Pedal simulator and vehicle brake apparatus including same

Abstract

A pedal simulator and a vehicle brake apparatus including the same, including: a damper housing unit; a damper holder unit coupled to the damper housing unit; a first bearing unit rotatably disposed on the damper holder unit; a damper piston unit slidably accommodated inside the damper housing unit; a damper unit coupled to the damper piston unit, accommodated inside the damper housing unit, and compressed by movement of the damper piston unit; a damper pressing unit coupled to the damper piston unit to press the damper piston unit; and a first elastic unit disposed between the damper pressing unit and the damper housing unit to elastically support the damper pressing unit. The present disclosure has an effect of improving regenerative braking performance and increasing the amount of regenerative braking.

Description

Technical Field

[0001] Exemplary embodiments of the present disclosure relate to a pedal simulator and a vehicle brake apparatus including the same, and more particularly, to a pedal simulator capable of achieving regenerative braking and a vehicle brake apparatus including the same. Background Art

[0002] A vehicle's electronic braking system (EBS) generates braking force by using electronically controlled calipers without mechanical connections. EBSs, commonly used in electric vehicles, implement regenerative braking.

[0003] In the related art, in order to achieve regenerative braking in an electronic braking system, a separate independent chamber (such as a valve) is set to prevent the pedal force from being transmitted to the force generated by the motor, so that the difference in pedal force is eliminated in the regenerative braking section, thereby achieving structural separation.

[0004] In the case of electric vehicles, regenerative braking is generated when the accelerator pedal is released while driving. However, there is a problem in that the pedal force corresponding to regenerative braking feels significantly different in the initial stages of brake pedal application. Therefore, a solution to this problem is needed.

[0005] The background art of the present disclosure is disclosed in Korean Patent No. 10-2372394 (registered on March 11, 2022 and named “Braking apparatus for vehicle”). Utility Model Content

[0006] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a pedal simulator capable of improving regenerative braking performance and achieving pedal feel, and a vehicle brake apparatus including the pedal simulator.

[0007] Another object of the present disclosure is to provide a pedal simulator capable of improving a sense of difference in pedal depression effort during regenerative braking, and a vehicle brake apparatus including the pedal simulator.

[0008] In order to solve the above problems, the pedal simulator disclosed herein includes: a damper housing unit; a damper retainer unit coupled to the damper housing unit; a first bearing unit rotatably arranged on the damper retainer unit; a damper piston unit slidably accommodated inside the damper housing unit; a damper unit coupled to the damper piston unit, accommodated inside the damper housing unit, and compressed by the movement of the damper piston unit; a damper pressing unit coupled to the damper piston unit to press the damper piston unit; and a first elastic unit arranged between the damper pressing unit and the damper housing unit to elastically support the damper pressing unit.

[0009] The damper housing unit may include: a damper housing body, one side of which is coupled to the damper retainer unit, wherein the damper piston unit and the damper unit are arranged in the damper housing body; and a seat portion, which protrudes from the inner circumferential surface of the damper housing body and extends along the circumference of the damper housing body, and the damper piston unit is placed on the seat portion by the elastic force of the first elastic unit.

[0010] The seat portion may include one or more step portions recessed in an outer surface of the seat portion contacting the damper piston unit.

[0011] The step portions may be arranged along a circumferential direction of the seat portion.

[0012] The one or more step portions may include a plurality of step portions spaced apart from each other in a circumferential direction of the seat portion.

[0013] Each step portion may radially extend from a central portion of the seat portion.

[0014] Each of the step portions may have a polygonal or semicircular cross-sectional shape.

[0015] The damper holder unit may include: a holder body coupled to the damper housing unit, and the first bearing unit rotatably coupled to the holder body; and a holder protrusion protruding from an outer surface of the holder body.

[0016] The damper pressing unit may include a push rod portion rotatably coupled to the damper piston unit, and a first seat portion axially coupled to the push rod portion, the first elastic unit being seated on the first seat portion.

[0017] The vehicle braking device of the present invention includes: a housing unit; a gear unit, which is rotatably arranged in the housing unit and rotates by receiving the rotational force of the motor; a motion conversion unit, which is arranged inside the housing unit and coupled to the gear unit to convert the rotational motion of the gear unit into linear motion; a second elastic unit, which is configured to elastically support the motion conversion unit inside the housing unit; a piston unit, which is movably coupled to the motion conversion unit; a master cylinder unit, which is coupled to one side of the housing unit and is configured to form hydraulic pressure by insertion of the piston unit; a second bearing unit, which is arranged inside the housing unit to rotatably support the gear unit; and a pedal simulator, which is movably arranged on the other side of the housing unit and coupled to the motion conversion unit.

[0018] The motion conversion unit may include a bolt portion slidably coupled to the gear unit and rotated together with the gear unit; and a nut portion coupled to the bolt portion and moved along the bolt portion.

[0019] The piston unit may be coupled to the nut portion and move together with the nut portion.

[0020] The second elastic unit may elastically support the nut part.

[0021] The nut portion may include: a nut body which is spirally coupled to the bolt portion; a second seat portion which protrudes from an outer peripheral surface of the nut body, and the second elastic unit is seated on the second seat portion; and a rotation preventing portion which is arranged on the nut body to limit rotation of the nut body.

[0022] The rotation preventing portion may include a protrusion which protrudes from an outer peripheral surface of the second seat portion and contacts an inner surface of the housing unit.

[0023] The bolt portion may include: a bolt body axially coupled to the inner side of the gear unit, the bolt body slidably moving and having a hollow prism shape; and a screw shaft arranged on one end of the bolt body and spirally coupled to the nut body, the bolt body moving linearly along the screw axis.

[0024] The present disclosure has the effects of improving regenerative braking performance and increasing the amount of regenerative braking.

[0025] Furthermore, the present disclosure has the effect of minimizing the addition of components without increasing the layout and achieving a pedal feel.

[0026] Furthermore, the present disclosure has the effect of improving the feeling of difference in pedal depression force during regenerative braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional view showing a vehicle brake apparatus according to an embodiment of the present disclosure.

[0028] Figure 2 is a perspective view showing a motion conversion unit in a vehicle brake apparatus according to an embodiment of the present disclosure.

[0029] Figure 3 yes Figure 2 A perspective view of the motion conversion unit in FIG when viewed in another direction.

[0030] Figure 4 is a perspective view showing a pedal simulator according to an embodiment of the present disclosure.

[0031] Figure 5 yes Figure 4 Exploded perspective view and partially enlarged plan view.

[0032] Figures 6 to 8 It is along Figure 5 A cross-sectional view taken along line AA in FIG.

[0033] Figure 9 is a cross-sectional view illustrating an operating state of the vehicle brake apparatus according to the embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] Hereinafter, the pedal simulator of the present disclosure and a vehicle brake system including the same will be described with reference to the accompanying drawings. In the process, the thickness of the lines or the size of the elements shown in the drawings may be exaggerated for the purpose of clarity and ease of explanation. Furthermore, the terms described below are defined in this disclosure with regard to their functions and may vary depending on the intention or practice of the user or operator. Therefore, these terms should be defined based on the disclosure of this specification.

[0035] Figure 1 is a cross-sectional view showing a vehicle brake apparatus according to an embodiment of the present disclosure, Figure 2 is a perspective view showing a motion conversion unit in a vehicle brake apparatus according to an embodiment of the present disclosure, and Figure 3 yes Figure 2 A perspective view of the motion conversion unit in FIG when viewed in another direction.

[0036] refer to Figures 1 to 3 The vehicle brake device 1 of the embodiment of the present disclosure includes a housing unit 100, a gear unit 200, a motion conversion unit 300, a second elastic unit 400, a piston unit 500, a master cylinder unit 600, a second bearing unit 700 and a pedal simulator 800, which are described in detail as follows.

[0037] The housing unit 100 may be formed in a hollow shape having an inner space, and the motor 10 may be disposed outside the housing unit 100 .

[0038] The gear unit 200 may be rotatably disposed in the housing unit 100. The gear unit 200 may be located inside the housing unit 100, or may be disposed on one side of the housing unit 100 and rotatably coupled thereto.

[0039] The gear unit 200 may be connected to the motor 10 located on the outside of the housing unit 100 and may be rotated by receiving a rotational force of the motor 10. The gear unit 200 may be formed in a hollow shape in which a central portion is penetrated.

[0040] The motion conversion unit 300 may be installed inside the housing unit 100 and coupled to the gear unit 200 . The motion conversion unit 300 converts the rotational motion of the gear unit 200 into a linear motion, and may include a bolt portion 310 and a nut portion 320 .

[0041] As one embodiment of the motion conversion unit 300 , the bolt portion 310 may be coupled to the gear unit 200 and rotate together with the gear unit 200 , and the nut portion 320 may be coupled to the bolt portion 310 and move linearly along the bolt portion 310 .

[0042] As another embodiment of the motion conversion unit 300, the nut portion 320 may be coupled to the gear unit 200 and rotate together with the gear unit 200, and the bolt portion 310 coupled to the nut portion 320 may be linearly moved in the axial direction by the rotation of the nut portion 320. In this case, the piston unit 500 to be described below may be coupled to the linearly moving bolt portion 310.

[0043] The following describes an embodiment in which, in the motion conversion unit 300 of the vehicle brake apparatus 1 of the present disclosure, the nut portion 320 coupled to the bolt portion 310 moves linearly along the bolt portion 310 .

[0044] The bolt portion 310 may be installed inside the housing unit 100. The bolt portion 310 may be movably accommodated in the housing unit 100. The bolt portion 310 may be arranged in a longitudinal direction of the housing unit 100.

[0045] The bolt portion 310 may be slidably coupled to the gear unit 200. In addition, the bolt portion 310 may penetrate the center of the gear unit 200 to be slidably coupled thereto, and may linearly reciprocate in the longitudinal direction of the housing unit 100.

[0046] The bolt part 310 may rotate together with the gear unit 200 in the same direction as the rotation direction of the gear unit 200. The bolt part 310 may include a bolt body 311 and a screw shaft 312.

[0047] The bolt body 311 can be axially coupled to the gear unit 200 by penetrating the center of the gear unit 200, and the bolt body 311 can be slidably moved inside the gear unit 200. The bolt body 311 can be formed in a prismatic shape. In addition, the cross-section of the bolt body 311 can be formed in a polygonal shape having angled corners.

[0048] The inner diameter of the gear unit 200 may be formed to be the same as the outer diameter of the bolt body 311 so that the rotating gear unit 200 and the bolt body 311 are engaged with each other. The bolt body 311 may be formed in a hollow shape with one end opened.

[0049] A damper holder unit 820 of a pedal simulator 800 to be described below may be inserted into the bolt body 311 so that the damper holder unit 820 may be accommodated in the bolt body 311 .

[0050] The screw shaft 312 may be located at one end of the bolt body 311. The screw shaft 312 may be integrally provided with the bolt body 311. The screw shaft 312 and the bolt body 311 may be arranged on the same axis. The screw shaft 312 may be axially rotatable in the same direction as the rotation direction of the bolt body 311 rotated by the rotation of the gear unit 200.

[0051] The screw shaft 312 may have threads formed on its outer surface along its outer diameter. The nut portion 320 may be screw-coupled to the screw shaft 312 and may linearly reciprocate in the axial direction of the screw shaft 312 according to the rotation direction of the screw shaft 312.

[0052] The nut portion 320 may be coupled to the bolt portion 310 and move along the bolt portion 310. The nut portion 320 may include a nut body 321, a second seat portion 322, and a rotation preventing portion 323.

[0053] The nut body 321 may be screw-coupled to the screw shaft 312. Threads may be formed on an inner surface of the nut body 321 along an inner diameter of the nut body 321.

[0054] The second seat portion 322 may protrude from the outer circumferential surface of the nut body 321. The second seat portion 322 may be formed along the circumference of the nut body 321. The second elastic unit 400, which will be described below, may be seated on the second seat portion 322 in a state in which one side of the second elastic unit 400 contacts the outer surface of the second seat portion 322. In addition, one side of the second elastic unit 400 may be supported by the second seat portion 322.

[0055] The rotation preventing portion 323 may be provided on the second seat portion 322. The rotation preventing portion 323 may restrict rotation of the nut body 321 so that the nut body 321 moving along the screw shaft 312 does not rotate together with the screw shaft 312. The rotation preventing portion 323 may include a protrusion 323a.

[0056] The protrusion 323a may protrude from the outer peripheral surface of the second seat portion 322. A plurality of protrusions 323a may be arranged to be spaced apart from each other along the circumference of the second seat portion 322. The protrusion 323a may contact the inner surface of the housing unit 100. In addition, the housing unit 100 may include a guide portion (not shown) that guides the linear movement of the nut portion 320.

[0057] The guide portion may be recessed in the inner surface of the housing unit 100. The guide portion may be formed in the longitudinal direction of the housing unit 100. The protrusion 323a is located inside the guide portion and moves along the guide portion so that the nut body 321 may move linearly without rotating.

[0058] The second elastic unit 400 may elastically support the motion conversion unit 300 inside the housing unit 100. In addition, the second elastic unit 400 may elastically support the nut portion 320. The second elastic unit 400 may have one side in contact with the inner surface of the housing unit 100 and the other side in contact with the outer surface of the nut portion 320, and the second elastic unit 400 may provide elastic force to the bolt portion 310 coupled to the nut portion 320.

[0059] The second elastic unit 400 may be compressed by the nut part 320 that linearly moves along the screw shaft 312 , or may be compressed by the bolt part 310 that linearly slides and moves on the gear unit 200 .

[0060] The compressed second elastic unit 400 may provide elastic force (elastic restoring force) to the bolt portion 310 to return the bolt portion 310 to its original position. The second elastic unit 400 may include a coil spring surrounding the outside of the piston unit 500.

[0061] The piston unit 500 may be coupled to the nut portion 320. In addition, a rod portion of the piston unit 500 may be coupled to surround the outside of the nut body 321. The piston unit 500 may linearly move together with the nut portion 320 in cooperation with the nut portion 320.

[0062] A head portion of the piston unit 500 may be inserted into a master cylinder unit 600 provided on one side of the housing unit 100 , the master cylinder unit 600 being described below.

[0063] The master cylinder unit 600 may be coupled to one side of the housing unit 100. In another embodiment, the master cylinder unit 600 may be provided integrally with the housing unit 100. The master cylinder unit 600 may be formed in a hollow shape.

[0064] The interior of the housing unit 100 and the interior of the master cylinder unit 600 may be communicated with each other. The piston unit 500 may be inserted into the master cylinder unit 600. The master cylinder unit 600 may generate brake hydraulic pressure by pressing the piston unit 500.

[0065] The second bearing unit 700 may be installed inside the housing unit 100 to rotatably support the gear unit 200. The outer ring of the second bearing unit 700 may contact the inner surface of the housing unit 100, and the inner ring of the second bearing unit 700 may contact the outer surface of the gear unit 200.

[0066] Figure 4 is a perspective view showing a pedal simulator according to an embodiment of the present disclosure, Figure 5 yes Figure 4 exploded perspective view and partially enlarged plan view, and Figures 6 to 8 It is along Figure 5 A cross-sectional view taken along line AA in FIG.

[0067] refer to Figures 1 to 8 , the pedal simulator 800 of the embodiment of the present disclosure may be slidably disposed on the other side of the housing unit 100. The bolt portion 310 may be rotatably coupled to the pedal simulator 800.

[0068] The pedal simulator 800 may include a damper housing unit 810 , a damper holder unit 820 , a first bearing unit 830 , a damper piston unit 840 , a damper unit 850 , a damper pressing unit 860 , and a first elastic unit 870 .

[0069] The damper housing unit 810 may be slidably disposed on the housing unit 100. The damper housing unit 810 may have a hollow shape and may be formed in a shape with both sides opened.

[0070] The interior of the damper housing unit 810 may be filled with a lubricant such as grease or brake fluid.The damper housing unit 810 may include a damper housing body 811 and a seat portion 812.

[0071] One side of the damper housing body 811 ( Figure 2 The left side in the figure) is coupled to the damper retainer unit 820 to be described below, and the damper piston unit 840 and the damper unit 850 to be described below can be accommodated in the damper housing body 811.

[0072] The seat portion 812 may be provided on the other side of the damper housing body 811 and protrude from the inner circumferential surface of the damper housing body 811. The seat portion 812 may be formed along the circumference of the damper housing body 811. The seat portion 812 may be formed in a hollow shape in which a central portion is penetrated.

[0073] The damper piston unit 840 may be seated on the seat portion 812 by an elastic force (elastic restoring force) of a first elastic unit 870 to be described below.

[0074] The seat portion 812 may be provided with one or more stepped portions 812a. The stepped portions 812a may be recessed into the outer surface of the seat portion 812 so that the stepped portions 812a may contact the damper piston unit 840. By forming the stepped portions 812a in the seat portion 812, the contact area between the damper piston unit 840 and the seat portion 812 may be minimized.

[0075] The step portion 812a may be formed along the circumferential direction of the seat portion 812. In addition, the step portion 812a may be formed along the circumferential direction of the damper housing body 811.

[0076] The plurality of step portions 812a may be arranged to be spaced apart from each other in the circumferential direction of the seat portion 812. In addition, the plurality of step portions 812a may be arranged to be spaced apart from each other in the circumferential direction of the damper housing body 811.

[0077] The plurality of step portions 812a may be radially arranged based on the center portion of the seat portion 812. In addition, the step portions 812a may be radially arranged based on the center portion of the damper housing body 811.

[0078] The stepped portion 812a may be formed in a cross-sectional shape of a polygon having angled corners, such as a triangle or a square, or a rounded semicircle.

[0079] When the damper piston unit 840 is separated from the seat portion 812 by pressing a damper pressing unit 860 to be described below in a state where the damper piston unit 840 is seated on the seat portion 812, resistance occurs at the contact surface between the damper piston unit 840 and the seat portion 812 due to the viscosity and surface tension of the lubricant. Due to the viscosity and surface tension of the lubricant, a difference in feel and noise may occur during the initial operation of the pedal simulator 800.

[0080] Since the step portion 812 a is formed in the seat portion 812 , the contact area between the damper piston unit 840 and the seat portion 812 may be minimized, thereby reducing the influence of the viscosity and surface tension of the lubricant.

[0081] The damper holder unit 820 may be coupled to the damper housing unit 810. In addition, the damper holder unit 820 may be coupled to one side of the damper housing body 811. The damper holder unit 820 may rotatably support the bolt body 311. The damper holder unit 820 may include a holder body 821 and a holder protrusion 822.

[0082] The holder body 821 may be formed in a hollow shape with one end opened. The holder body 821 may be coupled to the damper housing body 811 of the damper housing unit 810 and move together with the damper housing unit 810.

[0083] The holder protrusion 822 may be provided on the holder body 821. The holder protrusion 822 may protrude from the outer surface of the holder body 821 and be formed in a hollow shape.

[0084] The retainer body 821 and the retainer protrusion 822 may be in communication. A portion of the damper unit 850 may be accommodated inside the retainer protrusion 822. The retainer protrusion 822 may have a diameter smaller than that of the retainer body 821. The retainer protrusion 822 may be inserted into the bolt body 311.

[0085] The first bearing unit 830 may be provided on the damper holder unit 820. The first bearing unit 830 may be coupled to an outer surface of the damper holder unit 820 facing the bolt portion 310. In addition, the first bearing unit 830 may be rotatably coupled to an outer surface of the holder body 821 to surround the outer circumference of the holder protrusion 822.

[0086] One end of the bolt body 311 may be seated on the first bearing unit 830. The first bearing unit 830 may rotatably support the bolt body 311. The first bearing unit 830 may support an axial load of the bolt portion 310.

[0087] The damper piston unit 840 may be slidably disposed in the damper housing unit 810. Furthermore, the damper piston unit 840 may be movably accommodated within the damper housing body 811. The damper piston unit 840 may be moved to separate from the seat portion 812 by being pressed by the damper pressing unit 860, and the damper piston unit 840 may be moved and seated on the seat portion 812 by the elastic force of the first elastic unit 870.

[0088] The damper unit 850 may be coupled to the damper piston unit 840. The damper unit 850 may be partially accommodated inside the retainer protrusion 822, and the damper unit 850 may be compressed within the retainer protrusion 822 by movement of the damper piston unit 840.

[0089] The damper unit 850 may be manufactured to include an elastically deformable material. The damper unit 850 may include rubber, silicone, plastic, etc. as the elastically deformable material.

[0090] The damper pressing unit 860 may be coupled to the damper piston unit 840 to press the damper piston unit 840. The damper pressing unit 860 may include a push rod portion 861 and a first seat portion 862.

[0091] The push rod portion 861 may be rotatably coupled to an outer surface of the damper piston unit 840 in a joint manner. In addition, the push rod portion 861 may be caulked to the damper piston unit 840.

[0092] The first seat portion 862 is axially coupled to the push rod portion 861. In addition, the push rod portion 861 may be coupled to the first seat portion 862 by penetrating the center of the first seat portion 862. The first elastic unit 870 may be seated on the first seat portion 862.

[0093] The first elastic unit 870 may be installed between the damper pressing unit 860 and the damper housing unit 810 to elastically support the damper pressing unit 860. One side of the first elastic unit 870 may be in contact with the outer surface of the first seat portion 862, and the other side of the first elastic unit 870 may be in contact with the other side of the damper housing unit 810, and the first elastic unit 870 may provide elastic force to the damper pressing unit 860 that moves due to external force applied to the damper pressing unit 860.

[0094] The first elastic unit 870 may be compressed by the first seat portion 862 moved by the external force applied to the damper pressing unit 860. The compressed first elastic unit 870 may provide elastic force (elastic restoring force) to the first seat portion 862 to return the first seat portion 862 to its initial position. The first elastic unit 870 may be a coil spring surrounding the outside of the push rod portion 861.

[0095] The operation process of the vehicle brake apparatus of the embodiment of the present disclosure having the above-described configuration is as follows.

[0096] Figure 9 is a cross-sectional view illustrating an operating state of the vehicle brake apparatus according to the embodiment of the present disclosure.

[0097] refer to Figure 9 In the deceleration section of the vehicle, the pedal simulator 800 becomes immobile due to the elastic force of the second elastic unit 400 and the hydraulic reaction force. In this case, the damper unit 850 may be compressed by pressing the damper pressing unit 860.

[0098] When the motor 10 is operated by a brake signal from a vehicle control unit (not shown) generated when a user steps on a pedal and rotates the gear unit 200 , the gear unit 200 rotates the bolt body 311 .

[0099] By rotating the bolt body 311, the nut portion 320 moves along the screw shaft 312 (based on Figure 9 The second elastic unit 400 is compressed by the movement of the nut portion 320, and the brake hydraulic pressure is formed in the master cylinder unit 600 by the piston unit 500 coupled to the nut body 321.

[0100] Due to the movement of the nut part 320 and the elastic force of the compressed second elastic unit 400 , the hydraulic reaction force applied to the bolt part 310 by the piston unit 500 does not move the bolt part 310 , so that the position of the bolt part 310 is fixed.

[0101] The position of the bolt portion 310 is fixed, so that the position of the pedal simulator 800 is also fixed. In addition, the damper housing unit 810 becomes immovable due to the elastic force of the second elastic unit 400 and the hydraulic reaction force.

[0102] When the damper pressing unit 860 is pressed by an external force, the damper pressing unit 860 moves toward the damper holder unit 820. When the damper pressing unit 860 moves, the first elastic unit 870 is compressed and deformed by pressing the first seat portion 862.

[0103] When external force is applied to the damper pressing unit 860 and the push rod portion 861 presses the damper piston unit 840 seated on the seat portion 812, the damper piston unit 840 moves the damper holder unit 820 inward to compress the damper unit 850. In this case, the user can feel an initial braking feeling.

[0104] The pedal simulator 800 of the embodiment of the present disclosure and the vehicle brake apparatus 1 including the pedal simulator 800 can improve regenerative braking performance and increase the regenerative braking amount.

[0105] The pedal simulator 800 of the embodiment of the present disclosure and the vehicle brake apparatus 1 including the pedal simulator 800 can minimize the increase in components and achieve pedal feeling without increasing the layout.

[0106] The pedal simulator 800 of the embodiment of the present disclosure and the vehicle brake apparatus 1 including the pedal simulator 800 can improve the feeling of difference in pedal depression force during regenerative braking.

[0107] Although the present disclosure has been described with reference to the embodiments shown in the drawings, the embodiments of the present disclosure are for illustrative purposes only, and those skilled in the art will appreciate that various modifications and other equivalent embodiments are possible based on the embodiments.

Claims

1. A pedal simulator, characterized in that include: Damper housing unit; a damper retainer unit coupled to the damper housing unit; a first bearing unit rotatably arranged on the damper holder unit; a damper piston unit slidably accommodated inside the damper housing unit; a damper unit coupled to the damper piston unit, accommodated inside the damper housing unit, and compressed by movement of the damper piston unit; a damper pressing unit coupled to the damper piston unit to press the damper piston unit; as well as A first elastic unit is disposed between the damper pressing unit and the damper housing unit to elastically support the damper pressing unit.

2. The pedal simulator according to claim 1, characterized in that The damper housing unit comprises: a damper housing body having one side coupled to the damper retainer unit, wherein the damper piston unit and the damper unit are arranged in the damper housing body; and A seat portion protrudes from an inner circumferential surface of the damper housing body and extends in a circumferential direction of the damper housing body, the damper piston unit being seated on the seat portion by an elastic force of the first elastic unit.

3. The pedal simulator according to claim 2, characterized in that The seat portion includes one or more step portions recessed into an outer surface of the seat portion contacting the damper piston unit.

4. The pedal simulator according to claim 3, characterized in that The step portions are arranged along a circumferential direction of the seat portion.

5. The pedal simulator according to claim 4, characterized in that The one or more step portions include a plurality of step portions spaced apart from each other along a circumferential direction of the seat portion.

6. The pedal simulator according to claim 5, characterized in that Each of the step portions radially extends from a central portion of the seat portion.

7. The pedal simulator according to claim 6, characterized in that Each of the step portions has a polygonal or semicircular cross-sectional shape.

8. The pedal simulator according to claim 1, wherein The damper holder unit comprises: a holder body coupled to the damper housing unit, and the first bearing unit is rotatably coupled to the holder body; and A retainer protrusion protrudes from an outer surface of the retainer body.

9. The pedal simulator according to claim 1, wherein The damper pressing unit includes: a push rod portion rotatably coupled to the damper piston unit; and A first seat portion is axially coupled to the push rod portion, and the first elastic unit is seated on the first seat portion.

10. A vehicle braking device, characterized in that: include: Shell element; a gear unit rotatably disposed in the housing unit and rotated by receiving a rotational force of the motor; a motion conversion unit disposed inside the housing unit 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 unit; a piston unit movably coupled to the motion conversion unit; a master cylinder unit coupled to one side of the housing unit and configured to form hydraulic pressure by insertion of the piston unit; a second bearing unit disposed inside the housing unit to rotatably support the gear unit; as well as The pedal simulator according to any one of claims 1 to 9, which is movably arranged on the other side of the housing unit and coupled to the motion conversion unit.

11. The vehicle brake system according to claim 10, characterized in that The motion conversion unit includes: a bolt portion slidably coupled to the gear unit and rotating together with the gear unit; and A nut portion is coupled to the bolt portion and moves along the bolt portion.

12. The vehicle brake system according to claim 11, characterized in that The piston unit is coupled to the nut portion and moves together with the nut portion.

13. The vehicle brake system according to claim 11, wherein: The second elastic unit elastically supports the nut part.

14. The vehicle brake system according to claim 13, wherein: The nut portion includes: a nut body threadably coupled to the bolt portion; a second seat portion protruding from an outer peripheral surface of the nut body, the second elastic unit being seated on the second seat portion; and A rotation preventing portion is disposed on the nut body to restrict rotation of the nut body.

15. The vehicle brake system according to claim 14, characterized in that The rotation preventing portion comprises: A protrusion protrudes from an outer peripheral surface of the second seat portion and contacts an inner surface of the housing unit.

16. The vehicle brake system according to claim 14, wherein: The bolt portion includes: a bolt body axially coupled to an inner side of the gear unit, the bolt body being slidably movable and having a hollow prism shape; and A screw shaft is disposed on one end of the bolt body and is screw-coupled to the nut body, and the bolt body moves linearly along the screw axis.

Images