JP2006144887A - Seal structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal structure making it hard for a seal member to fall from a groove in a structure in which the groove is formed in the mating surface or sliding surface of two members disposed oppositely to each other and the seal member is fitted into the groove. <P>SOLUTION: To seal between one member 1 and the other member 4, the groove 2 is formed in at least one of these members around its mating surface and the seal member 5 is fitted into the groove 2. The seal member 5 is formed in a corrugated shape laterally bent to the longitudinal direction, and the maximum lateral dimension A of the seal member 5 is set larger than a groove width B. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seal structure suitable for sealing between opposing surfaces of two members arranged opposite to each other, such as between a shaft and a bearing, or a sealed casing.

Conventionally, a seal member has been used to prevent fluid (water, oil, gas, etc.) from leaking or foreign matter from entering, and a groove is formed in one of the two members to be fastened. It is known to insert a packing or ring made of rubber or synthetic resin into the groove. For example, Patent Document 1 discloses a technique related to a seal structure in two tightened fixed states that are arranged to face each other via a gasket.
JP 2000-240794 A

  As a sealing member made of an elastic body typified by the rubber packing or the like, those shown in FIGS. 7 and 8 are known. FIG. 7 is a cross-sectional view in which a seal member is fitted into a groove formed in one of two members to be fastened or fitted, and FIG. 8 is a partial development view of the seal member. Usually, the shape of a sealing member such as an O-ring is a ring shape matching the peripheral shape such as a shaft, and the longitudinal direction is linear.

In general, when sealing at a rotational sliding portion between the shaft 1 and the housing 4 as shown in FIG. 7, a shaft hole 4a for inserting the shaft 1 into the housing 4 is opened, and the shaft hole 4a is formed inside the shaft hole 4a. An annular groove 2 is formed, and a seal 3 is fitted and attached to the groove 2. Further, when the opening of the housing is hermetically sealed with a lid, a groove is formed around the opening or around the lid that matches the opening, and a seal member is attached to the groove.
For example, when sealing between the shaft 1 and the housing 4 and forming the groove 2 in the shaft hole 4a and attaching the seal member 3, the inner diameter of the seal member 3 is functionally smaller than the diameter of the shaft hole 4a. Thus, the outer periphery of the shaft 1 needs to be closely attached. The width of the groove 2 is substantially the same as the width of the seal member 3. However, when the seal member 3 is arranged in the vertical direction, particularly when the circumference of the seal member 3 is long, the upper side hangs down due to the weight of the seal member, and the seal member 3 may fall off when the member (shaft 1) is assembled. Yes, the assembling was worse. If the parts are assembled without noticing the drop-off of the seal member 3, the seal member 3 is sandwiched between the shaft 1 and the housing 4, and as a result, the seal member 3 is cut and fluid leakage occurs. It sometimes occurred. There is a method of applying an adhesive to the seal member and inserting it into the groove in order to prevent falling off, but extra steps are required for applying the adhesive and drying the adhesive. Furthermore, the adhesive sometimes protrudes from the sealing surface (upper and lower surfaces in FIG. 7) of the sealing member, and the adhesive that has dried and hardened becomes a foreign substance, and fluid leakage may occur from that portion.

  In order to solve the above problems, in the present invention, in a configuration in which a groove is formed on the mating surface or sliding surface of two members arranged opposite to each other, and a seal member is fitted in the groove, it is difficult to drop from the groove. A seal structure is proposed.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

That is, in claim 1, in order to seal between one member and the other member, a groove is formed around the mating surface of at least one member, and the seal member is fitted in the groove. ,
The seal member is formed in a wave shape that bends to the left and right with respect to the groove longitudinal direction, and the maximum dimension in the width direction of the seal member is larger than the groove width.

  According to a second aspect of the present invention, in the configuration in which the seal member is fitted in the groove, the seal member is formed with a convex portion on the left and right sides with respect to the groove longitudinal direction, and the maximum dimension in the width direction of the seal member is the groove width. It is configured larger.

  According to a third aspect of the present invention, in the configuration in which the seal member is fitted in the groove, the seal member is formed with convex portions on both the left and right sides with respect to the groove longitudinal direction, and the maximum dimension in the width direction of the seal member is greater than the groove width. It is composed largely.

  According to a fourth aspect of the present invention, in the configuration in which the seal member is fitted in the groove, the convex portion is configured in a rectangular shape in plan view.

  According to a fifth aspect of the present invention, in the configuration in which the seal member is fitted into the groove, the convex portion is configured in an arc shape in plan view.

  According to a sixth aspect of the present invention, in the configuration in which a seal member is fitted into the groove, a plurality of the convex portions are provided and arranged alternately on the left and right.

  According to a seventh aspect of the present invention, in the configuration in which the seal member is fitted in the groove, a series of protrusions are formed around both side surfaces of the seal member, the cross-sectional shape of the protrusion is a mountain shape, and the tip of the mountain is the groove. The seal member is provided eccentrically on the outer side, and the maximum dimension in the width direction of the seal member is greater than the groove width.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect, when the seal member is inserted into the groove, tension is generated in the protruding portion of the seal member, so that the drop-off preventing effect can be enhanced. Further, since the seal member is unlikely to fall out of the groove, it is possible to prevent the seal member from being damaged when combined with one member. In addition, since it is difficult to drop off from the groove, an adhesive or the like is unnecessary, and the number of assembly steps can be reduced.

  According to the second aspect of the present invention, when the seal member is inserted into the groove, the convex portion strongly abuts on the side surface of the groove, or is compressed and brought into close contact with each other, thereby preventing the drop. Moreover, since it becomes difficult to drop | omit from a groove | channel, when it combines with respect to one member, it can prevent giving a damage to a sealing member, and can improve assembly property.

  According to a third aspect of the present invention, when the seal member is inserted into the groove, the convex portion strongly abuts on both side surfaces of the groove, or is compressed and brought into close contact with each other, thereby preventing the drop. Moreover, since it becomes difficult to drop | omit from a groove | channel, when it combines with respect to one member, it can prevent giving a damage to a sealing member, and can improve assembly property.

  According to the fourth aspect of the present invention, the pressure contact area between the convex portion of the seal member and the side surface of the groove increases, and it becomes difficult to drop off.

  According to the fifth aspect, when the seal member is inserted into the groove, it can be easily inserted with little catch.

  According to the sixth aspect of the present invention, since the pressing force is generated at the convex portion of the seal member when inserted into the groove, the drop-off preventing effect can be enhanced.

  According to the seventh aspect of the present invention, when the seal member is inserted into the groove, the protrusion strongly contacts the both side surfaces of the groove or is compressed and closely adhered to prevent the drop. Further, the protrusion is compressed in the insertion direction into the groove and can be easily inserted, and the protrusion tip is caught on the side surface of the groove in the removal direction, and is difficult to drop off. Moreover, since it becomes difficult to drop | omit from a groove | channel, when it combines with respect to one member, it can prevent giving a damage to a sealing member, and can improve assembly property.

  Embodiments of the present invention will be described. In this embodiment, as shown in FIG. 7, one member is a shaft 1, the other member is a housing 4, a shaft hole 4a is opened in the housing 4, and an annular groove is formed in the shaft hole 4a. Although the example which forms 2 and fits the sealing member comprised with the elastic body in this groove | channel 2 is demonstrated, it can apply also to another sealing structure and is not limited. For example, it is a case where the opening part of a housing and the opening part of another housing are closely joined and the opening part provided in the housing is sealed with a lid. And in order to seal between both, what is necessary is just the structure which forms the groove | channel 2 around the mating surface of at least any one member, and fits a seal member in this groove | channel 2.

FIG. 1 is a partially developed view of a corrugated seal member, FIG. 2 is a partially developed view of a seal member having a rectangular convex portion, and FIG. 3 is a seal member having an arc-shaped convex portion on both the left and right sides. 4 is a partial development view of a seal member in which arc-shaped convex portions are alternately formed on the left and right sides, FIG. 5 is a cross-sectional view of the seal member in which protrusions are formed on both side surfaces of the seal member, and FIG. It is sectional drawing of the state which inserted the sealing member of 5th Example in the groove | channel.
In addition, the dimension A in a figure means the largest dimension of the width direction of a sealing member larger than the groove width B (FIG. 7) (A> B). Moreover, all the sealing members provided with the structure of the present invention described in the following description are configured such that the maximum dimension in the width direction of the sealing member is larger than the groove width. Further, “left and right” is the left and right direction with respect to the longitudinal direction of the groove. The seal member is made of an elastic body such as rubber or synthetic resin.

A first embodiment of the present invention will be described with reference to FIG.
The seal member 5 has a wave shape that bends in the left-right direction with respect to the longitudinal direction at a predetermined interval. However, the left and right bent shapes may be curved or may be configured to be bent in a straight line and zigzag, and the cross-sectional shape of the seal member 5 is the same in any part. Moreover, the structure which arrange | positions a wavelike part for every predetermined interval may be sufficient as the whole periphery.
The lateral deflection width (maximum lateral dimension) A of the seal member 5 is set to be slightly larger than the groove width B so as to be pushed into the groove 2.
With this configuration, when the seal member 5 is inserted into the groove 2, a compressive force is generated in the left and right corrugated portions 5a of the seal member 5, and a tensile force is generated in the recessed portion 5b. The friction resistance increases with respect to the inner surface of the groove 2, and it is difficult to drop off when the seal member 5 is fitted in the groove 2.
As described above, the seal member 5 is difficult to drop off from the groove 2 and can maintain the state of being fitted in the groove 2. Therefore, when the shaft 1 is inserted into the shaft hole 4 a, the seal member 5 is It is possible to prevent the seal member 5 from being damaged by being caught between the hole 4a and the shaft 1 or being caught. As a result, no adhesive or the like is required, and the number of assembly steps can be reduced.

Next, a second embodiment of the seal member will be described with reference to FIG.
The seal member 6 has convex portions 6a and 6a on the left and right sides with respect to the longitudinal direction. The convex portion 6a is formed in a rectangular shape in plan view, and a plurality of portions where the rectangular convex portions 6a are arranged on both sides are arranged at predetermined intervals in the longitudinal direction. The maximum dimension A in the left-right direction of the portion where the convex portions 6a are arranged on both sides is set to be slightly larger than the groove width B so as to be pushed into the groove 2.

  With such a configuration, when the seal member 6 is inserted into the groove 2, the convex portions 6a and 6a are in strong contact with both side surfaces of the groove 2, or are compressed and brought into close contact with each other, and can be prevented from falling off. In this way, the seal member 6 is unlikely to fall out of the groove 2, so that the assemblability can be improved without being sandwiched between the shaft 1 and the housing 4 as described above.

Next, a third embodiment of the seal member will be described with reference to FIG.
The seal member 7 has convex portions 7a and 7a on the left and right sides with respect to the longitudinal direction. The convex portion 7a is formed in an arc shape in plan view, and a plurality of portions where the arc-shaped convex portions 7a are arranged on both sides are arranged at predetermined intervals in the longitudinal direction. The maximum dimension A in the left-right direction of the portion where the convex portions 7a are arranged on both sides is set to be slightly larger than the groove width B so as to be pushed into the groove 2.
With this configuration, when the seal member 7 is inserted into the groove 2, the convex portions 7 a and 7 a are in strong contact with both side surfaces of the groove 2, or are compressed and brought into close contact with each other, and can be prevented from falling off. In this way, the seal member 7 is unlikely to fall out of the groove 2, so that the assembling property can be improved without being sandwiched between the shaft 1 and the housing 4 as described above. Further, by forming the convex portion 6 in an arc shape, when the seal member 3 is inserted into the groove 2, it can be easily inserted with little catch.
The convex portions 6a and 7a may be arranged on the left and right sides with a predetermined interval. In this case, the pressure contact force is smaller than when the convex portions 6a and 7a are arranged on both sides, but the structure is simple.

Next, a fourth embodiment of the seal member will be described with reference to FIG.
The seal member 8 is a modification of the seal member 7 of the third embodiment, and the seal member 8 has convex portions 8a and 8a alternately formed on the left and right sides with respect to the longitudinal direction. The maximum dimension A of the portions where the convex portions 8a and 8a are alternately arranged is slightly larger than the groove width B and is long enough to be pushed into the groove 2. The convex portion 8a is formed in an arc shape in a plan view, but may be rectangular as shown in FIG. The convex portions 8a and 8a can be alternately arranged over the entire circumference or at a predetermined interval, and the interval between the convex portions 8a and the convex portions 8a is not limited. The shape of the convex portion is not limited to a rectangle or an arc, and may be a trapezoidal shape, a triangular shape, or the like.
By arranging the convex portions alternately on the left and right in this manner, a wavy deformation occurs when the seal member 8 is inserted into the groove 2, thereby obtaining a pressure contact force on the side wall of the groove 2. As a result, it is possible to prevent damage to the seal member 3 due to dropping and pinching as described above.

Next, a fifth embodiment of the seal member will be described with reference to FIGS.
The seal member 9 is formed with a series of protrusions 9 a and 9 a around both side surfaces, the protrusion 9 a has a mountain-like cross-sectional shape, and the tip of the mountain is eccentrically provided outside the groove 2. 5 and 6 are plan sectional views, in which the groove 2 side is defined as the upper side and the shaft 1 side is defined as the lower side.
That is, the seal member 9 is provided with a triangular protrusion 9a on the side surface, the protrusion 9a is provided on the entire periphery of the side surface, and is provided on both sides symmetrically in a sectional view. When the inclination angle of the upper slope 9b of the protrusion 9a with respect to the horizontal is α and the inclination angle of the lower slope 9c of the protrusion 9a with respect to the horizontal is β, the inclination angle α of the upper slope 9b is equal to that of the lower slope 9c. It is configured to be larger than the inclination angle β (α> β). The maximum dimension A in the width direction of the portions where the projections 9a and 9a are arranged on both sides is set to be slightly larger than the groove width B so as to be pushed into the groove 2.
With this configuration, when the seal member 9 is inserted into the groove 2, the protrusions 9a and 9a are compressed in the insertion direction so that the tip of the protrusion 9a can be smoothly inserted without being caught. And even if a force is applied in a direction in which the seal member 9 has a long peripheral length and is inserted into the groove 2 by its own weight, the tip of the protrusion 9a is caught on the side surface of the groove 2 and is difficult to drop off. Further, since the maximum dimension A in the width direction of the seal member 9 is larger than the groove width B, the protrusions 9a and 9a are in strong contact with both side surfaces of the groove 2 or are compressed and closely adhered to prevent the drop.
Moreover, since it becomes difficult to drop out from the groove 2, when the seal member 9 is inserted into the groove 2 and combined, it is possible to prevent the seal member 9 from being damaged and to improve the assemblability.
Further, in FIG. 5, one protrusion 9a is provided on each side surface of the seal member 9, but a plurality of protrusions 9a may be arranged on each side surface in the vertical direction.

The partially expanded view of the sealing member made into the waveform shape. The partial expanded view of the sealing member which formed the convex part of the rectangular shape. The partial expanded view of the sealing member which formed the circular-arc-shaped convex part in both right and left. The partial expanded view of the sealing member which formed the circular-arc-shaped convex part alternately right and left. Sectional drawing of the sealing member which formed the processus | protrusion on the both sides | surfaces of a sealing member. Sectional drawing of the state which inserted the sealing member of 5th Example in the groove | channel. Sectional drawing which fitted the sealing member in the groove | channel formed in one of the two members conventionally fastened or fitted. The partial expanded view of the conventional sealing member.

Explanation of symbols

2 Groove 3, 5, 6, 7, 8, 9 Sealing member 6a, 7a, 8a Projection 9a Projection

Claims (7)

In order to seal between one member and the other member, a groove is formed around the mating surface of at least one of the members, and the seal member is fitted in the groove.
A seal structure, wherein the seal member is formed in a wave shape that bends left and right with respect to the longitudinal direction of the groove, and the maximum dimension of the seal member in the width direction is larger than the groove width.   In the configuration in which the seal member is fitted into the groove, the seal member is formed with convex portions on one side on the left and right sides with respect to the groove longitudinal direction, and the maximum dimension in the width direction of the seal member is larger than the groove width. The seal structure according to claim 1.   In the configuration in which the seal member is fitted into the groove, the seal member is formed with convex portions on both the left and right sides with respect to the longitudinal direction of the groove, and the maximum dimension in the width direction of the seal member is larger than the groove width. The seal structure according to claim 1.   4. The seal structure according to claim 2, wherein in the configuration in which the seal member is fitted into the groove, the convex portion is configured in a rectangular shape in plan view.   4. The seal structure according to claim 2, wherein in the configuration in which the seal member is fitted into the groove, the convex portion is configured in an arc shape in a plan view.   The seal structure according to any one of claims 3 to 5, wherein a plurality of the convex portions are provided and alternately arranged on the left and right sides in a configuration in which a seal member is fitted into the groove.   In the configuration in which the seal member is fitted into the groove, a series of protrusions are formed around both sides of the seal, the cross-sectional shape of the protrusion is a mountain shape, and the tip of the mountain is provided eccentrically on the outside of the groove, A seal structure characterized in that the maximum dimension of the seal member in the width direction is larger than the groove width.

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