Switchable rocker arm

Patent metadata

Field	Value
Publication number	US-10900385-B2
Application number	US-201916260769-A
Country	US
Kind code	B2
Filing date	Jan 29, 2019
Priority date	Jan 29, 2019
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

Abstract

A rocker arm includes an outer arm having a first wall surface, a second wall, and a third wall surface together forming a lock member channel. An inner arm selectively pivots relative to the outer arm about a pivot axis. A lost motion spring biases the inner arm to pivot relative to the outer arm in a first direction about the pivot axis. A lock member is located within the lock member channel which moves along a lock member axis between a coupled position which prevents the inner arm from pivoting about the pivot axis and a decoupled position which permits the inner arm to pivot relative to the outer arm. A lock member retainer is spaced apart from, and opposed to, the third wall surface such that the lock member is captured between the lock member retainer and the third wall surface.

First claim

I claim:

1. A rocker arm for transmitting rotational motion from a camshaft to opening and closing motion of a combustion valve in an internal combustion engine, said rocker arm comprising:
an outer arm having a first wall surface, a second wall surface opposed to, and spaced apart from, said first wall surface, and a third wall surface which joins said first wall surface to said second wall surface, said first wall surface, said second wall surface, and said third wall surface together forming a lock member channel which is open in a direction away from said third wall surface;
an inner arm which selectively pivots relative to said outer arm about a pivot axis;
a lost motion spring which biases said inner arm to pivot relative to said outer arm in a first direction about said pivot axis;
a lock member located within said lock member channel, wherein said lock member moves along a lock member axis between 1) a coupled position in which said lock member prevents said inner arm from pivoting about said pivot axis relative to said outer arm past a predetermined position of said inner arm relative to said outer arm in a second direction which is opposite of said first direction and 2) a decoupled position in which said lock member permits said inner arm to pivot relative to said outer arm past said predetermined position in said second direction about said pivot axis; and
a lock member retainer which is spaced apart from, and opposed to, said third wall surface such that said lock member is captured between said lock member retainer and said third wall surface, thereby limiting movement of said lock member away from said third wall surface in the direction away from said third wall surface which is perpendicular to said lock member axis
wherein said first wall surface, said second wall surface, and said third wall surface extend along a common portion of said lock member axis.

2. The rocker arm as in claim 1 , wherein:
said first wall surface is provided on a first wall which includes a first wall aperture;
said second wall surface is provided on a second wall which includes a second wall aperture; and
said lock member retainer is located within said first wall aperture and said second wall aperture.

3. The rocker arm as in claim 2 , wherein said first wall aperture and said second wall aperture each extend along a lock member retainer axis which is parallel to said pivot axis.

4. The rocker arm as in claim 2 , wherein said first wall aperture and said second wall aperture are each cylindrical.

5. The rocker arm as in claim 4 , wherein said lock member retainer is cylindrical.

6. The rocker arm as in claim 1 , wherein:
said first wall surface is planar; and
said second wall surface is planar and is parallel to said first wall surface.

7. The rocker arm as in claim 6 , wherein said lock member includes:
a first lock member surface which faces toward said first wall surface;
a second lock member surface which faces toward said second wall surface and which is parallel to said first lock member surface; and
a third lock member surface which joins said first lock member surface to said second lock member surface and which faces toward said third wall surface.

8. The rocker arm as in claim 7 , wherein;
said lock member includes a fourth lock member surface which faces toward said lock member retainer and which is laterally offset from said third lock member surface by a first distance;
said lock member includes a fifth lock member surface which is laterally offset from said third lock member surface by a second distance which is greater than said first distance, thereby forming a lock member shoulder which joins said fourth lock member surface and said fifth lock member surface; and
said lock member shoulder limits travel of said lock member by engaging said lock member retainer only when said lock member is in said coupled position.

9. The rocker arm as in claim 8 , wherein:
said third lock member surface is planar; and
said fourth lock member surface is planar and parallel to said third lock member surface.

10. The rocker arm as in claim 8 , wherein said lock member shoulder is perpendicular to said third lock member surface.

11. The rocker arm as in claim 7 , wherein:
said first lock member surface is planar; and
said second lock member surface is planar.

12. The rocker arm as in claim 1 , wherein said outer arm includes an outer arm first wall and an outer arm second wall such that said outer arm first wall and said outer arm second wall are spaced apart from each other, said outer arm first wall and said outer arm second wall having respective surfaces which define a central opening within which said inner arm is located.

13. The rocker arm as in claim 12 , wherein said respective surfaces of said outer arm first wall and said outer arm second wall are distinct from said first wall surface and said second wall surface.

14. A rocker arm for transmitting rotational motion from a camshaft to opening and closing motion of a combustion valve in an internal combustion engine, said rocker arm comprising:
an outer arm having a first wall surface, a second wall surface opposed to, and spaced apart from, said first wall surface, and a third wall surface which joins said first wall surface to said second wall surface, said first wall surface, said second wall surface, and said third wall surface together forming a lock member channel which is open in a direction away from said third wall surface;
an inner arm which selectively pivots relative to said outer arm about a pivot axis;
a lost motion spring which biases said inner arm to pivot relative to said outer arm in a first direction about said pivot axis;
a lock member located within said lock member channel, wherein said lock member moves along a lock member axis between 1) a coupled position in which said lock member prevents said inner arm from pivoting about said pivot axis relative to said outer arm past a predetermined position of said inner arm relative to said outer arm in a second direction which is opposite of said first direction and 2) a decoupled position in which said lock member permits said inner arm to pivot relative to said outer arm past said predetermined position in said second direction about said pivot axis; and
a lock member retainer which is spaced apart from, and opposed to, said third wall surface such that said lock member is captured between said lock member retainer and said third wall surface, thereby limiting movement of said lock member away from said third wall surface in the direction away from said third wall surface which is perpendicular to said lock member axis;
wherein said first wall surface is planar;
wherein said second wall surface is planar and is parallel to said first wall surface; and
wherein said lock member includes:
a first lock member surface which faces toward said first wall surface;
a second lock member surface which faces toward said second wall surface and which is parallel to said first lock member surface; and
a third lock member surface which joins said first lock member surface to said second lock member surface and which faces toward said third wall surface wherein said third lock member surface engages said third wall surface such that said third lock member surface slides across said third wall surface when said lock member moves between said coupled position and said decoupled position.

15. A rocker arm for transmitting rotational motion from a camshaft to opening and closing motion of a combustion valve in an internal combustion engine, said rocker arm comprising:
an outer a

Assignees

• Delphi Tech Ip Ltd

Inventors

• Uckermark Chad E

Classifications

• F01L2820/031

  Electromagnets · CPC title

• F01L13/0005

  Deactivating valves · CPC title

• F01L2001/186

  Split rocking arms, e.g. rocker arms having two articulated parts and means for varying the relative position of these parts or for selectively connecting the parts to move in unison · CPC title

• F01L2305/00

  Valve arrangements comprising rollers · CPC title

• F01L1/185 Primary

  Overhead end-pivot rocking arms · CPC title