JPS6242199Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used as a transmission, for example, and includes a sun gear at the center, a plurality of planetary gears surrounding it,
Furthermore, an output board in which outer shell internal gears are provided so as to mesh with each other and pivotally supports the planetary gears;
Regarding the improvement of a planetary gear system in which a speed change action is performed between the sun gear and the sun gear, a shortless internal gear of the planetary gear system is designed so that various vibrations exerted on the outer shell internal gear are not transmitted to the casing. Regarding the mechanism.

Due to its high symmetry, the planetary gear system used as a transmission device causes less energy loss during gear shifting, generates little noise and vibration, and is easy to install because the input and output shafts are aligned on the same straight line. It has excellent features such as convenience. However, because of the high symmetry of the planetary gear transmission mechanism, a truly high level of precision in dividing the planetary gears is required. If the accuracy is poor and there is a slight misalignment, irregular pulsations will occur in the meshing state of the planetary gear, sun gear, and outer shell internal gear, and the gears will locally mesh deeply with each other, increasing frictional force. On the contrary, energy loss is large, noise is high, and tooth surface wear becomes significant.

In other words, the output plate that supports the planetary gears is not supported by bearings, etc., but is meshed with and supported by the outer shell internal gear, so even a slight eccentric rotation of the output plate is prevented, especially during high speed rotation. The tips of the planetary gear teeth will then bite deeply into the external internal gear in that direction.

In order to solve this problem, we created a structure in which disks with the same pitch circle as the planetary gear are attached to both sides of the planetary gear, and outer shell rings with an inner diameter equal to the pitch circle of the outer shell gear are attached to both sides of the internal gear. Planetary gearing has already been devised. This system correctly regulates the center-to-center distance between the planetary gear and the outer shell gear by bringing a disk and ring that are equal to the pitch circle into rolling contact with each other, making it possible to avoid strong meshing between the two gears and create a smooth Since the rotation is always maintained, the transmission efficiency is excellent, and it has the remarkable feature of generating less noise and vibration.

However, even with a planetary gear system that combines gears, discs, and rings, if the input shaft or output shaft is eccentric, or if the planetary gear splits with poor precision and rotates eccentrically during high-speed rotation, this may cause problems. The resulting radial vibrations are transmitted to the outer internal gear, and from the outer internal gear directly to the casing, so it is not possible to reduce noise and vibration below a certain level.

The present invention was created to solve the above problems, and its purpose is to provide a shockless internal gear mechanism for a planetary gear system that can easily absorb and alleviate vibrations, shocks, and noise. It is something to do.

The shortless internal gear mechanism of the planetary gear device of the present invention includes a sun gear, a plurality of planetary gears surrounding and meshing with the sun gear and having disk portions equal to pitch circles attached on both sides; an output plate that pivotally supports the planetary gear; an external internal gear that surrounds and meshes with the planetary gear; an internal diameter that is equal to the pitch circle of the internal internal gear; In a planetary gear device consisting of an outer shell ring which is larger than the outer diameter of the outer shell internal gear and supports the outer shell internal gear from both sides, a plurality of arbitrarily shaped notches are carved on the outer periphery of the outer shell internal gear. A plurality of protrusions are provided on both sides of the ring, and a plurality of oval loose fitting holes are bored in the side surface of the outer shell ring in the radial direction to allow the protrusions to fit loosely therein. The feature is that the outer shell internal gear is slidably held by the outer shell ring, and the outer shell internal gear can be slightly displaced only partially in the radial direction.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a front view of a planetary gear device according to an embodiment of the present invention, with a portion cut away appropriately, and FIG. 2 is a longitudinal sectional view thereof.

Reference numeral 1 denotes a circular output plate, on which three planetary gears 2 are rotatably supported at rotationally symmetrical positions. That is, a ring-shaped output sub-board 6 is attached to the front surface of the output board 1 and is parallel to the output board 1.
A planetary shaft 9 that penetrates and supports the planetary gear 2 is bridged at three corresponding locations on the output board 1 and the sub-board 6.
In this example, the output board 1 and the sub-output board 6 are made of plastic, and the sub-board 6 is provided with fitting holes 17 at three appropriate locations, and the corresponding locations on the output board 1 are provided with fitting protrusions 16. is provided protrudingly. Then, by simply pushing the fitting protrusion 16 into the fitting hole 17, the output sub-board 6 is combined with the output board 1. For this reason, an air vent hole is bored in the sub-panel 6 following the fitting hole 17. In addition, 14
is an output shaft hole formed in the output board 1, into which an output shaft (not shown) is attached.

A sun gear 3 is provided at the center surrounded by three planetary gears 2 so as to mesh with them. This sun gear 3 has a D-shaped input shaft hole 13, into which an input shaft (not shown) is attached. The input shaft hole may also be engraved with a key, spline, etc.

On the other hand, an outer shell internal gear 4 that meshes with the planetary gears 2 is provided on the outside of the planetary gears 2 . On both sides of the outer shell internal gear 4, there are outer shell rings 5 that support the outer shell internal gear 4.
is installed. The inner diameter of the outer shell ring 5 is equal to the pitch circle of the outer shell internal gear 4, and its outer diameter is larger than the outer diameter of the outer shell internal gear 4. That is, a gap G is formed on the back surface of the outer shell internal gear 4.

On the other hand, the planetary gear 2 is made up of a gear ring 7 made to be easily flexible, and a planetary gear inner ring 8 made of a pair of pieces that are fitted into each other from both sides and integrated to hold the gear ring 7 firmly. There is. Planetary gear inner ring 8
is pivotally supported by the planetary shaft 9, and the outer diameter of both side disk portions is formed to be equal to the pitch circle of the gear ring 7. As is clear from Fig. 1, the planetary gear inner ring 8
Since the outer shell ring 5 and the outer shell ring 5 roll in contact with each other while exerting radial force on each other, a constant distance is always maintained between the gears, and the teeth do not mesh with each other abnormally, reducing friction loss.

As shown in FIG. 5, a plurality of arbitrarily shaped notches 23 are cut on the outer peripheral portion of the outer shell internal gear 4, making the outer shell internal gear 4 easy to bend. Further, a plurality of protrusions 22 are provided on both sides of the outer shell internal gear 4.

A plurality of slightly elongated elliptical loose fitting holes 20 in the radial direction are bored in the side surface of the outer shell ring 5, into which the projections 22 can be loosely fitted.

The protrusion 22 of the outer shell internal gear 4 is loosely fitted into the loose fitting hole 20 of the outer shell ring 5, and the outer shell ring 5 slidably holds the outer shell internal gear 4. Note that FIG. 3 is an enlarged radial cross-sectional view showing the fitting portion of the protrusion 22 and the loose fitting hole 20, and FIG. 4 is an enlarged partial front view showing one outer shell ring removed.

The outer shell ring 5 is fixed to the inner surface of a casing (not shown) that covers it, but the outer shell internal gear 4 can partially be slightly displaced in the radial direction.
This is because the outer shell internal gear 4 is slidably held by the outer shell ring 5, has a gap G on its outer periphery, and has a notch 23 on the outer periphery. This is because a plurality of protrusions are carved, and there is a constant gap in the radial direction between the protrusion 22 of the outer shell internal gear 4 and the loose fitting hole 20 of the outer shell ring 5. Therefore, when the outer shell internal gear 4 receives a force from the planetary gear 2, it partially undergoes elastic deformation of a curved beam in response to the radial force, and partially undergoes a slight displacement in the radial direction. Become.

In the above embodiment, in order to make the outer shell internal gear 4 more flexible, a notch 23 as shown in FIG. 5 was provided on the outer circumference, but in other embodiments, this A spline 25 may be carved in place of the notch 23 (see FIG. 6).

Further, in the above embodiment, the outer shell internal gear 4 has a cavity G on the outside, but it is also possible to fill this cavity G with a highly elastic material such as rubber. Good too. FIG. 7 is an enlarged radial cross-sectional view of the fitting portion between the outer shell ring 5 and the outer shell internal gear 4, showing this situation. Since the elastic material 24 is filled in the gap G, a restoring force can be applied to the displacement of the outer shell gear.

As mentioned above, according to the present invention, external vibrations and shocks transmitted from the output shaft, output plate vibrations caused by deviation of the center of gravity of the output plate due to poor division accuracy, etc. are transmitted from the planetary gear to the outer shell internal gear. However, the outer shell internal gear is partially elastically deformed and can be slightly displaced only partially in the radial direction, so these vibrations of the output board are absorbed by the outer shell internal gear and transmitted to the casing. It disappears without a trace. Therefore, in this device, generation of vibration and noise is suppressed, and power balance can be suitably maintained.

Furthermore, when the gear is made of plastic, the adverse effects of thermal expansion are very large, but in the configuration of this device, the outer shell internal gear 4 can freely expand outward, so the planetary gear Even if the tooth surfaces of the teeth are displaced in the radial direction, the teeth do not mesh strongly, and the effects of thermal expansion can be absorbed.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the entire planetary gear device having a shotless internal gear mechanism according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view thereof, and Fig. 3 shows the outer shell ring and the inside of the outer shell. Fig. 4 is a partially enlarged front view of the fitting part with one outer shell ring removed; Fig. 5 is a partially enlarged front view of the fitting part with one outer shell ring removed. FIG. 6 is a partially enlarged front view of the outer shell internal gear and the other outer shell ring, FIG. 6 is a partially enlarged front view similar to FIG. 5 showing another embodiment, and FIG. 7 is a partially enlarged front view showing another embodiment. FIG. 3 is an enlarged sectional view similar to FIG. 3; 1 is the output board, 2 is the planetary gear, 3 is the sun gear, 4
5 is an outer shell internal gear, 5 is an outer shell ring, 20 is an oblong loose fitting hole, 22 is a protrusion, 23 is a notch, and 25 is a spline.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A sun gear 3, and a plurality of planetary gears 2, 2, 2, 2, 2, 2, 2, 2, 3, which surround and mesh with the sun gear 3, and have disk portions equal to pitch circles attached on both sides. , an output plate 1 that pivotally supports the planetary gears 2, 2, . . . , an outer shell internal gear 4 that surrounds and meshes with the planetary gears 2, 2, . gear gear 4
The outer diameter is equal to the pitch circle of the outer shell internal gear 4.
In a planetary gear device consisting of an outer shell ring 5 which is larger than the outer diameter of the outer shell internal gear 4 and supports the outer shell internal gear 4 from both sides, a notch 23 of an arbitrary shape is provided on the outer periphery of the outer shell internal gear 4. A plurality of protrusions 22 are formed on both sides of the shell ring 5 to make it partially flexible, and a plurality of oval loose fitting holes 20 are bored in the radial direction on the side surface of the outer shell ring 5. The protrusion 2
2 is fitted loosely, and the outer shell internal gear 4 is slidably held by the outer shell ring 5, so that the outer shell internal gear 4 can be slightly displaced only partially in the radial direction. Shockless internal gear mechanism of planetary gear system. 2. A shotless internal gear mechanism for a planetary gear device according to claim 1, in which the notch 23 is a spline 25.