JP6227426B2 - Automotive propulsion shaft - Google Patents

Automotive propulsion shaft Download PDF

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JP6227426B2
JP6227426B2 JP2014007384A JP2014007384A JP6227426B2 JP 6227426 B2 JP6227426 B2 JP 6227426B2 JP 2014007384 A JP2014007384 A JP 2014007384A JP 2014007384 A JP2014007384 A JP 2014007384A JP 6227426 B2 JP6227426 B2 JP 6227426B2
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elastic body
tube
propulsion shaft
outer tube
peripheral surface
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JP2015135167A (en
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和秀 古口
和秀 古口
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Showa Corp
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Showa Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
    • F16D3/76—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members shaped as an elastic ring centered on the axis, surrounding a portion of one coupling part and surrounded by a sleeve of the other coupling part

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Power Transmission Devices (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Description

本発明は、自動車用推進軸に関する。   The present invention relates to an automobile propulsion shaft.

自動車に搭載されて前後方向に延在する自動車用推進軸は、自動車前部に搭載された変速機と自動車後部に搭載された終減速装置とを連結し、変速機の動力により回転することで動力を終減速装置に伝達する。   A vehicle propulsion shaft that is mounted on a vehicle and extends in the front-rear direction connects a transmission mounted on the front of the vehicle and a final reduction gear mounted on the rear of the vehicle, and rotates by the power of the transmission. Power is transmitted to the final reduction gear.

ところで、自動車では、前方からの衝突エネルギーを吸収するため、原動機及び変速機を後退させてエンジンルームを含む車両前部のボディパネルが変形可能となることが求められている。
そして、原動機及び変速機の後退を図るため、自動車用推進軸では、前方からの衝突による荷重を受けた場合に短縮することが求められている。
このような短縮可能な自動車用推進軸の一つに、直径の異なる２つの管体（以下、径の大きい方を「外管」、径の小さい方を「内管」という場合がある。）と、その外管と内管との間に介在して外管と内管とを連結する弾性体と、を備えたものがある。そして、前方からの衝突による荷重を受けて前側に配置された管体が後方に移動し、自動車用推進軸が短縮するように構成されている。 By the way, in the automobile, in order to absorb the collision energy from the front, it is required that the body panel in the front portion of the vehicle including the engine room can be deformed by moving the prime mover and the transmission backward.
And in order to reverse | retreat a motor | power_engine and a transmission, in the propulsion shaft for motor vehicles, when receiving the load by the collision from the front, shortening is calculated | required.
One such automotive propulsion shaft that can be shortened includes two tubular bodies having different diameters (hereinafter, the larger diameter may be referred to as an “outer tube” and the smaller diameter may be referred to as an “inner tube”). And an elastic body that is interposed between the outer tube and the inner tube and connects the outer tube and the inner tube. And the pipe body arrange | positioned at the front side receives the load by the collision from the front, moves back, and it is comprised so that the propulsion shaft for motor vehicles may shorten.

他方で、上記した短縮可能な自動車用推進軸は、２つの管体の一方が回転した場合に、その管体を保持する弾性体が摺動してしまい、２つの管体の他方に回転運動が伝達されないおそれ、又は回転運動のトルクが損なわれて伝達するおそれがある。
このような問題を解決するため、下記の特許文献では次のような構成になっている。 On the other hand, in the above-described shortenable automobile propulsion shaft, when one of the two tubular bodies rotates, the elastic body that holds the tubular body slides, and rotational movement is caused to the other of the two tubular bodies. May not be transmitted, or the torque of the rotational motion may be impaired and transmitted.
In order to solve such a problem, the following patent document has the following configuration.

特許文献１では、弾性体の内周面が内管の外周面に加硫接着（溶着）され、弾性体の外周面が大径パイプの内周面に接着剤により接着されている。
特許文献２では、アルミニウム合金で製造された外管の内周面に径方向内側に押し出し成形にてリブが突設され、そのリブが弾性体の外周面に形成された凹部に嵌合している。また、弾性体の内周面が接着剤により内管に接着されている。
特許文献３では、弾性部材が外管と内管との間に径方向に圧縮された状態で介設されている。 In Patent Document 1, the inner peripheral surface of the elastic body is vulcanized and bonded (welded) to the outer peripheral surface of the inner tube, and the outer peripheral surface of the elastic body is bonded to the inner peripheral surface of the large-diameter pipe with an adhesive.
In Patent Document 2, a rib is protruded from the inner peripheral surface of the outer tube made of an aluminum alloy in the radial direction by extrusion, and the rib is fitted into a recess formed on the outer peripheral surface of the elastic body. Yes. The inner peripheral surface of the elastic body is bonded to the inner tube with an adhesive.
In Patent Document 3, the elastic member is interposed between the outer tube and the inner tube in a state compressed in the radial direction.

特開平０６−２１３２２７号公報Japanese Patent Laid-Open No. 06-213227 実開平０１−９１１１５号公報Japanese Utility Model Publication No. 01-91115 特開２００６−６４１７９号公報JP 2006-64179 A

ここで、自動車用推進軸の回転運動の荷重（トルク）は比較的大きいが、衝突による自動車用推進軸の短縮に要求される荷重は比較的小さい。
このため、特許文献１の技術のように、接着剤の強度が自動車用推進軸の回転運動の荷重（トルク）に耐えられるように設定されると、衝突による荷重が比較的小さい場合に接着剤が破断せずに自動車用推進軸の短縮が図れないというおそれがある。 Here, although the load (torque) of the rotational motion of the automobile propulsion shaft is relatively large, the load required for shortening the automobile propulsion shaft due to a collision is relatively small.
For this reason, when the strength of the adhesive is set to withstand the load (torque) of the rotational motion of the automobile propulsion shaft as in the technique of Patent Document 1, the adhesive is used when the load due to the collision is relatively small. There is a risk that the automobile propulsion shaft cannot be shortened without breaking.

また、特許文献２の技術によれば、外管の材質がアルミニウム合金に限定されており、外管に接合される対象の材質も限定されるという不利益がある。   Moreover, according to the technique of Patent Document 2, the material of the outer tube is limited to the aluminum alloy, and there is a disadvantage that the material of the object to be joined to the outer tube is also limited.

さらに、特許文献３の技術によれば、停止部材を用いて位置ずれしないように、外管と内管との間に弾性体を圧着させる必要があり、組み立て作業が煩わしかった。
また、特許文献３の技術によれば、弾性体の劣化により圧着力が弱まり、弾性体が管体を保持できずに摺動するおそれがある。 Furthermore, according to the technique of Patent Document 3, it is necessary to press the elastic body between the outer tube and the inner tube so as not to be displaced using the stop member, and the assembling work is troublesome.
Moreover, according to the technique of patent document 3, there exists a possibility that a crimping | compression-bonding force may weaken by deterioration of an elastic body, and an elastic body may be unable to hold | maintain a tubular body and to slide.

本発明は、このような課題を解決するために創作されたものであり、比較的小さい荷重であっても短縮することができ、外管及び内管がアルミ材に限定されず、組み立ての作業性が良く、弾性体が劣化しても確実に回転運動を伝達できる自動車用推進軸を提供することを目的とする。   The present invention was created to solve such problems, and can be shortened even with a relatively small load. The outer tube and the inner tube are not limited to the aluminum material, and the assembly work is performed. An object of the present invention is to provide a propulsion shaft for an automobile that has good performance and can reliably transmit rotational motion even when an elastic body deteriorates.

前記課題を解決するため、本発明に係る自動車用推進軸は、外管と、一端が前記外管の内側に収容される内管と、前記外管と内管との間に介在する弾性体とを備え、衝突により短縮する自動車用推進軸であって、前記弾性体は、前記外管の内周面に固着される環状の外側弾性体と、前記内管の外周面に固着されるとともに、前記外側弾性体内に嵌合される環状の内側弾性体と、を有し、前記外側弾性体の内周面には、径方向内側に突出する複数の第１突出部が形成され、前記内側弾性体の外周面には、径方向外側に突出する複数の第２突出部が形成され、前記嵌合により、前記第１突出部と前記第２突出部とが周方向に交互に並ぶとともに、前記第１突出部と前記第２突出部とが径方向又は／及び周方向に押し潰された状態となっていることを特徴とする。   In order to solve the above problems, an automobile propulsion shaft according to the present invention includes an outer tube, an inner tube having one end accommodated inside the outer tube, and an elastic body interposed between the outer tube and the inner tube. And the elastic body is fixed to the outer peripheral surface of the inner tube and the annular outer elastic member fixed to the inner peripheral surface of the outer tube. An annular inner elastic body fitted into the outer elastic body, and a plurality of first projecting portions protruding radially inward are formed on an inner peripheral surface of the outer elastic body, A plurality of second projecting portions projecting radially outward are formed on the outer peripheral surface of the elastic body, and by the fitting, the first projecting portions and the second projecting portions are alternately arranged in the circumferential direction, The first protrusion and the second protrusion are in a state of being crushed in the radial direction and / or the circumferential direction. And features.

前記発明に係る自動車用推進軸によれば、外側弾性体は外管に固着され、内側弾性体は内管に固着されている。また、外側弾性体が回転すると、外側弾性体の第１突出部が周方向に移動して第２突出部を周方向に押圧し、内側弾性体が回転するようになっている。
以上から、自動車用推進軸の回転運動時に、外管、外側弾性体、内側弾性体、内管のそれぞれが互いに摺動することが抑制されており、回転運動のトルクが損なわれることなく確実に伝達される。
また、上記する構成は、従来技術で説明したような弾性体の圧着により摺動を抑制するといった構成にはなっていないため、弾性体が劣化したとしても、回転運動のトルクが損なわれるおそれがない。 According to the automobile propulsion shaft according to the invention, the outer elastic body is fixed to the outer tube, and the inner elastic body is fixed to the inner tube. When the outer elastic body rotates, the first protruding portion of the outer elastic body moves in the circumferential direction and presses the second protruding portion in the circumferential direction, so that the inner elastic body rotates.
From the above, the outer tube, the outer elastic body, the inner elastic body, and the inner tube are restrained from sliding with each other during the rotational movement of the automobile propulsion shaft, and the rotational movement torque can be reliably lost. Communicated.
In addition, since the above-described configuration is not configured to suppress sliding by pressing the elastic body as described in the related art, even if the elastic body is deteriorated, there is a risk that the torque of the rotational motion is impaired. Absent.

一方で、前後方向の荷重が外管に作用した場合に、外側弾性体の第１突出部が内側弾性体の第２突出部によりガイドされながら外管がスライドし、自動車用推進軸が短縮する。
また、第１突出部と第２突出部とが径方向又は／及び周方向に押し潰された状態となっているため、第１突出部と第２突出部との弾性力により外側弾性体１１と内側弾性体１２とが圧着している。このため、外側弾性体に対して内側弾性体が径方向又は／及び周方向にガタつくことが防止されている。
さらに、上記する構成によれば、第１突出部と第２突出部とが径方向又は／及び周方向の押し潰し量を調整することで外側弾性体と内側弾性体との圧着力を調整し、外管又は内管がスライドする場合の荷重を設定することができる。
このため、押し潰し量を調整し、衝突時の比較的弱い荷重で外管又は内管がスライドできるように設定するとともに、組み立て時に作用する荷重や自動車走行時に作用する荷重などの極めて弱い荷重では、外管又は内管がスライドしないように設定することができる。 On the other hand, when a longitudinal load acts on the outer tube, the outer tube slides while the first protrusion of the outer elastic body is guided by the second protrusion of the inner elastic body, and the vehicle propulsion shaft is shortened. .
Moreover, since the 1st protrusion part and the 2nd protrusion part are in the state crushed in the radial direction or / and the circumferential direction, the outer side elastic body 11 with the elastic force of a 1st protrusion part and a 2nd protrusion part And the inner elastic body 12 are pressure-bonded. For this reason, the inner elastic body is prevented from rattling in the radial direction and / or the circumferential direction with respect to the outer elastic body.
Further, according to the above-described configuration, the first projecting portion and the second projecting portion adjust the crimping force between the outer elastic body and the inner elastic body by adjusting the squeezing amount in the radial direction and / or the circumferential direction. The load when the outer tube or the inner tube slides can be set.
For this reason, the crushing amount is adjusted so that the outer tube or the inner tube can slide with a relatively weak load at the time of collision. The outer tube or the inner tube can be set not to slide.

また、前記発明によれば、外管及び内管はアルミ材に限定されないため、接合される対象の材質も限定されるという不利益を回避できる。
さらに、外側弾性体と内側弾性体とのそれぞれは外管、内管に固着されているため、外側弾性体内に内側弾性体を挿入して嵌合させる際に、外側弾性体と内側弾性体とが位置ずれすることなく、組み立てることができ、組立作業の容易化を図ることができる。 Moreover, according to the said invention, since an outer tube and an inner tube are not limited to an aluminum material, the disadvantage that the material of the object joined is also limited can be avoided.
Furthermore, since each of the outer elastic body and the inner elastic body is fixed to the outer tube and the inner tube, when inserting and fitting the inner elastic body into the outer elastic body, the outer elastic body and the inner elastic body Can be assembled without being displaced, and the assembling work can be facilitated.

また、前記内側弾性体の端部に、径方向外側に延在して前記外側弾性体の端面及び前記外管の端面に当接する当接部が設けられていることが好ましい。   In addition, it is preferable that an end portion of the inner elastic body is provided with a contact portion that extends radially outward and contacts the end surface of the outer elastic body and the end surface of the outer tube.

前記構成によれば、衝突により外管が当接部を破断することで外管内に内管が進入し、自動車用推進軸が短縮するようになる。
このため、当接部の厚みを厚く又は薄くするなど、当接部の形状を変更することで、外管が当接部を破断する場合の破断荷重を変更することができ、自動車用推進軸が短縮する場合の荷重を容易に設定することができる。
また、当接部を備えていない場合、自動車用推進軸が短縮する場合の荷重は、第１突出部及び第２突出部の圧縮量と嵌合長さと摩擦力により変動するおそれがある。しかしながら、当接部を設けることで自動車用推進軸が短縮する場合の荷重を任意に設定することができ、かつ、安定させることができる。
また、組み立て時において、外側弾性体内に内側弾性体を挿入した場合、当接部が外側弾性体の端面及び外管の端面に当接するため、位置決めが容易となる。
また、当接部が外側弾性体と内側弾性体との境目を覆うため、外側弾性体と内側弾性体との間に泥水が浸入することを防止できる。
さらに、内側弾性体に当接部を設けたとしても、組み立てで要求される作業がなく、組み立ての作業性が良い。 According to the above configuration, the outer tube breaks the contact portion due to the collision, so that the inner tube enters the outer tube and the automobile propulsion shaft is shortened.
For this reason, by changing the shape of the contact portion, such as by increasing or decreasing the thickness of the contact portion, the breaking load when the outer tube breaks the contact portion can be changed. Can be easily set.
Further, when the abutting portion is not provided, the load when the automobile propulsion shaft is shortened may vary depending on the compression amount, the fitting length, and the frictional force of the first protrusion and the second protrusion. However, the load when the automobile propulsion shaft is shortened can be arbitrarily set and stabilized by providing the contact portion.
Further, when the inner elastic body is inserted into the outer elastic body during assembly, positioning is facilitated because the abutting portion comes into contact with the end surface of the outer elastic body and the end surface of the outer tube.
Moreover, since the contact portion covers the boundary between the outer elastic body and the inner elastic body, it is possible to prevent muddy water from entering between the outer elastic body and the inner elastic body.
Furthermore, even if the contact portion is provided on the inner elastic body, there is no work required for the assembly, and the workability of the assembly is good.

また、前記外側弾性体の端部に、径方向内側に延在して前記内側弾性体の端面及び前記内管の端面に当接する当接部が設けられていることが好ましい。   Further, it is preferable that an end portion of the outer elastic body is provided with a contact portion that extends radially inward and contacts the end surface of the inner elastic body and the end surface of the inner tube.

前記構成によれば、衝突により内管が当接部を破断することで外管内に内管が進入し、自動車用推進軸が短縮するようになる。
このため、当接部の厚みを厚く又は薄くするなど、当接部の形状を変更することで、外管が当接部を破断する場合の破断荷重を変更することができ、自動車用推進軸が短縮する場合の荷重を容易に設定することができる。
また、当接部を備えていない場合、自動車用推進軸が短縮する場合の荷重は、第１突出部及び第２突出部の圧縮量と嵌合長さと摩擦力により変動するおそれがある。しかしながら、当接部を設けることで自動車用推進軸が短縮する場合の荷重を任意に設定することができ、かつ、安定させることができる。
また、組み立て時において、外側弾性体内に内側弾性体を挿入した場合、当接部が内側弾性体の端面及び内管の端面に当接するため、位置決めが容易となる。
ため、位置決めが容易となる。
さらに、外側弾性体に当接部を設けたとしても、組み立てで要求される作業がなく、組み立ての作業性が良い。 According to the above configuration, the inner tube breaks the contact portion due to the collision, so that the inner tube enters the outer tube, and the automobile propulsion shaft is shortened.
For this reason, by changing the shape of the contact portion, such as by increasing or decreasing the thickness of the contact portion, the breaking load when the outer tube breaks the contact portion can be changed. Can be easily set.
Further, when the abutting portion is not provided, the load when the automobile propulsion shaft is shortened may vary depending on the compression amount, the fitting length, and the frictional force of the first protrusion and the second protrusion. However, the load when the automobile propulsion shaft is shortened can be arbitrarily set and stabilized by providing the contact portion.
Further, when the inner elastic body is inserted into the outer elastic body at the time of assembly, positioning is easy because the contact portion comes into contact with the end surface of the inner elastic body and the end surface of the inner tube.
Therefore, positioning becomes easy.
Furthermore, even if the contact portion is provided on the outer elastic body, there is no work required for the assembly, and the workability of the assembly is good.

第１実施形態に係る推進軸及び軸受構造体を示す全体構成図である。It is a whole lineblock diagram showing the propulsion shaft and bearing structure concerning a 1st embodiment. 図１の枠線Ａで囲まれた範囲を拡大した拡大図である。It is the enlarged view to which the range enclosed by the frame line A of FIG. 1 was expanded. 図２のＢ−Ｂ線断面図である。FIG. 3 is a sectional view taken along line B-B in FIG. 2. 外管が前方からの荷重を受けた場合を示す断面図である。It is sectional drawing which shows the case where an outer tube receives the load from the front. 第１変形例に係る第一推進軸の断面を示す拡大断面図である。It is an expanded sectional view showing the section of the 1st propulsion shaft concerning the 1st modification. 第２変形例に係る第一推進軸の断面を示す拡大断面図である。It is an expanded sectional view showing the section of the 1st propulsion shaft concerning the 2nd modification.

本発明の実施形態について、適宜図面を参照しながら説明する。
図１に示すように、自動車用推進軸１は、フロアパネル（不図示）の下面に固定された軸受構造体２により回転自在に支持され、フロアパネルの下方で車両前部から車両後部に亘って延在する軸部材である。
また、自動車用推進軸１の前部側が車体前部に搭載された変速装置（不図示）に連結され、自動車用推進軸１の後部側が車両後部の終減速装置（不図示）に連結されている。そして、変速装置の動力で自動車用推進軸１が回転し、変速装置からの動力を終減速装置に伝達する役割を果たしている。 Embodiments of the present invention will be described with reference to the drawings as appropriate.
As shown in FIG. 1, the automobile propulsion shaft 1 is rotatably supported by a bearing structure 2 fixed to the lower surface of a floor panel (not shown), and extends from the front of the vehicle to the rear of the vehicle below the floor panel. It is a shaft member extended.
Further, the front side of the automobile propulsion shaft 1 is connected to a transmission (not shown) mounted on the front of the vehicle body, and the rear side of the automobile propulsion shaft 1 is connected to a final reduction gear (not shown) at the rear of the vehicle. Yes. And the propulsion shaft 1 for motor vehicles rotates with the motive power of a transmission, and has played the role which transmits the motive power from a transmission to a final reduction gear.

自動車用推進軸１は、前方寄りに設けられて第１ジョイント５を介して変速装置側の出力軸に連結する第一推進軸３と、後方寄りに設けられて第２ジョイント７を介して終減速装置側の入力軸に連結する第二推進軸４と、第一推進軸３と第二推進軸４とを連結する等速ジョイント６と、を備えている。   The vehicle propulsion shaft 1 includes a first propulsion shaft 3 provided near the front and connected to an output shaft on the transmission side via a first joint 5, and a rear propulsion shaft 3 provided via a second joint 7. A second propulsion shaft 4 coupled to the input shaft on the speed reducer side, and a constant velocity joint 6 coupling the first propulsion shaft 3 and the second propulsion shaft 4 are provided.

第一推進軸３は、第一推進軸３の前方寄りに設けられる円筒形の外管８と、外管８よりも小径であって外管８の後端部の内側から後方に延びる円筒形の内管９と、外管８と内管９との間に介在して外管８と内管９とを連結する環状の弾性体１０と、を備えている。
実施形態に係る外管８及び内管９の材質は、鋼であるが、本発明では外管８と内管９の材質について特に限定されない。 The first propulsion shaft 3 includes a cylindrical outer tube 8 provided closer to the front of the first propulsion shaft 3 and a cylindrical shape having a smaller diameter than the outer tube 8 and extending rearward from the rear end portion of the outer tube 8. And an annular elastic body 10 that is interposed between the outer tube 8 and the inner tube 9 and connects the outer tube 8 and the inner tube 9 to each other.
The material of the outer tube 8 and the inner tube 9 according to the embodiment is steel, but in the present invention, the material of the outer tube 8 and the inner tube 9 is not particularly limited.

図２、図３に示すように、弾性体１０は、弾性変形可能なゴムであり、環状の外側弾性体１１と、外側弾性体１１の内側に配置された環状の内側弾性体１２と、を備えている。
外側弾性体１１は、外径が外管８の内径と同一に形成された円筒形の部材である。
また、加硫接着（溶着）により、外側弾性体１１の外周面が外管８の内周面に固着されており、外管８が回転した場合、外側弾性体１１が摺動することなく、外管８と共に回転するようになっている。
内側弾性体１２は、内径が内管９の外径と同一に形成された円筒形の部材である。
また、加硫接着（溶着）により、内側弾性体１２の内周面が内管９の外周面に固着されており、内側弾性体１２が回転した場合、内管９が摺動することなく、内側弾性体１２と共に回転するようになっている。
そして、外側弾性体１１の内側に内側弾性体１２が嵌合され、外側弾性体１１に固着された外管８と内側弾性体１２に固着された内管９とを連結している。
なお、本実施形態では、外側弾性体１１、内側弾性体１２は、加硫接着（溶着）により外管８、内管９に固着されている。 As shown in FIGS. 2 and 3, the elastic body 10 is an elastically deformable rubber, and includes an annular outer elastic body 11 and an annular inner elastic body 12 disposed inside the outer elastic body 11. I have.
The outer elastic body 11 is a cylindrical member having an outer diameter that is the same as the inner diameter of the outer tube 8.
Further, the outer peripheral surface of the outer elastic body 11 is fixed to the inner peripheral surface of the outer tube 8 by vulcanization adhesion (welding), and when the outer tube 8 rotates, the outer elastic member 11 does not slide, It rotates with the outer tube 8.
The inner elastic body 12 is a cylindrical member having an inner diameter that is the same as the outer diameter of the inner tube 9.
Further, by vulcanization adhesion (welding), the inner peripheral surface of the inner elastic body 12 is fixed to the outer peripheral surface of the inner tube 9, and when the inner elastic body 12 rotates, the inner tube 9 does not slide, It rotates with the inner elastic body 12.
An inner elastic body 12 is fitted inside the outer elastic body 11, and the outer tube 8 fixed to the outer elastic body 11 and the inner tube 9 fixed to the inner elastic body 12 are connected.
In the present embodiment, the outer elastic body 11 and the inner elastic body 12 are fixed to the outer tube 8 and the inner tube 9 by vulcanization adhesion (welding).

図３に示すように、外側弾性体１１の内周面に、径方向内側に突出する第１突出部１３が周方向に等間隔で６つ形成されている。
一方、内側弾性体１２の内周面にも、径方向外側に突出する第２突出部１４が周方向に等間隔で６つ形成されている。
そして、第１突出部１３と第２突出部１４とが周方向にずれて設けられ、第１突出部１３と第２突出部１４とが周方向に交互に並んでおり、第１突出部１３と第２突出部１４とが係合している。
このため、外管８が回転すると、第１突出部１３が周方向へ移動して第２突出部１４を押圧する。そして、第２突出部１４も周方向に移動して内管９が回転し、外管８の回転運動が内管９に伝達される。
また、外管８が前方から荷重を受けた場合には、図４の矢印Ｃに示すように、外側弾性体１１の第１突出部１３が内側弾性体１２の第２突出部１４にガイドされながら、外管８と外側弾性体１１とが後方にスライドし、第一推進軸３が短縮する。そして、外管８と外側弾性体１１とがさらに後方にスライドした場合に、外側弾性体１１と内側弾性体１２との嵌合状態が解除される。
なお、本実施形態では、第１突出部１３と第２突出部１４とが６個ずつ形成されているが、本発明はこれに限定されるものでなく、適宜変更してもよいものである。 As shown in FIG. 3, six first protrusions 13 protruding radially inward are formed on the inner peripheral surface of the outer elastic body 11 at equal intervals in the circumferential direction.
On the other hand, six second projecting portions 14 projecting radially outward are also formed on the inner circumferential surface of the inner elastic body 12 at equal intervals in the circumferential direction.
And the 1st protrusion part 13 and the 2nd protrusion part 14 are shifted and provided in the circumferential direction, the 1st protrusion part 13 and the 2nd protrusion part 14 are located in a line with the circumferential direction alternately, and the 1st protrusion part 13 is provided. And the second protrusion 14 are engaged with each other.
For this reason, when the outer tube 8 rotates, the first protrusion 13 moves in the circumferential direction and presses the second protrusion 14. And the 2nd protrusion part 14 also moves to the circumferential direction, the inner tube 9 rotates, and the rotational motion of the outer tube 8 is transmitted to the inner tube 9.
When the outer tube 8 receives a load from the front, the first protrusion 13 of the outer elastic body 11 is guided by the second protrusion 14 of the inner elastic body 12 as shown by an arrow C in FIG. However, the outer tube 8 and the outer elastic body 11 slide backward, and the first propulsion shaft 3 is shortened. And when the outer tube | pipe 8 and the outer side elastic body 11 slide further back, the fitting state of the outer side elastic body 11 and the inner side elastic body 12 is cancelled | released.
In the present embodiment, six first projecting portions 13 and six second projecting portions 14 are formed, but the present invention is not limited to this, and may be changed as appropriate. .

また、第１突出部１３と第２突出部１４とが径方向と周方向とに押し潰されて弾性変形した状態で、外側弾性体１１の内側に内側弾性体１２が嵌合されている。
このため、第１突出部１３と第２突出部１４との弾性力が作用して外側弾性体１１と内側弾性体１２とが圧着している。この結果、外側弾性体１１に対して内側弾性体１２が径方向と周方向にガタつくことが防止されるとともに、外側弾性体１１が後方へスライドし難くなっている。 In addition, the inner elastic body 12 is fitted inside the outer elastic body 11 in a state where the first protruding portion 13 and the second protruding portion 14 are crushed in the radial direction and the circumferential direction and elastically deformed.
For this reason, the elastic force of the 1st protrusion part 13 and the 2nd protrusion part 14 acts, and the outer side elastic body 11 and the inner side elastic body 12 are crimped | bonded. As a result, the inner elastic body 12 is prevented from rattling in the radial direction and the circumferential direction with respect to the outer elastic body 11, and the outer elastic body 11 is difficult to slide backward.

そして、本実施形態では、第１突出部１３と第２突出部１４とにおける径方向及び周方向の押し潰し量が調節されて、外側弾性体１１に対する内側弾性体１２の圧着力が適切なものに設定されている。
ここで、適切な圧着力とは、外管８又は内管９に作用する前後方向に荷重が、例えば自動車の前方からの衝突など比較的弱い荷重を受けた場合に外管８が後方へスライドできる一方で、組み立て時に作用する荷重や自動車走行時に作用する荷重などの極めて弱い荷重の場合には、外管８が後方に又は内管９が前方にスライドしない程度のものをいう。 And in this embodiment, the amount of crimping of the inner side elastic body 12 with respect to the outer side elastic body 11 is appropriate by adjusting the amount of crushing in the radial direction and the circumferential direction in the first protruding part 13 and the second protruding part 14. Is set to
Here, an appropriate pressure-bonding force means that the outer tube 8 slides backward when a load is applied in the front-rear direction acting on the outer tube 8 or the inner tube 9, for example, a relatively weak load such as a collision from the front of an automobile. On the other hand, in the case of a very weak load such as a load acting at the time of assembly or a load acting at the time of traveling of the vehicle, the outer tube 8 does not slide backward or the inner tube 9 does not slide forward.

つぎに、自動車用推進軸１における第一推進軸３の組み立て方法について説明する。
最初に、外管８の後端部の内周面に外側弾性体１１を溶着させるとともに、内管９の先端部の外周面に内側弾性体１２を溶着させる。
つぎに、内側弾性体１２の外周面を押し潰しながら外側弾性体１１内に挿入し、外側弾性体１１内に内側弾性体１２を嵌合させる。
ここで、内側弾性体１２を外側弾性体１１内に挿入する際に、第２突出部１４が摺動する外側弾性体１１には、前方に向かう荷重が作用する一方で、第１突出部１３が摺動する
内側弾性体１２には、後方に向かう荷重が作用するが、外側弾性体１１と内側弾性体１２とのそれぞれは、外管８、内管９に固着されているため、前後方向に位置ずれするおそれがない。このため、外側弾性体１１と内側弾性体１２とが位置ずれしないようにするための治具が不要となっている。 Next, an assembling method of the first propulsion shaft 3 in the automobile propulsion shaft 1 will be described.
First, the outer elastic body 11 is welded to the inner peripheral surface of the rear end portion of the outer tube 8, and the inner elastic body 12 is welded to the outer peripheral surface of the distal end portion of the inner tube 9.
Next, the outer elastic body 11 is inserted into the outer elastic body 11 while crushing the outer peripheral surface of the inner elastic body 12, and the inner elastic body 12 is fitted into the outer elastic body 11.
Here, when the inner elastic body 12 is inserted into the outer elastic body 11, a load toward the front acts on the outer elastic body 11 on which the second protruding portion 14 slides, while the first protruding portion 13. Although the load toward the back acts on the inner elastic body 12 that slides, the outer elastic body 11 and the inner elastic body 12 are fixed to the outer tube 8 and the inner tube 9, respectively. There is no risk of misalignment. For this reason, the jig | tool for preventing position shift of the outer side elastic body 11 and the inner side elastic body 12 is unnecessary.

以上、実施形態に係る自動車用推進軸１によれば、外管８と外側弾性体１１とが固着され、内管９と内側弾性体１２も固着されている。そして、外側弾性体１１が回転すると、第１突出部１３が周方向に移動して第２突出部１４を周方向に押圧し、内側弾性体１２が回転するようになっている
このため、自動車用推進軸１の回転運動時に、外管８、外側弾性体１１、内側弾性体１２、内管９のそれぞれが互いに摺動することが抑制されており、回転運動のトルクが損なわれることなく確実に伝達することができる。
また、上記する実施形態に係る自動車用推進軸１は、従来技術で説明したような弾性体の圧着により摺動を抑制するといった構成にはなっていないため、外側弾性体１１及び内側弾性体１２が劣化したとしても、回転運動のトルクが損なわれるおそれがない。 As described above, according to the automobile propulsion shaft 1 according to the embodiment, the outer tube 8 and the outer elastic body 11 are fixed, and the inner tube 9 and the inner elastic body 12 are also fixed. And when the outer side elastic body 11 rotates, the 1st protrusion part 13 will move to the circumferential direction, the 2nd protrusion part 14 will be pressed to the circumferential direction, and the inner side elastic body 12 will rotate. During the rotational movement of the propulsion shaft 1, the outer tube 8, the outer elastic body 11, the inner elastic body 12, and the inner pipe 9 are restrained from sliding with each other, and the torque of the rotational movement is ensured without loss. Can be communicated to.
In addition, the automobile propulsion shaft 1 according to the above-described embodiment is not configured to suppress sliding by pressing the elastic body as described in the related art, and thus the outer elastic body 11 and the inner elastic body 12. Even if it deteriorates, there is no possibility that the torque of the rotational motion is impaired.

また、上記する実施形態に係る自動車用推進軸１によれば、前方からの衝突による荷重が小さい場合であっても、外管８が後方にスライドするようになっている。このため、エンジン及び変速装置が後方に移動し、自動車の前部で衝突エネルギーを吸収することができる。
さらに、上記する実施形態に係る自動車用推進軸１によれば、外側弾性体１１の第１突出部１３と内側弾性体１２の第２突出部１４との径方向又は／及び周方向の押し潰し量で調整すること、外管８が後方へスライドする場合の荷重を設定することができる。 Further, according to the automobile propulsion shaft 1 according to the above-described embodiment, the outer tube 8 slides backward even when the load due to the collision from the front is small. For this reason, an engine and a transmission can move back and can absorb collision energy in the front part of a car.
Furthermore, according to the automobile propulsion shaft 1 according to the above-described embodiment, the radial or / and circumferential crushing of the first protrusion 13 of the outer elastic body 11 and the second protrusion 14 of the inner elastic body 12 is performed. By adjusting the amount, the load when the outer tube 8 slides backward can be set.

また、上記する実施形態に係る自動車用推進軸１によれば、治具を用いることなく組みたてることができ、組立作業の容易化を図ることができる。
また、上記する実施形態に係る自動車用推進軸１によれば、外管８及び内管９の材質が限定されない。このため、従来技術の説明で挙げた技術のように、外管８及び内管９に接合される対象がアルミニウム合金よりなる部材に限定されるという不利益を回避できる。 Moreover, according to the automobile propulsion shaft 1 according to the above-described embodiment, it can be assembled without using a jig, and the assembly work can be facilitated.
Further, according to the automobile propulsion shaft 1 according to the above-described embodiment, the material of the outer tube 8 and the inner tube 9 is not limited. For this reason, the disadvantage that the object joined to the outer tube 8 and the inner tube 9 is limited to a member made of an aluminum alloy as in the technology mentioned in the description of the prior art can be avoided.

以上、実施形態に係る自動車用推進軸１について説明したが、本発明は実施形態で説明した例に限定されるものでなく、適宜変更してもよいものである。
例えば、図５に示すように、内側弾性体１２の後端部に、径方向外側に延在して外側弾性体１１の端面と外管８の端面に当接する当接部１５を設けてもよい。
これによれば、当接部１５の厚み等を調整することで、外管８が当接部１５を破断して後方に移動する場合の荷重（破断荷重）を設定することができ、自動車用推進軸１が短縮する場合の荷重の設定が容易となる。
また、実施形態の自動車用推進軸１では、外管８が後方へ移動する場合の荷重が、第１突出部１３及び第２突出部１４の圧縮量と嵌合長さと摩擦力により変動するおそれがあるところ、変形例のように当接部１５を設けることで、その荷重を任意に設定でき、かつ、安定させることができる。
また、自動車用推進軸１を組み立てるために、外側弾性体１１に内側弾性体１２を挿入した場合、当接部１５が外側弾性体１１の後端面及び外管８の後端面に当接するため、位置決めが容易となる。
また、当接部１５が外側弾性体１１と内側弾性体１２との境目を覆うため、外側弾性体１１と内側弾性体１２との間に泥水が浸入することが抑制される。
さらに、内側弾性体１２が当接部１５を備えたとしても、自動車用推進軸１の組み立てで要求される作業がないため、組み立ての作業性も良い。 Although the automobile propulsion shaft 1 according to the embodiment has been described above, the present invention is not limited to the example described in the embodiment, and may be changed as appropriate.
For example, as shown in FIG. 5, a contact portion 15 that extends radially outward and contacts the end surface of the outer elastic body 11 and the end surface of the outer tube 8 may be provided at the rear end portion of the inner elastic body 12. Good.
According to this, by adjusting the thickness or the like of the contact portion 15, it is possible to set a load (breakage load) when the outer tube 8 breaks the contact portion 15 and moves rearward. It becomes easy to set the load when the propulsion shaft 1 is shortened.
In the automobile propulsion shaft 1 of the embodiment, the load when the outer tube 8 moves rearward may vary depending on the compression amount, fitting length, and frictional force of the first protrusion 13 and the second protrusion 14. However, by providing the contact portion 15 as in the modification, the load can be arbitrarily set and can be stabilized.
Further, when the inner elastic body 12 is inserted into the outer elastic body 11 in order to assemble the automobile propulsion shaft 1, the contact portion 15 contacts the rear end face of the outer elastic body 11 and the rear end face of the outer tube 8, Positioning is easy.
Further, since the contact portion 15 covers the boundary between the outer elastic body 11 and the inner elastic body 12, mud water is prevented from entering between the outer elastic body 11 and the inner elastic body 12.
Furthermore, even if the inner elastic body 12 includes the contact portion 15, there is no work required for assembling the automobile propulsion shaft 1, so that the workability of assembling is good.

なお、内管９が外管８よりも前側に配置されている場合には、内側弾性体１２の前端部に、径方向外側に延在して外側弾性体１１の前端面と外管８の前端面に当接する当接部１５を設けてもよい。
当該構成によっても、内管９が後方へ移動する場合の荷重を容易かつ任意に設定することができ、自動車用推進軸１が短縮する場合の荷重が安定する。また、位置決めの容易化を図ることがでるとともに、シール効果が得られ、組み立ての作業性も良い。 When the inner tube 9 is disposed on the front side of the outer tube 8, the front end surface of the outer elastic body 11 and the front end surface of the outer elastic body 11 extend radially outward at the front end portion of the inner elastic body 12. A contact portion 15 that contacts the front end surface may be provided.
Also with this configuration, the load when the inner tube 9 moves rearward can be easily and arbitrarily set, and the load when the automobile propulsion shaft 1 is shortened is stabilized. Further, positioning can be facilitated, a sealing effect is obtained, and assembly workability is also good.

また、内側弾性体１２の後端部又は前端部に当接部１５が設けられた第１変形例を説明したが、本発明は、図６に示すように、外側弾性体１１の前端部に、径方向内側に延在して内側弾性体１２の端面と内管９の端面に当接する当接部１６を設けてもよい。
当該構成によっても、外管８が後方へ移動する場合の荷重を容易かつ任意に設定することができ、自動車用推進軸１が短縮する場合の荷重が安定する。また、位置決めの容易化を図ることがでるとともに、外側弾性体１１が当接部１６を備えたとしても、組み立てで要求される作業がないため、組み立ての作業性も良い。
なお、内管９が外管８よりも前側に配置されている場合には、外側弾性体１１の後端部に、径方向内側に延在して内側弾性体１２の端面と内管９の端面に当接する当接部１６を設けてもよい。 Moreover, although the 1st modification by which the contact part 15 was provided in the rear-end part or front-end part of the inner side elastic body 12 was demonstrated, this invention is shown in the front-end part of the outer side elastic body 11, as shown in FIG. A contact portion 16 that extends radially inward and contacts the end surface of the inner elastic body 12 and the end surface of the inner tube 9 may be provided.
Also with this configuration, the load when the outer tube 8 moves rearward can be easily and arbitrarily set, and the load when the automobile propulsion shaft 1 is shortened is stabilized. In addition, the positioning can be facilitated, and even if the outer elastic body 11 includes the contact portion 16, there is no work required for the assembly, so that the workability of the assembly is good.
When the inner tube 9 is disposed in front of the outer tube 8, it extends radially inward from the rear end portion of the outer elastic body 11 and the end surface of the inner elastic body 12 and the inner tube 9. You may provide the contact part 16 contact | abutted to an end surface.

１ 自動車用推進軸
３ 第一推進軸
４ 第二推進軸
８ 外管
９ 内管
１０ 弾性体
１１ 外側弾性体
１２ 内側弾性体
１３ 第１突出部
１４ 第２突出部
１５、１６ 当接部 DESCRIPTION OF SYMBOLS 1 Automotive propulsion shaft 3 First propulsion shaft 4 Second propulsion shaft 8 Outer tube 9 Inner tube 10 Elastic body 11 Outer elastic body 12 Inner elastic body 13 First projecting portion 14 Second projecting portion 15, 16 Contact portion

Claims (2)

外管と、一端が前記外管の内側に収容される内管と、前記外管と内管との間に介在する弾性体とを備え、衝突により短縮する自動車用推進軸であって、
前記弾性体は、
前記外管の内周面に固着される環状の外側弾性体と、
前記内管の外周面に固着されるとともに、前記外側弾性体内に嵌合される環状の内側弾性体と、
を有し、
前記外側弾性体の内周面には、径方向内側に突出する複数の第１突出部が形成され、
前記内側弾性体の外周面には、径方向外側に突出する複数の第２突出部が形成され、
前記嵌合により、前記第１突出部と前記第２突出部とが周方向に交互に並ぶとともに、前記第１突出部と前記第２突出部とが径方向又は／及び周方向に押し潰された状態となっており、
前記内側弾性体の端部に、径方向外側に延在して前記外側弾性体の端面及び前記外管の
端面に当接する当接部が設けられていることを特徴とする自動車用推進軸。 An automobile propulsion shaft comprising an outer tube, an inner tube having one end accommodated inside the outer tube, and an elastic body interposed between the outer tube and the inner tube, and shortened by a collision,
The elastic body is
An annular outer elastic body fixed to the inner peripheral surface of the outer tube;
An annular inner elastic body fixed to the outer peripheral surface of the inner tube and fitted into the outer elastic body;
Have
A plurality of first protrusions protruding radially inward are formed on the inner peripheral surface of the outer elastic body,
A plurality of second projecting portions projecting radially outward are formed on the outer peripheral surface of the inner elastic body,
By the fitting, the first protrusions and the second protrusions are alternately arranged in the circumferential direction, and the first protrusions and the second protrusions are crushed in the radial direction and / or the circumferential direction. and it has become a state,
Extending radially outward from the end of the inner elastic body, the end surface of the outer elastic body and the outer tube
A propulsion shaft for an automobile, characterized in that a contact portion that contacts the end surface is provided . 外管と、一端が前記外管の内側に収容される内管と、前記外管と内管との間に介在する弾性体とを備え、衝突により短縮する自動車用推進軸であって、
前記弾性体は、
前記外管の内周面に固着される環状の外側弾性体と、
前記内管の外周面に固着されるとともに、前記外側弾性体内に嵌合される環状の内側弾性体と、
を有し、
前記外側弾性体の内周面には、径方向内側に突出する複数の第１突出部が形成され、
前記内側弾性体の外周面には、径方向外側に突出する複数の第２突出部が形成され、
前記嵌合により、前記第１突出部と前記第２突出部とが周方向に交互に並ぶとともに、前記第１突出部と前記第２突出部とが径方向又は／及び周方向に押し潰された状態となっており、
前記外側弾性体の端部に、径方向内側に延在して前記内側弾性体の端面及び前記内管の
端面に当接する当接部が設けられていることを特徴とする自動車用推進軸。 An automobile propulsion shaft comprising an outer tube, an inner tube having one end accommodated inside the outer tube, and an elastic body interposed between the outer tube and the inner tube, and shortened by a collision,
The elastic body is
An annular outer elastic body fixed to the inner peripheral surface of the outer tube;
An annular inner elastic body fixed to the outer peripheral surface of the inner tube and fitted into the outer elastic body;
Have
A plurality of first protrusions protruding radially inward are formed on the inner peripheral surface of the outer elastic body,
A plurality of second projecting portions projecting radially outward are formed on the outer peripheral surface of the inner elastic body,
By the fitting, the first protrusions and the second protrusions are alternately arranged in the circumferential direction, and the first protrusions and the second protrusions are crushed in the radial direction and / or the circumferential direction. and it has become a state,
At the end of the outer elastic body, it extends radially inward and the end surface of the inner elastic body and the inner tube
A propulsion shaft for an automobile, characterized in that a contact portion that contacts the end surface is provided .
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JP2006132628A (en) * 2004-11-04 2006-05-25 Jidosha Buhin Kogyo Co Ltd Propeller shaft
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