Air pump of engineering machinery braking system

Abstract

The invention discloses an air pump of an engineering machinery braking system. The air pump comprises a cylinder casing, a cylinder piston, a push rod, a connection cover, a valve assembly, a hydraulic piston assembly and a hydraulic cylinder body. The cylinder casing and the connection cover form a cylinder assembly. The hydraulic piston assembly is arranged in the hydraulic cylinder body. The cylinder piston is arranged in an inner cavity of the cylinder assembly, one end of the push rod is connected with the cylinder piston in a fastening mode, and the other end of the push rod penetrates a center hole of the connection cover to be connected with the hydraulic piston assembly. The connection cover and the push rod are sealed through a Y-shaped sealing ring and a dustproof ring. By means of the technical scheme, the sealing mode between the connection cover and the push rod is changed, sealing is conducted through the Y-shaped ring, the guide sleeve and the dustproof ring, the guide sleeve is added to support the push rod, eccentric abrasion of a piston leather ring and the Y-shaped ring is reduced, and product reliability is improved. Connection of the hydraulic piston and the push rod is changed to be cylindrical pin connection, connection reliability is improved, and the service life of products is prolonged.

Description

technical field [0001] The invention belongs to the technical field of construction machinery brake systems. Specifically, the present invention relates to an air booster pump of an engineering machinery braking system. Background technique [0002] Such as figure 1 As shown, in the prior art, the seal between the air booster pump connecting cover and the push rod used in the braking system of engineering machinery adopts a combination of a central seal ring and an O-ring seal, and the sealing teeth of the central seal ring It is easy to be worn, resulting in oil leakage of the product; the push rod and the hydraulic piston are connected by a retaining ring through the hole, and the retaining ring is easy to fall off, resulting in product failure; the push rod seat assembly is positively sealed, and the high-pressure oil impacts the rubber instantly when the product returns, causing its aging , damage, causing brake failure. Contents of the invention [0003] The invent...

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Problems solved by technology

[0002] like figure 1 As shown, in the prior art, the seal between the air booster pump connecting cover and the push rod used in the braking system of engineering machinery adopts a combination of a central seal ring and an O-ring seal, and the seal teeth of the central seal ring It is easy to be worn, resulting in oil leakage of the product; the push rod and the hydraulic piston are connected by a retaining ring through the hole, and the retaining ring is easy to fall off, resulting in product failure; the push rod seat assembly is positively sealed, and the high-pressure oil impacts the rubber instantly when the product returns, causing its aging , damage, causing brake failure

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