CN1325824C

CN1325824C - Reciprocating hydraulic piston mechanism

Info

Publication number: CN1325824C
Application number: CNB2004100064387A
Authority: CN
Inventors: 鲁晓兵; 王淑云; 时钟民; 赵京; 王爱兰
Original assignee: Institute of Mechanics of CAS
Current assignee: Institute of Mechanics of CAS
Priority date: 2004-03-08
Filing date: 2004-03-08
Publication date: 2007-07-11
Anticipated expiration: 2024-03-08
Also published as: CN1560495A

Abstract

The present invention discloses a reciprocating type hydraulic piston mechanism which comprises a sleeve barrel, a piston and a piston rod, wherein the piston rod and the piston are fixed; the piston is directly matched with the inner wall of the sleeve barrel through the external surface. A plurality of annular grooves are machined on the external surface of the piston at the interval of proper distance. A matching surface between two annular grooves is matched with the inner wall of the sleeve barrel. A gap of 2 to 3 micrometers is arranged between the matching surface and the inner wall of the sleeve barrel. After the gas between the working surface of the external surface of the piston and the inner wall of the sleeve barrel is controlled between 2 and 3 micrometers, the present invention performs effective oil sealing function under the condition of high frequency reciprocating motion of the piston. The grooves which are arranged on the external surface of the piston not only can store certain oil for the lubrication between the working surface of the piston and the inner wall of the sleeve barrel, but also can perform good buffer function for the leakage generated by the gap between the piston and the sleeve barrel, and thus, the oil sealing effect of the piston is further enhanced.

Description

A kind of reciprocating hydraulic piston mechanism

Technical field

The present invention relates to a kind of piston mechanism, relate in particular to a kind of reciprocating hydraulic piston mechanism.

Background technique

The seal ring sealing of making by rubber material usually between the sleeve of existing hydraulic piston mechanism and the piston, under the very little situation of reciprocating motion of the pistons frequency, seal ring can satisfy normal seal request, and when piston is reciprocating with very high frequency, seal ring then because of and sleeve lining between friction aging rapidly, thereby be difficult to satisfy usage requirement.

Summary of the invention

Deficiency at prior art exists the object of the present invention is to provide a kind of stable performance, need not to install seal ring, is applicable to that piston does the reciprocating hydraulic piston of high frequency mechanism.

For achieving the above object, reciprocating hydraulic piston mechanism of the present invention comprises sleeve, piston and piston rod, piston rod and piston fix, piston directly matches with sleeve lining by its outer surface, suitable at interval distance is processed with some roads annular groove on the outer surface of piston, be the fitting surface that matches with sleeve lining between the annular groove in twos, leave the gap of 2 μ between this fitting surface and the sleeve lining.

Further, the section of the annular groove on the described outer surface of piston is a circular arc.

With the working surface on the outer surface of piston and the gap control between the sleeve lining behind 2 μ, can under the reciprocating situation of piston high frequency, play effective oil sealing effect, the groove of outer surface of piston setting not only can be laid in certain oil and be used for lubricating between working surface of piston and the sleeve lining, and this groove can play good buffer function to the leakage that produces along the gap between piston and the sleeve, thereby further improves the oil sealing effect of piston.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is an A portion enlarged view among Fig. 1.

Embodiment

As Fig. 1; shown in Figure 2; piston 3 places in the sleeve 1; piston rod 2 is arranged on an end of piston 3; piston 3 directly matches with sleeve lining by its outer surface; suitable at interval distance is processed with some roads annular groove 4 on piston 3 outer surfaces; be the fitting surface 5 that matches with sleeve lining in twos between the annular groove; leave the gap of 2 μ between this fitting surface 5 and the sleeve lining; guarantee that piston 3 can be free to slide in sleeve 1; when piston 3 motions; oil in the one end active chamber can enter into piston groove through the gap between piston 3 and the sleeve 1; because piston is reciprocating with very high motion frequency; so before oil fills up piston groove one by one; be before the two ends oil pocket is communicated with; piston just begins motion in the other direction; play good oil sealing effect; dredge oil amount in the piston groove can be ignored; piston motion can with the control command precise synchronization; can not produce retardation phenomenon; oil in the piston groove can play good lubrication simultaneously; piston groove also can reduce friction in the confining force balance, also can not rest on for a long time in the piston if any foreign material, guarantees stable work in work.

Claims

1. reciprocating hydraulic piston mechanism, comprise sleeve, piston and piston rod, piston rod and piston fix, it is characterized in that, piston directly matches with sleeve lining by its outer surface, at interval suitably apart from being processed with some roads annular groove, be the fitting surface that matches with sleeve lining between the annular groove in twos on the outer surface of piston, leave the gap of 2 μ between this fitting surface and the sleeve lining.

2. reciprocating hydraulic piston mechanism according to claim 1 is characterized in that, the section of the annular groove on the described outer surface of piston is a circular arc.