JPH01166101U

JPH01166101U -

Info

Publication number: JPH01166101U
Application number: JP5714588U
Authority: JP
Priority date: 1988-04-26
Filing date: 1988-04-26
Publication date: 1989-11-21

Description

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

第１図は本考案の実施例を示す油圧回路図、第
２図はその制振シリンダの具体的構造の一例を示
す断面図、第３図は制振シリンダの具体的構造の
他の例を示す断面図、第４図は本考案品と従来品
との圧力変動の勾配および揺動変位を比較するた
めの説明図、第５図は本考案が適用される油圧シ
ヨベルの側面図、第６図は従来の制振装置付油圧
シリンダの断面図である。１０…油圧ポンプ、１１…コントロールバルブ
、１２…タンク、１３，１４…管路、１５…油圧
シリンダ、１６…ヘツド側油室、１７…ロツド側
油室、２０…制振シリンダ、２１…シリンダケー
ス、２２…制振ピストン、２３，２４…制振室、
３０，３１…スローリターンチエツク弁、３０ａ
，３１ａ…絞り。 Fig. 1 is a hydraulic circuit diagram showing an embodiment of the present invention, Fig. 2 is a sectional view showing an example of the specific structure of the damping cylinder, and Fig. 3 is another example of the specific structure of the damping cylinder. FIG. 4 is an explanatory diagram for comparing the gradient of pressure fluctuation and rocking displacement between the product of the present invention and the conventional product. FIG. 5 is a side view of a hydraulic excavator to which the present invention is applied. The figure is a sectional view of a conventional hydraulic cylinder with a vibration damping device. 10... Hydraulic pump, 11... Control valve, 12... Tank, 13, 14... Piping, 15... Hydraulic cylinder, 16... Head side oil chamber, 17... Rod side oil chamber, 20... Vibration damping cylinder, 21... Cylinder case , 22... vibration damping piston, 23, 24... vibration damping chamber,
30, 31...Slow return check valve, 30a
, 31a...Aperture.

Claims

【実用新案登録請求の範囲】１油圧シリンダのヘツド側油室とロツド側油室
とが一対の管路によりコントロールバルブに接続
され、一方、シリンダケース内に制振ピストンを
軸方向に摺動自在に設けて制振シリンダが構成さ
れ、その内部には制振ピストンの両側で互いに独
立した一対の制振室が形成され、上記両管路のう
ち一方の管路が一方の制振室に、他方の管路が他
方の制振室にそれぞれ連通され、少なくとも一方
の管路と一方の制振室との連通路に絞りが設けら
れていることを特徴とする油圧シリンダの制振装
置。２上記各制振室と各管路との連通路にそれぞれ
スローリターンチエツク弁が設けられていること
を特徴とする請求項１記載の油圧シリンダの制振
装置。３上記制振ピストンが段付きピストンにより形
成され、その大径部と小径部に対応する大小二つ
の制振室が制振シリンダ内に形成され、大径側の
制振室と小径側の制振室との断面積比が、油圧シ
リンダのヘツド側油室とロツド側油室との断面積
比に対応するように設定されていることを特徴と
する請求項１または２記載の油圧シリンダの制振
装置。[Scope of Claim for Utility Model Registration] 1. A head side oil chamber and a rod side oil chamber of a hydraulic cylinder are connected to a control valve through a pair of pipes, while a vibration damping piston is slidable in the axial direction within the cylinder case. A damping cylinder is constructed by providing a damping cylinder, and a pair of damping chambers are formed therein, which are independent from each other on both sides of the damping piston, and one of the pipes is connected to one of the damping chambers. A vibration damping device for a hydraulic cylinder, characterized in that the other pipe line communicates with the other vibration damping chamber, and a restriction is provided in the communication passage between at least one pipe line and one vibration damping chamber. 2. The vibration damping device for a hydraulic cylinder according to claim 1, wherein a slow return check valve is provided in each communication path between each vibration damping chamber and each pipe line. 3 The damping piston is formed by a stepped piston, and two large and small damping chambers are formed in the damping cylinder, corresponding to the large diameter part and the small diameter part, and the damping chamber on the large diameter side and the damping chamber on the small diameter side 3. The hydraulic cylinder according to claim 1 or 2, wherein the cross-sectional area ratio with the swing chamber is set to correspond to the cross-sectional area ratio between the head side oil chamber and the rod side oil chamber of the hydraulic cylinder. Vibration damping device.