Friction member and master cylinder comprising same

A master cylinder comprising:

• a cylinder body with a bore formed therein;
• a piston configured to move forward and backward in the bore and protrude a portion thereof from the cylinder body;
• a housing installed on the cylinder body to surround a portion of the piston protruding from the cylinder body and having a through hole formed therein such that an input rod connected to a brake pedal to press the piston is inserted;
• and
• a friction member provided between the housing and the piston to increase a frictional force with the piston when the piston moves forward and backward,
• wherein the friction member comprises:
• a body part having a hollow portion formed in a longitudinal direction;
• and
• an elastic pressing part formed on an inner circumferential surface of the body part and protruding to be in close contact with an outer circumferential surface of the piston, and
• the elastic pressing part is configured such that an inner diameter of the body part gradually decreases in a backward movement direction of the piston.

A friction member, which is provided between a piston protruding from a master cylinder and a housing surrounding the piston, comprising:

• a body part having a hollow portion formed in a longitudinal direction;
• and
• an elastic pressing part protruding toward the piston from an inner circumferential surface of the body part,
• wherein the elastic pressing part is configured such that an inner diameter of the body part gradually decreases from one side of the body part to the other side,
• wherein stoppers are configured to protrude at a regular interval along an outer circumferential surface of the other side of the body part.