Built-in motor type tractor drive axle

Abstract

The invention discloses a built-in motor type tractor drive axle which comprises an integrated shell, a drive motor is arranged in the integrated shell, and a main drive shaft is connected into the drive motor in an embedded mode. A first gear and a driving bevel gear are fixedly installed on the main driving shaft, a differential bridge is arranged in the integrated shell, the driving bevel gear is in power connection with the differential bridge, and the two output ends of the differential bridge penetrate through the outer wall of the integrated shell to be arranged on the two sides of the integrated shell in an overhanging mode. A front driving assembly and a rear driving assembly are arranged in an integrated shell, a first gear drives the front driving assembly and the rear driving assembly to rotate, and power output is achieved; a hanging assembly is arranged on the outer side of the integrated shell and used for hanging an operation component; and the motor controller is embedded in the electric drive axle. The drive axle is high in integration level, the motor is arranged in the integrated shell, the drive axle can adapt to the severe working environment, a complex variable transmission structure is omitted, control is easy and convenient, and the drive axle can be applied to different tractors and is good in universality.

Description

Technical Field

[0001] The invention relates to the technical field of electric tractors, and in particular to a built-in motor type tractor drive axle. Background Art

[0002] The tractor gearbox is one of the key components of the tractor. It forms a transmission system with the rear axle, power output shaft transmission, four-wheel drive (except the front axle), brakes and other components. Its function is to convert the high-speed and low-torque output of the diesel engine into the low-speed and high-torque output of the drive axle and the power output shaft. The transmission system of existing products with the gearbox as the core accounts for about 25% to 30% of the total cost of the tractor, which is much higher than the cost of the engine. With the rapid development of electric vehicles, electric tractors also have a broad application prospect. However, the current electric tractors inherit the rear drive axle and transmission assembly of traditional internal combustion engine tractors, and slightly modify the interface connected to the engine as the motor interface for walking and operation drive. This leads to a mismatch between the transmission system and the power output of the motor, and the motor's infinitely variable speed regulation characteristics cannot be brought into play. The power output of the motor still needs to be transmitted through a transmission box with integrated high and low gears (or more gears), and a joystick for switching the transmission ratio is arranged outside the transmission box accordingly, resulting in a complicated transmission structure and operation. And it makes the structure of the tractor complex and increases the overall size. Summary of the invention

[0003] The purpose of the present invention is to provide a tractor drive axle with a built-in motor, which has a high degree of integration and the motor is built into an integrated housing, can adapt to harsh working environments, eliminates complex speed transmission structures, is simple and convenient to control, can be applied to different tractors, and has good versatility.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A built-in motor tractor drive axle comprises an integrated housing, a drive motor is arranged in the integrated housing, a main drive shaft is embedded and connected in the drive motor; a first gear and a drive bevel gear are fixedly mounted on the main drive shaft, a differential bridge is arranged in the integrated housing, the drive bevel gear is power-connected to the differential bridge, two output ends of the differential bridge pass through the outer wall of the integrated housing and are cantilevered on both sides of the integrated housing; a front drive assembly and a rear drive assembly are arranged in the integrated housing, the first gear drives the front drive assembly and the rear drive assembly to rotate and realize power output; a suspension assembly is arranged on the outer side of the integrated housing, and the suspension assembly is used to hang working parts.

[0006] Preferably, an outer protrusion is provided on one side of the integrated housing, and the drive motor is fixedly disposed in the outer protrusion.

[0007] Preferably, one end of the main driving shaft passes through the driving motor and is rotatably mounted on the integrated housing.

[0008] Preferably, the front drive assembly includes a first intermediate shaft and a front output drive shaft rotatably mounted in the integrated housing, a second gear and a third gear fixedly mounted on the first intermediate shaft, and a fourth gear fixedly mounted on the front output drive shaft, the fourth gear meshing with the third gear, and the second gear meshing with the first gear; one end of the front output drive shaft extends to the outside of the integrated housing.

[0009] Preferably, the rear drive assembly includes a second intermediate shaft and a rear output drive shaft rotatably mounted in the integrated housing, a fifth gear and a sixth gear fixedly mounted on the second intermediate shaft, and a seventh gear fixedly mounted on the rear output drive shaft, the sixth gear meshing with the seventh gear, and the fifth gear meshing with the first gear; one end of the rear output drive shaft extends to the outside of the integrated housing.

[0010] Preferably, the suspension assembly includes a parallelogram component rotatably mounted on the integrated shell, a lifting drive component mounted between the parallelogram component and the integrated shell, and a suspension arm hingedly mounted on the integrated shell, and two hanging parts are provided at the bottom of the parallelogram component extending backward, and the two hanging parts and the suspension arm form a three-point suspension.

[0011] Preferably, a motor controller is arranged on the top of the outer protrusion, and the motor controller is electrically connected to the driving motor.

[0012] Preferably, the lifting drive component is an electric push rod or a hydraulic cylinder.

[0013] In the present invention, the integrated housing is provided to centrally house the driving motor, the speed reducer and the differential bridge, so that the overall structure is simple and compact, and can output both front and rear power at the same time, which can not only provide power for the rear working parts, but also drive the front wheels of the tractor to achieve four-wheel drive, improve the driving ability of the tractor, cancel the complex speed transmission structure, and make the control simple and convenient. And the main components are all built in the integrated housing, so that the tractor can adapt to the harsh working environment and avoid collision damage. The highly integrated structural design is adopted, and the overall size is greatly reduced, which is convenient for layout on the tractor, and the possibility of applying the drive bridge on tractors of different brands is increased. The suspension assembly is provided as a whole to hang the working parts in a three-point suspension manner, which can adjust the height of the working parts and has a strong adjustment ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 It is a schematic cross-sectional view of the structure of the present invention;

[0016] In the figure: 1. integrated housing; 2. drive motor; 3. main drive shaft; 4. protrusion; 5. motor controller; 6. front drive assembly; 7. rear drive assembly; 8. suspension assembly; 9. differential bridge; 10. first gear; 11. drive bevel gear; 60. first intermediate shaft; 61. front output drive shaft; 62. second gear; 63. third gear; 64. fourth gear; 70. second intermediate shaft; 71. rear output drive shaft; 72. fifth gear; 73. sixth gear; 74. seventh gear; 80. parallelogram member; 81. lifting drive member; 82. suspension arm; 83. hanging part. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings:

[0018] like Figure 1 and Figure 2 A built-in motor tractor drive axle shown includes an integrated housing 1, the integrated housing 1 includes a housing body and an end cover arranged on one side, the housing body has an installation cavity, and the end cover is fixed to the housing body by a sealing gasket and a bolt to seal the installation cavity. A drive motor 2 is fixedly arranged in the integrated housing 1, and a main drive shaft 3 is embedded in the rotor connected to the drive motor 2. When the drive motor 2 is powered and rotates, the main drive shaft 3 is driven to rotate. In one embodiment, an outer protrusion 4 is integrally arranged on one side of the integrated housing 1, and the stator of the drive motor 2 is embedded and fixed in the outer protrusion 4. One end of the main drive shaft 3 passes through the drive motor 2 and is rotatably mounted on the integrated housing 1 through a bearing. A motor controller 5 is fixedly arranged on the top of the outer protrusion 4 by a fastener, and the motor controller 5 is electrically connected to the drive motor 2. The control line of the motor controller 5 is electrically connected to the control system of the tractor. The tractor operator controls the motor speed and steering by controlling the control system of the tractor.

[0019] A first gear 10 and a driving bevel gear 11 are fixedly mounted on the main drive shaft 3, a differential bridge 9 is arranged in the integrated housing 1, the driving bevel gear 11 is power-connected to the differential bridge 9, two output ends of the differential bridge 9 pass through the outer wall of the integrated housing 1 and are cantilevered on both sides of the integrated housing 1, and rear drive wheels are fixedly mounted on the two output ends of the differential bridge 9. The differential bridge 9 is an existing product, and the structure is not described in detail in this application.

[0020] A front drive assembly 6 and a rear drive assembly 7 are arranged in the integrated housing 1, and the first gear 10 drives the front drive assembly 6 and the rear drive assembly 7 to rotate to achieve power output.

[0021] The front drive assembly 6 includes a first intermediate shaft 60 and a front output drive shaft 61 rotatably mounted in the integrated housing 1 through a bearing, a second gear 62 and a third gear 63 fixedly mounted on the first intermediate shaft 60, and a fourth gear 64 fixedly mounted on the front output drive shaft 61, wherein the fourth gear 64 is meshed and connected with the third gear 63, and the second gear 62 is meshed and connected with the first gear 61; one end of the front output drive shaft 61 extends to the outside of the integrated housing 1 to realize power output, and the exposed output end of the front output drive shaft 61 is a spline shaft for easy transmission connection. When in use, the front output drive shaft 61 is connected to the front wheel power through a clutch to realize part-time four-wheel drive.

[0022] The rear drive assembly 7 includes a second intermediate shaft 70 and a rear output drive shaft 71 rotatably mounted in the integrated housing 1 through a bearing, a fifth gear 72 and a sixth gear 73 fixedly mounted on the second intermediate shaft 70, and a seventh gear 74 fixedly mounted on the rear output drive shaft 71, the sixth gear 73 is meshed and connected with the seventh gear 74, and the fifth gear 72 is meshed and connected with the first gear 10; one end of the rear output drive shaft 71 extends to the outside of the integrated housing 1 to achieve power output. The exposed output end of the rear output drive shaft 71 is a spline shaft for easy transmission connection.

[0023] A suspension assembly 8 is provided on the outside of the integrated housing 1, and the suspension assembly 8 is used to hang the working parts. The suspension assembly 8 includes a parallelogram member 80 rotatably mounted on the integrated housing 1, a lifting drive member 81 hingedly mounted between the parallelogram member 80 and the integrated housing 1, and a suspension arm 82 hingedly mounted on the integrated housing 1. The bottom of the parallelogram member 80 extends backward and is provided with two hanging parts 83, and the two hanging parts 83 and the suspension arm 82 form a three-point suspension. In one embodiment, the lifting drive member 81 is an electric push rod or a hydraulic cylinder, and an electric push rod is selected in this embodiment. The parallelogram member 80 includes an articulated support fixedly mounted on the top of the integrated housing 1, a support shaft rotatably mounted on the articulated support, an upper support arm fixedly mounted on both sides of the support shaft, a lower support arm rotatably mounted on the bottom of both sides of the integrated housing 1, and a connecting arm hingedly mounted between the upper support arm and the lower support arm. The two ends of the lifting drive member 81 are hingedly mounted on the side wall of the integrated housing 1 and the lower support arm respectively. The hanging part 83 is fixedly arranged on the lower support arm.

[0024] The above embodiments are only some illustrations of the concept and implementation of the present invention, and are not intended to limit the same. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A built-in motor type tractor drive axle, comprising an integrated housing, characterized in that: A driving motor is arranged in the integrated housing, and a main driving shaft is embedded and connected in the driving motor; a first gear and a driving bevel gear are fixedly installed on the main driving shaft, a differential bridge is arranged in the integrated housing, the driving bevel gear is power-connected to the differential bridge, and two output ends of the differential bridge pass through the outer wall of the integrated housing and are cantilevered on both sides of the integrated housing; a front driving assembly and a rear driving assembly are arranged in the integrated housing, and the first gear drives the front driving assembly and the rear driving assembly to rotate and realize power output; a suspension assembly is arranged on the outer side of the integrated housing, and the suspension assembly is used to hang working parts.

2. The internal motor type tractor drive axle according to claim 1, characterized in that: An outer protrusion is arranged on one side of the integrated housing, and the driving motor is fixedly arranged in the outer protrusion.

3. The internal motor type tractor drive axle according to claim 2, characterized in that: One end of the main driving shaft passes through the driving motor and is rotatably mounted on the integrated housing.

4. The internal motor type tractor drive axle according to any one of claims 1 to 3, characterized in that: The front drive assembly includes a first intermediate shaft and a front output drive shaft rotatably mounted in the integrated housing, a second gear and a third gear fixedly mounted on the first intermediate shaft, and a fourth gear fixedly mounted on the front output drive shaft, the fourth gear meshing with the third gear, and the second gear meshing with the first gear; one end of the front output drive shaft extends to the outside of the integrated housing.

5. The internal motor type tractor drive axle according to claim 4, characterized in that: The rear drive assembly comprises a second intermediate shaft and a rear output drive shaft rotatably mounted in the integrated housing, a fifth gear and a sixth gear fixedly mounted on the second intermediate shaft, and a seventh gear fixedly mounted on the rear output drive shaft, the sixth gear meshing with the seventh gear, and the fifth gear meshing with the first gear; One end of the rear output drive shaft extends to the outside of the integrated housing.

6. The internal motor type tractor drive axle according to claim 1 or 5, characterized in that: The suspension assembly includes a parallelogram component rotatably mounted on the integrated shell, a lifting drive component mounted between the parallelogram component and the integrated shell, and a suspension arm hingedly mounted on the integrated shell. Two hanging parts are extended backward from the bottom of the parallelogram component, and the two hanging parts and the suspension arm form a three-point suspension.

7. The internal motor type tractor drive axle according to claim 2 or 3, characterized in that: A motor controller is arranged on the top of the outer protrusion, and the motor controller is electrically connected to the driving motor.

8. The internal motor type tractor drive axle according to claim 6, characterized in that: The lifting drive component is an electric push rod or a hydraulic cylinder.

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