CN212300886U

CN212300886U - Connecting device for motor test and motor test device

Info

Publication number: CN212300886U
Application number: CN202022198826.7U
Authority: CN
Inventors: 司翔
Original assignee: ZF Friedrichshafen AG
Current assignee: ZF Friedrichshafen AG
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-01-05
Anticipated expiration: 2030-09-29

Abstract

The utility model provides a connecting device and motor testing arrangement for motor test is surveyed the motor and is arranged in the incubator, connecting device passes the lateral wall of incubator, connecting device includes casing, connecting axle and two at least bearings, the connecting axle includes first section and second section, first section stretches out the casing is in the incubator with the connection outside the measured motor, the outer motor test equipment of incubator is connected to the second section, two at least bearing housing are located on the second section, in order to support the connecting axle, the outer lane of each bearing with the inner wall tight fit of casing, the inner circle of each bearing with the connecting axle synchronous revolution, connecting device is in when passing the lateral wall of incubator the casing with form sealedly between the lateral wall. The utility model discloses can realize being surveyed the motor and guarantee the accuracy of test result under the invariable condition of ambient temperature.

Description

Connecting device for motor test and motor test device

Technical Field

The utility model relates to a connecting device and motor testing arrangement for motor test.

Background

In the field of motor testing, the performance of a motor in different temperature ranges needs to be tested. For small motors, it is particularly difficult to test their performance when torque output is low over different temperature ranges.

In the prior art, a motor to be measured is usually placed in an incubator, the motor is kept at a set environmental temperature, and then the motor is taken out, and the performance of the motor is measured to be used as the performance of the motor at the set environmental temperature. Since it is difficult to maintain the set ambient temperature in the oven at room temperature for the taken-out motor, the accuracy of the test result cannot be achieved.

If the tested motor in the incubator is not taken out in order to simulate the environmental temperature of the motor in real time, the output shaft cannot be directly connected with the motor testing equipment outside the incubator due to the length limitation of the output shaft of the motor. If the output shaft is designed to be very long, the output shaft of the motor is easy to shake at the tip, and the accuracy of a test result is affected. In addition, if the output shaft directly penetrates through the side wall of the incubator, the output shaft is in contact with the side wall of the incubator, so that friction loss is caused, and the accuracy of the test result is also influenced.

Therefore, the structure for testing the motor in the prior art cannot obtain an accurate test result of the performance of the motor under a certain constant environment temperature.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a new connecting device and motor testing arrangement for motor test in order to overcome the device of test motor among the prior art and can't realize the defect of guaranteeing motor performance test result accuracy when ambient temperature is invariable.

The utility model discloses a solve above-mentioned technical problem through following technical scheme:

a connecting device for motor testing is characterized in that a tested motor is arranged in an incubator, the connecting device penetrates through the side wall of the incubator, and the connecting device comprises a shell, a connecting shaft and at least two bearings.

The connecting shaft comprises a first section of the connecting shaft and a second section of the connecting shaft, the first section of the connecting shaft extends out of the shell to be connected with the tested motor in the incubator, and the second section of the connecting shaft is connected with the motor test equipment outside the incubator.

The at least two bearings are sleeved on the second section of the connecting shaft to support the connecting shaft, the outer ring of each bearing is tightly matched with the inner wall of the shell, and the inner ring of each bearing and the connecting shaft rotate synchronously.

The connection means forms a seal between the housing and the side wall of the incubator when the connection means passes through the side wall.

Preferably, the bearing is a ceramic bearing.

Preferably, the connecting shaft is sleeved with a plurality of thrust rings, and the thrust rings are used for limiting the axial movement of the inner ring of the ceramic bearing.

Preferably, the bearing is an air bearing.

Preferably, the housing comprises a first end cover and a housing main body fixedly connected with the first end cover, the first end cover is located in the incubator, and a first section of the connecting shaft extends out of the first end cover.

Preferably, a through hole of the first end cover for the first section of the connecting shaft to extend out is internally provided with lubricating grease.

Preferably, the connecting device further comprises a thermostatic structure including a fluid inflow passage and a fluid outflow passage provided in the housing main body, and a bushing provided outside an outer ring of the bearing, the bearing being located within a space covered by a thickness of a side wall of the incubator, the fluid inflow passage communicating with one end of the bushing, and the other end of the bushing communicating with the fluid outflow passage.

Preferably, the bushing is tightly fitted with the housing, and an outer surface of the bushing is provided with a channel for fluid to flow.

Preferably, the channel is helical.

A motor testing device comprises an incubator, a torque sensor, a servo motor and the connecting device.

The tested motor is arranged in the incubator, and an output shaft of the tested motor is connected with a first section of a connecting shaft of the connecting device.

The side wall of the incubator is provided with a through hole, and the shell of the connecting device penetrates through the through hole and is sealed with the inner wall of the through hole.

The second section of the connecting shaft is connected with the torque sensor, and the torque sensor is connected with the servo motor.

Preferably, the inner wall of the through hole is provided with a rubber sleeve, and the shell is sealed with the inner wall of the through hole through the rubber sleeve.

The utility model discloses the technological effect who obtains is: the tested motor in the incubator is connected with external motor testing equipment through the connecting device, so that the performance of the tested motor at different environmental temperatures can be measured in real time under the condition that the tested motor is at a plurality of constant environmental temperature values; the shell of the connecting device is sealed with the wall of the incubator, so that the constant temperature value in the incubator can be maintained; and the direct contact between the connecting shaft and the wall of the incubator can be avoided by means of the shell, so that the friction loss caused when the power of the output shaft of the tested motor is transmitted to the connecting shaft is reduced, and the accuracy of a test result is improved.

Drawings

Fig. 1 is a simplified schematic structural diagram of a motor testing device according to embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of a connection device according to embodiment 1 of the present invention.

Fig. 3 is a schematic structural view of a connection device according to embodiment 2 of the present invention.

Reference numerals:

a temperature box 1, a connecting device 2, a torque sensor 3, a servo motor 4, a tested motor 5 and a coupling 6,

the side wall 11, the through hole 12, the rubber sleeve 13,

a housing 21, a connecting shaft 22, a bearing 23, an outer race 231, an inner race 232, rolling bodies 233, a thrust ring 224, a bush 25,

the first end cap 21a, the housing body 21b,

a fluid inflow passage 213 and a fluid outflow passage 214,

the first section 221, the second section 222,

the air bearing 24, the inner race 241, the outer race 242, the seal 243,

the channel 251.

Detailed Description

The following description will be made for a better understanding of the present invention with reference to the accompanying drawings.

Example 1

The embodiment provides a motor testing device, which is suitable for testing various types of motors, including large motors and small motors, and is particularly suitable for testing the performance of the motors with torque less than 0.1 Nm. The testing device can test the torque, the rotating speed, the current, the internal resistance and other parameters of the motor.

As shown in fig. 1, the testing device comprises an incubator 1, a connecting device 2, a torque sensor 3 and a servo motor 4.

The motor 5 to be tested is arranged in the incubator 1, and the incubator can provide a wider adjustable environment temperature range for the motor to be tested, such as-40 ℃ to 150 ℃ and the like. A through hole 12 is formed in the side wall 11 of the incubator 1, the motor 5 to be measured penetrates through the through hole 12 by means of the connecting device 2 to be connected with the torque sensor 3 outside the incubator 1, and the torque sensor 3 is connected with the servo motor 4. Optionally, the testing device further comprises one or more couplings 6, and the tested motor 5, the connecting device 2, the torque sensor 3 and the servo motor 4 are connected in pairs through the couplings 6 respectively.

Fig. 2 shows in particular the connecting device 2, which comprises a housing 21, a connecting shaft 22 and at least two bearings 23.

The connection means 2, when passing through the side wall 11 of the incubator, form a seal between the housing 21 and the side wall 11. Specifically, the inner wall of the through hole 12 is provided with a rubber sleeve 13, and the shell 21 is sealed with the inner wall of the through hole through the rubber sleeve 13.

The rubber sleeve 13 is provided to be able to adaptively match the connection gap between the housing 21 and the through hole 12. By only adjusting the size of the rubber sleeve 13, shells with different sizes can pass through the through hole 12, and good sealing can be formed without changing the size of the shell 21, so that the test is more convenient.

The housing 21 is constructed in a two-stage structure to facilitate installation. Specifically, the housing 21 includes a first end cap 21a and a housing main body 21b fixedly connected to the first end cap, and the first end cap 21a is disposed in the incubator 1.

The connecting shaft 22 comprises a first section 221 and a second section 222, the first section 221 extends out of the first end cover 21a and is connected with the tested motor 5 in the incubator 1, and the second section 222 is connected with motor testing equipment outside the incubator 1. In one embodiment, the motor test equipment may include a torque sensor 3 and a servo motor 4. Grease may also be provided in the through hole of the first end cap 21a from which the first section 221 protrudes to prevent the circulation of air without a pressure difference between the inside of the housing 21 and the outside of the housing 21.

In one embodiment, the output shaft of the tested motor 5 can be connected with the first section 221 of the connecting shaft 22 through the coupling 6. The second section 222 of the connection shaft 22 may be connected to the torque sensor 3 by a coupling 6.

At least two bearings 23 are sleeved on the second section 222 to support the connecting shaft 22. The number of the bearings of the present embodiment is 2, and all the bearings are ceramic bearings. The ceramic bearing includes an outer ring 231, an inner ring 232, and a ceramic rolling element 233 interposed between the outer ring and the inner ring. An outer ring 231 of each bearing is tightly fitted to the inner wall of the housing 21, and an inner ring 232 of each bearing rotates synchronously with the connecting shaft 22. Because the heat resistance of the ceramic bearing is better, the supporting function of the ceramic bearing on the connecting shaft cannot be influenced by the temperature in the incubator, and the supporting stability of the connecting shaft can be improved.

In addition, optionally, several thrust rings 224 are sleeved on the connecting shaft 22, the thrust rings 224 are used for limiting the axial movement of the inner ring 232 of the ceramic bearing, and the thrust rings 224 and the connecting shaft rotate synchronously.

In some embodiments, a recess or a boss (not shown) may also be provided on the inner wall of the housing 21, such that the outer ring of the ceramic bearing is mounted in the recess or abuts against the boss to prevent axial movement of the outer ring of the ceramic bearing.

The power of the output shaft of the motor under test can be transmitted to the external test equipment through the connection structure formed by the housing 21, the connecting shaft 22 and the ceramic bearing 23. Therefore, the motor to be tested is ensured to be in the incubator for a long time, and meanwhile, the shaking of the tip of the output shaft of the motor caused by too long design is avoided. And the friction loss caused by the direct contact of the connecting shaft and the wall of the incubator is avoided through the shell, and the accuracy of a test result can be ensured.

Preferably, to further avoid possible effects of the ceramic bearing 23 on the temperature of the oven, a thermostatic structure may also be provided in the connection device, so that the ceramic bearing located in the spatial range covered by the thickness of the side wall of the oven is kept at a constant temperature, i.e. the thermostatic structure is suitable for ceramic bearings in the range of the through-hole for the wall of the oven, whereas ceramic bearings outside the range of the through-hole for the wall of the oven may not be used because they are in a room temperature environment. The implementation mode of the constant temperature structure can be as follows:

the thermostatic structure includes a fluid inflow passage 213 and a fluid outflow passage 214 provided in the main body 21b of the housing 21, and a bush 25 provided outside the outer ring 231 of the ceramic bearing 23. The fluid inflow passage 213 communicates with one end of the bushing 25, and the other end of the bushing 25 communicates with the fluid outflow passage 214.

The bushing 25 is tightly fitted with the housing 21, and the outer surface of the bushing 25 is provided with a channel 251 for fluid flow, wherein the channel 251 is spiral.

A fluid, which may be a liquid or a gas, which may be a compressed gas, is injected in the fluid inflow passage 213. The fluid flows into the bushing 25, passes through the spiral channel 251 on the bushing, and then flows out through the fluid outflow passage 214, so that the ceramic bearing 23 can be kept at a constant temperature without being affected by the temperature of the incubator, and further without affecting the support of the connecting shaft.

Example 2

The present embodiment provides a motor testing apparatus, as shown in fig. 3, which is different from embodiment 1 in that the at least two bearings are each an air bearing 24, the air bearing 24 includes an inner ring 241, an outer ring 242 and a sealing member 243, and the inner ring 241, the outer ring 22 and the sealing member 243 of the air bearing 24 form a closed space, and a compressed gas is filled in the closed space to support the connecting shaft 22. The air bearing 24 is sleeved on the second section 222 of the connecting shaft 22, an outer ring 242 of the air bearing 24 is tightly matched with the inner wall of the housing 21, and an inner ring 241 of the air bearing 24 rotates synchronously with the connecting shaft 22.

Because the air bearing 24 supports the connecting shaft 22 through compressed gas, large-area contact between the bearing 24 and the connecting shaft 22 is avoided, contact friction between the connecting shaft 22 and the shell 21 can be avoided, energy loss generated when power of an output shaft of the tested motor is transmitted to the connecting shaft is reduced, and accuracy of a test result is further improved.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. A connecting device for motor test is characterized in that a tested motor is arranged in an incubator, the connecting device penetrates through the side wall of the incubator, the connecting device comprises a shell, a connecting shaft and at least two bearings,

the connecting shaft comprises a first section of the connecting shaft and a second section of the connecting shaft, the first section of the connecting shaft extends out of the shell to be connected with the tested motor in the incubator, the second section of the connecting shaft is connected with the motor test equipment outside the incubator,

the at least two bearings are sleeved on the second section of the connecting shaft to support the connecting shaft, the outer ring of each bearing is tightly matched with the inner wall of the shell, the inner ring of each bearing and the connecting shaft rotate synchronously,

the connection means forms a seal between the housing and the side wall of the incubator when passing through the side wall.

2. The connecting device of claim 1 wherein the bearing is a ceramic bearing.

3. The connecting device as claimed in claim 2, wherein the connecting shaft is sleeved with a plurality of thrust rings for limiting axial movement of the inner race of the ceramic bearing.

4. The coupling device of claim 1, wherein the bearing is an air bearing.

5. The connecting device according to any one of claims 1 to 4, wherein the housing comprises a first end cap and a housing body fixedly connected with the first end cap, the first end cap is positioned in the incubator, and a first section of the connecting shaft extends out of the first end cap.

6. A connection device according to claim 5, wherein the bore of the first end cap through which the first section of the connection shaft extends is provided with grease.

7. The connecting device according to claim 5, further comprising a thermostatic structure including a fluid inflow passage and a fluid outflow passage provided in the housing main body, and a bush provided outside an outer ring of the bearing, the bearing being located within a space covered by a thickness of a side wall of the incubator, the fluid inflow passage communicating with one end of the bush, the other end of the bush communicating with the fluid outflow passage.

8. A connection device according to claim 7, wherein the bush is a close fit with the housing, the outer surface of the bush being provided with channels for the flow of fluid.

9. The connecting device of claim 8 wherein said channel is helical.

10. A motor testing device, comprising an incubator, a torque sensor, a servo motor and a connecting device according to any one of claims 1 to 9,

the tested motor is arranged in the incubator, the output shaft of the tested motor is connected with the first section of the connecting shaft of the connecting device,

the side wall of the incubator is provided with a through hole, the shell of the connecting device passes through the through hole and is sealed with the inner wall of the through hole,

11. The motor testing device of claim 10, wherein a rubber sleeve is disposed on an inner wall of the through hole, and the housing is sealed with the inner wall of the through hole through the rubber sleeve.