JPH02285201A - Crankshaft dimension measuring instrument - Google Patents

Abstract

PURPOSE:To reduce a measuring cycle time and enable a measuring instrument to comply with the measurement of a plurality of types of crankshafts by changing the forward position of a sleeve which is a reference member in accordance with the type of the crankshaft. CONSTITUTION:A sleeve 6 abuts against the end face of a journal portion J1 to position a crankshaft Cs in its axial direction. A head center 8 engages a center hole in the end face of the crankshaft Cs to position in a radial direction. A tail center 14 engages a center hole in the other end face of the crankshaft Cs to position also in the radial direction and presses the end face of the journal portion J1 against the sleeve 6. A pair of probes 21 and 22 integrally move forward and backward fore and aft in a direction vertical to the axis of the crankshaft Cs to be brought into contact with a pair of journal portions J2 and J4, respectively. The probes 21 and 22 have the maximum and minimum allowable sizes for the width dimensions of the journal portions J2 and J4 and detect whether the probes 21 and 22 are adapted to the journal portions J2 and J4 by proximity switches 32 and 33, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a measuring device for measuring the width dimension of a journal portion of a machined crankshaft for an internal combustion engine.

2. Description of the Related Art As an example of an apparatus for measuring the width dimension of a journal portion of a crankshaft which has been subjected to turning in a crankshaft machining line, there is a device having a structure shown in FIG. 6, for example. This device has a second journal located at the same distance on the left and right from the center of the third journal portion J3 of the crankshaft Cs. Fourth
Journal part J2. This is a device for simultaneously measuring the width dimension of J4. The fourth journal portions J2 and 14 are turned by a common turning tool in a turning process.

In Figure 6, 51.52 is the air cylinder 58.59
moves forward and backward by the action of the crankshaft C.
The center 53 and 54 engage with the center holes at both ends of the crankshaft Cs to support the crankshaft Cs, and 53 and 54 are the second centers. Fourth journal portion J2. A differential transformer type measuring head provided corresponding to J4, 55 is a positioning block that controls the axial positioning of the measuring head 53.54 and the crankshaft C8, and the measuring head 53.54 functions as the air cylinder 56. In addition, the positioning block 55 is moved to the crankshaft Cs by the action of the other air cylinder 57.
It moves forward and backward from the direction perpendicular to the axis of the axis.

In this structure, when the crankshaft Cs is transported on the same axis as the recenter 51.52 by a transport device (not shown), the positioning block 55 is lowered by the action of the air cylinder 57, and the positioning block 55 is By pushing into the width of the journal portion J3, the measuring head 53, 54 and the crankshaft Cs are positioned in the longitudinal direction. Furthermore, the crankshaft Cs is positioned in the radial direction by moving both centers 51 and 52 forward and engaging the center holes at both ends of the crankshaft C3. Then, the measuring head 53.54 is lowered by the action of the air cylinder 56, and this measuring head 53.54 is moved to the second position. Fourth journal portion J2. Each journal part J2. by pushing it into the width of J4. The width dimension of J4 is measured. Then, the second and fourth
Journal part J2. It is determined whether the width dimension of J4 is appropriate.

Problems to be Solved by the Invention In such conventional measuring devices, the axial positioning and radial positioning of the crankshaft C8 are performed using mutually independent air cylinders 57, 58, and 59. Unless the positioning block 55 is properly fitted into the third journal portion J3, the centers 51, 52 cannot be moved forward, which increases the cycle time for measurement.

Furthermore, if an attempt is made to measure the dimension of a crankshaft with a different width dimension of the third journal portion J3, it cannot be done unless the reference block 55 is replaced or another measuring station is provided. In so-called mixed flow machining lines where the crankshafts flow in the same line, flexibility is not sufficient.

The present invention was made in view of the above problems.
The purpose is to provide a measuring device that can shorten the measurement cycle time and is capable of measuring a plurality of types of crankshafts.

Means for Solving the Problems The present invention provides an apparatus for measuring the width dimension of a pair of journal parts by supporting both ends of a crankshaft at the center, in which a large-diameter shaft part having a diameter larger than that of the end surface is formed at one end part. , the crankshaft is moved forward to a position where the crankshaft is to be positioned according to the length of the crankshaft, and is slid against a reference member that comes into contact with the end face of the large diameter shaft portion and controls the axial positioning of the crankshaft, and a reference member. a head center which is inserted and supported so as to move forward and backward together with the reference member by being biased by an elastic body, and which engages with a center hole in one end surface of the crankshaft to control radial positioning; a tail center that engages with a center hole on the other end surface of the shaft to control radial positioning and presses the end of the large diameter shaft portion against a reference member; a pair of probes that integrally move forward and backward to come into contact with the pair of journal parts, one having the maximum permissible width dimension of the journal part and the other having the minimum permissible width dimension of the journal part; and a detector that detects whether or not the gauge head is fitted into the journal portion based on the amount of displacement of the gauge head.

As the driving means for moving the reference member forward and backward, for example, a digital multi-stage cylinder or the like is used.

Function According to this structure, by changing the forward movement limit position of the reference member depending on the type of crankshaft and then moving the tail center forward, all crankshafts can move in the axial direction with the end face of the large diameter shaft part as a reference. is positioned, and the axial positions of the pair of journal parts to be measured coincide with the position of the probe. At the same time, the elastically biased head center moves forward together with the reference member, so that the crankshaft is positioned in the same radial direction by the head center and tail center.

By advancing the pair of probes in this state, each probe comes into contact with its corresponding journal portion.

It is assumed that the pair of journal parts are machined by a common turning tool, and furthermore, one gauge head has the minimum allowable dimensions and shape, and the other gauge head has the maximum allowable dimensions and shape. , if the detector detects that one contact point fits the width of the other journal section, and the other contact point does not fit the width of the other journal section, the width of both journal sections The dimensions can be considered to be within the permissible range.

Embodiment FIGS. 1 to 4 are configuration explanatory diagrams showing one embodiment of the present invention. Among the first to fifth journal parts J1 to J5 of the crankshaft Cs shown in FIG. 4 journal part J2. This shows a device that measures the width dimension of J4, m2°m4 (m2=m4). S is a gear shirt small portion formed continuously at the end of the first journal portion J1 serving as the large diameter shaft portion.

The crankshaft C8 shown in FIG. 5 is of type A, and compared to the crankshaft C of type A, only the length e of the gear shaft portion S is shorter (width dimension f of the third journal portion J3). is the same as that of type A) is classified as type B, and furthermore, the distances g and h from the center of the third journal part J3 are larger by a predetermined amount (the distances g and h from the center of the third journal part J3 are larger than the crankshaft Cs of type A) ( The width dimension f is larger than that of type A), and the length e of the gear shaft part S
If the type C crankshaft is one that is larger by a predetermined amount, then the second. Fourth journal portion J2. Since the pitch of J4 is the same, the above-mentioned measuring device can measure the pitch of the 2nd. Fourth journal portion J2. The width dimension of J4 can be measured.

1 to 4, l is a headstock attached to the base 2, 3 is a tailstock also attached to the base 2 so as to face the headstock 1, and 4 is a headstock attached to the base 2.
is a measurement unit installed above the axis connecting the headstock 1 and the tailstock 3.

A cylindrical sleeve 6 with a part of the lower half cut out is integrally connected to the tip of the shaft 5 of the headstock 1 as a reference member, and a coil spring 7 inside the sleeve 6 is biased forward. The head center 8 is slidably inserted. The shaft 5 is connected via a connecting plate 11 to a piston rod 10 of a multi-stage cylinder 9 provided parallel to the shaft 5, and the action of the multi-stage cylinder 9 causes a sleeve 6 integral with the shaft 5 to move forward and backward.

The multi-stage cylinder 9 has two air cylinders 12.13 with different strokes arranged on the same axis, and there are two cases: when both air cylinders 12.13 are extended, and when only one air cylinder 12 is extended. The stroke can be changed digitally. In other words, the advanced limit position of the sleeve 6 can be selectively switched between when both air cylinders 12 and 13 are extended and when only one air cylinder 12 is extended.

On the other hand, the tail stock 3 is provided with a shaft 15 having a tail center 14 attached to its tip, and this shaft 15 is connected to a piston rod 18 of an air cylinder 17 parallel to the shaft 15 via a connecting plate 16. There is. Therefore, the tail center 14 moves forward and backward by the action of the air cylinder 17, and supports both ends of the crankshaft Cs in cooperation with the head center 8, as shown in FIG.

The measuring unit 4 has a slide base 20 supported on a substantially vertical base plate 19 so as to be movable up and down. Fourth journal portion J2. A pair of probes 2 corresponding to J4
1.22, the slide base 20 is guided by the rail 24 and the linear guide 25 by the action of the air cylinder 23 and moves up and down. 26.27 is the stock that regulates the upper and lower limit positions of the slide base? It's a paddle.

A pair of probes 21 and 22 are integrally fixed to the tips of guide rods 28 and 29.
is vertically movably supported by a holder 30 integrated with the slide base 20, while a fill spring 31 applies a downward biasing force. The tip of each measuring element 21, 22 is formed into a rectangular cross section, and the width dimension of one measuring element 22 is the second. Fourth journal portion J2. Width of J4 m2
+m4 is set to the minimum allowable dimension, and the other contact point 21
The width dimension of is the second. Fourth journal portion J2. J4 width m
2. The maximum allowable dimension is m4. Proximity switches 32, 33 as detectors are provided on the slide base 20 corresponding to each guide rod 28, 29, and as will be described later, a second proximity switch 32, 33 is provided corresponding to each guide rod 28, 29. Fourth journal part J
2. Based on the amount of displacement of the guide rod 28.29 when the contact point 21.22 is pressed against J4, the contact point 21.22 moves to the journal portion J2. Proximity switches 32 and 33 detect whether or not it has been fitted within the width of J4.

34 is a proximal body that is integrally fixed to the guide rod 29.

Also, one of the proximity switches 32 is turned off in the state shown in FIG.
, the other proximity switch 33 is set to be ON in the state shown in FIG.

Next, the operation of the measuring device configured as described above will be explained.

As shown in FIG. 1, the crankshaft Cs, which has been subjected to turning processing in the previous process, is transferred to a lift-and-carry one-type conveyor device 35.
(Then, the lifter 36 rises to raise the crankshaft Cs to a position on the same axis as both centers 8 and 14.

Then, when the crankshaft Cs rises to a predetermined height position, the multi-stage cylinder 9 is activated and the sleeve 6 moves forward together with the head center 8, and the sleeve 6 moves to the first journal portion Jl, which is the large diameter shaft portion of the crankshaft cs. First, axial positioning is performed by abutting against the end surface of. At the same time, the head center 8 engages with the center hole 37 in the end face of the crankshaft Cs, thereby performing radial positioning.

At this time, the three types of crankshafts Cs, A, B, and C mentioned above, are sent at random from the previous process, so the multistage cylinder 9 operates based on the type information given in advance to generate each crankshaft C$. The sleeve 6 is advanced to a position according to the type. In other words, since the dimensions g and h in Fig. 5 are different between the two types A and B crankshafts O8 and the C type crankshaft Cs, as described above,
It is necessary to change the forward limit position of the sleeve 6, which serves as a reference for axial positioning of the crankshaft Cs.

Therefore, in the case of two types of crankshafts Cs, A and B, only the air cylinder 12 is extended, while Cg!
In the case of a similar crankshaft Cs, both air cylinders 12, 13 are extended. As a result, regardless of the difference in g and h dimensions mentioned above, the second
．． Fourth journal portion J2. Adjust the position of J4 using the measuring tip 21.
22 positions.

In addition, the crankshaft C8 of the three types A, B, and C is the fifth
Although the 0 dimensions of the gear shaft part S in the figure are different,
This difference in the length e of the gear shaft portion S is absorbed by the displacement of the head center 8.

When the sleeve 6 advances to a predetermined position as described above, the air cylinder 17 on the tail stock 3 side is activated to move the tail center 14 forward, and the tail center 14 is attached to the end surface of the flange portion F side of the crankshaft Cs. It engages with the center hole 38. As a result, the crankshaft Cs is positioned in the axial direction by the sleeve 6, and its both ends are supported by the center 8.14, thereby positioning it in the radial direction.

When the crankshaft Cs is thus positioned in the axial and radial directions, the air cylinder 23 of the measurement unit 4 is operated and the slide base 20 is lowered relative to the crankshaft Cs.

When the slide base 20 is lowered, one measuring element 22 is pressed against the second journal part J2, and the other measuring element 21 is pressed against the fourth journal part J4. The tip of one probe 22 is connected to the second and fourth journal portions J2.
．． Width dimension of J4 m2. Since it is formed to have the same dimension as the minimum allowable dimension of m4, if the tip of the probe 22 fits correctly within the width of the second journal part J2, the guide rod 29 will not be displaced at all, and conversely, the measurement If the child 22 does not fit within the width of the second journal portion J2, the guide rod 29
will move up relatively. As a result, the proximity body 34 integrated with the guide rod 29 separates from the proximity switch 33, and the proximity switch 33 is turned off.

On the other hand, the tip of the other probe 21 is connected to the second tip. Fourth journal portion J2. Since the width dimension of J4 is the same as the maximum allowable dimension of m 2 + m 4, if the tip of the probe 21 fits within the width of the fourth journal part J4, the guide rod 28 is not displaced at all, and on the contrary, if the probe 21 does not enter within the width of the fourth journal portion J4, the guide rod 28 moves relatively upward. As a result, the tip of the guide rod 28 comes close to the proximity switch 32, and the proximity switch 32 is turned on.

In other words, one probe 22 is connected to the second probe 22. Fourth journal portion J2. Width dimension of J4 m2. having a minimum permissible dimension of m4,
The other probe 21 is the second probe. Fourth journal part J2
．． Width dimension of J4 m2. Since it has a maximum allowable dimension of m4, one measuring element 21 fits within the width of the second journal part J2, and the other measuring element 21 fits within the width of the fourth journal part J4. If the proximity switch 32.33 detects that the second. Fourth journal portion J2. The actual width dimension m2+m4 of J4 is determined to be within the allowable dimension.

Effects of the Invention As described above, according to the present invention, one center moves in conjunction with the movement of the reference member. can be performed substantially simultaneously.

As a result, the time required for positioning and, in turn, the measurement cycle time can be shortened compared to the conventional method of radial positioning using a center after waiting for the reference member to fit correctly with a specific journal part. I can do it.

In addition, the reference member moves forward to a position corresponding to the length of each crankshaft based on the crankshaft type signal, so it is possible to measure crankshafts of different lengths without changing setups, and to measure multiple types of crankshafts. It can also be flexibly applied to so-called mixed flow machining lines where shafts flow in the same line. In addition, during measurement, the probe is essentially used as a feeler gauge to only detect whether the width of the journal part is within a predetermined tolerance, so each journal part is This has the advantage that the measurement system can be simplified and the device manufacturing cost can be suppressed compared to the case where the width dimension of each is measured individually.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the present invention, and is an explanatory diagram of the configuration seen from the front, Fig. 2 is a side view of the measurement unit, Fig. 3 is a plan view of the headstock, and Fig. 4 is a plan view of the tailstock. FIG. 5 is an explanatory diagram of a crankshaft, and FIG. 6 is an explanatory diagram of a configuration showing an example of a conventional measuring device. l...Head stock, 3...Tail stock, 4
... Measuring unit, 6... Sleeve as reference member, 7... Coil spring, 8... Head center, 9... Multistage cylinder, 14... Tail center, 1
7... Air cylinder, 20... Slide base, 2
1.22...Measuring head, 23...Air cylinder, 32
．． 33...Proximity switch as a detector, 37.38
...Center hole, Cs...Crankshaft, Jl.
・First journal part as a large diameter shaft part, J2...
2nd journal part, J4... 4th journal part. Figure 2 Figure 3] 8

Claims (1)

[Claims] (1) In a device that measures the width of a pair of journal parts by centrally supporting both ends of a crankshaft in which a large-diameter shaft part with a larger diameter than the end face is formed at one end, the length of the crankshaft is measured. a reference member that moves the crankshaft forward to a position where the crankshaft is to be positioned and abuts against the end face of the large diameter shaft portion to control the axial positioning of the crankshaft; and a reference member that is slidably inserted and supported by the reference member. A head center that moves forward and backward together with the reference member by being biased by an elastic body and engages with a center hole on one end surface of the crankshaft to control radial positioning; and a center hole on the other end surface of the crankshaft. A tail center that engages to control radial positioning and presses the end face of the large diameter shaft portion against a reference member; contact the journal part of
a pair of measuring elements, one of which has a maximum permissible width dimension of the journal part and the other of which has a minimum permissible width dimension of the journal part, and the measuring element fits into the journal part based on the amount of displacement of the measuring element. A crankshaft dimension measuring device comprising: a detector for detecting whether or not the crankshaft dimensions are aligned.