JP3715001B2 - Power transmission device for four-wheel drive vehicle - Google Patents

Power transmission device for four-wheel drive vehicle Download PDF

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Publication number
JP3715001B2
JP3715001B2 JP22828695A JP22828695A JP3715001B2 JP 3715001 B2 JP3715001 B2 JP 3715001B2 JP 22828695 A JP22828695 A JP 22828695A JP 22828695 A JP22828695 A JP 22828695A JP 3715001 B2 JP3715001 B2 JP 3715001B2
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Japan
Prior art keywords
hydraulic
power transmission
oil
oil passage
transmission system
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JP22828695A
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Japanese (ja)
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JPH0971142A (en
Inventor
哲郎 浜田
耕治 黒田
和典 小林
孝行 矢古宇
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、エンジンの駆動力を第1駆動輪に伝達する第1動力伝達系と、第1動力伝達系の駆動力を第2駆動輪に伝達する第2動力伝達系と、第2動力伝達系に介装されて第2駆動輪に対する駆動力の伝達を制御する油圧クラッチと、油圧クラッチに作動油を供給する油圧ポンプとを備えた四輪駆動車両の動力伝達装置に関する。
【0002】
【従来の技術】
かかる四輪駆動車両の動力伝達装置は、特開平2−286429号公報により既に知られている。
【0003】
【発明が解決しようとする課題】
ところで、上記特開平2−286429号公報に記載されたものは、油圧ポンプをエンジンのクランク軸で直接駆動するようにした場合には、油圧ポンプと油圧クラッチとの距離が大きくなって配管が長大になり、配管のレイアウトに支障を来すという問題がある。また油圧ポンプを電気モータで駆動するようにした場合には、油圧ポンプ用の特別の電気モータが必要になってコストが増加する問題がある。
【0004】
本発明は前述の事情に鑑みてなされたもので、四輪駆動車両の動力伝達装置において、油圧ポンプと油圧クラッチとを接続する長大な配管や油圧ポンプを駆動する特別の電気モータを不要とし、更に油圧ポンプから吐出された作動油を油圧クラッチの作動油室に供給する油路からリリーフした余剰の作動油を所定圧の潤滑油として油圧クラッチの摩擦板を潤滑できるようにしている。
【0005】
【課題を解決するための手段】
上記目的を達成するために、請求項1に記載された発明は、エンジンの駆動力を第1駆動輪に伝達する第1動力伝達系と、その第1動力伝達系の駆動力を第2駆動輪に伝達する第2動力伝達系を備えた、四輪駆動車両の動力伝達装置において、前記第2動力伝達系が、前記第1動力伝達系と前記第2駆動輪との間に在って該第1動力伝達系の駆動力を該第2駆動輪に伝達するプロペラシャフトと、前記第1動力伝達系から前記第2動力伝達系への駆動力の伝達を制御すべく前記プロペラシャフトと前記第2駆動輪との間に設けられる油圧クラッチと、その油圧クラッチに油圧回路を介して接続されると共に前記プロペラシャフトに駆動されて該プロペラシャフトの回転に応じた油圧を該油圧回路に供給する油圧ポンプとを備え、前記油圧回路、オイルタンクから前記油圧ポンプに作動油を供給する第1の油路と、前記油圧ポンプから吐出された作動油を前記油圧クラッチの作動油室に供給する第2の油路と、その第2の油路に設けられて前記油圧ポンプから吐出された作動油を調圧し得るリニアソレノイドバルブと、前記第2の油路から分岐して余剰の作動油を前記油圧クラッチの摩擦板に導く第3の油路と、その第3の油路に介装される第1のリリーフ弁と、その第1のリリーフ弁の下流側で前記第3の油路から分岐して該第3の油路を前記オイルタンクに接続する第4の油路と、その第4の油路に介装される第2のリリーフ弁とを備えていて、車両発進時には前記リニアソレノイドバルブを制御することにより前記油圧クラッチを係合させることを特徴とする。
【0006】
上記特徴によれば、油圧ポンプを駆動する電気モータ等の特別の駆動源が不要になるばかりか、油圧ポンプ及び油圧クラッチを同じ第2動力伝達系内に配置可能となり、配管の長さを短縮することができる。また、油圧ポンプから吐出された作動油は、第2の油路を経て油圧クラッチの作動油室に供給され、駆動輪に駆動力を伝達すべく油圧クラッチを係合させるが、このとき、第3の油路に介装される第1のリリーフ弁からリリーフした余剰の作動油は、第4の油路からオイルタンクへ戻るのを第2のリリーフ弁に阻止されて所定圧の潤滑油となり、その所定圧の潤滑油が第3の油路を経て油圧クラッチの摩擦板を潤滑する。
【0007】
また車両の発進時にはトランスミッションが駆動力を出力してプロペラシャフトが回転すると同時に油圧ポンプを作動させ、油圧クラッチを速やかに係合させることができるので、車両の発進時に速やかに四輪駆動状態にして発進性能を向上させることができる。
【0008】
【発明の実施の形態】
以下、本発明の実施の形態を、添付図面に示した本発明の実施例に基づいて説明する。
図1及び図2は本発明の第1実施例を示すもので、図1は四輪駆動車両の動力伝達装置のスケルトン図、図2は油圧回路図である。
【0009】
図1に示すように、四輪駆動車両Vは車体前部に横置きに配置したエンジンEと、このエンジンEの右側面に結合したトランスミッションMとを備える。トランスミッションMの駆動力を左右の前輪WFL,WFRに伝達する第1動力伝達系D1 は、トランスミッションMの出力軸1に設けた第1スパーギヤ2と、第1スパーギヤ2に噛合する第2スパーギヤ3と、第2スパーギヤ3により駆動されるベベルギヤ式のフロントディファレンシャル4と、フロントディファレンシャル4から左右に延出して前輪WFL,WFRに接続される左右の車軸5,5とから構成される。
【0010】
第1動力伝達系の駆動力を後輪WRL,WRRに伝達する第2動力伝達系D2 は、フロントディファレンシャル4のディファレンシャルボックスに設けた第3スパーギヤ6と、第3スパーギヤ6に噛合する第4スパーギヤ7と、第4スパーギヤ7と一体に回転する第1ベベルギヤ8と、第1ベベルギヤ8に噛合する第2ベベルギヤ9と、前端に第2ベベルギヤ9を備えて車体後方に延びるプロペラシャフトSと、プロペラシャフトSの後端に設けた第3ベベルギヤ10と、第3ベベルギヤ10に噛合する第4ベベルギヤ11と、第4ベベルギヤ11により駆動されるリヤディファレシャル12と、リヤディファレンシャル12から左右に延出して後輪WRL,WRRに接続される左右の車軸13,13とを備える。
【0011】
更に第2動力伝達系D2 は、プロペラシャフトSの中間部に直列に介装された油圧ポンプPと油圧クラッチCとを備えており、油圧ポンプPは動力伝達方向の上流側(フロントディファレンシャル4側)に配置され、油圧クラッチCは動力伝達方向の下流側(リヤディファレンシャル12側)に配置される。油圧クラッチCは後述する油圧回路を介して油圧ポンプPに接続されており、この油圧ポンプPが吐出する作動油により係合する。
【0012】
図2に示すように、オイルタンク21から油路L1 を介して作動油を汲み上げる油圧ポンプPは、車両Vの前進及び後進に伴ってプロペラシャフトSの回転方向が反転した場合に、作動油の吐出方向が反転するものである。従って、プロペラシャフトSの回転方向に関わらず油圧クラッチCに作動油を供給すべく、その吸入側の油路L1 との間に2個のチェック弁22,22が装着されるとともに、その吐出側の油路L2 との間に2個のチェック弁23,23が装着される。
【0013】
油圧ポンプPの下流側に連なる前記油路L2 は、チェック弁24を介してアキュムレータAに接続される。アキュムレータAの下流側に連なる油路L3 はチェック弁25を介してリニアソレノイドバルブ26に接続され、更にリニアソレノイドバルブ26の下流に連なる油路L4 は油圧クラッチCの作動油室27に接続される。リニアソレノイドバルブ26ら排出された余剰の作動油は、油路L5 を介して油圧ポンプPの上流側の油路L1 に還流する。
【0014】
リニアソレノイドバルブ26及び油圧クラッチCの作動油室27間の油路L4 からは圧力センサ28及び第1のリリーフ弁29を直列に介装した油路L6 が分岐しており、この油路L6 の下流側は油路L7 及び油路L8 に分岐する。一方の油路L7 は油圧クラッチCの摩擦板30…間に連通するとともに、他方の油路L8 リリーフ弁31を介してオイルタンク21に連通する。
【0015】
而して、油圧ポンプPから吐出された作動油はアキュムレータAに蓄圧された後、リニアソレノイドバルブ26で調圧されて油圧クラッチCの作動油室27に供給され、後輪WRL,WRRに駆動力を伝達すべく油圧クラッチCを所定の係合力で係合させる。このとき、圧力センサ28で検出した作動油室27の圧力に基づいてリニアソレノイドバルブ26の開度がフィードバック制御される。リリーフ弁29からリリーフした作動油はリリーフ弁31に阻止されて所定圧の潤滑油となり、油圧クラッチCの摩擦板30…を潤滑する。
【0016】
上述のようにしてリニアソレノイドバルブ26を制御することにより油圧クラッチCを係合解除すると、エンジンEの駆動力は前輪WFL,WFRだけに伝達されて前輪駆動状態になり、また油圧クラッチCを係合するとエンジンEの駆動力は前輪WFL,WFR及び後輪WRL,WRRの両方に伝達されて四輪駆動状態になる。そして油圧クラッチCの係合力を変化させることにより、前輪WFL,WFR及び後輪WRL,WRR間の駆動力の配分比率を変化させることができる。
【0017】
車両Vの発進時には発進性能を向上させるべく油圧クラッチCを係合させて四輪駆動状態にするが、油圧ポンプPが油圧クラッチCよりも動力伝達方向上流側に配置されるため、トランスミッションMが駆動力を出力してプロペラシャフトSが回転すると同時に油圧ポンプPを作動させ、油圧クラッチCを速やかに係合させることができる。これにより、車両Vの発進時に速やかに四輪駆動状態にして発進性能を向上させることができる。
【0018】
またエンジンEの駆動力で油圧ポンプPを駆動しているので電気モータ等の特別の駆動源が不要になり、コストの削減に寄与することができる。しかも油圧ポンプPと油圧クラッチCとを相互に接近して配置することができるので、エンジンEのクランク軸で油圧ポンプPを駆動する場合に比べて配管の長さを短縮することができ、更に車体前後方向に長いプロペラシャフトSに沿う任意の位置に油圧ポンプPを配置して設計自由度を高めることができる。
【0019】
次に、図3及び図4に基づいて本発明の第2実施例を説明する。
【0020】
第2実施例は、第1実施例におけるリヤディファレンシャル12を廃止し、且つプロペラシャフトSに介装したクラッチCに代えて左右の車軸13,13にそれぞれ左油圧クラッチCL 及び右油圧クラッチCR を設けたものである。
【0021】
この第2実施例によっても、油圧クラッチCL ,CR を係合或いは係合解除することにより四輪駆動状態及び前輪駆動状態を切り換えることができ、しかも油圧クラッチCL ,CR の係合力を変化させることにより、前輪WFL,WFR及び後輪WRL,WRR間の駆動力の配分比率を変化させることができる。
【0022】
また、油圧クラッチCL ,CR よりも動力伝達方向上流側のプロペラシャフトSに油圧ポンプPを配置したので、第1実施例と同様に車両Vの発進時に速やかに四輪駆動状態にして発進性能を向上させることができる。更に電気モータ等の特別の駆動源が不要である点及び配管の長さを短縮することができる点に関しても、第1実施例と同様の作用効果を得ることが可能である。
【0023】
図5は本発明の第3実施例を示すもので、この第3実施例は左クラッチCL 及び右クラッチCR の係合状態を、それぞれ対応するリニアソレノイドバルブ26L ,26R により個別に制御することができる。
【0024】
この第3実施例によれば、前記第2実施例の作用効果に加えて、左右の後輪WRL,WRRに分配される駆動力の配分比率を変化させて旋回性の向上及び直進安定性の向上を図ることができる。
【0025】
以上、本発明の実施例を詳述したが、本発明はその要旨を逸脱しない範囲で種々の設計変更を行うことができる。
【0026】
【発明の効果】
以上のように本発明によれば、油圧ポンプを駆動する電気モータ等の特別の駆動源が不要になるばかりか、油圧ポンプ及び油圧クラッチを同じ第2動力伝達系内に配置可能となって配管の長さを短縮することができる。また、油圧ポンプから吐出された作動油は、第2の油路を経て油圧クラッチの作動油室に供給され、駆動輪に駆動力を伝達すべく油圧クラッチを係合させるが、このとき、第3の油路に介装される第1のリリーフ弁からリリーフした余剰の作動油は、第4の油路からオイルタンクへ戻るのを第2のリリーフ弁に阻止されて所定圧の潤滑油となり、その所定圧の潤滑油が第3の油路を経て油圧クラッチの摩擦板が供給され、その摩擦板を潤滑することができる。
【0027】
また車両の発進時にはトランスミッションが駆動力を出力してプロペラシャフトが回転すると同時に油圧ポンプを作動させ、油圧クラッチを速やかに係合させることができるので、車両の発進時に速やかに四輪駆動状態にして発進性能を向上させることができる。
【図面の簡単な説明】
【図1】 四輪駆動車両の動力伝達装置のスケルトン図
【図2】 動力伝達装置の油圧回路図
【図3】 第2実施例に係る、前記図1に対応する図
【図4】 第2実施例に係る、前記図2に対応する図
【図5】 第3実施例に係る、前記図2に対応する図
【符号の説明】
C 油圧クラッチ
L 左油圧クラッチ(油圧クラッチ)
R 右油圧クラッチ(油圧クラッチ)
1 第1動力伝達系
2 第2動力伝達系
E エンジン
1 油路(第1の油路)
2 〜L4 油路(第2の油路)
6 ,L7 油路(第3の油路)
8 油路(第4の油路)
P 油圧ポンプ
S プロペラシャフト
FL,WFR 前輪(第1駆動輪)
RL,WRR 後輪(第2駆動輪)
21 オイルタンク
29 リリーフ弁(第1のリリーフ弁)
30 摩擦板
31 リリーフ弁(第2のリリーフ弁)
[0001]
BACKGROUND OF THE INVENTION
The present invention includes a first power transmission system that transmits driving force of an engine to first driving wheels, a second power transmission system that transmits driving force of the first power transmission system to second driving wheels, and a second power transmission. The present invention relates to a power transmission device for a four-wheel drive vehicle that includes a hydraulic clutch that is interposed in the system and controls transmission of driving force to a second driving wheel, and a hydraulic pump that supplies hydraulic oil to the hydraulic clutch.
[0002]
[Prior art]
Such a power transmission device for a four-wheel drive vehicle is already known from Japanese Patent Laid-Open No. 2-286429.
[0003]
[Problems to be solved by the invention]
By the way, what is described in the above-mentioned Japanese Patent Application Laid-Open No. 2-286429 is that when the hydraulic pump is directly driven by the crankshaft of the engine, the distance between the hydraulic pump and the hydraulic clutch becomes large and the piping is long. Therefore, there is a problem that the layout of the piping is hindered. Further, when the hydraulic pump is driven by an electric motor, a special electric motor for the hydraulic pump is required, which increases the cost.
[0004]
The present invention has been made in view of the above circumstances, and in the power transmission device of a four-wheel drive vehicle, a long electric pipe connecting a hydraulic pump and a hydraulic clutch and a special electric motor for driving the hydraulic pump are unnecessary, Furthermore, the friction plate of the hydraulic clutch can be lubricated by using the excess hydraulic oil that has been relieved from the oil passage that supplies the hydraulic oil discharged from the hydraulic pump to the hydraulic oil chamber of the hydraulic clutch.
[0005]
[Means for Solving the Problems]
To achieve the above object, the invention described in claim 1 includes a first power transmission system for transmitting the driving force of the engine to the first drive wheel, the driving force of the first power transmission system the second drive and a second power transmission system for transmitting the wheel, a power transmission system for a four wheel drive vehicle, the second power transmission system, lies between said second drive wheel and the first power transmission system A propeller shaft for transmitting the driving force of the first power transmission system to the second driving wheel, and the propeller shaft for controlling transmission of the driving force from the first power transmission system to the second power transmission system; A hydraulic clutch provided between the second driving wheel and a hydraulic clutch connected to the hydraulic clutch via a hydraulic circuit and driven by the propeller shaft to supply hydraulic pressure according to the rotation of the propeller shaft to the hydraulic circuit. and a hydraulic pump to the hydraulic rotary But a first oil passage for supplying hydraulic fluid to the hydraulic pump from the oil tank, and a second oil passage for supplying the hydraulic fluid discharged from the hydraulic pump to the hydraulic oil chamber of the hydraulic clutch, the first a linear solenoid valve provided in the second oil path may by regulating the hydraulic fluid discharged from said hydraulic pump, first directing excess hydraulic fluid is branched from the second oil passage to the friction plate of the hydraulic clutch 3 and the oil passage, the first relief valve interposed on the third oil passage, the oil passage of the third branches from the third oil passage on the downstream side of the first relief valve the comprise a fourth oil passage to be connected to the oil tank, and a second relief valve which is interposed in the fourth oil passage, the hydraulic by the time the vehicle starts to control the linear solenoid valve The clutch is engaged .
[0006]
According to the above feature, not only a special drive source such as an electric motor for driving the hydraulic pump is unnecessary, but also the hydraulic pump and the hydraulic clutch can be arranged in the same second power transmission system, and the length of the pipe is shortened. can do. The hydraulic oil discharged from the hydraulic pump is supplied to the hydraulic oil chamber of the hydraulic clutch through the second oil passage, and the hydraulic clutch is engaged to transmit the driving force to the driving wheels. The excess hydraulic oil that has been relieved from the first relief valve interposed in the oil passage 3 is blocked by the second relief valve from returning from the fourth oil passage to the oil tank, and becomes lubricating oil of a predetermined pressure. The lubricating oil of the predetermined pressure lubricates the friction plate of the hydraulic clutch through the third oil passage.
[0007]
Also, when the vehicle starts, the transmission outputs driving force and the propeller shaft rotates, and at the same time the hydraulic pump can be operated and the hydraulic clutch can be quickly engaged. The starting performance can be improved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
1 and 2 show a first embodiment of the present invention. FIG. 1 is a skeleton diagram of a power transmission device for a four-wheel drive vehicle, and FIG. 2 is a hydraulic circuit diagram.
[0009]
As shown in FIG. 1, the four-wheel drive vehicle V includes an engine E disposed horizontally in the front of the vehicle body and a transmission M coupled to the right side surface of the engine E. The first power transmission system D 1 that transmits the driving force of the transmission M to the left and right front wheels W FL and W FR is engaged with the first spur gear 2 provided on the output shaft 1 of the transmission M and the second spur gear 2. A spur gear 3, a bevel gear type front differential 4 driven by the second spur gear 3, and left and right axles 5, 5 extending from the front differential 4 to the left and right and connected to the front wheels W FL , W FR. .
[0010]
The second power transmission system D 2 that transmits the driving force of the first power transmission system to the rear wheels W RL and W RR meshes with the third spur gear 6 provided in the differential box of the front differential 4 and the third spur gear 6. A fourth spur gear 7, a first bevel gear 8 that rotates integrally with the fourth spur gear 7, a second bevel gear 9 that meshes with the first bevel gear 8, and a propeller shaft S that includes the second bevel gear 9 at the front end and extends rearward of the vehicle body. A third bevel gear 10 provided at the rear end of the propeller shaft S, a fourth bevel gear 11 meshing with the third bevel gear 10, a rear differential 12 driven by the fourth bevel gear 11, and left and right from the rear differential 12. And left and right axles 13 and 13 connected to the rear wheels W RL and W RR .
[0011]
Further, the second power transmission system D 2 includes a hydraulic pump P and a hydraulic clutch C that are interposed in series in the middle portion of the propeller shaft S, and the hydraulic pump P is upstream of the power transmission direction (front differential 4). The hydraulic clutch C is arranged on the downstream side (rear differential 12 side) in the power transmission direction. The hydraulic clutch C is connected to a hydraulic pump P through a hydraulic circuit described later, and is engaged by hydraulic oil discharged from the hydraulic pump P.
[0012]
As shown in FIG. 2, the hydraulic pump P that pumps hydraulic oil from the oil tank 21 through the oil passage L 1 operates when the rotation direction of the propeller shaft S is reversed as the vehicle V moves forward and backward. The discharge direction is reversed. Accordingly, in order to supply hydraulic oil to the hydraulic clutch C regardless of the direction of rotation of the propeller shaft S, the two check valves 22 and 22 are mounted between the intake side oil passage L 1 and the discharge thereof. two check valves 23, 23 are mounted between the oil passage L 2 side.
[0013]
The oil passage L 2 connected to the downstream side of the hydraulic pump P is connected to the accumulator A through a check valve 24. Oil passage L 3 connecting to the downstream side of the accumulator A is connected to the linear solenoid valve 26 via a check valve 25, the oil passage L 4 further connected to the downstream of the linear solenoid valve 26 is connected to the hydraulic oil chamber 27 of the hydraulic clutch C Is done. The linear solenoid valve 26 or we discharged surplus hydraulic oil has is refluxed to the oil passage L 1 of the upstream side of the hydraulic pump P via the oil passage L 5.
[0014]
An oil path L 6 in which a pressure sensor 28 and a first relief valve 29 are connected in series is branched from an oil path L 4 between the linear solenoid valve 26 and the hydraulic oil chamber 27 of the hydraulic clutch C. This oil path The downstream side of L 6 branches into an oil passage L 7 and an oil passage L 8 . One oil passage L 7 is communicated with between the friction plates 30 ... of the hydraulic clutch C, the other oil passage L 8 communicates with the oil tank 21 through the relief valve 31.
[0015]
Thus, after the hydraulic oil discharged from the hydraulic pump P is accumulated in the accumulator A, it is regulated by the linear solenoid valve 26 and supplied to the hydraulic oil chamber 27 of the hydraulic clutch C, and the rear wheels W RL , W RR. The hydraulic clutch C is engaged with a predetermined engaging force so as to transmit the driving force. At this time, the opening degree of the linear solenoid valve 26 is feedback controlled based on the pressure of the hydraulic oil chamber 27 detected by the pressure sensor 28. The hydraulic oil that has been relieved from the relief valve 29 is blocked by the relief valve 31 to become lubricating oil of a predetermined pressure, and lubricates the friction plates 30 of the hydraulic clutch C.
[0016]
When the hydraulic clutch C is disengaged by controlling the linear solenoid valve 26 as described above, the driving force of the engine E is transmitted only to the front wheels W FL and W FR to enter the front wheel driving state, and the hydraulic clutch C Is engaged, the driving force of the engine E is transmitted to both the front wheels W FL and W FR and the rear wheels W RL and W RR so that the four-wheel drive state is achieved. By changing the engagement force of the hydraulic clutch C, the distribution ratio of the driving force between the front wheels W FL and W FR and the rear wheels W RL and W RR can be changed.
[0017]
When starting the vehicle V, the hydraulic clutch C is engaged to improve the starting performance so as to be in a four-wheel drive state. However, since the hydraulic pump P is disposed upstream of the hydraulic clutch C in the power transmission direction, the transmission M is At the same time as the driving force is output and the propeller shaft S rotates, the hydraulic pump P is operated, and the hydraulic clutch C can be quickly engaged. As a result, when the vehicle V starts, the four-wheel drive state can be quickly set to improve the starting performance.
[0018]
Further, since the hydraulic pump P is driven by the driving force of the engine E, a special drive source such as an electric motor is not necessary, which can contribute to cost reduction. In addition, since the hydraulic pump P and the hydraulic clutch C can be disposed close to each other, the length of the pipe can be shortened compared to the case where the hydraulic pump P is driven by the crankshaft of the engine E, and The degree of freedom in design can be increased by arranging the hydraulic pump P at an arbitrary position along the propeller shaft S that is long in the longitudinal direction of the vehicle body.
[0019]
Next, a second embodiment of the present invention will be described with reference to FIGS.
[0020]
The second embodiment is abolished rear differential 12 in the first embodiment, and respectively left hydraulic clutch on the axle 13 of the left and right instead of the clutch C that is interposed in the propeller shaft S C L and the right hydraulic clutch C R Is provided.
[0021]
This second embodiment also, the hydraulic clutch C L, by a C R to disengage or engage can switch the four-wheel drive state and the front wheel drive state, moreover the hydraulic clutch C L, the engagement force of the C R By changing the driving force distribution ratio among the front wheels W FL and W FR and the rear wheels W RL and W RR .
[0022]
Further, since the hydraulic pump P is disposed on the propeller shaft S on the upstream side in the power transmission direction from the hydraulic clutches C L and C R , as in the first embodiment, the four-wheel drive state is quickly set when the vehicle V starts. Performance can be improved. Furthermore, it is possible to obtain the same effects as those of the first embodiment in that a special drive source such as an electric motor is not required and the length of the pipe can be shortened.
[0023]
Figure 5 shows a third embodiment of the present invention, the third embodiment of the engagement of the left clutch C L and the right clutch C R, the corresponding linear solenoid valve 26 L, 26 R by separately Can be controlled.
[0024]
According to the third embodiment, in addition to the operational effects of the second embodiment, the distribution ratio of the driving force distributed to the left and right rear wheels W RL , W RR is changed to improve the turning performance and the straight running stability. It is possible to improve the performance.
[0025]
As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.
[0026]
【The invention's effect】
As described above, according to the present invention, a special drive source such as an electric motor for driving the hydraulic pump is not required, and the hydraulic pump and the hydraulic clutch can be arranged in the same second power transmission system. Can be shortened. The hydraulic oil discharged from the hydraulic pump is supplied to the hydraulic oil chamber of the hydraulic clutch through the second oil passage, and the hydraulic clutch is engaged to transmit the driving force to the driving wheels. The excess hydraulic oil that has been relieved from the first relief valve interposed in the oil passage 3 is blocked by the second relief valve from returning from the fourth oil passage to the oil tank, and becomes lubricating oil of a predetermined pressure. The lubricating oil having the predetermined pressure is supplied to the friction plate of the hydraulic clutch through the third oil passage, and the friction plate can be lubricated.
[0027]
Also, when the vehicle starts, the transmission outputs driving force and the propeller shaft rotates, and at the same time the hydraulic pump can be operated and the hydraulic clutch can be quickly engaged. The starting performance can be improved.
[Brief description of the drawings]
FIG. 1 is a skeleton diagram of a power transmission device for a four-wheel drive vehicle. FIG. 2 is a hydraulic circuit diagram of the power transmission device. FIG. 3 is a diagram corresponding to FIG. FIG. 5 is a diagram corresponding to FIG. 2 according to the embodiment. FIG. 5 is a diagram corresponding to FIG. 2 according to the third embodiment.
C Hydraulic clutch C L Left hydraulic clutch (Hydraulic clutch)
CR Right hydraulic clutch (hydraulic clutch)
D 1 First power transmission system D 2 Second power transmission system E Engine L 1 oil passage (first oil passage)
L 2 ~L 4 oil passage (second oil passage)
L 6 and L 7 oil passages (third oil passage)
L 8 oil passage (fourth oil passage)
P Hydraulic pump S Propeller shaft W FL , W FR Front wheel (first drive wheel)
W RL , W RR rear wheel (second drive wheel)
21 Oil tank 29 Relief valve (first relief valve)
30 Friction plate 31 Relief valve (second relief valve)

Claims (1)

エンジン(E)の駆動力を第1駆動輪(WFL,WFR)に伝達する第1動力伝達系(D1 )と、
その第1動力伝達系(D1 )の駆動力を第2駆動輪(WRL,WRR)に伝達する第2動力伝達系(D2 を備えた、四輪駆動車両の動力伝達装置において、
前記第2動力伝達系(D 2 )は、
前記第1動力伝達系(D 1 )と前記第2駆動輪(W RL ,W RR )との間に在って該第1動力伝達系(D 1 )の駆動力を該第2駆動輪(W RL ,W RR )に伝達するプロペラシャフト(S)と、
前記第1動力伝達系(D 1 )から前記第2動力伝達系(D 2 )への駆動力の伝達を制御すべく前記プロペラシャフト(S)と前記第2駆動輪(W RL ,W RR )との間に設けられる油圧クラッチ(C,C L ,C R )と、
その油圧クラッチ(C,C L ,C R )に油圧回路を介して接続されると共に前記プロペラシャフト(S)に駆動されて該プロペラシャフト(S)の回転に応じた油圧を該油圧回路に供給する油圧ポンプ(P)とを備え、
前記油圧回路は、オイルタンク(21)から前記油圧ポンプ(P)に作動油を供給する第1の油路(L1 )と、前記油圧ポンプ(P)から吐出された作動油を前記油圧クラッチ(C,CL ,CR )の作動油室(27)に供給する第2の油路(L2 〜L4 )と、その第2の油路(L 2 〜L 4 )に設けられて前記油圧ポンプ(P)から吐出された作動油を調圧し得るリニアソレノイドバルブ(26)と、前記第2の油路(L2 〜L4 )から分岐して余剰の作動油を前記油圧クラッチ(C,CL ,CR )の摩擦板(30)に導く第3の油路(L6 ,L7 )と、その第3の油路(L6 ,L7 )に介装される第1のリリーフ弁(29)と、その第1のリリーフ弁(29)の下流側で前記第3の油路(L6 ,L7 )から分岐して該第3の油路(L6 ,L7 )を前記オイルタンク(21)に接続する第4の油路(L8 )と、その第4の油路(L8 )に介装される第2のリリーフ弁(31)とを備えていて、車両発進時には前記リニアソレノイドバルブ(26)を制御することにより前記油圧クラッチ(C,C L ,C R )を係合させることを特徴とする、四輪駆動車両の動力伝達装置。
A first power transmission system (D 1 ) for transmitting the driving force of the engine (E) to the first drive wheels (W FL , W FR );
A first power transmission system for driving force (D 1) second drive wheels (W RL, W RR) second power transmission system for transmitting the (D 2) and equipped with a power transmission system for a four wheel drive vehicle In
The second power transmission system (D 2 )
Between the first power transmission system (D 1 ) and the second drive wheels (W RL , W RR ), the driving force of the first power transmission system (D 1 ) is transferred to the second drive wheels ( Propeller shaft (S) that transmits to W RL , W RR ),
The propeller shaft (S) and the second drive wheels (W RL , W RR ) to control the transmission of driving force from the first power transmission system (D 1 ) to the second power transmission system (D 2 ). Hydraulic clutches (C, C L , C R ) provided between
The hydraulic clutches (C, C L , C R ) are connected via a hydraulic circuit and driven by the propeller shaft (S) to supply the hydraulic pressure according to the rotation of the propeller shaft (S) to the hydraulic circuit. A hydraulic pump (P)
The hydraulic circuit includes an oil tank (21) first oil passage for supplying hydraulic fluid to said hydraulic pump (P) and a (L 1), the hydraulic clutch hydraulic oil discharged from the hydraulic pump (P) (C, C L, C R ) the second oil passage for supplying the hydraulic oil chamber (27) and (L 2 ~L 4), provided in the second oil passage that (L 2 ~L 4) the hydraulic pump linear solenoid valve which can by regulating the hydraulic oil discharged from the (P) (26), said second oil passage (L 2 ~L 4) branched surplus hydraulic fluid the hydraulic clutch from ( C, C L , C R ) third oil passages (L 6 , L 7 ) leading to the friction plate (30), and a first oil passage interposed between the third oil passages (L 6 , L 7 ). of the relief valve (29), a first of said third oil passage on the downstream side of the relief valve (29) (L 6, L 7) the oil passage of the third branches from (L 6, L 7 The comprise the fourth oil passage to be connected to the oil tank (21) and (L 8), a second relief valve which is interposed in the fourth oil passage (L 8) and (31), A power transmission device for a four-wheel drive vehicle, wherein the hydraulic clutch (C, C L , C R ) is engaged by controlling the linear solenoid valve (26) when the vehicle starts .
JP22828695A 1995-09-05 1995-09-05 Power transmission device for four-wheel drive vehicle Expired - Fee Related JP3715001B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22828695A JP3715001B2 (en) 1995-09-05 1995-09-05 Power transmission device for four-wheel drive vehicle

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Application Number Priority Date Filing Date Title
JP22828695A JP3715001B2 (en) 1995-09-05 1995-09-05 Power transmission device for four-wheel drive vehicle

Related Child Applications (1)

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JP3715001B2 true JP3715001B2 (en) 2005-11-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009129280A2 (en) * 2008-04-17 2009-10-22 American Axle & Manufacturing, Inc. Electrohydraulic torque transfer device and temperature control system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8083041B2 (en) 2005-08-11 2011-12-27 American Axle & Manufacturing, Inc. Electrohydraulic torque transfer device
US7743899B2 (en) 2005-08-11 2010-06-29 American Axle & Manufacturing, Inc. Electrohydraulic torque transfer device and control system
US7925405B2 (en) 2006-08-21 2011-04-12 GM Global Technology Operations LLC Torque distribution system with electronic power take-off module

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009129280A2 (en) * 2008-04-17 2009-10-22 American Axle & Manufacturing, Inc. Electrohydraulic torque transfer device and temperature control system
WO2009129280A3 (en) * 2008-04-17 2010-01-28 American Axle & Manufacturing, Inc. Electrohydraulic torque transfer device and temperature control system
KR101522062B1 (en) * 2008-04-17 2015-05-20 아메리칸 액슬 앤드 매뉴팩쳐링, 인코포레이티드 Electrohydraulic torque transfer device and temperature control system

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