Swash plate angle sensor

Patent metadata

Field	Value
Publication number	US-10801492-B2
Application number	US-201616069230-A
Country	US
Kind code	B2
Filing date	Dec 7, 2016
Priority date	Jan 12, 2016
Publication date	Oct 13, 2020
Grant date	Oct 13, 2020

Abstract

The invention is directed to a swashplate angle sensor ( 10 ) for a variable displacement hydraulic unit ( 1 ). The hydraulic unit ( 1 ) comprising a housing ( 2 ), within which a swashplate ( 3 ) with a rod shaped feedback-link ( 12 ) fixedly attached to the swashplate ( 3 ) is arranged pivotable around a swashplate axis ( 7 ). The angle sensor ( 10 ) comprising a magnet ( 16 ) mounted rotatable on a magnet carrier ( 13 ), and a sensor ( 15 ) for sensing the orientation of the magnet ( 16 ). The magnet carrier ( 13 ) is located in a control block ( 14 ) attached to the housing ( 2 ) and is located parallel to the feedback-link ( 12 ). The magnet carrier ( 13 ) is rotatable around a sensor axis ( 18 ) being parallel to the swashplate axis ( 7 ). A linkage spring ( 11 ) provides a connection between the feedback-link ( 12 ) and the magnet carrier ( 13 ) such that a pivoting of the swashplate ( 3 ) with the feedback-link ( 12 ) causes a rotation of the magnet carrier ( 13 ).

First claim

What is claimed is:

1. A swashplate angle sensor for a variable displacement hydraulic unit comprising a pivot-able swashplate with a rod shaped feedback-link attached thereon, the angle sensor comprising a magnet mounted on a magnet carrier rotatable around a sensor axis, and a sensor for sensing the orientation of the magnet, wherein
the angle sensor comprises a linkage element providing a mechanical linkage between the feedback-link and the magnet carrier such that a pivoting of the swashplate moves the linkage element via the feedback-link and causes a rotation of the magnet carrier.

2. The swashplate angle sensor of claim 1 , wherein the linkage element comprises a spring with a U-shaped elongated hole-section surrounding the feedback-link in a tight slide-able contact therewith, and with two legs, the ends of which are coupled to the magnet carrier.

3. The swashplate angle sensor of claim 2 , wherein the length of the elongated hole-section of the linkage element is greater than the adjoining diameter of the feedback-link.

4. The swashplate angle sensor of claim 3 , wherein the ends of the linkage element protruding from the magnet carrier are bent at an angle, wherein the angle is greater than or equal to 90°.

5. The swashplate angle sensor of claim 3 , wherein the linkage element is a linkage spring of torsional type with a rectangular, round or oval cross-section.

6. The swashplate angle sensor of claim 3 , wherein the ends of the linkage element are in slide-able contact with an inner wall of the control block.

7. The swashplate angle sensor of claim 2 , wherein the ends of the linkage element protruding from the magnet carrier are bent at an angle, wherein the angle is greater than or equal to 90°.

8. The swashplate angle sensor of claim 2 , wherein the linkage element is a linkage spring of torsional type with a rectangular, round or oval cross-section.

9. The swashplate angle sensor of claim 2 , wherein the ends of the linkage element are in slide-able contact with an inner wall of the control block.

10. The swashplate angle sensor of claim 1 , wherein the linkage element comprises an elongated hole-section surrounding the feedback-link in a tight slide-able contact therewith, and an adjoining leg, the end of which is coupled to the magnet carrier.

11. The swashplate angle sensor of claim 10 , wherein the length of the elongated hole-section of the linkage element is greater than the adjoining diameter of the feedback-link.

12. The swashplate angle sensor of claim 1 , wherein the ends of the linkage element protruding from the magnet carrier are bent at an angle, wherein the angle is greater than or equal to 90°.

13. The swashplate angle sensor of claim 12 , wherein the linkage element is a linkage spring of torsional type with a rectangular, round or oval cross-section.

14. The swashplate angle sensor of claim 12 , wherein the ends of the linkage element are in slide-able contact with an inner wall of the control block.

15. The swashplate angle sensor of claim 1 , wherein the linkage element is a linkage spring of torsional type with a rectangular, round or oval cross-section.

16. The swashplate angle sensor of claim 15 , wherein the ends of the linkage element are in slide-able contact with an inner wall of the control block.

17. The swashplate angle sensor of claim 1 , wherein the ends of the linkage element are in slide-able contact with an inner wall of the control block.

18. The swashplate angle sensor of claim 1 , wherein the sensor axis and/or the longitudinal axis of the magnet carrier is parallel to the longitudinal axis of feedback-link and/or to the swashplate pivot axis.

19. The swashplate angle sensor of claim 1 , wherein the magnet carrier is situated in a housing or in a control block of the hydraulic unit.

20. A control block of a variable displacement hydraulic unit comprising a swashplate angle sensor suitable to be fixed on a housing of the variable displacement hydraulic unit and suitable to be coupled to a feedback link of the variable displacement hydraulic unit, the variable displacement hydraulic unit comprising a pivot-able swashplate with a rod shaped feedback-link attached thereon, the swashplate angle sensor comprising a magnet mounted on a magnet carrier rotatable around a sensor axis, and a sensor for sensing the orientation of the magnet, wherein
the swashplate angle sensor comprises a linkage element providing a mechanical linkage between the feedback-link and the magnet carrier such that a pivoting of the swashplate moves the linkage element via the feedback-link and causes a rotation of the magnet carrier.

Assignees

• Danfoss Power Solutions Gmbh & Co Ohg
• Danfoss Power Solutions G M B H & Co Ohg

Inventors

• Bahna Peter
• Marsch Suenje
• Laffrenzen Heiko

Classifications

• F04B1/324

  by changing the inclination of the swash plate · CPC title

• G01D5/145

  influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06) · CPC title

• F04B51/00 Primary

  Testing machines, pumps, or pumping installations · CPC title

• F04B2201/12051

  Angular position · CPC title

• F04B1/146 Primary

  Swash plates; Actuating elements · CPC title