JPH0443800Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is applicable to differential devices for vehicles,
For example, the present invention relates to a meshing test device that allows meshing testing of a device built into a transmission of a front-wheel drive automobile to be performed in an actual vehicle condition.

[Prior art]

Generally, when performing a meshing test on a differential device, it is necessary to test under a load condition close to that of the actual vehicle.
There is a method in which both output shafts of a differential device and a power shaft for applying a load are connected by gears, pulleys, etc., thereby synchronizing the rotation of the ring gear and the output shaft. In this case, there is a problem that it is difficult to achieve the above synchronization due to slippage of the belt, etc.

In addition, there is a method of locking the operating mechanism of the differential device to achieve the above-mentioned load condition.
There is a device that locks the operating mechanism in this way, as described in Japanese Utility Model Application Publication No. 56-132078. A jig was installed to stop the rotation of the pinion gear and extract the rotation of the gear case. However, the fixing jig described in this publication cannot be installed in the differential assembly state, and the differential device must be disassembled to install it.
Therefore, there was a problem that it was time consuming. Therefore, in order to eliminate the need for disassembling the above-mentioned differential device, conventionally, the output shaft was fitted and inserted into the spline of one side gear, and the tip of the output shaft was bifurcated to form a pinion shaft. There was a device in which the rotation of the gear case was taken out by engaging the gear case, but with this conventional device, although it was not necessary to disassemble the differential device, it was necessary to ensure sufficient strength at the tip of the output shaft. Therefore, there was a problem that durability was low when a load close to that of an actual vehicle was applied.

[Purpose of invention]

The present invention was developed in view of these conventional problems, and it is possible to test the engagement between the final gear and the ring gear under loads similar to those of the actual vehicle, does not require disassembly, and is highly durable for use in vehicles. The purpose of this invention is to provide a differential meshing test device.

[Structure of the idea]

The present invention is a meshing test device for vehicle differentials, which includes a driving force generating device that can be connected to an input shaft connected to the final gear of the differential device, and a driving force generating device that can be spline-fitted to one side gear. An absorption device, a fixed shaft spline-fitted to the other side gear to stop the rotation of the side gear, and a rotation take-out shaft connected to a gear case having a ring gear meshing with the final gear and taking out the rotation of the gear case. It is something.

As a result, in the present invention, when the driving force generating device is started, since the other side gear is fixed, one side gear rotates at twice the normal speed, and at this time, the driving force absorbing device causes the one side gear to rotate at twice the normal speed. By applying a predetermined amount of load to the side gear, it is possible to extract the rotation of the gear case in a state close to that of the actual vehicle.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Figures 1 and 2 are for explaining a vehicle differential engagement test device according to an embodiment of the present invention, and this device has a built-in differential device used in front-wheel drive vehicles. This is to test the meshing transmission error of the transmission, that is, the magnitude of the delay in the rotation of the output shaft relative to the rotation of the input shaft. First, the first part shows the overall configuration of this device.
In the figure, reference numeral 1 denotes a test stand on which a transmission W as a test object is placed and set, and approximately in the center of the test stand 1 is a connecting shaft 1a that can be connected to the primary shaft 9 of the transmission W. is provided, and an output shaft 2a of an input rotary encoder is flange-connected to this connecting shaft 1a.

The rotary encoder 2 is used to generate a predetermined number of pulses per rotation, and its input shaft 2b is connected to the output shaft 3b of a reducer 3a of the driving force generator 3, and the reducer A motor 3d that generates a driving force is connected to the input shaft 3c of the input shaft 3a via a flexible coupling 3e.

Further, an input shaft 6b of a reducer 6a of a driving force absorbing device 6 for absorbing the driving force from the motor 3d is located at the bottom of the test stand 1, and an output shaft 6c of the reducer 6a is provided with a driving force. A motor 6e for absorbing forces is connected via a flexible coupling 6d. In addition, two motors 3d and 6
The rotational speed of both motors e can be adjusted, so that an acceleration state can be reproduced by making the rotation of the motor 3d larger than that of the motor 6e, and a deceleration state can be reproduced by making the rotation of the motor 3d smaller than that of the motor 6e.

Next, in FIG. 2 showing in detail the differential device 8 portion of the transmission W, 11 is a secondary shaft, the final gear 11a of which meshes with a ring gear 13 bolted to the gear case 12. are doing. The left and right ends of the gear case 12 are rotatably supported by the differential case portion 10, and the pinion shaft 14, which is fixed through the gear case 12, has pinion gears 15a and 1 inside the gear case 12.
5b is rotatably mounted, and the pinion gear 15
a, 15b have left and right side gears 16a, 16b
are meshing.

The left side gear 16a has an output shaft 17.
A spline portion 17a formed at the front end of the gear case 12 is spline-fitted through the left axle hole 12a of the gear case 12, and a rear end 17b of the output shaft 17 is flanged to the input shaft 6b of the reducer 6a. .

Further, a fixed shaft 18 is attached to the right side gear 16b.
A spline portion 18a formed at the front end of the gear case 12 is spline-fitted through the right axle hole 12b of the gear case 12.The fixed shaft 18 has a smaller diameter than the output shaft 17, and the rear end 18b has a shaft fixing tool 19a. It is fixed to the support bracket 19 through the support bracket 19.

A cylindrical tension shaft 22 of a rotary output shaft 21 is rotatably fitted onto the fixed shaft 18 via a needle bearing 20, and a small diameter portion 22a of the tension shaft 22 has a diameter larger at the front end. A tapered portion 22b is formed, and this tapered portion 22b
is located in the right axle hole 12b of the gear case 12,
Further, the large diameter portion 22c of the tension shaft 22 is rotatably supported by the support bracket 19.
Further, a rotating body 25a of an output rotary encoder 25 is connected to a flange portion 22d formed on a large diameter portion 22c of this tension shaft 22, and a case 25b of the encoder 25 is connected to the support bracket 19.
The rotation prevention bracket 19b is integrally formed with the rotation prevention bracket 19b.

A cylindrical collet 23 is fitted into the small diameter portion 22a of the tension shaft 22 so as to be movable in the axial direction, and a large number of slits are formed in the tip 23a of the collet 23 in the axial direction. . Further, the rear end portion of the collet 23 and the large diameter portion 22c of the tension shaft 22 are threaded, and both threaded portions have a nut 24 formed with reverse lead threads at both ends. are screwed together.

Next, the effects will be explained.

In order to conduct a meshing test using the apparatus of this embodiment, the transmission W to be tested must first be set up. A connecting shaft 1a is connected to a primary shaft 9 which is an input shaft to a shaft device 8. In addition, in order to connect the output shaft 17, fixed shaft 18, and rotary take-out shaft 21 to the differential device 8, the output shaft 1
7 into the gear case 12 through the left axle hole 12a, and with the nut 24 loosened, the fixed shaft 18 and the rotating shaft 21 are inserted through the right axle hole 12b. Then, the spline portions 17a and 18a of the output shaft 17 and the fixed shaft 18 are spline-fitted to the left and right side gears 16a and 16b, respectively, and
The tip of the rotation take-out shaft 21 is located within the right axle hole 12b. And in this state Natsu 24
When the collet 23 is closed, the collet 23 moves forward and its tip 2
3a is expanded outward by the tapered portion 22b, thereby fixing the rotary take-out shaft 21 to the gear case 12, and the setting of the transmission W is completed.

Next, in order to measure the meshing transmission error of the transmission W, the motor 3d is started and controlled to a predetermined rotation speed.The rotation of the motor 3d is reduced by the reducer 3a, and the input rotary encoder 2 is input to the primary shaft 9 via
Ring gear 13 via secondary shaft 11
The rotation of the ring gear 13, that is, the rotation of the gear case 12, is taken out by the rotation take-off shaft 21 and transmitted to the output rotary encoder 25, and in this way, the rotation is transmitted from the input and output rotary encoders 2, 25 to the primary shaft 9, respectively. , a pulse waveform corresponding to the rotation of the gear case 12 is output.

At this time, the right side gear 16b is fixed to the fixed shaft 18.
Since its rotation is stopped by
7 rotates at twice the normal speed, and this output shaft 1
After the rotation of the motor 7 is decelerated by the speed reducer 6a, it is input to the motor 6e, which is controlled to a lower rotation speed than the motor 3d. A load corresponding to the braking force of the motor 6e acts on the output shaft 17 and thus the differential device 8, and by adjusting the braking force, a load state similar to that of the actual vehicle can be obtained. In this load condition similar to the actual vehicle, the input and output rotary encoders 2, 25
By comparing the pulse waveforms from , the meshing transmission characteristics of the present transmission W can be obtained, and it can be evaluated that the smaller the deviation between the two pulse waveforms, the smaller the transmission error.

In this way, in this embodiment, one of the side gears is fixed, a load is applied to the other, and in this state, the rotational states of the primary shaft 9 and gear case 12 are detected by the rotary encoders 2 and 25, so that the speed is close to that of the actual vehicle. The meshing transmission error can be measured under the
Moreover, in this case, there is no need to install a fixing jig inside the gear case 12 as in the conventional case, and work efficiency can be improved by not having to disassemble the test object. Since there is no need to make the part into a bifurcated shape, the durability of the device can be improved from this point of view.

In the above embodiment, the rotation of the gear case 12 is taken out from the fixed shaft 18 side, but it may be taken out from the output shaft 17 side.
Furthermore, in the above embodiments, the case of measuring the meshing transmission error was explained as an example of the meshing test, but the present invention can also be applied to various meshing tests that should be conducted in actual vehicle conditions, such as vibration and noise measurement. Applicable. Furthermore, it goes without saying that the present invention can be applied as an engagement tester for a differential device of a rear wheel drive vehicle.

[Effect of idea]

As described above, according to the meshing test device for a vehicle differential according to the present invention, the driving force generating device connectable to the input shaft connected to the final gear of the differential device; a driving force absorption device that can be connected to one side gear, and a fixed shaft that fixes the other side gear.
Since a rotation extraction shaft is provided to extract the rotation of the gear case that has a ring gear that meshes with the final gear, meshing tests can be conducted under load conditions close to those of the actual vehicle, and the workability and durability can be improved. be.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the overall configuration of a vehicle differential engagement test device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional plan view of the main parts thereof. 3...Driving force generation device, 6...Driving force absorption device, 8...Differential device, 9...Primary shaft (input shaft to differential device), 11a...Final gear, 12... ... Gear case, 13 ... Ring gear, 12b ... Axle hole, 16a ... Left side gear (one side gear), 16b ... Right side gear (other side gear), 18 ... Fixed shaft, 21 ... Rotation extraction shaft.

Claims (1)

[Scope of Claim for Utility Model Registration] A device for performing a meshing test between a final gear and a ring gear of a differential device, comprising a driving force generating device connectable to an input shaft connected to the final gear of the differential device; a driving force absorption device that can be spline-fitted with one side gear of the differential gear and that applies a load to the side gear and absorbs the driving force from the driving force generation device; and a driving force absorption device that can be spline-fitted with the other side gear. , a fixed shaft support for fixing the other side gear, and a rotation extraction shaft for extracting the rotation of the gear case, the tip of which can be externally clamped to the inner surface of the axle hole of the gear case, which has a ring gear that meshes with the final gear. A vehicle differential engagement test device comprising: