CN2278799Y

CN2278799Y - Oil cylinder with internal oil passage

Info

Publication number: CN2278799Y
Application number: CN 97200774
Authority: CN
Inventors: 周正; 宋慧杰
Original assignee: BEIJING RESEARCH INST OF BUILDING ENGINEERING
Current assignee: BEIJING RESEARCH INST OF BUILDING ENGINEERING
Priority date: 1997-01-23
Filing date: 1997-01-23
Publication date: 1998-04-15
Anticipated expiration: 2007-01-23

Abstract

The utility model discloses a novel oil cylinder with an internal oil passage, which comprises an outer cylinder, an inner cylinder, a middle cylinder and a rear end cover; the rear end cover is provided with an oil mouth for returning and an oil outlet, wherein, the oil mouth for returning is communicated with a long oil hole arranged along the axis line direction of the inner cylinder, and the other end of the long oil hole is communicated with a returning oil cavity; the oil outlet is communicated with the oil cavity for going out of the middle cylinder; the oil passages of the utility model are arranged at the rear end cover and the inner cylinder, the sealing of the outer cylinder and the middle cylinder is simplified, and the structure is novel and compact; under the condition of the same external dimension of the oil cylinder, enough space can be retained in the inner cylinder to be convenient to increase the function of the oil cylinder, and the output force of the oil cylinder is enlarged.

Description

A kind of novel oil cylinder of inner oil line

The utility model relates to a kind of novel oil cylinder.

Existing oil cylinder comprises outer cylinder, inner casing and the middle cylinder between outer cylinder, inner casing, on outer cylinder, have hydraulic fluid port, one of them hydraulic fluid port communicates with the cylinder oil pocket that returns of middle cylinder, another hydraulic fluid port communicates with the cylinder oil pocket that goes out of middle cylinder, the oil cylinder of the reciprocating this structural type of cylinder remained in following shortcoming during variation made by oil pressure: the outer cylinder barrel is thicker, and the less bearing area that makes of the external diameter of middle cylinder piston is little, and it is also little to exert oneself, the outer oil circuit wiring of cylindrical shell disperses, and is not easy to operation, uses.

The purpose of this utility model provides a kind of novel oil cylinder, and the oil circuit layout novelty of this oil cylinder, compactness under identical oil cylinder boundary dimension, can add the external diameter of big-and-middle cylinder piston, can increase the inner casing external diameter.

For achieving the above object, the utility model is taked following design proposal: a kind of novel oil cylinder of inner oil line, it comprises: outer cylinder, inner casing, the middle cylinder between outer cylinder, inner casing, also comprise rear end cover, have back the cylinder hydraulic fluid port on the described rear end cover and go out the cylinder hydraulic fluid port, wherein return the cylinder hydraulic fluid port and communicate with long oil hole along the setting of inner casing axial direction, the other end in this long oil hole communicates with the cylinder oil pocket that returns of middle cylinder, goes out the cylinder hydraulic fluid port and communicates with the cylinder oil pocket that goes out of middle cylinder.

Below in conjunction with accompanying drawing the utility model is described in detail.

Fig. 1: the utility model cylinder structure schematic representation

The A-A sectional drawing of Fig. 2: Fig. 1

As shown in Figure 1 and Figure 2,1 is the outer cylinder of oil cylinder, 5 is inner casing, 2 is the middle cylinder between inside and outside cylinder, 3 is rear end cover, has back cylinder hydraulic fluid port 4 on rear end cover, goes out cylinder hydraulic fluid port 6, and hydraulic fluid port 4 communicates with the long oil hole of offering along the inner casing axial direction, the other end in long oil hole communicates with the cylinder oil pocket that returns of middle cylinder, and hydraulic fluid port 6 directly communicates with the cylinder oil pocket that goes out of middle cylinder.

Advantage of the present utility model: this oil cylinder is not established hydraulic fluid port at outer cylinder, and hydraulic fluid port is located at rear end cap, and Open the long oil hole at the inner cylinder tube axis direction, both simplified the sealing of outer shell and middle cylinder, make again the wall thickness of outer cylinder Can relative thin some, thereby the size of cylinder piston end surface can strengthen in making, and can increase the external diameter of inner casing Also can in inner casing, reserve more sufficient space, be convenient to increase the function of oil cylinder, add exerting oneself of large tank, in addition Outward, outer cylinder is not established hydraulic fluid port, and whole oil cylinder wiring is simple and direct, convenient operation.

Claims

1, a kind of novel oil cylinder of inner oil line, it is characterized in that it comprises: outer cylinder, inner casing, the middle cylinder between outer cylinder, inner casing, also comprise rear end cover, have back the cylinder hydraulic fluid port on the described rear end cover, go out the cylinder hydraulic fluid port, wherein returning the cylinder hydraulic fluid port communicates with long oil hole along the setting of inner casing axial direction, the other end in this long oil hole communicates with the cylinder oil pocket that returns of middle cylinder, goes out the cylinder hydraulic fluid port and communicates with the cylinder oil pocket that goes out of middle cylinder.