WO2015056592A1 - ボールシートおよびボールジョイント - Google Patents
ボールシートおよびボールジョイント Download PDFInfo
- Publication number
- WO2015056592A1 WO2015056592A1 PCT/JP2014/076686 JP2014076686W WO2015056592A1 WO 2015056592 A1 WO2015056592 A1 WO 2015056592A1 JP 2014076686 W JP2014076686 W JP 2014076686W WO 2015056592 A1 WO2015056592 A1 WO 2015056592A1
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- WIPO (PCT)
- Prior art keywords
- ball
- groove
- stud
- shape
- ball seat
- 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
- 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
- F16C11/0619—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
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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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- 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
- 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 seat that slidably holds a spherical ball portion formed at a tip portion of a shaft-shaped stud portion, and a ball joint including the ball seat.
- a ball joint is used in a suspension mechanism (suspension device) and a steering mechanism (steering device) in a vehicle such as an automobile in order to movably connect shaft-shaped components to each other.
- the ball joint is mainly a bottomed cylinder through a ball seat (also referred to as a “bearing seat”) in which a substantially spherical ball portion formed at the tip of a shaft-like stud slidably holds the ball portion. It is housed in a socket.
- a groove for holding a lubricant for smoothly sliding the ball portion of the ball stud is formed on the inner peripheral surface of the ball seat.
- the groove portions having a square cross-sectional shape formed on the inner peripheral surface of the cylindrical ball sheet have bearing seats at four positions in the circumferential direction of the ball sheet. It extends along the axial direction.
- the present invention has been made to address the above problems, and an object of the present invention is to provide a ball seat that can be efficiently assembled with a high yield and a ball joint including the ball seat.
- the present invention is characterized in that a cylindrical holding portion that slidably accommodates a ball portion formed at a tip portion of a ball stud extending in a rod shape is pressed against the ball portion side by an inner surface of a socket.
- the ball seat is accommodated in the socket in a deformed state, and the holding portion has a first groove portion extending in a concave shape on the inner surface of at least the deforming portion, and the first groove portion is That is, the curvature of the inner surface in the cross section is formed in a shape having a finite value over the entire length.
- the cross sectional shape in the first groove portion is a cross sectional shape in a plane perpendicular to the direction in which the first groove portion extends. Further, the cross-sectional shape of the first groove portion may or may not include the boundary portion where the first groove portion opens on the inner peripheral surface of the holding portion.
- the ball seat has the first groove portion formed in the holding portion that slidably holds the ball portion of the ball stud in the cross-sectional shape.
- the surface curvature is formed in a shape having a finite value over the entire first groove.
- the ball seat does not have a portion having an infinite curvature in the cross-sectional shape of the first groove portion, for example, a corner portion including a right angle, an acute angle, an obtuse angle, etc. (including other sharp points).
- the holding part is deformed in the socket, it is possible to avoid the load from being concentrated on specific portions such as the corners, and it is possible to suppress the occurrence of overload and damage due to the stress concentration.
- the ball seat can simplify the assembling process of the ball joint and improve the yield and can be efficiently assembled.
- the first groove portion has a shape in which a first-order differential value of a distance between the central axis of the cylindrical holding portion and the inner surface of the first groove portion continuously changes. That is to be formed.
- the first differential value of the distance between the central axis of the holding part and the inner surface of the first groove part is continuous in the first groove part.
- the first differential value of the distance between the central axis of the holding portion and the inner surface of the first groove portion is discontinuous. It is possible to prevent overload and damage due to stress concentration in the first groove portion having a shape excluding the shape.
- the groove width inside the first groove portion is the inside of the holding portion in the first groove portion.
- a so-called undercut shape also referred to as “ant groove” wider than the opening width on the surface, or a part of the inner surface of the first groove part perpendicular to the inner surface of the holding part, in other words, for example, there exists a shape which has a part parallel to the virtual straight line extended from the central axis of a holding
- the first groove portion is formed at a depth of 40% or more and 50% or less of the thickness of the holding portion.
- the ball sheet is formed with the first groove having a depth of 40% or more and less than 50% of the thickness of the holding portion.
- the first groove portion can be formed in a state where the strength of the holding portion is ensured.
- the depth of the 1st groove part in a ball seat is the range which is 40% or more and less than 50% in the suitable range, and does not deny that it comprises with the depth outside this range.
- Another feature of the present invention is that, in the ball sheet, the opening width of the first groove portion on the inner surface of the holding portion is larger than the thickness of the holding portion.
- the ball seat has an amount of lubricant retained in the first groove portion because the opening width of the first groove portion on the inner peripheral surface of the holding portion is wider than the thickness of the holding portion.
- the depth can be reduced and the lubrication performance can be satisfactorily maintained while maintaining the resistance, and the curvature of the inner surface shape in the first groove can be increased, so that overload and damage due to stress concentration can be more effectively prevented. it can.
- the opening width at which the first groove portion opens on the inner peripheral surface of the holding portion may be formed smaller (narrower) than the thickness of the holding portion.
- the holding portion in the ball seat, includes a second groove portion extending in a concave shape on an inner surface of a portion that receives a load in the axial direction of the ball stud from the ball portion.
- the two groove portions are configured to have a corner portion at least at the bottom in the cross section.
- the ball seat has a second groove portion extending in a concave shape on the inner surface of the portion of the holding portion that receives the load in the axial direction of the ball stud from the ball portion.
- the second groove is formed with a corner at least at the bottom in the cross section.
- the shape of the second groove portion having a corner portion at least at the bottom in the cross section is, for example, a shape having two corner portions at both ends of the bottom portion extending in a planar shape, specifically, the cross section shape is trapezoidal. There are shapes that are square.
- the ball seat can accommodate more lubricant compared to the case where the corner of the bottom of the second groove is rounded, so that the ball seat in the holding portion receives a load in the axial direction of the ball stud.
- Lubricant supply capability can be improved, and smooth slidability of the ball portion can be ensured.
- the present invention can be implemented not only as an invention of a ball sheet, but also as an invention of a ball joint provided with this ball sheet.
- the ball stud having a spherical ball portion at the tip end portion of the shaft-shaped stud portion the above-described ball seat, and the holding portion of the ball seat are pressed against the ball portion side by the inner surface and deformed. It is good to provide the socket to accommodate. According to the ball joint configured as described above, the same effect as that of the ball seat can be expected.
- FIG. 3 is an end view of an enlarged cut portion showing a cross section of a first groove portion in the ball sheet as viewed from line BB shown in FIG. 2.
- FIG. 4 is an end view of an enlarged cut portion showing a cross section of a second groove portion in the ball sheet as seen from the line CC shown in FIG. 2.
- (A), (B) has shown the cross section of the 1st groove part at the time of forming with a corner
- (A) is It is an end view of an enlarged cut portion showing an example of a first groove formed with a corner (a portion with an infinite curvature)
- (B) is formed with a corner (a portion with an infinite curvature).
- FIG. 6 is an enlarged end view showing another example of the first groove portion. It is an expanded cut part end elevation which shows the cross section of the 1st groove part in the glue sheet which concerns on the modification of this invention.
- FIG. 1 is a longitudinal sectional view schematically showing a configuration of a ball joint 100 including a ball seat 130 according to the present invention.
- each figure referred in this specification has the part typically expressed, such as exaggerating and showing a one part component, in order to make an understanding of this invention easy. For this reason, the dimension, ratio, etc. between each component may differ.
- the ball joint 100 is a joint member that connects components to each other while allowing a change in angle between the components in a suspension mechanism (suspension device) or a steering mechanism (steering device) employed in a vehicle such as an automobile. is there.
- the ball joint 100 is mainly configured by a ball stud 110, a socket 120, a ball sheet 130, and a dust cover 140.
- the ball stud 110 is made of a steel material, and includes a ball portion 113 formed in a substantially spherical shape via a constricted portion 112 on one end side of the stud portion 111 formed in a shaft shape. Configured.
- the stud portion 111 is a portion for connecting the ball joint 100 to each component in a steering mechanism and a suspension mechanism (not shown), and is configured by forming a male screw 114 at an end opposite to the ball portion 113.
- the ball portion 113 is a portion that slides in the ball sheet 130 and is formed in a smooth spherical shape so as to slide smoothly with respect to the inner peripheral surface.
- the socket 120 is formed by casting a metal material such as a non-ferrous metal or a steel material using a casting process.
- the socket body 121 is formed in a cylindrical shape, and is formed by extending in the horizontal direction from the socket body 121 (not shown). It consists of a connecting part.
- the socket 120 is formed by forging a steel material, but other materials, for example, various alloy materials such as an aluminum material, a magnesium material, or a zinc material are formed by casting. It may be.
- the connection part which is not shown in figure is a part for connecting the ball joint 100 to each component in the steering mechanism and suspension mechanism which are not shown.
- the socket main body 121 is a part that accommodates and holds the ball portion 113 of the ball stud 110 via the ball seat 130.
- One end (the upper side in the drawing) is open and the other end (the lower side in the drawing) is the end side. It is formed in a bottomed cylindrical shape closed by a plug 124.
- the socket body 121 has a stud opening 122 through which the stud portion 111 penetrates at one end (upper side in the figure) and a plug 124 at the other end side (lower side in the figure).
- a plug fixing portion 123 that is fixed by caulking is formed and configured.
- the plug 124 is a plate-like member for closing the opening of the other end (the lower side in the figure) of the socket body 121 formed in a cylindrical shape, and is configured by forming a steel material into a disc shape.
- an accommodating portion 125 is formed inside the socket body 121.
- the accommodating portion 125 is a portion that holds the ball portion 113 via the ball sheet 130 and is formed in a cylindrical shape. More specifically, the accommodating portion 125 includes a straight portion 125a in which a portion accommodating the hemispherical portion 113a on the tip end side in the ball portion 113 is formed with a constant inner diameter, and a hemispherical portion on the stud portion 111 side in the ball portion 113.
- the portion covering 113b is configured by a taper portion 125b formed in a shape whose inner diameter is narrowed toward the inside, that is, toward the ball portion 113 side.
- the ball seat 130 is a resin part that slidably holds the ball portion 113 of the ball stud 110, and is formed in a cylindrical shape.
- the ball sheet 130 is a synthetic resin material such as polyether ether ketone resin (PEEK), polyimide resin (PI), polyacetal resin (POM), polyvinyl chloride resin (PVC), polyurethane resin (PUR), polycarbonate. It is made of resin (PC), polystyrene resin (PS), nylon resin (PA-6T, 9T), polypropylene (PP), or the like.
- the ball sheet 130 includes a stud-side holding portion 131a that covers most of the hemispherical portion 113a on the stud portion 111 side on the upper side of the ball portion 113 and a tip end side on the lower side of the ball portion 113 in the drawing. It is comprised by the holding
- the stud-side holding portion 131a is formed in a circular outer shape whose outer peripheral portion corresponds to the inner diameter of the straight portion 125a in the accommodating portion 125 of the socket body 121, and the inner surface is a hemisphere on the stud side in the ball portion 113. It is formed in a cylindrical shape having a larger inner diameter than the portion 113b.
- the thickness between the inner surface and the outer surface of the stud-side holding portion 131a is formed such that the ball sheet 130 can be deformed so as to tilt inward along the inner surface of the socket body 121.
- first groove portions 132 are formed on the inner surface of the stud side holding portion 131a from the opening at the upper end in the figure toward the tip side holding portion 131b. As shown in detail in FIG. 3, each first groove portion 132 is provided with grease 133 for supplying grease 133 as a lubricant to the sliding portion between the inner surface of the ball seat 130 and the outer surface of the ball portion 113. It is a part to hold, and is formed to be recessed from the inner surface of the stud holding part 131a.
- the 1st groove part 132 is formed only by the shape from which the curvature of the inner surface in the cross section in all the arbitrary positions over a full length becomes a finite value, ie, the curvature of an inner surface becomes an infinite value. It is formed in a shape that does not include the shape.
- the cross-sectional shape of the first groove portion 132 includes a boundary portion where the first groove portion 132 opens on the inner peripheral surface of the stud-side holding portion 131a.
- the grease 133 in each groove is omitted in order to clarify the shapes of the first groove 132 and the second groove 134 described later.
- the first groove 132 with depth D 1 is formed on 40% of the thickness of the thickness t of the stud holding portion 131a, the opening width W 1 that is open on the inner surface of the stud holder 131a Is formed so as to open larger than the thickness t of the stud-side holding portion 131a. And these six 1st groove parts 132 are equally arrange
- the distal end holding portion 131b is formed in a circular outer shape whose outer peripheral portion corresponds to the inner diameter of the straight portion 125a in the accommodating portion 125 of the socket main body 121, and the inner peripheral surface is a hemisphere on the distal end side in the ball portion 113. It is formed in a hemispherical shape corresponding to the shape of the portion 113a.
- Six second groove portions 134 are formed radially on the inner peripheral surface of the distal end side holding portion 131a from the opening at the lower end of the drawing toward the stud side holding portion 131a side. As shown in detail in FIG.
- each second groove portion 134 is a portion that holds the grease 133 for supplying the grease 133 to the sliding portion between the inner surface of the ball seat 130 and the outer surface of the ball portion 113. Yes, it is formed to be recessed from the inner surface of the tip side holding portion 131b.
- the cross-sectional shape of the inner surface in the cross-section at all arbitrary positions over the entire length is recessed in an arc shape with a cross-sectional shape from the inner surface of the tip side holding portion 131b. Thereafter, a cross-sectional shape that is bent at a substantially right angle and the bottom portion extends linearly is formed in a substantially square shape.
- the second groove 134 with depth D 2 is formed below the depth D 1 of the first groove 132, the opening width W 2 which opens on the inner surface of the tip-side holding portion 131b first groove It is formed with the same width as the opening width W 1 of 132.
- these six 2nd groove parts 134 are equally arrange
- the shape having a curvature having a finite value in the first groove portion 132 and the second groove portion 134 is not a corner portion, so that it appears directly on the drawing. Although there is no line, the boundary of the part where the curvature changes is shown with a thin line to help understanding.
- a dust cover 140 is provided on the upper portion of the socket body 121 of the socket 120 so as to cover the upper portion of the socket body 121 and the ball portion 113 of the ball stud 110 accommodated in the socket body 121.
- the dust cover 140 is made of an elastically deformable rubber material, a soft synthetic resin material, or the like, and is formed in a substantially cylindrical shape in which a central portion is expanded.
- the dust cover 140 has a stud portion 111 of the ball stud 110 inserted into one (upper side in the drawing) opening and is fixed to the lower portion of the stud portion 111 by an elastic force.
- the other opening (lower side in the figure) of the dust cover 140 is fixed by a metal circlip 141 in a state of being fitted in a recess formed on the outer peripheral portion of the socket body 121.
- the dust cover 140 prevents foreign matter from entering the ball sheet 130.
- the worker prepares a ball stud 110 and a ball seat 130, which are parts constituting the ball joint 100, respectively.
- the ball stud 110 is formed by separately forging and cutting a steel material.
- the ball sheet 130 is formed by a separate injection molding process.
- the worker assembles the ball stud 110 and the ball seat 130. Specifically, the operator inserts the ball portion 113 in the ball stud 110 from the stud side holding portion 131 a side of the holding portion 131 in the ball seat 130 and accommodates it in the holding portion 131.
- the operator prepares the socket 120 and the plug 124, respectively.
- the socket 120 is formed by separately forging steel material.
- the plug 124 is formed by separately pressing a steel material.
- the worker assembles the ball sheet 130 in which the ball portion 113 is accommodated in the socket 120 using a press working device (not shown). Specifically, the operator inserts the ball stud 110 into the socket 120 from the stud portion 111 side in a state where the plug 124 is placed on the end surface (the lower end surface in FIG. 1) of the ball seat 130 on the front end side holding portion 131b side. By inserting into the straight part 125a in the accommodating part 125, the ball seat 130 is inserted into the accommodating part 125 from the stud side holding part 131a side. In this case, the operator fills an appropriate amount of grease 133 in the opening of the tip side holding portion 131b of the ball seat 130 when the plug 124 is applied.
- the inner peripheral surface of the tapered portion 125b in the accommodating portion 125 is formed in a gradually narrowed shape, so that the ball seat 130 is inserted.
- the stud side holding part 131a in the ball seat 130 is pushed by the taper part 125b and tilts toward the ball part 113 to be deformed.
- the first groove portion 132 formed in the stud side holding portion 131a of the ball seat 130 is formed only in a shape in which the curvature of the inner surface in the cross section becomes a finite value, and the shape in which the curvature of the inner surface becomes an infinite value.
- the load to deform is applied to specific parts such as these corners. It is press-fitted in a state in which concentration and stress overload and damage are suppressed.
- FIG. 5 (B) shows a case where a cross-sectional shape in which two side surfaces made of two straight portions SL are provided on the bottom surface made of SL and corner portions C are formed at both ends of the bottom portion is formed in a square shape.
- the first groove 132, cracking of the stud holding portion 131a at the time of deformation due to the depth D 1 is formed on 40% of the thickness of the stud holding portion 131a And the generation of cracks can be suppressed.
- the opening width W 1 can be suppressed narrowing of the opening width W 1 due to the deformation because it is formed by larger opening than the thickness of the stud holding portion 131a.
- the press working device fixes the plug by bending the opening portion of the straight portion 125a of the socket 120 inward and caulking.
- the plug 124 is fixed by forming the portion 123.
- the ball seat 130 is fixedly held in the holding portion 131 of the socket 120 in a state where the stud side holding portion 131a is pressed against the ball portion 113 and deformed.
- the operator prepares the dust cover 140 and the circlip 141 and attaches them to the ball stud 110 and the socket 120, respectively. Specifically, the worker After an appropriate amount of grease 133 is applied on the ball portion 113 exposed from the stud opening 122 of the socket 120, one end (upper side in the drawing) of the dust cover 140 is fitted into the outer periphery of the stud portion 111 of the ball stud 110. The other end (lower side in the figure) of the dust cover 140 is fitted into a recess formed in the upper part of the outer periphery of the socket body 121 in the figure. Then, the operator fixes the dust cover 140 to the socket body 121 by fitting the circlip 141 into the dust cover 140 fitted to the outer periphery of the socket body 121. Thereby, the ball joint 100 is completed.
- the ball joint 100 is a device that maintains the running stability and steering stability of the vehicle by attenuating vibrations from the road surface and grounding the wheels to the road surface.
- the ball joint 100 supports the load from the vehicle while rotating or swinging the ball stud 110 in a certain direction in the suspension mechanism.
- the ball stud 110 swings in a certain direction in accordance with the vertical movement when the vehicle travels.
- the ball portion 113 accommodated in the holding portion 131 of the ball sheet 130 rotates and slides in a certain direction corresponding to the swinging direction of the ball stud 110 in the holding portion 131 of the ball sheet 130.
- the ball sheet 130 holds the ball portion 113 while sliding the ball portion 113 smoothly by the grease 133 supplied from the first groove portion 132 and the second groove portion 134.
- the ball seat 130 is formed only in a shape in which the surface of the first groove 132 has a finite curvature even when a compression load or a tensile load is applied between the ball portion 113 and the accommodating portion 125 in the socket 120. Therefore, the occurrence of damage from the first groove portion 132 can be suppressed.
- the ball seat 130 has a second groove portion 134 that has a corner portion at the bottom at a portion that receives the load in the axial direction of the ball stud 110 from the ball portion 113 and increases the amount of grease 133 retained. A sufficient grease 133 can be supplied between the ball portion 113 and the holding portion 131 to ensure smooth slidability.
- the ball sheet 130 has the first groove portion 132 formed in the holding portion 131 that slidably holds the ball portion 113 of the ball stud 110.
- the inner surface has a finite curvature.
- the ball sheet 130 does not have a portion with an infinite curvature in the cross-sectional shape of the first groove portion 132, for example, a corner portion such as a right angle, an acute angle and an obtuse angle, or other sharp pointed portion,
- a corner portion such as a right angle, an acute angle and an obtuse angle, or other sharp pointed portion
- the ball seat 130 can simplify the assembly process of the ball joint 100 and improve the yield and can be efficiently assembled.
- the first groove 132 is configured only with a shape in which the curvature of the inner surface has a finite value in the cross-sectional shape.
- the first groove portion 132 may include a straight portion SL in the surface shape in the cross section, and as shown in FIG. 7, the cross sectional shape is the first groove portion.
- the groove width W 3 inside 132 may be formed in a so-called undercut shape wider than the opening width W 1 on the inner surface of the holding portion in the first groove portion 132.
- the 1st groove part 132 can also be formed in the cross-sectional shape without including the boundary part which the 1st groove part 132 opens on the internal peripheral surface of the stud side holding part 131a, as shown in FIG.
- the first groove 132 is formed in a shape in which the first differential value of the distance r ( ⁇ ) between the central axis CL of the holding portion 131 and the inner surface of the first groove 132 changes continuously. Also good.
- the first groove 132 has a distance r ( ⁇ ) between the central axis CL of the holding portion 131 and the inner surface of the first groove 132 out of the first grooves 132 having a finite cross-sectional shape in the above embodiment.
- the two linear portions SL constituting the two side surfaces in the first groove portion 132 are deeper than the inner surface of the holding portion 131.
- the shape formed perpendicular to the vertical direction in other words, the shape in which the two straight portions SL are formed on the virtual straight line IL extending from the central axis CL of the holding portion 131 (that is, formed in parallel), as shown in FIG.
- the cross-sectional shape of the first groove portion 132 is formed into a shape in which the first derivative of the distance r ( ⁇ ) between the central axis CL of the holding portion 131 and the inner surface of the first groove portion 132 changes continuously.
- the first groove portion 132 extending along the central axis CL of the holding portion 131, in other words, the first groove portion 132 formed in such a manner that the central axis CL exists as a point in the cross-sectional plane of the first groove portion 132.
- the mode of the first groove 132 extending along the central axis CL of the holding unit 131 includes not only a mode extending in parallel with the central axis CL but also a mode extending in a spiral shape.
- the central axis CL of the holding portion 131 is also a central axis of the socket 120 and the ball seat 130 formed in a cylindrical shape, and is also a central axis of the ball stud 110 formed in the axial shape.
- the two straight portions SL constituting the two side surfaces of the first groove portion 132 shown in FIG. 6 are not perpendicular to the inner surface of the holding portion 131 in the depth direction but constitute the bottom portion through the central axis CL. It is formed in parallel to a straight line perpendicular to the straight line portion SL, and has a shape in which the primary differential value of the distance r ( ⁇ ) changes continuously.
- the first groove portion 132 is formed in the stud side holding portion 131 a in the holding portion 131 of the ball seat 130.
- the first groove portion 132 only needs to be formed in a portion of the holding portion 131 that is deformed at least toward the ball portion 113. Therefore, the 1st groove part 132 can also be formed on the front end side holding part 131b in addition to or instead of the stud side holding part 131a, for example.
- the first groove 132 and the second groove 134 are arranged on the stud-side holding part 131a and the tip-side holding part 131b of the holding part 131 of the ball seat 130, respectively.
- (CL) 6 were formed along the direction.
- the direction in which the first groove portion 132 and the second groove portion 134 are formed is not limited to the above embodiment. Therefore, the first groove portion 132 and the second groove portion 134 can be formed on the inner peripheral surface of the holding portion 131 in the circumferential direction of the holding portion 131 in addition to or instead of the axial direction of the holding portion 131. Alternatively, a spiral shape can be formed.
- the number of the first groove portions 132 and the second groove portions 134 may be one or more and five or less, or may be seven or more. Further, the numbers of the first groove 132 and the second groove 134 may be different from each other. That is, the ball seat 130 can be configured by forming only the first groove 132 on the stud side holding portion 131a and / or the tip end side holding portion 131b.
- the second groove 134 is formed with a depth D 2 shallower than the depth D 1 of the first groove 132. Thereby, even if the 2nd groove part 134 is formed including the corner
- the second groove 134 does not exclude that is deeper than the depth D 2 depth D 1 of the first groove 132. That is, the second groove 134, if the holding portion 131 is long formed thick enough for the load, may be deeper than the depth D 2 depth D 1 of the first groove 132.
- the holding portion 131 in the ball sheet 130 is configured such that the stud side holding portion 131a is deformed to the ball portion 113 side by the tapered portion 125b in the socket 120.
- the holding part 131 in the ball seat 130 is not necessarily limited to the above-described embodiment as long as it is housed in the deformed state socket 120 pressed against the ball part 113 side by the housing part 131.
- the stud opening 122 is formed into a straight cylindrical shape with a constant inner diameter and the ball seat 130 is disposed in the housing portion 125
- the stud opening 122 is
- the stud side holding part 131a of the holding part 131 in the ball seat 120 may be tilted toward the ball part 113 and deformed by caulking.
- the stud side holding part 131a in the holding part 131 may be either elastically deformed or plastically deformed, including the above embodiment.
- the ball joint 100 is adopted in the suspension mechanism.
- the ball joint 100 according to the present invention is not limited to this.
- the ball joint 100 can be widely applied to a steering mechanism as well as a suspension mechanism constituting a vehicle such as an automobile.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- Geometry (AREA)
- Pivots And Pivotal Connections (AREA)
Abstract
Description
このように構成されたボールジョイント100の製造について説明する。なお、このボールジョイント100の製造工程の説明においては、本発明に直接関わらない製造工程については適宜省略する。
ソケット120のスタッド開口部122から露出するボール部113上にグリース133を適量塗布した後、ダストカバー140における一方(図示上側)の端部をボールスタッド110におけるスタッド部111の外周部に嵌め込むとともに、同ダストカバー140における他方(図示下側)の端部をソケット本体121の外周部における図示上部に形成された凹部上に嵌め込む。そして、作業者は、ソケット本体121の外周部に嵌め込んだダストカバー140にサークリップ141を嵌め込むことによりダストカバー140をソケット本体121に固定する。これにより、ボールジョイント100が完成する。
次に、このように構成されたボールジョイント100の作動について説明する。本実施形態においては、ボールジョイント100を自動車などの車両のサスペンション機構(懸架装置)に組み込んだ例について説明する。ここで、サスペンション機構(懸架装置)とは、車両において路面からの振動を減衰するとともに車輪を確実に路面に接地させることにより、車両の走行安定性および操縦安定性を維持する装置である。そして、ボールジョイント100は、サスペンション機構においてボールスタッド110を一定の方向に回転または揺動させながら車両からの負荷を支える。
100…ボールジョイント、
110…ボールスタッド、111…スタッド部、112…括れ部、113…ボール部、113a…先端側の半球部、113b…スタッド側の半球部、114…雄ネジ、
120…ソケット、121…ソケット本体、122…スタッド開口部、123…プラグ固定部、124…プラグ、125…収容部、125a…ストレート部、125b…テーパ部、
130…ボールシート、131…保持部、131a…スタッド側保持部、131b…先端側保持部、132…第1溝部、133…グリース、134…第2溝部、
140…ダストカバー、141…サークリップ。
Claims (6)
- 棒状に延びるボールスタッドの先端部に形成されたボール部を摺動可能に収容した筒状の保持部がソケットの内表面によって前記ボール部側に押し付けられて変形した状態で前記ソケット内に収容されるボールシートであって、
前記保持部は、
少なくとも前記変形する部分における内表面に凹状に凹んで延びる第1溝部を有しており、
前記第1溝部は、
横断面における内表面の曲率が全長に亘って有限値となる形状に形成されていることを特徴とするボールシート。 - 請求項1に記載したボールシートにおいて、
前記第1溝部は、
前記筒状の保持部の中心軸と前記第1溝部の内表面との距離の一次微分値が連続的に変化する形状に形成されていることを特徴とするボールシート。 - 請求項1または請求項2に記載したボールシートにおいて、
前記第1溝部は、
前記保持部の厚さの40%以上かつ50%以下の深さで形成されていることを特徴とするボールシート。 - 請求項1ないし請求項3のうちのいずれか1つに記載したボールシートにおいて、
前記第1溝部は、
前記保持部の内表面における開口幅が前記保持部の厚さより大きいことを特徴とするボールシート。 - 請求項1ないし請求項4のうちのいずれか1つに記載したボールシートにおいて、
前記保持部は、
前記ボール部から前記ボールスタッドの軸線方向の荷重を受ける部分における内表面に凹状に凹んで延びる第2溝部を含んでおり、
前記第2溝部は、
横断面における少なくとも底部に角部を有して構成されていることを特徴とするボールシート。 - 軸状のスタッド部の先端部に球状のボール部を有するボールスタッドと、
前記請求項1ないし請求項5のうちのいずれか1つに記載したボールシートと、
前記ボールシートにおける保持部を内表面によって前記ボール部側に押し付けて変形させた状態で収容するソケットとを備えたことを特徴とするボールジョイント。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14853576.8A EP3048315B1 (en) | 2013-10-17 | 2014-10-06 | Ball seat and ball joint |
CN201480052008.0A CN105579718A (zh) | 2013-10-17 | 2014-10-06 | 球座及球型接头 |
US15/025,501 US20160265584A1 (en) | 2013-10-17 | 2014-10-06 | Ball seat and ball joint |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013216048A JP6253337B2 (ja) | 2013-10-17 | 2013-10-17 | ボールシートおよびボールジョイント |
JP2013-216048 | 2013-10-17 |
Publications (1)
Publication Number | Publication Date |
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WO2015056592A1 true WO2015056592A1 (ja) | 2015-04-23 |
Family
ID=52828040
Family Applications (1)
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PCT/JP2014/076686 WO2015056592A1 (ja) | 2013-10-17 | 2014-10-06 | ボールシートおよびボールジョイント |
Country Status (5)
Country | Link |
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US (1) | US20160265584A1 (ja) |
EP (1) | EP3048315B1 (ja) |
JP (1) | JP6253337B2 (ja) |
CN (1) | CN105579718A (ja) |
WO (1) | WO2015056592A1 (ja) |
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US10557496B2 (en) * | 2016-04-08 | 2020-02-11 | RB Distribution, Inc. | Ball joint |
EP3669092B1 (en) * | 2017-08-16 | 2022-06-22 | Multimatic, Inc. | Ball joint with injection molded bearing |
JP7175856B2 (ja) * | 2019-07-17 | 2022-11-21 | 日本発條株式会社 | ボールシート、ボールジョイント及びボールジョイントの製造方法 |
JP7185293B2 (ja) * | 2019-10-29 | 2022-12-07 | 株式会社ソミックマネージメントホールディングス | ボールジョイント |
JP2022124951A (ja) * | 2021-02-16 | 2022-08-26 | 大同メタル工業株式会社 | ボールソケット構造 |
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Also Published As
Publication number | Publication date |
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CN105579718A (zh) | 2016-05-11 |
EP3048315A4 (en) | 2017-03-01 |
JP2015078738A (ja) | 2015-04-23 |
US20160265584A1 (en) | 2016-09-15 |
EP3048315B1 (en) | 2020-03-04 |
EP3048315A1 (en) | 2016-07-27 |
JP6253337B2 (ja) | 2017-12-27 |
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