JP4462481B2 - O-ring mounting structure - Google Patents

Description

  The present invention prevents an O-ring from being easily detached from an annular groove or falling off at an O-ring mounting position in parts such as a casing and a cover of an engine, a pump, etc. having sealing properties. The present invention relates to an O-ring mounting structure that can be easily mounted and fixed and can prevent deterioration in sealing performance at an O-ring fixing point.

Conventionally, in parts such as engines and pumps such as casings and covers, O-rings are often used in parts that require hermeticity. In order to mount this O-ring between the joining surfaces of the constituent members such as the casing and the cover, an annular groove is formed in the joining surface, and the O-ring is disposed in the annular groove. In order to prevent the O-ring from easily coming off or falling off from the annular groove, protrusions are formed on the O-ring, and the O-ring is formed into an annular groove at equal intervals in the circumferential direction. The O-ring is prevented from falling off when fitted. Such a technique is disclosed in Patent Document 1 below.
Patent No. 2905124

  Further, when such a part is manufactured in a factory, it is often carried to another factory and attached to, for example, a large structure of an engine. When a component such as a pump is shipped and transported from a parts factory and mounted on a structure or the like at another assembly factory, the O-ring may drop off from the component or the O-ring may be lost. There is a disadvantage that the O-ring is detached during the assembly work and the work efficiency is lowered.

  As means for solving such inconvenience, protrusions were formed on several inner walls of the annular groove, and the O-rings were pressed against the inner walls facing each other and fixed to prevent the O-rings from falling off. However, simply forming the protrusions on the inner wall of the annular groove has caused various disadvantages. For example, if the protrusion is small, sufficient fixing force cannot be obtained to fix the O-ring in the annular groove, and the O-ring will easily fall out of the annular groove. If the protrusion is too large, However, although the pressing force for fixing the O-ring increases and the fixing force of the O-ring can be sufficient, on the other hand, the O-ring cross-section is deformed at the projection forming place, and the O-ring is twisted and lifted. If it is attached to another structure in such a state, it protrudes from the annular groove of the O-ring, and the protruding part bites into and is crushed into the joint surface part of other parts, resulting in a decrease in the sealing ability of the O-ring. Will do.

  In addition, as a means for fixing the O-ring to the annular groove, an S-shaped bent portion is formed at an appropriate position on the circumference of the annular groove, and the O-ring is forcibly bent at the bent portion and comes into contact with the side wall of the annular groove. A means for fixing the O-ring to the annular groove with the contact pressure has also been developed. However, according to such means, it is necessary to form an S-shaped bent portion at an appropriate position of the annular groove, but there is a space for forming such a bent portion in a component that is required to be downsized. It is not easy to provide, and if the bent part is forcibly formed, the constituent members will eventually become larger, and even if the bent part is formed at an appropriate place in the circumferential path of the annular groove, the places where it can be formed are limited. Therefore, a large number of fixing bent portions cannot be formed, and the O-ring may not be fixed sufficiently.

  Accordingly, as a result of earnest and research, the inventor has devised an O-ring in which a plurality of protrusions are formed at predetermined intervals, and an annular mounting groove in which the O-ring is inserted and arranged. The ring main body portion in the vicinity of the O-ring projecting portion forming portion is formed with a bent region portion so as to swell toward the opposite side to the projecting portion forming side. The groove wall is formed with a recess in which the protrusion is disposed, and the protrusion is disposed and fixed so as to generate a pressing force in the recess, and the periphery of the mounting groove in the vicinity of the recess formation portion of the casing. The road is formed with a bent circumferential path portion so as to swell toward the opposite side to the formation side of the recessed portion, and the bent area portion has an O-ring mounting structure accommodated in the bent circumferential path portion. It solves the above problems.

  In the above configuration, the protrusion is formed to protrude inward of the O-ring, and the recess is formed in an inner circumferential groove wall portion of the mounting groove, or in the above configuration, the protrusion of the O-ring. The above problems have been solved by providing an O-ring mounting structure in which the O-ring protrudes outward from the O-ring and the recess is formed on the outer circumferential groove wall of the mounting groove. Further, in the above-described configuration, the above-mentioned problem is solved by adopting an O-ring mounting structure in which the protrusion is formed with a recess from the protrusion surface side toward the protrusion rear surface side. .

According to the invention of claim 1, the O-ring can be mounted in the mounting groove very easily in a fixed state, and the O-ring is removed from the casing at the time of shipment, transportation and assembly work from the factory to another assembly factory. It is possible to prevent a situation where it easily falls off. Further, the mounting force of the O-ring in the mounting groove can be further strengthened. According to the invention of claim 2, the casing can be sufficiently installed in the conventional installation space without increasing the size of the casing. According to the invention of claim 3, it is possible to effectively use the pump chamber having a larger area. According to invention of Claim 4, there exists an effect that it can make it easy to perform the mounting | wearing operation | work to the attachment groove | channel of an O-ring. In addition, if the protrusion part to the pump chamber side in the recessed part formed toward the pump chamber side is formed in flat shape or flat shape, the obstacle which protrudes in the pump chamber does not exist, and the flow of fluid is obstructed. And good flow can be maintained. In addition, if the projecting portion to the pump chamber side in the bent circumferential portion of the mounting groove that bends toward the pump chamber side is formed flat or flat, there is no obstacle projecting into the pump chamber, A good flow can be maintained without obstructing the flow of the fluid.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 2, the O-ring A in the present invention is basically an endless ring (loop), but is substantially in the shape of the circumferential direction (groove course) of the mounting groove 4 of the casing B described later. It is formed so as to be equal, and it is rare that it is a regular shape such as a circular shape or a rectangular shape. As shown in FIGS. It often becomes a complicated shape according to As shown in FIG. 2 (A), the O-ring A is composed of a ring body 1 and a plurality of protrusions 2, 2,... A plurality of protrusions 2, 2,. The intervals between the protrusions 2, 2,... Are not necessarily formed at regular intervals, but are made to correspond to the formation positions of the recesses 5, 5,. Is.

  As shown in FIGS. 1 (B) and 5 (A), the protrusion 2 is formed so as to protrude in a direction substantially orthogonal to the ring circumferential direction of the ring body 1, and is substantially rectangular when viewed from the plane. It is formed in a rectangular parallelepiped shape. The thickness of the protrusion 2 is slightly smaller than the diameter of the ring body 1, the protrusion surface 2 a side is stepped from the ring body 1, and the protrusion back surface 2 b side is the ring. The main body 1 and the main body 1 are formed so as to have a flat surface where no step is formed.

  In addition, as shown in FIG. 2C, both side surfaces 2c and 2c in the width direction of the projections 2, 2,... Are formed so that the distance gradually decreases toward the projection back surface 2b. Yes. Further, the protrusion tip surface 2d, which is the tip of the protrusion 2, is inclined inward toward the protrusion back surface 2b as shown in FIG. 2 (D). That is, the protrusion part surface 2a is formed larger in the width dimension and the protrusion direction dimension than the protrusion part back surface 2b. Here, the width direction of the protrusion 2 is the same as the circumferential direction of the ring body 1, and the protruding direction is a direction orthogonal to the circumferential direction of the ring body 1. The shape of the protruding portion 2 is not limited to the above shape, and may be formed in a substantially trapezoidal shape or a substantially U-shape as the planar shape.

Further, in the O-ring A, a bent region portion 1a is formed in the ring main body portion 1 in the vicinity of the formation portion of the projection portion 2 as shown in FIGS. The bent region portion 1a is a portion that is formed so as to bulge toward a side opposite to the side on which the protrusion 2 is formed in a part of the ring main body portion 1. The bent region portion 1a is bent in a trapezoidal shape along the circumferential direction, and is composed of inclined portions 1a ₁ and 1a ₁ and straight portions 1a ₂ on both sides of the bent region. It is formed at _two straight portions 1a.

In addition, the angle formed by the inclined portions 1a ₁ and 1a ₁ is appropriately set according to the size of the bent region, but has a shape corresponding to a bent path portion 4c of the casing B described later. As shown in FIGS. 2 (A) and 2 (B), the protrusion 2 is surrounded by a substantially trapezoidal shape by both the inclined portions 1a ₁ and 1a ₁ and the straight portion 1a ₂ , that is, a ring body. It is formed so as to be located on the inner side of the bulge in the bent region portion 1a of the portion 1. Further, the bent region portion 1a is not limited to the trapezoidal shape as described above, but may be a substantially rectangular shape or an arc shape. In particular, the bent region 1a may not be formed at the portion where the protrusion 2 is formed.

  Further, the protrusions 2, 2,... May be formed on the inner peripheral side of the ring main body 1 or may be formed on the outer side of the ring main body 1. When the protrusions 2, 2,... Are formed on the inner side of the ring body 1, the bent region 1a is formed so as to bulge outward of the ring body 1. When the protrusions 2, 2,... Are formed on the outer side of the ring body 1, the bent region 1a is formed so as to be recessed on the inner side of the ring body 1 [FIG. (See (A), (B)).

  Further, as shown in FIGS. 2B to 2D, a recess 2 e is formed in the protrusion 2. The depression 2e is a depression formed from a substantially central portion of the projection surface 2a of the projection 2 toward the projection back surface 2b, and the projection 2 is elastic in the width direction via the depression 2e. Can be expanded and contracted. More specifically, the recess 2e is formed at a substantially central location on the projection surface 2a. The elastic expansion and contraction in the width direction of the protrusion 2 is necessary when the protrusion 2 is inserted into a recess 5 formed in the mounting groove 4 of the casing B described later. The material of the O-ring A is rubber or synthetic resin and is inherently elastic. However, the O-ring A can be more flexibly deformed by the recess 2e. The shape of the recess 2e is formed in a rectangular shape such as an ellipse, an ellipse, a rectangle, or a square in plan view. The indented portion 2e is in a non-penetrating state, but may be formed in a penetrating state from the protruding portion surface 2a of the protruding portion 2 toward the protruding portion back surface 2b.

  Next, the casing B will be described. The casing B is, for example, a case of a water pump for cooling the engine or a constituent member constituting a part of the engine. In addition, a volute chamber or the like constituting the water pump may be formed in the engine body, and the casing B is used as a cover member of the water pump and always needs to be sealed. Ring A is provided. In the following description, this water pump will be described as a specific example. The casing B is internally provided with a drive shaft bearing to which the impeller is attached, and a belt wheel is provided outside the casing B on the drive shaft.

  As shown in FIG. 3A, a ring-shaped attachment groove 4 is formed on the outer periphery of the casing B, and the O-ring A is attached to the attachment groove 4. The mounting groove 4 is formed as a circumferential path (annular groove course or path), but it is rare to have a regular shape such as a circular shape or a rectangular shape. Since it has a shape corresponding to the outer periphery, specifically, the outer peripheral shape of the pump chamber 6 inside the pump, it often has a complicated ring (loop) shape.

Further, as shown in FIG. 3C, the mounting groove 4 has groove wall portions 4b and 4b formed on both sides of a groove bottom portion 4a having a substantially flat cross section, and the groove wall portions 4b and 4b. May have a uniform width up to a certain depth, or may be formed as slanted groove wall portions 4b, 4b whose width decreases as the depth increases. Both the groove wall portions 4b, 4b are formed in a rising wall shape with respect to the groove bottom portion 4a, and one groove wall portion 4b partitions the inner side of the casing B, that is, the pump chamber 6 side. A rising wall plate shape is formed, which is referred to as an inner circumferential groove wall portion 4b ₁ . Further, the other groove wall portion 4b has a rising wall or a rising plate shape that partitions the outside of the casing B, and this is referred to as an outer peripheral side groove wall portion 4b ₂ .

As described above, the shape of the O-ring A in the circumferential direction is substantially the same as the shape of the entire circumferential path of the mounting groove 4. The groove width dimension of the mounting groove 4 is formed larger than the diameter of the ring main body 1 of the O-ring A. Further, the depth dimension of the mounting groove 4 is smaller than the diameter of the ring main body 1 of the O-ring A, and the O-ring A protrudes from the mounting groove 4 in the depth direction. In the circumferential direction (groove course) direction of the mounting groove 4, recessed portions 5, 5,... Are formed at appropriate intervals. The recess 5 is formed in either the inner circumferential groove wall 4b ₁ or the outer circumferential groove wall 4b ₂ of the mounting groove 4.

In the recesses 5, 5,..., The protrusions 2, 2,... Of the O-ring A are accommodated, and the protrusions 2, 2,. Are fixed to each other. As shown in FIG. 3 (B), the recessed portion 5 is formed such that an appropriate region portion of the groove wall portion 4b (inner peripheral side groove wall portion 4b ₁ or outer peripheral side groove wall portion 4b ₂ ) is recessed, More specifically, it is a portion surrounded by a wall surface so as to have a rectangular shape such as a substantially rectangular shape or a square shape when seen in a plan view. The recessed portion 5 includes a recessed bottom portion 5a, recessed sidewall portions 5b and 5b, and a recessed distal end wall portion 5c, and a substantially rectangular parallelepiped chamber is formed by the wall portions. As described above, all the projecting portions 2, 2,... Of the O-ring A are fixed so as to be fitted (or fitted) into all the recessed portions 5, 5,. .

All of the recesses 5, 5,... Are formed in the inner circumferential groove wall 4b ₁ or the outer circumferential groove wall 4b ₂ of the mounting groove 4 as described above. Further, in the mounting groove 4, a bent circumferential portion 4 c is formed at a location where the recessed portion 5 is formed. The bent circumferential path portion 4c is a portion formed so as to bulge toward a side opposite to the side where the recessed portion 5 is formed in a part of the mounting groove 4. The bent peripheral channel portion 4c is circumferential path are bent along the (groove course) direction trapezoidal, constructed from the ramp portion 4c ₁ on both sides of the bending region, 4c ₁ and straight line portion 4c ₂ Metropolitan The recessed portion 5 is formed at _two locations on the straight path portion 4c.

In addition, the angle formed by the two slope portions 4c ₁ and 4c ₁ is appropriately set according to the size of the bent region. The concave portion 5 is formed so as to be surrounded by a substantially trapezoidal shape by the both inclined road portions 4c ₁ and 4c ₁ and the straight road portion 4c ₂ , that is, inwardly bulges in the bent circumferential path portion 4c of the mounting groove 4. It is formed to be located on the side. Further, the bent circumferential path portion 4c is not limited to the trapezoidal shape as described above, but may be formed into a substantially rectangular shape or an arc shape. In particular, the bent circuit portion 4c may not be formed at the recessed portion 5 formation position (see FIGS. 7 and 8).

In addition, the recesses 5, 5,... May be formed on the inner circumferential groove wall 4b ₁ of the mounting groove 4 or may be formed on the outer side of the outer circumferential groove wall 4b ₂ . When the recessed portion 5 is formed in the inner circumferential groove wall portion 4b ₁ , the bent circumferential passage portion 4c is formed so as to bulge outward from the casing B. Further, if the recess portion 5 is formed on the outer peripheral groove wall portion 4b _2, the bent peripheral channel portion 4c is formed so as to be recessed inward of the casing B [see Figure 4 (A)]. When such a bent circuit portion 4c is formed, the O-ring A having the bent region portion 1a formed corresponding to the bent circuit portion 4c is used. Further, the bent circumferential path portion 4c may be formed only in the mounting groove 4 of the casing B, and the bent region portion 1a may not be formed on the O-ring A side (see FIGS. 7 and 8). Further, when the bent circumferential path portion 4c is formed so as to be recessed toward the inner side of the casing B, that is, the pump chamber 6 side, the bent circumferential path portion 4c and the pump chamber 6 are surrounded by a partition portion. Is formed in a flat or substantially flat shape. This is formed so that the wall-shaped partition portion formed from the inner peripheral groove wall portion 4b _{1 at} the bent peripheral passage portion 4c does not protrude locally to the pump chamber 6 side, As shown in FIG. 4A, the partition portion is substantially flat with respect to the pump chamber 6 side, and is formed so that the thickness around the partition portion is thick. Furthermore, the wall thickness of the partition part between adjacent bending | circularity path parts 4c and 4c is formed uniformly, and it is also possible to make it the shape which the protrusion or bulging to the pump chamber 6 inner side by the bending | circulation periphery part 4c does not exist almost. is there. Further, even when the bent path portion 4c protrudes toward the pump chamber 6, it is formed in a flat shape so that the amount of protrusion is very slightly expanded. Thereby, the flow of the fluid in the pump chamber 6 can be maintained satisfactorily. Further, as shown in FIG. 4B, the shape of the bent circumferential path portion 4c may be formed in a gentle curved shape or an arc shape having a large curvature radius. In addition, when the mounting groove 4 is not formed with the bent circumferential path portion 4c and the mounting groove 4 is formed with only the recessed portions 5, 5,... Projecting toward the pump chamber 6 side. The periphery on the pump chamber 6 side in the partition portion between the recess 5 and the pump chamber 6 side is formed flat or substantially flat (see FIG. 10). Further, there is a type in which the O-ring A in which the protruding portions 2, 2,... Are formed on the inner peripheral side and the outer peripheral side is mounted in the mounting groove 4 having a shape corresponding to this (see FIG. 11).

  In order to fix the protrusions 2, 2,... Of the O-ring A to the recesses 5, 5,... Of the casing B, the distance between the protrusion side surfaces 2c, 2c of each protrusion 2 (the protrusion 2 (Width direction dimension) Wa is the same as the distance dimension (width direction dimension of the recessed part 5) Wb between both recessed side wall parts 5b, 5b of the recessed part 5, or the distance between both projecting part side surfaces 2c, 2c of the projecting part 2 It is necessary that the dimension (the dimension in the width direction of the protrusion 2) Wa is formed larger than the distance dimension (the dimension in the width direction of the recess 5) Wb between the both side walls 5b, 5b of the recess 5. That is, Wa ≧ Wb (see FIGS. 6A and 6B).

  First, in order to mount the O-ring A in the mounting groove 4 of the casing B, the positions of the respective parts of the O-ring A are aligned according to the shape of the mounting groove 4, and the O-ring A is arranged in the mounting groove 4. Are formed and fixed in recesses 5, 5,... Formed in the mounting groove 4. The protrusions 2, 2,. At this time, each protruding portion 2 of the O-ring A is in a state of being fitted into the recessed portion 5, that is, in a fitted state, and is sandwiched between both recessed side wall portions 5 b and 5 b of the recessed portion 5, so that the width direction of the protruding portion 2 is elastic. Will shrink.

As a result, an elastic pressing force is generated between the protrusion 2 and the recess 5, and the protrusion 2 is fixed to the recess 5. As a result, the O-ring A is fixed to the mounting groove 4 of the casing B. Mounted in a state. In this way, the parts are manufactured in a factory, transported to another factory, and the O-ring A is dropped from the casing B in the process of shipment, transportation, etc., for example, until it is attached to a large engine structure. It is possible to prevent a reduction in work efficiency due to the loss of the O-ring A or the removal of the O-ring A during assembly work. The protrusions 2, 2,... Of the O-ring A are formed on either the inner side or the outer side, but are not necessarily limited thereto, and the protrusions 2, 2,. .. May be formed on both the inner side and the outer side. In this case, as shown in FIG. 9 (A), (B) , the casing B side of the recessed portions 5, ... inner circumferential groove wall portion 4b ₁ side and the outer peripheral side groove wall is also the fitting groove 4 locations formation of They are formed in a mixed manner on the part 4b ₂ side. Even in this case, it is natural that the formation positions of the protrusions 2, 2,... Correspond to the recesses 5, 5,.

  In the present invention, the protrusions 2, 2,... Of the O-ring A are fitted (inserted) into the recesses 5, 5,. The O-ring A can be mounted and fixed in the mounting groove 4 of the casing B only by being fixed to the recesses 5, 5,. This mounting operation can be performed very easily, and the O-ring A can be mounted on the casing B relatively firmly by fixing with the plurality of protrusions 2, 2,... And the recesses 5, 5,. As a result, it is possible to prevent inconveniences such as the O-ring A being easily dropped from the casing B at the time of shipment, transportation and assembly work from the factory to another assembly factory.

Are formed so as to project inward of the O-ring A, and the recesses 5, 5,... Are formed on the inner circumferential groove wall 4b ₁ of the mounting groove 4. The casing B can be formed without being particularly large. That is, since the recesses 5, 5,... Are formed in the inner circumferential groove wall portion 4b ₁ of the mounting groove 4, the outer groove wall portion 4b ₂ of the mounting groove 4 has a minimum portion protruding outward. Can be. Accordingly, the casing B can be easily mounted on an engine such as an automobile without increasing the size of the casing B.

Next, the O-ring projecting portions 2 of A, ... are formed to project outward of the O-ring A, the recessed portions 5, ... are formed in the outer peripheral groove wall portion 4b ₂ of the fitting groove 4 As a result, the recesses 5, 5,... Are formed in the outer peripheral side groove wall 4b ₂ of the mounting groove 4, so that the inner peripheral side groove wall 4b ₁ of the mounting groove 4 is directed toward the pump chamber 6 side. Therefore, the area of the pump chamber 6 can be increased by that amount and used effectively.

  Further, the ring body portion 1 in the vicinity of the formation portion of the protrusion portion 2 of the O-ring A is formed with a bent region portion 1a so as to bulge toward the opposite side to the formation portion of the protrusion portion 2, and the recess of the casing B is formed. The circumferential path of the mounting groove 4 in the vicinity of the formation portion of the portion 5 is formed with a curved circumferential path portion 4c so as to swell toward the side opposite to the formation side of the recessed portion 5, and the curved area section 1a is a curved circumferential path section. By being accommodated in 4c, the O-ring A is unlikely to come off from the mounting groove 4, and can be fixed more firmly. Further, since the bent region 1a is formed in the vicinity of the portion where the protrusion 2 is formed in the O-ring A, the O-ring A can be stably disposed in the mounting groove 4. Further, the O-ring A can be prevented from being lifted or twisted from the mounting groove 4. In addition, the protrusions 2, 2,... Can be easily attached to the mounting groove 4 of the O-ring A by forming the recess 2e.

  That is, when the O-ring A is mounted, the recess 2e makes it easy for the protrusion 2 to be elastically deformed by deformation, and to easily reduce the width dimension and the like. When the protrusion 2 of the O-ring A is fitted into the recess 5 of the mounting groove 4, the protrusion 2 can be fixed to the recess 5 with a slight force. Therefore, the mounting workability of the O-ring A to the mounting groove 4 can be improved. Further, by setting the protrusion 2 to be the same size or slightly larger than the recess 5, the protrusion 2 can be prevented from coming off from the recess 5 from the annular groove. It can be made difficult to lift and twist.

(A) is a plan view of a state in which an O-ring is mounted on a casing, (B) is an enlarged view of a portion of (A), and (C) is a cross-sectional view taken along line X ₁ -X ₁ of (B). (A) is a plan view of the O-ring, (B) is an enlarged view of the part B of (A), (C) is a cross-sectional view taken along arrow X ₂ -X ₂ of (B), and (D) is X of (B). FIG. ₃ is a cross-sectional view taken along the ₃ -X ₃ arrow. (A) is a plan view of the casing, (B) is an enlarged view of a section C of (A), and (C) is a cross-sectional view taken along arrow X ₄ -X ₄ of (B). (A) is a plan view of a state in which an O-ring having a protrusion on the inner side is mounted on the casing, and (B) is an attachment of a type in which the shape of the bent circuit portion is formed in a large curved circular arc shape. It is the principal part enlarged view which mounted | wore the groove | channel with the O-ring. (A) is a principal part expansion perspective view of the protrusion part location of an O-ring, (B) is a principal part expansion perspective view of the dent part location of a casing. (A) is an enlarged plan view of the protruding portion of the O-ring, and (B) is an enlarged view of a partial cross section in which the protruding portion is fixed in the recessed portion. (A) is a top view of the state which mounted | wore the casing with the O-ring in which a bending area | region part is not formed, (B) is a top view of an O-ring. (A) is a plan view of a state in which an O-ring with a protrusion formed on the inner side and no bent region is formed on the casing, and (B) is a plan view of the O-ring. (A) is a plan view in which an O-ring of a type in which the formation of protrusions is mixed inward or outward is mounted on the casing, and (B) is a type in which the formation of protrusions is mixed inward or outward. It is a top view of an O-ring. It is a top view which mounted | wore the casing with the O-ring of the type in which a bending periphery part is not formed in this invention. It is a top view which mounted | wore the casing of the type in which the recessed part location does not protrude in a pump chamber about the type of O-ring which mixed formation of the protrusion part inward or outward.

Explanation of symbols

A ... O-ring, B ... Casing, 1 ... Ring main body, 1a ... Bending area part, 2 ... Projection part 2a ... Projection part surface, 2b ... Projection part back surface, 2e ... Depression part, 4 ... Mounting groove, 4b ... Groove wall 4b ₁ ... inner circumferential groove wall portion, 4b ₂ ... outer circumferential groove wall portion, 5 ... recess.

Claims (4)

The ring body portion is composed of an O-ring in which a plurality of protrusions are formed at a predetermined interval and a casing in which an annular mounting groove into which the O-ring is inserted is formed . A bent region portion is formed so as to swell toward a side opposite to the projecting portion forming side, a recess portion in which the projecting portion is disposed is formed in a groove wall portion of the mounting groove, and the projecting portion is the recess. It is arranged and fixed so as to generate a pressing force in the part, and the circumference of the mounting groove in the vicinity of the recessed part forming part of the casing is formed as a bent circumferential part so as to swell toward the side opposite to the side where the recessed part is formed. And an O-ring mounting structure in which the bent region portion is accommodated in a bent circumferential portion .   2. The mounting structure for an O-ring according to claim 1, wherein the protrusion is formed so as to protrude inward of the O-ring, and the recess is formed in an inner circumferential groove wall of the mounting groove.   2. The mounting structure for an O-ring according to claim 1, wherein the protruding portion of the O-ring is formed to project outward from the O-ring, and the recessed portion is formed on an outer peripheral groove wall portion of the mounting groove. .   The mounting of an O-ring according to any one of claims 1, 2, or 3, wherein the protrusion is formed with a recess from the surface of the protrusion toward the back of the protrusion. Construction.

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