JP5765413B2 - Thrust slide bearing made of synthetic resin - Google Patents

Description

  The present invention relates to a thrust sliding bearing made of synthetic resin.

  A strut suspension used for a front wheel of a four-wheeled vehicle generally has a structure in which a coil spring is combined with a strut assembly in which a hydraulic shock absorber is built in an outer cylinder integrated with a main shaft. In such suspension, when the strut assembly rotates together with the coil spring in the steering operation, there are a type in which the piston rod of the strut assembly rotates and a type in which the piston rod does not rotate. In order to allow smooth rotation of the strut assembly, a synthetic plastic thrust sliding bearing is used instead of the rolling bearing between the mounting mechanism of the strut assembly to the vehicle body and the upper spring seat member of the coil spring. There is a case.

JP 2010-53908 A JP 2010-31949 A JP 2009-257516 A

  An upper case made of synthetic resin, a lower case made of synthetic resin superimposed on the upper case so as to be rotatable around the axis of the upper case, and a synthetic placed between the upper case and the lower case In such a synthetic resin thrust slide bearing having a resin thrust slide bearing piece, the upper case and the lower case are prevented in order to prevent entry of dust, muddy water, etc. between the upper case and the lower case. Labyrinth means using gaps between the protrusions are provided on the inner peripheral side and the outer peripheral side.

  However, in such a labyrinth means, under severe conditions, there may be a case where a sufficient effect of preventing the entry of dust, muddy water, etc. may not be obtained. There is a possibility that the relative rotation of the lower case with respect to the upper case cannot be obtained, and abnormal noise is generated.

  The present invention has been made in view of the above points, and its object is to effectively prevent entry of dust, muddy water, etc. even under severe conditions, and abnormalities caused by the entry of dust, muddy water, etc. It is an object of the present invention to provide a thrust sliding bearing made of synthetic resin that can reduce the generation of sound.

  The thrust slide bearing made of synthetic resin of the present invention has an upper annular plate-like portion, an outer annular end formed integrally with the outer annular end portion of the upper annular plate-like portion, and depending on the outer annular end portion. An upper case made of a synthetic resin having an inner cylindrical portion that is integrally formed at the inner annular end of the cylindrical portion and the upper annular plate portion at the upper annular end and is suspended from the inner annular end, and the upper portion A cylinder which is superposed on the case so as to be rotatable around the axis of the upper case and is integrally formed on the lower annular plate-like portion and the annular upper surface of the lower annular plate-like portion, and stands upright from the annular upper surface. A lower case made of a synthetic resin having a portion and an annular lower surface of the upper annular plate-like portion arranged between the upper case and the lower case so as to be rotatable around the axis of the upper case on the annular upper surface Meanwhile, lower case An annular plate-like portion that is in contact with the annular upper surface of the cylindrical portion at the annular lower surface, and a cylindrical portion that is integrally formed at the inner annular end of the annular plate-like portion at the upper annular end and hangs down from the inner annular end. A synthetic plastic thrust sliding bearing piece, and an inner elastically deformable lip portion integrally formed on the cylindrical inner surface projecting obliquely upward and inward from the cylindrical inner surface on the outer surface of the cylindrical portion of the lower case On the other hand, it is in contact with the inner surface of the outer cylindrical portion of the upper case by an outer elastically deformable lip portion that projects obliquely downward and outward from the cylindrical outer surface and is integrally formed with the cylindrical outer surface. The outer elastic seal member is in contact with the inner surface of the cylindrical portion of the lower case by an outer elastically deformable lip portion that protrudes obliquely upward and outward from the cylindrical outer surface and is integrally formed with the cylindrical outer surface. Meanwhile, the inner cylindrical shape of the upper case And an inner elastic seal member that protrudes obliquely inwardly from the cylindrical inner surface and is in contact with an inner elastically deformable lip formed integrally with the cylindrical inner surface. The annular lower end surface of the outer cylindrical portion of the case faces the annular upper surface of the lower annular plate portion of the lower case with a gap, and the inner surface of the outer cylindrical portion of the upper case faces the lower surface of the upper annular plate portion. It has a frustoconical inner surface that is connected and is in contact with the outer elastically deformable lip portion of the outer elastic seal member, and the outer surface of the cylindrical portion of the lower case is elastically deformed inside the outer elastic seal member. A small-diameter cylindrical outer surface in contact with a free lip, a large-diameter cylindrical outer surface having a larger diameter than the small-diameter cylindrical outer surface, and an outer elastic seal disposed between the small-diameter cylindrical outer surface and the large-diameter cylindrical outer surface The annular lower surface of the member touched An outer surface of the inner cylindrical portion of the upper case is connected to the lower surface of the upper annular plate-like portion, and a large-diameter cylindrical outer surface connected to the lower-circular cylindrical outer surface. And a small-diameter cylindrical outer surface that is smaller in diameter than the large-diameter cylindrical outer surface and is in contact with an elastically deformable lip portion inside the inner elastic seal member, and the inner surface of the cylindrical portion of the lower case is A small-diameter cylindrical inner surface connected to the annular inner surface of the lower annular plate-like portion of the lower case, and a large-diameter cylindrical inner surface connected to the annular upper surface of the cylindrical portion of the lower case and having a larger diameter than the small-diameter cylindrical surface An intermediate cylindrical inner surface that is smaller in diameter than the small-diameter cylindrical inner surface and smaller in diameter than the large-diameter cylindrical inner surface and in contact with the elastically deformable lip portion on the outer side of the inner elastic seal member, and a small-diameter cylindrical shape Between the inner surface and the intermediate cylindrical inner surface It has a lower annular step surface that is in contact with the annular lower surface of the side elastic seal member, and an upper annular step surface disposed between the inner cylindrical inner surface and the large-diameter cylindrical inner surface. The annular lower end surface of the inner cylindrical portion of the upper case connected to the small-diameter cylindrical outer surface of the upper portion faces the lower annular step surface of the cylindrical portion of the lower case with a gap, and the cylindrical portion of the thrust slide bearing piece Is arranged between the large-diameter cylindrical outer surface of the outer cylindrical surface of the upper case and the large-diameter cylindrical inner surface of the inner surface of the cylindrical portion of the lower case.

  According to the thrust slide bearing made of the synthetic resin according to the present invention, the outer elastic seal member protrudes obliquely upward and inward from the cylindrical inner surface, and is formed on the inner cylindrical elastically deformable lip. The outer surface of the cylindrical portion of the lower case is in contact with the small-diameter cylindrical outer surface, while projecting obliquely downward outward from the cylindrical outer surface and integrally formed on the cylindrical outer surface. The lip is in contact with the frustoconical inner surface of the inner surface of the outer cylindrical portion of the upper case, and is further in contact with the annular stepped surface of the outer surface of the cylindrical portion of the lower case on its annular lower surface. The sealing member protrudes obliquely upward and outward from the cylindrical outer surface, and contacts the intermediate cylindrical inner surface of the inner surface of the cylindrical portion of the lower case with an outer elastically deformable lip formed integrally with the cylindrical inner surface. While cylindrical An inner elastically deformable lip portion that protrudes obliquely inwardly from the surface and is integrally formed with the cylindrical inner surface is in contact with a small-diameter cylindrical outer surface of the outer cylindrical surface of the upper case, and Because the annular lower surface is in contact with the lower annular stepped surface of the inner surface of the cylindrical portion of the lower case, even under severe conditions, the annular lower end surface of the outer cylindrical portion of the upper case and the lower annular plate of the lower case An upper annular plate through an annular gap between the annular upper surface of the annular portion and an annular gap between the annular lower end surface of the inner cylindrical portion of the upper case and the lower annular step surface of the cylindrical portion of the lower case Dust and muddy water can be effectively prevented from entering the annular space between the annular lower surface of the cylindrical portion and the annular upper surface of the cylindrical portion of the lower case and accommodating the annular plate-like portion of the thrust slide bearing piece. The occurrence of abnormal noise due to the intrusion of muddy water can be reduced.

  In the present invention, the inner surface of the outer cylindrical portion of the upper case is connected to the annular lower end of the frustoconical inner surface at the upper annular end and is annular to the annular inner edge of the annular lower end surface of the outer cylindrical portion of the upper case. Even if it has a cylindrical inner surface connected at the lower end, the inner surface of the outer cylindrical portion of the upper case is connected to the annular lower end of the frustoconical inner surface at the upper end of the large-diameter ring and the large-diameter circle An upper frustoconical surface having a small-diameter annular lower end smaller in diameter than the annular upper end, and a small-diameter annular upper end connected to the small-diameter annular lower end of the upper frustoconical surface and larger in diameter than the small-diameter annular upper end And a lower truncated conical surface having a large-diameter annular lower end.

  According to the present invention, each of the outer elastic seal member and the inner elastic seal member includes an elastic seal body having a corresponding lip part that can be elastically deformed, and a core bar embedded in the elastic seal body. Also good.

  In a preferred example, the lower case has a plurality of protrusions integrally formed on the annular upper surface of the cylindrical portion so as to be separated from each other in the direction around the axis, and is formed in an annular plate shape of the thrust slide bearing piece. The portion may have a plurality of recesses or notches for receiving each of the plurality of protrusions of the lower case, so that the thrust slide bearing piece can rotate with respect to the rotation about the axis. As a result, the upper case is rotatable with respect to the lower case around the axis of the upper case.

  In another preferred example, the annular lower surface of the outer elastic seal member has at least one elastically deformable annular projecting surface, and the annular lower surface of the inner elastic seal member has at least one elastically deformable annular projecting surface. And having such an elastically deformable annular projecting surface, the sealing performance on the annular lower surface of the outer elastic seal member and the annular lower surface of the inner elastic seal member is due to the elastic deformation of the annular projecting surface. And can more effectively prevent the entry of dust, muddy water, etc. into the annular space that accommodates the annular plate-like portion of the thrust slide bearing piece, and the generation of abnormal noise due to the entry of dust, muddy water, etc. can be reduced more preferably. .

  Further, in the present invention, the outer surface of the cylindrical portion of the lower case is connected to the annular upper surface of the cylindrical portion at the annular upper edge, and the small diameter cylindrical shape is in contact with the elastically deformable lip portion inside the outer elastic seal member. A small-diameter cylindrical outer surface having a radially projecting cylindrical outer surface larger in diameter than the outer surface and in contact with an elastically deformable lip portion on the inner side of the outer elastic seal member has a radially projecting cylindrical shape in the axial direction. The inner surface of the cylindrical portion of the lower case may be arranged between the outer surface and the annular stepped surface where the annular lower surface of the outer elastic seal member is in contact. An axial projecting annular step surface that is connected to the upper edge and is closer to the annular lower end surface of the inner cylindrical portion of the upper case in the axial direction than the lower annular step surface that is in contact with the annular lower surface of the inner elastic seal member The inner elastic sheath The lower annular step surface that is in contact with the annular lower surface of the steel member may be disposed between the axially projecting annular step surface and the intermediate cylindrical inner surface in the radial direction. When the outer surface and the axial projecting annular step surface are provided, the outer elastic seal member and the inner elastic seal member can be preferably positioned.

  The upper case and the lower case may be made of a synthetic resin including at least one of polyacetal resin, polyamide resin, thermoplastic polyester resin, polyolefin resin, polycarbonate resin, and fluororesin. It is preferable to be made of a synthetic resin including at least one of resin, polyamide resin, thermoplastic polyester resin, polyolefin resin, and fluororesin, and each of the upper case and the lower case is composed of a thrust sliding bearing piece. Synthetic resin similar to resin can be used, but especially synthetic resin with good friction characteristics and synthetic resin used for thrust sliding bearing piece is used, and for thrust sliding bearing piece and upper case and lower case A combination of polyacetal resin and polyamide resin So a combination of a polyolefin resin, particularly polyethylene resin and polyacetal resin, may be mentioned a combination of combinations and polyacetal resin and polyacetal resin with a polyacetal resin and a thermoplastic polyester resin, particularly polybutylene terephthalate resin.

  According to the present invention, it is possible to provide a thrust sliding bearing made of a synthetic resin that can effectively prevent entry of dust, muddy water, etc. under severe conditions, and can reduce the occurrence of abnormal noise due to the entry of dust, muddy water, etc. Can do.

FIG. 1 is an explanatory front sectional view of an example of an embodiment of the present invention. 2 is a cross-sectional explanatory view taken along the line II-II shown in FIG. 3 of the lower case shown in FIG. FIG. 3 is an explanatory plan view of the lower case shown in FIG. FIG. 4 is an enlarged front sectional explanatory view of the right part of the example shown in FIG. FIG. 5 is a left side enlarged front cross-sectional explanatory diagram of the example shown in FIG. FIG. 6 is an explanatory plan view of the thrust slide bearing piece shown in FIG. 7 is a cross-sectional explanatory view taken along the line VII-VII shown in FIG. 6 of the thrust slide bearing piece shown in FIG. FIG. 8 is a partial cross-sectional explanatory view of the outer elastic seal member shown in FIG. 1. FIG. 9 is a partial cross-sectional explanatory view of the inner elastic seal member shown in FIG. 1. FIG. 10 is a right side enlarged front cross-sectional explanatory view corresponding to FIG. 4 of another example of the embodiment of the present invention. 11 is a left side enlarged front sectional explanatory view corresponding to FIG. 5 of another example shown in FIG. 12 is an explanatory plan view of a lower case corresponding to FIG. 3 of another example shown in FIG.

  Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.

  1 to 9, a synthetic resin thrust sliding bearing 1 of this example is formed integrally with an upper annular plate portion 2 and an outer annular end portion 3 of the upper annular plate portion 2 with an upper annular end portion 4. The upper cylindrical end 5 is integrally formed with the outer cylindrical end portion 5 and the inner annular end portion 6 of the upper annular plate-like portion 2 and is suspended from the inner annular end portion 6. A synthetic resin upper case 12 having an annular protrusion 11 having a flat upper surface 10 formed integrally with the inner cylindrical portion 8 and the annular upper surface 9 of the upper annular plate-like portion 2; The upper case 12 is overlapped so as to be rotatable in the R direction around the axis O, and is formed integrally with the lower annular plate-like portion 15 and the annular upper surface 16 of the lower annular plate-like portion 15. Ring of cylindrical portion 17 and lower annular plate-like portion 15 erected from upper surface 16 An R direction that is integrally formed on the radially inner side of the lower surface 18 and that hangs down from the annular lower surface 18 and a radially outer edge portion of the annular upper surface 20 of the cylindrical portion 17 is a direction around the axis O. A lower case 22 made of synthetic resin having a plurality of protrusions 21 that are integrally spaced apart from each other, and disposed between the upper case 12 and the lower case 22 and of the upper annular plate-like portion 2. An annular plate that is in contact with the annular lower surface 25 at the annular upper surface 26 so as to be rotatable in the R direction around the axis O of the upper case 12, while being in contact with the annular upper surface 20 of the cylindrical portion 17 of the lower case 22 at the annular lower surface 27. Synthetic resin thrust slide bearings having a cylindrical portion 31 that is integrally formed with an inner annular end 29 of the annular portion 28 and the annular plate-like portion 28 at an upper annular end 30 and is suspended from the inner annular end 29. Piece 33 and below The outer surface 41 of the cylindrical portion 17 of the case 22 protrudes obliquely upward and inward from the cylindrical inner surface 42 and is in contact with an inner elastically deformable lip portion 43 formed integrally with the cylindrical inner surface 42. The outer cylindrical portion 5 of the upper case 12 is in contact with the inner surface 44 of the outer cylindrical portion 5 by an outer elastically deformable lip portion 46 that projects obliquely downward and outward from the cylindrical outer surface 45 and is integrally formed with the cylindrical outer surface 45. An outer elastic seal member 47, and an outer elastically deformable lip formed integrally with the cylindrical outer surface 49 so as to protrude obliquely upward and outward from the cylindrical outer surface 49 to the inner surface 48 of the cylindrical portion 17 of the lower case 22. While being in contact with the portion 50, the inner elastic deformation integrally formed with the cylindrical inner surface 52 protrudes obliquely inwardly from the cylindrical inner surface 52 to the outer surface 51 of the inner cylindrical portion 8 of the upper case 12. Free And an inner elastic seal member 54 in contact with the top portion 53.

  In the upper case 12, the annular lower end surface 61 of the outer cylindrical portion 5 faces the annular upper surface 16 of the lower annular plate-like portion 15 of the lower case 22 with an annular gap 62. The inner surface 44 is connected to the lower surface 25 of the upper annular plate-shaped portion 2 and has a frustoconical inner surface 65 in contact with the elastically deformable lip portion 46 on the outer side of the outer elastic seal member 47, and a frustoconical inner surface. A cylindrical inner surface 66 connected to the annular lower end of the annular lower end surface 61 and connected to the inner peripheral edge of the annular lower end surface 61 at the lower annular end. The outer surface 41 faces the large-diameter cylindrical outer surface 67 with a cylindrical gap 64, and the outer surface 51 of the inner cylindrical portion 8 is connected to the lower surface 25 of the upper annular plate-shaped portion 2. 69 and a large-diameter cylindrical outer surface 69 A smaller diameter than the large-diameter cylindrical outer surface 69 with being articulated inside the resiliently deformable lip portion 53 of the inner elastic seal member 54 is provided with a small diameter cylindrical outer surface 70 in contact.

  In the lower case 22, the outer surface 41 of the cylindrical portion 17 has a small-diameter cylindrical outer surface 75 in contact with the elastically deformable lip portion 43 inside the outer elastic seal member 47 and a larger diameter than the small-diameter cylindrical outer surface 75. A cylindrical outer surface 67, an annular stepped surface 76 disposed between the small cylindrical outer surface 75 and the large cylindrical outer surface 67 and in contact with the annular lower surface 68 of the outer elastic seal member 47; A radially projecting cylindrical outer surface 77 having a larger diameter than a small-diameter cylindrical outer surface 75 connected to the annular upper surface 20 of the portion 17 and in contact with the elastically deformable lip 43 on the inner side of the outer elastic seal member 47. The inner surface 48 of the cylindrical portion 17 has a small-diameter cylindrical inner surface 79 connected to the annular inner surface 78 of the lower annular plate-shaped portion 15 and a larger diameter than the small-diameter cylindrical surface 79 and the cylindrical portion 17. Annular top surface 2 A large-diameter cylindrical inner surface 80 that is connected to the inner diameter of the small-diameter cylindrical inner surface 79, and a small-diameter cylindrical inner surface 80 that is smaller in diameter than the large-diameter cylindrical inner surface 80 and that is elastically deformable outside the inner elastic seal member 54. An intermediate cylindrical inner surface 81 in contact with the portion 50, a lower annular step surface 83 disposed between the small-diameter cylindrical inner surface 79 and the intermediate cylindrical inner surface 81 and in contact with the annular lower surface 82 of the inner elastic seal member 54; An upper annular stepped surface 84 disposed between the intermediate cylindrical inner surface 81 and the large-diameter cylindrical inner surface 80, and an inner elastic seal connected to the annular upper edge of the small-diameter cylindrical inner surface 79 of the cylindrical portion 17 at the annular inner edge. An axial projecting annular step surface 86 that is closer to the annular lower end surface 85 of the inner cylindrical portion 8 of the upper case 12 in the axial direction than the lower annular step surface 83 in contact with the annular lower surface 82 of the member 54 is provided. ing.

  An annular lower end surface 85 of the inner cylindrical portion 8 of the upper case 12 connected to the small-diameter cylindrical outer surface 70 of the inner cylindrical portion 8 of the upper case 12 is a lower annular step surface 83 of the cylindrical portion 17 of the lower case 22. Further, it faces the axially protruding annular step surface 86 with an annular gap 87.

  The small-diameter cylindrical outer surface 75 in contact with the elastically deformable lip 43 on the inner side of the outer elastic seal member 47 is an annular shape in which the radially protruding cylindrical outer surface 77 and the annular lower surface 68 of the outer elastic seal member 47 are in contact in the axial direction. The lower annular step surface 83 arranged between the step surface 76 and the annular lower surface 82 of the inner elastic seal member 54 is in contact with the axially projecting annular step surface 86 and the intermediate cylindrical inner surface in the radial direction. 81.

The outer elastic seal member 47 includes an elastic seal body 91 having elastically deformable lip portions 43 and 46, and a cored bar 92 embedded in the elastic seal body 91. The lower surface 68 has elastically deformable annular projecting surfaces 93 and 94 arranged concentrically, and is in elastic contact with the annular step surface 76 via the annular projecting surfaces 93 and 94.
Similarly, the inner elastic seal member 54 includes an elastic seal main body 95 having elastically deformable lip portions 50 and 53 and a cored bar 96 embedded in the elastic seal main body 93. The annular lower surface 82 has elastically deformable annular projecting surfaces 97 and 98 arranged concentrically, and elastically contacts the lower annular step surface 83 via the annular projecting surfaces 97 and 98. .

  The annular plate-like portion 28 of the thrust slide bearing piece 33 is separated from each other in the R direction integrally with the annular plate-like portion main body 110 having the annular upper surface 26 and the cylindrical outer surface 111 of the annular plate-like portion main body 110. A plurality of radial protrusions 113 that project radially from the cylindrical outer surface 111 and that define a plurality of recesses 112 spaced apart in the R direction for receiving the protrusions 21 of the lower case 22; The annular upper surface 26 has a plurality of annular grooves 114 and one end opened to the annular groove 114 and the other end opened to the cylindrical outer surface 111 and spaced apart from each other in the R direction. The radial groove 115 is formed, the annular groove 114 and the radial groove 115 serve as a lubricant reservoir such as grease, and the cylindrical portion 31 of the thrust slide bearing piece 33 has a large-diameter cylindrical inner surface. Outside cylindrical contact with 80 And a cylindrical inner peripheral surface 119 formed with axial grooves 118 opened at the inner annular end 29 on the upper side and opened on the lower annular surface 117 on the lower side at equal intervals in the R direction. The large-diameter cylindrical outer surface 69 and the lower case of the outer surface 51 of the inner cylindrical portion 8 of the upper case 12 have a cylindrical gap between the large-diameter cylindrical outer surface 69 and the cylindrical inner peripheral surface 119. 22 and the large-diameter cylindrical inner surface 80 of the inner surface 48 of the cylindrical portion 17, and the axial groove 118 is a reservoir of a lubricant such as grease, like the annular groove 114 and the radial groove 115. ing.

  The thrust sliding bearing 1 described above includes the through-hole 122 defined by the cylindrical inner surface 121 of the inner cylindrical portion 8, the annular inner surface 78 of the lower annular plate-shaped portion 15 and the cylindrical portion 17 concentric with the through-hole 122. The piston rod of the strut assembly is arranged through the small-diameter cylindrical inner surface 79 and the through hole 124 defined by the cylindrical inner surface 123 of the hanging cylindrical portion 19, and the strut assembly mounting mechanism and the coil spring In such a thrust sliding bearing 1, when the coil spring is rotated around the axis O in the R direction by a steering operation, the lower case 22 is attached to the upper spring seat member. Similarly, the upper case 12 is similarly rotated relatively in the R direction, and the rotation of the upper case 12 in the R direction is caused by the thrust slide disposed between the upper case 12 and the lower case 22. Smoothly performed through the rotation of the upper annular plate portion 2 of the annular lower surface 25 of the upper casing 12 with respect to the annular upper surface 26 of the annular plate portion 28 of the bearing piece 33, thus the steering operation is also performed without resistance.

  According to the thrust slide bearing 1, the outer elastic seal member 47 is formed by an inner elastically deformable lip portion 43 that protrudes obliquely upward and inward from the cylindrical inner surface 42 and is integrally formed with the cylindrical inner surface 42. While contacting the small-diameter cylindrical outer surface 75 of the outer surface 41 of the cylindrical portion 17 of the lower case 22, the outer side protrudes obliquely downward from the cylindrical outer surface 45 and is formed integrally with the cylindrical outer surface 45. An elastically deformable lip portion 46 is in contact with the frustoconical inner surface 65 of the inner surface of the outer cylindrical portion 5 of the upper case 12, and further, an annular lower surface 68 of the outer surface of the cylindrical portion 17 of the lower case 22 is annular. An outer elastically deformable lip portion which is in contact with the stepped surface 76 and is formed integrally with the cylindrical outer surface 49 so that the inner elastic sealing member 54 projects obliquely upward and outward from the cylindrical outer surface 49. 50 down While contacting the intermediate cylindrical inner surface 81 of the inner surface 48 of the cylindrical portion 17 of the case 22, the inner elastic deformation integrally formed on the cylindrical inner surface 52 protrudes obliquely downward and inward from the cylindrical inner surface 52. The free lip portion 53 is in contact with the small-diameter cylindrical outer surface 70 of the outer surface 51 of the inner cylindrical portion 8 of the upper case 12, and further, the annular lower surface 82 of the lower annular surface of the inner surface 48 of the cylindrical portion 17 of the lower case 22. Since it is in contact with the stepped surface 83, the space between the annular lower end surface 61 of the outer cylindrical portion 5 of the upper case 12 and the annular upper surface 16 of the lower annular plate-like portion 15 of the lower case 22 even under severe conditions. Between the annular lower end surface 85 of the inner cylindrical portion 8 of the upper case 12 and the lower annular step surface 83 and the axial projecting annular step surface 86 of the cylindrical portion 17 of the lower case 22. Upper ring through an annular gap 87 Intrusion of dust, muddy water, etc. into the annular space 131 between the annular lower surface 25 of the cylindrical portion 2 and the annular upper surface 20 of the cylindrical portion 17 of the lower case 22 and accommodating the annular plate-like portion 28 of the thrust slide bearing piece 33 Can be effectively prevented, and the generation of abnormal noise due to the intrusion of dust, muddy water, etc. can be reduced.

  In addition, according to the thrust slide bearing 1, the annular lower surface 68 of the outer elastic seal member 47 has the annular projecting surfaces 93 and 94 that are elastically deformable, and the annular lower surface 82 of the inner elastic seal member 54 is elastic. Since the ring-shaped projecting surfaces 97 and 98 are deformable, the annular projecting surfaces 93 and 94 and the elastic deformation of 97 and 98 cause the annular lower surface 68 of the outer elastic seal member 47 and the ring of the inner elastic seal member 54 to be deformed. The sealing performance at the lower surface 82 can be improved, dust and muddy water can be more effectively prevented from entering the annular space 131 that accommodates the annular plate-like portion 28 of the thrust slide bearing piece 33, and dust and muddy water can be prevented from entering. The occurrence of abnormal noise can be further preferably reduced.

  Further, since the thrust sliding bearing 1 has the radially projecting cylindrical outer surface 77 and the axial projecting annular stepped surface 86, the outer elastic seal member 47 and the inner elastic seal member 54 are positioned. Preferably it can be done.

  In the thrust sliding bearing 1 described above, the inner surface 44 of the outer cylindrical portion 5 of the upper case 12 includes the frustoconical inner surface 65 and the cylindrical inner surface 66. As shown in FIG. 10 to FIG. 12, the inner surface 44 of the outer cylindrical portion 5 of the upper case 12 has a large-diameter annular upper end at the annular lower end of the truncated conical inner surface 65 in addition to the truncated conical inner surface 65. The upper frustoconical surface 141 having a small diameter annular lower end smaller than the upper end of the large diameter annular ring is connected, and the small diameter annular upper end is connected to the small diameter annular lower end of the upper frustoconical surface 141. And a lower truncated conical surface 142 having a large-diameter annular lower end larger in diameter than the small-diameter annular upper end. In this case, the outer surface 41 of the cylindrical portion 17 of the lower case 22 is also large. Instead of the cylindrical outer surface 67, the upper truncated conical surface 141 and the lower Has a curved concave surface 143 of complementary shape to the frusto-conical surface 142, the upper frusto-conical surface 141 and a lower frusto-conical surface 142, it may have to face with a gap 144 in such a concave curved surface 143.

  Further, in the thrust sliding bearing 1, in order to reduce the weight, the thickness of the wall, and the like, the cylindrical portion 17 of the lower case 22 is opened at the annular upper surface 20 and is arranged at equal intervals in the R direction. A plurality of columnar or triangular columnar recesses 151 may be provided.

DESCRIPTION OF SYMBOLS 1 Thrust slide bearing 2 Upper annular plate-like part 3 Outer annular end part 4 Upper annular end part 5 Outer cylindrical part 6 Inner annular end part 7 Upper annular end part 8 Inner cylindrical part 9 Annular upper surface 10 Upper surface 11 Annular protrusion 12 Upper case 15 Lower annular plate-like portion 16 annular upper surface 17 cylindrical portion 18 annular lower surface 19 hanging cylindrical portion 20 annular upper surface 21 projecting portion 22 lower case 26 annular upper surface 27 annular lower surface 28 annular plate-like portion 29 inner annular end portion 30 upper annular portion End portion 31 Cylindrical portion 33 Thrust sliding bearing piece 41 Outer surface 42 Cylindrical inner surface 43 Lip portion 44 Inner surface 45 Cylindrical outer surface 46 Lip portion 47 Outer elastic seal member 48 Inner surface 49 Cylindrical outer surface 50 Lip portion 51 Outer surface 52 Cylindrical inner surface 53 Lip Part 54 Inner elastic seal member

Claims (3)

An upper case made of a synthetic resin integrally having an upper annular plate-like portion, an outer cylindrical portion, and an inner cylindrical portion, and a synthetic resin that is superimposed on the upper case so as to be rotatable and has a cylindrical portion A synthetic resin thrust sliding bearing piece integrally having a lower case, an annular plate-like portion in contact with the upper annular plate-like portion and the cylindrical portion, and a cylindrical portion disposed between the inner cylindrical portion and the cylindrical portion, respectively. And an inner elastically deformable lip formed integrally with the cylindrical inner surface projecting obliquely upward and inward from the cylindrical inner surface on the outer surface of the cylindrical portion of the lower case, An outer elastically deformable lip portion that projects obliquely downward and outward from the cylindrical outer surface to the frustoconical inner surface and is formed integrally with the cylindrical outer surface, and an annular step on the outer surface of the cylindrical portion of the lower case Contact with each other on the annular bottom surface An outer elastic seal member, and an outer elastically deformable lip portion integrally formed on the outer surface of the cylindrical body, projecting obliquely upward and outward from the cylindrical outer surface to the inner surface of the cylindrical portion of the lower case, An inner elastically deformable lip formed integrally with the inner cylindrical surface, projecting obliquely inwardly from the inner cylindrical surface of the small-diameter cylindrical outer surface of the inner cylindrical portion, and the cylindrical portion of the lower case An inner elastic seal member that is in contact with the lower annular step surface of the inner surface of the inner surface of the inner surface of the cylindrical portion, and the lower case is integrally separated from the annular upper surface of the cylindrical portion in the direction around the axis. The annular plate-like portion of the thrust slide bearing piece has a plurality of recesses or notches that receive the plurality of projections of the lower case. thrust sliding shaft made of are synthetic resin and . The thrust sliding bearing made of synthetic resin according to claim 1, wherein the annular lower surface of the outer elastic seal member has at least one elastically deformable annular projecting surface. The thrust slide bearing made of synthetic resin according to claim 1 or 2, wherein the annular lower surface of the inner elastic seal member has at least one elastically deformable annular projecting surface.

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