JPH05296703A - Tooth form measurement device for internal gear - Google Patents

Abstract

PURPOSE:To automatically and accurately measure a pitch error, a tooth trace error or the like by providing a turntable capable of giving intermittent relative rotation with an internal gear, a travel base, and two probes fitted to an internal gear position measurement probe lever and the travel base. CONSTITUTION:A sensor s1 is mounted on a guide frame 20 at the opposite side of a measurement ball 13, in order to indirectly read a displacement amount xk from an X-shaft X as a reference line across the center of a turntable to the center 13a of the ball 13. Also, a sensor s2 is mounted on a drive cylinder 21, in order to measure the radial error of a support point P for a tooth surface position measurement probe lever 12, and measures an extent necessary for the cylinder 21 to advance or retreat from the reference position of a scale fitted to the guide frame 20. A travel base advances toward backlash H required for measurement regarding the arbitrary tooth form of an internal gear G, and the lever 12 advances integrally with the travel base. According to this construction, the approximate value of a pitch circle error for the backlash H relative to an index angle can be obtained by measuring the value of the displacement amount xk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tooth profile measuring device for an internal gear, which is optimal for properly measuring pitch error, tooth trace error, etc. of a work such as an internal gear finished by a die cutter. ..

[0002]

2. Description of the Related Art Conventionally, for cutting an internal gear, for example, from a large-diameter ring having a diameter of more than 1 m, a pinion cutter or a hob cutter is used to cut a tooth. There was an opportunity. Then, after finishing the tooth cutting on the large-diameter ring body, the burrs formed on the upper and lower edges of the tooth profile of the gear are chamfered for finishing.

At this time, in the conventional chamfering machine, for example, when the work is an internal gear, for example, an internal gear that rotates relative to each other on a machining table and the internal gear of this internal gear are used. There is a cutter formed by a cutter that performs polishing by detecting the stylus pin that follows the tooth profile so that it can rotate and move in the radial direction while rotating.

Incidentally, for example, as a processing error using a gear cutting machine or the like, a tooth profile error due to a bending in a tooth trace direction due to a difference in sharpness of a pinion cutter or the like with respect to a work and a movement of the cutter in the circumferential direction are involved. A tooth profile error caused by whether or not the correction is correct, a pitch error caused by a change in the work W due to processing heat (cutting heat), and the like are considered.

As described above, a conventional measuring apparatus for measuring the machining accuracy of an arbitrary tooth profile formed on the inner circumference of an internal gear after cutting or chamfering a large-diameter ring body exceeding 1 m, for example, is shown in FIG. There is one shown in. That is, first, the phase is set to 180
Two tooth gaps H of the internal gear G as workpieces of different degrees
By inserting the measuring balls 13 ', 13' provided at both ends of the rod portion n of the inner diameter micro N with the scale indication in 1, H2 into the measuring balls 13 ', 13', Tooth-shaped tooth spaces H1 and H2 on both sides
Hold it on both left and right sides. Then, the measuring balls 13 ', 1 from the tooth space H1 to the tooth space H2 according to the change in the machining accuracy of the gear cutting or chamfering of the two facing tooth spaces H1, H2.
The pitch circle PC is measured by the size of the contact distance L'of 3 '. By repeating this operation for each tooth space in several places with different phases every 180 degrees, the error of the pitch circle in the radial direction due to the machining heat of the whole work or the sharpness of the cutter can be measured. taking measurement.

After that, the center point 1 of the measuring balls 13 ', 13' held in the tooth spaces H1, H2 of the internal gear G is 1.
The tooth width and pitch error in each tooth profile on the pitch circle PC intersecting with 3'a, and the tooth trace error due to the run of the tooth space were measured.

[0007]

However, the above-mentioned conventional measuring method requires much labor and time because the measurement is carried out manually, and the measurement requires considerable skill.
Moreover, in order to perform the measurement, first, the center of the internal gear as the work is set to match the machine center, and then the reference point of the inner diameter micro as the measuring tool is set to match the machine center. It was not possible to measure pitch error, tooth width error, tooth trace error, etc. with high accuracy.

Therefore, the present invention provides a pitch error, a tooth trace error,
An object of the present invention is to provide a tooth profile measuring device for an internal gear, which is capable of automatically and highly accurately measuring the inner diameter surface of a work and the pitch circle without requiring manual labor.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an internal gear as a work set on a working table and an intermittent relative relative to the internal gear. A rotary table that rotates, and a moving base that is provided on the rotary table so as to advance and retract in the radial direction along the reference line with a radial connection line that connects the center of the rotary table and the indexing start position as a reference line, A measurement ball is pivotally supported in a substantially horizontal swingable manner by a fulcrum located on a line corresponding to the reference line of the moving base, and a measurement ball is provided at the tip so as to be selectively detachable according to the size of the tooth profile of the internal gear. A tooth surface position measuring rod and first and second measuring elements provided on the moving base, and the measuring ball is held in the tooth space of the internal gear so that a substantially central position of the tooth profile is obtained. Is provided so that the first The sizing element is provided so as to be capable of contacting and moving up and down on the side surface of another gap adjacent to any gap in which the measurement ball is held, so that the distance from the center point of the measurement ball to the contact point of the other gap. Is used to measure the pitch error and the tooth profile error of the tooth profile, and the second probe contacts the inner surface of the tooth top of the internal gear and is provided on the inner diameter of the internal gear so that it can be measured. did.

[0010]

[Operation] With respect to the internal gear as a work set on the working table, the moving base moves in the radial direction along the radially extending reference line connecting the center of the rotary table and the indexing start point of the rotary table. Then, the measuring ball at the tip of the tooth surface position measuring rod pivotally supported by the fulcrum located on the reference line of the moving base so as to be swingable in a substantially horizontal direction and movable in the radial direction. The center point of the measuring ball is determined by being clamped in the tooth space of the tooth profile. Therefore, the reference position for starting the measurement is determined from the displacement amount from the reference line to the center point of the measuring ball, and the tooth profile can be measured.

Further, since the pitch error measuring element provided at the tip of the moving base comes into contact with the side surface of another tooth space adjacent to an arbitrary tooth space in which the measuring ball is held, the pitch error measuring element moves from the center of the measuring ball to the center of the measuring ball. Pitch error is automatically measured by detecting the distance to the point.

Further, the inner diameter measuring element provided at the tip of the moving base is brought into contact with the tooth tip surface of the internal gear to measure the pitch error due to the radial movement of the cutter with respect to the internal gear, and the pitch circle of the work is determined. It can be calculated.

After measuring the pitch error in this way, when the moving base retracts from the work, the measuring ball comes out of the tooth space of the tooth profile to be measured. Then, the moving base advances again, and the tooth trace error is measured by moving up and down while the pitch error measuring element is in contact with one side of the tooth gap in the adjacent tooth profile.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where the present invention is applied to a chamfering machine for internal gears according to FIGS. 1 to 6 will be described as an embodiment.
In FIG. 1 and FIG. 2, reference numeral 1 denotes a machining table, and on the machining table 1, a chamfering device unit 2 and a tooth profile measuring device unit 3 are provided.
And are assembled.

1 and 2, the machining table 1 is provided with a fixed table 4 for setting an internal gear G as a work W on the outer peripheral side, and a work table W provided on the inner peripheral side of the fixed table 4. 180 for internal gear G
Rotary table 5 that rotates relative to each other intermittently at a rate of degrees / number of teeth
It is formed by and. The turntable 5 is rotated by a motor M1 for indexing a rotation angle.

1 and 2, the chamfering device section 2
Is a slide table 6 provided on the rotary table 5, a drive unit 7 installed on the slide table 6, and a work W which is detachably and vertically movable on the drive unit 7.
It is formed by a cutter 8 as a tool that rotates in a direction indicated by an arrow a relative to the internal gear G as shown in FIG. The cutter 8 is rotated by a motor as a drive source built in the drive unit 7.

1 and 2, the sliding table 6 moves in the radial direction of the workpiece W by the driving force of the cylinder 9 so that the rotary table 5 rotates relative to the workpiece W. Cooperating with internal gear G
The chamfering is performed by cutting the burrs formed on the upper and lower edges of the tooth profile.

1, FIG. 2, FIG. 3 and FIG. 4, the tooth profile measuring unit 3 is located at the center bisector connecting the center O of the rotary table 5 and the index start position of the rotary table 5. A movable base 1 provided on the rotary table 5 of the machining table 1 so as to be movable back and forth in the radial direction with the axis X as a reference line.
0, and swinging in a substantially horizontal direction as a Y-axis Y direction (circumferential direction) intersecting with the X-axis X by an axis 11 as a fulcrum P located on the X-axis X as a reference line of the moving base 10. A tooth surface position measuring rod 12 which is freely pivoted and is movable in the radial direction, and an X axis which is attached to the tip of the tooth surface position measuring rod 12 and serves as the reference line in the Y axis direction Y. A measuring ball 13 that determines a substantially central position C of the tooth profile of the internal gear G to be measured by a displacement amount xk from X, and another tooth space H adjacent to an arbitrary tooth space H in which the measuring ball 13 is held. It is provided at the tip of the moving base 10 so as to be capable of contacting the side surface 14 'of the movable base 10 and is movable up and down. Pitch error gauge for measuring tooth pitch error 6, the tooth tip inner surface 1 of the internal gear G
7 is provided at the tip of the moving base 10 so as to be able to abut
The inner diameter measuring element 18 for measuring the inner diameter of the internal gear G.

3 and 4, the moving base 1 is shown.
Reference numeral 0 denotes a ball screw shaft 1 that passively rotates its rotational force by being connected to a motor shaft m of a servo motor M as a drive source provided on the rotary table 5.
By providing the nut portion 10a screwed into the lower surface 9 on the lower surface, the center O of the rotary table 5 and any of the rotary table 5 at the time of measuring the tooth profile are guided while being guided by the guide frames 20 opposed to the radial direction of the internal gear G. It can freely move back and forth along the X-axis X-line as a radial reference line connecting the index start position Q. Reference numeral 21 denotes a drive cylinder provided on the upper surface of the moving base 10 for measuring the tooth trace position. The drive cylinder 21 moves forward and backward integrally with the moving base 10 which moves forward and backward in the radial direction by the rotation of the ball and screw shaft 19. To do.

3 and 4, the X-axis X as a reference line for pivotally supporting the tooth surface position measuring rod 12.
The shaft 11 provided on the line is pivotally supported on the upper surface of the drive cylinder 21 by being provided in the vertical direction of the holding frame 22. Reference numeral 23 denotes a roller component as a friction damping component mounted on the lower surface of the tooth flank position measuring rod 12 in order to smoothly swing the tooth flank position measuring rod 12.

2 and 4, the pitch error measuring element 16 is fixed to the holding frame 22, for example, at the tip of the rod 24a of the cylinder 24, and is held in the tooth space H of the tooth profile to be measured. Center point 13a
½ pitch error is measured by measuring the distance K from the contact point 15 to one side surface of the other tooth space H ′ adjacent to the tooth space H ′. After pulling out the measuring ball 13 from the drive cylinder 21, the drive cylinder 21 is driven again to move forward and the cylinder 24 is driven to move the pitch error probe 16 up and down while contacting the one side surface 14 of the tooth space H '. Tooth error measurement.

The inner diameter measuring element 18 is provided at the tip of the moving base 10 via a spring or a buffer such as hydraulic pressure.

2, FIG. 3 and FIG. 4, reference numeral 25 denotes a recording element provided at the other end of the tooth surface position measuring rod 12 on the side opposite to the measuring ball 13 for recording the measured value of the pitch error. In this embodiment, the recording element 25 is adapted to automatically enlarge the measurement value measured by the pitch error measuring element 16 on the recording drum 26 provided so as to be in contact with the recording drum 26 and automatically record the enlarged value.

In FIG. 4, S1 is a sensor for indirectly reading the displacement amount xk from the X axis X as a reference line passing through the center O of the rotary table 5 to the center point 13a of the measuring ball 13. Further, it is provided on the guide frame 20 at the line segment m1 from the fulcrum P to the center point 13a of the measurement ball 13 or the line segment m2 that is an integral multiple thereof on the side of the tooth surface position measuring rod 12 opposite to the measurement ball 13. ..

In FIG. 4, S2 is the tooth surface position measuring rod 12.
Is a sensor for measuring an error Δρ in the radial direction of the fulcrum P of the sensor. This sensor S2 is attached to, for example, a drive cylinder 21 for measuring tooth traces, and which sensor is used with respect to a reference position of a scale attached to the guide frame 20. Measure whether or not to move back and forth.

One embodiment of the present invention is configured as described above, and in order to chamfer the internal gear G in FIGS. 1 and 2, the internal gear G as the work W is set on the fixed table 4. Fix it. By intermittently rotating the rotary table 5 at a ratio of 180 degrees / number of teeth, the cutter 8 rotates relative to the work W in the direction shown by the arrow A in FIG. 2 and the stylus pin SP moves inward. The sliding table 6 is moved forward or backward in the radial direction by the driving force of the cylinder 9 that is driven by following the tooth profile of the tooth gear G to form the upper or lower edge of the tooth profile of the internal gear G. Cut the burrs and chamfer them.

In order to measure the machining accuracy of the tooth profile of the internal gear G, which has been chamfered in this way, the ball motor driven by the servo motor M in FIGS. 1, 2, 3 and 4 is used. When the screw shaft 19 rotates, the moving base 10 having the nut portion 10a inserted in the ball screw shaft 19 on the lower surface thereof moves in a radial line passing through the center O of the rotary table 5, that is, the X-axis X as a reference line. First, the toothed gear G is advanced in the direction of the tooth gap H in the arbitrary tooth profile to be measured. And a drive cylinder 21 provided on the moving base 10,
The shaft 11 and the holding frame 22 are provided on the upper surface of the drive cylinder 21.
The tooth surface position measuring rod 12 pivotally supported by the moving body 10 advances together with the moving base 10.

Then, in FIG. 4, the tooth surface position measuring rod 12 is provided.
The measuring ball 13 provided at the tip of is inserted into the tooth space H of the tooth profile to be measured after chamfering the internal gear G, and the left and right peripheral surfaces thereof contact the left and right side surfaces of the tooth space H. Therefore, even if the tooth profile is machined with any size and any kind of error, the left and right peripheral surfaces of the measuring ball 13 provided at the tip of the tooth surface position measuring rod 12 are within the left and right of the tooth space H. By touching the side surface, the center point 13 of the measuring ball 13
a is determined, and the center point 13a coincides with the approximate center position C of the tooth space H.

4 and 5, if the displacement amount from the X axis X as a reference line passing through the center O of the rotary table 5 to the center point 13a of the measuring ball 13 is xk, the value of this displacement amount xk By measuring the value, an approximate value of the error L1 on the pitch circle PC regarding the indexing angle of the tooth gap H in the tooth profile to be measured as the workpiece W of the moving base 10 rotated by the rotary table 5 is obtained. In this case, it is actually difficult to directly read the displacement amount xk because the measuring ball 13 gets into the tooth space H, and therefore the center point 13a of the measuring ball 13 from the fulcrum P of the tooth surface position measuring rod 12. The line segment m1 up to or a line segment m2 that is an integral multiple thereof may be indirectly read by the sensor S1 provided on the opposite side of the measuring ball 13 from the fulcrum P.

When the moving base 10 is moved forward, the pitch error measuring element 16 is provided on the holding frame 22 at the tip of the moving base 10 so as to be able to move up and down.
However, since the measuring ball 13 contacts the one side surface 14 of the tooth space H'adjacent to the held tooth space H, the distance from the contact point 15 on this one side surface to the center point 13a of the measuring ball 13 should be measured. It becomes 1/2 pitch of the tooth profile and the pitch can be measured.

Then, the magnitude of the pitch error in the circumferential direction is measured by the magnitude of the measured value of the displacement amount xk from the X axis X as the reference line to the center point 13a of the measuring ball 13, and the center O of the rotary table 5 is measured. It is possible to know whether or not the center O'of the work W is set to coincide with. As a result, it is possible to make a correction to match the set position of the center O ′ of the workpiece W set on the fixed table 4 with the center O of the rotary table 5 depending on the magnitude of the absolute value of the displacement amount xk as a measured value. Is.

Further, as the moving base 10 moves forward, the inner diameter measuring element 18 provided at the tip of the moving base 10 comes into contact with the inner diameter surface of the internal gear G as the work W, that is, the tooth crest surface, and the inside of the center O of the rotary table 5 is removed. The radial distance L to the inner diameter surface of the gear tooth G can be measured.

Considering the theoretical value of the error L1 relating to the above-described indexing angle on the pitch circle PC, which is one of the causes of the pitch error according to FIGS. 5 and 6, originally, the center O of the rotary table 5 is considered.
The measuring ball 13 coincides with the X axis X as a reference line passing through
Of the tooth profile of the machined work W has no error, and the center position C of the tooth profile and the center point 13a of the measuring ball 13 are coincident with each other. Gap H is X-axis X as shown by the solid line
When the measuring ball 13 is held in the tooth space H displaced from the position, the error L1 on the pitch circle PC regarding the indexing angle is a triangle having the X-axis X and the displaced X-axis X ′ as the included angle. The following expression 1 is established in s1, O, and s2.

[Formula 1] L1 = Dp / 2 × ΔHk. Where Dp is the diameter of the pitch circle PC and ΔH
k is a value obtained by dividing twice the arc line segment Lk on the pitch circle PC by the diameter Dp, that is, 2Lk / Dp. In FIG. 5, the right flank has a negative value and the left flank has a positive value.

The displacement amount xk is a value obtained by subtracting the distance R from the diameter Dp of the pitch circle PC in FIG. 5 to the center O of the rotary table 5 and the center point 13a of the measuring ball 13,
That is, it corresponds to the height of the triangles s2, 13a, s3. Here, if the diameter of the measuring ball 13 is d1 and the tool pressure angle is ∠αh, the height of the triangles s2, 13a, s3 is d1 / 2 × sinαh.

Therefore, the following equation 2 is established for the displacement amount xk.

[Formula 2] xk≈ (Dp / 2−d1sin × αh) × 2Lk / Dp = Lk−d1 · Lk / Dp × sinαh.

By summarizing the above equations 1 and 2, the following equation 3 is obtained.

[Formula 3] Lk = Xk / 1− (d1 / Dp × sin αh). Here, since the tool pressure angle αh becomes a factor that determines the arc line segment Lk on the pitch circle PC of FIG. 5, for example, at the time of gear cutting, one-tooth, one-to-one milling using a cutting cutter whose sharpness is controlled. It turns out that high precision machining can be performed.

Next, according to FIG. 5 and FIG. 6, another one of the pitch errors depending on whether the tooth profile of the work W is outside or inside the ideal pitch circle PC drawn at the center O of the rotary table 5. Considering the error L2 in the radial direction, which is the cause, the center position C of the tooth profile of the work W now coincides with the X axis X as a reference line passing through the center O of the rotary table 5 and is equal to the pitch circle PC. The solid line shows the case where the tooth profile is formed, the imaginary line B shows the case where the tooth profile is excessive in the radial direction, and the imaginary line B shows the excessive profile of the tooth profile in the radial direction.

The radial error L2 when the state shown by the solid line in FIG. 6 enters too much as shown by the imaginary line B is the displacement amount Δ from the solid line position on the reference line X-axis X as shown by the imaginary line B. yields rk. Therefore, the measuring ball 13 held in the tooth space H is also held in the tooth profile indicated by the solid line, and is also held in the state indicated by the imaginary line B, so that the displacement amount Δrk is also displaced on the X-axis X. To do. Then, this displacement amount Δrk can be projected on the triangles s5, s6, s7 formed by moving in parallel with the pitch circle PC to a position where the apex angle of the tool pressure angle αh intersects.

Then, in FIG. 6, the triangles s5 and s
The heights of triangles s6, s7, s8 adjacent to 6, s7 are
The error L2 depends on whether the tooth profile is inside (or outside) in the radial direction, and the following expression 4 is obtained.

[Formula 4] L2≈Δrk × tan αh

By the way, referring to FIGS. 5 and 6, where the displacement amount Δrk is detected, the tooth surface position measuring rod 12 is arranged on the X-axis X as a reference line in the radial direction of the measurement pitch circle PC. Since the fulcrum P exists, the displacement amount Δρ of the error in the radial direction is measured from the center point 13a of the measurement ball 13 shown by an imaginary line having the center point 13a on the X axis X as the reference line in FIG. Fulcrum P
Taking into account the included angle θk formed by the intersection line E passing through and the reference line X ′ passing through the fulcrum P when the measuring ball 13 is displaced as shown by the solid line position, the following expression 5 is established.

[Formula 5] Δrk = Δρk−m1 (1-cos θk) where m1 is the distance from the center point 13a of the measuring ball 13 to the fulcrum P to the tooth surface position measuring rod 12, and m2 is the fulcrum P to the tooth. It is the distance to the other end of the surface position measuring rod 12.

Then, by converting the equation 5, the following equation 6 is obtained.

[Formula 6] Δrk = Δρ−m1 (1-cos θk) = Δρ−m1 (1-Y)

Therefore, the following equation 7 is obtained for the error L2 in the radial direction.

[Formula 7] L2 = [Δρk-m1 (1-Y)] tanαh Here, the sign of the displacement amount Δρk of the error in the radial direction is a positive value when the radius of the fulcrum P position exceeds ρ, and is less than ρ If the value is negative.

Therefore, in FIG. 5 and FIG. 6, the following equation 8 is obtained for the error Lk of the K-th tooth surface position.

[Formula 8] Lk = L1 + L2 = [Xk / (1-d1 / Dp × sinαh)] + [Δρk-m1 (1-Y)] tanαh where d1 is the measured ball diameter, Dp is the diameter of the pitch circle PC, αh is the tool pressure angle, m1 is the fulcrum P and the measuring ball 1
3 to the center point 13a. These measured ball diameter d1, pitch circle diameter Dp, tool pressure angle αh, fulcrum P
The length m1 from to the center point 13a of the measuring ball 13 is a known number. If these known numbers are stored in advance in the storage unit of the computer, the pitch error Lk of the Kth tooth surface position is displaced from the X axis X as the reference line for the other measuring balls 13 with respect to an arbitrary tooth profile. In this case, the displacement amount xk of the center point 13a and the displacement amount Δρk of the error in the radial direction can be easily calculated by actually measuring the actual measurement values.

Therefore, the internal gear is processed by the arithmetic unit of the computer, the moving base 10 is moved forward and backward by the drive of the servo motor M via the control unit, and the drive of the drive cylinder 21 is corrected and driven. High-precision chamfering can be performed with a small error value between the G pitch error and the tooth trace error.

After measuring the pitch error in this way, if the servo motor M is rotated in the reverse direction to rotate the ball screw shaft 19 in the reverse direction, the moving base 10 moves backward. Then, the retraction of the moving base 10 is stopped at the position where the measuring ball 13 provided at the tip of the tooth surface position measuring rod 12 provided on the moving base 10 is pulled out from the tooth gap H of the work W. At this time, the moving base 10
The inner diameter measuring element 18 provided at the tip of the
Away from.

Then, the drive cylinder 21 provided on the upper surface of the moving base 10 is driven to extend the cylinder rod 21, so that the cylinder rod 21a.
The pitch error measuring element 16 provided on the holding frame 22 provided at the tip of the gear moves up and down by driving the cylinder 24 provided on the holding frame 22 by contacting one side surface of the tooth space H'and measures the tooth trace. To do.

Further, the displacement amount xk from the X axis X as a reference line passing through the center O of the rotary table 5 to the center point 13a of the measuring ball 13 is a tooth surface position measuring element pivotally supported by the shaft 11 as a fulcrum P. Since the rod 12 is provided on the opposite side of the measuring ball 13, the enlargement amount Xk is recorded on the recording drum 26 by the recording element 25.

[0048]

According to the present invention, the pitch error, the tooth trace error, the inner diameter surface of the work, and the pitch circle can be automatically measured with high accuracy without manual labor.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a vertical cross-sectional view of a main part.

FIG. 4 is a plan view showing a tooth profile measuring device portion of the present embodiment.

FIG. 5 is a plan view for explaining a case of measuring a pitch error related to an indexing angle in this embodiment.

FIG. 6 is a plan view for explaining a case of measuring a pitch error relating to perspective in a radial direction in the present embodiment.

FIG. 7 is a plan view showing an example of a conventional measuring apparatus of this type.

[Explanation of symbols]

 1 machining table 2 chamfering device part 3 tooth profile measuring device part 4 fixed table 5 rotary table 6 sliding table 8 cutter 10 moving base 12 tooth surface position measuring rod 13 measuring ball 13a center point 15 contact point 16 pitch error measuring element 18 Inner diameter probe 21 Drive cylinder 22 Holding frame 24 Cylinder G Internal gear M1 Servo motor M Motor P Support point W Work

Claims (2)

[Claims] 1. An internal gear as a work set on a machining table, a rotary table that intermittently rotates relative to the internal gear, and a center of the rotary table and an indexing start position. A movement base provided on the rotary table so as to advance and retreat in the radial direction along the reference line with a radial connection as a reference line, and a fulcrum located on a line corresponding to the reference line of the movement base in a substantially horizontal direction. And a tooth surface position measuring rod with a measuring ball attached to the tip, which is pivotally supported on the shaft and is selectively detachable according to the size of the tooth profile of the internal gear.
The measuring ball includes first and second measuring elements provided on the moving base, and the measuring ball is provided so as to be able to determine a substantially central position of a tooth profile by being held in a tooth gap of the internal gear.
The first measuring element is provided so as to be capable of contacting and moving up and down on the side surface of another tooth space adjacent to an arbitrary tooth space in which the measuring ball is held, so that the first measuring element can move from the center point of the measuring ball to the other tooth space. It is provided so as to be able to measure the tooth pitch error and the tooth trace error at the distance to the contact point, and the second probe can contact the inner surface of the tooth tip of the internal gear to measure the internal diameter of the internal gear. A tooth profile measuring device for an internal gear, comprising: 2. The tooth profile measuring apparatus for an internal gear according to claim 1, wherein the tooth profile measuring unit is provided in a gear machining machine for chamfering an internal gear.