JPH0254248B2 - - Google Patents

Info

Publication number
JPH0254248B2
JPH0254248B2 JP59161304A JP16130484A JPH0254248B2 JP H0254248 B2 JPH0254248 B2 JP H0254248B2 JP 59161304 A JP59161304 A JP 59161304A JP 16130484 A JP16130484 A JP 16130484A JP H0254248 B2 JPH0254248 B2 JP H0254248B2
Authority
JP
Japan
Prior art keywords
pair
angle
tank
oil
swash plate
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.)
Expired - Lifetime
Application number
JP59161304A
Other languages
Japanese (ja)
Other versions
JPS6137540A (en
Inventor
Yoshuki Katayama
Shohei Nakai
Seiichi Ishiizumi
Shozo Ishimori
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.)
Kubota Corp
Original Assignee
Kubota Corp
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 Kubota Corp filed Critical Kubota Corp
Priority to JP16130484A priority Critical patent/JPS6137540A/en
Publication of JPS6137540A publication Critical patent/JPS6137540A/en
Publication of JPH0254248B2 publication Critical patent/JPH0254248B2/ja
Granted 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/0406—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed during starting or stopping
    • 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
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/46—Automatic regulation in accordance with output requirements
    • F16H61/461—Automatic regulation in accordance with output requirements not involving a variation of the output capacity of the main pumps or motors
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20561—Type of pump reversible
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/27—Directional control by means of the pressure source
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41572—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and an output member
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F15B2211/50527—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves using cross-pressure relief valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
    • F15B2211/5154—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve being connected to multiple ports of an output member
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7058—Rotary output members
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8606—Control during or prevention of abnormal conditions the abnormal condition being a shock

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Motor Power Transmission Devices (AREA)
  • Control Of Fluid Gearings (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、油圧ポンプと油圧モータとから成る
走行用無段変速装置を設けると共に、前記ポンプ
と前記モータを接続する一対の油路夫々に、この
油路をタンクに連通させる開位置とこの連通を断
つ閉位置とに切換え自在な開閉弁を、前記開位置
に絞り部を備えさせた状態で設けた走行用伝動装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a continuously variable transmission for traveling consisting of a hydraulic pump and a hydraulic motor, and a pair of oil passages connecting the pump and the motor. The present invention relates to a traveling transmission device including an on-off valve that can be freely switched between an open position where the oil passage communicates with a tank and a closed position where the communication is cut off, with a throttle portion provided in the open position.

〔従来の技術〕[Conventional technology]

上記無段変速装置にあつては中立への自己復元
力を有しているも、この復元力は斜板が中立位置
に近付くほど低下することから、無段変速装置が
完全に停止する中立状態を確実に現出できるとい
う安全のために、斜板が本来の中立位置に戻らな
くともその付近まで戻るとモータ駆動が停止され
るようにするのに、すなわち、実質上の中立位置
を斜板角が本来の中立に相当する値及び中立付近
に相当する値となるものにするのに、従来、第５
図に示すように構成していた。すなわち、前記開
閉弁１４ａ，１４ｂの夫々をスプリング１５ａ又
は１５ｂにより開位置Ｏに付勢すると共に、開閉
弁１４ａ，１４ｂの夫々に対するパイロツト操作
回路２２ａ又は２２ｂを油圧ポンプ６と油圧モー
タ７の接続油路１０ａ又は１０ｂに接続し、斜板
角が中立及びこれの付近に相当する設定値よりも
高速側の値に在ると、開閉弁１４ａ，１４ｂの
夫々が前記油路１０ａ又は１０ｂからの圧油によ
つて自動的に閉位置Ｃに切換えられるようにし、
かつ、斜板角が前記設定値になると、開閉弁１４
ａ，１４ｂの夫々が開位置Ｏに自動的に切換えら
れ、斜板が中立から若干外れた角度に在つても、
ポンプ６からの供給圧油が開閉弁１４ａ又は１４
ｂを通つてタンク１１に戻るようにしていた。 Although the above-mentioned continuously variable transmission has a self-restoring force to neutral, this restoring force decreases as the swash plate approaches the neutral position, so the continuously variable transmission is in a neutral state where it completely stops. In order to ensure that the swash plate can appear reliably, the motor drive is stopped when the swash plate returns to its original neutral position, even if it does not return to its original neutral position. Conventionally, in order to set the angle to a value corresponding to the original neutral and a value corresponding to near neutral, the fifth
It was configured as shown in the figure. That is, each of the on-off valves 14a and 14b is urged to the open position O by a spring 15a or 15b, and the pilot operation circuit 22a or 22b for each on-off valve 14a and 14b is connected to the hydraulic pump 6 and the hydraulic motor 7 by connecting oil. When connected to the oil passage 10a or 10b and the swash plate angle is at a value on the high-speed side than the set value corresponding to neutral and the vicinity thereof, the on-off valves 14a and 14b are connected to the pressure from the oil passage 10a or 10b, respectively. so that it can be automatically switched to the closed position C by oil,
And when the swash plate angle reaches the set value, the on-off valve 14
Even if each of a and 14b is automatically switched to the open position O, and the swash plate is at an angle slightly away from neutral,
The pressure oil supplied from the pump 6 is supplied to the on-off valve 14a or 14.
It was designed to return to tank 11 through b.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来の中立設定構成の場合、発進時において、
開閉弁１４ａ又は１４ｂの絞り部３０のためにポ
ンプ６からの供給圧油の一部がタンク１１に流入
することに起因し、斜板角が中立用の前記設定範
囲を高速側に越えた値になつてから開閉弁１４ａ
又は１４ｂが閉位置Ｃに切換わるために、モータ
７が比較的高圧の圧油で急激に駆動開始されるこ
とになり、大なる発進衝撃が生じていた。さらに
は、減速時において、慣性回動する走行装置によ
りモータ７が駆動され、一対の前記接続油路１０
ａ，１０ｂのうちの油戻り側に相当するものの油
圧が高くなつてこの油路の側の開閉弁１４ａ又は
１４ｂが閉位置Ｃになるために、モータ７が急制
動されることになり、大なる減速衝撃が生じてい
た。 In the case of the conventional neutral setting configuration, when starting,
A value in which the swash plate angle exceeds the neutral setting range to the high speed side due to part of the pressure oil supplied from the pump 6 flowing into the tank 11 due to the throttle part 30 of the on-off valve 14a or 14b. Opening/closing valve 14a
Alternatively, since the motor 14b is switched to the closed position C, the motor 7 is suddenly started to be driven by relatively high-pressure oil, resulting in a large starting impact. Furthermore, during deceleration, the motor 7 is driven by the traveling device rotating inertia, and the pair of connecting oil passages 10
The oil pressure of the one corresponding to the oil return side among the oil passages a and 10b becomes high and the on-off valve 14a or 14b on this oil path side moves to the closed position C, causing the motor 7 to be suddenly braked, resulting in a large amount of damage. A deceleration shock occurred.

本発明の目的は、発進時及び減速時の衝撃を極
力小に抑制しながらも、前述した確実な中立状態
を現出できるようにした走行用伝動装置を提供す
ることにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a traveling transmission device that can achieve the above-mentioned reliable neutral state while suppressing shocks at the time of starting and decelerating to a minimum.

〔問題点を解決するための手段〕[Means for solving problems]

本発明が特徴とするところは、冒頭に記載した
走行用伝動装置において、前記油圧ポンプにおけ
る斜板の角度を検出するセンサーを設けると共
に、前記油圧ポンプの吐出力が零となる前記角度
の中立及びこれの付近に相当する設定値であると
自動的に一対の前記油路が共に対タンク連通状態
となり、前記油圧モータが駆動停止した前記無段
変速装置の中立状態が現出されるように、かつ、
前記角度が前記設定値より高速側に相当する値に
あると、自動的に一対の前記油路のうちの供給側
が対タンク非連通状態で戻り側が対タンク連通状
態となり、前記油圧モータが駆動される前記無段
変速装置の作動状態が現出されるように、前記セ
ンサーからの情報に基いて一対の前記開閉弁を自
動操作する機構を設けてあることにあり、その作
用及び効果は次のとおりである。 The present invention is characterized in that, in the traveling transmission device described at the beginning, a sensor is provided to detect the angle of the swash plate in the hydraulic pump, and the neutral and neutral angles at which the discharge force of the hydraulic pump becomes zero are provided. When the set value is around this value, the pair of oil passages are automatically brought into communication with the tank, and a neutral state of the continuously variable transmission in which the hydraulic motor is stopped is achieved. and,
When the angle is at a value corresponding to a higher speed than the set value, the supply side of the pair of oil passages is automatically placed in a non-communicating state with the tank, and the return side is automatically placed in a communicating state with the tank, and the hydraulic motor is driven. A mechanism is provided to automatically operate the pair of on-off valves based on information from the sensor so that the operating state of the continuously variable transmission is indicated, and its functions and effects are as follows. That's right.

〔作用〕[Effect]

斜板が本来の中立位置の付近に相当する角度に
なると操作機構が一対の開閉弁のいずれをも開位
置に自動操作して、斜板角が本来の中立に相当す
るものの付近に戻るとモータ駆動が停止される中
立位置を、点的なものではなく範囲をもつたもの
に設定でき、かつ、強制的に無段変速装置の中立
状態を現出させるようになる。 When the swash plate reaches an angle corresponding to the vicinity of its original neutral position, the operating mechanism automatically operates both of the pair of on-off valves to the open position, and when the swash plate angle returns to the vicinity of its original neutral position, the motor The neutral position at which the drive is stopped can be set to have a range rather than a point, and the continuously variable transmission can be forcibly brought into a neutral state.

そして、戻り側油路の圧がたとえ高くなつても
開位置に維持し、ポンプからの供給圧油がタンク
に戻ること、及び、中立に減速操作された際にモ
ータからの戻り油がタンクに戻ることの夫々を可
能にする。 Even if the pressure in the return side oil passage becomes high, it is maintained in the open position so that the pressure oil supplied from the pump returns to the tank, and when the deceleration operation to neutral is performed, the return oil from the motor is returned to the tank. Allow each of you to go back.

斜板が前記設定値から高速側に外れた角度に変
化すると、操作機構が供給側油路に対する開閉弁
を斜板角変化に遅れのない応答性の良い状態で閉
位置に自動操作し、モータに対する作用油圧を設
定中立位置によつて定まる低圧から次第に増大す
る状態にできること、すなわち、油圧モータの起
動が円滑に行われることを可能にする。 When the swash plate changes to an angle that deviates from the set value to the high speed side, the operating mechanism automatically operates the on-off valve for the supply side oil passage to the closed position with good responsiveness without delay to the swash plate angle change, and the motor The hydraulic pressure applied to the hydraulic motor can be gradually increased from a low pressure determined by the set neutral position, that is, the hydraulic motor can be started smoothly.

また、操作機構が戻り側油路に対する開閉弁を
開位置に自動操作すると共に、油路の圧がたとえ
高くなつても開位置に維持し、減速操作された際
にモータからの戻り油が開閉弁を通つてタンクに
比較的スムーズに戻ること、すなわち、油圧モー
タが緩制動されることをも可能にする。 In addition, the operating mechanism automatically operates the on-off valve for the return side oil path to the open position, maintains it in the open position even if the pressure in the oil path increases, and the return oil from the motor opens and closes when deceleration is performed. It also allows a relatively smooth return to the tank through the valve, ie the hydraulic motor is braked slowly.

〔発明の効果〕〔Effect of the invention〕

従つて、発進時におけるモータの急速回動開始
に起因する衝撃、及び減速時におけるモータの急
停止に起因する衝撃の双方を極力抑制できるよう
にしながらも、自動操向機構によつて確実に無段
変速装置の中立状態を現出し得るので、極めて安
全便利にかつ快適に走行用伝動装置の操縦ができ
るようにできた。 Therefore, while it is possible to suppress as much as possible both the shock caused by the rapid start of rotation of the motor during start-up and the shock caused by the sudden stop of the motor during deceleration, the automatic steering mechanism ensures that the impact is completely eliminated. Since the neutral state of the gear transmission can be brought out, the driving transmission can be operated extremely safely, conveniently, and comfortably.

〔実施例〕〔Example〕

第４図に示すように、左右一対の操向型前車輪
１，１及び非操向型後車輪２，２の夫々を駆動可
能に有した走行機体の後部に、ロータリー耕耘装
置等の作業装置を昇降操作可能に連結するリフト
アーム３、、及び、連結作業装置に伝動する動力
取出し軸４を設けて、乗用型農用トラクターを構
成してある。 As shown in FIG. 4, a working device such as a rotary tiller is installed at the rear of a traveling body that has a pair of left and right steering type front wheels 1, 1 and a non-steering type rear wheel 2, 2 that can be driven. A riding type agricultural tractor is constructed by providing a lift arm 3 that connects the tractors so that they can be raised and lowered, and a power take-off shaft 4 that transmits power to the connecting work device.

エンジン５と、前後輪１，２に対する幅ギアー
トランスミツシヨン（図示せず）との間に、油圧
ポンプ６と油圧モータ７とから成り、かつ、中立
を挾んで前進側と後進側とに切換え可能な走行用
無段変速装置８をミツシヨンケース９に内装した
状態で設けてある。 It consists of a hydraulic pump 6 and a hydraulic motor 7 between the engine 5 and a width gear transmission (not shown) for the front and rear wheels 1 and 2, and is configured to switch between forward and reverse sides with a neutral state in between. A continuously variable transmission device 8 for traveling is provided inside a transmission case 9.

第１図に示すように、前記油圧ポンプ６と油圧
モータ７を接続する一対の油路１０ａ，１０ｂの
夫々に、この油路１０ａ又は１０ｂと作動油タン
クとしての無段変速装置ケース１１とを接続する
排油路１２ａ又は１２ｂを接続すると共に、これ
ら排油路１２ａ，１２ｂの夫々に、開位置Ｏに絞
り部１３を備えさせた開閉弁１４ａ、又は１４ｂ
を設けて、これら開閉弁１４ａ，１４ｂにより、
一対の前記油路１０ａ，１０ｂを変速装置ケース
１１に連通する状態と、この連通を断つ状態とに
各別に切換えられるように構成してある。そし
て、一対の前記開閉弁１４ａ，１４ｂの夫々を、
開位置Ｏにスプリング１５ａ又は１５ｂにより付
勢された電磁操作弁に構成し、これら開閉弁１４
ａ，１４ｂの操作回路１６を、前記無段変速装置
８を操作する前記油圧ポンプ６の斜板（図外）に
斜板操作用回転軸（図外）を介して斜板角の検出
をするように連動させたポテンシヨメータ１７に
連係させると共に、このポテンシヨメータ１７か
らの情報に基いて一対の開閉弁１４ａ，１４ｂを
自動操作するように構成してあり、無段変速装置
８の中立状態が確実に現出されると共に、発進時
及び減速時の衝撃が抑制されるようにしてある。 As shown in FIG. 1, each of the pair of oil passages 10a and 10b connecting the hydraulic pump 6 and the hydraulic motor 7 is connected to the oil passage 10a or 10b and the continuously variable transmission case 11 as a hydraulic oil tank. An on-off valve 14a or 14b that connects the drain oil passages 12a or 12b and has a throttle portion 13 in the open position O for each of the oil drain passages 12a, 12b.
are provided, and with these on-off valves 14a and 14b,
The pair of oil passages 10a, 10b are configured to be able to be switched individually between a state in which they communicate with the transmission case 11 and a state in which the communication is cut off. Then, each of the pair of on-off valves 14a, 14b,
The on-off valve 14 is configured as an electromagnetically operated valve biased to the open position O by a spring 15a or 15b.
A, 14b operating circuits 16 are connected to the swash plate (not shown) of the hydraulic pump 6 that operates the continuously variable transmission 8 through a swash plate operating rotation shaft (not shown) to detect the swash plate angle. It is configured to be linked to a potentiometer 17 which is interlocked as shown in FIG. The condition is reliably expressed, and the impact at the time of starting and decelerating is suppressed.

すなわち、ポテンシヨメータ１７による出力値
が設定値に在ると、斜板角が中立用のものに在る
と判断するように、かつ、ポテンシヨメータ１７
による出力値と前記設定値とに差が在ると斜板角
が伝動用のものに在ると判断するように、さら
に、ポテンシヨメータ１７による出力値が前記設
定値より大又は小のいずれに在るかを知つて斜板
角が前進側のものと後進側のもののいずれに在る
かを判断するようにしてある。 That is, when the output value of the potentiometer 17 is at the set value, it is determined that the swash plate angle is at the neutral value, and the potentiometer 17
If there is a difference between the output value of the potentiometer 17 and the set value, it is determined that the swash plate angle is for transmission. By knowing whether the swash plate angle is on the forward or reverse side, it is determined whether the swash plate angle is on the forward or reverse side.

そして、上記操作回路１６は、前記ポテンシヨ
メータ１７と、一対の開閉弁１４ａ，１４ｂ夫々
の電磁ソレノイド操作部１８ａ又は１８ｂとを第
３図に示す如く連係した抵抗器１９、比較器２０
及びトランジスタ２１から成り、一対の開閉弁１
４ａ，１４ｂを次の如く操作するように構成して
ある。 The operation circuit 16 includes a resistor 19 and a comparator 20 which are connected to the potentiometer 17 and the electromagnetic solenoid operation section 18a or 18b of each of the pair of on-off valves 14a and 14b as shown in FIG.
and a transistor 21, a pair of on-off valves 1
4a and 14b are configured to operate as follows.

すなわち、斜板角が中立及びこれの付近に相当
する設定値に在ると、第１図に示すように、一対
の前記油路１０ａ，１０ｂの夫々が変速装置ケー
ス１１に連通し、ポンプ６からの供給圧油が排油
路１２ａ又は１２ｂから変速装置ケース１１に戻
つてモータ７が停止するように、かつ、モータ７
からの戻り油が排油路１２ａ又は１２ｂを通つて
変速装置ケース１１に排出されるように、一対の
開閉弁１４ａ，１４ｂの夫々を開位置Ｏに操作す
るのである。そして、斜板角が前記設定値より高
速側の値に在ると、第２図に示すように、ポンプ
６からの圧油がモータ７に供給されるように、か
つ、モータ７からの戻り油が排油路１２ａ又は１
２ｂを通して変速装置ケース１１に排出されるよ
うに一対の前記油路１０ａ，１０ｂのうち、供給
側のもの１０ａ又は１０ｂに対する開閉弁１４ａ
又は１４ｂを閉位置Ｃに操作すると共に、一対の
前記油路１０ａ，１０ｂのうち戻り側のもの１０
ｂ又は１０ａに対する開閉弁１４ｂ又は１４ａを
開位置Ｏにするのである。 That is, when the swash plate angle is at a set value corresponding to neutral or near neutral, each of the pair of oil passages 10a, 10b communicates with the transmission case 11, and the pump 6 so that the pressure oil supplied from
Each of the pair of on-off valves 14a and 14b is operated to the open position O so that the oil returned from the engine is discharged into the transmission case 11 through the oil drain path 12a or 12b. When the swash plate angle is on the higher speed side than the set value, as shown in FIG. Oil drains through oil drain path 12a or 1
An on-off valve 14a for the supply side oil passage 10a or 10b of the pair of oil passages 10a, 10b so as to be discharged into the transmission case 11 through the oil passage 2b.
or 14b to the closed position C, and the return side 10 of the pair of oil passages 10a, 10b.
The on-off valve 14b or 14a for b or 10a is set to the open position O.

〔別実施例〕[Another example]

前記ポテンシヨメータ１７を機械式検出構成
に、前記操作回路１６を機械式連動構成に夫々替
えて実施してもよく、ポテンシヨメータ１７をセ
ンサー１７と称し、操作回路１６を自動操作機構
１６と称する。 The potentiometer 17 may be replaced with a mechanical detection configuration, and the operating circuit 16 may be replaced with a mechanical interlocking configuration. to be called.

本発明は、農用トラクターの他にコンバイン等
の各種農作業車や運搬車等の各種車輌にも適用で
きる。 The present invention is applicable not only to agricultural tractors but also to various vehicles such as various agricultural vehicles such as combines and transport vehicles.

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

図面は本発明に係る走行用伝動装置の実施例を
示し、第１図は無段変速装置中立状態の油圧回路
図、第２図は無段変速装置伝動状態の油圧回路
図、第３図は電気回路図、第４図は農用トラクタ
ーの全体側面図である。第５図は従来変速装置の
油圧回路図である。 ６……油圧ポンプ、７……油圧モータ、８……
無段変速装置、１０ａ，１０ｂ……油路、１１…
…タンク、１３……絞り部、１４ａ，１４ｂ……
開閉弁、１６……自動操作機構、１７……センサ
ー。 The drawings show an embodiment of the driving transmission device according to the present invention, FIG. 1 is a hydraulic circuit diagram of the continuously variable transmission in a neutral state, FIG. 2 is a hydraulic circuit diagram of the continuously variable transmission in the transmission state, and FIG. 3 is a hydraulic circuit diagram of the continuously variable transmission in the transmission state. The electric circuit diagram, FIG. 4, is an overall side view of the agricultural tractor. FIG. 5 is a hydraulic circuit diagram of a conventional transmission. 6...Hydraulic pump, 7...Hydraulic motor, 8...
Continuously variable transmission, 10a, 10b... oil passage, 11...
...tank, 13... throttle section, 14a, 14b...
Opening/closing valve, 16... automatic operation mechanism, 17... sensor.

Claims (1)

【特許請求の範囲】 １ 油圧ポンプ６と油圧モータ７とから成る走行
用無段変速装置８を設けると共に、前記ポンプ６
と前記モータ７を接続する一対の油路１０ａ，１
０ｂ夫々に、この油路１０ａ又は１０ｂをタンク
１１に連通させる開位置Ｏとこの連通を断つ閉位
置Ｃとに切換え自在な開閉弁１４ａ又は１４ｂ
を、前記開位置に絞り部１３を備えさせた状態で
設けた走行用伝動装置であつて、前記油圧ポンプ
６における斜板の角度を検出するセンサー１７を
設けると共に、前記油圧ポンプ６の吐出力が零と
なる前記角度の中立及びこれの付近に相当する設
定値であると自動的に一対の前記油路１０ａ，１
０ｂが共に対タンク連通状態となり、前記油圧モ
ータ７が駆動停止した前記無段変速装置８の中立
状態が現出されるように、かつ、前記角度が前記
設定値より高速側に相当する値にあると、自動的
に一対の前記油路１０ａ，１０ｂのうちの供給側
が対タンク非連通状態で戻り側が対タンク連通状
態となり、前記油圧モータ７が駆動されて前記無
段変速装置８の作動状態が現出されるように、前
記センサー１７からの情報に基いて一対の前記開
閉弁１４ａ，１４ｂを自動操作する機構１６を設
けてある走行用伝動装置。 ２ 前記自動操作機構１６が電気式機構である特
許請求の範囲第１項に記載の走行用伝動装置。[Claims] 1. A continuously variable transmission device 8 for traveling consisting of a hydraulic pump 6 and a hydraulic motor 7 is provided, and the pump 6
and a pair of oil passages 10a, 1 connecting the motor 7.
0b, an on-off valve 14a or 14b that can be freely switched between an open position O that communicates this oil passage 10a or 10b with the tank 11 and a closed position C that disconnects this communication.
is a traveling transmission device provided with a constriction portion 13 in the open position, and is provided with a sensor 17 for detecting the angle of the swash plate in the hydraulic pump 6, and also includes a sensor 17 for detecting the angle of the swash plate in the hydraulic pump 6. When the setting value corresponds to the neutral position of the angle and the vicinity thereof, where the angle becomes zero, the pair of oil passages 10a, 1
0b are both in communication with the tank, the hydraulic motor 7 is in a neutral state of the continuously variable transmission 8 in which driving is stopped, and the angle is set to a value corresponding to a higher speed side than the set value. If so, the supply side of the pair of oil passages 10a, 10b will automatically be in a non-communicating state with the tank and the return side will be in a communicating state with the tank, and the hydraulic motor 7 will be driven to change the operating state of the continuously variable transmission 8. The traveling transmission device is provided with a mechanism 16 that automatically operates the pair of on-off valves 14a and 14b based on information from the sensor 17 so that 2. The traveling transmission device according to claim 1, wherein the automatic operation mechanism 16 is an electric mechanism.
JP16130484A 1984-07-30 1984-07-30 Travelling transmission unit Granted JPS6137540A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16130484A JPS6137540A (en) 1984-07-30 1984-07-30 Travelling transmission unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16130484A JPS6137540A (en) 1984-07-30 1984-07-30 Travelling transmission unit

Publications (2)

Publication Number Publication Date
JPS6137540A JPS6137540A (en) 1986-02-22
JPH0254248B2 true JPH0254248B2 (en) 1990-11-21

Family

ID=15732561

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16130484A Granted JPS6137540A (en) 1984-07-30 1984-07-30 Travelling transmission unit

Country Status (1)

Country Link
JP (1) JPS6137540A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10720381B2 (en) 2017-03-21 2020-07-21 Kabushiki Kaisha Toshiba Semiconductor device and method of manufacturing the same

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0721315B2 (en) * 1987-10-13 1995-03-08 本田技研工業株式会社 Clutch control method for continuously variable transmission for vehicle
JPH01108467A (en) * 1987-10-22 1989-04-25 Honda Motor Co Ltd Controller for continuously variable hydraulic transmission of vehicle
JPH11201278A (en) * 1998-01-12 1999-07-27 Komatsu Ltd Running driving device of hydraulic driving type working vehicle and its control method
DE10105284A1 (en) 2001-02-06 2002-08-29 Infineon Technologies Ag Microprocessor circuit for data carriers and method for organizing access to data stored in a memory
US8020659B2 (en) 2007-11-28 2011-09-20 Caterpillar Paving Products Inc. Hydrostatically driven vehicle and method therefor
US20140199930A1 (en) * 2011-08-20 2014-07-17 National University Corporation Nagoya University Vehicle grille

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4918045A (en) * 1972-06-09 1974-02-18

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4918045A (en) * 1972-06-09 1974-02-18

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10720381B2 (en) 2017-03-21 2020-07-21 Kabushiki Kaisha Toshiba Semiconductor device and method of manufacturing the same

Also Published As

Publication number Publication date
JPS6137540A (en) 1986-02-22

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