Device For Shifting Changes In The Transmission Ratio

• US 20080092686A1
• Filed: 12/08/2005
• Published: 04/24/2008
• Est. Priority Date: 12/17/2004
• Status: Active Grant

• Current Assignee: Audi AG (Volkswagen AG)
• Original Assignee: Audi AG (Volkswagen AG)
• Inventors: Markl, Johann
• Granted Patent: US 8,464,600 B2
• Time in Patent Office: Days
• US Class Current: 74/470
• CPC Class Codes: F16H 59/70 dependent on the ratio established
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06
• CPC Class Codes: Y10T 74/20006 Resilient connections
• CPC Class Codes: Y10T 74/2003 Electrical actuator
• CPC Class Codes: Y10T 74/2014 Manually operated selector [e.g., remotely controlled device, lever, push button, rotary dial, etc.]
• CPC Class Codes: Y10T 74/20177 Particular element [e.g., shift fork, template, etc.]

Abstract

The invention relates to a device for shifting changes in the transmission ratio of a vehicle transmission. Said device comprises at least one axially movable and/or rotatable shifting element and an electrical position identification of the shifting element. At least one magnet which generates position signals in combination with a stationary sensor is disposed on the shifting element. In order to create a device that is advantageous regarding production and design, the magnet is formed directly by a magnetic area on the shifting element.

Claims

1. A device for shifting changes in a transmission ratio in transmissions for motor vehicles comprising at least one axially movable and/or rotatable shifting element and with electrical position detection of the shifting element, the shifting element comprising at least one magnet which in conjunction with a stationary sensor generates position signals, wherein at least one magnet is formed directly by a magnetized region on the shifting element.

2. The device according to claim 1, wherein the shifting element in the magnetized region is made such that a magnetic field similar to one or more permanent magnets is achieved.

3. The device according to claim 2, wherein the cross section of the shifting element in the magnetized region is essentially square.

4. The device according to claim 1, wherein the shifting element is rod-shaped and is provided at least in the magnetized region with a tapered section.

6. The device according to claim 1, wherein at least in the magnetized region of the shifting element a slot-like recess is provided therein.

7. The device according to claim 6, wherein the shifting element comprises legs formed on either side of the recess, wherein one of the legs, to which the stationary sensor is adjacent, is magnetized.

8. The device according to claim 6, wherein the shifting element comprises legs which legs are formed on either side of the recess and are magnetized and wherein the stationary sensor projects into the recess.

9. The device according to claim 1, comprising several magnetized regions and/or several sensors on the shifting element.

10. The device according to claim 1, wherein the shifting element is an axially movable selector rail with essentially a rectangular cross section.

11. The device according to claim 10, wherein at least in the magnetized region of the shifting element a slot-like recess is provided therein, and the recesses provided at least in the magnetized region on the selector rail are produced by punching.

12. The device according to claim 10, wherein the shifting element is rod-shaped and is provided at least in the magnetized region with a tapered section, and the recesses provided at least in the magnetized region on the selector rail are produced by punching.

5. The device according to claim 5, wherein the tapered section is formed by a unilateral or by bilateral recesses on the shifting element.

13. A device for shifting changes in a transmission ratio in a transmission system of a motor vehicles, the device comprising:

a selector shaft, the shaft comprising at least one magnet in the form of a magnetized region of the shaft; and

at least one stationary electrical coil positioned as to generate a position signal of the selector shaft.

14. The device of claim 13, wherein the shaft has an essentially square cross-section.

15. The device of claim 13, wherein the magnetized region of the shaft is tapered.

16. The device of claim 13, wherein the magnetized region comprises a slot-like recess.