WO2020174694A1 - Mandrel - Google Patents

Mandrel Download PDF

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Publication number
WO2020174694A1
WO2020174694A1 PCT/JP2019/010039 JP2019010039W WO2020174694A1 WO 2020174694 A1 WO2020174694 A1 WO 2020174694A1 JP 2019010039 W JP2019010039 W JP 2019010039W WO 2020174694 A1 WO2020174694 A1 WO 2020174694A1
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WO
WIPO (PCT)
Prior art keywords
mandrel
central portion
main body
central
peripheral surface
Prior art date
Application number
PCT/JP2019/010039
Other languages
French (fr)
Japanese (ja)
Inventor
一希 大田
森　健一
貴博 中山
Original Assignee
株式会社ショーワ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ショーワ filed Critical 株式会社ショーワ
Publication of WO2020174694A1 publication Critical patent/WO2020174694A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/32—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core on a rotating mould, former or core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles

Definitions

  • the present invention relates to a mandrel used for manufacturing a tubular body used for a power transmission shaft.
  • a power transmission shaft (propeller shaft) mounted on a vehicle includes a tube body extending in the front-rear direction of the vehicle, and transmits the power generated by the prime mover and decelerated by the transmission to the final reduction gear by the tube body.
  • a tubular body used for such a power transmission shaft there is a tubular body formed of fiber reinforced plastic.
  • continuous fibers impregnated with a thermosetting resin are wound around a mandrel in multiple layers to form a tubular molded body. Then, the molded body is heated to cure the resin, and a tubular body is formed. Then, the mandrel is pulled out from the opening at the end of the cured tube, and the manufacturing process ends (see Patent Document 1 below).
  • the central portion has a so-called barrel shape (barrel shape) that bulges outward in the radial direction rather than both ends.
  • barrel shape barrel shape
  • the central portion of the mandrel bulges outward and cannot pass through the opening of the tubular body, and the mandrel cannot be pulled out from the tubular body.
  • the present invention was created in order to solve such a problem, and provides a mandrel capable of manufacturing a tubular body used for a power transmission shaft in which a central portion bulges outward in the radial direction from both end portions. To aim.
  • a mandrel according to the present invention is a mandrel made of fiber reinforced plastic and used for manufacturing a tubular body used for a power transmission shaft, and a body part around which continuous fibers impregnated with a resin are wound.
  • the body portion is formed of a material that expands by heating, and the body portion has a larger expansion amount at the time of heating in the central portion than in both end portions.
  • the body portion is formed into a so-called barrel shape (barrel shape) by heating, it is possible to manufacture a tubular body in which the central portion bulges outward in the radial direction from both end portions. Moreover, since the central portion of the body portion is reduced in diameter by cooling, the mandrel can be pulled out from the tubular body.
  • the power transmission shaft 101 is a propeller shaft mounted on an FF (Front-engine Front-drive)-based four-wheel drive vehicle.
  • the power transmission shaft 101 includes a substantially cylindrical tubular body 102 extending in the front-rear direction of the vehicle, a stub yoke 103 of a cardan joint joined to the front end of the tubular body 102, and a constant velocity joint joined to the rear end of the tubular body 102.
  • the stub yoke 103 is a connecting member that connects the transmission mounted on the front part of the vehicle body and the tube body 102.
  • the stub shaft 104 is a connecting member that connects the final reduction gear device mounted on the rear portion of the vehicle body and the pipe body 102.
  • the power transmission shaft 101 rotates around the axis O1 and transmits the power to the final reduction gear transmission.
  • the tube body 102 is formed of carbon fiber reinforced plastic (CFRP).
  • CFRP carbon fiber reinforced plastic
  • the fibers used for the fiber-reinforced plastic in the present invention are not limited to carbon fibers and may be glass fibers or aramid fibers.
  • the tube body 102 includes a main body portion 110 occupying most of the pipe body 102, a first connecting portion 120 arranged on the front side of the main body portion 110, and a second connecting portion 130 arranged on the rear side of the main body portion 110.
  • the inclined portion 140 located between the main body portion 110 and the second connection portion 130.
  • the shape of the tube body 102 is exaggerated for easy understanding of the shape of the tube body 102.
  • the first connecting portion 120 is continuous with the front end portion (the other end portion) 111 of the main body portion 110, and the inclined portion 140 is provided with the rear end portion (one end portion) 112 of the main body portion 110. It is continuous.
  • the outer peripheral surface 114 and the inner peripheral surface 115 of the main body 110 have a circular cross-sectional shape.
  • the outer diameter of the main body portion 110 is reduced from the central portion 113 toward both end portions (the front end portion 111 and the rear end portion 112), and the outer diameter R1 of the central portion 113 is equal to both end portions (the front end portion 111). And larger than the outer diameter R2 of the rear end portion 112).
  • the inner diameter of the main body 110 is also reduced from the central portion 113 of the main body 110 toward both ends (the front end 111 and the rear end 112).
  • the cross-sectional shape of the outer peripheral surface 114 and the cross-sectional shape of the inner peripheral surface 115 of the main body 110 draw a gentle curve, and the central portion 113 projects outward. It has an arc shape. Therefore, the outer shape of the main body 110 has a barrel shape in which the central portion 113 bulges outward in the radial direction. Further, in the cross-sectional shape, the plate thickness of the main body part 110 becomes thinner from both end parts (the front end part 111 and the rear end part 112) toward the central part 113, and the plate thickness T1 of the central part 113 is It is thinner than the plate thickness T2 at both ends (front end 111 and rear end 112).
  • the shaft portion 103 a of the stub yoke 103 is fitted in the first connecting portion 120.
  • the outer peripheral surface of the shaft portion 103a is formed in a polygonal shape.
  • the inner peripheral surface of the first connecting portion 120 is formed in a polygonal shape following the outer peripheral surface of the shaft portion 103a. Therefore, the stub yoke 103 and the tube body 102 are configured so as not to rotate relative to each other.
  • the shaft portion 104a of the stub shaft 104 is fitted in the second connecting portion 130.
  • the outer peripheral surface of the shaft portion 104a is formed in a polygonal shape.
  • the inner peripheral surface of the second connecting portion 130 is formed in a polygonal shape following the outer peripheral surface of the shaft portion 104a. Therefore, the stub shaft 104 and the tube body 102 are configured so as not to rotate relative to each other.
  • the outer diameter of the inclined portion 140 gradually decreases from the main body portion 110 toward the first connection portion 120, and has a truncated cone shape.
  • the plate thickness of the inclined portion 140 gradually decreases from the end portion on the second connection portion 130 side (rear side) toward the end portion on the main body 110 side (front side). For this reason, the plate thickness of the front end portion of the inclined portion 140 is the thinnest and constitutes a weak portion. From the above, when the vehicle is collided from the front and a collision load is input to the power transmission shaft 101, a shearing force acts on the inclined portion 140 inclined with respect to the axis O1.
  • the front end portion (fragile portion) of the inclined portion 140 is damaged. Therefore, at the time of a vehicle collision, the engine and the transmission mounted on the front portion of the vehicle body quickly move backward, and the collision energy is absorbed by the front portion of the vehicle body.
  • the central portion 113 of the main body 110 where the bending stress is likely to concentrate has the outer diameter R1 formed large and has a predetermined bending strength.
  • the outer diameters R2 of the both end portions (the front end portion 111 and the rear end portion 112) of the main body portion 110 where the bending stress is hard to concentrate are formed to have a small outer diameter R2, thereby reducing the weight.
  • the central portion 113 of the main body 110 has a thin plate thickness T1 and is light in weight. Therefore, in the tubular body 102, the main body 110 is lightened while ensuring a predetermined bending rigidity of the central portion 113, and the bending primary resonance point of the main body 110 is improved.
  • the mandrel 1 of the first embodiment includes a substantially cylindrical body portion 2 and a pair of shaft portions 3 protruding from both ends of the body portion 2.
  • the pair of shaft portions 3 is configured to be hooked on another device to float the body portion 2. Therefore, the present invention may be configured by only the body portion 2.
  • the body 2 is a core material around which a continuous carbon fiber impregnated with resin or a prepreg (a sheet in which carbon fiber is impregnated with resin) is wound.
  • the body portion 2 has a cylindrical columnar portion 4, a reduced diameter portion 5 that gradually reduces its diameter as it is separated from the one end portion 4c of the cylindrical portion 4, and a cylindrical portion 4 that is located on one end side of the reduced diameter portion 5 And a small diameter portion 6 having a small diameter.
  • the other end 4 a of the columnar portion 4 is a portion that forms the first connecting portion 120.
  • a region from the central portion 4b to the one end portion 4c of the columnar portion 4 is a portion forming the main body portion 110.
  • the outer diameter of the cylindrical portion 4 is r1 and has the same diameter from one end side to the other end side.
  • the outer diameter r1 of the cylindrical portion 4 is the maximum outer diameter of the body portion 2.
  • the reduced diameter portion 5 is a portion forming the inclined portion 140, and the small diameter portion 6 is a portion forming the second connection portion 130.
  • the body 2 is made of a metal material and expands by heating (see the chain double-dashed line M in FIG. 3 ). Therefore, the outer diameter of the body portion 2 is formed smaller than the inner diameter of the tubular body 102.
  • the body 2 includes a portion formed of the first metal material 7 and a portion formed of the second metal material 8 having a thermal expansion coefficient higher than that of the first metal material 7.
  • Each of the other end 4 a, the reduced diameter portion 5 and the small diameter portion 6 of the columnar portion 4 is formed of the first metal material 7.
  • the outer peripheral portion of the region from the central portion 4b to the one end portion 4c of the columnar portion 4 is formed of the second metal material 8.
  • the portion formed of the second metal material 8 will be referred to as the expansion portion 9. Therefore, in the body portion 2, the central portion (expansion portion 9) expands at the time of heating rather than the one end portion (the reduced diameter portion 5 and the small diameter portion 6) and the other end portion (the other end portion 4a of the cylindrical portion 4). The amount is large (see the chain double-dashed line M in FIG. 3).
  • the inner peripheral surface 9a of the inflating portion 9 projects radially inward as it goes to the central portion in the direction of the axis O2.
  • the cross-sectional shape when the inner peripheral surface 9a of the inflating portion 9 is cut along the axis O2 has a gentle curve, and the central portion has an arc shape projecting inward. That is, the cross-sectional shape of the inflating section 9 is arcuate. For this reason, when the expansion section 9 is heated, the outer peripheral surface 9b of the expansion section 9 projects outward in the radial direction at the central portion rather than at both ends in the direction of the axis O2.
  • the cross-sectional shape of the outer peripheral surface 9b at the time of expansion is a gentle curve, and has a circular arc shape in which the central portion projects outward (see the chain double-dashed line M in FIG. 3).
  • the manufacturing method of the tubular body 102 includes a winding step of winding a material around the mandrel 1 (step S1), a heating step of heating the material and the mandrel 1 (step S2), and a cooling step of cooling the mandrel 1.
  • step S3 and the core removing process (step S4) of pulling out the mandrel 1 from the tubular body 102 are provided.
  • step S1 the mandrel 1 is mounted on the rotating device 10 and the release agent is applied to the outer peripheral surface of the mandrel 1. Then, the rotating device 10 is driven to rotate the mandrel 1, and the material forming the tubular body 102 is wound around the outer peripheral side of the mandrel 1 to form the intermediate product 11 (see FIG. 5).
  • the rotating device 10 is a device that includes a drive source (not shown) that detachably supports the pair of shaft portions 3 and that transmits power to the shaft portions 3 to rotate the mandrel 1 around the axis O2.
  • a drive source not shown
  • Examples of the material forming the tube body 102 include resin-impregnated continuous carbon fiber or prepreg (sheet in which carbon fiber is impregnated with resin). That is, the mandrel 1 can be used for the filament winding method or the sheet winding method.
  • the mandrel 1 is rotated to wind the resin-impregnated continuous carbon fiber around the mandrel 1 to form a first molded body.
  • the mandrel 1 is continuously rotated to wind the prepreg around the outer periphery of the first molded body. Therefore, the tubular body 102 is manufactured by adopting two construction methods of the filament winding method and the sheet winding method.
  • the first molded body manufactured by the filament winding method has high mechanical strength (particularly torsion strength) because the continuity of the fibers (carbon fibers) is maintained.
  • the sheet winding method it is possible to arrange the carbon fibers so as to extend in the axial direction of the mandrel, and it is possible to manufacture the second molded body having high elasticity in the axial O1 direction. That is, according to the manufacturing method described above, the fiber layer made of the fibers wound around the axis O1 and the fiber layer made of the fibers extending in the direction of the axis O1 are laminated inside the tubular body 102. Therefore, the tubular body 2 having high mechanical strength and high elasticity in the direction of the axis O1 can be manufactured.
  • the fibers oriented in the circumferential direction are preferably PAN (Polyacrylonitrile) fibers, and the fibers oriented in the axis O1 direction are preferably pitch fibers.
  • a cylindrical intermediate product 11 is formed on the outer peripheral side of the mandrel 1 along the outer peripheral shape of the mandrel 1.
  • the intermediate product 11 includes an intermediate first connecting portion 12 formed on the other end portion 4a of the columnar portion 4, an intermediate main body portion 13 formed on the expansion portion 9, and an intermediate inclined portion formed on the reduced diameter portion 5. 14 and an intermediate second connecting portion 15 formed on the small diameter portion 6.
  • the thickness W1 of the intermediate product 11 in the radial direction is formed so as to be uniform in each of the cylindrical portion 4, the reduced diameter portion 5, and the small diameter portion 6. Further, when winding the prepreg around the mandrel 1, the prepreg may be wound while pressing the mandrel 1 with a roller.
  • the mandrel 1 and the intermediate product 11 are heated at a predetermined temperature by a heating device to cure the resin and mold the resin.
  • the predetermined temperature varies depending on the thermosetting resin used and is approximately 130° to 180°.
  • the oven 20 is used as a heating device.
  • the mandrel 1 and the intermediate product 11 are carried into the oven 20 and fired at a predetermined temperature.
  • the mandrel 1 is heated in the process of hardening the resin of the intermediate product 11. Therefore, the other end portion 4a of the columnar portion 4 formed of the first metal material 7 slightly bulges outward in the radial direction, and the outer diameter becomes r2. Similarly, the reduced diameter portion 5 and the small diameter portion 6 also slightly bulge outward in the radial direction. Therefore, in the step, in the intermediate product 11, the intermediate first connecting portion 12, the intermediate inclined portion 14, and the intermediate second connecting portion 15 are slightly expanded in diameter and the resin is cured, so that The one connection part 120, the inclined part 140, and the second connection part 130 are formed.
  • the central portion in the direction of the axis O2 greatly expands radially outward.
  • the cross-sectional shape of the outer peripheral surface 9b of the inflating portion 9 is an arc shape that projects outward toward the central portion in the direction of the axis O2. Therefore, in this step, the resin is cured while the diameter of the intermediate main body portion 13 is greatly expanded, and the main body portion 110 is formed so that the sectional shape in the direction of the axis O2 becomes an arc shape.
  • the body portion 2 bulges outward in the radial direction, so that the thickness of the power transmission shaft 101 becomes smaller than the thickness W1 of the intermediate product 11 (see FIG. 5).
  • the thickness W2 of the main body portion 110 increases from the end portion of the main body portion 110 toward the central portion of the main body portion 110. It becomes thinner as you take it.
  • step S3 the mandrel 1 is cooled and the mandrel 1 is returned to the initial shape.
  • the pair of shaft portions 3 are placed on the suspension base 21, and the mandrel 1 is exposed to the atmosphere to radiate heat.
  • the mandrel 1 is reduced, and the gap C1 is formed between the outer peripheral surface of the mandrel 1 and the inner peripheral surface of the tubular body 102.
  • the outer diameter r1 of the cylindrical portion 4 of the mandrel 1 is smaller than the inner diameter r2 (see FIG. 6) of the first connecting portion 120.
  • step S4 the mandrel 1 is pulled out from the opening of the power transmission shaft 101 on the side of the first connecting portion 120, and the power transmission shaft 101 and the mandrel 1 are separated.
  • the maximum outer diameter of the mandrel 1 is the outer diameter r1 of the cylindrical portion 4 (see FIGS. 3 and 7), and is smaller than the inner diameter r2 of the first connecting portion 120. Therefore, the mandrel 1 can be smoothly pulled out without being caught by the inner peripheral surface of the tubular body 102.
  • the tubular body 102 in which the central portion (main body portion 110) is bulged outward in the radial direction from both end portions (the first connecting portion 120 and the second connecting portion 130) is manufactured. can do.
  • the mandrel 1 can be decoreed from the tube 102 without breaking it, the cost is reduced as compared with a core material such as a sand mold or a melting member that is broken each time the tube 102 is manufactured. be able to.
  • the mandrel 31 of the second embodiment includes a body portion 32 having a circular outer peripheral shape, and a pair of shaft portions 3 protruding from both ends of the body portion 2.
  • the body portion 32 is a cylindrical portion 34, a reduced diameter portion 35 that gradually reduces in diameter as it is separated from the one end portion 34 c of the cylindrical portion 34, and is located on one end side of the reduced diameter portion 35 from the cylindrical portion 34.
  • a small diameter portion 36 having a small diameter.
  • the other end 34a of the cylindrical portion 34 is a portion that forms the first connection portion 120 (see FIG. 1).
  • a region of the cylindrical portion 34 from the central portion 34b to the one end portion 34c is a portion forming the main body portion 110 (see FIG. 1).
  • the outer diameter r3 of the cylindrical portion 34 is the same from the one end side to the other end side.
  • the reduced diameter portion 35 is a portion that forms the inclined portion 140 (see FIG. 1)
  • the small diameter portion 36 is a portion that forms the second connection portion 130 (see FIG. 1).
  • Each configuration of the body portion 32 is formed of the same metal material and expands by heating (see the chain double-dashed line L in FIG. 8 ). Therefore, the outer diameter of the body portion 2 is formed smaller than the inner diameter of the power transmission shaft 101.
  • Each of the cylindrical portion 34, the reduced diameter portion 35, and the small diameter portion 36 has a space C2 formed therein and has a hollow shape.
  • the other end portion 34a of the cylindrical portion 34 has a thickness W3 in the radial direction, which is relatively thin.
  • the radial thicknesses of the reduced diameter portion 35 and the small diameter portion 36 are also W3.
  • the region of the cylindrical portion 34 from the central portion 34b to the one end portion 34c has a thickness W4, and constitutes a thick portion 39 that is thicker than other portions.
  • the inner peripheral surface 39a of the thick portion 39 projects inward in the radial direction toward the center of the thick portion 39.
  • the cross-sectional shape of the inner peripheral surface 39a when the inner peripheral surface 39a is cut along the axis O2 is a gentle curve, and the central portion thereof has an arc shape protruding inward. That is, the cross-sectional shape of the thick portion 39 is arcuate.
  • the respective portions of the cylindrical portion 34, the reduced diameter portion 35, and the small diameter portion 36 swell outward in the radial direction in the heating step (step S2).
  • the thick portion 39 has a large thickness W4
  • the amount of expansion that bulges outward in the radial direction is large. Therefore, it is possible to manufacture the tubular body 102 in which the central portion (main body portion 110) bulges outward in the radial direction from both end portions (the first connecting portion 120 and the second connecting portion 130).
  • the outer peripheral surface 39b of the thick part 39 at the time of expansion becomes circular arc shape. Therefore, it is possible to form the main body 110 having an arc-shaped cross section in the direction of the axis O2. Further, according to the above configuration, the expansion amount in the thick portion 39 is larger in the central portion than in the end portion in the direction of the axis O1. Therefore, it is possible to form the main body 110 that becomes thinner from the end of the axis O1 toward the center. Further, according to the present embodiment, since the core body can be decoreed from the pipe body 102 without breaking the mandrel 31, the cost is reduced as compared with the core material such as a sand mold or a melting member that is broken every time the pipe body 102 is manufactured. be able to.
  • the mandrel 41 of the third embodiment includes a substantially cylindrical body portion 2, a pair of shaft portions 3 protruding from both ends of the body portion 2, and a heating device arranged in the body portion 2. And 42. Since the body 2 and the shaft 3 have been described in the first embodiment, the description will focus on the heating device 42.
  • the heating device 42 is a device that is disposed inside the body portion 2 and heats the body portion 2 to heat the resin-impregnated continuous carbon fiber or prepreg wound around the outer peripheral side of the body portion 2. ..
  • the heating device 42 of the present embodiment is a heating wire and extends over the entire body 2 along the axis O2 to heat the entire body 2.
  • the manufacturing method of the tubular body 102 includes a winding step (step S1), a heating step (step S2), a cooling step (step S3), and a decoreing step (step S4) (see FIG. 4).
  • the only difference from the first embodiment is the heating step (step S2).
  • the heating process (step S2) at the changed point will be described.
  • step S2 in the heating step (step S2), the mandrel 41 and the intermediate product 11 are placed in the outer mold 50, and the heating device 42 is driven to heat the mandrel 41 and the intermediate product 11.
  • the cavity surface 51 of the outer die 50 has the same shape as the outer shape of the tubular body 102. According to the above process, the body 2 heated by the heating device 42 expands, and the intermediate product 11 expands radially outward. When the expansion amount of the body portion 2 reaches a predetermined amount, the intermediate product 11 comes into contact with the cavity surface 51 of the outer mold 50, and the expansion of the intermediate product 11 stops.
  • the tube body 102 in which the central portion (main body portion 110) is bulged outward in the radial direction from both end portions (the first connecting portion 120 and the second connecting portion 130). Further, according to the mandrel 41 of the third embodiment, it is not necessary to use the oven 20 or the like in the heating step (step S2) of the method for manufacturing the power transmission shaft 101. Further, since the outer mold 50 is used, the expansion of the intermediate product 11 is limited by the outer mold 50. Therefore, the shape of the tubular body 102 can be made more desired.
  • the outer peripheral shapes of the other end portion 4a of the columnar portion 4 and the small diameter portion 6 may be polygonal. According to this, the inner peripheral shapes of the first connecting portion 120 and the second connecting portion 130 are formed in a polygonal shape. Therefore, it is possible to save the labor of separately molding the first connecting portion 120 and the second connecting portion 130 into a polygonal shape.
  • the cross-sectional shape of the main body portion 110 taken along the axis O1 direction is not limited to the arc shape.
  • the cross-sectional shape of the main body 110 taken along the axis O1 may be stepwise. That is, in the mandrel of the present invention, the cross-sectional shape of the expanded portion 9 and the thick portion 39 when expanded along the axis O2 may be stepwise.
  • outer die 50 is used in the mandrel 41 of the third embodiment, the outer die 50 is used when manufacturing the tubular body 102 with the mandrel 1 of the first embodiment or the mandrel 31 of the second embodiment. Good.
  • the tube body manufactured by the mandrel is not limited to the above.
  • the plate thickness may be gradually reduced from the end portion on the main body portion 110 side (front side) toward the end portion on the second connection portion 130 side (rear side). According to this, the plate thickness of the rear end portion of the inclined portion is thinnest, and the rear end portion of the inclined portion constitutes the fragile portion.
  • a fragile portion may be formed by providing a recess on the outer peripheral surface or the inner peripheral surface and changing the plate thickness of a partial section.

Abstract

The present invention is a mandrel (1) made of fiber-reinforced plastic and used in the production of a tube (102) used in a power transmission shaft (101), wherein the mandrel is provided with a body portion around which continuous fibers impregnated with resin are wound, the body portion (2) is formed from a material that expands upon heating, and the amount of expansion of the body portion (2) during heating is greater at the center portion than at both end portions (4a), (5), (6).

Description

マンドレルMandrel
　本発明は、動力伝達軸に用いられる管体の製造に用いられるマンドレルに関する。 The present invention relates to a mandrel used for manufacturing a tubular body used for a power transmission shaft.
　車両に搭載される動力伝達軸（プロペラシャフト）は、車両の前後方向に延在する管体を備え、この管体により原動機で発生し変速機で減速された動力を終減速装置に伝達している。
　このような動力伝達軸に用いられる管体として、繊維強化プラスチックで形成されたものがある。繊維強化プラスチック製であって動力伝達軸に用いられる管体の製造方法は、例えば、熱硬化性樹脂を含浸した連続繊維をマンドレルに何重にも巻き付けて筒状の成形体を形成する。その後、成形体を加熱し樹脂を硬化させ、筒状の管体が形成される。その後、硬化した管体の端部の開口からマンドレルを引き抜き、製造工程が終了する（下記特許文献１参照）。 A power transmission shaft (propeller shaft) mounted on a vehicle includes a tube body extending in the front-rear direction of the vehicle, and transmits the power generated by the prime mover and decelerated by the transmission to the final reduction gear by the tube body. There is.
As a tubular body used for such a power transmission shaft, there is a tubular body formed of fiber reinforced plastic. In a method for manufacturing a tubular body made of fiber reinforced plastic and used for a power transmission shaft, for example, continuous fibers impregnated with a thermosetting resin are wound around a mandrel in multiple layers to form a tubular molded body. Then, the molded body is heated to cure the resin, and a tubular body is formed. Then, the mandrel is pulled out from the opening at the end of the cured tube, and the manufacturing process ends (see Patent Document 1 below).
特開平３－２６５７３８号公報JP-A-3-265738
　ところで、管体の形状に関し、近年、両端部よりも中央部の方が径方向外側に膨らんだいわゆる樽形状（バレル形状）とすることが研究されている。
　しかしながら、樽形状のマンドレルを用いて上記形状の管体を形成しようとすると、マンドレルの中央部が外側に膨らみ、管体の開口を通過できず、管体からマンドレルを引き抜くことができない。 By the way, as for the shape of the tubular body, in recent years, it has been studied that the central portion has a so-called barrel shape (barrel shape) that bulges outward in the radial direction rather than both ends.
However, if the barrel-shaped mandrel is used to form the tubular body having the above-described shape, the central portion of the mandrel bulges outward and cannot pass through the opening of the tubular body, and the mandrel cannot be pulled out from the tubular body.
　本発明は、このような課題を解決するために創作されたものであり、両端部よりも中央部が径方向外側に膨らんだ動力伝達軸に用いられる管体を製造できるマンドレルを提供することを目的とする。 The present invention was created in order to solve such a problem, and provides a mandrel capable of manufacturing a tubular body used for a power transmission shaft in which a central portion bulges outward in the radial direction from both end portions. To aim.
　前記課題を解決するため、本発明に係るマンドレルは、繊維強化プラスチック製であって動力伝達軸に用いられる管体の製造に用いられるマンドレルであって、樹脂を含浸した連続繊維が巻き付けられる胴部を備え、前記胴部は、加熱により膨張する材料により形成され、前記胴部は、両端部よりも中央部の方が加熱時の膨張量が大きいことを特徴とする。 In order to solve the above problems, a mandrel according to the present invention is a mandrel made of fiber reinforced plastic and used for manufacturing a tubular body used for a power transmission shaft, and a body part around which continuous fibers impregnated with a resin are wound. The body portion is formed of a material that expands by heating, and the body portion has a larger expansion amount at the time of heating in the central portion than in both end portions.
　本発明によれば、加熱により胴部がいわゆる樽形状（バレル形状）となるため、両端部よりも中央部が径方向外側に膨らんだ管体を製造できる。また、冷却により胴部の中央部が縮径するため、管体からマンドレルを引き抜くことができる。 According to the present invention, since the body portion is formed into a so-called barrel shape (barrel shape) by heating, it is possible to manufacture a tubular body in which the central portion bulges outward in the radial direction from both end portions. Moreover, since the central portion of the body portion is reduced in diameter by cooling, the mandrel can be pulled out from the tubular body.
動力伝達軸を側面視した側面図である。It is the side view which carried out the side view of the power transmission shaft. 管体の本体部を軸線方向に切った断面図である。It is sectional drawing which cut|disconnected the main-body part of a pipe body in the axial direction. 第一実施形態のマンドレルの側面図であり、詳細には巻き付け工程で回転装置に装着された状態の側面図である。It is a side view of the mandrel of 1st embodiment, and is a side view of the state attached to the rotating device in detail in the winding step. 第一実施形態に係る動力伝達軸に用いられる管体の製造工程を示すフローチャートである。It is a flow chart which shows a manufacturing process of a pipe used for a power transmission shaft concerning a first embodiment. 第一実施形態のマンドレルを用いた製造方法であって、巻き付け工程の終了時の状態を示す側面図である。It is a manufacturing method using the mandrel of 1st embodiment, Comprising: It is a side view which shows the state at the time of the end of a winding process. 第一実施形態のマンドレルを用いた製造方法であって、加熱工程時の状態を示す側面図である。It is a manufacturing method using the mandrel of 1st embodiment, It is a side view which shows the state at the time of a heating process. 第一実施形態のマンドレルを用いた製造方法であって、冷却工程時の状態を示す側面図である。It is a manufacturing method using the mandrel of 1st embodiment, It is a side view which shows the state at the time of a cooling process. 第一実施形態のマンドレルを用いた製造方法であって、脱芯工程時の状態を示す側面図である。It is a manufacturing method using the mandrel of 1st embodiment, Comprising: It is a side view which shows the state at the time of a core removal process. 第二実施形態のマンドレルの側面図である。It is a side view of a mandrel of a second embodiment. 第三実施形態のマンドレルの側面図である。It is a side view of a mandrel of a third embodiment. 第三実施形態のマンドレルを用いた製造方法であって、加熱工程時の状態を示す側面図である。It is a manufacturing method using the mandrel of 3rd embodiment, It is a side view which shows the state at the time of a heating process.
　次に、各実施形態のマンドレルについて、図面を参照しながら説明する。各実施形態で共通する技術的要素には、共通の符号を付し、説明を省略する。最初にマンドレルにより製造される動力伝達軸について説明する。 Next, the mandrel of each embodiment will be described with reference to the drawings. The technical elements common to the respective embodiments are designated by the common reference numerals, and the description thereof will be omitted. First, the power transmission shaft manufactured by the mandrel will be described.
［動力伝達軸］
　図１に示すように、動力伝達軸１０１は、ＦＦ（Ｆｒｏｎｔ－ｅｎｇｉｎｅ　Ｆｒｏｎｔ－ｄｒｉｖｅ）ベースの四輪駆動車に搭載されるプロペラシャフトである。
　動力伝達軸１０１は、車両の前後方向に延在する略円筒状の管体１０２と、管体１０２の前端に接合するカルダンジョイントのスタブヨーク１０３と、管体１０２の後端に接合する等速ジョイントのスタブシャフト１０４と、を備えている。
　スタブヨーク１０３は、車体の前部に搭載された変速機と管体１０２とを連結する連結部材である。スタブシャフト１０４は、車体の後部に搭載された終減速装置と管体１０２とを連結する連結部材である。
　動力伝達軸１０１は、変速機から動力（トルク）が伝達されると軸線Ｏ１回りに回転し、その動力を終減速装置に伝達する。 [Power transmission shaft]
As shown in FIG. 1, the power transmission shaft 101 is a propeller shaft mounted on an FF (Front-engine Front-drive)-based four-wheel drive vehicle.
The power transmission shaft 101 includes a substantially cylindrical tubular body 102 extending in the front-rear direction of the vehicle, a stub yoke 103 of a cardan joint joined to the front end of the tubular body 102, and a constant velocity joint joined to the rear end of the tubular body 102. The stub shaft 104 of FIG.
The stub yoke 103 is a connecting member that connects the transmission mounted on the front part of the vehicle body and the tube body 102. The stub shaft 104 is a connecting member that connects the final reduction gear device mounted on the rear portion of the vehicle body and the pipe body 102.
When power (torque) is transmitted from the transmission, the power transmission shaft 101 rotates around the axis O1 and transmits the power to the final reduction gear transmission.
　管体１０２は、炭素繊維強化プラスチック（ＣＦＲＰ）により形成されている。なお、本発明において繊維強化プラスチックに使用される繊維は、炭素繊維に限られず、ガラス繊維やアラミド繊維であってもよい。
　管体１０２は、管体１０２の大部分を占める本体部１１０と、本体部１１０の前側に配置された第一接続部１２０と、本体部１１０の後側に配置された第二接続部１３０と、本体部１１０と第二接続部１３０との間に位置する傾斜部１４０と、を備えている。 The tube body 102 is formed of carbon fiber reinforced plastic (CFRP). The fibers used for the fiber-reinforced plastic in the present invention are not limited to carbon fibers and may be glass fibers or aramid fibers.
The tube body 102 includes a main body portion 110 occupying most of the pipe body 102, a first connecting portion 120 arranged on the front side of the main body portion 110, and a second connecting portion 130 arranged on the rear side of the main body portion 110. The inclined portion 140 located between the main body portion 110 and the second connection portion 130.
　なお、図２以降の図面においては、管体１０２の形状を分かり易くするため、管体１０２の形状を誇張して描写している。
　図２に示すように、本体部１１０の前端部（他端部）１１１には、第一接続部１２０が連続し、本体部１１０の後端部（一端部）１１２には、傾斜部１４０が連続している。 In addition, in the drawings after FIG. 2, the shape of the tube body 102 is exaggerated for easy understanding of the shape of the tube body 102.
As shown in FIG. 2, the first connecting portion 120 is continuous with the front end portion (the other end portion) 111 of the main body portion 110, and the inclined portion 140 is provided with the rear end portion (one end portion) 112 of the main body portion 110. It is continuous.
　軸線Ｏ１を法線とする平面で本体部１１０を切った場合、本体部１１０の外周面１１４の断面形状及び内周面１１５の断面形状は、円形状となっている。本体部１１０の外径は、中央部１１３から両端部（前端部１１１及び後端部１１２）に向うに連れて縮径しており、中央部１１３の外径Ｒ１は、両端部（前端部１１１及び後端部１１２）の外径Ｒ２よりも大きい。なお、本体部１１０の内径も、本体部１１０の中央部１１３から両端部（前端部１１１及び後端部１１２）に向うに連れて縮径している。 When the main body 110 is cut along a plane that is normal to the axis O1, the outer peripheral surface 114 and the inner peripheral surface 115 of the main body 110 have a circular cross-sectional shape. The outer diameter of the main body portion 110 is reduced from the central portion 113 toward both end portions (the front end portion 111 and the rear end portion 112), and the outer diameter R1 of the central portion 113 is equal to both end portions (the front end portion 111). And larger than the outer diameter R2 of the rear end portion 112). The inner diameter of the main body 110 is also reduced from the central portion 113 of the main body 110 toward both ends (the front end 111 and the rear end 112).
　軸線Ｏ１に沿って本体部１１０を切った場合、本体部１１０の外周面１１４の断面形状及び内周面１１５の断面形状は、緩やかな曲線を描き、中央部１１３が外側に向けて突出する円弧状となっている。よって、本体部１１０の外形は、中央部１１３が径方向外側に膨らむ樽形状（バレル形状）となっている。また、その断面形状において、本体部１１０の板厚は、両端部（前端部１１１及び後端部１１２）から中央部１１３に向うに連れて薄くなっており、中央部１１３の板厚Ｔ１は、両端部（前端部１１１及び後端部１１２）の板厚Ｔ２よりも薄い。 When the main body 110 is cut along the axis O1, the cross-sectional shape of the outer peripheral surface 114 and the cross-sectional shape of the inner peripheral surface 115 of the main body 110 draw a gentle curve, and the central portion 113 projects outward. It has an arc shape. Therefore, the outer shape of the main body 110 has a barrel shape in which the central portion 113 bulges outward in the radial direction. Further, in the cross-sectional shape, the plate thickness of the main body part 110 becomes thinner from both end parts (the front end part 111 and the rear end part 112) toward the central part 113, and the plate thickness T1 of the central part 113 is It is thinner than the plate thickness T2 at both ends (front end 111 and rear end 112).
　図１に示すように、第一接続部１２０内には、スタブヨーク１０３のシャフト部１０３ａが嵌め込まれている。シャフト部１０３ａの外周面は、多角形状に形成されている。第一接続部１２０の内周面は、シャフト部１０３ａの外周面に倣った多角形状に形成されている。このため、スタブヨーク１０３と管体１０２が互いに相対回転しないように構成されている。
　第二接続部１３０内には、スタブシャフト１０４のシャフト部１０４ａが嵌め込まれている。シャフト部１０４ａの外周面は、多角形状に形成されている。第二接続部１３０の内周面は、シャフト部１０４ａの外周面に倣った多角形状に形成されている。このため、スタブシャフト１０４と管体１０２とが互いに相対回転しないように構成されている。 As shown in FIG. 1, the shaft portion 103 a of the stub yoke 103 is fitted in the first connecting portion 120. The outer peripheral surface of the shaft portion 103a is formed in a polygonal shape. The inner peripheral surface of the first connecting portion 120 is formed in a polygonal shape following the outer peripheral surface of the shaft portion 103a. Therefore, the stub yoke 103 and the tube body 102 are configured so as not to rotate relative to each other.
The shaft portion 104a of the stub shaft 104 is fitted in the second connecting portion 130. The outer peripheral surface of the shaft portion 104a is formed in a polygonal shape. The inner peripheral surface of the second connecting portion 130 is formed in a polygonal shape following the outer peripheral surface of the shaft portion 104a. Therefore, the stub shaft 104 and the tube body 102 are configured so as not to rotate relative to each other.
　傾斜部１４０の外径は、本体部１１０から第一接続部１２０に向かうに連れて次第に縮径し、円錐台形状となっている。傾斜部１４０の板厚は、第二接続部１３０側（後側）の端部から本体部１１０側（前側）の端部に向かうに連れて漸次薄くなっている。このため、傾斜部１４０のうち前端部の板厚が最も薄く、脆弱部を構成している。
　以上から、車両が前方から衝突されて動力伝達軸１０１に衝突荷重が入力すると、軸線Ｏ１に対して傾斜する傾斜部１４０にせん断力が作用する。そして、傾斜部１４０に作用するせん断力が所定値を超えると、傾斜部１４０の前端部（脆弱部）が破損する。このため、車両衝突時、車体の前部に搭載されたエンジンや変速機は速やかに後退し、衝突エネルギーは車体の前部により吸収される。 The outer diameter of the inclined portion 140 gradually decreases from the main body portion 110 toward the first connection portion 120, and has a truncated cone shape. The plate thickness of the inclined portion 140 gradually decreases from the end portion on the second connection portion 130 side (rear side) toward the end portion on the main body 110 side (front side). For this reason, the plate thickness of the front end portion of the inclined portion 140 is the thinnest and constitutes a weak portion.
From the above, when the vehicle is collided from the front and a collision load is input to the power transmission shaft 101, a shearing force acts on the inclined portion 140 inclined with respect to the axis O1. When the shearing force acting on the inclined portion 140 exceeds a predetermined value, the front end portion (fragile portion) of the inclined portion 140 is damaged. Therefore, at the time of a vehicle collision, the engine and the transmission mounted on the front portion of the vehicle body quickly move backward, and the collision energy is absorbed by the front portion of the vehicle body.
　上記した管体１０２によれば、曲げ応力が集中し易い本体部１１０の中央部１１３は、外径Ｒ１が大径に形成され、所定の曲げ強度を有している。一方で、曲げ応力が集中し難い本体部１１０の両端部（前端部１１１及び後端部１１２）は、外径Ｒ２が小径に形成され、軽量化している。また、本体部１１０の中央部１１３は、板厚Ｔ１が薄く軽量化している。よって、管体１０２は、中央部１１３の所定の曲げ剛性を確保しつつ本体部１１０が軽量化しており、本体部１１０の曲げ一次共振点が向上している。 According to the above-described pipe body 102, the central portion 113 of the main body 110 where the bending stress is likely to concentrate has the outer diameter R1 formed large and has a predetermined bending strength. On the other hand, the outer diameters R2 of the both end portions (the front end portion 111 and the rear end portion 112) of the main body portion 110 where the bending stress is hard to concentrate are formed to have a small outer diameter R2, thereby reducing the weight. Further, the central portion 113 of the main body 110 has a thin plate thickness T1 and is light in weight. Therefore, in the tubular body 102, the main body 110 is lightened while ensuring a predetermined bending rigidity of the central portion 113, and the bending primary resonance point of the main body 110 is improved.
［第一実施形態］
　図３に示すように、第一実施形態のマンドレル１は、略円柱状の胴部２と、胴部２の両端から突出する一対の軸部３と、を備えている。
　なお、一対の軸部３は、他の装置に引っ掛けて胴部２を浮かせた状態にするための構成である。よって、本発明は、胴部２のみから構成されてもよい。
　胴部２は、樹脂を含浸した連続炭素繊維、或いはプリプレグ（炭素繊維に樹脂を含浸させたシート）を巻き付けるための芯材である。
　胴部２は、円柱状の円柱部４と、円柱部４の一端部４ｃから離間するに連れて次第に縮径する縮径部５と、縮径部５の一端側に位置し円柱部４よりも小径な小径部６と、を備えている。 [First embodiment]
As shown in FIG. 3, the mandrel 1 of the first embodiment includes a substantially cylindrical body portion 2 and a pair of shaft portions 3 protruding from both ends of the body portion 2.
The pair of shaft portions 3 is configured to be hooked on another device to float the body portion 2. Therefore, the present invention may be configured by only the body portion 2.
The body 2 is a core material around which a continuous carbon fiber impregnated with resin or a prepreg (a sheet in which carbon fiber is impregnated with resin) is wound.
The body portion 2 has a cylindrical columnar portion 4, a reduced diameter portion 5 that gradually reduces its diameter as it is separated from the one end portion 4c of the cylindrical portion 4, and a cylindrical portion 4 that is located on one end side of the reduced diameter portion 5 And a small diameter portion 6 having a small diameter.
　円柱部４の他端部４ａは、第一接続部１２０を形成する部位である。円柱部４のうち中央部４ｂから一端部４ｃまでの領域は、本体部１１０を形成する部位である。円柱部４の外径は、ｒ１であり、一端側から他端側にかけて同径となっている。なお、円柱部４の外径ｒ１は、胴部２の最大外径である。
　また、縮径部５は、傾斜部１４０を形成する部位であり、小径部６は、第二接続部１３０を形成する部位である。 The other end 4 a of the columnar portion 4 is a portion that forms the first connecting portion 120. A region from the central portion 4b to the one end portion 4c of the columnar portion 4 is a portion forming the main body portion 110. The outer diameter of the cylindrical portion 4 is r1 and has the same diameter from one end side to the other end side. The outer diameter r1 of the cylindrical portion 4 is the maximum outer diameter of the body portion 2.
The reduced diameter portion 5 is a portion forming the inclined portion 140, and the small diameter portion 6 is a portion forming the second connection portion 130.
　胴部２は、金属材料により形成され、加熱により膨張する（図３の二点鎖線Ｍ参照）。よって、胴部２の外径は、管体１０２の内径よりも小さく形成されている。
　胴部２は、第一金属材料７で形成された部位と、第一金属材料７よりも熱膨張率が大きい第二金属材料８で形成された部位と、を備えている。
　円柱部４の他端部４ａと縮径部５と小径部６とのそれぞれは、第一金属材料７で形成されている。一方で、円柱部４における中央部４ｂから一端部４ｃまでの領域の外周部は、第二金属材料８で形成されている。以下、第二金属材料８で形成された部位を膨張部９という。
　よって、胴部２は、一端部（縮径部５と小径部６）及び他端部（円柱部４の他端部４ａ、）よりも中央部（膨張部９）の方が加熱時の膨張量が大きい（図３の二点鎖線Ｍ参照）。 The body 2 is made of a metal material and expands by heating (see the chain double-dashed line M in FIG. 3 ). Therefore, the outer diameter of the body portion 2 is formed smaller than the inner diameter of the tubular body 102.
The body 2 includes a portion formed of the first metal material 7 and a portion formed of the second metal material 8 having a thermal expansion coefficient higher than that of the first metal material 7.
Each of the other end 4 a, the reduced diameter portion 5 and the small diameter portion 6 of the columnar portion 4 is formed of the first metal material 7. On the other hand, the outer peripheral portion of the region from the central portion 4b to the one end portion 4c of the columnar portion 4 is formed of the second metal material 8. Hereinafter, the portion formed of the second metal material 8 will be referred to as the expansion portion 9.
Therefore, in the body portion 2, the central portion (expansion portion 9) expands at the time of heating rather than the one end portion (the reduced diameter portion 5 and the small diameter portion 6) and the other end portion (the other end portion 4a of the cylindrical portion 4). The amount is large (see the chain double-dashed line M in FIG. 3).
　膨張部９の内周面９ａは、軸線Ｏ２方向の中央部に向うに連れて径方向内側に突出している。また、軸線Ｏ２に沿って膨張部９の内周面９ａを切った場合の断面形状は、緩やかな曲線を描いており、中央部が内側に向けて突出する円弧状となっている。つまり、膨張部９の断面形状は、弓形となっている。
　このため、膨張部９を加熱すると、膨張部９の外周面９ｂは、軸線Ｏ２方向の両端部よりも中央部の方が径方向外側に突出する。また、膨張時の外周面９ｂの断面形状は、緩やかな曲線を描き、中央部が外側に向けて突出する円弧状となる（図３の二点鎖線Ｍ参照）。 The inner peripheral surface 9a of the inflating portion 9 projects radially inward as it goes to the central portion in the direction of the axis O2. In addition, the cross-sectional shape when the inner peripheral surface 9a of the inflating portion 9 is cut along the axis O2 has a gentle curve, and the central portion has an arc shape projecting inward. That is, the cross-sectional shape of the inflating section 9 is arcuate.
For this reason, when the expansion section 9 is heated, the outer peripheral surface 9b of the expansion section 9 projects outward in the radial direction at the central portion rather than at both ends in the direction of the axis O2. Further, the cross-sectional shape of the outer peripheral surface 9b at the time of expansion is a gentle curve, and has a circular arc shape in which the central portion projects outward (see the chain double-dashed line M in FIG. 3).
　次に第一実施形態のマンドレル１を用いた管体１０２の製造方法について説明する。本実施形態では、管体１０２を形成する樹脂として熱硬化性樹脂を用いた場合を例に挙げて説明する。
　図４に示すように、管体１０２の製造方法は、マンドレル１に材料を巻き付ける巻き付け工程（ステップＳ１）と、材料及びマンドレル１を加熱する加熱工程（ステップＳ２）と、マンドレル１を冷却する冷却工程（ステップＳ３）と、管体１０２からマンドレル１を引き抜く脱芯工程（ステップＳ４）と、を備えている。 Next, a method of manufacturing the tubular body 102 using the mandrel 1 of the first embodiment will be described. In the present embodiment, a case where a thermosetting resin is used as the resin forming the tubular body 102 will be described as an example.
As shown in FIG. 4, the manufacturing method of the tubular body 102 includes a winding step of winding a material around the mandrel 1 (step S1), a heating step of heating the material and the mandrel 1 (step S2), and a cooling step of cooling the mandrel 1. The process (step S3) and the core removing process (step S4) of pulling out the mandrel 1 from the tubular body 102 are provided.
　図３に示すように、巻き付け工程（ステップＳ１）は、マンドレル１を回転装置１０に装着し、マンドレル１の外周面に離型剤を塗布する。そして、回転装置１０を駆動させてマンドレル１を回転し、管体１０２を形成する材料をマンドレル１の外周側に巻き付けて中間生成物１１（図５参照）を形成する工程である。 As shown in FIG. 3, in the winding step (step S1), the mandrel 1 is mounted on the rotating device 10 and the release agent is applied to the outer peripheral surface of the mandrel 1. Then, the rotating device 10 is driven to rotate the mandrel 1, and the material forming the tubular body 102 is wound around the outer peripheral side of the mandrel 1 to form the intermediate product 11 (see FIG. 5).
　回転装置１０は、一対の軸部３を着脱自在に支持するとともに、軸部３に動力を伝達しマンドレル１を軸線Ｏ２回りに回転させる駆動源（不図示）を備えた装置である。
　管体１０２を形成する材料は、樹脂を含浸した連続炭素繊維又はプリプレグ（炭素繊維に樹脂を含浸させたシート）が挙げられる。つまり、マンドレル１は、フィラメントワインディング法又はシートワインディング法に利用することができる。 The rotating device 10 is a device that includes a drive source (not shown) that detachably supports the pair of shaft portions 3 and that transmits power to the shaft portions 3 to rotate the mandrel 1 around the axis O2.
Examples of the material forming the tube body 102 include resin-impregnated continuous carbon fiber or prepreg (sheet in which carbon fiber is impregnated with resin). That is, the mandrel 1 can be used for the filament winding method or the sheet winding method.
　本実施形態の巻き付け方法は、マンドレル１を回転させて樹脂を含浸した連続炭素繊維をマンドレル１に巻き付け、第一成形体を形成する。次に、マンドレル１を引き続き回転させて第一成形体の外周にプリプレグを巻き付ける。よって、管体１０２は、フィラメントワインディング法とシートワインディング法との２つの工法を取り入れられて製造されている。
　ここで、フィラメントワインディング法によって製造される第一成形体は、繊維（炭素繊維）の連続性が保たれるため機械的強度（特にねじり強度）が高い。
　一方、シートワインディング法によれば、マンドレルの軸線方向に延在するように炭素繊維を配置することができ、軸線Ｏ１方向に高弾性化した第二成形体を製造できる。
　つまり、上記した製造方法によれば、管体１０２の内部で、軸線Ｏ１回りに巻回された繊維からなる繊維層と、軸線Ｏ１方向に延在する繊維からなる繊維層と、が積層しており、機械的強度が高く、かつ、軸線Ｏ１方向に高弾性化した管体２を製造できる。
　なお、周方向に配向する繊維としてＰＡＮ系（Ｐｏｌｙａｃｒｙｌｏｎｉｔｒｉｌｅ）繊維が好ましく、軸線Ｏ１方向に配向する繊維としてピッチ繊維が好ましい。 In the winding method of the present embodiment, the mandrel 1 is rotated to wind the resin-impregnated continuous carbon fiber around the mandrel 1 to form a first molded body. Next, the mandrel 1 is continuously rotated to wind the prepreg around the outer periphery of the first molded body. Therefore, the tubular body 102 is manufactured by adopting two construction methods of the filament winding method and the sheet winding method.
Here, the first molded body manufactured by the filament winding method has high mechanical strength (particularly torsion strength) because the continuity of the fibers (carbon fibers) is maintained.
On the other hand, according to the sheet winding method, it is possible to arrange the carbon fibers so as to extend in the axial direction of the mandrel, and it is possible to manufacture the second molded body having high elasticity in the axial O1 direction.
That is, according to the manufacturing method described above, the fiber layer made of the fibers wound around the axis O1 and the fiber layer made of the fibers extending in the direction of the axis O1 are laminated inside the tubular body 102. Therefore, the tubular body 2 having high mechanical strength and high elasticity in the direction of the axis O1 can be manufactured.
The fibers oriented in the circumferential direction are preferably PAN (Polyacrylonitrile) fibers, and the fibers oriented in the axis O1 direction are preferably pitch fibers.
　当該巻き付け工程（ステップＳ１）の終了時、図５に示すように、マンドレル１の外周側には、マンドレル１の外周形状に沿った筒状の中間生成物１１が形成される。
　中間生成物１１は、円柱部４の他端部４ａに形成された中間第一接続部１２と、膨張部９に形成された中間本体部１３と、縮径部５に形成された中間傾斜部１４と、小径部６に形成された中間第二接続部１５と、を備えている。
　なお、巻き付け工程（ステップＳ１）では、中間生成物１１の径方向の厚みＷ１に関し、円柱部４と縮径部５と小径部６との各部位において均一となるように形成されている。また、マンドレル１にプリプレグを巻き付ける際、プリプレグをローラでマンドレル１に押圧しながら巻き付けてもよい。 At the end of the winding step (step S1), as shown in FIG. 5, a cylindrical intermediate product 11 is formed on the outer peripheral side of the mandrel 1 along the outer peripheral shape of the mandrel 1.
The intermediate product 11 includes an intermediate first connecting portion 12 formed on the other end portion 4a of the columnar portion 4, an intermediate main body portion 13 formed on the expansion portion 9, and an intermediate inclined portion formed on the reduced diameter portion 5. 14 and an intermediate second connecting portion 15 formed on the small diameter portion 6.
In the winding step (step S1), the thickness W1 of the intermediate product 11 in the radial direction is formed so as to be uniform in each of the cylindrical portion 4, the reduced diameter portion 5, and the small diameter portion 6. Further, when winding the prepreg around the mandrel 1, the prepreg may be wound while pressing the mandrel 1 with a roller.
　図６に示すように、加熱工程（ステップＳ２）は、加熱装置によりマンドレル１及び中間生成物１１を所定温度で加熱して樹脂を硬化させ、樹脂を成形する。
　所定温度は、使用する熱硬化性樹脂によって異なり、大凡１３０°～１８０°である。
　本実施形態では、加熱装置としてオーブン２０を利用している。マンドレル１及び中間生成物１１は、オーブン２０内に搬入されて所定温度で焼成される。 As shown in FIG. 6, in the heating step (step S2), the mandrel 1 and the intermediate product 11 are heated at a predetermined temperature by a heating device to cure the resin and mold the resin.
The predetermined temperature varies depending on the thermosetting resin used and is approximately 130° to 180°.
In this embodiment, the oven 20 is used as a heating device. The mandrel 1 and the intermediate product 11 are carried into the oven 20 and fired at a predetermined temperature.
　当該工程によれば、中間生成物１１の樹脂が硬化する過程で、マンドレル１が加熱される。このため、第一金属材料７で形成された円柱部４の他端部４ａは、少し径方向外側に膨らみ、外径がｒ２となる。同様に、縮径部５及び小径部６も少し径方向外側に膨らむ。よって、当該工程においては、中間生成物１１のうち、中間第一接続部１２と中間傾斜部１４と中間第二接続部１５は、少し拡径しながら樹脂が硬化し、動力伝達軸１０１の第一接続部１２０と傾斜部１４０と第二接続部１３０が形成される。 According to the process, the mandrel 1 is heated in the process of hardening the resin of the intermediate product 11. Therefore, the other end portion 4a of the columnar portion 4 formed of the first metal material 7 slightly bulges outward in the radial direction, and the outer diameter becomes r2. Similarly, the reduced diameter portion 5 and the small diameter portion 6 also slightly bulge outward in the radial direction. Therefore, in the step, in the intermediate product 11, the intermediate first connecting portion 12, the intermediate inclined portion 14, and the intermediate second connecting portion 15 are slightly expanded in diameter and the resin is cured, so that The one connection part 120, the inclined part 140, and the second connection part 130 are formed.
　また、第二金属材料８で形成された膨張部９は、軸線Ｏ２方向の中央部が径方向外側に大きく膨らむ。また、膨張部９の外周面９ｂの断面形状は、軸線Ｏ２方向の中央部に向うに連れて外側に向けて突出するような円弧状となる。よって、当該工程において、中間本体部１３は、大きく拡径しながら樹脂が硬化するとともに、軸線Ｏ２方向の断面形状が円弧状となって本体部１１０が形成される。 Also, in the expanded portion 9 formed of the second metal material 8, the central portion in the direction of the axis O2 greatly expands radially outward. In addition, the cross-sectional shape of the outer peripheral surface 9b of the inflating portion 9 is an arc shape that projects outward toward the central portion in the direction of the axis O2. Therefore, in this step, the resin is cured while the diameter of the intermediate main body portion 13 is greatly expanded, and the main body portion 110 is formed so that the sectional shape in the direction of the axis O2 becomes an arc shape.
　また、当該工程では、胴部２が径方向外側に膨らむため、動力伝達軸１０１の厚みは、中間生成物１１の厚みＷ１（図５参照）よりも薄くなる。
　特に、膨張部９は、軸線Ｏ２方向の端部よりも中央部は径方向外側に大きく膨らむことから、本体部１１０の厚みＷ２は本体部１１０の端部から本体部１１０の中央部に向うに連れて次第に薄くなる。 Further, in this step, the body portion 2 bulges outward in the radial direction, so that the thickness of the power transmission shaft 101 becomes smaller than the thickness W1 of the intermediate product 11 (see FIG. 5).
In particular, since the central portion of the inflatable portion 9 bulges radially outward more than the end portion in the direction of the axis O2, the thickness W2 of the main body portion 110 increases from the end portion of the main body portion 110 toward the central portion of the main body portion 110. It becomes thinner as you take it.
　冷却工程（ステップＳ３）は、マンドレル１を冷却し、マンドレル１を初期の形状に戻す。実施形態では、図７に示すように、一対の軸部３を懸架台２１に載せ、マンドレル１を大気中に曝して放熱している。
　当該工程によれば、マンドレル１が縮小し、マンドレル１の外周面と管体１０２の内周面との間に隙間Ｃ１が形成される。また、マンドレル１の円柱部４の外径ｒ１は、第一接続部１２０の内径ｒ２（図６参照）よりも小さくなる。 In the cooling step (step S3), the mandrel 1 is cooled and the mandrel 1 is returned to the initial shape. In the embodiment, as shown in FIG. 7, the pair of shaft portions 3 are placed on the suspension base 21, and the mandrel 1 is exposed to the atmosphere to radiate heat.
According to this step, the mandrel 1 is reduced, and the gap C1 is formed between the outer peripheral surface of the mandrel 1 and the inner peripheral surface of the tubular body 102. Further, the outer diameter r1 of the cylindrical portion 4 of the mandrel 1 is smaller than the inner diameter r2 (see FIG. 6) of the first connecting portion 120.
　脱芯工程（ステップＳ４）は、図８に示すように、動力伝達軸１０１の第一接続部１２０側の開口からマンドレル１を引き抜き、動力伝達軸１０１とマンドレル１とを分離させる。
　ここで、マンドレル１の最大外径は、円柱部４の外径ｒ１であり（図３、図７参照）、第一接続部１２０の内径ｒ２よりも小さい。よって、マンドレル１が管体１０２の内周面に引っ掛かることなく、スムーズにマンドレル１を引き抜くことができる。 In the decoreing step (step S4), as shown in FIG. 8, the mandrel 1 is pulled out from the opening of the power transmission shaft 101 on the side of the first connecting portion 120, and the power transmission shaft 101 and the mandrel 1 are separated.
Here, the maximum outer diameter of the mandrel 1 is the outer diameter r1 of the cylindrical portion 4 (see FIGS. 3 and 7), and is smaller than the inner diameter r2 of the first connecting portion 120. Therefore, the mandrel 1 can be smoothly pulled out without being caught by the inner peripheral surface of the tubular body 102.
　以上から、第一実施形態のマンドレル１によれば、両端部（第一接続部１２０及び第二接続部１３０）よりも中央部（本体部１１０）が径方向外側に膨らんだ管体１０２を製造することができる。
　また、本実施形態によれば、マンドレル１を壊すことなく管体１０２から脱芯することができるため、管体１０２を製造する度に壊す砂型や溶融部材などの芯材よりもコストを低減することができる。 From the above, according to the mandrel 1 of the first embodiment, the tubular body 102 in which the central portion (main body portion 110) is bulged outward in the radial direction from both end portions (the first connecting portion 120 and the second connecting portion 130) is manufactured. can do.
In addition, according to the present embodiment, since the mandrel 1 can be decoreed from the tube 102 without breaking it, the cost is reduced as compared with a core material such as a sand mold or a melting member that is broken each time the tube 102 is manufactured. be able to.
［第二実施形態］
　次に第二実施形態のマンドレル３１を説明する。
　図８に示すように、第二実施形態のマンドレル３１は、外周形状が円形の胴部３２と、胴部２の両端から突出する一対の軸部３と、を備えている。
　胴部３２は、円筒状の円筒部３４と、円筒部３４の一端部３４ｃから離間するに連れて次第に縮径する縮径部３５と、縮径部３５の一端側に位置し円筒部３４よりも小径な小径部３６と、を備えている。 [Second embodiment]
Next, the mandrel 31 of the second embodiment will be described.
As shown in FIG. 8, the mandrel 31 of the second embodiment includes a body portion 32 having a circular outer peripheral shape, and a pair of shaft portions 3 protruding from both ends of the body portion 2.
The body portion 32 is a cylindrical portion 34, a reduced diameter portion 35 that gradually reduces in diameter as it is separated from the one end portion 34 c of the cylindrical portion 34, and is located on one end side of the reduced diameter portion 35 from the cylindrical portion 34. And a small diameter portion 36 having a small diameter.
　円筒部３４の他端部３４ａは、第一接続部１２０（図１参照）を形成する部位である。円筒部３４のうち中央部３４ｂから一端部３４ｃまでの領域は、本体部１１０（図１参照）を形成する部位である。円筒部３４の外径ｒ３は、一端側から他端側にかけて同径となっている。また、縮径部３５は、傾斜部１４０（図１参照）を形成する部位であり、小径部３６は、第二接続部１３０（図１参照）を形成する部位である。 The other end 34a of the cylindrical portion 34 is a portion that forms the first connection portion 120 (see FIG. 1). A region of the cylindrical portion 34 from the central portion 34b to the one end portion 34c is a portion forming the main body portion 110 (see FIG. 1). The outer diameter r3 of the cylindrical portion 34 is the same from the one end side to the other end side. Further, the reduced diameter portion 35 is a portion that forms the inclined portion 140 (see FIG. 1), and the small diameter portion 36 is a portion that forms the second connection portion 130 (see FIG. 1).
　胴部３２の各構成は、同一の金属材料により形成され、加熱により膨張する（図８の二点鎖線Ｌ参照）。よって、胴部２の外径は、動力伝達軸１０１の内径よりも小さく形成されている。
　円筒部３４と縮径部３５と小径部３６とのそれぞれは、内部に空間Ｃ２が形成され、中空状となっている。
　また、円筒部３４の他端部３４ａの径方向の厚みはＷ３となっており、比較的薄く形成されている。同様に、縮径部３５と小径部３６の径方向の厚みもＷ３となっている。
　一方で、円筒部３４における中央部３４ｂから一端部３４ｃまでの領域は、厚みがＷ４となっており、他の部位よりも厚い肉厚部３９を構成している。 Each configuration of the body portion 32 is formed of the same metal material and expands by heating (see the chain double-dashed line L in FIG. 8 ). Therefore, the outer diameter of the body portion 2 is formed smaller than the inner diameter of the power transmission shaft 101.
Each of the cylindrical portion 34, the reduced diameter portion 35, and the small diameter portion 36 has a space C2 formed therein and has a hollow shape.
The other end portion 34a of the cylindrical portion 34 has a thickness W3 in the radial direction, which is relatively thin. Similarly, the radial thicknesses of the reduced diameter portion 35 and the small diameter portion 36 are also W3.
On the other hand, the region of the cylindrical portion 34 from the central portion 34b to the one end portion 34c has a thickness W4, and constitutes a thick portion 39 that is thicker than other portions.
　肉厚部３９の内周面３９ａは、肉厚部３９の中央部に向うに連れて径方向内側に突出している。また、軸線Ｏ２に沿って内周面３９ａを切った場合の断面形状は、緩やかな曲線を描いており、中央部が内側に向けて突出する円弧状となっている。つまり、肉厚部３９の断面形状は、弓形となっている。 The inner peripheral surface 39a of the thick portion 39 projects inward in the radial direction toward the center of the thick portion 39. In addition, the cross-sectional shape of the inner peripheral surface 39a when the inner peripheral surface 39a is cut along the axis O2 is a gentle curve, and the central portion thereof has an arc shape protruding inward. That is, the cross-sectional shape of the thick portion 39 is arcuate.
　以上、第二実施形態のマンドレル３１によれば、加熱工程（ステップＳ２）で円筒部３４と縮径部３５と小径部３６の各部位が径方向外側に膨らむ。特に、肉厚部３９は、厚みＷ４が大きいことから、径方向外側に膨らむ膨張量が大きい。よって、両端部（第一接続部１２０及び第二接続部１３０）よりも中央部（本体部１１０）が径方向外側に膨らんだ管体１０２を製造することができる。 As described above, according to the mandrel 31 of the second embodiment, the respective portions of the cylindrical portion 34, the reduced diameter portion 35, and the small diameter portion 36 swell outward in the radial direction in the heating step (step S2). In particular, since the thick portion 39 has a large thickness W4, the amount of expansion that bulges outward in the radial direction is large. Therefore, it is possible to manufacture the tubular body 102 in which the central portion (main body portion 110) bulges outward in the radial direction from both end portions (the first connecting portion 120 and the second connecting portion 130).
　また、上記構成によれば、膨張時の肉厚部３９の外周面３９ｂが円弧状となる。よって、軸線Ｏ２方向の断面形状が円弧状の本体部１１０を形成することができる。
　また、上記構成によれば、肉厚部３９における膨張量は、軸線Ｏ１方向の端部よりも中央部の方が大きい。このため、軸線Ｏ１の端部から中央部に向うに肉薄となる本体部１１０を形成することができる。
　また、本実施形態によれば、マンドレル３１を壊すことなく管体１０２から脱芯することができるため、管体１０２を製造する度に壊す砂型や溶融部材などの芯材よりもコストを低減することができる。 Moreover, according to the said structure, the outer peripheral surface 39b of the thick part 39 at the time of expansion becomes circular arc shape. Therefore, it is possible to form the main body 110 having an arc-shaped cross section in the direction of the axis O2.
Further, according to the above configuration, the expansion amount in the thick portion 39 is larger in the central portion than in the end portion in the direction of the axis O1. Therefore, it is possible to form the main body 110 that becomes thinner from the end of the axis O1 toward the center.
Further, according to the present embodiment, since the core body can be decoreed from the pipe body 102 without breaking the mandrel 31, the cost is reduced as compared with the core material such as a sand mold or a melting member that is broken every time the pipe body 102 is manufactured. be able to.
［第三実施形態］
　次に第三実施形態のマンドレル４１を説明する。
　図１０に示すように、第三実施形態のマンドレル４１は、略円柱状の胴部２と、胴部２の両端から突出する一対の軸部３と、胴部２内に配置された加熱装置４２と、を備えている。胴部２及び軸部３は、第一実施形態で説明したため、加熱装置４２に絞って説明する。 [Third embodiment]
Next, the mandrel 41 of the third embodiment will be described.
As shown in FIG. 10, the mandrel 41 of the third embodiment includes a substantially cylindrical body portion 2, a pair of shaft portions 3 protruding from both ends of the body portion 2, and a heating device arranged in the body portion 2. And 42. Since the body 2 and the shaft 3 have been described in the first embodiment, the description will focus on the heating device 42.
　加熱装置４２は、胴部２の内部に配置されて胴部２を加熱することで、胴部２の外周側に巻き付けられた樹脂を含浸した連続炭素繊維やプリプレグを加熱するための装置である。本実施形態の加熱装置４２は、電熱線であり、軸線Ｏ２に沿って胴部２全体に延在し、胴部２全体を加熱する。 The heating device 42 is a device that is disposed inside the body portion 2 and heats the body portion 2 to heat the resin-impregnated continuous carbon fiber or prepreg wound around the outer peripheral side of the body portion 2. .. The heating device 42 of the present embodiment is a heating wire and extends over the entire body 2 along the axis O2 to heat the entire body 2.
　次に第三実施形態のマンドレル４１を用いた管体１０２の製造方法について説明する。
　管体１０２の製造方法は、巻き付け工程（ステップＳ１）と、加熱工程（ステップＳ２）と、冷却工程（ステップＳ３）と、脱芯工程（ステップＳ４）と、を備えており（図４参照）、第一実施形態との変更点は、加熱工程（ステップＳ２）のみである。以下、変更点の加熱工程（ステップＳ２）について説明する。 Next, a method of manufacturing the tubular body 102 using the mandrel 41 of the third embodiment will be described.
The manufacturing method of the tubular body 102 includes a winding step (step S1), a heating step (step S2), a cooling step (step S3), and a decoreing step (step S4) (see FIG. 4). The only difference from the first embodiment is the heating step (step S2). Hereinafter, the heating process (step S2) at the changed point will be described.
　図１１に示すように、加熱工程（ステップＳ２）では、マンドレル４１及び中間生成物１１を外型５０内に配置し、加熱装置４２を駆動させてマンドレル４１及び中間生成物１１を加熱する。なお、外型５０のキャビィテイ面５１は、管体１０２の外形と同形となっている。
　上記工程によれば、加熱装置４２により加熱された胴部２が膨張し、中間生成物１１が径方向外側に膨らむ。
　また、胴部２の膨張量が所定量となると、中間生成物１１が外型５０のキャビィテイ面５１に当接するようになり、中間生成物１１の膨張が停止する。 As shown in FIG. 11, in the heating step (step S2), the mandrel 41 and the intermediate product 11 are placed in the outer mold 50, and the heating device 42 is driven to heat the mandrel 41 and the intermediate product 11. The cavity surface 51 of the outer die 50 has the same shape as the outer shape of the tubular body 102.
According to the above process, the body 2 heated by the heating device 42 expands, and the intermediate product 11 expands radially outward.
When the expansion amount of the body portion 2 reaches a predetermined amount, the intermediate product 11 comes into contact with the cavity surface 51 of the outer mold 50, and the expansion of the intermediate product 11 stops.
　以上、第三実施形態においても、両端部（第一接続部１２０及び第二接続部１３０）よりも中央部（本体部１１０）が径方向外側に膨らんだ管体１０２を製造することができる。また、第三実施形態のマンドレル４１によれば、動力伝達軸１０１の製造方法の加熱工程（ステップＳ２）においてオーブン２０等を利用する必要がない。
　また、外型５０を用いているため、中間生成物１１の膨張が外型５０によって制限される。このため、管体１０２の形状をより所望のものとすることができる。 As described above, also in the third embodiment, it is possible to manufacture the tube body 102 in which the central portion (main body portion 110) is bulged outward in the radial direction from both end portions (the first connecting portion 120 and the second connecting portion 130). Further, according to the mandrel 41 of the third embodiment, it is not necessary to use the oven 20 or the like in the heating step (step S2) of the method for manufacturing the power transmission shaft 101.
Further, since the outer mold 50 is used, the expansion of the intermediate product 11 is limited by the outer mold 50. Therefore, the shape of the tubular body 102 can be made more desired.
　以上、各実施形態について説明したが、円柱部４の他端部４ａ及び小径部６の外周形状を多角形状にしてもよい。これによれば、第一接続部１２０及び第二接続部１３０の内周形状が多角形状に形成される。よって、別途に第一接続部１２０及び第二接続部１３０を多角形状に成形する手間を省くことができる。 Although the respective embodiments have been described above, the outer peripheral shapes of the other end portion 4a of the columnar portion 4 and the small diameter portion 6 may be polygonal. According to this, the inner peripheral shapes of the first connecting portion 120 and the second connecting portion 130 are formed in a polygonal shape. Therefore, it is possible to save the labor of separately molding the first connecting portion 120 and the second connecting portion 130 into a polygonal shape.
　また、本発明のマンドレルによって製造される動力伝達軸に関し、軸線Ｏ１方向に沿って切った本体部１１０の断面形状は円弧状のものに限定されない。例えば、軸線Ｏ１に沿って切った本体部１１０の断面形状が階段状となっていてもよい。つまり、本発明のマンドレルにおいて、軸線Ｏ２に沿って切った膨張時の膨張部９や肉厚部３９の断面形状が階段状をなしていてもよい。 Further, regarding the power transmission shaft manufactured by the mandrel of the present invention, the cross-sectional shape of the main body portion 110 taken along the axis O1 direction is not limited to the arc shape. For example, the cross-sectional shape of the main body 110 taken along the axis O1 may be stepwise. That is, in the mandrel of the present invention, the cross-sectional shape of the expanded portion 9 and the thick portion 39 when expanded along the axis O2 may be stepwise.
　また、第三実施形態のマンドレル４１において、外型５０を用いているが、第一実施形態のマンドレル１や第二実施形態のマンドレル３１で管体１０２を製造する場合に外型５０を用いてもよい。 Further, although the outer die 50 is used in the mandrel 41 of the third embodiment, the outer die 50 is used when manufacturing the tubular body 102 with the mandrel 1 of the first embodiment or the mandrel 31 of the second embodiment. Good.
　また、マンドレルによって製造される管体は、上記したものに限定されない。例えば、傾斜部に関し、板厚が本体部１１０側（前側）の端部から第二接続部１３０側（後側）の端部に向かうに連れて漸次薄くなっていてもよい。これによれば、傾斜部のうち後端部の板厚が最も薄くなり、傾斜部の後端部が脆弱部を構成する。若しくは、本発明の傾斜部は、外周面又は内周面に凹部を設けて一部区間の板厚を変化させて脆弱部を形成してもよい。 Also, the tube body manufactured by the mandrel is not limited to the above. For example, regarding the inclined portion, the plate thickness may be gradually reduced from the end portion on the main body portion 110 side (front side) toward the end portion on the second connection portion 130 side (rear side). According to this, the plate thickness of the rear end portion of the inclined portion is thinnest, and the rear end portion of the inclined portion constitutes the fragile portion. Alternatively, in the inclined portion of the present invention, a fragile portion may be formed by providing a recess on the outer peripheral surface or the inner peripheral surface and changing the plate thickness of a partial section.
　１，３１，４１　マンドレル
　２　　　胴部
　４　　　円柱部
　４ａ，３４ａ　他端部（両端部）
　５，３５　縮径部（両端部）
　６，３６　小径部（両端部）
　７　　　第一金属材料（第一材料）
　８　　　第二金属材料（第二材料）
　９　　　膨張部（中央部）
　３２　　胴部
　３４　　円筒部
　３９　　肉厚部（中央部）
　５０　　外型
　１０１　動力伝達軸
　１０２　管体
　１１０　本体部
　１２０　第一接続部
　１３０　第二接続部
　１４０　傾斜部 1, 31, 41 Mandrel 2 Body part 4 Cylindrical part 4a, 34a Other end part (both ends)
5,35 Reduced diameter part (both ends)
6,36 Small diameter part (both ends)
7 First metal material (first material)
8 Second metal material (second material)
9 Expansion part (central part)
32 body part 34 cylindrical part 39 thick part (central part)
50 Outer type 101 Power transmission shaft 102 Tubular body 110 Main body part 120 First connection part 130 Second connection part 140 Inclined part

Claims (6)

  1. 　繊維強化プラスチック製であって動力伝達軸に用いられる管体の製造に用いられるマンドレルであって、
    　樹脂を含浸した連続繊維が巻き付けられる胴部を備え、
    　前記胴部は、加熱により膨張する材料により形成され、
    　前記胴部は、両端部よりも中央部の方が加熱時の膨張量が大きいことを特徴とするマンドレル。     A mandrel used for manufacturing a tubular body made of fiber reinforced plastic and used for a power transmission shaft,
    Equipped with a body around which continuous fibers impregnated with resin are wound,
    The body is formed of a material that expands when heated,
    The mandrel of the present invention is characterized in that the central portion of the body has a larger expansion amount when heated than at both ends.
  2. 　前記胴部の中央部には、膨張部が設けられ
    　前記膨張部は、前記胴部の端部を形成する第一材料よりも熱膨張率が高い第二材料により形成されていることを特徴とする請求項１に記載のマンドレル。     An expansion part is provided in the central part of the body part, and the expansion part is formed of a second material having a higher thermal expansion coefficient than the first material forming the end part of the body part. The mandrel according to claim 1.
  3. 　前記膨張部の厚みは、軸線方向の中央部に向うに連れて厚く形成され、
    　前記膨張部を軸線方向に切った断面形状は、中央部が径方向内側に突出するように弓形となっていることを特徴とする請求項２に記載のマンドレル。     The thickness of the expanded portion is formed thicker toward the central portion in the axial direction,
    The mandrel according to claim 2, wherein a cross-sectional shape obtained by cutting the inflated portion in the axial direction is arcuate so that a central portion thereof projects radially inward.
  4. 　前記胴部は、筒状となっているとともに全体が同一材料で形成され、
    　前記胴部の中央部には、前記胴部の端部の厚みよりも厚い肉厚部が設けられていることを特徴とする請求項１に記載のマンドレル。     The body has a tubular shape and is entirely made of the same material,
    The mandrel according to claim 1, wherein a thick portion that is thicker than a thickness of an end portion of the body portion is provided in a central portion of the body portion.
  5. 　前記肉厚部の厚みは、軸線方向の中央部に向うに連れて厚く形成され、
    　前記肉厚部の内周面を軸線方向に切った断面形状は、中央部が径方向内側に突出するように曲線状となっていることを特徴とする請求項４に記載のマンドレル。     The thickness of the thick portion is formed thicker toward the central portion in the axial direction,
    The mandrel according to claim 4, wherein a cross-sectional shape obtained by cutting the inner peripheral surface of the thick portion in the axial direction is curved so that the central portion projects inward in the radial direction.
  6. 　前記胴部の端部の外周形状は、多角形状となっていることを特徴とする請求項１から請求項５のいずれか１項に記載のマンドレル。 The mandrel according to any one of claims 1 to 5, wherein the outer peripheral shape of the end of the body is polygonal.
PCT/JP2019/010039 2019-02-27 2019-03-12 Mandrel WO2020174694A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49109468A (en) * 1973-02-21 1974-10-17
JPH074878B2 (en) * 1989-02-20 1995-01-25 横浜ゴム株式会社 Manufacturing method of fiber reinforced thermoplastic resin hollow body
JPH0788968A (en) * 1993-09-21 1995-04-04 Isuzu Motors Ltd Forming method of frp hollow body
JP2000108210A (en) * 1998-10-02 2000-04-18 Toyota Autom Loom Works Ltd Manufacture of frp cylindrical component, and core
JP2004184658A (en) * 2002-12-03 2004-07-02 Nascon Kk Display device and display system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004181658A (en) * 2002-11-29 2004-07-02 Japan Aircraft Mfg Co Ltd Method and apparatus for manufacturing branched part of tube made of fiber-reinforced resin

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49109468A (en) * 1973-02-21 1974-10-17
JPH074878B2 (en) * 1989-02-20 1995-01-25 横浜ゴム株式会社 Manufacturing method of fiber reinforced thermoplastic resin hollow body
JPH0788968A (en) * 1993-09-21 1995-04-04 Isuzu Motors Ltd Forming method of frp hollow body
JP2000108210A (en) * 1998-10-02 2000-04-18 Toyota Autom Loom Works Ltd Manufacture of frp cylindrical component, and core
JP2004184658A (en) * 2002-12-03 2004-07-02 Nascon Kk Display device and display system

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