JPH02283932A - Vibration restraining device for vehicle during running - Google Patents
Vibration restraining device for vehicle during runningInfo
- Publication number
- JPH02283932A JPH02283932A JP10303289A JP10303289A JPH02283932A JP H02283932 A JPH02283932 A JP H02283932A JP 10303289 A JP10303289 A JP 10303289A JP 10303289 A JP10303289 A JP 10303289A JP H02283932 A JPH02283932 A JP H02283932A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- pressure
- accumulator
- boom cylinder
- boom
- 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.)
- Granted
Links
- 230000000452 restraining effect Effects 0.000 title abstract 5
- 238000009825 accumulation Methods 0.000 claims description 26
- 230000001629 suppression Effects 0.000 claims description 22
- 238000010586 diagram Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
- E02F9/2207—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing or compensating oscillations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Component Parts Of Construction Machinery (AREA)
- Vibration Prevention Devices (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、ホイールローダなと作業車両の走行振動抑
制装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a running vibration suppression device for a working vehicle such as a wheel loader.
従来の技術
第２図は、作業車両のうちホイールローダ１の側面図で
ある。図において、２はホイールローダ１の車体、３は
車体２のフロント部に装着した作業アタッチメント、４
は作業アタッチメント３のブーム、５はブームシリンダ
、６はクロスリン久７はパケットシリンダ、８はパケッ
トリンク、９はパケット、１０はパケット９内の積込み
負荷である。BACKGROUND OF THE INVENTION FIG. 2 is a side view of a wheel loader 1 of a working vehicle. In the figure, 2 is the vehicle body of the wheel loader 1, 3 is the work attachment attached to the front part of the vehicle body 2, and 4 is the work attachment attached to the front part of the vehicle body 2.
is the boom of the work attachment 3, 5 is the boom cylinder, 6 is the cross link, 7 is the packet cylinder, 8 is the packet link, 9 is the packet, and 10 is the load in the packet 9.
第３図は、ホイールローダの従来技術走行振動抑制装置
用回路図である。図において、１１はブームシリンダ５
内のヘッド側油室、１２はアキュムレータ、１３はスロ
ーリターン弁、１４は油圧ポンプ、１６はパケット弁、
１７はブーム弁、１８は振動抑制用開閉弁、１９は開閉
弁１８の切換作動側用ポート部、２０は内臓ばね、２１
は電磁弁、２２は電磁弁２１のソレノイド、２３は電気
回路、２４は電気回路２３内のスイッチ、２５は電源で
ある。FIG. 3 is a circuit diagram for a conventional running vibration suppressing device for a wheel loader. In the figure, 11 is the boom cylinder 5
12 is an accumulator, 13 is a slow return valve, 14 is a hydraulic pump, 16 is a packet valve,
17 is a boom valve, 18 is a vibration suppression on-off valve, 19 is a switching operation side port of the on-off valve 18, 20 is a built-in spring, 21
2 is a solenoid valve, 22 is a solenoid of the solenoid valve 21, 23 is an electric circuit, 24 is a switch in the electric circuit 23, and 25 is a power source.
次に、従来技術走行振動抑制装置の構成および作用機能
を第２図および第３図について述べる。Next, the structure and function of the conventional traveling vibration suppressing device will be described with reference to FIGS. 2 and 3.
ホイールローダでは、ブーム４が車体２の前部にブーム
シリンダ５により、回動可能に装着されている。また、
アキュムレータ１２とブームシリンダ５内ヘツド側油室
１１とを開閉弁１８を介して連通し、常時はその開閉弁
１８を遮断油路位置イに設定している。さらにブームシ
リンダ５のヘッド側油室１１側と、開閉弁１８の切換作
動側用ポート部１９とを連通ずる油路に電磁弁２１を介
設し、その電磁弁２１に対するスイッチ（２４）操作時
に開閉弁１８を切換作動可能とし、アキュムレータ１２
とブームシリンダら内ヘッド側油室１１とが連通状態に
なったとき振動抑制を行うように構成している。In the wheel loader, a boom 4 is rotatably mounted on the front part of a vehicle body 2 by a boom cylinder 5. Also,
The accumulator 12 and the head side oil chamber 11 in the boom cylinder 5 communicate with each other via an on-off valve 18, and the on-off valve 18 is normally set at the cutoff oil path position A. Furthermore, a solenoid valve 21 is interposed in the oil passage communicating between the head side oil chamber 11 side of the boom cylinder 5 and the switching operation side port part 19 of the on-off valve 18, and when a switch (24) for the solenoid valve 21 is operated. The on-off valve 18 can be switched and operated, and the accumulator 12
The structure is such that vibration is suppressed when the boom cylinder and the inner head side oil chamber 11 are in communication.
それで、ホイールローダを停止、または微速状態で土砂
の掘削、すくい込みなどを行うときにはスイッチ２４を
開いた状態で運転する。この場合には電磁弁２１は非通
電となっているので、電磁弁２１はタンク連通油路位置
ハにある。そのために開閉弁１８のポート部２６は、油
路２７、絞り部２８．２９、電磁弁２１のタンク連通油
路位置ハを経て、油タンク３０に通じている。それによ
りブームシリンダ５内ヘツド側油室１１と、アキュムレ
ータ１２とは開閉弁１８の遮断油路位置イにて遮断され
ている。したがって上記の場合には作業アタッチメント
３はブームシリンダ５により、ホイールローダの車体に
対して確固状態に支持される。Therefore, when the wheel loader is stopped or when excavating or scooping earth and sand at low speed, the wheel loader is operated with the switch 24 open. In this case, since the electromagnetic valve 21 is de-energized, the electromagnetic valve 21 is at the tank communication oil path position C. For this purpose, the port portion 26 of the on-off valve 18 communicates with the oil tank 30 via the oil path 27, the throttle portion 28, 29, and the tank communication oil path position C of the solenoid valve 21. As a result, the head-side oil chamber 11 in the boom cylinder 5 and the accumulator 12 are shut off at the shutoff oil path position A of the on-off valve 18. Therefore, in the above case, the work attachment 3 is firmly supported by the boom cylinder 5 with respect to the vehicle body of the wheel loader.
次にパケット９に土砂など（１０）のすくい込みを完了
し、起伏のある地面上の走行開始に当たってはスイッチ
２４をオン操作する。ソレノイド２２は通電するので、
電磁弁２１はタンク連通油路位置ハより開通油路位置二
に切換わる。上記積込負荷１０により増大しているブー
ムシリンダ５のヘッド側油室１１内圧力は、油路３１．
３２、その油路３２で分岐して一方は、絞り部２８、油
路２７を経て、開閉弁１８のポート部２６に、また地方
は、絞り部２９、電磁弁２１の開通油路位置二、油路３
３を経て、開閉弁１８のポート部１９に作用する。そこ
で開閉弁１８は、内臓ばね２０のばね力により遮断油路
位置イより開通油路位置口に切換わる。そこでブームシ
リンダ５内ヘツド側油室１１とアキュムレータ１２とが
連通状態になるので、ホイールローダが積込み負荷１０
を保持して起伏のある地面上を走行しても、十分な振動
抑制効果が発揮される。Next, after filling the packet 9 with dirt (10), the switch 24 is turned on to start traveling on uneven ground. Since the solenoid 22 is energized,
The solenoid valve 21 is switched from the tank communication oil passage position C to the open oil passage position 2. The pressure inside the head side oil chamber 11 of the boom cylinder 5, which is increasing due to the loading load 10, is caused by the pressure in the oil passage 31.
32, the oil passage 32 is branched, and one side passes through the throttle part 28 and the oil passage 27 to the port part 26 of the on-off valve 18, and the other part goes through the throttle part 29 and the open oil passage position of the solenoid valve 21; Oil road 3
3, it acts on the port portion 19 of the on-off valve 18. Therefore, the on-off valve 18 is switched from the shutoff oil passage position A to the open oil passage position by the spring force of the built-in spring 20. Then, the head side oil chamber 11 in the boom cylinder 5 and the accumulator 12 are brought into communication, so that the wheel loader can load the loaded load 10.
Sufficient vibration suppression effect is achieved even when driving on uneven ground while holding the
発明が解決しようとする課題
走行振動抑制装置用回路をそなえたホイールローダでは
、パケットに土砂などのすくい込みを完了し、起伏のあ
る地面上の走行開始に当たってはスイッチをオン操作す
る。従来技術走行振動抑制装置用回路では、上記スイッ
チをオン操作した時点に、振動抑制用開閉弁が遮断油路
位置より開通油路位置に切換わる。その場合アキュムレ
ータの圧力がブームシリンダ内ヘッド側油室よりかなり
低圧になっているときには、上記ヘッド側油室内圧油の
一部が短時間のうちにアキュムレータに流れ込む。それ
で、振動抑制装置をはたらかせるときにブームず一時的
に降下するので、運転操作上不具合であった。Problems to be Solved by the Invention In a wheel loader equipped with a circuit for a traveling vibration suppressing device, a switch is turned on to complete scooping of earth and sand into a packet and to start traveling on uneven ground. In the conventional driving vibration suppressing device circuit, when the switch is turned on, the vibration suppressing on-off valve is switched from the shutoff oil passage position to the open oil passage position. In this case, when the pressure in the accumulator is considerably lower than that in the head side oil chamber in the boom cylinder, a portion of the pressure oil in the head side oil chamber flows into the accumulator within a short time. Therefore, when the vibration suppressing device was activated, the boom would temporarily lower, causing operational problems.
この発明は上記の課題を解決し、ブームの上記降下現象
を防止できる走行振動抑制装置を提供することを目的と
する。It is an object of the present invention to provide a traveling vibration suppressing device that solves the above problems and can prevent the boom from descending.
課題を解決するための手段
上記の課題を解決するために講じたこの発明の手段は、
（１）イ、振動抑制用開閉弁の切換作動側用ポート部と
、電磁弁とを連通ずるパイロット圧作動回路にパイロッ
ト圧切換弁を介設し、
口、スイッチの操作時にアキュムレータの圧力がブーム
シリンダ内ヘッド側油室の圧力とほぼ同等の油圧状態で
あるとき、上記パイロット圧切換弁および振動抑制用開
閉弁を作動させるように構成した。Means for Solving the Problems The means of the present invention taken to solve the above problems are as follows: (1) A. Pilot pressure that communicates the switching operation side port part of the vibration suppression on-off valve and the solenoid valve. A pilot pressure switching valve is installed in the operating circuit, and when the pressure in the accumulator is almost the same as the pressure in the head side oil chamber in the boom cylinder when the switch is operated, the pilot pressure switching valve and vibration suppression valve are installed in the operating circuit. It was configured to operate an on-off valve.
（２）イ、前記請求項第１項における油圧ポンプの吐出
側に蓄圧弁を設け、
口、アキュムレータの圧力がブームシリンダ内ヘッド側
油室の圧力より低い状態のときには、前記パイロット圧
切換弁を蓄圧弁用パイロット圧油路位置に保持せしめる
とともに、蓄圧弁を蓄圧用油路位置に設定し、
ハ、また、アキュムレータの圧力がブームシリンダ内ヘ
ッド側油室の圧力とほぼ同等の油圧状態であるときには
、上記パイロット圧切換弁を開閉弁用パイロット圧油路
位置に切換作動せしめるとともに、蓄圧弁をブーム弁連
通油路位置に切換作動させるように構成した。(2) B. A pressure accumulating valve is provided on the discharge side of the hydraulic pump according to claim 1, and when the pressure of the mouth and accumulator is lower than the pressure of the head side oil chamber in the boom cylinder, the pilot pressure switching valve is turned off. Hold the pilot pressure oil passage for the pressure accumulation valve at the oil passage position, and set the pressure accumulation valve at the oil passage position for pressure accumulation, and also make sure that the pressure in the accumulator is almost the same as the pressure in the head side oil chamber in the boom cylinder. At times, the pilot pressure switching valve is switched to the opening/closing valve pilot pressure oil passage position, and the pressure accumulation valve is switched to the boom valve communication oil passage position.
作 用
イ、走行開始に当たってスイッチをオン操作しても、ア
キュムレータの圧力がブームシリンダ内ヘッド側油室の
圧力に比べて所定の圧力（パイロット圧切換弁用内臓ば
ねのばね力を考慮した圧力）より低いときには、パイロ
ット圧切換弁は蓄圧弁用パイロット圧油路位置に、かつ
蓄圧弁は蓄圧用油路位置に保持される。そこで油圧ポン
プの吐出圧はスローリターン弁を通じて、強制的にアキ
ュムレータに蓄圧される。この時点では、振動抑制用開
閉弁は遮断油路位置の状態にあるので、走行振動抑制装
置の効果はまだ発揮されてない。Operation A. Even if the switch is turned on to start traveling, the pressure in the accumulator remains at the specified pressure compared to the pressure in the head side oil chamber in the boom cylinder (pressure that takes into account the spring force of the built-in spring for the pilot pressure switching valve). When the pressure is lower, the pilot pressure switching valve is held at the pressure accumulation valve pilot pressure oil passage position, and the pressure accumulation valve is held at the pressure accumulation oil passage position. Therefore, the discharge pressure of the hydraulic pump is forcibly accumulated in the accumulator through the slow return valve. At this point, the vibration suppressing on-off valve is in the cutoff oil path position, so the effect of the travel vibration suppressing device has not yet been exerted.
口、スイッチのオン操作時に、アキュムレータの圧力が
ブームシリンダ内ヘッド側油室の圧力とほぼ同等の油圧
状態となっている場合あるいはなった場合には、パイロ
ット圧切換弁が開閉弁用パイロット圧油路位置に切換わ
るとともに、蓄圧弁は自動的に蓄圧用油路位置よりブー
ム弁連通油路位置に切換わる。そこでブームシリンダ内
ヘッド側油室側の圧力は、電磁弁の開通油路位置、パイ
ロット圧切換弁の開閉弁用パイロット圧油路位置を通じ
て、振動抑制用開閉弁の切換作動側用ポート部に作用す
る。それにより。When the switch is turned on, if the pressure in the accumulator is almost the same as the pressure in the head side oil chamber in the boom cylinder, the pilot pressure switching valve switches to the pilot pressure oil for the on-off valve. At the same time, the pressure accumulation valve is automatically switched from the pressure accumulation oil passage position to the boom valve communication oil passage position. Therefore, the pressure on the head-side oil chamber side of the boom cylinder acts on the switching operation side port of the vibration suppression on-off valve through the open oil passage position of the solenoid valve and the pilot pressure oil passage position for the on-off valve of the pilot pressure switching valve. do. Thereby.
振動抑制用開閉弁は遮断油路位置より開通油路位置に切
換わるので、ブームシリンダ内ヘッド側油室とアキュム
レータは上記開閉弁を介して連通状態となる。そこでこ
の時点より、走行振動抑制装置の効果が発揮される。Since the vibration suppressing on-off valve is switched from the cut-off oil passage position to the open oil passage position, the boom cylinder inner head side oil chamber and the accumulator are brought into communication via the on-off valve. Therefore, from this point on, the effect of the running vibration suppression device is exhibited.
ハ、上記ロ項のようにして走行振動抑制装置の効果を発
揮するようにしたので、その時点にブームシリンダのヘ
ッド側油室内圧油の一部が、短時間のうちにアキュムレ
ータに流れ込むことはなくなった。したがって、従来技
術におけるブーム降下現象を防止することができる。C. Since the effect of the travel vibration suppression device is brought out as described in item B above, at that point, a part of the pressure oil in the head side oil chamber of the boom cylinder will not flow into the accumulator in a short period of time. lost. Therefore, the boom lowering phenomenon in the prior art can be prevented.
実 施 例
以下、この発明の実施例を図面に基づいて詳細に説明す
る６第１図は、この考案にかかる走行振動抑制装置用回
路図である。図において、従来技術と同一構成要素を使
用するものに対しては同符号を付す。１５は蓄圧弁、３
４はパイロット圧切換弁、３５．３６はパイロット圧切
換弁３４のそれぞれポート部、３７は内蔵ばね、３８．
３９はそれぞれ絞り部である。Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings. 6 FIG. 1 is a circuit diagram for a running vibration suppressing device according to this invention. In the figure, the same reference numerals are given to the same components as in the prior art. 15 is a pressure accumulation valve, 3
4 is a pilot pressure switching valve, 35.36 is a port portion of the pilot pressure switching valve 34, 37 is a built-in spring, 38.
39 is a constriction portion.
次に、この発明にかかる走行振動抑制装置の請求項第１
項および第２項の構成を第１図について述べる。振動抑
制用開閉弁１８の切換作動側用ポート部１９と、電磁弁
２１とを連通ずるパイロット圧作動回路にパイロット圧
切換弁３４を介設した。そして、スイッチ２４の操作時
にアキュムレータ１２の圧力がブームシリンダ５内ヘツ
ド側油室１１の圧力とほぼ同等の油圧状態であるとき、
上記パイロット圧切換弁３４および振動抑制用開閉弁１
８を作動させるように構成した。また、油圧ポンプ１４
の吐出側に蓄圧弁１５を設け、アキュムレータ１２の圧
力がブームシリンダ５内ヘツド側油室１１の圧力より低
い状態のときには、上記パイロット圧切換弁３４を蓄圧
弁用パイロット圧油路位置ホに保持せしめるとともに、
蓄圧弁１５を蓄圧用油路位置トに設定しな。またアキュ
ムレータ１２の圧力がブームシリンダ５内ヘツド側油室
１１とほぼ同等の油圧状態であるときには、上記パイロ
ット圧切換弁３４を開閉弁用パイロット圧油路位置へに
切換作動せしめるとともに、蓄圧弁１５をブーム弁連通
油路位置チに切換作動させるように構成した。Next, claim 1 of the traveling vibration suppressing device according to the present invention is as follows.
The structure of Section 2 and Section 2 will be described with reference to FIG. A pilot pressure switching valve 34 is interposed in a pilot pressure operating circuit that communicates the switching operation side port portion 19 of the vibration suppression on-off valve 18 with the solenoid valve 21. Then, when the pressure in the accumulator 12 is in a hydraulic state almost equal to the pressure in the head side oil chamber 11 in the boom cylinder 5 when the switch 24 is operated,
The pilot pressure switching valve 34 and the vibration suppression on-off valve 1
It was configured to operate 8. In addition, the hydraulic pump 14
A pressure accumulation valve 15 is provided on the discharge side of the pressure accumulation valve, and when the pressure of the accumulator 12 is lower than the pressure of the head side oil chamber 11 in the boom cylinder 5, the pilot pressure switching valve 34 is held at the pressure accumulation valve pilot pressure oil path position H. Along with urging,
Do not set the pressure accumulation valve 15 to the pressure accumulation oil path position G. When the pressure in the accumulator 12 is almost the same as that in the head side oil chamber 11 in the boom cylinder 5, the pilot pressure switching valve 34 is switched to the opening/closing valve pilot pressure oil path position, and the pressure accumulator 15 The boom valve is configured to be switched to the boom valve communication oil path position H.
次に、この発明にかかる走行振動抑制装置の作用機能に
ついて述べる。ホイールローダの走行開始に当たってス
イッチ２４をオン操作すると、電磁弁２１は開通油路位
置二に切換わる。一方、パイロット圧切換弁３４のポー
ト部３５に対してはブームシリンダ５内ヘツド側油室１
１の油圧が、油路３１．３２．４０、その油路４０で分
岐して絞り部３８を通じて作用している。またポート部
３６に対しては、アキュムレータ１２の油圧が、スロー
リターン弁１３、油路４１．４２、絞り部３９を通じて
作用している。それで、アキュムレータ１２の圧力がブ
ームシリンダ５内ヘツド側油室１１の圧力に比べて、所
定の圧力（内臓ばね３７のばね力を考慮した圧力）より
低いときには、パイロット圧切換弁３４は蓄圧弁用パイ
ロット油路位置ホに、かつ蓄圧弁１５は蓄圧用油路位置
トに保持される。そこで油圧ポンプ１４の吐出圧は蓄圧
弁１５の蓄圧用油路位置ト、チエツク弁４３油路４４．
４２．４１、スローリターン弁１３を通じて、強制的に
アキュムレータ１２に蓄圧される。この時点では、振動
抑制用開閉弁１８は遮断油路位置イの状態にあるので、
走行振動抑制装置の効果はまだ発揮されない。この場合
には、ホイールローダの作業アタッチメントがブームシ
リンダ５により、その車体に対して確固状態に支持され
る。Next, the functions of the traveling vibration suppressing device according to the present invention will be described. When the switch 24 is turned on when the wheel loader starts traveling, the solenoid valve 21 is switched to the open oil path position 2. On the other hand, for the port portion 35 of the pilot pressure switching valve 34, the boom cylinder 5 internal head side oil chamber 1
The hydraulic pressure of 1 is branched at the oil passages 31, 32, and 40 and the oil passage 40, and acts through the throttle portion 38. Further, the oil pressure of the accumulator 12 acts on the port portion 36 through the slow return valve 13, the oil passages 41 and 42, and the throttle portion 39. Therefore, when the pressure in the accumulator 12 is lower than the pressure in the head side oil chamber 11 in the boom cylinder 5 and lower than a predetermined pressure (pressure taking into account the spring force of the built-in spring 37), the pilot pressure switching valve 34 is set to the pressure accumulator valve. The pilot oil passage is held at the position E, and the pressure accumulation valve 15 is held at the pressure accumulation oil passage position G. Therefore, the discharge pressure of the hydraulic pump 14 is determined by the position of the pressure accumulation oil passage of the pressure accumulation valve 15, the check valve 43, the oil passage 44.
42.41, the pressure is forcibly accumulated in the accumulator 12 through the slow return valve 13. At this point, the vibration suppression on-off valve 18 is in the shutoff oil path position A, so
The effects of the driving vibration suppression device have not yet been demonstrated. In this case, the working attachment of the wheel loader is firmly supported by the boom cylinder 5 relative to the vehicle body.
次に、スイッチ２４のオン操作時に、アキュムレータ１
２の圧力がブームシリンダ５内ヘツド側油室１１の圧力
とほぼ同等の油圧状態となっている場合あるいはなった
場合には、パイロット圧切換弁３４はその内臓ばね３７
のばね力により、開閉弁用パイロット圧油路位置へに切
換わる。それとともに、蓄圧弁用パイロット油路４５は
パイロット圧切換弁３４のパイロット圧油路位置へを介
して油タンク３０に連通ずるので、蓄圧弁１５は自動的
にブーム弁連通油路位置チに切換わる。そこでブームシ
リンダ５内ヘツド側油室１１側の圧力は、電磁弁２１の
開通油路位置二、油路４６、パイロット圧切換弁３４の
パイロット圧油路位置へ、油路４７を通じて、振動抑制
用開閉弁１８の切換作動側用ポート部１９に作用する。Next, when the switch 24 is turned on, the accumulator 1
2 is in a hydraulic state that is almost the same as the pressure in the head side oil chamber 11 in the boom cylinder 5, or when the pilot pressure switching valve 34
The spring force switches the valve to the pilot pressure oil path position for the on-off valve. At the same time, the pressure accumulation valve pilot oil passage 45 communicates with the oil tank 30 via the pilot pressure oil passage position of the pilot pressure switching valve 34, so the pressure accumulation valve 15 is automatically switched to the boom valve communication oil passage position. Change. Therefore, the pressure on the head side oil chamber 11 side in the boom cylinder 5 is transferred to the opening oil passage position 2 of the solenoid valve 21, the oil passage 46, and the pilot pressure oil passage position of the pilot pressure switching valve 34 through the oil passage 47 for vibration suppression. It acts on the switching operation side port portion 19 of the on-off valve 18.
それにより、開閉弁１８は遮断油路位置イより開通油路
位置口に切換わるので、ブームシリンダ５内ヘツド側油
室１１とアキュムレータ１２は、上記開閉弁１８を介し
て連通状態となる。そこでこの時点より、走行振動抑制
装置の効果が発揮される。その時点ではアキュムレータ
１２の圧力とブームシリンダ５内ヘツド側油室１１の圧
力はほぼ同等であるので、ブームシリンダ５のヘッド側
油室１１内圧油の一部が、短時間のうちにアキュムレー
タ１２に流れ込むことはない。したがって、従来技術に
おけるブーム降下現象を防止することができる。As a result, the on-off valve 18 is switched from the cut-off oil passage position A to the open oil passage position, so that the head-side oil chamber 11 in the boom cylinder 5 and the accumulator 12 are brought into communication via the on-off valve 18. Therefore, from this point on, the effect of the running vibration suppression device is exhibited. At that point, the pressure in the accumulator 12 and the pressure in the head side oil chamber 11 inside the boom cylinder 5 are almost the same, so a part of the pressure oil inside the head side oil chamber 11 of the boom cylinder 5 is transferred to the accumulator 12 within a short time. It doesn't flow in. Therefore, the boom lowering phenomenon in the prior art can be prevented.
発明の効果
従来技術走行振動抑制装置をそなえたホイールローダで
は、走行振動抑制装置をはたらかせるためにスイッチを
オン操作した場合、アキュムレータの圧力がブームシリ
ンダ内ヘッド側油室よりがなり低圧になっているときに
は、上記ヘッド側油室内圧油の一部が短時間のうちにア
キュムレータに流れ込む。そのためにブームが一時的に
降下するので、運転操作上不具合であった。Effects of the Invention In a wheel loader equipped with a conventional running vibration suppressing device, when the switch is turned on to activate the running vibration suppressing device, the pressure in the accumulator deviates from the head side oil chamber in the boom cylinder and becomes a low pressure. When the head side oil chamber is in use, a part of the pressure oil in the head side oil chamber flows into the accumulator within a short time. This caused the boom to temporarily lower, which caused operational problems.
しかしこの発明にかかる走行振動抑制装置では振動抑制
用開閉弁と電磁弁とを連通ずるパイロット圧作動回路に
パイロット圧切換弁を介設し、スイッチの操作時にアキ
ュムレータの圧力がブームシリンダ内ヘッド側油室の圧
力とほぼ同等の油圧状態であるとき上記パイロット圧切
換弁および振動抑制用開閉弁をともに開通油路位置に切
換作動させるようにしな。しかも、スイッチのオン操作
時にアキュムレータの圧力がブームシリンダ内ヘッド側
油室の圧力より低いときには、パイロット圧切換弁、蓄
圧弁などの作用により、油圧ポンプの吐出圧が、強制的
にアキュムレータに蓄圧される。このようにして、振動
抑制用開閉弁を開通油路位置に切換作動させるので、そ
の時点にはアキュムレータとブームシリンダ内ヘッド側
油室の圧力はほぼ同等となり、ブームシリンダのヘッド
倶１油室内圧油の一部が短時間のうちにアキュムレータ
に流れ込むことはなくなった。すなわち、従来技術にお
けるブーム降下現象を防止することができる。However, in the traveling vibration suppression device according to the present invention, a pilot pressure switching valve is interposed in the pilot pressure operating circuit that communicates the vibration suppression on-off valve and the solenoid valve, and when the switch is operated, the accumulator pressure is changed to the head side oil in the boom cylinder. When the hydraulic pressure is approximately equal to the pressure in the chamber, both the pilot pressure switching valve and the vibration suppression on-off valve are switched to the open oil path position. Moreover, when the pressure in the accumulator is lower than the pressure in the head side oil chamber inside the boom cylinder when the switch is turned on, the discharge pressure of the hydraulic pump is forced to accumulate in the accumulator due to the actions of the pilot pressure switching valve, pressure accumulation valve, etc. Ru. In this way, the vibration suppression on-off valve is switched to the open oil path position, so at that point the pressures in the accumulator and the head side oil chamber in the boom cylinder are almost the same, and the pressure in the head side oil chamber of the boom cylinder is Part of the oil no longer flows into the accumulator in a short period of time. That is, it is possible to prevent the boom lowering phenomenon that occurs in the prior art.
したがって、この発明にかかる走行振動抑制装置をそな
えた作業車両では、走行振動抑制装置をはたらかせた時
点にブームが降下しないので、その運転操作性を向上さ
せる。Therefore, in a work vehicle equipped with the traveling vibration suppressing device according to the present invention, the boom does not descend when the traveling vibration suppressing device is activated, thereby improving the operability of the vehicle.
第１図はこの発明にかかる走行振動抑制装置用回路図、
第２図はホイールローダの側面図、第３図は従来技術の
走行振動抑制装置用回路図である。
３−−−−−−−−−−−−−−−−−−−−−−−一
作業アタッチメント４ ブーム
５ ブームシリンダ
１１−−−−−−−−−−−−−−−−−−−一ヘッド
側油室１２ アキュムレータ
１４−−−−−−−−−−−−−−−−−一油圧ポンプ
１５−−−−−−−−−−−−−−−〜−−−−蓄圧弁
１８ 振動抑制用開閉弁
１９−−−−−−−−−−−−−−−−−−一切換作動
側用ポート部２１−−−−−−−−−−−−−−−−−
−−一電磁弁２４ スイッチ
３４ パイロット圧切換弁
以 上
特 許 出 願 人
油谷重工株式会社
代表者 早良 俊昭
第２図
第１図
手続ネ市正書
（自発）
平成
２年
１月１２日
１、事件の表示
平成１年特許願第１０３０３２号
２、発明の名称
作業車両の走行振動抑制装置
３、補正をする者
事件との関係
４、補正の対象
１） 明細書の発明の詳細な説明の欄、および図面筒
図
１）明細書第４頁第２０行目〜第５頁第２行目に記載の
「開閉弁１８の に通じている。」とあるを、「
開閉弁１８のポーＩ・部１９は油路３３、電磁弁２１の
タンク連通油路位置ハを経て、油タンク３０に通じてい
る。」と補正します。
２）明細書第５頁第２０行目に記載の「内臓ばね」とあ
るを、「内蔵ばね」と補正します。
３）明細書第６頁第１９行目に記載の「ブームず」とあ
るを「ブームが」と補正します。
４）明細書第８頁第１２行目に記載の「内臓ばね」とあ
るを、「内蔵ばね」と補正します。
５）明細書第１０頁第１０行目に記載の「内臓ばね」と
あるを、「内蔵ばね」と補正します。
６）明細書第１３頁第４行目に記載の「内臓ばね」とあ
るを、「内蔵ばね」と補正します。
７）図面の第１図を補正します。
８）図面の第３図を補正します。FIG. 1 is a circuit diagram for a running vibration suppressing device according to the present invention;
FIG. 2 is a side view of the wheel loader, and FIG. 3 is a circuit diagram of a conventional running vibration suppressing device. 3----------------- --One head side oil chamber 12Accumulator 14---One hydraulic pump 15------ - Accumulator valve 18 Vibration suppression on-off valve 19 ---------------------- Full switching operation side port section 21 --------- ---
---1 Solenoid valve 24 Switch 34 Pilot pressure switching valve Patent application Toshiaki Sawara, representative of Hitoyutani Heavy Industries Co., Ltd. Figure 2 Figure 1 Procedures Manual (self-proposed) January 12, 1990 1. Indication of the case 1999 Patent Application No. 103032 2 Name of the invention Running vibration suppression device for a work vehicle 3 Person making the amendment Relationship with the case 4 Subject of the amendment 1) Detailed explanation of the invention in the specification , and drawings and drawings 1) The phrase "opens to the on-off valve 18" written in page 4, line 20 to page 5, line 2 of the specification is replaced with "
Port I/portion 19 of on-off valve 18 communicates with oil tank 30 via oil passage 33 and tank communication oil passage position C of solenoid valve 21 . ” and correct it. 2) The phrase "built-in spring" on page 5, line 20 of the specification will be corrected to "built-in spring." 3) "Boomzu" written on page 6, line 19 of the specification will be corrected to "boomga". 4) The phrase "built-in spring" on page 8, line 12 of the specification will be corrected to "built-in spring." 5) The phrase "built-in spring" on page 10, line 10 of the specification will be corrected to "built-in spring." 6) The phrase "built-in spring" written on page 13, line 4 of the specification will be corrected to "built-in spring." 7) Correct the first drawing. 8) Correct figure 3 of the drawing.
Claims (2)
可能に装着し、またアキュムレータとブームシリンダ内
ヘッド側油室とを振動抑制用開閉弁を介して連通し、常
時はその開閉弁を遮断油路位置に設定し、さらにブーム
シリンダのヘッド側油室側と、上記開閉弁の切換作動側
用ポート部とを連通する油路に電磁弁を介設し、その電
磁弁に対するスイッチ操作時に上記開閉弁を切換作動可
能とし、上記アキュムレータとブームシリンダ内ヘッド
側油室とが連通状態となったとき振動抑制を行うように
した走行振動抑制装置において、上記開閉弁の切換作動
側用ポート部と、電磁弁とを連通するパイロット圧作動
回路にパイロット圧切換弁を介設し、スイッチの操作時
にアキュムレータの圧力がブームシリンダ内ヘッド側油
室の圧力とほぼ同等の油圧状態であるとき上記パイロッ
ト圧切換弁および振動抑制用開閉弁を作動させるように
構成したことを特徴とする作業車両の走行振動抑制装置
。(1) The boom is rotatably mounted on the front part of the vehicle body using a boom cylinder, and the accumulator and the head side oil chamber inside the boom cylinder are communicated via a vibration suppression on-off valve, and the on-off valve is normally shut off. A solenoid valve is installed in the oil passage that communicates the boom cylinder's head oil chamber side with the switching operation side port of the on-off valve, and when the switch is operated for the solenoid valve, the above-mentioned In the traveling vibration suppression device, the on-off valve is switchable and is configured to suppress vibration when the accumulator and the head-side oil chamber in the boom cylinder are in communication, and the on-off valve has a switching action side port portion and , a pilot pressure switching valve is interposed in the pilot pressure operating circuit that communicates with the solenoid valve, and when the pressure in the accumulator is in a hydraulic state almost equal to the pressure in the head side oil chamber in the boom cylinder when the switch is operated, the above pilot pressure is A traveling vibration suppressing device for a work vehicle, characterized in that it is configured to operate a switching valve and a vibration suppressing on-off valve.
蓄圧弁を設け、アキュムレータの圧力がブームシリンダ
内ヘッド側油室の圧力より低い状態のときには前期パイ
ロット圧切換弁を蓄圧弁用パイロット圧油路位置に保持
せしめるとともに蓄圧弁を蓄圧用油路位置に設定し、ま
たアキュムレータの圧力がフームシリンダ内ヘッド側油
室の圧力とほぼ同等の油圧状態であるときには上記パイ
ロット圧切換弁を開閉弁用パイロット圧油路位置に切換
作動せしめるとともに蓄圧弁をブーム弁連通油路位置に
切換作動させるようにしたことを特徴とする特許請求の
範囲第１項記載の作業車両の走行振動抑制装置。(2) A pressure accumulation valve is provided on the discharge side of the hydraulic pump according to claim 1, and when the pressure of the accumulator is lower than the pressure of the head side oil chamber in the boom cylinder, the pilot pressure switching valve is set to the pilot pressure for the pressure accumulation valve. At the same time, the pressure accumulator valve is set to the pressure accumulation oil passage position, and when the pressure of the accumulator is almost the same as the pressure of the head side oil chamber in the foot cylinder, the pilot pressure switching valve is opened/closed. 2. The traveling vibration suppressing device for a work vehicle according to claim 1, wherein the pressure accumulating valve is switched to a boom valve communication oil passage position at the same time as the pressure accumulation valve is switched to a boom valve communication oil passage position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10303289A JP2660746B2 (en) | 1989-04-21 | 1989-04-21 | Work vehicle running vibration suppression method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10303289A JP2660746B2 (en) | 1989-04-21 | 1989-04-21 | Work vehicle running vibration suppression method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02283932A true JPH02283932A (en) | 1990-11-21 |
| JP2660746B2 JP2660746B2 (en) | 1997-10-08 |
Family
ID=14343319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10303289A Expired - Fee Related JP2660746B2 (en) | 1989-04-21 | 1989-04-21 | Work vehicle running vibration suppression method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2660746B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005155230A (en) * | 2003-11-27 | 2005-06-16 | Komatsu Ltd | Hydraulic circuit for suppressing traveling vibration of wheel type construction machine |
| WO2011073721A1 (en) * | 2009-12-17 | 2011-06-23 | Volvo Compact Equipment Sas | Construction equipment machine with improved boom suspension |
| CN112031064A (en) * | 2019-06-03 | 2020-12-04 | 江苏恒立液压科技有限公司 | Hydraulic system with vibration suppression function and engineering machinery with same |
-
1989
- 1989-04-21 JP JP10303289A patent/JP2660746B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005155230A (en) * | 2003-11-27 | 2005-06-16 | Komatsu Ltd | Hydraulic circuit for suppressing traveling vibration of wheel type construction machine |
| WO2011073721A1 (en) * | 2009-12-17 | 2011-06-23 | Volvo Compact Equipment Sas | Construction equipment machine with improved boom suspension |
| CN112031064A (en) * | 2019-06-03 | 2020-12-04 | 江苏恒立液压科技有限公司 | Hydraulic system with vibration suppression function and engineering machinery with same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2660746B2 (en) | 1997-10-08 |
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| LAPS | Cancellation because of no payment of annual fees |