JPH0527414U - Cooling circuit for automatic transmission - Google Patents
Cooling circuit for automatic transmissionInfo
- Publication number
- JPH0527414U JPH0527414U JP7748791U JP7748791U JPH0527414U JP H0527414 U JPH0527414 U JP H0527414U JP 7748791 U JP7748791 U JP 7748791U JP 7748791 U JP7748791 U JP 7748791U JP H0527414 U JPH0527414 U JP H0527414U
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- Prior art keywords
- cooler
- automatic transmission
- oil
- passage
- working fluid
- Prior art date
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Abstract
(57)【要約】
［目的］自動変速機７のオイルをラジエータ８とクーラ
９とによって冷却し、かつクーラ９が車両前側側方部に
位置する冷却回路において、冷却能力を確保しつつクー
ラ９により自動変速機７内の油圧が低下して自動変速機
７の摩擦要素が焼付くことを防止する。
［構成］バイパス通路１２は、クーラ９及びラジエータ
８の間と前記クーラ９及び自動変速機７の間とをバイパ
スする。クーラ９近傍のオイルの圧力が所定圧力以上に
なった時に、油圧スイッチ１４の信号によって三方ソレ
ノイド弁１３がオイルの通路を循環通路１１からバイパ
ス通路１２に切換える。
(57) [Summary] [Purpose] The oil of the automatic transmission 7 is cooled by the radiator 8 and the cooler 9, and in the cooling circuit in which the cooler 9 is located on the side of the front side of the vehicle, the cooler 9 is secured while ensuring the cooling capacity. As a result, the hydraulic pressure in the automatic transmission 7 is prevented from decreasing and the friction element of the automatic transmission 7 is prevented from seizing. [Configuration] The bypass passage 12 bypasses between the cooler 9 and the radiator 8 and between the cooler 9 and the automatic transmission 7. When the oil pressure in the vicinity of the cooler 9 exceeds a predetermined pressure, the three-way solenoid valve 13 switches the oil passage from the circulation passage 11 to the bypass passage 12 by a signal from the hydraulic switch 14.
Description
【０００１】[0001]
本考案は自動変速機の冷却回路に関する。 The present invention relates to a cooling circuit for an automatic transmission.
【０００２】[0002]
一般に、自動変速機の作動流体を、クーラに通して冷却することが知られてい る。また、締結力が必要で冷却能力がそう問われない時等に、自動変速機の変速 要素の締結力を維持するため、クーラをバイパスすることが知られている。例え ば実開昭５５−２４５０３号公報には、トルクコンバータと該トルクコンバータ 内の作動油を冷却するオイルクーラとを管路によって連結するものにおいて、前 記トルクコンバータに締結力が必要で、トルクコンバータ内のオイル温度があま り上昇しないロックアップ時には前記管路のうち、オイルクーラへの管路を閉じ て、バイパス通路を開くバイパス弁によって、オイルをオイルクーラに行かない ようにすることが開示されている。 It is generally known to cool the working fluid of an automatic transmission by passing it through a cooler. Further, it is known to bypass the cooler in order to maintain the fastening force of the transmission elements of the automatic transmission when the fastening force is required and the cooling capacity is not so important. For example, in Japanese Utility Model Publication No. 55-24503, a torque converter and an oil cooler for cooling the working oil in the torque converter are connected by a pipe line, and the torque converter requires a fastening force. It is disclosed that during lock-up when the oil temperature in the converter does not rise so much, one of the above-mentioned pipelines is closed to the oil cooler and a bypass valve that opens the bypass passage prevents oil from going to the oil cooler. Has been done.
【０００３】[0003]
ところで、自動変速機の作動流体を冷却するため、該作動流体をエンジンの冷 却水を冷却するラジエータのロアタンクに通して冷却すると、ラジエータにエン ジンの冷却水と自動変速機の作動流体の両方を通して冷却するため、ラジエータ が大型化してしまう。そこで、自動変速機の作動流体をラジエータ（以下、第１ のクーラという）に加えて別のクーラ（以下、第２のクーラという）にも通して 冷却することにより、第１のクーラの大型化を防止することが知られている。そ して前記第２のクーラの配置場所として、一般に車両前部中央部が考えられるが 、このように車両前部中央部に二つのクーラを配置する場合、後側に配置された 方のクーラは、車両前部から入る風が、前側に配置された方のクーラによって遮 られるので、クーラの冷却性能が悪化する。従って、前記第２のクーラを第１の クーラを避け、車両前部側方部に配置することが考えられる。 By the way, in order to cool the working fluid of the automatic transmission, if the working fluid is cooled by being passed through the lower tank of the radiator that cools the cooling water of the engine, both the cooling water of the engine and the working fluid of the automatic transmission are sent to the radiator. Since it is cooled through the radiator, the radiator becomes large. Therefore, by increasing the working fluid of the automatic transmission by passing it through a radiator (hereinafter referred to as the first cooler) and another cooler (hereinafter referred to as the second cooler), the size of the first cooler is increased. Is known to prevent. The location of the second cooler is generally considered to be in the center of the front of the vehicle. However, when the two coolers are placed in the center of the front of the vehicle as described above, the cooler on the rear side is arranged. The wind that enters from the front of the vehicle is blocked by the cooler arranged on the front side, so the cooling performance of the cooler deteriorates. Therefore, it is conceivable to dispose the second cooler on the side portion of the front part of the vehicle while avoiding the first cooler.
【０００４】 ところが、前記第２のクーラを車両前部側方部に配置すると、車両前部側方部 は衝突時に損傷を受け易いため、この衝突により第２のクーラ及び該第２のクー ラ前後の通路等が変形して作動流体が流れにくくなり、第２のクーラ近傍の作動 流体圧力が上昇し、その結果自動変速機内部の作動流体圧力が低下し、摩擦要素 が滑って焼付きが生じてしまう可能性がある。However, when the second cooler is disposed on the side portion of the vehicle front portion, the side portion of the vehicle front portion is likely to be damaged in a collision, so that the collision causes the second cooler and the second cooler to be damaged. The front and rear passages are deformed to make it difficult for the working fluid to flow, and the working fluid pressure in the vicinity of the second cooler rises. As a result, the working fluid pressure inside the automatic transmission drops, causing the friction element to slip and seizure. It can happen.
【０００５】[0005]
従って、本願の第１請求項に係わる考案は、車両前部中央部近接に配置され、 自動変速機の作動流体を冷却する第１のクーラと、車両前部側方部に配置され、 前記第１のクーラと直列に接続されて前記作動流体を冷却する第２のクーラと、 前記自動変速機と両クーラとを連結して前記作動流体を循環させる循環通路とを 有する自動変速機の冷却回路において、前記第１のクーラ及び第２のクーラの間 の通路と前記第２のクーラ及び自動変速機の間の通路とに接続して第２のクーラ をバイパスするバイパス通路と、前記循環通路内の作動流体の圧力が所定圧力範 囲外になったことを検出する圧力検出手段と、該圧力検出手段により作動流体の 圧力が所定範囲外になった時、前記作動流体の通路を循環通路からバイパス通路 に切換えて作動流体をバイパス通路に流通させる流通手段とを有することにより 、前記課題を解決している。 Therefore, the invention according to the first claim of the present application is arranged in the vicinity of the central part of the front part of the vehicle, and is arranged in the first cooler for cooling the working fluid of the automatic transmission, and the side part of the front part of the vehicle. 1. A cooling circuit for an automatic transmission, comprising: a second cooler connected in series with the first cooler to cool the working fluid; and a circulation passage that connects the automatic transmission and both coolers to circulate the working fluid. A bypass passage connecting the passage between the first cooler and the second cooler and the passage between the second cooler and the automatic transmission to bypass the second cooler; Pressure detecting means for detecting that the pressure of the working fluid is out of the predetermined pressure range, and when the pressure of the working fluid is out of the predetermined range by the pressure detecting means, the working fluid passage is connected from the circulation passage. Operates by switching to bypass passage By having a flow means for flowing the body in the bypass passage, and solve the above problems.
【０００６】[0006]
本考案によれば、作動流体の圧力が所定圧力範囲外になった時に、第１のクー ラ及び第２のクーラの間の通路と前記第２のクーラ及び自動変速機の間の通路と を接続し、第２のクーラをバイパスするので、第１のクーラにより冷却性能を確 保しながら、自動変速機に所定量の作動流体を供給できる。 According to the present invention, when the pressure of the working fluid is out of the predetermined pressure range, the passage between the first cooler and the second cooler and the passage between the second cooler and the automatic transmission are provided. By connecting and bypassing the second cooler, it is possible to supply a predetermined amount of working fluid to the automatic transmission while ensuring the cooling performance by the first cooler.
【０００７】[0007]
以下、本願の考案に係わる実施例を図１乃至図４に基づいて説明する。図１は 本願の考案に係わる冷却回路の概略構成図である。図１において、車両１は左右 及び前方にフレーム２、３、４が位置し、図示しない車室の前部にエンジンルー ム５が画成され、フレーム２、３、４に囲まれたところにはエンジン６、自動変 速機７及び自動変速機７の作動流体であるオイルとエンジン６の冷却水とを冷却 するラジエータ８が配置され、フレーム３外の車両前部側方部には自動変速機７ のオイルを冷却するクーラ９が配置されており、左右にタイヤ１０、１０が配置 される。 An embodiment according to the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a schematic configuration diagram of a cooling circuit according to the present invention. In FIG. 1, a vehicle 1 has frames 2, 3 and 4 located on the left and right sides and a front side, and an engine room 5 is defined in a front portion of a vehicle compartment (not shown) and is surrounded by the frames 2, 3 and 4. Is provided with a radiator 8 for cooling the engine 6, the automatic variable speed transmission 7 and the oil that is the working fluid of the automatic transmission 7 and the cooling water for the engine 6. A cooler 9 for cooling the oil of the machine 7 is arranged, and tires 10 are arranged on the left and right.
【０００８】 そしてエンジンルーム５内には自動変速機７とラジエータ８とクーラ９とを連 結して前記作動流体を循環させる循環通路１１が配置される。また、循環通路１ １の経路上にはクーラ９とラジエータ８との間に位置する循環通路１１及び自動 変速機７の連結部Ａと、クーラ９と自動変速機７との間とに位置する循環通路１ １及び自動変速機７の連結部Ｂとが設けられるとともに、これに加えて連結部Ａ 、Ｂをバイパスするバイパス通路１２が設けられている。この自動変速機７、ラ ジエータ８、クーラ９、循環通路１１、連結部Ａ、連結部Ｂ及びバイパス通路１ ２とで冷却回路Ｃを構成する。In the engine room 5, a circulation passage 11 that connects the automatic transmission 7, the radiator 8 and the cooler 9 to circulate the working fluid is arranged. Further, on the path of the circulation passage 11 is located between the circulation passage 11 located between the cooler 9 and the radiator 8 and the connecting portion A of the automatic transmission 7, and between the cooler 9 and the automatic transmission 7. A circulation passage 11 and a connecting portion B of the automatic transmission 7 are provided, and in addition to this, a bypass passage 12 that bypasses the connecting portions A 1 and B 2 is provided. The automatic transmission 7, the radiator 8, the cooler 9, the circulation passage 11, the connecting portion A, the connecting portion B, and the bypass passage 12 form a cooling circuit C.
【０００９】 またエンジン６は、エンジン本体６ａの前方にラジエータ８を空冷するための 空冷ファン６ｂを有し、自動変速機７は、トルクコンバータ７ａ及び図示しない 複数の歯車等を有する変速装置７ｂを有する。Further, the engine 6 has an air-cooling fan 6b for air-cooling the radiator 8 in front of the engine body 6a, and the automatic transmission 7 has a torque converter 7a and a transmission 7b having a plurality of gears (not shown). Have.
【００１０】 前記連結部Ａは図２の断面図に示されるように、ラジエータ８からのオイルを クーラ９又は連結部Ｂに切換える流通手段である三方ソレノイド弁１３と、オイ ルの油圧が所定値以上になったことを検出する圧力検出手段である油圧スイッチ １４とを有する。この三方ソレノイド弁１３は弁本体である弁体１３ａと、弁体 １３ａを付勢するスプリング１３ｂと、ソレノイド１３ｃとを有する。As shown in the sectional view of FIG. 2, the connecting portion A has a three-way solenoid valve 13 which is a flow means for switching the oil from the radiator 8 to the cooler 9 or the connecting portion B, and the oil pressure of the oil has a predetermined value. It has a hydraulic switch 14 which is a pressure detecting means for detecting the above. The three-way solenoid valve 13 has a valve body 13a which is a valve body, a spring 13b for urging the valve body 13a, and a solenoid 13c.
【００１１】 また、連結部Ｂは図３の断面図に示されるように、自動変速機７内の圧力を保 つ保圧弁１５と、クーラ９から自動変速機７に向かうオイルの逆流を防止するチ ェック弁１６とを有する。これらの弁１５、１６は夫々ボール１５ａ、１６ａと スプリング１５ｂ、１６ｂとを有する。As shown in the sectional view of FIG. 3, the connecting portion B prevents the backflow of oil from the cooler 9 to the pressure holding valve 15 which maintains the pressure in the automatic transmission 7 and from the cooler 9 to the automatic transmission 7. And a check valve 16. These valves 15 and 16 have balls 15a and 16a and springs 15b and 16b, respectively.
【００１２】 更に、本願の考案に係わる電気回路は、図４に示されるように、バッテリー１ ７と、エンジン６の始動時に通電されるイグニッションスイッチ１８と、油圧が 所定値以上になった時に図示しない車室で光るワーニングランプ１９と、自動変 速機７の図示しないオイルパンに取付けられ、該オイルパン内の油量が所定値未 満になったことを感知するレベルセンサ２０、そして三方ソレノイド弁１３と油 圧スイッチ１４とが接続されている。 次に、本願の考案に係わる作動を説明する。Further, as shown in FIG. 4, the electric circuit according to the invention of the present application shows a battery 17, an ignition switch 18 energized at the time of starting the engine 6, and an electric circuit when the hydraulic pressure exceeds a predetermined value. A warning lamp 19 that lights up in the passenger compartment, a level sensor 20 that is attached to an oil pan (not shown) of the automatic speed changer 7, detects that the amount of oil in the oil pan has not reached a predetermined value, and a three-way solenoid The valve 13 and the hydraulic switch 14 are connected. Next, the operation according to the present invention will be described.
【００１３】 まず、通常時のオイルの流動を説明すると、図１に示されるように自動変速機 ７から流出したオイルは、ラジエータ８に流入して冷却される。続いてラジエー タ８から流出した後に連結部Ａを通ってクーラ９に流入し、更に冷却される。そ してクーラ９から流出した後に連結部Ｂを通って自動変速機７に流入する。First, the oil flow during normal operation will be described. As shown in FIG. 1, the oil that has flowed out of the automatic transmission 7 flows into the radiator 8 and is cooled. Then, after flowing out from the radiator 8, it flows into the cooler 9 through the connecting portion A and is further cooled. Then, after flowing out from the cooler 9, it flows into the automatic transmission 7 through the connecting portion B.
【００１４】 即ち、図２に示されるように連結部Ａの三方ソレノイド弁１３は、オイル圧力 が所定値未満であるので通電されず、従ってスプリング１３ｂの付勢力によって 弁体１３ａが図２中左側に示されるように下側に押される。よってラジエータ８ から流出した後に連結部Ａ内に流入したオイルは、循環通路１１を通ってクーラ ９にのみ向かう。That is, as shown in FIG. 2, the three-way solenoid valve 13 of the connecting portion A is not energized because the oil pressure is less than a predetermined value, and therefore the valve body 13a is moved to the left side in FIG. 2 by the biasing force of the spring 13b. Pressed down as shown in. Therefore, the oil that flows out from the radiator 8 and then flows into the connecting portion A goes only to the cooler 9 through the circulation passage 11.
【００１５】 更に、図３に示されるように連結部Ｂの弁１５、１６は、スプリング１５ｂ、 １６ｂがクーラ９からのオイル圧力によって圧縮されて開き、オイルは自動変速 機７に流入する。そして自動変速機７内で分岐して、図示しない各要素に供給さ れる。Further, as shown in FIG. 3, in the valves 15 and 16 of the connecting portion B, the springs 15 b and 16 b are opened by being compressed by the oil pressure from the cooler 9, and the oil flows into the automatic transmission 7. Then, it branches in the automatic transmission 7 and is supplied to each element (not shown).
【００１６】 ところで、図４の電気回路の状態は、エンジン６の始動時にイグニッションス イッチ１８が通電されているが、クーラ９近傍のオイル圧力が所定値未満である ので、油圧スイッチ１４は通電されず、かつオイルパン内の油量が所定値以上で ありレベルセンサ２０からの信号も発信されていないので、ワーニングランプ１ ９は光らず、かつ三方ソレノイド弁１３は、上述のように、連結部Ａ内に流入し たオイルをクーラ９にのみ向かうように切換えられている。By the way, in the state of the electric circuit of FIG. 4, the ignition switch 18 is energized when the engine 6 is started, but since the oil pressure near the cooler 9 is less than a predetermined value, the hydraulic switch 14 is energized. Since the amount of oil in the oil pan is not less than the predetermined value and the signal from the level sensor 20 is not transmitted, the warning lamp 19 does not illuminate, and the three-way solenoid valve 13 is connected to the connecting portion as described above. The oil that has flowed into A is switched to only the cooler 9.
【００１７】 次に衝突時にクーラ９及び該クーラ９前後の循環通路１１等が変形してオイル が流れにくくなり、クーラ９近傍のオイル圧力が所定値以上になった時のオイル の流動を説明すると、図１に示されるように自動変速機７から流出したオイルは 、ラジエータ８に流入して冷却される。続いてラジエータ８から流出した後に連 結部Ａからバイパス通路１２を介して連結部Ｂを通って自動変速機７に流入する 。 即ち、図２に示されるように連結部Ａの三方ソレノイド弁１３は、オイル圧 力が所定値以上であるので、通電され、従ってスプリング１３ｂの付勢力より大 きなソレノイド１３ｃの電磁力によって弁体１３ａが図２中右側に示されるよう に上側に押される。よってラジエータ８から流出した後に連結部Ａ内に流入した オイルは、バイパス通路１２を介して連結部Ｂにのみ向かう。Next, the flow of oil when the cooler 9 and the circulation passages 11 and the like in front of and behind the cooler 9 are deformed to make it difficult for oil to flow and the oil pressure near the cooler 9 exceeds a predetermined value will be described. As shown in FIG. 1, the oil that has flowed out from the automatic transmission 7 flows into the radiator 8 and is cooled. Then, after flowing out from the radiator 8, it flows into the automatic transmission 7 from the connecting portion A through the bypass passage 12 and the connecting portion B. That is, as shown in FIG. 2, the three-way solenoid valve 13 of the connecting portion A is energized because the oil pressure is equal to or higher than a predetermined value, and therefore the valve is actuated by the electromagnetic force of the solenoid 13c larger than the biasing force of the spring 13b. The body 13a is pushed upwards as shown on the right side in FIG. Therefore, the oil that has flowed out of the radiator 8 and then flown into the connecting portion A goes only to the connecting portion B through the bypass passage 12.
【００１８】 更に、図３に示されるように連結部Ｂの保圧弁１５は、連結部Ａからのオイル 圧力により、スプリング１５ｂがオイル圧力によって圧縮されて開き、オイルは 自動変速機７に流入する。そして自動変速機７内で分岐して、図示しない要素に 供給される。また、連結部Ｂのチェック弁１６は、前記のようにオイルが流れに くくなるとクーラ９下流ではオイル圧力が下るため、スプリング１６ｂの付勢力 によって閉じられる。従ってクーラ９からのオイルが連結部Ａや自動変速機７に 流入するのを防止する。Further, as shown in FIG. 3, in the pressure maintaining valve 15 of the connecting portion B, the spring 15b is compressed and opened by the oil pressure from the connecting portion A, and the oil flows into the automatic transmission 7. .. Then, it branches in the automatic transmission 7 and is supplied to an element (not shown). Further, the check valve 16 of the connecting portion B is closed by the urging force of the spring 16b because the oil pressure decreases downstream of the cooler 9 when the oil becomes difficult to flow as described above. Therefore, the oil from the cooler 9 is prevented from flowing into the connecting portion A and the automatic transmission 7.
【００１９】 ところで、図４の電気回路の状態は、エンジン６の始動時にイグニッションス イッチ１８が通電されており、クーラ９近傍のオイル圧力が所定値以上になるこ とによる油圧スイッチ１４の通電及びオイルパン内の油量が所定値未満になるこ とによるレベルセンサ２０の信号の発信の少なくとも一方が行われてワーニング ランプ１９が光り、かつ三方ソレノイド弁１３は上述のように連結部Ａ内に流入 したオイルを連結部Ｂにのみ向かうように切換えられている。By the way, in the state of the electric circuit of FIG. 4, the ignition switch 18 is energized when the engine 6 is started, and the oil pressure in the vicinity of the cooler 9 becomes equal to or higher than a predetermined value. At least one of the signals from the level sensor 20 is transmitted when the amount of oil in the oil pan becomes less than a predetermined value, the warning lamp 19 lights up, and the three-way solenoid valve 13 is connected to the inside of the connecting portion A as described above. It is switched so that the inflowing oil goes only to the connecting portion B.
【００２０】 以上により、クーラ９近傍の作動流体の圧力が所定圧力以上になった時に、ク ーラ９及びラジエータ８の間の通路と前記クーラ９及び自動変速機７の間の通路 とをバイパスするので、ラジエータ８により冷却性能を確保しながら、自動変速 機７に所定量のオイルを供給でき、自動変速機７内のオイル圧力が低下して自動 変速機７内の摩擦要素が焼付くことを防止できる。As described above, when the pressure of the working fluid near the cooler 9 becomes equal to or higher than the predetermined pressure, the passage between the cooler 9 and the radiator 8 and the passage between the cooler 9 and the automatic transmission 7 are bypassed. Therefore, a predetermined amount of oil can be supplied to the automatic transmission 7 while ensuring the cooling performance by the radiator 8, and the oil pressure in the automatic transmission 7 decreases, and the friction elements in the automatic transmission 7 seize. Can be prevented.
【００２１】 なお、本実施例ではクーラ９近傍のオイル圧力が所定値以上になった時にクー ラ９及びラジエータ８の間の通路とクーラ９及び自動変速機７の間の通路とをバ イパスするよう構成したが、クーラ９近傍のオイル圧力が所定値未満になった時 にバイパスするよう構成させてもよく、所定値未満、以上両方でバイパスさせる 機能を持たせることもできる。In this embodiment, the passage between the cooler 9 and the radiator 8 and the passage between the cooler 9 and the automatic transmission 7 are bypassed when the oil pressure near the cooler 9 exceeds a predetermined value. However, the oil pressure in the vicinity of the cooler 9 may be configured to be bypassed when it becomes less than a predetermined value, or it may be provided with the function of bypassing both at or below the predetermined value.
【００２２】[0022]
本考案によれば、第１のクーラにより冷却性能を確保しながら、自動変速機に 所定量の作動流体を供給できるので、作動流体の圧力が低下して自動変速機内の 摩擦要素が焼付くことを防止できる。 According to the present invention, a predetermined amount of working fluid can be supplied to the automatic transmission while ensuring the cooling performance by the first cooler, so that the pressure of the working fluid decreases and the friction element in the automatic transmission seizes. Can be prevented.
【図１】本願の考案に係わる冷却回路の概略構成図であ
る。FIG. 1 is a schematic configuration diagram of a cooling circuit according to the present invention.
【図２】図１の連結部Ａの断面図である。2 is a cross-sectional view of a connecting portion A of FIG.
【図３】図１の連結部Ｂの断面図である。3 is a cross-sectional view of a connecting portion B of FIG.
【図４】本願の考案に係わる電気回路である。FIG. 4 is an electric circuit according to the present invention.
２、３、４…フレーム、５…エンジンルーム、７…自動
変速機、８…ラジエータ、９…クーラ、１１…循環通
路、Ａ、Ｂ…連結部、１２…バイパス通路、１３…三方
ソレノイド弁、１４…油圧スイッチ、１５…保圧弁、１
６…チェック弁、１６ｂ…スプリング、１９…ワーニン
グランプ。2, 3, 4 ... Frame, 5 ... Engine room, 7 ... Automatic transmission, 8 ... Radiator, 9 ... Cooler, 11 ... Circulation passage, A, B ... Connection part, 12 ... Bypass passage, 13 ... Three-way solenoid valve, 14 ... hydraulic switch, 15 ... pressure-holding valve, 1
6 ... Check valve, 16b ... Spring, 19 ... Warning lamp.
Claims (1)
機の作動流体を冷却する第１のクーラと、車両前部側方
部に配置され、前記第１のクーラと直列に接続されて前
記作動流体を冷却する第２のクーラと、前記自動変速機
と両クーラとを連結して前記作動流体を循環させる循環
通路とを有する自動変速機の冷却回路において、前記第
１のクーラ及び第２のクーラの間の通路と前記第２のク
ーラ及び自動変速機の間の通路とに接続して第２のクー
ラをバイパスするバイパス通路と、前記循環通路内の作
動流体の圧力が所定圧力範囲外になったことを検出する
圧力検出手段と、該圧力検出手段により作動流体の圧力
が所定範囲外になった時、前記作動流体の通路を循環通
路からバイパス通路に切換えて作動流体をバイパス通路
に流通させる流通手段とを有することを特徴とする自動
変速機の冷却回路。1. A first cooler arranged near a central portion of a front portion of a vehicle for cooling a working fluid of an automatic transmission, and a first cooler arranged on a side portion of a front portion of the vehicle and connected in series with the first cooler. A cooling circuit for an automatic transmission having a second cooler for cooling the working fluid and a circulation passage for connecting the automatic transmission and both coolers to circulate the working fluid. A bypass passage that connects the passage between the second cooler and the passage between the second cooler and the automatic transmission to bypass the second cooler, and the working fluid in the circulation passage has a predetermined pressure. A pressure detecting means for detecting that the working fluid is out of the range, and when the pressure of the working fluid is out of a predetermined range by the pressure detecting means, the working fluid passage is switched from the circulation passage to the bypass passage to bypass the working fluid. Distribution to distribute to the passage Cooling circuit of an automatic transmission and having a stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7748791U JPH0527414U (en) | 1991-09-26 | 1991-09-26 | Cooling circuit for automatic transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7748791U JPH0527414U (en) | 1991-09-26 | 1991-09-26 | Cooling circuit for automatic transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0527414U true JPH0527414U (en) | 1993-04-09 |
Family
ID=13635346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7748791U Pending JPH0527414U (en) | 1991-09-26 | 1991-09-26 | Cooling circuit for automatic transmission |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0527414U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002266993A (en) * | 2001-03-09 | 2002-09-18 | Jatco Ltd | Hydraulic fluid cooling device for automatic transmission for vehicle |
| JP2006064155A (en) * | 2004-08-30 | 2006-03-09 | Toyota Motor Corp | Heat exchanger structure of automatic transmission |
-
1991
- 1991-09-26 JP JP7748791U patent/JPH0527414U/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002266993A (en) * | 2001-03-09 | 2002-09-18 | Jatco Ltd | Hydraulic fluid cooling device for automatic transmission for vehicle |
| JP2006064155A (en) * | 2004-08-30 | 2006-03-09 | Toyota Motor Corp | Heat exchanger structure of automatic transmission |
| JP4586460B2 (en) * | 2004-08-30 | 2010-11-24 | トヨタ自動車株式会社 | Heat exchanger structure of automatic transmission |
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