Motor

Abstract

The present invention can provide a motor comprising: a shaft; a rotor coupled to the shaft; a stator disposed to correspond to the rotor; and a locking part disposed inside the shaft, wherein the locking part comprises a stopper movable in an axial direction, and when a signal is applied to the locking part, the stopper engages with the shaft through a projection-recess coupling to restrict the rotation of the shaft.

Description

motor

[0001] The present invention relates to a motor.

[0002] The electronic brake system of a vehicle is a device that brakes the vehicle by the operation of a motor and a reducer. Compared to a mechanical brake system, it is lighter and has excellent responsiveness, and has the advantage of being less restricted in installation space. It is a device that operates automatically using an actuator according to the vehicle's operating status without the driver manually operating it.

[0003] The electronic braking system may include an electric parking brake function. This parking brake function may be implemented by a configuration in which the braking force is secured by expanding the shoe inside the DIH (Drum In Hat) of the wheel with tension generated by pulling the parking cable through the rotation of the motor, or by the rotation of the motor causing the spindle to advance the piston and push the pad, thereby bringing the disc and the pad into close contact and securing the braking force.

[0004] However, in order to add a parking brake function to an electronic braking device, a separate configuration must be added, which requires a lot of installation space and complicates the configuration of related parts such as a reducer.

[0005] Accordingly, the purpose of the present invention is to provide a motor that can add a parking brake function to an electronic braking device with a relatively simple configuration.

[0006] The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the description below.

[0007] The embodiment may provide a motor including a shaft, a rotor coupled to the shaft, a stator arranged corresponding to the rotor, and a locking part arranged inside the shaft, wherein the locking part includes a stopper movable in the axial direction, and when a signal is applied to the locking part, the stopper engages with the shaft in a protruding manner to restrict rotation of the shaft.

[0008] The shaft may include a groove therein, and the stopper may include a protrusion having a shape corresponding to the groove.

[0009] The locking member may include a housing disposed inside the shaft, a stopper disposed inside the housing and in contact with the inner surface of the shaft, a cylinder disposed outside the stopper, a coil disposed outside the stopper, and an elastic member disposed between the stopper and the inner wall of the housing.

[0010] The above stopper moves in a straight line by the electromagnetic force generated from the coil,

[0011] When current is applied to the coil, the stopper moves so that the protrusion is inserted into the groove, thereby allowing the stopper to restrict rotation of the shaft.

[0012] The shaft includes a first region and a second region connected to the first region,

[0013] The second region includes a hollow portion, and the locking member can be positioned in the hollow portion.

[0014] The outer diameter of the second region may be larger than the outer diameter of the first region.

[0015] At least a portion of the locking member may be arranged to overlap the rotor and the stator in the radial direction.

[0016] The shaft includes a first wall and a second wall forming a hollow portion, the first wall being arranged radially opposite the locking portion, the second wall being arranged axially opposite the locking portion, and the groove being arranged in the second wall.

[0017] The above protrusion can form a contact area so as to be restrained in the rotational direction of the shaft.

[0018] The above groove may include a first contact surface and a second contact surface, and the first contact surface and the second contact surface may be formed to form an angle when viewed in the axial direction.

[0019] The groove includes a third contact surface and a fourth contact surface, and the third contact surface and the fourth contact surface are formed to form an angle when viewed in the axial direction, and the first contact surface and the third contact surface are in contact, and the second contact surface and the fourth contact surface are in contact, so that the protrusion can restrain the rotation of the shaft.

[0020] The above home can be arranged to overlap radially with the insulation of the stator.

[0021] The stopper includes a first part in which the protrusion is formed, and a second part in contact with the first part, and when current is applied to the coil, the second part moves upward, and the first part moves upward in conjunction with the upward movement of the second part, but a part of the first part can be caught by the second part while the protrusion is inserted into the groove to restrict the rotation of the shaft.

[0022] According to one embodiment of the present invention, a parking brake function is added to an electronic braking device, which has the advantage of simplifying the configuration of the entire braking device.

[0023] According to one embodiment of the present invention, by directly restraining the shaft of the motor of the electronic braking device, there is no need for a separate parking brake configuration, thereby reducing the installation space and the number of parts.

[0024] According to one embodiment of the present invention, there is an advantage in that the size of a configuration for implementing a parking brake function is minimized by arranging the stopper to overlap the shaft in the axial direction.

[0025] According to one embodiment of the present invention, there is an advantage in that the axial length of the motor can be reduced by forming a locking member inside the shaft.

[0026] Figure 1 is a drawing showing a motor according to an embodiment;

[0027] Fig. 2 is an exploded view of the motor shown in Fig. 1;

[0028] Figure 3 is a perspective view showing a shaft;

[0029] Figure 4 is a drawing showing a home.

[0030] Figure 5 is a drawing showing a locking part;

[0031] Fig. 6 is an exploded view of the locking part shown in Fig. 5;

[0032] Fig. 7 is a side cross-sectional view of the locking part illustrated in Fig. 5.

[0033] Figure 8 is a drawing showing a shaft and a locking part;

[0034] Figure 9 is a drawing showing the first part of the stopper;

[0035] Figure 10 is a drawing showing a cylinder,

[0036] Fig. 11 is a drawing showing the second part of the stopper,

[0037] Figure 12 is a drawing showing a wire,

[0038] Figure 13 is a drawing showing the state of the stopper when no current is applied to the locking part.

[0039] Figure 14 is a drawing showing a state in which the stopper moves while current is applied to the locking part.

[0040] Figure 15 is a drawing showing a state in which the shaft is restrained by a lock.

[0041] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0042] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0043] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0044] Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0045] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0046] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0047] These terms are intended only to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the component.

[0048] And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

[0049] Additionally, when described as being formed or arranged "above or below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below," it can include the meaning of a downward direction as well as an upward direction based on one component.

[0050] Fig. 1 is a drawing showing a motor according to an embodiment, and Fig. 2 is an exploded view of the motor shown in Fig. 1.

[0051] Referring to FIGS. 1 and 2, a motor according to an embodiment may include a shaft (100), a rotor (200), a stator (300), a locking member (400), and a housing (500).

[0052] Hereinafter, the inner side means the direction arranged toward the shaft (100) based on the radial direction of the motor, and the outer side means the direction opposite to the inner side. And hereafter, the circumferential direction and the radial direction are based on the axis center of the motor.

[0053] Below, the motor has the characteristic of having a parking brake function in addition to the vehicle's braking function.

[0054] The shaft (100) can be rotatably supported in the axial direction by bearings (B) at both ends of the shaft (100). The shaft (100) can be arranged so that parts with different outer diameters are separated along the axial direction.

[0055] The rotor (200) rotates through electromagnetic interaction with the stator (300). The rotor (200) may be arranged in correspondence with the stator (300) and may be arranged inside the stator (300). The rotor (200) may include a magnet.

[0056] The stator (300) is disposed on the outside of 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) may be wound around the insulator (320). The insulator (320) is disposed between the coil (330) and the stator core (310), thereby electrically insulating the stator core (310) and the coil (330) from each other. The coil (330) induces an electromagnetic interaction with the magnet (220) of the rotor (200).

[0057] The locking member (400) is positioned inside the shaft (100). The locking member (400) is a device that implements a parking brake function by restraining the shaft (100) from rotating when a signal is applied when the vehicle is stopped. The locking member (400) is connected to a connector (10).

[0058] The housing (500) is placed on the outside of the stator (300).

[0059] Figure 3 is a side cross-sectional view of a shaft (100).

[0060] Referring to FIG. 3, the shaft (100) can be divided into a first region (110) and a second region (120) in the axial direction.

[0061] The outer diameter (D2) of the second region (120) may be larger than the outer diameter (D1) of the first region (110). The second region (120) may include a hollow (101) therein. The hollow (101) is formed along the axial direction. One end of the second region (120) is open due to the hollow (101). The locking portion (400) is located in the hollow (101). A portion of the second region (120) may be arranged to overlap the rotor (200) and the stator (300) in the radial direction.

[0062] The first region (110) can be rotatably supported by a bearing.

[0063] The second region (120) includes a first wall (W1) and a second wall (W2) forming a hollow (101). The first wall (W1) is arranged along the axial direction and radially facing the locking portion (400). The second wall (W2) is arranged perpendicular to the first wall (W1) and axially facing the locking portion (400).

[0064] Meanwhile, the second region (120) includes a groove (G). The groove (G) is formed concavely in the second wall (W2). The groove (G) is for engagement with the stopper (410) of the locking portion (400).

[0065] Figure 4 is a drawing showing a home (G).

[0066] Referring to FIG. 4, the groove (G) may have a shape corresponding to the projection (P) of the stopper (410) so as to be interlocked with the projection (P) and to be mutually restrained in the rotational direction of the shaft (100). For example, the groove (G) may have a hexagonal shape when viewed in the axial direction. The groove (G) may be located at the center of the second wall (W2).

[0067] The groove (G) may include a third contact surface (CT3) and a fourth contact surface (CT4) that come into contact with the projection (P). The third contact surface (CT3) and the fourth contact surface (CT4) are arranged to be inclined so as to form an edge when viewed in the axial direction. The first contact surface (CT1) of the projection (P) comes into contact with the third contact surface (CT3) of the groove (G), and the second contact surface (CT2) of the projection (P) comes into contact with the fourth contact surface (CT4) of the groove (G), so that the projection (P) restrains the shaft (100). The groove (G) may be arranged to overlap in the radial direction of the insulator (320) of the stator (300).

[0068] Fig. 5 is a drawing illustrating a locking part (400), Fig. 6 is an exploded view of the locking part (400) illustrated in Fig. 5, and Fig. 7 is a side cross-sectional view of the locking part (400) illustrated in Fig. 5.

[0069] Referring to FIGS. 5 to 7, the locking part (400) may include a stopper (410), a cylinder (420), a coil (430), an elastic member (440), a case (450), and a cover (460).

[0070] The stopper (410) may include a first part (411) and a second part (412). The first part (411) is axially laminated to the second part (412). When the second part (412) moves, the first part (411) is configured to move in conjunction therewith. The first part (411) includes a protrusion (P). The second part (412) electromagnetically interacts with the coil (430) to move linearly along the inside of the cylinder (420).

[0071] The cylinder (420) is placed inside the case (450).

[0072] The coil (430) is placed inside the case (450) and can be placed on one side of the cylinder (420). The coil (430) is connected to an external connector.

[0073] An elastic member (440) is axially arranged between the inner wall of the case (450) and the first part (411). The elastic member (440) may be a coil spring having a restoring force when stretched. Due to the restoring force of the elastic member (440), the first part (411) is maintained in a state away from the shaft (100).

[0074] The case (450) may be a cylindrical member forming an accommodation space therein. The case (450) may include a cover (460) covering the open upper portion.

[0075] The cover (460) may include a hole (H) through which a protrusion (P) emerges.

[0076] Figure 8 is a drawing showing a shaft (100) and a locking part (400).

[0077] Referring to FIG. 8, the shaft (100) may include a groove (G).

[0078] The stopper (410) may include a protrusion (P) formed on the first part (411). As the stopper (410) of the locking part (400) moves along the axial direction and the protrusion (P) is inserted into the groove (G), the shaft (100) is restrained by the stopper (410) and does not rotate.

[0079] Fig. 9 is a drawing showing a first part (411) of a stopper (410), and Fig. 10 is a drawing showing a cylinder (420).

[0080] Referring to FIGS. 9 and 10, the first part (411) may include a cylindrical body (411a) and a plurality of wing portions (411b) protruding from the outer surface of the body (411a). An elastic member (440) is mounted on one side of the wing portion (411b). The wing portion (411b) may include a first surface (411c) disposed on the other side. The first surface (411c) is a surface that contacts a second surface (451) disposed on one end of the cylinder (420) or one side of the second part (412). The first surface (411c) may be formed to be inclined.

[0081] The cylinder (420) includes a second surface (451) on one end. It may be arranged to be inclined relative to the first surface (411c), but may be implemented to form a step (ST). The cylinder (420) may include a plurality of slots (SL) formed along the axial direction. The wing portion (412b) of the stopper (410) may move along the slots (SL).

[0082] Fig. 11 is a drawing showing the second part (412) of the stopper (410).

[0083] Referring to FIG. 11, the second part (412) of the stopper (410) may include a cylindrical body (412a) and a plurality of wing portions (412b) protruding from the outer surface of the body (412a). The wing portions (411b) may include a third surface (C3) and a fourth surface (C4) arranged on the other side. The third surface (C3) and the fourth surface (C4) may be arranged to be inclined so as to form a corner.

[0084] The third side (C3) or the fourth side (C4) is in contact with the first side (411c) of the first part (411).

[0085] Figure 12 is a drawing illustrating a wire (480).

[0086] Referring to FIG. 12, the locking part (400) is connected to a wire (480) and can receive power and send and receive control signals through the wire (480).

[0087] The wire (480) is guided along the cover (510) and axially secured by the wire holder (490). The wire (480) is connected to the connector (20).

[0088] The wire holder (490) is arranged along the axial direction. The wire holder (490) may be arranged at the edge of the cover (510). The wire holder (490) may be an injection-molded molded product. The plate (470) is in contact with the cover (510).

[0089] A portion of the plate (470) is placed apart from the cover (510). This is to secure space for the wire (480).

[0090] Fig. 13 is a drawing showing the state of the stopper (410) when no current is applied to the locking part (400).

[0091] As illustrated in Fig. 13, when the vehicle is running or stopped and there is no separate signal, power is not supplied to the coil (430), and the protrusion (P) of the stopper (410) is positioned apart from the groove (G) by the restoring force of the elastic member (440). The shaft (100) is not restrained by the stopper (410) and rotates due to the electromagnetic interaction between the rotor (200) and the stator (300).

[0092] Fig. 14 is a drawing showing a state in which a stopper (410) moves while current is applied to a locking part (400).

[0093] As illustrated in Fig. 14, when the vehicle is in a parked state and a signal related to the parking brake is input and power is applied to the coil (430), the second part (412) of the stopper (410) moves linearly along the cylinder (420) due to the electromagnetic interaction between the coil (430) and the stopper (410). The second part (412) of the stopper (410) moves linearly toward the shaft (100) while overcoming the restoring force of the elastic member (440). When the second part (412) moves, the first part (411) moves toward the shaft (100) by the second part (412) while one side of the second part (412) is in contact with the first surface (411c) of the first part (411). At this time, since the first surface (411c) of the first part (411) and the contact surface of the second part (412) are arranged at an angle, the first part (411) rotates and moves toward the shaft (100). Then, with the groove (G) and the protrusion (P) aligned, the protrusion (P) is inserted into the groove (G).

[0094] Figure 15 is a drawing showing a state in which a shaft (100) is restrained by a locking member (400).

[0095] Referring to Fig. 15, when the current supplied to the coil (430) is released, the second part (412) moves away from the shaft (100), causing the first part (411) to move, so that the first surface (411c) of the first part (411) is caught on the step (ST) of the cylinder (420). Since the cylinder (420) is fixed in the rotational direction, the first part (411) is fixed to the cylinder (420) in the rotational direction. As a result, the shaft (100) is restrained to the first part (411) while the protrusion (P) is inserted into the groove (G), thereby preventing rotation and performing a parking brake function.

[0096] Such a locking part (400) has the advantage that, even if the current supplied to the coil (430) is released, there is no need to continuously supply power to the locking part (400) to perform the parking brake function because the first part (411) is caught on the step (ST).

[0097] When releasing the restraint of the shaft (100), when current is applied to the coil (430) again, the second part (412) of the stopper (410) moves in a straight line toward the shaft (100) while overcoming the restoring force of the elastic member (440), and lifts the first part (411), thereby separating the first part (411) from the cylinder (420). At this time, as the first part (411) rotates, the wing part (411b) of the first part (411) is aligned with the gap of the cylinder (420). Then, when the current application to the coil (430) is released, the first part (411) descends, the protrusion (P) comes out of the groove (G), and the stopper (410) is released from the shaft (100), thereby releasing the restraint of the shaft (100).

[0098] The above-described embodiment is an exemplary embodiment in which the stopper (410) moves by the electromagnetic interaction between the coil (430) and the stopper (410), and this may be, for example, a solenoid structure. However, the present invention is not limited to the above-described exemplary embodiment, and other configurations in which the stopper (410) can repeat linear movement, such as a structure in which the stopper (410) moves by utilizing the shape deformation of a shape memory alloy, may be applied or modified.

[0099] Above, a motor according to a preferred embodiment of the present invention has been specifically examined with reference to the attached drawings.

[0100] It should be understood that the above-described embodiments of the present invention are illustrative in all respects and not restrictive. The scope of the present invention will be determined by the claims that follow, rather than by the detailed description set forth above. Furthermore, the meaning and scope of these claims, as well as all possible modifications or variations derived from their equivalent concepts, should be construed as encompassing the scope of the present invention.

Claims

1. Shaft; A rotor coupled to the above shaft; a stator arranged corresponding to the rotor; and Includes a locking part arranged inside the above shaft, The above locking member comprises a stopper movable in the axial direction, A motor that, when a signal is applied to the above locking part, the stopper engages with the shaft to restrict rotation of the shaft.

2. In paragraph 1, The above shaft includes a groove inside, The above stopper is a motor including a protrusion having a shape corresponding to the above groove.

3. In paragraph 2, A motor including a housing arranged inside the shaft, a stopper arranged inside the housing and in contact with the inner surface of the shaft, a cylinder arranged outside the stopper, a coil arranged outside the stopper, and an elastic member arranged between the stopper and the inner wall of the housing.

4. In paragraph 3, The above stopper moves in a straight line by the electromagnetic force generated from the coil, A motor in which, when current is applied to the coil, the stopper moves so that the projection is inserted into the groove, thereby restricting the rotation of the shaft.

5. In paragraph 1, The shaft comprises a first region and a second region connected to the first region, The above second region comprises a hollow space, The above locking part is a motor placed in the hollow space.

6. In paragraph 1, A motor in which the outer diameter of the second region is larger than the outer diameter of the first region.

7. In paragraph 2, A motor wherein at least a portion of the locking portion is arranged to overlap the rotor and the stator in the radial direction.

8. In paragraph 2, Including a first wall and a second wall forming a hollow portion of the shaft, The above first wall is arranged radially opposite the locking portion, The second wall is positioned axially opposite the locking portion, The above home is a motor placed on the second wall.

9. In paragraph 8, A motor in which the above projection forms a contact area so as to be restrained in the rotational direction of the shaft.

10. In the second paragraph, The above projection includes a first contact surface and a second contact surface, A motor in which the first contact surface and the second contact surface are formed to form an angle when viewed in the axial direction.

11. In clause 10, The above home includes a third contact surface and a fourth contact surface, The third contact surface and the fourth contact surface are formed to form an angle when viewed in the axial direction, A motor in which the first contact surface and the third contact surface are in contact, and the second contact surface and the fourth contact surface are in contact, so that the projection restricts the rotation of the shaft.

12. In paragraph 2, A motor in which the above-mentioned home is arranged to radially overlap with the insulation of the above-mentioned stator.

13. In paragraph 2, The stopper comprises a first part in which the projection is formed, and a second part in contact with the first part, When current is applied to the coil, the second part moves upward, and the first part moves upward in conjunction with the upward movement of the second part. A motor in which a part of the first part is caught on the second part while the protrusion is inserted into the groove and the rotation of the shaft is restricted.

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