CN111473094A

CN111473094A - Planetary transmission device

Info

Publication number: CN111473094A
Application number: CN202010391602.XA
Authority: CN
Inventors: 桂翔; 刘增民; 米中生; 陈春辉
Original assignee: Nanjing High Speed and Accurate Gear Group Co Ltd
Current assignee: Nanjing High Speed and Accurate Gear Group Co Ltd
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2020-07-31

Abstract

The invention discloses a planetary transmission device, which belongs to the technical field of mechanical transmission and comprises a first supporting part and a second supporting part which are fixedly arranged, a sun wheel component, an inner gear ring, a planetary wheel component and a planet carrier, wherein the sun wheel component comprises a sun wheel shaft and a sun wheel which are fixedly connected, and the sun wheel shaft is in floating connection with the first supporting part; the inner gear ring is in floating connection with the second supporting part and is of a flexible thin-wall structure; the planet wheel assembly comprises a planet wheel and a planet wheel shaft which are fixedly connected, the planet wheel is positioned between the sun wheel and the inner gear ring and is respectively meshed with the sun wheel and the inner gear ring, and the planet wheel shaft is arranged in a cantilever type; the planet wheel component is arranged on the planet carrier in a floating mode, and a play gap is formed between the planet wheel shaft and the planet carrier along the axial direction. Because the planet wheel assembly, the sun wheel shaft and the inner gear ring are in floating arrangement, the bearing capacity of the planet wheel is uniform, the deformation between the planet wheel shaft and the inner gear ring is mutually compensated, and the running is more uniform and more stable.

Description

Planetary transmission device

Technical Field

The invention relates to the technical field of mechanical transmission, in particular to a planetary transmission device.

Background

The planetary gear mechanism consists of a planet carrier, a sun gear, an internal gear and a plurality of planetary gears, wherein a plurality of planetary gear shafts are concentrically distributed on the planet carrier, and each planetary gear is arranged on the respective planetary gear shaft, so that each planetary gear can be meshed with the sun gear and the internal gear. Because the planetary gear mechanism has the advantages of compact structure, stable transmission, wide speed change range and the like, the planetary gear mechanism is widely applied to various mechanical equipment.

In the operation process, a plurality of planetary gears bear torque simultaneously, and the load borne by each planetary gear is uneven due to factors such as manufacturing, installation, elastic deformation of each part and the like, so that vibration and noise are caused, and the bearing capacity and the service life of the planetary gear train are influenced.

Disclosure of Invention

The invention aims to provide a planetary transmission device to solve the technical problems of large vibration and noise, low bearing capacity and short service life of a planetary gear train in the prior art.

As the conception, the technical scheme adopted by the invention is as follows:

the utility model provides a planetary transmission, includes fixed first supporting part and the second supporting part that sets up, still includes:

the sun wheel component comprises a sun wheel shaft and a sun wheel which are fixedly connected, and the sun wheel shaft is in floating connection with the first supporting part;

the inner gear ring is in floating connection with the second supporting part and is of a flexible thin-wall structure;

the planet wheel assembly comprises a planet wheel and a planet wheel shaft which are fixedly connected, the planet wheel is positioned between the sun wheel and the inner gear ring and respectively meshed with the sun wheel and the inner gear ring, and the planet wheel shaft is arranged in a cantilever manner;

the planet carrier, the planet wheel subassembly is floating to be installed on the planet carrier, have the float clearance along the axial between planet wheel axle and the planet carrier.

Wherein, first supporting part includes:

the fixing seat is provided with a step limiting surface;

the positioning ring is sleeved on the fixed seat and is abutted against the step limiting surface, and a floating gap is formed between the positioning ring and the fixed seat along the radial direction;

the sun wheel shaft is limited between the positioning ring and the first distance ring and has a play gap along the axial direction, and the sun wheel shaft and the first distance ring have a floating gap along the radial direction.

Wherein, there is the float clearance along the axial between first distance ring and the planet carrier.

Wherein the second support part includes:

the inner gear ring is circumferentially matched with the spline and has a floating gap along the radial direction;

the limiting column is configured to axially limit the inner gear ring, and a play gap is formed between the limiting column and the inner gear ring along the axial direction.

Wherein the planet wheel shaft is connected with the planet carrier through a first bearing assembly.

Wherein, still include:

the second distance ring is fixedly arranged on one side of the planet carrier;

and the first wear-resisting block is fixedly arranged at one end of the planet wheel shaft, and a play gap is formed between the second distance ring and the first wear-resisting block along the axial direction.

The second distance ring sleeve is arranged on the outer side of the sun gear in a sleeved mode.

The second distance ring with be provided with the third distance ring between the planet carrier, the second distance ring third distance ring with through bolted connection between the planet carrier.

And a second wear-resistant block is arranged on one side of the planet carrier close to the inner gear ring, and a play gap is formed between the inner gear ring and the second wear-resistant block along the axial direction.

Wherein a second bearing assembly is arranged on the outer side of the planet carrier.

The invention has the beneficial effects that:

according to the planetary transmission device provided by the invention, the planetary wheel component is arranged on the planetary carrier in a floating manner, the sun wheel shaft and the inner gear ring are arranged in a floating manner, the radial floating of the sun wheel shaft, the planetary wheel shaft and the inner gear ring is realized, and the sun wheel shaft, the planetary wheel shaft, the inner gear ring and the planetary carrier have certain axial play amount, so that the bearing capacity of the planetary wheel is uniform in the operation process. In addition, because the planet wheel shaft and the planet wheel are fixed into a whole, the planet wheel shaft is arranged in a cantilever type, the inner gear ring is in a flexible thin-wall structure, and the deformation between the planet wheel shaft and the inner gear ring is compensated with each other, so that the load is more uniform during operation, the stress is balanced, the system is more stable, and the vibration and the noise are further reduced.

Drawings

FIG. 1 is a cross-sectional view of a planetary transmission provided in accordance with an embodiment of the present invention;

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

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

fig. 4 is a partial structural schematic diagram of fig. 1.

In the figure:

1. a sun gear shaft;

2. an inner gear ring;

3. a planetary wheel shaft;

4. a planet carrier; 41. a second wear block;

51. a fixed seat; 52. a positioning ring; 53. a first pitch ring;

61. a spline; 62. a limiting column;

7. a first bearing assembly;

81. a second distance ring; 82. a first wear block; 83. a bolt; 84. a third distance ring;

9. a second bearing assembly.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Referring to fig. 1 to 4, an embodiment of the present invention provides a planetary transmission device, including a first supporting portion and a second supporting portion that are fixedly disposed, and further including a sun gear assembly, an inner gear ring 2, a planet gear assembly, and a planet carrier 4, where the sun gear assembly includes a sun gear shaft 1 and a sun gear that are fixedly connected, and the sun gear shaft 1 and the first supporting portion are connected in a floating manner; the inner gear ring 2 is connected with the second supporting part in a floating manner, and the inner gear ring 2 is of a flexible thin-wall structure; the planet wheel assembly comprises a planet wheel and a planet wheel shaft 3 which are fixedly connected, the planet wheel is positioned between the sun wheel and the inner gear ring 2 and is respectively meshed with the sun wheel and the inner gear ring 2, and the planet wheel shaft 3 is arranged in a cantilever type; the planet wheel component is arranged on the planet carrier 4 in a floating mode, and a play gap is formed between the planet wheel shaft 3 and the planet carrier 4 along the axial direction.

Because the planetary wheel assembly is arranged on the planet carrier 4 in a floating mode, and the sun wheel and the inner gear ring 2 are both arranged in a floating mode, the radial floating of the sun wheel shaft 1, the planetary wheel shaft 3 and the inner gear ring 2 is realized, and the sun wheel shaft 1, the planetary wheel shaft 3, the inner gear ring 2 and the planet carrier 4 have certain axial displacement, so that the bearing capacity of the planetary wheel is uniform in the operation process. In addition, because the planet wheel shaft 3 and the planet wheel are fixed into a whole, the planet wheel shaft 3 is arranged in a cantilever type, the inner gear ring 2 is in a flexible thin-wall structure, and the deformation between the planet wheel shaft 3 and the inner gear ring 2 is compensated with each other, so that the load is more uniform during operation, the stress is balanced, the system is more stable, and the vibration and the noise are further reduced.

Alternatively, the first support portion and the second support portion may be a housing, and the sun gear assembly and the ring gear 2 are both connected to the housing. The inner gear ring 2 is fixedly arranged, the sun wheel component is used as input, power is transmitted to the planet carrier 4 through the planet wheel component, the planet carrier 4 is used as output, and the sun wheel component, the planet wheel component and the planet carrier 4 are all arranged in a rotating mode.

The first supporting part comprises a fixed seat 51, a positioning ring 52 and a first distance ring 53, the fixed seat 51 is provided with a step limiting surface, the positioning ring 52 is sleeved on the fixed seat 51 and is abutted against the step limiting surface, and a floating gap is formed between the positioning ring 52 and the fixed seat 51 along the radial direction; the first distance ring 53 is disposed on one side of the fixed seat 51, the sun gear shaft 1 is limited between the positioning ring 52 and the first distance ring 53 and has a play gap along the axial direction, and the sun gear shaft 1 and the first distance ring 53 have a floating gap along the radial direction.

The positioning ring 52 and the first distance ring 53 are matched to axially limit the sun gear shaft 1, and as the sun gear shaft 1 is limited between the positioning ring 52 and the first distance ring 53 and has a play gap along the axial direction, a floating gap is formed between the sun gear shaft 1 and the first distance ring 53 along the radial direction, so that the floating connection between the sun gear shaft 1 and the first support part is realized.

The arrangement of the positioning ring 52 reduces the friction force between the sun gear shaft 1 and the fixed seat 51, and prolongs the service life. In particular, the retaining ring 52 is made of a wear-resistant material to ensure a service life.

In order to realize the matching among the sun wheel shaft 1, the positioning ring 52 and the fixed seat 51, a step surface is arranged on the inner wall of the sun wheel shaft 1, a play gap is formed between the step surface and the end surface of the positioning ring 52 along the axial direction, and the sun wheel shaft 1 and the fixed seat 51 are arranged at intervals along the radial direction to prevent the fixed seat 51 from interfering the sun wheel shaft 1.

Through pin connection between first distance ring 53 and fixing base 51, the installation of being convenient for is dismantled, can adjust the axial interval between first distance ring 53 and the fixing base 51 according to actual need. The first distance ring 53 is provided with a mounting hole, so that the first distance ring 53 can be conveniently mounted and dismounted.

The sun wheel and the sun wheel shaft 1 are integrally formed, so that the structural strength is ensured, the processing and the production are convenient, and the stress is balanced.

The second support portion comprises a spline 61 and a limit column 62, the inner gear ring 2 is circumferentially matched with the spline 61 and has a floating gap along the radial direction, the limit column 62 is configured to axially limit the inner gear ring 2, and a play gap is axially arranged between the limit column 62 and the inner gear ring 2.

The spline 61 circumferentially limits the inner gear ring 2 to prevent the inner gear ring 2 from rotating, and the limiting column 62 axially limits the inner gear ring 2 to prevent the inner gear ring 2 from shifting. The inner gear ring 2 and the spline 61 have a floating gap along the radial direction, and a play gap is formed between the limiting column 62 and the inner gear ring 2 along the axial direction, so that floating connection between the inner gear ring 2 and the second supporting part is realized.

Alternatively, a stepped surface is provided at the end of the internal gear ring 2, the stopper column 62 is provided on one side of the stepped surface, and the stopper column 62 can abut against the stepped surface to axially restrict the internal gear ring 2. Or, the limiting column 62 is disposed on one side of the end surface of the inner gear ring 2, and the limiting column 62 can be abutted against the end surface of the inner gear ring 2 to axially limit the inner gear ring 2.

Planet wheel and planet wheel axle 3 integrated into one piece, planet wheel axle 3 is greater than planet wheel along axial length, and the planet wheel is located between sun gear and ring gear 2, and planet wheel axle 3 is connected with planet carrier 4 for planet wheel axle 3 is the cantilever setting.

The planet wheel shaft 3 is connected with the planet carrier 4 through the first bearing assembly 7, the first bearing assembly 7 can bear radial force, and meanwhile, the cantilever is stressed, so that the planet wheel shaft 3 can float in the radial direction. Meanwhile, a play gap is formed between the planet wheel shaft 3 and the planet carrier 4 along the axial direction, so that the planet wheel assembly is arranged on the planet carrier 4 in a floating mode.

Specifically, the first bearing assembly 7 includes two bearings disposed at an interval to support the cantilever of the planetary wheel shaft 3.

The planetary transmission device further comprises a second distance ring 81 and a first wear-resistant block 82, wherein the second distance ring 81 is fixedly arranged on one side of the planet carrier 4; the first wear-resistant block 82 is fixedly disposed at one end of the planetary shaft 3, and a play gap is provided between the second distance ring 81 and the first wear-resistant block 82 along the axial direction. The second distance ring 81 and the first wear-resistant block 82 cooperate to provide a play gap between the planetary shaft 3 and the carrier 4 in the axial direction.

Specifically, the end of the planetary shaft 3 is provided with a groove, the first wear-resistant block 82 is fixedly connected with the groove, and part of the first wear-resistant block 82 protrudes out of the end face of the planetary shaft 3. The first wear-resistant block 82 is made of a wear-resistant material, so that direct friction between the second distance ring 81 and the planet wheel shaft 3 is prevented, the friction force is reduced, and the service life is prolonged.

The outer side of the planet carrier 4 is provided with a second bearing assembly 9, the second bearing assembly 9 providing support for the planet carrier 4. The second bearing assembly 9 may be a self-aligning bearing so that the planet carrier 4 has a radial float, which is self-adjusting.

The second distance ring 81 is sleeved outside the sun gear, so that the space is fully utilized, and the axial size is reduced. The second distance ring 81 does not interfere with the rotation of the sun wheel.

A third distance ring 84 is arranged between the second distance ring 81 and the planet carrier 4, and the second distance ring 81, the third distance ring 84 and the planet carrier 4 are connected through bolts 83, so that the second distance ring 81 and the planet carrier 4 are fixed. The axial length of the third distance ring 84 can be set according to actual needs, so that the size of the axial clearance can be adjusted conveniently. A washer may be fitted over bolt 83 to ensure stability.

In order to make the structure compact and make full use of the axial space, the planet carrier 4 is closer to the first distance ring 53, and a play gap is formed between the first distance ring 53 and the planet carrier 4 along the axial direction to provide a space for the axial play of the planet carrier 4. Furthermore, an oil groove may be provided on the side of the first distance ring 53 remote from the fixed seat 51, so that a gap is formed between the first distance ring 53 and the planet carrier 4 in the axial direction.

One side of the planet carrier 4 close to the ring gear 2 is provided with a second wear-resisting block 41, and a play gap is formed between the ring gear 2 and the second wear-resisting block 41 along the axial direction. The second wear-resistant block 41 is arranged to avoid direct contact between the planet carrier 4 and the inner gear ring 2, reduce friction force and prolong service life.

To sum up, all set up planetary wheel subassembly, sun gear subassembly and ring gear 2 to floating, have certain radial floating clearance and axial float clearance, and planet carrier 4 has certain axial float for in the operation process, the bearing capacity of planet wheel is even. In addition, because the planet wheel shaft 3 is arranged in a cantilever manner, the inner gear ring 2 is in a flexible thin-wall structure, and the deformation between the planet wheel shaft 3 and the inner gear ring 2 is compensated with each other, so that the running of the system is more uniform, the system is more stable, and the vibration and the noise are reduced.

The sizes of the radial floating gap and the axial play gap are not limited, and can be set according to actual conditions.

The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a planetary transmission, includes fixed first supporting part and the second supporting part that sets up, its characterized in that still includes:

the sun wheel assembly comprises a sun wheel shaft (1) and a sun wheel which are fixedly connected, and the sun wheel shaft (1) is in floating connection with the first supporting part;

the inner gear ring (2) is in floating connection with the second supporting part, and the inner gear ring (2) is of a flexible thin-wall structure;

the planet wheel assembly comprises a planet wheel and a planet wheel shaft (3) which are fixedly connected, the planet wheel is positioned between the sun wheel and the inner gear ring (2) and respectively meshed with the sun wheel and the inner gear ring (2), and the planet wheel shaft (3) is arranged in a cantilever type;

the planet carrier (4), the planet wheel subassembly is floating to be installed on planet carrier (4), have the float clearance along the axial between planet wheel axle (3) and planet carrier (4).

2. The planetary transmission as in claim 1, wherein the first support comprises:

the fixing seat (51), the said fixing seat (51) has limited surfaces of step;

the positioning ring (52) is sleeved on the fixed seat (51) and is abutted against the step limiting surface, and a floating gap is formed between the positioning ring (52) and the fixed seat (51) along the radial direction;

the first distance ring (53) is arranged on one side of the fixed seat (51), the sun wheel shaft (1) is limited between the positioning ring (52) and the first distance ring (53) and has a play gap along the axial direction, and the sun wheel shaft (1) and the first distance ring (53) have a floating gap along the radial direction.

3. Planetary transmission according to claim 2, characterized in that there is a play gap in axial direction between the first distance ring (53) and the planet carrier (4).

4. The planetary transmission as in claim 1, wherein the second support comprises:

a spline (61), wherein the inner gear ring (2) is circumferentially matched with the spline (61) and has a floating gap along the radial direction;

the limiting column (62) is configured to axially limit the inner gear ring (2), and a play gap is formed between the limiting column (62) and the inner gear ring (2) along the axial direction.

5. Planetary transmission according to claim 1, characterized in that the connection between the planet wheel shaft (3) and the planet carrier (4) is via a first bearing assembly (7).

6. The planetary transmission as in claim 5, further comprising:

a second distance ring (81) fixedly arranged on one side of the planet carrier (4);

and the first wear-resisting block (82) is fixedly arranged at one end of the planetary wheel shaft (3), and a play gap is formed between the second distance ring (81) and the first wear-resisting block (82) along the axial direction.

7. The planetary transmission according to claim 6, wherein the second distance ring (81) is arranged around the outside of the sun gear.

8. Planetary transmission according to claim 6, characterized in that a third distance ring (84) is arranged between the second distance ring (81) and the planet carrier (4), the second distance ring (81), the third distance ring (84) and the planet carrier (4) being connected by bolts (83).

9. Planetary transmission according to claim 1, characterized in that the planet carrier (4) is provided with a second wear-resistant block (41) on the side close to the ring gear (2), there being a play gap in the axial direction between the ring gear (2) and the second wear-resistant block (41).

10. A planetary transmission according to any of claims 1-9, characterized in that the planet carrier (4) is provided with a second bearing assembly (9) on the outside.