JPS58106111A - Poppet valve - Google Patents

Abstract

PURPOSE:To prevent burning or damage of a poppet valve of intake and exhaust valves or the like used for an engine, by providing piston rings in the vicinity of a valve head part in the poppet valve. CONSTITUTION:An exhaust poppet valve is constituted such that at least a piston ring 11 is fitted to a valve head part 1a to always contact the piston ring 11 to an internal peripheral surface 12 in the vinicity of a valve seat in a cylinder head 3. Many communication holes 13 are drilled from the bottom surface of the valve head 1a to the upper part of the piston ring 11, and a contact face 14 to the valve seat 6 of the valve is provided further in the upper part from an outlet of the holes 13. In this way, burning or damage of the valve can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mushroom-shaped valve used for supplying and exhausting an engine.

The structure of a conventional mushroom valve for air supply and exhaust will be explained with reference to Figure 1. The mushroom valve consists of a valve head l and a valve stem 2, with the valve head 1 provided at one end of the valve stem 2, and the other end. The end is connected to a moving 9F device (not shown), and the f nine-valve umbrella l is located in the cylinder 11.

The cylinder 3 is fixed to the upper part of the cylinder and has a cooling fluid 11I circuit 4 and a suitable connection 5 inside the cylinder.

The valve seat 6 is fixed to the cylinder 3 and has a 9 cylindrical shape T&L.
,, its central axis coincides with the central axis of the valve stem 2. **
The inner diameter of * is formed to be slightly smaller than the outer diameter of the valve head 1, and the valve seat opening serves as a communication hole between the inside of the cylinder and the gas passage 5.

The valve head 7 is fixed to the cylinder head 3 and has a valve guide 8 inside thereof. This valve guide 8 is provided with a hollow hole, into which the valve rod 2 is inserted.

The 9P spring 9 is inserted between the metal fitting 10 attached to the head of the valve stem 2 and the valve head 7, and constantly biases the valve head 1 of the mushroom-shaped valve in a direction in which it comes into close contact with the valve seat 6. Normally The valve umbrella 1 is brought into close contact with the valve seat 6 by the biasing force of the valve spring 9, and the valve is closed and gas is not allowed to flow therethrough.

However, when the end of the valve stem 2 is pushed down by the motion*i device against the biasing force of the spring 9, the valve head 1 separates from the valve seat 6, the mushroom valve is opened, and the inside of the cylinder and the f-pass passage 5 are communicated. Although the exhaust valve of the Ennon is constantly exposed to high-temperature exhaust gas, cooling of the cylinder relies mainly on heat transfer from the valve seat 6 to the cylinder head 3 when the valve head 1 contacts the valve seat 6. ing. With such an exhaust valve cooling mechanism, when the engine is operated with a high charge, the temperature of the valve bald material may exceed the allowable temperature, which may burn out the sealing surface or damage the fluid, reducing the output of the ennon or rendering it inoperable. It happens often.

An object of the present invention is to provide a mushroom valve that has extremely good cooling properties, does not burn out even when used as an exhaust valve, and is highly durable.

An embodiment of the Kinokodaben according to the present invention will be described below with reference to Figures 2 and 3.

Here, the same or equivalent components as those of the conventional device will be described using the same reference numerals.

FIG. 2 shows a first embodiment of the present invention, in which a valve head portion 1a4C of an exhaust mushroom valve is fitted into at least one piston ring 1lt, and is connected to the piston ring 11 and the cylinder on the inner periphery near the valve seat of the door 3. &112 are always honored. A large number of communication holes 13 are bored from the bottom surface of the ff umbrella 1a to the top of the piston ring 11, and the contact surface 1 with the valve seat 6 of the square is bored.
4 is provided further above the outlet of the communication hole 13.

The operation of the embodiment constructed as described above will be explained below.

In Fig. 2, when the valve is opened, the combustion gas in the cylinder flows to the valve head 1.
The gas flows from the communication hole 13 of & through the opening 12 of the valve seat 6 to the gas passage W&5. Next, when the square moves upward and the valve seat contact surface 14 of the square comes into close contact with the valve seat 6, the gas inside the cylinder enters the communication hole 13, but is sealed by the valve seat part 6. The mushroom valve is equipped with a valve umbrella @ 1 a K piston ring 11, and this piston ring 11 and the cylinder head 3 are constantly sliding, and especially when this valve is used as an exhaust valve, the M section area is The effect of heat dissipation is extremely large. Figure 3 shows the second embodiment of the present invention, which differs from the first embodiment in that the position where the piston ring 1 is inserted into the valve umbrella 1 is located at the top. There is. An inlet is provided at the upper part of the valve seat area [fi14] and is connected to the upper surface of the valve umbrella l through the communication hole 13at.

The operations and effects of the second embodiment are almost the same as those of the first embodiment.

Note that the present invention is also applicable to intake valves.

' As mentioned above, the mushroom tilt according to the present invention is equipped with a piston ring that slides on the inner circumferential surface of the KW seat near the valve head, so the valve is cooled when the cell is closed, as in the conventional example. Even if the piston ring is valved at the same time, heat is constantly dissipated to the cylinder spatula 9, which is extremely effective in preventing malfunctions such as compression leaks and engine stoppage due to burnout or damage to the valve.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional structural view of a conventional mushroom in the prone and upright position, and FIGS. 2 and 3 are mushroom valves according to the present invention, respectively. This is a second example. l... Valve umbrella, 6... Valve seat, 11... Piston ring, 12... Valve seat inner surface. Figure 2 Figure 3

Claims (1)

[Claims] A mushroom-shaped valve, such as a main valve for an engine supply and exhaust valve, characterized in that a piston ring that slides on the inner circumferential surface of a valve seat is layered at f7 near the valve head of the mushroom-shaped valve.