EP0737282B1 - Cylinder with a non-rotatable piston rod - Google Patents
Cylinder with a non-rotatable piston rod Download PDFInfo
- Publication number
- EP0737282B1 EP0737282B1 EP95905263A EP95905263A EP0737282B1 EP 0737282 B1 EP0737282 B1 EP 0737282B1 EP 95905263 A EP95905263 A EP 95905263A EP 95905263 A EP95905263 A EP 95905263A EP 0737282 B1 EP0737282 B1 EP 0737282B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- piston
- guiding rod
- fastening means
- insert ring
- 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.)
- Expired - Lifetime
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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
Definitions
- the present invention concerns a device in a fluid pressure cylinder, in particular in a pneumatic cylinder, for non-rotatable mounting of a piston rod protruding through a cylinder end wall and being connected to a piston, which is displaceable in a cylinder tube between two cylinder end walls.
- Such devices are being used in cases where the piston rod carries a tool, a holder or the like which must not turn or rotate during the working stroke of the piston, although the particular tool, holder or the like is exposed to a torque.
- a fixed shaft with splines one end of which is fastened to an end wall of the cylinder so as to extend along the central axis of the cylinder, the piston having a central hole with a bushing, which is non-rotatably guided along the splines-shaft.
- the piston is connected to a tubular piston rod portion, which encloses the splines-shaft and extends through the opposite cylinder end wall, where it is connected, e.g., to an external piston rod portion.
- the object of the present invention is to accomplish a device of the kind indicated above, which does not have the above-mentioned drawbacks and which is thus simpler and less expensive as well as more wear-resistant and rigid than the previously known devices.
- a fluid pressure cylinder having at least one rectilinear guiding rod extending axially between the two cylinder end walls and, with a sliding fit, axially through a sealed opening through the piston at a radial distance from the central axis of the cylinder tube, wherein the end portions of the guiding rod are mounted in fastening means at each cylinder end wall, the device being characterized in that at least one of the fastening means is adjustable, at least circumferentially, in connection with the assembly of the fluid pressure cylinder to enable an exact alignment of the guiding rod in parallel to the central axis of the cylinder tube, said fastening means being fixed in position from the outside upon adjustment thereof.
- the guiding rod is located at a radial distance from the central axis, it will effectively counteract a torque acting on the piston rod outside the cylinder. Furthermore, the guiding rod is fixed at both ends, and therefore the rigidity of the device is very good adjacent to each end position of the piston.
- Manufacture and assembly of the device is facilitated by aligning the guiding rod only in connection with the assembly.
- a pneumatic cylinder substantially comprising a cylinder tube 1, two cylinder end walls 2,3 at each end of the cylinder tube, a piston 4 displaceable inside the cylinder tube 1, and a piston rod 5, which is fastened to the piston 4 and extends through one of the cylinder end walls, i.e. the cylinder end wall 3.
- the cylinder tube 1, the cylinder end walls 2,3 and the piston 4 are made of aluminum, whereas the piston rod 5 is made of stainless steel.
- the cylinder tube 1 shown in Fig. 1 is relatively short and may be much longer in a practical case.
- the piston 4 is provided with damping shoulders 4a, which cooperate with central recesses in the end walls 2,3 for damping the piston movement at each end position, and with annular elements around the circumference, i.e. a slide guiding ring 6 of rigid plastic material having a low friction against the inside of the cylinder tube 1 and two sealing rings 7 made of elastic material, located axially on both sides of the slide guiding ring 6 and each having a lip 7a sealing effectively against the cylinder tube. Compare Fig. 3.
- the pneumatic cylinder is also provided with ordinary tension rods 8, which hold the end walls 2, 3 towards the ends of the cylinder tube 1, and with pressurized air connections 9, 10 in the end walls 2, 3 for controlling the movement of the piston 4.
- a guiding rod 11 is mounted inside the cylinder and extends between the end walls 2,3 axially through a through-going, sealed hole 12 in the piston 4.
- the guiding rod 11, which is made of stainless steel in this embodiment, will hereby maintain the piston 4 in a well defined angular position relative to the cylinder tube 1, and the end walls 2,3 and can resist a torque, which is exerted on the piston rod 5 from the outside.
- Such a torque resistance of the piston rod 5 and the piston 4 becomes especially effective because the guiding rod 11 is located at a distance from the central axis L, so that the radial lever, i.e. the distance between the central axis L and the guiding rod 11, is substantial.
- this distance is greater than half the radius of the cylinder tube 1.
- the guiding rod 11 is aligned exactly in parallel to the central axis L, so that the friction is low and wear is avoided as far as possible.
- the ends of the guiding rod 11 are fastened at the end walls 2, 3 in such a way that an adjustment of the fastening can be made in connection with the assembly.
- the fastening means for the guiding rod 11 are constituted by corresponding holes 13a and 14a, respectively, which are bored axially in an insert ring 13 and 14, respectively, located at each end wall 2, 3.
- the insert ring 13 and 14, respectively, is made of aluminum in the embodiment and has a circumferential flange 13b and 14b, respectively, which is fitted into an annular groove 15 and 16, respectively, in the end wall 2, 3 partially in the region of the extension of the cylinder tube 1. Compare Fig. 2.
- the holes 13a, 14a are bored at exactly the same radial distance from the center as the through-going hole 12 in the piston 4.
- the insert rings 13, 14 are fitted with their circumferential flanges 13b, 14b into the respective end wall groove 15, 16, and the cylinder tube 1 is pulled together rather loosely between the cylinder end walls 2, 3, e.g. by manual tightening of the nuts of the tension rods 8.
- each insert ring 13, 14 may be turned around circumferentially.
- the holes 13a, 14a are positioned approximately opposite to each other and approximately in parallel to the central axis L, and the guiding rod 11 is fitted with its end portions into the two holes 13a, 14a.
- the piston 4 is displaced back and forth by means of the piston rod 5, and the insert rings 13, 14 will then be automatically positioned circumferentially when the piston 4 reaches each end position. In this way, a fine positioning is achieved, so that the guiding rod is aligned exactly in parallel to the central axis L.
- the tension rods 8 are tightened to a given tensile value, so that the circumferential flanges 13b, 14b of the insert rings 13, 14 are clamped between the respective ends of the cylinder tube 1 and the bottom of each annular groove 15, 16.
- the necessary sealing is obtained by means of sealing rings 17, 18 (see Fig. 2), which are inserted in corresponding grooves and seal against the inside of the cylinder tube 1 and against the radially outer limiting wall of the annular groove 15 in the end wall, respectively.
- the guiding rod 11 has a certain axial play between the end walls 2 and 3, whereby the guiding rod 11 is kept exactly straight even after clamping the cylinder tube 1 between the end walls 2, 3.
- each insert ring 13, 14 can be locked in such a position, e.g., by boring a hole 19 radially from the outside through the end wall 2, 3 and in a certain distance 20 into the circumferential flange 13b of the insert ring, whereupon a locking pin 21 is inserted, which holds the insert ring in position with a tight fit relative to the end wall. Since the holes 19, 20 are located axially between the sealing rings 17, 18, there will be no leakage of pressurized air in the region of the locking pin 21.
- the insert ring may be locked by a screw extending axially through the end wall 2, 3 and preferably being sealed by means of a hardening glue.
- the through-passage of the guiding rod 11 through the piston 4 is shown clearly in Fig. 3.
- the central portion of the through-going hole 12 has a bushing 22 fitted therein which has a low friction against the guiding rod 11.
- the necessary seal is obtained by means of lip sealing rings 23, 24, which are positioned axially on each side of the bushing 22 and which are held in place by means of washers 25, 26, e.g., made of spring steel.
- the adjustability of the fastening means of the guiding rod 11 can be obtained in various ways.
- a small holding body which is somewhat movable during assembly, e.g., in a corresponding recess in the end wall, and which is fixed in position by means of a screw extending axially through the end wall of the like.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Description
- it is complicated and expensive;
- assembly of the various parts is time-consuming;
- a certain unintentional turning may occur because the splines-shaft is not rigid enough, especially when the piston is located in its end position opposite to the fastened end of the splines-shaft. The problem becomes worse for very long strokes;
- a turning movement may also occur because of a play between the piston bushing and the splines-shaft; because of wear, the play increases with time.
Claims (10)
- A device in a fluid pressure cylinder for non-rotatable mounting of a piston rod (5) protruding through a cylinder end wall (3) and being connected to a piston (4), which is displaceable in a cylinder tube (1) between two cylinder end walls (2, 3), wherein at least one rectilinear guiding rod (11) extends axially between the two cylinder end walls (2, 3) and, with a sliding fit, axially through a sealed opening (12) through the piston at a radial distance from the central axis (L) of the cylinder tube (1), and wherein the end portions of the guiding rod (11) are mounted in fastening means (13a, 14a) at each cylinder end wall (2, 3), characterized in that at least one of the fastening means is adjustable, at least circumferentially, in connection with the assembly of the fluid pressure cylinder to enable an exact alignment of the guiding rod in parallel to the central axis (L) of the cylinder tube, and in that said fastening means is fixed in position from the outside upon adjustment thereof.
- Device according to claim 1, characterized in that both of said fastening means (13, 14) are adjustable.
- Device according to claim 1 or 2, characterized in that each of the fastening means (13a, 14a) is adjustable by displacing the piston (4) between its end positions upon assembly of the fluid pressure cylinder.
- Device according to any one of claims 1 - 3,
characterized in that the guiding rod (11) is mounted with an axial play at at least one of the cylinder end walls (2, 3). - Device according to any one of claims 1 - 4, characterized in that each fastening means is disposed at an insert ring (13, 14) of rigid material, located at the inside of the associated cylinder end wall, said insert ring being movable upon assembly of the fluid pressure cylinder.
- Device according to claim 5, characterized in that the respective insert ring (13, 14) is kept radially fixed but is circumferentially rotatable relative to the cylinder end walls (2, 3) upon assembly of the fluid pressure cylinder.
- Device according to claim 6, characterized in that each insert ring (13, 14) is fixed in position by clamping an outer flange (13b, 14b) thereof between the associated cylinder end wall (2, 3) and the cylinder tube (1).
- Device according to claim 6 or 7, characterized in that each insert ring (13, 14) is fastenable by means a locking means (21) insertable from the outside of the cylinder end wall.
- Device according to any one of claims 5 - 8,
characterized in that said fastening means comprises an axial recess (13a, 14a) in the respective insert ring (13, 14), said axial recess being dimensioned to receive an end portion of the guiding rod with a sliding fit and being bored at the same radial distance from the center as the axially through-going opening (12) in the piston. - Device according to any one of the preceding claims, characterized in that a bushing (22) is inserted in the axially through opening (12) of the piston, sealing rings (23, 24) being inserted axially on both sides of the bushing for sealing between the guiding rod (11) and the piston (4), which sealing rings (23, 24) are fastened by means of washers (25, 26).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9304352A SE509233C2 (en) | 1993-12-30 | 1993-12-30 | Cylinder with reversible piston rod |
SE9304352 | 1993-12-30 | ||
PCT/SE1994/001205 WO1995018322A1 (en) | 1993-12-30 | 1994-12-14 | Cylinder with a non-rotatable piston rod |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0737282A1 EP0737282A1 (en) | 1996-10-16 |
EP0737282B1 true EP0737282B1 (en) | 1999-06-16 |
Family
ID=20392275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95905263A Expired - Lifetime EP0737282B1 (en) | 1993-12-30 | 1994-12-14 | Cylinder with a non-rotatable piston rod |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0737282B1 (en) |
DE (1) | DE69419177T2 (en) |
SE (1) | SE509233C2 (en) |
WO (1) | WO1995018322A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE520017C2 (en) * | 1997-10-31 | 2003-05-06 | Mecman Ab Rexroth | Pressure fluid cylinder |
DE10063713A1 (en) * | 2000-12-20 | 2002-07-18 | Bosch Gmbh Robert | Device for measuring the injection quantity of injection systems and method for their production |
CN105170364A (en) * | 2015-08-10 | 2015-12-23 | 王及忠 | Novel cylinder for coating machine |
CN105387021A (en) * | 2015-12-25 | 2016-03-09 | 河海大学常州校区 | Built-in guide oil cylinder |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2637290A1 (en) * | 1976-08-19 | 1978-02-23 | Arbo Haudeck | Ram unit providing confined reciprocal motion - has cylinder breech ends joined by anchor bolts forming piston guides to prevent rotation |
-
1993
- 1993-12-30 SE SE9304352A patent/SE509233C2/en not_active IP Right Cessation
-
1994
- 1994-12-14 DE DE69419177T patent/DE69419177T2/en not_active Expired - Fee Related
- 1994-12-14 WO PCT/SE1994/001205 patent/WO1995018322A1/en active IP Right Grant
- 1994-12-14 EP EP95905263A patent/EP0737282B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
WO1995018322A1 (en) | 1995-07-06 |
SE9304352D0 (en) | 1993-12-30 |
DE69419177D1 (en) | 1999-07-22 |
SE509233C2 (en) | 1998-12-21 |
EP0737282A1 (en) | 1996-10-16 |
DE69419177T2 (en) | 1999-12-16 |
SE9304352L (en) | 1995-07-01 |
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