JPS5912896B2 - Decelerator - Google Patents

Description

[Detailed description of the invention] The present invention relates to a speed reducer.

Conventionally, the speed reducer used to rotate the drum of a mixer truck around its front wall axis has a ratio of (100:1) to (
It had a large reduction ratio of 150:1).

Reduction gears with large reduction ratios for such uses include (a) a combination of two spur gears and a planetary gear, (b) a two-stage internal meshing gear mechanism, and a) multiple oscillating gears. A combination of an internal meshing gear mechanism balanced by external gears and a planetary gear.

etc. have been used.

However, the method described in item (a) above has the disadvantage that the number of parts increases, the volume increases, and the weight becomes large, and the item described in item (b) has the disadvantage that the structure is complex, making manufacturing troublesome and expensive. can be,(
In the case of item (), extra weight must be added to balance the oscillating external gear, which is not related to the deceleration effect, resulting in an increase in the number of parts, an increase in volume and weight, and an increase in cost.

The present invention eliminates all of these conventional drawbacks and achieves (10
The purpose of the present invention is to enable a large reduction ratio of 0:1) or more to be manufactured compactly and lightweight with a minimum number of parts, and to operate smoothly and quietly with little noise and vibration.

Therefore, a feature of the present invention is that a single-stage spur gear reduction mechanism or a planetary gear reduction mechanism and an internal meshing gear mechanism are integrally interlocked and housed in a common casing, and the internal meshing gear mechanism is integrated into a common casing. The oscillating external gear is made into a single piece, and the large spur gear of the single-stage spur gear reducer or the planetary gear of the planetary gear reduction mechanism fixed to the eccentric shaft on the input side of the internal meshing gear mechanism is provided with a balance section. is provided, and the unbalance of the oscillating external gear due to eccentric rotation is removed by the balance portion of the taper gear and the planetary gear to maintain balance.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In FIGS. 1 to 3, reference numeral 1 denotes a front head plate of a mixer drum, and a bearing female member 3 having a spherical bearing recess 2 is fixed at the center of the front head plate 1, and a low-speed drive shaft 4 is fixed to this. The spherical head-shaped tip 5 of the mixer drum is fitted in such a way that it can swing freely, and the center of the front head plate 1 of the mixer drum is pivotally supported by the drive shaft 4.

Furthermore, the female bearing member 3 is provided with internal teeth 6, and the spherical tip 5 is provided with external teeth 7 at the equator position, and both teeth 6 , 7 mesh with each other to transmit the rotation of the drive shaft 4.

Reference numeral 8 denotes a speed reducer mounted on the stand 9 of the mixer truck with bolts 10, etc., and the output shaft of the speed reducer 8 corresponds to the drive shaft 4.

Reference numeral 11 denotes a casing of the reduced continuous shooting 8, which is formed by connecting a front part 11a and a rear part 11b with bolts 12, etc., and the drive shaft 4 is inserted into a hole 13 of this front part 11a, and a bearing 14.14 It is pivoted at.

Thus, the casing 11 includes a single-stage spur gear reduction mechanism E and an internal meshing gear mechanism S that are interlocked and connected.

That is, the cylindrical mechanisms E and S are integrally contained within the common casing 11.

Reference numeral 15 denotes a drive device such as a hydraulic motor fixed to the rear part 11b of the casing. A stepped spur gear reduction mechanism E is configured.

On the other hand, as is clear from FIG. 1 and FIG.・・・・・・
The hole portions 22 into which the force is inserted are distributed at equal center angles, and the outer periphery has cycloidal curved uneven portions 23. A rocking external gear 25 having a bearing hole 24 meshes with the concave and convex portions 23 of the rocking external gear 25, and the concave and convex portions 23
The outer pin 26 has only one more tooth than the number of teeth.
and an eccentric shaft 2 inserted into the hole 24 of the external oscillating gear 25.
It consists of 7th grade.

The outer pins 26 are arranged in parallel on the inner peripheral surface of the casing 11.

Further, the axis of both ends of the eccentric shaft 27 coincides with the axis of the first drive shaft 4, but the central eccentric portion 28 corresponding to the hole 24 of the oscillating external gear 25 is eccentric by an eccentric amount e.

The dimensional difference between the outer diameter of the roller 20 and the inner diameter of the hole 22 is set to twice the amount of eccentricity, that is, 2e.

Then, the oscillating external gear 25 of the internal meshing gear mechanism S is made into a single piece, and the eccentric shaft 27 on the input side of the internal meshing gear mechanism S
The large spur gear 18 of the single-stage spur gear reduction mechanism E is fixed to the rear end of the gear by spline connection or the like.

FIG. 3 shows this spline coupling hole 29 as an example, but as is clear from the same figure, three balance holes 30, 30, 30 are provided through the large spur gear 18, and the above-mentioned swing This is a balance portion M for eliminating unbalance due to eccentric rotation of the external moving gear 25.

2 and 3 correspond, and the centers of gravity of the balance holes 30 may be made to correspond to the eccentric direction of the oscillating external gear 25.

In addition, as the balance part M, a balance weight 31 may be attached in a direction opposite to the eccentric direction by 180 degrees as shown by the imaginary line in FIG. 3.

Next, in FIGS. 4 to 6, the planetary gear reduction mechanism P and the internal meshing gear mechanism S are integrally connected and housed in the common casing 11, and the internal meshing gear mechanism S is rotated. The movable external gear 25 is made into a single piece, and the planetary gears 33, 33, 33 of the planetary gear reduction mechanism P are fixed to the three eccentric shafts 32, 32, 32 on the input side of the internal meshing gear mechanism S. , a balance hole 30 is provided through it to form a balance part M, and the balance part M of the planetary gear 33 removes the unbalance of the oscillating external gear 25 due to eccentric rotation to achieve balance.

In the illustrated example, a drive device 15 such as an axial hydraulic pump is also housed in the same casing 11, and a gear is provided on the output shaft 16 of the drive device 15 to form a sun gear 34. Three planetary gears 3 that mesh with this
3... constitutes the planetary gear reduction mechanism P.

The twisted internal meshing gear mechanism S includes three output shafts 35, 35, 35 protruding from the inner end dog disk 19 of the output side drive shaft 4, and the output shafts 35... It has a hole 36 into which the central eccentric part 28 of the eccentric shaft 32 is inserted, and a hole 37 into which the central eccentric part 28 of the eccentric shaft 32 is inserted via a bearing, and the outer periphery has a cycloidal curved unevenness. Part 23...
The oscillating external gear 25 has a oscillating external gear 25, and the uneven portion 23...
・Outer pin 26 that meshes with... and the eccentric shaft 3
Consists of 2nd prize.

Therefore, due to the presence of the eccentricity e of the eccentric shaft 32, the oscillating external gear 25 oscillates as shown in FIG. The center of gravity G of the gear 25 is eccentric in the vertical and horizontal directions with respect to the shaft stopping point O of the drive shaft 4 and the output shaft 16.

In each of FIG. 5 II+-n-H, FIG. 6 1. ll-
H correspond to each other, and the center of gravity g of each planetary gear 33 is eccentric with respect to the axes a, b, and c in a direction completely opposite to the eccentric direction of the center of gravity G with respect to the axis O, and is balanced. I know that there is.

The present invention effectively achieves the intended purpose with the above-mentioned configuration, and includes a single-stage spur gear reduction mechanism E or a planetary gear reduction mechanism P.
It is necessary to rotate the drum of the mixer truck etc. by coupling with the internal meshing gear mechanism S (100:
1) At the same time as obtaining the above large reduction ratio, the spur gear reduction mechanism E
By using a single stage, we achieved a reduction in the number of parts and a lighter and more compact design.

Alternatively, by providing the balance portion M on the planetary gear 33, only a single oscillating external gear 25 is required, thereby achieving a reduction in the number of parts and a reduction in weight and size.

In particular, the balance portion M such as a balance hole or balance weight can be easily and inexpensively formed into the large spur gear 18 and the planetary gear 3.
3 can be provided.

In addition, this balance portion M has the remarkable effect of eliminating unbalance caused by eccentric rotation of the oscillating external gear 25, maintaining balance skillfully, and achieving smooth and quiet operation with less vibration and noise. .

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing one embodiment of the present invention, and FIG.
Figures 3 and 3 are sectional views taken along lines A-A and BB in Figure 1, respectively, Figure 4 is a partially sectional side view showing another embodiment, and Figures 5 and
FIG. 6 is shown to explain the balance, and is a sectional view taken along line C-C and line D-D in FIG. 4, respectively. E... Spur gear reduction mechanism, P... Planetary gear reduction mechanism,
S... Internal meshing gear mechanism, M... Balance part, 11.
... Casing, 18... Tai spur gear, 25... Oscillating external gear, 27.32... Eccentric shaft, 33... Planetary gear.

Claims (1)

[Claims] 1. A single-stage spur gear reduction mechanism E or a planetary gear reduction mechanism P and an internal meshing gear mechanism S are integrally connected and housed in a common casing 11, and the oscillating external gear of the internal meshing gear mechanism S is 25 is a single piece, and the internal meshing gear mechanism S
A balance portion M is provided on the large spur gear 18 of the single-stage spur gear reduction mechanism E or the planetary gear 33 of the planetary gear reduction mechanism P, which is fixed to the eccentric shaft 27° 32 on the input side of the A speed reducer characterized in that the unbalance of the external gear 25 is removed by the balance portion M of the thick spur gear 18 and the planetary gear 33 to maintain balance.