WO2024204770A1 - 押圧ユニット - Google Patents

押圧ユニット Download PDF

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Publication number
WO2024204770A1
WO2024204770A1 PCT/JP2024/013199 JP2024013199W WO2024204770A1 WO 2024204770 A1 WO2024204770 A1 WO 2024204770A1 JP 2024013199 W JP2024013199 W JP 2024013199W WO 2024204770 A1 WO2024204770 A1 WO 2024204770A1
Authority
WO
WIPO (PCT)
Prior art keywords
leaf spring
pressing
connection portion
pair
spring portion
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.)
Ceased
Application number
PCT/JP2024/013199
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
孝充 佐野
才司 上津原
勝 今村
拓斗 鈴木
健雄 藤井
英正 臼井
洋介 吉澤
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.)
Honda Motor Co Ltd
NHK Spring Co Ltd
Original Assignee
Honda Motor Co Ltd
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 Honda Motor Co Ltd, NHK Spring Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP2025511689A priority Critical patent/JPWO2024204770A1/ja
Publication of WO2024204770A1 publication Critical patent/WO2024204770A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
    • F16F1/366—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers made of fibre-reinforced plastics, i.e. characterised by their special construction from such materials
    • F16F1/368—Leaf springs

Definitions

  • the present invention relates to a pressing unit.
  • This application claims priority based on Japanese Patent Application No. 2023-058292, filed on March 31, 2023, the contents of which are incorporated herein by reference.
  • a pressing unit has been known that includes a pair of pressing bodies that face each other in a first direction and a leaf spring portion that biases the pressing bodies in directions that move them away from each other in the first direction, and the leaf spring portion is curved so as to protrude in the first direction.
  • the conventional pressing unit had a problem in that it was difficult to ensure the durability of the leaf spring portion by suppressing the bending stress applied to the leaf spring portion when a pair of pressing bodies were brought closer to each other in the first direction, i.e., it was difficult to make the leaf spring portion less likely to sag.
  • the present invention provides a pressing unit that can ensure the durability of the leaf spring portion.
  • the pressing unit comprises a pair of pressing bodies facing each other in a first direction, and a leaf spring portion that biases the pressing bodies in a direction away from each other in the first direction, the leaf spring portion curved so as to protrude toward one of the pair of pressing bodies, a middle connection portion connected to one of the pressing bodies, and a pair of end connection portions connected to the other of the pair of pressing bodies and provided on both sides of the middle connection portion, the leaf spring portion being formed from fiber-reinforced resin.
  • the leaf spring portion is made of fiber-reinforced resin, the bending elastic modulus of the leaf spring portion is reduced compared to when it is made of a metal material, and the bending stress applied to the leaf spring portion when the pair of pressing bodies are brought closer to each other in the first direction can be reduced. This makes it possible to make the leaf spring portion less likely to sag, thereby ensuring the durability of the leaf spring portion. Since the leaf spring portion is formed from fiber reinforced resin, hysteresis loss can be reduced compared to when it is formed from only resin material.
  • the reinforcing fibers contained in the fiber-reinforced resin may extend in a second direction perpendicular to the first direction and in which the middle connection portion and the end connection portion are aligned, and the reinforcing fibers may extend continuously over the entire length of the leaf spring portion in the second direction.
  • the reinforcing fibers contained in the fiber-reinforced resin extend continuously over the entire length of the leaf spring portion in the second direction, which makes it possible to improve the spring constant and strength of the leaf spring portion against a load that moves the pair of pressing bodies toward each other in the first direction, and ensures the durability of the leaf spring portion.
  • the middle connection portion may have a curved shape that protrudes toward one of the pressing bodies when viewed in a vertical cross section along the first direction and in a second direction in which the middle connection portion and the end connection portion are aligned.
  • the middle connection portion has a curved protrusion toward one of the pressing bodies when viewed in the longitudinal section, it is possible to maintain the leaf spring portion in a three-point bending state without transitioning to a four-point bending state during the process in which the pair of pressing bodies approach each other in the first direction, and it is possible to prevent a sudden increase in the bending stress applied to the leaf spring portion during this process.
  • the thickness of the leaf spring portion may become thinner along the second direction from the middle connection portion to each of the pair of end connection portions.
  • the thickness of the leaf spring portion becomes thinner from the middle connection portion toward each of the pair of end connection portions along the second direction, so that in the process in which the pair of pressing bodies approach each other in the first direction, the leaf spring portion can be reliably maintained in a three-point bending state without transitioning to a four-point bending state, and it is possible to reliably prevent a sudden increase in the bending stress applied to the leaf spring portion during this process.
  • the reinforcing fibers contained in the fiber-reinforced resin may extend in the second direction, the reinforcing fibers may extend continuously over the entire length of the leaf spring portion in the second direction, and the volume content of the reinforcing fibers in the fiber-reinforced resin may increase from the middle connection portion toward each of the pair of end connection portions along the second direction.
  • the volume content of the reinforcing fibers contained in the fiber-reinforced resin increases from the middle connection part toward each of the pair of end connection parts along the second direction, so that in a leaf spring part in which the plate thickness decreases from the middle connection part toward each of the pair of end connection parts along the second direction, it is possible to provide the leaf spring part with reinforcing fibers that extend continuously over the entire length in the second direction, thereby reliably ensuring the durability of the leaf spring part.
  • the end connection portion has an end connection surface that abuts against the other pressing body, and on the front and back surfaces of the leaf spring portion that face the other pressing body, a portion that is located on the middle connecting portion side relative to the end connection surface may present a curved shape that protrudes toward the other pressing body when viewed in a vertical cross section along the second direction in which the middle connecting portion and the end connection portion are aligned, and along the first direction.
  • the portion that is connected to the end connection surface of the end connection portion and is located on the middle connection portion side presents a protruding curve toward the other pressing body when viewed in the vertical cross section. This makes it possible to suppress the sliding resistance that occurs between the leaf spring portion and the other pressing body when the pair of pressing bodies are brought closer to each other in the first direction, thereby suppressing hysteresis loss.
  • This invention ensures the durability of the leaf spring portion of the pressing unit.
  • FIG. 3 is a longitudinal cross-sectional view of a pressing unit according to an embodiment taken along a first direction and a second direction;
  • the pressing unit 1 includes a pair of pressing bodies 11a, 11b facing each other in the first direction Z, and a leaf spring portion 12 that biases the pressing bodies 11a, 11b in directions away from each other in the first direction Z.
  • the pressing unit 1 is applied to, for example, an all-solid-state battery, and is provided between pressed bodies such as solid-state battery cells adjacent to each other in the first direction Z, and biases these pressed bodies in the first direction Z.
  • the pressing bodies 11a and 11b are formed in a plate shape with the front and back surfaces facing the first direction Z.
  • the material and shape of the pressing bodies 11a and 11b are not limited and may be changed as appropriate as long as they function as the pressing bodies 11a and 11b, and may be composed of a single member or multiple members.
  • the leaf spring portion 12 is formed of a fiber-reinforced resin. Examples of reinforcing fibers contained in the fiber-reinforced resin include glass fiber and carbon fiber. In the illustrated example, the leaf spring portion 12 is formed of a fiber-reinforced resin containing glass fiber. The leaf spring portion 12 is formed in a plate shape with the front and back surfaces facing the first direction Z.
  • the leaf spring portion 12 is curved so as to protrude toward one of the pair of pressing bodies 11a, 11b.
  • the leaf spring portion 12 includes a middle connection portion 12a connected to one of the pressing bodies 11a, and a pair of end connection portions 12b connected to the other of the pair of pressing bodies 11a, 11b and provided on both sides of the middle connection portion 12a.
  • the direction perpendicular to the first direction Z and in which the middle connection portion 12a and the end connection portion 12b are aligned is referred to as the second direction X
  • the direction perpendicular to both the first direction Z and the second direction X is referred to as the third direction Y.
  • the middle connection portion 12a is provided at the center of the leaf spring portion 12 in the second direction X, over the entire area in the third direction Y.
  • the end connection portions 12b are provided at both ends of the leaf spring portion 12 in the second direction X, over the entire area in the third direction Y.
  • the middle connecting portion 12 a may be provided at a position shifted in the second direction X from the center of the leaf spring portion 12 in the second direction X.
  • the leaf spring portion 12 has a rectangular shape when viewed from the first direction Z, and of the two pairs of sides that define this rectangular shape, one pair of sides extends in the second direction X, and the remaining pair of sides extends in the third direction Y.
  • the leaf spring portion 12 is curved so as to present a protruding curved shape toward one pressing body 11a when viewed from the third direction Y.
  • the plate thickness of the leaf spring portion 12 becomes thinner along the second direction X from the central connecting portion 12a to each of the pair of end connecting portions 12b.
  • the middle connecting portion 12a has a curved shape protruding toward one pressing body 11a in a vertical cross section along the first direction Z and the second direction X.
  • the middle connecting portion 12a may be formed in a spherical shape protruding toward one of the pressing bodies 11a, or may extend linearly in the second direction X in the vertical cross-sectional view.
  • the end connection portion 12b has an end connection surface 12c that abuts against the other pressing body 11b. As the end connection portion 12b moves away from the middle connection portion 12a along the second direction X, it extends toward the other pressing body 11b along the first direction Z.
  • the end connection surfaces 12c of the end connection portion 12b are portions located at both ends in the second direction X of the outer edge that connects the front and back surfaces of the plate-shaped leaf spring portion 12 in the plate thickness direction.
  • the end connection portion 12b may be configured to extend outward in the second direction X (to the opposite side of the middle connection portion 12a) as it moves away from the middle connection portion 12a along the second direction X, and the end connection surfaces 12c may be both ends in the second direction X of the surface facing the other pressing body 11b among the front and back surfaces of the leaf spring portion 12.
  • the end connection portion 12b may be curved so as to protrude toward the other pressing body 11b, or may extend straight in the second direction X.
  • connection portion 12d On the front and back surfaces of the leaf spring portion 12, on the surface facing the other pressing body 11b, the connection portion 12d that is located on the middle connection portion 12a side (inside the second direction X) and connected to the end connection surface 12c presents a protruding curved shape toward the other pressing body 11b when viewed in the vertical cross section.
  • the connection portion 12d extends in the second direction X from the end connection surface 12c toward the middle connection portion 12a, and then extends in the first direction Z toward one of the pressing bodies 11a.
  • the reinforcing fibers 13 contained in the fiber-reinforced resin extend in the second direction X, and extend continuously over the entire length of the leaf spring portion 12 in the second direction X.
  • the volume content of the reinforcing fibers 13 in the fiber-reinforced resin increases along the second direction X from the middle connection portion 12a to each of the pair of end connection portions 12b.
  • the volume content of the reinforcing fibers 13 in the middle connection portion 12a is, for example, 40% or more, and the volume content of the reinforcing fibers 13 in the end connection portions 12b is, for example, 70% or less.
  • the leaf spring portion 12 is formed from fiber-reinforced resin, so that the bending elastic modulus of the leaf spring portion 12 is reduced compared to when it is formed from a metal material, and the bending stress applied to the leaf spring portion 12 when the pair of pressing bodies 11a, 11b are brought closer to each other in the first direction Z can be reduced.
  • This makes it possible to make the leaf spring portion 12 less likely to sag, thereby ensuring the durability of the leaf spring portion 12. Since the leaf spring portion 12 is formed from fiber reinforced resin, hysteresis loss can be suppressed compared to when it is formed from only a resin material.
  • the reinforcing fibers 13 contained in the fiber-reinforced resin extend continuously over the entire length of the leaf spring portion 12 in the second direction X, so that it is possible to improve the spring constant and strength of the leaf spring portion 12 against a load that moves the pair of pressing bodies 11a, 11b toward each other in the first direction Z, and the durability of the leaf spring portion 12 can be reliably ensured.
  • the middle connection portion 12a when viewed in the vertical cross section, has a curved shape that protrudes toward one of the pressing bodies 11a.
  • the middle connection portion 12a when the pair of pressing bodies 11a, 11b approach each other in the first direction Z, it is possible to maintain the leaf spring portion 12 in a three-point bending state without transitioning to a four-point bending state, and it is possible to prevent a sudden increase in the bending stress applied to the leaf spring portion 12 during this process.
  • the thickness of the leaf spring portion 12 becomes thinner along the second direction X from the middle connection portion 12a to each of the pair of end connection portions 12b. This makes it possible to reliably maintain the leaf spring portion 12 in a three-point bent state without transitioning to a four-point bent state as the pair of pressing bodies 11a, 11b approach each other in the first direction Z, and reliably prevents a sudden increase in the bending stress applied to the leaf spring portion 12 during this process.
  • the volume content of the reinforcing fibers 13 in the fiber-reinforced resin increases from the middle connection portion 12a to each of the pair of end connection portions 12b along the second direction X, so that the plate thickness of the leaf spring portion 12, which decreases from the middle connection portion 12a to each of the pair of end connection portions 12b along the second direction X, can be provided with reinforcing fibers 13 that extend continuously over the entire length of the leaf spring portion 12 in the second direction X, and the durability of the leaf spring portion 12 can be reliably ensured.
  • connection portion 12d located on the middle connection portion 12a side and connected to the end connection surface 12c presents a curved shape that protrudes toward the other pressing body 11b when viewed in the vertical cross section. Therefore, when the pair of pressing bodies 11a, 11b are brought closer to each other in the first direction Z, it is possible to suppress the sliding resistance that occurs between the leaf spring portion 12 and the other pressing body 11b, and hysteresis loss can be suppressed.
  • the reinforcing fibers 13 may extend in a direction intersecting the second direction X.
  • the reinforcing fibers 13 may extend intermittently in the second direction X over the entire length of the leaf spring portion 12 in the second direction X.
  • the plate thickness of the plate spring portion 12 is not limited to that of the above embodiment and may be appropriately changed, for example, so as to be uniform over the entire length in the second direction X.
  • the volume content of the reinforcing fibers 13 in the fiber reinforced resin is not limited to that in the above embodiment and may be changed as appropriate, for example, to be the same throughout the entire leaf spring portion 12 .
  • the connecting portion 12d is not limited to the above embodiment and may be appropriately modified, for example, to have a chamfered shape.
  • aspects of the present invention are as follows. ⁇ 1> A pair of pressing bodies facing each other in a first direction; a leaf spring portion that biases the pressing bodies in directions away from each other in the first direction, The leaf spring portion is curved so as to protrude toward one of the pair of pressing bodies, and includes a middle connection portion connected to the one pressing body, and a pair of end connection portions connected to the other of the pair of pressing bodies and provided on both sides of the middle connection portion, The pressing unit, wherein the leaf spring portion is formed from a fiber reinforced resin.
  • the reinforcing fibers contained in the fiber reinforced resin extend in a second direction perpendicular to the first direction and in which the middle connection portion and the end connection portion are aligned,
  • ⁇ 4> The pressing unit described in ⁇ 3>, wherein the thickness of the leaf spring portion becomes thinner from the middle connection portion to each of the pair of end connection portions along the second direction.
  • the reinforcing fibers included in the fiber reinforced resin extend in the second direction, The reinforcing fibers extend continuously over the entire length of the leaf spring portion in the second direction,
  • the end connection portion has an end connection surface that abuts against the other pressing body,
  • the present invention can be used in a pressing unit that includes a pair of pressing bodies that face each other in a first direction and a leaf spring portion that biases the pressing bodies in directions that move them away from each other in the first direction.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Springs (AREA)
PCT/JP2024/013199 2023-03-31 2024-03-29 押圧ユニット Ceased WO2024204770A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2025511689A JPWO2024204770A1 (https=) 2023-03-31 2024-03-29

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023058292 2023-03-31
JP2023-058292 2023-03-31

Publications (1)

Publication Number Publication Date
WO2024204770A1 true WO2024204770A1 (ja) 2024-10-03

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ID=92905990

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Application Number Title Priority Date Filing Date
PCT/JP2024/013199 Ceased WO2024204770A1 (ja) 2023-03-31 2024-03-29 押圧ユニット

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WO (1) WO2024204770A1 (https=)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54158562A (en) * 1978-05-26 1979-12-14 Gkn Group Services Ltd Leaf spring and its manufacture
JPS55126424A (en) * 1979-03-23 1980-09-30 Nissan Motor Co Ltd Preparation of fiber reinforced resin leaf spring
DE102020101198A1 (de) * 2020-01-20 2021-07-22 Ford Global Technologies Llc Verbundblattfedersystem mit progressiver Federcharakteristik und verbesserter Quersteifigkeit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54158562A (en) * 1978-05-26 1979-12-14 Gkn Group Services Ltd Leaf spring and its manufacture
JPS55126424A (en) * 1979-03-23 1980-09-30 Nissan Motor Co Ltd Preparation of fiber reinforced resin leaf spring
DE102020101198A1 (de) * 2020-01-20 2021-07-22 Ford Global Technologies Llc Verbundblattfedersystem mit progressiver Federcharakteristik und verbesserter Quersteifigkeit

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JPWO2024204770A1 (https=) 2024-10-03

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