JPS6048979B2 - Small motor rotation direction selection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for changing the rotation direction of a rotor clockwise only by switching a switch knob for a small motor such as an AC inductor type motor whose rotation direction is non-directional in principle. The present invention relates to a rotation direction selection device for a small motor that can select either the rotation direction or the counterclockwise direction.

In a motor such as the AC motor mentioned above, in which the rotation direction of the rotor is in principle non-directional, or is likely to become non-directional,
It is known that electric or mechanical reverse prevention means are integrally provided in order to realize unidirectional rotation (for example, Utility Model Publication No. 41-96 Part II, Utility Model Publication No. 53-53).
No. 046), the rotation direction of the rotor is fixedly determined as either clockwise or counterclockwise, and the rotation direction can be switched to either clockwise or counterclockwise. There has never been a motor with this function.

The present invention is intended to enable the rotation direction of such a small motor to be switched and selected between clockwise and counterclockwise.

In the present invention, the forward rotation direction refers to the rotation direction selected by the selection means, regardless of whether it is clockwise or counterclockwise, and the reverse rotation direction refers to the direction opposite to the forward rotation direction. Hereinafter, one embodiment of the present invention will be described based on the drawings. In FIGS. 1 and 2, 1 is a rotor of a small AC motor, and the rotor 1 is rotatably supported on a rotor shaft 2. A small-diameter main drive gear 3, which rotates integrally with the rotor 1, is coaxially fixed to the upper surface of the rotor 1.

Reference numerals 4 and 4 designate engagement protrusions that protrude outward from the lower large-diameter portion 5 of the main drive gear 3 at an angular phase of 180 degrees;
, the lower large-diameter portion 5 and the engaging protrusions 4, 4 are integrally manufactured by injection molding of synthetic resin, and are integrally fixed to the rotor 1 by an insert in a position of fitting onto the rotor shaft 2. .

6 is a substrate surrounding the rotor 1 with an appropriate gap,
This substrate 6 constitutes a stator in the present invention, and also constitutes a rotor 1.
An excitation coil 7 is provided which has a magnetic pole corresponding to the magnetic pole of the substrate 6 and is magnetically coupled to the substrate 6.

Reference numerals 8 and 9 denote a support shaft and a stopper post that penetrate through the board 6 and are erected on the motor casing 10, and are erected at a position where the axes of 2, 8, and 9 are connected approximately in a straight line with respect to the rotor shaft 2. Supported.

A large-diameter synthetic resin response gear 11 and a synthetic resin sliding ring 12 frictionally fitted to the lower surface of the large-diameter response gear 11 are rotatably fitted onto the support shaft 8 . As shown in FIG. 3, the response gear 11 has a cylindrical sliding ring fitting portion 13 coaxially and integrally protruded from the lower surface thereof when the gear 11 is injection molded. This fitting part 13 is divided into a plurality of parts in the circumferential direction, and is composed of a plurality of divided short pieces 14 that can be elastically deformed in the inner and outer directions by pressure centering on the upper base side, and each divided short piece 14.・
A retaining rib 15 that bulges outward is provided at the tip. On the other hand, the sliding ring 12 has four engaging arms 17a to 17d extending from its ring main body 16 as shown in FIG.
are integrally projected at an appropriate angle in the circumferential direction, and a sliding rib 18 is coaxially and annularly integrally projected from the upper surface of the ring main body 16. This five-slide contact ring 12 is externally fitted onto the fitting portion 13 while elastically deforming the divided short pieces 14 inward, and in this externally fitted state, the retaining ribs 15 and
... prevents the sliding ring 12 from falling off unexpectedly. Furthermore, in the mounting position of the sliding ring 12, the fitting portion 13 and the ring main body 16 collide with weak pressure due to the elastic force of each short segment 14, and when there is no load on the sliding ring 12, the response gear 1
Sufficient frictional fitting force is developed to rotate together with 1. Further, the entire upper surface of the sliding ring 12 is not brought into contact with the lower surface of the response gear 9, but only through the sliding contact rib 18. This is to ensure that if a sliding prevention force acts on the sliding contact ring 12, the frictional connection between the two will be easily broken. The small diameter gear 19 coaxially provided on the upper surface of the response gear 11 is a transmission gear 4 that is integrally provided during injection molding of the response gear 11, and is a transmission gear 4 that is integrally provided at the time of injection molding of the response gear 11.
This is to further decelerate the deceleration rotational force of the motor input to the motor and transmit it to the required parts. The response gear 11, to which the sliding ring 12 is attached as described above, is rotatably attached to the spindle 8 by fitting its boss portion 20 onto the spindle 8 from above, and in this mounting position, the main drive gear is rotated. The gear 3 and the response gear 11 are mutually geared, and the stopper post 9 is located between the engagement arms 17d and 17c. The height of this stopper pin 9 is set to a height that does not prevent rotation of the response gear 11 attached to the support shaft 8. Reference numeral 21 denotes an operating shaft that is parallel to the rotor shaft 2 and passes through the motor casing 10 and the board 6 from inside to outside.An operating knob (not shown) is fixed to the outer end of the operating shaft 21, and an operating knob (not shown) is fixed to the inner end of the operating shaft 21. A slide lever 22 is held.

The slide lever 22 has an elongated hole 23 extending through its center, and is positioned such that the operating shaft 21 is inserted through the elongated hole 23. In addition, engagement pins 24 and 25 are provided on the slide lever 22 at one position sandwiching the elongated hole 23 with a slight gap in the sliding direction of the slide lever, and a cam pin 26 is provided on the operating shaft 21 correspondingly. The cam pin 26 engages and presses one of the engaging pins 24 and 25 depending on the direction of rotation of the operating shaft 21, thereby moving the slide lever 22 upward or downward in FIG. It is configured to slide. Reference numerals 27, 27 are guide posts for ensuring that the sliding direction of the slide lever 22 is kept in a straight line, and these guide posts 27, 27 are fitted into elongated holes 28, 28 at both ends of the slide lever 22.

Furthermore, hook-shaped grips 29, 29 are formed in the slide lever 22 by cutting out a part of the elongated holes 28, 28, and a guide post 27 is formed on these grips 29, 29 at the forward stroke end of the slide lever. , 27 are engaged, and positioning depressions 30a, 30b are formed in which the guide posts 27, 27 engage at the slide lever return stroke end.
Further, the slide lever 22 is provided with a protruding portion 31 close to the support shaft 8, and the engaging arms 17a to 1 are always mounted on this leg protruding portion 31 regardless of the sliding movement of the slide lever 22.
A stopper pin 32 located in the rotation locus 7d is planted. In this embodiment, the stopper pin 32 is located between the engaging arms 17b and 17c. With the above structure, when the operating shaft 21 is rotated using the operating knob, the cam pin 26 comes into contact with either of the engagement pins 24, 25 depending on the direction of rotation.

Then, when it comes into contact with the engagement pin 25, the slide lever 2
2 slides downward in the figure as shown in FIG. and is elastically engaged with each of the recessed notches 30a, 30a. As a result, the stroke end of the slide lever 22 is set, and the posture shown in FIG.
a, 30a. When the operating shaft 21 is rotated in the opposite direction from the state shown in FIG. 5, the cam pin 26 comes into contact with the engagement pin 24, causing the slide lever 22 to slide upward in the drawing as shown in FIG. At the end of the stroke, the guide posts 27, 27 ride over the peaks 33, 33 of the grippers 29, 29, reach the other ends of the long grooves 28, 28, and are elastically engaged with the respective recesses 30b, 30b. In this manner, the slide lever 22 is selectively switched to the position shown in FIG. 5 or 6 depending on the direction of rotation of the operating shaft 21. or,
In conjunction with the sliding of the slide lever 22, the posture control operation of the sliding contact ring 12 to the neutral position is performed by the C stopper pin 32.

The neutral position of the sliding contact ring 12 is defined as the solid line in FIGS. 5 and 6 in which neither of the engaging arms 17a, 17b of the sliding contact ring 12 enters into the rotation locus of the engaging projections 4, 4. It refers to posture. That is, the stopper pin 32 is connected to the slide lever 22.
When the engaging arm 17c slides downward in the figure as shown in FIG.
is pressed to rotate the sliding contact ring 12 slightly clockwise, and the engaging arm 17 is rotated from within the rotation locus of the engaging protrusions 4, 4.
When the slide lever 22 slides upward in the figure as shown in FIG. The engaging arm 17a is rotated in the counterclockwise direction by a certain amount, and the engaging arm 17a is pulled out from within the rotation locus of the engaging protrusions 4, 4, and positioned at the neutral position shown by the solid line in FIG. Incidentally, when the slide ring 12 is already in the neutral position when the slide lever 22 is switched, as is clear from the above explanation, the stopper pin 32 presses both engagement arms 17b and 17c and engages both engagement arms 17b and 17c. arm child 1
It only moves between 7b and 17c. Therefore, the moving distance of the stopper pin 32, ie, the slide lever 22, corresponds to the distance between the engaging arms 17b and 17c. In order to achieve the above effect, as shown in FIG. 4, the angles between the engaging arms 17a and 17d, 17b and 17c are made narrow angles, and the angles between the engaging arms 17a, 17b, 117c and 17d are made wide angles. is appropriate. To start the motor in FIG. 5, when the rotor 1 starts rotating in the direction of arrow A, the reaction gear 11 rotates counterclockwise as the main drive gear 3, which is integral with the rotor 1, rotates clockwise. Therefore, this response gear 11
The sliding ring 12, which is friction-fitted in the sliding ring 12, also tends to rotate in the same direction.

However, as the slide lever 22 moves downward in FIG. 5, the stopper pin 32 comes into contact with the engagement arm 17c, and the rotational force applied to the sliding ring 12 in the neutral position is applied to the stopper pin 32. Since the rotational force is in the direction of further pressing the engagement arm 17c against the sliding contact ring 1
2 and the response gear 11 is broken, the sliding ring 12 remains stopped at the neutral position, and only the response gear 11 rotates. Therefore, the rotor 1 and the main drive gear 3 rotate continuously in the clockwise direction, and the response gear 11 is rotated at a reduced speed, and the rotational force is transmitted to the required parts via the transmission gear 19. However, when the rotor 1 begins to rotate in the opposite direction to the direction of arrow A as the motor starts, the rotation direction of the main drive gear 3 becomes counterclockwise, and the rotation direction of the response gear 11 in concert with this becomes counterclockwise. The rotational force is input to the sliding ring 12 in a clockwise direction. The sliding contact ring 12 in the neutral position cannot rotate counterclockwise because the engagement arm 17c contacts the stopper pin 32 as described above, but it is free to rotate clockwise. It rotates integrally with the response gear 11, and during this rotation, the engagement arm 17a enters into the rotation locus of the engagement protrusions 4, 4 and comes into contact with the large diameter portion 5, as shown by the imaginary line in FIG. When the engagement protrusion 4 collides with the engagement arm 17a to stop the rotation of the main drive gear 3, at the same time, the engagement arm 17b engages the stopper pin 32, and the engagement arm 17c engages the stopper post 9. The sliding contact ring 12 is prevented from rotating. Then, the rotor 1 reversely rotates in the opposite direction to the above due to the repulsive force at the time of the collision engagement, and the positional relationship between the wide-angle magnetic poles and the permanent magnets shifts, so that a clockwise rotational force is applied to the rotor 1. Therefore, the sliding ring 12 is rotated in the opposite direction and stops at the neutral position where the engagement arm 17c is in contact with the stopper pin 32 again, and this operation causes the engagement arm 17a to move between the engagement protrusions 7, 7. After retreating from the rotation trajectory, rotor 1
is continuously rotated in the clockwise direction. Therefore, in the state shown in FIG. 5, the rotor 1 rotates only in the clockwise direction (forward rotation direction) and is prevented from rotating in the counterclockwise direction. In addition, when the motor is started in FIG. 6, when the rotor 1 begins to rotate in the direction of arrow B, which is opposite to the above, the main drive gear 3 moves counterclockwise, and the response gear 11 and the sliding contact ring 12 rotate. Attempt to rotate clockwise.

At this time, due to the switching operation of the slide lever 12, the stopper pin 32 has moved to the position where it comes into contact with the engagement arm 17b. 32 to prevent the sliding ring 112 from rotating, and the sliding ring 1
2 remains in a neutral position. Therefore, the rotor 1 and the main drive gear 3 continuously rotate counterclockwise, and the response gear 11
is rotated at a reduced speed, and its rotational force is transmitted to a required portion via the transmission gear 19. However, when the rotor 1 begins to rotate in the direction opposite to the direction of arrow B as the motor starts, the rotation direction of the main drive gear 3 becomes counterclockwise, and rotational force in the same direction is applied to the sliding ring 12. input. Sliding ring 1 in neutral position
2, rotation in the clockwise direction is not possible because the engaging arm 17b contacts the stopper pin 32, but it is free to rotate in the counterclockwise direction, so the response gear 11 is rotated integrally with the rotation. As shown in the imaginary line in FIG. 6, the engaging arm 17b enters into the rotation locus of the engaging protrusions 4, 4 and comes into contact with the large diameter portion 5, and the engaging arm 17b has the engaging protrusion. 4 collide and engage, and the rotation of the main drive gear 3 is stopped. Then, the rotor 1 reversely rotates in the opposite direction to the above due to the reaction force at the time of collision engagement, and the positional relationship between the wide-angle magnetic poles and the permanent magnets shifts, so that
A clockwise rotational force is applied to the rotor 1, so that the sliding ring 12 returns to the neutral position, and thereafter the rotor 1 is continuously rotated in the counterclockwise direction. Therefore, in state 5 of FIG. 6, the rotor 1 rotates only in the counterclockwise direction (forward rotation direction), and rotation in the counterclockwise direction is prevented. Slide lever 2 like this
By switching 2 in either direction, the forward rotation direction of the rotor 1 is selected as either clockwise or counterclockwise 4, and rotation in the reverse rotation direction is reliably prevented. As described above, in the present invention, when transmitting the rotational force of the motor rotor 1 from the main drive gear 3 to the response gear 11,
Engagement protrusions 14, 14 are integrally provided in a stepped manner protruding from the main drive gear 3, and a sliding ring 12 is frictionally connected to the response gear 11.
When the motor rotor 1 rotates in the forward rotation direction, the stopper pin 32 prevents the rotation of the sliding ring 12 and allows the response gear 11 to rotate independently. When rotating in the opposite direction, the sliding ring 12 is rotated integrally with the response gear 11, and the engagement arm 17 is rotated in the opposite direction.
a, 17b are collidingly engaged with the engagement protrusions 14, 14, thereby preventing rotation of the motor rotor 1 in the reverse rotation direction, and at the same time, the rotation of the motor rotor 1 is prevented by the reaction force at the time of colliding engagement. Change to forward rotation direction.

Moreover, the sliding contact ring 12 has two engaging arms/children 17a, 1
7b is provided in a protruding manner, and the stopper pin 32 is interlocked with a selection means 21 for selecting the rotation direction of the motor rotor 1, and also determines whether the direction of rotation of the sliding contact ring 12 to be blocked is clockwise or counterclockwise. Since the configuration is such that the positioning is performed by selecting two positions in order to engage in either direction, by switching the selection means 21, the rotation direction of the motor rotor 1 can be changed clockwise or counterclockwise. You can easily switch and select either one. Therefore, for example, when the present invention is applied to a small motor of a timer for setting the heating time of a toaster oven that can switch between two types of power, 600W and 300W, the present invention If the selection means 21 and the operation of the power changeover switch are linked, for example, by turning this knob to the right and setting the time, the power will be switched to 600W, and the timer will be activated by rotating the knob to the left. If you stop after the set time and turn the knob to the left again to set the time, it will start at 300.
The power is switched to W, and the timer is activated by rotating the knob to the right and stops after a set time, making it possible to perform all of these operations with a single knob.

In this way, the number of switches and knobs in an even toaster can be reduced, contributing to the simplification of its operation.

[Brief explanation of drawings]

The drawings show an embodiment of the small-sized motor rotation direction selection device according to the present invention.
The figure is an enlarged side view of the main parts, Figure 3 is a half sectional view showing the mutual relationship between the response gear and the sliding ring, Figure 4 is a plan view of the sliding ring, and Figures 5 and 6 are FIG. 3 is an explanatory diagram of the operation of a motor forward rotation selection function part. DESCRIPTION OF SYMBOLS 1...Motor rotor, 3...Main gear, 4...Engaging protrusion, 11...Response gear, 1
2... Sliding ring, 17a-17d...
Engagement arm, 21... Operation shaft (selection means), 32
...Stopper pin.

Claims (1)

[Claims] 1 a main drive gear 3 coaxially directly connected to the motor rotor 1;
Engagement protrusions 4, 4 integrally protrude from the main drive gear 3 at different levels.
, a reaction gear 11 that fits and is adjacent to the main drive gear 3, and a sliding ring 12 coaxially and frictionally connected to the reaction gear 11.
Two engaging arms 17 are provided to protrude from the outer periphery of the sliding contact ring 12 so as to have rotation loci capable of engaging with the engaging protrusions 4, 4.
a, 17_b, and when the motor rotor 1 rotates in the forward rotation direction, the engagement arms 17_a, 17_b engage the engagement protrusions 4, 4.
A stopper pin 32 is provided that engages with the sliding ring 12 to prevent its rotation so as not to engage with the sliding ring 12, and the stopper pin 32 is interlocked with a selection means 21 that selects the rotation direction of the motor rotor 1. A compact device that is connected and configured to be positioned by selecting two positions so that the direction of rotation of the sliding contact ring 12 to be prevented is either clockwise or counterclockwise. Motor rotation direction selection device.