Planetary gearbox

Abstract

The utility model relates to a kind of planetary gear box, belong to gear box technical field.The gear box includes box, input shaft, at least one set of planetary gear set and output shaft.The inner ring of planetary bearing in planetary gear set is integrally formed with planetary wheel axle, outer ring and planetary gear respectively, reduce the number of parts, make structure more compact, reduce weight, reduce volume.The upper level sun gear is fixedly connected with the lower level planet carrier, shortens transmission path, improves transmission efficiency.In addition, it is also provided with last stage driving wheel, output gear, planet carrier bearing and other structures, realizes speed change, limiting and other functions, overall reduce cost while improving the comprehensive performance of gear box.

Claims

1. A planetary gearbox, characterized in that, The device includes a housing, within which are sequentially connected an input shaft, at least one set of planetary gears, and an output shaft. The planetary gear set includes a planet carrier, planetary gear shafts, planetary gears, and a sun gear. The planetary gear shafts are fixed to the planet carrier, and the planetary gears are mounted on the planetary gear shafts via planetary bearings. An internal gear ring is provided in the housing at a position adapted to the planetary gears. The planetary gears simultaneously mesh with the sun gear and the internal gear ring. The inner ring of the planetary bearing is integrally formed with the planetary gear shaft, and the outer ring of the planetary bearing is integrally formed with the planetary gears. Rolling elements are provided between the inner and outer rings of the planetary bearing.

2. A planetary gearbox as claimed in claim 1, characterised in that, The sun gear described in the previous stage is fixedly connected to the planet carrier described in the next stage.

3. A planetary gearbox as claimed in claim 2, characterised in that, The planetary gear set is made of medium carbon steel, and the outer surface of the planetary gear shaft and the inner surface of the planetary gear are subjected to surface hardening treatment.

4. The planetary gearbox according to claim 1, characterized in that, The planetary gear set includes a first-stage planetary gear set, a second-stage planetary gear set, and a third-stage planetary gear set; The first-stage planetary gear set includes a first-stage sun gear, a first-stage planetary gear, a first-stage planetary carrier, and a first-stage planetary shaft; the input shaft is fixedly connected to the first-stage planetary carrier, the first-stage sun gear meshes with multiple first-stage planetary gears, the first-stage planetary gears simultaneously mesh with a first internal gear ring mounted on the housing, and the first-stage planetary gears are rotatably mounted on the first-stage planetary shaft via planetary bearings. The secondary planetary gear set includes a secondary sun gear, secondary planetary gears, a secondary planetary carrier, and a secondary planetary shaft; the primary sun gear is fixedly connected to the secondary planetary carrier, the secondary sun gear meshes with multiple secondary planetary gears, the secondary planetary gears simultaneously mesh with a second internal gear ring mounted on the housing, and the secondary planetary gears are rotatably mounted on the secondary planetary shaft via planetary bearings; The three-stage planetary gear set includes a three-stage sun gear, a three-stage planetary gear, a three-stage planetary carrier, and a three-stage planetary shaft; the two-stage sun gear is fixedly connected to the three-stage planetary carrier, the three-stage sun gear meshes with multiple three-stage planetary gears, the three-stage planetary gears mesh with a third internal gear ring set on the housing, and the three-stage planetary gears are rotatably mounted on the three-stage planetary shaft through planetary bearings. The third-stage sun gear is fixedly connected to the final-stage driving gear. The housing is provided with an output shaft via the final-stage bearing. An output gear is fixedly provided on the output shaft. The final-stage driving gear meshes with the output gear.

5. A planetary gearbox as claimed in claim 4, characterised in that, The outer diameter of the final stage driving gear is greater than the outer diameter of the third stage sun gear, and the outer diameter of the output gear is smaller than the outer diameter of the final stage driving gear.

6. The planetary gearbox of claim 4, wherein, The inner ring of the final stage bearing is integrally formed with the output shaft, and the outer ring of the final stage bearing is integrally formed with the housing.

7. A planetary gearbox as claimed in claim 6, characterised in that, The inner and outer rings of the final stage bearing are processed by surface hardening.

8. The planetary gearbox of claim 4, wherein, The outer contours of the secondary and tertiary planetary carriers are surface hardened to form the inner rings of the bearings, and the inner surface of the housing is surface hardened to form the outer rings of the bearings at the positions that match the outer contours of the planetary carriers. Rolling elements are provided between them to form a planetary carrier bearing.

9. A planetary gearbox as claimed in claim 8, characterised in that, The outer contour of the secondary planetary carrier and / or the tertiary planetary carrier is provided with a first radial protrusion, the housing is provided with a second radial protrusion, and the rolling element is axially disposed between the first radial protrusion and the second radial protrusion.

Images