JP5528137B2 - Geared motor - Google Patents

Description

The present invention relates to a geared motor used for a door lock mechanism, an optical precision device, and the like, and in particular, even if a voltage or current exceeding specified values such as noise and surge is received, these are installed through the inside. The present invention relates to a geared motor that does not adversely affect the control board or circuit of the device.

  For example, in general, in an electrical device such as a motor, a certain space is provided between conductors to prevent noise, surge, etc., and insulation coating is performed. In addition, a capacitor, a resistor, and the like are combined and built in the motor to remove or reduce noise, surge, and the like.

Japanese Utility Model Laid-Open No. 4-14462 Japanese Utility Model Publication No. 6-88176

However, those proposed in Patent Document 1 and Patent Document 2 both protect the motor itself, and have a built-in chip capacitor to remove electrical noise, or mount a varistor on the commutator. The varistor absorbs and reduces the surge voltage and abnormal voltage generated between the brush and the commutator, and passes through the motor, and is attached to a control board such as a door lock mechanism or an optical precision device. And it did not negate the influence on the circuit.

  The present invention has been made in view of the above problems, and the object of the present invention is to provide a geared motor that cuts off abnormal voltage and current without increasing the number of special parts and eliminates the influence on the installed equipment. Is to provide.

The present invention is geared to a planetary gear mechanism is provided in the housing, the rotation of the motor rotor shaft attached to the seat while fixed to one axial end of the housing, to transfer motion to the output shaft through the planetary gear mechanism In the motor, an input gear attached to the tip of the rotor shaft, a planetary gear provided in the planetary gear mechanism and formed of an insulating material meshing with the input gear, a planetary shaft fitted to the planetary gear, and the planetary shaft A sun plate having a sun gear that transmits the rotation of the input shaft to the output shaft side, and a sun plate disposed facing the input gear, wherein the edge on the sun plate side of the input gear is a planetary gear.
The input gear and the planetary gear mesh with each other in a state of being located closer to the spacer side than the edge on the solar plate side, so that a space is formed between the input gear and the solar plate, and the spacer is formed of an insulating material. It is characterized by being.
The spacer preferably has a motor attachment frame into which the motor is inserted.
The planetary gear mechanism includes another planetary gear that meshes with the sun gear and transmits the rotation of the sunplate to the output shaft side, and the planetary gear that meshes with the input gear has a longer tooth width than other planetary gears. It may be formed.

  According to the first aspect of the present invention, the planetary gear and the spacer are formed of an insulating material, the input gear is positioned apart from the sun plate, and the motor mounting frame is formed in the spacer, thereby the planetary gear. The insulation state is maintained from noise or surge voltage from the gear mechanism side or the motor side.

It is line sectional drawing of the geared motor which concerns on this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a sectional view of a geared motor according to the present invention.

The gear portion of the geared motor 1 shown in FIG. 1 (hereinafter referred to as a planetary gear device 2) shows an example in which there are two speed reduction stages.
The planetary gear device 2 includes a housing 20 including a planetary gear mechanism portion 20a that houses a planetary gear mechanism, and an output shaft portion 20b to which an output shaft 21 and a bearing 22 are attached. And the internal gear 23 is formed in the internal peripheral surface of this planetary gear mechanism part 20a. In addition, a thin annular edge 20c projects in the axial direction at the opening in the axial direction of the planetary gear mechanism 20a.

A disc-shaped spacer 3 is fitted into the annular edge 20c, and the motor mounting frame 30 is fixed by a split pin 31 in a state of being in contact with the tip of the annular edge 21c.

In the center of the spacer 3, a circular hole 32 is formed through which a rotor shaft 40 of the motor 4 and an input gear 41 attached to the tip of the motor 4 are inserted, and the motor is disposed at two opposite positions around the circular hole 32. A set screw hole 33 is formed. In addition, a motor mounting frame 30 on the bottom surface of the spacer 3 and into which the motor 4 is inserted is integrally formed with, for example, a polypropylene terephthalate resin having excellent electrical characteristics. Reference numeral 34 denotes a resin thrust washer.

In the output shaft portion 20b , a base portion of the output shaft 21 is rotatably accommodated via a bearing 22. A knurled 21a is provided on the inner tip of the output shaft 21, and a fitting hole is provided in the center. The output plate 24 is press-fitted and fixed. Further, the output shaft 21 is press-fitted so that there is almost no backlash in the axial direction of the output shaft 21 with a cylindrical fixed bush 25 in contact with the bearing 22 from the outer end.

The output plate 24 is accommodated in the output shaft portion 20b, and a plurality of (for example, three) first planetary shafts 24a are integrally formed at equal intervals in the circumferential direction, and each first planetary shaft 24a includes The first planetary gears 26 having the same number of teeth are rotatably fitted to form the final reduction stage B.

Each of the first planetary gears 26 meshes with the internal gear 23 on the inner circumference of the planetary gear mechanism 20a and meshes with the central sun gear 27 so that the sun rotates while rotating in the internal gear 23. Revolves around the gear 27.

The sun gear 27 is integrated with a sun shaft 28 a that is formed between the input gear 41 and the inner tip of the output shaft 21 and is integrally formed at the center of the disk-shaped solar plate 28 at a position in contact with the output plate 24. Formed or press-fitted and fixed.

On the surface opposite to the sun shaft 28a of the sun plate 28, a second planetary shaft 28b of the plurality at equal intervals in the circumferential direction (for example, three) are integrally formed, each of the respective second planetary shaft 28b identical For example, a second planetary gear 29 made of polyacetal resin having a small rigidity and excellent sliding characteristics to prevent noise, surge, etc. of the number of teeth is formed longer than the first planetary gear 26, A speed reduction stage A is configured by being rotatably fitted.

Each of the second planetary gears 29 meshes with the internal gear 23 on the inner periphery of the planetary gear mechanism 20 a and meshes with the central input gear 41 so that the input gear rotates while rotating in the internal gear 23. Revolve around 41.

The input gear 41 fixed to the rotor shaft 40 of the motor 4 meshes with the second planetary gear 29 formed longer than the front first planetary gear 26 at the base portion on the spacer 3 side. Thus, a space for preventing noise, surge, and the like is provided between the input gear 41 and the sun plate 28.

If the spacer 3 is too thin, the strength of fixing the split pin 31 may be reduced, and it is preferable to make the spacer 3 as thick as possible in terms of preventing noise and surge.

  Next, the motor 4 will be described. In the motor 4, a cylindrical case portion 42 and an end wall portion 43 b having a holder portion 43 a extending in the case portion constitute a casing 43 and accommodate a rotor 44.

The holder portion 43 a is provided with a through hole 45 in the axial direction, and a bearing 46 a is press-fitted into the opening portion of the through hole 45 on the end wall portion 43 b side. A bearing 46 b is press-fitted into the opening on the inner end side of the through hole 45. A magnet 47 is fitted on the outer periphery of the holder portion 43a.

The rotor 44 connects the coil 48 and the rotor shaft 40 to the cylindrical coil 48 disposed in the gap between the magnet 47 and the cylindrical case portion 42 with the rotor shaft 40 rotatably supported by the bearings 46a and 46b as an axis. The end block 49 includes a commutator 50.

Outside the casing 43, a collar 55 is fixed to the rotor shaft 40 in the vicinity of the bearing 46a, and a collar 56 is provided between the collar 55 and the bearing 46a. When the collar 55 is pushed by the collar 55 and abuts against the end face of the bearing 46a, the movement of the rotor 44 in one direction is restricted.

Clearances are formed between the coil 48 and the outer peripheral surface of the magnet 47 and between the coil 48 and the inner wall of the cylindrical case portion 42 so as not to contact each other. A cap 52 including a brush 51 that is in sliding contact with the commutator 50 is attached to the open end of the cylindrical case portion 42. A hole 52 having a diameter larger than the diameter of the portion of the commutator 50 that contacts the brush 51 is provided at the center of the cap 52, and a cover member 53 that closes the hole 52 is attached. Incidentally, 54 motor terminals are electrically connected to lead wires (not shown).

  In the geared motor 1 configured as described above, the rotation of the motor 4, that is, the rotation of the input gear 41 at the tip of the rotor shaft 40, is output after being decelerated through the two reduction stages A and the final reduction stage B. Conducted as rotation of the shaft 21.

If the equipment with the geared motor 1 attached from the outside or the geared motor 1 main body receives noise or surge, it will go into the geared motor 1 or equipment along the conduction path, and the geared motor 1 or equipment will be short-circuited. Or damage the control circuit.

However, in the present embodiment, in the planetary gear device 2 that decelerates the rotation of the motor 4, a space for preventing noise, surge, and the like is provided between the input gear 41 and the sun plate 28. That. The second planetary gear 29 that directly receives the rotation of the input gear 41 is formed of an insulating material, thereby insulating noise, surge, and the like in the rotational conduction path.

Further, the planetary gear device is composed of a spacer 3 in which a motor mounting frame 30 to which the motor 4 is inserted and attached to the annular edge portion 21c of the planetary gear mechanism portion 21a is integrally formed of an insulating material, and a resin thrust washer 34. Insulates noise and surge from the housing 20 of the motor 2 or the cylindrical case portion 42 and the casing 43 of the motor 4.

  In recent years, there has been an increase in size and weight, and it has been impossible to secure sufficient insulation space and reduce the number of parts, that is, noise filters, surge protection products, etc., while reducing costs. Insulation state such as effective noise and surge can be maintained with a simple structure and configuration.

  Although the gear portion of the geared motor 1 has been described with the planetary gear device 2, the gear portion is not limited to this and may be a spur gear device, and may be a ceramic such as the spacer 3 and the second planetary gear 29. May be.

1 geared motor 2 gear (planetary gear unit)
3 spacer 4 motor 20 housing 26 first planetary gear 29 second planetary gear 30 motor mounting frame 40 rotor shaft 41 input gear

Claims (3)

Planetary gear mechanism is provided in the housing, the rotation of the motor rotor shaft attached to a spacer fixed to one axial end of the housing, the geared motor to transfer kinetic to the output shaft through the planetary gear mechanism ,
An input gear attached to the tip of the rotor shaft;
A planetary gear provided in the planetary gear mechanism and formed of an insulating material meshing with the input gear;
A planetary shaft fitted to the planetary gear and a sun plate that transmits the rotation of the planetary shaft to the output shaft side and is disposed facing the input gear, and
The input gear and the planetary gear mesh with each other in a state in which the edge on the sun plate side of the input gear is positioned closer to the spacer side than the edge on the sun plate side of the planetary gear. And a space is formed between the solar plate,
The geared motor, wherein the spacer is formed of an insulating material .   The geared motor according to claim 1, wherein the spacer has a motor mounting frame into which the motor is inserted and attached.   The planetary gear mechanism includes another planetary gear that meshes with the sun gear and transmits the rotation of the sunplate to the output shaft side, and the planetary gear that meshes with the input gear is compared to the other planetary gear. The geared motor according to claim 1, wherein the tooth width is long.

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