GB2149462A - Piston-cylinder device - Google Patents

Piston-cylinder device Download PDF

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Publication number
GB2149462A
GB2149462A GB08428147A GB8428147A GB2149462A GB 2149462 A GB2149462 A GB 2149462A GB 08428147 A GB08428147 A GB 08428147A GB 8428147 A GB8428147 A GB 8428147A GB 2149462 A GB2149462 A GB 2149462A
Authority
GB
United Kingdom
Prior art keywords
bearing portion
piston
piston rod
cylinder device
cylinder
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB08428147A
Other versions
GB2149462B (en
GB8428147D0 (en
Inventor
Folke Lennart Johansson
Stig-Erling Gustavsson
Hans Anders Torner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Atlas Copco AB
Original Assignee
Atlas Copco AB
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 Atlas Copco AB filed Critical Atlas Copco AB
Publication of GB8428147D0 publication Critical patent/GB8428147D0/en
Publication of GB2149462A publication Critical patent/GB2149462A/en
Application granted granted Critical
Publication of GB2149462B publication Critical patent/GB2149462B/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1414—Characterised by the construction of the motor unit of the straight-cylinder type with non-rotatable piston
    • F15B15/1419—Characterised by the construction of the motor unit of the straight-cylinder type with non-rotatable piston of non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1414—Characterised by the construction of the motor unit of the straight-cylinder type with non-rotatable piston

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

A pressure fluid operated piston-cylinder device comprises a cylinder end wall extension forming a piston rod bearing portion (20). The piston rod (15) has a non-circular cross section for cooperation with a mating opening in the bearing portion (20), thereby preventing relative rotation between the piston rod (15) and the cylinder (10). The bearing portion (20) is provided with six equally distributed axial slots (21), the slots being shorter than the bearing portion (20). The portion is lined with a bearing sleeve (23) made of high density polyethylene. The bearing portion (20) is radially compressible by means of wedge rings (24-27) so as to accomplish adjustment of the radial as well as the rotational play between the cylinder end wall (12) and the piston rod (15). <IMAGE>

Description

SPECIFICATION Piston-cylinder device This invention concerns a pressure fluid operated piston cylinder device in which the piston rod extends outofthecylinderthrough an opening in oneofthe cylinder end walls to engage an external work load. In particular, the invention relates to a piston-cylinder device in which the piston rod has a non-circular cross section so as to prevent relative rotation between the piston and the cylinder.
An object ofthe present invention isto provide a piston cylinder device in which the piston rod has a non-circular cross section and in which the radial as well as the rotational play between the piston rod and the cylinder is readily adjustable.
According to the present invention there is provided pressure fluid operated piston-cylinder device, comprising a piston rod of a non-circularcrosssection connected to the piston and extending outofthe cylinder th rough an opening in one of the cylinder end walls to engage an external workload, said opening having a non-circular cross section mating with the piston road cross section for preventing rotation of the piston rod relative to the cylinder, characterized in that said cylinder end wall comprises an axially-extended bearing portion which surrounds said opening, said bearing portions being provided with axially-extending radial slots for enabling radial compression of said bearing portion, and an adjustable wedge means surrounding said bearing portion and being arranged to exert a radial compression force on the latter, wherebythe radial as well asthe rotational play between the piston rod and the bearing portion may be set simultaneously.
Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings in which: Fig. 1 shows a side view, partly in section, of a piston-cylinder device according to the invention.
Fig. 2 shows, on a larger scale, a fragmental section through the device shown in Fig. 1.
Fig .3 shows a cross sectional viewtaken along line Ill-Ill in Fig. 1.
Fig. 4shows a longitudinal sectionthrough the cylinder end wall with an alternatively designed adjusting means.
The piston cylinder device shown in Fig. 1 compris es a cylinder 10 having a rearend wall 11 and a forward end wall 12.A piston 14and a piston rod 15 are displaceably guided in the cylinder. The piston rod 15 is formed with an enlarged portion 16 which is arranged to cooperate with a damping seal ring 17 in the cylinder. The cylinder end wall 12 is provided with a pressure fluid inlet 19 and an axially extended bearing portion 20. This portion 20 is provided with six equally distributed axial slots 21 the purpose of which isto weaken the bearing portion 20 to, thereby, enabling radial compression thereof. The slots 21 are shorter than the bearing portion 20 and do not reach the outer end thereof.
The portion 20 is lined with a bearing sleeve 23 which defines the cylinder end wall opening 22 through which the piston rod 15 extends. This sleeve 23 is preferably made of an elastically deformable low-friction material such as a high density polyethylene.
The piston rod 15 has a rounded non-circular cross section and is prevented from rotation by cooperation with the cylinder end wall opening 22 which has a mating cross sectional configuration. As appears from Fig. 3, the piston rod cross section according to the shown and described embodiments ofthe invention is of a trisectional epitrochoidal shape. This particular configuration is characterized by comprising three small radius crests angularly spaced bythree large radius crests and by having a constant cross dimension.
Due to the non-circular rounded cross section of the piston rod 15 it is possible to accomplish a setting of the radial as well as the rotational play of the piston rod 15 by radial compression ofthe bearing portion 20 of thecylinderend wall 12. In order to vary the radial setting of the bearing portion 20 there are provided two pairs of conical wedge rings 24,25 and 26,27.
These rings 24-27 are surrounded by a cylindrical support sleeve 28.
In ordertofacilitate radial compression ofthe inner rings 24,26 which are in contact with the bearing portion 20, these rings 24,26 are divided into two halves. (See Fig. 3). The wedge rings 24-27 are preferably made of an aluminium alloy.
On a thread 30 on the outer end ofthe bearing portion 20 there is engaged a ring nut 31 the purpose of which is to apply an axial clamp force upon the wedge rings 24-27. Attheiropposite ends, the rings 24-27 are resting against a shoulder 32 on the cylinder end wall 12.
In the outer part ofthe bearing portion 20 as well as in the cylinder end wall 12 there are inserted resilient seal rings 34 and 35, respectively. These seal rings are of a conventional circular design but assume the shape ofthe piston rod and the bearing portion 20 when inserted in the device.
By the above described piston-cylinder device comprising the trisectional epitrochoidal cross section piston rod there is obtained a rotation preventing means which does not require any specially designed seal means and by which the rotational and radial play is easily set. According to the adjusting means shown in Fig. 4, the ring nut 31 and the outer support sleeve 28 are substituted by a setting sleeve 40. The latter is provided with a number of axially directed holes 41 through which set screws 42 extend. The screws 42 engage threaded bores 44 in the cylinder end wall 12.
A radial shoulder43 in the sleeve 40 exerts an axial clamp force on the conical wedge rings 24-27, and by tightening the screws 42 an increased radial compression force is generated by the conical rings 24-27 and closerthe fit is obtained between the piston rod 15 and the bearing portion 20. The radial compression of the bearing portion 20 not only decreases the radial play between the piston rod 15 and the cylinder bearing portion 20 but diminishes the rotational play therebetween as well.
It is to be noticed, however, that the invention is not restricted to embodiments comprising a trisectional epitrochoidal cross section piston rod, but concerns all variations including non-circular cross section piston rods bywhich not only the radial play but also the rotational play may be adjusted by compression of the piston rod bearing portion.

Claims (7)

1. Pressure fluid operated piston-cylinder device, comprising a piston rod of a non-circular cross section connected to the piston and extending out ofthe cylinderthrough an opening in one ofthe cylinder end wallsto engage an external work load, said opening having a non-circular cross section mating with the piston road cross section for preventing rotation of the piston rod relative to the cylinder, characterized in that said cylinder end wall comprises an axially-extended bearing portion which surrounds said opening, said bearing portion being provided with axially-extending radial slotsforenabling radial compression of said bearing portion, and an adjustable wedge means surrounding said bearing portion and being arranged to exert radial compression force on the latter wherebythe radial as well as the rotational play between the piston rod and the bearing portion may be set simultaneously.
2. Piston-cylinder device according to claim 1, wherein said bearing portion has an outer envelope surface of a circular cylindrical shape, and said wedge means comprises at least one pair of interacting conical rings axially pressed together by an adjustable clamp means.
3. Piston-cylinder device according to claim 2, wherein said clamp means comprises a nut cooperating with an external thread on said bearing portion.
4. Piston-cylinder device according to claim 2, wherein said clamp means comprises a ring element axially slidable on the outside of said bearing portion and a numberofaxially-extending screws arranged to force said ring element againstsaid conical rings.
5. Piston-cylinder device according to any of claims 1-4, wherein each of said slots penetrates radially said bearing portion but has a length that is smallerthanthe length of said bearing portion and is disposed not to reach the free end of said bearing portion.
6. Piston-cylinder device accordingto any of claims 1-5, wherein said non-circular cross section of said piston rod and said opening isofatrisectional epitrochoidal shape.
7. A piston-cylinder device substantially as herein before described with reference to Figs. 1 to 3 or Fig. 4 of the accompanying drawings.
GB08428147A 1983-11-09 1984-11-07 Piston-cylinder device Expired GB2149462B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8306150A SE443628B (en) 1983-11-09 1983-11-09 PRESSURE FLUID DRIVE PISTON AND CYLINDER DEVICE

Publications (3)

Publication Number Publication Date
GB8428147D0 GB8428147D0 (en) 1984-12-12
GB2149462A true GB2149462A (en) 1985-06-12
GB2149462B GB2149462B (en) 1987-05-20

Family

ID=20353237

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08428147A Expired GB2149462B (en) 1983-11-09 1984-11-07 Piston-cylinder device

Country Status (4)

Country Link
DE (1) DE3440624A1 (en)
FR (1) FR2554518B1 (en)
GB (1) GB2149462B (en)
SE (1) SE443628B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999018354A3 (en) * 1997-10-03 1999-05-20 Basil International Inc Walking beam compressor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009026118A1 (en) * 2009-07-07 2011-01-13 Röhm Gmbh Pneumatic clamping cylinder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB642356A (en) * 1948-04-21 1950-08-30 Herbert Ltd A Roller bearings
GB877526A (en) * 1958-10-09 1961-09-13 Heinrich Gieren Method of producing composite bushings
GB1025670A (en) * 1964-03-14 1966-04-14 Krantz Verwaltungs G M B H H A carbon bearing for shafts revolving in high temperature rooms

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE856717C (en) * 1942-12-11 1952-11-24 Mueller Fritz Adjustable guide for movable pressure pieces from presses and like
DE1934382U (en) * 1965-12-13 1966-03-10 Festo Maschf Stoll G PISTON ROD WITH GUIDANCE FOR A PISTON, FILLED WITH A PNEUMATIC OR HYDRAULIC PRESSURE MEDIUM.
DE6750643U (en) * 1968-08-27 1969-01-09 Griebel Gmbh & Co Kommanditges ROUND PILLAR GUIDE, IN PARTICULAR FOR PRESS BRAKES
US3884128A (en) * 1972-07-06 1975-05-20 Dura Corp Combination centering bearing and stop for car lift pistons
DK127755B (en) * 1972-07-18 1973-12-31 Atomenergikommissionen Guide for supporting a rod-shaped body with a nominal circular cross-section.
DE2623594C2 (en) * 1976-05-26 1984-12-13 Messerschmitt-Boelkow-Blohm Gmbh, 8012 Ottobrunn Guide element for push rods of redundant electrohydraulic actuating arrangements

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB642356A (en) * 1948-04-21 1950-08-30 Herbert Ltd A Roller bearings
GB877526A (en) * 1958-10-09 1961-09-13 Heinrich Gieren Method of producing composite bushings
GB1025670A (en) * 1964-03-14 1966-04-14 Krantz Verwaltungs G M B H H A carbon bearing for shafts revolving in high temperature rooms

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999018354A3 (en) * 1997-10-03 1999-05-20 Basil International Inc Walking beam compressor
US6164935A (en) * 1997-10-03 2000-12-26 Basil International, Inc. Walking beam compressor
US6305918B2 (en) 1997-10-03 2001-10-23 Basil International, Inc. Piston rod seal assembly for walking beam compressor
US6572116B2 (en) 1997-10-03 2003-06-03 Basil Turiansky Piston assembly for walking beam compressor

Also Published As

Publication number Publication date
GB2149462B (en) 1987-05-20
FR2554518A1 (en) 1985-05-10
GB8428147D0 (en) 1984-12-12
FR2554518B1 (en) 1990-02-02
SE8306150L (en) 1985-05-10
SE443628B (en) 1986-03-03
SE8306150D0 (en) 1983-11-09
DE3440624A1 (en) 1985-05-15

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19931107