JP3010440U - Hydraulic clutch multiple coupling prevention mechanism - Google Patents
Hydraulic clutch multiple coupling prevention mechanismInfo
- Publication number
- JP3010440U JP3010440U JP1994012942U JP1294294U JP3010440U JP 3010440 U JP3010440 U JP 3010440U JP 1994012942 U JP1994012942 U JP 1994012942U JP 1294294 U JP1294294 U JP 1294294U JP 3010440 U JP3010440 U JP 3010440U
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- speed
- hydraulic clutch
- oil passage
- clutch
- 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
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Abstract
(57)【要約】
【目的】 シフト操作の際の油圧クラッチの多重結合
と、非結合状態となる過渡期間の発生を防止し車両の作
業性能を向上させる。
【構成】 油圧源５と複数の速度段の油圧クラッチ１、
２、３、４との間に、油圧クラッチの何れか一つを選択
して接続切換を行う複数の油圧クラッチ選択弁１１、１
２、１３を設けた接続切換装置において、油圧源５か
ら、一速の油圧クラッチ選択弁１１への一速加圧油路５
１と、油圧クラッチ選択弁１２、１３への共通加圧油路
５２とを並列に設け、共通加圧油路５２の途中に油圧パ
イロット式遮断弁６を設け、一速の油圧クラッチ選択弁
と一速の油圧クラッチとの間の油路から分岐したパイロ
ット油路６１を油圧パイロット式遮断弁６のパイロット
ポートに接続し、油圧クラッチの切換操作時に接続され
る油圧クラッチ選択弁と遮断される油圧クラッチ選択弁
との作動開始に時間差を与える制御手段７を設ける。
(57) [Summary] [Purpose] To improve the work performance of the vehicle by preventing the multiple engagement of the hydraulic clutch during the shift operation and the occurrence of the transition period in which the hydraulic clutch is disengaged. [Structure] Hydraulic power source 5 and hydraulic clutches 1 at a plurality of speed stages,
A plurality of hydraulic clutch selection valves 11 and 1 that perform connection switching by selecting one of the hydraulic clutches between 2, 3 and 4.
In the connection switching device provided with Nos. 2 and 13, the first speed pressurized oil passage 5 from the hydraulic pressure source 5 to the first speed hydraulic clutch selection valve 11 is provided.
1 and a common pressure oil passage 52 to the hydraulic clutch selection valves 12 and 13 are provided in parallel, and a hydraulic pilot type cutoff valve 6 is provided in the middle of the common pressure oil passage 52 to provide a first speed hydraulic clutch selection valve. The pilot oil passage 61 branched from the oil passage between the first speed hydraulic clutch is connected to the pilot port of the hydraulic pilot type cutoff valve 6, and the hydraulic clutch selection valve connected at the time of switching operation of the hydraulic clutch is cut off from the hydraulic pressure. A control means 7 is provided for giving a time difference to the operation start with the clutch selection valve.
Description
【０００１】[0001]
本考案は、建設車両等の油圧クラッチの接続切換装置において、油圧クラッチ の多重結合による損傷を防止する機構に関する。 The present invention relates to a mechanism for preventing damage due to multiple coupling of hydraulic clutches in a connection switching device for hydraulic clutches of construction vehicles and the like.
【０００２】[0002]
従来、建設車両等の油圧クラッチの接続切換装置では、複数の速度段の油圧ク ラッチの何れかを選択して接続切換を行うための複数の油圧クラッチ選択弁を油 圧源から全て並列に接続していたので、油圧クラッチ選択弁の動作不良、固着等 の不具合が発生すると、接続切換えを行った際に油圧クラッチが多重結合してク ラッチ部品の損傷を生ずるおそれがあった。 Conventionally, in connection switching devices for hydraulic clutches of construction vehicles, etc., all hydraulic clutch selection valves for selecting one of hydraulic clutches at multiple speed stages to perform connection switching are connected in parallel from an oil pressure source. Therefore, if a malfunction such as a malfunction or sticking of the hydraulic clutch selection valve occurs, there is a risk that the hydraulic clutch will be multiple-connected when the connection is switched and the clutch components will be damaged.
【０００３】 そこで、例えば図４に示すように、複数の速度段の油圧クラッチ１、２、３、 ４の何れか一つを選択して接続切換を行うための複数の油圧クラッチ選択弁１１ 、１２、１３を油圧源５から直列に接続し、常に何れか一つの油圧クラッチのみ 加圧接続可能な油圧回路構成にした油圧クラッチの多重結合防止機構が用いられ るようになった。Therefore, for example, as shown in FIG. 4, a plurality of hydraulic clutch selection valves 11 for selecting one of the hydraulic clutches 1, 2, 3, 4 of a plurality of speed stages to switch the connection, A multiple coupling preventing mechanism for hydraulic clutches has been used in which the hydraulic clutches 12 and 13 are connected in series from the hydraulic power source 5 and only one of the hydraulic clutches is constantly pressurized and connected.
【０００４】[0004]
例えば、建設車両が二速の速度段を選択して押土作業もしくは急傾斜面の登坂 のような負荷の大きい作業を行っているとき、走行負荷が増大して走行が困難に なった場合には、通常一速へシフトダウンして牽引力の増大を図る。しかし、図 ４に示すような油圧回路構成にした油圧クラッチの多重結合防止機構では、接続 する油圧クラッチを二速の油圧クラッチ２から一速の油圧クラッチ１へ切換える とき、二速の油圧クラッチ２の油圧力Ｐ2 と一速の油圧クラッチ１の油圧力Ｐ1 とが、図５に示すように、時間ｔ軸に対して異なる傾斜で変化するので、二速の 油圧クラッチの油圧力Ｐ2 が限界圧Ｐt 以下となってから一速の油圧クラッチ１ の油圧力Ｐ1 が限界圧Ｐt を越えるまでの時間ｔ1 は、二速の油圧クラッチ２と 一速の油圧クラッチ１とが同時に遮断状態となって牽引力が断たれる過渡期間と なる。このとき、建設車両は押土作業もしくは急傾斜面の登坂により、土砂の抵 抗や車両の自重によって進行方向とは逆方向の外力を受けているので、前進状態 を継続させたいのに一時的な後退が生ずる等、円滑な作業が阻害されるという問 題があった。For example, when the construction vehicle selects the second speed stage and is performing heavy work such as embankment work or climbing a steep slope, the traveling load increases and it becomes difficult to travel. Usually shifts down to first gear to increase traction. However, in the hydraulic clutch multiple coupling prevention mechanism having the hydraulic circuit configuration as shown in FIG. 4, when switching the connected hydraulic clutch from the second speed hydraulic clutch 2 to the first speed hydraulic clutch 1, the second speed hydraulic clutch 2 is connected. oil pressure P 2 and the oil pressure P 1 one speed hydraulic clutch 1, as shown in FIG. 5, since changes in different inclination with respect to the time t axis, oil pressure of the second-speed hydraulic clutch P 2 There time t 1 until oil pressure P 1 of the hydraulic clutch 1 single speed from when below the limit pressure P t exceeds the limit pressure P t, the double-speed hydraulic clutch 2 and the hydraulic clutch 1 one speed is At the same time, it becomes a cutoff state, and the transitional period is reached when the traction force is cut off. At this time, the construction vehicle is receiving an external force in the direction opposite to the traveling direction due to earth and sand resistance and the vehicle's own weight due to the work of pushing the soil or climbing the steep slope. However, there was a problem that smooth work was hindered, such as a sudden retreat.
【０００５】 なお、この傾斜特性は、油圧クラッチ未接続時のひきずり発生を防止するため に通常設けられる一定量のクラッチ切れ代容積及びクラッチ材の弾性変形容積分 だけ油の出入りが生ずることに起因するものである。 本考案は、油圧クラッチの多重結合防止機構におけるかかる問題を解決するも のであって、油圧クラッチの多重結合によるクラッチ部品の損傷を防止すると共 に、車両の走行及び作業性能を向上させることのできる油圧クラッチの多重結合 防止機構を提供することを目的とする。Note that this inclination characteristic is caused by the oil entering and leaving by a fixed amount of the clutch disengagement allowance volume and the elastic deformation volume of the clutch material, which are usually provided to prevent dragging when the hydraulic clutch is not connected. To do. The present invention solves such a problem in the hydraulic clutch multiple coupling preventing mechanism, and can prevent the damage of the clutch components due to the hydraulic clutch multiple coupling, and at the same time, improve the running and working performance of the vehicle. An object is to provide a mechanism for preventing multiple coupling of hydraulic clutches.
【０００６】[0006]
本考案は、油圧源と複数の速度段の油圧クラッチとの間に、複数の速度段の油 圧クラッチの何れか一つを選択して接続切換を行うための複数の油圧クラッチ選 択弁を設けた油圧クラッチの接続切換装置において、油圧源から、一速の油圧ク ラッチ選択弁への一速加圧油路と、その他の油圧クラッチ選択弁への共通加圧油 路とを並列に設け、この共通加圧油路の途中に油圧パイロット式遮断弁を設け、 一速の油圧クラッチ選択弁と一速の油圧クラッチとの間の一速加圧油路から分岐 したパイロット油路を前記油圧パイロット式遮断弁のパイロットポートに接続す ると共に、油圧クラッチの切換操作時に接続される油圧クラッチ選択弁と遮断さ れる油圧クラッチ選択弁との作動開始に所定の時間差を与える制御手段を設ける ことにより上記課題を解決している。 The present invention provides a plurality of hydraulic clutch selection valves between the hydraulic power source and the hydraulic clutches of a plurality of speed stages to select one of the hydraulic clutches of a plurality of speed stages for connection switching. In the provided connection switching device for the hydraulic clutch, the first-speed pressurizing oil passage from the hydraulic source to the first-speed hydraulic clutch selection valve and the common pressurizing oil passage to the other hydraulic clutch selection valves are provided in parallel. , A hydraulic pilot type shutoff valve is provided in the middle of this common pressurizing oil passage, and the pilot oil passage branched from the first speed pressurizing oil passage between the first speed hydraulic clutch selection valve and the first speed hydraulic clutch is By connecting to the pilot port of the pilot shutoff valve and providing a control means that gives a predetermined time difference between the operation start of the hydraulic clutch selection valve that is connected when switching the hydraulic clutch and the hydraulic clutch selection valve that is shut off. the above It has solved the problem.
【０００７】[0007]
車両が負荷の大きい作業等を行っているとき、走行負荷が増大して走行が困難 になった場合に、一速へシフトダウン操作を行うと、制御手段により、まず一速 の油圧クラッチ選択弁が接続側へ切換えられ、所定時間後にそれまで接続されて いた油圧クラッチ選択弁が遮断側へ切換えられるので、この油圧クラッチの油圧 力が限界圧以下となってから一速の油圧クラッチの油圧力が限界圧を越えるまで の時間は、実質的に０となり、両方の油圧クラッチが同時に遮断状態となって牽 引力が断たれる過渡期間の発生が防止され、一時的な後退等により円滑な作業が 阻害されることはない。 When the vehicle is performing heavy work or the like, and the traveling load becomes heavy and traveling becomes difficult, if the shift down operation is performed to the first speed, the control means first causes the hydraulic clutch selection valve for the first speed to operate. Is switched to the connection side, and the hydraulic clutch selection valve that has been connected until then is switched to the disconnection side after a predetermined time.Therefore, the hydraulic pressure of the first speed hydraulic clutch is reduced after the hydraulic force of this hydraulic clutch falls below the limit pressure. Until the pressure exceeds the limit pressure is substantially 0, the transitional period in which both hydraulic clutches are simultaneously in the disengaged state and the pulling force is cut off is prevented, and smooth work is performed due to temporary retraction. Will not be hindered.
【０００８】 また、仮に、油圧クラッチ選択弁の動作不良、固着等の不具合が発生したとし ても、一速の油圧クラッチ選択弁が接続側へ切換えられて一速の油圧クラッチの 油圧力が限界圧を越えると、油圧パイロット式遮断弁が遮断側へ切換えられ共通 加圧油路が遮断されるので、クラッチが多重結合したままの状態となってクラッ チ部品の損傷を生ずるおそれはない。Further, even if a malfunction such as a malfunction or sticking of the hydraulic clutch selection valve occurs, the hydraulic clutch selection valve of the first speed is switched to the connection side and the hydraulic pressure of the hydraulic clutch of the first speed is limited. When the pressure is exceeded, the hydraulic pilot type shutoff valve is switched to the shutoff side and the common pressure oil passage is shut off, so there is no risk of the clutch parts remaining in the multiple engaged state and damage to the clutch parts.
【０００９】[0009]
図１は本考案の一実施例である油圧クラッチの多重結合防止機構の構成を示す 回路図、図２は油圧クラッチの油圧力変化を示す特性図である。 本実施例では、油圧源５と、一速の油圧クラッチ１、二速の油圧クラッチ２、 三速の油圧クラッチ３、及び四速の油圧クラッチ４との間に、一速の油圧クラッ チ選択弁１１、二速の油圧クラッチ選択弁１２、三速の油圧クラッチ選択弁１３ が設けられている。ここで、油圧源５から、一速の油圧クラッチ選択弁１１への 一速加圧油路５１と、一速以外の油圧クラッチ選択弁への共通加圧油路５２とが 並列に設けられ、共通加圧油路５２は二速の油圧クラッチ選択弁１２に接続され ている。二速の油圧クラッチ選択弁１２は二位置の電磁切換弁であり、ソレノイ ド１２ａの励磁により切換えられると油圧源５と二速の油圧クラッチ２とが連通 され、非励磁のノーマル位置では、共通加圧油路５２が二速の油圧クラッチ選択 弁１２を経て三速の油圧クラッチ選択弁１３に接続される。 FIG. 1 is a circuit diagram showing a structure of a multiple coupling preventing mechanism for a hydraulic clutch according to an embodiment of the present invention, and FIG. 2 is a characteristic diagram showing changes in hydraulic pressure of the hydraulic clutch. In this embodiment, the first speed hydraulic clutch is selected between the hydraulic power source 5 and the first speed hydraulic clutch 1, the second speed hydraulic clutch 2, the third speed hydraulic clutch 3 and the fourth speed hydraulic clutch 4. A valve 11, a second speed hydraulic clutch selection valve 12, and a third speed hydraulic clutch selection valve 13 are provided. Here, a first speed pressurizing oil passage 51 from the hydraulic power source 5 to the first speed hydraulic clutch selecting valve 11 and a common pressurizing oil passage 52 to the hydraulic clutch selecting valves other than the first speed are provided in parallel, The common pressurizing oil passage 52 is connected to the second speed hydraulic clutch selection valve 12. The second-speed hydraulic clutch selection valve 12 is a two-position electromagnetic switching valve, and when switched by energizing the solenoid 12a, the hydraulic source 5 and the second-speed hydraulic clutch 2 are in communication, and in the non-excited normal position, they are common. The pressurized oil passage 52 is connected to the third speed hydraulic clutch selection valve 13 via the second speed hydraulic clutch selection valve 12.
【００１０】 三速の油圧クラッチ選択弁１３は三位置の電磁切換弁であり、三速側のソレノ イド１３ａが励磁されると油圧源５と三速の油圧クラッチ３とが連通し、四速側 のソレノイド１３ｂが励磁されると油圧源５と四速の油圧クラッチ４とが連通す るように切換えられる。 一速の油圧クラッチ選択弁１１は二位置の電磁切換弁であり、ソレノイド１１ ａの励磁により切換えられると油圧源５と一速の油圧クラッチ１とが連通され、 非励磁のノーマル位置では、一速加圧油路５１は遮断されている。The third-speed hydraulic clutch selection valve 13 is a three-position electromagnetic switching valve. When the solenoid 13a on the third speed side is excited, the hydraulic source 5 and the third-speed hydraulic clutch 3 communicate with each other, and the fourth speed When the solenoid 13b on the side is excited, the hydraulic power source 5 and the hydraulic clutch 4 of the fourth speed are switched to communicate with each other. The first-speed hydraulic clutch selection valve 11 is a two-position electromagnetic switching valve. When switched by exciting the solenoid 11a, the hydraulic source 5 and the first-speed hydraulic clutch 1 are in communication with each other. The quick pressurizing oil passage 51 is shut off.
【００１１】 油圧源５と二速の油圧クラッチ選択弁１２との間の共通加圧油路５２の途中に は、油圧パイロット式遮断弁６が設けられており、一速の油圧クラッチ選択弁１ １と一速の油圧クラッチ１との間の一速加圧油路５１から分岐したパイロット油 路６１が油圧パイロット式遮断弁６のパイロットポートに接続されている。 一速の油圧クラッチ１、二速の油圧クラッチ２、三速の油圧クラッチ３、及び 四速の油圧クラッチ４は、油圧源５と連通すると油室に圧油が供給されるので結 合状態となる。また、一速の油圧クラッチ１、二速の油圧クラッチ２、三速の油 圧クラッチ３、及び四速の油圧クラッチ４は、それぞれリターンスプリング１ｓ 、２ｓ、３ｓ、４ｓを備えており、油圧源５との連通が遮断されると、油室から 作動油が排出されて非結合の状態に戻る。A hydraulic pilot type shutoff valve 6 is provided in the middle of the common pressurizing oil passage 52 between the hydraulic power source 5 and the second speed hydraulic clutch selection valve 12, and the first speed hydraulic clutch selection valve 1 is provided. A pilot oil passage 61 branched from a first-speed pressurizing oil passage 51 between the first-speed hydraulic clutch 1 and the first-speed hydraulic clutch 1 is connected to a pilot port of the hydraulic pilot shutoff valve 6. The first-speed hydraulic clutch 1, the second-speed hydraulic clutch 2, the third-speed hydraulic clutch 3, and the fourth-speed hydraulic clutch 4 are connected to each other because the hydraulic oil is supplied to the oil chamber when communicating with the hydraulic source 5. Become. The first speed hydraulic clutch 1, the second speed hydraulic clutch 2, the third speed hydraulic clutch 3 and the fourth speed hydraulic clutch 4 are provided with return springs 1s, 2s, 3s and 4s, respectively. When the communication with 5 is cut off, hydraulic oil is discharged from the oil chamber and returns to the uncoupled state.
【００１２】 油圧源５とタンク５３との間には、調圧弁５４が設けられており、この調圧弁 ５４により各油圧クラッチ１、２、３、４に共通の常用油圧力Ｐｈが設定されて いる。 一速の油圧クラッチ選択弁１１、二速の油圧クラッチ選択弁１２、三速の油圧 クラッチ選択弁１３の各ソレノイド１１ａ、１２ａ、１３ａ、１３ｂは、制御器 ７の出力部７３に接続されており、制御器７の入力部７１は切換操作スイッチ８ に接続されている。A pressure regulating valve 54 is provided between the hydraulic power source 5 and the tank 53. The pressure regulating valve 54 sets a common working oil pressure Ph common to the respective hydraulic clutches 1, 2, 3, 4. There is. The solenoids 11a, 12a, 13a, 13b of the first speed hydraulic clutch selection valve 11, the second speed hydraulic clutch selection valve 12, and the third speed hydraulic clutch selection valve 13 are connected to the output section 73 of the controller 7. The input section 71 of the controller 7 is connected to the changeover operation switch 8.
【００１３】 切換操作スイッチ８は一速、二速、三速、四速の速度段の選択切換の操作を行 う手動の操作スイッチであり、オペレータが速度段を選択するとその選択速度段 信号が制御器７の入力部７１へ送られる。制御器７では、入力部７１に選択速度 段信号が入力されると、接続される油圧クラッチ選択弁と遮断される油圧クラッ チ選択弁との作動開始の時間差を処理部７２で求め、出力部７３から選択された ソレノイドへ出力する。The changeover operation switch 8 is a manual operation switch for performing an operation of selecting and changing the speed stage of the first speed, the second speed, the third speed, and the fourth speed. When the operator selects the speed stage, the selected speed stage signal is transmitted. It is sent to the input unit 71 of the controller 7. In the controller 7, when the selected speed stage signal is input to the input unit 71, the processing unit 72 determines the time difference between the operation start of the connected hydraulic clutch selection valve and the disconnection of the hydraulic clutch selection valve, and the output unit Output from 73 to the selected solenoid.
【００１４】 この実施例の油圧クラッチの多重結合防止機構を備えた建設車両が、二速で負 荷の大きい作業を行っているときには、ソレノイド１２ａが通電されて励磁し、 二速の油圧クラッチ選択弁１２が切換えられて二速の油圧クラッチ２が油圧源５ と連通して結合した状態になっている。走行負荷が増大して走行が困難になった 場合に、切換操作スイッチ８で一速へのシフトダウン操作を行うと、制御器７は ソレノイド１２ａへの通電を停止し、ソレノイド１１ａへの通電を行う。When a construction vehicle equipped with the hydraulic clutch multiple coupling prevention mechanism of this embodiment is performing a heavy load work at the second speed, the solenoid 12a is energized and excited to select the second speed hydraulic clutch. The valve 12 is switched so that the second speed hydraulic clutch 2 is in communication with and connected to the hydraulic power source 5. When the traveling load is increased and traveling becomes difficult, when the shift operation switch 8 is operated to shift down to the first speed, the controller 7 stops energizing the solenoid 12a and energizes the solenoid 11a. To do.
【００１５】 このとき、制御器７は、図２に示すように、まずソレノイド１１ａへの通電を 開始し、処理部７２で求めた時間差ｔ2 （通常０．５秒以下）が経過した後、ソ レノイド１２ａへの通電を停止する。このように制御することにより、まず一速 の油圧クラッチ選択弁１１が接続側へ切換えられ、時間ｔ2 後にそれまで接続さ れていた二速の油圧クラッチ選択弁１２が遮断側へ切換えられるので、二速の油 圧クラッチ２の油圧力Ｐ2 が限界圧Ｐt 以下となってから一速の油圧クラッチ１ の油圧力Ｐ1 が限界圧Ｐt を越えるまでの時間ｔ1 は、実質的に０となる。従っ て、両方の油圧クラッチが同時に非結合状態となって牽引力が断たれる過渡期間 の発生が防止されるので、一時的な後退等により円滑な作業が阻害されることは ない。At this time, as shown in FIG. 2, the controller 7 first starts energizing the solenoid 11a, and after the time difference t 2 (usually 0.5 seconds or less) obtained by the processing unit 72 has elapsed, The power supply to the solenoid 12a is stopped. By controlling in this way, first the hydraulic clutch selection valve 11 for the first speed is switched to the connection side, and after the time t 2 , the hydraulic clutch selection valve 12 for the second speed, which has been connected until then, is switched to the disconnection side. , the time t 1 until oil pressure P 1 of the hydraulic clutch 1 single-speed hydraulic force P 2 of the hydraulic clutch 2 of a two-speed from becomes less critical pressure P t exceeds the limit pressure P t is substantially Becomes 0. Therefore, both hydraulic clutches are disengaged at the same time and the transitional period in which the traction force is cut off is prevented, so smooth work is not hindered by temporary retreat.
【００１６】 三速や四速による走行の際には、ソレノイド１３ａ、又はソレノイド１３ｂが 通電されて励磁し、三速の油圧クラッチ選択弁１３が切換えられて三速の油圧ク ラッチ３、又は四速の油圧クラッチ４が油圧源５と連通して結合した状態になっ ている。この状態から一速へのシフトダウン操作を行ったときにも同様に過渡期 間の発生を防止することができる。When traveling in the third speed or the fourth speed, the solenoid 13a or the solenoid 13b is energized and excited, and the hydraulic clutch selection valve 13 of the third speed is switched to change the hydraulic clutch 3 or the fourth speed of the third speed. The high speed hydraulic clutch 4 is in communication with and connected to the hydraulic power source 5. Even when a shift down operation from this state to the first speed is performed, the occurrence of the transition period can be similarly prevented.
【００１７】 また、油圧パイロット式遮断弁６の動作圧力は限界圧Ｐt と等しく設定されて おり、一速の油圧クラッチ１の油圧力Ｐ1 が限界圧Ｐt を越えると、油圧パイロ ット式遮断弁６が共通加圧油路５２を遮断するので、仮に、一速以外の油圧クラ ッチ選択弁１２、１３、１４の動作不良、固着等の不具合が発生したとしても、 クラッチが多重結合したままの状態となってクラッチ部品の損傷を生ずるおそれ はない。Further, the operating pressure of the hydraulic pilot type cut-off valve 6 is set equal to the critical pressure P t, the oil pressure P 1 of the hydraulic clutch 1 single speed exceeds the limit pressure P t, hydraulic Pilot Since the type shutoff valve 6 shuts off the common pressurizing oil passage 52, even if a malfunction such as a malfunction or sticking of the hydraulic clutch selection valves 12, 13, 14 other than the first speed occurs, the clutch is redundant. There is no risk of the clutch parts being damaged as they remain engaged.
【００１８】 一方、一速から他の速度段へシフトアップ操作を行ったとき、一速の油圧クラ ッチ選択弁１１や油圧パイロット式遮断弁６が動作不良、固着等の不具合が発生 したと場合には、一速の油圧クラッチ１のみが接続されるので多重結合は防止さ れる。二速、三速、四速間のシフトの場合は従来の多重結合機構と同様である。 図３は、他の実施例の構成を示す回路図である。On the other hand, when a shift-up operation is performed from the first speed to another speed stage, a malfunction such as malfunction or sticking of the first-speed hydraulic clutch selection valve 11 or the hydraulic pilot shutoff valve 6 occurs. In this case, only the first speed hydraulic clutch 1 is engaged, so that multiple engagement is prevented. In the case of shifting between second speed, third speed, and fourth speed, it is the same as the conventional multiple coupling mechanism. FIG. 3 is a circuit diagram showing the configuration of another embodiment.
【００１９】 この実施例では、油圧源５からの一速加圧油路５１に設けられた一速の油圧ク ラッチ選択弁１１は三位置の電磁切換弁であり、この一速の油圧クラッチ選択弁 １１に一速の油圧クラッチ１と三速の油圧クラッチ３とが接続されていて、一速 側のソレノイド１１ａが励磁されると油圧源５と一速の油圧クラッチ１とが連通 し、三速側のソレノイド１１ｂが励磁されると油圧源５と三速の油圧クラッチ３ とが連通するように切換えられる。In this embodiment, the first-speed hydraulic clutch selection valve 11 provided in the first-speed pressurized oil passage 51 from the hydraulic power source 5 is a three-position electromagnetic switching valve. A first-speed hydraulic clutch 1 and a third-speed hydraulic clutch 3 are connected to the valve 11, and when the first-speed side solenoid 11a is excited, the hydraulic source 5 and the first-speed hydraulic clutch 1 are in communication with each other. When the solenoid 11b on the high speed side is excited, the hydraulic power source 5 and the hydraulic clutch 3 on the third speed are switched to communicate with each other.
【００２０】 また、油圧源５からの共通加圧油路５２に設けられた二速の油圧クラッチ選択 弁１２は三位置の電磁切換弁であり、この二速の油圧クラッチ選択弁１２に二速 の油圧クラッチ２と四速の油圧クラッチ４とが接続されていて、二速側のソレノ イド１２ａが励磁されると油圧源５と二速の油圧クラッチ２とが連通し、四速側 のソレノイド１２ｂが励磁されると油圧源５と四速の油圧クラッチ４とが連通す るように切換えられる。The second speed hydraulic clutch selection valve 12 provided in the common pressure oil passage 52 from the hydraulic power source 5 is a three-position electromagnetic switching valve. Hydraulic clutch 2 and fourth speed hydraulic clutch 4 are connected, and when second speed solenoid 12a is excited, hydraulic source 5 and second speed hydraulic clutch 2 communicate, and fourth speed solenoid is connected. When 12b is excited, the hydraulic power source 5 and the fourth speed hydraulic clutch 4 are switched so as to communicate with each other.
【００２１】 油圧源５と二速の油圧クラッチ選択弁１２との間の共通加圧油路５２の途中に は、油圧パイロット式遮断弁６が設けられており、一速の油圧クラッチ選択弁１ １と一速の油圧クラッチ１との間の一速加圧油路５１から分岐したパイロット油 路６１と、一速の油圧クラッチ選択弁１１と三速の油圧クラッチ３との間の三速 加圧油路３１から分岐したパイロット油路６２とがシャトル弁９を介して油圧パ イロット式遮断弁６のパイロットポートに接続されている。A hydraulic pilot type shutoff valve 6 is provided in the middle of the common pressurizing oil passage 52 between the hydraulic power source 5 and the second speed hydraulic clutch selection valve 12, and the first speed hydraulic clutch selection valve 1 The pilot oil passage 61 branched from the first speed pressurizing oil passage 51 between the first speed hydraulic clutch 1 and the first speed hydraulic clutch 1, and the third speed application between the first speed hydraulic clutch selection valve 11 and the third speed hydraulic clutch 3. The pilot oil passage 62 branched from the pressure oil passage 31 is connected to the pilot port of the hydraulic pilot type cutoff valve 6 via the shuttle valve 9.
【００２２】 その他の構成は、図１の実施例と同様であり、二速や四速から一速へのシフト ダウン操作を行ったときの他、二速や四速から三速へのシフト操作でも過渡期間 の発生を防止することができる。Other configurations are the same as those of the embodiment of FIG. 1, except that the shift down operation from the second speed or the fourth speed to the first speed is performed, and the shift operation from the second speed or the fourth speed to the third speed is performed. However, it is possible to prevent the occurrence of the transition period.
【００２３】[0023]
以上説明したように、本考案の油圧クラッチの多重結合防止機構は、油圧クラ ッチの多重結合によるクラッチ部品の損傷を防止すると共に、高負荷作業中のシ フト操作の際、油圧クラッチが非結合状態となって牽引力が断たれる過渡期間の 発生が防止されるので、一時的な後退等により円滑な作業が阻害されることがな く、車両の走行及び作業性能を向上させることができる。 As described above, the mechanism for preventing multiple engagement of the hydraulic clutch of the present invention prevents damage to the clutch components due to multiple engagement of the hydraulic clutch, and also prevents the hydraulic clutch from disengaging during shift operation during heavy load work. Since a transitional period in which the traction force is cut off in the coupled state is prevented is prevented, smooth work is not hindered by temporary retreat, etc., and the running and work performance of the vehicle can be improved. .
【図１】本考案の一実施例である油圧クラッチの多重結
合防止機構の構成を示す回路図である。FIG. 1 is a circuit diagram showing a structure of a multiple coupling preventing mechanism for a hydraulic clutch according to an embodiment of the present invention.
【図２】油圧クラッチの油圧力変化を示す特性図であ
る。FIG. 2 is a characteristic diagram showing a change in hydraulic pressure of a hydraulic clutch.
【図３】他の実施例の構成を示す回路図である。FIG. 3 is a circuit diagram showing a configuration of another embodiment.
【図４】従来の油圧クラッチの多重結合防止機構の構成
を示す回路図である。FIG. 4 is a circuit diagram showing a configuration of a conventional multiple coupling preventing mechanism for a hydraulic clutch.
【図５】従来の油圧クラッチの油圧力変化を示す特性図
である。FIG. 5 is a characteristic diagram showing changes in hydraulic pressure of a conventional hydraulic clutch.
１ 一速の油圧クラッチ ２ 二速の油圧クラッチ ３ 三速の油圧クラッチ ４ 四速の油圧クラッチ ５ 油圧源 ６ 油圧パイロット式遮断弁 ７ 制御器 ８ 切換操作スイッチ ９ シャトル弁 １１ 一速の油圧クラッチ選択弁 １２ 二速の油圧クラッチ選択弁 １３ 三速の油圧クラッチ選択弁 １１ａ、１２ａ、１３ａ、１３ｂ ソレノイド ５１ 一速加圧油路 ５２ 共通加圧油路 ６１ パイロット油路 1 1st speed hydraulic clutch 2 2nd speed hydraulic clutch 3 3rd speed hydraulic clutch 4 4th speed hydraulic clutch 5 Hydraulic source 6 Hydraulic pilot shutoff valve 7 Controller 8 Changeover operation switch 9 Shuttle valve 11 1st speed hydraulic clutch selection Valve 12 Second speed hydraulic clutch selection valve 13 Third speed hydraulic clutch selection valve 11a, 12a, 13a, 13b Solenoid 51 First speed pressurized oil passage 52 Common pressurized oil passage 61 Pilot oil passage
Claims (1)
の間に、複数の速度段の油圧クラッチの何れか一つを選
択して接続切換を行うための複数の油圧クラッチ選択弁
を設けた油圧クラッチの接続切換装置において、前記油
圧源から、一速の油圧クラッチ選択弁への一速加圧油路
と、その他の油圧クラッチ選択弁への共通加圧油路とを
並列に設け、該共通加圧油路の途中に油圧パイロット式
遮断弁を設け、一速の油圧クラッチ選択弁と一速の油圧
クラッチとの間の一速加圧油路から分岐したパイロット
油路を前記油圧パイロット式遮断弁のパイロットポート
に接続すると共に、油圧クラッチの切換操作時に接続さ
れる油圧クラッチ選択弁と遮断される油圧クラッチ選択
弁との作動開始に所定の時間差を与える制御手段を設け
たことを特徴とする油圧クラッチの多重結合防止機構。1. A plurality of hydraulic clutch selection valves are provided between a hydraulic power source and hydraulic clutches of a plurality of speed stages to select one of the hydraulic clutches of a plurality of speed stages to perform connection switching. In the connection switching device for the hydraulic clutch, the first speed pressurizing oil passage from the hydraulic pressure source to the first speed hydraulic clutch selecting valve and the common pressurizing oil passage to the other hydraulic clutch selecting valves are provided in parallel, A hydraulic pilot type shutoff valve is provided in the middle of the common pressurizing oil passage, and a pilot oil passage branched from the first speed pressurizing oil passage between the first speed hydraulic clutch selection valve and the first speed hydraulic clutch is used as the hydraulic pilot. Control means for connecting to the pilot port of the hydraulic shutoff valve and for providing a predetermined time difference between the operation start of the hydraulic clutch selection valve connected at the time of switching operation of the hydraulic clutch and the hydraulic clutch selection valve to be shut off. To Multiple coupling prevention mechanism for hydraulic clutch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1994012942U JP3010440U (en) | 1994-10-20 | 1994-10-20 | Hydraulic clutch multiple coupling prevention mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1994012942U JP3010440U (en) | 1994-10-20 | 1994-10-20 | Hydraulic clutch multiple coupling prevention mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP3010440U true JP3010440U (en) | 1995-05-02 |
Family
ID=43146203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1994012942U Expired - Lifetime JP3010440U (en) | 1994-10-20 | 1994-10-20 | Hydraulic clutch multiple coupling prevention mechanism |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3010440U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09144858A (en) * | 1995-11-20 | 1997-06-03 | Iseki & Co Ltd | Hydraulic circuit of power shift transmission |
-
1994
- 1994-10-20 JP JP1994012942U patent/JP3010440U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09144858A (en) * | 1995-11-20 | 1997-06-03 | Iseki & Co Ltd | Hydraulic circuit of power shift transmission |
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