Pedal simulator and vehicle brake device including the same

1 . A pedal simulator comprising:

a first damper housing;

a second damper housing coupled to the first damper housing;

a first bearing unit rotatably disposed on the second damper housing;

a damper piston unit slidably accommodated inside the first damper housing;

a damper coupled to the damper piston unit, accommodated inside the first damper housing, and compressed by a movement of the damper piston unit;

a damper pressing rod coupled to the damper piston unit to press the damper piston unit; and

a first elastic unit disposed between the damper pressing rod and the first damper housing to elastically support the damper pressing rod,

wherein the first damper housing comprises:

a damper housing body having one side to which the second damper housing is coupled, wherein the damper piston unit and the damper are disposed in the damper housing body; and

a seating portion protruding from an inner peripheral surface of the damper housing body and extending along a circumferential direction of the damper housing body, the damper piston unit being seated on the seating portion by an elastic force of the first elastic unit,

wherein the seating portion includes one or more step portions recessed in an outer surface of the seating portion.

2 . The pedal simulator according to claim 1 , wherein the step portion is disposed along a circumferential direction of the seating portion.

3 . The pedal simulator according to claim 2 , wherein the one or more step portions comprise a plurality of step portions spaced apart from one another along the circumferential direction of the seating portion.

4 . The pedal simulator according to claim 3 , wherein each of the step portions extends radially from a central portion of the seating portion.

5 . The pedal simulator according to claim 4 , wherein each of the step portions has a cross-sectional shape of either a polygon or a semicircle.

6 . The pedal simulator according to claim 1 , wherein the second damper housing comprises:

a holder body coupled to the first damper housing and to which the first bearing unit is rotatably coupled; and

a holder protrusion protruding from an outer surface of the holder body.

7 . The pedal simulator according to claim 1 , wherein the damper pressing rod comprises:

a push rod portion rotatably coupled to the damper piston unit; and

a first seating portion axially coupled to the push rod portion, the first elastic unit being seated on the first seating portion.

8 . A vehicle brake device comprising:

a housing;

a gear unit rotatably disposed in the housing and rotated by receiving a rotational force of a motor;

a motion conversion unit disposed inside the housing and coupled to the gear unit to convert a rotational motion of the gear unit into a linear motion;

a second elastic unit configured to elastically support the motion conversion unit inside the housing;

a piston unit movably coupled to the motion conversion unit;

a master cylinder coupled to one side of the housing and configured to generate hydraulic pressure in response to movement of the piston unit;

a second bearing unit disposed inside the housing to rotatably support the gear unit; and

the pedal simulator according to claim 1 , the pedal simulator being movably disposed on the other side of the housing and coupled to the motion conversion unit.

9 . The vehicle brake device according to claim 8 , wherein the motion conversion unit comprises:

a screw bolt part slidably coupled to the gear unit and rotated together with the gear unit; and

a nut part coupled to the screw bolt part and moved along the screw bolt part.

10 . The vehicle brake device according to claim 9 , wherein the piston unit is coupled to the nut part and moved together with the nut part.

11 . The vehicle brake device according to claim 9 , wherein the second elastic unit elastically supports the nut part.

12 . The vehicle brake device according to claim 11 , wherein the nut part comprises:

a nut body helically coupled to the screw bolt part;

a second seating portion protruding from an outer peripheral surface of the nut body, the second elastic unit being seated on the second seating portion; and

a rotation prevention portion formed to protrude from an outer peripheral surface of the second seating portion and configured to restrict a rotation of the nut body.

13 . The vehicle brake device according to claim 12 , wherein the rotation prevention portion comprises:

a protrusion protruding from an outer peripheral surface of the second seating portion and contacting an inner surface of the housing.

14 . The vehicle brake device according to claim 12 , wherein the screw bolt part comprises:

a bolt body axially coupled to an inner side of the gear unit, the bolt body being slidably movable and having a hollow prismatic shape; and

a screw shaft disposed on one end of the bolt body and helically coupled to the nut body, the bolt body being moved linearly along the screw shaft.