WO2017159822A1 - ボールジョイント、及びこれを用いたスタビリンク - Google Patents
ボールジョイント、及びこれを用いたスタビリンク Download PDFInfo
- Publication number
- WO2017159822A1 WO2017159822A1 PCT/JP2017/010788 JP2017010788W WO2017159822A1 WO 2017159822 A1 WO2017159822 A1 WO 2017159822A1 JP 2017010788 W JP2017010788 W JP 2017010788W WO 2017159822 A1 WO2017159822 A1 WO 2017159822A1
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- WIPO (PCT)
- Prior art keywords
- ball
- resin
- injection molding
- housing
- ball joint
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G7/00—Pivoted suspension arms; Accessories thereof
- B60G7/005—Ball joints
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0619—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the female part comprising a blind socket receiving the male part
- F16C11/0623—Construction or details of the socket member
- F16C11/0628—Construction or details of the socket member with linings
- F16C11/0633—Construction or details of the socket member with linings the linings being made of plastics
- F16C11/0638—Construction or details of the socket member with linings the linings being made of plastics characterised by geometrical details
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1671—Making multilayered or multicoloured articles with an insert
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G7/00—Pivoted suspension arms; Accessories thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/16—Arrangement of linkage connections
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0619—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the female part comprising a blind socket receiving the male part
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0619—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the female part comprising a blind socket receiving the male part
- F16C11/0623—Construction or details of the socket member
- F16C11/0647—Special features relating to adjustment for wear or play; Wear indicators
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0619—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints the female part comprising a blind socket receiving the male part
- F16C11/0623—Construction or details of the socket member
- F16C11/0657—Construction or details of the socket member the socket member being mainly made of plastics
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/068—Special features relating to lubrication
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0685—Manufacture of ball-joints and parts thereof, e.g. assembly of ball-joints
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/06—Ball-joints; Other joints having more than one degree of angular freedom, i.e. universal joints
- F16C11/0695—Mounting of ball-joints, e.g. fixing them to a connecting rod
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14754—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles being in movable or releasable engagement with the coating, e.g. bearing assemblies
- B29C2045/14762—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles being in movable or releasable engagement with the coating, e.g. bearing assemblies using shrinkage
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14754—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles being in movable or releasable engagement with the coating, e.g. bearing assemblies
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- 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
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/02—Condition, form or state of moulded material or of the material to be shaped heat shrinkable
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- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0049—Heat shrinkable
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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
- B29L2031/04—Bearings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
- B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
- B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
- B60G21/055—Stabiliser bars
- B60G21/0551—Mounting means therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/10—Mounting of suspension elements
- B60G2204/12—Mounting of springs or dampers
- B60G2204/122—Mounting of torsion springs
- B60G2204/1224—End mounts of stabiliser on wheel suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
- B60G2204/416—Ball or spherical joints
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
- B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
- B60G2206/80—Manufacturing procedures
- B60G2206/81—Shaping
- B60G2206/8101—Shaping by casting
- B60G2206/81012—Shaping by casting by injection moulding
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2220/00—Shaping
- F16C2220/02—Shaping by casting
- F16C2220/06—Shaping by casting in situ casting or moulding
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/01—Parts of vehicles in general
- F16C2326/05—Vehicle suspensions, e.g. bearings, pivots or connecting rods used therein
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/20—Land vehicles
- F16C2326/24—Steering systems, e.g. steering rods or columns
Definitions
- the present invention relates to a ball joint used for a connecting portion or the like between mechanism elements, and a stabilizer link using the same.
- the vehicle is equipped with a suspension device that absorbs and reduces shock and vibration transmitted from the road surface via wheels to the vehicle body, and a stabilizer for increasing the roll rigidity of the vehicle body.
- a rod-shaped member called a stabilizer link is used in the vehicle.
- the stabilizer link includes a support bar and ball joints provided at both ends of the support bar.
- the ball joint according to Patent Document 1 includes a ball stud having a sphere portion (hereinafter referred to as “ball portion”), and a housing that is provided at both ends of the support bar and rotatably accommodates the ball portion of the ball stud. Composed. On the inner side of the housing, a resin ball sheet is provided so as to be interposed between the inner wall of the housing and the ball portion of the ball stud. The ball stud is freely tilted by sliding while the outer peripheral surface of the ball portion accommodated in the housing is in contact with the inner peripheral surface of the ball seat. In this manner, the suspension device and the stabilizer are smoothly connected by the ball joint provided in the stabilizer link.
- the main body portion of the resin ball sheet is fixed to the housing by heat caulking.
- a ball sheet (and a support bar) in which a ball portion of a ball stud is accommodated is inserted into the mold (in a housing), and a resin is injected into the mold to insert the resin into the mold.
- the housing undergoes molding shrinkage (a phenomenon in which the volume of resin injected into the mold shrinks after cooling), and the housing tightens the ball portion of the ball stud (via the ball seat).
- molding shrinkage a phenomenon in which the volume of resin injected into the mold shrinks after cooling
- the present invention was devised in view of the above circumstances, and a ball sheet is formed by insert injection molding in which a resin is injected into a mold in a state where the ball sheet containing the ball portion of the ball stud is inserted into the mold. Even if it is a case where it provides in a housing, it aims at provision of a ball joint which can manage appropriately torque concerning sliding of a ball part to a housing, and a stabilizer link using the same.
- a ball joint according to the present invention (1) has a ball stud having one end fastened to a structure and a ball portion at the other end, and rotatably supports the ball portion of the ball stud.
- a ball joint comprising: a housing; and a ball seat provided so as to be interposed between the housing and the ball portion and having a housing portion for the ball portion, wherein the ball seat is a first mold It is formed by injection molding in which a thermoplastic first resin is injected therein, and the ball portion is inserted into the second mold in the state where the ball seat is accommodated in the accommodation portion.
- the inner diameter dimension of the accommodating portion formed in the seat is determined by the molding shrinkage allowance of the first resin after the injection molding and the insert temperature / injection pressure of the second resin at the time of the insert injection molding.
- the main feature is that the second resin after injection molding is set to have a size that is large enough to allow for the molding shrinkage allowance.
- the inner diameter of the housing portion formed on the ball sheet by injection molding is the molding shrinkage allowance of the first resin after injection molding, and the second resin at the time of insert injection molding. Since the size of the second resin after the insert injection molding by the injection temperature and the injection pressure is set to a size that allows for the molding shrinkage allowance, the first resin molding shrinkage after the injection molding, Even if the inner diameter of the housing portion of the ball sheet is shrunk due to molding shrinkage of the second resin after insert injection molding due to the injection temperature / injection pressure of resin 2, the inner peripheral surface of the housing portion and the outer peripheral surface of the ball portion The torque generated between the two can be properly maintained.
- the ball sheet is inserted into the housing by insert injection molding in which a resin is injected into the mold while the ball sheet containing the ball portion of the ball stud is inserted into the mold. Even if it is provided, the torque related to the sliding of the ball portion relative to the housing can be appropriately managed.
- the ball joint according to the present invention (2) is the ball joint according to (1), wherein the first resin to be the ball sheet formed by the injection molding is the one at the time of the insert injection molding.
- a material having a melting characteristic capable of withstanding the effect of the injection temperature / injection pressure of the second resin is selected.
- the first resin to be a ball sheet formed by injection molding has a melting characteristic that can withstand the effects of the injection temperature and injection pressure of the second resin at the time of insert injection molding. Therefore, even if the injection temperature / injection pressure of the second resin acts on the ball seat, softening of the ball seat is suppressed, and the inner peripheral surface of the housing portion and the outer periphery of the ball portion are selected. The torque generated between the two surfaces can be properly maintained.
- the torque related to the sliding of the ball portion with respect to the housing can be more appropriately managed as compared with the ball joint according to the present invention (1).
- the ball joint according to the present invention (3) is the ball joint according to (1) or (2), wherein the ball seat includes at least a majority region including a region extending from a top portion to an equator portion of the ball portion. And a flange portion is formed over a region including the peripheral edge portion of the opening, and an inner diameter dimension of the peripheral edge portion of the opening is set to be smaller than a maximum outer diameter dimension of the ball portion. The diameter dimension is set to be larger than the maximum outer diameter dimension of the ball portion, and the peripheral edge on the top side of the ball portion of the flange portion covers at least the equator portion of the ball seat. It extends so that it may hang down to a position.
- the ball seat covers at least a majority region including a region extending from the top portion to the equator portion of the ball portion, and the opening peripheral portion of the ball seat overhangs with respect to the ball portion.
- the peripheral edge on the top side of the ball portion of the flange portion extends so as to hang down at least to a position covering the equator portion of the ball seat, so that the ball seat is The periphery of the ball portion can be securely wrapped and held.
- the ball portion in addition to the effects of the ball joint according to (1) or (2), the ball portion can be smoothly slid with respect to the housing via the ball seat. it can.
- a ball joint according to the present invention (4) is the ball joint according to any one of (1) to (3), and is an inner peripheral surface of the housing portion of the ball seat that faces the ball portion. Is characterized in that a groove portion extending along the longitude line of the ball portion is engraved.
- a groove portion extending along the longitude line of the ball portion is engraved on the inner peripheral surface of the ball seat housing portion facing the ball portion.
- the sliding of the ball portion through the ball seat with respect to the housing can be performed more smoothly than the ball joint according to the present invention (3).
- the ball joint according to the present invention (5) is the ball joint according to (4), wherein a lubricant is provided on an inner bottom portion of the accommodation portion of the ball seat that faces the top portion of the ball portion. It is characterized in that there is provided a lubricant chamber composed of a concave portion capable of accommodating the.
- the inner bottom portion facing the top portion of the ball portion of the ball seat housing portion is provided with a lubricant chamber composed of a recess capable of accommodating a lubricant,
- the lubricant filled in the groove can be stored in the lubricant chamber, and the groove can be replenished with lubricant as necessary.
- the ball joint according to the present invention (6) is the ball joint according to (5), wherein a bulging portion that can contact the top portion of the ball portion is provided in the vicinity of the central portion of the lubricant chamber. Is provided.
- the bulging portion capable of contacting the top portion related to the ball portion is provided in the vicinity of the central portion of the lubricant chamber, the top portion related to the ball portion is the bulging portion.
- the stabilizer link according to the present invention (7) is a stabilizer link that is provided in a vehicle including a suspension device and a stabilizer and connects the suspension device and the stabilizer, and is at least one of longitudinal directions of the rod-shaped support bar.
- the ball joint according to any one of (1) to (6) is provided at the end of the lens.
- the stabilizer link according to the present invention (7), it is possible to realize a stabilizer link that exhibits the operational effects of the ball joint according to any one of (1) to (6).
- the ball sheet is provided in the housing by insert injection molding in which a resin is injected into the mold in a state where the ball sheet containing the ball portion of the ball stud is inserted into the mold.
- the torque relating to the sliding of the ball portion with respect to the housing can be appropriately managed.
- FIG. 1 is a perspective view illustrating a state in which a stabilizer link 11 according to an embodiment of the present invention is attached to a vehicle.
- Wheels W are attached to a vehicle body (both not shown) via a suspension device 15 as shown in FIG.
- the suspension device 15 includes a coil spring 15a and a damper 15b.
- the left and right suspension devices 15 are connected via a stabilizer 17 made of a substantially U-shaped spring steel rod or the like.
- the stabilizer 17 is bent from the torsion bar 17a extending between the left and right wheels W and from both ends of the torsion bar 17a. And a pair of arm portions 17b extending.
- the suspension device 15 and the stabilizer 17 correspond to the “structure” of the present invention.
- the stabilizer 17 and the damper 15 b that supports the wheel W are connected via a stabilizer link 11.
- the connection is the same on the left and right wheels W side.
- the stabilizer link 11 is configured by providing ball joints 13 at both ends of a rod-like support bar 11 a made of, for example, a steel pipe.
- the front end 1a1 of the support bar 11a is plastically deformed into a flat plate shape by pressing.
- the stabilizer link 11 is in a state where the support bar 11a and the ball stud 21 are inserted into predetermined positions in the mold (corresponding to the “second mold” of the present invention).
- the resin to be the housing 23 (corresponding to the “second resin” of the present invention) is manufactured by an insert injection molding process in which the resin is injected into the mold.
- insert injection molding process in which the resin is injected into the mold.
- one ball joint 13 is fastened and fixed to the tip of the arm 17b of the stabilizer 17, and the other ball joint 13 is fastened and fixed to the bracket 15c of the damper 15b.
- the configuration of the pair of ball joints 13 is the same.
- FIG. 2 is a longitudinal sectional view of the ball joint 13 according to the embodiment of the present invention.
- FIG. 3 is an external view showing a state in which the ball seat 25 is mounted on the ball portion 21 b of the ball stud 21 together with a cross section of the ball seat 25.
- the ball joint 13 includes a ball stud 21 made of metal such as steel and a housing 23 made of resin.
- the ball stud 21 has a stud portion 21a at one end portion and a spherical ball portion 21b at the other end portion.
- the stud portion 21a and the ball portion 21b are joined by welding.
- the stud portion 21a and the ball portion 21b may be integrally formed.
- the housing 23 is provided at both ends of the support bar 11a, and is configured to rotatably support the ball portion 21b of the ball stud 21.
- a large collar part 21a1 and a small collar part 21a2 are formed on the stud part 21a of the ball stud 21 so as to be separated from each other.
- a circular recess 21a3 is formed between the large collar part 21a1 and the small collar part 21a2.
- a male screw portion 21a4 is screwed to the stud portion 21a on the tip side of the large collar portion 21a1 (the side opposite to the ball portion 21b of the ball stud 21).
- a circular dust cover 27 made of an elastic material such as rubber is mounted between the upper end portion of the housing 23 and the circular recess 21a3 of the stud portion 21a so as to cover these gaps.
- the dust cover 27 plays a role of preventing rainwater, dust and the like from entering the ball joint 13.
- a hemispherical recess 23a is formed in the inner bottom portion of the housing 23 as shown in FIGS.
- An annular convex flange 23 b is formed on the upper portion of the housing 23.
- the convex flange 23 b has a conical surface-shaped tapered portion 23 b 1 that extends outwardly in contact with the opening peripheral edge 25 a of the ball seat 25.
- the inclination angle of the tapered portion 23b1 with respect to the axis C is set to an appropriate value according to the swing angle of the ball stud 21, the shaft diameter, and the like.
- the resin material of the housing 23 (corresponding to the “second resin” of the present invention) has thermoplasticity (because it is formed by injection molding), satisfies a predetermined strength requirement, etc.
- thermoplasticity because it is formed by injection molding
- PA66-GF30 PA66 containing glass fiber with a weight ratio of 30 to 50% / melting point: about 270 degrees Celsius
- PA66-GF30 PA66 containing glass fiber with a weight ratio of 30 to 50% / melting point: about 270 degrees Celsius
- engineering plastics such as PEEK (polyetheretherketone), PA66 (Polyamide 66), PPS (Poly Phenylene Sulfide Resin), POM (polyoxymethylene), super engineering plastic, FRP ( A material such as Fiber Reinforced Plastics (fiber reinforced plastic), GRP (glass reinforced plastic), CFRP (Carbon Reinforced Plastics) may be used as appropriate.
- PEEK polyetheretherketone
- PA66 Polyamide 66
- PPS Poly Phenylene Sulfide Resin
- POM polyoxymethylene
- FRP A material such as Fiber Reinforced Plastics (fiber reinforced plastic), GRP (glass reinforced plastic), CFRP (Carbon Reinforced Plastics) may be used as appropriate.
- a resin ball seat 25 is provided between the ball portion 21b of the ball stud 21 and the hemispherical recess 23a of the housing 23, as shown in FIGS. 2 and 3, a resin ball seat 25 is provided.
- the resin ball sheet 25 is manufactured by a single injection molding process. This will be described in detail later.
- FIG. 4A is an external view showing a state in which the ball seat 25 is mounted on the ball portion 21 b of the ball stud 21.
- FIG. 4B is an external view of the ball seat 25 as viewed from the bottom 25b side.
- 4C is an enlarged cross-sectional view around the lubricant chamber provided in the bottom 25b of the ball seat 25.
- the ball seat 25 includes an inner sphere portion 25c formed by a spherical inner peripheral surface that covers a majority region of the spherical outer peripheral surface of the ball portion 21b of the ball stud 21.
- the inner ball portion 25c corresponds to the “ball portion housing portion” of the present invention.
- the ball joint 13 having the ball stud 21 with the ball seat 25 mounted on the ball portion 21b is inserted into the mold. Done. That is, the ball seat 25 is also exposed to the injection temperature / injection pressure of the second resin to be the housing 23 used in the insert injection molding process. In this case, the ball sheet 25 is softened by being exposed to the injection temperature / injection pressure of the second resin, and the ball portion 21b slides relative to the housing 23 due to deformation / collapse of the ball sheet 25 accompanying the softening. There is a concern that the torque related to the above cannot be properly managed.
- the inner sphere diameter (corresponding to the “inner diameter dimension of the accommodating portion” of the present invention) related to the inner sphere portion (accommodating portion) 25c of the ball seat 25 is injected. Allowance for molding shrinkage allowance of the first resin after molding and molding shrinkage allowance of the second resin after insert injection molding due to the injection temperature / injection pressure of the second resin that becomes the housing 23 at the time of insert injection molding It was decided to adopt a configuration that was set to a larger dimension.
- the inner ball portion of the ball sheet 25 (by molding shrinkage of the first resin after injection molding and molding shrinkage of the second resin after insert injection molding due to the injection temperature / injection pressure of the second resin) Even if the inner sphere diameter related to the (accommodating portion) 25c shrinks, the torque generated between the inner peripheral surface of the inner sphere portion (accommodating portion) 25c and the outer peripheral surface of the ball portion 21b can be properly maintained.
- a plurality of groove portions 25c1 extending along the longitude line are formed in the inner ball portion (accommodating portion) 25c of the ball seat 25.
- the plurality of grooves 25c1 are filled with a lubricant such as grease in order to reduce the frictional force generated between the spherical outer peripheral surface of the ball portion 21b and the inner sphere portion (accommodating portion) 25c of the ball seat 25.
- the plurality of groove portions 25c1 are provided at equal intervals in the equator portion 21c related to the ball portion 21b. In the example shown in FIG. 4A, eight grooves 25c1 are provided for convenience.
- the equator portion 21c related to the ball portion 21b refers to a circular portion where the ball portion 21b has a maximum diameter around the axis C of the ball stud 21.
- the dimension of the groove 25c1 is not particularly limited, but is preferably set to, for example, a width of 0.3 mm or less and a depth of 0.3 mm or less in consideration of reducing the degree of crushing.
- the inner bottom portion facing the top portion 21b1 related to the ball portion 21b is formed of a recess capable of accommodating a lubricant as shown in FIG. 4A.
- a lubricant chamber 25c2 is provided.
- a bulging portion 25b1 that can come into contact with the top portion 21b1 of the ball portion 21b is provided.
- the lubricant filled in the plurality of grooves 25c1 can be stored in the lubricant chamber 25c2, and the plurality of grooves 25c1 can be replenished as necessary.
- the bulging portion 25b1 provided on the inner bottom portion of the ball seat 25 and the top portion 21b1 related to the ball portion 21b are always in contact with each other. Even when the phenomenon occurs, it is possible to expect the effect of preventing the collapse of the collapse phenomenon by firmly receiving the force acting in the axial direction of the ball stud 21.
- the ball seat 25 is formed with a flange portion 25e over a region including the opening peripheral edge portion 25a.
- the maximum outer diameter dimension of the flange portion 25e is set to be larger than the maximum outer diameter dimension of the ball portion 21b.
- the maximum outer diameter dimension of the flange portion 25e is set to a dimension obtained by adding a predetermined dimension (for example, about 2 to 4 mm) to the maximum outer diameter dimension (spherical diameter) of the ball portion 21b.
- the flange portion 25e forcibly removes the spherical portion 31b (see FIG. 5C) of the male die 31 from the accommodation space (having an overhanging portion) of the ball portion 21b in the ball seat 25 after manufacture by the injection molding process. It plays the role of a receiving part that receives the pulling force applied at the time.
- the peripheral edge 25e1 on the side of the top portion 21b1 related to the ball portion 21b of the flange portion 25e extends from the opening peripheral portion 25a so as to hang down to a position covering at least the equator portion 21c related to the ball portion 21b.
- the inner diameter dimension of the opening peripheral edge portion 25a of the ball seat 25 is set to be smaller than the maximum outer diameter dimension of the ball portion 21b.
- the inner diameter dimension of the opening peripheral edge portion 25a is set to a value obtained by multiplying the maximum outer diameter dimension (spherical diameter) of the ball portion 21b by a predetermined coefficient (0.90 to 0.98).
- the opening peripheral edge portion 25a of the ball seat 25 is configured to overhang the ball portion 21b. Thereby, the ball seat 25 can firmly wrap around the ball portion 21b of the ball stud 21 and hold it.
- the thickness of the opening peripheral edge portion 25a overhanging the ball portion 21b is not particularly limited, but forcibly removing the male die 31 (see FIG. 5A, etc.) with respect to the ball sheet 25 after injection molding and forcibly inserting the ball portion 21b.
- it is set to about 0.35 to 1.0 mm.
- the resin material (corresponding to the “first resin” of the present invention) of the ball seat 25 it has thermoplasticity (because it is formed by injection molding), and satisfies a predetermined wear durability requirement, Considering that the melting point (for example, about 270 degrees Celsius) of the resin material used for the housing 23 is equal to or higher than that, for example, PBT (Poly Butylene Terephtalate / melting point: about 230 degrees Celsius), PA46 (Polyamide 46 / Melting point: about 270 degrees Celsius), PEEK (polyetheretherketone / melting point: about 340 degrees Celsius), etc. are preferably used.
- PBT Poly Butylene Terephtalate / melting point: about 230 degrees Celsius
- PA46 Polyamide 46 / Melting point: about 270 degrees Celsius
- PEEK polyetheretherketone / melting point: about 340 degrees Celsius
- the stabilizer link 11 according to the embodiment of the present invention is manufactured by the insert injection molding process. This insert injection molding process is performed in a state where the ball joint 13 having the ball stud 21 with the ball seat 25 mounted on the ball portion 21b is inserted into the mold. That is, the ball seat 25 is also exposed to the injection temperature / injection pressure of the second resin to be the housing 23 used in the insert injection molding process.
- the ball sheet 25 is softened by being exposed to the injection temperature / injection pressure of the second resin, and the ball portion 21b slides relative to the housing 23 due to deformation / collapse of the ball sheet 25 accompanying the softening.
- the torque related to the above cannot be properly managed.
- a resin material (first resin) of the ball sheet 25 a resin material exhibiting a melting point equal to or higher than the melting point (for example, about 270 degrees Celsius) of the resin material (second resin) to be the housing 23 is used. If it is adopted, it is possible to suppress deformation and crushing associated with softening of the ball seat 25.
- the resin material of the housing 23 in addition to PBT, PA46, PEEK, engineering plastics such as PA66 (Polyamide 66), PA6 (Polyamide 6), PPS (Poly Phenylene Sulfide Resin), POM (polyoxymethylene), etc., super engineering plastic , FRP (Fiber Reinforced Plastics), GRP (glass fiber reinforced plastics), CFRP (Carbon Fiber Reinforced Plastics) and the like may be used as appropriate.
- PA66 Polyamide 66
- PA6 Polyamide 6
- PPS Poly Phenylene Sulfide Resin
- POM polyoxymethylene
- super engineering plastic FRP (Fiber Reinforced Plastics), GRP (glass fiber reinforced plastics), CFRP (Carbon Fiber Reinforced Plastics) and the like may be used as appropriate.
- FRP Fiber Reinforced Plastics
- GRP glass fiber reinforced plastics
- CFRP Carbon Fiber Reinforced Plastics
- an appropriate thickness is selected from a dimensional range of 0.4 mm to 2.0 mm, for example. This is because when the thickness of the ball sheet 32 is less than 0.4 mm, the fluidity of the resin at the time of injection molding deteriorates, whereas when the thickness of the ball sheet 32 exceeds 2.0 mm (the resin material of the ball sheet 25). This is based on the fact that the movement amount of the ball stud 21 is increased, which may increase the elastic lift.
- FIG. 5A is an explanatory diagram showing the configuration of a split mold used in the manufacturing process of the ball sheet 25 by injection molding.
- FIG. 5B is an explanatory diagram illustrating a manufacturing process of the ball sheet 25 by injection molding using a split mold.
- FIG. 5C is an explanatory diagram illustrating a process of sequentially removing the female mold and the male mold from the ball sheet 25 manufactured by injection molding.
- FIG. 5D is an explanatory view showing the ball sheet 25 immediately after the male mold is removed together with the mold.
- FIG. 5E is an external view illustrating a process of mounting the ball seat 25 on the ball portion 21 b of the ball stud 21 together with a cross section of the ball seat 25.
- the split mold made of steel used in the manufacturing process of the ball sheet 25 includes a male mold 31, a female mold 33, a male mold 31 and a female mold 33 in contact with the male mold 31 and the female mold 33. And an eject plate 35 for ensuring the sealing property between the molds 33.
- the male mold 31, the female mold 33, and the eject plate 35 correspond to the “first mold” of the present invention.
- the male die 31 is configured by joining a spherical sphere 31b to one end of a cylindrical rod 31a.
- the spherical portion 31 b of the male mold 31 corresponds to the inner sphere portion (accommodating portion) 25 c of the ball seat 25.
- the outer diameter dimension (corresponding to the inner diameter dimension of the inner sphere part (accommodating part) 25c of the ball seat 25) exhibited by the spherical part 31b of the male mold 31 is the inner sphere part (accommodating part) 25c of the ball sheet 25.
- the insert shrinkage allowance of the first resin after injection molding and the injection temperature / injection pressure of the second resin during insert injection molding is set to a size that allows for the molding shrinkage allowance of the second resin after injection molding.
- a plurality of protrusions 31b1 extending from the bottom along the longitude line are provided on the outer peripheral surface of the spherical portion 31b of the male mold 31.
- the plurality of ridge portions 31b1 correspond to the plurality of groove portions 25c1 formed in the inner ball portion (accommodating portion) 25c of the ball seat 25.
- a convex portion and a concave portion 31b2 are provided at the bottom of the spherical portion 31b.
- the recesses correspond to the bulging portions 25b1 provided at the inner bottom of the ball seat 25, while the protrusions correspond to the lubricant chamber 25c2 formed of the recesses.
- the female mold 33 is configured by drilling an inner sphere portion 33b having an inner peripheral surface opposite to the outer peripheral surface of the spherical sphere portion 31b in the center of the columnar base portion 33a. ing.
- the inner ball portion 33 b of the female mold 33 corresponds to the outer peripheral surface of the ball seat 25.
- a circular step portion 33c is formed on the upper portion of the inner sphere portion 33b of the base portion 33a.
- the circumferential step portion 33c corresponds to the peripheral edge 25e1 (see FIG. 4A) of the flange portion 25e of the ball seat 25.
- an injection path 33d used for injecting the first resin to be the ball seat 25 is opened at the bottom of the inner sphere portion 33b in the base portion 33a.
- the eject plate 35 is provided with an opening 35a through which the cylindrical rod 31a of the male mold 31 can be received and inserted.
- the male mold 31, the female mold 33, and the eject plate 35 are respectively positioned at predetermined positions.
- An injection molding step of injecting the first resin to be the ball seat 25 through the injection path 33d is performed in a state where the mold is clamped using a fastening member (not shown). By this injection molding process, a molded product of the ball sheet 25 is manufactured.
- the female mold 33 is removed downward (see the arrow in FIG. 5C) from the ball sheet 25 manufactured by the injection molding process, and then the inner ball portion ( A step of forcibly removing the spherical portion 31b of the male mold 31 from the housing portion) 25c (having an overhanged portion) is performed.
- the ball sheet 25 is formed by the opening peripheral edge 35a1 of the eject plate 35 as shown in FIG. 5C.
- the male die 31 is forcibly removed by applying a pulling force upward (see the arrow in FIG. 5C).
- the opening peripheral edge 35a1 of the eject plate 35 is outside on the basis of the portion corresponding to the maximum outer diameter of the spherical portion 31b of the male die 31 (the spherical diameter of the spherical portion 31b) in the upper end portion of the flange portion 25e. Located on the side.
- the opening peripheral edge 35a1 of the eject plate 35 is located on the inner side with reference to the portion corresponding to the maximum outer diameter of the spherical portion 31b of the male mold 31 in the upper end portion of the flange portion 25e,
- the outer peripheral portion of the ball portion 31b of the male die 31 interferes with the opening peripheral edge 35a1, This is because it is not possible to perform unreasonableness.
- FIG. 5D shows a molded product of the ball sheet 25 together with the eject plate 35 immediately after the spherical portion 31b of the male mold 31 is forcibly removed from the inner ball portion (accommodating portion) 25c of the ball sheet 25. Thereafter, the eject plate 35 is removed.
- a force that pushes the ball portion 21 b of the ball stud 21 toward the inner ball portion (accommodating portion) 25 c of the ball seat 25 is applied to perform a mounting step of mounting the ball seat 25 on the ball portion 21b of the ball stud 21.
- a jig 37 shown in FIG. 5E is used to support the molded product of the ball sheet 25.
- the jig 37 is configured by drilling an inner sphere portion 37 b having an inner peripheral surface opposite to the outer peripheral surface of the ball seat 25 in the center of the columnar base portion 37 a. As shown in FIG.
- the peripheral edge 25e1 of the flange portion 25e formed on the ball seat 25 is in contact with the upper end portion 37c of the base body portion 37a.
- the outer peripheral side of the flange portion 25e is not restrained by a mold member. Therefore, when a force for pushing the ball portion 21b of the ball stud 21 toward the inner ball portion (accommodating portion) 25c of the ball seat 25 is applied, the opening peripheral portion 25a of the ball seat 25 expands in the outer peripheral direction. Thus, the mounting process can be performed smoothly.
- the ball joint 13 according to the present invention (1) has one end fastened to the suspension device 15 / stabilizer 17 (structure) and the other end having a ball portion 21b, and the ball stud 21b of the ball stud 21 is rotated.
- a ball joint 13 including a housing 23 that is freely supported, and a ball seat 25 that is provided so as to be interposed between the housing 23 and the ball portion 21b and that has a housing portion (inner ball portion 25c) for the ball portion 21b.
- the ball sheet 25 is formed by single injection molding in which a first resin (which becomes the ball sheet 25) is injected into the first mold, and the ball portion 21b is formed by the inner ball portion 25c.
- a second thermoplastic which becomes the housing 23
- the inner diameter dimension of the inner sphere portion (accommodating portion) 25c provided in the housing 23 by insert injection molding for injecting fat and formed on the ball seat 25 by the injection molding is the molding shrinkage allowance of the first resin after the injection molding.
- the inner diameter of the inner ball portion (accommodating portion) 25c formed on the ball sheet 25 by injection molding is determined by the molding shrinkage allowance of the first resin after injection molding and the insert. Since the second resin is set to have a size larger than the molding shrinkage allowance of the second resin after insert injection molding due to the injection temperature and injection pressure of the second resin at the time of injection molding, Due to the molding shrinkage of the resin and the molding shrinkage of the second resin after the insert injection molding due to the injection temperature / injection pressure of the second resin, the inner diameter of the inner ball portion (accommodating portion) 25c of the ball seat 25 is shrunk. However, the torque generated between the inner peripheral surface of the inner sphere portion (accommodating portion) 25c and the outer peripheral surface of the ball portion 21b can be properly maintained.
- the resin is injected into the second mold in a state where the ball seat 25 in which the ball portion 21b of the ball stud 21 is accommodated is inserted into the second mold. Even when the ball seat 25 is provided in the housing 23 by insert injection molding, the torque related to the sliding of the ball portion 21b with respect to the housing 23 can be appropriately managed.
- the ball joint 13 according to the present invention (2) is the ball joint 13 described in (1), and the first resin that becomes the ball sheet 25 formed by injection molding is the first resin at the time of insert injection molding.
- a configuration may be adopted in which a material having a melting characteristic that can withstand the action of the injection temperature / injection pressure of the resin 2 is selected.
- the first resin that becomes the ball sheet 25 formed by injection molding is capable of withstanding the effects of the injection temperature and injection pressure of the second resin during insert injection molding. Since a material having characteristics is selected, even if the injection temperature / injection pressure of the second resin acts on the ball seat 25, the softening of the ball seat 25 is suppressed, and the inner ball portion (accommodating portion). The torque generated between the inner peripheral surface of 25c and the outer peripheral surface of the ball portion 21b can be properly maintained.
- the torque related to the sliding of the ball portion 21b with respect to the housing 23 can be more appropriately managed.
- the ball joint 13 according to the present invention (3) is the ball joint 13 according to (1) or (2), and the ball seat 25 extends from the top portion 21b1 (see FIG. 4C) related to the ball portion 21b to the equator.
- the flange portion 25e is formed over the region including the opening peripheral portion 25a, covering at least the majority region including the region extending over the portion 21c (see FIG. 4A).
- the inner diameter of the opening peripheral portion 25a is the maximum outer diameter of the ball portion 21b.
- the maximum outer diameter dimension of the flange portion 25e is set to be larger than the maximum outer diameter dimension of the ball portion 21b, and the top portion 21b1 of the flange portion 25e is related to the ball portion 21b.
- the peripheral edge 25e1 on the side adopts a structure extending so as to hang down to a position covering at least the equator portion 21c related to the ball portion 21b. Good.
- the ball seat 25 covers at least the majority region including the region extending from the top portion 21b1 to the equator portion 21c related to the ball portion 21b, and the opening peripheral edge portion 25a of the ball seat 25 is It is comprised so that it may overhang with respect to the ball
- the ball sheet 25 can firmly wrap around the ball portion 21b of the ball stud 21 and hold it.
- the sliding of the ball portion 21b with respect to the housing 23 via the ball seat 25 is smoothly performed. Can be done.
- a ball joint 13 according to the present invention (4) is the ball joint 13 according to any one of (1) to (3), and the ball portion of the inner ball portion (accommodating portion) 25c of the ball seat 25 is a ball portion.
- bowl part is engraved in the internal peripheral surface facing 21b.
- the groove portion 25c1 extending along the longitude line of the ball portion 21b is formed on the inner peripheral surface of the inner ball portion (accommodating portion) 25c of the ball seat 25 facing the ball portion 21b. Since the groove portion 25c1 is filled with a lubricant such as grease, the ball portion 21b can be smoothly slid relative to the housing 23 via the ball seat 25.
- the sliding of the ball portion 21b through the ball seat 25 with respect to the housing 23 can be performed more smoothly than the ball joint 13 according to the present invention (3). Can do.
- the ball joint 13 according to the present invention (5) is the ball joint 13 according to (4), and is opposed to the top portion 21b1 related to the ball portion 21b in the inner ball portion (accommodating portion) 25c of the ball seat 25.
- the inner bottom portion may be provided with a lubricant chamber 25c2 formed of a recess capable of accommodating the lubricant.
- a lubricant chamber 25c2 formed of a recess capable of accommodating a lubricant is provided in an inner bottom portion of the inner ball portion 25c of the ball seat 25 that faces the top portion 21b1 of the ball portion 21b. Therefore, the lubricant filled in the groove 25c1 can be stored in the lubricant chamber 25c2, and the groove 25c1 can be replenished with lubricant as necessary.
- the sliding of the ball portion 21b through the ball seat 25 with respect to the housing 23 is performed more smoothly than the ball joint 13 according to the present invention (4).
- the effect can be expected.
- the ball joint 13 according to the present invention (6) is the ball joint 13 according to (5), and can be brought into contact with the top portion 21b1 related to the ball portion 21b in the vicinity of the center portion of the lubricant chamber 25c2.
- a configuration in which the bulging portion 25b1 is provided may be employed.
- the bulging portion 25c1 that can come into contact with the top portion 21b1 of the ball portion 21b is provided in the vicinity of the center portion of the lubricant chamber 25c2.
- the ball portion 21b slides more smoothly with respect to the housing 23 via the ball seat 25 than the ball joint 13 according to the present invention (5).
- the effect can be expected.
- the stabilizer link 11 according to the present invention (7) is provided in a vehicle including the suspension device 15 and the stabilizer 17, and is the stabilizer link 11 that connects the suspension device 15 and the stabilizer 17.
- a configuration may be adopted in which the ball joint 13 described in any one of (1) to (6) is provided at at least one end in the direction.
- the stabilizer link 11 according to the present invention (7), it is possible to realize the stabilizer link 11 having the operational effect by the ball joint 13 according to any one of (1) to (6).
- the ball joint 13 according to the present invention has been described with reference to an example in which the ball joint 13 is applied to a vehicle stabilizer link 11, the present invention is not limited to this example.
- the ball joint 13 according to the present invention can be widely applied to a joint portion of an arm included in an industrial robot, a structure of a joint portion of an arm included in an industrial vehicle such as a shovel car or a crane vehicle, and the like.
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Abstract
Description
ここで、仮に、ボールスタッドのボール部が収容されたボールシート(及びサポートバー)を金型内にインサートした状態で(ハウジングとなる)樹脂を金型内に注入するインサート射出成形によって、ボールシートをハウジングに固定したとする。こうしたケースでは、インサート射出成形後において、ハウジングが成形収縮(金型に注入した樹脂の体積が冷却後に縮む現象)を起こして、ハウジングが(ボールシートを介して)ボールスタッドのボール部を締め付ける。その結果、ハウジングに対するボール部の摺動に係るトルクを適切に管理することが困難になるおそれがあった。
本発明の実施形態に係るボールジョイント13を用いたスタビリンク11について、車両に取付けた例をあげて説明する。図1は、本発明の実施形態に係るスタビリンク11の車両への取り付け状態を表す斜視図である。
次に、本発明の実施形態に係るボールジョイント13について、図2~図3を参照して説明する。図2は、本発明の実施形態に係るボールジョイント13の縦断面図である。図3は、ボールスタッド21のボール部21bにボールシート25が装着された状態を、ボールシート25の断面と共に表す外観図である。
次に、ボールシート25の詳細構造について、図4A~図4Cを参照して説明する。図4Aは、ボールスタッド21のボール部21bにボールシート25を装着した状態を表す外観図である。図4Bは、ボールシート25を底部25bの側から観た外観図である。図4Cは、ボールシート25の底部25bに設けた潤滑剤室周辺の拡大断面図である。
これにより、仮に、射出成形後の第1の樹脂の成形収縮、及び第2の樹脂の射出温度・射出圧力によるインサート射出成形後の第2の樹脂の成形収縮によってボールシート25の内球部(収容部)25cに係る内球径が収縮したとしても、内球部(収容部)25cの内周面とボール部21bの外周面との間に生じるトルクを適正に維持することができる。
複数の溝部25c1は、ボール部21bに係る赤道部21cにおいてそれぞれが相互に等しい間隔をおいて設けられている。図4Aに示す例では、都合8本の溝部25c1が設けられている。なお、ボール部21bに係る赤道部21cとは、ボールスタッド21の軸線C周りでボール部21bが最大径をなす周回状の部分をいう。溝部25c1の寸法は、特に限定されないが、圧壊の程度を軽減することを考慮して、例えば、幅0.3mm以下、深さ0.3mm以下とするのが好ましい。
また、ボールジョイント13の通常動作時において、ボールシート25の内底部に設けた膨出部25b1と、ボール部21bに係る頂部21b1とが常時当接しているため、仮に、ボールシート25周りに圧壊現象が生じた場合であっても、ボールスタッド21の軸方向に作用する力をしっかりと受け止めることで、圧壊現象の拡散を防止する効果を期待することができる。
ボールシート25となる樹脂素材として、ハウジング23となる樹脂素材の融点と同等又はそれ以上の融点を呈する樹脂素材を選定する理由は、ボールシート25の軟化に伴う変形・潰れを抑止することができるからである。すなわち、本発明の実施形態に係るスタビリンク11は、前記インサート射出成形工程によって製造される。
このインサート射出成形工程は、ボール部21bにボールシート25を装着した状態のボールスタッド21を有するボールジョイント13を、金型内にインサートした状態で行われる。つまり、インサート射出成形工程に用いるハウジング23となる第2の樹脂の射出温度・射出圧力に、ボールシート25も曝されることになる。この場合において、第2の樹脂の射出温度・射出圧力に曝されることでボールシート25の軟化が生じ、この軟化に伴うボールシート25の変形・潰れによって、ハウジング23に対するボール部21bの摺動に係るトルクを適切に管理することができない事態が懸念される。
この点、ボールシート25の樹脂素材(第1の樹脂)として、ハウジング23となる樹脂素材(第2の樹脂)の融点(例えば摂氏270度程度)と同等又はそれ以上の融点を呈する樹脂素材を採用すれば、ボールシート25の軟化に伴う変形・潰れを抑止することができる。
次に、ボールシート25の製造工程について、図5A~図5Eを参照して説明する。図5Aは、射出成形によるボールシート25の製造工程に用いる割り金型の構成を表す説明図である。図5Bは、割り金型を用いた射出成形によるボールシート25の製造工程を表す説明図である。図5Cは、射出成形により製造されたボールシート25から雌型、雄型を順次外す工程を表す説明図である。図5Dは、雄型を外した直後のボールシート25を、金型と共に表す説明図である。図5Eは、ボールスタッド21のボール部21bにボールシート25を装着する工程をボールシート25の断面と共に表す外観図である。
ボールシート25の製造工程に用いられる、鋼材からなる割り金型は、図5Aに示すように、雄型31と、雌型33と、雄型31及び雌型33に接して雄型31及び雌型33間のシール性を担保するためのイジェクトプレート35と、からなる。雄型31、雌型33、及びイジェクトプレート35は、本発明の「第1の金型」に相当する。
次に、本発明の実施形態に係るボールジョイント13が奏する作用効果について説明する。
本発明(1)に係るボールジョイント13は、一端が懸架装置15・スタビライザ17(構造体)に締結され他端にボール部21bを有するボールスタッド21と、ボールスタッド21のボール部21bを回動自在に支持するハウジング23と、ハウジング23とボール部21bとの間に介在するように設けられ、ボール部21bの収容部(内球部25c)を有するボールシート25と、を備えるボールジョイント13であって、ボールシート25は、第1の金型内に熱可塑性の(ボールシート25となる)第1の樹脂を注入する単独の射出成形によって形成されると共に、ボール部21bが内球部25cに収容されたボールシート25を第2の金型内にインサートした状態で当該第2の金型内に熱可塑性の(ハウジング23となる)第2の樹脂を注入するインサート射出成形によってハウジング23に設けられ、前記射出成形によってボールシート25に形成される内球部(収容部)25cの内径寸法は、射出成形後の第1の樹脂の成形収縮代、及び前記インサート射出成形時における第2の樹脂の射出温度・射出圧力によるインサート射出成形後の第2の樹脂の成形収縮代を見越した分だけ大きい寸法に設定されている。
以上説明した複数の実施形態は、本発明の具現化の例を示したものである。したがって、これらによって本発明の技術的範囲が限定的に解釈されることがあってはならない。本発明はその要旨又はその主要な特徴から逸脱することなく、様々な形態で実施することができるからである。
13 ボールジョイント
15 懸架装置(構造体)
17 スタビライザ(構造体)
21 ボールスタッド
21b ボール部
21c 赤道部
23 ハウジング
25 ボールシート
25c 内球部(ボール部の収容部)
25e フランジ部
Claims (7)
- 一端が構造体に締結され他端にボール部を有するボールスタッドと、
前記ボールスタッドの前記ボール部を回動自在に支持するハウジングと、
前記ハウジングと前記ボール部との間に介在するように設けられ、当該ボール部の収容部を有するボールシートと、を備えるボールジョイントであって、
前記ボールシートは、
第1の金型内に熱可塑性の第1の樹脂を注入する射出成形によって形成されると共に、前記ボール部が前記収容部に収容された当該ボールシートを第2の金型内にインサートした状態で当該第2の金型内に前記ハウジングとなる熱可塑性の第2の樹脂を注入するインサート射出成形によって前記ハウジングに設けられ、
前記射出成形によって前記ボールシートに形成される前記収容部の内径寸法は、当該射出成形後の前記第1の樹脂の成形収縮代、及び前記インサート射出成形時における前記第2の樹脂の射出温度・射出圧力による当該インサート射出成形後の前記第2の樹脂の成形収縮代を見越した分だけ大きい寸法に設定されている
ことを特徴とするボールジョイント。 - 請求項1に記載のボールジョイントであって、
前記射出成形によって形成される前記ボールシートとなる前記第1の樹脂は、前記インサート射出成形時における前記第2の樹脂の射出温度・射出圧力による作用に耐え得る溶融特性を有する材質が選定されている
ことを特徴とするボールジョイント。 - 請求項1に記載のボールジョイントであって、
前記ボールシートは、前記ボール部に係る頂部から赤道部にわたる領域を含む少なくとも過半領域を覆っており、開口周縁部を含む領域にわたりフランジ部が形成され、
前記開口周縁部の内径寸法は、前記ボール部の最大外径寸法と比べて小さい寸法に設定され、
前記フランジ部の最大外径寸法は、前記ボール部の最大外径寸法と比べて大きい寸法に設定され、
前記フランジ部のうち前記ボール部に係る頂部の側の周端縁は、少なくとも前記ボールシートに係る赤道部を覆う位置まで垂下するように延出している
ことを特徴とするボールジョイント。 - 請求項1に記載のボールジョイントであって、
前記ボールシートの前記収容部のうち前記ボール部に対向する内周面には、前記ボール部の経度線に沿って延びる溝部が刻設されている
ことを特徴とするボールジョイント。 - 請求項4に記載のボールジョイントであって、
前記ボールシートの前記収容部のうち前記ボール部に係る頂部に対向する内底部には、潤滑剤を収容可能な凹部からなる潤滑剤室が設けられている
ことを特徴とするボールジョイント。 - 請求項5に記載のボールジョイントであって、
前記潤滑剤室の中央部付近には、前記ボール部に係る頂部に当接可能な膨出部が設けられている
ことを特徴とするボールジョイント。 - 懸架装置及びスタビライザを備える車両に設けられ、前記懸架装置及び前記スタビライザを連結するスタビリンクであって、
棒状のサポートバーの長手方向の少なくともいずれかの端部に、請求項1~請求項6のいずれか一項に記載のボールジョイントを設けて構成される
ことを特徴とするスタビリンク。
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EP17766817.5A EP3431787A4 (en) | 2016-03-17 | 2017-03-16 | BALL JOINT AND STABILIZER CONNECTION THEREWITH |
CN201780012350.1A CN108700106A (zh) | 2016-03-17 | 2017-03-16 | 球窝接头及使用其的稳定器连杆 |
US16/084,555 US10836228B2 (en) | 2016-03-17 | 2017-03-16 | Ball joint, and stabilizer link using same |
MX2018011174A MX2018011174A (es) | 2016-03-17 | 2017-03-16 | Junta de rotula y enlace estabilizador utilizando la misma. |
KR1020187026390A KR102067684B1 (ko) | 2016-03-17 | 2017-03-16 | 볼 조인트 및 이것을 사용한 스태빌라이저 링크 |
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CN110594329A (zh) * | 2019-09-25 | 2019-12-20 | 博戈橡胶塑料(株洲)有限公司 | 一种带橡胶金属球铰的弹性连杆轻量化方法 |
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JP6204521B2 (ja) | 2017-09-27 |
KR20180110119A (ko) | 2018-10-08 |
CN108700106A (zh) | 2018-10-23 |
US20190077208A1 (en) | 2019-03-14 |
US10836228B2 (en) | 2020-11-17 |
KR102067684B1 (ko) | 2020-01-20 |
JP2017166619A (ja) | 2017-09-21 |
MX2018011174A (es) | 2019-01-14 |
EP3431787A4 (en) | 2019-11-06 |
EP3431787A1 (en) | 2019-01-23 |
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