JPH07324901A - Measuring device of inside diameter - Google Patents

Abstract

PURPOSE:To provide a measuring device of inside diameter which is designed to improve operability and the accuracy of measurement. CONSTITUTION:A measuring piece 21 and a slider 22 fitting movably with each other in the direction intersecting perpendicularly to the direction of measurement of a distance between gage pins 14a and 14b which are brought into contact with and positioned at inside/opposite-diameter teeth 12a and 12j (the latter is not shown in the Figure) of an involute spline 13 are provided, and contact faces 27 and 29 coming into line-contact with the outer peripheral surface of the gage pins 14a and 14b are formed in the respective outside parts of the measuring piece and the slider. On the other hand, slant surfaces 28 and 30 making a length in the direction of measurement of the distance variable with relative movements are formed in the fitting surfaces of the measuring piece 21 and the slider 22, while a scale 31 and a measuring point 32 for measuring the length in the direction of measurement of the distance corresponding to positions of the mutual relative movements are formed thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner diameter measuring device for measuring the inner diameter of a spline formed on the inner surface of a hole.

[0002]

2. Description of the Related Art For example, in an automobile power transmission device, an inner diameter spline is formed in a front hub, a differential, or the like. A broach cutter is used to process the inner diameter spline, but the blade of the broach cutter may be worn away due to long-term use, and the processing size of the inner diameter spline may deviate from the specified dimensional tolerance. Therefore, the machined dimension of the machined inner diameter spline is regularly measured, and if the machined dimension of the inner diameter spline deviates from the specified dimensional tolerance, the blade of the broach cutter is greatly worn, and the blade must be replaced. There wasn't.

Conventionally, a gauge pin and a block gauge have been used as a method for measuring the processing dimension of the inner diameter spline. FIG. 7 shows a front view of a work having an inner diameter spline, which represents a conventional method for measuring an inner diameter spline, and FIG. 8 shows a perspective view thereof.

As shown in FIG. 7, an involute spline 13 composed of a large number of teeth 12a, 12b, 12c ... Is formed on the inner peripheral surface of the work 11. When confirming whether or not the involute spline 13 is machined to a specified size, the gauge pins 14a and 14b are brought into contact with the facing teeth 12a and 12j of the involute spline 13, respectively.
The distance (over pin diameter) between 4a and 14b is measured and confirmed. For example, the standard pitch circle diameter d ₀ = 25 m
In the case of an involute spline with m, the number of teeth z = 25, and the pressure angle α = 45 °, a gauge pin with a diameter D = 2 mm is used and the overpin diameter L = 21.891 mm. Then, a predetermined dimensional tolerance is set for this overpin diameter to determine the quality of the machining dimensions of the involute spline.

Conventionally, the gauge pins 14a, 1
As a method of measuring the overpin diameter of 4b, as shown in FIG. 8, gauge pins 14a, 14 are provided on the teeth 12a, 12j of the involute spline 13 facing each other, respectively.
Position so that b is in contact with the gauge pin 14
a block gauge 101 having a different thickness between a and 14b,
102, 103 ... Are sequentially inserted. Then, the over-pin diameter is measured by summing the thicknesses of all the block gauges inserted between the gauge pins 14a and 14b.

[0006]

However, in the above-described conventional method for measuring the overpin diameter, the operator holds the tooth pins 12a, 12j of the involute spline 13 in contact with the tooth pins 12a, 12j and holds them. A block gauge 1 is provided between the gauge pins 14a and 14b.
01, 102, 103, etc. must be inserted one after another, and the work is troublesome, and the block gauge must be replaced many times in order to match the dimensions, and the work time also becomes long. There was a problem. Furthermore,
When the block gauge is inserted between the gauge pins 14a and 14b, the insertion state is due to the operator's hand feeling, and there is a problem that a proper measurement of the overpin diameter cannot be obtained depending on the operator. There was also.

The present invention solves such a problem, and an object of the present invention is to provide an inner diameter measuring instrument which is improved in workability and measurement accuracy.

[0008]

An inner diameter measuring device of the present invention for achieving the above object is an inner diameter measuring device for measuring a distance between opposed measuring surfaces, wherein a distance measuring direction between the opposed measuring surfaces is measured. Has a pair of measuring pieces that are movably fitted to each other in a direction orthogonal to, while contact portions are formed on the outer side portions of the pair of measuring pieces that respectively contact the opposing measuring surfaces, An inclined surface whose length in the distance measuring direction is variable by relative movement of the pair of measuring pieces is formed on the mutual fitting surfaces of the pair of measuring pieces, and the pair of measuring pieces have mutual slanting surfaces. It is characterized in that a measuring section for measuring the length in the distance measuring direction corresponding to the relative movement position is formed.

Further, the inner diameter measuring device of the present invention is an inner diameter measuring device for measuring a distance between gauge pins of a predetermined diameter positioned so as to respectively contact opposite inner diameter teeth of an inner diameter spline. A pair of measuring pieces that are movably fitted to each other in a direction orthogonal to the distance measuring direction are provided, and a contact surface that makes line contact with the outer surface of the gauge pin is formed on each outer side of the pair of measuring pieces. An inclined surface whose length in the distance measuring direction is variable by relative movement of the pair of measurement pieces is formed on the mutual fitting surfaces of the pair of measurement pieces, and The measuring unit for measuring the length in the distance measuring direction corresponding to the relative movement position of is formed.

[0010]

The length of the measuring piece in the distance measuring direction is increased by inserting the pair of measuring pieces between the opposed measuring surfaces and moving the pair of measuring pieces relative to each other. Then, each contact portion of each measurement piece is brought into contact with the opposing measurement surface,
At this time, the distance between the opposing measurement surfaces is measured by measuring the relative movement positions of the measurement parts of the pair of measurement pieces. Since the inclined surfaces are formed on the mating surfaces of the pair of measuring pieces in this manner, the length of the measuring pieces in the distance measuring direction can be minutely changed with respect to the relative movement amount of each measuring piece. Therefore, it is possible to easily and accurately measure in a short time.

When measuring the dimension of the inner diameter spline, the distance between the gauge pins of a predetermined diameter mounted on the inner diameter teeth facing each other may be measured. Increase the length of the measuring piece in the distance measuring direction by moving the pieces relative to each other, and measure the relative movement position of each other by the measuring part of each measuring piece when each contact part touches the outer peripheral surface of the gauge pin. At, the distance between the gauge pins is measured.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an inner diameter measuring device according to an embodiment of the present invention, FIG. 2 is a front view of the inner diameter measuring device of this embodiment, and FIG. 3 is a rear view of the inner diameter measuring device of this embodiment. 4 shows a side view of the inner diameter measuring instrument of the present embodiment, and FIG. 5 shows the outline of the operation explanation showing the method of measuring the overpin diameter by the inner diameter measuring instrument of the present embodiment. It should be noted that the members having the same functions as those of the related art are designated by the same reference numerals, and the duplicate description will be omitted.

As shown in FIGS. 1 to 4, the inner diameter measuring device 20 of the present embodiment has an involute spline 13 formed by a large number of teeth 12a, 12b, 12c ... Formed on the inner peripheral surface of the work 11. , The distance between the gauge pins 14a and 14b mounted on the teeth 12a and 12j of the involute spline 13 facing each other, that is,
The diameter of the overpin is measured, and the inner diameter measuring device 20 includes a measuring piece 21 and a slider 22 which are movably fitted to each other.

The measuring piece 21 includes a body 23 and three bolts 24.
The pressing plate 25 is integrally fixed to form a U-shape, and a fitting recess 26 is formed. The outer surface of one side of the measuring piece 21 is a flat contact surface 27 so as to make line contact with the outer peripheral surface of the gauge pin 14a (14b).
The bottom surface of the fitting recess 26 is flat and the contact surface 27
On the other hand, the inclined surface 28 changes at a slight angle in the longitudinal direction. On the other hand, the slider 22 has a square rod shape,
It is fitted in the fitting recess 26 of the measuring piece 21 and is movable in the longitudinal direction. The outer surface of one side of the slider 22 is a contact surface 29 formed flat so as to make line contact with the outer peripheral surface of the gauge pin 14b (14a), and the outer surface of the other side is flat and contact surface 29. On the other hand, the inclined surface 30 changes at a slight angle in the longitudinal direction. The angles are the same as those of the inclined surfaces 28 and 30.

Therefore, the measuring piece 21 and the slider 22 are fitted to each other so that the inclined surfaces 28 and 30 of the measuring piece 21 are in contact with each other, and the inner diameter measuring device 20 is moved by the relative movement of the measuring piece 21 and the slider 22. The entire width W, that is, the length in the distance measuring direction is changed. Further, as a measuring unit, a scale 31 is engraved on the measurement piece 21, while a measurement point 32 is engraved on the slider 22. By reading the position of the measurement point 32 with respect to the scale 31, it is possible to measure the relative position of each other. The moving position, that is, the width W of the entire inner diameter measuring device 20 can be measured.

Here, the inside diameter measuring device 2 of the above-mentioned embodiment is described.
Gauge pins 14a, 14b mounted on the opposite teeth 12a and 12j of the involute spline 13 using 0
A case of measuring the distance between them and the overpin diameter will be described.

First, as shown in FIG.
And the slider 22 are vertically displaced to reduce the width W of the inner diameter measuring device 20 as a whole, the inner diameter measuring device 20 is attached to the work 1
It is inserted between the two gauge pins 14a and 14b attached to the involute spline 13 of No. 1. And
As shown in FIG. 5B, the measuring piece 21 and the slider 22 of the inner diameter measuring instrument 20 are moved relative to each other to increase the width W of the entire inner diameter measuring instrument 20. Then, the contact surfaces 27 and 29 of the measuring piece 21 and the slider 22 are respectively attached to the gauge pins 14a and 14a.
The measurement piece 21 and the slider 22 are stopped from moving relative to each other by contacting the outer peripheral surface of b. At this time, as shown in FIG. 5C, the measuring points 32 of the slider 22 with respect to the scale 31 of the measuring piece 21.
By measuring the position of, the relative movement position of each other, that is, the width W of the entire inner diameter measuring device 20 can be measured,
This width W is the distance between the gauge pins 14a and 14b.

As described above, according to the inner diameter measuring device 20 of this embodiment, since the inclined surfaces 28 and 30 are formed on the fitting surfaces of the measuring piece 21 and the slider 22, respectively, the relative movement amount of both is increased. On the other hand, the width W of the entire inner diameter measuring device 20, that is,
The length in the distance measuring direction can be minutely changed, the overpin diameters of the gauge pins 14a and 14b can be measured easily and in a short time, and the measurement accuracy can be made highly accurate.

In the above-described embodiment, the gauge pin 14 is attached to the facing teeth 12a and 12j of the involute spline 13.
The case where the a and 14b are mounted and the overpin diameter of the gauge pins 14a and 14b is measured using the inner diameter measuring device 20 has been described.
The a and 14b may be integrally provided.

FIG. 6 is a perspective view showing an inner diameter measuring device according to another embodiment of the present invention. As shown in FIG. 6, the inner diameter measuring device 40 of this embodiment comprises a measuring piece 41 and a slider 42, and the measuring piece 41 is integrally formed in a U-shape to form a fitting recess 43. An arcuate contact surface 44 that contacts the tooth 12a of the involute spline 13 is formed on one side of the measurement piece 41, and an inclined surface 45 that changes at a slight angle in the longitudinal direction is formed on the bottom surface of the fitting recess 43. Are formed. On the other hand, the slider 42 has a T-shape, is fitted in the fitting recess 43 of the measuring piece 41, and is movable in the longitudinal direction. An arc-shaped contact surface 46 that contacts the teeth 12b of the involute spline 13 is formed on one side of the slider 42, and an inclined surface 47 that changes at a minute angle in the longitudinal direction is formed on the other side. ing.

The measuring piece 41 and the slider 42 are fitted to each other so that the inclined surfaces 45 and 47 contact each other, whereby the inner diameter measuring device 40 is moved by the relative movement of the measuring piece 41 and the slider 42. The entire width W, that is, the length in the distance measuring direction is changed. A scale 48 is engraved on the measuring piece 41, while a slider 42
A measurement point 49 is engraved on the surface of the inner diameter measuring device 40. By reading the position of the measurement point 49 with respect to the scale 48, the relative movement position of each other, that is, the width W of the entire inner diameter measuring device 40 can be measured.

As described above, according to the inner diameter measuring device 40 of this embodiment, the arc-shaped contact surfaces 44 and 46 which contact the teeth 12a and 12B of the involute spline 13 are formed on the outer side of the measuring piece 41 and the slider 42. , This measuring piece 41
Slanted surfaces 28,
With the formation of 30, the two gauge pins 14a, 1
4b is not necessary, and the distance corresponding to the overpin diameter of the gauge pins 14a and 14b can be measured easily and in a short time, and the work becomes easy.

In the above-described embodiment, the gauge pins 14a and 14b are provided separately or integrally with the inner diameter measuring device. However, the gauge pins 14a and 14b are individually set according to the shape of the involute spline 13. However, a plurality of types of gauge pins 14a and 14b having different shapes may be detachably provided to the inner diameter measuring instrument, which improves the versatility of the component.

Further, the overpin diameter of the involute spline 13 differs depending on the size of the workpiece 11. For example, in the inner diameter measuring device 20 including the measuring piece 21 and the slider 22 of the above-described embodiment, the measuring piece 2 is used.
By preparing a plurality of types of sliders having different widths with respect to 1, the versatility of parts is improved.

[0026]

As described above in detail with reference to the embodiments, according to the inner diameter measuring instrument of the present invention, a pair of movably fitted in the direction orthogonal to the distance measuring direction between the measuring surfaces facing each other. The measurement piece is provided, and the contact portions that contact the measurement surfaces facing the respective outer side portions of the pair of measurement pieces are formed, respectively, while the pair of measurement pieces have a relative mating surface relative to each other. By forming an inclined surface whose length in the distance measuring direction is variable by movement, and forming a measuring unit for measuring the length in the distance measuring direction corresponding to the relative movement position of each other, a pair of measuring pieces is formed. By relatively moving the measuring piece of, the entire width of the inner diameter measuring device, that is, the length in the distance measuring direction can be minutely changed, and the distance between the opposed measuring surfaces can be measured easily and in a short time. Therefore, the measurement accuracy can be made highly accurate. As a result, workability and measurement accuracy can be improved.

Further, according to the inner diameter measuring device of the present invention, in the inner diameter measuring device for measuring the distance between the gauge pins positioned so as to contact the inner diameter teeth of the inner diameter spline facing each other, the distance between the opposite gauge pins is measured. A pair of measuring pieces that are movably fitted to each other in the direction orthogonal to the direction are provided, and contact surfaces that make line contact with the outer surface of the gauge pin are formed on the outer sides of the pair of measuring pieces, respectively. Forming an inclined surface on the fitting surface of which the length in the distance measuring direction is variable by relative movement of the pair of measuring pieces, and
Since a pair of measuring pieces is formed with a measuring unit for measuring the length in the distance measuring direction corresponding to the relative movement position of each other, the width of the entire inner diameter measuring instrument by relatively moving the pair of measuring pieces, that is,
By minutely changing the length in the distance measuring direction, the distance between the facing gauge pins can be measured easily and in a short time, and the dimensional accuracy of the inner diameter spline can be reliably measured.

[Brief description of drawings]

FIG. 1 is a perspective view showing an inner diameter measuring device according to an embodiment of the present invention.

FIG. 2 is a front view of an inner diameter measuring instrument according to the present embodiment.

FIG. 3 is a back view of the inner diameter measuring instrument according to the present embodiment.

FIG. 4 is a side view of the inner diameter measuring instrument according to the present embodiment.

FIG. 5 is a schematic view for explaining the operation of the method for measuring the overpin diameter by the inner diameter measuring device according to the present embodiment.

FIG. 6 is a perspective view showing an inner diameter measuring device according to another embodiment of the present invention.

FIG. 7 is a front view of a work on which an inner diameter spline is formed, which represents a conventional method for measuring an inner diameter spline.

FIG. 8 is a perspective view showing a state of measuring an inner diameter spline.

[Explanation of symbols]

 11 Work 12a, 12b, 12c ... 12j ... Tooth 13 Involute spline 14a, 14b Gauge pin 20 Inner diameter measuring instrument 21 Measuring piece 22 Slider (measuring piece) 27, 29 Contact surface 28, 30 Inclined surface 31 Scale (measurement part) 32 measuring point (measuring section) 40 inner diameter measuring instrument 41 measuring piece 42 slider (measuring piece) 44, 46 contact surface 45, 47 inclined surface 48 scale (measuring section) 49 measuring point (measuring section)

Claims (2)

[Claims] 1. An inner diameter measuring instrument for measuring a distance between opposed measuring surfaces, comprising a pair of measuring pieces movably fitted to each other in a direction orthogonal to a distance measuring direction between the opposed measuring surfaces, Contact portions are formed on the outer side portions of the pair of measuring pieces to contact the opposing measuring surfaces, respectively, while the mating surfaces of the pair of measuring pieces are provided with relative contact of the pair of measuring pieces. An inclined surface whose length in the distance measuring direction is variable by movement is formed, and a measuring unit for measuring the length in the distance measuring direction corresponding to the relative movement position of each other is formed on the pair of measuring pieces. An inner diameter measuring instrument characterized in that 2. An inner diameter measuring device for measuring a distance between gauge pins having a predetermined diameter, which are positioned so as to come into contact with opposed inner diameter teeth of the inner diameter spline, respectively, in a direction orthogonal to a distance measuring direction between the opposed gauge pins. A pair of measuring pieces that are movably fitted to each other are provided, and contact surfaces that are in line contact with the outer surfaces of the gauge pins are formed on the outer sides of the pair of measuring pieces, respectively. An inclined surface whose length in the distance measuring direction is variable by the relative movement of the pair of measuring pieces is formed on the fitting surface of
An inner diameter measuring instrument, wherein the pair of measuring pieces is provided with a measuring portion for measuring a length in the distance measuring direction corresponding to a relative moving position of each other.