KR200409054Y1 - Epicyclic reduction gear - Google Patents

Abstract

The present invention is a planetary gear reducer for reducing the rotational speed of the power unit, so that the external gear and the internal gear that are eccentrically rotated are able to be combined to transfer a large torque, the reduction ratio is large, in particular, excellent durability and robustness and precision It is related to the planetary gear reducer to increase the.

The present invention is a case having an inner diameter having a predetermined diameter in the center; A flange coupled to one side of the case; An input shaft coupled to the inside of the case by passing through the flange by a ball bearing; An eccentric body coupled to the input shaft and eccentrically rotated; An external gear connected to the eccentric body by a roller and coupled to the crankshaft; An internal gear meshed with an external gear; In the planetary gear reducer consisting of an output shaft coupled to the crank shaft and interlocked rotation, a trapezoidal tooth is formed on the outer circumference of the outer gear and the inner circumference of the inner gear, and the outer gear and the inner gear are eccentrically rotated by engaging without play. Accordingly, it is possible to improve the firmness, bearing capacity and durability according to the engagement of the internal gear and the external gear, and to smoothly perform a deceleration function for large torque transmission.

Reducer, case, crankshaft, input shaft, external gear, internal gear

Description

Internal Planetary Gear Reducer {EPICYCLIC REDUCTION GEAR}

1 is a longitudinal sectional view showing a conventional planetary gear reducer;

Figure 2 is a side view showing a conventional planetary gear reducer,

3 is an enlarged sectional view showing main parts of a planetary gear reducer according to the present invention;

FIG. 4 is a cross-sectional view of part A of FIG. 3 and shows an embodiment to which an involute tooth is applied.

FIG. 5 is a cross-sectional view of part A of FIG. 3 and illustrates an embodiment to which a trapezoidal tooth is applied.

<Explanation of symbols for the main parts of the drawings>

1: Planetary Gear Reducer 10: Case

12: Input shaft 13: Eccentric body
15: Shout gear 16: crankshaft
17: Snatches

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The present invention relates to a planetary gear reducer, and more particularly, in the planetary gear reducer for reducing the rotational speed of the power unit, it is possible to transfer a large torque by engaging the eccentric rotation of the external gear and the internal gear to reduce the gear ratio. In particular, the present invention relates to a high precision internal planetary gear reducer employing an eccentric rotation type planetary gear differential gear which is excellent in durability, robustness, and accuracy.

In general, the reduction gear is a device for reducing the high speed rotational force input from the power unit at a predetermined rate and outputting the low speed rotational force. According to the intended use, it forms various forms, and is mainly a planetary gear. Reducers are widely known and used.

In particular, the planetary gear reducer is widely known as a cycloid reduction gear, and it is used as a reduction mechanism in all of you because it can transmit a large torque and have a large reduction ratio.

Such a conventional planetary gear reducer includes a case 101 having an inner diameter having a predetermined diameter at the center thereof, as shown in FIGS. 1 and 2; A flange 102 coupled to one side of the case 101; An input shaft 104 rotatably coupled to the inside of the case 101 through the flange 102 by the ball bearing 103; An eccentric body 105 coupled to the input shaft 104 and eccentrically rotated; An external gear 108 connected to the eccentric body 105 by a roller 106 and coupled to the crankshaft 107; It has a configuration consisting of an output shaft (not shown) which is coupled to the crank shaft 107 to rotate in conjunction with.

Therefore, when the rotational force is transmitted from the separate power unit to the input shaft 104, the input shaft 104 is rotated to rotate the eccentric body 105, connected to the eccentric body 105 and the roller 106, and the crank shaft ( As the external gear 108 coupled to 107 is rotated, the external gear 108 is engaged with the internal gear 109 and rotates. As the internal gear 109 is rotated, the output shaft coupled by the crank shaft 107 is decelerated at a predetermined ratio. Is rotated.

At this time, the external gear 108 coupled by the crank shaft 107 is rotated eccentrically by the eccentric body 105.

As shown in FIG. 2, the conventional cycloidal planetary gear reducer is eccentrically rotated as the outer gear 108 is engaged with the internal gear 109, and the teeth of the eccentrically rotated outer gear 108 are curved. It is made of a cycloid gear (cycloid gear) of the type, the inner gear 19 is a radially coupled inner tooth pin 109 ′ at equal intervals is to rotate while engaging the outer gear 108.

However, in the conventional planetary gear reducer as described above, the teeth of the external gear that are engaged and rotated for deceleration are formed in a curved shape, and the internal gears are configured to form teeth by external tooth pins instead of teeth. There is a problem that the bearing capacity for the engagement is weak and not robust, the durability and precision are inferior, and in particular, the transmission force for the large torque is weak.

The present invention is to solve the conventional problems as described above, the purpose is to reduce the rotational force of the power unit using the planetary gear reducer, the teeth of the internal gear and the external gear that is eccentrically rotated to be engaged in a stable and stable It is made of gear tooth shape, and it is a new type of eccentric rotation type planetary gear that can perform precise deceleration rotation as well as deceleration function for large torque transmission by increasing the rigidity, bearing capacity, durability and precision according to the engagement. It is to provide a high precision internal planetary gear reducer employing a differential gear.

In order to achieve the above object, the present invention is a case having an inner diameter having a predetermined diameter in the center; A flange coupled to one side of the case; An input shaft coupled to the inside of the case by passing through the flange by a ball bearing; An eccentric body coupled to the input shaft and eccentrically rotated; An external gear connected to the eccentric body by a roller and coupled to the crankshaft; An internal gear meshed with an external gear; In the high precision internal planetary gear reducer adopting an eccentric rotation planetary gear differential gear composed of an output shaft coupled to a crank shaft and interlocking rotation, the teeth of the external gear and the internal gear are composed of toothed gear teeth that mesh with each other. It is characterized by robustness.

The outer peripheral surface of the external gear and the inner peripheral surface of the internal gear has an involute tooth of module 1 or more, or a trapezoidal tooth is formed, and the external gear and the internal gear are eccentrically rotated to engage with each other without play.

Hereinafter, the present invention in more detail by the accompanying drawings as follows.

3 and 4, the planetary gear reducer 1 according to the present invention is coupled to the flange (not shown) on one side of the case 10, the input shaft 12 through the flange (not shown) Is coupled, the eccentric body 13 is coupled to the input shaft 12, the outer gear 15 is formed in the outer peripheral surface teeth 15 'by the roller (not shown) is connected to the eccentric body 13 is interlocked rotation It is done.

In addition, the external gear 15 is coupled to the crankshaft 16, the internal gear 17 is formed to be engaged with the teeth 17 'corresponding to the teeth 15' of the external gear 15, the crank shaft An output shaft (not shown) is coupled to rotate with 16.

In the present invention, the toothed portion 15 'of the external gear 15 and the toothed portion 17' of the internal gear 17 have good gear engagement with each other in the form of eccentric rotation type planetary gear differential, rather than a cycloid tooth. do.

The teeth 15 'and 17' used in the present invention are formed in an involute standard form, and the module is formed to be one or more. Therefore, the engagement of the external gear 15 and the internal gear 17 is improved, and the external gear 15 is eccentrically rotated by the eccentric body 13 from the input shaft 12 as a starting point.

In another embodiment, trapezoidal teeth 15 'and 17' are formed on the outer circumferential surface of the external gear 15 and the inner circumferential surface of the internal gear 17, and the teeth 15 'and 17' are freely engaged. The outer gear 15 is eccentrically rotated by the eccentric body 13 from the input shaft 12 as a starting point.

3 is an enlarged cross-sectional view showing a planetary gear reducer according to the present invention, in which an eccentric body 13 is eccentrically coupled to an input shaft 12 to which rotational force is transmitted from the outside, and an external gear 15 to an eccentric body 13. ) Is rotated to be eccentrically rotated, but engaged with the internal gear (17) is to be decelerated.

At this time, the teeth 15 'and 17' formed on the external gear 15 and the internal gear 17 are engaged without gaps in the process of being engaged with each other, and the external gear 15 is an eccentric rotation, that is, a cycloid form. Is rotated.

FIG. 4 is a cross-sectional view of part A of FIG. 3, wherein the external gear 15 and the teeth 15 ′ and 17 ′ of the internal gear 17 are involute teeth, and FIG. 5 shows the external gear (15) and teeth 15 'and 17' of internal gear 17 are shown in a trapezoidal shape, and are rotated in an eccentric rotation of planetary gears.

As such, the use state of the embodiment of the planetary gear reducer according to the present invention will be described.

As shown in Figures 3 to 5, in the process of using a power unit (not shown) using the planetary gear reducer 1 according to the present invention, the high-speed rotation is to be reduced to a low speed, the input shaft ( As the 12 is rotated, the eccentric body 13 coupled thereto is rotated, and the deceleration is made while the external gear 15 is engaged with the internal gear 17 by the eccentric body 13, and then the output shaft (not shown) The decelerated rotational force is transmitted through.

In this process, the external gear 15 and the internal gear 17 are rotated while the external gear 15 is eccentrically rotated by the eccentric shaft 13, and the teeth 15 'and 17' formed in each of the modules are rotated. It consists of one or more involute teeth, or an improved trapezoidal shape, so that they are stable and firmly interlocked with each other.

In addition, since the toothed gear reducer 1 of the present invention has involute teeth, the teeth 15 'and 17' formed on the external gear 15 and the internal gear 17 have a involute tooth shape, and thus the coupling between the gears is firm, and particularly, When the gear is formed in a trapezoidal shape, the gears are held in close contact with each other without unnecessary play during engagement, thereby maintaining strong strength and durability against large torque transmission, even when a load is applied to the input shaft 12 or the output shaft during eccentric rotation. Rotation deceleration by eccentric rotation is made smoothly without flowing or shaking.

As described above, according to the eccentric rotation planetary gear differential gear system according to the present invention, in reducing the rotational force by using the planetary gear reducer, the teeth of the eccentrically rotated internal gear and the external gear are involute standard or trapezoidal. As it is made of teeth, it is possible to improve the firmness, bearing capacity and durability according to the teeth, and to increase the precision to achieve precise deceleration rotation, and to smoothly perform the deceleration function for large torque transmission, Increasing efficiency will bring economic benefits.

Claims (3)

A case having an inner diameter having a predetermined diameter in the center thereof; A flange coupled to one side of the case; An input shaft coupled to the inside of the case by passing through the flange by a ball bearing; An eccentric body coupled to the input shaft and eccentrically rotated; An external gear connected to the eccentric body by a roller and coupled to the crankshaft; An internal gear meshed with an external gear; In the internal planetary gear reducer adopting an eccentric rotation type planetary gear differential differential gear consisting of an output shaft coupled to a crank shaft and interlocked and decelerated by the tooth ratio between the internal gear and the external gear, The teeth 15 'and 17' of the external gear 15 and the internal gear 17 are formed of toothed gear teeth that mesh with each other, and adopt an eccentric rotation planetary gear differential gear. Internal planetary gear reducer. The eccentric rotation type planetary gear differential gear according to claim 1, wherein the teeth 15 'and 17' of the external gear 15 and the internal gear 17 are involute standard teeth having one or more modules. One internal planetary gear reducer. The internal gear adopting the eccentric rotation planetary gear differential gear according to claim 1, wherein the teeth 15 'and 17' of the external gear 15 and the internal gear 17 have a trapezoidal improved tooth shape. Planetary gear reducer.

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