JPH10113827A - Fastening of adjust nut, and fastening preload measuring method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the fastening of an adjust nut, and the fastening preload measuring workability, and improve the fastening preload measuring accuracy. SOLUTION: For a front axle in which a hub is supported by a tapered-roller bearing relative to a knuckle, and an adjust nut is fitted on the end part of the knuckle and clamped, the adjust nut is fastened, and a device for measuring the fastening preload is provided. Then, the fastening preload is automatically measured by plural fastening preload measuring means 26 following the front axle 20 supported on an assembling conveyor 21 to be moved, while the adjust nut is automatically fastened by plural nut runners 24 following the front axle 20 to be moved until the fastening preload reaches a specified value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for tightening an adjust nut in an axle of a vehicle and measuring the tightening preload, and more particularly to an improvement in workability of tightening and tightening preload measurement. The present invention relates to a technique for improving the accuracy of tightening preload measurement.

[0002]

2. Description of the Related Art An axle of a vehicle, for example, a front axle is configured as shown in FIG. That is, the front axle 1 includes the axle body 2, the knuckle 3, the tie rod 4, and the hub 5. The knuckle 3 and the axle body 2 are connected by a king pin 6, and the movement of the right knuckle is transmitted to the left knuckle by the tie rod 4. The hub 5 is a knuckle 3
Are supported by two inner and outer tapered roller bearings 7A and 7B. An adjust nut 13 is screw-fitted to the end of the knuckle 3 and tightened with a predetermined tightening force. The hub 5 includes a brake drum 8 and a disc wheel 9, a hub bolt 10 and two nuts 11,
The hub 5 is integrally fastened together with the brake drum 8 and the disc wheel 9 (see Japanese Utility Model Laid-Open No. 51-39901 and Japanese Utility Model Laid-Open No. 2-121306). .

By the way, the adjusting nut 13 is
It is necessary to tighten the tapered roller bearing 7B so as to obtain a predetermined tightening preload, and to make the rotational torque of the brake drum 8 appropriate. Therefore, from the viewpoint of facilitating preload adjustment work and improving the accuracy of tightening preload measurement, automatic adjustment of tightening preload by adjusting nut tightening torque control has been performed (JP-A-7-237402). Etc.).

[0004]

However, in such automatic adjustment by the control of the tightening torque of the adjusting nut, when the tapered roller bearing 7B is large, the tightening torque of the adjusting nut and the tightening preload are not adjusted. The correlation was weak, and there was variation in the tightening preload.

In view of the above-mentioned conventional problems, the present invention automatically adjusts an adjustment nut and measures a tightening preload by preload control while following a workpiece on an assembly line. By doing
An object of the present invention is to improve workability of tightening and tightening preload measurement and improve accuracy of tightening preload measurement.

[0006]

According to the first aspect of the present invention, a rotating member is supported on a shaft member by a bearing, and an adjusting nut is screwed to an end portion of the shaft member and tightened. A method for tightening the adjust nut and measuring the tightening preload on the work which has been adjusted as described above, wherein the adjust nut is moved by tightening means that moves following a plurality of work positions supported by a support portion. Of 1
Automatically tightening the adjusting nut, automatically returning the tightening of the adjust nut, and rotating the rotating member by following the plurality of work positions while rotating the rotating member. Means for automatically tightening the adjust nut by means, and measuring the tightening preload by the tightening preload measuring means that moves following the plurality of workpiece positions, until the tightening preload reaches a predetermined value. Automatically tightening the adjust nut by the tightening means.

In this way, for example, even if a large bearing having a weak correlation between the tightening torque and the tightening preload is used, the tightening preload is set to an appropriate value.
The invention according to claim 2 includes means for detecting a tightening torque of the adjust nut, and includes a step of recording tightening data including the detected tightening torque and tightening preload and performing a statistical process.

[0008] In this case, the tightening preload can be properly performed. According to a third aspect of the present invention, a rotating member is supported by a bearing on a shaft member, and an adjusting nut is screwed to an end of the shaft member to tighten the adjusting member. A device for performing attachment and measuring this tightening preload,
An apparatus main body supported by a moving unit that moves following a plurality of work positions supported by a support unit, a tightening unit provided on the apparatus main body, and tightening the adjust nut;
A rotating means provided in the apparatus main body, for rotating the rotating member, a tightening preload measuring means for measuring a tightening preload of the adjusting nut, and measuring the tightening preload until the tightening preload reaches a predetermined value. Tightening control means for tightening the adjustment nut by the tightening means,
It was comprised including.

With this configuration, for example, even when a large bearing having a weak correlation between the tightening torque and the tightening preload is used, the tightening preload is set to an appropriate value.
According to a fourth aspect of the present invention, the tightening preload measuring means is configured to rotate a rotating member by the rotating means and detect a rotating torque of the rotating member by a torque sensor.

With this configuration, the measurement of the tightening preload is performed from the rotational torque of the rotating member. The invention according to claim 5 includes means for detecting a tightening torque of the adjust nut, and means for recording and statistically processing tightening data including the detected tightening torque and the tightening preload. .

[0011] In this case, the tightening preload can be properly performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the attached drawings. FIG. 1 to FIG. 6 are diagrams showing an embodiment of the adjusting nut tightening and tightening preload measuring device of the present invention. In FIG. 1, in the adjusting nut of this embodiment, a hub as a rotating member of a front axle 20 of a vehicle is screw-fitted to an end of a knuckle as a shaft member supported by two inner and outer tapered roller bearings. And is tightened with a predetermined tightening force.

The tightening and tightening preload measuring device includes a device main body 23 supported by a moving means 22 that moves following positions of a plurality of front axles 20 as a work supported by an assembly conveyor 21 as a supporting portion. An electric nut runner 24 as tightening means for tightening the adjust nut, a rotating means 25 for rotating the hub,
Tightening preload measuring means 26 for measuring the tightening preload of the adjust nut.

In the present embodiment, the adjustment nuts are provided on the left and right sides of the front axle 20, and a pair of tightening and tightening preload measuring devices are provided on the left and right sides corresponding to the two adjustment nuts. In the following description, the configuration of one of the tightening and tightening preload measuring devices will be described.

The moving means 22 is shown in FIGS.
It is configured as shown in FIG. An I-beam 28 is fixedly mounted on the ceiling 27 above the assembly conveyor 21 as a pair of left and right traveling rails, which are disposed parallel and separated from each other and extend horizontally along the direction in which the assembly conveyor 21 extends. . Each I-beam 28 is equipped with a pair of left and right traveling devices 29 that travel along the I-beam 28.

The traveling device 29 includes a pair of guide rollers 30 rotatably mounted on the left and right upper surfaces of the lower end of the I-beam 28, and a position contacting the lower surface of the lower end of the I-beam 20, respectively. A drive roller 31 movably installed at a position moving downward from the lower surface and away from the lower surface, an air motor 32 for driving the drive roller 31 to rotate, and a drive roller 3
Air cylinder 33 for selectively operating 1 at the two positions
And is comprised.

The operation of the traveling device 29 is as follows. When the air-air cylinder 33 is raised, the driving roller 31 moves upward from the lower surface of the lower end of the I-beam 28 and moves from a position separated from the lower surface to a position contacting the lower surface. I do. Here, when the air motor 32 is rotationally driven, the driving roller 31 is rotated.
Rotates, thereby starting traveling. When traveling of the traveling device 29 to a predetermined position is detected by a limit switch (not shown), the air motor 32 is stopped, and the air / air cylinder 33 is moved down, so that the drive roller 31 is moved from the lower surface of the lower end of the I-beam 28. It moves downward and separates, and the drive roller 31 is in a free state.

The left and right traveling devices 29 having such a configuration are mutually connected by a connecting member 34 extending in a horizontal direction perpendicular to the direction in which the I-beam 28 extends. A support member 35 for suspending and supporting the apparatus main body 23 is connected to the connecting member 34. In this case, the connecting member 34
An upper end portion of the support member 35 is horizontally slidably supported in left and right directions, and a horizontal slide device 36 for sliding the support member 35 is provided. Further, the suspension member 3 on the apparatus body 23 side with respect to the support member 35
The upper end of the slide member 7 is vertically slidably supported in the upward and downward directions, and a vertical slide device 38 for sliding the hanging member 37 is provided.

Next, the configuration of the electric nut runner 24, the rotating means 25 and the tightening preload measuring means 26 will be described in detail with reference to FIG. An electric motor 39 for driving the nut runner 24 is fixedly supported on the upper part of the apparatus main body 23 formed in a frame shape. This electric motor 3
9 A cylindrical support member 40 is fixedly attached to the front end of the main body,
The support member 40 is penetrated and supported above the front plate 23 </ b> A of the apparatus main body 23. The rotation shaft 39A of the electric motor 39 penetrates the inside of the support member 40 and protrudes to the outside. An adjust nut socket 41 is attached to the tip of the rotating shaft 39A.

The components constitute the electric nut runner 24. On the other hand, on the outer peripheral portion of the support member 40, the preload pipe 4 is connected via a pair of bearings 42.
3 is rotatably supported. A preload socket base 44 is fixedly attached to the end of the preload pipe 43. A pair of socket holders 45 extending in the horizontal direction are respectively mounted at two opposing positions of the preload socket base 44. Preload sockets 46 are attached to the distal ends of the socket holders 45, respectively. The preload socket 46 can be inserted into the nut 11 of the front axle shown in FIG.

The rotation driving device of the preload socket 46 includes an AC servomotor 47 and the AC servomotor 4.
7 and a gear-type power transmission mechanism 48 for transmitting the rotational driving force to the preload pipe 43. The AC servomotor 47 is disposed below the apparatus main body 23 and is supported by a motor support 49. The rotating shaft 47A of the AC servomotor 47 is connected to the front plate 23A of the apparatus main body 23.
Is supported at the bottom of Also, the rotating shaft 47 of the motor 47
A drive gear 50 is attached to the tip of A. The drive gear 50 is connected to the preload pipe 4
3 meshes with a preload gear 51 as a driven gear attached to the outer periphery of the rear end. Accordingly, the rotational driving force of the AC servomotor 47 is transmitted to the preload pipe 43 via the drive gear 50 and the preload gear 51, and the preload pipe 43 is rotated, so that the preload sockets attached to the two socket holders 45 are rotated. 46 rotates around the adjust nut socket 41 of the nut runner 24.

By means of such components, the rotating means 25
Is configured. Further, a strain gauge 52 as a torque sensor for detecting the rotation torque of the hub of the front axle 20 is attached to the rear plate portion 23B of the apparatus main body 23.
Is configured. 1 and 3, reference numeral 53 denotes an operation box provided on the upper portion of the apparatus main body 23.

Next, a control structure of the tightening and tightening preload measuring device will be described. FIG. 7 is a block diagram showing a control structure. The right (RH) device and the left (L
The devices of H) have the same structure, and in each device, the distortion as a means for detecting the tightening torque of the adjust nut is provided in the nut tightening portion A of the device main body 23 provided with the nut runner 24. A signal is input to an encoder 54 as a means for detecting a gauge and a tightening angle, and a signal from the strain gauge and the encoder 54 is transmitted through an amplifier 55 and an A / D converter 56 to a CPU (central processing unit) of a computer built in the controller. Processing operation device) 57. The rotation means 25 of the apparatus main body 23 and the strain gauge 5
2 is input to the CPU 57 via the amplifier 58 and the A / D converter 59. Further, a signal from the means 60 for detecting the voltage generated by the ABS sensor is input to the CPU 57.

The ABS is a vehicle anti-lock system provided to prevent the front and rear wheels from being locked when the vehicle is suddenly braked and to ensure stable braking and steering stability during braking.
It is a brake system, and the ABS sensor is
A vehicle speed sensor used in this system. The vehicle speed sensor includes a rotor attached to a hub of a front axle (not shown) and rotating integrally with the hub, and a speed sensor unit.

From the CPU 57, the sequencer 63
The control signal is output to a data display device 64, a tightening data including a tightening torque and a rotation torque of the hub, and a device 65 for recording and statistically processing the ABS sensor generated voltage data. The signal from the sequencer 63 is
9. The emergency stop limit switch 68, the automatic model setting means 69, and the axle assembly conveyor control panel are respectively input. Further, a signal from the specification instruction device 70 for instructing the specification of the vehicle is input to the automatic model setting means 69 and the device 65, respectively.

Next, the operation of the above configuration will be described. FIG. 8 is a flowchart schematically showing the tightening of the adjusting nut and the measuring operation of the tightening preload. In step 1 (abbreviated as S1 in the figure, the same applies hereinafter),
The adjustment nut is primarily tightened by the nut runner 24. In Step 2, an operation of automatically returning the tightening of the adjust nut is performed. In step 3, AC
The servo motor 47 is driven, and the preload socket 46 inserted into the nut 11 on the front axle is rotationally moved around the adjustment nut socket 41 (for example,
At 30 rpm, the adjust nut is tightened in step 4 while the brake drum is being hammered in and rotated. In step 5, to perform preload measurement, the rotation of the brake drum is rotated at a low speed (for example,
5 rpm). In step 6, the adjustment nut is tightened by the nut runner 24 until the rotation torque of the hub reaches a predetermined value while detecting the rotation torque of the hub (preload measurement) and detecting the ABS sensor voltage.
In step 7, it is determined whether or not the tightening preload is appropriate based on the rotation torque of the hub. If the tightening preload is insufficient, the process returns to step 6 and the adjusting nut is tightened again. At this time, the tightening torque of the adjust nut, the voltage generated by the ABS sensor, and the data of the tightening preload are recorded and statistically processed.

FIG. 9 shows the strain gauge 54 for detecting the tightening torque of the adjust nut with respect to the tightening during the primary tightening, the tightening reversal, the additional tightening and the tightening preload measurement, and the rotation torque of the hub ( The change over time of the output signal (sensor voltage) from the strain gauge 52 for detecting (preload) is shown. That is, when there is an output from the strain gauge 54 that detects the tightening torque of the adjustment nut, it indicates that the nut runner 24 is operating, and when there is an output from the strain gauge 52 that performs preload measurement, , Indicating that the brake drum is rotating. Then, after the adjusting nut is tightened until the preload reaches the predetermined value PSE during the preload measurement, if the preload measurement value is within the predetermined range for a predetermined time (5 seconds in this embodiment), the tightening preload is stopped. We judge that it is appropriate.

FIGS. 10 to 12 are flowcharts for explaining the details of the control of the adjusting nut tightening and tightening preload measuring device. The nut tightening section A, the preload measuring section B, the sequencer 63, the controller and Each function is described in order in the data storage unit.
In step 11, a model is selected. Step 12
Then, an ON signal of the nut runner (hereinafter referred to as "N / R") 24 is output, and in step 13, the N / R 24 is rotated forward. In step 14, the indication of the primary tightening of the adjust nut and the determination of whether the primary tightening has been completed are made. In step 15, the N / R 24 OFF signal is output, and in step 16, the N / R 24 is stopped. In step 17, the N / R 24 reverse signal is output, and in step 18, the N / R 24 is reversed (residual torque removal). At step 19, the residual torque and the adjusting nut return angle are confirmed, and the routine proceeds to step 20, where the O / N of the N / R 24 is determined.
The FF signal is output, and the N / R 24 is stopped in step 21. In step 22, an ON signal of the servo motor 47 is output, and in step 23, the servo motor 47 is rotated at a high speed (for example, 30 rpm). In step 24, the N / R 24 ON signal is output, and in step 25, the N / R 24 is rotated forward. In step 26, the torque of the adjustment nut is determined. In step 27, the display of the tightening of the adjustment nut and the determination of whether the tightening is completed are made. In step 28,
The N / R 24 OFF signal is output, and at step 29, the N / R 24 is stopped. In step 30, a mode selection for the presence / absence of ABS is performed. If ABS is present, the flow advances to step 31 to output an ABS sensor voltage measurement signal. In step 32, the ABS sensor voltage is determined. The sensor voltage is stored.
In step 33, a preload measurement signal is output, and in step 34, the servo motor 47 rotates at a low speed (for example,
3 to 5 rpm). In step 35, N / R24
Is output, and in step 36, the N / R 24 is rotated forward. In step 37, it is determined whether or not the measured preload value has reached a predetermined value.
If K, the preload value is stored in the data memory, an N / R 24 OFF signal is output in step 38, and the N / R 24 is stopped in step 39.
At step 40, an OFF signal of the servomotor 47 is output, and at step 41, the servomotor 47 is stopped. In step 42, the N / R 24 and the servo motor 4
7 is output, and N / R24
Then, the servomotor 47 is reversed (removal of residual stress).
In step 44, the apparatus is retracted, and in step 45, the retracted end of the apparatus is confirmed. In step 46, a comprehensive judgment is made based on the ABS sensor voltage and the preload value stored in the data memory. If OK, the apparatus is returned to the original position in step 47, and the original position is confirmed in step 48. End the flow. If NG, step 4
NG is displayed at 9 and a buzzer sounds at step 50.
End the flow.

The processing of steps 35 to 39 corresponds to the tightening control means. According to such a configuration, the adjustment nut can be automatically tightened and the tightening preload can be measured while following the front axle shaft on the assembly line. Does not require skill. Therefore, troublesome and troublesome work is unnecessary, and the work time can be shortened.
The workability can be improved, and the measurement accuracy of the tightening preload can be improved.

Furthermore, since the tightening of the adjust nut is automatically performed by the nut runner, the heavy-straining work can be eliminated, and there is no variation in the tightening of each worker. In particular, when tightening the adjust nut, while measuring the tightening preload, the adjust nut is tightened until the tightening preload reaches a predetermined value.For example, the correlation between the tightening torque and the tightening preload is determined. Even if a weak large bearing is used, it is easy to set the tightening preload to an appropriate value, and the quality can be stabilized. Further, as a result of setting the tightening preload to an appropriate value, it is possible to prevent the occurrence of seizure of the bearing due to excessive preload of tightening and the occurrence of rattling or damage of the bearing due to insufficient preload of tightening.

In addition, primary tightening, additional tightening including brake drum break-in rotation, and tightening such that the preload reaches a predetermined value while performing preload measurement are performed. Therefore, the tightening preload can be properly performed.
Furthermore, since the fastening data is recorded and statistically processed, the fastening preload can be properly performed.

If the ABS sensor voltage is measured and recorded and statistically processed as in the above-described embodiment, the quality of the brake system, which is an important security component, can be confirmed, which is effective for improving the quality. It is a target. In the above-described embodiment, the example in which the present invention is applied to the adjust nut of the front axle has been described. However, the present invention can be similarly applied to the adjust nut of the rear axle. In this case, the configuration of the adjustment nut tightening portion of the front axle and the rear axle is basically different, but the tightening and the tightening preload measurement can be performed by the same device by replacing the adjustment nut socket.

In this case, the adjustment nut socket 41
If the following configuration is adopted, the adjustment nut tightening portions of the front axle and the rear axle can be commonly used. That is, in FIG. 13, the adjust nut socket 41 is provided with an inner socket portion 41A and an outer socket portion 41 which is slidably fitted around the outer periphery of the inner socket portion 41A.
B, a spring 41C mounted on the outer periphery of the inner socket 41A and constantly pressing and biasing the outer socket 41B forward, and a socket center mounted on the outer socket 41B and slidable with respect to the inner socket 41A. 41D.

Therefore, when tightening the adjust nut b of the front axle A, the adjust nut b can be fitted into the inner socket portion 41A by pushing the socket center 41D with the knuckle center a as shown in FIG. At the time of tightening the adjust nut c of B, as shown in FIG. 13B, the outer socket portion 41B moves forward by the elastic urging force of the spring 41C, and the adjust nut c can be fitted to the outer socket portion 41B.

The present invention is not limited to the axle of a vehicle, but may be applied to other work in which a rotating member is supported by a bearing on a shaft member, and an adjust nut is screw-fitted to an end of the shaft member. Can also be applied.

[0036]

As described above, according to the first aspect of the present invention, while following a work or the like on an assembly line,
Since the adjusting nut is automatically tightened while measuring the tightening preload until the tightening preload reaches a predetermined value, for example, the correlation between the tightening torque and the tightening preload is weak. Even if a bearing is used, it is easy to set the tightening preload to an appropriate value, and it is possible to improve the tightening and tightening preload measurement work and improve the tightening preload measuring accuracy.

According to the second aspect of the present invention, a step of recording tightening data including the tightening torque of the adjusting nut and the tightening preload and performing a statistical process is included, so that the tightening preload can be optimized. It can be performed more reliably. According to the invention of claim 3, while following the work or the like on the assembly line, while measuring the tightening preload,
The adjustment nut is automatically tightened until the tightening preload reaches the specified value.For example, even if a large bearing with a weak correlation between the tightening torque and the tightening preload is used, the tightening preload can be adjusted properly. It becomes easy to set the value, and the tightening and tightening preload measurement work can be improved, and the tightening preload measurement accuracy can be improved.

According to the fourth aspect of the present invention, the measurement of the tightening preload can be easily performed from the rotational torque of the rotating member. According to the fifth aspect of the present invention, since the means for recording and statistically processing the tightening data including the tightening torque and the tightening preload of the adjusting nut is provided, the optimization of the tightening preload is more reliably performed. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire embodiment of an adjusting nut tightening and tightening preload measuring apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view illustrating the configuration of the moving means of the embodiment.

3A and 3B are diagrams for explaining the configuration of the moving means of the embodiment, wherein FIG. 3A is a front view, FIG. 3B is a right side view, and FIG.

FIG. 4 is a front view illustrating the configuration of a traveling device in the moving means according to the first embodiment.

FIG. 5 is a side view thereof.

FIG. 6 is a front view showing the configuration of the nut runner of the embodiment.

FIG. 7 is a block diagram showing a control structure of the embodiment.

FIG. 8 is a flowchart schematically showing a tightening adjustment nut and a tightening preload measuring operation.

FIG. 9 is a characteristic diagram showing a change in sensor voltage with respect to tightening during primary tightening, retightening, additional tightening, and tightening preload measurement.

FIG. 10 is a flowchart showing in detail the adjustment nut tightening and tightening preload measurement work.

FIG. 11 is a flowchart showing the details of the adjustment nut tightening and tightening preload measurement work.

FIG. 12 is a flowchart showing in detail the adjustment nut tightening and tightening preload measurement work.

FIG. 13 is a diagram illustrating an application example of an adjust nut socket.

FIG. 14 illustrates a configuration of a front axle.

[Explanation of symbols]

 Reference Signs List 20 front axle 21 assembly conveyor 22 moving means 23 apparatus main body 24 nut runner 25 rotating means 26 preload measuring means

Claims (5)

[Claims] An adjusting nut is tightened to a work in which a rotating member is supported by a bearing with respect to a shaft member, and an adjusting nut is screwed to an end of the shaft member and tightened. And a method of measuring the tightening preload, wherein a step of automatically performing primary tightening of the adjust nut by a tightening means that moves following a plurality of work positions supported by the support portion; and Automatically returning the tightening of the adjusting member, and automatically performing the additional tightening of the adjust nut by the tightening means while rotating and rotating the rotating member by the rotating means moving following the plurality of workpiece positions. And measuring the tightening preload by the tightening preload measuring means that moves following the plurality of workpiece positions, and by the tightening means until the tightening preload reaches a predetermined value. Automatically tightening the adjust nut, and measuring the tightening of the adjust nut and the preload of the tightening nut. 2. The method according to claim 1, further comprising a step of detecting a tightening torque of the adjusting nut, and a step of recording and statistically processing tightening data including the detected tightening torque and tightening preload. 2. The method for measuring the tightening and tightening preload of an adjust nut according to claim 1, wherein: 3. A work in which a rotating member is supported by a bearing with respect to a shaft member, and an adjust nut is screwed to an end of the shaft member to tighten the adjust nut. And a device for measuring the tightening preload, comprising: a device main body supported by a moving means that moves following a plurality of work positions supported by a support portion; and Fastening means for performing fastening,
A rotating means provided in the apparatus main body, for rotating the rotating member, a tightening preload measuring means for measuring a tightening preload of the adjusting nut, and measuring the tightening preload until the tightening preload reaches a predetermined value. Tightening control means for tightening the adjustment nut by the tightening means,
An adjustment nut tightening and tightening preload measuring device, characterized by comprising: 4. An adjusting nut according to claim 3, wherein said tightening preload measuring means is configured to rotate a rotating member by said rotating means and detect a rotating torque of said rotating member by a torque sensor. Tightening and tightening preload measuring device. 5. A means for detecting a tightening torque of the adjust nut, and means for recording and statistically processing tightening data including the detected tightening torque and the tightening preload. The tightening and tightening preload measuring device for an adjust nut according to claim 3 or 4.