Motor

Abstract

The invention may provide a motor comprising: a shaft; a rotor coupled to the shaft; a stator provided to correspond to the rotor; a housing for receiving the stator and the rotor; a rotating portion fixed to the shaft; an engaging portion rotatably provided in the housing and in contact with the rotating portion to restrain rotation of the shaft; and a locking portion provided in the housing to control rotation of the engaging portion.

Description

Technical Field

[0001] This invention relates to motors. Background Technology

[0002] A vehicle's electronic braking system is a system that brakes the vehicle through the operation of a motor and a reducer. Compared to mechanical braking systems, electronic braking systems have advantages such as lighter weight, better responsiveness, and less installation space constraints. Furthermore, the vehicle's electric parking brake is a device that automatically operates using an actuator based on the vehicle's operating status, even when the driver is not manually operating the vehicle.

[0003] Such an electric parking brake can be configured such that the brake shoes in the wheel drum brake (DIH) are extended by the tension generated by pulling the parking cable through the rotation of the motor to ensure braking force, or the main shaft moves the piston forward through the rotation of the motor to make the disc and pad in close contact with each other to ensure braking force.

[0004] In order to realize the function of the electric parking brake, the structure of the electric parking brake should be added to the electronic braking system. Therefore, the problem is that it requires a large installation space and the structure of related components such as the reducer is complex. Summary of the Invention

[0005] [Technical Issues]

[0006] Therefore, the present invention aims to solve the above-mentioned problems and to provide a motor in which a parking brake function is added to an electronic braking system to simplify the structure of the entire braking system.

[0007] The objectives of this invention are not limited to those described above, and those skilled in the art can clearly understand other objectives not described above through the following description.

[0008] [Technical Solution]

[0009] One embodiment may provide a motor comprising: a shaft; a rotor coupled to the shaft; a stator configured to correspond to the rotor; a housing housing the stator and the rotor; a rotating portion fixed to the shaft; a connecting portion rotatably disposed on the housing and in contact with the rotating portion to constrain rotation of the shaft; and a locking portion disposed in the housing and constraining rotation of the connecting portion.

[0010] The locking portion may include a first locking portion and a second locking portion, which are positioned radially spaced from the shaft and movably disposed in the axial direction; and the first locking portion and the second locking portion may sequentially contact the joint portion to constrain the rotation of the joint portion.

[0011] A portion of the rotating part and a portion of the joining part may selectively overlap in the circumferential direction.

[0012] A portion of the first locking part may be configured to selectively overlap with the joint in the circumferential direction, and a portion of the second locking part may be configured to overlap with the joint in the axial direction.

[0013] The first locking part can be configured to overlap with the joint in the circumferential direction to constrain the rotation of the joint.

[0014] The lower surface of the joint can be formed as an inclination.

[0015] When the first locking part does not restrict the rotation of the joint, the second locking part can push the lower surface of the joint to make the joint rotate.

[0016] The motor may also include a first elastic member disposed on the housing, the first elastic member contacting the engagement portion and providing elastic force, causing the engagement portion to rotate toward the rotating portion.

[0017] The joint may include: a first shaft portion disposed on the housing; an arm portion rotatably connected to the first shaft portion; and a tip portion protruding from the arm portion and contacting the rotating portion, wherein a first elastic member may contact the tip portion.

[0018] The first elastic member can be a torsion spring, the axis of which is parallel to the axial direction of the shaft.

[0019] The axial direction of the joint can be parallel to the axial direction of the shaft.

[0020] The first locking part may include a first cylinder, a first plunger disposed inside the first cylinder, and a first coil disposed inside the first cylinder; the second locking part may include a second cylinder, a second plunger disposed inside the second cylinder, and a second coil disposed inside the second cylinder; when current is applied to each of the first coil and the second coil, the first plunger may move along the first cylinder, and the second plunger may move along the second cylinder; the first plunger may be configured to selectively overlap with the engagement in the circumferential direction; and the second plunger may selectively contact the lower surface of the engagement.

[0021] When current is applied to each of the first and second coils, the direction of movement of the first plunger and the direction of movement of the second plunger can be opposite to each other.

[0022] The first locking part may include a second elastic member disposed between the first cylinder and the first plunger; the second locking part may include a third elastic member disposed between the second cylinder and the second plunger; the second elastic member may be a helical spring having a restoring force when extended; and the third elastic member may be a helical spring having a restoring force when contracted.

[0023] The housing may include a body disposed outside the stator and an extension portion extending radially from the body; and the extension portion may include a first receiving portion having a space for receiving a first locking portion and a second receiving portion having a space for receiving a second locking portion.

[0024] The housing may include a body disposed outside the stator and an extension portion extending radially from the body; and the extension portion may include a second shaft portion and a stop member in contact with a first elastic member, the first elastic member being rotatably connected to the second shaft portion.

[0025] [Beneficial Effects]

[0026] According to one embodiment of the present invention, since the parking brake function is added to the electronic braking system, it has the advantage of simplifying the structure of the entire braking system.

[0027] According to one embodiment of the present invention, since the motor shaft of the electronic braking system is directly constrained, a separate parking brake structure is not required, thus having the advantage of reducing installation space and the number of components.

[0028] According to one embodiment of the present invention, since the shaft is constrained by a solenoid-type locking part, it has the advantage of making it easier to implement the parking brake function. Attached Figure Description

[0029] Figure 1 This is a view showing a motor according to an embodiment.

[0030] Figure 2 It is shown Figure 1 An exploded view of the motor shown.

[0031] Figure 3 It is shown Figure 1 The motor is shown in the side view.

[0032] Figure 4 This is a view showing the rotating part.

[0033] Figure 5 This is a view showing the joint.

[0034] Figure 6 It shows along Figure 5 A cross-sectional view of the joint of line AA.

[0035] Figure 7 This is a view showing the joint, the first locking part, and the second locking part.

[0036] Figure 8 This is an exploded view showing the first locking part and the second locking part.

[0037] Figure 9 This is a view showing either the first or second plunger.

[0038] Figure 10 This is a side cross-sectional view showing the first locking part.

[0039] Figure 11 This is a side cross-sectional view showing the second locking part.

[0040] Figure 12 This is a view showing the casing.

[0041] Figure 13 This is a view showing the state in which the shaft is unconstrained when no current is applied to the first and second locking parts.

[0042] Figure 14 It is shown in Figure 13 The view showing the positions of the first and second locking parts corresponding to the joint in the current state.

[0043] Figure 15 This is a view showing the state in which the shaft is constrained by the joint when power is applied to the first locking part and the second locking part.

[0044] Figure 16 It is shown in Figure 15 The view showing the positions of the first and second locking parts corresponding to the joint in the current state.

[0045] Figure 17 This is a view showing the positions of the first and second locking parts when the rotating part is constrained by the joint.

[0046] Figure 18 This is a view showing the state in which the constraint on the shaft is released as the joint disengages from the rotating part when power is applied to the first and second locking parts while the shaft is constrained by the joint.

[0047] Figure 19 It is shown in Figure 18 The view showing the positions of the first and second locking parts corresponding to the joint in the current state.

[0048] Figure 20 This is a view showing the state of the first plunger moving engagement of the first locking part.

[0049] Figure 21This is a view showing the positions of the first and second locking parts when the joint is disengaged from the rotating part and the power is cut off. Detailed Implementation

[0050] In the following, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0051] However, the spirit of the present invention is not limited to the embodiments to be described, but can be implemented in various different forms, and one or more components of the embodiments can be selectively combined, substituted and used within the scope of the spirit of the present invention.

[0052] Furthermore, unless otherwise clearly and specifically defined by the context, all terms used herein (including technical and scientific terms) are to be interpreted as having the meaning commonly understood by those skilled in the art, and the meaning of commonly used terms, such as those defined in common dictionaries, will be interpreted in light of the contextual meaning of the relevant art.

[0053] Furthermore, the terminology used in the embodiments of the present invention is for descriptive purposes only and is not intended to limit the invention.

[0054] In this specification, unless the context clearly indicates otherwise, the singular form includes the plural form, and in the case of describing “at least one (or one or more) of A, B and C”, this may include at least one combination of all possible combinations of A, B and C.

[0055] Furthermore, in the description of the components of the present invention, terms such as "first", "second", "A", "B", "(a)" and "(b)" may be used.

[0056] These terms are used only to distinguish one component from another, and the nature, order, etc., of the components are not limited by these terms.

[0057] Additionally, it should be understood that when the first component is referred to as “connected,” “linked,” or “coupled” to the second component, such a description can include both cases where the first component is directly connected, linked, or linked to the second component, and cases where the first component is connected, linked, or linked to the second component through a third component disposed between the first and second components.

[0058] Additionally, when the first component is described as being formed or disposed "above" or "below" the second component, such a description includes both the case where the two components are formed or disposed in direct contact with each other and the case where one or more other components are located between the two components. Furthermore, when the first component is described as being formed "above" or "below" the second component, such a description can include the case where the first component is formed on the upper or lower side relative to the second component.

[0059] Figure 1 This is a view showing a motor according to an embodiment. Figure 2 It is shown Figure 1 The exploded view of the motor shown, and Figure 3 It is shown Figure 1 The motor is shown in the side view.

[0060] Reference Figures 1 to 3 According to the embodiments, the motor may include a shaft 100, a rotor 200, a stator 300, a rotating part 400, a connecting part 500, a first locking part 600, a second locking part 700, and a housing 800.

[0061] In the following text, the circumferential and radial directions are defined based on the motor's axis. The axis of the rotating part 400 may be the same as the motor's axis. The axis of the first locking part 600 may be parallel to the motor's axis.

[0062] In the following text, in addition to the vehicle's braking function, the motor also has the feature of a parking brake function.

[0063] Shaft 100 can be connected to rotor 200.

[0064] The rotor 200 rotates through electromagnetic interaction with the stator 300. The rotor 200 may be configured to correspond to the stator 300. The rotor may be disposed radially inside the stator 300. The rotor 200 may include magnets.

[0065] The stator 300 can be disposed outside the rotor 200. The stator 300 may include a stator core 310, an insulator 320, and a coil 330. The insulator 320 is mounted on the stator core 310. The coil 330 can be wound around the insulator 320. The insulator 320 can be disposed between the coil 330 and the stator core 310, and can electrically insulate the stator core 310 from the coil 330.

[0066] The rotating part 400 can be connected to the shaft 100. The rotating part 400 can be disposed outside the housing 800. When the shaft 100 rotates, the rotating part 400 can rotate integrally with the shaft 100. The rotating part 400 is connected to the first locking part 600 for selectively restraining the shaft 100. The rotating part 400 can also be configured to overlap with the rotor 200 in the axial direction.

[0067] The joint 500 can be rotatably connected to the housing 800. The axial direction of the joint 500 can be parallel to the axial direction of the shaft 100. The joint 500 engages with the rotating part 400 to constrain the shaft 100.

[0068] The locking part may include a first locking part 600 and a second locking part 700.

[0069] The first locking part 600 can be connected to the housing 800. The first locking part 600 is a component that, when the vehicle is stopped and a signal is applied to the vehicle, constrains the rotation of the shaft 100 by controlling the rotation of the engagement part 500, thereby realizing the parking brake function. Specifically, the first locking part 600 is configured to selectively overlap with the engagement part 500 in the circumferential direction for constraining the rotation of the engagement part 500.

[0070] The first locking part 600 can be connected to the connector 10. The first locking part 600 can be disposed outside the housing 800. The first locking part 600 can be configured not to overlap with the rotor 200 or the stator 300 in the axial direction. In addition, the first locking part 600 can be configured not to overlap with the rotor 200 or the stator 300 even in the radial direction.

[0071] The second locking part 700 can be connected to the housing 800. The second locking part 700 is another component that, together with the first locking part 600, constrains the rotation of the shaft 100 by controlling the rotation of the engagement part 500 when the vehicle is stopped and a signal is applied to the vehicle, thereby realizing the parking brake function. Specifically, the second locking part 700 is configured to selectively overlap with the engagement part 500 in the axial direction to push the lower surface of the engagement part 500 and cause the engagement part to rotate.

[0072] The second locking part 700 can also be connected to the connector 10. The second locking part 700 can be configured not to overlap with the rotor 200 or the stator 300 in the axial direction. In addition, the second locking part 700 can be configured not to overlap with the rotor 200 or the stator 300 even in the radial direction.

[0073] Both the first locking part 600 and the second locking part 700 can be located within the rotation radius of the engagement part 500. In addition, the first locking part 600 can be configured to be further away from the axis of the engagement part 500 than the second locking part 700.

[0074] The housing 800 is located outside the stator 300.

[0075] The joint 500 is composed of the first elastic member S1 (see...) Figure 7 The first elastic member S1 is disposed in the housing 800 and provides elastic force, causing the engagement portion 500 to rotate toward the rotating portion 400. The first elastic member S1 may be a torsion spring that contacts the engagement portion 500.

[0076] Figure 4 This is a view showing the rotating part 400.

[0077] Reference Figure 4 The rotating part 400 may be a disc component. The rotating part 400 may include a hole H through which the shaft 100 passes. The hole H may be located in the central portion of the rotating part 400. Additionally, the rotating part 400 may include a plurality of groove portions G. The groove portions G may be configured to be recessed inward from the edge of the rotating part 400. The plurality of groove portions G may be arranged at predetermined intervals along the edge of the rotating part 400.

[0078] Figure 5 This is a view showing the joint 500, and Figure 6 It shows the joint 500 along Figure 5 A cross-sectional view of line AA.

[0079] Reference Figures 4 to 6 The joint 500 may include a first shaft portion C1, an arm portion 520, and a tip portion 530. The first shaft portion C1 may be coupled to the housing 800. The axial direction of the first shaft portion C1 may be parallel to the axial direction of the shaft 100. One end of the arm portion 520 may be rotatably coupled to the first shaft portion C1. The arm portion 520 may be rotatable about the first shaft portion C1. The arm portion 520 may have a shape in which the cross-sectional dimensions decrease towards the other end of the arm portion 520. The tip portion 530 may extend from the other end of the arm portion 520. The tip portion 530 may extend perpendicularly to the arm portion 520 from the other end of the arm portion 520. The tip portion 530 is inserted into one of the slot portions G of the rotating portion 400. The end of the tip portion 530 may be formed to be sharp to facilitate insertion into the slot portion G of the rotating portion 400.

[0080] The lower surface 501 of the joint 500 may be a convexly curved surface. This configuration is used to cause rotation of the joint 500 when the second locking part 700 pushes the convex lower surface 501 of the joint 500.

[0081] Figure 7 This is a view showing the joint 500, the first locking part 600, and the second locking part 700, and Figure 8 This is an exploded view showing the first locking part 600 and the second locking part 700.

[0082] Locking parts 600 and 700 can control the rotation of the engaging part 500. The rotation of the engaging part 500 can be constrained, or the engaging part 500 can be rotated according to the sequence of the locking parts 600 and 700.

[0083] Reference Figure 7 and Figure 8 The first locking part 600 and the second locking part 700 can be positioned axially below the engaging part 500. Furthermore, the second locking part 700 can be positioned closer to the first shaft portion C1 of the engaging part 500 than the first locking part 600. The first elastic member S1 contacts the side surface of the engaging part 500 to provide elasticity, which generally causes the engaging part 500 to move closer to the rotating part 400.

[0084] The first locking part 600 may include a first cylinder 610, a first coil 620, and a first plunger 630.

[0085] The first cylinder 610 may be a hollow cylindrical component therein. A first plunger 630 may be disposed inside the first cylinder 610. A first coil 620 may be disposed in the first cylinder 610. The first plunger 630 is disposed in the hollow of the first cylinder 610 and reciprocates linearly. A contact area may be formed between the first cylinder 610 and the engagement portion 500 to prevent the engagement portion 500 from rotating when the first cylinder 610 moves in the axial direction.

[0086] The second locking part 700 may include a second cylinder 710, a second coil 720, and a second plunger 730.

[0087] The second cylinder 710 may be a hollow cylindrical member therein. A second plunger 730 may be disposed inside the second cylinder 710. A second coil 720 may be disposed in the second cylinder 710. The second plunger 730 is disposed in the hollow of the second cylinder 710 and reciprocates linearly. A contact area is formed between the second cylinder 710 and the lower surface 501 of the engagement portion 500 to rotate the engagement portion 500 when the second cylinder 710 moves in the axial direction.

[0088] Figure 9 This is a view showing either the first plunger 630 or the second plunger 730.

[0089] Reference Figure 9 The first plunger 630 and the second plunger 730 can have the same shape and size.

[0090] Each of the first plunger 630 and the second plunger 730 may include a protrusion P at its front end. In particular, the protrusion P of the second plunger 730 may contact the protruding lower surface 501 of the engagement 500 to cause rotation of the engagement 500.

[0091] The first plunger 630 may include a first flange 631. The first flange 631 may protrude from the outer surface of the first plunger 630 and may be disposed along a circumferential portion of the first plunger 630. The first flange 631 is used to support the second elastic member S2 (see...). Figure 10 ).

[0092] The second plunger 730 may include a second flange 731. The second flange 731 may project from the outer surface of the second plunger 730 and may be disposed along a circumferential portion of the second plunger 730. The second flange 731 is used to support the third elastic member S3 (see...). Figure 11 ).

[0093] Each of the first plunger 630 and the second plunger 730 may be formed of a metallic material.

[0094] Figure 10 This is a side cross-sectional view showing the first locking part 600.

[0095] Reference Figure 10 The first locking part 600 may include a second elastic member S2. The second elastic member S2 may be disposed between the first flange 631 and the first cylinder 610 in the direction of movement of the first plunger 630. The second elastic member S2 may be a helical spring with restoring force when contracted. When no current is applied to the first coil 620, the second elastic member S2 can be used to keep the first plunger 630 protruding outward from the first cylinder 610.

[0096] Figure 11 This is a side cross-sectional view showing the second locking part 700.

[0097] Reference Figure 11 The second locking part 700 may include a third elastic member S3. The third elastic member S3 may be disposed between the second flange 731 and the second cylinder 710 in the direction of movement of the second plunger 730. The third elastic member S3 may be a helical spring with restoring force when extended. When no current is applied to the second coil 720, the second plunger 730 may be positioned and held in the second cylinder 710 by the third elastic member S3.

[0098] Figure 12 This is a view showing the housing 800.

[0099] Reference Figure 12 The housing 800 may include a body 810 and an extension 820. The body 810 is a cylindrical member having a space formed therein for accommodating the rotor 200 and the stator 300. The extension 820 may be formed to extend radially from the upper end of the body 810.

[0100] The extension portion 820 may include a first receiving portion 821 and a second receiving portion 822. A space for receiving the first locking part 600 may be formed in the first receiving portion 821. Additionally, a space for receiving the second locking part 700 may be formed in the second receiving portion 822. As described above, since the first receiving portion 821 and the second receiving portion 822 are provided in the extension portion 820, a housing for receiving the first locking part 600 and the second locking part 700 is not required.

[0101] Additionally, the extension portion 820 may include a second shaft portion C2. The second shaft portion C2 protrudes from one surface of the extension portion 820. The second shaft portion C2 is a component on which a first elastic member S1 is mounted. The first elastic member S1 may be disposed on the housing 800 and may provide elasticity, causing the engagement portion 500 to rotate toward the rotating portion 400. The first elastic member S1 may rotate about the second shaft portion C2.

[0102] The extension portion 820 may include a stop 823. The stop 823 may contact the first elastic member S1 to support the first elastic member S1. The stop 823 may protrude from one surface of the extension portion 820. The stop 823 may be positioned close to the second shaft portion C2. One end of the first elastic member S1 may contact the stop 823, and the other end of the first elastic member S1 may contact the engagement portion 500.

[0103] Figure 13 This is a view showing the shaft in an unconstrained state when no current is applied to the first locking part 600 and the second locking part 700, and Figure 14 It is shown in Figure 13 The view showing the positions of the first locking part 600 and the second locking part 700 corresponding to the joint 500 in the state.

[0104] When the vehicle is moving or stopped, no power is applied to the first coil 620 and the second coil 720 without an additional signal. Figure 13 and Figure 14 As shown, in this normal state, the first plunger 630 of the first locking part 600 protrudes due to the second elastic member S2, and is thus positioned to be hooked on one side surface of the engagement part 500. Although the engagement part 500 is subjected to a rotational force because the first elastic member S1 is positioned on the other side surface of the engagement part 500, the first plunger 630 contacts one side surface of the engagement part 500, thereby preventing the engagement part 500 from rotating.

[0105] In this case, since the second plunger 730 is positioned in the second cylinder 710 due to the third elastic member S3, the second plunger 730 does not contact the engagement portion 500.

[0106] Figure 15 This is a view showing the state in which the shaft 100 is constrained by the engagement portion 500 when power is applied to the first locking portion 600 and the second locking portion 700, and Figure 16 It is shown in Figure 15 The view showing the positions of the first locking part 600 and the second locking part 700 corresponding to the joint 500 in the state.

[0107] When the vehicle is in a parked state, an input signal related to the parking brake applies power to the first coil 620 and the second coil 720. Through the electromagnetic interaction between the first coil 620 and the first plunger 630, the first plunger 630 moves linearly along the first cylinder 610. The first plunger 630 overcomes the restoring force of the second elastic member S2 and enters the first cylinder 610. As the first plunger 630 enters the first cylinder 610 and disengages from the engagement portion 500, the engagement portion 500 rotates towards the rotating portion 400 due to the first elastic member S1.

[0108] Simultaneously, through the electromagnetic interaction between the second coil 720 and the second plunger 730, the second plunger 730 moves linearly along the second cylinder 710 with a time difference compared to the first plunger 630. The time difference between the movement of the first plunger 630 and the second plunger 730 can be determined based on current control, differences in the diameter, length, and elastic coefficient between the first coil 620 and the second coil 720, and differences in the size and weight between the first plunger 630 and the second plunger 730. The second plunger 730 can move against the restoring force of the third elastic member S3 until it contacts the lower surface 501 of the engagement portion 500.

[0109] Figure 17 This is a view showing the positions of the first locking part 600 and the second locking part 700 when the joint 500 is constraining the rotating part 400 and the power is off.

[0110] Reference Figure 17 When the engagement portion 500 is hooked in the groove portion G of the rotating portion 400 due to the first elastic member S1, and when the first locking portion 600 and the second locking portion 700 are de-energized due to a state such as the vehicle's engine stopping, the first plunger 630 protrudes outward from the first cylinder 610 due to the restoring force of the second elastic member S2, and is positioned to be hooked on the other side surface of the engagement portion 500. Furthermore, the second plunger 730 enters the second cylinder 710 due to the restoring force of the third elastic member S3, thereby separating itself from the engagement portion 500.

[0111] Since the first plunger 630 supports the other side surfaces of the engagement portion 500 in addition to the restoring force of the first elastic member S1, the engagement portion 500 does not rotate and remains engaged with the rotating portion 400 to restrain the rotation of the shaft 100. That is, when the first locking portion 600 and the second locking portion 700 are de-energized, the rotation of the shaft 100 can be suppressed to achieve the parking brake function.

[0112] Figure 18 This is a view showing the state in which the constraint on the shaft 100 is released as the engagement 500 disengages from the rotating part 400 when the first locking part 600 and the second locking part 700 are energized while the shaft 100 is constrained by the engagement 500. Figure 19 It is shown in Figure 18 The view of the first locking part 600 and the second locking part 700 corresponding to the position of the joint 500 in the state.

[0113] When a signal such as starting a vehicle's engine is generated, current is applied to each of the first locking part 600 and the second locking part 700 while the engagement part 500 is engaged with the rotating part 400. When current is applied to each of the first locking part 600 and the second locking part 700, the first plunger 630 overcomes the restoring force of the second elastic member S2 and enters the first cylinder 610. Since the first plunger 630 enters the first cylinder 610 and the contact between the first plunger 630 and the engagement part 500 is released, the engagement part 500 enters a state where it can rotate over the restoring force of the first elastic member S1.

[0114] Figure 20 This is a view showing the state of the first plunger 630 moving the engagement portion 500 of the first locking portion 600.

[0115] like Figure 20 As shown, the second plunger 730 moves against the restoring force of the third elastic member S3, while simultaneously pushing the lower surface 501 of the engagement portion 500. In the state where the engagement portion 500 is engaged with the rotating portion 400, the protrusion P of the second plunger 730 is positioned outside the width center of the engagement portion 500, and closer to the rotating portion 400 than the width center CL of the engagement portion 500. Therefore, when the protrusion P of the second plunger 730 pushes the lower surface 501 of the engagement portion 500 upwards, the engagement portion 500 rotates away from the rotating portion 400.

[0116] As described above, the second plunger 730 moves the engagement member 500 until the engagement member 500 reaches the position of the engagement member 500 in the normal state.

[0117] Figure 21This is a view showing the positions of the first locking part 600 and the second locking part 700 when the engagement part 500 has disengaged from the rotating part 400.

[0118] Reference Figure 21 When the vehicle is moving or stopped, without any additional signal and with the first locking part 600 and the second locking part 700 de-energized, the first plunger 630 of the first locking part 600 protrudes due to the second elastic member S2 and is positioned to be hooked on one side surface of the engagement part 500. Although the engagement part 500 is subjected to rotational force due to the first elastic member S1 being positioned on the other side surface of the engagement part 500, the first plunger 630 on one side surface of the engagement part 500 still prevents the engagement part 500 from rotating. In this case, since the second plunger 730 is positioned within the second cylinder 710 due to the third elastic member S3, the engagement part 500 does not contact the second plunger 730.

[0119] Since the rotating part 400 of the motor shaft 100 connected to the electronic parking system is constrained, a separate parking brake structure is not required, thereby reducing installation space and the number of parts. Furthermore, since the shaft 100 is constrained by a solenoid-type locking part, the parking brake function can be implemented more easily. In particular, the parking brake function can be performed using two locking parts while the power to the locking parts is cut off.

[0120] A motor according to an exemplary embodiment of the present invention has been described above with reference to the accompanying drawings.

[0121] The above embodiments should be considered descriptive only and not for limiting purposes, and the scope of the invention is defined not by the detailed description but by the appended claims. Furthermore, it should be understood that the scope of the invention covers all modifications and variations derived from the meaning and scope of the appended claims and their equivalents.

Claims

1. A motor comprising: a shaft; a rotor coupled to the shaft; a stator disposed corresponding to the rotor; a housing accommodating the stator and the rotor; a rotation portion fixed to the shaft; an engagement portion rotatably disposed on the housing and in contact with the rotation portion to restrain rotation of the shaft; and a locking portion disposed in the housing and restraining rotation of the engagement portion. 2.The motor of claim 1, wherein: the locking portion comprises first and second locking portions positioned to be spaced apart from the shaft in a radial direction and movably disposed in an axial direction; and the first and second locking portions sequentially come into contact with the engagement portion to restrain rotation of the engagement portion. a portion of the rotation portion selectively overlaps a portion of the engagement portion in a circumferential direction.

3. The motor of claim 2, wherein, 4.The motor of claim 3, wherein: a portion of the first locking portion is disposed to selectively overlap the engagement portion in the circumferential direction; and a portion of the second locking portion is disposed to overlap the engagement portion in the axial direction. the first locking portion is disposed to overlap the engagement portion in a circumferential direction to restrain rotation of the engagement portion.

5. The motor of claim 2, wherein, a lower surface of the engagement portion is formed to be inclined.

6. The motor of claim 2, wherein, in a state in which the first locking portion does not restrain rotation of the engagement portion, the second locking portion pushes the lower surface of the engagement portion to rotate the engagement portion.

7. The motor of claim 6, wherein, 8.The motor of claim 2, further comprising a first elastic member disposed on the housing, the first elastic member being in contact with the engagement portion and providing an elastic force such that the engagement portion rotates toward the rotation portion. the engagement portion comprises:

9. The motor of claim 8, wherein, a first shaft portion disposed on the housing; an arm portion rotatably coupled to the first shaft portion; and a tip portion protruding from the arm portion and in contact with the rotation portion, wherein the first elastic member is in contact with the tip portion. the first elastic member comprises a torsion spring, a shaft center of the torsion spring being parallel to an axial direction of the shaft.

10. The motor of claim 8, wherein, an axial direction of the engagement portion is parallel to the axial direction of the shaft.

11. The motor of claim 1, wherein, 12.The motor of claim 2, wherein: the first locking portion comprises a first cylinder, a first plunger disposed inside the first cylinder, and a first coil disposed inside the first cylinder; the second locking portion comprises a second cylinder, a second plunger disposed inside the second cylinder, and a second coil disposed inside the second cylinder; when an electric current is applied to each of the first and second coils, the first plunger moves along the first cylinder and the second plunger moves along the second cylinder; the first plunger is disposed to selectively overlap the engagement portion in a circumferential direction; and the second plunger selectively comes into contact with a lower surface of the engagement portion. ​ 13. The motor of claim 12, wherein, When the current is applied to each of the first coil and the second coil, a moving direction of the first plunger and a moving direction of the second plunger are opposite to each other. 14.The motor of claim 12, wherein: the first locking portion includes a second elastic member disposed between the first cylinder and the first plunger; the second locking portion includes a third elastic member disposed between the second cylinder and the second plunger; the second elastic member includes a coil spring having a restoring force when stretched; and the third elastic member includes a coil spring having a restoring force when contracted. 15.The motor of claim 2, wherein: the housing includes a body disposed outside the stator and an extension portion extending from the body in a radial direction; and the extension portion includes a first accommodation portion formed with a space to accommodate the first locking portion and a second accommodation portion formed with a space to accommodate the second locking portion. 16.The motor of claim 8, wherein: the housing includes a body disposed outside the stator and an extension portion extending from the body in a radial direction; and the extension portion includes a second shaft portion and a stopper in contact with the first elastic member, the first elastic member being rotatably coupled to the second shaft portion.

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