Piston sealing part capable of reducing damping force and oil cylinder piston

Abstract

The invention discloses a piston sealing part capable of reducing the damping force and an oil cylinder piston. The piston sealing part capable of reducing the damping force comprises a composite engineering plastic piston ring, an O-shaped ring, a first nylon check ring and a second nylon check ring, wherein the composite engineering plastic piston ring is arranged on the outer wall of the O-shaped ring, the outer wall of the first nylon check ring and the outer wall of the second nylon check ring in a sleeving mode, the first nylon check ring and the second nylon check ring are located at the two axial ends of the composite engineering plastic piston ring, and the O-shaped ring is located between the first nylon check ring and the second nylon check ring. The oil cylinder piston comprises the sealing part, a piston body and a piston sleeve. According to the piston sealing part capable of reducing the damping force, the piston sealing part is simple and reasonable in structure, easy to produce, stable in performance, long in service life, low in cost and suitable for large-scale industrial production; and through the oil cylinder piston, a hydraulic cylinder for overturning a cabdoes not generate extra negative damping force on a spring suspended on the truck cab, and the problem that the composite engineering plastic piston ring breaks and loses efficacy can be thoroughly solved.

Description

technical field [0001] The invention belongs to the field of hydraulic systems, and relates to a piston seal suitable for reducing the damping force in an overturning system of a truck cab, but is not limited to the application of the overturning system of a truck cab. The invention also relates to a cylinder piston with such a seal. Background technique [0002] The hydraulic cylinder is the power actuator of the heavy-duty truck cab tilt hydraulic system, which is used to flip the truck cab and then repair the internal combustion engine installed under it. The upper end of the hydraulic cylinder is connected to the cab and the lower end is connected to the chassis of the truck. During the driving process of the truck, the cab will vibrate up and down on the spring suspension of the chassis with the bumps of the driving road, thereby driving the piston rod of the oil cylinder to vibrate, and then making the piston of the oil cylinder in the cylinder barrel. In order to ena...

AI Technical Summary

Problems solved by technology

For many years, the composite engineering plastic piston ring on the piston has adopted a rectangular cross-section ring belt, which is directly assembled into the rectangular groove of the piston, and the composite engineering plastic piston ring has a certain The force of outward expansion, under the action of this force, is tightly pressed against the inner wall of the cylinder to achieve the sealing effect, but if the cylinder has a cross-sectional deformation, the direction of the outer diameter of the composite engineering plastic piston ring will become larger with the shape of the cross-section

This enlargement will produce two kinds of disadvantages. One is that when the piston is in the square deformation zone of the cylinder, this enlargement will compress the space at the four corners of the cylinder cylinder, thereby reducing the gap for oil flow and increasing the negative damping force of the cylinder. The second is that when the piston passes through the transition zone between the square deformation zone and the non-deformation zone of the cylinder when the cylinder is pulled back, the hydraulic pressure will generate shear force on the composite engineering plastic piston ring at the four corners of the cylinder square deformation zone so that the compound Shear Fracture of Engineering Plastic Piston Ring

Images