JP2006207820A - Sliding member and sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the further sliding resistance in a sliding member and a sealing device. <P>SOLUTION: The second oil room side slope 47 and the first oil room side slope 48 are formed on a surface 45 of a lip 42 of the sealing member 20 that is established in a piston member 14. Recesses or projections 50 as many undulations to incline on the second oil room side slope 47 for reverse alternatively to the circumference direction 49 of the lip are formed in a plurality of rows. The contact area between the second oil room side slope 47 and an outer circumference face 23 of an inner pipe 13a of a housing 13 is reduced. The working oil is stored to the surrounding of the recesses or the projections 50. The sliding resistance is reduced certainly by improving the lubrication condition between the lip 42 and the circumference face 23 prominently. The response of action of the piston member 14 is improved more. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sliding member and a sealing device.

Reducing the sliding resistance between two objects that slide on each other as much as possible is a very important problem for mechanical parts such as bearings and seals. This is because not only can the life of these mechanical parts be improved, but also energy loss can be suppressed.
Conventionally, the surface of the sliding portion is coated with a fluororesin, which is a low friction resin, but the manufacturing cost increases. In addition, a lubricant such as grease or lubricating oil is interposed between the two objects, but the lubricant may run out between the two objects, and there is a limit to reducing sliding resistance. .

By the way, generally in a sliding part comprised using a polymeric material, there exists a tendency for sliding resistance to become large. For example, a sealing device that seals between the rotating shaft and the housing or between the reciprocating shaft and the housing has a sliding portion made of a rubber material that slides on the rotating shaft and the reciprocating shaft.
The sliding resistance may increase due to the oil film running out of the sliding portion.
Among the above-described sealing devices, for example, a sealing device used for a clutch portion in an automatic transmission of an automobile typically has an annular rubber seal member provided on the inner periphery or outer periphery of the piston member. The surface is provided with a lip as a sliding portion that contacts the housing. Thereby, the space between the housing and the piston member is sealed.

Conventionally, since the entire sliding surface of the lip of the sealing member is in contact with the housing or the like, the sliding resistance is large. In addition, since the sealing members are provided on the outer periphery of the annular piston member, there is a problem that the response of the operation of the piston member is poor.
On the other hand, for the purpose of reducing sliding resistance, a sealing device has been proposed in which an annular protrusion or the like along the circumferential direction is provided on the sliding surface of the lip (see, for example, Patent Document 1), but the sliding resistance is not sufficiently reduced. .
Japanese Patent Laid-Open No. 9-210088

Then, the subject of this invention is reducing sliding resistance more in a sliding member and a sealing device.

In order to achieve the above object, a first aspect of the present invention provides a sliding member having a sliding portion that slides relative to a mating member, and is spaced from the surface of the sliding portion in the sliding direction. A row consisting of a number of undulations having a longitudinal direction and a short direction surrounded by the surface of the sliding portion that is arranged and slides relative to the mating member is spaced apart in a direction perpendicular to the sliding direction. A plurality of undulations are provided, including a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with a mating member. The strips are independent from the adjacent undulating strips by being surrounded by the surface of the sliding portion that slides relative to the mating member, and each row of the undulating strips has an extension line in the longitudinal direction thereof adjacent to the row. It is arranged to intersect with the longitudinal direction of the undulations There is provided a sliding member that.

In the present invention, since the lubricant stored in a large number of concave stripes or around a large number of convex stripes is abundantly supplied to the sliding portion with the relative sliding of the sliding member, the sliding resistance is remarkably increased. Can be reduced. Further, the contact area of the sliding surface is reduced, and the sliding resistance can be remarkably reduced.
According to a second aspect of the present invention, there is provided a sealing device including a sealing member for sealing between a mating member and the sealing member including a sliding portion in which the sealing member slides relative to the mating member. A row of undulating ridges having a longitudinal direction and a lateral direction surrounded by the surface of a sliding portion that is arranged on the surface at intervals in the sliding direction and that slides relative to the counterpart member is slid. A plurality of undulations are provided at intervals in a direction orthogonal to the moving direction, and the above-mentioned undulations can store hydraulic oil, or when the abutment with a mating member, can store hydraulic oil around it. Each undulation ridge is independent from the adjacent undulation ridge by being surrounded by the surface of the sliding portion that slides relative to the mating member. The longitudinal extension line intersects the longitudinal direction of the undulations in adjacent rows. That it is arranged to there is provided a sealing device according to claim.

In the present invention, the lubricant stored in a large number of concave stripes or around a large number of convex stripes is sufficiently supplied to the sliding portion along with the relative sliding of the sliding portion of the sealing device. Resistance can be greatly reduced. Further, the contact area of the sliding surface is reduced, and the sliding resistance can be remarkably reduced.
According to a third aspect of the present invention, there is provided a sealing device including a sealing member for sealing between a mating member and the sealing member including an annular sliding portion in which the sealing member rotates relative to the mating member. And a plurality of undulations having a longitudinal direction and a short direction surrounded by the surface of the sliding portion that is arranged in the circumferential direction of the sliding portion with a space therebetween and slides relative to the counterpart member. A plurality of rows are provided at an interval in the axial direction of the sliding portion, and the above-mentioned undulating strip is a concave strip that can store hydraulic fluid, or the hydraulic fluid can be stored around it when it comes into contact with a mating member. Each undulation ridge is independent of the adjacent undulation ridge by being surrounded by the surface of the sliding part that slides relative to the mating member. The strip has an extension in the longitudinal direction with respect to the longitudinal direction of the undulating strip in the adjacent row. There is provided a sealing device which is characterized in that it is arranged so as to intersect.

In the present invention, in the sealing device for the rotating shaft, the lubricant stored in the large number of concave stripes or around the large number of convex stripes is supplied to the sliding portion abundantly with the rotation of the rotary shaft. The rotational frictional resistance of the rotating shaft by the device can be greatly reduced. Further, the contact area of the sliding surface is reduced, and the sliding resistance can be remarkably reduced.
The invention according to claim 4 includes a sealing member for sealing between the mating member, and the sealing device includes an annular sliding portion in which the sealing member moves relative to the mating member in the axial direction.
A large number of longitudinal and short directions are arranged on the surface of the sliding part at intervals in the axial direction of the sliding part and surrounded by the surface of the sliding part that slides relative to the mating member. A row of undulations
A plurality of undulating strips are provided at intervals in the circumferential direction of the sliding portion, and the above-mentioned undulating strip is a recess that can store hydraulic fluid, or a recess that can store hydraulic fluid around it when it comes into contact with a mating member Each undulation ridge is independent from the adjacent undulation ridge by being surrounded by the surface of the sliding portion that slides relative to the mating member. The extension line in the longitudinal direction is arranged so as to intersect the longitudinal direction of the undulations of adjacent rows.

In the present invention, for example, in a sealing device for a reciprocating shaft, lubricant stored in a large number of concave stripes or around a large number of convex stripes is sufficiently supplied to the sliding portion along with the reciprocating motion of the reciprocating shaft. Therefore, the reciprocating frictional resistance of the reciprocating shaft by the sealing device can be significantly reduced. Further, the contact area of the sliding surface is reduced, and the sliding resistance can be remarkably reduced.
The invention according to claim 5 includes an annular piston member that divides the annular oil chamber in the annular cylinder chamber, and an annular seal member provided in the piston member, and the seal member corresponds to a corresponding circumference of the cylinder chamber. A lip as a sliding portion that slidably contacts the surface, and a plurality of independent undulations having a longitudinal direction and a short direction surrounded by the surface of the lip are formed on the surface of the lip of the seal member. A plurality of rows that are arranged in the circumferential direction at a predetermined circumferential pitch are arranged in the axial direction of the lip at a predetermined axial pitch, and the undulating strip is a concave strip that can store hydraulic oil, or a counterpart It includes a ridge that can form a recess in which hydraulic oil can be stored around the member when it comes into contact with the member. The longitudinal direction of the undulation is along the circumferential direction of the lip, and the short direction of the undulation is the lip. Along the axial direction of Providing a sealing device, characterized in that.

The invention according to claim 6 includes an annular piston member that divides an annular oil chamber in an annular cylinder chamber, and a pair of inner and outer annular seal members respectively provided on the piston member. Lip as a sliding portion that is slidably in contact with a corresponding peripheral surface of the chamber, and the lip surface of at least one seal member has a longitudinal direction and a short direction surrounded by the lip surface. A plurality of independent undulations are arranged in the circumferential direction of the lip at a predetermined circumferential pitch, and a plurality of rows are arranged in the axial direction of the lip at a predetermined axial pitch. Including a ridge that can be stored, or a ridge that can form a recess in which hydraulic oil can be stored around it when it comes into contact with the mating member, and the longitudinal direction of the undulation ridge is along the circumferential direction of the lip Moni, the lateral direction of the undulations strip is characterized in that along the axial direction of the lip.

According to the inventions of claims 5 and 6, in the seal member provided on the piston member, since the undulations are formed on the surface of the lip, the contact area of the sliding surface is reduced, and the sliding resistance is remarkably increased. Can be small. In addition, since the hydraulic oil is very likely to accumulate in the recesses as the undulations or around the projections as the undulations, the lubrication state of the sliding surface is greatly improved,
Sliding resistance can be reduced more reliably. As a result, the responsiveness of the operation of the piston member can be significantly improved.

The invention according to claim 7 is the invention according to claim 6, wherein an annular partition plate for partitioning an annular oil chamber for applying back pressure to the piston member, and an annular seal member provided on at least the outer periphery of the partition plate; The seal member further includes a lip as a sliding portion slidably contacting a corresponding peripheral surface of the piston member, and a longitudinal direction and a short direction surrounded by the surface of the lip on the surface of the lip A plurality of rows of second undulations that are independent of each other and arranged at a predetermined circumferential pitch in the circumferential direction of the lip, and are arranged in a plurality of rows arranged at a predetermined axial pitch in the axial direction of the lip. The undulation line 2 includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with the mating member. The longitudinal direction of the strip is the circumference of the lip Together along the direction, the lateral direction of the second undulating strip is characterized in that along the axial direction of the lip.

According to the present invention, the same effect as that attained by the 6th aspect can be attained. Moreover, by applying the same seal member as that of the sixth aspect to the partition plate of the oil chamber for the back pressure load, the sliding resistance received by the piston member can be further reduced.
The undulations in adjacent rows may be arranged alternately as described in claim 8.
The invention according to claim 9 includes an annular piston member that divides an annular oil chamber in an annular cylinder chamber, and an annular seal member provided in the piston member,
Including a lip as a sliding portion that is slidably in contact with a corresponding peripheral surface of the cylinder chamber, and having a longitudinal direction and a short direction surrounded by the surface of the lip on the surface of the lip of the seal member. A plurality of rows of undulations are arranged at a predetermined circumferential pitch in the circumferential direction of the lip so that the undulations are arranged at a predetermined axial pitch in the axial direction of the lip. The ridges adjacent to each other in the circumferential direction include a ridge that can form a recess that can store hydraulic oil around it when it abuts against a mating member. Provided is a sealing device characterized in that the undulating ridges inclined in opposite directions with respect to the circumferential direction are inclined in the same direction with respect to the circumferential direction of the lip.

The invention according to claim 10 includes an annular piston member that divides the annular oil chamber in the annular cylinder chamber, and an annular seal member provided in the piston member, and the seal member has a corresponding circumference of the cylinder chamber. Including a lip as a sliding portion that is slidably in contact with the surface, the lip surface of the seal member is surrounded by the surface of the lip and has a longitudinal direction and a lateral direction, the longitudinal direction being relative to the circumferential direction of the lip A plurality of inclined undulating ridges arranged in the circumferential direction of the lip are provided in a plurality of rows arranged in the lip axial direction, and the undulating ridges are concave ridges or mating members that can store hydraulic oil. Each row of undulations has a longitudinal extension line extending along the length of the adjacent row of undulations. To intersect the direction And it is characterized in that it is location.

The invention according to claim 11 includes an annular piston member that divides an annular oil chamber in an annular cylinder chamber, and a pair of inner and outer annular seal members respectively provided on the piston member,
Each seal member includes a lip as a sliding portion that is slidably in contact with a corresponding peripheral surface of the cylinder chamber, and the surface of the lip of at least one of the seal members is surrounded by the surface of the lip and is long and short. A plurality of independent undulations having a longitudinal direction inclined with respect to the circumferential direction of the lip and arranged in the circumferential direction of the lip. Includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with a mating member. The extension line in the longitudinal direction is arranged so as to intersect the longitudinal direction of the undulations in adjacent rows.

In each of the ninth, tenth and eleventh aspects, the same effect as that of the fifth aspect can be obtained. In addition, by using the undulations that are inclined with respect to the circumferential direction of the lip, the hydraulic oil is more easily collected on the sliding surface of the lip, and the sliding resistance can be reduced.
A twelfth aspect of the present invention is that, in the eleventh aspect, an annular partition plate for partitioning an annular oil chamber for applying a back pressure to the piston member, and an annular seal member provided on at least the outer periphery of the partition plate; The seal member further includes a lip as a sliding portion that slidably contacts a corresponding peripheral surface of the piston member, and the surface of the lip is surrounded by the surface of the lip and has a longitudinal direction and a short direction. A plurality of rows of second undulations that are independent of each other and whose longitudinal direction is inclined with respect to the circumferential direction of the lip are arranged in the circumferential direction of the lip. The two undulations include a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with a mating member. 2 undulations are in the longitudinal direction Extension is characterized in that it is arranged so as to intersect the longitudinal direction of the second undulating strip of adjacent columns.

In the present invention, an effect similar to that of the eleventh aspect can be obtained. In addition, by applying a seal member similar to the eleventh aspect to the partition plate of the oil chamber for the back pressure load, the sliding resistance received by the piston member can be further reduced.

Embodiments of the present invention will be specifically described below with reference to the drawings.
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram showing a schematic configuration of an automobile.
The automobile 1 includes, for example, a power source 2 such as an engine, an automatic transmission 4 communicated with the power source 2 via a torque converter 3, drive wheels 5 to which power from the automatic transmission 4 is transmitted, Wheel 6 is provided. The automatic transmission 4 decelerates the rotation of the power source 2 and transmits it to the drive wheels 5. The input shaft 7 of the automatic transmission 4 is connected to the power source 2 through the torque converter 3 so as to be able to transmit power, and the output shaft 8 is connected to the drive wheels 5 through the joint 9, the transmission shaft 10 and the like. It is connected so that it can be transmitted.

The automatic transmission 4 includes an input shaft 7, an output shaft 8, a speed change mechanism 11 that is interposed between the input shaft 7 and the output shaft 8, and a clutch portion 12 provided in the speed change mechanism 11. have. The power from the input shaft 7 to the speed change mechanism 11 can be transmitted or interrupted by the operation of the clutch portion 12.
FIG. 2 is an enlarged schematic cross-sectional view of a main part of the clutch portion 12 of the automatic transmission 4. Referring to FIG. 2, the clutch portion 12 has a housing 13, a piston member 14, and a partition plate 15.
And. The housing 13, the piston member 14, and the partition plate 15 each have an annular shape, and are arranged around the central axis 16 of the input shaft 7.

The housing 13 includes an inner cylinder 13 a formed in an annular shape around the central axis 16, and a central axis 16
An outer cylinder 13b formed in an annular shape radially outward of the inner cylinder 13a, and an annular end wall 13c connecting between the inner cylinder 13a and one end (the left end in FIG. 2) of the inner cylinder 13a It has. The housing 13 has a groove shape in cross section, and the cylinder chamber 17 is formed in an annular shape.
Further, the outer cylinder 13 b of the housing 13 includes a cylindrical portion 13 d concentric with the central axis 16 and the cylindrical portion 1.
And a tapered portion 13e extending outward in the radial direction as the distance from 3d increases in the axial direction.

The piston member 14 includes an inner cylinder 14a formed in an annular shape around the central axis 16 and the central axis 1
An annular end wall 14c that connects between the outer cylinder 14b formed annularly outwardly in the radial direction of the inner cylinder 14a and one end (the left end in FIG. 2) of the inner cylinder 14a and the outer cylinder 14b. With. The outer cylinder 14b of the piston member 14 includes a cylindrical portion 14d concentric with the central axis 16 and a cylindrical portion 14.
a taper portion 14e extending outward in the radial direction with increasing distance from the axis d, and a taper portion 14e.
And a pressing portion 18 extending radially outward. The inner cylinder 14 a of the piston member 14 is provided with an annular rubber seal member 20 on its inner peripheral surface 19. The piston member 14
The outer cylinder 14b is provided with an annular seal member 22 on the end wall 14c side of the outer peripheral surface 21 thereof. The center axis of each seal member 20, 22 is on the center axis 16.

The piston member 14 is inserted into the cylinder chamber 17 so as to be slidable in the axial direction. The seal member 20 is the outer peripheral surface 23 of the inner cylinder 13 a of the housing 13, and the seal member 22 is the housing 1
3 and the inner peripheral surface 24 of the outer cylinder 13b. Housing 13,
A first oil chamber 25 is defined in the cylinder chamber 17 by the piston member 14 and the seal members 20 and 22.

The inner cylinder 13 a of the housing 13 has a communication hole 26 communicating with the first oil chamber 25 and the radially inner path 101 of the inner cylinder 13 a of the housing 13. Thus, the hydraulic oil pressurized by a pressurizing device (not shown) can flow into the first oil chamber 25 (open arrow in FIG. 2).
The partition plate 15 is a member made of, for example, a sheet metal formed in an annular shape around the central axis 16. A flat portion 27 parallel to the end wall 14c of the piston member 14 is provided on the side surface of the partition plate 15 on the first oil chamber 25 side. An annular sealing member 29 is provided on the outer periphery 28 of the partition plate 15. The seal member 29 is disposed so as to contact the inner peripheral surface 30 of the outer cylinder 14 b of the piston member 14. A groove 31 is formed in the inner cylinder 13 a of the housing 13, and a retaining ring 32 is fitted in the groove 31. When the partition plate 15 abuts against the retaining ring 32, movement of the partition plate 15 in one axial direction (right side in FIG. 2) is restricted.

The end wall 14 c of the piston member 14 is provided with a flat portion 33 on the side surface facing the partition plate 15, and a holding member 34 is attached to the flat portion 33. An elastic member 35 such as a coil spring is attached to the holding member 34 in parallel with the central axis 16. The elastic member 35 always presses the piston member 14 and the partition plate 15 in the axial direction.
A second oil chamber 36 is defined in the cylinder chamber 17 by the partition plate 15, the seal member 29, the piston member 14, the seal member 20, and the inner cylinder 13 a of the housing 13. The first oil chamber 25 and the second oil chamber 36 are arranged side by side in the axial direction of the cylinder chamber 17. A communication hole 37 is formed in the inner cylinder 13 a of the housing 13 so as to communicate the second oil chamber 36 and the radially inner region 100 of the inner cylinder 13 a of the housing 13. The hydraulic oil stored in the region 100 can flow into the second oil chamber 36 (black arrows in FIG. 2).

In the cylinder chamber 17, the piston member 14 with the seal members 20 and 22 is accommodated, and the partition plate 15 with the seal member 29 is accommodated to constitute the sealing device of the present embodiment. The seal members 20, 22, and 29 mainly function as a seal for linear reciprocation of the piston member 14, but the piston member 14 also rotates relative to the housing 13 and the partition plate 15, and thus functions as a seal for rotation. .

In the present embodiment, pressurized hydraulic oil flows into the first oil chamber 25 through the communication hole 26, and the piston member 14 is moved toward the second oil chamber 36 against the urging force of the elastic member 35. Slide. Thereby, as shown in FIG. 3, the pressing portion 18 of the piston member 14 has a plurality of first and second clutch plates 38a and 38b arranged in parallel with the pressing portion 18 (in general terms, simply the clutch (Also referred to as plate 38). As a result, the clutch plates 38 a and 38 b are pressed against each other, and the power from the input shaft 7 in FIG. 1 can be transmitted to the transmission mechanism 11 via the clutch portion 12.

The clutch portion 12 is a so-called single-effect type cylinder, and pressurized hydraulic oil is supplied only to the first oil chamber 25. When the piston member 14 slides toward the second oil chamber 36 by the hydraulic pressure of the supplied hydraulic oil, the elastic member 35 is compressed in the axial direction.
Here, when the hydraulic pressure of the hydraulic oil in the first oil chamber 25 is reduced, the force that presses the piston member 14 toward the second oil chamber 36 decreases, and the piston member 14 is urged by the urging force of the elastic member 35. Is pushed back to the first oil chamber 25 side. As a result, the pressing portion 18 of the piston member 14 releases the pressing to the clutch plate 38 shown in FIG. 3, and the transmission of power via the clutch portion 12 is interrupted.

Referring to FIG. 3, the housing 13 is attached to the input shaft 7 so as to be integrally rotatable.
When the housing 13 rotates together with the rotation of the input shaft 7, the hydraulic oil in the cylinder chamber 17 receives a centrifugal force proportional to the square of the rotational speed of the input shaft 7, and so-called centrifugal hydraulic pressure is generated. Specifically, a centrifugal oil pressure 40 that urges the piston member 14 toward the second oil chamber 36 is generated in the first oil chamber 25, while the piston member 14 is present in the second oil chamber 36. Is generated toward the first oil chamber 25, and the centrifugal hydraulic pressure 40 and the centrifugal hydraulic pressure (back pressure) 41 cancel each other. Therefore, the influence of the centrifugal hydraulic pressure generated in the clutch portion 12 due to the rotation of the housing 13 can be minimized, and the influence of the centrifugal hydraulic pressure on the operation of the piston member 14 can be minimized.

Next, each of the seal members 20, 22, and 29 will be described in detail. First, referring to FIG. 4, the seal member 20 on the inner cylinder 14 a side of the piston member 14 is connected to the inner cylinder 13 a of the housing 13.
An inner peripheral portion 43 that forms a radially inward lip 42 as a sliding portion that contacts the outer peripheral surface 23
And an outer peripheral portion 44 attached to the inner peripheral surface 19 of the inner cylinder 14a of the piston member 14.

The surface 45 of the inner peripheral portion 43 of the seal member 20 has a second oil chamber side inclined surface 47 and a first oil chamber side inclined surface 48 on both sides of the tip edge 46 of the lip 42. . The second oil chamber side inclined surface 47 is formed with a plurality of independent undulations 50 extending in the circumferential direction 49 of the lip 42 as a plurality of rows 52, 53, 54. ing. Adjacent columns 52, 5
The three, 54 concave stripes 50 are arranged alternately.

Referring to FIG. 5, the seal member 22 on the outer cylinder 14 b side of the piston member 14 is a radially outward lip 55 as a sliding portion that contacts the inner peripheral surface 24 of the outer cylinder 13 b of the housing 13.
It has.
The surface 56 of the lip 55 has a second oil chamber side inclined surface 58 and a first oil chamber side inclined surface 59 on both sides of the front edge 57 of the lip 55. The second oil chamber side inclined surface 58 is provided with a recess 50 in the same manner as the seal member 20. In other words, a plurality of independent undulations 50 extending along the circumferential direction 60 of the lip 55 are formed into a plurality of rows 52, 53, 5.
4 is formed. The recesses 50 in the adjacent rows 52, 53, 54 are arranged alternately.

As shown in FIG. 6, the seal member 29 provided on the outer periphery 28 of the partition plate 15 has the same configuration as the seal member 22. That is, the seal member 29 is the outer cylinder 1 of the piston member 14.
4b is provided with a radially outward lip 55 as a sliding portion contacting the inner peripheral surface 30 of 4b. A concave strip 50 having the same configuration as that of the seal member 22 is provided on the lip 55 with rows 52, 53, 54. It is formed without.

According to the present embodiment, the annular piston member 14 accommodated in the annular cylinder chamber 17.
On the second oil chamber side inclined surfaces 47 and 58 of the lips 42 and 55 as the sliding portions of the inner and outer seal members 20 and 22, a plurality of concave strips 50 form a plurality of rows 52, 53 and 54, respectively. Is formed. For this reason, the sliding contact area of each lip | rip 42 and 55 is reduced, and sliding resistance can be made remarkably small.

In addition, a large amount of hydraulic oil can be held on the second oil chamber side inclined surfaces 47 and 58 by the large number of concave strips 50, thereby reducing the sliding resistance of the lips 42 and 55 more reliably. be able to. Therefore, it is possible to further improve the responsiveness of the operation of the piston member 14.
In addition, a similar recess 50 is provided on the seal member 29 that is in sliding contact with the inner peripheral surface 30 of the outer cylinder 14b of the piston member 14, and the sliding resistance between the seal member 29 and the piston member 14 is also reduced. It is possible to further improve the responsiveness of the operation of the piston member 14.

The depth of the recess 50 is preferably in the range of 20 to 100 μm. If the depth of the recess 50 is less than 20 μm, a sufficient lubrication effect cannot be obtained, and if it exceeds 100 μm, there is a risk of problems in the workability of the recess 50 and the strength of the lip 42. The above range was set. In addition, it is more preferable if the depth of the groove 50 is in the range of 40 to 80 μm.
The length A in the longitudinal direction of the recess 50 is preferably in the range of 100 to 500 μm. If the length A in the longitudinal direction of the recess 50 is less than 100 μm, a sufficient lubrication effect cannot be obtained. If the length A exceeds 500 μm, problems such as deterioration of sealing performance and generation of abnormal noise are likely to occur. The length A was set in the above range. In addition, the length A in the longitudinal direction of the groove 50 is 200 to 400 μm.
If it is the range, it is more preferable.

The width B in the short direction of the concave stripe 50 is preferably in the range of 50 to 200 μm. Concave 50
If the width B in the short direction is less than 50 μm, a sufficient lubrication effect cannot be obtained, and if it exceeds 200 μm, the number of the grooves 50 provided on the second oil chamber side inclined surface 47 of the lip 42 is reduced, and the sealing performance Therefore, the width B in the short direction of the recess 50 is set in the above range. In addition, it is more preferable if the width B in the short direction of the concave strip 50 is in the range of 80 to 150 μm.

The adjacent grooves 50 in the same row are preferably arranged such that the pitch C in the circumferential direction 49 is 1.5 to 3 times the length A of the grooves 50. The pitch C in the circumferential direction 49 is concave 5
If the length A is less than 1.5 times the length A (C <1.5A), the sealing performance may be deteriorated, and if it exceeds 3 times (C> 3A), a sufficient lubricating effect cannot be obtained. Was set in the above range.
If the pitch C in the circumferential direction 49 is in the range of 1.8 to 2.2 times the length A of the recess 50,
More preferred.

The axial pitch D of the rows 52, 53, 54 is preferably arranged in a range of 1.5 to 3 times the width B of the recess 50. The axial pitch D is less than 1.5 times the width B of the recess 50 (D
In <1.5 A), there is a possibility that the sealing performance is deteriorated, and when it exceeds 3 times (D> 3 A), a sufficient lubrication effect cannot be obtained. Therefore, the pitch D is set in the above range. In addition, it is more preferable if the pitch D in the axial direction is approximately twice the width B of the recess 50.

In the above-described embodiment, the concave line 50 which is a characteristic part is applied to the seal members 20 and 22 for the piston member 14, but also by applying the concave line 50 to one of the seal members 20 and 22. The effect of reducing sliding resistance can be obtained. In the above embodiment, the partition plate 15
Although the concave strip 50 is applied to the sealing member 29 for the purpose, there may be a case where the concave strip 50 is not applied.
For example, as shown in FIG. 7, the recess 50 has a predetermined inclination with respect to the circumferential direction 49 (an axis along the circumferential direction 49) of the sealing member 20. It may have an angle E. In this case, it is preferable that the adjacent grooves 50 in the same row are inclined in opposite directions (that is, in a C-shaped pattern). Although not shown in the drawings, the circumferential direction 60 (axis line along the circumferential direction 60) is also applied to the recess 50 of the seal members 22 and 29.
May have a predetermined inclination angle E. The inclination angle E is preferably in the range of 25 to 65 degrees, and more preferably in the range of 40 to 50 degrees.

Further, the undulating ridge is not limited to the concave 50 but may be formed by a convex. In this case, the height of the ridge is preferably in the range of 20 to 100 μm from the viewpoint of achieving high sealing performance and low slidability, and more preferably in the range of 40 to 80 μm. Even when the undulations are formed by ridges, the same effects as in the case of the ridges 50 can be achieved. That is, the sliding area of the lips 42 and 55 is reduced. Further, since hydraulic oil is very easily stored around the ridges, the sliding resistance of the lips 42 and 55 can be significantly reduced.

In the above embodiment, the undulations are formed on the second oil chamber side inclined surface.
However, the present invention is not limited to this, and undulations may be formed on the first oil chamber-side inclined surface, and undulations may be provided on both the first oil chamber-side inclined surface and the second oil chamber-side inclined surface. It may be formed.
Furthermore, the shape of the ridges / ridges may be, for example, a quadrangle, an ellipse, or a rhombus.
In the above embodiment, the sealing device of the present invention has been described in accordance with an example in which the sealing device of the present invention is applied as a sealing device for a piston member. However, the present invention is not limited to this.

For example, as shown in FIG. 8, a concave or convex strip 50 (see FIG. 5) is formed on the sliding portion 83 such as the lip of the sealing device 82 for the input shaft 81 of the electric power steering device 80. 7) to reduce rotational sliding resistance. In FIG. 8, a sealing device 82 seals between the housing 84 and the input shaft 81 of the electric power steering device 80, and includes a seal body 85 made of an elastic member and having the sliding portion 83, and a seal body 85. And a reinforcing cored bar 86 to be embedded. Reference numeral 87 denotes a backup ring.

Further, the sealing device 82 having the same configuration can be applied as an oil seal for the input shaft 89 and the output shaft 90 of the hydraulic power steering device 88 as shown in FIG.
In addition, the sliding portion such as a lip of a rod seal for a rack bar of a steering device may be provided with a concave or convex line having the above-mentioned C-shaped pattern to reduce the sliding resistance of linear reciprocation. it can.

Further, the rod seal for the reciprocating rod of the shock absorber used for the suspension can be provided with the concave or convex strips having the above-mentioned C-shaped pattern to reduce the sliding resistance of the linear reciprocating motion.
Moreover, the sliding resistance of the linear reciprocating motion can be reduced by providing the above-mentioned concave or convex strips having a C-shaped pattern on the sliding portion such as the lip of the rod seal for the valve stem of the engine. .

Further, in a bearing seal having a sliding portion such as a lip that is fixed to one of the inner ring and the outer ring of the bearing and that is in sliding contact with the other, a concave or convex shape that forms the above-mentioned C-shaped pattern on the sliding portion. A strip can be provided to reduce the sliding resistance of the bearing. The same applies to the seal for the pack bearing.
Moreover, the sliding resistance such as the reciprocating motion can be reduced by providing the groove or the ridge having the above-mentioned C-shaped pattern on the sliding portion such as the lip of the oil seal for the crankshaft of the engine.

Further, the present invention is not limited to application to oil seals or other sealing devices, and as shown in FIG. 10, a sliding member 91 made of a polymer material such as synthetic rubber or synthetic resin such as nylon 66 is used. Can be applied. In other words, the sliding portion 92 of the sliding member 91 is provided with the concave strip 50 or the convex strip that forms the above-mentioned C-shaped pattern inclined at an angle E in the opposite direction to the sliding direction 93, The sliding resistance is reduced.

Example 1 in which concaves forming a cross-shaped pattern similar to FIG. 7 were formed on the oil-side inclined surface of the inward lip of the oil seal for the rotating shaft, and the oil-side inclined surface similar to FIG. Example 2 in which concave stripes extending in the direction were formed and Comparative Example 1 in which no irregularities were formed were prepared and the rotational friction torque was measured. The result shown in FIG. 11 was obtained.
Referring to FIG. 11, when looking at the starting rotational friction torque and the stable rotational friction torque (after 10 hours),
Starting rotational friction torque comparative example 1: 1.6 kgf · cm (15.7 N · cm)
Example 1: 0.9 kgf · cm (8.8 N · cm)
Example 2: 1.3 kgf · cm (12.7 N · cm)
Stable rotational friction torque comparison example 1: 1.4 kgf · cm (13.7 N · cm)
Example 1: 0.9 kgf · cm (8.8 N · cm)
Example 2: 1.1 kgf · cm (10.8 N · cm)
In Example 1, compared with Comparative Example 1 (conventional product), the starting rotational friction torque can be reduced by 43%, and the stable rotational friction torque can be reduced by 35%, while Example 2 is comparative example 1 (conventional product). In contrast, the starting rotational friction torque can be reduced by 20%, and the stable rotational friction torque can be reduced by 20%. That is, it has been found that a remarkable effect can be obtained that both the starting rotational friction torque and the stable rotational friction torque can be reduced. In particular, with respect to the first embodiment, the starting rotational friction torque has a value equal to the stable rotational friction torque, and thus has ideal friction characteristics.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims of the present invention.

It is a schematic diagram which shows schematic structure of a motor vehicle. It is the typical sectional view which expanded the principal part of the clutch part of an automatic transmission. It is a schematic diagram of a cylinder and a piston for explaining centrifugal oil pressure. It is a principal part expanded sectional view of the sealing member provided in the inner cylinder of the piston member of FIG. It is a principal part expanded sectional view of the sealing member provided in the inner cylinder of the piston member of FIG. It is a principal part expanded sectional view of the sealing member provided in the outer periphery of the partition board of FIG. It is a principal part expanded sectional view of the sealing member of another embodiment of this invention. It is the fragmentary sectional schematic diagram of the electric power steering device with which the sealing device of another embodiment of this invention was applied. It is a partial section schematic diagram of the hydraulic power steering device to which the sealing device of another embodiment of the present invention was applied. It is the schematic of the sliding member as another embodiment of this invention. It is a graph which shows a time-dependent change of rotational friction torque.

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 ... Automatic transmission, 12 ... Clutch part, 13 ... Housing, 13a ... Inner cylinder, 13b ... Outer cylinder, 14 ... Piston member, 14a ... Inner cylinder, 14b ... Outer cylinder, 15 ... Partition plate, 16 ... Central axis,
DESCRIPTION OF SYMBOLS 17 ... Cylinder chamber, 20 ... Seal member, 21 ... Outer peripheral surface, 22 ... Seal member, 23 ... Outer peripheral surface, 24 ... Inner peripheral surface, 25 ... First oil chamber, 28 ... Outer periphery, 29 ... Seal member, 30 ... Inner peripheral surface, 3
6 ... 2nd oil chamber, 42 ... Lip (sliding part), 45 ... Surface, 47 ... 2nd oil chamber side inclined surface, 4
DESCRIPTION OF SYMBOLS 9 ... Circumferential direction, 50 ... Recess, 52, 53, 54 ... Row, 55 ... Lip (sliding part), 56 ... Surface, 58 ... Second oil chamber side inclined surface, 60 ... Circumferential direction, E ... Inclination Angle, 91 ... sliding member, 92 ... sliding part, 93 ... sliding direction

Claims (12)

In the sliding member having a sliding portion that slides relative to the counterpart member,
From a number of undulations having a longitudinal direction and a short direction surrounded by the surface of the sliding part that is arranged on the surface of the sliding part at an interval in the sliding direction and that slides relative to the mating member. A plurality of rows are provided at intervals in a direction orthogonal to the sliding direction,
The undulation ridge includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with the mating member,
Each undulation is independent from the adjacent undulation by being surrounded by the surface of the sliding part that slides relative to the mating member,
A sliding member, wherein the undulations in each row are arranged such that the extension line in the longitudinal direction intersects the longitudinal direction of the undulations in adjacent rows. In a sealing device including a sealing member for sealing between a mating member and a sliding portion in which the sealing member slides relative to the mating member;
From a number of undulations having a longitudinal direction and a short direction surrounded by the surface of the sliding part that is arranged on the surface of the sliding part at an interval in the sliding direction and that slides relative to the mating member. A plurality of rows are provided at intervals in a direction orthogonal to the sliding direction,
The undulation ridge includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with the mating member,
Each undulation is independent from the adjacent undulation by being surrounded by the surface of the sliding part that slides relative to the mating member,
The sealing device according to claim 1, wherein the undulations in each row are arranged such that an extension line in the longitudinal direction intersects the longitudinal direction of the undulations in adjacent rows. In a sealing device including a sealing member for sealing between a mating member and an annular sliding portion in which the sealing member rotates relative to the mating member,
A large number of longitudinal and lateral directions are arranged on the surface of the sliding part at intervals in the circumferential direction of the sliding part and surrounded by the surface of the sliding part that slides relative to the mating member. A plurality of rows of undulations are provided at intervals in the axial direction of the sliding part,
The undulation ridge includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with the mating member,
Each undulation is independent from the adjacent undulation by being surrounded by the surface of the sliding part that slides relative to the mating member,
The sealing device according to claim 1, wherein the undulations in each row are arranged such that an extension line in the longitudinal direction intersects the longitudinal direction of the undulations in adjacent rows. In a sealing device including a sealing member for sealing between a mating member and an annular sliding portion in which the sealing member moves relative to the mating member in the axial direction.
A large number of longitudinal and short directions are arranged on the surface of the sliding part at intervals in the axial direction of the sliding part and surrounded by the surface of the sliding part that slides relative to the mating member. A plurality of rows of undulations are provided at intervals in the circumferential direction of the sliding part,
The undulation ridge includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with the mating member,
Each undulation is independent from the adjacent undulation by being surrounded by the surface of the sliding part that slides relative to the mating member,
The sealing device according to claim 1, wherein the undulations in each row are arranged such that an extension line in the longitudinal direction intersects the longitudinal direction of the undulations in adjacent rows. An annular piston member that divides an annular oil chamber in an annular cylinder chamber, and an annular seal member provided in the piston member;
The seal member includes a lip as a sliding portion that slidably contacts a corresponding peripheral surface of the cylinder chamber,
A row in which a plurality of independent undulations having a longitudinal direction and a lateral direction surrounded by the surface of the lip are arranged on the surface of the lip of the seal member at a predetermined circumferential pitch in the circumferential direction of the lip Are arranged at a predetermined axial pitch in the axial direction of the lip,
The undulation ridge includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with the mating member,
A sealing device characterized in that the longitudinal direction of the undulation ridge is along the circumferential direction of the lip and the short direction of the undulation ridge is along the axial direction of the lip. An annular piston member that divides an annular oil chamber in an annular cylinder chamber, and a pair of inner and outer annular seal members respectively provided on the piston member;
Each seal member includes a lip as a sliding portion that slidably contacts a corresponding peripheral surface of the cylinder chamber,
A plurality of independent undulations having a longitudinal direction and a short direction surrounded by the surface of the lip are arranged on the surface of the lip of at least one seal member and arranged at a predetermined circumferential pitch in the circumferential direction of the lip. A plurality of arranged rows are arranged in the axial direction of the lip at a predetermined axial pitch,
The undulation ridge includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with the mating member,
A sealing device characterized in that the longitudinal direction of the undulation ridge is along the circumferential direction of the lip and the short direction of the undulation ridge is along the axial direction of the lip. In Claim 6, further comprising an annular partition plate that partitions an annular oil chamber for applying a back pressure to the piston member, and an annular seal member provided at least on the outer periphery of the partition plate,
The seal member includes a lip as a sliding portion that slidably contacts the corresponding peripheral surface of the piston member,
On the surface of the lip, a large number of independent second undulations having a longitudinal direction and a short direction surrounded by the surface of the lip are arranged at a predetermined circumferential pitch in the circumferential direction of the lip. A plurality of rows are arranged side by side with a predetermined axial pitch in the axial direction of the lip,
The second undulation ridge includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with the mating member,
The sealing device characterized in that the longitudinal direction of the second undulation ridge is along the circumferential direction of the lip, and the short direction of the second undulation ridge is along the axial direction of the lip. 8. The sealing device according to claim 6, wherein the undulations in adjacent rows are arranged alternately. An annular piston member that divides an annular oil chamber in an annular cylinder chamber, and an annular seal member provided in the piston member;
The seal member includes a lip as a sliding portion that slidably contacts a corresponding peripheral surface of the cylinder chamber,
A row in which a plurality of independent undulations having a longitudinal direction and a lateral direction surrounded by the surface of the lip are arranged on the surface of the lip of the seal member at a predetermined circumferential pitch in the circumferential direction of the lip A plurality of undulations are arranged at a predetermined axial pitch in the axial direction of the lip,
The undulation ridge includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with the mating member,
The undulations adjacent in the circumferential direction are inclined in opposite directions with respect to the circumferential direction of the lip, and the undulations adjacent in the axial direction are inclined in the same direction with respect to the circumferential direction of the lip. Sealing device. An annular piston member that divides an annular oil chamber in an annular cylinder chamber, and an annular seal member provided in the piston member;
The seal member includes a lip as a sliding portion that slidably contacts a corresponding peripheral surface of the cylinder chamber,
On the surface of the lip of the seal member, a large number of independent undulations are arranged in the circumferential direction of the lip, which are surrounded by the lip surface and have a longitudinal direction and a lateral direction, the longitudinal direction being inclined with respect to the circumferential direction of the lip. A plurality of rows formed in the axial direction of the lip are provided,
The undulation ridge includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with the mating member,
The sealing device according to claim 1, wherein the undulations in each row are arranged such that an extension line in the longitudinal direction intersects the longitudinal direction of the undulations in adjacent rows. An annular piston member that divides an annular oil chamber in an annular cylinder chamber, and a pair of inner and outer annular seal members respectively provided on the piston member;
Each seal member includes a lip as a sliding portion that slidably contacts a corresponding peripheral surface of the cylinder chamber,
On the surface of the lip of at least one sealing member, a plurality of independent undulating strips surrounded by the surface of the lip and having a longitudinal direction and a lateral direction, the longitudinal direction being inclined with respect to the circumferential direction of the lip, A plurality of rows arranged side by side are arranged in the axial direction of the lip,
The undulation ridge includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with the mating member,
The sealing device according to claim 1, wherein the undulations in each row are arranged such that an extension line in the longitudinal direction intersects the longitudinal direction of the undulations in adjacent rows. In Claim 11, it further comprises an annular partition plate that partitions an annular oil chamber for applying a back pressure to the piston member, and an annular seal member provided at least on the outer periphery of the partition plate,
The seal member includes a lip as a sliding portion that slidably contacts the corresponding peripheral surface of the piston member,
On the surface of the lip, there are a number of independent second undulations in the circumferential direction of the lip that are surrounded by the surface of the lip and have a longitudinal direction and a lateral direction, and the longitudinal direction is inclined with respect to the circumferential direction of the lip. A plurality of rows formed side by side are arranged in the axial direction of the lip,
The second undulation ridge includes a ridge that can store hydraulic oil, or a ridge that can form a recess that can store hydraulic oil around it when it comes into contact with the mating member,
The second undulation ridge of each row is arranged so that the longitudinal extension line thereof intersects the longitudinal direction of the second undulation ridge of the adjacent row.

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