WO2008013281A1

WO2008013281A1 - Seal ring

Info

Publication number: WO2008013281A1
Application number: PCT/JP2007/064807
Authority: WO
Inventors: Hideya Watanabe
Original assignee: Nok Corporation
Priority date: 2006-07-27
Filing date: 2007-07-27
Publication date: 2008-01-31
Also published as: JPWO2008013281A1

Abstract

Provided is a seal ring which can be used as an inner circumference seal and an outer circumference seal. The seal ring is arranged in an annular space between a shaft and a housing. A cut section (7) is arranged at one area in the circumference direction of the seal ring, and a space (60) is formed at the cut section (7) to allow circumference length changes. The seal ring is provided with an outer circumference surface (2), an inner circumference surface (3), both side surfaces (5) connecting the circumference end of the outer circumference surface (2) and the circumference end of the inner circumference surface (3). A cross section of the seal ring, which is concentric with the shaft, and a cross section of the seal ring, which is vertical to the shaft, are continuous in the circumference direction of the seal ring, irrespective of the circumference length changes of the seal ring.

Description

Specification

Sino-Reling Technology

The present invention relates to a seal ring that seals an annular gap between two members.

Background art

Conventionally, this type of seal ring is used in a hydraulic apparatus such as an automatic transmission of an automobile. Hereinafter, the seal ring according to the conventional example will be described with reference to FIGS. 7 (a) to (f).

[0003] Fig. 7 (a) is an overall view of the seal ring, and Fig. 7 (b) is a seal view of the seal ring.

7 (c) is an enlarged view of the cut portion of the seal ring. Fig. 7 (d) is a sealing diagram of the cut portion of the seal ring, and Fig. 7 (e) is an enlarged view of the inner peripheral surface side of the cut portion of the seal ring.

7 (f) is a leak path diagram of the cut portion of the seal ring.

[0004] As shown in Fig. 7 (f), a special step cut is applied to the cut portion 700 of this type of seal ring. The arrow in Fig. 7 (f) indicates the oil leakage path from the sealed fluid side to the non-sealed fluid side.

[0005] The seal ring shown in Figs. 7 (a) to (f) is for sealing an annular gap between a housing 450 provided with a shaft hole and a shaft 460 inserted into the shaft hole. It is. Further, this seal ring is used by being mounted in an annular groove 150 provided in the shaft 460.

[0006] Further, the seal ring is formed of a resin material. This seal ring is a first seal surface (side surface of the seal ring) that seals the side wall surface of the annular groove 150 provided in the shaft 460.

101 and a second seal surface (outer peripheral surface of the sheathing) 400 that seals the inner peripheral surface of the shaft hole provided in the housing 450.

[0007] When a pressure force S is applied from the sealed fluid side (o) in the direction indicated by the arrow P in FIG. 7B, the seal ring is pressed to the non-sealed fluid side A. The direction of arrow P is the direction from the sealed fluid side O toward the unsealed fluid side A.

Accordingly, the first seal surface 101 presses the side wall surface of the annular groove 150. The second seal surface 400 presses the inner peripheral surface of the shaft hole provided in the housing 450. In this way, each The sealing surface is sealed at each position. As described above, the seal ring prevented leakage to the non-sealed fluid side A of the sealed fluid.

Here, as the sealing fluid, for example, lubricating oil is used. In particular, ATF is used as a sealing fluid when used in automobile transmissions.

[0010] Further, as shown in Fig. 7 (a), the ring body of the seal ring is provided with a cutting portion 700 force S at one place in the circumferential direction. One of the reasons for providing this cut part 700 is to improve the assemblability of the seal ring.

[0011] Various forms of the cut portion 700 are known. As an example of this form, there is a special step cutting force ^s cut in two steps as shown in FIG.

[0012] The seal ring having the special step cut can respond suitably even by a change in ambient temperature. The reason is as follows.

[0013] According to this special step cut, the surfaces (opposing surfaces) perpendicular to the circumferential direction of the end portions of the seal ring form a gap 300 with respect to the circumferential direction. The seal ring having the special step cut is configured to block the sealed fluid side and the non-sealed fluid side while having the gap 300.

[0014] Thereby, even if the ring body expands and contracts due to heat, the change in size can be absorbed by the gap 300 while maintaining the sealed state. Therefore, the seal ring having this special step cut can maintain the sealing performance even when the circumference of the seal ring changes due to the ambient temperature change.

[0015] As a related technique, there is one disclosed in Patent Document 1.

Patent Document 1: Japanese Patent Laid-Open No. 8-135797

Disclosure of the invention

Problems to be solved by the invention

[0016] However, the seal ring according to the conventional example has the following problems.

[0017] A seal ring that seals an annular gap between two members includes an outer peripheral seal and an inner peripheral seal. The outer peripheral seal is a seal configuration in which a seal ring is attached to the outer peripheral surface of the shaft to seal the annular gap between the outer peripheral surface of the shaft and the inner peripheral surface of the housing. This is a seal configuration in which a seal ring is attached to the inner peripheral surface of the shaft to seal the annular gap between the outer peripheral surface of the shaft and the inner peripheral surface of the housing. Here, the configuration of FIG. 7 (b) shows an outer peripheral seal.

[0018] When the seal ring described above is used as a peripheral seal, the first seal surface 101 exists between the sealed fluid side (o) and the non-sealed fluid side (A) as shown in Fig. 7 (b). The first seal surface 101 seals the leakage of the gap X.

[0019] According to this configuration, since the sealed fluid side (o) and the non-sealed fluid side (A) cannot communicate with each other through the gap X! /, The amount of oil leakage to the non-sealed fluid side (A) Can be reduced.

However, when the seal ring described above is used as an inner peripheral seal, as shown in FIG. 8, the inner peripheral surface of the seal ring has a cut shape that fits in a straight line. (o) and unsealed fluid side (A) communicate with each other through gap X. Therefore, it is difficult to reliably seal the annular gap.

That is, in the seal ring according to the above-described conventional example, a gap is formed on the inner peripheral surface of the seal ring so that the sealed fluid side and the non-sealed fluid side communicate with each other. Therefore, the seal ring is used as the inner peripheral seal. Is difficult.

[0022] The present invention has been made in view of the above situation, and in a seal ring in which a cut portion is provided in a part in the circumferential direction, the seal ring is used as an inner peripheral seal and an outer peripheral seal.

It is an object of the present invention to provide a seal ring that does not cause a gap between the sealed fluid side and the non-sealed fluid side even in the case of V, ru, or misalignment!

Means for solving the problem

[0023] In order to achieve the above object, the seal ring of the present invention is a seal ring that is provided in an annular gap between two relatively moving members and seals the annular gap. A cut part is provided at one place in the circumferential direction of the seal ring, and opposed faces in the circumferential direction are formed at both ends of the seal ring forming the cut part, so that a change in the circumferential length is allowed between the opposed faces. The seal ring includes an outer peripheral surface, an inner peripheral surface, and both side surfaces connecting the peripheral edge of the outer peripheral surface and the peripheral edge of the inner peripheral surface, regardless of changes in the peripheral length of the seal ring. The cross-sectional force of the seal ring concentric with the shaft is a configuration that continues in the circumferential direction of the seal ring at any position in the radial direction of the seal ring, In addition, the cross-sectional force of the seal ring perpendicular to the shaft is characterized in that it is configured to be continuous over the circumferential direction of the seal ring at any position in the radial direction of the seal ring.

[0024] According to this configuration, even in a configuration in which a gap is provided between the opposing surfaces in the circumferential direction forming the cut portion so as to allow a change in the circumferential length of the seal ring, the seal concentric with the shaft is provided. The cross section of the ring is configured to be continuous over the circumferential direction of the seal ring at any position in the radial direction of the seal ring, and the cross section of the seal ring perpendicular to the shaft is any of the radial direction of the seal ring. Even in the position, since the structure is continuous over the circumferential direction of the seal ring, there is no gap that communicates from the sealed fluid side to the non-sealed fluid side via the gap in the cut portion. Therefore, even when used as an inner peripheral seal or an outer peripheral seal, it is possible to securely seal between the shaft and the housing.

[0025] Further, at each end of the seal ring, there are an outer peripheral surface, an opposing surface extending radially inward from the circumferential edge of the outer peripheral surface, and a radial direction from the radially inner edge of the opposing surface. A cylindrical surface substantially concentric with the shaft, an opposing surface extending from a circumferential edge of the cylindrical surface to a radially inner edge of the inner circumferential surface, and an inner circumferential surface. The step shape is displaced in the circumferential direction of the seal ring, with the separation surface connecting the end portion of the seal ring in the axial direction as a boundary. The seal ring has a configuration in which one end of the seal ring has a stepped shape with a convex inner peripheral surface, and the other end of the seal ring has a stepped shape with a convex outer peripheral surface. In a state where both ends of the seal ring are fitted, the separation surface provided at each end and the cylindrical surface are in contact with each other. It is good to have a configuration that does this.

[0026] According to this configuration, the force S can be obtained by moving each end portion in the radial direction in the cut portion of the seal ring. Therefore, it becomes possible to improve the wearability of the seal ring.

The invention's effect

[0027] As described above, according to the present invention, in a seal ring in which a cut portion is provided in a part in the circumferential direction, the seal ring is used as an inner peripheral seal and an outer peripheral seal. It is possible to provide a seal ring without creating a gap where the sealed fluid side and the non-sealed fluid side communicate with each other! Brief Description of Drawings

Garden 1] Schematic configuration diagram of the shape of the cut portion of the seal ring according to the present embodiment. Garden 2] Diagram showing a cross section concentric with the shaft of the seal ring according to the present embodiment. Garden 3] According to the present embodiment. Figure showing a cross section perpendicular to the axis of the seal ring

4] A diagram showing a method of attaching the seal ring according to the present embodiment

5] Overall view of the seal ring according to this embodiment

6] Schematic configuration diagram of the seal ring according to the present embodiment mounted in the annular groove [FIG. 7] Schematic configuration diagram of the cut portion of the seal ring according to the conventional example

[FIG. 8] Schematic configuration diagram of the cut portion of the seal ring according to the conventional example

Explanation of symbols

2 Outer surface

3 Inner surface

5 One side

6 The other side

7 Cut part

8 Convex

9 Convex

10 Convex

11 Convex

14 Separation surface

15 (circumferential) facing surface

16 Opposing surface (circumferential)

20 Cylindrical surface

21 Cylindrical surface

30 Cylindrical surface

31 Cylindrical surface

60 Clearance (on opposite surface)

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be exemplarily described in detail with reference to FIGS. 1 to 6 based on the embodiment. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are intended to limit the scope of the present invention only to those unless otherwise specified. is not.

[0031] [Structure of seal ring]

The shape of the seal ring according to the present embodiment will be described with reference to FIG. FIG. 1 (a) shows a schematic configuration of the cut portion 7 of the seal ring according to the present embodiment. As a material for the seal ring according to the present embodiment, synthetic resin materials such as PTFE, PEEK, and PPS are used. In the present embodiment, for example, the seal ring is formed by compression molding when PTFE is used, or by injection molding when PEEK or PPS is used.

[0032] As shown in FIG. 1 (a), the seal ring according to the present embodiment has a cut portion 7 in a part thereof, and in the cut portion 7, one end 40 of the seal ring and the other end The end 50 is unevenly fitted.

[0033] First, the shape of one end 40 of the seal ring (FIG. 1 (a) right end) will be described.

The end portion 40 has an outer peripheral surface 2, an inner peripheral surface 3, an outer peripheral surface 2, and side surfaces 5 and 6 connected to the peripheral edge of the inner peripheral surface 3. Further, a separation surface 14 that is connected to the outer peripheral surface 2 and the inner peripheral surface 3 and divides the end portion 40 into two in the axial direction is provided in the approximate middle of both side surfaces. The separation surface 14 is a plane provided perpendicular to the axis, and separates the end 40 into the front side and the back side in FIG. 1 (a).

[0035] One of the end portions 40 divided in the axial direction by the separation surface 14 (Fig. 1 (a) back side) has an outer peripheral surface 2, an inner peripheral surface 3, a side surface 6, a separation surface 14, A step shape is formed by the facing surface 15, the facing surface 16, and the cylindrical surface 20.

Specifically, first, the facing surface 15 is provided so as to extend radially inward from the circumferential edge force of the outer circumferential surface 2. The facing surface 15 is substantially the same as the circumferential direction of the seal ring, and faces the facing surface 15 'of the other end portion 50 of the seal ring in a state where both ends of the seal ring are unevenly fitted. Surface.

[0037] Then, from the radially inner end edge of the opposed surface 15 to the circumferential direction of the seal ring (the other end portion 50). The cylindrical surface 20 is provided so as to extend in the direction of The cylindrical surface 20 is provided concentrically with the outer peripheral surface 2 and the inner peripheral surface 3.

[0038] The facing surface 16 is provided so as to extend from the circumferential edge of the cylindrical surface 20 to the circumferential edge of the inner circumferential surface 3. The facing surface 16 is the same as the facing surface 15 described above, and the normal direction of the facing surface 16 is substantially the same as the circumferential direction of the seal ring, and the other end of the seal ring is in a state in which both ends of the seal ring are fitted to be uneven. This is the surface facing the facing surface 16 ′ of the part.

[0039] By connecting the outer peripheral surface 2, the opposing surface 15, the cylindrical surface 20, the opposing surface 16, and the inner peripheral surface 3 in this manner, one end 40 of the seal ring is connected to the inner periphery of the seal ring. A stepped shape with a convex side is provided. Further, this step shape is provided at two locations that are shifted in the circumferential direction with the separation surface 14 as a boundary.

[0040] That is, the opposite surface provided so as to extend radially inward from the circumferential edge of the outer peripheral surface 2 to the other of the two divided by the separation surface 14 (the front side in FIG. 1 (a)) 17, a cylindrical surface 30 provided so as to extend from the radially inner end of the facing surface 17 in the circumferential direction of the seal ring (the direction of the other end), and the circumferential edge of the cylindrical surface 30 A stepped shape similar to that described above is formed by the opposing surface 18 provided so as to extend to the circumferential edge of the inner peripheral surface 3.

[0041] The facing surface 17 and the facing surface 18 are surfaces facing the facing surfaces 17 'and 18' of the other end 50 of the seal ring, and the cylindrical surface 30 is the outer peripheral surface 2 and the inner peripheral surface 3 respectively. It is provided concentrically.

Next, the shape of the other end 50 (the left end in FIG. 1 (a)) of the seal ring will be described. The shape of the other end portion 50 of the seal ring has a shape that can be unevenly fitted to the one end portion 40 of the seal ring.

That is, the separation surface 14 is also provided at the other end portion 50, and a step shape is provided by being shifted in the circumferential direction of the seal ring with the separation surface 14 as a boundary. Note that, at one end 40, the force with which the convex portions 9, 10 are formed on the inner peripheral surface side of the seal ring, and at the other end portion 50, the convex portions 8, 11 are formed on the outer peripheral surface side of the seal ring. .

[0044] Further, the other end 50 has circumferential facing surfaces 15 ', 16', 17 ', 18 facing the facing surfaces 15, 16, 17, 18 provided on the one end 40, respectively. ', And outer peripheral surface 2, inner peripheral surface 3 Concentric cylindrical surfaces 21, 31 are provided.

As described above, by configuring the one end portion 40 and the other end portion 50 of the seal ring in such a configuration, in a state where these both end portions are fitted in the cut portion 7, each separation surface 14 However, the cylindrical surfaces 20 and 30 of the one end 40 can contact the cylindrical surfaces 21 and 31 of the other end 50 without generating a gap.

[0046] FIG. 1 (b) shows a schematic configuration in a state where the end portions 40 and 50 of the seal ring are engaged with each other. The hatched portion in FIG. 1 (b) indicates a region provided on the end portions 40 and 50 where the cylindrical surfaces and the separation surface 14 come into contact with each other.

[0047] As shown in FIG. 1 (b), in the seal ring according to the present embodiment, two step shapes provided to be shifted in the circumferential direction are fitted to the respective end portions 40, 50. Thus, the separation surfaces 14, the cylindrical surfaces 20 and 21, and the cylindrical surfaces 30 and 31 are in contact with each other without generating a gap.

Yes

[0048] On the other hand, a gap 60 is formed between the circumferential facing surfaces provided at the respective end portions. This is due to the following reason. That is, the seal ring formed of a synthetic resin material as in the present embodiment is likely to undergo thermal deformation such as thermal expansion and thermal contraction.

[0049] By forming the gap 60 in the circumferential direction of the seal ring, the size of the gap 60 is maintained while maintaining the sealed state even if the seal ring expands and contracts due to heat. The amount of change can be absorbed. Therefore, the seal ring having this special step cut can maintain the sealing performance even when the circumferential length of the seal ring changes due to a change in ambient temperature.

[0050] That is, the gap 60 provided between the opposing surfaces of the seal ring according to the present embodiment is formed to allow a change in the circumferential length of the seal ring.

[0051] Also, as shown in FIG. 1 (b), according to the seal ring according to the present embodiment, even if the gap 60 is provided between the opposing surfaces at both ends of the seal ring forming the cut portion 7, The cross-section of the seal ring concentric with the shaft and the cross-section of the seal ring perpendicular to the shaft are continuous in the circumferential direction of the seal ring. This point will be described below.

FIG. 2 shows a cross section of the seal ring concentric with the shaft (X—Y cross section in FIG. 2). Fig. 2 (b) is a cross-sectional view through 8'18 'in Fig. 2 (&), and Fig. 2 (c) is 8-^ in Fig. 2 (&). Fig. 2 (d) shows the XY cross-section passing through CC 'in Fig. 2 (a).

[0053] As shown in Figs. 2 (b) to (d), the cross-section of the seal ring concentric with the shaft (X-Y cross-section in Fig. 2) is the circumferential direction of the seal ring (X-axis direction). This is a continuous structure.

[0054] Fig. 3 shows a cross section of the seal ring perpendicular to the axis (X-Z cross section in Fig. 3). Fig. 3 (b) shows a cross-section through -8 'in Fig. 3 (&). Fig. 3 (c) shows an X-Z cross-section through B-B' in Fig. 3 (a). Fig. 3 (d) shows the X-Z cross section through C- in Fig. 3 (a).

[0055] As shown in Figs. 3 (b) to 3 (d), the cross section of the seal ring perpendicular to the axis (X-Z cross section in Fig. 3) is all in the circumferential direction of the seal ring (X axis direction). This is a continuous configuration.

[0056] That is, the seal ring which is the force of this embodiment has a configuration in which the cross section of the seal ring concentric with the shaft and the cross section of the seal ring perpendicular to the shaft are continuous in the circumferential direction of the seal ring. Have.

[0057] Thus, according to this configuration, there is no gap between the sealed fluid side and the non-sealed fluid side, so that the annular gap between the housing and the shaft can be reliably sealed.

[0058] [Installation method of seal ring]

A method for attaching the seal ring according to the present embodiment will be described with reference to FIGS. FIG. 4 is a view showing a mounting method in the cut portion 7 of the seal ring according to the present embodiment, and FIG. 5 is an overall view of the seal ring according to the present embodiment.

As shown in FIG. 4, when the seal ring according to the present embodiment is mounted, the cylindrical surface 20 provided on one end 40 and the cylindrical surface 30 are provided on the other end 50, respectively. The two end portions may be fitted to each other so as to contact the cylindrical surface 21 and the cylindrical surface 31.

[0060] According to the seal ring according to the present embodiment, it is possible to move the end of the seal ring in the radial direction in the cut portion 7.

That is, as shown in FIG. 5, according to the seal ring according to the present embodiment, the seal ring is mounted by moving the end of the seal ring in the radial direction without moving in the circumferential direction. Therefore, the mounting property of the seal ring can be improved.

[0062] Further, since the seal ring according to the present embodiment is formed of a synthetic resin material, even if the end portion of the seal ring is once moved in the radial direction and the seal ring is deformed, Due to the elastic restoring force of the synthetic resin, the seal ring returns to its original annular shape when mounted, and the annular gap can be reliably sealed.

[0063] [When used as inner or outer seal]

With reference to FIG. 6, the configuration of the cut portion 7 when the seal ring according to the present embodiment is used as an inner peripheral seal and an outer peripheral seal will be described.

FIG. 6 (a) shows a case where the seal ring according to the present embodiment is mounted in an annular groove formed on the outer peripheral surface of the shaft, that is, the seal ring according to the present embodiment is used as an outer peripheral seal. A schematic configuration of the case is shown. FIG. 6 (b) shows a case where the seal ring according to the present embodiment is installed in an annular groove formed on the inner peripheral surface of the hooding, that is, the seal ring according to the present embodiment is mounted on the inner peripheral seal. The schematic structure when used as is shown.

[0065] As shown in FIGS. 6 (a) and 6 (b), even when the seal ring according to the present embodiment is used as an outer peripheral seal or an inner peripheral seal, it is concentric with the shaft. The cross section of the seal ring and the cross section of the seal ring perpendicular to the shaft are continuous in the circumferential direction of the seal ring, and no discontinuous portion is formed.

[0066] In other words, in the conventional seal ring configuration, since a discontinuous portion is formed on either the outer peripheral surface side or the inner peripheral surface side, the seal ring having the same structure is used as the inner peripheral seal. And it was difficult to apply as a peripheral seal (see Fig. 7 (f)).

[0067] On the other hand, the seal ring according to the present embodiment has a configuration in which both the outer peripheral surface 2 and the inner peripheral surface 3 are continuous in the circumferential direction. That is, it is possible to apply a seal ring having the same structure to the inner seal and the outer seal. Therefore, it is not necessary to separate the manufacturing process of the inner peripheral seal and the outer peripheral seal. Therefore, the force S can be achieved to reduce the manufacturing cost of the seal ring.

[0068] As described above, according to the seal ring according to the present embodiment, the cut portion 7 is formed at one position of the seal ring, and there is a gap between the circumferentially opposed surfaces at both ends of the seal ring. In the formed seal ring, both the concentric and perpendicular to the shaft of the seal ring are continuous in the circumferential direction of the seal ring. Does not cause a gap to communicate. Therefore, it is possible to provide a seal ring that can be used for both inner and outer peripheral seals. Furthermore, according to the seal ring according to the present embodiment, since both end portions can be moved in the radial direction of the seal ring, it is possible to improve the mountability of the seal ring.

Claims

The scope of the claims

[1] A seal ring that is provided in an annular gap between two relatively moving members and seals the annular gap,

A cut portion is provided at one place in the circumferential direction of the seal ring, and opposed surfaces in the circumferential direction are formed at both ends of the seal ring forming the cut portion, and the circumferential length can be changed between the opposed surfaces. A gap is formed so that

Sino-Reling

An outer peripheral surface,

An inner peripheral surface,

Both side surfaces connecting the peripheral edge of the outer peripheral surface and the peripheral edge of the inner peripheral surface;

With

Regardless of the change in the circumference of the seal ring,

The structure is continuous over the circumferential direction of the seal ring at any position in the cross-section of the seal ring concentric with the shaft and in the radial direction of the seal ring.

In addition, the sealing ring is characterized in that the cross-sectional force of the seal ring perpendicular to the shaft is continuous in the circumferential direction of the seal ring at any position in the radial direction of the seal ring.

[2] At each end of the seal ring,

An outer peripheral surface,

An opposing surface extending radially inward from the circumferential edge of the outer peripheral surface;

A cylindrical surface substantially concentric with the shaft extending in the circumferential direction from the radially inner edge of the opposing surface, and from the circumferential edge of the cylindrical surface to the circumferential edge of the inner circumferential surface radially inward An opposite facing surface,

An inner peripheral surface,

And having a step shape formed by

The step shape is

It is connected to the inner peripheral surface and the outer peripheral surface, and is configured to be provided at two locations shifted in the circumferential direction of the seal ring, with a separation surface that bisects the end portion of the seal ring in the axial direction as a boundary, One end of the seal ring has a stepped shape with a convex inner peripheral surface side,

The other end of the seal ring has a stepped shape with a convex outer peripheral surface side,

In the state where both ends of the seal ring are fitted,

2. The seal ring according to claim 1, wherein a separation surface and a cylindrical surface provided at each end abut each other.