JP6319345B2 - Synthetic plastic plain bearing - Google Patents

Description

  The present invention relates to a thrust sliding bearing, and more particularly to a synthetic resin sliding bearing that is preferably incorporated as a sliding bearing for a strut suspension (McPherson type) in a four-wheeled vehicle.

  In general, a strut suspension is mainly used for a front wheel of a four-wheeled vehicle, and is a combination of a suspension coil spring and a strut assembly in which a hydraulic shock absorber is incorporated in an outer cylinder integrated with a main shaft. In such a 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 either type, the rotation of the strut assembly In order to allow a smooth movement, a synthetic resin sliding bearing may be used instead of the rolling ball bearing between the mounting member of the vehicle body and the upper spring seat of the coil spring.

JP 2001-27227 A JP 2001-27228 A JP 2001-27229 A

  Synthetic resin slide comprising a synthetic resin lower case, a synthetic resin upper case overlaid on the lower case, and synthetic resin sliding bearing means disposed in the space between the upper and lower cases With regard to the bearing, in Patent Document 1, a composite including an outer elastic sealing means disposed on the outer peripheral side between the upper and lower cases and an inner elastic sealing means disposed on the inner peripheral side between the upper and lower cases. In Patent Document 2, a resin-made sliding bearing is provided with an outer seal means disposed on the outer peripheral side in the space between the upper and lower cases, and an inner labyrinth seal disposed on the inner peripheral side in the space between the upper and lower cases. And a sliding bearing made of a synthetic resin provided with a means is arranged so as to cover the outer surface of the lower case in Patent Document 3, and at the lower and upper ends at both annular ends. Space of the outer and inner annular opening synthetic resin sliding bearing provided with the elastic sealing means closes the-case has been proposed.

  By the way, in the sliding bearing of Patent Document 1, in order to seal the gaps on the inner and outer peripheral sides between the upper and lower cases, separate inner elastic sealing means and outer elastic sealing means are arranged in the respective gaps. For this reason, there is a risk that the assembly work will take time and the cleaning cost will increase. In the sliding bearing of Patent Document 2, the labyrinth is used to seal the inner gap between the upper and lower cases. Since the sealing means is used, the protection against the intrusion of dust, muddy water and the like from the gap on the inner peripheral side is slightly inferior to the elastic sealing means. Since the elastic sealing means for sealing the gaps on the inner and outer peripheral sides is arranged on the outer surface of the lower case, there is a risk that the elastic sealing means will fall off the lower case during long-term use. Cage, none of the sliding bearing, manufacturing costs, do not yet satisfactory with respect to durability and sealing property.

  The present invention has been made in view of the above-described points, and the object of the present invention is to reliably prevent intrusion of dust and the like into the sliding surface, and to provide sliding characteristics resulting from the intrusion of dust and the like. This reduces the time required for assembly work and does not easily drop off due to vibrations, etc., thus improving the manufacturing cost, durability and sealing performance, and at the time of steering operation. An object of the present invention is to provide a synthetic resin sliding bearing capable of maintaining smooth steering over a long period of time.

The synthetic resin sliding bearing of the present invention includes an annular upper case base portion having an annular lower surface in the axial direction, and an inner peripheral side cylinder suspended from a radially inner peripheral end portion of the annular lower surface of the upper case base portion. An upper case made of a synthetic resin integrally having a cylindrical hanging portion on the outer peripheral side hanging from the outer peripheral end portion in the radial direction of the annular lower surface of the hanging portion and the upper case base, and an axial center around the upper case The lower case base is overlapped with the upper case so as to be freely rotatable, and has an annular upper surface in the axial direction, and the annular upper surface of the lower case base faces the annular lower surface of the upper case base. A lower case made of a synthetic resin, each having an annular projection protruding integrally, and an annular lower surface and inner circumference of the upper case base with an annular upper surface in the axial direction and a cylindrical inner circumferential surface in the radial direction Side cylinder While slidably contacting the lower radial outer peripheral surface, the annular lower surface in the axial direction and the cylindrical outer peripheral surface in the radial direction, the annular upper surface in the axial direction of the annular protrusion and the inner cylindrical shape in the radial direction An annular space between the annular lower surface of the upper case base and the annular upper surface of the annular projection of the lower case base, and the outer circumferential surface of the inner peripheral cylindrical hanging portion and the cylindrical interior of the annular projection so as to contact the peripheral surface Synthetic resin sliding bearing pieces arranged in the annular space between the peripheral surfaces, and on the radially inner periphery side, there is a gap between the inner case side cylindrical hanging part of the upper case and the annular protrusions of the lower case base. to close, the inner circumferential side annular seal portion of the flexible contact with the outer peripheral surface of the radial direction of the inner peripheral-side cylindrical suspended portion of the upper case, the outer peripheral side in the radial direction, the outer peripheral side cylindrical upper case The upper case should be closed so as to close the gap between the ring-shaped protrusions of the hanging part and the lower case base. Each has a flexible outer circumferential side annular seal portion that contacts the radially inner circumferential surface of the circumferential cylindrical hanging portion, and a connecting portion that interconnects the inner circumferential side annular seal portion and the outer circumferential side annular seal portion. A synthetic resin sealing member, and the inner annular seal portion and the outer annular seal portion are arranged in a plurality of holes on the annular upper surface of the annular protrusion of the lower case base. It is integrally formed with a connecting part having a columnar part.

  According to the synthetic resin sliding bearing of the present invention, the inner circumferential side annular seal portion and the outer circumferential side annular seal portion are arranged in a plurality of holes formed in the annular upper surface of the annular projection of the lower case base. Since it is integrally formed with the connecting part having the columnar part, the number of parts can be reduced, the manufacturing cost can be reduced, and the possibility of dropping off can be eliminated, and the durability can be improved. The inner circumferential side annular seal portion for closing the gap between the cylindrical surface portion of the inner circumferential side cylindrical hanging portion of the upper case and the annular projection of the lower case base on the inner circumferential side and the outer circumferential side in the radial direction; Since it has the outer peripheral side annular seal part which closes the clearance gap between the outer peripheral cylindrical surface part of the outer periphery side cylindrical hanging part of an upper case, and the annular protrusion of a lower case base, a sealing performance can further be improved.

  In a preferred example of the synthetic resin sliding bearing of the present invention, the inner circumferential side annular seal portion is formed of a plurality of protrusions integrally formed along the circumferential direction on the cylindrical inner surface of the annular projection of the lower case base. An inner circumferential seal base that is joined to the cylindrical inner surface of the annular projection, and is connected to the inner circumferential end of the inner circumferential seal base in the radial direction. A flexible inner peripheral seal portion that elastically bends and contacts the outer peripheral surface of the cylindrical hanging portion, and the inner peripheral seal portion has a thickness smaller than the thickness of the inner peripheral seal base portion. At the same time, it extends obliquely downward from the outer peripheral end connected to the inner peripheral end of the inner peripheral seal base.

  Further, the outer peripheral side annular seal portion includes an outer peripheral surface continuous to an annular flat surface portion of an outer peripheral edge of the annular protrusion of the lower case base, and a plurality of protrusions integrally formed on the outer peripheral surface along the circumferential direction. And an annular outer peripheral seal base joined to the outer peripheral surface, and a flexible member that is connected to the outer peripheral seal base and elastically flexibly contacts the inner peripheral surface of the trapezoidal cross-section cylindrical portion of the outer cylindrical hanging portion. The outer peripheral seal portion has a thickness smaller than the thickness of the outer peripheral seal base portion and is connected to the outer peripheral end portion of the outer peripheral seal base portion. It is good to extend diagonally downward from the part.

  In a preferred example, each of the plurality of hole portions is a cut between a plurality of curved projections erected along the circumferential direction at the outer peripheral edge portion of the annular upper surface of the annular protrusion of the lower case base. The annular projecting portion of the coupling lower case base is located on the outer peripheral side that opens radially outward at one end on the radially outer side and opens in the hole at the other end radially inward. And a concave groove on the inner peripheral side that is open at the radially outer end and a radially inner end at the radially inner end. In the radially inward direction, it is integrally formed with the columnar portion, while in the radially outward direction, it is integrally formed with the outer peripheral side annular seal portion and the outer connecting portion disposed in the outer peripheral concave groove, On the outer side, it is integrally formed with the columnar part, while on the inner side in the radial direction, it is integrally formed with the inner circumferential annular seal part and on the inner periphery. Of which comprises an inner connecting portion arranged in the groove.

  The upper case may have an annular pedestal portion that is integrally formed at the radial center of the annular upper surface in the axial direction of the upper case base.

  In one preferred example, the inner circumferential cylindrical hanging portion is formed by a thick cylindrical portion connected to the radial inner peripheral end of the annular lower surface of the upper case base at the upper end portion in the axial direction, and an upper end portion in the axial direction. It is connected to the lower end in the axial direction of the thick cylindrical portion and has a thin cylindrical portion that is thin relative to the thick cylindrical portion, and the inner annular seal portion is a cylindrical shape in the radial direction of the thin cylindrical portion. The cylindrical hanging portion on the outer peripheral side is connected to the radial outer peripheral end of the annular lower surface of the upper case base at the upper end in the axial direction and is circular on the upper case base in the axial direction. It has a trapezoidal cross-section cylindrical part having an inner peripheral surface that is enlarged as it is away from the annular lower surface, and a cylindrical part connected to the lower end in the axial direction of the trapezoidal cross-section cylindrical part. It is in contact with the cylindrical part.

  The slide bearing piece has an annular upper surface that slidably contacts the annular lower surface of the upper case base and an annular lower surface that contacts the annular upper surface of the annular projection of the lower case base. The thrust sliding bearing piece of the inner casing and the outer circumference of the cylindrical hanging part on the inner peripheral side of the upper case base are integrally formed at one end extending from the one end of the thrust sliding bearing piece at one end. A cylindrical radial sliding bearing piece having an annular inner surface that slidably contacts the surface and an annular outer surface that contacts an inner peripheral surface of the annular protrusion of the lower case base, and a thrust slide It protrudes radially outward from the outer peripheral surface of the bearing piece portion, and outside the annular upper surface of the annular protrusion of the lower case base in the circumferential direction so that the sliding bearing piece does not rotate circumferentially with respect to the lower case. Stands along the outer periphery at the periphery And a plurality of curved protrusions plurality of radially protruding plate piece disposed in between may be equipped that.

  The thrust slide bearing piece is formed in an annular groove provided on the inner peripheral side of the annular upper surface, and is opened at one end of the annular groove while opening at the outer peripheral surface thereof at the other end. A plurality of radial grooves provided at equal intervals in the circumferential direction on the upper surface, and the radial sliding bearing piece portions are opened at both ends and are circumferentially formed on the annular inner surface. Even if it has a plurality of axial grooves that are spaced apart at equal intervals, on the other hand, the upper surface of the ring is along the circumferential direction, and at least the inner row and the outer row are radially arranged. It has a plurality of inner recesses and outer recesses formed in two rows, and the radial sliding bearing piece is open at both ends and is provided at equal intervals in the circumferential direction on the annular inner surface. A plurality of axial grooves may be provided.

  In a preferable example, the inner circumferential side annular seal portion and the outer circumferential side annular seal portion are insert-molded together with the connecting portion into the annular projecting portion of the lower case base.

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

  The synthetic resin that forms the upper case may be a thermoplastic synthetic resin such as polyacetal resin, polyamide resin, or polybutylene terephthalate resin, and the synthetic resin that forms the lower case is reinforced with glass fiber, carbon fiber, or the like. It may be a thermoplastic synthetic resin such as polyacetal resin, polyamide resin or polybutylene terephthalate resin containing fibers, and the synthetic resin forming the sliding bearing piece is polyacetal resin, polyamide resin, polybutylene terephthalate resin, polyethylene resin A thermoplastic synthetic resin such as a polyolefin resin may be used, and a polyurethane resin, a polyester elastomer, and the like can be given as preferable examples of the synthetic resin forming the sealing member.

  According to the present invention, it is possible to reliably prevent dust and the like from entering the sliding surface, without causing deterioration of sliding characteristics due to the entry of dust and the like, and to shorten the time for assembly work. Provided with a synthetic resin sliding bearing that can be easily dropped due to vibration, etc., and thus can improve manufacturing cost, durability and sealability, and can maintain smooth steering during steering operation for a long period of time. can do.

FIG. 1 is a cross-sectional explanatory view taken along the line I-I shown in FIG. 3 of a preferred example of an embodiment of the present invention. FIG. 2 is an explanatory front view of the example shown in FIG. FIG. 3 is an explanatory plan view of the example shown in FIG. FIG. 4 is a partially enlarged cross-sectional explanatory view of the example shown in FIG. FIG. 5 is a partially enlarged cross-sectional explanatory view of the example shown in FIG. FIG. 6 is an explanatory plan view of the upper case of the example shown in FIG. 7 is a cross-sectional explanatory view taken along the line VII-VII of the upper case shown in FIG. 6 of the example shown in FIG. 8 is a partially enlarged cross-sectional explanatory view of the upper case shown in FIG. 7 of the example shown in FIG. FIG. 9 is an explanatory plan view of the lower case of the example shown in FIG. FIG. 10 is a cross-sectional explanatory view taken along the line XX of the lower case shown in FIG. 9. FIG. 11 is a partially enlarged cross-sectional explanatory view of the lower case shown in FIG. 12 is an enlarged cross-sectional explanatory view taken along the line XII-XII of the lower case shown in FIG. 9. FIG. 13 is a partially enlarged plan view of the lower case shown in FIG. 14 is a partially enlarged plan explanatory view of the lower case shown in FIG. 15 is a cross-sectional explanatory view taken along the line XV-XV of the lower case shown in FIG. 13. 16 is a cross-sectional explanatory view taken along the line XVI-XVI of the lower case shown in FIG. 9. 17 is a cross-sectional explanatory view taken along the line XVII-XVII of the plain bearing piece shown in FIG. FIG. 18 is an explanatory plan view of the plain bearing piece of the example shown in FIG. FIG. 19 is an explanatory bottom view of the slide bearing piece of the example shown in FIG. 20 is a cross-sectional explanatory view taken along the line XX-XX of the plain bearing piece shown in FIG. 21 is an enlarged explanatory view taken along the line XXI-XXI of the plain bearing piece shown in FIG. 22 is an explanatory plan view of the seal member of the example shown in FIG. 23 is a cross-sectional explanatory view taken along the line XXIII-XXIII of the seal member shown in FIG. FIG. 24 is a perspective explanatory view of a lower case provided with the seal member of the example shown in FIG. FIG. 25 is an explanatory plan view of the lower case provided with the seal member of the example shown in FIG. 26 is a cross-sectional explanatory view taken along the line XXVI-XXVI of the lower case including the sealing member shown in FIG. 27 is a cross-sectional explanatory view taken along the line XXVII-XXVII of the lower case including the sealing member shown in FIG. FIG. 28 is a partially enlarged cross-sectional explanatory view of the lower case provided with the seal member shown in FIG. FIG. 29 is a partially enlarged plan view of the lower case provided with the seal member shown in FIG. 30 is a cross-sectional explanatory view taken along the line XXX-XXX of the lower case provided with the seal member shown in FIG. 25. 30 is a cross-sectional explanatory view taken along the line XXXI-XXXI shown in FIG. 32 of another embodiment of the slide bearing piece of the example shown in FIG. 32 is an explanatory plan view of the plain bearing piece shown in FIG. FIG. 33 is an explanatory bottom view of the plain bearing piece shown in FIG. FIG. 34 is a partially enlarged cross-sectional explanatory view of the sliding bearing piece shown in FIG. FIG. 35 is a partially enlarged cross-sectional explanatory view of the sliding bearing piece shown in FIG. 36 is a cross-sectional explanatory view taken along the line XXXVI-XXXVI of the plain bearing piece shown in FIG. 32. FIG. 37 is a cross-sectional explanatory view in which the plain bearing shown in FIG. 1 is incorporated into a strut suspension.

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

  1 to 5, a sliding bearing 1 of this example for use in a strut suspension in a four-wheeled vehicle includes an upper case 2 made of synthetic resin fixed to the vehicle body side via an attachment member, and an upper case 2. On the other hand, a synthetic resin lower case 3 which is superposed on the upper case 2 so as to be rotatable in the circumferential direction R around the axis O and has a spring seat surface for a suspension coil spring formed thereon. , A synthetic resin sliding bearing piece 5 disposed in the annular space 4 between the upper case 2 and the lower case 3, and a diameter between the upper case 2 and the lower case 3 respectively communicating with the annular space 4 at one end of the annular shape. And a synthetic resin seal member 8 for closing the other annular end communicating with the outside of the inner circumferential gap 6 and the outer circumferential gap 7 in the direction X.

  The upper case 2 includes an annular upper case base 10 having an annular lower surface 9 in the axial direction Y, and a radial direction X of the annular lower surface 9 of the upper case base 10 as shown in detail in FIGS. An inner peripheral cylindrical drooping portion 12 that hangs down from the inner peripheral end portion 11 of the upper case base, an outer peripheral cylindrical drooping portion 14 that hangs down from the outer peripheral end portion 13 in the radial direction X of the annular lower surface 9 of the upper case base portion 10, and an upper case base portion. Each of the ten annular upper surfaces 15 integrally has an annular pedestal portion 16 that projects from the central portion in the radial direction X.

  The inner peripheral cylindrical hanging portion 12 includes a thick cylindrical portion 18 connected to the inner peripheral end portion 11 of the annular lower surface 9 of the upper case base 10 at the upper end portion 17, an inner peripheral stepped annular surface 19 and an outer periphery. The upper cylindrical portion 18 is connected to the lower end portion 21 of the thick cylindrical portion 18 via the side step annular surface 20 and has a thin cylindrical portion 23 that is thinner than the thick cylindrical portion 18.

  The thick cylindrical portion 18 and the thin cylindrical portion 23 have cylindrical inner peripheral surfaces 25 and 26 that define through holes 24 through which the shaft member of the strut suspension passes, and the thick cylindrical portion 18 has a cylindrical shape. The thin-walled cylindrical portion 23 has a smaller diameter than the outer peripheral surface 27, and has a frustoconical outer peripheral surface 29 that tapers from the outer peripheral stepped annular surface 20 to the annular end surface 28. Have.

  An outer peripheral cylindrical hanging portion 14 having a cylindrical outer peripheral surface 30 is connected to the outer peripheral end portion 13 of the annular lower surface 9 of the upper case base 10 at the upper end portion 31 and from the annular lower surface 9 of the upper case base 10. Each of which has a trapezoidal cross-section cylindrical portion 33 having an inner peripheral surface 32 whose diameter is increased as it is separated from each other, and a cylindrical portion 36 connected to the lower end portion 35 of the trapezoidal cross-section cylindrical portion 33 at the upper end portion 34. The annular end surface 37 of 36 is located below the annular end surface 28 of the thin cylindrical portion 23 of the inner circumferential cylindrical hanging portion 12 in the axial direction Y.

  The lower case 3 includes an annular lower case base 39 having an annular upper surface 38 and an upper surface in the axial direction Y from the annular upper surface 38 of the lower case base 39, as shown in detail in FIGS. An annular projection 40 projecting toward the bottom, a cylindrical portion 43 projecting downward from the annular lower surface 41 in the axial direction Y to the inner peripheral portion 42 of the annular lower surface 41 of the lower case base 39, and An annular projecting portion 46 projecting inward in the radial direction X from the cylindrical inner peripheral surface 45 of the cylindrical portion 43 at the end portion 44, and projecting downward in the axial direction Y at the end portion 44 of the cylindrical portion 43. The annular protrusion 47 and the outer periphery of the annular upper surface 48 of the annular protrusion 40 protrude upward in the axial direction Y leaving the annular flat surface portion 49 and the circumference around the axis O A plurality of curved shapes standing apart from each other in the direction R Integrally it has a raised portion 50.

  The annular protrusion 40 is connected to the cylindrical outer peripheral surface 51 connected to the annular flat surface portion 49 of the annular upper surface 48, the annular step surface 52 connected to the outer peripheral surface 51, and the step surface 52. And an outer peripheral cylindrical surface 53 extending downward in the axial direction Y beyond the annular upper surface 38 and an annular projecting surface 55 positioned outward in the radial direction X from the lower end portion 54 of the outer peripheral cylindrical surface 53. The annular projecting surface 55 is on the one hand on the lower end portion 54 of the outer cylindrical surface 53 via the annular upper surface 56 and the arcuate concave surface 57, and on the other hand on the annular lower surface 41 via the annular tapered surface 55a. It is connected.

  On the outer peripheral surface 51 of the annular protrusion 40, a plurality of protrusions 58 having a planar view shape are integrally formed along the circumferential direction R. The protrusions 58 are formed in an annular step surface 52. The upper end surface 59 of the protrusion 58 is connected to the annular flat surface portion 49 of the annular upper surface 48 via the outer peripheral surface 51, and the outer surface 60 of the protrusion 58 is The outer cylindrical surface 53 has a smaller diameter than the outer diameter.

  The annular projecting portion 40 is provided with a reduced diameter cylindrical portion 64 having an inner peripheral surface 64a on the inner peripheral surface 62 connected to the annular upper surface 48. The upper surface 38 is connected to the cylindrical inner peripheral surface 45 of the cylindrical portion 43 through an annular notch step surface 65.

  A plurality of projections 66 having a planar view shape are integrally formed along the circumferential direction R on the inner peripheral surface 64a of the reduced diameter cylindrical portion 64 of the annular projection 40. The upper end surface 67 of the projection 66 extends from the annular upper surface 38 toward the upper side in the axial direction Y. The upper end surface 67 of the projection 66 is formed on the inner peripheral surface 62 via the inner peripheral surface 64 a and the annular step surface 63 of the reduced diameter cylindrical portion 64. It is connected.

  A plurality of holes 68 are formed in the annular upper surface 48 of the annular protrusion 40 along the circumferential direction R toward the lower side in the axial direction Y. The holes 68 are formed from the circular openings 69. It has a frustoconical shape that tapers to the bottom surface 70 that defines the hole 68, and the inner surface 71 that defines the hole 68 has a frustoconical surface. These hole portions 68 are provided in order to make the thickness of the annular protrusion 40 of the lower case 3 and the thickness of other portions uniform, and to reduce defects such as sink marks during molding as much as possible. .

  Of the plurality of holes 68, a hole formed in the annular upper surface 48 located at the cut 72 between the curved protrusions 50 erected along the circumferential direction R on the outer peripheral edge of the annular upper surface 48. An annular protrusion 40 on the periphery of the circular opening 69a of 68a has a pair of semicircular recesses 73 facing each other in the shallow circumferential direction R surrounding the circular opening 69a, and inward in the radial direction X. A pair of inner radial recesses 74 that are continuous with the semicircular recess 73 and open at the inner peripheral surface 62 and face each other in the circumferential direction R having the same depth as the semicircular recess 73, and a semicircle outward in the radial direction X A pair of outer diameters that are continuous with the recess 73 and are closed outside in the radial direction X by the closing portion 76 of the annular protrusion 40 and facing each other in the circumferential direction R having the same depth as the semicircular recess 73. Directional recess 77, semicircular recess 73, inner diameter It is located below the bottom surface 78 of the directional recess 74 and the outer radial recess 77 in the axial direction Y, passes through the intermediate portion of the protrusion 58 and opens at the outer surface 60 of the protrusion 58 outward in the radial direction X. On the other hand, on the inner side in the radial direction X, a concave groove 79 on the outer peripheral side communicating with the hole 68 a is formed, and the concave groove 79 is located below the bottom surface 78 in the axial direction Y. And a pair of wall surfaces 81 facing each other in the circumferential direction R. Each of the wall surfaces 81 includes an inner peripheral edge 82 and an outer peripheral edge 83, and the inner peripheral edge 82 is The outer peripheral edge 83 is connected to the outer surface 60, and is connected to the inner surface 71 defining the hole 68 a.

  At the periphery of the circular opening 69a of the hole 68a, the annular protrusion 40 is further located below the bottom surface 78 of the inner radial recess 74 in the axial direction Y and from the hole 68a side in the radial direction X. A notch groove 83a that extends inwardly, and a bottom surface 88 that is connected to a bottom surface 86 that defines the notch groove 83a via a stepped surface 87 and is open at an inner surface 89 of the protrusion 66. The opening groove 83b communicates with the opening groove 83b on the side surface in the circumferential direction R and opens on the inner circumferential surface 62 inward in the radial direction X, while on the inclined surface 94 outward in the radial direction X, the axial direction Below Y, each is defined by an annular step surface 63, and a pair of notch grooves 84 facing each other in the circumferential direction R are formed, and the notch groove 83a is formed in the radial direction X. It communicates with the hole 68a outside.

  Each of the pair of wall surfaces 92 of the annular protrusions 40 facing each other in the circumferential direction R defining the notch groove 83a and the opening groove 83b includes an inner peripheral edge 93 and an outer peripheral edge 95. The inner peripheral edge 93 is connected to an inclined surface 94 that defines the notch groove 84, and the outer peripheral edge 95 is connected to the inner surface 71 that defines the hole 68 a. Are inclined so that the width in the radial direction X increases as the notch groove 84 moves upward in the axial direction Y.

  In this way, the annular protrusion 40 has an outer surface 60 at the outer end in the radial direction X and outward in the radial direction X, an inner end in the radial direction X at the hole 68a, and the radial direction. A groove 79 that opens upward in the axial direction V from one outer end of X to the other inner end in the radial direction X, and a hole 68a at the outer end in the radial direction X are formed in the radial direction. At the other inner end of X, an inner surface 89 opens inward in the radial direction X, and opens from the outer side in the radial direction X to the inner other end in the radial direction X and above in the axial direction Y. And a notch groove 83a and an inner groove 83c formed of an opening groove 83b.

  The sliding bearing piece 5 made of synthetic resin disposed in the annular space 4 has an annular upper surface that slidably contacts the annular lower surface 9 of the upper case base 10 as shown in detail in FIGS. 97 and an annular thrust slide bearing piece 99 each having an annular lower surface 98 that contacts the annular upper surface 48 of the annular projection 40 of the lower case base 39, and a thrust slide bearing at one end of the annular shape. An annular shape that is integrally formed with one annular end of the piece 99 and that slidably contacts the outer peripheral surface 27 of the thick cylindrical portion 18 of the inner cylindrical hanging portion 12 of the upper case base 10. A cylindrical radial plain bearing piece 102 that has an annular outer surface 101 that contacts the inner peripheral surface 62 of the annular protrusion 40 of the inner case 100 and the lower case base 39 and extends downward in the axial direction Y; The outer peripheral surface 103 of the thrust slide bearing piece 99 The outer peripheral edge of the annular upper surface 48 of the annular protrusion 40 of the lower case base 39 in the circumferential direction R so that the sliding bearing piece 5 does not rotate in the circumferential direction R with respect to the lower case 3. And a plurality of radially projecting plate pieces 104 sandwiched between adjacent projections 50 and disposed at cuts 72 between a plurality of curved projections 50 erected along the portion. .

  The thrust slide bearing piece 99 has an annular groove 105 provided on the inner peripheral side of the annular upper surface 97, and opens at one end of the annular groove 105, and opens at the outer peripheral surface 103 at the other end. And a plurality of radial grooves 106 provided at equal intervals in the circumferential direction R on the upper surface 97, and the radial sliding bearing piece 102 is open at both ends to form an annular inner ring The side surface 100 has a plurality of axial grooves 107 provided at equal intervals in the circumferential direction R. These annular grooves 105, radial grooves 106, and axial grooves 107 are made of grease or the like. It is a reservoir for lubricant.

  As shown in detail in FIGS. 4 and 5 and FIGS. 22 to 30 in particular, the seal member 8 includes a thin cylindrical portion 23 and a lower portion which are axial end portions 108 of the inner peripheral cylindrical hanging portion 12 of the upper case base 10. Flexibility to elastically flexure contact with the frustoconical outer peripheral surface 29 of the thin cylindrical portion 23 of the inner peripheral cylindrical hanging portion 12 so as to close the gap 6 between the inner peripheral end portions 109 of the case base 39. The outer peripheral side cylindrical seal 110 and the outer peripheral side cylinder so as to close the gap 7 between the axial end 111 of the outer peripheral cylindrical hanging part 14 of the upper case base 10 and the outer peripheral end 112 of the lower case base 39. A flexible outer peripheral side annular seal portion 113 that elastically bends and contacts the inner peripheral surface 32 of the trapezoidal cross section cylindrical portion 33 of the drooping portion 14, an inner peripheral side annular seal portion 110 disposed on the inner peripheral side, and an outer peripheral side The outer peripheral side annular seal part 113 arranged on each other is connected to each other A plurality of and a connecting portion 115 that.

  The inner circumferential side annular seal portion 110 is formed of a plurality of integrally formed on the reduced diameter cylindrical portion 64 of the annular projection 40 protruding upward from the annular upper surface 38 of the lower case base 39 in the axial direction X. An annular inner peripheral seal base 116 integrally covering the reduced diameter cylindrical portion 64 and covering the outer surface of the projection 66 having a planar view shape is connected to the inner peripheral seal base 116 and the inner periphery. And an annular flexible inner peripheral seal portion 117 that elastically contacts the frustoconical outer peripheral surface 29 of the thin cylindrical portion 23 of the side cylindrical hanging portion 12.

  The inner peripheral seal portion 117 has a thickness smaller than that of the inner peripheral seal base portion 116 and extends inward in the radial direction X from the inner peripheral end portion 118 of the inner peripheral seal base portion 116 and extends obliquely downward. Yes.

  The outer circumferential side annular seal 113 is formed by the outer circumferential surface 51 of the annular projection 40 projecting upward in the axial direction X from the annular upper surface 38 of the lower case base 39, the upper end surface 59 of the projection 58, and the projection 58. An annular outer peripheral seal base 119 that covers the inner peripheral side of the outer surface 60 and the stepped surface 52 and is integrally joined to the outer peripheral surface 51, and is connected to the outer peripheral seal base 119 and is also connected to the outer peripheral cylindrical hanging portion 14. An annular outer peripheral seal portion 120 that elastically bends and contacts the inner peripheral surface 32 of the trapezoidal cross-section cylindrical portion 33 is provided.

Seal portion 120 extends diagonally downward a is towards the outside from the outer peripheral end portion 121 in the radial direction X of the outer peripheral seal base 119 with has a smaller thickness than the thickness of the outer peripheral seal base 119.

  The outer peripheral seal portion 120 may cover the annular flat surface portion 49.

  Each of the connecting portions 115 is integrally formed with the columnar portion 115a filled in the hole 68a formed in the annular upper surface 48 located in the cut 72 and the columnar portion 115a inside in the radial direction X, while the radial direction On the outer side of X, it is integrally formed with the outer seal base 119 and is formed integrally with the outer connecting portion 115b disposed in the concave groove 79, and on the outer side of the radial direction X with the columnar portion 115a. Inside X, it is formed integrally with the inner peripheral seal base 116 and has an inner connecting portion 115c disposed in a concave groove 83c made up of a cutout concave groove 83a and an opening groove 83b, and a columnar portion 115a. Covers the bottom surface 70 and the inner surface 71 and is joined to the bottom surface 70 and the inner surface 71, and the outer connecting portion 115 b is formed of a pair of wall surfaces 81 and a pair of annular protrusions 40 that define the concave groove 79 facing each other. Covering the bottom surface 80 is joined to the wall surface 81 and bottom surface 80, the inner connection portion 115c, the bottom surface 86 over the bottom surface 86, bottom surface 88 and wall 92, is joined to the bottom surface 88 and wall 92.

  The inner circumferential side annular seal portion 110 and the outer circumferential side annular seal portion 113 are insert-molded in the annular protrusion 40 of the lower case base 39 together with the coupling portion 115 having the columnar portion 115a, and thus a plurality of coupling portions are formed. Each of the portions 115 is integrally connected to the inner circumferential side annular seal 110 at the inner side coupling portion 115c as one end portion and integrally connected to the outer circumferential side annular seal portion 113 at the outer side coupling portion 115b as the other end portion by insert molding. Yes.

  The above-described plain bearing 1 is configured so that the relative rotation in the circumferential direction R of the lower case 3 with respect to the upper case 2 is caused by the upper surface 97 of the thrust slide bearing piece 99 and the thick cylindrical portion 18 with respect to the annular lower surface 9 of the upper case base 10. The inner surface 100 of the radial sliding bearing piece 102 is allowed to slide relative to the outer peripheral surface 27 in the circumferential direction R.

  According to such a sliding bearing 1, each of the plurality of connecting portions 115 is integrally connected to the inner circumferential annular seal 110 at one end and integrally formed with the outer circumferential annular seal 113 at the other end by insert molding. Therefore, the number of parts can be reduced, the assemblability can be improved, the manufacturing cost can be reduced, and the possibility of dropping off can be eliminated, and the durability can be improved.

  In addition, according to the sliding bearing 1, the seal member 8 closes the gap 6 between the inner peripheral side cylindrical hanging portion 12 of the upper case 2 and the inner peripheral end portion 109 of the lower case 3. And the outer peripheral side cylindrical hanging portion 14 of the upper case 2 and the outer peripheral side annular seal portion 113 that closes the gap 7 between the outer peripheral end portions 112 of the lower case 3 can improve the sealing performance. it can.

  By the way, as shown in FIGS. 31 to 36, the annular upper surface 97 slidably contacting the annular lower surface 9 of the upper case base 10 and the annular upper surface 48 of the annular projection 40 of the lower case base 39 are contacted. An annular thrust slide bearing piece 99 having an annular lower surface 98 respectively formed on one end of the thrust slide bearing piece 99 at one end and the thick wall of the upper case 2 A shaft having an annular inner surface 100 slidably contacting the outer peripheral surface 27 of the cylindrical portion 18 and an annular outer surface 101 contacting the inner peripheral surface 62 of the annular protrusion 40 of the lower case base 39. A cylindrical radial sliding bearing piece 102 extending downward in the direction Y and the outer circumferential surface 103 of the thrust sliding bearing piece 99 project outward and the sliding bearing piece 5 is circumferential with respect to the lower case 3. Do not rotate to R In the circumferential direction R, the projections arranged adjacent to each other at the cut 72 between the plurality of curved projections 50 erected along the outer peripheral edge of the annular upper surface 48 of the annular projection 40 of the lower case base 39. In the synthetic resin sliding bearing piece 5 having a plurality of radially projecting plate pieces 104 sandwiched by the portion 50, the thrust sliding bearing piece 99 is formed on the annular upper surface 97 in the circumferential direction R. A plurality of inner recesses 122 and outer recesses 123 may be formed along at least two inner rows and outer rows along the radial direction.

  Each of the inner recesses 122 formed in the inner row has an inner arcuate surface 124 centered on the axis O, an outer arcuate surface 125 radially expanded, an inner arcuate surface 124 and an outer arcuate shape. It is prescribed | regulated by the circular-arc-shaped surfaces 126 and 126 which couple | bond the both ends with the surface 125. FIG.

  The outer recesses 123 formed in the outer row include an inner arcuate surface 127 centered on the axis O, an outer arcuate surface 128 that is radially expanded, an inner arcuate surface 127, and an outer arcuate surface 128. Are defined by arcuate surfaces 129 and 129, and the outer recesses 123 are arranged at positions corresponding to the respective cuts 130 in the circumferential direction R between the inner recesses 122 formed in the inner row. Yes.

  The small circular portions 130a arranged at intervals of 60 ° along the circumferential direction R indicate the positions of the protruding pins when the slide bearing 1 is formed, and are not arranged in the inner concave portion 122.

  A radial plain bearing piece 102 shown in FIGS. 31 to 36 is also opened at both ends in the axial direction Y, and is provided with a plurality of axial directions provided on the annular inner surface 100 at equal intervals in the circumferential direction R. A groove 107 may be provided.

  A plurality of inner recesses 122 and outer recesses 123 arranged in the circumferential direction R on the annular upper surface 97 of the thrust slide bearing piece 99 and in at least two rows of the inner row and the outer row in the radial direction, and the axial direction The groove 107 serves as a reservoir for lubricating oil such as grease.

  According to the sliding bearing 1 having the sliding bearing piece 5 shown in FIGS. 31 to 36, the seal member 8 has a gap between the inner peripheral side cylindrical hanging portion 12 of the upper case 2 and the inner peripheral end portion 109 of the lower case 3. 6, and an outer peripheral side annular seal portion 113 for closing the gap 7 between the outer peripheral side cylindrical hanging portion 14 of the upper case 2 and the outer peripheral end portion 112 of the lower case 3. Therefore, the sealing performance can be improved, and the lubricating oil such as grease filled in the inner concave portion 122 and the outer concave portion 123 is applied to the annular lower surface 9 of the upper case base 10 and the upper surface of the thrust slide bearing piece 99. Therefore, an increase in steering force can be prevented.

  For example, as shown in FIG. 37, an annular pedestal 16 on the annular upper surface 15 of the upper case 2 of the slide bearing 1 is brought into contact with the vehicle body side seating surface 132 of the mounting member 131 on the strut type suspension. An annular lower surface 41 of the lower case 3 as a spring seat surface 134 of the sliding bearing 1 is brought into contact with the upper end portion of the suspension coil spring 133 so that the synthetic resin sliding bearing 1 of the present example is attached to the mounting member 131 on the vehicle body side. The sliding bearing 1 made of the synthetic resin of this example may be applied to a strut type suspension in a four-wheeled vehicle by arranging it between the vehicle body side seating surface 132 and the suspension coil spring 133.

  In the strut type suspension shown in FIG. 37, the relative rotation in the circumferential direction R of the suspension coil spring 133 with respect to the mounting member 131 on the vehicle body side causes the thrust sliding bearing piece 99 with respect to the annular lower surface 9 of the upper case base 10 of the sliding bearing 1. Are allowed to slide relative to each other in the circumferential direction R of the inner surface 100 of the radial sliding bearing piece 102 with respect to the upper surface 97 and the outer peripheral surface 27 of the thick cylindrical portion 18.

DESCRIPTION OF SYMBOLS 1 Sliding bearing 2 Upper case 3 Lower case 4 Annular space 5 Sliding bearing piece 6, 7 Clearance 8 Seal member 110 Inner peripheral side annular seal part 113 Outer peripheral side annular seal part 115 Connection part

Claims (7)

An upper case made of synthetic resin having an annular lower surface, a lower case base overlapped with the upper case so as to be rotatable about an axis relative to the upper case, and having an annular upper surface; A synthetic resin lower case having an annular projection protruding from the annular upper surface of the lower case base toward the annular lower surface of the upper case, and a synthetic resin slip disposed between the upper case and the lower case closing the bearing piece, the inner circumferential side annular seal portion of the flexible closing the gap in the inner peripheral side in the radial direction between the upper and lower cases, the gap at the outer side in the radial direction between the upper and lower cases Made of synthetic resin that integrally connects the flexible outer ring seal part, the inner ring seal part and the outer ring seal part with each other and the connecting part disposed in the groove of the lower case And comprising a sealing member, the inner circumferential side annular seal portion and the outer annular seal portion is integrally molded with the connecting portion having a columnar portion disposed in the hole of the annular upper surface of the annular projection The inner annular seal portion is a circle joined to the cylindrical inner surface of the annular projection so as to cover a plurality of projections integrally formed along the circumferential direction on the cylindrical inner surface of the annular projection. An annular inner peripheral seal base, and a flexible inner peripheral seal portion connected to a radially inner peripheral end of the inner peripheral seal base. A synthetic resin sliding bearing having a thickness smaller than the thickness of the seal base. The outer circumferential side annular seal portion covers the outer circumferential surface connected to the annular flat surface portion of the outer circumferential edge of the annular projection and a plurality of protrusions integrally formed on the outer circumferential surface along the circumferential direction. An annular outer peripheral seal base joined to the outer peripheral seal base, and a flexible outer peripheral seal portion connected to the outer peripheral seal base. The outer peripheral seal portion has a thickness smaller than the thickness of the outer peripheral seal base. A sliding bearing made of a synthetic resin according to claim 1. An upper case made of synthetic resin having an annular lower surface, a lower case base overlapped with the upper case so as to be rotatable about an axis relative to the upper case, and having an annular upper surface; A synthetic resin lower case having an annular projection protruding from the annular upper surface of the lower case base toward the annular lower surface of the upper case, and a synthetic resin slip disposed between the upper case and the lower case closing the bearing piece, the inner circumferential side annular seal portion of the flexible closing the gap in the inner peripheral side in the radial direction between the upper and lower cases, the gap at the outer side in the radial direction between the upper and lower cases Made of synthetic resin that integrally connects the flexible outer ring seal part, the inner ring seal part and the outer ring seal part with each other and the connecting part disposed in the groove of the lower case And comprising a sealing member, the inner circumferential side annular seal portion and the outer annular seal portion is integrally molded with the connecting portion having a columnar portion disposed in the hole of the annular upper surface of the annular projection The outer peripheral ring seal portion covers the outer peripheral surface connected to the annular flat surface portion of the outer peripheral edge of the annular protrusion and the plurality of protrusions integrally formed on the outer peripheral surface along the circumferential direction. An annular outer peripheral seal base joined to the surface, and a flexible outer peripheral seal portion connected to the outer peripheral seal base, the outer peripheral seal portion being smaller than the thickness of the outer peripheral seal base A plain bearing made of synthetic resin with a thickness. The connecting portion is integrally formed with the columnar portion radially inward, while being integrally formed with the outer peripheral annular seal portion radially outward and with the outer connecting portion disposed in the concave groove, On the outer side, it is integrally formed with the columnar part, and on the inner side in the radial direction, it is formed integrally with the inner circumferential side annular seal part and has an inner connecting part arranged in the groove. A synthetic resin sliding bearing according to any one of claims 1 to 3. The sliding bearing piece is an annular thrust sliding bearing piece having an annular upper surface that slidably contacts the annular lower surface of the upper case and an annular lower surface that contacts the annular upper surface of the annular projection. A cylindrical radial slide bearing piece extending axially downward from one end of the thrust slide bearing piece at one end and integrally formed at the one end, and an outer peripheral surface of the thrust slide bearing piece The synthetic resin sliding bearing according to any one of claims 1 to 4, further comprising a radially projecting plate piece projecting radially outward. The thrust slide bearing piece has an annular groove provided on the inner peripheral side of the annular upper surface, and a plurality of radial grooves provided at equal intervals in the circumferential direction on the annular upper surface. The radial sliding bearing piece portion has a plurality of axial grooves provided at equal intervals in the circumferential direction on the inner surface of the annular ring. A plain bearing made of synthetic resin. The thrust slide bearing piece has a plurality of inner recesses and outer recesses formed along the circumferential direction on the annular upper surface thereof and in the radial direction over at least two rows of the inner row and the outer row, 6. The synthetic resin sliding bearing according to claim 5, wherein the radial sliding bearing piece has a plurality of axial grooves provided at equal intervals in the circumferential direction on the inner surface of the ring. .

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