JPS62288765A - Reduction gear - Google Patents

Abstract

PURPOSE:To obtain the correct revolution restoration position and obtain the small-sized device at a low cost by setting an elastic belt, e. g., timing belt into the meshing part of a power transmission gear. CONSTITUTION:When a cylindrical coupling is driven, a driving toothed pulley 1 turns, and a timing belt 5 is operated. Since the driving toothed pulley 1 has a number of meshing teeth, the timing belt 5 operates at the same time. Since planetary toothed pulleys 2 3, and 4 press-contact an internal peripheral teeth 6, keeping the timing belt 5 therebetween, the teeth on the front and back surfaces of the timing belt 5 are sufficiently meshed, and a rotary body is turned simultaneously with the operation of the timing belt 5, and an output shaft is turned. Therefore, the gap between the meshing part is removed, and the backlash in the conversion between the normal and reverse revolution is eliminated, and the correct revolution restoration position can be obtained, and each axis center of the driving input and output can be set on a same axis center, and the small-sized device can be obtained at a low cost.

Description

[Detailed Description of the Invention] 8. Detailed Description of the Invention (Industrial Application Field) Used in the part where the rotation needs to be decelerated in the rotation transmission of the device, and accurate position restoration is required especially when performing forward and reverse rotation. This relates to equipment that requires a reduction gear without backlash.

(Prior technology) Conventional speed reducers are gear reducers, planetary type with rollers,
There is a planetary system that uses elasticity to bite, a yuri system that uses frictional conduction, etc., but in both of them, rotation is transmitted through direct contact between rigid bodies.

(Problems to be Solved by the Invention) In the case of gear meshing or transmission using rollers, it is difficult to eliminate backlash, and in the case of elastic transmission and frictional transmission, it is difficult to eliminate backlash. Although this is possible, there are problems in that it requires high-precision machining, is difficult to maintain, and is expensive to manufacture.

(Means for Solving the Problems) In order to solve the above problems, the present invention uses elastic belts in the meshing parts of the gears to eliminate backlash in the meshing of the gears and transmit power. I'm doing it like I'm doing it.

(Function) By interposing an elastic belt in the meshing part of the gears, the gap when the gears mesh can be filled, backlash can be eliminated, and a small and inexpensive speed reducer can be manufactured.

(Example) To carry out the present invention, a well-known timing belt is used as an elastic belt, and a pulley is used as a gear for the timing belt.

To explain in detail with reference to the drawings, Fig. 1 is a front sectional view, and Fig. 2 is a front sectional view.
The figure is a side sectional view. (1) is a drive toothed pulley, (
2) + (3) l (4) meshes with inner circumferential teeth fixed by a planetary toothed pulley with a timing belt (5) interposed therebetween. (7L (8) and (9) are tension toothed pulleys that apply tension to the timing belt (5). The timing belt (5) has both teeth, and the drive toothed boob IJ-(1) The drive toothed pulley (1) and the timing belt (5) always operate in both forward and reverse directions at the same time. 6), and the teeth on the front and back of the belt simultaneously mesh with the planet toothed boo! J-(2) and the inner circumferential tooth (6), respectively.The planet toothed boo IJ
- (3) and (4) similarly interpose a timing belt (5) between the inner circumferential teeth (6) and mesh with the front and back teeth of the timing belt (5), respectively, and Boo with planetary teeth! J-(2)+(3)+(4) are arranged at eight equal positions on the circumference. The timing belt (5) is endless and has planetary toothed pulleys (2), (3),
The engagement adjustment between (4) and the inner circumferential teeth is done using a pulley with tension teeth (
7), (8L (9)), and tension adjustment, rotational balance adjustment, etc. of the timing belt (5) are also carried out using the toothed boob +) - (7) + (3), (9). . Boo with driving teeth! J-(1) is equipped with a shaft, and the driving side shaft has a rolling bearing α1, and the rotating disk a shown in FIG.
A cylindrical coupling (6) is fitted onto the drive side shaft of the drive toothed boob IJ-(1) on the outside of the rolling bearing αQ, which has a bearing housing. Also, drive toothed boo IJ -
There is a rolling bearing (to) on the output side of (1), and the rotating disk 04 with a shaft is used as a bearing housing. The shaft portion of the shafted rotating disk q4 is the output shaft αG. The rotating disk Qη and the rotating disk α◆ with a shaft are connected and integrated by the respective fixed shafts Q of the tension toothed boob +J - (7L (8L) (9), and the tension toothed boob IJ - (7), (8L (9) is fitted with an oil-free bushing α, and is supposed to rotate freely around the fixed shaft qQ. The fixed shaft lJ is as shown in Fig. 8.
Adjustment and installation can be done with a fixed position. Boo with planetary teeth! J-(2), (3).

(4) has a built-in rolling bearing, and the shaft (to) is a fixed rotating shaft. As shown in Fig. 8, the axis (to) is connected to a rotating disk (6
), a rotary disk with a shaft (the square piece 0 that is slid into the notch of 14 is used as both support bearings, and the square piece
The planetary toothed pulleys (2L (3), (4)
5) is in pressure contact with the inner circumferential tooth (6). The inner circumferential teeth (6) are fixed between the drive side shell and the output side shell of the reducer. The rotating disk α◆ with a shaft and the rotating disk aη which are connected and fixed are rolling bearings 06. a
The cylindrical coupling (2) on the driving side is made so as to be able to freely rotate with each other through 3 and to be able to rotate together.
The rolling bearing (to) that fits into the output shaft 0! It is supported by a rolling bearing (c) fitted to lG, and the rolling bearings (to) and (to) use the drive side outer shell e2N) and the output side outer shell (support) as bearing whistles, respectively.

Since it is configured as above, now the cylindrical coupling @
When it is rotated, the drive toothed boob IJ-(1) rotates and operates the timing belt (5). At this time, the timing belt (5) wraps around the drive toothed pulley (1) sufficiently and has many biting teeth, so the drive toothed pulley (
The timing belt (5) operates simultaneously with the rotation of 1). The planetary toothed pulleys (2), (3), and (4) are pressed against the inner circumferential teeth (6) with the timing belt (5) in between. Therefore, the teeth on the front and back sides of the timing belt (5) have the tooth shape of the inner circumferential teeth (6) and the planetary teeth! J-(2),
(3).

Make sure that the timing belt (5) is fully engaged with the tooth pattern of (4).
Coupled with the difference in the meshing state between the surface tooth pattern and the tooth pattern of the inner circumferential tooth (6), the rotating disk rotating body rotates simultaneously with the operation of the timing belt (5), and the output shaft αυ rotates. The reduction ratio of this reduction gear is determined by the ratio of the number of teeth of the drive toothed pulley to the inner circumferential teeth, and it is also possible to manufacture a reduction gear with two or more stages. Further, in this embodiment, the planetary toothed pulley and the tension toothed pulley are rotated, but each toothed pulley may be fixed and the inner circumferential teeth rotated.

(Effects of the Invention) As described above, the present invention uses an elastic belt in the meshing part of the power transmission gear, and in the embodiment, by interposing a timing belt, the gap in the meshing part is eliminated and the By eliminating pack lashes during reverse conversion, it is possible to obtain an accurate rotational restoration position, and the drive input shaft center and output shaft center can be made coaxial in a straight line, making it possible to provide a compact and inexpensive reducer. and has a great effect on good rotational conduction.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of the present invention, FIG. 2 is a side sectional view, and FIG. 3 shows a rotating disk. (1) is a drive toothed pulley, (2L (3), (4) is a planetary toothed pulley, (5
) is the timing belt, (6) is the inner circumferential tooth, (7), (8), (9) is the tension toothed pulley, αp
is a rotating disk, (2) is a cylindrical coupling, (14
is a rotating disk with a shaft integrated with the output shaft 0!19, (1 is the shaft for the pulley with tension teeth, 2 is the shaft of the pulley with planetary teeth, α1 is the square piece, CB), @ is the outer shell. ......etc.

Claims (1)

[Claims] (1) A reduction gear that uses an elastic belt as a medium to transmit rotational power.