Low-speed-level structure of variable-pitch speed reducer

Abstract

A low-speed-stage structure of a variable-pitch speed reducer comprises a final-stage sun gear coaxially connected with an upper-stage planet carrier, a final-stage planet gear meshed with the final-stage sun gear, a final-stage planet carrier connected with the final-stage planet gear, an output gear shaft in spline connection with the final-stage planet carrier, and a bearing supporting the output gear shaft in a speed reducer box body. The speed reducer is characterized in that the speed reducer further comprises a locking and stopping assembly fastened to the top of the output gear shaft in a threaded fit mode, the locking and stopping assembly abuts against the last-stage planet carrier, and the last-stage planet carrier is pressed on the bearing in the axial direction. The axial positioning structure of the last-stage planet carrier is more compact, the space occupancy rate is smaller, the reliability and stability of axial positioning of the last-stage planet carrier are improved, axial movement of the last-stage planet carrier is avoided, and the operation stability and reliability of the variable-pitch speed reducer are improved; therefore, the efficiency of the speed reducer is improved, the service life of the speed reducer is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to a low-speed stage structure of a variable pitch reducer, belonging to the technical field of variable pitch reducer assembly. Background Art

[0002] The wind turbine blade pitch reducer is a key transmission component in the wind power generation system. It converts the high-speed and low-torque rotation of the motor into the low-speed and high-torque rotation of the driving blade root bearing to adjust the direction and angle of the wind turbine blades. The reducer contains multiple precision parts such as gears, bearings and seals, which require precise axial positioning to ensure the stable operation of the system. The reliability of axial positioning directly affects the overall performance and life of the reducer. The clearance control and dimensional chain control are equally important for the reducer, which is related to the relationship between the internal parts of the reducer and the overall dimensional accuracy. The precise control of the clearance control and dimensional chain helps to improve the efficiency and life of the reducer and reduce maintenance costs.

[0003] In the low-speed stage structure of the existing variable pitch reducer, such as Figure 1 As shown, the lower end of the final planetary carrier is positioned by a gear sleeve positioned on the output gear shaft, and the upper end is positioned by a top block matched with the final sun gear, a ball top matched with the top block, and a baffle matched with the ball top, so that the axial positioning structure of the final sun gear has a large space occupancy rate, and the cooperation of the ball top, the top block, and the baffle increases the number of component rings in the overall dimension chain of the variable pitch reducer, which is not conducive to the precise control of the closing clearance, and the final sun gear is positioned by layer-by-layer compression of the upper sun gear. When there is a closing clearance between the upper sun gears, the ball top, the top block, and the baffle will produce axial movement during the operation of the reducer, so that the final planetary carrier will also form axial movement, and the axial positioning reliability of the final planetary carrier is poor, which not only accelerates the wear of the final planetary carrier, but also produces impact noise during the operation of the reducer, reducing the operating stability and reliability of the variable pitch reducer. Utility Model Content

[0004] The low-speed stage structure of the variable-pitch reducer provided by the utility model not only makes the axial positioning structure of the final-stage planetary frame more compact and occupies less space, but also avoids the axial positioning of the final-stage planetary frame being affected by the clearance between the upper-stage sun gears, thereby improving the reliability and stability of the axial positioning of the final-stage planetary frame, avoiding its axial movement, and improving the operating stability and reliability of the variable-pitch reducer; it can reduce the number of component rings in the overall dimension chain of the variable-pitch reducer, which is beneficial to the precise control of the clearance between the upper-stage sun gears, thereby improving the efficiency and life of the reducer and reducing maintenance costs.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The low-speed stage structure of the variable pitch reducer includes a final sun gear coaxially connected to the upper-stage planetary carrier, a final planetary gear meshing with the final sun gear, a final planetary carrier connected to the final planetary gear, an output gear shaft spline-connected to the final planetary carrier, and a bearing supporting the output gear shaft in a reducer housing, wherein the bottom surface of the bearing abuts against the inner wall of the reducer housing, and is characterized in that it also includes a locking and stopping assembly threadedly fastened to the top of the output gear shaft, the locking and stopping assembly abuts against the final planetary carrier stage, and presses the final planetary carrier axially onto the bearing.

[0007] Preferably, the output gear shaft has an external spline section that cooperates with the final planetary carrier and a top thread section located at the top of the output gear shaft, the outer diameter of the top thread section is smaller than the outer diameter of the external spline section, an annular step surface is formed between the top thread section and the external spline section, and the locking and stopping assembly is fastened to the top thread section and abuts against the annular step surface.

[0008] Preferably, the last-stage planet carrier is provided with an annular positioning surface located at the outer periphery of the annular step surface, the last-stage planet carrier is sleeved on the outer spline segment and placed on the bearing, and the locking and stopping assembly abuts against the annular positioning surface.

[0009] Preferably, the locking and stopping assembly comprises a retaining ring, a stop washer and a round nut cooperating with the top threaded section, which are sequentially sleeved on the top threaded section from bottom to top. The retaining ring is pressed against the annular step surface and the annular positioning surface as the round nut is tightened, and the stop washer is respectively inserted into the output gear shaft and the round nut.

[0010] Preferably, a slot is provided on the top threaded section to be snap-fitted with the inner side of the stop washer, and a slot is provided on the round nut to be snap-fitted with the outer side of the stop washer.

[0011] The beneficial effects of the utility model are:

[0012] The utility model discloses a variable pitch reducer low-speed stage structure, the top thread of the output gear shaft cooperates to tighten the locking and stopping assembly, the locking and stopping assembly presses the final planetary carrier axially on the bearing, and axially positions the final planetary carrier, and forms a rigid connection and positioning of the final planetary carrier by tightening the locking and stopping assembly on the output gear shaft, which not only makes the axial positioning structure of the final planetary carrier more compact and has a smaller space occupancy rate, but also avoids the axial positioning of the final planetary carrier being affected by the clearance between the upper sun gear and the closing box, thereby improving the reliability and stability of the axial positioning of the final planetary carrier, avoiding its axial movement, and improving the running stability and reliability of the variable pitch reducer; the final planetary carrier is tightly positioned by the locking and stopping assembly, and compared with the structure of pressing and positioning from top to bottom in the prior art, the number of constituent rings in the overall dimension chain of the variable pitch reducer can be reduced, which is beneficial to the precise control of the clearance between the closing box, thereby improving the efficiency and life of the reducer, and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the low-speed stage structure of a variable pitch reducer in the prior art.

[0014] Figure 2 It is a schematic diagram of the low-speed stage structure of the variable pitch reducer of the utility model.

[0015] Figure 3 Schematic diagram of the final stage planet carrier.

[0016] Figure 4 Schematic diagram of the output gear shaft. DETAILED DESCRIPTION

[0017] Combine the following Figures 2~4 The embodiments of the present utility model are described in detail.

[0018] The low-speed stage structure of the variable pitch reducer includes a final sun gear 1 coaxially connected to the upper-stage planetary carrier, a final planetary gear 2 meshing with the final sun gear 1, a final planetary carrier 3 connected to the final planetary gear 2, an output gear shaft 4 spline-connected to the final planetary carrier 3, and a bearing 6 supporting the output gear shaft 4 in a reducer housing 5, wherein the bottom surface of the bearing 6 abuts against the inner wall of the reducer housing 5, and is characterized in that it also includes a locking and stopping assembly 7 threadedly fastened to the top of the output gear shaft, the locking and stopping assembly 7 abuts against the final planetary carrier stage 3, and presses the final planetary carrier 3 axially onto the bearing 6.

[0019] In the low-speed stage structure of the variable pitch reducer described above, the top thread of the output gear shaft 4 is matched to tighten the locking and stopping assembly 7, and the locking and stopping assembly 7 presses the final planetary carrier 3 axially on the bearing 6 to axially position the final planetary carrier 3. The locking and stopping assembly 7 is fastened to the output gear shaft 4 to form a rigid connection and positioning of the final planetary carrier 3, which not only makes the axial positioning structure of the final planetary carrier 3 more compact and has a smaller space occupancy rate, but also avoids the axial positioning of the final planetary carrier 3 from being affected by the clearance between the upper sun gears, improves the reliability and stability of the axial positioning of the final planetary carrier 3, avoids its axial movement, and improves the operating stability and reliability of the variable pitch reducer; the final planetary carrier 3 is tightly positioned by the locking and stopping assembly 7, compared with the structure of pressing and positioning from top to bottom in the prior art, the number of constituent rings in the overall dimension chain of the variable pitch reducer can be reduced, which is conducive to the precise control of the clearance between the boxes, thereby improving the efficiency and life of the reducer and reducing maintenance costs.

[0020] Among them, the output gear shaft 4 has an external spline segment 41 that cooperates with the final planetary carrier 3 and a top thread segment 42 located at the top of the output gear shaft 4. The outer diameter of the top thread segment 42 is smaller than the outer diameter of the external spline segment 41. An annular step surface 43 is formed between the top thread segment 42 and the external spline segment 41. The locking and stopping assembly 7 is fastened to the top thread segment 42 and abuts against the annular step surface 43. The outer spline section 41 on the output gear shaft 4 cooperates with the inner spline of the inner ring of the final planetary carrier 3, and the top threaded section 42 cooperates with the thread of the locking and stopping assembly 7. When the locking and stopping assembly 7 is tightened, it will abut against the annular step surface 43 to form a tightening, and press the final planetary carrier 3 axially onto the bearing 6. The final planetary carrier 3 is clamped between the locking and stopping assembly 7 and the bearing 6, and the bearing 6 abuts against the inner wall of the reduction body housing 5. When the locking and stopping assembly 6 is tightened into place, a rigid positioning of the final planetary carrier 3 is formed, and the final planetary carrier 3 will not move axially, and the positioning reliability is high and the stability is good, which reduces the wear of the final planetary carrier 3 and avoids the impact noise caused by the movement of the final planetary carrier 3.

[0021] The final planet carrier 3 is provided with an annular positioning surface 31 located on the outer periphery of the annular step surface 43, the final planet carrier 3 is sleeved on the outer spline segment 41 and placed on the bearing 6, and the locking and stopping assembly 7 abuts against the annular positioning surface 31. The final planet carrier 3 is provided with an annular positioning surface 31 located on the outer periphery of the annular step surface 43, and the locking and stopping assembly abuts against the annular positioning surface 31 after being tightened, so as to press the final planet carrier 3 against the bearing 6.

[0022] The locking and stopping assembly 7 includes a retaining ring 71, a retaining washer 72 and a round nut 73 matched with the top threaded section, which are sequentially sleeved on the top threaded section from bottom to top. The retaining ring 71 is pressed against the annular step surface 43 and the annular positioning surface 31 as the round nut 73 is tightened, and the retaining washer 72 is respectively inserted into the output gear shaft 4 and the round nut 73. After the round nut 72 is tightened, the retaining ring 71 is pressed against the annular step surface 43 and the annular positioning surface 31. The retaining washer 72 is used to limit the rotation of the round nut 73 relative to the output gear shaft 4 to prevent the round nut 73 from loosening, thereby ensuring the fastening reliability of the locking and stopping assembly 7, thereby ensuring the reliability and stability of the axial positioning of the final planet carrier 3.

[0023] The top threaded section 42 is provided with a slot 421 which is snap-fitted with the inner side of the stop washer 72, and the round nut 72 is provided with a slot which is snap-fitted with the outer side of the stop washer 72. When installing the final planet carrier 3, the final planet carrier 3 is firstly sleeved on the outer spline section 41, and the bottom surface of the final planet carrier 3 is against the bearing 6, and then the retaining ring 71 is sleeved on the top threaded section 42 and placed on the annular step surface 43 and the annular positioning surface 31, and then the stop washer 72 is installed, so that the inner side snap-fits into the slot 421 on the top threaded section 42, and then the round nut 73 is screwed into the top threaded section 42, and after the round nut 73 is screwed to a suitable position, the outer side snap-fits the stop washer 72 into the slot of the round nut 6 to prevent the round nut 6 from loosening, so as to ensure the reliability and stability of the locking and stopping assembly 7 in axial positioning of the final planet carrier 3.

[0024] The above is a complete description of the technical solutions of the embodiments of the utility model in combination with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. The low-speed stage structure of the variable pitch reducer includes a final sun gear coaxially connected to the previous planetary carrier, a final planetary gear meshing with the final sun gear, a final planetary carrier connected to the final planetary gear, an output gear shaft splined to the final planetary carrier, and a bearing supporting the output gear shaft in the reducer housing, wherein the bottom surface of the bearing abuts against the inner wall of the reducer housing, and is characterized in that: It also includes a locking and stopping assembly threadedly fastened to the top of the output gear shaft, the locking and stopping assembly abuts against the last planet carrier stage, and presses the last planet carrier axially onto the bearing.

2. The low-speed stage structure of the variable pitch reducer according to claim 1 is characterized in that: The output gear shaft has an external spline section that cooperates with the final planetary carrier and a top thread section located at the top of the output gear shaft. The outer diameter of the top thread section is smaller than the outer diameter of the external spline section. An annular step surface is formed between the top thread section and the external spline section. The locking and stopping assembly is fastened to the top thread section and abuts against the annular step surface.

3. The low-speed stage structure of the variable pitch reducer according to claim 2 is characterized in that: The last-stage planet carrier is provided with an annular positioning surface located on the outer periphery of the annular step surface, the last-stage planet carrier is sleeved on the outer spline segment and placed on the bearing, and the locking and stopping assembly abuts against the annular positioning surface.

4. The low-speed stage structure of the variable pitch reducer according to claim 3 is characterized in that: The locking and stopping assembly comprises a retaining ring, a stop washer and a round nut matched with the top threaded section, which are sequentially sleeved on the top threaded section from bottom to top. The retaining ring is pressed against the annular step surface and the annular positioning surface as the round nut is tightened, and the stop washer is respectively inserted into the output gear shaft and the round nut.

5. The low-speed stage structure of the variable pitch reducer according to claim 4 is characterized in that: The top threaded section is provided with a slot which is snap-fitted with the inner side of the stop washer, and the round nut is provided with a slot which is snap-fitted with the outer side of the stop washer.

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