Stroke simulator

A stroke simulator for applying a reaction force to a brake operation member, the stroke simulator comprising:

• a tubular cylinder formed with a cylinder hole connected at one end side to a flow path connected to a pressurizing unit that generates fluid pressure in accordance with an operation of the brake operation member;
• a piston disposed in the cylinder hole;
• a lid member that closes an opening on the other end side of the cylinder hole;
• and
• an elastic member disposed between the piston and the lid member, wherein
• the elastic member includes a first elastic member disposed on the piston side of the cylinder hole, and a second elastic member disposed on the lid member side of the cylinder hole,
• the cylinder hole is formed with a first cylinder hole to which the piston and the first elastic member are disposed and that is formed on the flow path side, and is provided with the second elastic member and is formed on the lid member side,
• the second elastic member includes a base portion arranged in series with the first elastic member, and a protruding portion protruding out from an end face of the base portion on the piston side, and is configured such that, when the piston moves in an axial direction toward the lid member side, the base portion compresses and deforms after the protruding portion abuts against the piston and is compressed and deformed,
• the stroke simulator further comprises a retainer disposed between the first elastic member and the base portion of the second elastic member,
• the retainer includes a plate-shaped portion that has a hole formed at a position corresponding to the protruding portion and that is arranged to face an end face of the base portion on the piston side, and a guide portion projecting out from the plate-shaped portion toward the piston,
• the lid member includes a closing portion that closes the opening, and a holding portion that projects out from the closing portion toward the piston while abutting against an inner peripheral surface of the cylinder,
• the plate-shaped portion and the holding portion are separated from each other and arranged to face each other at an initial position where the brake operation member is not operated,
• the piston is a bottomed tubular member including a main body portion and an abutment portion projecting out from an outer peripheral portion of the main body portion toward the lid member side,
• a concave portion is formed in the main body portion so that the guide portion is movably inserted in the axial direction.