JP3489516B2 - Ball groove groove shape measuring apparatus and groove shape measuring method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groove shape measuring device and a groove shape used when measuring the shape of a ball groove formed on a work, for example, a sheave part constituting a belt type CVT. Regarding measurement method.

[0002]

2. Description of the Related Art A transmission for an automobile has a pair of pulleys (primary side and secondary side) whose pulley diameters are variable.
Belt type C with an annular belt hung between them to change the gear ratio steplessly by changing the pulley diameter.
There is a VT (continuously variable transmission).

Both pulleys used in a CVT are, as shown in FIGS. 8 and 9, a stationary sheave 1 having a shaft portion 1a on the front side and a cylindrical movable sheave 2 having a boss portion 2a on the rear side. And are slidably combined via the ball spline 3 to form a V-groove shape.

In such a CVT pulley, it is required that the pulley diameter smoothly changes in accordance with the gear ratio command. This involves the ball grooves that make up the ball spline.

By the way, a ball groove 4 formed on the outer peripheral surface of the shaft portion 1a of the stationary sheave 1 constituting the ball spline, and a ball groove formed on the inner peripheral surface of the boss portion 2a of the movable sheave 2 as well. 5 are all processed into an elliptical arc shape according to predetermined specifications [illustrated in FIG. 9 (b): for making point contact with the ball 6].

[0006]

In order to see whether or not the performance of the ball spline is good, the shapes of the ball grooves 4 and 5 formed on the peripheral surface may be seen.

However, since the arcuate shapes on both sides (left and right) of the groove widths of the ball grooves 4 and 5 are complicated curved surfaces, it is difficult to measure the shape in contact with the ball 6, and the quality cannot be easily determined. .

With respect to the CVT ball groove, there is a device for measuring the angular interval at which the ball groove is arranged, as in Japanese Patent Laid-Open No. 9-210606, but the shape of the ball groove, particularly a fine cross section in the plane direction, is disclosed. No device is found to measure the state of shape. There is an optical shape measuring device, for example, as a device for measuring a normal shape, but when measuring the shape of a deep part such as the inner surface shape of a groove, an error is likely to occur if it is an optical type. However, it is not suitable for measuring the arc shape of the inner surface of the ball groove. Moreover, it tends to be complicated.

The present invention has been made by paying attention to the above circumstances, and its purpose is to make it simple and highly accurate.
An object of the present invention is to provide a groove shape measuring device for a ball groove and a groove shape measuring method capable of measuring arc shapes on both sides of the groove width of the ball groove.

[0010]

In order to achieve the above object, a groove shape measuring device for a ball groove according to claim 1,
The ball groove groove shape measuring method described in 2 is arranged such that a tracing stylus smaller than the groove width of the ball groove is pressed against the peripheral surface of the work having the ball groove so as to press the peripheral surface. move the surveying stator in a direction transverse to the grooves, it calculates the arc shape of the inner surface of the ball groove from the trajectory of the measuring element to be displaced into the ball grooves and out direction following the arcuate shape of the ball groove at this time, from the arc-shaped Center of arc shape on both sides of ball groove
The position of the bow that fits into the ball groove from the center position
When the ball is fitted, find the center position of the ball
I have tried to kill it.

[0012] Accordingly, since the tracing stylus directly and sequentially detects each arc portion of the ball groove,
The arc shape on both sides of the ball groove is measured with high accuracy.
And it's easy. Besides, the bow that fits in the ball groove
It is possible to measure the degree of combination with the tool.

[0012]

[0013]

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on an embodiment shown in FIGS.

FIG. 1 shows a sheave component of a CVT which is a work, for example, a groove of a ball groove 4 formed by three threads (a plurality) on the outer circumference of a shaft portion 1a of a stationary sheave 1 shown in FIGS. A groove shape measuring device for measuring the shape is shown,
Is the base of the device. The base 10 extends in the plane direction.

A work set section 11 is installed on the right upper surface of the base 10. The work set portion 11 includes, for example, a fixed side spindle 12 mounted on the upper surface of the base 10 with its tip facing upward, and the spindle 12
And a movable side spindle 13 arranged with the tip facing downward. Of these, movable side spindle 13
Is supported by a guide post 14 which is erected on the upper surface of the base 10 so as to be able to move up and down via an elevator 14a.
Then, between the fixed-side spindle 12 and the movable-side spindle 13, the fixed-side sheave 1 after processing is finished.
However, the pulley wall 1b is rotatably set (held) in a standing posture in which the pulley wall 1b is directed downward and the shaft portion 1a is directed upward.
Further, a rotating device for rotating and displacing the stationary sheave 1 around the axis through a movable spindle 13 such as a motor 15 is installed together with an encoder 16 for detecting the rotational displacement of the work on the lift base 14a. .

On the other hand, on the upper surface of the left side of the base 10, an electric drive type moving table 10a (corresponding to an inserting means) such as an XY table is provided at a position adjacent to a portion having the fixed side / movable side spindles 12 and 13. Is provided. A guide post 17 is erected on the moving table 10a. An elevating table 18 which is movable in the elevating direction is attached to the guide post 17. This lift 18
For example, a drive source incorporated in the guide post 17, for example, a motor 18a is driven to move up and down. A measuring device 20 is installed at the front part of the lifting table 18 so as to project between the fixed side / movable side spindles 12 and 13. A schematic configuration of this measuring device 20 is shown in FIG.

The measuring device 20 comprises a main body portion 21 attached to the front part of the lift 18 and a sensor attaching / detaching portion 22 arranged so as to project from the main body portion 21 between the fixed side / movable side spindles 12 and 13. Have This sensor attaching / detaching part 22
On the other hand, a probe smaller than the groove width of the ball groove 4, for example, a rod-shaped sensor holder 23 having a ball 23a of φ2 at its tip, or a second probe having an outer shape corresponding to the ball 6 to be combined with the ball groove 4, For example, a rod-shaped sensor holder 24 having a φ6 ball 24a at its tip is selectively mounted. The figure shows a state in which the sensor holder 23 is attached. Specifically, the sensor attaching / detaching portion 22 holds the sensor holder 23 so that the ball 23a at the tip projects toward the front, that is, toward the outer peripheral surface of the shaft portion 1a of the stationary sheave 1.

The sensor attaching / detaching portion 22 is, for example, by a support mechanism (not shown), a thrust direction (left and right direction in the drawing) which is the depth direction of the ball groove 4 of the shaft portion 1a and a radial direction which is the groove width direction of the ball groove 4. 2 with (depth direction in the drawing)
It is supported so that it can be displaced in any direction. The main body 2 is attached to the sensor attachment / detachment portion 22 via relay members 25a and 26a.
Two types of rod-shaped pressers 25, 26 extending along the radial direction in 1 are connected. Of these, the presser 25 whose detection surface 25b faces upward, that is, in the length direction of the ball groove 4.
A radial direction detector 27 is installed vertically in the vicinity of. The input portion 27a formed at the tip of the radial direction detector 27 is in close contact with the detection surface 25b, and the radial displacement detected by the ball 23a of the sensor holder 23 is detected by the radial direction detector 27. It is done. In addition, the detection surface 26b is in the lateral direction,
That is, a thrust direction detector 28 is installed laterally near the pressing element 26 that faces the depth direction of the ball groove 4. The input portion 28a formed at the tip of the thrust direction detector 28 is brought into close contact with the detection surface 26b, and the thrust direction displacement detected by the ball 23a of the sensor holder 23 is detected by the thrust direction detector 28. It is done. The relay member 25a includes a spring 2 for holding the sensor holder 23 at a predetermined position.
9 (elastic member) is attached. Then, for example, by utilizing the elastic force of the spring 29, by using the movement of the moving table 10a, the tip of the sensor holder 23,
That is, the ball 23a having a diameter of φ2 is fixed to the fixed sheave 1
The outer peripheral surface of the shaft portion 1a and the inner surface of the ball groove 4 are pressed. Further, the relay members 25a and 26a are moved along the direction orthogonal to the ball groove 4 by, for example, moving means housed in the main body portion 21, for example, an electric slide device 20a. By this slide device 20a, the ball 23a moves in a direction crossing the ball groove 4 while being pressed against the peripheral surface of the shaft portion 1a in a predetermined state, that is, in a state parallel to the axis of the stationary sheave 1. It is done. Now the ball 2
When the ball 3a moves across the ball groove 4, the ball 23a
Enters into the ball groove 4, and then the ball 23a follows the cross section (arc shape) of the ball groove 4 and is displaced inward and outward of the ball groove 4. Then, the displacement of the ball 23a at this time is detected by each of the detectors 27 and 28 to obtain coordinate position information such as two directions of a radial direction and a thrust direction necessary for recognizing the groove shape of the ball groove 4. I am allowed to do so.

On the other hand, reference numeral 30 in FIG. 1 denotes a controller (corresponding to a computing unit) having a computing function, which is configured by including, for example, a microcomputer. The controller 30 includes each part of the groove shape measuring device, that is, the slide device 20a, the motor 15 of the work set part 11, the encoder 16, the moving table 10a, the lifting motor 18a, and the detectors 27 and 28 of the measuring device 20. And a measurement result output unit 32 that outputs measurement data.
Further, the controller 30 has the following functions.

A. The ball 23a of φ2 is fixed to the shaft portion 1a
The function to rotate once while being in contact with the outer peripheral surface of.

B. A function of determining the position of each ball groove 4 from the detection signals in the radial direction and the thrust direction output from the measuring device 20 during the same rotation.

C. Positioning the φ2 ball 23a at the predetermined groove height position of the indexed ball groove 4,
A function to move the ball groove 4 in the direction crossing it.

D. Position information (radial direction and thrust direction detection signals) output from the measuring device 20 during the traverse
A function of measuring an arc forming a cross section of the ball groove 4.

E. A function to perform the least squares method arithmetic processing on the obtained arc locus.

F. A function to find the center position of the arc that has completed the arithmetic processing.

G. From the arc of the obtained center position, the ball 6
A function of determining the ball center position of the ball 6 corresponding to when the ball is fitted into the ball groove 4.

H. Function to output the obtained measurement data.

The controller 30 has, for example, a first
Automatic measurement button 30a, second automatic measurement button 30b
The operation unit 31 having is connected. Further, when the automatic measurement button 30a is operated on the controller 30, the measurement of the groove (cross-section) shape of the ball groove 4 at a plurality of predesignated positions is performed using the functions of a to h with a probe of φ2. Then, when the automatic measurement button 30b is operated, the displacement of the center position of the three ball grooves 4 and the center of the grinding surface other than the grooves is measured by using the above function with the φ6 probe 24. The settings are made.

The operation and measuring method of the groove shape measuring apparatus will be described with reference to the flow chart shown in FIG.
An attempt is made to measure the groove shape of the sheave part whose center is held between the spindles 12 and 13, for example, the ball groove 4 of the stationary sheave 1.

At this time, first, as shown in FIGS. 1 and 2, the measuring element 23a of φ2 is attached to the sensor attaching / detaching portion 22.
Then, the automatic measurement button 30a is pushed. Then, the flowchart shown in FIG. 4 starts.

That is, first, the step of determining the position of each ball groove 4 as in step S1 is started.

In the same process, first, the ball 23a of the sensor holder 23 is guided to the outer circumference of the shaft portion 1a of the stationary sheave 1 by, for example, the moving table 10a, for example, to a point where a preset ball groove 4 is provided, and the same point. Then, the tip of the ball 23a is pressed in a predetermined manner so as to face the axial center of the stationary sheave 1 (an extension line connecting the spindles 12 and 13). Next, the stationary sheave 1 is rotated once around the axis by the motor 15.

At this time, the ball 23a exhibits a behavior of falling in the outer peripheral surface portion of the shaft portion 1a having the ball groove 4 during one rotation of the stationary sheave 1 and in the outer peripheral surface portion having no other ball groove 4 therein. No behavior occurs.

Therefore, the position on the circumference of the shaft 1a where the ball groove 4 is located can be determined from the detection signal of the measuring device 20 and the signal of the encoder 16.

When this step is completed, the process proceeds to step S2, and the step of measuring the planar shape of the ball groove 4 at the groove height designated in advance starts.

In the same process, first, as indicated by reference numeral A in FIGS. 5 and 6, the ball 23a is designated while being pressed against the outer peripheral surface of the shaft portion 1a out of one designated ball groove 4. The ball 23a is made to stand by at the outer peripheral surface portion near one edge portion sandwiching the groove portion at the cut point. Then, the electric slide device 20a is actuated to move the ball 2
3a to the ball groove 4 as indicated by reference numerals B to F in FIG.
To move across.

Here, the ball 23a is the same as that shown in FIGS.
As shown in FIG. 6, since it has an outer diameter considerably smaller than the groove width, such as φ2, it gradually enters the ball groove 4 as shown by B to F in FIG. Then, the ball 23a crosses the ball groove 4 while being displaced inward and outward in accordance with the shape of the arc surface forming the ball groove 4.

At this time, the displacement of the ball 23a in the radial direction (groove width direction) and the thrust direction (groove depth direction) is respectively detected by the radial direction detector 27 and the thrust direction detector 2.
8, the arc-shaped plane shape of the ball groove 4 is obtained from both detection signals.

Here, each arc locus on both sides of the ball groove 4 in the groove width direction obtained by the ball 23a has an error, and the center of the arc cannot be found as it is.

Therefore, in the next step S3, the least squares method is calculated for each arc on one side in the groove width direction. As a result, an arc having no error is calculated, and the arc shapes on both sides of the ball groove 4 contacting the ball 6 are obtained.
At the same time, the center positions R1 and R2 of the arc shape on both sides of the ball groove 4 as shown in FIG.

Thus, the groove shape at one point of each ball groove 4 is measured.

Further, in step S3, the ball 4 to be combined with the ball groove 4 is formed at each of the obtained center positions R1 and R2.
The state when (the ball of φ6) is inserted (fitted) is calculated, and the center position of the ball 6 that engages with the ball groove 4 is calculated as shown in FIG. 7 (the axis O of the fixed sheave 1). And an angle θ1, θ2 formed by a line X that intersects the groove width center of the ball groove 4 and the left and right contact positions Y1, Y2 of the ball groove 4).

Such measurement is carried out at a plurality of points on the same ball groove 4, and the shape of the ball groove 4 in the entire length direction is measured (step S4).

The measurement of the ball groove 4 is similarly performed for the remaining two ball grooves 4 (step S5).

After the measurement, the measurement result output section 32 outputs measurement data (step S6), and the measurement of the groove shape of the ball groove 4 on the shaft section 1a of the stationary sheave 1 is completed.

When measuring the deviation of the center position, φ
Φ6 from the sensor holder 23 having the two balls 23a
After replacing the sensor holder 24 with the ball 24a, the automatic measurement button 30b is pressed.

Then, the φ6 ball 24a is inserted into the ball groove 4 designated in advance, and the stationary sheave 1 makes one rotation about the axis. And
From the detection signal of the measuring device 20 at this time, the deviation between the center position of the three ball grooves 4 and the center of the grinding surface other than the grooves is measured, and the measurement data is output as in the case of the φ2 probe 23a. It Of course, using the φ6 ball 24a,
The other part may be measured.

The structure and method for measuring the groove shape of the ball groove 4 by moving the ball 23a (measuring element) having a small diameter across the ball groove 4 as described above is directly applied to each arc portion of the ball groove 4. Is sequentially and continuously detected by the ball 23a, it is possible to measure the arc shape on both sides of the ball groove 4 in contact with the ball 6 with high accuracy. In particular, since the ball 23a is moved in the direction crossing the ball groove 4,
It is structurally and methodically simple.

Moreover, since the center position of the ball 6 is measured by using the obtained arc shape, the degree of combination of the balls 6 fitted in the ball groove 4 can also be measured.

Moreover, since the same measurement is carried out at a plurality of points in the lengthwise direction of the ball groove 4, the shape of the ball groove 4 in the entire length direction can also be measured.

In the present invention, the groove shape of the ball groove 4 of the stationary sheave 1, that is, the ball groove 4 formed on the outer peripheral surface of the shaft portion 1a was measured. The groove shape of the ball groove 5 of the movable sheave 2 as shown in FIG. 9, that is, the ball groove 5 formed on the inner peripheral surface of the boss portion 2a may be measured. In this case, for example, a sensor holder formed so that the balls 23a and 24a to be the measuring elements can be inserted into the cylinder may be used.

The equipment of each part described in the embodiment is not limited to the present invention, and can be variously modified within the scope described in "Claims". For example, in one embodiment, a φ2 ball is used as the measuring element, but the present invention is not limited to this, and a φ3 ball may be used. Of course, in the embodiment, the shape of the ball groove in the sheave component of the CVT is measured, but the shape of the ball groove formed on the peripheral surface of the component other than this may be measured.

[0054]

As described above, according to the invention described in claim 1 and the invention described in claim 2 , the arcuate portions of the ball groove are directly and continuously detected by the tracing stylus, Since the arc shape of the ball groove is measured, it is possible to measure the arc shape on both sides of the groove width of the ball groove that comes into contact with the ball with high accuracy. Besides, the combination with the ball that fits in the ball groove
The degree of matching can be measured. In addition, it is simple because the probe is simply moved across the ball groove.

[0055]

[0056]

[Brief description of drawings]

FIG. 1 is a front view showing the configuration of a groove shape measuring device for a ball groove according to a first embodiment of the present invention.

FIG. 2 is a plan sectional view taken along the line AA in FIG. 1 showing a ball groove on a stationary sheave together with a small-diameter probe.

FIG. 3 is a diagram for explaining a detector structure inside the measuring device.

FIG. 4 is a flowchart for explaining a measuring method for measuring the groove shape of the ball groove.

FIG. 5 is a perspective view for explaining the movement of a small-diameter probe when performing the same measurement.

FIG. 6 is a plan sectional view of the same.

FIG. 7 is a diagram for explaining how to determine a center position of a ball that is combined with a ball groove.

FIG. 8 is a sectional view for explaining a pulley structure of a belt type CVT.

9A is a plan sectional view taken along the line BB in FIG.
(B) is sectional drawing which expands and shows the same ball spline.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fixed-side sheave (workpiece) 4 ... Ball groove 10a ... Moving table (inserting means) 20a ... Sliding device (moving means) 22 ... Sensor attachment / detachment portion 23a ... Ball of φ2 (measuring element) 27, 28 ... Radial direction detector , Thrust direction detector (detector) 30 ... Controller (arithmetic unit).

Claims (2)

(57) [Claims] 1. A groove shape measuring device for measuring an inner surface shape of a ball groove formed on a peripheral surface of a work, which is arranged so as to be pressed against the peripheral surface of the work.
A tracing stylus smaller than the groove width of the ball groove, a moving means for moving the tracing stylus in a direction traversing the ball groove, and a displacement of the tracing stylus inward and outward of the ball groove when traversing the ball groove. detector and, the arc-shaped calculates the arc shape of the inner surface of the ball grooves in accordance displacement of the detected measuring element in the detector
From the shape, find the center position of the arc shape on both sides of the ball groove.
The ball that fits in the ball groove from the center position.
A groove shape measuring device for a ball groove, comprising: an arithmetic unit that obtains a ball center position in a state corresponding to the following condition . 2. A tracing stylus is arranged so as to be pressed against the circumferential surface of a work having a ball groove formed on the circumferential surface, and the tracing stylus is arranged along a direction traversing the ball groove. Is moved, and the arc shape of the inner surface of the ball groove is calculated according to the locus of measurement in and out of the ball groove at this time, and the arc shapes on both sides of the ball groove are calculated from the arc shape.
Obtain the center position of the shape, and assemble the ball groove from the center position.
In a ball in a state corresponding to when a mating ball fits
A method for measuring the shape of a ball groove, which comprises determining a center position .