JPH0843259A - Method and machine for testing slip of automatic transmission - Google Patents

Abstract

PURPOSE:To test the slip of an automatic transmission with a small-sized facility. CONSTITUTION:The slip testing machine is constituted of driving means 2 and 3 which drive the input shaft A1 of an automatic transmission to be tested at a rotating speed corresponding to the sliding rotation of a friction plate F, fixing means 4 which fixes the output shaft A2 of the transmission A in an un-rotatable state, external oil pump 5 which is externally connected to the testing machine in parallel with the oil pump of the transmission A, and driving machine 6 which drives the pump 5 and can measure the slip of the transmission A by operating the transmission A while the output shaft A2 is fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slip test method for measuring friction characteristics and durability of a friction plate mounted in an automobile and arranged in an automatic transmission for transmitting engine power to an axle, and the test. The present invention relates to a slip tester used for.

[0002]

2. Description of the Related Art An automatic transmission has a built-in torque converter for transmitting the rotational power of an engine to a transmission through a fluid. However, in the torque converter section, transmission loss due to fluid slip is unavoidable. As shown in FIG. 3, a pump P which is an input element of the torque converter TC and a turbine T which is an output element of the torque converter TC are directly connected to each other via a friction plate F at a high speed, and a lockup clutch L for reducing a drive loss due to a slip of a fluid. Is usually provided. Such a lock-up clutch L not only reduces the transmission loss at the above high speed, but also
It has come to be used not only for reducing transmission loss at low speeds but also for absorbing rotational torque fluctuations due to engine pulsation, and lock-up slip control for that purpose has also come to be performed. As a result, the demands on the friction characteristics and durability of the friction plate have become more severe than in the case of conventional mere on / off control alone, and the importance of durability performance evaluation against it has increased.

On the other hand, the transmission mechanism of the automatic transmission is also provided with a large number of clutch and brake friction plates attached to the planetary gear unit in order to appropriately change the power transmission path in accordance with the gear stage. The slip test is also indispensable for evaluating the friction characteristics and durability of these friction plates.

The evaluation of the frictional characteristics and durability of various friction plates of such an automatic transmission has hitherto been carried out by using a large-scale test facility which can also evaluate the performance of the entire powertrain system. FIG. 4 shows a dynamometer which is an example of the configuration of such equipment. In the slip test using this equipment, the prime mover (engine or motor) 02
Also, the measurement is performed while generating a differential rotation (sliding rotation) between the input shaft A1 and the output shaft A2 of the automatic transmission A to be tested by the absorber (electric dynamometer) 04. The reason why such large-scale equipment is used is as follows.
That is, as shown in FIG. 3, the hydraulic pressure for operating the friction plate is obtained by driving the oil pump Q in the automatic transmission by the extension E of the torque converter case when the input shaft A1 is rotated. To be Therefore, in order to perform a slip test while operating the friction plate F, rotation (usually 1500 rpm or more) (N1) sufficient to generate sufficient hydraulic pressure for that purpose must always be applied to the input shaft A1 directly connected to the torque converter case. I won't. On the other hand, the slip rotation (ΔN) to be generated for the test is in the range of 0 to 500 rpm,
Since it is usually about 100 rpm, the load rotation (N2) on the output shaft A2 side for causing the rotation (ΔN) is N
2 = N1−ΔN = 1500 to 1000 rpm, which requires the rotor shown in FIG. 4, that is, the absorber 04.

[0005]

As described above, the slip rotation (Δ) of about 500 rpm at the maximum and usually about 100 rpm is given.
In order to obtain only N), a high-speed, high-torque prime mover 02 (generally having an output equivalent to that of a vehicle engine) is used on the drive side, and a high-speed, high-torque absorption capacity of the same on the load side. It is uneconomical to use the absorber 04. In addition, since the durability test of the friction plate F requires a long period of time, it is extremely effective to use other large-scale equipment such as a dynamometer for other tests during this period in terms of efficiency of use of the test equipment. There is a lot of waste.

In order to avoid such a problem, as far as the durability test of the friction plate of the lock-up clutch is concerned, a smaller test facility of the torque converter alone is assumed. Specifically, a smaller-capacity prime mover and absorber may be used, and these may be connected to the input / output shafts of the torque converter via a gear box. However, in the case of such a device, the hydraulic control device with a built-in automatic transmission cannot be used for controlling the clutch, and therefore a separate hydraulic unit for supplying the control hydraulic pressure to the torque converter is required. , A motor for driving it, a regulator for hydraulic control, a heater for raising the oil temperature according to the actual operating conditions, an oil reservoir tank, etc. must be provided, and the piping for connecting them must be connected. Due to the rotation, the amount of circulating oil is about 5 to 8 times the original amount of hydraulic oil, so not only does the hydraulic unit increase in size, but oil temperature rise and oil deterioration are far from the actual situation. Closely related judder (a phenomenon in which clutch stick and slip repeatedly occur) creates new problems such as difficulty in evaluating durability That.

Therefore, the present invention provides a simple slip test method for an automatic transmission and a slip tester capable of producing measurement conditions according to actual operating conditions without using the above-mentioned large equipment. The general purpose is to provide. A further specific object of the present invention is to further reduce the size of the prime mover of the slip tester. A further specific object of the present invention is to minimize the increase in the oil circulation oil amount due to the addition of the external oil pump.

[0008]

In order to achieve the above object, a slip test method for a friction plate of an automatic transmission according to the present invention is designed to fix the output shaft of the automatic transmission under test so that it cannot rotate. While driving the input shaft of the machine at a rotation speed equivalent to the sliding rotation of the friction plate,
It is characterized in that the hydraulic pressure necessary for operating the friction plate is measured from the outside while being supplied.

Next, the slip tester for an automatic transmission according to the present invention comprises drive means for driving the input shaft of the automatic transmission under test at a rotational speed corresponding to the slip rotation of the friction plate of the automatic transmission, and The output shaft of the automatic transmission is composed of a fixing means for non-rotatably fixing the output shaft of the automatic transmission, an external oil pump externally connected in parallel to the oil pump of the automatic transmission, and a drive unit of the external oil pump. The feature is that it enables measurement by fixed operation. The drive means may include a prime mover and a speed reducer that reduces the rotation of the prime mover to a rotational speed corresponding to the sliding rotation of the friction plate. The external oil pump may be branched and connected to an oil passage connecting the oil pump and the valve D via a spacer jig inserted between the case of the automatic transmission and the valve body.

[0010]

According to the above-described slip test method of the present invention, since the output shaft is fixed, the objects to be controlled are the speed and torque of the input shaft, the speed and torque of the output shaft, and the output shaft in the conventional slip test. In contrast to the combination of the sliding speed and the torque, the output shaft control is unnecessary, and the control can be simplified and the operability can be improved by that amount.

Next, according to the slip tester of the present invention, since the output shaft is simply fixed by the fixing means, the absorber and its controller, which have been required in the past, are not required, and the equipment cost is greatly reduced and the equipment size is reduced. Can be reduced. Further, since the slip rotation is directly used as the input rotation of the test automatic transmission, it is possible to significantly reduce the equipment cost by avoiding the use of a prime mover that generates higher rotation and torque than necessary. Furthermore, for adjusting the friction plate operating oil pressure, the hydraulic control device built into the automatic transmission under test, specifically a hydraulic regulator, etc. can be used as it is, as in the conventional case. It is sufficient to supply only the hydraulic pressure required for adjustment, and the size of the equipment, including its drive unit, is extremely small, so there is no particular increase in equipment cost or equipment size.

Further, since the rotation of the input shaft can be lowered as described above, each mechanical unit can be rigidly coupled without using a universal coupling, and since the rotation is low, forced lubrication of the bearing is unnecessary. There are also advantages. In addition, since the equipment scale is significantly reduced, a robust fixed surface plate is not required, and all machines can be placed on a common surface plate that can be relocated, making it possible to significantly reduce building costs and facilitate relocation. Become. In particular, when the configuration according to claim 3 is adopted, the torque amplification type prime mover by the speed reducer can be made smaller, and the equipment cost and the equipment size can be further reduced. Further, in the case of the structure according to claim 4, it is possible to minimize an increase in the amount of oil circulating oil due to the addition of the external oil pump, thereby making the operating state of the sample automatic transmission more actual operating state. Accurate measurement can be performed in close proximity.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a first embodiment in which the present invention is embodied in a slip test of an automatic transmission for an FR (front engine rear drive) vehicle. This device is provided on a common surface plate 1. The prime mover 2 supported and arranged, and the input shaft A1 of the sample automatic transmission A by reducing the rotation of the prime mover 2
And a fixing means 4 for fixing the output shaft A2 of the automatic transmission A. This device further includes an external oil pump 5 externally connected in parallel to the oil pump Q of the automatic transmission A (see FIG. 3 given as a conventional example), and a drive unit 6 for the external oil pump 5. In this example, a general-purpose AC 4-pole motor controlled by an inverter is used as the prime mover 2 so that a maximum of 1800 rpm can be obtained.
This rotation is decelerated to 1 / 3.6 to increase the torque and is also decelerated to the intended 500 rpm, and is connected to the input shaft A1 of the automatic transmission A via the shaft torque meter 7. On the other hand, the output shaft A2 of the automatic transmission A is fixed via the torsion shaft 8 to the drive shaft fixing base that constitutes the fixing means 4 in this example. Test automatic transmission A
Are fixed to the surface plate via a support base 9.

FIG. 2 shows the automatic transmission A of the external oil pump 5.
Of the oil pump Q is schematically shown, and the connecting means includes a pair of T-shaped oil passages 11 and 1 inside.
2 and a spacer jig 10 formed with a pipe 1 for connecting both oil passages to a discharge port 51 and a suction port 52 of an external oil pump 5.
It is composed of 3 and 14. And the spacer jig 1
0 indicates the vicinity of the position of the internal oil pump Q in the transmission case C of the automatic transmission A, and the case C
Is attached to the lower part of the engine and is inserted into a space formed by cutting off the connection with the valve body B covered with the oil pan R, thereby connecting the internal oil pump Q and the valve D of the hydraulic control device to the discharge oil passage. D and the suction oil passage S are branched and connected to the external oil pump 5 via the spacer jig 10.

In the slip tester thus constructed,
The rotation applied to the input shaft A1 of the installed automatic transmission A under test is slip rotation (ΔN) controlled by the inverter, and the rotation of the output shaft A2 is zero. In such a case, the friction plate F operating oil pressure (lock-up clutch operating oil pressure) supplied from the hydraulic control device built in the automatic transmission A is naturally not sufficient to operate the clutch normally at the above rotational speed. Therefore, in accordance with the present invention, the required operating hydraulic pressure is solved in parallel by supplying temperature-controlled torque converter oil from the external oil pump 5 equivalent to the internal oil pump Q. Since the amount of circulating oil is small, the above temperature adjustment may be as simple as heating the outer circumference of the pipe on the feeding side with a heater.

The operation control of each device at the time of measurement of this device is as follows.
Similar to the conventional one, the sequencer (not shown) is used. The sequencer adjusts the clutch hydraulic pressure by controlling the prime mover of the slip tester and the solenoid control of the hydraulic control device of the automatic transmission under test according to a pre-programmed automatic operation pattern, and automatically collects various measurement data.

The effects obtained by the slip tester of the above embodiment are listed below in comparison with those obtained by the conventional tester. (1) Since the output shaft is fixed, the absorption motor and its controller, which have been required in the past, are no longer required, and a large reduction in equipment cost and a reduction in equipment size can be achieved. (2) To adjust the clutch operating oil pressure, a hydraulic regulator or the like in the automatic transmission hydraulic control device used in the test can be used, so that the external hydraulic unit is sufficient with a simple configuration of only the pump and its drive unit. No extra cost or size increase. (3) Since the slip rotation (ΔN) itself is the input rotation,
The drive means can be a combination of a general-purpose motor controlled by an inverter and a speed reducer, which eliminates the need for a high-speed, high-torque prime mover that has been required in the past. (4) Since the rotation of the input shaft is low, each mechanical unit can be rigidly coupled without using a universal coupling.
Also, since the rotation is low, forced lubrication of the bearing is unnecessary. (5) Since the number of rotations of the device is low, a robust fixed surface plate is not required, and all machine units can be arranged on a reusable common surface plate, which makes it possible to reduce the building cost and facilitate the transfer. (6) An external oil pump equivalent to the internal oil pump of the automatic transmission is used, and a part of the original oil passage is cut off and a spacer jig is inserted there to form a connection with a small increase oil passage volume. The circulating oil amount does not differ greatly from that during actual driving. (7) In the case of the conventional slip tester, the control target is the combination of the speed and torque of the input shaft, the speed and torque of the output shaft, and the sliding speed and torque. However, in this example, the output shaft is fixed, so the output Axis control is not required, and control can be simplified and operability can be improved accordingly.

Next, FIG. 3 schematically shows a second embodiment in which the present invention is embodied in a form to be subjected to a slip test of an automatic transmission for an FF (front engine front drive) vehicle. In the case of this example, the output shaft A2 of the test automatic transmission A is
Since the drive shaft passes through the differential device, the fixing means 4a and 4b of the output shaft A2 naturally form a pair. The rest of the configuration and the operation and effect based on this configuration are substantially the same as those of the first embodiment, so the same components as those of the first embodiment are designated by the same reference numerals and will not be described. Replace.

The present invention has been described in detail based on the two embodiments by specifying the measurement object as the friction plate of the lock-up clutch, but the measurement object of the present invention is not limited to this, and as described above. Various friction plates arranged in each part of the automatic transmission can be applied as a measurement target, and the configuration of the invention itself can be variously modified within the scope of the matters described in the claims. It is possible.

[Brief description of drawings]

FIG. 1 is a conceptual diagram schematically showing a first embodiment in which the present invention is embodied in a slip test of an automatic transmission for FR vehicles.

FIG. 2 is a schematic diagram showing a connection mode of an external oil pump to an automatic transmission in the first embodiment.

FIG. 3 is a conceptual diagram schematically showing a second embodiment of the present invention embodied in a form used for a slip test of an automatic transmission for FF vehicles.

FIG. 4 is a conceptual diagram schematically showing the structure of a conventional torque converter.

FIG. 5 is a conceptual diagram showing a conventional slip tester for an automatic transmission for FR vehicles.

[Explanation of symbols]

 2 prime mover (driving means) 3 speed reducer (driving means) 4 fixing means 5 external oil pump 6 drive machine 10 spacer jig A test automatic transmission A1 input shaft A2 output shaft B valve body C transmission case F friction plate Q oil pump

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomio Ogiso 7, 141 Koizumi-cho, Tajimi-shi, Gifu Prefecture (72) Inventor Shoichi Yokoyama 39-6 Ikebata, Takara-cho, Chiryu-shi, Aichi Prefecture Room 202, Takara-cho Mansion

Claims (4)

[Claims] 1. In a slip test of a friction plate of an automatic transmission, an output shaft of the automatic transmission under test is fixed so as not to rotate, and an input shaft of the automatic transmission has a rotation speed corresponding to a slip rotation of the friction plate. A slip test method for an automatic transmission, characterized in that the hydraulic pressure required for operating the friction plate is supplied from the outside while being driven. 2. A drive means for driving the input shaft of the automatic transmission under test at a rotation speed corresponding to the sliding rotation of the friction plate of the automatic transmission, and a fixing means for fixing the output shaft of the automatic transmission so as not to rotate. Means and an external oil pump externally connected in parallel to the oil pump of the automatic transmission,
A slip tester for an automatic transmission, comprising a drive device for the external oil pump and enabling measurement by operation with the output shaft fixed. 3. The slip tester for an automatic transmission according to claim 2, wherein the drive means includes a prime mover and a speed reducer that reduces the rotation of the prime mover to a rotational speed corresponding to the sliding rotation of the friction plate. 4. The external oil pump is branched and connected to an oil passage connecting the oil pump and the valve D via a spacer jig inserted between the case of the automatic transmission and the valve body. 3. A slip tester for an automatic transmission according to 3.