CN112728016A

CN112728016A - Planetary reducer

Info

Publication number: CN112728016A
Application number: CN202110008922.7A
Authority: CN
Inventors: 王小林
Original assignee: Guangzhou Ruibao Electrical Co ltd
Current assignee: Guangzhou Ruibao Electrical Co ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2021-04-30

Abstract

The invention relates to a planetary reducer. The planetary reducer comprises a shell, a planetary reduction set, an output shaft and a rear end cover; the planetary reduction set is arranged in the cylindrical space of the shell and comprises a planetary carrier and a planetary gear which is rotatably arranged on a positioning pin of the planetary carrier; the center of the planet gear is provided with a blind hole, and the planet gear is sleeved on the locating pin of the planet carrier through the blind hole and is separated from the planet carrier. The contact area of the top end face of the positioning pin and the planet gear is far smaller than that of the planet gear and the planet carrier when the planet gear is in contact with the planet carrier, so that friction when the planet gear rotates can be reduced, and the noise of the planetary speed reducer during working is reduced.

Description

Planetary reducer

Technical Field

The invention relates to a speed reducer, in particular to a planetary speed reducer.

Background

The planetary reduction gearbox (planetary reducer) is an industrial product with wide application, and can reduce the rotating speed of a motor and increase the output torque. The planetary gear set generally comprises a ring gear, a planet carrier, a planetary gear, a gasket, an output shaft and other structures. The center of the planet gear is provided with a through hole and is sleeved on the locating pin of the planet carrier through the through hole, however, the installation mode enables the planet gear to be in large-area contact with the planet carrier, so that the planet gear generates larger noise when moving relative to the planet carrier and diffuses to the outside of the planet reduction box.

Disclosure of Invention

In view of the above, the present invention has been developed to provide a planetary reducer that overcomes or at least partially solves the above-mentioned problems.

The planetary reducer includes:

the bearing device comprises a shell, a bearing seat and a bearing seat, wherein internal teeth are formed on the inner peripheral wall of a cylindrical space in the shell, a bearing chamber is formed at the front end of the shell, and an opening is formed at the rear end of the shell;

the planetary reduction set is arranged in the cylindrical space of the shell and comprises N planetary carriers and planetary gears which are rotatably arranged on positioning pins of the planetary carriers, wherein N is a positive number; a blind hole is formed in the center of the planet gear, and the planet gear is sleeved on the positioning pin of the planet carrier through the blind hole and is separated from the planet carrier; the planetary gear is meshed with the internal teeth of the inner peripheral wall of the cylindrical space;

the output shaft is supported by a bearing arranged in the bearing chamber, and the input end of the output shaft is inserted into the mounting hole in the center of the Nth-stage planet carrier;

and the rear end cover is fixedly arranged at the opening of the shell.

Optionally, the planet gear is formed with a first protrusion capable of abutting against the adjacent gasket on one side of the adjacent gasket.

Optionally, the first protrusion is located at the center of the side where the planet gear is located.

Optionally, the height of the first protrusion gradually decreases from the center to the periphery.

Optionally, the first protrusion is hemispherical or spherical crown shaped.

Optionally, a sun gear is fixed on the N-1 th stage planet carrier, a second bulge capable of abutting against the output shaft is formed on one side of the sun gear close to the adjacent N-1 th stage planet carrier, and N-1 is a positive number.

Optionally, the second protrusion is located at the center of the side where the sun gear is located.

Optionally, the height of the second protrusion gradually decreases from the center to the periphery.

Optionally, the second protrusion is hemispherical or spherical crown shaped.

Optionally, a sun gear is fixed on the M-1 th-stage planet carrier, a third protrusion capable of abutting against the M-th-stage planet carrier is formed on one side of the sun gear close to the adjacent M-th-stage planet carrier, M-1 is a positive number, and M is smaller than N.

Optionally, the third protrusion is located at the center of the side where the sun gear is located.

Optionally, the height of the third protrusion gradually decreases from the center to the periphery.

Optionally, the third protrusion is hemispherical or spherical crown shaped.

In the routine planetary reducer, each planetary gear is sleeved on the locating pin of the planetary carrier through the blind hole and is separated from the planetary carrier, so that the friction of the planetary gear during rotation can be reduced, and the noise of the planetary reducer during operation is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic structural diagram of an exemplary embodiment of a planetary reducer of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

FIG. 4 is an enlarged view of section C of FIG. 1;

fig. 5 is an exploded view of the planetary reducer of fig. 1.

Description of reference numerals: 1. a housing; 2. an output shaft; 3. a rear end cap; 4. a bearing; 5. a 1 st stage planet carrier; 6. positioning pins; 7. a 1 st stage planetary gear; 8. a 2 nd stage planet carrier; 9. a 2 nd stage planetary gear; 10. a sun gear; 11. a gasket; 12. a first protrusion; 13. a second protrusion; 14. a front end cover; 15. an inner gear ring; 16. and (4) screws.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below are exemplary embodiments for explaining the present invention with reference to the drawings and should not be construed as limiting the present invention, and those skilled in the art can make various changes, modifications, substitutions and alterations to the embodiments without departing from the principle and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

The terms "central," "longitudinal," "lateral," "length," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like, referred to or as may be referred to in the description of the invention, are used in the indicated orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the terms "comprises," "comprising," and any variations thereof, are intended to cover non-exclusive inclusions.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A planetary reducer according to an embodiment of the present invention is described below with reference to the accompanying drawings.

Referring to fig. 1 to 5, the planetary reducer according to the embodiment of the present invention includes a housing 1, a planetary reduction set, an output shaft 2, and a rear cover 3.

Internal teeth are formed on the inner peripheral wall of the cylindrical space inside the housing 1, a bearing chamber is formed at the front end of the housing 1, and an opening is formed at the rear end of the housing 1. Corresponding to the view of fig. 1, the upper end of the housing 1 is formed with a bearing chamber, and the lower end of the housing 1 is formed with an opening. Preferably, the bearing chamber comprises a first bearing chamber and a second bearing chamber, and the first bearing chamber and the second bearing chamber are respectively provided with a bearing 4.

The planetary reduction set is arranged in the cylindrical space of the shell 1 and comprises N planetary carriers and planetary gears which are rotatably arranged on positioning pins 6 of the planetary carriers, wherein N is a positive number. The planetary gear is engaged with the internal teeth of the inner peripheral wall of the cylindrical space.

In the present embodiment, N is 2, that is, the planetary reduction set is a two-stage planetary reduction set, which is a 1 st-stage planetary reduction set and a 2 nd-stage planetary reduction set. The 1 st-stage planetary reduction set comprises a 1 st-stage planet carrier 5 and a plurality of 1 st-stage planetary gears 7 which are rotatably arranged on positioning pins 6 of the 1 st-stage planet carrier 5. The 1 st-stage planetary gear 7 can be meshed with the inner teeth of the input gear sleeved on the rotating shaft of the motor and the inner circumferential wall of the cylindrical space. The 2 nd stage planetary reduction set includes a 2 nd stage planet carrier 8 (i.e., the last stage planet carrier), and a plurality of 2 nd stage planet gears 9 rotatably mounted to the dowel pins 6 of the 2 nd stage planet carrier 8. The 2 nd-stage planetary gear 9 is simultaneously engaged with the sun gear 10 fixed to the 1 st-stage carrier 5 and the internal teeth of the inner peripheral wall of the cylindrical space. When the input gear rotates, the input gear can drive all levels of planetary gears to walk on the inner peripheral wall of the cylindrical space, so that the 2 nd-level planet carrier 8 is driven to rotate.

Specifically, a blind hole is formed in the center of the planetary gear, and the planetary gear is sleeved on the positioning pin 6 of the planet carrier through the blind hole. Namely, blind holes are formed in the centers of the 1 st-stage planetary gear 7 and the 2 nd-stage planetary gear 9, and are sleeved on the positioning pin 6 through the blind holes. The length of the part of the positioning pin 6 extending out of the planet carrier is greater than the depth of the blind hole, so that each planet gear is separated from the corresponding planet carrier. The contact area of the top end face of the positioning pin 6 and the planetary gear is far smaller than that of the planetary gear and the planetary carrier when the planetary gear and the planetary carrier are in contact, so that the planetary gear is sleeved on the positioning pin 6 of the planetary carrier through the blind hole and is separated from the planetary carrier, friction when the planetary gear rotates can be reduced, and noise of the planetary reducer during working is reduced.

In the present embodiment, the planet gear is formed with a first protrusion 12 capable of abutting against the adjacent pad 11 on a side close to the pad 11. Compared with the view angle of fig. 1, the lower ends of the 1 st-stage planetary gear 7 and the 2 nd-stage planetary gear 9 are both formed with first protrusions 12, and the first protrusions 12 can abut against the adjacent gaskets 11, so that the contact area between the planetary gear and the adjacent gaskets 11 is reduced, friction is reduced, and noise generated during the operation of the planetary reducer is reduced.

Preferably, the first protrusion 12 is located at the center of the side where the planetary gear is located, and the height of the first protrusion 12 gradually decreases from the center to the periphery, for example, the first protrusion 12 is hemispherical, spherical crown-shaped, or the like. So as to reduce the length of the traveling track of the first protrusion 12 on the gasket 11 in the process of the planetary gear traveling on the inner peripheral wall of the cylindrical space, thereby reducing the noise of the planetary reducer during operation.

It should be understood that N may also be 1, 3, 4, 5 or other positive numbers, i.e., the planetary reduction set may also be a one-stage planetary reduction set, or a multi-stage planetary reduction set. The planetary gears rotatably arranged on the positioning pins of the planet carrier are provided with first bulges which can be abutted against the gaskets on one sides close to the adjacent gaskets, so that the contact area between the planetary gears and the adjacent gaskets is reduced, friction is reduced, and the noise of the planetary speed reducer during working is reduced.

The output shaft 2 is supported by a bearing 4 arranged in a bearing chamber, and the input end of the output shaft is inserted into a mounting hole in the center of the Nth-stage planet carrier. In the present embodiment, the input end of the output shaft 2 is inserted into a mounting hole at the center of the 2 nd stage planet carrier 8, that is, a mounting hole at the center of the last stage planet carrier. When the 2 nd-stage planet carrier 8 rotates, the output shaft 2 is driven to synchronously rotate. Since the number of teeth of the input gear and the number of teeth of the sun gear 10 are both smaller than the number of teeth of the internal teeth on the inner peripheral wall of the cylindrical space, the rotational speed of the output shaft 2 is smaller than the input gear rotational speed (motor rotational speed), but the output torque increases.

In this embodiment, since the 1 st-stage planetary reduction set has only three planetary gears and the contact area between the planetary gear and the adjacent pad 11 is small, part of the planetary gears are easily separated from the adjacent pad 11 during the rotation process, so that the 1 st-stage planetary carrier 5 is easily shaken and generates noise. To solve this problem, the sun gear 10 fixed on the 1 st-stage carrier 5 forms a second protrusion 13 capable of abutting against the output shaft 2 at a side close to the adjacent 2 nd-stage carrier 8, and the second protrusion 13 is formed at the upper end of the sun gear 10 relative to the view of fig. 1, and the second protrusion 13 adds a supporting point to the 1 st-stage carrier 5, so that the 1 st-stage carrier 5 operates more smoothly.

Preferably, the second protrusion 13 is located at the center of the side where the sun gear 10 is located, and the height of the second protrusion 13 gradually decreases from the center to the periphery, for example, the second protrusion 13 is hemispherical, spherical crown-shaped, or the like. The length of the traveling track of the second protrusion 13 on the output shaft 2 is reduced, the contact area between the second protrusion 13 and the output shaft 2 is reduced, and friction is reduced, so that the noise generated during the operation of the planetary reducer is reduced.

In an alternative embodiment, N ≧ 3, i.e., the planetary reduction set is a multi-stage planetary reduction set, and each of the 1 st through N-1 st stage planetary reduction sets has only three planetary gears. In order to solve the problem that the planet carriers of the 1 st to the N-1 st stages are easy to shake and generate noise, except that the sun gear fixed on the planet carrier of the N-1 st stage is provided with a second bulge capable of being abutted against the output shaft at one side close to the adjacent planet carrier of the N th stage (namely, the last planet carrier), the sun gears fixed on the planet carriers of the 1 st to the N-2 nd stages are provided with a third bulge capable of being abutted against the adjacent planet carrier of the upper stage at one side close to the adjacent planet carrier of the upper stage, namely, the sun gear fixed on the planet carrier of the M-1 st stage is provided with a third bulge capable of being abutted against the planet carrier of the M th stage at one side close to the adjacent planet carrier of the M th stage, wherein M is 2, 3, 4, … … and N-1. The corresponding third bulge increases a supporting point for the planet carriers of the 1 st stage to the N-2 nd stage, so that the planet carriers of the 1 st stage to the N-2 nd stage run more stably.

Preferably, the third protrusion is located at the center of the side where the sun gear is located, and the height of the third protrusion gradually decreases from the center to the periphery, for example, the third protrusion is hemispherical, spherical crown-shaped, or the like. The length of the walking track of the corresponding third bulge on the adjacent superior planet carrier is reduced, the contact area of the third bulge and the adjacent superior planet carrier is reduced, friction is reduced, and therefore noise of the planetary speed reducer during working is reduced.

The rear end cover 3 is fixedly arranged at the opening of the shell 1. In this embodiment, the housing 1 is composed of a front end cover 14 and an inner gear ring 15, the front end cover 14 and the inner gear ring 15 both form a plurality of through holes arranged in an annular array, the rear end cover 3 is provided with screw holes, and the roots of the screws 16 penetrate through the through holes of the front end cover 14 and the through holes of the inner gear ring 15 and then are matched with the screw holes to fix the front end cover 14, the inner gear ring 15 and the rear end cover 3. It should be understood that the front end cap 14, the inner ring gear 15 and the rear end cap 3 can be fixed in other suitable manners.

In the routine planetary reducer, each planetary gear is sleeved on the positioning pin 6 of the planetary carrier through the blind hole and is separated from the planetary carrier, so that friction during rotation of the planetary gear can be reduced, and noise during operation of the planetary reducer is reduced.

Claims

1. A planetary reducer, comprising:

and the rear end cover is fixedly arranged at the opening of the shell.

2. The planetary reducer according to claim 1, wherein: the planet gear is provided with a first bulge which can be abutted against the adjacent gasket on one side close to the gasket.

3. The planetary reducer according to claim 2, wherein: the first bulge is positioned at the center of the side surface where the planet gear is positioned.

4. The planetary reducer of claim 3, wherein: the height of the first bulge is gradually reduced from the center to the periphery.

5. The planetary reducer according to claim 2, wherein: a sun gear is fixed on the N-1 th-stage planet carrier, a second bulge capable of being abutted against the output shaft is formed on one side of the sun gear close to the adjacent N-stage planet carrier, and N-1 is a positive number.

6. The planetary reducer of claim 5, wherein: the second bulge is positioned at the center of the side surface where the sun gear is positioned.

7. The planetary reducer of claim 6, wherein: the height of the second protrusion is gradually reduced from the center to the periphery.

8. The planetary reducer according to claim 2, wherein: a sun gear is fixed on the M-1 stage planet carrier, a third bulge capable of being abutted against the M-stage planet carrier is formed on one side of the sun gear close to the adjacent M-stage planet carrier, M-1 is a positive number, and M is smaller than N.

9. The planetary reducer of claim 8, wherein: the third bulge is positioned at the center of the side surface where the sun gear is positioned.

10. The planetary reducer of claim 9, wherein: the height of the third bulge is gradually reduced from the center to the periphery.