JP2009168766A - Device for measuring retention radial internal clearance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for measuring retention radial internal clearance which can inhibit degradation in cylindricity caused by empty weight of the gauge itself to minimize setting error of the retention radial internal clearance. <P>SOLUTION: This retention radial internal clearance measuring device 10 includes a pair of pedestals 17, 18 facing base of the gauge body 11 on both aperture 12 side and slit section 13 side to support the gauge body 11, which externally fits inner circumference of the gauge body 11 in a plurality of cylindrical rollers incorporated into inner race to measure circumscribed circle diameter of these plural cylindrical rollers. When the gauge body 11 is cut along over a virtual line S1 passing through circumferential intermediate position of the slit section 13 and the center O of the gauge body 11, the pair of pedestals 17, 18 will include arc sections 17c, 17d, 18c, 18d separated from the above virtual line S1 beginning at barycentric position G1 of one semicircle ring part 11b and barycentric position G2 of another semicircle ring part 11c. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a residual radial internal clearance device that measures a residual radial internal clearance when a cylindrical roller bearing used in, for example, a spindle of a machine tool, a rotary table, a spindle turning mechanism, a rotary support of a printing press, or the like is incorporated.

  For example, in a spindle device of a machine tool such as an NC lathe or a machining center, particularly when rigidity is required, a double row cylindrical roller bearing 103 (or a single row) is provided between a housing 101 and a spindle 102 as shown in FIG. Cylindrical roller bearings) are used.

  In this cylindrical roller bearing 103, the fitting surface between the inner ring 104 and the main shaft 102 is a tapered surface, and after the inner ring 104 is fitted to the main shaft 102, the inner ring 104 is moved to the larger diameter side of the tapered surface. The circumscribed circle diameter of the cylindrical roller 105 is expanded by the taper surface. In this state, the clearance between the outer surface of the cylindrical roller 105 and the inner peripheral surface of the outer ring 106 becomes a residual radial internal clearance.

  Residual radial internal clearance is usually measured with a jig such as a dial gauge or shim after assembling the bearings. However, it is often used up to negative clearance in machine tools such as NC lathes. Cannot be measured. For this reason, a residual radial internal clearance measuring device capable of directly measuring the circumscribed circle diameter of the cylindrical roller is used for measuring the residual radial internal clearance (see, for example, Non-Patent Document 1 and Patent Document 1).

  This residual radial internal clearance measuring device 110 includes an annular gauge body 111 as shown in FIG. The gauge body 111 has an opening 112 formed by cutting a part in the circumferential direction. The gauge body 111 is open to the inner peripheral surface on the opposite side of the opening 112 from the center of the gauge body 111. A substantially T-shaped slit 113 that extends from the peripheral surface toward the outer peripheral surface and extends substantially linearly on both sides in the circumferential direction on the outer diameter side is formed.

  The gauge body 111 includes a set screw 114 that adjusts the circumferential distance of the opening 112, a dial gauge 115 that displays the inner diameter of the gauge body 111, and a dial gauge that adjusts the pointer of the dial gauge 115. A pointer adjustment bolt 116 is provided. By tightening the set screw 114, the gauge body 111 is elastically deformed radially outward to widen the circumferential interval between the openings 112, and by loosening the set screw 114, the opening due to the elastic restoring force of the gauge body 111 is opened. The interval of 112 in the circumferential direction is narrowed (returned to the original).

  Further, on the opening 112 side and the slit portion 113 side, a pair of pedestals 117 and 118 that are opposed to the bottom surface of the gauge main body 111 and support the gauge main body 111 are provided, and each of the pedestals 117 and 118 has a diameter. A holder 119 extending outward in the direction is attached.

  In order to measure the residual radial internal clearance, referring to FIG. 7, first, the inner diameter dimension A of the outer ring 106 fitted in the housing 101 is measured using a cylinder gauge 120 (see FIG. 8) (FIG. 8). 7 (a)). Next, as shown in FIG. 7B, the cylinder gauge 120 is applied to the inner peripheral surface of the measuring device 110, and the set screw 114 of the measuring device 110 is turned so that the inner diameter dimension A ′ of the gauge body 111 becomes the inner diameter dimension of the outer ring 106. The inner diameter A of the outer ring 106 is copied by adjusting to A. In this state, the dial gauge pointer adjusting bolt 116 is turned to set the pointer of the dial gauge 115 to the reference value.

  Next, as shown in FIG. 7C, after the outer peripheral surface of the gauge body 111 is externally fitted to the plurality of cylindrical rollers 105 incorporated in the inner ring 104 fitted to the main shaft 102, the set screw 114 is loosened. Then, the gauge body 111 whose inner diameter is expanded is returned to its original state by its elastic restoring force, and clamped so that the inner peripheral surface of the gauge body 111 is in contact with the cylindrical roller 105. Then, by comparing the reference value B of the dial gauge 115 in this state with the reference value, as shown in FIG. 7D, the residual radial internal clearance when the cylindrical roller bearing 103 is assembled is measured. Based on this measured value, adjust to the required appropriate clearance (regardless of positive or negative clearance).

  Moreover, in the measuring apparatus described in Patent Document 1, a circumferential groove having a concave cross section is formed along the entire circumference in the circumferential direction of the gauge body to reduce weight, and the circumferential groove and a substantially T-shaped slit portion are provided. Are connected to distribute the stress in the slit portion.

NSK Ltd. Catalog precision rolling bearing CAT. No. 1254 2002 E-10 PAGE114-115,184-185 JP 2007-212432 A

  By the way, in the conventional residual radial internal clearance measuring device, as shown in FIGS. 7A and 7B, the inner diameter A of the outer ring 106 fitted in the housing 101 is determined using a cylinder gauge 120. When the work is copied to the inner peripheral surface of 111, the gauge main body 111 is not placed vertically (the radial direction is the vertical direction) but horizontally (the radial direction is the horizontal direction) for reasons such as to facilitate the work. Sometimes.

  In this case, the bending rigidity of the gauge main body 111 is reduced due to the opening 112 and the slit 113, and each half of the gauge main body 111 divided by the opening 112 and the slit 113 as shown in FIG. Since the center-of-gravity positions G1 and G2 of the annular portion are located outside the pedestals 117 and 118, the gauge body 111 is bent on the pedestals 117 and 118 by its own weight. As a result, the cylindricity of the inner peripheral surface of the gauge main body 111 deteriorates (an inclination of several μm occurs in the gauge main body 111 such that the upper end dimension of the inner peripheral surface of the gauge main body 111> the lower end dimension). The measured value varies, and an error occurs when the inner diameter A of the outer ring 106 is copied onto the inner peripheral surface of the gauge body 111.

  In the case of a machine tool as shown in FIG. 5, the radial rigidity of the main shaft 102 is substantially determined by the cylindrical roller bearing 103 and greatly influenced by whether or not the residual radial internal clearance is accurately set. It is necessary to make the setting error of the residual radial internal clearance as small as possible (usually, the setting error of the residual radial internal clearance is preferably 2 to 3 μm or less, preferably 1 μm or less).

  A residual radial internal clearance measuring device is required according to the size and name of the cylindrical roller bearing to be measured.The larger the size, the larger the measuring device itself, and the cylindricity due to the weight of the gauge body itself. Deterioration becomes remarkable.

  The present invention has been made in order to eliminate such inconveniences, and an object of the present invention is to suppress the deterioration of cylindricity due to the weight of the gauge body when the gauge body is placed horizontally, An object of the present invention is to provide a residual radial internal clearance measuring device capable of minimizing a clearance setting error.

The above object of the present invention is achieved by the following configurations.
(1) A part in the circumferential direction is cut to form an opening, and at the position opposite to the opening, an opening is formed on the inner peripheral surface, and extends from the inner peripheral surface toward the outer peripheral surface. And a substantially annular gauge body in which a substantially T-shaped slit portion extending on both sides in the circumferential direction on the outer diameter side is formed,
A measuring instrument for displaying the inner diameter of the gauge body;
A set screw for adjusting the circumferential spacing of the openings;
A pair of pedestals facing the bottom surface of the gauge body on the opening side and the slit part side and supporting the gauge body,
A residual radial internal clearance measuring device that externally fits the inner peripheral surface of the gauge body to a plurality of cylindrical rollers incorporated in an inner ring of a cylindrical roller bearing, and measures a circumscribed circle diameter of the plurality of cylindrical rollers,
The pair of pedestals includes the center of gravity of one semi-annular portion and the other half when the gauge body is cut along a virtual line passing through a circumferential intermediate position of the slit portion and the center of the gauge body. A residual radial internal clearance measuring device having an auxiliary portion that is further away from the virtual line than the center of gravity of an annular portion.
(2) The residual radial internal clearance measuring device according to (1), wherein the auxiliary portion is formed integrally with a pedestal body to which a holder is attached.
(3) The residual radial internal clearance measuring device according to (1), wherein the auxiliary portion is an auxiliary pedestal that is separate from the pedestal main body to which the holder is attached and is attached to the bottom surface of the gauge main body.
(4) In any one of (1) to (3), a circumferential groove having a concave section is formed along the entire circumference in the axial central portion of the outer peripheral surface of the gauge body. The residual radial internal clearance measuring device described.

  According to the residual radial internal clearance measuring device of the present invention, the pair of pedestals are arranged in one half when the gauge body is cut along a virtual line passing through the intermediate position in the circumferential direction of the slit portion and the center of the gauge body. Since it has an auxiliary part that is further away from the virtual line than the center of gravity of the annular part and the center of the other semi-annular part, it suppresses the deterioration of the cylindricity due to its own weight when the gauge body is placed horizontally. As a result, the setting error of the residual radial internal clearance can be minimized.

  Hereinafter, an embodiment of a residual radial internal clearance measuring device according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
As shown in FIG. 1, the residual radial internal clearance measuring device 10 of the present embodiment includes a substantially annular gauge body 11. The gauge body 11 is formed with an opening 12 that is partially cut in the circumferential direction, and opens to the inner peripheral surface on the opposite side of the opening 12 with respect to the center O of the gauge body 11. A substantially T-shaped slit portion 13 extending from the inner peripheral surface toward the outer peripheral surface and extending substantially linearly on both sides in the circumferential direction on the outer diameter side is formed.

  As shown in FIG. 2, a thin portion 11a is formed between the slit portion 13 and the outer peripheral surface of the gauge body 11, and the thin portion 11a is formed in the gauge body 11 with reference to FIG. When the peripheral surface is fitted to the cylindrical roller 105, it functions as a leaf spring that applies an appropriate measurement load to the circumscribed portion of the cylindrical roller 105. If the thickness T in the radial direction of the thin portion 11a is not appropriate, the measurement load applied to the circumscribed portion of the cylindrical roller 105 is not stable, and a measurement error, a rolling defect, or the like occurs. Therefore, in this embodiment, in order to suppress variation in accuracy of the thickness T in the radial direction of the thin portion 11a, the outer peripheral surface of the gauge body 11 is finished to a flat surface by final polishing after the slit portion 13 is processed. The machining allowance for the finish surface polishing is left when the slit portion 13 is processed.

  Returning to FIG. 1, the gauge body 11 includes a set screw 14 that adjusts the circumferential interval of the opening 12, a dial gauge 15 that is a measuring instrument that displays the inner diameter of the gauge body 11, and the dial gauge. A dial gauge pointer adjusting bolt 16 for adjusting 15 pointers is provided. By tightening the set screw 14, the gauge body 11 is elastically deformed radially outward to widen the circumferential distance of the opening 12, and by loosening the set screw 14, the opening due to the elastic restoring force of the gauge body 11 The 12 circumferential intervals are reduced (returned to the original). Here, the measuring instrument for displaying the inner diameter of the gauge body 11 may be a dial gauge, a minimeter (micrometer), an electric micrometer, or the like.

  Further, on the opening 12 side and the slit portion 13 side, a pair of pedestals 17 and 18 that are opposed to the bottom surface of the gauge body 11 and support the gauge body 11 are provided. A holder 19 that extends radially outward from the outer peripheral surface of the main body 11 is attached.

  As shown in FIG. 1 (b), the pedestals 17 and 18 are formed in a substantially L shape in a side view, and are bent from the attachment portions 17a and 18a to which the holder 19 is attached, and the attachment portions 17a and 18a, A substantially trapezoidal pedestal base 17b, 18b that extends toward the bottom surface of the gauge body 11 and overlaps the opening 12 or the slit 13 in the axial direction, and is formed continuously from the pedestal base 17b, 18b in the circumferential direction. And arc portions 17c, 17d, 18c, and 18d as auxiliary portions substantially concentric with the gauge body 11. The base portions 17b and 18b and the arc portions 17c, 17d, 18c, and 18d have a substantially uniform thickness and face the bottom surface of the gauge body 11.

  Here, in the present embodiment, when the gauge body 11 is cut along an imaginary line S1 passing through the circumferential intermediate position of the slit portion 13 and the center O of the gauge body 11, one semi-annular ring is cut. The center of gravity of the part 11b is G1, and the center of gravity of the other semi-annular part 11c is G2. In this case, the tip portions of the circular arc portions 17c and 18c are formed to be longer from the virtual line S1 by Δ1 and Δ2, respectively, from the gravity center position G1. The tip portions of the arc portions 17d and 18d are also formed longer than the center of gravity position G2 by Δ3 and Δ4 so as to be separated from the virtual line S1.

  Thereby, when the gauge main body 11 is placed horizontally, the gauge main body 11 is supported in a state in which bending is suppressed by the pedestals 17 and 18, and deterioration of cylindricity due to the weight of the gauge main body 11 can be suppressed. Note that the values (positive values) of Δ1 to Δ4 may or may not be the same. The method for measuring the residual radial internal clearance is the same as that already described with reference to FIG. Further, each pedestal 17 and 18 is only required to be fastened and fixed to the gauge body 11 on either side of the semi-annular portions 11b and 11c. In this embodiment, both are on the other semi-annular portion 11c side. It is fixed with.

  As described above, according to the residual radial internal clearance measuring device 10 of the present embodiment, the pair of pedestals 17 and 18 are assumed to pass through the circumferential intermediate position of the slit portion 13 and the center O of the gauge body 11. Arc portions 17c and 17d that are separated from the virtual line S1 from the center of gravity position G1 of one semi-annular portion 11b and the center of gravity position G2 of the other semi-annular portion 11c when the gauge body 11 is cut along the line S1. , 18c and 18d, it is possible to suppress the deterioration of the cylindricity due to the weight of the gauge body 11 when the gauge body 11 is placed horizontally, thereby reducing the setting error of the residual radial internal clearance as much as possible. be able to.

  Further, the arc portions 17c, 17d, 18c, and 18d as auxiliary portions of the present embodiment are formed integrally with a pedestal main body including the attachment portions 17a and 18a and the pedestal base portions 17b and 18b to which the holder 19 is attached. Accordingly, the present invention can be applied to a conventional residual radial internal clearance measuring device by replacing the pedestals 17 and 18 with the conventional pedestals 117 and 118.

(Second Embodiment)
Next, a residual radial internal clearance measuring apparatus according to a second embodiment of the present invention will be described in detail with reference to FIG. In addition, about the part which overlaps with 1st Embodiment or it corresponds, the same code | symbol is attached | subjected to a figure, and description is abbreviate | omitted or simplified.

  In the residual radial internal clearance measuring device 20 of the present embodiment, the pair of pedestals 17 ′ and 18 ′ have attachment portions 17 a and 18 a and pedestal base portions 17 b and 18 b and are formed continuously from the pedestal base portions 17 b and 18 b. Further, linear portions 17e, 17f, 18e, and 18f are provided as auxiliary portions that pass through the center O of the gauge body 11 and extend substantially parallel to the other virtual line S2 orthogonal to the above-described virtual line S1. The base portions 17b and 18b and the straight portions 17e, 17f, 18e, and 18f have a substantially uniform thickness and face the bottom surface of the gauge body 11.

  Also in this case, the tip portions of the straight portions 17e and 18e are formed to be longer from the virtual line S1 by Δ1 and Δ2, respectively, from the gravity center position G1. In addition, the tip portions of the straight portions 17f and 18f are also formed to be longer from the virtual line S1 by Δ3 and Δ4 than the center of gravity position G2. Thereby, the deterioration of the cylindricity due to the weight of the gauge body 11 when the gauge body 11 is placed horizontally can be suppressed.

In the present embodiment, a circumferential groove 21 having a concave cross section is formed along the entire circumference in the axial center of the outer circumferential surface of the gauge body 11. This makes it possible to reduce the weight of the gauge body 11 while ensuring a cross-sectional secondary moment on the basis of the axis (larger secondary moment / cross-sectional area). That is, the distorted deformation (cause of measurement error) generated on the inner peripheral surface of the gauge body 11 during measurement, the inclination due to the weight of the gauge body 11, and the like can be minimized.
Other configurations and operations are the same as those of the first embodiment.

(Third embodiment)
Next, a residual radial internal clearance measuring apparatus according to a third embodiment of the present invention will be described in detail with reference to FIG. In addition, about the part which overlaps with 1st Embodiment or it corresponds, the same code | symbol is attached | subjected to a figure, and description is abbreviate | omitted or simplified.

  In the residual radial internal clearance measuring device 30 of the present embodiment, the pair of pedestals 17 ″ and 18 ″ are substantially parallel to the mounting portions 17a and 18a, the pedestal base portions 17b and 18b, and the other virtual line S2 described above. From a pedestal body provided with extending straight portions 17e ', 17f', 18e ', 18f', and a centroid position G1 of one semi-annular portion 11b that is separate from the pedestal body and is located on the other virtual line S2. Auxiliary pedestal 31 as an auxiliary part separated from imaginary line S1 by Δ1, and a phantom line by Δ3 from the gravity center position G2 of the other semi-annular part 11c, which is separate from the pedestal main body and is located on the other virtual line S2. And an auxiliary pedestal 32 as an auxiliary portion away from S1. The straight line portions 17e ′, 17f ′, 18e ′, and 18f ′ are arranged closer to the imaginary line S1 than the gravity center positions G1 and G2, similarly to the conventional bases 117 and 118.

  The auxiliary pedestals 31 and 32 have pedestal base portions 17 b and 18 b and straight portions 17 e ′, 17 f ′, 18 e ′, and 18 f ′ and a substantially uniform thickness, and are fastened and fixed to the bottom surface of the gauge body 11. As a result, when the gauge body 11 is placed horizontally, the gauge body 11 is supported in a state in which bending is suppressed by the pedestals 17 ″ and 18 ″ and the auxiliary pedestals 31 and 32. The deterioration of the cylindricity due to can be suppressed. Further, since the auxiliary pedestals 31 and 32 are formed separately from the pedestal main body, the present invention can be applied to a conventional residual radial internal clearance measuring device by attaching the auxiliary pedestals 31 and 32.

  Other configurations and operational effects are the same as those of the first and second embodiments. The auxiliary pedestals 31 and 32 may be separately provided on both sides of the virtual line S2 for each of the pedestals 17 ″ and 18 ″ (a total of four locations). However, as in the present embodiment, each of the pedestals 17 and 32 is provided. It is more preferable from the viewpoint of the number of parts that the common parts “″ and 18 ″ are arranged in two places.

  In addition, this invention is not limited to what was illustrated by said each embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

It is a figure for demonstrating the residual radial internal clearance measuring apparatus which concerns on 1st Embodiment of this invention, (a) is a top view, (b) is a side view of (a). It is explanatory drawing for demonstrating the thin part of a gauge main body. It is a figure for demonstrating the residual radial internal clearance measuring apparatus which concerns on 2nd Embodiment of this invention, (a) is a top view, (b) is a side view of (a). It is a figure for demonstrating the residual radial internal clearance measuring apparatus which concerns on 3rd Embodiment of this invention, (a) is a top view, (b) is a side view of (a). It is sectional drawing which shows an example of the spindle apparatus of a machine tool. It is a figure for demonstrating the conventional residual radial internal clearance measuring apparatus, (a) is a top view, (b) is a side view of (a). It is explanatory drawing for demonstrating the measuring method of a residual radial internal clearance. It is explanatory drawing for demonstrating the malfunction which this gauge main body bends by dead weight and a cylindricity deteriorates when a gauge main body is set horizontally.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Residual radial internal clearance measuring device 11 Gauge main body 11b One semi-annular part 11c The other semi-annular part 12 Opening part 13 Slit part 14 Set screw 15 Dial gauges 17, 18, 17 ', 18', 17 ", 18 ″ pedestals 17c, 17d, 18c, 18d Arc part (auxiliary part)
17e, 17f, 18e, 18f Straight line part (auxiliary part)
21 Circumferential groove 31, 32 Auxiliary base (auxiliary part)
103 Cylindrical roller bearing 104 Inner ring 105 Cylindrical roller

Claims (4)

A part in the circumferential direction is cut to form an opening, and at a position opposite to the opening, the opening opens to the inner peripheral surface, extends from the inner peripheral surface toward the outer peripheral surface, and A substantially annular gauge body in which a substantially T-shaped slit portion extending on both sides in the circumferential direction on the radial side is formed;
A measuring instrument for displaying the inner diameter of the gauge body;
A set screw for adjusting the circumferential spacing of the openings;
A pair of pedestals facing the bottom surface of the gauge body on the opening side and the slit part side and supporting the gauge body,
A residual radial internal clearance measuring device that externally fits the inner peripheral surface of the gauge body to a plurality of cylindrical rollers incorporated in an inner ring of a cylindrical roller bearing, and measures a circumscribed circle diameter of the plurality of cylindrical rollers,
The pair of pedestals includes the center of gravity of one semi-annular portion and the other half when the gauge body is cut along a virtual line passing through a circumferential intermediate position of the slit portion and the center of the gauge body. A residual radial internal clearance measuring device having an auxiliary portion that is further away from the virtual line than the center of gravity of an annular portion.   The residual radial internal clearance measuring device according to claim 1, wherein the auxiliary portion is formed integrally with a pedestal body to which a holder is attached.   2. The residual radial internal clearance measuring device according to claim 1, wherein the auxiliary portion is an auxiliary pedestal attached to a bottom surface of the gauge main body separately from a pedestal main body to which a holder is attached.   The residual radial interior according to any one of claims 1 to 3, wherein a circumferential groove having a concave cross section is formed along the entire circumference in the axial center of the outer peripheral surface of the gauge body. Clearance measuring device.

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