JPS60256651A - Oil pressure controlling device for automatic transmission - Google Patents

Oil pressure controlling device for automatic transmission

Info

Publication number
JPS60256651A
JPS60256651A JP10965584A JP10965584A JPS60256651A JP S60256651 A JPS60256651 A JP S60256651A JP 10965584 A JP10965584 A JP 10965584A JP 10965584 A JP10965584 A JP 10965584A JP S60256651 A JPS60256651 A JP S60256651A
Authority
JP
Japan
Prior art keywords
hydraulic
shift rod
oil pressure
switching valve
shift
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.)
Granted
Application number
JP10965584A
Other languages
Japanese (ja)
Other versions
JPH0670463B2 (en
Inventor
Shoichi Iijima
飯島 正一
Izumi Takagi
泉 高木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Isuzu Motors Ltd
Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Isuzu Motors Ltd
Kawasaki Heavy Industries Ltd
Kawasaki Jukogyo KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Isuzu Motors Ltd, Kawasaki Heavy Industries Ltd, Kawasaki Jukogyo KK filed Critical Isuzu Motors Ltd
Priority to JP59109655A priority Critical patent/JPH0670463B2/en
Publication of JPS60256651A publication Critical patent/JPS60256651A/en
Publication of JPH0670463B2 publication Critical patent/JPH0670463B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Fluid-Pressure Circuits (AREA)
  • Gear-Shifting Mechanisms (AREA)
  • Control Of Transmission Device (AREA)

Abstract

PURPOSE:To prevent a shift rod from overtraveling when it is returned from the shift position of a forwarding gears which are combined with a backing gear, to a neutral position, by opening an always-closed type erroneous-operation preventing valve by means of oil pressure via a solenoid selector valve. CONSTITUTION:The captioned device consists of a shift rod 56 which attains the meshing of gears with a backing stage or a certain forwarding stage, oil pressure actuators 41-43 which are connected to the shift rod 56, solenoid selector valves 31-36 which are inserted and connected between the oil pressure source and one end chamber of each of the oil pressure actuators 41-43, and which make the shift rod 56 shift to the forwarding stages, and an always-closed type erroneous-operation preventing valve 71 which is connected between the oil pressure source and the other end chamber of each of the oil pressure actuators 41- 43 in series. This always-closed erroneous-operation preventing valve 71 can be opened by oil pressure which is applied to its via the solenoid selector valves 31-36, to prevent the overreturn of the shift rod 56.

Description

【発明の詳細な説明】 [発明の目的] 本発明は車両の自動変速機の油圧制御装置に関するもの
である。
DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a hydraulic control device for an automatic transmission of a vehicle.

機関の負荷、回転数および車速などの入力信号に基づく
マイクロコンピュータの出力により自動的に油圧回路を
制御し、この油圧回路によってクラッチ機構とともにシ
フトロッドを駆動する油圧アクチュエータを作動させる
ようにした自動変速機は、例えば特開昭54−9665
9号公報などに既に提案されている。
An automatic shift system in which a hydraulic circuit is automatically controlled by the output of a microcomputer based on input signals such as engine load, rotational speed, and vehicle speed, and this hydraulic circuit operates a hydraulic actuator that drives a clutch mechanism and a shift rod. The machine is, for example, Japanese Patent Application Laid-Open No. 54-9665.
This has already been proposed in Publication No. 9, etc.

しかし、従来の自動変速機では、万一電気的な故障が生
じた場合に、電磁切換弁が誤動作を生じ、次のような不
規則な変速動作が行なわれる恐れがある。すなわち、一
般的な歯車変速機において共通のシフトロッドにより後
進段と1速段または所定の前進段との変速がなされるよ
うに構成され、前記シフトロッドが3位置動作油圧アク
チュエータによって操作されるようになっており、1速
段へのシフト状態から2速段ヘシフトアップされる場合
に、まず前記シフトロッドが]速段から中立位置へ戻さ
れるのであるが、たまたま後進段・1速段用シフトOツ
ドを動作させる油圧アクチュエータの油圧回路を制御す
る1対の電磁切換弁の一方または両方が故障し、油圧ア
クチュエータの一方の端室への圧油の供給が断たれると
、シフトロラドが中立位置を超えて後進段ヘシフトされ
、急激に車両が後退するという危険がある。
However, in conventional automatic transmissions, in the unlikely event that an electrical failure occurs, the electromagnetic switching valve may malfunction, resulting in irregular gear shifting operations as described below. That is, in a general gear transmission, a common shift rod is used to shift between a reverse gear and a first gear or a predetermined forward gear, and the shift rod is operated by a three-position hydraulic actuator. When shifting up from 1st gear to 2nd gear, the shift rod is first returned from the 1st gear to the neutral position, but it happens that the shift for reverse gear/1st gear If one or both of the pair of electromagnetic switching valves that control the hydraulic circuit of the hydraulic actuator that operates the Otsudo malfunctions and the supply of pressure oil to one end chamber of the hydraulic actuator is cut off, the shift roller will move to the neutral position. There is a danger that the vehicle will be shifted into reverse gear beyond this point and the vehicle will suddenly move backwards.

したがって、本発明の目的は上述の問題に鑑み、後進段
と組合される前進段のシフト位置からシフトロッドを中
立位置へ戻す場合に、後進段への行き過ぎを防止し得る
自動変速機の油圧制御回路を提供することにある。
Therefore, in view of the above-mentioned problems, an object of the present invention is to provide hydraulic control for an automatic transmission that can prevent over-shifting to reverse gear when returning the shift rod from the shift position of forward gear combined with reverse gear to the neutral position. The purpose is to provide circuits.

[発明の構成] 上記目的を達成するために、本発明の構成は後進段と所
定の前進段との歯車の噛合いを達成するシフトロッドと
、該シフトロッドに連結した油圧アクチュエータと、油
圧源と前記油圧アクチュエータの一方の端室との間に挿
入接続されかつ前記シフトロッドを所定の前進段ヘシフ
トさせるための電磁切換弁と、前記油圧源と前記油圧ア
クチュエータの他方の端室との間に直列に接続した常閉
型誤動作防止弁とからなり、前記常閉型誤動作防ψ 止弁が前記電磁切換弁を経て加えられる油圧によって開
かれるようにし、これによりシフトロッドの戻り過ぎな
いし行き過ぎを防止するようにしたものである。
[Configuration of the Invention] In order to achieve the above object, the configuration of the present invention includes a shift rod that achieves gear meshing between a reverse gear and a predetermined forward gear, a hydraulic actuator connected to the shift rod, and a hydraulic power source. and an electromagnetic switching valve inserted and connected between the hydraulic power source and one end chamber of the hydraulic actuator and for shifting the shift rod to a predetermined forward gear, and between the hydraulic power source and the other end chamber of the hydraulic actuator. It consists of a normally closed malfunction prevention valve connected in series, and the normally closed malfunction prevention valve is opened by hydraulic pressure applied via the electromagnetic switching valve, thereby preventing the shift rod from returning too far or going too far. It was designed to do so.

本発明を実施例に基づいて説明する。第1図に示すよう
に、油圧源12とシフトロッドを駆動する油圧制御回路
Bとの間に、油圧切換弁A′/fi挿入接続される。こ
の油圧切換弁Aはハウジング3の弁室16にスプール2
を嵌合して構成ぎれ、このスプール2の端部に設けた穴
2aに図示してないセレクタレバーが連結され、P、R
,N、D、2゜しレンジ(運転モード)の切換えを行う
セレクタレバーをD−N−Rレンジへ切換える時作動さ
れるようになっている。スブ〜ル2を所定のレンジに保
持するために、ハウジング3に設けた円筒部にばね4に
よってスプール2のくぼみ7へ付勢されるボール6が保
持される。弁室16には油圧源12に接続する入hボ〜
ト8,18と、油圧制御回路已に接続する出力ポート1
5と常時タンク17に接続するボート13.14と、ボ
ート18と相対向して耐酸される19とが備えられる。
The present invention will be explained based on examples. As shown in FIG. 1, a hydraulic switching valve A'/fi is inserted and connected between a hydraulic power source 12 and a hydraulic control circuit B that drives a shift rod. This hydraulic switching valve A has a spool 2 in the valve chamber 16 of the housing 3.
A selector lever (not shown) is connected to the hole 2a provided at the end of the spool 2, and the P, R
, N, D, 2 degrees and is activated when the selector lever for changing the range (operation mode) is changed to the D-NR range. In order to maintain the spool 2 in a predetermined range, a ball 6 is held in a cylindrical portion provided in the housing 3 and is urged by a spring 4 into a recess 7 of the spool 2. The valve chamber 16 has an input port connected to the hydraulic power source 12.
ports 8 and 18, and output port 1 connected to the hydraulic control circuit.
5, a boat 13, 14 which is constantly connected to the tank 17, and an acid-resistant boat 19 facing the boat 18.

一方、 、、l。On the other hand, ,,l.

スプール2には環状溝11.10.9が備えられ、環状
溝11はディテント機構5のボール6にスプール2の右
側のくぼみ7が係合するRレンジでボート18をボート
19に接続するようになっている。また、環状溝9はボ
ール6にスプール2の左側のくぼみ7が係合するDレン
ジでボート8をボート15に接続するようになっている
。さらに、スプール2には軸方向の通路23と、これに
連なる径方向の通路24とが備えられており、スプール
2が図示のNレンジにある時ポート19が通路24.2
3および弁室16の左端室25を経てボート13と接続
される。
The spool 2 is provided with an annular groove 11.10.9, which connects the boat 18 to the boat 19 in the R range where the right-hand recess 7 of the spool 2 engages the ball 6 of the detent mechanism 5. It has become. The annular groove 9 also connects the boat 8 to the boat 15 in the D range where the ball 6 engages with the recess 7 on the left side of the spool 2. Further, the spool 2 is provided with an axial passage 23 and a radial passage 24 connected thereto, and when the spool 2 is in the N range shown, the port 19 is in the passage 24.2.
3 and the left end chamber 25 of the valve chamber 16 .

油圧制御回路Bは6個の電磁切換弁31〜36から構成
される。各電磁切換弁31〜36はソレノイド31a〜
36aの消磁時は図示の状態にあり、ソレノイド31a
〜36aの励磁時は図示の状態から切換わり、かつボー
ト15に連なる通路22からのパイロット圧がスプール
に作用するようになっている。
The hydraulic control circuit B is composed of six electromagnetic switching valves 31 to 36. Each electromagnetic switching valve 31 to 36 is a solenoid 31a to
When the solenoid 36a is demagnetized, it is in the state shown in the figure, and the solenoid 31a
36a is switched from the illustrated state, and the pilot pressure from the passage 22 connected to the boat 15 acts on the spool.

油圧アクチュチェータCは4速段と5速段の変速を得る
シフトロッド54を駆動する油圧アクチュエータ41と
、2速段と3速段の変速を得るシフトロッド55を駆動
する油圧アクチュエータ42と、後進段と1速段の変速
を得るシフトロッド56を駆動する油圧アクチュエータ
43とから構成される。各油圧アクチュエータ41.4
2.43は全く同様の構成をなすものであるので、油圧
アクチュエータ41の場合だけについて説明する。
The hydraulic actuator C includes a hydraulic actuator 41 that drives a shift rod 54 that changes between the 4th and 5th speeds, and a hydraulic actuator 42 that drives a shift rod 55 that changes between the 2nd and 3rd speeds. It is composed of a hydraulic actuator 43 that drives a shift rod 56 that changes between reverse gear and first gear. Each hydraulic actuator 41.4
2.43 has a completely similar configuration, so only the case of the hydraulic actuator 41 will be described.

3位置動作をする油圧アクチュエータ41は小径シリン
ダ58に小径ピストン59が、大径シリンダ62に円筒
形の大径シリンダ61がそれぞれ嵌合される。また、大
径ピストン61に中間ピストン60が嵌合され、かつ小
径ピストン59と衝合されるかまたは一体に形成される
。小径ピストン59がシフトロッド54と結合される。
In the hydraulic actuator 41 that operates in three positions, a small-diameter piston 59 is fitted into a small-diameter cylinder 58, and a cylindrical large-diameter cylinder 61 is fitted into a large-diameter cylinder 62, respectively. Further, an intermediate piston 60 is fitted into the large diameter piston 61 and is abutted against or integrally formed with the small diameter piston 59. A small diameter piston 59 is coupled to the shift rod 54.

そして、油圧源12から圧油が小径シリンダ5日の端室
57と大径シリンダ62の端室63の両方へ供給される
と、図示の中立位置に保持される。なお、図示してない
が、ピストン61と59が互いに離れると両者の間に生
じる中間室はタンク17に常時接続される。
Then, when pressure oil is supplied from the hydraulic source 12 to both the end chamber 57 of the small diameter cylinder 5 and the end chamber 63 of the large diameter cylinder 62, the cylinder is held at the neutral position shown. Although not shown, when the pistons 61 and 59 are separated from each other, an intermediate chamber created between them is always connected to the tank 17.

各油圧アクチュエータ41〜43の各端室57゜63を
油圧?1i12またはタンク17へ接続するために、各
端室に電磁切換弁が接続される。すなわち、油圧アクチ
ュエータ41の場合についてiJ[fれば、油圧源12
に連なる通路22がら電磁切換弁31を経て大径シリン
ダ62へ圧油が送られるかまたは大径シリンダ62の油
がタンク17に連なる通路21へ戻される。また、通路
22から電磁切換弁32を経て小径シリンダ58へ圧油
が送られるかまたは小径シリンダ58の油が通路21へ
戻される。各電磁切換弁31.32は戻しばね31b、
32bの力によって通常は図示の状態にあって端室57
,63をタンク17へ接続しており、励磁されると戻し
ばね31b゛、32bの力に抗してスプールが移動され
、端室57,63を油圧源12へ接続するように構成さ
れる。
Each end chamber 57°63 of each hydraulic actuator 41-43 is hydraulically operated? A solenoid switching valve is connected to each end chamber for connection to 1i12 or tank 17. That is, in the case of the hydraulic actuator 41, if iJ[f, the hydraulic source 12
Pressure oil is sent to the large-diameter cylinder 62 from the passage 22 connected to the tank 17 via the electromagnetic switching valve 31, or the oil in the large-diameter cylinder 62 is returned to the passage 21 connected to the tank 17. Further, pressure oil is sent from the passage 22 to the small diameter cylinder 58 via the electromagnetic switching valve 32, or oil from the small diameter cylinder 58 is returned to the passage 21. Each electromagnetic switching valve 31, 32 has a return spring 31b,
The force 32b causes the end chamber 57 to be normally in the state shown.
, 63 are connected to the tank 17, and when energized, the spool is moved against the force of the return springs 31b, 32b, thereby connecting the end chambers 57, 63 to the hydraulic source 12.

本発明によれば、後進段と組合される変速段(図示の実
施例では1速段)のシフトロッド561 を駆動する油
圧アクチュエータ43の回路に誤動作防止弁71が挿入
接続される。この誤動作防止弁71はハウジング72に
段付シリンダ73を備えており、これに段付ピストン7
7が嵌合され、ばね78によって大径シリンダ側へ付勢
されている。そして、小径シリンダにボート79が設け
られ、電磁切換弁36と接続される。また、大径シリン
ダに相対向するボート74.76が設けられる。ボート
74は電磁切換弁35に接続され、ボート76は油圧ア
クユエータ43の大径シリンダ62(後進段へのシフト
を得る油圧作動室となる)に接続される。段付ピストン
77に環状溝75が設けられ、これによって段付ピスト
ン77がばね78に抗して左方へ移動すると、ボート7
4と76が接続されるようになっている。なお、段付シ
リンダ73の中間室は常時タンク17に接続される。
According to the present invention, the malfunction prevention valve 71 is inserted and connected to the circuit of the hydraulic actuator 43 that drives the shift rod 561 of the gear stage (first gear in the illustrated embodiment) that is combined with the reverse gear. This malfunction prevention valve 71 is equipped with a stepped cylinder 73 in a housing 72, and a stepped piston 73 is attached to the stepped cylinder 73.
7 is fitted and is urged toward the large diameter cylinder by a spring 78. A boat 79 is provided on the small diameter cylinder and connected to the electromagnetic switching valve 36. Also provided are boats 74, 76 facing the large diameter cylinder. The boat 74 is connected to the electromagnetic switching valve 35, and the boat 76 is connected to the large diameter cylinder 62 of the hydraulic actuator 43 (which serves as a hydraulic chamber for shifting to reverse gear). An annular groove 75 is provided in the stepped piston 77, so that when the stepped piston 77 moves to the left against the spring 78, the boat 7
4 and 76 are connected. Note that the intermediate chamber of the stepped cylinder 73 is always connected to the tank 17.

なお、上述の実施例では油圧により作動する制御装置に
ついて説明したが、本発明はこれに限定されるものでな
く、油圧の代りに空気圧などの流体圧を使用することが
できることはいうまでもな 、、(い。
Although the above-mentioned embodiment describes a control device operated by hydraulic pressure, the present invention is not limited to this, and it goes without saying that fluid pressure such as air pressure can be used instead of hydraulic pressure. ,,(stomach.

次に、本発明装置の作動について説明する。通常の走行
すなわちセレクタレバーがDレンジとされると、第2図
に示すように、油圧切換弁Aのスプール2の左側のくぼ
み7がディテント機構5のボール6に係合される。この
時、油圧源12からボート8、環状溝9およびボート1
5を経て通路22に圧油が供給される。一方、通路21
はタンク17に接続されている。また、通路26に連な
るボート19は閉じられている。そして、油圧制御回路
Bを構成する電磁切換弁31〜36が車速、機関の回転
数および負荷などに応じてマイクロコンピュータによっ
て選択的に励磁され、油圧アクチュエータ41〜43の
1つが右方または左方へ駆動されて最適の変速が達せら
れる。
Next, the operation of the device of the present invention will be explained. When the vehicle is traveling normally, that is, when the selector lever is in the D range, the recess 7 on the left side of the spool 2 of the hydraulic switching valve A is engaged with the ball 6 of the detent mechanism 5, as shown in FIG. At this time, from the hydraulic power source 12 to the boat 8, the annular groove 9, and the boat 1.
Pressure oil is supplied to the passage 22 via 5. On the other hand, passage 21
is connected to tank 17. Further, the boat 19 connected to the passage 26 is closed. Then, the electromagnetic switching valves 31 to 36 constituting the hydraulic control circuit B are selectively excited by the microcomputer depending on the vehicle speed, engine rotation speed, load, etc., and one of the hydraulic actuators 41 to 43 is activated to the right or left. The optimum speed change is achieved.

いま、電磁切換弁36が励磁されると、油圧源12の圧
油が電磁切換弁36を経て端室57へ送られ、小径ビス
I〜ン59によってシフトロッド56が左方へ押され、
1速段の歯車の噛合いが達成される。同時に、通路22
の圧油は電磁切換弁36を経て誤動作防止弁71へ入り
、ボート79h1ら段付ピストン77の通孔80を経て
段付ピストン77の右端面に圧力を及ぼす。段付ピスト
ン77がばね78の力に抗して左方へ押され、環状溝7
5によってボート74がボート76と接続される。そし
て、端室63の油が互いに接続されるボート76.74
、消磁状態にある電磁切換弁35および通路21を経て
タンク17へ戻される。
Now, when the electromagnetic switching valve 36 is energized, the pressure oil from the hydraulic source 12 is sent to the end chamber 57 via the electromagnetic switching valve 36, and the shift rod 56 is pushed to the left by the small diameter screw I~n 59.
The meshing of the first gear gears is achieved. At the same time, passage 22
The pressure oil enters the malfunction prevention valve 71 via the electromagnetic switching valve 36, and exerts pressure on the right end surface of the stepped piston 77 through the boat 79h1 and the through hole 80 of the stepped piston 77. The stepped piston 77 is pushed to the left against the force of the spring 78 and the annular groove 7
5 connects the boat 74 with the boat 76. and boats 76 and 74 to which the oil in the end chambers 63 are connected to each other.
, and is returned to the tank 17 via the electromagnetic switching valve 35 in a demagnetized state and the passage 21.

電磁切換弁35および電磁切換弁36が励磁されると、
油圧源12の圧油が電磁切換弁36を経て端室57へ送
られるとともに、前述のように、誤動作防止弁71に作
用してボート74と76を接続する。イして、通路22
の圧油が電磁切換弁35および互いに接続されるボート
74.76を経て端室63へ送られる。したがって、大
径ピストン61および中間ピストン60に作用する油圧
が小径ピストン59に作用する油圧に打ち勝ち、シフト
ロッド56が右方へ押され、大径ピストン61が大径シ
リンダの内端壁に衝合したところで停止し、中立位置と
される。
When the electromagnetic switching valve 35 and the electromagnetic switching valve 36 are excited,
Pressure oil from the hydraulic source 12 is sent to the end chamber 57 via the electromagnetic switching valve 36, and acts on the malfunction prevention valve 71 to connect the boats 74 and 76, as described above. Aisle 22
Pressure oil is sent to the end chamber 63 via the electromagnetic switching valve 35 and the boats 74 and 76 connected to each other. Therefore, the hydraulic pressure acting on the large-diameter piston 61 and the intermediate piston 60 overcomes the hydraulic pressure acting on the small-diameter piston 59, and the shift rod 56 is pushed to the right, causing the large-diameter piston 61 to abut against the inner end wall of the large-diameter cylinder. At this point, it stops and assumes a neutral position.

シフトロッド56が中立位置へ戻る途中で、電磁切換弁
36の通電回路が故障により遮断された場合には、端室
57が電磁切換弁36および通路21を経てタンク17
へ接続されることとなるが、誤動作防止弁71の段付ピ
ストン77が図示のようにばね78により右方へ押され
てポート74と76を遮断しているので、通路22の圧
油は電磁切換弁35が励磁されても端室63へ供給され
ない。したがって、シフトロッド56が中立位置を行き
過ぎて後進段ヘシフトされるのを防止することができる
If the energizing circuit of the electromagnetic switching valve 36 is cut off due to a failure while the shift rod 56 is returning to the neutral position, the end chamber 57 is transferred to the tank 17 via the electromagnetic switching valve 36 and the passage 21.
However, since the stepped piston 77 of the malfunction prevention valve 71 is pushed to the right by the spring 78 as shown in the figure, blocking the ports 74 and 76, the pressure oil in the passage 22 is electromagnetic. Even if the switching valve 35 is energized, the power is not supplied to the end chamber 63. Therefore, it is possible to prevent the shift rod 56 from going too far beyond the neutral position and being shifted to the reverse gear.

なお、電磁切換弁36または全ての電磁切換弁の通電回
路が故障した場合には、セレクタレバーによりスプール
2の右側のくぼみ7がディテント機構のボール6に係合
するRレンジへ移動させると、油圧源12に連なるポー
ト8がポート15と遮断され、ボート18が環状溝11
によりボート19と接続される。したがって、圧油が通
路26を経て直接油圧アクチュエータ43の端室63に
甲 送られ、シフトロッド56が後進段ヘシフトされる
。この時、端室57の油は電磁切換弁36および通路2
1を経てタンク17へ戻される。
If the energizing circuit of the electromagnetic switching valve 36 or all of the electromagnetic switching valves malfunctions, if the selector lever is used to move the spool 2 to the R range where the recess 7 on the right side engages with the ball 6 of the detent mechanism, the hydraulic pressure will be reduced. The port 8 connected to the source 12 is cut off from the port 15, and the boat 18 is connected to the annular groove 11.
It is connected to the boat 19 by. Therefore, the pressure oil is directly sent to the end chamber 63 of the hydraulic actuator 43 through the passage 26, and the shift rod 56 is shifted to the reverse gear. At this time, the oil in the end chamber 57 is removed from the electromagnetic switching valve 36 and the passage 2.
1 and then returned to the tank 17.

また、セレクタレバーをNレンジとすると、全ての油圧
アクチュエータ41〜43の両端室63゜57がタンク
17へ接続され、任意のシフトロッド54〜56を手動
により操作することができる。
Further, when the selector lever is set to the N range, both end chambers 63.degree. 57 of all the hydraulic actuators 41-43 are connected to the tank 17, and any shift rods 54-56 can be manually operated.

[発明の効果コ 本発明は上述のように、前進・後進段用シフトロッドを
作動させる油圧アクチュエータ43と、電磁切換弁35
.36からなる油圧制御回路Bとの間に、誤動作防止弁
7′1を挿入接続したから、電磁切換弁35.36の両
方が正常でない限りシフトロッド56は中立位置へ戻さ
れず、また、通電回路の故障による電磁切換弁35.3
6の誤動作により、シフトロッド56が中立位置を越え
て後進段シフト位置へ行き過ぎることもない。また、電
磁切換弁の通電回路が故障した場合には、セレクタレバ
ーにより油圧切換弁をRレンジへ移動させると、油圧源
が直接油圧アクチュエータに接続され、後進・前進段用
シフトロッドが後進段ヘシ 、、、(擾 フトされるので、車両を所要の場所l\移動し避難させ
ることかできる。
[Effects of the Invention] As described above, the present invention includes the hydraulic actuator 43 that operates the shift rod for forward and reverse gears, and the electromagnetic switching valve 35.
.. Since the malfunction prevention valve 7'1 is inserted and connected between the hydraulic control circuit B consisting of the energizing circuit Solenoid switching valve due to failure 35.3
6, the shift rod 56 will not move too far beyond the neutral position to the reverse gear shift position. In addition, if the energizing circuit of the electromagnetic switching valve fails, moving the hydraulic switching valve to the R range using the selector lever will connect the hydraulic power source directly to the hydraulic actuator, and the shift rod for reverse and forward gears will shift to the reverse gear. ,,,(Since it is lifted, the vehicle can be moved to the required location and evacuated.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明に係る自動変速機の油圧制御装置の構成
図、第2図は同油圧制御装置における油圧切換弁の作動
を説明する側面断面図の構成図である。 A:油圧切換弁 B:油圧制御回路 C:油圧アクチュ
エータ 2ニスプール 5:ディテント機構 8.15
.19:ボート 9.11環状溝17:タンク 21.
22:通路 31〜36:電磁切換弁 41〜43:油
圧アクチュエータ56:後進・前進段用シフトロッド 特許出願人 いすず自動車株式会社 特許出願人 川崎重工業株式会社 代理人 弁理士 山本俊夫
FIG. 1 is a configuration diagram of a hydraulic control device for an automatic transmission according to the present invention, and FIG. 2 is a configuration diagram of a side cross-sectional view illustrating the operation of a hydraulic pressure switching valve in the hydraulic control device. A: Hydraulic switching valve B: Hydraulic control circuit C: Hydraulic actuator 2 varnish spool 5: Detent mechanism 8.15
.. 19: Boat 9.11 Annular groove 17: Tank 21.
22: Passage 31-36: Solenoid switching valve 41-43: Hydraulic actuator 56: Shift rod for reverse and forward gears Patent applicant Isuzu Motors Co., Ltd. Patent applicant Kawasaki Heavy Industries Co., Ltd. Agent Patent attorney Toshio Yamamoto

Claims (1)

【特許請求の範囲】[Claims] 後進段と所定の前進段との歯車の噛合いを達成するシフ
トロッドと、該シフトロッドに連結した油圧アクチュエ
ータと、油圧源と前記油圧アクチュエータの一方の端室
との間に挿入接続されかつ前記シフトロッドを所定の前
進段ヘシフトさせるための電磁切換弁と、前記油圧源と
前記油圧アクチュエータの他方の端室との間に直列に接
続した常閉型誤動作防止弁とからなり、前記常閉型誤動
作防止弁が前記電磁切換弁を経て加えられる油圧によっ
て開かれるようにしたことを特徴とする自動変速機の油
圧制御装置。
a shift rod that achieves gear meshing between a reverse gear and a predetermined forward gear; a hydraulic actuator connected to the shift rod; and a hydraulic actuator inserted and connected between a hydraulic power source and one end chamber of the hydraulic actuator; The normally closed malfunction prevention valve includes an electromagnetic switching valve for shifting the shift rod to a predetermined forward gear, and a normally closed malfunction prevention valve connected in series between the hydraulic power source and the other end chamber of the hydraulic actuator. A hydraulic control device for an automatic transmission, characterized in that the malfunction prevention valve is opened by hydraulic pressure applied via the electromagnetic switching valve.
JP59109655A 1984-05-31 1984-05-31 Hydraulic control of automatic transmission Expired - Lifetime JPH0670463B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59109655A JPH0670463B2 (en) 1984-05-31 1984-05-31 Hydraulic control of automatic transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59109655A JPH0670463B2 (en) 1984-05-31 1984-05-31 Hydraulic control of automatic transmission

Publications (2)

Publication Number Publication Date
JPS60256651A true JPS60256651A (en) 1985-12-18
JPH0670463B2 JPH0670463B2 (en) 1994-09-07

Family

ID=14515790

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59109655A Expired - Lifetime JPH0670463B2 (en) 1984-05-31 1984-05-31 Hydraulic control of automatic transmission

Country Status (1)

Country Link
JP (1) JPH0670463B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887491A (en) * 1988-04-29 1989-12-19 Chrysler Motors Corporation Solenoid-actuated valve arrangement for a limp-home mode of an automatic transmission

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4825199U (en) * 1971-07-31 1973-03-24

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4825199U (en) * 1971-07-31 1973-03-24

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887491A (en) * 1988-04-29 1989-12-19 Chrysler Motors Corporation Solenoid-actuated valve arrangement for a limp-home mode of an automatic transmission

Also Published As

Publication number Publication date
JPH0670463B2 (en) 1994-09-07

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