JPS6453645U

JPS6453645U -

Info

Publication number: JPS6453645U
Application number: JP14857887U
Authority: JP
Priority date: 1987-09-29
Filing date: 1987-09-29
Publication date: 1989-04-03

Description

[Brief explanation of drawings]

第１〜３図は本考案の実施例を示しており、第
１図は要部の拡大断面図、第２図は要部の断面図
、第３図は油圧ブレーキ装置の断面図、第４図は
第３図の―線断面図、第５図は従来技術を示
す断面図である。１……ミツシヨンケース、３……油圧ブレーキ
装置、８……デフ出力軸、９……ブレーキデイス
ク、１３……ブレーキケース、２２……シリンダ
孔、２３……ブレーキピストン、２４……フリク
シヨンプレート、２６……押圧面、２７……受圧
面、２８……大径周面、２９……小径周面、３１
……周溝、３２……シール体、３３……大摺接面
、３４……間隙、３５……小摺接面、３６……間
隙、３７……シール体、３８……周溝、４０……
油室。 1 to 3 show an embodiment of the present invention, FIG. 1 is an enlarged sectional view of the main part, FIG. 2 is a sectional view of the main part, FIG. 3 is a sectional view of the hydraulic brake device, and FIG. The figure is a sectional view taken along the line -- in FIG. 3, and FIG. 5 is a sectional view showing the prior art. 1...Mission case, 3...Hydraulic brake device, 8...Differential output shaft, 9...Brake disc, 13...Brake case, 22...Cylinder hole, 23...Brake piston, 24...Friction Plate, 26... Pressing surface, 27... Pressure receiving surface, 28... Large diameter circumferential surface, 29... Small diameter circumferential surface, 31
... Circumferential groove, 32 ... Seal body, 33 ... Large sliding contact surface, 34 ... Gap, 35 ... Small sliding contact surface, 36 ... Gap, 37 ... Seal body, 38 ... Circumferential groove, 40 ……
Oil room.

Claims

[Claims for Utility Model Registration] A pressing surface 26 that comes into contact with the brake disc 9;
Pressure receiving surface 2 that receives hydraulic pressure behind this pressing surface 26
7, and a large-diameter circumferential surface 28 and a small-diameter circumferential surface 29 on the side of the pressing surface 26 located axially sandwiching this pressure-receiving surface 27.
and a rectangular cross-section that fits into the cylinder hole 22 having a surface facing the large and small circumferential surfaces 28 and 29 so as to be slidable in the axial direction, and forms circumferential grooves 31 and 38 in the large and small circumferential surfaces 28 and 29 so as to come into sliding contact with the cylinder hole 22. Seal body 32, 37
A hydraulic brake device in which a gap 3 between the cylinder hole 22 and a small-diameter circumferential surface 29 is fitted therein.
The pressure receiving surface 27 of the circumferential groove 38 of the small diameter circumferential surface 29 is formed so that the gap 34 with the large diameter circumferential surface 28 is small.
A piston structure for a hydraulic brake device, characterized in that the chamfer of a shoulder portion 38a farthest from the periphery is larger than the shoulder portion of the circumferential groove 31 of the large-diameter circumferential surface 28.