JP3051620B2 - Load test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load test apparatus for inspecting the rotational state of a test object under a load.

[0002]

2. Description of the Related Art A device under test, for example, a transmission for a vehicle, includes a main shaft, a counter shaft, and a final gear, and various gears are assembled to the main shaft and the counter shaft.

[0003] In this case, due to the accuracy of the various gears themselves and the degree of the load acting on the gears in a state where the gears are assembled, a problem such as generation of noise during use occurs. For this reason, it is necessary to test the meshing state of the gears. A conventional dynamo device is used (hereinafter referred to as Conventional Example 1), and the load is set with the gear to be inspected meshed with the master gear. (Hereinafter referred to as Conventional Example 2) and Japanese Patent Application Laid-Open No. 56-133.
As disclosed in Japanese Patent No. 643, an apparatus for transmitting the rotation of a drive source to a test product via a torque converter (hereinafter, referred to as Conventional Example 3) is known.

[0004]

However, in the above-mentioned prior art 1, the size of the device itself is increased, and at the time of inspection, after the main shaft, the counter shaft and the final gear are assembled to the transmission case, the transmission case is mounted on the device. The transmission case is removed from the apparatus, disassembled into parts, and each gear is inspected. Therefore, the work becomes considerably complicated,
It has been pointed out that efficient inspection work cannot be performed.

In the above-mentioned conventional examples 2 and 3,
It does not check the quality in the state close to the transmission actually mounted on the engine, and even if the inspection result is good, there is a risk that problems such as noise may occur when mounting this transmission, improving the efficiency of inspection work and It is difficult to improve certainty.

An object of the present invention is to solve this kind of problem. Inspection of a device under test can be performed accurately and quickly, and downsizing of the entire apparatus and simplification of the structure can be easily performed. It is an object of the present invention to provide a simple load test device.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for rotating an input shaft of a device under test and applying a load to an output shaft of the device under test. A load test device for testing a rotating state of a product,
A forward and reverse drive motor connected to the input shaft side, and a torque converter connected to the output shaft side and electrically converting torque acting on the output shaft via a strain gauge, Rotating torque generating means for variably applying a load to the torque converter using a braking force by oil, the rotating torque generating means being connected to the torque converter , Connected to the tank
A closed oil circuit by communicating with the first and second passages
And a hydraulic pump disposed in the first and second passages.
That a positive diversion flow control means and reverse flow control means provided with a, the forward rotation flow control means, the drive
The first passage which is on the oil discharge side when the motor for normal rotation
To reduce the oil flow resistance of the first passage to the second passage.
Make the drive motor larger than the oil flow resistance of the passage
Providing a first flow control valve capable of applying an arbitrary rotational load;
The reverse rotation flow control means is configured to reverse the driving motor.
The second passage on the oil discharge side when
The oil flow resistance of the second passage is reduced by the oil flow resistance of the first passage.
Any larger rotational load on the drive motor
A second flow control valve capable of imparting provided, the first and
The drive is performed by adjusting the opening of the second flow control valve.
Wherein the grantable to be Rukoto any rotational load linearly to use motor.

[0008]

Further, the device under test is a transmission, and the driving motor is detachably connected to the main shaft as the input shaft, and is driven to rotate from the main shaft via a counter shaft. It is preferable that the torque converter is detachably connected to a final gear that is an output shaft.

[0010]

In the load test apparatus according to the present invention, the input shaft of the device under test is rotated under the action of the drive motor, and the output shaft of the device under test is rotated by the rotating torque generating means via the torque converter. The load is variably applied to the side, and the quality of the test object is determined. For this reason, a load corresponding to the torque generated during actual use can be accurately applied to the output shaft side, and the work of judging the quality of the DUT is performed with high accuracy.

Further, when the device under test is a transmission, a drive motor is connected to the main shaft while the main shaft, the counter shaft and the final gear, which are the components of the transmission, are integrated. A rotating torque generating means is connected to the final gear via a torque converter. Therefore, the quality of the transmission can be determined by approximating the transmission to the mounted state, and the inspection work can be easily and reliably performed.

[0012]

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A load test apparatus according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1 and FIG.
Shows a load test apparatus according to the present embodiment. The load test apparatus 10 includes a drive motor 16 connected to a main shaft (input shaft) 14 of a transmission (device under test) 12, and a final gear (rotationally driven from the main shaft 14 via a counter shaft 18). Output shaft)
And a hydraulic pump (rotary torque generating means) for applying a load to the torque converter 22 in a variable manner using a back pressure of oil.
24.

A drive motor 16 is mounted on a base 26 via a slide base 28 so as to be adjustable in position. The drive motor 16 is connected to a changeover switch 30 (see FIG. 3).
Forward and reverse rotation is possible under the action of. The main shaft 14 is connected to a rotating shaft 32 extending from the driving motor 16 via a coupling member 34, and the torque converter 2 is connected to the final gear 20 via a coupling member 36.
The two first shafts 38 are connected. The second shaft 40 of the torque converter 22, hydraulic Pont via the coupling member 42
Rotary shaft 24a of the flop 24 is connected. First and second axes
38 and 40 are integrally formed and have a strain cage
(Not shown), which is generated according to the torque
Torsion (surface shear stress) into electric quantity (voltage)
It is configured to be taken out.

As shown in FIG. 3, the hydraulic circuit of the hydraulic pump 24 has an oil tank 44,
The flow control means 46 for normal rotation and the flow control means 48 for reverse rotation for controlling the flow of oil naturally falling from the oil pump 4 and applying a predetermined rotational load to the hydraulic pump 24 are provided from the oil tank 44 to the hydraulic pump 24. It is disposed on the way of the communicating passages 50 and 52.

The forward flow control means 46 and the reverse flow control means 48 similarly include check valves 54 and 56, a relief valve 58, and a flow control valve 60, respectively, and operate the torque converter 22 during forward / reverse rotation. Thus, the load applied to the final gear 20 can be changed linearly. The load applied to the torque converter 22 is displayed on a torque display meter 62.

Next, the operation of the load test apparatus 10 configured as described above will be described.

First, the transmission 1 is placed on the base 26.
2 is placed. The transmission 12 is similar to a state in which the transmission 12 is actually mounted on an engine. A drive motor 16 is connected to the main shaft 14 via a coupling member 34 corresponding to the engine side, and a torque converter A first shaft 38 is connected to the final gear 20 via a coupling member 36 corresponding to the load side (driven side).

Next, when the drive motor 16 is driven in a predetermined direction (for example, the normal rotation direction) to rotate the rotary shaft 32, the main shaft 1 is driven through the coupling member 34.
4 rotates, and the final gear 20 is further rotated via the counter shaft 18. Therefore, the meshing state of the respective gears constituting the transmission 12 is confirmed, and the quality of the transmission 12 is determined.

At this time, a predetermined rotational load is generated on the final gear 20 by the braking force of the oil of the hydraulic pump 24 acting thereon. For this reason, the final gear 20 side is provided with a rotational load corresponding to the torque generated via wheels or the like during actual running, and the effect that the quality judgment of the transmission 12 is performed in a state similar to that at the time of mounting is achieved. can get. In particular, by adjusting the forward flow control means 46 and the reverse flow control means 48, the oil tank 4
Just by controlling the flow of oil that falls naturally from 4,
The rotational load applied to the final gear 20 can be changed linearly, and the inspection of the transmission 12 can be performed with a simple configuration and with high accuracy.
Specifically, at the time of reverse rotation, the oil outlet path (second copies
By flow path control valve 60 constituting the reverse flow control means 48 provided on the road) 52 is squeezed, it the oil introduction side
Of the oil flowing through the passage (first passage) 50
The flow resistance of oil flowing through the passage 52 on the discharge side is large.
Ku is controlled, any rotational load is applied to the drive motor 16. On the other hand, during normal rotation, the passage 50 on the oil discharge side
The flow control valve 60 constituting the provided normal rotation flow control means 46 is throttled, so that the passage 52 on the oil introduction side is reduced.
The passage 5 which is closer to the oil discharge side than the flow resistance of the oil flowing through the passage 5
The flow resistance of the oil flowing through zero is greatly controlled, and an arbitrary rotational load is applied to the drive motor 16. The rotational load of the drive motor 16 can be changed linearly by adjusting the opening of each of the flow control valves 60.

Moreover, in this embodiment, the transmission 12 is mounted on the base 26 in a manner similar to the mounted state. Therefore, after the transmission 12 is inspected by the load test apparatus 10, the transmission 12 is mounted on the vehicle body in substantially the same state, so that the disassembly and assembly work as in the related art becomes unnecessary, and the number of work steps is reduced at once. There is an advantage that overall efficiency can be easily achieved.

[0023]

According to the load test apparatus of the present invention, the following effects can be obtained.

The input shaft of the device under test is rotated under the action of the drive motor, and a load is variably applied to the output shaft of the device under test from the rotating torque generating means via the torque converter. In addition, a load corresponding to the torque generated during actual use can be accurately applied to the output shaft side, and the work of judging the quality of the DUT can be performed with high accuracy.

Furthermore, if the device under test is a transmission, the quality of the transmission is determined by assembling the main shaft, counter shaft, and final gear, which are the components of the transmission, in an integrated manner, that is, by approximating the mounted state. Inspection work can be performed easily and reliably.

Also, as a rotational torque generating means, a hydraulic pump is used.
The use of a pump makes it possible to simplify the configuration and effectively prevent a rise in equipment costs, and to precisely change the load with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a load test device according to an embodiment of the present invention.

FIG. 2 is a plan view of the load test device.

FIG. 3 is a schematic configuration diagram showing a hydraulic circuit of the load test device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Load test apparatus 12 ... Transmission 14 ... Main shaft 16 ... Drive motor 18 ... Counter shaft 20 ... Final gear 22 ... Torque converter 24 ... Hydraulic port
Pumps 34, 36, 42 ... Coupling members 38, 40 ...
Shaft 44 ... Oil tank 46, 48 ...
Flow control means

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01M 13/02

Claims (2)

(57) [Claims] 1. A load test apparatus for rotating an input shaft side of a DUT and applying a load to an output shaft side of the DUT to test a rotation state of the DUT. A drive motor connected to the input shaft and capable of normal rotation and reverse rotation, a torque converter connected to the output shaft and electrically converting torque acting on the output shaft through a strain gauge; and A rotational torque generating means for variably applying a load to the torque converter by using a braking force of the rotational torque generating means, wherein the rotational torque generating means is connected to the torque converter and an oil tank. First and second communicating with
A hydraulic pump which constitutes a closed oil circuit in communication with the passage, and the forward rotation flow control means and reverse flow control device disposed in the first and second passage, provided with a, the forward rotation flow control means Means that the drive motor rotates forward
When the first passage on the oil discharge side is throttled,
The oil flow resistance of the first passage is reduced by the oil flow resistance of the second passage.
Any larger rotational load on the drive motor
A first flow control valve capable of providing a reverse rotation, and the reverse flow control means controls the reverse of the driving motor.
The second passage on the oil discharge side when
The oil flow resistance of the second passage is reduced by the oil flow resistance of the first passage.
Any larger rotational load on the drive motor
Providing a second flow control valve capable of providing pressure, and adjusting the opening of the first and second flow control valves
Linearly applies an arbitrary rotational load to the drive motor.
Given possible load test apparatus according to claim to Rukoto. 2. The apparatus according to claim 1, wherein the device under test is a transmission, and the drive motor is detachably connected to a main shaft as the input shaft, and the counter shaft is connected to the main shaft. A load test apparatus, wherein the torque converter is detachably connected to a final gear, which is an output shaft that is rotationally driven through the torque converter.