| 摘要 |
<P>PROBLEM TO BE SOLVED: To increase the strength of the whole end wall part while reducing a weight of the end wall part without using a reinforcing member beyond necessity in a shell structure of a negative pressure booster provided with the end wall part in which a diameter of a front shell half body constituting a part of a booster shell is reduced toward a cylindrical part and forward basically and which is continuous to a front end of the cylindrical part and a flat mounting part provided at a front end of the end wall part so as to be tightened to a flange of a master cylinder in a pair of tightening sections arranged on a virtual straight line crossing an axial line of the master cylinder orthogonally. <P>SOLUTION: A cross sectional shape of the end wall part 41 along a plane crossing a virtual straight line orthogonally and passing an axial line of the front shell half body 6 is formed into substantially straight line by connecting an outer fringe of the mounting part 42 with a front end fringe of the cylindrical part 40. A cross sectional shape of the end wall part 41 along a plane passing a virtual straight line and a straight line of the front shell half body 6 is formed in such a way that the cross sectional shape is constituted by a plurality of straight lines forming an angle mutually so as to connect the outer fringe of the mounting part 42 with the front end fringe of the cylindrical part 40. <P>COPYRIGHT: (C)2003,JPO |
