JP2024061250A - Measuring device and measuring method - Google Patents

Abstract

[Problem] To provide a measuring device capable of easily measuring the concentricity between the virtual center of an inner peripheral surface and the virtual centers of multiple grooves. [Solution] The measuring device 100 includes multiple displacement sensors 2 for measuring the inner peripheral surface, multiple displacement sensors 3 for measuring the grooves, and a main body 1 on which the displacement sensors 2 and 3 are provided. The displacement sensors 2 are arranged at intervals in the circumferential direction, and the displacement sensors 3 are arranged at intervals in the circumferential direction, with the displacement sensors 2 and 3 arranged alternately in the circumferential direction. The main body 1 has a head 1a into which an outer ring is fitted. The measuring device 100 is configured so that, with the outer ring fitted to the head 1a, measurements are performed by the displacement sensors 2 and 3. [Selected Figure] Figure 1

Description

The present invention relates to a measuring device and a measuring method.

Conventionally, a measuring device for measuring the outer ring of a constant velocity joint is known (see, for example, Patent Document 1).

The measuring device in Patent Document 1 is configured to insert a dial gauge into the inside of the outer ring to measure the internal dimensions of the outer ring.

Patent No. 5289892

With the conventional measuring device described above, when trying to measure multiple points on the outer ring, it is necessary to change the orientation of the dial gauge, which may complicate the measurement work. In addition, there is a demand for a measuring device that can measure the concentricity between the virtual center of the inner peripheral surface of the outer ring and the virtual centers of multiple grooves formed on the inner peripheral surface of the outer ring.

The present invention has been made to solve the above problems, and the object of the present invention is to provide a measuring device and a measuring method that can easily measure the concentricity between the virtual center of the inner surface and the virtual centers of multiple grooves.

The measuring device according to the present invention measures the inner peripheral surface of the outer ring of a constant velocity joint at multiple locations, and also measures multiple grooves formed on the inner peripheral surface to measure the concentricity between the virtual center of the inner peripheral surface and the virtual centers of the multiple grooves. The measuring device includes multiple first displacement sensors for measuring the inner peripheral surface, multiple second displacement sensors for measuring the grooves, and a main body in which the multiple first displacement sensors and multiple second displacement sensors are provided. The multiple first displacement sensors are arranged at intervals in the circumferential direction, and the multiple second displacement sensors are arranged at intervals in the circumferential direction, with the first displacement sensors and the second displacement sensors arranged alternately in the circumferential direction. The main body has a fitting shaft into which the outer ring is fitted. The measuring device is configured such that, with the outer ring fitted to the fitting shaft, measurements are performed by the multiple first displacement sensors and measurements are performed by the multiple second displacement sensors.

By configuring it in this way, the outer ring is fitted onto the fitting shaft portion, and multiple points on the inner surface are measured, and multiple grooves are measured, so the concentricity between the virtual center of the inner surface and the virtual centers of the multiple grooves can be easily measured.

In the above-mentioned measuring device, a sphere and a lever are provided corresponding to each of the multiple second displacement sensors, the sphere is provided on the fitting shaft portion so as to be movable in the radial direction, the lever is provided on the main body portion so as to be tiltable, the upper end of the lever is disposed radially inside the sphere, the lower end of the lever is disposed radially inside the second displacement sensor, the first displacement sensor is disposed on the fitting shaft portion, and the second displacement sensor is disposed below the fitting shaft portion.

In a measuring device provided with the above lever, the lever may be attached to the main body via a leaf spring.

In a measuring device in which the above-mentioned leaf spring is provided, the lever may have a tilt fulcrum located at a midpoint between the upper end and the lower end.

The above measuring device may include a computer that calculates the virtual center of the inner circumferential surface from the measurement results of the multiple first displacement sensors, and calculates the virtual centers of the multiple grooves from the measurement results of the multiple second displacement sensors, and the computer may be configured to measure the concentricity based on the calculated virtual center of the inner circumferential surface and the virtual centers of the multiple grooves.

The measuring method according to the present invention measures the inner peripheral surface of the outer ring of a constant velocity joint at multiple locations, and also measures multiple grooves formed on the inner peripheral surface to measure the concentricity between the virtual center of the inner peripheral surface and the virtual centers of the multiple grooves. The measuring method includes the steps of fitting the outer ring to a fitting shaft of a measuring device, measuring the inner peripheral surface with multiple first displacement sensors circumferentially spaced apart on the measuring device while the outer ring is fitted to the fitting shaft, and measuring the multiple grooves with multiple second displacement sensors circumferentially spaced apart on the measuring device, calculating the virtual center of the inner peripheral surface from the measurement results of the multiple first displacement sensors and calculating the virtual centers of the multiple grooves from the measurement results of the multiple second displacement sensors by a computer of the measuring device, and measuring the concentricity based on the calculated virtual center of the inner peripheral surface and the virtual centers of the multiple grooves by the computer.

The measuring device and measuring method of the present invention make it easy to measure the concentricity between the virtual center of the inner surface and the virtual centers of multiple grooves.

FIG. 1 is a perspective view showing a measuring device according to an embodiment of the present invention. 2 is a cross-sectional view of the measuring device of FIG. 1 taken along a plane including a displacement sensor 3. 2 is a cross-sectional view of the measuring device of FIG. 1 taken along a plane including a displacement sensor 2. FIG. 2 is an exploded perspective view for explaining a lever of the measuring device of FIG. 1 . 2 is a view of an outer race of a constant velocity joint measured by the measuring device of FIG. 1 as viewed from the axial direction.

One embodiment of the present invention is described below.

First, the structure of a measuring device 100 according to one embodiment of the present invention will be described with reference to Figures 1 to 5.

The measuring device 100 measures the outer ring 150 (see FIG. 5) of a constant velocity joint. As shown in FIG. 5, the outer ring 150 is formed in a cylindrical shape and has an inner peripheral surface 151. Six grooves 152 are formed in the inner peripheral surface 151. The six grooves 152 are formed to extend in the axial direction and are arranged at intervals in the circumferential direction. The measuring device 100 is configured to measure the inner peripheral surface 151 at six locations and the six grooves 152 to measure the concentricity between the virtual center of the inner peripheral surface 151 and the virtual centers of the six grooves 152.

As shown in FIG. 1, the measuring device 100 includes a main body 1, six displacement sensors 2, six displacement sensors 3, and a computer (not shown). The six displacement sensors 2 and 3 are provided on the main body 1, and the measurement results of the six displacement sensors 2 and 3 are input to the computer. The displacement sensors 2 and 3 are examples of the "first displacement sensor" and "second displacement sensor" of the present invention, respectively.

The main body 1 includes a base 11, an axis member 12 (see Figs. 2 and 3), a head lower member 13, a head upper member 14, and a cylindrical member 15. The base 11 is formed in a disk shape. As shown in Figs. 2 and 3, the axis member 12 is attached to the center of the base 11 and is formed so as to extend upward from the base 11. The head lower member 13 is attached to the upper end of the axis member 12. The head upper member 14 is assembled to the upper side of the head lower member 13. The head lower member 13 and the head upper member 14 form a cylindrical head 1a into which the outer ring 150 is fitted during measurement. The cylindrical member 15 is attached to the base 11 and is arranged so as to surround the axis member 12. The head 1a is an example of the "fitting axis portion" of the present invention.

1 and 3, six displacement sensors 2 are provided to measure the inner circumferential surface 151. Specifically, the six displacement sensors 2 are provided to calculate position information D1 (see FIG. 5) at six points between the grooves 152 on the inner circumferential surface 151. That is, the six displacement sensors 2 are provided to measure the inner diameter (radius) dimensions at six points on the inner circumferential surface 151. The six displacement sensors 2 are arranged on the head 1a and spaced apart in the circumferential direction. Each displacement sensor 2 is arranged so that the probe 2a faces radially outward, and each probe 2a is arranged so that it protrudes radially outward from the outer periphery of the head 1a. For example, a differential transformer type electric micro detector or a linear gauge can be used as each displacement sensor 2.

As shown in Figs. 1 and 2, six displacement sensors 3 are provided to measure the grooves 152. Specifically, the six displacement sensors 3 are provided to calculate the center position information D2 (see Fig. 5) when six spheres 31 (described later) are fitted into the six grooves 152. That is, the six displacement sensors 3 are provided to measure the distance to the center of the six spheres 31. The six displacement sensors 3 are disposed below the head 1a and are spaced apart in the circumferential direction. The displacement sensors 2 and 3 are disposed alternately in the circumferential direction. For example, a differential transformer type electric micro detector or a linear gauge can be used as each displacement sensor 3.

Here, spheres 31 and levers 32 are provided to correspond to each of the six displacement sensors 3. The spheres 31 are separate from the levers 32 and are not connected to the levers 32. As shown in FIG. 2, the spheres 31 are provided in the accommodation chambers 16 so as to be movable in the radial direction. The accommodation chambers 16 are formed in the head 1a and are provided alternately with the displacement sensors 2 in the circumferential direction. The radial outer side of the accommodation chambers 16 is open, and the spheres 31 are exposed from the opening. The spheres 31 exposed from the opening are disposed radially outward from the measuring probe 2a of the displacement sensor 2. At the bottom of the opening, a claw portion 16a is formed to prevent the spheres 31 from falling off. In addition, the radial inner side of the accommodation chambers 16 is connected to an insertion hole 13a formed in the head lower member 13. The insertion hole 13a is formed to penetrate the head lower member 13 in the vertical direction.

The lever 32 is formed in a rod shape extending in the vertical direction, and is provided to transmit the displacement of the sphere 31 to the displacement sensor 3. The lever 32 is attached to the shaft member 12 via the leaf spring 33, and is configured to be tiltable. Specifically, as shown in FIG. 4, the shaft member 12 is formed with an attachment surface 12a. Six attachment surfaces 12a are provided so as to be connected in the circumferential direction. The leaf spring 33 has a fixed piece 33a and a movable piece 33b, and the movable piece 33b is disposed above the fixed piece 33a. In the leaf spring 33, the boundary between the fixed piece 33a and the movable piece 33b becomes the tilt fulcrum 33c. Note that, before the deformation of the leaf spring 33, the fixed piece 33a and the movable piece 33b are formed so as to be connected in a straight line.

The fixed piece 33a is fixed to the mounting surface 12a by the fixing member 34. The fixing member 34 is fastened to the mounting surface 12a by the bolt 34a. That is, the shaft portion of the bolt 34a is fastened to the bolt hole of the mounting surface 12a, so that the fixed piece 33a and the fixing member 34 are sandwiched between the head of the bolt 34a and the mounting surface 12a. The position of the fixed piece 33a and the fixing member 34 relative to the mounting surface 12a is determined by the positioning pin 34b. The movable piece 33b is attached to the lever 32 by the bolt 35a and the plate nut 35. That is, the shaft portion of the bolt 35a is fastened to the bolt hole of the plate nut 35, so that the movable piece 33b and the lever 32 are sandwiched between the head of the bolt 35a and the plate nut 35.

As shown in FIG. 2, the upper side of the lever 32 is inserted into the insertion hole 13a, and the upper end 32a of the lever 32 is disposed in the storage chamber 16. The upper end 32a of the lever 32 is disposed radially inside the sphere 31 and abuts against the sphere 31 at the reference position. The reference position is the position where the sphere 31 is located when no measurement is being performed, and is the radially outermost position within the range where the sphere 31 can move radially. At this time, the leaf spring 33 is not elastically deformed. In other words, the sphere 31 is not biased and is disposed with no gap between it and the lever 32. A space S1 is formed radially inside the upper end 32a. The space S1 is provided to allow the upper end 32a to escape when the lever 32 is tilted.

The lower side of the lever 32 is disposed between the shaft member 12 and the cylindrical member 15. The lower end 32b of the lever 32 is disposed radially inside the displacement sensor 3. The displacement sensor 3 is disposed in the notch 15a of the cylindrical member 15, and is disposed so that the probe 3a faces radially inward. The lower end 32b of the lever 32 abuts against the probe 3a. A space S2 is formed radially outside the lower end 32b. The provision of the space S2 makes it possible for the lower end 32b to press the probe 3a when the lever 32 is tilted.

The lever 32 has a tilt fulcrum 33c (see FIG. 4) located at the midpoint between the upper end 32a and the lower end 32b. That is, the distance between the height position where the lever 32 contacts the sphere 31 and the height position of the tilt fulcrum 33c is set to be the same as the distance between the height position where the lever 32 contacts the displacement sensor 3 and the height position of the tilt fulcrum 33c. Therefore, the amount of displacement of the upper end 32a and the amount of displacement of the lower end 32b when the lever 32 is tilted are set to be the same.

The computer is configured to measure the inner diameter of the inner circumferential surface 151 using the displacement sensor 2, and calculate the virtual center of the inner circumferential surface 151 based on the inner diameter. That is, the computer is configured to calculate the virtual center of the inner circumferential surface 151 from the measurement results of the six displacement sensors 2. Specifically, the position information D1 (see FIG. 5) of the inner circumferential surface 151 is calculated based on the angle of the displacement sensor 2 (the arrangement position in the measurement device 100) and the measurement result of the displacement sensor 2 (the distance from the reference position (e.g., the axial center) of the measurement device 100 to the inner circumferential surface 151). The calculation of this position information D1 is performed for each of the six displacement sensors 2, and the virtual center of the inner circumferential surface 151 (the center position of a circle passing through the six pieces of position information D1) is calculated using the six pieces of position information D1. The position information D1 is two-dimensional position information in a plane perpendicular to the axial direction of the head 1a.

The computer is also configured to measure the groove diameter ball center dimension using the displacement sensor 3, and calculate the virtual center of the groove portion 152 based on the groove diameter ball center dimension. That is, the computer is configured to calculate the virtual center of the six groove portions 152 from the measurement results of the six displacement sensors 3. Specifically, position information D2 (see FIG. 5) regarding the groove portion 152 is calculated based on the angle of the displacement sensor 3 (the arrangement position in the measurement device 100) and the measurement result of the displacement sensor 3 (the distance from the reference position (e.g., the axis center) of the measurement device 100 to the center of the sphere 31). This calculation of the position information D2 is performed for each of the six displacement sensors 3, and the virtual center of the six groove portions 152 (the center position of the circle passing through the six position information D2) is calculated using the six position information D2. Note that the position information D2 is two-dimensional position information in a plane perpendicular to the axial direction of the head 1a.

The computer is configured to measure the concentricity based on the calculated virtual center of the inner circumferential surface 151 and the virtual centers of the six grooves 152. The concentricity between the virtual center of the inner circumferential surface 151 and the virtual centers of the six grooves 152 is used, for example, to evaluate the machining accuracy of the grooves 152.

-Measuring method-
Next, the operation (measurement method) of the measurement device 100 of this embodiment will be described with reference to FIGS.

First, the outer ring 150 (see FIG. 5) of the constant velocity joint is fitted to the head 1a (see FIG. 1) of the measuring device 100. This allows the inner circumferential surface 151 of the outer ring 150 to be measured at six locations, and the six grooves 152 of the outer ring 150 to be measured.

Specifically, when the outer ring 150 is fitted to the head 1a, the inner peripheral surface 151 comes into contact with the probe 2a (see FIG. 3) of the displacement sensor 2, and the probe 2a is displaced radially inward by the inner peripheral surface 151.

When the outer ring 150 is fitted to the head 1a, the groove 152 comes into contact with the sphere 31 (see FIG. 2), which displaces the sphere 31 radially inward from the reference position. This movement of the sphere 31 tilts the lever 32 (see FIG. 2) against the biasing force of the leaf spring 33 (see FIG. 4). That is, the lever 32 is tilted around the tilt fulcrum 33c so that the upper end 32a moves radially inward and the lower end 32b moves radially outward. As a result, the lower end 32b of the lever 32 displaces the probe 3a (see FIG. 2) radially outward.

Then, the inner circumferential surface 151 is measured based on the displacement of the probe 2a, and the groove portion 152 (the center of the sphere 31) is measured based on the displacement of the probe 3a. The measurement results of the displacement sensors 2 and 3 are input to a computer (not shown).

The computer calculates the position information D1 (see FIG. 5) of the inner circumferential surface 151 based on the angle and measurement results of the displacement sensor 2. This position information D1 is calculated for each of the six displacement sensors 2, and the virtual center of the inner circumferential surface 151 is calculated using the six pieces of position information D1.

The computer also calculates position information D2 (see FIG. 5) regarding the grooves 152 based on the angles and measurement results of the displacement sensors 3. This position information D2 is calculated for each of the six displacement sensors 3, and the virtual centers of the six grooves 152 are calculated using the six pieces of position information D2.

Next, the computer measures the concentricity based on the virtual center of the inner surface 151 and the virtual centers of the six grooves 152. For example, if the concentricity is high, it is determined that the machining precision of the grooves 152 is high, and if the concentricity is low, it is determined that the machining precision of the grooves 152 is low.

When the outer ring 150 is removed from the head 1a after the measurement, the sphere 31 is returned to the reference position by the biasing force of the leaf spring 33. The probes 2a and 3a are also returned to their original positions.

-effect-
In this embodiment, as described above, the outer ring 150 is fitted to the head 1a, and thus six locations on the inner circumferential surface 151 are measured, and the six grooves 152 are also measured, making it possible to easily measure the concentricity between the virtual center of the inner circumferential surface 151 and the virtual centers of the six grooves 152. Furthermore, since the measurement of the inner circumferential surface 151 and the measurement of the grooves 152 are performed simultaneously, it is possible to improve the measurement accuracy of the concentricity.

In addition, in this embodiment, the sphere 31 and lever 32 are provided, so that the displacement sensor 3 can be positioned below the head 1a.

In addition, in this embodiment, the lever 32 is attached to the shaft member 12 via the leaf spring 33, so that the sphere 31 can be easily returned to the reference position.

In addition, in this embodiment, the tilt fulcrum 33c of the lever 32 is positioned at the middle position, so that the probe 3a can be displaced by the amount of displacement of the sphere 31.

In addition, in this embodiment, because the sphere 31 is not connected to the lever 32, the sphere 31 can easily fit into the cross-sectional shape of the groove 152, making it easier for the sphere 31 to make appropriate contact with the groove 152 at two points.

-Other embodiments-
It should be noted that the embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. Therefore, the technical scope of the present invention is not interpreted solely by the above-described embodiments, but is defined by the claims. The technical scope of the present invention includes all modifications within the scope and meaning equivalent to the claims.

For example, in the above embodiment, an example was shown in which six grooves 152 are formed on the inner peripheral surface 151 of the outer ring 150, but the number of grooves formed on the inner peripheral surface of the outer ring may be any number as long as there is more than one. In addition, the number of displacement sensors for measuring the inner peripheral surface may be any number as long as there is more than one, and the number of displacement sensors for measuring the grooves may be any number as long as there is more than one.

In addition, in the above embodiment, an example was shown in which the displacement sensor 3 for measuring the groove portion 152 was placed below the head 1a, but this is not limited thereto, and the displacement sensor for measuring the groove portion may be placed on the head.

In addition, in the above embodiment, an example was shown in which the displacement sensor 2 for measuring the inner circumferential surface 151 is placed on the head 1a, but this is not limited thereto, and the displacement sensor for measuring the inner circumferential surface may be placed below the head.

In the above embodiment, the lever 32 is attached to the main body 1 via the leaf spring 33, but the present invention is not limited to this. The lever may be rotatably provided on the main body and biased by a biasing member (not shown).

In addition, in the above embodiment, an example was shown in which the lever 32 is configured to transmit the displacement of the sphere 31 directly to the displacement sensor 3, but this is not limiting, and the lever may be configured to increase or decrease the displacement of the sphere and transmit it to the displacement sensor.

In addition, in the above embodiment, an example was shown in which the sphere 31 and the lever 32 were not connected, but this is not limiting, and the sphere and the lever may be connected. In this case, all of the multiple sets of spheres and levers may be connected, or only some of the multiple sets of spheres and levers may be connected.

The present invention can be used in a measuring device and a measuring method for measuring the outer ring of a constant velocity joint.

1 Main body portion 1a Head (fitting shaft portion)
2. Displacement sensor (first displacement sensor)
3 Displacement sensor (second displacement sensor)
31 Sphere 32 Lever 33 Leaf spring 33c Tilting fulcrum 100 Measuring device 150 Outer ring 151 Inner peripheral surface 152 Groove portion

Claims (6)

1. A measuring device for measuring an inner circumferential surface of an outer ring of a constant velocity joint at a plurality of points and a plurality of grooves formed on the inner circumferential surface to measure concentricity between a virtual center of the inner circumferential surface and virtual centers of the plurality of grooves, comprising:
A plurality of first displacement sensors for measuring the inner circumferential surface;
a plurality of second displacement sensors for measuring the grooves;
a main body portion in which the plurality of first displacement sensors and the plurality of second displacement sensors are provided,
the plurality of first displacement sensors are arranged at intervals in a circumferential direction, and the plurality of second displacement sensors are arranged at intervals in a circumferential direction, and the first displacement sensors and the second displacement sensors are arranged alternately in the circumferential direction,
the main body portion has a fitting shaft portion into which the outer ring is fitted,
a measurement device configured to perform measurements using the plurality of first displacement sensors and the plurality of second displacement sensors in a state in which the outer ring is fitted onto the fitting shaft portion. 2. The measuring device according to claim 1,
a sphere and a lever are provided corresponding to each of the plurality of second displacement sensors;
The sphere is provided on the fitting shaft portion so as to be movable in a radial direction,
the lever is tiltably provided on the main body, an upper end of the lever is disposed radially inside the sphere, and a lower end of the lever is disposed radially inside the second displacement sensor,
A measuring device, characterized in that the first displacement sensor is disposed on the fitting shaft portion, and the second displacement sensor is disposed below the fitting shaft portion. 3. The measuring device according to claim 2,
The measuring device according to claim 1, wherein the lever is attached to the main body via a leaf spring. 4. The measuring device according to claim 3,
A measuring device according to claim 1, wherein the lever has a tilt fulcrum disposed at a midpoint between an upper end and a lower end. The measuring device according to any one of claims 1 to 4,
a computer that calculates a virtual center of the inner circumferential surface from the measurement results of the plurality of first displacement sensors, and calculates a virtual center of the plurality of groove portions from the measurement results of the plurality of second displacement sensors;
The measuring device according to claim 1, wherein the computer is configured to measure concentricity based on the calculated virtual center of the inner circumferential surface and the virtual centers of the plurality of grooves. A method for measuring concentricity between a virtual center of the inner circumferential surface and a virtual center of the plurality of grooves by measuring an inner circumferential surface of an outer ring of a constant velocity joint at a plurality of locations and measuring a plurality of grooves formed on the inner circumferential surface, comprising the steps of:
fitting the outer ring to a fitting shaft portion of a measuring device;
a step of measuring the inner circumferential surface with a plurality of first displacement sensors provided at intervals in the circumferential direction on the measuring device while the outer ring is fitted onto the fitting shaft portion, and measuring the plurality of groove portions with a plurality of second displacement sensors provided at intervals in the circumferential direction on the measuring device alternately with the first displacement sensors;
calculating a virtual center of the inner circumferential surface from the measurement results of the plurality of first displacement sensors, and calculating a virtual center of the plurality of groove portions from the measurement results of the plurality of second displacement sensors, by a computer of the measuring device;
a step of measuring concentricity based on the calculated virtual center of the inner circumferential surface and the virtual centers of the plurality of grooves by the computer.

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