Parking lock device

Patent metadata

Field	Value
Publication number	US-11713809-B2
Application number	US-202217655535-A
Country	US
Kind code	B2
Filing date	Mar 18, 2022
Priority date	Mar 23, 2021
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

A cam guiding device includes a cam guide having a cylindrical portion, a partially cylindrical portion extending from a leading end portion of the cylindrical portion, a partially tapered portion extending from the leading end portion of the cylindrical portion, and a rotation stopper portion provided on the partially cylindrical portion, and a sleeve for accommodating the cam guide. The sleeve includes an arc portion that overlaps the partially cylindrical portion from an outside. A radius of the partially tapered portion increases as the partially tapered portion extends away from the cylindrical portion. The rotation stopper portion is a component that protrudes radially outward from an outer circumferential surface of the partially cylindrical portion. When the rotation stopper portion abuts the sleeve and an inner circumferential surface of the cam guide abuts the parking cam, rotation of the cam guide with respect to the sleeve is restricted.

First claim

What is claimed is:

1. A parking lock device comprising:
a parking rod that has a base end portion rotatably coupled to a detent plate and a leading end portion located opposite to the base end portion;
a tapered parking cam disposed at the leading end portion of the parking rod and;
a cam guiding device that is configured to guide the tapered parking cam, wherein,
when the detent plate is rotated from a non-parking position to a parking position, the tapered parking cam moved together with the parking rod moves a parking lock pole rotatably disposed on a transmission case so that the parking lock pole engages with a parking lock gear rotated together with an output shaft of transmission,
the cam guiding device includes:
a cam guide including a cylindrical portion, a partially cylindrical portion extending from a leading end portion of the cylindrical portion, a partially tapered portion extending from the leading end portion of the cylindrical portion, and a rotation stopper portion provided on the partially cylindrical portion; and
a sleeve for accommodating the cam guide,

the sleeve includes an arc portion that overlaps the partially cylindrical portion from an outside,
a radius of the partially tapered portion increases as the partially tapered portion extends away from the cylindrical portion,
the rotation stopper portion is a component that protrudes radially outward from an outer circumferential surface of the partially cylindrical portion, and
when the rotation stopper portion abuts the sleeve and an inner circumferential surface of the cam guide abuts the tapered parking cam, rotation of the cam guide with respect to the sleeve is restricted.

2. The parking lock device according to claim 1 , wherein,
the rotation stopper portion includes a surface connected to the outer circumferential surface of the partially cylindrical portion, and
the surface of the rotation stopper portion extends linearly along a tangent line of the outer circumferential surface from a portion connected to the outer circumferential surface.

3. The parking lock device according to claim 2 , wherein,
a protrusion is arranged on the arc portion of the sleeve,
the protrusion and the arc portion are lined up in a circumferential direction of the arc portion, and
the surface of the rotation stopper portion is configured to abut the protrusion.

Assignees

• Toyota Motor Co Ltd

Inventors

• Nakamura Ryoto
• Kodama Takuya
• Teshima Atsushi

Classifications

• F16H63/3441 Primary

  Parking locks engaging axially · CPC title

• F16H63/3416 Primary

  Parking lock mechanisms or brakes in the transmission · CPC title

• F16H63/3433 Primary

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

• B60T1/062

  acting on transmission parts · CPC title

• F16H63/38

  Detents · CPC title