JPS5999012A - Transversely disposed hydraulic valve clearance adjusting device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce air which gets into a high pressure chamber at the time of oil intake stroke by forming the inner circumference in a taper where it becomes smaller toward a check valve so that air bubbles which have gotten into a reservoir chamber may kept away from the inlet of the check valve. CONSTITUTION:A hollow plunger 3 and a plunger head 2 are slidably inserted into a cylinder body 1, and a high pressure chamber 13 is formed between the closed end of the cylinder body 1 and the plunger 3. The plunger 3 is provided with check valves 4-6 on its end near to the closed end of the cylinder body 1. A reservoir chamber 14 is formed in the plunger 3 and plunger head 2. The inner circumference of the plunger 3 is formed in a taper which is smaller toward the check valves 4-6. By this constitution, air bubbles contained in the oil supplied from supply ports 8-10 to the reservoir chamber 14 is collected above the plunger head 2, and are drained together with excess oil from an oil drain 11 through a clearance between the cylinder body 1 and the plunger head 2.

Description

[Detailed description of the invention] The present invention relates to a horizontally placed hydraulic valve gap adjustment device.

A conventional horizontal hydraulic valve gap adjustment device basically has a high pressure chamber formed between a cylinder/daper body 1, a flange shouldering a reservoir chamber, a closed end of the cylinder body 1, and a plunger; It consists of a Gueck valve located in the control chamber and installed in the granger.

However, in such a conventional plunger, the inner periphery of the plunger and the inner periphery of the plunger head, which covers the plunger, have the same diameter in the reservoir chamber. Therefore, if the oil supplied from the cylinder head contains air bubbles, the air bubbles that have entered the reservoir chamber will flow to the upper part of the reservoir chamber, including the area near the check valve 2, and the air bubbles will flow to the upper part of the reservoir chamber, including the vicinity of the check valve 2. There was a problem that air from nearby air could easily be sucked in, and if a large number of air bubbles entered the air bubbles, the valve gap could no longer be properly adjusted.

This invention was made to address these conventional problems, and the inner diameter of the plunger is made smaller than the inner diameter of the granger head, or the inner circumference of the plunger is made gradually smaller toward the check valve. The tapered shape allows air bubbles that enter the reservoir chamber to be moved away from the check valve, and the oil-sucking root of the high pressure chamber reduces the amount of air that enters the high pressure chamber.

The present invention will be explained below based on the drawings.

FIG. 1 and FIG. 2 are diagrams showing a new embodiment of the present invention. First, the configuration will be explained. A cylinder body 1 is inserted into a cylinder head, and a plunger 3 and a plunger head 2 on the inner wall are slid inside. A high pressure chamber 13 is formed between the plunger 3 and the closed end of the cylinder body.

A check valve consisting of a check ball 4, a relief spring 5, and a retainer 6 is provided at the cylinder body closed end 11 of the granger 3.The plunger discharge end and the plunger head open end are in contact with each other.
and plunger head 2 cooperate to form a reservoir chamber 14' within them. The inner periphery of the plunger is the same as the check valve I/4'
(Fig. 7) Or two or more points are made thinner than the inner diameter of the plunger head (Fig. 2, 9).

A return spring 7 is installed between the plunger 1 and the closed end of the cylinder body under an excessive set load. A stop collar 12 is attached to the open end of the cylinder body, and the plunger head is pulled out to the outside. I'm trying not to.

The cylinder body is provided with an oil supply port 8, the plunger is provided with an oil supply port 9, and the oil supply annular #9 of the granger head 2 is provided.
The cylinder head hydraulic circuit and the reservoir chamber 14 are communicated through the cylinder head hydraulic circuit. An oil discharge port 11 is provided in the granger head 2 at a portion near the open end of the cylinder.

Next, the effect will be explained. Reservoir chamber 14 and high pressure chamber 13
Assuming that the valve is filled with oil, when the engine pulp opens, a load is applied to the plunger via the plunger head, and a high pressure is generated in the high pressure chamber 13 because the check valve closes. The oil in the high pressure chamber 13 is in the cylinder l and the plunger 8.
There is a slight leakage through the gap between the plunger and the plunger, which displaces the plunger accordingly.

When the engine valve closes, the plunger 8 is pushed back by the return spring 7, and the pressure in the high pressure chamber becomes lower than the pressure in the reservoir chamber.When the check valve eventually opens, the oil in the reservoir chamber 14 flows into the high pressure chamber 18.

Oil is supplied to the reservoir chamber 14 from the cylinder head hydraulic circuit through the supply port 8.9 and IO.

Air bubbles contained in the oil flowing into the reservoir chamber immediately rise and accumulate above the plunger head 2.

Further, the air bubbles are discharged from the oil discharge port 11 to the outside together with excess oil through the gap between the cylinder and the plunger head.

As described above, according to the present invention, by making the inner periphery of the plunger small in diameter or in the shape of a bow/arm, the air bubbles that have entered the reservoir chamber can be kept away from the check valve inlet.
Therefore, air bubbles in the oil sucked into the high pressure chamber can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a horizontally installed hydraulic valve gap adjusting device for an internal combustion engine according to the present invention, and FIG. 2 is a view similar to FIG. 1 showing another embodiment. 1... Cylinder body, 2... Plunger head,
3...Gra/ja, 13...Hyperbaric chamber, 14...I
J-9'-) 4 chambers.

Claims (1)

[Claims] A grunger with an inner wall is slidably fitted into the cylinder body, a pot pressure chamber is formed between the closed end of the cylinder and the plunger, and a plunger head is slidably fitted into the cylinder. , the open end of the granger and the open end of the first ginger head contact each other to form a reservoir chamber therein, and either the inner diameter of the plunger is smaller than the inner diameter of the granger head, or the inner periphery of the plunger is closer to the closed proximal end than the open end. Horizontal type hydraulic valve clearance for internal combustion valves, which is characterized by a tapered shape that becomes smaller as the air pressure increases. Device.