WO2005118258A1 - Procede de fabrication de soufflet de protection d’articulation - Google Patents

Procede de fabrication de soufflet de protection d’articulation Download PDF

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Publication number
WO2005118258A1
WO2005118258A1 PCT/JP2005/004827 JP2005004827W WO2005118258A1 WO 2005118258 A1 WO2005118258 A1 WO 2005118258A1 JP 2005004827 W JP2005004827 W JP 2005004827W WO 2005118258 A1 WO2005118258 A1 WO 2005118258A1
Authority
WO
WIPO (PCT)
Prior art keywords
wall
support
parison
diameter
mounting portion
Prior art date
Application number
PCT/JP2005/004827
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
Priority claimed from PCT/JP2004/015795 external-priority patent/WO2005118256A1/fr
Application filed by Toyo Tire & Rubber Co., Ltd. filed Critical Toyo Tire & Rubber Co., Ltd.
Publication of WO2005118258A1 publication Critical patent/WO2005118258A1/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
    • B29C49/02—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
    • 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
    • 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
    • B29C49/66—Cooling by refrigerant introduced into the blown article
    • 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
    • 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
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • 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

Definitions

  • the present invention relates to a method for manufacturing a joint boot for manufacturing a joint boot including a large-diameter mounting portion mounted on an outer case, a small-diameter mounting portion mounted on a shaft, and a bellows connecting these components. .
  • 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, in blow molding, the thickness in the circumferential direction is uniform or almost uniform. Because you can't.
  • 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.
  • a method has been proposed in which a bellows portion is formed by blow molding, and a large-diameter-side mounting portion is injection-molded by a lower nozzle base to produce the above-described tripod-type joint boot.
  • 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 3 discloses that a parison having a large-diameter side mounting portion, a small-diameter side mounting portion, and a hollow blow portion corresponding to a bellows portion is injection-molded, and after cooling, the molded parison is injected. It describes a method in which a bellows portion is formed by taking out a mold together with a core mold, attaching the core to a blow mold, and blowing air from the core mold into a blow portion.
  • the document does not disclose how to heat Noson during blow molding. If the tip is heated as a whole, it may be deformed due to the heating of the large-diameter mounting part and the small-diameter mounting part formed precisely by injection molding.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 6-234150
  • Patent Document 2 Japanese Patent Application Publication No. 2002-361715
  • Patent Document 3 Japanese Patent Laid-Open No. 2003-222155
  • the present invention has been made in view of the above points, and the outer peripheral surface and the inner peripheral surface have different shapes. It is an object of the present invention to provide a method for manufacturing a joint that can be manufactured with high accuracy even if the joint boot has a large-diameter side mounting portion.
  • the method of the present invention provides a method of manufacturing a joint boot comprising a cylindrical large-diameter mounting portion mounted on an outer case, a cylindrical small-diameter mounting portion mounted on a shaft, and a bellows portion connecting these.
  • the method comprises the following steps.
  • a first portion forming the product shape of the large-diameter side mounting portion, a second portion forming the product shape of the small-diameter side mounting portion, and a second portion connecting the first portion and the second portion.
  • the parison After cooling the parison, heating only the third part of the first part, the second part, and the third part to a set temperature by a heating device, wherein the first part is supported.
  • the second part is coaxially fitted to the lower fitting part of the body, the second part is fitted coaxially to the upper fitting part of the support, and the third part is a space between the upper and lower middle parts of the support.
  • the parison is supported by the support so as to be in a state of being concentrically surrounded by a gap, and only the third portion is heated by a heating device from a radially outer side.
  • the large-diameter side mounting portion and the small-diameter side mounting portion are formed into a final product shape with high dimensional accuracy during parison molding, and the bellows portion is formed by subsequent blow molding. Since it is possible to form the final product shape, even if the large-diameter side mounting portion and the small-diameter side mounting portion have different shapes, they can be formed with high accuracy.
  • the present invention provides a tripod-type joint boot in which the large-diameter-side mounting portion has a plurality of protrusions fitted to a plurality of recesses of the outer case protruding from an inner peripheral portion. Also, the large-diameter-side mounting portion can be formed with high precision, and thus, leakage of the seal can be avoided even for the tripod-type large-diameter-side mounting portion which has conventionally been difficult to secure the sealing performance.
  • the third portion concentrically surrounds the upper and lower middle portions of the support with a space therebetween, so that the inner peripheral portion of the third portion is supported by the support. This prevents a temperature difference between the inner peripheral surface side and the outer peripheral surface side of the third portion that is not cooled down. Therefore, the temperature distribution in the third portion can be more likely to vary.
  • the protruding portion includes 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 the 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 molding material can be cooled faster than in the case where the convex portion is formed of a solid thick portion, and the occurrence of sink caused by 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. That is, when the side support wall is arranged parallel to the center support wall, the thickness of the hole outside the side support wall becomes small, and it becomes difficult to remove the core. By inclining to the center support wall side, the cross-sectional area of the lightening hole outside the side support wall can be secured, and the core can be easily removed. [0018] Furthermore, by sloping the side support wall as described above, the side support wall supporting the outer side surface of the inner wall portion can be joined to the inner wall portion at an angle close to perpendicular.
  • the side support wall is connected substantially perpendicularly to the inner wall part, and more particularly, the angle of the side support wall with respect to the inner wall part is 70 ° — 110 °. It is preferable that it is within the range.
  • the side support wall is coupled to the inner wall portion at a position intermediate between a connection portion of the inner wall portion to the central support wall and a root portion to the outer wall portion. 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 support supporting the parison is rotated around an axis of the support, and a pair of support members provided on both sides of the support with the support interposed therebetween.
  • the third portion may be heated from the radially outer side by the heater. According to this means, the third portion is heated radially outward while rotating the support around the axis of the support, so that the third portion can be uniformly heated.
  • the manufacturing method of the present invention further includes a cylindrical first cover portion surrounding the outer periphery of the first portion, and a cylindrical second cover portion surrounding the outer periphery of the second portion,
  • the first cover portion and the second cover portion are connected by a connecting portion, and a cover member provided with a heating opening at a location corresponding to the third portion is put on the parison, and the third cover portion is covered with the third cover portion. It is preferred to do heating of the part.
  • 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.
  • a plurality of the supports are provided on the lower conveyor in the conveying direction. And a rotation drive mechanism for rotating the support around the axis is provided between each support and the lower conveyor, and the upper conveyor opposed to the lower conveyor is provided with a rotary drive mechanism.
  • a plurality of cover members are suspended and supported at intervals in the transport direction, and an elevating mechanism for elevating and lowering the cover members is provided between each cover member and the upper conveyor.
  • the above-mentioned heating can be performed using a heating device in which a heater is arranged on both lateral outer sides between the two.
  • the parison is sequentially supported by the plurality of supports, the cover member is lowered by the elevating mechanism to cover each parison, and the upper conveyor and the lower conveyor are transported and driven.
  • the third part of each parison is sequentially heated by the heater while the body is being rotated by the rotary drive mechanism. As described above, since the third portions of the plurality of parisons can be heated continuously, the efficiency of the heating operation can be increased.
  • 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 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 precision, 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.
  • the third portion surrounds the upper and lower intermediate portions of the support concentrically at intervals, so that the inner peripheral portion of the third portion is cooled by the support. 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 that is closed. Therefore, it is possible to make the temperature distribution of the third portion less likely to vary.
  • Figure 10 Figure Fig. 11 shows a tripod type constant velocity joint of an automobile
  • Figs. 4 and 5 show joint boots made of thermoplastic elastomer resin for the constant velocity joint.
  • three traverses 31 with rollers are provided on the input shaft 3 in a direction perpendicular to the axis, and an outer case 1 is provided at an end of the output shaft 40.
  • an outer case 1 is provided at an end of the output shaft 40.
  • three grooves 34 on which the roller 32 rolls are distributed and arranged in the circumferential direction. 33 is the tripod.
  • the joint boot includes a cylindrical large-diameter mounting portion 2 fitted externally to the outer case 1, a cylindrical small-diameter 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.
  • a central support wall 73 connecting the two walls 71, 72 at the center in the circumferential direction, and both walls 71, 72 on both left and right sides thereof.
  • a pair of left and right side support walls 74, 74 to be connected and a force S are provided.
  • the outer wall portion 72 is an arc-shaped wall portion having a substantially constant wall thickness in the circumferential direction, and is integrated with the arc-shaped wall portion 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 a central support wall 73 that is 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 such that the inner side wall portion 71 and the center support wall 73 are equally spaced in the circumferential direction.
  • the inner wall portion 71 is supported at an intermediate position between the root portion 71a of the inner wall portion 71 to the outer wall portion and the connecting portion 71b with the central support wall so as to be supported by the support walls 74, 74, That is, it is connected to the inner wall 71 at the intermediate position.
  • the connecting portion is provided so as to intersect approximately perpendicularly with the inner wall portion 71, so as to go outward from the connecting portion toward the center, that is, to be inclined so as to approach the central support wall 73. Te ru.
  • connection angle ⁇ of the side support wall 74 to the inner wall portion 71 is preferably substantially perpendicular. More specifically, the connection angle is 0 ° 70 ° — 110 ° (ie, 90 ° ⁇ 20 °). The angle is more preferably in the range of 80 ° to 100 °.
  • This coupling angle ⁇ is an angle formed between the center lines Nl, N2 of the side support walls 74 and the tangent Q on the inner peripheral surface of the inner wall portion 71 intersecting the center lines Nl, N2.
  • the center line N 1 in the thickness direction of one side support wall 74 and the center line N 2 in the thickness direction of the other side support wall 74 are the center line in the thickness direction of the center support wall 73. It intersects L at one point of intersection R, and this intersection R is located radially outside the outer peripheral surface 2a of the large-diameter-side mounting portion 2.
  • the side supporting walls 74, 74 are circumferentially separated from the connecting portion, which is not connected to the outer wall portion 72 at the connecting portion of the central supporting wall 73 to the outer wall portion 72. At the position shown, it is joined to the outer wall 72.
  • the thickness of the outer wall 72 at the center thereof can be reduced, so that the occurrence of sink after molding can be more effectively prevented.
  • 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 inner pair of lightening holes 75b and 75c partitioned by the central support wall 73 has a trapezoidal cross section 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.
  • the outer peripheral surface 2a of the large-diameter mounting portion 2 has a circumferentially extending fixing member for receiving a ring-shaped band 9 (see FIG. 10) as a fastening member.
  • a recess 60 is provided.
  • two ribs 61 extending in the circumferential direction are provided on the inner peripheral surface of the large-diameter 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 part 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. It is injection molded into a tapered cylinder. 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 Norrison 15 thus injection-molded is taken out of the molding die of the molding apparatus A, and cooled (natural cooling) at room temperature.
  • the cooled parison 15 then divides the first part 12, the second part 13 and the second part 13 as shown in FIG. Only the third part 14 of the three parts 14 is heated to the set temperature (for example, 160 ° C-200 ° C) by the heating device B.
  • the heating device B is configured as follows so that a plurality of parisons 15 can be heated continuously.
  • a plurality of stepped cylindrical supports 16 for the parisons 15 are arranged on the lower conveyor 17 in a vertical position at regular intervals in the transport direction.
  • 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 includes a support base 19 at the lower end, a lower fitting part 20 having a diameter smaller than that of the first base part 12 and concentrically fitting the first part 12, and a third part 14. It comprises a column-shaped upper and lower middle part 21 which is surrounded by a space, and an upper fitting part 22 provided at the upper end of the upper and lower middle part 21 to externally fit the second part 13 concentrically.
  • a plurality of cylindrical cover members 24 are suspended from the upper conveyor 23 opposed to the lower conveyor 17 at regular intervals in the conveyance direction, and are supported.
  • 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 is a member that covers the parison 15 held on the support body 16 and limits the location where the heat rays from the heater 53 are irradiated.
  • a large-diameter cylindrical first cover portion 41 that surrounds the first portion 41 and a small-diameter cylindrical second cover portion 42 that surrounds the outer periphery of the second portion 13 with a gap therebetween are provided.
  • the two cover portions 42 are connected by a connection portion 43, and a heating opening 44 is provided at a location corresponding to the third portion 14.
  • the cover member 24 concentrically surrounds the parison 15 over its entire height, that is, from the first portion 12 to the second portion 13.
  • the first cover part 41 and the second cover part 42 have a stepped cylindrical shape connected via a step part 24c, and have a top plate part 24d for closing the upper end thereof.
  • the cover member 24 is provided in a non-contact manner with any part of the Norison 15, thereby preventing a contact mark during heating from remaining on the surface of the Norson 15.
  • the cylindrical body The heating opening 44 is provided at a location that covers the third portion 14 of the heater, and the opening 44 faces a pair of heaters 53 provided on both lateral outer sides of the conveyors 17 and 23, respectively.
  • the cover member 24 is provided at two locations diametrically opposed to each other.
  • the height of the opening 44 is set at the lower end 44a at the boundary between the first portion 12 and the third portion 14 and at the upper end 44b so that heat rays from the heater, that is, far infrared rays, are emitted only to the third portion 14. Is set at the boundary between the second part 13 and the third part 14. This prevents the cover member 24 from being irradiated with far-infrared rays from the heater 53 on the first portion 12 and the second portion 13, so that the cover member 24 is not heated, and the height of the cover member 24 is high on the third portion 14.
  • the parison 15 is covered so that far infrared rays from the heater 53 are emitted in all directions.
  • 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 ( (Not shown), a gas is injected into the inner peripheral surface of the third part 14, and the third part 14 is pressed against the outer mold 51 to be bellows.
  • Form part 5 (Not shown), a gas is injected into the inner peripheral surface of the third part 14, and the third part 14 is pressed against the outer mold 51 to be bellows.
  • 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 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 at the time of parison molding. 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 then the third portion 14 is blow-molded, the third portion 14 in a state before the blow molding is performed. 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 third portion 14 is heated from the radially outer side while rotating the support 16 around the axis O, the third portion 14 can be uniformly heated. Also, the third portion 14 heats the parison 15 so as to concentrically surround the upper and lower intermediate portions 21 of the support 16 at intervals, so that the inner peripheral portion of the third portion 14 is cooled by the support 16. It is possible to prevent the temperature difference between the inner peripheral surface side and the outer peripheral surface side of the third portion 14 where the temperature difference occurs. Therefore, it is possible to cause more variation in the temperature distribution of the third portion 14.
  • the large-diameter mounting portion 2 can be formed into a desired shape with high precision, and the large-diameter mounting portion 2 can be immediately attached to the outer case. Can improve the adhesion.
  • the side support wall 74 Since it is provided to be inclined so as to approach, the cross-sectional area of the outer lightening holes 75a and 75d can be secured, and the core can be removed from the mold easily. Further, since 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 configuration in which the lightening holes are provided with the four lightening holes 75a-75d in the convex portion 7 is not limited to this.
  • the present invention can be applied to a large-diameter side mounting portion having a convex portion, which can dramatically improve the dimensional accuracy of the convex portion and can contribute to the elimination of seal leakage. Further, the method of the present invention can be applied to a case where such a lightening hole is not provided.
  • 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 in 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

Procédé de fabrication d’un soufflet de protection d’articulation pour réaliser le moulage uniforme de l’épaisseur de paroi d’une partie de soufflet. Une paraison cylindrique (15) formée d’une première portion (12) correspondant à une partie de montage latéral de grand diamètre (2), d’une deuxième portion (13) correspondant à une partie de montage latéral de petit diamètre (4) et d’une troisième portion (14) reliant ces deux portions entre elles est moulée par injection à l’aide d’un matériau de moulage. Une fois la paraison refroidie, la paraison (15) est soutenue par un corps de soutien (16), de façon à ce que la troisième portion (14) puisse entourer concentriquement la partie intermédiaire verticale (21) du corps de soutien (16) à une certaine distance de séparation. Seule la troisième portion (14) parmi la première portion, la deuxième portion et la troisième portion est chauffée, à partir du côté radial extérieur, jusqu’à une température de consigne par un élément chauffant (B), puis la troisième portion est recouverte d’un moule extérieur (51), un gaz est injecté sur la surface périphérique intérieure de la troisième portion et la troisième portion est comprimée contre le moule extérieur pour mouler par soufflage une partie de soufflet (5).
PCT/JP2005/004827 2004-06-03 2005-03-17 Procede de fabrication de soufflet de protection d’articulation WO2005118258A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2004-165698 2004-06-03
JP2004165698 2004-06-03
JPPCT/JP2004/015795 2004-10-25
PCT/JP2004/015795 WO2005118256A1 (fr) 2004-06-03 2004-10-25 Procédé de production de carter de joint et dispositif de chauffage utilisant ce procédé

Publications (1)

Publication Number Publication Date
WO2005118258A1 true WO2005118258A1 (fr) 2005-12-15

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PCT/JP2005/004827 WO2005118258A1 (fr) 2004-06-03 2005-03-17 Procede de fabrication de soufflet de protection d’articulation
PCT/JP2005/004826 WO2005118257A1 (fr) 2004-06-03 2005-03-17 Procede de fabrication de soufflet de protection d’articulation

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/JP2005/004826 WO2005118257A1 (fr) 2004-06-03 2005-03-17 Procede de fabrication de soufflet de protection d’articulation

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WO (2) WO2005118258A1 (fr)

Citations (5)

* 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
JPH10272679A (ja) * 1997-03-28 1998-10-13 Keeper Co Ltd インジェクションブロー成形用金型構造
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 (5)

* 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
JPH10272679A (ja) * 1997-03-28 1998-10-13 Keeper Co Ltd インジェクションブロー成形用金型構造
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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