Novel valve for steering hydraulic system of special vehicle

Abstract

The utility model discloses novel special automobile steering hydraulic system valve, including main body valve, main body valve is connected with left electromagnetic valve and right electromagnetic valve respectively, and is provided with the valve core post in main body valve, and the inner chamber that is provided with the valve core post is opposite in main body valve, and the bottom of valve core post is provided with the valve core, and the inner chamber is divided into right rotation pressure chamber and left rotation pressure chamber by valve core, and is provided with the buffer flow channel in valve core. Hydraulic oil enters into right rotation pressure chamber of main valve body from left to right, and exerts the right action to valve core, and then can make valve core post above valve core move right, until its action to assist force cylinder, plays right rotation assist force effect. And if need to reduce the force degree of assistance, can open and close electromagnetic one way mechanism, at this time, the inside of electromagnetic one way mechanism is powered off, and the magnetic attraction is small, and part of hydraulic oil can push electromagnetic one way mechanism, and enter into buffer flow channel, and then enter into the oil return port, because the hydraulic oil that enters into buffer flow channel can not produce pressure to valve core, so can reduce the action to valve core.

Description

Technical Field

[0001] This utility model relates to a valve body, specifically to a novel special automotive steering hydraulic system valve, belonging to the technical field of vehicle steering systems. Background Technology

[0002] In vehicle steering systems, there are generally two types: hydraulic power steering and electromagnetic power steering. For special vehicles, hydraulic power steering, which is more reliable and has been around for a longer period, is usually chosen. In common hydraulic power steering systems, during left or right turns, hydraulic oil is selectively injected into the main valve in different directions via a left or right solenoid valve. This allows the valve stem to move in different directions, driving the power steering cylinder. Therefore, the displacement distance of the valve stem in different directions directly determines the amount of power steering assistance. Typically, because the flow rate of hydraulic oil into the main valve is constant, the displacement of the valve stem is also consistent per unit time. This results in the inability to adjust the power steering assistance, presenting significant limitations. Therefore, further improvements are needed. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a new type of special vehicle steering hydraulic system valve, which has adjustable power assist, is easy to operate, has reasonable control, and has a simple structure.

[0004] The technical solution adopted by this utility model is as follows: a novel special vehicle steering hydraulic system valve, including a main valve, which is connected to a left solenoid valve and a right solenoid valve respectively, and a valve core column is provided inside the main valve; an inner cavity is provided inside the main valve against the valve core column; a valve core is provided at the bottom of the valve core column; the inner cavity is divided into a right-turn pressure chamber and a left-turn pressure chamber by the valve core; and a buffer flow channel is provided inside the valve core.

[0005] Furthermore, the inner cavity is divided into a left oil cavity and a right oil cavity by the valve core; the left oil cavity is provided with a first oil inlet and a first oil return port; the right oil cavity is provided with a second oil inlet and a second oil return port.

[0006] Furthermore, the first oil inlet is connected to the first oil outlet of the left solenoid valve; the first oil return port is connected to the oil storage chamber; the second oil inlet is connected to the second oil outlet of the right solenoid valve; the second oil return port is connected to the oil storage chamber; and the left and right solenoid valves each have on / off valve cores.

[0007] Furthermore, the buffer flow channel includes a main flow channel and branch flow channels; the main flow channel is vertically arranged inside the valve core; the branch flow channels are symmetrically arranged on both sides of the main flow channel; the branch flow channels and the main flow channel are interconnected.

[0008] Furthermore, the valve core has secondary return ports on both sides of its side surface opposite to the branch channel; each secondary return port is equipped with an electromagnetic one-way mechanism; the two secondary return ports are respectively connected to the first return port and the second return port via hoses.

[0009] Furthermore, the electromagnetic one-way mechanism includes a plug; a guide groove is provided on the side wall of the valve core relative to the plug; a guide protrusion is provided on the outer side of the plug; the guide protrusion slides within the guide groove.

[0010] Furthermore, the electromagnetic one-way mechanism also includes an electromagnet disposed in the guide groove; a magnetic block of opposite poles is disposed on the side of the guide protrusion near the electromagnet; and a spring is disposed on the other side of the guide protrusion opposite the electromagnet.

[0011] This invention has the following beneficial effects: Taking right turn as an example, the right solenoid valve is closed, and the left solenoid valve connects the main valve body and the pump body. Hydraulic oil enters the right turn pressure chamber of the main valve body from left to right, and applies a rightward force to the valve core, thereby causing the valve core column above the valve core to move to the right until it acts on the booster cylinder, thus providing right turn assist. If it is necessary to reduce the assist force, the solenoid one-way mechanism can be opened and closed. At this time, the internal power of the solenoid one-way mechanism is de-energized, the magnetic attraction is small, and some hydraulic oil can push the solenoid one-way mechanism and enter the buffer flow channel, and then enter the return port. Since the hydraulic oil entering the buffer flow channel cannot exert pressure on the valve core, but instead passes through the solenoid one-way mechanism, the force on the valve core is reduced, the displacement is reduced, and thus the assist force can be reduced. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is a partial structural diagram of the valve core.

[0014] Figure 3 This is a schematic diagram of an electromagnetic unidirectional mechanism.

[0015] Wherein: 1 is the main valve, 2 is the valve core column, 3 is the inner cavity, 4 is the valve core, 5 is the right-turn pressure chamber, 6 is the left-turn pressure chamber, 7 is the first oil inlet, 8 is the first oil return port, 9 is the second oil inlet, 10 is the second oil return port, 11 is the main flow channel, 12 is the branch flow channel, 13 is the secondary return port, 14 is the plug, 15 is the guide groove, 16 is the guide protrusion, 17 is the electromagnet, and 18 is the spring. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] See Figures 1-3 This application discloses a novel special vehicle steering hydraulic system valve, including a main valve, which is connected to a left solenoid valve and a right solenoid valve respectively. A valve core column 2 is provided inside the main valve 1. An inner cavity 3 is provided inside the main valve 1 against the valve core column 2. A valve core 4 is provided at the bottom of the valve core column 2. The inner cavity 3 is divided by the valve core 4 into a right-turn pressure chamber 5 and a left-turn pressure chamber 6. A buffer flow channel is provided inside the valve core 4.

[0018] Furthermore, the right-turn pressure chamber 5 is provided with a first oil inlet 7 and a first oil return port 8; the left-turn pressure chamber 6 is provided with a second oil inlet 9 and a second oil return port 10.

[0019] Furthermore, the first oil inlet 7 is connected to the first oil outlet of the left solenoid valve; the first oil return port 8 is connected to the oil storage chamber; the second oil inlet 9 is connected to the second oil outlet of the right solenoid valve; the second oil return port 10 is connected to the oil storage chamber; and the left and right solenoid valves each have on / off valve cores.

[0020] Furthermore, the buffer flow channel includes a main flow channel 11 and a branch flow channel 12; the main flow channel 11 is vertically arranged inside the valve core 4; the branch flow channels 12 are symmetrically arranged on both sides of the main flow channel; the branch flow channels 12 and the main flow channel 11 are interconnected.

[0021] Furthermore, the valve core 4 has secondary return ports 13 on both sides of its side surface opposite to the branch channel 12; each of the secondary return ports 13 is equipped with an electromagnetic one-way mechanism; the two secondary return ports 13 are respectively connected to the first return port 8 and the second return port 10 through hoses.

[0022] Furthermore, the electromagnetic one-way mechanism includes a plug 14; a guide groove 15 is provided on the side wall of the valve core 4 relative to the plug 14; a guide protrusion 16 is provided on the outer side of the plug; the guide protrusion 16 slides within the guide groove 15.

[0023] Furthermore, the electromagnetic one-way mechanism also includes an electromagnet 17 disposed in the guide groove 15; a magnetic block of opposite poles is disposed on the side of the guide protrusion 16 near the electromagnet 17; and a spring 18 is disposed on the other side of the guide protrusion 16 opposite to the electromagnet 17.

[0024] Working principle: When right-turn assist is required, hydraulic oil, under the action of the pump body, passes through the left solenoid valve and enters the right-turn pressure chamber 5 through the first oil inlet 7. This pressure applies to the valve core 4, pushing it to move, which in turn moves the valve core column 2 connected to the valve core 4 to the right, thus providing right-turn assist. During return, the hydraulic oil passes through the first return port 8, its check valve, and then returns to the oil reservoir via the left solenoid valve. In this case, because the hydraulic oil volume is consistent, the displacement of the valve core column 2 remains unchanged, resulting in a constant assist force.

[0025] If the current assist force is too high and needs to be reduced, the power supply to the electromagnet 17 is interrupted, preventing the electromagnet 17 from generating magnetic attraction on the plug 14. The spring 18 alone cannot keep the plug 14 stationary. At this time, the hydraulic oil will push the plug 14 to move, creating a gap between the plug 14 and the valve core sidewall. The hydraulic oil can then pass through and enter the main flow channel 11 and the branch flow channel 12, and return through the first return port 8. Because some hydraulic oil directly passes through the valve core sidewall and enters its interior, the pressure exerted by this portion of hydraulic oil on the valve core is relatively small. In other words, within a unit flow rate, the force exerted by the same amount of hydraulic oil on the valve core is smaller, resulting in a relatively smaller displacement of the valve core column 2, thereby reducing the assist force.

[0026] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A novel hydraulic steering system valve for special-purpose vehicles, comprising a main valve, wherein the main valve is connected to a left solenoid valve and a right solenoid valve respectively, characterized in that: The main valve (1) is provided with a valve core column (2); the main valve (1) is provided with an inner cavity (3) that abuts against the valve core column (2); the bottom of the valve core column (2) is provided with a valve core (4); the inner cavity (3) is divided by the valve core (4) into a right-turn pressure chamber (5) and a left-turn pressure chamber (6); the valve core (4) is provided with a buffer flow channel.

2. The novel special vehicle steering hydraulic system valve according to claim 1, characterized in that: The right-turn pressure chamber (5) is provided with a first oil inlet (7) and a first oil return port (8); the left-turn pressure chamber (6) is provided with a second oil inlet (9) and a second oil return port (10).

3. The novel special vehicle steering hydraulic system valve according to claim 2, characterized in that: The first oil inlet (7) is connected to the first oil outlet of the left solenoid valve; the first oil return port (8) is connected to the oil storage chamber; the second oil inlet (9) is connected to the second oil outlet of the right solenoid valve; the second oil return port (10) is connected to the oil storage chamber; the left solenoid valve and the right solenoid valve are respectively equipped with on / off valve cores.

4. The novel special vehicle steering hydraulic system valve according to claim 3, characterized in that: The buffer flow channel includes a main flow channel (11) and a branch flow channel (12); the main flow channel (11) is vertically arranged inside the valve core (4); the branch flow channels (12) are symmetrically arranged on both sides of the main flow channel; the branch flow channels (12) and the main flow channel (11) are interconnected.

5. The novel special vehicle steering hydraulic system valve according to claim 4, characterized in that: The valve core (4) has secondary return ports (13) on both sides opposite the branch channel (12); each of the secondary return ports (13) is provided with an electromagnetic one-way mechanism; the two secondary return ports (13) are connected to the first return port (8) and the second return port (10) through hoses respectively.

6. The novel special vehicle steering hydraulic system valve according to claim 5, characterized in that: The electromagnetic one-way mechanism includes a plug (14); a guide groove (15) is provided on the side wall of the valve core (4) relative to the plug (14); a guide protrusion (16) is provided on the outside of the plug; the guide protrusion (16) slides in the guide groove (15).

7. The novel special vehicle steering hydraulic system valve according to claim 6, characterized in that: The electromagnetic one-way mechanism also includes an electromagnet (17) disposed in the guide groove (15); a opposite-pole magnetic block is disposed on the side of the guide protrusion (16) near the electromagnet (17); a spring (18) is disposed on the other side of the guide protrusion (16) opposite to the electromagnet (17).

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