JP2019094999A - Spring member and sealing member - Google Patents

Abstract

To properly press a lip member.SOLUTION: A spring member 12 has: an annular bottom part 40 extending along a peripheral direction C with a center axis AX as a center; outside pressing parts 42 which are arranged at the bottom part 40 in a plurality of pieces along the peripheral direction C, and extend toward the outside of a radial direction orthogonal to the center axis AX from base end parts connected to the bottom part 40 up to tip parts; inside pressing parts 44 which are arranged at the bottom part 40 in a plurality of pieces along the peripheral direction C, and extend toward the inside of the radial direction orthogonal to the center axis AX from base end parts connected to the bottom part 40 up to tip parts; an outside guide part 46 which extends toward the outside of the radial direction from a base end part connected to the bottom part 40 up to a tip part, and whose length from the base end part up to the tip part is shorter than lengths of the outside pressing parts 42 from the base end parts up to the tip parts; and an inside guide part 48 which extends toward the inside of the radial direction from a base end part connected to the bottom part 40 up to a tip part, and whose length from the base end part up to the tip part is longer than lengths of the inside pressing parts 44 from the base end parts up to the tip parts.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a spring member and a sealing member.

  In order to seal between two members which move relative to each other, a sealing member formed of PTFE (polytetrafluoroethylene) may be used. PTFE, for example, can be used under high temperature and high pressure as compared with materials such as rubber, is excellent in oil resistance and pressure resistance, and is excellent in slidability. On the other hand, since a PTFE sealing member may be deformed at high temperatures, it may be difficult to maintain sufficient sealability over a long period of time. Therefore, for example, as shown in Patent Document 1 and Patent Document 2, U-shaped or V-shaped spring members are inserted into the grooves provided in the PTFE-made sealing member, and the portions on both sides of the sealing member ( A structure is proposed in which the lip member is pressed in the direction in which the spring member spreads. According to this structure, by pressing the lip member with the spring member, it is possible to maintain the state in which the member to be sealed is pressed, and it is possible to suppress the decrease in sealing performance.

Japanese Utility Model Publication No. 63-27763 JP, 2015-135137, A

  In the configuration in which the spring member is inserted into the groove as described above, if the position or posture of the spring member in the groove is inappropriate, the spring member may not be able to press the lip portion properly. . In this case, there is a possibility that the reduction in the sealing performance due to the lip portion can not be suppressed.

  This invention is made in view of the above, and an object of this invention is to provide the spring member and sealing member which can press a lip member appropriately.

  The spring member according to the present disclosure is a spring member used for a sealing member that seals between two members that move relative to each other, and has an annular bottom extending along a circumferential direction around a central axis. And an outer pressing portion provided in the bottom portion along the circumferential direction and extending outward in the radial direction orthogonal to the central axis from the proximal end portion connected to the bottom portion to the distal end portion; A plurality of inner pressure portions provided at the bottom along the circumferential direction and extending inward in the radial direction orthogonal to the central axis from the base end connected to the bottom to the tip, and connected to the bottom It extends radially outward from the proximal end to the distal end, and the length from the proximal end to the distal end is the length from the proximal end to the distal end of the outer pressing portion. Outer guide shorter than length and proximal to distal end connected to the bottom And an inner guide portion extending radially inward and having a length from the proximal end to the distal end shorter than a length from the proximal end to the distal end of the inner pressing portion. .

  In the spring member, it is preferable that the outer guide portion and the inner guide portion have a shorter width in the circumferential direction than the outer pressing portion and the inner pressing portion.

  In the spring member, the outer pressing portion and the inner pressing portion have a width of the distal end portion along the circumferential direction longer than a width of the proximal end portion along the circumferential direction, and the outer guide portion It is preferable that the width of the distal end portion along the circumferential direction of the inner guide portion is shorter than the width of the proximal end portion along the circumferential direction.

  In the spring member, the pair of outer pressing portions and the inner pressing portion protrude from the same position in the circumferential direction of the bottom portion, and the pair of outer guide portions and the inner guide portion are in the circumferential direction of the bottom portion It is preferable to project from between the pair of outer pressing portions and the inner pressing portions.

  The tip end portions of the outer guide portion and the inner guide portion are preferably closer to the bottom portion in the axial direction along the central axis than the tip portions of the outer pressing portion and the inner pressing portion.

  A sealing member according to the present disclosure includes the spring member and a lip member made of resin, the lip member is an annular member having a storage groove extending annularly, and the spring member is the sealing member. The outer pressing portion is disposed in the storage groove, and the outer pressing portion presses the outer peripheral surface of the storage groove, and the inner peripheral pressing portion presses the inner peripheral surface of the storage groove.

  It is preferable that in the sealing member, the outer guide portion contacts a surface on the outer peripheral side of the storage groove, and the inner guide portion contacts a surface on the inner peripheral side of the storage groove.

  According to the present invention, the lip member can be pressed properly.

FIG. 1 is a cross-sectional view of a sealing member according to the present embodiment. FIG. 2 is a schematic view of a spring member according to the present embodiment. FIG. 3A is a schematic view of a spring member according to the present embodiment. FIG. 3B is a schematic view of a spring member according to the present embodiment. FIG. 4 is a schematic view showing the spring member attached to the lip member. FIG. 5: is a schematic diagram which shows the example of attachment of the sealing member which concerns on a comparative example. FIG. 6 is a view showing another example of the sealing member.

  Hereinafter, embodiments of a spring member and a sealing member according to the present invention will be described based on the drawings. The present invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by persons skilled in the art or those that are substantially the same.

  FIG. 1 is a cross-sectional view of a sealing member according to the present embodiment. FIG. 1 schematically shows a cross section of a state in which the first member 100 and the second member 110 are sealed by the sealing member 1 according to the present embodiment. The first member 100 and the second member 110 are two members which move relative to each other. In the present embodiment, the first member 100 is a moving member such as a piston, and the second member 110 is a non-moving member such as a cylinder (housing). However, this is an example. The first member 100 may be any member that moves relative to the second member 110. For example, the second member 110 may move while the first member 100 is fixed or held to another object or the like without moving. Also, both the first member 100 and the second member 110 may move.

  In the present embodiment, the first member 100 has a cylindrical outer peripheral surface 100A, and the second member 110 has a cylindrical inner peripheral surface 110A. The first member 100 is disposed inside the second member 110, and the outer circumferential surface 100A faces the inner circumferential surface 110A. Furthermore, the central axis of the outer circumferential surface 100A coincides with the central axis of the inner circumferential surface 110A. Further, the outer circumferential surface 100A faces the inner circumferential surface 110A, and a minute cylindrical gap S is formed between the outer circumferential surface 110A and the inner circumferential surface 110A. The sealing member 1 according to the present embodiment seals the gap S. The member 110 has a groove 112 along the circumferential direction on the inner circumferential surface 110A. Although the groove part 112 is a rectangular shape by the cross sectional view in the example of FIG. 1, it is not limited to this.

  The sealing member 1 according to the present embodiment is provided in the groove 112. The sealing member 1 is an annular member extending along a circumferential direction around the central axis AX. Hereinafter, an axial direction along the central axis AX is referred to as an axial direction X. The central axis AX can be said to be the central axis of the outer circumferential surface 100A and the inner circumferential surface 110A in a state where the sealing member 1 is attached to the second member 110. In this case, the axial direction X is the movement direction of the first member 100. The axial direction X includes a direction X1 along the central axis AX, and a direction X2 opposite to the direction X1 along the central axis AX. Further, a radial direction orthogonal to the central axis AX and a direction toward the outer side (a direction away from the central axis AX) is taken as a direction R1, and a direction toward the inner side (a direction toward the central axis AX) is taken as a direction R2. . The direction R1 is a radially outward direction, and the direction R2 is a radially inward direction. Further, when viewed from the axial direction X, a circumferential direction about the central axis AX is taken as a circumferential direction C.

  The sealing member 1 seals the gap S between the first member 100 and the second member 110 to suppress the leakage of fluid such as oil and fuel from the gap S. As shown in FIG. 1, the sealing member 1 has a lip member 10 and a spring member 12. The lip member 10 is a member made of resin, more specifically, made of PTFE (Polytetrafluoroethylene polytetrafluoroethylene). The lip member 10 is optional as long as the material contains PTFE. The lip member 10 may be a member manufactured by blending a filler such as carbon fiber, glass fiber, bronze powder and the like with PTFE powder. In addition, the spring member 12 is made of metal, and in the present embodiment, it is stainless steel. However, the material of the spring member 12 is not limited to stainless steel.

  As shown in FIG. 1, the lip member 10 has a proximal end 20, an outer lip 22 and an inner lip 24. The proximal end 20 is an annular member extending along the circumferential direction C. The outer lip portion 22 is a portion extending from the outer peripheral portion on the direction R1 side of the proximal end portion 20 toward the direction X1. The outer lip 22 extends from the distal end 22A connected to the outer periphery of the proximal end 20 to the distal end 22B in the direction X1. Further, the outer lip portion 22 is provided over the entire circumference of the proximal end portion 20. The inner lip portion 24 is a portion extending from the inner peripheral portion on the direction R2 side of the proximal end portion 20 toward the direction X1. The inner lip portion 24 extends in the direction X1 from the distal end portion 24A connected to the inner peripheral portion of the proximal end portion 20 to the distal end portion 24B. Further, the inner lip portion 24 is provided around the entire circumference of the proximal end portion 20. The inner lip portion 24 has a protrusion 26B. The protrusion 26B protrudes in the direction R1 from the surface on the direction R1 side of the tip 24B (a surface 34 described later).

  Further, the inner lip portion 24 is disposed to be separated from the outer lip portion 22 in the direction R2. A storage groove 28 is formed between the inner lip 24 and the outer lip 22. That is, the housing groove 28 is surrounded by the surface 32 on the direction R1 side of the outer lip portion 22, the surface 34 on the direction R1 side of the inner lip portion 24, and the surface 36 on the direction X1 side of the base end portion 20. The X1 side is an open groove. The storage groove 28 is provided along the circumferential direction C, around the entire circumference of the proximal end portion 20. In addition, the surface 34 inclines so that it may go to the direction R2 side as it goes to the direction X1 side. The surface 32 is inclined to the direction R1 side as it goes to the direction X1 side.

  As shown in FIG. 1, the spring member 12 is disposed in the storage groove 28 of the lip member 10. The spring member 12 has a bottom portion 40, an outer pressing portion 42, an inner pressing portion 44, an outer guide portion 46, and an inner guide portion 48. In the storage groove 28, the spring member 12 contacts the surface 32 of the storage groove 28 to press the surface 32. That is, the outer pressing portion 42 presses the outer lip portion 22 in the direction R1. As a result, the outer lip 22 contacts the surface of the groove 112 of the second member 110 by pressing the inner circumferential surface 112A of the groove 112 as the tip 22B deforms in the direction R1. Further, in the spring member 12, the inner pressing portion 44 contacts the surface 34 of the storage groove 28 to press the surface 34. That is, the inner pressing portion 44 presses the inner lip portion 24 in the direction R2 side. Thereby, the inner lip portion 24 contacts the inner peripheral surface 100A of the first member 100 by pressing the inner peripheral surface 100A by the distal end portion 24B deforming in the direction R2 side. Thus, the spring member 12 causes the lip member 10 to have the first member 100 and the second member by pressing the outer lip 22 against the second member 110 and pressing the inner lip 24 against the first member 100. The gap S with 110 is sealed.

  The structure of the spring member 12 will be described in more detail below. 2, 3A and 3B are schematic views of the spring member according to the present embodiment. FIG. 4 is a schematic view showing the spring member attached to the lip member. FIG. 2 is a plan view of a state in which the spring member 12 is developed, and shows a state before the spring member 12 is subjected to bending processing. FIG. 3A is a perspective view showing a state after the bending process is performed on the spring member 12, and FIG. 3B is a cross-sectional view showing a state after the bending process is performed on the spring member 12. FIG. 4 shows a state in which the spring member 12 that has been bent as shown in FIGS. 3A and 3B is attached to the lip member 10. The spring member 12 is formed into a flat plate shape as shown in FIG. 2 by, for example, cutting a metal plate. Then, the flat spring member 12 shown in FIG. 2 is bent to be shaped as shown in FIGS. 3A and 3B.

  First, the shape of the spring member 12 will be described based on FIG. As shown in FIG. 2, the bottom portion 40 is an annular portion extending along the circumferential direction C centering on the central axis AX. The bottom portion 40 has an outer peripheral portion 40A which is an end surface on the outer peripheral side, and an inner peripheral portion 40B which is an end surface on the inner peripheral side. The outer peripheral side is the direction R1 side, and the inner peripheral side is the direction R2 side.

  A plurality of outer pressing portions 42 are provided on the bottom 40 along the circumferential direction C. The outer pressing portion 42 protrudes from the outer peripheral portion 40A of the bottom portion 40 in the direction R1, that is, radially outward. More specifically, the outer pressing portion 42 extends along the direction R1 from the proximal end 42A connected to the outer peripheral portion 40A to the distal end 42B. In the outer pressing portion 42, the tip end portion 42B is separated from the other members of the spring member 12. In other words, the outer pressing portion 42 is disconnected at the tip portion 42B. Here, the length of the base end 42A along the circumferential direction C is referred to as width W1A, and the length of the tip 42B along the circumferential direction C is referred to as width W1B. In this case, the width W1B is longer than the width W1A. More specifically, the length along the circumferential direction C increases in the outer pressing portion 42 from the proximal end 42A toward the distal end 42B.

  A plurality of inner pressing portions 44 are provided on the bottom 40 along the circumferential direction C. The inner pressing portion 44 protrudes from the inner circumferential portion 40B of the bottom portion 40 in the direction R2, that is, radially inward. More specifically, the inner pressing portion 44 extends along the direction R2 from the proximal end 44A connected to the inner circumferential portion 40B to the distal end 44B. In the inner pressing portion 44, the tip end 44 </ b> B is separated from the other members of the spring member 12. In other words, the inner pressing portion 44 is interrupted at the tip end 44B. Here, the length of the base end 44A along the circumferential direction C is referred to as width W2A, and the length of the tip 44B along the circumferential direction C is referred to as width W2B. In this case, the width W2B is longer than the width W2A. More specifically, the length along the circumferential direction C increases in the inner pressing portion 44 from the proximal end 44A toward the distal end 44B.

  One outer pressing portion 42 and one inner pressing portion 44 form a pair, and project from the same position of the bottom portion 40 in the circumferential direction C. In other words, the central axis AX1 along the direction R1 coincides with the pair of outer pressing portions 42 and the inner pressing portions 44. That is, it can be said that the pair of outer pressing portions 42 and the inner pressing portions 44 form the pressing portions 45. The plurality of pressing portions 45 are provided at equal pitches along the circumferential direction C.

  A plurality of outer guide portions 46 are provided in the bottom portion 40 along the circumferential direction C, and are provided at positions different from the outer pressing portion 42 in the circumferential direction C. The outer guide portion 46 projects from the outer peripheral portion 40A of the bottom portion 40 in the direction R1. More specifically, the outer guide portion 46 extends along the direction R1 from the proximal end 46A connected to the outer peripheral portion 40A to the distal end 46B. In the outer guide portion 46, the tip end portion 46B is separated from the other members of the spring member 12. In other words, the outer guide 46 is broken at the tip 46B. Here, the length of the base end 46A along the circumferential direction C is referred to as a width W3A, and the length (width) of the tip 46B along the circumferential direction C is referred to as a width W3B. In this case, the width W3B is shorter than the width W3A. More specifically, the outer guide portion 46 has a length along the circumferential direction C becoming shorter as it goes from the proximal end 46A to the distal end 46B. However, the relationship between the width W3A and the width W3B is not limited to the above. For example, the width of the outer guide portion 46 along the circumferential direction C may not be shorter as it goes from the proximal end 46A to the distal end 46B. In addition, although it is preferable that the outer side guide part 46 is provided with two or more, single may be sufficient.

  A plurality of inner guide portions 48 are provided in the bottom portion 40 along the circumferential direction C, and provided at a position different from the inner pressing portion 44 in the circumferential direction C. The inner guide portion 48 protrudes from the inner circumferential portion 40B of the bottom portion 40 in the direction R2. More specifically, the inner guide portion 48 extends along the direction R2 from the proximal end 48A connected to the inner circumferential portion 40B to the distal end 48B. In the inner guide portion 48, the tip end portion 48 </ b> B is separated from the other members of the spring member 12. In other words, the inner guide portion 48 is broken at the tip portion 48B. Here, the length of the proximal end portion 48A along the circumferential direction C is referred to as a width W4A, and the length along the circumferential direction C of the tip end portion 48B is referred to as a width W4B. In this case, the width W4B is shorter than the width W4A. More specifically, the inner guide portion 48 has a length along the circumferential direction C becoming shorter as it goes from the proximal end 48A to the distal end 48B. However, the relationship between the width W4A and the width W4B is not limited to the above. For example, the width of the inner guide portion 48 along the circumferential direction C may not be reduced from the proximal end 48A toward the distal end 48B. In addition, although it is preferable that the inner guide part 48 is provided with two or more, single may be sufficient.

  One outer guide portion 46 and one inner guide portion 48 are paired and project from the same position of the bottom portion 40 in the circumferential direction C. In other words, the central axes AX2 along the direction R1 coincide with the pair of outer guide portions 46 and the inner guide portions 48. The pair of outer guide portions 46 and the inner guide portion 48 project from the same position between the two pressing portions 45 in the circumferential direction C of the bottom portion 40. That is, although the pair of outer guide portions 46 and the inner guide portions 48 form the guide portions 49, it can be said that the guide portions 49 are provided between the two pressing portions 45. Further, the plurality of guide portions 49 are provided at equal pitches along the circumferential direction C. Further, in the guide portion 49, the distances between the adjacent pressing portions 45 are equal along the circumferential direction C. Although one guide portion 49 is provided between the two pressing portions 45, a plurality of guide portions 49 may be provided between the two pressing portions 45.

  The shape of each part of the spring member 12 is as described above. Below, the relationship of the size of each part is explained.

  The width W1B of the tip end portion 42B of the outer pressing portion 42 is larger than the width W2B of the tip end portion 44B of the inner pressing portion 44. Further, in the outer pressing portion 42, the ratio of the length of the width W1B of the tip portion 42B to the width W1A of the base end portion 42A is the length W2B of the width W2B of the tip portion 44B to the width W2A of the base end 44A Is larger than the ratio of Furthermore, the angle θa between the sides of the outer pressing portion 42 in the circumferential direction C is larger than the angle θb of the sides of the inner pressing portion 44 in the circumferential direction C.

  The width of the outer guide portion 46 in the circumferential direction C is smaller than the width of the outer pressing portion 42 and the inner pressing portion 44 in the circumferential direction C. More specifically, the width W3A of the proximal end 46A of the outer guide portion 46 is smaller than the width W1A of the outer pressing portion 42 and the width W2A of the inner pressing portion 44.

  The width in the circumferential direction C of the inner guide portion 48 is also smaller than the width in the circumferential direction C of the outer pressing portion 42 and the inner pressing portion 44. More specifically, the width W4A of the proximal end portion 48A of the inner guide portion 48 is smaller than the width W1A of the outer pressing portion 42 and the width W2A of the inner pressing portion 44. The width of the inner guide portion 48 in the circumferential direction C is the same as the width of the outer guide portion 46 in the circumferential direction C. The width W4A of the inner guide portion 48 and the width W3A of the outer guide portion 46 are, for example, 0.3 mm or more.

  Here, the length from the proximal end 42A to the distal end 42B of the outer pressing portion 42 along the direction R1 is taken as a length L1. Further, the length from the proximal end 44A to the distal end 44B of the inner pressing portion 44 along the direction R1 is taken as a length L2. Further, the length from the proximal end 46A to the distal end 46B of the outer guide 46 along the direction R1 is taken as a length L3. Further, the length from the proximal end 48A to the distal end 48B of the inner guide 48 along the direction R1 is taken as a length L4. In this case, the length L3 of the outer guide portion 46 is shorter than the length L1 of the outer pressing portion 42 and the length L2 of the inner pressing portion 44. Further, the length L 4 of the inner guide portion 48 is also shorter than the length L 1 of the outer pressing portion 42 and the length L 2 of the inner pressing portion 44. The length L3 of the outer guide portion 46 and the length L4 of the inner guide portion 48 are the same.

  In addition, the relationship of the magnitude | size of each part of the spring member 12 is not limited to what was mentioned above.

  The flat spring member 12 shown in FIG. 2 is bent at the outer peripheral portion 40A and the inner peripheral portion 40B of the bottom portion 40 (in FIG. 2, valley folding). More specifically, the outer pressing portion 42 is bent at the proximal end 42A such that the surface is at an acute angle to the surface of the bottom 40. As a result, as shown in FIGS. 3A and 3B, the outer pressing portion 42 has a shape extending from the proximal end 42A to the distal end 42B in the direction R1 in the direction X1. In addition, the inner pressing portion 44 is bent at the base end portion 44A such that the surface has an acute angle with the surface of the bottom portion 40. As a result, as shown in FIGS. 3A and 3B, the inner pressing portion 44 has a shape extending from the proximal end 44A to the distal end 44B in the direction R2 in the direction X1.

  On the other hand, the outer guide portion 46 is not bent at the proximal end 46A. That is, as shown in FIG. 3B, the outer guide portion 46 remains in the shape extending in the direction R1 from the proximal end 46A to the middle portion 46C (the shape in FIG. 2 remains). The middle portion 46C is a portion between the proximal end 46A and the distal end 46B of the outer guide portion 46 and is closer to the distal end 46B than the proximal end 46A. However, as shown in FIG. 3B, the outer guide portion 46 is bent in the direction X1 in the middle portion 46C. That is, in this case, the outer guide portion 46 extends in the direction R1 from the proximal end 46A to the intermediate portion 46C in the vicinity of the distal end 46B, and from the vicinity of the intermediate portion 46C to the distal end 46B in the direction X1. Extend towards In the outer guide portion 46, the end surface 46D is a surface on the direction R1 side from the intermediate portion 46C to the tip end portion 46B, and the end surface 46D contacts the storage groove 28 of the lip member 10. The end face 46D is planar. However, the outer guide portion 46 may not necessarily be bent at the middle portion 46C, and may extend in the direction R1 from the proximal end 46A to the distal end 46B.

  Similarly, the inner guide 48 is not bent at the proximal end 48A. That is, as shown in FIG. 3B, the inner guide portion 48 remains in the shape extending in the direction R2 from the proximal end portion 48A to the middle portion 48C (the shape in FIG. 2 remains). The intermediate portion 48C is a portion between the proximal end 48A and the distal end 48B of the inner guide portion 48, and is a portion closer to the distal end 48B than the proximal end 48A. However, as shown in FIG. 3B, the inner guide portion 48 is bent in the direction X1 side at the intermediate portion 48C. That is, in this case, the inner guide portion 48 extends in the direction R2 from the proximal end portion 48A to the intermediate portion 48C near the distal end portion 48B, and in the direction X1 from the intermediate portion 48C to the distal end portion 48B. Extends towards. In the inner guide portion 48, a surface on the direction R1 side from the intermediate portion 48C to the tip portion 48B is an end surface 48D, and the end surface 48D is in contact with the storage groove 28 of the lip member 10. The end face 48D is planar. However, the inner guide portion 48 may not necessarily be bent at the intermediate portion 48C, and may extend in the direction R2 from the proximal end 48A to the distal end 48B.

  In such a bent state, in the spring member 12, the tip end portion 42B of the outer pressing portion 42 and the tip end portion 44B of the inner pressing portion 44 are more than the tip portion 46B of the outer guide portion 46 and the tip portion 48B of the inner guide portion 48. , In the direction X1 side. In other words, in the spring member 12, the tip end portion 46 B of the outer guide portion 46 and the tip end portion 48 B of the inner guide portion 48 extend in the axial direction X more than the tip end portion 42 B of the outer pressing portion 42 and the tip portion 44 B of the inner pressing portion 44. At a position close to the bottom 40.

  The length from the end face 46D of the inner guide portion 48 to the end face 48D of the outer guide portion 46 along the direction R1 is a length L5. Then, the length from the surface 32 to the surface 34 on the surface 36 side of the storage groove 28 of the lip member 10 along the direction R1 is a length L0 (see FIG. 1). In this case, the length L5 is longer than the length L0, for example, 0.05 mm longer than the length L0. The position of the length L0, that is, the position on the surface 36 side of the storage groove 28 is a position at which the inner guide portion 48 and the outer guide portion 46 are disposed.

  Here, the angle between the extending direction of the outer pressing portion 42 (the direction from the base end portion 42A to the tip end portion 42B) and the central axis AX is an angle θ1, and the extending direction of the inner pressing portion 44 (base end portion An angle between the direction 44A to the tip 44B) and the central axis AX is an angle θ2 (see FIG. 4). Further, the angle between the extending direction of the outer guide portion 46 (the direction from the base end 46A to the tip end 46B) and the central axis AX is taken as an angle θ3, and the extension direction of the inner guide portion 48 (base end 48A). The angle between the direction from the tip to the tip 48B) and the central axis AX is an angle .theta.4 (see FIG. 4). In this case, in the bent state, the angle θ3 is larger than the angles θ1 and θ2, and the angle θ4 is larger than the angles θ1 and θ2. The angles θ1 and θ2 are acute angles, and the angles θ3 and θ4 are obtuse angles. Although FIG. 4 is a view after the spring member 12 is attached to the lip member 10, the angles θ1, θ2, θ3 and θ4 here are in a state where the spring member 12 shown in FIG. 3 is bent. , Refers to the angle when the spring member 12 is not attached to the lip member 10.

  As shown in FIG. 4, the spring member 12 is stored in the storage groove 28 of the lip member 10 in a bent state. Here, when the spring member 12 is bent, the length along the direction R1 from the tip end 42B of the outer pressing portion 42 to the tip end 44B of the inner pressing portion 44 is along the direction R1 of the storage groove 28 Is greater than L0. Therefore, when the spring member 12 is stored in the storage groove 28, the tip 42 B of the outer pressing portion 42 contacts the surface 32 of the outer lip 22 and is pushed in the direction R 2 by the outer lip 22. Thereby, the outer side pressing portion 42 is further bent in the direction R2 side from the base end portion 42A. Therefore, the outer pressing portion 42 generates a force returning to the direction R1 side, that is, a pressing force to the direction R1 side, and presses the outer lip portion 22 in the direction R1 side. Similarly, in the inner pressing portion 44, the tip end portion 44B contacts the surface 34 of the inner lip portion 24, and is pressed by the inner lip portion 24 in the direction R1. As a result, the inner pressing portion 44 is further bent in the direction R1 side from the base end portion 44A. Therefore, the inner pressing portion 44 generates a force that returns in the direction R2, that is, a pressing force in the direction R2, and presses the surface 34 (inner lip portion 24) in the direction R2. Thereby, the lip member 10 seals the gap S between the first member 100 and the second member 110.

  Furthermore, the end face 46D contacts the surface 32 of the outer lip portion 22 at a position closer to the outer guide portion 46 in the direction X2 than the tip end portion 42B of the outer pressing portion 42. Similarly, the end face 48D contacts the surface 34 of the inner lip portion 24 at a position closer to the direction X2 than the tip end portion 44B of the inner pressing portion 44. Further, as described above, the angle θ3 and the angle θ4 of the outer guide portion 46 and the inner guide portion 48 are larger than the angle θ1 and the angle θ2. Accordingly, the outer guide portion 46 and the inner guide portion 48 are less likely to be deformed or bent in more detail than the outer pressing portion 42 and the inner pressing portion 44. Thus, the spring member 12 is fixed in position relative to the surface 32 as the outer guide 46 properly presses the surface 32 of the outer lip 22. Similarly, the spring member 12 is fixed relative to the surface 34 as the inner guide portion 48 properly presses the surface 34 of the inner lip portion 24. Thus, the sealing member 1 is fixed in position with respect to the lip member 10 by the outer guide portion 46 and the inner guide portion 48.

  Here, a comparative example will be described. FIG. 5: is a schematic diagram which shows the example of attachment of the sealing member which concerns on a comparative example. As shown in FIG. 5, the spring member 12 </ b> X according to the comparative example does not have a guide portion (the outer guide portion 46 and the inner guide portion 48). In this case, the spring member 12X may not be fixed at an appropriate position in the storage groove 28X, and may tilt in the storage groove 28X. In this case, the spring member 12X can not appropriately apply a pressing force to the outer lip 22X and the inner lip 24X, which may reduce the sealing performance. For example, FIG. 5 shows an example in which the spring member 12X is inclined to the inner lip portion 24X side, and there is a possibility that the pressing force to the outer lip portion 22X is insufficient.

  On the other hand, in the sealing member 1 according to the present embodiment, since the outer guide portion 46 and the inner guide portion 48 can contact the outer lip portion 22 and the inner lip portion 24, the spring member 12 is the outer lip portion It is possible to suppress the inclination to either the 22 side or the inner lip 24 side. In the sealing member 1, since the length L5 is longer than the length L0, that is, the guide portion 49 is longer than the storage groove 28, the outer guide portion 46 and the inner guide portion 48 press the outer lip portion 22 and the inner lip portion 24. Then, the spring member 12 is fixed to the lip member 10 with a small inclination. As described above, the sealing member 1 according to the present embodiment can suppress the inclination of the spring member 12 by the outer guide portion 46 and the inner guide portion 48, and can suppress the decrease in sealing performance.

  As explained above, the spring member 12 which concerns on this embodiment is a spring member used for the sealing member 1 which seals between the 1st member 100 and the 2nd member 110 which move relatively. The spring member 12 has a bottom portion 40, an outer pressing portion 42, an inner pressing portion 44, an outer guide portion 46, and an inner guide portion 48. The bottom portion 40 has an annular shape extending along the circumferential direction C around the central axis AX. A plurality of outer pressing portions 42 are provided on the bottom 40 along the circumferential direction C, and extend in the direction R1 from the base end 42A connected to the bottom 40 to the tip 42B. The outer pressing portion 42 generates a pressing force in the direction R1 by being pressed in the direction R2. A plurality of inner pressing portions 44 are provided in the bottom 40 along the circumferential direction C, and extend in the direction R2 from the base end 44A connected to the bottom 40 to the tip 44B. The inner pressing portion 44 generates a pressing force in the direction R2 by being pressed in the direction R1. The outer guide portion 46 extends from the proximal end 46A connected to the bottom 40 to the distal end 46B in the direction R1, and the length L3 is shorter than the length L1 of the outer pressing portion 42. Further, the inner guide portion 48 extends from the proximal end 48A connected to the bottom portion 40 to the distal end 48B in the direction R2, and the length L4 is shorter than the length L2 of the inner pressing portion 44.

  The spring member 12 can appropriately press the lip member 10 by suppressing the inclination of the spring member 12 by the outer guide portion 46 and the inner guide portion 48. Thereby, the spring member 12 can suppress the fall of the sealing performance of the lip member 10.

  Further, the outer guide portion 46 and the inner guide portion 48 have a shorter width along the circumferential direction C than the outer pressing portion 42 and the inner pressing portion 44. Since the width of the outer guide portion 46 and the inner guide portion 48 is short, the spring member 12 can suppress the inclination of the spring member 12 while suppressing the influence of the outer pressing portion 42 and the inner pressing portion 44 on the pressing force. it can. Therefore, the spring member 12 can press the lip member 10 more appropriately.

  Further, in the outer pressing portion 42 and the inner pressing portion 44, the widths W1B and W2B of the tip portions 42B and 44B along the circumferential direction C are greater than the widths W1A and W2A of the base ends 42A and 44A along the circumferential direction C. long. Further, in the outer guide portion 46 and the inner guide portion 48, the widths W3B and W4B of the tip portions 46B and 48B along the circumferential direction C are greater than the widths W3A and W4A along the circumferential direction C of the base ends 46A and 48A. short. The spring member 12 increases the widths of the tips of the outer pressing portion 42 and the inner pressing portion 44 for applying the pressing force, while reducing the widths of the tips of the outer guide portion 46 and the inner guide portion 48 used for fixing. doing. Accordingly, the spring member 12 can press the lip member 10 more appropriately by suppressing the inclination of the spring member 12 while appropriately applying a pressing force. Further, by forming the outer guide portion 46 and the inner guide portion 48 in a tapered shape, bending becomes easy, which is also advantageous in terms of processing.

  Further, the pair of outer pressing portions 42 and the inner pressing portions 44 protrude from the same position in the circumferential direction C of the bottom portion 40. The pair of outer guide portions 46 and the inner guide portion 48 project from between the pair of outer pressing portions 42 and the inner pressing portions 44 in the circumferential direction C of the bottom portion 40. The spring member 12 can suppress the inclination of the spring member 12 while appropriately applying a pressing force by providing the guide portion 49 between the two pressing portions 45. Thereby, the spring member 12 can press the lip member 10 more appropriately.

  Further, tip portions 46B and 48B of the outer guide portion 46 and the inner guide portion 48 are closer to the bottom portion 40 in the axial direction X) than the tip portions 42B and 44B of the outer pressing portion 42 and the inner pressing portion 44. The spring member 12 can be easily fixed by the lip member 10 by placing the outer guide portion 46 and the inner guide portion 48 at a position close to the bottom portion 40, and the lip member 10 can be pressed more appropriately.

  Further, the sealing member 1 according to the present embodiment has a resin-made lip member 10 and a spring member 12. The lip member 10 is an annular member having an annularly extending storage groove 28. The spring member 12 is disposed in the storage groove 28. The outer pressing portion 42 presses the outer circumferential surface (surface 32) of the storage groove 28, and the inner circumferential pressing portion 44 presses the inner circumferential surface (surface 34) of the storage groove 28. In the sealing member 1, when the spring member 12 includes the outer guide portion 46 and the inner guide portion 48, the inclination of the spring member 12 can be suppressed, and the decrease in sealing performance can be suppressed.

  Further, in the sealing member 1, the outer guide portion 46 contacts the outer peripheral surface (surface 32) of the storage groove 28, and the inner guide portion 48 contacts the inner peripheral surface (surface 34) of the storage groove 28. Thus, the spring member 12 is fixed to the lip member 10. In the sealing member 1, the inclination of the spring member 12 can be suppressed by the outer guide portion 46 and the inner guide portion 48, and the decrease in sealing performance can be suppressed.

  FIG. 6 is a view showing another example of the sealing member. As shown in FIG. 1, the lip member 10 of the present embodiment has a protrusion 26B. The protrusion 26 </ b> B is provided to prevent the spring member 12 from coming off the lip member 10. However, since the spring member 12 is fixed to the lip member 10 by the outer guide portion 46 and the inner guide portion 48, the protrusion 26B may not necessarily be provided. That is, as shown in FIG. 6, the sealing member 1A may have the lip member 10A which does not have the protrusion 26B.

  Further, in the present embodiment, middle portions 46C and 48C of the outer guide portion 46 and the inner guide portion 48 are bent in the direction X1 and contact the surfaces 32 and 34 of the lip member 10 at the end surfaces 46D and 48d. Thereby, the spring member 12 can suppress that the surface pressure to the surfaces 32 and 34 of the lip member 10 becomes excessive, and can suppress sticking to the surfaces 32 and 34 or the like. That is, the spring member 12 can be more appropriately contacted and pressed by the surfaces 32 and 34 of the lip member 10. However, as described above, the distal end portions 46B and 48B of the outer guide portion 46 and the inner guide portion 48 may not be bent in the direction X1. Even in this case, the spring member 12 can properly contact and press the surfaces 32 and 34 of the lip member 10. Further, the end faces 46D, 48d of the outer guide portion 46 and the inner guide portion 48 may be processed to properly contact the surfaces 32, 34, such as convex curved surface shapes.

  As mentioned above, although embodiment of this invention was described, embodiment is not limited by the content of this embodiment. Further, the above-described constituent elements include ones that can be easily conceived by those skilled in the art, substantially the same ones, and so-called equivalent ranges. Furthermore, the components described above can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the scope of the embodiments described above.

Reference Signs List 1 sealing member 10 lip member 12 spring member 22 outer lip portion 24 inner lip portion 28 storage groove 40 bottom portion 42 outer pressing portion 44 inner pressing portion 46 outer guide portion 48 inner guide portion 42A, 44A, 46A, 48A base end portion 42B , 44B, 46B, 48B tip 100 first member 110 second member

Claims (7)

It is a spring member used for a sealing member which seals between two members which move relatively,
An annular bottom extending along a circumferential direction about the central axis;
An outer pressing portion provided in the bottom portion along the circumferential direction and extending outward in the radial direction orthogonal to the central axis from the proximal end portion connected to the bottom portion to the distal end portion;
An inner pressing portion provided in the bottom portion along the circumferential direction and extending inward in the radial direction perpendicular to the central axis from the proximal end portion connected to the bottom portion to the distal end portion;
The proximal end portion connected to the bottom portion extends from the proximal end portion to the distal end portion, and the length from the proximal end portion to the distal end portion corresponds to the proximal end portion of the outer pressing portion. An outer guide shorter than the length to the tip,
It extends radially inward from the proximal end connected to the bottom to the distal end, and the length from the proximal end to the distal end extends from the proximal end of the inner pressing portion to the distal end. An inner guide shorter than the length to the tip,
, A spring member.   The spring member according to claim 1, wherein the outer guide portion and the inner guide portion have a width along the circumferential direction shorter than the outer pressing portion and the inner pressing portion. In the outer pressing portion and the inner pressing portion, the width of the tip end along the circumferential direction is longer than the width of the base end along the circumferential direction,
The width of the said tip part along the said circumferential direction is shorter than the width | variety of the said base part along the said circumferential direction about the said outer side guide part and the said inner side guide part. Spring member. The pair of outer pressing portions and the inner pressing portions protrude from the same position in the circumferential direction of the bottom portion,
The pair of outer guide portions and the inner guide portion project from between the pair of outer pressing portions and the inner pressing portions in the circumferential direction of the bottom portion. Spring member as described in.   The tip end portions of the outer guide portion and the inner guide portion are closer to the bottom portion in the axial direction along the central axis than the tip portions of the outer pressing portion and the inner pressing portion. The spring member according to any one of claims 4. A spring member according to any one of claims 1 to 5 and a lip member made of resin,
The lip member is an annular member having an annularly extending storage groove,
The spring member is disposed in the storage groove, and the outer pressing portion presses the outer peripheral surface of the storage groove, and the inner peripheral pressing portion presses the inner peripheral surface of the storage groove. , Sealing member.   The sealing member according to claim 6, wherein the outer guide portion is in contact with an outer peripheral surface of the storage groove, and the inner guide portion is in contact with an inner peripheral surface of the storage groove.

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