JPH062083Y2 - Measuring device for narrow groove width - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention has a narrow groove into which a snap ring is inserted and which has a shape such that a measurement standard is difficult to take, such as a cardan joint used for a propeller shaft joint of an automobile. The present invention relates to a narrow groove width measuring device suitable for highly accurately measuring the narrow groove in a member formed with.

[Prior Art] Conventionally, various measuring devices for measuring a narrow groove width between facing finishing side surfaces have been devised, for example, a reference pin or a reference piece is inserted in a premises, or a reference surface of the object to be measured is the finishing side surface. There is a method in which the groove width is determined from this difference by measuring the respective dimensions up to, and a method in which the groove width is directly measured by a measuring instrument such as a caliper.

In addition, there is also a method in which the groove width portion is enlarged and administered, and this is optically measured.

[Problems to be Solved by the Invention] As shown in FIGS. 2 and 4, in a component such as a cardan joint of a propeller shaft of an automobile, it is formed between a yoke 10 and a cup 11 fitted in this hole. When measuring the narrow groove 1 (shown by the width dimension b), a step of dimension a is formed between the outer edge of the finished side surface 12 of the yoke 10 and the outer periphery of the cup 11, and the inclined surface is formed on the cup 11 side. Since 14 is provided, as described above, it is extremely difficult to measure with the reference pin or the reference piece and the dimension b with a caliper, etc., and high-precision measurement is impossible.

Further, since the cardan joint has no reference surface parallel to the finished side surfaces 12 and 13, and there is almost no measurement area in contact with a gauge head such as a dial gauge, it is difficult to perform high-precision measurement. Furthermore, the optical method requires not only a lot of time for measurement setup but also high precision measurement cannot be obtained.

It is generally difficult to precisely measure the groove width of not only the cardan joint but also those having a similar shape. Particularly, in the case of a narrow groove having a groove width of about 1.5 mm, it becomes extremely difficult due to damage or bending of the probe.

The present invention is intended to solve the above-mentioned conventional problems, and enables the size of a narrow groove formed in a member having a difficult measurement reference surface to be measured with high accuracy and easily. An object of the present invention is to provide a groove width measuring device.

[Means for Solving the Problems] In a measuring device for measuring the interval dimension of the narrow groove between the finished side surfaces formed facing each other in the member whose measurement reference surface is difficult to be taken, the measuring device is insertable into the narrow groove. A stylus whose tip portion abuts on one of the finishing side surfaces, a measuring head which engages with the stylus tip to detect the amount of displacement of the tip portion in the narrow groove width direction, and a reference surface which abuts on the other of the finishing side surfaces. An abutting member having, and the probe, the measuring head, and the abutting member are held, and the tip portion of the probe is positioned on the one finished side surface,
The abutting member is positioned on the other finishing side surface which is offset and opposed to the one finishing side surface, and a floating mount is provided on the immovable side of the apparatus, which is directly and rotationally movable and oscillatable. This is solved by a narrow groove width measuring device characterized by being provided.

[Operation] While the reference surface of the floating mount is in contact with one of the finishing side surfaces of the narrow groove, the floating mount is linearly and rotationally moved and swung with respect to the stationary side of the device by its own weight, The tip portion of the probe is smoothly brought into contact with and engaged with the measurement point. By the above operation, the tip portion is positioned at a position apart from the reference surface by a predetermined dimension, but when the actual dimension of the narrow groove is different from the predetermined dimension, the tip portion is displaced in the groove width direction. . By measuring the displacement amount with the inspection head and the control unit, the actual groove width dimension can be measured with high accuracy.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the measuring device for the narrow groove 1 of the cardan joint will be described, but the object to be measured is not limited to the cardan joint.

FIG. 1 shows the overall structure of the measuring device. The tracing stylus 2 is connected to a measuring head 4 via a lever mechanism 3, and the tracing stylus 2 and the measuring head 4 are held on a floating mount 5. The floating mount 5 includes a rotating head 6 for fixing the probe 2 and the inspection head 4, a rotating shaft 7 connected to the rotating head 6, an arm 8 for supporting the rotating shaft, and an arm 8 for the head 25 of the apparatus. It is composed of a support shaft 9 which is swingably supported and a work support portion 16 having an abutting fitting 23 which will be described later.

The holding member 31 that holds the support shaft 9 is supported so as to be linearly movable along the axes of the guide bars 32 and 33 installed on the head 25. The head 25 is a column 26 which is the stationary side of the device.
The column 26 is limited to the base 27 so that the column 26 is slidably supported in the vertical direction in the figure. The weight of the head 25 is canceled by a balancing weight 28.

The cardan joint 17, which is the object to be measured, is placed on the pallet jig 29 via the support table 18, and the pallet jig 29 is mounted on the base table 27.
It is supported by a table base 30 placed on it so as to be movable in the left-right direction in FIG. 1, and is positioned by a locate pin.

The tracing stylus 2 is made of a thin plate which can be inserted into the narrow groove 1 at the tip side, and as shown in FIG. 4, the tip portion 19 is formed in an arc shape so as to make point contact with the finishing side surface 13. As shown in FIG. 3, it is arranged at the center of the V groove 20 of the work holding portion 16 formed below the rotary head 6. Further, a lever mechanism 3 is connected to the tracing stylus 2 as shown in FIGS. 5 and 6. The lever mechanism 3 and the inspection head 4 are publicly known, and the details of the lever mechanism 3 will be omitted.
Small movement (displacement amount) of the tip portion 19 of the probe 2 in the groove width direction
Is transmitted to the inspection head 4. Inspection head 4
Is a built-in strain meter, which is configured to convert the displacement amount of the tracing stylus 2 transmitted via the lever mechanism 3 into an electric signal, and input the signal to the displacement amount display means though not shown. To be done.

The rotary head 6 of the floating mount 5 is formed of a T-shaped block member, and the lever mechanism 3 and the inspection head 4 are provided on the left and right of the central columnar member 21, and these are fixed to the upper member 22. The rotary shaft 7 is connected to the upper member 22 as shown in FIG.
Further, the work supporting portion 16 is provided at the lower end of the columnar member 21, and the work supporting portion contacts the outer periphery of the cup 11 to position the work supporting portion 16 with respect to the cup 11. The V-shaped groove 20, the contact metal fitting 23 formed in the V-shaped groove and having a width narrower by 0.1 mm to 0.3 mm than the width dimension L (FIG. 2) of the finished side surface 12, and the open end side of the V-shaped groove 20. It is formed of a guide member 15 and the like fixed to the.

As shown in FIG. 5, the abutment metal fitting 23 is positioned by bringing the reference surface 24 into contact with either of the finished side surfaces 12 by finely moving the rotary head 6 in the directions C and D as viewed by the actuator 35. Is. As shown in FIG. 4, the tracing stylus 2 comes into contact with the finishing side surface 13 by moving the actuator 34 (FIG. 5) of the lever mechanism 3 in the direction of the arrow A in the contact state of the contact fitting 23, By moving the actuator 34 in the direction of arrow B, it is separated from the finishing side surface 13 as shown by the chain double-dashed line in FIG.

The guide member 15 engages with the narrow groove 1 before the probe 2 is inserted into the narrow groove 1, and the narrow groove 1 serves as a cup 11.
This is to prevent damage to the tracing stylus 2 when it is not formed on the side.

Next, the operation of this embodiment will be described.

First, the cardan joint 17 is supported in a predetermined posture in a supporting table 18
Then, the pallet jig 29 is loaded and moved in the left-right direction from the outside of the apparatus, and the narrow groove 1 of the cardan joint 17 is relatively positioned at the position of the probe 2.

After that, the floating mount 5 is engaged with the cardan joint 17 by its own weight while moving the head 25 in the vertical direction. At this time, since the floating mount 5 is swingably supported around the support shaft 9 and rotatably supported around the rotation shaft 7, the V groove 20 is naturally engaged with the outer periphery of the cup 11. .

Next, the holding member 31 is moved to press the reference surface 24 of one of the contact fittings 23 against the finishing side surface 12 of the yoke 10, and the actuator 34 of the lever mechanism 3 is operated as described above to finish the contact point 2 on the finishing surface. Abut on 13. Reference surface of abutment bracket 23
Since the dimension from the reference surface 24 to the tip 19 of the probe 2 is constant, the amount of movement of the tip 19 of the probe 2 contacting the finishing side surface 13 is measured by the inspection head 4. The width dimension b shown in FIG. 4 can be measured and measured.

As described above, this example is different from the conventional measurement,
Since a thin plate-shaped probe 2 can be inserted into the narrow groove 1 and the contact hole can be smoothly brought into contact with the cardan joint 17 so that the insertion hole 2 can be aligned with the cardan joint 17 by its own weight, it is extremely high regardless of the accuracy of the yoke. It enables accurate groove width measurement. The work at the time of measurement can be performed extremely easily and in a short time because the probe 2 is simply inserted into the narrow groove 1 by its own weight as described above. At this time, even if there is a step having the dimension a (FIG. 4), it does not affect the measurement.

In the present embodiment, the publicly known inspection head 4 and the like are adopted as the means for measuring the displacement amount of the tracing stylus 2, but of course the invention is not limited to this.

Further, the mechanism for holding the tracing stylus 2, the work supporting portion 16 and the like in multiple degrees of freedom is not limited to the rotating and swinging mechanism by the rotating shaft 7 and the supporting shaft 9, and the object to be measured is, as described above, a cardan. It is not limited to the joint 17.

In addition, since the dimensions of the narrow groove are known, the snap ring to be inserted therein can be easily selected, and the snap ring can be stably inserted.

[Effects of the Invention] As is clear from the above description, according to the present invention, it is possible to perform a highly accurate measurement of a narrow groove dimension, and at the same time, it is possible to perform the measurement in a short time and easily.

Further, even if both sides forming the gap are opposed to each other, the measurement can be performed, and since the measuring means is floatingly supported, the positioning can be easily performed.

[Brief description of drawings]

FIG. 1 is a side view of the whole structure showing an embodiment of the present invention,
FIG. 2 is a partial front view showing the details of the tracing stylus and the work supporting portion, FIG. 3 is a side view of FIG. 2, and FIG. 4 shows an engagement state of the tracing stylus and a non-measuring object cardan joint. Enlarged front view,
FIG. 5 is a front view showing the structure of the main part, and FIG. 6 is a side view of FIG. 1 ... Narrow groove, 2 ... Measuring element, 3 ... Lever mechanism, 4 ... Inspection head, 5 ... Floating mount, 6 ... Rotating head, 7 ... Rotating shaft, 8 ... Arm, 9 ... Support shaft, 10 ... Yoke, 11 ... Cup, 12, 13 ... Finished side surface, 14 ... Inclined surface, 15 ... Guide member, 16 ... Work support part, 17 ... Cardan joint, 18 ... Support base, 19 ... Tip part, 20 ... V groove, 21 … Column member, 22… Upper member, 23… Abutment fitting, 24… Reference surface 25… Head, 26… Column, 27… Base stand, 28… Balancing weight, 29… Pallet jig, 30… Table stand, 31… Holding Member, 32, 33 ... Guide bar, 34, 35 ... Actuator.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideaki Nishida, the first Toyota-cho, Toyota-shi, Aichi Prefecture Toyota Motor Co., Ltd. (72) Tetsuhiko Nomura, the first Toyota-machi, Toyota-shi, Aichi Toyota Motor Co., Ltd. ( 72) Inventor Toshio Matsumura 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Inventor Shogo Kagozaki 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Inventor Kamifukumoto et al. 2-13-1 Shimomaruko, Ota-ku, Tokyo Mitsui Seiki Kogyo Co., Ltd. Tokyo Factory (56) References JP 59-3301 (JP, A) JP 57-13801 (JP, B2) JP 39- 11886 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A measuring device for measuring a space dimension of narrow grooves between facing side surfaces formed facing each other in a member whose measurement reference surface is difficult to be taken, the measuring device being insertable into the narrow groove and capable of being inserted into one of the finishing side surfaces. A contact member having a measuring element with which the tip portion abuts, a measuring head that engages with the measuring element and detects the amount of displacement of the tip portion in the narrow groove width direction, and a reference surface that abuts the other of the finishing side surfaces. And holding the probe, the inspection head and the abutting member, positioning the tip of the probe on one of the finishing side faces, and contacting the other finishing side face opposite to the one finishing side face. An apparatus for measuring a narrow groove width, characterized in that a contact member is positioned and a floating mount that is supported in a straight line and in multiple degrees of freedom capable of rotational movement and swinging is provided on the stationary side of the apparatus.