Power reversing hydraulic system

Abstract

The utility model discloses a power reversing hydraulic system which comprises a main oil way, an oil inlet pipeline and an oil return pipeline, and a reverse gear electromagnetic reversing valve, a forward electromagnetic reversing valve, a high-speed electromagnetic reversing valve and a PTO electromagnetic reversing valve which are controlled to start through hydraulic oil are connected in the main oil way. The main oil way is provided with a pressure oil port P, a medium-pressure oil port MP, a pressure oil port P1, an oil return port T1, a control oil port C and an oil drainage port L1, the control oil port C of the main oil way is connected with the chassis lubricating system through a branch pipeline A, the oil drainage port L1 of the main oil way is connected with the chassis lubricating system through a branch pipeline C, and an oil return pipeline is connected with the chassis lubricating system through a branch pipeline B. The power reversing hydraulic system integrates multiple functions of reversing, advancing, high speed, PTO and the like, is compact in structure, saves space, reduces system complexity and fault points, and can lubricate a chassis.

Description

Technical Field

[0001] This utility model relates to a power reversing hydraulic system, belonging to the field of tractor power reversing technology. Background Technology

[0002] Tractor power reversing refers to changing direction without interrupting power while driving, such as shifting from forward to reverse, or changing the direction of power output to agricultural implements.

[0003] Currently, most tractor power reversing systems use mechanical reversing, which requires multiple independent systems to control different functions. This results in a complex structure, which is not conducive to saving space, increases system complexity and potential failure points, and makes it inconvenient to lubricate the chassis.

[0004] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] This utility model addresses the shortcomings of the prior art by providing a power reversing hydraulic system that integrates multiple functions such as reverse, forward, high speed, and PTO. It has a compact structure, saves space, reduces system complexity and failure points, and can also lubricate the chassis.

[0006] To solve the above technical problems, the present invention adopts the following technical solution:

[0007] The power reversing hydraulic system includes a main oil circuit, an inlet oil line, and a return oil line. The main oil circuit is connected to a reverse gear solenoid directional valve, a forward solenoid directional valve, a high-speed solenoid directional valve, and a PTO solenoid directional valve, all of which are controlled by hydraulic oil. The main oil circuit has a pressure port P, a medium-pressure port MP, a pressure port P1, a return oil port T1, a control port C, and a drain port L1. The control port C of the main oil circuit is connected to the chassis lubrication system via a branch line A. The drain port L1 of the main oil circuit is connected to the chassis lubrication system via a branch line C. The return oil line is connected to the chassis lubrication system via a branch line B.

[0008] Furthermore, the reverse gear solenoid valve, the forward solenoid valve, the high-speed solenoid valve, and the PTO solenoid valve are arranged side by side.

[0009] Furthermore, one end of the oil inlet pipe is connected to the oil tank, and the other end is connected to the pressure port P of the main oil circuit.

[0010] Furthermore, a hydraulic pump A, an inlet filter, and an accumulator are sequentially installed on the oil inlet pipeline.

[0011] Furthermore, one end of the return oil line is connected to the oil tank, and the other end is connected to the pressure port P1 of the main oil line.

[0012] Furthermore, a hydraulic pump B, a hydraulic valve block, a check valve, and a return oil filter are sequentially installed on the return oil line.

[0013] Furthermore, a cooler is installed on branch pipe A.

[0014] Furthermore, a relief valve for pressure regulation is connected to the bypass of the main oil circuit.

[0015] Furthermore, the connection point between branch line B and the return line is located between the hydraulic valve block and the check valve, and a throttle valve is installed on branch line B.

[0016] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0017] This utility model integrates multiple functions such as reverse, forward, high speed, and PTO, and switches them through components such as electromagnetic directional valves. Compared with the traditional method of controlling different functions separately by multiple independent systems, it is more compact and saves space, and also reduces system complexity and failure points. The coordination between various hydraulic components has been optimized by design, which can better exert the overall efficiency.

[0018] By setting up multiple branch oil lines connected to the chassis lubrication system, the chassis lubrication function is achieved.

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] In the diagram, 1-Main oil circuit, 2-Reverse gear solenoid directional valve, 3-Forward solenoid directional valve, 4-High-speed solenoid directional valve, 5-PTO solenoid directional valve, 6-Inlet oil line, 7-Oil tank, 8-Return oil line, 9-Hydraulic pump A, 10-Inlet oil filter, 11-Accumulator, 12-Hydraulic pump B, 13-Hydraulic valve block, 14-Check valve, 15-Return oil filter, 16-Chassis lubrication system, 17-Relief valve, 18-Branch line A, 19-Cooler, 20-Branch line B, 21-Throttle valve, 22-Branch line C. Detailed Implementation

[0022] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0023] like Figure 1 As shown, this utility model provides a power reversing hydraulic system, including a main oil circuit 1, an oil inlet pipe 6, and an oil return pipe 8.

[0024] The main oil circuit 1 is connected to a reverse gear solenoid valve 2, a forward solenoid valve 3, a high-speed solenoid valve 4, and a PTO solenoid valve 5, which are controlled by hydraulic oil. The reverse gear solenoid valve 2, the forward solenoid valve 3, the high-speed solenoid valve 4, and the PTO solenoid valve 5 are arranged side by side. The main oil circuit 1 is equipped with a pressure port P, a medium pressure port MP, a pressure port P1, a return port T1, a control port C, and a drain port L1.

[0025] One end of the oil inlet pipe 6 is connected to the oil tank 7, and the other end of the oil inlet pipe 6 is connected to the pressure port P of the main oil circuit 1. A hydraulic pump A9, an oil inlet filter 10, and an accumulator 11 are installed sequentially on the oil inlet pipe 6. The accumulator 11 can store and release pressurized oil to stabilize the system pressure.

[0026] One end of the return oil line 8 is connected to the oil tank 7, and the other end of the return oil line 8 is connected to the pressure port P1 of the main oil line 1. The return oil line 8 is equipped with a hydraulic pump B12, a hydraulic valve block 13, a check valve 14, and a return oil filter 15 in sequence. The check valve 14 prevents oil backflow and ensures that the oil flows in the specified direction.

[0027] The control port C of the main oil circuit 1 is connected to the chassis lubrication system 16 through a branch pipe A18, and a cooler 19 is installed on the branch pipe A18.

[0028] The drain port L1 of the main oil circuit 1 is connected to the chassis lubrication system 16 through the branch pipe C22.

[0029] A relief valve 17 for pressure regulation is connected to the bypass of the main oil circuit 1. The oil in the main oil circuit 1 flows through the 20 bar relief valve 17. When the pressure exceeds 20 bar, the excess oil flows through the relief valve 17 and then through the return port T1 to the return oil tank 7. Another part of the oil enters the chassis lubrication system 16 after passing through the 5 bar control element.

[0030] The return oil line 8 is connected to the chassis lubrication system 16 via a branch line B20. The connection point between the branch line B20 and the return oil line 8 is located between the hydraulic valve block 13 and the check valve 14. A throttle valve 21 is installed on the branch line B20.

[0031] The specific working principle of this utility model is as follows:

[0032] The system integrates multiple functions such as reverse, forward, high speed, and PTO, switching between them via components like solenoid directional valves. Compared to traditional methods where multiple independent systems control different functions separately, this approach is more compact, saves space, and reduces system complexity and potential failure points. It features multiple pressure levels to precisely match the pressure requirements of different actuators and operating conditions, achieving fine pressure control and improving system stability and efficiency.

[0033] Gear control oil circuit: The oil in the main oil circuit enters the area controlled by the solenoid directional valve. To achieve reverse gear, the reverse solenoid directional valve is activated, and the oil flows to the reverse gear actuator; similarly, the forward, high speed, and PTO gears are controlled by the forward solenoid directional valve, high speed solenoid directional valve, and PTO solenoid directional valve, respectively, to control the oil flow to the corresponding actuator.

[0034] Pressure regulation: The oil in the main oil circuit passes through the 20 bar relief valve. When the pressure exceeds 20 bar, the excess oil flows through the relief valve and then through the return port T1 to the return oil tank. Another part of the oil enters the chassis lubrication system after passing through the 5 bar control element.

[0035] The return oil path incorporates a throttle valve and a cooler to control the flow and cool the return oil, helping to maintain the hydraulic oil in optimal working condition. It can not only be used for different gear control but also branch lines for chassis lubrication, demonstrating its versatility. Furthermore, the system's interfaces and component configurations offer good compatibility, facilitating future functional expansion or integration with other equipment.

[0036] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A power reversing hydraulic system characterized by: The main oil circuit (1), the oil inlet pipeline (6) and the oil return pipeline (8) are included, the reverse electromagnetic switching valve (2), the forward electromagnetic switching valve (3), the high-speed electromagnetic switching valve (4) and the PTO electromagnetic switching valve (5) are connected in the main oil circuit (1) and controlled to start by hydraulic oil; the main oil circuit (1) is provided with a pressure oil port P, a medium pressure oil port MP, a pressure oil port P1, a return oil port T1, a control oil port C and a drain port L1; the control oil port C of the main oil circuit (1) is connected with the chassis lubricating system (16) through the branch pipeline A (18); the drain port L1 of the main oil circuit (1) is connected with the chassis lubricating system (16) through the branch pipeline C (22); the oil return pipeline (8) is connected with the chassis lubricating system (16) through the branch pipeline B (20).

2. The power-shifting hydraulic system of claim 1, wherein: The reverse electromagnetic switching valve (2), the forward electromagnetic switching valve (3), the high-speed electromagnetic switching valve (4) and the PTO electromagnetic switching valve (5) are arranged side by side.

3. The power-shifting hydraulic system of claim 1, wherein: One end of the oil inlet pipeline (6) is connected with the oil tank (7), and the other end is connected with the pressure oil port P of the main oil circuit (1).

4. The power-shifting hydraulic system of claim 3, wherein: The hydraulic pump A (9), the oil inlet filter (10) and the accumulator (11) are sequentially installed on the oil inlet pipeline (6).

5. The power-shifting hydraulic system of claim 1, wherein: One end of the oil return pipeline (8) is connected with the oil tank (7), and the other end is connected with the pressure oil port P1 of the main oil circuit (1).

6. The power-shifting hydraulic system of claim 5, wherein: The hydraulic pump B (12), the hydraulic valve block (13), the one-way valve (14) and the oil return filter (15) are sequentially installed on the oil return pipeline (8).

7. The power-shifting hydraulic system of claim 1, wherein: The cooler (19) is installed on the branch pipeline A (18).

8. The power-shifting hydraulic system of claim 1, wherein: The overflow valve (17) for pressure regulation is connected on the bypass of the main oil circuit (1).

9. The power-shifting hydraulic system of claim 1, wherein: The connection position of the branch pipeline B (20) and the oil return pipeline (8) is between the hydraulic valve block (13) and the one-way valve (14), and the throttle valve (21) is installed on the branch pipeline B (20).

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