JPH083401B2 - Measuring device for key groove / notch hole position - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for measuring the positions of keyways and notch holes provided in gears, pulleys and the like.

(Prior Art) Conventionally, in order to measure the positions of keyways and dowels in gears, pulleys, etc., generally, a coordinate measuring machine is generally used to directly measure the necessary points of the object to be measured. That is, in the case of tooth reference, FIG. 11 (a), the shaft hole W ₁ first measures the internal diameter of 4 points of the shaft hole W ₁ of the workpiece W (showing measurement points by black circles) The center O ₁ of the tooth W ₂ is specified, and two points on both sides of the tooth W ₂ are measured to specify the tooth center O ₂ , thereby obtaining a reference line S ₁ passing through the _two centers O ₁ and O ₂ , and then the key by identifying the centers O _3, O ₄ by measuring the internal diameter at two positions on both sides two places or Notsuku hole W ₄ of the groove W _3, a shaft hole W ₁ of the center and each of the center O _3, O ₄ Find the passing reference lines S ₂ and S ₃ , respectively,
Specifying the end position of the reference lines S ₁ and the reference line S an angle theta ₁ of ₂ or reference lines S ₁ and key asking the angle theta ₂ of the reference line S ₃ grooves W ₃ or Notsuku hole W _4, Was doing. On the other hand, in the case of the tooth groove reference, as shown in FIG. 11 (b), the center O ₅ of the shaft hole W ₁ is determined by measuring the tooth groove center O ₅ at two positions on both sides of the tooth groove W _5. Reference line S ₄ passing through ₁ and the tooth groove center O ₅
The angle θ ₁ or θ ₂ formed by the reference line S ₂ or the reference line S ₃ obtained as described above is obtained.

(Problems to be Solved by the Invention) However, the above-described conventional measuring method using the coordinate measuring machine has the following problems.

Not only is the setup of the object to be measured troublesome, but many measurement points are required, and the measurement efficiency is poor.

In terms of maintenance and management, the coordinate measuring machine must be installed in a specific place (for example, an air-conditioned room), and in-line installation is impossible.

Since this is a measurement method in which the probe is brought into contact with the measurement value, the measurement value tends to vary due to the influence of the surface accuracy of the measured portion.

(Means for Solving Problems) In order to solve the above conventional problems, the present invention provides a gear,
A device for measuring the position of a keyway or a notch hole of a pulley or the like, the centering table having a centering head for engaging a shaft hole of an object to be measured to center the object, and the centering table. A pedestal disposed opposite to the centering head for holding the object to be measured at the centering position in cooperation with the centering head; and a tooth of the object to be measured disposed on the side of the centering table and the pedestal or An indexing table having an indexing head which engages with a tooth groove to index the object to be measured in the rotational direction, and a key groove of the object to be centered and indexed which is mounted on the receiving table. Measurement with a holding jig having a through hole whose axis is aligned with the ideal center of the knock hole, and a probe that is detachably held in the through hole of the holding jig and that engages with the key groove / knock hole The gist is that it is configured to have a gauge.

(Operation) In the key groove / knock hole position measuring device configured as described above, the object to be measured is held by the centering head and the pedestal, and the indexing head is engaged with the tooth or the groove to measure the object to be measured. Objects can be easily set up at the measurement position. Further, by merely holding the measurement gauge in the through hole of the holding jig mounted on the pedestal, it is possible to easily compare and measure the deviation of the current key groove / knock hole position from the ideal position.

(Example) Hereinafter, an example of the present invention is described based on an accompanying drawing.

In FIGS. 1 to 5, reference numeral 1 is a pedestal on which a base 2 having a convex portion 2a in the middle is fixed. Base 2
A centering stand 3 and a receiving stand 4 are arranged facing each other across the convex portion 2a, and each is fixed to the convex portion 2a by using a bolt 5. Reference numeral 6 denotes a hollow holder fitted to the centering table 3, and a shaft 8 is fitted to the holder 6 via a bearing 7 so as to be rotatable and slidable.
A cone-shaped centering head 9 having a tapered outer peripheral surface is fixed to a tip of the shaft 8 facing the receiving base 4 with a bolt 10. The centering head 9 plays a role of engaging with the shaft hole W _{1 of the} object to be measured W to center the object to be measured W, and holds the object to be measured W with the receiving table 4. it can.

A shaft hole 8a is formed in the rear end of the shaft 8 and a compression spring 11 and a push rod 12 are housed in the shaft hole 8a. A pin 13 is driven into the push rod 12 in the axial direction, and both ends of the pin 13 are exposed in an elongated hole 8b provided in the shaft 8.
That is, the push rod 12 can move relative to the shaft 8 within a range in which the pin 13 can move in the long hole 8b, whereby the forward movement of the push rod 12 causes the forward movement of the compression spring. Shaft 8 through 11
Then, the object to be measured W is transmitted to the centering head 9, and is held by the clamping force determined by the compression spring 1.
Then, one end of the first link 15 is connected to the rear end of the push rod 12 via a joint 14. Link
The column 15 has a longitudinally intermediate portion axially attached to a column 16 that is erected on the gantry 1 so that it can be swiveled in a horizontal plane, and the other end of the column 15 moves linearly following the rotation of the lever 17. Link 18 is linked. As a result, the first link 15 follows the rotation of the lever 17 and turns within the range shown by the solid line and the broken line in FIG. 1, and further follows the turning of the first link 15 to push the rod. 12 moves back and forth, and the clamped or unclamped state of the object to be measured W is selected. In addition, 19 is for temporarily placing the object to be measured W,
It is a V block installed on the convex portion 2a of the base 2.

Also, an indexing table 21 is bolted to one end of the receiving table 4.
It is fixed at 20. The indexing table 21 is provided with a main body 22 having a hole 22a, and the axis of the hole 22a is held by the centering head 9 and the receiving table 4 in a direction normal to the outer peripheral surface of the object to be measured W. Are arranged so as to match with. The main body
A shaft 24 is slidably fitted into the hole 22a of the groove 22 through a bush 23. The shaft 24 has its narrow rear end portion extended to the outside through the lid 25 attached to the rear end of the main body portion 22, and the disc-shaped stopper 26 is provided at one end extended to the outside. It is attached with bolts 27. The shaft 24 is always urged forward by a compression spring 28 arranged in the hole 22, and the tip of a screw member 29 screwed into the main body 22 is inserted into a long groove 24a provided in the peripheral portion of the shaft 24. By advancing, the forward end and the backward end are restricted (Fig. 4).

A bracket 30 is fixed to the rear end of the main body 22 of the centering table 21 with bolts 31, and a rotary body 33 is attached to the bracket 30 via a rotary shaft 32. The rotary shaft 32 and the rotary body 33 are integrated by screws 34, and the rotary shaft 32 is further integrated with a lever 35. The rotating body 33 is a claw portion 33 extending upward and downward in the shaft 24.
a with which the handle 35 is now first
When it is rotated counterclockwise in the figure, the rotating body 33 is rotated together with the rotating body 33, its claw portion 33a pushes the stopper 26, and the shaft 24 resists the urging force of the compression spring 28. You will be able to retreat to the broken line position. Then, the index head 3 having the ball portion 36a at the tip is provided at the tip of the shaft 24.
6 are mounted on top and bottom. This index head 36
As the shaft 24 advances, engages with the teeth W _{2 of the} object to be measured W held by the centering head 9 and the pedestal 4 (FIG. 5), and the direction of rotation of the object to be measured W is measured. Plays the role of indexing. At the time of this indexing, by appropriately rotating the lever 35, the urging force of the compression spring 28 is effectively transmitted to the measured object W.

Reference numeral 37 is a holding jig mounted on the receiving table 4. The holding jig 37 has a through hole 38, and the axis of the through hole 38 (the third
(Fig.) O ₀ of a key groove W ₃ or a notch hole W _{4 which} will be described later (Figs. 7 to 9) of the object to be measured centered and indexed by the centering head 9 and the indexing head 36. It is arranged to match the ideal center. The axial center of the centering head 9, that is, the axial center O ₁ of the shaft hole W ₁ of the object to be measured W is at a position considerably deviated from the axial center O ₀ of the through hole 38 (FIG. 3). ).

On the other hand, as shown in FIG. 6, the through hole of the holding jig 37.
A measuring gauge 40 held in 38 is provided separately.
The measuring gauge 40 includes a main body 41 having a shaft hole 41a, a measuring rod 43 pivotally mounted in the shaft hole 41a of the main body 41 and a measuring element 42 at the tip of a small diameter, and the main body 41. Dail gauge 44 attached to detect the displacement of the measuring rod 43
It is composed of and. The measurement rod 43 is a main body
Up and down at a fixed position (axial center position of the shaft hole 41a) by being fixed by a shaft 47 to a gate-shaped bush 46 which is fitted in the shaft hole 41a of 41 and fixed by a screw 45. Swinging is allowed. The measuring rod 43 is always tilted in one direction (the direction in which the tracing stylus 42 side is tilted downward) by the compression spring 49 externally fitted to the screw member 48 screwed to the main body 41.
On the other hand, the dial gauge 44 has its stem portion 50 fitted into the main body 41 to be in a fixed state and has its spindle 51
The tip of the is contacted with the measuring rod 43. 52
Is a stopper for restricting the excessive tilting of the measuring rod 43, and 53 is an operating rod for manually swinging the measuring rod 43. Further, 39 is a bolt for restricting the operation and rotation range of the measuring gauge 40.

Hereinafter, the operation of the measuring device having the above configuration will be described with reference to FIGS. 7 to 9. The measurement of the keyway W ₃ will be described here.

First, the lever 17 is operated to move the push rod 12 forward to engage the centering head 9 with the shaft hole W _{1 of the} object to be measured W (Fig. 7), and cooperate with the pedestal 4 to measure the object to be measured. Hold the object W. Next, operate the lever 35 on the indexing table 21 side to shift the shaft.
24 is advanced and the indexing head 36 is engaged with the tooth W _{2 of the} object to be measured W (FIG. 7) to index the object to be measured W in the rotational direction. Next, the measuring gauge 40 is inserted into the through hole 38 of the holding jig 37 of the pedestal 4. At this time, the index previously marked on the holding jig 37 and the main body 41 of the measuring gauge 40 is inserted into the target, and the orientation of the probe 42 is adjusted. At this time, the operation rod 53 is operated to measure the measurement rod including the probe 42.
Adjust the tip of 43 into the keyway W ₃ . Then, when the measuring gauge 40 is completely housed in the holding jig 37, the dial gauge 44 is read to perform the first measurement of the displacement of the measuring rod 43. When this measurement is completed, the measurement gauge 40 is inverted 180 degrees, and the second measurement is performed.

Specifically, by the centering by the centering head 9, the center O _{1 of} the shaft hole W ₁ described above (FIGS. 11A and 11B)
It is also possible to specify the reference line S ₁ that connects the center O ₁ and the tooth center O ₂ by the indexing head 9 (FIG. 7). Further, as shown in FIG. 8 and FIG. 9, the distance a between the ideal center O ₀ of the keyway W ₃ and one side surface is obtained by the first measurement, and the second measurement is performed. The distance b between the ideal center O ₀ and the other side surface is obtained. Therefore, 1/2 of the difference between the distances a and b is the center O ₃ of the key groove W ₃ of the actual object to be measured W and its ideal center O _0.
Becomes the difference, i.e. misalignment amount δ becomes a fact that can identify a reference line S ₂ passing through the center O ₁ and the center O ₃ of the keyway W ₃ of the shaft hole W ₂ with.

In the above embodiment, the biasing force of the compression springs 11 and 28 is used to center and index the object to be measured W. Therefore, even if the object to be measured W is made of a soft material, the object to be measured is The measurement can be performed without damaging W. Further, since the centering head 9 having a cone shape and the indexing head 36 having the balls 36a are used, the accuracy of centering and indexing of the object to be measured W is improved.

When the measurement is performed on the basis of the tooth space, for example, as shown in FIG. 10, an indexing head 36 'having a tapered surface may be used.

(Effects of the Invention) As described above in detail, the key groove / knock hole position measuring device according to the present invention is dedicated to an object to be measured so that it can be compared and measured with an ideal reference. As a result, no special skill is required for the measurement, and the measurement can be performed easily and accurately, and the effect that not only the measurement efficiency is improved but also the in-line measurement is possible is obtained.

[Brief description of drawings]

1 is a plan view of a key groove / knock hole position measuring device according to the present invention, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, and FIG. 3 is a view taken along arrow A of FIG. 4 and 5 are cross-sectional views of the indexing table portion which is a part of the present measuring device, and FIG. 5 is B of FIG.
FIG. 6 is a sectional view of a measuring gauge that is a part of the measuring device, FIGS. 7 to 9 are explanatory views showing the measuring principle of the measuring device, and FIG. 10 is another index head. 11 (a) and 11 (b) are schematic diagrams showing the above embodiment, and are explanatory views showing the principle of measurement by the conventional coordinate measuring machine. 3 …… Centering stand, 4 …… Reception stand 9 …… Centering head, 21 …… Indexing stand 36,36 ′ …… Indexing head, 37 …… Holding jig 38 …… Through hole, 40 …… Measuring gauge 42 …… Stylus, 43 …… Measuring rod W …… Measurement object, W ₁ …… Shaft hole W ₂ …… Tooth, W ₃ …… Key groove W ₄ …… Slot hole, W ₅ …… Tooth groove

Claims (1)

[Claims] 1. A device for measuring the positions of keyways and notch holes in gears, pulleys, etc., which has a centering head for engaging the shaft hole of the object to be measured to center the object. A stand,
A pedestal that is arranged to face the centering table and that holds an object to be measured at a centering position in cooperation with the centering head, and a pedestal that is arranged on the side of the centering table and the pedestal to be measured. An indexing table having an indexing head that engages with the teeth or tooth grooves of the object to index the object to be measured in the rotational direction, and the object to be measured that has been centered and indexed attached to the receiving table. A holding jig having a through hole in which the axis is aligned with the ideal center of the key groove / knock hole, and a measurement that is detachably held in the through hole of the holding jig and engages with the key groove / knock hole. A measuring device for measuring the position of a key groove and a notch hole, which is provided with a measuring gauge having a child.