SHOCK ABSORBER

• Main Authors: CHO YOSHI, KUBOTA NAOKI, MIWA MASAHIRO
• Format: Patent
• Language: English; Japanese
• Published: 19.09.2019
• Subjects: BLASTING; CYLINDERS; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MEANS FOR DAMPING VIBRATION; MECHANICAL ENGINEERING; PISTONS; SEALINGS; SHOCK-ABSORBERS; SPRINGS; THERMAL INSULATION IN GENERAL; WEAPONS

To prevent damage of an oil seal.SOLUTION: A shock absorber 10 includes: a bearing unit 140 having a bush 142 and a rod guide 141; and an oil seal unit 130 having an oil seal 132 and a seal housing 131. In the rod guide 141, a communication passage 146 for guiding a hydraulic oil in an extension side chamber 61 to an oil chamber 151 is provided. The seal housing 131 includes: a seal storage recess 134 where the oil seal 132 is stored; and an insertion hole 138 in which a piston rod 3 is inserted. The oil seal 132 is pressed against an outer peripheral surface of the piston rod 3 and the seal storage recess 134 by the hydraulic oil pressure of the extension side chamber 61 guided to the oil chamber 151. The bush 142 is provided so that an upper end surface 142a of the bush 142 opposing to the oil seal 132 coincides with an upper part opening surface 160a of a through-hole 160 of the rod guide 141.SELECTED DRAWING: Figure 3 【課題】オイルシールの損傷を防止する。【解決手段】ショックアブソーバ１０は、ブッシュ１４２及びロッドガイド１４１を有する軸受ユニット１４０と、オイルシール１３２及びシールハウジング１３１を有するオイルシールユニット１３０と、を備え、ロッドガイド１４１には、伸側室６１の作動油を油室１５１に導く連通路１４６が設けられ、シールハウジング１３１は、オイルシール１３２が収容されるシール収容凹部１３４と、ピストンロッド３が挿通される挿通孔１３８と、を有し、オイルシール１３２は、油室１５１に導かれる伸側室６１の作動油圧により、ピストンロッド３の外周面及びシール収容凹部１３４に押し付けられ、ブッシュ１４２は、オイルシール１３２に対向するブッシュ１４２の上端面１４２ａがロッドガイド１４１の貫通孔１６０の上部開口面１６０ａに一致するように設けられる。【選択図】図３