Device for shifting changes in the transmission ratio

• US 8,464,600 B2
• Filed: 12/08/2005
• Issued: 06/18/2013
• Est. Priority Date: 12/17/2004
• Status: Active Grant

• Current Assignee: Audi AG (Volkswagen AG)
• Original Assignee: Audi AG (Volkswagen AG)
• Inventors: Maerkl, Johann
• Primary Examiner(s): Ridley, Richard W
• Assistant Examiner(s): Rogers, Adam D
• Application Number:
  US11/793,216
• Publication Number:
  US 20080092686A1
• Time in Patent Office: 2,749 Days
• Field of Search: 744/731, 744/731.2, 744/733.6, 744/733.7, 744/733, 743/35, 335/207, 735/143.8, 338/32.R, 324/207.24, 324/207.26
• US Class Current: 74/473.12
• 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. The device comprises at least one axially movable and/or rotabale 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 detecting a shifting of the transmission ratio of a transmission of a motor vehicle, comprising:

a first member supportable on said transmission, mechanically connectable to a shifting component of said transmission, displaceable along a rectilinear line of travel, having a slot disposed along said rectilinear line of travel providing a pair of spaced segments;

wherein one of said pair of spaced segments includes at least one magnetized region providing a magnetic field; and

a second member fixedly supported on a housing of said transmission and having a portion thereof projecting into said slot of said first member subjected to said magnetic field when said at least one magnetized region is displaced along said rectilinear line of travel within an excitation proximity of said projecting portion.

2. The device according to claim 1 including a pair of said magnetized regions disposed on at least one of said pair of spaced segments of said first member, and on opposite sides of said projecting portion of said second member.

3. The device according to claim 2 wherein one of said pair of said magnetized regions is disposed on one of said pair of spaced segments of said first member and the other of said pair of magnetized regions is disposed on the other of said pair of spaced segments.

4. The device according to claim 1 wherein said second member comprises an electrical coil functional to react with said magnetic field when within the excitation proximity therewith to generate a signal indicating a position of said first member.