Parking device

Patent metadata

Field	Value
Publication number	US-9702421-B2
Application number	US-201414891766-A
Country	US
Kind code	B2
Filing date	Jun 17, 2014
Priority date	Jun 17, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A hydraulic unit and an electromagnetic unit are disposed in directions that are orthogonal to each other. In addition, in a parking locked state, a roller of a pin of a piston rod and a lower abutment surface of a distal end portion of a solenoid shaft are in abutment with each other. Further, when a coil is not energized, the solenoid shaft is allowed to be moved rightward in the drawing through abutment between the pin of the piston rod and the distal end portion of the solenoid shaft during movement of the piston rod.

First claim

The invention claimed is:

1. A parking device mounted on a vehicle to establish a parking locked state and a parking unlocked state, comprising:
a hydraulic unit that includes a first shaft member that is movable in a first direction, a first elastic member that urges the first shaft member toward a lock side on which the parking locked state is established, in the first direction, using an elastic force, and a hydraulic pressure generation portion that moves the first shaft member toward an unlock side which is opposite to the lock side, in the first direction, using a hydraulic pressure against the elastic force of the first elastic member; and
an electromagnetic unit that includes a second shaft member that is movable in a second direction which is orthogonal to the first direction, a second elastic member that urges the second shaft member toward the first shaft member, in the second direction, using an elastic force, and a magnetic force holding portion that can hold the second shaft member on a side of the first shaft member using a magnetic force, wherein:
the first shaft member is provided with an abutment portion that can abut against a distal end portion of the second shaft member;
a lock side surface of the distal end portion of the second shaft member on the lock side is formed to be inclined toward the lock side from a distal end side toward a base end side of the second shaft member,
the lock side surface of the second shaft member is formed as a curved surface that is convex toward the lock side, and
an unlock side surface of the distal end portion of the second shaft member on the unlock side is formed to be inclined toward the unlock side at a constant angle from a distal end side toward a base end side of the second shaft member.

2. The parking device according to claim 1 , wherein
the second shaft member of the electromagnetic unit is moved away from the first shaft member, when the parking locked state is established and the abutment portion of the first shaft member is in abutment with the lock side surface of the second shaft member, compared to when the abutment portion of the first shaft member is not in abutment with the distal end portion of the second shaft member.

3. The parking device according to claim 2 , wherein
the lock side surface of the second shaft member is formed as a curved surface that is convex toward the lock side.

4. The parking device according to claim 3 , wherein:
the abutment portion of the first shaft member is formed in a cylindrical shape; and
the lock side surface of the second shaft member is formed as a curved surface with a radius of curvature that is smaller than a radius of curvature of the abutment portion of the first shaft member.

5. The parking device according to claim 4 , wherein
an unlock side surface of the distal end portion of the second shaft member on the unlock side is formed to be inclined toward the unlock side at a constant angle from a distal end side toward a base end side of the second shaft member.

6. The parking device according to claim 5 , wherein:
the magnetic force holding portion is capable of holding the second shaft member on the first shaft member side using the magnetic force when a coil is energized; and
the electromagnetic unit is configured to allow the second shaft member to be moved away from the first shaft member, in the second direction, by a force applied from the abutment portion of the first shaft member to the distal end portion of the second shaft member during movement of the first shaft member when the coil is not energized.

7. The parking device according to claim 6 , wherein:
the magnetic force holding portion is a permanent magnet that holds the second shaft member on the first shaft member side using the magnetic force; and
the electromagnetic unit is configured to release holding of the second shaft member by the permanent magnet and allow the second shaft member to be moved away from the first shaft member, in the second direction, by a force applied from the abutment portion of the first shaft member to the distal end portion of the second shaft member during movement of the first shaft member when the coil is energized.

8. The parking device according to claim 1 , wherein:
the magnetic force holding portion is capable of holding the second shaft member on the first shaft member side using the magnetic force when a coil is energized; and
the electromagnetic unit is configured to allow the second shaft member to be moved away from the first shaft member, in the second direction, by a force applied from the abutment portion of the first shaft member to the distal end portion of the second shaft member during movement of the first shaft member when the coil is not energized.

9. The parking device according to claim 1 , wherein:
the magnetic force holding portion is a permanent magnet that holds the second shaft member on the first shaft member side using the magnetic force; and
the electromagnetic unit is configured to release holding of the second shaft member by the permanent magnet and allow the second shaft member to be moved away from the first shaft member, in the second direction, by a force applied from the abutment portion of the first shaft member to the distal end portion of the second shaft member during movement of the first shaft member when the coil is energized.

10. The parking device according to claim 1 , wherein the first shaft member is formed with a hole portion into which the distal end portion of the second shaft member is advanceable and which penetrates through the first shaft member.

11. The parking device according to claim 1 , wherein the electromagnetic unit further includes a bearing member that is fixed to the magnetic force holding portion, and the bearing member slidably supports the second shaft member in the second direction.

12. The parking device according to claim 1 , wherein the abutment portion of the first shaft member is configured not to abut against the distal end portion of the second shaft member when the first shaft member establishes the parking locked state or the parking unlocked state.

13. The parking device according to claim 1 , further comprising: a detent lever that is coupled with a parking rod that urges a parking pawl engaged with a parking gear, and a case that slidably supports the first shaft member in the first direction,
the first shaft member is formed by a piston that forms the hydraulic pressure generation portion together with a case, and a piston rod of which one end portion is fixed to the piston and the other end portion is coupled with the detent lever, and
wherein a hole portion is provided in the piston rod.

Assignees

• Aisin Aw Co

Inventors

• Iwata Akihito
• Takei Tadamasa
• Naka Kenichi

Classifications

• F16D2121/20

  using electromagnets · CPC title

• B60T1/06

  acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission {or on double wheels} · CPC title

• F16H63/3416

  Parking lock mechanisms or brakes in the transmission · CPC title

• B60T1/005

  by locking of wheel or transmission rotation · CPC title

• F16H63/34

  Locking or disabling mechanisms · CPC title