JPH07128191A - Load test equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To accurately and quickly inspect a device under test, and to easily downsize the entire device and simplify the structure. [Structure] Main shaft 14 of transmission 12
And a torque converter 22 connected to a final gear 20 that is rotationally driven from the main shaft 14 via a counter shaft 18,
And a hydraulic motor 24 for variably applying a load to the torque converter 22 using back pressure of oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load test device for inspecting the rotating state of a load of a DUT.

[0002]

2. Description of the Related Art An article to be tested, for example, a vehicle transmission is provided with a main shaft, a counter shaft and a final gear, and various gears are attached to the main shaft and the counter shaft.

In this case, problems such as noise are generated during use due to the accuracy of the various gears themselves and the extent of the load acting on the gears when assembled as a transmission. Therefore, it is necessary to test the meshing state of the gears, which uses a dynamo device in the past (hereinafter referred to as Conventional Example 1), and the load is applied in a state where the gear to be inspected is meshed with the master gear as a reference. The quality of the inspected gear is inspected (hereinafter referred to as Conventional Example 2), and JP-A-56-133.
As disclosed in Japanese Patent No. 643, there is known an apparatus (hereinafter referred to as Conventional Example 3) for transmitting the rotation of a drive source to a test article via a torque converter.

[0004]

However, in the above-mentioned conventional example 1, the device itself becomes large, and at the time of inspection, after mounting the main shaft, the counter shaft and the final gear on the transmission case, the transmission case is mounted on the device. The gears are worn and inspected, the transmission case is removed from the device, and each component is disassembled to inspect each gear. Therefore, the work becomes considerably complicated,
It has been pointed out that efficient inspection work cannot be performed.

Further, in the above-mentioned conventional examples 2 and 3,
The quality is not checked in a state close to the transmission actually installed in the engine, and even if the inspection result is good, noise such as noise may occur during mounting of the transmission, improving the efficiency of inspection work and It is difficult to improve certainty.

The present invention is intended to solve this type of problem, and it is possible to accurately and promptly inspect a device under test and to easily downsize the entire apparatus and simplify the structure. To provide a simple load test device.

[0007]

In order to achieve the above object, the present invention rotates the input shaft side of the DUT and applies a load to the output shaft side of the DUT to be tested. A load test device for testing the rotation state of a product,
A drive motor connected to the input shaft side, a torque converter connected to the output shaft side, and a rotation for applying a load to the torque converter variably by using a braking force of oil. And a torque generating means.

Further, it is preferable that the rotating torque generating means includes a deenergized hydraulic motor.

Furthermore, the DUT is a transmission, the drive motor is detachably connected to a main shaft which is the input shaft, and the main shaft is rotationally driven through 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 testing apparatus according to the present invention described above, the input shaft of the DUT is rotated under the action of the drive motor, and the output shaft of the DUT is output from the rotating torque generating means through the torque converter. The load is variably applied to the side, and the quality of the DUT is judged. Therefore, it is possible to accurately apply a load corresponding to the torque generated during actual use to the output shaft side, and the quality of work for the DUT can be determined with high accuracy.

Further, if the DUT is a transmission, a drive motor is connected to the main shaft with the main shaft, the counter shaft, and the final gear, which are the components of the transmission, being integrally assembled. A rotary torque generating means is connected to the final gear via a torque converter. Therefore, the quality of the transmission can be judged by approximating the transmission to the mounted state, and the inspection work can be performed easily and surely.

If a deenergized hydraulic motor is used as the rotating torque generating means, the structure can be simplified and the increase in equipment cost can be effectively prevented, and the load can be simplified. Can be changed accurately.

[0013]

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

1 and 2, reference numeral 10
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 (product under test) 12, and a final gear (rotatably driven from the main shaft 14 via a counter shaft 18). Output shaft)
A torque converter 22 connected to 20 and a deenergized hydraulic motor (rotating torque generating means) 24 for variably applying a load to the torque converter 22 using back pressure from oil. Prepare

A drive motor 16 is mounted on a base 26 via a slide base 28 so that the position of the drive motor 16 can be adjusted freely. The drive motor 16 has a changeover switch 30 (see FIG. 3).
It is possible to rotate forward and reverse under the action of. The main shaft 14 is coupled to the rotary shaft 32 extending from the drive motor 16 via the coupling member 34, and the torque converter 2 is coupled to the final gear 20 via the coupling member 36.
Two first shafts 38 are connected. The second shaft 40 of the torque converter 22 is connected to the rotary shaft 24a of the hydraulic motor 24 via the coupling member 42.

As shown in FIG. 3, the hydraulic circuit of the hydraulic motor 24 includes an oil tank 44.
The normal rotation flow rate control means 46 and the reverse rotation flow rate control means 48 for controlling the flow of the oil that naturally falls from 4 to apply a predetermined rotational load to the hydraulic motor 24 in the deenergized state,
It is arranged on the way of passages 50 and 52 communicating with the hydraulic motor 24 from the oil tank 44.

The forward rotation flow rate control means 46 and the reverse rotation flow rate control means 48 similarly include check valves 54 and 56, a relief valve 58, and a flow rate adjusting valve 60, respectively, and the torque converter 22 is provided at the time of forward rotation and reverse rotation. The load applied to the final gear 20 can be linearly changed via the above. The load applied to the torque converter 22 is displayed on the torque display meter 62.

Next, the operation of the load testing apparatus 10 thus constructed will be described.

First, the transmission 1 is mounted on the base 26.
2 is placed. The transmission 12 is similar to a state in which it is actually mounted on an engine. The drive motor 16 is connected to the main shaft 14 via a coupling member 34 corresponding to the engine side, and the torque converter is provided. The first shaft 38 of 22 is connected to the final gear 20 via the 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 passed through the coupling member 34.
4 rotates, and further the final gear 20 rotates via the counter shaft 18. Therefore, the meshing state of the gears forming the transmission 12 is confirmed, and the quality of the transmission 12 is determined.

At this time, the braking force of the deenergized oil of the hydraulic motor 24 acts on the final gear 20 to generate a predetermined rotational load. Therefore, the final gear 20 side is provided with a rotational load corresponding to the torque generated through the wheels or the like during actual traveling, and the quality of the transmission 12 is judged to be similar to that at the time of mounting. can get. In particular, the rotational load applied to the final gear 20 is linearly changed only by controlling the flow rate of the oil that naturally drops from the oil tank 44 by adjusting the flow rate control means 46 for normal rotation and the flow rate control means 48 for reverse rotation. Therefore, the inspection work of the transmission 12 can be performed with a simple configuration and with high accuracy.

Moreover, in this embodiment, the transmission 12 is mounted on the base 26 so as to approximate the mounted state. Therefore, since the transmission 12 is inspected by the load test apparatus 10 and mounted on the vehicle body in substantially the same state, the disassembling and assembling work as in the conventional case is unnecessary, and the work man-hours are reduced at once. There is an advantage that the overall efficiency is easily achieved.

[0023]

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

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

Further, if the DUT is a transmission, the main shaft, the counter shaft, and the final gear, which are the components of the transmission, are integrally assembled, that is, the mounted state is approximated to judge the quality. The inspection work can be performed easily and surely.

Further, if a deenergized hydraulic motor is used as the rotating torque generating means, the structure can be simplified and the rise in equipment cost can be effectively prevented, and the load can be simplified. Can be changed accurately.

[Brief description of drawings]

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

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

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

[Explanation of symbols]

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

Claims (3)

[Claims] 1. A load test apparatus for rotating the input shaft side of a device under test and applying a load to the output shaft side of the device under test to test the rotating state of the device under test. A drive motor connected to the input shaft side, a torque converter connected to the output shaft side, and a rotation torque for variably applying a load to the torque converter by using a braking force of oil. A load test apparatus comprising: a generating unit. 2. The load test apparatus according to claim 1, wherein the rotational torque generating means includes a deenergized hydraulic motor. 3. The apparatus according to claim 1, wherein the DUT is a transmission, the drive motor is detachably connected to a main shaft that is the input shaft, and A load test apparatus in which the torque converter is detachably connected to a final gear that is an output shaft that is rotationally driven via a counter shaft.