1. The method for testing the temperature of the clutch friction plate in the complete machine state of the transmission is characterized in that: the method comprises the following steps:

in the state of the parts, drilling an outer hole on a transmission shell at the position corresponding to the position of the clutch to be tested, and drilling an oil hole on an outer hub of the clutch to be tested;

after the transmission is assembled, the temperature sensor penetrates through the outer hole and the oil hole and then extends into the inner part of the outer hub of the clutch to be tested, and the temperature sensor is fixed;

mounting the transmission on a transmission loading test bed;

and starting an experiment, controlling the outer hub of the clutch to be tested to be fixed and the inner hub to operate, and measuring the temperature difference of the clutch under different working conditions.

2. The method for testing the temperature of the friction plate of the clutch under the complete state of the transmission as claimed in claim 1, is characterized in that: the oil hole is positioned at the inner tooth crest or the inner tooth bottom of the clutch outer hub.

3. The method for testing the temperature of the friction plate of the clutch under the complete state of the transmission as claimed in claim 1, is characterized in that: the temperature sensor is fixed to the transmission case by screws.

4. The method for testing the temperature of the friction plate of the clutch under the complete state of the transmission as claimed in claim 1, is characterized in that: and in the experimental process, the state of the friction plate after each working condition is operated is confirmed.

5. The method for testing the temperature of the friction plate of the clutch under the complete state of the transmission as claimed in claim 1, is characterized in that: also comprises

After the temperature difference values of the clutch under different working conditions are tested, processing data: fitting a clutch temperature difference value curve or curved surface corresponding to different slip differences and torques by utilizing a plurality of groups of torque, slip differences and temperature difference data to obtain a relational expression of the temperature difference, the torque and the slip differences;

fitting the temperature difference values under different working conditions according to the obtained relational expression of the temperature difference, the torque and the slipCalculating;

using the fitted temperature difference value according to the empirical temperature difference value Delta TObtaining the temperature difference of the friction plates in the clutch under different working conditionsWherein

=+ΔT，

Δ T is the empirical temperature difference;

is the fitting temperature difference;

the temperature difference of the friction plates inside the clutch.

6. The method for testing the temperature of the friction plate of the clutch under the complete state of the transmission as claimed in claim 5, is characterized in that: by varying the temperature of the friction plates inside the clutchComparing with the set limit temperature difference value, confirming the temperature difference value of the friction plate inside the clutchAnd whether the corresponding working condition is the working condition which can be borne by the clutch or not is judged so as to set the fault judgment condition of the transmission software.

7. The method for testing the temperature of the clutch friction plate in the complete state of the transmission as claimed in claim 6, wherein: the limit temperature difference value is not more than 300 degrees.

8. The method for testing the temperature of the friction plate of the clutch under the complete state of the transmission as claimed in claim 5, is characterized in that: the empirical temperature difference delta T is the difference between the temperature of the test position and the temperature inside the clutch, and the value range is 150-200 degrees.

Background

In the failure mode of the whole vehicle, the judgment conditions of the failure modes such as the sliding friction failure, the runaway failure and the like are all related to the slip of the clutch. In the design and development of the transmission, the state of a friction plate in the clutch needs to be known under different working conditions (different slip and different torque). Meanwhile, the judgment condition of the software fault mode is determined whether to be reasonable or not by combining the experimental result: whether the judgment condition is too severe exists, namely, the fault is reported by mistake under the working condition that the clutch cannot be damaged; or the judgment condition is too loose, namely when the friction plate of the clutch is damaged seriously and cannot work, the fault condition is not reported.

In order to reach the performance of the friction plate of the clutch, temperature tests are required to be carried out on the friction plate under different working conditions.

The existing clutch friction plate temperature test can only be carried out on a special clutch test bench generally, the experimental environment of the clutch in the whole transmission cannot be simulated actually, and the test result has deviation from the actual test result.

The existing testing method in the whole machine is to use a wireless temperature sensor, the wireless temperature sensor is arranged in a clutch friction plate set, and the external part of the wireless temperature sensor is connected with energy storage equipment such as a battery and the like, the volume of the equipment needs a certain space, and the equipment can only be used and tested at a clutch test stand or a position with larger peripheral space of a clutch in the whole machine; and a signal receiver is arranged outside the whole machine or the clutch and transmits the temperature signal to the display. The temperature sensor has the advantages of high cost, limited applicable conditions and poor universality.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method for testing the temperature of a clutch friction plate in the complete state of a transmission, which can meet the requirement of testing the temperature of the clutch in the complete state of the transmission, and has the advantages of low manufacturing cost and simple operation.

In order to solve the technical problems, the technical scheme of the invention is as follows: the method for testing the temperature of the clutch friction plate in the complete machine state of the transmission comprises the following steps:

in the state of the parts, drilling an outer hole on a transmission shell at the position corresponding to the position of the clutch to be tested, and drilling an oil hole on an outer hub of the clutch to be tested;

after the transmission is assembled, the temperature sensor penetrates through the outer hole and the oil hole and then extends into the inner part of the outer hub of the clutch to be tested, and the temperature sensor is fixed;

mounting the transmission on a transmission loading test bed;

and starting an experiment, controlling the outer hub of the clutch to be tested to be fixed and the inner hub to operate, and measuring the temperature difference of the clutch under different working conditions.

Preferably, the oil hole is located at an inner tooth crest or an inner tooth bottom of the clutch outer hub.

Preferably, the temperature sensor is fixed to the transmission housing by screws.

As an optimal technical scheme, in the experiment process, the state of the friction plate after operation under each working condition is confirmed.

As a preferable technical proposal, the method also comprises

After the temperature difference values of the clutch under different working conditions are tested, processing data: fitting a clutch temperature difference value curve or curved surface corresponding to different slip differences and torques by utilizing a plurality of groups of torque, slip differences and temperature difference data, and obtaining a relational expression of the temperature differences, the torque and the slip differences;

fitting the temperature difference values under different working conditions according to the obtained relational expression of the temperature difference, the torque and the slipAnd (4) calculating.

Using the fitted temperature difference value according to the empirical temperature difference value Delta TObtaining the temperature difference of the friction plates in the clutch under different working conditionsWherein

=+ΔT，

Δ T is the empirical temperature difference;

is the fitting temperature difference;

the temperature difference of the friction plates inside the clutch.

Preferably, the temperature difference of the friction plates inside the clutch is adjustedComparing with the set limit temperature difference value, confirming the temperature difference value of the friction plate inside the clutchAnd whether the corresponding working condition is the working condition which can be borne by the clutch or not is judged so as to set the fault judgment condition of the transmission software.

As a preferable technical scheme, the limit temperature difference value is not more than 300 degrees.

As a preferred technical solution, the empirical temperature difference Δ T is a difference between the temperature of the test position and the temperature inside the clutch, and the value range is 150-.

The test method is simple, convenient and feasible, and only a complete machine test stand is needed without a special clutch or friction plate test stand; compared with other measuring methods, such as a patch type and a wireless temperature measuring type, the measuring method is low in cost, and only the temperature sensor needs to be fixed on the transmission shell through punching, and the temperature sensor is inserted into the outer hub of the clutch through punching. The temperature of the clutch under different rotating speed differences of the clutch can be measured by the test method, the temperature has a great reference significance with the control of the sliding friction of the clutch in software, and the relevant conditions of clutch burning loss and the like caused by unreasonable parameter setting are avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a fitted surface plot of temperature difference, torque and slip for clutch plates.

Detailed Description

The method for testing the temperature of the clutch friction plate in the complete machine state of the transmission comprises the following steps:

s1: in the state of the parts, drilling an outer hole on a transmission shell at the position corresponding to the position of the clutch to be tested, and drilling an oil hole on an outer hub of the clutch to be tested;

the sizes of the outer hole and the oil hole are set according to the selected temperature sensor, the temperature sensor is of a structure that a thermistor is arranged in the shell, and the shell can be customized in terms of the appearances such as length, diameter and the like according to actual use requirements; the diameter of the oil hole can be 3-4mm, and the oil hole can be positioned at the inner tooth top or the inner tooth bottom of the clutch outer hub according to specific structures or sensors.

S2: after the transmission is assembled, the temperature sensor penetrates through the outer hole and the oil hole and then extends into the inner portion of the outer hub of the clutch to be tested, and the extending length is based on the fact that the operation of the inner hub is not influenced; then fixing the temperature sensor, wherein the temperature sensor can be fixed on the transmission shell through a screw;

s3: mounting the transmission on a transmission loading test bed;

according to a conventional experimental method, the transmission is arranged on one of a comprehensive performance test bed, an endurance test bed, a loading test bed and the like;

s4: starting the experiment;

controlling an outer hub of the clutch to be tested to be fixed, namely controlling an inner hub to operate, wherein the rotating speed is 0; testing a plurality of groups of different working conditions to obtain the temperature difference of the clutch friction plate under different torque and slip working conditions;

the rotating speed of the input shaft and the rotating speed of the output shaft can be monitored and adjusted according to test requirements, and the rotating speed of the inner hub can be calculated according to the transmission ratio, the rotating speed of the input shaft and the rotating speed of the output shaft.

Confirming the state of the friction plate after each working condition is operated, namely checking whether the friction plate has hot spots, whether the friction plate is burnt, and the like;

after the operation of each working condition is finished, disassembling the transmission, and checking whether the friction plate has a hot spot, is burnt or not; and according to actual experience, the speed changer can be disassembled after a plurality of groups of similar working conditions are tested, and whether hot spots exist on the friction plate or not, whether burning loss occurs or not and the like can be checked.

And S5, processing the data after testing the temperature difference values of the clutch under different working conditions:

and fitting a clutch temperature difference value curve corresponding to different slip values and torques by utilizing a plurality of groups of torque, slip values and temperature difference data, and obtaining a relational expression of the temperature difference, the torque and the slip values.

S6, fitting temperature difference values under different working conditions with the slip range of 0-1000rpm and the torque range of 0-380Nm according to the relational expression of the temperature difference, the torque and the slip obtained in the step S5And (4) calculating.

S7, according to the empirical temperature difference delta T, utilizing the fitting temperature difference value calculated in the step S6Obtaining the temperature difference of the friction plates in the clutch under different working conditionsWherein

=+ΔT，

In the test method, the temperature of the test position temperature sensor is measured, namely the fitting temperature difference value(ii) a The value range of delta T is 150-200 degrees;

is the fitting temperature difference;

the temperature difference of the friction plates inside the clutch is the temperature which actually influences the friction plates.

S8, adjusting the temperature difference of the friction plates inside the clutchComparing with the set limit temperature difference value, confirming the temperature difference value of the friction plate inside the clutchAnd whether the corresponding working condition is the working condition which can be borne by the clutch or not is judged so as to set the fault judgment condition of the transmission software.

Wherein, the limit temperature difference value is an empirical value, and generally, the limit temperature difference value is not more than 300 degrees.

Example one

Test A Clutch

S1: punching a position of a transmission shell near the clutch A to form an outer hole in a part state; and (4) punching an outer hub of the clutch A to form an oil hole.

S2: after the speed changer is assembled, the temperature sensor is fixed on the speed changer shell by using screws, and the temperature sensor can be aligned to an oil hole in the clutch outer hub after penetrating through the outer hole.

S3: the transmission was mounted on a transmission load test stand.

S4: starting the experiment; the outer hub of clutch a was controlled to be fixed, the temperature difference of the clutch plates at different slip and torque was tested and the data was recorded as in table 1.

TABLE 1

S5, fitting the relationship between the temperature difference value of the clutch, the slip and the torque by using EXCEL or MINTAB processing software according to the test data in the table 1, as shown in figure 1; meanwhile, the relation equation of the temperature difference, the torque and the slip is obtained as follows:

=0.35 slip +0.2704 torque-28.96

S6, fitting temperature difference values under different working conditions with the slip range of 0-1000rpm and the torque range of 0-380Nm according to the relation equation of the temperature difference, the torque and the slip obtained in the step S5And (4) calculating.

S7, according to the empirical temperature difference delta T, utilizing the fitting temperature difference value calculated in the step S6Obtaining the temperature difference of the friction plates in the clutch under different working conditions。

S8, adjusting the temperature difference of the friction plates in the clutchComparing with the set limit temperature difference value, confirming the temperature difference value of the friction plate inside the clutchAnd whether the corresponding working condition is the working condition which can be borne by the clutch or not is judged so as to set the fault judgment condition of the transmission software.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.