JP2019194397A - Bearing device - Google Patents

Abstract

To provide a bearing device which allows a sliding surface to slide with high sliding performance from a start of sliding.SOLUTION: An upper shoe 10 comprises: a synthetic resin slide bearing 34 that forms an upper shoe sliding surface 10a, being a second sliding surface, with a lower shoe sliding surface 20a in a bearing device 1 formed as being a wide sliding surface that is wider in an in-plane direction than the upper shoe sliding surface 10a formed with the second sliding surface; and a piston 33 that supports the slide bearing 34. A plurality of dimples 35 for holding a lubricant 50 are provided on a bottom surface 34a of the slide bearing 34. A substantially circular protrusion 40 for sealing that forms a substantially circular high pressure contact part 42 on the upper shoe sliding surface 10a at a confronted portion between the piston 33 and the slide bearing 34, and having a contact pressure higher than other parts with respect to the wide sliding surface, is provided. A dividing part 41 is formed to divide at least a part of the circumferential direction of the protrusion 40 for sealing formed to be substantially circular.SELECTED DRAWING: Figure 3

Description

  The support device relates to a support device that supports an upper structure such as a main girder in a lower structure such as a bridge pier in a bridge or the like.

  2. Description of the Related Art Conventionally, for example, there is a support device that is movable and supported in a building in which vibration or relative displacement occurs in, for example, a bridge, a base-isolated building, or a connection portion that connects fixed buildings. Such a supporting device is disposed between a supported structure such as a main girder and a supporting structure such as a bridge pier, and is fixed to the supporting structure and an upper arm fixed to the supported structure. By sliding the boundary surface with the lower collar, that is, the sliding surfaces, it can be supported so as to be displaceable in the in-plane direction at the boundary surface.

  In order to improve the sliding performance between the sliding surfaces which are the boundary surfaces, for example, in Patent Document 1, a synthetic resin made of a synthetic resin provided with a concave portion (dimple) for holding a lubricant on a synthetic resin sliding plate. A bearing device for sliding a sliding plate has been proposed.

  In addition, the bearing device proposed in Patent Document 1 provided with dimples on one sliding surface improves the sliding performance after the start of operation, but the sliding performance at the time of initial movement starting from the stopped state is reduced. It was found that the apparent coefficient of static friction increased.

JP 2001-132757 A

  Therefore, an object of the present invention is to provide a bearing device that allows sliding surfaces to slide with high sliding performance from the beginning of sliding.

  This bearing device has a first rod and a second rod disposed at respective opposing portions in the first building and the second building, and the sliding at the portions facing the first rod and the second rod. And a sliding device made of a synthetic resin having a second sliding surface that slides with the first sliding surface of the first rod, and the sliding device. A support member that supports the member, and the second sliding surface of the sliding member is provided with a plurality of holding portions that hold a lubricant, and an opposing portion between the sliding member and the supporting member is provided. A substantially annular convex portion that forms a substantially annular high-pressure contact portion on the second sliding surface, the contact pressure with respect to the first sliding surface being higher than other portions, and the convex portion formed in a substantially annular shape. A dividing portion for dividing at least a part of the annular direction is formed.

The above-described support device can slide the sliding surface with high sliding performance from the beginning of sliding.
More specifically, a substantially annular high-pressure contact formed by the convex portion is formed on the second sliding surface by providing a substantially annular convex portion at the facing portion between the sliding member and the support member. The part functions as a so-called dust seal, and can prevent dust, dust, or other dust from entering the sliding surface. Therefore, it is possible to prevent the sliding performance of the sliding surface from being lowered due to the intrusion of dust.

  In addition, since the plurality of holding portions for holding the lubricant are provided on the second sliding surface, the sliding performance between the sliding surfaces can be improved and retained by the lubricant held by the plurality of holding portions. Wear of the synthetic resin sliding member can be prevented by the lubricant held by the portion.

  Furthermore, since a dividing portion that divides at least a part of the annular direction in the substantially annular convex portion provided in the facing portion between the sliding member and the support member is formed, the sliding performance is reduced during the initial movement. Can be prevented.

  Specifically, the lubricant held by the holding portion is not supported on the sliding surface of the building supported by the support device in a state where leakage to the outside of the ring is restricted by a substantially annular high-pressure contact portion that prevents dust from entering. A load is applied, forming an adsorption state like a vacuum state, and an apparent static friction coefficient increases.

  On the other hand, even if a load acts on the lubricant by the dividing portion that divides at least a part of the substantially annular direction in the substantially annular convex portion provided in the facing portion between the sliding member and the support member. Since the lubricant can be released, the sliding surface can slide with high sliding performance from the initial movement without causing the above-described adsorption state.

  The first building and the second building in the above-described support device are, for example, a bridge having a pier as the first building and a main girder as the second building, a building as the first building, and a building. The connecting corridor that connects the building to the second building is the connecting passage, the pillar is the first building, the truss roof is the second building, or the building is the first building, and another building is It is good also as a building in the expansion structure used as the 2nd building.

The first fence and the second fence may be composed of a lower fence and an upper fence when the first building and the second building are arranged in the vertical direction.
The bearing device is a movable bearing, and may be an omnidirectional movable bearing that is movable in an in-plane direction on the sliding surface, or a unidirectional movable bearing that is movable in one direction in the in-plane direction.

  The in-plane direction is, for example, a direction parallel to the plane constituting the sliding surface when the sliding surface at the portion facing the first and second rods is a plane, and the direction intersecting the plane is It is a concept that does not include.

  The said convex part is a convex part which protrudes in the thickness direction of a sliding member, The convex part formed in the opposing part with the said sliding member in the said supporting member, The opposing part with the said supporting member in the said sliding member As a convex portion formed in a portion different from the convex portion formed in the above, the convex portion formed in the sliding member and the other member of the supporting member facing the other member, and the sliding member and the supporting member. Good.

In the in-plane direction, the substantially annular shape is not only a circumferential shape called an annular shape, but also any circumferential shape such as an elliptical circumferential shape, a substantially rectangular shape, or a substantially polygonal shape such as a substantially triangular shape. It becomes a round shape.
Further, the dividing direction of the convex portion by the dividing portion may be a substantially annular inner and outer direction, that is, a radial direction with respect to the substantially annular convex portion, or a direction intersecting the radial direction. May be.

  According to the present invention, it is possible to provide a support device capable of sliding a sliding surface with high sliding performance from the beginning of sliding.

The schematic sectional drawing of a support apparatus. The exploded perspective view of a sliding part. The bottom view of a sliding part. AA arrow expansion explanatory drawing of a support apparatus. The bottom view of the sliding part of another embodiment. The bottom view of the piston of another embodiment.

An embodiment of a support device will be described below with reference to the drawings.
1 is a schematic cross-sectional view of the bearing device 1, FIG. 2 is an exploded perspective view of the sliding portion 30, FIG. 3 is a bottom view of the slide bearing 34, and FIG. The AA arrow expansion explanatory drawing shown in FIG.

  Specifically, FIG. 3A shows a bottom view of the sliding portion 30 shown in a transparent state with the slide bearing 34, and FIG. 3B shows a sliding portion 30 showing the piston 33 invisible on the bottom side with a broken line. The bottom view of is shown. 4A shows a state in which the slide bearing 34 is separated downward from the piston 33 in the AA arrow enlarged view of part a in FIG. 1, and FIG. 4B is an AA arrow enlarged view of part a. FIG. 4 (c) corresponds to FIG. 4 (b) and shows the contact pressure p of the upper eyelid sliding surface 10a acting on the lower eyelid sliding surface 20a of the lower eyelid 20. FIG.

In FIG. 2, a part of the front side is notched for easy understanding of the shape of each element.
Further, in FIG. 4B, a space is provided between the upper rod sliding surface 10a and the lower rod sliding surface 20a, and the high pressure contact portion 42 corresponding to the sealing convex portion 40 is deformed so as to protrude downward. In practice, however, the thickness as shown is not formed.

  The bearing device 1 is a seismic isolation device that is disposed between an upper structure and a lower structure to form a seismic isolation structure. The upper device 10 is fixed to the upper structure, and is fixed to the lower structure. And a boundary surface between the upper rod 10 and the lower rod 20, that is, a surface at the boundary surface (sliding surface) by sliding the upper rod sliding surface 10a and the lower rod sliding surface 20a. The upper structure and the lower structure are supported so as to be displaceable in the inward direction (horizontal direction), and for example, vibration energy due to an earthquake, strong wind, or the like can be absorbed and the base can be isolated.

Specifically, as shown in FIG. 1, the support device 1 includes an upper rod 10 fixed to the bottom surface of the upper structure (not shown), and a lower rod 20 fixed to the upper surface of the lower structure (not shown). Is provided.
Specifically, the lower eyelid 20 includes a sole plate 21 fixed to the upper surface of the lower structure and a slide plate 22 attached to the sole plate 21. The upper surface of the slide plate 22 is formed with a lower rod sliding surface 20a that slides with an upper rod sliding surface 10a of the upper rod 10 described later. The slide plate 22 is, for example, a stainless plate whose surface is coated with a fluorine resin.

The upper rod 10 is composed of a steel beespot 11 fixed to the bottom surface of the upper structure, and a sliding portion 30 having a circular shape in plan view disposed in the mounting recess 11a at the center of the bottom surface of the baespot 11. Has been.
As shown in FIG. 2, the sliding portion 30 mounted in the mounting recess 11 a of the base pot 11 includes an elastic plate 31, a seal ring 32, a piston 33, and a slide bearing 34 in order from the top.

The elastic plate 31 is a rubber plate having a circular shape in plan view.
The seal ring 32 is a circular ring with a trapezoidal shape with a radially outer side being a vertical surface and an inner diameter being an inclined surface inclined downward toward the outer diameter. The outer diameter is the same as the elastic plate 31. ing.

  A shim, which is a thin fluororesin plate formed in a circular shape in plan view with the same diameter as the elastic plate 31, is provided between the elastic plate 31 and the seal ring 32 according to the specifications of the support device 1. Good

The piston 33 has a substantially cylindrical shape made of stainless steel, and a circular recess 33a that allows the seal ring 32 to be fitted is formed along the outer peripheral edge of the upper surface, and supports a slide bearing 34 described later.
The bottom surface 33b of the piston 33 is provided with a sealing convex portion 40 having a substantially circular shape as viewed from the bottom on the inner side of the outer surface of the bottom surface 33b with a predetermined interval.

  Further, as shown in the enlarged view of FIG. 2b, the sealing convex portion 40 projects from the bottom surface 33b of the piston 33 in the thickness direction of the sliding portion 30, that is, in the height direction (downward direction) of the sliding portion 30. Therefore, the slide bearing 34 to be described later is pressed in the assembled state. The sealing convex portion 40 has such a height that the coefficient of friction (sliding performance) between the upper collar sliding surface 10a formed by the bottom surface 34a of the slide bearing 34 and the lower collar sliding surface 20a of the lower collar 20 does not change. It is.

  Further, as shown in FIG. 3A, the sealing convex portion 40 formed in a circular shape when viewed from the bottom is provided with four dividing portions 41 at equal intervals so as to face each other across the center in the circumferential direction. Yes. In other words, in the present embodiment, the arc-shaped convex portions 40a having an arc shape of about ¼ of the circumference are arranged concentrically in four directions at predetermined intervals, and are substantially circular in a bottom view. The convex part 40 for sealing is formed, and the part between the ends of the arc-shaped convex part 40a is defined as a dividing part 41.

  Note that the total angle (interval) of the plurality of divided portions 41 is larger than 0 degree and 180 degrees in the entire substantially circular sealing convex part 40 (peripheral length of a virtual circle formed by the plurality of arc-shaped convex parts 40a). It is set to be in the following range, preferably 40 degrees to 180 degrees, more preferably 80 degrees to 160 degrees.

  In the present embodiment, the interval between the divided portions 41 is set to 20 degrees in the circumferential direction. Therefore, the total angle (interval) of the four divided portions 41 is 80 degrees. In other words, the degree of opening by the four divided portions 41 with respect to the entire substantially circular sealing convex portion 40 (peripheral length of the virtual circle formed by the plurality of arc-shaped convex portions 40a) is in the range of more than 0% and 50% or less. Of these, 22% is set.

The slide bearing 34 has a self-lubricating property and is made of a fluororesin (for example, polytetrafluoroethylene (PTFE)) having a circular surface in plan view, which is the same as the slide plate 22 or has a lower coefficient of friction than the slide plate 22. It is a state. Further, a circular dimple 35 that can hold the lubricant 50 is formed on the bottom surface 34 a of the slide bearing 34. The bottom surface 34a is the upper rod sliding surface 10a that slides with the lower rod sliding surface 20a that is the surface of the slide plate 22 of the lower rod 20.
The slide bearing 34 has an appropriate deformability and strength, and is formed with a thickness that is affected by the sealing projection 40 described above.

  The dimple 35 as the holding portion has an upward arcuate concave shape (hemispherical depression) in the cross section, and has a maximum depth of about 1 mm, but is not limited thereto, and the minimum depth is 0.5 mm. The maximum depth may be formed so as not to penetrate the slide bearing 34.

As shown in FIG. 3B, the dimples 35 are arranged in a staggered manner on the bottom surface 34a of the slide bearing 34 so that the closest three are arranged in an equilateral triangle. That is, in a state where a plurality of dimples 35 are arranged in a row, the dimples 35 in an adjacent row are arranged adjacent to each other without being adjacent to each other, so that the dimples 35 are staggered or zigzag-shaped. Is arranged.
The shape of the dimple 35 is not limited to the upward arcuate concave shape, and may be any shape that can hold the lubricant 50 described later, such as an upward triangular shape or a rectangular shape in the cross section.

  Thus, the sliding part 30 of the upper collar 10 of the support device 1 constituting each element inserts the elastic plate 31, the seal ring 32, the piston 33, and the slide bearing 34 in this order from the bottom into the mounting recess 11a. (See FIG. 4). A portion of the slide bearing 34 that is pressed by the sealing convex portion 40 constitutes a substantially circumferential high-pressure contact portion 42. In other words, the portion pressed by the arc-shaped convex portion 40a constituting the sealing convex portion 40 constitutes the high-pressure contact portion 42, and the high-pressure contact portion 42 opens the portion corresponding to the dividing portion 41 and is substantially Four places are arranged in the circumferential direction so as to have a circular shape.

  Further, in the bearing device 1, the dimple 35 formed on the bottom surface 34a of the slide bearing 34 that constitutes the upper rod sliding surface 10a is filled with the lubricant 50, and the upper rod sliding surface 10a, the lower rod sliding surface 20a, and so on. Are configured to be slidably opposed to each other and assembled with the upper rod 10 and the lower rod 20.

  In the bearing device 1 configured as described above, the sealing convex portion 40 presses the upper surface of the slide bearing 34 downward with a pressure higher than that of other portions. As shown in FIG. 4C illustrating the contact pressure p of the upper collar sliding surface 10a acting on 20a, the portion corresponding to the sealing convex portion 40 is partially higher than the other portions. The high pressure contact portion 42 is used.

  As described above, the lower ridge 20 and the upper ridge 10 are disposed at the opposing portions of the lower building and the upper building, and the sliding surfaces 10a at the opposed portions of the lower ridge 20 and the upper ridge 10 are provided. In the bearing device 1 in which 20a slides, the lower rod sliding surface 20a is formed as a wide sliding surface that is wider in the in-plane direction than the upper rod sliding surface 10a, and the upper rod sliding surface 10a is It is formed with a narrow sliding surface narrower than the wide sliding surface, and the upper collar 10 is provided with a synthetic resin slide bearing 34 that constitutes the narrow sliding surface with the bottom surface 34a, and on the bottom surface 34a of the slide bearing 34, A plurality of dimples 35 for holding the lubricant 50 are provided, a sealing convex portion 40 is provided at a portion where the piston 33 and the slide bearing 34 face each other, and the sealing convex portion 40 formed in a substantially circular shape has an annular direction. At least some Since the dividing unit 41 for disconnection are formed, it can be sliding surface slides at high sliding performance from the beginning to slip.

  More specifically, a sealing convex portion 40 is provided at a portion where the piston 33 and the slide bearing 34 are opposed to each other, and the contact pressure from the upper rod sliding surface 10a to the lower rod sliding surface 20a is higher than the other portions. Can function as a so-called dust seal, and can prevent dust, dust, or other dust from entering the sliding surface of the upper and lower sliding surfaces 10a and 20a. Therefore, it is possible to prevent the sliding performance of the sliding surface from being lowered due to the intrusion of dust.

  In addition, since a plurality of dimples 35 for holding the lubricant 50 are provided on the bottom surface 34a of the slide bearing 34 that constitutes the upper collar sliding surface 10a, the sliding is performed by the lubricant 50 held by the plurality of dimples 35. The sliding performance between the surfaces can be improved, and wear of the synthetic resin slide bearing 34 can be prevented by the lubricant 50 held by the dimple 35.

  Furthermore, since the dividing portion 41 is formed to divide at least a part of the circumferential direction in the convex portion 40 for sealing provided in the facing portion between the piston 33 and the slide bearing 34, the slip performance at the initial operation is reduced. Can be prevented.

  Specifically, the lubricant 50 held by the dimple 35 extends over the entire upper and lower sliding surfaces 10a and 20a as shown in FIG. The shape of the high-pressure contact portion 42 is in a state where leakage to the outer circumferential side is restricted. As described above, the lubricant 50 that spreads over the entire sliding surfaces 10a and 20a and whose leakage to the outer circumferential side is restricted by the high-pressure contact portion 42 is applied to the load of the upper structure supported by the support device 1 (uploading). Load) acts, and the sliding surfaces 10 a and 20 a are brought into close contact with each other via the lubricant 50. Therefore, the sliding surfaces 10a and 20a are in a suction state as if they were in a vacuum state, and the apparent static friction coefficient increases.

  On the other hand, the lubricant 50 on which the overload is applied is divided by the dividing portion 41 that divides at least a part of the circumferential direction of the substantially circular sealing convex portion 40 provided at the portion facing the slide bearing 34. Since it can escape, the sliding surfaces 10a and 20a can slide with high sliding performance from the initial movement without causing the above-described adsorption state.

  Moreover, since the parting part 41 is provided in the position which opposes on both sides of the center of the upper collar sliding surface 10a, in any sliding direction, the sliding surfaces 10a, 20a can slide.

  More specifically, when the dividing portion 41 is provided only at one of the opposing positions across the center of the upper collar sliding surface 10a, sliding to the side where the dividing portion 41 is provided and to the opposite side Although there is a possibility that the sliding performance differs depending on the sliding, in this embodiment, it is provided at a position opposite to the center of the upper collar sliding surface 10a, so that it is at the initial motion in any sliding direction. Therefore, the sliding surfaces 10a and 20a can slide with high sliding performance.

  In addition, since a plurality of divided portions 41 are formed at equal intervals in the circumferential direction, that is, the divided portions 41 can be dispersedly arranged in the circumferential direction, for example, the overload acts on the lubricant 50 as an uneven load. Even in this case, the lubricant 50 can escape from the dividing portion 41, and the sliding surfaces 10a and 20a can slide with high sliding performance from the initial movement.

  Moreover, 22% of the range in which the degree of opening by the dividing portion 41 with respect to the entire substantially circular sealing convex portion 40 (peripheral length of the virtual circle formed by the plurality of arc-shaped convex portions 40a) is greater than 0% and 50% or less. Therefore, a sufficient function as a dust seal can be exhibited, and even when an overload is applied, the lubricant 50 is released, and the sliding performance at the initial operation can be improved.

  More specifically, when the degree of opening by the dividing portion 41 with respect to the entire substantially circular sealing convex portion 40 (peripheral length of a virtual circle formed by a plurality of arc-shaped convex portions 40a) is 0%, that is, the dividing portion 41 is If it is not formed, the lubricant 50 on which the applied load acts cannot be released, so that it becomes a so-called adsorption state as described above, and sufficient sliding performance cannot be ensured at the initial movement.

  Further, when the degree of opening by the dividing portion 41 with respect to the entire substantially circular sealing convex portion 40 (peripheral length of the virtual circle formed by the plurality of arc-shaped convex portions 40a) is 50% or more, that is, the plurality of divided portions 41. Is longer than the length of the sealing convex portion 40 (the total length of the arc-shaped convex portions 40a) formed by a plurality of arc-shaped convex portions 40a arranged in the circumferential direction. However, the length of the high-pressure contact portion 42 functioning as a dust seal is shortened, so that the intrusion of dust between the sliding surfaces 10a and 20a cannot be sufficiently prevented. There is a risk that slippage performance may be reduced due to intrusion.

  On the other hand, the degree of opening by the dividing portion 41 with respect to the entire substantially circular sealing convex portion 40 (peripheral length of a virtual circle formed by the plurality of arc-shaped convex portions 40a) is greater than 0% and not more than 50%. By setting the ratio to 22%, the length of the high-pressure contact portion 42 formed by the sealing convex portion 40 can be secured, so that a sufficient function as a dust seal can be exhibited and the lubricant 50 can be applied even when an overload is applied. The slip performance at the time of initial movement can be improved.

Further, since the dimples 35 are arranged in a staggered manner, the dimples 35 can be arranged in a dense state at equal intervals, and the sliding performance can be further improved.
Further, since the slide bearing 34 is a PTFE plate material having a suitable deformability, strength and desired sliding performance, and having a thickness affected by the above-described sealing convex portion 40, the slide bearing 34 has a desired sliding performance, The high-pressure contact portion 42 by the sealing convex portion 40 can be easily formed.

Further, since the sealing convex portion 40 is provided on the bottom surface 33b of the piston 33, the sealing convex portion 40 having a desired shape can be formed by easy processing without using a separate member.
More specifically, when the arcuate convex portion 40a, which is a separate member, is mounted to form the sealing convex portion 40, the number of parts may increase or the mounting may be forgotten. Further, it is difficult to form the sealing convex portion 40 on the synthetic resin slide bearing 34 as compared with the case where the sealing convex portion 40 is formed on the highly workable piston 33, and it is also suitable from the viewpoint of cost. Absent.

  In contrast, by providing the sealing convex portion 40 on the bottom surface 33b of the piston 33, which is the opposed portion of the piston 33 and the slide bearing 34, it is possible to achieve the desired by an easy process as compared with the case where the piston 33 and the slide bearing 34 are provided. The convex part 40 for a seal | sticker of the shape of can be comprised.

  In the above description, the four dividing portions 41 are provided in the circumferential direction of the sealing convex portion 40. However, as shown in FIG. 5, eight dividing portions 41 may be provided on the sealing convex portion 40. As described above, the eight divided portions 41 provided on the sealing convex portion 40 are also formed at intervals of 20 degrees in the circumferential direction.

Therefore, the total angle of the eight divided portions 41 is 160 degrees, and the opening ratio of the divided portions 41 with respect to the entire substantially circular sealing convex portion 40 is 44%.
Thus, even if eight dividing portions 41 are provided, the degree of opening by the dividing portion 41 with respect to the whole of the substantially circular sealing convex portion 40 is 44% out of the range of 0% to 50%. The effects described above can be achieved.

  Thus, the degree of opening by the plurality of divided portions 41 in the length of the substantially circular sealing convex portion 40 (peripheral length of the virtual circle formed by the plurality of arc-shaped convex portions 40a) is greater than 0% and 50% or less. If the opening degree is in the range of 10% or more and 50% or less, more preferably, the opening degree is in the range of 20% or more and 45% or less, the number thereof is not limited. Even if it comprises, the above-mentioned effect can be produced.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment, the first building of the present invention corresponds to the lower building,
Similarly,
The second building corresponds to the superstructure,
The first rod corresponds to the lower rod 20,
The second kite corresponds to the upper kite 10,
The bearing device corresponds to the bearing device 1,
The sliding surface and the wide sliding surface of the first rod correspond to the lower rod sliding surface 20a,
The sliding surface of the second rod and the second sliding surface correspond to the upper rod sliding surface 10a,
The sliding member corresponds to the slide bearing 34,
The support member corresponds to the piston 33,
Lubricant corresponds to Lubricant 50,
The holding part corresponds to the dimple 35,
The high pressure contact portion corresponds to the high pressure contact portion 42,
The convex portion corresponds to the sealing convex portion 40,
Although a parting part respond | corresponds to the parting part 41, it is not limited to the said embodiment.

  In the above description, the bearing device 1 which is an omnidirectional movable bearing that can move in any in-plane direction on the sliding surfaces 10a and 20a of the seismic isolation structure has been described, but it can move in one direction in the in-plane direction. It may be a one-way movable bearing, for example, a bearing device for supporting the main girder on the bridge pier, a bearing device for supporting the crossing corridor connecting the building and the building from the building, or a bearing for supporting the truss roof with a pillar. You may use as a support apparatus in the expansion structure which connects an apparatus or buildings.

  In the above description, the sealing convex portion 40 is formed on the bottom surface 33b of the piston 33. However, the sealing convex portion 40 may be formed on the top surface of the slide bearing 34, or may be formed of a member separate from the piston 33 and the slide bearing 34. Good.

Further, the plurality of arc-shaped convex portions 40a are arranged in a circular shape to form the sealing convex portion 40, but may be formed in any ring shape such as an elliptical shape, a substantially rectangular shape, or a substantially polygonal shape such as a substantially triangular shape. Good.
Moreover, the cross-sectional shape of the convex part 40 for a seal | sticker is not limited to cross-sectional convex shape, A cross-sectional view triangular shape etc. may be sufficient.

  In the above description, the dividing direction of the sealing convex portion 40 by the dividing portion 41, that is, the dividing portion 41 penetrating in the radial direction with respect to the substantially circular sealing convex portion 40 is provided. As described above, the dividing portion 41 having various shapes can be formed. FIG. 6 is a partially enlarged bottom view of the piston 33 provided with various dividing portions 41.

Specifically, the dividing portion 41a shown in FIG. 6A is provided so as to penetrate the sealing convex portion 40 in the radial direction, but the outer diameter is narrower than the inner diameter. It is formed in a square shape.
As described above, the C-shaped split portion 41a having a narrower width on the outer diameter side than the inner diameter side can release the lubricant 50 on which the applied load is applied, thereby improving the sliding performance at the initial movement. In addition, when the high-pressure contact portion 42 functions as a dust seal, it is possible to further prevent foreign matter from entering from the outside of the narrow diameter opening.

Moreover, the dividing part 41b shown in FIG.6 (b) is provided so that the convex part 40 for sealing may be penetrated in the direction which cross | intersects with respect to a radial direction.
As described above, the dividing portion 41b penetrating in the direction intersecting the radial direction can release the lubricant 50 on which the applied load is applied, so that the sliding performance in the initial movement can be improved and the radial seal is used. Compared with the divided part of the same width that penetrates the convex part 40, the effective opening in the radial direction by the divided part 41b in the intersecting direction is narrowed, so that the intrusion of foreign matter is more prevented when the high-pressure contact part 42 functions as a dust seal. Can do.

Furthermore, although the dividing part 41c shown in FIG. 6C penetrates the sealing convex part 40 in the radial direction, an arcuate inner arc-shaped convex part 43 having a width equal to or larger than the width of the dividing part 41c is provided inside the radial part. ing.
In this way, the dividing portion 41c in which the arc-shaped inner arc-shaped convex portion 43 having a width equal to or larger than the width of the dividing portion 41c is provided on the inner side of the diameter constitutes the sealing convex portion 40 even when the overload acts on the lubricant 50. Since the lubricant 50 can be released between the arcuate convex portion 40a and the inner arcuate convex portion 43 and through the dividing portion 41c, the sliding performance at the initial operation can be improved, and the convex portion 40 for sealing is provided in the radial direction. The inner arc-shaped convex portion 43 provided on the inner diameter side of the penetrating part 41c can further prevent foreign matter from entering when the high-pressure contact portion 42 functions as a dust seal.

  Furthermore, as shown in FIG. 6 (d), the arc-shaped convex portion 40a and the small-diameter arc-shaped convex portion 40b having a smaller diameter than the arc-shaped convex portion 40a are arranged to face each other with a gap in the radial direction. It may comprise, and the parting part 41d may be formed between the edge parts.

  In this way, the arc-shaped convex portion 40a and the small-diameter arc-shaped convex portion 40b are arranged to face each other with a gap in the radial direction, and the sealing convex portion 40 is formed between the ends of the arc-shaped convex portion 40a and the small-diameter arc-shaped convex portion 40b. Since the lubricant 50 on which the load is applied can be released by the radially divided portion 41d formed between the two, the sliding performance at the initial movement can be improved and the divided portion 41d intersecting in the radial direction can increase the pressure. When the contact portion 42 functions as a dust seal, it is possible to further prevent foreign matter from entering.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 ... Bearing apparatus 10 ... Upper collar 10a ... Upper collar sliding surface 20 ... Lower collar 20a ... Lower collar sliding surface 33 ... Piston 34 ... Slide bearing 35 ... Dimple 40 ... Sealing convex part 41 ... Dividing part 42 ... High pressure contact Part 50 ... Lubricant

Claims (6)

The first building and the second building have a first fence and a second fence arranged at the facing portions of the first building and the second building, and the sliding surfaces at the facing portions of the first and second fences are slid. A moving bearing device,
The second rod is
A sliding member made of synthetic resin having a second sliding surface sliding with the first sliding surface of the first rod, and a support member supporting the sliding member;
The second sliding surface of the sliding member is provided with a plurality of holding portions for holding a lubricant,
A substantially annular convex shape that forms a substantially annular high-pressure contact portion on the second sliding surface at a portion where the sliding member and the support member are opposed to each other, the contact pressure with respect to the first sliding surface being higher than other portions. And
A support device in which a dividing portion that divides at least part of the annular direction of the convex portion formed in a substantially annular shape is formed. The sliding surface of the first rod is formed as a wide sliding surface wider in the in-plane direction than the sliding surface of the second rod, and the sliding surface of the second rod is a narrow sliding surface. Formed,
The dividing portion is
The support device according to claim 1, wherein the support device is provided at a position facing each other across the center of the second sliding surface. The support device according to claim 1 or 2, wherein the high-pressure contact portion is formed with a plurality of the dividing portions at equal intervals in an annular shape. The bearing device according to claim 3, wherein an opening degree by the dividing portion in the convex portion formed in a substantially annular shape is larger than 0% and not larger than 50%. The support device according to claim 1, wherein the holding portions are arranged in a staggered manner. The bearing device according to claim 1, wherein the sliding member is made of a fluororesin.

Images