JPH06108805A - Rocker arm of engine - Google Patents

Abstract

PURPOSE:To miniaturize the rocker arm of an engine, and reduce the weight thereof so as to rotate the engine with high speed, and also improve fuel consumption rate by changing the one end shape of the rocker arm used in the engine of a vehicle. CONSTITUTION:In the rocker arm 1 of an engine on which rush adjustor 5 is mounted on one end, a mounting chamber 4 for mounting the rush adjustor 5 and an oil reservoir chamber 6 positioned on the top part of the mounting chamber 4 are formed by inclining respective center lines. In the case where the center line of the oil reservoir chamber 6 is set so as to be inclined to the center side direction of the rocker arm 1 in relation to the center line of the mounting chamber 4 of the rush adjuster 5, this part is not enlarged incomparison with the other end side. As a result, increase in inertia moment is prevented by this inclination. It is thus possible to improve output of an engine and fuel consumption.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocker arm for an engine, which is applied to a four-cycle engine used in automobiles and motorcycles.

[0002]

2. Description of the Related Art In a four-cycle engine, a camshaft which rotates in conjunction with a crankshaft is provided, a cam provided on the camshaft drives a rocker arm, and the rocker arm drives an intake / exhaust valve provided on a cylinder head. It is designed to open and close. Since play occurs at the contact portion between the rocker arm and the cam or the contact portion between the rocker arm and the valve stem, as a structure for eliminating this, a lash adjuster is attached to one end of the rocker arm. This lash adjuster supports the force from the cam or valve by the pressure of the lubricating oil of the engine.

There are the following two types of places for mounting the lash adjuster. That is, the rocker arm
A rocker shaft is inserted in the center position of the rocker shaft so that the rocker shaft can be rotated about the rocker shaft.
In a structure in which the upper end of the valve stem is in contact with one end of the rocker arm and the cam is in contact with the other end, it is provided at the contact portion between the rocker arm and the valve stem. -73506 gazette etc.).

Further, in the structure in which one end of the rocker arm abuts on a fixing member such as a cylinder head and the other end abuts on the upper end of the valve stem and the cam abuts on the intermediate portion, It will be provided in the part which contacts the fixed member at one end.

FIG. 4 shows a conventional rocker arm in the former structure. The rocker arm 1 has a substantially L-shape, and rotates about a rocker shaft 3 inserted in a hole 2 provided at a substantially central position by a predetermined angle. A mounting chamber 4 for mounting the hydraulic lash adjuster is provided at one end of the rocker arm 1, and the lash adjuster 5 is inserted and mounted therein as shown in FIG. An oil reserve chamber 6 is formed above the mounting chamber 4, and the oil passage 7
The lubricating oil is supplied from a lubricating system (not shown) via the. A roller 8 is rotatably attached to the other end of the rocker arm 1 by a shaft 9. The roller 8 contacts the cam, as will be described later.

In the rocker arm 1, the mounting chamber 4 and the oil reserve chamber 6 are oriented in the same direction as shown in the figure, and the center lines (not shown) are oriented in parallel. Therefore, the oil reserve chamber 6 of the rocker arm 1
Since the side on which the roller 8 is provided projects to the outside, it becomes larger than the side on which the roller 8 is provided. This can be said even when the mounting chamber 4 and the oil reserve chamber 6 are provided at concentric positions without shifting their center lines as shown in the figure.

[0007]

As described above, when one end side is larger than the other end side, the degree of freedom of the peripheral portion is reduced by design, which increases the difficulty in layout and the moment of inertia. The engine output will be wasted because it will also become large.

The present invention has been made in view of this point, and an object of the present invention is to provide a rocker arm that solves the above-mentioned problems by improving the portion where the oil reserve chamber is provided.

[0009]

Means for Solving the Problems As a means for solving the above problems, the present invention provides a rocker arm of an engine having a hydraulic lash adjuster at one end thereof, and a mounting chamber for mounting the hydraulic lash adjuster, and the mounting chamber. The oil reserve chamber located in the upper part of the chamber is formed so as to be inclined so that each center line has an angle.

[0010]

With this structure, by setting the center line of the oil reserve chamber to be inclined toward the center of the rocker arm with respect to the center line of the mounting chamber in which the hydraulic lash adjuster is mounted, this part is The moment of inertia does not increase because it does not increase compared to the end side.
Therefore, the output of the engine is not wasted.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the present invention, the mounting chamber 4 for mounting the hydraulic lash adjuster and the oil reserve chamber 6 located above the mounting chamber 4 are formed so as to be inclined so that their respective center lines have an angle. As can be seen from a comparison between FIG. 1 and the conventional FIG. 4, in the present invention, the degree of protrusion to the right in the figure is small, so that this rocker arm 1 is centered on the rocker shaft 3. When turning, the turning locus becomes smaller than that of FIG.

FIG. 3 shows an engine incorporating the rocker arm 1 shown in FIG. In this figure, 10 is a cam shaft, 11 is a cam, and the cam 8 is in contact with the roller 8 pivotally mounted on the rocker arm 1 by a shaft 9. A lash adjuster 5 is inserted and mounted in the mounting chamber 4 for mounting the hydraulic lash adjuster, and the lower end of the lash adjuster 5 is in contact with the upper end of the valve stem 12. 13 is a valve spring, 14 is a cylinder head, and 15 is a cylinder head cover.

As can be seen from FIG. 3, the rocker arm 1
When the engine is installed in the engine, the oil reserve chamber 6
Becomes almost vertical. As shown in FIG. 3, the rocker shaft 3 is provided with oil supply passages 16 and 17, which communicate with an oil pump (not shown). As a result, when the engine is operating, the oil supply passages 16 and 17 are
The lubricating oil passing through the oil passage 7 is supplied to the oil reserve chamber 6. In the oil reserve chamber 6, the oil and the air are separated, and the oil is supplied to the lash adjuster 5.

[0014]

The present invention is a rocker arm for an engine constructed as described above. With this configuration,
By setting the center line of the oil reserve chamber so that it leans toward the center of the rocker arm with respect to the center line of the mounting chamber where the hydraulic lash adjuster is mounted, this part does not become larger than the other end, so the valve operating It is possible to reduce the inertial weight of the system. As a result, the engine speed can be increased and the fuel consumption rate can be improved.

Since the cylinder head and the cylinder head cover can be made compact in relation to the shape of the rocker arm, the overall weight can be reduced. The center line of the oil reserve chamber is made parallel to the center line of the mounting chamber where the hydraulic lash adjuster is mounted, and the oil volume in the oil reserve chamber can be made larger than that of the offset in that state, so when restarting It is advantageous for eliminating abnormal noise. If the oil reserve chamber is vertical, less oil will escape when the engine is stopped.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an embodiment of the present invention.

FIG. 2 is a plan view of that of FIG.

FIG. 3 is a front view showing a part of an engine incorporating the one shown in FIG.

FIG. 4 is a partial cross-sectional view of a conventional rocker arm.

FIG. 5 is an explanatory view showing a case where the lash adjuster is attached to that of FIG. 4;

[Explanation of symbols]

 1 Rocker Arm 3 Rocker Shaft 4 Installation Room 5 Rush Adjuster 6 Oil Reserve Room 7 Oil Passage

Claims (1)

[Claims] 1. A rocker arm of an engine having a hydraulic lash adjuster at one end, wherein a center line of a mounting chamber in which the hydraulic lash adjuster is mounted and an oil reserve chamber located above the mounting chamber are angled. A rocker arm for an engine, wherein the rocker arm is formed so as to be inclined.