CN207442561U - A kind of component of motor positioning rotor retaining ring - Google Patents

Abstract

The utility model relates to an assembly of a motor positioning rotor retaining ring, which includes a mandrel and a rotor; the rotor is sleeved on the mandrel, and the outer periphery of the rotor is interference-fitted with a retainer for generating pre-pressure on the mandrel. ring, and the axial length of the retaining ring is equal to that of the rotor; a sealing plate is provided on the side of the mandrel corresponding to the rotor and the retaining ring, corresponding to the rotor and the retaining ring The other side of the rotor is provided with a hydraulic expansion device that provides fluid pressure to hydraulically expand the retaining ring to complete the interference fit between the retaining ring and the rotor. The beneficial effects of the utility model are: instead of the traditional thermal expansion assembly process, some retaining ring materials that cannot be assembled by thermal expansion can be assembled smoothly, and it is avoided that the temperature of each place in the retaining ring is different, or because the materials in various places in the retaining ring The rotor warping phenomenon occurs due to the different thermal expansion characteristics.

Description

A component of motor positioning rotor retaining ring

technical field

The utility model relates to the field of motors, in particular to a component for positioning a rotor retaining ring of a motor.

Background technique

The rotor assembly of the motor needs to have a radial compression preload, which is achieved by installing a retaining ring with an interference fit with the rotor. The preload of the rotor is used to maintain positioning when rotating at high speed. In order to realize the preload of the rotor, the cross-sectional inner diameter of the retaining ring needs to be smaller than the outer diameter of the rotor, and the retaining ring expands to achieve an interference fit with the rotor. The traditional process for retaining ring expansion is to apply heat to cause thermal expansion, which is well suited for many rotating component materials such as fiber-reinforced composites. But it is also limited by the maximum acceptable temperature and thermal expansion rate of some materials, therefore, some materials cannot be assembled with thermal expansion. The second problem encountered in using thermal expansion fits is non-uniform expansion, if the retaining ring expands in a different way because the temperature is different everywhere in the retaining ring, or because the thermal expansion characteristics of the materials in the retaining ring are not the same. Uniformly, rotor warpage occurs.

Utility model content

To sum up, in order to overcome the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a motor positioning rotor retaining ring assembly.

The technical solution of the utility model to solve the above-mentioned technical problems is as follows: a motor positioning rotor retaining ring assembly, including a mandrel and a rotor; A retaining ring that generates pre-pressure on the mandrel, and the axial length of the retaining ring is equal to that of the rotor; a sealing plate is provided on the side of the mandrel corresponding to the rotor and the retaining ring, on which the corresponding The other side of the rotor and the retaining ring is provided with a hydraulic expansion device that provides fluid pressure to hydraulically expand the retaining ring to complete interference fit between the retaining ring and the rotor.

The beneficial effects of the utility model are: instead of the traditional thermal expansion assembly process, some retaining ring materials that cannot be assembled by thermal expansion can be assembled smoothly, and avoid different temperatures in various places in the retaining ring, or because the materials in various places in the retaining ring The rotor warping phenomenon occurs due to the different thermal expansion characteristics.

On the basis of the above technical solution, the utility model can also be improved as follows:

Further, a bushing is also included; the bushing is located on the outer periphery of the rotor and corresponds to between the rotor and the retaining ring, and the axial length of the bushing is equal to that of the retaining ring and the rotor, the The bushing expands synchronously with the retaining ring.

Further, there is a space between the retaining ring and the bush for expansion of both.

The beneficial effect of adopting the above-mentioned further solution is that the retaining ring and the bushing can be expanded smoothly.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the accompanying drawings, the list of parts represented by each label is as follows:

1. Mandrel, 2. Rotor, 3. Retaining ring, 4. Sealing plate, 5. Hydraulic expansion device, 6. Bushing, 7. Clearance.

Detailed ways

The principles and features of the present utility model are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the utility model, and are not used to limit the scope of the utility model.

As shown in Figure 1, a motor positioning rotor retaining ring assembly, including a mandrel 1 and a rotor 2; The mandrel 1 generates a retaining ring 3 of pre-pressure, and the axial length of the retaining ring 3 is equal to that of the rotor 2; the side of the mandrel 1 corresponding to the rotor 2 and the retaining ring 3 has The other side of the sealing plate 4 corresponding to the rotor 2 and the retaining ring 3 is provided with a hydraulic expansion device 5 that provides fluid pressure to hydraulically expand the retaining ring 3 so that the retaining ring 3 and the rotor 2 complete an interference fit. The assembly also includes a bushing 6, the bushing 6 is located on the outer periphery of the rotor 2 and between the corresponding rotor 2 and the retaining ring 3, and the bushing 6 is connected to the retaining ring 3 and the rotor 2 The axial lengths are equal. The bushing 6 expands synchronously with the retaining ring 3 , and there is a gap 7 between the retaining ring 3 and the bushing 6 for both expansion.

When assembling, put the rotor 2 onto the mandrel 1, install the retaining ring 3 and the bushing 6 to the corresponding positions, and then start the hydraulic expansion device 5 to provide fluid pressure to hydraulically expand the retaining ring 3 and the bushing 6, Until the interference fit between the retaining ring 3 and the bush 6 and the rotor 2 is completed.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (3)

1. An assembly of a motor positioning rotor retaining ring, characterized in that it comprises a mandrel (1) and a rotor (2); the rotor (2) is sleeved on the mandrel (1), and the rotor (2) ) is provided with a retaining ring (3) that makes it produce a preload on the mandrel (1) in an interference fit on the periphery; on the mandrel (1) there is a retaining ring (3) corresponding to the rotor (2) and the retaining ring (3) One side is provided with a sealing plate (4), and the other side corresponding to the rotor (2) and the retaining ring (3) is provided with fluid pressure to hydraulically expand the retaining ring (3) so that the retaining ring (3) and the retaining ring (3) The rotor (2) completes the hydraulic expansion device (5) with an interference fit. 2. The motor positioning rotor retaining ring assembly according to claim 1, characterized in that it also includes a bushing (6); the bushing (6) is located on the outer periphery of the rotor (2) and corresponds to the rotor (2) ) and the retaining ring (3), and the bushing (6) expands synchronously with the retaining ring (3). 3. The motor positioning rotor retaining ring assembly according to claim 2, characterized in that there is a gap (7) between the retaining ring (3) and the bush (6) for expansion of both.