JP2002310643A - Gear angle measuring method and gear angle inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear angle measuring method and a gear angle inspection device for measuring the error angle of a measured gear, determining whether the error angle is permissible or not, and computing the error angle. SOLUTION: This gear angle inspection device is equipped with a work holder 2, a rack gear 3, linear guides 4 and 4, an electric micrometer 5, a determination means 7, and an amplifier 8 for measurement; the measured gear 1 is fixed to the work holder 2, and the rack gear 3 is moved along the linear guides 4 and 4 toward the measured gear; and with the rack gear 3 meshing with the measured gear 1, displacement of the measured gear 1 is detected by the micrometer 5. The error angle of the measured gear 1 is measured from the difference between a reference displacement of a master gear 6 and the displacement of the measured gear 1. The determination means 7 decides on the quality of the error angle of the measured gear 1, and the amplifier 8 for measurement computes the error angle of the measured gear 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear angle measuring method and a gear for automatically measuring and inspecting a circumferential error angle between a tooth and an arbitrary point in the radial direction passing through the center of a gear to be measured. The present invention relates to an angle inspection device.

[0002]

2. Description of the Related Art Conventionally, dents, burrs,
A gear inspection device for inspecting tooth groove runout and the like is proposed in Japanese Utility Model Laid-Open Publication No. 3-199144. In addition, the position of the measurement gear is fixed, and the position of the shaft of the parent gear that rotates while meshing with the measurement gear is fixed. From the measured value of the longitudinal movement distance, the measurement gear Over
Ball Diameter (hereinafter referred to as OBD), a gear tester for measuring tooth runout and dents, is disclosed in Japanese Utility Model Application Laid-Open No. Hei 5-7174.
No. 7 is proposed.

Further, when measuring the circumferential angle between an arbitrary point in the radial direction passing through the center of the gear to be measured and the tooth, the angle can be measured using a three-dimensional measuring device. Alternatively, the angle is measured by making a score line using a goniometer.

[0004]

SUMMARY OF THE INVENTION
No. 19944 discloses that when a master gear meshes with a gear tooth, a work rotating and gripping mechanism rotates the gear, and the master gear also rotates while meshing with the gear, so that a flaw such as a burr and a dent of the gear and a tooth are formed. Inspection of groove runout,
Further, in the device disclosed in Japanese Utility Model Application Laid-Open No. 5-71747, when the parent gear meshes with the measurement gear, the rotating mechanism rotates the parent gear, and the measurement gear rotates while meshing with the parent gear, and the rotation of the parent gear before and after the axis thereof The OBD, tooth runout, and dents of the measuring gear were measured from the measured value of the moving distance.

Further, in the case of using a three-dimensional measuring device, the measuring time of the angle of the gear to be measured by the three-dimensional measuring device is long, the cost is high, and the three-dimensional measurement cannot be performed in-line, so that automatic measurement is not possible. In the case of using a goniometer, the measuring time of the angle of the gear to be measured by the goniometer was long, the measured value of the angle of the gear to be measured was inaccurate, and there was a measurement error.

A first object of the present invention is to measure a gear to be measured based on a difference between a reference displacement of the master gear and a displacement of the gear to be measured without rotating the gear to be measured with respect to the fixing means. Of the present invention is to provide a gear angle measuring method capable of measuring a circumferential error angle between a tooth and an arbitrary point in the radial direction passing through the center of the gear.

A second object of the present invention is to prepare a master gear that has been accurately measured, determine a reference displacement amount, determine whether an error angle is good or not, and determine a very short angle measurement time. Another object of the present invention is to provide a gear angle inspection device that can reduce the cost of the device, quantitatively and accurately measure the angle, eliminate the angle measurement error, inline the device, and calculate the error angle.

[0008]

SUMMARY OF THE INVENTION A gear angle measuring method according to the present invention comprises a fixing means for holding at least a gear to be measured and preventing the gear from rotating, and a test gear which can be brought into and out of contact with the gear to be measured. And a moving means for reciprocating only in one direction parallel to the radial direction of the gear to be measured in order to press the gear for inspection toward the gear to be measured, and a displacement amount of movement by the moving means of the gear for inspection. Using a gear angle measuring device provided with a detection means for determining a reference displacement amount of a master gear in which a circumferential angle between an arbitrary point in the radial direction passing through the center of the gear and a tooth is known in advance, and The displacement of the gear to be measured is determined from the difference between the reference displacement of the master gear and the displacement of the gear to be measured. Characterized by measuring the error angle

Further, the gear angle inspection apparatus of the present invention comprises a fixing means for holding at least the gear to be measured and preventing the gear from rotating, an inspection gear that can be brought into and out of contact with the gear to be measured, and an inspection gear. Moving means for reciprocating only in one direction parallel to the radial direction of the gear to be measured in order to press the gear toward the gear to be measured, and detecting means for obtaining a displacement amount of movement of the test gear by the moving means. The circumferential angle between any point in the radial direction passing through the center of the gear and the tooth is known in advance. There is provided a determining means for determining whether an error angle in the circumferential direction between an arbitrary point in the radial direction passing through the center and the tooth is good or bad.

Further, the gear angle inspecting apparatus of the present invention is characterized in that the reference displacement amount of the master gear and the measured displacement of the master gear whose circumferential angle between an arbitrary point in the radial direction passing through the center of the gear and the tooth is known in advance. A calculating means for calculating a circumferential error angle between the tooth and an arbitrary point in the radial direction passing through the center of the gear to be measured from a difference between the displacement of the gear and the gear;

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front sectional view of a main part showing a gear angle inspection device of the present invention, and FIG. 2 is a plan view of FIG.

The gear angle inspection apparatus according to the present invention comprises a work holder 2 as a fixing means for holding at least the gear 1 to be measured and preventing the gear 1 from rotating, and an inspection and releasable mechanism which meshes with the gear 1 to be measured. A rack gear 3 serving as a gear; and linear guides 4 and 4 serving as moving means for reciprocating only in one direction parallel to the radial direction of the gear 1 to be measured in order to press the rack gear 3 toward the gear 1 to be measured. An electric micrometer 5 serving as a detecting means for obtaining the displacement of the movement of the rack gear 3 by the linear guides 4 and 4 and the circumferential angle between an arbitrary point in the radial direction passing through the center of the gear and the tooth are known in advance. From the difference between the reference displacement amount of the master gear 6 and the displacement amount of the gear under test 1, the quality of the error angle in the circumferential direction between an arbitrary point in the radial direction passing through the center of the gear under test 1 and the tooth is determined. Judgment to judge And a means 7.

Further, the gear angle inspection apparatus of the present invention provides a reference displacement amount of the master gear 6 and a displacement amount of the gear 1 to be measured in a circumferential direction between an arbitrary point in the radial direction passing through the center of the gear and a tooth. The measurement amplifier 8 is provided as arithmetic means for calculating a circumferential error angle between an arbitrary point in the radial direction passing through the center of the gear 1 to be measured and the tooth from the difference between the tooth and the tooth.

In FIG. 1, reference numeral 9 denotes a base plate, and a pair of linear guides 4 parallel to each other at intervals as shown in FIG. 4 are arranged, and a rack gear 3 is arranged above the linear guides 4 and 4.

As shown in FIGS. 1 and 2, a work holder 2 is disposed on the base plate 9, and the work holder 2 has a columnar boss 1 projecting upward.
0 is formed, and a pin mounting hole 11 is provided on the outer peripheral surface of the boss 10 of the work holder 2 in a direction orthogonal to the center axis. The work holder 2 is fixed to the base plate 9 by a plurality of bolts 12.

As shown in FIG. 1, the gear 1 to be measured is disposed on the boss 10 of the work holder 2, and the inner peripheral surface of the fitting hole 13 of the gear 1 to be measured is provided as shown in FIG. A key groove 14 is formed, and the gear 1 to be measured or the master gear 6 that meshes with the rack gear 3 is mounted on the boss 10 of the work holder 2.

As shown in FIGS. 1 and 2, a reference pin 15 is fitted into the pin mounting hole 11 of the boss 10 of the work holder 2, and a fitting hole 13 of the gear 1 to be measured is fitted into the fitting hole 13 of the gear 1 to be measured. The boss 10 is fitted, a reference pin 15 is engaged with the key groove 14 of the gear 1 to be measured, and the gear 1 to be measured is fixed to the boss 10 of the work holder 2 by the reference pin 15.

The boss 10 of the work holder 2 includes
As shown in FIG. 1, the master gear 6 is arranged, and a key groove 17 is formed on the inner peripheral surface of the fitting hole 16 of the master gear 6, as shown in FIG.

As shown in FIGS. 1 and 2, a reference pin 15 is fitted into the pin mounting hole 11 of the boss 10 of the work holder 2, and the boss 10 of the work holder 2 is fitted into a fitting hole 16 of the master gear 6. Are fitted, and a reference pin 15 is engaged with the key groove 17 of the master gear 6, and the master gear 6 is fixed to the boss 10 of the work holder 2 by the reference pin 15.

As shown in FIG. 2, an electric micrometer 5 is disposed at an upper portion near the center near one side of the base plate 9 so as to face one end of the rack gear 3, and a probe 18 of the electric micrometer 5 is provided. Is in contact with the tooth tip at one end of the rack gear 3, and the electric micrometer 5
Is electrically connected to

As shown in FIG. 2, a measuring amplifier 8 is provided on the upper portion near the corner between the other end and one side of the base plate 9.
Is arranged, and the measuring amplifier 8 is electrically connected to the electric micrometer 5 by the wiring 19.

The base plate 9 is a base on which the work holder 2, the linear guides 4 and 4, the electric micrometer 5, the judging means 7 and the measuring amplifier 8 are fixed. The linear guides 4, 4 slide the rack gear 3 in only one direction parallel to the radial direction of the gear 1 to be measured. If a slide mechanism is provided between the rack gear 3 and the base plate 9, the linear guides 4, 4 Can be eliminated.

The test gear is a module for meshing with the gear 1 to be measured, and a rack gear 3 having the same pressure angle and opposite torsion angles in the positive and negative directions. Must slide in parallel. The electric micrometer 5 accurately detects the position when the rack gear 3 meshes with the gear 1 to be measured, and may be a dial gauge or the like.

Next, the operation of the embodiment of the present invention will be described. First, the reference pin 15 is inserted into the pin mounting hole 11 of the boss 10 of the work holder 2 and then the master gear 6 is inserted.
The boss 10 of the work holder 2 is fitted into the fitting hole 16 of
A part of the reference pin 15 protruding from the outer peripheral surface of the boss 10 of the work holder 2 is engaged with the key groove 17 of the master gear 6, and the master gear 6 is fixed to the boss 10 of the work holder 2 by the reference pin 15. .

Next, the rack gear 3 is connected to the linear guide 4,
When the rack gear 3 is moved forward along the master gear 6 along the gear 4, the rack gear 3 is engaged with the master gear 6, and at the same time, the tip of the rack gear 3 is brought into contact with the measuring element 18 of the electric micrometer 5.
And the electric micrometer 5 is connected to the master gear 6
Is detected. Next, when the rack gear 3 is retracted along the linear guides 4, 4, the rack gear 3
Are separated from the master gear 6.

After removing the master gear 6 from the boss 10 of the work holder 2, the boss 10 of the work holder 2 is fitted into the fitting hole 13 of the gear 1 to be measured, and the outer peripheral surface of the boss 10 of the work holder 2. More protruding reference pin 1
5 is engaged with the key groove 14 of the gear 1 to be measured, and the gear 1 to be measured is fixed to the boss 10 of the work holder 2 by the reference pin 15.

After that, the rack gear 3 is connected to the linear guides 4,
4, the rack gear 3 meshes with the gear 1 to be measured, and at the same time, the tip of the rack gear 3 comes into contact with the probe 18 of the electric micrometer 5.
The electric micrometer 5 is in contact with the gear 1 to be measured.
Is detected, and from the difference between the reference displacement of the master gear 6 and the displacement of the gear under test 1, a circumferential point between an arbitrary point in the radial direction passing through the center of the gear under test 1 and the tooth is obtained. Is measured.

The determining means 7 calculates the circle between an arbitrary point in the radial direction passing through the center of the gear 1 to be measured and the tooth from the difference between the reference displacement of the master gear 6 and the displacement of the gear 1 to be measured. The quality of the circumferential error angle is determined.

Further, the measuring amplifier 8 is connected to the master gear 6.
From the difference between the reference displacement amount and the displacement amount of the gear 1 to be measured, an error angle in the circumferential direction between an arbitrary point in the radial direction passing through the center of the gear 1 to be measured and the tooth is calculated.

FIG. 3 shows the principle of the gear angle measuring method according to the present invention, and shows the position of the rack gear 3 which comes into contact with the tooth surface of the gear 1 to be measured when the gear 1 to be measured is rotated by Δθ.
It is assumed that the center of the key groove 14, which is the mounting reference of the gear 1 to be measured, is on the straight line OP, and the involute curve aP is at the position of the regular tooth surface.

The center of the keyway 14 of the gear 1 to be measured is on the straight line OP due to errors in various manufacturing processes of the gear 1 to be measured, but the tooth surface becomes an involute curve a'P '. Then, the angle error becomes Δθ.

When the rack gear 3 is brought into contact with the gear 1 to be measured at a regular tooth surface position, the position of the rack gear 3 is a straight line AB which is in contact with the involute curve aP at a point P. Similarly, a straight line A′B ′ parallel to a straight line AB that is in contact with the involute curve a′P ′ is a rack gear 3 to be measured.
Position.

Here, since the rack gear 3 slides in parallel with the straight line OP, when the measured gear 1 has an angular error of Δθ, the movement amount of the rack gear 3 is the length of the straight line PL. Become.

Then, as shown in FIG. 3, since Equation 1 is satisfied, ∠PLq = α0... Equation 1 A straight line PL is represented by Equation 2. PL = PP ″ · (cosα0 / sinα0) Equation 2

Here, since the straight line PP ″ is Equation 3, PP ″ = Pq / cos α0 = (rg / cos α0) · Δθ (Equation 3) By substituting Equation 3 into Equation 2, the straight line PL becomes Equation 4. , PL = rg · Δθ / sinα0 (Equation 4) Therefore, Equation (5) is obtained, and the angle error can be calculated from the displacement amount of the rack gear 3. Δθ = PL · sin α0 / rg Equation 5

In order to measure the angle error, the arc length PP 'of the reference pitch circle may be measured, and the angle may be calculated from the diameter of the reference pitch circle. PP 'cannot be measured. In addition, since the angle error is generally about ± 15 ′, PP ″ ≒ PP ′ may be used, but it is difficult to measure because the length of the straight line PP ″ is very short.

In the present invention, since the very short straight line PP ″ is divided by sin α0 as shown in Expression 2, there is an amplifying effect. For example, the pressure angle α0 of the gear is determined by the Japanese Industrial Standard (JI).
S) defines 14.5 ° and 20 °, but 1 / si
n14.5 ° = 4.1 and 1 / sin20 ° = 2.9. In the case of a helical gear, the calculation can be performed in exactly the same manner as long as the pressure perpendicular to the shaft is α0.

As an application example, in normal operation of a processing site, the following is performed in order to remove errors of each mechanism. For example, when measuring 30 ° ± 0.15 °, 30.15 ° for large range, 30 ° for zero master, 29.85 ° for small range
The three types of master gears are prepared, and the positions of the master gear and the rack gear 3 including errors of the respective mechanisms are measured, and the measurement is made as a comparative measurement.

If a dial gauge is used instead of the electric micrometer 5, the cost of the device can be reduced. It is also possible to automate the parallel forward and backward movements of the rack gear 3 in the radial direction of the gear 1 to be measured.

If the gear 1 to be measured is automatically attached to and detached from the boss 10 of the work holder 2, the measuring time is short,
The cost is low, and fully automatic measurement is possible by in-line equipment. Similar effects can be obtained with gears other than rack gears as inspection gears. The gear to be measured can be applied to other gears such as a cycloid gear in addition to the involute gear. Furthermore, when it is desired to perform strict angle measurement, more accurate angle measurement can be performed by correcting the OBD of the gear 1 to be measured.

[0041]

According to the gear angle measuring method of the present invention, since the fixing means fixes the gear to be measured, the gear to be measured does not rotate with respect to the fixing means, and the moving means uses the inspection gear. Moves toward the gear to be measured, the inspection gear can be pressed against and meshed with the gear to be measured, and the detecting means detects the displacement of the movement by the moving means of the inspection gear. From the difference between the reference displacement of the gear and the displacement of the gear to be measured, it is possible to measure the circumferential error angle between any tooth in the radial direction passing through the center of the gear to be measured and the tooth.

According to the gear angle inspection apparatus of the present invention, if a master gear measured accurately is prepared and the reference displacement is determined, the reference displacement of the master gear and the gear to be measured are determined. From the difference between the displacement amount and the tooth, it is possible to judge by a judging means whether or not an error angle in a circumferential direction between an arbitrary point in the radial direction passing through the center of the gear to be measured and the tooth is determined. The measurement time of the angle is much shorter than that using a meter, the cost of the device is low, the angle can be measured quantitatively and accurately, there is no angle measurement error, and the device can be inlined. It is possible to automate the measurement.

Further, the calculating means calculates an error in the circumferential direction between an arbitrary point in the radial direction passing through the center of the gear to be measured and the tooth from the difference between the reference displacement of the master gear and the displacement of the gear to be measured. Since the angle is calculated, the quality of the gear to be measured can be inspected based on the error angle calculated by the calculation means.

[Brief description of the drawings]

FIG. 1 is a main part front sectional view showing a gear angle inspection device according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a principle diagram of a gear angle measuring method according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 gear to be measured 2 work holder 3 rack gear 4 linear guide 5 electric micrometer 6 master gear 7 judgment means 8 measuring amplifier 9 base plate 10 boss 11 pin mounting hole 12 bolt 13 fitting hole 14 key groove 15 reference pin 16 Fitting hole 17 Keyway 18 Probe 19 Wiring

Claims (3)

[Claims] 1. A fixing means for holding at least a gear to be measured so as not to rotate, a test gear which can be freely contacted with and separated from the gear to be measured, and a test gear which faces the gear to be measured. A gear angle measuring device including a moving unit that reciprocates only in one direction parallel to the radial direction of the gear to be measured and a detecting unit that obtains a displacement amount of movement of the inspection gear by the moving unit is used. The reference displacement of the master gear and the displacement of the gear to be measured, in which the circumferential angle between any point in the radial direction passing through the center of the gear and the tooth is known in advance, and the displacement of the gear to be measured are determined. The difference between the displacement of the gear to be measured and the displacement of the gear to be measured is used to measure the circumferential error angle between the tooth and any point in the radial direction passing through the center of the gear to be measured. Gear angle measurement method. 2. A fixing means for holding at least a gear to be measured and preventing the gear from rotating, a test gear which can be freely contacted with and separated from the gear to be measured, and a test gear which faces the gear to be measured. A moving unit that reciprocates only in one direction parallel to the radial direction of the gear to be pressed, a detecting unit that calculates a displacement amount of movement of the test gear by the moving unit, and a moving unit that moves radially through the center of the gear. Any point in the radial direction passing through the center of the gear to be measured from the difference between the reference displacement of the master gear and the displacement of the gear to be measured, whose circumferential angle between the arbitrary point and the tooth is known in advance. A gear angle inspection device comprising: a determination unit configured to determine whether an error angle in a circumferential direction between the tooth and the tooth is good or bad. 3. The difference between the reference displacement of the master gear and the displacement of the gear to be measured, where the circumferential angle between any point in the radial direction passing through the center of the gear and the tooth is known in advance. 3. The gear angle inspection device according to claim 2, further comprising a calculating means for calculating a circumferential error angle between a tooth and an arbitrary point in the radial direction passing through the center of the measuring gear.