JPH0538460U - Sealing cap structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a sealing cap capable of sufficiently closing even a through hole having a low processing accuracy and preventing the sealing agent from protruding during press fitting. [Structure] The cooling water channel 10b is provided on the wall 10a of the cylinder head 10.
A recessed portion 10d having a diameter larger than that of the through hole 10c is formed at the peripheral portion of the outer opening of the through hole 10c formed by communicating the outside with the outside, and the peripheral end portion of the opening outside the through hole 10c is formed. The chamfered portion 10e is formed. On the other hand, the bottom part with a diameter almost equal to the through hole 10c
12a, a side surface portion 12b that extends from the peripheral edge of the bottom surface portion 12a in a substantially cylindrical shape, and a flange portion 12c that extends substantially vertically outward from the tip end side of the side surface portion 12b. 12, the sealant 14 is applied to the side surface portion 12b, and the side surface portion 12b is press-fitted into the through hole 10c.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a sealing cap that closes a through hole of a component such as an engine cylinder head to prevent leakage of water, hydraulic oil, etc. inside the component.

[0002]

[Prior Art]

 A part manufactured by casting may have a through hole which is unnecessary for the function of the part due to the structure of the mold. For example, in order to cast a cylinder head of an engine, the mold in the cooling water passage portion of the cylinder head must be connected to an external mold. Therefore, as shown in FIG. 2, the cast cylinder head 1 is formed with a through hole 1b for communicating the cooling chamber 1a with the outside, and the cooling water leaks as it is.

Therefore, a sealing agent 4 is manually applied to a sealing cap 2 having a bottom surface portion 2a having a shape substantially equal to that of the through hole 1b and a side surface portion 2b extending from the peripheral edge of the bottom surface portion 2a into a substantially cylindrical shape. It is applied by coating or the like and press-fitted into the through hole 1b to close the through hole 1b.

[0004]

[Problems to be solved by the device]

 However, if the through hole 1b is closed by the sealing cap 2 described above, the following inconvenience may occur. That is, the sealant 4 is interposed between the side surface portion 2b of the sealing cap 2 and the inner peripheral surface of the through hole 1b, but the surface roughness of the side surface portion 2b of the sealing cap 2 or the inner peripheral surface of the through hole 1b or If processing accuracy such as roundness is poor, a gap may be formed between the press-fitted sealing cap 2 and the through hole 1b, and water leakage may not be sufficiently prevented. Further, when the sealing cap 2 is press-fitted, the sealing agent 4 may peel off and stick out from the opening of the through hole 1b, and if it sticks out, it must be washed, which requires a complicated work.

Therefore, the present invention is capable of sufficiently closing even a through hole or a sealing cap that has not been processed with high precision and preventing the sealing agent from protruding during press fitting. The purpose is to provide.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a sealing cap structure according to the present invention is a sealing cap structure in which a through hole of a wall of a component is press-fitted to close the inside of the through hole. It is characterized in that it is constituted by a main body portion and a flange portion which is formed on an end surface of the main body portion and which is substantially in close contact with the wall portion when press-fitted.

[0007]

[Action]

 The main body of the sealing cap is press-fitted into the through hole of the component and pushed until the flange comes into contact with the wall surface of the component. Further, a sealant may be applied to the outer peripheral surface of the main body in advance. In this case, the press-fitting causes the sealing agent to squeeze out between the outer surface of the main body and the inner peripheral surface of the through hole.The squeezing sealing agent may be deposited on the boundary between the flange and the main body, or the flange may be removed. And the wall.

[0008]

【Example】

 Hereinafter, a sealing cap structure according to the present invention will be described with reference to the illustrated embodiments. In this embodiment, the case where the sealing cap is used for the through hole of the cylinder head of the engine has been described.

Since it is necessary to provide a cooling water passage inside the cylinder head, the mold for casting the cylinder head has a shape in which the core of the cooling water passage is connected to the outer die. Therefore, as shown in FIG. 1, the wall portion 10a of the cast cylinder head 10 is formed with a through hole 10c for communicating the cooling water passage 10b with the outside. Then, a counterbore is formed around the opening outside the through hole 10c to form a recess 10d having a diameter larger than that of the through hole 10c. Further, a chamfered portion 10e is formed on the peripheral edge of the opening outside the through hole 10c.

On the other hand, the sealing cap 12 has, as a main body portion, a bottom surface portion 12a having a diameter substantially equal to that of the through hole 10c, and a side surface portion 12b extending from the peripheral edge of the bottom surface portion 12a in a substantially cylindrical shape. Further, a flange portion 12c is formed so as to extend substantially vertically outward from the tip side of the side surface portion 12b.

When the sealing cap 12 is press-fitted into the through hole 10c, the sealing agent 14 is applied to the outer peripheral surface of the side surface portion 12b, and the sealing cap 12 is press fit into the through hole 10c. The side surface portion 12b is pushed into the inside of the through hole 10c, and the flange portion 12c is brought into close contact with the recessed portion 10d to be immersed therein. At this time, since the outer peripheral surface of the side surface portion 12b and the inner peripheral surface of the through hole 10c are substantially in contact with each other, the sealant 14 is pushed out from between them and protrudes in the direction of the flange portion 12c. The protruding sealing agent 14 is deposited in the gap between the chamfered portion 10e and the sealing cap 12.

According to this embodiment, the outer peripheral surface of the side surface portion 12b of the sealing cap 12 and the inner peripheral surface of the through hole 10c are in close contact with each other via the sealant 14, and the chamfered portion 10e of the through hole 10c is in contact. Since the sealant 14 is deposited on the inner surface of the hole 12c and the flange 12c and the recess 10d are almost in close contact with each other, the cooling water does not leak from the through hole 10c.

Further, since the protruding sealing agent 14 is deposited on the chamfered portion 10e, the sealing agent 14 is prevented from protruding from the edge of the flange 12c onto the surface of the wall 10a.

Further, since the collar portion 12c is recessed in the recessed portion 10d, the collar portion 12c itself does not obstruct the surface of the wall portion 10a. Moreover, when the sealing cap 12 is press-fitted, the collar portion 12c may be press-fitted in accordance with the position of the recessed portion 10d, so that the driving tool and the positioning work can be simplified and the precision of the press-fitted state can be improved. be able to.

In the present embodiment, the sealing agent 14 is applied by hand coating or the like to the sealing cap 12 and then press-fitted. However, a sealing agent coated on the surface of the sealing cap 12 in advance may be used. Absent. In this case, it is not necessary to apply the sealing agent in the assembly line, so that the assembly work can be speeded up.

[0016]

[Effect of the device]

 As described above, according to the sealing cap structure of the present invention, since the flange portion is substantially in close contact with the wall surface around the through hole, only between the outer peripheral surface of the main body portion and the inner peripheral surface of the through hole. In addition, the collar portion and the wall surface are also in close contact with each other. Therefore, even when the liquid is flowing inside the component, the liquid is not leaked because the through hole is surely closed.

When a sealant is applied to the outer peripheral surface of the main body of the sealing cap and press-fitted, the sealant protruding by the press-fitting is deposited on the boundary between the collar and the main body, or the collar is pressed. Since it is interposed between the wall and the wall, the sealant does not stick out on the wall. For this reason, the work of cleaning the protruding sealing agent is not necessary, and the assembly work can be speeded up.

[Brief description of drawings]

FIG. 1 is a partially omitted sectional view showing a state in which a sealing cap is press-fitted into a through hole of a cylinder head.

FIG. 2 is a partially omitted sectional view showing a state where a conventional sealing cap is press-fitted into a through hole of a cylinder head,
It corresponds to FIG.

[Explanation of symbols]

 10 Cylinder head 10a Wall part 10c Through hole 12 Sealing cap 12a Bottom part 12b Side part 12c Collar part 14 Sealant

Claims (1)

[Scope of utility model registration request] 1. A structure of a sealing cap which is press-fitted into a through hole of a wall portion of a component and closes the through hole, wherein a main body portion that closes the inside of the through hole and an end face of the main body portion is formed and press-fitted. A sealing cap structure comprising: a flange portion that substantially comes into close contact with the wall portion at the time of.