TWI395894B - Planetary reducer - Google Patents

Description

Planetary reducer

The invention relates to a planetary reducer, in particular to a planetary reducer which integrally forms a bearing outer ring at the output end and the input end on the inner wall of the casing, thereby achieving a reduction in volume and an assembly concentricity.

The general motor has a high speed. If it is used directly to drive the passive component, it will rotate too fast. It will not only provide a large torque, but also affect the strength and service life of the passive component. It will affect the convenience of operation. Therefore, the speed reducer is generally set on the motor output shaft to reduce the speed and output a large torque. However, there are many types of reducers. In addition to the traditional means of reducing gears through large and small gears, the most common ones are planetary gear reducers, such as China Patent Announcement No. 463892, Announcement No. 582461 and the United States. Patent No. 5,687,480, etc., has the greatest advantage in that it can overcome the problems of complicated structure, running noise and vibration of the conventional reducer, and is widely used in various occasions.

The planetary gear reducer is mainly composed of a planetary gear set in an inner toothed housing, and the planetary gear set with the output shaft is composed of a plurality of planetary gears with helical teeth, and the planetary gears are combined with the housing. The inner teeth are meshed, and a planetary gear set is connected to the planetary gear set, so that when the motor rotates, the planetary gears of the planetary gear set can be rotated relative to the housing, thereby achieving the purpose of reducing the output shaft speed.

However, since the planetary gear set must rotate relative to the housing, a bearing is disposed between the input end and the output end and the housing to reduce the running stress and friction between the planetary gear set and the housing. Please refer to the figure as shown in the fourth figure. Regardless of the type of bearing, it is necessary to form a number of L-shaped bearing seats for mounting the bearing on the inner wall of the housing. The bearing and the housing must be mounted in a tight fit. Therefore, the sidewall of the bearing housing must have considerable strength to withstand the radial stress during installation without deformation or cracking, so the thickness thereof is limited, and the overall diameter of the reducer (h2) is increased between the invisible; In order to position the bearing axially, the bearing housing must have a retaining edge extending radially from the inner wall of the housing. Thus, the axial length (w2) of the reducer is extended. Due to the increase in the axial and radial dimensions, the weight and volume of the reducer are increased, which is quite inconvenient for packaging transportation and installation. In the process of multiple processing and assembly, it is easy to cause the accumulation of tolerances, affecting the coaxial correspondence between the input end and the output end of the reducer. If the machine is operated for a long time under different conditions, it is easy to cause metal fatigue and reduce the speed reducer. Service life.

In view of this, the inventors have intensively explored the problems faced by the above-mentioned gear reducers through years of experience in R&D and manufacturing of related industries, and actively sought solutions. After long-term efforts and trials, they finally succeeded. The present invention was developed and designed.

The main object of the present invention is to solve the above problems and to provide a planetary reducer in which the bearing outer ring at the output end and the input end is integrally formed on the inner wall of the casing, thereby achieving a reduction in volume and an assembly concentricity.

In order to achieve the above object, the present invention mainly includes a housing in which a planetary gear set rotatable relative to the housing is coaxially mounted, the planetary gear set having a planetary arm frame and a plurality of annular pivots a planetary gear in the planetary boom, the output end of the planetary boom is coaxially extended with a power output shaft extending through the casing, and the output shaft is for outputting the torque after deceleration; the output end of the planetary boom and the input end are respectively The first bearing and the second bearing of the sleeve are pivoted in the housing; and the inner wall of the housing is formed with an internal tooth pattern that meshes with the tooth portion of the periphery of the planetary gear, and the input end of the planetary gear set of the planetary gear set The inner shaft is axially pivotally provided with a sun gear set connected to the motor by a third bearing, the sun gear set coaxially extending a sun gear synchronously acting on each of the planetary gears; wherein the first bearing and the second bearing system Each has an outer ring integrally formed on the inner wall of the casing; thus, not only material saving but also the weight and volume of the reducer are reduced, which facilitates packaging transportation and installation. The outer ring of the first and second bearings is completed in the same machining program, so that the concentricity is good and there is no cumulative tolerance, which does not affect the coaxial correspondence between the input end and the output end of the reducer, and can greatly shorten the deceleration. The service life of the machine.

The above and other objects and advantages of the present invention will be readily understood from

Of course, the invention may be varied on certain components, or in the arrangement of the components, but the selected embodiments are described in detail in the specification and their construction is shown in the drawings.

The invention relates to a planetary reducer which integrally forms a bearing outer ring at the output end and the input end on the inner wall of the casing, and thereby reduces the volume and improves the assembly concentricity, as described in the first to third The figure mainly includes a casing (10) coaxially mounted with a planetary gear set (2) rotatable relative to the casing (10), the planetary gear set (2) There is a planetary boom (20) and a plurality of planetary gears (25) pivotally disposed in the planetary boom (20), and the output end of the planetary boom (20) is coaxially extended with a through casing (10) The output shaft (21) is the torque for output deceleration. The output end and the input end of the planetary boom (20) are respectively pivoted in the casing (10) by using the first bearing (11) and the second bearing (12). Further, the inner wall of the casing (10) is formed with an internal tooth groove (15) that meshes with the peripheral tooth portion of the planetary gear (25), and the inner end of the planetary gear set (2) of the planetary arm frame (20) A sun gear set (3) connected to a motor (not shown) is axially pivoted by a third bearing (13), and the sun gear set (3) is coaxially extended to simultaneously act on the planetary gears (25). a sun gear (not shown) whereby the motor can drive the sun gear set (3) to simultaneously rotate the planet gears (25) through the sun gear, and through the deceleration of the planetary gear set (2), the output shaft (21) The output rotation speed is smaller than the rotation speed of the motor, and the reduction ratio is determined by the diameter of the planetary gear (25) and the diameter of the internal tooth (15). The above described and operational principle is similar to the existing planetary gear reduction mechanism, and is not a feature of the present invention, and will not be described again.

Regarding the technical means of the present invention, structural features and advantages are detailed below.

The basic type of a general rolling bearing, regardless of its type, usually includes rolling elements such as rollers, needles or balls; and an inner ring, an outer ring and a clamping element between the inner and outer rings for positioning the rolling elements. Cage. The conventional reducer usually has a bearing seat for mounting the bearing in its housing. Since the bearing and the housing must be mounted in a tight fit, the side wall of the bearing housing must have considerable strength to withstand the installation. The stress is not deformed or broken, so the thickness is limited. The integral diameter of the reducer is increased between the invisible parts. For the axial positioning of the bearing, the bearing housing must extend radially from the inner wall of the housing. The retaining edge, thus extending the axial length of the reducer. Due to the increase in the axial and radial dimensions, the weight and volume of the reducer are increased, which is quite inconvenient for packaging transportation and installation. In the process of multiple processing and assembly, it is easy to cause the accumulation of tolerances, affecting the coaxial correspondence between the input end and the output end of the reducer. If the machine is operated for a long time under different conditions, it is easy to cause metal fatigue and reduce the speed reducer. Service life.

The main feature of the present invention is that the first bearing (11) and the outer ring (111, 121) of the second bearing (12) are integrally formed on the inner wall of the casing (10). In this way, the bearing housing of the conventional reducer is an extra structure for the present invention, and the housing (10) corresponds to the thickness of the bearing (11, 12) without the need for a bearing housing. Can be greatly reduced, please also refer to the third and fourth figures, where h1 < h2; and because there is no need to limit the annular mounting flange of the bearing, the axial dimension of the housing (10) can also be For the purpose of reduction, please refer to the third and fourth figures at the same time. Among them, w1<w2 not only saves materials but also reduces the weight and volume of the reducer, which is convenient for packaging transportation and installation. The outer rings of the first and second bearings (11, 12) can be completed in the same machining program, so that the concentricity is good and there is no cumulative tolerance, which does not affect the coaxial correspondence between the input end and the output end of the reducer. , can greatly extend the service life of the reducer.

In the preferred embodiment of the present invention, the second bearing (12) is a ball bearing. Therefore, a ring groove (122) for receiving a portion of the ball is formed on the inner wall of the outer ring (121).

The above description of the embodiments is intended to be illustrative of the invention and is not intended to limit the scope of the invention.

From the above detailed description, those skilled in the art can understand that the present invention can achieve the foregoing objects, and no similar publications are found in similar processes or products, which have been in compliance with the provisions of the Patent Law, and have been patented according to law. Application.

10. . . case

11. . . First bearing

111. . . Outer ring

12. . . Second bearing

121. . . Outer ring

122. . . Ring groove

13. . . Third bearing

15. . . Internal tooth pattern

2. . . Planetary gear set

20. . . Planetary boom

twenty one. . . Output shaft

25. . . Planetary gear

3. . . Sun gear set

The first figure is a perspective cross-sectional view of the present invention.

The second drawing is a perspective exploded view of the present invention.

The third figure is a cross-sectional view of the present invention.

The fourth figure is a cross-sectional view of a conventional speed reducer.

10‧‧‧shell

11‧‧‧First bearing

12‧‧‧Second bearing

13‧‧‧ Third bearing

2‧‧‧ planetary gear set

20‧‧‧ Planetary boom

21‧‧‧Output shaft

25‧‧‧ planetary gear

3‧‧‧Sun Gear Set

Claims (2)

A planetary reducer mainly comprises a casing, wherein the casing is coaxially mounted with a planetary gear set rotatable relative to the casing, the planetary gear set having a planetary boom and a plurality of annular pivots on the planetary arm In the planetary gear of the frame, the output end of the planetary arm frame is coaxially extended with a power output shaft penetrating through the casing, and the output power shaft is used for outputting the torque after deceleration; the output end of the planetary arm frame and the input end are respectively utilized The first bearing and the second bearing are disposed in the housing; and the inner wall of the housing is formed with an internal tooth pattern that meshes with the tooth portion of the periphery of the planetary gear, and the internal end of the planetary gear set of the planetary arm frame A sun gear set connecting the motor is axially disposed by a third bearing, the sun gear set coaxially extending a sun gear synchronously acting on each of the planetary gears; wherein: the first bearing and the second bearing The outer ring system is integrally formed on the opposite position of the inner wall of the casing; thus, not only material saving but also the weight and volume of the reducer are reduced, which facilitates packaging transportation and installation; first and second axes Ring system in addition to the same machining program is completed, thus the case will not have good concentricity accumulated tolerance generated relative to the axial reducer does not affect the force and the end of the output terminal of the correspondence relationship, can significantly extend the life of the speed reducer. The planetary reducer according to claim 1, wherein the second bearing is a ball bearing, and a ring groove for accommodating a portion of the ball is formed on an inner wall of the outer ring.