Improved structure for leakage of gear selection and engagement actuator

Abstract

The invention discloses an improved structure for leakage of a gear selection and engagement actuator. The improved structure comprises a gear selection and engagement actuator valve and a gear engagement piston. A containing cavity is formed in the gear selection and engagement actuator valve, and an oil way is formed in the gear selection and engagement actuator valve. The gear engagement pistonis movably arranged in the containing cavity, a lip sealing ring and an O-shaped sealing ring are arranged between each of the two ends of the gear engagement piston and the gear selection and engagement actuator valve correspondingly, two grooves are formed between the gear engagement piston and the gear selection and engagement actuator valve, each of the two grooves is located between the corresponding lip sealing ring and O-shaped sealing ring at the same end of the gear engagement piston, and the two grooves communicate with the oil way. By means of the improved structure, leaked hydraulic oil can be recycled into an oil pot, and therefore the hydraulic oil cannot flow outwards.

Description

technical field [0001] The invention relates to the technical field of hydraulic systems, in particular to an improved structure for leakage of a gear selection actuator. Background technique [0002] The gear selection actuator is a part applied to the hydraulic actuator with automatic manual function to realize the gear selection and gear engagement functions of the whole vehicle; it is mainly composed of the actuator, the gear selection piston and the seal; among them, during the gear engagement process , the gear-engaging piston in the actuator valve body will move back and forth under the action of hydraulic pressure to realize the action of shifting gears on one side for odd-numbered gears and the other side for even-numbered gears. [0003] figure 1 For a schematic diagram of the overall structure of a traditional gear selection actuator, please refer to figure 1 As shown, in the prior art, a hydraulic oil chamber 13 is formed in the actuator valve body 11, and a li...

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Problems solved by technology

[0003] figure 1 For a schematic diagram of the overall structure of a traditional gear selection actuator, please refer to figure 1 As shown, in the prior art, a hydraulic oil chamber 13 is formed in the actuator valve body 11, and a lip seal 14 is sandwiched between the two ends of the shifting piston 12 and the wall of the hydraulic oil chamber 13 respectively. During the durability process, according to the principle of dynamic sealing, when the shifting piston 12 moves back and forth in the actuator valve body 11 under the action of hydraulic pressure, the hydraulic oil will flow between the lip of the lip seal ring 14 and the inner cavity of the actuator valve body 11. An oil film is formed between the chamber walls, and the oil film on the edge of the lip seal ring 14 seeps out due to the pressure difference. After a long period of time, a certain volume of hydraulic oil leakage will appear outside the valve body 11 of the gear selection actuator, especially in the In the application environment of trucks, the number of durability is twice that of passenger cars, and the amount of leakage increases accordingly

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