JP4736867B2 - Cylindrical cylindrical bearing bush, manufacturing method thereof, and hinge structure using the cylindrical cylindrical bushing - Google Patents

Description

  The present invention relates to a flanged cylindrical bearing bush, a method of manufacturing the same, and a hinge structure using the flanged cylindrical bearing bush, such as an automobile door and a trunk.

Japanese Patent Publication No. 6-25516 Japanese Patent Publication No.63-37445

  In hinge mechanisms such as automobile doors, trunks and bonnets, a synthetic resin having lubricity is applied to the mesh and surface of the metal mesh between the bearing support mechanism and the shaft that rotates relative to the bearing support mechanism. An oil-free bearing bush having a layer is used (described in Patent Document 1).

  This non-lubricated bearing bush is electrically insulated between the inner surface and the outer surface of the bearing because the lubricity coating layer is electrically insulative. When applying electrostatic coating to the so-called white body including the door by applying it to the structure at one time, the door and the other parts such as the automobile body are electrically insulated by the bearing bush. As a result, the door itself In order to apply electrostatic coating to the door at the same time as the automobile body, wiring from the high-voltage power supply must be performed on the door as well, and workability is extremely poor. There is.

  In order to solve the above-mentioned problem, a backing metal made of a steel plate, a porous metal sintered layer integrally formed on the surface of the backing metal, and pores of the porous bronze sintered layer and a synthetic resin lubricating resin coated on the surface A technique has been proposed in which a lubricating resin layer of a multi-layer bearing made of layers is cut to impart conductivity to the multi-layer bearing with the sintered metal layer and the lubricating resin layer on the same plane (Patent Document 2). reference).

  By applying this multi-layer bearing to the hinge structure, the shaft and the support mechanism that supports the bearing can be electrically and reliably connected. As a result, wiring work becomes easier in operations such as electrostatic coating, and workability is improved. However, it requires troublesome machining of cutting the lubricating resin layer, making the manufacturing process complicated and inefficient. In addition, it is difficult to control the rate at which the porous metal sintered layer is exposed, and there is a problem that the sliding characteristics vary depending on the exposure rate of the porous metal sintered layer to the sliding surface.

  The present invention has been made in view of the above points, and the object of the present invention is to provide conductivity to a multi-layer bearing without machining such as cutting, and without wiring from a high voltage power source. Not only can electrostatic coating be applied to doors, etc., but also fluctuations in sliding characteristics can be suppressed as much as possible, and there are no problems such as rattling, and a cylindrical bearing bush with a flange, its manufacturing method, and the brazing The object is to provide a hinge structure using a cylindrical bearing bush.

  The flanged cylindrical bearing bush of the present invention includes a metal back metal, a porous bronze sintered layer formed on the surface of the back metal, and a synthetic resin filled and coated on the pores and the surface of the porous bronze sintered layer. A cylindrical portion wound in a cylindrical shape with the sliding layer on the inside, and one end portion of the cylindrical portion with the end portion being radially expanded outwardly. A part of the porous bronze sintered layer having an area ratio of 0.1 to 20% with respect to the surface area of the sliding layer side of the enlarged ridge part. It is exposed on the surface of the sliding layer side of the part and is flush with the sliding layer.

  According to the flanged cylindrical bearing bush of the present invention, a part of the porous bronze sintered layer is on the surface area of the enlarged diameter flange part on the sliding layer side of the enlarged diameter flange part formed at one end of the cylindrical part. In addition to being exposed at an area ratio of 0.1 to 20% with respect to the sliding layer and being flush with the sliding layer, the flanged cylindrical bearing bush is not only provided with conductivity, but also has an increased diameter. Exhibits excellent friction and wear characteristics even when sliding against the mating material in the buttocks.

  The synthetic resin composition filled and coated on the pores and the surface of the porous bronze sintered layer may be made of an ethylene tetrafluoride resin (hereinafter referred to as “PTFE”) containing a filler.

  The filler compounded in PTFE is selected from at least one of heat-resistant resins such as barium sulfate, phosphate, polyimide resin, calcined phenol resin, polyphenylene sulfone resin and oxybenzoyl polyester resin, silicate, and solid lubricant It is good to be done.

  This synthetic resin composition exhibits low friction and wear resistance without containing lead, which has been widely used as a filler for improving the wear resistance of the sliding layer. It is also useful from the following standpoint.

The manufacturing method of the flanged cylindrical bearing bush of the present invention includes a back metal made of a metal plate material, and a bronze having an irregular shape with an apparent density of 2.5 to 4.5 g / cm ³ formed on the surface of the back metal. A porous bronze sintered layer made of powder, and a synthetic resin composition filled in the pores of the porous bronze sintered layer and coated with a thickness of 1 to 20 μm on the surface of the porous bronze sintered layer A step of preparing a multi-layer sliding plate provided with a sliding layer, a step of preparing a wound cylindrical body wound in a cylindrical shape with the sliding layer of the multi-layer sliding plate inside, and the winding cylindrical body One end portion of the press die is inserted into the circular hole so as to protrude from the circular hole, and the end surface of the other end portion of the winding cylindrical body is constrained so as to inhibit the axial movement of the cylindrical winding body. Forming a funnel-shaped enlarged diameter portion at the end of the winding cylinder projecting from the round hole of the press die And a step of pressing the funnel-shaped enlarged diameter portion to form an enlarged diameter collar at one end of the wound cylindrical body, and 0.1 to the surface area of the sliding diameter side of the enlarged diameter collar. And a step of exposing a part of the porous bronze sintered layer with an area ratio of 20% on the surface on the sliding layer side of the enlarged diameter flange and making it flush with the sliding layer.

  According to the method of manufacturing the flanged cylindrical bearing bush of the present invention, as a result of forming the enlarged diameter flange portion through the funnel-shaped enlarged diameter portion at one end portion of the wound cylindrical body formed of the multi-layer sliding plate, A part of the sliding layer of the synthetic resin composition coated with a thickness of 1 to 20 μm on the surface of the porous bronze sintered layer at the diameter ridge is cracked by the action of tensile force, and the porous bronze just below the crack The sintered layer can be exposed and the sliding layer and a part of the exposed porous bronze sintered layer can be made flush with each other by pressing, thus providing conductivity to the surface of the enlarged diameter flange portion. can do.

  The proportion of the porous bronze sintered layer partly exposed on the surface of the enlarged ridge portion on the sliding layer side is an area ratio of 0.1 to 20% with respect to the surface area of the enlarged ridge portion on the sliding layer side. If the exposure ratio is an area ratio of 0.1 to 20% with respect to the surface area on the sliding layer side of the enlarged diameter flange portion, relative rotation with the counterpart material through the flanged cylindrical bearing bush As well as smoothing, it is possible to impart certain conductivity to the flanged cylindrical bearing bush.

  In the first hinge structure of the present invention, a pair of hinge pieces each having a shaft hole are pivoted to each other via a metal connecting shaft fitted in the shaft hole, and the shaft hole of one hinge piece is The cylindrical portion of the flanged cylindrical bearing bush is disposed between the connecting shaft and one hinge piece, and the flanged cylindrical bearing bush is disposed in the shaft hole of one hinge piece at the cylindrical portion. It is fitted and fixed to one hinge piece, and is in contact with the other hinge piece on the surface on the sliding layer side of the enlarged diameter flange portion.

  According to the first hinge structure of the present invention, the flanged cylindrical bearing bush is fitted and fixed to the one hinge piece in the shaft hole of the one hinge piece at the cylindrical portion, and The surface of the sliding layer side is in contact with the other hinge piece facing the one hinge piece, and the surface of the enlarged diameter flange portion of the flanged cylindrical bearing bush is on the sliding layer side of the enlarged diameter flange portion. Since the porous bronze sintered layer portion is dispersed and exposed at an area ratio of 0.1 to 20% with respect to the surface area of the surface, the brazed cylindrical bearing bush is provided with conductivity. Electrostatic coating can be performed on a door or the like without wiring from a high voltage power supply. Moreover, since the porous bronze sintered layer partially exposed on the sliding layer side of the enlarged diameter collar portion has an area ratio of 0.1 to 20% with respect to the surface area on the sliding layer side of the enlarged diameter collar portion. The relative rotation of the pair of hinge pieces through the flanged cylindrical bearing bush is smoothly performed.

  In the second hinge structure of the present invention, a pair of hinge pieces each having a shaft hole are pivoted to each other via a metal connecting shaft fitted in the shaft hole, and the connecting shaft and the pair of hinges The flanged cylindrical bearing bush according to any one of claims 1 to 3 is disposed between the flange and the flange, and the flanged cylindrical bearing bush has one of the surfaces on the back metal side of the enlarged diameter flange portion. The cylindrical part is brought into contact with one plate surface of the hinge piece, the cylindrical part is fitted to the one hinge piece in the axial hole of the one hinge piece, and the other cylindrical part protruding from the axial hole of the one hinge piece The other end is expanded radially outwardly at the end to form another diameter-enlarged flange part, and the back plate side surface of the other diameter-enlarged flange part is the other plate of one hinge piece. The connecting shaft is fixed to the one hinge piece so that the connecting shaft is provided at the cylindrical shaft portion and one end portion of the cylindrical shaft portion. An annular flange, and the annular flange is in contact with the sliding layer side of the diameter-enlarged flange of the flanged cylindrical bearing bush, and the cylindrical shaft portion is connected to the cylindrical portion of the flanged cylindrical bearing bush. And the shaft hole of the other hinge piece that is in contact with the surface of the sliding layer side of the other enlarged diameter flange portion of the flanged cylindrical bearing bush and faces one hinge piece, respectively, The other end is caulked and fixed to the other hinge piece.

  Also in the second hinge structure of the present invention, the area ratio of 0.1 to 20% with respect to the surface area of the enlarged diameter flange portion on the sliding layer side of the enlarged diameter flange portion of the flanged cylindrical bearing bush As a result of the porous bronze sintered layer being dispersed and exposed, the flanged cylindrical bearing bush is provided with conductivity, so that it can be electrostatically applied to the door without wiring from a high voltage power source. Can be painted. Moreover, the porous bronze sintered layer part that is partially exposed on the sliding layer side of the enlarged diameter collar part has an area ratio of 0.1 to 20% with respect to the surface area on the sliding layer side of the enlarged diameter collar part. Therefore, the relative rotation of the pair of hinge pieces through the flanged cylindrical bearing bush is smoothly performed.

  According to the present invention, conductivity can be imparted without machining such as cutting, and electrostatic coating can be performed on a door or the like without wiring from a high-voltage power source. Relative rotation of the mating material such as the like can be performed smoothly, and fluctuations in the sliding characteristics can be suppressed as much as possible, and a flanged cylindrical bearing bush that does not cause problems such as looseness due to wear and its A manufacturing method and a hinge structure using the flanged cylindrical bearing bush can be provided.

  Next, the present invention and its embodiments will be described in more detail based on preferred embodiments shown in the drawings. In addition, this invention is not limited to these Examples at all.

  1 and 2, a flanged cylindrical bearing bush 1 includes a metal back metal 2 such as a steel plate, a porous bronze sintered layer 3 integrally formed on the surface of the back metal 2, and the porous bronze sintered layer. 3 and a sliding layer 5 composed of a sliding layer 4 of a synthetic resin composition filled and coated on the surface. The sliding layer 4 of the multilayered sliding plate 5 is cylindrical with the sliding layer 4 on the inside. A wound cylindrical portion 11 and a diameter-enlarged flange portion 12 that is expanded radially outward at one end portion of the cylindrical portion 11 are provided.

  A portion of the porous bronze sintered layer 3 is exposed at an area ratio of 0.1 to 20% with respect to the surface area of the enlarged diameter collar portion 12 on the sliding layer 4 side. In addition, the exposed porous bronze sintered layer 3 and the sliding layer 4 are flush with each other.

  Since part of the porous bronze sintered layer 3 is exposed at an area ratio of 0.1 to 20% in this enlarged diameter flange portion 12, conductivity is imparted to the flanged cylindrical bearing bush 1. .

  Next, based on FIG. 2 to FIG. 6, a method for manufacturing the multilayer sliding plate 5 and the flanged cylindrical bearing bush 1 formed using the multilayer sliding plate 5 will be described.

A cold rolled steel plate (SPCC) having a thickness of 0.5 to 2.0 mm is prepared as the backing metal 2 made of a steel plate. As a bronze powder composed of 9.0 to 11.0% by weight of tin (Sn) and the balance copper (Cu), it has an irregular shape with an apparent density of 2.50 g / cm ^{3 to} 4.50 g / cm ^3. Bronze powder having a particle size distribution of 10% or less of +150 μm particles, 10 to 40% of particles of −150 μm to +106 μm, 40 to 70% of particles of −106 μm to +75 μm and 20% or less of particles of −75 μm In the heating furnace adjusted to a neutral atmosphere or a reducing atmosphere, it is uniformly sprayed on the surface of the back metal 2 and sintered at a temperature of 850 to 950 ° C. for 30 to 60 minutes. A porous bronze sintered layer 3 having a porosity of 50 to 80% by volume is formed. Here, the irregular-shaped bronze powder refers to a powder having a rod shape, a triangular shape, or the like, not a spherical shape.

  The synthetic resin composition is made of PTFE containing a filler. The filler is selected from at least one of heat-resistant resins such as barium sulfate, phosphate, polyimide resin, calcined phenol resin, polyphenylene sulfone resin and oxybenzoyl polyester resin, silicate, and solid lubricant. Preferred synthetic resin compositions include: (1) heat resistant resin 1 to 5 selected from barium sulfate 5 to 40% by weight, phosphate 1 to 30% by weight, polyimide resin, calcined phenol resin, polyphenylene sulfone resin and oxybenzoyl polyester resin A synthetic resin composition comprising 10% by weight and the remaining PTFE; (2) a synthetic resin composition comprising 5 to 30% by weight of barium sulfate, 1 to 25% by weight of phosphate, 1 to 15% by weight of silicate, and the remaining PTFE. (3) A synthetic resin composition in which a solid lubricant selected from graphite and molybdenum disulfide is further blended in a proportion of 5% by weight or less in the component compositions (1) and (2) above.

  After mixing PTFE and each of the fillers described above, a synthetic resin composition with wettability is obtained by a method of adding a petroleum solvent to the resulting mixture and stirring and mixing. The mixing of PTFE and the filler is performed at a temperature below the room temperature transition point (19 ° C.) of PTFE, preferably 10 to 18 ° C. The stirring and mixing of the obtained mixture and the petroleum solvent is the same as described above. Performed at temperature. By adopting such a temperature condition, fiber formation of PTFE is prevented and a uniform mixture can be obtained.

  As the petroleum solvent, naphtha, toluene, xylene, a mixed solvent with an aliphatic solvent or a naphthenic solvent is used. The ratio of the petroleum solvent used is preferably 15 to 30 parts by weight with respect to 100 parts by weight of the mixture of PTFE powder and filler.

The above petroleum solvent is added to a synthetic resin composition having the above component composition and stirred to prepare a synthetic resin composition having wettability. The synthetic resin composition is sprayed and supplied to the surface of the porous bronze sintered layer 3 and rolled with a roller to fill the pores of the porous bronze sintered layer 3 and the surface of the porous bronze sintered layer 3. The slip layer 4 of the synthetic resin composition having a uniform thickness is formed. Next, the petroleum-based solvent is removed by holding in a drying furnace heated to a temperature of 200 to 250 ° C. for several minutes, and then the dried synthetic resin composition is 300 to 300 mm so as to have a predetermined thickness by a roller. The pressure roller treatment is performed under a pressure of 600 kgf / cm ² .

  The backing metal 2 including the porous bronze sintered layer 3 and the sliding layer 4 subjected to the pressure roller treatment was introduced into a heating furnace and heated at a temperature of 360 to 380 ° C. for several minutes to 10 several minutes for firing. After that, by taking out from the furnace and performing the roller treatment again, the back metal 2 and the porous bronze sintered layer 3 integrally formed on the surface of the back metal 2 and the pores of the porous bronze sintered layer 3 are filled, And the multilayer sliding plate 5 which consists of the sliding layer 4 of the synthetic resin composition with which the surface was coat | covered with thickness of 1-20 micrometers is produced.

  The flanged cylindrical bearing bush 1 using the multi-layer sliding material 5 is manufactured as follows.

  The multilayered sliding plate 5 is wound into a cylindrical shape with the sliding layer 4 inside, and a wound cylindrical body 20 is produced. As shown in FIG. 3, a press die 23 having a cylindrical protrusion 21 on the upper surface and a circular hole 22 in the center, a circular hole 24 fitted to the outer peripheral surface of the cylindrical protrusion 21 of the press die 23, and a flat portion 25 on the upper surface. Is prepared, and the wound cylindrical body 20 is inserted into the circular hole 24 of the press die 26. At this time, one end portion 20a of the winding cylinder 20 protrudes outside the circular hole 24 of the press die 26 and the winding cylinder 20 is prohibited from moving in the axial direction. The end face 20 c of the other end 20 b is in contact with and restrained by the cylindrical protrusion 21 of the press die 23.

  After this insertion, as shown in FIG. 4, the column portion 31 of the punch 30 having the column portion 31 and the frustoconical portion 32 continuous to the column portion 31 is inserted into the wound cylindrical body 20 and protrudes outside from the circular hole 24. One end portion 20a of the wound cylindrical body 20 is expanded radially outward by the truncated conical portion 32 of the punch 30 to form a funnel-shaped enlarged diameter portion 20d at the end portion 20a.

  Next, as shown in FIG. 5, the small cylindrical portion 41 and the small cylindrical portion 41 are continuously integrated with each other through the annular shoulder portion 42 and have a large cylindrical portion 43 having a larger diameter than the small cylindrical portion 41. 40 is further prepared, and the wound cylindrical body 20 in which a funnel-shaped enlarged diameter portion 20d is formed at one end 20a is disposed between the punch 40 and the press die 26. The funnel-shaped enlarged diameter portion 20 d formed earlier is further expanded by the annular shoulder 42 while the small cylindrical portion 41 of the punch 40 is fitted into the wound cylindrical body 20, and the small cylindrical portion 41 of the punch 40 is then expanded. Is further inserted into the cylindrical body 20, and finally, as shown in FIG. 6, the enlarged diameter flange portion 12 sandwiched between the flat surface portion 25 and the annular shoulder portion 42 is formed. A flanged cylindrical bearing bush 1 having a diameter-enlarged flange portion 12 provided integrally with one end portion of the cylindrical portion 11 is obtained.

  In the step of forming the enlarged diameter flange portion 12 through one of the end portions 20a of the wound cylindrical body 20 via the funnel-shaped enlarged diameter portion 20d, a tensile force acts on the sliding layer 4 of the enlarged diameter flange portion 12, Tensile force causes a crack in a portion of the sliding layer 4 that is the thinnest coated on the surface of the porous bronze sintered layer 3, and a portion of the porous bronze sintered layer 3 immediately below the surface is exposed to the surface. The surface of the enlarged diameter flange 12 is pressed against the annular shoulder 42 of the punch 40, so that the sliding layer 4 and a part of the exposed porous bronze sintered layer 3 are flush with each other. As a result, a part of the porous bronze sintered layer 3 is 0.1 to 20% of the surface area of the enlarged diameter collar portion 12 on the sliding layer 4 side on the sliding layer 4 side of the enlarged diameter collar portion 12. The exposed flanged cylindrical bearing bush 1 is formed.

  A portion of the porous bronze sintered layer 3 is flush with the slip layer 4 on the sliding layer 4 side of the enlarged diameter collar portion 12 to 0.1 to 20 relative to the surface area of the enlarged diameter collar portion 12 on the sliding layer 4 side. The exposed cylindrical bearing bush 1 is provided with conductivity by being exposed at an area ratio of%. In addition, the surface of the enlarged diameter flange 12 on the sliding layer 4 side serves as a thrust sliding surface, but the porous bronze sintered layer 3 exposed on the surface of the enlarged diameter flange 12 on the sliding layer 4 side. Are partly dispersed on the surface on the sliding layer 4 side of the enlarged diameter flange portion 12 and have a very small surface area relative to the surface area on the sliding layer 4 side. It is possible to smoothly slide the enlarged diameter flange 12 on the side and the mating member. Regarding the friction and wear characteristics of the enlarged diameter flange portion 12 on the sliding layer 4 side, the friction coefficient of the enlarged diameter flange portion 12 shows a very low value of 0.06 to 0.14 under dry friction conditions. The amount of wear of 12 showed a value of 16 μm or less.

  With respect to the conductivity of the flanged cylindrical bearing bush 1, the electrical resistance was measured with a measuring device 50 shown in FIG. 7. The measuring device 50 includes a conductive cylindrical body 53 having a circular hole 52 fixed on the insulating base 51, a cylindrical portion 61, and an annular flange 62 provided at one end of the cylindrical portion 61. It comprises a conductive pressing body 63 and an electrical resistance measuring instrument X electrically connected to the cylindrical body 53 and the annular flange 62 of the pressing body 63. Then, the cylindrical portion 11 of the flanged cylindrical bearing bush 1 is fitted into the circular hole 52 of the cylindrical body 53 and the surface on the back metal 2 side of the enlarged diameter flange portion 12 is brought into contact with the end surface 54 of the cylindrical body 53 to be brazed. The cylindrical bearing bush 1 is disposed on the cylindrical body 53, the cylindrical portion 61 of the pressing body 63 is inserted into the cylindrical portion 11 of the flanged cylindrical bearing bush 1, and the back surface 64 of the annular flange 62 is connected to the cylindrical bearing bush 1 of the flange. The diameter-enhanced flange portion 12 is brought into contact with the sliding layer 4 and a load is applied to the pressing body 63 so that the electrical resistance value of the flanged cylindrical bearing bush 1 is changed to the annular flange portion 62 and the cylindrical body 53 of the pressing body 63. It was measured by an electrical resistance measuring instrument X electrically connected to.

  In addition to the sliding layer 4, the electrical resistance value (Ω) of the enlarged diameter flange portion 12 where a portion of the porous bronze sintered layer 3 is exposed at an area ratio of 0.1 to 20% shows a value of 10Ω or less. It was confirmed that the attached cylindrical bearing bush 1 was provided with conductivity.

  Next, a hinge structure using the flanged cylindrical bearing bush 1 will be described. In the hinge structure of the automobile door equipped with the flanged cylindrical bearing bush 1 shown in FIGS. 8 and 9, the fixed conductive hinge piece 70 fixed to the automobile body pillar (not shown) is connected to the body pillar. A vertical plate-shaped mounting portion 72 having a plurality of mounting holes 71 through which the fixing bolts are inserted, and a pair of horizontally extending opposite ends from the upper and lower ends of the mounting portion 72 A shaft hole 74 is formed in each of the upper and lower shaft support portions 73.

  The movable conductive hinge piece 80 fixed to the front end portion of the automobile door includes a vertical portion 81 and upper and lower horizontal portions 82 that extend from the upper and lower ends of the vertical portion 81 so as to face each other in the horizontal direction. And a mounting portion 83 extending in the vertical direction at each end of the horizontal portion 82, and a shaft hole 84 is formed in each of the pair of horizontal portions 82. A mounting hole 85 through which a bolt for fixing to the automobile door is inserted is formed.

  The conductive connecting shaft 90 includes serration shaft portions 91 at both ends, an enlarged head 92 at the end of one serration shaft 91, and an outer peripheral surface at the end of the other serration shaft 91. An annular groove 93 is provided.

  The cylindrical portion 11 of the flanged cylindrical bearing bush 1 is inserted into each of the shaft holes 84 formed in the pair of horizontal portions 82 of the movable hinge piece 80 with the diameter-expanded flange portion 12 facing outside, and each diameter-expanded flange The portion 12 is sandwiched between the shaft support portion 73 of the fixed hinge piece 70 and the horizontal portion 82 of the movable hinge piece 80, and the shaft hole 74 of each shaft support portion 73 and the inside of the cylindrical portion 11 of each flanged cylindrical bearing bush 1. The connecting shaft 90 is inserted, the diameter enlarged head portion 92 of the connecting shaft 90 is brought into contact with the outer surface of one of the shaft support portions 73, and each serration shaft portion 91 is engaged with the shaft support portion 73 in the corresponding shaft hole 74. Accordingly, the connecting shaft 90 is rotatably supported by the cylindrical portion 11 of the flanged cylindrical bearing bush 1. A snap ring 94 is fitted to the end of the connecting shaft 90 in an annular groove 93 formed on the outer peripheral surface of the end of the connecting shaft 90 projecting downward from the lower surface of the shaft support 73. 90 is secured to the fixed and movable hinge pieces 70 and 80. In this way, the fixed-side and movable-side hinge pieces 70 and 80 are pivoted to each other via the connecting shaft 90.

  With the above configuration, each serration shaft portion 91 of the connection shaft 90 is press-fitted to the shaft support portion 73 in the shaft hole 74, so that the connection shaft 90 does not rotate relative to the hinge 70 on the fixed side. Since the cylindrical portion 11 of the cylindrical bearing bush 1 with a flange is press-fitted and fitted to the horizontal portion 82 in the shaft hole 84, there is a gap between the inner surface of the cylindrical portion 11 of the cylindrical bearing bush 1 with a flange and the outer peripheral surface of the connecting shaft 90. Relative rotation is allowed only between the sliding layer 4 side of the enlarged diameter flange portion 12 of the cylindrical bearing bush 1 and the shaft support portion 73 of the hinge piece 70 on the fixed side. 11 and the sliding layer 4 of the enlarged diameter flange portion 12 are smoothly performed.

  In the hinge structure, a part of the porous bronze sintered layer 3 has a surface area on the sliding layer 4 side of the enlarged diameter flange portion 12 on the sliding layer 4 side of the enlarged diameter flange portion 12 of the flanged cylindrical bearing bush 1. In contrast, since the expanded diameter flange portion 12 is exposed at an area ratio of 0.1 to 20%, and the conductivity is given to the expanded diameter flange portion 12, the expanded diameter flange portion 12 and the fixed-side hinge regardless of the presence of the sliding layer 4 The shaft support portion 73 of the piece 70 is electrically connected to each other at a contact portion between a part of the porous bronze sintered layer 3 and the shaft support portion 73 of the hinge piece 70 on the fixed side. It is possible to perform electrostatic coating on a door or the like without wiring from the door.

  In the trunk hinge structure shown in FIG. 10 and FIG. 11 as another example of the hinge structure to which the cylindrical bearing bush 1 with the flange is attached, the conductive hinge piece 100 on the fixed side fixed to the vehicle body pillar of the automobile is horizontal. Part 101 and a mounting part 102 provided integrally at the end of the horizontal part 101, and the horizontal part 101 is inserted with a plurality of bolts 103 for fixing to a vehicle body pillar. A hole 104 is formed, and a shaft hole 105 is formed in the attachment portion 102.

  The movable conductive hinge piece 200 fixed to the trunk side of the automobile includes a horizontal portion 201 and a mounting portion 202 provided integrally with an end portion of the horizontal portion 201. Are formed with a plurality of bolt insertion holes 203 for fixing to the trunk of the automobile, and a shaft hole 204 is formed in the mounting portion 202.

  In the flanged cylindrical bearing bush 1, the back metal 2 of the enlarged diameter flange portion 12 is brought into contact with one plate surface 106 of the mounting portion 102 of the fixed hinge piece 100, and the cylindrical portion 11 is hinged 100 in the shaft hole 105. The other end portion 20b of the cylindrical portion 11 that protrudes from the shaft hole 105 after the fitting, and is expanded to the outside in the radial direction. Is fixed to the mounting portion 102 by contacting the other plate surface 107 of the mounting portion 102 of the hinge piece 100.

  The conductive connecting shaft 300 includes a cylindrical shaft portion 301 and an annular flange 302 integrally provided at one end of the cylindrical shaft portion 301, and the connecting shaft 300 includes the cylindrical shaft portion 301. The cylindrical flange 11 is inserted into the cylindrical portion 11 of the flanged cylindrical bearing bush 1, the annular flange 302 is brought into contact with the enlarged diameter flange 12 on the sliding layer 4 side of the flanged cylindrical bearing bush 1, and the columnar shaft portion 301. Is inserted into the shaft hole 204 of the mounting portion 202 of the movable hinge piece 200 disposed in contact with the sliding layer 4 of the other enlarged diameter flange portion 11a of the flanged cylindrical bearing bush 1. The end portion 303 of the cylindrical shaft portion 301 is fixed by caulking to the mounting portion 202 of the movable hinge piece 200.

  With the above configuration, the connecting shaft 300 does not rotate relative to the mounting portion 202 of the movable hinge piece 200, and the flanged cylindrical bearing bush 1 has a shaft hole 105 in the mounting portion 102 of the fixed hinge piece 100. Are connected to the sliding layer 4 of the enlarged diameter flange portion 12 of the flanged cylindrical bearing bush 1 between the inner surface of the cylindrical portion 11 of the flanged cylindrical bearing bush 1 and the outer peripheral surface of the connecting shaft 300. Relative rotation between the annular flange 302 of the shaft 300 and between the mounting portion 202 of the hinge piece 200 on the movable side and the sliding layer 4 of the enlarged diameter flange 11a of the flanged cylindrical bearing bush 1 is allowed. The relative rotation is smoothly performed by the sliding portion 4 of the cylindrical portion 11, the enlarged diameter flange portion 12, and the enlarged diameter flange portion 11a.

  In the hinge structure, a part of the porous bronze sintered layer 3 is on the side of the sliding layer 4 side of the enlarged diameter flange portion 12 on the sliding layer 4 side of the enlarged diameter flange portion 12 of the flanged cylindrical bearing bush 1. Since the conductive layer is exposed at an area ratio of 0.1 to 20% and the conductivity is imparted to the enlarged diameter flange portion 12, the annular flange between the enlarged diameter flange portion 12 and the connecting shaft 300 is provided regardless of the presence of the sliding layer 4. The portion 302 is electrically connected to each other at a contact portion between the part of the porous bronze sintered layer 3 of the enlarged diameter flange portion 12 and the annular flange portion 302 of the connecting shaft 300. It is possible to perform electrostatic coating on a door or the like without wiring from the door.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to a following example, unless the summary is exceeded.

Examples 1-3
A cold rolled steel plate (SPCC) having a thickness of 1.0 mm is prepared as a backing metal made of a steel plate, and an irregular density having an apparent density of 3.50 g / cm ³ as a bronze powder consisting of 9.0% by weight of tin and the remaining copper. A bronze powder having a shape and a particle size distribution of 10% of +150 μm particles, 30% of −150 μm to +106 μm particles, 40% of −106 μm to +75 μm particles and 20% of −75 μm particles In a heating furnace adjusted to a neutral atmosphere or a reducing atmosphere, it is sintered at a temperature of 900 ° C. for 60 minutes, and a porous material having a thickness of 0.25 mm is formed on the surface of the back metal. A bronze sintered layer was formed. The porosity of the sintered porous bronze layer was 60% by volume.

  PTFE, the main component, is blended with 100 parts by weight of a mixture of 30% by weight of barium sulfate, 10% by weight of phosphate and 10% by weight of polyimide resin, with 20 parts by weight of a petroleum solvent, and below the room temperature transition point of PTFE. Were mixed at a temperature of 15 ° C. to obtain a synthetic resin composition having wettability.

  This synthetic resin composition was sprayed and supplied onto the surface of the porous bronze sintered layer, and rolled with a roller to obtain a multilayer plate filled and packed in the pores and surface of the porous bronze sintered layer. The obtained multilayer board was kept in a hot air drying furnace heated to a temperature of 200 ° C. for 5 minutes to remove the solvent, and then the dried multilayer board was rolled with a pressure applied by a roller. Next, the pressure-treated multilayer board was heated and fired at a temperature of 370 ° C. for 10 minutes in a heating furnace, and then again pressure-treated with a roller, and the porous bronze formed integrally on the surface of the back metal and the back metal made of steel plate The sintered layer and the porous bronze sintered layer are composed of a porous layer and a sliding layer of the synthetic resin composition filled and coated on the surface. The thickness of the sliding layer is 3 μm (Example 1) and 7 μm (Example 2). ) And 15 μm (Example 3) were obtained.

  Each of the multi-layer sliding plates is cut into predetermined dimensions, and then wound into a cylindrical shape with the sliding layer of the multi-layer sliding plate inside, to produce a wound cylindrical body having an inner diameter of 8 mm, an outer diameter of 10 mm, and a length of 10 mm. did. One end of the wound cylindrical body is subjected to a flange processing by the same method as described above, and a cylindrical bearing bush with a flange having an inner diameter of 8 mm, an outer diameter of 10 mm, an enlarged diameter flange of 15 mm, and a length of 6.5 mm is provided. Produced. In the process of this heel part processing, a crack is generated in a part of the sliding layer of the enlarged diameter ridge part, and the porous bronze sintered layer immediately below the crack is exposed on the surface, and the surface of the enlarged diameter ridge part is an annular shoulder of the punch. It was confirmed that the sliding layer and a part of the exposed porous bronze sintered layer were flush with each other when pressed by the portion. The exposure ratios of the porous bronze sintered layers in the surface area of the sliding layer side of the diameter-enlarged flange portion of these flanged cylindrical bearing bushes are 5% (Example 1) and 3% (Example 2), respectively. 0.3% (Example 3).

  About these flanged cylindrical bearing bushes, the electrical resistance value was measured using the measuring device, and the presence or absence of conductivity was tested. The measurement results are shown in Table 1.

  From the above test results, it was confirmed that the electrical resistance value was small and conductivity was imparted to any of the flanged cylindrical bearing bushes.

  Next, for the flanged cylindrical bearing bushes of Examples 1 to 3 in which the above conductivity was confirmed, the sliding layer side of the enlarged diameter flange portion was brought into contact with the mating material, and the expanded diameter flange portion was tested under the test conditions shown in Table 2. The friction and wear properties of the sliding layer were tested.

(Table 2)
<Test conditions>
Surface pressure 29.4 N / mm ² (300 kgf / cm ² )
Speed 0.05m / sec (3m / min)
Test time 20 hours Mating material Carbon steel for machine structure Lubrication No lubrication

  Table 3 shows the test results of the friction and wear characteristics under the above test conditions.

上表中、摩耗量は、試験後のすべり層の寸法変化量を示した。

In the above table, the amount of wear indicates the dimensional change of the sliding layer after the test.

  From the above test results, the flanged cylindrical bearing bushes of Examples 1 to 3 in which a part of the porous bronze sintered layer was dispersed and exposed on the surface of the enlarged ridge portion in addition to the sliding layer were measured under dry lubrication conditions ( Even under no lubrication), the friction coefficient showed a low value of 0.12 or less, and the wear amount showed a low value of 12 μm.

  As described above, in the enlarged diameter flange portion of the flanged cylindrical bearing bush, in addition to the slide layer, a part of the sintered porous bronze layer is 0.1 to the surface area of the enlarged diameter flange portion on the slide layer side. Since it is exposed at an area ratio of 20%, it is possible to impart conductivity to the brazed cylindrical bearing bush without subjecting the sliding layer to machining such as cutting, and as a result, the brazed cylinder provided with conductivity. In a hinge structure using a bearing bush, it is possible not only to perform electrostatic coating on a door without wiring from a high voltage power supply, but also to smoothly perform relative rotation of a pair of hinge pieces. .

It is a perspective view which shows the cylindrical bearing bush with a flange of this invention. It is sectional drawing which shows a multilayer sliding board. It is explanatory drawing of the preferable manufacturing method of a cylindrical bearing bush with a flange. It is explanatory drawing of the preferable manufacturing method of a cylindrical bearing bush with a flange. It is explanatory drawing of the preferable manufacturing method of a cylindrical bearing bush with a flange. It is explanatory drawing of the preferable manufacturing method of a cylindrical bearing bush with a flange. It is explanatory drawing which shows the measuring apparatus of electrical resistance. It is a perspective view which shows the hinge structure of a motor vehicle door. It is a longitudinal cross-sectional explanatory drawing of the hinge structure of the motor vehicle door shown in FIG. It is a top view which shows the other hinge structure of a motor vehicle. It is a longitudinal cross-sectional explanatory drawing of the other hinge structure shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical bearing bush with flange 2 Back metal 3 Sintered porous bronze layer 4 Sliding layer 5 Multi-layer sliding plate 11 Cylindrical portion 12 Expanded flange portion 20 Rolled cylindrical body 23, 26 Press die 30, 40 Punch 70, 80, 100, 200 Hinge piece

Claims (8)

A metal back metal, a porous bronze sintered layer formed on the surface of the back metal, a pore of the porous bronze sintered layer and a sliding layer of a synthetic resin composition filled and coated on the surface, A cylindrical portion wound in a cylindrical shape with the slip layer inside, and an enlarged diameter flange portion formed by expanding the end portion radially outward at one end portion of the cylindrical portion. A part of the porous bronze sintered layer is the surface of the enlarged diameter ridge part on the sliding layer side with an area ratio of 0.1 to 20% with respect to the surface area of the enlarged diameter ridge part on the sliding layer side. flanged cylindrical bearing bush, characterized in that has a said sliding layer is flush with exposed in cracking of the sliding layer.   The flanged cylindrical bearing bush according to claim 1, wherein the synthetic resin composition is made of an ethylene tetrafluoride resin containing a filler.   The flanged cylindrical bearing bush according to claim 2, wherein the filler is selected from at least one of barium sulfate, phosphate, heat-resistant resin, silicate, and solid lubricant. A backing metal made of a metal plate, a porous bronze sintered layer made of bronze powder having an irregular shape with an apparent density of 2.5 to 4.5 g / cm ³ formed on the surface of the backing metal, and the porous Preparation of a multilayer sliding plate comprising a synthetic resin composition sliding layer filled in the pores of a sintered bronze sintered layer and coated on the surface of the sintered porous bronze layer with a thickness of 1 to 20 μm And a process of
A step of preparing a wound cylindrical body wound in a cylindrical shape with the sliding layer of the multilayer sliding plate inside,
The winding cylinder is fitted into the circular hole of the press die with one end projecting from the circular hole, and the other end of the winding cylinder is prohibited so as not to move in the axial direction. The step of restraining the end face of
Forming a funnel-shaped enlarged diameter portion at the end of the wound cylindrical body protruding from the circular hole of the press die;
A funnel-shaped enlarged diameter portion is pressed to form an enlarged diameter flange at one end of the wound cylindrical body so as to cause a crack in the sliding layer at the enlarged diameter flange , A part of the sintered porous bronze layer is exposed at the surface of the sliding layer side of the enlarged diameter flange portion at a crack of the sliding layer with an area ratio of 0.1 to 20% with respect to the surface area on the sliding layer side. And a step of making it flush with the sliding layer,
The manufacturing method of the cylindrical bearing bush with a brazing containing.   The method for manufacturing a flanged cylindrical bearing bush according to claim 4, wherein the synthetic resin composition is made of an ethylene tetrafluoride resin containing a filler.   The method for producing a flanged cylindrical bearing bush according to claim 5, wherein the filler is selected from at least one of barium sulfate, phosphate, heat-resistant resin, silicate, and solid lubricant.   A pair of hinge pieces each having a shaft hole are pivotally attached to each other via a metal connecting shaft fitted into the shaft hole, and the connecting shaft and one hinge piece are connected to each other in the shaft hole of one hinge piece. The cylindrical portion of the flanged cylindrical bearing bush according to any one of claims 1 to 3 is arranged between the cylindrical portions, and the cylindrical portion of the flanged cylindrical bearing bush is formed in the shaft hole of one hinge piece at the cylindrical portion. A hinge structure characterized by being fitted and fixed to the one hinge piece and in contact with the other hinge piece on the surface of the sliding flange side of the enlarged diameter flange portion.   A pair of hinge pieces each having a shaft hole are pivotally attached to each other via a metal connecting shaft fitted in the shaft hole, and between the connecting shaft and the pair of hinge pieces. The cylindrical bearing bush with a flange according to any one of the above is arranged, and the cylindrical bearing bush with a flange abuts the surface on the back metal side of the enlarged diameter flange portion on one plate surface of one hinge piece. The cylindrical portion is fitted into the one hinge piece in the shaft hole of one hinge piece, and the other end portion of the cylindrical portion protruding from the shaft hole of the one hinge piece has a diameter. The other diameter-expanded flange portion is formed by expanding the diameter outward in the direction, and the surface of the back metal side of the other diameter-expanded flange portion is brought into contact with the other plate surface of one hinge piece. It is fixed to the hinge piece, and the connecting shaft includes a cylindrical shaft portion and an annular flange provided at one end of the cylindrical shaft portion, The cylindrical flange of the flanged cylindrical bearing bush is in contact with the sliding layer side of the diameter-enlarged flange of the flanged cylindrical bearing bush. The shaft hole of the other hinge piece that is in contact with the surface on the sliding layer side of the other enlarged diameter flange portion of the cylindrical bearing bush is passed through, and the other end of the cylindrical shaft portion is connected to the other hinge piece. A hinge structure characterized by being fixed with caulking.

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