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Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof

Imported: 24 Feb '17 | Published: 06 Jan '04

Kiyoshi Okubo, Shoichi Abe, Satoshi Kadokawa, Hiroshi Iwasa

USPTO - Utility Patents

Abstract

A sheet metal rocker arm manufactured by the steps of punching one metal plate to form a blank having a predetermined contour and through holes, and subjecting this blank to a bending work based on a press work to form a pair of side walls parallel to each other and a connecting portion for connecting the both ends of the side walls in the width direction thereof. This rocker arm is also provided with at least a pair of though holes formed at positions which are aligned with each other on the both side walls and at least one engagement portion provided in a part of the connecting portion. The thickness of at least one engagement portion, is formed to be greater than the thickness of the both side walls.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a sheet metal rocker arm according to a first embodiment of the present invention.

FIG. 2A is a plan view of the sheet metal rocker arm of the first embodiment, FIG. 2B is a cross-sectional view taken along a—a in FIG. 2A, FIG. 2C is a cross-sectional view taken along b—b in FIG. 2A, and FIG. 2D is a cross-sectional view taken along c—c in FIG.

2A.

FIGS. 3A to

3D show a first blank obtained by a first step when the sheet metal rocker arm is manufactured, in which FIG. 3A is a plan view of the first blank, FIG. 3B is a cross-sectional view taken along a—a in FIG. 3A, FIG. 3C is a cross-sectional view taken along b—b in FIG. 3A, and FIG. 3D is a cross-sectional view taken along c—c in FIG.

3A.

FIGS. 4A to

4D show a second blank obtained by a second step in the same manner, in which FIG. 4A is a plan view of the second blank, FIG. 4B is a cross-sectional view taken along a—a in FIG. 4A, FIG. 4C is a cross-sectional view taken along b—b in FIG. 4A, and FIG. 4D is a cross-sectional view taken along c—c in FIG.

4C.

FIGS. 5A to

5D show a first intermediate blank obtained by a third step in the same manner, in which FIG. 5A is a plan view of the first intermediate blank, FIG. 5B is a cross-sectional view taken along a—a in FIG. 5A, FIG. 5C is a cross-sectional view taken along b—b in FIG. 5A, and FIG. 5D is a cross-sectional view taken along c—c in FIG.

5D.

FIGS. 6A to

6D show a second intermediate blank obtained by a fourth step in the same manner, in which FIG. 6A is a plan view of the second intermediate blank, FIG. 6B is a cross-sectional view taken along a—a in FIG. 6A, FIG. 6C is a cross-sectional view taken along b—b in FIG. 6A, and FIG. 6D is a cross-sectional view taken along c—c in FIG.

6C.

FIGS. 7A and 7B show a progress of the fourth step, in which FIG. 7A is a partially-enlarged cross sectional view for showing a state prior to urging of a curved portion, and FIG. 7B is a partially-enlarged cross sectional view for showing a state that the curved portions is urged to become a connecting portion, respectively.

FIGS. 8A to

8D show a third intermediate blank obtained by a fifth step in the same manner, in which FIG. 8A is a plan view of the third intermediate blank, FIG. 8B is a cross-sectional view taken along a—a in FIG. 8A, FIG. 8C is a cross-sectional view taken along b—b in FIG. 8A, and FIG. 8D is a cross-sectional view taken along c—c in FIG.

8C.

FIGS. 9A to

9D show an auxiliary intermediate blank manufactured by an auxiliary urging step in a second example of the manufacturing method of a sheet metal rocker arm of the present invention, in which FIG. 9A is a plan view of the auxiliary intermediate blank, FIG. 9B is a cross-sectional view taken along a—a in FIG. 9A, FIG. 9C is a cross-sectional view taken along b—b in FIG. 9A, and FIG. 9D is a cross-sectional view taken along c—c in FIG.

9C.

FIGS. 10A and 10B show a progress of the auxiliary pressing step, in which FIG. 10A is a partially enlarged cross sectional view for showing a state prior to that pressing of a curved portion, and FIG. 10B is a partially-enlarged cross sectional view for showing a state that the curved portions is pressed, respectively.

FIGS. 11A to

11D show the second blank manufactured through a second step according to a third embodiment of the present invention, in which FIG. 11A is a plan view of the second blank, FIG. 11B is a cross-sectional view taken along a—a in FIG. 11A, FIG. 11C is a cross-sectional view taken along b—b in FIG. 11A, and FIG. 11D is a cross-sectional view taken along c—c in FIG.

11C.

FIG.

12A and FIG. 12B show a first embodiment of a cam follower provided with a sheet metal rocker arm according to the present invention. FIG. 12A illustrates a state prior to caulking the both end portions of a pivot, and FIG. 12B illustrates a state after caulking these portions, respectively.

FIG. 13 is a partial schematic cross sectional view of a sheet metal rocker arm according to a second embodiment of the present invention.

FIG. 14 is a cross sectional view for showing a third embodiment of a cam follower provided with a sheet metal rocker arm according to the present invention.

FIG. 15 is a view for showing an inner side surface of a side wall according to the third embodiment.

FIG. 16 is a cross sectional view for showing a fourth embodiment of a cam follower provided with a sheet metal rocker arm according to the present invention.

FIG. 17 is a cross sectional view for showing a fifth embodiment of this cam follower.

FIG. 18 is a cross sectional view for showing a sixth embodiment of this cam follower.

FIG.

19A and FIG. 19B show a blank which is manufactured by the first step when a conventional sheet metal rocker arm is manufactured. FIG. 19A is a plan view of the blank, and FIG. 19B is a cross-sectional view taken along a—a in FIG.

19A.

FIG.

20A and FIG. 20B show the first intermediate blank manufactured by the second step in the same manner. FIG. 20A is a plan view of the first intermediate embodiment, and FIG. 20B is a cross-sectional view taken along a—a in FIG.

20A.

FIG.

21A and FIG. 21B show the second intermediate blank manufactured by the third step in the same manner, in which FIG. 21A is a plan view of the second intermediate blank, and FIG. 21B is a cross-sectional view taken along a—a in FIG.

21A.

FIG.

22A and FIG. 22B show the third intermediate embodiment manufactured by the fourth step in the same manner, in which FIG. 22A is a plan view of the third intermediate blank, and FIG. 22B is a cross-sectional view taken along a—a in FIG.

22A.

Claims

1. A cam follower comprising a sheet metal rocker arm, rollers, and a support shaft, the sheet metal rocker arm to be operatively associated with a valve in a valve drive mechanism of an engine;

2. A cam follower comprising a sheet metal rocker arm, rollers, and a support shaft, the sheet metal rocker arm to be operatively associated with a valve in a valve drive mechanism of an engine;

3. A cam follower comprising a sheet metal rocker arm, rollers, and a support shaft, the sheet metal rocker arm being to be operatively associated with a valve in a valve drive mechanism of an engine;

4. A cam follower comprising a sheet metal rocker arm, rollers, and a support shaft, the sheet metal rocker arm being to be operatively associated with a valve in a valve drive mechanism of an engine;

5. The cam follower according to claim 1, wherein a distance between said imaginary plane and an upper end of each of said wing-shaped portions is larger than a distance between said imaginary plane and an lower end of each of said flap portions.

6. The cam follower according to claim 2, wherein a distance between said imaginary plane and second connecting portions and an upper end of each of said wing-shaped portions is larger than a distance between said imaginary plane and an lower end of each of said flap portions.