Single planet carrier super large transmission ratio planetary transmission device

Abstract

The invention discloses a single planetary carrier super-large transmission ratio planetary transmission device, which comprises an inner gear ring, a planetary carrier, a planetary gear set and a sun gear set installed in a housing and a housing cover, and is characterized in that: three rows of coaxial planetary gears form a group, and three rows of coaxial sun gears form a group; the inner gear ring is installed in the housing, the planetary carrier is installed in the housing through a planetary carrier bearing, the planetary gear set is installed in the planetary carrier through a bearing, the three rows of planetary gears are distributed along the circumference of the planetary carrier rotation center, the sun gear set is installed in the housing cover through a bearing, the sun gear axis coincides with the planetary carrier rotation center, the planetary gear set is distributed along the circumference of the sun gear axis outside the sun gear set, the inner gear ring meshes with the planetary gear set, and the planetary gear set meshes with the sun gear set, and the single planetary carrier super-large transmission ratio planetary transmission device is formed as a whole. The invention adopts a single planetary carrier, realizes a relatively large transmission ratio without increasing much axial size, has flexible input and output modes, and has a more compact structure.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical transmission, and in particular relates to a single planet carrier super-large transmission ratio planetary transmission device. Background Art

[0002] Planetary transmission is used in all walks of life because of its compact structure, large load-bearing capacity, smooth and efficient transmission, easy installation and use, and long service life. With the continuous application of national energy conservation and emission reduction and new technologies, higher requirements are put forward for the high efficiency, miniaturization and high load-bearing of mechanical transmission mechanisms. Compared with ordinary parallel shaft gear transmission, planetary gear transmission has outstanding advantages in miniaturization and high load-bearing. Under the same load-bearing capacity, the weight ratio of planetary gear transmission device relative to ordinary parallel shaft gear transmission device is about 35%, and the volume ratio is about 25%. Due to structural limitations, the current planetary transmission device cannot make a large single-stage planetary transmission ratio. To achieve a relatively large transmission ratio, multi-stage planetary transmission is often required, and the axial size is large. For those occasions that require both a large transmission ratio and a compact structure, multi-stage planetary transmission is often not possible. Summary of the invention

[0003] The purpose of the present invention is to provide a single planet carrier super-large transmission ratio planetary transmission device, which only uses a single planet carrier and can easily achieve a relatively large transmission ratio without increasing the axial size much.

[0004] The technical solution of the present invention is: the planetary transmission device includes an inner ring gear, a planet carrier, a planetary gear set and a sun gear set installed in a casing and a casing cover, and is characterized in that: three rows of coaxial planetary gears form a group, and three rows of coaxial sun gears form a group; the inner ring gear is installed in the casing, the planet carrier is installed in the casing through a planet carrier bearing, the planetary gear set is installed in the planet carrier through a bearing, several groups of planetary gear sets are distributed along the circumference of the rotation center of the planet carrier, one of the sun gears in the sun gear set is installed in the casing cover through a bearing, and the other sun gears float in the planet carrier, the sun gear axis coincides with the rotation center of the planet carrier, the planetary gear set is distributed along the circumference of the sun gear axis on the outside of the sun gear set, the inner ring gear meshes with the planetary gear set, and the planetary gear set meshes with the sun gear set, forming a single planet carrier super-large transmission ratio planetary transmission device as a whole.

[0005] A further design is that each set of planetary gear sets includes an inner gear ring row planetary gear, a No. 1 planetary gear and a No. 2 planetary gear. The No. 1 planetary gear and the No. 2 planetary gear are combined into a direct-connected planetary gear. The direct-connected planetary gear is installed in the planetary carrier through a planetary gear bearing. The inner gear ring row planetary gear is installed on the direct-connected planetary gear through the inner bearing of the planetary gear. Each planetary gear set is distributed along the circumference of the rotation center of the planetary carrier; each set of sun gear sets includes a No. 1 sun gear, a No. 2 sun gear and a No. 3 sun gear. The No. 1 sun gear is installed in the box cover through a sun gear bearing. The axis of the No. 1 sun gear coincides with the rotation center of the planetary carrier. The No. 2 sun gear and the No. 3 sun gear are directly connected to form a direct connection The sun gear and the directly connected sun gear float in the directly connected planetary gears distributed along the circumference in the planetary carrier; the No. 1 sun gear meshes with the No. 1 planetary gear of its corresponding row, the No. 2 planetary gear meshes with the No. 3 sun gear, the No. 2 sun gear meshes with the planetary gears of the inner ring gear row, and the planetary gears of the inner ring gear row mesh with the inner ring gears of the same row; the No. 1 planetary gear drives the No. 2 planetary gear directly connected to it to rotate together, the No. 2 planetary gear drives the No. 3 sun gear meshed with it to rotate, the No. 3 sun gear drives the No. 2 sun gear directly connected to it to rotate, the No. 2 sun gear drives the planetary gears of the inner ring gear row meshed with it to rotate, and the planetary gears of the inner ring gear row and the inner ring gear of the same row jointly drive the planetary carrier to rotate.

[0006] A further design is that, according to needs, the planetary gear set and the sun gear set are arranged into a multi-row planetary gear structure with more than three rows.

[0007] The advantages of the present invention are:

[0008] 1. In the planetary transmission device, the sun gear, planet carrier and inner ring gear can all be used as input or output ends, which is flexible.

[0009] 2. A single planetary carrier is used to make full use of the soluble volume of the inner gear ring. Without increasing the axial size, it can meet the large transmission ratio requirements that can only be achieved by multi-stage planetary transmission. Compared with conventional planetary transmission, the structure is more compact. Under the condition of the same load-bearing capacity and relatively large transmission ratio (transmission ratio i ≥ 125), the weight ratio of this planetary transmission device relative to ordinary planetary gear transmission is about 68%, and the volume ratio is about 60%.

[0010] 3. When a planetary transmission device is provided with more than three rows of planetary gears and multiple rows of sun gears meshing with the planetary gears in the axial direction, the transmission ratio of the planetary transmission device will be increased many times, thereby achieving an ultra-large transmission ratio. Compared with ordinary planetary gear transmission, the weight ratio and volume ratio of the planetary transmission device will be smaller, and the structure will be more compact.

[0011] 4. In the planetary transmission device, when the pitch circle diameter of the driven wheel is larger than the pitch circle diameter of the driving wheel, when the inner ring gear or the planetary carrier is fixed, a relatively large speed ratio reduction output can be achieved; otherwise, a large speed ratio speed increase output can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention.

[0013] Figure 2 yes Figure 1 Another structural form of .

[0014] Figure 3 It is a schematic diagram of the multi-row planetary gear transmission structure of the present invention.

[0015] In the figure: 1 housing, 2 planetary gear bearings, 3 inner gear ring, 4 inner gear ring row planetary gears, 5 planetary gear inner bearings, 6 planet carrier, 7 directly connected planetary gears, 7a No. 1 planetary gear, 7b No. 2 planetary gear, 8 housing cover, 9 No. 1 sun gear, 10 sun gear bearings, 11 directly connected sun gear, 11a No. 2 sun gear, 11b No. 3 sun gear, 12 planet carrier bearings. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but this should not be construed as limiting the technical solution.

[0017] like Figure 1 , Figure 2 As shown, the planetary transmission device includes an inner gear ring 3, a planet carrier 6, a planetary gear set and a sun gear set installed in a housing 1 and a housing cover 8, and is characterized in that: three rows of coaxial planetary gears form a group, and three rows of coaxial sun gears form a group; the inner gear ring 3 is installed in the housing 1, the planet carrier 6 is installed in the housing 1 through a planetary carrier bearing 12, the planetary gear set is installed in the planet carrier 6 through a bearing, several groups of planetary gear sets are distributed along the circumference of the rotation center of the planet carrier 6, one of the sun gears in the sun gear set is installed in the housing cover 8 through a bearing, and the other sun gears float in the planet carrier 6, the sun gear axis coincides with the rotation center of the planet carrier, the planetary gear set is distributed on the outside of the sun gear set along the circumference of the sun gear axis, the inner gear ring 3 meshes with the planetary gear set, and the planetary gear set meshes with the sun gear set, forming a single planet carrier super-large transmission ratio planetary transmission device as a whole.

[0018] A further design is that each planetary gear set includes an inner ring gear row planetary gear 4, a No. 1 planetary gear 7a and a No. 2 planetary gear 7b, the No. 1 planetary gear 7a and the No. 2 planetary gear 7b are combined into a direct-connected planetary gear 7, the direct-connected planetary gear 7 is installed in the planetary carrier 6 through a planetary gear bearing 2, the inner ring gear row planetary gear 4 is installed on the direct-connected planetary gear 7 through a planetary gear inner bearing 5, and each planetary gear set is distributed along the circumference of the rotation center of the planetary carrier 6; each sun gear set includes a No. 1 sun gear 9, a No. 2 sun gear 11a and a No. 3 sun gear 11b, the No. 1 sun gear 9 is installed in the case cover 8 through a sun gear bearing 10, the axis of the No. 1 sun gear 9 coincides with the rotation center of the planetary carrier 6, and the No. 2 sun gear 11a and the No. 3 sun gear 11b are directly connected to form a direct-connected sun gear 11, the direct-connected sun gear 11 floats in the direct-connected planetary gears 7 distributed along the circumference in the planet carrier 6; the No. 1 sun gear 9 is meshed with the No. 1 planetary gear 7a of its corresponding row, the No. 2 planetary gear 7b is meshed with the No. 3 sun gear 11b, the No. 2 sun gear 11a is meshed with the inner ring gear row planetary gear 4, and the inner ring gear row planetary gear 4 is meshed with the inner ring gear 3 in the same row; the No. 1 planetary gear 7a drives the No. 2 planetary gear 7b directly connected to it to rotate together, the No. 2 planetary gear 7b drives the No. 3 sun gear 11b meshed with it to rotate, the No. 3 sun gear 11b drives the No. 2 sun gear 11a directly connected to it to rotate, the No. 2 sun gear 11a drives the inner ring gear row planetary gear 4 meshed with it to rotate, and the inner ring gear row planetary gear 4 and the inner ring gear 3 in the same row jointly drive the planet carrier 6 to rotate.

[0019] like Figure 3 As shown, the planetary gear set and the sun gear set are arranged into a multi-row planetary gear structure with more than three rows as required.

[0020] The working process of the planetary transmission device of the present invention is as follows:

[0021] During the reduction transmission, the No. 1 sun gear 9 with a smaller pitch circle diameter installed in the case cover 8 is used as the input end, the No. 1 sun gear 9 is meshed with the No. 1 planetary gear 7a of its corresponding row, the No. 1 planetary gear 7a drives the No. 2 planetary gear 7b directly connected to it to rotate together, the No. 2 planetary gear 7b drives the No. 3 sun gear 11b meshed with it to rotate, the No. 3 sun gear 11b drives the No. 2 sun gear 11a directly connected to it to rotate, the No. 2 sun gear 11a drives the inner ring gear row planetary gear 4 meshed with it to rotate, and the inner ring gear row planetary gear 4 is meshed with the inner ring gear 3 of the same row at the same time, and jointly drives the planet carrier 6 to rotate; in this process, along the meshing route, the smaller pitch circle diameter is used as the driving wheel, and the larger pitch circle diameter is used as the driven wheel, the pitch circle diameter of the driven wheel is larger than the pitch circle diameter of the driving wheel, when the inner ring gear 3 or the planet carrier 6 is fixed, a reduction output with a relatively large speed ratio is achieved.

[0022] When the speed-increasing transmission is used, it is the reverse process of the above process, that is, the input end becomes the output end, achieving a speed-increasing output with a relatively large speed ratio.

[0023] As required, when a multi-row planetary gear transmission with more than three rows of planetary gears is used, the transmission ratio will be increased multiple times according to the similar meshing form of the above three rows of planetary gears, thereby achieving an ultra-large transmission ratio.

Claims

1. A single planetary carrier super-large transmission ratio planetary transmission device, the planetary transmission device comprising an inner gear ring (3), a planetary carrier (6), a planetary gear set and a sun gear set installed in a housing (1) and a housing cover (8), wherein: Three rows of coaxial planetary gears form a group, and three rows of coaxial sun gears form a group; an inner gear ring (3) is installed in the housing (1), a planet carrier (6) is installed in the housing (1) via a planet carrier bearing (12), a planetary gear set is installed in the planet carrier (6) via a bearing, several sets of planetary gear sets are distributed along the circumference of the rotation center of the planet carrier (6), one of the sun gears in the sun gear set is installed in the housing cover (8) via a bearing, and the other sun gears float in the planet carrier (6), the sun gear axis coincides with the rotation center of the planet carrier, the planetary gear sets are distributed along the circumference of the sun gear axis on the outer side of the sun gear set, and the inner gear ring (3) meshes with the planetary gears. The planetary gear set meshes with the sun gear set, and the whole constitutes a single planet carrier super-large transmission ratio planetary transmission device; each planetary gear set includes an inner ring gear row planetary gear (4), a first planetary gear (7a) and a second planetary gear (7b); the first planetary gear (7a) and the second planetary gear (7b) are combined into a direct-connected planetary gear (7); the direct-connected planetary gear (7) is installed in the planet carrier (6) through a planetary gear bearing (2); the inner ring gear row planetary gear (4) is installed on the direct-connected planetary gear (7) through a planetary gear inner bearing (5); and the planetary gear sets are distributed along the circumference of the rotation center of the planet carrier (6); each sun gear set includes a first planetary gear (7a); and the second planetary gear (7b) is installed on the planetary gear (7) through a planetary gear inner bearing (5). The sun gear (9), the second sun gear (11a) and the third sun gear (11b) are provided. The first sun gear (9) is installed in the case cover (8) through a sun gear bearing (10). The axis of the first sun gear (9) coincides with the rotation center of the planet carrier (6). The second sun gear (11a) and the third sun gear (11b) are directly connected to form a directly connected sun gear (11). The directly connected sun gear (11) floats in the directly connected planetary gears (7) distributed along the circumference in the planet carrier (6). The first sun gear (9) meshes with the first planetary gear (7a) in the corresponding row, and the second planetary gear (7b) meshes with the third sun gear (11 b), the second sun gear (11a) meshes with the inner gear ring row planetary gear (4), and the inner gear ring row planetary gear 4 meshes with the inner gear ring (3) in the same row; the first planetary gear (7a) drives the second planetary gear (7b) directly connected thereto to rotate together, the second planetary gear 7b drives the third sun gear (11b) meshed therewith to rotate, the third sun gear (11b) drives the second sun gear (11a) directly connected thereto to rotate, the second sun gear (11a) drives the inner gear ring row planetary gear (4) meshed therewith to rotate, and the inner gear ring row planetary gear (4) and the inner gear ring (3) in the same row jointly drive the planet carrier (6) to rotate.

2. The single planet carrier super-large transmission ratio planetary transmission device according to claim 1, characterized in that: As required, the planetary gear set and the sun gear set are arranged into a multi-row planetary gear structure with more than three rows.

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