JP2019124291A - Slide bearing - Google Patents

Abstract

To provide a slide bearing which has excellent assembly workability, can achieve downsizing, and is excellent in slide performance despite having a dust seal.SOLUTION: A slide bearing includes: an upper case 2 having an annular recessed part 25 on its lower surface 24; a lower case 3 having an annular protruding part 33, which is inserted into the annular recessed part 25 of the upper case 2 to form an annular space 5, on its upper surface 32; a center plate 4 which is disposed in the annular space 5 and achieves relative rotation between the upper case 2 and the lower case 3; and a dust seal 6 which closes a gap leading to the annular space 5. An outer seal part 60 of the dust seal 6 has a lip part 603 which extends from the annular protruding part 33 of the lower case 3 to the upper side in an axis O direction and contacts with a bottom surface 26 of the annular recessed part 25 of the upper case 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a slide bearing for supporting a load, and more particularly to a slide bearing for supporting a load applied to a shaft member such as a suspension of a vehicle.

  A strut type suspension used for a front wheel of an automobile has a structure in which a piston rod, a shock absorber, and a coil spring are combined, and the steering operation rotates the shock absorber with the coil spring. Therefore, in order to support the load applied to the strut type suspension while allowing smooth rotation of the shock absorber and the coil spring, the upper mount and the upper end of the coil spring are usually a mounting mechanism of the strut type suspension to the vehicle body A bearing is disposed between an upper spring seat that is a spring seat that supports the.

  For example, Patent Document 1 discloses a slide bearing for a strut type suspension. The slide bearing is connected to the upper case, a lower case which is combined with the upper case to form an annular space, a center plate which is disposed in the annular space to realize rotation between the upper case and the lower case, and is connected to the annular space And a dust seal for closing the gap.

  Here, an annular recess is formed on the lower surface of the upper case, and an upper surface of the lower case is inserted into the annular recess of the upper case by being combined with the upper case to form an annular convex that forms an annular space. The part is formed. Further, the dust seal is integrally formed with the lower case, and has a lip portion extending radially outward from the outer peripheral surface side of the annular convex portion of the lower case and in contact with the side wall of the annular recess of the upper case.

Unexamined-Japanese-Patent No. 2017-44226

  By the way, in the slide bearing described in Patent Document 1, in the dust seal, the lip portion extends in the radial direction from the outer peripheral surface side of the annular convex portion of the lower case and contacts the side wall of the annular concave portion of the upper case. It is closing the gap that leads to the space. For this reason, even if the upper case and the lower case move in opposite directions in the radial direction of the slide bearing due to the vibration transmitted to the slide bearing from the vehicle body via the strut type suspension and the radial load applied to the slide bearing. In order to ensure that the lip portion of the dust seal abuts against the side wall of the annular recess of the upper case, the dust seal is formed against the gap between the side wall of the annular recess of the upper case and the outer peripheral surface of the annular convex portion of the lower case. It is necessary to form the lip portion sufficiently long.

  However, if the lip of the dust seal is too long for the gap between the side wall of the annular recess of the upper case and the outer peripheral surface of the annular convex portion of the lower case, the upper case is integrally formed with the lower case When combining, a large force is required, and the workability of slide bearing assembly is degraded. Further, the pressing force of the lip portion of the dust seal against the side wall of the annular recess of the upper case is increased, and the smooth rotation between the upper case and the lower case is hindered.

  In addition, in order to make the lip elastically deformable in the radial direction, it is necessary to increase the gap between the side wall of the annular recess of the upper case and the outer peripheral surface of the annular projection of the lower case to a certain extent. The radial size of the

  Furthermore, when forming the dust seal with the upper and lower molds relatively moving in the axial direction of the dust seal, the lip part extends in the direction (radial direction) different from the moving direction of the upper and lower molds. There is also a problem that the lip is easily deformed.

  The present invention has been made in view of the above circumstances, and an object thereof is a slide bearing which is excellent in assembling workability, can be miniaturized, and is excellent in sliding performance while having a dust seal. It is to provide.

  In order to solve the above problems, according to the present invention, a dust seal for closing a gap connected to an annular space formed by facing a bottom surface of an annular recess formed on the lower surface of an upper case and an annular upper surface of the lower case A lip portion extending axially upward from the annular upper surface side and in contact with the bottom surface of the annular recess of the upper case is provided.

For example, the present invention
A slide bearing for supporting a load,
An upper case having an annular recess on the lower surface;
A lower case having an annular upper surface facing the bottom of the annular recess of the upper case to form an annular space;
A center plate disposed in the annular space to realize relative rotation between the upper case and the lower case;
And a dust seal for closing the gap connected to the annular space,
The dust seal is
And a lip portion extending axially upward from the annular upper surface of the lower case and in contact with the bottom surface of the annular recess of the upper case.

  In the present invention, the lip portion of the dust seal extends axially upward from the annular upper surface side of the lower case and abuts against the bottom surface of the annular recess of the upper case, thereby closing the gap connected to the annular space. Even if the lip of the dust seal is not formed longer than necessary in the gap between the bottom surface of the recess and the annular upper surface of the lower case, the lip of the dust seal is the upper by applying a load in the thrust direction to the slide bearing. Make sure to abut the bottom of the annular recess of the case. For this reason, when combining the upper case with the lower case on which the dust seal is attached, a large force is not necessary, and the workability of assembling the slide bearing is improved. Further, it is possible to suppress an increase in the pressure contact force of the lip portion of the dust seal against the bottom surface of the annular recess of the upper case, thereby preventing the smooth rotation between the upper case and the lower case from being hindered. Furthermore, even if the lip of the dust seal wears due to sliding with the bottom of the annular recess of the upper case, a load in the thrust direction is applied to the slide bearing to make the lip of the dust seal the bottom of the annular recess of the upper case Since it can be made to abut reliably and the sealability does not decrease, the interference between the annular recess of the upper case and the dust seal can be reduced, thereby improving the pivotability between the upper case and the lower case. Can.

  In addition, since it is only necessary for the lip portion to be elastically deformable in the axial direction, it is not necessary to increase the gap between the side wall of the annular recess of the upper case and the outer peripheral surface of the annular convex portion of the lower case. The radial size of the can be reduced.

  Furthermore, when forming the dust seal with the upper and lower molds relatively moving in the axial direction of the dust seal, the lip part extends in the same direction as the moving direction of the upper and lower molds. Can be suppressed to stabilize the performance of the dust seal.

  Therefore, according to the present invention, it is possible to provide a slide bearing which is excellent in assembling workability, can be miniaturized, and excellent in sliding performance while having a dust seal.

1 (A), 1 (B) and 1 (C) are a plan view, a bottom view and a front view of a sliding bearing 1 according to an embodiment of the present invention, and FIG. 1 (D) is It is AA sectional drawing of the sliding bearing 1 shown to FIG. 1 (A). FIG. 2A is an enlarged view of a portion B of the sliding bearing 1 shown in FIG. 1D, and FIG. 2B is an enlarged view of a portion C of the sliding bearing 1 shown in FIG. 3 (A), 3 (B) and 3 (C) are a plan view, a bottom view and a front view of the upper case 2, and FIG. 3 (D) is an upper case shown in FIG. 3 (A). It is DD sectional drawing of 2. FIG. 4 (A), 4 (B) and 4 (C) are a plan view, a bottom view and a front view of the lower case 3, and FIG. 4 (D) is a lower case shown in FIG. 4 (A). 3 is a cross-sectional view taken along line E-E of FIG. 5 (A), 5 (B) and 5 (C) are a plan view, a bottom view and a front view of the center plate 4, and FIG. 5 (D) is a center plate shown in FIG. 5 (A). 5 is a cross-sectional view taken along line F-F of FIG. FIG. 6A is a plan view of the sliding sheet 8, and FIG. 6B is a G-G cross-sectional view of the sliding sheet 8 shown in FIG. FIG. 7 is a figure for demonstrating the modification 1A of the slide bearing 1 which concerns on one embodiment of this invention, and is a figure corresponded to the elements on larger scale of FIG. 2 (B). FIG. 8 is a view for explaining a modification 1B of the slide bearing 1 according to one embodiment of the present invention, and is a view corresponding to a partially enlarged view of FIG. 2 (B).

  Hereinafter, an embodiment of the present invention will be described.

  1 (A), 1 (B) and 1 (C) are a plan view, a bottom view and a front view of the sliding bearing 1 according to the present embodiment, and FIG. It is AA arrow sectional drawing of the sliding bearing 1 shown to A). 2A is an enlarged view of the B portion of the sliding bearing 1 shown in FIG. 1D, and FIG. 2B is an enlarged view of the C portion of the sliding bearing 1 shown in FIG. 1D. is there.

  The slide bearing 1 according to the present embodiment includes an accommodation hole 10 for accommodating a shock absorber (not shown) of a suspension (for example, a strut type suspension) of a vehicle, and the rotation of the shock absorber accommodated in the accommodation hole 10 Support the load of the car body applied to the suspension while allowing movement.

  As shown, the slide bearing 1 is rotatably combined with the upper case 2 and the upper case 2 to form an annular space 5 between the upper case 2 and the lower case 3, and the annular space 5. An annular center plate 4 and a sliding sheet 8 disposed, and an annular dust seal 6 for sealing the annular space 5 to prevent foreign matter such as dust from entering the annular space 5, and not shown , And the lubricating grease with which the annular space 5 was filled.

  Upper case 2 is formed of synthetic resin such as polyacetal resin, polyamide resin, polybutylene terephthalate resin or the like, which is impregnated with lubricating oil if necessary to improve sliding characteristics, and in a state where the shock absorber of the suspension is inserted Mounted on an upper mount (not shown) which is a mounting mechanism of the suspension to the vehicle body.

  3 (A), 3 (B) and 3 (C) are a plan view, a bottom view and a front view of the upper case 2, and FIG. 3 (D) is an upper case shown in FIG. 3 (A). It is DD sectional drawing of 2. FIG.

  As shown, the upper case 2 is formed on an annular upper case main body 21 provided with an insertion hole 20 for inserting a shock absorber, and the upper surface 22 of the upper case main body 21, and the slide bearing 1 is attached to the upper mount And an annular recess 25 formed on the lower surface 24 of the upper case main body 21 facing the lower case 3 and rotatably combined with the lower case 3 to form an annular space 5 There is.

  A load transfer surface 27 that forms a ceiling of the annular space 5 is formed on the bottom surface 26 of the annular recess 25. The load transfer surface 27 transfers the load of the vehicle body applied to the suspension to the sliding sheet 8 and the center plate 4. A step surface 252 is formed on the inner peripheral side wall surface 251 of the annular recess 25.

  The lower case 3 is an insert molded product in which a steel plate 7 as a reinforcing material is embedded in a resin molded body using a synthetic resin such as polyacetal resin, polyamide resin, polybutylene terephthalate resin or the like, and a shock absorber of suspension is inserted. It is attached to the upper spring seat (not shown) which supports the upper end part of the coil spring (not shown) of the suspension in the fixed state.

  4 (A), 4 (B) and 4 (C) are a plan view, a bottom view and a front view of the lower case 3, and FIG. 4 (D) is a lower case shown in FIG. 4 (A). 3 is a cross-sectional view taken along line E-E of FIG.

  As illustrated, the lower case 3 is formed on a cylindrical lower case main body 31 provided with an insertion hole 30 for inserting a shock absorber, and an upper surface 32 of the lower case main body 31 opposed to the upper case 2 When the case 3 is rotatably combined with the upper case 2, the annular convex portion 33 is inserted into the annular recess 25 formed in the lower surface 24 of the upper case main body 21 of the upper case 2 to form the annular space 5. And a flange 35 protruding radially outward from the side surface 34 of the lower case main body 31.

  A mounting surface 331 for mounting the center plate 4 is formed on the upper surface (annular upper surface) 330 of the annular convex portion 33, and the mounting surface 331 is mounted on the outer peripheral side of the mounting surface 331. A plurality of detents 332 for preventing rotation of the placed center plate 4 is formed at equal intervals in the circumferential direction.

  The flange 35 projects radially outward from the side surface 34 on the outer peripheral side of the lower case main body 31 on the upper surface 32 side of the lower case main body 31, and the lower surface 350 of the flange 35 is attached to the upper spring seat.

  The dust seal 6 is a polyolefin resin elastomer, a polyamide resin elastomer, a polyester resin elastomer, a polystyrene resin elastomer, a polyurethane, to which a lubricant such as PTFE (polytetrafluoroethylene), lubricating oil or silicone is added as necessary. It is formed of a synthetic resin elastomer such as a resin elastomer, and is attached to the annular convex portion 33 of the lower case main body 31 of the lower case 3 by two-color molding or insert molding (see FIG. 4). As shown in FIGS. 2A and 2B, the dust seal 6 seals the gap between the outer peripheral side wall surface 333 of the annular convex portion 33 and the outer peripheral side wall surface 250 of the annular recess 25 of the upper case 2. And an inner seal portion 61 closing a gap between the inner peripheral side wall surface 334 of the annular convex portion 33 and the inner peripheral side wall surface 251 of the annular recess 25 of the upper case 2.

  The outer seal portion 60 has a cylindrical outer seal main body 601 joined to the outer peripheral side wall surface 333 of the annular convex portion 33, and radially outward from the outer seal main body 601 upward in the axial O direction (upper case 2 side) And an annular lip portion 602 that bends and contacts the bottom surface 26 of the annular recess 25 of the upper case 2.

  The inner seal portion 61 extends from the inner seal main body 611 joined to the inner circumferential side wall surface 334 of the annular convex portion 33 and from the inner seal main body 611 while being inclined radially inward in the axial O direction. And an annular lip portion 612 that contacts the step surface 252 formed on the inner peripheral side wall surface 251 of the annular recess 25 while bending.

  The center plate 4 is formed of a synthetic resin having excellent sliding characteristics such as a polyolefin resin or a polyamide resin to which a lubricant such as PTFE, lubricating oil, silicone or the like is added as necessary. The lower case main body 31 of the lower case 3 The sliding sheet 8 is fixed to the mounting surface 331 of the annular convex portion 33 provided on the sliding surface 8 and is in sliding contact with the sliding sheet 8 disposed between the center plate 4 and the load transmitting surface 27 of the annular recess 25 of the upper case 2. Thereby, while allowing rotation between upper case 2 and lower case 3, the load of the vehicle body applied to the suspension is supported via load transfer surface 27 of annular recess 25 of upper case 2 and sliding sheet 8 ( See Figure 2).

  5 (A), 5 (B) and 5 (C) are a plan view, a bottom view and a front view of the center plate 4, and FIG. 5 (D) is a center plate shown in FIG. 5 (A). 5 is a cross-sectional view taken along line F-F of FIG.

  As shown, the center plate 4 has an annular center plate main body 40, a thrust bearing surface 42 formed on the upper surface 41 of the center plate main body 40, and an inner peripheral side of the lower surface 43 of the center plate main body 40 in the axis O direction. And a plurality of detents 45 formed at equal intervals in the circumferential direction and protruding radially outward from the lower surface 43 of the center plate main body 40. .

  The thrust bearing surface 42 is in sliding contact with the sliding sheet 8 while supporting a load in the thrust direction applied via the load transfer surface 27 of the annular recess 25 of the upper case 2 and the sliding sheet 8. On the thrust bearing surface 42, a lubricating grease groove 46 for holding lubricating grease is annularly formed along the circumferential direction.

  The annular rib 44 contacts the lower surface 43 of the center plate main body 40 and the mounting surface 331 of the annular convex portion 33 provided on the lower case main body 31 of the lower case 3 so that the center plate 4 is on the lower case 3. When it is placed on the inner side of the annular convex portion 33. On the inner circumferential surface 47 of the annular rib 44, a radial bearing surface 48 in sliding contact with the inner circumferential side wall surface 251 of the annular recess 25 of the upper case 2 is formed while supporting the load in the radial direction applied via the upper case 2. ing.

  The center plate 4 is mounted on the lower case 3 such that the lower surface 43 of the center plate main body 40 and the mounting surface 331 of the annular convex portion 33 provided on the lower case main body 31 of the lower case 3 contact each other. The center plate 4 is rotated relative to the lower case 3 by circumferentially engaging with the gap 335 between the detents 332 provided on the annular convex portion 33 when placed on the To prevent

  The sliding sheet 8 is a sliding member disposed between the thrust bearing surface 42 of the center plate 4 and the load transmission surface 27 of the upper case 2 in the annular space 5. The sliding sheet 8 is made of a synthetic resin such as a fluorine resin such as modified PTFE obtained by copolymerizing other raw materials (comonomers) in a small amount with PTFE or TFE (tetrafluoroethylene), a polyacetal resin, a polyethylene resin, a polyamide resin, or a polyphenylene sulfide resin. The sliding properties are improved by adding a lubricant such as PTFE (but excluding the case where the thermoplastic plastic is PTFE or modified PTFE), lubricating oil, silicone, graphite or the like, if necessary. In addition, reinforcing materials such as aramid fibers, glass fibers and carbon fibers are added as necessary to improve the strength. Alternatively, the sliding sheet 8 may be formed of a metal excellent in sliding characteristics, such as a brass alloy.

  FIG. 6A is a plan view of the sliding sheet 8, and FIG. 6B is a G-G cross-sectional view of the sliding sheet 8 shown in FIG.

  As illustrated, the sliding sheet 8 is an annular body having a flat cross section in the direction of the axis O and is in contact with the contact surface 80 in contact with the load transfer surface 27 of the annular recess 25 of the upper case 2 A sliding surface 81 is provided opposite to the surface 80 and in sliding contact with the thrust bearing surface 42 of the center plate 4. The sliding surface 81 of the sliding sheet 8 comes into sliding contact with the thrust bearing surface 42 of the center plate 44, thereby enabling free rotation between the upper case 2 and the lower case 3.

  In the slide bearing 1 according to the present embodiment having the above configuration, the center plate 4 is fixed to the mounting surface 331 of the annular convex portion 33 formed on the upper surface 32 of the lower case main body 31 of the lower case 3 The fourth thrust bearing surface 42 is in sliding contact with the sliding surface 81 of the sliding sheet 8 disposed between the thrust bearing surface 42 and the load transfer surface 27 of the upper case 2. For this reason, the center plate 4 supports the load of the vehicle body applied to the suspension transmitted to the upper case 4 via the upper mount while allowing rotation between the upper case 2 and the lower case 3.

  Heretofore, an embodiment of the present invention has been described.

  In the present embodiment, the lip portion 602 of the outer seal portion 60 of the dust seal 6 extends upward from the annular convex portion 33 side of the lower case 2 in the axial O direction to abut on the bottom surface 26 of the annular recess 25 of the upper case 2. Since the gap connected to the annular space 5 is closed, the lip portion 602 of the outer seal portion 60 is required more than necessary for the gap between the bottom surface 26 of the annular recess 25 of the upper case 2 and the annular projection 33 of the lower case 3 Even if the slide bearing 1 is not formed long, a load in the thrust direction is applied to the slide bearing 1, whereby the lip portion 61 of the outer seal portion 60 reliably abuts on the bottom surface 26 of the annular recess 25 of the upper case 2. In addition, a step surface is formed on the inner circumferential side wall surface 251 of the annular recess 25 of the upper case 2 by extending the lip portion 612 of the inner seal portion 61 of the dust seal 6 upward in the axial O direction from the annular convex portion 33 side of the lower case 2 Since the gap leading to the annular space 5 is closed by contacting with the annular space 5, the step surface 252 formed on the inner peripheral side wall surface 251 of the annular recess 25 of the upper case 2 and the annular convex portion 33 of the lower case 3 Even if the lip portion 612 of the inner seal portion 61 is not formed longer than necessary with respect to the gap, a load in the thrust direction is applied to the slide bearing 1 to make the lip portion 612 of the inner seal portion 61 the upper case 2 It reliably abuts against the step surface 252 formed on the inner peripheral side wall surface 251 of the annular recess 25.

  For this reason, when combining the upper case 2 with the lower case 3 to which the dust seal 6 is attached, a large force is unnecessary, and the workability of assembling the slide bearing 1 is improved. Further, the increase in the pressure contact force of the lip portions 602 and 612 of the dust seal 6 with respect to the bottom surface 26 and the step surface 252 of the annular recess 25 of the upper case 2 is suppressed, and smooth rotation between the upper case 2 and lower case 3 is hindered. Can be prevented. Furthermore, even when the lip portions 602 and 612 of the dust seal 6 wear due to sliding with the bottom surface 26 of the annular recess 25 of the upper case 2, a load in the thrust direction is applied to the slide bearing 1, whereby the lip portion of the dust seal 6 is Since it can be made to abut the bottom surface 26 and the step surface 252 of the annular recess 25 of the upper case 2 with certainty, and the sealing performance is not deteriorated, the difference between the annular recess 25 of the upper case 2 and the dust seal 6 is small. Thus, the pivotability between the upper case 2 and the lower case 3 can be improved.

  In addition, since it is sufficient if the lip portion 602 can be elastically deformed in the direction of the axis O, the gap between the outer peripheral side wall surface 251 of the annular recess 25 of the upper case 2 and the outer peripheral surface 333 of the annular convex portion 33 of the lower case 3 is large The radial size of the slide bearing 1 can be reduced accordingly.

  Furthermore, when forming the dust seal 6 with the upper and lower molds relatively moved in the direction of the axis O of the dust seal 6, the lip portions 602 and 612 extend in the same direction as the movement direction of the upper and lower molds. It is possible to stabilize the performance of the dust seal 6 by suppressing the deformation of the lip portions 602 and 612 which occur when the dust seal 6 is pulled out.

  Therefore, according to the present embodiment, it is possible to provide the slide bearing 1 which is excellent in assembling workability, can be miniaturized, and is excellent in sliding performance while having the dust seal 6.

  The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the invention.

  For example, in the above embodiment, the lip portion 602 of the outer seal portion 60 of the dust seal 6 may be duplicated.

  FIG. 7 is a figure for demonstrating the modification 1A of the slide bearing 1 which concerns on one embodiment of this invention, and is a figure corresponded to the elements on larger scale of FIG. 2 (B).

  The difference between the modified example 1A and the slide bearing 1 according to the present embodiment is that an annular lip portion 603 is added to the outer seal portion 60 of the dust seal 6. The lip portion 603 extends radially inward from the outer seal main body 601 upward in the axial O direction, and contacts the bottom surface 26 of the annular recess 25 of the upper case 2 while bending. By providing the double lip portions 602 and 603 in the outer seal portion 60, the sealing performance of the dust seal 6 is improved, and foreign matter can be more reliably prevented from entering the annular space 5.

  Further, although the center plate 4 is separate from the lower case 3 in the above embodiment, the center plate 4 may be integrally formed with the lower case 3 by two-color molding or insert molding. In this case, the center plate 4 and the dust seal 6 may be integrated by using the same material for the center plate 4 and the dust seal 6.

  In the above embodiment, in the center plate 4, the annular rib 44 having the radial bearing surface 48 formed on the inner circumferential surface 47 is arranged along the direction of the axis O from the inner peripheral side of the lower surface 43 of the center plate main body 40. Although it is formed to project downward, the present invention is not limited thereto. The annular rib 44 may be a separate part from the center plate 4. Alternatively, the annular rib 44 may be omitted.

  Further, in the above embodiment, the thrust bearing surface 42 is provided on the upper surface 41 of the center plate 4, and between the thrust bearing surface 42 of the center plate 4 and the load transmission surface 27 of the upper case 2 in the annular space 5. Although the sliding sheet 8 is disposed, the present invention is not limited thereto. The thrust bearing surface 42 may be provided on the lower surface 43 of the center plate 4, and the sliding sheet 8 may be disposed between the thrust bearing surface 42 of the center plate 4 and the mounting surface 331 of the lower case 3. In this case, in order to enable rotation between the lower case 3 and the center plate 4, the rotation stop 332 and the rotation stop 45 are omitted from the lower case 3 and the center plate 4. Alternatively, the sliding sheet 8 may be omitted, and the thrust bearing surface 42 of the center plate 4 may be in direct sliding contact with the load transfer surface 27 of the upper case 2 or the mounting surface 331 of the lower case 3. In the case where the thrust bearing surface 42 of the center plate 4 is in direct sliding contact with the mounting surface 331 of the lower case 3 as well, the lower case 3 and the center plate can be rotated to enable rotation between the lower case 3 and the center plate 4. Stop 4 to stop 332 and stop 45 are omitted.

  In the above embodiment, the annular convex portion 33 is provided on the upper surface 32 of the lower case main body 31 of the lower case 3, and the annular convex portion 33 is formed on the lower surface 24 of the upper case main body 21 of the upper case 2. Although the annular space 5 is formed by being inserted into the recess 25, the present invention is not limited to this. It is sufficient that the annular space 5 is formed by facing the bottom surface 26 of the annular recess 25 formed in the lower surface 24 of the upper case main body 21 of the upper case 2 so that the annular upper surface of the lower case main body 31 of the lower case 3 faces.

  FIG. 8 is a view for explaining a modification 1B of the slide bearing 1 according to one embodiment of the present invention, and is a view corresponding to a partially enlarged view of FIG. 2 (B).

  As shown, this modified example 1B differs from the slide bearing 1 according to the present embodiment in that the lower case 3a, the center plate 4a and the dust seal 6a are used instead of the lower case 3, the center plate 4 and the dust seal 6. Was used.

  The lower case 3a has a cylindrical lower case main body 31 and an annular upper surface 36 facing the bottom surface 26 of the annular recess 25 formed in the lower surface 24 of the upper case main body 21 of the upper case 2 to form an annular space 5 And a flange 35 projecting radially outward from the side surface of the lower case main body 31, and an annular groove 37 formed on the annular upper surface 36 for receiving the center plate 4a.

  The center plate 4a is an annular body that can be accommodated in an annular groove 37 formed in the annular upper surface 36 of the lower case 3a, and is formed on the thrust bearing surface 42 and the thrust bearing surface 42 slidingly in contact with the sliding sheet 8 And an annular lubricating grease groove 46 for holding the grease.

  The dust seal 6a includes an outer seal portion 60 closing a gap between the side surface of the flange 35 of the lower case 3a and the outer peripheral side wall surface 250 of the annular recess 25 of the upper case 2. The outer seal portion 60 is a flange of the lower case 3a. A cylindrical outer seal main body 601 joined to the side surface of 35, and extending radially outward from the outer seal main body 601 in the axial O direction upward (upper case 2 side), extends in an annular shape of the upper case 2 And an annular lip portion 602 that comes in contact with the bottom surface 26 of the recess 25 while bending.

  The lower case 3a, the center plate 4a and the dust seal 6a are made of the same material as the lower case 3, the center plate 4 and the dust seal 6, respectively.

  In the above embodiment, the steel plate 7 as the reinforcing material is embedded in the lower case 3 by insert molding, but the steel plate 7 may be omitted.

  The present invention is broadly applicable to load bearing sliding bearings in a variety of mechanisms, including vehicle suspensions.

  1, 1A, 1B: Sliding bearing 2: upper case 3, 3a: lower case 4, 4a: center plate 5: annular space 6, 6a: dust seal 7: steel plate 8: sliding sheet 10: accommodation hole for sliding bearing 1 20: insertion hole of upper case 2 21: upper case main body 22: upper surface of upper case main body 23: mounting surface of upper case main body 21: lower surface of upper case main body 25: annular recess of upper case main body 26: annular Bottom surface of recess 25: Load transfer surface of upper case 2 30: Insertion hole of lower case 3 31: Lower case main body 32: upper surface of lower case main body 33: annular convex portion of lower case main body 34: lower case main body 31 Side 35: Lower Case Body 31 flange 36: annular upper surface 37: annular groove 40: center plate main body 41: upper surface of center plate main body 40: thrust bearing surface 43: lower surface of center plate main body 44: annular rib 45: rotation stop of center plate main body 40 46: lubricating grease groove of thrust bearing surface 42: inner circumferential surface of annular rib 44: radial bearing surface 60: outer seal portion of dust seal 6: inner seal portion of dust seal 6: contact surface of sliding sheet 8 A sliding surface 250 of the sliding sheet 8: an outer peripheral side wall surface 251 of the annular recess 25: an inner peripheral side wall surface 252 of the annular recess 25: a step surface of the inner peripheral side wall surface 330: an upper surface 331 of the annular convex portion 331: an annular convex Mounting surface 332 of portion 33: Stop of annular convex portion 33 333: Annular convex Outer peripheral side wall surface 334 of the portion 33: inner peripheral side wall surface 335 of the annular convex portion 33: gap between the rotation stop 332 350: lower surface of flange 35 601: outer seal main body 602, 603: lip portion of outer seal portion 60: inner side Seal body 612: lip portion of the inner seal portion 61

Claims (4)

A slide bearing for supporting a load,
An upper case having an annular recess on the lower surface;
A lower case having an annular upper surface facing the bottom of the annular recess of the upper case to form an annular space;
A center plate disposed in the annular space to realize relative rotation between the upper case and the lower case;
And a dust seal for closing the gap connected to the annular space,
The dust seal is
And a lip portion extending axially upward from the annular upper surface of the lower case and in contact with the bottom surface of the annular recess of the upper case. The sliding bearing according to claim 1, wherein
The slide bearing, wherein the dust seal is integrally formed with the lower case. The sliding bearing according to claim 1 or 2, wherein
A slide bearing comprising an annular sliding sheet disposed between the center plate and the bottom surface of the annular recess of the upper case or the annular upper surface of the lower case. The plain bearing according to any one of claims 1 to 3, wherein
The slide bearing supports the load applied to the shaft member while allowing rotation of the shaft member,
The upper case is attached to the support target of the shaft member with the shaft member inserted.
The lower case is combined with the upper case with the shaft member inserted,
The said center plate is arrange | positioned in the said annular space in the state in which the said shaft member was inserted, and implement | achieves relative rotation between the said upper case and the said lower case.

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