CN2861120Y - Inner-oil-return type single-action piston cylinder for lifting fork lift - Google Patents

Inner-oil-return type single-action piston cylinder for lifting fork lift Download PDF

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Publication number
CN2861120Y
CN2861120Y CN 200620088950 CN200620088950U CN2861120Y CN 2861120 Y CN2861120 Y CN 2861120Y CN 200620088950 CN200620088950 CN 200620088950 CN 200620088950 U CN200620088950 U CN 200620088950U CN 2861120 Y CN2861120 Y CN 2861120Y
Authority
CN
China
Prior art keywords
oil
piston
cylinder
rod
action
Prior art date
Application number
CN 200620088950
Other languages
Chinese (zh)
Inventor
姜秀渤
林枢
师惠
臧传民
张利杰
Original Assignee
大连叉车有限责任公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大连叉车有限责任公司 filed Critical 大连叉车有限责任公司
Priority to CN 200620088950 priority Critical patent/CN2861120Y/en
Application granted granted Critical
Publication of CN2861120Y publication Critical patent/CN2861120Y/en

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Abstract

An inner oil-return piston jar of single action for the lifting of fork-lift truck which is characterized in that a straight pass air chamber located on the end the piston rod which can run up and down along the inner guide sleeve of cylinder, the oil hole fixed on the lateral wall of piston rod connecting the air chamber and rod end chamber, the check valve communicating with the air chamber of piston rod which fixed on the base of piston running up and down along the inner guide sleeve of cylinder. Contrasting with the existing art, the advantages of inner oil-return piston jar of single action are as follows: no externally connected oil return pipe, which eliminates the hidden trouble of fuel leaking of the pipe and the piping layout. The inner oil-return piston jar of single action designed on the third class upright mounting of the fork-lift truck can reduce the volume of the jar of first class and second class without the changes of systematic pressure to enlarge the visual field of the upright mounting and facilitate the pipe layout of the upright mounting.

Description

Fork truck hoists with interior oil-return type single action piston cylinder
Technical field the utility model relates to a kind of fork truck and hoists with interior oil-return type single action piston cylinder.
Background technology is in existing fork truck, the first order of the three grades of door frames cylinder that hoists adopts plunger case, its shortcoming is that the cylinder body external diameter is big, be unfavorable for piping layout, influence the visual field again, if adopt outer oil-return type single action piston cylinder then can reduce cylinder diameter, but outer oil-return type single action piston cylinder needs at the external oil return pipe of oil cylinder, its weak point is the oil return pipe complicated layout, and neither attractive in appearance, has leakage of oil hidden danger again.Therefore people consider oil return in the oil cylinder, and the structure of the outer oil return pipe of cancellation then can address the above problem, and has designed interior oil-return type single action piston cylinder.
The summary of the invention the purpose of this utility model is to overcome weak point in the prior art, and provides a kind of fork truck to hoist with interior oil-return type single action piston cylinder.Oil-return type single action piston cylinder comprises cylinder barrel, orienting sleeve, piston rod, piston in this, can be provided with the hole shape energy chamber along the piston-rod lower end of orienting sleeve lifting in the cylinder barrel, as taper hole shape energy chamber, straight hole shape energy chamber, straight hole shape energy chamber preferably, the sidewall of this piston rod is provided with the oilhole that is communicated with energy chamber and rod end chamber, can be provided with the check valve that can communicate with the piston rod energy chamber along the bottom of the piston of cylinder barrel lifting.
The action principle of interior oil-return type single action piston is: handle lifting lever, when door frame hoists, high pressure oil enters plunger shaft from oil inlet and outlet, thereby promoting piston rises, the air of rod end chamber and interior leakage of oil need to discharge, outer oil-return type single action piston cylinder is discharged to air and interior leakage of oil in the fuel tank by external oil return pipe, and interior oil-return type single action piston cylinder does not have external oil return pipe, its exhaust oil extraction mode is as follows: when piston rises, the pressurized air of rod end chamber enters the energy chamber of piston rod by the oilhole of piston rod sidewall, the interior leakage of oil of rod end chamber also enters the energy chamber of piston rod by this oilhole, when interior leakage of oil amount reached certain value, the pressure of energy chamber increases to can open check valve, and then interior leakage of oil is got back to plunger shaft by this check valve, the pressure of energy chamber reduces after the oil extraction, closed check valve.Handle lifting lever, when door frame descended, the oil of plunger shaft was got back to control cock by oil inlet and outlet, returns fuel tank.The design of the energy chamber by piston rod and the check valve of piston has just solved exhaust oil extraction problem.
Compared with prior art, the advantage of interior oil-return type single action piston cylinder is: do not have external oil return pipe, eliminated the leakage of oil hidden danger of oil return pipe, and do not have the oil return line Layout Problem again.Piston cylinder is compared with plunger case under system pressure unmodified situation, and the external diameter of piston cylinder is less than the external diameter of plunger case, helps the layout of the visual field and pipeline in forklift door frame uses.Oil return single action piston cylinder on three grades of door frames of fork truck, adopting, under system pressure unmodified situation, not only can reduce the volume of first order oil cylinder, can reduce the volume of second stage oil cylinder simultaneously again, make the visual field property raising of door frame, be easy to the layout of door frame pipeline.
Description of drawings
Fig. 1 is the utility model structural representation.
The utility model will be further described in conjunction with the accompanying drawings for the specific embodiment, oil-return type single action piston cylinder comprises cylinder barrel 1, orienting sleeve 2, piston rod 3, piston 4 in this, the lower end of piston rod is provided with straight hole shape energy chamber 5, the sidewall of piston rod is provided with the oilhole 7 that is communicated with energy chamber and rod end chamber 6, the bottom of piston is provided with check valve 8, can be used as the path of energy chamber and plunger shaft 9, plunger shaft communicates with oil inlet and outlet 10, be provided with seal ring 11 between piston rod and orienting sleeve, be provided with combined seal ring 12 between piston and cylinder barrel.

Claims (1)

1. a fork truck hoists with interior oil-return type single action piston cylinder, it is characterized in that: can be provided with straight hole shape energy chamber along the piston-rod lower end of orienting sleeve lifting in the cylinder barrel, the sidewall of this piston rod is provided with the oilhole that is communicated with energy chamber and rod end chamber, can be provided with the check valve that can communicate with the piston rod energy chamber along the bottom of the piston of cylinder barrel lifting.
CN 200620088950 2006-01-11 2006-01-11 Inner-oil-return type single-action piston cylinder for lifting fork lift CN2861120Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200620088950 CN2861120Y (en) 2006-01-11 2006-01-11 Inner-oil-return type single-action piston cylinder for lifting fork lift

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200620088950 CN2861120Y (en) 2006-01-11 2006-01-11 Inner-oil-return type single-action piston cylinder for lifting fork lift

Publications (1)

Publication Number Publication Date
CN2861120Y true CN2861120Y (en) 2007-01-24

Family

ID=37658745

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200620088950 CN2861120Y (en) 2006-01-11 2006-01-11 Inner-oil-return type single-action piston cylinder for lifting fork lift

Country Status (1)

Country Link
CN (1) CN2861120Y (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103233940A (en) * 2013-05-06 2013-08-07 赵明 Buffer hydraulic cylinder for forklift
CN103511389A (en) * 2013-10-15 2014-01-15 湖南特力液压有限公司 Singe-acting hydraulic cylinder
CN104528599A (en) * 2014-11-13 2015-04-22 安徽乐库智能停车设备有限公司 Safe and wear-resistant oil supply system of lifting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103233940A (en) * 2013-05-06 2013-08-07 赵明 Buffer hydraulic cylinder for forklift
CN103511389A (en) * 2013-10-15 2014-01-15 湖南特力液压有限公司 Singe-acting hydraulic cylinder
CN103511389B (en) * 2013-10-15 2015-07-15 湖南特力液压有限公司 Singe-acting hydraulic cylinder
CN104528599A (en) * 2014-11-13 2015-04-22 安徽乐库智能停车设备有限公司 Safe and wear-resistant oil supply system of lifting device

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
EXPY Termination of patent right or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20070124

Termination date: 20150111