EP0508973A1 - Piston-cylinder type actuator - Google Patents

Piston-cylinder type actuator Download PDF

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Publication number
EP0508973A1
EP0508973A1 EP92850083A EP92850083A EP0508973A1 EP 0508973 A1 EP0508973 A1 EP 0508973A1 EP 92850083 A EP92850083 A EP 92850083A EP 92850083 A EP92850083 A EP 92850083A EP 0508973 A1 EP0508973 A1 EP 0508973A1
Authority
EP
European Patent Office
Prior art keywords
cylinder tube
end wall
cylinder
piston
grooves
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
EP92850083A
Other languages
German (de)
French (fr)
Other versions
EP0508973B2 (en
EP0508973B1 (en
Inventor
Folke Lennart Röllgardh
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.)
Parker Hannifin AB
Original Assignee
ATLAS COPCO AUTOMATION AB
Parker Pneumatic 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
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Application filed by ATLAS COPCO AUTOMATION AB, Parker Pneumatic AB filed Critical ATLAS COPCO AUTOMATION AB
Publication of EP0508973A1 publication Critical patent/EP0508973A1/en
Application granted granted Critical
Publication of EP0508973B1 publication Critical patent/EP0508973B1/en
Publication of EP0508973B2 publication Critical patent/EP0508973B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1438—Cylinder to end cap assemblies

Definitions

  • the main object of the invention is to create a piston-cylinder type actuator and an end wall mounting method for the same by which the end wall and cylinder tube design as well as the assembly work is substantially simplified and, thereby, less costly.
  • Fig 1 shows a longitudinal section through a piston-cylinder type actuator according to the invention.
  • Figs 2a-c illustrate in three steps the end wall mounting method according to the invention.
  • Fig 3 shows the completed end wall mounting carried through as illustrated in Figs 2a-c.
  • Fig 4 shows an enlarged fraction of Fig 3.
  • Fig. 5 shows an end view of the device in Fig 3.
  • the actuator shown in Fig 1 comprises a cylinder tube 10 with pressure medium communication ports 11, 12 and two end walls 13, 14.
  • One of the end walls 14 has a central opening 16 through which a piston rod 17 extends.
  • the latter has a threaded bore 18 at its outer end for connection to an external load and a threaded inner portion 19 by which a piston 20 is rigidly attached.
  • the piston 20 carries both a seal ring 22 and guide elements 23 for contact with the cylindrical inner surface 24 of the cylinder tube 10.
  • a seal ring 25 is mounted in the end wall opening 16 to sealingly cooperate with the piston rod 17.
  • a coil spring 27 is inserted between the front end wall 14 and the piston 20 to exert a bias load on the latter towards the rear end wall 13.
  • the end walls 13, 14 are formed with circumferential grooves 28 and 29, respectively, for supporting seal rings 30, 31.
  • the end walls 13, 14 are also formed with circumferential mounting grooves 33, 34, which are engaged by lock lugs 35, 36 extending radially inwardly from the inner surface 24 of the cylinder tube 10.
  • the lugs 35, 36 which extend throughout the inner circumference of the cylinder tube 10, are formed by plastic deformation of the latter and form together with the grooves 33, 34 a rigid and permanent mounting means for the end walls 13, 14. Thereby, the flat end surfaces 37, 38 of the end walls 13, 14 are flush with the end surfaces of the cylinder tube 10.
  • the end wall mounting is carried out by means of a mounting tool 40 which serves both as an end wall guiding and introduction means and as a cylinder tube upsetting pressing tool.
  • the tool 40 is formed with a flat front surface 41 and an annular ridge 42 of substantially rectangular cross section and protruding in front of the front surface 41.
  • This ridge 42 has an inner diameter to fit the outside surface 37 of the end wall 13, and the axial extent of the ridge 42 is equal to the distance between the outer end surface 37 of the end wall 13 and the mounting groove 33.
  • the width of the ridge 42 is chosen so as to generate a lug 35 of a correct size to match the groove 33 when pressed against and into the end surface of the cylinder tube 10.
  • the deformation ridge 42 engages the end surface portion 43 of the cylinder tube 10 located at the inner circumference of the latter. See Fig 2b.
  • the embodiments of the invention are not limited to the above described example which includes the formation of a single annular lock lug 35 extending over the entire circumference of the cylinder tube 10.
  • the lock means may comprise a number of shorter lugs distributed over the circumference of the cylinder tube 10, and the mounting groove 33 may as well be replaced by a number of shorter grooves to match the lugs.
  • the mounting tool 40 is formed with a number of short ridge portions for producing such lugs.

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

Abstract

In a piston-cylinder type actuator, at least one cylinder end wall (13, 14) is rigidly mounted to the cylinder tube (10) by being at least partly introduced into the cylinder tube (10) and provided with at least one peripheral groove (33, 34) which is engaged by one or more lock lugs (35, 36) formed by plastic deformation of the cylinder tube (10) simultaneously with the introduction of the end wall (13, 14) into the cylinder tube (10).

Description

  • The invention relates to a piston-cylinder type actuator in which a cylinder tube is fitted with at least one end wall which at least partly is received in the cylinder tube.
  • Mounting of end walls to cylinder tubes in actuators, usually comprise bolt joints, either short bolts extending through flanges on the cylinder tube and the end walls or tension rods bridging both end walls and the entire length of the cylinder tube. Other common end wall mountings comprise mating threads cut directly on the cylinder tube and on the end walls, or lock rings securing the end walls relative to the cylinder tube.
  • In all the above related prior art actuators, there is required extra machining of the cylinder tube and/or additional mounting elements, like bolts and nuts, for mounting the end walls to the cylinder tube. There is also required valuable labour time to carry out the assembly work.
  • The main object of the invention is to create a piston-cylinder type actuator and an end wall mounting method for the same by which the end wall and cylinder tube design as well as the assembly work is substantially simplified and, thereby, less costly.
  • A preferred embodiment of the invention is hereinbelow described in detail with reference to the accompanying drawings.
  • On the drawings:
  • Fig 1 shows a longitudinal section through a piston-cylinder type actuator according to the invention.
  • Figs 2a-c illustrate in three steps the end wall mounting method according to the invention.
  • Fig 3 shows the completed end wall mounting carried through as illustrated in Figs 2a-c.
  • Fig 4 shows an enlarged fraction of Fig 3.
  • Fig. 5 shows an end view of the device in Fig 3.
  • The actuator shown in Fig 1 comprises a cylinder tube 10 with pressure medium communication ports 11, 12 and two end walls 13, 14. One of the end walls 14 has a central opening 16 through which a piston rod 17 extends. The latter has a threaded bore 18 at its outer end for connection to an external load and a threaded inner portion 19 by which a piston 20 is rigidly attached.
  • The piston 20 carries both a seal ring 22 and guide elements 23 for contact with the cylindrical inner surface 24 of the cylinder tube 10. A seal ring 25 is mounted in the end wall opening 16 to sealingly cooperate with the piston rod 17. A coil spring 27 is inserted between the front end wall 14 and the piston 20 to exert a bias load on the latter towards the rear end wall 13.
  • The end walls 13, 14 are formed with circumferential grooves 28 and 29, respectively, for supporting seal rings 30, 31. The end walls 13, 14 are also formed with circumferential mounting grooves 33, 34, which are engaged by lock lugs 35, 36 extending radially inwardly from the inner surface 24 of the cylinder tube 10. The lugs 35, 36, which extend throughout the inner circumference of the cylinder tube 10, are formed by plastic deformation of the latter and form together with the grooves 33, 34 a rigid and permanent mounting means for the end walls 13, 14. Thereby, the flat end surfaces 37, 38 of the end walls 13, 14 are flush with the end surfaces of the cylinder tube 10.
  • As being illustrated in Figs 2a-c, the formation of the lock lug 35 is carried out simultaneously with the introduction of the end wall 13 into the cylinder tube 10.
  • The end wall mounting is carried out by means of a mounting tool 40 which serves both as an end wall guiding and introduction means and as a cylinder tube upsetting pressing tool. For these purposes, the tool 40 is formed with a flat front surface 41 and an annular ridge 42 of substantially rectangular cross section and protruding in front of the front surface 41. This ridge 42 has an inner diameter to fit the outside surface 37 of the end wall 13, and the axial extent of the ridge 42 is equal to the distance between the outer end surface 37 of the end wall 13 and the mounting groove 33. The width of the ridge 42 is chosen so as to generate a lug 35 of a correct size to match the groove 33 when pressed against and into the end surface of the cylinder tube 10. The deformation ridge 42 engages the end surface portion 43 of the cylinder tube 10 located at the inner circumference of the latter. See Fig 2b.
  • In the mounting step illustrated in Fig 2b, the end wall 13 is engaged by the tool 40 and is introduced in the cylinder tube 10. An axially directed force F is applied on the tool 40, and in Fig 2c there is illustrated the final mounting step where the end wall 13 is fully introduced in the cylinder tube 10 and a lug 35 is formed by the pressing tool ridge 42. The lug 35 is actually formed into the groove 33 to thereby fill out the latter completely. A positive locking of the end wall 13 relative to the cylinder tube 10 is obtained. In Fig 3, and in Fig 4 in particular, the completed end wall mounting is shown.
  • It is to be understood that the embodiments of the invention are not limited to the above described example which includes the formation of a single annular lock lug 35 extending over the entire circumference of the cylinder tube 10. Instead, the lock means may comprise a number of shorter lugs distributed over the circumference of the cylinder tube 10, and the mounting groove 33 may as well be replaced by a number of shorter grooves to match the lugs. In such a case, the mounting tool 40 is formed with a number of short ridge portions for producing such lugs.

Claims (7)

  1. Piston-cylinder type actuator, comprising a cylinder tube (10), a piston (20) reciprocably guided in said cylinder tube (10) and at least one end wall (13, 14) which is at least partly received in said cylinder tube (10),
    characterized in that each of said end walls (13, 14) has one or more peripheral grooves (33, 34), and that said cylinder tube (10) has one or more radially inwardly extending peripheral lugs (35, 36) formed by plastic deformation of the end surface of said cylinder tube (10) and arranged to engage said groove or grooves (33, 34) to lock rigidly said end wall (13, 14) relative to said cylinder tube (10).
  2. Actuator according to claim 1, wherein said one or more peripheral grooves (33, 34) comprise a single groove extending throughout the circumference of said end wall (13, 14).
  3. Actuator according to claim 2, wherein said one or more peripheral lugs (35, 36) comprise a single lug extending throughout the inner circumference of said cylinder tube (10).
  4. Actuator according to anyone of claims 1-3, wherein said end wall (13, 14) has a flat outer end surface (37, 38) which is located flush with the respective end surface of the cylinder tube (10) as the end wall (13, 14) is mounted in the cylinder tube (10).
  5. Method for rigidly mounting an end wall (13, 14) to a cylinder tube (10) of a piston-cylinder actuator according to anyone of claims 1-4, wherein said end wall (13, 14) is to be received at least partly in said cylinder tube (10) and is formed with one or more periferal grooves (33, 34),
    characterized by a one-step process in which said end wall (13, 14) is introduced into the cylinder tube (10) simultaneously with the application of a pressing force (F) onto the end surface of the cylinder tube (10) to form by plastic deformation of the latter one or more radially inwardly extending lugs (35, 36) for locking engagement with said peripheral groove or grooves (33, 34) on said end wall (13, 14).
  6. Method according to claim 5, wherein said lug or lugs (35, 36) are formed by said pressing force (F) being applied on one or more portions (42) of said cylinder tube end surface, said portions (42) being located at the inner circumference of said end surface.
  7. Method according to claim 5 or 6, wherein said pressing force (F) is exerted simultaneously with the introduction of said end wall (13, 14) into said cylinder tube (10) by means of a mounting tool (40).
EP19920850083 1991-04-11 1992-04-10 Piston-cylinder type actuator Expired - Lifetime EP0508973B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9101083 1991-04-11
SE9101083A SE468326B (en) 1991-04-11 1991-04-11 Piston CYLINDER DEVICE

Publications (3)

Publication Number Publication Date
EP0508973A1 true EP0508973A1 (en) 1992-10-14
EP0508973B1 EP0508973B1 (en) 1996-07-17
EP0508973B2 EP0508973B2 (en) 1999-09-22

Family

ID=20382429

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920850083 Expired - Lifetime EP0508973B2 (en) 1991-04-11 1992-04-10 Piston-cylinder type actuator

Country Status (3)

Country Link
EP (1) EP0508973B2 (en)
DE (1) DE69212197T3 (en)
SE (1) SE468326B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4414583A1 (en) * 1994-04-27 1995-11-02 Teves Gmbh Alfred Valve
DE4433649A1 (en) * 1994-09-21 1995-11-02 Fichtel & Sachs Ag Assembling piston=cylinder unit for damper
DE19537038A1 (en) * 1995-10-05 1997-04-10 Stephan Thies Master cylinder for hydraulic actuator of motor vehicle
DE19603384A1 (en) * 1996-01-31 1997-08-07 Teves Gmbh Alfred Fastener for mounting of parts in housing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4246631B2 (en) 2001-08-29 2009-04-02 ボッシュ レックスロート アクチエンゲゼルシャフト Hydraulic cylinder
DE10152414B4 (en) * 2001-08-29 2013-01-17 Bosch Rexroth Aktiengesellschaft hydraulic cylinders

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487512A (en) * 1946-01-10 1949-11-08 Automotive & Aircraft Hydrauli Cylinder and cylinder head construction
CH501168A (en) * 1969-08-05 1970-12-31 Bosch Gmbh Robert Compressed air working cylinder for pressure medium systems
DE2115053A1 (en) * 1971-03-29 1972-10-05 Knapp Mikrohydraulik Gmbh Hydraulic or pneumatic cylinder
DE4002558A1 (en) * 1989-02-22 1990-08-23 Knapp Mikrohydraulik Gmbh Simple hydraulic cylinder assembly - has end pieces fitted in length of tube with ends compressed into grooves

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487512A (en) * 1946-01-10 1949-11-08 Automotive & Aircraft Hydrauli Cylinder and cylinder head construction
CH501168A (en) * 1969-08-05 1970-12-31 Bosch Gmbh Robert Compressed air working cylinder for pressure medium systems
DE2115053A1 (en) * 1971-03-29 1972-10-05 Knapp Mikrohydraulik Gmbh Hydraulic or pneumatic cylinder
DE4002558A1 (en) * 1989-02-22 1990-08-23 Knapp Mikrohydraulik Gmbh Simple hydraulic cylinder assembly - has end pieces fitted in length of tube with ends compressed into grooves

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 6, no. 267 (M-182)(1145) 25 December 1982 & JP-A-57 157 863 ( SHIYOUWA ) 29 September 1982 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4414583A1 (en) * 1994-04-27 1995-11-02 Teves Gmbh Alfred Valve
DE4433649A1 (en) * 1994-09-21 1995-11-02 Fichtel & Sachs Ag Assembling piston=cylinder unit for damper
DE19537038A1 (en) * 1995-10-05 1997-04-10 Stephan Thies Master cylinder for hydraulic actuator of motor vehicle
DE19537038B4 (en) * 1995-10-05 2006-05-24 Stephan Thies Master cylinder
DE19603384A1 (en) * 1996-01-31 1997-08-07 Teves Gmbh Alfred Fastener for mounting of parts in housing

Also Published As

Publication number Publication date
DE69212197T2 (en) 1997-03-06
EP0508973B2 (en) 1999-09-22
EP0508973B1 (en) 1996-07-17
SE468326B (en) 1992-12-14
SE9101083L (en) 1992-10-12
DE69212197D1 (en) 1996-08-22
SE9101083D0 (en) 1991-04-11
DE69212197T3 (en) 2000-05-25

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