TW201833454A - Self-locking type decelerating mechanism capable of eliminating the insufficient positioning precision problem for the apparatus axially connected to a power-output end without using an additional braking device - Google Patents

Abstract

The invention provides a self-locking type decelerating mechanism, in which a power-input sun gear is utilized to drive a plurality of first-stage planetary gears and second-stage planetary gears coaxially arranged on a plurality of planetary gear series for rotation and revolution. The first-stage planetary gears are held and guided by a fixed first-stage ring gear. The second-stage planetary gears are capable of generating a first-stage deceleration power to drive a moveable power-output second-stage ring gear to generate a second-stage deceleration power for driving an apparatus axially connected to a power-output end. With the first-stage ring gear being fixedly arranged, and the first planetary gears and the second planetary gears being provided with different restraining modulus, a self-locking status can be instantly generated when the power of a power-input end stops, thereby eliminating the problem of insufficient positioning precision of the apparatus axially connected to the power-output end.

Description

 Self-locking speed reduction mechanism  

The present invention relates to a gear type speed reducer, and more particularly to a self-locking speed reduction mechanism.

A speed reduction mechanism constructed of gears generally uses a planetary gear set as an intermediate transmission component in order to obtain an ideal reduction ratio output. It is also known that, in the conventional technology, a planetary gear set having a multi-step reduction ratio transmission output is used to construct the gear type speed reducer, and an ideal low-speed, high-torque reduction ratio output can be obtained.

For example, U.S. Patent No. 6,296,072, 6, 257, 957 discloses a speed reduction mechanism having a two-stage planetary gear set and capable of generating a two-stage reduction ratio as a transmission output. However, these conventional speed reduction mechanisms generally lack the self-locking function except that the overall volume is relatively large.

More precisely, the planetary gear set generally includes a sun gear, a planetary gear, a planetary gear disk, and a ring gear, and a conventionally configured speed reduction mechanism with a two-step planetary gear set is added to the gear assembly. The reduced configuration combination results in a two-stage reduction ratio drive output.

It is known that the gear type speed reduction mechanism has an input end and an output end. For the entire speed reduction mechanism, the input end and the output end can be respectively selected from the sun gear, the planetary gear disc and the ring gear to achieve an ideal deceleration. The input end; the input end usually connects to a driver such as a motor to provide a rotary power input, and the output end usually connects the device with high torque and deceleration driving requirements; and it is known that the output of the deceleration mechanism as a whole is The device itself has a drag factor such as gravity, which will become the load of the speed reduction mechanism; when the input motor stops running (including forward rotation and reverse rotation), the device at the output end will generate the moment of inertia generated by the load ( Revolving inertia) maintains the end-speed operation in the same direction, so that it is impossible to accurately grasp the transmission position where the force device stops moving, or cause the output device to stop moving and cause damage or danger. In addition, when the output end device stops at the moment, it is also common to apply a momentary rotational momentum to the speed reduction mechanism due to the load, which is also a problem that affects the positioning accuracy of the output end device. The reason for this is that the conventional gear type speed reduction mechanism lacks the self-locking function.

In order to overcome the problem that the gear type speed reduction mechanism cannot be self-locking, the known technique is to arrange a brake device on the output end of the speed reduction mechanism or the device thereof, but the brake device is not a machine belonging to the gear type speed reduction mechanism itself. Pieces (that is, not sun gears, planetary gears, planetary gear discs, ring gears), there is a problem that it is difficult to reduce components, reduce configuration space, and reduce manufacturing costs.

The object of the present invention is to improve the conventional gear type speed reduction mechanism, particularly for a speed reduction mechanism configured with a multi-step planetary gear set capable of outputting a multi-step reduction ratio, and improving the sun gear, the planetary gear, and the planetary gear plate of the mechanism itself. Between the ring gears, the power that cannot enter the force end stops immediately and spontaneously generates self-locking, and even affects the positioning accuracy of the output end device.

In order to overcome the above problems, a preferred embodiment of the present invention provides a self-locking speed reduction mechanism, which is disposed in a casing used as a fixed end, including: a first-order planetary gear set and a second-order planetary gear set. The first-order planetary gear set includes a plurality of first-order planetary gears, the second-order planetary gear set includes a second-order planetary gear equal to the first-order planetary gears, and the plurality of equal-numbered first gears The second-order planetary gears are coaxially arranged in a planetary gear train, and the plurality of planetary gear trains are respectively pivotally disposed on a planetary gear disc. The first and second-order planetary gears of the coaxial train have the same number of teeth and different modulus. a sun gear disposed between the plurality of first-order planetary gears for use as an input end; a first-stage ring gear fixed in the casing and configured to be engaged in the plurality of first stages a periphery of the planetary gear; a second-order ring gear, the movable engagement is disposed at a periphery of the plurality of second-order planetary gears, and is used as an output end; wherein the sun gear is engaged with the plurality of The first-order planetary gear rotates and revolves on the planetary gear disc, and then transmits a first-order deceleration power to the plurality of second-order planetary gears via the planetary gear disc, so that the plurality of second-order planetary gears follow The first-stage deceleration power synchronously rotates and revolves; wherein the fixed first-order ring gear guides the plurality of first-order planetary gears to rotate and revolve, and the movable second-order ring gear receives the A plurality of second-order planetary gears are coupled to each other to output a second-order deceleration power.

In a further implementation, the sun gear is coaxially coupled to an input shaft. The second step ring gear is integrally formed at an end of a power output shaft.

In a further implementation, the casing is formed by an upper casing and a lower casing relatively locked, and the first-order ring gear can be separately fixed between the upper casing and the lower casing by a lock group; or The first step ring gear is integrally formed on the upper casing or the lower casing, and is further fixed between the upper casing and the lower casing.

According to the above configuration, the self-locking speed reduction mechanism of the present invention can be provided on the input sun gear shaft to be connected to a driver such as a motor (ie, an input driver), and the second-stage ring gear shaft of the output is connected with high torque and deceleration. The device that drives the demand (ie, the device at the output end) is used to drive the components described in the speed reduction mechanism with the input drive to provide a two-stage reduction ratio transmission output to the output device. In addition to this basic function, the components in the speed reduction mechanism can also have a self-locking function by virtue of the above-mentioned configuration features, especially when the input drive (for example, a motor) stops operating, the speed reduction mechanism The components can be immediately braked each other, so that the output device can be stopped immediately when it is operated to the desired position. Therefore, the present invention does not need to additionally increase the braking device, thereby reducing the manufacturing cost and facilitating the reduction of the configuration of the structure. space.

Further, details of the related art to which the present invention may be implemented will be explained in the following embodiments and drawings.

10‧‧‧Chassis

11‧‧‧Upper casing

12‧‧‧ Lower case

20‧‧‧First-order planetary gear set

21‧‧‧First-order planetary gears

30‧‧‧Second-order planetary gear set

31‧‧‧Second-order planetary gears

40‧‧‧ planetary gear plate

41‧‧‧ planetary gear train

50‧‧‧Sun Gear

51‧‧‧Inlet shaft

60‧‧‧First-order ring gear

70‧‧‧Second-order ring gear

71‧‧‧Output shaft

42, 52, 72‧ ‧ bearings

Figure 1 is an exploded perspective view of the present invention.

Figure 2 is an assembled cross-sectional view of Figure 1.

Figure 3 is a cross-sectional view taken along line A-A of Figure 2;

Figure 4 is a cross-sectional view taken along line B-B of Figure 2;

First, please refer to FIG. 1 to FIG. 4 together to disclose the configuration details of a preferred embodiment of a self-locking speed reduction mechanism provided by the present invention.

It can be seen from FIG. 1 and FIG. 2 that the speed reduction mechanism comprises a casing 10 and is disposed in the casing 10, including a first-order planetary gear set 20, a second-order planetary gear set 30, and a sun gear 50. A first step ring gear 60 and a second step ring gear 70. among them:

The casing 10 is used as a fixed end of the speed reduction mechanism, and the casing 10 can be locked by an upper casing 11 and a lower casing 12; the first step ring gear 60 can be locked to the upper casing. 11 and the combined end face of the lower casing 12 are in a fixed form that does not rotate; in addition, the first stepped ring gear 60 can be disposed in the casing 10 in other fixed manners.

The first-order planetary gear set 20 includes a plurality of first-order planetary gears 21, and the second-order planetary gear set 30 also includes second-order planetary gears 31 of the same number as the first-order planetary gears 21, and the plurality of The first and second-order planetary gears 21 and 31 are coaxially arranged in series to form a planetary gear train 41, and the plurality of planetary gear trains 41 are respectively pivotally disposed on a planetary gear disc 40. The first and second-order planetary gears 21, 31 may also be integrally formed by coaxial machining or integrally fixed by the axle, so that the first and second-order planetary gears 21, 31 can be coaxially and synchronously rotated on the planetary gear plate 40, and The planetary gear plate 40 is driven to revolve around the sun gear 50 (as shown in Figure 3).

FIG. 3 discloses that the fixed first-order ring gear 60 is disposed on the periphery of the plurality of first-order planetary gears 21 such that the plurality of first-order planetary gears 21 can engage the fixed first-order The ring gear 60, in turn, receives the guidance of the first stage ring gear 60 and revolves around the sun gear 50.

It is also disclosed in FIGS. 2 and 3 that the sun gear 50 described above is interposed between the plurality of first-order planetary gears 21 and is used as a force input end of the speed reduction mechanism. Therefore, the sun gear 50 can also be referred to as a first-order sun gear, but it must be noted that the sun gear is not disposed in the second-stage speed reduction mechanism. On the other hand, it can be seen from FIG. 2 that the center of the sun gear 50 can be coaxially fixed to the input force shaft 51, or the sun gear 50 can be integrally formed coaxially with the input shaft 51, and then the motor shaft 51 can be used to pivot, for example, a motor. Power source. Further, in FIG. 2, the detachable bearing 52 between the input shaft 51 and the lower casing 12 is further disclosed, so that the input shaft 51 can freely drive the sun gear 50 to rotate. In addition, the planetary gear plate 40 is pivotally connected to the input shaft 51 via a bearing 42. Thus, the planetary gear plate 40 and the input shaft 51 (including the sun gear 50) can generate coaxial rotation at different rotational speeds. It does not interfere with each other and helps to reduce the structural space.

2 and 4, the second stepped gear 70 is movably disposed on the periphery of the plurality of second-order planetary gears 31, and the second-stage ring gear 70 is used as the output end. It can be seen from FIG. 2 that the second-order ring gear 70 can be integrally formed at the end of a power output shaft 71; or the second-stage ring gear 70 can be fixed in the manner of locking, bolting or tight fitting. The end of the output shaft 71 is integrated; further, a bearing 72 can be disposed between the output shaft 71 and the upper casing 11 so that the second-stage ring gear 70 can freely receive the plurality of second-order planetary gears 31. The power transmission shaft 71 can be connected to a device having a high torque and low speed requirement (ie, a device at the output end) to output a deceleration power.

In the above embodiment, it is further explained that the number of teeth of the first and second-order planetary gears 21, 31 of the coaxial train is the same, but the modulus is different. Wherein, the modulus of each of the first-order planetary gears 21 must match the first-order ring gear 60 that is engaged therewith in order to receive the guidance of the first-order ring gear 60 and revolve around the sun gear 50; each of the second steps The modulus of the planetary gear 31 must match the second-order ring gear 70 that is engaged therewith to drive the second-stage ring gear 70 to rotate.

Further, when the input sun gear 50 is rotated by a driver such as a motor, the plurality of first-order planetary gears 21 can be driven to rotate, and the plurality of first-order planetary gears 21 can The planetary gear plate 40 is driven to rotate, so that the plurality of first-order planetary gears 21 revolve around the sun gear 50 to generate a first-order deceleration power.

Since the plurality of first and second-order planetary gears 21, 31 are coaxially arranged in series on the planetary gear plate 40, the first-order deceleration power can be synchronously transmitted to the plurality of second-order planetary gears 31, so that The plurality of second-order planetary gears 31 rotate and revolve in synchronization with the plurality of first-order planetary gears 21 in accordance with the first-order deceleration power; subsequently, the transmission is matched via the plurality of second-order planetary gears 31 The movable second-stage ring gear 70 converts the first-order deceleration power into a second-order deceleration power, and outputs the second-order deceleration power to the second-stage ring gear 70 and the integrally formed output shaft 71 thereof. The device at the output end, as implemented, can generate a power conversion of the two-stage reduction ratio.

Based on the arrangement relationship of the gear members in the above-described speed reduction mechanism of the present invention, it can be further understood from FIG. 3 that the driver of the input force drives the sun gear 50 to rotate forward (clockwise) or reverse (counterclockwise). The direction of rotation of the sun gear 50 and the planet gear plate 40 is the same and is also known from FIG.

According to the above implementation, the present invention focuses on the first-order ring gear 60 being fixedly arranged, and the first and second-order planetary gears 21, 31 of equal number and different modulus are coaxially arranged in a plurality of planetary gears. The condition of the string 41 is restrained so that when the power input from the sun gear 50 as the input end stops, the second-stage ring gear 70, which is the output end and is movable, is reversely received by the first and second-order planetary gears 21, 31. The different modulus constraints and the mutual braking action of the fixed first-order ring gear 60 create a self-locking. Therefore, even if the device axially connected to the output end has a load such as gravity, the load generates a moment of inertia at the moment when the power input to the input end stops, and drives the output shaft (in the present invention, the second-order ring gear 70). The reverse rotation; however, the moment of inertia is subject to the above-described self-locking condition of the present invention (constrained) without causing reverse operation. Accordingly, the present invention can accurately grasp the transmission position of the output end when the device is stopped, and can also eliminate the problem that the power output device does not be damaged or dangerous when the power end is stopped at the input end. In addition, the present invention can also omit the configuration cost of the brake device and contribute to reducing the configuration space of the structure.

However, the above embodiments are merely illustrative of preferred embodiments of the invention, but are not to be construed as limiting the scope of the invention. Therefore, the present invention should be based on the content of the claims defined in the scope of the patent application.

Claims (6)

 A self-locking speed reduction mechanism is disposed in a casing used as a fixed end, and includes: a plurality of planetary gear strings respectively spaced apart from each other on a planetary gear plate, and the plurality of planetary gear strings respectively have a coaxial shape a first-order planetary gear and a second-order planetary gear capable of coaxially rotating, each of the first-order planetary gear and the second-order planetary gear having the same number of teeth and different modulus; a sun gear disposed on the plurality of Between the first-stage planetary gears, used as the input end; a first-stage ring gear fixed in the casing and disposed on the periphery of the plurality of first-order planetary gears; a second-order ring gear a movable engagement is disposed at a periphery of the plurality of second-order planetary gears, and is used as an output end; wherein the sun gear is engaged to drive the plurality of first-order planetary gears to rotate and is attached to the planetary gear plate Revolving, and transmitting a first-order deceleration power to the plurality of second-order planetary gears via the planetary gear disc, causing the plurality of second-order planetary gears to rotate synchronously according to the first-order deceleration power Revolving; wherein the fixed first-order ring gear guides the plurality of first-order planetary gears to rotate and revolve, and the movable second-stage ring gear receives the engagement of the plurality of second-order planetary gears The drive outputs a second-order deceleration power.    The self-locking speed reduction mechanism of claim 1, wherein the sun gear is coaxially fixed to an input shaft.    The self-locking speed reduction mechanism according to claim 1, wherein the second step ring gear is integrally formed at an end of a power output shaft.    The self-locking speed reduction mechanism according to claim 1, wherein the casing is formed by an upper casing and a lower casing, and the first-order ring gear is fixed to the upper casing and the lower casing. Between the casings.    The self-locking speed reduction mechanism of claim 4, wherein the first step ring gear is integrally formed on the upper casing and is fixed between the upper casing and the lower casing.    The self-locking speed reduction mechanism of claim 4, wherein the first step ring gear is integrally formed on the lower casing and is fixed between the upper casing and the lower casing.