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Cam follower for rocker arm, and cam follower device

A technology of cams and moving parts, applied in the field of cam followers for rocker arms, can solve the problems of shortening the life of rolling bearings, supplying lubricating oil to rolling bearings, etc., and achieve the effect of improving the life of bearings

Inactive Publication Date: 2011-07-20
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, when the end surfaces of the plate and the outer ring are in contact, the plate and the outer ring are in close contact without gap due to the viscosity of the lubricating oil, so the lubricating oil cannot be smoothly supplied to the inside of the rolling bearing, and the life of the rolling bearing is shortened.

Method used

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  • Cam follower for rocker arm, and cam follower device
  • Cam follower for rocker arm, and cam follower device
  • Cam follower for rocker arm, and cam follower device

Examples

Experimental program
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Embodiment Construction

[0028] Hereinafter, embodiments of the present invention will be described in detail based on Examples shown in the drawings.

[0029] figure 1 It is a front view showing the movable valve mechanism incorporating the cam follower of the first embodiment of the present invention. The movable valve mechanism 1 is an engine part of a motor vehicle, and is equipped with: a rocker arm 2 supported by a shaft 5 to be able to swing; it is arranged at one end of the rocker arm 2, and the intake and exhaust of the engine combustion chamber are performed by the swing of the rocker arm 2 valve 3; a support shaft 6 arranged at the other end of the rocker arm 2; an outer ring 11 rotatably supported by the outer periphery of the support shaft 6; a cam 4 fixed to a camshaft (not shown) and having an eccentric portion 4a .

[0030] The movable valve mechanism 1 configured as described above transmits the rotation of a crankshaft (not shown) of the engine to a camshaft (not shown) via a timin...

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Abstract

A cam follower for a rocker arm is provided with a circular cylindrical outer ring (11) having an outer peripheral surface making contact with a cam, a support shaft (6) for supporting the outer ring (11), rollers (12) arranged in an annular space between the support shaft (6) and the outer ring (11), and side plates (16) formed as circular ring-shaped discs, allowing the support shaft (6) to penetrate therethrough, facing end surfaces (15) of the rollers (12), and having an outer diameter (Ds) less than the inner diameter (Dr) of the outer ring (11). The side plates (16) are located at opposite ends of each of the rollers (12) and satisfy the relationship of Lr<Lk+2t, where Lk is the length of each of the rollers (12) in the direction of the axis thereof, Lr is the length of the outer ring (11) in the direction of the axis thereof, and t is the thickness of each of the side plates (16).

Description

technical field [0001] The present invention relates to a cam follower for a rocker arm used in a movable valve train of an internal combustion engine. Background technique [0002] The rocker arm of the engine swings by the rotation of the cam to open and close the intake valve and exhaust valve. The following prior art is known: in order to reduce the frictional loss during the operation, the outer ring between a pair of legs of the rocker arm is supported to be rotatable by a rolling bearing without a cage, and the rocker arm and the cam are rotatably supported. Make rolling contact. [0003] Cageless rolling bearings can be used in high-load applications, but there are cases where the end faces of the outer ring and the end faces of the rollers come into contact with the legs of the rocker arm to cause seizure. Especially when the rocker arm is made of light metal, the wear of the rocker arm increases. Moreover, the metal powder produced by wear will damage the rollin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H53/06F01L1/18F16C33/66
CPCF01L1/053F01L1/181F16C13/006F16C33/6659F16H53/06F16C21/00F16C2360/18Y10T74/2107F16H57/04
Inventor 片山昭彦阿部克史长谷川寿贵黑田优
Owner NTN CORP
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