JPH03212904A - motor drive variable resistor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

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

Figure 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 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 41 of the motor 4, and an upper plate 2b extending perpendicularly from the side plate 2a.
and a lower plate 2d, the upper plate 2b is provided with a support portion 2C bent at a substantially right angle at the end thereof, a notch engagement recess 2C' is formed in this support portion, and the lower plate 2c is bent at a right angle. Similarly, notch 2 (1') is provided in 2d, and 8°10 is a column having heads 8+a and IC1&, respectively, and this column 8,
1o is a hole 2g of the frame body 2, respectively.

2h, and further insert the tubular spacers 9 and 11 respectively, and their tips are inserted into the corresponding holes 1a and 1b of the mounting plate 1, and then fixed by tightening etc., and the frame 2 and the mounting plate 1 are connected. are combined.

Reference numeral 15 denotes screws that are inserted into the two small holes on the upper and lower sides of the frame 2 and screwed into the small holes 4b corresponding to the motor to fix the motor 4 to the frame 2. 12 is a first gear body with one end 12
C is engaged with the notch 2 in the bottom plate 2d of the frame 2, and the other end 12d is inserted into the small hole 21 in the top plate 2b of the frame, with the gear 12b meshing with the worm gear 4a of the motor 4. It is rotatably supported between the upper and lower surface plates 2b and 2 holes of the frame. 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 130 is supported in the notch recess 2c/ provided in the support part 2C of the frame, and the spacer 11
As shown in FIG. 8, one end of the spring 14 wound around the spring 14 is constantly pressed inward to prevent it from coming out. In this state, the gear portion 13& of the second gear body 13 meshes with the gear portion 121L of the first gear body 12, and furthermore, the gear portion 13b meshes with the drive gear 6 attached to the operating shaft 31L of the variable resistor 3. .

Referring to FIG. 6, the details of the mechanism of the drive gear 6 and the disc-shaped drive body 6 made of synthetic resin or the like that is in the recess 6 & on the back surface and frictionally engages with the drive gear 6 will be explained.
A spacer 6a of the driver 6 is fitted on the back side of the mounting plate 1 to the operating shaft 3&, and the tip 3b of the operating shaft 3 is fitted with the
A speed nut 28 is press-fitted so that the drive body 6 is rotatably attached to the operating shaft 3. Further, a coil spring 7 is stretched between the drive gear 6 and the mounting plate 1 to achieve frictional engagement between the drive body 6 and the drive gear 6.

Next, to explain the operation of the motor-driven variable resistor mentioned above,
When the motor 4 rotates, this rotation causes the worm gear 42
L, first gear body 12. The signal 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, rotates the operating shaft 3a of the variable resistor 3, and changes the resistance value of the variable resistor 3.

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

Problems to be Solved by the Invention However, the above-mentioned conventional motor-driven variable resistor
The structure of the drive unit is complex, making it difficult to reduce costs, and due to variations in component dimensions and combinations, characteristics may vary.
There was a problem with the occurrence of slippage.

Means for Solving the Problems The present invention comprises a gear having internal teeth attached to an operating shaft provided in a volume, a cylindrical gear having elasticity and teeth on the outer and inner peripheries, and a planetary gear attached to the cylindrical gear. It is equipped with a pinion gear attached to a motor shaft that meshes with the cylindrical gear, and a friction plate that holds the cylindrical gear and smoothes the rotation of the cylindrical gear.

Function: With the above structure, a large reduction ratio can be obtained with a simple structure, the number of parts and assembly steps can be reduced, and the quality can be improved because there is no change in characteristics depending on the combination.

Embodiment The present invention will be explained using a motor-driven variable resistor as an embodiment shown in FIGS. 1 to 3.

FIG. 1 is an exploded perspective view illustrating the main parts of the motor-driven variable resistor, FIG. 2 is a side sectional view of the same parts, 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 connected to the resistor 1 by the stud 181L.
7 and attached to the case 16. Reference numeral 19 denotes a brush mounting plate, which is connected to the operating shaft 1 at one end 152L of the operating shaft 15.
6.

Reference numeral 19b is a brush dowel to which the brush 27 is attached. A pinion gear 29 is press-fitted into the shaft 262LK of the motor 26.

Cylindrical gear 20 made of elastic urethane rubber, etc.
By means of the planetary gear 23 provided between the internal teeth 20b of the cylindrical gear 20 and the pinion gear 29, the portion of the cylindrical gear 2o that engages with the planetary gear 23 expands outward to form a convex portion 20C. However, the external teeth 202L of the cylindrical gear 2° at the convex portion 20C mesh with the internal teeth 192L of the brush mounting plate 19.

Note that the internal teeth 20b of the cylindrical gear 2o mesh with the gear portion 21iL of the friction gear 21. Furthermore, the friction gear 21
is engaged with the cylindrical portion 24& of the motor mounting bracket 24, and the rotational torque is maintained large with grease or the like. 2
Reference numeral 6 denotes a screw that connects the motor 26 and the motor mounting bracket 24, and the motor mounting bracket 24 and the case 16 are connected by a caulking portion 24b.

Next, to explain the operation when the motor 26 rotates, when the motor shaft 26+a rotates, the pinion gear 29 rotates, and the planetary gear 23, which is meshed with the internal teeth 20b of the cylindrical gear 2Q, rotates around the pinion gear 29. Exercise. At this time, the cylindrical gear 2o is meshed with the friction gear 21, and the rotational torque of the friction gear 21 is sufficiently large so that it does not rotate. Due to the planetary motion of the planetary gear 23, the elastic convex portion 20C of the cylindrical gear 20 sequentially moves, and the external teeth 20a of the cylindrical gear 20 and the brush mounting plate 1
The meshing position of the internal teeth 19& of 9 moves. At this time, for example, if the number of teeth of the external teeth 20+& of the cylindrical gear is set to 100, and the number of teeth of the internal teeth 19& of the brush mounting plate is set to 101, then the internal teeth of the brush mounting plate will be 1 per circumference of the planetary gear. The teeth shift, and during this time a deceleration of 1/1oQ is obtained, and the brush 27 attached to the brush mounting plate slides on the resistor 17.
This allows the resistance value to be varied. In addition, pinion gear 29
The number of teeth of the cylindrical gear 2o is 10, and the number of teeth of the internal teeth 20b of the cylindrical gear 2o is 40.
If set to , the child will be decelerated between the moving speed of the motor shaft 26a and the convex portion 20C of the cylindrical gear 2o, and a total deceleration of 1/60o can be obtained.

Next, the operation when manually operating the operating shaft will be described. When the operating shaft 16 is rotated, the brush mounting plate 19 tends to rotate. At this time, the planetary gear 23 causes the convex portion 20C of the cylindrical gear 20 to
Since the external teeth 20a of the cylindrical gear 20 are partially engaged with the external teeth 20a of the cylindrical gear 20, the cylindrical gear 20 and the friction gear 21 also rotate.
41L has a sufficiently heavy rotational torque, so that a good operating feeling can be obtained when operating the operating shaft 15.

Effects of the Invention As is clear from the above embodiment, the present invention uses a cylindrical gear with elasticity to achieve a large reduction ratio with a small number of parts, thereby reducing component materials and assembly man-hours. Since the axis can be placed on the time line, space is reduced, and the degree of freedom in mounting to the set is improved.The use of elastic gears absorbs variations in individual parts, making it possible to create a motor-driven variable resistor with less variation in characteristics. This is something that can be provided.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view illustrating the main parts of a motor-driven variable resistor that is an embodiment of the present invention, Fig. 2 is a side sectional view of the same part, and Fig. 3 is a perspective view of the finished product. , FIG. 4 is an exploded perspective view of a conventional motor-driven variable resistor, FIG. 6 is a sectional view of the same side, and FIG. , FIG. 7 is an explanatory diagram illustrating the driving section which is the main part.

Claims (4)

[Claims] (1) A variable resistor, a gear with internal teeth attached to the operating shaft of the variable resistor, an elastic cylindrical gear with gear parts on the outer and inner peripheries, and a gear with the internal teeth. a planetary gear formed with a convex portion on the cylindrical gear so that the gear portion on the outer periphery of the cylindrical gear meshes with the cylindrical gear; a pinion gear attached to the motor shaft that meshes with the cylindrical gear via the planetary gear; and a pinion gear that supports the cylindrical gear. A motor-driven variable resistor consisting of a supporting member. (2) The motor-driven variable resistor according to claim 1, wherein the cylindrical gear is made of urethane rubber. (3) The motor-driven variable resistor according to claim 1, wherein the support member is a friction gear that meshes with the cylindrical gear and a motor mounting bracket that engages with the friction gear. (4) The motor-driven variable resistor according to claim 1, wherein the brush mounting plate of the variable resistor is provided with internal teeth to form an internal gear.