Operation input device

An operation input device comprising:

• an input member to which a rotational operation force is input;
• and
• a reaction force generation mechanism that generates a reaction force against the rotational operation force input to the input member, wherein
• a direction along a reference axis is defined as an axial direction, one side in the axial direction is defined as an axial first side, and another side in the axial direction is defined as an axial second side,
• the reaction force generation mechanism includes
• a tubular member disposed on the reference axis,
• a piston accommodated in the tubular member, and
• a linear motion conversion mechanism that mutually converts rotational motion of the input member and linear motion of the piston along the axial direction,
• a first elastic member that biases the piston toward the axial first side, and
• a second elastic member that biases the piston toward the axial first side and has a biasing force different from a biasing force of the first elastic member,
• a direction orthogonal to the reference axis is defined as a radial direction, a direction toward the reference axis along the radial direction is defined as a radial inside, and a direction away from the reference axis along the radial direction is defined as a radial outside,
• the reaction force generation mechanism includes
• a friction member disposed at a sliding portion between an outer peripheral surface of the piston and an inner peripheral surface of the tubular member, and
• a strained force application mechanism that presses the friction member from the radial inside toward the radial outside and applies a strained force to an inner peripheral surface of the tubular member, or presses the friction member from the radial outside toward the radial inside and applies a strained force to an outer peripheral surface of the piston,
• the friction member includes
• a sliding member disposed on a sliding surface between the tubular member and the piston, and
• a base material to which the sliding member is bonded on the radial outside or the radial inside, and
• the strained force application mechanism presses the base material on which the sliding member is disposed on the radial outside from the radial inside toward the radial outside, or presses the base material on which the sliding member is disposed on the radial inside from the radial outside toward the radial inside.

An operation input device comprising:

• an input member to which a rotational operation force is input;
• and
• a reaction force generation mechanism that generates a reaction force against the rotational operation force input to the input member, wherein
• a direction along a reference axis is defined as an axial direction, one side in the axial direction is defined as an axial first side, and another side in the axial direction is defined as an axial second side,
• the reaction force generation mechanism includes
• a tubular member disposed on the reference axis,
• a piston accommodated in the tubular member,
• a linear motion conversion mechanism configured to mutually convert rotational motion of the input member and linear motion of the piston along the axial direction,
• an elastic member that biases the piston toward the axial first side, and
• a friction member disposed at a sliding portion between an outer peripheral surface of the piston and an inner peripheral surface of the tubular member, and
• the friction member is configured to have a larger frictional force in a case where the piston moves to the axial second side than in a case where the piston moves to the axial first side.