CN204419878U - The spindle support structure of Large-scale Wind Turbines - Google Patents

Abstract

The utility model discloses a kind of spindle support structure of Large-scale Wind Turbines, comprise main shaft, bearing, bearing support, described bearing adopts two single-row tapered roller bearings; Described bearing support is integral bearing seat, there are two bearing installation positions, one is the upwind installation position of corresponding wind wheel end, another is the lower wind direction installation position of corresponding teeth roller box or generator, in two these two installation positions of single-row tapered roller bearing apportion, and back-to-back layout, on the leeward in bearing cap, be provided with bearing pre-tightened mechanism, can apply axial pre tightening force to bearing, upwind is pointed to by lower wind direction in the direction of pretightening force.When mounted can the very large axial pre tightening force of pre-add, and then improve rigidity and the bearing capacity of axis system.

Description

Main shaft support structure of large wind turbine

technical field

The utility model belongs to the field of wind power generating equipment, in particular to a main shaft support structure of a large wind power generating set.

Background technique

The main shaft of the wind turbine is supported by a pair of roller bearings. The two bearings are installed on the split bearing housing. One end of the main shaft is connected to the wind wheel, and the other end is connected to the gearbox or generator. Both ends are cantilever structures. With the continuous increase of the power of a single wind turbine unit, the load on the main shaft is increasing. If this conventional structure is still used, not only large-size roller bearings must be selected, but also the span of the two bearings must be increased. Correspondingly, The geometry of the housing must also be enlarged, the problem is:

1. As the span of the two bearings increases, the structural rigidity of the main shaft system deteriorates, and its excitation effect cannot meet the requirements of the design specifications, and the operating reliability is reduced;

2. The size of the bearing seat is large, and the machine compartment must also be enlarged proportionally, resulting in high manufacturing cost and poor economy.

Contents of the invention

The purpose of the utility model is to solve the above-mentioned technical problems and provide a main shaft support structure of a large-scale wind power generating set. Its technical solution is:

A main shaft support structure of a large-scale wind power generating set, including a main shaft, a bearing, and a bearing housing. The bearing adopts two single-row tapered roller bearings; The installation position corresponding to the upwind direction of the wind wheel end, and the other is the installation position corresponding to the downwind direction of the gearbox or generator. Two single-row tapered roller bearings are arranged in the two installation positions, arranged back to back, that is, two bearing tapered roller bearings The direction of the taper is opposite, and the tips of the cones face each other; on the leeward end face of the bearing housing, a bearing preloading mechanism can be provided to apply an axial preloading force to the bearing, and the direction of the preloading force is from the downwind direction to the upwind direction.

The bearing pre-tightening mechanism is composed of an oil seal ring, a pressure ring, a screw and a lock nut. The front end face of the oil seal ring bears against the end face of the inner ring of the bearing, and the rear end face is supported by the pressure ring, and the pressure ring is connected to the On the lock nut, the lock nut is fixed on the main shaft, and the axial thrust is applied by turning the screw, which is transmitted to the inner ring of the bearing through the oil seal ring, so that the bearing can be pre-tightened.

A seal ring is provided on the axial sliding mating surface of the oil seal ring and the bearing cover, which can avoid leakage of lubricating oil.

The beneficial effects of the utility model are:

This type of main shaft support structure, due to the use of tapered roller bearings, can pre-load a large axial preload during installation, improve the bearing capacity, and meet the design requirements; it can reduce the span of the two bearings and increase the rigidity of the main shaft system. Reduce the excitation and improve the safety of the unit operation; reduce the geometric size of the bearing seat and the engine room, and reduce the manufacturing cost.

Description of drawings

Figure 1 is a structural diagram of the main shaft support of the wind power generating set.

Symbols in the figure: 1—upwind direction bearing, 2—downwind direction bearing, 3—main shaft, 4—pressure ring, 5—oil seal ring, 6—screw, 7—bearing cover sealing ring, 8—integrated bearing housing, 9— fasten the screw nut.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1: the main shaft support structure of this large-scale wind power generating set includes a main shaft 3, an upwind bearing 1, a downwind bearing 2, and a bearing seat 8. The main shaft 3 is a three-step stepped shaft with a large diameter section, A medium diameter section and a small diameter section, the large diameter section is used to connect the wind rotor, the small diameter section is used to connect the gearbox or generator, the medium diameter section is supported by bearings; the bearings 1 and 2 use two single row tapered rollers sub-bearing; the bearing seat 8 is an integrated bearing seat with two bearing installation positions, one is the installation position corresponding to the upwind direction of the wind wheel end, and the other is the installation position corresponding to the downwind direction of the gearbox, two single-row tapered rollers Bearings 1 and 2 are arranged in the two installation positions, arranged back to back, that is, the taper directions of the two bearing tapered rollers are opposite, and the cone tips face each other; on the downwind end surface of the bearing housing, a bearing preloading mechanism is provided, which can The bearing exerts an axial preload, and the direction of the preload is from the downwind direction to the upwind direction.

The bearing pre-tightening mechanism is composed of an oil seal ring 5, a pressure ring 4, a screw 6, and a lock nut 9. The front end face of the oil seal ring 5 withstands the end face of the inner ring of the bearing 2, and its rear end face is supported by the pressure ring 4 , the pressure ring 4 is connected to the lock nut 9 through the screw 6, and the lock nut 9 is fixed on the main shaft 3, and the axial thrust is applied by turning the screw 6, which is transmitted to the inner ring of the bearing through the oil seal ring 5, and the bearing can be pre-loaded. tight.

The axial sliding surface of the oil seal ring 5 is provided with a seal ring 7 to avoid leakage of lubricating oil.

Claims (3)

1. A main shaft support structure of a large-scale wind power generating set, comprising a main shaft, a bearing, and a bearing housing, characterized in that: the bearing adopts two single-row tapered roller bearings; the bearing housing is an integral bearing housing with two Bearing installation positions, one is the upwind installation position corresponding to the wind rotor end, and the other is the downwind installation position corresponding to the gearbox or generator. Two single-row tapered roller bearings are arranged in the two installation positions, arranged back to back, that is The taper directions of the two bearing tapered rollers are opposite, and the cone tips face each other; on the downwind end surface of the bearing housing, a bearing preloading mechanism is provided to apply axial preloading force to the bearing, and the direction of the preloading force is directed from the downwind direction Upwind. 2. The main shaft support structure of a large wind power generating set according to claim 1, characterized in that: the bearing pretension mechanism is composed of an oil seal ring, a pressure ring, a screw, and a lock nut, and the front end of the oil seal ring The end face of the inner ring of the bearing is held, and the rear end face is supported by the pressure ring. The pressure ring is connected to the lock nut by screws, and the lock nut is fixed on the main shaft. The axial thrust is applied by turning the screw and transmitted to the bearing through the oil seal ring. The inner ring preloads the bearing. 3. The main shaft support structure of a large wind power generating set according to claim 2, wherein a sealing ring is provided on the axial sliding mating surface of the oil seal ring and the bearing cover to avoid leakage of lubricating oil.