WO2005118256A1 - Procédé de production de carter de joint et dispositif de chauffage utilisant ce procédé - Google Patents

Procédé de production de carter de joint et dispositif de chauffage utilisant ce procédé Download PDF

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Publication number
WO2005118256A1
WO2005118256A1 PCT/JP2004/015795 JP2004015795W WO2005118256A1 WO 2005118256 A1 WO2005118256 A1 WO 2005118256A1 JP 2004015795 W JP2004015795 W JP 2004015795W WO 2005118256 A1 WO2005118256 A1 WO 2005118256A1
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WO
WIPO (PCT)
Prior art keywords
wall
support
diameter
parison
joint boot
Prior art date
Application number
PCT/JP2004/015795
Other languages
English (en)
Japanese (ja)
Inventor
Katsushi Saito
Takenori Ohshita
Eiichi Imazu
Original Assignee
Toyo Tire & Rubber Co., Ltd.
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 Toyo Tire & Rubber Co., Ltd. filed Critical Toyo Tire & Rubber Co., Ltd.
Priority to JP2006514050A priority Critical patent/JP3876366B2/ja
Priority to PCT/JP2005/004826 priority patent/WO2005118257A1/fr
Priority to JP2005078245A priority patent/JP3844001B2/ja
Priority to JP2005078240A priority patent/JP3844000B2/ja
Priority to PCT/JP2005/004827 priority patent/WO2005118258A1/fr
Publication of WO2005118256A1 publication Critical patent/WO2005118256A1/fr

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Classifications

    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
    • B29C49/6445—Thermal conditioning of preforms characterised by temperature differential through the preform length
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/84—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor
    • F16D3/843—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers
    • F16D3/845—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers allowing relative movement of joint parts due to the flexing of the cover
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/04—Bellows
    • F16J3/041—Non-metallic bellows
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/703—Bellows
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/202—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints
    • F16D3/205—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part
    • F16D3/2055—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members one coupling part having radially projecting pins, e.g. tripod joints the pins extending radially outwardly from the coupling part having three pins, i.e. true tripod joints

Definitions

  • the present invention relates to a cylindrical large-diameter mounting portion, in which a plurality of convex portions projecting from an inner peripheral portion are fitted into a concave portion of an outer case, and a small-diameter mounting portion, which is mounted on a shaft.
  • the present invention also relates to a method for manufacturing a joint boot for manufacturing a joint boot including a bellows portion connecting these components, and a heating device used for the method.
  • this constant velocity joint As one of constant velocity joints provided on a drive shaft or the like of an automobile, there is a tripod constant velocity joint capable of changing the position in the axial direction and transmitting a rotational force. As shown in FIGS. 10 and 11, this constant velocity joint has three traverses 31 with rollers protruding from a shaft 3 on an input side (or an output side) in a direction perpendicular to the axis.
  • the outer case 1 is provided at the end of the shaft 40 (or the input side), and three grooves 34 on which the rollers 32 roll are distributed and arranged in the circumferential direction on the inner periphery of the outer case 1.
  • . 33 is a tripod.
  • the joint boots described at the beginning are provided for such a constant velocity joint, prevent dust and foreign matter from entering the constant velocity joint side, and hold a dolly around the constant velocity joint.
  • a plurality of convex portions 7 projecting radially inward are provided on the inner peripheral portion of the large-diameter-side mounting portion 2 of the joint boot in a dispersed manner in the circumferential direction.
  • the outer peripheral surface of the large-diameter side mounting portion 2 is formed in a circular cross section for fastening by the ring-shaped band 9.
  • resin joint boots are generally manufactured by molding a small-diameter side mounting portion by injection molding, and then blow-molding the other bellows portion and a large-diameter side mounting portion (for example, Patent Document 1). It is necessary to form the large-diameter-side mounting portion 2 as described above into an irregular shape in which the outer peripheral surface has a perfect circular shape and the inner peripheral surface has an uneven shape having convex portions at a plurality of circumferential positions. Some joint boots cannot be manufactured by such general injection blow molding. This is because the thickness in the circumferential direction is uniform or almost This is because such irregular shapes cannot be formed by blow-molding the large-diameter-side mounting portion in order to achieve uniformity.
  • Patent Document 2 a drawer having a cavity for forming a small-diameter-side mounting portion is brought into contact with an outlet gap of a nozzle base, and an outlet gap force injects molten resin into the cavity. After forming the small diameter side mounting part, the drawing device is separated while extruding the molten resin through the outlet gap to form a cylindrical nozzle, and then the top of the nozzle die is replaced with a blow mold. There has been proposed a method for manufacturing the above-mentioned tripod-type joint by forming a bellows portion by blow molding and by injection-molding a large-diameter-side mounting portion with a lower nozzle base.
  • Patent Literature 2 uses a method for injection-molding a large-diameter-side mounting portion, which is the most dimensional and requires the highest dimensional accuracy and is difficult to mold. It is used as a flow path for molten resin during injection molding of the cavitica and the small diameter side mounting portion and during extrusion of the parison. For this reason, it is necessary to maintain the temperature at a high temperature when using the cavity portion as a flow path for the molten resin, and to cool it during injection molding, which complicates the temperature control and makes it difficult to ensure high and dimensional accuracy. U, there is a problem.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 6-234150
  • Patent Document 2 Japanese Patent Application Publication No. 2002-361715
  • the present invention has been made in view of the above points, and is capable of accurately manufacturing a joint boot having a large-diameter-side mounting portion having an outer peripheral surface and an inner peripheral surface having different shapes. It is an object of the present invention to provide a production method of the above, and a heating device used for the method.
  • the method of the present invention is characterized in that a plurality of convex portions projecting from the inner peripheral portion are fitted into the concave portion of the outer case and are mounted on the cylindrical large-diameter side mounting portion, and the small-diameter side mounting portion is mounted on the shaft. And a bellows part for connecting these, and comprising the following steps.
  • the large-diameter side mounting portion and the small-diameter side mounting portion are formed into a final product shape with high dimensional accuracy at the time of parison molding, and the bellows portion is subjected to subsequent blow molding. Since the final product shape can be formed, even if the large-diameter side mounting portion and the small-diameter side mounting portion have different shapes, the molding can be performed with high accuracy.
  • the third portion for forming the bellows portion is heated to the set temperature by the heating device, and then the third portion is blow-molded. Variations in the temperature distribution of the three parts can be generated.
  • blow molding without such heating causes high temperature.
  • the part swells well, and the part with low temperature becomes swelling, which makes it difficult to form the bellows part uniformly.
  • the temperature distribution of the third portion can be made less likely to occur due to the heating, the third portion can be uniformly expanded when the third portion is blow-molded. Therefore, the thickness of the bellows can be formed uniformly.
  • the protruding portion may have an inner wall portion that protrudes radially inwardly in a curved shape, and an arc-shaped outer wall that forms a part of an outer peripheral surface of a large-diameter-side mounting portion.
  • a radially extending central support wall connecting the inner wall portion and the outer wall portion at the center in the circumferential direction of the inner wall portion, and connecting the inner wall portion and the outer wall portion at both sides of the central support wall.
  • Left and right side support walls may be provided, and the side support walls may be inclined so that the outer side is closer to the central support wall.
  • the convex portion is provided with a cavity as a lightening hole between the center support wall and the side support wall and on both sides of the side support wall. Therefore, the convex portion is formed by a solid thick portion. As compared with the case where the molding material is used, the molding material can be cooled quickly, and the occurrence of sink marks due to shrinkage after molding can be prevented.
  • the side support wall is provided so as to be inclined outwardly closer to the center support wall, the following effects are exerted.
  • the thickness of the lightening hole outside the side support wall becomes smaller, which makes it difficult to remove the core.
  • the cross-sectional area of the lightening hole outside the side support wall can be secured, and the core can be easily removed.
  • the side support wall supporting the outer side surface of the inner wall portion can be connected to the inner wall portion at an angle close to vertical. Therefore, when the large-diameter-side mounting portion is fastened and fixed, the surface pressure exerted on the outer case by the inner wall portion can be made uniform in the circumferential direction, and the sealing performance at the convex portion can be improved. From this point of view, it is preferable that the side support wall is connected substantially perpendicularly to the inner wall portion, and more particularly, the angle of the side support wall to the inner wall portion is 70 ° — 110 °. It is preferable that it is within the range.
  • the side support wall is connected to the inner wall portion at an intermediate position between a connection portion of the inner wall portion to the central support wall and a root portion to the outer wall portion, and It is preferable that The weakest and weakest portions on both sides of the connecting portion between the inner wall portion and the central support wall are located at an intermediate point between the connecting portion and the base portion to the outer wall portion. If the wall is reinforced so as to be supported by the side support walls, it is more effective for the inner wall to uniform the surface pressure on the outer case.
  • the first portion is coaxially fitted to the lower fitting portion of the support, and the second portion is coaxial to the upper fitting portion of the support.
  • the parison is supported by the support so that the third portion surrounds the upper and lower intermediate portions of the support concentrically at an interval, and the support is supported by the support.
  • the third portion may be heated radially outward while being rotated about the axis of the third portion.
  • the third portion since the third portion is heated from the radially outward side while rotating the support around the axis of the support, the third portion can be uniformly heated. Since the third part surrounds the upper and lower middle part of the support concentrically with a space between them, It is possible to prevent a problem that a temperature difference occurs between the inner peripheral surface side and the outer peripheral surface side of the third portion, where the inner peripheral portion of the third portion is not cooled by the support. Therefore, it is possible to make the temperature distribution of the third portion less likely to vary.
  • the cover member may be a cylindrical cover member that concentrically surrounds the parison from the first portion to the second portion, wherein the cover member covers the third portion.
  • a cover member having an opening for heating may be placed on the parison to heat the third portion.
  • the third portion is heated through the opening provided in the cover member, but the first portion and the second portion are covered by the cover member and thus are heated by the heating device. Peg. Therefore, deformation of the large-diameter side mounting portion and the small-diameter side mounting portion due to the heating of the first portion and the second portion can be suppressed.
  • the parison is covered with the outer mold while being supported by the support, and provided on the support.
  • the above-mentioned gas may be injected from the injection port.
  • a heating device is a heating device used in the above-described method for manufacturing a joint boot according to the present invention, wherein a plurality of the support members are arranged on a lower conveyor at intervals in a transport direction.
  • a rotation drive mechanism for rotating the support around the axis is provided between each support and the lower conveyor, and a plurality of the force bar members are provided on the upper conveyor facing the lower conveyor, in the transport direction.
  • a lifting mechanism for raising and lowering the cover member is provided between each cover member and the upper conveyor, and heaters are provided on both lateral outer sides between the lower conveyor and the upper conveyor. It has been arranged.
  • the first part is coaxially externally fitted to the lower fitting part of the support
  • the second part is coaxially externally fitted to the upper fitting part of the support
  • the third part is a part of the support.
  • the noson is supported by a support so that the upper and lower middle parts are concentrically surrounded by a space.
  • the cover suspended and supported by the upper conveyor The member is lowered by driving the elevating mechanism to cover the parison.
  • the third portion is connected to the lower and upper conveyors through the opening provided in the cover member. Heat with heaters on both sides outside between
  • the plurality of parisons are sequentially supported by the plurality of supports, and the third portion of each parison is heated.
  • the third portions of the plurality of parisons can be heated continuously, and the efficiency of the heating operation can be increased.
  • a joint boot having a large-diameter side mounting portion in which the outer peripheral surface and the inner peripheral surface have different shapes can be manufactured with high accuracy, and the bellows portion is formed. Since only the third portion is heated to the set temperature by the heating device and then the third portion is blow-molded, the thickness of the bellows portion can be formed uniformly.
  • Figures 10 and 11 show a triple-port type constant velocity joint for automobiles
  • Figures 4 and 5 show joint boots made of thermoplastic elastomer resin for the constant velocity joint.
  • the joint boot includes a cylindrical large-diameter side mounting portion 2 fitted externally to the outer case 1, a cylindrical small-diameter side mounting portion 4 mounted on the shaft 3, and a bellows portion 5 connecting these.
  • the outer peripheral surface 2a of the large-diameter mounting portion 2 is formed in a circular cross-section, and the three protruding radially inward portions are formed on the inner peripheral portion 2b of the large-diameter mounting portion 2.
  • Protrusions 7 are evenly distributed in the circumferential direction at every 120 degrees, and three protrusions 7 can be separately fitted to three recesses 8 formed on the outer periphery of the outer case 1. It is.
  • the convex portion 7 includes an inner wall portion 71 that protrudes inward in the radial direction, and an arc-shaped outer wall portion 72 that forms a part of the outer peripheral surface 2a of the large-diameter mounting portion 2, These inner wall 71 and outer wall 7 A central support wall 73 connecting the two walls 71, 72 at the center in the circumferential direction, and a pair of left and right side support walls 74, 72 connecting the two walls 71, 72 on the left and right sides of the cavity between the two. 74 and force S are provided.
  • the outer wall 72 is an arc-shaped wall having a substantially constant wall thickness in the circumferential direction, and is integrated with the arc-shaped wall 76 interposed between the projections 7 to form a single cylindrical body. It is configured to make!
  • the inner wall portion 71 is a wall portion having a substantially constant thickness and formed in a curved shape so as to project radially inward from the inner peripheral surface of the cylindrical body.
  • the central support wall 73 is a wall portion extending in the radial direction that supports the inner wall portion 71 with respect to the outer wall portion 72, and the height of the inner wall portion 71 protruding inward. It is provided at the center in the circumferential direction where the maximum height is obtained.
  • the side support wall 74 is a wall that supports the inner wall 71 to the outer wall 72, and is parallel to the central support wall 73 provided radially from the center of the large-diameter mounting portion 2. It is formed to be inclined so that the outermost part becomes closer to the central support wall 73. More specifically, the side support wall 74 is formed so that the inner wall 71 is supported by the center support wall 73 and the side support walls 74, 74 at equal intervals in the circumferential direction. The inner wall portion 71 is supported at an intermediate position between the base portion 71a and the connecting portion 71b between the central support wall, that is, the inner wall portion 71 is connected at the intermediate position.
  • connection angle ⁇ of the side support wall 74 with respect to the inner wall portion 71 is substantially vertical. More specifically, the connection angle 0 is in a range of 70 ° to 110 ° (ie, 90 ° ⁇ 20 °). It is preferably within the range of 80 ° -100 °.
  • the coupling angle ⁇ is an angle formed by the center line N of the side support wall 74 and the tangent line Q on the inner peripheral surface of the inner wall portion 71 intersecting the center line N.
  • the convex portion 7 is provided with a lightening hole 75 that is a plurality of hollow portions arranged in the circumferential direction.
  • the convex portion 7 is formed with two pairs of bottomed lightening holes 75a, 75b, 75c, 75d that are open to the end face of the large-diameter mounting portion 2 and that are symmetrical with respect to the circumferential center line L.
  • the depth of each of the lightening holes 75a-75d is set to be the same.
  • the pair of inner lightening holes 75b and 75c partitioned by the central support wall 73 has a trapezoidal cross-sectional shape in which the outer peripheral surface 2a side of the large-diameter mounting portion 2 is narrowed.
  • the lightening holes 75a and 75d have a triangular cross section having a vertex angle directed inward in the radial direction.
  • a fixing member extending in the circumferential direction for receiving a ring-shaped band 9 (see FIG. 10) serving as a fastening member is provided on the outer peripheral surface 2a of the large-diameter side mounting portion 2.
  • a recess 60 is provided.
  • two ribs 61 extending in the circumferential direction are provided on the inner peripheral surface of the large-diameter-side mounting portion 2.
  • the small diameter side mounting portion 4 is also provided on its outer peripheral surface with a fixing concave portion 62 extending in the circumferential direction for receiving the ring-shaped band 9 serving as a tightening member. Is provided with two ribs 63 extending in the circumferential direction.
  • the joint boot is manufactured through the following Norrison molding step, heating step, and blow molding step.
  • the molding material is discharged from a nozzle 11 of the parison molding apparatus A, and a first portion 12 corresponding to the large-diameter mounting portion 2, a second portion 13 corresponding to the small-diameter mounting portion 4, A cylindrical parison 15 including a third portion 14 corresponding to the bellows portion 5 is injection-molded.
  • the first portion 12 is molded as the large-diameter mounting portion 2 in the cavity of the molding device A, that is, is injection-molded into the final product shape of the large-diameter mounting portion 2. . Therefore, the first portion 12 is formed into a shape in which the outer peripheral surface has a circular cross section and has a plurality of the convex portions 7 on the inner peripheral portion. 75d is molded.
  • the fixing recess 60 is formed on the outer peripheral surface, and two ribs 61 are formed on the inner peripheral surface.
  • the second portion 13 is molded as the small-diameter side mounting portion 4 in the cavity of the molding apparatus A, that is, is injection-molded into the final product shape of the small-diameter side mounting portion 4.
  • the second part 13 is formed into a cylindrical shape having a smaller diameter than the first part 12, and the fixing recesses 62 1S are formed on the outer peripheral surface thereof and two ribs 63 are formed on the inner peripheral surface thereof.
  • the opening surface at the upper end of the second portion 13 is closed after injection molding, and the closed portion 13a is cut off after blow molding in the present embodiment.
  • the third part 14 is a parison part interposed between the first part 12 and the second part 13 which does not have a bellows shape corresponding to the final product shape, and connects the two. Tapered cylinder Injection molding. That is, the third portion 14 is formed in a tapered shape in which the diameter is gradually reduced from the large-diameter mounting portion 2 to the small-diameter mounting portion 4.
  • the heating device B is configured as follows so as to continuously heat a plurality of Norrisons 15.
  • a plurality of stepped cylindrical supports 16 for the parison 15 are arranged on the lower conveyor 17 at regular intervals in the transport direction, and A rotation drive mechanism M for rotating the support 16 around the axis O of the support 16 is provided between each support 16 and the lower conveyor 17.
  • the support 16 has a lower support portion 19 at the lower end, a lower fitting portion 20 having a diameter smaller than that of the lower portion 20 for concentrically fitting the first portion 12, and a third portion 14 with an interval.
  • a plurality of tubular cover members 24 are suspended from the upper conveyor 23 opposed to the lower conveyor 17 at fixed intervals in the conveyance direction, and are supported by the cover members 24 and the upper conveyor 23.
  • a cylinder 25 (equivalent to an elevating mechanism) that raises and lowers the cover member 24 is provided between the lower conveyor 17 and the upper conveyor 23.
  • a pair of long far-infrared heaters 53 It is arranged.
  • the cover member 24 has a cylindrical shape that concentrically surrounds the parison 15 held on the support 16 over the entire height thereof, that is, from the first portion 12 to the second portion 13. I do. Specifically, a large-diameter cylindrical portion 24a surrounding the outer periphery of the first portion 12 and a small-diameter cylindrical portion 24b surrounding the outer periphery of the second portion 13 and the third portion 14 are connected via a step portion 24c. It has a stepped cylindrical shape and has a top plate 24d that closes the upper end.
  • the cover member 24 is provided in non-contact with any part of the Norrison 15, thereby preventing a contact mark during heating from being left on the surface of the Norrison 15!
  • the cover member 24 has a heating opening 27 at a position covering the third portion 14.
  • the opening 27 is connected to a pair of heaters 53, 53 provided on both lateral outer sides of the conveyors 17, 23.
  • the cover member 24 is provided at two locations diametrically opposed to each other so as to face each other.
  • the height of the opening 27 is such that the lower end 27a is set at the boundary between the first part 12 and the third part 14 and the upper end 27b is set so that the heat rays of the heater power, that is, far infrared rays are emitted only to the third part 14. Is set at the boundary between the second part 13 and the third part 14.
  • the plurality of parisons 15 are sequentially supported by the plurality of supports 16, and the third portion 14 of each parison 15 is heated. This heats the third part 14 of the plurality of parisons 15 continuously.
  • the parison 15 is covered with the outer mold 51 having a bellows shape while the parison 15 is supported by the support 16, and the injection port ( Gas is injected from the not shown) to the inner peripheral surface of the third part 14, and the third part 14 is pressed against the outer mold 51 to form the bellows part 5.
  • the parison 1 No gas seal is required at the upper end of 5, and only the first portion 12 at the lower end needs to be sealed.
  • the seal at the first portion 12 is, for example, such that when the Norrison 15 is attached to the support 16, the inner peripheral surface 12 a of the first portion 12 is fitted in close contact with the outer peripheral surface of the lower fitting portion 20.
  • the support 16 supporting the Norrison 15 may be closed with a left-right split outer die 51 so as to cover the lateral force, and then the support 16 may be shifted upward to form the first portion.
  • the opening end surface 12b of 12 may be pressed against the upper surface of the support base 19!
  • the joint boot is obtained by cutting off the closed portion 13a of the upper end opening surface of the second portion 13.
  • the large-diameter side mounting portion 2 and the small-diameter side mounting portion 4 are formed into a final product shape with high dimensional accuracy by injection molding during parison molding, and the bellows portion is formed. 5 is formed into the final product shape by subsequent blow molding, so it is possible to accurately mold not only the small-diameter mounting part 4 but also the large-diameter mounting part 2 whose inner peripheral part is significantly different from the outer peripheral part. can do.
  • the third portion 14 for forming the bellows portion 5 is heated to the set temperature by the heating device B, and thereafter, the third portion 14 is blow-molded. Therefore, the third portion 14 can be uniformly expanded when blow-molded, so that the thickness of the bellows portion 5 can be formed uniformly.
  • the large-diameter side mounting portion 2 can be accurately formed into a desired shape, and the large-diameter side mounting portion 2 can be immediately attached to the outer case. Can improve the adhesion. Furthermore, since the side support wall 74 is provided so as to be inclined outward toward the central support wall 73, the cross-sectional area of the outer lightening holes 75a and 75d is ensured, and the core is easily removed from the mold. Can be secured.
  • the side support wall 74 can be joined at an angle close to perpendicular to the inner wall 71, the inner wall 71 exerts an influence on the outer case when the large-diameter side mounting portion 2 is tightened and fixed.
  • the surface pressure can be made uniform in the circumferential direction, and the sealing performance at the projection 7 can be improved.
  • the present invention can be suitably used for manufacturing a joint boot used for a constant velocity joint of an automobile or the like.
  • FIG. 1 Diagram showing a parison molding process
  • FIG. 6 is a cross-sectional view of a convex portion on a large-diameter side mounting portion of a joint boot.
  • FIG. 7 is a diagram showing a heating device and a heating process.
  • FIG. 8 is a plan view showing a lower conveyor and the like with a parison attached.
  • FIG. 10 is a longitudinal sectional view showing a constant velocity joint and a joint boot.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

Un procédé de production de carter de joint de façon à mouler une partie de soufflet d'épaisseur uniforme, comprenant les étapes de formation d'une paraison cylindrique (15) à partir du matériau de moulage, la paraison comprenant une première partie (12) correspondant à une plus grande partie d'attache (2) du côté du diamètre, une deuxième partie (13) correspondant à une plus petite partie d'attache (4) du côté du diamètre, et une troisième partie (14) reliant les deux parties (12, 13), de chauffage d’uniquement la troisième partie (14) des première, deuxième, et troisième parties à une température donnée par un dispositif de chauffage (B), de recouvrement par la suite de la troisième partie avec un moule externe (51), de soufflage du gaz vers la surface périphérique interne de la troisième partie, et de pressage de la troisième partie contre le moule externe pour mouler une partie de soufflet (5).
PCT/JP2004/015795 2004-06-03 2004-10-25 Procédé de production de carter de joint et dispositif de chauffage utilisant ce procédé WO2005118256A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2006514050A JP3876366B2 (ja) 2004-06-03 2004-10-25 ジョイントブーツの製造方法及びこの方法に用いる加熱装置
PCT/JP2005/004826 WO2005118257A1 (fr) 2004-06-03 2005-03-17 Procede de fabrication de soufflet de protection d’articulation
JP2005078245A JP3844001B2 (ja) 2004-06-03 2005-03-17 ジョイントブーツの製造方法
JP2005078240A JP3844000B2 (ja) 2004-06-03 2005-03-17 ジョイントブーツの製造方法
PCT/JP2005/004827 WO2005118258A1 (fr) 2004-06-03 2005-03-17 Procede de fabrication de soufflet de protection d’articulation

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01250673A (ja) * 1988-03-31 1989-10-05 Kinugawa Rubber Ind Co Ltd ダストブーツ及びその製造方法
EP0915264A2 (fr) * 1997-11-04 1999-05-12 Draftex Industries Limited Soufflet de protection
JP2003222155A (ja) * 2002-01-29 2003-08-08 Toyoda Gosei Co Ltd 等速ジョイント用ブーツ
JP2003329057A (ja) * 2002-05-14 2003-11-19 Toyo Tire & Rubber Co Ltd 樹脂製ジョイントブーツ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01250673A (ja) * 1988-03-31 1989-10-05 Kinugawa Rubber Ind Co Ltd ダストブーツ及びその製造方法
EP0915264A2 (fr) * 1997-11-04 1999-05-12 Draftex Industries Limited Soufflet de protection
JP2003222155A (ja) * 2002-01-29 2003-08-08 Toyoda Gosei Co Ltd 等速ジョイント用ブーツ
JP2003329057A (ja) * 2002-05-14 2003-11-19 Toyo Tire & Rubber Co Ltd 樹脂製ジョイントブーツ

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