Axially-limited guide device, parking mechanism, and automobile

Patent metadata

Field	Value
Publication number	US-12092211-B2
Application number	US-202318349978-A
Country	US
Kind code	B2
Filing date	Jul 11, 2023
Priority date	Feb 23, 2021
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

Provided is an axially-limited guide device applied in a parking mechanism. The parking mechanism includes a parking pawl and a parking shift fork that is axially movable. The guide device includes a parking bracket assembly and a guide block. The guide block is configured to be slidably engaged with an execution member at an end of the parking shift fork to allow for a relative rotation of the parking pawl and a rotary shaft. The parking bracket assembly is configured to axially limit the parking pawl and guide the parking shift fork. The parking bracket assembly includes a limiting portion abutting against the guide block. The limiting portion is configured to limit an axial movement of the guide block when the execution member at the end of the parking shift fork is axially disengaged from the guide block. Also provided are a parking mechanism and an automobile.

First claim

What is claimed is:

1. An axially-limited guide device, applied in a parking mechanism comprising a parking pawl and a parking shift fork that is axially movable, the axially-limited guide device comprising:
a parking bracket assembly configured to axially limit the parking pawl and guide the parking shift fork; and
a guide block configured to be slidably engaged with an execution member at an end of the parking shift fork to allow for a relative rotation of the parking pawl and a rotary shaft, wherein:
the parking bracket assembly comprises a limiting portion abutting against the guide block, the limiting portion being configured to limit an axial movement of the guide block when the execution member at the end of the parking shift fork is axially disengaged from the guide block.

2. The axially-limited guide device according to claim 1 , wherein the guide block comprises a first guide portion having a support surface, the limiting portion being in contact with the support surface.

3. The axially-limited guide device according to claim 2 , wherein an end of the limiting portion has a forced surface matching with the support surface.

4. The axially-limited guide device according to claim 3 , wherein:
the first guide portion has a first guide surface; and
a projection of the limiting portion on a radial plane of the guide block has no overlap with a projection of the first guide surface on the radial plane of the guide block.

5. The axially-limited guide device according to claim 4 , wherein:
the first guide surface is of a sector-ring shape; and
a straight line where one of side edges of the forced surface is located is tangent to an outer ring of the first guide surface.

6. The axially-limited guide device according to claim 5 , wherein the forced surface has a width greater than or equal to a difference between an outer are radius and an inner are radius of the first guide surface.

7. The axially-limited guide device according to claim 5 , wherein the limiting portion has a third guide surface perpendicular to the forced surface, the third guide surface being configured to guide an axial sliding of the execution member.

8. The axially-limited guide device according to claim 1 , wherein:
the guide block comprises a second guide portion having a second guide surface; and
a projection of the limiting portion on a radial plane of the guide block has no overlap with a projection of the second guide surface on the radial plane of the guide block.

9. The axially-limited guide device according to claim 1 , wherein the limiting portion has a sector-ring-shaped longitudinal cross section.

10. The axially-limited guide device according to claim 1 , wherein:
the parking bracket assembly further comprises a parking bracket; and
the parking bracket assembly comprising the limiting portion and the parking bracket is integrally formed.

11. The axially-limited guide device according to claim 1 , wherein the parking bracket assembly further comprises a parking bracket connected to the limiting portion by welding.

12. A parking mechanism, comprising:
a housing:
a rotary shaft;
a parking pawl;
a parking shift fork; and
an axially-limited guide device, comprising:
a parking bracket assembly configured to axially limit the parking pawl and guide the parking shift fork; and
a guide block configured to be slidably engaged with an execution member at an end of the parking shift fork to allow for a relative rotation of the parking pawl and the rotary shaft, wherein:
the parking bracket assembly comprises a limiting portion abutting against the guide block, the limiting portion being configured to limit an axial movement of the guide block when the execution member at the end of the parking shift fork is axially disengaged from the guide block;
a parking bracket is fixedly connected to the housing by means of a bolt and two positioning pins and has a rotary shaft fitting hole;
the parking pawl, the parking bracket, and the parking shift fork are sequentially sleeved over the rotary shaft;
a parking torsion spring is disposed between the parking pawl and the rotary shaft and configured to reset the parking pawl;
the execution member is disposed at the end of the parking shift fork; and
the parking shift fork is engaged with the guide block by the execution member to allow for a slidable connection between the guide block and the parking pawl.

13. The parking mechanism according to claim 12 , wherein:
an anti-rotation pin slot is defined on the parking bracket; and
an anti-rotation pin is disposed on the parking shift fork and slidably connected to the anti-rotation pin slot.

14. The parking mechanism according to claim 12 , wherein a guide block fitting hole is defined on the housing, the guide block being press-fitted in the guide block fitting hole through an interference fit.

15. The parking mechanism according to claim 12 , wherein the guide block comprises a first guide portion having a support surface, the limiting portion being in contact with the support surface.

16. The parking mechanism according to claim 15 , wherein an end of the limiting portion has a forced surface matching with the support surface.

17. The parking mechanism according to claim 16 , wherein:
the first guide portion has a first guide surface; and
a projection of the limiting portion on a radial plane of the guide block has no overlap with a projection of the first guide surface on the radial plane of the guide block.

18. The parking mechanism according to claim 17 , wherein:
the first guide surface is of a sector-ring shape; and
a straight line where one of side edges of the forced surface is located is tangent to an outer ring of the first guide surface.

19. The parking mechanism according to claim 12 , wherein:
the guide block comprises a second guide portion having a second guide surface; and
a projection of the limiting portion on a radial plane of the guide block has no overlap with a projection of the second guide surface on the radial plane of the guide block.

20. An automobile, comprising the parking mechanism according to claim 12 .

Assignees

• Geely Holding Group Co Ltd
• Geely Changxing Automatic Trans Co Ltd
• Zhejiang Geely Power Assembly Co Ltd
• Ningbo Geely Royal Engine Components Co Ltd
• Ningbo Umd Automatic Transmission Co Ltd

Inventors

• Zou chaoyang
• Yu Chuang
• Tan Yanjun
• Lin Xiaozhe
• Wang Ruiping
• An Conghui

Classifications

• F16H63/3425

  characterised by pawls or wheels · CPC title

• F16H63/3433 Primary

  Details of latch mechanisms, e.g. for keeping pawls out of engagement · CPC title

• F16H63/3416 Primary

  Parking lock mechanisms or brakes in the transmission · CPC title