JP2003121289A - Elastic deformation amount measurement device of rod- like member, correction device and correction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly measure the elastic deformation amount of a rod-like member with a simple structure in rotating the rod-like member in an elastic deformation range. SOLUTION: In this measurement device, a shaft 14 is rotatably supported by a ball bearing 16 and a roller bearing 18. The measurement device is provided with: a holding mechanism 20 for blocking vibration or the like of the ball bearing 16 and the roller bearing 18; a driving mechanism 22 capable of rotating the shaft 14 at a rotational speed reaching an elastic deformation range; a connection mechanism 24 for connecting the shaft 14 to the driving mechanism 22 in a non-contact manner by using magnetism; and a displacement detection mechanism 26 disposed corresponding to a nearly central part in the axial direction of the shaft 14 for detecting the displacement of the shaft 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod-shaped member elastic deformation amount measuring device for measuring an amount of elastic deformation of a rod-shaped member when the rod-shaped member rotates in an elastic deformation region, and a rod-shaped member elastic deformation measuring device. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic deformation amount correcting device and method for a rod-shaped member for correcting balance.

[0002]

2. Description of the Related Art For example, in a gas turbine engine or the like,
A rod-shaped member such as a shaft or a tube that rotates at high speed is used. In the actual use, this rod-shaped member is preliminarily measured for imbalance during rotation so as not to cause imbalance during rotation, and work for correcting this imbalance is performed. .

For this type of correction work, for example, Japanese Patent Laid-Open No.
The "balance correction method for a high-speed flexible shaft coupling" disclosed in Japanese Patent Publication No. 00-337394 is used. In this conventional technique, a pair of left and right diaphragm units each having a flange attached to the small diameter portion of the side tube with one end having a small diameter portion and the other end having a large diameter portion through a diaphragm, and the large diameter portion of the side tube. In a balance correction method for a high-speed flexible shaft joint including a center tube provided between them, an eccentric amount of the center tube with respect to the diaphragm unit is measured, and an outer peripheral surface portion of the center tube is turned based on the measured value. It is characterized by correcting the rotation balance.

[0004]

By the way, in general,
The imbalance of the rod-shaped member, when the rod-shaped member is rotated at a low speed, or the imbalance of the rigidity region that exists when not rotating, and the imbalance of the elastic region that occurs when the rod-shaped member is rotated at a high speed. There is. However, in the above-mentioned conventional technique, the eccentricity between the center tube and the diaphragm unit, which is likely to occur by butt welding the center tube and the side tube so as to have the same center, is eccentric in the rigid region (deformation amount). To measure
The imbalance in the rigid region is corrected. Therefore, the above-mentioned conventional technique has a problem that it is not possible to correct the imbalance in the elastic range when the high-speed flexible shaft coupling is rotated at a high speed and used.

Further, as a drive mechanism for rotating the rod-shaped member, a system of driving a drive source such as a belt drive or a motor via a universal coupling is adopted.
However, in belt driving, unbalance due to the tension direction of the belt is likely to occur, whereas in coupling by the universal coupling, it is necessary to accurately adjust the unbalance of the coupling itself when setting the rod-shaped member.

As a result, particularly when the rod-shaped member is rotated at high speed up to the elastic range, the unbalanced state of the drive system itself is enlarged, and the elastic deformation amount of the rod-shaped member cannot be accurately measured. However, it has been pointed out that it is difficult to accurately correct the imbalance of the rod-shaped member.

The present invention solves this kind of problem. When the rod-shaped member is rotated in the elastic deformation region, the elastic deformation amount of the rod-shaped member can be accurately measured. An object is to provide a measuring device.

Further, the present invention provides an elastic deformation amount correcting device for a rod member, which is capable of accurately detecting the elastic deformation amount of the rod member and correcting the imbalance of the rod member with high accuracy and efficiency. The purpose is to provide a method.

[0009]

In the elastic deformation amount measuring device for a rod-shaped member according to the present invention, both ends of the rod-shaped member are rotatably supported by bearings, and the rod-shaped member is held from the outer ring side of the bearing by a holding mechanism. It is held with a predetermined pressing force via. In this state, the rod-shaped member is rotated at a rotation speed reaching the elastic deformation region of the rod-shaped member via a drive mechanism connected in a non-contact manner via a connecting mechanism utilizing magnetism. At that time, a displacement amount detection mechanism arranged corresponding to a substantially central portion in the axial direction of the rod-shaped member detects the distance from the peripheral surface of the rod-shaped member as the displacement amount of the rod-shaped member.

Therefore, when the rod-shaped member rotates at a high speed, which is an elastic deformation region of the rod-shaped member, vibrations and the like do not occur in the bearings supporting both ends of the rod-shaped member, and the rod-shaped member and The unbalance of the connecting mechanism itself for connecting the drive mechanism is not transmitted to the rod-shaped member. As a result, unbalance (vibration) of the bearing or the coupling mechanism is reliably prevented from affecting the rod-shaped member that rotates at a high speed, and the elastic deformation amount of the rod-shaped member can be measured with high accuracy.

Further, in the elastic deformation amount correcting device for a rod-shaped member according to the present invention, the deformation amount of the rod-shaped member is transmitted through the displacement amount detecting mechanism for each predetermined rotation angle pitch of the rod-shaped member under the action of the measuring mechanism. Detected. Then, the maximum displacement amount calculated from the displacement amount data of the rod-shaped member and the rotation angle of the maximum displacement amount, and the maximum displacement amount calculated from the displacement amount data when the provisional weight is attached to the rod-shaped member and rotated, Based on the rotation angle of the maximum displacement amount and the weight of the temporary weight, the weight of the weight and the mounting rotation angle for correcting the imbalance of the rod-shaped member are calculated. Therefore, the imbalance of the rod-shaped member rotated at a high speed in the elastic deformation region can be corrected with high accuracy and reliability.

Further, in the elastic deformation amount correcting method for a rod-shaped member according to the present invention, the distance from the peripheral surface of the rod-shaped member is set as the displacement amount of the rod-shaped member, corresponding to the substantially central portion in the axial direction of the rod-shaped member. A displacement amount detecting mechanism for detecting is arranged. Therefore, the first step of rotating the rod-shaped member at a speed lower than the rotation speed of the elastic deformation region to detect the displacement amount of the rod-shaped member at every predetermined rotation angle pitch, and the rod-shaped member to the elastic deformation region. And a second step of detecting the displacement amount of the rod-shaped member for each predetermined rotation angle pitch, and the displacement amount detected in the second step is detected in the first step. And a third step of obtaining the maximum displacement amount of the rod-shaped member and the rotation angle of the maximum displacement amount after subtracting the displacement amount.

As described above, in the first step, the rod-shaped member is rotated in its rigid region, and the machining roughness of the outer peripheral surface of the rod-shaped member is detected, while in the second step, the rod-shaped member is Is rotated in the elastic deformation region, and the elastic deformation amount of the rod-shaped member and the processing roughness are detected in a mixed manner.
Therefore, by subtracting the displacement amount detected in the first step from the displacement amount detected in the second step, processing noise (processing roughness) is removed from the elastic deformation amount of the rod-shaped member,
It is possible to accurately obtain the maximum displacement amount of the rod-shaped member and the rotation angle of the maximum displacement amount.

Next, a dummy weight is attached to the rod-shaped member, the rod-shaped member is rotated at a speed lower than the rotational speed of its elastic deformation region, and the displacement amount of the rod-shaped member is detected at every predetermined rotation angle pitch. And a fifth step of rotating the rod-shaped member to which the dummy weight is attached at a rotation speed in an elastic deformation region thereof to detect a displacement amount of the rod-shaped member for each predetermined rotation angle pitch, A sixth step of obtaining the maximum displacement amount of the rod-shaped member and the rotation angle of the maximum displacement amount after subtracting the displacement amount detected in the fourth step from the displacement amount detected in the fifth step. And have.

Thus, it becomes possible to reliably and easily remove the processing noise from the elastic deformation amount of the rod-shaped member to which the dummy weight is attached, and the maximum displacement amount and the maximum displacement amount of the rod-shaped member to which the dummy weight is attached. It is possible to accurately obtain the rotation angle of the maximum displacement amount. Therefore, based on the maximum displacement and rotation angle of the rod-shaped member obtained in the third step, the maximum displacement and rotation angle of the rod-shaped member obtained in the sixth step, and the weight of the dummy weight, The weight of the weight and the mounting rotation angle for correcting the imbalance of the rod-shaped member can be calculated with high accuracy and efficiency.

[0016]

1 is a schematic structural explanatory view of an elastic deformation amount correcting device 12 incorporating a rod-shaped member elastic deformation amount measuring device 10 according to an embodiment of the present invention.

The elastic deformation measuring device 10 has a ball bearing 16 and a roller bearing 18 at both ends of a shaft 14 which is a rod-shaped member.
And a holding mechanism 20 that rotatably supports the shaft 14 from the outer ring (to be described later) sides of the ball bearing 16 and the roller bearing 18 with a predetermined pressing force.
A drive mechanism 22 that can rotate the shaft 14 at a rotational speed that reaches an elastic deformation range; a connection mechanism 24 that connects the end of the shaft 14 and the drive mechanism 22 in a non-contact manner using magnetism; 14 axis direction (arrow X direction)
A displacement amount detection mechanism 26 is disposed corresponding to substantially the center and detects the distance from the peripheral surface of the shaft 14 as the displacement amount of the shaft 14.

The elastic deformation amount correcting device 12 includes the elastic deformation amount measuring device 10 and the shaft 1 through the displacement amount detecting mechanism 26 at every predetermined rotation angle pitch of the shaft 14.
4, a measuring mechanism 28 for detecting the amount of displacement, and the shaft 1
4, the correction data calculation mechanism 30 for calculating the weight and attachment angle of the weight for correcting the imbalance of the shaft 14 according to the procedure described later, and the holding mechanism 20 for supporting the shaft 14. The ball bearing 16 and the roller bearing 18 are provided with a lubricating oil supply mechanism 32 for supplying lubricating oil.

The holding mechanism 20 is provided on the base 34,
First and second holding portions 36 and 38 are provided corresponding to both end positions of the shaft 14. As shown in FIG.
A ball bearing 16 is mounted on the first holding portion 36, and an inner ring 16 a constituting the ball bearing 16 is externally mounted on one end 14 a of the shaft 14 and the ball bearing 16 is provided.
The outer ring 16 b is supported in the first holding portion 36.

A receiving cylinder 40 is externally mounted on one end 14a, and a nut 42 is screwed onto the one end 14a, so that the end of the receiving cylinder 40 is fixed to the inner ring 1.
6a is retained and supported. The outer ring 16b is retained and supported by a plate member 44 screwed to the first holding portion 36.

A space portion 46 is formed in the first holding portion 36 so as to correspond to the center side of the outer peripheral surface of the outer ring 16b, and the space portion 46 communicates with a supply port 50 through a passage 48. The first holding portion 36 has a nozzle 5 for injecting lubricating oil to the ball bearing 16 in order to prevent the ball bearing 16 from burning.
2 is mounted via the mounting plate 54.

As shown in FIG. 3, the other end 14b of the shaft 14 is covered with a tubular holder 56 via a nut 58, and the roller bearing is provided between the shaft 14 and the second holding portion 38. 18 is interposed. The inner ring 18 a that constitutes the roller bearing 18 is arranged on the outer peripheral portion of the shaft 14, and the inner ring 18 a is supported by the shaft 14 so as to prevent the inner ring 18 a from slipping off through a cylindrical holder 56. In the second holding portion 38,
In order to prevent seizure of the roller bearing 18, a nozzle 80 for injecting lubricating oil to the roller bearing 18 is provided with a mounting plate 82.
Placed through.

The outer ring 18b which constitutes the roller bearing 18 is supported by the second holding portion 38 via a plate material 66 so as to prevent the outer ring 18b from coming off, and the space portion 6 is provided at the center of the outer peripheral surface of the outer ring 18b.
8 are formed in a circle. The space 68 communicates with the supply port 72 via the passage 70.

The outer peripheral portion of the cylindrical holder 56 and the second holding portion 3
A labyrinth structure 74 for preventing oil leakage is formed between the inner peripheral surface of the oil tank 8 and the inner peripheral surface of the oil tank 8. Pressurized air is supplied to the labyrinth structure 74 from an air supply port 76 via an air passage 78.

The cylindrical holder 56 constitutes the coupling mechanism 24, and a disk plate (for example, oxygen-free copper) 84 which is an eddy current plate is provided at the large diameter side end of the cylindrical holder 56.
At a position facing the disk plate 84, a magnetic coupling 90 axially attached to a rotary drive shaft 88 extending in the horizontal direction from a servo motor 86 constituting the drive mechanism 22 is arranged. A magnet 94 is attached via a cover 96 to the front end surface side of a holder 92 that constitutes the magnetic coupling 90. The magnet 94 is arranged in a ring shape by alternately arranging N poles and S poles.

As shown in FIG. 1, the displacement amount detecting mechanism 26
Is the gap sensor 100 mounted on the base 34.
The gap sensor 100 is located at a substantially central portion in the axial direction of the shaft 14 and is arranged so as to face the peripheral surface of the shaft 14. The detection signal from the gap sensor 100 is sent to the measuring mechanism 28 and the measuring mechanism 2
A pulse signal is sent from the photoelectric sensor 102 to 8.

The photoelectric sensor 102 is arranged facing the outer peripheral surface of the cylindrical holder 56 corresponding to the other end 14b side of the shaft 14, while the mark portion is formed on the outer peripheral surface of the cylindrical holder 56. 104 is provided. This mark part 104
After making a groove in the axial direction for a specified length,
It is constructed by being colored black.

The photoelectric sensor 102 detects the mark portion 104 each time the shaft 14 makes one rotation, generates a reference signal of one pulse, and sends this reference signal to the measuring mechanism 28. The measuring mechanism 28 measures the rotation speed of the shaft 14 from this reference signal, sets a sampling interval for taking in data for each predetermined rotation angle pitch based on this rotation speed, and sets each sampling interval via the gap sensor 100. First, the displacement amount data of the shaft 14 is measured.

The correction data calculation mechanism 30 includes the shaft 14
Maximum displacement amount calculated from the displacement amount data and the rotation angle of the maximum displacement amount, and the maximum displacement amount and the maximum displacement amount calculated from the displacement amount data when the temporary weight is attached to the shaft 14 and rotated. Based on the rotation angle and the weight of the temporary weight, the weight of the weight and the mounting rotation angle for correcting the imbalance of the shaft 14 are calculated.
The measurement mechanism 28 and the correction data calculation mechanism 30 are configured as functions of a single PC, for example.

The lubricating oil supply mechanism 32 includes the oil pump 11
The oil supply line 112 which is provided with 0 and communicates with the discharge port of the oil pump 110 communicates with the supply ports 50 and 72 and the nozzles 52 and 80 of the first and second holding portions 36 and 38 which form the holding mechanism 20. .

An oil pan 114 is disposed below the holding mechanism 20 and extends in the longitudinal direction of the shaft 14 (direction of arrow X) to collect the lubricating oil. An oil drain line 116 communicates with the lower side of the oil pan 114, and the oil drain line 116 communicates with the inlet side of the oil pump 110.

The operation of the elastic deformation amount correcting device 12 incorporating the elastic deformation amount measuring device 10 thus constructed will be described with reference to FIG. 4 and FIG. 4 in connection with the elastic deformation amount correcting method according to the first embodiment of the present invention. A description will be given below based on the flowchart shown in FIG.

First, the shaft 14 is attached to the holding mechanism 20, and the shaft 14 is rotated at a high speed (rotation within the elastic deformation region of the shaft 14) under no load, and the shaft 1 is rotated.
The amount of elastic deformation of No. 4 is measured (step S1).

Specifically, as shown in FIG. 3, when the servo motor 86 constituting the drive mechanism 22 is driven and the magnetic coupling 90 connected to the rotary drive shaft 88 rotates, the magnet 94 and the disk plate are rotated. 84 and 84 rotate integrally via an eddy current, and the cylindrical holder 56 mounting the disk plate 84 rotates.

The cylindrical holder 56 is mounted on the other end 14b of the shaft 14, and the shaft 14 is rotated at a high speed (for example, 14,000 rpm) in its elastic deformation region. At that time, every time the photoelectric sensor 102 detects the mark portion 104 provided on the cylindrical holder 56,
That is, a reference signal of one pulse is generated each time the shaft 14 makes one rotation, and the reference signal is sent to the measuring mechanism 28. Therefore, in the measuring mechanism 28,
The rotation cycle T is measured (step S1 in FIG. 5).
1).

On the other hand, assuming that the resolution of the gap sensor 100 constituting the displacement amount detecting mechanism 26 is N (data / deg), the sampling rate S by this gap sensor 100 is calculated by S = 360 × N / T. (Step S12).

Next, in step S13, the displacement amount data of the shaft 14 (gap sensor data) is sampled by the gap sensor 100, and the sampled displacement amount data is averaged to the displacement amount data for each degree. (Step S14). And 0 degree
The displacement amount data of 360 degrees, that is, one rotation is stored (step 15).

Here, in FIG. 6, the measured rotation speed is 500 to
Displacement amount data indicating the relationship between the displacement amount of the shaft 14 and the rotation angle obtained by setting the sampling angle to 0.1 degree in the range of 20,000 (rpm) and the sampling number of 50 rotations is shown. There is.

In this case, in the elastic deformation amount measuring apparatus 10 according to this embodiment, both end portions 14a, 1 of the shaft 14 are
The ball bearing 16 and the roller bearing 18 that support 4b are held by the first and second holding portions 36 and 38 that form the holding mechanism 20 via hydraulic pressure.

Specifically, as shown in FIGS. 2 and 3, the lubricating oil supply mechanism 32 to the first and second holding portions 3 are connected to each other.
Lubricating oil is introduced into the supply ports 50 and 72 of the valves 6 and 38 at a predetermined pressure. This lubricating oil is introduced into the spaces 46 and 68 through the passages 48 and 70, so that the outer rings 16b and 18b forming the ball bearing 16 and the roller bearing 18 are held with a predetermined pressing force toward the center side. To be done.

As a result, when the shaft 14 rotates at a high speed (for example, 14,000 rpm), the ball bearing 16
And unbalance (vibration) does not occur in the roller bearing 18 and the unbalance (vibration) of the ball bearing 16 and the roller bearing 18 and reliably prevents the shaft 14 rotating at high speed from being affected. You can

Moreover, the drive mechanism 22 and the shaft 14 are magnetically connected in a non-contact manner via the connecting mechanism 24, and the vibration due to the imbalance of the drive mechanism 22 itself is transmitted to the shaft 14 rotating at a high speed. Never. Therefore, in the present embodiment, it is possible to obtain an effect that the deformation behavior of the shaft 14 itself can be accurately measured.

Further, the ball bearing 16 and the roller bearing 18 are supplied with lubricating oil from the nozzles 52 and 80, respectively, and when the shaft 14 rotates at a high speed, the ball bearing 1
6 and the roller bearing 18 can be reliably prevented from causing seizure or the like. The first and second
The lubricating oil supplied to the holding portions 36, 38 and the nozzles 52, 80 is, as shown in FIG. 1, collected in an oil pan 114 and then returned to the oil pump 110 from the oil drain line 116, and again, It is sent to the refueling line 112.

By the way, after the displacement amount data of the shaft 14 is measured without a load as described above (see FIG. 7),
As shown in, the temporary weight 120 is attached to the shaft 14 at an arbitrary rotation angle position. Then, the displacement amount data measurement process is performed on the shaft 14 to which the temporary weight 120 is attached, similarly to the shaft 14 in the unloaded state (step S2 in FIG. 4).

Then, in step S3, the correction data calculation mechanism 30 attaches the dummy weight 120 and the maximum displacement amount calculated from the displacement amount data of the unloaded shaft 14 and the rotation angle of the maximum displacement amount. A weight for correcting the imbalance of the shaft 14 based on the maximum displacement amount calculated from the displacement amount data of the shaft 14, the rotation angle of the maximum displacement amount, and the weight of the temporary weight 120 (correction The weight of the weight 122 and the mounting angle position are calculated.

A weight 122 is attached to the shaft 14 based on the calculation result (see FIG. 9). Further, if necessary, the shaft 14 to which the weight 122 is attached is attached.
However, in order to confirm whether or not the elastic deformation region rotates within a desired elastic deformation amount range at high speed rotation, a process of measuring displacement amount data of the shaft 14 is performed in the same manner as above (step S4). .

As a result, in the elastic deformation amount correcting device 12 according to the present embodiment, the influence of the imbalance (vibration) of the elastic deformation amount correcting device 12 itself is prevented, and the shaft 14
It is possible to accurately measure the amount of deformation of the shaft under high speed rotation, and it is possible to obtain the effect that the elastic deformation amount correction process of the shaft 14 is performed with high accuracy and efficiency.

An elastic deformation amount correcting method according to the second embodiment of the present invention will be described below with reference to the flowchart shown in FIG.

First, the unloaded shaft 14 is rotated at a low speed (for example, 1,000 rpm), and the shaft 1
The deformation amount data of No. 4 is measured (step S21). At this low speed, the shaft 14 is rotating in the rigid region,
The displacement amount data obtained from the displacement amount detection mechanism 26 is the processing roughness of the shaft 14. Then, this displacement amount data (low rotation data) is measured over a range of 0 degrees to 360 degrees, as shown in FIG.

Further, the unloaded shaft 14 is rotated at a high rotation (14,000 rpm) which is an elastic deformation region,
The displacement amount data of the shaft 14 is measured (step S22). As shown in FIG. 11, the deformation amount data (high rotation data) in this elastic deformation region is data including processing roughness, and the process proceeds to step S23, where the low rotation is calculated from the displacement amount data at this high rotation. After obtaining the difference data A by subtracting the displacement amount data in, the maximum amplitude (maximum displacement amount) and its phase data are obtained based on this difference data A.

Next, after a temporary weight (not shown) is attached to the shaft 14 and similarly low displacement (1,000 rpm) displacement amount data is measured (step S24), high revolution (14,000 rpm). ), The displacement amount data is measured (step S25). Then, after the low rotation data is divided from the high rotation data to obtain the difference data B (step S
26), based on the difference data A and the difference data B, the weight of the correction weight 122 and the attachment rotation angle are obtained (step S27).

Further, if necessary, based on the displacement amount data at low rotation and the displacement amount data at high rotation of the shaft 14 to which the correction weight 122 is attached, the weight of the correction weight and the attachment rotation angle are calculated. Confirmation is performed (step S
28-S30).

As described above, in the second embodiment, machining noise (machining roughness) is removed when the unloaded shaft 14 and the shaft 14 to which the dummy weight 120 is attached rotate in the elastic deformation region. An accurate elastic deformation amount can be obtained. As a result, the weight of the weight and the mounting rotation angle for correcting the imbalance of the shaft 14 can be calculated with high accuracy and efficiency.

[0054]

In the elastic deformation amount measuring device for a rod-shaped member according to the present invention, when the rod-shaped member rotates in its elastic deformation range,
The unbalance of the bearing or the drive mechanism that supports the rod-shaped member is not transmitted to the rod-shaped member, and the elastic deformation amount of the rod-shaped member can be measured with high accuracy.

Further, in the elastic deformation amount correction device for a rod-shaped member according to the present invention, the deformation amount of the rod-shaped member in the elastic deformation region is accurately calculated, and the unbalance of the rod-shaped member rotated at a high speed in the elastic deformation region is calculated. Can be corrected with high accuracy and certainty.

Furthermore, in the elastic deformation amount correction method for a rod-shaped member according to the present invention, the processing noise can be removed from the elastic deformation data of the rod-shaped member rotating in the elastic deformation region.
It becomes possible to calculate the elastic deformation amount of the rod-shaped member with high accuracy and efficiency, and to accurately calculate the weight of the weight and the mounting rotation angle for correcting the imbalance of the rod-shaped member.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory diagram of an elastic deformation amount correction device incorporating an elastic deformation amount measurement device for a rod-shaped member according to an embodiment of the present invention.

FIG. 2 is a cross-sectional explanatory view of a first holding portion of a holding mechanism that constitutes the elastic deformation amount measuring device.

FIG. 3 is a cross-sectional explanatory view of a second holding portion of the holding mechanism.

FIG. 4 is a flowchart illustrating an elastic deformation amount correction method according to the first embodiment of the present invention.

FIG. 5 is a flowchart of a process of measuring the amount of elastic deformation of the shaft.

FIG. 6 is an explanatory diagram of deformation amount data of the shaft.

FIG. 7 is an explanatory diagram when the shaft rotates with no load.

FIG. 8 is an explanatory diagram when the shaft rotates with a dummy weight attached.

FIG. 9 is an explanatory diagram showing a state in which a weight is attached to the shaft.

FIG. 10 is a flowchart illustrating an elastic deformation amount correction method according to a second embodiment of the present invention.

FIG. 11 is an explanatory diagram of low rotation data, high rotation data, and difference data.

[Description of Reference Signs] 10 ... Elastic deformation amount measuring device 12 ... Elastic deformation amount correcting device 14 ... Shaft 16 ... Ball bearings 16a, 18a ... Inner rings 16b, 18b ...
Outer ring 18 ... Roller bearing 20 ... Holding mechanism 22 ... Drive mechanism 24 ... Connection mechanism 26 ... Displacement amount detection mechanism 28 ... Measurement mechanism 30 ... Correction data calculation mechanism 32 ... Lubricating oil supply mechanism 36, 38 ... Holding portion 46, 68 ... Space Parts 52, 80 ... Nozzle 56 ... Cylindrical holder 74 ... Labyrinth structure 84 ... Disk plate 86 ... Servo motor 90 ... Magnetic coupling 94 ... Magnet 100 ... Gap sensor 102 ... Photoelectric sensor 104 ... Mark portion 110 ... Oil pump

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tokio Kikuchi             1-10-1 Shinsayama, Sayama City, Saitama Prefecture             Engineering Co., Ltd. (72) Inventor Tetsuhiro Takehara             1-10-1 Shinsayama, Sayama City, Saitama Prefecture             Engineering Co., Ltd. (72) Inventor Yo Wakamatsu             1-10-1 Shinsayama, Sayama City, Saitama Prefecture             Engineering Co., Ltd. F term (reference) 2F069 AA06 AA99 CC10 GG04 GG11                       HH09 MM02 MM34 NN09                 2G021 AB06 AF12 AM08

Claims (3)

[Claims] 1. An elastic deformation amount measuring device for a rod-shaped member for measuring an amount of elastic deformation of the rod-shaped member when the rod-shaped member rotates in an elastic deformation region, wherein both ends of the rod-shaped member are rotated by bearings. A holding mechanism that supports the rod-shaped member with a predetermined pressing force from the outer ring side of the bearing, a drive mechanism that can rotate the rod-shaped member at a rotational speed that reaches the elastic deformation region, and the rod-shaped member. A connecting mechanism that connects the end portion of the member and the drive mechanism in a non-contact manner by using magnetism, and a distance between the rod mechanism and the peripheral surface of the rod member, which is arranged corresponding to the substantially central portion in the axial direction of the rod member. A displacement amount detection mechanism for detecting as a displacement amount of the rod-shaped member, and an elastic deformation amount measurement device for the rod-shaped member. 2. An elastic deformation amount correction device for a rod-shaped member for measuring an amount of elastic deformation of the rod-shaped member when the rod-shaped member rotates in an elastic deformation region and correcting an imbalance of the rod-shaped member. A holding mechanism that rotatably supports both ends of the rod-shaped member and holds the rod-shaped member from the outer ring side of the bearing with a predetermined pressing force; and a rotation speed of the rod-shaped member that reaches the elastic deformation region. And a connecting mechanism that connects the end of the rod-shaped member and the drive mechanism to each other in a non-contact manner using magnetism, and is arranged corresponding to a substantially central portion in the axial direction of the rod-shaped member. A displacement amount detection mechanism that detects a distance from the peripheral surface of the rod-shaped member as a displacement amount of the rod-shaped member, and a predetermined rotation angle pitch of the rod-shaped member for each predetermined rotation angle pitch of the rod-shaped member via the displacement amount detection mechanism. Measurement to detect displacement Structure, the maximum displacement amount calculated from the displacement amount data of the rod-shaped member and the rotation angle of the maximum displacement amount, and the maximum displacement calculated from the displacement amount data when the provisional weight is attached to the rod-shaped member and rotated. A correction data calculation mechanism for calculating the weight of the weight and the attachment rotation angle for correcting the imbalance of the rod-shaped member based on the rotation amount and the rotation angle of the maximum displacement amount, and the weight of the temporary weight. An elastic deformation amount correcting device for a rod-shaped member, characterized in that. 3. A method for correcting an elastic deformation amount of a rod-shaped member for measuring an amount of elastic deformation of the rod-shaped member when the rod-shaped member rotates in an elastic deformation region and correcting an imbalance of the rod-shaped member. A displacement amount detection mechanism that detects a distance from the peripheral surface of the rod-shaped member as a displacement amount of the rod-shaped member is disposed at a position substantially corresponding to a central portion in the axial direction of the rod-shaped member. A first step of rotating at a rotational speed lower than the rotational speed of the deformation region, and detecting a displacement amount of the rod-shaped member for each predetermined rotation angle pitch; and rotating the rod-shaped member at a rotational speed of the elastic deformation region,
A second step of detecting the displacement amount of the rod-shaped member for each predetermined rotation angle pitch, and the displacement amount detected in the first step is subtracted from the displacement amount detected in the second step. After that, a third step of obtaining a maximum displacement amount of the rod-shaped member and a rotation angle of the maximum displacement amount, and a provisional weight is attached to the rod-shaped member so that the rod-shaped member is rotated at a speed lower than the rotation speed of the elastic deformation region. A fourth method of rotating and detecting the displacement amount of the rod-shaped member at each predetermined rotation angle pitch.
And a fifth step of rotating the rod-shaped member to which the dummy weight is attached at a rotation speed in the elastic deformation region to detect a displacement amount of the rod-shaped member for each predetermined rotation angle pitch, A sixth step of obtaining the maximum displacement amount of the rod-shaped member and the rotation angle of the maximum displacement amount after subtracting the displacement amount detected in the fourth step from the displacement amount detected in the fifth step. A maximum displacement amount and a rotation angle of the rod-shaped member obtained in the third step, a maximum displacement amount and a rotation angle of the rod-shaped member obtained in the sixth step, and a weight of the dummy weight. And a seventh step of calculating the weight of the weight and the attachment rotation angle for correcting the imbalance of the rod-shaped member based on the above.