Automobile rear axle gas vent valve

Abstract

The invention discloses an automobile rear axle gas vent valve comprising an installing seat installed on a rear axle shell, a valve body fixed to the installing seat, a dust prevention cap fixed to the top end of the valve body, a valve core, an upper valve plate and a pre-tightening spring. A vent hole is formed in the valve body axially. The bottom of the dust prevention cap is provided with a gas outlet. The valve core is arranged in the vent hole. A cavity between the valve core and the vent hole is an oil and gas separation cavity. A gas inlet cavity is formed in the valve core. The bottom of the gas inlet cavity communicates with the rear axle shell. The side wall of the gas inlet cavity is provided with a plurality of gas outlet holes communicating with an oil and gas separation chamber. The upper valve plate is installed at the top end of the valve core and used for opening or closing the oil and gas separation cavity. The oil and gas separation cavity is connected with an exhaust opening after opened. The pre-tightening spring is arranged between a valve cover and the upper valve plate and is used for controlling the opening pressure of the upper valve plate. A high-pressure oil and gas mixture flows out of the gas inlet cavity through the gas outlet holes and impacts on the side wall of the vent hole, and thus oil and gas are separated. According to the scheme, the oil and gas separation cavity is formed in the valve body, so that after mixed gas impacts on the side wall of the oil and gas separation cavity, oil and gas separation is achieved.

Description

technical field [0001] The invention relates to the field of automobile rear axle accessories, in particular to an automobile rear axle ventilation valve. Background technique [0002] In order to prevent the external muddy water and dust from splashing into the inside of the axle housing, the rear axle of the car will cause early wear of the gears, and prevent the internal pressure of the axle housing from increasing as the internal oil temperature rises, causing oil leakage at the half shaft oil seal and the main shaft oil seal. Or install a breather valve on the final drive housing. At present, most of the rear axle ventilation valves are of one-way valve structure, and the upper hole wall of the ventilation hole is provided with a normally closed valve connecting the inside of the axle housing with the outside atmosphere, and is fixed to the fixing seat on the axle housing through the thread at the lower part. . The vent plug has a relatively simple structure, which ca...

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Problems solved by technology

[0005] The present invention solves the problem that the existing vent valve cannot realize the separation of oil and gas, causing the oil in the oil-gas mixture to condense at the oil outlet of the vent valve, resulting in oil exposure

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