JP2010133509A - Hydraulic control circuit of automatic transmission - Google Patents

Hydraulic control circuit of automatic transmission Download PDF

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JP2010133509A
JP2010133509A JP2008310928A JP2008310928A JP2010133509A JP 2010133509 A JP2010133509 A JP 2010133509A JP 2008310928 A JP2008310928 A JP 2008310928A JP 2008310928 A JP2008310928 A JP 2008310928A JP 2010133509 A JP2010133509 A JP 2010133509A
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oil pump
oil
automatic transmission
control circuit
control valve
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JP5262653B2 (en
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Shigeru Ishii
繁 石井
Masaru Sakakibara
賢 榊原
Katsuyoshi Morita
克良 森田
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Nissan Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic control circuit of an automatic transmission, capable of securely avoiding lack of lubrication to a heating element, which may occur when the hydraulic pressure of an oil pump using an engine as a driving source is low or a high hydraulic pressure is required in connecting friction elements. <P>SOLUTION: The hydraulic control circuit of the automatic transmission includes: a first oil pump (1) subjecting the engine to the driving source; an oil path connected to a discharge channel (1b) of this first oil pump (1); and a control valve unit (2) for carrying out fastening of the friction element, releasing and lubrication of the heating element through a control valve. In the hydraulic control circuit of the automatic transmission, a second oil pump (7) which can be driven by a driving source different from the first oil pump (1) is separately provided to connect between the second oil pump (7) and the heating element by a lubricating oil supply channel (8). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、自動変速機の油圧制御回路に関するものであり、とくに、該自動変速機に組み込まれた発熱要素（クラッチ等）への潤滑油の十分な供給を実現しようとするものである。   The present invention relates to a hydraulic control circuit for an automatic transmission, and in particular, to achieve sufficient supply of lubricating oil to a heat generating element (such as a clutch) incorporated in the automatic transmission.

自動変速機にはエンジンの出力軸の回転に帯同して駆動するオイルポンプが配置されており、該オイルポンプからの供給される油圧でもって摩擦要素の締結、解放を行うとともに発熱要素への潤滑油の供給をも行っている。   The automatic transmission is provided with an oil pump that is driven by the rotation of the output shaft of the engine. The frictional element is fastened and released by the hydraulic pressure supplied from the oil pump, and the heating element is lubricated. It also supplies oil.

ところで、従来の自動変速機にあっては、エンジンによって駆動されるオイルポンプの出力が低下した場合に作動油の供給が不足気味になることもあり、これによる自動変速機の作動不良を回避すべく、別途に電動モータを配置し、オイルポンプの出力が低下した場合には該電動モータを作動させて作動油の確実な供給を実施する試みがなされているところ（例えば、特許文献１参照）、とくに、オイルポンプの油圧が低い場合や摩擦要素の締結に必要とされる油圧が高い場合にあっては発熱要素への潤滑油の供給が不足することもあり、この点に関しては未だ改善の余地が残されていた。   By the way, in the conventional automatic transmission, when the output of the oil pump driven by the engine is reduced, the supply of hydraulic oil may be insufficient, thereby avoiding the malfunction of the automatic transmission due to this. Therefore, when an electric motor is separately provided and the output of the oil pump is reduced, an attempt is made to operate the electric motor to reliably supply hydraulic oil (for example, see Patent Document 1). Especially when the oil pump has a low oil pressure or when the oil pressure required to engage the friction element is high, the supply of lubricating oil to the heat generating element may be insufficient. There was room left.

特開２００１-２８０４５８号公報JP 2001-280458 A

本発明の課題は、エンジンを駆動源とするオイルポンプの油圧が低い場合や摩擦要素の締結において高い油圧が必要とされる場合であっても、発熱要素に対する十分な潤滑が実現できる自動変速機の油圧制御回路を提案するところにある。   SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic transmission capable of realizing sufficient lubrication for a heat generating element even when the hydraulic pressure of an oil pump using an engine as a drive source is low or when a high hydraulic pressure is required for fastening a friction element. The hydraulic control circuit is proposed.

本発明は、上記従来の課題を解決するためになされたものであり、エンジンを駆動源とする第１のオイルポンプとは異なる駆動源にて駆動可能な第２のオイルポンプを別途に設け、この第２のオイルポンプと発熱要素との相互間を、潤滑油供給経路にて直接連結するところに特徴を有する。   The present invention has been made to solve the above-described conventional problems, and a second oil pump that can be driven by a drive source different from the first oil pump that uses the engine as a drive source is provided separately. The second oil pump and the heat generating element are characterized in that they are directly connected by a lubricating oil supply path.

第１のオイルポンプによる潤滑油の供給では、発熱要素の潤滑が十分でないと判断される場合には、第２のオイルポンプを駆動して潤滑油を潤滑油供給経路を通して直接発熱要素に供給することができるため潤滑不足をきたすことがない。   When it is determined that the lubricating oil supplied from the first oil pump is not sufficiently lubricated, the second oil pump is driven to supply the lubricating oil directly to the heating element through the lubricating oil supply path. Therefore, there is no lack of lubrication.

以下、図面を用いて本発明の実施の形態（実施例）をより具体的に説明する。
図１は本発明にしたがう油圧制御回路を模式的に示した図である。 Hereinafter, embodiments (examples) of the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a diagram schematically showing a hydraulic control circuit according to the present invention.

図中１はトランスミッションのケース内に組み込まれた第１のオイルポンプである。この第１のオイルポンプ１はエンジンＥの出力軸につながっており、該エンジンＥの始動によって駆動するものであって、その吸引経路１ａはストレーナＳを介してオイルタンクＴにつながっている。   In the figure, reference numeral 1 denotes a first oil pump incorporated in the case of the transmission. The first oil pump 1 is connected to the output shaft of the engine E, and is driven when the engine E is started. The suction path 1a is connected to the oil tank T via the strainer S.

また、２はトランスミッションケース内に配置されたコントロールバルブユニットである。このコントロールバルブユニット２は、第１のオイルポンプ１の吐出経路１ｂにつながりその吐出圧力の制御（元圧の制御）を行うとともに各コントロール弁に必要な油圧を供給するプレッシャーレギュレータ弁２ａと、セカンダリープーリＰの駆動力を制御するセカンダリープーリコントロール弁２ｂと、前進クラッチの締結、解放を行うコントロール弁２ｃ、２ｄと、各種電磁弁２ｅ１〜２ｅ４に油圧を供給し該電磁弁２ｅ１〜２ｅ４の電流指令によって各コントロール弁（セカンダリーコントロール弁２ｂ、前進クラッチコントロール弁２ｃ、２ｄ、プレッシャライン等）の油圧の制御を行うパイロット弁２ｆから構成されている。 Reference numeral 2 denotes a control valve unit disposed in the transmission case. The control valve unit 2 is connected to the discharge path 1b of the first oil pump 1, controls the discharge pressure (control of the original pressure), and supplies a pressure regulator valve 2a for supplying the necessary hydraulic pressure to each control valve, and a secondary and secondary pulley control valve 2b for controlling the driving force of the pulley P, engagement of the forward clutch control valve 2c which performs release, 2d and, various solenoid valves 2e 1 to ～2E 4 to supply the hydraulic pressure the solenoid valve 2e 1 ~2e 4 is constituted by a pilot valve 2f that controls the hydraulic pressure of each control valve (secondary control valve 2b, forward clutch control valves 2c, 2d, pressure line, etc.) by a current command of 4 .

また、３はコントロール弁２ｃによってクラッチの締結、解放を行う前進クラッチ、４はコントロール弁２ｄによってクラッチの締結、解放を行う前進クラッチ（発熱要素）である。前進クラッチ４は、手動レバーの操作により前進に位置させることによりコントロール弁２ｄからセレクトスイッチ弁５、マニュアル弁６を通して前進クラッチ４に油圧を供給してクラッチの締結を行う。   Further, 3 is a forward clutch that engages and disengages the clutch by the control valve 2c, and 4 is a forward clutch (heat generating element) that engages and disengages the clutch by the control valve 2d. The forward clutch 4 is positioned forward by operating a manual lever, thereby supplying hydraulic pressure to the forward clutch 4 from the control valve 2d through the select switch valve 5 and the manual valve 6 to engage the clutch.

さらに、７はトランスミッションのケースの外部に第１のオイルポンプ１とは別途に設けられた第２のオイルポンプである。この第２のオイルポンプ７は、第１のオイルポンプ１とは異なる、例えば電動モータの如きによって駆動する駆動源Ｍを備えており、その吸引経路７ａは第１のオイルポンプ１と同様にオイルタンクＴにつながっている。   Furthermore, 7 is a second oil pump provided separately from the first oil pump 1 outside the transmission case. The second oil pump 7 includes a drive source M that is driven by, for example, an electric motor, which is different from the first oil pump 1, and the suction path 7 a is oil like the first oil pump 1. Connected to tank T.

８は第２のオイルポンプ７と前進クラッチ４とをつなぐ潤滑油供給経路（外部配管等が適用される）、９は第２のオイルポンプ７の吐出経路７ｂと潤滑油供給経路８との間に配置された切替弁である。この切替弁９はコントロールバルブユニット２につながる油路９ａ（パイロット弁２ｆに油圧を供給する油路であってプレッシャーレギュレータ弁２ａによって調整された圧力になる油圧が供給されている）を有している。   8 is a lubricating oil supply path (external piping or the like is applied) that connects the second oil pump 7 and the forward clutch 4, and 9 is between the discharge path 7 b and the lubricating oil supply path 8 of the second oil pump 7. It is the switching valve arrange | positioned in. The switching valve 9 has an oil passage 9a connected to the control valve unit 2 (an oil passage for supplying hydraulic pressure to the pilot valve 2f and supplied with hydraulic pressure adjusted to a pressure adjusted by the pressure regulator valve 2a). Yes.

さらに、１０は第１のオイルポンプ１の吐出経路１ｂと切替弁９との間に配置された油路である。この油路１０には、その圧力変動を検知しその検知結果に基づいて油路９aと潤滑油供給経路８とを適宜切り替える制御手段を設けることができるが、油路１０の圧力変動に応じて切替弁９の弁体を作動させて油路９ａと潤滑油供給経路８とを切り替えるようにしてもよい。   Further, 10 is an oil passage disposed between the discharge passage 1 b of the first oil pump 1 and the switching valve 9. The oil passage 10 can be provided with a control means for detecting the pressure fluctuation and appropriately switching between the oil passage 9a and the lubricating oil supply path 8 based on the detection result. You may make it switch the oil path 9a and the lubricating oil supply path 8 by operating the valve body of the switching valve 9. FIG.

車両の発進時あるいは登坂低速時においては、セカンダリープーリＰへの駆動油圧を高めるべく第１のオイルポンプ１を高圧にして作動させるため、これによりマイクロスリップをする前進クラッチ４では潤滑油の供給が不十分となって焼き付きを起こすことが懸念されるが、この場合、制御手段による切替弁９の切替により第２のオイルポンプ７の吐出経路７ｂと潤滑油供給経路８とが連通され前進クラッチ４に十分な潤滑油が供給される。   When the vehicle starts or at a low climbing speed, the first oil pump 1 is operated at a high pressure in order to increase the drive hydraulic pressure to the secondary pulley P. Thus, the forward clutch 4 that performs microslip is supplied with lubricating oil. Although there is a concern that seizure may occur due to insufficiency, the forward passage clutch 4 is connected to the discharge path 7b of the second oil pump 7 and the lubricating oil supply path 8 by switching the switching valve 9 by the control means. Sufficient lubricating oil is supplied.

前進クラッチ４への潤滑油の供給に際しては第２のオイルポンプ７は低圧で作動させることが可能であり、潤滑に供した油はオイルタンクＴに返送される。また、前進クラッチ４はコントロールバルブユニット２側において制御され、マイクロスリップ発進においては電磁弁によりコントロール弁２ｄを低圧にして制御される。   When the lubricating oil is supplied to the forward clutch 4, the second oil pump 7 can be operated at a low pressure, and the oil used for lubrication is returned to the oil tank T. The forward clutch 4 is controlled on the control valve unit 2 side, and the microslip start is controlled by setting the control valve 2d to a low pressure by an electromagnetic valve.

車両が中速、高速走行状態にある場合には、セカンダリープーリＰの駆動力を制御するセカンダリーコントロール弁２ｂは前進クラッチコントロール弁２ｃ、２ｄよりも低い圧力で制御される（第１のオイルポンプ１は低圧作動）ため前進クラッチ３、４においては作動油圧が不足してクラッチの締結力が小さくなるが、この場合にはコントロールバルブユニット２のプレッシャーレギュレータ弁２ａの圧力が低くなった時点において制御手段により切替弁９の切替を行う。この切替は、第２のオイルポンプ７の吐出経路７ｂと油路９ａとを連通させる切替であり、これによりパイロット弁２ｆに油圧が供給され、電磁弁の制御により前進クラッチコントロール弁２ｃ、２ｄが前進クラッチ３、４の締結力を満たす圧力を供給すとともに必要油量が確保される。   When the vehicle is in a medium speed and high speed running state, the secondary control valve 2b for controlling the driving force of the secondary pulley P is controlled at a pressure lower than the forward clutch control valves 2c and 2d (first oil pump 1 Therefore, the forward clutches 3 and 4 have insufficient hydraulic pressure and the clutch engagement force becomes small. In this case, the control means when the pressure of the pressure regulator valve 2a of the control valve unit 2 decreases. Thus, the switching valve 9 is switched. This switching is a switching for connecting the discharge path 7b of the second oil pump 7 and the oil path 9a, whereby hydraulic pressure is supplied to the pilot valve 2f, and the forward clutch control valves 2c and 2d are controlled by the electromagnetic valve. A pressure that satisfies the engagement force of the forward clutches 3 and 4 is supplied, and a necessary oil amount is secured.

図２に本発明にしたがう潤滑用油圧制御回路に好適な制御フローチャートを示す。第２のオイルポンプ７により油圧を供給するに当たっては、車両が発進、登坂状態（低速）あるいは中速、高速走行にあるかどうかを判断して上記の要領で切替弁９の切替を行えばよい。   FIG. 2 shows a control flow chart suitable for the lubricating hydraulic control circuit according to the present invention. In supplying the hydraulic pressure by the second oil pump 7, it is only necessary to determine whether the vehicle is in a starting, climbing state (low speed), medium speed, or high speed driving and switching the switching valve 9 as described above. .

前進クラッチ４への潤滑油の供給に際しては第２のオイルポンプ７は低圧で作動させることができるため、第２のオイルポンプ７を駆動する駆動源の負荷を低減することが可能であり燃費の改善効果が期待できる。   When the lubricating oil is supplied to the forward clutch 4, the second oil pump 7 can be operated at a low pressure. Therefore, it is possible to reduce the load of the drive source that drives the second oil pump 7, and to improve the fuel efficiency. An improvement effect can be expected.

また、中速、高速走行では、第１のオイルポンプ１の吐出圧力を下げることによりコントロールバルブユニット２のセカンダリープーリコントロール弁２ｂの圧力を適度に低下させることが可能となり、セカンダリープーリＰのフリクションを大幅に低減して燃費の改善が可能となるとともに第１のオイルポンプ１の負荷の軽減を図ることができる。   Further, in medium and high speed running, it is possible to moderately reduce the pressure of the secondary pulley control valve 2b of the control valve unit 2 by reducing the discharge pressure of the first oil pump 1, and the friction of the secondary pulley P can be reduced. It is possible to significantly reduce the fuel consumption and to reduce the load on the first oil pump 1.

エンジンを駆動源とするオイルポンプの油圧が低い場合や摩擦要素の締結において高い油圧が必要とされる場合に起こることが懸念された発熱要素に対する潤滑不足を確実に回避できる自動変速機の油圧制御回路が提供できる。   Hydraulic control of an automatic transmission that can reliably avoid insufficient lubrication for a heat generating element that is a concern when the oil pressure of an oil pump that uses an engine as a drive source is low or when high oil pressure is required to engage a friction element A circuit can be provided.

本発明にしたがう自動変速機の油圧制御回路の実施形態を示した図である。It is the figure which showed embodiment of the hydraulic control circuit of the automatic transmission according to this invention. 本発明にしたがう自動変速機の油圧制御回路を用いて制御を行う場合のフローチャートを示した図である。It is the figure in the case of performing control using the hydraulic control circuit of the automatic transmission according to the present invention.

符号の説明Explanation of symbols

１ 第１のオイルポンプ
１ａ 吸引経路
１ｂ 吐出経路
２ コントロールバルブユニット
２ａ プレッシャーレギュレータ
２ｂ セカンダリープーリコントロール弁
２ｃ 前進クラッチコントロール弁
２ｄ 前進クラッチコントロール弁
２ｅ１〜２ｅ４ 電磁弁
２ｆ パイロット弁
３ 前進クラッチ
４ 前進クラッチ
５ セレクトスイッチ
６ マニュアル弁
７ 第２のオイルポンプ
７ａ 吸引経路
７ｂ 吐出経路
８ 潤滑油供給経路
９ 切替弁
９ａ 油路
１０ 油路
Ｓ ストレーナ
Ｔ オイルタンク
Ｐ セカンダリープーリ 1 first oil pump 1a suction passage 1b discharge passage 2 control valve unit 2a pressure regulator 2b secondary pulley control valve 2c forward clutch control valve 2d forward clutch control valve 2e 1 ～2E 4 solenoid valve 2f pilot valve 3 forward clutch 4 forward clutch 5 Select switch 6 Manual valve 7 Second oil pump 7a Suction path 7b Discharge path 8 Lubricating oil supply path 9 Switching valve 9a Oil path 10 Oil path S Strainer T Oil tank P Secondary pulley

Claims (3)

エンジンを駆動源とする第１のオイルポンプと、この第１のオイルポンプの吐出経路につながる油路を有し、摩擦要素の締結、解放、発熱要素の潤滑をコントロール弁を通して行うコントロールバルブユニットとを備え、
前記第１のオイルポンプとは異なる駆動源にて駆動可能な第２のオイルポンプを別途に設け、この第２のオイルポンプと発熱要素との相互間を、潤滑油供給経路にて連結したことを特徴とする、自動変速機の油圧制御回路。 A first oil pump having an engine as a drive source, and a control valve unit having an oil passage connected to a discharge path of the first oil pump, and fastening and releasing the friction element and lubricating the heat generating element through the control valve; With
A second oil pump that can be driven by a drive source different from that of the first oil pump is separately provided, and the second oil pump and the heat generating element are connected to each other through a lubricating oil supply path. A hydraulic control circuit for an automatic transmission. 前記第２のオイルポンプの吐出経路に、潤滑油供給油路とコントロールバルブユニットとの交互切替を可能とした切替弁を設け、
前記切替弁は、摩擦要素へ供給する作動油圧が不足した場合に第２のオイルポンプとコントロールバルブユニットにつながる油路を連通させる一方、発熱要素へ供給する潤滑油が不足した場合に第２のオイルポンプと潤滑油供給油路を連通させる制御手段を有する、請求項１記載の自動変速機の油圧制御回路。 In the discharge path of the second oil pump, there is provided a switching valve capable of alternately switching between the lubricating oil supply oil path and the control valve unit,
The switching valve communicates an oil passage connected to the second oil pump and the control valve unit when the hydraulic pressure supplied to the friction element is insufficient, while the second valve is connected when the lubricating oil supplied to the heat generating element is insufficient. 2. The hydraulic control circuit for an automatic transmission according to claim 1, further comprising control means for communicating the oil pump and the lubricating oil supply oil passage. 前記切替弁は、第１のオイルポンプの吐出経路における油圧によって制御されるものである、請求項１又は２記載の自動変速機の油圧制御回路。   The hydraulic control circuit for an automatic transmission according to claim 1 or 2, wherein the switching valve is controlled by a hydraulic pressure in a discharge path of the first oil pump.
JP2008310928A 2008-12-05 2008-12-05 Hydraulic control circuit for automatic transmission Expired - Fee Related JP5262653B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101566728B1 (en) 2013-12-18 2015-11-06 현대자동차 주식회사 Oil pressure supply system of automatic transmission
JP2016056838A (en) * 2014-09-08 2016-04-21 いすゞ自動車株式会社 Vehicular hydraulic circuit

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KR102417342B1 (en) 2017-10-19 2022-07-05 현대자동차 주식회사 Oil pressure supply system of automatic transmission
KR102451903B1 (en) 2017-12-28 2022-10-06 현대자동차 주식회사 Oil pressure supply system of automatic transmission

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KR101566728B1 (en) 2013-12-18 2015-11-06 현대자동차 주식회사 Oil pressure supply system of automatic transmission
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JP2016056838A (en) * 2014-09-08 2016-04-21 いすゞ自動車株式会社 Vehicular hydraulic circuit

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