JP2015092113A - Thrust sliding bearing and fitting structure of strut-type suspension using the thrust sliding bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust sliding bearing that can resolve not only a problem of a mount space but also an economical problem by forming a radial slide bearing part in upper and lower cases without using a radial slide bearing to reduce the radial dimension thereof.SOLUTION: A thrust sliding bearing 1 includes: a synthetic resin lower case 2; a synthetic resin upper case 3 superposed to the lower case 2; and a synthetic resin thrust sliding bearing piece 4 disposed between the upper case 3 and the lower case 2.

Description

  The present invention relates to a thrust slide bearing made of synthetic resin, particularly a thrust slide bearing which is preferably incorporated as a thrust slide bearing of a strut type suspension (McPherson type) in a four-wheeled vehicle, and a mounting structure of a strut type suspension using this thrust slide bearing About.

  In general, a strut suspension is mainly used for a front wheel of a four-wheeled vehicle, and has a structure in which a coil spring is combined with a strut assembly in which a hydraulic shock absorber is incorporated in an outer cylinder integrated with a main shaft. Such a suspension includes (1) a structure in which the axis of the coil spring is positively offset with respect to the axis of the strut, and the piston rod of the shock absorber built in the strut smoothly slides. There is a structure in which the axis of the coil spring is arranged on the same axis with respect to the axis of the strut. In any suspension, when the strut assembly rotates together with the coil spring by a steering operation, a bearing is disposed between the mounting member of the vehicle body and the upper spring seat of the coil spring so as to allow the rotation smoothly. Yes.

  The bearing supports the vehicle body load (thrust load) and at the same time the radial load resulting from the suspension structure, that is, in the former structure, the axis of the coil spring is offset with respect to the axis of the strut. Even in the stationary state, the radial load caused by the restoring force of the coil spring in the axial direction of the strut, and in the latter structure, the strut axis and the coil spring axis are arranged on the same axis. The performance to smoothly allow the radial load caused by the misalignment caused by this is required.

JP 2002-257146 A JP 2004-225754 A

  As a thrust sliding bearing that smoothly allows the above thrust load and radial load, a synthetic resin lower case, a synthetic resin upper case superimposed on the lower case, and a synthetic resin placed between the upper and lower cases There has been proposed a thrust sliding bearing comprising a resin-made disc-shaped thrust sliding bearing piece and a synthetic resin radial bearing piece disposed between the upper and lower cases (Patent Document 1 and Patent Document 2). .

  However, there may be a case where there is no space for mounting radially outward between the vehicle body side mounting member on which the thrust slide bearing is disposed and the upper spring material sheet of the coil spring. In addition, there is an economic problem that the use of two bearings, a thrust slide bearing and a radial slide bearing, increases the price.

  The present invention has been made in view of the above-mentioned points. The object of the present invention is to reduce the radial dimension by forming a radial sliding bearing portion in the upper and lower cases without using a radial sliding bearing. Thus, an object of the present invention is to provide a thrust slide bearing that can solve the problem of the installation space and also solve the economical problem.

  The thrust sliding bearing of the present invention comprises a synthetic resin lower case, a synthetic resin upper case superimposed on the lower case, and a synthetic resin thrust sliding bearing piece disposed between the upper and lower cases. The lower case has an annular upper surface, an annular lower surface, a cylindrical small-diameter inner surface, a cylindrical large-diameter inner surface and a cylindrical outer surface disposed between the annular upper surface and the annular lower surface, and a first annular member on the annular upper surface. An annular base portion having a recess, a small-diameter hole that is defined by the cylindrical small-diameter inner surface of the annular base portion and that opens at the annular lower surface of the annular base portion, and the cylindrical large-diameter of the annular base portion A large-diameter hole that is defined by the inner surface and opens at the annular upper surface of the annular base portion, and is connected to the cylindrical small-diameter inner surface at the annular inner peripheral end and is connected to the cylindrical large-diameter inner surface at the annular outer peripheral end. Annular shoulder surface and cylindrical outer surface An annular projection projecting radially outward from the lower end, and a second inner surface provided on the annular upper surface of the annular projection and cooperating with the cylindrical outer surface and the annular upper surface of the annular projection on the cylindrical inner surface. A cylindrical projection that defines the annular recess, and an annular engagement projection that projects radially outward from the cylindrical outer surface of the cylindrical projection, and the upper case includes an annular substrate portion, An inner cylindrical suspension that is integrally provided on the cylindrical inner surface of the annular substrate portion so as to hang downward from the annular upper surface of the annular substrate portion and defines a central hole concentric with the small-diameter hole on the cylindrical inner surface. And a cylindrical outer surface of the annular substrate portion, and is provided integrally with the annular bottom surface of the annular substrate portion so as to extend downward from the annular lower end surface of the inner cylindrical suspension portion. A thick outer cylindrical hanging portion having a cylindrical inner surface, an annular lower surface of the annular substrate portion, and the inner cylindrical hanging portion A third annular recess defined by the cylindrical outer surface of the cylindrical portion and the cylindrical inner surface of the outer cylindrical hanging portion, an inner cylindrical standing wall portion erected downward from the annular lower end surface of the outer cylindrical hanging portion, and A fourth annular recess defined by an outer cylindrical standing wall portion, an annular lower end surface of the outer cylindrical hanging portion, a cylindrical outer surface of the inner cylindrical standing wall portion, and a cylindrical inner surface of the outer cylindrical standing wall portion; and an outer cylinder An annular engagement portion projecting downward from the annular lower end surface of the vertical wall portion, and an annular hook portion projecting radially inward from the cylindrical inner surface of the annular engagement portion. The annular upper surface is slidably brought into contact with the annular lower surface of the annular substrate portion defining the third annular recess, and is disposed on the third annular recess, while the annular lower surface is disposed on the first annular recess. It is slidably brought into contact with the bottom surface of the annular recess of the annular base body to be defined, and is arranged in the first annular recess. The annular lower surface of the annular substrate portion of the upper case is separated from the annular upper surface of the annular base portion of the lower case, and the upper case has an annular shoulder with a gap between the annular lower end surface of the inner cylindrical hanging portion. The cylindrical inner surface of the outer cylindrical hanging portion that is thicker than the inner cylindrical hanging portion in the radial direction is slidably brought into contact with the cylindrical outer surface of the annular base portion of the lower case, and the inner cylinder The vertical wall portion is disposed in the second annular recess, the annular hook portion is elastically fitted to the annular engagement protrusion, and a circle is formed on the inner surface of the cylindrical portion of the elastic fitting portion and the outer cylindrical hanging portion. The inner cylindrical standing wall portion disposed in the second annular recess and the cylindrical projection portion disposed in the fourth annular recess and the annular engagement between the cylindrical base portion of the annular base portion and the slidable contact portion It forms a sealing part by labyrinth action with the protrusion, and is superimposed on the lower case

  According to the thrust slide bearing of the present invention, the relative rotation between the upper case and the lower case is such that, with respect to the thrust load direction, the annular upper surface and the upper portion of the thrust slide bearing piece disposed in the first and third annular recesses. Allowed by smooth sliding with the annular lower surface of the annular substrate portion of the case, and in the radial load direction, the cylindrical inner surface of the outer cylindrical hanging portion of the upper case and the cylindrical outer surface of the annular base portion of the lower case It is allowed by smooth sliding.

  Further, according to the thrust slide bearing of the present invention, the annular upper surface of the thrust slide bearing piece and the annular substrate of the upper case permitting smooth sliding of the relative rotation between the upper case and the lower case in the thrust load direction. Since the thrust slide bearing portion composed of the annular lower surface of the portion is positioned above the sealing portion by the labyrinth action and the annular upper surface of the lower case, dust from the inner and outer peripheral surfaces to the thrust slide bearing portion Intrusion of foreign matter such as the above is avoided as much as possible, and troubles such as abnormal wear of the thrust slide bearing due to the entry of the foreign matter can be avoided, and the upper case and the lower case with respect to the radial load direction can be avoided. Peripheral surface to the radial sliding bearing part consisting of the cylindrical inner surface of the outer cylindrical hanging part of the upper case and the cylindrical outer surface of the annular base part of the lower case allowing smooth sliding of the relative rotation Entry of foreign matter such as dust from is as much as possible prevented by seal by the labyrinth effect, it can also be avoided a problem of abnormal wear of the radial slide bearing portions due to of the foreign matter intrusion.

  In the thrust sliding bearing of the present invention, the synthetic resin forming the thrust sliding bearing piece disposed between the upper case and the lower case is preferably self-lubricating, and the synthetic resin forming the upper case and the lower case is In addition, it is preferable to have excellent sliding strength such as wear resistance, impact resistance, creep resistance and mechanical strength such as rigidity. Specifically, the upper case and the lower case are made of polyacetal resin, polyamide resin, It is preferably formed from a thermoplastic synthetic resin such as a polyester resin, and the thrust slide bearing piece is preferably formed from a polyethylene resin, a fluorine resin, or the like.

  A mounting structure for mounting a strut type suspension of a vehicle equipped with a hydraulic shock absorber and a coil spring disposed surrounding the hydraulic shock absorber to the vehicle body via the thrust sliding bearing is a piston rod of a hydraulic shock absorber. And an upper spring receiving means for receiving a coil spring.The thrust slide bearing is disposed between the mounting means and the upper spring receiving means. A vehicle body mounting member having an annular flat plate-like portion fixed to the vehicle body side, a cylindrical projecting portion projecting downward from an annular inner edge of the annular flat plate-like portion and defining a through-hole on the inner peripheral surface; An annular flat plate portion integrally formed on the lower surface of the circular flat plate portion, and a mounting member having a cylindrical hanging portion extending downward from the annular outer edge of the circular flat plate portion. The upper spring receiving means includes an annular flat plate-like portion, an upper spring receiving member provided with a cylindrical protruding portion that protrudes upward from the annular inner edge of the annular flat plate-like portion and defines a through hole on the inner peripheral surface. The lower end surface of the cylindrical projecting portion of the vehicle body mounting member and the upper end surface of the cylindrical projecting portion of the upper spring receiving member are arranged to oppose each other, and the thrust slide bearing is a cylindrical projecting portion of the vehicle body mounting member. The annular plate portion of the upper case in the annular space formed by the annular flat plate portion of the attachment member, the cylindrical hanging portion of the attachment member, the annular flat plate portion of the upper spring receiving member, and the cylindrical protrusion of the upper spring receiving member. The inner cylindrical hanging portion of the mounting member is in contact with the outer surface of the cylindrical protruding portion of the vehicle body mounting member, the annular upper surface of the annular substrate portion of the upper case is in contact with the annular flat plate portion of the mounting member, and the cylindrical hanging portion of the mounting member The outer peripheral surface of the outer cylindrical hanging part is surrounded by the inner surface. The annular lower surface of the annular base portion of the lower case is in contact with the upper surface of the flat plate portion of the upper spring receiving member, and the cylindrical small-diameter inner surface of the annular base portion of the lower case is the cylindrical protrusion of the upper spring receiving member. It is enclosed and arranged on the inner surface.

  According to the mounting structure of the present invention, when the strut assembly is rotated by the steering operation, the lower case is rotated with respect to the upper case, and the rotation of the lower case is caused by the thrust slip disposed between the upper case and the lower case. Smoothly allowed by the bearing piece, the steering operation is performed smoothly. When a radial load is applied, a bearing clearance (clearance) is maintained between the cylindrical inner surface of the outer cylindrical hanging portion of the annular substrate portion of the upper case and the cylindrical outer surface of the annular base portion of the lower case. It is smoothly allowed by the sliding of the synthetic resin in the radial sliding bearing portion formed by the formed cylindrical inner surface and cylindrical outer surface.

  According to the present invention, the radial sliding bearing portion can be formed between the upper and lower cases without using the radial sliding bearing, and the radial dimension can be reduced, and an inexpensive thrust sliding bearing and the thrust sliding bearing are used. A strut-type suspension mounting structure can be provided.

FIG. 1 is a cross-sectional view of a thrust slide bearing as an example of an embodiment of the present invention. FIG. 2 is a cross-sectional view of the lower case shown in FIG. FIG. 3 is a partially enlarged sectional view of the lower case shown in FIG. 4 is a cross-sectional view of the upper case shown in FIG. FIG. 5 is a partially enlarged cross-sectional view of the upper case shown in FIG. 6 is a plan view of the thrust slide bearing piece shown in FIG. FIG. 7 is a sectional view taken along line VII-VII of the thrust slide bearing piece shown in FIG. FIG. 8 is a cross-sectional view of a preferred example of a strut-type suspension mounting structure of the embodiment of the present invention using the thrust slide bearing piece shown in FIG.

  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.

  A thrust slide bearing 1 of the present invention is made of a synthetic resin lower case 2, a synthetic resin upper case 3 superimposed on the lower case 2, and a synthetic resin made between the upper case 3 and the lower case 2. And a thrust sliding bearing piece 4.

  The lower case 2 has an annular upper surface 5, an annular lower surface 6, a cylindrical small-diameter inner surface 7, a cylindrical large-diameter inner surface 8, and a cylindrical outer surface 9 disposed between the annular upper surface 5 and the annular lower surface 6. An annular base portion 11 having a wide annular recess 10, a small-diameter hole 12 defined by the cylindrical small-diameter inner surface 7 of the annular base portion 11 and opened at the annular lower surface 6 of the annular base portion 11, A large diameter in the shape of a truncated cone defined by a cylindrical conical large-diameter inner surface 8 that expands in diameter toward the annular upper surface 5 of the annular base portion 11 and opens at the annular upper surface 5 of the annular base portion 11. A hole 13, an annular inner peripheral end connected to the cylindrical small-diameter inner surface 7, an annular outer peripheral end connected to the cylindrical large-diameter inner surface 8, and a diameter from the lower end of the cylindrical outer surface 9. An annular projection 15 projecting outward in the direction, and the annular projection 15 A cylindrical projection 19 which is provided on the cylindrical upper surface 16 and cooperates with the cylindrical outer surface 9 and the annular upper surface 16 of the annular projection 15 on the cylindrical inner surface 17 to define the annular recess 18; In order to make the wall thickness of the annular engaging projection 20 projecting radially outward from the cylindrical outer surface and the annular base part 11 uniform, the annular lower part 6 of the annular base part 11 is annularly connected to the annular lower face 6. It is provided with two annular recesses 21 for extending the upper surface 5 and surrounding the small-diameter hole 12 for stealing meat.

  The upper case 3 is provided integrally with the annular substrate portion 25 and the cylindrical inner surface of the annular substrate portion 25 so as to hang downward from the annular upper surface 26 of the annular substrate portion 25, and the cylindrical inner surface 27. And an inner cylindrical hanging portion 29 that defines a central hole 28 concentric with the small-diameter hole 12 and an inner cylindrical shape that hangs down from the annular upper surface 26 of the annular substrate portion 25 onto the cylindrical outer surface of the annular substrate portion 25. A thick outer cylindrical drooping portion 32 having a cylindrical inner surface 31 and extending integrally below the annular lower end surface 30 of the drooping portion 29, and an annular lower surface 33 of the annular substrate portion 25. An annular recess 36 defined by a cylindrical outer surface 34 composed of a truncated conical surface of the inner cylindrical hanging portion 29 and a cylindrical inner surface 31 of the outer cylindrical hanging portion 32, and an annular lower end surface 37 of the outer cylindrical hanging portion 32. An inner cylindrical standing wall 38 standing downward from An outer cylindrical standing wall portion 39, an annular lower end surface 37 of the outer cylindrical hanging portion 32, a cylindrical outer surface 40 of the inner cylindrical standing wall portion 38, and an annular recess 42 defined by the cylindrical inner surface 41 of the outer cylindrical standing wall portion 39. And an annular engagement portion 43 projecting downward from the annular lower end surface of the outer cylindrical standing wall portion 39, and an annular hook portion 44 projecting radially inward from the tubular inner surface of the annular engagement portion 43. ing.

  The outer cylindrical hanging portion 32 having a cylindrical inner surface 31 that forms a radial sliding bearing portion with the cylindrical outer surface 9 of the lower case 2 has a wall thickness of the inner cylindrical hanging portion 29 in order to increase the strength against the radial load. It is formed larger than the wall thickness.

  The thrust slide bearing piece 4 is formed on each of an annular plate-like portion 53 having a cylindrical inner surface 52 that defines a central hole 51, and an annular upper surface 54 and an annular lower surface 55 of the annular plate-like portion 53. An annular groove 56 for containing a lubricant such as grease surrounding the central hole 51 and an annular upper surface 54 and an annular lower surface 55 of the annular plate-like portion 53 are formed, and one end thereof is formed. A plurality of radial concave grooves 58 for containing a lubricant such as grease are provided in the annular concave groove 56 and the other end is opened to the outside by a cylindrical outer surface 57 of the annular plate-like portion 53. .

  The cylindrical inner surface 52 that defines the central hole 51 of the thrust slide bearing piece 4 has an inner diameter that is larger than the outer diameter of the annular inner vertical wall surface 61 of the annular base portion 11 that defines the annular recess 10. The cylindrical outer surface 57 of the slide bearing piece 4 has an outer diameter dimension smaller than the inner diameter dimension of the annular outer standing wall surface 62 of the annular base portion 11 that defines the annular recess 10, and the annular plate-like portion 53 has an annular shape. An annular groove 56 and a radial groove 58 formed in the upper surface 54 and the annular lower surface 55 are filled with a lubricant such as grease.

  The thrust slide bearing piece 4 is disposed in the annular recess 36 with its annular upper surface 54 slidably contacting the annular lower surface 33 of the annular substrate portion 25 defining the annular recess 36, while the annular lower surface 55 is The annular inner wall surface 61 and the outer annular wall surface 62 cooperate with the annular recess bottom surface 63 of the annular base portion 11 defining the annular recess 10 to be slidably contacted with the annular recess 10, The annular lower surface 33 of the annular substrate portion 25 of the case 3 and the annular upper surface 5 of the annular base portion 11 of the lower case 2 are separated from each other, and thus the annular upper surface 54 of the annular plate-like portion 53 is wide. It is located above the opening surface of the annular recess 10.

  In the thrust sliding bearing 1 having the above-described configuration, the upper case 3 has a cylindrical large-diameter inner surface of the annular base portion 11 of the lower case 2 with a gap between the cylindrical outer surface 34 of the inner cylindrical hanging portion 29 of the annular substrate portion 25. 8 and the annular lower end surface 30 of the inner cylindrical drooping portion 29 is opposed to the annular shoulder surface 14 of the annular base portion 11 of the lower case 2 with a gap so that it is thicker than the inner cylindrical drooping portion 29 in the radial direction. The cylindrical inner surface 31 of the outer cylindrical hanging portion 32 is slidably brought into contact with the cylindrical outer surface 9 of the annular base portion 11 of the lower case 2, the inner cylindrical standing wall portion 38 is disposed in the annular recess 18, and the annular hook portion 44 is elastically fitted to the annular engagement protrusion 20, and the cylindrical outer surface 9 of the annular base 11 is slidable on the elastic fitting and the cylindrical inner surface 31 of the outer cylindrical hanging portion 32. Arranged in the annular recess 18 between the contact portion It was a form a seal by the labyrinth action in the inner cylindrical wall part 38 and the cylindrical projection 19 and the annular engaging projecting portion 20 disposed in the annular recess 42, formed by superimposed lower case 2.

  According to the thrust slide bearing 1, the relative rotation between the upper case 3 and the lower case 2 is such that, in the thrust load direction, the annular upper surface 54 of the thrust slide bearing piece 4 disposed in the annular recesses 10 and 36 and the upper case. The cylindrical inner surface 35 and the lower portion of the outer cylindrical hanging portion 32 of the upper case 3 are allowed in the radial load direction with respect to the radial sliding direction. It is permitted by smooth sliding at the radial sliding bearing portion with the cylindrical outer surface 9 of the annular base portion 11 of the case 2.

  Further, in the thrust slide bearing 1, the annular upper surface 54 of the thrust slide bearing piece 4 and the circle of the upper case 3 permitting smooth sliding of the relative rotation between the upper case 3 and the lower case 2 in the thrust load direction. Since the thrust slide bearing portion formed of the annular lower surface 33 of the annular substrate portion 25 is positioned above the sealing portion by the labyrinth action and the annular upper surface 5 of the lower case 2, the inner peripheral surface of the thrust slide bearing 1 Intrusion of foreign matter such as dust into the thrust sliding bearing portion from the side is prevented as much as possible, and troubles such as abnormal wear of the thrust sliding bearing portion due to the entry of the foreign matter can be avoided, and the radial load direction The cylindrical inner surface 31 of the outer cylindrical drooping portion 32 of the upper case 3 and the ring of the lower case 2 permitting smooth sliding of the relative rotation between the upper case 3 and the lower case 2 Intrusion of foreign matter such as dust from the outer peripheral surface side of the thrust slide bearing 1 into the radial slide bearing portion formed of the cylindrical outer surface 9 of the base body portion 11 is prevented as much as possible by the sealing portion due to the labyrinth action. It is also possible to avoid problems such as abnormal wear of the radial sliding bearing portion.

  As shown in FIG. 8, a strut suspension 72 for a vehicle including a hydraulic shock absorber (not shown) and a coil spring 71 disposed so as to surround the hydraulic shock absorber is provided via the thrust sliding bearing 1. Is attached to the vehicle body by an attachment structure 73.

  An attachment structure 73 for attaching the strut suspension 72 to the vehicle body via the thrust slide bearing 1 includes an attachment means 75 for attaching the piston rod 74 of the hydraulic shock absorber to the vehicle body, and an upper spring receiving means 76 for receiving the coil spring 71. The thrust slide bearing 1 is disposed between the attachment means 75 and the upper spring receiving means 76.

  The attachment means 75 includes a vehicle body attachment member 78 that is fixed to the vehicle body via bolts 77, and is integrally coupled to the vehicle body attachment member 78 and the annular base plate portion 25 of the upper case 3 of the thrust slide bearing 1. A mounting member 80 that surrounds the cylindrical outer surface 79 of the annular upper surface 26 and the outer cylindrical hanging portion 32; and a connection fixing means 82 for connecting and fixing the upper end portion 81 of the piston rod 74 of the hydraulic shock absorber to the vehicle body mounting member 78; It has.

  The vehicle body mounting member 78 includes an annular flat plate portion 83 fixed to the vehicle body side, and a cylindrical projecting portion that protrudes downward integrally from the annular inner edge of the annular flat plate portion 83 and defines the through hole 84 on the inner peripheral surface. 85.

  The mounting member 80 has a through hole 86 and is formed integrally with the annular flat plate portion 87 formed on the lower surface of the annular flat plate portion 83 of the vehicle body mounting member 78, and from the annular outer peripheral edge of the annular flat plate portion 87. The mounting member 80 includes an annular flat plate portion 87 fitted into the outer peripheral surface of the cylindrical projecting portion 85 of the vehicle body mounting member 78 through the through-hole 86, and an annular flat plate shape. The portion 87 is joined to the lower surface of the annular flat plate-like portion 83 of the vehicle body attachment member 78 and is integrally coupled to the vehicle body attachment member 78.

  The upper spring receiving means 76 includes an annular flat plate portion 90 and a cylindrical protruding portion 92 that protrudes upward integrally from the annular inner edge of the annular flat plate portion 90 and defines the through hole 91 on the inner peripheral surface. The upper end surface 94 of the cylindrical protruding portion 92 of the upper spring receiving member 93 is arranged to face the lower end surface 95 of the cylindrical protruding portion 85 of the vehicle body mounting member 78.

  The connection fixing means 82 includes an outer connection member 96 that is fitted on the inner surface of the vehicle body attachment member 78 on the outer surface, an annular elastic rubber body 97 that is bonded to the outer connection member 96, and an inner surface that is bonded to the annular elastic rubber body 97. A connecting member 98 and a nut 99 screwed to the upper end 81 sandwiching the inner edge of the inner connecting member 98 together with the upper end 81 of the piston rod 74 are provided.

  The thrust slide bearing 1 includes an inner surface of the cylindrical protrusion 85 of the vehicle body mounting member 78, a lower surface of the annular flat plate portion 87 of the mounting member 80, an inner surface of the cylindrical hanging portion 89, and an upper surface of the annular flat plate portion 90 of the upper spring bearing member 93. And the cylindrical inner surface 27 of the inner cylindrical hanging portion 29 of the annular base plate portion 25 of the upper case 3 is formed in the annular space 101 formed by the outer surface of the cylindrical protrusion 92 of the upper spring receiving member 93. The annular upper surface 26 of the annular substrate portion 25 of the upper case 3 is in contact with the lower surface of the annular flat plate portion 87 of the attachment member 80 and the cylindrical hanging portion 89 of the attachment member 80 is in contact with the outer surface of the cylindrical protrusion 85. The cylindrical outer surface 79 of the outer cylindrical drooping portion 32 is surrounded by the inner surface in contact with the inner surface of the cylindrical drooping portion 89, and the annular lower surface 6 of the annular base portion 11 of the lower case 2 is the flat plate portion of the upper spring receiving member 93. In contact with the top surface of 90 In addition, the cylindrical small-diameter inner surface 7 of the annular base portion 11 of the lower case 2 is surrounded by the inner surface of the cylindrical protrusion 92 of the upper spring receiving member 93 in contact with the inner surface of the cylindrical protrusion 92, so And the upper spring receiving member 93.

  According to the attachment structure 73, when the upper spring receiving means 76 is rotated with respect to the attachment means 75 by the steering operation, the lower case 2 is rotated with respect to the upper case 3, and the rotation of the lower case 2 is The thrust sliding bearing piece 4 disposed between the lower case 2 and the lower case 2 is smoothly allowed to perform a steering operation smoothly. When a radial load is applied, a bearing gap is formed between the cylindrical inner surface 31 of the outer cylindrical hanging portion 32 of the annular substrate portion 25 of the upper case 3 and the cylindrical outer surface 9 of the annular base portion 11 of the lower case 2. It is smoothly allowed by the sliding of the synthetic resin in the radial sliding bearing portion formed while maintaining (clearance).

  Also in the mounting structure 73, the thrust slide bearing portion in the thrust slide bearing 1 disposed in the annular space 101 is located above the sealing portion by the labyrinth action and the annular upper surface 5. In addition, intrusion of foreign matters such as dust from the outer peripheral surface side to the thrust sliding bearing portion is prevented as much as possible, and it is possible to avoid problems such as abnormal wear of the thrust sliding bearing portion due to the entry of the foreign matter, The cylindrical inner surface 31 of the outer cylindrical drooping portion 32 of the upper case 3 and the annular base portion 11 of the lower case 2 permitting smooth sliding of the relative rotation between the upper case 3 and the lower case 2 in the radial load direction. Intrusion of foreign matter such as dust from the outer peripheral surface side of the thrust slide bearing 1 into the radial slide bearing portion formed of the cylindrical outer surface 9 is prevented as much as possible by the sealing portion due to the labyrinth action. , It can also be avoided a problem of abnormal wear of the radial slide bearing portions due to of the foreign matter intrusion.

1 Thrust sliding bearing 2 Lower case 3 Upper case 4 Thrust sliding bearing piece

Claims (2)

  It comprises a synthetic resin lower case, a synthetic resin upper case superimposed on the lower case, and a synthetic plastic thrust sliding bearing piece disposed between the upper and lower cases. An annular upper surface having an annular upper surface, an annular lower surface, a cylindrical small-diameter inner surface and a cylindrical large-diameter inner surface disposed between the annular upper surface and the annular lower surface, and a cylindrical outer surface; A small-diameter hole defined by the cylindrical small-diameter inner surface of the annular base portion, and a small-diameter hole opened at the annular lower surface of the annular base portion, and a cylindrical large-diameter inner surface of the annular base portion and the A large-diameter hole that opens at the annular upper surface of the annular base portion, an annular shoulder surface that is connected to the cylindrical small-diameter inner surface at the annular inner peripheral end, and an annular shoulder surface that is connected to the cylindrical large-diameter inner surface at the annular outer peripheral end; Projects radially outward from the lower end of the cylindrical outer surface And a cylindrical projection that is provided on an annular upper surface of the annular projection and defines a second annular recess in cooperation with the cylindrical outer surface and the annular upper surface of the annular projection on the cylindrical inner surface. And an annular engagement protrusion protruding radially outward from the cylindrical outer surface of the cylindrical protrusion, and the upper case has an annular substrate portion and a cylindrical inner surface of the annular substrate portion And an inner cylindrical hanging portion that is provided integrally with the annular substrate portion so as to hang downward from the annular upper surface and defines a central hole concentric with the small-diameter hole on the cylindrical inner surface, and A thick outer wall having a cylindrical inner surface that is integrally provided on the cylindrical outer surface so as to hang from the annular upper surface of the annular substrate portion and extend downward from the annular lower end surface of the inner cylindrical hanging portion. A cylindrical hanging portion, an annular lower surface of the annular substrate portion, a cylindrical outer surface of the inner cylindrical hanging portion, and an outer cylindrical hanging portion A third annular recess defined by the cylindrical inner surface of the outer cylindrical portion, an inner cylindrical standing wall portion and an outer cylindrical standing wall portion erected downward from the annular lower end surface of the outer cylindrical hanging portion, and the outer cylinder A fourth annular recess defined by an annular lower end surface of the hanging droop, a cylindrical outer surface of the inner cylindrical standing wall portion, and a cylindrical inner surface of the outer cylindrical standing wall portion, and downward from the annular lower end surface of the outer cylindrical standing wall portion A projecting annular engagement portion; and an annular hook portion projecting radially inward from a cylindrical inner surface of the annular engagement portion. The thrust slide bearing piece has a third annular recess formed on the annular upper surface. An annular bottom surface of the annular base portion defining the first annular recess is disposed in the third annular recess while slidably contacting the annular bottom surface of the annular substrate portion to be defined. Slidably in contact with the first annular recess, the annular base of the upper case The annular lower surface of the plate portion and the annular upper surface of the annular base portion of the lower case are separated from each other, and the upper case faces the annular shoulder surface with a gap between the annular lower end surface of the inner cylindrical hanging portion, and the radial direction The cylindrical inner surface of the outer cylindrical hanging portion that is thicker than the inner cylindrical hanging portion is slidably brought into contact with the cylindrical outer surface of the annular base portion of the lower case, and the inner cylindrical standing wall portion is made to be a second annular shape. The annular hook portion is elastically fitted to the annular engagement protrusion, and the cylindrical outer surface of the annular base portion is slid onto the cylindrical inner surface of the outer cylindrical hanging portion. Sealing by labyrinth action between the inner cylindrical standing wall portion arranged in the second annular recess and the cylindrical projection portion and annular engagement projection portion arranged in the fourth annular recess between the movable contact portion A thrust slide bearing formed by overlapping the lower case.   A mounting structure for mounting a strut-type suspension of a vehicle including a hydraulic shock absorber and a coil spring disposed so as to surround the hydraulic shock absorber to a vehicle body via a thrust slide bearing according to claim 1, Mounting means for attaching the piston rod of the shock absorber to the vehicle body, and upper spring receiving means for receiving the coil spring. The thrust slide bearing is disposed between the mounting means and the upper spring receiving means. The mounting means includes an annular flat plate portion fixed to the vehicle body side, a vehicle body mounting member provided with a cylindrical projecting portion that protrudes downward from an annular inner edge of the annular flat plate portion and defines a through hole on the inner peripheral surface; An annular flat plate portion integrally formed on the lower surface of the annular flat plate portion of the vehicle body mounting member, and a cylindrical hanging portion extending downward from the annular outer edge of the annular flat plate portion. The upper spring receiving means includes an annular flat plate-like portion, a cylindrical protruding portion that protrudes upward from the annular inner edge of the annular flat plate-like portion and that defines a through-hole on the inner peripheral surface. The upper spring receiving member is composed of a lower end surface of the cylindrical projecting portion of the vehicle body mounting member and an upper end surface of the cylindrical projecting portion of the upper spring receiving member. In the annular space formed by the cylindrical projection of the member, the annular flat plate portion of the mounting member, the cylindrical hanging portion of the mounting member, the annular flat plate portion of the upper spring receiving member, and the cylindrical protruding portion of the upper spring receiving member, the upper case The inner cylindrical hanging portion of the annular substrate portion is in contact with the outer surface of the cylindrical projecting portion of the vehicle body mounting member, and the annular upper surface of the annular substrate portion of the upper case is in contact with the annular flat plate portion of the mounting member. Outside cylindrical droop on the inner surface of the cylindrical droop The outer peripheral surface is surrounded, the annular lower surface of the annular base portion of the lower case is in contact with the upper surface of the flat plate portion of the upper spring receiving member, and the cylindrical small-diameter inner surface of the annular base portion of the lower case is the upper spring receiving member A mounting structure characterized by being surrounded by an inner surface of a cylindrical protrusion of

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