WO2021107070A1 - 板ばね装置 - Google Patents

板ばね装置 Download PDF

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Publication number
WO2021107070A1
WO2021107070A1 PCT/JP2020/044143 JP2020044143W WO2021107070A1 WO 2021107070 A1 WO2021107070 A1 WO 2021107070A1 JP 2020044143 W JP2020044143 W JP 2020044143W WO 2021107070 A1 WO2021107070 A1 WO 2021107070A1
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WO
WIPO (PCT)
Prior art keywords
longitudinal direction
inclined surface
leaf spring
plate width
vertical direction
Prior art date
Application number
PCT/JP2020/044143
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
剛司 江口
佑介 田中
Original Assignee
日本発條株式会社
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 日本発條株式会社 filed Critical 日本発條株式会社
Priority to EP20891567.8A priority Critical patent/EP4067688B1/en
Priority to CN202080081485.5A priority patent/CN114746667B/zh
Priority to KR1020227016526A priority patent/KR20220078709A/ko
Priority to JP2021561530A priority patent/JP7209864B2/ja
Priority to US17/779,660 priority patent/US11927233B2/en
Priority to MX2022006157A priority patent/MX2022006157A/es
Priority to CA3163112A priority patent/CA3163112A1/en
Publication of WO2021107070A1 publication Critical patent/WO2021107070A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/18—Leaf 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
    • 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
    • F16F1/18—Leaf springs
    • F16F1/182—Leaf springs with inter-engaging portions between leaves or between leaves and mountings, e.g. ridges, notches, ripples
    • 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
    • F16F3/00—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic
    • F16F3/02—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of steel or of other material having low internal friction
    • F16F3/023—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of steel or of other material having low internal friction composed only of leaf 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
    • F16F2230/00—Purpose; Design features
    • F16F2230/0005—Attachment, e.g. to facilitate mounting onto confer adjustability
    • 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
    • F16F2238/00—Type of springs or dampers
    • F16F2238/02—Springs
    • F16F2238/022—Springs leaf-like, e.g. of thin, planar-like metal

Definitions

  • the present invention relates to a leaf spring device.
  • the present application claims priority based on Japanese Patent Application No. 2019-214204 filed in Japan on November 27, 2019, the contents of which are incorporated herein by reference.
  • a leaf spring device having a plurality of leaf springs provided so as to be stacked in the vertical direction has been known.
  • this type of leaf spring device among a plurality of leaf springs, holding plates extending in the vertical direction are separately provided at both ends in the leaf width direction of one leaf spring, and the remaining leaf springs are provided by these holding plates. It is known that it is sandwiched in the plate width direction. With this configuration, leaf springs adjacent to each other in the vertical direction are prevented from extending in the vertical direction and relatively rotating around the central axis passing through the central portions of the plurality of leaf springs.
  • the present invention has been made in consideration of such circumstances, and it is possible to suppress the relative rotation of leaf springs adjacent to each other in the vertical direction around the central axis while suppressing bulkiness and ensuring durability. It is an object of the present invention to provide a leaf spring device capable of providing a device.
  • the leaf spring device of one aspect of the present invention includes a plurality of leaf springs provided so as to be stacked in the vertical direction, and is restricted to the surface of one of two leaf springs adjacent to each other in the vertical direction.
  • a protrusion is provided, a recess is formed on the surface of one of the leaf springs, the regulating protrusion is inserted into the recess, and the longitudinal direction of each of the regulating protrusion and the recess is viewed from the vertical direction. It coincides with the longitudinal direction of the leaf spring, and when viewed from the vertical direction, the central portions of the leaf spring, the regulating protrusion, and the recessed portion coincide with each other, and the regulating protrusion is orthogonal to the vertical direction and the longitudinal direction.
  • the first side surface and the second side surface which extend in the plate width direction and extend in the longitudinal direction and are located on both sides of the leaf spring, the regulation protrusion, and the recess portion in the plate width direction when viewed from the vertical direction.
  • the recessed portion is provided with a third side surface and a fourth side surface which are oriented in the plate width direction and extend in the longitudinal direction and face each other with the regulation protrusion in the plate width direction, and the first side surface and the first side surface are provided.
  • the three side surfaces face each other in the plate width direction, the second side surface and the fourth side surface face each other in the plate width direction, and one of the first side surface and the third side surface Is formed with a first inclined surface that is separated from one of the other side surfaces in the plate width direction from the central portion toward the first direction along the longitudinal direction, and is of the second side surface and the fourth side surface.
  • On one of the side surfaces there is a second inclined surface that separates from the other side surface in the plate width direction from the central portion along the longitudinal direction toward the second direction opposite to the first direction. It is formed.
  • a regulation protrusion inserted into a recess formed on the surface of one of two leaf springs adjacent to each other in the vertical direction is provided on the surface of one of the two leaf springs. It is provided. Therefore, when the leaf springs adjacent to each other in the vertical direction rotate relative to each other around the central axis extending in the vertical direction and passing through the central portions of the leaf springs, the regulating protrusions, and the recesses when viewed from the vertical direction. This relative rotation can be regulated by the first side surface of the regulating protrusion and the third side surface of the recessed portion being in contact with each other, and the second side surface of the regulating protrusion and the fourth side surface of the recessed portion being in contact with each other.
  • a surface is formed, and one of the second side surface and the fourth side surface is formed from the central portion along the longitudinal direction toward the second direction opposite to the first direction.
  • a second inclined surface is formed which is separated from the side surface in the plate width direction.
  • the leaf springs adjacent to each other in the vertical direction rotate relative to each other around the central axis
  • the first side surface of the regulation protrusion and the third side surface of the recessed portion come into surface contact with each other by the first inclined surface
  • the second side surface and the fourth side surface of the recessed portion are in surface contact with each other by the second inclined surface.
  • the longitudinal directions of the regulating protrusions and the recesses coincide with the longitudinal directions of the leaf springs.
  • the longitudinal directions of the regulating protrusions and the recesses are respectively extended in the leaf width direction of the leaf springs, as compared with the configuration in which the leaf springs are bent and deformed in the vertical direction.
  • the regulation protrusion can be made difficult to come off from the recessed portion.
  • a regulating protrusion and a recess are provided between two leaf springs adjacent to each other in the vertical direction. Therefore, it is possible to achieve the above-mentioned effects without causing a protruding portion with respect to the plurality of leaf springs, and it is possible to prevent the leaf spring device from being bulky.
  • the inclination angle of the first inclined surface with respect to the longitudinal direction and the inclination angle of the second inclined surface with respect to the longitudinal direction may be the same as each other.
  • the inclination angle of the first inclined surface with respect to the longitudinal direction and the inclination angle of the second inclined surface with respect to the longitudinal direction are the same when viewed from the vertical direction. Therefore, the leaf springs adjacent to each other in the vertical direction rotate relative to each other around the central axis, the first side surface of the regulating protrusion and the third side surface of the recessed portion are in contact with each other, and the second side surface of the regulating protrusion and the second side surface of the recessed portion are in contact with each other.
  • the four side surfaces come into contact with each other, it is possible to reliably suppress the occurrence of a portion where stress is concentrated on the first to fourth side surfaces.
  • a third side surface of one of the first side surface and the third side surface is separated from the other side surface in the plate width direction from the central portion toward the second side along the longitudinal direction.
  • An inclined surface is formed, and a plate is formed on one of the second side surface and the fourth side surface from the other side surface in the longitudinal direction from the central portion toward the first side surface.
  • a fourth inclined surface that is separated in the width direction may be formed.
  • the first to fourth inclined surfaces are provided. Therefore, regardless of the rotation direction around the central axis of the leaf springs adjacent to each other in the vertical direction, the first side surface of the regulating protrusion and the third side surface of the recessed portion are brought into surface contact with each other, and the second side surface and the recessed portion of the regulating protrusion are brought into surface contact with each other. It becomes possible to bring the fourth side surfaces of the above into surface contact with each other. As a result, it is possible to reliably suppress the occurrence of a portion where stress is concentrated on the first to fourth side surfaces.
  • the inclination angle of the third inclined surface with respect to the longitudinal direction and the inclination angle of the fourth inclined surface with respect to the longitudinal direction may be the same as each other.
  • the inclination angle of the third inclined surface with respect to the longitudinal direction and the inclination angle of the fourth inclined surface with respect to the longitudinal direction are the same when viewed from the vertical direction. Therefore, the leaf springs adjacent to each other in the vertical direction rotate relative to each other around the central axis, the first side surface of the regulating protrusion and the third side surface of the recessed portion are in contact with each other, and the second side surface of the regulating protrusion and the second side surface of the recessed portion are in contact with each other.
  • the four side surfaces come into contact with each other, it is possible to reliably suppress the occurrence of a portion where stress is concentrated on the first to fourth side surfaces.
  • the inclination angle of the first inclined surface with respect to the longitudinal direction When viewed from the vertical direction, the inclination angle of the first inclined surface with respect to the longitudinal direction, the inclination angle of the second inclined surface with respect to the longitudinal direction, the inclination angle of the third inclined surface with respect to the longitudinal direction, and the first with respect to the longitudinal direction. 4
  • the inclination angles of the inclined surfaces may be the same as each other.
  • the inclination angles of the first to fourth inclined surfaces as seen from the vertical direction with respect to the longitudinal direction are the same as each other. Therefore, it is possible to equalize the loads applied to the first to fourth side surfaces regardless of the rotation direction around the central axis of the leaf springs adjacent to each other in the vertical direction, and ensure durability. Can be done.
  • the width of the regulating protrusion in the plate width direction becomes narrower as the distance from the surface of the leaf spring on which the regulating protrusion is formed increases in the vertical direction, and the width of the recessed portion in the plate width direction is such that the recessed portion is formed. It may become narrower as the distance from the surface of the leaf spring increases in the vertical direction.
  • the width of the regulating protrusion in the plate width direction becomes narrower as it is separated from the surface of the leaf spring on which the regulating protrusion is formed in the vertical direction, and the width of the recessed portion in the plate width direction is formed. It becomes narrower as it moves away from the surface of the leaf spring in the vertical direction. Therefore, as compared with the configuration in which the widths of the regulating protrusions and the recesses are the same over the entire area in the vertical direction, it is possible to secure a wider flat area for each of the first to fourth side surfaces, and the regulating protrusions can be secured.
  • FIG. 2 is a cross-sectional view taken along the line II-II of the leaf spring device shown in FIG.
  • FIG. 3 is a cross-sectional view taken along the line III-III of the leaf spring device shown in FIG. It is sectional drawing of the leaf spring device of 2nd Embodiment which concerns on this invention. It is sectional drawing of the leaf spring device of 3rd Embodiment which concerns on this invention. It is sectional drawing of the leaf spring device of 4th Embodiment which concerns on this invention.
  • the leaf spring device 1 of the present embodiment includes a plurality of leaf springs 11 and 12 provided so as to be stacked in the vertical direction.
  • the leaf springs 11 and 12 are formed of, for example, resin, metal, fiber reinforced plastic (FRP), or the like.
  • the fiber contained in the fiber reinforced resin include glass fiber and carbon fiber.
  • the leaf springs 11 and 12 are formed of a fiber reinforced resin containing short fibers made of glass. The fibers are contained in the resin in a state of extending in the longitudinal direction of the leaf springs 11 and 12.
  • the main leaf spring 11 located above extends upward from the central portion to the end along the longitudinal direction and curves downward in a curved surface shape. doing.
  • the child leaf spring 12 located at the lower side extends downward from the central portion toward the end portion in the longitudinal direction and curves upward in a curved surface shape. doing.
  • the central portions of the main leaf spring 11 and the child leaf spring 12 in the longitudinal direction are in contact with each other and are laminated in the vertical direction.
  • a bolt B that penetrates each center of the plurality of leaf springs 11 and 12 in the vertical direction is provided, and the nut N is screwed onto the bolt B to integrally fix the plurality of leaf springs 11 and 12. .
  • a straight line extending in the vertical direction and passing through the central portions of the plurality of leaf springs 11 and 12 is referred to as a central axis O.
  • mounting cylinder portions 11a that open in the plate width direction orthogonal to the vertical direction and the longitudinal direction are provided.
  • the leaf spring device 1 is connected to the vehicle body or the like via the mounting cylinder portion 11a.
  • the main leaf spring 11 and the child leaf spring 12 are provided one by one, but for example, a plurality of springs may be provided one by one.
  • the surface of one of the two leaf springs 11 and 12 adjacent to each other in the vertical direction is on the surface of the other leaf spring 11.
  • a regulation protrusion 14 inserted into the recessed portion 13 formed in the above is provided.
  • the regulating protrusion 14 and the recessed portion 13 are provided at the central portion of the leaf springs 11 and 12 in the longitudinal direction.
  • the recessed portion 13 is larger than the regulating protrusion 14.
  • the regulation protrusion 14 and the recessed portion 13 may be provided over the entire length of the leaf springs 11 and 12 in the longitudinal direction.
  • the recessed portion 13 is formed on the lower surface of the main leaf spring 11, and the regulating protrusion 14 is formed on the upper surface of the child leaf spring 12.
  • the recessed portion 13 may be formed on the upper surface of the child leaf spring 12, and the regulating protrusion 14 may be provided on the lower surface of the main leaf spring 11.
  • the regulation protrusion 14 may be formed of the same material as the material forming the child leaf spring 12, or may be formed of a different material.
  • the regulation protrusion 14 may be separate from the child leaf spring 12. When the regulating protrusion 14 is provided separately from the child leaf spring 12, the regulating protrusion 14 and the child leaf spring 12 may be fixed by adhesion or fitting.
  • the material of the regulating protrusion 14 includes, for example, resin, metal, or fiber reinforced plastic (FRP).
  • the recessed portion 13 may be separate from the main leaf spring 11.
  • the recessed portion 13 and the main leaf spring 11 may be fixed by adhesion or fitting.
  • examples of the material of the recessed portion 13 include resin, metal, or fiber reinforced plastic (FRP).
  • the longitudinal directions of the regulating protrusions 14 and the recesses 13 coincide with the longitudinal directions of the leaf springs 11 and 12.
  • the regulation protrusion 14 and the recess 13 each have a rectangular shape when viewed from the vertical direction.
  • the central portions of the regulating protrusions 14 and the recessed portions 13 when viewed from the vertical direction coincide with the central portions of the plurality of leaf springs 11 and 12.
  • both end edges in the longitudinal direction of each of the regulation protrusion 14 and the recessed portion 13 may exhibit a curved shape of a protrusion toward the outside in the longitudinal direction when viewed from the vertical direction. Further, the width in the plate width direction of both ends in the longitudinal direction in each of the regulation protrusion 14 and the recessed portion 13 may be narrowed toward the outside in the longitudinal direction.
  • the regulation protrusion 14 includes a first side surface 21 and a second side surface 22 that face the plate width direction and extend in the longitudinal direction.
  • the first side surface 21 and the second side surface 22 are located on both sides of the central axis O in the plate width direction when viewed from the vertical direction.
  • the regulation protrusion 14 is formed in a rectangular parallelepiped shape, connects the upper end portions of the first side surface 21 and the second side surface 22, and includes an upper end surface 14a facing upward. Both end faces 14b in the longitudinal direction of the regulation protrusion 14 extend straight in the vertical direction.
  • the regulating projection 14 does not have to have the upper end surface 14a, and the both end surfaces 14b of the regulating projection 14 in the longitudinal direction have, for example, the length of the regulating projection 14 as it goes upward from the upper surface of the child leaf spring 12. May extend inward in the longitudinal direction to shorten.
  • the regulation protrusion 14 is not limited to the rectangular parallelepiped shape and may be appropriately changed.
  • the recessed portion 13 includes a third side surface 23 and a fourth side surface 24 that are oriented in the plate width direction and extend in the longitudinal direction.
  • the third side surface 23 and the fourth side surface 24 face each other with the regulation protrusion 14 sandwiched in the plate width direction.
  • the internal space of the recessed portion 13 is formed in a rectangular parallelepiped shape, and the recessed portion 13 connects the upper end portions of the third side surface 23 and the fourth side surface 24 to each other and faces downward. It has. Both end faces 13b in the longitudinal direction of the recess 13 extend straight in the vertical direction.
  • the recessed portion 13 does not have to have an upper end surface 13a, and both end faces 13b in the longitudinal direction of the recessed portion 13 have, for example, the length of the recessed portion 13 as it goes upward from the lower surface of the main leaf spring 11. May extend inward in the longitudinal direction so as to shorten.
  • the first side surface 21 of the regulation protrusion 14 and the third side surface 23 of the recessed portion 13 face each other in the plate width direction
  • the second side surface 22 of the regulation protrusion 14 and the fourth side surface 24 of the recessed portion 13 have a plate width. They face each other in the direction.
  • the central portions of the first side surface 21 and the third side surface 23 in the longitudinal direction are in contact with each other or close to each other in the plate width direction.
  • the central portions of the second side surface 22 and the fourth side surface 24 in the longitudinal direction are in contact with each other or close to each other in the plate width direction.
  • the upper end surface 14a of the regulation protrusion 14 is in contact with or close to the upper end surface 13a of the recessed portion 13. In the present embodiment, as shown in FIG.
  • the central portions of the first side surface 21 and the third side surface 23 in the longitudinal direction are close to each other in the plate width direction.
  • the central portions of the second side surface 22 and the fourth side surface 24 in the longitudinal direction are close to each other in the plate width direction.
  • the upper end surfaces 14a and 13a of the regulation protrusion 14 and the recessed portion 13 are in contact with each other.
  • the first side surface 21 and the third side surface 23 have planes that are close to each other, but they may have curved surfaces that are close to each other.
  • the second side surface 22 and the fourth side surface 24 have planes close to each other, they may have curved surfaces close to each other.
  • the width of the regulating protrusion 14 in the plate width direction becomes narrower as the distance from the upper surface of the child leaf spring 12 on which the regulating protrusion 14 is formed increases. That is, the first side surface 21 and the second side surface 22 extend inward in the plate width direction so as to approach each other from the upper surface of the child leaf spring 12 upward.
  • the width of the recessed portion 13 in the plate width direction becomes narrower as the recessed portion 13 is formed upward from the lower surface of the main leaf spring 11. That is, the third side surface 23 and the fourth side surface 24 extend inward in the plate width direction so as to approach each other from the lower surface of the main leaf spring 11 upward.
  • a first side surface of one of the first side surface 21 and the third side surface 23 is separated from the other side surface in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • An inclined surface 16 is formed.
  • the first inclined surface 16 is provided over the entire area between the central portion in the longitudinal direction and the end portion 23a in the first direction X of the third side surface 23 of the recessed portion 13. ..
  • the end portion 23a of the first direction X on the third side surface 23 extends straight along the longitudinal direction.
  • one of the other side surfaces is directed from the central portion along the longitudinal direction toward the second direction Y opposite to the first direction X.
  • a second inclined surface 17 is formed so as to be separated from the side surface in the plate width direction.
  • the second inclined surface 17 is provided over the entire area between the central portion in the longitudinal direction and the end portion 24a in the second direction Y of the fourth side surface 24 of the recessed portion 13. ..
  • the end portion 24a in the second direction Y on the fourth side surface 24 extends straight along the longitudinal direction.
  • the inclination angle ⁇ 1 of the first inclined surface 16 with respect to the longitudinal direction and the inclination angle ⁇ 2 of the second inclined surface 17 with respect to the longitudinal direction are the same as each other.
  • the leaf springs 11 and 12 adjacent to each other in the vertical direction rotate relative to each other around the central axis O, the surface contact between the first side surface 21 and the first inclined surface 16 of the regulation projection 14 and the regulation projection 14 Surface contact between the second side surface 22 and the second inclined surface 17 occurs at the same time.
  • the inclination angles ⁇ 1 and ⁇ 2 may be different from each other.
  • a third side surface of one of the first side surface 21 and the third side surface 23 is separated from the other side surface in the plate width direction from the central portion toward the second direction Y along the longitudinal direction.
  • An inclined surface 18 is formed.
  • the third inclined surface 18 is provided over the entire area between the central portion in the longitudinal direction and the end portion 23b in the second direction Y of the third side surface 23 of the recessed portion 13. ..
  • the end portion 23b of the third side surface 23 in the second direction Y extends straight along the longitudinal direction.
  • a fourth side surface of one of the second side surface 22 and the fourth side surface 24 is separated from the other side surface in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • An inclined surface 19 is formed.
  • the fourth inclined surface 19 is provided over the entire area between the central portion in the longitudinal direction and the end portion 24b in the first direction X of the fourth side surface 24 of the recessed portion 13. ..
  • the end portion 24b of the first direction X on the fourth side surface 24 extends straight along the longitudinal direction.
  • the inclination angle ⁇ 3 of the third inclined surface 18 with respect to the longitudinal direction and the inclination angle ⁇ 4 of the fourth inclined surface 19 with respect to the longitudinal direction are the same as each other.
  • the leaf springs 11 and 12 adjacent to each other in the vertical direction rotate relative to each other around the central axis O, the surface contact between the first side surface 21 and the third inclined surface 18 of the regulation projection 14 and the regulation projection 14 Surface contact between the second side surface 22 and the fourth inclined surface 19 occurs at the same time.
  • the inclination angles ⁇ 3 and ⁇ 4 may be different from each other.
  • ⁇ 3 and the inclination angle ⁇ 4 of the fourth inclined surface 19 with respect to the longitudinal direction are the same as each other.
  • the inclination angles ⁇ 1 and ⁇ 2 of the first inclined surface 16 and the second inclined surface 17 with respect to the longitudinal direction and the inclination angles ⁇ 3 of the third inclined surface 18 and the fourth inclined surface 19 with respect to the longitudinal direction are ⁇ 3. , ⁇ 4 and may be different from each other.
  • the first side surface 21 and the second side surface 22 of the regulation protrusion 14 extend straight along the longitudinal direction over the entire area.
  • the third side surface 23 and the fourth side surface 24 of the recessed portion 13 are separated from each other so that the width of the recessed portion 13 increases from the central portion toward the end portions 23a, 23b, 24a, and 24b along the longitudinal direction. ing.
  • a connecting portion 25 for connecting the first inclined surface 16 and the third inclined surface 18 without a step is provided at the central portion in the longitudinal direction on the third side surface 23 of the recessed portion 13.
  • the connecting portion 25 is formed in a curved surface shape that protrudes inward in the plate width direction.
  • a connecting portion 26 for connecting the second inclined surface 17 and the fourth inclined surface 19 without a step is provided at the central portion of the fourth side surface 24 of the recessed portion 13 in the longitudinal direction.
  • the connecting portion 26 is formed in a curved surface shape that protrudes inward in the plate width direction.
  • the radii of curvature r of the connecting portions 25 and 26 are the same as each other when viewed from the vertical direction, but they may be different from each other.
  • the first inclined surface 16, the third inclined surface 18, and the connecting portion 25 as a whole may exhibit a single or inflection arc shape.
  • the entire second inclined surface 17, the fourth inclined surface 19, and the connecting portion 26 may exhibit a single or inflection arc shape.
  • the regulation protrusion 14 is provided on the surface of one of the two leaf springs 11 and 12 adjacent to each other in the vertical direction.
  • a recess 13 is formed on the surface of either one of the leaf springs 11, and the regulation protrusion 14 is inserted into the recess 13. Therefore, when the leaf springs 11 and 12 adjacent to each other in the vertical direction rotate relative to each other around the central axis O, the first side surface 21 of the regulation protrusion 14 and the third side surface 23 of the recess 13 come into contact with each other and are regulated. The second side surface 22 of the protrusion 14 and the fourth side surface 24 of the recess 13 come into contact with each other.
  • the relative rotation of the leaf springs 11 and 12 can be regulated. Further, as compared with the conventional leaf spring device in which the recessed portion 13 and the regulating protrusion 14 are not provided, the bending rigidity of the portion of the leaf springs 11 and 12 in which the recessed portion 13 and the regulating protrusion 14 are provided can be improved. it can. Further, in the conventional leaf spring device in which the recess 13 and the regulation protrusion 14 are not provided, the neutral axis of each leaf spring of the leaf spring device is located at the center of the leaf spring in the vertical direction. In the present embodiment, by providing the recessed portion 13 and the regulating protrusion 14, the positions of the neutral shafts C1 and C2 of the leaf springs 11 and 12 can be moved as shown in FIG.
  • the leaf springs can be moved. It is possible to change the stress ratio of tension and compression generated when the device 1 functions in the vertical direction. That is, the stress can be optimized by forming the recessed portion 13 and the regulating protrusion 14, and the durability of the leaf spring device 1 in the vertical direction can be improved.
  • one of the first side surface 21 and the third side surface 23 is separated from the other side surface in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • the first inclined surface 16 is formed.
  • a second inclined surface 17 is formed which is separated from the side surface in the plate width direction. Therefore, when the leaf springs 11 and 12 adjacent to each other in the vertical direction rotate relative to each other around the central axis O, the first side surface 21 of the regulation protrusion 14 and the third side surface 23 of the recessed portion 13 form the first inclined surface 16.
  • the second side surface 22 of the regulation protrusion 14 and the fourth side surface 24 of the recessed portion 13 are in surface contact with each other by the second inclined surface 17. As a result, it becomes possible to suppress the occurrence of a portion where stress is concentrated on the first to fourth side surfaces 21 to 24, and durability can be ensured.
  • first inclined surface 16 is formed on one of the first side surface 21 and the third side surface 23, along the longitudinal direction from the central portion toward the first direction X, and the other side surface. It is formed so as to be separated from the plate width direction.
  • the second inclined surface 17 is formed on one of the second side surface 22 and the fourth side surface 24 from the central portion along the longitudinal direction and from the other side surface in the second direction Y. It is formed so as to be separated in the plate width direction. Therefore, except when the leaf springs 11 and 12 come into contact with each other when they rotate relative to each other, the first side surface 21 and the third side surface 23 are not in contact with each other except for the central portion in the longitudinal direction, and the second side surface 21 and the third side surface 23 are not in contact with each other.
  • the side surface 22 and the fourth side surface 24 are not in contact with each other except at the central portion in the longitudinal direction. Therefore, it is possible to reduce the occurrence of friction due to the contact between the leaf springs 11 and 12, and the durability of the leaf spring device 1 is improved.
  • the longitudinal directions of the regulating protrusions 14 and the recesses 13 coincide with the longitudinal directions of the leaf springs 11 and 12. Therefore, when a load is applied to the leaf spring device 1 and the plurality of leaf springs 11 and 12 are flexed and deformed in the vertical direction, the longitudinal directions of the regulating protrusion 14 and the recessed portion 13 are the leaf widths of the leaf springs 11 and 12, respectively. Compared with the configuration extending in the direction, the regulation protrusion 14 can be made more difficult to come off from the recessed portion 13.
  • the regulation protrusion 14 and the recessed portion 13 are provided between the two leaf springs 11 and 12 adjacent to each other in the vertical direction. Therefore, it is possible to achieve the above-mentioned effects without causing a protruding portion with respect to the plurality of leaf springs 11 and 12, and it is possible to prevent the leaf spring device 1 from being bulky.
  • the leaf springs 11 and 12 adjacent to each other in the vertical direction rotate relative to each other around the central axis O, the first side surface 21 of the regulation protrusion 14 and the third side surface 23 of the recess 13 are in contact with each other, and the regulation protrusion 14
  • the second side surface 22 and the fourth side surface 24 of the recessed portion 13 come into contact with each other, it is possible to reliably suppress the occurrence of a portion where stress is concentrated on the first to fourth side surfaces 21 to 24.
  • the first to fourth inclined surfaces 16 to 19 are provided. Therefore, regardless of the rotation direction around the central axis O of the leaf springs 11 and 12 adjacent to each other in the vertical direction, the first side surface 21 of the regulation protrusion 14 and the third side surface 23 of the recessed portion 13 are brought into surface contact with each other and regulated.
  • the second side surface 22 of the protrusion 14 and the fourth side surface 24 of the recess 13 can be brought into surface contact with each other. As a result, it is possible to reliably suppress the occurrence of a portion where stress is concentrated on the first to fourth side surfaces 21 to 24.
  • the leaf springs 11 and 12 adjacent to each other in the vertical direction rotate relative to each other around the central axis O, the first side surface 21 of the regulation protrusion 14 and the third side surface 23 of the recess 13 are in contact with each other, and the regulation protrusion 14
  • the second side surface 22 and the fourth side surface 24 of the recessed portion 13 come into contact with each other, it is possible to reliably suppress the occurrence of a portion where stress is concentrated on the first to fourth side surfaces 21 to 24.
  • the inclination angle ⁇ 1 of the first inclined surface 16 with respect to the longitudinal direction When viewed from the vertical direction, the inclination angle ⁇ 1 of the first inclined surface 16 with respect to the longitudinal direction, the inclination angle ⁇ 2 of the second inclined surface 17 with respect to the longitudinal direction, the inclination angle ⁇ 3 of the third inclined surface 18 with respect to the longitudinal direction, and the longitudinal direction.
  • the inclination angle ⁇ 4 of the fourth inclined surface 19 with respect to the above is the same as each other. Therefore, it is possible to make each load applied to the first to fourth side surfaces 21 to 24 equal regardless of the rotation direction around the central axis O of the leaf springs 11 and 12 adjacent to each other in the vertical direction, and the durability The sex can be surely secured.
  • the width of the regulating protrusion 14 in the plate width direction becomes narrower as the distance from the upper surface of the child leaf spring 12 on which the regulating protrusion 14 is formed increases, and the width of the recessed portion 13 in the plate width direction is formed by the recessed portion 13. It becomes narrower as it moves upward from the lower surface of the main leaf spring 11. Therefore, it is possible to secure a wider flat area of each of the first to fourth side surfaces 21 to 24 as compared with the configuration in which the widths of the regulating protrusion 14 and the recessed portion 13 are the same over the entire area in the vertical direction. Become.
  • the leaf spring device 1A of the present embodiment is different from the leaf spring device 1 of the first embodiment in the configuration of the regulation protrusion 14. As shown in FIG. 4, in the present embodiment, the width of the regulation protrusion 14 in the plate width direction becomes wider from the central portion to both ends in the longitudinal direction when viewed from the vertical direction.
  • the direction from the central portion to the first direction X along the longitudinal direction passes through the central axis O and from the virtual line V along the longitudinal direction in the plate width direction.
  • a fifth inclined surface 31 to be separated is formed.
  • the fifth inclined surface 31 faces the first inclined surface 16 formed on the third side surface 23 of the recessed portion 13 in the plate width direction.
  • the inclination angle ⁇ 1 of the first inclined surface 16 with respect to the longitudinal direction is larger than the inclination angle ⁇ 5 of the fifth inclined surface 31 with respect to the longitudinal direction.
  • the first inclined surface 16 is formed so as to be separated from the first side surface 121 (fifth inclined surface 31) in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • the fifth inclined surface 31 is formed so as to be separated from the third side surface 23 (first inclined surface 16) in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • a sixth inclined surface 32 is formed on the second side surface 122 of the regulation protrusion 14 so as to move from the central portion to the second direction Y along the longitudinal direction and to be separated from the virtual line V in the plate width direction.
  • the sixth inclined surface 32 faces the second inclined surface 17 formed on the fourth side surface 24 of the recessed portion 13 in the plate width direction.
  • the inclination angle ⁇ 2 of the second inclined surface 17 with respect to the longitudinal direction is larger than the inclination angle ⁇ 6 of the sixth inclined surface 32 with respect to the longitudinal direction. Therefore, the second inclined surface 17 is formed so as to be separated from the second side surface 122 (sixth inclined surface 32) in the plate width direction from the central portion toward the second direction Y along the longitudinal direction.
  • the sixth inclined surface 32 is formed so as to be separated from the fourth side surface 24 (second inclined surface 17) in the plate width direction from the central portion toward the second direction Y along the longitudinal direction.
  • a seventh inclined surface 33 is formed, which is separated from the virtual line V in the plate width direction from the central portion toward the second direction Y along the longitudinal direction.
  • the seventh inclined surface 33 faces the third inclined surface 18 formed on the third side surface 23 of the recessed portion 13 in the plate width direction.
  • the inclination angle ⁇ 3 of the third inclined surface 18 with respect to the longitudinal direction is larger than the inclination angle ⁇ 7 of the seventh inclined surface 33 with respect to the longitudinal direction. Therefore, the third inclined surface 18 is formed so as to be separated from the first side surface 121 (seventh inclined surface 33) in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • the seventh inclined surface 33 is formed so as to be separated from the third side surface 23 (third inclined surface 18) in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • an eighth inclined surface 34 is formed, which is separated from the virtual line V in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • the eighth inclined surface 34 faces the fourth inclined surface 19 formed on the fourth side surface 24 of the recessed portion 13 in the plate width direction.
  • the inclination angle ⁇ 4 of the fourth inclined surface 19 with respect to the longitudinal direction is larger than the inclination angle ⁇ 8 of the eighth inclined surface 34 with respect to the longitudinal direction. Therefore, the fourth inclined surface 19 is formed so as to be separated from the second side surface 122 (eighth inclined surface 34) in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • the eighth inclined surface 34 is formed so as to be separated from the fourth side surface 24 (fourth inclined surface 19) in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • the inclination angle ⁇ 5 of the fifth inclined surface 31 with respect to the longitudinal direction When viewed from the vertical direction, the inclination angle ⁇ 6 of the sixth inclined surface 32 with respect to the longitudinal direction, and the inclination angle ⁇ 7 of the seventh inclined surface 33 with respect to the longitudinal direction.
  • the inclination angle ⁇ 8 of the eighth inclined surface 34 with respect to the longitudinal direction is the same as each other.
  • the leaf spring device 1A of the present embodiment it is possible to achieve the same effect as that of the leaf spring device 1 of the first embodiment. Further, in addition to the recessed portion 13 being provided with the first to fourth inclined surfaces 16 to 19, the regulating projection 14 is provided with the fifth to eighth inclined surfaces 31 to 34. With this configuration, the contact area can be large and the direction in which the force is applied can be dispersed in the leaf width direction and the longitudinal direction while maintaining the effect of regulating the relative rotation of the leaf springs 11 and 12. Therefore, the durability of the leaf spring device 1A can be further improved.
  • the leaf spring device 1B of the present embodiment is different from the leaf spring device 1 of the first embodiment in the configuration of the recess 13 and the regulation protrusion 14. As shown in FIG. 5, in the present embodiment, the width of the recessed portion 13 in the plate width direction becomes narrower from the central portion to both end portions in the longitudinal direction when viewed from the vertical direction. Further, the width of the regulation protrusion 14 in the plate width direction becomes narrower from the central portion to both end portions in the longitudinal direction.
  • the virtual line V passing through the central axis O and along the longitudinal direction is formed in the plate width direction.
  • the approaching first inclined surface 216 is formed.
  • a fifth inclined surface 231 approaching the virtual line V in the plate width direction is formed on the first side surface 221 of the regulation protrusion 14 from the central portion toward the first direction X along the longitudinal direction.
  • the fifth inclined surface 231 faces the first inclined surface 216 in the plate width direction.
  • the first inclined surface 216 is formed so as to be separated from the first side surface 221 (fifth inclined surface 231) in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • the fifth inclined surface 231 is formed so as to be separated from the third side surface 223 (first inclined surface 216) in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • a second inclined surface 217 that approaches the virtual line V in the plate width direction is formed on the fourth side surface 224 of the recessed portion 13 from the central portion toward the second direction Y along the longitudinal direction.
  • a sixth inclined surface 232 is formed on the second side surface 222 of the regulation protrusion 14 so as to approach the virtual line V in the plate width direction from the central portion toward the second direction Y along the longitudinal direction.
  • the sixth inclined surface 232 faces the second inclined surface 217 in the plate width direction.
  • the inclination angle ⁇ 22 of the second inclined surface 217 with respect to the longitudinal direction is smaller than the inclination angle ⁇ 26 of the sixth inclined surface 232 with respect to the longitudinal direction.
  • the second inclined surface 217 is formed so as to be separated from the second side surface 222 (sixth inclined surface 232) in the plate width direction from the central portion toward the second direction Y along the longitudinal direction.
  • the sixth inclined surface 232 is formed so as to be separated from the fourth side surface 224 (second inclined surface 217) in the plate width direction from the central portion toward the second direction Y along the longitudinal direction.
  • a third inclined surface 218 is formed on the third side surface 223 of the recessed portion 13 so as to approach the virtual line V in the plate width direction from the central portion toward the second direction Y along the longitudinal direction.
  • a seventh inclined surface 233 is formed on the first side surface 221 of the regulation protrusion 14 so as to approach the virtual line V in the plate width direction from the central portion toward the second direction Y along the longitudinal direction.
  • the seventh inclined surface 233 faces the third inclined surface 218 in the plate width direction.
  • the third inclined surface 218 is formed so as to be separated from the first side surface 221 (seventh inclined surface 233) in the plate width direction from the central portion toward the second direction Y along the longitudinal direction.
  • the seventh inclined surface 233 is formed so as to be separated from the third side surface 223 (third inclined surface 218) in the plate width direction from the central portion toward the second direction Y along the longitudinal direction.
  • a fourth inclined surface 219 is formed on the fourth side surface 224 of the recessed portion 13 so as to approach the virtual line V in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • An eighth inclined surface 234 that approaches the virtual line V in the plate width direction is formed on the second side surface 222 of the regulation protrusion 14 from the central portion toward the first direction X along the longitudinal direction.
  • the eighth inclined surface 234 faces the fourth inclined surface 219 in the plate width direction.
  • the fourth inclined surface 219 is formed so as to be separated from the second side surface 222 (eighth inclined surface 234) in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • the eighth inclined surface 234 is formed so as to be separated from the fourth side surface 224 (fourth inclined surface 219) in the plate width direction from the central portion toward the first direction X along the longitudinal direction.
  • the inclination angle ⁇ 24 of the fourth inclined surface 219 with respect to the longitudinal direction is the same as each other.
  • the inclination angle ⁇ 28 of the eighth inclined surface 234 with respect to the longitudinal direction is the same as each other.
  • the leaf spring device 1B of the present embodiment it is possible to achieve the same action and effect as the leaf spring device 1 of the first embodiment.
  • the recessed portion 13 is provided with the first to fourth inclined surfaces 216 to 219
  • the regulation projection 14 is provided with the fifth to eighth inclined surfaces 231 to 234.
  • two sets of the recessed portion 13 and the regulating protrusion 14 are arranged in the leaf width direction.
  • the configuration of the recessed portion 13 and the regulating protrusion 14 of the present embodiment is the same as that of the first embodiment.
  • the recess 13 and the regulation protrusion 14 of the second or third embodiment may be used.
  • the pair of the two recesses 13 and the regulation protrusion 14 is arranged so as to sandwich the central axis O.
  • the pair of the two recesses 13 and the regulation protrusion 14 is provided point-symmetrically with respect to the central axis O.
  • the leaf spring device 1C of the present embodiment it is possible to achieve the same action and effect as the leaf spring device 1 of the first embodiment. Further, by providing the two regulating protrusions 14, the stress is dispersed and the stress in each regulating protrusion 14 is relaxed, so that the durability of the leaf spring device 1C can be improved. Further, by increasing the contact area, the effect of regulating the relative rotation of the leaf springs 11 and 12 can be improved.
  • the number of regulation protrusions 14 is not limited to two, and three or more may be provided.
  • the first inclined surface 16 and the third inclined surface 18 are formed on the third side surface 23 of the recessed portion 13, and the second inclined surface 17 and the fourth inclined surface 19 are formed on the recessed portion 13.
  • the configuration formed on the fourth side surface 24 is shown.
  • at least one of the first inclined surface 16 and the third inclined surface 18 is formed on the first side surface 21 of the regulation protrusion 14, and at least one of the second inclined surface 17 and the fourth inclined surface 19 is formed. It may be formed on the second side surface 22 of the regulation protrusion 14.
  • the first inclined surface 16 may be formed on the first side surface 21 of the regulation protrusion 14, and the fourth inclined surface 19 may be formed on the second side surface 22 of the regulation protrusion 14.
  • the second inclined surface 17 may be formed on the second side surface 22 of the regulation protrusion 14, and the third inclined surface 18 may be formed on the first side surface 21 of the regulation protrusion 14.
  • a configuration having no third inclined surface 18 and a fourth inclined surface 19 may be adopted.
  • the regulation protrusion 14 and the recessed portion 13 are provided at an arbitrary position between the central portion of the leaf springs 11 and 12 in the longitudinal direction and the edges of both ends of the leaf springs 11 and 12 in the longitudinal direction. It may be provided so as to extend.
  • the force in the lateral direction that is, the leaf width direction
  • the strength of the leaf springs 11 and 12 is improved.
  • the overall lateral rigidity of the leaf spring device 1 is improved.
  • the thickness of the leaf springs 11 and 12 (that is, the length in the vertical direction) is increased in order to reduce the width of the leaf springs 11 and 12 in the leaf width direction, and the bending rigidity of the leaf springs 11 and 12 is improved. To do. As a result, the shear stress and bending stress at the central portions of the leaf springs 11 and 12 on which the bolts B are provided can be reduced, and the strength of the leaf spring device 1 is improved.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Springs (AREA)
PCT/JP2020/044143 2019-11-27 2020-11-27 板ばね装置 WO2021107070A1 (ja)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP20891567.8A EP4067688B1 (en) 2019-11-27 2020-11-27 Leaf spring device
CN202080081485.5A CN114746667B (zh) 2019-11-27 2020-11-27 板簧装置
KR1020227016526A KR20220078709A (ko) 2019-11-27 2020-11-27 판스프링 장치
JP2021561530A JP7209864B2 (ja) 2019-11-27 2020-11-27 板ばね装置
US17/779,660 US11927233B2 (en) 2019-11-27 2020-11-27 Leaf spring device
MX2022006157A MX2022006157A (es) 2019-11-27 2020-11-27 Dispositivo de suspension de ballesta.
CA3163112A CA3163112A1 (en) 2019-11-27 2020-11-27 Leaf spring device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-214204 2019-11-27
JP2019214204 2019-11-27

Publications (1)

Publication Number Publication Date
WO2021107070A1 true WO2021107070A1 (ja) 2021-06-03

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PCT/JP2020/044143 WO2021107070A1 (ja) 2019-11-27 2020-11-27 板ばね装置

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US (1) US11927233B2 (en])
EP (1) EP4067688B1 (en])
JP (1) JP7209864B2 (en])
KR (1) KR20220078709A (en])
CN (1) CN114746667B (en])
CA (1) CA3163112A1 (en])
MX (1) MX2022006157A (en])
WO (1) WO2021107070A1 (en])

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CN114746667B (zh) 2024-02-23
EP4067688A1 (en) 2022-10-05
JPWO2021107070A1 (en]) 2021-06-03
US11927233B2 (en) 2024-03-12
MX2022006157A (es) 2022-08-25
EP4067688B1 (en) 2024-09-25
JP7209864B2 (ja) 2023-01-20
US20220412420A1 (en) 2022-12-29
KR20220078709A (ko) 2022-06-10
EP4067688A4 (en) 2023-01-25
CA3163112A1 (en) 2021-06-03
CN114746667A (zh) 2022-07-12

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