JP6631648B2 - Slide bearing made of synthetic resin - Google Patents

Description

  The present invention relates to a sliding bearing made of a synthetic resin, particularly a sliding bearing suitable for being incorporated as a sliding bearing of a strut type suspension (MacPherson type) in a four-wheeled vehicle.

  In general, a strut type suspension is mainly used for a front wheel of a four-wheeled vehicle, and is a combination of a strut assembly having a hydraulic shock absorber incorporated in an outer cylinder integrated with a main shaft and a suspension coil spring. Such a suspension has a structure in which the axis of the suspension coil spring is positively offset with respect to the axis of the strut to smoothly slide the piston rod of the shock absorber incorporated in the strut, and a structure in which the axis of the strut is Some have a structure in which the axes of the suspension coil springs are aligned with each other. In either structure, when the strut assembly rotates together with the suspension coil spring by the steering operation, a ball or needle is inserted between the mounting member of the vehicle body and the upper spring seat member of the suspension coil spring to smoothly allow the rotation. The used rolling bearing or the sliding member made of synthetic resin is provided.

JP-A-2004-293589 JP 2009-250278 A

  By the way, the upper spring seat member on which the bearing is arranged is usually relatively heavy because it is made of sheet metal, and the upper spring seat member made of sheet metal needs to be painted for rust prevention. Even if a sliding bearing made of synthetic resin is used in place of the expensive rolling bearing to reduce the weight and cost of the surrounding area, the weight, manufacturing cost, assembly cost, etc. of the upper spring seat member will reduce the weight and cost. There is a limit to conversion.

  In Patent Document 1, an upper case made of a synthetic resin having a vehicle body side seating surface and an annular lower surface on a vehicle body side is overlapped with the upper case so as to be rotatable around the axis of the upper case, and A lower case made of a reinforced synthetic resin including a reinforcing fiber having an annular upper surface facing the annular lower surface, an annular thrust sliding bearing piece made of a synthetic resin interposed between the annular lower surface and the annular upper surface, and a cylindrical radial. A sliding bearing is proposed which has a bearing piece and a spring seat surface for a suspension coil spring is integrally formed at a portion of a lower case on the outer peripheral side of the vehicle body side bearing surface and the thrust sliding bearing piece. Have been.

  In Patent Document 2, an upper case made of a synthetic resin having a vehicle body side seating surface for a vehicle body side and an annular lower surface, an annular upper surface facing the annular lower surface, and a spring seat surface for a suspension coil spring are integrally formed. A lower case made of a reinforced synthetic resin including reinforcing fibers superposed on the upper case so as to be rotatable about the axis of the upper case, and disposed in an annular gap between the annular lower surface and the annular upper surface. And a thrust slide bearing piece having an annular thrust slide bearing surface slidably in contact with at least one of the annular lower surface and the annular upper surface. A thrust slide bearing is proposed in which the spring bearing surfaces are arranged side by side in the axial direction.

  According to these slide bearings, since the lower case made of reinforced synthetic resin containing reinforcing fibers has a spring seat surface for a suspension coil spring, a spring seat member made of sheet metal can be omitted, and The weight increase due to the upper spring seat member and the increase in price due to the manufacture, painting, and assembly of the sheet metal upper spring seat member, and reduce the weight and cost of the underbody of the vehicle. Can be done.

  However, the lower case, which is one of the sliding mating surfaces of the sliding bearing, is formed of a reinforced synthetic resin containing a reinforcing filler such as glass fiber, so that the sliding bearing made of a synthetic resin and the lower case are not formed. Sliding between them may cause a problem that the slidability is reduced and the smoothness of the steering operation is reduced.

  The present invention has been made in view of the above-described points, and an object thereof is to provide a method of manufacturing a sliding bearing made of a synthetic resin and a lower case made of a reinforced synthetic resin containing a reinforcing filler such as glass fiber. An object of the present invention is to provide a sliding bearing made of a synthetic resin which can prevent the sliding of the sliding member and prevent a decrease in the sliding property and can maintain a smooth steering operation.

The sliding bearing of the present invention includes an upper case, a lower case, and a slide bearing piece disposed between the upper case and the lower case. The lower case has a lower case base and a lower case base. A protrusion protruding upward from the upper surface, and at least one protrusion protruding radially from the lower case base, wherein the sliding bearing piece includes a first sliding bearing piece, and a first sliding bearing piece; A second sliding bearing piece hanging from the bearing piece, and a concave-convex engaging portion formed along the circumferential direction at a lower end of the second sliding bearing piece, the sliding bearing piece includes: The concave / convex engaging portion is engaged with the projection of the lower case, and is disposed between the upper case and the lower case. The lower case slides with respect to the upper case via the first and second sliding bearing pieces. They are freely overlapped.
Further, the synthetic resin sliding bearing of the present invention is superposed on the synthetic resin upper case so as to be rotatable in a circumferential direction around an axis with respect to the upper case. A lower case made of reinforced synthetic resin, and a sliding bearing piece made of synthetic resin disposed between the upper case and the lower case, wherein the upper case has an annular lower surface in the vertical direction. A base, an inner peripheral cylinder hanging down from a radially inner peripheral end of the upper case base, an outer cylindrical hanging down from a radially outer end of the upper case base, and an outer cylindrical An annular flange extending radially outward from the lower end of the hanging portion, and a cylindrical inner peripheral surface that is connected from the annular lower surface of the annular flange to the inner peripheral surface of the outer cylindrical hanging portion. An inner annular ridge extending downward and this inner annular ridge An outer annular ridge extending radially outward from the lower surface of the annular collar to form an inner peripheral upper annular recess in cooperation with the outer annular ridge; and cooperating with the outer annular ridge. The outer peripheral upper annular concave portion is formed radially inward, and has an engaging bulging portion that hangs down from the outer peripheral edge of the annular flange portion and bulges radially inward on the inner peripheral surface. A lower case, an annular lower case base having an annular upper surface and an annular lower surface in the vertical direction, and a cylinder of the lower case base from the annular lower surface of the lower case base. A cylindrical projection projecting downward with a cylindrical inner peripheral surface connected to the inner peripheral surface; and a cylindrical outer peripheral surface projecting upward from an annular upper surface as an upper surface of the lower case base and connected to the cylindrical outer peripheral surface of the lower case base. an annular protrusion as protrusions having a lower casing base An annular flange extending radially outward from the lower end of the outer peripheral surface of the cylinder, and a radially extending outer peripheral surface of the cylindrical outer surface of the lower case base and extending upward from the annular upper surface of the annular flange. At least one projection, an annular ridge projecting upward from the annular upper surface of the annular flange in cooperation with the cylindrical outer peripheral surface of the lower case base and projecting upward; An outer peripheral lower annular concave portion is formed inward in the radial direction in cooperation with the ridge portion to protrude upward from the annular upper surface of the annular flange portion and bulge radially outward on the outer peripheral surface. An engagement protrusion having an engagement bulging portion, and an annular plate-like portion extending radially outward from the outer peripheral lower end of the annular flange portion are provided. An annular thrust slide bearing piece as a first slide bearing piece having an annular upper surface and an annular lower surface; A cylindrical radial sliding bearing piece as a second sliding bearing piece having a cylindrical inner peripheral surface and a cylindrical outer peripheral surface, which is suspended from an outer peripheral end of the thrust sliding bearing piece, A concave and convex engaging portion having a convex portion and a concave portion alternately formed along the circumferential direction at a lower end portion of the cylindrical inner peripheral surface of the portion. the lower surface of the contacting in an annular upper surface of the annular projection of the lower case, with respect to the lower case with contacting the cylindrical inner peripheral surface of the radial sliding bearing piece portion on the cylindrical outer peripheral surface of the annular projection of the lower case The concave portion of the concave / convex engaging portion is engaged with the projection of the lower case so as to prohibit rotation about the axis of the upper case, and is disposed between the upper case and the lower case. Thrust sliding bearing piece The upper surface of the ring is slidably contacted with the upper surface, and the inner circumferential surface of the outer cylindrical portion is slidably contacted with the outer circumferential surface of the radial sliding bearing piece. The lower annular peripheral concave portion and the outer annular ridge portion face the outer peripheral lower annular concave portion of the lower case, respectively, and the engaging bulging portion of the engaging vertical portion is engaged with the engaging projecting portion of the lower case. It is elastically attached to the bulging part and combined with the lower case.

According to such a sliding bearing made of synthetic resin, since the concave portion of the concave-convex engaging portion is engaged with the projection, rotation of the sliding bearing piece around the axis with respect to the lower case is prohibited. As a result, the sliding between the sliding bearing piece and the upper case and the lower case is performed between the annular upper surface of the thrust sliding bearing piece and the annular lower surface of the upper case base and the cylindrical outer peripheral surface of the radial sliding bearing piece. since it is limited to the sliding of the synthetic resin having excellent same mechanic sliding property between the cylindrical inner peripheral surface of the outer peripheral-side cylindrical suspended portion, can avoid wear by the lower case of the sliding bearing piece, the for a long time Smooth steering operation is performed.

  Further, in the sliding bearing of the present invention, between the annular upper surface of the thrust sliding bearing piece portion and the annular lower surface of the upper case base, and the cylindrical outer peripheral surface of the radial sliding bearing piece portion and the cylindrical inner circumference of the outer peripheral side cylindrical hanging portion. Each of the sliding surfaces between the upper and lower surfaces has an annular gap formed at the lower end portion of the engagement protrusion formed at an elastic mounting portion between the engagement hanging portion of the upper case and the engagement protrusion of the lower case. While being closed by the annular plate-like portion, the inner annular ridge of the annular flange of the upper case is formed in the lower annular recess of the inner periphery of the lower case, and the outer annular ridge is formed of the lower annular outer periphery of the lower case. The space between the upper case and the lower case is closed by a sealing portion having a labyrinth action formed to face each of the concave portions and is protected against intrusion of dust and the like. Minimize the deterioration of sliding characteristics due to intrusion Door can be.

  In the synthetic resin sliding bearing of the present invention, the lower case base and the cylindrical protrusion protruding downward from the annular lower surface of the lower case base include the cylindrical portion fitted to the cylindrical outer peripheral surface of the cylindrical protrusion. It may be reinforced by a metal reinforcing member integrally formed at one end of the cylindrical portion and having an annular flange portion in contact with the annular lower surface of the lower case base.

  According to such a sliding bearing, the annular lower surface of the lower case base serving as the contact surface of the suspension coil spring is reinforced by the metal reinforcing member, so that the strength of the annular lower surface can be further improved. Therefore, damage to the annular lower surface, and eventually the lower case, can be avoided.

  In the synthetic resin sliding bearing of the present invention, an annular concave groove is formed on the annular end surface of the cylindrical projection of the lower case, and the end of the cylindrical outer peripheral surface of the cylindrical projection on which the annular groove is formed. The outer peripheral surface may be formed as an annular tapered surface that gradually increases in diameter toward the annular end surface of the cylindrical protrusion outside the cylindrical outer surface of the cylindrical protrusion except for the cylindrical outer surface. In this case, the reinforcing member fitted to the cylindrical outer peripheral surface of the cylindrical projection has an outer peripheral end formed as an annular tapered surface of the cylindrical projection in the cylindrical portion. By projecting in the direction, it may be prevented from falling down.

  According to such a sliding bearing, since the annular groove is formed on the annular lower surface of the cylindrical projection, the diameter of the cylindrical outer peripheral surface at the lower end of the cylindrical projection is easily reduced, and the radial direction is increased. Due to the elastic deformation of the lower end of the cylindrical projection inward, the cylindrical member of the reinforcing member can be easily inserted into the cylindrical projection, and after the insertion, the lower case is radially outwardly inserted. Since the reinforcing member is prevented from falling down by the end of the cylindrical outer peripheral surface of the cylindrical protrusion having an enlarged diameter, the reinforcing member and the sliding bearing are connected until the sliding bearing is attached to the mounting member of the strut type suspension. Since they can be handled integrally, their handling becomes easy.

  The thrust slide bearing piece portion of the slide bearing piece has a plurality of inner recesses and outer recesses formed on the upper surface of the annular shape along the circumferential direction and radially at least in two rows of the inner row and the outer row. The inner concave portion and the outer concave portion may be arranged with a phase difference in a circumferential direction from each other.

Each of the plurality of inner concave portions has an inner arc-shaped wall surface as an inner wall surface extending in an arc shape around the axis, and an arc shape centered on the axis radially outward with respect to the inner arc wall surface. An outer arc-shaped wall surface as an outer wall surface extending to a pair of semicircular wall surfaces as a pair of wall surfaces connected to the inner arc-shaped wall surface and the outer arc-shaped wall surface and facing each other in the circumferential direction, The inner arc-shaped wall surface, the outer arc-shaped wall surface, and the bottom wall surface connected to each of the pair of semicircular wall surfaces may be defined. An inner arc-shaped wall surface as an inner wall surface extending in an arc shape, and an outer arc-shaped wall surface as an outer wall surface extending in an arc shape around an axis radially outward with respect to the inner arc-shaped wall surface, Each of the inner and outer arc-shaped walls A pair of semicircular wall surfaces of a pair of wall surfaces facing in the circumferential direction from each other with being connected, the inner arcuate wall, which is connected to each of the outer arcuate wall and the pair of semicircular wall It may be defined by the bottom wall surface.

Further, the thrust slide bearing piece may have at least two annular concave grooves as concave grooves formed along the circumferential direction and concentric with each other on the arc-shaped upper surface.

  Percentage of the total area of the opening surfaces of the plurality of inner recesses and the outer recesses occupying the combined surface of the opening surfaces of the plurality of inner recesses and the outer recesses and the annular upper surface of the thrust sliding bearing piece, Percentage of the total area of the opening surfaces of the plurality of annular grooves occupying the combined surface of the opening surface of the annular groove and the annular upper surface of the thrust slide bearing piece, or the openings of the plurality of inner recesses and outer recesses Surface and the opening surfaces of the plurality of annular grooves and the opening surfaces of the plurality of inner recesses and the outer recesses and the plurality of annular recesses occupying the combined surface of the thrust slide bearing piece and the annular upper surface. The ratio of the total area to the opening surface is preferably 20 to 50%, more preferably 30 to 40%.

  In the inner concave portion, the outer concave portion, and the annular concave groove for holding a lubricating oil such as grease, the above ratio is preferably at least 20%, and if it exceeds 50%, the strength of the thrust slide bearing piece decreases. And plastic deformation such as creep tends to occur.

The radial slide bearing piece portion of the slide bearing piece has a plurality of axial grooves that are open in the vertical direction and are formed on the outer peripheral surface of the cylinder as a plurality of grooves formed at equal intervals in the circumferential direction. These axial grooves may also serve as reservoirs for holding a lubricant such as grease.

  The synthetic resin sliding bearing of the present invention is preferably used as a sliding bearing of a strut type suspension in a four-wheeled vehicle.

  The synthetic resin forming the upper case may be a thermoplastic synthetic resin such as polyacetal resin, polyamide resin or polybutylene terephthalate resin, and the synthetic resin forming the lower case may be glass fiber, glass powder, carbon fiber, or the like. A reinforced thermoplastic synthetic resin such as a polyacetal resin, a polyamide resin, or a polybutylene terephthalate resin containing 30 to 50% by mass of a reinforcing filler such as a polyacetal resin may be used. Preferred examples thereof include thermoplastic synthetic resins such as polyamide resins, polybutylene terephthalate resins, and polyolefin resins including polyethylene resins.

According to the present invention, between the annular upper surface of the thrust slide bearing piece portion and the annular lower surface of the upper case base, and between the cylindrical outer peripheral surface of the radial slide bearing piece portion and the cylindrical inner periphery of the outer cylindrical lower portion of the upper case. An annular gap formed in the elastic mounting portion between the engaging hanging portion of the upper case and the engaging projecting portion of the lower case is formed at the lower end of the engaging projecting portion. While the inner annular ridge of the annular flange of the upper case is in the lower inner annular recess of the lower case, and the outer annular ridge is in the outer lower annular recess of the lower case. The space between the upper case and the lower case is closed by a sealing portion having a labyrinth action formed to face each other and is protected against intrusion of dust and the like, so that dust and the like enter the sliding surface. It is possible to prevent the deterioration of the sliding characteristics due to The concave portions of the concavo-convex engagement portion because they are meshed with the protrusion, in the sliding bearing piece, the result of its rotation in the axis of rotation relative to the lower case is prohibited, sliding bearing piece and the upper and lower cases Sliding between the annular upper surface of the thrust sliding bearing piece and the annular lower surface of the upper case base, and the cylindrical outer circumferential surface of the radial sliding bearing piece and the cylindrical inner circumferential surface of the outer cylindrical hanging portion. since it is limited to the sliding of the synthetic resin having excellent same mechanic sliding property between, can avoid wear by the lower case of the sliding bearing piece, synthetic resin capable of performing a smooth steering operation over a long Can be provided.

FIG. 1 is an explanatory cross-sectional view of a preferred example of an embodiment of the present invention taken along line II shown in FIG. FIG. 2 is an explanatory plan view of the example shown in FIG. FIG. 3 is a partially enlarged sectional explanatory view of the example shown in FIG. FIG. 4 is an explanatory plan view of the upper case of the example shown in FIG. FIG. 5 is an explanatory cross-sectional view taken along line VV of the upper case of the example shown in FIG. 4. FIG. 6 is a partially enlarged sectional explanatory view of the upper case of the example shown in FIG. FIG. 7 is an explanatory plan view of the lower case of the example shown in FIG. FIG. 8 is an explanatory cross-sectional view taken along line VIII-VIII of the lower case of the example shown in FIG. 7. FIG. 9 is a partially enlarged sectional explanatory view of the lower case of the example shown in FIG. FIG. 10 is an enlarged plan view of the projection of the lower case of the example shown in FIG. FIG. 11 is an enlarged sectional explanatory view of the elastic mounting portions of the upper case and the lower case of the example shown in FIG. FIG. 12 is an explanatory plan view of the slide bearing piece of the example shown in FIG. FIG. 13 is an explanatory cross-sectional view of the slide bearing piece of the example shown in FIG. 12 taken along line XIII-XIII. FIG. 14 is an explanatory bottom view of the slide bearing piece of the example shown in FIG. Figure 15 is a X V- X V line arrow sectional view of the sliding bearing piece of the embodiment shown in FIG. 12. FIG. 16 is a partially enlarged sectional explanatory view of the slide bearing piece of the example shown in FIG. FIG. 17 is a partially enlarged plan view of the slide bearing piece of the example shown in FIG. FIG. 18 is a partially enlarged plan view of the sliding bearing of the example shown in FIG. FIG. 19 is an explanatory plan view of another embodiment of the slide bearing piece of the example shown in FIG. 1. FIG. 20 is an explanatory cross-sectional view taken along line XX-XX of the sliding bearing piece of the example shown in FIG. 19. FIG. 21 is an explanatory plan view of the reinforcing member of the example shown in FIG. 1. FIG. 22 is an explanatory cross-sectional view of the reinforcing member of the example shown in FIG. 21 taken along line XXII-XXII. FIG. 23 is a partially enlarged cross-sectional explanatory view of the lower case and the mounting portion of the reinforcing member in the example shown in FIG. FIG. 24 is a partially enlarged cross-sectional explanatory view of a mounting portion of the lower case and the flange portion of the reinforcing member in the example shown in FIG. 1. FIG. 25 is an explanatory cross-sectional view in which the slide bearing shown in FIG. 1 is incorporated in a strut type suspension.

  1 to 3, a synthetic resin sliding bearing 1 of the present example for use in a strut-type suspension in a four-wheeled vehicle includes a synthetic resin upper case 2 fixed to a vehicle body via an attachment member; A lower case 3 made of synthetic resin superposed on the upper case 2 so as to be rotatable in a circumferential direction R around an axis O with respect to the upper case 2, and a space between the upper case 2 and the lower case 3 4 and a sliding bearing piece 5 made of synthetic resin.

  As shown in FIGS. 4 to 6, the upper case 2 has an annular upper case base 7 having an annular lower surface 6 in the axial direction, that is, the vertical direction Y, and a radial direction X of the upper case base 7. , An inner cylindrical hanging portion 9 hanging from an inner circumferential end 8, an outer cylindrical hanging portion 11 hanging from an outer circumferential end 10 of the upper case base 7 in the radial direction X, and a lower end of the outer cylindrical hanging portion 11. An annular flange portion 13 extending outward in the radial direction X from the portion 12, and a cylindrical inner peripheral surface 16 connected to the cylindrical inner peripheral surface 15 of the outer peripheral side cylindrical hanging portion 11 from the annular lower surface 14 of the annular flange portion 13. An inner annular ridge 17 extending downward in the vertical direction Y, and an inner annular upper annular recess 18 formed radially outward in cooperation with the inner annular ridge 17 to form an annular flange portion. 13, an outer annular ridge 19 extending downward from the annular lower surface 14 in the vertical direction Y; The outer peripheral upper annular concave portion 20 is formed inward in the radial direction X in cooperation with the side annular ridge portion 19 to hang down from the outer peripheral edge portion 21 of the annular flange portion 13 and to extend in the radial direction X to the inner peripheral surface. An inclined swelling portion 24 that gradually expands in diameter and an inclined swelling portion 24 that is connected to the sloping surface portion 22 and swells inward in the radial direction X with an inclined surface portion 23 that gradually reduces inward in the radial direction X. And the engaging hanging part 25.

  The annular flange 13 has one end connected to the cylindrical outer peripheral surface 26 of the outer cylindrical hanging portion 11 and the other end inclined outward in the radial direction X so that the annular flange 13 has an annular shape. It is reinforced by a reinforcing rib 28 having a triangular cross section connected to the upper surface 27, and a plurality of reinforcing ribs 28 are formed along the circumferential direction R of the annular flange portion 13.

  The lower case 3 has an annular lower case base 31 having an annular upper surface 29 and an annular lower surface 30 in the vertical direction Y, and an annular lower surface 30 of the lower case base 31, as shown in FIGS. A cylindrical projecting portion 34 having a cylindrical inner peripheral surface 33 connected to the cylindrical inner peripheral surface 32 of the lower case base 31 and extending downward in the vertical direction Y; and an annular upper surface 29 of the lower case base 31 on the lower case base 31. Having a cylindrical outer peripheral surface 37 projecting upward in the vertical direction Y while leaving an annular shoulder 35 outward in the radial direction X and a cylindrical outer peripheral surface 36 of the lower case base 31. An annular projecting portion 38 and an annular lower surface 4 extending radially outward at a lower end portion 39 of the cylindrical outer peripheral surface 36 of the lower case base 31 and connected to the annular upper surface 40 and the annular lower surface 30 of the lower case base 31. 7 and at least one of which projects radially outward from the cylindrical outer peripheral surface 36 of the lower case base 31 in the radial direction X and whose lower surface is connected to the annular upper surface 40 of the annular flange 42, FIG. In the present example shown in FIG. 2, two projections 43 having a triangular shape in plan view formed to face each other in the radial direction X, and a cylindrical outer peripheral surface 36 of the lower case base 31 on the annular upper surface 40 of the annular flange 42. An annular ridge 45 is formed on the outer side in the radial direction X to form an inner lower annular recess 44 and projects upward in the vertical direction Y. A concave portion 46 is formed to project upward in the up-down direction Y, and the outer peripheral surface thereof gradually decreases in diameter in the radial direction X with respect to the annular upper surface 40. Bulging with an inclined surface portion 48 whose diameter gradually decreases inward in the direction X And an annular plate-shaped extending outward in the radial direction X to the outer peripheral lower end portion 51 of the annular flange portion 42 in connection with the engaging projecting portion 50. And a part 52.

  The cylindrical protrusion 34 has an annular protrusion 53 extending inward in the radial direction X on the cylindrical inner peripheral surface 33. The annular projection 53 serves as a reinforcing rib that increases the radially inward compression strength of the cylindrical projection 34 in the radial direction X.

  An annular groove 55 is formed in the annular end surface 54 of the cylindrical projection 34 so as to open to the annular end surface 54. An outer peripheral surface of an end 56 of the cylindrical projection 34 in which the annular groove 55 is formed has a cylindrical projection. The annular tapered surface 58 gradually expands radially outward in the radial direction X downward in the vertical direction Y from the cylindrical outer peripheral surface 57 of the portion 34, and the cylindrical projecting portion 34 formed on the annular tapered surface 58 is formed. The end 56 has flexibility in the radial direction X.

  The annular lower surface 30 of the lower case base 31 and the annular lower surface 41 of the annular flange portion 42 are formed with a wide annular concave portion 59 connected to the cylindrical outer peripheral surface 57 of the cylindrical projecting portion 34. A contact portion of the metal reinforcing member 93 is formed.

  In the annular upper surface 60 of the annular projecting portion 38, a hole 62 having a bottom 61 which opens to the annular upper surface 60 and extends downward from the annular upper surface 60 in the vertical direction Y to the lower case base 31 is formed. A plurality are formed along the direction R. As shown in FIGS. 7, 8 and 9, the hole 62 has a rectangular opening 63 in a plan view, and the opposite sides of the opening 63 are gradually reduced as the long side 63a of the opening 63 extends downward in the vertical direction Y. The inclined surface 64 is formed. These holes 62 serve to make the thickness of the lower case base 31 and the annular projection 38 as uniform as possible, and to minimize the occurrence of sink marks and the like during molding.

  As shown in FIG. 11, the upper case 2 and the lower case 3 are configured such that the engagement swelling portion 24 of the engagement hanging portion 25 of the upper case 2 is engaged with the engagement swelling portion 49 of the engagement protrusion 50 of the lower case 3. And elastically attached to each other. Since the engagement gap S of the elastic mounting portion is closed by the annular plate-shaped portion 52 extending outward in the radial direction X at the outer peripheral lower end portion 51 of the annular flange portion 42, dust and the like from the engagement gap S Intrusion is prevented as much as possible.

  In particular, as shown in FIGS. 12 to 18, the sliding bearing piece 5 made of synthetic resin disposed in the space 4 has an annular shape in the vertical direction Y that slidably contacts the annular lower surface 6 of the upper case base 7. Thrust slide bearing piece 67 having an annular lower surface 66 that contacts the upper surface 65 of the lower case base and the annular upper surface 60 of the annular projection 38 of the lower case base 31, and the radial direction X of the thrust slide bearing piece 67. A radial slide having an outer peripheral end 68 hanging down through an annular thin portion 70 having an annular upper surface 69 connected to the annular upper surface 65 of the thrust slide bearing piece 67 and having a cylindrical inner peripheral surface 71 and a cylindrical outer peripheral surface 72. In the vertical direction Y of the bearing piece 73 and the cylindrical inner peripheral surface 71 of the radial slide bearing piece 73, a convex portion 74 having a triangular cross section and a concave portion 75 having a triangular cross section are formed in the circumferential direction R at the lower part. Alternating along Top 74a of the convex portion 74 has a concave-convex engagement portions 76 formed on the cylindrical inner peripheral surface 71 flush with the radial sliding bearing piece 73 with being.

  The sliding bearing piece 5 is formed in a circular shape around the axis O with respect to the lower case 3 by engaging the projections 43 and 43 formed on the cylindrical outer peripheral surface 36 of the lower case base 31 with the concave portions 75 of the uneven engagement portion 76. Since rotation in the circumferential direction R is prevented (prohibited) and integrated with the lower case 3, there is no sliding between the sliding bearing piece 5 and the lower case 3. In this example, the concave-convex engaging portion 76 is formed over the entire circumference in the circumferential direction R of the cylindrical inner peripheral surface 71 of the radial sliding bearing piece 73, but the concave-convex engaging portion 76 corresponds to the protrusion 43. It may be formed only at the portion of the cylindrical inner peripheral surface 71 of the radial slide bearing piece 73.

  The thrust slide bearing piece 67 has a plurality of inner recesses 77 and outer recesses 78 formed on the annular upper surface 65 along the circumferential direction R and at least two rows in the radial direction X in the inner row and the outer row. are doing.

  Each of the plurality of inner concave portions 77 formed in the inner row has an inner arc-shaped wall surface 79 extending in an arc shape around the axis O, and an axially outer portion in the radial direction X with respect to the inner arc-shaped wall surface 79. The outer arc-shaped wall surface 80 extending in an arc shape around the center O, that is, expanded in the radial direction X with respect to the inner arc-shaped wall surface 79, and each of the inner arc-shaped wall surface 79 and the outer arc-shaped wall surface 80 A pair of semicircular wall surfaces 81 which are connected and face each other in the circumferential direction R, and a bottom wall surface 77a which is connected to the inner circular wall surface 79, the outer circular wall surface 80, and the pair of semicircular wall surfaces 81, respectively. It is specified by.

  Each of the plurality of outer concave portions 78 formed in the outer row has an inner arc-shaped wall surface 82 extending in an arc around the axis O, and an axially outer portion in the radial direction X with respect to the inner arc-shaped wall surface 82. An outer arc-shaped wall surface 83 extending in an arc shape around the center O, that is, expanded in the radial direction X with respect to the inner arc-shaped wall surface 82, and an inner arc-shaped wall surface 82 and an outer arc-shaped wall surface 83, respectively. A pair of semicircular wall surfaces 84 that are connected and face each other in the circumferential direction R, and a bottom wall surface 78a that is connected to each of the inner circular wall surface 82, the outer circular wall surface 83, and the pair of semicircular wall surfaces 84 Are arranged at positions corresponding to the notches 85 in the circumferential direction R between the inner concave portions 77 formed in the inner row, so that the inner concave portion 77 and the outer concave portion 78 are mutually They are arranged with a phase difference in the circumferential direction R.

  A plurality of inner concave portions 77 and outer concave portions 78 formed on the annular upper surface 65 of the thrust slide bearing piece portion 67 along the circumferential direction R and in the radial direction X in two rows of an inner row and an outer row are formed as inner recesses. The total area of the opening surfaces 86 of the inner concave portion 77 and the outer concave portion 78 occupying the total area of the opening surface 86 of the outer concave portion 77 and the annular upper surface 65 of the thrust sliding bearing piece 67 which is the thrust sliding bearing surface. Are arranged in such a manner that the ratio of the components is 20 to 50%, preferably 30 to 40%.

  The radial slide bearing piece 73 has a plurality of axial grooves 87 which are open at both ends in the vertical direction Y and are formed at regular intervals in the circumferential direction R on the cylindrical outer peripheral surface 72.

  A plurality of inner recesses 77 and outer recesses 78 formed on the annular upper surface 65 of the thrust slide bearing piece portion 67 along the circumferential direction R and at least two rows in the radial direction X in the inner row and the outer row, and radial sliding. The plurality of axial grooves 87 formed on the cylindrical outer peripheral surface 72 of the bearing piece 73 serve as a reservoir for a lubricant such as grease.

  In another embodiment of the slide bearing piece 5 shown in FIGS. 19 and 20, the annular upper surface 65 of the thrust slide bearing piece 67 has an inner row and an outer row along the circumferential direction R and in the radial direction X. The inner annular groove 88 and the outer annular groove 89 formed over the two rows are formed and are equally spaced in the circumferential direction R on the cylindrical outer peripheral surface 72 of the radial slide bearing piece 73. A plurality of axial grooves 87 may be formed.

  An inner annular groove 88 and an outer annular groove 89 are formed on the annular upper surface 65 of the thrust slide bearing piece 67 along the circumferential direction R and in the radial direction X over two rows of an inner row and an outer row. , The inner annular groove 88 occupying the total area of the opening surface 90 of the inner annular groove 88 and the outer annular groove 89 and the annular upper surface 65 of the thrust slide bearing piece 67 serving as the thrust slide bearing surface. The outer annular concave groove 89 is formed so that the ratio of the total area of the opening surface 90 is 20 to 50%, preferably 30 to 40%.

Sliding bearing piece 5, as shown in FIGS. 1 and 3, is brought into contact with the annular lower surface 66 of the thrust sliding bearing piece portion 67 to the annular upper surface 60 of the annular protrusion 38, the radial sliding bearing piece 73 When contacting the cylindrical inner peripheral surface 71 a cylindrical outer peripheral surface 3 7 annular protrusion 38 co the recess 75 of the concave convex engaging portion 76 is engaged with the protrusion 43 of the lower casing base 31, the lower case 3 On the other hand, rotation in the circumferential direction R is prevented around the axis O, and the lower case 3 is integrated with the lower case 3 and assembled.

  The sliding bearing piece 5 attached to the lower case 3 has the annular lower surface 6 of the upper case base 7 slidably contacting the annular upper surface 65 of the thrust sliding bearing piece 67, and the radial sliding bearing piece. The upper case 2 is assembled by bringing the cylindrical inner circumferential surface 15 of the outer cylindrical hanging portion 11 of the upper case base 7 into sliding contact with the cylindrical outer circumferential surface 72 of the upper case 73.

According to the sliding bearing 1 thus formed, the thrust sliding bearing piece 67 of the sliding bearing piece 5, the annular lower surface 6 of the upper case base 7, and the outer peripheral cylinder of the radial sliding bearing piece 73 and the upper case base 7. A sliding surface is formed only between the hanging portion 11 and the inner circumferential surface 15 of the cylinder, and the annular upper surface 65 of the thrust slide bearing piece 67 serving as the sliding surface is arranged along the circumferential direction R and in the radial direction. X has a plurality of inner concave portions 77 and outer concave portions 78 or inner annular concave grooves 88 and outer annular concave grooves 89 formed in two rows of an inner row and an outer row, and a radial sliding bearing serving as a sliding surface. Since a plurality of axial grooves 87 are formed in the cylindrical outer peripheral surface 72 of the piece 73 along the circumferential direction R, the annular upper surface 65 of the thrust slide bearing piece 67 and the upper case base 7 are formed. Circumferential direction around axis O with annular lower surface 6 R relative rotation and relative rotation in the circumferential direction R around the axis O between the cylindrical outer peripheral surface 72 of the radial slide bearing piece 73 and the cylindrical inner peripheral surface 15 of the outer cylindrical hanging portion 11 of the upper case base 7. In this case, the contact area of the upper case base 7 with the annular lower surface 6 and the contact area of the upper case base 7 with the cylindrical inner peripheral surface 15 of the outer peripheral cylindrical hanging portion 11 are reduced, and the annular upper surface 65 and the outer peripheral side are reduced. it is possible to increase the surface pressure acting on the cylindrical inner peripheral surface 15 of the cylindrical suspended portion 11 (load per unit area), low friction and inner recess 77 and outer recess 78 or inner annular frictional synthetic resin same mechanic The friction can be further reduced by the lubricating oil filled in the concave groove 88, the outer annular concave groove 89, and the axial groove 90 being interposed on the sliding surface.

  A metal reinforcing member 93 having a cylindrical portion 91 and a wide annular flange portion 92 extending outward in the radial direction X at one end of the cylindrical portion 91 shown in FIGS. The surface 94 of the flange 92 is brought into contact with the annular lower surface 30 of the lower case base 31 and the annular lower surface 41 of the annular flange 42, and the cylindrical inner peripheral surface 95 of the cylindrical portion 91 is brought into contact with the cylindrical projection 34 of the lower case base 31. The lower case 3 is mounted so as to be fitted into the outer peripheral surface 57 of the cylinder.

By attaching the metal reinforcing member 93 to the lower case 3, the annular lower surface 30 of the lower case base 31 of the lower case 3 serving as a spring seat of the suspension coil spring is reinforced by the reinforcing member 93. When the reinforcing member 93 is mounted on the lower case 3, the end 56 of the cylindrical protruding portion 34 on which the annular tapered surface 58 of the lower case base 31 is formed is elastically deformed by the imparted flexibility, and the reinforcing member 93 is deformed. not readily perform fitted to the cylindrical outer peripheral surface 57 of the cylindrical protrusion 34 of the lower casing base 31, in the fitted after interpolation, as shown in FIG. 2 3, annular tapered end 56 of the cylindrical projecting portion 34 The surface 58 is elastically restored outward in the radial direction X from the cylindrical outer peripheral surface 57 of the cylindrical projecting portion 34 of the lower case base 31 so that the end of the cylindrical portion 91 of the reinforcing member 93 moves downward in the vertical direction Y. Is prevented from coming off, the lower case 3 and the reinforcing member 93 can be handled integrally, and the mounting of the sliding bearing 1 with the reinforcing member 93 mounted on the strut assembly can be facilitated.

  For example, as shown in FIG. 25, the sliding bearing 1 formed as described above has the annular upper surface 7 a of the upper case 2 brought into contact with the mounting member 96 on the vehicle body side, and a spring is attached to the upper end of the suspension coil spring 97. The annular lower surface 30 of the lower case base 31 as the seat surface or the annular flange portion 92 of the metal reinforcing member 93 mounted on the annular lower surface 30 of the lower case base 31 is brought into contact with the synthetic resin of the present example. The sliding bearing 1 made of synthetic resin is disposed between the vehicle body side seating surface 98 of the mounting member 96 on the vehicle body side and the upper end of the suspension coil spring 97, and the sliding bearing 1 made of synthetic resin of this embodiment is a strut of a four-wheeled vehicle. It may be applied to a mold suspension.

In the strut type suspension shown in FIG. 25, the relative rotation of the suspension coil spring 97 in the circumferential direction R with respect to the mounting member 96 on the vehicle body side is caused by the thrust slide bearing piece portion with respect to the annular lower surface 6 of the upper case base 7 in the slide bearing 1. 67 yen annular upper surface 65 and the outer cylindrical suspended portion 11 of synthetic resin What happened with excellent sliding characteristics of each of the cylindrical outer peripheral surface 72 of the radial sliding bearing piece portion 73 with respect to the cylindrical inner peripheral surface 15 of the upper casing base 7 of Relative sliding in the circumferential direction R.

REFERENCE SIGNS LIST 1 sliding bearing 2 upper case 3 lower case 4 space 5 sliding bearing piece 6 annular lower surface 7 upper case base 9 inner peripheral cylindrical hanging part 11 outer peripheral cylindrical hanging part 24 engaging bulging part 25 engaging hanging part 30 annular Lower surface 31 Lower case base 34 Cylindrical projection 38 Annular projection 42 Annular flange 43 Projection 49 Engagement bulge 50 Engagement projection 67 Thrust slide bearing piece 73 Radial slide bearing piece 74 Convex 75 Recess 76

Claims (9)

  An upper case, a lower case, and a slide bearing piece disposed between the upper case and the lower case, wherein the lower case has a lower case base and a protrusion protruding upward from an upper surface of the lower case base. Part, and at least one protrusion protruding radially outward from the lower case base, wherein the slide bearing piece includes a first slide bearing piece and a first slide bearing piece. Irregularities having a second sliding bearing piece hanging down from the outer peripheral end, and a convex and a concave formed alternately along the circumferential direction at the lower end of the inner peripheral surface of the second sliding bearing piece. The sliding bearing piece is arranged between the upper case and the lower case by engaging the concave portion of the concave-convex meshing portion with the projection of the lower case, and the lower case is arranged with respect to the upper case. Slidably overlapped via the first and second sliding bearing pieces It has been that the slide bearing.   The first slide bearing piece has a plurality of inner recesses and outer recesses formed in at least two rows of an inner row and an outer row in a radial direction on an upper surface thereof. The sliding bearing according to claim 1, wherein the sliding bearing has a plurality of grooves.   Each of the plurality of inner recesses includes an inner wall surface, an outer wall surface radially enlarged with respect to the inner wall surface, a pair of wall surfaces connected to the inner wall surface and the outer wall surface, respectively, and the inner wall surface. The sliding bearing according to claim 2, wherein the sliding bearing is defined by an outer wall surface and a bottom wall surface connected to each of the pair of wall surfaces.   Each of the plurality of outer recesses includes an inner wall surface, an outer wall surface radially enlarged with respect to the inner wall surface, a pair of wall surfaces connected to the inner wall surface and the outer wall surface, and the inner wall surface. 4. The sliding bearing according to claim 2, wherein the sliding bearing is defined by an outer wall surface and a bottom wall surface connected to each of the pair of wall surfaces.   The ratio of the total area of the opening surfaces of the plurality of inner recesses and the outer recesses to the combined surface of the opening surfaces of the plurality of inner recesses and the outer recesses and the upper surface of the first slide bearing piece is 20 to 50%. The sliding bearing according to any one of claims 2 to 4, wherein   The sliding bearing according to claim 1, wherein the first sliding bearing piece has an annular concave groove formed concentrically with each other on at least two rows of an inner row and an outer row.   Percentage of the total area of the opening surfaces of the annular grooves formed in at least two rows occupying the combined surface of the opening surface of the annular grooves formed in at least two rows and the upper surface of the first sliding bearing piece portion The sliding bearing according to claim 6, wherein is 20 to 50%.   The first slide bearing piece further includes, in addition to the plurality of inner concave portions and the outer concave portions, an annular concave groove formed concentrically with each other and formed in at least two rows of an inner row and an outer row. The sliding bearing according to any one of claims 2 to 4, wherein the sliding bearing is provided. The plurality of inner concave portions and the outer portion occupying a surface obtained by combining the opening surfaces of the plurality of inner concave portions and the outer concave portions, the opening surfaces of the annular concave grooves formed in at least two rows, and the upper surface of the first sliding bearing piece. The sliding bearing according to claim 8, wherein the ratio of the total area of the opening surfaces of the concave portions and the opening surfaces of the annular concave grooves formed in at least two rows is 20 to 50%.

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