JPH10215548A - Motor with pulley - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and high performance capstan motor which is superior in productivity and simple in construction. SOLUTION: A rotor case 40 is made of a synthetic resin. A drive magnet 22 is fixed to a magnetic unit 41 and molded integrally with a core 42. A part of the widthwise direction of a flange 27 unified with a gear unit 26 is embedded in the central circular recess 44 of the rotor case 40, and protrusions 28 are retained with small holes 46 to block rotation. The rotor case 40 and a flange 35 are press-fitted onto a rotary shaft 12 to be fixed. The magnetization 48 for frequency oscillation is applied to the outer circumferential edge 47 of the rotor case 40 at the time of molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capstan motor, and more particularly, to a motor having a rotor case integrated with a toothed pulley (timing pulley).

[0002]

2. Description of the Related Art As shown in FIG.
Reference numeral 10 denotes a bearing 116 provided inside a center hole 115 of a bearing case 114 in which a rotating shaft 112 stands upright on a substrate 113, and a pulley 117 made of a molded product such as a resin is integrally fixed to the rotating shaft 112. The rotor case 118 provided is fixed. On the other hand, a laminated core 120 around which a field coil 119 is wound is fixed to the outer periphery of the bearing case 114. The outer surface of the driving magnet 121 is fixed to the inner surface of the outer peripheral wall 122 of the rotor case 118,
The inner surface 123 is held at a position facing the outer peripheral surface 125 of the salient pole 124 of the laminated core 120 while maintaining a predetermined gap.

The outer peripheral wall 122 of the rotor case 118
A magnetic pole 128 for transmitting a frequency is attached to the outer surface of the magnetic pole 128, and the rotation speed is controlled by a magnetic pulse detected by a sensor 129 installed at a position close to the outer peripheral surface of the magnetic pole 128. The rotating shaft 112 to which the rotor case 118 is fixed is fitted into a bearing 116, and a retaining ring 130 for preventing backward movement in the insertion direction is mounted.

[0004]

In such a conventional pulley-integrated rotor case 118, the rotary shaft 112 is inserted and fixed in a hole 132 passing through a core 131 fixed at the center. The center hole 133 is the core 131
Is press-fitted and fixed. That is, the rotor case 118
And the pulley 117 are made of different members, and the rotor case 11
When the pulley 117 is continuously attached to the surface 134 of the belt 135, the flanges 136 and 137 for preventing the belt 135 from coming off are provided on both sides of the pulley 117. The width dimension X of the entire 117 projects from the surface 134 of the rotor case 118.

[0005] The accommodation space of the motor 110 installed in a specific device is limited, and it is required to reduce the axial dimension. At least the flange 137 on the side of the pulley 117 that is brought into close contact with the rotor case 118 is not necessary for the purpose of preventing derailing. However, in the power transmission means including the belt 135 and the pulley 117, the belt 13
5 has a different peripheral speed and direction from the rotational motion of the peripheral surface 134 of the rotor case 118 immediately adjacent thereto, so that the pulley 117 is connected to the rotor case 11 in order to avoid mutual interference.
8 and must be guided with a distance G from the surface 134 of FIG. The thickness G of the flange 137 of the pulley 117 is
If a predetermined thickness or more is not ensured in the molding process, the flow of hot water becomes poor and the molding may not be performed. Therefore, it is necessary to take a certain thickness. Therefore, simply attaching the pulley 117 to the surface 134 of the rotor case 118 is an obstacle to a reduction in thickness.

SUMMARY OF THE INVENTION An object of the present invention is to provide a compact and high-performance capstan motor which can be reduced in thickness by a simple structure.

[0007]

In order to achieve the above object, a motor with a pulley according to the present invention comprises: a rotating shaft; a rotor case inserted and fixed until one end of the rotating shaft projects; A pulley having a center hole fitted to one end of the shaft is provided, and the pulley drives the belt.

The pulley has a gear portion on the outer periphery, and one of flanges provided on both side surfaces is integrally formed with the gear portion, and a plurality of protrusions are projected on the rotor case side. The rotor case has a concave portion in the center and an engaging hole formed in the concave portion. At least a part of the flange is dropped into the concave portion, and the protrusion is engaged with the engaging hole.

One or both of the rotor case and the pulley are made of a synthetic resin molded product. In addition, in the rotor case, a synthetic resin portion and a magnetic body portion on which a driving magnet is mounted are integrally formed, and the synthetic resin portion on the outer peripheral edge of the rotor case is magnetized for frequency transmission.

The rotating shaft, a rotor case inserted and fixed until one end of the rotating shaft protrudes, and a toothed pulley having a center hole fitted in one end of the rotating shaft, In a motor that drives a belt by a pulley,
The rotor case is made of synthetic resin, and a magnetic body portion on which a driving magnet is mounted and the toothed pulley are integrally formed, and the synthetic resin portion on the outer peripheral edge of the rotor case is magnetized for frequency transmission. You may do so.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motor with a pulley according to the present invention will be described below with reference to the drawings. In the figure,
The same reference numerals are used for common members. FIG. 1 is a sectional view of a motor 10a with a pulley according to a first embodiment of the present invention, in which a rotating shaft 12 is an axis CC perpendicular to a substrate 13.
Are rotatably supported by two bearings 14 and 14 concentrically arranged in series.

The rotor case 15 formed by an appropriate means such as press working, die casting, or synthetic resin molding is attached to the rotating shaft 12 at a predetermined distance from the tip of the rotating shaft 12 inserted into the center hole 16. Fixed. A circular recess 18 is formed at the center of the upper surface 17 of the rotor case 15 in the drawing, and at least two through-holes 19 are provided at equal intervals on the circumference around the center hole 16. Driving magnets 22 are arranged and fixed at equal intervals on the circumference along the outer edge of the lower surface 21.

Field coils 23 are disposed on the substrate 13 at equal intervals on the same circumference surrounding the axis CC, at a position facing the driving magnet 22 with a predetermined gap therebetween. Energized by the interaction with the alternating magnetic field caused by the controlled alternating current applied to the field coil 23,
The driving magnet 22 is driven to rotate.

Reference numeral 25 denotes a toothed pulley, and an outer peripheral gear portion 26 and a flange 27 are integrally formed by any appropriate means such as press working, die casting, or synthetic resin molding. A projection 28 is integrally formed on the lower surface of the flange 27 in the figure at a position corresponding to a through hole 19 provided in the central circular recess 18 of the rotor case 15. The outer diameter of the flange 27 is an outer diameter that fits into the inner diameter of the central circular recess 18 of the rotor case 15 and can be formed sufficiently larger than a normal toothed pulley flange, which is advantageous in assembling operation.

The outer peripheral edge of the flange 27 is slightly provided with a cylindrical portion 29 parallel to the axis CC.
9 has a width w1 which is almost as large as the depth d1 of the central circular recess 18 of the rotor case 15. This cylindrical part 2
9 is a slope 30 whose width increases slightly from the width w1 of the cylindrical portion 29 toward the center, so that the toothed belt 31 is moved from the outer diameter of the gear portion 26 to the outer diameter of the gear portion 26. 26
And function to stably engage.

The flange 2 formed integrally with the gear portion 26
7 is fitted into the central circular concave portion 18 of the rotor case 15. The protrusion 28 protruding from the lower surface of the flange 27 engages with the corresponding through hole 19 of the rotor case 15 and functions as a detent in the relative position of the toothed pulley 25 and the rotor case 15 with respect to the rotation direction.

As described above, the width w1 of the flange cylindrical portion 29 of the toothed pulley 25 is reduced into the depth d1 of the central circular concave portion 18 provided in the rotor case 15, so that the upper surface 17 of the rotor case 15 Since the gap between the inner surface 32 of the toothed belt 31 and the opposing toothed belt 31 is substantially equal to the height h of the slope 30 in the axial direction, and is kept at a very small distance, which is the minimum necessary to avoid contact between them. Rotor case upper surface 1
7 to the running position of the outer surface 33 of the toothed belt 31 can be a reduced distance H.

Reference numeral 35 denotes a flange for preventing the toothed belt 31 from falling off. The toothed belt 31 differs from a normal V-belt in that there is almost no component force in the thrust direction like a flat belt.
For example, a slight biasing force in the axial direction due to free vibration of the toothed belt 31 or the like can be sufficiently prevented.

With the above configuration, the motor 10a
Can form a space with a distance H shortened in the axial direction.

FIG. 2 is a sectional view of a rotor case 40 in a motor 10b with a pulley according to a second embodiment of the present invention.
The rotor case 40 is made of a synthetic resin, and has a ring-shaped magnetic body portion 41 on which the driving magnet 22 is mounted and the core metal 4.
2 and are integrally formed. This rotor case 40
In the drawing, a circular concave portion 44 is formed in a central portion on the upper surface 43, and the bottom surface of the central circular concave portion 44 is aligned with the end surface 45 of the metal core 42 in the same plane. A small engaging hole 46 is formed in a position corresponding to the protrusion 28 protruding from the flange 27 integrally formed with the gear portion 26 at regular intervals on the circumference of the metal core 42.

A toothed pulley 25 similar to that of the first embodiment is used, and the depth d2 of the central circular concave portion 44 is formed substantially equal to the width w1 of the outer peripheral cylindrical portion 29 of the flange 27. Therefore, when the flange 27 is fitted into the central circular concave portion 44 of the rotor case 40, the protrusion 28 protrudes from the lower surface of the flange.
Are engaged with the corresponding small holes 46 of the rotor case 40, and the toothed pulley 25 and the rotor case 4 are engaged in the same manner as in the first embodiment.
It functions as a detent for the relative position with respect to the rotation direction with 0.

As in the first embodiment, the toothed pulley 25 is press-fitted into the rotating shaft and connected to the rotor case 40, and thereafter the flange 35 for preventing the wheel from being detached of the toothed belt 31 is press-fitted and fixed as in the first embodiment. Thus, also in the second embodiment, the gap h between the rotor case upper surface 43 and the toothed belt side surface 32 is reduced to a necessary minimum, and the running area from the rotor case upper surface 43 to the outer surface 33 of the toothed belt is reduced. Can be reduced to the distance H.

Further, in the second embodiment, at the time of molding, magnetizing 48 for frequency transmission can be applied to the outer peripheral edge 47 of the rotor case 40 formed of synthetic resin. For this reason, it is not necessary to increase the magnetic pole of a separate member for frequency transmission, so that the space in the radial direction can be saved. Reference numeral 49 denotes a sensor for controlling the rotation speed by the detected magnetic pulse. In addition, the toothed pulley 2 integrated with the rotating shaft 12, the bearing 14, the field coil 23, and the flange 27 having the protrusion 28 formed on the substrate 13.
5 and the toothed belt 31 have the same configuration as that of the first embodiment, and therefore the description is omitted.

FIG. 3 is an exploded sectional view of a rotor case 40 of a motor 10c with a pulley according to a third embodiment of the present invention, which is a modification of the toothed pulley 25 in the second embodiment. A rotor case 40 similar to that of the second embodiment is used. In the toothed pulley 50 in the third embodiment, the gear 5
The flange 52 integrally formed with the flange 1 is on the opposite side of the rotor case 40 and corresponds to the derailment preventing flange 35 in the second embodiment, and the protrusion 53 is provided on the bottom surface 54 of the gear portion 51. Since the outer diameter of the gear portion 51 is smaller than the outer diameter of the flange 27 in the first and second embodiments, the pitch pitch circle p of the protrusion 53 is naturally the pitch circle diameter of the protrusion 28 in the above embodiment. Smaller.

The central circular recess 4 of the rotor case 40
The fitting 4 is a washer flange 55, which has a through hole 56 at a position corresponding to the protrusion 53 on the bottom surface of the gear portion. For this reason, the engaging small hole 46 formed in the central circular concave portion 44 of the rotor case 40 is formed at a position corresponding to the protrusion 53 on the lower surface of the gear portion, and the protrusion length of the protrusion 53 is equal to that of the washer flange 55. It is provided with a sufficient length to penetrate the thickness and engage with the engagement small hole 46.

The washer flange 55 is a disk-shaped plate member having a thickness t. The outer periphery of the cylindrical portion 57 has a slight width w2 that is parallel to the axis C--C.
The outer circumferential surface of the gear portion 51 on the side in contact with the bottom surface 54 is formed with a slope 59 reaching the thickness t from the pulley side edge 58 of the cylindrical portion 57, and the flange slope 30 of the second embodiment is formed. Works the same as.

The washer flange 55 is fitted into the central circular recess 44 of the rotor case 40, the through hole 56 is aligned with the small engaging hole 46, and the gear is disposed so as to sandwich the washer flange 55 between the central circular recess 44. The portion 51 is crimped, and the protrusion 53 is inserted into the small engaging hole 46 through the through hole 56 (arrow in the figure). Also in this configuration, the toothed pulley 50 operates in the same manner as in the second embodiment, and also in the third embodiment, the gap h between the rotor case upper surface 43 and the toothed belt side surface 32 is reduced to the minimum necessary. The distance from the upper surface 43 of the rotor case to the running area of the outer surface 33 of the toothed belt can be reduced to the distance H, which effectively functions to reduce the axial space. The other configuration is the same as that of the second embodiment, and the description is omitted.

FIG. 4 is an exploded sectional view of a rotor case 60 of a motor 10d with a pulley according to a fourth embodiment of the present invention.
Numeral 2 denotes the same synthetic resin molded product, which is integrally formed with the magnetic core 41 to which the core bar 63 and the driving magnet 22 are attached. Is applied. The central portion of the rotor case 60 has a slope 66 extending from a position corresponding to the outer diameter of the flange toward the outer diameter of the gear portion 62 to a height h so that the outer peripheral edge of the gear portion 62 functions in the same manner as in the second embodiment. Form.

After the center hole 16 of the cored bar 63 integrated with the rotor case 60 thus configured is press-fitted and fixed at a predetermined position of the rotary shaft 12, the flange cap 67 is used to prevent the toothed belt 31 from coming off. Rim 6 protruding inside from the outside diameter of
8 is press-fitted and fixed into an opening 69 provided on the end face of the gear portion 62 to form a toothed pulley 61 integrated motor 10d (arrow in the figure).

Also in the fourth embodiment, the gap h between the rotor case upper surface 43 and the toothed belt side surface 32 is reduced to a necessary minimum, and the distance from the rotor case upper surface 43 to the running area of the toothed belt outer surface 33 is reduced. It can be reduced to the distance H, and functions effectively to reduce the axial space. In addition, since the gear portion 62 and the rotor case 60 are integrally formed, the pitch between the magnetized portions 65 provided on the outer peripheral edge portion 64 of the rotor case and the tooth pitch of the gear portion 62 do not relatively shift. Accurate rotation control can be performed. The other configuration is the same as that of the second embodiment, and the description is omitted.

FIG. 5 is a partial sectional view of a rotor case 70 of a motor 10e with a pulley according to a fifth embodiment of the present invention. The gear portion 72 of the toothed pulley 71 has an integral construction made of the same material as a cored bar 73. As in the fourth embodiment, the driving magnet 2
2 is integrally molded with the rotor case 70 made of synthetic resin together with the magnetic body portion 41 to which the magnetic member 41 is attached.
Is subjected to frequency transmission magnetization 75. Also, in the center of the rotor case 70, the outer peripheral edge of the gear portion 72 is directed from the position corresponding to the flange outer diameter to the outer diameter of the gear portion 72 as in the fourth embodiment, so that the outer peripheral edge of the gear portion 72 functions in the same manner as in the second embodiment. Is formed to a height h.

After the center hole 16 of the cored bar 73 integral with the toothed pulley 71 integrally formed with the rotor case 70 is press-fitted and fixed to the rotating shaft 12, the rim of the flange cap 77 is fixed to prevent the toothed belt 31 from coming off. 78 is press-fitted and fixed into an opening 79 provided in the end face of the gear portion 72 to form the toothed pulley 71 integrated motor 10e.

Also in the fifth embodiment, the rotor case 70
By forming the slopes 76 of the upper surface 43 together at the time of molding, the gap h between the upper surface 43 and the inner surface 33 of the toothed belt is selected to be the minimum necessary. Can be achieved. In addition, the gear part 7 is integrally formed.
As the second embodiment, a material different from the rotor case 70, for example, a wear-resistant engineering plastic or metal can be used as in the first to third embodiments. Further, by making the outer diameter of the cored bar smaller than the root diameter of the gear, the method of processing the gear can be freely selected, including cutting and rolling. The other configuration is the same as that of the fourth embodiment, and the description is omitted.

According to the above-described embodiment of the present invention, in the second to fifth embodiments, the rotor cases 40, 60, 7
The configuration of the zero and the toothed pulleys 50, 61, 71 effectively functions to shorten the space in the axial direction, similarly to the rotor case 15 and the toothed pulley 25 in the first embodiment. In the second to fifth embodiments, in addition to the facing arrangement of the field coil and the rotating magnet, the outer edge of the rotor case is magnetized for frequency transmission, thereby reducing the radial space. As it is, the performance can be improved without increasing the number of members in the outer peripheral direction.

Although the embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above embodiments, and can be variously modified without departing from the gist thereof. For example, in the above embodiment, the present invention has been described as applied to an axial gap type motor, but it is needless to say that the present invention is also applicable to a radial gap type motor.

[0036]

As described above, in the motor with a pulley according to the present invention, the connecting portion of the toothed pulley with the rotor case is embedded in the rotor case, so that the motor can be made thinner. In addition, the connection between the projections and the engagement holes included in the connection portion of the toothed pulley with the rotor case functions as a reliable rotation stop, and the rotation angle between the belt and the rotor case is accurately transmitted, and The frequency transmission magnetization applied to the outer periphery of the case can be effectively used for rotation control.

Further, since the frequency transmission is magnetized directly on the outer periphery of the rotor case at the same time as the molding of the rotor case, the performance can be improved without being affected by the reduction of the occupied space, and the structure is simplified and the processing steps are simplified. Be transformed into Therefore, productivity is improved and a great economic effect can be expected.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of a motor with a pulley according to the present invention.

FIG. 2 is a sectional view of a second embodiment of the motor with a pulley according to the present invention.

FIG. 3 is an exploded sectional view of a rotor case of a third embodiment of the motor with a pulley according to the present invention.

FIG. 4 is an exploded sectional view of a rotor case of a fourth embodiment of the motor with a pulley according to the present invention.

FIG. 5 is a partial sectional view of a rotor case according to a fifth embodiment of the motor with a pulley according to the present invention.

FIG. 6 is a sectional view of a conventional motor with a pulley.

[Explanation of symbols]

 10a, 10b, 10c, 10d, 10e Motor 12 Rotating shaft 13 Substrate 14 Bearing 15, 40, 60, 70 Rotor case 16 Center hole 18, 44 Central circular recess 19 Through hole 22 Driving magnet 25, 50, 61, 71 teeth Pulleys 26, 51, 62, 72 Gears 27 Flanges 28, 53 Protrusions 31 Toothed belt 35 Flanges 41 Magnetic parts 42, 63, 73 Cores 48, 65, 75 Magnetization 49 Sensor

Claims (4)

[Claims] 1. A rotating shaft, a rotor case inserted and fixed until one end of the rotating shaft protrudes, and a pulley having a center hole fitted to a tip end of the rotating shaft, and the pulley forms a belt. In the motor to be driven, the pulley has a gear portion on the outer periphery and one of flanges provided on both side surfaces is integrally formed with the gear portion, and a plurality of protrusions are projected on the rotor case side, The rotor case has a concave portion in the center and an engaging hole formed in the concave portion, and at least a part of the flange is dropped into the concave portion, and the protrusion is engaged with the engaging hole. Characteristic motor with pulley. 2. The motor with a pulley according to claim 1, wherein one or both of the rotor case and the pulley are formed of a synthetic resin. 3. The rotor case according to claim 1, wherein a synthetic resin portion and a magnetic body portion to which a driving magnet is mounted are integrally formed, and the synthetic resin portion on the outer periphery of the rotor case is magnetized for frequency transmission. The motor with a pulley according to claim 2, characterized in that: 4. A toothed pulley comprising: a rotary shaft; a rotor case inserted and fixed until one end of the rotary shaft projects; and a toothed pulley having a center hole fitted into one end of the rotary shaft. In a motor for driving a belt by a pulley, the rotor case is made of synthetic resin, and a magnetic body portion on which a driving magnet is mounted and the toothed pulley are integrally formed. A motor with a pulley characterized in that a magnet for frequency transmission is applied to the motor.