JPS5943205A - Digital actuator - Google Patents

Digital actuator

Info

Publication number
JPS5943205A
JPS5943205A JP15330582A JP15330582A JPS5943205A JP S5943205 A JPS5943205 A JP S5943205A JP 15330582 A JP15330582 A JP 15330582A JP 15330582 A JP15330582 A JP 15330582A JP S5943205 A JPS5943205 A JP S5943205A
Authority
JP
Japan
Prior art keywords
piston
diameter
cylinder
axial direction
small
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.)
Pending
Application number
JP15330582A
Other languages
Japanese (ja)
Inventor
Kazunari Imazato
和成 今里
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.)
MITSUWA SEIKI CO Ltd
Sanwa Seiki Ltd
Original Assignee
MITSUWA SEIKI CO Ltd
Sanwa Seiki Ltd
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 MITSUWA SEIKI CO Ltd, Sanwa Seiki Ltd filed Critical MITSUWA SEIKI CO Ltd
Priority to JP15330582A priority Critical patent/JPS5943205A/en
Publication of JPS5943205A publication Critical patent/JPS5943205A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/12—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
    • F15B11/121—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions
    • F15B11/123—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions by means of actuators with fluid-operated stops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/26—Generation or transmission of movements for final actuating mechanisms
    • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
    • F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
    • F16H2061/307—Actuators with three or more defined positions, e.g. three position servos

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To enable a speed changer or the like to be set in three positions with simple construction in small size, by actuating a cylinder, combined with major and minor pistons namely two pistons in total, with hydraulic pressure from both ends of said cylinder. CONSTITUTION:If the oil pressure in a hydraulic power source 4 is simultaneously applied to ports 1d, 1e by a selector valve 5, a piston 2 is pressed to the right end, while a piston 3 is pressed to a stopper 2f in the internal face of the piston 2 and set to the intermediate position in the axial direction by a difference between piston areas. If the oil pressure is applied only to the port 1d and the port 1e is opened to a reservoir 6 by the selector valve 5, the pistons 2, 3 are moved to the right end. While if the port 1d is opened to the reservoir 6 and the oil pressure is fed only to the port 1e by the selector valve 5, the pistons 2, 3 are transferred to the left end. Accordingly, a rod 3a, being able to be set to the intermediate position and the both right and left ends, that is, three positions, can operate a lever 7a of a speed changer 7 to be set to each speed change position. Thus, an actuator can be made short in its length in the axial direction while, only two places are required for the port introducing the hydraulic pressure.

Description

【発明の詳細な説明】 本発明は、流体動力１；よって作動するディジタルアク
チュエータに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital actuator actuated by fluid power 1;

従来、流体作動圧によって作動するディジタルアクチュ
エータは、その軸方向における長だが＋＜、Ｗ＋こ、自
動車における変速機の変速操作等のスペースに制［１り
のある部分に使用するためには不便が多かっｔ−０ 本発明は、上記のような従来の問題点を改良したコンパ
クトなディジタルアクチュエータを提供することにある
。Conventionally, digital actuators operated by fluid working pressure have a long length in the axial direction, but this is inconvenient when used in areas where space is limited, such as when operating a transmission in an automobile. The object of the present invention is to provide a compact digital actuator that solves the above-mentioned conventional problems.

以下、実施例【；基づいて本発明を説明する。The present invention will be described below based on Examples.

第１図は、本発明におけるディジタルアクチュエータの
・一実施例を側断面図によって小しｒこものであり、第
２図は、第１図におけるディジタルアクチュエータ１０
を、自動車における歯車変速機７１；使用した場合のシ
ステム図を一小したものである。FIG. 1 shows a small cross-sectional side view of one embodiment of the digital actuator according to the present invention, and FIG. 2 shows the digital actuator 10 in FIG. 1.
This is a scaled-down system diagram of a gear transmission 71 used in an automobile.

第１図においで、ケーシング１には大径のシリンダ１ａ
と小径のシリンダ１ｂを穿設し、大径のシリンダ１ａに
は、軸方向への摺動運動を可能に、ピストン２における
大径のピストン２ａが嵌合し、小径のシリンダ１ｂには
、同様に軸方向への摺動運動を可能に、ピストン２にお
ける小径のピストン２ｂが嵌合している。In Fig. 1, the casing 1 has a large diameter cylinder 1a.
A small-diameter cylinder 1b is bored into the large-diameter cylinder 1a, and a large-diameter piston 2a of the piston 2 is fitted into the large-diameter cylinder 1a to enable sliding movement in the axial direction. A small-diameter piston 2b of the piston 2 is fitted into the piston 2 to allow sliding movement in the axial direction.

ピストン２には、シリンダ１ａおよび１ｂと同一軸方向
への、シリンダ２Ｃを穿設し、シリンダ２Ｃへは、軸方
向への摺動運動を可能にピストン３が嵌合し、ピストン
３にはロッド３ａが固着し、ロッド３ａは、変速機７に
おける変速レバー７ａとリンク結合している。A cylinder 2C is bored in the piston 2 in the same axial direction as the cylinders 1a and 1b, and a piston 3 is fitted into the cylinder 2C to enable sliding movement in the axial direction. 3a is fixed, and the rod 3a is linked to a shift lever 7a in the transmission 7.

ピストン２１こおける端面２ｄが露呈している側の押し
のけ室１ｆは、ポート１ｄおよび切換弁５を介しで、油
圧源４あるいはりザーバ６へ選択的に連通する構成にな
し、ピストン２における端面２ｅおよびピストン３にお
ける端面３Ｃのそれぞれが露呈する側の押しのけ室１ｂ
は、ポート１ｅおよび切換弁５を介して、油圧源４．１
５るいはリザーバ６へ選択的に連通する構成となってい
る。The displacement chamber 1f on the side where the end surface 2d of the piston 21 is exposed is configured to selectively communicate with the hydraulic pressure source 4 or reservoir 6 via the port 1d and the switching valve 5, and the displacement chamber 1f on the side where the end surface 2d of the piston 2 is exposed. and the displacement chamber 1b on the side where each of the end surfaces 3C of the piston 3 is exposed.
is connected to the hydraulic power source 4.1 via the port 1e and the switching valve 5.
5 or reservoir 6 selectively.

また、ピストン２における端面２ｇが露呈しでいる室１
ｇは、常にリザーバ６へ開放しでおり、端面２ｇのピス
トン２の軸方向における投影面積は、ロッド３ａの横断
面積よＱ大となっている。Further, the chamber 1 in which the end surface 2g of the piston 2 is exposed
g is always open to the reservoir 6, and the projected area of the end face 2g in the axial direction of the piston 2 is Q larger than the cross-sectional area of the rod 3a.

以上の構成「こおいて、以下、その作用を説明する。With the above configuration in mind, the operation will be explained below.

切換弁５を作動させ、油圧源４における油圧をボート１
ｄおよび１ｅの両ボートへ同時に作用させると、ロッド
３ａにおける横断面積が端面２ｇの投影面積より小であ
り、且つロゲド３ａと端面２ｇが大気に解放されている
ため、端面２ｄ側に作用する油圧の押圧力が　ｊｉｉ、
ｉ面２〔？の側に作櫂する油圧の押圧力よＱ大となって
、ピストン２は、図示のように、右端に１甲ＬＬ固疋さ
れる。The switching valve 5 is operated to change the oil pressure in the oil pressure source 4 to the boat 1.
When applied to both boats d and 1e at the same time, the cross-sectional area of the rod 3a is smaller than the projected area of the end face 2g, and the rod 3a and the end face 2g are open to the atmosphere, so the hydraulic pressure acting on the end face 2d side is The pressing force of jii,
i-side 2 [? The pressing force of the hydraulic pressure applied to the side of the piston is Q greater, and the piston 2 is fixed to the right end by one inch as shown in the figure.

また、この作用時において、ピストン３については、端
面３ｂの側における受圧面積が端面３０の側１；おける
受圧面積より小であるｔ−め、該両端面に作用する油圧
の押圧力は、端面３Ｃの側に作用する押圧力の方が大と
なって、ピストン３は図示のように、ストッパ２ｆに当
接する位置に押圧固定する。In addition, during this action, the pressure receiving area of the piston 3 on the side of the end surface 3b is smaller than the pressure receiving area on the side 1 of the end surface 30, so the pressing force of the hydraulic pressure acting on both end surfaces is The pressing force acting on the side 3C is larger, and the piston 3 is pressed and fixed at a position where it contacts the stopper 2f, as shown in the figure.

このように、ボート１ｄおよび１ｅへ同時に油圧を作用
させたとき、ピストン３は、軸方向中間の位置に設定さ
れることになる。In this way, when hydraulic pressure is applied to the boats 1d and 1e simultaneously, the piston 3 is set at an intermediate position in the axial direction.

上記図示の状態から、切換弁５を作動させで、ボート１
ｄのみに油圧を作用させ、ポート１ｅをリザーバ６に解
放すると、該油圧によって端面２ｄが押圧され、ピスト
ン２は図ンｆ（の状態を維持する。しかし、ピストン３
は端面３Ｃの側が大気１こ解放されるため、右端まで抑
圧移動される。From the state shown above, operate the switching valve 5, and the boat 1
When hydraulic pressure is applied only to d and the port 1e is released to the reservoir 6, the end face 2d is pressed by the hydraulic pressure, and the piston 2 maintains the state shown in Fig.
Since the end surface 3C side is released by one atmosphere, it is suppressed and moved to the right end.

上記作動とは逆に、切換弁５を作動させ、ボーｈ　ｌｄ
をリザーバ６に開放させ、ボートｌｅのみに油圧を送る
と、ピストン２および３は一体となったまま、左端に移
行する。Contrary to the above operation, the switching valve 5 is operated and the bow h ld
When the reservoir 6 is opened and hydraulic pressure is sent only to the boat le, the pistons 2 and 3 move to the left end while remaining as one body.

以上のように、左右両端と中間の３点の位置を設定可能
なロッド３ａｌよ、変速機７におけるレバー７ａを操作
しで、変速機７における各変速位置を設定する。As described above, each shift position in the transmission 7 is set by operating the lever 7a in the transmission 7 using the rod 3al, which can set the positions of the three points at both left and right ends and in the middle.

なお、上記実施例は、ディジタルアクチュエータ１０を
変速機７に装着した場合ｆこついて説明しているが、本
発明におけるディジタルアクチュエータ１０は、他の場
合における３位置制御のディジタルアクチュエータとし
でも使用出来ることは、容易に理解さ冶るであろう。Although the above embodiment describes the case where the digital actuator 10 is attached to the transmission 7, the digital actuator 10 of the present invention can also be used as a three-position control digital actuator in other cases. will be easily understood and cured.

以上の説明から明らかなように、本発明におけるディジ
タルアクチュエータは、小ピストン２ｇの軸方向投影面
積をピストン３のロッド３ａにおける横断面積より大と
することにＪっで、ロッド３ａに３位置の位置制御を−
Ｏ］（１しとする構成としたことより、その軸方向長さ
１．を非；；９に短かくなり、ま１こ流体圧を導び（ポ
ート杵０．１ｄおよび１ｅのユイ固所のボートて／斉む
ことがら、その構成も単純となる。As is clear from the above description, the digital actuator according to the present invention is designed such that the axial projected area of the small piston 2g is larger than the cross-sectional area of the rod 3a of the piston 3, and the rod 3a has three positions. Control -
O] (1), the axial length 1. is shortened to 9. The structure of the boat is simple.

また、本発明におけるｆイジタルアクヲ−］］二１−−
タ１を、自動車の変速位置制御用としで１・Ｊ２用する
ときは、そのコンパクトな構成かも、制限された狭い空
間に有効に装名−が可ｒ」Ｌとなり、且つ制御用ボート
？ｄおよび１ｅが２個順て゛、３位置の変速位置を設定
出来ると言うことは、切換弁５の構成およびそれらに関
連する自己管が単純となり、安価に設計出来る利点をイ
ラしでいるものである。In addition, f digital aqua in the present invention]]21--
When the TA 1 is used for controlling the gear shift position of an automobile, it can be mounted effectively in a limited space due to its compact structure. The fact that three shift positions can be set for two d and 1e in sequence makes the structure of the switching valve 5 and its associated self-tube simple, which is an advantage in that it can be designed at low cost. be.

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

第１図は、本発明における一実施例としてのディジタル
アクチュエータの側断面図を示し、第２図は、第１図に
おけるディジタルアクチュエータ１０を、自動車におけ
る変速機７に装着した場合のシステム図を示したもので
ある。 実施例に使用した符号は下記のとおりである１：ケーシ
ング １ａおよび１ｂ；シリング、　　ＩＣ１１ｄおよび１ｅ
：ボート、　１ｆおよび１ｈ：押しのけ室、　　１ｇ：
室。 ２および３：ピストン ２ａ：大径のピストン、　２ｂ＝小径のピストン、　　
２Ｃニジリンダ、　　２ｄ１２ｅおよび２ｇ＝端面、　
２ｆ　：ストツパ、３ａ：ロッド、　３ｂおよび３Ｃ：
端面。 ４　；　油圧、原、　　　５　：　切換弁、７：変速機 ７ａ　ニレパー。 特許出願人　　　三輪精機株式会社 代表者　西海悦史 第　２　図FIG. 1 shows a side sectional view of a digital actuator as an embodiment of the present invention, and FIG. 2 shows a system diagram when the digital actuator 10 in FIG. 1 is installed in a transmission 7 in an automobile. It is something that The codes used in the examples are as follows: 1: Casings 1a and 1b; Schilling, IC11d and 1e
: Boat, 1f and 1h: Displacement room, 1g:
Room. 2 and 3: Piston 2a: large diameter piston, 2b = small diameter piston,
2C Nijilinda, 2d12e and 2g = end face,
2f: Stopper, 3a: Rod, 3b and 3C:
End face. 4: Hydraulic pressure, original, 5: Switching valve, 7: Transmission 7a Nileper. Patent applicant: Sanwa Seiki Co., Ltd. Representative: Etsushi Nishikai Figure 2

Claims (1)

【特許請求の範囲】 １、ケーシング（１）には、同一軸方向に、大径のシリ
ンダ（１ａ）および小径のシリンダ（１ｂ）を穿設し、 前記大径のシリンダには、前−記軸方向への摺動運動を
可能１こ、大径のピストンが嵌合し前記小径のシリンダ
ｌこは、前記軸方向への摺動運動を可能に、小径のピス
トンが嵌合し且つ前記大径のピストンと前記小径のピス
トンは一体の−のピストン（２）を構成し、前記−のピ
ストンには、、前記軸方向に他のシリンダ（２Ｃ）を穿
設し、 前記他のシリンダ１ユ、前記小径のピストンの側におい
て−の４１ｐＬのけ室（１ｈ）に開放し、且つ前記大径
のピストンの側にストッパ（２ｆ）を固設している構成
をなし、 前記他のシリンダには、へＩＩ記釉方向への摺動運動を
可能に、他のピストン（３）が嵌合し、 前記他のピストンには、前記釉ノフ向にしで、且つ前記
ストッパの固設する側にＤ・ンド　（３α）を固着し、 前記ロッドと、前記大径のピストンと前記小径のピスト
ン七の径の差から生ずる面積差部分（２ｇ）の両者は大
気に露呈し、 前記−のピストンにおける前記大径のピストンの存在す
る側の端面（２ｄ）と、前記−のピストンにおける前記
小径のピストンが存在する側の端面は、それぞれ押しの
け室（１ｆ）および前記−の押じのけ室（ｌｈ）＋？露
呈し、 前記押しのけ室および前記−のＴ（１シのけ室のそれぞ
れには、それぞれ流体圧が選択的に作用する構成をなし
、 前記面積差部分における前記軸方向に垂直な断面積は、
前記ロッドにおける前記軸方向に垂直な断面積よＱ大と
なっているものであることを特徴とするディジタルアク
チュエータ。 ２、ロッド　（３ａ）は、変速機（７）における変速位
置を操作するロッドである特許８１！ｉ求の範囲第１項
記載のディジタルアクチュエータ[Claims] 1. A large-diameter cylinder (1a) and a small-diameter cylinder (1b) are bored in the casing (1) in the same axial direction, and the large-diameter cylinder has the above-mentioned structure. The small diameter cylinder is fitted with a large diameter piston that allows sliding movement in the axial direction, and the small diameter cylinder is fitted with a small diameter piston that allows sliding movement in the axial direction. The piston with a larger diameter and the piston with a smaller diameter constitute an integral - piston (2), and the - piston has another cylinder (2C) bored in the axial direction, and the other cylinder 1 unit , is open to a -41 pL chamber (1h) on the side of the small-diameter piston, and has a stopper (2f) fixed on the side of the large-diameter piston, and the other cylinder has a , to II. Another piston (3) is fitted to enable sliding movement in the glaze direction, and the other piston has a D-shaped surface facing toward the glaze nof and on the side where the stopper is fixed. The rod and the area difference portion (2g) resulting from the difference in diameter between the large diameter piston and the small diameter piston 7 are exposed to the atmosphere, and the above in the - piston is fixed. The end face (2d) on the side where the large-diameter piston exists and the end face on the side where the small-diameter piston exists in the - piston are the displacement chamber (1f) and the - displacement chamber (lh), respectively. +? Each of the displacement chamber and the - T displacement chamber is configured such that fluid pressure selectively acts on each of them, and the cross-sectional area perpendicular to the axial direction in the area difference portion is:
A digital actuator characterized in that the cross-sectional area of the rod perpendicular to the axial direction is Q larger. 2. Rod (3a) is a rod that operates the shift position in the transmission (7) Patent 81! Digital actuator according to item 1 of the desired range
JP15330582A 1982-09-02 1982-09-02 Digital actuator Pending JPS5943205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15330582A JPS5943205A (en) 1982-09-02 1982-09-02 Digital actuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15330582A JPS5943205A (en) 1982-09-02 1982-09-02 Digital actuator

Publications (1)

Publication Number Publication Date
JPS5943205A true JPS5943205A (en) 1984-03-10

Family

ID=15559572

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15330582A Pending JPS5943205A (en) 1982-09-02 1982-09-02 Digital actuator

Country Status (1)

Country Link
JP (1) JPS5943205A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5125326A (en) * 1991-01-29 1992-06-30 Rockwell International Corporation Three position actuator having a neutral normal position for shifting a two speed transfer case
US5603305A (en) * 1995-05-22 1997-02-18 Mitsubishi Denki Kabushiki Kaisha Exhaust gas recirculation valve
US5957028A (en) * 1995-03-04 1999-09-28 Hydraulik-Ring Antriebs- Und Steuerungstechnik Gmbh Actuator for gear shifting mechanisms for motor vehicles
EP1124311A2 (en) * 2000-02-10 2001-08-16 Sumitomo Metal Industries, Ltd Eddy current braking apparatus
EP1010897A3 (en) * 1998-12-17 2002-04-10 Volkswagen Aktiengesellschaft Hydraulic positioning means
WO2008027168A1 (en) * 2006-08-28 2008-03-06 Caterpillar Inc. Transmission shift mechanism with single-end actuation

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5125326A (en) * 1991-01-29 1992-06-30 Rockwell International Corporation Three position actuator having a neutral normal position for shifting a two speed transfer case
US5957028A (en) * 1995-03-04 1999-09-28 Hydraulik-Ring Antriebs- Und Steuerungstechnik Gmbh Actuator for gear shifting mechanisms for motor vehicles
US5603305A (en) * 1995-05-22 1997-02-18 Mitsubishi Denki Kabushiki Kaisha Exhaust gas recirculation valve
EP1010897A3 (en) * 1998-12-17 2002-04-10 Volkswagen Aktiengesellschaft Hydraulic positioning means
EP1124311A2 (en) * 2000-02-10 2001-08-16 Sumitomo Metal Industries, Ltd Eddy current braking apparatus
US6725982B2 (en) 2000-02-10 2004-04-27 Sumitomo Metal Industries, Ltd. Eddy current braking apparatus
EP1124311A3 (en) * 2000-02-10 2004-08-25 Sumitomo Metal Industries, Ltd Eddy current braking apparatus
WO2008027168A1 (en) * 2006-08-28 2008-03-06 Caterpillar Inc. Transmission shift mechanism with single-end actuation
US8117934B2 (en) 2006-08-28 2012-02-21 Caterpillar Inc. Transmission shift mechanism with single-end actuation

Similar Documents

Publication Publication Date Title
US4907495A (en) Pneumatic cylinder with integral concentric hydraulic cylinder-type axially compact brake
KR900015971A (en) Hydraulically Actuated Controls for Range-type Combined Transmissions
GB2024965A (en) Apparatus for power-assisted gear changing in mechanical gearboxes
US4467894A (en) Fluid power system
US5816131A (en) Fluid-controlled actuator assembly
US4125059A (en) Fluid pressure operable servo positioner
JPS5943205A (en) Digital actuator
KR940005446A (en) Dual Force Fluid Actuated Shifters
US5317953A (en) Neutral-centering valve control system
EP2497958A2 (en) Fluid operated actuation system
US4991493A (en) Cylinder with two concentric pistons actuated by a pressure medium and extending to three times the length of the cylinder
KR940021949A (en) Remote control system for operating hydraulic drives
US5279172A (en) Four position fluid-actuated piston arrangement
BR0109248A (en) Hydraulic actuation device, device for tilting a vehicle cab, and motor vehicle
WO1982002423A1 (en) Valve actuator
JPH021574Y2 (en)
JPH0450450B2 (en)
JP3722917B2 (en) Thin actuator
PL179398B1 (en) Boostering air cylinder
JPS5913745U (en) Hydraulically operated gear transmission
JPS58166155A (en) Shift lever operating device of transmission for automobile
JP2597181Y2 (en) Gearbox for gearbox operation
JP2966827B2 (en) Power shifter
JPH0228251Y2 (en)
JP2004150308A (en) Pumping installation