JP5686293B2 - Inner surface measuring device - Google Patents

Description

  The present invention relates to an inner peripheral surface measuring apparatus for an object.

  Japanese Patent Laying-Open No. 2005-037148 describes an inner circumferential surface measuring device that measures the roundness and the like of inner circumferential surfaces of a plurality of bearings that pivotally support a crankshaft of an internal combustion engine. In this measuring apparatus, a male screw rod extending in the direction of the rotation axis of the spindle is provided in the spindle, and a displacement sensor for measuring the inner peripheral surface is attached to the female screw block screwed to the male screw rod. When measuring the inner peripheral surface, the cylinder block, which is the object to be measured, is placed at a predetermined position of the measuring device, the spindle is inserted into the bearing of the cylinder block, and the male screw rod is driven to rotate by a servo motor connected to the male screw rod. Then, the displacement sensor is moved to the position of the bearing to be measured of the cylinder block, and the spindle is rotated by the servo motor via the electromagnetic clutch.

JP 2005-037148 A

  However, in the above inner peripheral surface measuring device, the drive mechanism for moving and rotating the displacement sensor to the position of the bearing to be measured of the cylinder block is provided in the spindle, so that the outer diameter of the spindle becomes relatively large. . Therefore, for a small engine having a relatively small diameter shaft shaft bearing, it is difficult to insert the spindle into the bearing to be measured, and the inner peripheral surface measurement using the inner peripheral surface measuring device may not be applicable. . In addition, since it is necessary to place the measurement object on the measurement apparatus, it may be difficult to cope with the measurement in the manufacturing process. In addition, components and control software for moving and rotating the displacement sensor are required, which may increase the manufacturing cost of the inner peripheral surface measuring device.

  Therefore, in the present invention, it is possible to measure an inner peripheral surface of a bearing to be measured having a small inner peripheral surface, and it is possible to easily use it in a manufacturing process, and to provide an inner peripheral surface measuring device with low manufacturing cost. With the goal.

  In order to achieve the above object, the inner peripheral surface measuring device of the present invention is an inner peripheral surface of the through hole of the measurement object having a through hole having a circular cross section that linearly penetrates the first end surface and the second end surface. An inner peripheral surface measuring device for measuring the shape of the first support member, a second support member, a measurement spindle, a guide member, a movement restricting means, a string-like member, a distance measuring means, And a rotation angle detecting means. The first support member is detachably attached to the first end surface. The second support member is detachably attached to the second end surface. The measurement spindle is fixedly provided at both ends of the cylindrical portion through which the through hole is inserted, and is rotatably attached to the first and second support members around a rotation axis substantially parallel to the through hole. The cylindrical portion has an inner surface extending substantially parallel to the rotation axis, and a slit extending substantially parallel to the rotation axis by cutting out a part of the inner surface. And the first end portion has a communication hole that communicates the outside and the inside of the cylindrical portion, and at least one of the first and second end portions is exposed to the outside. The guide member is disposed inside the cylindrical portion of the measurement spindle, and has an engaging protrusion that engages with the slit so as to be slidable along the rotation axis. The rotation around the rotation axis is restricted. The movement restricting means restricts the slide movement along the rotation axis of the guide member so as to be released. It penetrates the guide member with an operated part on one end exposed in the slit of the measurement spindle and an action part on the other end that can protrude from the guide member, and the action part protrudes from the guide member to When the operated part is operated, the operating part moves between the unlocked position and the locked position, which are separated from the inner surface of the cylindrical part. The movement of the guide member along the rotation axis is restricted. The string-like member is provided with a distance scale along the length direction, and extends substantially in parallel with the rotation shaft from one end fixed to the guide member at a position facing the communication hole of the first end, and is inserted through the communication hole. To do. The distance measuring means is fixed to the guide member, has a measurement direction substantially orthogonal to the rotation axis and directed to the inner peripheral surface of the through hole through the slit of the measurement spindle, and the measurement spindle rotates about the rotation axis Thus, the distance to the inner peripheral surface is measured along the circumferential direction of the inner peripheral surface. The rotation angle detection means is fixed to either the first or second support member and detects the rotation angle of the measurement spindle.

  In the above configuration, when measuring the shape of the inner peripheral surface of the through hole of the measurement object, the operator first inserts the measurement spindle into the through hole of the measurement object, and the first and second support members. Is adjusted in advance so that the predetermined measurement position on the inner peripheral surface of the measurement object coincides with the measurement position of the distance measuring means in the measurement spindle. That is, before inserting the measuring spindle into the through hole of the measurement object, the movement restricting means releases the sliding movement along the rotation axis direction of the guide member to which the distance measuring means is fixed, and the guide member is measured according to a predetermined measurement. The guide member is moved manually to the position, and the movement of the guide member is restricted by the movement restricting means. This completes the adjustment of the measurement position of the distance measuring means. Next, a 1st support part is attached to the 1st end surface of a measuring object. Subsequently, from the second end face side of the measurement object, the measurement spindle with the measurement position of the distance measuring means adjusted is inserted into the through hole of the measurement object, and the cylindrical part of the measurement spindle is inserted into the through hole of the measurement object. At the same time, the first end of the measurement spindle is supported by the first support member. Subsequently, the second support member is attached to the second end surface of the measurement object, and the second end portion of the measurement spindle is supported by the second support member. In this supported state, the measurement spindle can rotate about a rotation axis substantially parallel to the through hole of the measurement object. Next, the first end or the second end of the measurement spindle protruding from the first support member or the second support member is operated, and the measurement spindle is manually rotated about the rotation axis. The distance measurement information output by the distance measuring means along with the rotation of the measurement spindle is acquired as inner peripheral surface measurement data in association with the rotation angle of the measurement spindle detected by the rotation angle measuring means, and the roundness and the like are measured. The shape of the inner peripheral surface of the object is obtained.

  When measuring the inner peripheral surface at another position of the measurement object, the second support part is removed from the second end surface of the measurement object, and the measurement spindle is once pulled out from the through hole of the measurement object. Next, the movement of the guide member is released by the movement restricting means, and the guide member is manually slid so that the measurement position of the distance measuring means matches the other measurement position of the through hole of the measurement object. . After confirming the measurement position of the distance measuring means by the distance scale of the string-like member, the movement restricting means restricts the movement of the guide member. Subsequently, the measurement spindle is inserted into the through hole from the second end face side of the measurement object, the second support portion is attached to the second end face, and the second end portion of the measurement spindle is supported by the second support portion. To do. Subsequently, the measurement spindle is rotated around the rotation axis, and the inner peripheral surface is measured at other positions.

  When the measurement spindle is inserted into the through hole of the measurement object and is supported rotatably, the movement restriction means can release and restrict the slide movement of the guide member, and the measurement spindle passes through the measurement object. In a state of being inserted into the hole and rotatably supported, adjustment can be made so that a predetermined measurement position on the inner peripheral surface of the measurement object coincides with a measurement position of the distance measuring means in the measurement spindle. Also, when measuring the inner peripheral surface of another position of the measurement object, the distance measurement means can be used while the measurement spindle is rotatably supported without pulling the measurement spindle from the through hole of the measurement object. The measurement position can be adjusted so that the other measurement positions of the through hole of the measurement object coincide with each other, and measurement can be performed. Furthermore, in the case of measuring the inner peripheral surface of a measurement object having an opening communicating with the outside around the inner peripheral surface to be measured, the measurement spindle is rotatably supported by operating the movement restricting means from the opening. In this state, the movement of the guide member is released and restricted, and the measurement can be performed by adjusting the measurement position of the distance measuring means and the other measurement positions of the through hole of the measurement object to coincide with each other.

  According to the above configuration, the inner peripheral surface measuring device is attached to the measurement object, and the shape of the inner peripheral surface of the through hole of the measurement object can be measured. The measurement results can be immediately analyzed and evaluated. Therefore, improvement in production efficiency in the production process of the measurement object can be expected.

  Further, the movement of the distance measuring means in the measuring spindle to the measuring position and the rotation of the measuring spindle are performed manually, and no mechanism for driving the distance measuring means from the outside is required in the measuring spindle. The outer diameter can be reduced. Therefore, it can be applied to the measurement of the inner peripheral surface of a measurement object such as a cylinder block of a small engine having a small inner diameter of the through hole.

  Further, since the distance measuring means is moved and the measuring spindle is manually rotated, the number of components is reduced and control software or the like is not required as compared with the case where they are driven externally. Therefore, the manufacturing cost of the inner peripheral surface measuring device can be reduced.

  Further, the movement restricting means of the inner peripheral surface measuring device has a guide member in a state having an operated portion on one end side exposed in the slit of the measuring spindle and an action portion on the other end side that can project from the guide member. Non-locking, where the working part protrudes from the guide member and is held in a locked position where it presses the inner surface of the cylindrical part of the measuring spindle, and the operated part is separated from the inner surface of the cylindrical part by operating the operated part You may have a movement control member which moves between a position and a lock position, and controls the movement of the guide member along a rotating shaft in a lock position.

  In the above configuration, when adjusting the measurement position of the distance measuring means, first, the operated portion of the movement restricting member that passes through the guide member and is held at the lock position is operated, and the measurement spindle protrudes from the guide member. The action part pressing the inner surface of the guide member is moved to the unlocked position, and the movement restriction of the guide member is released. Next, the guide member is manually slid to a predetermined position along the rotation axis of the measurement spindle. The position of the distance measuring means fixed to the guide member is confirmed by a distance scale attached to the string-like member inserted through the communication hole at the first end of the measuring spindle. Next, the operated part of the movement restricting member is operated, the action part of the movement restricting member is moved from the unlocked position to the locked position to press the inner surface of the measuring spindle, and the guide member moves in the direction along the rotation axis. To complete the preparation of the measurement position. When the measurement object has an opening communicating with the outside around the inner peripheral surface of the measurement object, the measurement spindle is inserted into the through hole of the measurement object and supported rotatably, By operating the operated portion of the movement restricting member from the opening around the surface, the movement of the guide member can be released and restricted, the measurement position of the distance measuring means can be adjusted, and the inner peripheral surface can be measured. . Also, when measuring the inner peripheral surface at other positions, the operated part of the movement restricting member is operated from the opening around the inner peripheral surface while the measurement spindle is rotatably supported. Thus, the movement of the guide member can be released and restricted to adjust the measurement position of the distance measuring means, and the inner peripheral surface at another position can be measured.

  On the other hand, if the measurement object does not have an opening around the inner peripheral surface of the measurement object, operate the operated part of the movement restricting member before inserting the measurement spindle into the through hole of the measurement object. By adjusting the measurement position of the distance measuring means, and when measuring the inner peripheral surface of other positions, the measurement spindle is once pulled out from the through hole of the measurement object, and the operated part of the movement restricting member is moved. It may be operated to adjust the measurement position of the distance measuring means to the measurement position on the inner peripheral surface of another position.

  According to the said structure, a guide member is pressed and locked by the inner surface of the cylindrical part of a measurement spindle by a movement control member. Therefore, the play between the guide member to which the distance measuring means is fixed and the measuring spindle is removed, the measuring position of the distance measuring means is stabilized, and the distance measuring accuracy can be further improved.

  According to the present invention, the inner peripheral surface measuring device can be applied to the inner peripheral surface measurement of a measurement object having a relatively small-diameter through hole, and can be easily used in the manufacturing process. The manufacturing cost of the apparatus can be reduced.

It is a block diagram of the internal peripheral surface measuring apparatus concerning embodiment of this invention. It is II-II arrow sectional drawing of FIG. It is a front view of the principal part of a measurement spindle.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The inner peripheral surface measuring device 1 of the present invention is a device that measures an inner peripheral surface such as a through hole that penetrates a cylinder block of a vehicle engine that is a measurement object, and obtains roundness and concentricity. As shown in FIG. 1, the cylinder block (measurement object) 2 has a through hole 3 provided with a plurality of bearing portions 64 that pivotally support a crankshaft (not shown). An opening 65 is provided around the bearing portion 64 to open to communicate with the outside of the cylinder block 2. The through hole 3 has a circular cross section that linearly penetrates the first end surface 2 a and the second end surface 2 b of the cylinder block 2.

  An inner peripheral surface measuring apparatus 1 according to an embodiment of the present invention includes a first support part (first support part) 5, a second support part (second support part) 17, a measurement spindle 29, and a guide block. (Guide member) 48 and a rotary encoder (rotation angle detection means) 61 are provided.

  The first support portion 5 includes a first base plate 6 and a first bearing housing 9. The first base plate 6 has a plate shape having a through-hole 7 having a circular cross section having an inner diameter larger than the outer diameter of the first bearing housing 9. A plurality of screw holes 8 are provided around the through hole 7 of the first base plate 6. Further, the first base plate 6 is provided with a plurality of bolt holes (not shown), and these bolt holes and an existing fixing hole (not shown) on the first end surface 2a of the cylinder block 2 are bolted. As a result, the first base plate 6 is detachably attached to the cylinder block.

  The first bearing housing 9 has a cylindrical shape that opens at both ends, and the back surface portion 11 at one end has an opening with an inner diameter smaller than the tip portion 10 at the other end, and is between the tip portion 10 and the back surface portion 11. Is formed with a flange portion 12 orthogonal to the central axis direction of the cylinder and extending in a direction away from the central axis, and the flange portion 12 is provided with a plurality of bolt holes 15. The outer diameter of the tip portion 10 is set slightly smaller than the inner diameter of the through hole 7 of the first base plate 6. The back surface portion 11 has a donut plate-like cover 13 having a through-hole having an outer diameter substantially equal to the outer diameter of the back surface portion and having an inner diameter smaller than the opening of the back surface portion 11 at the center portion. It is screwed to. A bearing support portion 14 having a substantially circular cross section is defined by the inner surface of the cover 13 and the inner peripheral surface of the back surface portion 11. In the first bearing housing 9, the distal end portion 10 is inserted into the through hole 7 of the first base plate, the outer peripheral surface of the distal end portion 10 and the inner peripheral surface of the through hole 7 of the first base plate are fitted, and the flange portion 12. The bolt holes 15 and the screw holes 8 of the first base plate 6 are fastened with bolts 16 to be fixed to the first base plate 6.

  The second support portion 17 includes a second base plate 18 and a second bearing housing 21. The second base plate 18 has a plate shape having a through-hole 19 having a circular cross section with an inner diameter larger than the outer diameter of the second bearing housing 21. A plurality of screw holes 20 are provided around the through hole 19 of the second base plate 18. Further, the second base plate 18 is provided with a plurality of bolt holes (not shown), and these bolt holes and an existing fixing hole (not shown) on the second end surface 2b of the cylinder block 2 are bolted. As a result, the second base plate 18 is detachably attached to the cylinder block.

  The second bearing housing 21 has a cylindrical shape that opens at both ends, and the back surface portion 23 at one end portion has an opening with an inner diameter smaller than that of the tip portion 22 at the other end portion, and between the tip portion 22 and the back surface portion 23. Is formed with a flange portion 24 that is orthogonal to the central axis direction of the cylinder and extends away from the central axis. The flange portion 24 is provided with a plurality of bolt holes 27. The outer diameter of the tip portion 22 is set slightly smaller than the inner diameter of the through hole 19 of the second base plate 18. The back surface portion 23 has a donut plate-like cover 25 having a centrally located through hole having an outer diameter substantially the same as the outer diameter of the back surface portion 23 and smaller than the opening of the back surface portion 23. It is screwed to the end face. A bearing support portion 26 having a substantially circular cross section is defined by the inner surface of the cover 25 and the inner peripheral surface of the back surface portion 23. In the second bearing housing 21, the distal end portion 22 is inserted into the through hole 19 of the second base plate, the outer peripheral surface of the distal end portion 22 and the inner peripheral surface of the through hole 19 of the second base plate are fitted, and the flange portion 24. The bolt hole 27 and the screw hole 20 of the second base plate 18 are fastened with bolts 28 and fixed to the second base plate 18.

  The measurement spindle 29 includes a spindle part (tubular part) 31, a first shaft part (first end part) 35 fixed to one end of the spindle part 31, and a second part fixed to the other end of the spindle part 31. And a shaft portion (second end portion) 41. In the measurement spindle 29, the spindle portion 31 is inserted into the through hole 3 of the cylinder block 2, and the first shaft portion 35 and the second shaft portion 41 are rotatably supported by the first support portion 5 and the second support portion 17, respectively. In the supported state, it rotates about a rotation shaft 30 substantially parallel to the through hole 3 of the cylinder block 2.

  The spindle portion 31 has a cylindrical shape extending along the direction of the rotation shaft 30, has an inner surface 32 substantially parallel to the direction of the rotation shaft 30, and slits 33 formed by cutting out the inner surface 32 have both end portions substantially parallel to the rotation shaft. It extends in the direction of For the spindle portion 31, a honing pipe having a smooth inner surface is used. The length of the slit 33 in the direction of the rotation shaft 30 enables measurement of the inner peripheral surface to both end surfaces of the through hole 3 of the guide block 2, so that the guide block 48 described later can be secured with a moving space. It is set longer than the distance between the first end surface 2a and the second end surface 2b of the block 2. The spindle portion 31 extends in the direction of the rotation shaft 30 outside the both ends of the slit 33, and female screw portions 34 are formed on the inner surfaces 32 of both ends of the spindle portion 31.

  The first shaft portion 35 has a cylindrical shape in which a shaft portion 36 and a coupling portion 38 having a larger outer diameter than the shaft portion 36 are integrally formed. A substantially annular bearing 37 is press-fitted into the outer peripheral surface of the shaft portion 36. A male screw portion 39 is formed on the outer peripheral surface of the coupling portion 38. By screwing the male screw portion 39 with a female screw portion 34 at one end of the spindle portion 31, the first shaft portion 35 is connected to the spindle portion. It is fixed to one end of 31. The second shaft portion 41 has a cylindrical shape in which a shaft portion 42 and a coupling portion 45 having an outer diameter larger than that of the shaft portion 42 are integrally formed. A substantially annular bearing 43 is press-fitted into the outer peripheral surface of the shaft portion 42. A communication hole 44 that communicates the outside with the inside of the spindle portion 31 is provided in the central portion of the shaft portion 42. A male screw portion 46 is formed on the outer peripheral surface of the coupling portion 45, and the second shaft portion 41 is connected to the spindle by screwing the male screw portion 46 with the female screw portion 34 at the other end of the spindle portion 31. It is fixed to the other end of the part 31.

  The guide block 48 has an outer diameter slightly smaller than the inner diameter of the spindle portion 31 of the measurement spindle 29 and has a cylindrical shape extending along the direction of the rotation axis 30 of the measurement spindle 29. In the guide block 48, the length in the direction of the rotation shaft 30 is shorter than the length in the direction of the rotation shaft 30 of the guide block 48, and the length in the width direction orthogonal to the rotation shaft 30 is slightly smaller than the width of the slit 33. A measuring block 49 having a small, substantially rectangular cross section is incorporated from the center of the guide block 48 so as to extend in the direction of the slit 33 of the spindle portion 31 at right angles to the rotating shaft 30, and to the tip portion (engaging protrusion). 50 enters the slit 33 and engages with the slit 33. When the distal end portion 50 of the measurement block 49 is engaged with the slit 33, the rotation of the guide block 48 around the rotation axis is restricted, and the guide block 48 slides along the slit 33 substantially in parallel with the rotation axis 30. can do.

  A displacement sensor (distance measuring means) 51 is fixed at the center of the measuring block 49 in the direction of the rotation axis 30. The measurement direction of the displacement sensor 51 is substantially orthogonal to the rotation shaft 30 and is directed to the inner peripheral surface 4 of the through hole 3 via the slit 33. When the measuring spindle 29 is inserted into the through hole 3 of the cylinder block 2 and is in the support state, the contact 52 of the displacement sensor 51 contacts the inner peripheral surface 4 of the through hole 3 of the cylinder block 2. The displacement sensor 51 detects the distance to the inner peripheral surface 4 that changes in a direction substantially orthogonal to the rotation axis as the measurement spindle 29 rotates as the displacement of the contact 52 that contacts the inner peripheral surface 4. Output. The signal cable 53 of the displacement sensor 51 extends from the displacement sensor 51 in the direction of the rotation shaft 30 and is inserted through the communication hole 44 of the second shaft portion 41.

  The guide block 48 is provided with a screw hole 57 in the direction of the inner surface 32 that is substantially orthogonal to the rotary shaft 30 and faces the slit 33 of the spindle portion 31. A position fixing bolt (movement restricting member) 54 for restricting the movement of the guide block 48 is screwed into the screw hole 57. The position fixing bolt 54 has an operated part 55 on one end side exposed in the slit 33 of the measuring spindle 29 and an action part 56 on the other end side that can project from the guide block 48. By rotating the operated portion 55 from the outside of the slit 33 with a driver (not shown) or the like, and moving the action portion 56 to the lock position protruding from the guide block 48, the inner surface 32 of the spindle portion 31 is pressed. The guide block 48 is pressed against the inner surface of the spindle portion 31, and the movement of the guide block 48 along the direction of the rotation axis 30 is restricted. Further, the operation restriction of the guide block 48 is released by rotating the operated portion 55 in the opposite direction and moving the action portion 56 to the unlocked position away from the inner surface 32 of the spindle portion 31, and the guide block 48 is rotated. It can be slid along the direction of the axis 30. The position fixing bolt 54 is held in the locked position in the normal state.

  From the central portion of the guide block 48, a scale (string member) 58 having one end fixed to the central portion extends substantially parallel to the rotary shaft 30 and is inserted through the communication hole 44 of the second shaft portion 41. The scale 58 has a string shape, is formed of glass fiber having flexibility and little expansion / contraction, and has a distance scale 59 in the length direction. A rotation lever 60 is attached to the outer periphery of the second shaft portion 41 of the measurement spindle 29 exposed to the outside from the second bearing housing 21 in a direction crossing the direction of the rotation shaft 30. A rotary encoder 61 is fixed to the outer surface of the back surface portion 11 of the first bearing housing 9. The rotary encoder 61 is arranged so that the rotation axis of the rotary encoder 61 is substantially the same as the rotation axis 30 of the measurement spindle 29, and is approximately from the rotating disk 62 coupled to the rotation axis of the rotary encoder 61 to the rotation axis of the rotary encoder 61. A phase pin 63 is erected in parallel. With the rotary encoder 61 fixed, the tip of the phase pin 63 is inserted into a pin hole 40 provided at the tip of the first shaft portion 35 of the measurement spindle 29. The position of the pin hole 40 is set to a position indicating a predetermined angle in the rotation direction around the rotation axis 30 of the measurement spindle 29, for example, the angle of the contact 52 of the displacement sensor 51.

  In the assembly stage of the inner peripheral surface measuring apparatus 1, the second shaft portion 41 of the measuring spindle 29 is inserted into the bearing support portion 26 of the second bearing housing 21 and is handled as one component as a whole. Between the inner surface of the cover 25 of the second bearing housing 21 and the bearing 43 of the second shaft portion 41, a substantially annular wave that applies pressure to the bearing 37 and the bearing 43 in order to ensure the rotational accuracy of the measuring spindle 29. A mold washer 47 is inserted. A rotation lever 60 for rotating the measurement spindle is fixed to the outer peripheral surface of the second shaft portion 41 exposed to the outside from the insertion hole 44 of the second bearing housing 21.

  Next, attachment of the inner peripheral surface measuring device 1 to the cylinder block 2 and measurement of the inner peripheral surface 4 of the through hole 3 of the cylinder block 2 will be described. First, the operator inserts the distal end portion 10 of the first bearing housing 9 into the through hole 7 of the first base plate 6 of the first support portion 5, and the bolt hole 15 of the flange portion 12 of the first bearing housing 9 and the first hole portion 15. The screw holes 8 of the base plate 6 are fastened with bolts 16 to fix the first bearing housing 9 to the first base plate 6, and the rotary encoder 61 is attached to the first bearing housing 9. Next, the first base plate 6 is fixed to the first end surface 2 a of the cylinder block 2 using an existing fixing hole provided in the first end surface 2 a of the cylinder block 2. Subsequently, the second base plate 18 is fixed to the second end surface 2b of the cylinder block 2 using an existing fixing hole provided in the second end surface 2b of the cylinder block. Next, from the second end face 2 b side of the cylinder block 2, the measurement spindle 29 is inserted into the through hole 3 of the cylinder block 2, and the spindle portion 31 of the measurement spindle 29 is inserted into the through hole 3 of the cylinder block 2. The shaft portion 36 of the first shaft portion 35 of the spindle 29 is inserted into and supported by the bearing support portion 14 of the first bearing housing 9 of the first support portion 5. When the first shaft portion 35 is inserted into the first support portion 5, the measurement spindle 29 or the rotary encoder 61 is arranged so that the phase pin 63 of the rotary encoder 61 is inserted into the pin hole 40 at the distal end portion of the first shaft portion 35. Adjust the rotation angle. After the first shaft portion 35 of the measurement spindle 29 is supported by the first support portion 5, the second shaft of the measurement spindle 29 is inserted into the through hole 19 of the second base plate 18 fixed to the second end surface 2 b of the cylinder block 2. The front end portion 22 of the second bearing housing 21 assembled in advance integrally with the portion 41 is inserted, and the bolt hole 27 of the flange portion 24 of the second bearing housing 21 and the screw hole 20 of the second base plate 18 are connected to the bolt 28. Then, the second bearing housing 21 is fixed to the second base plate 18. Thus, the mounting of the inner peripheral surface measuring device 1 to the cylinder block 2 is completed, and the measurement spindle 29 is rotatably supported by the first support portion 5 and the second support portion 17, and the through hole 3 of the cylinder block 2 is provided. It is possible to rotate around a rotation axis that is substantially parallel to the axis.

  Next, the guide block 48 along the rotary shaft 30 is arranged so that the measurement position of the inner peripheral surface 4 of the through hole 3 and the measurement position of the displacement sensor 51 fixed to the measurement block 49 in the measurement spindle 29 coincide. Adjust the position. That is, a tool such as a screwdriver is inserted from the opening 65 of the cylinder block 2 and the operated portion 55 of the position fixing bolt 54 of the guide block 48 held in the locked position in the normal state is rotated. The movement of the guide block 48 is released by moving the operating portion 56 to the unlocked position. Next, the guide block 48 is manually slid along the rotation axis 30 of the measurement spindle 29 to the measurement position corresponding to the measurement position of the inner peripheral surface 4 of the through hole 3. The measurement position of the displacement sensor 51 fixed to the measurement block 49 is confirmed by the distance scale 59 of the scale 58 that is exposed to the outside through the communication hole 44 of the second shaft portion 41 of the measurement spindle 29. Next, the operated portion 55 of the position fixing bolt 54 is rotated in the opposite direction, the action portion 56 of the position fixing bolt 54 is moved from the unlocked position to the locked position, and the inner surface 32 of the measuring spindle 29 is pressed to rotate the rotating shaft. The movement of the guide block 48 in the direction along 30 is restricted. Thus, the adjustment of the position of the displacement sensor 51 is completed. Next, the rotation lever 60 is operated to rotate the measurement spindle 29 once around the rotation axis 30 of the measurement spindle 29. The displacement measurement data output from the displacement sensor 51 as the measurement spindle 29 rotates and the rotation angle data of the measurement spindle 29 output from the rotary encoder 61 are input to a computer (not shown) and processed.

  Subsequently, when measuring the inner peripheral surface 4 at another measurement position of the through hole 3 of the cylinder block 2, a tool such as a screwdriver is inserted from the opening 65 of the cylinder block 2, and the position fixing bolt of the guide block 48 is inserted. 54 is rotated to move the action portion 56 of the position fixing bolt 54 from the locked position to the unlocked position, thereby releasing the movement restriction of the guide block 48. Subsequently, the guide block 48 is manually slid so that the measurement position of the displacement sensor 51 coincides with another measurement position of the through hole 3 of the cylinder block 2. The measurement position of the displacement sensor 51 after the movement is confirmed on the distance scale 59 of the scale 58. Next, the position fixing bolt 54 is moved to the lock position, and the movement of the guide block 48 is restricted. Subsequently, the measurement spindle 29 is rotated around the rotation axis 30 to measure the inner peripheral surface 4 at other measurement positions. The above is repeated at a necessary measurement position of the through hole of the cylinder block. The computer or the like stores the displacement measurement data and the rotation angle measurement data in association with each other, and obtains the roundness at each measurement position in the penetration direction of the through hole 3 and the concentricity between the measurement positions from the stored data.

  According to the present embodiment, the guide block 48 to which the displacement sensor 51 is fixed slides manually on the inner surface 32 of the measurement spindle 29, and therefore a special mechanism for driving the displacement sensor 51 inside the measurement spindle 29. The measuring spindle 29 can have a relatively small outer diameter. Therefore, the inner peripheral surface measuring device 1 can be applied to the measurement of the inner peripheral surface of a measurement object such as a cylinder block of a small engine having a small inner diameter of the through hole.

  Moreover, since the inner peripheral surface measuring apparatus 1 can be detachably attached to a measuring object such as a cylinder block and can measure the shape of the inner peripheral surface of the through hole of the measuring object, the measuring object is manufactured. It can be used conveniently in the manufacturing process, etc., and the measurement result can be immediately analyzed and evaluated. Therefore, improvement in production efficiency in the production process of the measurement object can be expected.

  Further, since the displacement sensor 51 is manually moved along the direction of the rotation shaft 30 and the measurement spindle 29 is rotated, a complicated control mechanism is not required as compared with the case where the displacement sensor is driven externally, and the component parts are reduced. Less control software is required. Therefore, the manufacturing cost of the inner peripheral surface measuring device 1 can be reduced.

  Further, the guide block 48 is pressed and locked to the inner surface 32 of the measurement spindle 29 by the operation of the position fixing bolt 54. Therefore, the backlash between the guide block 48 to which the displacement sensor 51 is fixed and the inner surface 32 of the measurement spindle 29 is removed via the measurement block 49, the measurement position of the displacement sensor 51 is stabilized, and the displacement measurement accuracy is improved. It can be improved further.

  In this embodiment, the rotation angle of the measurement spindle 29 is measured by the rotary encoder 61. However, instead of the rotary encoder 61, an inner peripheral surface is measured by using an angle display panel or the like displaying a predetermined measurement angle. The inner peripheral surface measurement may be performed by limiting the measurement angle to be performed.

  In this embodiment, a contact-type displacement sensor is used as the displacement sensor 51. However, a non-contact-type displacement sensor may be used.

  Moreover, the movement restriction | limiting of the direction along the rotating shaft 30 of the guide block 48 is not limited to the press of the inner surface 32 by the action part 56 of the position fixing bolt 54, For example, you may press by urging | biasing force, such as a spring.

  Further, when measuring the inner peripheral surface of the measurement object that does not have an opening communicating with the outside around the inner peripheral surface, the guide block 48 is inserted before the measurement spindle 29 is inserted into the through hole of the measurement object. By operating the position fixing bolt 54, the measurement position of the displacement sensor 51 is adjusted in advance so as to coincide with the measurement position of the inner peripheral surface, and when measuring the inner peripheral surface of other positions, measurement is performed. The spindle 29 may be pulled out from the through hole of the measurement object, and the position fixing bolt 54 of the guide block 48 may be operated to adjust the measurement position of the displacement sensor 51 to the measurement position on the inner peripheral surface at another position.

  Further, a structure for restricting the slide movement of the guide block 48 may be provided at a place where the measurement spindle 29 can be operated from the outside in a state where the measurement spindle 29 is inserted into the through hole of the measurement object and is rotatably supported. For example, instead of the position fixing bolt 45, a scale holding portion that can be set to a holding state that restricts the movement of a portion of the scale 58 that is exposed to the outside through the communication hole 44 and a released state that allows the movement. Are provided on the outer surface of the second shaft portion 41 that can be operated from the outside. In this case, if the scale holding unit is set to the released state and the scale 58 is moved up and down to change the vertical position of the guide block 48 along the rotation shaft 30, the scale holding unit is set to the holding state. Good. In this way, by restricting and releasing the sliding movement of the guide block 48 in the rotation axis direction using the scale 58, whether or not the measurement object has an opening communicating with the outside around the inner peripheral surface. Regardless, the measurement position of the displacement sensor 51 can be adjusted in a state where the measurement spindle 29 is inserted into the through hole of the measurement object and is rotatably supported.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  The present invention can be widely applied as an inner peripheral surface measuring device of a through hole.

1 Inner peripheral surface measuring device 2 Cylinder block (object to be measured)
2a 1st end surface 2b 2nd end surface 3 Through-hole 4 Inner peripheral surface 5 1st support part (1st support part)
6 1st base plate 9 1st bearing housing 17 2nd support part (2nd support part)
18 Second base plate 21 Second bearing housing 29 Measuring spindle 30 Rotating shaft 31 Spindle part (tubular part)
32 Inner surface 33 Slit 35 First shaft portion (first end portion)
41 Second shaft portion (second end)
44 Insertion hole 48 Guide block (guide member)
50 Tip (engaging protrusion)
51 Displacement sensor (distance measuring means)
54 Position fixing bolt (movement restriction member)
55 Operated part 56 Action part 58 Scale (string-like member)
59 Distance scale 61 Rotary encoder (Rotation angle detection means)

Claims (2)

An inner peripheral surface measuring device that measures the shape of the inner peripheral surface of the through hole of the measurement object having a through hole with a circular cross section that linearly penetrates the first end surface and the second end surface,
A first support member detachably attached to the first end surface;
A second support member removably attached to the second end surface;
A cylindrical portion that is inserted through the through hole, and fixedly provided at both ends of the cylindrical portion, and each of the first and second support members is rotatable about a rotation axis that is substantially parallel to the through hole. The cylindrical portion has an inner surface that extends substantially parallel to the rotating shaft, and a slit that extends substantially parallel to the rotating shaft by cutting out a part of the inner surface. And the first end has a communication hole that communicates the outside with the inside of the cylindrical portion, and at least one of the first and second ends is exposed to the outside. When,
It has an engaging projection that is arranged inside the cylindrical portion of the measuring spindle and engages with the slit so as to be slidable along the rotation axis. By engaging the engaging projection with the slit, A guide member that is restricted from rotating about the rotation axis;
A movement restricting means for releasably restricting the sliding movement of the guide member along the rotation axis;
A distance scale is provided along the length direction, and extends substantially parallel to the rotation shaft from one end fixed to the guide member at a position facing the communication hole of the first end, and is inserted through the communication hole. A string member;
The measurement spindle is fixed to the guide member, has a measurement direction substantially orthogonal to the rotation axis and directed to the inner peripheral surface of the through hole through the slit of the measurement spindle, and the measurement spindle rotates about the rotation axis Distance measuring means for measuring the distance to the inner peripheral surface along the circumferential direction of the inner peripheral surface,
An inner peripheral surface measuring device, comprising: a rotation angle detecting means fixed to one of the first and second support members and detecting a rotation angle of the measurement spindle. It is an internal peripheral surface measuring apparatus of Claim 1, Comprising:
The movement restricting means penetrates the guide member in a state having an operated portion on one end side exposed in the slit of the measurement spindle and an action portion on the other end side that can project from the guide member, and The part protrudes from the guide member and is held at a lock position that presses the inner surface of the cylindrical part of the measuring spindle, and the operation part is separated from the inner surface of the cylindrical part by operating the operated part. An inner peripheral surface measurement device comprising: a movement restricting member that moves between a lock position and the lock position and restricts movement of the guide member along the rotation shaft at the lock position.

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