WO2013072958A1 - 保護カバーとその製造方法 - Google Patents
保護カバーとその製造方法 Download PDFInfo
- Publication number
- WO2013072958A1 WO2013072958A1 PCT/JP2011/006366 JP2011006366W WO2013072958A1 WO 2013072958 A1 WO2013072958 A1 WO 2013072958A1 JP 2011006366 W JP2011006366 W JP 2011006366W WO 2013072958 A1 WO2013072958 A1 WO 2013072958A1
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- WIPO (PCT)
- Prior art keywords
- valley
- protective cover
- outer diameter
- valley portion
- bellows
- Prior art date
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Classifications
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- 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
- F16J15/00—Sealings
- F16J15/50—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall
- F16J15/52—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall by means of sealing bellows or diaphragms
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- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/38—Covers for protection or appearance
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- 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
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- 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
- F16J3/043—Non-metallic bellows with particular means for limiting wear
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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
- 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
- B29C49/04—Extrusion blow-moulding
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- 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
- B29L2022/00—Hollow articles
- B29L2022/02—Inflatable articles
- B29L2022/025—Bladders
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- 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
- B29L2031/755—Membranes, diaphragms
Definitions
- the present invention relates to a protective cover that is extrapolated to members that should be allowed to expand and contract, such as shock absorbers and robot arms of automobile suspensions and the like, and prevents the attachment of foreign matters such as water and dust to these members and the manufacture thereof. It is about the method.
- a cylindrical protective cover is used.
- This protective cover is provided with a bellows part in which a peak part and a valley part are continuous at least in part, and is provided with stretchability in the axial direction by deformation of the bellows part.
- Patent Document 1 Japanese Utility Model Publication No. 4-973
- the expansion / contraction stroke (difference between the axial dimension at the time of expansion and the axial dimension at the time of contraction) is set sufficiently large in order to ensure followability to expansion / contraction and bending of the mounting target member. It is desirable.
- the present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is to expand and contract in the axial direction by increasing the axial dimension during expansion and decreasing the axial dimension during contraction.
- An object of the present invention is to provide a protective cover having a novel structure capable of ensuring a large stroke and a method for manufacturing the same.
- the bellows portion is formed into a cylindrical shape and has a plurality of alternately formed valley portions that are concave on the outer peripheral side and peak portions that are convex on the outer peripheral side.
- the valley portion of the bellows portion has a large valley portion and a middle valley portion whose inner and outer diameters are larger than the large valley portion, and each of the large valley portion and the middle valley portion is alternately arranged.
- a small valley portion having an inner and outer diameter that is larger than the middle valley portion and provided between the large valley portion and the middle valley portion, and between the large valley portion and the small valley portion, and
- the crests are respectively formed between the middle trough and the small trough, and the outer diameters of the crests of the plurality of crests are made the same, and the crests of the crests are more than the bottoms of the vats. It is also characterized by being thin.
- the diameter of the bellows portion is increased by providing the small valley portion between the large valley portion and the middle valley portion in the axial dimension at the time of extension. It is secured largely without requiring.
- the axial dimensions when the protective cover is contracted are such that the oval and middle valleys are alternately formed, and the inner and outer diameters of the bottom of the middle valley are larger than the inner and outer diameters of the bottom of the great valley. By making it smaller.
- the top part of the peak part is thinner than the bottom part of the large valley part, it is possible to prevent the axial dimension during contraction from increasing in the outer peripheral part where the small valley part is present. By these, it is possible to realize a protective cover that ensures a large expansion / contraction stroke in the axial direction.
- the peak portions can be provided with the maximum allowable outer diameter size over the entire length of the bellows portion. Therefore, the axial dimension at the time of extension can be secured efficiently, and the expansion / contraction stroke of the protective cover can be further increased.
- the difference between the outer diameter of the top of the peak and the outer diameter of the bottom of the middle valley is the top of the peak.
- the outer diameter dimension of the ridge and the inner diameter dimension of the bottom of the large valley portion are 2/3 times or more.
- the bottom part of the middle valley part is sufficiently dislocated to the outer peripheral side with respect to the bottom part of the large valley part, so that the bottom part of the middle valley part and the bottom part of the great valley part interfere when the protective cover contracts.
- the axial dimension can be reduced, and the expansion / contraction stroke can be improved.
- the difference between the outer diameter of the top of the peak and the inner diameter of the bottom of the valley is the peak.
- the difference between the outer diameter of the top and the inner diameter of the bottom of the large valley is 1/3 times or less.
- the bottom of the valley is sufficiently dislocated to the outer peripheral side with respect to the bottom of the middle valley, the bottom of the valley and the bottom of the middle valley interfere when the protective cover contracts.
- the axial dimension can be reduced, and the expansion / contraction stroke can be improved.
- the bellows portion is gradually thinner toward the outer peripheral side.
- the bellows portion is gradually thinned toward the outer peripheral side, the middle portion of the large valley portion that is overlapped in the axial direction with the bottom portion of the middle valley portion at the time of contraction is compared with the bottom portion of the large valley portion.
- it is thin, and the dimension in the axial direction is made smaller.
- the formation part of the small valley part is made thin, it is also prevented that the axial dimension at the time of shrinkage
- a fifth aspect of the present invention is the protective cover described in any one of the first to fourth aspects, wherein the bellows portion is formed of a material containing a thermoplastic resin.
- a thin bellows portion can be easily obtained by being formed of a material containing a thermoplastic resin. Therefore, the stretchability of the bellows portion can be increased, and the weight and cost can be reduced.
- a manufacturing method of the protective cover according to any one of the first to fifth aspects, wherein the molding metal has an uneven surface corresponding to the bellows portion on an inner surface of the cavity.
- a step of preparing a mold a step of forming a bag-like parison in which a thermoplastic resin is heated and softened in the cavity of the molding die, and a compressed gas is blown into the central hole of the parison to Expanding the diameter and pressing the inner surface of the molding die against the cavity inner surface to obtain a molded product, cooling and solidifying the molded product, and taking out the cooled and solidified molded product from the molding die.
- a step of excising the site is
- the manufacturing method of the protective cover according to the sixth aspect it is possible to easily obtain the bellows part in which the top part of the peak part is thinner than the bottom part of the Otani part due to the thickness difference peculiar to blow molding. Can do.
- the valley portion of the bellows portion has a large valley portion, a middle valley portion whose inner and outer diameter dimensions are larger than those of the large valley portion, and an inner and outer diameter dimension of the bottom portion which is larger than that of the middle valley portion. And has a small valley. Therefore, when the bellows portion is extended, the small valley portion is deformed in addition to the deformation of the large valley portion and the middle valley portion, so that a large axial dimension can be secured efficiently without requiring a large diameter.
- the axial dimension is suppressed by avoiding overlapping of the bottom parts between the Otani part and the Nakatani part and between the Nakatani part and the Otani part, and the top part of the peak part is at the bottom part of the Otani part.
- the top part of the peak part is at the bottom part of the Otani part.
- the longitudinal cross-sectional view which shows the dust cover as one Embodiment of this invention in the mounting state to a suspension mechanism.
- the perspective view of the dust cover shown by FIG. The top view of the dust cover shown by FIG. IV-IV sectional drawing in FIG.
- the longitudinal cross-sectional view which shows the contraction state of the dust cover shown by FIG. It is a figure which expands and shows the principal part of the dust cover shown by FIG. 1, Comprising: (a) shows an expansion
- FIG. 1 shows a dust cover 10, which is an embodiment of a protective cover structured according to the present invention, mounted on a shock absorber 12 of a suspension mechanism.
- the vertical direction means the vertical direction in FIG. 1 that is the axial direction of the dust cover 10 in principle.
- the dust cover 10 has a thin, generally cylindrical shape as a whole, and is formed of a rubber elastic body, a synthetic resin or the like and has elasticity. is doing.
- the rubber elastic body and the synthetic resin forming the dust cover 10 are not particularly limited.
- polypropylene (PP) as a thermoplastic resin is mixed with ethylene / propylene rubber (EPDM). Dispersed ones are adopted because they are excellent in weather resistance, moldability and the like.
- thermoplastic resin for example, polyolefin resins such as polypropylene and polyethylene, polyamide resins, polyvinyl chloride resins, polyester resins, urethane resins, styrene resins, olefin resins, etc. Any of these thermoplastic elastomers can be employed.
- thermoplastic resin for example, polyolefin resins such as polypropylene and polyethylene, polyamide resins, polyvinyl chloride resins, polyester resins, urethane resins, styrene resins, olefin resins, etc. Any of these thermoplastic elastomers can be employed.
- rubber elastic body it is possible to use either synthetic rubber or natural rubber.
- a substantially cylindrical upper mounting portion 14 is provided at the upper axial end portion of the dust cover 10, and a substantially cylindrical lower mounting portion 18 is provided at the lower axial end portion of the dust cover 10. It has been.
- a bellows portion 24 is provided in the middle portion of the dust cover 10 in the axial direction.
- the bellows portion 24 has a plurality of peak portions 26 that are convex toward the outer peripheral side and a plurality of valley portions 28 that are concave toward the outer peripheral side. Are formed alternately.
- the mountain portion 26 is continuously formed over the entire circumference with a predetermined cross-sectional shape that becomes gradually narrower in the axial direction toward the outer peripheral side. Further, the plurality of peak portions 26 have the same outer diameter size at the top, and the maximum outer diameter size of the bellows portion 24 is substantially constant.
- valleys 28 are provided between the crests 26 that are adjacent in the axial direction, and each valley 28 has a V-shaped cross section that gradually expands in the axial direction toward the outer peripheral side, and extends over the entire circumference. It is formed continuously.
- the valley portion 28 is constituted by a plurality of each of the Oya portion 30, the Nakaya portion 32, and the Oya portion 34.
- the large valley portion 30 has the largest dimension (depth dimension) from the inner peripheral surface of the bottom portion to the top portion of the peak portion 26, in other words, the valley portion having the smallest inner and outer diameter dimensions of the bottom portion, and toward the outer peripheral side. It has a V-shaped cross section that expands gradually in the axial direction.
- the middle valley portion 32 is a valley portion whose inner and outer diameter dimensions of the bottom portion are made smaller than that of the large valley portion 30, and has a V-shaped cross section that gradually expands in the axial direction toward the outer peripheral side.
- a plurality of Otani portions 30 and Nakatani portions 32 are alternately provided in the axial direction.
- the small valley part 34 is a valley part whose inner and outer diameter dimensions of the bottom part are further smaller than the middle valley part 32, and has a V-shaped cross section that gradually expands in the axial direction toward the outer peripheral side. And it is provided in order so that the small valley part 34 may be located between the large valley part 30 and the middle valley part 32, respectively, and the boundary part between the large valley part 30 and the small valley part 34 and the boundary part between the middle valley part 32 and the small valley part 34, respectively.
- a mountain portion 26 is formed.
- the trough portion 28 is configured by repeatedly providing a set in the axial direction in the order of the large valley portion 30, the small valley portion 34, the middle valley portion 32, and the small valley portion 34 in the axial direction. Yes.
- the thickness dimension (D 7 -D 6 ) at the top of the peak portion 26 is equal to the thickness dimension (D 1 -D 0 ) at the bottom of the large valley portion 30. ) (D 7 -D 6 ⁇ D 1 -D 0 ).
- the bellows portion 24 is gradually thinned toward the outer peripheral side, and the top portion of the mountain portion 26 is the thinnest.
- the inner and outer diameter dimensions of the Otani portion 30 and the Nakatani portion 32 are set so that their bottom portions are positioned away from each other in the radial direction. That is, the inner diameter dimension (D 2 ) at the bottom of the middle valley 32 is larger (D 1 ⁇ D 2 ) than the outer diameter (D 1 ) at the bottom of the large valley 30, and the bottom of the middle valley 32 is It is located on the outer peripheral side from the bottom of the Otani portion 30.
- the inner and outer diameters of the middle valley portion 32 and the large valley portion 30 are set so that the bottom portions thereof are positioned away from each other in the radial direction. That is, the inner diameter dimension (D 4 ) at the bottom of the small valley part 34 is larger (D 3 ⁇ D 4 ) than the outer diameter dimension (D 3 ) at the bottom of the middle valley part 32, and the bottom of the small valley part 34 is It is located on the outer peripheral side of the bottom of the middle valley portion 32.
- the difference (D 7 -D 3 ) between the outer diameter dimension (D 7 ) at the top of the peak portion 26 and the outer diameter dimension (D 3 ) at the bottom portion of the middle valley portion 32 is More than 2/3 times the difference (D 7 -D 0 ) between the outer diameter dimension (D 7 ) at the top and the inner diameter dimension (D 0 ) at the bottom of the large valley 30 (D 7 -D 3 ⁇ (D 7 -D 0 ) * 2/3).
- the difference (D 7 -D 4 ) between the outer diameter dimension (D 7 ) at the top of the peak portion 26 and the inner diameter dimension (D 4 ) at the bottom of the small valley portion 34 is the top portion of the peak portion 26.
- the difference (D 5 -D 3 ) between the outer diameter dimension (D 5 ) at the bottom of the small valley portion 34 and the outer diameter dimension (D 3 ) at the bottom of the middle valley portion 32 is
- the difference (D 3 -D 1 ) between the outer diameter dimension (D 3 ) at the bottom of the portion 32 and the outer diameter dimension (D 1 ) at the bottom of the large valley portion 30 is set to 2.5 times or more.
- the bottom part of the small valley part 34 is arrange
- D 0 is the inner diameter dimension at the bottom of the large valley portion
- D 1 is the outer diameter dimension at the bottom of the large valley portion
- D 2 is the inner diameter dimension at the bottom of the middle valley portion 32
- D 3 is the middle valley portion 32.
- D 4 is the inner diameter dimension at the bottom part of the valley part 34
- D 5 is the outer diameter dimension at the bottom part of the valley part 34
- D 6 is the inner diameter dimension at the top part of the peak part 26
- D 7 is the peak part 26.
- the outer diameter dimensions at the top are shown respectively.
- the dust cover 10 having such a structure according to the present embodiment is mounted on a suspension mechanism of an automobile as shown in FIG. More specifically, the dust cover 10 is provided so as to cover the upper end portion of the cylinder 36 of the shock absorber 12 and the lower portion of the piston rod 38. And the upper end part of the dust cover 10 is attached to the vehicle body by inserting the lower end part of the upper side spring receiving member 40 attached to the vehicle body (not shown) into the upper attaching part 14, and the cylinder 36 is The lower end portion of the dust cover 10 is attached to the cylinder 36 by being inserted into the lower attachment portion 18.
- the dust cover 10 In such a state where the dust cover 10 is mounted on the suspension mechanism, when the shock absorber 12 expands and contracts by input from the road surface, the dust cover 10 expands and contracts following the expansion and contraction operation of the shock absorber 12. That is, when the shock absorber 12 is in the extended state, the dust cover 10 is in the extended state shown in FIG. 4, and in the contracted state of the shock absorber 12, the dust cover 10 is in the contracted state shown in FIG. The axial dimension is reduced.
- Such expansion and contraction in the axial direction of the dust cover 10 is allowed by elastic deformation of the bellows portion 24. That is, the bellows part 24 is deformed so that the axial dimension of the opening of each valley part 30, 32, 34 is increased, whereby the extended state of the dust cover 10 is realized, and each valley part 30, 32, 34 is formed.
- the contraction state of the dust cover 10 is realized by the deformation of the bellows portion 24 so that the axial dimension of the opening portion becomes small.
- the dust cover 10 is provided with the large valley portion 30, the middle valley portion 32, and the small valley portion 34, so that a large expansion / contraction stroke, which is a difference between the axial dimension in the expanded state and the axial dimension in the contracted state, is secured. Has been.
- the maximum outer diameter dimension of the bellows portion 24 is increased by providing the small valley portion 34 between the large valley portion 30 and the middle valley portion 32. Without increasing the size, the size in the axial direction is ensured by a size corresponding to the expansion size of the valley portion 34.
- the middle valley portion 32 and the small valley portion 34 are provided between the large valley portions 30 and 30 adjacent in the axial direction, so that the thickest portion is provided.
- the bottom part of the Otani part 30 used as meat is located apart in the axial direction.
- the bottom part of the middle valley part 32 is located on the outer peripheral side with respect to the bottom part of the large valley part 30, and the bottom part of the middle valley part 32 and the bottom part of the large valley part 30 adjacent in the axial direction are not aligned in a straight line in the contracted state. Arranged in a zigzag. Thereby, it is possible to prevent the axial dimension from increasing due to the overlap in the axial direction between the bottom of the middle valley 32 and the bottom of the large valley 30.
- the bellows portion 24 gradually becomes thinner toward the outer peripheral side, the bottom portion of the middle valley portion 32 is arranged so as to overlap the middle portion of the large valley portion 30 in the axial direction, so that the axial dimension is further increased. It is suppressed.
- a small valley portion 34 having a larger inner and outer diameter dimension at the bottom than the middle valley portion 32 is provided.
- the dimension in the axial direction is suppressed.
- the accordion portion 24 is gradually thinned toward the outer peripheral side, and the small valley portion 34 and the outer end portions of the large valley portion 30 and the middle valley portion 32 that wrap around the small valley portion 34 are thinned.
- the axial dimension in the outer peripheral part provided with is reduced.
- the difference between the outer diameter dimension at the top of the peak portion 26 and the outer diameter dimension at the bottom portion of the middle valley portion 32 is the difference between the outer diameter dimension at the top portion of the peak portion 26 and the inner diameter dimension at the bottom portion of the large valley portion 30.
- it is 2/3 times or more.
- the difference between the outer diameter dimension at the top of the peak portion 26 and the inner diameter dimension at the bottom portion of the small valley portion 34 is the difference between the outer diameter dimension at the top portion of the peak portion 26 and the inner diameter dimension at the bottom portion of the large valley portion 30.
- the difference is 1/3 times or less.
- the small valley part 34 is arrange
- the top part of the peak part 26 is provided with the substantially constant outer diameter dimension, and it has overlapped and arrange
- the bellows portion 24 provided in the dust cover 10 includes the large valley portion 30, the middle valley portion 32, and the small valley portion 34, so that the axial dimension in the expanded state needs to increase in diameter.
- the axial dimension in the contracted state is reduced and the expansion / contraction stroke is ensured to be large.
- the dust cover 10 having excellent stretchability is realized, and the dust cover 10 that can sufficiently follow the expansion and contraction operation of the shock absorber 12 is provided even in a structure in which the upper and lower ends are fixed to the suspension mechanism. be able to.
- a small valley portion 34 having a radial depth smaller than that of the large valley portion 30 and the middle valley portion 32 is provided, and two peak portions 26 are provided between the large valley portion 30 and the middle valley portion 32.
- the strength of the bellows portion 24 in the radial direction is increased. Therefore, in the operation of attaching the dust cover 10 to the suspension mechanism or the like, unintentional deformation of the bellows portion 24 such as the ridge portion 26 being recessed in the radial direction is prevented, and the dust cover 10 is held in a predetermined shape.
- a material for forming the dust cover 10 a material containing a thermoplastic resin is employed, so that the bellows portion 24 is made thinner than in the case where the material is made of a material other than a synthetic resin (such as rubber).
- the axial dimension of the dust cover 10 at the time of contraction can be reduced.
- the dust cover 10 having the structure according to the present embodiment is formed by, for example, a blow molding method having the following steps.
- a pair of molding dies 44a and 44b having an inner surface of a cavity 50 corresponding to the outer shape of the dust cover 10 is prepared. Thereby, the preparation process of the molding die is completed.
- the molding dies 44 a and 44 b have a concave and convex surface 46 corresponding to the outer peripheral surface shape of the bellows portion 24 (repetitive shape of the large valley portion 30, the small valley portion 34, the middle valley portion 32, and the small valley portion 34). It is provided in a part of the inner peripheral surface.
- a parison 48 which is a cylindrical forming material softened by heating, is disposed between the molding dies 44a and 44b.
- the parison 48 is formed of a material obtained by mixing and dispersing ethylene / propylene rubber (EPDM) in polypropylene (PP) as described above, and is formed into a cylindrical shape by extrusion or injection. It is arranged between the molding die 44a and the molding die 44b. Further, a nozzle 58 described later is inserted into the upper opening of the parison 48.
- EPDM ethylene / propylene rubber
- PP polypropylene
- the molding die 44a and the molding die 44b are brought close to each other, and the parison 48 is crushed at the lower end portion, thereby forming the parison 48 into a bag shape having only the upper end portion opened.
- a sealed cavity 50 is formed between the molding dies 44 a and 44 b, and the parison 48 is disposed in the cavity 50.
- the pressure of the hollow portion of the parison 48 is increased by sending compressed gas (compressed air) from the compressed gas supply device 52 provided outside to the nozzle 58 through the valve 54 and the pressure adjusting device 56.
- compressed gas compressed air
- the parison 48 is deformed so as to expand in the radial direction and is pressed against the inner surface of the cavity 50 as shown in FIG. .
- the parison 48 is molded into a shape corresponding to the inner surface of the cavity 50 to complete the molding process of obtaining the molded product 60 having a predetermined shape.
- the cylindrical parison 48 formed with a substantially constant thickness and diameter is expanded and deformed by the pressure of the compressed gas and molded into a predetermined shape defined by the inner surface of the cavity 50.
- the molded product 60 becomes thinner toward the outer peripheral side.
- FIG. 7B the direction of the pressure applied by the compressed gas is indicated by arrows, and the lines indicating the irregularities on the inner peripheral surface of the molded product 60 are omitted for the sake of clarity. ing.
- the molding dies 44a and 44b are cooled, and the molded product 60 is cooled and solidified, whereby the molded product 60 is predetermined. Stabilize in shape. Thus, the cooling process is completed.
- the cooling method of the molding dies 44a and 44b is not particularly limited, but cooling using cooling water or the like can be employed in addition to cooling with air.
- the molding dies 44a and 44b are separated from each other, and the molded product 60 cooled and solidified from the cavity 50 between the molding dies 44a and 44b is obtained. Take out. Finally, the axial ends of the molded product 60 taken out are cut along the cutting lines A and B, and the finishing process is completed, whereby the dust cover 10 according to the present embodiment is obtained.
- the blow molding method is adopted as the manufacturing method of the dust cover 10
- the bellows portion 24 that becomes gradually thinner toward the outer peripheral side can be easily realized, and the stretchability in the axial direction is excellent.
- the dust cover 10 can be obtained.
- the number of peak portions 26 and valley portions 28 constituting the bellows portion 24 is not particularly limited, and the length of the bellows portion 24 is merely an example.
- each trough part 30,32,34 does not necessarily need to be the same as the thing of embodiment.
- the difference between the outer diameter dimension (D 5 ) of the bottom of the small valley part 34 and the outer diameter dimension (D 3 ) of the bottom of the middle valley part 32 is the outer diameter of the bottom part of the middle valley part 32.
- the difference between the dimension (D 3 ) and the outer diameter dimension (D 1 ) of the bottom portion of the Otani portion 30 was 2.5 times or more.
- the valley portions 30, 32, and 34 may be formed so that the difference in depth of the intermediate valley portion 32 is substantially the same as the difference in depth between the intermediate valley portion 32 and the small valley portion 34.
- the dimensions and shapes of the large valley portion 30, the middle valley portion 32, and the small valley portion 34 can be changed according to the stretchability and the stretch stroke required for the bellows portion 24, and are not particularly limited. .
- the upper end of the dust cover 10 is fixed to the vehicle body and the lower end is fixed to the cylinder 36 on the wheel side. With the operation, both expansion deformation and contraction deformation can be generated.
- the dust cover 10 may be configured such that only one end in the axial direction is fixed to the mounting target member, and only one of the expansion deformation and the contraction deformation is caused as the mounting target member expands and contracts. .
- the upper end portion of the dust cover 10 is fixed to the vehicle body, and the lower end portion is a free end that is merely extrapolated to the cylinder 36.
- a blow molding method is suitable as a method of manufacturing the dust cover 10,
- a manufacturing method is not specifically limited, For example, it can manufacture also by rotational molding etc.
- the dust cover 10 for suspension is illustrated, but the present invention can also be suitably applied to a protective cover used for other parts of the automobile.
- the scope of application of the present invention is not limited to a protective cover for automobiles, and for example, a protective cover for protecting a joint portion of a robot arm or the like is also included in the scope of application of the present invention.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Diaphragms And Bellows (AREA)
- Sealing Devices (AREA)
- Fluid-Damping Devices (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
Claims (6)
- 筒状とされて、外周側に凹となる谷部と外周側に凸となる山部とが交互にそれぞれ複数形成された蛇腹部を少なくとも一部に有する保護カバーにおいて、
前記蛇腹部の前記谷部が大谷部と該大谷部に比して底部の内外径寸法が大きい中谷部とを有しており、それら大谷部と中谷部が交互に各複数形成されていると共に、該中谷部に比して底部の内外径寸法が大きい小谷部がそれら大谷部と中谷部の間にそれぞれ設けられている一方、
該大谷部と該小谷部の間および該中谷部と該小谷部の間にそれぞれ前記山部が形成されて、それら複数の該山部の頂部の外径寸法が同じにされていると共に、該山部の頂部が該大谷部の底部よりも薄肉とされていることを特徴とする保護カバー。 - 前記山部の頂部の外径寸法と前記中谷部の底部の外径寸法との差が、該山部の頂部の外径寸法と前記大谷部の底部の内径寸法との差の2/3倍以上とされている請求項1に記載の保護カバー。
- 前記山部の頂部の外径寸法と前記小谷部の底部の内径寸法との差が、該山部の頂部の外径寸法と前記大谷部の底部の内径寸法との差の1/3倍以下とされている請求項1又は2に記載の保護カバー。
- 前記蛇腹部が外周側に向かって次第に薄肉となっている請求項1~3の何れか1項に記載の保護カバー。
- 前記蛇腹部が熱可塑性樹脂を含んだ材料で形成されている請求項1~4の何れか1項に記載の保護カバー。
- 請求項1~5の何れか1項に記載された保護カバーの製造方法であって、
キャビティ内面に前記蛇腹部に対応する凹凸面を備えた成形用金型を準備する工程と、
該成形用金型のキャビティ内に熱可塑性樹脂を加熱して軟化させた袋状のパリソンを形成する工程と、
該パリソンの中心孔に圧縮ガスを吹き込んで該パリソンを拡径させ、該成形用金型のキャビティ内面に押し付けて成形品を得る工程と、
該成形品を冷却固化する工程と、
冷却固化された該成形品を該成形用金型から取り出して所定の部位を切除する工程と
を有することを特徴とする保護カバーの製造方法。
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PCT/JP2011/006366 WO2013072958A1 (ja) | 2011-11-15 | 2011-11-15 | 保護カバーとその製造方法 |
CN201180055044.9A CN103210233B (zh) | 2011-11-15 | 2011-11-15 | 保护罩及其制造方法 |
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CN103210233B (zh) | 2015-04-01 |
JP5475146B2 (ja) | 2014-04-16 |
DE112011105852B4 (de) | 2022-09-29 |
JPWO2013072958A1 (ja) | 2015-04-02 |
DE112011105852T5 (de) | 2014-09-04 |
CN103210233A (zh) | 2013-07-17 |
US9470316B2 (en) | 2016-10-18 |
US20140035232A1 (en) | 2014-02-06 |
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