JPH0579068U - Driving force transmission device - Google Patents
Driving force transmission deviceInfo
- Publication number
- JPH0579068U JPH0579068U JP1594892U JP1594892U JPH0579068U JP H0579068 U JPH0579068 U JP H0579068U JP 1594892 U JP1594892 U JP 1594892U JP 1594892 U JP1594892 U JP 1594892U JP H0579068 U JPH0579068 U JP H0579068U
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- JP
- Japan
- Prior art keywords
- pressing force
- blade
- friction clutch
- rotating members
- transmission device
- 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.)
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Abstract
(57)【要約】
【目的】内外両回転部材のトルク伝達を行う摩擦クラッ
チと、同摩擦クラッチを差動回転に応じて押圧する押圧
力を作動ピストンを介して伝達する押圧力発生手段を備
えた駆動力伝達装置において、装置が異常の高温に達し
た場合には押圧力発生手段における押圧力の発生を規制
して、摩擦クラッチの焼損およびハンプ現象の発生を防
止する。
【構成】粘性流体の滞留室Ｒにおけるブレード１５のブ
レード部１５ｂの上流側と下流側とを、所定の高温時に
弁１８の作用により連通路ｐを開成して連通させ、押圧
力発生手段での押圧力の発生を規制する。
(57) [Abstract] [Purpose] Equipped with a friction clutch for transmitting torque between the inner and outer rotating members, and a pressing force generating means for transmitting a pressing force for pressing the friction clutch according to differential rotation through an operating piston. In the driving force transmission device, when the device reaches an abnormally high temperature, the generation of the pressing force in the pressing force generation means is regulated to prevent the friction clutch from being burned and the hump phenomenon. [Structure] An upstream side and a downstream side of a blade portion 15b of a blade 15 in a viscous fluid retention chamber R are opened by a function of a valve 18 to communicate with each other at a predetermined high temperature, and a pressing force generating means is provided. Restrict the generation of pressing force.
Description
【０００１】[0001]
本考案は、同軸的に支持された両回転部材間に介装されてこれら両回転部材間 のトルク伝達を行う駆動力伝達装置に関する。 The present invention relates to a driving force transmission device that is interposed between two rotary members that are coaxially supported to transmit torque between the both rotary members.
【０００２】[0002]
かかる駆動力伝達装置は、互いに同軸的に支持された両回転部材間に介装され てこれら両回転部材の相対回転時これら両回転部材を互いにトルク伝達可能に連 結するもので、従動側回転部材を駆動させる連結機構として使用されるものと、 これら両回転部材間の回転差を制限させる差動制限機構として使用されるもの等 に大別される。前者の連結機構は主としてリアルタイム式の四輪駆動車における 一方の動力伝達系路に介装され、また後者の差動制限機構は主として車両におけ る各ディファレンシャルに介装される。 Such a driving force transmitting device is interposed between both rotating members which are coaxially supported with each other, and when the both rotating members rotate relative to each other, these rotating members are connected to each other so that torque can be transmitted to each other. It is roughly classified into one used as a connecting mechanism for driving the members and one used as a differential limiting mechanism for limiting the rotation difference between the both rotating members. The former coupling mechanism is mainly installed in one power transmission path in a real-time four-wheel drive vehicle, and the latter differential limiting mechanism is mainly installed in each differential in the vehicle.
【０００３】 しかして、従来の駆動力伝達装置としては特開昭６３−２４０４２９号公報に 示されているように、同軸的かつ相対回転可能に位置する内外両回転部材間に配 設され、これら両回転部材の相対回転により作動して両回転部材をトルク伝達可 能に連結する摩擦係合力を発生させるとともに付与される軸方向の押圧力に応じ て前記摩擦係合力を増減させる摩擦クラッチ、および両回転部材の相対回転に応 じた軸方向の押圧力を発生させて同押圧力を前記摩擦クラッチに付与する押圧力 発生手段を備え、同押圧力発生手段を、前記両回転部材間に液密的に軸方向へ摺 動可能かつ外側回転部材に一体回転可能に組付けられて前記摩擦クラッチの一側 に対向する作動ピストンと、前記外側回転部材と前記作動ピストン間に形成され 軸方向に所定間隔を有して粘性流体が封入される流体室と、半径方向へ延びる１ または複数のブレード部を有し前記流体室にて前記内外両回転部材のいずれか一 方と一体回転可能に設けられ回転時前記流体室内に流体圧を発生させるブレード とにより構成してなる駆動力伝達装置がある。However, as disclosed in Japanese Patent Application Laid-Open No. 63-240429, a conventional driving force transmission device is arranged between both inner and outer rotating members that are coaxially and relatively rotatable. A friction clutch that operates by relative rotation of both rotating members to generate a frictional engaging force that connects the two rotating members so that torque can be transmitted, and that increases or decreases the frictional engaging force according to an axial pressing force applied, A pressing force generating means for generating an axial pressing force corresponding to the relative rotation of both rotating members and applying the pressing force to the friction clutch is provided, and the pressing force generating means is provided between the rotating members. An operating piston that is tightly slidable in the axial direction and is integrally rotatably mounted on the outer rotating member and faces one side of the friction clutch; and a shaft formed between the outer rotating member and the operating piston. A fluid chamber containing a viscous fluid at a predetermined interval in one direction and one or a plurality of blade portions extending in the radial direction and integrally rotatable with either one of the inner and outer rotating members in the fluid chamber. There is a driving force transmission device that is configured by a blade that is provided on the blade and that generates a fluid pressure in the fluid chamber during rotation.
【０００４】 この種形式の駆動力伝達装置においては、両回転部材間に相対回転が生じると 押圧力発生手段に差動回転数に応じた圧力が発生する。この圧力は摩擦クラッチ を押圧して同クラッチに両回転部材をトルク伝達可能に連結する摩擦係合力を発 生させる。かかる摩擦係合力は差動回転数に比例し、両回転部材間では差動回転 数に比例したトルクが一方から他方へ伝達される。 従って、当該駆動力伝達装 置は四輪駆動車の一方の動力伝達系路における駆動側回転部材と従動側回転部材 との連結機構として機能するとともに、駆動側および従動側回転部材間、両駆動 側回転部材間または両従動側回転部材間の差動制限機構としても機能する。In this type of driving force transmission device, when relative rotation occurs between both rotary members, pressure corresponding to the differential rotation speed is generated in the pressing force generation means. This pressure presses the friction clutch to generate a frictional engagement force that couples both rotary members to the same clutch so that torque can be transmitted. Such frictional engagement force is proportional to the differential rotation speed, and torque proportional to the differential rotation speed is transmitted between the two rotary members from one to the other. Therefore, the drive force transmission device functions as a connecting mechanism between the drive-side rotating member and the driven-side rotating member in one power transmission system path of the four-wheel drive vehicle, and also between the drive-side and driven-side rotating members. It also functions as a differential limiting mechanism between the side rotating members or between both driven side rotating members.
【０００５】[0005]
ところで、当該駆動力伝達装置においては作動時には摩擦クラッチが摩擦係合 して摩擦熱が発生するが、両回転部材が高差動状態で回転しかつこの状態が長く 続くと発生する摩擦熱のために摩擦クラッチが高温となる。摩擦クラッチは例え ば３００℃以上の異常高温に達すると焼損するおそれがあり、このような異常高 温になるのを防止しなければならない。このような異常高温の発生を防止するた めの手段を備えた駆動力伝達装置として、本出願人は実開平１−６５７７号公報 に示す駆動力伝達装置を提案している。当該駆動力伝達装置においては、摩擦ク ラッチに対して作動ピストンを離間させる方向に同作動ピストンを付勢する形状 記憶合金等の感温性のバネ部材を採用して、摩擦クラッチが高温に達するとバネ 部材の変形により作動ピストンを摩擦クラッチから離間させ、摩擦クラッチの摩 擦係合を解除させることにより摩擦クラッチのハンプ現象の発生および焼損の発 生を防止している。 本考案の目的は、摩擦クラッチが高温に達すると押圧力発 生手段での押圧力の発生を規制することにより作動ピストンの摩擦クラッチに対 する押圧を解除させ、摩擦クラッチのハンプ現象の発生および焼損の発生を防止 することにある。 In the drive force transmission device, the friction clutch frictionally engages during operation to generate frictional heat, but due to the frictional heat generated when both rotating members rotate in a high differential state and this state continues for a long time. The friction clutch becomes very hot. The friction clutch may burn out when it reaches an abnormally high temperature of, for example, 300 ° C or higher, and it is necessary to prevent such an abnormally high temperature. The present applicant has proposed a driving force transmission device disclosed in Japanese Utility Model Laid-Open No. 1-6577 as a driving force transmission device provided with a means for preventing the occurrence of such an abnormally high temperature. The drive force transmission device employs a temperature-sensitive spring member such as a shape memory alloy that biases the working piston in a direction to move it away from the friction clutch, and the friction clutch reaches a high temperature. Then, the deformation of the spring member causes the working piston to be separated from the friction clutch, and the friction engagement of the friction clutch is released to prevent the hump phenomenon of the friction clutch and the occurrence of burnout. An object of the present invention is to release the pressing force of the operating piston against the friction clutch when the friction clutch reaches a high temperature, thereby restricting the generation of the pressing force by the pressing force generating means, and to prevent the hump phenomenon of the friction clutch from occurring. It is to prevent the occurrence of burnout.
【０００６】[0006]
本考案は上記した形式の駆動力伝達装置において、前記ブレードと前記流体室 の内壁間に前記ブレード部の上流側と下流側とを連通する連通路を設けるととも に、同連通路に所定の高温に達したとき同連通路を開成する感温性の閉鎖手段を 設けたことを特徴とするものである。 According to the present invention, in the driving force transmission device of the above-mentioned type, a communication passage is provided between the blade and the inner wall of the fluid chamber for communicating the upstream side and the downstream side of the blade portion, and a predetermined passage is provided in the communication passage. It is characterized by providing a temperature-sensitive closing means for opening the communication passage when the temperature reaches a high temperature.
【０００７】[0007]
かかる構成の駆動力伝達装置においては、装置または粘性流体が所定の高温未 満の場合にはブレードに設けた連通路は閉鎖手段の作用により閉鎖されていて流 体室におけるブレードのブレード部における上流側と下流側とは非連通状態にあ る。このため、流体室においてはブレードの相対回転により流体圧が発生して、 この流体圧に起因して押圧力発生手段においては作動回転数に応じた押圧力が発 生する。このため、同押圧力の作用にて作動ピストンが摩擦クラッチを押圧して 摩擦係合させ、内外両回転部材間では設定された通りのトルク伝達がなされる。 In the driving force transmission device having such a configuration, when the device or the viscous fluid does not reach a predetermined high temperature, the communication passage provided in the blade is closed by the action of the closing means, and the upstream portion of the blade portion of the blade in the fluid chamber is closed. There is no communication between the side and the downstream side. Therefore, in the fluid chamber, a fluid pressure is generated by the relative rotation of the blades, and due to this fluid pressure, the pressing force generating means generates a pressing force according to the operating speed. Therefore, the actuating piston pushes the friction clutch into frictional engagement by the action of the same pressing force, and the set torque is transmitted between the inner and outer rotating members.
【０００８】 また、摩擦クラッチから発生する摩擦熱等により装置または粘性流体が所定以 上の高温に達すると、流体室においては閉鎖手段の作用により連通路が開成され 、流体室内におけるブレード部の上流側と下流側とを連通させる。このため、ブ レードの相対回転時にブレード部の上流側に位置する粘性流体が連通路を通って ブレード部の下流側へ流動し、ブレード部の上流側での流体圧の発生が規制され る。従って、装置または粘性流体が異常の高温に達した場合には押圧力発生手段 における作動ピストンに対する押圧力の発生はなく、摩擦クラッチの摩擦係合が 解除されてそれ以上の摩擦熱の発生を阻止する。この結果、摩擦クラッチはそれ 以上高温になることはなく、摩擦クラッチにおけるハンプ現象の発生および焼損 の発生が防止される。When the device or the viscous fluid reaches a temperature higher than a predetermined level due to frictional heat generated from the friction clutch, the communication passage is opened in the fluid chamber by the action of the closing means, and the upstream of the blade portion in the fluid chamber is opened. Side and the downstream side are communicated. Therefore, the viscous fluid located on the upstream side of the blade portion flows through the communication passage to the downstream side of the blade portion during relative rotation of the blade, and the generation of fluid pressure on the upstream side of the blade portion is restricted. Therefore, when the device or viscous fluid reaches an abnormally high temperature, no pressing force is generated on the working piston by the pressing force generation means, and the friction engagement of the friction clutch is released to prevent further friction heat generation. To do. As a result, the friction clutch does not reach a higher temperature, and the hump phenomenon and the burnout of the friction clutch are prevented.
【０００９】[0009]
以下本考案の実施例を図面に基づいて説明するに、図１には本考案にかかる駆 動力伝達装置の一実施例が示されている。当該駆動力伝達装置１０は図５に示す ように、リアルタイム式の四輪駆動車の後輪側動力伝達系路に配設される。当該 車両は前輪側が常時駆動するとともに後輪側が必要時駆動するもので、エンジン ２１の一側に組付けたトランスアクスル２２はトランスミッションおよびトラン スフアを備え、エンジン２１からの動力をアクスルシャフト２３に出力して前輪 ２４を駆動させるとともに、第１プロペラシャフト２５に出力する。第１プロペ ラシャフト２５は駆動力伝達装置１０を介して第２プロペラシャフト２６に連結 していて、これら両シャフト２５，２６がトルク伝達可能な場合動力がリヤディ ファレンシャル２７を介してアクスルシャフト２８に出力され、後輪２９が駆動 する。 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a driving force transmission device according to the present invention. As shown in FIG. 5, the driving force transmission device 10 is arranged on a rear wheel side power transmission system path of a real-time four-wheel drive vehicle. The vehicle is always driven by the front wheels and driven by the rear wheels when necessary. The transaxle 22 mounted on one side of the engine 21 has a transmission and a transfer gear, and outputs the power from the engine 21 to the axle shaft 23. Then, the front wheels 24 are driven and output to the first propeller shaft 25. The first propeller shaft 25 is connected to the second propeller shaft 26 via the driving force transmission device 10, and when both the shafts 25, 26 can transmit torque, power is transmitted to the axle shaft 28 via the rear differential 27. It is output and the rear wheels 29 are driven.
【００１０】 駆動力伝達装置１０は外側回転部材であるアウタケース１１およびエンドカバ ー１２と、内側回転部材であるインナシャフト１３からなる環状の作動室内に押 圧力発生手段１０ａおよび摩擦クラッチ１０ｂを備えている。アウタケース１１ は所定長さの筒部１１ａの一端に内向フランジ部１１ｂを備え、筒部１１ａの他 端開口部にエンドカバー１２が螺着されている。インナシャフト１３は所定長さ の段付きの筒部１３ａの中間部外周に外向フランジ部１３ｂを備え、フランジ部 １３ｂの外周には軸方向へ延びる外スプライン部１３ｃが形成され、かつ筒部１ ３ａの一端側内周には軸方向へ延びる内スプライン部１３ｄが形成されている。 かかるインナシャフト１３においては、その筒部１３ａの一端がアウタケース１ １の内向フランジ部１１ｂの内孔内に、かつその他端がエンドカバー１２の内孔 内に液密的かつ回転可能に嵌合されて支持されている。インナシャフト１３はそ の内スプライン部１３ｄにて第２プロペラシャフト２６の先端部のスプラインに 嵌合して固定され、かつアウタケース１１は第１プロペラシャフト２５の後端に 固定されている。The driving force transmission device 10 includes an outer case 11 and an end cover 12 which are outer rotating members, and a pressing force generating means 10 a and a friction clutch 10 b in an annular working chamber which is composed of an inner shaft 13 which is an inner rotating member. There is. The outer case 11 is provided with an inward flange portion 11b at one end of a tubular portion 11a having a predetermined length, and an end cover 12 is screwed into the other end opening portion of the tubular portion 11a. The inner shaft 13 is provided with an outward flange portion 13b on the outer periphery of the middle portion of a stepped cylindrical portion 13a having a predetermined length, an outer spline portion 13c extending in the axial direction is formed on the outer periphery of the flange portion 13b, and the cylindrical portion 13a is formed. An inner spline portion 13d extending in the axial direction is formed on the inner periphery of one end side of the. In the inner shaft 13, one end of the tubular portion 13a is fitted in the inner hole of the inward flange portion 11b of the outer case 11 and the other end is fitted in a liquid tight and rotatable manner in the inner hole of the end cover 12. Has been supported. The inner shaft 13 is fitted and fixed to the spline at the tip of the second propeller shaft 26 at the inner spline portion 13d, and the outer case 11 is fixed to the rear end of the first propeller shaft 25.
【００１１】 押圧力発生手段１０ａは作動ピストン１４、ブレード１５およびロータ１６を 備え、かつ摩擦クラッチ１０ｂは湿式多板クラッチ式のもので、多数のクラッチ プレート１７ａおよびクラッチディスク１７ｂを備える。各クラッチプレート１ ７ａはその外周のスプライン部をアウタケース１１の内周に設けたスプライン部 １１ｃに嵌合されて、同ケース１１に一体回転可能かつ軸方向へ移動可能に組付 けられている。各クラッチディスク１７ｂはその内周のスプライン部をインナシ ャフト１３の外スプライン部１３ｃに嵌合されて各クラッチプレート１７ａ間に 位置し、同シャフト１３に一体回転可能かつ軸方向へ移動可能に組付けられてい る。これらのクラッチプレート１７ａおよびクラッチディスク１７ｂの収容室に はクラッチオイルと気体とが所定量封入されている。The pressing force generating means 10a comprises an operating piston 14, a blade 15 and a rotor 16, and the friction clutch 10b is of a wet multi-plate clutch type and comprises a large number of clutch plates 17a and clutch discs 17b. Each clutch plate 17a has a spline portion on the outer periphery thereof fitted to a spline portion 11c provided on the inner periphery of the outer case 11, and is assembled to the case 11 so as to be integrally rotatable and movable in the axial direction. .. Each clutch disc 17b has its inner peripheral spline portion fitted to the outer spline portion 13c of the inner shaft 13 so as to be positioned between the respective clutch plates 17a, and is assembled to the shaft 13 so as to be integrally rotatable and axially movable. It is being done. A predetermined amount of clutch oil and gas is sealed in the chambers for accommodating the clutch plate 17a and the clutch disc 17b.
【００１２】 しかして、押圧力発生手段１０ａを構成する作動ピストン１４はアウタケース １１の筒部１１ａの他端側内周に液密的に一体回転可能かつ軸方向へ摺動可能に 、またインナシャフト１３に対してはその外周に液密的に回転可能かつ軸方向へ 摺動可能にそれぞれ組付けられていて、その一側面にて図示最右端のクラッチプ レート１７ａに当接している。ブレード１５は図１〜図３に示すように、環状ボ ス部１５ａの外周の互に等間隔離れた部位にて半径方向へ延びる３枚のブレード 部１５ｂを備え、図２および図３に示すように作動ピストン１４の他端面に固着 されている。一方、作動ピストン１４の他端面にはブレード１５の各ブレード部 １５ｂの周方向の幅よりわずかに長い溝部が形成されており、同溝部はブレード 部１５ｂによりブレード部１５ｂの上流側と下流側とを連通する連結路ｐに形成 されている。各連通路ｐの略中央部にはバイメタル製の弁１８が配設されている 。弁１８は装置１０および粘性流体が２００℃に達するまでは図４の（ａ）に示 すように連通路ｐを閉鎖していて、２００℃に達すると同図の（ｂ）に示すよう に連通路ｐを開成すべく機能する。Accordingly, the working piston 14 constituting the pressing force generating means 10a is liquid-tightly integrally rotatable with the inner circumference of the other end side of the cylindrical portion 11a of the outer case 11 and slidable in the axial direction. The shaft 13 is mounted on the outer periphery thereof in a liquid-tight manner so as to be rotatable in a liquid-tight manner and slidable in the axial direction, and one side surface of the shaft 13 is in contact with the clutch plate 17a at the right end in the drawing. As shown in FIGS. 1 to 3, the blade 15 is provided with three blade portions 15b that extend in the radial direction at portions of the outer circumference of the annular boss portion 15a that are equally spaced apart from each other, and are shown in FIGS. Thus, it is fixed to the other end surface of the working piston 14. On the other hand, the other end surface of the working piston 14 is formed with a groove portion which is slightly longer than the circumferential width of each blade portion 15b of the blade 15, and the groove portion is formed by the blade portion 15b between the upstream side and the downstream side of the blade portion 15b. Is formed in a connecting path p that communicates with each other. A valve 18 made of bimetal is arranged at a substantially central portion of each communication passage p. The valve 18 closes the communication passage p as shown in FIG. 4 (a) until the temperature of the device 10 and the viscous fluid reaches 200 ° C., and when it reaches 200 ° C., as shown in FIG. 4 (b). It functions to open the communication passage p.
【００１３】 ロータ１６は円盤状のものでそのボス部にてインナシャフト１３の筒部１３ａ 外周にスプライン嵌合され、同シャフト１３に対して一体回転可能に組付けられ ている。かかるロータ１６はアウタカバー１２の一側に設けた環状凹所１２ａ１ ２ａ内に位置してエンドカバー１２とは相対回転可能に摺接している。また、環 状凹所１２ａ内のロータ１６側は流体室になっており、同流体室内に作動ピスト ン１４に固着したブレード１５が配置されている。この流体室内にはシリコンオ イル等高粘性流体と空気とが所定量封入されており、またブレード１５は流体室 内を各ブレード部１５により３つの滞留室Ｒに区画している。粘性流体は各滞留 室Ｒ内に封入されている。The rotor 16 has a disk shape, and is spline-fitted to the outer circumference of the cylindrical portion 13 a of the inner shaft 13 by its boss portion, and is integrally rotatably assembled to the shaft 13. The rotor 16 is located in an annular recess 12a12a provided on one side of the outer cover 12 and is in sliding contact with the end cover 12 so as to be rotatable relative thereto. The rotor 16 side in the annular recess 12a is a fluid chamber, and the blade 15 fixed to the working piston 14 is arranged in the fluid chamber. A predetermined amount of highly viscous fluid such as silicon oil and air are enclosed in this fluid chamber, and the blade 15 divides the inside of the fluid chamber into three retention chambers R by the blade portions 15. The viscous fluid is enclosed in each retention chamber R.
【００１４】 かかる構成の駆動力伝達装置１０においては、装置および粘性流体が２００℃ 未満の場合にはブレード１５が形成する連通路ｐは弁１８の作用により閉鎖され ていて、各滞留室Ｒにおけるブレード１５のブレード部１５ｂの上流側と下流側 とは非連通状態にある。従って、当該駆動力伝達装置１０においては、第１、第 ２両プロペラシャフト２５，２６間に相対回転が生じるとトルク伝達がなされる 。すなわち、これら両シャフト２５，２６に相対回転が生じると、第１プロペラ シャフト２５に一体回転可能に組付けられているアウタケース１１、エンドカバ ー１２、作動ピストン１４およびブレード１５と、第２プロペラシャフト２６に 一体回転可能に組付けられているインナシャフト１３およびロータ１６との間に 相対回転が生じる。従って、押圧力発生手段１０ａの流体室内においては、滞留 室Ｒ内の粘性流体が相対回転数に比例した速度にて強制的に流動させられ、周方 向に順次相対移行する滞留室Ｒ内では流動抵抗に起因してブレード部１５ｂの下 流側端から次のブレード部１５ｂの上流側端に向って漸次増圧される圧力分布が 発生する。この圧力分布の増圧部分は差動回転数に比例して増大するもので、作 動ピストン１４を軸方向へ押圧する。この結果、作動ピストン１４は摩擦クラッ チ１０ｂを押圧し、各クラッチプレート１７ａとクラッチディスク１７ｂをクラ ッチオイルを介して摩擦係合させる。これにより、摩擦クラッチ１０ｂにおいて は差動回転数に比例したトルクをアウタケース１１からインナシャフト１３に伝 達し、車両は４輪駆動状態となる。また、この４輪駆動状態においては前後輪の 差動回転を許容し、タイトコーナブレーキング現象の発生も防止される。In the driving force transmission device 10 having such a configuration, the communication passage p formed by the blade 15 is closed by the action of the valve 18 when the device and the viscous fluid are below 200 ° C. The upstream side and the downstream side of the blade portion 15b of the blade 15 are not in communication with each other. Therefore, in the driving force transmission device 10, torque is transmitted when relative rotation occurs between the first and second propeller shafts 25 and 26. That is, when the two shafts 25 and 26 rotate relative to each other, the outer case 11, the end cover 12, the working piston 14 and the blade 15 that are integrally rotatably assembled to the first propeller shaft 25, and the second propeller shaft. Relative rotation occurs between the inner shaft 13 and the rotor 16, which are integrally rotatably mounted on the rotor 26. Therefore, in the fluid chamber of the pressing force generating means 10a, the viscous fluid in the retention chamber R is forcibly flown at a speed proportional to the relative rotation speed, and in the retention chamber R sequentially moving in the circumferential direction. Due to the flow resistance, a pressure distribution in which the pressure is gradually increased from the downstream end of the blade portion 15b toward the upstream end of the next blade portion 15b is generated. The pressure-increased portion of this pressure distribution increases in proportion to the differential rotation speed, and presses the working piston 14 in the axial direction. As a result, the working piston 14 presses the friction clutch 10b to frictionally engage the clutch plates 17a and the clutch disc 17b with each other through the clutch oil. As a result, in the friction clutch 10b, torque proportional to the differential rotation speed is transmitted from the outer case 11 to the inner shaft 13, and the vehicle is in the four-wheel drive state. Further, in this four-wheel drive state, differential rotation of the front and rear wheels is allowed, and the occurrence of the tight corner braking phenomenon is prevented.
【００１５】 ところで、当該駆動力伝達装置１０においては、摩擦クラッチ１０ｂから発生 する摩擦熱により装置または粘性流体が２００℃以上の温度に達すると、ブレー ド１５が形成する連通路ｐは弁１８の作用により開成されて、各滞留室Ｒにおい てはブレード１５の各ブレード部１５ｂの上流側と下流側とを連通させる。この ため、ブレード１５の相対回転時にブレード部１５ｂの上流側に位置する粘性流 体が連通路ｐを通ってブレード部１５ｂの下流側へ流動し、ブレード部１５ｂの 上流側での流体圧の発生が規制される。従って、装置および粘性流体が２００℃ 以上という高温に達した場合には押圧力発生手段１０ａにおける作動ピストン１ ４に対する押圧力の発生はなく、摩擦クラッチ１０ｂの摩擦係合が解除されてそ れ以上の摩擦熱の発生を阻止する。この結果、摩擦クラッチ１０ｂはそれ以上高 温になることはなく、摩擦クラッチ１０ｂにおけるハンプ現象の発生および焼損 の発生が防止される。By the way, in the driving force transmission device 10, when the temperature of the device or the viscous fluid reaches 200 ° C. or higher due to the friction heat generated from the friction clutch 10 b, the communication passage p formed by the blade 15 is connected to the communication passage p of the valve 18. It is opened by the action, and in each retention chamber R, the upstream side and the downstream side of each blade portion 15b of the blade 15 are communicated with each other. Therefore, when the blade 15 rotates relatively, the viscous fluid located on the upstream side of the blade portion 15b flows to the downstream side of the blade portion 15b through the communication passage p, and the fluid pressure is generated on the upstream side of the blade portion 15b. Is regulated. Therefore, when the temperature of the device and the viscous fluid reaches a high temperature of 200 ° C. or higher, no pressing force is generated on the working piston 14 in the pressing force generation means 10a, and the frictional engagement of the friction clutch 10b is released. Prevent the generation of frictional heat. As a result, the friction clutch 10b does not reach a higher temperature, and the hump phenomenon and the burnout of the friction clutch 10b are prevented.
【図１】本考案の一実施例に係る駆動力伝達装置の断面
図である。FIG. 1 is a sectional view of a driving force transmission device according to an embodiment of the present invention.
【図２】同装置を構成する作動ピストンおよびこれと一
体のブレードの正面図である。FIG. 2 is a front view of an operating piston and a blade integrated with the operating piston that constitute the same device.
【図３】作動ピストンおよびこれと一体のブレードの断
面図である。FIG. 3 is a sectional view of an actuating piston and a blade integral therewith.
【図４】同装置に配設した弁の作動説明図である。FIG. 4 is an operation explanatory view of a valve arranged in the device.
【図５】同装置を装備した車両の概略図である。FIG. 5 is a schematic view of a vehicle equipped with the same device.
１０…駆動力伝達装置、１０ａ…押圧力発生手段、１０
ｂ…摩擦クラッチ、１１…アウタケース、１３…インナ
シャフト、１４…作動ピストン、１５…ブレード、１５
ｂ…ブレード部、１６…ロータ、１８…弁、２５，２６
…プロペラシャフト、ｐ…連通路、Ｒ…滞留室（流体
室）。10 ... Driving force transmission device, 10a ... Pressing force generating means, 10
b ... Friction clutch, 11 ... Outer case, 13 ... Inner shaft, 14 ... Working piston, 15 ... Blade, 15
b ... blade part, 16 ... rotor, 18 ... valve, 25, 26
... propeller shaft, p ... communicating passage, R ... retention chamber (fluid chamber).
Claims (1)
回転部材間に配設され、これら両回転部材の相対回転に
より作動して両回転部材をトルク伝達可能に連結する摩
擦係合力を発生させるとともに付与される軸方向の押圧
力に応じて前記摩擦係合力を増減させる摩擦クラッチ、
および前記両回転部材の相対回転に応じた軸方向の押圧
力を発生させて同押圧力を前記摩擦クラッチに付与する
押圧力発生手段を備え、同押圧力発生手段を、前記両回
転部材間に液密的に軸方向へ摺動可能かつ外側回転部材
に一体回転可能に組付けられて前記摩擦クラッチの一側
に対向する作動ピストンと、前記外側回転部材と前記作
動ピストン間に形成され軸方向に所定間隔を有して粘性
流体が封入される流体室と、半径方向へ延びる１または
複数のブレード部を有し前記流体室にて前記内外両回転
部材のいずれか一方と一体回転可能に設けられ回転時前
記流体室内に流体圧を発生させるブレードとにより構成
してなる駆動力伝達装置において、前記ブレードと前記
流体室の内壁間に前記ブレード部の上流側と下流側とを
連通する連通路を設けるとともに、同連通路に所定の高
温に達したとき同連通路を開成する感温性の閉鎖手段を
設けたことを特徴とする駆動力伝達装置。1. A frictional engagement force which is disposed between both inner and outer rotating members coaxially and relatively rotatably positioned and which is actuated by relative rotation of these both rotating members to couple the both rotating members so that torque can be transmitted. And a friction clutch that increases or decreases the friction engagement force according to the axial pressing force applied,
And a pressing force generation means for generating a pressing force in the axial direction according to the relative rotation of the rotating members and applying the pressing force to the friction clutch, the pressing force generating means being provided between the rotating members. A working piston that is liquid-tightly slidable in the axial direction and integrally rotatably mounted on the outer rotating member and faces one side of the friction clutch; and an axial direction formed between the outer rotating member and the working piston. A fluid chamber in which a viscous fluid is enclosed at a predetermined interval, and one or a plurality of blade portions extending in the radial direction, and the fluid chamber is provided so as to be integrally rotatable with either one of the inner and outer rotating members. In a driving force transmission device configured by a blade that generates a fluid pressure in the fluid chamber when rotated, a communication passage that connects the upstream side and the downstream side of the blade portion between the blade and the inner wall of the fluid chamber. To Kicking with, driving force transmission device, characterized in that in the communication passage is provided a closure means of the temperature-sensitive resistance to open the same communication path upon reaching a predetermined elevated temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1594892U JPH0579068U (en) | 1992-03-26 | 1992-03-26 | Driving force transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1594892U JPH0579068U (en) | 1992-03-26 | 1992-03-26 | Driving force transmission device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0579068U true JPH0579068U (en) | 1993-10-26 |
Family
ID=11902991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1594892U Pending JPH0579068U (en) | 1992-03-26 | 1992-03-26 | Driving force transmission device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0579068U (en) |
-
1992
- 1992-03-26 JP JP1594892U patent/JPH0579068U/en active Pending
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