Electro-hydraulic hybrid brake valve of forklift

Abstract

The utility model belongs to the technical field of vehicle braking, and particularly relates to an electro-hydraulic hybrid brake valve of a forklift. The brake valve integrates a servo electric cylinder and a hydraulic transmission technology. The main structure comprises a connecting sleeve and a valve body which are communicated with each other, and a piston rod of the servo electric cylinder extends into the connecting sleeve. A force transmission piston and a brake piston are arranged in the valve body, the force transmission piston is connected with a servo electric cylinder piston rod through a brake valve piston rod, and a force sensor is arranged between the force transmission piston and the servo electric cylinder piston rod to achieve accurate force monitoring and control. A spring is installed between the brake piston and the force transmission piston and used for providing reset force. An oil port is formed in the valve body end cover, and an oil return port and an oil inlet are formed in the radial direction so that circulation and control of hydraulic oil can be achieved. Through accurate control of the servo electric cylinder and combination of high efficiency of hydraulic transmission, accurate adjustment and quick response of the forklift braking force are achieved, and the braking performance and safety of the forklift are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to a kind of vehicle braking technical field, specifically a kind of forklift electro-hydraulic hybrid brake valve. BACKGROUND

[0002] 202322929561.7 a kind of forklift brake valve, 200820166180.0 pedal type forklift brake valve etc., respectively disclosed forklift brake valve technology, wherein brake valve is respectively provided with brake oil port, oil return tank port and oil supply port on the side wall of cylinder body, main oil cylinder cavity, oil return cavity and power cavity are arranged in the cylinder body, main oil cylinder cavity, oil return cavity and power cavity are respectively slidably installed with main piston, oil return cavity piston and power cavity piston etc., complex structure, many parts, pressure is influenced by multiple valve ports and spring parameters, valve performance control point is more;Hydraulic brake valve power ratio and force characteristic curve are determined by mechanical structure, not adjustable, poor adaptability;

[0003] Secondly, common hydraulic brake valve relies on foot pedal to exert force on valve core handle, and is mechanical structure, to realize unmanned driving etc., need to increase the motor conversion structure of load, and existing technology cannot adapt to the requirements of unmanned brake valve. INVENTION CONTENTS

[0004] The utility model provides a kind of forklift electro-hydraulic hybrid brake valve, with Simple structure, easy operation, control precision is high The characteristics of.

[0005] The utility model technical scheme is as follows:

[0006] A kind of forklift electro-hydraulic hybrid brake valve, including servo cylinder (1), it is characterized in that, including the connection sleeve (3) and valve body (7) being connected with each other, the connection sleeve (3) and valve body (7) are communicated with each other, servo cylinder piston rod (2) is inserted into connection sleeve (3);Valve body (7) is equipped with force transmission piston (11), force transmission piston (11) is connected with brake valve piston rod (12), and servo cylinder piston rod (2) is connected between brake valve piston rod (12) by force sensor (4);Valve body (7) is also equipped with brake piston (9), and spring (10) is installed between brake piston (9) and force transmission piston (11), and oil port (Br) is equipped on the end cover (8) of valve body (7), and return port (T) and inlet (P) are opened in the radial direction of valve body (7).

[0007] The middle of the connection sleeve (3) is equipped with aperture, which is the cable outlet hole of force sensor (4).

[0008] In the case that spring (10) is not telescopic, return port (T) and inlet (P) are respectively located on the valve body (7) on the two sides of brake piston (9).

[0009] The force transmission piston (11) and the brake piston (9) are respectively sleeved with sealing rings (6).

[0010] The connecting sleeve (3) and the valve body (7) are fixed by flange connection.

[0011] The valve body (7) is coaxially installed with the force transmission piston (11), the spring (10), and the brake piston (9).

[0012] The spring (10) plays a buffering and resetting role, and when the servo cylinder (2) is not working, it can make the brake piston (9) and the force transmission piston (11) return to the initial position.

[0013] The end cover (8) of the valve body (7) is provided with an oil port (Br) for connecting with the oil circuit of the brake system. At the same time, the valve body (7) is provided with a radial direction oil return port (T) and an oil inlet port (P) for the return and supply of hydraulic oil, respectively.

[0014] Through real-time monitoring and feedback of the force sensor (4), the size of the thrust generated by the servo cylinder (2) can be accurately controlled, thereby realizing accurate control of the braking force.

[0015] When working, the brake valve P port is connected to the pump source, the T port is connected to the oil tank, and the Br port is connected to the brake. The brake valve is driven by the servo cylinder piston rod to drive the hydraulic valve piston, pressurizing the oil in the brake chamber to provide braking pressure for the brake.

[0016] The brake valve uses a servo cylinder as the power source, and through an electronic control system, it can achieve precise control of the braking force. This precise control helps to improve the braking performance and safety of the forklift, especially in situations that require fast response and precise braking.

[0017] The servo cylinder has the characteristic of fast response speed, so the brake valve can generate the required braking force in a short time. This is crucial for improving the operating efficiency and safety of the forklift, especially in emergency braking situations.

[0018] Compared with traditional hydraulic brake systems, the electro-hydraulic hybrid brake valve can more effectively utilize energy during braking. By precisely controlling the output power of the servo cylinder, unnecessary energy consumption can be reduced, thereby reducing the operating cost of the forklift.

[0019] The design of the brake valve has great flexibility, which can adapt to different forklift models and braking requirements. By adjusting the parameters of the servo cylinder and the structure of the brake valve, it can meet the braking requirements in various working conditions.

[0020] Maintenance is convenient:

[0021] The structure of the electro-hydraulic hybrid brake valve is relatively simple, easy to maintain and replace parts. This helps to reduce the maintenance cost of the forklift, improve the reliability and service life of the equipment.

[0022] The brake valve integrates electronic control and hydraulic transmission technologies, achieving high integration of the brake system. This helps to reduce system complexity, improve system stability and reliability.

[0023] Environmentally friendly and energy saving:

[0024] In summary, an electro-hydraulic hybrid brake valve for a forklift has the technical advantages of precise control, rapid response, low energy consumption, strong adaptability, easy maintenance, high integration and environmental protection and energy saving. These advantages make the brake valve have wide application prospect and important technical value in the brake system of the forklift. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The utility model discloses a structure schematic diagram.

[0026] Marked number in the drawing: 1 - servo electric cylinder;2 - servo electric cylinder piston rod;3 - connecting sleeve;4 - force sensor;5 - valve body left flange, 6 - sealing ring, 7 - valve body, 8 - end cover, 9 - brake piston, 10 - spring, 11 - force transmission piston, 12 - brake valve piston rod. DETAILED DESCRIPTION

[0027] An electro-hydraulic hybrid brake valve for a forklift includes a servo electric cylinder 1, a connecting sleeve 3 and a valve body 7 connected to each other, the connecting sleeve 3 and the valve body 7 are in communication with each other, the servo electric cylinder piston rod 2 extends into the connecting sleeve 3;The valve body 7 is provided with a force transmission piston 11, the force transmission piston 11 is connected with a brake valve piston rod 12, the servo electric cylinder piston rod 2 and the brake valve piston rod 12 are connected through a force sensor 4;The valve body 7 is also provided with a brake piston 9, the brake piston 9 and the force transmission piston 11 are provided with a spring 10, the end cover 8 of the valve body 7 is provided with an oil port Br, the valve body 7 is provided with a return oil port T and an oil inlet P in the radial direction.

[0028] The right end of the servo electric cylinder piston rod 2 is threadedly connected with the left side of the force sensor 4, the right side of the force sensor 4 is threadedly connected with the left end of the brake valve piston rod 12, the right end of the brake valve piston rod 12 is threadedly connected or welded with the force transmission piston 11, the right end of the force transmission piston 11 is in contact with the left end of the spring 10, the right end of the spring 10 is in contact with the left end of the brake piston 9. The valve body 7, the force transmission piston 11, the spring 10 and the brake piston 9 are coaxially installed, the valve body left flange 5 is bolted with the left end surface of the valve body 7, and the right end cover 8 is bolted with the right end surface of the valve body 7. The left end of the connecting sleeve 3 is bolted with the servo electric cylinder, and the right end of the connecting sleeve 3 is bolted with the valve body left flange 5.

[0029] The radial hole a in the middle of the connecting sleeve 3 is the cable hole of the force sensor 4, the valve body 7 has the return oil port T and the inlet oil port P in the radial direction, and the right end cover 8 has the oil port Br.

[0030] In operation, the return oil port T is connected to the oil tank, the inlet oil port P is connected to the pump source, and the oil port Br is connected to the brake valve.

[0031] In the initial state, the pump source supplies oil to the brake chamber through the inlet oil port P. In operation, the servo cylinder piston rod 2 extends and pushes the brake valve piston rod 12 and the force transmission piston 11 to move to the right. The force is transmitted to the brake piston 9 through the spring 10. The oil in the brake chamber is compressed and pressurized. When the force of the oil pressure in the brake chamber and the spring force of the spring 10 are balanced, the brake piston 9 stops moving and the pressure stabilizes. The hydraulic oil that leaks from the brake chamber to the spring chamber flows back to the oil tank through the return oil port T. When the output force of the servo cylinder 1 decreases, the force transmitted to the brake piston 9 through the spring 10 decreases, the pressure in the brake chamber decreases, and when the oil pressure and the spring force are balanced, the pressure no longer decreases.

[0032] The force sensor 4 measures the actual output force of the servo cylinder, forms a force closed loop, and accurately controls the output force of the servo cylinder, thereby accurately controlling the pressure in the brake chamber.

Claims

1. A forklift electro-hydraulic hybrid brake valve comprising a servo cylinder (1), characterized in that, The utility model relates to a brake valve, including mutually connected connecting sleeve (3) and valve body (7), connecting sleeve (3) and valve body (7) intercommunication, servo cylinder piston rod (2) extends into connecting sleeve (3) inside, be equipped with force transmission piston (11) in valve body (7), force transmission piston (11) is connected with brake valve piston rod (12), and servo cylinder piston rod (2) and brake valve piston rod (12) are connected through force sensor (4) between, still be equipped with brake piston (9) in valve body (7), spring (10) is installed between brake piston (9) and force transmission piston (11), and the end cover (8) of valve body (7) is equipped with oil port (Br), and valve body (7) radial direction is opened and is equipped with oil return port (T) and oil inlet (P).

2. The electro-hydraulic hybrid brake valve of claim 1, wherein, The connecting sleeve (3) is provided with an opening in the middle, which is a cable outlet hole of the force sensor (4).

3. The electro-hydraulic hybrid brake valve of claim 1, wherein, When the spring (10) is not stretched or contracted, the oil return port (T) and the oil inlet (P) are respectively located on the valve body (7) on both sides of the brake piston (9).

4. The electro-hydraulic hybrid brake valve of claim 1, wherein, The force transmission piston (11) and the brake piston (9) are respectively sleeved with a sealing ring (6).

5. The electro-hydraulic hybrid brake valve of claim 1, wherein, The connecting sleeve (3) and the valve body (7) are fixedly connected through a flange.

6. The electro-hydraulic hybrid brake valve of claim 1, wherein, The valve body (7), the force transmission piston (11), the spring (10), and the brake piston (9) are coaxially installed.

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