JPH03222401A - Motor-driven variable resistor - Google Patents

Abstract

PURPOSE:To obtain a large reduction gear ratio in simple structure and reduce components materials and assembling cost by providing an internal gear mounted with an operation shaft and its opposite internal gear, planet gear and a gear engaged with said planet gear. CONSTITUTION:A friction gear 21 and a brush mounting board 19 are slight different from each other in the number of teeth, which produces rotating deviation. For example, when it is assumed that the tooth number of the friction gear is 100 while the tooth number of the brush mounting board is 101, one turn of the planet gear 23 will be deviated by one tooth, thereby providing the reduction of 1/100. If the tooth number of an opinion gear 29 is assumed to be 20, the rotation of the planet gear 23 will be reduced to 1/6 of the rotation of a motor shaft 26a, thereby obtaining a total reduction of 1/600. At the same time, friction gear 21 has enough heavy rotating torque with a motor mounting fitting 24. Therefore, it is possible to obtain favorable operation feeling, which makes it possible to provide large reduction in simple structure and reduce component materials and assembling cost as well.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a motor drive variable resistor suitable for motor drive and manual remote control mainly used in audio equipment.

Conventional technology The conventional technology will be explained with reference to FIGS. 4 to 7.

FIG. 4 is an exploded perspective view of the motor-driven variable resistor.
FIG. 5 is a side view of the same, FIG. 6 is a partial cross-sectional view illustrating a friction drive section that is the same essential part, and FIG. 7 is an explanatory diagram illustrating the drive section that is the same essential part.

According to the figure, reference numeral 1 denotes a mounting plate disposed facing the frame 2, and a rotary water variable resistor 3 having an operating shaft 3a is mounted on this mounting plate 1, and the tip of the operating shaft 3a is A drive gear 5 is loosely fitted through a coil spring 7, and a drive body 6, which will be described later, is attached to the back of the gear. The frame 2 also has a side plate 2a provided with a hole 2f in the center for inserting the worm gear 4a of the motor 4, and an upper plate 2b extending vertically from the side plate 2a.
A supporting portion 2c is provided at the end of the upper surface plate 2b and is bent at a substantially right angle, and a notch engagement recess 2c' is formed in this supporting portion. Similarly, notches 2d' are provided in the columns 8 and 10, and columns 8 and 10 have heads 8a and 10a, respectively, and these columns 8 and 10 are inserted into holes 2g and 2h of the frame 2, respectively, and are further fitted with tubular spacers 9 and 11. Insert each, and the tip of each is attached to the mounting plate 1.
After being inserted into the corresponding holes 1a and 1b, the frame body 2 and the mounting plate 1 are fixed by tightening or the like. 15
Screws b are inserted into the upper and lower small holes 2j of the frame 2 and are screwed into the corresponding small holes 4b of the motor to fix the motor 4 to the frame 2. 12 is a first gear body with one end 12c
is engaged with the notch 2d' of the lower plate 2d of the frame 2, the other end 12d is inserted into the small hole 2L of the upper plate 2b of the frame, and the gear 12b is engaged with the worm gear 4a of the motor 4. It is rotatably supported between the upper and lower plates 2b and 2d of the body. 13 is a second gear body, one end 13d of which is supported in the small hole 21 of the frame 2, the other end L3c is supported in the notch recess 2c' provided in the support part 2c of the frame, and is wound around the spacer 11. As shown in FIG. 8, one end of the spring 14 is constantly pressed inward to prevent the spring from coming out. In this state, the gear portion 13a of the second gear body 13 meshes with the gear portion 12a of the first gear body 12, and the gear portion 13b further meshes with the gear portion 12a of the first gear body 12.
It meshes with the drive gear 5 attached to the operating shaft 3a of the variable resistor 3.

Referring to FIG. 6, the details of the mechanism of the drive gear 5 and the disc-shaped drive body 6 made of synthetic resin or the like that resides in the recess 5a on the back surface and frictionally engages with the drive gear 5 will be explained. A spacer 6a of the driving body 6 is fitted onto the shaft 3a on the back surface of the mounting plate 1, and a speed nut 28 is press-fitted into the tip 3b of the operating shaft 3, allowing the driving body 6 to rotate. mounted on. Also, drive gear 5 and mounting plate 1
A coil spring 7 is stretched between them to achieve frictional engagement between the drive body 6 and the drive gear 5.

Next, to explain the operation of the motor-driven variable resistor mentioned above,
When the motor 4 rotates, this rotation causes the worm gear 4
a, first gear body 12. This is transmitted to the second gear body 13, and the drive gear 5 is rotated by the gear portion 13b. Therefore, the drive body 6 that is frictionally engaged with this rotates at the same time, and the variable resistor 3
The resistance value of the variable resistor 3 is varied by rotating the operation shaft 3a of the variable resistor 3.

When manually varying the resistance value of the variable resistor, a slip is generated between the drive gear 5 and the drive body 6 by rotating the operating shaft 3a, and the torque of the variable resistor 3 and the drive gear 5. Frictional resistance with the driving body 6 is added, and the resistance value of the variable resistor can be varied while providing a feeling of appropriate rotational torque.

Problems to be Solved by the Invention However, the above-mentioned conventional motor-driven variable resistor
The structure of the drive section is complicated, making it difficult to reduce costs, and there are also problems in that characteristics vary due to variations in component dimensions and how they are combined.

Means for Solving the Problems The present invention provides an internal gear attached to an operating shaft provided in a variable resistor, an internal gear provided opposite to the internal gear, and two internal gears. It is equipped with a planetary gear that meshes with the gears at the same time, and a gear attached to the motor shaft that meshes with the planetary gears.

Effect: With the above configuration, a large speed reduction ratio can be obtained with a simple structure, and parts materials and assembly man-hours can be reduced.

Embodiment The present invention will be explained using a motor-driven variable resistor as an embodiment shown in FIGS. 1(a) to 3. FIG. Fig. 1(a) is an exploded perspective view illustrating the main parts of the motor-driven variable resistor, and Fig. 1(b) is a perspective view illustrating the state of the internal teeth after the brush is attached, which is the main part. 2 is a sectional view of the same side, and FIG. 3 is a perspective view of the completed product.

According to the figure, reference numeral 15 denotes an operating shaft, which is supported by a bearing portion 16a provided in a part of the case 16. 17
is a resistor, and the terminal 18 is fastened to the resistor by a stud 18a and attached to the case 16. A brush mounting plate 19 has an internal gear and is attached to the shaft 15 at one end 15a thereof. The internal toothed friction gear 21 is attached to the brush mounting plate 19.
The cylindrical portion 2 of the motor mounting bracket 24 is provided facing the cylindrical portion 2 of the motor mounting bracket 24.
4a, and the rotational torque is maintained high with grease or the like. Reference numeral 23 denotes a planetary gear made of an elastic material such as elastomer, which meshes with the brush mounting plate 19 and the friction gear 21 at the same time, and also moves planetarily between the pinion gear 29 attached to the shaft 26a of the motor 26. Further, the motor mounting bracket 24 and the case 16 are connected by a shark-like portion 24b.

In addition, since the planetary gear 23 is formed of an elastic body, manufacturing errors of the internal gear and the friction gear 21 of the brush mounting plate 19 can be absorbed.

Next, the operation when the motor rotates will be described. As the motor shaft 26a rotates, the pinion gear 29 attached to the motor shaft 26a rotates, and the planetary gear 23 meshed with the pinion gear 29 performs planetary motion. The planetary gear 23 meshes with the friction gear 21 and the brush mounting plate 19 at the same time on the outside. At this time, since the friction gear 21 and the brush mounting plate 19 have slightly different numbers of teeth, rotational deviation occurs. For example, if the number of teeth of the friction gear 21 is 100 and the number of teeth of the brush mounting plate 19 is 101, there will be a shift of one tooth for one circumference of the planetary gear 23, and a deceleration of 1/100 will be obtained. At this time, the rotational torque of the friction gear 21 does not rotate sufficiently.

Also, if the number of teeth of the pinion gear 29 is 20, the planetary gear 2
The rotation of 3 is a 1/6 deceleration with respect to the rotation of the motor shaft 26a, and a total deceleration of 1/600 can be obtained.

Next, the operation when manually operating the operating shaft 15 will be explained. When the operating shaft 15 is rotated, the brush mounting plate 19 is rotated. At this time, the planetary gear 23 and the friction gear 21 also rotate at the same time, but since the friction gear 21 has a sufficiently heavy rotational torque with the motor mounting bracket 24, a good operating feeling can be obtained when operating the operating shaft 15. .

Effects of the Invention As is clear from the above embodiments, the present invention includes an internal gear mounted on an operating shaft, an internal gear provided opposite to the internal gear, and a planetary gear meshing with the two internal gears. A large reduction ratio can be obtained with a simple configuration consisting of the above planetary gear and a gear attached to the motor shaft that meshes with the planetary gear, which reduces component materials and assembly man-hours, and allows the operation shaft and motor shaft to be placed on the line between the road and the road. Since it can be arranged, space is also reduced, and the degree of freedom in mounting to the set can be improved.

[Brief explanation of drawings]

FIG. 1(a) is an exploded perspective view illustrating the main parts of a motor-driven variable resistor that is an embodiment of the present invention.
Figure (b) is a perspective view illustrating the state of the internal teeth of the brush mounting plate, which is the main part, Figure 2 is a sectional view of the same side, Figure 3 is a perspective view of the finished product, and Figure 4 The figure is an exploded perspective view of a conventional motor-driven variable resistor, FIG. 5 is a sectional view of the same side, FIG. The figure is an explanatory diagram illustrating the driving section, which is the main part. 15...Operating axis, 16...Case, 1
9... Brush mounting plate, 21... Friction gear, 23 Old... Planetary gear, 26... Motor,
26a...Motor shaft, 29...Pinion gear.

Claims (3)

[Claims] (1) At least a variable resistor, an internal gear attached to the operating shaft of this variable resistor, another internal gear provided opposite to the internal gear, and the two internal gears at the same time. A motor-driven variable resistor consisting of a planetary gear that meshes with the planetary gear, and a gear that meshes with the planetary gear and is attached to the motor shaft. (2) The motor-driven variable resistor according to claim 1, wherein the planetary gear is made of an elastic material such as an elastomer. (3) The motor-driven variable resistor according to claim 1, wherein an internal gear is provided on the brush mounting plate attached to the operating shaft.