JP2005069884A - Dynamic torque measuring apparatus for ball bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamic torque measuring apparatus for a ball bearing, capable of measuring dynamic torque values of the ball bearing while supposing installation errors or the like which may be generated when used actually. <P>SOLUTION: The dynamic torque measuring apparatus for the ball bearing is provided with a spindle shaft 14 which is rotated around a vertical axis along with the inner ring 161 of the ball bearing 16; a hollow rotating shaft 28 which is arranged around the spindle shaft 14 so as to be set coaxially with the spindle shaft 14; a static pressure gas bearing 29 which supports the hollow rotating shaft 28; and a ring-shaped dynamic torque measuring member 33 which is disposed on the upper end of the hollow rotating shaft 28 through an adapter ring 32. The dynamic torque measuring member 33 has an inner circumference surface 331 being fitted to the outer ring 162 of the ball bearing 16 and a tilting mechanism 41 for tilting the outer ring 162. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a rolling bearing dynamic torque measuring device used when grasping dynamic torque characteristics of a rolling bearing.

  Rolling bearings, such as ball bearings, may generate a small radial displacement called NRPO (Non Repeatable Run-out) due to dimensional errors of rolling elements and raceway groove shape errors. is there. Since such a small displacement greatly affects the rotational performance of the rolling bearing, when using a rolling bearing such as a ball bearing as a bearing for supporting the fan motor shaft of an air conditioner, for example, the dynamic torque of the rolling bearing is measured. It is important to know the rotational accuracy in advance.

Conventionally, as a device for measuring the dynamic torque of a rolling bearing, the inner ring of the rolling bearing is rotationally driven by a spindle shaft, and the outer ring of the rolling bearing is held by a holder, and the rolling sensor is rolled by a torque sensor connected to the holder through a wire. What measures the dynamic torque of a bearing is known (refer to patent documents 1 and 2).
JP 2000-155073 A JP 2001-194270 A

With the dynamic torque measuring device disclosed in the above document, it is possible to measure the dynamic torque when the rolling bearing is mounted in a normal state. However, for example, it is difficult to measure the dynamic torque when the outer ring of a rolling bearing is mounted in a tilted state with respect to a rotating shaft such as a fan motor shaft due to mounting errors, etc., which may occur during actual use. The appearance of a device capable of measuring the dynamic torque of a rolling bearing on the assumption of an installation error or the like has been desired.
The present invention has been made in view of such circumstances, and provides a rolling bearing dynamic torque measuring device capable of measuring the dynamic torque of a rolling bearing assuming mounting errors that may occur during actual use. The issue is to provide.

  In order to solve the above-mentioned problems, the invention of claim 1 is provided on the outer periphery of the spindle shaft such that a vertical spindle shaft that rotates integrally with the inner ring of the rolling bearing to be measured, and the spindle shaft and the shaft core coincide with each other. A hollow rotary shaft, a bearing that supports the hollow rotary shaft, and a ring-shaped dynamic torque measuring member installed at an upper end of the hollow rotary shaft via an adapter ring, the dynamic torque measuring member being the rolling It has an inner peripheral surface that fits with the outer ring of the bearing, and has an inclination imparting mechanism section that imparts an inclination to the outer ring.

According to a second aspect of the present invention, in the rolling bearing dynamic torque measuring device according to the first aspect, the tilt imparting bolt in which the tilt imparting mechanism portion protrudes from the lower surface of the dynamic torque measuring member and contacts the upper surface of the adapter ring, After adjusting the protrusion amount of the inclination imparting bolt, it comprises a nut for holding and fixing the protrusion amount.
According to a third aspect of the present invention, in the dynamic torque measuring device for a rolling bearing according to the first or second aspect, the spindle shaft has a small-diameter shaft portion that engages with the inner ring, and a preload is applied to the inner ring. It has a preloading load application mechanism part.

According to a fourth aspect of the present invention, there is provided the rolling bearing dynamic torque measuring device according to the third aspect, wherein the preload-loading mechanism portion is a cylindrical shape that is held by a vertical shaft portion that extends vertically from the upper end of the small-diameter shaft portion. A preload applying member, a spring member provided at the upper end of the preload applying member, a cylindrical spring receiving member provided at the upper end of the spring member, and fixing for fixing the spring receiving member to the vertical shaft portion It is characterized by comprising an industrial screw.
According to a fifth aspect of the present invention, in the dynamic torque measuring device for a rolling bearing according to any one of the first to fourth aspects, the bearing that supports the hollow rotary shaft is a static pressure gas bearing.

A sixth aspect of the present invention is the rolling bearing dynamic torque measuring device according to any one of the first to fifth aspects, wherein the center position of the dynamic torque measuring member is adjusted with respect to the axis of the spindle shaft. A mechanism is provided on the outer periphery of the dynamic torque measuring member.
A seventh aspect of the present invention is the rolling bearing dynamic torque measuring device according to the sixth aspect, wherein the alignment mechanism is provided on the outer periphery of the dynamic torque measuring member, and the alignment member. And a plurality of alignment bolts that protrude from the inner peripheral surface of the dynamic torque measuring member and abut against the outer peripheral surface of the dynamic torque measuring member, and a plurality of nuts that hold and fix the protruding amount after adjusting the protruding amount of the aligning bolt. It is characterized by that.
According to an eighth aspect of the present invention, in the dynamic torque measuring device for a rolling bearing according to the seventh aspect, the outer peripheral surface of the dynamic torque measuring member is formed in a spherical shape with the center of the inner ring of the rolling bearing as the center of curvature. And

In the rolling bearing dynamic torque measuring device according to the first and second aspects of the present invention, the dynamic torque can be measured in a state in which the outer ring of the rolling bearing to be measured is tilted. The dynamic torque of the rolling bearing can be measured assuming possible mounting errors.
In the rolling bearing dynamic torque measuring device according to the third and fourth aspects of the invention, a preload can be applied to the inner ring fitted on the small-diameter shaft portion of the spindle shaft. In addition to the above-described effects, a preload is applied to the inner ring. In this state, the dynamic torque of the rolling bearing can be measured.
In the rolling bearing dynamic torque measuring device according to the invention of claim 5, since frictional resistance does not occur between the hollow rotary shaft and the bearing, in addition to the above-described effects, dynamic torque is measured without being affected by the frictional resistance. can do.
In the rolling bearing dynamic torque measuring device according to the sixth to eighth aspects of the invention, the center position of the dynamic torque measuring member can be arbitrarily adjusted with respect to the axis of the spindle shaft. It is possible to accurately measure the dynamic torque of the rolling bearing, assuming possible mounting errors.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, reference numeral 11 denotes a base of a dynamic torque measuring device for a rolling bearing according to an embodiment of the present invention. A spindle shaft 14 is attached to a bracket 12 installed on the upper surface of the base 11 via a bearing unit 13. And a non-contact type rotational speed detector 15 for detecting the rotational speed of the spindle shaft 14 is attached.

  As shown in FIG. 2, the spindle shaft 14 has a small-diameter shaft portion 141 on the upper end side. An inner ring 161 of a ball bearing 16, which is one of the rolling bearings to be measured, is fitted to the small diameter shaft portion 141, and the inner ring 161 externally fitted to the small diameter shaft portion 141 is integrated with the spindle shaft 14. It is designed to rotate. The spindle shaft 14 has a pulley 17 (see FIG. 1) at the lower end. When the rotational torque of the drive motor 18 is transmitted to the pulley 17 via the pulley 19 and the belt 20, the spindle shaft 14 is externally connected to the small-diameter shaft portion 141. The fitted inner ring 161 rotates integrally with the spindle shaft 14. The drive motor 18 is fixed to a motor bracket 21 installed on the upper surface of the base 11.

  As shown in FIG. 2, a preload application mechanism 22 that applies a preload to the inner ring 161 of the ball bearing 16 is provided at the upper end of the spindle shaft 14. The preload-loading mechanism 22 is provided at a cylindrical preload-loading member 23 held by a vertical shaft 142 extending vertically from the upper end of the small-diameter shaft 141, and at the upper end of the preload-loading member 23. A spring member (for example, a wave washer for bearing, a disc spring, etc.) 24, a cylindrical spring receiving member 25 provided at the upper end of the spring member 24, and a fixing member for fixing the spring receiving member 25 to the vertical shaft portion 142 The spring force of the spring member 24 is transmitted to an inner ring 161 that is formed of a screw 26 and is externally fitted to the small-diameter shaft portion 141 of the spindle shaft 14. Therefore, this spring force is applied to the ball bearing 16 as a preload.

  A dynamic torque measuring unit 27 (see FIG. 1) for measuring the dynamic torque of the ball bearing 16 is provided on the upper portion of the bearing unit 13. The dynamic torque measurement unit 27 includes a hollow rotary shaft 28 provided on the outer periphery of the spindle shaft 14 with the spindle shaft 14 aligned with the axis, and a hydrostatic gas bearing 29 that supports the hollow rotary shaft 28. In addition, flanges 30 and 31 are provided at the upper end and the lower end of the hollow rotary shaft 28. These flanges 30 and 31 are opposed to the end face of the static pressure gas bearing 29, and a gas such as air is jetted from the end face and the inner peripheral surface of the static pressure gas bearing 29.

  The dynamic torque measuring unit 27 includes a dynamic torque measuring member 33 installed at the upper end of the hollow rotary shaft 28 via the adapter ring 32. The dynamic torque measuring member 33 is formed in a ring shape, and the dynamic torque measuring member 33 is formed with an inner peripheral surface 331 (see FIGS. 2 and 3) that fits with the outer ring 162 of the ball bearing 16. Further, the dynamic torque measuring member 33 is fixed to the upper surface of the adapter ring 32 by a plurality of bolts 34 (see FIG. 3) arranged at a constant pitch in the circumferential direction of the member 33. An annular convex portion 35 (see FIG. 2) that fits with the inner peripheral surface of the adapter ring 32 is formed on the lower surface. The adapter ring 32 is fixed to the upper surface of the flange 30 by a plurality of bolts 36 (see FIG. 2) arranged at a constant pitch in the circumferential direction of the ring 32. An annular convex portion 37 (see FIG. 2) that fits with the inner peripheral surface of the rotating shaft 28 is formed.

The hollow rotary shaft 28 has a dynamic torque detection arm 38 (see FIG. 2) on the upper surface of the flange 30, and the housing 39 that fixes and supports the static pressure gas bearing 29 is interposed via the dynamic torque detection arm 38. A torque sensor 40 for detecting the dynamic torque of the ball bearing 16 is attached.
The dynamic torque measuring member 33 is provided with an inclination imparting mechanism 41 (see FIG. 2) that imparts an inclination to the outer ring 162 of the ball bearing 16. The tilt imparting mechanism 41 projects from the lower surface of the dynamic torque measuring member 33 and contacts the upper surface of the adapter ring 32. After adjusting the projecting amount of the tilt imparting bolt 42, the projecting amount is held and fixed. The dynamic torque measuring member 33 is formed with a bolt hole screwed into the tilt imparting bolt 42 at a predetermined position (on the PCD of the bolt 34).

  On the outer periphery of the dynamic torque measuring member 33, a centering mechanism 45 (see FIG. 3) for adjusting the center position of the dynamic torque measuring member 33 with respect to the axis of the spindle shaft 14 is provided. The alignment mechanism 45 includes a ring-shaped alignment member 46 provided on the outer periphery of the dynamic torque measuring member 33, and projects from the inner peripheral surface of the alignment member 46 to contact the outer peripheral surface of the dynamic torque measuring member 33. A plurality of aligning bolts 47 in contact with each other and a plurality of nuts 48 for holding and fixing the protruding amounts after adjusting the protruding amounts of the aligning bolts 47. The outer peripheral surface of the dynamic torque measuring member 33 is shown in FIG. As shown, the ball bearing 16 is formed in a spherical shape with the inner ring center O as the center of curvature. The alignment member 46 is fixed to the upper surface of the adapter ring 32 by a plurality of bolts 49. Further, laser type micro displacement meters 50 and 51 (see FIG. 2) for detecting the inclination of the outer ring 162 by irradiating laser beams to the positions P1 and P2 shown in FIG. .

  In the dynamic torque measuring device for a rolling bearing according to the embodiment of the present invention configured as described above, the inclination imparting bolt 42 protruding from the lower surface of the dynamic torque measuring member 33 and abutting on the upper surface of the adapter ring 32, and the inclination imparting. After adjusting the protrusion amount of the bolt 42, the ball bearing 16 is provided with the inclination applied to the outer ring 162 by providing the dynamic torque measuring member 33 with the inclination imparting mechanism portion 41 including the nut 43 that holds and fixes the protrusion amount. Therefore, it is possible to measure the dynamic torque of the ball bearing 16 assuming an installation error or the like that may occur during actual use.

  In the above-described embodiment, the cylindrical preload load applying member 23 held by the vertical shaft portion 142 extending vertically from the upper end of the small diameter shaft portion 141 and the upper end of the preload load applying member 23 are provided. A preload-loading mechanism 22 comprising a spring member 24, a cylindrical spring receiving member 25 provided at the upper end of the spring member 24, and a fixing screw 26 for fixing the spring receiving member 25 to the vertical shaft portion 142. Since the spring force of the spring member 24 can be transmitted to the inner ring 161 externally fitted to the small-diameter shaft portion 141 of the spindle shaft 14, the dynamic torque is applied with a preload applied to the ball bearing 16. Can be measured.

Furthermore, in the above-described embodiment, since the bearing that supports the hollow rotary shaft 28 is the static pressure gas bearing 29, no frictional resistance is generated between the hollow rotary shaft 28 and the bearing 29. The dynamic torque can be measured without receiving.
Further, in the above-described embodiment, the ring-shaped alignment member 46, and a plurality of alignment bolts 47 that protrude from the inner peripheral surface of the alignment member 46 and abut on the outer peripheral surface of the dynamic torque measuring member 33, After adjusting the protruding amount of the alignment bolt 47, the alignment mechanism portion 45 including a plurality of nuts 48 for holding and fixing the protruding amount is provided on the outer periphery of the dynamic torque measuring member 33. Since the center position of the dynamic torque measuring member 33 can be arbitrarily adjusted with respect to the core, it is possible to more accurately measure the dynamic torque of the ball bearing 16 assuming an installation error or the like that may occur during actual use.

  The present invention is not limited to the embodiment described above. For example, a microphone for acoustic measurement is provided in the vicinity of the ball bearing 16, and the generation status of the bearing noise and the noise level are measured with this microphone, and the degree of influence of the mounting error of the outer ring on the acoustic characteristics of the bearing is grasped. Also good. Further, as the spring member 24, a normal wave washer may be used if there is no problem in size.

It is a longitudinal section showing a schematic structure of a dynamic torque measuring device for rolling bearings concerning one embodiment of the present invention. It is a longitudinal cross-sectional view which shows the principal part of the dynamic torque measuring apparatus for rolling bearings concerning one Embodiment of this invention. It is a top view of the dynamic torque measuring apparatus for rolling bearings shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Base 12 Bracket 13 Bearing unit 14 Spindle shaft 141 Small diameter shaft part 142 Vertical shaft part 15 Rotational speed detector 16 Ball bearing 161 Inner ring 162 Outer ring 17 Pulley 18 Drive motor 19 Pulley 20 Belt 21 Motor bracket 22 Preloading load applying mechanism part 23 Preload Load applying member 24 Spring member 25 Spring receiving member 26 Fixing screw 27 Dynamic torque measuring unit 28 Hollow rotary shaft 29 Static pressure gas bearing 30, 31 Flange 32 Adapter ring 33 Dynamic torque measuring member 331 Inner peripheral surface 34 of dynamic torque measuring member , 36 Bolts 35, 37 Annular convex portion 38 Dynamic torque detecting arm 39 Housing 40 Torque sensor 41 Tilt imparting mechanism portion 42 Tilt imparting bolt 43 Nut 45 Alignment mechanism portion 46 Alignment member 47 Alignment bolt 48 Nut 49 Bolt 50 51 laser type micro-displacement meter

Claims (8)

  A vertical spindle shaft that rotates integrally with the inner ring of the rolling bearing to be measured, a hollow rotary shaft that is provided on the outer periphery of the spindle shaft with the spindle shaft aligned with the axis, and a bearing that supports the hollow rotary shaft A ring-shaped dynamic torque measuring member installed via an adapter ring at the upper end of the hollow rotary shaft, and the dynamic torque measuring member has an inner peripheral surface that fits with the outer ring of the rolling bearing, and A dynamic torque measuring device for a rolling bearing, comprising an inclination imparting mechanism for imparting an inclination to an outer ring.   The dynamic torque measuring device for a rolling bearing according to claim 1, wherein the inclination imparting mechanism portion projects from a lower surface of the dynamic torque measurement member and abuts on an upper surface of the adapter ring, and a protrusion amount of the inclination imparting bolt. A rolling bearing dynamic torque measuring device comprising: a nut that holds and fixes the protruding amount after adjusting.   The dynamic torque measuring device for a rolling bearing according to claim 1 or 2, wherein the spindle shaft has a small-diameter shaft portion that engages with the inner ring, and a preload-loading mechanism portion that applies a preload to the inner ring. A dynamic torque measuring device for rolling bearings.   The dynamic torque measuring device for a rolling bearing according to claim 3, wherein the preload-loading mechanism is a cylindrical preload-loading member held by a vertical shaft extending vertically from the upper end of the small-diameter shaft, and A spring member provided at the upper end of the preload applying member, a cylindrical spring receiving member provided at the upper end of the spring member, and a fixing screw for fixing the spring receiving member to the vertical shaft portion. A dynamic torque measuring device for rolling bearings.   5. The dynamic torque measuring device for a rolling bearing according to claim 1, wherein the bearing supporting the hollow rotary shaft is a static pressure gas bearing. 6.   6. The dynamic torque measuring device for a rolling bearing according to claim 1, wherein an alignment mechanism that adjusts a center position of the dynamic torque measuring member with respect to an axis of the spindle shaft includes the dynamic torque. A dynamic torque measuring device for a rolling bearing, which is provided on an outer periphery of a measuring member.   The dynamic torque measuring device for a rolling bearing according to claim 6, wherein the alignment mechanism portion projects from a ring-shaped alignment member provided on an outer periphery of the dynamic torque measurement member, and an inner peripheral surface of the alignment member. A rolling bearing comprising: a plurality of aligning bolts that contact the outer peripheral surface of the dynamic torque measuring member; and a plurality of nuts that hold and fix the protruding amounts after adjusting the protruding amounts of the aligning bolts Dynamic torque measuring device.   8. The dynamic torque measuring device for a rolling bearing according to claim 7, wherein an outer peripheral surface of the dynamic torque measuring member is formed in a spherical shape with an inner ring center of the rolling bearing as a center of curvature. measuring device.

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