JPH04117108U - valve stem seal - Google Patents

Abstract

(57) [Summary] [Purpose] A structure that controls the supply of lubricating oil to the sliding parts in an appropriate amount to suppress the accumulation of valve stem deposits and excessive consumption of lubricating oil. [Structure] A metal ring is formed of a rubber-like elastic material on the inner surface and has a substantially L-shaped cross-sectional shape, consisting of a cylindrical part and a radial part extending from one end of the cylindrical part, and has an annular retaining groove and an engaging groove. A seal ring molded from a gasoline-resistant and abrasion-resistant synthetic resin material to which a liner with protrusions is bonded is inserted into the retaining groove, and the engaging protrusions are attached to the tip of the valve guide. The seal ring is coupled to an engagement groove provided on an outer circumferential surface, and is configured to cause the seal ring to slide with the circumferential surface of a valve stem that reciprocates within the valve guide.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to valve stem seals used in engine valve train systems. In particular, seizure of sliding parts, large valve stem deposits, large amounts of lubricating oil, etc. This paper presents a structure of a valve stem seal that does not involve volume consumption.

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 appropriate amount of lubricating oil to the sliding parts. A valve stem seal, an example of which is shown in FIG. 2, is used.

0003 The valve stem seal in Fig. 2 has a substantially cylindrical shape and is coated with a rubber-like elastic material. A metal ring 11 is formed on the inner circumferential surface of the metal ring 11, and the metal ring 11 is molded from a rubber-like elastic material. It has a sealing lip 12 glued to the end and joins the metal ring 11 to the cylinder head. The sealing lip 12 is connected to the upper end of the valve guide 1, and the sealing lip 12 is connected to the upper end of the valve guide 1. The valve stem 2 slides on the circumferential surface of the valve stem 2, which reciprocates within the valve stem.

0004

[Problem that the invention attempts to solve]

The valve stem seal according to the above-mentioned conventional technology is located at the upper end of the valve guide 1. (oil supply side), so an appropriate amount of lubricating oil is applied to the valve stem 2 and seal lip. Valve guide 1 and valve stem 2 are slid by passing through the sliding part of valve 12. The valve stem 2 and the seal must be supplied under all conditions. Optimal control of the amount of lubricant that passes through the sliding part of lip 12 is important. It was extremely difficult.

[0005] As a means to solve the above-mentioned problems with conventional valve stem seals. Therefore, the HBT type seal shown in Fig. 3 was devised. The HBT type seal shown in the figure is an annular seal provided on the inner surface of the tip of the valve guide 1. Inside the mounting groove 13, a synthetic resin material with gasoline resistance and abrasion resistance is molded. A sealed seal ring 14 and an O-ring 15 molded from a rubber-like elastic material are arranged. and then apply the seal ring 14, which is biased by the O-ring 15, onto the circumferential surface of the valve stem 2. It's moving.

[0006] The HBT type seal shown in FIG. 3 described above is attached to the tip of the valve guide 1. By this, the lubricant is applied to the sliding parts of the valve guide 1 and the valve stem 2. Although the supply is secured, the machining work of the mounting groove 13 and the installation of the seal ring 14 and O-ring 15 are difficult. There remains the problem that it is difficult to insert it into the groove 13.

[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. In consideration of this, a substantially L-shaped section is formed of a cylindrical portion and a radial portion extending from one end of the cylindrical portion. An annular retaining groove is formed by molding a rubber-like elastic material onto the inner surface of a metal ring that has a planar shape. A liner with engaging protrusions formed thereon is adhered to provide gasoline resistance and abrasion resistance. A seal ring molded from the synthetic resin material obtained is inserted into the retaining groove, and The engagement protrusion is coupled to the engagement groove provided on the outer circumferential surface of the tip of the valve guide, and the The ring slides against the circumferential surface of the valve stem that reciprocates within the valve guide. The configuration is such that it can be used.

[0008]

[Effect]

In the valve stem seal of the present invention having the structure described above, the valve guide The engagement groove provided on the outer circumferential surface of the tip of the metal ring and the engagement protrusion formed on the inner surface of the metal ring The coupling structure provides an easy assembly process and a strong coupling of the valve train, and the system The structure in which the ring is attached to the tip of the valve guide connects the valve stem and valve. Provides a reliable supply of lubricant to the sliding parts of the guide.

[0009]

【Example】

In the embodiment of FIG. 1, the cylindrical portion and the radial portion extending from one end of the cylindrical portion A rubber-like elastic material is provided on the inner surface of the metal ring 3, which has a substantially L-shaped cross-sectional shape. A molded liner 4 with an annular retaining groove 5 and an inward engaging protrusion 6 is adhered. Seat made from synthetic resin material with gasoline resistance and abrasion resistance. The ring 7 is inserted into the holding groove 5, and the engagement protrusion 6 is inserted outside the tip of the valve guide 1. The seal ring 7 is coupled to the engagement groove 8 formed on the circumferential surface of the valve stem 2. It is configured to move.

0010

[Effect of the idea]

In the valve stem seal of the present invention, as described above, the cylindrical portion and the cylindrical portion The inner surface of a metal ring that has a radial portion extending from one end and has an approximately L-shaped cross-sectional shape. The lug is molded from a rubber-like elastic material and has an annular retaining groove and an engaging protrusion. The inner is bonded and is made of synthetic resin material that is gasoline resistant and abrasion resistant. A shaped seal ring is inserted into the retaining groove, and the engaging protrusion engages the valve guide. The seal ring is coupled to an engagement groove provided on the outer circumferential surface of the tip of the valve. It has a structure that slides with the circumferential surface of the valve stem that moves back and forth within the valve guide. By doing so, the following effects can be expected. Insert the inner surface of the metal ring into the engagement groove provided on the outer peripheral surface of the tip of the valve guide. The connection structure by inserting the engagement protrusion allows for easy assembly and strong connection of the valve train. bring. The structure in which a seal ring is attached to the tip of the valve guide is the valve stem. This ensures a reliable supply of lubricant to the sliding parts of the valve guide. Seizure of moving parts and accumulation of large valve deposits are prevented, and excessive lubricating oil is prevented. Consumption is suppressed.

[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.

FIG. 3 is a cross-sectional view of a partially improved valve stem seal.

[Explanation of symbols]

1 Valve guide 2 Valve stem 3 Metal ring 4 liner 5 Retaining groove 6 Engagement protrusion 7 Seal ring 8 Engagement groove 11 Metal ring 12 Seal lip 13 Mounting groove 14 Seal ring 15 O-ring

Claims (1)

[Scope of utility model registration request] Claim 1: A metal ring (3) formed of a rubber-like elastic material and formed with a rubber-like elastic material on the inner surface of a metal ring (3), which is composed of a cylindrical part and a radial part extending from one end of the cylindrical part and has an approximately L-shaped cross-sectional shape. A seal ring (7) made of a synthetic resin material with gasoline resistance and abrasion resistance, to which a liner (4) with a retaining groove (5) and an engaging protrusion (6) is attached.
is inserted into the retaining groove (5), and the engaging protrusion (6)
of a valve stem (2) which is coupled to an engagement groove (8) formed on the outer peripheral surface of the tip of the valve guide (1) and reciprocates the seal ring (7) within the valve guide (1). A valve stem seal that slides against the surrounding surface.