JP2000274495A - 3k type strange planetary gear speed reduction mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with a problem of vibration and noise by forming an internal gear of two parts of an internal gear and an internal gear holding spacer for holding this internal gear, and changing a spur gear and a helical gear by replacing the internal gear. SOLUTION: A shaft 4 is inserted into a central hole of a planetary gear B3, and both ends are sandwiched by intermediate plates 5, 6 to constitute a planetary gear unit. An internal gear D7 is fixed to a motor 1 by an internal gear holding spacer 8 fitted to this internal gear. An internal gear C9 rotating by being driven by the motor 1, an output shaft 10 and a gear cover 11 for pressing down the internal gear C9 are provided. Since an installing method is restricted by an upper side gear, there is no fear of falling-off, so that screw fastening is not performed, and recess/projection shape fitting is performed. A spur gear and a helical gear can be changed by replacing the internal gear D7 to solve a problem of noise and vibration, and a flame retardant material is used for the internal gear holding spacer 8 of a separate part to cope even with heating of the motor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a 3K type mysterious planet used in a sorter drive of a copying machine or a drive of a bed elevating machine, which has a high reduction ratio and cannot rotate in reverse under a load applied from the output side. The present invention relates to a gear reduction mechanism.

[0002]

2. Description of the Related Art As shown in FIG. 5, a 3K type mysterious planetary gear reduction mechanism includes an input gear A, a planetary gear B, and internal gears C and D, and a reduction ratio can be expressed by the following equation. C and D require a difference in the number of teeth, and the smaller the difference in the number of teeth, the greater the reduction ratio. Reduction ratio U = [(1 + zD / zA) / (1-zD / z
C)] Input gear A Number of teeth (zA) Internal gear C Number of teeth (zC) Internal gear D Number of teeth (zD)

[0003]

(1) The 3K type mysterious planetary gear reduction mechanism has a drawback in that problems such as vibration and noise tend to occur because the structure is more complicated than that of a normal gear reduction mechanism. (2) Although the 3K type mysterious planetary gear reduction mechanism can obtain a high reduction ratio, it is necessary to introduce a difference in the number of teeth without greatly changing the meshing center distance between the gears. Since the number of teeth is limited by the number of planetary gears, there is a disadvantage that the reduction ratio cannot be freely changed.

[0004]

(1) An internal gear D of a 3K type mysterious planetary gear reduction mechanism (FIG. 1) and an internal gear D (7) and an internal gear holding spacer which holds the internal gear D and serves as a spacer for a motor. (8) -2
The internal gear D can be replaced as a part. In this way, the spur gear and the helical gear can be changed as required, and it is possible to cope with problems such as vibration and noise, and the internal gear D has a small friction and a good slidability. As a measure against heat generation of the motor, a flame retardant material can be separately selected for the spacer.

(2) As shown in FIG. 3, by inserting a gear reduction mechanism in front of the 3K type mysterious planetary gear reduction mechanism, it is possible to make the reduction ratio variable without changing the 3K type mysterious planetary gear reduction mechanism. In addition, since the rotation speed of the input gear A of the 3K type mysterious planetary gear reduction mechanism can be made lower than the rotation speed of the drive source, vibration and noise can be reduced. Pinion of gear 2 (1
5) is the input gear A of the 3K type mysterious planetary gear reduction mechanism, which is a fixed part because it does not change.
Can be changed, and the reduction ratio in this case is as follows.

Reduction ratio U = [(1 + zD / zA) / (1-
zD / zC)] × W W = arbitrary reduction ratio Input gear A Number of teeth (zA) Internal gear C Number of teeth (zC) Internal gear D Number of teeth (zD)

[0007]

(Embodiment 1) FIG. 1 shows an embodiment of a 3K type mysterious planetary gear reduction mechanism. In FIG. 1, reference numeral 1 denotes a drive source, a motor, 2 a motor pinion, and 3 a planetary gear B (three in this embodiment). 4 is a shaft, and 5 and 6 are intermediate plates. The shaft 4 is inserted into the center hole of the planetary gear B, and the both ends are sandwiched between the intermediate plates 5 and 6 to form a planetary gear unit. Reference numeral 7 denotes an internal gear D, and reference numeral 8 denotes an internal gear holding spacer fitted to the internal gear D and fixed to the motor. Reference numeral 9 denotes an internal gear C that rotates following a drive source, reference numeral 10 denotes an output shaft, and reference numeral 11 denotes a gear cover that holds the internal gear C.

As shown in FIG. 2, the internal gear D is fitted into the internal gear holding spacer, and the mounting method is restricted by the upper gear, so there is no risk of falling off. Make a fit. If the internal gear D can be replaced in this way, the spur gear and the helical gear can be changed due to problems such as vibration and noise. A flame-retardant material is selected for the internal gear holding spacer in consideration of heat generated from the motor.

(Embodiment 2) FIG. 3 shows an embodiment in which a two-stage gear reduction mechanism is provided before the 3K-type mysterious planetary gear reduction mechanism. The 3K type mysterious planetary gear reduction mechanism is substantially the same as that of FIG. 1, but in FIG. 3, reference numeral 12 denotes gear 1, 13 denotes the shaft of gear 1, 14 denotes the gear of gear 2, 15 denotes the pinion of gear 2, and 16 denotes the pinion of gear 2. The shaft of the gear 2, 17 is a spacer, and 18 is an internal gear holding spacer. The internal gear holding spacer is considered to be the same as the internal gear D since it is considered that the internal gear D is not changed. However, in consideration of the common use of the parts shown in FIGS. I have.

The pinion of the gear 2 serves as the input gear A of the 3K-type mysterious planetary gear reduction mechanism, and is a fixed part because it does not change. However, the gear of the gear 2 is a separate part so that it can be changed. Was composed of two parts as shown in FIG. The assembling method is to fit the pin on the pinion side with the hole on the gear side.

Although the gear 1 is sandwiched between the upper and lower sides, the gear 2 keeps space, so it is necessary to hold down the gear and to hold it out.
Further, it is necessary to take measures against the removal of the shaft which is the axis. Therefore, as shown in FIG. 4, the gear is held in the falling direction by the diameter of the center hole of the internal gear holding spacer, and is held by the rib of the gear 2 in the vertical direction. To prevent the gear 2 from coming off the shaft, the tip of the center hole of the gear 2 is used as a wall to prevent the gear 2 from coming off.

A calculation example of a 3K type mysterious planetary gear reduction mechanism with a variable reduction ratio will be described below. Example 1 Internal gear C Number of teeth 36 Internal gear D Number of teeth 33 Motor pinion Number of teeth 14 Number of gear teeth of gear 1 21 Number of pinion teeth of gear 1 14 Number of gear teeth of gear 2 28 Number of pinion teeth of gear 2 12 In this case, the reduction ratio is: reduction ratio U = [(1 + 33/12) / (1−33 / 3)
6)] × 21/14 × 28/14 = 135.

Example 2 Internal gear C Number of teeth 36 Internal gear D Number of teeth 33 Motor pinion Number of teeth 12 Number of gear teeth of gear 1 20 Number of pinion teeth of gear 1 12 Number of gear teeth of gear 2 24 Number of pinion teeth of gear 2 12 In the case of the above example, the reduction ratio is the reduction ratio U = [(1 + 33/12) / (1−33 / 3)
6)] × 20/12 × 24/12 = 150. As in Examples 1 and 2, the reduction ratio can be varied by changing the number of teeth of the preceding gear reduction mechanism, and the rotation speed of the input gear A is lower than the rotation speed of the drive source, so that vibration and noise are reduced. Can be reduced.

[0014]

As described above, (1) by making the internal gear D replaceable, the spur gear and the helical gear can be changed, so that the problem of noise and vibration can be solved, and the internal gear D becomes a separate part. By using a flame retardant material for the gear holding spacer, it is possible to cope with the heat generated by the motor. (2) By combining a gear reduction mechanism in front of the 3K-type mysterious planetary gear reduction mechanism, the reduction ratio can be changed without changing the 3K-type mysterious planetary gear reduction mechanism, and costs such as die investment can be reduced. Further, since the rotation speed of the input gear A is lower than the rotation speed of the drive source, vibration and noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an internal gear D according to the present invention, which can be changed.
It is a figure explaining an example of a K type mysterious planetary gear reduction mechanism.

FIG. 2 is a diagram illustrating an internal gear D and an internal gear holding spacer according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating an embodiment of a 3K type mysterious planetary gear reduction mechanism of the present invention in which the reduction ratio is variable.

FIG. 4 is a diagram for explaining a gear 2 according to the embodiment of the present invention and holding thereof.

FIG. 5 is a diagram illustrating a 3K type mysterious planetary gear reduction mechanism of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 motor 2 motor pinion 3 planetary gear B 4 shaft 5 intermediate plate 6 intermediate plate 7 internal gear D (fixed internal gear) 8 internal gear holding spacer 9 internal gear C (driven internal gear) 10 output shaft 11 gear cover 12 gear 1 13 Shaft 14 Gear 2 Gear 15 Gear 2 Pinion 16 Shaft 17 Spacer 18 Internal Gear Holding Spacer

Continued on the front page (72) Inventor Kei Akamatsu 2-4-19 Nakane, Meguro-ku, Tokyo F-term in Canon Seiki Co., Ltd. (reference) 3J027 FA11 FA17 FB24 GA01 GA03 GB03 GC13 GC24 GC26 GC28 GD04 GD07 GD12 GE01 GE11 GE26 GE29 5H607 AA04 AA12 BB01 CC03 DD03 DD19 EE33

Claims (4)

[Claims] 1. A 3K type mysterious planetary gear reduction mechanism wherein the internal gear is replaceable. 2. A 3K type mysterious planetary gear reduction mechanism characterized in that a gear reduction mechanism is combined with a preceding stage of the 3K type mysterious planetary gear reduction mechanism. 3. A 3K type mysterious planetary gear reduction mechanism, comprising: an input gear disposed at a center and rotated; a planetary gear disposed around the input gear and driven by the input gear; A fixed internal gear that is fixedly disposed around and holds the planetary gear between the input gear and regulates the rotation of the planetary gear; and is disposed coaxially with the fixed internal gear around the planetary gear. A driven internal gear driven by the planetary gears; a gear cover that covers the driven internal gear; and an internal gear holding portion that detachably holds the fixed internal gear and that is detachable from the gear cover. And a 3K type mysterious planetary gear reduction mechanism characterized by having: 4. The 3K type mysterious planetary gear reduction mechanism according to claim 3, wherein the spacer is detachably disposed at a distance from the inner gear holding spacer, and the input gear is retained by the spacer. 3K, further comprising: a gear for detachably holding a (pinion); and another gear reduction mechanism held between the internal gear holding spacer and the spacer to drive the gear. Type wonder planetary gear reduction mechanism.