JPH0113763Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a valve seat for an internal combustion engine that is in close contact with a valve face and prevents compression leakage in a combustion chamber.

Generating swirl in the combustible mixture in the combustion chamber of an internal combustion engine to create turbulence in the combustible mixture improves combustion efficiency and reduces combustion noise.
Furthermore, it is well known that harmful substances in exhaust gas can be easily reduced.

The method for generating the swirl described above is to form an inclined groove on the intake side valve seat and naturally generate the swirl when the air-fuel mixture passes through the inclined groove, but the swirl generation effect is extremely excellent. However, since the groove is inclined, it was difficult to form the inclined groove on the valve seat (manufacturing) and to take out the valve seat (product) on which the inclined groove was formed, making mass production difficult. was wrong.

A technical object of the present invention is to provide a valve seat for an internal combustion engine that has an excellent swirl generation effect and is easy to manufacture and take out of the product.

The structure of the present invention, that is, the technical means for solving the above technical problem is as follows.

A valve for an internal combustion engine in which a valve seat of an intake valve is divided into an inner peripheral part and an outer peripheral part, the inner peripheral part is made of a steel corrugated plate having a plurality of inclined grooves, and the inner peripheral part is joined to the outer peripheral part. It's on the sheet.

With the above technical means, manufacturing is facilitated and there is no need to take out the product after manufacturing, and since there is an air space between the inner and outer peripheries, the space for the combustible mixture to flow is relatively wide. The swirl generation effect is superior to other valve seats.

An embodiment of the present invention will be described below based on the drawings.

1 is an intake valve consisting of a valve head 11, a valve face 12 and a valve stem 13, and the intake valve 1 is connected to an intake port 4 of a cylinder head 3.
It is slidably fitted into the intake valve stem guide 8 that is press-fitted on the side.

Reference numeral 2 denotes a valve seat that fits into the combustion chamber 7 side of the intake port 4 of the cylinder head 3. The valve seat 2 is divided into an outer peripheral part 22 and an inner peripheral part 21, and the outer peripheral part 22 has inner and outer peripheral surfaces 23, 24 is formed in a cylindrical shape, and the inclination angle formed by the abutting surface 251 of the outer peripheral part 22 and the abutting surface 252 of the inner peripheral part 21 is the same as that of the valve face 12. The inner circumferential portion 21 is a steel plate 2 as shown in FIG.
21 is formed with unevenness on the inside and outside by pressing or the like, and at the same time or subsequently, a tongue piece 51 having an inclined surface 5 is formed, and the inner circumferential portion 21 is bent into a cylindrical shape, and both ends thereof are made to coincide with each other.

When the inner circumferential portion 21 is connected to the outer circumferential portion, an inclined circulation space 6 is formed between the inner circumferential surfaces 24 of the outer circumferential portion 22 and is integral with the inclined grooves on the inner circumferential surface.

It is preferable that both ends of the inner circumferential portion 21 be joined by brazing, for example.

When joining the inner peripheral part to the outer peripheral part, the inner peripheral part is assembled so as not to come into contact with the valve face.

The effect will be explained.

The outer periphery of the valve seat of the present invention is made of cast iron, heat-resistant steel, or sintered metal, and fits on the intake port side, and the inner periphery of the corrugated steel plate with multiple inclined grooves is connected to its inner surface. Therefore, it is possible to generate a swirl in the combustible air-fuel mixture passing through the inner circumference, and at the same time, in combination with the circulating air, the swirl generation effect can be enhanced.

Moreover, the inner peripheral portion can be formed by punching out a steel plate relatively easily by processing such as pressing.

Therefore, compared to the conventional method of forming an inclined groove directly on a valve seat, this method is simpler, eliminates the difficulty of taking out the product, and is extremely practical, helping to reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of the valve seat of the present invention fitted, FIG. 2 is a partially enlarged sectional view of the valve seat of the present invention, and FIG. 3 is a partially enlarged plan view of the valve seat of the present invention. 1: Intake valve, 2: Valve seat, 21: Inner periphery, 5: Inclined surface, 22: Outer periphery.

Claims (1)

[Claims for Utility Model Registration] (1) The valve seat of an intake valve is divided into an inner peripheral part and an outer peripheral part, the inner peripheral part is made of a corrugated steel plate having a plurality of inclined grooves, and the inner peripheral part is A valve seat for an internal combustion engine, characterized in that the valve seat is coupled to the outer peripheral portion. (2) The valve seat for an internal combustion engine according to claim 1, wherein the divided inner peripheral portions of the valve seat of the intake valve are made of steel bands having inclined grooves.