Simplified-assembly variable-pitch speed reducer structure

Abstract

The variable-pitch speed reducer structure provided by the utility model is simplified in assembly. The simply assembled variable pitch speed reducer structure comprises a first-stage planetary speed reduction stage, a second-stage planetary speed reduction stage, a third-stage planetary speed reduction stage and an output shaft which are sequentially connected, and a planet carrier of the first-stage planetary speed reduction stage is meshed with a sun gear of the second-stage planetary speed reduction stage. A planet carrier of the second-stage planetary reduction stage is meshed with a sun gear of the third-stage planetary reduction stage, a planet carrier of the third-stage planetary reduction stage is meshed with the output shaft, and the baffle is fixed to an inner hole of a planet carrier of the first-stage planetary reduction stage. Gaps exist between the two faces of the baffle and the sun gear of the first-stage planetary reduction stage and between the two faces of the baffle and the sun gear of the second-stage planetary reduction stage. According to the variable-pitch speed reducer structure with the simplified assembly, the problem that an existing variable-pitch speed reducer is complex in machining procedure and assembly process or unreliable in structural positioning of parts is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of speed reducer, concretely relates to a variable pitch speed reducer structure of simplifying assembly. BACKGROUND

[0002] The wind power blade variable pitch speed reducer is a key transmission component in a wind power generation system, which converts the high-speed low-torque rotation of a motor into low-speed high-torque rotation to drive a blade root bearing, so as to adjust the direction and angle of the wind power generator blade. The speed reducer contains multiple precision parts, such as gears, bearings, and sealing elements. Many common variable pitch speed reducers have the structure design of shaft end steps, snap spring grooves, baffles, top blocks, or ball tops, which are used for positioning while meeting the part machining property, but also make the part machining process more complex and the assembly steps more. SUMMARY

[0003] To solve the problems of complex machining process and assembly process or unreliable structure positioning of the existing variable pitch speed reducer, the utility model provides a variable pitch speed reducer structure of simplifying assembly to solve the above problems.

[0004] A variable pitch speed reducer structure of simplifying assembly, comprising a primary planetary reduction stage, a secondary planetary reduction stage, a tertiary planetary reduction stage, and an output shaft connected in sequence, the planetary carrier of the primary planetary reduction stage engages the sun gear of the secondary planetary reduction stage, the planetary carrier of the secondary planetary reduction stage engages the sun gear of the tertiary planetary reduction stage, the planetary carrier of the tertiary planetary reduction stage engages the output shaft, and further comprising a baffle, the baffle is fixed in the inner hole of the planetary carrier of the primary planetary reduction stage, and there is a gap between the two surfaces of the baffle and the sun gears of the primary planetary reduction stage and the secondary planetary reduction stage.

[0005] In a preferred embodiment of the variable pitch speed reducer structure of simplifying assembly provided by the utility model, the inner hole of the planetary carrier of the primary planetary reduction stage is provided with a step near one end of the sun gear of the primary planetary reduction stage, and the baffle is installed in the step by interference fit.

[0006] In a preferred embodiment of the simplified assembly variable pitch speed reducer structure, the sun gears of the first-stage planetary speed reduction stage, the second-stage planetary speed reduction stage and the third-stage planetary speed reduction stage are all cylindrical structures and integrally machined with gear structures.

[0007] In a preferred embodiment of the simplified assembly variable pitch speed reducer structure, the planet carrier of the first-stage planetary speed reduction stage, the planet carrier of the second-stage planetary speed reduction stage and the planet carrier of the third-stage planetary speed reduction stage abut in sequence, and the sun gears of the second-stage planetary speed reduction stage and the third-stage planetary speed reduction stage and the output shaft abut in sequence.

[0008] The sun gears of the first-stage planetary speed reduction stage, the second-stage planetary speed reduction stage and the third-stage planetary speed reduction stage are all low-roughness surfaces at both ends.

[0009] The planet carriers of the first-stage planetary speed reduction stage, the second-stage planetary speed reduction stage and the third-stage planetary speed reduction stage are all low-roughness positioning surfaces at large end surfaces and convex shaft end surfaces thereof, and the small end surface of the output shaft is a low-roughness surface.

[0010] In a preferred embodiment of the simplified assembly variable pitch speed reducer structure, the first end of the output shaft is machined with a spline, a spline sleeve is sleeved at the root position of the spline, and the end position of the spline is engaged with the planet carrier of the third-stage planetary speed reduction stage. The planet carrier of the third-stage planetary speed reduction stage abuts against the spline sleeve.

[0011] Compared with the prior art, the simplified assembly variable pitch speed reducer structure has the following beneficial effects:

[0012] 1. In the present application, baffles and spline sleeves are provided, all of the first-stage planetary speed reduction stage to the third-stage planetary speed reduction stage are tightly installed on the output shaft except the sun gear of the first-stage planetary speed reduction stage, the commonly used ball top, top block, snap spring and other parts for axial positioning of the traditional variable pitch speed reducer are reduced, the structure of the speed reducer as a whole is simpler, thereby simplifying assembly and improving production efficiency.

[0013] 2. The sun gears in the present application are all cylindrical structures and are machined with a spline shape penetrating through the entire cylinder at the side wall, having the advantages of simple structure and easy machining.

[0014] 3. The variable pitch speed reducer structure in the present application is compact, can effectively reduce the overall height and weight of the variable pitch speed reducer, and reduce the space occupied by the speed reducer in the fan hub. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a sectional view of the simplified assembly variable pitch speed reducer structure.

[0016] The figure labels: primary sun gear 11, primary planet gear 12, primary planet carrier 13, secondary sun gear 21, secondary planet gear 22, secondary planet carrier 23, tertiary sun gear 31, tertiary planet gear 32, tertiary planet carrier 33, output shaft 4, baffle 5 and gear sleeve 6. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments.

[0018] Please refer to Figure 1 It is the sectional view of the simplified assembly variable pitch speed reducer structure provided by the utility model.

[0019] The simplified assembly variable pitch speed reducer structure comprises a primary planetary reduction stage, a secondary planetary reduction stage, a tertiary planetary reduction stage, an output shaft 4, a baffle 5 and a gear sleeve 6. The primary planetary reduction stage comprises a primary sun gear 11, a primary planet gear 12 and a primary planet carrier 13; the secondary planetary reduction stage comprises a secondary sun gear 21, a secondary planet gear 22 and a secondary planet carrier 23; and the tertiary planetary reduction stage comprises a tertiary sun gear 31, a tertiary planet gear 32 and a tertiary planet carrier 33.

[0020] The primary sun gear 11, the secondary sun gear 21 and the tertiary sun gear 31 are all cylindrical bodies, the entire outer side wall of which is processed with a tooth shape and penetrates through the whole cylindrical body. The main body part of the primary planet carrier 13, the secondary planet carrier 23 and the tertiary planet carrier 33 are all disc-shaped structures, and an inner tooth hole is arranged in the middle of the main body part, which is used for engaging with the secondary sun gear 21 and the tertiary sun gear 31 and engaging with the output shaft 4; a plurality of upper convex shafts are arranged on the upper surface of the main body part at the edge position, which are used for mounting the primary planet gear 12, the secondary planet gear 22 and the tertiary planet gear 32 respectively.

[0021] The upper end of the primary sun gear 11 is connected with an input shaft, and the lower end is engaged with a plurality of primary planet gears 12, which drive the primary planet carrier 13 through the primary planet gears 12.

[0022] The inner tooth hole of the primary planet carrier 13 is provided with a step at the upper end, and the baffle 5 is mounted in the step in an interference fit manner. The upper and lower surfaces of the baffle 5 are respectively kept a small gap with the lower end surface of the primary sun gear 11 and the upper end surface of the secondary sun gear 21.

[0023] The upper end of the second sun gear 21 engages with the inner tooth hole of the first planetary carrier 13, the lower end engages with a plurality of second planetary gears 22, and the second planetary carrier 23 is driven through the second planetary gears 22. The upper end of the third sun gear 31 engages with the inner tooth hole of the second planetary carrier 23, the lower end engages with a plurality of third planetary gears 32, and the third planetary carrier 33 is driven through the third planetary gears 32. The upper end of the output shaft 4 is provided with a spline, and the spline is sequentially sleeved into the inner tooth hole of the tooth sleeve 6 and the third planetary carrier 33.

[0024] The lower end face of the second sun gear 21, the upper and lower end faces of the third sun gear 31, and the upper end face of the output shaft 4 are sequentially abutted. The lower end face of the first planetary carrier 13, the upper and lower end faces of the second planetary carrier 23, the upper and lower end faces of the third planetary carrier 33, and the tooth sleeve 6 are sequentially abutted. The tooth sleeve 6 is sleeved into the root of the spline of the output shaft 4 and is tightly abutted with the spline.

[0025] The upper and lower end faces of the first sun gear 11, the upper and lower end faces of the second sun gear 21, the upper and lower end faces of the third sun gear 31, the upper end face of the output shaft 4, the upper and lower end faces of the first planetary carrier 13, the upper and lower end faces of the second planetary carrier 23, and the upper and lower end faces of the third planetary carrier 33 are all machined into low-roughness faces. The faces such as the lower end face of the first sun gear 11 that do not participate in friction are not separately limited in process parameters, so as to simplify machining.

[0026] The above only describes the embodiments of the present application, and does not limit the patent range of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection range of the present application.

Claims

1. A simplified assembly variable pitch gearbox structure comprising a primary planetary reduction stage, a secondary planetary reduction stage, a tertiary planetary reduction stage and an output shaft connected in sequence, characterised in that: The planetary carrier of the first planetary reduction stage engages the sun gear of the second planetary reduction stage, the planetary carrier of the second planetary reduction stage engages the sun gear of the third planetary reduction stage, and the planetary carrier of the third planetary reduction stage engages the output shaft, and further comprising a baffle fixed in the inner hole of the planetary carrier of the first planetary reduction stage, and the baffle has a gap between the sun gear of the first planetary reduction stage and the sun gear of the second planetary reduction stage.

2. The simplified assembly variable pitch gearbox structure of claim 1, wherein: The inner hole of the planetary carrier of the first planetary reduction stage is provided with a step near one end of the sun gear of the first planetary reduction stage, and the baffle is fitted in the step.

3. The simplified assembly variable pitch gearbox structure of claim 1 or 2, wherein: The sun gears of the first planetary reduction stage, the second planetary reduction stage, and the third planetary reduction stage are all cylindrical structures and are integrally machined with gear structures.

4. The simplified assembly variable pitch reduction machine structure of claim 3, wherein: The planetary carriers of the first planetary reduction stage, the second planetary reduction stage, and the third planetary reduction stage are in contact in sequence, and the sun gears of the second planetary reduction stage and the third planetary reduction stage and the output shaft are in contact in sequence.

5. The simplified assembly variable pitch reduction machine structure of claim 4, wherein: The sun gears of the first planetary reduction stage, the second planetary reduction stage, and the third planetary reduction stage are all cylindrical structures and are integrally machined with gear structures. The sun gears of the first planetary reduction stage, the second planetary reduction stage, and the third planetary reduction stage are all cylindrical structures and are integrally machined with gear structures.

6. The simplified assembly variable pitch gearbox structure of claim 4 or 5, wherein: The large end faces of the planetary carriers of the first planetary reduction stage, the second planetary reduction stage, and the third planetary reduction stage and the convex shaft end faces thereon are all low-roughness positioning faces, and the small end face of the output shaft is a low-roughness face.

7. The simplified assembly variable pitch reduction machine structure of claim 6, wherein: The first end of the output shaft is machined with a spline, a toothed sleeve is sleeved at the root position of the spline, and the end position of the spline engages the planetary carrier of the third planetary reduction stage. The planetary carrier of the third planetary reduction stage is in contact with the toothed sleeve. The planetary carrier of the third planetary reduction stage is in contact with the toothed sleeve.

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