A fluid actuator arrangement

Patent metadata

Field	Value
Publication number	US-2018119817-A1
Application number	US-201515567925-A
Country	US
Kind code	A1
Filing date	Apr 21, 2015
Priority date	Apr 21, 2015
Publication date	May 3, 2018
Grant date	—

Abstract

An elongated fluid actuator arrangement includes a cylinder body comprising a first and second end portion. A piston body comprising a piston force area forming portion and a sleeve portion, which extends through said first and second end portions and exposes first and second outer section outside the cylinder body. A piston rod extends coaxially through said sleeve portion. The arrangement comprises a first and second extendable and contractible cover member each joined to the cylinder body and to the respective sleeve portion outer section.

First claim

1 . An elongated fluid actuator arrangement comprising:
cylinder body ( 5 ) comprising a first and second end portion ( 12 ′, 12 ″); piston body ( 7 ) comprising a piston force area forming portion ( 17 , 17 ′) and a sleeve portion ( 21 ), which extends through said first and second end portions ( 12 ′, 12 ″) and exposes first and second outer section ( 34 ′, 34 ″) outside the cylinder body ( 5 ); piston rod ( 3 ) extending coaxially through said sleeve portion ( 21 ); characterized by that the arrangement ( 2 ) comprises a first and second extendable and contractible cover member ( 27 ′, 27 ″, 27 ′″) each joined to the cylinder body ( 7 ) and to the respective sleeve portion ( 21 ) outer section ( 34 ′, 34 ″).

2 . The arrangement according to claim 1 , wherein the extendable and contractible cover member ( 27 ) comprises a hydraulic fluid drain means ( 36 ) arranged for collecting overflow hydraulic fluid.

3 . The arrangement according to claim 2 , wherein the hydraulic fluid drain means ( 36 ) comprises a ring-shaped collecting member ( 91 ) forming an open section ( 93 ) facing the sleeve portion ( 21 ).

4 . The arrangement according to claim 2 or 3 , wherein the hydraulic fluid drain means ( 36 ) forms a gap ( 99 ) between the hydraulic fluid drain means ( 36 ) and the sleeve portion ( 21 ) envelope surface.

5 . The arrangement according to any of claims 2 to 4 , wherein the hydraulic fluid drain means ( 36 ) is positioned adjacent the respective cylinder body ( 5 ) end portion ( 12 ′, 12 ″) and comprises a drainage opening ( 38 ).

6 . The arrangement according to any of the preceding claims, wherein the extendable and contractible cover member ( 27 ) comprises a pressure balancing means ( 63 ).

7 . The arrangement according to claim 6 , wherein the pressure balancing means ( 63 ) comprises a compensating balance line ( 64 ) or hose arranged between the first and second extendable and contractible cover member ( 27 ).

8 . The arrangement according to any of the preceding claims, wherein a seal unit ( 45 ) is arranged in a through hole wall entrance ( 32 ) of the cylinder body ( 5 ) end portion ( 12 ′, 12 ″) permitting a certain hydraulic fluid leakage between the cylinder body ( 5 ) and the sleeve portion ( 21 ).

9 . The arrangement according to claim 8 , wherein the seal unit is comprises a plain bearing.

10 . The arrangement according to claim 9 , wherein the plain bearing comprises bronze alloy and/or tinbronze and/or leadfree bronze and/or copper and/or aluminium-bronze and/or carbon graphite.

11 . The arrangement according to any of the preceding claims, wherein the extendable and contractible cover member ( 27 ) comprises rubber and/or metal material.

12 . The arrangement according to any of the preceding claims, wherein the extendable and contractible cover member ( 27 ) is removable from the actuator.

Assignees

• Saab Ab

Inventors

• Landberg Magnus

Classifications

• F15B15/149

  Fluid interconnections, e.g. fluid connectors, passages · CPC title

• F16J3/046 Primary

  Lubrication or venting arrangements · CPC title

• F15B15/148

  Lost-motion means between the piston and the output · CPC title

• F15B11/183

  Linear stepwise operation · CPC title

• F15B15/1423

  Component parts; Constructional details · CPC title