JPS59160652A - Parking brake oil-pressure circuit for oil-pressure driven vehicle - Google Patents

Parking brake oil-pressure circuit for oil-pressure driven vehicle

Info

Publication number
JPS59160652A
JPS59160652A JP3442983A JP3442983A JPS59160652A JP S59160652 A JPS59160652 A JP S59160652A JP 3442983 A JP3442983 A JP 3442983A JP 3442983 A JP3442983 A JP 3442983A JP S59160652 A JPS59160652 A JP S59160652A
Authority
JP
Japan
Prior art keywords
pressure
oil
brake
hydraulic
pressure oil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3442983A
Other languages
Japanese (ja)
Inventor
Shinichi Mihara
三原　新一
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.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP3442983A priority Critical patent/JPS59160652A/en
Publication of JPS59160652A publication Critical patent/JPS59160652A/en
Pending legal-status Critical Current

Links

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
    • 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)
  • Braking Systems And Boosters (AREA)

Abstract

PURPOSE:To permit the control of a motor and a brake by one operating lever by using a system in which a switch valve to control the inflow and outflow of pressure oil in a mechanical type brake is actuated in an interlocking manner with the action of a directional switch valve to control an oil-pressure motor. CONSTITUTION:When an operating lever 4 is operated vertically, a limit switch 26 goes ON and a solenoid valve 25 is switched. Pressure oil discharged from an oil-pressure pump 10 is directed into the pilot chamber 24 of a switch valve 22 and thereby the valve 22 is switched to the lower position. Pressure oil discharged from the oil-pressure pump 10 is flowed into the oil pressure chamber 11d of a mechanical brake 11 to release the braking. On the other hand, by operating the operating lever 4, a directional switch valve 3 is switched, and pressure motor 2 to drive the motor 2. When the operating lever 4 is set to neutral during the drive period of the motor 2, valves 3, 22 and 25 are switched, and the supply of pressure oil to the motor 2 is stopped to actuate the brake.

Description

【発明の詳細な説明】 本発明は油圧駆動車輌のパーキングブレーキ油圧回路に
係り、特に、いわゆるネガティブな機械式ブレーキを備
えたパーキングブレーキ油圧回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parking brake hydraulic circuit for a hydraulically driven vehicle, and more particularly to a parking brake hydraulic circuit with a so-called negative mechanical brake.

第１図はこの種の従来の油圧駆動車輌のパーキングブレ
ーキ油圧回路の一例を示す回路図である。FIG. 1 is a circuit diagram showing an example of a parking brake hydraulic circuit for a conventional hydraulically driven vehicle of this type.

この図において、１は慣性体、２はこの慣性体１を駆動
する油圧モータ、３はこの油圧モータ２の作動を制御す
る方向切換弁、４はこの方向切換弁３の操作レバーであ
る。なお、５．６は別の方向切換弁、７．８はこれらの
方向切換弁５．６によって制御される油圧シリンダ等の
アクチーエータで、前述した方向切換弁３および方向切
換弁５．６によって１つのコントロールパルプ９が形成
されている。１０はこのコントロールバルブ９すなわち
方向切換弁３．５．６に圧油を供給する油圧ポンプであ
る。In this figure, 1 is an inertial body, 2 is a hydraulic motor that drives this inertial body 1, 3 is a directional switching valve that controls the operation of this hydraulic motor 2, and 4 is an operating lever for this directional switching valve 3. In addition, 5.6 is another directional switching valve, 7.8 is an actuator such as a hydraulic cylinder controlled by these directional switching valves 5.6, and 1. Two control pulps 9 are formed. Reference numeral 10 denotes a hydraulic pump that supplies pressure oil to the control valve 9, that is, the directional control valve 3.5.6.

また、１１は慣性体１と油圧モータ２との間に配置され
、圧油が導入されないときは慣性体１および油圧モータ
２を制動し、圧油の導入に応じて慣性体１および油圧モ
ータ２の制動を解除するネガティブな機械式ブレーキで
、ブレーキ板１１ａと、このブレーキ板１１ａと当接す
るピストン１１ｂと、このピストンｌｌｂをブレーキ板
１１ａ方向に付勢するばねｌｌｃと、ピストンｌｌｂを
作動させる圧油が導入される油圧室ｌｉｄとを備えてい
る。１２は油圧ポンプ１ｏと同期して回転し、機械式ブ
レーキ１１の油圧室ｌｉｄに圧油を供給可能な油圧ポン
プ、１３は油圧ポンプ１２と機械式ブレーキ１１との間
に配置され、油圧ポンプ１２から機械式ブレーキ１１の
油圧室ｌｉｄへの圧油の導入を許容、および阻止可能な
切換バルブ、１４はこの切換パルプ１３の操作レバーで
ある。なお１５はタンクである。Further, 11 is disposed between the inertial body 1 and the hydraulic motor 2, and brakes the inertial body 1 and the hydraulic motor 2 when pressure oil is not introduced, and brakes the inertial body 1 and the hydraulic motor 2 when pressure oil is introduced. This is a negative mechanical brake that releases the braking of the brake plate 11a, a piston 11b that contacts the brake plate 11a, a spring llc that biases the piston llb toward the brake plate 11a, and a pressure that operates the piston llb. It is equipped with a hydraulic chamber lid into which oil is introduced. 12 is a hydraulic pump that rotates in synchronization with the hydraulic pump 1o and can supply pressure oil to the hydraulic chamber lid of the mechanical brake 11; 13 is a hydraulic pump disposed between the hydraulic pump 12 and the mechanical brake 11; A switching valve 14 is an operating lever for this switching valve 13, which is capable of allowing and blocking pressure oil from being introduced into the hydraulic chamber lid of the mechanical brake 11. Note that 15 is a tank.

このように構成しであるパーキングブレーキ油圧回路に
あっては、切換パルプ１３が同第１図に示される状態、
すなわち機械式ブレーキ１１の油圧室ｌｉｄに圧油が導
入されない状態にあっては、ばねｌｌｃの力によってピ
ストンｌｌｂがブレーキ板１１ａに押圧され、これによ
って慣性体１および油圧モータ２は制動状態に保たれる
。In the parking brake hydraulic circuit configured in this way, the switching pulp 13 is in the state shown in FIG.
That is, when no pressure oil is introduced into the hydraulic chamber lid of the mechanical brake 11, the piston llb is pressed against the brake plate 11a by the force of the spring llc, thereby maintaining the inertial body 1 and the hydraulic motor 2 in a braking state. dripping

そし”Ｃ１操作レバー１４を操作して切換パルプ１３を
同第１図の右位置に切換え、油圧ポンプ１２からの吐出
油を油圧室ｌｉｄに導くと、ばね１１Ｃの力に抗してピ
ストンｌｌｂが作動し、これによってブレーキ板１１ａ
に付与されていた押圧力が解かれ、慣性体１および油圧
モータ２は制動が解除された状態となる。このような制
動解除状態において、操作レバー４を操作し゛（方向切
換弁３を切換えると、油圧ポンプ１０からの吐出油によ
って油圧モータ２および慣性体１が駆動される。Then, when the C1 operation lever 14 is operated to switch the switching pulp 13 to the right position in FIG. The brake plate 11a is activated.
The pressing force applied to the inertial body 1 and the hydraulic motor 2 are released, and the braking of the inertial body 1 and the hydraulic motor 2 is released. In such a brake-released state, when the operating lever 4 is operated (the directional switching valve 3 is switched), the hydraulic motor 2 and the inertial body 1 are driven by the oil discharged from the hydraulic pump 10.

ところで、このように構成しである従来のパーキングブ
レーキ油圧回路にあっては、機械式ブレーキ１１の制動
状態から慣性体１を駆動するには、まず操作レバー１４
を操作して切換パルプ１３を同第１図の右位置に切換え
た後、操作レバー４を操作して油圧モータ２を駆動させ
る必要があり、すなわち２つの操作レバー１４．４を操
作しなければならず、作業性の悪い不具合がある。By the way, in the conventional parking brake hydraulic circuit configured as described above, in order to drive the inertial body 1 from the braking state of the mechanical brake 11, the operating lever 14 must first be moved.
After switching the switching pulp 13 to the right position as shown in FIG. However, there is a problem with poor workability.

また、この従来のパーキングブレーキ油圧回路では、操
作レバー１４を駐車装置、すなわち切換パルプ１３を同
第１図に示した状態に保ち、機械式ブレーキ１１を制動
状態にしたまま、操作レバー４を操作して油圧モータ２
を駆動させてしまうような誤操作を生じるおそれがある
。そして、このような誤操作を生じると、油圧ポンプ１
ｏから高圧の圧油が吐出され、その高圧が油圧モータ等
の油圧機器に与えられ、その結果、当該油圧機器の寿命
の低下を招く。またこのように、機械式ブレーキ１１に
よる制動状態にあって油圧モータ２が回転すると、ブレ
ーキ板１１ａに焼付きゃ摩耗を生じる。In addition, in this conventional parking brake hydraulic circuit, the operating lever 4 is operated while the operating lever 14 is kept in the parking device, that is, the switching pulp 13 is kept in the state shown in FIG. 1, and the mechanical brake 11 is kept in the braking state. Hydraulic motor 2
There is a risk of an erroneous operation causing the When such an erroneous operation occurs, the hydraulic pump 1
High-pressure oil is discharged from o, and the high pressure is applied to hydraulic equipment such as a hydraulic motor, resulting in a reduction in the life of the hydraulic equipment. Further, when the hydraulic motor 2 rotates while being in a braking state by the mechanical brake 11, the brake plate 11a seizes and wears.

本発明は、このような従来技術における不具合に鑑みて
なされたもので、その目的は、１つの操作レバーによる
慣性体の制動解除および作動を可能にし、誤操作を防止
することのできる油圧駆動車輌のパーキングブレーキ油
圧回路を提供することにある。The present invention was made in view of the above-mentioned problems in the prior art, and its purpose is to provide a hydraulically driven vehicle that enables the inertia body to be released and actuated using a single operating lever, and that prevents erroneous operation. The purpose is to provide a parking brake hydraulic circuit.

この目的を達成するために本発明は、慣性体と、この慣
性体を駆動する油圧モータと、この油圧モータの作動を
制御する方向切換弁と、この方向切換弁に圧油を供給す
る油圧ポンプとを備えるとともに、圧油が導入されない
ときは慣性体および油圧モータを制動し、圧油の導入に
応じて慣性体および油圧モータの制動を解除するネガテ
ィブな機械式ブレーキを備えたものにおいて、方向切換
弁の作動に連動して、上述した機械式ブレーキへの圧油
の流入および該機械式ブレーキからの圧油の流出を制御
する制御手段を設けた構成にしである。To achieve this objective, the present invention includes an inertial body, a hydraulic motor that drives the inertial body, a directional control valve that controls the operation of the hydraulic motor, and a hydraulic pump that supplies pressure oil to the directional control valve. and a negative mechanical brake that brakes the inertial body and hydraulic motor when no pressure oil is introduced, and releases the braking of the inertial body and hydraulic motor when pressure oil is introduced. This configuration includes a control means for controlling the inflow of pressure oil into the mechanical brake and the outflow of pressure oil from the mechanical brake in conjunction with the operation of the switching valve.

以下、本発明の油圧駆動車輌のパーキングブレーキ油圧
回路を図に基づいて説明する。Hereinafter, a parking brake hydraulic circuit for a hydraulically driven vehicle according to the present invention will be explained based on the drawings.

第２図は本発明の一実施例を示す回路図である。FIG. 2 is a circuit diagram showing one embodiment of the present invention.

なお、この図において前述した第１図に示す機器と同じ
ものは同一符号で示しである。この図において、２０は
油圧ポンプ１０の吐出管路、２１はこの吐出管路２０と
機械式ブレーキ１１の油圧室ｌｉｄとを連絡する管路、
２２はこの管路２１に介設され、パイロット圧によって
作動する切換パルプである。この切換パルプ２２はタン
ク１５に連絡させである。２３は管路２１に連絡した分
岐管路で、切換パルプ２２のパイロット室２４に連絡さ
せである。２・５は管路２３に介設したソレノイドバル
ブである。２６は操作レバー４０回動に応じて信号を出
力するリミットスイッチで、前述のソレノイドバルブ２
５に電気的に接続しである。Note that in this figure, the same components as those shown in FIG. 1 described above are designated by the same reference numerals. In this figure, 20 is a discharge pipe of the hydraulic pump 10, 21 is a pipe connecting this discharge pipe 20 and the hydraulic chamber lid of the mechanical brake 11,
Reference numeral 22 indicates a switching pulp which is interposed in this pipe line 21 and is operated by pilot pressure. This switching pulp 22 is connected to the tank 15. A branch pipe 23 is connected to the pipe 21 and is connected to a pilot chamber 24 of the switching pulp 22. 2 and 5 are solenoid valves installed in the pipe line 23. 26 is a limit switch that outputs a signal in accordance with the rotation of the operating lever 40, and is a limit switch that outputs a signal according to the rotation of the operating lever 40, and
It is electrically connected to 5.

上述した切換パルプ２２、ソレノイドバルブ２５、およ
びリミットスイッチ２６は、油圧モータ２の作動を制御
する方向切換弁３の作動に連動して、機械式ブレーキ１
１への圧油の流入、および機械式ブレーキ１１からの圧
油の流出を制御する制御手段を構成している。The above-mentioned switching pulp 22, solenoid valve 25, and limit switch 26 operate in conjunction with the operation of the directional switching valve 3 that controls the operation of the hydraulic motor 2, and the mechanical brake 1.
1 and constitutes a control means for controlling the inflow of pressure oil into the mechanical brake 11 and the outflow of pressure oil from the mechanical brake 11.

なお、この一実施例にあっては、１つの油圧ポンプ１０
のみによって油圧モータ２への圧油の供給と、機械式ブ
レーキ１１への圧油の供給とをおこなうようにしである
。そして、機械式ブレーキ１１を含むその他の基本的な
構成は、例えば前述した第１図に示すものと同等に構成
しである。Note that in this embodiment, one hydraulic pump 10
Pressure oil is supplied to the hydraulic motor 2 and to the mechanical brake 11 by only the hydraulic motor 2 and the mechanical brake 11, respectively. The other basic configuration including the mechanical brake 11 is the same as that shown in FIG. 1 described above, for example.

このように構成しである一実施例にあっては、切換パル
プ２２が同第２図に示される状態、すなわち機械式ブレ
ーキ１１の油圧室ｌｉｄに圧油が導入されない状態にあ
っては、ばねｌｌｃの力によってピストンｌｌｂがブレ
ーキ板１１ａに押圧され、これによって慣性体１および
油圧モータ２は制動状態に保たれる。In one embodiment configured in this way, when the switching pulp 22 is in the state shown in FIG. 2, that is, in a state where no pressure oil is introduced into the hydraulic chamber lid of the mechanical brake 11, The piston llb is pressed against the brake plate 11a by the force of llc, thereby keeping the inertial body 1 and the hydraulic motor 2 in a braking state.

そして、操作レバー４を操作すると、リミットスイッチ
２６からソレノイドバルブ２５に信号が出力されて、こ
のソレノイドバルブ２５は同第２図の上方位置に切換え
られ、油圧ポンプ１０から吐出される圧油が管路２０．
２１．２３、ソレノイドバルブ２５を介して切換パルプ
２２のパイロット室２４に導かれ、これによって切換パ
ルプ２２が同第２図の下方位置に切換えられる。したが
って、油圧ポンプ１０から吐出される圧油は管路２１を
介して機械式ブレーキ１１の油圧室ｌｉｄに流入され、
これによってばねｌｌｃの力に抗してビンｌｌｂが作動
し、ブレーキ板１１ａにそれまで付与されていた押圧力
が解かれ、慣性体１および油圧モータ２は制動が解除さ
れた状態となる。ま□た、上述した操作レバー４の操作
に伴って、方向切換弁３が切換えられ、油圧ポンプ１０
から吐出される圧油が油圧モータ２に導かれる。そして
、機械式ブレーキ１１は制動が解除された状態圧あるこ
とから、油圧モータ２に導かれた圧油によってこの油圧
モータ２および慣性体１が駆動される。When the operating lever 4 is operated, a signal is output from the limit switch 26 to the solenoid valve 25, and the solenoid valve 25 is switched to the upper position in FIG. Route 20.
21.23, it is guided to the pilot chamber 24 of the switching pulp 22 via the solenoid valve 25, thereby switching the switching pulp 22 to the lower position shown in FIG. Therefore, the pressure oil discharged from the hydraulic pump 10 flows into the hydraulic chamber lid of the mechanical brake 11 via the pipe line 21,
As a result, the bottle llb operates against the force of the spring llc, the pressing force that had been applied to the brake plate 11a is released, and the inertial body 1 and the hydraulic motor 2 are brought into a state where the braking is released. In addition, with the operation of the control lever 4 described above, the directional control valve 3 is switched, and the hydraulic pump 10 is switched.
Pressure oil discharged from the hydraulic motor 2 is guided to the hydraulic motor 2. Since the mechanical brake 11 has a state pressure in which the brake is released, the hydraulic motor 2 and the inertial body 1 are driven by the pressure oil guided to the hydraulic motor 2.

また、上述したように油圧モータ２および慣性体１を駆
動している状態から操作レバー４を中立位置に戻すと、
油圧ポンプ１０の吐出油はタンク１５に流れ、これによ
って管路２０の圧力すなわち管路２１．２３の圧力が下
がり、切換パルプ２２は同第２図に示す状態に復帰する
。そして、機械式ブレーキ１１の油圧室ｌｉｄとタンク
１５とが切換パルプ２２を介して連通し、ばねＩＩＣの
力によってピストンｌｌｂは、ブレーキ板１１ａ’５’
押圧する方向に移動し、油圧室ｌｉｄの圧油はタンク１
５に流出され、機械式ブレーキ１１は油圧モータ２およ
び慣性体１を制動状態〜にする。なお、操作レバー４の
中立位置への復帰操作に伴ってリミットスイッチ２６が
作動し、これによってソレノイドバルブ２５は第２図に
示す状態となる。Furthermore, when the operating lever 4 is returned to the neutral position from the state in which the hydraulic motor 2 and the inertial body 1 are being driven as described above,
The oil discharged from the hydraulic pump 10 flows into the tank 15, thereby reducing the pressure in the pipe line 20, that is, the pressure in the pipe lines 21 and 23, and the switching pulp 22 returns to the state shown in FIG. 2. Then, the hydraulic chamber lid of the mechanical brake 11 and the tank 15 communicate with each other via the switching pulp 22, and the piston llb is moved by the force of the spring IIC to the brake plate 11a'5'.
It moves in the direction of pressing, and the pressure oil in the hydraulic chamber lid is transferred to tank 1.
5, and the mechanical brake 11 puts the hydraulic motor 2 and the inertial body 1 into a braking state. It should be noted that the limit switch 26 is operated in conjunction with the return operation of the operating lever 4 to the neutral position, thereby causing the solenoid valve 25 to enter the state shown in FIG. 2.

そして、同第２図に示される状態、すなわち機械式ブレ
ーキ１１の油圧室ｌｉｄに圧油が導入されず、油圧モー
タ２および慣性体１が制動された状態にあるときに、方
向切換弁５あるいは方向切換弁６を切換えてアクチュエ
ータ７、あるいはアクチュエータ８を作動させた場合に
は、管路２０．２１の圧力は高くなるものの、ソレノイ
ドノ（ル）。Then, in the state shown in FIG. 2, that is, when no pressure oil is introduced into the hydraulic chamber lid of the mechanical brake 11 and the hydraulic motor 2 and the inertial body 1 are in a braked state, the directional control valve 5 or When the actuator 7 or the actuator 8 is operated by switching the directional control valve 6, the pressure in the conduit 20, 21 increases, but the solenoid no.

２５が閉状態に保たれるので、切換ノクルブ２２も閉状
態に保たれ、したがって、油圧ポンプ１０力・ら吐出さ
れる圧油は機械式ブレーキ１１の油圧室ｌｉｄに流入さ
れず、この機械式ブレーキ１１を１依然として制動状態
に保持される。25 is kept in a closed state, the switching knob 22 is also kept in a closed state, and therefore, the pressure oil discharged from the hydraulic pump 10 does not flow into the hydraulic chamber lid of the mechanical brake 11. The brake 11 is still kept in the braking state.

このように構成しである一実施例にあっては、油圧モー
タ２の駆動に際して操作される１つの操作レバー４の操
作によって自動的に機械式ブレーキ１１は制動解除状態
となり、したがって、機械式ブレーキ１１による制動中
に油圧モータ２を駆動するような誤操作を確実に防止す
ることができる。In one embodiment configured in this manner, the mechanical brake 11 is automatically brought into the brake release state by operating one operating lever 4 that is operated when the hydraulic motor 2 is driven. It is possible to reliably prevent an erroneous operation such as driving the hydraulic motor 2 during braking by the hydraulic motor 11.

なお、上記一実施例にあっては、制御手段を構成するソ
レノイドバルブ２５は分岐管路２３に設けたが、このソ
レノイドノくルブ２５は管路２１中に介設することも可
能である。In the above embodiment, the solenoid valve 25 constituting the control means is provided in the branch line 23, but the solenoid valve 25 may also be provided in the line 21.

本発明の油圧駆動車輌のパーキングブレーキ油圧回路は
以上のように構成しであることから、１つの操作レバー
における操作のみによって慣性体を作動させることがで
き、それ故、従来に比べて作業性を向上させることので
きる効果がある。また、誤操作を確実に防止できること
から、油圧モータを含む油圧機器の寿命の低下、および
機械式ブレーキのブレーキ板の焼付きや摩耗を防止でき
、従来に比べて耐久性を向上させることのできる効果が
ある。Since the parking brake hydraulic circuit for a hydraulically driven vehicle according to the present invention is constructed as described above, the inertial body can be actuated by operating only one operating lever, and therefore work efficiency is improved compared to the conventional one. There are effects that can be improved. In addition, since erroneous operation can be reliably prevented, it is possible to reduce the lifespan of hydraulic equipment including hydraulic motors, and prevent seizure and wear of the brake plates of mechanical brakes, resulting in improved durability compared to conventional methods. There is.

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

第１図は従来の油圧駆動車輌のパーキングブレーキ油圧
回路の一例を示す回路図、第２図は本発明の油圧駆動車
輌のパーキングブレーキ油圧回路の一実施例を示す回路
図である。 １・・・・・・慣性体、２・・・・・・油圧モーフ、３
・・・・・・方向切換弁、４・・・・・・操作レバー、
１０・・・・・・油圧ポンプ、１１・・・・・・機械式
ブレーキ、２０・・・・・・吐出管路、２１・・・・・
・管路、２２・・・・・・切換パルプ、２３・・・・・
・分岐管路、２４・・・・・・バイロント室、２５・・
・・・・ソレノイドパルプ、２６・・・・・・リミット
スイッチ。 第１１棹ｉFIG. 1 is a circuit diagram showing an example of a conventional parking brake hydraulic circuit for a hydraulically driven vehicle, and FIG. 2 is a circuit diagram showing an embodiment of the parking brake hydraulic circuit for a hydraulically driven vehicle according to the present invention. 1...Inertial body, 2...Hydraulic morph, 3
...Directional switching valve, 4...Operation lever,
10...Hydraulic pump, 11...Mechanical brake, 20...Discharge pipe line, 21...
・Pipe line, 22...Switching pulp, 23...
・Branch pipe, 24... Byronto room, 25...
... Solenoid pulp, 26 ... Limit switch. 11th pole i

Claims (1)

【特許請求の範囲】[Claims] １、　慣性体と、この慣性体を駆動する油圧モータと、
この油圧モータの作動を制御する方向切換弁と、この方
向切換弁に圧油を供給する油圧ポンプとを備えるととも
に、圧油が導入されないときは慣性体および油圧モー・
夕を制動し、圧油の導入に応じて慣性体および油圧モー
タの制動を解除する機械式ブレーキを備えた油圧駆動車
輌のパーキングブレーキ油圧回路において、上記方向切
換弁の作動に連動して、上記機械式ブレーキへの圧油の
流入および該機械式ブレーキからの圧油の流出を制御す
る制御手段を設けたことを特徴とする油圧駆動車輌のパ
ーキングブレーキ油圧回路。1. An inertial body, a hydraulic motor that drives this inertial body,
It is equipped with a directional switching valve that controls the operation of this hydraulic motor, and a hydraulic pump that supplies pressure oil to this directional switching valve.
In the parking brake hydraulic circuit of a hydraulically driven vehicle equipped with a mechanical brake that brakes the vehicle at night and releases the braking of an inertial body and a hydraulic motor in response to the introduction of pressure oil, 1. A parking brake hydraulic circuit for a hydraulically driven vehicle, comprising a control means for controlling the inflow of pressure oil into a mechanical brake and the outflow of pressure oil from the mechanical brake.
JP3442983A 1983-03-04 1983-03-04 Parking brake oil-pressure circuit for oil-pressure driven vehicle Pending JPS59160652A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3442983A JPS59160652A (en) 1983-03-04 1983-03-04 Parking brake oil-pressure circuit for oil-pressure driven vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3442983A JPS59160652A (en) 1983-03-04 1983-03-04 Parking brake oil-pressure circuit for oil-pressure driven vehicle

Publications (1)

Publication Number Publication Date
JPS59160652A true JPS59160652A (en) 1984-09-11

Family

ID=12413967

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3442983A Pending JPS59160652A (en) 1983-03-04 1983-03-04 Parking brake oil-pressure circuit for oil-pressure driven vehicle

Country Status (1)

Country Link
JP (1) JPS59160652A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61146506U (en) * 1985-02-25 1986-09-10
JP2006200259A (en) * 2005-01-21 2006-08-03 Nippon Chutetsukan Kk Receptacle for manhole cover

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61146506U (en) * 1985-02-25 1986-09-10
JPH027928Y2 (en) * 1985-02-25 1990-02-26
JP2006200259A (en) * 2005-01-21 2006-08-03 Nippon Chutetsukan Kk Receptacle for manhole cover

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