JPS5947177B2 - Hydraulic circuit for mixer cars, etc. - Google Patents
Hydraulic circuit for mixer cars, etc.Info
- Publication number
- JPS5947177B2 JPS5947177B2 JP51068529A JP6852976A JPS5947177B2 JP S5947177 B2 JPS5947177 B2 JP S5947177B2 JP 51068529 A JP51068529 A JP 51068529A JP 6852976 A JP6852976 A JP 6852976A JP S5947177 B2 JPS5947177 B2 JP S5947177B2
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- circuit
- switching valve
- mixer
- hydraulic pump
- 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
Links
Landscapes
- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
- Control Of Fluid Gearings (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Description
【発明の詳細な説明】
本発明は動力取出装置から動力を取り出し、ミキサード
ラムを駆動するミキサー車の油圧閉回路に関するもので
、特に車輌の変速時のクラッチの断接操作に関連して切
換制御される電磁弁を用いてミキサードラムの負荷に関
係なく変速操作を容易にするとともに、合わせてこの負
荷による逆転を防止するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic closed circuit for a mixer truck that extracts power from a power extraction device and drives a mixer drum, and particularly relates to switching control related to clutch engagement and disconnection operations during vehicle gear shifting. This system uses a solenoid valve to facilitate speed change operations regardless of the load on the mixer drum, and also prevents reverse rotation due to this load.
従来ミキサー車の油圧回路においては車輌の変速操作時
、負荷によって変速操作が困難となるため、バイパス弁
■を配設したものが考案されているが、クラッチペダル
８の踏力を利用して前記切換弁を機械的に切換制御する
ため、運転作業者は切換弁操作用の余分な踏力を必要と
し、疲労を増大しやすく、コントロールケーブル、リン
クなどの配設が難しいといった欠点があった。Conventionally, in the hydraulic circuit of a mixer truck, when changing gears of the vehicle, it becomes difficult to change gears depending on the load, so a bypass valve (■) has been devised. Since the valve is mechanically switched and controlled, operators are required to use extra pedal force to operate the switching valve, which tends to increase fatigue, and there are drawbacks such as difficulty in arranging control cables, links, etc.
しかも油圧閉回路と並列に切換弁■を第１図に示すよう
に配設するものにあっては、クラッチペダルの断操作時
にこの切換弁■には油圧ポンプからの吐出油と、ミキサ
ードラムの負荷による逆転で生じる排油が合流するが、
この後再びクラッチペダルを後操作するとこめ合流が阻
止されるためサージ圧が発生し、大きな衝撃音が生起さ
れる不具合があった。Moreover, in the case where a switching valve ■ is arranged in parallel with the hydraulic closed circuit as shown in Fig. 1, when the clutch pedal is disengaged, this switching valve ■ receives oil discharged from the hydraulic pump and the mixer drum. Drained oil caused by reversal due to load joins together,
After this, when the clutch pedal is operated later again, the merging is blocked, causing a surge pressure and causing a large impact noise.
一方、ミキサードラムの逆転を阻止し単に油圧ポンプ吐
出側と吸込側とを短絡するには第２図に示すようにセン
ターバイパス形の電磁切換弁■１を用いればよいが、こ
のような切換弁■１は本来ポンプの吐出方向が一定の場
合を想定して弁体におけるポンプポート、タンクポート
の位置、形状が決定されているため、本体ミキサー車の
油圧回路のように吐出側が二方向に、随時変換するもの
にあっては逆方向の吐出の場合、タンクポートに高圧が
作用して好ましくなく、このような切換弁を使用する際
には結局油圧ポンプの吐出方向を一定とし、合わせて、
ミキサードラムの正転逆転用の方向制御弁■２を配設し
なければならないので、架装位置が限定されているミキ
サー車においては高価、かつ大型となって不向きである
。On the other hand, in order to prevent the mixer drum from reversing and simply short-circuit the hydraulic pump discharge side and suction side, a center bypass type electromagnetic switching valve ■1 can be used as shown in Fig. 2. ■1: Since the position and shape of the pump port and tank port in the valve body are originally determined assuming that the pump discharge direction is constant, the discharge side is oriented in two directions, like the hydraulic circuit of the main mixer truck. If the discharge is in the opposite direction for a type that is changed at any time, high pressure will act on the tank port, which is undesirable.When using such a switching valve, the discharge direction of the hydraulic pump should be kept constant, and in addition,
Since it is necessary to provide a directional control valve (2) for forward and reverse rotation of the mixer drum, this method is expensive and large, making it unsuitable for mixer trucks where mounting locations are limited.
本件発明は上記のような欠点を解決したものでその構成
について第３図を参照して説明すると、１は吐出量可変
の油圧ポンプであって、Ｐ、Ｔ。The present invention solves the above-mentioned drawbacks, and its configuration will be explained with reference to FIG. 3. Reference numeral 1 denotes a hydraulic pump with variable discharge amount, P and T.
０、（動力取出装置）２により駆動されて、回路Ａ、Ｂ
両方向に吐出することができる従来公知のものである。0, (power take-off device) 2, and circuits A and B
This is a conventionally known device that can eject in both directions.
３はミキサードラム４を駆動する定容量の油圧モーター
であって、前記油圧ポンプ１、回路Ａ、Ｂとともに油圧
閉回路を構成している。Reference numeral 3 denotes a fixed displacement hydraulic motor for driving the mixer drum 4, and together with the hydraulic pump 1 and circuits A and B, it constitutes a hydraulic closed circuit.
今前記ミキサードラム４の正転駆動時、回路Ａを油圧ポ
ンプ１からの吐出側とすると、回路Ａにはクラッチペダ
ル８に設けた電気接点９の開閉により切換制御される電
磁切換弁５が前記油圧モータ３と直列に配設され、クラ
ッチペダル８の断操作により第３図の位置より他位置へ
切換わって、回路Ａより回路Ｂへのバイパス回路６を連
通ずるものである。Now, when the mixer drum 4 is driven in normal rotation, if the circuit A is the discharge side from the hydraulic pump 1, the electromagnetic switching valve 5, which is switched and controlled by the opening and closing of the electric contact 9 provided on the clutch pedal 8, is connected to the circuit A. It is arranged in series with the hydraulic motor 3, and is switched from the position shown in FIG. 3 to another position by disengaging the clutch pedal 8, thereby communicating the bypass circuit 6 from the circuit A to the circuit B.
７は補給ポンプであって、閉回路に生じた漏洩油量を補
給するものである。Reference numeral 7 denotes a replenishment pump, which replenishes the amount of leaked oil that occurs in the closed circuit.
次に作用について説明すると、ミキサードラム４を正転
駆動しながら走行中、増速あるいは減速操作を行なう際
にはクラッチペダル８を断操作すれば電磁切換弁５は切
換って、油圧ポンプ１の吐出油は回路Ａ、−電磁切換弁
５．−バイパス回路６、一回路Ｂへと還流し、油圧ポン
プ１は無負荷の状態になるため、変速操作は容易に行な
うことができる。Next, the operation will be explained. While driving the mixer drum 4 in normal rotation, when increasing or decelerating the speed, if the clutch pedal 8 is released, the electromagnetic switching valve 5 is switched and the hydraulic pump 1 is switched. Discharge oil is from circuit A, - solenoid switching valve 5. - Since the flow is returned to the bypass circuit 6 and the circuit B, and the hydraulic pump 1 is placed in a no-load state, the speed change operation can be performed easily.
この際、ミキサードラム４が混練された生コンクリート
の重心位置によって逆転を生じる状態になっていても、
回路Ａ側において、電磁切換弁５が油圧モータ３からの
排油を阻止するため、逆転現象は起らないし、ミキサー
ドラム４が正転を継続しようとしても、電磁切換弁５が
油圧モータ３−の給油を阻止するため、正転も起らない
。At this time, even if the mixer drum 4 is in a state where the center of gravity of the mixed concrete is reversed,
On the circuit A side, the electromagnetic switching valve 5 prevents oil from draining from the hydraulic motor 3, so no reverse rotation occurs, and even if the mixer drum 4 attempts to continue rotating forward, the electromagnetic switching valve 5 prevents the hydraulic motor 3 from draining. Because this prevents oil supply, forward rotation does not occur.
この後、変速操作を終了して、クラッチペダル８を接操
作すれば、電磁切換弁５は図示の位置に復帰し、油圧ポ
ンプ１からの吐出油は回路Ａ−電磁切換弁５を経て油圧
モータ３へ流入し、ミキサードラム４の正転駆動を継続
し、バイパス回路３は閉鎖される。After that, when the gear shift operation is completed and the clutch pedal 8 is engaged, the electromagnetic switching valve 5 returns to the position shown in the figure, and the oil discharged from the hydraulic pump 1 is transferred to the hydraulic motor via circuit A - the electromagnetic switching valve 5. 3, the mixer drum 4 continues to be driven in normal rotation, and the bypass circuit 3 is closed.
一方、ミキサードラム４を逆転させて混練された生コン
クリートを排出する場合は、油圧ポンプ１の傾転角を操
作して油圧ポンプ１からの吐出油を回路Ｂ方向より吐出
すれば、油圧モータ３は逆転し、生コンクリートの排出
を行なうことができる。On the other hand, when discharging the mixed concrete by reversing the mixer drum 4, the oil from the hydraulic pump 1 can be discharged from the circuit B direction by manipulating the tilt angle of the hydraulic pump 1. can be reversed and fresh concrete can be discharged.
この時、車輌の前進あるいは後退操作のため、クラッチ
ペダルを断操作しても、回路Ａ側において、電磁切換弁
５が油圧モータ３の排油を阻止するので逆転は起らず、
円滑な排出作業を行うことができる。At this time, even if the clutch pedal is released to move the vehicle forward or backward, the electromagnetic switching valve 5 prevents oil from being drained from the hydraulic motor 3 on the circuit A side, so no reverse rotation occurs.
Smooth discharge work can be performed.
以上のように、本発明にあっては、変速操作を容易に行
うことができるさ共に、余分な踏力は不必要となり、運
転作業者の疲労を防止することができる。As described above, according to the present invention, it is possible to easily perform a gear change operation, and unnecessary pedal force is required, so that fatigue of the operator can be prevented.
また、ミキサードラムの逆転を合わせて阻止することが
でき、かつ、配管系統もきわめて簡単になって架装を容
易に行うことができる。In addition, it is possible to prevent the mixer drum from reversing, and the piping system becomes extremely simple, making installation easier.
第１図、第２図は従来技術によるミキサー車の油圧回路
図、第３図は本発明の実施例を示す油圧回路図である。
図中１は吐出量可変油圧ポンプ、３は定容量油圧モータ
、５は電磁切換弁、８はクラッチペダルである。1 and 2 are hydraulic circuit diagrams of a mixer truck according to the prior art, and FIG. 3 is a hydraulic circuit diagram showing an embodiment of the present invention. In the figure, 1 is a variable discharge amount hydraulic pump, 3 is a constant displacement hydraulic motor, 5 is an electromagnetic switching valve, and 8 is a clutch pedal.
Claims (1)
サードラムの負荷を駆動する油圧モータとを接続した油
圧閉回路において、クラッチペダルの断接操作に連係し
て切換制御される電磁切換弁を前記油圧閉回路に直列に
配設し、該切換弁を前記クラッチペダルの断操作時、バ
イパス回路を介して前記油圧ポンプの吐出側と吸込側上
を連通ずるとともに前記油圧モータの流出側と流入側と
の一方を遮断するように構成したミキサー車の油圧回路
。1. In a hydraulic closed circuit that connects a variable discharge volume hydraulic pump and a hydraulic motor that drives the load of a mixer drum that can generate reverse force, an electromagnetic switching valve that is switched and controlled in conjunction with the engagement and disengagement operation of the clutch pedal is installed. The switching valve is arranged in series with the hydraulic closed circuit, and when the clutch pedal is disengaged, the switching valve communicates with the discharge side and suction side of the hydraulic pump via a bypass circuit, and connects the outlet side and the inflow side of the hydraulic motor with each other. A hydraulic circuit for a mixer truck configured to cut off one side from the other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51068529A JPS5947177B2 (en) | 1976-06-10 | 1976-06-10 | Hydraulic circuit for mixer cars, etc. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51068529A JPS5947177B2 (en) | 1976-06-10 | 1976-06-10 | Hydraulic circuit for mixer cars, etc. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS52151467A JPS52151467A (en) | 1977-12-15 |
| JPS5947177B2 true JPS5947177B2 (en) | 1984-11-17 |
Family
ID=13376340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51068529A Expired JPS5947177B2 (en) | 1976-06-10 | 1976-06-10 | Hydraulic circuit for mixer cars, etc. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5947177B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5725907A (en) * | 1980-07-22 | 1982-02-10 | Kyokuto Kaihatsu Kogyo Co | Driving device for drum of mixer-mobile |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4947775A (en) * | 1972-04-25 | 1974-05-09 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5080675U (en) * | 1973-11-30 | 1975-07-11 |
-
1976
- 1976-06-10 JP JP51068529A patent/JPS5947177B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4947775A (en) * | 1972-04-25 | 1974-05-09 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS52151467A (en) | 1977-12-15 |
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