Fuel-cut cylinder of engine

Abstract

A fuel-cut cylinder of an engine structurally comprises a front end cap, a rear end cap and a cylinder barrel. A piston rod assembly, a front spring seat, an intermediate spring seat and a return spring are arranged in the cylinder barrel; a felt gas filtering pad and a retainer ring are arranged in the front end cap; a through hole is arranged on the top of the front end cap; a rectangular sealing gasket is arranged in the rear end cap; a U-shaped ring is arranged on the piston rod assembly, and a stainless steel V-shaped spring is arranged in the U-shaped ring; and the return spring is of a waist-drum-shaped structure. The polytetrafluoroethylene U-shaped ring is used as a sealing piece, requirements of the cylinder when the cylinder works under working conditions of high temperature, poor lubrication and the like can be met, the return spring of the cylinder is of the waist-drum-shaped structure, so that the problem that the wall of the cylinder barrel is scratched due to sideward bending of the spring is avoided effectively, and solid particles are prevented from entering the cylinder barrel during breathing of the cylinder by the aid of the felt gas filtering pad of the front end cap. The fuel-cut cylinder has the advantages of stable performance, reasonable design, reliability in work and long service life.

Description

technical field [0001] The invention relates to an engine oil stop cylinder for heavy-duty vehicles, in particular to a single-acting control cylinder. Background technique [0002] At present, most of the heavy trucks, large and medium-sized passenger cars use the oil stop cylinder to cut off the oil circuit. This product is installed and used close to the engine and has a high working temperature. At present, the selection of sealing materials and product structures of conventional products on the market are difficult to meet high temperature conditions. The demand is mainly manifested in: 1. The grease is not resistant to high temperature, and the wear of the seal is accelerated after curing; 2. The spring is not stable enough. When the oil cylinder is stopped, the spring side bends, scratches and pulls the cylinder wall, and finally causes the cylinder to be damaged. The failure of the seal reduces the service life of the oil-stopped cylinder. In recent years, many oil-s...

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Problems solved by technology

[0002] At present, most of the heavy-duty trucks, large and medium-sized buses use oil-stop cylinders to cut off the oil circuit. This product is installed and used next to the engine, and the working temperature is high. The selection of sealing materials and product structure of conventional products on the market are difficult to meet high-temperature conditions. The demand is mainly manifested in: 1. The grease is not resistant to high temperature, and the wear of the seal will be accelerated after curing; 2. The spring is not stable enough. When the oil-stop cylinder is working, the spring bends sideways, scratches and strains the cylinder wall, and eventually causes the cylinder The seal fails, which reduces the service life of the oil-stop cylinder. In recent years, many manufacturers of oil-stop cylinders have made structural improvements, but the results are not satisfactory.

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