JPS5999011A - Hydraulic valve clearance adjusting device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To enable draining of air which gets into a high pressure chamber quickly out of high pressure chamber by providing a through-hole in a cylinder body, and by inserting a cylindrical body having a cup-like shape into the cylinder body with a very small clearance. CONSTITUTION:A hollow plunger 2 is slidably inserted into a cylinder body 1, and a high pressure chamber 7 is formed between the closed end of the body 1. The plunger 2 is provided with check valves 3-5 on its end near to the closed end of the cylinder body 1, and the open and end of the body 1 is plugged to form a reservoir chamber 8 in its interior. A through-hole to the outside is drilled in the upper part of the high pressure chamber 7 of said body 1. A cup- like cylindrical body 16 one end of which is closed is inserted over the outer circumference of said body 1 with a very small clearance to adjust the rate of leak from the high pressure chamber 7. By such an arrangement, air which has gotten into the high pressure chamber 7 through the check valves 3-5 is quickly drained to the outside out of the high pressure chamber 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic valve gap adjusting device used in horizontal or inclined position.

In a conventional hydraulic valve gap adjustment device, a high pressure chamber with a check valve is formed between the closed end of the cylinder body and the plunger, and the oil that passes through the gap between the cylinder body and the plunger is prevented from flowing through the high pressure chamber. , machining accuracy of cylinder body or plunger, deviation from one side, gap thickness 1
The flow rate is higher in the areas with smaller gaps, and the flow rate is lower in areas with smaller gaps, so when using it horizontally or tilted, air may enter the high pressure chamber. If the small gap between the mesodie and the plunger is located above, there is a problem in that the air flowing above the high pressure chamber interferes with the valve gap adjustment function that allows the high pressure chamber to be evacuated.

This invention was made by focusing on such conventional problems, and includes providing a conduction hole in the cylinder body from above the high-pressure chamber to the outside of the cylinder body, and by using a restraint between the cylinder body and the cup-shaped cylindrical body. By adjusting the flow rate of leakage from the high-pressure chamber using the gap, the leakage that has entered the high-pressure chamber can be quickly discharged to the outside of the high-pressure chamber.

Hereinafter, this invention will be explained based on the present invention.

FIG. 1 is a diagram showing an embodiment of the present invention. First, during an acceptance inspection, a cylinder body 1 is placed in a cylinder head, and is positioned circumferentially with respect to the cylinder head by a pin 13. ing. A plunger 2 on the inner wall is slidably fitted into the cylinder body, and a high pressure chamber 7 is formed between the plunger 2 and the closed proximal end of the cylinder body. A check valve consisting of a check ball 3, a relief spring 4, and a retainer 5 is provided on the closed end side of the granger 2, and the open end side of the cylinder body of the granger 2 is closed to form a reservoir chamber 8 inside. ing. A stop collar 12 is fixed to the open end of the cylinder body to prevent the plunger from coming out of the outside fls of the cylinder body. It also has the function of determining the direction of 11 gongs. A return spring 6 is placed between the plunger and the closed proximal end of the cylinder body under a suitable set weight.

The cylinder body 1 has a conduction hole 9 above the high pressure chamber 7 to the outside.
is provided.

The cylinder is provided with an oil supply port 10 in the cylinder gear 1 and an oil supply port 11 in the cylinder gear 2. There is.

An oil discharge port 14 is provided in a portion of the granger 2 near the open end of the cylinder body.

A cup-shaped cylindrical body part 16, one end of which is a closed end, is fitted into the outer circumferential portion of the cylinder body on the closed end side with a small gap therebetween to control leakage from the pressure chamber.

FIG. 1 shows an example in which a conduction hole 9 is provided at the closed end of the cylinder body 1, and the rest is the same as the example shown in FIG.

Next, the effect will be explained. Assuming that the reservoir chamber 8 and the high pressure chamber 7 are filled with oil, when the engine pulp opens, there will be heavy pressure in the high pressure chamber 7 because the check valve is sealed and the check valve is sealed. Occur. At this time, the oil in the high pressure chamber 7 flows through the gap between the cylinder 1 and the granger 2, through the conduction hole 9, and between the cylinder 1 and the cup-shaped cylindrical body 16.
The plunger is moved slightly outward through the gap between the plunger and the plunger.

When the engine pulp closes, the return spring pushes the rainbow plunger 2r back, and the pressure inside the pressure chamber 7 becomes lower than the pressure inside the reservoir trap 8, and the check valve opens and the oil in the reservoir chamber 8 follows the check valve to the high pressure chamber 7. It flows in.

The reservoir chamber has a supply groove 10 from the cylinder head oil circuit.
Oil is always kept flowing through the reservoir 11, and excess oil and oil in the reservoir are discharged to the outside through the discharge hole 14t through the gap between the cylinder and the granger.

When the reservoir chamber 8 is not filled with sufficient oil, such as when starting the engine, or when a large amount of oil is contained in the oil, air may enter the high pressure chamber through the check valve. The oil accumulates in the upper part of the high pressure chamber, and as the engine pulp opens, it passes through the through hole 9 and the entire gap between the cylinder 1 and the cup-shaped cylinder 16, and is discharged to the outside along with the oil.

According to the present invention, the cylinder body is provided with a conduction hole from above the high pressure chamber to the outside of the cylinder, and the high flow from the high pressure chamber is prevented by the small gap created by the fitting between the cylinder and the cup-shaped cylindrical body. By adjusting the analysis, it has the advantage of being able to quickly expel particles that have entered the high-pressure chamber to the outside of the high-pressure chamber.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a hydraulic valve clearance adjustment value of an internal combustion engine according to the present invention, and FIG. Ω is a diagram similar to the first example showing another embodiment of the present invention.

Claims (1)

[Claims] (11 A hollow plunger is slidably fitted into the cylinder body, and a high pressure chamber is formed between the closed end of the cylinder body and the plunger, and a cup whose one end is a closed end is formed on the outer periphery of the closed end of the cylinder body. A hydraulic valve gap adjustment device for use in a horizontal or inclined position, characterized in that cylindrical bodies are fitted with a small gap and a cylinder body is provided with a guide a extending to the outer wall of the cylinder body at the upper part of the high pressure chamber. .