# US 7,611,003 B2 · Apparatus for braking counter shaft of transmission

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- Number: US 7,611,003 B2
- Document ID: US7611003B2
- Status: Granted
- Kind: B2
- Application number: 11/603,868
- Filed: 2006-11-22
- Published: 2008-03-27
- Granted: 2009-11-03
- Earliest claimed: 2006-09-21
- Assignees: Hyundai Motor Company
- Inventors: Chi Hwan Choi
- Web page: https://patentgrep.com/patent/US7611003B2

## CPC

- F16D 63/006: {Positive locking brakes}
- F16H 3/12: with means for synchronisation not incorporated in the clutches
- F16H 2003/123: {using a brake}
- Y10T 74/19637: with brake means for gearing
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16H: GEARING
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An apparatus for braking a counter shaft of a transmission, where the apparatus can cut off power delivery to the transmission and simultaneously reduce a rotation speed of the counter shaft for an easier gear shift. The apparatus includes: a transmission case; a counter shaft in the transmission case; a counter shaft brake that is engaged with the counter shaft and variably stops the counter shaft; and a counter shaft brake operating fork for operating the counter shaft brake.

## Claims

### Claim 1

An apparatus for braking a counter shaft of a transmission, comprising:
a transmission case;
the counter shaft in the transmission case;
a counter shaft brake that is engaged with the counter shaft and variably stops the counter shaft;
a counter shaft brake operating fork for operating the counter shaft brake;
a clutch release fork directly attached to the counter shaft brake operating fork;
a clutch release shaft for operating both the counter shaft brake operating fork and the clutch release fork at the same time so as to cut off power delivery to the transmission and simultaneously reduce a rotation speed of the counter shaft,
wherein the counter shaft comprises a side portion extending outward of the transmission case, and the counter shaft brake is engaged with the side portion of the counter shaft, and
wherein the counter shaft brake comprises a groove for guiding the counter shaft brake operating fork, and a friction member.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the counter shaft brake is splined with the counter shaft.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the counter shaft brake operating fork comprises a protruding portion that is inserted into the groove.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the friction member closely contacts the transmission case, whereby a rotation speed of the counter shaft is reduced when the counter shaft brake operating fork is operated.

### Claim 5 (depends on 4)

The apparatus of claim 4, wherein the counter shaft brake operating fork pushes the counter shaft brake toward the transmission case by an operation of the clutch release shaft.

### Claim 6 (depends on 1)

The apparatus of claim 1, further comprising an operation rod at an exterior of the transmission case, wherein the operation rod operates the clutch release shaft.

### Claim 7 (depends on 6)

The apparatus of claim 6, wherein the clutch release shaft is attached to the counter shaft brake operating fork.