Hydrostatic transmission structure adopting rear motor

Abstract

The utility model provides a hydrostatic transmission structure adopting a rear motor, which comprises a travel motor and a transfer case, the travel motor is positioned on the right side of the transfer case, an input shaft is arranged at the right upper corner of the transfer case, the travel motor is directly connected with the input shaft of the transfer case, the travel motor is changed from a front-mounted type to a rear-mounted type, and the rear-mounted type of the travel motor is changed from the front-mounted type to the rear-mounted type. The arrangement space of the walking pump, the working pump and other related pump structures is reserved, and therefore the problem that the arrangement of the pump and the walking motor in the backhoe loader is limited is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of transmission methods for excavators and loaders, and in particular to a hydrostatic transmission structure using a rear-mounted motor. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Currently, all backhoe loaders use hydraulic transmission. This hydraulic transmission method has low transmission efficiency, high fuel consumption, high noise, and poor operating comfort. For this reason, the applicant believes that the above-mentioned hydraulic transmission can be replaced with hydrostatic transmission. Traditional transfer cases all use front-mounted motors. However, due to the small internal space of backhoe loaders, the arrangement of pumps and motors inside the backhoe loader will be greatly restricted when using a front-mounted motor hydrostatic transmission scheme. Utility Model Content

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, this utility model provides a hydrostatic transmission structure with a rear-mounted motor. This transmission scheme changes the front-mounted motor of the transfer case to a rear-mounted one, making room for the pump and thus solving the problem of limited arrangement of pumps and motors inside the excavator loader.

[0005] A hydrostatic transmission structure with a rear-mounted motor includes a travel motor and a transfer case. The travel motor is located on the right side of the transfer case, and an input shaft is provided at the upper right corner of the transfer case. The travel motor is directly connected to the input shaft of the transfer case.

[0006] Furthermore, the transfer case is provided with an output shaft, which is located at the lower left of the transfer case and is diagonally opposite to the input shaft.

[0007] Furthermore, it also includes a drive unit, which includes a front drive axle, a rear drive axle and a drive shaft. One end of the drive shaft is connected to the output shaft of the transfer case and the other end is connected to the front drive axle. The rear drive axle is located below the drive motor and is integrated with the transfer case.

[0008] Furthermore, it also includes an engine, which is located above the drive shaft.

[0009] Furthermore, a travel pump is also provided on the right side of the engine. One end of the travel pump is connected to the engine, and the other end is connected to the travel motor through a connecting pipe.

[0010] Furthermore, a working pump is also provided on the right side of the traveling pump. The working pump is located between the traveling pump and the transfer case, and is connected in series with the traveling pump.

[0011] Furthermore, the working pump has an oil suction pipe connected to its front side and an oil discharge pipe connected to its upper side.

[0012] Furthermore, the end of the working pump away from the transfer case is connected to the travel pump, while the other end is connected to an oil replenishment device.

[0013] Furthermore, the oil replenishment device includes an oil replenishment pump, an oil replenishment filter, an oil replenishment pump outlet pipe, and an oil replenishment pump inlet pipe. The oil replenishment pump is located on the right side of the working pump and is fixed on the end of the working pump away from the traveling pump. The oil replenishment pump and the working pump are not connected. The front side of the oil replenishment pump is connected to the oil replenishment pipe, and the rear side of the oil replenishment pump is connected to the oil replenishment pump outlet pipe. The other end of the oil replenishment pump outlet pipe is directly connected to the traveling pump.

[0014] Furthermore, the replenishing oil filter is installed on the oil outlet pipe of the replenishing oil pump.

[0015] The present invention has the following beneficial effects from one or more of the above technical solutions:

[0016] 1. This utility model changes the hydrostatic transmission travel motor from a front-mounted type to a rear-mounted type, freeing up the layout space for the travel pump and working pump and other related pump structures, thereby solving the problem of restricted arrangement of pumps and motors inside the excavator loader.

[0017] 2. This utility model adopts a hydrostatic transmission method, which does not use a gearbox or other structures in its structure. The mechanical energy of the engine can be converted into hydraulic energy through the travel pump, and the hydraulic energy can be converted into mechanical energy through the travel motor. Finally, the mechanical energy is transmitted to the travel drive device through the transfer case, which can improve the transmission efficiency of the excavator loader and further improve the work efficiency of travel, excavation and loading.

[0018] Advantages of the present invention in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0020] Figure 1 This is a schematic diagram showing the positions of the rear-mounted travel motor and transfer case of this utility model;

[0021] Figure 2 This is a side view of the hydrostatic transmission structure of this utility model;

[0022] Figure 3This is a top view of the hydrostatic transmission structure of this utility model;

[0023] In the diagram: 1. Travel motor, 2. Transfer case, 3. Input shaft, 4. Travel pump, 5. Engine, 6. Front drive axle, 7. Rear drive axle, 8. Drive shaft, 9. Working pump, 10. Working pump outlet pipe, 11. Working pump suction pipe, 12. Make-up pump, 13. Make-up filter, 14. Make-up pump outlet pipe, 15. Make-up pump inlet pipe, 16. Output shaft. Detailed Implementation

[0024] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, 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.

[0025] It should be noted that the terminology used herein is for the purpose of describing specific implementations only and is not intended to limit the exemplary implementations of this utility model. Unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0026] like Figures 1 to 3 As shown, this embodiment provides a hydrostatic transmission structure with a rear-mounted motor, including a travel motor 1 and a transfer case 2. The travel motor 1 is located on the right side of the transfer case 2, and an input shaft 3 is provided at the upper right corner of the transfer case. The travel motor 1 is directly connected to the input shaft 3 of the transfer case.

[0027] Specifically, the travel motor 1 and the input shaft 3 of the transfer case are connected by a coupling. The travel motor in this embodiment is existing technology and is equipped with a high-pressure automatic variable displacement device. When the high-speed gear is engaged, oil is supplied to the manual shift port, pushing the shift valve to the left, making the motor a small displacement motor. If the travel resistance increases, causing the oil pressure to rise to the set value, the oil pushes the shift valve to the right, and the motor automatically switches to a large displacement low speed gear to increase torque. The travel motor can convert hydraulic energy into mechanical energy to move the equipment. It can provide sufficient driving force and torque to meet the travel needs under different terrain and load conditions.

[0028] Since the input end of the travel motor receives oil, the left side of the transfer case is also equipped with a travel pump 4 and an engine 5. The engine 5 has an output end at the rear, which can transmit power outward. The travel pump 4 is located on the right side of the engine 5. One side of the travel pump 4 is connected to the output end 6 of the engine, and the other side is connected to the travel motor 1 through a connecting pipe.

[0029] In this embodiment, the engine is the power source for the excavator loader tracks and the loaded cargo. The engine has an oil inlet, which is connected to a fuel tank containing fuel via a pipe. When the engine is running, it converts the chemical energy in the fuel into the mechanical energy of the piston movement and transmits the power outward through the output end. Since the travel pump is connected to the output end of the engine, the mechanical power generated by the piston movement of the engine is transmitted to the travel pump. After receiving the mechanical power from the engine, the travel pump converts the mechanical energy of the engine into hydraulic energy through its internal hydraulic system and generates high-pressure oil. Then, the hydraulic oil in the travel pump flows to the travel motor through the connecting pipe. The travel motor converts the hydraulic energy in the high-pressure oil into mechanical energy and transmits the mechanical energy to each transfer case through the coupling. The transfer case can reasonably distribute the mechanical power at the travel motor and deliver the power to the drive device.

[0030] The transfer case is equipped with an output shaft 16, which is located at the lower left of the transfer case and is diagonally opposite to the input shaft. The output shaft has the same function as the output end of the engine, which is to transmit mechanical power.

[0031] To better transmit mechanical power to the front and rear wheels of the excavator loader, this embodiment also includes a drive unit at the transfer case 2. The drive unit is an intermediate transmission medium through which the transfer case transmits mechanical power to the front and rear wheels according to actual needs. The drive unit includes a front drive axle 6, a rear drive axle 7, and a drive shaft 8. One end of the drive shaft 8 is connected to the output shaft of the transfer case, and the other end is connected to the front drive axle 6. The rear drive axle 7 is located below the transmission motor and adopts an integrated structure with the transfer case. In this embodiment, the front drive axle and the transfer case adopt a front-rear separate structure, connected in the middle by a drive shaft.

[0032] In this embodiment, both the front drive axle 6 and the rear drive axle 7 are directly connected to the transmission wheels. The transfer case 2 can reasonably distribute the power output by the travel motor to the two wheels on the front axle and the two wheels on the rear axle, so that the vehicle can generate driving force and move by driving the tracks to rotate.

[0033] The engine 5, travel pump 4, transfer case 2, travel motor 1 and drive device in this embodiment are all existing technologies, and their specific internal structures will not be described in detail in this article.

[0034] In addition, in order to realize the digging and loading tasks of the excavator loader, a working pump 9 is also provided on the right side of the engine. The working pump 9 is located between the travel pump 4 and the transfer case 2. The working pump 9 and the travel pump 4 are connected in series and parallel. The end of the working pump away from the transfer case is connected to the travel pump, and the other end is connected to the oil replenishment device. The working pump oil outlet pipe 10 is connected to the upper side of the working pump. In this embodiment, the other side of the working pump oil outlet pipe is connected to the working device of the excavator loader.

[0035] Since the oil in the working pump will be damaged during the working cycle, this embodiment has a working pump suction pipe 11 connected to the front side of the working pump. Specifically, the end of the working pump suction pipe 11 away from the working pump is connected to the oil tank. The oil in the oil tank can be drawn through the suction pipe and added to the working pump to replenish the lost oil.

[0036] The oil replenishment device includes an oil replenishment pump 12, an oil replenishment filter 13, an oil replenishment pump outlet pipe 14, and an oil replenishment pump inlet pipe 15. The oil replenishment pump 12 is located on the right side of the working pump and is fixed on the end of the working pump away from the traveling pump. The oil replenishment pump and the working pump are not connected. The front side of the oil replenishment pump is connected to the oil replenishment pump suction pipe 15, which is connected to the oil tank in this embodiment. The rear side of the oil replenishment pump is connected to the oil replenishment pump outlet pipe 14, and the other end of the oil replenishment pump outlet pipe 14 is directly connected to the traveling pump. The oil replenishment filter 13 is installed on the oil replenishment pump outlet pipe and can be used to filter the oil.

[0037] The make-up pump and make-up filter in this embodiment are both existing technologies. The make-up pump can absorb oil from inside the fuel tank through the make-up pump suction pipe, and then add the oil to the travel pump through the make-up pump outlet pipe to compensate for the loss caused by oil circulation. In addition, this embodiment can also provide cooling oil to the system to reduce the system temperature, maintain the pressure of the main system circuit, provide operating pressure to the control circuit, and replenish the oil loss caused by internal leakage. The make-up pump plays an indispensable role in the precise control inside the vehicle, ensuring the stability and safety of vehicle performance.

[0038] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A hydrostatic transmission structure employing a rear-mounted motor, characterized in that, It includes a travel motor and a transfer case. The travel motor is located on the right side of the transfer case, and an input shaft is provided at the upper right corner of the transfer case. The travel motor is directly connected to the input shaft of the transfer case.

2. The hydrostatic transmission structure using a rear-mounted motor as described in claim 1, characterized in that, The transfer case is equipped with an output shaft, which is located at the lower left of the transfer case and is diagonally opposite to the input shaft.

3. The hydrostatic transmission structure using a rear-mounted motor as described in claim 1, characterized in that, It also includes a drive unit, which includes a front drive axle, a rear drive axle and a drive shaft. One end of the drive shaft is connected to the output shaft of the transfer case and the other end is connected to the front drive axle. The rear drive axle is located below the drive motor and is integrated with the transfer case.

4. The hydrostatic transmission structure using a rear-mounted motor as described in claim 1, characterized in that, It also includes an engine, which is located above the drive shaft.

5. The hydrostatic transmission structure using a rear-mounted motor as described in claim 4, characterized in that, A travel pump is also installed on the right side of the engine. One end of the travel pump is connected to the engine, and the other end is connected to the travel motor through a connecting pipe.

6. The hydrostatic transmission structure employing a rear-mounted motor as described in claim 5, characterized in that, A working pump is also provided on the right side of the traveling pump. The working pump is located between the traveling pump and the transfer case and is connected in series with the traveling pump.

7. The hydrostatic transmission structure employing a rear-mounted motor as described in claim 6, characterized in that, The working pump has an oil suction pipe connected to its front side and an oil discharge pipe connected to its upper side.

8. The hydrostatic transmission structure employing a rear-mounted motor as described in claim 6, characterized in that, The working pump is connected to the travel pump at one end away from the transfer case, and the other end is connected to the oil replenishment device.

9. A hydrostatic transmission structure employing a rear-mounted motor as described in claim 8, characterized in that, The oil replenishment device includes an oil replenishment pump, an oil replenishment filter, an oil replenishment pump outlet pipe, and an oil replenishment pump inlet pipe. The oil replenishment pump is located on the right side of the working pump and is fixed on the end of the working pump away from the traveling pump. The oil replenishment pump and the working pump are not connected. The front side of the oil replenishment pump is connected to the oil replenishment pipe, and the rear side of the oil replenishment pump is connected to the oil replenishment pump outlet pipe. The other end of the oil replenishment pump outlet pipe is directly connected to the traveling pump.

10. A hydrostatic transmission structure employing a rear-mounted motor as described in claim 9, characterized in that, The replenishment filter is installed on the oil outlet pipe of the replenishment pump.

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