JP7456955B2 - leaf spring device - Google Patents

leaf spring device Download PDF

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JP7456955B2
JP7456955B2 JP2021019802A JP2021019802A JP7456955B2 JP 7456955 B2 JP7456955 B2 JP 7456955B2 JP 2021019802 A JP2021019802 A JP 2021019802A JP 2021019802 A JP2021019802 A JP 2021019802A JP 7456955 B2 JP7456955 B2 JP 7456955B2
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leaf spring
spring body
fitting hole
longitudinal direction
vehicle
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JP2022122516A (en
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信次 飯野
孝充 佐野
勝 今村
孝徳 林
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NHK Spring Co Ltd
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NHK Spring Co Ltd
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Description

本発明は、板ばね装置に関するものである。 The present invention relates to a leaf spring device.

従来から、繊維強化樹脂製の板ばね本体と、板ばね本体の長手方向の両端部に１つずつ設けられた２つの目玉部と、を備え、板ばね本体が車軸を支持し、かつ目玉部が車体に取付けられて用いられる板ばね装置が知られている。 Conventionally, a leaf spring main body made of fiber-reinforced resin and two eye portions, one provided at each end in the longitudinal direction of the leaf spring body, have been provided, and the leaf spring body supports an axle and has two eye portions. A leaf spring device is known that is used by being attached to a vehicle body.

実開昭６０－１６７８２７号公報Japanese Utility Model Application Publication No. 60-167827

繊維強化樹脂製の板ばね本体は、一般に金属製の板ばね本体からの置換品であることから、両者で長さ等の寸法は変わらないため、前記従来の板ばね装置では、金属製と比べて板幅方向の曲げ剛性が低く、操縦安定性が低下するという問題があり、また、軽量化を図り、車両の足回り部分のスペースを広く確保することに改善の余地があった。 Fiber-reinforced resin leaf spring bodies are generally replacements for metal leaf spring bodies, so dimensions such as length are the same between the two. However, there was a problem in that the bending rigidity in the width direction of the plate was low, resulting in a decrease in handling stability.There was also room for improvement in reducing the weight and securing a wider space around the vehicle's suspension.

この発明は、このような事情を考慮してなされたもので、板幅方向の曲げ剛性を高め、軽量化を図り、車両の足回り部分のスペースを広く確保することができる板ばね装置を提供することを目的とする。 The present invention was made in consideration of these circumstances, and provides a leaf spring device that increases bending rigidity in the width direction of the leaf, reduces weight, and secures a wide space in the undercarriage of a vehicle. The purpose is to

前記課題を解決して、このような目的を達成するために、本発明の板ばね装置は、繊維強化樹脂製の板ばね本体と、前記板ばね本体の長手方向の両端部に１つずつ設けられた２つの目玉部と、を備え、前記目玉部に、前記板ばね本体の板幅方向に貫き、車体に取付けられた支持軸が嵌合される嵌合孔が形成され、前記板ばね本体における長手方向の中央部領域が車軸を支持し、かつ前記嵌合孔に前記支持軸が嵌合されて、前記板ばね本体に空車荷重が加えられた状態で、前記板ばね本体の上方に向けた最大撓み量をδ、前記板ばね本体の全長をＬ、前記板ばね本体の板厚をｈとしたときに、ｈ×δ／Ｌ２が、０．０００５以上０．００１５以下となる。 In order to solve the above problems and achieve such an object, the leaf spring device of the present invention includes a leaf spring body made of fiber reinforced resin, and one leaf spring body provided at each end in the longitudinal direction of the leaf spring body. a fitting hole is formed in the eyelet part in the plate width direction of the leaf spring body and into which a support shaft attached to the vehicle body is fitted; A central region in the longitudinal direction supports an axle, and when the support shaft is fitted into the fitting hole and an empty vehicle load is applied to the leaf spring body, the leaf spring body is directed upwardly. When the maximum amount of deflection is δ, the total length of the leaf spring body is L, and the thickness of the leaf spring body is h, h×δ/L 2 is 0.0005 or more and 0.0015 or less.

この発明によれば、板ばね本体における長手方向の中央部領域が車軸を支持し、かつ嵌合孔に支持軸が嵌合されて、板ばね本体に空車荷重が加えられた状態で、板ばね本体の上方に向けた最大撓み量をδ、板ばね本体の全長をＬ、板ばね本体の板厚をｈとしたときに、ｈ×δ／Ｌ２が、０．０００５以上となる。
したがって、繊維強化樹脂製の板ばね本体の長さが短く抑えられることとなり、板幅方向の曲げ剛性が高められるとともに、板ばね本体の軽量化を図りつつ、車両の足回り部分のスペースを広く確保することができる。
また、ｈ×δ／Ｌ２が０．００１５以下となるので、板ばね本体の長さが短くなり過ぎ、板ばね本体に生ずる応力が過度に高くなるのを抑えることが可能になり、耐久性を確保することができる。 According to this invention, the central region in the longitudinal direction of the leaf spring body supports the axle, the support shaft is fitted into the fitting hole, and the leaf spring is When the maximum amount of upward deflection of the main body is δ, the total length of the leaf spring body is L, and the plate thickness of the leaf spring body is h, h×δ/L 2 is 0.0005 or more.
Therefore, the length of the leaf spring body made of fiber-reinforced resin can be kept short, increasing the bending rigidity in the width direction of the leaf, reducing the weight of the leaf spring body, and widening the space around the vehicle's suspension. can be secured.
In addition, since h×δ/L 2 is 0.0015 or less, it is possible to prevent the length of the leaf spring body from becoming too short and the stress generated in the leaf spring body from becoming excessively high, which improves durability. can be ensured.

前記嵌合孔は、前記板ばね本体の長手方向の端部の下方に位置してもよい。 The fitting hole may be located below a longitudinal end of the leaf spring body.

この場合、嵌合孔が、板ばね本体の長手方向の端部の下方に位置しているので、嵌合孔が、板ばね本体の長手方向の外端縁から長手方向に張り出して位置している構成、および嵌合孔が、板ばね本体の上面から上方に張り出して位置している構成と比べて、板ばね本体が、嵌合孔の中心軸回りに回転しながら、上方に向けて撓み変形したときに、板ばね本体のうち、車軸を支持している長手方向の中央部領域が、車両進行方向に変位するのを抑制することができる。これにより、板ばね本体が上方に撓み変形する際に、車軸が車両進行方向に変位するのを抑制することが可能になり、操縦安定性を向上させること等ができる。 In this case, since the fitting hole is located below the longitudinal end of the leaf spring body, the fitting hole is located extending longitudinally from the outer edge of the leaf spring body in the longitudinal direction. The leaf spring body is bent upward while rotating around the center axis of the leaf spring body, compared to a configuration in which the leaf spring body is rotated around the center axis of the leaf spring body, and a configuration in which the fitting hole is positioned upwardly from the top surface of the leaf spring body. When the leaf spring body is deformed, it is possible to suppress the longitudinal center region of the leaf spring body that supports the axle from displacing in the vehicle traveling direction. This makes it possible to suppress displacement of the axle in the direction in which the vehicle travels when the leaf spring body bends upward, thereby improving steering stability.

前記目玉部は、前記板ばね本体の下面から下方に向けて突出した突出部を備え、前記突出部に前記嵌合孔が形成されてもよい。 The eye portion may have a protrusion that protrudes downward from the underside of the leaf spring body, and the fitting hole may be formed in the protrusion.

この場合、嵌合孔が、板ばね本体の下面から下方に向けて突出した突出部に形成されているので、板ばね本体が、嵌合孔の中心軸回りに回転しながら、上方に向けて撓み変形したときに、板ばね本体の長手方向の中央部領域が、車両進行方向に変位するのを確実に抑制することができる。 In this case, since the fitting hole is formed in a protrusion that projects downward from the lower surface of the leaf spring body, the plate spring body rotates around the central axis of the fitting hole and rotates upward. When the leaf spring body is bent and deformed, the longitudinal center region of the leaf spring body can be reliably prevented from being displaced in the vehicle traveling direction.

前記嵌合孔の中心軸を通り、かつ前記板ばね本体の上下面に直交する板厚方向に延びる直線は、前記板ばね本体と交差してもよい。 A straight line passing through the center axis of the fitting hole and extending in the thickness direction perpendicular to the upper and lower surfaces of the leaf spring body may intersect with the leaf spring body.

この場合、嵌合孔の中心軸を通り、かつ板ばね本体の板厚方向に延びる直線が、板ばね本体と交差しているので、板ばね本体の長手方向の中央部と、嵌合孔の中心軸と、の長手方向の距離が抑えられ、板ばね本体が、嵌合孔の中心軸回りに回転しながら、上方に向けて撓み変形したときに、板ばね本体の長手方向の中央部領域が、車両進行方向に変位するのを確実に小さく抑えることができる。 In this case, a straight line passing through the central axis of the fitting hole and extending in the thickness direction of the leaf spring body intersects the leaf spring body, so the longitudinal center of the leaf spring body and the fitting hole The longitudinal distance between the central axis and the central axis is suppressed, and when the leaf spring body rotates around the central axis of the fitting hole and bends upward, the central region of the leaf spring body in the longitudinal direction However, displacement in the direction of vehicle movement can be reliably suppressed.

この発明によれば、板幅方向の曲げ剛性を高め、軽量化を図り、車両の足回り部分のスペースを広く確保することができる。 According to this invention, the bending rigidity in the width direction of the plate can be increased, the weight can be reduced, and a wide space can be secured in the suspension area of the vehicle.

一実施形態の板ばね装置を車両に装着した状態を示す側面図である。FIG. 2 is a side view showing a state in which the leaf spring device of one embodiment is mounted on a vehicle. 一実施形態の板ばね装置の側面図である。It is a side view of the leaf spring device of one embodiment. 比較例１として示した板ばね装置の側面図である。FIG. 4 is a side view of a leaf spring device shown as a comparative example 1. 比較例２として示した板ばね装置の側面図である。3 is a side view of a leaf spring device shown as Comparative Example 2. FIG. 図２から図４に示す側面図を組み合わせた図である。5 is a combination of the side views shown in FIGS. 2 to 4. FIG.

以下、板ばね装置の一実施形態を、図１および図２を参照しながら説明する。
本実施形態の板ばね装置１は、板ばね本体１１、および２つの目玉部１２を備えている。板ばね装置１は、板ばね本体１１の長手方向が車両前後方向と一致した状態で、板ばね本体１１における長手方向の中央部領域が車軸Ｗを支持し、目玉部１２が車体Ｂ１に取付けられて用いられる。 Hereinafter, one embodiment of a leaf spring device will be described with reference to FIGS. 1 and 2.
The leaf spring device 1 of this embodiment includes a leaf spring main body 11 and two eye parts 12. In the leaf spring device 1, the central region of the leaf spring body 11 in the longitudinal direction supports the axle W, and the center portion 12 is attached to the vehicle body B1 in a state where the longitudinal direction of the leaf spring body 11 coincides with the longitudinal direction of the vehicle. It is used as

板ばね本体１１は、繊維強化樹脂（ＦＲＰ）により形成されている。繊維強化樹脂に含まれる繊維としては、例えばガラス繊維、および炭素繊維等が挙げられる。図示の例では、ガラス繊維を含有した繊維強化樹脂により形成されている。繊維は、板ばね本体１１の長手方向にほぼ延ばされた状態で、樹脂中に含有されている。 The leaf spring body 11 is made of fiber reinforced resin (FRP). Examples of the fibers contained in the fiber-reinforced resin include glass fibers and carbon fibers. In the illustrated example, it is made of fiber-reinforced resin containing glass fibers. The fibers are contained in the resin in a state where they are substantially extended in the longitudinal direction of the leaf spring body 11.

板ばね本体１１は、車両に装着される前は、図１に二点鎖線で示されるように、長手方向に沿って中央部領域から外側の端部に向かうに従い、上方に向けて延び、下方に向けて突の曲面状に湾曲し、前述のように車両に装着された状態で、図１に実線で示されるように、ほぼ平坦となっている。図１に二点鎖線で示されるように、板ばね本体１１は、車両に装着される前の状態で、上下方向および長手方向に直交する板幅方向から見て、単一の円弧形状を呈する。 Before being mounted on a vehicle, the leaf spring main body 11 extends upward along the longitudinal direction from the central region toward the outer ends, as shown by the two-dot chain line in FIG. It is curved in a convex curved shape toward , and is almost flat as shown by the solid line in FIG. 1 when mounted on a vehicle as described above. As shown by the two-dot chain line in FIG. 1, the leaf spring body 11 has a single arcuate shape when viewed from the plate width direction perpendicular to the vertical direction and the longitudinal direction before being mounted on a vehicle. .

２つの目玉部１２は、板ばね本体１１の長手方向の両端部に１つずつ設けられている。目玉部１２は、例えばアルミニウム合金等の金属材料で形成されている。図２に示されるように、目玉部１２には、板幅方向に貫き、車体Ｂ１に取付けられた支持軸Ｂ２が嵌合される嵌合孔１３が形成されている。２つの支持軸Ｂ２のうちの少なくとも１つは、板幅方向に延び、かつ支持軸Ｂ２より上方に位置する回転軸線を中心に、長手方向に揺動自在に支持されている。 The two eyeball portions 12 are provided one at each end of the leaf spring body 11 in the longitudinal direction. The eyeball portion 12 is made of a metal material such as an aluminum alloy, for example. As shown in FIG. 2, a fitting hole 13 is formed in the center portion 12, passing through the plate width direction, into which a support shaft B2 attached to the vehicle body B1 is fitted. At least one of the two support shafts B2 extends in the board width direction and is supported so as to be swingable in the longitudinal direction about a rotation axis located above the support shaft B2.

目玉部１２は、板ばね本体１１の下面から下方に向けて突出した突出部１４を備えている。突出部１４は、表裏面が板幅方向を向く板状に形成されている。突出部１４は、板幅方向から見て、板ばね本体１１の上下面に直交する板厚方向に長い長方形状を呈する。突出部１４には、板ばね本体１１の下面に向けて開口し、前記板厚方向に延びる雌ねじ部が形成されている。 The eyepiece portion 12 includes a protrusion portion 14 that protrudes downward from the lower surface of the leaf spring body 11. The protruding portion 14 is formed in a plate shape with front and back surfaces facing in the plate width direction. The protruding portion 14 has a rectangular shape that is long in the plate thickness direction perpendicular to the upper and lower surfaces of the leaf spring body 11 when viewed from the plate width direction. The protruding portion 14 is formed with a female screw portion that opens toward the lower surface of the leaf spring body 11 and extends in the plate thickness direction.

目玉部１２は、板ばね本体１１の上面に配置された上板部１５を備えている。なお、上板部１５および突出部１４は一体に形成されてもよい。上板部１５および板ばね本体１１に、前記板厚方向に貫く貫通孔が形成されており、各貫通孔に一体にボルト１７が挿入されている。ボルト１７の下部は、突出部１４の雌ねじ部に螺着されている。これにより、突出部１４が板ばね本体１１に固定されている。 The eyepiece portion 12 includes an upper plate portion 15 disposed on the upper surface of the leaf spring body 11. Note that the upper plate portion 15 and the protruding portion 14 may be formed integrally. Through holes penetrating in the plate thickness direction are formed in the upper plate portion 15 and the leaf spring body 11, and bolts 17 are integrally inserted into each through hole. The lower part of the bolt 17 is screwed into the female thread of the protrusion 14 . Thereby, the protrusion 14 is fixed to the leaf spring body 11.

突出部１４に嵌合孔１３が形成されており、嵌合孔１３は、板ばね本体１１の長手方向の端部の下方に位置している。嵌合孔１３は、突出部１４の下端部に形成されている。嵌合孔１３の中心軸Ｏは、板ばね本体１１における長手方向の外端縁１１ａより長手方向の外側に位置している。嵌合孔１３の中心軸Ｏを通り、かつ板ばね本体１１の板厚方向に延びる直線Ｘは、板ばね本体１１と交差している。嵌合孔１３に、車体Ｂ１の支持軸Ｂ２が中心軸Ｏ回りに相対回転可能に嵌合されている。図示の例では、嵌合孔１３にゴムブッシュ１６が嵌合されており、ゴムブッシュ１６内に支持軸Ｂ２が中心軸Ｏ回りに相対回転可能に嵌合されている。なお、ゴムブッシュ１６は設けなくてもよい。 A fitting hole 13 is formed in the protrusion 14 , and the fitting hole 13 is located below the longitudinal end of the leaf spring body 11 . The fitting hole 13 is formed at the lower end of the protrusion 14 . The center axis O of the fitting hole 13 is located on the outer side in the longitudinal direction of the outer end edge 11a of the leaf spring body 11 in the longitudinal direction. A straight line X passing through the central axis O of the fitting hole 13 and extending in the thickness direction of the leaf spring body 11 intersects with the leaf spring body 11 . A support shaft B2 of the vehicle body B1 is fitted into the fitting hole 13 so as to be relatively rotatable about the central axis O. In the illustrated example, a rubber bush 16 is fitted into the fitting hole 13, and a support shaft B2 is fitted into the rubber bush 16 so as to be relatively rotatable around the central axis O. Note that the rubber bush 16 may not be provided.

板ばね本体１１の下面における長手方向の中央部領域が車軸Ｗを支持し、かつ嵌合孔１３に支持軸Ｂ２が嵌合されて、板ばね本体１１に空車荷重が加えられた状態で、板ばね本体１１の上方に向けた最大撓み量をδ、板ばね本体１１の全長をＬ、板ばね本体１１の板厚をｈとしたときに、ｈ×δ／Ｌ２が、０．０００５以上０．００１５以下となる。
つまり、乗員および荷物が搭載されていない積載荷重が零の車両に、板ばね装置１が装着されている状態で、ｈ×δ／Ｌ２が、０．０００５以上０．００１５以下、好ましくは０．０００６以上０．００１４以下、さらに好ましくは０．０００７以上０．００１３以下となる。
最大撓み量δとは、板ばね本体１１において、車軸Ｗを支持している長手方向の中央部領域における上方に向けた撓み量のことである。
板ばね本体１１の全長Ｌとは、板ばね装置１が車両に装着される前の状態で、板ばね本体１１における板厚方向の中央部を、長手方向の全長にわたって通る曲線のうち、前記直線Ｘ同士の間に位置する部分におけるこの曲線に沿う長さのことである。
板ばね本体１１の板厚ｈとは、板ばね本体１１のなかで最も板厚の薄い部分における板厚のことである。 The central region in the longitudinal direction of the lower surface of the leaf spring main body 11 supports the axle shaft W, and the support shaft B2 is fitted into the fitting hole 13, and when the empty vehicle load is applied to the leaf spring main body 11, the plate When the maximum amount of upward deflection of the spring body 11 is δ, the total length of the leaf spring body 11 is L, and the plate thickness of the leaf spring body 11 is h, h×δ/L 2 is 0.0005 or more. It becomes .0015 or less.
In other words, when the leaf spring device 1 is attached to a vehicle with no passengers or luggage and a zero load, h×δ/L 2 is 0.0005 or more and 0.0015 or less, preferably 0. It is .0006 or more and 0.0014 or less, more preferably 0.0007 or more and 0.0013 or less.
The maximum amount of deflection δ is the amount of upward deflection in the central region of the leaf spring body 11 in the longitudinal direction that supports the axle W.
The total length L of the leaf spring body 11 is defined as the straight line among the curves that pass through the center of the leaf spring body 11 in the thickness direction over the entire length in the longitudinal direction, before the leaf spring device 1 is mounted on the vehicle. This is the length along this curve in the portion located between the X's.
The plate thickness h of the leaf spring body 11 is the plate thickness at the thinnest part of the leaf spring body 11.

図示の例では、板ばね装置１が車両に装着される前の状態で、板ばね本体１１の長手方向の中央部は、嵌合孔１３の中心軸Ｏより下方に位置している。なお、板ばね装置１が車両に装着される前の状態で、板ばね本体１１の長手方向の中央部は、嵌合孔１３の中心軸Ｏに対して、上方に位置してもよいし、上下方向の同じ位置に位置してもよい。 In the illustrated example, the central portion of the leaf spring body 11 in the longitudinal direction is located below the central axis O of the fitting hole 13 before the leaf spring device 1 is mounted on the vehicle. Note that before the leaf spring device 1 is mounted on a vehicle, the longitudinal center portion of the leaf spring body 11 may be located above the central axis O of the fitting hole 13, or They may be located at the same position in the vertical direction.

以上説明したように、本実施形態による板ばね装置１によれば、板ばね本体１１における長手方向の中央部領域が車軸Ｗを支持し、かつ嵌合孔１３に支持軸Ｂ２が嵌合されて、板ばね本体１１に空車荷重が加えられた状態で、板ばね本体１１の上方に向けた最大撓み量をδ、板ばね本体１１の全長をＬ、板ばね本体１１の板厚をｈとしたときに、ｈ×δ／Ｌ２が、０．０００５以上となる。
したがって、繊維強化樹脂製の板ばね本体１１の長さが短く抑えられることとなり、板幅方向の曲げ剛性が高められるとともに、板ばね本体１１の軽量化を図りつつ、車両の足回り部分のスペースを広く確保することができる。
また、ｈ×δ／Ｌ２が０．００１５以下となるので、板ばね本体１１の長さが短くなり過ぎ、板ばね本体１１に生ずる応力が過度に高くなるのを抑えることが可能になり、耐久性を確保することができる。 As explained above, according to the leaf spring device 1 according to the present embodiment, the central region in the longitudinal direction of the leaf spring body 11 supports the axle W, and the support shaft B2 is fitted into the fitting hole 13. , when the empty vehicle load is applied to the leaf spring body 11, the maximum amount of upward deflection of the leaf spring body 11 is δ, the total length of the leaf spring body 11 is L, and the plate thickness of the leaf spring body 11 is h. Sometimes h×δ/L 2 is 0.0005 or more.
Therefore, the length of the leaf spring body 11 made of fiber-reinforced resin can be kept short, and the bending rigidity in the plate width direction is increased, and while the weight of the leaf spring body 11 is reduced, the space for the undercarriage of the vehicle can be reduced. can be widely secured.
In addition, since h×δ/L 2 is 0.0015 or less, it is possible to prevent the length of the leaf spring body 11 from becoming too short and the stress generated in the leaf spring body 11 from becoming excessively high. Durability can be ensured.

嵌合孔１３が、板ばね本体１１の長手方向の端部の下方に位置しているので、図３に示されるような、嵌合孔１１３が、板ばね本体１１１の長手方向の外端縁１１ａから長手方向に張り出して位置している比較例１の板ばね装置１００、および、図４に示されるような、嵌合孔２１３が、板ばね本体２１１の上面から上方に張り出して位置している比較例２の板ばね装置２００、と比べて、板ばね本体１１が、嵌合孔１３の中心軸Ｏ回りに回転しながら、上方に向けて撓み変形したときに、板ばね本体１１のうち、車軸Ｗを支持している長手方向の中央部領域が、車両進行方向に変位するのを抑制することができる。 Since the fitting hole 13 is located below the longitudinal end of the leaf spring body 11, the fitting hole 113 is located at the outer longitudinal edge of the leaf spring body 111 as shown in FIG. The leaf spring device 100 of Comparative Example 1 is positioned so as to extend in the longitudinal direction from 11a, and the fitting hole 213 as shown in FIG. Compared to the leaf spring device 200 of Comparative Example 2, when the leaf spring body 11 bends upward while rotating around the central axis O of the fitting hole 13, the part of the leaf spring body 11 , it is possible to suppress displacement of the longitudinal central region supporting the axle W in the vehicle traveling direction.

すなわち、図２～図５に示されるように、本実施形態の板ばね装置１、比較例１の板ばね装置１００、および比較例２の板ばね装置２００それぞれの側面図において、長手方向の中央部領域が同じ位置に位置している板ばね本体１１、１１１、２１１が、同じ形状で同じ位置に位置するまで、嵌合孔１３、１１３、２１３の中心軸Ｏ回りに回転しながら、上方に向けて撓み変形したときに、板ばね本体２１１、１１１、１１の長手方向の中央部領域（車軸Ｗの中心）における長手方向の移動量Ｄ２、Ｄ１、Ｄが、比較例２、比較例１および本実施形態の順に小さくなっている。 That is, as shown in Figs. 2 to 5, in the side views of the leaf spring device 1 of this embodiment, the leaf spring device 100 of Comparative Example 1, and the leaf spring device 200 of Comparative Example 2, when the leaf spring bodies 11, 111, and 211, whose longitudinal central regions are located at the same position, are flexed and deformed upward while rotating around the central axis O of the fitting holes 13, 113, and 213 until they are located at the same position with the same shape, the longitudinal movement amounts D2, D1, and D of the longitudinal central regions (center of the axle W) of the leaf spring bodies 211, 111, and 11 become smaller in the order of Comparative Example 2, Comparative Example 1, and this embodiment.

以上より、本実施形態による板ばね装置１によれば、板ばね本体１１が上方に撓み変形する際に、車軸Ｗが車両進行方向に変位するのを抑制することが可能になり、操縦安定性を向上させること等ができる。 As described above, according to the leaf spring device 1 according to the present embodiment, when the leaf spring main body 11 bends and deforms upward, it is possible to suppress displacement of the axle W in the vehicle traveling direction, thereby improving steering stability. It is possible to improve the

嵌合孔１３が、板ばね本体１１の下面から下方に向けて突出した突出部１４に形成されているので、板ばね本体１１が、嵌合孔１３の中心軸Ｏ回りに回転しながら、上方に向けて撓み変形したときに、板ばね本体１１の長手方向の中央部領域が、車両進行方向に変位するのを確実に抑制することができる。 Since the fitting hole 13 is formed in a protruding portion 14 that projects downward from the lower surface of the leaf spring body 11, the leaf spring body 11 rotates around the central axis O of the fitting hole 13 while rotating upward. When the plate spring main body 11 is bent and deformed toward , it is possible to reliably suppress the displacement of the central region in the longitudinal direction of the leaf spring main body 11 in the vehicle traveling direction.

嵌合孔１３の中心軸Ｏを通り、かつ板ばね本体１１の板厚方向に延びる直線Ｘが、板ばね本体１１と交差しているので、板ばね本体１１の長手方向の中央部と、嵌合孔１３の中心軸Ｏと、の長手方向の距離が抑えられ、板ばね本体１１が、嵌合孔１３の中心軸Ｏ回りに回転しながら、上方に向けて撓み変形したときに、板ばね本体１１の長手方向の中央部領域が、車両進行方向に変位するのを確実に小さく抑えることができる。 Since the straight line X passing through the central axis O of the fitting hole 13 and extending in the thickness direction of the leaf spring body 11 intersects with the leaf spring body 11, the longitudinal center portion of the leaf spring body 11 and the fitting The distance in the longitudinal direction from the center axis O of the fitting hole 13 is suppressed, and when the leaf spring main body 11 bends upward while rotating around the center axis O of the fitting hole 13, the leaf spring Displacement of the central region in the longitudinal direction of the main body 11 in the vehicle traveling direction can be reliably suppressed.

なお、本発明の技術的範囲は前記実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。 Note that the technical scope of the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention.

例えば、板ばね本体１１として、複数の板体が上下方向に積層された構成等を採用してもよい。
板ばね本体１１に空車荷重が加えられた状態で、板ばね本体１１が上方に向けて撓むのであれば、板ばね本体１１の上面における長手方向の中央部領域が車軸Ｗを支持してもよい。 For example, the leaf spring body 11 may have a structure in which a plurality of plates are stacked vertically.
If the leaf spring body 11 bends upward when an empty vehicle load is applied to the leaf spring body 11, even if the central region in the longitudinal direction on the upper surface of the leaf spring body 11 supports the axle W. good.

その他、本発明の趣旨を逸脱しない範囲で、前記実施形態における構成要素を周知の構成要素に置き換えることは適宜可能であり、また、前記した実施形態、および変形例を適宜組み合わせてもよい。 In addition, without departing from the spirit of the present invention, the components in the embodiments described above may be replaced with known components as appropriate, and the embodiments and modifications described above may be combined as appropriate.

１ 板ばね装置
１１ 板ばね本体
１１ａ 外端縁
１２ 目玉部
１３ 嵌合孔
１４ 突出部
Ｂ１ 車体
Ｂ２ 支持軸
ｈ 板厚
Ｌ 全長
Ｏ 中心軸
Ｗ 車軸
Ｘ 直線
Ｙ 撓み量
δ 最大撓み量 1 Leaf spring device 11 Leaf spring body 11a Outer edge 12 Eye part 13 Fitting hole 14 Projection part B1 Vehicle body B2 Support shaft h Plate thickness L Overall length O Central axis W Axle X Straight line Y Deflection amount δ Maximum deflection amount

Claims (4)

繊維強化樹脂製の板ばね本体と、
前記板ばね本体の長手方向の両端部に１つずつ設けられた２つの目玉部と、を備え、
前記目玉部に、前記板ばね本体の板幅方向に貫き、車体に取付けられた支持軸が嵌合される嵌合孔が形成され、
前記板ばね本体における長手方向の中央部領域が車軸を支持し、かつ前記嵌合孔に前記支持軸が嵌合されて、前記板ばね本体に空車荷重が加えられた状態で、前記板ばね本体の上方に向けた最大撓み量をδ、前記板ばね本体の全長をＬ、前記板ばね本体の板厚をｈとしたときに、ｈ×δ／Ｌ２が、０．０００５以上０．００１５以下となる、板ばね装置。 A leaf spring body made of fiber reinforced resin,
two eyeball portions provided one each at both ends in the longitudinal direction of the leaf spring body;
A fitting hole is formed in the eyelet portion, passing through the plate spring body in the plate width direction, and into which a support shaft attached to the vehicle body is fitted;
The central region in the longitudinal direction of the leaf spring body supports an axle, and the support shaft is fitted into the fitting hole, and the leaf spring body is in a state where an empty vehicle load is applied to the leaf spring body. When the maximum amount of upward deflection is δ, the total length of the leaf spring body is L, and the plate thickness of the leaf spring body is h, h×δ/L 2 is 0.0005 or more and 0.0015 or less. A leaf spring device. 前記嵌合孔は、前記板ばね本体の長手方向の端部の下方に位置している、請求項１に記載の板ばね装置。 The leaf spring device according to claim 1, wherein the fitting hole is located below a longitudinal end of the leaf spring body. 前記目玉部は、前記板ばね本体の下面から下方に向けて突出した突出部を備え、
前記突出部に前記嵌合孔が形成されている、請求項２に記載の板ばね装置。 The eyeball portion includes a protrusion that protrudes downward from the lower surface of the leaf spring main body,
The leaf spring device according to claim 2, wherein the fitting hole is formed in the protrusion. 前記嵌合孔の中心軸を通り、かつ前記板ばね本体の上下面に直交する板厚方向に延びる直線は、前記板ばね本体と交差している、請求項２または３に記載の板ばね装置。 The leaf spring device according to claim 2 or 3, wherein a straight line passing through the central axis of the fitting hole and extending in the plate thickness direction orthogonal to the upper and lower surfaces of the leaf spring body intersects the leaf spring body. .
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Publication number Priority date Publication date Assignee Title
JP2009541103A (en) 2006-06-16 2009-11-26 ラッシーニ，エス．エイ．デ シー．ヴイ． Two-leaf suspension for vehicle drive

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009541103A (en) 2006-06-16 2009-11-26 ラッシーニ，エス．エイ．デ シー．ヴイ． Two-leaf suspension for vehicle drive

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