Main and secondary double-valve element type single H gas valve

Abstract

The invention discloses a main and secondary double-valve element type single H gas valve. The main and secondary double-valve element type single H gas valve comprises a valve body; a main valve element and a secondary valve element capable of both axially moving are arranged in the valve body; when the secondary valve element moves to the connected place of the back end surface with the back end of the valve body, a bolt penetrates through a bolt hole to enter a first bolt hole to lock the secondary valve element; and when the main valve element moves to the connected place of the front end surface with the front end of the valve body, the bolt penetrates through the bolt hole to enter a second bolt hole to lock the secondary valve element. The main and secondary double-valve element type single H gas valve adds one secondary element to contact with the bolt; but the main valve element is not contacted with the bolt. As the stop design of the main and secondary double valve elements is adopted, the main valve element of the single H gas valve cannot be bent by suffering from radial force of the bolt to cause bad single-edge wear of a sealing ring. The secondary valve element only needs to satisfy the bolt contact function to finish the locking function; and the bending deformation and the wear of the secondary valve element cannot influence the reversing and sealing functions of the main valve element.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of transmissions, and relates to a single H air valve, in particular to a main and auxiliary double spool type single H air valve. [0003] 【Background technique】 [0004] The single H air circuit is used in the main and auxiliary gearboxes to realize the driver's selection of high and low gears for the auxiliary gearbox. The single-H air valve is the core component of the single-H air circuit, and its design directly affects the structure, cost, and performance of the entire air circuit. At present, there are two types of single-H air circuits commonly used, and correspondingly, there are two types of single-H air valves, one with stop function and one without stop function. [0005] The single H valve without stop function is a reversing valve with one inlet, two outlets and one control port, and it needs to be used together with a stop valve. However, at the working time of the spool of this str...

AI Technical Summary

Problems solved by technology

[0007] The original single H valve with stop function, because the pin is in direct contact with the valve core, when the pin exerts force on the valve core, the inlet end of the valve core will always be subjected to a radial force, and when the air inlet or the control When gas enters the port, the axial force on the valve core under the action of air pressure will aggravate the influence of the pin on the radial force of the valve core, so the valve core will be distorted and deformed, which will increase the wear of the sealing ring on the valve core , and then in the long-term use process, the seal will fail, and its reliability and life will be greatly reduced

At the same time, the pin will also be bent due to the axial force on the valve core. Under extreme conditions, the pin cannot enter the first or second slot on the valve body, and the valve will be stuck.

[0008] However, due to the "pin" mechanical structure adopted by the currently used single H air valve with stop function, one end of the valve core will always be subjected to the radial force given by the pin, and the valve core will be bent due to bending during long-term movement. Deformation occurs due to torque, resulting in serious wear on one side of the sealing ring on the valve core, resulting in seal failure, and its reliability and life will be greatly reduced

[0009] To sum up, the existing single-H gas circuit scheme has its own advantages and disadvantages. Although it has been matured after years of continuous improvement, it is still not the optimal scheme. The single H air valve, which will reduce the reliability and life of the valve core due to deformation during use, satisfies the function realization of the single H valve

Images