly, the second spur gear shaft assembly, the third spur gear shaft assembly, and the fourth spur gear shaft assembly are sequentially installed inside the box housing; part of the electrical control device is internally mounted on the shaft of the first spur gear shaft assembly, and the other part is externally mounted on the box housing; the box flange is connected to the shaft of the fourth spur gear shaft assembly via an internal spline.

[0010] The L-shaped electrically controlled four-hole box includes: a four-hole box flange, a bevel gear shaft assembly, an electric actuator, a bevel and spur gear shaft assembly, a fifth spur gear shaft assembly, a sixth spur gear shaft assembly, a seventh spur gear shaft assembly, a four-hole box housing, and a connecting plate. At one end of the four-hole box housing, the four-hole box flange is connected to the shaft of the bevel gear shaft assembly via a spline. The bevel gear shaft assembly, the bevel and spur gear shaft assembly, the fifth spur gear shaft assembly, the sixth spur gear shaft assembly, and the seventh spur gear shaft assembly are sequentially installed inside the four-hole box housing. Part of the electric actuator is internally mounted on the shaft of the bevel and spur gear shaft assembly, and the other part is externally mounted on the four-hole box housing. A connecting plate is installed at the other end of the four-hole box housing.

[0011] The connecting plate on the L-shaped four-hole electrical control box is connected to the front box via connecting plate bolts, and the front box is connected to the hydraulic motor via motor support bolts.

[0012] The beneficial effects achieved by this utility model after adopting the above technical solution are as follows: Compared with the traditional transmission structure of harvesting machinery, this utility model has a more compact structure, significantly reduces the weight of the whole machine, is easier to operate, realizes the upgrade from two-wheel drive to four-wheel drive, strengthens the power under working conditions, and is suitable for the power requirements of harsh working conditions. It changes the direction of torque transmission. Especially during relocation, the L-shaped four-hole box and the four-hole vertical box are disengaged from the power source, avoiding vibration, high temperature, and noise caused by high-speed operation. It achieves a smooth transition from two-wheel drive to four-wheel drive, changes the direction of torque transmission, improves the reliability and stability of the transmission system, and enhances the adaptability and operational capabilities of harvesting machinery in different regions of my country. It meets the needs of non-road vehicles for routine use in complex and harsh working conditions, adapting to the regional characteristics of my country and the operating skills of most machine operators. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the transmission structure of a harvesting machine that integrates a drive axle and a transmission box according to the present invention.

[0014] Figure 2 This is a schematic diagram of the rear axle structure of a harvesting machinery transmission structure that integrates the drive axle and the transmission box, according to this utility model.

[0015] Figure 3 This is a schematic diagram of an electrically controlled four-hole vertical box structure for a harvesting machinery transmission structure that integrates a drive axle and a transmission box, according to the present invention.

[0016] Figure 4 This is a schematic diagram of an L-shaped electrically controlled four-hole box structure for a harvesting machinery transmission structure that integrates a drive axle and a transmission box, according to the present invention.

[0017] Figure 5 This is a schematic diagram of the electrical control device in the electrically controlled four-hole vertical box of a harvesting machinery transmission structure that integrates a drive axle and a transmission box, according to this utility model.

[0018] Figure 6 for Figure 5 DD section view.

[0019] Figure 7 This is a schematic diagram of the electric device structure in the L-shaped electrically controlled four-hole box of the harvesting machinery transmission structure that integrates the drive axle and the transmission box according to this utility model.

[0020] Figure 8 for Figure 7 BB cross-sectional view.

[0021] In the diagram: 1. Rear axle, 2. Electrically controlled four-hole box, 3. First drive shaft, 4. Bearing housing, 5. Second drive shaft, 6. L-shaped electrically controlled four-hole box, 7. Front box, 8. Hydraulic motor;

[0022] 1-1. Left wheel assembly; 1-2. Long drive shaft assembly; 1-3. Hydraulic cylinder assembly; 1-4. Tie rod assembly; 1-5. Long half-shaft housing; 1-6. Central housing; 1-7. Central assembly; 1-8. Short drive shaft assembly; 1-9. Short half-shaft housing; 1-10. Right wheel assembly; 1-1-1. Left steering knuckle; 1-10-1. Right steering knuckle; 2-1. Connecting seat; 2-2. First spur gear shaft assembly; 2-3. Second spur gear shaft assembly; 2-4. Electrical control device; 2-5. Third spur gear shaft assembly; 2-6. Vertical box flange; 2- 7. Fourth spur gear shaft assembly; 2-8. Vertical housing; 2-4-1. First electric push rod; 2-4-2. First connecting plate; 2-4-3. First paddle; 2-4-4. First paddle shaft; 2-4-5. First paddle fork; 2-4-6. First meshing sleeve; 6-1. Four-hole housing flange; 6-2. Bevel gear shaft assembly; 6-3. Electric actuator; 6-4. Bevel and spur gear shaft assembly; 6-5. Fifth spur gear shaft assembly; 6-6. Sixth spur gear shaft assembly; 6-7. Seventh spur gear shaft assembly; 6-8. Four-hole housing; 6-9. Connecting plate; 6-3-1. Second electric push rod; 6-3-2. Second connecting plate; 6-3-3. Second paddle; 6-3-4. Second paddle shaft; 6-3-5. Second paddle fork; 6-3-6. Second meshing sleeve. Detailed Implementation

[0023] [The present invention will be further described below with reference to the accompanying drawings and embodiments: such as] Figure 1-8As shown, a harvesting machinery transmission structure integrating the drive axle and transmission box mainly includes: a rear axle 1, an electrically controlled four-hole vertical box 2, a first drive shaft 3, a bearing housing 4, a second drive shaft 5, an L-shaped electrically controlled four-hole box 6, a front box 7, and a hydraulic motor 8. The most important components of this transmission structure are the rear axle 1, the electrically controlled four-hole vertical box 2, the L-shaped electrically controlled four-hole box 6, and the front box 7, which are connected as a whole by the first drive shaft 3 and the second drive shaft 5. The overall connection method is as follows: the rear axle 1 is connected to the electrically controlled four-hole vertical box 2 by bolts; the electrically controlled four-hole vertical box 2 is connected to the first drive shaft 3 by flange bolts; the first drive shaft 3 is connected to the bearing housing 4 by flange bolts; the bearing housing 4 is connected to the second drive shaft 5 by flange bolts; the second drive shaft 5 is connected to the L-shaped electrically controlled four-hole box 6 by flange bolts; the connecting discs 6-9 on the L-shaped electrically controlled four-hole box 6 are connected to the front box 7 by connecting disc bolts; and the front box 7 is connected to the hydraulic motor 8 by motor support bolts. The transmission connection is as follows: the drive shaft inside the connecting seat on the central assembly 1-7 of the rear axle 1 is connected to the shaft of the first spur gear shaft assembly 2-2 inside the connecting seat 2-1 on the four-hole vertical box 2. The shaft of the first spur gear shaft assembly 2-2 is sequentially connected to the second spur gear shaft assembly 2-3, the third spur gear shaft assembly 2-5, and the fourth spur gear shaft assembly 2-7. The shaft in the fourth spur gear shaft assembly 2-7 is sequentially connected to the first drive shaft 3 and the bearing through the vertical box flange 2-6 connected to it by a spline. Seat 4, second drive shaft 5, L-shaped electric control four-hole box 6, four-hole box flange 6-1 connected to the shaft spline of bevel gear shaft assembly 6-2, L-shaped electric control four-hole box 6, four-hole box flange 6-1 connected to the shaft spline of bevel gear shaft assembly 6-2, sequentially drive bevel gear shaft assembly 6-2, bevel and spur gear shaft assembly 6-4, fifth spur gear shaft assembly 6-5, sixth spur gear shaft assembly 6-6, seventh spur gear shaft assembly 6-7, the shaft of the seventh spur gear shaft assembly 6-7 is connected to the transmission inside the front box 7.

[0024] In the rear axle 1, the left wheel side assembly 1-1 and the right wheel side assembly 1-10 are respectively installed at the left and right ends of the rear axle 1. The long drive shaft assembly 1-2 is connected to the left wheel side assembly 1-1. The left end of the hydraulic cylinder assembly 1-3 is connected to the left steering knuckle 1-1-1 of the left wheel side assembly 1-1, and the right end of the hydraulic cylinder assembly 1-3 is connected to the long half-shaft housing 1-5. The left end of the central housing 1-6 is connected to the long half-shaft housing 1-5, and the right end of the central housing 1-6 is connected to the short half-shaft housing 1-9. The central assembly 1-7 is connected to the central housing 1-6. The short drive shaft assembly 1-8 is connected to the right wheel side assembly 1-10. The left end of the tie rod assembly 1-4 is connected to the left steering knuckle 1-1-1, and the right end of the tie rod assembly 1-4 is connected to the right steering knuckle 1-10-1.

[0025] In the electrically controlled four-hole vertical box 2, the connecting seat 2-1 is fixedly installed on the vertical box housing 2-8 by bolts. The first spur gear shaft assembly 2-2, the second spur gear shaft assembly 2-3, the third spur gear shaft assembly 2-5, and the fourth spur gear shaft assembly 2-7 are sequentially connected and installed inside the vertical box housing 2-8. Part of the electrical control device 2-4 is installed on the shaft in the first spur gear shaft assembly 2-2, and the other part is installed on the vertical box housing 2-8. The vertical box flange 2-6 is connected to the shaft in the fourth spur gear shaft assembly 2-7 through an internal spline.

[0026] In the L-shaped four-hole electrical control box 6, at one end of the four-hole box housing 6-8, the four-hole box flange 6-1 is connected to the shaft of the bevel gear shaft assembly 6-2 via a spline. Inside the four-hole box housing 6-8, the bevel gear shaft assembly 6-2, the bevel and spur gear shaft assembly 6-4, the fifth spur gear shaft assembly 6-5, the sixth spur gear shaft assembly 6-6, and the seventh spur gear shaft assembly 6-7 are sequentially connected and installed. Part of the electric device 6-3 is internally mounted on the shaft in the bevel and spur gear shaft assembly 6-4, and the other part is externally mounted on the four-hole box housing 6-8. A connecting plate 6-9 is installed at the other end of the four-hole box housing 6-8.

[0027] The electrical control device 2-4, which is externally mounted on the upper part of the upright housing 2-8, is equipped with a first electric push rod 2-4-1. The first electric push rod 2-4-1 is movably connected to the first connecting plate 2-4-2 by screws and locking nuts. The first connecting plate 2-4-2 moves the first paddle 2-4-3 and the first paddle shaft 2-4-4 through a pin and inserts into the upright housing 2-8. The first paddle 2-4-3 is fixedly connected to the first paddle shaft 2-4-4 by an elastic cylindrical pin. The first paddle shaft 2-4-4 in the electrical control device 2-4 is fixedly connected to the first paddle fork 2-4-5 by a flat key and screws. The first paddle fork 2-4-5 is engaged in the groove of the first engagement sleeve 2-4-6.

[0028] The electric actuator 6-3, which is externally mounted on the upper part of the four-hole housing 6-8, is equipped with a second electric push rod 6-3-1. The second electric push rod 6-3-1 is connected to the second connecting plate 6-3-2 by screws. The second connecting plate 6-3-2 is connected to the second lever 6-3-3 by a pin. The electric actuator 6-3, which is internally mounted on the upper part of the four-hole housing 6-8, is equipped with a second lever shaft 6-3-4. The second lever shaft 6-3-4 is connected to the second lever fork 6-3-5 by a flat key and screws. The second lever fork 6-3-5 is engaged in the groove of the second engagement sleeve 6-3-6.

[0029] During operation, when the front axle of the harvesting machine needs to be driven by two-wheel drive, the second electric push rod 6-3-1 in the electric device 6-3 of the L-shaped electric four-hole box 6 is extended or retracted by the button operation. The second electric push rod 6-3-1 drives the second connecting plate 6-3-2 in the electric device 6-3, the second connecting plate 6-3-2 drives the second paddle 6-3-3, the second paddle 6-3-3 drives the second paddle shaft 6-3-4, the second paddle shaft 6-3-4 drives the second paddle fork 6-3-5 to rotate, and the second paddle fork 6-3-5 drives the second meshing sleeve 6-3-6 to move along the axis of the bevel gear and spur gear shaft assembly 6-4, so as to realize the engagement or disengagement of the power of the L-shaped electric four-hole box 6. Similarly, in the electrically controlled four-hole box 2, the first electric push rod 2-4-1 in the electric control device 2-4 extends or retracts, the first electric push rod 2-4-1 drives the first connecting plate 2-4-2 to swing, the first connecting plate 2-4-2 drives the first paddle 2-4-3 to swing through the pin shaft, the first paddle 2-4-3 drives the first paddle shaft 2-4-4 to swing, the first paddle shaft 2-4-4 drives the first paddle fork 2-4-5 to swing, and the first paddle fork 2-4-5 drives the first meshing sleeve 2-4-6 to move along the shaft of the first spur gear shaft assembly 2-2, thereby realizing the engagement or disengagement of the power of the electrically controlled four-hole box 2.

[0030] When the L-shaped electronically controlled four-hole box 6 and the electronically controlled four-hole vertical box 2 are disengaged, the power is transmitted from the hydraulic motor 8 to the front box 7, so that the driving power is transmitted to the front axle, while the rear axle 1 is not driven, thus realizing two-wheel drive. When four-wheel drive is required with both the front and rear axles 1, the L-shaped electronically controlled four-hole housing 6 and the electronically controlled four-hole vertical housing 2 are connected via button operation. At this time, power is transmitted from the hydraulic motor 8 to the front housing 7, which transmits the driving power to the front axle. Simultaneously, the power of the front housing 7 is transmitted from the drive shaft inside the front housing 7 to the shaft of the seventh spur gear shaft assembly 6-7 inside the connecting plate 6-9 on the L-shaped electronically controlled four-hole housing 6. Then, the power is transmitted sequentially from the four-hole housing flange 6-1 on the L-shaped electronically controlled four-hole housing 6 to the second drive shaft 5, bearing housing 4, first drive shaft 3, and electronically controlled four-hole vertical housing 2. The shaft of the first spur gear shaft assembly 2-2 inside the connecting seat 2-1 on the electronically controlled four-hole vertical housing 2 is transmitted to the drive shaft inside the connecting seat on the central assembly 1-7 on the rear axle 1. At this time, the rear axle 1 is driven, thus realizing four-wheel drive.

[0031] In practical applications, this utility model is not limited to the situation described in this example. All technical solutions and improvements that do not depart from the substantive content of this utility model should fall within the scope of the claims of this utility model.

Claims

1. A harvesting machinery transmission structure integrating the drive axle and transmission box, comprising: The rear axle (1), the electrically controlled four-hole box (2), the first drive shaft (3), the bearing seat (4), the second drive shaft (5), the L-shaped electrically controlled four-hole box (6), the front box (7), and the hydraulic motor (8) are characterized in that: the rear axle (1) is connected to the electrically controlled four-hole box (2) by bolts, the electrically controlled four-hole box (2) is connected to the first drive shaft (3) by flange bolts, the first drive shaft (3) is connected to the bearing seat (4) by flange bolts, the bearing seat (4) is connected to the second drive shaft (5) by flange bolts, the second drive shaft (5) is connected to the L-shaped electrically controlled four-hole box (6) by flange bolts, the L-shaped electrically controlled four-hole box (6) is connected to the front box (7) by connecting plate bolts, and the front box (7) is connected to the hydraulic motor (8) by motor support bolts.

2. The harvesting machinery transmission structure integrating the drive axle and transmission box as described in claim 1, characterized in that: The rear axle (1) includes: a left wheel side assembly (1-1), a long drive shaft assembly (1-2), a cylinder assembly (1-3), a tie rod assembly (1-4), a long half-shaft housing (1-5), a central housing (1-6), a central assembly (1-7), a short drive shaft assembly (1-8), a short half-shaft housing (1-9), a right wheel side assembly (1-10), a left steering knuckle (1-1-1), and a right steering knuckle (1-10-1); the left wheel side assembly (1-1) and the right wheel side assembly (1-10) are located at the left and right ends of the rear axle (1), respectively; the long drive shaft assembly (1-2) is connected to the left wheel side assembly (1-1); the cylinder assembly... (1-3) One end is connected to the left steering knuckle (1-1-1) of the left wheel assembly (1-1), and the other end of the cylinder assembly (1-3) is connected to the long half-shaft housing (1-5); one end of the central housing (1-6) is connected to the long half-shaft housing (1-5), and the other end of the central housing (1-6) is connected to the short half-shaft housing (1-9); the central assembly (1-7) is connected to the central housing (1-6); the short drive shaft assembly (1-8) is connected to the right wheel assembly (1-10); one end of the tie rod assembly (1-4) is connected to the left steering knuckle (1-1-1), and the other end of the tie rod assembly (1-4) is connected to the right steering knuckle (1-10-1).

3. The harvesting machinery transmission structure integrating the drive axle and transmission box as described in claim 1, characterized in that: The electrically controlled four-hole vertical box (2) includes: a connecting seat (2-1), a first spur gear shaft assembly (2-2), a second spur gear shaft assembly (2-3), an electrical control device (2-4), a third spur gear shaft assembly (2-5), a box flange (2-6), a fourth spur gear shaft assembly (2-7), and a box housing (2-8); the connecting seat (2-1) is fixedly installed on the box housing (2-8) by bolts; the first spur gear shaft assembly (2-2), the second spur gear shaft assembly (2-3), the third spur gear shaft assembly (2-5), and the fourth spur gear shaft assembly (2-7) are installed sequentially inside the box housing (2-8); part of the electrical control device (2-4) is internally mounted on the shaft of the first spur gear shaft assembly (2-2), and the other part is externally mounted on the box housing (2-8); the box flange (2-6) is connected to the shaft of the fourth spur gear shaft assembly (2-7) by an internal spline.

4. The harvesting machinery transmission structure integrating the drive axle and transmission box as described in claim 1, characterized in that: The L-shaped electrically controlled four-hole box (6) includes: a four-hole box flange (6-1), a bevel gear shaft assembly (6-2), an electric actuator (6-3), a bevel and spur gear shaft assembly (6-4), a fifth spur gear shaft assembly (6-5), a sixth spur gear shaft assembly (6-6), a seventh spur gear shaft assembly (6-7), a four-hole box housing (6-8), and a connecting plate (6-9); at one end of the four-hole box housing (6-8), the four-hole box flange (6-1) is connected to the bevel gear shaft assembly (6-2) via a spline. The shafts are connected; inside the four-hole housing (6-8), the bevel gear shaft assembly (6-2), the bevel and spur gear shaft assembly (6-4), the fifth spur gear shaft assembly (6-5), the sixth spur gear shaft assembly (6-6), and the seventh spur gear shaft assembly (6-7) are installed in sequence; part of the electric device (6-3) is installed on the shaft of the bevel and spur gear shaft assembly (6-4), and the other part is installed on the four-hole housing (6-8); a connecting plate (6-9) is installed at the other end of the four-hole housing (6-8).

5. The harvesting machinery transmission structure integrating the drive axle and transmission box as described in claim 4, characterized in that: The connecting plate (6-9) on the L-shaped electric control four-hole box (6) is connected to the front box (7) by connecting plate bolts, and the front box (7) is connected to the hydraulic motor (8) by motor support bolts.

Images