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Rocker arm for valve control apparatus

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Rocker arm for valve control apparatus


To provide a rocker arm for a valve control apparatus of an automobile engine, which enables downsizing of the valve control apparatus and provides improved fuel economy of the engine. The rocker arm is provided with: a top plate; at least one upright wall section; a cam slide section, formed on top of the top plate, in contact with a cam mounted on a camshaft; a supporting member for rockably supporting the rocker arm about the rocking center of the supporting member; and a pad face, formed at the other end of the rocker arm, in contact with a valve system. Said at least one upright wall section has a smaller width than the top plate, and extends from the top plate at a substantially right angle.
Related Terms: Downsizing

Browse recent Nittan Valve Co., Ltd. patents - Kanagawa, JP
USPTO Applicaton #: #20140007832 - Class: 123 9039 (USPTO) -
Internal-combustion Engines > Poppet Valve Operating Mechanism >Rocker

Inventors: Ken-ya Sugawara, Mamoru Kato

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The Patent Description & Claims data below is from USPTO Patent Application 20140007832, Rocker arm for valve control apparatus.

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FIELD OF THE INVENTION

This invention relates to a rocker arm for use with a valve control apparatus for controlling the valve open/close operation of an automobile engine via a rocker arm rocked by the cam of a camshaft, the rocker arm providing an improved the fuel economy of the engine and enabling down sizing of the valve control apparatus

BACKGROUND ART

OF THE INVENTION

A rocker arm rocked by a cam driven by a camshaft of the engine for lifting and lowering an engine valve is disclosed in a patent document listed below. The rocker lever (rocker arm) 1 of Patent Document 1 has a semi-spherical recess 2 engaged with the semi-spherical end 4 of a support member 3 for rockably supporting the rocker lever 1 in contact with the base section (or valve stem) of a gas exchange valve (engine valve) urged by a valve spring for closing the valve (not shown). Provided at the center of the rocker lever (rocker arm) 1 is a roller 6 in contact with a camshaft (not shown). The rocker lever 1 opens the engine valve by pushing down the roller 6 (not shown) and allows the engine valve to be closed by means of a valve spring (not shown) urging the valve.

PRIOR ART DOCUMENT

PATENT DOCUMENT: JPA Laid Open H10-37719

SUMMARY

OF THE INVENTION Objects to be Achieved by the Invention

In general a camshaft is subjected to a force of a valve spring urging the valve stem to close the valve and a frictional torque generated between the rocker arm and the cam pushing down the rocker arm in opposition to the force of the valve spring during a valve opening period. This frictional torque impedes the rotation of the camshaft. Since this frictional torque lowers the fuel economy of the engine, the valve control apparatus of Patent Document 1 utilizes a rocker lever 1 having a roller 6 in contact with the cam so as to reduce the friction between the cam and the rocker arm, and hence the frictional torque acting on the camshaft.

However, although the roller 6 can reduce the friction between the cam and rocker lever 1, such roller 6 greatly increase the weight of the rocker lever 1, since the roller 6 requires needle bearings for example. An increase in weight of the rocker lever 1 entails an increase in the inertial moment of the rocker lever 1, which implies that a stronger valve spring is required to close the valve. However, a stronger valve spring will cause the roller 6 to exert a stronger force on the cam, thereby increasing the frictional torque acting on the camshaft.

As a consequence, in spite the roller 6 can reduce the frictional torque, the rocker lever 1 having such roller 6 suffers from an increment of the frictional torque due to the increased spring force of the valve spring. Hence, reduction of the frictional torque by the use of cam in rolling contact with the roller 6 is overwhelmed by an increment of the frictional torque due to an increment of the valve force of the valve spring. This is a serious problem from the point of the fuel economy of the engine. The use of a roller poses a further problem that it increases the dimensions of the rocker lever 1, making it difficult to downsize the valve control apparatus.

In view of the problems mentioned above, the present invention is directed to an improved rocker arm operably coupled to the camshaft, which enables not only reduction of the disadvantageous frictional torque that impedes the rotation of the camshaft but also enables downsizing of the valve control apparatus, thereby facilitating improvement of the fuel economy of the engine.

Means for Achieving the Objects

An inventive rocker arm for a valve control apparatus in accordance with claim 1 has a top plate and at least one upright wall section, wherein the top plate is: provided on top thereof with a cam slide section in contact with a cam of a camshaft; supported at one end thereof by a supporting member rockably about the rocking center of the supporting member; and is provided at the other end thereof a pad face in contact with a valve system, and said at least one upright wall section has a smaller width than the top plate, and extends from the top plate at a substantially right angle.

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Industry Class:
Internal-combustion engines
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stats Patent Info
Application #
US 20140007832 A1
Publish Date
01/09/2014
Document #
14006883
File Date
10/04/2011
USPTO Class
123 9039
Other USPTO Classes
International Class
01L1/18
Drawings
8


Downsizing


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