JPH04117107U - valve stem seal - Google Patents

Abstract

(57) [Summary] [Purpose] The structure was designed to facilitate the combination of the engine with the valve train and to stabilize the connection. [Structure] A metal ring to which a sliding seal part is bonded to the circumferential surface of the valve stem is formed into a substantially L-shaped ring having a cylindrical part on the outer circumferential side and a radial part extending inward from the end of the cylindrical part. At the same time, an annular recess surrounding the valve guide is provided in the cylinder head, and the cylindrical part of the metal ring is inserted into the annular recess of the cylinder head to position the valve spring within the cylindrical part of the metal ring. The structure is such that the radial portion of the metal ring is pressed by the valve spring.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to valve stem seals used in engine valve train systems. Specifically, the valve system is characterized by its stable combination with the cylinder head, etc. It presents the structure of Temseal.

0002

[Conventional technology]

The valve train of an engine includes a valve stem and a valve gas that move relative to each other in the axial direction. In order to seal the gap between the id and supply the optimum amount of lubricant to the sliding parts. As an example of this, valve stem seals as shown in Figure 2 (a) and (b) are used. It is used.

0003 The valve stem seal in Figure 2 (a) has a substantially cylindrical shape and is made of rubber-like elastic material. A metal ring 6 formed of a rubber-like elastic material and a metal ring 6 having a coating on its inner circumferential surface. The metal ring 6 is attached to the cylinder head 1. It is fixed to the combined valve guide 2 and reciprocates the seal part 9 within the valve guide 2. It is made to slide on the circumferential surface of the moving valve stem 3.

0004 In the valve stem seal of FIG. 2(b), the metal ring 6 is located opposite the seal portion 9. A flange 10 is attached to the side end, showing a roughly Z-shaped cross-sectional shape, and the valve spring 4 presses the flange 10.

[0005]

[Problem that the invention attempts to solve]

The valve stem seal of FIG. 2(A) according to the conventional technology described above is simply a seal. It has only a function and has little relationship with other valve train components, The bonding force against Therefore, a special tool is required to attach it to the valve guide 2. The connection to the valve guide 2 cannot be avoided, making the process complicated. There is also a risk of power shortage.

[0006] The valve stem seal in Fig. 2 (b) connects the flange 10 at the end of the metal ring 6 to the valve stem seal. Since it is pressed by the puller 4, it is related to other valve train components. However, the problem with the ease of mounting onto the valve guide 2 remains unsolved.

[0007]

[Means to solve the problem]

The present invention takes into consideration the problems with the valve stem seals according to the conventional technology described above. With this in mind, the metal ring that is attached to the circumferential surface of the valve stem and the sliding seal is removed from the outside. It has a cylindrical part on the circumferential side and a radial part extending inward from the end of the cylindrical part, and has a substantially L-shape. The valve guide is configured to have a cross-sectional shape, and the annular recess surrounding the valve guide is configured to have a circular shape. The cylindrical part of the metal ring is inserted into the annular recess of the cylinder head to insert the cylinder head into the cylinder head. Position the valve spring inside the cylindrical part of the metal ring, and attach the radial part of the metal ring to the valve spring. It has a structure that is pressed by a ring. The fitting of the cylindrical part of the metal ring into the annular recess of the cylinder head requires interference. It is preferable to use a light loose fit without providing any.

[0008]

[Effect]

In the valve stem seal of the present invention having the structure described above, the cylinder The cylindrical part of the metal ring is inserted into the annular recess of the valve stem. The valve spring maintains the concentricity of the seal against the radial part of the metal ring. The structure that presses the valve stem seal relative to the valve guide in the axial direction Fix the position.

[0009]

【Example】

In the embodiment of FIG. 1, an annular recess 5 concentric with the valve guide 2 extends into the cylinder. A cylindrical portion 7 and a radial direction extending from one end of the cylindrical portion 7 are provided on the metal ring 6. The metal ring 6 has a substantially L-shaped cross section and is made of a rubber-like elastic material. A sealing part 9 made of The radial portion 8 is inserted into the valve spring 5 and is pressed by the valve spring 4 .

0010

[Effect of the idea]

In the valve stem seal of the present invention, as mentioned above, the valve stem seal is concentric with the valve guide. An annular recess is provided in the cylinder head and is made of a rubber-like elastic material. A metal ring having a sealing portion adhered to the inner end thereof extends from a cylindrical portion and one end of the cylindrical portion. It has an approximately L-shaped cross-sectional shape with a radial part, and the cylindrical part is shaped like the annular part of the cylinder head. The cylinder head is inserted into the recess and the radial part is pressed by the valve spring. The cylindrical part of the metal ring is inserted into the annular recess of the valve stem. The valve spring is pressed against the radial part of the metal ring while maintaining the concentricity of the ring part. The structure fixes the relative position of the valve guide and valve stem seal in the axial direction. By doing so, you can expect the following effects. Attach the valve stem seal to the valve train and assemble the valve spring. As it can be carried out at the same time as assembly, no special assembly tools are required and assembly work is easy. be converted into Insert the cylindrical part of the metal ring into the annular recess of the cylinder head and ring the radial part. The valve is assembled by contacting the radial surface of the shaped recess. This eliminates the risk of the seal portion being attached diagonally to the stem. The valve spring is inserted into the cylindrical part of the metal ring, so it is easy to assemble it. The valve spring does not shift and maintains a stable position even after assembly.

[0011]

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an example of a valve stem seal according to the prior art.

[Explanation of symbols]

1 cylinder head 2 Valve guide 3 Valve stem 4 Spring 5 Annular recess 6 Metal ring 7 Cylindrical part 8 Radial section 9 Seal part 10 flange

Claims (1)

[Scope of utility model registration request] Claim 1: A metal ring (6) having a substantially L-shaped cross-sectional shape consisting of a cylindrical part (7) and a radial part (8) extending from one end of the cylindrical part (7), and a rubber-like elastic The sealing portion (9) is molded from a material and adhered to the inner end of the metal ring (6), and slides with the circumferential surface of the valve stem (3) that reciprocates within the valve guide (2). , the cylindrical part (7) of the metal ring (6) is inserted into the annular recess (5) provided in the cylinder head (1), and the radial part (8) is pressed by the valve spring (4). valve stem seal.