JPH0415523Y2 - - Google Patents
Info
- Publication number
- JPH0415523Y2 JPH0415523Y2 JP1984128645U JP12864584U JPH0415523Y2 JP H0415523 Y2 JPH0415523 Y2 JP H0415523Y2 JP 1984128645 U JP1984128645 U JP 1984128645U JP 12864584 U JP12864584 U JP 12864584U JP H0415523 Y2 JPH0415523 Y2 JP H0415523Y2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- hydraulic
- receiving area
- axle
- hydraulic cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Jib Cranes (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案はクレーン車特にクレーンブームの旋回
中心を前後軸の一方に偏寄させた車両の車枠と左
右一対の前輪および後輪との間にそれぞれ油圧シ
リンダを介装するとともにこれら油圧シリンダの
ピストンロツド側油室を切換バルブを介して選択
的に油圧源に接続し懸架ばねをロツクし得るよう
にした懸架ばねロツク装置に関する。[Detailed description of the invention] [Field of industrial application] The invention is based on a crane vehicle, particularly a crane boom, which is located between the vehicle frame and a pair of left and right front wheels and rear wheels, in which the center of rotation of the crane boom is biased toward one of the front and rear axes. The present invention relates to a suspension spring locking device which is equipped with hydraulic cylinders, and in which the piston rod side oil chambers of these hydraulic cylinders are selectively connected to a hydraulic power source via a switching valve to lock the suspension springs.
［従来技術］
クレーン車のオンタイヤすなわち車体固定用に
張り出させるアウトリガーを使用しないで荷重を
吊り上げることができるように、車枠と車輪間に
それぞれ介装した油圧シリンダのピストンロツド
側油室と油圧源を接続して車輪の懸架ばねをロツ
クし得るようにした懸架ばねのロツク装置は、例
えば実公昭57−36492号公報によるものなどが知
られている。[Prior art] In order to be able to lift a load without using the on-tires of a crane vehicle, that is, the outriggers that protrude to secure the vehicle body, an oil chamber and a hydraulic power source on the piston rod side of a hydraulic cylinder are installed between the vehicle frame and the wheels. A suspension spring locking device that can lock the suspension spring of a wheel by connecting the same is known, for example, as disclosed in Japanese Utility Model Publication No. 57-36492.
一方、クレーンブームの旋回中心は、前後車輪
の中心に置くのが、車軸の荷重分布上から好まし
いことは周知である。しかし、全体のレイアウト
上、例えば運転席を車両前部に配置するあるいは
ブームの長さが長いなどの理由で、クレーンブー
ムの旋回中心を前軸又は後軸の方に偏寄させなけ
ればならない場合がある。 On the other hand, it is well known that it is preferable to place the turning center of the crane boom at the center of the front and rear wheels from the viewpoint of load distribution on the axle. However, in cases where the crane boom's rotation center must be biased towards the front or rear axle due to the overall layout, for example, the driver's seat is located at the front of the vehicle or the boom is long. There is.
この場合、オンタイヤで側方吊りすなわちクレ
ーンブームを車両中心線に対し略直交させて吊る
場合は、クレーンブームの旋回中心の偏寄した側
の車軸の荷重と対向する側の油圧シリンダは、荷
重側の懸架ばねを支点として上方に引張られ、こ
のため、ピストンロツド側油室の内圧が上昇し、
その結果、ピストンのパツキンやパイロツトチエ
ツク弁などの部品が損傷し、ロツクが不完全とな
ることがあり危険である。 In this case, when the crane boom is suspended from the side on the tires, that is, when the crane boom is suspended approximately perpendicular to the vehicle center line, the hydraulic cylinder on the side opposite to the load on the axle on the side where the center of rotation of the crane boom is biased is It is pulled upward using the suspension spring on the side as a fulcrum, and as a result, the internal pressure in the oil chamber on the piston rod side increases.
As a result, parts such as the piston seal and pilot check valve may be damaged, resulting in incomplete locking, which is dangerous.
この問題を解決するため、本出願人は先に実願
昭58−195021号実開昭60−103010号において、旋
回中心が偏寄した側の車輪の油圧シリンダの受圧
面積を他方の側の油圧シリンダの受圧面積より大
きくし、更に大きい方の油圧シリンダへの供給油
圧を減圧するようにした装置を提案している。し
かし、この装置では構造が複雑となる。 In order to solve this problem, the applicant previously proposed in Utility Application No. 58-195021 and Utility Model Application No. 60-103010 that the pressure-receiving area of the hydraulic cylinder of the wheel on the side where the turning center is biased is determined by the pressure receiving area of the hydraulic cylinder on the other side. We have proposed a device that has a pressure receiving area larger than the pressure receiving area of the cylinder and reduces the pressure of the hydraulic pressure supplied to the larger hydraulic cylinder. However, this device has a complicated structure.
［考案の目的］
本考案は上記した問題に鑑みてなされたもの
で、その目的は、オンタイヤ側方吊り時にクレー
ンブームの偏寄した側の油圧シリンダの過度の内
圧上昇を抑止し得るようにした構造簡単な懸架ば
ねロツク装置を提供するにある。[Purpose of the invention] The present invention was made in view of the above-mentioned problems, and its purpose is to prevent an excessive increase in internal pressure in the hydraulic cylinder on the side where the crane boom is biased when on-tire side suspension. The structure is to provide a simple suspension spring locking device.
［考案の構成］
本考案によれば、クレーンブームの旋回中心を
前後軸の一方に偏寄させた車両の車枠と左右一対
の前輪および後輪との間にそれぞれ油圧シリンダ
を介装するとともにこれら油圧シリンダのピスト
ンロツド側油室を切換バルブを介して選択的に油
圧源に接続し懸架ばねをロツクし得るようにした
懸架ばねロツク装置において、クレーンブームの
旋回中心から一方の車軸までの距離をL1とし、
他方の車軸までの距離をL2とし、一方の車軸の
車輪の油圧シリンダの受圧面積をA1とし、他方
の車軸の車輪の油圧シリンダの受圧面積をA2と
し、それらの受圧面積と距離との関係がほぼ
A2：A1＝L1：L2に設定されている。[Structure of the invention] According to the invention, hydraulic cylinders are interposed between the vehicle frame and a pair of left and right front wheels and a pair of rear wheels, respectively, and the center of rotation of the crane boom is biased toward one of the front and rear axes. In a suspension spring locking device in which the oil chamber on the piston rod side of a hydraulic cylinder is selectively connected to a hydraulic power source via a switching valve to lock the suspension spring, the distance from the center of rotation of the crane boom to one axle is L. 1 ,
The distance to the other axle is L 2 , the pressure receiving area of the hydraulic cylinder of the wheel of one axle is A 1 , the pressure receiving area of the hydraulic cylinder of the wheel of the other axle is A 2 , and their pressure receiving area and distance are The relationship between
It is set as A 2 :A 1 =L 1 :L 2 .
［考案の作用効果］
したがつて、距離L1，L2と油圧シリンダの受
圧面積とはほぼ反比例しており、距離の短い方の
受圧面積が大きく、そのためにクレーンブームの
旋回中心からの長さが短く偏倚した方の油圧シリ
ンダの受圧面積の大きい分だけ、オンタイヤ側方
吊り時の内圧上昇に対して、内圧の過度の上昇が
抑止される。そして前述の如くほぼ反比例してい
るので、両油圧シリンダの内圧がほぼ等しくなり
結局過度の内圧上昇がない。[Effects of the invention] Therefore, the distances L 1 and L 2 are almost inversely proportional to the pressure-receiving area of the hydraulic cylinder, and the pressure-receiving area of the shorter distance is larger, so the length from the center of rotation of the crane boom is Due to the larger pressure-receiving area of the hydraulic cylinder with the shorter and more biased side, an excessive increase in internal pressure is suppressed compared to the increase in internal pressure when the tire is suspended from the side. As described above, since they are approximately inversely proportional, the internal pressures of both hydraulic cylinders are approximately equal, and as a result, there is no excessive increase in internal pressure.
それ故に、部品の損傷が防止され、安全性と寿
命とが向上できる。また構造が簡単化され、コス
トが低減される。 Therefore, damage to parts can be prevented and safety and lifespan can be improved. Furthermore, the structure is simplified and costs are reduced.
［実施例］
以下図面を参照して本考案の実施例を旋回中心
が後軸側に偏寄した場合について詳細に説明す
る。[Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings for a case where the turning center is biased toward the rear axle side.
第１図および第２図におて、車枠１には、前輪
２，２′後輪３，３′がそれぞれ懸架ばね４，４′
（前輪用は図示せず）を介して懸架されている。
クレーンブーム５の旋回中心Ｃは、前軸６と後軸
７の間すなわちホイールベースＷ間で後軸７側に
偏寄され、ホイルベースＷをL1：L2の比率で分
割している。車枠１の四隅には、吊上げ時に車体
を固定させるためのアウトリガー８，８′，９，
９′が配設されている。 1 and 2, front wheels 2, 2' and rear wheels 3, 3' are mounted on a vehicle frame 1 with suspension springs 4, 4', respectively.
(The front wheels are not shown).
The turning center C of the crane boom 5 is biased toward the rear shaft 7 between the front shaft 6 and the rear shaft 7, that is, between the wheel base W, and divides the wheel base W at a ratio of L 1 :L 2 . At the four corners of the vehicle frame 1, there are outriggers 8, 8', 9,
9' is provided.
一方、車枠１と各車輪２，２′，３，３′との間
には、詳細を第３図に示す前輪用の油圧シリンダ
１０，１０′と後輪用の油圧シリンダ１１，１
１′が介装されている。この油圧シリンダ１０，
１０′および１１，１１′は、それぞれそのボトム
エンドを車枠１へ枢着したシリンダ本体１２およ
び１３、シリンダ本体１２，１３内に油密的に摺
動自在に嵌挿しピストンロツド側油室１４，１５
と非ピストン側室１６，１７とに画成するピスト
ン１８，１９およびその基端をピストンへ連結し
その先端を前軸６、後軸７へ枢着したピストンロ
ツド２０，２１からなつており、ピストン１９の
受圧面積A2は、ピストン１８の受圧面積A1に対
しA2：A1＝L1：L2のように大きく設定されてい
る。これら油圧シリンダ１０，１０′および１１，
１１′のピストンロツド側油室１４および１５は、
それぞれパイロツトチエツク弁２２を介して切換
バルブ２３に配管２４によつて接続されており、
切換バルブ２３の操作によりタンク２７あるいは
油圧源すなわちポンプ２８に選択的に接続しうる
ようになつている。前記パイロツトチエツク弁２
２は、そのパイロツト圧導入管２９によつてパイ
ロツト圧が作用したときに、ピストンロツド側油
室１４，１５から切換バルブ２３方向への作動油
の流れを許容するようになつている。各パイロツ
ト圧導入管２９は、単一の切換バルブ３０に接続
されており、切換バルブ３０の操作によりタンク
３１あるいはポンプ３２へ選択的に接続しうるよ
うになつている。また油圧シリンダ１０，１０′，
１１，１１′の非ピストンロツド側室１６，１７
はそれぞれ大気側に開放されている。 On the other hand, between the vehicle frame 1 and each wheel 2, 2', 3, 3', there are hydraulic cylinders 10, 10' for the front wheels and hydraulic cylinders 11, 1 for the rear wheels, the details of which are shown in FIG.
1' is interposed. This hydraulic cylinder 10,
Cylinder bodies 12 and 13 whose bottom ends are pivotally connected to the vehicle frame 1, respectively, and piston rod side oil chambers 14 and 15 which are slidably fitted into the cylinder bodies 12 and 13 in an oil-tight manner.
It consists of pistons 18, 19 defined in and non-piston side chambers 16, 17, and piston rods 20, 21 whose base ends are connected to the piston and whose tips are pivoted to the front shaft 6 and rear shaft 7. The pressure receiving area A 2 of the piston 18 is set to be larger than the pressure receiving area A 1 of the piston 18 as A 2 :A 1 =L 1 :L 2 . These hydraulic cylinders 10, 10' and 11,
The piston rod side oil chambers 14 and 15 of 11' are
Each is connected to a switching valve 23 via a pilot check valve 22 by a piping 24,
By operating a switching valve 23, it is possible to selectively connect to a tank 27 or a hydraulic source, ie, a pump 28. Said pilot check valve 2
2 allows hydraulic oil to flow from the piston rod side oil chambers 14, 15 toward the switching valve 23 when pilot pressure is applied through the pilot pressure introduction pipe 29. Each pilot pressure introduction pipe 29 is connected to a single switching valve 30, and can be selectively connected to a tank 31 or a pump 32 by operating the switching valve 30. In addition, hydraulic cylinders 10, 10',
11, 11' non-piston rod side chambers 16, 17
are each open to the atmosphere.
次に作動について説明する。 Next, the operation will be explained.
油圧シリンダ１０，１０′，１１，１１′は、通
常はポンプ３２とパイロツト圧導入管２９を接続
し、パイロツトチエツク弁２２を開放するととも
に、タンク２７と配管２４を接続した状態すなわ
ちピストンロツド側油室１４，１５をタンク２７
に連通した状態で使用される。 Normally, the hydraulic cylinders 10, 10', 11, 11' are connected to the pump 32 and the pilot pressure introduction pipe 29, the pilot check valve 22 is opened, and the tank 27 and the pipe 24 are connected, that is, the oil chamber on the piston rod side. 14, 15 to tank 27
It is used in communication with the
オンタイヤで荷重を吊り上げる場合は、切換バ
ルブ３０を操作してパイロツト圧導入管２９をタ
ンク３１に連通し、これによりピストンロツド側
油室１４，１５からの作動油の流出を遮断すると
ともに、切換バルブ２３を操作して配管２４とポ
ンプ２８とを連通し、これにより作動油をピスト
ンロツド側油室１４，１５へ供給し、各油圧シリ
ンダ１０，１０′，１１，１１′を縮少して、各懸
架ばねをロツクするのである。 When lifting a load on-tire, operate the switching valve 30 to connect the pilot pressure introduction pipe 29 to the tank 31, thereby blocking the flow of hydraulic oil from the piston rod side oil chambers 14, 15, and at the same time operating the switching valve 30. 23 to connect the piping 24 and the pump 28, thereby supplying hydraulic oil to the piston rod side oil chambers 14, 15, contracting each hydraulic cylinder 10, 10', 11, 11', and discharging each suspension. It locks the spring.
このオンタイヤで側方吊りをする場合は、第２
図に示すように、荷重Ｗにより、車枠は後輪３側
の懸架バネと車枠との接触点Ｐを中心として反時
計方向に回動され、すなわち後輪３′の油圧シリ
ンダ１１′は、上方に引き上げられ、それにより、
油圧シリンダ１１′のピストンロツド側油室１５
は圧縮され、その結果、内圧は供給油圧より更に
上昇する。しかし前述のようにピストン１９の受
圧面積A2はピストン１８の受圧面積A1に対し、
A2：A1＝L1：L2のように設定されているので、
油圧シリンダ１１′の引き上げによるピストンロ
ツド側室１５の内圧上昇は、油圧シリンダ１０′
のピストンロツド側室１４のそれに等しく、耐圧
限度内に抑えられる。すなわち、受圧面積を大き
く設定した分だけ、内圧の上昇分をカバーするこ
とができ、その結果、部品が損傷してロツクが不
完全となることを確実に防止出来るのである。 When hanging on the side with this on-tire, the second
As shown in the figure, due to the load W, the vehicle frame is rotated counterclockwise around the contact point P between the suspension spring on the rear wheel 3 side and the vehicle frame, that is, the hydraulic cylinder 11' of the rear wheel 3' is rotated upward. , and thereby
Piston rod side oil chamber 15 of hydraulic cylinder 11'
is compressed, and as a result, the internal pressure rises further than the supplied hydraulic pressure. However, as mentioned above, the pressure receiving area A 2 of the piston 19 is smaller than the pressure receiving area A 1 of the piston 18.
Since it is set as A 2 : A 1 = L 1 : L 2 ,
The increase in internal pressure in the piston rod side chamber 15 due to the lifting of the hydraulic cylinder 11' causes the increase in the internal pressure of the hydraulic cylinder 10'.
It is equal to that of the piston rod side chamber 14, and is suppressed within pressure limits. In other words, the increase in internal pressure can be compensated for by setting the pressure-receiving area large, and as a result, damage to parts and incomplete locking can be reliably prevented.
［まとめ］
以上説明したように本考案によれば、クレーン
ブームの旋回中心を偏寄した側の油圧シリンダの
面積を大きくした分だけ、オンタイヤ側方吊り時
の内圧上昇に対しては余裕を持ち得て内圧の過度
の上昇は抑止され、従つて部品の損傷が防止さ
れ、その結果、安全性と寿命が向上される。[Summary] As explained above, according to the present invention, by increasing the area of the hydraulic cylinder on the side where the center of rotation of the crane boom is biased, there is a margin for the increase in internal pressure when the crane boom is suspended from the side. An excessive rise in internal pressure can be inhibited, thus preventing damage to components, resulting in improved safety and service life.
第１図は本考案の適用されるクレーン車の側面
図、第２図は第１図の後面図、第３図は本考案の
１実施例を示す油圧回路図である。
１……車枠、２，２′……前輪、３，３′……後
輪、４……後輪の懸架ばね、５……クレーンブー
ム、１０，１０′，１１，１１′……油圧シリン
ダ、１４，１５……ピストンロツド側室、１８，
１９……ピストン。
FIG. 1 is a side view of a crane truck to which the present invention is applied, FIG. 2 is a rear view of FIG. 1, and FIG. 3 is a hydraulic circuit diagram showing one embodiment of the present invention. 1... Vehicle frame, 2, 2'... Front wheel, 3, 3'... Rear wheel, 4... Rear wheel suspension spring, 5... Crane boom, 10, 10', 11, 11'... Hydraulic cylinder , 14, 15...Piston rod side chamber, 18,
19... Piston.
Claims (1)
寄させた車両の車枠と左右一対の前輪および後輪
との間にそれぞれ油圧シリンダを介装するととも
にこれら油圧シリンダのピストンロツド側油室を
切換バルブを介して選択的に油圧源に接続し懸架
ばねをロツクし得るようにした懸架ばねロツク装
置において、クレーンブームの旋回中心から一方
の車軸までの距離をL1とし、他方の車軸までの
距離をL2とし、一方の車軸の車輪の油圧シリン
ダの受圧面積をA1とし、他方の車軸の車輪の油
圧シリンダの受圧面積をA2とし、それらの受圧
面積と距離との関係がほぼA2：A1＝L1：L2であ
ることを特徴とする懸架ばねロツク装置。 Hydraulic cylinders are interposed between the vehicle frame and the pair of left and right front wheels and rear wheels, with the center of rotation of the crane boom biased toward one of the front and rear axles, and a switching valve is installed in the oil chamber on the piston rod side of these hydraulic cylinders. In a suspension spring locking device that can be selectively connected to a hydraulic power source through a hydraulic power source to lock a suspension spring, the distance from the center of rotation of the crane boom to one axle is L1 , and the distance to the other axle is L1. 2 , the pressure-receiving area of the hydraulic cylinder of the wheel on one axle is A1 , and the pressure-receiving area of the hydraulic cylinder of the wheel on the other axle is A2 , and the relationship between the pressure-receiving area and distance is approximately A2 :A. A suspension spring locking device characterized in that 1 = L 1 :L 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12864584U JPS6143511U (en) | 1984-08-27 | 1984-08-27 | Suspension spring lock device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12864584U JPS6143511U (en) | 1984-08-27 | 1984-08-27 | Suspension spring lock device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6143511U JPS6143511U (en) | 1986-03-22 |
| JPH0415523Y2 true JPH0415523Y2 (en) | 1992-04-08 |
Family
ID=30687269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12864584U Granted JPS6143511U (en) | 1984-08-27 | 1984-08-27 | Suspension spring lock device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6143511U (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60103010U (en) * | 1983-12-20 | 1985-07-13 | 日産ディーゼル工業株式会社 | Suspension spring locking device |
-
1984
- 1984-08-27 JP JP12864584U patent/JPS6143511U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6143511U (en) | 1986-03-22 |
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