JP2020076441A - Slide bearing - Google Patents

Abstract

To provide a slide bearing which can prevent a foreign substance from included between a lower shoe and a slider.SOLUTION: A slide bearing 10 includes: a lower shoe 11 having a V-recessed lower slide contact surface 11b1 on an upper surface thereof; an upper shoe 12 having a Λ-recessed upper slide contact surface 12b1 on a lower surface thereof; a slider 13 having a lower slide surface 14a slidable with respect to the lower slide contact surface 11b1 in one direction and an upper slide surface 15a slidable with respect to the upper slide contact surface 12b1 in the other direction perpendicular to the one direction; and a dust cover 30 provided to the slider 13. The dust cover 30 covers an exposed part 11b2 of the lower slide contact surface 11b1 with the lower slide surface 14a being positioned at a center in the one direction of the lower slide contact surface 11b1.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a sliding bearing.

Between the upper structure and the lower structure of the structure as a seismic isolation mechanism that reduces the transfer of energy generated by wind, heat expansion, and vibration caused by earthquakes to structures such as buildings and detached houses. There is known a slide bearing which is disposed in the above and supports the upper structure by sliding it horizontally with respect to the lower structure during vibration.
Such a sliding bearing is generally provided between a lower shoe fixed to the upper part of the lower structure of the structure, an upper shoe fixed to the bottom of the upper structure of the structure, and between the lower shoe and the upper shoe. And an intervening slider (see, for example, Patent Document 1).

  The sliding bearing described in Patent Document 1 has a lower shoe having a V-shaped concave lower sliding contact surface on an upper surface, an upper shoe having a Λ-shaped concave upper sliding contact surface on a lower surface, and a lower sliding contact surface and an upper surface. And a slider interposed between the sliding contact surface and the sliding contact surface. The slider includes a V-shaped convex lower sliding surface that is slidable in the XX direction along the lower sliding contact surface, and a YY direction that is orthogonal to the XX direction along the upper sliding contact surface. Has a slidable Λ-shaped convex upper sliding surface.

  Normally, the slider is located at the longitudinal central portion of the lower sliding contact surface of the lower shoe and in the longitudinal central portion of the upper sliding surface of the upper shoe. Then, at the time of vibration due to an earthquake or the like, the slider slides in the XX direction along the lower sliding contact surface so as to follow the vibration, and slides in the YY direction along the upper sliding contact surface. To do.

JP, 2013-130216, A

  In the normal state, the slider is located in the central portion in the longitudinal direction on the lower sliding contact surface of the lower shoe, so dust is not present in the exposed parts other than the central portion in the longitudinal direction. Foreign matter such as In this case, when the slider slides on the lower shoe during vibration such as an earthquake, foreign matter is caught between the lower sliding surface of the slider and the lower sliding contact surface of the lower shoe. The lower sliding surface and the lower sliding contact surface may be damaged. When such damage occurs, the slider cannot sufficiently follow the vibration and the seismic isolation function deteriorates.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a sliding bearing that can prevent foreign matter from being caught between the lower shoe and the slider.

  The slide bearing of the present invention has a V-shaped concave lower sliding contact surface on the upper surface, a lower shoe fixed to the upper part of the lower structure of the structure, and a Λ-shaped concave upper sliding contact surface on the lower surface. An upper shoe fixed to the bottom of the upper structure of the structure, a lower sliding surface slidable in one direction with respect to the lower sliding contact surface, and one direction with respect to the upper sliding contact surface A slider having an upper sliding surface slidable in the other direction orthogonal to each other, and the lower sliding surface provided on the slider, wherein the lower sliding surface is located at the central portion of the lower sliding contact surface in the one direction. And a dust cover that covers at least a part of the exposed portion of the lower sliding contact surface.

  According to the present invention, the dust cover provided on the slider has the lower sliding surface located at the center of the lower sliding contact surface of the lower shoe in the one direction. Since at least a part of the exposed portion of the lower sliding contact surface is covered, foreign matter such as dust can be prevented from adhering to the exposed portion. Thereby, when the slider slides on the lower shoe, it is possible to prevent foreign matter from being caught between the lower shoe and the slider. As a result, the lower sliding contact surface of the lower shoe and the lower sliding surface of the slider are less likely to be damaged, so that it is possible to suppress the deterioration of the seismic isolation function.

The dust cover preferably includes a flexible cover body and a reinforcing body that reinforces the cover body.
In this case, since the flexible cover body is reinforced by the reinforcing body, even if the cover body protrudes from the lower shoe due to the sliding of the slider against the lower sliding contact surface, the protruding portion is downward. Never drool. As a result, foreign matter such as dust on the ground can be prevented from adhering to the protruding portion of the cover body, so that the foreign matter can be prevented from adhering to the exposed portion of the lower sliding contact surface via the cover body. it can.

It is preferable that the dust cover has a contact surface that comes into surface contact with at least a part of the lower sliding contact surface.
In this case, the contact surface of the dust cover can effectively prevent foreign matter such as dust from adhering to the exposed portion of the lower sliding contact surface of the lower shoe.

It is preferable that the dust cover cover the entire exposed portion of the lower sliding contact surface with a margin around the exposed portion.
In this case, since the dust cover can surely cover the entire exposed portion of the lower sliding contact surface of the lower shoe, it is possible to further effectively prevent foreign matter such as dust from adhering to the exposed portion.

It is preferable that the slide bearing further includes a skirt member that hangs downward from the exposed portion of the dust cover.
In this case, since the skirt member covers the area between the dust cover and the exposed portion of the lower sliding contact surface, it is possible to prevent foreign matter such as dust from entering between the dust cover and the exposed portion of the lower sliding contact surface. can do.

The dust cover includes a fixing portion having one end in the one direction fixed to the slider and a rotating portion connected to the other end of the fixing portion in the one direction so as to be vertically rotatable. , Are preferably provided.
In this case, for example, when the rotating portion of the dust cover comes into contact with the wall surface of the structure by sliding the slider against the lower sliding contact surface, the rotating portion does not contact the fixed portion. By rotating upward, the impact due to the contact between the rotating portion and the wall surface can be mitigated. This can prevent the dust cover from coming into contact with the outside such as the wall surface and being damaged.

The rotating portion is rotatable between a lower rotating position and an upper rotating position, and a rotating angle of the rotating portion between the lower rotating position and the upper rotating position is: It is preferable that the rotating portion is set to an angle such that the rotating portion can rotate downward from the upper rotating position by its own weight.
In this case, for example, after the rotating portion of the dust cover comes into contact with the wall surface of the structure or the like and rotates upward from the lower rotating position to the upper rotating position, the slider slides in a direction away from the wall surface. Then, the contact between the rotating portion and the wall surface is released, so that the rotating portion rotates downward from the upper rotating position by its own weight. Therefore, even if the rotating portion rotates upward from the lower rotating position, the rotating portion can be automatically rotated downward by the sliding of the slider to return to the lower rotating position.

  According to the present invention, it is possible to prevent foreign matter from being caught between the lower shoe and the slider.

It is a top view which shows the sliding bearing which concerns on 1st Embodiment of this invention. FIG. 2 is a sectional view taken along the line AA of FIG. 1. FIG. 2 is a sectional view taken along the line BB of FIG. 1. It is the perspective view which looked at a slider from the lower part. It is the perspective view which looked at a slider from the upper part. It is a top view of a slide bearing showing a state where a pair of dust covers are fixed to a slider. It is a CC arrow line view of FIG. It is a side view showing the state where the dust cover constituted only with the cover body slid with the slider. It is a side view showing the state where the dust cover of a 1st embodiment slid with a slider. It is a side view which shows the sliding bearing which concerns on 2nd Embodiment of this invention. FIG. 11 is an end view taken along the line DD of FIG. 10. It is a side view showing the state where the dust cover of a 2nd embodiment slid with a slider. It is a side view which shows the sliding bearing which concerns on 3rd Embodiment of this invention. It is a side view showing the state where the dust cover of a 3rd embodiment slid with a slider.

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Note that at least a part of the embodiments described below may be arbitrarily combined.
[First Embodiment]
[Overall structure of sliding bearing]
FIG. 1 is a plan view showing a sliding bearing according to the first embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA of FIG. 1 and 2, the sliding bearing 10 is interposed between a lower structure 1 and an upper structure 2 of a structure such as a building or a detached house, and when a vibration due to wind, heat expansion, an earthquake or the like occurs, The upper structure 2 is supported by sliding horizontally with respect to the lower structure 1 so as to follow the vibration.

  The sliding bearing 10 of the present embodiment includes a lower shoe 11 fixed to the upper surface of the lower structure 1 via the lower base plate 3, and an upper shoe 12 fixed to the bottom surface of the upper structure 2 via the upper base plate 4. A slider 13 interposed between the lower shoe 11 and the upper shoe 12 and a pair of dust covers 30 (see FIG. 6) fixed to the slider 13. Note that the dust cover 30 is not shown in FIGS. 1 and 2 (the same applies to FIGS. 3 to 5).

[Lower shoe]
The lower shoe 11 is, for example, a lower shoe main body 11a made of a block body formed in a substantially rectangular parallelepiped shape, a lower slide plate 11b fixed to the upper surface of the lower shoe main body 11a, and fixed to both side surfaces of the lower shoe main body 11a. The lower side slide plates 11c are formed by a pair of lower side slide plates 11c and a pair of stoppers 11d fixed to both end surfaces of the lower shoe main body 11a in the longitudinal direction. The lower shoe 11 is arranged such that its longitudinal direction is oriented in one direction (XX direction in the drawing). The upper surface of the lower shoe main body 11a is formed in a gentle V-shaped concave shape in a side view.

The lower slide plate 11b and the lower side slide plate 11c are made of, for example, a stainless plate, a surface-treated stainless plate, or a thin plate plated with hard chrome. The lower slide plate 11b is formed along the shape of the upper surface of the lower shoe main body 11a in a side view. An upper surface of the lower slide plate 11b is a V-shaped concave lower slide contact surface 11b1 on which a first lower slide bearing 14 (described later) of the slider 13 slides. The lower sliding contact surface 11b1 is inclined at a predetermined inclination angle θ with respect to the horizontal plane.
The lower side slide plate 11c is formed in a gentle V shape corresponding to the shape of the upper surface of the lower shoe main body 11a in a side view. An outer surface of the lower side slide plate 11c is a lower guide sliding contact surface 11c1 on which a second lower sliding bearing 18 (described later) of the slider 13 slides.

  The stopper 11d is formed so as to extend in the width direction (Y-Y direction) of the lower shoe main body 11a, and both ends in the width direction of the stopper 11d project outward in the width direction from the lower side slide plate 11c. Thus, when the slider 13 slides to both ends in the XX direction, a pair of lower protrusions 17 (described later) of the slider 13 come into contact with both ends of the stopper 11d in the width direction. The slider 13 is prevented from falling off from both ends of the lower shoe main body 11a in the XX direction.

[Upper]
FIG. 3 is a sectional view taken along the line BB of FIG. As shown in FIG. 1 and FIG. 3, the upper shoe 12 includes, for example, an upper shoe main body 12a made of a block body formed in a substantially rectangular parallelepiped shape, an upper slide plate 12b fixed to a lower surface of the upper shoe main body 12a, It is composed of a pair of upper side slide plates 12c fixed to both side surfaces of the upper shoe main body 12a. The upper shoe 12 is arranged with its longitudinal direction oriented in the Y-Y direction that is orthogonal to the longitudinal direction of the lower shoe 11 horizontally. The lower surface of the upper shoe main body 12a is formed in a gentle Λ-shaped concave shape in a side view.

The upper slide plate 12b and the upper side slide plate 12c are made of, for example, a stainless plate, a surface-treated stainless plate, or a hard chrome-plated thin plate. The upper slide plate 12b is formed along the shape of the lower surface of the upper shoe main body 12a in a side view. The lower surface of the upper slide plate 12b is a Λ-shaped concave upper slide contact surface 12b1 on which a first upper slide bearing 15 (described later) of the slider 13 slides. The upper slide contact surface 12b1 is inclined at a predetermined inclination angle θ with respect to the horizontal plane (the same angle as the inclination angle of the lower slide contact surface 11b1 with respect to the horizontal plane).
The upper side slide plate 12c is formed in a gentle Λ shape corresponding to the shape of the lower surface of the upper shoe main body 12a in a side view. The outer surface of the upper side slide plate 12c is an upper guide sliding contact surface 12c1 on which a second upper sliding bearing 23 (described later) of the slider 13 slides.

[Slider]
FIG. 4 is a perspective view of the slider 13 as seen from below. In FIGS. 3 and 4, the slider 13 has a slider body 13a made of, for example, a block body formed in a substantially rectangular shape. The lower surface of the slider body 13a is formed in a gentle V-shaped convex shape corresponding to the lower sliding contact surface 11b1 of the lower shoe 11. Specifically, the lower surface of the slider body 13a is composed of a pair of lower inclined surfaces 13a1 formed so as to gradually project downward from both ends in the XX direction toward the central portion. ..

  The slider 13 has a pair of first lower slide bearings 14 fixed to each lower inclined surface 13a1 of the slider body 13a. Each of the first lower slide bearings 14 is made of, for example, a resin such as a PTFE (polytetrafluoroethylene) type, a PA (polyamide) type, or a POM (polyacetal) type, and the lower surface thereof is a The lower sliding surface 14a is slidable in the XX direction with respect to the contact surface 11b1.

  FIG. 5 is a perspective view of the slider 13 as seen from above. As shown in FIGS. 2 and 5, the upper surface of the slider body 13a is formed in a gentle Λ-shaped convex shape corresponding to the upper sliding contact surface 12b1 of the upper shoe 12. Specifically, the upper surface of the slider body 13a is composed of a pair of upper inclined surfaces 13a2 formed so as to gradually project upward from both ends in the Y-Y direction toward the central portion. ..

  The slider 13 has a pair of first upper slide bearings 15 fixed to the respective upper inclined surfaces 13a2 of the slider body 13a. Each of the first upper plain bearings 15 is made of, for example, a resin such as a PTFE-based, PA-based, or POM (polyacetal) -based resin, and its upper surface is in the YY direction with respect to the upper sliding contact surface 12b1 of the upper shoe 12. The upper sliding surface 15a is slidable.

  As shown in FIG. 4, the slider 13 is provided with a pair of lower guide portions 16 on both sides of the lower inclined surface 13a1 of the slider body 13a. Each lower guide portion 16 is integrally formed with the slider main body 13a so as to project downward from the lower inclined surface 13a1, and both inner ends of the lower protruding portion 17 in the XX direction. And a pair of second lower slide bearings 18 fixed to the section. The second lower slide bearing 18 has a lower guide slide surface 18a slidable with respect to a lower guide slide contact surface 11c1 which is a side surface of the lower shoe 11.

  As shown in FIG. 5, the slider 13 is provided with a pair of upper guide portions 21 on both sides of the upper inclined surface 13a2 of the slider body 13a. Each upper guide portion 21 is integrally formed with the slider main body 13a so as to project above the upper inclined surface 13a2, and both end portions of the inner surface of the upper protrusion portion 22 in the Y-Y direction. And a pair of second upper slide bearings 23 fixed to the section. The second upper slide bearing 23 has an upper guide slide surface 23a slidable with respect to an upper guide slide contact surface 12c1 which is a side surface of the upper shoe 12.

  As a result, the slider 13 is held slidably only in the XX direction by the pair of lower guide portions 16 with respect to the lower shoe 11 and by the pair of upper guide portions 21 with respect to the upper shoe 12. It is held slidably only in the YY direction. Therefore, when a relative displacement occurs in an arbitrary horizontal direction between the lower structure 1 and the upper structure 2 during vibration due to an earthquake or the like, the slider 13 is attached to the lower sliding contact surface 11b1 of the lower shoe 11. Relative displacement in the X-X direction and relative displacement in the Y-Y direction with respect to the upper sliding contact surface 12b1 of the upper shoe 12 cause any between the lower structure 1 and the upper structure 2. Can be displaced following the relative displacement in the horizontal direction (all directions).

  The slider 13 is normally positioned (when not vibrating) at the reference position shown in FIG. At this reference position, the slider 13 is located at the central portion of the lower shoe 11 in the longitudinal direction (XX direction) and at the central portion of the upper shoe 12 in the longitudinal direction (YY direction).

[Dust cover]
FIG. 6 is a plan view of the slide bearing 10 showing a state where the pair of dust covers 30 are provided on the slider 13. FIG. 7 is a view taken in the direction of arrows CC in FIG. The upper shoe 12 is not shown in FIGS. 6 and 7. 6 and 7, in the pair of dust covers 30, the slider 13 is located at the reference position, that is, the lower sliding surface 14a of the slider 13 is at the lower sliding contact surface 11b1 of the lower shoe 11. It covers the exposed portion of the lower sliding contact surface 11b1 excluding the central portion in a state of being located at the central portion in the XX direction. In the present embodiment, the pair of dust covers 30 are attached to both side surfaces 13a3 of the slider body 13a in the XX direction. Each dust cover 30 covers the exposed portion 11b2 of the lower sliding contact surface 11b1 exposed on both sides in the XX direction of the slider 13 at the reference position.

Each dust cover 30 includes a flexible cover body 31 and a reinforcing body 32 that reinforces the cover body 31. The cover body 31 is shown with cross hatching in FIG. 7 (the same applies to FIGS. 8 and 9).
The reinforcing body 32 is formed by bending a flat plate member made of a synthetic resin material such as polyvinyl chloride into a substantially L shape, and has a vertical plate portion 33 and a horizontal plate portion 34.

  The vertical plate portion 33 of the reinforcing body 32 is fixed by a plurality of (four in FIG. 6) screws 41 while being in contact with the lower end portion of the side surface 13a3 of the slider body 13a. Specifically, the side surface 13a3 of the slider body 13a is formed with a plurality of screw holes 13a4 in the width direction thereof (see also FIGS. 3 and 4), and the vertical plate portion is formed in these screw holes 13a4. The screw 41 that penetrates 33 in the plate thickness direction is screwed through a washer 42.

  The lateral plate portion 34 of the reinforcing body 32 is arranged above the lower sliding contact surface 11b1 of the lower shoe 11. The length of the horizontal plate portion 34 in the XX direction is formed to be longer than the length of the exposed portion 11b2 of the lower sliding contact surface 11b1 in the same direction by a margin L. Further, the width of the lateral plate portion 34 in the YY direction is formed slightly smaller than the width of the slider body 13a in the same direction, and the allowance dimension W1 is smaller than the width of the lower sliding contact surface 11b1 in the same direction. And a wide margin W2.

  The lower surface 34a of the horizontal plate portion 34 is inclined with respect to the horizontal plane so as to be parallel to the exposed portion 11b2 of the lower sliding contact surface 11b1. That is, the lower surface 34a of the horizontal plate portion 34 is inclined with respect to the horizontal plane such that the lower slide contact surface 11b1 has the same inclination angle θ with respect to the horizontal plane.

  The cover body 31 is made of, for example, a flexible and flexible flat fiber material (felt), and the upper surface of the cover body 31 is bonded to the lower surface 34 a of the lateral plate portion 34 of the reinforcing body 32. As a result, the cover body 31 is reinforced by the reinforcing body 32 so as not to bend. Further, the lower surface 31 a of the cover body 31 is inclined with respect to the horizontal plane so as to be parallel to the lower surface 34 a of the horizontal plate portion 34 with the adhesive layer 35 interposed therebetween. Therefore, like the lower surface 34a of the horizontal plate portion 34, the lower surface 31a of the cover body 31 is inclined with respect to the horizontal plane so that the lower sliding contact surface 11b1 has the same inclination angle θ with respect to the horizontal plane. .

  The length in the XX direction and the width in the YY direction of the cover body 31 are set to have the same dimensions as the horizontal plate portion 34. Further, the cover body 31 has a predetermined thickness, and the lower surface 31a thereof serves as a contact surface that comes into surface contact with the entire exposed portion 11b2 of the lower sliding contact surface 11b1. As a result, the cover body 31 covers the entire exposed portion 11b2 of the lower sliding contact surface 11b1 with the allowances L, W1, W2 around the entire exposed portion 11b2. Since the cover body 31 is made of felt having flexibility as described above, even if the cover body 31 slides together with the slider 13, the cover body 31 scratches the exposed portion 11b2 of the lower sliding contact surface 11b1. It is possible to suppress sticking.

[Effect]
As described above, according to the sliding bearing 10 of the first embodiment, in the state where the lower sliding surface 14a of the slider 13 is located at the central portion of the lower sliding contact surface 11b1 of the lower shoe 11 in the XX direction, Since the dust cover 30 fixed to the slider 13 covers the exposed portion 11b2 except the central portion of the lower sliding contact surface 11b1 of the lower shoe 11, foreign matter such as dust is prevented from adhering to the exposed portion 11b2. can do. Thereby, when the slider 13 slides with respect to the lower shoe 11, it is possible to prevent foreign matter from being caught between the lower shoe 11 and the slider 13. As a result, the lower slide contact surface 11b1 of the lower shoe 11 and the lower slide surface 14a of the slider 13 are less likely to be damaged, so that the seismic isolation function can be prevented from deteriorating.

  Further, since the lower surface 31a of the cover body 31 is in surface contact with the exposed portion 11b2 of the lower sliding contact surface 11b1, it is possible to effectively prevent foreign matter from adhering to the exposed portion 11b2 of the lower sliding contact surface 11b1.

  Further, since the cover body 31 having flexibility of the dust cover 30 is reinforced by the reinforcing body 32, the following operational effects are obtained. For example, as shown in FIG. 8, when the dust cover 30 is composed only of the flexible cover body 31, the slider 13 is located on one side of the lower shoe 11 in the XX direction (in the figure). When the cover main body 31 on the one side slides out from the lower shoe 11, the protruding portion 31b hangs downward and contacts the ground, and foreign matter such as dust on the ground moves to the protruding portion 31b. It may adhere. In this case, when the slider 13 slides to the other side (left side in the figure) in the XX direction with respect to the lower shoe 11 from the state shown in FIG. 8, the foreign matter attached to the protruding portion 31b slides down. It adheres to the exposed portion 11b2 of the contact surface 11b1. On the other hand, in the present embodiment, as shown in FIG. 9, the slider 13 slides on one side in the XX direction with respect to the lower shoe 11 so that the cover body 31 on the one side moves to the lower shoe. Even if it protrudes from 11, the protruding portion 31b is reinforced by the reinforcing body 32 and therefore does not hang downward. As a result, foreign matter such as dust on the ground can be prevented from adhering to the protruding portion 31b of the cover body 31, so that the foreign matter is exposed on the lower sliding contact surface 11b1 through the protruding portion 31b of the cover body 31. It can be prevented from adhering to the portion 11b2.

  Further, since the cover body 31 covers the entire exposed portion 11b2 of the lower sliding contact surface 11b1 with margins L, W1, W2 around the exposed portion 11b2, the cover body 31 surely covers the entire exposed portion 11b2. be able to. As a result, it is possible to more effectively prevent foreign matter from adhering to the exposed portion 11b2 of the lower sliding contact surface 11b1.

[Second Embodiment]
FIG. 10 is a side view showing the sliding bearing 10 according to the second embodiment of the present invention. The sliding bearing 10 of the present embodiment differs from that of the first embodiment in that the skirt member 50 is provided on the dust cover 30.
In FIG. 10, the skirt member 50 includes a pair of side skirts 51 that hang downward from both end portions (portions of allowances W1 and W2 (see FIG. 6)) in the width direction of the dust cover 30, and a longitudinal direction of the dust cover 30. It is configured by an end skirt 52 that hangs downward from an outer end portion (a portion of the margin L (see FIG. 6)).

  11 is an end view taken along the line DD of FIG. 10 and 11, each side skirt 51 is made of, for example, a rubber material, and is formed to extend in the vertical direction on both sides in the width direction of the dust cover 30. The upper end of each side skirt 51 is fixed to both ends of the dust cover 30 in the width direction of the reinforcing body 31 (the horizontal plate portion 34). In the state shown in FIG. 10, the lower end portion of each side skirt 51 is formed to extend below the exposed portion 11b2 on the outer side in the width direction of the exposed portion 11b2 of the lower sliding contact surface 11b1.

  For example, as shown in FIG. 12, when the slider 13 slides on one side of the lower shoe 11 in the XX direction (on the right side in the figure), the other side of the slider 13 in the XX direction is moved. A gap S is formed between the cover main body 31 and the exposed portion 11b2 of the lower sliding contact surface 11b1 located on the side (the left side in the drawing). For this reason, it is preferable that the vertical length of the side skirt 51 is set to a length that allows the side skirt 51 to cover the gap S from the outer side in the width direction.

  In FIG. 10, the end skirt 52 is made of, for example, a rubber material, and is formed to extend obliquely downward from the outer end portion of the dust cover 30 in the longitudinal direction. The upper end of the end skirt 52 is fixed to the outer end of the reinforcing body 31 in the longitudinal direction. In the state shown in FIG. 10, the lower end portion of the end skirt 52 of the present embodiment is formed to extend below the exposed portion 11b2 on the outer side in the longitudinal direction of the exposed portion 11b2 of the lower sliding contact surface 11b1.

The length in the vertical direction of the end skirt 52 is set to a length such that the end skirt 52 located on the other side in the XX direction can cover the gap S from the outside in the longitudinal direction in the state shown in FIG. Preferably. The skirt member 50 may be composed of only the side skirt 51 or may be composed of only the end skirt 52.
The other configuration of the present embodiment is similar to that of the first embodiment, and thus the description is omitted.

  As described above, according to the sliding bearing 10 of the second embodiment, the same operational effects as those of the first embodiment are exhibited, and the following operational effects are exhibited. That is, the periphery between the dust cover 30 and the exposed portion 11b2 is covered by the skirt member 50 that hangs downward from the marginal dimensions L, W1, W2 of the dust cover 30 below the exposed portion 11b2 of the lower sliding contact surface 11b1. be able to. As a result, it is possible to prevent foreign matter from entering between the dust cover 30 and the exposed portion 11b2 of the lower sliding contact surface 11b1. Therefore, it is possible to more effectively prevent foreign matter from adhering to the exposed portion 11b2. be able to.

[Third Embodiment]
FIG. 13 is a side view showing the sliding bearing 10 according to the third embodiment of the present invention. The dust cover 30 in the sliding bearing 10 of the present embodiment has a fixed portion 30A whose one end in the XX direction is fixed to the slider 13 and a vertical portion with respect to the other end of the fixed portion 30A in the XX direction. It is different from the first embodiment in that it is divided into a rotating portion 30B that is rotatably connected.
In FIG. 13, the fixing portion 30A includes a flexible cover body 31A and a reinforcing body 32A that reinforces the cover body 31A. Similarly, the rotating portion 30B includes a flexible cover body 31B and a reinforcing body 32B that reinforces the cover body 31B.

  The reinforcing body 32A and the reinforcing body 32B are obtained by dividing the reinforcing body 32 (see FIG. 7) of the first embodiment into two in the middle of the lateral plate portion 34 in the longitudinal direction. Therefore, the reinforcing body 32A includes the vertical plate portion 33 and the horizontal plate portion 34A, and the reinforcing body 32B includes only the horizontal plate portion 34B. In addition, in the present embodiment, the length of the lateral plate portion 34B of the reinforcing body 32B in the XX direction is formed to be shorter than the length of the lateral plate portion 34A of the reinforcing body 32A in the same direction, but the present invention is not limited to this. It is not something that will be done.

  The cover main body 31A and the cover main body 31B are obtained by dividing the cover main body 31 (see FIG. 7) of the first embodiment into two in the middle in the longitudinal direction in correspondence with the division of the reinforcing bodies 32A and 32B. is there. In the present embodiment, the length of the cover body 31B in the XX direction is formed shorter than the length of the cover body 31A in the same direction, but the length is not limited to this.

  The reinforcing body 32B of the rotating portion 30B is vertically rotatably connected to the reinforcing body 32A of the fixed portion 30A via a hinge 36. The hinge 36 is provided with a restricting member 37 that restricts further upward rotation of the reinforcing body 32B when the reinforcing body 32B is rotated upward to the upper rotating position shown by the chain double-dashed line in FIG. .. The regulation member 37 of the present embodiment regulates the upward rotation of the reinforcing body 32B by, for example, contact with the rotation-side member 36a of the hinge 36.

On the other hand, when the reinforcing body 32B is rotated downward to the lower rotation position shown by the solid line in FIG. 13, the left end surface of the reinforcing body 32B in the drawing contacts the right end surface of the reinforcing body 32A in the drawing, Further downward rotation of the reinforcing body 32B is restricted.
As described above, the rotating portion 30B is rotatable with respect to the fixed portion 30A between the lower rotating position and the upper rotating position.

The rotation angle α between the lower rotation position and the upper rotation position of the rotation unit 30B is set to an angle at which the rotation unit 30B can rotate downward from the upper rotation position by its own weight. For example, in the present embodiment, the member 36a on the rotating side of the hinge 36 serves as the restricting member 37 at the position (upward rotating position) where the rotating portion 30B has rotated to the maximum angle at which it can rotate downward due to its own weight. The shape and the mounting position of the regulating member 37 are set so as to abut.
The other configuration of the present embodiment is similar to that of the first embodiment, and thus the description is omitted.

  The rotating portion 30B may be vertically rotatably connected to the fixed portion 30A by a mechanism other than the hinge 36. Further, although the dust cover 30 of the present embodiment is divided into two in the longitudinal direction, it may be divided into three or more and the adjacent divisions may be rotatably connected at each division point. Further, in the present embodiment, the regulation member 37 regulates the upward rotation of the rotating portion 30B, but if the rotation angle α of the rotating portion 30B is small, the regulating member 37 need not be provided.

  As described above, according to the sliding bearing 10 of the third embodiment, the same operational effects as those of the first embodiment are exhibited, and the following operational effects are exhibited. For example, as shown in FIG. 13, when the wall surface 1a exists on one side (right side in the drawing) of the lower structure 1 in the XX direction, when the slider 13 slides to the one side, The rotating portion 30B of the dust cover 30 on one side may come into contact with the wall surface 1a. In this case, as shown in FIG. 14, the rotating portion 30B of the dust cover 30 rotates upward with respect to the fixed portion 30A by contacting the wall surface 1a. The impact due to contact can be mitigated. This can prevent the dust cover 30 from coming into contact with the outside of the wall surface 1a and being damaged.

  Further, the turning angle α between the lower turning position and the upper turning position of the turning unit 30B is set to an angle at which the turning unit 30B can turn from its upper turning position by its own weight. For example, when the slider 13 slides to the other side in the XX direction (left side in the drawing) from the state shown in FIG. 14, the rotating portion 30B at the upper rotating position releases the contact with the wall surface 1a. By doing so, it rotates downward to the downward rotation position by its own weight. Therefore, even if the rotating portion 30B rotates upward from the lower rotating position, the rotating portion 30B can be automatically rotated downward by the sliding of the slider 13 and returned to the lower rotating position.

[Other]
In the above embodiment, the dust covers 30 are fixed to both sides of the slider 13 in the sliding direction (XX direction), but may be fixed to only one side in the sliding direction. Further, although the dust cover 30 covers the entire exposed portion 11b2 of the lower sliding contact surface 11b1, it may cover a part of the exposed portion 11b2.

  The dust cover 30 may be composed of only the cover body 31. In this case, the cover body 31 is preferably made of a material that does not allow the protruding portion 31b to hang downward and come into contact with the ground, and is more preferably made of a non-flexible material such as metal or hard resin. preferable. Further, although the cover body 31 is in surface contact with the exposed portion 11b2 of the lower sliding contact surface 11b1, it may be arranged with a gap from the exposed portion 11b2. Further, the dust cover 30 of the present invention can be applied to the conventional sliding bearing shown in Patent Document 1.

  The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above meaning but by the scope of the claims, and is intended to include the meaning equivalent to the scope of the claims and all modifications within the scope.

1 Lower structure 2 Upper structure 10 Sliding bearing 11 Lower shoe 11b1 Lower sliding contact surface 11b2 Exposed part 12 Upper shoe 12b1 Upper sliding contact surface 13 Slider 14a Lower sliding surface 15a Upper sliding surface 30 Dust cover 30A Fixed part 30B Rotating part 31 Cover body 31a Lower surface (contact surface)
32 Reinforcement body 34a Lower surface 50 Skirt member L, W1, W2 Allowance dimension α Rotation angle

Claims (7)

A lower shoe which has a V-shaped concave lower sliding contact surface on the upper surface and is fixed to the upper part of the lower structure of the structure;
An upper shoe which has a Λ-shaped concave upper sliding contact surface on the lower surface and is fixed to the bottom of the upper structure of the structure,
Sliding having a lower sliding surface slidable in one direction with respect to the lower sliding contact surface and an upper sliding surface slidable in the other direction orthogonal to the one direction with respect to the upper sliding contact surface With a child
A dust cover that is provided on the slider and covers at least a part of an exposed portion of the lower sliding contact surface in a state where the lower sliding surface is located at a central portion of the lower sliding contact surface in the one direction. And a sliding bearing.   The sliding bearing according to claim 1, wherein the dust cover includes a flexible cover body and a reinforcing body that reinforces the cover body.   The sliding bearing according to claim 1, wherein the dust cover has a contact surface that comes into surface contact with at least a part of the lower sliding contact surface.   The slide bearing according to any one of claims 1 to 3, wherein the dust cover covers the entire exposed portion of the lower slide contact surface with a margin around the exposed portion.   The slide bearing according to claim 4, further comprising a skirt member that hangs downward from the exposed portion of the dust cover.   The dust cover includes a fixing portion having one end in the one direction fixed to the slider and a rotating portion connected to the other end of the fixing portion in the one direction so as to be vertically rotatable. The slide bearing according to any one of claims 1 to 5, further comprising: The rotating portion is rotatable between a lower rotating position and an upper rotating position,
The turning angle between the lower turning position and the upper turning position of the turning unit is set to an angle at which the turning unit can turn downward from the upper turning position by its own weight. The sliding bearing according to claim 6.

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