JPS6035846Y2 - Parallelism measuring device for gear ground - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for simply and accurately measuring the parallelism and thickness of a gear ground.

Many gear blanks are often lined up and cut at the same time to make gears.

Therefore, turning gear bases requires high precision, such as an error of 3/100 mm or less in parallelism on a plane perpendicular to the axle direction.

If even one gear with defective parallelism is mixed in with an error greater than this and repeated cutting is performed, all of the finished gears will often be defective.

Therefore, since the parallelism of the gear ground is important and high precision is always required, a considerable degree of precision is also required for the measuring device.

Conventionally, an eccentricity tester has been used to measure the parallelism of gear ground.

However, this device is expensive and requires complicated measurement work such as attaching the gear base to the device and measuring the thickness with a micro gauge beforehand.

Therefore, it had drawbacks such as poor efficiency.

The purpose of this invention is to provide a parallelism measuring device that is highly accurate, inexpensive, highly efficient, easy to measure, and has good durability.
This eliminates all the drawbacks of the conventional devices mentioned above.

The structural features of this invention include a turntable that is supported on a rotating shaft with good surface smoothness and no rotational wobble so that it can rotate on an almost horizontal plane, and a support that is attached to the side of the turntable for vertical and horizontal movement. The gear ground guide bar and dial gauge are provided.

Such a device for measuring parallelism of a gear base has never been seen before, and in particular, it was thought that there was almost no possibility of measuring the parallelism of a gear base by placing it on a turntable.

This is because it is difficult to stably place a gear base in the center of a rotating turntable.For example, if the turntable is made of magnets, it is certainly possible to stably place a gear base, but the turntable The adhesion of cutting chips, iron powder, etc. is extremely large, making it impossible to ensure accuracy of 1/100 to 3/10.

For these reasons, it seems that no gear ground parallelism measuring device having the structure of the present invention has been developed.

The parallelism measuring device of the present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a plan view of the apparatus of the present invention, FIG. 2 is a front view, and FIG. 3 is an enlarged sectional view taken along line A-A in FIG.

This device has a motor chamber 2 installed on the side of the main body casing 1.
A worm 4 is attached to the rotating shaft of the motor 3, and a worm wheel 7 provided below the rotating shaft 6 that supports the turntable 5 engages with the worm 4. ing.

In this case, the rotating shaft 6 is rotatable by a bearing 8 fixed at its upper part between the main body casing 1 and by a thrust bearing 9 provided between the casing 1 and the worm wheel 7 at a lower part of the central part. It is installed.

The thrust bearing 9 between the casing 1 and the worm wheel 7 is connected by a nut 10 fitted into a threaded portion at the lower end of the rotating shaft 6.
Tighten and secure.

These operations can be performed by opening the back cover 11 provided at the bottom of the casing 1.

In addition, the power may be transmitted from the motor to the turntable by spur gear transmission, or a reduction motor may be directly connected.

The rotation speed of the turntable is usually 20 to 5 Qrpm.

On the other hand, on the side of the turntable 5, a support 12 is fixed to a support support fixing portion 13 provided on the outer wall of the casing 1 and stands upright.

For this column 12, a gauge support rod 14 is attached to a holder 15.
Further, the dial gauge 16 is attached to the fixture 1 with respect to the gauge support rod 14.
7, it is fixed so that it can move vertically and horizontally.

The dial gauge 16 attached to the pillar in this manner is, for example, a TM-110 type manufactured by Chiklock Co., Ltd., 0.0l-rr.
L/m.

An inexpensive general measuring dial gauge with a scale and measurement range of about ±0-50-100 can be used satisfactorily.

The most important thing here is that the turntable 5 has good smoothness and no rotational wobbling.

To this end, a bearing 8 and a thrust bearing 9 are used together on the rotating shaft 6 of the turntable 5 to prevent rattling of the rotating shaft, and the surface of the turntable 5 is ground and polished to ±0.003 mm or less using a rotary single-plane polisher. There is.

A gear base guide bar 18 is further provided on the turntable 5 at an interval such that the gear base guide bar 18 does not slide on the surface thereof.

This gear base guide bar 18 has its base attached to the support post fixing part 13.
The guide bar fixing device 19 provided near the support column 12 is fixed with a screw 20 so as to be movable vertically and horizontally.

The gear ground guide bar 18 is best if it is bent in an F-shape near the center, and it is best to hold the gear ground 21 in the middle of the turntable 5, but a bar that is curved at the center can also be used.

In FIGS. 1 and 2, the auxiliary guide bar fixture 23 is provided so as to widen toward the gear ground guide bar 18.

Of course, it is possible to stably hold the gear base 21 on the turntable 5 using only the gear base guide bar 18.
By providing the auxiliary guide bar 22 in this way, the gear base 21 is quickly fitted into the turntable 5.

This is due to the action of the gear ground guide bar 18.
The center of the gear base approaches the rotation center of the turntable, and then the gear base comes into contact with the auxiliary guide bar 22, and the center of the gear base is slightly closer to the narrow side of both guide bars than the center of the turntable. This is because the gear ground is stabilized in contact with both guide bars.

The method of using this device is as follows.

That is, when the turntable 5 is rotated by carrying it to a suitable place by the handle 24 and standing still, inserting the plug 25 into the outlet and rotating the motor 3.

Of course, if it is desired to adjust the rotational speed appropriately at this time, a variable speed motor is used for the motor 3, as is generally done in this type of device.

When the gear base 21 is placed on the turntable, the gear base moves toward the center along the gear base guide bar 18, and also comes into contact with the auxiliary guide bar 22 provided at the wider end, so that the center of the gear base moves toward the center. It rotates stably in the middle of the turntable, which is slightly beyond the center of rotation of the turntable.

Then, by adjusting the height of the dial gauge 16 appropriately using the holder 15 or the fixture 17 and placing the measuring end 26 of the dial gauge 16 on the gear base 21, it is possible to rotate the dial gauge 16 by 1/4 to 1/2 rotation of the gear base 21. This allows the thickness and parallelism to be measured immediately.

From now on, when measuring the same type of gear base, the parallelism and thickness can be measured simultaneously by simply placing it on the turntable 5.

In other words, with conventional measuring instruments, measurements are performed by inserting the gear base into the test bar, supporting and stopping it, and then applying a dial gauge, etc., and removing the gear base from the test bar each time the measurement is completed, which is a very troublesome process. However,
With this device, it is only necessary to place the gear base on the turntable, and when the measurement is completed, the simple operation of picking up the gear base from the turntable is sufficient.

Of course, since the structure is simple, it can be provided at low cost, has almost no failures, and can perform stable and accurate measurements for many years.

[Brief explanation of drawings]

Figure 1 is a plan view, Figure 2 is a front view, Figure 3 is A of Figure 1.
- It is an enlarged sectional view of part A.

Claims (1)

[Scope of utility model registration request] A turntable 5 with good surface smoothness and no rotational wobbling, and a gear base guide bar 18, an auxiliary guide bar 22, and a dial gauge 16 that are supported so as to be movable vertically and horizontally on a post fixing part 13 provided on the side of the turntable 5 are provided. The gear base guide bar 18 and the auxiliary guide bar 22 are installed on the turntable so as to spread out at a height that is within the thickness of the gear base, and the gear base follows the gear base guide bar 18 toward the center of the turntable. A device for measuring parallelism of a gear base, which is adjusted to a position where the gear base rotates stably together with a turntable.