Motors for car seat slides

Abstract

The present invention relates to a motor for a car seat sliding device, comprising a coil module in which a plurality of first coils and a second coil are arranged in a cylindrical shape in a seamless manner along a circumferential direction. Thus, it is not necessary to use an existing stator core having slots and teeth for arranging the coils, so that the motor can be miniaturized and lightweight, and since there are no slots and teeth, the cogging torque can be reduced, thereby reducing the vibration and noise of the motor.

Description

Technical Field

[0001] The present invention relates to a motor for a sliding device of a car seat, and more particularly to a motor which is arranged on a sliding track of the seat and is used for slidingly moving the car seat in a forward and backward direction. Background Art

[0002] Typically, a car seat is arranged to be movable in a front-rear direction so that a passenger can adjust the seat according to the body condition.

[0003] The seat is mounted on the bottom plate via a sliding track, the lower track of the sliding track is fixed to the bottom plate, and the seat is fixed to the upper track. Inside the sliding track, a lead screw is fixed to the lower track, and a hollow motor is fixed to the upper track. The hollow motor has a nut screwed with the lead screw. The lead screw is set in a state of penetrating the inside of the motor.

[0004] Therefore, when the motor is working, the motor moves toward the front-rear direction of the lead screw according to its rotation direction, thereby moving the upper rail on which the motor is installed, thereby enabling the seat set on the upper rail to move in the front-rear direction and adjust its position.

[0005] Figure 1 and Figure 2 A motor of a seat slide device according to the related art and a cross-sectional view thereof are respectively shown.

[0006] The motor of the seat slide device is a brushless DC motor, in which the stator core 2 is fixedly disposed inside the housing 1 , and the rotor sleeve 4 is rotatably disposed inside the stator core 2 .

[0007] Slots 2a are formed in the stator core 2 at predetermined intervals along the circumferential direction, and the coils 3 are wound around teeth 2b between the slots 2a.

[0008] A cylindrical permanent magnet 5 having N poles and S poles repeatedly magnetized in the circumferential direction is disposed on the outer circumferential surface of the rotor sleeve 4, and a nut 6 is disposed on the inner circumferential surface.

[0009] Therefore, when the polarity of the magnetic field formed by the plurality of coils 3 arranged in the stator core 2 along the circumferential direction is sequentially changed by controlling the current supply, the rotor sleeve 4 continues to rotate due to the magnetic force relationship with the permanent magnets 5 .

[0010] Thus, the rotor sleeve 4 moves along the lead screw. This means that the motor moves along the lead screw, and as a result, the seat can move in the forward and backward directions, thereby adjusting its position.

[0011] On the other hand, the conventional motor as described above has a problem in that the slots 2 a and teeth 2 b formed to set the coils 3 in the stator core 2 may increase the size of the stator core 2, thereby increasing the size and weight of the entire motor.

[0012] Furthermore, since the slots 2a and the teeth 2b are formed at a predetermined interval along the circumferential direction, a cogging torque is generated, and the torque ripple generated thereby increases the vibration and noise of the motor.

[0013] Prior art literature

[0014] Patent Literature

[0015] Korean Patent Gazette No. 10-1991256 (June 21, 2019) Summary of the invention

[0016] Technical issues

[0017] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a motor for a car seat sliding device that reduces noise and vibration by being downsized and lightened.

[0018] Technical Solution

[0019] In order to achieve the above-mentioned purpose, the present invention includes: a back yoke; a coil module, which is inserted into the above-mentioned back yoke and supported by the above-mentioned back yoke, and is composed of a plurality of first coils and second coils that form a cylindrical shape in an assembled state; a rotor sleeve, which is inserted into the inner side of the above-mentioned coil module in a rotatable state; a permanent magnet, which is arranged on the outer peripheral surface of the above-mentioned rotor sleeve and forms multiple poles along the circumferential direction; and a nut, which is arranged inside the above-mentioned rotor sleeve.

[0020] The first coil and the second coil have a shape of a cylinder divided body obtained by dividing the cylinder at a predetermined interval in the circumferential direction.

[0021] The first coil and the second coil include: a main body, which is composed of two straight line parts parallel to each other; and ends, which are respectively connected to the two ends of the main body, and a pair of terminals are protruded at one end (starting end). The interior of the main body has a rectangular ring shape forming a linear through hole.

[0022] The first coil and the second coil are arranged continuously along the circumferential direction, and one side body of the adjacent coil is inserted into the through hole of one coil, so that the bodies of the plurality of coils are continuously present without gaps along the circumferential direction of the coil module.

[0023] Relative to the main body, the starting end of the first coil on both sides forms a height difference along the outer side in the radial direction, and relative to its own main body, the other end of the second coil on both sides opposite to the starting end forms a height difference along the inner side in the radial direction.

[0024] In the first coil and the second coil, a coil body composed of a conductor is formed by insert injection, thereby forming a plastic coating layer on the surface of the coil body.

[0025] The circuit board is in the shape of a disk with a circular through hole formed inside, a plurality of terminal grooves for inserting the first coil terminals are formed on the inner peripheral surface, and a plurality of terminal grooves for inserting the second coil terminals are formed on the outer peripheral surface.

[0026] Effects of the Invention

[0027] The present invention as described above has the effect of reducing the size and weight of the motor because it is not necessary to use the conventional stator core in which slots and teeth are formed.

[0028] Furthermore, the motor can be miniaturized and lightened by applying a coil module having a compact structure.

[0029] Furthermore, since the slots and teeth described above are not used, the cogging torque and torque pulsation can be reduced, thereby reducing the vibration and noise of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a perspective view showing a motor for a vehicle seat sliding device according to the prior art.

[0031] Figure 2 The figure shows a side cross-sectional view of a motor according to the prior art.

[0032] Figure 3 The present invention is a perspective view of a motor for a vehicle seat sliding device.

[0033] Figure 4 A front cross-sectional view showing a motor of the present invention ( Figure 3 AA line section view).

[0034] Figure 5 A side sectional view showing the motor of the present invention ( Figure 3 BB line cross-sectional view).

[0035] Figure 6 The figure is an exploded perspective view showing the motor of the present invention.

[0036] Figure 7 FIG. 1 is a perspective view showing a coil module as one structure of the present invention.

[0037] Figure 8To show in Figure 7 A three-dimensional diagram of a coil module in a state where a second coil is removed.

[0038] Fig. 9 FIG. 1 is a diagram showing a first coil as one structure of the coil module.

[0039] Fig.10 FIG. 1 is a diagram showing a second coil as one structure of the coil module.

[0040] Fig.11 Shown from the starting end side Figure 7 A three-dimensional diagram of a coil module.

[0041] Fig.12 From the other end side Figure 7 A three-dimensional diagram of a coil module.

[0042] Fig.13 It is a front view showing a circuit board which is one structure of the present invention.

[0043] Description of Reference Numerals

[0044] 10: Back yoke 20: Coil module

[0045] 21: First coil 22: Second coil

[0046] 21A, 22A: Coil body 21B, 22B: Coating layer

[0047] 21a, 22a: Main body 21b, 22b: Starting end

[0048] 21c, 22c: other end 21d, 22d: terminal

[0049] 30: rotor sleeve 40: permanent magnet

[0050] 50: Nut 60: Circuit board

[0051] 70: housing 80, 81: cover

[0052] 90: Bearing A: Air gap DETAILED DESCRIPTION

[0053] The present invention can be modified in many ways and has many embodiments. Hereinafter, a plurality of specific embodiments will be described in detail by way of examples in the accompanying drawings. However, the specific embodiments of the present invention are not limited thereto, and should be understood to include all modifications, equivalent technical solutions, and alternative technical solutions that belong to the concept and technical scope of the present invention. For the sake of clarity and convenience in explanation, the thickness of the plurality of lines or the size of the structural elements illustrated in the accompanying drawings are enlarged and shown below.

[0054] Furthermore, the following terms are defined in consideration of their functions in the present invention and may be changed by the intention of the user or operator or by precedent. Therefore, the definition of such terms should be determined based on the overall content of this specification.

[0055] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0056] like Figures 3 to 6 As shown, the motor for a vehicle seat sliding device of the present invention includes a back yoke 10 , a coil module 20 , a rotor sleeve 30 , a permanent magnet 40 , and a nut 50 .

[0057] The back yoke 10 is a cylindrical member and is supported so as to surround the outer periphery of the coil module 20. A cylindrical housing 70 forming the outer appearance of the motor is provided on the outer periphery of the back yoke 10.

[0058] The coil module 20 is assembled by a plurality of first coils 21 and a plurality of second coils 22 to form a cylindrical structure, and forms a magnetic field by supplying electricity, thereby rotating the rotor sleeve 30 mounted on the permanent magnet 40. The coil module 20 will be described in further detail later.

[0059] The rotor sleeve 30 is a cylindrical hollow bearing, which is inserted into the inner space of the coil module 20 , and is supported at both ends by bearings 90 , so that the rotor sleeve 30 can rotate in a set state.

[0060] The permanent magnet 40 is a cylindrical magnet, and N poles and S poles are repeatedly magnetized at predetermined intervals in the circumferential direction. Figure 5 A quadrupole magnet is shown as an example, in which two N poles and two S poles are formed in opposite directions.

[0061] The permanent magnet 40 is fixed to the outer circumference of the rotor sleeve 30 , and there is an air gap A between the outer circumference of the permanent magnet 40 and the inner circumference of the coil module 20 , thereby allowing the permanent magnet 40 and the rotor sleeve 30 to rotate smoothly relative to the fixed coil module 20 .

[0062] The nut 50 is a cylindrical internal thread formed on the inner circumference of the rotor sleeve 30 (it can also be installed on the inner circumference of the rotor sleeve 30 by making a separate object), and the nut 50 is threadedly connected to the lead screw provided on the lower rail of the seat slide rail.

[0063] Covers 80 and 81 are respectively provided at both ends of the housing 70 . The cover 80 and 81 expose only the two open ends of the rotor sleeve 30 to the outside and cover the remaining portion.

[0064] The bearings 90 that respectively support both ends of the rotor sleeve 30 are supported by the cover portions 80 and 81 on both sides.

[0065] On one side of the inner portion of the housing 70, the circuit board 60 is disposed between the cover 80 and the coil module 20. The circuit board 60 is in contact with the coil module 20, forms an electric supply circuit for controlling the coil module 20, and has terminals and wires (not shown) for connecting to an external power source of the motor.

[0066] Next, refer to Figures 7 to 12 , the coil module 20 as the main structure of the present invention is described in detail.

[0067] like Figure 7 As shown, the coil module 20 is composed of a plurality of first coils 21 and second coils 22, which form a cylindrical structure in the assembled state.

[0068] Figure 8 For Figure 7 The figure of the state where a second coil 22 is removed from the coil module is helpful to observe the assembly structure of the first coil 21 and the second coil 22. As shown in the figure, the first coil 21 and the second coil 22 are repeatedly arranged along the circumferential direction to form a cylinder as a whole.

[0069] like Fig. 9 and Fig.10 As shown, the first coil 21 and the second coil 22 have the shape of a cylinder segmented body obtained by cutting the cylinder at a predetermined interval along the circumferential direction. When viewed from a plane, they are roughly rectangular in shape, and when viewed from both sides, the ends are arc-shaped and can constitute a part of the cylinder.

[0070] The main bodies 21a and 22a of the first coil 21 and the second coil 22 are composed of two straight line parts parallel to each other, and end parts 21b, 21c, 22b, and 22c for connecting the two straight line parts are formed at both ends of the main bodies 21a and 22a. Therefore, a straight through hole is formed inside the first coil 21 and the second coil 22 along the length direction.

[0071] Also, at both side ends, a pair of terminals 21 d and 22 d may protrude from the start ends 21 b and 22 b connected to the circuit board 60 .

[0072] The coil bodies 21A and 22A of the above-mentioned shapes may be formed by insert injection molding, and plastic coating layers 21B and 22B may be formed on the surfaces of the coil bodies 21A and 22A to manufacture the first coil 21 and the second coil 22 .

[0073] That is, in Fig. 9 and Fig.10 In the figure, the reference numerals 21B and 22B shown by the dotted lines (double-dashed lines) represent coating layers formed on the surfaces of the coil bodies 21A and 22A, which can be used to understand the structure and manufacturing process of the first coil 21 and the second coil 22.

[0074] On the other hand, the first coil 21 and the second coil 22 are respectively arranged continuously along the circumferential direction, and the respective main bodies 21a, 22a are arranged in a mutually overlapping manner to form a cylindrical structure. In this case, in order to prevent the two side ends 21b, 21c, 22b, 22c of the first coil 21 and the second coil 22 from interfering with each other, the starting end 21b of the first coil 21 (the end that contacts the circuit board by forming terminals 21d, 22d) forms the same surface as the main body 21a, and the other end 21c is formed in a manner with a height difference along the inner side in the radial direction compared to the main body 21a, and the starting end 22b of the second coil 22 is formed in a manner with a height difference along the outer side in the radial direction compared to the main body 22a, and the other end 22c has a structure that forms the same surface as the main body 22a.

[0075] Therefore, if the first coil 21 and the second coil 22 are repeatedly arranged along the circumferential direction, the one side bodies 21a and 22a of two adjacent coils of the other type are inserted into the through-hole of the coil (one of the first coil and the second coil), thereby forming the same cylinder. That is, the one side bodies 22a of the two adjacent second coils 22 are inserted into the through-hole of the first coil 21, and the one side bodies 21a of the two adjacent first coils 21 are inserted into the through-hole of the second coil 22.

[0076] When the coil module assembled in the above manner is observed from both ends, both the starting end side and the other end side have a double structure, that is, the circumference formed by the ends 21b and 21c of the first coil 21 exists inside the circumference formed by the ends 22b and 22c of the second coil 22 ( Fig.11 To show the state of the starting end portions 21b and 22b, Fig.12 21c and 22c are shown in FIG.

[0077] However, when assembling the coil module 20, in order to prevent interference between the ends of the first coil 21 and the second coil 22, the ends of the first coil 21 and the second coil 22 can be formed only at the ends of both sides of the coil module 20 by forming a height difference in opposite directions, and the main bodies 21a and 22a occupying most of the area of ​​the coil module 20 can be arranged on the same circumference to form a layer (which can be Figure 5 (confirmed in).

[0078] As described above, in this case, since the main bodies of the other adjacent coils are respectively inserted into the through holes of the first coil 21 and the second coil 22, the coil module 20 passes through the entire circumferential direction so that the main bodies 21a and 22a exist without gaps. That is, the parts where there are no coils (conductors) along the circumferential direction of the motor in the prior art, for example, the teeth 2b formed between the slots 2a of the stator core 2, can be removed.

[0079] As mentioned above Fig.11 As shown, terminals 21 d and 22 d are formed to protrude from respective starting ends 21 b and 22 b of the first coil 21 and the second coil 22 , and these terminals 21 d and 22 d are in contact with the circuit board 60 to realize current supply.

[0080] like Fig.13 As shown, the circuit board 60 is in the shape of a circular plate, and has an outer peripheral surface and an inner peripheral surface with a circular through hole formed therein. A terminal groove 61 for the first coil is formed at a position corresponding to the terminal 21d of the first coil 21 on the inner peripheral surface of the circuit board 60, and a terminal groove 62 for the second coil is formed at a position corresponding to the terminal 22d of the second coil 22 on the outer peripheral surface.

[0081] Therefore, the terminals 21d and 22d of the first coil and the second coil are inserted and combined in the terminal grooves 61 and 62 corresponding to the circuit board 60 to realize the physical combination and electrical contact between the circuit board 60 and the coil module 20. In this case, the terminals 21d and 22d are inserted in a direction perpendicular to the plane formed by the circuit board 60.

[0082] Next, the effects of the motor used for the automotive seat sliding device according to the present invention will be described.

[0083] The power supply line connected to the outside of the motor is connected to the above-mentioned circuit board 60 inside the motor, and the plurality of first coils 21 and second coils 22 arranged along the circumferential direction are connected to the circuit board 60. Through the action of the control circuit arranged on the circuit board 60, the first coils 21 and second coils 22 can be sequentially turned on / off along the circumferential direction. In this case, the rotor sleeve 30 can rotate by the interaction of the magnetic field change and the magnetic force of the permanent magnet 40. Therefore, the nut 50 fixed to the inner side of the rotor sleeve 30 is moved by the lead screw arranged on the lower rail of the sliding track, so that the upper rail on which the motor is installed moves forward and backward, thereby adjusting the position of the seat in the forward and backward directions.

[0084] On the other hand, the motor of the present invention has a cylindrical coil module 20 formed by continuously circumferentially arranging a plurality of cylindrical segmented coils 21 and 22 , so that the coil module 20 can be surrounded by the thin cylindrical back yoke 10 to maintain the shape of the structure.

[0085] As described above, the motor of the present invention can surround the wire-shaped coil, so there is no need to use the existing stator core with multiple slots and teeth formed along the circumferential direction. Compared with the stator core with multiple slots and teeth formed above, the coil module 20 of the present invention is relatively small in size, so the size and weight of the motor can be reduced.

[0086] Furthermore, the first coil 21 and the second coil 22 constituting the coil module 20 are formed into a rectangular ring shape, and the opposite ends of the two ends form a height difference along the inner side of the circumferential direction in the first coil 21, and a height difference is formed along the outer side of the circumferential direction in the second coil 22, thereby, the main bodies 21a and 22a of the two coils can be continuously arranged in an overlapping manner along the circumferential direction. Since there is no space in the coil module 20 where the coil is not arranged along the circumferential direction, a smaller coil module 20 can be manufactured, which is conducive to the miniaturization and lightness of the motor.

[0087] Furthermore, as described above, the coil exists in a seamless manner along the circumferential direction of the coil module 20, and since there is no structure like the existing slots or teeth that generate cogging torque, the cogging torque of the motor can be reduced and the torque pulsation can be reduced, thereby having the effect of reducing the vibration and noise generated when the motor is working.

[0088] As described above, although the present invention is described with reference to the embodiments shown in the accompanying drawings, this is only an example, and it should be understood that a person skilled in the art of the present invention can derive various modifications and other embodiments of equivalent technical solutions. Therefore, the true technical protection scope of the present invention should be determined by the following invention claims.

Claims

1. A motor for a sliding device of a car seat, characterized in that: include: Back yoke; A coil module, inserted into and supported by the back yoke, comprising a plurality of first coils and a second coil that form a cylindrical shape in an assembled state; A rotor sleeve is inserted into the inner side of the coil module in a rotatable state; Permanent magnets are arranged on the outer peripheral surface of the rotor sleeve to form multiple poles along the circumferential direction; A nut, arranged inside the rotor sleeve; A housing, mounted on the outer side of the back yoke; Covers respectively mounted on both ends of the housing; as well as A circuit board is formed between the cover and the coil module, on which a circuit for controlling power supply to the coil module is formed, The motor for a car seat sliding device is characterized in that the first coil and the second coil have a cylindrical segmented body shape in which a cylinder is segmented at a predetermined interval along the circumferential direction. The motor for the sliding device of the automobile seat is characterized in that: The first coil and the second coil include: A main body consisting of two parallel straight sections; and The ends are connected to the two ends of the main body respectively, and a pair of terminals are formed at one end as the starting end. The interior of the main body has a rectangular ring shape forming a linear through hole. The motor for the sliding device of the automobile seat is characterized in that the first coil and the second coil are formed by insert injection molding to form a coil body composed of a conductor to form a plastic coating layer on the surface of the coil body. The motor for the automobile seat sliding device is characterized in that the circuit board is in the shape of a circular plate with a circular through hole formed inside, a plurality of terminal grooves for inserting the first coil terminal are formed on the inner peripheral surface, and a plurality of terminal grooves for inserting the second coil terminal are formed on the outer peripheral surface.

2. The motor for a vehicle seat sliding device according to claim 1, characterized in that: The first coil and the second coil are arranged continuously along the circumferential direction, and one side body of the adjacent coil is inserted into the through hole of one coil, so that the bodies of the plurality of coils are continuously present without gaps along the circumferential direction of the coil module.

3. The motor for a vehicle seat sliding device according to claim 2, characterized in that: Relative to the main body, the starting end of the first coil on both sides forms a height difference along the outer side in the radial direction, and relative to its own main body, the other end of the second coil on both sides opposite to the starting end forms a height difference along the inner side in the radial direction.

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