JP5840944B2 - Loading device and torque setting device for torque tool - Google Patents

Description

  The present invention relates to a loading device that holds a torque tool such as a torque driver and applies a tightening torque, and a set torque measuring device such as a torque tool tester provided with the loading device.

  A torque driver, which is one of the torque tools, rotates the grip portion in the screw tightening direction, and when a set torque value is reached, the torque limiter is activated and transmission of the screw tightening force is cut off.

  A torque driver tester has been proposed as a device for measuring the set torque value of such a torque driver. The torque driver tester has a sensor shaft extending in the vertical direction fixed to the tester body so that it cannot rotate. A sensor such as a strain gauge is attached to the sensor shaft, and the torque value is calculated based on detection information from the sensor. The detected torque value is displayed on the display.

  A torque driver main shaft to be measured is fitted with a bit that engages the sensor shaft, the bit is engaged with the sensor shaft, and the axis of the torque driver is aligned with the axis of the sensor shaft. And keep it vertical. The torque value when the torque driver's torque limiter is operated by rotating the grip portion of the torque driver is read by the display. In such a measurement, the torque driver is continuously rotated, and the torque limiter is operated a plurality of times.

  There has been proposed a loading device that holds a torque driver perpendicular to a driver tester body and applies a rotational force (Patent Document 1).

  The loading device has a configuration in which a ball bearing arranged in a horizontal direction is attached to a fixed frame fixed to a driver tester body, and an operation ring for holding a torque driver is fixed to an inner race portion of the ball bearing. In the torque driver, a grip portion is fixed to the operation ring in a state where the axis of the main shaft and the axis of the sensor shaft are aligned, and by rotating the operation ring, the axis of the torque driver is adjusted to the axis of the sensor shaft. The grip portion of the torque driver is rotated while maintaining the state matched with the core.

JP-A-10-122999

  However, when the bit attached to the main shaft of the torque driver is engaged with the screw and tightened, and when the bit is engaged with the sensor shaft and the torque driver is rotated, as shown in FIG. The torque driver 20 is tilted and rotated with respect to the axis L1 of the sensor shaft (screw) 31 of the torque driver tester 30. Such a phenomenon occurs, for example, as shown in FIG. 4B, the inner surface 22 of the hexagonal hole of the bit 21 attached to the main shaft of the torque driver 20 and the outer peripheral surface of the hexagonal sensor shaft 31. When the torque driver 20 is rotated, a plurality of corners of the sensor shaft 31 come into contact with the inner peripheral surface 22 of the bit 21 as shown in FIG. The rotational torque is transmitted to the sensor shaft 31.

  Here, the direction of the reaction force received by the inner peripheral surface 22 of the bit 21 due to contact with a plurality of corners of the sensor shaft 31 is different and the magnitude is different. Is deviated from the axis L1 of the sensor shaft 31. As shown in FIG. 4D, the torque driver 20 is inclined with respect to the axis L1 of the sensor shaft 31 so as to absorb this deviation. When the measurement is performed by continuously turning the torque driver, the torque driver may cause a so-called swinging phenomenon with the bit as a fulcrum.

  In this way, measuring the set torque value with the grip portion 23 of the torque driver 20 fixed to the operation ring and forcibly suppressing the tilt generated in the torque driver 20 is the actual use state of the torque driver. In contrast, there are cases where the measurement of the set torque value suitable for actual use is not necessarily performed.

  An object of the present invention is to provide a loading device for applying a rotational force while allowing a torque tool such as a torque driver to cause a behavior of the torque tool such as a torque driver generated in an actual tightening operation, and a set torque suitable for the actual use of the torque tool. An object of the present invention is to provide a torque setting device for a torque tool capable of measuring a value.

  According to the embodiment shown in FIG. 1, the configuration of the loading device that realizes the object of the present invention is to apply a torque tool by holding a torque tool and rotating the torque tool around the axis of a tightening shaft of the torque tool. A loading device 1 that applies rotational torque to a member. And holding means 6 for holding the torque tool in a non-rotatable manner, rotation transmitting means 7 for transmitting rotation around the axis of the fastening shaft to the holding means 6, and holding means for the rotation transmitting means 7. 6 is a support means (10, 12,..) That supports the shaft 6 so as to be rotatable about an orthogonal axis perpendicular to the axis of the fastening shaft and to be movable in any direction within a plane around the axis of the fastening shaft. 13).

  Further, the configuration of the torque tool setting torque measuring device that realizes the object of the present invention, according to the embodiment shown in FIGS. 2 and 3, is the measuring device main body 33 to which the loading device having the above-described configuration is attached, and the loading device. A sensor shaft 31 fixed to the apparatus main body 33 with which an engagement member 21 mounted on a tightening shaft of the torque tool 20 held by 1 is engaged, and a sensor provided on the sensor shaft 31; The torque tool 20 is rotated, and a set torque value set in the torque tool 20 is measured based on detection information of the sensor.

  According to the loading device of the present invention, for example, a bit attached to a torque driver is engaged with a screw, and the torque driver tilts and eccentricity generated when the screw is tightened by rotating the torque driver is forcibly suppressed. Without being fixedly held, the torque driver can be rotated while allowing the torque driver to tilt or decenter.

  In addition, a spherical engagement portion provided in the holding means as a shaft support means, and an engagement hole provided in the rotation transmission means with which the engagement portion engages with play in the rotation transmission direction. By doing so, the holding means can be moved and tilted smoothly.

  For this reason, the torque limiter of the torque driver can be operated in a state suitable for actual tightening, and if used for tightening the screw, the screw can be tightened with a set torque value with high accuracy. When used in a set torque measuring device such as a driver tester, the set torque value of a torque tool such as a torque driver can be measured in accordance with the actual use situation, and measurement with very little measurement error can be performed.

1 shows an embodiment of a loading apparatus according to the present invention, where (a) is a top view, (b) is a front view, (c) is a right side view of (b), and (d) is an AA arrow view of (b). The figure, (e) is a BB arrow line view of (b). The torque driver tester equipped with the loading apparatus of FIG. 1 is shown, (a) is a front view, (b) is a right view of (a). The top view of the torque driver tester of FIG. It is a figure explaining the inclination phenomenon accompanying the tightening operation | movement of a torque driver, (a) is a front view which shows the state which the torque driver inclined with respect to the axial center of the sensor shaft of a torque driver tester, (b) is an inner peripheral surface of a bit The figure which shows the size of a sensor axis | shaft, (c) is CC arrow directional view of (b), (d) is sectional drawing which shows the relationship between the bit and sensor axis in the state which the torque driver inclined.

  Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

  FIG. 1 shows an embodiment of a loading device, (a) is a top view, (b) is a front view, (c) is a right side view of (b), and (d) is an AA arrow view of (b). The figure and (e) are BB arrow line views of (b).

  The loading device 1 has a mounting body 2 formed in a cylindrical shape with both upper and lower ends opened, and for example, as shown in FIG. 2, the mounting body 2 is detachably fixed to a tester body 32 of a torque driver tester 30. The lower opening 2a of the mounting body 2 is mounted on the mounting base 33 arranged around the sensor shaft 31 of the tester body 32, and the fixing screw 3 is tightened, whereby the shaft core L3 of the loading device 1 is moved to the shaft core L1 of the sensor shaft 31. To match.

On the inner peripheral surface of the mounting body 2, an inner cylinder 4 having upper and lower ends is disposed, and a ball bearing 5 is attached to an upper end portion. A viewing window 2c is formed on the mounting body 2 so that the sensor shaft 31 can be visually recognized through the viewing window 2c from the outside, so that the bit 21 of the torque driver 20 can be easily engaged with the sensor shaft 31. I have to. The inner cylinder 4 is also provided with the same opening 4a as the observation window 2c.

  The loading device 1 includes a fixed table 6 that is a holding unit to which the torque driver 20 is attached, and a guide body 7 that is a rotation transmission unit that holds the fixed table 6 in an unfixed state. In the guide body 7, the fitting portion 8 formed in a cylindrical shape is fitted to the inner ring portion of the ball bearing 5 through the upper opening 2 b of the attachment body 2, and rotates around the shaft core L <b> 3 with respect to the attachment body 2. In addition, a gear part is provided in the outer peripheral part of the guide body 7, the gear which rotates a motor or a manual rotation, and the said gear part is meshed, and the guide body 7 is rotated by a motor or a manual.

  In the guide body 7, a guide 9 that accommodates the fixed table 6 is integrally formed on the upper portion of the fitting portion 8. The guide 9 is formed in a substantially planar running track shape in which arc portions 9b are formed at both ends of a pair of opposing linear portions 9a, and a rising portion 9c is provided on the outer peripheral edge. In addition, let the length direction of the linear part 9a be a Y-axis direction, and let the direction orthogonal to the Y-axis direction in a horizontal plane be an X-axis direction.

  A shaft hole 10 is formed along the Y-axis direction in the rising portion 9c at the outermost peripheral portion of each arc portion 9b facing each other. The shaft hole 10 is formed in a long groove shape in which an engagement portion 12 described later has play along the axis L3.

  The fixed table 6 has a substantially planar running track shape substantially similar to the guide 9 and has a table body 11 formed smaller than the guide 9 and a torque driver fixing portion 15 disposed on the upper portion of the table body 11.

  The table body 11 is formed with arc portions 11b at both ends of a pair of opposing linear portions 11a, and an engaging portion 12 having a spherical tip at the outermost periphery of both arc portions 11b along the Y-axis direction. Deploy. The engaging portion 12 is formed at the tip of the screw portion 12a, and the screw portion 12a is screwed to the table body 11. The engaging portion 12 is loosely fitted in the shaft hole 10 and makes the table main body 11 rotatable about the axis connecting the pair of engaging portions 12 (rolling operation). Further, the table main body 11 is movable until the engaging portion 12 contacts the inner peripheral wall surface of the long groove-shaped shaft hole 10.

  Since the table body 11 is supported in a point contact state with the shaft hole 10 of the guide 9 via the spherical engaging portion 12, the table body 11 can be smoothly rolled and moved, and the guide body 7 Rotational force is transmitted to the table body without loss.

Support springs 13 made of leaf springs are attached to both shoulder portions of both arc portions 11b of the table body 11, and the tip end portions of the support springs 13 abut on the inner peripheral surface of the rising portion 9c of the opposing guide 9. The plurality of support springs 13 elastically support the table body 11 with respect to the guide 9, and the axis of the table body 11 is made to coincide with the axis L 3 of the attachment body 2.

  A through hole 14 through which the torque driver 20 passes is formed at the center of the table body 11, and the biasing forces of the plurality of support springs 13 are applied in a direction in which the center point of the through hole 14 coincides with the axis L <b> 3 of the attachment body 2. The shaft core of the through-hole 14 and the shaft core of the attachment body 2 are made to correspond in the state which acted and the torque driver 20 was set. When the guide body 7 is rotated for measurement, the support spring 13 is deformed in accordance with the movement of the torque driver 20 and assists the self-supporting of the torque driver 20.

  The support spring 13 is brought into line contact with the rising portion 9c using a leaf spring, and the table main body 11 can smoothly roll and relatively rotate between the table main body 11 and the guide 9 around the vertical axis. As long as rotation can be obtained smoothly, it is not limited to a leaf spring, and an elastic body such as a spring or rubber may be used.

The torque driver fixing portion 15 grips and fixes the torque driver 20 along the vertical direction. Members constituting the torque driver fixing portion 15 around the axis of the transmural hole 14, are disposed in point symmetry on the left and right, when the rotation operation dial 16a, 16b in a clockwise direction, is fixed to table body 11 shaft bearings 17a, rotatably supported to 17b have been tightened screws 18a, 18b are rotated, the saddle 19a which is opposed to the left and right, 19b are screwed toward the axis of the transmural hole 14. The tightening screws 18a and 18b are formed with a threaded portion on the base end side, and are screwed into the saddles 19a and 19b. Further, the front end side of the tightening screws 18a and 18b is a non-screw forming portion in which no screw portion is formed. Guide the movement along the direction.

  Fitting members 19c and 19d are formed on the saddles 19a and 19b. The fitting members 19c and 19d are formed on the front surface with fitting concave portions that are fitted on the outer circumferential surface of the grip portion 23 of the torque driver 20 and a plurality of protruding ridges 23a along the circumferential direction. It has been. Then, the saddles 19a and 19b are screwed and the fitting members 19c and 19d are fitted to the protrusions 23a of the grip portion 23 so that the axis of the torque driver 20 is aligned with the axis of the through hole 14. The grip portion 23 is gripped from both the left and right sides, and the torque driver 20 is gripped and fixed in a vertical posture.

  When the operation dials 16a and 16b are rotated in the counterclockwise direction, the left and right saddles 19a and 19b are moved away from each other, and the gripping of the grip portion 23 is released.

  The position of the saddles 19a, 19b in the left-right direction with the axis of the through hole 14 as the center can be confirmed by providing the scale portion 12b indicating the screwing positions of the left and right saddles 19a, 19b on the surface of the table body 11. I am doing so.

  The grip portion 23 of the torque driver 20 is fitted and gripped by the fitting members 19c and 19d. However, the present invention is not limited to this configuration, and the axis of the torque driver 20 is the axis of the sensor shaft 31. Any configuration can be used as long as the grip portion 23 can be fixed in a state of being matched with the core. Further, the torque driver fixing portion 15 is not limited to the above-described configuration, and the grip portion 23 of the torque driver 20 cannot be rotated in a state where the axis L2 of the torque driver 20 is aligned with the axis of the fixing table 6. Any configuration may be used as long as it can be held.

  As shown in FIG. 2, the loading device 1 having the above-described configuration attaches the mounting body 2 to the mounting base 33 of the torque driver tester 30 and tightens the fixing screw 3 so that the axis of the loading device 1 is the sensor shaft 31. To be aligned with the axis L1. The mounting body 2 may be fixed to the tester body 32 in any way as long as the axis of the fixed torque driver 20 can be aligned with the axis L1 of the sensor shaft 31. It may be possible to fix to the tester body 32 via Moreover, what is necessary is just to set the length of the attachment body 2 according to the length of the torque driver 20 to measure.

  After mounting and fixing the loading device 1 to the tester body 32, the torque driver 20 to be inspected is inserted from above the loading device 1 through the torque driver through hole 14 of the fixed table 6, and the bit 21 is attached to the sensor shaft 31 as shown in FIG. Engage. The grip portion 23 of the torque driver 20 is gripped by the torque driver fixing portion 15, and the torque driver 20 is fixed to the loading device 1 in a vertical posture in a state where the axis of the torque driver 20 and the axis of the sensor shaft 31 are matched. To do.

  When the guide body 7 of the loading device 1 is rotated, for example, in the clockwise direction, the inner peripheral wall surface of the shaft hole 10 of the guide body 7 comes into contact with the spherical engagement portion 12 provided on the fixed table 6, and the torque driver 20 Torque is applied to the shaft 31.

A force is applied to the torque driver 20 in a tilting direction as shown in FIG. 4 by the reaction torque from the sensor shaft 31. Since the fixed table 6 that fixes the torque driver 20 via the torque driver fixing portion 15 is capable of rolling with respect to the rotating guide body 7, the torque driver 20 is allowed to tilt, and the bit 21 of the torque driver 20 allows Torque is applied to the sensor shaft 31.

  When the guide body 7 is rotated in this inclined state, the shaft core of the torque driver 20 moves around the shaft core L1 while being eccentric from the shaft core L1 of the sensor shaft 31. At this time, the table main body 11 of the fixed table 6 is supported by the guide body 7 via the support spring 13 so as to be movable in an arbitrary direction within a horizontal plane. It moves in the horizontal plane while allowing, and the eccentric operation of the torque driver 20 is also allowed.

  Therefore, the torque driver 20 applies torque to the sensor shaft 31 without being restrained from the inclination caused by the tightening operation and the eccentric behavior in the horizontal plane, and the set torque in the same state as that during actual screw tightening. The value is measured.

  As a configuration of the torque limiter of the torque driver 20, for example, a bit is replaceably attached to a fixing member that rotates integrally with the grip portion 23 and cannot move in the axial direction, and a main shaft (a coupler fixed to a tip end portion of the main shaft). ) And a moving member that can move in the axial direction, a steel ball disposed between the fixed member and the movable member, and a torque value setting that biases the moving member toward the fixed member And a spring. The fixing member is formed with a plurality of cam holes along the circumferential direction in which the steel ball partially enters, and the rotating member is formed with a fitting hole portion in which the steel ball is partially loosely fitted. It is transmitted in the order of fixed member → cam hole → steel ball → fitting hole → moving member → main shaft → coupler → bit.

  When the reaction torque increases and reaches the set torque value set by the spring force of the torque value setting spring and the cam surface of the cam hole, the steel ball comes off the cam hole and the torque transmission is cut off. When the grip portion is further rotated, the steel ball is fitted into the next cam hole. The torque value of the torque driver 20 is measured for all the cam holes, and since this is performed a plurality of times, the torque driver 20 is continuously rotated a plurality of times. Based on the data detected by the sensor provided on the sensor shaft 31, the peak of the torque value is calculated and displayed on the display unit 34, and the average value of a plurality of peak torque values for each cam hole is displayed on the display unit 34, and the memory To record.

  In this way, the loading device 1 is free to perform a rolling operation and a sliding operation in an arbitrary direction within a horizontal plane with respect to the guide body 7 on which the fixed table 6 rotates. For this reason, even if the torque driver 20 is rotated at least once with respect to the sensor shaft 31 by the loading device 1 of the present embodiment, the torque driver 20 is restrained from being tilted by the tightening operation and being eccentric in the horizontal plane. Thus, torque can be applied to the sensor shaft 31, and the set torque value for each of the plurality of cam holes can be measured in accordance with the actual tightening operation.

  In addition, although the above-described embodiment is intended for a torque driver, it may be a torque tool such as a torque wrench. In addition, the loading device of the present embodiment can be applied to a device that grips and fixes a torque driver and tightens a screw or the like, for example.

  Furthermore, although the torque driver is held in a vertical posture, the present invention can also be applied to a case where the torque driver is held in a horizontal posture.

  In short, the loading device according to the present embodiment has a tilt or torque generated in the torque tool by a reaction torque generated from the torque applied member when a torque is applied to the torque applied member such as a screw or a sensor shaft by the torque tool. Any configuration that allows the eccentricity of the axis of the tool may be used.

  Further, although the bit 21 on the torque tool side has a hole shape and the sensor shaft 31 on the tester side has an axial shape, the bit 21 may have an axial shape and the sensor shaft may have a hole shape.

L1 Shaft core 1 Loading device 2 Attachment body 2a Lower opening 2b Upper opening 2c Viewing window 3 Fixing screw 4 Inner cylinder 4a Opening 5 Ball bearing 6 Fixed table (holding means)
7 Guide body (rotation transmission means)
8 fitting portion 9 guide 9a linear portion 9b arc portion 9c rising portion 10 shaft hole 11 table body 11a linear portion 11b arc portion 12 engaging portion 12a screw portion 12b scale portion 13 support spring 14 through hole 15 torque driver fixing portion 16a, 16b Operation dials 17a and 17b Shaft support portions 18a and 18b Clamping screws 19a and 19b Saddles 19c and 19d Fitting member 20 Torque driver 21 Bit 22 Hexagonal hole inner surface 23 Grip portion Projection line 23a
30 Torque driver tester 31 Sensor shaft 32 Tester body 33 Mounting base 34 Display unit

Claims (5)

A loading device that holds a torque tool and rotates the torque tool around an axis of a tightening shaft of the torque tool to apply a rotational torque to a torque application member;
Holding means for holding the torque tool unrotatable;
Rotation transmission means for transmitting rotation about the axis of the fastening shaft to the holding means;
The rotation transmitting means is supported by the holding means so as to be rotatable about an orthogonal axis perpendicular to the axis of the clamping shaft, and is movable in any direction within a plane around the axis of the clamping axis. and support means for supporting and possess,
The support means includes a shaft support means that supports the holding means with play at both ends along the orthogonal axis, and an elastic body that elastically supports the holding means toward the axis of the clamping shaft. loading device, characterized in that the organic and. The shaft support means includes a spherical engagement portion provided in the holding means, and an engagement hole provided in the rotation transmission means with which the engagement portion engages with play in the rotation transmission direction. The loading device according to claim 1 , further comprising: Loading device according to claim 1 or 2, characterized in that it has a mounting member for rotatably supporting said rotation transmitting means. The torque tool is a torque driver, and the holding means holds the grip portion of the torque driver in a state where the axis of the torque driver coincides with the axis of the holding means. loading device according to any one of the three. A measuring instrument which loading device is mounted according to any one of claims 1 to 4,
A sensor shaft fixed to the measurement device main body with which an engagement member attached to a tightening shaft of a torque tool held by the loading device is engaged;
A sensor provided on the sensor shaft;
And a torque tool setting torque measurement device for measuring a setting torque value to be set for the torque tool based on detection information of the sensor by rotating the torque tool.

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