Hydrostatic loader travel system

Abstract

The utility model provides a kind of static hydraulic loader walking system, belong to static hydraulic loader technical field, including walking pump, walking motor and solenoid valve, the walking pump is connected with engine transmission, closed circuit is formed through oil pipe between walking pump and walking motor, the solenoid valve is normally closed solenoid valve, the solenoid valve is set on the oil pipe between walking pump and walking motor.The utility model can be realized in loader whole vehicle fault to it is trailer, will not cause walking system hardware damage.

Description

Technical Field

[0001] This utility model belongs to the field of hydrostatic loader technology, and in particular relates to a hydrostatic loader walking system. Background Technology

[0002] Traditional hydrostatic loaders mostly use closed circuits, which means that the vehicle cannot be towed directly when it breaks down. If it is forcibly towed, the travel motor will function as a pump, and the travel pump will function as a travel motor. In this case, the hydraulic oil in the travel system will flow in reverse, which can easily cause damage to the travel system hardware. Utility Model Content

[0003] In view of the defects or deficiencies in the existing technology, this utility model provides a hydrostatic loader walking system that can tow the loader in the event of a complete vehicle failure without causing damage to the walking system hardware.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An embodiment of this utility model provides a hydrostatic loader travel system, including a travel pump, a travel motor, and a solenoid valve. The travel pump is connected to the engine drive, and a closed circuit is formed between the travel pump and the travel motor through an oil pipe. The solenoid valve is a normally closed solenoid valve, and the solenoid valve is installed on the oil pipe between the travel pump and the travel motor.

[0005] Furthermore, the output end of the engine is equipped with a coupling, and is connected to the travel pump via the coupling.

[0006] Furthermore, the traveling pump is a bidirectional variable pump.

[0007] Furthermore, the walking motor is a bidirectional variable displacement motor.

[0008] Furthermore, the travel pump is provided with an S oil port and a P oil port, and the travel motor is provided with an A oil port and a B oil port. The S oil port on the travel pump is connected to the B oil port on the travel motor through an oil pipe, and the P oil port on the travel pump is connected to the A oil port on the travel motor through an oil pipe.

[0009] Furthermore, the output end of the walking motor is connected to the gearbox, and is connected to the drive axle via the gearbox.

[0010] Furthermore, the traveling pump is also equipped with an oil replenishment port, which is connected to the output end of the replenishment pump via an oil pipe, and the input end of the replenishment pump is connected to the hydraulic oil tank via an oil pipe.

[0011] Furthermore, the fuel pump is connected to the engine drive.

[0012] Furthermore, the traveling pump is also equipped with an oil return port, which is connected to the hydraulic oil tank via an oil pipe.

[0013] Furthermore, the solenoid valve is a normally closed two-position four-way valve.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention features a normally closed solenoid valve installed between the travel pump and the travel motor. When the loader is operating normally, the solenoid valve is energized and in the conducting position, connecting the pipeline between the travel pump and the travel motor. The travel pump drives the travel motor to rotate, thereby moving the loader. When the loader malfunctions, the power is disconnected, the solenoid valve is de-energized and in the cut-off position, disconnecting the pipeline between the travel pump and the travel motor, thus breaking the transmission connection between them. In this case, towing the loader will not damage the hardware of the travel system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the walking system structure in an embodiment of the present invention; Among them, 1. Engine; 2. Travel pump; 3. Travel motor; 4. Solenoid valve. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] A typical embodiment of this utility model is as follows: Figure 1 As shown, a hydrostatic loader travel system includes an engine 1, a travel pump 2, a travel motor 3, and a solenoid valve 4. The output end of the engine 1 is connected to the input end of the travel pump 2. The hydraulic oil inlet and outlet of the travel pump 2 are connected to the hydraulic oil inlet and outlet of the travel motor 3 through oil pipes, so that a closed loop is formed between the travel pump 2 and the travel motor 3. The solenoid valve 4 is connected to the oil pipe between the travel pump 2 and the travel motor 3. The solenoid valve 4 can disconnect the oil circuit between the travel pump 2 and the travel motor 3 when the power is off, so as to facilitate towing when the loader fails.

[0018] Specifically, the output end of engine 1 is equipped with a coupling, which is connected to the travel pump 2 via the coupling. In this embodiment, the travel pump 2 is a bidirectional variable pump, and the travel motor 3 is a bidirectional variable motor. The travel pump 2 is equipped with two hydraulic ports, namely port S and port P, and the travel motor 3 is equipped with two hydraulic ports, namely port A and port B. The port S on the travel pump 2 is connected to the port B on the travel motor 3 via an oil pipe, and the port P on the travel pump 2 is connected to the port A on the travel motor 3 via an oil pipe, so that a closed loop is formed between the travel pump 2 and the travel motor 3. The travel pump 2 drives the travel motor 3 to rotate hydraulically. The output end of the travel motor 3 is connected to the gearbox, and is connected to the drive axle via the gearbox, thereby driving the loader to move.

[0019] Furthermore, the travel pump 2 is also equipped with an oil replenishment port (F port). The oil replenishment port of the travel pump 2 is connected to the output end of the oil replenishment pump through an oil pipe. The oil replenishment pump is connected to the engine 1 for transmission. The engine 1 drives the oil replenishment pump to rotate. The input end of the oil replenishment pump is connected to the hydraulic oil tank through an oil pipe. The oil replenishment pump replenishes oil to the travel pump 2. At the same time, the travel pump 2 is also equipped with an oil return port (L port). The oil return port is connected to the hydraulic oil tank through an oil pipe for oil return to maintain the closed-loop requirements.

[0020] Solenoid valve 4 is installed on the oil pipe between travel pump 2 and travel motor 3. Solenoid valve 4 is a normally closed two-position four-way valve. During normal operation, solenoid valve 4 is kept energized. At this time, solenoid valve 4 is in the left position under the action of the coil. The left position is the conducting position. The S port of travel pump 2 is connected to the B port of travel motor 3, and the P port of travel pump 2 is connected to the A port of travel motor 3. At this time, the loader can move normally.

[0021] When the loader malfunctions and cannot drive normally, the power is turned off, solenoid valve 4 is de-energized, and under the action of the right return spring, solenoid valve 4 is in the right position, which is the cut-off position. At this time, the P port of the travel pump 2 is connected to the S port of the travel motor 3 through the solenoid valve 4, and the pipeline between the travel pump 2 and the travel motor 3 is completely disconnected, cutting off the power transmission between the travel pump 2 and the travel motor 3, which can realize arbitrary towing.

[0022] When the vehicle loses power due to an abnormal situation, the solenoid valve 4 is also in the right position. At this time, the transmission between the travel pump 2 and the travel motor 3 is disconnected, and towing can be carried out.

[0023] Traditional hydrostatic loaders mostly use closed circuits, which means they cannot be towed when the vehicle breaks down. If the vehicle is forcibly towed, the travel motor will function as a pump, and the travel pump will function as a travel motor. This will cause the hydraulic oil in the travel system to flow in reverse, which can easily damage the hardware of the travel system.

[0024] This invention features a normally closed solenoid valve installed between the travel pump and the travel motor. When the loader is operating normally, the solenoid valve is energized and in the conducting position, connecting the pipeline between the travel pump and the travel motor. The travel pump drives the travel motor to rotate, thereby moving the loader. When the loader malfunctions, the power is disconnected, the solenoid valve is de-energized and in the cut-off position, disconnecting the pipeline between the travel pump and the travel motor, thus breaking the transmission connection between them. In this case, towing the loader will not damage the hardware of the travel system.

[0025] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A hydrostatic loader walking system, characterized in that, It includes a travel pump, a travel motor, and a solenoid valve. The travel pump is connected to the engine drive, and the travel pump and the travel motor form a closed circuit through an oil pipe. The solenoid valve is a normally closed solenoid valve and is installed on the oil pipe between the travel pump and the travel motor.

2. The hydrostatic loader walking system as described in claim 1, characterized in that, The engine output end is equipped with a coupling, which is connected to the traveling pump via the coupling.

3. The hydrostatic loader walking system as described in claim 1, characterized in that, The traveling pump is a bidirectional variable pump.

4. The hydrostatic loader walking system as described in claim 1, characterized in that, The walking motor is a bidirectional variable displacement motor.

5. The hydrostatic loader walking system as described in claim 1, characterized in that, The travel pump is equipped with an S oil port and a P oil port, and the travel motor is equipped with an A oil port and a B oil port. The S oil port on the travel pump is connected to the B oil port on the travel motor through an oil pipe, and the P oil port on the travel pump is connected to the A oil port on the travel motor through an oil pipe.

6. The hydrostatic loader walking system as described in claim 1, characterized in that, The output end of the walking motor is connected to the gearbox, and the gearbox is connected to the drive axle for transmission.

7. The hydrostatic loader walking system as described in claim 1, characterized in that, The traveling pump is also equipped with an oil replenishment port, which is connected to the output end of the replenishment pump via an oil pipe. The input end of the replenishment pump is connected to the hydraulic oil tank via an oil pipe.

8. The hydrostatic loader walking system as described in claim 7, characterized in that, The fuel pump is connected to the engine drive.

9. The hydrostatic loader walking system as described in claim 1, characterized in that, The traveling pump is also equipped with an oil return port, which is connected to the hydraulic oil tank via an oil pipe.

10. The hydrostatic loader walking system as described in claim 1, characterized in that, The solenoid valve is a normally closed two-position four-way valve.

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