JP4788634B2 - Seal ring - Google Patents

Description

  The present invention relates to an end seal ring separated at one place.

  Conventionally, a sealing ring 100 as shown in FIG. 7 is known as a sealing device that seals an annular gap between two members assembled in a hydraulic device or the like so as to be relatively rotatable. FIG. 7 is a schematic cross-sectional view showing a mounting state of the seal ring 100 according to the prior art.

  The seal ring 100 is a member having a substantially annular shape, and seals the annular gap 400 between the housing 200 and the shaft 300 inserted into the shaft hole 201 of the housing 200.

  The seal ring 100 is mounted in an annular groove 301 provided in the shaft 300 and is pushed to the non-sealing target fluid side A by the hydraulic pressure P acting from the sealing target fluid side O. The outer peripheral surface 101 is in close contact with the inner peripheral surface of the shaft hole 201 of the housing 200, and the end surface 102 on the non-sealing target fluid side A is in close contact with the side wall surface 302 on the non-sealing target fluid side A of the annular groove 301 of the shaft 300. . Thereby, leakage of oil such as lubricating oil from the sealing target fluid side O to the non-sealing target fluid side A is suppressed.

  Such a seal ring 100 used in a hydraulic device is generally an end-shaped one separated at one place on the circumference in order to improve the mounting property. As the shape of the separation portion S of the seal ring 100, a special step cut as shown in FIG. 8 is known. FIG. 8 is a schematic perspective view showing the configuration of the separation portion S of the seal ring 100 according to the prior art.

  The separation portion S of the seal ring 100 is provided with a convex portion 103 at one end portion and a concave portion 104 combined with the convex portion 103 at the other end portion. The separation portion S is joined by the fitting of the convex portion 103 and the concave portion 104, and an annular seal ring 100 is formed.

  Sliding seal surfaces 105a and 105b that are slidable in the circumferential direction are formed in the fitting portion of the separation portion S by the contact between the side surfaces 103a and 103b of the convex portion 103 and the side surfaces 104a and 104b of the concave portion 104. In addition, a gap 106 that can absorb a change in the circumferential length of the seal ring is formed between the front end surface 103 c of the convex portion 103 and the bottom surface 104 c of the concave portion 104.

  Therefore, even if the circumferential length of the seal ring 100 changes due to a temperature change or the like, the side surfaces 103a and 103b of the convex portion 103 and the side surfaces 104a and 104b of the concave portion 104 slide in the circumferential direction so that the separation portion S By expanding and contracting in the circumferential direction (the arrow direction in FIG. 7), it is possible to absorb the change in the circumferential length of the seal ring 100.

  Further, even when the circumferential length is changed, the state in which the side surfaces 103a and 103b of the convex portion 103 are in contact with the side surfaces 104a and 104b of the concave portion 104 (the state in which the sliding seal surfaces 105a and 105b are formed) is maintained. Therefore, there is no gap in the separation portion S such that the sealing target fluid side O and the non-sealing target fluid side A communicate with each other.

Related techniques include those shown in the following documents.
Japanese Patent Laid-Open No. 10-82466 Japanese Patent Laid-Open No. 2005-9663

  The seal ring as described above is generally designed so that each sliding surface in the separation part is in close contact as a seal surface, and when the gap formed in the separation part is open to some extent, The shape is made to be a perfect circle.

  Therefore, when the separation portion S is closed until the gap 106 disappears when the seal ring 100 is attached to the annular groove 301, the shaft 300 is configured concentrically even if hydraulic pressure is applied during use. The side surface 103b of the convex portion 103, which is a sliding surface, and the side surface 104b of the concave portion 104 are caught. The interference between the convex portion 103 and the concave portion 104 prevents the separation portion S from being sufficiently expanded and seals. Function may be impaired.

  That is, when the separation portion S expands, not only relative movement in the circumferential direction but also movement that is displaced in the radial direction due to the diameter expansion of the seal ring 100 occurs. Therefore, as shown in FIG. 9, a state in which the root side portion 103 d of the side surface 103 b of the convex portion 103 and the opening side portion (a portion facing the root side portion 103 d) 104 d of the side surface 104 b of the concave portion 104 are caught. In other words, the expansion of the separation part S may be hindered.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a seal ring that enables a smooth expansion of the separating portion.

In order to achieve the above object, the seal ring in the present invention comprises:
Having an end-shaped shape separated at one place,
The both end portions are configured to be fitable by a convex portion provided at one end portion of both end portions and projecting in the circumferential direction and a concave portion provided at the other end portion and combined with the convex portion,
In the fitting portions of the both end portions, a sliding surface in which each end portion is slidable in the circumferential direction and a gap capable of absorbing a change in the circumferential length of the seal ring are formed,
In the seal ring that expands in the circumferential direction and expands the diameter when the fitted separation part receives a force in the outer diameter direction on the inner peripheral surface of the seal ring,
In the side surface of the convex portion that forms a concentric sliding surface with respect to the axis among the sliding surfaces, a portion other than the portion on the tip side of the convex portion is separated from the side surface of the concave portion that slides with the side surface. It is characterized by being recessed.

  Thereby, when the separating portion expands, the portion where the convex portion slides with the concave portion on the side surface concentric with the axis is only the tip side portion of the convex portion, and the root side portion does not contact. Therefore, when both ends are expanded from a completely fitted state, the interference between the convex portion and the concave portion is suppressed, and the expansion of the fitting portion becomes smooth.

In order to achieve the above object, the seal ring in the present invention is
A seal ring that is mounted in an annular groove provided in one of a housing having a shaft hole and a shaft inserted into the shaft hole and seals an annular gap between the two members;
The first seal surface that contacts the other member and the second seal surface that contacts the side surface of the annular groove, and has an end-shaped shape separated at one place,
The both end portions are configured to be fitable by a convex portion provided at one end portion of both end portions and projecting in the circumferential direction and a concave portion provided at the other end portion and combined with the convex portion,
In the fitting portions at both ends, each end portion is perpendicular to the shaft and slidable in the circumferential direction, and a second sliding surface concentric with the shaft and slidable in the circumferential direction. A dynamic seal surface is formed, and a gap that can absorb a change in the circumferential length of the seal ring is formed between the circumferentially opposed surfaces of the both ends.
In the seal ring that expands in the circumferential direction and expands the diameter when the fitted separation part receives a force in the outer diameter direction on the inner peripheral surface of the seal ring,
In the side surface of the convex portion that forms the second sliding seal surface, a portion other than the portion on the tip side of the convex portion is separated from the side surface of the concave portion that forms the second sliding seal surface together with the side surface. It is characterized by being recessed.

  Thereby, in the side surface of the convex part and the side surface of the concave part that form the second sliding seal surface, the part that slides when the fitting part expands is only the convex part tip side part, and the root side part does not contact. . Therefore, when both ends are expanded from a completely fitted state, interference between the convex portion and the concave portion is suppressed, and the fitting portion is smoothly expanded.

  Moreover, since the contact state between the tip side portion of the convex side surface forming the second sliding seal surface and the concave side surface is maintained, the sealing performance by the second sliding seal surface is not impaired.

  As described above, according to the present invention, the separation portion can be smoothly expanded.

  The best mode for carrying out the present invention will be exemplarily described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

(Example 1)
<Configuration and overview of seal ring>
First, with reference to FIG.1 and FIG.2, the structure and outline | summary of the seal ring which concern on Example 1 of this invention are demonstrated. FIG. 1 is a diagram showing an entire seal ring 1 according to the present embodiment, and shows a state in which the seal ring 1 is viewed from the axial direction. FIG. 2 is a cross-sectional view showing a use state of the seal ring 1 according to the present embodiment, and corresponds to the AA cross section of FIG.

  The seal ring 1 is a member configured in a substantially annular shape, and is separated at one place on the circumference (separation part 2). Separation part 2 is constituted so that the concavo-convex shape formed in each of one end part 3 and the other end part 4 can be fitted to each other.

  The seal ring 1 is made of a resin material. For example, polyether ether ketone (PEEK), tetrafluoroethylene resin (PTFE), ethylene-tetrafluoroethylene (ETFE) or the like is used.

  The seal ring 1 seals an annular gap between two members assembled so as to be relatively movable. Here, as shown in FIG. 2, the annular gap 7 between the housing 5 and the shaft 6 inserted into the shaft hole 50 of the housing 5 is sealed.

  The seal ring 1 is mounted in an annular groove 60 provided on the outer peripheral surface of the shaft 6 and is pushed to the non-sealing target fluid side A by the hydraulic pressure P acting from the sealing target fluid side O. The outer peripheral surface 10 is in close contact with the inner peripheral surface of the shaft hole 50 of the housing 5, and the end surface 11 on the non-sealing target fluid side A is in close contact with the side wall surface 61 on the non-sealing target fluid side A of the annular groove 60 of the shaft 6. .

  Thereby, the leakage of the sealing target fluid from the sealing target fluid side O to the non-sealing target fluid side A is suppressed. The fluid to be sealed is, for example, lubricating oil, and particularly ATF in the case of an automatic transmission of an automobile.

<Separation part>
Next, with reference to FIGS. 3-5, the structure of the isolation | separation part 2 of the seal ring 1 is demonstrated in detail. FIGS. 3A and 3B are diagrams showing the structure of the separation unit 2, in which FIG. 3A is a view from the axial direction, and FIG. 4A and 4B are diagrams illustrating a state in which the separation unit 2 is opened, in which FIG. 4A is a view from the axial direction, and FIG. FIG. 5 is a perspective view showing the shape of the separation unit 2. Hereinafter, of the two ends of the seal ring 1, one end (the left side in the figure) is referred to as a first end 3, and the other end (the right side) is referred to as a second end 4. To do.

  The first end 3 has a first end face 30 along the radial direction. The first end 3 includes a first protrusion 31 protruding in the circumferential direction from the first end face 30 and a first recess 32 recessed in the circumferential direction from the first end face 30. It is arranged side by side in the axial direction.

  The first convex portion 31 includes a side surface 31a extending concentrically with respect to the axis in the circumferential direction from the first end surface 30, a side surface 31b adjacent to the side surface 31a and extending perpendicularly to the axis, a side surface 31a, and A distal end surface 31c adjacent to the side surface 31b and extending in the radial direction.

  The side surface 31a is configured such that a portion other than the tip side portion of the first convex portion 31 is recessed in the outer diameter direction, and is retracted in the outer diameter direction from the tip side surface 31d and the tip side surface 31d. And the base side surface 31e.

  The first recess 32 includes a side surface 32a extending concentrically with respect to the axis in the circumferential direction from the first end surface 30, a side surface 32b adjacent to the side surface 32a and extending perpendicularly to the axis, and the side surface 32a and the side surface. A bottom surface 32c adjacent to 32b and extending in the radial direction.

  The side surface 31b of the first convex portion 31 and the side surface 32b of the first concave portion 32 are formed on the same plane, and form a first sliding surface 33 extending in the circumferential direction and extending perpendicularly to the axis. is doing.

  On the other hand, the second end 4 has the same shape as the first end 3. That is, the second end portion 4 is provided with a second end surface 40 extending in the radial direction, a second convex portion 41 projecting in the circumferential direction from the second end surface 40, and a second recess recessed in the circumferential direction from the second end surface 40. Two recesses 42 are provided side by side in the axial direction.

  The second convex portion 41 has a side surface 41a extending concentrically with respect to the axis, a side surface 41b extending perpendicularly to the axis, and a tip surface 41c along the radial direction, and the second concave portion 42. Has a side surface 42a extending concentrically with respect to the axis, a side surface 42b extending perpendicularly to the axis, and a bottom surface 42c along the radial direction.

  Further, the side surface 41a of the second convex portion 41 includes a tip side surface 41d and a root side surface 41e that recedes in the outer diameter direction from the tip side surface 41d. Further, the side surface 41b of the second convex portion 41 and the side surface 42b of the second concave portion 42 form a continuous second sliding surface 43 extending in the circumferential direction.

  Since both end portions 3 and 4 have the same shape, in the state where they face each other in the separation portion 2, the axial arrangement of the convex portions and the concave portions is reversed, and the first convex portion 31, the second concave portion 42, and the second convex portion 41 and the 1st recessed part 32 make a pair, respectively.

  The seal ring 1 makes it easy to mount the shaft 6 in the annular groove 60 by providing such a separation portion 2. That is, the seal ring 1 is dropped into the annular groove 60 of the shaft 6 with the separating portion 2 open (separated), and returns to a state where the separating portion 2 is closed (fitted) again by elastic restoring force. Thus, the annular groove 60 is mounted.

  When the shaft 6 to which the seal ring 1 is attached is inserted into the shaft hole 50 of the housing 5 and the pressure P is applied from the fluid side O to be sealed, the diameter of the seal ring 1 is increased by the expansion of the separating portion 2. The outer peripheral surface 10 is in close contact with the inner peripheral surface of the shaft hole 50 of the housing 5, the end surface 11 is in close contact with the side wall surface 61 of the annular groove 60 of the shaft 6, and the annular gap 7 between the housing 5 and the shaft 6. To seal.

  At this time, in the separation portion 2, the first sliding surface 33 of the first end portion 3 and the second sliding surface 43 of the second end portion 4 are in close contact, and the first sliding seal surface 12 is formed. The In addition, the outer peripheral surface 10 of the seal ring 1 is connected to the first end 3 side 10a and the second end 4 side 10b via the edge 12a of the first sliding seal surface 12 on the outer peripheral side of the seal ring. The configuration is as follows. Thereby, the continuous 1st sealing surface 14 which slidably contacts with the internal peripheral surface of the shaft hole 50 is formed.

  Further, in the separation portion 2, the second concave portion 42 and the first concave portion 41d are respectively formed as sliding surfaces by the tip side surface 31d of the side surface 31a of the first convex portion 31 and the tip side surface 41d of the side surface 41a of the second convex portion 41. The second sliding seal surface 13 is formed in close contact with the side surfaces 42a and 32a as the sliding surfaces of 32. Further, the end surface 11 on the non-sealing target fluid side A of the seal ring 1 is connected to the first end 3 side 11a and the second end via the end edge portion 13a on the non-sealing target fluid side A of the second sliding seal surface 13. The end 4 side 11b is connected. Thereby, the 2nd continuous seal surface 15 which adheres to the side wall surface 61 of the annular groove 60 is formed.

  By combining the sealing surfaces configured as described above, leakage of the fluid to be sealed in the separation unit 2 is prevented.

  Further, the separation portion 2 is designed so that a gap capable of absorbing a change in the circumferential length of the seal ring 1 is formed between the end faces of both end portions 3 and 4. That is, the seal ring 1 is sized so that the first convex portion 31 and the second convex portion 41 enter only halfway through the second concave portion 42 and the first concave portion 32 at normal temperature. Clearances 16 a and 16 b are formed between the tip surfaces 31 c and 41 c of the portion 31 and the second convex portion 41 and the bottom surfaces 42 c and 32 c of the second concave portion 42 and the first concave portion 32. Similarly, a gap 16 c is formed between the first end surface 30 and the second end surface 40.

  According to this configuration, when the temperature rises during the operation of the hydraulic equipment and the circumferential length of the seal ring 1 becomes long, the sliding surfaces slide in the circumferential direction so that both ends 3 and 4 are rotated. In the direction, the gaps 16a, 16b, and 16c decrease. Thereby, the increase in the circumference of the seal ring 1 is absorbed.

  Further, when the temperature decreases and the circumferential length of the seal ring 1 is shortened, the sliding surfaces slide in the circumferential direction in the opposite direction, and both end portions 3 and 4 are separated in the circumferential direction (separating portion). 2 expands in the circumferential direction), and the gaps 16a, 16b, and 16c increase. Thereby, the decrease in the circumference of the seal ring 1 is absorbed.

  Further, when the hydraulic pressure P acts on the seal ring 1 in the non-pressure state, or when the hydraulic pressure P increases and the force that the seal ring 1 is pressed against the inner peripheral surface side of the shaft hole 50 of the housing 5 becomes strong, A force in the diameter expansion direction acts on the seal ring 1. In this case, the separation portion 2 expands in the circumferential direction following the diameter expansion deformation of the seal ring 1 due to the hydraulic pressure P. Abnormal deformation or the like of the ring 1 is suppressed, and the posture of the seal ring 1 is stabilized.

  Further, since the sliding seal surfaces 12 and 13 maintain the surface contact state even when the separating portion 2 expands and contracts, the fluid to be sealed leaks in the separating portion 2 due to the expansion and contraction of the separating portion 2. No gap is formed.

  The seal ring 1 is designed so that the sliding surfaces of the separating portion 2 are completely in close contact with each other, and the gaps 16a, 16b, 16c formed in the separating portion 2 are opened to some extent. In addition, it is manufactured so that its shape is a perfect circle.

<Excellent points of this embodiment>
According to the seal ring 1 according to the present embodiment, the side surfaces 31a and 41a that are concentric with the axes of the convex portions 31 and 41 provided at the end portions 3 and 4 are portions other than the convex portion front end portion. However, it is comprised from the structure which was depressed in the outer-diameter direction, ie, the front end side surfaces 31d and 41d, and the base side surfaces 31e and 41e retreated in the outer diameter direction from the front end side surfaces 31d and 41d. Therefore, the state in which both end portions 3 and 4 are completely fitted, that is, the end surface 30, the front end surface 31c and the bottom surface 32c of the first end portion 3, and the end surface 40, the bottom surface 42c and the front end surface 41c of the second end portion 4 are as follows. In a fitted state where the gaps 16a, 16b, and 16c are eliminated by contact with each other, the base side portions of the side surfaces 31a and 41a are separated from the side surfaces 42a and 32a of the concave portions 42 and 32, respectively. As a result, when the separating portion 2 expands from the state in which both end portions 3 and 4 are completely fitted, in addition to the relative movement in the circumferential direction of each side surface, the seal ring 1 is displaced in the outer diameter direction due to the expanded diameter. Even if such a movement occurs, the convex portions 31 and 41 and the concave portions 42 and 32 interfere with each other, that is, the base side portion of the side surfaces 31a and 41a and the opening side portion of the side surfaces 42a and 32a are caught. Occurrence is suppressed.

  On the other hand, the tip side portions of the side surfaces 31a and 41a of the convex portions 31 and 41, that is, the tip side surfaces 31d and 41d are maintained in contact with the side surfaces 42a and 32a of the concave portions 42 and 32, so that the sealing performance is impaired. It will never be.

  In the present embodiment, the configuration in which the seal ring 1 is mounted in the annular groove 60 provided on the outer peripheral surface of the shaft 6 has been described, but the annular groove provided on the inner peripheral surface of the shaft hole 50 of the housing 5 is described. A configuration may be employed in which the annular gap 7 is sealed by contacting the side wall surface of the annular groove and the outer peripheral surface of the shaft 6.

  Further, the present invention can be applied to a separating portion 2 ′ of a so-called T-shaped cross-section type seal ring 1 ′ as shown in FIG. Needless to say, similar effects can be obtained. FIG. 6 is a diagram illustrating a configuration of a seal ring 1 ′ according to a modification of the first embodiment, where (a) is a state seen from the axial direction, (b) is a view as viewed from an arrow D in (a), A partial cross section is shown. Further, the seal ring 1 'separating portion 2' according to this modification has the same configuration as the separating portion 2 of the seal ring 1 of the first embodiment, and the description thereof is omitted.

1 is a diagram illustrating an entire seal ring according to Embodiment 1. FIG. Sectional drawing which shows the use condition of the seal ring of FIG. The figure which shows the structure of the isolation | separation part of the seal ring of FIG. The figure which shows a mode that the isolation | separation part of the seal ring of FIG. 1 was opened. The perspective view which shows the shape of the edge part of the seal ring of FIG. The figure which shows the structure of the seal ring which concerns on a modification. Sectional drawing which shows the use condition of the seal ring which concerns on a prior art. The perspective view which shows the structure of the isolation | separation part of the seal ring which concerns on a prior art. The figure explaining the problem of the seal ring which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seal ring 10 Outer peripheral surface 11 End surface 2 Separation part 3 1st end part 30 1st end surface 31 1st convex part 32 1st recessed part 4 2nd end part 40 2nd end surface 41 2nd convex part 42 2nd recessed part 5 Housing 50 Shaft hole 6 Shaft 60 Annular groove 61 Side wall surface 7 Annular gap

Claims (2)

Having an end-shaped shape separated at one place,
The both end portions are configured to be fitable by a convex portion provided at one end portion of both end portions and projecting in the circumferential direction and a concave portion provided at the other end portion and combined with the convex portion,
In the fitting portions of the both end portions, a sliding surface in which each end portion is slidable in the circumferential direction and a gap capable of absorbing a change in the circumferential length of the seal ring are formed,
In the seal ring that expands in the circumferential direction and expands the diameter when the fitted separation part receives a force in the outer diameter direction on the inner peripheral surface of the seal ring,
In the side surface of the convex portion that forms a concentric sliding surface with respect to the axis among the sliding surfaces, a portion other than the portion on the tip side of the convex portion is separated from the side surface of the concave portion that slides with the side surface. A seal ring characterized by being recessed. A seal ring that is mounted in an annular groove provided in one of a housing having a shaft hole and a shaft inserted into the shaft hole and seals an annular gap between the two members;
The first seal surface that contacts the other member and the second seal surface that contacts the side surface of the annular groove, and has an end-shaped shape separated at one place,
The both end portions are configured to be fitable by a convex portion provided at one end portion of both end portions and projecting in the circumferential direction and a concave portion provided at the other end portion and combined with the convex portion,
In the fitting portions at both ends, each end portion is perpendicular to the shaft and slidable in the circumferential direction, and a second sliding surface concentric with the shaft and slidable in the circumferential direction. A dynamic seal surface is formed, and a gap that can absorb a change in the circumferential length of the seal ring is formed between the circumferentially opposed surfaces of the both ends.
In the seal ring that expands in the circumferential direction and expands the diameter when the fitted separation part receives a force in the outer diameter direction on the inner peripheral surface of the seal ring,
In the side surface of the convex portion that forms the second sliding seal surface, a portion other than the portion on the tip side of the convex portion is separated from the side surface of the concave portion that forms the second sliding seal surface together with the side surface. A seal ring characterized by being recessed.

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