Control system comprising a control rod

Patent metadata

Field	Value
Publication number	US-10131420-B2
Application number	US-201615012339-A
Country	US
Kind code	B2
Filing date	Feb 1, 2016
Priority date	Feb 2, 2015
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

Control system ( 1 ) comprising a control rod ( 5 ) extending between a first zone ( 2 ) situated in a hydraulic chamber delimited by a chamber wall ( 3 ) and a second zone ( 4 ) situated outside the hydraulic chamber. The control system ( 1 ) further comprising a seal ( 6 ) arranged around and against this control rod ( 5 ) to oppose the passage of fluid between the first and second zones ( 2, 4 ). The system further comprises a guide piece ( 7 ) assembled removably with respect to the chamber wall ( 3 ), the seal ( 6 ) is assembled inside the guide piece ( 7 ) so as to allow relative movement of the rod ( 5 ) with respect to the guide piece ( 7 ) while at the same time achieving sealing between the first and second zones ( 2, 4 ).

First claim

The invention claimed is:

1. A control system ( 1 ) comprising:
a chamber wall ( 3 ) delimiting a hydraulic chamber;
a control rod ( 5 ) extending between:
a first zone ( 2 ) situated in said hydraulic chamber delimited by said chamber wall ( 3 ); and
a second zone ( 4 ) situated outside said hydraulic chamber;

a hollow external unit ( 23 ) assembled removably against said chamber wall ( 3 ) and on the outside of said chamber wall ( 3 ), said second zone ( 4 ) being formed inside the hollow external unit ( 23 );
sealing means ( 6 ) arranged around and against this control rod ( 5 ) to oppose the passage of fluid between the first and second zones ( 2 , 4 );
a guide piece ( 7 ) assembled removably with respect to the chamber wall ( 3 ), the sealing means ( 6 ) being assembled inside the guide piece ( 7 ) so as to allow relative movement of the rod ( 5 ) with respect to the guide piece ( 7 ) while at the same time achieving sealing between the said first and second zones ( 2 , 4 ); and
a bore ( 8 ) passing through the chamber wall ( 3 ) and extending between the first and second zones ( 2 , 4 ), the guide piece ( 7 ) being placed inside said bore ( 8 ) and coming into axial abutment against first axial-abutment means ( 9 ) that oppose the movement of the guide piece ( 7 ) towards the first zone ( 2 ),
wherein said bore ( 8 ) is configured to allow the guide piece ( 7 ) to be extracted from said bore ( 8 ), by a sliding of the guide piece ( 7 ) in the direction of the second zone ( 4 ), and
wherein part of the hollow external unit ( 23 ) extends facing the bore ( 8 ) so as to form a second axial-stop ( 24 ) arranged to prevent the guide piece ( 7 ) from being extracted from the bore ( 8 ).

2. The control system according to claim 1 , in which a seal ( 10 ) extends around the guide piece ( 7 ), between this guide piece ( 7 ) and an internal surface of the bore ( 8 ).

3. The control system according to claim 1 , in which the guide piece ( 7 ) has an external annular shoulder ( 12 ), the first axial-abutment means ( 9 ) which oppose the movement of the guide piece ( 7 ) towards the first zone ( 2 ) comprise a counterbore ( 13 ) formed at an end of the bore ( 8 ) of the chamber wall ( 3 ) that is positioned on the same side as the second zone ( 4 ), the external annular shoulder ( 12 ) bearing axially against this counterbore ( 13 ) of the chamber wall ( 3 ).

4. The control system according to claim 1 , in which the first axial-abutment means ( 9 ) comprise an elastic ring ( 14 ) extending in an annular groove ( 15 ) formed at the periphery of the bore ( 8 ) passing through the chamber wall ( 3 ), between the guide piece ( 7 ) and the first zone ( 2 ).

5. The control system according to claim 1 , in which the control rod ( 5 ) has a ball pivot ( 16 ) formed between terminal ends ( 5 a , 5 b ) of this control rod ( 5 ), and the guide piece ( 7 ) comprises a ball pivot seat ( 17 ) formed inside the guide piece ( 7 ) and against which the ball pivot ( 16 ) is positioned to allow the control rod ( 5 ) to pivot about a central point of the ball pivot and with respect to the ball pivot seat ( 17 ) which forms an annular support for the ball pivot ( 16 ).

6. The control system according to claim 5 , in which the ball pivot ( 16 ) has an annular surface forming a portion of a sphere and the rod ( 5 ) comprises a first portion ( 18 ) extending from the ball pivot ( 16 ) as far as the first zone ( 2 ) and a second portion ( 19 ) extending from the ball pivot ( 16 ) as far as the second zone ( 4 ), the first portion ( 18 ) being configured to control, from the first zone ( 2 ), the pivoting of the ball pivot ( 16 ) with respect to the ball pivot seat ( 17 ).

7. The control system according to claim 6 , in which the guide piece ( 7 ) has a counterbore ( 20 ) formed between the ball pivot seat ( 17 ) and the second zone ( 4 ), an annular retaining ring ( 21 ) is arranged inside this counterbore ( 20 ) in order to wedge the ball pivot ( 16 ) between the ball pivot seat ( 17 ) and this annular retaining ring ( 21 ).

8. The control system according to claim 7 , in which the sealing means ( 6 ) arranged around and against the control rod ( 5 ) to oppose the passage of fluid between the first and second zones ( 2 , 4 ) comprise an o-ring ( 22 ) surrounding the ball pivot and coming into radial contact with the ball pivot and with a planar internal annular surface of the counterbore made in the guide piece.

9. The control system according to claim 8 , in which the o-ring ( 22 ) has a thickness (e) smaller than a distance (d) formed axially between a planar internal annular surface of the counterbore ( 20 ) and the annular retaining ring ( 21 ) so that this o-ring ( 22 ) is clamped radially between the ball pivot ( 16 ) and the guide piece ( 7 ) and can move axially between the planar internal annular surface of the counterbore ( 20 ) and the annular retaining ring ( 21 ).

10. An aircraft landing gear actuator ( 25 ), comprising:
a control system ( 1 ) according to claim 1 ,
a hydraulic piston ( 26 ) mounted for sliding inside the first zone ( 2 ), a first part of the control rod extending in the first zone ( 2 ) so as to be able to be moved by the said piston ( 26 ), a second part of the control rod extending in the second zone ( 4 ) situated outside the said hydraulic chamber,
a metal component ( 27 ) being placed in this second zone ( 4 ) so that it can be moved therein by the control rod ( 5 ) according to the position of sliding of the said hydraulic piston ( 26 ),
the actuator ( 25 ) further comprising means for detecting the movement of the metal component ( 27 ) in the second zone ( 4 ).

11. The control system according to claim 6 , wherein said part of the hollow external unit ( 23 ) that extends facing the bore ( 8 ) also sits opposite the annular retaining ring ( 21 ) in order to prevent the extraction of the annular retaining ring ( 21 ) with respect to the counterbore ( 20 ) made in the guide piece ( 7 ).

12. A control system ( 1 ) comprising:
a control rod ( 5 ) extending between:
a first zone ( 2 ) situated in a hydraulic chamber delimited by a chamber wall ( 3 ); and
a second zone ( 4 ) situated outside the said hydraulic chamber;

a sealing means ( 6 ) arranged around and against this control rod ( 5 ) to oppose the passage of fluid between the first and second zones ( 2 , 4 ); and
a guide piece ( 7 ) assembled removably with respect to the chamber wall ( 3 ),
wherein the sealing means ( 6 ) is assembled inside the guide piece ( 7 ) so as to allow relative movement of the rod ( 5 ) with respect to the guide piece ( 7 ) while at the same time achieving sealing between the first and second zones ( 2 , 4 ),
wherein the control rod ( 5 ) has a ball pivot ( 16 ) formed between terminal ends ( 5 a , 5 b ) of the control rod ( 5 ), and the guide piece ( 7 ) comprises a ball pivot seat ( 17 ) formed inside the guide piece ( 7 ) and against which the ball pivot ( 16 ) is positioned to allow the control rod ( 5 ) to pivot about a central point of the ball pivot and with respect to the ball pivot seat ( 17 ) which forms an annular support for the ball pivot ( 16 ),
wherein the ball pivot ( 16 ) has an annular surface forming a portion of a sphere and the rod ( 5 ) comprises a first portion ( 18 ) extending from the ball pivot ( 16 ) as far as the first zone ( 2 ) and a second portion ( 19 ) extending from the ball pivot ( 16 ) as far as the second zone ( 4 ), the first portion ( 18 ) being configured to control, from the first zone ( 2 ), the pivoting of the ball pivot ( 16 ) with respect to the ball pivot seat ( 17 ),
wherein the guide piece ( 7 ) has a counterbore

Assignees

• Messier Bugatti Dowty

Inventors

• Ataman Gary

Classifications

• F16H51/00

  Levers of gearing mechanisms · CPC title

• F16J15/187

  Self-aligning stuffing-boxes · CPC title

• F16J15/50

  between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall · CPC title

• B64C25/22 Primary

  fluid · CPC title

• F15B15/2815

  Position sensing, i.e. means for continuous measurement of position, e.g. LVDT · CPC title