JP2005331026A - Angular ball bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce processing time and processing cost for polishing and processing a counter part of an outer race. <P>SOLUTION: In this angular ball beating 11, a plurality of rolling bodies 15 rotatably held by a cage 14 are interposed at a contact angle between both raceway surfaces 12a and 13a of an inner race 12 and the outer race 13. The counter part 16 formed in close vicinity to the raceway surface 13a of the outer race 13, has a first counter surface 16a adjacent to the raceway surface 13a and inclining at a predetermined angle in the shaft direction, and a second counter surface 16b adjacent to its first counter surface 16a and having an inclination larger than an inclination of the first counter surface 16a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an angular ball bearing used, for example, for a spindle of a machine tool.

  For example, an angular contact ball bearing 1 used for a spindle of a machine tool has a plurality of rotatably held by a cage 4 between both raceway surfaces 2a and 3a of an inner ring 2 and an outer ring 3 as shown in FIG. The rolling element 5 is interposed with a contact angle.

  In this type of angular ball bearing 1, as shown in FIG. 5, the counter part 6 formed close to the raceway surface 3a of the outer ring 3 so that the inner ring 2, the outer ring 3 and the rolling element 5 have a non-separation structure. It is designed to have a tick length t called. In the figure, a counter portion 6 having a counter surface 6a having an inclination angle α with respect to the axial direction is formed on the inner diameter surface of the outer ring 3 that is close to the raceway surface 3a.

  Therefore, when assembling the angular ball bearing 1, since the inner ring 2, the outer ring 3 and the rolling element 5 have a non-separation structure because there is a clicking margin t at room temperature, the outer ring 3 is normally thermally expanded. I am doing so. Thus, the outer ring 3 is thermally expanded to facilitate the assembly of the inner ring 2, the outer ring 3 and the rolling element 5. At present, the counter unit 6 is polished and managed so as to have an appropriate tapping margin t.

  By the way, in the angular ball bearing 1 described above, the entire surface of the counter portion 6 of the outer ring 3 is polished and finished so as to ensure an appropriate tapping margin t at present. For this reason, there is a problem that it takes time for processing and the processing cost increases.

  Therefore, the present invention has been proposed in view of the above-mentioned problems, and its object is to provide an angular ball bearing that can reduce the processing time and processing cost for polishing and finishing the counter portion of the outer ring. is there.

  As a technical means for achieving the above-mentioned object, the present invention provides an angular structure in which a plurality of rolling elements rotatably held by a cage are interposed between both raceways of an inner ring and an outer ring with a contact angle. In the ball bearing, a counter portion formed close to the raceway surface of either the inner ring or the outer ring is adjacent to the raceway surface and has a first counter surface inclined at a predetermined angle with respect to the axial direction. And a second counter surface adjacent to the first counter surface and having an inclination angle larger than the inclination angle of the first counter surface.

  In the present invention, the counter section includes a first counter surface having a predetermined inclination angle necessary for securing an appropriate crisp margin and a second counter surface not involved in the aforementioned crisp margin. For this reason, in order to secure an appropriate margin, it is only necessary to manage the first counter surface adjacent to the track surface.

In the above configuration, it is desirable to finish the first counter surface. By polishing the first counter surface in this way, it is possible to secure an appropriate squeeze margin, and there is no need to polish the entire counter part, and only the first counter surface is polished. Therefore, it is easy to reduce the processing time and the processing cost by the partial polishing finish.
In the above-described configuration, it is desirable that the inclination angle of the first counter surface is 3 ° or less, particularly 0 °. Thus, when the inclination angle of the first counter surface is 0 °, the first counter surface is a flat surface parallel to the axial direction. Thus, if the inclination angle of the first counter surface is set to 0 ° to make it a flat surface, dimensional management at the time of bearing processing and setting of a processing jig can be simplified.

  According to the present invention, the counter portion formed close to the raceway surface of either the inner ring or the outer ring is adjacent to the raceway surface and is inclined at a predetermined angle with respect to the axial direction. And a second counter surface adjacent to the first counter surface and having an inclination angle greater than the inclination angle of the first counter surface. It is only necessary to polish the first counter surface adjacent to the surface. As a result, it is not necessary to polish the entire counter section, and only the first counter surface needs to be polished. Therefore, it is possible to reduce the processing time and processing cost and improve the assemblability. An inexpensive angular ball bearing can be provided.

  1 to 3 are for explaining an embodiment of the present invention that can be applied as an angular ball bearing for a spindle of a machine tool, and FIG. 1 is a cross-sectional view showing the overall configuration of the angular ball bearing, FIG. 2 and FIG. 3 is an enlarged cross-sectional view of a main part showing the outer ring of FIG.

  An angular ball bearing 11 according to the embodiment shown in FIG. 1 includes an inner ring 12 having a raceway surface 12a formed on the outer diameter, and a raceway surface 13a that is disposed on the outer side of the inner ring 12 and that faces the raceway surface 12a of the inner ring 12 on the inner diameter. And a plurality of rolling elements 15 (balls) movably interposed between the raceway surface 12a of the inner ring 12 and the raceway surface 13a of the outer ring 13, and each rolling element 15 in the circumferential direction. The retainer 14 which holds at equal intervals is a main component. In this bearing 11, each rolling element 15 is interposed between the raceway surface 12 a of the inner ring 12 and the raceway surface 13 a of the outer ring 13 with a certain contact angle.

  In this angular ball bearing 11, the counter portion 16 formed close to the raceway surface 13 a of the outer ring 13 as shown in FIG. 2 or 3 so that the inner ring 12, the outer ring 13 and the rolling element 15 have a non-separation structure. , 16 ′ and a design with a tick length t. When assembling the angular ball bearing 11, since the inner ring 12, the outer ring 13, and the rolling element 15 have a non-separation structure because there is a clicking margin t at room temperature, the outer ring 13 is normally thermally expanded. Thus, the outer ring 13 is thermally expanded to facilitate the assembly of the inner ring 12, the outer ring 13 and the rolling element 15.

  The counter units 16 and 16 ′ of each embodiment shown in FIGS. 2 and 3 are adjacent to the raceway surface 13a of the outer ring 13, and are first counter surfaces 16a and 16a ′ that are inclined at a predetermined angle with respect to the axial direction. , Adjacent to the first counter surfaces 16a, 16a ′, and second counter surfaces 16b, 16b ′ having an inclination angle β larger than the inclination angle of the first counter surfaces 16a, 16a ′.

  In the embodiment of FIG. 2, the first counter surface 16a has a flat surface having an inclination angle of 0 ° and parallel to the axial direction as the predetermined angle. Further, in the counter unit 16 ′ in the embodiment of FIG. 3, the inclination angle of the first counter surface 16 a ′ is α. This inclination angle α is an inclination angle necessary for a design having a tick margin t, and is the same as in the prior art. For example, α = 3 ° is preferable. The inclination angle of the first counter surfaces 16 and 16 ′ may be a magnitude equal to or smaller than the above-described inclination angle α as an angle necessary for the design with the click margin t. The axial dimension X of the first counter surface 16, 16 'is preferably 0.5 mm to 5.0 mm. If the axial dimension X is smaller than 0.5 mm, it is difficult to secure a grinding allowance considering the deformation after the heat treatment. If larger than 5.0 mm, an unnecessarily long length is ground. The time will be longer. The axial dimension X increases as the size increases because the grinding allowance varies depending on the bearing size.

  On the other hand, the second counter surfaces 16b and 16b 'in the embodiment of FIGS. 2 and 3 have a larger inclination angle β than the first counter surfaces 16a and 16a'. Since the second counter surfaces 16b and 16b 'do not need to have an inclination angle necessary for a design having a click margin t, for example, β = 4 ° may be set. The inclination angle of the second counter surfaces 16b and 16b 'may be larger than the inclination angle α of the first counter surfaces 16a and 16a' described above.

  In these embodiments, the first counter surfaces 16a and 16a ′ of the counter portions 16 and 16 ′ are polished and managed so as to have an appropriate tick margin t, and the second counter surfaces 16b and 16b ′ are turned. Finish (non-polished). In this embodiment, in order to ensure an appropriate tick length t, the first counter surfaces 16a and 16a, which are part of the counter portions 16 and 16 ', are not polished and finished on the entire surface of the counter portions 16 and 16'. 'Only polishing finish. As a result, it is possible to realize a non-separable bearing having the cricket margin t in the same range as the conventional one.

It is sectional drawing which shows embodiment of the angular ball bearing which concerns on this invention. It is a principal part expanded sectional view which shows an example of the outer ring | wheel of FIG. FIG. 4 is an enlarged cross-sectional view of a main part showing another example of the outer ring in FIG. 1. It is sectional drawing which shows the prior art example of an angular contact ball bearing. It is a principal part expanded sectional view which shows the outer ring | wheel of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Angular contact ball bearing 12 Inner ring 13 Outer ring 14 Cage 15 Rolling element 16 Counter part 16a First counter surface 16b Second counter surface

Claims (3)

  In an angular contact ball bearing in which a plurality of rolling elements rotatably held by a cage are interposed between both raceways of the inner ring and the outer ring with a contact angle, it is close to the raceway of either the inner ring or the outer ring. The counter portion formed as described above is adjacent to the track surface, is inclined at a predetermined angle with respect to the axial direction, is adjacent to the first counter surface, and is formed on the first counter surface. An angular ball bearing comprising a second counter surface having an inclination angle larger than the inclination angle.   The angular ball bearing according to claim 1, wherein the first counter surface is polished.   The angular ball bearing according to claim 1, wherein an inclination angle of the first counter surface is 3 ° or less.

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