JP2013072499A - Angular ball bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce bearing torque by a slight change in a cage shape, in an angular ball bearing having a resin cage.SOLUTION: A small diameter side ball receiving surface 35 and a large diameter side ball receiving surface 37 for determining a position of a ball 40, and a small diameter side recessed place 36 and a large diameter side recessed place 38 further recessed to the outside of a pocket 33 from the ball receiving surfaces 35 and 37, are formed in a small annular part 31 and a large annular part 32 of the resin cage 30, the small diameter side recessed place 36 is linked to the outer race 20 side from an inner diameter surface 31a of the small annular part 31, the small diameter side ball receiving surface 35 is connected with the small diameter side recessed place 36 on the inner race 10 side more than a PCD, and is also linked to an outer diameter surface 31b of the small annular part 31, the large diameter side recessed place 38 is linked to the inner race 10 side from an outer diameter surface 32a of the large annular part 32, and the large diameter side ball receiving surface 37 is connected with the large diameter side recessed place 38 on the outer race 20 side more than the PCD, and is also linked to an inner diameter surface 32b of the large annular part 32, so that the sliding area is reduced from the highest place of a sliding speed and shearing resistance of an oil film by the ball 40 is reduced.

Description

  The present invention relates to an angular ball bearing.

  Conventionally, there is an angular ball bearing provided with a shoulder drop inner ring and a shoulder drop outer ring. As illustrated in FIG. 4, as a resin cage used for this type of angular ball bearing, a small annular portion 3 that fits between a shoulder drop portion of the inner ring 1 and a shoulder portion of the outer ring 2, a shoulder drop portion and an inner ring of the outer ring 2. There are those in which a large annular portion 4 that fits between the shoulder portions of 1 and a window-type pocket 6 in which the small annular portion 3 and the large annular portion 4 are separated by a pillar portion 5 are formed. In order to increase the shoulder portion of the inner ring 1 on the contact angle side, the outer diameter surface of the small annular portion 3 is closer to the pitch diameter of the ball set (hereinafter referred to as PCD) than the inner diameter surface of the small annular portion 3. . Further, in order to increase the shoulder portion of the outer ring 2 on the contact angle side, the inner diameter surface of the large annular portion 4 is closer to the PCD than the outer diameter surface of the large annular portion 4. In general, the pocket 6 is formed in a single spherical shape across the inner and outer diameters of the resin cage (for example, Patent Document 1).

  Recently, bearings for automobiles are required to reduce torque due to environmental problems such as improved fuel consumption. Of the bearing torque, the torque generated between the cage and the ball is mainly composed of oil by the ball and shear resistance of the oil film by the grease. Most of the shear resistance is generated when the oil film formed between the pocket inner surface and the ball is sheared. When the entire inner surface of the pocket 6 is a ball receiving surface that determines the position of the ball 7 as in the conventional example illustrated in FIG. 4, the oil passes through a slight gap between the ball 7 and the ball receiving surface. As a result, resistance is generated, which becomes one of the factors that increase the torque.

  One means for reducing the bearing torque is to form a recess that is further recessed from the ball receiving surface to the outside of the pocket. The pocket clearance set between the ball receiving surface that determines the position of the ball and the ball is sufficiently smaller than the clearance between the recess and the ball (Patent Documents 2 to 4).

  The thing of patent document 2 employ | adopts a recess in a metal waveform holder. The recess is formed with a width in the radial direction and the circumferential direction from the virtual cylindrical surface including the circumference of the PCD. The ball receiving surfaces are formed on the inner diameter side and the outer diameter side of the recess.

  Moreover, the thing of patent document 3 employ | adopts a recess in a metal punching cage. The recess is formed from the inner diameter of the cage to the outer diameter side. The ball receiving surfaces are formed on both sides of the recess in the circumferential direction.

  The thing of patent document 4 employs a recess in a metal press cage. The ball receiving surface runs along the equator of the ball, and the recess forms a wedge-shaped space extending from the ball receiving surface to the inner diameter of the cage and a wedge-shaped space extending from the ball receiving surface to the outer diameter of the cage. It is formed so as to be particularly deeply recessed where it faces the pole.

Japanese Utility Model Publication No. 4-78331 JP 2003-13962 A JP 2006-342901 A JP-A-2-221715

  According to the resin cage of the conventional angular ball bearing illustrated in FIG. 4, an oil film is formed between the ball receiving surface formed on the entire inner surface of the pocket 6 and the ball 7. If a part of the inner surface of the pocket 6 is changed to a recess further recessed toward the outside of the pocket as in Patent Document 2, the shear resistance can be reduced at the recess.

  However, in the case of the resin cage, unlike the metal plate cage, the small annular portion 3 and the large annular portion 4 cannot be plastically deformed to form a recess. As in Patent Documents 2 to 4, when the recess is formed in the vicinity of the PCD, formed over the inner and outer diameters of the cage, or formed over substantially the entire inner and outer diameter of the cage, a resin small ring It becomes difficult to secure the axial thickness of the portion 3 and the large annular portion 4 particularly in the vicinity of the PCD, which requires a significant change in the cage shape.

  Therefore, the problem to be solved by the present invention is to reduce the bearing torque by changing the shape of the cage slightly in the angular ball bearing provided with the resin cage.

  To achieve the above object, the present invention includes a shoulder drop inner ring, a shoulder drop outer ring, and a resin retainer, and the resin retainer is provided between a shoulder drop portion of the inner ring and a shoulder portion of the outer ring. A small annular portion that fits between the shoulder drop portion of the outer ring and a shoulder portion of the inner ring, and the outer diameter surface of the small annular portion is larger than the inner diameter surface of the small annular portion. In the angular ball bearing close to the pitch diameter of the ball set, the inner ring surface of the large annular part is closer to the pitch diameter than the outer diameter surface of the large annular part, the small annular part is the position of the ball in the pocket A small-diameter side ball receiving surface and a small-diameter side recess further recessed from the ball receiving surface toward the outside of the pocket, and the large annular portion includes a large-diameter side ball receiving surface that determines the position of the ball, and A large-diameter side recess further recessed from the ball receiving surface to the outside of the pocket, and the small-diameter side concave Is connected from the inner diameter surface of the small annular part to the outer ring side, and the small diameter side ball receiving surface is connected to the small diameter side recess on the inner ring side of the pitch diameter and is connected to the outer diameter surface of the small annular part. The large diameter side recess is continuous from the outer diameter surface of the large annular portion to the inner ring side, the large diameter side ball receiving surface is connected to the large diameter side recess on the outer ring side than the pitch diameter, and The structure which continued to the internal-diameter surface of the said large annular part was employ | adopted.

  The shear resistance due to balls is generally determined by F = η (u / h) S. Here, F: shear resistance, η: viscosity of oil, u: sliding speed, h: oil film thickness, S: sliding area. As the ball rotates, the circumferential speed of the ball rotation increases as the ball rotates away from the pitch diameter (PCD) of the ball set when the ball rotates, and the sliding speed increases. The outer diameter surface of the small annular portion is closer to the PCD than the inner diameter surface of the small annular portion, and the inner diameter surface of the large annular portion is closer to the PCD than the outer diameter surface of the large annular portion. The sliding speed can be the fastest at the outer diameter surface of the part. By forming recesses that are further recessed from the inner diameter surface of the small annular portion and the outer diameter surface of the large annular portion to the outside of the pocket, the clearance between the balls from the place where the peripheral speed of the ball rotation is fastest is further expanded from the pocket. The shear resistance can be reduced most effectively. Further, the small-diameter side recess and the large-diameter side recess can widen the opening to the pocket and reduce the resistance when the lubricant passes through the pocket. Also, by reducing the area of the ball receiving surface by forming the small diameter side recess and the large diameter side recess, the amount of oil film formed between the ball and the inside of the pocket is reduced, and the ball is against the resin cage The amount of oil film that shears during movement can also be reduced. These reductions can reduce the bearing torque. By forming a recess in both the small annular portion and the large annular portion, the radial depth of the small diameter side recess and the large diameter side recess can be reduced. Further, when the small diameter side ball receiving surface is connected to the small diameter side recess on the inner ring side of the PCD and connected to the outer diameter surface of the small annular portion, the small annular portion is located where the sliding speed including the vicinity of the PCD becomes relatively slow. Since the axial thickness of the part can be ensured as before, it is possible to change the shape of a small small annular part. Similarly, if the large-diameter side ball receiving surface is connected to the large-diameter side recess on the outer ring side of the PCD and connected to the inner diameter surface of the large annular portion, it is possible to keep the slight change in the shape of the large annular portion.

  The inner diameter surface of the small annular portion is smaller than the shoulder outer diameter of the inner ring, the outer diameter surface of the large annular portion is larger than the shoulder inner diameter of the outer ring, and the small diameter side recess is the Preferably, the inner ring is formed at a smaller diameter than the shoulder outer diameter, and the large diameter side recess is formed at a diameter larger than the shoulder inner diameter of the outer ring. Small annular part using the annular space between the shoulder of the inner ring and the shoulder of the outer ring while taking the depth of the small diameter side recess and large diameter side recess using the shoulder drop space And the wall thickness of a macrocyclic part can be ensured over a perimeter.

  The difference between the inner and outer diameters of the small annular part is preferably larger than the inner and outer diameter difference of the large annular part. In order to ensure the strength of the small annular part, which is difficult to ensure the strength compared to the large annular part, the inner and outer diameter differences are increased on the small annular part side. This type of resin retainer is suitable for the present invention because the radial depth of the small-diameter side recess is hardly limited.

  It is also preferable that the inner diameter surface of the small annular portion is wider than the outer diameter surface of the large annular portion and extends in the circumferential direction. In order to secure the strength of the small annular portion, which is difficult to ensure the strength as compared with the large annular portion, the inner diameter width of the small annular portion is made larger than the outer diameter surface of the large annular portion in the circumferential direction. This type of resin retainer is suitable for the present invention because the axial depth of the small-diameter side recess is hardly limited.

  For example, the small-diameter side ball receiving surface and the large-diameter side ball receiving surface can each be formed in a spherical shape. The present invention can be implemented only by forming a small-diameter side recess and a large-diameter side recess from a conventional product having the most common ball receiving surface shape. In the present invention, each of the small-diameter side ball receiving surface and the large-diameter ball receiving surface is a pocket inner surface portion that can come into contact with the ball to determine the position of the ball relative to the resin cage during the bearing operation. As long as it can be achieved, it can be any shape from a single or multiple faces.

  For example, the resin holder can be formed by injection molding. Since the small diameter side recess and the large diameter side recess are recessed from the inner diameter surface of the small annular portion and the outer diameter surface of the large annular portion, they can be formed simultaneously when molding the small annular portion and the large annular portion.

  Since the small diameter side recess and the large diameter side recess are recessed from the inner diameter surface of the small annular portion and the outer diameter surface of the large annular portion, they can also be formed by shaving. According to the shaving process, the present invention can be applied to a conventional product in which the outer diameter of the small annular portion is larger than the inner diameter of the large annular portion.

  The resin cage is preferably formed of polyphenylene sulfide (PPS) resin. PPS is particularly excellent in mechanical strength among resins that can be injection-molded or machined, and thus is suitable for forming a small-diameter side recess and a large-diameter side recess.

  The resin cage according to the present invention can reduce the bearing torque by substituting the conventional product.

  The angular contact ball bearing according to the present invention can improve fuel consumption by being used for supporting the rotation shaft of the transmission.

  As described above, according to the present invention, in the angular ball bearing provided with a resin cage, by adopting the above-described configuration, the shear resistance and the like at a relatively high sliding speed in the small diameter side recess and the large diameter side recess can be obtained. Effectively reducing the axial thickness of the small and large annular parts in the vicinity of the PCD where the sliding speed is relatively slow, so the bearing torque can be reduced by a slight change in the cage shape. it can.

Sectional view of angular contact ball bearing according to the embodiment Partial enlarged view of the small-diameter side recess in FIG. Schematic diagram showing the overall configuration of a transmission incorporating the angular ball bearing of FIG. Cross section of conventional example

  An angular ball bearing according to an embodiment of the present invention will be described with reference to FIG. As shown in the figure, this angular ball bearing includes a shoulder drop inner ring 10, a shoulder drop outer ring 20, and a resin retainer 30. FIG. 1 shows a cross section including the center of the ball 40 equally distributed in the bearing central axis and the circumferential direction in a state where the pocket clearance is uniform on both sides in the circumferential direction, the axial direction and the radial direction. . In the present invention, the axial direction refers to a direction along the bearing central axis. Further, the radial direction means a direction perpendicular to the axial direction. The circumferential direction means a circumferential direction around the bearing central axis.

  The inner ring 10 and the outer ring 20 are single-row, single-shoulder raceways. The resin retainer 30 includes a small annular part 31 that fits in an annular space between the shoulder drop part 11 of the inner ring 10 and the shoulder part 21 of the outer ring 20, and between the shoulder drop part 22 of the outer ring 20 and the shoulder part 12 of the inner ring 10. A large annular portion 32 that fits in the annular space, and a column portion 34 that divides the small annular portion 31 and the large annular portion 32 into a window-shaped pocket 33. The shoulder drop portion 11 is composed of an outer peripheral surface portion located on the side opposite the shoulder portion 12 from the raceway groove 13. The shoulder drop portion 22 is composed of an inner peripheral surface portion located on the side opposite the shoulder portion 21 from the raceway groove 23. The cage central axis of the resin cage 30 is coaxial with the bearing central axis.

  The resin cage 30 is a rolling element guide system, and a gap is provided between the inner ring 10 and the outer ring 20. The small annular portion 31 has a small diameter side ball receiving surface 35 that determines the position of the ball 40 that has entered the pocket 33, and a small diameter side recess 36 that is further recessed from the small diameter side ball receiving surface 35 to the outside of the pocket 33. . The large annular portion 32 has a large-diameter side ball receiving surface 37 that defines the position of the ball 40 and a large-diameter side recess 38 that is further recessed from the large-diameter side ball receiving surface 37 to the outside of the pocket 33. The pocket 33 refers to a space that can be occupied by the ball 40.

  The small diameter side recess 36 is continued from the inner diameter surface 31 a of the small annular portion 31 to the outer ring 20 side. The small-diameter side ball receiving surface 35 is connected to the small-diameter side recess 36 on the inner ring 10 side with respect to the PCD, and is connected to the outer-diameter surface 31 b of the small annular portion 31. PCD refers to the diameter of a circle including the center of one row of balls 40 held by the resin holder 30. The large diameter side recess 38 is continuous from the outer diameter surface 32a of the large annular portion 32 to the inner ring 10 side. The large-diameter ball receiving surface 37 is connected to the large-diameter recess 38 on the outer ring 20 side of the PCD and continues to the inner diameter surface 32 b of the large annular portion 32.

  The inner diameter surface 31a of the small annular portion 31 and the outer diameter surface 32a of the large annular portion 32 are formed along the cylindrical surface, respectively, and have a surface shape coaxial with the cage central axis. The outer diameter surface 31b of the small annular portion 31 and the inner diameter surface 32b of the large annular portion 32 are formed along a conical surface coaxial with the bearing central axis. The outer diameter surface 31 b of the small annular portion 31 has a conical large end on the large annular portion 32 side, and the entire outer diameter surface 31 b is closer to the PCD than the inner diameter surface 31 a of the small annular portion 31. It has become. An inner diameter surface 32b of the large annular portion 32 has a conical small end on the small annular portion 31 side, and the entire inner diameter surface 32b has a diameter closer to the PCD than the outer diameter surface 32a of the large annular portion 32. It has become. The outer diameter surface 31b of the small annular portion 31 and the inner diameter surface 32b of the large annular portion 32 are not limited to a conical surface shape, and may be a cylindrical surface shape, for example. The inner diameter surface 31a of the small annular portion 31 and the outer diameter surface 32a of the large annular portion 32 are narrower than the outer diameter surface 31b and the inner diameter surface 32b with the formation of the small diameter side recess 36 and the large diameter side recess 38. It extends in the circumferential direction.

  The small-diameter side ball receiving surface 35 and the large-diameter side ball receiving surface 37 are composed of surface portions of a small annular portion 31 and a large annular portion 32 that can contact the ball 40 at least in the axial direction. Since the resin cage 30 in the illustrated example is a rolling element guide system, the small-diameter side ball receiving surface 35 and the large-diameter side ball receiving surface 37 are formed in a surface shape along the surface of the ball 40, and It also serves as a part for determining the radial position. The small-diameter-side ball receiving surface 35 and the large-diameter-side ball receiving surface 37 are arranged such that locations where they can come into contact with the balls 40 in the axial direction due to relative radial displacement of the resin retainer 30 are the outer diameter side edge and the inner diameter side edge. Is displaced in the radial direction. The positions of the balls 40 that are radially directed toward the outer ring 20 with respect to the resin retainer 30 are the outer diameter side edge of the small diameter side ball receiving surface 35 that intersects the outer diameter surface 31 b of the small annular portion 31, and the large annular portion 32. It is determined by contact with the outer diameter side edge portion of the large diameter side ball receiving surface 37 that intersects the outer diameter surface 32a. The positions of the balls 40 that are radially directed toward the inner ring 10 with respect to the resin retainer 30 are the inner diameter side edge of the small diameter ball receiving surface 35 that intersects the inner diameter surface 31 a of the small annular portion 31 and the inner diameter of the large annular portion 32. It is determined by contact with the inner diameter side edge of the large diameter side ball receiving surface 37 that intersects the surface 32b.

  The surface shapes of the small-diameter side ball receiving surface 35 and the large-diameter side ball receiving surface 37 are spherical. Since this spherical shape is adopted in a known rolling element guide type resin retainer, there is no need to change the setting of the pocket clearance when applying the present invention.

  Since only a pocket clearance is secured between the small-diameter side ball receiving surface 35, the large-diameter side ball receiving surface 37, and the ball 40, between the ball receiving surfaces 35, 37 and the ball 40 during the bearing operation. An oil film is formed in the gap, and shear resistance is generated in which the balls 40 shear the oil film up to the gap between them. Therefore, the oil film is formed by an appropriate lubricant (fluid) such as lubricating oil or grease. The slip area S corresponds to an area in a range in which the small diameter side ball receiving surface 35, the large diameter side ball receiving surface 37, and the ball 40 face each other in the axial direction. Between the small-diameter side recess 36 and the large-diameter side recess 38 and the ball 40, there is a sufficiently larger clearance than the small-diameter side ball receiving surface 35 and the large-diameter side ball receiving surface 37. Then, the shear resistance of the oil by the ball 40 does not become a problem. By forming the small-diameter side recess 36 and the large-diameter side recess 38, the small-diameter side ball receiving surface 35 and the large-diameter side ball receiving surface 37 are connected to the inner diameter surface 31a of the small annular portion 31 and the outer diameter surface 32a of the large annular portion 32. The sliding area S and the amount of oil film are reduced compared to the case where the same diameter is formed.

  Further, the outer diameter side edge portion of the small diameter side ball receiving surface 35 is relatively close to the PCD, and the inner diameter side edge portion of the small diameter side ball receiving surface 35 is relatively far from the PCD. The inner diameter side edge of the large diameter side ball receiving surface 37 is relatively close to the PCD, and the outer diameter side edge of the same ball receiving surface 37 is relatively far from the PCD. The small diameter side ball receiving surface 35 will be described as an example. As shown in FIG. 2, when the ball 40 rotates during rotation of the bearing, the ball 40 facing the outer diameter side edge of the small diameter side ball receiving surface 35 in the axial direction. Comparing the ball rotation speed at the portion and the ball rotation speed at the ball 40 portion facing the inner diameter side edge of the small diameter side ball receiving surface 35 in the axial direction, the diameter of the outer diameter side edge portion and the PCD Since the difference a <the diameter difference b between the inner diameter side edge and the PCD, the ball rotation speed on the inner diameter side edge becomes higher. The sliding speed u is determined based on these ball rotation peripheral speeds. The ball rotation peripheral speed at the portion of the ball 40 facing the inner diameter surface 31a of the small annular portion 31 in the axial direction becomes higher than the ball rotation peripheral speed on the inner diameter side edge side. Compared with the case where the small diameter side ball receiving surface 35 is formed to the same diameter as the inner diameter surface 31a by denting the small diameter side recess 36 from the inner diameter surface 31a of the small annular portion 31 in the radial direction, the sliding speed u is the highest. The shear resistance of the oil film is reduced from the high region. Of course, the same reduction effect can be obtained by forming the large-diameter side recess 38 shown in FIG.

  As the small diameter side recess 36 and the large diameter side recess 38 are deepened in the radial direction, the shear resistance can be reduced. By reducing the shear resistance on both axial sides of the ball 40, the radial depth and axial depth of the small-diameter side recess 36 and the large-diameter side recess 38 are reduced, and the resin small annular portion 31 and the large Ensuring the strength of the annular portion 32 is facilitated.

  The inner diameter surface 31 a of the small annular portion 31 has a smaller diameter than the outer diameter of the shoulder portion 12 of the inner ring 10. The outer diameter surface 32 a of the large annular portion 32 has a larger diameter than the inner diameter of the shoulder portion 21 of the outer ring 20. An annular space having a smaller diameter than the outer diameter of the shoulder portion 12 exists on the shoulder dropping portion 11 of the inner ring 10. An annular space having a diameter larger than the inner diameter of the shoulder portion 21 exists on the shoulder dropping portion 22 of the outer ring 20. Using these annular spaces, the depth of the small diameter side recess 36 and the large diameter side recess 38 can be taken in the radial direction. The small-diameter side recess 36 is formed at a smaller diameter than the outer diameter of the shoulder 12 of the inner ring 10. For this reason, the circumferential portion of the small annular portion 31 has a sufficient diameter in the circumferential direction using the annular space existing on the large diameter side from the outer diameter of the shoulder portion 12 of the inner ring 10. Secured in the direction thickness. The large-diameter side recess 38 is formed at a diameter larger than the inner diameter of the shoulder portion 21 of the outer ring 20. For this reason, the circumferential portion of the large annular portion 32 has a sufficient thickness in the circumferential direction using the annular space existing on the small diameter side from the inner diameter of the shoulder portion 21 of the outer ring 20. Secured.

  The difference between the inner and outer diameters of the small annular portion 31 is larger than the inner and outer diameter difference of the large annular portion 32. The difference between the inner and outer diameters of the small annular portion 31 corresponds to the maximum radial width of the small annular portion 31, and in the illustrated example, the difference between the outer diameter of the large end portion of the outer diameter surface 31b and the inner diameter of the inner diameter surface 31a. is there. The difference between the inner and outer diameters of the large annular portion 32 corresponds to the maximum radial width of the large annular portion 32. In the illustrated example, the difference between the outer diameter of the outer diameter surface 32a and the inner diameter of the small end portion of the inner diameter surface 32b. . Compared with the large annular portion 32, the radial width of the small annular portion 31 whose inner and outer diameters are small and it is difficult to ensure the strength is relatively large, and the radial depth of the small diameter side recess 36 is large. Is more restrictive than it is.

  Similarly, in order to obtain the strength of the small annular portion 31, the inner diameter surface 31 a of the small annular portion 31 is wider than the outer diameter surface 32 a of the large annular portion 32 and extends in the circumferential direction. The width of the portion of the small annular portion 31 in the circumferential direction is made relatively large, and the radial depth of the small diameter side recess 36 is prevented from being limited more than that of the large diameter side recess 38.

  The formation range of the small-diameter side recess 36 and the large-diameter side recess 38 remains on both sides in the axial direction of the pocket 33 and gives priority to the strength of the column part 34. It is formed by removing from the column part 34. In addition, although the radial direction depth and the axial direction depth of the small diameter side recess 36 and the large diameter side recess 38 are the same, it is not limited to this. Since the outer diameter surface 32a of the large annular portion 32 is closer to the PCD than the inner diameter surface 31a of the small annular portion 31, the large diameter side recess 38 can be made relatively shallow in the radial direction.

  The resin holder is formed by injection molding. Since the resin retainer 30 is injection-molded with a two-part mold in the axial direction, the outer diameter of the small annular portion 31 is smaller than the inner diameter of the large annular portion 32. The small-diameter-side ball receiving surface 35, the small-diameter-side recess 36, and the small annular portion 31 as a whole do not have a portion that is undercut toward the large annular portion 32 in the axial direction. The large-diameter-side ball receiving surface 37, the large-diameter-side recess 38, and the entire large annular portion 32 do not have a portion that is undercut toward the small annular portion 31 in the axial direction.

  The small-diameter side recess 36 and the large-diameter side recess 38 can also be formed by machining.

  The resin holder 30 can be formed of polyphenylene sulfide (PPS) resin. The resin holder 30 can also be formed of other super engineering ring plastic. Since PPS is particularly excellent in mechanical strength among super engineering rearing plastics, the strength of the small annular portion 31 and the large annular portion 32 is ensured while forming the small diameter side recess 36 and the large diameter side recess 38. It is suitable for.

  Since the angular ball bearing has the small-diameter side recess 36 and the large-diameter side recess 38 as described above, the shear resistance can be most effectively lowered from the place where the ball rotation speed is fastest. Moreover, the small diameter side recess 36 and the large diameter side recess 38 can widen the opening to the pocket 33 and reduce the resistance when the lubricant passes through the pocket 33. Further, the formation of the small-diameter side recess 36 and the large-diameter side recess 38 reduces the area of the small-diameter side ball receiving surface 35 and the large-diameter side ball receiving surface 37, thereby forming the ball 40 and the inside of the pocket 33. The amount of oil film that is sheared when the ball 40 moves relative to the resin holder 30 can also be reduced. These reductions can reduce the bearing torque. By forming the small-diameter side recess 36 and the large-diameter side recess 38 in the small annular portion 31 and the large annular portion 32, the radial depth is made shallower than when the same bearing torque reduction effect is obtained only by forming the concave portion on one side. can do. Further, the small-diameter side ball receiving surface 35 and the large-diameter side ball receiving surface 37 are connected to the small-diameter side recess 36 and the large-diameter side recess 38 on the inner ring 10 side and the outer ring 20 side of the PCD, and outside the small annular portion 31. By connecting the radial surface 31b to the inner diameter surface 32b of the large annular portion 32, the axial thickness of the small annular portion 31 and the large annular portion 32 is ensured at a relatively slow sliding speed including the vicinity of the PCD. The shape of the small annular portion 31 and the large annular portion 32 can be changed.

  FIG. 3 schematically shows the overall configuration of a transmission that uses the angular ball bearing according to the above-described embodiment to support a rotating shaft. The transmission 100 is for an automobile using the angular ball bearing 110 according to the embodiment, and includes a first rotating shaft 120 to which the power of the engine 200 is transmitted via a clutch, and a first rotating shaft 120 that transmits this power to the wheels. 2 rotation shafts 130. A plurality of transmission gears 121 to 125 and 131 to 135 are attached to the rotary shafts 120 and 130, respectively, and both ends are the transmission shafts supported by the angular ball bearings 110. By reducing the torque of the angular ball bearing 110, the torque of the rotating shafts 120 and 130 can be reduced and the fuel efficiency can be improved.

  The technical scope of the present invention is not limited to the above-described embodiments, but includes all modifications within the scope of the technical idea based on the description of the scope of claims.

DESCRIPTION OF SYMBOLS 10 Inner ring | wheel 11,22 Shoulder drop part 12,21 Shoulder part 13,23 Track groove 20 Outer ring 30 Resin holder 31 Small annular part 31a, 32b Inner diameter surface 31b, 32a Outer diameter surface 32 Large annular part 33 Pocket 34 Column part 35 Small diameter Side ball receiving surface 36 Small diameter side recess 37 Large diameter side ball receiving surface 38 Large diameter side recess 40 Ball 100 Transmission 110 Angular ball bearing 120 130 Rotating shaft PCD Ball set pitch diameter

Claims (10)

A shoulder drop inner ring (10), a shoulder drop outer ring (20), and a resin retainer (30);
The resin retainer (30) includes a small annular part (31) that fits between a shoulder drop part (11) of the inner ring (10) and a shoulder part (21) of the outer ring (20), and the outer ring (20 ) Having a large annular portion (32) that fits between the shoulder drop portion (22) and the shoulder portion (12) of the inner ring (10),
The outer diameter surface (31b) of the small annular portion (31) is closer to the pitch diameter (PCD) of the ball set than the inner diameter surface (31a) of the small annular portion (31), and the large annular portion (32). In the angular ball bearing, the inner diameter surface (32b) is closer to the pitch diameter (PCD) than the outer diameter surface (32a) of the large annular portion (32).
The small annular portion (31) is further recessed from the ball receiving surface (35) to the outside of the pocket (33) from the small diameter side ball receiving surface (35) for determining the position of the ball (40) entering the pocket (33). The large annular portion (32) has a small diameter side recess (36), and the large diameter side ball receiving surface (37) for determining the position of the ball (40) and the ball receiving surface (37). The pocket (33) has a large-diameter side recess (38) further recessed to the outside,
The small diameter side recess (36) is continuous from the inner diameter surface (31a) of the small annular portion (31) to the outer ring (20) side, and the small diameter side ball receiving surface (35) is formed from the pitch diameter (PCD). Is connected to the small-diameter side recess (36) on the inner ring (10) side, and continues to the outer diameter surface (31b) of the small annular portion (31),
The large diameter side recess (38) continues from the outer diameter surface (32a) of the large annular portion (32) to the inner ring (10) side, and the large diameter side ball receiving surface (37) has the pitch diameter ( An angular contact ball bearing characterized in that it is connected to the large-diameter side recess (38) on the outer ring (20) side of the PCD) and to the inner diameter surface (32b) of the large annular portion (32).   An inner diameter surface (31a) of the small annular portion (31) is smaller in diameter than a shoulder portion (12) outer diameter of the inner ring (10), and an outer diameter surface (32a) of the large annular portion (32) is the outer ring. The shoulder (21) of (20) has a larger diameter than the inner diameter, and the small-diameter side recess (36) is formed at a diameter smaller than the outer diameter of the shoulder (12) of the inner ring (10). The angular ball bearing according to claim 1, wherein the radial recess (38) is formed at a diameter larger than the inner diameter of the shoulder (21) of the outer ring (20).   The angular ball bearing according to claim 1 or 2, wherein a difference in inner and outer diameters of the small annular part (31) is larger than an inner and outer diameter difference of the large annular part (32).   The inner diameter surface (31a) of the small annular portion (31) is wider than the outer diameter surface (32a) of the large annular portion (32) and extends in the circumferential direction. Angular contact ball bearing described.   The angular ball bearing according to any one of claims 1 to 4, wherein the small-diameter side ball receiving surface (35) and the large-diameter side ball receiving surface (37) are each formed in a spherical shape.   The angular contact ball bearing according to any one of claims 1 to 5, wherein the resin retainer (30) is formed by injection molding.   The angular ball bearing according to any one of claims 1 to 5, wherein each of the small-diameter side recess (36) and the large-diameter side recess (38) is formed by machining.   The angular contact ball bearing according to any one of claims 1 to 7, wherein the resin cage (30) is made of polyphenylene sulfide (PPS) resin.   The resin holder according to any one of claims 1 to 8.   The transmission which used the angular ball bearing (110) of any one of Claim 1 to 8 for support of a rotating shaft (120,130).

Images