公开(公告)号：EP0779451A1

公开(公告)日：1997-06-18

申请号：EP96117371.3

申请日：1996-10-30

申请人： TSUBAKIMOTO CHAIN CO.

发明人： Nakakubo, Katsuya ,  Miyake, Hiroyuki ,  Fujiwara, Toru

IPC分类号： F16H7/12

CPC分类号： F16H7/08 ,  F16H7/0829 ,  F16H7/0848 ,  F16H2007/0806 ,  F16H2007/0812 ,  F16H2007/0859 ,  F16H2007/0891

摘要： [Object] To provide a hydraulic tensioner which has a small number of components and hence can be reduced in size, enables the oil to flow into the high pressure chamber side in a short time and hence is able to efficiently dampen vibrations of the plunger.
[Means for Achieving the Object] A hydraulic tensioner includes a plunger (3) slidably fitted in a cylinder (5) disposed in a tensioner body (2), a reservoir chamber (10) formed in the tensioner body at a lower portion of the cylinder, a check valve (13) permitting flow of an oil in a single direction from the reservoir chamber into the cylinder which is formed as a high pressure chamber (8), a low pressure chamber (19) formed in the tensioner body exteriorly of the cylinder, an oil passage (7) connecting a bottom of the low pressure chamber to a position between the check valve and the reservoir chamber, and a spring (16) urging sand plunger upwardly, wherein the low pressure chamber contains an air layer (4) formed above a surface of the oil held in the lower pressure chamber.

摘要翻译： 本发明的目的在于提供一种零件数量少且能够小型化的液压张紧装置，能够在短时间内使油流入高压室侧，因此能够有效地抑制柱塞的振动。 实现目的的手段液压张紧器包括可滑动地安装在设置在张紧器本体（2）中的缸体（5）中的柱塞（3），形成在张紧器本体中的储存器室（10） 一个止回阀（13），该止回阀允许油从单一方向从储存室流入形成为高压室（8）的缸内;低压室（19），其形成在张紧器本体的外部 缸体，将低压室的底部连接到止回阀和储存室之间的油道（7）以及向上推动砂塞的弹簧（16），其中低压室包含空气层（ 形成在保持在低压室中的油的表面上方。