WO2014148240A1 - ダストカバー組立体 - Google Patents
ダストカバー組立体 Download PDFInfo
- Publication number
- WO2014148240A1 WO2014148240A1 PCT/JP2014/055338 JP2014055338W WO2014148240A1 WO 2014148240 A1 WO2014148240 A1 WO 2014148240A1 JP 2014055338 W JP2014055338 W JP 2014055338W WO 2014148240 A1 WO2014148240 A1 WO 2014148240A1
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- WO
- WIPO (PCT)
- Prior art keywords
- dust cover
- upper insulator
- cover assembly
- engagement
- engaging
- 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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
- B60G13/02—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally
- B60G13/06—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dampers dissipating energy, e.g. frictionally of fluid type
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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
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
- F16F1/04—Wound springs
- F16F1/12—Attachments or mountings
- F16F1/126—Attachments or mountings comprising an element between the end coil of the spring and the support proper, e.g. an elastomeric annulus
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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
- F16J3/042—Fastening details
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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
Definitions
- the present invention relates to a dust cover assembly including a dust cover and an upper insulator attached to a suspension mechanism.
- a dust cover assembly that includes a dust cover that is extrapolated to a shock absorber and covers the periphery of the protruding portion of the piston rod, and an upper insulator that supports the upper end of the coil spring.
- a dust cover and an upper insulator are integrally formed of a rubber elastic body.
- the dust cover is connected to the upper insulator integrally with the upper insulator and is supported by the piston rod, thereby preventing foreign matter from entering from above.
- the lower end portion is loosely inserted in a state in which free relative displacement with respect to the cylinder is allowed, and the action of a tensile force on the dust cover is avoided when the shock absorber is extended.
- the gap set between the lower end portion of the dust cover and the cylinder is large, foreign matters such as dust and water may enter from the lower end opening of the dust cover and adhere to the piston rod. Furthermore, the bellows tube portion of the dust cover may be caught in a contracted state, and the dust cover may not be able to follow the expansion and contraction of the shock absorber.
- Patent Document 2 Japanese Patent Application Laid-Open No. 10-331897
- Patent Document 2 Japanese Patent Application Laid-Open No. 10-331897
- the dust cover is forced to expand and contract following the expansion and contraction of the shock absorber, and an axial tensile force can be exerted on the dust cover. It is also being considered to plan.
- the dust cover is made of resin, it cannot be integrally formed with the upper insulator formed of a rubber elastic body in order to obtain a buffering action. In addition, it is difficult to obtain a sufficient fixing strength by post-fixing a resin dust cover to the rubber upper insulator. Although it is conceivable to provide a metal fitting for supporting the upper end portion of the dust cover in the upper insulator, there is a possibility that the number of parts, an increase in weight, or the like may become a problem.
- the present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is that a resin dust cover and a rubber upper insulator are attached to each other easily and with sufficient strength to allow entry of foreign matter. It is an object of the present invention to provide a dust cover assembly having a novel structure capable of realizing excellent durability while effectively preventing the above.
- the resin dust cover that is externally attached to the shock absorber of the suspension mechanism includes a bellows cylinder portion in which a peak portion and a valley portion are continuously provided.
- the upper and lower sides are supported by one of the piston rod and cylinder of the shock absorber, and the upper end of the dust cover is provided with a rubber upper that supports the upper end of the coil spring in the suspension mechanism.
- an engagement tube portion is integrally formed on the upper side of the bellows tube portion of the dust cover, and the engagement groove opens to the outer peripheral surface with respect to the engagement tube portion.
- the dust cover assembly having the structure according to the first aspect, by forming the dust cover with a resin, sufficient durability is ensured even in the case of large expansion and contraction in the axial direction.
- the axial length can be set large to prevent dust and the like from entering from below.
- durability superior to the rubber dust cover is realized.
- the engaging protrusion of the upper insulator is inserted into the engaging groove of the engaging cylinder portion provided in the dust cover and is locked in the axial direction, thereby preventing the rubber upper insulator.
- the engaging cylinder portion of the resin dust cover is assembled in an inserted state, and axial disconnection is prevented.
- the dust cover assembly can be obtained by simply assembling the resin dust cover and the rubber upper insulator, which are difficult to adhere to each other.
- the engagement protrusion is brought into contact with the engagement groove in the circumferential direction.
- a contact portion for defining a moving end in the engagement groove is provided.
- the relative direction of the dust cover and the upper insulator in the circumferential direction is easily set, and the dust cover and the upper insulator are set in a specific relative direction against the action of external force. Can be held in a specific orientation.
- a plurality of rows of the engagement grooves that are vertically separated from the engagement cylinder portion are formed.
- a plurality of rows of the locking protrusions are formed apart from each other in the axial direction with respect to the upper insulator.
- the locking protrusions and the engaging grooves provided at the plurality of positions in the axial direction are respectively locked in the axial direction, the removal of the engaging cylindrical portion with respect to the upper insulator is more effective. Is prevented.
- the locking protrusion dimension (t) is set in the range of T / 4 ⁇ t ⁇ 3T / 4 with respect to the maximum thickness dimension (T) in the direction perpendicular to the axis of the upper insulator including the locking protrusion. Is.
- the dust cover and the upper insulator are assembled with a large pulling effect, and the upper insulator is assembled.
- the deformation rigidity of the portion that supports the locking protrusion is sufficiently ensured, so that the locking of the locking protrusion and the engagement groove due to the deformation of the upper insulator is also prevented.
- the engaging cylinder portion of the dust cover is configured to connect the upper insulator to the upper insulator.
- the upper insulator is fitted into the outer peripheral side in an elastically deformed state, and the upper insulator is elastically brought into close contact with the engaging cylinder portion.
- the rubber upper insulator is brought into close contact with the engaging cylinder portion by its own elastic force, and the locking projection is biased toward the insertion side into the engaging groove.
- the stop protrusion is prevented from coming off from the engaging groove, and the assembled state of the dust cover and the upper insulator is more stably maintained.
- a sixth aspect of the present invention is the dust cover assembly according to any one of the first to fifth aspects, wherein the upper insulator is provided with a cylindrical metal fitting attached to the shock absorber.
- the locking protrusion of the upper insulator is formed so as to be positioned on the outer peripheral side of the cylindrical metal fitting.
- the engagement cylinder portion of the dust cover and the fitting portion of the upper insulator are protected by the cylindrical metal fitting, so that when the shock absorber is greatly contracted, the engagement cylinder portion and the upper insulator The cylinder or the like is prevented from coming into contact with the fitting portion, and the dust cover and the upper insulator are held in the assembled state.
- the engaging cylinder portion of the dust cover is blow-molded on the inner peripheral side of the upper insulator.
- the engaging tube portion is molded, the engaging tube portion is fitted to the inner peripheral surface of the upper insulator, and the locking protrusion is locked in the axial direction with respect to the engaging groove. It is what has been.
- the dust cover engaging cylinder portion and the upper insulator are fitted, so that the assembly operation of the dust cover and the upper insulator becomes unnecessary, and the manufacturing process Is simplified.
- the engaging cylinder and the upper insulator are brought into close contact with each other by the air pressure during blow molding, the engaging protrusion and the engaging groove are also fitted in close contact with each other, thereby increasing the resistance of the dust cover to the upper insulator.
- the upper insulator is a parison which is a blow mold of the dust cover and a material for forming the dust cover when the dust cover is blow molded. And a protective piece which is cut out after the dust cover is formed.
- the protective piece prevents the parison from being pressed against the corner of the blow mold, thereby preventing molding defects due to damage to the parison.
- the protective pieces do not interfere with the attachment of the upper insulator to the suspension mechanism.
- the engaging cylinder portion of the dust cover is inserted into the upper insulator and formed on the inner peripheral surface of the upper insulator with respect to the engaging groove formed on the outer peripheral surface of the engaging cylinder portion.
- the locking projections are inserted, and the engagement grooves and the locking projections are locked in the axial direction. Accordingly, since the resin dust cover can be easily attached to the rubber upper insulator with a sufficient fixing force, it is possible to employ a resin dust cover having excellent durability.
- FIG. 1 is a perspective cross-sectional view showing a dust cover assembly as one embodiment of the present invention in a mounted state on a suspension mechanism.
- the longitudinal cross-sectional view of the dust cover assembly shown by FIG. The longitudinal cross-sectional view which shows the upper insulator which comprises the dust cover assembly shown by FIG. 2 in the state before the assembly
- the longitudinal cross-sectional view which expands and shows the principal part of FIG. It is a longitudinal cross-sectional view explaining the manufacturing process of the dust cover assembly shown by FIG. 2, Comprising: The figure which shows the state after blow molding and before a mold opening.
- FIG. 1 shows a dust cover assembly 10 as an embodiment of the present invention in a mounted state with respect to a suspension mechanism 12 of a vehicle.
- the dust cover assembly 10 includes a dust cover 14 and an upper insulator 16.
- the vertical direction means the vertical direction in FIG. 1 in principle.
- the dust cover 14 has a substantially cylindrical shape as a whole and is made of synthetic resin.
- the synthetic resin forming the dust cover 14 is not particularly limited.
- polypropylene (PP) as a thermoplastic resin is mixed with ethylene / propylene rubber (EPDM) and dispersed.
- EPDM ethylene / propylene rubber
- a 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.
- blow molding is preferably employed, but injection molding can also be employed.
- a bellows tube portion 18 is provided in the middle portion of the dust cover 14 in the axial direction.
- the bellows cylinder portion 18 includes a crest 20 extending in a circumferential annular shape with a substantially roll-over V-shaped section convex on the outer peripheral side, and trough portions 22, 24 extending in a circumferential annular shape with a substantially roll-over V-shaped cross section recessed on the outer peripheral side. , And have a structure in which they are arranged alternately in the axial direction.
- the valleys formed on both the upper and lower sides sandwiching the peak 20 are one having a large valley 22 having a large depth and the other having a small valley 24 having a small depth.
- the end portion and the inner peripheral end portion of the small valley portion 24 are positioned so as to be shifted from each other in the radial direction.
- a fitting tube portion 26 is integrally formed below the bellows tube portion 18.
- the fitting cylinder portion 26 has a substantially cylindrical shape and includes a circumferential groove 28 that opens to the inner circumferential surface.
- the engagement cylinder portion 30 has a substantially cylindrical shape and includes a first engagement groove 32 and a second engagement groove 34.
- the first engagement groove 32 and the second engagement groove 34 are concave grooves that open to the outer peripheral surface and extend in the circumferential direction, respectively, and the first engagement groove 32 is axial with respect to the second engagement groove 34. It is arranged at a predetermined distance above.
- the lower wall portion of the second engagement groove 34 is inclined at a relatively small angle with respect to the axial direction, and the axial dimension of the opening of the second engagement groove 34 is the first. It is made larger than the engaging groove 32.
- first engaging groove 32 and the second engaging groove 34 are formed with contact portions 36 at a plurality of locations in the circumferential direction.
- the contact portion 36 protrudes from the engagement cylinder portion 30 toward the inner peripheral side in the first engagement groove 32 and the second engagement groove 34.
- channel 34 of this embodiment are divided
- the six abutting portions 36 are formed in each, and the engaging grooves 32 and 34 are each divided into six in the circumferential direction.
- the contact portion 36 of the first engagement groove 32 and the contact portion 36 of the second engagement groove 34 are formed at substantially the same position in the circumferential direction.
- the engaging cylinder portion 30 constituting the upper end portion of the dust cover 14 is attached to the upper insulator 16.
- the upper insulator 16 is a substantially annular rubber elastic body as a whole, and integrally includes a spring receiving portion 38 and a cylindrical portion 40.
- the spring receiving portion 38 is annular and includes a cylindrical inner peripheral portion that extends vertically and an outer peripheral portion that protrudes from the upper end portion of the inner peripheral portion toward the outer peripheral side.
- the spring receiving portion 38 is integrally formed with a cylindrical portion 40 protruding downward.
- the tubular portion 40 protrudes from the inner peripheral end of the spring receiving portion 38, and a first locking protrusion 44 and a second locking protrusion 46 are provided on the inner peripheral surface thereof. Both the first locking projection 44 and the second locking projection 46 protrude from the tubular portion 40 toward the inner peripheral side and extend in the circumferential direction.
- the stop protrusions 44 are arranged at a predetermined distance above the axial direction. Further, both the first locking protrusion 44 and the second locking protrusion 46 are gradually narrower in the axial direction toward the protruding tip side.
- first locking protrusion 44 and the second locking protrusion 46 protrude on the inner peripheral side with substantially the same dimension: t, and the protruding dimensions of the first and second locking protrusions 44, 46.
- T is set to a range of T / 4 ⁇ t ⁇ 3T / 4 with respect to the maximum thickness dimension: T of the tubular portion 40 where the first and second locking projections 44 and 46 are formed. Has been. If the projection dimension: t of the first and second locking projections 44, 46 is too small with respect to the maximum thickness dimension: T of the tubular portion 40, first and second engagement grooves 32 described later will be described.
- a dividing groove 48 is formed on the circumference of the first locking projection 44 and the second locking projection 46.
- the dividing groove 48 is a concave groove that opens in the inner peripheral surface and extends in the axial direction, and the first locking protrusion 44 and the second locking protrusion 46 are divided in the circumferential direction by the dividing groove 48.
- division grooves 48 are formed at a plurality of positions on the circumference, and the first and second locking projections 44, 46 are sandwiched between the division grooves 48.
- each of the locking protrusions 44 and 46 is divided into six in the circumferential direction by six dividing grooves 48.
- the dividing groove 48 of the first locking protrusion 44 and the dividing groove 48 of the second locking protrusion 46 are formed at substantially the same position in the circumferential direction.
- the dividing grooves 48 are formed with a circumferential width substantially corresponding to the contact portion 36 and are distributed at positions corresponding to the contact portion 36 on the circumference.
- the dust cover 14 and the upper insulator 16 having such a structure are attached to each other by fitting the engaging cylinder portion 30 to the cylindrical portion 40. That is, the engaging cylinder portion 30 of the dust cover 14 is inserted into the cylindrical portion 40 of the upper insulator 16, and the first engaging groove 32 and the second engagement are opened in the outer peripheral surface of the engaging cylinder portion 30. A first locking projection 44 and a second locking projection 46 of the tubular portion 40 are fitted into the groove 34. As a result, the first and second locking protrusions 44 and 46 and the first and second engaging grooves 32 and 34 are locked in the axial direction, and the engaging cylinder 30 is fitted into the cylindrical portion 40. Therefore, the dust cover assembly 10 is configured.
- the resin dust cover 14 can be easily assembled to the rubber upper insulator 16.
- the first and second engaging grooves 32 and 34 and the first and second locking protrusions 44 and 46 are provided so as to be vertically separated in the axial direction. Therefore, the pulling-out drag force due to the engagement of the first and second engagement grooves 32 and 34 and the first and second engagement protrusions 44 and 46 between the dust cover 14 and the upper insulator 16 is exerted more greatly. The dust cover 14 can be more effectively prevented from coming off from the upper insulator 16.
- a plurality of contact portions 36 that divide the first and second engagement grooves 32 and 34 are provided, and the first and second locking projections 44 and 46 are arranged in the circumferential direction.
- a plurality of dividing grooves 48 to be divided are formed, and the contact portion 36 is fitted into the dividing groove 48 and locked in the circumferential direction.
- the moving ends of the first and second locking projections 44 and 46 in the first and second engagement grooves 32 and 34 are brought into contact with each other by the contact between the contact portion 36 and the dividing groove 48 in the circumferential direction.
- the relative rotation of the dust cover 14 with respect to the upper insulator 16 is restricted. Therefore, the relative direction in the circumferential direction of the dust cover 14 with respect to the upper insulator 16 can be easily set, and the dust cover 14 and the upper insulator 16 can be held in the set direction.
- the assembly of the dust cover 14 and the upper insulator 16 is realized at the time of blow molding of the dust cover 14.
- an example of a method for manufacturing the dust cover assembly 10 will be described.
- a pair of left and right blow molds 50, 50 are prepared, a molding jig 52 is prepared, and the pre-vulcanized upper insulator 16 is set in the molding jig 52.
- the blow molding die 50 includes a half molding surface 54 having a shape corresponding to the outer peripheral surface of the dust cover 14. When the pair of blow molding dies 50, 50 are combined face to face, these blow molding dies 50 are arranged. , 50, and an inner surface of the cavity 56 is formed as a cavity forming surface 58 constituted by the half-molded surfaces 54, 54.
- the forming jig 52 has a substantially bottomed cylindrical shape, and the upper surface of the peripheral wall portion is a support surface 60 having a shape corresponding to the upper surface of the upper insulator 16, and the upper insulator 16 is turned upside down on the support surface 60. It is possible to be mounted on. Further, the upper insulator 16 is integrally formed with an inner flange-shaped protective piece 62 on the base end side of the tubular portion 40, and the protective piece 62 is superimposed on the inner peripheral end portion of the support surface 60. The support surface 60 is entirely covered with the upper insulator 16. Further, a blow pipe 64 protruding upward is provided at a substantially radial center of the forming jig 52, and the blow pipe 64 is compressed from the blow pipe 64 by being connected to an external air pipe (not shown). Air is sent out.
- the parison 68 formed by heating and softening the forming material of the dust cover 14 and being formed into a cylindrical shape by extrusion from the die 66 or the like is inserted between a pair of blow molds 50, 50 arranged apart from each other. At the same time, it is extrapolated to a blow tube 64 fixed to the forming jig 52 at the lower end.
- blow molds 50, 50 and the molding jig 52 are closed, and a cavity 56 is formed between the blow molds 50, 50 and the molding jig 52.
- the forming jig 52 is sandwiched between the lower end portions of the blow molds 50 and 50 so as to constitute the lower wall portion of the cavity 56.
- the upper insulator 16 placed upside down with respect to the support surface 60 of the forming jig 52 is set so that the tubular portion 40 protrudes into the cavity 56. Further, the cylindrical portion 40 of the upper insulator 16 is constrained by overlapping the outer peripheral surface with the blow molding dies 50, 50, and elastic deformation to the outer peripheral side is limited.
- the blow molds 50, 50 are arranged in a state of being slightly separated from the outer peripheral surface of the cylindrical portion 40 toward the outer peripheral side. The elastic deformation to the outer peripheral side is allowed while the deformation amount is limited.
- the parison 68 is formed into a thin cylindrical shape having an outer surface shape corresponding to the cavity forming surface 58, and is a blow molded product 70 including the bellows cylindrical portion 18 and the fitting cylindrical portion 26. Is formed.
- the protective piece 62 is formed between the parison 68 and the forming jig 52 when the parison 68 bulges and deforms.
- the parison 68 is prevented from being pressed against the corner edge of the forming jig 52 and being damaged.
- the parison 68 is pressed against the inner peripheral surface of the tubular portion 40 of the upper insulator 16 by bulging and deforming the parison 68 with air pressure.
- the engaging cylinder part 30 having a shape corresponding to the inner peripheral surface of the cylindrical part 40 is blown and formed in a state of being fitted to the inner peripheral side of the cylindrical part 40.
- first and second engaging grooves 32 and 34 having a shape corresponding to the first and second locking protrusions 44 and 46 provided in the cylindrical portion 40 are formed in the engaging cylinder portion 30.
- a first locking projection 44 is fitted to the first engagement groove 32, and a second locking projection 46 is fitted to the second engagement groove 34.
- the engaging cylinder part 30 is formed in a shape corresponding to the inner peripheral surface of the cylindrical part 40, so that the engaging cylinder part 30 corresponds to the dividing groove 48 provided in the cylindrical part 40.
- a contact portion 36 is formed, and the contact portion 36 enters the dividing groove 48.
- channel 48 are contact-locked in the circumferential direction, and the relative rotation of the dust cover 14 and the upper insulator 16 around the central axis is prevented.
- the inner peripheral surface of the contact portion 36 is smoothly continuous with the inner peripheral surface of the portion of the engagement cylinder portion 30 that is out of the first and second engagement grooves 32, 34.
- the groove on the inner peripheral side communicates with the space between the first engagement groove 32 and the second engagement groove 34 in the axial direction, the first engagement groove 32 and the second engagement groove 34 are formed during blow molding. Air easily flows into the space between the axial directions, and molding by the action of air pressure is realized quickly and reliably.
- the engaging cylinder portion 30 of the dust cover 14 is inserted into the upper insulator 16 and the first and second engagement grooves 32 and 34 are engaged with the first and second engagement grooves 32 and 34.
- the stop protrusions 44 and 46 are inserted, and the dust cover 14 is formed in a state assembled to the upper insulator 16. Therefore, according to the manufacturing method of this embodiment, the process of assembling the dust cover 14 to the upper insulator 16 can be omitted, and the dust cover assembly 10 can be obtained more easily.
- a gap is formed between the tubular portion 40 of the upper insulator 16 and the blow molds 50 and 50, and the elastic deformation of the tubular portion 40 toward the outer peripheral side is limited in the amount of deformation. Since it is allowed, the engaging cylinder part 30 is formed in a shape along the cylindrical part 40 in a state of being expanded to the outer peripheral side by the air pressure at the time of blow molding. Thereby, the cylinder part 30 for engagement of the dust cover 14 is inserted in the state which elastically deformed the cylindrical part 40 to the outer peripheral side with respect to the cylindrical part 40 of the upper insulator 16, and the cylindrical part 40 is inserted. It is elastically in close contact with the engaging cylinder 30. Therefore, in the blow-molded product 70, the inner peripheral surface of the tubular portion 40 and the outer peripheral surface of the engaging tubular portion 30 are more firmly fitted on the basis of the elastic shape restoring force of the tubular portion 40. .
- the blow molded product 70 is cut by the two-dot chain line in FIG. 6 after being removed from the blow molding dies 50, 50, The dust cover assembly 10 is formed by removing unnecessary portions at both ends in the axial direction.
- the protection piece 62 of the upper insulator 16 is cut out together with both axial end portions of the blow molded product 70 after completion of the blow molding.
- the dust cover assembly 10 thus formed is attached to a suspension mechanism 12 of an automobile as shown in FIG.
- the suspension mechanism 12 includes a piston rod 74 and a cylinder 76 that constitute a shock absorber 72, and an upper support 78 is attached to the upper end portion of the piston rod 74.
- the upper support 78 has a structure in which an inner member 80 and an outer member 82 are elastically connected by a main rubber elastic body 84.
- the inner member 80 is fixed to the upper end portion of the piston rod 74, and the outer member 82 projects.
- the plurality of planting bolts 86 are attached to the vehicle body side (not shown). Further, a bound stopper 88 is fitted on the piston rod 74.
- the bound stopper 88 is a cylindrical elastic body made of foamed urethane or the like, and has an upper end fitted into a cylindrical fitting 90 fixed to the outer member 82 of the upper support 78 and a lower end. Protrudes downward from the cylindrical fitting 90. Furthermore, a coil spring 92 is extrapolated to the shock absorber 72, an upper end is supported by the outer member 82 of the upper support 78, and a lower end is fixed to the cylinder 76 and a lower spring seat (not shown). It is supported by.
- a cylinder cap 94 is attached to the upper end portion of the cylinder 76.
- the cylinder cap 94 has a substantially bottomed cylindrical shape in the opposite direction, and covers the upper end portion of the cylinder 76, and a locking claw 96 that protrudes to the outer peripheral side is integrally formed at the lower end portion.
- the dust cover assembly 10 is arranged so that the dust cover 14 is externally inserted into the shock absorber 72 of the suspension mechanism 12 and covers the protruding portion of the piston rod 74 from the cylinder 76 in the shock absorber 72.
- the upper insulator 16 is attached to the outer member 82 of the upper support 78 attached to the upper end portion of the piston rod 74 so that the upper side of the dust cover 14 above the bellows cylinder portion 18 is moved by the piston rod 74. Supported.
- the latching claw 96 of the cylinder cap 94 is inserted into the circumferential groove 28 provided in the fitting cylinder part 26 of the dust cover 14 and is locked in the axial direction, whereby the bellows cylinder part in the dust cover 14.
- a lower side than 18 is attached to the cylinder 76.
- the outer member 82 of the upper support 78 also serves as an upper spring seat, and the spring receiving portion 38 of the upper insulator 16 is superimposed on the outer member 82 from below, so that the upper end portion of the coil spring 92 is Is supported by the outer member 82 via the spring receiving portion 38. Further, the spring receiving portion 38 is pressed against the outer member 82 by the elasticity of the coil spring 92, and the upper insulator 16 is attached to the outer member 82.
- the cylindrical metal fitting 90 that supports the bound stopper 88 is disposed in an inserted state with respect to the cylindrical portion 40 of the upper insulator 16, and the first and second locking protrusions 44 and 46 of the cylindrical portion 40 are arranged. It protrudes toward the tubular metal fitting 90, and the fitting portion between the tubular portion 40 and the engaging cylinder portion 30 is located on the outer peripheral side of the tubular metal fitting 90. Thereby, the deformation amount to the inner peripheral side of the cylindrical part 40 and the engaging cylinder part 30 is limited by the cylindrical metal fitting 90, and the cylindrical part 40 and the engaging cylinder part 30 are stably held in the fitted state. Is done.
- the cylindrical metal fitting 90 is disposed so as to be separated from the engagement cylinder portion 30 on the inner peripheral side.
- the dust cover 14 When the dust cover assembly 10 is mounted on the suspension mechanism 12, the dust cover 14 is supported by the piston rod 74 at the upper end and supported by the cylinder 76 at the lower end.
- the dust cover 14 always extends below the protruding portion of the piston rod 74 from the cylinder 76. Therefore, it is possible to effectively prevent dust and the like from entering from the lower end opening of the dust cover 14 and adhering to the protruding portion of the piston rod 74.
- the opening at the lower end of the dust cover 14 has a substantial opening area reduced by the locking claws 96 of the cylinder cap 94, so that the entry of foreign matter is more effectively prevented.
- the dust cover 14 supported at both upper and lower ends is made of resin, and sufficient durability against the tensile force is ensured. Moreover, even if the length of the bellows cylinder portion 18 is sufficiently thin by blow molding, the length of the shock absorber 72 can be reduced. Since it is possible to follow the expansion and contraction to a high degree, it is possible to avoid the bellows tube portion 18 from being damaged by the axial compressive force. In addition, since the dust cover 14 is elastically supported by the rubber upper insulator 16, the force acting on the dust cover 14 due to elastic deformation of the upper insulator 16 is reduced, and the durability of the dust cover 14 is improved. Figured.
- the shock absorber 72 contracts greatly due to a shocking large input.
- the fitting portion between the dust cover 14 and the upper insulator 16 is protected by a cylindrical metal fitting 90. Therefore, the force acting on the fitting portion between the dust cover 14 and the upper insulator 16 is reduced, and the dust cover 14 can be prevented from falling off the upper insulator 16.
- the engagement groove is configured by the first engagement groove 32 and the second engagement groove 34 that are disposed apart from each other in the engagement cylinder portion 30 of the dust cover 14.
- the engagement grooves are provided in two rows, only one row may be provided, or three or more rows that are separated from each other in the vertical direction may be provided.
- the locking protrusions provided on the upper insulator do not necessarily need to be constituted by the first locking protrusions 44 and the second locking protrusions 46, but are arranged in one row or three rows spaced apart from each other in the vertical direction. The above locking protrusions may be provided.
- the engagement groove does not necessarily have to be divided in the circumferential direction by the contact portion 36, and may be, for example, an annular concave groove that is continuous over the entire circumference.
- the locking protrusion does not necessarily have to be divided in the circumferential direction by the dividing groove 48, and may be, for example, an annular protrusion that extends over the entire circumference.
- the engaging cylinder portion 30 of the dust cover 14 and the cylindrical portion 40 of the upper insulator 16 are fitted simultaneously with the blow molding of the dust cover 14 as shown in the embodiment.
- 14 and the upper insulator 16 may be formed separately, and the engaging cylinder portion 30 of the dust cover 14 may be press-fitted or fitted into the cylindrical portion 40 of the upper insulator 16 and assembled.
- the cylindrical part 40 of the said embodiment is formed with the rubber elastic body single-piece
- the cylindrical part 40 is embedded by burying the cylindrical restraint member formed with the hard material in the cylindrical part 40, for example. It is also possible to limit the amount of deformation. According to this, the fixing force of the dust cover 14 and the upper insulator 16 can be increased, and the dust cover 14 is blow-molded without restraining the outer peripheral surface of the tubular portion 40 with the blow-molding dies 50, 50. You can also.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
- Sealing Devices (AREA)
- Diaphragms And Bellows (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
Claims (8)
- サスペンション機構のショックアブソーバに外挿される樹脂製のダストカバーが、山部と谷部が連設された蛇腹筒部を備えており、該蛇腹筒部の上下両側が該ショックアブソーバのピストンロッドとシリンダの各一方によって支持されるようになっていると共に、該ダストカバーの上端部には、該サスペンション機構におけるコイルスプリングの上端部を支持するゴム製のアッパインシュレータが取り付けられているダストカバー組立体において、
前記ダストカバーの前記蛇腹筒部の上側には係合用筒部が一体形成されて、該係合用筒部に対して外周面に開口する係合溝が周方向に延びて形成されている一方、
環状とされた前記アッパインシュレータの内周面には内周側に向かって突出する係止突部が周方向に延びて形成されており、該アッパインシュレータに対して前記ダストカバーの前記係合用筒部が内挿されていると共に、前記係合溝に対して該係止突部が差し入れられて軸方向に係止されていることを特徴とするダストカバー組立体。 - 前記係合溝には、前記係止突部が周方向で当接することによって該係止突部の該係合溝内での移動端を規定する当接部が設けられている請求項1に記載のダストカバー組立体。
- 前記係合用筒部に対して軸方向上下に離れた複数列の前記係合溝が形成されていると共に、前記アッパインシュレータに対して軸方向上下に離れた複数列の前記係止突部が形成されている請求項1又は2に記載のダストカバー組立体。
- 前記アッパインシュレータにおける前記係止突部の形成部分において、該係止突部の突出寸法(t)が、該係止突部を含んだ該アッパインシュレータの軸直角方向の最大厚さ寸法(T)に対して、T/4≦t≦3T/4の範囲で設定されている請求項1~3の何れか1項に記載のダストカバー組立体。
- 前記ダストカバーの前記係合用筒部が前記アッパインシュレータに対して該アッパインシュレータを外周側に弾性変形させた状態で嵌入されており、該アッパインシュレータが該係合用筒部に対して弾性的に密着せしめられている請求項1~4の何れか1項に記載のダストカバー組立体。
- 前記アッパインシュレータには前記ショックアブソーバに取り付けられた筒状金具が内挿配置されるようになっており、該アッパインシュレータの前記係止突部が該筒状金具の外周側に位置するように形成されている請求項1~5の何れか1項に記載のダストカバー組立体。
- 前記アッパインシュレータの内周側に前記ダストカバーの前記係合用筒部がブロー成形されて、該係合用筒部の成形時に、該係合用筒部が該アッパインシュレータの内周面に嵌合されると共に、前記係合溝に対して該係止突部が軸方向に係止されている請求項1~6の何れか1項に記載のダストカバー組立体。
- 前記アッパインシュレータは、前記ダストカバーのブロー成形時に該ダストカバーのブロー成形型と該ダストカバーの形成材料であるパリソンとの間に挟まれる保護片を備えていると共に、該ダストカバーの成形後に該保護片が切除されている請求項7に記載のダストカバー組立体。
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CN201480001849.9A CN104487731B (zh) | 2013-03-22 | 2014-03-03 | 防尘罩组合体 |
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US9611913B2 (en) | 2017-04-04 |
JP2014185658A (ja) | 2014-10-02 |
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