JPH04117293U - rotscar cover - Google Patents

Abstract

(57) [Summary] [Purpose] In order to make the opening in the ceiling of the rocker cover and the annular oil seal concentric, the oil seal is fixed to the oil seal support, and the oil seal support is attached to the rocker by ultrasonic welding. Welded to the cover body. Furthermore, the baffle plate can be easily fixed and sealed by vibration welding. [Configuration] On the cylindrical lower surface 2c of the rocker cover body 2,
The oil seal support 4 on which the oil seal 3 is baked is ultrasonically welded. For welding, a guide jig is used to make the opening 6 and the lip portion 3a of the oil seal concentric, so that they are accurately concentric. Furthermore, vibration welding can be used for the baffle plate 5, making it possible to easily obtain an accurate product.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a synthetic resin rocker cover for an internal combustion engine.

0002

[Conventional technology]

Conventional synthetic resin rocker cover interior is divided into two upper and lower chambers, and the upper chamber is blow-byed. It is known that it is used as a gas processing chamber. For example, it was published in Utility Model Application No. 63-105712. That is what is shown. Furthermore, an opening is made in the ceiling of the rocker cover body to A pipe that is installed upright in the engine head is inserted through it, and a spark plug is inserted into the pipe. It is used. Examples are shown in FIGS. 3, 4, and 5.

0003 The rocker cover 30 is a synthetic material having an opening 32 in the ceiling part 31a and an open bottom end. Blow is applied to the resin rocker cover body 31 and the upper part of the rocker cover body 31. A baffle plate 34 that partitions the bi-processing chamber 33 and a baffle plate provided concentrically with the opening 32 are provided. An oil seal 35 is provided. Baffle plate 34 is locked with screw 36 The outer periphery 35b of the oil seal 35 is fixed to the cover body 31 with screws, and the outer periphery 35b of the oil seal 35 is attached to the rocker cover. It is press-fitted into the cylindrical portion 31b of the bar body 31 and is held therein. Annular shape at one end of the cylindrical part 31b At the part where the groove 31C and the baffle plate 34 contact the rocker cover main body 31 A sealant is applied in advance. A pipe 37 for installing a spark plug is inserted through the opening 32. As a result, the inward lip portion 35a of the oil seal 35 elastically contacts the outer periphery of the pipe 37. The rocker cover 30 is in contact with the outside air to isolate the inside of the rocker cover 30 from the outside air.

0004

[Problem that the idea aims to solve]

The inward lip portion 35a of the oil seal of the rocker cover as described above is susceptible to vibrations. In order to maintain airtightness between the pipe 37 and the pipe 37, it is necessary to It is necessary to abut with equal pressure and it is necessary to be in an exact concentric position with the opening 32 It is. To do this, the opening 32 and the inner circumference of the cylindrical portion 31b must be accurately concentric. The rocker cover body 31 must be molded. Therefore, a precision mold I need. Moreover, strict dimensional limits are required to prevent warpage and distortion that are unavoidable during molding. This increases the defect rate, and also makes it difficult to adjust the positioning of the oil seal during assembly. I can't fix it. In addition, sealant application, oil seal press-fit, and baffle during assembly. The number of man-hours involved in screwing the plate increases, leading to increased costs and wasted resources.

[0005]

[Means to solve the problem]

The rocker cover of this invention is made of a synthetic resin oil seal with an oil seal firmly attached. The rocker cover body is ultrasonically welded and integrated into the rocker cover body, and the baffle The plate is integrated into the rocker cover body by vibration welding.

[0006]

[Effect]

In this invented rocker cover, the oil seal is fixed to the oil seal support. , the oil seal support is welded to the rocker cover body by ultrasonic welding. Ultrasonic welding is performed accurately using a jig that guides the opening and the lip of the oil seal concentrically. The opening of the rocker cover body is fixed, and the amplitude during welding is extremely small. and the lip of the oil seal are fixed with accurate concentricity, and the rocker cover main The body and the oil seal support are brought into close contact to such an extent that no sealant is required. Also the bar Since the ffle plate is separate from the oil seal support, the amplitude is somewhat large. Vibration welding is possible because even slight positional deviations are allowed, making it easy to Welding provides both adhesion and sealing at the same time.

[0007]

【Example】

An example will be explained with reference to FIG. Figure 1 shows a part corresponding to part A in Figure 4. It is. The rocker cover 1 includes a rocker cover body 2 made of synthetic resin, synthetic rubber, etc. An oil seal 3 made of an elastic material, an oil seal support 4 made of synthetic resin, and a composite It is equipped with a baffle plate 5 made of synthetic resin. The rocker cover body 2 is the ceiling part 2 It has a box shape with an opening 6 at the bottom and an open bottom end. The top of baffle plate 5 is A blow-by treatment chamber 7 is formed to house an oil mist separation filter (not shown), etc. Ru. The oil seal 3 has an inward annular lip portion 3a, and an outer peripheral portion 3b has an annular shape. It is fixed by baking to the inner peripheral portion 4b of the oil seal support 4. This fixation is caused by adhesive. Adhesion may also be used. A plurality of small protrusions 4a are provided on the upper surface of the oil seal support 4. The lower surface 2c of the cylindrical portion 2b surrounding the opening 6 of the rocker cover body 2 is Welded by sonic welding. The small protrusion 4a is a welding margin and disappears after welding is completed. The upper surface of the oil seal support 4 is integrated with the lower surface 2c of the cylindrical portion 2b. Closely adheres to the bottom surface of the This welding is performed using a jig ( (not shown) and performed by an ultrasonic generator (not shown). Is Umono. The baffle plate 5 is provided with ribs 5a, which are It is vibration welded to the lower surface 2c of the cylindrical portion 2b of the rocker cover main body. Rib 5a After the welding is completed, it disappears, becomes integrated with the lower surface 2c of the cylindrical part 2b, and is fixed, forming a linear seam. will be sent. This vibration welding has a slightly larger amplitude than ultrasonic welding, and the oil seal Although it is not suitable for positioning welding of baffle plates, it is possible to obtain linear welding lines and Suitable for welding.

[0008] FIG. 2 shows another embodiment. In this example, the bottom of the cylindrical part 2b of the rocker cover body 2 is A step is provided on the surface to form lower surfaces 2d and 2e. The inner circumferential side is the upper row 2d. Then, the oil seal support 4 is ultrasonically welded. The outer circumferential side is the lower stage 2e, and the buff The plate 5 is vibration welded. The end 5b of the baffle plate 5 is an oil seal. It extends below the support body 4. There is a distance between the rib 5a for vibration welding and the end 5b. Since it requires t, this amount is overlapped below the oil seal support 4. As a result, the thickness T of the cylindrical portion 2b can be made smaller than that in FIG.

[0009]

[Effect of the idea]

The rocker cover of this invention keeps the lip of the oil seal exactly concentric with the opening. Since the pipe sag, airtightness around the pipe is maintained even when subjected to vibration. Also its position It is accurate and easy because the setting is done using an oil seal support that is ultrasonically welded. , the dimensional error tolerance of the rocker cover body can be expanded, and the baffle plate is also vibration-welded. Since fixing and sealing can be done at the same time, you can easily and easily perform accurate locking at low cost. You get a car cover.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing essential parts of an embodiment.

FIG. 2 is a sectional view showing essential parts of another embodiment.

FIG. 3 is a perspective view of the rocker cover.

FIG. 4 is a diagram showing a cross section of the rocker cover.

FIG. 5 is a sectional view showing essential parts of a conventional rocker cover.

[Explanation of symbols]

2 Rocker cover body 2b Cylindrical part 3 Oil seal 4 Oil seal support 5 Baffle plate 6 Aperture

Claims (1)

[Scope of utility model registration request] Claim 1: A ceiling portion having an opening is formed at the upper end,
A rocker cover comprising a box-shaped synthetic resin rocker cover body with an open bottom end, an oil seal having an annular inward lip concentric with the opening, and a baffle plate dividing the inside of the rocker cover body into upper and lower parts, This rocker cover is made by providing an oil seal support made of synthetic resin that is ultrasonically welded to the rocker cover body, fixing the outer periphery of the oil seal to the oil seal support, and vibration welding a baffle plate to the rocker cover body.