US20190030979A1 - Hollow spring member - Google Patents

Hollow spring member Download PDF

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Publication number
US20190030979A1
US20190030979A1 US16/145,037 US201816145037A US2019030979A1 US 20190030979 A1 US20190030979 A1 US 20190030979A1 US 201816145037 A US201816145037 A US 201816145037A US 2019030979 A1 US2019030979 A1 US 2019030979A1
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US
United States
Prior art keywords
rod
axis
hollow
distal
center
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US16/145,037
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English (en)
Inventor
Masahiro Umezawa
Daisuke Takeda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NHK Spring Co Ltd
Original Assignee
NHK Spring Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NHK Spring Co Ltd filed Critical NHK Spring Co Ltd
Assigned to NHK SPRING CO., LTD. reassignment NHK SPRING CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TAKEDA, DAISUKE, UMEZAWA, MASAHIRO
Publication of US20190030979A1 publication Critical patent/US20190030979A1/en
Priority to US17/696,971 priority Critical patent/US11701943B2/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/14—Resilient suspensions characterised by arrangement, location or kind of springs having helical, spiral or coil springs only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
    • B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
    • B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
    • B60G15/062—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the spring being arranged around the damper
    • 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
    • B60G21/045—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 different axles on the same side of the vehicle, i.e. the left or the right side
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/04—Wound springs
    • F16F1/042—Wound springs characterised by the cross-section of the wire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/04—Wound springs
    • F16F1/06—Wound springs with turns lying in cylindrical surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/14—Torsion springs consisting of bars or tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/12—Wound spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/13—Torsion spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/13—Torsion spring
    • B60G2202/135—Stabiliser bar and/or tube
    • 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
    • B60G2206/012—Hollow or tubular elements
    • 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
    • B60G2206/40—Constructional features of dampers and/or springs
    • B60G2206/42—Springs
    • B60G2206/427—Stabiliser bars or tubes
    • 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
    • B60G2206/70—Materials used in suspensions
    • B60G2206/72—Steel
    • B60G2206/724—Wires, bars or the like
    • 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
    • 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
    • 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
    • B60G2206/8103—Shaping by folding or bending
    • B60G2206/81035—Shaping by folding or bending involving heating to relieve internal stresses
    • 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
    • B60G2206/8106—Shaping by thermal treatment, e.g. curing hardening, vulcanisation
    • 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
    • B60G2206/8109—Shaping by rolling
    • 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
    • B60G2206/8112—Shaping by thermal spraying of molten material
    • 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
    • B60G2206/84—Hardening
    • B60G2206/8403—Shot-peening
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/02—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2224/00—Materials; Material properties
    • F16F2224/02—Materials; Material properties solids
    • F16F2224/0208—Alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2226/00—Manufacturing; Treatments
    • F16F2226/02—Surface treatments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2234/00—Shape
    • F16F2234/02—Shape cylindrical

Definitions

  • the present invention relates to a hollow spring member such as a coil spring, a stabilizer, or a torsion rod, using a hollow rod as the material.
  • the upper spring seat supports an upper end of the coil spring.
  • the lower spring seat supports a lower end of the coil spring.
  • the coil spring is compressed between the lower spring seat and the upper spring seat. Further, the coil spring extends and retracts in accordance with the magnitude of a load applied between the lower spring seat and the upper spring seat.
  • a coil spring which constitutes the suspension is not an exception, and reducing the weight of the coil spring is an inevitable requirement.
  • Patent Literature 1 JP 2007-127227 A
  • Patent Literature 2 JP 2012-117612 A
  • JP 2012-117612 A describes the technology of closing an opening at a distal end of a rod of a hollow coil spring by spinning.
  • the distal end of the rod is formed to be hemispherical (in a dome shape) by the spinning.
  • an object of the present invention is to provide a hollow spring member having a terminal sealed portion in which a distal end of a rod is reliably closed.
  • One embodiment of the present invention relates to a hollow spring member constituted of a hollow rod, and includes a terminal sealed portion at an end portion of the rod.
  • the terminal sealed portion has a rotationally symmetric shape in which an axis passing through the center of the rod is a symmetric axis, and includes an end wall portion including an end face, a distal-end-center closure portion, and a recess formed on an inner surface of the end wall portion.
  • the distal-end-center closure portion is formed on the axis at the center of the end wall portion.
  • the recess has a rotationally symmetric shape in which the axis is the symmetric axis.
  • the recess has such a shape that a thickness of the end wall portion is reduced toward the axis, and the center of the recess is located on the axis.
  • One embodiment of the hollow spring member is a hollow coil spring constituted of a hollow rod (wire) that is formed into a helical shape.
  • Another embodiment of the hollow spring member is a vehicle stabilizer constituted of a hollow rod in which a torsion portion and an arm portion are formed.
  • An example of the hollow spring member may be a torsion rod.
  • FIG. 5 is a cross-sectional view showing an example of an end portion of a hollow rod before the terminal sealed portion is formed.
  • FIG. 6 is a flowchart showing an example of steps of manufacturing the hollow coil spring.
  • FIG. 7 is a cross-sectional view showing an example of a rod having a chamfered portion on an inner side of the end portion.
  • FIG. 9 is a cross-sectional view of a terminal sealed portion according to a second embodiment.
  • FIG. 10 is a cross-sectional view of a terminal sealed portion according to a third embodiment.
  • FIG. 12 is a plan view of a torsion rod according to a fifth embodiment.
  • FIG. 1 shows a part of a McPherson-strut-type suspension 1 , as an example of a vehicle suspension.
  • the suspension 1 of the present embodiment comprises a hollow coil spring 10 , a lower spring seat 11 , an upper spring seat 12 , and a shock absorber 13 .
  • the lower spring seat 11 supports a lower end turn portion 10 a of the hollow coil spring 10 .
  • the upper spring seat 12 supports an upper end turn portion 10 b of the hollow coil spring 10 .
  • the shock absorber 13 functions as a strut.
  • the hollow coil spring 10 may be used for a suspension other than the McPherson-strut-type suspension.
  • the hollow coil spring 10 of the present embodiment includes a hollow rod (a hollow wire) 20 that is helically formed (coiled).
  • the hollow rod 20 is a material of the hollow coil spring 10 , and is made of spring steel.
  • the specific shape of the hollow coil spring 10 is not limited to cylindrical, and the hollow coil spring 10 may be formed variously as, for example, a barrel-shaped coil spring, an hourglass coil spring, a tapered coil spring, a variable pitch coil spring, and springs of the other shapes.
  • terminal sealed portions 30 are formed, respectively.
  • the terminal sealed portions 30 are formed in advance by a spinning apparatus 60 before the rod 20 is formed (coiled) helically.
  • FIG. 2 shows a cross section of the terminal sealed portion 30 along an axis X 1 .
  • FIG. 3 is a front view of the terminal sealed portion 30 shown in FIG. 2 .
  • a cross section obtained in a radial direction perpendicular to the axis X 1 of the rod 20 is circular.
  • the terminal sealed portion 30 has a rotationally symmetric shape in which the axis X 1 passing through a center C ( FIG. 3 ) of the rod 20 is the symmetric axis. More specifically, the terminal sealed portion 30 has such a shape that its cross section along the axis X 1 does not change even if the terminal sealed portion 30 is rotated by an arbitrary angle about the axis X 1 .
  • the cross section along the axis X 1 is intended as a cross section obtained in a longitudinal direction passing through the center C (axis X 1 ) of the rod 20 . Inside the rod 20 , an enclosed space 31 is formed.
  • the terminal sealed portion 30 includes an end wall portion 41 including an end face 40 , and an arc-shaped curved surface 42 .
  • a center 40 c of the end face 40 is located on the axis X 1 .
  • the end face 40 shown in FIG. 2 has such a convex shape that a portion near the center 40 c is slightly projected to the outside.
  • the end face 40 may have a flat shape substantially perpendicular to the axis X 1 .
  • the end face 40 may have such a convex shape that the end face 40 is slightly bulged in a shape of an arc.
  • the arc-shaped curved surface 42 is formed in a shape of an arc between an outer peripheral surface 20 c of the rod 20 and the end face 40 .
  • the arc-shaped curved surface 42 connects between the outer peripheral surface 20 c of the rod 20 and the end face 40 with a smooth curved surface.
  • An inner surface 20 d of the rod 20 has a rotationally symmetric shape in which the axis X 1 is the symmetric axis, likewise the outer peripheral surface 20 c.
  • a distal-end-center closure portion 43 is formed on the axis X 1 at the center of the end wall portion 41 .
  • a distal end (distal end opening portion) 20 e of the hollow rod 20 is converged toward the axis X 1 by the spinning.
  • the distal end (distal end opening portion) 20 e of the rod 20 subjected to spinning merges on the axis X 1 to be joined together and formed as an integral part, the distal-end-center closure portion 43 is formed.
  • a recess 45 On an inner surface of the end wall portion 41 , a recess 45 having a rotationally symmetric shape in which the axis X 1 is the symmetric axis is formed.
  • the recess 45 has such a shape that a thickness t of the end wall portion 41 is reduced toward the axis X 1 . Moreover, the center of the recess 45 (i.e., a distal end 45 a of the recess 45 ) is located on the axis X 1 (symmetric axis), likewise the distal-end-center closure portion 43 . At the center of the recess 45 , the distal-end-center closure portion 43 is formed. A thickness t 1 of the distal-end-center closure portion 43 is less than the thickness t at a part surrounding the distal-end-center closure portion 43 .
  • FIG. 4 is a side view schematically showing a part of a spinning apparatus 60 .
  • the terminal sealed portion 30 is formed at the end portion 20 a of the rod (hollow wire) 20 .
  • FIG. 5 is a cross-sectional view of the rod 20 before the terminal sealed portion 30 is formed.
  • An example of an outside diameter D of the rod 20 is 19 mm, and an example of a thickness T is 3 mm.
  • the rod 20 has a rotationally symmetric shape in which the axis X 1 is the symmetric axis.
  • the distal-end-center closure portion 43 exists on the axis X 1 at the center of the end wall portion 41 .
  • the distal-end-center closure portion 43 is hermetically closed by the spinning. Accordingly, it is possible to prevent fluid such as water, oil, and gas, from entering inside the enclosed space 31 through the distal-end-center closure portion 43 , from outside the end wall portion 41 .
  • the end face 40 and the arc-shaped curved surface 42 of the terminal sealed portion 30 are formed when the terminal sealed portion 30 is formed by the spinning apparatus 60 . More specifically, the end face 40 and the arc-shaped curved surface 42 can be formed in accordance with a locus of movement of the spinning jig 63 during the spinning. Accordingly, there is no need to separately add a different step such as machining for forming the end face 40 and the arc-shaped curved surface 42 .
  • the recess 45 On an inner surface of the end wall portion 41 , the recess 45 having a rotationally symmetric shape in which the axis X 1 is the symmetric axis is formed.
  • FIG. 9 shows a cross section of a terminal sealed portion 30 A according to a second embodiment.
  • the terminal sealed portion 30 A also has a rotationally symmetric shape in which an axis X 1 of a rod 20 is the symmetric axis, likewise the terminal sealed portion 30 of the first embodiment.
  • the terminal sealed portion 30 A includes an end wall portion 41 , an arc-shaped curved surface 42 , a distal-end-center closure portion 43 , and a recess 45 in a cross section along the axis X 1 (symmetric axis).
  • the end wall portion 41 includes an end face 40 a , which is perpendicular to the axis X 1 , and is substantially flat.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Springs (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Damping Devices (AREA)
  • Wire Processing (AREA)
US16/145,037 2016-03-30 2018-09-27 Hollow spring member Abandoned US20190030979A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US17/696,971 US11701943B2 (en) 2016-03-30 2022-03-17 Method of manufacturing a hollow spring member

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2016-068043 2016-03-30
JP2016068043 2016-03-30
PCT/JP2017/013098 WO2017170790A1 (ja) 2016-03-30 2017-03-29 中空ばね部材

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/013098 Continuation WO2017170790A1 (ja) 2016-03-30 2017-03-29 中空ばね部材

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/696,971 Division US11701943B2 (en) 2016-03-30 2022-03-17 Method of manufacturing a hollow spring member

Publications (1)

Publication Number Publication Date
US20190030979A1 true US20190030979A1 (en) 2019-01-31

Family

ID=59965773

Family Applications (2)

Application Number Title Priority Date Filing Date
US16/145,037 Abandoned US20190030979A1 (en) 2016-03-30 2018-09-27 Hollow spring member
US17/696,971 Active US11701943B2 (en) 2016-03-30 2022-03-17 Method of manufacturing a hollow spring member

Family Applications After (1)

Application Number Title Priority Date Filing Date
US17/696,971 Active US11701943B2 (en) 2016-03-30 2022-03-17 Method of manufacturing a hollow spring member

Country Status (9)

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US (2) US20190030979A1 (ja)
EP (1) EP3438495B1 (ja)
JP (1) JP6569004B2 (ja)
KR (1) KR102193079B1 (ja)
CN (1) CN109154346B (ja)
ES (1) ES2906882T3 (ja)
HU (1) HUE057577T2 (ja)
MX (1) MX2018011710A (ja)
WO (1) WO2017170790A1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11059344B2 (en) * 2017-07-14 2021-07-13 Nhk Spring Co., Ltd. Stabilizer for vehicle, and shot peening jig for stabilizer
US11254177B2 (en) * 2016-03-30 2022-02-22 Nhk Spring Co., Ltd. Hollow coil spring and suspension device for vehicle
US11701943B2 (en) 2016-03-30 2023-07-18 Nhk Spring Co., Ltd Method of manufacturing a hollow spring member

Citations (9)

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EP3438495B1 (en) 2022-01-12
CN109154346B (zh) 2020-08-14
KR102193079B1 (ko) 2020-12-18
EP3438495A4 (en) 2019-11-27
ES2906882T3 (es) 2022-04-20
MX2018011710A (es) 2018-12-19
JP6569004B2 (ja) 2019-08-28
US20220203800A1 (en) 2022-06-30
JPWO2017170790A1 (ja) 2018-10-25
WO2017170790A1 (ja) 2017-10-05
HUE057577T2 (hu) 2022-05-28
KR20180116398A (ko) 2018-10-24
US11701943B2 (en) 2023-07-18
CN109154346A (zh) 2019-01-04

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