CN103335012A - Sun gear shaft of wind power gear box - Google Patents

Abstract

The invention discloses a sun gear shaft of a wind power gearbox, which is a shaft gear with an inner hole (14) composed of three sections: a sun gear (11), a support shaft (12) and an output shaft (13). The support shaft (12) is provided with a spiral groove (15). The spiral groove (15) is more than one circle along the circumference of the support shaft (12), and the spiral groove (15) is equivalent to adding a spring with moderate stiffness between the sun gear (11) and the output shaft (13), which can realize the The axial floating of (11) can realize the radial floating of the sun gear (11) again. The invention has the following advantages: the impact and vibration of the planetary gear transmission mechanism on the structure of the next stage are reduced, the performance of the planetary gear transmission mechanism is improved, and the stable transmission of the high-speed output stage is guaranteed.

Description

A sun gear shaft of a wind power gearbox

technical field

The invention relates to a planetary gear transmission mechanism in a wind power gearbox, in particular to a sun gear shaft of a wind power gearbox.

Background technique

The wind power gearbox uses a planetary gear transmission mechanism. The planetary gear mechanism is connected to the blades outside the wind power gearbox. The blades are driven by the wind to rotate the first-stage planetary gears, and the first-stage planetary gears drive the first The first-stage sun gear rotates, the first-stage sun gear is connected to the sun gear shaft, and the first-stage sun gear shaft transmits wind power to the next-stage planetary gear, and then to the generator, which generates electrical energy.

Fig. 1 is a diagram of a planetary gear transmission mechanism of an existing wind power gearbox, which includes a two-stage planetary gear train and a fixed-axis gear train. The first-stage planetary gear train has the first sun gear shaft 1, the first planetary carrier 2, the first planetary gear 3 and the first ring gear 4. The first planetary carrier 2 is connected to the main shaft of the blade and driven by the main shaft of the blade to drive The first sun gear shaft 1 rotates; the second-stage planetary gear train has a second sun gear shaft 5, a second planetary carrier 6, a second planetary gear 7 and a second ring gear 8, and the second planetary carrier 6 and the first sun gear Shaft 1 is coaxially linked to drive the second sun gear shaft 5 to rotate; the fixed shaft gear system has a large gear 10 and a high speed gear 9, and the large gear 10 is coaxially linked with the second sun gear shaft 5 to drive the high speed gear 9 to rotate, and the high speed gear Shaft 9 is the output shaft, which drives the generator rotor to rotate.

Since the first-stage planetary transmission transmits wind-varying loads, its input torque and speed have strong time-varying and large fluctuations, so it is necessary to take corresponding measures as much as possible to improve the stability of planetary transmission operation, and the AGMA 6123 published by the American Gear Manufacturers Association The -B06 standard has listed 19 measures to improve the load sharing of planetary gear transmissions, including a solution that allows one or more components to float radially, that is, the elastic deformation of the ring gear or the sun gear or both.

Chinese patent document CN102518787A discloses a planetary transmission structure of a wind power gearbox, which includes a sun gear, a planetary gear, a planetary gear bearing, a mandrel and a planetary gear bracket, the mandrel is installed on the planetary gear bracket, and the planetary gear is installed through the planetary gear bearing On the mandrel, the planetary wheel bearings are a pair of tapered roller bearings installed back-to-back. There is an interlayer between the two tapered roller bearings. The outer side of a pair of tapered roller bearings is close to the steps of the mandrel, and the other side is close to Lean on the washer arranged on the planetary gear bracket. This patent solves the impact of axial wind force on the planetary gear, but when the sun gear and the planetary gear are in helical mesh, the axial wind force will be transmitted to the sun gear through the planetary gear, and will affect the sun gear and the next stage connected to the sun gear The structure causes impact, and in addition, this patent cannot deal with the vibration problem caused by radial force to the planetary gear transmission.

Contents of the invention

The technical problem to be solved by the present invention is to provide a sun gear shaft of a wind power gearbox that can reduce the impact and vibration of the planetary gear transmission mechanism on the next-level structure.

To solve the above-mentioned technical problems, the present invention is a shaft gear with an inner hole which is composed of three sections of a sun gear, a support shaft and an output shaft, and a spiral groove is provided on the support shaft.

The above-mentioned spiral groove is more than one circle along the circumferential direction of the support shaft, so that the planetary gear transmission mechanism can obtain better load balancing performance. A helical groove longer than one turn is equivalent to adding a spring with moderate stiffness between the sun gear and the output shaft, so that both the axial float of the sun gear and the radial float of the sun gear can be realized.

Principle of the present invention is:

In the wind power gearbox, under the condition that the planetary gear support is the input stage, since the sun gear and the planetary gear are both helical gears with a certain helix angle, the sun gear must be subjected to a certain positive or reverse axial force. The time-varying axial force has a certain impact on the high-speed output end, so reducing the axial force of the sun gear is conducive to improving the performance of the planetary gear transmission mechanism and ensuring the smooth transmission of the high-speed output stage.

When the sun gear is subjected to an axial force, since there is a spiral groove around the shaft in the middle of the support shaft, the rigidity of the spiral groove is relatively small, so the spiral groove has a certain compression or tensile deformation, so that the support shaft of the sun gear The axis gets a certain amount of float. When the transmission load of the planetary gear is within the design range, because the helical groove of the support shaft has moderate rigidity, there is only a slight deformation of the helical groove, so the sun gear and the planetary gear can mesh normally.

When the sun gear is subjected to a large radial impact load, since the radial stiffness of the spiral groove on the support shaft is smaller than the axial stiffness, the spiral groove has a certain bending elastic deformation, so that the sun gear obtains a certain radial displacement. In this way, the influence of radial impact load on the remaining meshing gear pairs is reduced, and the effect of radial impact is reduced. When the radial impact effect disappears, the spiral groove with elastic deformation returns to the original position, thereby maintaining the normal operation of each tooth pair. engage.

Due to the adoption of the above technical solution, the present invention has the following advantages: the impact and vibration of the planetary gear transmission mechanism on the next-stage structure is reduced, the performance of the planetary gear transmission mechanism is improved, and the high-speed output stage is guaranteed to drive smoothly.

Description of drawings

The accompanying drawings of the present invention are as follows:

Fig. 1 is a schematic diagram of a planetary gear transmission mechanism of an existing wind power gearbox;

Fig. 2 is a structural representation of the present invention;

Fig. 3 is the schematic diagram of the three-dimensional structure of place A in Fig. 1;

Fig. 4 is a schematic diagram of a planetary gear transmission mechanism using the present invention.

In the figure: 1. The first sun gear shaft; 2. The first planet carrier; 3. The first planetary gear; 4. The first ring gear; 5. The second sun gear shaft; 6. The second planet carrier; 7. The second Two planetary gears; 8. Second ring gear; 9. High speed gear; 10. Big gear;

11. Sun gear; 12. Support shaft; 13. Output shaft; 14. Inner hole; 15. Spiral groove; 1′. The sun gear shaft of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

As shown in Fig. 2 and Fig. 3, the present invention is a shaft gear with inner hole 14 which is composed of sun gear 11, support shaft 12 and output shaft 13, and helical groove 15 is provided on support shaft 12.

As shown in FIG. 2 , the above-mentioned spiral groove 15 is longer than one turn along the circumferential direction of the support shaft 12 .

As shown in FIG. 3 , the spiral groove 15 has a groove width and a pitch. When the sun gear 11 bears a large impact load, the groove width is larger and the pitch is smaller. According to the actual situation, the spiral groove 15 can be set as two or more than two.

The spiral groove 15 is a groove on the surface of the support shaft 12. At this time, the spiral groove does not pass through the inner hole 14, which is suitable for the case where the sun gear shaft transmits a large torque and the sun gear has no axial floating. The spiral groove 15 passes through the inner hole 14, which is suitable for the situation that the sun gear has both axial floating and radial floating.

Compared with the planetary gear transmission mechanism of the existing wind power gearbox, the present invention also has the following advantages:

1. Under the same elastic deformation condition, the length of the sun gear shaft is reduced, which can reduce the axial dimension of the wind power gearbox;

2. Since there is an inner hole 14 in the center of the shaft, the stiffness of the "spring" of the sun gear shaft can be changed when changing the inner diameter or outer diameter of the support shaft 12;

3. Changing the groove width of the pitch of the spiral groove 15 can make the sun gear 11 obtain larger radial displacement and axial displacement;

4. The structure is relatively simple, easy to process and manufacture, and can reduce production costs.

As shown in Figure 4, the sun gear shaft 1' of the present invention is used as the first-stage sun gear shaft, which increases the flexibility of the first-stage planetary transmission system, facilitates the uniform distribution of the gear tooth load in the tooth width direction, and reduces the The influence of wind-variable impact load on the planetary gear transmission mechanism of the wind power gearbox enhances the load-bearing performance of the planetary gear transmission mechanism and improves the stability and reliability of the planetary gear transmission mechanism.

Claims (4)

1. the central gear shaft of a wind-powered electricity generation gear-box is characterized in that: by sun gear (11), back shaft (12) and (13) three sections axle type gears that constitute the band endoporus (14) of one of output shaft, be provided with spiral chute (15) at back shaft (12).

2. the central gear shaft of wind-powered electricity generation gear-box according to claim 1 is characterized in that: described spiral chute (15) along back shaft (12) circumferentially greater than a week.

3. the central gear shaft of wind-powered electricity generation gear-box according to claim 1 and 2 is characterized in that: described spiral chute (15) is the groove on back shaft (12) surface.

4. the central gear shaft of wind-powered electricity generation gear-box according to claim 1 and 2 is characterized in that: described spiral chute (15) break-through endoporus (14).

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