JPS5999013A - Hydraulic valve clearance adjusting device for internal- combustion engine - Google Patents

Abstract

PURPOSE:To provide an adjustability of oil flow rate through a passage hole from a reservoir chamber to a plunger head etc. by disposing a plate having a suitable number of grooves on its upper surface between a plunger having the reservoir chamber in its interior and plunger head etc. CONSTITUTION:When a reservoir chamber 12 and a high pressure chamber 13 are filled with oil, engine valve opening will apply a pressure to a plunger 2 to generate a high pressure in the high pressure chamber 13. When the engine valve is closed, the plunger 2 is returned by means of a spring 6 to allow the oil to flow from the reservoir chamber 12 to the high pressure chamber 13. In the present constitution, a metering plate 7 having a groove 8 on its upper surface is disposed between the plunger head 10 and plunger 2. When the oil pressure is supplied to the reservoir chamber 12, the metering plate 7 pressed against the plunger head. By such an arrangement, excess oil and air which have flown into the reservoir chamber 12 are drained through a clearance and the groove 8 between the plunger 2 and the metering plate 7 and a clearance of the plunger head 10.

Description

[Detailed description of the invention] This invention relates to a hydraulic valve gap adjustment system for an internal combustion engine.

In the conventional hydraulic valve gap PAD adjustment device, the cylinder is
The cylinder includes a plunger and a plunger head disposed in the cylinder, a reservoir chamber formed therein, a high pressure chamber formed between the closed end of the cylinder body and the granger, and a high pressure chamber located within the high pressure chamber. , and the check valve installed in the Granger.

In such a conventional hydraulic valve clearance arrangement, the plunger head had a conduction hole that extended directly from the reservoir chamber to the outside, so the flow rate of oil leaking from the reservoir chamber through the conduction hole of the jig ranger head was reduced. There was a drawback that it could not be adjusted.

This invention was made by focusing on such conventional problems, and includes a plate having one or several grooves on the upper surface between the open end of the plunger and the granger head or adjuster body. To provide a hydraulic valve gap adjusting device which can adjust the amount of inflow from a reservoir chamber through a conductive hole in a plunger head or an azoyastapodi.

This 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. A lunge 2 is slidably fitted into a cylinder body 1, and a checker 7' is fitted to a runner 2. g/l/8, IJ IJ-Funup ring 4, retainer 5 and check valve force are provided, and 12 chambers are formed inside the plunger. A high pressure chamber 18 is formed by the closed wall of the cylinder body l and the plunger 2, and a holding spring 6 is applied to both (ul) under an appropriate cassette load with a positive J' force ≧.The open end of the plunger 2 On the side, the syringe head IO, which is slidably fitted to the cylinder body 1, is in contact with the plank holder 2, and is removed from the cylinder body using a plane, a hammer, or a tool 99. The open end of the plunger is provided with a recess @52', and a metering plate 7 is installed here.

The concave portion 2' is provided with a 1" cam depth that is less than the thickness of the metering plate, so that the metering plate can freely move between the granger 2 and the plunger 10. An oil supply annular groove is provided on the inner and outer peripheries of the cylinder body l, and both communicate through an oil supply port 14, and communicate with the reservoir chamber 12 through an oil supply port 15 provided in the plunger. , a drain hole 11 extending to the side of the rocker arm is provided, and the surplus 1 of the reservoir 74 follows the gap between the plunger 2 and the metering plate 7 and the groove 8 on the metering plate 7 and the lower surface of the granger head, and the drain hole 11 extends to the side of the rocker arm. 11, it is pushed out to the outside and the contact point kNj-1 between the rocker arm and the blank head slides.

FIG. 2 shows an example in which the plunger 2 and the cylinder body 1 are disposed within the thruster station 16 incorporated in the rocker arm A. In this example, the reservoir chamber 12 is located at the oil supply port 14.15. The drain hole 11 is connected to the oil supply passage 17 in the rocker arm via the oil supply annular groove.The drain hole 11 is formed at the closed proximal end of the adjuster 16 (white is shown in Fig. 1). This is the same as in 911.

Next, I will explain the effect. Assuming that the lizard nozzle chamber 12 and the high pressure head 18 are filled with oil, when the engine valve opens according to the rotation of the cam, force is applied to the granger through the rocker arm, and since the check valve is closed at this time, the high pressure High pressure occurs in the royal room IB. At this time, a small amount of oil leaks through the small gap between the plunger 2 and the cylinder 1, and the grunge 2 is also displaced by that amount.

When the valve closes, the plunger 2 is pushed back by the rear spring 6, and as long as the pressure in the high pressure chamber 18 is lower than the pressure in the reservoir chamber 12, the check valve opens and the reservoir chamber 18
Higher pressure chamber12. Oil flows into.

Oil is constantly supplied to the reservoir chamber 18 from the cylinder head oil circuit or the oil supply path of the rocker arm. qi accumulates. When a sudden burst of air accumulates and the oil in the reservoir chamber is removed, the check valve opens and the pressure chamber sucks in all the air, causing the high pressure chamber to become elastic and not functioning normally. The town will no longer be regulated. For this reason, the conventional method is to provide a conduit 11' to the outside at the closed end of the plunger head IO or adjuster body 16, and push out the air together with the oil from the upper part of the reservoir chamber 18. The oil amount could not be set, which caused problems with cylinder head hydraulic pressure and check valve opening pressure design. In accordance with the invention, the flow rate is regulated by placing a metering plate with a groove 8 on its top surface between the plunger head or adjuster body and the plunger.

When the engine is started and hydraulic pressure is supplied to the cylinder head or rocker arm, the difference between the pressure in the reservoir chamber and atmospheric pressure causes the sizing plate to move to the closed end of the upper granger head or adjuster body. be forced to. Excess oil and air that have flowed into the reservoir chamber are removed from the gap between the granger and the metering plate and from the metering plate's hook 8.
and granger head or adjuster body.
J amount is discharged to the outside.

Claims (1)

[Claims] Hydraulic type in which the granular, in which the cylinder is housed in the cylinder, has a reservoir chamber inside, and a plate having one or more grooves on the upper surface is installed between the granular head or the closed end of the asya study body and the granular. Valve interval @ adjustment device.