CN201560901U - Wind power speed-up gearbox - Google Patents

Abstract

The utility model provides a wind power generation speed-increasing gear box comprising a gear box body and a power output shaft with one end stretching out of the gear box body, wherein the power output shaft comprises a gear section for transmitting the power; the gear box body is internally fixed with a bearing seat; the power output shaft is sheathed with at least two cylindrical roller bearings and a four-point contact ball bearing, wherein the outer rings of the cylindrical roller bearings are tightly stuck with the bearing seat; and the outer ring of the four-point contact ball bearing is matched with the bearing seat in a gap manner. The main benefits are embodied in the following aspects of: reasonably meeting the use working condition of a high-speed output shaft, having high rotating speed, low load, big axial force and long service life; reasonably meeting the lubrication requirement of an output shaft bearing under the dynamic and static condition; and having easy disassembly and assembly as well as convenient maintenance.

Description

Wind power speed-up gearbox

technical field

The utility model relates to a gear box, in particular to a speed-increasing gear box for wind power generation.

Background technique

As non-renewable energy is facing the dilemma of depletion worldwide, in order to meet the needs of industrial production and human life, people's attention and utilization of renewable energy such as solar energy, wind power, and hydropower have been increasing day by day. Among them, wind power generation is a relatively mature energy development technology with high conversion efficiency, especially in plateaus, coastal areas and other areas.

In wind power generators, the gearbox is a key component. At present, the speed-up gearboxes used in wind power generators in my country are mainly imported. The speed ratio of the wind turbine speed-up gearbox is large, so the high-speed output shaft rotates at a high speed, and the load is relatively small compared with the low-speed stage; and in order to increase the overlap of the gears, the helix angle of the high-speed stage is generally large, which brings a relatively large load. Large axial force; and the gearbox requires a long design life, so reasonable bearing selection and layout are particularly important. At present, the commonly used method is to use double-row tapered roller bearings and cylindrical roller bearings in combination to support the output shaft of the speed-up gearbox. The cylindrical roller bearings of this method are prone to slipping when the load is insufficient. In addition, the current bearing arrangement also has a certain influence on its lubrication and sealing.

Utility model content

The purpose of the utility model is to solve the above-mentioned technical problems, and to provide a speed-up gearbox for wind power generation that can reasonably meet the operating conditions of its high-speed output shaft.

The purpose of this utility model is achieved through the following technical solutions:

A speed-up gearbox for wind power generation, comprising a gear box, one end protruding from the power output shaft of the gear box, the power output shaft includes a gear section for power transmission, and the gear box is provided with There is a bearing seat, the first and second cylindrical roller bearings and a four-point contact ball bearing are set on the power output shaft, and the outer rings of the first and second cylindrical roller bearings are closely attached to the inner wall of the corresponding bearing seat , the outer ring of the four-point contact ball bearing is in clearance fit with the inner wall of the corresponding bearing housing, and the four-point contact ball bearing is located outside the first cylindrical roller bearing at the extension end of the power output shaft.

Further, the cylindrical roller bearings are 2-series cylindrical roller bearings, and the four-point contact ball bearings are 3-series four-point contact ball bearings.

Further, a bearing retaining ring is provided between the first cylindrical roller bearing and the four-point contact ball bearing, and the bearing retaining ring is firmly connected with the bearing seat, and cooperates with the step of the bearing seat to press the first The outer ring of a cylindrical roller bearing.

Further, at least one anti-rotation block is fixed on the outer ring of the bearing retaining ring, and the protruding part of the anti-rotation block extends into the groove of the outer ring of the four-point angular contact ball bearing.

Further, a bearing cover plate is fastened on the outer side of the bearing housing, and the bearing cover plate cooperates with the bearing retaining ring to exert a clamping force on the outer ring of the four-point angular contact ball bearing.

Further, a round nut is threadedly connected to the power output shaft, and the round nut presses a set of oil slinger set on the power output shaft to the inner ring of the four-point angular contact ball bearing, Both the oil throwing ring and the bearing cover plate are provided with sealing grooves.

Further, the outer side of the bearing cover is fastened with a cover and an oil seal provided with an oil return channel, and O-rings are provided on the bearing cover and the bearing seat.

Further, a forced lubricating oil passage is provided in the wind power speed-up gearbox, and the forced lubricating oil passage includes interconnected oil holes arranged on the box body, the bearing seat, and the bearing baffle, and An oil injection port provided on the bearing baffle and in communication with the bearing raceways of the cylindrical roller bearing and the four-point contact ball bearing.

Further, the second cylindrical roller bearing is provided with a special nozzle specially used for spraying lubricating oil and aligned with the bearing raceway of the second cylindrical roller bearing.

Further, the two sides of the cylindrical roller bearing are provided with oil baffles for forming an oil storage pool in the wind power increasing gear box.

The beneficial effects of the utility model are mainly reflected in:

1) Combined use of 2 series cylindrical roller bearings and 3 series four-point angular contact ball bearings reasonably meets the working conditions of high-speed output shafts: high speed, low load, large axial force, and long life;

2) Design a lubricating oil circuit on the bearing retaining ring, spray the lubricating oil directly into the bearing raceway, effectively lubricate the bearing and discharge heat in time;

3) Use forced lubrication and design an oil storage tank for the bearing to reasonably solve the lubrication requirements of the output shaft bearing under dynamic and static conditions;

4) The combined use of contact and non-contact seals effectively solves the dynamic and static seals of high-speed shafts;

5) Make the high-speed output shaft easy to disassemble and maintain.

Description of drawings

Below in conjunction with accompanying drawing, technical scheme of the utility model is further described:

Figure 1: Schematic diagram of the structure of the utility model wind power speed-up gearbox;

Figure 2: Schematic diagram of the structure of the left oil storage tank of the utility model;

Figure 3: Schematic diagram of the fastening of the new utility bearing retaining ring;

Figure 4: Schematic diagram of the forced lubricating oil passage of the utility model.

Detailed ways

The utility model discloses a speed-increasing gear box for wind power generation. The preferred embodiment shown in Figure 1 includes a gear box 7 and a The power take-off shaft 1 of the body 7 is used to transmit power out of the gearbox body 7 shown. The power output shaft 7 includes a gear section 4, which is mated with other gears of the gear box 7 for power transmission. A bearing seat 6 is fixed inside the gear case 7 . ,

The speed ratio of the speed-up gearbox for wind power generation is large, so the speed of the power output shaft 7 is high, and the load is relatively small compared with the low-speed stage; and in order to increase the coincidence degree of the gears, the helix angle of the high-speed stage is generally large, which brings a relatively large load. Large axial force; and the gearbox requires a long design life, so reasonable bearing selection and layout are particularly important.

In the present utility model, at least two cylindrical roller bearings 3, 5 and a four-point contact ball bearing 11 are sleeved on the power output shaft 7. In this embodiment, the two cylindrical roller bearings 3, 5 are respectively located Both sides of the gear segment 4 of the power output shaft 7 . The cylindrical roller bearings are 2-series cylindrical roller bearings, and the 3-series four-point contact ball bearings are used for the four-point contact ball bearings.

This embodiment uses 2-series cylindrical roller bearings and 3-series four-point contact ball bearings, which can not only avoid the slipping phenomenon of 3-series cylindrical roller bearings when the load is insufficient, but also allow the 3-series four-point angular contact ball bearings to Sufficient design life under axial force.

The outer rings of the cylindrical roller bearings 3 and 5 are closely attached to the bearing housings, and the outer rings of the four-point angular contact ball bearings 11 and the bearing housing 6 are in clearance fit in the radial direction, so that all radial forces are The two cylindrical roller bearings 3 and 5 bear the burden, while the four-point angular contact ball bearing 11 only bears the axial force. This combination can give full play to the load-bearing advantages of each bearing. At the same time, the bearing housing 6 is used to combine the cylindrical roller bearings 3 and 5, the four-point angular contact ball bearings 11 and the lubricating seal (detailed later), which avoids the influence of the dislocation of the combined box on the bearing, and facilitates the high-speed output shaft 7 Disassembly and assembly, and such a fixed-floating support method can effectively avoid axial dimension changes caused by temperature differences and avoid jamming.

Further, a bearing retaining ring 8 is provided between the first cylindrical roller bearing 5 and the four-point contact ball bearing 11. As shown in FIG. The bolts 18 are tightly connected, and cooperate with the steps 19 of the bearing seat 6 to press the outer ring of the first cylindrical roller bearing 5 to prevent the rolling balls from slipping. Two symmetrical square grooves are opened on the bearing retaining ring 8, and the two anti-rotation blocks 9 are fixed on the bearing retaining ring 8 with screws 10 in the grooves, and the protruding parts of the two anti-rotation blocks 9 just extend into the In the groove of the outer ring of the above-mentioned four-point angular contact ball bearing 11, the rotation of the outer ring can also be effectively prevented in this way, and the rolling balls can be avoided from slipping.

The outer side of the bearing seat 6 is fastened with a bearing cover plate 13 by bolts, and the bearing cover plate 13 cooperates with the bearing stop ring 8 to clamp the outer ring of the four-point angular contact ball bearing 11. force. A round nut 14 is threadedly connected to the power output shaft 1, and the round nut 14 compresses the oil flinger 12 set on the power output shaft 1 against the four-point angular contact ball bearing 11. The inner ring, the oil throwing ring 12 and the bearing cover plate 13 are all provided with sealing grooves to form a labyrinth seal, which can prevent most of the lubricating oil from leaking. At the same time, a cover plate 15 and an oil seal 16 are installed on the outer end of the output shaft 1, and a corresponding oil return channel is designed. At the same time, O-rings are installed on the bearing cover plate 13 and the bearing seat 6, so as to ensure the dynamic Oil leakage will not occur under static and static conditions.

A forced lubricating oil passage is arranged in the speed-up gearbox of the wind power generation of the present utility model, as shown in Figure 4, the said forced lubricating oil passage includes intercommunicating, is arranged on the box body 7, the bearing seat 6, the bearing block The oil hole on the plate 8, and the oil injection port provided on the bearing baffle plate 8 and communicating with the bearing raceway of the cylindrical roller bearing and the four-point contact ball bearing. The lubricating oil is forced to enter the oil hole a on the bearing seat 6 through the oil hole e of the box, and reach the oil injection ports c and d through the oil hole b on the bearing baffle 8, so that the lubricating oil can be directly sprayed into the bearing raceway, fully Lubricate the bearing and take away the heat of the bearing in time. Another cylindrical roller bearing 3 is equipped with a special nozzle 21, which is aligned with the bearing raceway of the cylindrical roller bearing 3 to ensure sufficient lubrication.

As shown in Figure 1 and Figure 2, the two sides of the cylindrical roller bearings 3, 5 are provided with oil baffles 2, 17, and the gear box 7 is installed at a certain inclination angle, which can form an independent oil storage in the combination Pond 20, can guarantee that each bearing of high-speed output shaft 1 still has lubricating oil supply when lubricating system can't work normally like this.

The utility model uses 2 series of cylindrical roller bearings and 3 series of four-point angular contact ball bearings in combination to reasonably meet the working conditions of the high-speed output shaft: high speed, low load, large axial force, and long life; ring 8, at the same time realize the fixing of the outer rings of bearings 5 and 11, and can integrate the forced lubricating oil circuit into the retaining ring 8, spray lubricating oil directly into the bearing raceway, effectively lubricate the bearing and discharge heat in time; the combination The use of contact and non-contact seals effectively solves the dynamic and static seals of high-speed output shafts.

The utility model also has multiple implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the utility model.

Claims (10)

1. wind power generation speed increasing gear-box, comprise gear housing, one end stretches out in the pto of described gear housing, described pto comprises a gear segment that is used to transmit power, it is characterized in that: described gear housing is provided with bearing support, be set with first on the described pto, second roller bearing and a four-point contact ball, described first, corresponding axis bearing inwall is close in the outer ring of second roller bearing, the outer ring of described four-point contact ball and corresponding axis bearing inwall Spielpassung, described four-point contact ball is positioned at the outside of first roller bearing of pto external part.

2. wind power generation speed increasing gear-box according to claim 1 is characterized in that: described roller bearing selects for use 2 to be roller bearing, and four-point contact ball selects for use 3 to be four-point contact ball.

3. wind power generation speed increasing gear-box according to claim 2, it is characterized in that: be provided with an end ring between described first roller bearing and the four-point contact ball, described end ring and bearing support are fastenedly connected, and cooperate the outer ring that compresses described first roller bearing with the step of bearing support.

4. wind power generation speed increasing gear-box according to claim 3, it is characterized in that: the outer ring of described end ring is fixed with at least one rotation inhibiting block, described rotation inhibiting block projection stretch in the groove of outer ring of described 4 angular contact ball bearings.

5. wind power generation speed increasing gear-box according to claim 4, it is characterized in that: the outside of described bearing support is fastening to be provided with a bearing cover, and described bearing cover cooperates with end ring has all executed a clamping force to the outer ring of described 4 angular contact ball bearings.

6. wind power generation speed increasing gear-box according to claim 5, it is characterized in that: a round nut has been threaded on the described pto, described round nut is sheathed on the inner ring that disc on the described pto is pressed in described 4 angular contact ball bearings with one, is equipped with sealed groove on described disc and the bearing cover.

7. wind power generation speed increasing gear-box according to claim 6 is characterized in that: the fastening oil sealing that is provided with a cover plate and is provided with drainback passage in the outside of described bearing cover is equipped with O type circle on described bearing cover and the bearing support.

8. wind power generation speed increasing gear-box according to claim 7, it is characterized in that: be provided with a pressure lubrication oil duct in the described wind power generation speed increasing gear-box, described pressure lubrication oil duct comprise mutual UNICOM, be arranged at the oilhole on described casing, bearing support, the bearing baffle, and be arranged on the described bearing baffle, with the jet of the bearing race UNICOM of described roller bearing and four-point contact ball.

9. wind power generation speed increasing gear-box according to claim 8 is characterized in that: described second roller bearing be provided be exclusively used in jet lubrication oil and nozzle specially used in alignment with the bearing race of described second roller bearing.

10. it is characterized in that according to Claim 8 or 9 described any one wind power generation speed increasing gear-boxes: the both sides of described roller bearing are provided with and are used to make the oil baffle that forms oil storage pool in the described wind power generation speed increasing gear-box.

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