JP7137382B2 - Shock absorber support system and suspension system - Google Patents

Shock absorber support system and suspension system Download PDF

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JP7137382B2
JP7137382B2 JP2018132182A JP2018132182A JP7137382B2 JP 7137382 B2 JP7137382 B2 JP 7137382B2 JP 2018132182 A JP2018132182 A JP 2018132182A JP 2018132182 A JP2018132182 A JP 2018132182A JP 7137382 B2 JP7137382 B2 JP 7137382B2
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press
steering shaft
diameter portion
diameter
shock absorber
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JP2020006907A (en
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公昭 牧野
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KYB Motorcycle Suspension Co Ltd
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KYB Motorcycle Suspension Co Ltd
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Priority to JP2018132182A priority Critical patent/JP7137382B2/en
Priority to PCT/JP2019/024651 priority patent/WO2020012915A1/en
Priority to DE112019003548.7T priority patent/DE112019003548T5/en
Priority to TW108123532A priority patent/TWI813717B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K21/00—Steering devices
    • B62K21/18—Connections between forks and handlebars or handlebar stems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K21/00—Steering devices
    • B62K21/04—Fork crowns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K25/00—Axle suspensions
    • B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
    • B62K25/06—Axle suspensions for mounting axles resiliently on cycle frame or fork with telescopic fork, e.g. including auxiliary rocking arms
    • B62K25/08—Axle suspensions for mounting axles resiliently on cycle frame or fork with telescopic fork, e.g. including auxiliary rocking arms for front wheel
    • 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
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/54—Arrangements for attachment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2226/00—Manufacturing; Treatments
    • F16F2226/04—Assembly or fixing methods; methods to form or fashion parts
    • F16F2226/045—Press-fitting
    • 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
    • F16F2230/36—Holes, slots or the like

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
  • Vehicle Body Suspensions (AREA)
  • Steering Controls (AREA)

Description

本発明は、緩衝器支持装置、及び緩衝器支持装置を備えた懸架装置の改良に関する。 The present invention relates to a shock absorber support device and an improvement of a suspension system equipped with a shock absorber support device.

従来、鞍乗型車両における前輪用の懸架装置は、前輪を支持する緩衝器と、緩衝器を支える緩衝器支持装置とを備え、この緩衝器支持装置が緩衝器に連結されるブラケットと、このブラケットに固定されるステアリングシャフトとを有している。そして、ハンドルを回転操作すると、懸架装置全体がステアリングシャフトを中心に回転して前輪の向きを変えるようになっている。 Conventionally, a suspension system for a front wheel in a straddle-type vehicle includes a shock absorber that supports the front wheel, a shock absorber support device that supports the shock absorber, a bracket that connects the shock absorber support device to the shock absorber, and a bracket that connects the shock absorber support device to the shock absorber. and a steering shaft fixed to the bracket. When the steering wheel is rotated, the entire suspension rotates around the steering shaft to change the direction of the front wheels.

また、緩衝器支持装置の中には、ブラケットに挿通孔を形成し、その挿通孔にステアリングシャフトを圧入して固定するものがある。このような場合、ステアリングシャフトとブラケットとの圧入箇所は、一カ所のみとなっている（例えば、特許文献１）。 Further, among shock absorber support devices, there is a bracket in which an insertion hole is formed and a steering shaft is press-fitted into the insertion hole for fixing. In such a case, there is only one place where the steering shaft and the bracket are press-fitted (for example, Patent Document 1).

特開平９－３０９４８０号公報、段落００３０、図６JP-A-9-309480, paragraph 0030, FIG.

ここで、車種によっては強度確保等の観点から、ブラケットの厚みを増してステアリングシャフトとブラケットの嵌合長を長く、ステアリングシャフトを太くしたい場合がある。このような場合において、従来のようにステアリングシャフトとブラケットとの圧入箇所が一カ所であると、圧入箇所の軸方向長さがそのまま嵌合長となるので、圧入箇所の周方向長さと軸方向長さがともに長くなる。 Here, depending on the type of vehicle, it may be desirable to increase the thickness of the bracket in order to increase the fitting length between the steering shaft and the bracket, and to increase the thickness of the steering shaft from the viewpoint of ensuring strength. In such a case, if the steering shaft and the bracket are press-fitted in one place as in the conventional art, the axial length of the press-fitted place becomes the fitting length. Both lengths increase.

すると、ステアリングシャフトの圧入荷重（ステアリングシャフトを挿通孔に圧入するのに要する荷重）が非常に大きくなってしまう。そして、ステアリングシャフトの圧入荷重が大きくなり過ぎると、これまでの圧入設備では対応できずに大型の圧入設備の導入が必要となってしまう。 Then, the press-fitting load of the steering shaft (the load required to press-fit the steering shaft into the insertion hole) becomes very large. If the press-fitting load of the steering shaft becomes too large, it will be necessary to introduce large-scale press-fitting equipment because the conventional press-fitting equipment cannot cope with this.

そのための対策としては、ステアリングシャフトとブラケットの圧入箇所の締め代（圧入代）を小さくする方法がある。しかし、車両走行時におけるステアリングシャフトの抜け荷重（ステアリングシャフトを挿通孔から引き抜くのに要する荷重）を確保するため、締め代を小さくするには限界があり、締め代の調整では圧入荷重を十分に低減できないことがある。 As a countermeasure for this, there is a method of reducing the tightening allowance (press-fit allowance) at the press-fit portion of the steering shaft and bracket. However, there is a limit to reducing the interference in order to secure the pull-out load of the steering shaft (the load required to pull the steering shaft out of the insertion hole) when the vehicle is running. may not be reduced.

そこで、本発明は、締め代を確保しつつステアリングシャフトの圧入荷重を十分に低減できる緩衝器支持装置及び懸架装置の提供を目的とする。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a shock absorber support device and a suspension device that can sufficiently reduce the press-fit load of a steering shaft while ensuring interference.

上記課題を解決する本発明の緩衝器支持装置は、ステアリングシャフトと、このステアリングシャフトが圧入される挿通孔が形成されるとともに緩衝器に連結されるブラケットとを備えている。そして、ステアリングシャフトとブラケットとの圧入箇所が軸方向に複数設けられており、挿通孔は、第一、第二の小孔部と、第一、第二の小孔部の間に設けられて径が前記第一、第二の小孔部の径よりも大きい大孔部とを有し、ステアリングシャフトが第一、第二の小孔部に圧入されている。 A shock absorber support device of the present invention for solving the above problem comprises a steering shaft and a bracket having an insertion hole into which the steering shaft is press-fitted and connected to the shock absorber. A plurality of press-fitting portions for the steering shaft and the bracket are provided in the axial direction, and the insertion holes are provided between the first and second small holes and between the first and second small holes. and a large hole portion having a diameter larger than that of the first and second small hole portions, and the steering shaft is press-fitted into the first and second small hole portions .

上記構成によれば、ステアリングシャフトとブラケットの圧入箇所が軸方向に複数あって圧入箇所の間に非圧入箇所ができるので、ステアリングシャフトとブラケットの嵌合長が長くなったとしても、非圧入箇所ができる分、圧入箇所全体の軸方向長さが短くなる。このため、締め代を確保しつつステアリングシャフトの圧入荷重を十分に低減できる。 According to the above configuration, since there are a plurality of press-fitted portions of the steering shaft and the bracket in the axial direction and there are non-press-fitted portions between the press-fitted portions, even if the fitting length between the steering shaft and the bracket is increased, the non-press-fitted portions are not press-fitted. As a result, the axial length of the entire press-fitting portion is shortened. Therefore, the press-fitting load of the steering shaft can be sufficiently reduced while securing the interference.

また、本発明の緩衝支持装置によれば、ステアリングシャフトとブラケットの圧入箇所を軸方向に複数設けるための構成を容易に実現できるとともに、圧入箇所の増減を容易にできる。 Further, according to the shock absorbing support device of the present invention, it is possible to easily realize a configuration for providing a plurality of press-fitting portions of the steering shaft and the bracket in the axial direction, and to easily increase or decrease the number of press-fitting portions.

さらに、上記課題を解決する他の発明の緩衝器支持装置は、ステアリングシャフトと、このステアリングシャフトが圧入される挿通孔が形成されるとともに緩衝器に連結されるブラケットとを備えている。そして、ステアリングシャフトとブラケットとの圧入箇所が軸方向に複数設けられており、ステアリングシャフトが大径部と、外径が大径部の外径よりも小さい中径部とを有するとともに、挿通孔が大孔部と、径が大孔部の径よりも小さい小孔部とを有し、大径部が大孔部に圧入されるとともに、中径部が小孔部に圧入されている。上記構成によれば、ステアリングシャフトとブラケットの圧入箇所が軸方向に複数あって圧入箇所の間に非圧入箇所ができるので、ステアリングシャフトとブラケットの嵌合長が長くなったとしても、非圧入箇所ができる分、圧入箇所全体の軸方向長さが短くなる。このため、締め代を確保しつつステアリングシャフトの圧入荷重を十分に低減できる。さらに、当該構成によれば、中径部が大孔部内を容易に通過できるので、圧入ストロークを短くできるとともに圧入時間を短縮できる。 Further, a shock absorber support device of another invention for solving the above-mentioned problems includes a steering shaft and a bracket having an insertion hole into which the steering shaft is press-fitted and connected to the shock absorber. A plurality of press-fitting portions of the steering shaft and the bracket are provided in the axial direction. has a large hole portion and a small hole portion whose diameter is smaller than that of the large hole portion, and the large diameter portion is press-fitted into the large hole portion and the medium-diameter portion is press-fitted into the small hole portion. According to the above configuration, since there are a plurality of press-fitted portions of the steering shaft and the bracket in the axial direction and there are non-press-fitted portions between the press-fitted portions, even if the fitting length between the steering shaft and the bracket is increased, the non-press-fitted portions are not press-fitted. As a result, the axial length of the entire press-fitting portion is shortened. Therefore, the press-fitting load of the steering shaft can be sufficiently reduced while securing the interference. Furthermore, according to this configuration, the medium-diameter portion can easily pass through the large hole, so that the press-fitting stroke can be shortened and the press-fitting time can be shortened.

また、上記他の発明の緩衝器支持装置では、ステアリングシャフトが大径部と中径部との間に設けられて外径が大径部及び中径部の外径よりも小さい小径部を有しているとよい。当該構成によれば、小径部が圧入工程の何れの段階でも圧入されないので、小径部については加工精度を落とせる。このため、ステアリングシャフトの加工を容易にできる。 Further, in the shock absorber support device of the other invention , the steering shaft has a small diameter portion provided between the large diameter portion and the medium diameter portion and having an outer diameter smaller than that of the large diameter portion and the medium diameter portion. I hope you are. According to this configuration, the small-diameter portion is not press-fitted at any stage of the press-fitting process, so the machining accuracy of the small-diameter portion can be reduced. Therefore, it is possible to easily process the steering shaft.

また、上記他の発明の緩衝器支持装置では、ステアリングシャフトが小径部と大径部との間又は大径部と中径部の間に設けられて外径が小径部又は中径部の外径よりも大きく大径部の外径よりも小さいガイド部を有していると、中径部に遅れて大径部が圧入される場合であっても、中径部の圧入開始時にガイド部が大孔部内に挿入されるようにしておけば、ステアリングシャフトが挿通孔に対して傾くのを防止できる。 Further, in the shock absorber support device of the other invention , the steering shaft is provided between the small diameter portion and the large diameter portion or between the large diameter portion and the medium diameter portion and has an outer diameter outside the small diameter portion or the medium diameter portion . If the guide portion is larger than the diameter and smaller than the outer diameter of the large-diameter portion, even if the large-diameter portion is press-fitted after the medium-diameter portion is press-fitted, the guide portion will not move when the medium-diameter portion starts to be press-fitted. is inserted into the large hole, the steering shaft can be prevented from tilting with respect to the insertion hole.

また、上記緩衝器支持装置では、ブラケットの線膨張係数がステアリングシャフトの線膨張係数よりも大きいとよい。当該構成によれば、締め代の調整によりステアリングシャフトの圧入荷重を低減するのが非常に困難になるため、本発明に係る緩衝器支持装置のように圧入箇所を軸方向に複数設けてステアリングシャフトの圧入荷重を低減するのが特に有効である。 Further, in the damper support device, the linear expansion coefficient of the bracket is preferably larger than the linear expansion coefficient of the steering shaft. With this configuration, it is very difficult to reduce the press-fit load of the steering shaft by adjusting the interference. It is particularly effective to reduce the press-fit load of

また、懸架装置が車両の車車輪を支持する緩衝器と、上記緩衝器支持装置とを備え、緩衝器を緩衝器支持装置で支持しているとよい。当該構成においても、ステアリングシャフトとブラケットの圧入箇所が軸方向に複数あって圧入箇所の間に非圧入箇所ができるので、ステアリングシャフトとブラケットの嵌合長が長くなったとしても、非圧入箇所ができる分、圧入箇所全体の軸方向長さが短くなる。 Further, the suspension system may include a shock absorber for supporting the wheels of the vehicle and the shock absorber support device, and the shock absorber may be supported by the shock absorber support device. Also in this configuration, there are a plurality of press-fitted portions between the steering shaft and the bracket in the axial direction, and there are non-press-fitted portions between the press-fitted portions. As much as possible, the axial length of the entire press-fitting portion is shortened.

本発明に係る緩衝器支持装置及び懸架装置によれば、締め代を確保しつつステアリングシャフトの圧入荷重を十分に低減できる。 According to the shock absorber support device and the suspension system according to the present invention, it is possible to sufficiently reduce the press-fit load of the steering shaft while ensuring the interference.

本発明の一実施の形態に係る緩衝器支持装置を備えた懸架装置の取付状態を簡略化して示した側面図である。1 is a side view showing a simplified mounting state of a suspension system having a shock absorber support device according to an embodiment of the present invention; FIG. 本発明の一実施の形態に係る緩衝器支持装置の一部を拡大して示した縦断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is the longitudinal cross-sectional view which expanded and showed a part of shock absorber support apparatus which concerns on one embodiment of this invention. 図２に示す緩衝器支持装置におけるステアリングシャフトの圧入開始時の状態を示した縦断面図である。FIG. 3 is a vertical cross-sectional view showing a state at the start of press-fitting of the steering shaft in the shock absorber support device shown in FIG. 2 ; 本発明の一実施の形態に係る緩衝器支持装置の第一の変形例を示し、当該変形例に係る緩衝器支持装置の一部を拡大して示した縦断面図である。It is the longitudinal cross-sectional view which showed the 1st modification of the shock absorber support apparatus which concerns on one embodiment of this invention, and expanded and showed a part of shock absorber support apparatus which concerns on the said modification. 本発明の一実施の形態に係る緩衝器支持装置の第二の変形例を示し、当該変形例に係る緩衝器支持装置の一部を拡大して示した縦断面図である。It is the longitudinal cross-sectional view which showed the 2nd modification of the shock absorber support apparatus which concerns on one embodiment of this invention, and expanded and showed a part of shock absorber support apparatus which concerns on the said modification.

以下に本発明の実施の形態の緩衝器支持装置について、図面を参照しながら説明する。いくつかの図面を通して付された同じ符号は、同じ部品（部分）か対応する部品（部分）を示す。 EMBODIMENT OF THE INVENTION Below, the shock absorber support apparatus of embodiment of this invention is demonstrated, referring drawings. The same reference numerals throughout the several drawings indicate the same or corresponding parts (portions).

図１に示すように、本発明の一実施の形態に係る緩衝器支持装置Ａは、鞍乗型車両における前輪Ｗ用の懸架装置Ｓに利用されており、その懸架装置Ｓはハンドル操作により回転して前輪Ｗの向きを変えるようになっている。以下の説明では、懸架装置Ｓが車両に取り付けられた状態での上下を、特別な説明がない限り、単に「上」「下」という。 As shown in FIG. 1, a shock absorber support device A according to one embodiment of the present invention is used in a suspension device S for a front wheel W of a straddle-type vehicle, and the suspension device S is rotated by operating a steering wheel. to change the direction of the front wheel W. In the following description, the top and bottom when the suspension system S is attached to the vehicle are simply referred to as "top" and "bottom" unless otherwise specified.

より具体的に、懸架装置Ｓは、鞍乗型車両の進行方向に並ぶ一対の緩衝器Ｄ，Ｄと、これら緩衝器Ｄ，Ｄの下端部を前輪Ｗの車軸に連結する車輪側のブラケットＢと、一対の緩衝器Ｄ，Ｄの上端部に連結される車体側のブラケット１と、このブラケット１から上方へ突出するステアリングシャフト２とを備える。 More specifically, the suspension system S includes a pair of shock absorbers D, D arranged in the traveling direction of the straddle-type vehicle, and a wheel-side bracket B that connects the lower ends of the shock absorbers D, D to the axle of the front wheel W. , a vehicle body-side bracket 1 connected to the upper ends of a pair of shock absorbers D, D, and a steering shaft 2 projecting upward from the bracket 1 .

このような懸架装置Ｓにおいて、車体側のブラケット１とステアリングシャフト２とを含む部分が緩衝器支持装置Ａである。そして、この緩衝器支持装置Ａによって緩衝器Ｄ，Ｄの上端部が支えられ、その緩衝器Ｄ，Ｄが車輪側のブラケットＢを介して前輪Ｗを支えるようになっている。 In such a suspension system S, a shock absorber support system A is a part including the bracket 1 and the steering shaft 2 on the vehicle body side. Upper ends of the shock absorbers D, D are supported by the shock absorber support device A, and the shock absorbers D, D support the front wheel W via the wheel-side bracket B. As shown in FIG.

また、ステアリングシャフト２は車体に回転自在に支持されている。そして、ハンドルを回転操作すると懸架装置Ｓ全体がステアリングシャフト２を中心に回転する。このとき、懸架装置Ｓとともに前輪Ｗが回転し、前輪Ｗの向きが変わるようになっている。また、鞍乗型車両が凹凸のある路面を走行する等して前輪Ｗが上下に振動すると緩衝器Ｄ，Ｄが伸縮し、路面凹凸による衝撃がそのまま車体に伝わるのを防ぐ。 Also, the steering shaft 2 is rotatably supported by the vehicle body. When the steering wheel is rotated, the suspension system S as a whole rotates around the steering shaft 2 . At this time, the front wheel W rotates together with the suspension system S, and the direction of the front wheel W changes. Further, when the front wheel W vibrates vertically when the saddle type vehicle runs on an uneven road surface, the shock absorbers D, D are expanded and contracted to prevent the impact due to the uneven road surface from being transmitted to the vehicle body as it is.

各緩衝器Ｄは、如何なる構成であってもよい。例えば、図１に示す緩衝器Ｄ，Ｄは、アウターチューブＯＴと、このアウターチューブＯＴ内に摺動自在に挿入されるインナーチューブＩＴとを備え、アウターチューブＯＴが車体に、インナーチューブＩＴが車軸に連結されている。しかし、インナーチューブＩＴが車体に、アウターチューブＯＴが車軸に連結されていてもよい。 Each buffer D may be of any configuration. For example, the shock absorbers D, D shown in FIG. 1 include an outer tube OT and an inner tube IT slidably inserted into the outer tube OT. connected to However, the inner tube IT may be connected to the vehicle body, and the outer tube OT may be connected to the axle.

さらに、各緩衝器Ｄ，Ｄは、コイルばね又はエアばね等のばねのみを用いる緩衝器であっても、作動油等の流体の抵抗を利用する液圧緩衝器であっても、ばね類と流体の抵抗を併用する緩衝器であってもよい。さらには、一対の緩衝器Ｄ，Ｄのうちの一方を、緩衝作用を持たないガイド等に替えてもよい。 Further, each of the shock absorbers D, D may be a shock absorber using only a spring such as a coil spring or an air spring, or a hydraulic shock absorber utilizing the resistance of a fluid such as hydraulic oil. A shock absorber that also uses fluid resistance may be used. Furthermore, one of the pair of dampers D, D may be replaced with a guide or the like having no damping action.

また、緩衝器Ｄの配置も適宜変更できる。例えば、図１に示す懸架装置Ｓは、片持ち型であり、一対の緩衝器Ｄ，Ｄを前輪Ｗの回転軸方向の片側に配置しているが、一対の緩衝器Ｄ，Ｄを前輪Ｗの回転軸方向の両側に配置してもよい。さらに、一対の緩衝器Ｄ，Ｄの上端をブラケット１から上方へ突出させて、そのブラケット１の上側に緩衝器Ｄ，Ｄの上端を連結するアッパーブラケットを設けてもよい。 Also, the arrangement of the shock absorber D can be changed as appropriate. For example, the suspension system S shown in FIG. may be arranged on both sides in the direction of the rotation axis. Furthermore, an upper bracket may be provided that projects the upper ends of the pair of shock absorbers D, D upward from the bracket 1 and connects the upper ends of the shock absorbers D, D to the upper side of the bracket 1 .

また、図１に示すような片持ち型の懸架装置Ｓは、例えば、前輪二輪、後輪一輪の三輪オートバイ（逆トライク）に利用されているが、懸架装置Ｓを搭載する鞍乗型車両はこの限りではない。具体的に、鞍乗型車両とは、鞍に跨るような姿勢で乗車するタイプの車両全般のことであり、二輪のオートバイ、前輪一輪、後輪二輪の三輪オートバイ（トライク）、スクータ、バギー等が含まれる。本発明に係る緩衝器支持装置、及びこれを含む懸架装置は、如何なる鞍乗型車両に搭載されていてもよい。 A cantilevered suspension system S as shown in FIG. 1 is used, for example, in a three-wheeled motorcycle (reverse trike) having two front wheels and one rear wheel. This is not the case. Specifically, a straddle-type vehicle is a general type of vehicle that is ridden in a posture astride a saddle, such as a two-wheeled motorcycle, a three-wheeled motorcycle (trike) with one front wheel and two rear wheels, a scooter, and a buggy. is included. The shock absorber support device according to the present invention and the suspension system including the same may be mounted on any straddle-type vehicle.

つづいて、本実施の形態において、車体側のブラケット１は一対の環状の把持部１０，１０を含む。各把持部１０には、切割（図示せず）が形成されており、この切割を広げると把持部１０が拡径し、逆に切割を狭めると把持部１０が縮径する。その切割の間隔は、ボルト１１で調節できるようになっており、把持部１０に緩衝器Ｄの上端部を挿通してからボルト１１で切割を狭めると、緩衝器Ｄの上端部が把持部１０で締め付けられる。 Next, in the present embodiment, the bracket 1 on the vehicle body side includes a pair of annular gripping portions 10,10. A notch (not shown) is formed in each of the gripping portions 10. When the slit is widened, the diameter of the gripping portion 10 is increased, and when the slit is narrowed, the diameter of the gripping portion 10 is reduced. The interval between the cuts can be adjusted with bolts 11. When the upper end of the shock absorber D is inserted into the gripping portion 10 and the cut is narrowed with the bolts 11, the upper end of the shock absorber D is adjusted to the gripping portion 10. be tightened with

このように、本実施の形態では、緩衝器Ｄの上端部を把持部１０で締め付けて、緩衝器Ｄをブラケット１に連結している。つまり、本実施の形態のブラケット１では、把持部１０が緩衝器Ｄを連結するための連結部として機能する。しかし、連結部の構成は把持部１０に限られず、ブラケット１に連結される緩衝器Ｄ等に合せて自由に変更できる。 Thus, in this embodiment, the upper end of the shock absorber D is clamped by the grip portion 10 to connect the shock absorber D to the bracket 1 . That is, in the bracket 1 of the present embodiment, the grip portion 10 functions as a connecting portion for connecting the shock absorber D. As shown in FIG. However, the configuration of the connecting portion is not limited to the grip portion 10, and can be freely changed according to the shock absorber D or the like connected to the bracket 1. FIG.

また、図２に示すように、車体側のブラケット１における把持部（連結部）１０以外の部分には、そのブラケット１の肉厚を貫通する挿通孔３が形成されている。本実施の形態では、ブラケット１がアルミ製、ステアリングシャフト２が鉄製であり、ブラケット１の挿通孔３にステアリングシャフト２が圧入されて固定される。 Further, as shown in FIG. 2, an insertion hole 3 is formed through the thickness of the bracket 1 at a portion other than the gripping portion (connecting portion) 10 of the bracket 1 on the vehicle body side. In this embodiment, the bracket 1 is made of aluminum and the steering shaft 2 is made of iron.

より具体的に、ブラケット１の挿通孔３は、軸方向に連なる径違いの小孔部３ａと大孔部３ｂとを含み、大孔部３ｂの径が小孔部３ａの径よりも大きい。また、本実施の形態では、挿通孔３の下端がステアリングシャフト２圧入時の入口（以下、単に「入口」という）となっており、大孔部３ｂは小孔部３ａの入口側にある。 More specifically, the insertion hole 3 of the bracket 1 includes a small hole portion 3a and a large hole portion 3b that are axially connected to each other and have different diameters, and the diameter of the large hole portion 3b is larger than the diameter of the small hole portion 3a. Further, in the present embodiment, the lower end of the insertion hole 3 serves as an entrance (hereinafter simply referred to as "inlet") when the steering shaft 2 is press-fitted, and the large hole portion 3b is located on the entrance side of the small hole portion 3a.

さらに、挿通孔３における大孔部３ｂより入口側は導入部３ｃとなっており、この導入部３ｃの径は大孔部３ｂの径よりもさらに大きい。そして、挿通孔３の周壁における導入部３ｃと大孔部３ｂの境界部分は、後述のストップリング９が突き当たる衝合部３ｄとなっている。 Further, the inlet side of the insertion hole 3 from the large hole portion 3b is an introduction portion 3c, and the diameter of the introduction portion 3c is larger than the diameter of the large hole portion 3b. A boundary portion between the introduction portion 3c and the large hole portion 3b on the peripheral wall of the insertion hole 3 forms a contact portion 3d against which a stop ring 9, which will be described later, abuts.

その一方、ステアリングシャフト２は、緩衝器支持装置Ａが完成した状態（組立後）で、挿通孔３の上端から上方へ突出する本体部２ａと、この本体部２ａの下端に連なり挿通孔３に挿入される挿入部２ｂとを含む。この挿入部２ｂは、軸方向に連なる外径違いの小径部４、中径部５、及び大径部６を含み、中径部５の外径は小径部４の外径よりも大きく、大径部６の外径は中径部５の外径よりもさらに大きい。 On the other hand, the steering shaft 2 has a main body portion 2a that protrudes upward from the upper end of the insertion hole 3 and a main body portion 2a that extends from the lower end of the main body portion 2a to the insertion hole 3 when the shock absorber support device A is completed (after assembly). and an insertion portion 2b to be inserted. The insertion portion 2b includes a small-diameter portion 4, a medium-diameter portion 5, and a large-diameter portion 6, which are connected in the axial direction and have different outer diameters. The outer diameter of diameter portion 6 is larger than the outer diameter of medium diameter portion 5 .

また、ステアリングシャフト２を挿通孔３へ挿し込む際に挿入開始側となる方の端を挿入先端、その反対側の端を挿入末端とする。すると、本実施の形態では、ステアリングシャフト２が本体部２ａ側から挿通孔３へ挿入されるようになっており、ステアリングシャフト２の上端が挿入先端、ステアリングシャフト２の下端が挿入末端となっている。 Also, when the steering shaft 2 is inserted into the insertion hole 3, the end on the insertion start side is defined as the insertion tip, and the opposite end is defined as the insertion end. Then, in the present embodiment, the steering shaft 2 is inserted into the insertion hole 3 from the side of the body portion 2a, the upper end of the steering shaft 2 is the insertion tip, and the lower end of the steering shaft 2 is the insertion end. there is

このようなステアリングシャフト２において、中径部５は小径部４の挿入先端側にあり、小径部４と本体部２ａとの間に位置する。そして、本体部２ａ及び小径部４の外径は、挿通孔３において径の最も小さい部分となる小孔部３ａの径よりも小さい。その一方、中径部５の外径は、大孔部３ｂの径より小さいが小孔部３ａの径よりは若干大きく、小孔部３ａが中径部５に対して所定の締め代をもつ。 In such a steering shaft 2, the medium-diameter portion 5 is located on the insertion distal end side of the small-diameter portion 4 and positioned between the small-diameter portion 4 and the main body portion 2a. The outer diameters of the main body portion 2a and the small diameter portion 4 are smaller than the diameter of the small hole portion 3a, which is the portion having the smallest diameter in the insertion hole 3. As shown in FIG. On the other hand, the outer diameter of the medium diameter portion 5 is smaller than the diameter of the large hole portion 3b but slightly larger than the diameter of the small hole portion 3a, and the small hole portion 3a has a predetermined interference with respect to the medium diameter portion 5. .

また、大径部６は、小径部４の挿入末端側にあり、小径部４と大径部６との間には、外径が小径部４の外径よりも大きく、大径部６の外径よりも小さいガイド部７が設けられている。このガイド部７は、大孔部３ｂに符号する外径を有する。その一方、大径部６の外径は、大孔部３ｂの径よりも若干大きく、大孔部３ｂが大径部６に対して所定の締め代をもつ。 The large-diameter portion 6 is located on the insertion end side of the small-diameter portion 4 . A guide portion 7 smaller than the outer diameter is provided. This guide portion 7 has an outer diameter corresponding to that of the large hole portion 3b. On the other hand, the outer diameter of the large-diameter portion 6 is slightly larger than the diameter of the large-diameter portion 3b, and the large-diameter portion 3b has a predetermined interference with respect to the large-diameter portion 6. As shown in FIG.

本実施の形態において締め代とは、軸を穴（孔）に圧入する場合に、その圧入前の軸の外周の直径（以下、単に「軸の直径」という）が圧入前の穴の直径より大きく、圧入前の軸の直径から圧入前の穴の直径を差し引いた値のことである。そして、小孔部３ａの中径部５に対する締め代と、大孔部３ｂの大径部６に対する締め代は、それぞれ任意に設定できるが、本実施の形態では等しくなるように設定されている。この締め代が等しいとは、完全同一のみに限られず、製造上の誤差を許容する概念である。 In this embodiment, the interference means that when the shaft is press-fitted into a hole (hole), the diameter of the outer circumference of the shaft before press-fitting (hereinafter simply referred to as the "diameter of the shaft") is larger than the diameter of the hole before press-fitting. Largely, it is the value obtained by subtracting the diameter of the hole before press-fitting from the diameter of the shaft before press-fitting. The tightening margin for the medium diameter portion 5 of the small hole portion 3a and the tightening margin for the large diameter portion 6 of the large hole portion 3b can be arbitrarily set, but are set to be equal in this embodiment. . The equal interference is not limited to being exactly the same, but is a concept that allows manufacturing errors.

上記構成によれば、中径部５と小孔部３ａの周壁との接触部、及び大径部６と大孔部３ｂの周壁との接触部の二カ所がステアリングシャフト２とブラケット１との圧入箇所となる。そして、これらの圧入箇所が上下（軸方向）に分離され、これらの間が非圧入箇所となっている。 According to the above configuration, the contact portion between the medium diameter portion 5 and the peripheral wall of the small hole portion 3a and the contact portion between the large diameter portion 6 and the peripheral wall of the large hole portion 3b are located between the steering shaft 2 and the bracket 1. It becomes a press-fitting point. These press-fitting portions are separated vertically (in the axial direction), and a non-press-fitting portion is formed between them.

また、本実施の形態では、ステアリングシャフト２の本体部２ａ側に位置する上側の圧入箇所（中径部５と小孔部３ａの周壁との接触部）の軸方向長さは、下側の圧入箇所（大径部６と大孔部３ｂの周壁との接触部）の軸方向長さよりも若干長い。このため、本体部２ａに横力が作用した場合に、その横力に対する強度確保の点で有利になる。しかし、各圧入箇所の軸方向長さは自由に設定できる。 Further, in the present embodiment, the axial length of the upper press-fit portion (the contact portion between the medium diameter portion 5 and the peripheral wall of the small hole portion 3a) located on the side of the main body portion 2a of the steering shaft 2 is the length of the lower portion. It is slightly longer than the axial length of the press-fit portion (the contact portion between the large diameter portion 6 and the peripheral wall of the large hole portion 3b). Therefore, when a lateral force acts on the main body portion 2a, it is advantageous in ensuring strength against the lateral force. However, the axial length of each press-fitting portion can be freely set.

さらに、大孔部３ｂの軸方向長さは、中径部５と小径部４とを合わせた軸方向長さよりも長く、中径部５、小径部４及びガイド部７を合せた軸方向長さよりも短い。このため、図３に示すように、中径部５の上端が小孔部３ａの下端に達した時点では、ガイド部７が大孔部３ｂに嵌合しているが、大径部６は大孔部３ｂ外にある。 Further, the axial length of the large hole portion 3b is longer than the combined axial length of the intermediate diameter portion 5 and the small diameter portion 4, and the combined axial length of the intermediate diameter portion 5, the small diameter portion 4 and the guide portion 7. shorter than Therefore, as shown in FIG. 3, when the upper end of the medium diameter portion 5 reaches the lower end of the small hole portion 3a, the guide portion 7 is fitted in the large hole portion 3b, but the large diameter portion 6 is It is outside the large hole portion 3b.

また、ステアリングシャフト２における大径部６の挿入末端側には、制限部８が設けられている。この制限部８の外周には周方向に沿う環状溝８ａ（図２）が形成されており、その環状溝８ａにストップリング９が嵌合される。このストップリング９がステアリングシャフト２に装着された状態では、ストップリング９の外径が大径部６の外径よりも大きくなる。 A restriction portion 8 is provided on the insertion end side of the large diameter portion 6 in the steering shaft 2 . An annular groove 8a (FIG. 2) is formed in the outer periphery of the restricting portion 8 along the circumferential direction, and a stop ring 9 is fitted into the annular groove 8a. When the stop ring 9 is attached to the steering shaft 2 , the outer diameter of the stop ring 9 is larger than the outer diameter of the large diameter portion 6 .

以下に、本実施の形態に係る緩衝器支持装置Ａにおけるブラケット１とステアリングシャフト２の組立工程について説明する。 The steps of assembling the bracket 1 and the steering shaft 2 in the shock absorber support device A according to this embodiment will be described below.

ステアリングシャフト２は、本体部２ａから挿通孔３内に挿入されて、この挿通孔３内を上向きに進む。このステアリングシャフト２において、挿通孔３に最初に挿入される本体部２ａは、挿通孔３内を比較的抵抗なく通過する。 The steering shaft 2 is inserted into the insertion hole 3 from the body portion 2a and advances upward through the insertion hole 3 . In this steering shaft 2, the body portion 2a that is first inserted into the insertion hole 3 passes through the insertion hole 3 relatively without resistance.

その一方、本体部２ａにつづいて挿通孔３に挿入される中径部５は、大孔部３ｂ内を比較的抵抗なく通過するが、小孔部３ａに達すると圧入抵抗を受けるようになる。また、大径部６は、中径部５の小孔部３ａへの接近に伴い大孔部３ｂに接近し、大孔部３ｂに達すると圧入抵抗を受けるようになる。 On the other hand, the medium-diameter portion 5, which is inserted into the insertion hole 3 following the body portion 2a, passes through the large hole portion 3b relatively without resistance, but when it reaches the small hole portion 3a, it receives press-fitting resistance. . As the medium diameter portion 5 approaches the small hole portion 3a, the large diameter portion 6 approaches the large hole portion 3b, and when it reaches the large hole portion 3b, it receives press-fitting resistance.

このようにステアリングシャフト２が圧入抵抗を受ける圧入工程では、高い荷重（圧入荷重）をかけつつステアリングシャフト２を挿通孔３内へ押し進めていく必要がある。そして、図３に示すように、中径部５が小孔部３ａに達した時点、即ち、ステアリングシャフト２の圧入開始時には、大径部６が大孔部３ｂの外にある。このため、圧入工程の初期では、中径部５のみが圧入され、圧入工程の途中から中径部５と大径部６の両方が圧入される。 In the press-fitting process in which the steering shaft 2 receives press-fitting resistance, it is necessary to push the steering shaft 2 into the insertion hole 3 while applying a high load (press-fitting load). As shown in FIG. 3, when the medium diameter portion 5 reaches the small hole portion 3a, that is, when the steering shaft 2 starts to be press-fitted, the large diameter portion 6 is outside the large hole portion 3b. Therefore, at the beginning of the press-fitting process, only the medium-diameter portion 5 is press-fitted, and from the middle of the press-fitting process, both the medium-diameter portion 5 and the large-diameter portion 6 are press-fitted.

さらに、図３に示すように、中径部５が小孔部３ａに達した時点では、ガイド部７が大孔部３ｂに嵌合している。このため、大径部６が中径部５に遅れて圧入される場合であっても、中径部５のみが圧入される工程で挿通孔３の軸に対してステアリングシャフト２の軸が傾くのをガイド部７で防いで、中径部５と小孔部３ａの周壁との間でカジリが生じるのを防ぐ。 Furthermore, as shown in FIG. 3, when the medium diameter portion 5 reaches the small hole portion 3a, the guide portion 7 is fitted into the large hole portion 3b. Therefore, even if the large-diameter portion 6 is press-fitted behind the medium-diameter portion 5, the axis of the steering shaft 2 is tilted with respect to the axis of the insertion hole 3 during the process in which only the medium-diameter portion 5 is press-fit. This is prevented by the guide portion 7 to prevent galling between the medium diameter portion 5 and the peripheral wall of the small hole portion 3a.

そして、さらにステアリングシャフト２を挿通孔３内へ圧入していくと、ストップリング９が衝合部３ｄに突き当たり、それ以上の挿通孔３内でのステアリングシャフト２の上方への移動が阻止される。これにより、圧入工程が終了するとともに、ステアリングシャフト２とブラケット１との組み立てが完了する。 When the steering shaft 2 is further press-fitted into the insertion hole 3, the stop ring 9 abuts against the abutting portion 3d, and further upward movement of the steering shaft 2 within the insertion hole 3 is prevented. . As a result, the press-fitting process is completed, and the assembly of the steering shaft 2 and the bracket 1 is completed.

以下に、本発明の一実施の形態に係る緩衝器支持装置Ａと、この緩衝器支持装置Ａを備えた懸架装置Ｓの作用効果について説明する。 Below, the effects of the shock absorber support device A according to the embodiment of the present invention and the suspension system S provided with this shock absorber support device A will be described.

本実施の形態に係る緩衝器支持装置Ａは、懸架装置Ｓに利用されており、この懸架装置Ｓは、鞍乗型車両（車両）の前輪（車輪）Ｗを支持する緩衝器Ｄを備え、この緩衝器Ｄを緩衝器支持装置Ａで支えるようになっている。 The shock absorber support device A according to the present embodiment is used in a suspension system S. The suspension system S includes shock absorbers D that support front wheels (wheels) W of a straddle-type vehicle (vehicle), The shock absorber D is supported by a shock absorber support device A.

さらに、上記緩衝器支持装置Ａは、ステアリングシャフト２と、このステアリングシャフト２が圧入される挿通孔３が形成されるとともに緩衝器Ｄに連結されるブラケット１とを備えている。そして、ステアリングシャフト２とブラケット１との圧入箇所が軸方向に二カ所設けられている。このように、本実施の形態ではステアリングシャフト２とブラケット１の圧入箇所が軸方向に二分されていて、これらの間に非圧入箇所ができる。 Further, the shock absorber support device A includes a steering shaft 2 and a bracket 1 connected to a shock absorber D and formed with an insertion hole 3 into which the steering shaft 2 is press-fitted. There are two press-fitting portions for the steering shaft 2 and the bracket 1 in the axial direction. As described above, in the present embodiment, the press-fitted portions of the steering shaft 2 and the bracket 1 are divided into two in the axial direction, and there is a non-press-fitted portion between them.

ここで、強度確保等を目的として、ブラケット１の厚みを増してステアリングシャフト２とブラケット１の嵌合長を長く、ステアリングシャフト２を太くした場合について考える。 Here, consider a case where the thickness of the bracket 1 is increased for the purpose of ensuring strength, etc., the fitting length between the steering shaft 2 and the bracket 1 is increased, and the steering shaft 2 is thickened.

従来のようにステアリングシャフトとブラケットとの圧入箇所が一カ所である場合、圧入箇所の軸方向長さがそのまま嵌合長となる。このため、嵌合長を長くすると圧入箇所の軸方向長さが長くなる。さらには、圧入箇所の周方向長さも長くなる。このように、圧入箇所の軸方向長さ、周方向長さがともに長くなると、圧入荷重が非常に大きくなってしまう。すると、圧入箇所の締め代の調整だけでは圧入荷重を十分に低減できず、これまでの設備ではステアリングシャフトとブラケットの組み立てができなくなることがある。 When the steering shaft and the bracket are press-fitted at one place as in the conventional art, the length in the axial direction of the press-fitting place becomes the fitting length as it is. Therefore, if the fitting length is lengthened, the axial length of the press-fitting portion is lengthened. Furthermore, the circumferential length of the press-fit portion is also increased. Thus, if both the axial length and the circumferential length of the press-fit portion are long, the press-fit load becomes very large. As a result, the press-fit load cannot be sufficiently reduced only by adjusting the interference at the press-fit location, and the steering shaft and bracket may not be assembled using conventional equipment.

これに対して、本実施の形態のように、ステアリングシャフト２とブラケット１の圧入箇所が軸方向に複数あって圧入箇所の間に非圧入箇所ができる場合には、嵌合長が長くなったとしても圧入箇所全体の軸方向長さを低減できる。具体的に、本実施の形態では、圧入箇所が上下に二カ所あり、中径部５と小孔部３ａの周壁との接触部が上側の圧入箇所、大径部６と大孔部３ｂの周壁との接触部が下側の圧入箇所となっている。 On the other hand, as in the present embodiment, when there are a plurality of press-fitted portions of the steering shaft 2 and the bracket 1 in the axial direction and non-press-fitted portions are formed between the press-fitted portions, the fitting length becomes longer. However, the axial length of the entire press-fit portion can be reduced. Specifically, in the present embodiment, there are two upper and lower press-fitting locations. The contact portion with the peripheral wall is the lower press-fit portion.

そして、本実施の形態におけるステアリングシャフト２とブラケット１の嵌合長は、上側の圧入箇所の上端から下側の圧入箇所の下端までの長さとなり、圧入箇所全体の軸方向長さは、上下の圧入箇所の軸方向長さの合計となる。つまり、本実施の形態では、上下の圧入箇所の間に非圧入箇所ができる分、嵌合長よりも圧入箇所全体の軸方向長さが短くなる。 In this embodiment, the fitting length between the steering shaft 2 and the bracket 1 is the length from the upper end of the upper press-fitting portion to the lower end of the lower press-fitting portion. is the sum of the axial lengths of the press-fit points. That is, in the present embodiment, the axial length of the entire press-fitting portion is shorter than the fitting length by the amount of the non-press-fitting portion formed between the upper and lower press-fitting portions.

このように、本実施の形態の上記構成によれば、ステアリングシャフト２とブラケット１との圧入箇所の周方向長さが長くなったとしても、圧入箇所の軸方向長さが長くなるのが抑制されるので、圧入箇所の締め代を確保しつつ圧入荷重を十分に低減できる。このため、これまでの設備でのステアリングシャフト２とブラケット１の組み立てを可能にできる。 As described above, according to the above-described configuration of the present embodiment, even if the circumferential length of the press-fit portion between the steering shaft 2 and the bracket 1 is increased, the length of the press-fit portion in the axial direction is suppressed. Therefore, the press-fitting load can be sufficiently reduced while securing the interference at the press-fitting portion. Therefore, it is possible to assemble the steering shaft 2 and the bracket 1 using conventional equipment.

また、本実施の形態では、ブラケット１がアルミで形成されるとともに、ステアリングシャフト２が鉄で形成されていて、ブラケット１の線膨張係数がステアリングシャフト２の線膨張係数よりも大きい。このため、車両走行時に緩衝器支持装置Ａが温められると締め代が小さくなってしまう。このような場合、車両走行時のステアリングシャフト２の抜け荷重を確保するには締め代を小さくするのが難しく、締め代の調整によってステアリングシャフト２の圧入荷重を低減するのが極めて難しい。 Further, in this embodiment, the bracket 1 is made of aluminum and the steering shaft 2 is made of iron, and the linear expansion coefficient of the bracket 1 is larger than that of the steering shaft 2 . Therefore, when the shock absorber support device A is warmed while the vehicle is running, the tightening margin becomes small. In such a case, it is difficult to reduce the tightening margin in order to secure the pull-out load of the steering shaft 2 when the vehicle is running, and it is extremely difficult to reduce the press-fit load of the steering shaft 2 by adjusting the tightening margin.

このため、ブラケット１の線膨張係数がステアリングシャフト２の線膨張係数よりも大きい場合には、ブラケット１がアルミ製、ステアリングシャフト２が鉄製である場合に限らず、締め代の調整で圧入荷重を十分に低減するのが極めて難しい。よって、このような場合には、本実施の形態のようにステアリングシャフト２とブラケット１の圧入箇所を軸方向に複数設けて圧入荷重を低減するのが特に有効である。しかし、ブラケット１とステアリングシャフト２が同一素材で形成されていてもよい。 Therefore, when the coefficient of linear expansion of the bracket 1 is larger than that of the steering shaft 2, regardless of whether the bracket 1 is made of aluminum or the steering shaft 2 is made of iron, the press-fit load can be reduced by adjusting the interference. Extremely difficult to reduce sufficiently. Therefore, in such a case, it is particularly effective to reduce the press-fitting load by providing a plurality of press-fitting portions of the steering shaft 2 and the bracket 1 in the axial direction as in the present embodiment. However, the bracket 1 and the steering shaft 2 may be made of the same material.

また、本実施の形態では、ステアリングシャフト２が大径部６と、外径がこの大径部６の外径よりも小さい中径部５とを有する。その一方、ステアリングシャフト２が挿入される挿通孔３は、大孔部３ｂと、径がこの大孔部３ｂの径よりも小さい小孔部３ａとを有し、大径部６が大孔部３ｂに圧入されるとともに、中径部５が小孔部３ａに圧入される。 Further, in the present embodiment, the steering shaft 2 has a large diameter portion 6 and a medium diameter portion 5 having an outer diameter smaller than the outer diameter of the large diameter portion 6 . On the other hand, the insertion hole 3 into which the steering shaft 2 is inserted has a large hole portion 3b and a small hole portion 3a whose diameter is smaller than the diameter of the large hole portion 3b. 3b, and the medium-diameter portion 5 is press-fitted into the small hole portion 3a.

当該構成によれば、中径部５が大孔部３ｂ内を容易に通過できるので、ステアリングシャフト２とブラケット１を組み立てる際の圧入ストロークを短くできるとともに圧入時間を短縮できる。さらには、中径部５が大孔部３ｂ内を通過しても、この大孔部３ｂを拡径したり、中径部５が大孔部３ｂの周壁に強く擦りつけられて周壁の表面状態が変わったりしないので、大径部６の大孔部３ｂへの圧入条件を安定化できる。 According to this configuration, the medium-diameter portion 5 can easily pass through the inside of the large hole portion 3b, so that the press-fitting stroke and the press-fitting time when assembling the steering shaft 2 and the bracket 1 can be shortened. Furthermore, even if the middle diameter portion 5 passes through the inside of the large hole portion 3b, the diameter of the large hole portion 3b may be expanded, or the middle diameter portion 5 may be strongly rubbed against the peripheral wall of the large hole portion 3b, and the surface of the peripheral wall may be damaged. Since the state does not change, the conditions for press-fitting the large diameter portion 6 into the large hole portion 3b can be stabilized.

また、本実施の形態では、ステアリングシャフト２が大径部６と中径部５との間に設けられて外径が大径部６及び中径部５の外径よりも小さい小径部４を有している。当該構成によれば、小径部４が圧入工程の何れの段階でも圧入されないので、小径部４については加工精度を落とせる。このため、ステアリングシャフト２の加工を容易にできる。 Further, in the present embodiment, the steering shaft 2 has a small diameter portion 4 provided between the large diameter portion 6 and the medium diameter portion 5 and having an outer diameter smaller than that of the large diameter portion 6 and the medium diameter portion 5 . have. According to this configuration, the small-diameter portion 4 is not press-fitted at any stage of the press-fitting process, so the machining accuracy of the small-diameter portion 4 can be lowered. Therefore, machining of the steering shaft 2 can be facilitated.

さらに、本実施の形態では、ステアリングシャフト２が小径部４と大径部６との間に設けられて外径が小径部４の外径よりも大きく大径部６の外径よりも小さいガイド部７を有している。当該構成によれば、中径部５に遅れて大径部６が圧入される場合であっても、中径部５の圧入開始時にガイド部７が大孔部３ｂ内に挿入されるようにしておけば、ステアリングシャフト２が挿通孔３に対して傾くのを防止できる。 Further, in the present embodiment, the steering shaft 2 is provided between the small diameter portion 4 and the large diameter portion 6 and has an outer diameter larger than that of the small diameter portion 4 and smaller than that of the large diameter portion 6. It has a part 7. According to this configuration, even if the large-diameter portion 6 is press-fitted behind the medium-diameter portion 5, the guide portion 7 is inserted into the large hole portion 3b when the medium-diameter portion 5 starts to be press-fitted. By doing so, it is possible to prevent the steering shaft 2 from tilting with respect to the insertion hole 3 .

なお、圧入荷重を安定化させる上では、上下の圧入箇所の軸方向長さが近い方が好ましいが、これらの長さは適宜変更できる。また、ガイド部７の外径は、小径部４の外径よりも大きく、大径部６の外径よりも小さい範囲で適宜変更できる。さらには、ガイド部７自体を廃するとしてもよい。 In order to stabilize the press-fitting load, it is preferable that the upper and lower press-fitting portions are close to each other in the axial direction, but these lengths can be changed as appropriate. Further, the outer diameter of the guide portion 7 can be appropriately changed within a range larger than the outer diameter of the small diameter portion 4 and smaller than the outer diameter of the large diameter portion 6 . Furthermore, the guide portion 7 itself may be eliminated.

また、小径部４を廃して中径部５を延長し、この中径部５がガイド部７又は大径部６に直接連なる構造にしてもよい。そして、中径部５がガイド部７に連なる場合には、ガイド部７の外径は、中径部５の外径よりも大きく、大径部６の外径よりも小さい範囲で適宜変更できる。 Alternatively, the small-diameter portion 4 may be eliminated and the medium-diameter portion 5 may be extended so that the medium-diameter portion 5 directly connects to the guide portion 7 or the large-diameter portion 6 . When the intermediate diameter portion 5 is connected to the guide portion 7, the outer diameter of the guide portion 7 can be appropriately changed within a range larger than the outer diameter of the intermediate diameter portion 5 and smaller than the outer diameter of the large diameter portion 6. .

また、本実施の形態では、中径部５と小孔部３ａの周壁との接触部が上側の圧入箇所、大径部６と大孔部３ｂの周壁との接触部が下側の圧入箇所となっており、圧入箇所の軸と穴の径が上下で異なる構造となっている。しかし、ステアリングシャフト２とブラケット１の圧入箇所が軸方向に複数あって、圧入箇所の間に非圧入箇所ができるようになっている限り、圧入箇所の数、及び圧入箇所の構造は適宜変更できる。 In the present embodiment, the contact portion between the medium diameter portion 5 and the peripheral wall of the small hole portion 3a is the upper press-fit location, and the contact portion between the large diameter portion 6 and the peripheral wall of the large hole portion 3b is the lower press-fit location. It has a structure in which the diameter of the shaft and the hole at the press-fitting part differs between the top and bottom. However, as long as the steering shaft 2 and the bracket 1 have a plurality of press-fit points in the axial direction and there are non-press-fit points between the press-fit points, the number of press-fit points and the structure of the press-fit points can be changed as appropriate. .

例えば、図４に示す第一の変形例に係る緩衝器支持装置Ａ１のように、ステアリングシャフト２Ａが第一、第二の大径部６０，６１と、第一、第二の大径部６０，６１の間に設けられて外径が第一、第二の大径部６０，６１の外径よりも小さい小径部４０とを有し、第一、第二の大径部６０，６１がブラケット１Ａに形成される挿通孔３Ａにおいて内径の同一な部分３ｅにそれぞれ圧入されていてもよい。なお、ここでいう同一とは、完全同一のみに限られず、製造上の誤差を許容する概念である。 For example, like the shock absorber support device A1 according to the first modified example shown in FIG. , 61 and has a smaller outer diameter than the outer diameters of the first and second large diameter portions 60 and 61, and the first and second large diameter portions 60 and 61 are They may be press-fitted into portions 3e having the same inner diameter in the insertion holes 3A formed in the bracket 1A. Note that the term “same” as used herein is not limited to being exactly the same, but is a concept that allows manufacturing errors.

上記構成によれば、第一、第二の大径部６０，６１と挿通孔３Ａの周壁との接触部がそれぞれ上下の圧入箇所となり、これらの間に小径部４０によって非圧入箇所が形成される。この場合、他の大径部と離間配置される大径部を増やして圧入箇所を三以上にしてもよく、上下に隣り合う大径部の間に外径が大径部の外径よりも小さく小径部の外径より大きい一以上のガイド部を設けてもよい。 According to the above configuration, the contact portions between the first and second large-diameter portions 60 and 61 and the peripheral wall of the insertion hole 3A are the upper and lower press-fit portions, respectively, and the small-diameter portion 40 forms a non-press-fit portion therebetween. be. In this case, the number of press-fit portions may be increased to three or more by increasing the number of large-diameter portions that are spaced apart from other large-diameter portions, and the outer diameter between the vertically adjacent large-diameter portions may be larger than the outer diameter of the large-diameter portions. One or more guide portions may be provided that are small and larger than the outer diameter of the small diameter portion.

また、図５に示す第二の変形例に係る緩衝器支持装置Ａ２のように、ブラケット１Ｂに形成される挿通孔３Ｂが第一、第二の小孔部３ｆ，３ｇと、第一、第二の小孔部３ｆ，３ｇの間に設けられて径が第一、第二の小孔部３ｆ，３ｇの径よりも大きい大孔部３ｈとを有し、ステアリングシャフト２Ｂの外径が同一な挿入部２ｃが第一、第二の小孔部３ｆ，３ｇにそれぞれ圧入されていてもよい。なお、ここでいう同一も、完全同一のみに限られず、製造上の誤差を許容する概念である。 Moreover, like the shock absorber support device A2 according to the second modification shown in FIG. A large hole portion 3h is provided between the two small hole portions 3f and 3g and has a larger diameter than the first and second small hole portions 3f and 3g, and the outer diameter of the steering shaft 2B is the same. The insertion portion 2c may be press-fitted into the first and second small holes 3f and 3g, respectively. It should be noted that the same here is not limited to being exactly the same, but is a concept that allows manufacturing errors.

上記構成によれば、ステアリングシャフト２Ｂと第一、第二の小孔部３ｆ，３ｇの周壁との接触部がそれぞれ上下の圧入箇所となり、これらの間に大孔部３ｈによって非圧入箇所が形成される。この場合、他の小孔部と離間配置される小孔部を増やして圧入箇所を三以上にしてもよく、上下に隣り合う小孔部の間に径が小孔部の径より大きく大孔部の径より小さい一以上のガイド孔部を設けてもよい。 According to the above configuration, the contact portions between the steering shaft 2B and the peripheral walls of the first and second small hole portions 3f and 3g are the upper and lower press-fit portions, respectively, and the large hole portions 3h form non-press-fit portions therebetween. be done. In this case, the number of small holes spaced apart from other small holes may be increased so that the number of press-fitting locations is three or more. One or more guide holes smaller than the diameter of the portion may be provided.

このように、図４，５に示す第一、第二の変形例に係る緩衝器支持装置Ａ１，Ａ２によれば、ステアリングシャフト２Ａ，２Ｂとブラケット１Ａ，１Ｂの圧入箇所を軸方向に複数設けるための構成を容易に実現できるとともに、圧入箇所の増減を容易にできる。 As described above, according to the shock absorber support devices A1 and A2 according to the first and second modifications shown in FIGS. The configuration for this can be easily realized, and the number of press-fitting portions can be easily increased or decreased.

以上、本発明の好ましい実施の形態を詳細に説明したが、特許請求の範囲から逸脱しない限り、改造、変形、及び変更が可能である。 Although preferred embodiments of the invention have been described in detail above, modifications, variations, and changes are possible without departing from the scope of the claims.

Ａ，Ａ１，Ａ２・・・緩衝器支持装置、Ｄ・・・緩衝器、Ｓ・・・懸架装置、Ｗ・・・前輪（車輪）、１，１Ａ，１Ｂ・・・ブラケット、２，２Ａ，２Ｂ・・・ステアリングシャフト、３，３Ａ，３Ｂ・・・挿通孔、３ａ，３ｆ，３ｇ・・・小孔部、３ｂ，３ｈ・・・大孔部、４，４０・・・小径部、５・・・中径部、６，６０，６１・・・大径部、７・・・ガイド部
A, A1, A2... Shock absorber support device, D... Shock absorber, S... Suspension system, W... Front wheel (wheel), 1, 1A, 1B... Bracket, 2, 2A, 2B Steering shaft 3, 3A, 3B Insertion hole 3a, 3f, 3g Small hole portion 3b, 3h Large hole portion 4, 40 Small diameter portion 5 ...Medium diameter portion, 6, 60, 61...Large diameter portion, 7...Guide portion

Claims (7)

ステアリングシャフトと、
前記ステアリングシャフトが圧入される挿通孔が形成されるとともに緩衝器に連結されるブラケットとを備え、
前記ステアリングシャフトと前記ブラケットとの圧入箇所が軸方向に複数設けられており、
前記挿通孔は、第一、第二の小孔部と、前記第一、第二の小孔部の間に設けられて径が前記第一、第二の小孔部の径よりも大きい大孔部とを有し、
前記ステアリングシャフトが前記第一、第二の小孔部に圧入されている
ことを特徴とする緩衝器支持装置。 a steering shaft and
a bracket formed with an insertion hole into which the steering shaft is press-fitted and connected to the shock absorber;
A plurality of press-fitting portions of the steering shaft and the bracket are provided in the axial direction ,
The insertion hole is provided between first and second small holes and between the first and second small holes and has a diameter larger than that of the first and second small holes. and a hole;
The steering shaft is press-fitted into the first and second small holes
A shock absorber support device characterized by: ステアリングシャフトと、a steering shaft and
前記ステアリングシャフトが圧入される挿通孔が形成されるとともに緩衝器に連結されるブラケットとを備え、a bracket formed with an insertion hole into which the steering shaft is press-fitted and connected to the shock absorber;
前記ステアリングシャフトと前記ブラケットとの圧入箇所が軸方向に複数設けられており、A plurality of press-fitting portions of the steering shaft and the bracket are provided in the axial direction,
前記ステアリングシャフトは、大径部と、外径が前記大径部の外径よりも小さい中径部とを有し、The steering shaft has a large-diameter portion and a medium-diameter portion having an outer diameter smaller than the outer diameter of the large-diameter portion,
前記挿通孔は、大孔部と、径が前記大孔部の径よりも小さい小孔部とを有し、The insertion hole has a large hole portion and a small hole portion having a smaller diameter than the diameter of the large hole portion,
前記大径部が前記大孔部に圧入されるとともに、While the large diameter portion is press-fitted into the large hole portion,
前記中径部が前記小孔部に圧入されているThe medium-diameter portion is press-fitted into the small hole portion.
ことを特徴とする緩衝器支持装置。A shock absorber support device characterized by: 前記ステアリングシャフトは、前記大径部と前記中径部との間に設けられて外径が前記大径部及び前記中径部の外径よりも小さい小径部を有している
ことを特徴とする請求項２に記載の緩衝器支持装置。 The steering shaft has a small-diameter portion provided between the large-diameter portion and the medium-diameter portion and having an outer diameter smaller than the outer diameters of the large-diameter portion and the medium-diameter portion. The shock absorber support device according to claim 2 . 前記ステアリングシャフトは、前記小径部と前記大径部との間に設けられて外径が前記小径部の外径よりも大きく前記大径部の外径よりも小さいガイド部を有している
ことを特徴とする請求項３に記載の緩衝器支持装置。 The steering shaft has a guide portion provided between the small diameter portion and the large diameter portion and having an outer diameter larger than that of the small diameter portion and smaller than that of the large diameter portion. The shock absorber support device according to claim 3 , characterized by: 前記ステアリングシャフトは、前記大径部と前記中径部との間に設けられて外径が前記中径部の外径よりも大きく前記大径部の外径よりも小さいガイド部を有している
ことを特徴とする請求項２に記載の緩衝器支持装置。 The steering shaft has a guide portion provided between the large-diameter portion and the medium-diameter portion and having an outer diameter larger than that of the medium-diameter portion and smaller than that of the large-diameter portion. 3. The shock absorber support device according to claim 2 , characterized in that: 前記ブラケットの線膨張係数は、前記ステアリングシャフトの線膨張係数よりも大きい
ことを特徴とする請求項１から５の何れか一項に記載の緩衝器支持装置。 The shock absorber support device according to any one of claims 1 to 5 , wherein the linear expansion coefficient of the bracket is larger than the linear expansion coefficient of the steering shaft. 車両の車輪を支持する緩衝器と、
請求項１から６の何れか一項に記載の緩衝器支持装置とを備え、
前記緩衝器支持装置で前記緩衝器を支持する
ことを特徴とする懸架装置。 a shock absorber supporting the wheels of the vehicle;
A buffer support device according to any one of claims 1 to 6 ,
A suspension system, wherein the shock absorber is supported by the shock absorber support device.
JP2018132182A 2018-07-12 2018-07-12 Shock absorber support system and suspension system Active JP7137382B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2018132182A JP7137382B2 (en) 2018-07-12 2018-07-12 Shock absorber support system and suspension system
PCT/JP2019/024651 WO2020012915A1 (en) 2018-07-12 2019-06-21 Shock absorber support device and suspension device
DE112019003548.7T DE112019003548T5 (en) 2018-07-12 2019-06-21 SHOCK ABSORBER SUPPORT DEVICE AND HANGING DEVICE
TW108123532A TWI813717B (en) 2018-07-12 2019-07-04 Shock absorber supporting device and suspension device

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Citations (3)

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JP2008290510A (en) 2007-05-22 2008-12-04 Yamaha Motor Co Ltd Fastening structure of steering shaft and vehicle equipped with it
JP2013111676A (en) 2011-11-25 2013-06-10 Toyota Motor Corp Press fitting method and press fitting device

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JPS60217029A (en) * 1984-04-11 1985-10-30 Mitsuba Denki Seisakusho:Kk Method of press fitting shaft
JPH0858660A (en) * 1994-08-19 1996-03-05 Kayaba Ind Co Ltd Front fork mounting device
JPH09249141A (en) * 1996-03-14 1997-09-22 Toyoda Mach Works Ltd Power steering device

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2003112634A (en) 2001-10-04 2003-04-15 Koyo Seiko Co Ltd Shock absorbing steering device
JP2008290510A (en) 2007-05-22 2008-12-04 Yamaha Motor Co Ltd Fastening structure of steering shaft and vehicle equipped with it
JP2013111676A (en) 2011-11-25 2013-06-10 Toyota Motor Corp Press fitting method and press fitting device

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JP2020006907A (en) 2020-01-16
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TWI813717B (en) 2023-09-01
DE112019003548T5 (en) 2021-03-25

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