Round nut anti-loosening structure of wind power speed reducer
By using non-standard round nuts and splined grooves in the wind power reducer, the problem of stress concentration of output shaft is solved, and the output shaft strength and locking reliability are improved.
Patent Information
- Application Number
- CN202422476470.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-10-14
AI Technical Summary
In the anti-loosening operation of existing wind power reducers, the flat keyways on the output shaft lead to concentrated stress, affecting the shaft fatigue strength and increasing the risk of breaking the shaft.
Non-standard round nuts are used to add limit slots and match steel balls with spline slots to avoid the output shaft processing flat keyways, and the anti-loosening function is achieved through the steel balls and planetary carrier limits.
Enhance the strength of the output shaft, improve the reliability of round nut locking, avoid stress concentration, and reduce the risk of shaft breakage.
Smart Images
Figure CN223063101U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wind power speed reducers, in particular to a locknut anti-loosening structure for a wind power speed reducer. Background Art
[0002] The wind power yaw and pitch speed reducer is an important component in a wind turbine generator set. With the development of large-power wind turbine generator sets, the load-bearing capacity requirements of wind power speed reducers are constantly increasing. When the wind power speed reducer is working, the output teeth of the speed reducer need to mesh with the slewing bearing gear ring, and the output shaft of the speed reducer needs to bear huge radial and axial forces.
[0003] At present, in the industry, two sets of tapered roller bearings are basically selected to support the output shaft, so a locknut is required to pre-tighten the tapered roller bearings. However, since the actual force direction of the speed reducer changes at any time, good anti-loosening operation on the locknut is also required. In the prior art, the wind power speed reducer basically uses a locknut stop washer for anti-loosening, which realizes the anti-loosening function by machining a flat keyway on the output shaft and clamping the locknut brake washer into the flat keyway.
[0004] However, the inventor of the present application found that in the existing anti-loosening operation, a flat keyway needs to be machined on the output shaft, and stress concentration will occur at the junction of the flat keyway and the shaft part of the output shaft, thereby affecting the fatigue strength of the shaft and increasing the risk of shaft breakage; and shaft breakage means that the entire speed reducer will not be able to be used, so there is a huge use risk. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a locknut anti-loosening structure for a wind power speed reducer, which can effectively enhance the strength of the output shaft and improve the locking reliability of the output shaft and the locknut.
[0006] To achieve the above purpose, the utility model adopts the following technical scheme:
[0007] A locknut anti-loosening structure for a wind power speed reducer, comprising: an output shaft connected to a planet carrier through a spline, the output shaft is provided with a large tapered bearing and a small tapered bearing, and the large tapered bearing and the small tapered bearing are used to support the output shaft and are locked with a non-standard locknut;
[0008] The non-standard locknut is made by adding 10-12 limiting grooves to a standard locknut, and the machining of the limiting grooves is carried out before the thread machining;
[0009] The spline is subjected to hobbing machining so that the output shaft has an arc-shaped spline groove, and steel balls are arranged at the middle of the arc-shaped spline groove and the non-standard locknut.
[0010] In actual application, the number of the steel balls is two, and an assembly gap not less than 0.5 mm is reserved around the steel balls.
[0011] Wherein, no flat key groove is machined on the output shaft any more.
[0012] Specifically, the output shaft has 35 spline teeth, the total number of the limiting grooves is 12, and the angle of the second limiting groove relative to the first limiting groove is 32.57°.
[0013] Furthermore, a lower box body is arranged on the outer sides of the large tapered bearing and the small tapered bearing.
[0014] Compared with the prior art, the round nut anti-loosening structure of the wind power speed reducer described in the present utility model has the following advantages:
[0015] In the round nut anti-loosening structure of the wind power speed reducer provided by the present utility model, when the non-standard round nut has a tendency to rotate, first, the non-standard round nut transmits the external force to the steel ball, and half of the steel ball is located in the spline groove of the output shaft, so as to transmit the external force to the output shaft, and the relative position between the non-standard round nut and the output shaft will not change, thus playing the function of preventing the round nut from loosening; and when the steel ball has an upward movement tendency, axial limiting is carried out by the planet carrier above the steel ball. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic cross-sectional structure view of the round nut anti-loosening structure of the wind power speed reducer provided by an embodiment of the present utility model;
[0017] Figure 2 is a schematic partial enlarged cross-sectional structure view of the round nut anti-loosening structure of the wind power speed reducer provided by an embodiment of the present utility model;
[0018] Figure 3 is a schematic assembly structure view of the non-standard round nut in the round nut anti-loosening structure of the wind power speed reducer provided by an embodiment of the present utility model;
[0019] Figure 4 is a schematic structure view of the non-standard round nut in the round nut anti-loosening structure of the wind power speed reducer provided by an embodiment of the present utility model.
[0020] REFERENCE SIGNS:
[0021] 1-output shaft; 2-small tapered bearing; 5-non-standard round nut; 6-steel ball; 7-planet carrier; 8-lower box body; 9-large tapered bearing. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] For the convenience of understanding, the round nut anti-loosening structure of the wind power speed reducer provided by an embodiment of the present utility model will be described in detail below with reference to the drawings in the specification.
[0023] An embodiment of the present utility model provides a locking structure for a round nut of a wind power speed reducer. As Figures 1 - 4 shown, it includes an output shaft 1 connected to a planet carrier 7 through a spline. The output shaft 1 is provided with a large tapered bearing 9 and a small tapered bearing 2, and the large tapered bearing 9 and the small tapered bearing 2 are used to support the output shaft 1, and a non-standard round nut 5 is used for locking;
[0024] The non-standard round nut 5 is made by adding 10 - 12 limiting grooves to a standard round nut, and the processing of the limiting grooves is carried out before the thread processing;
[0025] The spline is subjected to hobbing processing so that the output shaft 1 has an arc-shaped spline groove, and steel balls 6 are arranged at the middle part between the arc-shaped spline groove and the non-standard round nut 5.
[0026] Compared with the prior art, the locking structure for a round nut of the wind power speed reducer described in the embodiment of the present utility model has the following advantages:
[0027] In the locking structure for a round nut of the wind power speed reducer provided by the embodiment of the present utility model, when the non-standard round nut 5 has a tendency to rotate, first, the non-standard round nut 5 transmits the external force to the steel balls 6, and half of the steel balls 6 are located in the spline groove of the output shaft 1, so as to transmit the external force to the output shaft 1, and the relative position between the non-standard round nut 5 and the output shaft 1 will not change, thus achieving the function of preventing the round nut from loosening; and when the steel balls 6 have an upward movement tendency, axial limiting is carried out by the planet carrier 7 above the steel balls 6.
[0028] In actual application, as Figures 1 - 4 shown, the number of the above-mentioned steel balls 6 should not be too many or too few, and can preferably be two, and an assembly gap of not less than 0.5 mm is reserved around the steel balls 6, so as to facilitate assembly, facilitate installation, and avoid assembly difficulties caused by processing errors.
[0029] Among them, as Figures 1 - 4 shown, the above-mentioned output shaft 1 no longer needs to be processed with a flat key groove, so as to effectively reduce the risk of stress concentration in the shaft part.
[0030] Specifically, as Figures 1 - 4 shown, the above-mentioned output shaft 1 can have 35 spline teeth, then the total number of limiting grooves can be 12, and the angle of the second limiting groove relative to the first limiting groove can be 32.57° (360° / 35 * 3 + 360° / 35 / 6 = 32.57°), so as to strictly regulate the angular direction of the limiting grooves, and further effectively avoid the phenomenon that the limiting grooves and the spline grooves cannot be accurately aligned during the locking process of the non-standard round nut 5.
[0031] Furthermore, as Figures 1 - 4As shown, a lower box body 8 can be provided on the outer sides of the above-mentioned large tapered bearing 9 and small tapered bearing 2.
[0032] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the said claims.
Claims
1. A lock - loosening prevention structure for the round nut of a wind power speed reducer, characterized in that, Including: An output shaft connected to the planet carrier by splines, the output shaft is provided with a large tapered bearing and a small tapered bearing, and the large tapered bearing and the small tapered bearing are used to support the output shaft and are locked with a non-standard round nut; The non-standard round nut is made by adding 10-12 limiting grooves to a standard round nut, and the machining of the limiting grooves is carried out before the thread machining; The splines are subjected to hobbing to make the output shaft have an arc-shaped spline groove, and steel balls are arranged at the middle of the arc-shaped spline groove and the non-standard round nut.
2. The anti-loosening structure of the round nut of the wind power speed reducer according to claim 1, characterized in that, The number of the steel balls is two, and an assembly gap not less than 0.5 mm is reserved around the steel balls.
3. The anti-loosening structure of the round nut of the wind power speed reducer according to claim 1 or 2, characterized in that, The output shaft is no longer machined with a flat key groove.
4. The anti-loosening structure of the round nut of the wind power reducer according to claim 3, characterized in that, The output shaft has 35 spline teeth, the total number of the limiting grooves is 12, and the angle of the second limiting groove relative to the first limiting groove is 32.57°.
5. The anti-loosening structure of the round nut of the wind power reducer according to claim 1, wherein A lower housing is arranged outside the large tapered bearing and the small tapered bearing.