JP2008039070A - Angular contact ball bearings - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an angular ball bearing which is made lightweight by reducing the axial dimension of an outer ring and/or an inner ring, and which is prevented from decreasing in removability from the stacked state of an outer-ring assembly and an inner-ring assembly. <P>SOLUTION: The upper surface of the outer ring 2 is positioned axially inward of the end face of the large-diameter annular part 8 of a cage 5 and the outside diameter of the large-diameter annular part 8 side end face of the cage 5 is larger than the inside diameter of the lower surface of the outer ring 2. Chamfered parts 8b, 2d for providing ease of removal from the stacked state of the outer-ring assemblies 6A, 6B are provided, respectively, on the large-diameter annular part 8 side end face of the cage 5 and the lower surface of the outer ring 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an angular contact ball bearing, and more particularly to an angular contact ball bearing combined with a bowl-shaped cage.

  2. Description of the Related Art An angular ball bearing including an outer ring, an inner ring, a plurality of balls arranged between both wheels, and a cage that holds these balls is well known. And as the cage, Patent Document 1 discloses a so-called bowl shape, and the combination of the bowl shape cage and the angular ball bearing is widely used as a preferred embodiment.

  Various rolling bearings are required to be lighter, and it is conceivable that the angular ball bearings can be lightened by reducing the axial dimension of the outer ring and / or inner ring. On the other hand, in the angular ball bearing, in the assembling process, the outer ring assembly or the inner ring assembly may be extracted from below after being stacked in the state of the outer ring assembly or the inner ring assembly.

Fig. 3 shows a stacked state of the outer ring assembly (36A) (36B) in which the ball (34) and the trapezoidal cage (35) are incorporated in the outer ring (32) in the lightened angular ball bearing. Shown in The bowl-shaped cage (35) includes large-diameter and small-diameter annular portions (38) and (39) arranged at predetermined intervals in the axial direction, and both annular portions provided at predetermined intervals in the circumferential direction ( 38) (39) comprising a plurality of inclined column parts (40), and a pair of adjacent column parts (40) and annular parts (38) (39) on both sides thereof. A pocket (41) for accommodating the ball (34) is formed.
JP 2004-52785 A

  According to the angular ball bearing shown in FIG. 3, when the outer ring assembly (36A) is pulled out from the bottom of the stacked outer ring assembly (36A) (36B), the cage (35) of the lower outer ring assembly (36A) is large. There is a problem that the annular portion (38) cannot be pulled out by fitting into the inner diameter of the outer ring (32) of the upper outer ring assembly (36B). Although not shown, the inner ring assembly has the same problem.

  The object of the present invention is to reduce the axial dimension of the outer ring and / or inner ring to reduce the weight of the angular ball bearing using the cage type cage, and to take out the outer ring assembly and the inner ring assembly from the stacked state. It is an object of the present invention to provide an angular ball bearing that prevents deterioration in performance.

  The angular ball bearing according to the first invention includes an outer ring, an inner ring, a plurality of balls arranged between the two rings, and a cage that holds these balls, and the cage is different between one end side and the other end side. In an angular contact ball bearing having an end face with a diameter and being stacked in an outer ring assembly state in which balls and a cage are incorporated in the outer ring, one end face of the outer ring is positioned axially inward from the end face of the larger diameter of the cage In addition, the outer diameter of the large-diameter side end surface of the cage is made larger than the inner diameter of the other end surface of the outer ring, and the outer ring assembly is stacked on at least one of the large-diameter side end surface corner of the cage and the other end surface corner of the outer ring. It is characterized in that a chamfered portion that facilitates removal from below is provided.

  The angular ball bearing according to the second invention includes an outer ring, an inner ring, a plurality of balls arranged between the two rings, and a cage for holding these balls, and the cage is different between one end side and the other end side. In an angular contact ball bearing that has an end face with a diameter and is stacked in an inner ring assembly state in which balls and a cage are incorporated in the inner ring, one end face of the inner ring is positioned axially inward from the end face of the smaller diameter of the cage The inner diameter of the end surface on the small diameter side of the cage is made smaller than the outer diameter of the other end surface of the inner ring, and at least one of the corner portion on the smaller diameter side end surface of the cage and the other end surface corner portion of the inner ring is viewed from below from the stacked state of the inner ring assembly. It is characterized in that a chamfered portion is provided for facilitating the take-out property.

  A cage having end surfaces with different diameters on one end side and the other end side is called a bowl-shaped cage, and includes a large-diameter and small-diameter annular portions arranged at predetermined intervals in the axial direction, and a circumferential portion. And a plurality of inclined column portions that are provided at predetermined intervals in the direction and connect the two annular portions. In the angular ball bearing using this cage, for the purpose of weight reduction, the outer ring axial dimension is reduced (one end surface of the outer ring is positioned axially inward from the end face of the cage) or the inner ring axial dimension is reduced. (Assembled in advance so that one end surface of the inner ring is positioned axially inward of the end surface of the cage) and the outer ring assembly (the ball is mounted on the raceway surface of the outer ring so that it does not fall off with the cage) ) Or inner ring assembly (assembled in advance so that the ball is not dropped by the cage on the raceway surface of the inner ring), and when taking out from the bottom in the next process, the large-diameter annular part of the cage There is a problem that it is difficult to pull out by fitting between the inner diameter of the outer ring and the small-diameter annular portion of the cage.

  The angular ball bearing according to the first aspect of the present invention is improved in the ability to pull out from the stacked state in the outer ring assembly, and the outer diameter of the end face on the large diameter side of the cage is made larger than the inner diameter of the other end face of the outer ring. The large-diameter annular portion of the cage is prevented from being fitted between the inner diameter of the outer ring and the small-diameter annular portion of the cage, and the large-diameter side end face corner of the cage and the other end face corner of the outer ring By providing the chamfered portion on at least one of these, it is easy to take out the outer ring assembly from the bottom in a stacked state.

  One end of the outer ring has a larger diameter than the other end by forming a counterbore, and the end face on the counter-counter side of the outer ring is flush with the end face of the smaller diameter of the cage. The flush surface is the lower surface when stacked. In order to make the outer ring counter-counter side end face and the small-diameter end face of the cage coincide with each other, the small-diameter side of the cage may be made thicker, and the center of the ball in the axial direction is the counter-counter bore of the outer ring. You may make it approach a side end surface. To make the outer diameter of the large-diameter end face of the cage larger than the inner diameter of the other end face (counter-bore side end face) of the outer ring, increase the outer diameter of the large-diameter end face of the cage relative to the standard dimension. Alternatively, the inner diameter of the other end surface of the outer ring may be reduced. The chamfered portion is preferably provided at both the large-diameter side end surface corner of the cage and the other-end surface corner of the outer ring, and the outer diameter of the large-diameter side end surface of the cage and the inner diameter of the other end surface of the outer ring It is preferable to make it as large as possible within a range not exceeding half of the difference (overlapping allowance).

  The angular ball bearing according to the second aspect of the present invention is an improved one from the stacked state in the inner ring assembly, and the inner diameter of the end surface on the small diameter side of the cage is made smaller than the outer diameter of the other end surface of the inner ring. It is prevented that the small-diameter annular portion of the cage fits between the outer diameter of the inner ring and the large-diameter annular portion of the cage, and at least one of the small-diameter side end face corner of the cage and the other end face corner of the inner ring By providing the chamfered portion on the inner ring assembly, it is easy to take out the inner ring assembly from the stacked state.

  One end of the inner ring has a smaller diameter than the other end by forming a counterbore, and the end face on the counter-bore side of the inner ring is flush with the end face of the cage having the larger diameter. One surface is the lower surface when stacked. To make the inner ring counter-bore side end face and the cage's large-diameter end face flush with each other, the cage's large-diameter side may be made thicker, and the ball's axial center should be You may make it approach the counterbore side end surface. To make the inner diameter of the smaller diameter end face of the cage smaller than the outer diameter of the other end face of the inner ring (the counter counter side end face), the inner diameter of the smaller diameter end face of the cage may be made smaller than the standard dimension. The outer diameter of the other end surface of the inner ring may be increased. The chamfered portion is preferably provided at both the small-diameter end face corner of the cage and the other-end face corner of the inner ring, and the difference between the outer diameter of the other end face of the inner ring and the inner diameter of the small-diameter end face of the cage. It is preferable to take as large as possible within a range not exceeding half (overlapping allowance).

  As long as the angular ball bearing is held in a single row in the state of an outer ring assembly or an inner ring assembly, its type (outer ring non-separation type, inner / outer ring separation type, etc.) is not limited. The material of the inner ring and ball is not limited. The cage is formed, for example, by injection molding a synthetic resin such as polyamide or PEEK, but the material and molding method are not limited.

  According to the angular ball bearing of the present invention, it is possible to reduce the weight by reducing the axial dimension of the outer ring or the inner ring, and lower the outer ring assembly or inner ring assembly from the stacked state, which may be deteriorated when the weight is reduced. The take-out property is maintained by the difference in the diameters of the cage and the outer ring or the inner ring at the overlapping surface and the chamfered portion provided at the corner portion on the overlapping surface.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the upper and lower sides refer to the upper and lower sides of the figure.

  FIG. 1 shows an embodiment of an angular ball bearing according to the first invention. Angular contact ball bearings include large-diameter and small-diameter annular portions (8) (9) arranged at predetermined intervals in the axial direction, and both annular portions (8) (9) provided at predetermined intervals in the circumferential direction. ) Is equipped with a bowl-shaped cage (5) consisting of a plurality of inclined column parts (10) that connect them, and the ball (4) and bowl-shaped cage (5) are attached to the outer ring (2). Considering that the outer ring assembly (6A) (6B) is stacked, the one end surface (upper end surface) of the outer ring (2) is the end surface of the large-diameter annular part (8) of the cage (5). The other end face (lower end face) of the outer ring (2) is stacked with the end face (lower end face) of the small-diameter annular portion (9) of the cage (5). It is made to be the same at the time. When the outer ring assembly (6A) (6B) is stacked by making the outer diameter of the large-diameter annular portion (8) of the cage (5) larger than the inner diameter of the lower end surface of the outer ring (2). The outer diameter of the large-diameter annular portion (8) of the cage (5) and the outer ring (2) are between the end surface of the large-diameter annular portion (8) of the cage (5) and the lower end surface of the outer ring (2). An overlap allowance corresponding to half of the difference from the inner diameter of the lower end surface is formed. Furthermore, the end face corner of the large-diameter annular part (8) of the cage (5) and the lower end face corner of the outer ring (2) that are stacked on each other are chamfered for easy removal from the bottom. Parts (8b) and (2d) are provided.

  The outer ring assembly indicated by reference numerals (6A) and (6B) in FIG. 1 is assembled by mounting the balls (4) on the raceway surface (2a) of the outer ring (2) so as not to fall off by the cage (5). Each ball (4) is inserted into each pocket (11) of the cage (5) so that it does not come out.

  The raceway surface of the outer ring (2) is a so-called counterbore, and the diameter of the end (counterbore side end) (2b) corresponding to the large-diameter annular portion (8) of the cage (5) is The diameter is larger than the diameter of the end (counterbore side end) (2c) corresponding to the small-diameter annular portion (9) of (5).

  Compared to the outer ring assembly (36A) (36B) shown in FIG. 3, the outer ring (2) has an end face inner diameter portion of the counter-bore side end (2c) where the end face and the inner diameter face are substantially perpendicular. It is a chamfered portion (2d). For the cage (5), the large diameter annular portion (8a) is added to the conventional large diameter annular portion (38) in which the end surface and the outer diameter surface form a right angle ( 8) is formed, and an end surface outer diameter corner portion of the added maximum diameter portion (8a) is a chamfered portion (8b).

  In the outer ring assembly (6A) (6B) configured in this way, when the outer ring assembly (6A) (6B) are stacked with the counter-bore side end (2c) of the outer ring (2) facing down, The outer ring (2) of the upper outer ring assembly (6B) and the retainer (5) of the lower outer ring assembly (6A) are in contact with each other at the overlapping margin, and the upper outer ring assembly (6B) is slightly tilted from the horizontal. Even if they are stacked slightly off-center with respect to the lower outer ring assembly (6A), the large-diameter annular portion (8) of the cage (5) of the lower outer ring assembly (6A) is the upper outer ring assembly (6B). The inner diameter of the outer ring (2) and the small-diameter annular portion (9) of the cage (5) are not fitted, and the take-out property from the bottom in the stacked state is not hindered. Further, the chamfered portion (8b) (2d) is provided at the corner of the end surface of the large-diameter annular portion (8) of the cage (5) and the corner of the lower end surface of the outer ring (2). The outer ring (2) and the corner of the outer ring (2) do not get caught and can be pulled smoothly.

  FIG. 2 shows an embodiment of the angular ball bearing according to the second invention. Angular contact ball bearings include large- and small-diameter annular portions (18) and (19) arranged at predetermined intervals in the axial direction, and both annular portions (18) and (19) provided at predetermined intervals in the circumferential direction. ) Is provided with a bowl-shaped cage (15) consisting of a plurality of inclined column parts (20) that connect them, and the ball (14) and bowl-shaped cage (15) are attached to the inner ring (13). Considering that the inner ring assembly (7A) and (7B) are stacked, the one end surface (upper end surface) of the inner ring (13) is from the end surface of the small-diameter annular portion (19) of the cage (15). The other end surface (lower end surface) of the inner ring (13) is stacked with the end surface (lower end surface) of the large-diameter annular portion (18) of the cage (15). It is made to be the same at the time. And, when the inner diameter of the inner ring assembly (7A) (7B) is stacked by making the inner diameter of the small-diameter annular portion (19) of the cage (15) smaller than the outer diameter of the lower end surface of the inner ring (13), Between the end surface of the small-diameter annular portion (19) of the cage (15) and the lower end surface of the inner ring (13), the outer diameter of the lower end surface of the inner ring (13) and the small-diameter annular portion (19 of the cage (15)) ), An overlap margin corresponding to half of the difference from the inner diameter is formed. Furthermore, the chamfered portion that facilitates removal from the bottom from the stacked state at the end surface corner portion of the small-diameter annular portion (19) of the cage (15) and the corner portion of the lower end surface of the inner ring (13) that are overlapped with each other. (19b) and (13d) are provided.

  The inner ring assembly indicated by reference numerals (7A) and (7B) in FIG. 2 is assembled by mounting the ball (14) on the raceway surface (13a) of the inner ring (13) so as not to fall off by the cage (15). Each ball (14) is fitted in each pocket (21) of the retainer (15) so that it does not come out.

  The raceway surface of the inner ring (13) is a so-called counter bore, and the diameter of the end (counter bore side end) (13b) corresponding to the small diameter annular portion (19) of the cage (15) is the cage ( The diameter is smaller than the diameter of the end portion (the counter counter side end portion) (13c) corresponding to the large-diameter annular portion (18) of 15).

  Compared to the conventional inner ring assembly, the inner ring (13) has a chamfered portion (13d) at the end surface outer diameter portion of the counter-bore side end portion (13c) where the end surface and the outer diameter surface are substantially perpendicular to each other. ing. And about a cage | basket (15), since the end part and the inner diameter surface make a right angle, the minimum diameter part (19a) is added to the conventional small diameter annular part (39) (refer FIG. 3), and the small diameter annular shape is added. A portion (19) is formed, and an end surface inner diameter corner portion of the added minimum diameter portion (19a) is a chamfered portion (19b).

  In the inner ring assembly (7A) (7B) configured as described above, when the inner ring assemblies (7A) (7B) are stacked with the counter-bore side end (13c) of the inner ring (13) facing down, The inner ring (13) of the upper inner ring assembly (7B) and the cage (15) of the lower inner ring assembly (7A) are in contact with each other at the overlapping portion, and the upper inner ring assembly (7B) is slightly tilted from the horizontal. Even if they are stacked slightly off-center with respect to the lower inner ring assembly (7A), the small-diameter annular portion (19) of the cage (15) of the lower inner ring assembly (7A) remains in the upper inner ring assembly (7B). The inner ring (13) does not fit between the outer diameter of the inner ring (13) and the large-diameter annular portion (18) of the retainer (15), and the take-out property from the bottom in the stacked state is not hindered. Further, the chamfered portions (19b) (13d) are provided at the corners of the end surface corner of the small-diameter annular portion (19) of the cage (15) and the lower end surface of the inner ring (13). The inner ring (13) and the corner of the inner ring (13) do not get stuck and can be pulled out smoothly.

  In the above, the inner ring combined with the outer ring assembly (6A) (6B) and the outer ring combined with the inner ring assembly (7A) (7B) are not shown, but various shapes can be used, and the outer ring assembly ( The outer ring (2) of 6A and 6B and the inner ring (13) of the inner ring assembly (7A) and (7B) can also have shapes other than those illustrated.

FIG. 1 is a longitudinal sectional view showing an embodiment of an angular ball bearing according to the first invention. FIG. 2 is a longitudinal sectional view showing an embodiment of the angular ball bearing according to the second invention. FIG. 3 is a longitudinal sectional view of an angular ball bearing as a comparative example of the angular ball bearing according to the first invention.

Explanation of symbols

(2) Outer ring
(2d) Chamfer
(13) Inner ring
(13d) Chamfer
(4) (14) Ball
(5) (15) Cage
(6A) (6B) Outer ring assembly
(7A) (7B) Inner ring assembly
(8) (18) Large diameter annular part
(8b) Chamfer
(9) (19) Small-diameter annular part
(19b) Chamfer

Claims (2)

The outer ring, the inner ring, a plurality of balls arranged between the two wheels, and a cage for holding these balls, the cage has end faces with different diameters on one end side and the other end side, and the ball and the holding In angular ball bearings in which the vessel is stacked in the outer ring assembly state incorporated in the outer ring,
One end surface of the outer ring is positioned axially inward from the large-diameter end surface of the cage, and the outer diameter of the large-diameter side end surface of the cage is made larger than the inner diameter of the other end surface of the outer ring. An angular contact ball bearing characterized in that a chamfered portion that facilitates removal from the bottom of the outer ring assembly in a stacked state is provided on at least one of the side end face corner and the other end face corner of the outer ring. The outer ring, the inner ring, a plurality of balls arranged between the two wheels, and a cage for holding these balls, the cage has end faces with different diameters on one end side and the other end side, and the ball and the holding Angular contact ball bearings that are stacked in an inner ring assembly where the vessel is built into the inner ring,
One end surface of the inner ring is positioned axially inward from the end surface of the smaller diameter of the cage, and the inner diameter of the smaller diameter side end surface of the cage is made smaller than the outer diameter of the other end surface of the inner ring. An angular contact ball bearing characterized in that a chamfered portion for facilitating the removal from the stacked state of the inner ring assembly is provided in at least one of the other end surface corner portion of the inner ring and the inner ring.

Images