JPS59119006A - Hydraulic valve clearance adjusting device of internal- combustion engine - Google Patents

Abstract

PURPOSE:To supply oil containing no bubble therein through a check valve to a high pressure chamber by a method wherein bubbles are gathered at the central part of a reservoir chamber and discharged by developing the swirling stream of oil in the reservoir chamber of a plunger. CONSTITUTION:Oil is supplied to the reservoir chamber 14 of a plunger 7 sliding within a cylinder body 5 in the direction tangent thereto in order to develop the swirling stream of oil in the reservoir chamber 14. Bubbles in the oil gather themselves at the central part of the reservoir chamber 14 and escape through the opening 18 of a plunger head 6. The oil is the reservoir chamber 14 is separated from bubbles by a partition wall 8 providing openings along its periphery and only the oil with no bubble therein is supplied through a check valve 9 to a high pressure chamber 15. Because of no mixing of bubble in the high pressure chamber 15, the accurate action of the titled device is ensured.

Description

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

The conventional hydraulic valve gap adjustment device has a
A hollow plunger with a check valve assembled at one end is slidably inserted into the plunger, and a high pressure chamber is formed between the closed end of the cylinder body and the end face of the cylinder/jar on the check valve side. The plunger head is slidably fitted so that the open end of the plunger head faces the open end of the plunger, and the plunger head and the hollow part of the plunger head form a reservoir chamber. The head is connected to an external cylinder head hydraulic circuit through an oil passage provided in the head. However, in such a conventional hydraulic valve gap adjustment device, when oil containing many minute air bubbles flows into the reservoir chamber, the bubbles flow along with the oil into the high pressure chamber from the check valve, preventing normal valve gap adjustment function. There was a problem that it inhibited the

This invention was made by focusing on such conventional problems, and a partition wall is provided in a part of the reservoir chamber closer to the check valve than the oil supply port, with the central part closed and the outer periphery -ml open. By providing an oil discharge port from the upper part of the reservoir chamber and using the rotation of this device or by tilting the oil supply port in the circumferential direction, the oil in the reservoir chamber can be drained.
Rotate once and use the circumferential force acting on the oil in the reservoir chamber to
′! ,・To collect air bubbles near the center of the reservoir chamber and quickly discharge them to the outside from the oil outlet at the top of the reservoir chamber. The microbubbles flow into the opening of the check valve from the outer peripheral opening of the partition wall, thereby reducing the amount of microbubbles flowing into the high pressure chamber.

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

FIG. 1 is a diagram showing an embodiment of the present invention. First, the configuration will be explained. The hydraulic valve gap adjustment device ii has a cylinder body 5 slidably fitted to a cylinder head 1. , the closed end of the cylinder body contacts the cam 4. Inside the cylinder, a hollow plunger 7 is fitted with a check valve consisting of a check valve 9, a relief spring 10, and a retainer 11 at one end. It is inserted.

A plunger head 6 is fitted into the cylinder so as to be freely slidable in the cylinder facing the glander 7, and is in contact with the bushing rod 2. Plunger 7 and plunger head 6
forms a Riza + tZ chamber 14 by its hollow part,
Closed end of cylinder body 5 and plunger? A high pressure chamber 15 is formed in a portion surrounded by , and communicates with the cylinder head oil circuit 8 through an oil supply port 16 opened in the reservoir chamber and an oil supply port 17 opened in the plunger head 6 . At a position close to the oil supply port of the reservoir chamber 14 and the check valve, between the open end of the plunger 7 and the open end of the plunger head, there is a partition wall 8 (closed at the center and partially open at the outer periphery). (see FIG. 2) is fixed thereto, and the plunger head is provided with an oil outlet 18 above the reservoir chamber 14. A return spring 12 is placed between the closed end of the cylinder body 5 and the plunger under an appropriate set load. A stone/4' l3 is attached to the open end of Day 5 to prevent the plunger head from coming out.

No. 31￥1 is a diagram showing another embodiment of the present invention, and this hydraulic valve gap! ! ! The lil trimming device is in many respects identical to the embodiment shown in FIG. Therefore, a description of the common structures will be omitted, and the different points will be described below.

A granger head 6, which faces the syringer 7 and whose cylinder is slidably fitted into the die 5, is in the shape of a pin, and is in contact with the rocker arm 2. The plunger 7 and the plunger head 6 are formed into a reservoir chamber by their hollow parts, and the reservoir chamber 14 is connected to an oil supply port 16 opened in the cylinder body 5 and the plunger head 6.
It communicates with the cylinder head oil circuit B through one or more oil supply ports 17 bored in the cylinder head oil circuit B. The oil supply port 17 is inclined in the circumferential direction rather than in the axial direction (see Fig. 7),
A vortex is created when oil flows into the reservoir chamber 14. Similar to the first embodiment, the reservoir chamber 14
A bulkhead 8 whose central part is closed and a part of the outer periphery is open 8' is fixed between the sylanger and the plunger rad 6 at a position closer to the chinic valve than the oil supply port of the syringe. An oil discharge port 18 is provided above the reservoir chamber 14.

Next, the operation of the hydraulic valve gap adjusting device shown in FIG. 1 will be explained. Assuming that the reservoir chamber 14 and the high pressure chamber 15 are filled with oil, when the valve opens, a load is applied by the bushing rod 2 to the plunger 7 and the plunger head 6, and high pressure is generated in the high pressure chamber 15. At this time,
The oil in the high pressure chamber 15 leaks through a small gap between the cylinder medium 5 and the plunger, causing the granger to leak out. and the plunger head 6 is slightly displaced.

When the valve closes, the plunger 7, plunger, and head 6 are pushed back by the action of the return spring 12, and the high pressure chamber 1 is pushed back.
5 becomes a negative pressure relative to the pressure in the reservoir chamber 14, the check valve is pushed open, and oil flows from the reservoir chamber 14 into the high pressure chamber 15. Oil is always supplied to the reservoir chamber 14 from the cylinder head oil circuit, and since the center axis of the cylinder medium 5 is offset from the center of the cam contact surface, this device rotates with the rotation of the cam. As a result, the oil in the p reservoir/9 chamber 14 rotates, and due to the action of the centripetal force in the reservoir chamber part 14-a, oil with a low specific gravity and many fine bubbles gathers in the center, and the oil in the closed part of the partition wall 8 gathers in the center. The oil is discharged to the outside from the oil discharge port 18 above the reservoir chamber 14 while being prevented from moving downward. If there are few air bubbles, the oil will be removed from the outer peripheral open part 8' of the partition wall 8.
It is then supplied to the high pressure chamber 15 through the reservoir chamber portion 14-b.

In the example shown in FIG. 3, when oil is supplied to the reservoir chamber from the cylinder head oil circuit, a vortex is generated in the reservoir/chamber portion 14-a because the oil supply port 17 is inclined in the circumferential direction. do. Due to the action of the centripetal force, the oil, which has a light specific gravity and many fine bubbles, gathers in the center and is prevented from moving downward by the closed part of the partition wall 8.
8 and is discharged to the outside. Oil with few air bubbles is supplied from the outer peripheral open end 8' of the partition wall 8 to the high pressure chamber 15 through the reservoir chamber portion 14-b.

According to the present invention, microbubbles are collected near the center of the reservoir/reservoir chambers by rotating the oil in the four reservoir chambers, and the partition wall prevents the oil containing many microbubbles from moving downward. Therefore, such microbubbles can be quickly discharged from the upper part of the storage chamber to the outside through the oil discharge port, and when oil is supplied to the normal pressure chamber, the oil can be discharged from the outer peripheral opening of the partition wall to the outside. Since the bubbles flow into the check depression, the amount of microbubbles flowing into the high pressure chamber can be significantly reduced.

[Brief explanation of drawings]

FIG. 7 is a sectional view showing an example of a hydraulic valve gap fA adjustment device according to the present invention, FIG. 2 is a plan view of a partition wall used in this device, and FIG. 3 is a cross section ν1 showing another example of this device. Figure 9 is A-A of Figure 3.
FIG.

Claims (1)

[Scope of Claims] If) A hollow plunger with a check valve assembled at one end is slidably inserted into the cylinder body, and a high pressure chamber is formed between the closed end of the cylinder medium and the check valve side end surface of the above-mentioned gra/sha. On the other hand, a hollow plunger head is slidably fitted into the cylinder body so that the open end of the hollow plunger head faces the open end of the plunger, and the hollow part of the plunger and the plunger head forms a reservoir chamber, and the reservoir chamber communicates with the external 7-ring head oil circuit through an oil passage provided in the cylinder medium and plunger head,
On the side closer to the check valve than the plunger head oil passage, the reservoir chamber is provided with a partition wall whose central part is closed and a part of the outer periphery is open, and an oil discharge port is provided at the upper part of the reservoir chamber. Hydraulic valve gap adjustment device. 121. The hydraulic valve gap adjusting device according to claim 117, which is used as a tappet by bringing the bottom surface into contact with the cam and offset the cam contact center from the tappet center. 131 1J The hydraulic valve gap adjusting device according to claim 111, wherein the oil supply port to the zapar chamber is inclined in the circumferential direction.