Motor

Abstract

The present invention may provide a motor including: a shaft; a rotor coupled to the shaft; a stator arranged to correspond to the rotor; a rotating part fixed to the shaft; and a locking portion arranged to be spaced apart from the shaft in a radial direction of the shaft, in which the locking portion includes a stopper movable toward the rotating portion, and if a signal is applied to the locking portion, the stopper is coupled to the rotating portion by concave-convex engagement to restrict rotation of the shaft.

Description

TECHNICAL FIELD

[0001] The present application relates to a motor. BACKGROUND

[0002] An electronic brake system of a vehicle is a system that brakes a vehicle by operation of a motor and a reducer, and has advantages of light weight, good responsiveness, and less limitation of installation space compared to a mechanical brake system. In addition, an electric parking brake of a vehicle is a device that is automatically operated using an actuator according to an operating state of a vehicle even when a driver does not manually operate the vehicle.

[0003] Such an electric parking brake can be formed in a structure in which a brake shoe in a drum-in-hat (DIH) brake of a wheel is opened by tension generated by rotation of a motor to pull a parking cable, to secure a braking force, or a spindle rotates a piston forward to make a brake disc and a brake pad closely contact each other to secure a braking force.

[0004] Since a structure of an electric parking brake should be added to an electronic brake system to implement an electric parking brake function, there is a problem in that a large installation space is required, and a structure of a related part such as a reducer is complicated. SUMMARY

[0005] TECHNICAL PROBLEM

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

[0007] The object to be achieved by the present application is not limited to the above-described object, and other objects not described above can be clearly understood by those skilled in the art from the following description.

[0008] TECHNICAL SOLUTION

[0009] An embodiment provides a motor including a shaft, a rotor coupled to the shaft, a stator disposed corresponding to the rotor, a rotation part fixed to the shaft, and a locking part disposed to be spaced apart from the shaft in a radial direction, wherein the locking part includes a stopper movable toward the rotation part, and when a signal is applied to the locking part, the stopper is engaged with the rotation part in a concave-convex manner to restrict rotation of the shaft.

[0010] Parts of the rotation part and the locking part can overlap in a circumferential direction.

[0011] The stopper can be movable in an axial direction and coupled to the rotation part in a concave-convex manner.

[0012] The rotation portion can include a plurality of groove portions, and the stopper can be inserted into one of the groove portions.

[0013] At least a portion of the stopper can overlap the groove portion in an axial direction.

[0014] The groove portion can be formed at a predetermined interval to be recessed inward from an edge of the rotation portion.

[0015] At least a portion of an inner surface of the groove portion, which contacts the protrusion, can be formed to be inclined.

[0016] The stopper can overlap the stator in an axial direction.

[0017] The locking portion can include a cylinder provided at an outside of the stopper, and a coil provided in the cylinder.

[0018] The locking portion can further include an elastic member provided between the cylinder and the stopper.

[0019] The motor can further include a body accommodating the stator and the rotor and having a portion thereof opened, and a cover covering the body, wherein the cover can include an accommodation portion accommodating the locking portion.

[0020] Advantageous Effects

[0021] According to one embodiment of the present application, since a parking brake function is added to an electronic brake system, there is an advantage of simplifying the structure of the entire brake system.

[0022] According to one embodiment of the present application, since a shaft of a motor of an electronic brake system is directly restricted, a separate parking brake component is not required, and thus there is an advantage of reducing the installation space and the number of components.

[0023] According to one embodiment of the present application, since a shaft is restricted by a solenoid type stopper, there is an advantage of more easily implementing a parking brake function. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a perspective view showing a motor according to an embodiment.

[0025] Figure 2 FIG. 2 is a side sectional view showing the motor shown in FIG. 1, and Figure 1 FIG. 3 is an exploded view showing the motor shown in FIG. 1. Figure 3 Figure 1 FIG. 4 is an exploded view showing the motor shown in FIG. 1.

[0026] Figure 3 FIG. 5 is an exploded view showing the motor shown in FIG. 1. Figure 1

[0027] Figure 4 FIG. 6 is an exploded view showing a locking portion.​​

[0028] Figure 5 is a plan view showing Figure 3 a plan view of the stopper.

[0029] Figure 6 is a side cross-sectional view showing the locking portion.

[0030] Figure 7 is a view showing a shaft to which the rotating portion is coupled.

[0031] Figure 8 is a view showing the rotating portion.

[0032] Figure 9 is a view showing a cap of the housing.

[0033] Figure 10 is a view showing the shaft unlocked in a state in which no current is applied to the locking portion.

[0034] Figure 11 is a view showing positions of the groove portion and the protrusion in a state in which the shaft is unlocked.

[0035] Figure 12 is a view showing the shaft restricted by the stopper when power is applied to the locking portion.

[0036] Figure 13 is a view showing the protrusion coupled to the groove portion. DETAILED DESCRIPTION

[0037] Hereinafter, exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0038] However, the technical spirit of the present application is not limited to some embodiments to be described and can be implemented in various different forms, and one or more components of the embodiments can be selectively combined, replaced, and used within the scope of the technical spirit of the present application.

[0039] In addition, unless otherwise clearly and specifically defined by the context, all terms used herein, including technical terms and scientific terms, can be interpreted according to the meaning commonly understood by one of ordinary skill in the art to which the present application pertains, and the meaning of terms commonly used, for example, those defined in a generally used dictionary, will be interpreted in the context of the relevant art.

[0040] In addition, the terms used in the embodiments of the present application are considered only in a descriptive sense and not for the purpose of limiting the present application.

[0041] In the present specification, the singular form includes the plural form unless specifically indicated otherwise by the context, and in the case of describing "at least one of A, B, and C (or one or more of A, B, and C)," this can include at least one of all possible combinations of A, B, and C.

[0042] In addition, in the description of components of the present application, terms such as "first," "second," "A," "B," "(a)," and "(b)" can be used.

[0043] These terms are used only to distinguish one component from another component, and the nature, order, etc., of the components are not limited by these terms.

[0044] In addition, it should be understood that when a first component is referred to as being "connected," "coupled," or "linked" to a second component, such description can include the case where the first component is directly connected, coupled, or linked to the second component and the case where the first component is connected, coupled, or linked to the second component with a third component interposed therebetween.

[0045] In addition, when a first component is described as being formed or disposed "on (above) or "under" a second component, such description includes the case where the two components are formed or disposed to be in direct contact with each other and the case where one or more other components are interposed therebetween. In addition, when a first component is described as being formed "on (above) or "under" a second component, such description can include the case where the first component is formed at an upper side or a lower side with respect to the second component.

[0046] Figure 1 is a view showing a motor according to an embodiment, Figure 2 is a view showing Figure 1 a side cross-sectional view of the motor shown, Figure 3 is a view showing Figure 1 an exploded view of the motor shown.

[0047] Referring to Figures 1 to 3 , a motor according to an embodiment can include a shaft 100, a rotor 200, a stator 300, a locking portion 400, a housing 500, and a rotating portion 600.

[0048] Hereinafter, a circumferential direction and a radial direction are defined based on an axial center of the motor.

[0049] Hereinafter, the motor has a feature of having a parking brake function in addition to a brake function of a vehicle.

[0050] Both end portions of the shaft 100 can be rotatably supported in the axial direction by bearings. In the shaft 100, portions having different outer diameters from each other can be separately provided in the axial direction.

[0051] The rotor 200 rotates by an electrical interaction with the stator 300. The rotor 200 can be disposed inside the stator 300 in correspondence with the stator 300. The rotor 200 can include a rotor core 210 and a magnet 220.

[0052] The stator 300 is disposed outside the rotor 200. The stator 300 can 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 is disposed between the coil 330 and the stator core 310, and electrically insulates the stator core 310 from the coil 330.

[0053] The lock portion 400 is disposed on the housing 500. The lock portion 400 is a portion that implements a parking brake function by restricting the rotation of the shaft 100 when the vehicle is stopped and a signal is applied to the lock portion 400. The lock portion 400 can be connected to the connector 10. The lock portion 400 can be disposed outside the housing 500. The lock portion 400 can be disposed to overlap the rotor 200 or the stator 300 in an axial direction. Also, the lock portion 400 can be disposed to overlap the bearing B in a radial direction.

[0054] The housing 500 is disposed outside the stator 300. The housing 500 can include a housing body 510 formed in a cylindrical shape, and a cover 520 covering the housing body 510.

[0055] The rotation portion 600 is coupled to the shaft 100. The rotation portion 600 is disposed outside the housing 500. The rotation portion 600 rotates integrally with the shaft 100 when the shaft 100 rotates. The rotation portion 600 can be disposed directly above the bearing B. The rotation portion 600 is coupled to the lock portion 400 in a concave-convex manner, and functions to selectively restrict the shaft 100 according to the position of the stopper 410 of the lock portion 400. The rotation portion 600 is disposed to overlap the rotor 200 in an axial direction.

[0056] Figure 4 is an exploded view illustrating the lock portion 400, Figure 5 is a plan view illustrating Figure 3 the stopper 410 illustrated in FIG. 6, and Figure 6 is a side cross-sectional view illustrating the lock portion 400.

[0057] Referring to Figures 4 to 6 , the lock portion 400 can include a stopper 410, a cylinder 420, a coil 430, and an elastic member 440.

[0058] A stopper 410 is disposed inside the cylinder 420. The cylinder 420 can be a cylindrical member in which a hollow is formed. A coil 430 can be disposed in the cylinder 420. The stopper 410 is disposed in the cylinder 420 and linearly reciprocates. In the stopper 410, a contact area with the rotating part 600 is formed so that the stopper 410 moves in the axial direction to prevent the shaft 100 from rotating.

[0059] The stopper 410 includes a protrusion P at a front end thereof. In the protrusion P, a contact area with the shaft 100 is formed so that the protrusion P is inserted into the groove portion G of the rotating part 600 to prevent the shaft 100 from rotating.

[0060] The protrusion P can include a third contact surface C3 and a fourth contact surface C4. The third contact surface C3 can be in contact with the first contact surface C1 (see Figure 11 ) of the groove portion G. The fourth contact surface C4 can be in contact with the second contact surface C2 (see Figure 11 ) of the groove portion G. The third contact surface C3 and the fourth contact surface C4 can be disposed to be inclined toward each other in a direction perpendicular to the axial direction.

[0061] The protrusion P of the stopper 410 can be formed in a linear shape in the longitudinal direction of the stopper 410.

[0062] The stopper 410 can be disposed to overlap the stator 200 in the axial direction. The stopper 410 can be disposed to overlap the bearing B in the radial direction.

[0063] The stopper 410 can be formed of a metal material.

[0064] An elastic member 440 can be disposed between the cylinder 420 and the stopper 410 in the axial direction. The elastic member 400 can be a spring having a restoring force when stretched.

[0065] Figure 7 FIG. 1 is a view showing a shaft 100 to which a rotating part 600 is coupled, and Figure 8 FIG. 8 is a view showing a rotating part 800.

[0066] Referring to Figure 7 and Figure 8 , the rotating part 600 can be a member formed in a disc shape. The rotating part 600 can include a hole H through which the shaft 100 passes. The hole H can be disposed in a central portion of the rotating part 600. In addition, the rotating part 600 can include a plurality of groove portions G. The groove portions G can be formed to be recessed inward from an edge of the rotating part 600. The plurality of groove portions G can be disposed at predetermined distances along the edge of the rotating part 600.

[0067] Figure 9 FIG. 5 is a view showing a 520 cover of a housing 500.

[0068] Referring to Figure 9 , the housing 500 can include a receiving portion 521 that receives the locking portion 400. The locking portion 400 is positioned inside the receiving portion 521. In addition, the housing 500 can include a bearing recess portion 522 that receives the bearing B. The receiving portion 521 can be disposed adjacent to the bearing recess portion 522.

[0069] Figure 10 is a view illustrating the shaft 100 unlocked in a state in which no current is applied to the locking portion 400, and Figure 11 is a view illustrating the positions of the groove portion G and the protrusion P in a state in which the shaft 100 is unlocked.

[0070] Referring to Figure 10 and Figure 11 , when the vehicle is traveling or stopping and no additional signal is input, no power is applied to the coil 430, and the protrusion P of the stopper 410 is positioned to be spaced apart from the groove portion G in the axial direction due to the restoring force of the elastic member 440. The shaft 100 is not restricted by the stopper 410 and rotates due to the electromagnetic interaction between the rotor 200 and the stator 300.

[0071] The groove portion G can include a first contact surface C1 and a second contact surface C2 that contact the protrusion P. The first contact surface C1 and the second contact surface C2 are disposed to face each other. The protrusion P is positioned between the first contact surface C1 and the second contact surface C2. The first contact surface C1 and the second contact surface C2 can be disposed to be inclined toward each other to increase a separation distance toward the entrance of the groove portion G.

[0072] The groove portion G can be disposed to overlap the rotor 200 in the axial direction.

[0073] Figure 12 is a view illustrating the shaft 100 restricted by the stopper 410 when power is applied to the locking portion 400, and Figure 13 is a view illustrating the protrusion P coupled to the groove portion G.

[0074] Referring to Figure 12 and Figure 13 , when the vehicle is in a parking state and a relevant signal is input to the parking brake to apply power to the coil 430, the stopper 410 moves linearly along the first cylinder 420 due to the electromagnetic interaction between the coil 430 and the stopper 410. The stopper 410 overcomes the restoring force of the first elastic member 440 and moves linearly toward the groove portion G. The stopper 410 moves until the protrusion P of the stopper 410 is completely inserted into the groove portion G. A portion of the protrusion P overlaps the groove portion G in the circumferential direction.

[0075] The protrusion P is inserted into the groove portion G, and a contact area is formed between the rotating portion 600 and the stopper 410 to prevent the rotating portion 600 from rotating. That is, the first contact surface C1 is in contact with the third contact surface C3, the second contact surface C2 is in contact with the fourth contact surface C4, and thus the rotation of the shaft 100 is restricted by the stopper 410.

[0076] As described above, since the stopper 410 directly restricts the shaft 100, there is an advantage that the parking brake function can be implemented without forming a separate parking brake.

[0077] A motor according to one exemplary embodiment of the present application has been described above with reference to the accompanying drawings.

[0078] The above-described embodiments should be considered in a descriptive sense only and not for purposes of limitation. The scope of the present application is defined by the appended claims rather than being circumscribed by the detailed description. Additionally, it should be understood that the scope of the present application encompasses all modifications and variations of the preferred embodiments that can become apparent to those skilled in the art, in light of the above teachings, without departing from the scope of the present application. Accordingly, the application is not to be restricted except in the spirit of the claims that follow.

Claims

1. A motor, comprising: axis; A rotor connected to the shaft; The stator is configured to correspond to the rotor; The rotating part is fixed to the shaft; as well as A locking portion is configured to be spaced apart from the shaft in the radial direction. The locking part includes a stop that can move toward the rotating part, and When a signal is applied to the locking part, the stop engages with the rotating part in a concave-convex manner to restrict the rotation of the shaft.

2. The motor according to claim 1, wherein, The rotating part and the locking part overlap in the circumferential direction.

3. The motor according to claim 1, wherein, The stop moves in the axial direction and is connected to the rotating part in the aforementioned concave-convex manner.

4. The motor according to claim 3, wherein: The rotating part includes multiple grooved portions; and The stop is inserted into one of the recessed portions of the groove.

5. The motor according to claim 1, wherein, At least a portion of the stop overlaps with the groove portion in the axial direction.

6. The motor according to claim 4, wherein, The groove portions are formed at predetermined intervals to recess inward from the edge of the rotating part.

7. The motor according to claim 4, wherein, At least a portion of the inner surface of the groove that contacts the protrusion is formed to be inclined.

8. The motor according to claim 1, wherein, The stop overlaps with the stator in the axial direction.

9. The motor according to claim 1, wherein, The locking part includes: A cylinder disposed outside the stop; and A coil is disposed in the cylinder.

10. The motor according to claim 9, wherein, The locking part also includes an elastic member disposed between the cylinder and the stop.

11. The motor according to claim 1, further comprising: A body that houses the stator and the rotor, and a portion of which is open; as well as The cover that covers the main body The cover includes a receiving portion for accommodating the locking portion.

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