JPH0254482B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention provides a measuring head which is designed for controlled guidance over the inner surface of a hollow cylinder, such as the inner wall of a bore, a pipe, etc., in particular of a cylinder bore of an internal combustion machine, over the inner surface to be measured. 2. An apparatus for measuring with a measuring head having a sensor movable in a direction intersecting the inner surface, the sensor being pressed against the inner surface, and the amount of movement of the sensor representing the shape of the inner surface to be measured. It is.

The object of the present invention is to provide a simple and extremely accurate measurement by using a scanning principle that allows accurate measurement of the deviation of the inner surface to be measured from the reference cylinder inner surface, that is, the ideal circular cylinder inner surface. The object of the present invention is to obtain the above-mentioned measuring method and apparatus.

The ideal circular cylinder inner surface can be obtained by scanning the cross-section of the cylinder on different planes or by scanning the cylindrical generatrix of the inner surface at different rotational angular positions, and using said ideal inner surface as a comparison standard. The measured value obtained by the sensor is compared with the stored reference value to calculate the deviation.

To achieve the above object, the present invention provides a hollow cylinder inner surface measuring device for measuring the inner surface of a substantially cylindrical hole, comprising: a housing inserted into the hole; and a workpiece having the cylindrical hole. a measuring arm rotatably coupled to the housing so as to be rotatable about the axis of the hole and extending in the axial direction of the hole; a first drive for rotating; a measuring head coupled to the measuring arm for axial movement along the length of the measuring arm; and a second drive for moving the measuring head axially relative to the measuring arm. a drive device, a sensor coupled radially movably relative to the measuring head, the sensor being pressed radially outwardly relative to the measuring head to a position where the sensor engages an inner surface of the hole; a spring device for biasing the sensor; and a spring displacement responsive device responsive to the displacement of the spring device to generate an electrical signal for radial movement of the sensor relative to the measuring head and to indicate the contour of the inner surface of the hole. The spring device is constituted by a leaf spring, and the leaf spring is provided with a thin piece strain gauge as a spring displacement response device, and when the sensor moves, the free end of the leaf spring actually mainly moves in the longitudinal direction of the sensor. moving the leaf spring to connect the free end of the leaf spring to the sensor so that the flake strain gauge generates an electrical signal corresponding and proportional to the amount of movement of the sensor, and connecting the clamp end of the leaf spring to the measuring head. It is characterized by being clamped to the housing.

According to this embodiment of the invention, the leaf spring acting as a measuring spring follows exactly the movement of the sensor, for example a sensor pin. The leaf springs do not cause any relative cross-direction movement, nor do they create any reaction forces on the sensor pins, so they do not affect the measurement results. An electrical output signal of the lamella strain gauge is thus obtained which corresponds precisely and is proportional to the radial displacement of the sensor pin. In this way, a highly accurate measurement value representing the shape of the measured inner surface is obtained as an output signal, and this measurement value is input to an output device or a computer for further processing.

In a preferred embodiment of the device according to the invention, the free end of the leaf spring is arranged to intersect the longitudinal axis of the sensor, and the thin-film strain gauge is located between the clamp end and the free end holding the sensor. The intermediate portion of the leaf spring comprising: is arranged to form an angle between 145° and 165° with respect to the free end of the leaf spring, preferably said angle being 160°. The leaf spring can be curved or straight between the free end that holds the sensor pin and the clamped end that holds the measuring head. In the case of a curved shape with a constant curvature, that is, a circular arc shape, the leaf spring performs a movement that does not affect the measurement results as described above, and the shape that forms the above-mentioned angle at a certain length of the leaf spring can be easily created. It can be calculated as follows. Straight springs are easier to manufacture.

When the measuring head is moved axially or rotated in order to scan discrete points on the inner surface to be measured, it must be ensured that the thin-film strain gauges placed on the leaf springs of the measuring head are energized. This becomes a problem if the power supply means, for example a cable, exerts forces on the measuring head that influence the measurement result. In order to prevent this from influencing the measurement results, in a preferred embodiment of the invention, a cable for supplying power to the measuring head is led out of the fixed housing and connected to the measuring head along the measuring arm. A cable guiding device is provided for retracting and retracting the cable during rotation and axial movement of the measuring head relative to the housing.

In this regard, the cable guiding device is preferably provided with a guide roller forming a cable loop that is wound around and released from the housing, the guide roller being movable in the direction of the circumferential edge of the housing, and Arranged on a slide spring-biased in the direction of pulling the cable, the cable guiding device is further provided with a guiding device having a guiding roller rotatable together with the measuring arm.

When measuring a long hole, for example, the inner wall of a pipe, the mounting device is provided with two sets of clamp jaws, these clamp jaws are spaced apart from each other in the axial direction, and the measuring device is clamped to the hole to be measured by these clamp jaws. Configure it so that it can
The housing is axially movable by a shift rod to another measurement position of the hole to be measured, and the two sets of clamp jaws are operable by a link mechanism that is adjustable and supported on the shift rod. do.

This allows the measuring device to be easily moved from one section to another within the hole. Preferably, the link mechanism is provided with a first shaft, the first shaft is rotatably supported within the hollow shift rod, and at least one of the two sets of clamp jaws is attached to the inner end of the first shaft. The first shaft is configured to carry a driving member for operating the first shaft, and to drive the first shaft by means of rotational driving means. Furthermore, a second shaft is provided in the link mechanism, the second shaft is passed through the hollow first shaft, and a rotational drive means for the second shaft is provided, and the second shaft is driven by the second shaft. One of the clamp jaws of the set is operated, and the other clamp jaw is operated by the first shaft.

The shift rod is movably supported in the inlet region of the hole by a bearing rigidly supported in the inlet region, and the shift rod is provided with an axial displacement measuring scale to be read at a mark provided on the bearing. With this configuration, the amount of movement of the shift rod and the entire measuring device can be finely adjusted.

At least one mark line is provided on the shift rod as a guide to prevent twisting of the shift rod during axial movement of the measuring device.

Preferably, the shift rod is rotatably connected to the housing of the measuring device by a universal joint, so as not to transmit any bending stresses to the housing and to the measuring device. The universal joint can be a rubber joint, a Cardan joint, a constant motion joint, or other known universal joints.

Next, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the measuring device is provided with a multi-piece housing 1 in which a measuring arm 2 is supported by precision ball bearings 3, 4. The measuring arm 2 is configured to be rotated by a stepping motor 5. Another stepping motor 7 accommodated in the housing
The measuring slide 6 along this measuring arm 2
to be freely movable in the axial direction. The measuring slide 6 carries a measuring head 8 which can be manually moved radially along the dovetail guide 8' and finely adjusted to correspond to the nominal diameter of the hole D to be measured. can. For this fine adjustment, longitudinal slots 80 are provided in the measuring head 8 and in the set screw 81 (see FIGS. 2 and 3). The measuring head is provided with a radially movable sensor or sensor pin 9 which is provided with a tip 10 made of ruby.
In order to accurately convert the displacement of the sensor pin 9 into an electrical output signal, the slotted free end 20 of the leaf spring 21
is held by a cross pin 17, and its free end intersects the longitudinal axis of the sensor pin 9. Starting from the position of the sensor pin, clamp the leaf spring 21 at the clamp end 2.
2, and at this clamping end the leaf spring is firmly clamped to the measuring head 8 by means of a screw 23 and a retainer 24. The angle formed by the free end 20 and the clamp end 22 is approximately 145° to 165°,
The angle is preferably 160°. At a certain length of the spring,
The radial movement of the sensor pin causes the free end 20 of the leaf spring to move in the radial direction without a movement component in the direction transverse to the sensor pin 9, so that the effect that the reaction acting in the transverse direction is not transmitted from the leaf spring to the sensor pin 9 is achieved. A curvature of To simplify manufacturing, the curvature is constant, so the leaf spring is arc-shaped. Manufacturing is simpler if the leaf spring between the leading end 20 and the clamping end 22 is straight.

In the embodiment of the leaf spring shown in FIG. 4 (the same reference numerals are used for parts having similar functions as in the embodiments described above), the end of the leaf spring is shown with a straight leaf spring 21 in solid lines. The sections 20, 22 are bent at an angle to the straight intermediate section 21', so that the clamp end 22 is at a 90 DEG angle to the free end 20.

Part 2 between the free end 20 and the straight intermediate part 21'
6 is approximately 160°, which corresponds to an opening angle of 20° in portion 26'. According to this embodiment, the free end 20 of the leaf spring 21 is biased into abutment against a hemispherical head 27 arranged at the inner end of the sensor pin 9. The supporting member on the opposite side is a hemispherical head 28 formed on a threaded bolt 29.

As an alternative to the leaf spring embodiment shown in FIG. 4, an arc-shaped leaf spring of radius R is shown in dotted lines. Although this shape facilitates calculations in order to obtain the above-mentioned required conditions, it is more complex to manufacture than the linear shape embodiment shown by the solid line.

In both leaf spring embodiments described above, thin-piece strain gauges 25 are bonded to both sides of the central portion of the leaf spring 21. These flake strain gauges are connected in a known manner to the bridge circuit and are arranged to provide an electrical output signal that is very precisely proportional to the amount of movement of the free end 20 in the direction of the longitudinal axis of the sensor pin 9. This is ensured by the above-described leaf spring configuration and leaf spring design with good linearity and low restoring force. According to actually manufactured leaf springs, for example, the linearity of the measurement range deviates from a straight line by 10 ^-3 %.
It is as follows.

In the embodiment of the measuring device, the resolution of the stepping motor 5 that rotates the measuring arm 2, that is, the width of the stepping step, is set to be exactly 0.417°, and the resolution of the stepping motor 7 that moves the measuring head 8 in the axial direction is set to be exactly 0.417°.
It shall be 13.889μm. This high degree of analysis enables precise positioning with high accuracy.

In the diagram of FIG. 5, reference numeral D indicates the inner contour of the bore of the cylinder to be fitted. Housing 1
A measuring device having a housing with a measuring arm 2 arranged so as to be rotatably driven is inserted into the bore of the cylinder. The measuring slide 6 is configured to be freely movable along the measuring arm 2 in the axial direction. A measuring head 8 is carried on a measuring slide 6, and this measuring head 8
A radially adjustable sensor pin 9 is provided at the sensor pin 9, and a measuring tip 10 is provided on this sensor pin. The housing 1 is clamped in the hole D by clamp jaws 12, which are evenly distributed around the periphery.

In FIG. 5 the measuring device is shown in operating condition.

The measuring tip 10 of the sensor pin 9 performs a discrete scanning of the internal contour D of the hole along the generatrix or circumferential line of the hole. Send the measurement results to the computer 30,
This computer is connected to the storage device 31. This storage device stores sensor pins 9 that are not subjected to load at a plurality of locations on a reference cylinder for comparison.
The value obtained by moving and storing is stored.

The measured value of the internal contour D obtained by the measuring device is determined by the computer 30 as follows.

Regardless of the actual position of the measuring tip 10, the computer 30 retrieves the reference value of the position closest to the measuring position from the storage device 31, writes this reference value for the intermediate position taken by the measuring tip 10, and writes it to the actual position. Subtract the written value from the measured value. In this way, the actual measurements are corrected so that rotational inaccuracies or other measurement errors of the illustrated measuring device are compensated for.

The computer 30 then sends an adjustment signal to the control device 32, which starts adjusting the measuring slide 6 in the axial direction and rotating the measuring arm 2 in the circumferential direction to move to a new measuring point on the internal contour D. . Arrows indicate the direction of signal flow.

The parts of the measuring device described with reference to FIGS. 1 to 5 are designated by the same reference numerals in FIGS. 6 to 8. In FIGS. 6 and 7, the cable guiding arrangement of the cable 50 feeding the thin-film strain gauge 25 of the measuring head 8 is shown. The cable 50 is led out from the measuring head in the axial direction parallel to the measuring arm 2 and reaches a member 51 which is rotatable together with the measuring arm and passes through a guide roller 52 supported on this member,
introduced into the housing 1 by another guide roller 53 supported on the housing 1 and then again by the measuring arm 2.
The guide roller 55 is supported in the housing 1 as a cable section 54 extending parallel to the axis of the cable. The cable is then turned circumferentially and passed around the guide roller 57 as a loop section 56 to achieve a 180° turn and to the fixing point 58 of the housing.
reach. The guide roller 57 is supported by a slide 59 that is movable in the circumferential direction. This slide 5
9 is biased by a helical spring 60 acting in the direction of pulling the loop 56, which is guided between the two parts of the cable forming the loop 56 over a part of the peripheral area of the housing, and then guided by a guide roller. (not shown) rotated 90° around
It again extends in the axial direction of the housing until it reaches the hinge point 62 of the housing.

The helical spring 60 moves the cable 50 through the slide 59, the guide roller 57 and the loop portion 56.
is held at a constant tension.

The cable is led out of a loop 56 which acts as a storage means during the axial movement of the measuring head 8 along the measuring arm 2. Pulling out the cable moves the slide 59 along the periphery of the housing. In order to prevent the cable from generating traction force, a ring 6 is rotatably supported on the housing.
3, 64, the cable portion extending circumferentially and forming a loop portion 56 is moved. When the measuring arm is rotated, the cable portion 65 extending in the circumferential direction between the guide rollers 52 and 53 that rotate together with the measuring arm 2 expands and contracts, so that the cable is pulled in or pulled out from the loop portion 56. (See Figure 8).

In the cable guiding device described above, the cable for supplying the lamellar strain gauge 25 of the measuring head 8 is connected axially to the measuring arm by the helical spring 6.
It engages the measuring head with a tensile force determined by 0, and no force is generated in the direction of movement of the sensor pin.
Of course, care must be taken that changes in the length of the cable 50 during rotation or axial movement of the measuring head 8 do not influence the measurement results.

9-11, reference numeral 101 indicates a tube having a hole wall 102 which is of inaccurate shape and is therefore to be measured. Housing 1 to measuring device 103
04, and the housing is configured to be clamped to the hole wall 102 by two clamp jaws 105 and 106. The measuring arm 107 projects axially from the housing and the measuring head 10
The measuring head 8 is made to be freely movable in the axial direction and rotatable, and furthermore, a ball-shaped sensor 109 is provided on the measuring head 8 in order to scan the hole wall. In FIG. 9, measuring head 108
The right extreme position of the measurement arm 107 is shown by a solid line, and the left extreme position is shown by a dotted line. Step drive means for axially moving and rotating the measuring head 108 are arranged within the housing 104.

A shift rod 110 is connected to the right end of the housing by a universal joint 111 so that the universal joint rotates together with the shift rod. This universal joint is shown as circle 111 in FIG.
In FIG. 0, a rubber joint having a rubber ring 112 is shown. Furthermore, the universal joint can be a known Cardan joint or a constant motion joint.

The free end of the shift rod 110, which projects from the tube 101, is guided in a bearing ring 113, which is provided with a guide hub 114 and clamped in the entry area of the bore of the tube 101. Mark 1 on guide hub 114
15, and the shift rod 110 carries a movement measurement scale 116.
Also, the amount of movement of the measuring device 103 can be accurately read at the position of the mark 115. bearing ring 1
13 further includes an opening portion 11 for a lead-in line 118.
7 is provided, by which the stepping drive means within the housing 104 can be energized and controlled.

The shift rod 110 is provided with at least one mark line 119, which marks the shift rod 110 during movement within the tube 101.
This provides a guideline for preventing 10 from twisting.

Shift rod 110 is hollow to accommodate a linkage mechanism and allow shaft 120 to rotate by a rotary cap 121, which is provided at the right end of shift rod 110 as shown in FIG.

As shown in FIG. 10, a rotary cap 121 is rotatably fixed to the end of the shaft 120 by a pin 122. At the inner end, ie at the left end as viewed in FIG. 10, a shaft 120 carries a pinion 123 for driving two clamping jaws (clamping jaws are known per se). The shaft 120 is the bearing 12
5, 126 for rotation within the shift rod 110.

By turning the rotary cap 121, the clamp jaws 105, 106 can be loosened somewhat from the hole wall 102. Next, the shift rod 110 is deeply advanced into the hole together with the entire measuring device 103,
This distance of entry is determined by the travel of the measuring head 108, the clamping jaws 105, 106 acting as guides. The distance required for this movement is mark 1
15 allows accurate reading on the movement measuring scale 116. When the movement is completed, the clamp jaws 105, 106 are again clamped to the hole wall 102 by turning the rotary cap 121. Next, a new part of the hole wall 102 is measured using the measuring head 1.
08.

In FIG. 10, a modified example having another shaft 128 passing through the hollow shaft 120 is shown by dotted lines. A further rotary cap 129 is carried at the free end of this further shaft 128 adjacent to rotary cap 121 . In this case, a shaft 120 and a pinion 123 of the shaft 120 act on one clamping jaw 106, and a shaft 128, which can be operated independently by means of a rotary cap 129, acts on the other clamping jaw 105 (not shown).

Shaft 12 instead of rotary caps 121, 129
It is of course possible to use a single rotary drive means for 0.128.

The above-mentioned measuring device can be easily and precisely adjusted by means of a shift rod to different measuring sections of the bore of a long tube or long cylinder. The length of the measuring section is related to the axial travel length of the measuring head 108.

The embodiment shown in FIG. 11 differs from the embodiments shown in FIGS. 9 and 10 in the following two points.

One advantage is that instead of the manually operated rotary cap 121, a stepping motor 130 attached to the free end of the shift rod 110 is used to drive the shaft 120 and operate the clamp jaw.

Furthermore, a stepping motor 131 is attached to the bearing ring 113 and acts via a drive pinion 132 on the teeth 133 provided on the shift rod 110 to automatically move the measuring device 103 instead of manually moving it.

Another embodiment of the measuring device is shown in detail in FIGS. 12 and 13, identical functional parts using the same reference numerals. Compared to the measuring device shown in FIG. 1, the difference is that the clamping jaw 12 is not used and the mounting is carried out outside the internal contour of the hole D. The advantage of this embodiment is that the measurement is not disturbed by clamping the measuring device in the hole, and that deformations of the hole can be prevented by clamping.

Two other embodiments are shown in Fig. 12, which differ from the embodiment shown in Fig. 1 only in that a holding means is provided outside the hole D.
13, these measuring devices are provided with a multi-piece housing 1 in which a measuring arm 2 is supported by precision ball bearings 3, 4. The measuring arm 2 is made rotatable by a motor 5 (preferably a stepping motor). The measuring slide 6 is movable axially along the measuring arm 2 by a drive means 7 which is housed in the housing and is preferably a stepping motor. A measuring head 8 is carried on a measuring slide 6, and this measuring head 8
can be manually finely adjusted in the radial direction to correspond to the inner diameter D of the cylinder sleeve 11. The measuring head 8 incorporates a radially adjustable sensor pin 9 with a tip 10 made of ruby. Any movement of this sensor pin 9 converts into an electrical output signal indicating the deviation of the cylinder diameter from a predetermined diameter.

In FIG. 12, the solid line shows the measuring head 8 in its upper extreme position and the dotted line the measuring slide 6 in its lower extreme position, scanning the internal contour D of the cylinder sleeve 11. Since the drive means 5, 7 are independent of each other, instead of scanning along the generatrix,
Of course, the scanning can be performed discretely or continuously in a circular manner or in a spiral curve.

The housing of the measuring device is held by a ring 12' into which the pin 13 is screwed.
These pins 13 are housed in a crankshaft bearing 14 of an engine block containing the cylinders of an internal combustion engine.

The pin 13 is screwed into the ring 12', for example, by means of a threaded bolt 16. To accommodate crankshaft bearings of different bearing diameters, pins of different diameters can be exchanged.

The embodiment shown in FIG. 13 is different from the embodiment shown in FIG.
ring 1 at the cylinder head end 21'' of
The difference is that it is supported by a ring 20' having a larger diameter than 2'. Near the outer periphery of the ring 20',
A retainer bolt 23' protrudes from the engine block 15 to secure the cylinder head (not shown).
Holes 22' are arranged in a circular manner to correspond to the arrangement of the holes 22'. To mount the measuring device, first the spacer sleeve 24' is pushed onto the dowel bolt 23'. Next, as in the case of the embodiment shown in FIG.
The ring 20' fixed to the retainer bolt 23' is slid onto the retainer bolt 23', and a nut 25' is screwed into the free end of the retainer bolt to clamp it. The spacer sleeve 24' makes it possible to utilize the entire travel of the measuring slide when measuring the deformation of the cylinder 11.

In all the embodiments described above, the mounting members, for example the holding means 13, 14 in the embodiment shown in FIG. Configure it so that it can match. This adjustment is important for the above-mentioned correction, ie subtraction of the stored difference value from the actually measured value. This adjustment can be made with a set screw (not shown).
According to the embodiment of FIG. 12, the pin 13 is connected to the ring 1
Adjustment can be made by screwing slightly deeper into the corresponding threaded hole 2'.

The measuring device does not necessarily have to be supported on the crankshaft bearing or on the end of the cylinder head, but can also be mounted at different locations on the engine block. However, it is important to provide support on the structural member to be measured or on other structural members connected to this structural member.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the first embodiment of the measuring device of the present invention, Fig. 2 is a sectional view taken along the line - in Fig. 1, and Fig. 3 is a partial sectional view taken in the direction of the arrow in Fig. 2. FIG. 4 is an enlarged partial sectional view similar to FIG. 2 showing another embodiment of the leaf spring, FIG. 5 is a diagram of a measuring system having the measuring device of the present invention, and FIG.
and 7 are side views at an angle of 90° to each other showing the cable guiding arrangement of the measuring device according to the invention, and FIG. 8 is a diagrammatic view of the end of the stationary housing adjacent to the measuring head of the device of FIGS. 6 and 7. 9 is a partial sectional view showing the measuring device of the present invention inserted into a tube, FIG. 10 is an enlarged sectional view of a part of the measuring device shown in FIG. 9, and FIG. FIG. 12 is a longitudinal sectional view of the measuring device of the present invention, which includes a mounting means provided at the end of the crankshaft of an internal combustion engine, and FIG. 13 shows a modified example of the mounting means. FIG. 1,104...Housing, 2,107...Measuring arm, 3,4...Precision ball bearing, 5,7,13
0,131...Step motor, 6...Measuring slide, 8,108...Measuring head, 8'...Dovetail guide, 9...Sensor or sensor pin, 10...Ruby tip, 11,11' ...Cylinder sleeve, 12,105,106...Clamp jaw,
12', 20'...Ring, 13...Pin, 14...
... Crankshaft bearing, 15 ... Engine block, 16 ... Threaded bolt, 17 ... Cross pin, 20 ... Free end of leaf spring, 21 ... Leaf spring, 2
2... Clamp end of leaf spring, 23... Screw, 2
3'...Retainer bolt, 24...Retainer, 24'...
... Spacer sleeve, 25 ... Thin-piece strain gauge,
27, 28... Hemispherical head, 30... Computer, 31... Storage device, 32... Control device, 5
0... Cable, 52, 53, 55, 57... Guide roller, 56... Cable loop portion, 59
...Slide, 60...Spiral spring, 101...
Pipe, 102... Hole wall, 103... Measuring device, 11
0...Shift rod, 111...Universal joint, 11
2...Rubber ring, 113...Bearing ring, 11
4...Guidance hub, 115...Mark, 116...
Movement measurement scale, 119... mark line,
120, 128... shaft, 121, 129... rotary cap, 123... pinion.

Claims (1)

[Claims] 1. A hollow cylinder inner surface measuring device for measuring the inner surface of a substantially cylindrical hole, comprising: a hanging 1 inserted into the hole; and a mounting device for attaching this housing to a workpiece having the cylindrical hole. 12,12',2
0'; a measuring arm 2 rotatably connected to the housing so as to be rotatable about the axis of the hole and extending in the axial direction of the hole; a first drive 5 for moving the measuring arm; and a measuring head 8 coupled to the measuring arm so as to be movable in the axial direction along the length of the measuring arm.
a second drive device 7 for moving the measuring head in the axial direction with respect to the measuring arm; a sensor 9 coupled to the measuring head so as to be movable in the radial direction; a spring device 21 for pushing the sensor radially outwardly into a position in which it engages the inner surface of the hole;
and a spring displacement responsive device responsive to displacement of the spring device to generate an electrical signal for radial movement of the sensor relative to the measurement head and to display a contour of the inner surface of the hole, the spring device comprising: The leaf spring is provided with a thin piece strain gauge as a spring displacement response device, and when the sensor moves, the free end of the leaf spring actually moves mainly in the longitudinal direction of the sensor, and the thin piece The free end of the leaf spring is connected to the sensor so that a strain gauge generates an electrical signal corresponding and proportional to the displacement of the sensor, and the clamp end of the leaf spring is clamped to the housing of the measuring head. Features: Hollow cylinder inner surface measuring device. 2. An intermediate portion of the leaf spring, the free end of the leaf spring being arranged to intersect the longitudinal axis of the sensor, and comprising the flake strain gauge between the clamp end and the free end holding the sensor. 2. A device for measuring the inner surface of a hollow cylinder according to claim 1, wherein the hollow cylinder is configured to form an angle between 145° and 165° with respect to the free end of the leaf spring. 3. The hollow cylinder inner surface measuring device according to claim 2, wherein the angle is 160 degrees. 4. The hollow cylinder inner surface measuring device according to claim 1 or 2, characterized in that the leaf spring is curved in an arc shape between the clamp end and the free end. 5. The hollow cylinder inner surface measuring device according to claim 1 or 2, characterized in that an intermediate portion of the leaf spring between the clamp end and the free end extends substantially linearly. . 6. The thin-piece strain gauges are bonded to both sides of the leaf spring, and the combined output signals of the gauges on both sides indicate deviation from a predetermined cylinder diameter. The hollow cylinder inner surface measuring device according to item 2. 7. The spring displacement-responsive device is configured to allow a cable for powering the measuring head to be led out of the fixed housing and extend along the measuring arm to the measuring head, and to control the rotational and axial movement of the measuring head relative to the housing. 2. A hollow cylinder inner surface measuring device according to claim 1, characterized in that the hollow cylinder inner surface measuring device is constructed as having a cable guide device for storing and pulling out the cable during the process. 8. The cable guide device is configured to include a guide roller that forms a cable loop that is wound around and released from the housing, and the guide roller is movable in a peripheral direction of the housing and that Claim 7, characterized in that the cable guiding device is arranged on a slide biased by a spring in the direction of tension, and the cable guiding device further comprises a guiding roller rotatable together with the measuring arm. The hollow cylinder inner surface measurement device described. 9. The mounting device is configured to have two sets of clamp jaws, these clamp jaws are spaced apart from each other in the axial direction, and configured such that the measuring device can be clamped in the hole to be measured by these clamp jaws, and the housing is It is configured to be movable in the axial direction by a shift rod by a limited distance to other measurement positions of the hole to be measured, and to be operable by a link mechanism in which the two sets of clamp jaws are adjustable and supported on the shift rod. A device for measuring the inner surface of a hollow citadel according to claim 1. 10 The link mechanism has a first shaft, the first shaft is rotatably supported within the hollow shift rod, and the second shaft is attached to the inner end of the first shaft.
The inner surface of the hollow cylinder according to claim 9, wherein the inner surface of the hollow cylinder is configured to carry a driving member for operating at least one of the clamp jaws of the set, and to drive the first shaft by a rotational driving device. measuring device. 11 The link mechanism has a second shaft and a second shaft.
The second shaft is passed through the hollow first shaft of the shaft.
and a rotary drive device for the shafts, the second shaft operates one of the two sets of clamp jaws, and the first shaft operates the other clamp jaw. A hollow cylinder inner surface measuring device according to claim 9 or 10. 12. Hollow cylinder inner surface measurement according to claim 10 or 11, characterized in that one or both of the rotary drive devices is a manually operated rotary cap disposed at the free end of a shaft protruding from the shift rod. Device. 13. The hollow cylinder inner surface measuring device according to claim 9, wherein the shift rod is movably supported in the entrance region of the hole by a bearing firmly supported in the entrance region. 14. The hollow cylinder inner surface measuring device according to claim 13, wherein the shift rod is configured to have an axial movement measurement scale to be read on a mark provided on the bearing. 15. The hollow cylinder inner surface measuring device according to claim 9, wherein the shift rod is configured to have at least one mark line. 16. The hollow cylinder inner surface measuring device according to claim 9, wherein the shift rod is rotatably connected to the housing of the measuring device by a universal joint. 17. The hollow cylinder inner surface measuring device according to claim 9, wherein the shift rod and the link mechanism are separated. 18. The hollow cylinder inner surface measuring device according to claim 9, wherein the shift rod is made movable in the axial direction by a stepped motor.