JPH058045U - Angular type ball bearing - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce production costs and improve lubrication performance. [Constitution] A relief portion 11 is provided at a part of a raceway surface of an angular type ball bearing, which is not in contact with the ball 5 in use. The size and shape of the relief portion 11 may be rough, and it is not necessary to polish the surface. Therefore, it becomes easy to manufacture the track on the side having the escape portion 11. Further, the lubricating oil accumulated in the escape portion 11 adheres to the balls 5, so that the lubrication performance of the angular type ball bearing can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of an angular type ball bearing which is mounted on a rotation supporting portion of various mechanical devices to support not only a load in a radial direction but also a load in a thrust direction.

[0002]

[Prior Art]

 For example, when a rotating shaft is rotatably supported inside a housing, and if a load in the thrust direction may be applied to this rotating shaft, angular type ball bearings are widely used to support the rotating shaft. It

The structure of the angular type ball bearing is widely described in various documents such as Japanese Utility Model Laid-Open No. 59-70930. For example, the angular type ball bearing having the structure shown in FIG. 5 has been widely used. Are known.

The angular ball bearing shown in FIG. 5 has an inner ring 2 having an inner ring raceway 1 having an arcuate cross section formed on the outer peripheral surface thereof, and an inner ring 2 arranged around the inner ring 2 concentrically with the inner ring 2. An outer ring 4 having an outer ring raceway 3 having an arcuate section is formed on a surface, and a plurality of balls 5 rotatably provided between the inner ring raceway 1 and the outer ring raceway 3. On the outer peripheral surface of the inner ring 2, shoulder portions 6, 6 are provided on both sides of the inner ring raceway 1, and on the inner peripheral surface of the outer ring 4, one side portion of the outer ring raceway 3 (the right side portion in FIG. 5) is shouldered. Each part 7 is formed.

The plurality of balls 5 are rotatably held by a ring-shaped machined cage 8 made of metal, and the inner peripheral surface of the cage 8 is shoulder portions 6, 6 on the outer peripheral surface of the inner ring 2. The inner ring guide type is located closer to the outer peripheral surface. Since a lubricant such as grease exists between the inner peripheral surface of the retainer 8 and the outer peripheral surfaces of the shoulder portions 6 and 6, the retainer 8 is guided by the inner ring 2 and is retained in the plural Rotate with ball 5.

Such an angular type ball bearing is used in a state where the inner ring 2 is pressed to the right in FIG. 5 and the outer ring 4 is pressed to the left in FIG. 5, as shown by arrows A and B in FIG. To do. As a result, the plurality of balls 5 are brought into relative rotation between the inner ring 2 and the outer ring 4 while abutting on the left side portion of the inner ring raceway 1 and the right side portion of the outer ring raceway 3 (right and left depend on the drawing). Roll along with it. The contact surfaces between the inner ring raceway 1 and the outer ring raceway 3 and the balls 5 are elliptical (contact ellipses) respectively, and the straight line a connecting these contact surfaces is a straight line connecting a plurality of balls 5. It is inclined by an angle α (contact angle) with respect to b.

[0007]

[Problems to be solved by the device]

 By the way, in the case of the conventional angular type ball bearing configured as described above, the work of forming the raceways with the shoulder portions formed on both sides (in FIG. 5, the inner ring raceway 1) is troublesome, and the angular type ball bearings are complicated. It took a long time to produce, and it was also a cause of increasing the production cost.

That is, in the case of the conventional angular type ball bearing, the raceway having the shoulder portions formed on both sides thereof is machined into an accurate dimensional shape over the entire surface thereof, and as shown in FIG. The inner raceway 1 and the outer raceway 3 are polished separately according to the above-mentioned method, so that finishing processing (polishing) such as superfinishing is performed on the entire surface. Since the track with shoulders formed on both sides has a large width and therefore a large area, it is troublesome and time-consuming to machine this track over the entire surface to an accurate size and shape and to polish the entire surface. Inevitably requires. This problem becomes more noticeable in the case of a large angular type ball bearing.

On the other hand, in the angular type ball bearing, the orbits having shoulder portions on both sides thereof do not contact the balls 5 over the entire surface thereof, as is clear from FIG. Only a part (in FIG. 5, the left part of the inner ring raceway 1) contacts the ball 5. Therefore, the remaining portion not in contact with the balls 5 (the right portion of the inner ring raceway 1 in FIG. 5) does not need to be finished, but in the case of the conventional structure, the remaining portion is usually also polished and finished. ..

The angular type ball bearing of the present invention was devised in view of the above circumstances.

[0011]

[Means for Solving the Problems]

 The angular contact ball bearing of the present invention is similar to the above-described conventional angular contact ball bearing, in that the first race having the first raceway having the arcuate cross section on the first peripheral surface and the first race. A second race that is concentrically arranged with the ring and that has a second raceway having an arcuate cross section on the second circumferential face that faces the first circumferential face; and the first raceway and the second raceway. A plurality of balls rotatably provided between the raceway and the raceway are provided, and shoulders are formed on both sides of the first raceway and on one side of the second raceway.

Further, in the angular type ball bearing of the present invention, a part of the first raceway where the plurality of balls do not come into contact with each other when in use is recessed over the entire circumference. The feature is that a relief part is provided so that one side reaches the shoulder part.

[0013]

[Action]

 The angular ball bearing of the present invention configured as described above supports the load bearing in the radial direction and the load bearing in the thrust direction, and at the same time, the member fixing the first bearing ring and the second bearing ring are supported. The action itself when permitting relative rotation with the fixed member is the same as in the case of the conventional angular contact ball bearing described above.

Particularly, in the case of the angular type ball bearing of the present invention, the provision of the relief portion in a part of the first race facilitates the machining of this first race. That is, since there is no contact of balls with the escape portion, the dimensional shape of the escape portion is not required to be strict and the surface does not need to be finished. For this reason, the area of the portion of the first bearing ring that has to be rigorously finished in terms of shape and dimensions, and whose surface is to be finished is narrowed.

[0015]

【Example】

 1 and 2 show a first embodiment of the present invention. The angular contact type ball bearing of the first embodiment has an inner ring 2a having an inner ring raceway 1a having an arcuate cross section on the outer peripheral surface thereof, and the periphery of the inner ring 2a, as in the case of the conventional structure shown in FIG. , An outer ring 4 arranged concentrically with the inner ring 2a and having an outer ring raceway 3 having an arcuate cross-section on the inner peripheral surface, and a plurality of rollably provided between the inner ring raceway 1a and the outer ring raceway 3. It has a ball 5. Then, on the outer peripheral surface of the inner ring 2a, shoulder portions 6, 6 are provided on both sides of the inner ring raceway 1a, and on the inner peripheral surface of the outer ring 4, one side portion of the outer ring raceway 3 (the right side portion in FIG. 1) is shouldered. 7 are formed respectively. Further, the inner peripheral surface of the retainer 8 for rotatably holding the plurality of balls 5 is brought close to the outer peripheral surfaces of the shoulder portions 6, 6 of the outer peripheral surface of the inner ring 2a, and the retainer 8 causes the inner ring to move. While being guided by 2a, it is designed to rotate together with the plurality of balls 5.

In this angular type ball bearing, the inner ring 2a is used while being pressed to the right in FIG. 1 and the outer ring 4 is being pressed to the left in FIG. 1, and the plurality of balls 5 are used in the inner ring raceway 1a. The inner ring 2a and the outer ring 4 are caused to roll relative to each other while being brought into contact with the left side part and the right side part of the outer ring raceway 3 (the left and right sides are as shown in the drawing).

The above-mentioned structure is the same as the above-mentioned conventional structure, but in the case of the angular type ball bearing of the present invention, it is a part of the inner ring raceway 1a formed on the outer peripheral surface of the inner ring 2a. The escape portion 11 is formed by denting the portion where the plurality of balls 5 do not come into contact, that is, the portion on the right side in FIG. 1, over the entire circumference. Then, one side (the right side in FIG. 1) of the escape portion 11 is continuous with the shoulder portion 6 formed on one side of the outer peripheral surface of the inner ring 2a. When using the angular type ball bearing of the present invention, the plurality of balls 5 do not come into contact with the escape portion 11.

When manufacturing the inner ring 2a that constitutes the angular ball bearing of the present invention as described above, the outer ring surface of this inner ring 2a is subjected to turning processing so that the inner ring raceway 1a and the relief portion 11 are formed on this outer surface. Form. In this way, since the turning work of the inner ring raceway 1a and the relief portion 11 is performed by an NC (numerical control) machine tool, the inner ring raceway 1 (on the outer peripheral surface of the inner ring 2 (Fig. 5) constituting the conventional angular contact ball bearing is The processing time is almost the same as that of forming (Fig. 5). Note that the inner ring raceway 1a needs to be accurately sized and shaped like the inner ring raceway 1 in the conventional structure described above, but the accuracy of the dimensional shape of the relief portion 11 need not be so high.

If the inner ring raceway 1a and the clearance portion 11 are formed on the outer peripheral surface of the inner ring 2a as described above, then, as shown in FIG. 2, the surface of the inner ring raceway 1a is covered with the finishing grindstone 9a. Grind. This polishing work is performed only on the surface of the inner ring raceway 1a and not on the surface of the relief portion 11, so that the finishing grindstone 9a is as shown in FIG. 2 (compared to that shown in FIG. 6). A narrow one is enough.

As described above, the angular contact ball bearing of the present invention, which incorporates the inner ring 2a having the relief portion 11 on the outer peripheral surface, supports the load in the radial direction and the load in the thrust direction by the inner ring while supporting the load in the radial direction. The action itself when allowing relative rotation between a member such as a rotary shaft to which 2a is fitted and fixed and a member such as a housing to which the outer ring 4 is fitted and fixed is the same as in the case of the conventional angular contact ball bearing described above. It is the same.

Particularly, in the case of the angular type ball bearing of the present invention, by providing the relief portion 11 in a part of the inner ring track 1a on the outer peripheral surface of the inner ring 2a, the inner ring raceway 1a can be easily processed. .. That is, since the balls 5 do not come into contact with the escape portion 11, the dimensional shape of the escape portion 11 is not required to be strict, and the surface need not be polished. Therefore, the area of the portion of the inner ring raceway 1a that has to be strictly finished in size and whose surface has to be polished is narrowed, so that the inner ring 2a and the angular contact type ball bearing incorporating the inner ring 2a are formed. Production costs can be reduced.

Lubricant oil such as grease collects in the escape portion 11 and the lubricant oil adheres to the surfaces of the plurality of balls 5 as the inner ring 2a and the outer ring 4 rotate relative to each other. Good lubrication of angular type ball bearings. As a result, even when the angular contact ball bearing of the present invention is used under severe conditions, the angular contact ball bearing is less likely to seize or abnormally wear.

For example, as shown in FIG. 3, an oil supply passage 13 for supplying lubricating oil is formed in a spacer 12 sandwiched between a pair of angular type ball bearings, and a passage formed in the inner ring 2a is formed. If one end of the hole 14 is communicated with the oil supply passage 13 and the other end of the through hole 14 is opened to a part of the relief portion 11, a sufficient amount of lubricating oil is stored in the relief portion 11, It is possible to satisfactorily lubricate an angular ball bearing.

Next, FIG. 4 shows a second embodiment of the present invention. In the above-described first embodiment, the shoulder portions 6, 6 (FIG. 1) are formed on both sides of the inner ring track 1a, and the relief portion 11 is formed in a part of the inner ring track 1a. In the case of this embodiment, shoulders 7, 7 are formed on both sides of the outer ring raceway 3a on the inner peripheral surface of the outer ring 4a, and a relief portion 11 is formed in a part of the outer ring raceway 3a (left part in FIG. 4). There is. The shoulder portion 6 on the inner ring 2b side is provided only on one side (the left side in FIG. 4) of the inner ring raceway 1b. Other configurations and operations are the same as those in the case of the first embodiment described above.

[0025]

[Effect of the device]

 Since the angular ball bearing of the present invention is constructed and operates as described above, the manufacturing cost can be reduced and the lubricity can be improved, and an angular ball bearing with good performance can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a polishing operation.

FIG. 3 is a partial cross-sectional view showing an example of a usage state.

FIG. 4 is a partial sectional view showing a second embodiment of the present invention.

FIG. 5 is a partial sectional view showing an example of a conventional structure.

FIG. 6 is a partial cross-sectional view showing a polishing operation.

[Explanation of symbols]

 1 Inner ring raceway 1a Inner ring raceway 1b Inner ring raceway 2 Inner ring 2a Inner ring 2b Inner ring 3 Outer ring raceway 3a Outer ring raceway 4 Outer ring 4a Outer ring 5 Ball 6 Shoulder 7 Shoulder 8 Retainer 9 Finishing grindstone 9a Finishing grindstone 10 Clearance 12 clearance 11 13 Refueling passage 14 Through hole

Claims (1)

[Claims for utility model registration] [Claim 1] A first orbital ring having a first orbital having an arc-shaped cross section formed on a first peripheral surface, and the first orbital ring arranged concentrically with the first orbital ring. A second race that has a second raceway having an arcuate cross-section on the second circumferential face that faces the first circumferential face, and is freely rollable between the first raceway and the second raceway. A plurality of balls provided on the first raceway, and in the angular type ball bearing in which shoulders are formed on both sides of the first raceway and on one side of the second raceway, respectively. An angular contact type ball bearing characterized in that a recessed portion is formed over the entire circumference so that a portion where the plurality of balls do not come into contact with each other during use is provided with one side reaching the shoulder portion.