JPH04331850A - Reduction gear - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency of torque and prevent the generation of a large noise, by omitting a complicate output mechanism, by arranging an external gear as output gear coaxially with an input shaft, in an inscribed differential gear type reduction gear. CONSTITUTION:An eccentric body 7 which converts the revolution of a motor to the eccentric revolution around a motor shaft and an external gear 9 which concentrically revolves for the axis center of the motor are installed on the motor shaft 6. An internal gear 8 is fitted with the eccentric body 7, transmitting a self turning force to the external gear 9 in meshed state with the external gear 9 through a revolution movement. A slide block 11 is joined in free slide in the X direction for a fixed base 10. A self turn suppressing mechanism is constituted so that the slide block 11 is joined with the internal gear 8 in free slide in the Y direction and the rotation of the internal gear is suppressed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear type speed reducer used in a speed reduction section of an electric volume control device for volume adjustment in audio equipment or the like.

0002

[Prior Art] Conventionally, as a gear type reducer, (a)
A device using a planetary gear mechanism consisting of a sun gear, a plurality of planetary gears, and an internal gear, (B) Japanese Patent Publication No. 49-36897
As shown in Japanese Patent Application Laid-Open No. 63-145842, etc., there is an eccentric body that converts the rotation of the motor into eccentric rotation around the motor shaft, and an eccentric body that is swung around by the rotation of the eccentric body to give a revolving force. There is a known structure that includes a fixed internal gear that meshes with the external gear and applies rotational force to the external gear, and extracts the rotational force of the external gear as a deceleration output.

0003

[Problem to be solved by the invention] However, the above (a)
According to the planetary gear type, a loud gear noise is generated at the meshing part between the input sun gear and the planetary gear, which are directly connected to the motor shaft and rotate at high speed.

[0004] For this reason, it is particularly unsuitable for use in a reduction section of an electric volume device in high-quality audio equipment where even the slightest noise is a concern.

On the other hand, according to the internal differential gear type (b), since the rotational force of the external gear is generated at a position offset from the input shaft (motor shaft), this force is generated on the same axis as the input shaft. A complicated output mechanism is essential for taking it out.

[0006] Therefore, this output mechanism increases torque transmission loss, resulting in a decrease in output torque. For this reason, in the electric volume control device, there is a risk that the output rotation of the reduction unit may pulsate due to the rotational resistance of the volume adjustment mechanism due to insufficient torque, and the volume adjustment operation may become inaccurate. There was also the problem that power consumption increased due to loss in power transmission.

Furthermore, since vibrations increase in connection with power transmission in the output mechanism, the vibration noise of the entire reducer becomes louder instead of the gear noise mentioned above, and as a result, similar to the planetary gear type, the vibration noise becomes louder in audio equipment, etc. This made it unsuitable for use in the reduction section of an electric volume control device.

[0008] Therefore, the present invention improves the conventional internal differential gear type reducer described above, and allows the external gear, which is the output gear, to be placed coaxially with the input shaft (motor shaft). The present invention provides a reduction gear that can omit a complicated output mechanism, improve torque transmission efficiency, and prevent generation of large noise.

[0009]

[Means for Solving the Problems] The invention of claim 1 includes an eccentric body on the motor shaft that converts the rotation of the motor into eccentric rotation around the motor shaft, and an external gear that rotates concentrically with respect to the motor shaft. An internal gear is provided on the eccentric body, and the internal gear is swung by the eccentric body, and the gear center engages with the external gear to apply rotational force to the gear while performing a revolution movement in which the gear center rotates around the motor axis. A slide block is connected to the fixed base so as to be slidable in the X direction perpendicular to the motor axis, and the slide block and the internal gear are connected to the base so that the slide block can slide in the X direction perpendicular to the motor axis and the X direction. A rotation prevention mechanism that prevents the internal gear from rotating on its own axis is constructed by being coupled so as to be slidable in the Y direction.

[0010] In the invention according to claim 2, in the structure according to claim 1, the base of the rotation prevention mechanism and the slide block, and the slide block and the internal gear each have a convex portion provided on either one, and the convex portion. The two are slidably connected in the X and Y directions by a recess provided on the other side in a slidably engaged state.

[0011] In the invention according to claim 3, in the configuration according to claim 1, the base and the slide block of the rotation prevention mechanism, and the slide block and the internal gear, each have a pin provided on either one, and this pin is slidable. The one end is inserted into the other end and connected to the other end through a pin hole provided in the other end so as to be slidable in the X and Y directions.

0012

[Operation] According to the above configuration, the internal gear performs a revolution movement (oscillating movement that is a compound movement in both X and Y directions) around the motor axis as an input gear, and this movement causes the external gear to rotate around the motor axis. It is transmitted as a concentric rotation.

That is, since the external gear, which is the output gear, rotates coaxially with the motor shaft, the rotational force of the external gear is extracted coaxially with the motor shaft, as in the conventional internal differential gear type reducer. This eliminates the need for a complicated output mechanism.

[0014] Accordingly, loss in power transmission and occurrence of vibration due to the output mechanism are eliminated, so transmission efficiency can be increased and noise of the entire speed reducer can be reduced.

Further, according to the second aspect of the present invention, in which the rotation inhibiting action is performed by the convex portion and the concave portion, the base and the slide block, and the slide block and the internal gear are engaged with each other in the convex portion and the concave portion to move the base and the slide block in the axial direction of the motor. Assembling is easy because all you have to do is line them up.

On the other hand, according to the configuration of claim 3 in which the pin and the pin hole perform the rotation prevention function, since the sliding resistance is smaller than that of the surface sliding type, the rotation prevention mechanism prevents the rotational movement of the internal gear. There is no risk of it becoming a hindrance. Further, since the sliding portion is fixed in position in the motor axial direction by the pin and pin hole, the sliding block etc. is reliably prevented from twisting, so that the X and Y sliding actions are performed more smoothly.

[0017]

[Embodiment] An embodiment of the present invention will be explained with reference to the drawings.

In the following embodiments, a case where the present invention is used in a reduction section of an electric volume device in audio equipment, etc. is taken as an example.

A first embodiment (see FIGS. 1 to 4) 1 is a motor as a driving source, and after the rotational force of this motor 1 is reduced to a low rotational speed suitable for volume adjustment in a reduction unit 2, the clutch is 3 to the volume adjustment mechanism 4. 5
is a volume adjustment shaft for manual operation connected to the volume adjustment mechanism 4 on the opposite side from the clutch 3.

[0020] To explain the configuration of the speed reducer 2, the motor shaft 6
In this case, a cam 7 as an eccentric body is fitted and fixed with its center shifted from the motor shaft center O1 (O2 indicates the cam center in FIG. 1), and the rotation of the motor shaft 6 is converted into eccentric rotation of the cam 7. be done.

An internal gear 8 is rotatably fitted on the outer periphery of the cam 7, and an external gear 9 serving as an output gear rotatably supported on the motor shaft 6 along with the cam 7.
They are constructed so that they mesh together. Note that the relationship between the number of teeth Z1 and Z2 of the internal gear 8 and the external gear 9 is set as Z1 (for example, 41)>Z2 (for example, 39).

A rotation prevention mechanism for inhibiting rotation of the internal gear 8 is provided between the internal gear 8 and the motor casing, which is a fixed portion.

To explain the mechanism, a base 10 is fixed to the motor casing, and a slide block 11 is provided between the base 10 and the internal gear 8.

This slide block 11 has a base 1
Two concave portions 12, 12 are provided on the surface facing the base 10 in a symmetrical arrangement with the motor axis O1 in between, and are orthogonal to the motor axis O1, and two convex portions 13 provided on the base 10.
, 13 is this recess (hereinafter referred to as the X-direction recess) 12,1
2 in a slidable manner.

Furthermore, on the surface of the slide block 11 facing the internal gear 8, two recesses (hereinafter referred to as Y-direction recesses) 14, 1 are perpendicular to the X-direction recesses 12, 12.
4 are provided, and two convex portions 15 provided on the internal gear 8,
15 is slidably engaged with the Y-direction recesses 14, 14.

In this way, the slide block 11 is connected to the base 10 so as to be slidable in the X direction perpendicular to the motor axis O1, and the internal gear 8 is connected to the slide block 11 so as to be slidable in the X direction perpendicular to the motor axis O1 and the X direction. A rotation prevention mechanism is configured by being coupled so as to be slidable in the Y direction.

In this configuration, when the cam 7 is rotationally driven by the motor 1, the internal gear 8 is swung around the motor shaft 6 by the eccentric rotation of the cam 7, and the center of the gear rotates around the motor axis O1. It performs a revolution movement.

In this case, the internal gear 8 is prevented from rotating by the rotation prevention mechanism, and the external gear 9 only performs a revolution motion, that is, a rocking motion that is a compound motion in both the X and Y directions.
mesh with each other. As a result, the external gear 9 moves to the motor axis O at a speed determined by the difference in the number of teeth (Z1-Z2) with the internal gear 8.
Perform a concentric rotation with respect to 1.

In this way, the rotational force of the motor shaft 6 is decelerated and sent from the external gear 9 to the clutch 3, and then transmitted to the volume adjustment mechanism 4 via the transmission plate 16, clutch plate 17, and connection arm 18 of the clutch 3. and volume adjustment is performed. In FIG. 1, 19 is a clutch spring, and 20 is a spring receiver.

Note that the rotational force of the volume adjustment mechanism 4 caused by manual operation of the volume adjustment shaft 5 is not transmitted to the speed reduction section 2 due to the slipping action of the clutch 3.

In this way, while basically adopting an internal differential gear type configuration, the internal gear 8 is used as an input gear, the external gear 9 is used as an output gear, and the input rotation from the motor 1 is transmitted via the cam 7. Since the external gear 9 is configured to rotate coaxially with the motor shaft 6 by transmitting the signal to the internal gear 8 and causing the same gear 8 to perform a revolving motion, the rotation of the external gear 9 can be directly extracted as a deceleration output. It becomes possible.

That is, there is no need for a complicated output mechanism for extracting the rotational force of the internal gear coaxially with the motor shaft, which was essential in the conventional internal differential gear type reducer.

Therefore, (1) there is no power transmission loss due to the output mechanism, so transmission efficiency is improved. For this reason,
For example, the output torque of the reduction unit 2 is
Since the rotational resistance is not sufficiently exceeded, there is no possibility that pulsation will occur in the output rotation and problems such as inaccurate adjustment operations will occur. Furthermore, since the power transmission loss is reduced, power consumption can be reduced.

[0034] Since the vibration in the output mechanism is eliminated, the vibration of the entire deceleration section 2 is reduced. Therefore, the reduction part noise can be reduced, and the commercial value of the electric volume device for high-quality audio equipment can be increased.

On the other hand, as a rotation prevention mechanism for the internal gear 8, the internal gear is Since the internal gear 8 is configured to prevent its rotation on its own axis and allow only its orbital movement, for example, the internal gear 8 and the motor casing are connected by a flexible member or an elastic member, and the torsional rigidity of this connecting member prevents the rotation of the internal gear. (a) There is no risk of twisting due to load torque, and
The rotation prevention effect of the internal gear 8 is ensured. Therefore, the revolution movement of the internal gear 8, that is, the original deceleration effect, is always performed accurately.

(b) Since the base 10 and the slide block 11 are interposed between the motor casing and the internal gear 8, and these are connected by the recesses 12, 14 and the projections 13, 15, the motor axial direction is The thickness dimension can be reduced. For this reason, it is particularly advantageous for installation in a volume device of equipment such as recent audio equipment, which requires compactness and is subject to restrictions on installation space.

(c) Since it is a rigid X and Y sliding connection, there is no risk of local fatigue or damage, and it has excellent durability.

Furthermore, according to the configuration of this rotation prevention mechanism,
Base 10, slide block 11, internal gear 8 during assembly
Assembling is extremely simple because all that is required is to line them up in sequence in the direction of the motor axis.

Second Embodiment (See FIGS. 5 and 6) The second embodiment differs from the first embodiment only in the structure of the rotation prevention mechanism.

To explain only the differences, the base 10 has a pin 21 instead of the convex part 13 of the first embodiment, and the slide block 11 has a pin into which the pin 21 is slidably inserted instead of the X-direction recess 12. The holes 22 are respectively connected to the motor shaft 6.
These pins 21 and pin holes 22 allow the slide block 11 to be attached to the base 1.
0 in the X direction.

Similarly, the slide block 11 and the internal gear 8 are also connected by pins 23 and pin holes 24 so as to be slidable in the Y direction. 25 is a bracket on the internal gear 8 side in which a pin hole 24 is provided.

The configuration of this second embodiment also provides basically the same effects as those of the first embodiment.

[0043] Furthermore, by using the pin slide structure in the rotation prevention mechanism as described above, the slide resistance can be minimized compared to the case of surface sliding.
There is less loss in power transmission, and there is no fear that the rotation prevention mechanism will interfere with the revolution movement of the internal gear 8.

Furthermore, the sliding portion is fixed in position in the motor axial direction by the pins 21, 23 and pin holes 22, 24, and the sliding block 11 etc. are reliably prevented from twisting, so the X and Y sliding action becomes smoother. It is done.

Other Embodiments (1) According to the present invention, the rotational force of the external gear 9 can be directly extracted as a reduction output, and the above embodiment also has such a configuration, but depending on the application, the reduction ratio may be further increased. If desired, the rotational force of the external gear 9 may be secondarily reduced by a spur gear mechanism. Even in this case, it is possible to omit the output mechanism for correcting the positional deviation between the rotation center of the external gear and the motor shaft center, which was necessary in the conventional internal differential gear type reducer. There is no difference in the fact that loss and vibration can be reduced.

(2) In the above embodiment, the cam 7 is fitted and fixed to the motor shaft 6 to form an eccentric body. However, the cam 7 can also be formed as an eccentric body by integrally forming a flange-like convex part on the motor shaft 6 itself. good.

(3) When the rotation prevention mechanism adopts the configuration of the first embodiment in which the concave portion and the convex portion are slidably engaged, the concave portion is formed into a V-groove shape or a dovetail groove shape, and the convex portion is made to correspond to this. It may also be shaped like this.

[0048] Furthermore, as the rotation prevention mechanism, another structure that performs the same XY movement as that mentioned in the first and second embodiments and has basically the same effects as both embodiments may be used. may be adopted.

(4) In the above embodiments, the reduction unit of an electric volume device used in audio equipment etc. was cited as a suitable example of the reduction gear of the present invention, but the reduction gear of the invention can of course be used in various other applications. It can be applied to

[0050]

[Effects of the Invention] As described above, according to the present invention, the configuration is basically an internal differential gear type, but the internal gear is used as an input gear, and the external gear is used as an output gear, and the input rotation from the motor is Since the external gear is configured to rotate on the same axis as the motor shaft by transmitting the signal to the internal gear via an eccentric and causing the gear to revolve, the rotation of this external gear can be directly extracted as a deceleration output. It becomes possible.

That is, there is no need for a complicated output mechanism for extracting the rotational force of the internal gear coaxially with the motor shaft, which was essential in the conventional internal differential gear type reducer.

[0052] Accordingly, loss in power transmission and occurrence of vibration due to the output mechanism are eliminated, so transmission efficiency can be increased and noise of the entire speed reducer can be reduced.

Further, according to the invention of claim 2, in which the rotation inhibiting action is performed by the convex portion and the concave portion, the base and the slide block, and the slide block and the internal gear are engaged with each other in the convex portion and the concave portion to move the base and the slide block in the axial direction of the motor. Assembling is easy because all you have to do is line them up.

On the other hand, according to the third aspect of the invention in which the pin and the pin hole perform the rotation prevention function, since the sliding resistance is smaller than that of the surface sliding type, the rotation prevention mechanism prevents the rotational movement of the internal gear. There is no risk of it becoming a hindrance. Further, since the sliding portion is fixed in position in the motor axial direction by the pin and pin hole, the sliding block etc. is reliably prevented from twisting, so that the X and Y sliding actions are performed more smoothly.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing a first embodiment of the present invention.

FIG. 2 is a partially sectional side view taken in a direction perpendicular to FIG. 1;

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a partially exploded perspective view of the same embodiment.

FIG. 5 is a partially sectional side view showing a second embodiment of the present invention.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5;

[Explanation of symbols]

1 Motor 6 Motor shaft 7 Cam 8 as an eccentric body Internal gear 9 External gear 10 Base 11 that constitutes the rotation prevention mechanism Slide blocks 12, 14 Concave portions 13, 15 Convex portions 21, 23 Pins that constitute the rotation prevention mechanism 22, 24
Same pin hole

Claims (3)

[Claims] Claim 1: An eccentric body that converts rotation of the motor into eccentric rotation around the motor shaft, and an external gear that rotates concentrically with the motor axis are provided on the motor shaft, and the eccentric body has an internal gear. is swung around by an eccentric body, and the center of the gear rotates around the motor axis, engaging with the external gear and applying rotational force to the gear, and is then fixed. A slide block is coupled to the base so as to be slidable in the X direction perpendicular to the motor axis, and the slide block and the internal gear are coupled to the base so as to be slidable in the Y direction perpendicular to the motor axis and the X direction. 1. A speed reducer comprising a rotation prevention mechanism configured to prevent rotation of an internal gear. 2. The reducer according to claim 1, wherein the base of the rotation prevention mechanism and the slide block, and the slide block and the internal gear each have a convex portion provided on either one, and the convex portion is slidable. What is claimed is: 1. A speed reducer characterized in that the speed reducer is coupled to a recess provided on the other side so as to be slidable in the X and Y directions while being engaged with the other side. 3. In the reduction gear according to claim 1, the base of the rotation prevention mechanism and the slide block, and the slide block and the internal gear each have a pin provided on one of them, and the pin is slidably fitted into the pin. 1. A speed reducer characterized in that the speed reducer is connected to a pin hole provided on the other side so as to be slidable in the X and Y directions.