Steering oil cylinder control system

Abstract

The utility model provides a steering oil cylinder control system, which belongs to the technical field of loaders and comprises a hydraulic oil tank, a main pump, a steering gear, a front axle steering oil cylinder and a rear axle steering oil cylinder, an oil inlet of the main pump is connected with the hydraulic oil tank, and an oil outlet of the main pump is connected with the front axle steering oil cylinder through the steering gear. The front axle steering oil cylinder is connected with the rear axle steering oil cylinder through a three-position four-way electromagnetic valve; a gear pump is further arranged, the gear pump is connected with a locking device through a two-position three-way electromagnetic valve, and the locking device is arranged on a piston rod of the rear axle steering oil cylinder in a sleeved mode. When the loader is in a two-wheel steering mode, the piston rod of the rear axle steering oil cylinder does not deviate, and therefore the phenomenon that the loader deviates in the long-distance running process is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of excavator loader technology, and in particular relates to a steering cylinder control system. Background Technology

[0002] The steering system is one of the most important systems in a loader, directly affecting the machine's safety, operating efficiency, fuel consumption, and the driver's workload. Traditional loader steering systems control the front axle steering cylinder via a steering gear to steer the front wheels. Currently, some loader systems install a rear axle steering cylinder, connected to the front axle steering cylinder via a three-dimensional four-way solenoid valve. When the front wheels steer, the rear wheels steer synchronously, enabling switching between two-wheel steering, four-wheel steering, and crab-walking modes to ensure the loader can handle various complex road conditions.

[0003] When the loader is in two-wheel steering mode, the three-position four-way solenoid valve is in the neutral position. At this time, the piston rod of the rear axle steering cylinder is required not to move. However, due to the gap between the valve core and the valve body of the three-position four-way solenoid valve, leakage will occur, causing the piston rod of the rear axle steering cylinder to deviate. When the loader travels a long distance, it is easy to cause the loader to veer off course. Utility Model Content

[0004] In view of the defects or deficiencies in the existing technology, this utility model provides a steering cylinder control system that can ensure that the piston rod of the rear axle steering cylinder does not deviate when the loader is in two-wheel steering mode, thereby avoiding the phenomenon of the loader running off course during long-distance travel.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An embodiment of this utility model provides a steering cylinder control system, including a hydraulic oil tank, a main pump, a steering gear, a front axle steering cylinder and a rear axle steering cylinder. The oil inlet of the main pump is connected to the hydraulic oil tank, and the oil outlet of the main pump is connected to the front axle steering cylinder through the steering gear. The front axle steering cylinder is connected to the rear axle steering cylinder through a three-position four-way solenoid valve.

[0007] It is also equipped with a gear pump, which is connected to a locking device via a two-position three-way solenoid valve. The locking device is mounted on the piston rod of the rear axle steering cylinder.

[0008] Furthermore, the front axle steering cylinder is fixed on the front axle of the loader, and the rear axle steering cylinder is fixed on the rear axle of the loader.

[0009] Furthermore, the main pump outlet is connected to the P port of the steering gear.

[0010] Furthermore, the L port of the steering gear is connected to the Q2 port of the front axle steering cylinder, and the R port of the steering gear is connected to the Q1 port of the front axle steering cylinder.

[0011] Furthermore, the Q1 port of the front axle steering cylinder is connected to the P port of the three-position four-way solenoid valve, and the Q2 port of the front axle steering cylinder is connected to the T port of the three-position four-way solenoid valve.

[0012] Furthermore, the A port of the three-position four-way solenoid valve is connected to the H1 port of the rear axle steering cylinder, and the B port of the three-position four-way solenoid valve is connected to the H2 port of the rear axle steering cylinder.

[0013] Furthermore, the oil outlet of the gear pump is connected to the P port of a two-position three-way solenoid valve.

[0014] Furthermore, the T-port of the two-position three-way solenoid valve is connected to the oil tank.

[0015] Furthermore, the A port of the two-position three-way solenoid valve is connected to the H3 port of the locking device.

[0016] Furthermore, the locking device employs a conical disc spring type locking hydraulic cylinder.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention features a locking device fitted onto the piston cylinder of the rear axle steering cylinder. The locking device is connected to a gear pump via a two-position three-way solenoid valve. When the loader is in two-wheel steering mode, the gear pump does not supply oil to the locking device, and the locking device locks the rear axle steering cylinder, preventing the piston cylinder of the rear axle steering cylinder from shifting and ensuring that the loader does not veer off course during long-distance travel. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the steering cylinder control system in an embodiment of the present invention;

[0020] The components include: 1. Hydraulic oil tank; 2. Main pump; 3. Gear pump; 4. Two-position three-way solenoid valve; 5. Steering gear; 6. Front axle steering cylinder; 7. Locking device; 8. Rear axle steering cylinder; and 9. Three-position four-way solenoid valve. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] A typical embodiment of this utility model is as follows: Figure 1 As shown, a steering cylinder control system includes a hydraulic oil tank 1, a main pump 2, a steering gear 5, a front axle steering cylinder 6, and a rear axle steering cylinder 8. The front axle steering cylinder 6 is fixed on the front axle of the loader and is used to control the steering of the front wheels of the loader. The rear axle steering cylinder 8 is fixed on the rear axle of the loader and is used to control the steering of the rear wheels of the loader.

[0023] The main pump 2's inlet is connected to the hydraulic oil tank 1, and the main pump 2's outlet is connected to the P port of the steering gear 5. The main pump 2 draws oil from the hydraulic oil tank 1, and after being pressurized, it enters the P port of the steering gear 5.

[0024] The L port of steering gear 5 is connected to the Q2 port of front axle steering cylinder 6, and the R port of steering gear 5 is connected to the Q1 port of front axle steering cylinder 6. When the steering wheel is rotated counterclockwise, hydraulic oil flows out from the L port of steering gear 5 and enters the Q2 port of front axle steering cylinder 6 through the oil pipe. The piston rod on the side near the Q2 port retracts, and the wheel rotates to the left. When the steering wheel is rotated clockwise, hydraulic oil flows out from the R port of steering gear 5 and enters the Q1 port of front axle steering cylinder 6 through the oil pipe. The piston rod on the side near the Q1 port retracts, and the wheel rotates to the right.

[0025] The front axle steering cylinder 6 is connected to the rear axle steering cylinder 8 via a three-position four-way solenoid valve 9. Specifically, the Q1 port of the front axle steering cylinder 6 is connected to the P port of the three-position four-way solenoid valve 9, the Q2 port of the front axle steering cylinder 6 is connected to the T port of the three-position four-way solenoid valve 9, the A port of the three-position four-way solenoid valve 9 is connected to the H1 port of the rear axle steering cylinder 8, and the B port of the three-position four-way solenoid valve 9 is connected to the H2 port of the rear axle steering cylinder 8. The three-position four-way solenoid valve 9 enables the rear wheels of the loader to rotate, thus achieving the conversion between four-wheel steering mode and crab mode.

[0026] A gear pump 3 is also provided. The oil inlet of the gear pump 3 is connected to the hydraulic oil tank 1. The oil outlet of the gear pump 3 is connected to the locking device 7 through a two-position three-way solenoid valve 4. Specifically, the oil outlet of the gear pump 3 is connected to the P port of the two-position three-way solenoid valve 4. The T port of the two-position three-way solenoid valve 4 is connected to the oil tank. The A port of the two-position three-way solenoid valve 4 is connected to the H3 port of the locking device 7, thereby supplying oil to the locking device 7 through the gear pump 3.

[0027] The locking device 7 adopts a conical disc spring type locking hydraulic cylinder, which is sleeved on the piston rod of the rear axle steering cylinder 8. Under the preload of the internal disc spring, the conical disc spring type locking hydraulic cylinder causes static friction between the internal device and the piston rod to achieve a locking state, and the piston rod cannot move, effectively solving the problem of vehicle deviation when traveling long distances.

[0028] In this embodiment, the conical disc spring locking hydraulic cylinder is a common locking hydraulic cylinder on the market, and the locking state can be controlled hydraulically.

[0029] Working principle

[0030] Two-wheel steering mode: The three-position four-way solenoid valve and the two-position three-way solenoid valve are not energized. The H3 port of the locking device is connected to the oil tank. At this time, the locking device does not supply hydraulic oil. Under the preload of the internal disc spring, the locking device generates static friction between the internal device and the piston rod to achieve a locking state. The piston rod cannot move, effectively solving the problem of vehicle deviation during long-distance driving.

[0031] In four-wheel steering mode, the Y2 of the three-position four-way solenoid valve is energized, and the two-position three-way solenoid valve is also energized. The H3 port of the locking device is connected to the oil outlet of the gear pump group, and hydraulic oil is introduced into the locking device. Under the action of hydraulic oil, the locking device releases the preload of the disc spring. The rear axle steering cylinder can extend and retract through the oil inlets H1 and H2, so that the rotation direction of the rear wheels of the loader is opposite to that of the front wheels, thereby realizing four-wheel steering and reducing the turning radius of the loader.

[0032] Crab mode: When the Y1 of the three-position four-way solenoid valve is energized, the two-position three-way solenoid valve is also energized. The H3 port of the locking device is connected to the oil outlet of the gear pump group. Under the action of hydraulic oil, the locking device releases the preload of the disc spring. The rear axle steering cylinder can extend and retract through the oil inlets H1 and H2, so that the rotation direction of the rear wheel of the loader is the same as that of the front wheel, thereby realizing the loader's diagonal driving.

[0033] This invention features a locking device fitted onto the piston cylinder of the rear axle steering cylinder. The locking device is connected to a gear pump via a two-position three-way solenoid valve. When the loader is in two-wheel steering mode, the gear pump does not supply oil to the locking device, and the locking device locks the rear axle steering cylinder, preventing the piston cylinder of the rear axle steering cylinder from shifting and ensuring that the loader does not veer off course during long-distance travel.

[0034] 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 steering cylinder control system, characterized in that, It includes a hydraulic oil tank, a main pump, a steering gear, a front axle steering cylinder, and a rear axle steering cylinder. The oil inlet of the main pump is connected to the hydraulic oil tank, and the oil outlet of the main pump is connected to the front axle steering cylinder through the steering gear. The front axle steering cylinder is connected to the rear axle steering cylinder through a three-position four-way solenoid valve. It is also equipped with a gear pump, which is connected to a locking device via a two-position three-way solenoid valve. The locking device is mounted on the piston rod of the rear axle steering cylinder.

2. The steering cylinder control system as described in claim 1, characterized in that, The front axle steering cylinder is fixed on the front axle of the loader, and the rear axle steering cylinder is fixed on the rear axle of the loader.

3. The steering cylinder control system as described in claim 1, characterized in that, The main pump outlet is connected to the P port of the steering gear.

4. A steering cylinder control system as described in claim 3, characterized in that, The L port of the steering gear is connected to the Q2 port of the front axle steering cylinder, and the R port of the steering gear is connected to the Q1 port of the front axle steering cylinder.

5. A steering cylinder control system as described in claim 4, characterized in that, The Q1 port of the front axle steering cylinder is connected to the P port of the three-position four-way solenoid valve, and the Q2 port of the front axle steering cylinder is connected to the T port of the three-position four-way solenoid valve.

6. A steering cylinder control system as described in claim 5, characterized in that, The A port of the three-position four-way solenoid valve is connected to the H1 port of the rear axle steering cylinder, and the B port of the three-position four-way solenoid valve is connected to the H2 port of the rear axle steering cylinder.

7. A steering cylinder control system as described in claim 1, characterized in that, The oil outlet of the gear pump is connected to the P port of the two-position three-way solenoid valve.

8. A steering cylinder control system as described in claim 7, characterized in that, The T-port of the two-position three-way solenoid valve is connected to the oil tank.

9. A steering cylinder control system as described in claim 8, characterized in that, The A port of the two-position three-way solenoid valve is connected to the H3 port of the locking device.

10. A steering cylinder control system as described in claim 1, characterized in that, The locking device uses a conical disc spring type locking hydraulic cylinder.

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