JPH0511282Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a so-called built-in type hydraulic valve brush adjuster that is incorporated into a rocker arm.

BACKGROUND OF THE INVENTION A conventional hydraulic valve latch adjuster of this type includes a cylinder body having a bottomed cylindrical plunger slidably fitted therein, and the cylinder body is fitted into a socket of a rocker arm.
Adjacent to the socket, a large-capacity reservoir chamber is formed in the rocker arm.

Problems to be Solved by the Invention In this configuration, in order to ensure a large volume of the reservoir chamber, it is necessary to increase the cross-sectional area of the rocker arm, which becomes a factor in increasing the weight of the rocker arm. Furthermore, since the wall thickness of the bottomed cylindrical plunger is designed to be large, the weight of the adjuster itself becomes large.

The object of the present invention is to provide a hydraulic valve lash adjuster that can reduce the cross-sectional area of the rocker arm and reduce the weight of the plunger while ensuring a large volume of the reservoir chamber. It is something.

Means for Solving the Problems In order to achieve this object, the present invention includes a cylinder body that is fitted into the socket of the rocker arm and has a thin-walled bottomed cylindrical plunger slidably fitted inside. A reservoir component with a recess formed inside the bottomed cylindrical plunger is fitted, and the reservoir chamber formed by the recess of the reservoir component is communicated with the oil supply path in the rocker arm, and the reservoir component and the bottomed cylindrical plunger are connected to each other. A hydraulic valve latch adjuster that communicates with a high pressure chamber formed between the plunger and the plunger via a check valve, characterized in that a reservoir component is connected and fixed at its upper end to the top open end of the cylinder body. Provides hydraulic valve lash adjusters.

Embodiments Embodiments of the invention will now be described in more detail with reference to the accompanying drawings.

In the drawing, a rocker arm 1 is provided with a socket 2, and a cylinder body 4 having a thin-walled bottomed cylindrical plunger 3 slidably fitted into the socket 2 is fitted into the socket 2. A reservoir component 6 forming a recess 5 is located inside the bottomed cylindrical plunger 3, and its upper end is connected and fixed to the open top of the cylinder body. This connection is accomplished by tapering the upper end of the reservoir component and the top open end of the cylinder body, as shown, to fit into each other, and welding the joint. As another example, the upper end of the reservoir component and the open end of the cylinder body may be connected by a screw. Alternatively, a step may be formed on the outer periphery of the upper end of the reservoir component, and this step may be fitted into the open end of the cylinder body, and the two may be connected by welding. The reservoir chamber 7 constituted by the recess 5 of the reservoir component 6 is connected to the oil supply source via the hollow part 9 of the rocker arm shaft 8, the annular groove 10, the radial hole 11 and the oil supply channel 12 in the rocker arm. It's communicating. The reservoir chamber 7 includes a high pressure chamber 13 configured between the reservoir component 6 and the bottomed cylindrical plunger 3.
It communicates with the check valve 14 through the check valve 14. 15 is a retainer, 16 is a valve spring, 17 is a reservoir component 6
and the bottomed cylindrical plunger 3.

When the valve 19 is opened by the rotation of the cam 18, high pressure is generated in the high pressure chamber 13 by the action of the valve spring 20, and during this time the oil in the high pressure chamber is slightly smaller than the gap between the bottomed cylindrical plunger 3 and the cylinder body 4. The leakage to the outside causes the bottomed cylindrical plunger 3 to move toward the contraction side. When the valve 19 closes, the bottomed cylindrical plunger 3
tries to shift to the extension side, and as a result, high pressure chamber 1
Negative pressure is generated in the high pressure chamber 13 from the reservoir chamber 7.
Oil flows through the check valve 14. Since oil is always held in the reservoir chamber 7, air does not immediately flow into the high pressure chamber even when no oil is supplied, such as when starting the engine.

Effects of the invention In this invention, since the reservoir component is connected to the cylinder body at its upper end and placed inside the bottomed cylindrical plunger, a large volume reservoir chamber can be secured in the cylinder body, and the Rocker arm The cross-sectional area of can be reduced. Moreover, since the bottomed cylindrical plunger is constructed with a thin wall, its weight can be reduced.

[Brief explanation of drawings]

The accompanying drawing is a sectional view of a hydraulic valve lash adjuster according to the present invention. 1...Rotzker arm, 2...Socket, 3...Bottomed cylindrical plunger, 4...Cylinder body, 5...
... recess, 6 ... reservoir component, 7 ... reservoir chamber, 12 ... oil supply path, 13 ... high pressure chamber, 14
...Check valve.

Claims (1)

[Scope of utility model registration request] The cylinder body is fitted into the socket of the Rocker arm, and has a thin-walled bottomed cylindrical plunger slidably fitted therein, and a reservoir component having a recess formed in the bottomed cylindrical plunger is fitted into the bottomed cylindrical plunger. Hydraulic type in which a reservoir chamber formed by a concave part of a component is communicated with an oil supply path in a rocker arm, and communicated with a high pressure chamber formed between a reservoir component and a bottomed cylindrical plunger via a check valve. A hydraulic valve lash adjuster, characterized in that a reservoir component is connected and fixed at its upper end to the top open end of a cylinder body.