JPH0217169Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a head cover seal structure for an engine.

(Prior Art) Conventionally, as a structure for sealing the cylinder head of an engine and a head cover that covers a cam cap that supports a camshaft, a seal groove is provided around the entire bottom of the head cover, and an O-ring-shaped seal member is installed in the seal groove. There is a structure in which the cylinder head is fitted with a seal member and the tip of the seal member is brought into contact with the seal surface of the cylinder head to achieve a seal. Also, Jitsukō 56-44957
As shown in the above publication, there is a structure in which a separate member is provided on the head cover and a sealing member is sandwiched between the separate member and the head cover for sealing. In order to prevent the seal member from shifting in both of the above cases, in the former case, the seal member is fitted into the seal groove, and in the latter case, the seal member is sandwiched between the head cover and another member. It was made in

(Problems to be solved by the invention) On the other hand, engines are being made lighter and more compact in many ways, and head covers are also being made lighter and more compact. Further, in the case of the head cover, there is a manufacturing problem in that it cannot be removed from the mold unless a draft angle is taken, and since the head cover is sloped from the top to the bottom, the space inside the head cover becomes increasingly scarce. As a result, the head cover and the end face of the cam cap in the engine width direction interfere with each other, making it difficult to attach the head cover.

Therefore, in the former conventional structure, in order to make it more compact and to prevent interference with the cam cap, there is a
It is conceivable to attach the head cover to the cylinder head by providing a notch in a portion of the cam cap that faces the end surface in the engine width direction so as to open the cam cap in the direction of the cam cap. However, in that case, a problem arises in that the sealing member is displaced in the notch, resulting in poor sealing performance.

The present invention solves the above-mentioned problems, and aims to reduce the weight and size, prevent interference with the cam cap, and prevent misalignment of the seal member and deterioration of sealing performance.

(Means for Solving the Problems) In order to achieve the above object, the solution means of the present invention is such that a cam cap that supports a camshaft and extends in the width direction of the engine is fixed on the cylinder head, and a head cover that covers the cam cap is fixed to the cylinder head. It is fastened and fixed to the cylinder head, and the head cover and cylinder head are connected by an O-ring-shaped sealing member fitted in a sealing groove provided all around the bottom of the head cover, so that the tip of the sealing member touches the sealing surface of the cylinder head. This assumes an engine head cover seal structure that is sealed by contact. A notch is provided on the inner side wall of both side walls constituting the seal groove so as to open a portion facing both end surfaces of the cam cap in the engine width direction toward the cam cap. . On the other hand, the seal member is formed with a bulge that bulges inward so as to close the notch, and the bulge portion of the seal member is connected to the end surface of the cam cap in the engine width direction. It is assumed that it is held between the outer side wall of the seal groove.

(Function) Accordingly, in the present invention, the bulging portion of the seal member is held between the end face of the cam cap in the engine width direction and the outer side wall of the seal groove of the head cover, thereby preventing the seal member from slipping. .

Furthermore, by providing a notch in the inner side wall of the seal groove of the head cover that opens toward the cam cap, the notch serves as a positioning tool when inserting the sealing member provided with the bulge.
The sealing member can be inserted without any excess.

Further, the deterioration of the sealing performance of the notch caused by providing the notch can be prevented by increasing the sealing surface with the bulge and the cam cap.

(Effect of the invention) Therefore, according to the invention, a notch is provided in the inner side wall of the seal groove of the head cover so as to open the part facing the end face of the cam cap in the engine width direction in the direction of the cam cap. established,
A bulge is provided on the seal member to close the notch, and the bulge portion of the seal member is held between the cam cap and the head cover, thereby preventing the seal member from shifting and ensuring sealing performance. In addition, if the head cover is made of a material that is prone to warping, such as resin, the warping can be observed. Furthermore, the notch, which opens one inner wall of the recess toward the cam cap, can be used for positioning when inserting the sealing member without deteriorating its sealing performance, making insertion of the sealing member easier. can be achieved.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. 1, 2, and 3 show an embodiment of the present invention, in which 1 is a camshaft, which is supported by a cam cap 2 extending in the width direction of the engine. The cam cap 2 is fixed onto the cylinder head 3 via bolts 4. Further, a head cover 5 that covers the cam cap 2 is fastened and fixed onto the cylinder head 3 via bolts 6. The head cover 5 is sealed against the sealing surface 7 of the cylinder head 3 by a sealing member 8. The sealing member 8 is fitted into a sealing groove 9 provided all around the bottom of the head cover 5, and seals by bringing its tip into contact with the sealing surface 7 of the cylinder head 3. A notch 11 is provided in the inner side wall 10 of the seal groove 9 so as to open a portion facing the end face of the cam cap 2 in the engine width direction toward the cam cap 2. As shown in FIG. On the other hand, the seal member 8 is formed with a bulge 12 that bulges inward so as to close the notch 11 . The bulging portion 12 of the seal member 8 is sandwiched between the end face of the cam cap 2 in the engine width direction and the outer side wall 13 of the seal groove 9 of the head cover 5. In addition,
In this embodiment, the bulging portion 12 is extended above the seal groove 9, but instead of extending the bulging portion 12 above the seal groove 9, the sealing member 8 is simply bulged laterally. A configuration may also be adopted in which a projecting portion 12 is provided and a portion of the projecting portion 12 of the seal member 8 is held between the cam cap 2 and the outer side wall 13 of the seal groove 9.

Therefore, as in the above structure, by sandwiching the bulging portion 12 between the end face of the cam cap 2 in the engine width direction and the outer side wall 13 of the seal groove 9 of the head cover 5, the seal member 8 is prevented from slipping. , it is possible to ensure sealing performance. Furthermore, in the case of the head cover 5 made of a material that is prone to warping, such as resin, the swelling can be suppressed by the bulging portion 12. Particularly, as shown in FIG. 2, the effect is further enhanced by locating the bulging portion 12 in a flexible portion between the bolt 6 and the bolt 6 which is not directly tightened.

Furthermore, in the past, when the seal member 8 was made of an elastic body, there was a problem in that the seal member 8 was left over depending on how it was installed, and the seal member 8 had to be reinstalled. By providing a notch 11 in the inner side wall 10 of the seal groove 9 that opens toward the cam cap 2, the notch 11 can be used to position the seal member 8 provided with the bulge 12 when inserted. Therefore, the seal member 8 can be inserted completely. Furthermore, deterioration of the sealing performance at the notch 11 caused by providing the notch 11 can be prevented by increasing the sealing surface between the bulge 12 and the end face of the cam cap 2 in the engine width direction. , the sealing performance at the notch portion 11 can be improved.

[Brief explanation of drawings]

Fig. 1 is an enlarged cross-sectional view of the main parts of an embodiment of the present invention, Fig. 2 is a plan view of the head cover seen from below, and Fig. 3 is a plan view of the head cover as seen from below.
The figure is an enlarged view showing a state in which a sealing member provided with a bulging portion is inserted. 1...Camshaft, 2...Cam cap, 3
...Cylinder head, 5...Head cover, 7...
... Seal surface, 8 ... Seal member, 9 ... Seal groove, 10 ... Inner side wall, 11 ... Notch part,
12...Bulging portion, 13...Outer side wall.

Claims (1)

[Claims for Utility Model Registration] A cam cap that supports the camshaft and extends in the width direction of the engine is fixed on the cylinder head,
A head cover that covers the cam cap is fastened and fixed to the cylinder head, and the head cover and cylinder head are connected to each other by an O-ring-shaped seal member fitted in a seal groove provided all around the bottom of the head cover. In an engine head cover seal structure in which the seal is sealed by contacting the seal surface of the cylinder head, the inner side wall of both side walls constituting the seal groove is provided with both end surfaces of the cam cap in the engine width direction. A notch is provided to open the opposing portion toward the cam cap, and the seal member is provided with a bulge that bulges inward to close the notch. A head cover seal structure for an engine, wherein the bulging portion of the seal member is held between an end face in the engine width direction of the cam cap and an outer side wall of the seal groove.