Novel steering brake valve

Abstract

The utility model relates to a novel steering brake valve, and belongs to the technical field of steering control of engineering vehicles. An oil outlet of the first electromagnetic proportional valve is connected to an inlet of a one-way valve A through a first one-way oil way, an outlet of the one-way valve A is connected to a first execution element through a second one-way oil way, and an oil outlet of the second electromagnetic proportional valve is connected to an inlet of a one-way valve B through a third one-way oil way. An outlet of the one-way valve B is connected to a second execution element through a fourth one-way oil way, the reversing valve A is a two-position four-way hydraulic reversing valve, a port P of the reversing valve A is connected with the main oil way through a first communication oil way, and a second control port of the reversing valve A is connected to a third one-way oil way. The novel steering brake valve has the advantages that when output pressure of the first electromagnetic proportional valve and the second electromagnetic proportional valve drops instantly, oil pressure is provided by the reversing valve, and the influence of instant pressure drop of the novel steering brake valve on an execution element is reduced by modifying a hydraulic loop of the valve body.

Description

Technical Field

[0001] The utility model relates to a novel steering brake valve, belonging to the technical field of steering control of engineering vehicles. Background Art

[0002] With the development of technology, the actions of construction machinery are controlled by control programs for various valve bodies to realize the charging and discharging of oil in different oil circuits, thereby controlling the actions of various actuating elements. Among them, the novel steering brake valve is a valve body that has been gradually popularized in large construction machinery, which controls the construction machinery to achieve stable steering and braking actions, mainly controlling 4 oil circuits, respectively controlling the clutches for left braking and right braking and the clutches for left steering and right steering.

[0003] The patent with the patent number CN200910012701.6 discloses a novel steering brake valve for a 520-horsepower bulldozer. It is characterized in that the valve system is a combined valve integrated by two left and right arranged steering valves, two left and right arranged brake valves and a self-locking valve. The steering valve, brake valve and self-locking valve are integrated in a valve body I with internal oil passages. The valve body I is connected to the valve body II through bolts I and sealing gasket III, and at the same time is connected to the valve body III through bolts II, a plate and sealing gaskets I and II; a brake link mechanism and a steering link mechanism are installed on the valve body III. The steering link mechanism is freely connected to the ejector rod I of the steering valve through the eccentric block thereon, and the brake link mechanism is freely connected to the ejector rod II of the brake valve; a self-locking link mechanism is installed on the valve body II and is key-connected to the one-way slide valve; the combined valve is installed on the bulldozer through bolts III.

[0004] The current technology has incomplete considerations and has the following drawbacks: Due to the miniaturization of the valve body, the actions of the internal valve stems have relatively high requirements for the cleanliness of the oil. As the working time increases, the internal oil gradually deteriorates, and during the action execution, the situation of frequent instantaneous pressure reduction and recovery occurs, which easily damages the friction plates inside the clutch.

[0005] To solve one of the above problems, a novel steering brake valve is urgently needed. Summary of the Utility Model

[0006] According to the deficiencies in the above prior art, the technical problem to be solved by the utility model is: how to realize that when the output pressures of the first electromagnetic proportional valve and the second electromagnetic proportional valve drop instantaneously, the reversing valve provides oil pressure to reduce the influence of the instantaneous pressure drop of the novel steering brake valve on the actuating element. For this purpose, a novel steering brake valve is provided.

[0007] The novel steering brake valve described in the utility model includes a main oil circuit, and is characterized in that it further includes a reversing valve A, a first electromagnetic proportional valve, and a second electromagnetic proportional valve. The oil inlets of the first electromagnetic proportional valve and the second electromagnetic proportional valve are both connected to the main oil circuit. The oil outlet of the first electromagnetic proportional valve is connected to the inlet of a check valve A through a first one-way oil circuit. The outlet of the check valve A is connected to a first actuator through a second one-way oil circuit. The oil outlet of the second electromagnetic proportional valve is connected to the inlet of a check valve B through a third one-way oil circuit. The outlet of the check valve B is connected to a second actuator through a fourth one-way oil circuit. The reversing valve A is a two-position four-way hydraulic reversing valve. The P port of the reversing valve A is connected to the main oil circuit through a first connecting oil circuit, and an overflow valve A is installed on the first connecting oil circuit. The T port of the reversing valve A is connected to the fuel tank. The A port of the reversing valve A is connected to the second one-way oil circuit. The B port of the reversing valve A is connected to the fourth one-way oil circuit. The first control port of the reversing valve A is connected to the first one-way oil circuit. The second control port of the reversing valve A is connected to the third one-way oil circuit.

[0008] When the output pressures of the first electromagnetic proportional valve and the second electromagnetic proportional valve drop instantaneously, the reversing valve provides oil pressure to reduce the impact of the instantaneous pressure drop of the novel steering brake valve on the actuator by modifying the hydraulic circuit of the valve body.

[0009] Preferably, it further includes a reversing valve B, a third electromagnetic proportional valve, and a fourth electromagnetic proportional valve. The oil inlets of the third electromagnetic proportional valve and the fourth electromagnetic proportional valve are both connected to the main oil circuit. The oil outlet of the third electromagnetic proportional valve is connected to the inlet of a check valve C through a fifth one-way oil circuit. The outlet of the check valve C is connected to a third actuator through a sixth one-way oil circuit. The oil outlet of the fourth electromagnetic proportional valve is connected to the inlet of a check valve D through a seventh one-way oil circuit. The outlet of the check valve D is connected to a fourth actuator through an eighth one-way oil circuit.

[0010] Preferably, the reversing valve B is a two-position four-way hydraulic reversing valve. The P port of the reversing valve B is connected to the main oil circuit through a second connecting oil circuit, and an overflow valve B is installed on the second connecting oil circuit. The T port of the reversing valve B is connected to the fuel tank. The A port of the reversing valve B is connected to the sixth one-way oil circuit. The B port of the reversing valve B is connected to the eighth one-way oil circuit. The first control port of the reversing valve B is connected to the fifth one-way oil circuit. The second control port of the reversing valve B is connected to the fifth one-way oil circuit.

[0011] Preferably, the first actuator and the second actuator are a left steering clutch cylinder and a right steering clutch cylinder respectively.

[0012] Preferably, the third actuator and the fourth actuator are a left brake clutch cylinder and a right brake clutch cylinder respectively.

[0013] Preferably, the first electromagnetic proportional valve, the second electromagnetic proportional valve, the third electromagnetic proportional valve, the fourth electromagnetic proportional valve, the reversing valve A, the reversing valve B, the overflow valve A, the overflow valve B, the check valve A, the check valve B, the check valve C, and the check valve D are all integrated on the same valve body.

[0014] Compared with the prior art, the present utility model has the following beneficial effects:

[0015] For the novel steering brake valve of the present utility model, when the output pressures of the first electromagnetic proportional valve and the second electromagnetic proportional valve drop instantaneously, the reversing valve A provides oil pressure. When the output pressures of the third electromagnetic proportional valve and the fourth electromagnetic proportional valve drop instantaneously, the reversing valve B provides oil pressure. By modifying the hydraulic circuit of the valve body, the impact of the instantaneous pressure drop of the novel steering brake valve on the actuating element is reduced.

[0016] For the novel steering brake valve of the present utility model, the first actuating element, the second actuating element, the third actuating element, and the fourth actuating element respectively control the clutches for left and right brakes and the clutches for left and right steering, so as to control the construction machinery to achieve stable steering and braking actions.

[0017] For the novel steering brake valve of the present utility model, the first electromagnetic proportional valve, the second electromagnetic proportional valve, the third electromagnetic proportional valve, the fourth electromagnetic proportional valve, the reversing valve A, the reversing valve B, the overflow valve A, the overflow valve B, the check valve A, the check valve B, the check valve C, and the check valve D are all integrated on the same valve body, with a reasonable structure and being convenient for production and installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally denoted by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0019] Figure 1 It is the hydraulic control schematic diagram of the present utility model;

[0020] Figure 2 It is the structure of the present utility model Figure 1 ;

[0021] Figure 3 It is the structure of the present utility model Figure 2 。

[0022] In the figure: 1. First electromagnetic proportional valve; 2. Reversing valve A; 3. Overflow valve A; 4. Check valve A; 5. First actuating element; 6. Second electromagnetic proportional valve; 7. Check valve B; 8. Second actuating element. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following further describes the present utility model in conjunction with the accompanying drawings: The following further illustrates the present utility model through specific embodiments, but it is not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present utility model.

[0024] Example 1, as Figure 1 shown, the novel steering brake valve includes a main oil circuit, and also includes a reversing valve A2, a first electromagnetic proportional valve 1, and a second electromagnetic proportional valve 6. The oil inlets of the first electromagnetic proportional valve 1 and the second electromagnetic proportional valve are both connected to the main oil circuit. The oil outlet of the first electromagnetic proportional valve 1 is connected to the inlet of a check valve A4 through a first one-way oil circuit. The outlet of the check valve A4 is connected to a first actuator 5 through a second one-way oil circuit. The oil outlet of the second electromagnetic proportional valve 6 is connected to the inlet of a check valve B7 through a third one-way oil circuit. The outlet of the check valve B7 is connected to a second actuator 8 through a fourth one-way oil circuit. The reversing valve A2 is a two-position four-way hydraulic reversing valve. The P port of the reversing valve A2 is connected to the main oil circuit through a first connecting oil circuit. An overflow valve A3 is installed on the first connecting oil circuit. The T port of the reversing valve A2 is connected to the fuel tank. The A port of the reversing valve A2 is connected to the second one-way oil circuit. The B port of the reversing valve A2 is connected to the fourth one-way oil circuit. The first control port of the reversing valve A2 is connected to the first one-way oil circuit. The second control port of the reversing valve A2 is connected to the third one-way oil circuit.

[0025] When the output pressures of the first electromagnetic proportional valve 1 and the second electromagnetic proportional valve 6 instantaneously drop, the oil pressure is provided by the reversing valve A2, and the influence of the instantaneous pressure drop of the novel steering brake valve on the actuator is reduced by modifying the hydraulic circuit of the valve body.

[0026] Example 2, as Figures 1-3As shown in the figure, the novel steering brake valve includes a main oil circuit, and also includes a reversing valve A2, a first electro-hydraulic proportional valve 1, and a second electro-hydraulic proportional valve 6. The oil inlets of the first electro-hydraulic proportional valve 1 and the second electro-hydraulic proportional valve are both connected to the main oil circuit. The oil outlet of the first electro-hydraulic proportional valve 1 is connected to the inlet of a one-way valve A4 through a first one-way oil circuit. The outlet of the one-way valve A4 is connected to a first actuator 5 through a second one-way oil circuit. The oil outlet of the second electro-hydraulic proportional valve 6 is connected to the inlet of a one-way valve B7 through a third one-way oil circuit. The outlet of the one-way valve B7 is connected to a second actuator 8 through a fourth one-way oil circuit. The reversing valve A2 is a two-position four-way hydraulic reversing valve. The P port of the reversing valve A2 is connected to the main oil circuit through a first connecting oil circuit. An overflow valve A3 is installed on the first connecting oil circuit. The T port of the reversing valve A2 is connected to the fuel tank. The A port of the reversing valve A2 is connected to the second one-way oil circuit. The B port of the reversing valve A2 is connected to the fourth one-way oil circuit. The first control port of the reversing valve A2 is connected to the first one-way oil circuit. The second control port of the reversing valve A2 is connected to the third one-way oil circuit.

[0027] Further, it also includes a reversing valve B, a third electro-hydraulic proportional valve, and a fourth electro-hydraulic proportional valve. The oil inlets of the third electro-hydraulic proportional valve and the fourth electro-hydraulic proportional valve are both connected to the main oil circuit. The oil outlet of the third electro-hydraulic proportional valve is connected to the inlet of a one-way valve C through a fifth one-way oil circuit. The outlet of the one-way valve C is connected to a third actuator through a sixth one-way oil circuit. The oil outlet of the fourth electro-hydraulic proportional valve is connected to the inlet of a one-way valve D through a seventh one-way oil circuit. The outlet of the one-way valve D is connected to a fourth actuator through an eighth one-way oil circuit.

[0028] Further, the reversing valve B is a two-position four-way hydraulic reversing valve. The P port of the reversing valve B is connected to the main oil circuit through a second connecting oil circuit. An overflow valve B is installed on the second connecting oil circuit. The T port of the reversing valve B is connected to the fuel tank. The A port of the reversing valve B is connected to the sixth one-way oil circuit. The B port of the reversing valve B is connected to the eighth one-way oil circuit. The first control port of the reversing valve B is connected to the fifth one-way oil circuit. The second control port of the reversing valve B is connected to the fifth one-way oil circuit. When the output pressures of the first electro-hydraulic proportional valve 1 and the second electro-hydraulic proportional valve 6 drop instantaneously, the reversing valve A2 provides oil pressure. When the output pressures of the third electro-hydraulic proportional valve and the fourth electro-hydraulic proportional valve drop instantaneously, the reversing valve B provides oil pressure. By modifying the hydraulic circuit of the valve body, the impact of the instantaneous pressure drop of the novel steering brake valve on the actuator is reduced. The first actuator 5, the second actuator 8, the third actuator, and the fourth actuator respectively control the clutches for left and right brakes and the clutches for left and right steering, controlling the construction machinery to achieve stable steering and braking actions.

[0029] Furthermore, the first actuating element 5 and the second actuating element 8 are respectively a left steering clutch oil cylinder and a right steering clutch oil cylinder.

[0030] Furthermore, the third actuating element and the fourth actuating element are respectively a left brake clutch oil cylinder and a right brake clutch oil cylinder.

[0031] Furthermore, the first electromagnetic proportional valve 1, the second electromagnetic proportional valve 6, the third electromagnetic proportional valve, the fourth electromagnetic proportional valve, the reversing valve A2, the reversing valve B, the overflow valve A3, the overflow valve B, the one-way valve A4, the one-way valve B7, the one-way valve C, and the one-way valve D are all integrated on the same valve body.

[0032] For the novel steering and braking valve of the present utility model, when the output pressures of the first electromagnetic proportional valve and the second electromagnetic proportional valve drop instantaneously, the reversing valve A provides the oil pressure. When the output pressures of the third electromagnetic proportional valve and the fourth electromagnetic proportional valve drop instantaneously, the reversing valve B provides the oil pressure. By modifying the hydraulic circuit of the valve body, the influence of the instantaneous pressure drop of the novel steering and braking valve on the actuating element is reduced.

[0033] For the novel steering and braking valve of the present utility model, the first actuating element, the second actuating element, the third actuating element, and the fourth actuating element respectively control the clutches for left braking and right braking and the clutches for left steering and right steering, and control the construction machinery to achieve stable steering and braking actions.

[0034] For the novel steering and braking valve of the present utility model, the first electromagnetic proportional valve, the second electromagnetic proportional valve, the third electromagnetic proportional valve, the fourth electromagnetic proportional valve, the reversing valve A, the reversing valve B, the overflow valve A, the overflow valve B, the one-way valve A, the one-way valve B, the one-way valve C, and the one-way valve D are all integrated on the same valve body, with a reasonable structure, which is convenient for production and installation.

[0035] Explanation of related terms

[0036] Proportional valve: The full name is electromagnetic proportional valve, which is a kind of hydraulic valve that converts the input electrical signal into force or displacement in proportion, so as to continuously control parameters such as pressure and flow rate.

[0037] Hydraulically controlled reversing valve: A reversing valve actuated by the pressure of the pilot fluid. When the spool moves a certain distance to the right, the pressure oil output by the hydraulic pump flows into the left chamber of the hydraulic cylinder, and the oil in the right chamber of the hydraulic cylinder flows back to the oil tank, and the piston of the hydraulic cylinder moves to the right; conversely, if the spool moves a certain distance to the left, the fluid flow reverses and the piston moves to the left.

[0038] One-way valve: The fluid can only flow along the inlet, and the medium at the outlet cannot flow back.

[0039] Overflow valve: Also known as a return valve, it is a kind of hydraulic pressure control valve.

[0040] Actuating element: A device that converts the hydraulic pressure energy into mechanical energy.

[0041] Accumulator: An energy storage device in a hydraulic and pneumatic system.

[0042] The above shows and describes the basic principle, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

[0043] Matters not described in detail in the present invention are all well-known technologies to those skilled in the art of this technology.

Claims

1. A new type of steering brake valve, including a main oil circuit, characterized in that: The invention also comprises a reversing valve A (2), a first electromagnetic proportional valve (1), and a second electromagnetic proportional valve (6), wherein the oil inlets of the first electromagnetic proportional valve (1) and the second electromagnetic proportional valve are both connected to the main oil circuit, the oil outlet of the first electromagnetic proportional valve (1) is connected to the inlet of the one-way valve A (4) through a first one-way oil circuit, the outlet of the one-way valve A (4) is connected to the first actuator (5) through a second one-way oil circuit, the oil outlet of the second electromagnetic proportional valve (6) is connected to the inlet of the one-way valve B (7) through a third one-way oil circuit, the outlet of the one-way valve B (7) is connected to the inlet of the one-way valve B (7) through a fourth one-way oil circuit. The reversing valve A (2) is a two-position four-way hydraulic reversing valve. The P port of the reversing valve A (2) is connected to the main oil circuit via a first connecting oil circuit. A relief valve A (3) is installed on the first connecting oil circuit. The T port of the reversing valve A (2) is connected to the oil tank. The A port of the reversing valve A (2) is connected to the second one-way oil circuit. The B port of the reversing valve A (2) is connected to the fourth one-way oil circuit. The first control port of the reversing valve A (2) is connected to the first one-way oil circuit. The second control port of the reversing valve A (2) is connected to the third one-way oil circuit.

2. According to claim 1, the new steering brake valve is characterized in that: It also includes a reversing valve B, a third electromagnetic proportional valve, and a fourth electromagnetic proportional valve. The oil inlets of the third electromagnetic proportional valve and the fourth electromagnetic proportional valve are both connected to the main oil circuit. The oil outlet of the third electromagnetic proportional valve is connected to the inlet of the one-way valve C through the fifth one-way oil circuit. The outlet of the one-way valve C is connected to the third actuator through the sixth one-way oil circuit. The oil outlet of the fourth electromagnetic proportional valve is connected to the inlet of the one-way valve D through the seventh one-way oil circuit. The outlet of the one-way valve D is connected to the fourth actuator through the eighth one-way oil circuit.

3. The new steering brake valve according to claim 2 is characterized in that: The reversing valve B is a two-position four-way hydraulic reversing valve, the P port of the reversing valve B is connected to the main oil circuit via a second connecting oil circuit, an overflow valve B is installed on the second connecting oil circuit, the T port of the reversing valve B is connected to the oil tank, the A port of the reversing valve B is connected to the sixth one-way oil circuit, the B port of the reversing valve B is connected to the eighth one-way oil circuit, the first control port of the reversing valve B is connected to the fifth one-way oil circuit, and the second control port of the reversing valve B is connected to the fifth one-way oil circuit.

4. The new steering brake valve according to claim 3 is characterized in that: The first actuator (5) and the second actuator (8) are respectively a left steering clutch oil cylinder and a right steering clutch oil cylinder.

5. The new steering brake valve according to claim 4 is characterized in that: The third actuator and the fourth actuator are respectively a left brake clutch oil cylinder and a right brake clutch oil cylinder.

6. The new steering brake valve according to claim 5 is characterized in that: The first solenoid proportional valve (1), the second solenoid proportional valve (6), the third solenoid proportional valve, the fourth solenoid proportional valve, the reversing valve A (2), the reversing valve B, the overflow valve A (3), the overflow valve B, the check valve A (4), the check valve B (7), the check valve C, and the check valve D are all integrated on the same valve body.

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