JP2005337151A - Sealing device of cylinder head cover and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device of a cylinder head cover capable of sealing between a part inserted into the cylinder head cover of an internal combustion engine and a part insertion port provided in the cylinder head cover for it and being easily handled and having a simple structure, excellent productivity, and excellent sealing property, and to provide its manufacturing method. <P>SOLUTION: A sealing member composed of an annular supporting part and a seal lip part provided at its inner periphery is mounted around the part insertion port of the cylinder head cover and between the cylinder head cover and a lower face of the cylinder head cover. A plate member is fixed to the cylinder head cover by vibration welding, and the sealing member is fixed to the plate member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sealing device for a component insertion portion in a cylinder head cover of an engine such as an automobile, and a method for manufacturing the same.

Conventionally, in an internal combustion engine, a plug tube is mounted on a cylinder head to form a cylindrical hole for inserting a spark plug. At that time, when the cylinder head cover is formed so as to cover almost the entire upper portion of the cylinder head, the plug tube is provided in the cylinder head cover and opened to the outside.
In such a configuration, a plug tube seal is usually mounted between the plug tube and the cylinder head cover in order to seal the scattered oil in the cylinder head cover to the outside.

In this type of conventional plug tube sealing device, there is an apparatus in which a seal is integrally formed with a baffle plate and then fixed to a cylinder head cover via the baffle plate (see, for example, Patent Document 1).
No. 7-52357

However, it is difficult to mold a plurality of seals on a large baffle plate. Even if it is molded, the baffle plate is large, so the number of molds is reduced in space compared to molding a single seal, and productivity is also increased. bad. Also, care must be taken when handling the product after molding, and there is a high possibility that problems will occur in the method of protecting the sealing surface of the seal and the packaging of the product.
Further, when the baffle plate is made of resin, there is a concern that thermal deformation may occur during integral molding with the seal.

Also, in the conventional plug tube seal device, the oil seal is composed of an annular support body and an inner periphery seal body, and is fixed by vibration welding to the cylinder head cover, and then the baffle plate is further vibration welded to the cylinder head cover. There are some that are fixed (see, for example, Patent Document 2).
Japanese Patent No. 2920729 (FIG. 1)

However, in this type of equipment, it is necessary to fix the oil seal first and then the baffle plate at the time of manufacture. Therefore, it is necessary to fix it twice, so that the assembly workability is poor and there is a problem in manufacturing efficiency. It was.
Further, in addition to the plug tube, parts such as an injector and a glow plug may be inserted into the cylinder head cover. In such a case, there is a risk of causing the same problem.

An object of the present invention is to provide a cylinder head cover sealing device that seals between a part inserted into a cylinder head cover of an internal combustion engine and a part insertion port provided in the cylinder head cover for solving the above problem. And
The present invention also provides a method for manufacturing a cylinder head cover sealing device that seals between a component inserted into a cylinder head cover of an internal combustion engine and a component insertion port provided in the cylinder head cover. The purpose is to do.

  For this purpose, the sealing device of the present invention is configured such that a sealing member comprising a reinforcing ring or an annular support portion and a seal lip portion provided on the inner periphery thereof is connected to the cylinder head cover and the cylinder around the part insertion port of the cylinder head cover. Mounted between the plate member mounted on the inner surface side of the head cover, the seal member and the plate member are placed at the assembly position of the cylinder head cover, and the plate member is fixed to the cylinder head cover by vibration welding of the plate member. In addition, the seal member is fixed to the plate member by this vibration welding.

  In the present invention, the seal member, the cylinder head cover, and the plate member are respectively molded separately and then combined together, and the seal member, the cylinder head cover, The sealing member and the plate member can be mounted and fixed by one-time welding, and excellent work efficiency can be obtained in the manufacturing process. In addition, the manufacture and management of the seal member, which requires attention for the integral molding with the conventional plate member, is much easier because it is managed and assembled with separate parts in this application. Since the sealing member is securely attached and the sealing performance is maintained by welding, the sealing performance with the plate member is improved.

  Further, since the mounting position of the seal member with respect to the cylinder head cover is determined at the time of assembly, the assembly position accuracy is increased, and the sealing performance of the seal lip with respect to the parts inserted into the cylinder head cover is further improved.

  Further, for positioning at the time of combination, irregularities that fit each other may be formed continuously or discontinuously between the cylinder head cover and the seal member. As a result, the position of the seal member relative to the cylinder head cover is more reliably determined, so that the assembly position accuracy is increased and the sealing performance of the lip is improved.

Furthermore, for the above purpose, in the present invention, in a method of manufacturing a cylinder head cover sealing device for sealing between a part inserted into a cylinder head cover of an internal combustion engine and a part insertion port provided for the cylinder head cover, a reinforcing ring is provided. Alternatively, a seal member composed of an annular support portion and a seal lip portion provided on the inner periphery thereof may be a cylinder head cover and a plate member attached to the inner surface of the cylinder head cover around the component insertion port of the cylinder head cover. After mounting the seal member on the cylinder head cover and placing the plate member thereon, the plate member is fixed to the cylinder head cover by vibration welding of the plate member, and the seal member is fixed to the plate member. Manufacture a sealing device.
According to this manufacturing method, since the individually molded parts of the sealing device are fixed by one-time welding, it is possible to obtain a sealing device that is easier and easier to manufacture than the conventional one, and has high sealing performance.

  Embodiments of a cylinder head cover sealing device according to the present invention will be described below in more detail with reference to the drawings.

FIG. 1 shows a sectional view of a first embodiment in which a cylinder head cover sealing device according to the present invention is applied to a plug tube seal.
The cylinder head cover 1 having a shape covering the cylinder head of the internal combustion engine is provided with an opening 1a, and a plug tube 3 for the spark plug protrudes through the opening 1a. Further, a plug tube seal 4 is accommodated in a step 11 provided around the inside of the opening 1a, and a baffle plate 2 is mounted on the inner surface side of the cylinder head cover 1, that is, the lower surface in the figure. A cylinder head cover 1 and a baffle plate 2 are mounted.

By performing vibration welding of the baffle plate 2 in the mounted state, the plug tube seal 4 and the baffle plate 2 and the cylinder head cover 1 and the baffle plate 2 are joined and fixed, respectively, and the plug tube seal device is integrally formed. ing.
The plug tube 3 in the opening 3 of the cylinder head cover 1 is sealed by joining the plug tube seal 4 and the baffle plate 2 and sealing the plug tube seal 4 and the plug tube 3.

  In this embodiment, the step portion 11 is provided on the cylinder head cover 1, but the plug tube seal 4 is sandwiched between the cylinder head cover 1 and the baffle plate 2 without being provided with the step portion 11. Also good.

  Further, this embodiment will be described in detail. As shown in FIG. 2 which is a partially enlarged sectional view of FIG. 1, the plug tube seal 4 includes an annular support portion 5 as a reinforcing ring and a variation of the plug tube 3 on the inner periphery thereof. It is comprised from the seal lip | rip part 6 inclined and provided in order to follow and absorb. The reinforcing ring 5 is normally refracted downward to adjust the protrusion of the seal lip portion 6 upward. However, if there is no problem with the protrusion of the lip portion 6, as shown in the modified example of FIG. The reinforcing ring 5 ′ may extend horizontally without being refracted. 2 is embedded with a spring 10 for tightening the plug tube 3 in order to increase the sealing performance, but a non-embedded spring 10 'may be used as shown in FIG.

  The reinforcing ring 5 is formed of a synthetic resin such as 6.6 nylon, but is not limited thereto, and the seal lip portion 6 is formed of a rubber-like elastic body such as acrylic rubber.

  Further, as shown in FIG. 2, an annular protrusion 7 having a pointed end is provided on the lower surface of the reinforcing ring 5 and is brought into contact with the baffle plate 2 at the pointed end of the protruding part 7, so that the reinforcing ring 5 and the baffle plate 2 By reducing the contact area between them, the contact force per unit area is increased and the welding is surely facilitated.

  Further, in the cylinder head cover 1 and the plug tube seal 4, as the unevenness shown in the figure, a positioning protrusion 8 is provided continuously or discontinuously on the peripheral upper surface of the reinforcing ring 5, and a recess corresponding to the protrusion 8 is provided in the cylinder head cover 1. 9 is provided. These are fitted to facilitate positioning of the cylinder head cover 1 and the plug tube seal 4 during assembly. The protrusions 8 and the recesses 9 may be provided on the cylinder head cover 1 and the reinforcing ring 5 in reverse to the above.

  Next, a manufacturing method of the plug tube sealing device according to the present invention will be described with reference to the drawings.

The sealing device shown in FIG. 1 to FIG. 2 is upside down from the direction at the time of manufacture.
First, the cylinder head cover 1 having a shape covering the cylinder head of the internal combustion engine is placed with the stepped portion 11 facing upward. A plug tube seal 4 for sealing and holding the plug tube 3 is placed on the stepped portion 11. At this time, when the cylinder head cover 1 and the plug tube seal 4 are provided with the recesses 9 and the protrusions 8 for fitting, respectively, they can be easily assembled and the positions thereof are precisely set. it can. Although the cross sections of the protrusions 8 and the recesses 9 in the present embodiment are shown as rectangles, suitable shapes such as circles and triangles can be applied depending on the positioning and assembly thereof.
Thereafter, the baffle plate 2 is placed on the cylinder head cover 1, and the plug tube seal 4 is attached between the cylinder head cover 1 and the baffle plate 2.

  Then, the baffle plate 2 is vibrated, and the baffle plate 2 and the cylinder head cover 1 and the baffle plate 2 and the plug tube seal 4 are welded and fixed by the vibration. At that time, as shown in the figure, an annular protrusion 7 having a pointed portion is provided on the periphery of the plug tube seal 4 at the contact portion with the baffle plate 2 to reduce the contact area during vibration bonding and increase the contact pressure. Also, welding can be made easier and more reliable. A suitable shape such as a circle, an ellipse, a rectangle, or the like can be applied to the cross-section of the annular protrusion 7 so that the welding is advantageous. Conversely, the annular protrusion 7 may be provided on the baffle plate 2 side.

  Depending on the workability at the time of assembly, the cylinder head cover 1 can be fixed by reversing the vertical direction of the cylinder head cover 1 and attaching the plug tube seal 4 and the baffle plate 2 using a jig or the like, and performing vibration welding. It is.

  By the above manufacturing method, the present invention has an excellent effect that a plug tube sealing device having high sealing performance and a simple structure can be manufactured easily and with good workability.

  Although the above description has been made with respect to the embodiments, the present invention is not limited thereto, and various changes and modifications can be made within the scope of the claims.

1 shows a cross-sectional view of one embodiment of a plug tube sealing device according to the present invention. FIG. 2 shows a partially enlarged sectional view of the embodiment of FIG. A modification of the embodiment of FIG. 1 is shown.

Explanation of symbols

1 Cylinder head cover 1a Opening 2 Baffle plate (plate member)
3 Plug tube (inserted parts)
4 Plug tube seal (seal member)
5, 5 'Reinforcement ring 6, 6' Seal lip 7 Protrusion 8 Positioning protrusion 9 Recess 10 Spring 11 Step

Claims (4)

In a cylinder head cover sealing device for sealing between a part inserted into a cylinder head cover of an internal combustion engine and a part insertion port provided in the cylinder head cover for that purpose,
A seal member composed of an annular support portion and a seal lip portion provided on the inner periphery thereof is provided between the cylinder head cover and a plate member mounted on the inner surface of the cylinder head cover around the part insertion port of the cylinder head cover. Attach to
A cylinder head cover sealing device having a configuration in which the plate member is fixed to the cylinder head cover by vibration welding of the plate member and the seal member is fixed to the plate member.   The sealing device according to claim 1, wherein the cylinder head cover and the sealing member are respectively provided with unevenness for positioning.   3. The sealing device according to claim 1, wherein the sealing device is used as a plug tube seal for sealing between a spark plug insertion port provided in a cylinder head cover and a spark plug. In a manufacturing method of a cylinder head cover sealing device for sealing between a part inserted into a cylinder head cover of an internal combustion engine and a part insertion port provided in the cylinder head cover for that purpose,
(1) A seal member composed of an annular support portion and a seal lip portion provided on the inner periphery thereof is mounted around the component insertion port of the cylinder head cover,
(2) Further, a plate member is mounted on the inner surface of the cylinder head cover, and the seal member is mounted between the cylinder head cover and the plate member,
(3) A method of manufacturing a cylinder head cover sealing device, wherein the plate member is fixed to the cylinder head cover by vibration welding of the plate member, and the seal member is fixed to the plate member.

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