JPS6139540B2 - - Google Patents
Info
- Publication number
- JPS6139540B2 JPS6139540B2 JP1241382A JP1241382A JPS6139540B2 JP S6139540 B2 JPS6139540 B2 JP S6139540B2 JP 1241382 A JP1241382 A JP 1241382A JP 1241382 A JP1241382 A JP 1241382A JP S6139540 B2 JPS6139540 B2 JP S6139540B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- unloading
- brake
- oil
- hydraulic
- 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
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000000881 depressing effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
- B60T7/122—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger for locking of reverse movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/22—Brakes applied by springs or weights and released hydraulically
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Non-Deflectable Wheels, Steering Of Trailers, Or Other Steering (AREA)
- Control Of Fluid Gearings (AREA)
Description
【発明の詳細な説明】
本発明は、可変容量形油圧ポンプとネガテイブ
ブレーキをそなえた油圧モータとを閉回路により
たがいに連結し、閉回路間にアンロード用開閉弁
を設け、ネガテイブブレーキの導油室とアンロー
ド用開閉弁のパイロツト油室とを、引張り力が作
用していないときには油圧をネガテイブブレーキ
に送る位置にスプールを切替える荷重を持つばね
をそなえたブレーキ用切替弁に接続した油圧モー
タの制御回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention connects a variable displacement hydraulic pump and a hydraulic motor equipped with a negative brake to each other through a closed circuit, provides an unloading on-off valve between the closed circuits, and connects a hydraulic motor equipped with a negative brake. A hydraulic motor that connects the oil chamber and the pilot oil chamber of the unloading on-off valve to a brake switching valve equipped with a spring with a load that switches the spool to a position that sends hydraulic pressure to the negative brake when no tensile force is applied. The present invention relates to a control circuit.
まず、油圧トランスミツシヨン付車両における
この種の油圧モータの制御油圧回路の一例を第１
図により説明する。 First, an example of the control hydraulic circuit for this type of hydraulic motor in a vehicle equipped with a hydraulic transmission will be described in the first section.
This will be explained using figures.
制御レバーをそれぞれ操作レバー３，３′に連
結した左右の可変容量形油圧ポンプ（以下油圧ポ
ンプという）１，１′と左右の油圧モータ２，
２′とは、閉回路４Ａ，４Ｂ，４′Ａ，４′Ｂによ
りたがいにつらねられており、油圧モータ２，
２′の出力軸にはシリンダの導油室６，６′に圧油
を供給すると制動が解かれ、その圧油を排出させ
るとシリンダ内におさめたブレーキばね５ａ，
５′ａにより制動がかかるネガテイブブレーキ
５，５′が設置されている。油圧ポンプ１，１′と
連動的に駆動される補給油圧ポンプ７，７′の吐
出がわは、それぞれ逆止め弁８Ａ，８Ｂ、逆止め
弁８′Ａ，８′Ｂを介して閉回路４Ａ，４Ｂ、閉回
路４′Ａ，４′Ｂにつらねられている。 Left and right variable displacement hydraulic pumps (hereinafter referred to as hydraulic pumps) 1 and 1' whose control levers are connected to operation levers 3 and 3', respectively, and left and right hydraulic motors 2,
2' are connected to each other by closed circuits 4A, 4B, 4'A, 4'B, and the hydraulic motors 2,
When pressure oil is supplied to the oil guide chambers 6 and 6' of the cylinders, the brake is released, and when the pressure oil is discharged, the brake springs 5a and 2' housed in the cylinders are released.
Negative brakes 5, 5' are installed to apply braking by 5'a. The discharge sides of the replenishment hydraulic pumps 7, 7' which are driven in conjunction with the hydraulic pumps 1, 1' are connected to the closed circuit 4A via check valves 8A, 8B and check valves 8'A, 8'B, respectively. , 4B, and are suspended in closed circuits 4'A and 4'B.
閉回路４Ａ，４Ｂには、閉鎖位置から開放位置
に切替えるパイロツト油室９ａと開放位置から閉
鎖位置に切替えるパイロツト油室９ｂとをそなえ
たアンロード用開閉弁９が接続されており、閉回
路４′Ａ，４′Ｂにも、アンロード用開閉弁９と同
様なパイロツト油室９′ａ，９′ｂをそなえたアン
ロード用開閉弁９′が接続されている。ネガテイ
ブブレーキ５，５′の導油室６，６′は、配管１０
を介してブレーキ用切替弁１１の作動ポートに接
続されており、アンロード用切替弁９，９′の一
方のパイロツト油室９ａ，９′ａは配管１２を介
して切替弁１１の作動ポートに接続されており、
アンロード用切替弁９，９′の他方のパイロツト
油室９ｂ，９′ｂは配管１３および配管１０の一
部を介して切替弁１１の作動ポートに接続されて
いる。切替弁１１は、引張り力が作用していない
ときには圧油をネガテイブブレーキ５，５′の導
油室６，６′に送る位置にスプールを保持する荷
持を持つばね１４をそなえており、スプールはケ
ーブル１５を介して長穴付きロツド１６に連結さ
れている。長穴付きロツド１６の長穴１６ａに
は、ペダル１７の中間部に設けたピン１８がはめ
こまれており、ペダル１７の下端部は軸１９に連
結されている。補給油圧ポンプ７，７′のどちら
か一方、たとえば７′の吐出がわは、切替弁１１
の給油がわポートにつらねられている。操作レバ
ー３，３′の下端部を連結した軸２０，２０′と軸
１９とは、図示してないリンク機構により連結さ
れている。なお、２１は油タンクで、これに図示
のとおり各戻り管路が接続されている。 An unloading on-off valve 9 is connected to the closed circuits 4A and 4B, and includes a pilot oil chamber 9a for switching from a closed position to an open position and a pilot oil chamber 9b for switching from an open position to a closed position. An unloading opening/closing valve 9' having pilot oil chambers 9'a, 9'b similar to the unloading opening/closing valve 9 is also connected to 'A' and 4'B. The oil guide chambers 6, 6' of the negative brakes 5, 5' are connected to the piping 10.
The pilot oil chambers 9a, 9'a of one of the unloading switching valves 9, 9' are connected to the operating port of the switching valve 11 via piping 12. connected and
The other pilot oil chambers 9b, 9'b of the unloading switching valves 9, 9' are connected to the operating port of the switching valve 11 via a pipe 13 and a part of the pipe 10. The switching valve 11 is provided with a spring 14 having a load that holds the spool in a position to send pressure oil to the oil guide chambers 6, 6' of the negative brakes 5, 5' when no tensile force is applied. is connected to a slotted rod 16 via a cable 15. A pin 18 provided in the middle of a pedal 17 is fitted into the long hole 16a of the rod 16 with a long hole, and the lower end of the pedal 17 is connected to a shaft 19. Either one of the supplementary hydraulic pumps 7, 7', for example, the discharge side of 7' is connected to the switching valve 11.
It is connected to the fuel supply port. Shafts 20, 20', which connect the lower ends of the operating levers 3, 3', and the shaft 19 are connected by a link mechanism (not shown). Note that 21 is an oil tank to which each return pipe is connected as shown.
ペダル１７を踏みこむと、図示していないリン
ク機構を介して油圧ポンプ１，１′制御用の操作
レバー３，３′が戻り、油圧モータ２，２′の回転
を停止させようとするとともに、操作レバー３，
３′が3/4戻つた時点でブレーキ用切替弁１１を切
替えて、ネガテイブブレーキ５，５′の制動を行
わせ、アンロード用開閉弁９，９′を開放させ
る。すなわち、油室６，６′の油圧が配管１０、
切替弁１１を通して油タンク２１に排出させら
れ、補給油圧ポンプ７，７′の吐出油が、切替弁
１１、配管１２を通して開閉弁９，９′のパイロ
ツト油室９ａ，９′ａに供給される。車体の停止
時にペダル１７を踏みこむことにより、油圧ポン
プ１，１′の斜板を中立にして吐出量を零にする
とともに、ネガテイブブレーキ５，５′の制動を
行わせる際に図示してないリンク機構のガタ等に
より、油圧ポンプ１，１′の斜板が確実に中立に
ならないので、油圧ポンプ１，１′がわずかに吐
出をしていると、ネガテイブブレーキ５，５′が
引きずり現象を起こす。これの対策として、ネガ
テイブブレーキ５，５′に供給する油圧を介して
アンロード用開閉弁９，９′を開放して、ネガテ
イブブレーキ５，５′が確実に制動を行つた時点
で油圧ポンプ１，１′の吐出油をアンロードさ
せ、油圧モータ２，２′へ圧油を送らなくする。 When the pedal 17 is depressed, the operating levers 3, 3' for controlling the hydraulic pumps 1, 1' return via a link mechanism (not shown), and attempt to stop the rotation of the hydraulic motors 2, 2'. Operation lever 3,
When 3' returns to 3/4, the brake switching valve 11 is switched to apply the negative brakes 5, 5' and open the unloading valves 9, 9'. That is, the oil pressure in the oil chambers 6, 6' is transferred to the pipe 10,
The oil is discharged into the oil tank 21 through the switching valve 11, and the discharged oil from the replenishment hydraulic pumps 7, 7' is supplied to the pilot oil chambers 9a, 9'a of the on-off valves 9, 9' through the switching valve 11 and piping 12. . By depressing the pedal 17 when the vehicle body is stopped, the swash plates of the hydraulic pumps 1, 1' are set to neutral, reducing the discharge amount to zero, and the negative brakes 5, 5' (not shown) are applied. Because the swash plates of the hydraulic pumps 1, 1' cannot be reliably neutral due to play in the link mechanism, if the hydraulic pumps 1, 1' are slightly discharging, the negative brakes 5, 5' will prevent the dragging phenomenon. wake up As a countermeasure against this, the unloading on-off valves 9, 9' are opened via the hydraulic pressure supplied to the negative brakes 5, 5', and when the negative brakes 5, 5' have reliably performed braking, the hydraulic pump 1 , 1' is unloaded, and no pressure oil is sent to the hydraulic motors 2, 2'.
しかし、ネガテイブブレーキ５，５′とアンロ
ード用開閉弁９，９′の作動を比較すると、ブレ
ーキ用切替弁１１がａ位置からｂ位置に切替つて
からアンロード用開閉弁９，９′が閉位置から開
位置になるまでに約0.2秒、ネガテイブブレーキ
５，５′の制動が確実に行われるまでに約0.6秒
（ネガテイブブレーキのピストンの摺動抵抗が大
きいため）かかり、時間遅れがある。したがつ
て、坂道でこの現象が生じると、アンロード用開
閉弁９，９′が開いてからネガテイブブレーキ
５，５′の制動が働くまでの間、油圧モータ２，
２′は自由となり、車体が下降し、危険を招く。 However, when comparing the operations of the negative brakes 5, 5' and the unloading on-off valves 9, 9', the unloading on-off valves 9, 9' are closed after the brake switching valve 11 is switched from the a position to the b position. It takes about 0.2 seconds to change from the position to the open position, and about 0.6 seconds until the negative brakes 5, 5' are reliably applied (because the sliding resistance of the pistons of the negative brakes is large), so there is a time delay. Therefore, when this phenomenon occurs on a slope, the hydraulic motors 2, 2,
2' becomes free and the vehicle body descends, posing a danger.
本発明は上述の欠点を容易に除くことができる
油圧モータの制御油圧回路を提供することを目的
とするものである。 SUMMARY OF THE INVENTION The object of the present invention is to provide a hydraulic motor control circuit which can easily eliminate the above-mentioned drawbacks.
つぎに、第１の発明の実施態様を第２図により
説明する。同図において、第１図と同じ符号をつ
けたものは、同じものを表わす。 Next, an embodiment of the first invention will be explained with reference to FIG. In this figure, the same reference numerals as in FIG. 1 represent the same things.
アンロード用開閉弁９，９′のスプールの片が
わには、それぞれ信号油圧がないときに常に閉弁
状態にするばね２２，２２′が設けられている。
ブレーキ用切替弁１１の作動ポートとアンロード
用開閉弁９，９′のパイロツト油室９ａ，９′ａ，
９ｂ，９′ｂとをつらねた管路１２，１３には、
それぞれオリフイス２３Ａ，２３Ｂが設けられて
いる。 Springs 22 and 22' are provided on either side of the spools of the unloading on-off valves 9 and 9', respectively, to keep the valves closed when there is no signal oil pressure.
The operation port of the brake switching valve 11 and the pilot oil chambers 9a, 9'a, of the unloading on-off valves 9, 9'.
In the conduits 12 and 13 connecting 9b and 9'b,
Orifices 23A and 23B are provided respectively.
その他の構成は第１図のものと同じである。 The other configurations are the same as those in FIG.
ブレーキ用切替弁１１が切替えられ、ネガテイ
ブブレーキ５，５′の制動が行われるときには、
油室６，６′の圧油が配管１０および切替弁１１
を通して油タンク２１に排出させられ、ネガテイ
ブブレーキ５，５′のピストンがブレーキばね５
ａ，５′ａにより押される。 When the brake switching valve 11 is switched and the negative brakes 5, 5' are applied,
The pressure oil in the oil chambers 6, 6' is connected to the piping 10 and the switching valve 11.
The pistons of the negative brakes 5, 5' are discharged into the oil tank 21 through the brake spring 5.
a, 5'a.
このとき、補給油圧ポンプ７′の圧油がブレー
キ用切替弁１１、オリフイス２３Ａ、配管１２を
通つてアンロード用開閉弁９，９′のパイロツト
油室９ａ，９′ａに供給され、開閉弁９，９′が開
放されてアンロードが行われる。その圧油はオリ
フイス２３Ａに絞られ、かつ、ばね２２，２２′
に抗して開閉弁９，９′を開く。また、開閉弁
９，９′が開くとき、他方のパイロツト油室９
ｂ，９′ｂから油タンク２１へ排出させられる圧
油もオリフイス２３Ｂにより絞られる。このた
め、アンロード用開閉弁９，９′は、ブレーキ用
切替弁１１が切替つた後、時間遅れを経てから開
くことになる。したがつて、切替弁１１が切替え
られた後ネガテイブブレーキ５，５′の制動がか
かるまでの時間遅れ0.6秒に合うように、オリフ
イス２３Ａとばね２２，２２′を設定すれば、ブ
レーキ５，５′の制動とアンロード用開閉弁９，
９′の切替え動作が同時に行われる。 At this time, the pressure oil of the replenishment hydraulic pump 7' is supplied to the pilot oil chambers 9a, 9'a of the unloading on-off valves 9, 9' through the brake switching valve 11, the orifice 23A, and the piping 12. 9 and 9' are opened to perform unloading. The pressure oil is squeezed into the orifice 23A, and the springs 22, 22'
The opening/closing valves 9, 9' are opened against this. Also, when the on-off valves 9, 9' open, the other pilot oil chamber 9
The pressure oil discharged from b, 9'b to the oil tank 21 is also throttled by the orifice 23B. Therefore, the unloading on-off valves 9, 9' open after a time delay after the brake switching valve 11 is switched. Therefore, if the orifice 23A and the springs 22, 22' are set to match the time delay of 0.6 seconds until the negative brakes 5, 5' are applied after the switching valve 11 is switched, the brakes 5, 5 'braking and unloading on-off valve 9,
The switching operation 9' is performed at the same time.
ネガテイブブレーキ５，５′の制動を解除する
ときには、圧油がブレーキ用切替弁１１、配管１
０を通して油室６，６′に供給されるとともに、
オリフイス２３Ｂにより絞られて配管１３を経て
アンロード用開閉弁９，９′のパイロツト油室９
ｂ，９′ｂに供給される。また、反対がわのパイ
ロツト油室９ａ，９′ａからの圧油は、オリフイ
ス２３Ａにより絞られた後切替弁１１を通して油
タンク２１に排出させられる。これにより、アン
ロード用開閉弁９，９′は開くときと同様に閉じ
るときにも時間遅れを生じるが、閉じる場合は、
ばね２２，２２′が閉じ動作を助けるように働く
ので、開閉弁９，９′の閉鎖のときの時間遅れは
開放のときのそれにくらべて小さい。 When releasing the negative brakes 5, 5', pressure oil flows through the brake switching valve 11 and the piping 1.
0 to the oil chambers 6, 6',
The pilot oil chamber 9 of the unloading on-off valves 9 and 9' is constricted by the orifice 23B and passes through the pipe 13.
b, 9'b. Further, the pressure oil from the pilot oil chambers 9a, 9'a on the opposite side is throttled by the orifice 23A and then discharged to the oil tank 21 through the switching valve 11. As a result, a time delay occurs when the unloading on-off valves 9, 9' close as well as when they open, but when closing,
Since the springs 22, 22' act to assist in the closing operation, the time delay when closing the on-off valves 9, 9' is smaller than when opening.
このように、オリフイス２３Ａ，２３Ｂおよび
ばね２２，２２′により、ネガテイブブレーキ
５，５′の作動とアンロード用開閉弁の開閉作動
とをほぼ同時にすることができる。 In this way, the orifices 23A, 23B and the springs 22, 22' allow the operation of the negative brakes 5, 5' and the opening/closing operation of the unloading on-off valve to be performed almost simultaneously.
第３図は第２の発明の実施態様を示し、同図に
おいて、第２図と同じ符号をつけたものは同じも
のを表わす。 FIG. 3 shows an embodiment of the second invention, and in this figure, the same reference numerals as in FIG. 2 represent the same things.
ブレーキ用切替弁１１の作動ポートにつらねた
配管１２には、切替弁１１がわへの流れを許容す
る逆止め弁２４Ａとオリフイス２５Ａとがたがい
に並列に設けられており、ブレーキ用切替弁１１
の作動ポートにつらねた配管１３には、切替弁１
１がわへの流れを許容する逆止め弁２４Ｂとオリ
フイス２５Ｂとがたがいに並列に設けられてい
る。アンロード用開閉弁９はばね２２をそなえて
いない。 A check valve 24A and an orifice 25A that allow flow to the switching valve 11 are provided in parallel with each other in the piping 12 connected to the operating port of the switching valve 11 for the brake.
The switching valve 1 is connected to the piping 13 connected to the operating port of the
A check valve 24B and an orifice 25B that allow flow to one side are provided in parallel with each other. The unloading on-off valve 9 does not have a spring 22.
なお、図示を省略したその他の構成は第２図の
ものと同様である。 Note that the other configurations not shown are the same as those in FIG. 2.
ネガテイブブレーキ５，５′の制動が行われる
ときには、油圧はブレーキ用切替弁１１からオリ
フイス２５Ａを経たのち、アンロード用開閉弁
９，９′のパイロツト油室９ａ，９′ａに供給さ
れ、反対がわのパイロツト油室９ｂ，９′ｂの圧
油は逆止め弁２４Ｂ、切替弁１１を経て油タンク
２１に排出させられ、開閉弁９，９′が開放され
る。したがつて、開閉弁９，９′が開くときの時
間遅れはオリフイス２５Ａによつて決まる。 When the negative brakes 5, 5' are applied, hydraulic pressure is supplied from the brake switching valve 11 through the orifice 25A to the pilot oil chambers 9a, 9'a of the unloading on-off valves 9, 9', and The pressure oil in the pilot oil chambers 9b, 9'b is discharged into the oil tank 21 via the check valve 24B and the switching valve 11, and the on-off valves 9, 9' are opened. Therefore, the time delay when the on-off valves 9, 9' open is determined by the orifice 25A.
ネガテイブブレーキ５，５′の制動が解除され
るときには、圧油はブレーキ用切替弁１１からオ
リフイス２５Ｂを経たのち、パイロツト油室９
ｂ，９′ｂに供給され、反対がわのパイロツト油
室９ａ，９′ａの圧油は、逆止め弁２４Ａ、切替
弁１１を経て油タンクに排出させられ、開閉弁
９，９′が閉じられる。したがつて、開閉弁が閉
じるときの時間遅れはオリフイス２５Ｂによつて
決まる。 When the negative brakes 5, 5' are released, the pressure oil flows from the brake switching valve 11 through the orifice 25B and then into the pilot oil chamber 9.
The pressure oil in the pilot oil chambers 9a, 9'a on the opposite side is discharged into the oil tank via the check valve 24A and the switching valve 11, and the on-off valves 9, 9' are Closed. Therefore, the time delay when the on-off valve closes is determined by the orifice 25B.
このように、オリフイス２５Ａ，２５Ｂによ
り、ネガテイブブレーキ５，５′の作動とアンロ
ード用開閉弁９，９′の開閉動作とがほぼ同時に
行われる。 In this way, the orifices 25A and 25B cause the negative brakes 5 and 5' to operate and the unloading on-off valves 9 and 9' to open and close almost simultaneously.
以上説明した本発明によれば、油圧トランスミ
ツシヨン付車両を坂道で停止させる時、ネガテイ
ブブレーキの制動が行われると同時に閉回路のア
ンロード用開閉弁が開くので、車体が降下するこ
とがなく、安全である。また、発進時には、アン
ロード用開閉弁が閉じると同時にネガテイブブレ
ーキの制動が解かれるので、同様に車体が降下す
ることがない。 According to the present invention described above, when stopping a vehicle with a hydraulic transmission on a slope, the closed circuit unloading valve opens at the same time as the negative brake is applied, so the vehicle body does not descend. , is safe. Furthermore, when starting, the negative brake is released at the same time as the unloading on-off valve closes, so the vehicle body does not descend as well.
第１図はネガテイブブレーキをそなえた油圧モ
ータの制御油圧回路を示す系統図、第２図、第３
図は本発明の油圧モータの制御油圧回路を示す系
統図である。
１，１′……可変容量形油圧ポンプ、２，２′…
…油圧モータ、３，３′……操作レバー、４Ａ，
４Ｂ，４′Ａ，４′Ｂ……閉回路、５，５′……ネ
ガテイブブレーキ、５ａ，５′ａ……ブレーキば
ね、６，６′……導油室、７，７′……補給油圧ポ
ンプ、８Ａ，８Ｂ，８′Ａ，８′Ｂ、……逆止め
弁、９，９′……アンロード用開閉弁、９ａ，９
ｂ，９′ａ，９′ｂ……パイロツト油室、１１……
ブレーキ用切替弁、１４……ばね、１５……ケー
ブル、１６……長穴付きロツド、１７……ペダ
ル、１８……ピン、２１……油タンク、２２，２
２′……ばね、２３Ａ，２３Ｂ……オリフイス、
２４Ａ，２４Ｂ……逆止め弁、２５Ａ，２５Ｂ…
…オリフイス。
Figure 1 is a system diagram showing the control hydraulic circuit of a hydraulic motor equipped with a negative brake, Figures 2 and 3
The figure is a system diagram showing a control hydraulic circuit for a hydraulic motor according to the present invention. 1, 1'...variable displacement hydraulic pump, 2, 2'...
...Hydraulic motor, 3,3'...Operation lever, 4A,
4B, 4'A, 4'B...Closed circuit, 5,5'...Negative brake, 5a, 5'a...Brake spring, 6,6'...Oil guide chamber, 7,7'...Replenishment Hydraulic pump, 8A, 8B, 8'A, 8'B,... Check valve, 9, 9'... Unloading on/off valve, 9a, 9
b, 9'a, 9'b...Pilot oil chamber, 11...
Brake switching valve, 14... Spring, 15... Cable, 16... Rod with long hole, 17... Pedal, 18... Pin, 21... Oil tank, 22,2
2'... Spring, 23A, 23B... Orifice,
24A, 24B...Check valve, 25A, 25B...
...orifice chair.
Claims (1)
をそなえた油圧モータとを閉回路によりたがいに
連結し、閉回路間にアンロード用開閉弁を設け、
ネガテイブブレーキの導油室とアンロード用開閉
弁のパイロツト油室とを、引張り力が作用してい
ないときには圧油をネガテイブブレーキに送る位
置にスプールを保持する荷重を持つばねをそなえ
たブレーキ用切替弁に接続した油圧モータの制御
油圧回路において、アンロード用開閉弁のスプー
ルの片がわに、信号油圧がないときには常に閉弁
状態になるようにばねを設けるとともに、アンロ
ード用開閉弁のパイロツト油室とブレーキ用切替
弁とをつらねた管路にそれぞれオリフイスを設け
たことを特徴とする油圧モータの制御油圧回路。 ２ 可変容量形油圧ポンプとネガテイブブレーキ
をそなえた油圧モータとを閉回路によりたがいに
連結し、閉回路間にアンロード用開閉弁を設け、
ネガテイブブレーキの導油室とアンロード用開閉
弁のパイロツド油室とを、引張り力が作用してい
ないときには圧油をネガテイブブレーキに送る位
置にスプールを保持する荷重を持つばねをそなえ
たブレーキ用切替弁に接続した油圧モータの制御
油圧回路において、ブレーキ用切替弁とアンロー
ド用開閉弁のパイロツト室との間に、アンロード
用開閉弁の閉じがわパイロツト油室からブレーキ
用切替弁、およびアンロード用開閉弁の開きがわ
パイロツト油室からブレーキ用切替弁への油の流
れを許容する逆止め弁を設けるとともに、それぞ
れの逆止め弁に並列にオリフイスを接続したこと
を特徴とする油圧モータの制御油圧回路。[Scope of Claims] 1. A variable displacement hydraulic pump and a hydraulic motor equipped with a negative brake are connected to each other by a closed circuit, and an unloading on-off valve is provided between the closed circuits,
A brake switch equipped with a spring with a load that holds the spool in a position to send pressurized oil to the negative brake when no tensile force is applied between the negative brake oil guide chamber and the pilot oil chamber of the unloading on/off valve. In the control hydraulic circuit for the hydraulic motor connected to the valve, a spring is installed on one side of the spool of the unloading on-off valve so that the valve is always closed when there is no signal hydraulic pressure, and a spring is installed on one side of the spool of the unloading on-off valve so that the valve is always closed when there is no signal hydraulic pressure. A control hydraulic circuit for a hydraulic motor, characterized in that an orifice is provided in each conduit connecting an oil chamber and a brake switching valve. 2. A variable displacement hydraulic pump and a hydraulic motor equipped with a negative brake are connected to each other by a closed circuit, and an unloading on-off valve is provided between the closed circuits.
A brake switch equipped with a spring with a load that holds the spool in a position to send pressurized oil to the negative brake when no tensile force is applied between the negative brake oil guide chamber and the pilot oil chamber of the unloading on/off valve. In the control hydraulic circuit for the hydraulic motor connected to the valve, there is a valve between the brake switching valve and the pilot chamber of the unloading on/off valve, and a pilot oil chamber between the closing side of the unloading on/off valve and the brake switching valve and the unloading on/off valve. A hydraulic motor characterized in that a check valve is provided to allow oil to flow from the pilot oil chamber to the brake switching valve across the opening of the load on-off valve, and an orifice is connected in parallel to each check valve. control hydraulic circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1241382A JPS58128558A (en) | 1982-01-27 | 1982-01-27 | Control oil pressure circuit for hydraulic motor with negative brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1241382A JPS58128558A (en) | 1982-01-27 | 1982-01-27 | Control oil pressure circuit for hydraulic motor with negative brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58128558A JPS58128558A (en) | 1983-08-01 |
| JPS6139540B2 true JPS6139540B2 (en) | 1986-09-04 |
Family
ID=11804572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1241382A Granted JPS58128558A (en) | 1982-01-27 | 1982-01-27 | Control oil pressure circuit for hydraulic motor with negative brake |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58128558A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170218514A1 (en) * | 2016-02-02 | 2017-08-03 | Tokyo Electron Limited | Substrate processing apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6027177A (en) * | 1997-12-19 | 2000-02-22 | Caterpillar Inc. | Method and an apparatus for controllably releasing a mechanical brake on a hydrostatic machine |
-
1982
- 1982-01-27 JP JP1241382A patent/JPS58128558A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170218514A1 (en) * | 2016-02-02 | 2017-08-03 | Tokyo Electron Limited | Substrate processing apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58128558A (en) | 1983-08-01 |
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