CN203146475U

CN203146475U - Buffering oil cylinder

Info

Publication number: CN203146475U
Application number: CN 201320109913
Authority: CN
Inventors: 刘文欣; 高翔; 杨帆
Original assignee: BENGBU PLANETARY ENGINEERING MACHINERY Co Ltd
Current assignee: BENGBU PLANETARY ENGINEERING MACHINERY Co Ltd
Priority date: 2013-03-11
Filing date: 2013-03-11
Publication date: 2013-08-21
Anticipated expiration: 2023-03-11

Abstract

Provided is a buffering oil cylinder. An end cover is connected at the opening end of a cylinder body, a piston is arranged at one end, extending into the cylinder body, of a piston rod, a first buffering sleeve and a second buffering sleeve are arranged on two sides of the piston respectively, a first buffering hole matched with the first buffering sleeve is formed in the bottom side of the cylinder body, a second buffering hole matched with the second buffering sleeve is formed in the inner side of the end cover, a first spring is arranged between the first buffering sleeve and the piston, a second spring is arranged between the second buffering sleeve and the piston, a first row of oil grooves are formed in the positions, provided with the first buffering sleeve and the first spring, of the piston rod, and a second row of oil grooves are formed in the positions, provided with the second buffering sleeve and the second spring, of the piston rod. After the piston moves to the first buffering sleeve and is matched with the first buffering hole, along with the continuous movement of the piston, the throttling area of the first row of oil grooves is gradually reduced, buffering pressure of oil liquid is gradually increased, and therefore a good buffering effect is achieved. Similarly, when the piston moves towards the direction of the end cover and is close to the end cover, the piston can also get good buffering.

Description

A kind of cushion cylinder

Technical field

The utility model relates to a kind of oil hydraulic cylinder, specifically a kind of cushion cylinder.

Background technique

In engineering machinery, hydraulic jack is main power performance element.Usually the buffer structure that adopts in the existing oil cylinder is: the both sides of piston are respectively equipped with the cushion collar that is loaded on the piston rod, have the cushion hole that cooperates with corresponding cushion collar on cylinder bottom and the end cap.When existing sort buffer structure buffering began, the buffer-braking power of generation was very big, but will soon reduce, and still has the rigid impulse phenomenon at last, and its cushioning effect is unsatisfactory.

The model utility content

The purpose of this utility model is to provide a kind of cushion cylinder, and this oil cylinder during near limit position, has shock-absorbing capacity preferably at the stroke of its piston.

For achieving the above object, the utility model adopts following scheme: a kind of cushion cylinder, the opening end of cylinder body is connected with end cap, the end that piston rod stretches in cylinder body is equipped with piston, the both sides of piston are respectively equipped with first cushion collar that is loaded on the piston rod, second cushion collar, have first cushion hole that is mated on the cylinder body bottom side relative with first cushion collar, have first oil drainage hole that communicates with first cushion hole on the cylinder body, the inboard of the end cap relative with second cushion collar has second cushion hole that is mated, have second oil drainage hole that communicates with second cushion hole on the end cap, be provided with first spring that is placed on the piston rod between first cushion collar and the piston, be provided with second spring that is placed on the piston rod between second cushion collar and the piston, the position that first cushion collar and first spring are installed on the piston rod has first oil-discharge trough, the width of first oil-discharge trough along first cushion collar to piston direction from large to small, the position that second cushion collar and second spring are installed on the piston rod has second oil-discharge trough, and the width of second oil-discharge trough along second cushion collar to piston direction from large to small.

By such scheme as seen, after piston moves to first cushion collar and first cushion hole cooperates to the cylinder body bottom side, continuation operation along with piston, the cooperation position of first cushion collar and first oil-discharge trough changes, the orifice size of first oil-discharge trough reduces gradually, fluid increases gradually to the compensator or trimmer pressure of piston oil extraction side, and then reaches buffer function preferably; In like manner, when piston to the end cap direction move to it near the time, piston also can be cushioned preferably.

The beneficial effects of the utility model are to have overcome existing hydraulic jack has the rigid impulse phenomenon when the extreme limit of travel position defective, it has good cushioning effect, and can reduce the concentric requirement that the piston rod end cooperates with oil cylinder, make the processing of piston rod easier.

Description of drawings

Fig. 1 is the utility model one embodiment's structural representation;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the B-B sectional view of Fig. 1.

Embodiment

Further specify the utility model below in conjunction with embodiment and accompanying drawing.

Referring to Fig. 1

The opening end of its cylinder body 3 of the cushion cylinder that the utility model provides is connected with end cap 1, the end that piston rod 2 stretches in cylinder body 3 is equipped with piston 6, the both sides of piston 6 are respectively equipped with first cushion collar 8 that is loaded on the piston rod, second cushion collar 4, have the first cushion hole 3b that is mated on cylinder body 3 bottom sides relative with first cushion collar 8, have the first oil drainage hole 3a that communicates with the first cushion hole 3b on the cylinder body 3, the inboard of the end cap 1 relative with second cushion collar 4 has the second cushion hole 1b that is mated, and has the second oil drainage hole 1a that communicates with the second cushion hole 1b on the end cap 1.Be provided with first spring 7 that is placed on the piston rod between first cushion collar 8 and the piston 6, be provided with second spring 5 that is placed on the piston rod between second cushion collar 4 and the piston 6, the position that first cushion collar 8 and first spring 7 are installed on the piston rod 2 has the first oil-discharge trough 2b, the width of the first oil-discharge trough 2b along first cushion collar 8 to piston 6 directions from large to small, the position that second cushion collar 4 and second spring 5 are installed on the piston rod 2 has the second oil-discharge trough 2a, and the width of the second oil-discharge trough 2a along second cushion collar 4 to piston 6 directions from large to small.

Referring to Fig. 2, Fig. 3

In the present embodiment, structure and the quantity of the first oil-discharge trough 2b, the second oil-discharge trough 2a are identical, the first oil-discharge trough 2b, the second oil-discharge trough 2a that have on the piston rod are four, and four first oil-discharge trough 2b and four second oil-discharge trough 2a are circumferentially uniform in piston rod 2 upper edges.

As seen from Figure 1, when piston 6 to cylinder body bottom side operation and with it near the time, first cushion collar 8 cooperates with the first cushion hole 3b earlier, oil in the oil-discharging cavity is discharged by the first oil drainage hole 3a through the first oil-discharge trough 2b and the first cushion hole 3b, along with piston 6 continues to move to cylinder body 3 bottom sides, first spring 7 is compressed, first cushion collar 8 moves to piston 6, the cooperation position of first cushion collar 8 and the first oil-discharge trough 2b changes, the first oil-discharge trough 2b wide portions is blocked by piston gradually, the orifice size of the first oil-discharge trough 2b reduces gradually, and the oil-discharging cavity inner fluid increases gradually to the compensator or trimmer pressure of piston 6 oil extraction sides, and then reaches buffer function preferably; In like manner, when piston 6 to end cap 1 direction move to it near the time, piston also can be cushioned preferably.

Claims

1. cushion cylinder, the opening end of cylinder body is connected with end cap, the end that piston rod stretches in cylinder body is equipped with piston, the both sides of piston are respectively equipped with first cushion collar that is loaded on the piston rod, second cushion collar, have first cushion hole that is mated on the cylinder body bottom side relative with first cushion collar, have first oil drainage hole that communicates with first cushion hole on the cylinder body, the inboard of the end cap relative with second cushion collar has second cushion hole that is mated, have second oil drainage hole that communicates with second cushion hole on the end cap, it is characterized in that: be provided with first spring that is placed on the piston rod between first cushion collar and the piston, be provided with second spring that is placed on the piston rod between second cushion collar and the piston, the position that first cushion collar and first spring are installed on the piston rod has first oil-discharge trough, the width of first oil-discharge trough along first cushion collar to piston direction from large to small, the position that second cushion collar and second spring are installed on the piston rod has second oil-discharge trough, and the width of second oil-discharge trough along second cushion collar to piston direction from large to small.

2. cushion cylinder according to claim 1, it is characterized in that: first oil-discharge trough that has on the piston rod, second oil-discharge trough are four, and four first oil-discharge troughs and four second oil-discharge troughs are circumferentially uniform in the piston rod upper edge.