JP2006090344A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device eliminating work for applying liquid gasket on a mating surface of the bearing cap 2 and enabling to use an oil seal 4 of a type not including an outer circumference seal part in the sealing device fixing a bearing cap 2 on a housing 1 to form a bore shape shaft insertion space 3 and fixing the oil seal 4 on a circumference edge part of the shaft insertion space 3 making the same slidably and closely contact a circumference surface of the shaft 5. <P>SOLUTION: Gasket retention grooves 9, 10, 11 are formed on a mating surface of the housing and the oil seal 4, a mating surface of the bearing cap 2 and the oil seal 4, and a mating surface of the housing 1 and the bearing cap 2. Liquid gasket is filled in the gasket retention groove 9, 10, 11 to seal each mating surface. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sealing device, and more particularly to a sealing device suitable for being used as an engine seal.

  Conventionally, as shown in FIG. 7, a bearing cap 52 is fixed to a housing (engine cylinder block) 51 to form a hole-shaped shaft insertion space 53, and an oil seal 54 is fixed to a peripheral portion of the shaft insertion space 53. In addition, a sealing device (engine seal) is known that is slidably in close contact with the peripheral surface of a shaft (crankshaft) 55 (see Patent Document 1).

  The shaft insertion space 53 is formed in a halved shape in the housing 51 and the bearing cap 52, and is formed in a hole shape that surrounds the entire circumference by combining both 51 and 52. Further, as shown in FIG. 8 in an enlarged manner, the oil seal 54 is formed by attaching a rubber-like elastic body 57 to a metal ring 56, and slides on the peripheral surface 55 a of the shaft 55 on this rubber-like elastic body 57. A seal lip 58 that seals the part freely and closely and an outer peripheral seal part 59 that seals the part in close contact with the inner peripheral wall 53a of the shaft insertion space 53 are integrally formed. In FIG. 7, reference numeral 60 denotes an oil pan.

  However, in the above prior art, as shown in FIG. 9, a liquid gasket (liquid packing) 61 is provided on the mating surfaces 52a and 52b of the bearing cap 52 so that oil does not leak from the mating surfaces of the housing 51 and the bearing cap 52. It is fixed after applying. The mating surfaces 52a and 52b are planar, and an appropriate amount of liquid gasket 61 is applied to the planar mating surfaces 52a and 52b. Therefore, since this application work requires a little labor and skill, it is desired to omit it if possible.

  Further, the mating surfaces of the housing 51 and the oil seal 54 and the mating surfaces of the bearing cap 52 and the oil seal 54 are sealed by the outer peripheral seal portion 59 of the oil seal 54 as described above. Therefore, there is a disadvantage that the types of usable oil seals 54 are limited to those having the outer peripheral seal portion 59.

JP 2000-186501 A

  In view of the above, the present invention can omit the operation of applying a liquid gasket to the mating surface of the bearing cap, and can also use a type of oil seal that does not have an outer peripheral seal portion. The purpose is to provide.

  In order to achieve the above object, a sealing device according to claim 1 of the present invention has a bearing cap fixed to a housing to form a hole-shaped shaft insertion space and an oil seal fixed to a peripheral portion of the shaft insertion space. In a sealing device that is slidably in close contact with the peripheral surface of the shaft, a gasket holding groove is formed on the mating surface of the housing and the oil seal, the mating surface of the bearing cap and the oil seal, and the mating surface of the housing and the bearing cap. The mating surfaces are sealed by injecting a liquid gasket into the gasket holding groove.

  The sealing device according to claim 2 of the present invention is the sealing device according to claim 1, wherein when the oil seal is an oil seal with a retainer flange, the retainer flange and the mating surface of the housing end surface, the retainer flange, A gasket holding groove is formed on the mating face of the bearing cap end face.

  As in the sealing device according to claim 1 of the present invention having the above-described configuration, gasket holding grooves are formed on the mating surface of the housing and the oil seal, the mating surface of the bearing cap and the oil seal, and the mating surface of the housing and the bearing cap. If each of the mating surfaces is sealed by injecting the liquid gasket into the gasket holding groove, the liquid gasket injecting operation is performed in place of the above-described conventional application operation, which is compared with the former application operation. Since the latter injection work is an operation after assembling the parts, it does not require much labor and skill. Also, even if the oil seal is of a type in which the metal ring is directly attached to the mating material, a gasket holding groove is formed in the metal ring or the mating material, and a liquid gasket is injected to seal the metal ring and the mating material. It becomes possible to do.

  The gasket holding groove is generally provided on the outer peripheral surface of the metal ring in the oil seal or on the inner peripheral wall of the shaft insertion space facing the metal ring, but when the oil seal has a retainer flange, As described above, it may be provided on the mating surface of the retainer flange and the housing end surface and on the mating surface of the retainer flange and the bearing cap end surface. In this case, the same effect as in the first aspect can be achieved.

  The present invention has the following effects.

  That is, according to the sealing device according to claim 1 of the present invention, in accordance with the above description, since the liquid gasket injection operation is performed instead of the conventional application operation, labor and skill can be omitted. Can be improved. Even if the oil seal is of a type in which the metal ring is directly attached to the mating member, it can be used.

  Further, according to the sealing device according to claim 2 of the present invention, even if the oil seal has a retainer flange, the same effect as that of claim 1 can be obtained.

  The present invention includes the following embodiments.

Constitution···
(1) The outer periphery of the oil seal is a metal type.
(2) A groove serving as a passage for the liquid gasket is formed in the pressure contact portion between the oil seal and the mating housing.
(3) The groove is connected to the groove provided on the mating surface of the bearing cap.
(4) A nozzle port for injecting a liquid gasket into the groove is provided.
(5) The liquid gasket is preferably in the form of a liquid or gel and solidified after filling in consideration of filling into the groove and fullness in the groove.
(6) An air vent opening is set at the end of the groove, and an orifice is attached to improve the filling property.
(7) The thickness of the metal ring is set to 0.8 mm or more so that the outer peripheral portion of the seal is not deformed by the gasket injection pressure.
(8) As another embodiment, there is an oil seal with a retainer flange, but the groove is set on the housing end surface or the retainer flange surface. A similar effect can be obtained by connecting the groove to the housing split surface.

effect···
According to the above configuration, the gasket application after the oil seal press-fitting is not required to apply the gasket to the conventional bearing cap portion, and the assembly process can be simplified. By injecting the gasket into the groove, unnecessary gasket protrusion can be prevented, and the gasket can be saved. This eliminates the need for rubber on the outer periphery of the oil seal, thus saving material.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a front view of a sealing device according to an embodiment of the present invention. 2 is a perspective view of a single bearing cap used in the sealing device, and FIG. 3 is an enlarged sectional view taken along line AA in FIG.

  In the sealing device according to this embodiment, a bearing cap 2 is fixed to a housing (engine cylinder block) 1 to form a hole-shaped shaft insertion space 3, and an oil seal 4 is fixed to a peripheral portion of the shaft insertion space 3. A sealing device (engine seal) that is slidably brought into close contact with the peripheral surface of a shaft (crankshaft) 5, and only a seal lip 8 is used as an oil seal 4 by a rubber-like elastic body 7 attached to a metal ring 6. There is used a type in which the metal ring 6 is directly attached to the mating material (housing 1 and bearing cap 2) without the outer peripheral seal portion.

  Further, as a mating surface of the housing 1 and the oil seal 4, a first gasket holding groove 9 is provided over the entire length in the circumferential direction on the inner peripheral wall 1a of the housing 1 in which the metal ring 6 of the oil seal 4 is fitted. ing. A second gasket holding groove 10 is provided on the inner peripheral wall 2a of the bearing cap 2 where the metal ring 6 of the oil seal 4 is fitted as a mating surface between the bearing cap 2 and the oil seal 4 over the entire length in the circumferential direction. Is provided. Further, as the mating surface of the housing 1 and the bearing cap 2, the mating surface of the bearing cap 2 fitted to the housing 1 includes a third gasket on the flange lateral surface (upper surface) 2b and vertical surface (side surface) 2c, respectively. The holding groove 11 is provided over the entire length in the width direction or the height direction.

  These first to third gasket holding grooves 9, 10, 11 are formed so as to communicate with each other in the component assembly state shown in FIG. In contrast, a liquid gasket (not shown) is poured and solidified to form a sealing element.

  The end face 1 b of the housing 1 is provided with a liquid gasket inlet 12, and this inlet 12 communicates with the first gasket holding groove 9 through a passage 13. Further, a discharge port 14 for releasing air is provided at the end of the third gasket holding groove 11 provided on the vertical surface 2c of the bearing cap 2. The discharge port 14 has a groove for the liquid gasket. The orifice 15 is set to improve the filling property.

  In the sealing device having the above configuration, as described above, a series of gasket holding grooves 9 on the mating surface of the housing 1 and the oil seal 4, the mating surface of the bearing cap 2 and the oil seal 4, and the mating surface of the housing 1 and the bearing cap 2. 10 and 11 are formed, and liquid gaskets are poured and solidified in the gasket holding grooves 9, 10, 11 to seal the mating surfaces. A liquid gasket injection operation is performed. Compared to the application operation, the injection operation is a work after assembling the parts, so that it requires less labor and skill and can improve workability.

  Further, even if the oil seal 4 is of a type in which the metal ring 6 is directly attached to the counterpart material, the metal ring 5 and the counterpart are formed by injecting a liquid gasket by forming gasket holding grooves 9 and 10 in the counterpart material. The space between the materials can be sealed. Therefore, it is possible to newly use the type of oil seal 4 in which the metal ring 6 is directly attached to the counterpart material. The metal ring 6 made of a steel plate such as SPCC is required to have resistance against gasket injection pressure, and in order to ensure this resistance, the thickness is preferably 0.8 mm or more.

  Further, the contents of the above embodiment may be changed as follows.

(1) In the above embodiment, the gasket holding groove 9 is provided on the inner peripheral wall 1a of the housing 1 as the mating surface of the housing 1 and the oil seal 4, but as shown in FIG. 4, the outer periphery of the metal ring 5 of the oil seal 4 A gasket holding groove 9 may be provided on the surface. Further, gasket holding grooves 9 may be provided on both the inner peripheral wall 1 a of the housing 1 and the outer peripheral surface of the metal ring 5.

(2) In the above embodiment, the gasket holding groove 10 is provided on the inner peripheral wall 2a of the bearing cap 2 as the mating surface of the bearing cap 2 and the oil seal 4, but the gasket holding groove is provided on the outer peripheral surface of the metal ring 5 of the oil seal 4. 10 may be provided. Further, the gasket holding groove 10 may be provided on both the inner peripheral wall 2 a of the bearing cap 2 and the outer peripheral surface of the metal ring 5.

(3) When both the above items (1) and (2) are adopted, the gasket holding grooves 9 and 10 are formed in an annular shape on the outer peripheral surface of the metal ring 5 of the oil seal 4.

(4) As shown in FIG. 5, when the oil seal 4 is an oil seal with a retainer flange 16, the housing end surface 1 b and the bearing cap end surface 2 d (see FIG. 2) facing the retainer flange 16 are first and second Gasket holding grooves 9 and 10 are provided (only the housing end face is shown in the figure). An inlet 12 is provided at one location on the circumference of the retainer flange 16, and a passage 17 communicating from the first gasket holding groove 9 to the third gasket holding groove 11 is provided in the housing 1.

(5) As shown in FIG. 6, when the oil seal 4 is also an oil seal with a retainer flange 16, the retainer flange 16 facing the housing end surface 1b and the bearing cap end surface 2d (see FIG. 2) And second gasket holding grooves 9 and 10 are provided (only the housing end face is shown). An inlet 12 is provided at one location on the circumference of the retainer flange 16, and a passage 17 communicating from the first gasket holding groove 9 to the third gasket holding groove 11 is provided in the housing 1. In this case, the gasket holding grooves 9 and 10 are formed in an annular shape in the retainer flange 16.

The front view of the sealing device which concerns on the Example of this invention Single item perspective view of bearing cap used in the sealing device AA line expanded sectional view in FIG. Sectional drawing of the principal part of the sealing device which concerns on the other Example of this invention. Sectional drawing of the principal part of the sealing device which concerns on the other Example of this invention. Sectional drawing of the principal part of the sealing device which concerns on the other Example of this invention. (A) is a front view of a conventional sealing device, (B) is a cross-sectional view of the sealing device An enlarged cross-sectional view of an oil seal used in the sealing device Single item perspective view of bearing cap used in the sealing device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 1a, 2a Inner peripheral wall 1b, 2d End surface 2 Bearing cap 2b Horizontal surface 2c Vertical surface 3 Shaft insertion space 4 Oil seal 5 Shaft 6 Metal ring 7 Rubber-like elastic body 8 Seal lip 9 First gasket holding groove 10 Second Gasket holding groove 11 third gasket holding groove 12 inlet 13, 17 passage 14 discharge port 15 orifice 16 retainer flange

Claims (2)

A bearing cap (2) is fixed to the housing (1) to form a hole-shaped shaft insertion space (3), and an oil seal (4) is fixed to the peripheral portion of the shaft insertion space (3) to fix the shaft (5 ) In a sealing device slidably in close contact with the peripheral surface of
Gasket holding grooves (on the mating surface of the housing (1) and the oil seal (4), the mating surface of the bearing cap (2) and the oil seal (4), and the mating surface of the housing (1) and the bearing cap (2). 9) A sealing device characterized in that the mating surfaces are sealed by forming a liquid crystal gasket into the gasket holding grooves (9), (10) and (11) by forming (10) and (11). The sealing device of claim 1.
When the oil seal (4) is an oil seal with a retainer flange (16), the retainer flange (16) is aligned with the housing end surface (1b), and the retainer flange (16) is aligned with the bearing cap end surface (2d). A sealing device characterized in that a gasket holding groove (9) (10) is formed on the surface.

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