JPH0277362U - - Google Patents

Description

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

第１図は本考案によるピストンシール構造の第
１の一実施例を示す部分断面図、第２図は第１図
の要部拡大断面図、第３図は同変形例を示す断面
図、第４図は本考案によるピストンシール構造の
第２の実施例を示す要部拡大断面図、第５図は同
変形例を示す断面図、第６図は本考案によるピス
トンシール構造の第３の実施例を示す要部拡大断
面図である。 符号の説明、１１……シリンダ、１１ａ……内
周面、１３……ピストン、１３ａ……環状溝、１
３ａ１，１３ａ２……側壁面、１４……シール部
材、１４ａ……内周部、１４ａ１，１４ａ２……
側壁面、１４ｂ……外周部、１４ｂ１……外周面
、Ｒ１，Ｒ２……圧力室。 1 is a partial sectional view showing a first embodiment of the piston seal structure according to the present invention, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is a sectional view showing a modification of the same; FIG. 4 is an enlarged cross-sectional view of main parts showing a second embodiment of the piston seal structure according to the present invention, FIG. 5 is a cross-sectional view showing a modification of the same, and FIG. 6 is a third embodiment of the piston seal structure according to the present invention. FIG. 2 is an enlarged sectional view of a main part showing an example. Explanation of symbols, 11... Cylinder, 11a... Inner peripheral surface, 13... Piston, 13a... Annular groove, 1
3a1, 13a2...Side wall surface, 14...Sealing member, 14a...Inner peripheral part, 14a1, 14a2...
Side wall surface, 14b...outer circumference, 14b1...outer circumference, R1, R2...pressure chamber.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] シリンダ内を軸方向に摺動するピストンの外周
に環状溝を形成し、この環状溝に前記シリンダの
内周面に外周面にて摺接するシール部材を収納し
、前記ピストンの両側に形成される圧力室内の圧
力が前記シール部材に作用するようにして、前記
シール部材が前記環状溝の側壁面と前記シリンダ
の内周面に圧接するように構成したピストンシー
ル構造において、前記シール部材をその内周部よ
り外周部の軸方向厚みが大きくかつその内周部の
側壁面が前記環状溝の側壁面に平面当りする形状
とし、また同シール部材の少なくとも内周部の軸
方向厚みを前記環状溝の軸方向溝幅と略同一とし
たことを特徴とするピストンシール構造。 An annular groove is formed on the outer periphery of a piston that slides in the axial direction within the cylinder, and a sealing member that slides on the outer circumferential surface of the inner circumferential surface of the cylinder is housed in the annular groove, and is formed on both sides of the piston. In the piston seal structure, the seal member is configured to press against a side wall surface of the annular groove and an inner circumferential surface of the cylinder so that the pressure within the pressure chamber acts on the seal member. The outer peripheral part has a larger axial thickness than the peripheral part, and the side wall surface of the inner peripheral part is shaped so as to be in plane contact with the side wall surface of the annular groove, and the axial thickness of at least the inner peripheral part of the seal member is larger than that of the annular groove. A piston seal structure characterized in that the width of the axial groove is approximately the same as that of the piston seal.