Patent ID: 9139168
Filing Date: 2015-09-22
Classification: B60T

Abstract:
1. A pedal simulator using a multi-stage series spring, comprising: a cylinder into which an operation rod connected to a brake pedal is inserted; a piston installed in the cylinder to receive a force of the operation rod; a plurality of springs installed between the cylinder and the piston to resiliently support the piston in the cylinder and disposed to overlap each other from an inner side to an outer side; and a plurality of spring seats disposed in the cylinder to overlap each other from an inner side to an outer side and configured to support the springs while being interposed between the springs, the plurality of springs including a first spring, at least one second spring, and a third spring, wherein each of the spring seats has a flange end at one end thereof, and a cup shape having a bottom surface portion at an opposite end thereof, the spring seats are selectively engaged by the piston at the flange ends of the spring seats, and the springs are disposed inside the spring seats in a multi-stage spring disposition series structure, the plurality of spring seats including an innermost spring seat and an outermost spring seat, wherein the first spring is installed between the piston and the innermost spring seat, the at least one second spring is positioned between a flange end of one of the spring seats and a bottom surface portion of another of the spring seats adjacent to the one of the spring seats, and a third springs is positioned between a flange end of the outermost spring seat and a bottom surface of the cylinder, and wherein a cushion member contacting the outmost spring seat during movement of the piston is installed at the bottom surface of the cylinder.