CN102269271A

CN102269271A - Sealing structure of hydraulic cylinder

Info

Publication number: CN102269271A
Application number: CN2010102021470A
Authority: CN
Inventors: 乔言海
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-06-03
Filing date: 2010-06-03
Publication date: 2011-12-07

Abstract

The invention relates to a sealing structure of a hydraulic cylinder. In the structure, n-shaped sealing rings at the two ends of a piston are made into n shapes; the two ends of the piston are arranged on oil distributing rings with the same shape as the inner cavities of the n-shaped sealing rings; holes are formed in the oil distributing rings in the radial direction; during installation, the holes in the oil distributing rings are communicated with working cavities on the two sides of the piston through communicating holes on the piston; the n-shaped sealing rings are arranged on the oil distributing ring through the inner cavities of the n-shaped sealing rings; a check ring of which the excircle size is the same as the internal diameter of the hydraulic cylinder is arranged on the piston of which the two sides are provided with the n-shaped sealing rings; a floating piston of which the diameter is smaller than that of the check ring is arranged on the piston on the outer side of the check ring; the floating piston is axially positioned on the piston through a spring check ring; a guide ring is arranged in a groove in the middle of the piston; and the piston and other parts are arranged in a cylinder body.

Description

A kind of sealing configuration of oil hydraulic cylinder

Technical field

The present invention relates to the sealing configuration of a kind of sealing configuration, particularly a kind of oil hydraulic cylinder, belong to hydraulic transmission technology field.

Background technique

At present, in hydraulic transmission technology field, as the oil hydraulic cylinder of Hydraulic Power Transmission System vitals, its sealing configuration mainly adopts two kinds of methods, and a kind of is to adopt the lip seal coil structures, is the form of main structure; Another is to adopt combined seal ring or compound lip-type packing as the sealing configuration form, and in the use of reality, all there is different scarce limits in this sealing configuration form of two kinds.

At first, adopt the form of lip-type packing as main sealing configuration, though have the advantage that assembling is simple, price is lower,, owing to structure and the reason above the material, Sealing slide relative face trace performance is relatively poor, especially in the frequent commutation of oil hydraulic cylinder,, cause Sealing easily because of fatigue damage because the lip face of Sealing bears periodic height pressure, and then cause leakage, oil hydraulic cylinder can not normally be worked.

And the sealing configuration form of employing combined seal ring or compound lip-type packing, though can avoid sealing configuration to be easy to damage effectively, the scarce limit that life-span is lower, but, because the length of its installation is bigger, Costco Wholesale height not only, simultaneously, because there is bigger surface friction drag, so, there is the higher defective of consumed energy.

Summary of the invention

The objective of the invention is to: a kind of good seal performance is provided, has again higher working life simultaneously; The hydraulic cylinder sealing mechanism that energy consumption is less overcomes the above-mentioned defective that existing hydraulic cylinder sealing coil structures exists owing to structural reason.

The present invention realizes that the technological scheme that above-mentioned purpose adopts is: a kind of sealing configuration of oil hydraulic cylinder, it is the shape that is manufactured the n type by the n RunddichtringO at piston two ends, the piston two ends are installed above the oil distributing ring identical with n RunddichtringO cavity shape, radial direction perforate at oil distributing ring, when mounted, hole on the oil distributing ring communicates with the active chamber on piston both sides respectively by the intercommunicating pore on the piston, with the n RunddichtringO by its inner chamber be installed in oil distributing ring above, the excircle dimension back-up ring identical with the oil hydraulic cylinder internal diameter is installed on the piston of the seal ring both sides of n type, the floating piston of diameter less than the back-up ring diameter is installed on the piston in the back-up ring outside, floating piston is by check ring axially locating on piston, guide ring is installed in the groove at piston middle part, piston and other parts is installed to the inside of cylinder body.

Working principle of the present invention is: when the A chamber of oil hydraulic cylinder feeds pressure oil, the B chamber is in the state of pressure release, so pressure oil at first is carried in above the floating piston in A chamber, and the side by back-up ring compression n RunddichtringO, thereby the n RunddichtringO is expanded in diametric(al), simultaneously, the pod apertures of pressure oil piston left end and the radial direction through hole of oil distributing ring enter in the inner chamber of n RunddichtringO, the seal ring of n type is expanded further in diametric(al) comprehensively, thereby realize the effect of sealing, at this moment, in the B chamber because no pressure, seal ring is in contraction state, so, between n RunddichtringO in this moment B chamber and the cylinder body owing to there is not or exists less frictional force, thereby, consumed energy hardly, and in the B chamber, feeding pressure oil, when being in the pressure release state in the A chamber, the working condition in two chambeies is just in time opposite.

Beneficial effect: the sealing configuration of a kind of oil hydraulic cylinder of the present invention, owing to adopted the structural type of n RunddichtringO that cylinder body is sealed, the n RunddichtringO is done expansion radially under corresponding pressure, so, have favorable sealing property, have again higher working life simultaneously; The advantage that energy consumption is less.

Description of drawings

Fig. 1 is a structure principle chart of the present invention.

Shown in the figure: 1, cylinder body; 2, check ring; 3, floating piston; 4, back-up ring; 5, n RunddichtringO; 6, oil distributing ring; 7, guide ring; 8, piston.

Embodiment

The n RunddichtringO (5) at piston (8) two ends is manufactured the shape of n type, piston (8) two ends are installed above the oil distributing ring (6) identical with n RunddichtringO (5) cavity shape, radial direction perforate at oil distributing ring (6), when mounted, hole on the oil distributing ring (6) communicates with the active chamber on piston both sides respectively by the intercommunicating pore on the piston (8), with n RunddichtringO (5) by its inner chamber be installed in oil distributing ring (6) above, the excircle dimension back-up ring (4) identical with the oil hydraulic cylinder internal diameter is installed on the piston of seal ring (5) both sides of n type, the floating piston (3) of diameter less than back-up ring (4) diameter is installed on the piston (8) in back-up ring (4) outside, floating piston (3) is by check ring (2) axially locating on piston (8), guide ring (7) is installed in the groove at piston (8) middle part, piston (8) and other parts is installed to the inside of cylinder body (1).

Claims

1. the sealing configuration of an oil hydraulic cylinder, it is made up of cylinder body (1), check ring (2), floating piston (3), back-up ring (4), n RunddichtringO (5), oil distributing ring (6), guide ring (7), piston (8), and it is characterized in that: the n RunddichtringO (5) at piston (8) two ends manufactures the shape of n type.

2. according to the sealing configuration of claims 1 described a kind of oil hydraulic cylinder, it is characterized in that: the radial direction perforate of oil distributing ring (6).

3. according to the sealing configuration of claims 2 described a kind of oil hydraulic cylinders, it is characterized in that: n RunddichtringO (5) by its inner chamber be installed in oil distributing ring (6) above.