Brake device for a vehicle

Abstract

Braking device for a vehicle, comprising: a drive component; a gear part designed to rotate by receiving power from the drive part; a housing part that is provided with a gearbox housing designed to accommodate the gearbox part; a motion conversion part which is arranged in the housing part, coupled to the gear part and is designed to convert a rotary motion of the gear part into a linear motion; a piston part designed to generate hydraulic brake pressure in a master cylinder part by means of a linear movement of the motion conversion part; a pedal simulator coupled to the housing part on a side opposite the main cylinder part; and a control housing in which a circuit board is embedded and which is positioned closer to a driver than the drive unit.

Description

BACKGROUND

[0001] The present disclosure relates to a braking device for a vehicle and in particular to a braking device for a vehicle that is capable of implementing regenerative braking. DESCRIPTION OF THE RELATED STATE OF THE ART

[0002] An electric braking system for a vehicle is a braking system that generates braking force using an electric brake caliper, which is electronically controlled without a mechanical connection. Generally, an electric braking system used in an electric vehicle implements regenerative braking.

[0003] To implement regenerative braking in the electric braking system according to the state of the art, a separate independent chamber, such as a valve, is provided to structurally separate the electric braking system so that a pedal force is not transferred to the force generated by the motor in order to eliminate a non-uniformity of pedal force in a regenerative braking section.

[0004] The background technology of the present disclosure is disclosed in Korean patent no. 10-2372394 (published on March 11, 2022, entitled “Brake Apparatus for Vehicle”; “Brake device for a vehicle”). SUMMARY

[0005] One objective of the present disclosure is to provide a braking device for a vehicle in which a gearbox housing and a control housing can be formed in one piece.

[0006] Another objective of the present disclosure is to provide a braking device for a vehicle in which an area in which a magnet is installed and an area in which a position sensor is installed can be separated, thereby suppressing the ingress of grease, foreign substances or the like.

[0007] Another objective of the present disclosure is to provide a braking device for a vehicle which is able to prevent an adhesive from flowing back when a magnet is connected to a magnetic mounting part by gluing.

[0008] A braking device for a vehicle according to one aspect of the present disclosure may comprise: a drive part; a transmission part configured to rotate by receiving power from the drive part; a housing part provided with a transmission housing configured to receive the transmission part; a motion conversion part arranged in the housing part, coupled to the transmission part and configured to convert a rotary motion of the transmission part into a linear motion; a piston part configured to generate hydraulic brake pressure in a master cylinder part by means of a linear motion of the motion conversion part; a pedal simulator coupled to the housing part on a side opposite the master cylinder part; and a control housing in which a circuit board is embedded and which is arranged to be closer to a driver than the drive part.

[0009] The braking device may further comprise: a magnetic part coupled to a drive shaft of the drive part, wherein the circuit board includes a position sensor which is provided to face the magnetic part, and wherein the control housing includes a partition which is arranged between the magnetic part and the position sensor and is made of a non-magnetic material.

[0010] The magnetic part may include: a holder coupled to the drive shaft and made of a non-magnetic material; and a magnet mounted on the holder and positioned so that it faces the position sensor.

[0011] The holder may comprise: a holder main body coupled to the drive shaft and the gearbox part; and a magnet mounting part connected to the holder main body and configured so that the magnet is mounted on the magnet mounting part.

[0012] A cross-section of an outer surface of the magnet mounting part may have a non-circular shape.

[0013] The outer surface of the magnetic mounting part can include a curved surface section and a non-curved surface section.

[0014] The magnet mounting part may include a magnet mounting groove section on which the magnet is mounted, wherein the magnet mounting groove section may include: a mounting groove side wall configured to surround the magnet; and a mounting groove bottom surface configured to support the magnet, and wherein an enlarged diameter section with an enlarged inner diameter may be provided at a connecting section between the mounting groove side wall and the mounting groove bottom surface.

[0015] The inner diameter of the section with the enlarged diameter can increase towards the mounting groove bottom surface.

[0016] According to the present disclosure, the gearbox housing and the control housing can be formed in one piece, thereby reducing manufacturing costs.

[0017] According to the present disclosure, the area in which the magnet is installed and the area in which the position sensor is installed can be separated by the partition, so that it can be prevented that grease, foreign substances or the like enter the position sensor, thereby improving the measurement accuracy of the position sensor.

[0018] According to the present disclosure, it is possible to prevent the adhesive from flowing back when the magnet is connected to the magnet mounting part by gluing, thereby improving the measurement accuracy of the position sensor and reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a cross-sectional view representing a braking device for a vehicle according to an embodiment of the present disclosure. Fig. Figure 2 is a view showing a gearbox housing and a side of a control housing according to the embodiment of the present disclosure. Fig. Figure 3 is a view showing the gearbox housing and the other side of the control housing according to the embodiment of the present disclosure. Fig. Figure 4 is a perspective view showing the gearbox housing and one side of the control housing according to the embodiment of the present disclosure. Fig. Figure 5 is a cross-sectional view showing the gearbox housing and the control housing according to the embodiment of the present disclosure. Fig. Figure 6 is an enlarged view of part A in Fig. 5. Fig. Figure 7 is a perspective exploded view showing a drive part and a control according to the embodiment of the present disclosure. Fig. Figure 8 is a cross-sectional view showing a state in which a drive part connection and a control connection are coupled according to the embodiment of the present disclosure. Fig. Figure 9 is a view showing a gear part and a magnet part according to the embodiment of the present disclosure. Fig. Figure 10 is a cross-sectional view showing a holder according to the embodiment of the present disclosure. Fig. Figure 11 is a view representing a state in which a magnet is mounted on the holder according to the embodiment of the present disclosure. DETAILED DESCRIPTION

[0019] A braking device for a vehicle according to the present disclosure is described below by reference to the accompanying drawings, using various exemplary embodiments. For the sake of clarity and expediency, the thickness of lines shown in the drawings, the sizes of components, or the like may be exaggerated. Furthermore, the terms used below are defined in light of their functions in the present disclosure and may vary depending on the intention of a user or operator, or on common practice. Therefore, the definitions of these terms should be based on the entire content of the present description.

[0020] Fig. Figure 1 is a cross-sectional view representing a braking device for a vehicle according to an embodiment of the present disclosure, Fig. Figure 2 is a view showing a gearbox housing and a side of a control housing according to the embodiment of the present disclosure, Fig. Figure 3 is a view showing the gearbox housing and the other side of the control housing according to the embodiment of the present disclosure, Fig. Figure 4 is a perspective view showing the gearbox housing and one side of the control housing according to the embodiment of the present disclosure. Fig. Figure 5 is a cross-sectional view showing the gearbox housing and the control housing according to the embodiment of the present disclosure, Fig. Figure 6 is an enlarged view of part A in Fig. 5, Fig. Figure 7 is a perspective exploded view showing a drive part and a control unit according to the embodiment of the present disclosure, Fig. Figure 8 is a cross-sectional view showing a state in which a drive component connection and a control connection are coupled according to the embodiment of the present disclosure. Fig. Figure 9 is a view showing a gear part and a magnet part according to the embodiment of the present disclosure, Fig. Figure 10 is a cross-sectional view representing a holder according to the embodiment of the present disclosure, and Fig. Figure 11 is a view representing a state in which a magnet is mounted on the holder according to the embodiment of the present disclosure.

[0021] With reference to Fig. According to one embodiment of the present disclosure, a braking device for a vehicle, as described in Figures 1 to 11, can comprise a drive part 10, a control unit 20, a housing part 100, a transmission part 200, a motion conversion part 400, a piston part 500, a master cylinder part 600, and a pedal simulator 700. In some embodiments, the drive part 10 can be referred to as a drive assembly. In some embodiments, the housing part 100 can be referred to as a housing. In some embodiments, the transmission part 200, the motion conversion part 400, the piston part 500, and the master cylinder part 600 can be referred to as a transmission assembly, a motion conversion assembly, a piston assembly, and a master cylinder assembly, respectively.

[0022] The drive unit 10 comprises a motor and generates power. The power generated by the drive unit 10 is transmitted to the transmission unit 200. The drive unit 10 includes a drive shaft 11, and the drive shaft 11 is operatively connected to a first gear 210 via a holder 910. The drive unit 10 can include one or more drive unit terminals 40, which are electrically connected to one or more control terminal units 30.

[0023] A space is provided in the housing part 100, and the components, such as the piston part 500 and the gear part 200, are arranged in this space. The drive part 10, including the motor, can be coupled to the housing part 100. The housing part 100 can include a gear housing 110, which is configured to accommodate the gear part 200.

[0024] The gear unit 200 is rotatably arranged within the housing unit 100. The gear unit 200 can be positioned inside the housing unit 100. Alternatively, the gear unit 200 can be arranged on one side of the housing unit 100 and rotatably coupled to the housing unit 100.

[0025] The gear section 200 rotates by receiving power from the drive section 10. The gear section 200 can comprise the first gear 210, which is connected to the drive shaft 11 of the drive section 10, a second gear 220, which is configured to mesh with the first gear 210, and a third gear 230, which is configured to mesh with the second gear 220. The third gear 230 can be formed in a hollow shape through which a central section is penetrated. The first gear 210, the second gear 220, and the third gear 230 are housed in the gear housing 110. A pedal guard 790 can be mounted on the gear housing 110.

[0026] A bearing element can be installed in the housing element 100 and support the gear element 200 so that the gear element 200 is rotatable. An outer ring of the bearing element can abut an inner surface of the gear housing 110, and an inner ring of the bearing element can abut an outer surface of the third gear 230.

[0027] The control unit 20 can include an electronic control unit (ECU). The control unit 20 comprises a printed circuit board (PCB) 27 and a control housing 21 in which the PCB 27 is embedded. The control housing 21 can be formed integrally with the gearbox housing 110, thereby reducing manufacturing costs.

[0028] The control housing 21 can comprise a first housing surface 25 and a second housing surface 26. The first housing surface 25 can face the engine compartment of a vehicle, and the second housing surface 26 can face the driver, i.e., the driver's seat. The control unit 20 can be positioned closer to the driver than the drive unit 10. Because the control unit 20 is positioned further away from the engine compartment than the drive unit 10, as described above, a sufficient clearance between the engine and the braking device of a vehicle can be ensured, thereby reducing the risk of injury to the driver in the event of an accident, such as a vehicle collision.

[0029] The printed circuit board 27 is arranged in an interior space between the first housing surface 25 and the second housing surface 26. Since the first housing surface 25 and the second housing surface 26 surround the printed circuit board 27, it is possible to prevent foreign substances from entering the printed circuit board 27. The first housing surface 25 and the second housing surface 26 can be provided separately and coupled to each other by screws or the like.

[0030] The first housing surface 25 can include a mounting groove section 22 and a housing sealing groove section 23. The mounting groove section 22 can be concave on a side opposite the gear part 200. A portion of a magnetic part 900 coupled to the first gear 210, e.g., a magnet 920, can be received in the mounting groove section 22. In some embodiments, the magnetic part 900 can be referred to as a magnetic assembly.

[0031] The housing sealing groove section 23 is designed to surround the mounting groove section 22 and the control connection part 30. Therefore, a sealing element 120 mounted on the housing sealing groove section 23 can prevent foreign matter from entering the first gear 210 and the control connection part 30. In some embodiments, the sealing element 120 and the control connection part 30 can be referred to as a sealing assembly and a control connection assembly, respectively.

[0032] The sealing element 120 can be formed in an approximate "8" shape and include one or more sealing projections 121 that extend towards the first housing surface 25 and the second housing surface 26. The sealing element 120 can comprise an elastically deformable material. For example, the sealing element 120 can comprise a rubber material.

[0033] The control unit 20 can include the control connection part 30, which is electrically connected to the drive unit connection 40. The control connection part 30 can include a connection housing 31 and a control terminal 32.

[0034] Since the control terminal 32 is electrically connected to the drive terminal 40, the control unit 20 can control the operation of the drive unit 10. Because the terminal housing 31 is made of an insulating material, it is possible to prevent electricity from escaping to the outside when the control terminal 32 and the drive terminal 40 are electrically connected.

[0035] The control terminal 32 can be provided as a pair of control terminals 32. Contact projections 32a can be provided on surfaces of the pair of control terminals 32 that face each other. The contact projection 32a is designed to project further than the other sections of the control terminal 32. The drive component terminal 40 can be inserted between the pair of control terminals 32 and fitted into the control terminals 32, forming a stable electrical connection while being pressed by the pair of contact projections 32a.

[0036] The terminal housing 31 is designed to surround the control terminal 32. The connection section between the control terminal 32 and the drive terminal 40 is separated from the outside by the terminal housing 31. Therefore, the terminal housing 31 prevents grease, foreign matter, or the like from entering the connection section between the control terminal 32 and the drive terminal 40 when the gear unit 200, including the first gear 210, rotates. This prevents the leakage of electrical current and the occurrence of a fire.

[0037] The transmission housing 110 can comprise a first transmission housing surface 115 and a second transmission housing surface 116. The first transmission housing surface 115 can face the engine compartment of the vehicle, and the second transmission housing surface 116 can face the driver, i.e., the driver's seat. The first transmission housing surface 115 can be formed integrally with the first housing surface 25 to define the same surface. In the present embodiment, the first transmission housing surface 115 is shown as coplanar with the first housing surface 25. However, the first transmission housing surface 115 and the first housing surface 25 need not be arranged on the same plane, as long as the first transmission housing surface 115 and the first housing surface 25 are formed integrally.

[0038] The first gear housing surface 115 can include one or more gear receiving sections. The gear receiving sections can include a second gear receiving section 112, configured to receive the second gear 220, and a third gear receiving section 113, configured to receive the third gear 230. The first gear housing surface 115 can include a gear housing sealing groove section 111. The gear housing sealing groove section 111 is configured to surround the second gear receiving section 112 and the third gear receiving section 113. Therefore, the sealing element 120, which is installed in the gear housing sealing groove section 111, can prevent moisture, foreign matter, or the like from entering the second gear 220 and the third gear 230.

[0039] The housing sealing groove section 23 and the gearbox housing sealing groove section 111 can be continuously connected. The first housing surface 25 and the first gearbox housing surface 115 can be formed in one piece, and the housing sealing groove section 23 and the gearbox housing sealing groove section 111 can be continuous. The sealing element 120 can be mounted in the housing sealing groove section 23 and the gearbox housing sealing groove section 111, thereby preventing external moisture, foreign matter, or the like from entering an internal area of ​​the sealing element 120 and preventing grease or the like from escaping to the outside from the internal area.

[0040] The braking device for a vehicle according to the embodiment of the present disclosure can comprise the magnetic part 900 and a position sensor 28. The magnetic part 900 can be coupled to the drive shaft 11 of the drive part 10, and the circuit board 27 can include the position sensor 28. The position sensor 28 can be mounted on the circuit board 27 at a position facing the magnetic part 900. The position sensor 28 can detect a position of the drive part 10, e.g., an angular position, a rotational displacement, and the like, by means of the magnetic part 900 coupled to the drive shaft 11, and control a braking operation of the braking device for a vehicle.

[0041] The magnetic part 900 can comprise the holder 910 and the magnet 920. The holder 910 can comprise a holder main body 911 and a magnet mounting part 912. In some embodiments, the magnet mounting part 912 can be referred to as a magnet mounting assembly. The holder main body 911 is formed in the form of a hollow column and has an inner surface coupled to the drive shaft 11 and an outer surface coupled to the first gear 210. The magnet mounting part 912 is connected to one end of the holder main body 911 and has an inner diameter larger than the inner diameter of the holder main body 911. The magnet 920 is mounted on the magnet mounting part 912, facing the position sensor 28. The holder 910 can comprise a non-magnetic material. The first gear 210 can comprise a non-magnetic material, e.g., plastic.

[0042] A cross-section of an outer surface of the magnetic mounting part 912 may have a non-circular shape. A non-circular shape refers to a shape that is not perfectly circular and includes shapes such as elliptical and polygonal. The outer surface of the magnetic mounting part 912 may include a curved surface section 912a and a non-curved surface section 912b. The non-curved surface section 912b may be a flat surface section and may be implemented by D-cut machining or the like. Because the magnetic mounting part 912 is formed in a non-circular shape, it can be held and rotated without slipping during a process of checking the performance of the drive part 10 on a production line or the like.Therefore, performance can be managed by checking the performance of the drive part 10, thereby improving quality.

[0043] The magnet mounting part 912 can include a magnet mounting groove section 913 in which the magnet 920 is mounted. The magnet mounting groove section 913 can include a mounting groove side wall 913a configured to surround the magnet 920 and a mounting groove bottom surface 913b configured to support the magnet 920. When the magnet 920 is inserted into the magnet mounting groove section 913, a side surface of the magnet 920 is fitted with the mounting groove side wall 913a, and a bottom surface of the magnet 920 is in contact with and supported on the mounting groove bottom surface 913b.

[0044] The magnet 920 can be inserted into the magnet mounting slot section 913 and then coupled to the magnet mounting slot section 913 by adhesive bonding. If the magnet 920 is inserted into the magnet mounting slot section 913 in a state in which an adhesive is applied to at least one part of the magnet 920 or the magnet mounting slot section 913, the adhesive can flow back between the magnet 920 and the magnet mounting slot section 913.

[0045] In the present embodiment, a section with an enlarged diameter 914 is provided at a connecting section between the mounting groove side wall 913a and the mounting groove bottom surface 913b, thus ensuring a space in which the adhesive can be contained. Since the adhesive, which is moved towards the mounting groove bottom surface 913b during the insertion of the magnet 920 into the magnet mounting groove section 913, is contained in the section with the enlarged diameter 914, the adhesive does not flow back to the outside of the magnet mounting groove section 913. Therefore, it is possible to improve the measuring accuracy of the position sensor 28 and prevent a deterioration in the performance of the drive part 10. In addition, a process for checking whether the adhesive is flowing back can be eliminated from the production line or the like, thereby reducing manufacturing costs.The section with the enlarged diameter 914 is defined as a section with a larger inner diameter of the mounting groove side wall 913a than the other sections. The inner diameter of the section with the enlarged diameter 914 can gradually increase towards the mounting groove bottom surface 913b. Therefore, the adhesive being forced towards the mounting groove bottom surface 913b can be easily absorbed, and it is possible to suppress backflow or minimize the amount of backflow.

[0046] The first housing surface 25 can comprise a partition 25a and a circumferential wall 25b. The partition 25a can be a section of the first housing surface 25 facing the magnet 920. The circumferential wall 25b can be defined as the remaining section of the first housing surface 25 that excludes the partition 25a.

[0047] Since the partition 25a is located between the magnet 920 and the position sensor 28, the area where the magnet 920 is installed and the area where the position sensor 28 is installed are separated by the partition 25a. Therefore, it is possible to prevent grease supplied to the gear part 200 or the like, or other foreign substances, from entering the area where the position sensor 28 is installed, thereby improving the measurement accuracy of the position sensor 28 and preventing the occurrence of a fire or similar incident. The partition 25a can be made of a non-magnetic material, such as plastic. Because the partition 25a is made of a non-magnetic material, the leakage of magnetic flux can be suppressed, allowing the position sensor 28 to accurately measure the position of the magnet 920.

[0048] The circumferential wall 25b can be connected to an outer circumference of the partition 25a and surround the partition 25a. The circumferential wall 25b can be formed integrally with the partition 25a. The circumferential wall 25b can be thicker than the partition 25a. The circumferential wall 25b is designed to have a predetermined thickness or greater, increasing the rigidity of the control housing 21 and protecting the printed circuit board 27, which is arranged in the control housing 21, from external impacts or the like. The partition 25a is designed to be thinner than the circumferential wall 25b, improving the measuring accuracy of the position sensor 28 and preventing grease or foreign substances from entering the position sensor 28.

[0049] A bottom surface of the mounting groove section 22 can define the partition 25a, and an upper end (left end based on Fig. 6) The mounting groove section 22 can be connected to the circumferential wall 25b. The magnet 920 can be inserted and positioned in the mounting groove section 22. The entire magnet 920 can be positioned within the mounting groove section 22. The magnet 920 can be surrounded by the mounting groove section 22, thereby reducing the leakage of magnetic flux from the magnet 920. An axle of the drive shaft 11 is positioned on the bottom surface of the mounting groove section 22.

[0050] The partition 25a, which forms the bottom surface of the mounting slot section 22, can be positioned closer to the circuit board 27 than the circumferential wall 25b. The distance between the magnet 920 and the position sensor 28 can be reduced because the magnet 920 is positioned within the mounting slot section 22, further improving the measurement accuracy of the position sensor 28. The magnet mounting part 912 can be positioned closer to the circuit board 27 than the first gear 210.

[0051] The motion conversion part 400 can be arranged in the housing part 100 and coupled to the gear part 200. The motion conversion part 400 can serve to convert a rotary motion of the gear part 200 into a linear motion and may comprise a bolt part 410 and a nut part 420. In some embodiments, the bolt part 410 and the nut part 420 may be referred to as a bolt assembly and a nut assembly, respectively.

[0052] In one embodiment of the motion conversion part 400, the screw bolt part 410 can be coupled to the gear part 200 and rotate together with the gear part 200, and the screw nut part 420 can be coupled to the screw bolt part 410 and move in a straight line along the screw bolt part 410.

[0053] In another embodiment of the motion conversion part 400, the screw nut part 420 can be coupled to the gear part 200 and rotate together with the gear part 200, and the screw bolt part 410, which is coupled to the screw nut part 420, can be moved linearly in an axial direction by the rotation of the screw nut part 420. In this case, the piston part 500 can be coupled to the screw bolt part 410, which is configured to move linearly.

[0054] Below is a description of an embodiment of the motion conversion part 400 in which the screw nut part 420, which is coupled to the screw bolt part 410, moves in a straight line along the screw bolt part 410.

[0055] An outer surface of the screw bolt part 410 engages with an inner surface of the third gear 230. The outer surface of the screw bolt part 410 is formed in the form of a polygonal column, and the inner surface of the third gear 230 is formed in the form of a polygonal groove, so that a torque generated when the third gear 230 rotates is transmitted to the screw bolt part 410 without obstruction. If the third gear 230 does not rotate, for example, if the third gear 230 does not rotate due to a failure of the drive part 10, the screw bolt part 410 can slide relative to the third gear 230.

[0056] The nut part 420 can be coupled to the bolt part 410. One side of the bolt part 410 can engage with the third gear 230, and the other side of the bolt part 410 can engage with the nut part 420. Because the nut part 420 is screwed to the bolt part 410, the nut part 420 moves in a straight line on the bolt part 410 when the bolt part 410 rotates in conjunction with the rotation of the third gear 230. If the third gear 230 does not rotate, for example, if the third gear 230 does not rotate due to a failure of the drive part 10, the bolt part 410 slides relative to the third gear 230, so that the nut part 420 can also move in the same direction.

[0057] The screw bolt part 410 is installed in the housing part 100. The screw bolt part 410 is movably mounted in the housing part 100. The screw bolt part 410 can be arranged in a longitudinal direction of the housing part 100.

[0058] The screw bolt part 410 can be slidably coupled to the gear part 200. More precisely, the screw bolt part 410 can penetrate a central section of the third gear 230 and be in surface contact with the interior of the third gear 230, so that the screw bolt part 410 can move back and forth in a straight line in the longitudinal direction of the housing part 100 and can rotate in the same direction as the third gear 230 when the third gear 230 rotates.

[0059] The screw bolt part 410 can comprise a bolt body section 411 and a screw shaft 412.

[0060] The bolt body section 411 can penetrate the central section of the third gear 230 and be coupled to the third gear 230, and the bolt body section 411 can slide within the third gear 230. The bolt body section 411 can be formed in a prismatic shape. More precisely, an edge of a cross-section of the bolt body section 411 can be formed in an angled polygonal shape.

[0061] The inner surface of the third gear 230 can be configured to have the same shape as an outer surface of the bolt body section 411, so that the third gear 230 and the rotating bolt body section 411 mesh with each other. One end (right side based on Fig. 1) The bolt body section 411 can be formed in an open, hollow column shape with an empty space.

[0062] A damper holder 720 of the pedal simulator 700 can be inserted into the bolt body section 411, and the damper holder 720 can be received in the bolt body section 411.

[0063] The screw shaft 412 is at one end (left side based on Fig. 1) of the bolt body section 411. The screw shaft 412 can be integrated with the bolt body section 411. The screw shaft 412 and the bolt body section 411 can be arranged on the same axis.

[0064] The screw shaft 412 rotates axially in a direction identical to the direction of rotation of the bolt body section 411, which is rotated by the rotation of the gear part 200. A screw thread can be formed on an outer surface of the screw shaft 412 and arranged along an outer diameter of the screw shaft 412. The nut part 420 is screwed to the screw shaft 412, and the nut part 420 moves back and forth in a straight line in the axial direction of the screw shaft 412 in the direction of rotation of the screw shaft 412.

[0065] The nut part 420 is coupled to the bolt part 410 and moves along the bolt part 410. The nut part 420 can comprise a nut body section 421, a nut seat section 422, and an anti-rotation section (not shown). The nut body section 421 can be screwed to the screw shaft 412. A screw thread can be formed on an inner surface of the nut body section 421 along its inner surface. The nut seat section 422 can project from an outer circumferential edge of the nut body section 421. The nut seat section 422 can be formed in a circumferential direction of the nut body section 421. A return spring part 430 is in a state in which one side (right side based on Fig. 1) The return spring part 430 adjoins an outer surface of the nut seat section 422. More precisely, one side of the return spring part 430 is supported by the nut seat section 422. One or more anti-rotation sections can project outwards from the outer surface of the nut seat section 422 and restrict rotation of the nut body section 421, so that the nut body section 421, which moves along the screw shaft 412, does not rotate together with the screw shaft 412. The anti-rotation section can adjoin an inner surface of the housing part 100. More precisely, the housing part 100 can be provided with a guide section designed to guide the linear movement of the screw nut part 420.The anti-rotation section is positioned on the guide part, and the anti-rotation section moves along the guide part so that the mother body section 421 can move in a straight line without rotating.

[0066] The braking device for a vehicle according to the embodiment of the present disclosure can include the return spring part 430. The return spring part 430 elastically supports the motion conversion part 400 in the housing part 100. More precisely, the return spring part 430 can elastically support the screw nut part 420. One side (left side based on Fig. 1) The return spring part 430 borders the inner surface of the housing part 100, the other side (right side based on Fig. 1) The return spring part 430 borders the outer surface of the screw nut part 420, and the return spring part 430 provides an elastic force for the screw bolt part 410, with which the screw nut part 420 is coupled.

[0067] The return spring part 430 can be compressed by the screw nut part 420, which moves linearly along the screw shaft 412. The return spring part 430 can be compressed by the screw nut part 420, which moves together with the screw bolt part 410 when the screw bolt part 410 slides relative to the gear part 200.

[0068] The return spring element 430 returns the nut element 420 and the bolt element 410 to their original positions by exerting an elastic force (elastic return force) on the nut element 420 and the bolt element 410. The return spring element 430 can be a coil spring that surrounds an outer surface of the piston element 500.

[0069] One end of the piston part 500 can be located in the master cylinder part 600, and the other end of the piston part 500 can be located in the housing part 100. The piston part 500 generates hydraulic brake pressure in the master cylinder part 600 by means of a linear movement of the motion conversion part 400.

[0070] The other end of the piston part 500 comes into contact with the screw nut part 420, and the piston part 500 moves forward towards the main cylinder part 600 as the screw nut part 420 moves forward (to the left based on Fig. 1) moves. The piston part 500 is designed in the form of a hollow column, and the screw shaft 412 is received in the piston part 500. During regenerative braking, general braking, or reserve braking, the piston part 500 can move forward toward the master cylinder part 600 and generate hydraulic brake pressure in the master cylinder part 600.

[0071] The main cylinder part 600 is coupled to the housing part 100 or formed integrally with the housing part 100. The interior of the main cylinder part 600 communicates with the interior of the housing part 100.

[0072] The pedal simulator 700 is coupled to the housing part 100 on a side opposite the main cylinder part 600. The pedal simulator 700 can be slid on the other side (right side based on Fig. 1) of the housing part 100. The screw bolt part 410 can be rotatably coupled to the pedal simulator 700.

[0073] The pedal simulator 700 can include a damper housing 710, the damper holder 720, a bearing part 730, a damper piston 740, a damper 750, a push rod 760, a pedal guard mounting part 770, a pedal spring 780 and the pedal guard 790.

[0074] The damper housing 710 can be coupled to the housing part 100. In one embodiment, the damper housing 710 can be coupled to the gearbox housing 110. The damper housing 710 can be designed in a hollow shape with an empty space and can be formed on two opposite sides (left and right sides based on Fig. 1) be open.

[0075] The damper mount 720 can be used with one side (left side based on Fig. 1) of the damper housing 710. The damper holder 720 can support the bolt body section 411 such that the bolt body section 411 is rotatable. The damper holder 720 can comprise a holder body section 721 and a holder projection section 722.

[0076] The holder body section 721 can have a ring shape with an open central section. The damper 750 can move through the open central section of the holder body section 721. The holder body section 721 can be coupled to the damper housing 710, thus fixing its position.

[0077] The holder projection section 722 is provided on the holder body section 721. The holder projection section 722 projects from an inner circumferential surface of the holder body section 721 in a direction opposite to a pedal P or a fork head 800. A cross-section of the holder projection section 722 can be in a "C" or "U" shape.

[0078] The retaining projection section 722 has a shape with a closed central section. Therefore, the damper 750, which is moved towards the retaining projection section 722 when the pedal P is pressed, can come into contact with the retaining projection section 722, and then the forward movement (movement to the left based on Fig. 1) of the damper 750 is suppressed. Therefore, the damper 750 is deformed and compressed by a pressure force of the pedal P transmitted via the damper piston 740 in the state in which the forward movement of the damper 750 is suppressed by the retaining projection section 722. As the degree to which the pedal P is depressed increases, so too does the degree to which the damper 750 is compressed by the retaining projection section 722 and the damper piston 740.

[0079] Part of the damper 750 can be accommodated in the holder projection section 722. The inner diameter of the holder projection section 722 can be smaller than the inner diameter of the holder body section 721. The holder projection section 722 can be inserted into the bolt body section 411.

[0080] The bearing part 730 can be provided on the damper bracket 720. The bearing part 730 can be coupled to an outer surface of the damper bracket 720 that faces the bolt part 410. More precisely, the bearing part 730 can be rotatably connected to an outer surface (left side based on Fig. 1) of the holder body section 721 coupled and provided in such a way that it surrounds an outer circumference of the holder projection section 722.

[0081] One end (right end based on Fig. 1) The bolt body section 411 sits on the bearing part 730. The bearing part 730 can support the bolt body section 411 so that the bolt body section 411 is rotatable. The bearing part 730 can support an axial load on the bolt part 410.

[0082] The damper piston 740 is located on a side opposite the damper holder 720. The damper piston 740 can be mounted in the damper housing 710 and configured to slide within the damper housing 710. More precisely, the damper piston 740 can be movably mounted within the damper housing 710.

[0083] The damper 750 can be coupled to the damper piston 740 and housed in the damper casing 710. The damper 750 can be arranged in a space defined by the damper casing 710, the damper holder 720, and the damper piston 740. The damper 750 can be compressed and deformed by the movement of the damper piston 740, which brings it into contact with the damper holder 720, in particular the holder projection section 722. As the amount of movement of the damper piston 740 increases, the amount of compression / deformation of the damper 750 also increases. The damper 750 can comprise an elastically deformable material. The damper 750 can comprise at least one of rubber, silicone, or plastic.

[0084] The pushrod 760 is coupled to the damper piston 740 and pushes the damper piston 740 when the pedal P is pressed. The pushrod 760 can move the damper piston 740 within the damper housing 710 in conjunction with the pressing of the pedal P. One side (right side based on Fig. 1) The pushrod 760 can be connected to the clevis 800, and the other end of the pushrod 760 can be connected to the damper piston 740. Therefore, if the clevis 800 is moved forward (to the left based on) by pressing pedal P Fig. 2) When the damper piston 740 is moved, the pushrod 760 can also move forward. The compression / deformation of the damper 750 is initiated when the damper 750 is brought into contact with the retaining projection section 722 by the forward movement of the damper piston 740. In the present embodiment, the clevis 800 is shown to be directly coupled to the pedal P, but the present disclosure is not limited thereto. Of course, the clevis 800 can be indirectly coupled by another element.

[0085] The push rod 760 can be rotated with an outer surface (right surface based on Fig. 1) of the damper piston 740 coupled by a joint or coupled to the damper piston 740 by crimping.

[0086] The push rod 760 can be coupled to the pedal guard mounting part 770. The push rod 760 can penetrate a central section of the pedal guard mounting part 770 and be coupled to the pedal guard mounting part 770. The pedal spring 780 can sit on the pedal guard mounting part 770, and the pedal guard mounting part 770 can be screwed to the push rod 760.

[0087] A first end 790a of the pedal guard 790 can be mounted on the pedal guard mounting part 770, and a second end 790b of the pedal guard 790 can be mounted on the housing part 100, e.g., the gearbox housing 110. The pedal guard 790 can surround the damper housing 710 and the pedal spring 780 to prevent dust, foreign matter, or the like from entering the push rod 760 and the pedal spring 780.

[0088] When an initial deceleration operation is performed by the driver pressing pedal P, the positions of the nut part 420 and the bolt part 410 remain unchanged due to the elastic force of the return spring part 430. In this case, the compression / deformation of the damper 750 is initiated as the pushrod 760 moves forward, and the driver can feel an initial braking sensation. A section in which the damper 750 is compressed and deformed to produce a pedal sensation, while the nut part 420 and the bolt part 410 remain stationary, can be defined as an initial deceleration section, i.e., a section with slight deceleration of the vehicle. The initial deceleration section can only be implemented through regenerative braking.

[0089] In the event that a second deceleration operation is performed by the driver pressing pedal P with greater force, the control unit 20 rotates the gear section 200 by operating the drive section 10 based on information acquired by a stroke sensor (not shown). The bolt body section 411, which engages with the third gear 230, is rotated by the rotation of the gear section 200, and the nut section 420 moves forward on the screw shaft 412. As the nut section 420 moves forward, the piston section 500, which is in contact with the nut body section 421, moves forward, thus generating hydraulic brake pressure in the master cylinder section 600.Since the piston part 500 supports the screw nut part 420 with a hydraulic reaction force in the state in which the return spring part 430 elastically supports the screw nut part 420, the screw bolt part 410, which engages with the screw nut part 420, does not move forward, and its position remains unchanged. Since the position of the screw bolt part 410 remains unchanged, the damper housing 710, which is coupled to the screw bolt part 410 by the bearing part 730, does not move forward, and its position remains unchanged. Therefore, the damper 750 continues to compress and deform during the second deceleration phase, allowing the driver to feel braking in the mid- to late-range. This section can be defined as a second deceleration phase, i.e., a phase of high-deceleration braking of the vehicle.The second deceleration phase can be implemented using regenerative braking and hydraulic braking.

[0090] If the driver presses pedal P, and the drive part 10, the transmission part 200, or the like is defective, the transmission part 200 will not rotate, and the bolt part 410 will slide forward on the third gear 230. In this case, because the piston part 500 is moved forward by pressing the bolt part 410, hydraulic brake pressure is generated in the master cylinder part 600. A section in which the hydraulic brake pressure is generated as described above can be defined as a reserve brake section.

[0091] While the present disclosure has been described with reference to the embodiments shown in the drawings, these embodiments serve only for illustrative purposes, and those skilled in the art in the field to which the present technology relates will understand that various modifications of the embodiments and all other equivalent embodiments are available. Accordingly, the true technical scope of protection of the present disclosure should be determined by the accompanying claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] KR 10-2372394

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