JPH04243610A - Cargo handling transportation vehicle - Google Patents
Cargo handling transportation vehicleInfo
- Publication number
- JPH04243610A JPH04243610A JP708191A JP708191A JPH04243610A JP H04243610 A JPH04243610 A JP H04243610A JP 708191 A JP708191 A JP 708191A JP 708191 A JP708191 A JP 708191A JP H04243610 A JPH04243610 A JP H04243610A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- switch
- distance
- cargo handling
- vehicle
- 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
Links
- 239000000725 suspension Substances 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 abstract description 6
- 230000006698 induction Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 238000001994 activation Methods 0.000 description 1
- 244000145845 chattering Species 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
Landscapes
- Vehicle Body Suspensions (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この出願の発明は、荷役運搬車両
に関するものである。[Field of Industrial Application] The invention of this application relates to a cargo handling and transport vehicle.
【０００２】0002
【従来の技術】油圧式懸架装置を備えた車両において、
その懸架装置の分担する荷重が空車時と積車時でほとん
ど差のないときには、走行中、油圧シリンダとアキュー
ムレータ間の回路に封入されている油量を変える必要は
なく、油圧シリンダやバルブからの漏れより微量の減少
分だけを補充するため始動直後における１回のみのレベ
リング操作によって油量の調整を行えばよい。[Prior Art] In a vehicle equipped with a hydraulic suspension system,
When the load shared by the suspension system is almost the same between empty and loaded, there is no need to change the amount of oil sealed in the circuit between the hydraulic cylinder and accumulator during driving, and the amount of oil from the hydraulic cylinder or valve is In order to replenish only the amount that has decreased by a minute amount from the leakage, the oil amount may be adjusted by performing a leveling operation only once immediately after starting.
【０００３】ところが、空車時と積車時で懸架装置にか
かる荷重に大きな差があるときには、油量は封じ込めた
ままでは車高が変化するのでたえずレベリング装置を作
動させておく必要がある。この場合、前記装置は走行に
伴う車両の振動により常に作動しているので、機器の寿
命が短くなり、また自励振動を誘起するなどの障害を起
こすほか、これらの装置を作動させる油圧源の圧力を保
持するための動力損失も見逃せない。However, when there is a large difference in the load applied to the suspension system between when the vehicle is empty and when the vehicle is loaded, it is necessary to constantly operate the leveling device because the vehicle height will change even if the amount of oil remains contained. In this case, the devices are constantly operating due to the vibrations of the vehicle as the vehicle travels, which shortens the life of the device, induces self-excited vibrations and other problems, and reduces the hydraulic power source that operates these devices. The loss of power required to maintain pressure cannot be overlooked.
【０００４】0004
【発明が解決しようとする課題】この出願の発明では、
上記した従来の技術の問題点であった、■「機器の短命
化」■「自励振動を誘起するなどの障害を起こす」■「
装置を作動させる油圧源の圧力を保持するために多くの
動力を損失する」を回避できる荷役運搬車両を提供する
ことを課題とする。[Problem to be solved by the invention] In the invention of this application,
The above-mentioned problems with the conventional technology are: - shortening the lifespan of the equipment; causing problems such as inducing self-excited vibrations;
An object of the present invention is to provide a cargo handling and transportation vehicle that can avoid the loss of a large amount of power in order to maintain the pressure of a hydraulic power source that operates a device.
【０００５】[0005]
【課題を解決する為の手段】そこで、この出願の請求項
１記載の発明では、アキュムレータと接続された油圧シ
リンダを介して車台フレーム側の重量を車軸にかけてあ
り且つ前記油圧シリンダ内の油量変化により前記車台フ
レームと車軸間距離が変化させ得る油圧式懸架装置と、
積載物の積卸時において荷台を上下動させる昇降装置と
を有する荷役運搬車両に於いて、昇降装置の操作に伴っ
て車台フレームと車軸間距離が一定以下になったとき、
それを検出するスイッチの出力により開弁せしめられて
上記油圧シリンダに油の供給を行う電磁弁と、昇降装置
の操作に伴って車台フレームと車軸間距離が一定以上に
なったとき、それを検出するスイッチの出力により開弁
せしめられて油圧シリンダの油の排出を行う電磁弁と、
前記昇降装置の作動中及び作動直後の数秒間のみ上記ス
イッチの出力状態を維持させるタイマとを具備させてい
る。[Means for Solving the Problems] Therefore, in the invention according to claim 1 of this application, the weight of the chassis frame is applied to the axle via a hydraulic cylinder connected to an accumulator, and the amount of oil in the hydraulic cylinder changes. a hydraulic suspension system capable of changing the distance between the chassis frame and the axle;
In cargo handling and transportation vehicles equipped with a lifting device that moves the cargo platform up and down during loading and unloading, when the distance between the chassis frame and the axle falls below a certain level due to the operation of the lifting device,
A solenoid valve that is opened by the output of a switch that detects this and supplies oil to the hydraulic cylinder, and a solenoid valve that detects when the distance between the chassis frame and the axle exceeds a certain level due to the operation of the lifting device. a solenoid valve that is opened by the output of a switch to discharge oil from the hydraulic cylinder;
A timer is provided to maintain the output state of the switch only for a few seconds during and immediately after the operation of the lifting device.
【０００６】又、請求項２記載の発明では、請求項１記
載の発明に関し、車台フレームと車軸間距離が一定以下
になったときを検出するスイッチと、それが一定以上に
なったときを検出するスイッチとの検出位置を一定以上
の間隔を設けている。[0006] Furthermore, the invention as claimed in claim 2 relates to the invention as claimed in claim 1, and further includes a switch for detecting when the distance between the chassis frame and the axle becomes less than a certain value, and a switch for detecting when the distance becomes more than a certain value. The detection position of the switch is spaced a certain distance or more apart.
【０００７】[0007]
【作用】この出願の発明は次の作用を有する。
（請求項１記載の発明の作用）荷役作業終了後の荷台の
昇降駆動に伴い、車台フレームと車軸間距離が一定以下
になっているときには、スイッチがこれを検出して電磁
弁を開弁せしめて油圧シリンダに油が供給され、逆に、
車台フレームと車軸間距離が一定以上になっているとき
には、スイッチがこれを検出して電磁弁を開弁せしめて
油圧シリンダから油が排出される。そして、車台フレー
ムと車軸間距離が所定の距離に達すると、スイッチの出
力により電磁弁が閉弁せしめらて油の油圧シリンダへの
供給・排出が停止され、その結果、前記距離は所定に保
持されることとなる。[Operations] The invention of this application has the following functions. (Function of the invention as claimed in claim 1) When the distance between the chassis frame and the axle is below a certain level due to the lifting and lowering of the cargo platform after the cargo handling work is completed, the switch detects this and opens the solenoid valve. oil is supplied to the hydraulic cylinder, and conversely,
When the distance between the chassis frame and the axle exceeds a certain value, the switch detects this and opens the solenoid valve, allowing oil to be discharged from the hydraulic cylinder. When the distance between the chassis frame and the axle reaches a predetermined distance, the output of the switch closes the solenoid valve, stopping the supply and discharge of oil to the hydraulic cylinder, and as a result, the distance is maintained at a predetermined value. It will be done.
【０００８】尚、上記油の供給・排出はタイマの作用に
よって、昇降装置の停止後も数秒間上記スイッチの出力
状態を維持させることから、車台フレームと車軸間距離
は確実に補正されることとなる。
（請求項２記載の発明の作用）車台フレームと車軸間距
離が一定以下になったときを検出するスイッチと、それ
が一定以上になったときを検出するスイッチとの検出位
置を一定以上の間隔を設けていることから、所謂、チャ
タリング現象が防止できることとなる。[0008] Furthermore, since the oil supply/drainage is performed by a timer and the output state of the switch is maintained for several seconds even after the lifting device has stopped, the distance between the chassis frame and the axle can be reliably corrected. Become. (Function of the invention according to claim 2) The detection positions of the switch that detects when the distance between the chassis frame and the axle becomes less than a certain value and the switch that detects when the distance becomes more than a certain value are set at intervals of more than a certain value. Since this is provided, the so-called chattering phenomenon can be prevented.
【０００９】[0009]
【実施例】以下、この出願の発明の構成を実施例として
示した図面に従って説明する。この実施例の荷役運搬車
両は、図１に示すように、車台フレーム１の前部に前輪
１３を支持する一対の油圧式懸架装置２，２を、後部に
昇降シリンダ１１，１２により支持された荷台１０を、
それぞれ具備させたものであり、前記昇降シリンダ１１
，１２の動作により荷台１０を路面に対して昇降駆動（
地面に対して接触・離反させる為に行われる）させた直
後の数秒間のみ、油圧式懸架装置２，２を介して車高が
自動調整されるようにしている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the invention of this application will be explained below with reference to the drawings showing examples. As shown in FIG. 1, the cargo handling vehicle of this embodiment has a pair of hydraulic suspension systems 2, 2 supporting front wheels 13 at the front part of a chassis frame 1, and a pair of hydraulic suspension systems 2, 2 supported at the rear part by lifting cylinders 11, 12. The loading platform 10,
The elevating cylinder 11
, 12 drives the loading platform 10 up and down with respect to the road surface (
The vehicle height is automatically adjusted via the hydraulic suspension systems 2, 2 only for a few seconds immediately after the vehicle is brought into contact with and separated from the ground.
【００１０】上記した各油圧式懸架装置２は、図１及び
図２に示すように、基本的には、車台フレーム１から垂
下させたブラケットに揺動可能に取付けられた下側トル
クロッド２０と、車台フレーム１に揺動可能に取付けら
れた上側トルクロッド２１と、車台フレーム１と前記下
側トルクロッド２０との間に取付けた油圧シリンダ５及
び二つのレベル検出器３，４とから成り、上側トルクロ
ッド２１及び下側トルクロッド２０の自由端側で前車軸
１４を支持させて構成してある。As shown in FIGS. 1 and 2, each of the hydraulic suspension systems 2 described above basically includes a lower torque rod 20 that is swingably attached to a bracket suspended from the chassis frame 1. , consists of an upper torque rod 21 swingably attached to the chassis frame 1, a hydraulic cylinder 5 and two level detectors 3 and 4 attached between the chassis frame 1 and the lower torque rod 20, The front axle 14 is supported by the free end sides of the upper torque rod 21 and the lower torque rod 20.
【００１１】レベル検出器３は、図４に示すように、ロ
ッド３１の一端に取付けられた磁性を有する筒状体３２
を筒状のケース３０内で進退させ、前記ロッド３１とケ
ース３０に配設した近接スイッチ３３との接離により出
力をＯＮ・ＯＦＦ させるようにしてある。上記ロッド
３１と筒状体３２とは、同図に示すように、ロッド３１
の拡径部を筒状体３２内に、抜止め状態に且つ進退可能
に収容させると共に前記拡径部と筒状体３２の閉塞端と
の間にスプリング３４を介在させるようにして取付けて
あり、これにより、筒状体３２が近接スイッチ３３に最
接近した状態から更にロッド３１に押込力が作用したと
きでも車軸の上下運動を妨げることなく近接スイッチ３
３のＯＮ状態が維持できるようにしてあり、又、ロッド
３１の押込力が解除されたときには筒状体３２が近接ス
イッチ３３に離反して、前記近接スイッチ３３のＯＦＦ
状態が維持されるようにしてある。そして、上記近接
スイッチ３３は、図４に示す如く、螺合する態様でケー
ス３０に取付けられていると共に近接スイッチ３３のケ
ース３０へのネジ込み量を調整することによりＯＮ・Ｏ
ＦＦ位置の設定調整が行えるようにしてある。As shown in FIG. 4, the level detector 3 includes a magnetic cylindrical body 32 attached to one end of a rod 31.
is moved forward and backward within a cylindrical case 30, and the output is turned on and off by connecting and separating the rod 31 and a proximity switch 33 disposed in the case 30. As shown in the figure, the rod 31 and the cylindrical body 32 are
The enlarged diameter portion is accommodated in the cylindrical body 32 in a manner that it is prevented from coming out and can be moved back and forth, and a spring 34 is interposed between the enlarged diameter portion and the closed end of the cylindrical body 32. As a result, even when a pushing force is further applied to the rod 31 from the state where the cylindrical body 32 is closest to the proximity switch 33, the proximity switch 3 can be moved without interfering with the vertical movement of the axle.
3 can be maintained in the ON state, and when the pushing force of the rod 31 is released, the cylindrical body 32 is separated from the proximity switch 33, and the proximity switch 33 is turned OFF.
The state is maintained. The proximity switch 33 is attached to the case 30 in a screwed manner as shown in FIG.
It is possible to adjust the settings of the FF position.
【００１２】又、レベル検出器４は、上記したレベル検
出器３と同様の構成としてあり、ケース４０，ロッド４
１，筒状体４２，近接スイッチ４３，スプリング４４と
から構成されている。尚、この実施例のものでは、特に
、上記レベル検出器３における近接スイッチ３３のケー
ス３０へのネジ込量をレベル検出器４における近接スイ
ッチ４３のケース４０へのネジ込量よりも小さく設定し
てあり、レベル調整時や走行時における不安定作動を防
止ならしめている。
又、上記レベル検出器３，４は上記したように車台フレ
ーム１と下側トルクロッド２０との間に取付けてあるが
、その取付け態様は、図２に示す如く、車台フレーム１
に筒体ケース３０，４０側を、下側トルクロッド１２に
ロッド３１，４１側を、それぞれ取付けてあり、レベル
検出器３，４は下側トルクロッド２０を介して並設させ
たものとしてある。Further, the level detector 4 has the same structure as the above-mentioned level detector 3, and includes a case 40 and a rod 4.
1, a cylindrical body 42, a proximity switch 43, and a spring 44. In this embodiment, in particular, the screwing amount of the proximity switch 33 into the case 30 of the level detector 3 is set smaller than the screwing amount of the proximity switch 43 into the case 40 of the level detector 4. This prevents unstable operation when adjusting the level or when driving. Further, the level detectors 3 and 4 are installed between the chassis frame 1 and the lower torque rod 20 as described above, but the manner in which they are attached is as shown in FIG.
The cylindrical case 30, 40 side is attached to the lower torque rod 12, and the rod 31, 41 side is attached to the lower torque rod 12, respectively, and the level detectors 3, 4 are arranged in parallel via the lower torque rod 20. .
【００１３】他方、この荷役運搬車両では、昇降シリン
ダ３、４により荷台２の昇降操作をした直後から数秒間
（例えば、２〜１０秒間程度）のみ車高調整が行われる
ようにする為に、図３に示すような油圧系−電気系回路
を採用している。油圧系回路は、図３に示すように、基
本的にはタンク５０、ポンプ５１、リリーフ弁５２、電
磁弁５３〜５７、油圧シリンダ５，５、アキュムレータ
５１，５１を有すると共にこれらのそれぞれを同図の如
く接続してあり、又、電気系回路は、図３に示すように
、昇降シリンダ１１，１２を操作する操作レバーと連動
して開閉する連動スイッチ６，６、この連動スイッチ６
，６のＯＮ状態から一定時間通電させるタイマ６０、近
接スイッチ３３，４３を有するレベル検出器３，４、リ
レースイッチ６１，６２を有すると共に同図に示す如く
これらのそれぞれを接続し、且つ、上記油圧系回路の機
器の電気入力部に接続してある。尚、上記連動スイッチ
６，６は中央ＯＦＦ 、両端ＯＮの３位置を有するもの
で、これは荷役装置の切換レバーの中央−中立、両端は
シリンダの伸縮の３位置はそれぞれ対応させてある。又
、スイッチ６３は、長時間の不使用状態が招く、油圧シ
リンダ５，５からの油の洩れを補給する為の補正用スイ
ッチであり、押金スイッチ（ばね自動復帰タイプ）の手
動操作によりレベルング調整が行われる。On the other hand, in this cargo handling and transportation vehicle, in order to adjust the vehicle height only for a few seconds (for example, about 2 to 10 seconds) immediately after the lifting cylinders 3 and 4 lift and lower the loading platform 2, A hydraulic-electrical circuit as shown in Fig. 3 is adopted. As shown in FIG. 3, the hydraulic system circuit basically includes a tank 50, a pump 51, a relief valve 52, solenoid valves 53 to 57, hydraulic cylinders 5, 5, and accumulators 51, 51, and each of these is the same. The electrical circuits are connected as shown in the figure, and as shown in FIG.
, 6 for a certain period of time from the ON state, level detectors 3 and 4 having proximity switches 33 and 43, and relay switches 61 and 62, each of which is connected as shown in the same figure, and the above-mentioned It is connected to the electrical input section of the hydraulic circuit equipment. The interlocking switches 6, 6 have three positions, OFF at the center and ON at both ends, which correspond to the center-neutral position of the switching lever of the cargo handling device, and the three positions at both ends correspond to the expansion and contraction positions of the cylinder. In addition, the switch 63 is a correction switch for replenishing oil leakage from the hydraulic cylinders 5, 5 caused by long periods of non-use, and can be leveled by manual operation of a push button switch (spring automatic return type). Adjustments will be made.
【００１４】この実施例のものは、上記のように構成さ
れているから、昇降シリンダ１１，１２を駆動させる操
作レバーの操作により荷台１０を昇降させると、荷台１
０が路面と接地した状態（以下、この荷台１０の状態を
空車状態という）したり、荷台１０が路面から離れて車
両に積載された状態（以下、この荷台１０の状態を積車
状態という）となり、タイヤ反力が増減して輸荷重（軸
荷重）が変化する。即ち、上記操作レバーの操作をする
と、連動スイッチ６，６は通電状態となり、タイマ６０
を介して近接スイッチ３３，４３が通電状態になると共
にリレースイッチ６１，６２の電源側の接点も通電状態
となり、更に、レベリング用の油圧ポンプ５１のアンロ
ード用として設けた電磁弁５３は通電状態となる。そし
て、作業者が荷台１０の昇降用の操作レバーを中立にし
ても、連動スイッチ６，６が中立−ＯＦＦ 状態になる
以外、近接スイッチ３３， ３４、リレースイッチ６１
，６２等の機器はタイマ６０の設定時間（操作レバーの
操作時から２〜１０秒程度）上記状態が維持される。Since this embodiment is constructed as described above, when the loading platform 10 is raised or lowered by operating the operating lever that drives the lifting cylinders 11 and 12, the loading platform 1
0 is in contact with the road surface (hereinafter, this state of the loading platform 10 is referred to as an empty vehicle state), or a state in which the loading platform 10 is separated from the road surface and loaded on the vehicle (hereinafter, this state of this loading platform 10 is referred to as a loaded state). As a result, the tire reaction force increases or decreases, and the transport load (axle load) changes. That is, when the operation lever is operated, the interlocking switches 6, 6 are energized, and the timer 60 is turned on.
The proximity switches 33 and 43 are energized through the switch, and the contacts on the power supply side of the relay switches 61 and 62 are also energized, and furthermore, the solenoid valve 53 provided for unloading the leveling hydraulic pump 51 is energized. becomes. Even if the operator sets the operating lever for raising and lowering the loading platform 10 to neutral, the proximity switches 33, 34 and the relay switch 61 except that the interlocking switches 6, 6 are in the neutral-OFF state.
, 62, etc. are maintained in the above state for the time set by the timer 60 (approximately 2 to 10 seconds from the time the operating lever is operated).
【００１５】したがって、積荷作業が終了して空車状態
から積車状態にすると、輸荷重の増加に伴い油圧シリン
ダ５、５の全長が縮小して各アキュームレータ５１に作
用する圧力は増加することとなるが、このとき、レベル
検出器３，４の全長の短縮に伴い近接スイッチ３３、４
３はＯＮ状態となるのでリレースイッチ６１，６２もＯ
Ｎ状態となり、電磁弁５４，５６は開弁せしめられると
共に電磁弁５５，５７は閉弁を維持する。即ち、油圧シ
リンダ５の油が電磁弁５５，５７を介してタンク５０に
排出されることなく、タンク５０内の油が電磁弁５４，
５６を介して各シリンダ５に供給されることとなり、油
圧シリンダ５，５の全長は長伸せしめられることとなる
。[0015] Therefore, when the loading operation is completed and the car is changed from an empty state to a loaded state, the total length of the hydraulic cylinders 5, 5 decreases as the load increases, and the pressure acting on each accumulator 51 increases. However, at this time, due to the shortening of the overall length of the level detectors 3 and 4, the proximity switches 33 and 4
3 is in the ON state, so the relay switches 61 and 62 are also in the O state.
In the N state, the solenoid valves 54 and 56 are opened, and the solenoid valves 55 and 57 remain closed. That is, the oil in the tank 50 is not discharged into the tank 50 via the solenoid valves 55 and 57, and the oil in the tank 50 is discharged through the solenoid valves 54 and 57.
It will be supplied to each cylinder 5 via 56, and the total length of the hydraulic cylinders 5, 5 will be extended.
【００１６】ここで、上記油圧シリンダ５，５の伸長が
所定に達すると、レベル検出器３，４の近接スイッチ３
３がＯＦＦ 状態となり（近接スイッチ３３，４３の位
置調整によりこの作用を奏する） 、リレースイッチ６
１がＯＦＦ →電磁弁５４，５６が閉弁となって油圧シ
リンダ５，５への油の供給は停止される。即ち、車両の
車高は所定の高さで維持されることとなる。Here, when the extension of the hydraulic cylinders 5, 5 reaches a predetermined value, the proximity switches 3 of the level detectors 3, 4 are activated.
3 is in the OFF state (this effect is achieved by adjusting the positions of proximity switches 33 and 43), and relay switch 6
1 is OFF → the electromagnetic valves 54 and 56 are closed, and the supply of oil to the hydraulic cylinders 5 and 5 is stopped. That is, the height of the vehicle is maintained at a predetermined height.
【００１７】又、上記とは逆に、積荷作業が終了して積
車状態から空車状態にすると、輸荷重の減少に伴いシリ
ンダ５，５の全長が長伸して各アキュームレータ５１に
作用する圧力は減少することとなるが、このとき、レベ
ル検出器３，４の全長の長伸に伴い近接スイッチ３３、
４３はＯＦＦ 状態となるのでリレースイッチ６１，６
２もＯＦＦ 状態となり、電磁弁５４，５６は閉弁せし
められると共に電磁弁５５，５７は開弁を維持する。即
ち、タンク５０内の油が電磁弁５４，５６を介して各シ
リンダ５に供給されることなく、タンク５０内に油が電
磁弁５４，５６を介して各シリンダ５から排出されるこ
ととなり、油圧シリンダ５，５の全長は短縮せしめられ
ることとなる。Contrary to the above, when the loading operation is completed and the loaded state is changed to the empty state, the total length of the cylinders 5, 5 is elongated as the transport load decreases, and the pressure acting on each accumulator 51 is increased. will decrease, but at this time, as the total length of the level detectors 3 and 4 increases, the proximity switch 33,
Since 43 is in the OFF state, relay switches 61 and 6
2 is also turned off, and the solenoid valves 54 and 56 are closed, while the solenoid valves 55 and 57 remain open. That is, the oil in the tank 50 is not supplied to each cylinder 5 via the electromagnetic valves 54, 56, but the oil in the tank 50 is discharged from each cylinder 5 via the electromagnetic valves 54, 56. The total length of the hydraulic cylinders 5, 5 will be shortened.
【００１８】ここで、上記油圧シリンダ５，５の短縮が
所定に達すると、レベル検出器３，４の近接スイッチ４
３がＯＮ状態となり（近接スイッチ３３，４３の位置調
整によりこの作用を奏する） 、リレースイッチ６２が
ＯＦＦ →電磁弁５５，５５が閉弁となって油圧シリン
ダ５，５からタンク５０への排出は停止される。即ち、
車両の車高は所定の高さで維持されることとなる。Here, when the hydraulic cylinders 5, 5 are shortened to a predetermined value, the proximity switches 4 of the level detectors 3, 4 are activated.
3 is turned on (this effect is achieved by adjusting the position of the proximity switches 33, 43), the relay switch 62 is turned OFF → the solenoid valves 55, 55 are closed, and the discharge from the hydraulic cylinders 5, 5 to the tank 50 is stopped. will be stopped. That is,
The height of the vehicle will be maintained at a predetermined height.
【００１９】この実施例のものでは、走行時車輪が上下
運動してレベリング調整が困難な場合でも、確実にレベ
リング調整でき、このレベリング調整時において、リレ
ースイッチや電磁弁等の機械的な作動部分の不必要な作
動回数が少ないことから、寿命が増大する。In this embodiment, even if the wheels move up and down while driving and it is difficult to adjust the leveling, the leveling can be adjusted reliably. The service life is increased due to fewer unnecessary activations.
【００２０】[0020]
【発明の効果】この出願の発明は、上述の如くの構成を
有するものであるから、次の効果を有する。この出願の
発明のものでは、従来のものの欠点であった■「機器の
短命化」■「自励振動を誘起するなどの障害を起こす」
■「装置を作動させる油圧源の圧力を保持するために多
くの動力を損失する」を回避できることとなる。Effects of the Invention Since the invention of this application has the above-described configuration, it has the following effects. The invention of this application has the disadvantages of the conventional one: ■ "Short life of equipment" ■ "Causes troubles such as inducing self-excited vibration"
■It is possible to avoid ``a lot of power being lost in order to maintain the pressure of the hydraulic power source that operates the device.''
【００２１】即ち、社会に有用な優れた荷役運搬車両が
提供できた。In other words, an excellent cargo handling vehicle useful to society could be provided.
【図１】この出願の発明の荷役運搬車両の全体図。FIG. 1 is an overall view of a cargo handling vehicle according to the invention of this application.
【図２】前記荷役運搬車両の懸架装置と車輪との関係を
示す図。FIG. 2 is a diagram showing the relationship between the suspension system and wheels of the cargo handling vehicle.
【図３】前記荷役運搬車両が有する油圧系−電気系回路
の説明図。FIG. 3 is an explanatory diagram of a hydraulic system-electrical system circuit included in the cargo handling vehicle.
【図４】前記荷役運搬車両における懸架装置のレベル検
出器。FIG. 4 is a level detector of a suspension system in the cargo handling vehicle.
１ 台車フレーム ５ 油圧シリンダ 1 Trolley frame 5 Hydraulic cylinder
Claims (2)
ンダを介して車台フレーム側の重量を車軸にかけてあり
且つ前記油圧シリンダ内の油量変化により前記車台フレ
ームと車軸間距離が変化させ得る油圧式懸架装置と、積
載物の積卸時において荷台を上下動させる昇降装置とを
有する荷役運搬車両に於いて、昇降装置の操作に伴って
車台フレームと車軸間距離が一定以下になったとき、そ
れを検出するスイッチの出力により開弁せしめられて上
記油圧シリンダに油の供給を行う電磁弁と、昇降装置の
操作に伴って車台フレームと車軸間距離が一定以上にな
ったとき、それを検出するスイッチの出力により開弁せ
しめられて油圧シリンダの油の排出を行う電磁弁と、前
記昇降装置の作動中及び作動直後の数秒間のみ上記スイ
ッチの出力状態を維持させるタイマとを具備させた荷役
運搬用車両。1. A hydraulic suspension system that applies the weight of an undercarriage frame to an axle via a hydraulic cylinder connected to an accumulator, and that can change the distance between the undercarriage frame and the axle by changing the amount of oil in the hydraulic cylinder. , in a cargo handling and transportation vehicle equipped with a lifting device that moves the loading platform up and down during loading and unloading, detects when the distance between the chassis frame and the axle falls below a certain level due to the operation of the lifting device. A solenoid valve that is opened by the output of a switch to supply oil to the hydraulic cylinder, and an output of a switch that detects when the distance between the chassis frame and the axle exceeds a certain level due to operation of the lifting device. A cargo handling/transporting vehicle equipped with a solenoid valve that is opened to discharge oil from a hydraulic cylinder, and a timer that maintains the output state of the switch only for a few seconds during and immediately after the operation of the lifting device.
になったときを検出するスイッチと、それが一定以上に
なったときを検出するスイッチとの検出位置を一定以上
の間隔を設けたことを特徴とする請求項１記載の荷役運
搬用車両。[Claim 2] The detection position of a switch that detects when the distance between the chassis frame and the axle becomes less than a certain value and a switch that detects when the distance becomes more than a certain value are set at a distance of more than a certain value. The cargo handling and transportation vehicle according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP708191A JPH04243610A (en) | 1991-01-24 | 1991-01-24 | Cargo handling transportation vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP708191A JPH04243610A (en) | 1991-01-24 | 1991-01-24 | Cargo handling transportation vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04243610A true JPH04243610A (en) | 1992-08-31 |
Family
ID=11656140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP708191A Pending JPH04243610A (en) | 1991-01-24 | 1991-01-24 | Cargo handling transportation vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04243610A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107053986A (en) * | 2017-01-20 | 2017-08-18 | 徐州徐工汽车制造有限公司 | A kind of five axle dumper hydro pneumatic suspension hydraulic control systems |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5063618A (en) * | 1973-10-12 | 1975-05-30 | ||
| JPS5699808A (en) * | 1980-01-16 | 1981-08-11 | Nissan Motor Co Ltd | Regulator for vehicle height |
-
1991
- 1991-01-24 JP JP708191A patent/JPH04243610A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5063618A (en) * | 1973-10-12 | 1975-05-30 | ||
| JPS5699808A (en) * | 1980-01-16 | 1981-08-11 | Nissan Motor Co Ltd | Regulator for vehicle height |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107053986A (en) * | 2017-01-20 | 2017-08-18 | 徐州徐工汽车制造有限公司 | A kind of five axle dumper hydro pneumatic suspension hydraulic control systems |
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