# US 9,518,656 B2 · Vehicle and a locking assembly for the vehicle

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- Number: US 9,518,656 B2
- Document ID: US9518656B2
- Status: Granted
- Kind: B2
- Application number: 14/477,197
- Filed: 2014-09-04
- Published: 2015-06-11
- Granted: 2016-12-13
- Earliest claimed: 2013-12-06
- Assignees: GM Global Technology Operations LLC
- Applicants: GM Global Technology Operations LLC
- Inventors: Gary R. Valler; Shawn H. Swales; Scott Vaubel; Anthony J. Corsetti; Arthur L. McGrew, Jr.; Goro Tamai
- Web page: https://patentgrep.com/patent/US9518656B2

## CPC

- F16H 63/3425: {characterised by pawls or wheels}
- F16H 63/3416: {Parking lock mechanisms or brakes in the transmission}
- F16H: GEARING

## Abstract

A vehicle and a locking assembly are disclosed. The locking assembly includes a pawl rotatable about a pivot axis between an engaged position and a disengaged position. The pawl is adapted to engage the ring gear when in the engaged position for preventing movement of the ring gear. The locking assembly further includes an actuator selectively actuated to move the pawl to the engaged position. Additionally, the locking assembly includes a biasing mechanism engaging the pawl to continuously bias the pawl toward the disengaged position. The pawl includes a first tooth and a second tooth spaced from each other to define a gap therebetween. The first tooth and the second tooth are adapted to trap a tooth of the ring gear in the gap when the pawl is in the engaged position for preventing rotation of the ring gear.

## Claims

### Claim 1

A locking assembly for a ring gear operatively connected to a crankshaft, the assembly comprising:
a pawl rotatable about a pivot axis between an engaged position and a disengaged position, with the pawl adapted to engage the ring gear when in the engaged position for preventing movement of the ring gear, wherein the pawl includes a first pawl segment and a second pawl segment each rotatable about the pivot axis;
an actuator selectively actuated to move the pawl to the engaged position;
a biasing mechanism engaging the pawl to continuously bias the pawl toward the disengaged position; and
wherein the pawl includes a first tooth and a second tooth spaced from each other to define a gap therebetween, with the first tooth and the second tooth adapted to trap a tooth of the ring gear in the gap when the pawl is in the engaged position for preventing rotation of the ring gear.

### Claim 2 (depends on 1)

An assembly as set forth in claim 1 wherein:
the actuator includes an extension having a distal end engaging the pawl, with the extension and the distal end rotatable about a first axis; and
the distal end includes a roller engaging the pawl and rotatable along the pawl as the extension rotates about the first axis.

### Claim 3 (depends on 1)

An assembly as set forth in claim 1 wherein the actuator includes an extension having a distal end engaging the pawl, with the extension and the distal end movable along a first axis.

### Claim 4 (depends on 1)

An assembly as set forth in claim 1 wherein the first pawl segment includes a first leg and a second leg spaced from each other with the second pawl segment disposed between the first and second legs.

### Claim 5 (depends on 4)

An assembly as set forth in claim 4 wherein the first and second pawl segments each include a first end and a second end spaced from each other, with the first tooth extending from the first end of the first pawl segment and the second tooth extending from the first end of the second pawl segment, and wherein the first tooth and the second tooth align with each other in a spaced relationship.

### Claim 6 (depends on 4)

An assembly as set forth in claim 4 wherein:
the biasing mechanism includes a member and a spring, with the spring engaging the pawl and the member to continuously bias the pawl to the disengaged position and into continuous engagement with the actuator; and
the spring defines a plurality of slits spaced from each other to split the spring into a first biasing arm engaging the first leg of the first pawl segment, a second biasing arm engaging the second leg of the first pawl segment and a third biasing arm engaging the second pawl segment.

### Claim 7 (depends on 1)

An assembly as set forth in claim 1 wherein the biasing mechanism includes a spring engaging the pawl to continuously bias the pawl to the disengaged position and into continuous engagement with the actuator.

### Claim 8 (depends on 7)

An assembly as set forth in claim 7 wherein:
the biasing mechanism further includes a member; and
the spring includes a first portion, a second portion and a third portion disposed between the first and second portions, with the first portion engaging the pawl and the third portion engaging the member.

### Claim 9 (depends on 8)

An assembly as set forth in claim 8 wherein:
the first portion of the spring defines a plurality of slits spaced from each other to split the first portion into a first biasing arm, a second biasing arm and a third biasing arm, with the third biasing arm disposed between the first and second biasing arms;
the pawl includes a first pawl segment and a second pawl segment each rotatable about the pivot axis, with the first pawl segment including a first leg and a second leg spaced from each other with the second pawl segment disposed between the first and second legs; and
the first biasing arm engages the first leg of the first pawl segment, the second biasing arm engages the second leg of the first pawl segment and the third biasing arm engages the second pawl segment.

### Claim 10 (depends on 1)

An assembly as set forth in claim 1 wherein:
the pawl includes an outer side facing the actuator and an inner side opposing the outer side;
the first tooth and the second tooth each extend outwardly from the inner side away from the outer side; and the first tooth and the second tooth align with each other in a spaced relationship along the inner side.

### Claim 11 (depends on 10)

An assembly as set forth in claim 10 wherein:
the pawl includes a first pawl segment and a second pawl segment each rotatable about the pivot axis, with the first and second pawl segments each including the outer and inner sides such that the first tooth extends from the inner side of the first pawl segment and the second tooth extends from the inner side of the second pawl segment, and the first pawl segment includes a first leg and a second leg spaced from each other with the second pawl segment disposed between the first and second legs; and
the first and second pawl segments each include a first end and a second end spaced from each other, with the first tooth extending from the first end of the first pawl segment and the second tooth extending from the first end of the second pawl segment, and the biasing mechanism engages the second end of both of the first and second pawl segments.

### Claim 12 (depends on 11)

An assembly as set forth in claim 11 wherein the biasing mechanism includes a spring and a dowel pin, with the dowel pin attached to the second pawl segment and engaging the spring to position the spring relative to the first and second pawl segments.

### Claim 13

A vehicle comprising:
a ring gear selectively rotatable about a longitudinal axis and including a plurality of teeth spaced from each other radially about the longitudinal axis;
a locking assembly including a pawl rotatable about a pivot axis between an engaged position engaging the ring gear to prevent rotation of the ring gear and a disengaged position spaced from the ring gear to allow rotation of the ring gear; and
wherein the pawl includes a first tooth and a second tooth spaced from each other to define a gap therebetween such that one of the teeth of the ring gear is trapped in the gap between the first tooth and the second tooth to prevent rotation of the ring gear when the pawl is in the engaged position;
wherein the pawl includes separate pawl segments each rotatable about the pivot axis, with the first tooth extending from one of the pawl segments and the second tooth extending from another one of the pawl segments.

### Claim 14 (depends on 13)

A vehicle as set forth in claim 13 wherein the second tooth includes a front side and a back side opposing each other, the back side of the second tooth is orientated at an angle relative to a plane that is perpendicular to the longitudinal axis such that rotation of the ring gear causes one of the teeth of the ring gear to engage the back side of the second tooth to move the second tooth toward the disengaged position when a predetermined force is applied to the back side of the second tooth.

### Claim 15 (depends on 13)

A vehicle as set forth in claim 13 wherein:
each of the teeth of the ring gear face outwardly away from the longitudinal axis,
the first tooth and the second tooth each face toward the ring gear such that the first tooth and the second tooth selectively trap one of the teeth of the ring gear in the gap;
the ring gear includes a first side and a second side spaced from each other to present a first width of the ring gear, with the teeth of the ring gear disposed between the first and second sides; and
the pawl includes a first side edge and a second side edge spaced from each other to present a second width substantially equal to or less than the first width.

### Claim 16 (depends on 15)

A vehicle as set forth in claim 15 wherein:
the locking assembly includes an actuator selectively actuated to move the pawl to the engaged position;
the locking assembly includes a biasing mechanism engaging the pawl to continuously bias the pawl toward the disengaged position; and
the first tooth and the second tooth align with each other in a spaced relationship.

### Claim 17 (depends on 16)

A vehicle as set forth in claim 16:
further including an engine block having a crankshaft disposed therein, with the crankshaft rotatable about the longitudinal axis and the ring gear disposed outside of the engine block, and with the ring gear operatively connected to the crankshaft such that the ring gear and the crankshaft rotatable in unison about the longitudinal axis when the pawl is in the disengaged position, and the ring gear and the crankshaft remain substantially stationary when the pawl is in the engaged position; and
further including a transmission housing attached to the engine block, with the transmission housing having a first support and a second support spaced from each other, with the pawl rotatable attached to the first and second supports.

### Claim 18 (depends on 17)

A vehicle as set forth in claim 17 wherein the actuator includes an extension having a distal end engaging the pawl, and the actuator includes a motor and gearing operatively connected to each other and disposed outside of the transmission housing, and the actuator includes a shaft operatively connected to the gearing, the motor and the extension to rotate the extension and the distal end about a first axis.

### Claim 19 (depends on 17)

A vehicle as set forth in claim 17 wherein:
the biasing mechanism includes a member and a spring, with the spring engaging the pawl and the member to continuously bias the pawl to the disengaged position and into continuous engagement with the actuator; and
the spring includes a first portion, a second portion and a third portion disposed between the first and second portions, with the first portion engaging the pawl, the second portion engaging the transmission housing and the third portion engaging the member.

### Claim 20

A vehicle comprising:
a ring gear selectively rotatable about a longitudinal axis and including a plurality of teeth spaced from each other radially about the longitudinal axis;
a locking assembly including a pawl rotatable about a pivot axis between an engaged position engaging the ring gear to prevent rotation of the ring gear and a disengaged position spaced from the ring gear to allow rotation of the ring gear;
wherein the pawl includes a first tooth and a second tooth spaced from each other to define a gap therebetween such that one of the teeth of the ring gear is trapped in the gap between the first tooth and the second tooth to prevent rotation of the ring gear when the pawl is in the engaged position;
further including an engine housing the crankshaft;
further including a first clutch operatively connected to the crankshaft and disposed downstream to the engine;
wherein the ring gear and the locking assembly are disposed downstream to the first clutch;
further including an input member of a transmission operatively connected to the crankshaft; and
further including a damper operatively connected to the input member and disposed downstream to the locking assembly.