Cylinder device and vehicle brake system

摘要

A cylinder device includes a regulation mechanism that regulates separation distance between a front piston and a rear piston. A spring seat member of the regulation mechanism includes a spring reception part that projects toward a retainer side to receive a rear end of a spring, a cup seal holding part that projects on an opposite side from the retainer to hold a cup seal arranged on the rear piston, and a projection part that projects on the opposite side from the retainer. The projection part becomes abuttable on the retainer by a stroke of the rear piston if the spring reception part and the cup seal holding part are installed reversely-oriented on the rear piston.

主权项

1. A cylinder device comprising:
a front piston that is arranged on a front side at a bottom side of a bottomed cylinder hole; a rear piston that is arranged on a rear side of the cylinder hole; and a regulation mechanism that is arranged between the front piston and the rear piston to regulate separation distance between the front piston and the rear piston, wherein the regulation mechanism includes a retainer that is attached to the front piston, a bolt that has its head engaged with the retainer and is screwed in a screw hole formed in the rear piston, a spring seat member that is installed on the rear piston, and a spring that is compressively arranged between the retainer and the spring seat member, the spring seat member includes a spring reception part that projects toward the retainer to receive a rear end of the spring, a cup seal holding part that projects to an opposite side from the retainer of the spring reception part to hold a cup seal arranged on the rear piston, and a projection part that projects toward the opposite side from the retainer, and the projection part becomes abuttable on the retainer by a stroke of the rear piston if the spring reception part and the cup seal holding part are installed reversely-oriented on the rear piston.