JP2019124290A - Slide bearing - Google Patents

Abstract

To provide a slide bearing which can prevent entry of foreign objects and leakage of lubrication grease to maintain slide performance over a long time.SOLUTION: A dust seal 6 closes a gap leading to an annular space 5 formed by an annular protruding part 33 of a lower case 3 being inserted into an annular recessed part 25 of an upper case 2 and is provided with: a first lip part 602 and a second lip part 603 which extend from the annular protruding part 33 side of the lower case 3 and contact with the annular recessed part 25 of the upper case 2. The first lip part 602 is set so that an angle α formed between a direction in which the first lip part 602 extends and a foreign object entry path becomes a narrow angle, and the second lip part 603 is set so that an angle β formed between a direction in which the second lip part 603 extends and a lubrication grease moving path Sout becomes a narrow angle.SELECTED DRAWING: Figure 7

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 A dust seal for closing the gap and a lubricating grease filled in the annular space are provided.

  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.

  In the slide bearing described in Patent Document 1, the lip portion of the dust seal is inclined downward (lower case side) radially outward from the outer peripheral surface side of the annular convex portion of the lower case. Therefore, the angle between the foreign matter intrusion direction from the outside toward the annular space and the extending direction of the lip portion of the dust seal is a narrow angle through the gap between the annular concave portion of the upper case and the annular convex portion of the lower case. Since a large reaction force can be generated with respect to the force in the foreign material intrusion direction and the sealing performance can be maintained, it is possible to effectively prevent the foreign material from entering the annular space.

Unexamined-Japanese-Patent No. 2017-44226

  Incidentally, in the slide bearing described in Patent Document 1, when a load in the thrust direction is applied, the lubricating grease in the annular space is pressed, and the annular convex portion of the lower case and the upper case connected to the annular space from the annular space. Move to the gap with the annular recess. However, the angle between the moving direction of the lubricating grease from the annular space to the outside through the gap between the annular recess of the upper case and the annular convex portion of the lower case and the extending direction of the lip of the dust seal is wide angle. In this case, only a small reaction force can be generated against the force in the direction of movement of the lubricating grease, and sealing performance can not be maintained. For this reason, the leakage to the outside of the lubricating grease filled in the annular space can not be effectively prevented, and there is a possibility that the sliding performance can not be maintained for a long time.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a slide bearing capable of maintaining sliding performance over a long period of time by preventing entry of foreign matter and leakage of lubricating grease. It is in.

  In order to solve the above problems, according to the present invention, the dust seal for closing the gap connected to the annular space formed by facing the bottom surface of the annular recess of the upper case and the annular upper surface of the lower case extends from the annular upper surface side of the lower case The first lip and the second lip are in contact with the annular recess of the upper case. Then, the first lip portion is set so that the angle between the extending direction of the first lip portion and the foreign matter intrusion path is a narrow angle, and the angle between the extending direction of the second lip portion and the lubricating grease moving path is The second lip portion is set to have a narrow angle.

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,
Lubricating grease is filled in the annular space;
The dust seal is
It has a first lip portion and a second lip portion extending from the annular upper surface side of the lower case and in contact with the annular recess of the upper case,
The first lip portion is
The angle between the direction in which the first lip extends and the foreign material intrusion direction toward the annular space from the outside via the gap between the annular recess of the upper case and the annular upper surface of the lower case is a narrow angle. Is set as
The second lip portion is
The angle between the extending direction of the second lip and the moving direction of the lubricating grease from the annular space to the outside through the gap between the annular recess of the upper case and the annular upper surface of the lower case is a narrow angle. Is set as.

  In the present invention, the dust seal for closing the gap connected to the annular space is provided with the first lip and the second lip extending from the annular upper surface side of the lower case and coming into contact with the annular recess of the upper case. And since the first lip portion is set so that the angle between the extension direction of the first lip and the foreign matter intrusion direction is a narrow angle, the first lip portion is against the force in the foreign material intrusion direction. A force can be generated to maintain the sealability, whereby foreign matter can be effectively prevented from entering the annular space. Also, since the second lip portion is set so that the angle between the extending direction of the second lip and the lubricating grease moving direction is a narrow angle, the second lip portion is against the force in the lubricating grease moving direction. A large reaction force can be generated to maintain the sealability, and the leakage of the lubricating grease filled in the annular space can be effectively prevented. Therefore, according to the present invention, it is possible to provide a sliding bearing capable of maintaining the sliding performance over a long period of time by preventing the entry of foreign matter and the leakage of lubricating grease.

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 function of the slide bearing 1 based on one embodiment of this invention, and is the elements on larger scale of FIG. 2 (B). FIG. 8 is a figure for demonstrating the modification 1A of the sliding bearing 1 which concerns on one embodiment of this invention, and is a figure corresponded in FIG. FIG. 9 is a figure for demonstrating the modification 1 B of the sliding bearing 1 which concerns on one embodiment of this invention, and is a figure corresponded in FIG. FIG. 10 is a figure for demonstrating the modification 1C of the sliding bearing 1 which concerns on one embodiment of this invention, and is a figure corresponded in FIG. FIG. 11 is a view for explaining a modification 1D of the slide bearing 1 according to the embodiment of the present invention, and is a view corresponding to FIG. FIG. 12 is a figure for demonstrating the modification 1 E of the sliding bearing 1 which concerns on one embodiment of this invention, and is a figure corresponded in FIG. FIG. 13 is a figure for demonstrating the modification 1F of the sliding bearing 1 which concerns on one embodiment of this invention, and is a figure corresponded in FIG.

  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 downward in the direction of the axis O (flange 35 side). An annular first lip portion 602 extending while inclining and bending and contacting with the outer peripheral side wall surface 250 of the annular recess 25 of the upper case 2, and from the outer seal main body 601 toward the axial O direction upper side (upper case 2 side) And an annular second lip portion 603 that extends while inclining radially inward and contacts the bottom surface 26 of the annular recess 25 of the upper case 2 while bending.

  The inner seal portion 61 extends from the cylindrical inner seal main body 611 joined to the inner peripheral side wall surface 334 of the annular convex portion 33 and from the inner seal main body 611 while inclining upward in the direction of the axis O toward the radially inward 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 outer seal portion 60 of the dust seal 6 is provided with an annular first lip portion 602 and a second lip portion 603, respectively. Here, the first lip portion 602 extends from the outer seal main body 601 radially outwardly downward while being inclined downward in the direction of the axis O, and contacts the outer peripheral side wall surface 250 of the annular recess 25 of the upper case 2 while bending. ing. For this reason, as shown in FIG. 7, through the gap between the extending direction of the first lip portion 602 and the outer peripheral surface 333 of the annular convex portion 33 of the lower case 3 and the outer peripheral side wall 250 of the annular recess 25 of the upper case 2. The first lip portion 602 is larger than the force in the foreign material intrusion direction Sin because the angle α with the foreign material intrusion direction Sin from the outside toward the annular space 5 is a narrow angle (preferably 10.degree. To 45.degree.). It is possible to generate a reaction force to maintain the sealing performance, thereby effectively preventing foreign matter from entering the annular space 5.

  The second lip portion 603 extends radially inward from the outer seal main body 601 upward in the direction of the axis O, and bends and contacts the bottom surface 26 of the annular recess 25 of the upper case 2. Therefore, as shown in FIG. 7, the gap between the extending direction of the second lip 603 and the outer peripheral surface 333 of the annular convex portion 33 of the lower case 3 and the outer peripheral side wall 250 of the annular recess 25 of the upper case 2. Since the angle β with the lubricating grease moving direction Sout directed from the annular space 5 to the outside is a narrow angle (preferably 50.degree. To 80.degree.), The second lip portion 603 is against the force in the lubricating grease moving direction Sout. Thus, a large reaction force can be generated to maintain the sealability, and the leakage of the lubricating grease filled in the annular space 5 can be effectively prevented.

  Therefore, according to the present embodiment, it is possible to prevent the entry of foreign matter and the leakage of lubricating grease and maintain the sliding performance for a long time.

  Here, in the outer seal portion 60 of the dust seal 6, the mesh of the second lip portion 603 and the annular recess 25 of the upper case 2 is made smaller than the mesh of the first lip portion 602 and the annular recess 25 of the upper case 2. Is preferred. By reducing the distance between the second lip portion 603 and the annular recess 25 of the upper case 2, the torque increase due to the contact between the dust seal 6 and the annular recess 25 of the upper case 2 is suppressed to suppress the upper case 2 and the lower case 3. It is possible to improve the pivotability between them. Even if the lubricating grease filled in the annular space 5 slightly leaks from the second lip portion 603 by reducing the distance between the second lip portion 603 and the annular recess 25 of the upper case 2, the first lip Since the portion 602 seals the leaked lubricating grease, the lubricating grease can be more reliably prevented from leaking to the outside.

  Further, in the present embodiment, an annular lip portion 612 is provided on the inner seal portion 61 of the dust seal 6. Here, the lip portion 612 extends from the inner seal main body 611 while inclining upward in the direction of the axis O toward the radially inward direction and bending to the step surface 252 formed on the inner peripheral side wall surface 251 of the annular recess 25. It is in contact. For this reason, as shown in FIG. 7, through the gap between the extending direction of the lip portion 612 and the inner peripheral surface 334 of the annular convex portion 33 of the lower case 3 and the inner peripheral side wall surface 251 of the annular recess 25 of the upper case 2. The lip portion 612 has a large angle with respect to the force in the lubricating grease moving direction Rout because the angle .gamma. With the lubricating grease moving direction Rout from the annular space 5 to the outside is a narrow angle (preferably 10.degree. To 45.degree.). A reaction force can be generated to maintain the sealability, and the leakage of the lubricating grease filled in the annular space 5 can be more effectively prevented.

  In addition, the lip portion 612 is externally provided through the gap between the extending direction of the lip portion 612 and the inner peripheral surface 334 of the annular convex portion 33 of the lower case 3 and the inner peripheral side wall surface 251 of the annular concave portion 25 of the upper case 2. The angle σ formed with the foreign material intrusion direction Rin toward the annular space 5 is wide-angle (for example, 135 degrees to 170 degrees), but the step surface 252 is formed on the inner peripheral side wall surface 251 of the annular recess 25 at the tip of the lip portion 612. The lip portion 612 can generate a large reaction force against the force in the foreign material intrusion direction Rin to maintain the sealing property, thereby further invading foreign material into the annular space 5. It can be effectively prevented.

  Further, in the present embodiment, since the lubricating grease groove 46 is formed in the thrust bearing surface 42 of the center plate 4, more lubricating grease can be held on the thrust bearing surface 42. Therefore, the thrust bearing surface 42 can be covered with a lubricating grease film, and the sliding performance can be maintained for a longer period of time.

  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, in the outer seal portion 60 of the dust seal 6, the first lip portion 602 is extended while being inclined downward in the direction of the axis O radially outward from the outer seal main body 601. And the second lip portion 603 extends radially inward from the outer seal main body 601 upward in the direction of the axis O. The bottom surface 26 of the annular recess 25 is in contact while being bent. However, the present invention is not limited to this. The first lip portion 602 may be set so that an angle α between the extension direction of the first lip portion 602 and the foreign matter intrusion direction Sin is a narrow angle, and the second lip portion 603 is a second lip portion. An angle β between the extending direction of the second lip portion 603 and the lubricating grease moving direction Sout may be set to be a narrow angle.

  FIG. 8 is a figure for demonstrating the modification 1A of the slide bearing 1 which concerns on this Embodiment, and is a figure corresponded in FIG.

  The difference between the modified example 1A and the slide bearing 1 according to the present embodiment is that a second lip 603 a is provided in the outer seal 60 of the dust seal 6 instead of the second lip 603. The second lip portion 603 a extends radially outward from the outer seal main body 601 and inclines upward in the direction of the axis O, and contacts the outer peripheral side wall surface 250 of the annular recess 25 of the upper case 2 while bending. Even in this case, from the annular space 5 via the gap between the extending direction of the second lip portion 603a and the outer peripheral surface 333 of the annular convex portion 33 of the lower case 3 and the outer peripheral side wall surface 250 of the annular recess 25 of the upper case 2 The second lip portion 603a generates a large reaction force with respect to the force in the lubricating grease moving direction Sout because the angle β formed with the lubricating grease moving direction Sout toward the end becomes a narrow angle (preferably 10 degrees to 45 degrees). The sealability can be maintained by

  FIG. 9 is a figure for demonstrating the modification 1B of the slide bearing 1 which concerns on this Embodiment, and is a figure corresponded in FIG.

  The difference between the modified example 1B and the slide bearing 1 according to the present embodiment is that a first lip portion 602 a is provided in the outer seal portion 60 of the dust seal 6 instead of the first lip portion 602. The first lip portion 602 a extends radially outward 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. Even in this case, the annular space 5 from the outside via the gap between the extending direction of the first lip portion 602 a and the outer peripheral surface 333 of the annular convex portion 33 of the lower case 3 and the outer peripheral side wall surface 250 of the annular recess 25 of the upper case 2. The first lip portion 602a generates a large reaction force against the force in the foreign material intrusion direction Sin because the angle α with the foreign material intrusion direction Sin toward the end becomes a narrow angle (50 to 80 degrees is preferable). , Sealability can be maintained.

  Further, in the above embodiment, as with the first lip portion 602 and the second lip portion 603 of the outer seal portion 60 of the dust seal 6, the inner seal portion 61 of the dust seal 6 may have dual lip portions.

  FIG. 10 is a view for explaining a modification 1C of the slide bearing 1 according to the present embodiment, and is a view corresponding to FIG.

  The difference between the modified example 1C and the slide bearing 1 according to the present embodiment is that an inner seal portion 61 a is provided instead of the inner seal portion 61 of the dust seal 6. Further, the inner seal portion 61 a is different from the inner seal portion 61 in that first and second annular lip portions 613 and 614 are provided instead of the annular lip portion 612. The first lip portion 613 extends from the inner seal main body 611 inward in the radial direction and inclined downward in the direction of the axis O, and is in contact with the inner circumferential side wall surface 251 of the annular recess 25 in a bending manner. Further, the second lip portion 614 extends from the inner seal main body 611 radially inward and inclined upward in the direction of the axis O, and contacts the inner circumferential side wall surface 251 of the annular recess 25 while bending.

  In this modification 1C, the direction of extension of the first lip portion 613 and the gap between the inner circumferential surface 334 of the annular convex portion 33 of the lower case 3 and the inner circumferential sidewall surface 251 of the annular concave portion 25 of the upper case 2 The first lip portion 613 is a large reaction force with respect to the force in the foreign material intrusion direction Rin since the angle σ formed with the foreign material intrusion direction Rin toward the annular space 5 is a narrow angle (preferably 10 degrees to 45 degrees). Can be generated to maintain sealability. In addition, the direction from the annular space 5 through the gap between the extending direction of the second lip portion 614 and the inner circumferential surface 334 of the annular convex portion 33 of the lower case 3 and the inner circumferential sidewall surface 251 of the annular recess 25 of the upper case 2 The second lip portion 614 generates a large reaction force with respect to the force in the lubricating grease moving direction Rout because the angle γ with the lubricating grease moving direction Rout toward the end becomes a narrow angle (preferably 50 to 80 degrees). The sealability can be maintained by

  FIG. 11 is a view for explaining a modification 1D of the slide bearing 1 according to the present embodiment, and is a view corresponding to FIG. 7.

  The difference of this modification 1D from the slide bearing 1 according to the present embodiment is that an inner seal portion 61 b is provided in place of the inner seal portion 61 of the dust seal 6. Further, the inner seal portion 61 b is different from the inner seal portion 61 in that an annular first lip portion 613 a and a second lip portion 614 a are provided instead of the annular lip portion 612. The first lip portion 613 extends radially inward from the inner seal main body 611 toward the upper side in the direction of the axis O, and contacts the step surface 252 of the inner peripheral side wall surface 251 of the annular recess 25 while bending. . Further, the second lip portion 614a extends radially outward from the inner seal main body 611 toward the upper side in the direction of the axis O, and contacts the step surface 252 of the inner peripheral side wall surface 251 of the annular recess 25 while bending. ing.

  In this modification 1D as well, the space between the extending direction of the first lip portion 613a and the inner peripheral surface 334 of the annular convex portion 33 of the lower case 3 and the inner peripheral side wall surface 251 of the annular recess 25 of the upper case 2 The first lip portion 613a has a large reaction force with respect to the force in the foreign material intrusion direction Rin since the angle .sigma. With the foreign material intrusion direction Rin toward the annular space 5 is a narrow angle (preferably 50.degree. To 80.degree.). Can be generated to maintain sealability. Further, from the annular space 5 through the gap between the extending direction of the second lip portion 614a and the inner circumferential surface 334 of the annular convex portion 33 of the lower case 3 and the inner circumferential side wall surface 251 of the annular recess 25 of the upper case 2 The second lip portion 614a generates a large reaction force with respect to the force in the lubricating grease moving direction Rout because the angle γ formed with the lubricating grease moving direction Rout toward the end becomes a narrow angle (50 to 80 degrees is preferable). The sealability can be maintained by

  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 330 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 330 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 330 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. 12 is a figure for demonstrating the modification 1 E of the sliding bearing 1 which concerns on this Embodiment, and is a figure corresponded in FIG.

  As shown, this modification 1E 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 An annular first lip portion 602 a that contacts the bottom surface 26 of the recess 25 while bending, and extends radially inward from the outer seal main body 601 upward in the axial O direction. And an annular second lip 603 that contacts the bottom surface 26 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.

  FIG. 13 is a figure for demonstrating the modification 1F of the sliding bearing 1 which concerns on this Embodiment, and is a figure corresponded in FIG.

  As shown, this modification 1F is different from the modification 1E of the slide bearing 1 shown in FIG. 12 in that a dust seal 6b is used instead of the dust seal 6a. The dust seal 6b 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 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 an outer peripheral side wall surface of the annular seal 25 of the upper case 2 extending while being inclined downward in the direction of the axis O from the outer seal main body 601 radially outward. An annular first lip portion 602 coming into contact while being bent to 250, and an outer peripheral side wall surface 250 of the outer seal main body 601 extending radially outward and inclined upward in the direction of the axis O And an annular second lip portion 603a that contacts while being bent. In addition, the material similar to dust seal 6 and 6a is used for dust seal 6b.

  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, 1C, 1D, 1F, 1F: Slide bearing 2: Upper case 3, 3a: Lower case 4, 4a: Center plate 5: Annular space 6, 6a, 6b: Dust seal 7: Steel plate 8: Slide Dynamic seat 10: Housing hole for sliding bearing 1 20: Insertion hole for upper case 2 21: Upper case main body 22: Upper surface of upper case main body 21: Mounting surface of upper case main body 21: Lower surface of upper case main body 25: Annular recess 26 of upper case main body 21: bottom surface of annular recess 25 27: 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: lower case main body 31 Annular convex part 34: lower case main body 31 Side 35: flange of lower case main body 31: 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: center Detent 46 of plate body 40: Lubricating grease groove 47 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: Sliding Contact surface 81 of the sheet 8: Slide surface of the slide sheet 250: Outer peripheral side wall surface 251 of the annular recess 25: Inner peripheral side wall surface 252 of the annular recess 25: Step difference surface of the inner peripheral side wall surface 330: Annular convex portion 33 Upper surface 331: Mounting surface of annular convex portion 33: annular convex 33 detents 333: outer peripheral side wall surface of annular convex portion 33 334: inner peripheral side wall surface of annular convex portion 33: gap between detents 332 350: lower surface of flange 35 601: outer seal main body 602, 602a: outer seal First lip portion 603, 603a of the portion 60: second lip portion of the outer seal portion 601: inner seal body 612: lip portion 613 of the inner seal portion 61, 613a: first lip portion of the inner seal portion 614, 614a : Second lip of inner seal 61

Claims (9)

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,
Lubricating grease is filled in the annular space;
The dust seal is
It has a first lip portion and a second lip portion extending from the annular upper surface side of the lower case and in contact with the annular recess of the upper case,
The first lip portion is
The angle between the direction in which the first lip extends and the foreign material intrusion direction toward the annular space from the outside via the gap between the annular recess of the upper case and the annular upper surface of the lower case is a narrow angle. Is set as
The second lip portion is
The angle between the extending direction of the second lip portion and the moving direction of the lubricating grease from the annular space to the outside through the gap between the annular recess of the upper case and the annular upper surface of the lower case is a narrow angle A sliding bearing characterized in that it is set to be. The sliding bearing according to claim 1, wherein
The first lip portion is
Extending radially outward from the outer peripheral side of the annular upper surface of the lower case while axially downwardly inclined, the outer case contacts the outer peripheral side wall surface of the annular recess of the upper case,
The second lip portion is
A slide bearing characterized by extending radially inward from the outer peripheral side of the annular upper surface of the lower case while inclining radially inward and abutting on the bottom surface of the annular recess of the upper case. The sliding bearing according to claim 1, wherein
The first lip portion is
Extending radially outward from the outer peripheral side of the annular upper surface of the lower case while axially downwardly inclined, the outer case contacts the outer peripheral side wall surface of the annular recess of the upper case,
The second lip portion is
A slide bearing, which extends radially outward from an outer peripheral side of the annular upper surface of the lower case and extends in an axially upward direction so as to abut on a side surface of the annular recess of the upper case. The sliding bearing according to claim 1, wherein
The first lip portion is
Extending radially outward from the outer peripheral side of the annular upper surface of the lower case in the axial direction upward and in contact with the bottom surface of the annular recess of the upper case,
The second lip portion is
A slide bearing characterized by extending radially inward from the outer peripheral side of the annular upper surface of the lower case while inclining radially inward and abutting on the bottom surface of the annular recess of the upper case. The sliding bearing according to claim 1, wherein
The first lip portion is
Extending radially downward inward from the inner peripheral side of the annular upper surface of the lower case while axially inclining downward and in contact with the inner peripheral side wall surface of the annular recess of the upper case,
The second lip portion is
A slide bearing characterized in that it extends radially inward from the inner peripheral side of the annular upper surface of the lower case while inclining upward in the axial direction while inclining to the inner peripheral side wall surface of the annular recess of the upper case. . The sliding bearing according to claim 1, wherein
The first lip portion is
Extending radially inward from the inner peripheral side of the annular upper surface of the lower case in the axial direction upward in the radial direction, and abut on a step surface formed on the inner peripheral side wall surface of the annular recess of the upper case;
The second lip portion is
Extending radially outward from the inner peripheral side of the annular upper surface of the lower case in the axial direction upward and in contact with the step surface formed on the inner peripheral side wall surface of the annular recess of the upper case A sliding bearing characterized by A sliding bearing according to any one of the preceding claims, wherein
The dust seal is
A slide bearing characterized in that it is integrally formed on the lower case. A sliding bearing according to any one of the preceding claims, 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. A sliding bearing according to any one of the preceding claims, 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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