CN107199449A - Main reducing gear rotor shaft lower pulling force bearing assembling device - Google Patents

Abstract

The invention relates to an assembly device for the pull-down force bearing of the rotor shaft of the main reducer, which includes a pull rod, a baffle, a pressure sleeve, a hydraulic cylinder, a support plate, a nut, a gasket, and a centering sleeve. The pull rod is sequentially installed with a baffle, Centering sleeve, pressure sleeve, hydraulic actuator, support disc, nut, among which the baffle plate and centering sleeve are matched with the spigots at both ends of the rotor shaft; the end face of the pressure sleeve is in contact with the end face of the inner ring of the bearing, and the oil cylinder of the hydraulic actuator One end is in contact with the pressure sleeve, and the other end is in contact with the support plate, and the support plate is limited by the nut and the gasket installed at the end of the tie rod. The invention realizes that the rotor shaft can assemble the pull-down force bearing to the specified position under the state of unlimited position in the axial direction, avoids damage to the bearing due to improper installation of the bearing and knocking, ensures the safety of use, and reduces the The cost loss caused by unnecessary rework or replacement of new products shortens the production cycle.

Description

Final drive rotor shaft pull-down force bearing assembly device

technical field

The invention relates to a bearing assembly device, in particular to a main reducer rotor shaft pulling force bearing assembly device, which realizes accurate and efficient assembly of the helicopter main reducer rotor shaft in the state of assembling the pulling force bearing in the state of unlimited axial position.

Background technique

Bearings are widely used rotating components in mechanical transmission. The helicopter main reducer rotor shaft pull-down bearing is installed between the rotor shaft and the bearing bush on the casing. During assembly, one end of the rotor shaft is usually fixed, and the other end is assembled to the rotor shaft by applying force on the bearing. Due to the axial limitless structure of the rotor shaft of the main reducer, when the pull-down force bearing is assembled on the rotor shaft, the axial direction of the rotor shaft can be moved in series. The position of the fixing device at the fixed end of the rotor shaft is very critical. , if the size of the fixed position is not suitable, it will cause the failure of the bearing assembly not in place, which will affect the overall technical indicators of the helicopter and even the flight safety. In addition, due to the limited length of the rotor shaft, when assembling the pull-down force bearing, it cannot be placed on the press, and the bearing can only be assembled to the rotor shaft by knocking the bearing. This impact can easily cause fatigue or damage to the bearing. , Abnormal phenomena such as bearing wear and large vibration are prone to occur during work. Repairing or replacing new products will increase the cost and prolong the production cycle, resulting in unnecessary waste of resources.

Contents of the invention

The purpose of the present invention is to provide an assembly device for the pull-down force bearing of the rotor shaft of the main reducer, which ensures that the pull-down force bearing is assembled to the specified position when the rotor shaft of the main reducer is in the axially unlimited position, ensures safe use, and avoids parts Repair or replacement, saving resources and shortening the production cycle.

The technical solution of the present invention is that the final drive rotor shaft pull-down force bearing assembly device includes a pull rod, a baffle plate, a pressure sleeve, a hydraulic actuator, a support plate, a nut, a gasket, and a centering sleeve, and the length of the pull rod is longer than that of the rotor shaft. The length is more than 500mm, and baffles, centering sleeves, pressure sleeves, hydraulic cylinders, support plates, and nuts are installed in sequence, among which the tie rods are fixed with the baffles, and the baffles are disc-shaped, and the spigot of the bearing end is not assembled with the rotor shaft Coordination; the centering sleeve is in the shape of a disc, and fits with the spigot of the bearing end of the rotor shaft assembly; the pressure sleeve is a cylindrical structure, the inner diameter is larger than the outer diameter of the rotor shaft, and the outer diameter is smaller than the bearing cage, and the end surface is in contact with the end surface of the inner ring of the bearing 1. One end of the oil cylinder of the hydraulic actuator is in contact with the pressure sleeve, and the other end is in contact with the support plate, and the support plate is limited by the nut and the gasket installed at the end of the pull rod.

In the present invention, the baffle plate and the pull rod are fixed on the rotor shaft, and the other end of the pull rod is sequentially installed with a pressure sleeve, a hydraulic actuator, and a support plate, and is firmly fixed with a washer and a nut. The cylinder elongates and pushes the pressure sleeve to move in the direction of pressing the tension bearing downwards to complete the pressure installation of the bearing. The invention realizes that the rotor shaft can assemble the tension bearing to the specified position under the state of unlimited axial position, avoiding the The damage to the bearing due to improper installation of the bearing and knocking ensures the safety of use, reduces the cost loss caused by unnecessary repair or replacement of new products, and shortens the production cycle.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

detailed description

As shown in the figure, a main reducer rotor shaft pulling force bearing assembly device includes a pull rod 1, a baffle plate 2, a pressure sleeve 3, a hydraulic cylinder 4, a support plate 5, a nut 6, a gasket 7, and a centering sleeve 8 , the length of the tie rod 1 is more than 500mm longer than the rotor shaft, and the baffle plate 2, the centering sleeve 8, the pressure sleeve 3, the hydraulic actuator 4, the support plate 5, and the nut 6 are installed in sequence, wherein the tie rod 1 and the baffle plate 2 are fixed, The baffle plate 2 is in the shape of a disk and fits with the notch of the rotor shaft without bearing end; the centering sleeve 8 is in the shape of a disc and fits with the notch of the rotor shaft with the bearing end; The outer diameter is clearance fit, the outer diameter is smaller than the bearing cage, the end face is in contact with the inner ring end face of the bearing, one end of the oil cylinder of the hydraulic actuator 4 is in contact with the pressure sleeve 3, and the other end is in contact with the support disc 5, and the support disc 5 is installed on the end of the pull rod 1 The nut 6 and the washer 7 of the part are limited.

When the present invention is in use, the baffle plate 2 is first installed on the pull rod 1, and then the pull rod 1 is penetrated through the center hole at the end of the rotor shaft not equipped with a bearing, so that the shoulder of the baffle plate 2 is matched with the notch of the rotor shaft, Install the heated pull-down bearing on the journal of the rotor shaft, install the centering sleeve 8 on the pull rod 1 and match it with the notch of the rotor shaft, press the press-fitting surface of the pressure sleeve 3 onto the inner ring of the bearing, Then install the hydraulic actuator 4 on the pull rod, install the support disc 5 on the pull rod 1 and fix it on the hydraulic actuator 4, then fix it with the nut 6 and the gasket 7, and then use the handle of the hydraulic actuator 4 to The hydraulic actuator 4 exerts force and makes the oil cylinder of the hydraulic actuator 4 elongate. At this time, the hydraulic actuator 4 exerts a leftward force on the right end surface of the rotor shaft through the pull rod 1, and the pull-down force bearing through the pressure sleeve 3 Apply a force to the right, and under the action of two opposing forces in opposite directions, the pressing sleeve 3 moves along the direction in which the centering sleeve 8 presses the lower tension bearing and presses the lower tension bearing onto the rotor shaft, and until pressed against.

Claims (1)

1. A main reducer rotor shaft pull-down force bearing assembly device, characterized in that the assembly device includes a pull rod (1), a baffle plate (2), a pressure sleeve (3), a hydraulic cylinder (4), The support plate (5), nut (6), gasket (7), centering sleeve (8), the length of the pull rod (1) is more than 500mm longer than the rotor shaft, and the baffle plate (2), centering sleeve ( 8), pressure sleeve (3), hydraulic cylinder (4), support plate (5), nut (6), wherein the tie rod (1) is fixed to the baffle (2), and the baffle (2) is disc-shaped , fits with the spigot of the unassembled bearing end of the rotor shaft; the centering sleeve (8) is disc-shaped, and fits with the spigot of the assembled bearing end of the rotor shaft; Fitting, the outer diameter is smaller than the bearing cage, the end face is in contact with the inner ring end face of the bearing, one end of the oil cylinder of the hydraulic cylinder (4) is in contact with the pressure sleeve (3), and the other end is in contact with the support plate (5), and the support plate (5) passes through The nut (6) and the spacer (7) that are installed on the end of the pull rod (1) are limited.