JP2009270913A - Bearing clearance measurement device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and accurately measure the clearance of a bearing by a measurement load adapting to the bearing, and to measure a radial clearance and an axial clearance with the same device. <P>SOLUTION: This bearing clearance measurement device measures the clearance of the bearing 3 having an inner ring 1 and an outer ring 2. The bearing clearance measurement device includes: a support body 12 having a support surface 11 for fixing the bearing; a pair of holding members 14 that extend perpendicularly from the support surface, can move symmetrically along the support surface, and can hold the side surface of the inner ring 1 or outer ring 2 in parallel to the support surface; a load charging device 16 for charging the load F of the measurement direction on the outer ring 2 or inner ring 1; a load cell 18 for detecting the load; a displacement sensor 20 for detecting the displacement of the measurement direction of the outer ring 2; a synchronous data detector 22 for synchronously taking the detected data of the load cell and displacement sensor; and a clearance arithmetic device 22 for calculating the clearance in the measurement direction, based on the displacement when the load reaches a predetermined definition load. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bearing gap measuring device for use in a jet engine or the like.

For large jet engines, for example, ball bearings (for example, deep groove ball bearings and angular ball bearings) and cylindrical roller bearings are frequently used to support high-speed rotation (for example, 5000 to 8000 rpm) of a fan or propeller reaching a diameter of 3 m. .
Since these bearings are subjected to a large load (for example, 300 to 400 kgf) (radial load or thrust load) at the above-described high speed rotation, the rolling wheels (inner and outer rings) are regularly used to improve safety. It is necessary to measure the clearance (radial clearance and axial clearance) between the rolling elements (balls and cylindrical rollers).
FIG. 4 is an explanatory view of the radial clearance measurement and the axial clearance measurement of the bearing. As shown in FIG. 4A, the inner ring (or outer ring) is fixed, a load is applied to the outer ring (or inner ring) in the radial direction, and the amount of movement in the radial direction at that time is called a radial gap. Further, as shown in FIG. 4B, the outer ring (or inner ring) is fixed, a load is applied to the inner ring (or outer ring) in the axial direction, and the amount of movement in the axial direction that occurs at that time is called an axial gap.

FIG. 5 is a conceptual diagram of a radial gap (radial clearance) and shows an example of vertical installation.
As shown in FIG. 5A, the inner ring is fixed to a vertical surface, and the position of the upper end surface of the outer ring is measured in this state. Next, as shown in FIG. 5B, a load is applied to the lower end surface of the outer ring from the radial direction, and the position of the upper end surface of the outer ring is measured in this state. The difference between the measured values in FIGS. 5A and 5B corresponds to the radial clearance. Measurement is performed on the upper end surface of the outer ring.

FIG. 6 is a conceptual diagram of an axial gap (axial clearance).
As shown in FIG. 6A, the outer ring is fixed to a horizontal surface, and the position of the upper end surface of the inner ring is measured with the inner ring lowered downward. In this example, a is downward from the upper surface of the outer ring. Next, as shown in FIG. 6B, a load is applied to the lower end surface of the inner ring from the axial direction, and the position of the upper end surface of the inner ring is measured in this state. In this example, b is upward from the upper surface of the outer ring. The axial clearance corresponds to the sum of a and b.

A method for measuring the radial clearance of the bearing is defined in, for example, JIS (B-1515).
Further, bearing gap measuring devices are already commercially available (for example, Non-Patent Document 1).
In the radial clearance measurement method according to JIS, an inner ring or an outer ring is fixed, and a predetermined measurement load is alternately applied from both sides in the radial direction to an unfixed raceway ring. For the radial clearance, apply a measuring element in the radial direction to the center of the width of the non-fixed raceway, and subtract the elastic approach amount between the rolling element and the rolling ring due to the measured load from the arithmetic average value of the raceway motion. It is calculated as a quantity.

The radial clearance measuring device of Non-Patent Document 1 is a device that measures a radial clearance between an inner ring and an outer ring of a bearing. During the measurement, this apparatus supports the inner ring in a swingable or rotatable manner with the central axis being horizontal, pushes the outer ring up and down alternately, and measures the amount of displacement.
The thrust clearance measuring device of Non-Patent Document 1 is a device that measures an axial clearance between an inner ring and an outer ring of a bearing. During the measurement, this apparatus supports the inner ring in a swingable or rotatable manner with the central axis being vertical, pushes the outer ring up and down alternately, and measures the amount of displacement.

“MGL35-7 / 22-7 / 37-7 / 24-7, Radial Clearance Measuring Instruments” and “MGL75-7 / 77-7 / 78-7, Axial Clearance Measuring Instruments”, catalog of FAG

  The present invention is subject to clearance measurement of a wide variety of bearings in the maintenance of large jet engines and the like, and the bearings to be measured are already used bearings. Therefore, when the above-described conventional clearance measuring device is used. There were the following problems.

(1) In a conventional apparatus, a predetermined load (hereinafter referred to as a measurement load) is applied by air pressure or hydraulic pressure. However, when a wide variety of bearings are used, the measurement load is also various, and it is very difficult to set this accurately with pneumatic or hydraulic pressure settings, and it takes too much time and effort to adjust the pressure. .
(2) A bearing that measures a clearance during maintenance of a jet engine or the like is a bearing that is being used, and a sliding portion may be slightly locally worn. Since the conventional apparatus is intended for a new bearing, it is not possible to measure such a slight gap between the locally worn bearings.
(3) In the conventional apparatus, the inner ring is fixed with a dummy shaft, but the inner ring may be deformed in a bearing in use. Therefore, the dummy shaft may not be used. Even if it can be used, if the dummy shaft is forcibly inserted, the inner ring may be deformed and the accurate gap may not be measured accurately.
(4) Even if a dummy shaft can be used, a wide variety of dummy shafts are required because a wide variety of bearings are targeted.
(5) The conventional apparatus is a separate apparatus for radial and axial use, and cannot measure both with the same apparatus.

The present invention has been made to solve the various problems described above.
That is, the object of the present invention is to easily and accurately set the bearing gap by a measurement load suitable for each bearing for a wide variety of in-use bearings used for bearing clearance measurement for maintenance of large jet engines and the like. Even if the sliding part is locally worn, the gap due to local wear can be measured, and even when the inner ring is deformed, a wide variety of dummy shafts are unnecessary and the same device can be used. An object of the present invention is to provide a bearing gap measuring device capable of measuring a radial gap and an axial gap.

According to the present invention, a bearing gap measuring device for measuring a gap between bearings having an inner ring and an outer ring,
A support body having a support surface for fixing the bearing;
A holding member supported by the support body, extending vertically from the support surface, and capable of holding a side surface of the outer ring or the inner ring parallel to the support surface;
A load addition device that is supported by the support body and adds a load in the measurement direction to the outer ring or the inner ring;
A load cell installed between the load adding device and the outer ring or the inner ring for detecting the load;
A displacement sensor that is supported by the support body and detects a displacement amount of the outer ring or the inner ring in the measurement direction;
A synchronous data detector for synchronously capturing detection data of the load cell and the displacement sensor;
A bearing clearance measuring device is provided, comprising: a clearance calculating device that calculates a clearance in the measurement direction from the amount of displacement when the load reaches a predetermined specified load.

  According to a preferred embodiment of the present invention, the measurement direction is a radial direction or an axial direction of the bearing.

  The support body is configured to be able to roll the support surface horizontally or vertically.

  The holding member includes a pair of support bars penetrating the inner side of the inner ring or the outer side of the outer ring and extending vertically from the support body to above the support surface and being movable symmetrically along the support surface; And a clamp that supports one side of the inner ring or the outer ring and a clamp that is movably provided on the outer periphery of the support rod and holds the inner ring or the outer ring between the clamps.

  The load adding device includes a female screw member that is supported by the support body and has a female screw hole in the measurement direction of the outer ring, and a male screw member that is screwed into the female screw hole and extends in the measurement direction.

The synchronization data detector is a signal control board that receives the detection data of the load cell and the displacement sensor, outputs an error when the signals are not synchronized, and outputs only the synchronization signal.
The load adding device is a lever push-up type axial clearance load adding device.

According to the configuration of the present invention, since the holding member is supported by the support body, extends vertically from the support surface, and can hold the side surface of the inner ring or the outer ring in parallel with the support surface, the inner ring or the outer ring of the bearing is provided. The side surface can be held parallel to the support surface.
In particular, the holding member includes a pair of support rods, and by moving the pair of support rods symmetrically along the support surface, a wide variety of in-use bearings can be targeted and the inner ring is deformed. Even if it is possible to measure, a wide variety of dummy shafts are unnecessary.

In addition, since a load addition device that adds a load in the measurement direction to the outer ring or inner ring is provided, the load can be gradually increased by this device, and a wide variety of in-use bearings can be measured. A load can be added.
In addition, since this apparatus can temporarily stop and increase the speed of the outer ring or the inner ring while increasing the load, the gap due to local wear can be measured even when the sliding part is locally worn.
This is because by rotating the outer ring or the inner ring while applying a load, the ball can be allowed to escape (accelerate) to a locally worn portion of the outer ring inner ring.

  In addition, a synchronization data detector that synchronously captures the detection data of the load cell and the displacement sensor is provided, and a clearance in the measurement direction is calculated from the displacement when the load reaches a predetermined specified load by a clearance calculation device. Therefore, it is possible to easily and accurately measure the bearing gap by a predetermined measurement load suitable for each bearing.

  According to a preferred embodiment of the present invention, the measurement direction is a radial direction or an axial direction of the bearing, and the support body is configured to be able to roll the support surface horizontally or vertically. Can measure radial gap and axial gap.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 is a diagram showing a first embodiment of a bearing gap measuring device according to the present invention.
The bearing gap measuring device 10 of the present invention is a bearing gap measuring device that measures a gap between a bearing 3 having an inner ring 1 and an outer ring 2, and this example is a device that measures a radial gap.
In this figure, the bearing 3 is a cylindrical roller bearing.

  In this figure, a bearing gap measuring device 10 of the present invention includes a support body 12, a pair of holding members 14, a load adding device 16, a load cell 18, a displacement sensor 20, a synchronous data detector 22, and a gap calculating device 24. Prepare.

The support body 12 has a support surface 11 for fixing the bearing 3. In this example, the support body 12 is configured to be able to roll the support surface 11 horizontally or vertically. The support body 12 is, for example, a tilting circular table.
The support body 12 is not limited to the tilting / circular table, and may be another device. The support surface 11 is preferably a flat surface in the range from the minimum diameter to the maximum diameter of the target bearing.

  The holding member 14 is supported by the support body 12, extends vertically from the support surface 11, and is configured to be able to hold the side surface (lower surface in the drawing) of the bearing 3 parallel to the support surface 11.

In this example, the holding member 14 includes a pair of support bars 14a, a hook metal 14b, and a holding metal 14c.
The pair of support rods 14 a penetrate the inside of the inner ring 1 and extend vertically from the support body 12 to above the support surface 11, and are attached to the support surface 11 by a ball screw type support rod moving device 13 built in the support body 12. It is comprised so that it can move symmetrically with respect to the central axis Z of the bearing 3 along. The pair of support rods 14a can pass inside the inner ring of the bearing with the smallest inner diameter to be measured, can be expanded to the inside of the inner ring of the bearing with the largest inner diameter, and can also hold the outside of the outer ring.
The ball screw type support bar moving device 13 may be electric or manual.
The metal fitting 14b is fixed to the outer periphery of the support rod 14a, and supports one side surface (the lower surface in the drawing) of the inner ring 1 or the outer ring.
The clamping metal member 14c is provided on the outer periphery of the support rod 14a so as to be movable in the axial direction, and holds the inner ring 1 so as not to move by clamping the inner ring 1 with the metal fitting 14b by a lock mechanism (not shown). It has become.

The load adding device 16 is supported by the support body 12 and has a function of adding a load F in the measurement direction (radial direction in this example) to the outer ring 2.
In this example, the load application device 16 includes a female screw member 16a and a male screw member 16b.
The female screw member 16a is supported by the support body 12, and has a female screw hole in the measurement direction of the outer ring 2 (in this example, the radial direction).
The male screw member 16b is screwed into the female screw hole of the female screw member 16a and extends in the measurement direction.

With this configuration, the male screw member 16b is driven to rotate about its axis, and is screwed in the measurement direction of the outer ring 2 (radial direction in this example) to load the outer ring 2 in the measurement direction (radial direction in this example). F can be added by gradually increasing it.
The rotation driving of the male screw member 16b may be manual or electric. The present invention is not limited to this configuration, and may be an apparatus using hydraulic pressure or pneumatic pressure as long as the load F can be gradually increased and can be stopped at any time during the increase of the load.

The load cell 18 is installed between the load adding device 16 (in this example, the tip of the male screw member 16b) and the outer ring 2, and has a function of detecting the load F acting on the outer ring 2. The detected load F is communicated to the synchronous data detector 22 as an electric signal 4 (voltage, current, or pulse signal).
A load cell 18 that can detect a measurement load suitable for the bearing 3 with high accuracy is used. Further, the contact surface of the load cell 18 with the outer ring 2 is configured to have a shape (for example, a flat surface or an arc surface) in which the load F is reliably transmitted in the measurement direction of the outer ring 2.

  The displacement amount sensor 20 is, for example, a micrometer, a magnescale or the like, is supported by the support body 12 and detects a displacement amount δ in the measurement direction (in this example, the radial direction) of the outer ring 2. The detected displacement δ is communicated to the synchronous data detector 22 as an electrical signal 5 (voltage, current, or pulse signal).

The synchronous data detector 22 has a function of capturing the detection data 4 and 5 of the load cell 18 and the displacement amount sensor 20 in synchronization.
In this example, the synchronization data detector 22 receives the detection data 4 and 5 of the load cell 18 and the displacement sensor 20, respectively, outputs errors other than the synchronization signals that are not received at the same time, and outputs only the synchronization signals to the gap calculation device 24, respectively. It is the signal control board comprised so that.

The bearing gap measuring device 10 calculates the gap between the electric signal 5 of the length sent from the linear scale (displacement amount sensor 20) and the electric signal 4 of the force sent from the load cell 18 via a special board (synchronous data detector 22). It is sent to the measurement software of the device 24 (PC).
The gap measurement is a measurement that measures the amount of movement when the bearing is pressed with a specified force. If both signal transmission speeds are different, the length (displacement) when pressed with the specified force is calculated. Does not hold.

FIG. 7 is a schematic diagram showing a mechanism of signal synchronization. FIG. 7A shows an example in which signals are synchronized, and FIG. 7B shows an example in which signals are not synchronized.
In this example, when the bearing gap is pushed at the standard value of 15 kg, the gap is 0.3 mm.
The force to push the bearing is set in advance with the measurement software on the PC. The measurement software picks up the electric signal of the length when the force electric signal is 15 kg, but only when the signal is synchronized.

The boat 22 has a function of sending an error signal to the PC measurement software except when the electrical signal 5 of length and the electrical signal 4 of force are sent in synchronization.
In FIG. 7A, the signals are synchronized, and the board 22 sends the signals at this time to the PC 24 as measured values.
In FIG. 7B, there is no electrical signal having a length when the electrical signal has a force of 15 kg. That is, since there is no other party, the board 22 does not send the signal at this time to the PC 24 as a measured value.
In handling the measuring instrument, the speed at which the operator turns the screw that pushes the load cell is adjusted so as to achieve a “good speed” that synchronizes the force signal.

  The gap calculation device 24 is, for example, a PC (computer), and calculates a gap in the measurement direction (radial direction in this example) from the displacement δ when the load F reaches a predetermined specified load.

FIG. 2 is a diagram showing another embodiment of the bearing gap measuring device of FIG. This figure shows a state where the support surface 11 is vertically rolled by the support body 12 (tilting / circular table) described above.
Other configurations are the same as those in FIG.
With this configuration, when the bearing 3 is a deep groove ball bearing or an angular ball bearing, the stop outer ring 2 can be rotated and adjusted once while the load F is increased, so that the sliding portion is slightly worn locally. The gap due to local wear can be easily measured even when

FIG. 3 is a diagram showing a second embodiment of the bearing gap measuring device according to the present invention.
The bearing gap measuring device 10 of the present invention is a bearing gap measuring device that measures a gap between a bearing 3 having an inner ring 1 and an outer ring 2, and this example is an apparatus that measures an axial gap.

In this example, the load addition device 16 has a lever push-up type axial clearance load addition device 25.
The lever 25a of this device is supported by the support body 12, and is placed directly under the center of the push-up plate 17 with the inner ring 1 sandwiched therebetween.

  With this configuration, the lever 25a is pushed down, the load adding device 25 pushes up the push-up plate 17, and the axial load F is applied to the inner ring 1. Even if the sliding portion is locally worn, the lever can be stopped once and the inner ring can be rotated.

  In this example, the displacement amount sensor 20 is supported by the support body 12 via the displacement sensor fixing jig 20a for the axial direction, and detects the displacement amount δ in the measurement direction of the inner ring 1 (in this example, the axial direction). It is supposed to do.

According to the configuration of the present invention described above, the holding member 14 that is supported by the support body 12, extends vertically from the support surface 11, and can hold the side surface of the inner ring 1 or the outer ring 2 parallel to the support surface 11 is provided. The side surface of the inner ring 1 or the outer ring 2 of the bearing can be held parallel to the support surface.
In particular, the holding member 14 includes a pair of support rods 14a, and by moving the pair of support rods 14a symmetrically along the support surface 11, a wide variety of in-use bearings can be targeted, and the inner ring 1 Even when is deformed, measurement is possible, and a wide variety of dummy shafts are unnecessary.

In addition, since the load adding devices 16 and 25 for adding the load F in the measurement direction (radial direction or axial direction) to the outer ring 2 or the inner ring 1 are provided, the load F is gradually increased by this device so that it can be used in various ways. A measurement load suitable for each bearing can be added to the middle bearing.
Further, since the load F can be temporarily stopped while the load F is increased by this device and the outer ring 2 or the inner ring 1 is rotated, the gap due to local wear can be measured even when the sliding part is locally worn.

  In addition, a synchronous data detector 22 that synchronously captures the detection data 4 and 5 of the load cell 18 and the displacement sensor 20 is provided. From the displacement δ when the load F reaches a predetermined specified load by the gap calculation device 24. Since the clearance in the measurement direction is calculated, it is possible to easily and accurately measure the clearance of the bearing with a predetermined measurement load suitable for each bearing.

  Furthermore, the measurement direction is a radial direction or an axial direction of the bearing, and the support body 12 is configured to be able to roll the support surface 11 horizontally or vertically, so the radial gap and the axial gap are measured with the same device. can do.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.

It is a 1st embodiment figure of a bearing gap measuring device by the present invention. It is a figure which shows another form of the bearing clearance measuring apparatus of FIG. It is 2nd Embodiment figure of the bearing clearance measuring apparatus by this invention. It is explanatory drawing of the radial gap and axial gap of a bearing. It is a conceptual diagram of a radial clearance (radial clearance). It is a conceptual diagram of an axial gap (axial clearance). It is a schematic diagram which shows the mechanism of signal synchronization.

Explanation of symbols

1 Inner ring, 2 Outer ring, 3 Bearing, 4, 5 Electric signal,
10 Bearing clearance measuring device,
12 Support body (tilting / circular table),
11 Support surface, 13 Ball screw type support rod moving device,
14 holding member,
14a support bar, 14b gutter metal fitting, 14c clamping metal fitting,
16 load addition device,
16a female screw member, 16b male screw member, 16c female screw member,
17 Push-up plate,
18 load cell, 20 displacement sensor, 20a displacement sensor fixing jig,
22 synchronization data detector, 24 gap calculation device (PC),
25 Lever push-up type axial clearance load addition device,
25a lever

Claims (7)

A bearing gap measuring device for measuring a gap between bearings having an inner ring and an outer ring,
A support body having a support surface for fixing the bearing;
A holding member supported by the support body, extending vertically from the support surface, and capable of holding a side surface of the outer ring or the inner ring parallel to the support surface;
A load addition device that is supported by the support body and adds a load in the measurement direction to the outer ring or the inner ring;
A load cell installed between the load adding device and the outer ring or the inner ring for detecting the load;
A displacement sensor that is supported by the support body and detects a displacement amount of the outer ring or the inner ring in the measurement direction;
A synchronous data detector for synchronously capturing detection data of the load cell and the displacement sensor;
A bearing clearance measuring device, comprising: a clearance calculating device that calculates a clearance in a measurement direction from the amount of displacement when the load reaches a predetermined specified load.   The bearing clearance measuring device according to claim 1, wherein the measurement direction is a radial direction or an axial direction of the bearing.   The bearing clearance measuring device according to claim 1, wherein the support body is configured to be able to roll a support surface horizontally or vertically.   The holding member passes through the inner ring or the outer ring and extends vertically from the support body to above the support surface and is symmetrically movable along the support surface, and an outer periphery of the support rod And a clamp that supports one side surface of the inner ring or the outer ring, and a clamp that is movably provided on the outer periphery of the support rod and holds the inner ring or the outer ring between the clamps. The bearing clearance measuring device according to claim 1.   The load adding device includes a female screw member that is supported by the support body and has a female screw hole in a measurement direction of an outer ring, and a male screw member that is screwed into the female screw hole and extends in the measurement direction. The bearing gap measuring device according to 1.   The synchronization data detector is a signal control board that receives detection data of a load cell and a displacement sensor, outputs an error when the signals are not synchronized, and outputs only a synchronization signal. Item 2. The bearing clearance measuring device according to Item 1.   The bearing load measuring device according to claim 1, wherein the load adding device is a lever push-up type axial clearance load adding device.

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