CN109708873B - Method and device for testing torque transmission characteristics of clutch in transmission assembly - Google Patents

Method and device for testing torque transmission characteristics of clutch in transmission assembly Download PDF

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Publication number
CN109708873B
CN109708873B CN201711015051.1A CN201711015051A CN109708873B CN 109708873 B CN109708873 B CN 109708873B CN 201711015051 A CN201711015051 A CN 201711015051A CN 109708873 B CN109708873 B CN 109708873B
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transmission
clutch
torque
test
pressure plate
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CN109708873A (en
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张晨虬
邱佳伟
郭必胜
陈伟芳
殷海庭
杨辉
沈勇
夏琪伟
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SAIC Motor Corp Ltd
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SAIC Motor Corp Ltd
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Abstract

The invention discloses a test method and a device for the torque transmission characteristic of a clutch in a transmission assembly, wherein the test method comprises the following steps: fixing a mass flywheel of the transmission assembly, switching the transmission to a forward gear and opening the clutch; driving the long half shaft and the short half shaft to rotate so as to drive a transmission input shaft of the transmission assembly to rotate; when the transmission input shaft rotates to a target rotating speed, a pressure plate of the clutch is pushed to move towards a driven plate, and the input torque transmitted to the transmission input shaft by the clutch is acquired in real time; and when the acquired input torque reaches the target torque, stopping pushing the pressure plate, and recording the current movement amount of the pressure plate. The test method can greatly reduce the test cost of the torque transmission characteristic of the clutch in the transmission assembly.

Description

Method and device for testing torque transmission characteristics of clutch in transmission assembly
Technical Field
The invention relates to the technical field of automobile transmission bench tests, in particular to a method and a device for testing the torque transmission characteristic of a clutch based on a three-motor transmission assembly bench.
Background
When testing a transmission assembly of an automobile, a torque transmission characteristic test needs to be performed on a clutch, and a common method is to separate the clutch from the transmission assembly, install the clutch on a special clutch test bench, perform a test, and after the clutch is separated, during the test, a hydraulic or mechanical function module needs to be designed to control the displacement of the clutch and record the displacement in real time.
The hydraulic or mechanical function module is complex in structure and high in design cost, and the clutch test bench is single in function and increases marginal cost.
Therefore, how to reduce the test cost of the clutch torque transfer characteristics in the transmission assembly is a technical problem that needs to be solved currently by those skilled in the art.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a method for testing torque transmission characteristics of a clutch in a transmission assembly, comprising the steps of:
fixing a mass flywheel of the transmission assembly, switching the transmission to a forward gear and opening the clutch;
driving the long half shaft and the short half shaft to rotate so as to drive a transmission input shaft of the transmission assembly to rotate;
when the transmission input shaft rotates to a target rotating speed, a pressure plate of the clutch is pushed to move towards a driven plate, and the input torque transmitted to the transmission input shaft by the clutch is acquired in real time;
and when the acquired input torque reaches the target torque, stopping pushing the pressure plate, and recording the current movement amount of the pressure plate.
According to the test method provided by the invention, when the torque transmission characteristic of the clutch is tested, the clutch does not need to be peeled from the transmission assembly, the transmission assembly is arranged in the whole vehicle posture during the test, the long half shaft and the short half shaft are driven to rotate to drag the transmission input shaft to rotate, after the transmission input shaft rotates to a set target rotating speed, the clutch starts to be combined, and after the input torque of the transmission input shaft reaches the set target torque, the displacement of the clutch is recorded; compared with the prior art, the test method has the advantages that the clutch does not need to be separated independently, the control module with complex design is avoided to control the displacement of the clutch correspondingly, the test is still carried out in the form of the transmission assembly, so that the test bench of the transmission assembly can be used for carrying out the test, a test device does not need to be designed independently, and the test cost is greatly reduced.
Optionally, the input torque is calculated according to the gear speed ratio and the transmission efficiency of the transmission and the driving torque for driving the long half shaft and the short half shaft to rotate.
Optionally, the transmission is switched to a forward gear with the largest speed ratio.
Optionally, when the platen is pushed, the platen is pushed one by one with a set movement amount.
Optionally, the range of the set movement amount is 0.05 mm.
Optionally, after the transmission input shaft rotates to the target rotation speed, whether the transmission input shaft is kept at the target rotation speed within a preset time period is further judged, if yes, the pressure plate of the clutch is pushed to move, and if not, the test is stopped, and set faults are checked.
Optionally, when the input torque reaches the target torque, it is further determined whether the input torque is maintained at the target torque within a preset time period, if so, the current displacement of the pressure plate is recorded, and if not, the pressure plate is continuously pushed.
Optionally, during the test, the temperature of the clutch is monitored and recorded, and when the temperature of the clutch exceeds a set temperature, the alarm is given out and the vehicle is stopped.
The invention also provides a test device for the torque transmission characteristics of the clutch in the transmission assembly, which comprises:
the test bed is provided with two motors, the two motors are respectively connected with a long half shaft and a short half shaft, and the long half shaft and the short half shaft are connected with a differential mechanism of the transmission assembly;
one end of the mounting plate is fixed with the test bed, and the other end of the mounting plate is fixedly connected with a mass flywheel of the transmission assembly;
the detection module is used for acquiring the output torque and the output rotating speed of the two motors, the rotating speed of the input shaft of the transmission and the displacement of the clutch;
and the control module is in communication connection with the detection module and is used for controlling the pressure plate of the clutch to start moving when judging that the rotating speed of the input shaft of the transmission reaches a pre-stored target rotating speed, meanwhile, calculating the input torque of the input shaft of the transmission according to the output torques of the two motors, the current gear speed ratio of the transmission and the transmission efficiency of the transmission, controlling the pressure plate to stop moving when judging that the input torque reaches the pre-stored target torque, and recording the moving amount of the pressure plate.
The testing device is consistent with the principle of the testing method, has corresponding technical effects, and is not repeatedly discussed here.
Optionally, the two torque measuring instruments are respectively installed on the two motors;
a rotational speed sensor for detecting a rotational speed of the transmission input shaft;
and the displacement sensor is used for detecting the movement amount of the pressure plate.
Optionally, the detection module further includes a temperature sensor embedded in the pressure plate and/or the inertia plate of the clutch.
Optionally, the test bench is a three-motor transmission assembly test bench.
Drawings
FIG. 1 is a flow chart of one embodiment of a method of testing clutch torque transfer characteristics provided by the present invention;
FIG. 2 is a schematic view showing a structure of a clutch torque transmission characteristic testing apparatus according to the present invention;
FIG. 3 is a schematic illustration of a coupling arrangement for the transmission input shaft, clutch and mass flywheel of the transmission assembly of FIG. 2.
Wherein, the one-to-one correspondence between component names and reference numbers in fig. 2 and 3 is as follows:
the transmission comprises a transmission assembly 10, a transmission 11, a transmission input shaft 111, a front shell 112, a differential 12, a clutch 13, a pressure plate 131, a driven plate 132, a mass flywheel 14, a long half shaft 15 and a short half shaft 16;
a first motor 20, a second motor 30, a torque measuring instrument 40 and a mounting plate 50.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
For ease of understanding and simplicity of description, the following description will be made with reference to a method and apparatus for testing the torque transmission characteristics of a clutch, and the advantageous effects will not be repeated.
Referring to fig. 1 to 3, fig. 1 is a flowchart illustrating a method for testing a torque transmission characteristic of a clutch according to an embodiment of the present invention; FIG. 2 is a schematic view showing a structure of a clutch torque transmission characteristic testing apparatus according to the present invention; FIG. 3 is a schematic illustration of a coupling arrangement for the transmission input shaft, clutch and mass flywheel of the transmission assembly of FIG. 2.
Herein, the transmission assembly 10 of the automobile includes a differential 12, a transmission 11, a clutch 13 and a mass flywheel 14, wherein two ends of the differential 12 are respectively connected to a long half shaft 15 and a short half shaft 16, and the connection relationship between the other components is consistent with that in normal use, referring to fig. 3, the transmission input shaft 111 is fixedly connected to a driven plate 132 of the clutch 13, and a pressure plate 131 of the clutch 13 is fixedly connected to the mass flywheel 14.
In this embodiment, the method of testing the torque transfer characteristics of the clutch includes the steps of:
s1, fixing the mass flywheel 14 of the transmission assembly 10; shifting the transmission 11 to a forward gear, opening the clutch 13;
the flywheel 14 of the transmission assembly 10 is fixed to the pressure plate 131 of the clutch 13 and fixed to the mounting plate 50, that is, after the flywheel 14 is fixed, the pressure plate 131 of the clutch 13 is also fixed. It should be noted that the fixed pressure plate 131 means that the pressure plate 131 cannot rotate but can still move axially relative to the driven plate 132 of the clutch 13.
In this embodiment, the test apparatus for the clutch torque transmission characteristic includes a test bed and a mounting plate 50; the test bench is used for supporting the transmission assembly 10, specifically, the mass flywheel 14 of the transmission assembly 10 is fixedly connected with the mounting plate 50, the front housing 112 of the transmission 11 is fixedly connected with the mounting plate 50 through bolts, that is, the front housing 112 and the mass flywheel 14 are fixedly connected on the mounting plate 50, and the mounting plate 50 is further fixed on the test bench, so that the mass flywheel 14 of the transmission assembly 10 is fixed.
S2, driving the long half shaft 15 and the short half shaft 16 to rotate so as to drive the transmission input shaft 111 of the transmission assembly 10 to rotate;
the long half shaft 15 and the short half shaft 16 are driven to rotate, and the transmission input shaft 111 is pulled back from the differential 12 side to rotate.
The testing device further comprises a first motor 20 and a second motor 30 which are arranged on the testing bench and are respectively connected with the long half shaft 15 and the short half shaft 16 so as to drive the long half shaft 15 and the short half shaft 16 to rotate.
The connecting tool for connecting the first motor 20 and the long half shaft 15 and the connecting tool for connecting the second motor 30 and the short half shaft 16 can refer to the existing structure, and are not described again.
That is, in this embodiment, a motor is used as a driving source for driving the long half shaft 15 and the short half shaft 16 to rotate.
In a specific scheme, the output rotating speeds of the first motor 20 and the second motor 30 are kept consistent so as to ensure the safety of the differential 12; it will be appreciated that in actual testing, the output speeds of the first and second electric machines 20, 30 may have a speed differential that is within the tolerance of the differential 12 so as not to damage the differential. In comparison, the output rotating speeds of the two motors are kept, so that the control test is facilitated, the operation is convenient, and the differential mechanism 12 can be protected.
S3, when the transmission input shaft 111 rotates to the target speed, the pressure plate 131 of the clutch 13 is pushed to move towards the driven plate 132, and the input torque transmitted by the clutch 13 to the transmission input shaft 111 is obtained in real time.
The testing device also comprises a detection module and a control module.
Specifically, the detecting module includes two torque measuring devices 40 respectively mounted on the first motor 20 and the second motor 30 for detecting the output torque and the output rotation speed of the two motors.
The detection module further includes a rotation speed sensor for detecting the rotation speed of the transmission input shaft 111 and a displacement sensor for detecting the amount of movement of the pressure plate 131.
Each part of the detection module is in communication connection with the control module, so that the control module can acquire each detection parameter of the detection module.
In the test, after acquiring the rotation speed of the transmission input shaft 111 and judging that the rotation speed reaches the target rotation speed, the control module controls the pressure plate 131 of the clutch 13 to start moving, and simultaneously calculates the input torque of the transmission input shaft 111 according to the output torques of the first motor 20 and the second motor 30, the gear speed ratio of the current transmission 11 and the transmission efficiency of the transmission 11.
It should be noted that, at the initial stage of the test, that is, in the foregoing step S1, the transmission 11 needs to be switched to a forward gear position, the gear position speed ratio is a gear position speed ratio corresponding to the forward gear position of the transmission 11, both the gear position speed ratio and the transmission efficiency of the transmission 11 can be stored in the control module in advance, and the control module adjusts the corresponding gear position speed ratio according to the received transmission gear position information to calculate the input torque of the transmission input shaft 111.
The target rotational speed can be determined according to the test requirements.
S4, when the acquired input torque of the transmission input shaft 111 reaches the target torque, the pressure plate 131 stops being pushed, and the current amount of movement of the pressure plate 131 is recorded.
Specifically, the control module, after calculating the input torque of the transmission input shaft 111 and also determining that the input torque reaches the target torque, controls the pressure plate 131 of the clutch 13 to stop moving and records the amount of movement of the pressure plate 131.
The target torque here is also determined according to the test requirements.
Thus, the test of one torque point at a certain target rotating speed is completed; after the test is completed, the clutch 13 is shifted back to zero, and after the gear of the transmission 11 is switched to the neutral position, the next torque point can be tested according to the above steps, so that the torque transmission characteristic curve corresponding to the target rotation speed can be obtained after a plurality of tests.
According to the test method and the test device provided by the invention, when the clutch torque transmission characteristic is tested, the clutch 13 does not need to be peeled from the transmission assembly 10, during the test, the transmission assembly 10 is arranged in a whole vehicle posture, the transmission input shaft 111 is driven to rotate by driving the long half shaft 15 and the short half shaft 16 to rotate, after the transmission input shaft 111 rotates to a set target rotating speed, the clutch 13 is combined, and after the input torque of the transmission input shaft 111 reaches a set target torque, the displacement of the clutch 13 is recorded; compared with the prior art, the test method does not need to separate the clutch 13, accordingly avoids designing a complicated control module to control the displacement of the clutch 13, accordingly, the test device does not need to separately design a hydraulic or mechanical function module for controlling the displacement of the clutch, and the test cost can be greatly reduced.
Because the test method still tests in the form of the transmission assembly 10, the test bench of the test device can utilize the existing three-motor transmission assembly test bench to test, and the test bench does not need to be designed independently, so that the test cost is greatly reduced.
It should be noted that the existing three-motor transmission assembly test bench has three motors, and for convenience of description, the three motors are referred to as a motor a, a motor B and a motor C; the motor A is used for being connected with the transmission input shaft 111 in other tests of the transmission assembly 10, and the other motors B and C can be connected with the long half shaft 15 and the short half shaft 16 of the transmission assembly 10 according to different test types, namely, the relative positions of the three motors of the existing three-motor transmission assembly test bench are fixed, when the three-motor transmission assembly test bench is adopted in the test, only two motors are needed to be used, namely the motor B and the motor C, and because the test does not need the motor A, the shape structure and the like of the mounting plate 50 are required to be prevented from interfering with the motor A when the mounting plate 50 is designed.
In a specific embodiment, in step S1, the gear position of the transmission 11 is switched to the forward gear position with the largest speed ratio, which is usually the 1 st gear, so that the output torque is large under the same input torque, and thus the torque of the first and second electric machines 20 and 30 can be measured by the wide-range torque measuring instrument 40, so as to improve the measurement accuracy.
Specifically, in step S3, when the pressure plate 131 is pushed, the pressure plate 131 is pushed one by a predetermined movement amount, so that a momentary shock due to too fast engagement of the clutch 13 can be avoided.
Specifically, the movement amount is set to specifically 0.05mm, i.e., the platen 131 is pushed with a movement amount of 0.05mm at a time.
The set movement amount is confirmed by a plurality of tests.
In a specific scheme, in step S3, after the transmission input shaft 111 rotates to the target rotation speed, it is further determined whether the transmission input shaft 111 is maintained at the target rotation speed within a preset time, if so, the pressure plate 131 of the clutch 13 is pushed to move, if not, the test is stopped, and a setting fault is checked, where the setting fault indicates whether the relevant settings of the transmission and the test bed are correct, for example, whether the gear is correctly engaged, whether the rotation speeds of the first motor 20 and the second motor 30 reach the target rotation speed, and the like.
The preset time can also be determined according to the actual test requirement.
Thus, the transmission input shaft 111 can be ensured to reach the target rotating speed, and the test error can be reduced.
In a specific embodiment, in step S4, when the input torque of the transmission input shaft 111 reaches the target torque, it is further determined whether the input torque is maintained at the target torque within a preset time, if so, the current displacement of the pressure plate 131 is recorded, and if not, the pressure plate 131 continues to be pushed.
The preset time can also be determined according to the actual test requirement.
Thus, the input torque of the transmission input shaft 111 can be surely ensured to reach the target torque, and the test error can be reduced.
In a particular embodiment, the temperature of the clutch 13 is also monitored and recorded during the test.
Since the clutch 13 transmits torque by friction, the friction coefficient of the clutch disk is affected to some extent by temperature, and when the same torque is transmitted, the displacement of the clutch 13 varies depending on the temperature.
In the test process, the temperature is monitored, and the relationship between the temperature and the displacement of the clutch 13 can be obtained so as to correct the corresponding relationship between the displacement and the transmission torque of the clutch, so that the test result is more accurate.
In addition, the monitoring temperature can also alarm and stop when the temperature of the clutch 13 exceeds the set temperature so as to prevent the temperature rise from exceeding the bearing limit of the clutch 13 too fast and avoid the ablation of the clutch 13.
Accordingly, the testing apparatus includes a temperature sensor for monitoring the temperature of the clutch 13, it can be understood that the pressure plate 131 of the clutch 13 is fixedly connected with the mass flywheel 14, the mass flywheel 14 is fixed on the test bench through the mounting plate 50, so that the pressure plate 131 does not rotate and the rotating speed is always zero during the test, and the driven plate 132 of the clutch 13 is fixedly connected with the transmission input shaft 111, so that the driven plate 132 of the clutch 13 rotates along with the rotation of the transmission input shaft 111; therefore, in order to avoid the phenomenon that a circuit connected with the displacement sensor breaks down or fails due to torsion, during specific setting, the temperature sensor for measuring the temperature of the clutch is embedded in the pressure plate 131 and/or the inertia plate, holes can be formed in the pressure plate 131 and the inertia plate in advance, the temperature sensor is embedded in the temperature sensor, and during actual operation, more than two temperature sensors can be embedded in each temperature measuring point in order to prevent accidental falling off in the test process.
The method and apparatus for testing the torque transfer characteristics of a clutch in a transmission assembly provided by the present invention have been described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (12)

1. A method of testing the torque transfer characteristics of a clutch in a transmission assembly comprising the steps of:
a mass flywheel (14) for fixing the transmission assembly (10), switching the transmission (11) to a forward gear and opening the clutch (13);
driving a long half shaft (15) and a short half shaft (16) to rotate so as to drive a transmission input shaft (111) of the transmission assembly (10) to rotate;
after the transmission input shaft (111) rotates to a target rotating speed, a pressure plate (131) of the clutch (13) is pushed to move towards a driven plate (132), and the input torque transmitted to the transmission input shaft (111) by the clutch (13) is acquired in real time;
when the acquired input torque reaches a target torque, pushing of the pressure plate (131) is stopped, and the current movement amount of the pressure plate (131) is recorded.
2. Test method according to claim 1, characterized in that the input torque is calculated from the gear ratio of the transmission (11), the transmission efficiency and the drive torque driving the rotation of the long half shaft (15) and the short half shaft (16).
3. Test method according to claim 1, characterised in that the transmission (11) is shifted to the forward gear with the largest speed ratio.
4. The test method according to claim 1, wherein the platen (131) is pushed one by a set movement amount when the platen (131) is pushed.
5. The test method according to claim 4, wherein the set movement amount is in a range of 0.05 mm.
6. The test method according to any one of claims 1 to 5, characterized in that after the transmission input shaft (111) rotates to the target rotation speed, whether the transmission input shaft (111) is maintained at the target rotation speed within a preset time period is further judged, if yes, a pressure plate (131) of the clutch (13) is pushed to move, and if no, the test is stopped, and a setting fault is checked.
7. The test method according to any one of claims 1 to 5, characterized in that when the input torque reaches the target torque, it is further determined whether the input torque is maintained at the target torque within a preset time period, if so, the current displacement of the pressure plate (131) is recorded, and if not, the pressure plate (131) is continuously pushed.
8. Test method according to any of claims 1-5, characterized in that during the test, the temperature of the clutch (13) is also monitored and recorded and an alarm is triggered when the temperature of the clutch (13) exceeds a set temperature.
9. A test device for clutch torque transfer characteristics in a transmission assembly, comprising:
the test bed is provided with two motors, the two motors are respectively connected with a long half shaft (15) and a short half shaft (16), and the long half shaft (15) and the short half shaft (16) are connected with a differential (12) of a transmission assembly (10);
one end of the mounting plate (50) is fixed with the test bed, and the other end of the mounting plate is fixedly connected with a mass flywheel (14) of the transmission assembly (10);
the detection module is used for acquiring the output torque and the output rotating speed of the two motors, the rotating speed of a transmission input shaft (111) and the displacement of a clutch (13);
and the control module is in communication connection with the detection module and is used for controlling the pressure plate (131) of the clutch (13) to start moving when the rotating speed of the transmission input shaft (111) reaches a pre-stored target rotating speed, meanwhile, calculating the input torque of the transmission input shaft (111) according to the output torques of the two motors, the current gear speed ratio of the transmission (11) and the transmission efficiency of the transmission (11), controlling the pressure plate (131) to stop moving when the input torque is judged to reach the pre-stored target torque, and recording the moving amount of the pressure plate (131).
10. The testing device of claim 9, wherein the detection module comprises:
two torque measuring instruments (40) respectively mounted on the two motors;
a rotational speed sensor for detecting a rotational speed of the transmission input shaft (111);
and a displacement sensor for detecting the amount of movement of the platen (131).
11. Testing device according to claim 10, characterized in that said detection module further comprises a temperature sensor pre-embedded in the inertia disc of said pressure plate (131) and/or said clutch (13).
12. The test rig according to any one of claims 9-11, wherein the test rig is a three motor transmission assembly test rig.
CN201711015051.1A 2017-10-25 2017-10-25 Method and device for testing torque transmission characteristics of clutch in transmission assembly Active CN109708873B (en)

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* Cited by examiner, † Cited by third party
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CN114295371B (en) * 2021-11-23 2023-09-19 中国北方车辆研究所 Comprehensive evaluation method for straight running efficiency performance of hydraulic mechanical comprehensive transmission device
CN114295372B (en) * 2021-12-07 2023-01-31 浙江奇碟汽车零部件有限公司 Method for detecting torsional characteristic of clutch disc assembly

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CN202066684U (en) * 2010-11-17 2011-12-07 罗晓晔 Comprehensive test stand for friction plates of clutches
CN102980767A (en) * 2012-12-24 2013-03-20 重庆理工大学 Test measurement device for dynamic transmission efficiency of actuator of AMT clutch
JP5245121B2 (en) * 2008-05-16 2013-07-24 地方独立行政法人北海道立総合研究機構 Body assembly mission simple performance test evaluation system
CN103900814A (en) * 2014-04-30 2014-07-02 湖北三环离合器有限公司 Multifunctional comprehensive test stand for dually-dry clutch
CN204831784U (en) * 2015-08-19 2015-12-02 福建工程学院 Performance test bench of clutch and derailleur
CN105606362A (en) * 2016-02-29 2016-05-25 天津大学 Rapid wear test system and rapid wear test method for AMT clutch plate
CN105628376A (en) * 2014-10-29 2016-06-01 广州汽车集团股份有限公司 Performance testing device of automobile clutch system
CN106338394A (en) * 2016-10-21 2017-01-18 合肥工业大学 Testing machine for testing displacement and transmission torque during clutch process of clutch
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Publication number Priority date Publication date Assignee Title
CN2128382Y (en) * 1992-07-03 1993-03-17 华南理工大学 Differential inertial type friction clutch performance test table
JP5245121B2 (en) * 2008-05-16 2013-07-24 地方独立行政法人北海道立総合研究機構 Body assembly mission simple performance test evaluation system
CN202066684U (en) * 2010-11-17 2011-12-07 罗晓晔 Comprehensive test stand for friction plates of clutches
CN102980767A (en) * 2012-12-24 2013-03-20 重庆理工大学 Test measurement device for dynamic transmission efficiency of actuator of AMT clutch
CN103900814A (en) * 2014-04-30 2014-07-02 湖北三环离合器有限公司 Multifunctional comprehensive test stand for dually-dry clutch
CN105628376A (en) * 2014-10-29 2016-06-01 广州汽车集团股份有限公司 Performance testing device of automobile clutch system
CN204831784U (en) * 2015-08-19 2015-12-02 福建工程学院 Performance test bench of clutch and derailleur
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CN106895974A (en) * 2017-04-01 2017-06-27 吉林东光集团有限公司 A kind of clutch thermal model method of testing

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