JP2013170598A - V-belt type automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weight roller which has low sliding frictional resistance, small variation of a frictional resistance, and excellent wear resistance, and to provide a guide member, and a V-belt type automatic transmission including the same.SOLUTION: A V-belt type automatic transmission 1 includes: a weight roller 50 having a surface layer part 53 formed of a lubricating resin composition on the outer periphery of a metal roller body 51, the composition including 20 to 40 mass% of polyarylate resin, 10 to 30 mass% of tetrafluoroethylene resin, 2 to 8 mass% of an impact modifier, 0.5 to 3 mass% of graphite, and the balance of an aliphatic polyamide resin; and a guide member 56 formed of the lubricating resin composition. The weight roller 50 is smoothly moved in a radial direction of a rotary shaft 2 with low sliding frictional resistance. A movable pulley plate 13 is supported by the guide member 56 disposed in a recessed part formed in the outer peripheral edge of a ramp plate 40, and is guided smoothly with low sliding frictional resistance toward a pressure moving direction.

Description

  The present invention relates to a V-belt type automatic transmission used in a vehicle such as a motorcycle or a snow vehicle.

  For vehicles such as motorcycles and snowmobiles, the groove width of the variable groove pulley is changed in accordance with the change in the engine speed, and the meshing radius of the V-belt stretched over the variable groove pulley is continuously changed. Thus, V-belt type automatic transmissions that enable stepless speed change are widely used.

  In a V-belt type automatic transmission, a variable groove pulley is constituted by a fixed pulley plate fixed to a rotating shaft and a movable pulley plate arranged to be reciprocally movable in the axial direction of the rotating shaft. A lamp plate fixed to the rotating shaft is provided on the back side of the lens, and a cylindrical weight roller is disposed between the lamp plate and the movable pulley plate so as to be reciprocally movable in the radial direction of the rotating shaft. As the weight roller moves inward or outward in the radial direction of the rotation shaft, the axial distance between the ramp plate and the movable pulley plate is narrowed or widened, and the movable pulley plate reciprocates toward the fixed pulley plate. Thereby, the groove width of the variable groove pulley is formed to be narrow or wide. For example, when the centrifugal force acting on the weight roller increases as the engine speed increases, the weight roller moves outward in the radial direction of the rotating shaft and presses the movable pulley plate toward the fixed pulley plate. As a result, the distance between the movable pulley plate and the fixed pulley plate, that is, the groove width of the variable groove pulley is reduced, and the motorcycle is driven at high speed.

  In the V-belt type automatic transmission, a plurality of recesses are formed on the outer peripheral edge of the lamp plate fixed to the rotating shaft, and each of the recesses is made of a resin formed in a U-shape. The guide member is fitted and fixed. A plurality of protrusions are integrally formed radially inward on the inner peripheral edge of the back surface of the movable pulley plate so as to coincide with the position of the concave portion of the lamp plate, and the protrusions are the guide members. The movable pulley plate can be smoothly moved to the fixed pulley plate side by being guided by the guide member.

  Thus, in the V-belt type automatic transmission, when the weight roller moves outward in the radial direction of the rotating shaft by the action of centrifugal force as the engine speed increases, the outer peripheral surface of the weight roller is Since it is in sliding contact with the lamp plate fixed to the rotating shaft, it is required to have a predetermined weight, excellent wear resistance, and low sliding friction resistance (low friction coefficient). Furthermore, since repeated vibrational stress from the engine acts, it is required to have excellent impact resistance. The guide member that smoothly slides and supports the movable pulley plate is also required to have excellent wear resistance and low sliding friction resistance (low friction coefficient).

  In order to satisfy the above-described requirements, for example, a weight roller in which the surface of a cylindrical metal roller body is coated with a synthetic resin material containing a reinforcing fiber having self-lubricating properties (see Patent Document 1, Patent Document 2, and Patent Document 3). Alternatively, a weight roller in which the surface of a metal roller body is coated with a reinforcing fiber-containing synthetic resin material and a guide member formed of the same reinforcing fiber-containing synthetic resin material have been proposed (see Patent Document 4).

JP 61-1557859 A JP-A-61-165058 JP-A-9-42396 Japanese Patent Laid-Open No. 61-180056

  When the movable pulley plate forming the variable groove pulley is made of aluminum die cast, which is excellent in terms of weight reduction and ease of processing, the reinforcing fiber in the synthetic resin material containing reinforcing fiber covering the surface of the weight roller is made of aluminum. The sliding surface on the back of the movable pulley plate may be damaged to promote wear, and as a result, stable shifting characteristics may not be obtained. Moreover, since the guide member is always in contact with the metal counterpart, it is easily worn. For this reason, there is a possibility that a backlash caused by an increase in the sliding gap occurs and an abnormal frictional sound is generated.

  The present invention has been made in view of the above-mentioned points. The object of the present invention is to provide a weight roller, a guide member, and the like that have low sliding friction resistance, small frictional resistance variation, and excellent wear resistance. V-belt type automatic transmission provided with the above.

  The V-belt type automatic transmission according to the present invention includes a fixed pulley plate fixed to the rotating shaft, and a movable pulley fitted to the rotating shaft so as to be able to contact with and separate from the fixed pulley plate along the axial direction of the rotating shaft. A pulley plate, a weight roller that allows the movable pulley plate to move along the axial direction of the rotary shaft by moving along the radial direction of the rotary shaft by centrifugal force during rotation, and a rotation of the weight roller fixed to the rotary shaft A lamp plate having a plurality of ramp portions for slidingly guiding the weight roller when the shaft moves in the radial direction, and having a plurality of recesses formed on the outer peripheral edge at predetermined intervals in the circumferential direction And a resin guide member mounted in the recess, and the meshing radius between the V-belt and the pulley spanned between the fixed pulley plate and the movable pulley plate is continuous. The weight roller is composed of a cylindrical metal roller main body and a resin surface layer formed on the outer peripheral surface of the roller main body, The surface layer portion and the guide member are composed of polyarylate resin 20 to 40% by mass, ethylene tetrafluoride resin 10 to 30% by mass, impact modifier 2 to 8% by mass, graphite 0.5 to 3% by mass, and remaining fat. It is formed by the lubricating resin composition which consists of a group polyamide resin.

  According to the V-belt type automatic transmission of the present invention, the weight roller moves radially outward of the rotating shaft due to an increase in centrifugal force accompanying an increase in the engine speed, and the weight roller and the lamp plate slide. The contact begins. Here, since the outer layer of the weight roller is formed with the surface layer portion made of the above-described lubricating resin composition, the weight roller is smoothly moved with a low sliding frictional resistance. The movable pulley plate is pressed and moved by the movement of the weight roller. The movable pulley plate is supported by a guide member made of the above-mentioned lubricating resin composition disposed in a recess formed on the outer peripheral edge of the lamp plate. Therefore, it is guided smoothly with a low sliding frictional resistance in the pressing movement direction.

  In the V-belt type automatic transmission of the present invention, an epoxy group-containing olefin copolymer is preferably used as the impact resistance improver contained in the lubricating resin composition. Specifically, one of ethylene-glycidyl methacrylate copolymer and ethylene-glycidyl acrylate copolymer is used.

  The epoxy group-containing olefin copolymer as the impact resistance improver imparts impact resistance to the surface layer portion and the guide member made of the lubricating resin composition. Since the occurrence of problems such as settling of the parts and guide members can be suppressed as much as possible, stable transmission characteristics can be obtained over a long period of time.

  In the V-belt type automatic transmission according to the present invention, a phosphate or an aromatic polyamide resin may be blended in the lubricating resin composition as an abrasion resistance improver.

  These phosphate or aromatic polyamide resins as wear resistance improvers increase the wear resistance of the surface layer portion and guide member made of the lubricating resin composition, and slide between the weight roller and the back of the movable pulley plate. Stable shifting over a long period of time because it does not wear easily even during frictional sliding with the surface, and it does not wear easily during frictional sliding between the movable pulley plate and the guide member. Characteristics can be obtained.

  In the V-belt type automatic transmission according to the present invention, the weight roller is formed by press-fitting a surface layer portion made of a lubricating resin composition formed in a cylindrical shape on the outer peripheral surface of a cylindrical metal roller body in advance. Alternatively, the surface layer portion made of the lubricating resin composition may be formed by integral molding on the outer peripheral surface of the cylindrical metal roller body.

  According to the present invention, polyarylate resin 20-40% by mass, tetrafluoroethylene resin 10-30% by mass, impact resistance improver 2-8% by mass, graphite 0.5- A weight roller on which a surface layer portion of the lubricating resin composition made of 3% by mass and the remaining aliphatic polyamide resin is formed, and a guide member made of the lubricating resin composition. In the radial direction, the movable pulley plate is supported by a guide member disposed in a recess formed on the outer peripheral edge of the lamp plate and has a low sliding friction in the pressing movement direction. Since it is smoothly guided by the resistance force, it is possible to provide a V-belt type automatic transmission that can obtain stable speed change characteristics over a long period of time.

FIG. 1 is an explanatory plan view including a partial cross section of a V-belt type automatic transmission 1 according to an embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional explanatory view of FIG. FIG. 3 is an explanatory side view of the movable pulley plate 13 in the direction of arrows AA in FIG. FIG. 4 is an explanatory side view of the lamp plate 40 in the direction of arrows AA in FIG. FIG. 5 is a cross-sectional explanatory view of the weight roller 50. 6 is an exploded perspective view of the ramp plate 40, the guide member 56, and the movable pulley plate 13. As shown in FIG. 7A and 7B are a front explanatory view and a side explanatory view of the guide member 56, and FIG. 7C is a cross-sectional explanatory view taken along the line BB in FIG. 7A. FIG. 7D is an explanatory bottom view of the guide member 56. FIG. 8 is a schematic explanatory diagram of the flat reciprocating test machine 65. FIG. 9 is an explanatory perspective view showing a thrust test method.

  An embodiment of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to this Embodiment, Many deformation | transformation is possible within the range of the summary.

  FIG. 1 is a plan explanatory view including a partial cross section of a V-belt type automatic transmission 1 according to an embodiment of the present invention, and FIG. 2 is a partially enlarged cross-sectional explanatory view of FIG.

  As shown in FIG. 1, a V-belt type automatic transmission 1 includes a movable pulley 3 supported on a drive rotary shaft 2 and a driven follower supported on a driven rotary shaft 4 arranged in parallel to the drive rotary shaft 2. A side pulley 5 and a V-belt 6 spanned between the movable pulley 3 and the driven pulley 5 are provided.

  The driven pulley 5 includes a fixed pulley plate 7 fixed to the driven rotating shaft 4, a movable pulley plate 8 disposed on the outer peripheral surface of the driven rotating shaft 4 so as to be movable in the axial direction of the driven rotating shaft, and the movable pulley plate 8. A spring 10 is provided between the pulley plate 8 and the cover 9 and presses and urges the movable pulley plate 8 toward the fixed pulley plate 7.

  As shown in FIG. 2, the movable pulley 3 is fixed to the fixed pulley plate 11 fixed to the shaft end 2 b of the small-diameter shaft portion 2 a of the drive rotary shaft 2 and the outer peripheral surface of the small-diameter shaft portion 2 a of the drive rotary shaft 2. A movable pulley plate 13 is provided on the outer peripheral surface of the sleeve 12 so as to be movable along the axial direction X of the drive rotary shaft 2.

  The fixed pulley plate 11 includes an annular boss portion 14 and an umbrella portion 16 that is formed integrally with an outer peripheral edge 15 at one end of the annular boss portion 14 and extends outward in the radial direction Y. . An annular plane portion 18 is formed on one end surface 17 of the annular boss portion 14, and an outer peripheral edge 19 of the annular plane portion 18 is driven and rotated on the surface side 20 of the umbrella portion 16. It is connected to the frustoconical surface portion 21 that spreads outward at a predetermined angle with respect to the radial direction Y of the shaft 2. A through hole 22 is formed at the center of the annular flat surface portion 18 of the annular boss portion 14, and the through hole 22 communicates with an annular recess 24 formed on the other end surface 23 of the annular boss portion 14. doing. A truncated conical surface portion 21 formed on the surface side 20 of the umbrella portion 16 serves as a contact surface with the V-belt 6. The fixed pulley plate 11 has an annular flat surface portion 18 of the annular boss portion 14 in contact with one end surface 12a of the sleeve 12 fixed to the outer peripheral surface of the small-diameter shaft portion 2a of the drive rotating shaft 2. It is fastened and fixed by a nut 25 that is screwed into a male screw portion of one end portion 2b of the small-diameter shaft portion 2a of the drive rotary shaft 2 that is disposed through the through hole 22 of the annular boss portion 14. For this reason, the fixed pulley plate 11 rotates integrally with the drive rotating shaft 2. The fixed pulley plate 11 is made of, for example, an aluminum material, an iron material, or a stainless steel material.

  FIG. 3 is an explanatory side view of the movable pulley plate 13 in the direction of arrows AA in FIG.

  As shown in FIG. 3, the movable pulley plate 13 includes a cylindrical boss portion 27 having a through hole 26 on the inner surface and one end portion 28 of the cylindrical boss portion 27 outward in the radial direction Y of the drive rotating shaft 2. An expanding umbrella portion 29 and a cylindrical portion 31 extending in the axial direction X of the drive rotary shaft 2 are provided on the annular end portion 30 of the umbrella portion 29. The umbrella part 29 has a truncated cone surface part 33 facing the truncated cone surface part 21 formed on the surface side 32 of the fixed pulley plate 11 on the surface side 20 of the fixed pulley plate 11, and A frustoconical surface portion 35 formed with an inclination angle smaller than the inclination angle of the head cone surface portion 33, and a plurality (eight in this embodiment) of accommodating recesses 36 formed along the circumferential direction Z. On the inner surface 37 of the cylindrical portion 31, a plurality of planar quadrangular protrusions 38 extending inward in the radial direction Y with a predetermined interval in the circumferential direction Z are provided. The movable pulley plate 13 is configured such that a cylindrical bearing 39 fitted in the through hole 26 of the cylindrical boss portion 27 is inserted into the outer peripheral surface of the sleeve 12 fixed to the outer peripheral surface of the drive rotary shaft 2 and the drive rotary shaft is inserted. 2 is arranged so as to be movable in the axial direction X. The truncated conical surface portion 33 on the surface side 32 of the umbrella portion 29 of the movable pulley plate 13 serves as a contact surface with the V belt 6. The movable pulley plate 13 is made of, for example, an aluminum material, an iron material, or a stainless steel material.

  FIG. 4 is an explanatory side view of the lamp plate 40 in the direction of arrows AA in FIG.

  As shown in FIG. 4, the ramp plate 40 disposed on the back side 34 of the movable pulley plate 13 has an annular flat surface portion 41 and an outer peripheral edge 42 of the annular flat surface portion 41 with a radius from the outer peripheral edge 42 to the outer peripheral surface 43. And an umbrella portion 44 inclined inward in the direction Y. On the inner surface 45 of the umbrella portion 44, a plurality of (eight in the present embodiment) ramp portions (inclined cam portions) 46 are formed along the circumferential direction Z. A plurality of recesses 47 are formed at predetermined intervals in the circumferential direction Z across the lamp portion 46. The lamp plate 40 is fixed to the drive rotary shaft 2 by a stopper 48 that is screwed onto the outer peripheral surface of the sleeve 12 fixed to the drive rotary shaft 2. Thereby, the lamp plate 40 rotates integrally with the drive rotating shaft 2.

  Between the housing recess 36 formed on the back side 34 of the movable pulley plate 13 and the lamp portion 46 of the inner surface 45 of the umbrella portion 44 of the lamp plate 40, as it goes outward in the radial direction Y of the drive rotating shaft 2. A plurality of roller storage chambers 49 that are gradually narrowed are formed, and a cylindrical weight roller 50 is arranged in the roller storage chamber 49 so as to be movable in the radial direction Y of the drive rotary shaft 2.

  FIG. 5 is a cross-sectional explanatory view of the weight roller 50.

  As shown in FIG. 5, the weight roller 50 includes a cylindrical metal roller main body 51, a surface layer portion 53 made of a lubricating resin composition described later formed on the outer peripheral surface 52 of the metal roller main body 51, and The annular both end portions 54 and 54 of the surface layer portion 53 cover part of the annular end surfaces 55 and 55 of the metal roller main body 51. Examples of the material of the metal roller body 51 include stainless steel, carbon steel, copper or copper alloy, aluminum or aluminum alloy, and sintered metal. Since the metal material as the roller body 51 has a large specific gravity, the weight of the weight roller 50 can be increased, and the original function of the weight roller 50 that moves by centrifugal force can be enhanced.

  6 is an exploded perspective view of the ramp plate 40, the guide member 56, and the movable pulley plate 13. As shown in FIG. 7A and 7B are a front explanatory view and a side explanatory view of the guide member 56, and FIG. 7C is a sectional view taken along the line BB in FIG. 7A. FIG. 7D is an explanatory bottom view of the guide member 56.

  Guide members 56 made of a lubricating resin composition are attached to the plurality of recesses 47 formed on the outer peripheral surface 43 of the lamp plate 40. For example, as shown in FIGS. 6 and 7 (A) to 7 (D), the guide member 56 includes a pair of plane wall portions 58 that form a guide groove 57 on the inner surface, and a pair of plane wall portions 58 that face each other. A guide base 60 having a ceiling wall portion 59 for connecting one end thereof, and both end faces 61 of the guide base 60 on the both ends opening side of the guide groove 57 are integrally formed, and the planar wall portion 58 and An inner collar 62 and an outer collar 63 projecting outward from the outer peripheral surface of the ceiling wall 59 are provided. The guide member 56 includes a pair of flat wall portions 58, a ceiling wall portion 59 that connects one end of the flat wall portions 58 to the outer peripheral surface of the guide base 60, and the flat wall portions 58. And an engaging groove 64 formed by an inner flange 62 and an outer flange 63 that are integrally formed with the ceiling wall 59 interposed therebetween.

  The guide member 56 engages the guide groove 57 with the protrusion 38 formed on the inner surface 37 of the cylindrical portion 31 of the movable pulley plate 13, and the engagement groove 64 is formed on the outer peripheral surface 43 of the lamp plate 40. The lamp plate 40 is held by being fitted into the recess 47.

  The surface layer portion 53 and the guide member 56 formed on the outer peripheral surface 52 of the metal roller body 51 of the weight roller 50 are polyarylate resin, tetrafluoroethylene resin, impact resistance improver, graphite, and the remaining aliphatic polyamide resin. It is formed with the lubricating resin composition which consists of these.

  Examples of the aliphatic polyamide resin (hereinafter abbreviated as “PA”) that constitutes the main component include polycaprolactam, polyhexamethylene adipamide, polylaurin lactam, and poly-11-aminoundecane. Caprolactam (hereinafter abbreviated as “6 nylon”) is preferred.

  The polyarylate resin (hereinafter abbreviated as “PAR”) in the component is a polycondensation resin of an aromatic dibasic acid or a derivative thereof and a dihydric phenol or a derivative thereof, particularly a mixed acid of terephthalic acid and isophthalic acid. A polycondensation resin of bisphenol A having a repeating unit represented by the following formula is preferred.

  Specifically, “U polymer (registered trademark)” manufactured by Unitika Ltd. may be mentioned. The lubricating resin composition containing PAR improves sliding characteristics due to good film-forming properties of the lubricating coating of the lubricating resin composition on the sliding surface of the mating material when sliding with the mating material. This PRA is preferably used in the form of a polymer alloy with 6 nylon. The composition ratio of PAR and 6 nylon in this polymer alloy is such that PAR is 10 to 70% by mass, 6 nylon is 90 to 30% by mass, preferably PAR is 30 to 70% by mass, and 6 nylon is It is 70-30 mass%. In this polymer alloy, PAR is dispersed as particles of about 1 μm in a 6 nylon matrix, and has high impact resistance and heat resistance, and is excellent in low temperature characteristics.

  The blending amount of PAR is 20 to 40% by mass, preferably 25 to 35% by mass. When the blending amount is less than 20% by mass, the effect as a polymer alloy is not exhibited, and when the blending amount exceeds 40% by mass, the wear resistance may be lowered.

  The tetrafluoroethylene resin (hereinafter abbreviated as “PTFE”) in the component is blended for the purpose of improving low friction. As PTFE, lubricating low molecular weight PTFE is preferable. This low molecular weight PTFE is a PTFE obtained by decomposing high molecular weight PTFE (molding powder or fine powder) by irradiation or the like or adjusting the molecular weight during polymerization of PTFE to lower the molecular weight. Specifically, “TLP-10F” manufactured by Mitsui DuPont Fluorochemical Co., Ltd., “Lublon (registered trademark) L-5” manufactured by Daikin Industries, Ltd., “Fullon (registered trademark) manufactured by Asahi Glass Co., Ltd. ) L169E "," KTL-610, KTL-620 "manufactured by Kitamura Co., Ltd., and the like. The blending amount of this PTFE is 10 to 30% by mass, preferably 10 to 27% by mass. If the blending amount is less than 10% by mass, sufficient low friction cannot be imparted. If the blending amount exceeds 30% by mass, the strength and wear resistance may be decreased.

  As the impact resistance improver in the component, an epoxy group-containing olefin copolymer is used. This epoxy group-containing olefin copolymer is obtained by polymerizing one or more unsaturated glycidyl monomers and one or more olefin monomers, and the mode of copolymerization is a random copolymer. Any of a block copolymer and a graft copolymer may be used. The unsaturated glycidyl monomer is a monomer having an unsaturated bond that can be copolymerized with olefinic monomers in one molecule and having one or more epoxy groups.

（ここでＲ₁はオレフィン系不飽和結合を有する炭化水素基を表す）で表されるような不飽和グリシジルエステル類、及び一般式

（ここで、Ｘは−ＣＨ_２−Ｏ−又は

であり、Ｒ_２はオレフィン系不飽和結合を有する炭化水素基を表す）で表されるような不飽和グリシジルエーテル類、あるいは一般式

（ここで、Ｒ_３はハロゲン原子又は炭化水素基であり、Ｒ_４はオレフィン系不飽和結合を有する炭化水素基を表す）で表されるエポキシアルケン類である。 Examples of such unsaturated glycidyl monomers include, for example, the general formula

(Wherein R ₁ represents a hydrocarbon group having an olefinic unsaturated bond), and unsaturated glycidyl esters represented by the general formula:

(Where X is —CH ₂ —O— or

R ₂ represents a hydrocarbon group having an olefinic unsaturated bond), or an unsaturated glycidyl ether represented by the general formula

Here, R ₃ is a halogen atom or a hydrocarbon group, and R ₄ is a hydrocarbon group having an olefinic unsaturated bond.

  Specific examples include glycidyl acrylate, glycidyl methacrylate, itaconic acid monoglycidyl ester, itaconic acid diglycidyl ester, butenetricarboxylic acid monoglycidyl ester, butenetricarboxylic acid diglycidyl ester, butenetricarboxylic acid triglycidyl ester, p-styrenecarboxylic acid. Glycidyl ester, allyl glycidyl ether, 2-methylallyl glycidyl ether, styrene p-glycidyl ether, p-glycidyl styrene, styrene p-glycidyl ether, p-glycidyl styrene, 3,4-epoxy-1-butene, 3, 4 Epoxy-3-methyl-1-butene, 3,4-epoxy-1-pentene, 3,4-epoxy-3-methyl-1-pentene, 5,6-epoxy-1-hexene and bi Can be exemplified Le cyclohexene monoxide, etc., but as particularly preferred, mention may be made of glycidyl acrylate, glycidyl methacrylate.

  The olefin monomer that forms an olefin copolymer by copolymerization with the unsaturated glycidyl monomer may be any monomer that can substantially introduce an epoxy group into the molecule, but preferably ethylene. , Olefins such as propylene, 1-butene, butadiene, isobutylene, methylpentene, cyclopentene, cyclopentadiene, isoprene, vinyl esters such as vinyl acetate, vinyl propinate, vinyl benzoate, acrylic acid, methacrylic acid, acrylic acid or methacrylic acid Esters of acids with saturated alcohols such as methyl-, ethyl-, propyl-, butyl-, 2-ethylhexyl-, cyclohexyl-, dodecyl-, octadecyl-, maleic acid, maleic anhydride, itaconic acid, fumaric acid, Maleic acid mono Ester and diesters, vinyl chloride, vinyl methyl ether, and the like vinyl ethers such as vinyl ethyl ether and acrylic acid amide compounds.

  Examples of the epoxy group-containing olefin copolymer include binary copolymers such as ethylene-glycidyl methacrylate copolymer and ethylene-glycidyl acrylate copolymer, ethylene-vinyl acetate-glycidyl methacrylate copolymer, ethylene- Although terpolymers such as vinyl acetate-glycidyl acrylate copolymer and ethylene-acrylic acid ester-glycidyl methacrylate copolymer are exemplified, ethylene-glycidyl methacrylate copolymer is preferable.

  Specific examples of the ethylene-glycidyl methacrylate copolymer include “Bond Fast (registered trademark) 2C” and “Bond Fast (registered trademark) E” manufactured by Sumitomo Chemical Co., Ltd.

  The compounding quantity of an epoxy group containing olefin type copolymer is 2-8 mass%, Preferably it is 2.5-6 mass%. When the blending amount of the epoxy group-containing olefin copolymer is less than 2% by mass, it is not sufficient for improving the impact resistance. When the blending amount exceeds 8% by mass, the surface layer portion 53 or the guide member 56 made of the lubricating resin composition is used. There is a possibility of lowering the sliding characteristics.

  The graphite in the component is blended for the purpose of improving wear resistance. As graphite, either natural graphite or artificial graphite can be used, but natural graphite is preferably used. And the compounding quantity of graphite is 0.5-3 mass%, Preferably it is 0.5-1 mass%. When the blending amount is less than 0.5% by mass, a sufficient effect for improving the wear resistance is not exhibited. When the blending amount exceeds 3% by mass, the strength of the surface layer portion 53 or the guide member 56 made of the lubricating resin composition is increased. There is a possibility of lowering.

  Lubricating resin composition comprising the polyarylate resin, ethylene tetrafluoride resin, impact resistance improver, graphite and aliphatic polyamide resin forming the surface layer portion 53 and the guide member 56 of the outer peripheral surface 52 of the metal roller body 50 Further, a phosphate or an aromatic polyamide resin (hereinafter abbreviated as “aramid resin”) may be added as an abrasion resistance improver.

Examples of phosphates include tertiary phosphates, secondary phosphates, pyrophosphates, phosphites, metaphosphates and mixtures of metals such as alkali metals and alkaline earth metals. . Among these, tertiary phosphate, secondary phosphate and pyrophosphate are preferable. Specifically, lithium phosphate (Li ₃ PO ₄ ), lithium hydrogen phosphate (Li ₂ HPO ₄ ), lithium pyrophosphate (Li ₄ P ₂ O ₇ ), calcium phosphate (Ca ₃ (PO ₄ ) ₂ ), phosphorus Calcium hydrogen hydrogen (CaHPO ₄ (· 2H ₂ O)), calcium pyrophosphate (Ca ₂ P ₂ O ₇ ), magnesium phosphate (Mg ₃ (PO ₄ ) ₂ · 4H ₂ O), magnesium hydrogen phosphate (MgHPO ₄ ) , Magnesium pyrophosphate (Mg ₂ P ₂ O ₇ ), barium phosphate (Ba ₃ (PO ₄ ) ₂ ), barium hydrogen phosphate (BaHPO ₄ ) and barium pyrophosphate (Ba ₂ P ₂ O ₇ ). In particular, lithium phosphate is preferable.

  This phosphate preferably has an average particle size of 20 μm or less in order to mix uniformly. Moreover, about what has crystallization water in a phosphate, it is used, after evaporating away this crystallization water by heat-processing previously. The compounding quantity of a phosphate is 1.0-5 mass%, Preferably it is 1.5-3 mass%. If the blending amount is less than 1.0% by mass, no effect is exerted on the film-forming property of the lubricating coating of the lubricating resin composition on the surface of the counterpart material, the retaining property and durability of the lubricating coating, and it exceeds 3% by mass. When blended, there is a disadvantage that a good lubricant film is not formed on the surface of the counterpart material and the friction and wear characteristics are deteriorated.

  Examples of the aramid resin include meta-type polymetaphenylene isophthalamide resin, para-type polyparaphenylene terephthalamide resin, and copolyparaphenylene 3,4'-oxydiphenylene terephthalamide resin. Specific examples of the meta-type polymetaphenylene isophthalamide resin include “Conex (registered trademark)” manufactured by Teijin Limited, and “Nomex (registered trademark)” manufactured by DuPont. Specific examples of the para-type polyparaphenylene terephthalamide resin include “Kevlar (registered trademark)” manufactured by DuPont Co., Ltd., and “Twaron (registered trademark)” manufactured by Teijin Twaron Bethroten Fennot Chap. It is done. Specific examples of the copolyparaphenylene 3,4'-oxydiphenylene terephthalamide resin include “Technola (registered trademark)” manufactured by Teijin Limited. These aramid resins are used in the form of a powder.

  The aramid resin powder preferably has an average particle diameter of 5 to 50 μm. This is because the resin composition cannot obtain sufficient wear resistance with small particles having an average particle diameter of less than 5 μm, and the sliding partner material may be damaged with large particles having a particle diameter exceeding 50 μm. The blending amount of the aramid resin powder is 3 to 10% by mass, preferably 4 to 8.5% by mass. When the blending amount is less than 3% by mass, no effect is observed in improving the wear resistance. When the blending amount exceeds 10% by mass, the moldability of the lubricating resin composition is adversely affected. There is a possibility that the strength of the molded product is reduced.

  The lubricating resin composition can be obtained by mixing predetermined amounts of each of the above components with a mixer such as a Henschel mixer, a super mixer, a ball mill, or a tumbler mixer according to a conventional method.

  The weight roller 50 in the V-belt type automatic transmission of the present invention has a metal roller body 51 disposed in a mold, and the lubricating resin composition is injection-molded on the outer peripheral surface 52 of the roller body 51 to perform the lubrication. The surface layer portion 53 made of a water-soluble resin composition is integrally formed by a so-called insert molding method, or a cylindrical molding is prepared in advance by injection molding of the lubricating resin composition. The molded product is produced by a method in which the surface layer portion 53 is formed by press-fitting the molded product onto the outer peripheral surface 52 of the metal roller body 51.

  Further, the guide member 56 in the V-belt type automatic transmission according to the present invention is formed by injection molding the lubricating resin composition.

  The lubricating resin composition can be molded by a method in which the mixture of the lubricating resin composition is directly put into an injection molding machine, or the mixture of the lubricating resin composition is put into an extrusion molding machine to form a string. Alternatively, a method may be used in which a string-shaped molded product is molded, and then the string-shaped molded product is cut to produce a pellet, and the pellet is used as a molding raw material in an injection molding machine.

  EXAMPLES Next, although this invention is demonstrated in detail based on an Example, this invention is not limited to a following example, unless the summary is exceeded. Table 1 shows PA, PAR, PTFE, graphite, phosphate, and aramid resin used in Examples and Comparative Examples.

[Example 1]
6 18% by weight of nylon (A-1), 50% by weight of PAR (B-1), 25% by weight of PTFE (C-1), 6% by weight of ethylene-glycidyl methacrylate copolymer (D-1), graphite (E -1) 1.0 mass% was put into a super mixer and mixed to produce a lubricating resin composition (mixed powder). Then, the mixed powder is put into an extruder, melt-kneaded and extruded to be 63.0% by mass of nylon, 25.0% by mass of PAR, 25.0% by mass of PTFE, ethylene-glycidyl methacrylate copolymer. After forming a string-like lubricating resin molded article composed of 0% by mass and graphite 1.0% by mass, this was cut to produce a lubricating resin pellet.

  A cylindrical roller body made of carbon steel having an outer diameter of 20 mm, an inner diameter of 18 mm, and a length of 12 mm is prepared. The cylindrical roller body is placed in a mold of an injection molding machine, and the lubricating resin pellet is placed on the outer peripheral surface of the roller body. A weight roller having a surface layer portion having a thickness of 2 mm was formed by injection molding to form a surface layer portion having a thickness of 2 mm on the outer peripheral surface of the roller body.

  On the other hand, the same lubricating resin pellets as the above-mentioned lubricating resin pellets were put into an injection molding machine and injection molded to produce a rectangular plate-shaped test piece having a side of 30 mm and a thickness of 3 mm.

[Example 2]
6 Nylon (A-1) 14.4% by mass, PAR (B-1) 60% by mass, PTFE (C-1) 20.0% by mass, ethylene-glycidyl methacrylate copolymer (D-1) 4.8 Mass% and graphite (E-1) 0.8 mass% were put into a super mixer and mixed to produce a lubricating resin composition (mixed powder). Then, the mixed powder is put into an extruder, melt-kneaded, and extruded to be 64.4% by weight of 6 nylon, 30.0% by weight of PAR, 20.0% by weight of PTFE, ethylene-glycidyl methacrylate copolymer. After forming a string-like lubricating resin molded product comprising 8% by mass and graphite 0.8% by mass, this was cut to produce a lubricating resin pellet.

  A cylindrical roller body made of carbon steel having an outer diameter of 20 mm, an inner diameter of 18 mm, and a length of 12 mm is prepared. The cylindrical roller body is placed in a mold of an injection molding machine, and the lubricating resin pellet is placed on the outer peripheral surface of the roller body. A weight roller having a surface layer portion having a thickness of 2 mm was formed by injection molding to form a surface layer portion having a thickness of 2 mm on the outer peripheral surface of the roller body.

  On the other hand, the same lubricating resin pellets as the above-mentioned lubricating resin pellets were put into an injection molding machine and injection molded to produce a rectangular plate-shaped test piece having a side of 30 mm and a thickness of 3 mm.

[Example 3]
6 Nylon (A-1) 9 mass%, PAR (B-1) 75 mass%, PTFE (C-1) 12.5 mass%, ethylene-glycidyl methacrylate copolymer (D-1) 3 mass%, graphite (E-1) 0.5% by mass was charged into a super mixer and mixed to produce a lubricating resin composition (mixed powder). The mixed powder was put into an extruder, melt-kneaded, and extruded to be 66.5% by mass of nylon, 37.5% by mass of PAR, 12.5% by mass of PTFE, and 3% by mass of ethylene-glycidyl methacrylate copolymer. %, And a string-like lubricating resin molded article made of 0.5% by mass of graphite was molded and then cut to prepare a lubricating resin pellet.

  A cylindrical roller body made of carbon steel having an outer diameter of 20 mm, an inner diameter of 18 mm, and a length of 12 mm is prepared. The cylindrical roller body is placed in a mold of an injection molding machine, and the lubricating resin pellet is placed on the outer peripheral surface of the roller body. A weight roller having a surface layer portion having a thickness of 2 mm was formed by injection molding to form a surface layer portion having a thickness of 2 mm on the outer peripheral surface of the roller body.

  On the other hand, the same lubricating resin pellets as the above-mentioned lubricating resin pellets were put into an injection molding machine and injection molded to produce a rectangular plate-shaped test piece having a side of 30 mm and a thickness of 3 mm.

[Example 4]
6 Nylon (A-1) 13.0% by mass, PAR (B-1) 50% by mass, PTFE 27.0% by mass, ethylene-glycidyl methacrylate copolymer (D-1) 6.0% by mass, graphite ( E-1) 1.0% by mass and 3.0% by mass of lithium phosphate (F-1) were charged into a super mixer and mixed to produce a lubricating resin composition (mixed powder). Then, the mixed powder is put into an extruder, melt-kneaded, and extruded to be 68.0 nylon 38.0 mass%, PAR 25.0 mass%, PTFE 27.0 mass%, ethylene-glycidyl methacrylate copolymer. A string-like lubricating resin molded article composed of 0% by mass, 1.0% by mass of graphite and 3.0% by mass of lithium phosphate was formed, and this was cut to prepare a lubricating resin pellet.

  A cylindrical roller body made of carbon steel having an outer diameter of 20 mm, an inner diameter of 18 mm, and a length of 12 mm is prepared. The cylindrical roller body is placed in a mold of an injection molding machine, and the lubricating resin pellet is placed on the outer peripheral surface of the roller body. A weight roller having a surface layer portion having a thickness of 2 mm was formed by injection molding to form a surface layer portion having a thickness of 2 mm on the outer peripheral surface of the roller body.

  On the other hand, the same lubricating resin pellets as the above-mentioned lubricating resin pellets were put into an injection molding machine and injection molded to produce a rectangular plate-shaped test piece having a side of 30 mm and a thickness of 3 mm.

[Example 5]
6 Nylon (A-1) 10.4% by mass, PAR (B-1) 60% by mass, PTFE (C-1) 21.6% by mass, ethylene-glycidyl methacrylate copolymer (D-1) 4.8 Mass%, graphite (E-1) 0.8 mass%, and lithium phosphate (F-1) 2.4 mass% were charged into a super mixer and mixed to produce a lubricating resin composition (mixed powder). . Then, the mixed powder is put into an extruder, melt-kneaded and extruded to be 60.4% by mass of 6 nylon, 30.0% by mass of PAR, 21.6% by mass of PTFE, ethylene-glycidyl methacrylate copolymer. A string-like lubricating resin molded article composed of 8% by mass, graphite 0.8% by mass, and lithium phosphate 2.4% by mass was formed, and this was cut to prepare a lubricating resin pellet.

  A cylindrical roller body made of carbon steel having an outer diameter of 20 mm, an inner diameter of 18 mm, and a length of 12 mm is prepared. The cylindrical roller body is placed in a mold of an injection molding machine, and the lubricating resin pellet is placed on the outer peripheral surface of the roller body. A weight roller having a surface layer portion having a thickness of 2 mm was formed by injection molding to form a surface layer portion having a thickness of 2 mm on the outer peripheral surface of the roller body.

  On the other hand, the same lubricating resin pellets as the above-mentioned lubricating resin pellets were put into an injection molding machine and injection molded to produce a rectangular plate-shaped test piece having a side of 30 mm and a thickness of 3 mm.

[Example 6]
6 nylon (A-1) 6.5 mass%, PAR (B-1) 75 mass%, PTFE (C-1) 13.5 mass%, ethylene-glycidyl methacrylate copolymer (D-1) 3 mass% Then, 0.5% by mass of graphite (E-1) and 1.5% by mass of lithium phosphate (F-1) were charged into a super mixer and mixed to produce a lubricating resin composition (mixed powder). Then, the mixed powder was put into an extruder and melt-kneaded, and extruded to be 64.0 nylon 44.0% by mass, PAR 37.5% by mass, PTFE 13.5% by mass, ethylene-glycidyl methacrylate copolymer 3% by mass. %, Graphite 0.5% by mass, lithium phosphate 1.5% by mass was formed into a string-like lubricating resin molded product, which was then cut to produce a lubricating resin pellet.

  A cylindrical roller body made of carbon steel having an outer diameter of 20 mm, an inner diameter of 18 mm, and a length of 12 mm as in Example 1 was prepared, and this was placed in a mold of an injection molding machine and the outer peripheral surface of the roller body The lubrication resin pellets were injection molded to produce a weight roller having a 2 mm thick surface layer formed on the outer peripheral surface of the roller body.

  On the other hand, the same lubricating resin pellet as the above-mentioned lubricating resin pellet was put into an injection molding machine and injection molded to produce a plate-shaped test piece having a side of 30 mm and a thickness of 3 mm.

[Example 7]
6 Nylon (A-1) 15.5% by mass, PAR (B-1) 50% by mass, PTFE (C-1) 20% by mass, ethylene-glycidyl methacrylate copolymer (D-1) 5.0% by mass Then, 1.0% by mass of graphite (E-1) and 8.5% by mass of aramid resin (G-1) were put into a super mixer and mixed to produce a lubricating resin composition (mixed powder). Then, the mixed powder is put into an extruder, melt-kneaded, and extruded to be 60.5 nylon 40.5% by mass, PAR 25.0% by mass, PTFE 20.0% by mass, ethylene-glycidyl methacrylate copolymer. After forming a string-like lubricating resin molding composed of 0% by mass, graphite 1.0% by mass, and aramid resin 8.5% by mass, this was cut to produce a lubricating resin pellet.

  A cylindrical roller body made of carbon steel having an outer diameter of 20 mm, an inner diameter of 18 mm, and a length of 12 mm as in Example 1 was prepared, and this was placed in a mold of an injection molding machine and the outer peripheral surface of the roller body The lubrication resin pellets were injection molded to produce a weight roller having a 2 mm thick surface layer formed on the outer peripheral surface of the roller body.

  On the other hand, the same lubricating resin pellets as the above-mentioned lubricating resin pellets were put into an injection molding machine and injection molded to produce a rectangular plate-shaped test piece having a side of 30 mm and a thickness of 3 mm.

[Example 8]
6 Nylon (A-1) 12.4 mass%, PAR (B-1) 60 mass%, PTFE (C-1) 16.0 mass%, ethylene-glycidyl methacrylate copolymer (D-1) 4.0 Mass%, graphite (E-1) 0.8 mass%, and aramid resin (G-1) 6.8 mass% were charged into a super mixer and mixed to produce a lubricating resin composition (mixed powder). Then, the mixed powder is put into an extruder, melt-kneaded and extruded to be 62.4 nylon 42.4% by mass, PAR 30.0% by mass, PTFE 16.0% by mass, ethylene-glycidyl methacrylate copolymer. After forming a string-like lubricating resin molded article composed of 0% by mass, graphite 0.8% by mass, and aramid resin 6.8% by mass, this was cut to produce a lubricating resin pellet.

  A cylindrical roller body made of carbon steel having an outer diameter of 20 mm, an inner diameter of 18 mm, and a length of 12 mm as in Example 1 was prepared, and this was placed in a mold of an injection molding machine and the outer peripheral surface of the roller body The lubrication resin pellets were injection molded to produce a weight roller having a 2 mm thick surface layer formed on the outer peripheral surface of the roller body.

  On the other hand, the same lubricating resin pellets as the above-mentioned lubricating resin pellets were put into an injection molding machine and injection molded to produce a rectangular plate-shaped test piece having a side of 30 mm and a thickness of 3 mm.

[Example 9]
6 Nylon (A-1) 9.3 mass%, PAR (B-1) 70 mass%, PTFE (C-1) 12.0 mass%, ethylene-glycidyl methacrylate copolymer (D-1) 3.0 Mass%, graphite (E-1) 0.6 mass%, and aramid resin (G-1) 5.1 mass% were put into a super mixer and mixed to produce a lubricating resin composition (mixed powder). Then, the mixed powder is put into an extruder, melt-kneaded, and extruded to be 44.3% by mass of 6 nylon, 35.0% by mass of PAR, 12.0% by mass of PTFE, and ethylene-glycidyl methacrylate copolymer. After forming a string-like lubricating resin molding composed of 0% by mass, graphite 0.6% by mass, and aramid resin 5.1% by mass, this was cut to produce a lubricating resin pellet.

  A cylindrical roller body made of carbon steel having an outer diameter of 20 mm, an inner diameter of 18 mm, and a length of 12 mm as in Example 1 was prepared, and this was placed in a mold of an injection molding machine and the outer peripheral surface of the roller body The lubrication resin pellets were injection molded to produce a weight roller having a 2 mm thick surface layer formed on the outer peripheral surface of the roller body.

  On the other hand, the same lubricating resin pellets as the above-mentioned lubricating resin pellets were put into an injection molding machine and injection molded to produce a rectangular plate-shaped test piece having a side of 30 mm and a thickness of 3 mm.

[Comparative Example 1]
46 Nylon was used as the aliphatic polyamide resin, and 75% by mass of 46 nylon, 15% by mass of carbon fibers, and 10% by mass of PTFE were charged into a super mixer and mixed to produce a resin composition (mixed powder). Then, the mixed powder was put into an extrusion molding machine, melted and kneaded, extruded to form a string-like resin molded product made of the resin composition, and then cut to produce resin pellets.

  A cylindrical roller body made of carbon steel having an outer diameter of 20 mm, an inner diameter of 18 mm, and a length of 12 mm as in Example 1 was prepared, and this was placed in a mold of an injection molding machine and the outer peripheral surface of the roller body The resin pellets were injection molded into a weight roller having a 2 mm thick surface layer formed on the outer peripheral surface of the roller body.

  On the other hand, the same resin pellet as the above resin pellet was put into an injection molding machine and injection molded to produce a square plate-shaped test piece having a side of 30 mm and a thickness of 3 mm.

[Comparative Example 2]
66 nylon was used as the aliphatic polyamide resin, and 80% by mass of 66 nylon, 10% by mass of carbon fiber, and 10% by mass of PTFE were put into a super mixer and mixed to produce a resin composition (mixed powder). Then, the mixed powder was put into an extrusion molding machine, melted and kneaded, extruded to form a string-like resin molded product made of the resin composition, and then cut to produce resin pellets.

  A cylindrical roller body made of carbon steel having an outer diameter of 20 mm, an inner diameter of 18 mm, and a length of 12 mm as in Example 1 was prepared, and this was placed in a mold of an injection molding machine and the outer peripheral surface of the roller body The resin pellets were injection molded into a weight roller having a 2 mm thick surface layer formed on the outer peripheral surface of the roller body.

  On the other hand, the same resin pellet as the above resin pellet was put into an injection molding machine and injection molded to produce a square plate-shaped test piece having a side of 30 mm and a thickness of 3 mm.

  Next, with respect to the weight rollers obtained in Examples 1 to 9 and Comparative Examples 1 to 2, the results of the frictional wear test performed by the plane reciprocating tester shown in FIG. As for the plate-like test pieces obtained in Example 9 and Comparative Examples 1 and 2, the results of the frictional wear test performed by the thrust tester shown in FIG. 9 will be described.

  Table 2 shows the test conditions of the plane reciprocation test.

<Plane reciprocation testing machine and test method>
FIG. 8 is a schematic explanatory diagram of the flat reciprocating test machine 65. As shown in FIG. 8, the flat reciprocating motion test machine 65 fixes a weight jig 50 and a mating member 67 on a fixed base 68 via a needle roller bearing (not shown). Are provided with a slide table 69 that reciprocates, a hydraulic servo actuator 71 that applies reciprocating motion to the slide table 69 via a joint 70, and a load cell 72 that detects a frictional force. In the test method, the weight roller 50 obtained in the first to ninth examples and the first to second comparative examples is attached to the fixing jig 66, and the load 67 is applied to the mating member 67 while applying the load P to the fixing jig 66. The frictional force generated on the sliding surface between the weight roller 50 and the mating member 67 when the slide table 69 to which the mating material 67 is fixed is reciprocated is measured by the load cell 72, and the frictional force is determined from the measured frictional force. This is a method for obtaining a coefficient. Further, after the planar reciprocation test is completed, the wear amount of the surface layer portion 53 of the weight roller 50 is measured.

  Table 3 shows the test conditions for the thrust test.

<Thrust test method>
FIG. 9 is an explanatory perspective view showing a thrust test method. As shown in FIG. 9, in the thrust test method, the rectangular plate-shaped test piece 73 obtained in Examples 1 to 9 and Comparative Examples 1 to 2 is fixed, and a cylindrical body serving as a counterpart material. The cylindrical body 74 is rotated in the direction of the arrow Z while a load P in the direction from the upper part of the plate-shaped test piece 73 toward the surface 75 is applied to 74, and the slide between the plate-shaped test piece 73 and the cylindrical body 74 is performed. This is a method of measuring the friction coefficient generated on the surface. Further, after the thrust test is completed, the wear amount of the plate-like test piece 73 is measured.

  The test results are shown in Tables 4-7.

  In Table 7, * indicates that the durability was 8800 times and the friction coefficient exceeded 0.4, so the test was stopped. As the amount of wear, the amount of wear at the end of 8,800 times of durability was displayed.

  From the test results, it can be seen that the weight roller and the plate-like test piece of Examples 1 to 9 are superior in friction and wear characteristics than the weight roller and the plate-like test piece of Comparative Examples 1 to 2. Recognize. In particular, the weight roller and the plate-like test piece according to the comparative example greatly vary in friction and wear characteristics depending on the material of the counterpart material.

  As described above, the V-belt type automatic transmission includes the metal roller body 51 and the polyarylate resin, the tetrafluoroethylene resin, the impact resistance improver, the graphite, formed on the outer peripheral surface 52 of the roller body 51. A weight roller 50 comprising a lubricating resin composition comprising the remaining aliphatic polyamide resin, or a surface layer portion 53 of a lubricating resin composition further containing a phosphate or aramid resin, and a guide comprising the lubricating resin composition Since the member 56 is provided, the movement of the weight roller 50 is smoothly performed with a low frictional resistance, and the movable pulley plate 13 is arranged in a recess 47 formed on the outer peripheral edge of the ramp plate 40. And is smoothly guided with a low frictional resistance in the pressing movement direction, so that stable transmission characteristics can be obtained over a long period of time.

1: V-belt type automatic transmission 2: Drive rotary shaft 3: Movable pulley 4: Driven rotary shaft 5: Driven pulley 6: V belt 7, 11: Fixed pulley plate 8, 13: Movable pulley plate 40: Ramp plate 46: ramp part 50: weight roller 51: metal roller body 53: surface layer part 56: guide member

Claims (9)

A fixed pulley plate fixed to the rotating shaft, a movable pulley plate fitted to the rotating shaft so as to be able to contact with and separate from the fixed pulley plate along the axial direction of the rotating shaft, and rotation by centrifugal force during rotation A weight roller that allows the movable pulley plate to move along the axial direction of the rotary shaft by movement along the radial direction of the shaft, and the weight roller that is fixed to the rotary shaft and moves when the weight roller rotates in the radial direction. A lamp plate provided with a plurality of lamp portions for sliding contact and having a plurality of recesses formed on the outer peripheral edge at predetermined intervals in the circumferential direction, and a resin plate mounted on the recesses A guide member, and is configured to continuously change the meshing radius of the V-belt and the pulley spanned between the fixed pulley plate and the movable pulley plate. A belt-type automatic transmission,
The weight roller includes a cylindrical metal roller main body, and a resin surface layer formed on the outer peripheral surface of the roller main body,
The surface layer portion and the guide member are composed of polyarylate resin 20 to 40% by mass, ethylene tetrafluoride resin 10 to 30% by mass, impact resistance improver 2 to 8% by mass, graphite 0.5 to 3% by mass, and remaining fat. A V-belt type automatic transmission characterized in that it is formed of a lubricating resin composition made of a group polyamide resin.   The V-belt type automatic transmission according to claim 1, wherein the impact resistance improver is made of an epoxy group-containing olefin copolymer.   The V-belt type automatic transmission according to claim 2, wherein the epoxy group-containing olefin copolymer is at least one of an ethylene-glycidyl methacrylate copolymer and an ethylene-glycidyl acrylate copolymer.   The V-belt type automatic transmission according to any one of claims 1 to 3, wherein the lubricating resin composition contains a phosphate in a proportion of 1 to 5 mass% as an abrasion resistance improver.   The V-belt type automatic transmission according to any one of claims 1 to 3, wherein the lubricating resin composition contains an aromatic polyamide resin powder in a proportion of 3 to 10% by mass as an abrasion resistance improver. .   The weight roller is formed by press-fitting the surface layer portion made of the lubricating resin composition formed in a cylindrical shape in advance on the outer peripheral surface of the cylindrical metal roller main body. The V-belt type automatic transmission according to claim 5.   6. The weight roller according to claim 1, wherein the surface layer portion made of the lubricating resin composition is integrally formed on an outer peripheral surface of the cylindrical metal roller body. 6. V belt type automatic transmission.   A weight roller used as a component of the V-belt type automatic transmission according to any one of claims 1 to 7.   A guide member used as a component of the V-belt type automatic transmission according to any one of claims 1 to 7.

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