JP2012051520A - Free wheel hub - Google Patents

Free wheel hub Download PDF

Info

Publication number
JP2012051520A
JP2012051520A JP2010197366A JP2010197366A JP2012051520A JP 2012051520 A JP2012051520 A JP 2012051520A JP 2010197366 A JP2010197366 A JP 2010197366A JP 2010197366 A JP2010197366 A JP 2010197366A JP 2012051520 A JP2012051520 A JP 2012051520A
Authority
JP
Japan
Prior art keywords
gear
hub
outer gear
wheel
negative pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2010197366A
Other languages
Japanese (ja)
Inventor
Koji Sato
光司 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Priority to JP2010197366A priority Critical patent/JP2012051520A/en
Publication of JP2012051520A publication Critical patent/JP2012051520A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a free wheel hub having a small number of parts and facilitating assembling.SOLUTION: An outer gear 7 is fixed in a hub housing 6. The wheel hub 2 is locked on a front side axle 1 by meshing with the outer gear 7. An inner peripheral part of a diaphragm 14 for partitioning the inside of the hub housing 6 into a two-wheel driving side negative pressure chamber 31 and a four-wheel driving side negative pressure chamber 32 is connected to an outer side end part of a slide gear 10 making the wheel hub 2 free by releasing the meshing. The outer gear 7 is formed into a cylindrical shape, and a cylinder part 13 formed on an outer periphery of a spring retainer 12 is forcibly fitted to an outer diameter surface at the outer side end part of the cylindrical outer gear 7. An outer peripheral part of the diaphragm 14 is held from both sides by the spring retainer 12 and the outer side end face of the cylindrical outer gear 7 to reduce the number of parts.

Description

この発明は、4輪駆動車のフリーホイールハブに関する。   The present invention relates to a freewheel hub for a four-wheel drive vehicle.

FRベースの4輪駆動車においては、エンジンおよびトランスミッションからの動力を前側プロペラシャフトと後側プロペラシャフトに分配するトランスファを有し、そのトランスファによって2輪駆動(2WD)と4輪駆動(4WD)とに切換えるようにしている。   The FR-based four-wheel drive vehicle has a transfer that distributes power from the engine and the transmission to the front propeller shaft and the rear propeller shaft, and by the transfer, two-wheel drive (2WD) and four-wheel drive (4WD) To switch to.

ここで、2輪駆動による走行時に、従動側車輪と従動側車軸とが一体に回転すると、従動側車輪から従動側車軸が回転されるため、走行抵抗が増大してエネルギが無駄に消費されることになる。   Here, when the driven wheel and the driven axle are rotated together during traveling by the two-wheel drive, the driven axle is rotated from the driven wheel, so that the running resistance is increased and energy is wasted. It will be.

そのような不都合を解消するため、特許文献1に記載された4輪駆動車においては、従動側車輪と従動側車軸との間にフリーホイールハブを設け、トランスファの2輪駆動への切換えにおいて、従動側車輪を従動側車軸から切り離し、従動側車輪をフリー状態として無駄な走行抵抗の低減を図り、一方、トランスファの4輪駆動への切換えにおいては、従動側車輪と従動側車軸とをロック状態にして、エンジンからの動力が従動側車輪に伝達されるようにしている。   In order to eliminate such inconvenience, in the four-wheel drive vehicle described in Patent Document 1, a free wheel hub is provided between the driven wheel and the driven axle, and the transfer is switched to the two-wheel drive. The driven wheel is disconnected from the driven axle and the driven wheel is set free to reduce wasteful running resistance. On the other hand, when the transfer is switched to four-wheel drive, the driven wheel and the driven axle are locked. Thus, the power from the engine is transmitted to the driven wheel.

ここで、上記特許文献1に記載されたフリーホイールハブにおいては、従動側車軸と同軸上に従動側車輪のホイールハブを回転可能に設け、そのホイールハブのアウタ側端面に連結されたハブハウジングの内部にダイヤフラムを組込んで2輪駆動側負圧室と4輪駆動側負圧室とを形成し、上記2輪駆動側負圧室の減圧によりダイヤフラムを2輪駆動側負圧室に向けて変形させ、そのダイヤフラムに連結されたスライドギヤを従動側車軸上でスライドさせて、そのスライドギヤとハブハウジングの内部に固定されたアウタギヤの噛合を解除し、従動側車軸に対してホイールハブをフリー状態としている。   Here, in the free wheel hub described in Patent Document 1, the wheel hub of the driven wheel is provided rotatably on the same axis as the driven axle, and the hub housing connected to the outer side end surface of the wheel hub is provided. A two-wheel drive side negative pressure chamber and a four-wheel drive side negative pressure chamber are formed by incorporating a diaphragm inside, and the diaphragm is directed toward the two-wheel drive side negative pressure chamber by the pressure reduction of the two-wheel drive side negative pressure chamber. The slide gear connected to the diaphragm is slid on the driven side axle to release the engagement between the slide gear and the outer gear fixed inside the hub housing, and the wheel hub is free from the driven side axle. State.

また、上記4輪駆動側負圧室の減圧によりダイヤフラムを4輪駆動側負圧室に向けて変形させ、スライドギヤをアウタギヤに向けて移動させて、そのスライドギヤとアウタギヤの噛合によりホイールハブを従動側車軸に対してロック状態としている。   Further, the diaphragm is deformed toward the four-wheel drive side negative pressure chamber by depressurization of the four-wheel drive side negative pressure chamber, the slide gear is moved toward the outer gear, and the wheel hub is engaged by the engagement of the slide gear and the outer gear. The driven axle is locked.

特開平10−278621号公報Japanese Patent Laid-Open No. 10-278621

ところで、上記特許文献1に記載されたフリーホイールハブにおいては、図4に示すように、ハブハウジング40の内部を2輪駆動側負圧室41と4輪駆動側負圧室42とに仕切るダイヤフラム43の外周部をスリーブ44と、そのスリーブ44の外径面端部に圧入嵌合される円筒部45aを外周に有するスプリングリテナ45によって両側から挟持し、上記スリーブ44とアウタギヤ46の対向面間にシールリング47を組込んで2輪駆動側負圧室41と4輪駆動側負圧室42の相互間での圧力の漏れを防止するようにしているため、部品点数が多く、組立に非常に手間がかかるという問題があった。   Incidentally, in the free wheel hub described in Patent Document 1, as shown in FIG. 4, a diaphragm that partitions the inside of the hub housing 40 into a two-wheel drive side negative pressure chamber 41 and a four-wheel drive side negative pressure chamber 42. The outer periphery of 43 is sandwiched from both sides by a sleeve 44 and a spring retainer 45 having a cylindrical portion 45a that is press-fitted and fitted to the end of the outer diameter surface of the sleeve 44, and between the opposing surfaces of the sleeve 44 and the outer gear 46 Since the seal ring 47 is incorporated into the two-wheel drive-side negative pressure chamber 41 and the four-wheel drive-side negative pressure chamber 42 to prevent pressure leakage between the two-wheel drive-side negative pressure chamber 42, the number of parts is large, and assembly is extremely difficult. There was a problem that it took time and effort.

また、スリーブ44がアルミニウム製とされ、スプリングリテナ45が鉄製とされて線膨張係数が大きく異なるため、温度降下時の収縮量の相違により、スリーブ44とスプリングリテナ45の円筒状周壁45aの圧入による嵌合面間に隙間が生じ、2輪駆動側負圧室41と4輪駆動側負圧室42の相互間での圧力漏れを防止することができないという問題があった。   Further, since the sleeve 44 is made of aluminum and the spring retainer 45 is made of iron and the linear expansion coefficient is greatly different, the sleeve 44 and the cylindrical peripheral wall 45a of the spring retainer 45 are press-fitted due to the difference in shrinkage when the temperature drops. There is a problem in that a gap is generated between the fitting surfaces, and a pressure leak between the two-wheel drive side negative pressure chamber 41 and the four-wheel drive side negative pressure chamber 42 cannot be prevented.

この発明の課題は、2輪駆動側負圧室と4輪駆動側負圧室の相互間での圧力漏れを完全に防止することができるようにした部品点数の少ない組立ての容易なフリーホイールハブを提供することである。   SUMMARY OF THE INVENTION An object of the present invention is to provide a free wheel hub that can be easily assembled with a reduced number of parts and that can completely prevent pressure leakage between the two-wheel drive side negative pressure chamber and the four-wheel drive side negative pressure chamber. Is to provide.

上記の課題を解決するため、この発明においては、従動側車軸と同軸上に従動側車輪のホイールハブを回転可能に設け、そのホイールハブのアウタ側端面に連結されたハブハウジングの内部に、そのハブハウジングと一体に回転するアウタギヤを設け、前記ハブハウジングの内部に位置する従動側車軸の端部にスライドギヤをスライド自在に嵌合し、かつ、回り止めし、そのスライドギヤのアウタ側端部に内周部が連結されたダイヤフラムによりハブハウジングの内部を軸方向に仕切って2輪駆動側負圧室と4輪駆動側負圧室を設け、前記2輪駆動側負圧室の減圧によりスライドギヤをアウタギヤとの噛合が解除する位置まで移動させてホイールハブをフリー状態とし、前記4輪駆動側負圧室の減圧によりスライドギヤをアウタギヤに噛合する位置まで移動させてホイールハブを従動側車軸に対してロック状態とするフリーホイールハブにおいて、前記アウタギヤが、インナ側端部の内周に環状突出部を有し、その環状突出部の内周に前記スライドギヤの外周に形成された歯部が噛合可能な歯部が形成された円筒状をなし、その円筒状アウタギヤのアウタ側端部の外径面にキャップ状のスプリングリテナの外周に形成された円筒部を圧入して、そのスプリングリテナと円筒状アウタギヤのアウタ側端面とで前記ダイヤフラムの外周部を両側から挟持した構成を採用したのである。   In order to solve the above problems, in the present invention, a wheel hub of a driven wheel is provided rotatably on the same axis as the driven axle, and the hub hub connected to the outer side end surface of the wheel hub is provided in the hub housing. An outer gear that rotates integrally with the hub housing is provided, and a slide gear is slidably fitted to the end of a driven axle located inside the hub housing, and the outer end of the slide gear is prevented from rotating. A two-wheel drive-side negative pressure chamber and a four-wheel drive-side negative pressure chamber are provided by partitioning the inside of the hub housing in the axial direction by a diaphragm having an inner periphery connected to the inner periphery of the hub housing. The gear is moved to a position where the meshing with the outer gear is released to set the wheel hub in a free state, and the slide gear is meshed with the outer gear by reducing the pressure in the negative pressure chamber on the four-wheel drive side. In the free wheel hub in which the wheel hub is locked with respect to the driven-side axle by moving to the position, the outer gear has an annular protrusion on the inner periphery of the inner side end, and the inner periphery of the annular protrusion. A cylindrical portion is formed with a tooth portion that can mesh with the tooth portion formed on the outer periphery of the slide gear, and is formed on the outer diameter surface of the outer side end portion of the cylindrical outer gear on the outer periphery of the cap-shaped spring retainer. The cylindrical portion is press-fitted, and the outer peripheral portion of the diaphragm is sandwiched from both sides by the spring retainer and the outer side end surface of the cylindrical outer gear.

上記のように、アウタギヤを円筒状とし、そのアウタギヤのアウタ側端部の外径面にスプリングリテナの外周に形成された円筒部を圧入して、ダイヤフラムの外周部をスプリングリテナと円筒状アウタギヤのアウタ側端面とで両側から挟持することにより、図4に示す従来のフリーホイールハブのスリーブ44およびシールリング47を不要とすることができ、部品点数の低減化を図ることができる。   As described above, the outer gear is formed into a cylindrical shape, and the cylindrical portion formed on the outer periphery of the spring retainer is press-fitted into the outer diameter surface of the outer side end portion of the outer gear, and the outer peripheral portion of the diaphragm is inserted between the spring retainer and the cylindrical outer gear. By sandwiching the outer side end surface from both sides, the sleeve 44 and the seal ring 47 of the conventional freewheel hub shown in FIG. 4 can be eliminated, and the number of parts can be reduced.

ここで、アウタギヤとスプリングリテナのそれぞれを線膨張係数が同一またはほぼ同一とする金属材料により形成することにより、温度降下時の収縮量をほぼ同じとすることができる。その結果、アウタギヤとスプリングリテナの円筒部の圧入嵌合部間に隙間が形成されるという不都合の発生がなく、4輪駆動側負圧室と2輪駆動側負圧室の相互間での圧力漏れを防止することができ、フリーホイールハブを確実に機能させることができる。   Here, by forming each of the outer gear and the spring retainer with a metal material having the same or substantially the same linear expansion coefficient, the amount of contraction when the temperature drops can be made substantially the same. As a result, there is no inconvenience that a gap is formed between the press-fitting portion of the cylindrical portion of the outer gear and the spring retainer, and the pressure between the four-wheel drive side negative pressure chamber and the two-wheel drive side negative pressure chamber is reduced. Leakage can be prevented and the freewheel hub can function reliably.

また、アウタギヤの少なくとも歯部を焼入れすると、硬度を高めることができるため、ギヤ部の摩耗を防止し、耐久性の向上を図ることができる。   Further, when at least the tooth portion of the outer gear is quenched, the hardness can be increased, so that wear of the gear portion can be prevented and durability can be improved.

この場合、アウタギヤを浸炭鋼の冷間鍛造品とし、そのアウタギヤを浸炭焼入れして歯部の硬度を高めるようにしてもよく、あるいは、アウタギヤを高炭素鋼の冷間鍛造品とし、そのアウタギヤの少なくとも歯部を高周波焼入れして硬度を高めるようにしてもよい。   In this case, the outer gear may be a cold forged product of carburized steel and the outer gear may be carburized and hardened to increase the hardness of the teeth, or the outer gear may be a cold forged product of high carbon steel and the outer gear At least the teeth may be induction hardened to increase the hardness.

さらに、ダイヤフラムの内周部を金属板のプレス成形品からなる一対の互いに結合された補強部材で両側から挟持し、その内側補強部材をキャップ状として外周に前記スライドギヤのアウタ側端部の外周に嵌合される円筒部を設け、その円筒部の端縁を内側に折り返して内筒部を形成し、その内筒部の端縁に内向きに傾斜する複数の弾性片を設け、スライドギヤの外径面には、上記弾性片が係合可能な環状溝を形成すると、スライドギヤのアウタ側端部の外周に対する内筒部の嵌合時に、弾性片がスライドギヤのアウタ側端面の外周部に対する当接により径方向外方に向けて弾性変形し、その弾性片が環状溝と対向する位置まで内筒部を嵌合すると、弾性片は自己の復元弾性により傾斜状に復元して環状溝に係合するため、ダイヤフラムの内周部をスライドギヤに簡単に確実に連結することができる。   Further, the inner peripheral portion of the diaphragm is sandwiched from both sides by a pair of mutually connected reinforcing members made of a press-formed product of a metal plate, and the inner reinforcing member is formed into a cap shape on the outer periphery of the outer side end portion of the slide gear. A cylindrical portion that is fitted to the inner cylindrical portion, the inner cylindrical portion is formed by folding the end of the cylindrical portion inward, and a plurality of elastic pieces that are inclined inward are provided at the end of the inner cylindrical portion. When an annular groove that can engage the elastic piece is formed on the outer diameter surface of the slide gear, when the inner cylinder portion is fitted to the outer periphery of the outer side end portion of the slide gear, the elastic piece becomes the outer periphery of the outer side end surface of the slide gear. When the inner cylinder part is fitted to the position where the elastic piece is opposed to the annular groove, the elastic piece is restored to an inclined shape by its own restoring elasticity, and is annularly deformed. Inside the diaphragm to engage the groove Part can be easily and reliably connected to the slide gear to.

上記のように、この発明に係るフリーホイールハブにおいては、アウタギヤを円筒状とし、そのアウタギヤのアウタ側端部の外径面にスプリングリテナの外周に形成された円筒部を圧入して、ダイヤフラムの外周部をスプリングリテナと円筒状アウタギヤのアウタ側端面とで両側から挟持したことにより、従来のフリーホイールハブに対比して部品点数を少なくすることができため、コストの低減と組立ての容易化を図ることができる。   As described above, in the freewheel hub according to the present invention, the outer gear is formed into a cylindrical shape, and the cylindrical portion formed on the outer periphery of the spring retainer is press-fitted into the outer diameter surface of the outer side end portion of the outer gear, so that the diaphragm Since the outer periphery is clamped from both sides by the spring retainer and the outer end face of the cylindrical outer gear, the number of parts can be reduced compared to the conventional freewheel hub, thus reducing costs and facilitating assembly. Can be planned.

この発明に係るフリーホイールハブの実施の形態を示す縦断面図A longitudinal sectional view showing an embodiment of a freewheel hub according to the present invention 内側補強部材の一部切欠斜視図Partially cutaway perspective view of inner reinforcement member ホイールハブのロック状態を示す断面図Sectional view showing the locked state of the wheel hub 従来のフリーホイールハブを示す縦断面図Longitudinal sectional view showing a conventional freewheel hub

以下、この発明の実施の形態を図面に基いて説明する。図1に示すように、従動側車軸としての前側車軸1とその外側に設けられた前輪(従動側車輪)のホイールハブ2は同軸上の配置とされている。   Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a front axle 1 as a driven axle and a wheel hub 2 of a front wheel (driven wheel) provided on the outside thereof are arranged coaxially.

前側車軸1とホイールハブ2との間には筒状のスピンドル3が組み込まれ、そのスピンドル3とホイールハブ2は軸受4によって相対的に回転自在に支持されている。   A cylindrical spindle 3 is incorporated between the front axle 1 and the wheel hub 2, and the spindle 3 and the wheel hub 2 are relatively rotatably supported by a bearing 4.

ホイールハブ2のアウタ側端面にはボルト5の締め付けによってハブハウジング6が連結されている。ハブハウジング6の内部にはアウタギヤ7が組込まれている。アウタギヤ7は円筒状をなし、そのインナ側端部の内周には環状突出部8が形成され、その環状突出部8の内周に歯部としてのスプライン歯9が形成されている。アウタギヤ7はスプラインによる嵌合等によりハブハウジング6の内径面に固定されてハブハウジング6と一体に回転するようになっている。   A hub housing 6 is coupled to the outer end surface of the wheel hub 2 by tightening bolts 5. An outer gear 7 is incorporated in the hub housing 6. The outer gear 7 has a cylindrical shape, and an annular protrusion 8 is formed on the inner periphery of the inner side end portion, and spline teeth 9 as tooth portions are formed on the inner periphery of the annular protrusion 8. The outer gear 7 is fixed to the inner surface of the hub housing 6 by spline fitting or the like, and rotates integrally with the hub housing 6.

前側車軸1のハブハウジング6の内部に位置する端部にはスライドギヤ10が嵌合されている。スライドギヤ10はスプラインあるいはセレーションの嵌合によって前側車軸1に回り止めされ、かつ、軸方向に移動自在とされ、その外径面には上記アウタギヤ7のスプライン歯9と噛合可能な歯部としてのスプライン歯11が設けられている。   A slide gear 10 is fitted to an end portion of the front axle 1 located inside the hub housing 6. The slide gear 10 is prevented from rotating on the front axle 1 by fitting of a spline or serration, and is movable in the axial direction. The outer diameter surface of the slide gear 10 is a tooth portion that can mesh with the spline teeth 9 of the outer gear 7. Spline teeth 11 are provided.

アウタギヤ7のアウタ側端部の外径面にはキャップ状スプリングリテナ12の外周に形成された円筒部13が圧入嵌合され、そのスプリングリテナ12とアウタギヤ7のアウタ側端面とでダイヤフラム14の外周部が両側から挟持されている。   A cylindrical portion 13 formed on the outer periphery of the cap-shaped spring retainer 12 is press-fitted to the outer diameter surface of the outer side end portion of the outer gear 7, and the outer periphery of the diaphragm 14 is formed by the spring retainer 12 and the outer side end surface of the outer gear 7. The part is clamped from both sides.

ダイヤフラム14の内周部は、金属板のプレス成形品からなる2枚の互いに結合された補強部材15、16により両側から挟持されて補強され、その内側補強部材15がスライドギヤ10に連結されている。その連結に際し、ここでは、図1および図2に示すように、内側補強部材15をキャップ状とし、その外周に形成された円筒部15aを内側に折り返して内筒部15bを設け、その内筒部15bの端縁に形成された内向きの複数の弾性片18をスライドギヤ10のアウタ側端部の外径面に形成された環状溝19に係合している。   The inner peripheral portion of the diaphragm 14 is reinforced by being sandwiched from both sides by two reinforcing members 15 and 16 made of a metal plate press-molded product, and the inner reinforcing member 15 is connected to the slide gear 10. Yes. In this connection, as shown in FIGS. 1 and 2, the inner reinforcing member 15 has a cap shape, and a cylindrical portion 15a formed on the outer periphery thereof is folded inward to provide an inner cylindrical portion 15b. A plurality of inward elastic pieces 18 formed on the edge of the portion 15 b are engaged with an annular groove 19 formed on the outer diameter surface of the outer side end portion of the slide gear 10.

ここで、複数の弾性片18のそれぞれは、ダイヤフラム14に向けて傾きをもつ傾斜状とされており、スライドギヤ10に対する内筒部15bの嵌合時、そのスライドギヤ10のアウタ側端面の外周部に対する当接によって弾性片18が径方向外方に向けて弾性変形し、その弾性片18が環状溝19と対向する位置まで内筒部15bが嵌合されると、弾性片18が自己の復元弾性により傾斜状に復元して環状溝19に係合するようになっている。   Here, each of the plurality of elastic pieces 18 is inclined toward the diaphragm 14, and when the inner cylinder portion 15 b is fitted to the slide gear 10, the outer periphery of the outer side end surface of the slide gear 10 When the elastic piece 18 is elastically deformed radially outward by the contact with the portion and the inner cylindrical portion 15b is fitted to the position where the elastic piece 18 faces the annular groove 19, the elastic piece 18 It is restored to an inclined shape by restoring elasticity and engaged with the annular groove 19.

ハブハウジング6の内部に対するダイヤフラム14の組込みによって、そのハブハウジング6の内部に2輪駆動側負圧室31と4輪駆動側負圧室32とが形成され、上記2輪駆動側負圧室31を減圧することにより、スライドギヤ10がアウタギヤ7の環状突出部8から離反する方向に移動して、スライドギヤ10のスプライン歯11とアウタギヤ7のスプライン歯9の噛合が解除するようになっている。   By incorporating the diaphragm 14 into the hub housing 6, a two-wheel drive side negative pressure chamber 31 and a four-wheel drive side negative pressure chamber 32 are formed in the hub housing 6. By reducing the pressure, the slide gear 10 moves away from the annular protrusion 8 of the outer gear 7, and the engagement between the spline teeth 11 of the slide gear 10 and the spline teeth 9 of the outer gear 7 is released. .

また、4輪駆動側負圧室32を減圧することにより、スライドギヤ10がアウタギヤ7の環状突出部8に向けて移動して、スライドギヤ10のスプライン歯11がアウタギヤ7のスプライン歯9に噛合するようになっている。   Further, by reducing the four-wheel drive side negative pressure chamber 32, the slide gear 10 moves toward the annular protrusion 8 of the outer gear 7, and the spline teeth 11 of the slide gear 10 mesh with the spline teeth 9 of the outer gear 7. It is supposed to be.

なお、図1に示す20は、スライドギヤ10をアウタギヤ7の環状突出部8に向けて付勢するスプリングを示す。また、21は、2輪駆動側負圧室31に連通する吸引路33と4輪駆動側負圧室32に連通する吸引路34間をシールするシール部材を示す。   1 denotes a spring that urges the slide gear 10 toward the annular protrusion 8 of the outer gear 7. Reference numeral 21 denotes a seal member that seals between the suction passage 33 communicating with the two-wheel drive side negative pressure chamber 31 and the suction passage 34 communicating with the four-wheel drive side negative pressure chamber 32.

実施の形態で示すフリーホイールハブは上記の構造からなり、2輪駆動による走行に際しては、2輪駆動側負圧室31を減圧する。その減圧によりダイヤフラム14が2輪駆動側負圧室31に向けて変形し、そのダイヤフラム14に連結されたスライドギヤ10がアウタギヤ7の環状突出部8から離反する方向に移動して、図1に示すように、スライドギヤ10のスプライン歯11とアウタギヤ7のスプライン歯9との噛合が解除され、ホイールハブ2は前側車軸1に対し切り離されてフリー状態となり、ホイールハブ2から前側車軸1への回転伝達が遮断される状態になる。   The freewheel hub shown in the embodiment has the above-described structure, and the two-wheel drive-side negative pressure chamber 31 is decompressed when traveling by two-wheel drive. Due to the pressure reduction, the diaphragm 14 is deformed toward the two-wheel drive-side negative pressure chamber 31, and the slide gear 10 connected to the diaphragm 14 moves in a direction away from the annular protrusion 8 of the outer gear 7. As shown, the engagement between the spline teeth 11 of the slide gear 10 and the spline teeth 9 of the outer gear 7 is released, and the wheel hub 2 is disconnected from the front axle 1 to become free, and the wheel hub 2 is moved to the front axle 1. The rotation transmission is cut off.

一方、4輪駆動による走行に際しては、4輪駆動側負圧室32を減圧する。その減圧によりダイヤフラム14が4輪駆動側負圧室32に向けて変形し、スライドギヤ10がアウタギヤ7の環状突出部8に向けて移動して、図3に示すように、スライドギヤ10のスプライン歯11がアウタギヤ7のスプライン歯9に噛合し、ホイールハブ2は前側車軸1に対して結合されたロック状態となり、上記前側車軸1からホイールハブ2に回転が伝達される状態となる。   On the other hand, when traveling by four-wheel drive, the four-wheel drive negative pressure chamber 32 is decompressed. Due to the pressure reduction, the diaphragm 14 is deformed toward the negative pressure chamber 32 on the four-wheel drive side, and the slide gear 10 moves toward the annular projecting portion 8 of the outer gear 7, and as shown in FIG. The teeth 11 mesh with the spline teeth 9 of the outer gear 7, and the wheel hub 2 enters a locked state where it is coupled to the front axle 1, and rotation is transmitted from the front axle 1 to the wheel hub 2.

実施の形態に示すフリーホイールハブにおいては、アウタギヤ7を円筒状とし、そのアウタギヤ7のアウタ側端部の外径面にスプリングリテナ12の外周に形成された円筒部13を圧入して、ダイヤフラム14の外周部をスプリングリテナ12と円筒状アウタギヤ7のアウタ側端面とで両側から挟持しているため、図4に示す従来のフリーホイールハブのスリーブ44およびシールリング47を不要とすることができる。   In the freewheel hub shown in the embodiment, the outer gear 7 is formed into a cylindrical shape, and the cylindrical portion 13 formed on the outer periphery of the spring retainer 12 is press-fitted into the outer diameter surface of the outer side end portion of the outer gear 7, so that the diaphragm 14 4 is sandwiched from both sides by the spring retainer 12 and the outer side end face of the cylindrical outer gear 7, the sleeve 44 and the seal ring 47 of the conventional freewheel hub shown in FIG. 4 can be dispensed with.

このため、図4に示すフリーホイールハブに比較して部品点数が少なく、組立ての容易化とコストの低減を図ることができる。   For this reason, compared with the freewheel hub shown in FIG. 4, the number of parts is small, and the assembly can be facilitated and the cost can be reduced.

実施の形態では、アウタギヤ7とスプリングリテナ12のそれぞれを鉄等の同一の金属材料で形成し、そのアウタギヤ7のスプライン歯9を焼入れ処理している。   In the embodiment, each of the outer gear 7 and the spring retainer 12 is formed of the same metal material such as iron, and the spline teeth 9 of the outer gear 7 are quenched.

上記のように、アウタギヤ7とスプリングリテナ12のそれぞれを同一の金属材料で形成することにより、アウタギヤ7とスプリングリテナ12のそれぞれの温度降下時の熱収縮量を同一とすることができるため、アウタギヤ7とスプリングリテナ12の円筒部13の圧入嵌合部間に隙間が形成されるという不都合の発生がなく、2輪駆動側負圧室31と4輪駆動側負圧室32の相互間での圧力漏れを防止することができ、フリーホイールハブを確実に機能させることができる。   As described above, since the outer gear 7 and the spring retainer 12 are formed of the same metal material, the amount of thermal contraction at the time of temperature drop of the outer gear 7 and the spring retainer 12 can be made the same. 7 and the press-fitting portion of the cylindrical portion 13 of the spring retainer 12 is not disadvantageously generated, and there is no inconvenience between the two-wheel drive side negative pressure chamber 31 and the four-wheel drive side negative pressure chamber 32. A pressure leak can be prevented and the freewheel hub can function reliably.

また、アウタギヤ7の少なくともスプライン歯9を焼入れ処理すると、硬度を高めることができるため、スプライン歯9を摩耗を防止し、耐久性の向上を図ることができる。   Further, if at least the spline teeth 9 of the outer gear 7 are quenched, the hardness can be increased, so that the spline teeth 9 can be prevented from being worn and the durability can be improved.

ここで、焼入れには、アウタギヤ7をクロムモリブデン(SCM)等の浸炭鋼の冷間鍛造品とし、そのアウタギヤ7を浸炭焼入れする方法やアウタギヤ7をS45C以上の高炭素鋼の冷間鍛造品とし、そのアウタギヤ7の少なくともスプライン歯9を高周波焼入れする方法を採用することができる。   Here, for quenching, the outer gear 7 is a cold forged product of carburized steel such as chromium molybdenum (SCM), and the outer gear 7 is carburized and quenched, or the outer gear 7 is a cold forged product of S45C or higher high carbon steel. A method of induction hardening at least the spline teeth 9 of the outer gear 7 can be employed.

なお、実施の形態では、アウタギヤ7とスプリングリテナ12のそれぞれを同一の金属材料で形成しているが、アウタギヤ7とスプリングリテナ12のそれぞれを線膨張係数がほぼ同じの異種の金属材料により形成してもよい。   In the embodiment, each of the outer gear 7 and the spring retainer 12 is formed of the same metal material. However, each of the outer gear 7 and the spring retainer 12 is formed of different metal materials having substantially the same linear expansion coefficient. May be.

1 前側車軸(従動側車軸)
2 ホイールハブ
6 ハブハウジング
7 アウタギヤ
8 環状突出部
9 スプライン歯(歯部)
10 スライドギヤ
11 スプライン歯(歯部)
12 スプリングリテナ
13 円筒部
14 ダイヤフラム
15 補強部材
15a 円筒部
15b 内筒部
16 補強部材
18 弾性片
19 環状溝
31 2輪駆動側負圧室
32 4輪駆動側負圧室
1 Front axle (driven axle)
2 Wheel hub 6 Hub housing 7 Outer gear 8 Annular protrusion 9 Spline tooth (tooth part)
10 Slide gear 11 Spline teeth (tooth part)
12 Spring retainer 13 Cylindrical portion 14 Diaphragm 15 Reinforcing member 15a Cylindrical portion 15b Inner cylindrical portion 16 Reinforcing member 18 Elastic piece 19 Annular groove 31 Two-wheel drive side negative pressure chamber 32 Four-wheel drive side negative pressure chamber

Claims (6)

従動側車軸と同軸上に従動側車輪のホイールハブを回転可能に設け、そのホイールハブのアウタ側端面に連結されたハブハウジングの内部に、そのハブハウジングと一体に回転するアウタギヤを設け、前記ハブハウジングの内部に位置する従動側車軸の端部にスライドギヤをスライド自在に嵌合し、かつ、回り止めし、そのスライドギヤのアウタ側端部に内周部が連結されたダイヤフラムによりハブハウジングの内部を軸方向に仕切って2輪駆動側負圧室と4輪駆動側負圧室を設け、前記2輪駆動側負圧室の減圧によりスライドギヤをアウタギヤとの噛合が解除する位置まで移動させてホイールハブをフリー状態とし、前記4輪駆動側負圧室の減圧によりスライドギヤをアウタギヤに噛合する位置まで移動させてホイールハブを従動側車軸に対してロック状態とするフリーホイールハブにおいて、
前記アウタギヤが、インナ側端部の内周に環状突出部を有し、その環状突出部の内周に前記スライドギヤの外周に形成された歯部が噛合可能な歯部が形成された円筒状をなし、その円筒状アウタギヤのアウタ側端部の外径面にキャップ状のスプリングリテナの外周に形成された円筒部を圧入して、そのスプリングリテナと円筒状アウタギヤのアウタ側端面とで前記ダイヤフラムの外周部を両側から挟持したことを特徴とするフリーホイールハブ。
A wheel hub of a driven wheel is coaxially provided with the driven axle, and an outer gear that rotates integrally with the hub housing is provided in a hub housing connected to an outer side end surface of the wheel hub. A slide gear is slidably fitted to the end of the driven axle located inside the housing and is prevented from rotating, and a diaphragm in which the inner peripheral portion is connected to the outer side end of the slide gear is used for the hub housing. A two-wheel drive side negative pressure chamber and a four-wheel drive side negative pressure chamber are provided by partitioning the inside in the axial direction, and the slide gear is moved to a position where the engagement with the outer gear is released by the pressure reduction of the two-wheel drive side negative pressure chamber. The wheel hub is brought into a free state, and the slide gear is moved to a position where it meshes with the outer gear by reducing the pressure in the negative pressure chamber on the four-wheel drive side, so that the wheel hub is moved to the driven axle. In the free wheel hub to a locked state and,
The outer gear has a cylindrical protrusion having an annular protrusion on the inner periphery of the inner side end, and a tooth portion that can mesh with the tooth formed on the outer periphery of the slide gear on the inner periphery of the annular protrusion. The cylindrical portion formed on the outer periphery of the cap-shaped spring retainer is press-fitted into the outer diameter surface of the outer end portion of the cylindrical outer gear, and the diaphragm is formed by the spring retainer and the outer end surface of the cylindrical outer gear. A freewheel hub characterized by sandwiching the outer periphery of both sides from both sides.
前記アウタギヤとスプリングリテナが、線膨張係数を同一またはほぼ同一とする金属材料により形成された請求項1に記載のフリーホイールハブ。   The freewheel hub according to claim 1, wherein the outer gear and the spring retainer are formed of a metal material having the same or substantially the same linear expansion coefficient. 前記アウタギヤの少なくとも歯部を焼入れ処理して硬度を高めた請求項1又は2に記載のフリーホイールハブ。   The freewheel hub according to claim 1 or 2, wherein at least a tooth portion of the outer gear is hardened to increase hardness. 前記アウタギヤが浸炭鋼の冷間鍛造品からなり、そのアウタギヤを浸炭焼入れして歯部の硬度を高めた請求項3に記載のフリーホイールハブ。   The freewheel hub according to claim 3, wherein the outer gear is made of a cold forged product of carburized steel, and the outer gear is carburized and hardened to increase the hardness of the tooth portion. 前記アウタギヤが高炭素鋼の冷間鍛造品からなり、そのアウタギヤの少なくとも歯部を高周波焼入れして硬度を高めた請求項3に記載のフリーホイールハブ。   The freewheel hub according to claim 3, wherein the outer gear is made of a cold forged product of high carbon steel, and at least a tooth portion of the outer gear is induction hardened to increase hardness. 前記ダイヤフラムの内周部を金属板のプレス成形品からなる一対の互いに結合された補強部材で両側から挟持し、その内側補強部材をキャップ状として外周に前記スライドギヤのアウタ側端部の外周に嵌合される円筒部を設け、その円筒部の端縁を内側に折り返して内筒部を形成し、その内筒部の端縁に内向きに傾斜する複数の弾性片を設け、この弾性片のそれぞれをスライドギヤの外径面に形成された環状溝に係合してダイヤフラムの内周部をスライドギヤに連結した請求項1乃至5のいずれかの項に記載のフリーホイールハブ。   The inner peripheral portion of the diaphragm is sandwiched from both sides by a pair of reinforcing members made of a metal plate press-molded product, and the inner reinforcing member is formed as a cap on the outer periphery and on the outer periphery of the outer side end of the slide gear. A cylindrical portion to be fitted is provided, an end of the cylindrical portion is folded inward to form an inner cylindrical portion, and a plurality of elastic pieces inclined inward are provided at the end of the inner cylindrical portion. The free wheel hub according to any one of claims 1 to 5, wherein each of these is engaged with an annular groove formed on an outer diameter surface of the slide gear, and the inner peripheral portion of the diaphragm is connected to the slide gear.
JP2010197366A 2010-09-03 2010-09-03 Free wheel hub Pending JP2012051520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2010197366A JP2012051520A (en) 2010-09-03 2010-09-03 Free wheel hub

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010197366A JP2012051520A (en) 2010-09-03 2010-09-03 Free wheel hub

Publications (1)

Publication Number Publication Date
JP2012051520A true JP2012051520A (en) 2012-03-15

Family

ID=45905373

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2010197366A Pending JP2012051520A (en) 2010-09-03 2010-09-03 Free wheel hub

Country Status (1)

Country Link
JP (1) JP2012051520A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108466525A (en) * 2018-03-15 2018-08-31 泉州臻美智能科技有限公司 A kind of anti-sideslip safety and stability formula automobile front drive axle driving mechanism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108466525A (en) * 2018-03-15 2018-08-31 泉州臻美智能科技有限公司 A kind of anti-sideslip safety and stability formula automobile front drive axle driving mechanism
CN108466525B (en) * 2018-03-15 2020-11-03 湖北和德工业科技有限公司 Sideslip-preventing safe and stable type automobile front drive axle driving mechanism

Similar Documents

Publication Publication Date Title
EP3176454B1 (en) Torque transmission joint and electric power steering device
US8814028B2 (en) Method of removing bulging portions to manufacture a friction welded propeller shaft
CN108350952B (en) Quick disconnect device of power transmission system
JP5594487B2 (en) Locking differential
US10183577B2 (en) Transfer case with four wheel lock
US10408271B2 (en) Torque transmission joint and worm reduction gear
EP3173646B1 (en) Torque-transmitting joint and electric power steering device
CN103291895B (en) The sealing device of the transmission case of engine
WO2007018485A1 (en) Dog-tooth-face interface
US20170234374A1 (en) Actuator mechanism for transfer case
WO2016047188A1 (en) Torque transmitting joint and electric power steering device
KR20140069451A (en) Coupling structure of propeller shaft in vehicle
JP2012051520A (en) Free wheel hub
US8123018B2 (en) Power transmitting device
JPS608568A (en) Viscous fluid coupling
JP2008196658A (en) Fitting structure, one-way clutch fixing structure, and friction engagement device
JP2012051521A (en) Free wheel hub
JP7366617B2 (en) Hub clutch device and its manufacturing method
JP5926575B2 (en) Seal body, apparatus and method
JP6539496B2 (en) Free wheel hub mechanism
US20200116251A1 (en) A bearing arrangement and an assembly comprising such bearing arrangement
JPH11334406A (en) Hub clutch device
JP2016155536A (en) Free wheel hub
JP7203564B2 (en) Ball bearings, clutch thrust bearing devices including such bearings, and driveline systems including such devices
JP6494398B2 (en) Freewheel hub