CN113375862A - Transmission device for dynamic balance detection of rotor part of micro turbojet engine - Google Patents
Transmission device for dynamic balance detection of rotor part of micro turbojet engine Download PDFInfo
- Publication number
- CN113375862A CN113375862A CN202110838533.7A CN202110838533A CN113375862A CN 113375862 A CN113375862 A CN 113375862A CN 202110838533 A CN202110838533 A CN 202110838533A CN 113375862 A CN113375862 A CN 113375862A
- Authority
- CN
- China
- Prior art keywords
- shaft
- transmission
- motor
- dynamic balance
- clutch shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/02—Details of balancing machines or devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/02—Details of balancing machines or devices
- G01M1/06—Adaptation of drive assemblies for receiving the body to be tested
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention relates to a transmission device for detecting the dynamic balance of a rotor part of a micro turbojet engine, which comprises a shaft transmission device for driving a driving shaft of the rotor part of the engine to be detected to rotate, wherein the shaft transmission device comprises a transmission shaft shell, a transmission shaft is rotatably arranged in the transmission shaft shell through a bearing, a clutch shaft is coaxially arranged at one end part of the transmission shaft, and a pin shaft is vertically and fixedly penetrated on the clutch shaft; the invention has simple structure, strong universality and convenient adjustment and use, can meet the whole dynamic balance requirements of the miniature turbojet engines with different types and different overall dimensions, can not interfere the whole dynamic balance measurement of the engines to the maximum extent, and effectively improves the accuracy of the balance measurement.
Description
Technical Field
The invention relates to the technical field of balance testing of a micro turbojet engine, in particular to a transmission device for testing a rotor component of the micro turbojet engine.
Background
The micro turbojet engine has high rotating speed, the rotating speed range is from 4 to 16 thousands of revolutions, if the unbalance amount of the rotor part is large when the rotor part rotates, the vibration of the engine is increased under high rotating speed, the noise is increased, the bearing is damaged when the bearing is serious, the service life of the engine is shortened, and even the engine is directly damaged. Therefore, rotor dynamic balancing is a very important step in engine assembly.
The transmission device of the conventional rotor dynamic balance equipment adopts the ring belt transmission, namely, one end of the ring belt is sleeved in the middle of a transmission shaft of a rotor part to be tested, and the other end of the ring belt is sleeved at a rotor of power equipment, so that the rotor part is driven to transmit. However, when the whole engine of the micro turbojet engine is balanced, the rotor part is wrapped in the shell, the ring belt cannot be sleeved in the middle of the transmission shaft, high-pressure gas is sprayed out by the air nozzle to drive the rotor part to rotate at the present stage, a high-pressure gas source is needed, and the rotating speed is difficult to control.
Disclosure of Invention
The invention aims to avoid the defects of the prior art and provides the transmission device for the rotor dynamic balance of the micro turbojet engine, which has the advantages of simple structure, strong universality, convenience in adjustment and use, capability of meeting the requirements of the rotor components of the micro turbojet engines with different models and different external dimensions on the dynamic balance, no interference on the whole engine dynamic balance measurement to the greatest extent and improvement on the measurement accuracy.
In order to achieve the purpose, the invention adopts the technical scheme that: a transmission device for detecting the dynamic balance of a rotor part of a micro turbojet engine comprises a shaft transmission device, a shaft transmission device and a detection device, wherein the shaft transmission device is used for driving a driving shaft of the rotor part of the detected engine to rotate so as to detect the dynamic balance of the rotor part; the shaft transmission device comprises a transmission shaft and a transmission shaft shell which are coaxially arranged with the driving shaft, the transmission shaft is rotatably arranged in the transmission shaft shell through a bearing, a clutch shaft is coaxially arranged at one end part of the transmission shaft, and a pin shaft is vertically and fixedly arranged on the clutch shaft in a penetrating way;
the clutch shaft sleeve is sleeved on the clutch shaft, a spiral hole is formed in the clutch shaft sleeve, and two end parts of the pin shaft extend out of the clutch shaft and penetrate through the spiral hole, so that the clutch shaft sleeve can rotate and stretch on the clutch shaft; the other end of the clutch shaft sleeve is sleeved at the end part of a driving shaft of the engine rotor component;
the two spiral holes are arranged corresponding to the two ends of the pin shaft; the two spiral holes are identical in shape and structure, the position of the first spiral hole is 180 degrees different from that of the second spiral hole by taking the axis of the clutch shaft sleeve as the center, the rotation lead of the spiral hole is 7.2-12 mm, and the width of the spiral hole is identical to the diameter of the pin shaft.
Furthermore, the two end parts of the spiral hole are the end stopping ends of the two pin shafts, the clutch shaft is used for driving the two ends of the pin shafts to move from one end stopping end to the other end stopping end in the two spiral holes, so that the clutch shaft sleeve extends out 1-4 mm along the axial direction, and conversely, the clutch shaft sleeve retracts 1-4 mm along the axial direction.
Furthermore, on the cylindrical surface, the central angle of a fan-shaped area formed by the axial projection of the spiral hole and the center of the cylindrical surface is 120-160 degrees.
Further, a sealing ring is further arranged on the clutch shaft sleeve sleeved at the end part of the driving shaft of the engine rotor component and used for tightly matching and connecting the driving shaft and the clutch shaft sleeve.
Furthermore, the pin shaft is fixed through a first screw and vertically arranged on the clutch shaft; the clutch shaft is fixedly sleeved at the end part of the transmission shaft through a second screw.
Further, the transmission shaft shell is arranged on the detection table board through a lifting bracket; the motor is supported on the detection table top through a motor support; the other end of the transmission shaft is connected with a power output shaft of the motor through a transmission belt mechanism, and the motor drives the transmission shaft to rotate through the transmission belt mechanism.
Furthermore, the motor support comprises a base and a motor hoop, and the motor is fixedly arranged on the base through the motor hoop;
the motor hoop is a bracket with a circular cavity, the motor is arranged in the circular cavity, an opening is formed in the middle position above the circular cavity, a fixing lug plate is arranged at the opening, and the motor is fastened in the circular cavity through the fixing lug plate and a bolt; the bottom of the motor hoop is provided with support legs which are fixedly arranged on the base through bolts.
Furthermore, the lifting support comprises a lifting platform and a transmission shaft support fixed on the lifting platform, and is used for supporting the transmission shaft shell on the lifting platform; the bottom of the transmission shaft support is fixed on the table top of the lifting table through a fastening bolt.
Furthermore, the transmission belt mechanism comprises a first transmission ring arranged on a power output shaft of the motor, a second transmission ring arranged on the transmission shaft, and a transmission ring belt sleeved on the first transmission ring and the second transmission ring and used for connecting the two transmission rings.
Furthermore, a shaft elastic retainer ring used for limiting the axial position of the transmission ring is arranged between the first transmission ring and a power output shaft of the motor; the second transmission ring is locked and installed at the end part of the transmission shaft through a locking nut.
The invention has the beneficial effects that: the transmission device for the dynamic balance of the rotor of the micro turbojet engine has the advantages of simple structure, strong universality and convenient adjustment and use, can meet the requirements of the complete machine dynamic balance of the micro turbojet engines with different models and different overall dimensions, selects a clutch shaft sleeve and a clutch shaft which are adaptive to the engine of the model according to the model and the central position of the engine when in use, and can adjust the height of the micro lifting platform and the relative position of the clutch and the engine, thereby carrying out the overall high-speed dynamic balance on the engine; the invention simultaneously adopts the extension of the clutch shaft sleeve, the rotating speed of the motor is higher than that of the rotor part of the micro turbojet engine to be measured, the motor extends out of the clutch shaft sleeve so as to drive the driving shaft and the rotor part of the engine to rotate, when the rotor part of the engine reaches the given rotating speed and is higher than the rotating speed of the clutch, namely the rotor part of the engine is driven to rotate, at the moment, the clutch shaft sleeve is retracted, the whole engine dynamic balance measurement of the engine is not interfered to the maximum extent, and the accuracy of the balance measurement is effectively improved.
Drawings
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic cross-sectional view of the shaft transmission of the present invention;
fig. 4 is a schematic structural diagram of the clutch sleeve of the invention.
Shown in the figure: 1. a motor; 2. a motor bracket; 21. a base; 22. a motor hoop; 23. fixing the ear plate; 24. a support leg; 3. a lifting support; 31. a lifting platform; 32. a drive shaft support; 33. fastening a bolt; 4. a shaft transmission device; 41. a drive shaft; 42. a clutch shaft; 43. a clutch hub; 44. a pin shaft; 45. a helical bore; 46. a first screw; 47. a seal ring; 48. a second screw; 49. a drive shaft housing; 51. a first drive coil; 52. a second drive ring; 53. a drive ring belt; 54. a circlip for the shaft; 55. locking the nut; 6. and the driving shaft of the tested engine rotor component.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example 1: as shown in fig. 1, 2, 3 and 4, the transmission device for detecting the dynamic balance of the rotor part of the micro turbojet engine comprises a motor 1, wherein the motor 1 is supported on a detection table board through a motor support 2; the detection table board is also provided with a lifting support 3, the lifting support 3 is provided with a shaft transmission device 4, and the shaft transmission device 4 is used for driving a driving shaft 6 of a rotor part of the detected engine to rotate so as to detect the dynamic balance of the rotor part;
the shaft transmission device 4 comprises a transmission shaft 41 and a transmission shaft shell 49 which are coaxially arranged with the driving shaft, the transmission shaft 41 is rotatably arranged in the transmission shaft shell 49 through a bearing, the transmission shaft shell 49 is arranged on the lifting support 3, a clutch shaft 42 is coaxially arranged at one end part of the transmission shaft 41, a pin shaft 44 is vertically and fixedly arranged on the clutch shaft 42 in a penetrating way, and two end parts of the pin shaft 44 extend out of the surface of the clutch shaft 42; the clutch device is characterized by further comprising a clutch shaft sleeve 43, one end of the clutch shaft sleeve 43 is sleeved on the clutch shaft 42, a spiral hole 45 is formed in the clutch shaft sleeve 43, two ends of a pin shaft 44 extending out of the surface of the clutch shaft 42 penetrate through the spiral hole 45, and the clutch shaft sleeve 43 is made to extend and retract on the clutch shaft 42 in a rotating mode; the other end of the clutch shaft sleeve 43 is sleeved on the end part of a driving shaft of the engine rotor component;
two spiral holes 45 which are arranged corresponding to the two end parts of the pin shaft 44 are arranged on the clutch shaft sleeve 43; the two spiral holes 45 have the same shape and structure, and the position of the first spiral hole is 180 degrees different from that of the second spiral hole by taking the axis of the clutch shaft sleeve 43 as the center; the rotating lead of the spiral hole 45 is 7.2-12 mm, and the width of the spiral hole 45 is the same as the diameter of the pin shaft 44; the two ends of the spiral hole 45 are the end-to-end ends of the two pin shafts 44, and the clutch shaft 42 is used for driving the two ends of the pin shafts 44 to move from one end-to-end to the other end-to-end in the two spiral holes 45, so that the clutch shaft sleeve 43 extends out 1-4 mm along the axial direction, and conversely, the clutch shaft sleeve 43 retracts 1-4 mm along the axial direction. On the cylindrical surface, the central angle of a fan-shaped area formed by the axial projection of the spiral hole 45 and the center of the cylindrical surface is 120-160 degrees.
The other end of the transmission shaft 41 is connected with a power output shaft of the motor 1 through a transmission belt mechanism, and the motor 1 drives the transmission shaft 41 to rotate through the transmission belt mechanism. Two spiral holes 45 are formed in the clutch sleeve 43 corresponding to both ends of the pin 44. And a sealing ring 47 is also arranged on the clutch shaft sleeve 43 sleeved at the end part of the driving shaft of the engine rotor component and used for tightly matching and connecting the driving shaft and the clutch shaft sleeve 43. The pin shaft 44 is fixed and vertically arranged on the clutch shaft 42 through a first screw 46; the clutch shaft 42 is fixedly sleeved at the end of the transmission shaft 41 through a second screw 48.
The motor bracket 2 comprises a base 21 and a motor hoop 22, and the motor 1 is fixedly arranged on the base 21 through the motor hoop 22; the motor hoop 22 is a bracket with a circular cavity, the motor 1 is arranged in the circular cavity, an opening is arranged in the middle position above the circular cavity, a fixing lug plate 23 is arranged at the opening, and the motor 1 is fastened in the circular cavity through the fixing lug plate 23 and a bolt; the bottom of the motor hoop 22 is provided with a support leg 24, and the support leg 24 is fixedly installed on the base 21 through a bolt.
The lifting bracket 3 comprises a lifting platform 31 and a transmission shaft support 32 fixed on the lifting platform 31, and is used for supporting a transmission shaft shell 49 on the lifting platform 31; the bottom of the transmission shaft support 32 is fixed on the table top of the lifting table 31 through a fastening bolt 33.
The transmission belt mechanism comprises a first transmission ring 51 arranged on a power output shaft of the motor 1 and a second transmission ring 52 arranged on the transmission shaft 41, wherein a transmission ring belt 53 is sleeved on the first transmission ring 51 and the second transmission ring 52 and is used for connecting the two transmission rings. A shaft elastic retainer ring 54 used for limiting the axial position of the transmission ring is arranged between the first transmission ring 51 and the power output shaft of the motor 1; the second driving ring 52 is locked and mounted on the end of the driving shaft 41 by a locking nut 55.
When the rotor part of the micro turbojet engine needs to be dynamically balanced, the clutch shaft sleeve 43, the clutch shaft 42 and the sealing ring 47 which are adaptive to the engine of the type are selected firstly, then the lifting table 31 is moved, the clutch shaft sleeve 43 is made to coincide with the central line of the driving shaft 6 of the rotor part of the tested engine along the axial direction, the motor 1 is started, the rotating driving shaft 41 is driven through the driving belt mechanism, the clutch shaft sleeve 1 is driven to extend out in a rotating mode, the sealing ring 47 is made to cling to the top end of the driving shaft 6 of the rotor part of the tested engine so as to drive the rotor part to rotate, the driving shaft 6 of the rotor part of the tested engine is pressed and driven to rotate to the required rotating speed, and therefore the dynamic balancing of the rotor part of the micro turbojet engine is completed. The dynamic balance adjusting device has the advantages of simple structure, strong universality and convenience in adjustment and use, and can meet the requirements of the whole dynamic balance of the miniature turbojet engines of different models and different overall dimensions.
The invention adopts the clutch shaft sleeve 43 to stretch out and draw back, the purpose is that the motor rotation speed is higher than the rotation speed of the rotor part of the micro turbojet engine to be measured, the clutch shaft sleeve 43 extends out, so as to drive the drive shaft 6 of the rotor part of the engine and the rotor part to rotate, when the rotor part of the engine reaches the given rotation speed and is higher than the rotation speed of the clutch, namely, the clutch is driven to rotate, at the moment, the clutch shaft sleeve 43 retracts, and the purpose of not interfering the whole dynamic balance measurement of the engine to the maximum extent is achieved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The transmission device for detecting the dynamic balance of the rotor part of the micro turbojet engine is characterized by comprising a shaft transmission device (4), wherein the shaft transmission device (4) is used for driving a driving shaft (6) of the rotor part of the engine to be detected to rotate so as to detect the dynamic balance of the rotor part; the shaft transmission device (4) comprises a transmission shaft (41) and a transmission shaft shell (49) which are coaxially arranged with the driving shaft (6), the transmission shaft (41) is rotatably arranged in the transmission shaft shell (49) through a bearing, a clutch shaft (42) is coaxially arranged at one end part of the transmission shaft (41), and a pin shaft (44) is vertically and fixedly arranged on the clutch shaft (42) in a penetrating way;
the clutch device is characterized by further comprising a clutch shaft sleeve (43), one end of the clutch shaft sleeve (43) is sleeved on the clutch shaft (42), a spiral hole (45) is formed in the clutch shaft sleeve (43), two end portions of the pin shaft (44) extend out of the clutch shaft (42) and penetrate through the spiral hole (45), and the clutch shaft sleeve (43) is made to extend and retract on the clutch shaft (42) in a rotating mode; the other end of the clutch shaft sleeve (43) is sleeved at the end part of a driving shaft (6) of the engine rotor component;
the spiral holes (45) comprise two spiral holes and are arranged corresponding to the two end parts of the pin shaft (44); the two spiral holes (45) are identical in shape and structure, the position of the first spiral hole is 180 degrees different from that of the second spiral hole by taking the axis of the clutch shaft sleeve (43) as the center, the rotating lead of the spiral hole (45) is 7.2-12 mm, and the width of the spiral hole (45) is identical to the diameter of the pin shaft (44).
2. The transmission device for detecting the dynamic balance of the rotor component of the micro turbojet engine according to claim 1, wherein the two ends of the spiral hole (45) are the stop ends of the two pin shafts (44), and the clutch shaft (42) is used for driving the two ends of the pin shafts (44) to move from one stop end to the other stop end in the two spiral holes (45) so as to enable the clutch shaft sleeve (43) to extend 1-4 mm in the axial direction, and conversely, the clutch shaft sleeve (43) to retract 1-4 mm in the axial direction.
3. The transmission device for detecting the dynamic balance of the rotor component of the micro turbojet engine as claimed in claim 1, wherein the central angle of a sector area formed by the axial projection of the spiral hole (45) and the center of the cylindrical surface on the cylindrical surface is 120 to 160 degrees.
4. The transmission device for detecting the dynamic balance of the rotor component of the micro turbojet engine as claimed in claim 1, wherein a seal ring (47) is further arranged on the clutch shaft sleeve (43) sleeved on the end portion of the driving shaft of the rotor component of the engine and used for tightly matching and connecting the driving shaft with the clutch shaft sleeve (43).
5. The transmission device for detecting the dynamic balance of the rotor component of the micro turbojet engine as claimed in claim 1, wherein the pin shaft (44) is fixed and vertically arranged on the clutch shaft (42) through a first screw (46); the clutch shaft (42) is fixedly sleeved at the end part of the transmission shaft (41) through a second screw (48).
6. The transmission device for detecting the dynamic balance of the rotor component of the micro turbojet engine as claimed in claim 1, wherein the transmission shaft housing (49) is mounted on the detection table through a lifting bracket (3); the detection table is characterized by further comprising a motor (1), wherein the motor (1) is supported on the detection table top through a motor support (2); the other end of the transmission shaft (41) is connected with a power output shaft of the motor (1) through a transmission belt mechanism, and the motor (1) drives the transmission shaft (41) to rotate through the transmission belt mechanism.
7. The transmission device for detecting the dynamic balance of the rotor part of the micro turbojet engine as claimed in claim 6, wherein the motor bracket (2) comprises a base (21) and a motor clamp (22), and the motor (1) is fixedly arranged on the base (21) through the motor clamp (22);
the motor hoop (22) is a bracket with a circular cavity, the motor (1) is arranged in the circular cavity, an opening is formed in the middle position above the circular cavity, a fixing lug plate (23) is arranged at the opening, and the motor (1) is fastened in the circular cavity through the fixing lug plate (23) and a bolt; the bottom of the motor hoop (22) is provided with a support leg (24), and the support leg (24) is fixedly installed on the base (21) through a bolt.
8. The transmission device for detecting the dynamic balance of the rotor component of the micro turbojet engine as claimed in claim 6, wherein the lifting bracket (3) comprises a lifting table (31) and a transmission shaft support (32) fixed to the lifting table (31) and used for supporting the transmission shaft housing (49) on the lifting table (31); the bottom of the transmission shaft support (32) is fixed on the table surface of the lifting table (31) through a fastening bolt (33).
9. The transmission device for detecting the dynamic balance of the rotor component of the micro turbojet engine as claimed in claim 6, wherein the transmission belt mechanism comprises a first transmission coil (51) arranged on the power output shaft of the motor (1), a second transmission coil (52) arranged on the transmission shaft (41), and a transmission coil belt (53) sleeved on the first transmission coil (51) and the second transmission coil (52) and used for connecting the two transmission coils.
10. The transmission device for detecting the dynamic balance of the rotor component of the micro turbojet engine as claimed in claim 9, wherein a shaft circlip (54) for limiting the axial position of the transmission ring is arranged between the first transmission ring (51) and the power output shaft of the motor (1); the second transmission ring (52) is locked and installed at the end of the transmission shaft (41) through a locking nut (55).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110838533.7A CN113375862A (en) | 2021-07-23 | 2021-07-23 | Transmission device for dynamic balance detection of rotor part of micro turbojet engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110838533.7A CN113375862A (en) | 2021-07-23 | 2021-07-23 | Transmission device for dynamic balance detection of rotor part of micro turbojet engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113375862A true CN113375862A (en) | 2021-09-10 |
Family
ID=77582807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110838533.7A Pending CN113375862A (en) | 2021-07-23 | 2021-07-23 | Transmission device for dynamic balance detection of rotor part of micro turbojet engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113375862A (en) |
-
2021
- 2021-07-23 CN CN202110838533.7A patent/CN113375862A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109765486B (en) | Large-scale generator load testing method | |
| CN109855868B (en) | Dynamic test method and test equipment for axial stiffness of bearing | |
| CN106769043B (en) | A kind of angular contact bearing bearing test methods that inner ring and outer ring rotates simultaneously | |
| CN203534824U (en) | An inner and outer double-rotor fault simulation experiment table based on elastic foundation | |
| CN109159881B (en) | A kind of ship thrust bearing device with low frequency vibration isolation effect | |
| CN208399061U (en) | The dynamometer motor floating support structure of Heavy-duty chassis dynamometer | |
| CN215448308U (en) | Transmission device for dynamic balance detection of rotor part of micro turbojet engine | |
| CN113375862A (en) | Transmission device for dynamic balance detection of rotor part of micro turbojet engine | |
| CN111521371A (en) | Rotary cylinder model test device | |
| CN108827538B (en) | Automatic centering and grading clamping device for double-mass flywheel of full-automatic balancing machine | |
| CN116878736B (en) | Mechanical design motion balance detection device and detection method | |
| CN108398207A (en) | A kind of two plane balancing machine | |
| CN107831439B (en) | BSG motor bench test tool and test method thereof | |
| CN208568166U (en) | A kind of two plane balancing machine | |
| CN109612631B (en) | Engine rotational inertia measuring device | |
| CN107576500B (en) | Automobile engine tension wheel shaft bearing vibration mechine and its method for testing vibration | |
| CN212391157U (en) | Dynamometer and motor test device | |
| CN208568165U (en) | A kind of driving structure of two plane balancing machine | |
| CN211347363U (en) | Slip ring test tool | |
| CN220855051U (en) | Electric actuator output shaft return difference detection device | |
| CN208297131U (en) | A kind of rear axle box assembly for NVH off-line test platform | |
| CN221350350U (en) | Ball bearing friction torque static pressure testing arrangement | |
| CN212585914U (en) | Unbalanced rotor mechanism and unbalanced rotor fault simulation device | |
| CN220961772U (en) | Torque motor speed fluctuation testing device | |
| CN114964624B (en) | Dynamic balance testing device for automobile friction fittings |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |