Control device for gear measuring apparatus

Abstract

To provide a control device for a gear measuring device capable of accurately measuring a depth position of a tooth space of a gear.SOLUTION: A control device for a gear measurement device that measures a depth position of a tooth groove of a gear by bringing a probe into contact with a tooth groove of the gear, the control device comprising: a first measurement unit configured to measure a plurality of depth positions of the tooth groove shifted by a first predetermined amount in a tooth row direction in which teeth of the gear are arranged, the first predetermined amount being smaller than a width of the tooth groove in the tooth row direction; A selection unit configured to select a deepest position among the plurality of depth positions measured by the second measurement unit as a final depth position of the tooth groove.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a control device for a gear measuring device. [Background technology]

[0002] A gear measuring device that measures the position of each point on a gear is known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5255012 Summary of the Invention [Problem to be solved by the invention]

[0004] The depth position of a gear tooth gap may vary depending on the position in the tooth row direction. For this reason, when measuring the depth position of a tooth gap, there is a risk that the measured depth position of the tooth gap will be shallower than the actual depth position.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a control device for a gear measuring device that can measure the depth position of a gear tooth groove with high accuracy. [Means for solving the problem]

[0006] The above object can be achieved by a control device for a gear measuring device that measures depth positions of tooth grooves of a gear by bringing a measuring probe into contact with the tooth grooves, the control device for a gear measuring device comprising: a first measurement unit that measures a plurality of depth positions of the tooth grooves that are shifted in a tooth row direction in which the teeth of the gear are arranged by a first predetermined amount that is smaller than the width of the tooth grooves in the tooth row direction; a second measurement unit that measures a plurality of depth positions on the tooth grooves that are shifted in the tooth row direction from the deepest of the plurality of depth positions measured by the first measurement unit by a second predetermined amount that is smaller than the first predetermined amount; and a selection unit that selects the deepest of the plurality of depth positions measured by the second measurement unit as the final depth position of the tooth groove. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a control device for a gear measuring device that can measure the depth position of a gear tooth groove with high accuracy. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 shows the schematic configuration of a gear measuring device. [Figure 2] 2A and 2B are explanatory diagrams of measurement control. [Figure 3] FIG. 3 is a schematic diagram of a gear measuring device according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] FIG. 1 shows a schematic configuration of a gear measuring device 1. FIG. 1 shows the mutually perpendicular X-axis, Y-axis, and Z-axis directions. The Z-axis direction is vertical. The X-axis and Y-axis directions are horizontal. The gear measuring device 1 includes a base 10, a support member 20, a cylinder 30, a probe 40, a rotating table 50, and a controller 100. The support member 20 is disposed on the base 10. The cylinder 30 is fixed to the support member 20 at a predetermined height. The probe 40 extends in the X-axis direction from the cylinder 30. The probe 40 is supported on the cylinder 30 so as to be slidable in the X-axis direction. The cylinder 30 is provided with an X-axis actuator for sliding the probe 40 in the X-axis direction. The cylinder 30 is also provided with a sensor for detecting the coordinate position of the probe 40 in the X-axis direction. The probe 40 is an example of a measuring element. The rotating table 50 is provided on the base 10 so as to be rotatable about R. A rotary actuator that rotates the rotary table 50 and a sensor that detects the rotational position of the rotary table 50 are provided within the base 10. An external gear 200, which is the object to be measured, is placed on the rotary table 50. The height position of the cylinder 30 is set so that the probe 40 faces the external gear 200 placed on the rotary table 50 in the X-axis direction. The external gear 200 is disk-shaped, and has a plurality of teeth 210 arranged circumferentially on its outer circumferential surface.

[0010] The controller 100 is electrically connected to the above-mentioned actuators and sensors. The controller 100 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an HDD (Hard Disk Drive). The controller 100 controls the above-mentioned actuators based on information pre-stored in the ROM, in accordance with a measurement program pre-stored in the HDD. The controller 100 also acquires detection values ​​from the above-mentioned sensors, which allow the controller 100 to measure the depth positions of the tooth grooves of the external gear 200. Specifically, the controller 100 executes measurement control to measure the depth positions of the tooth grooves of the external gear 200 using a first measurement unit 101, a second measurement unit 102, and a selection unit 103, which are functionally realized by the controller 100. The controller 100 is an example of a control device for the gear measuring device 1.

[0011] Next, measurement control performed by the controller 100 will be described. In the measurement control, measurement by the first measuring unit 101, measurement by the second measuring unit 102, and selection by the selecting unit 103 are performed. Measurement by the first measuring unit 101 will be described. Figures 2A and 2B are explanatory diagrams of measurement control. Figure 2A shows the measurement method by the first measuring unit 101. Figure 2A is a diagram showing the positional relationship between the probe 40 and the tooth grooves 220 of the external gear 200 as viewed vertically from above. Multiple teeth 210 of the external gear 200 are arranged along D. The tooth grooves 220 are located between adjacent teeth 210.

[0012] The first measuring unit 101 of the controller 100 rotates the turntable 50 by one-fourth of the width W of the tooth groove 220, bringing the tip of the probe 40 into contact with the tooth groove 220 each time, and measures multiple X coordinate positions on the tooth groove 220 as depth positions of the tooth groove 220. That is, the first measuring unit 101 measures four depth positions of the tooth groove 220 at equal intervals of D. The depth positions measured in this way and the corresponding rotational angle positions of the turntable 50 are stored in the memory of the controller 100 in association with each other. The width W is previously stored in the memory of the controller 100 by an input operation by the operator.

[0013] The example of FIG. 2A shows positions Pa to Pd of the probe 40 relative to the tooth groove 220. Position Pb is the position of the probe 40 when the turntable 50 is rotated clockwise by W / 4 from position Pa. Position Pc is the position of the probe 40 when the turntable 50 is rotated clockwise by W / 4 from position Pb. Position Pd is the position of the probe 40 when the turntable 50 is rotated clockwise by W / 4 from position Pc. The deepest position among the depth positions measured at each of positions Pa to Pd is the depth position measured at position Pc. W / 4 is an example of a first predetermined amount.

[0014] Next, measurement by the second measuring unit 102 will be described. Fig. 2B shows a measurement method by the second measuring unit 102. The second measuring unit 102 rotates the turntable 50 by 1 / 20 of the width W of the tooth groove 220 from the deepest depth position measured by the first measuring unit 101, bringing the tip of the probe 40 into contact with the tooth groove 220 each time, and measures multiple X coordinate positions on the tooth groove 220 as depth positions of the tooth groove 220. The depth positions measured in this way and the corresponding rotational angle positions of the turntable 50 are stored in the memory of the controller 100 in association with each other.

[0015] The example of FIG. 2B shows positions Pc0, Pc+1, Pc+2, Pc-1, and Pc-2 of the probe 40. Position Pc0 is the position Pc shown in FIG. 2A. Position Pc+1 is the position of the probe 40 when the turntable 50 is rotated counterclockwise by W / 20 from position Pc0. Position Pc+2 is the position of the probe 40 when the turntable 50 is rotated counterclockwise by W / 20 from position Pc+1. Position Pc-1 is the position of the probe 40 when the turntable 50 is rotated clockwise by W / 20 from position Pc0. Position Pc-2 is the position of the probe 40 when the turntable 50 is rotated clockwise by W / 20 from position Pc-1. The deepest depth position among the depth positions measured at positions Pc0, Pc+1, Pc+2, Pc-1, and Pc-2 is the depth position measured at position Pc+1.

[0016] The selection unit 103 selects the depth position at the position Pc+1 where the deepest position is measured as the final depth position of the tooth groove 220. W / 20 is an example of the second predetermined amount. As described above, the depth position of the tooth groove 220 is measured in two stages. Therefore, the depth position of the tooth groove 220 is measured with high accuracy. Furthermore, by inputting the width W into the controller 100 by an operator's operation, the controller 100 automatically measures the depth position of the tooth groove 220. Therefore, the depth position of the tooth groove 220 can be measured with high accuracy in a short time compared to, for example, a case where an operator visually identifies the deepest point of the tooth groove 220 and measures that point with the probe 40.

[0017] 3 is a schematic diagram of a gear measuring device 1A of a modified example. A lifting member 25A is provided on a support member 20A so that it can move up and down in the Z-axis direction. Specifically, a Z-axis actuator is provided on the support member 20A to move the lifting member 25A in the Z-axis direction. A cylinder 30A is fixed to the lower part of the tip of the lifting member 25A. A probe 40A is supported on the cylinder 30A so that it can slide in the X-axis direction. An X-axis actuator is provided on the cylinder 30A to slide the probe 40A in the X-axis direction.

[0018] The internal gear 200A is formed in an annular shape and has a plurality of teeth on its inner peripheral surface. The controller 100A controls the actuator described above to measure the depth positions of the tooth grooves of the internal gear 200A using the method described above. In this way, the gear measuring device 1A accurately measures the depth positions of the tooth grooves of the internal gear 200A.

[0019] In the above embodiment and modified example, the first predetermined amount is set to W / 4 and the second predetermined amount is set to W / 20, but the first and second predetermined amounts are not limited to this as long as the second predetermined amount is smaller than the first predetermined amount.

[0020] In the above embodiment and modified example, the case where the depth positions of the tooth grooves of the external gear 200 and the internal gear 200A whose tooth rows are circular is measured has been described, but the gears to be measured are not limited to this. For example, the gears to be measured may be helical gears, cross gears, double helical gears, hypoid gears, etc.

[0021] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist of the present invention as defined in the claims. [Explanation of symbols]

[0022] 1. 1A Gear Measuring Device 40 Probe (measuring element) 50 Rotating Platform 100, 100A Controller (controller, first measuring unit, second measuring unit, selection unit) 200 External gear (gear) 200A Internal gear (gear) 210 teeth 220 tooth space D. Direction of tooth row W width

Claims

[Claim 1] A control device for a gear measuring device that measures a depth position of a tooth groove by bringing a probe into contact with the tooth groove of a gear, a first measuring unit that measures a plurality of depth positions of the tooth grooves that are shifted by a first predetermined amount in a tooth row direction in which the teeth of the gear are arranged, the first predetermined amount being smaller than the width of the tooth grooves in the tooth row direction; a second measuring unit that measures a plurality of depth positions on the tooth groove that are shifted in the tooth row direction by a second predetermined amount that is smaller than the first predetermined amount from the deepest position of the plurality of depth positions measured by the first measuring unit; a selection unit that selects the deepest position among the plurality of depth positions measured by the second measurement unit as a final depth position of the tooth groove; A control device for a gear measuring device comprising:

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