JP2015113883A - Radial/thrust combination bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust bearing in which the end surface of a second cylindrical flange approaches a rolling surface or projects with respect to the rolling surface, or a combination needle bearing capable of using even the component of the thrust bearing and having high design flexibility.SOLUTION: In a combination needle bearing configured by integrally combining a radial bearing and a thrust bearing, in a buck-up lathe, a diameter is made larger than the outer diameter of a second cylindrical flange, and a recess part made smaller than an inscribed circle of the rolling surface of each thrust needle is provided.

Description

  The present invention relates to an improvement in a combined needle bearing in which a radial bearing and a thrust bearing combined in a rotation support portion of, for example, an automobile transmission are combined.

  For example, a gear arranged around a power transmission shaft to constitute a transmission for an automobile rotates with the power transmission shaft or rotates relative to the power transmission shaft by the action of a synchromesh mechanism ( Or remain stationary regardless of the rotation of the power transmission shaft). In addition, since a helical gear is used as the gear, a thrust load is applied to the gear in addition to the radial load as power is transmitted. Furthermore, since the installation space for the rotation support portion of the automobile transmission is limited, the bearings constituting the rotation support portion need to be small. Under such circumstances, conventionally, a radial needle bearing and a thrust needle bearing have been incorporated between the power transmission shaft and the gear. Further, a radial / thrust combination needle bearing in which these both bearings are combined is also conventionally known, for example, as described in Patent Document 1.

  FIG. 5 shows an example of a conventional structure of a radial / thrust combination needle bearing described in Patent Document 1. The combination needle bearing 1 shown in FIG. 5 is formed by integrally combining a radial bearing 2 and a thrust bearing 3 each of which is a needle bearing. For this purpose, the combination needle bearing 1 includes first and second radial raceways 4 and 5, a plurality of radial needles 6 and 6, a radial cage 7, a first thrust raceway 8, and a backup race. 15, a second thrust race ring 10, a plurality of thrust needles 11, 11, and a thrust cage 12. These constituent members 4, 5, 6, 7, 8, 15, 10, 11, and 12 are combined in a non-separable manner so that necessary portions can be rotated relative to each other. That is, even in a state before the combination needle bearing 1 is incorporated in the rotation support portion, each of the constituent members 4, 5, 6, 7, 8, 15, 10, 11, and 12 is separated from the adjacent members. Is preventing.

  Of the component parts 4, 5, 6, 7, 8, 15, 10, 11, 12, the first and second radial race rings 4, 5 are each formed in a cylindrical shape and arranged concentrically with each other. doing. The first radial raceway 4 of these radial raceways 4 and 5 is integrated with the first thrust raceway 8. That is, at least one surface of a cylindrical material such as case-hardened steel that can be hardened at least by heat treatment, such as a drawn steel pipe made of carbon steel, is oriented perpendicularly to the radially outward direction. It is bent into a ring-shaped portion with an outward flange shape. Of these, the cylindrical portion is the first radial race ring 4, and the annular portion is the first thrust race ring 8. Further, the inner peripheral surface of the first radial raceway ring 4 is an outer raceway raceway 13.

  Further, the other end portion in the axial direction of the cylindrical portion is bent at a right angle inward in the radial direction to form a thrust flange portion 17 having an inward flange shape. Further, the radially outer end portion of the annular portion is bent at a right angle toward the opposite side of the first radial raceway ring 4 in the axial direction to form a short cylindrical tubular flange 9. Further, the first locking portion 18 is formed by bending (projecting) a plurality of circumferential locations (for example, 3 to 4 locations) in the circumferential direction at the tip of the cylindrical flange 9 inward in the radial direction. . The diameter of the inscribed circle of each of the first locking portions 18 is slightly smaller than the outer diameter of the thrust retainer 12.

  On the other hand, the second radial bearing ring 5 is formed by subjecting a material made of an iron-based alloy such as carbon steel (including bearing steel) to be hardened by hardening, such as plastic working such as forging or turning. The whole is processed into a cylindrical shape. In the case of this example, the inner ring raceway 14 is formed in the axially intermediate portion or the other end portion of the outer peripheral surface of the second radial race ring 5. The radial needles 6, 6 have their respective central axes parallel to the central axes of the radial raceways 4, 5 and are held by the radial cage 7, so that the outer ring raceway 13 and the inner ring raceway 14 are held. Between them. In addition, a portion of the outer peripheral surface of the second radial raceway ring 5 that is close to one end in the axial direction and deviated from the inner raceway raceway 14 is recessed radially inward from the inner ring raceway portion 14 as a small diameter step portion 19. Yes. A step surface 20 is provided between the inner ring raceway 14 and the small diameter step portion 19.

  The step surface 20 is opposed to one side surface in the axial direction of the end portion closer to the inner diameter of the backup race 15. The backup race 15 has an annular shape as a whole by a plate material made of an iron-based alloy that can be heat-hardened at least on its surface, such as bearing steel and case-hardened steel. The outer diameter of such a backup race 15 is the same as or slightly smaller than the inner diameter of the cylindrical flange 9. Similarly, the inner diameter is smaller than the outer diameter of the inner ring raceway 14 and larger than the outer diameter of the small diameter step portion 19. In addition, in a state where the backup race 15 and the first thrust raceway ring 8 are overlapped with no gap, the distance between the one side surface in the axial direction of the backup race 15 and the inner side surface of the thrust collar 17 is the second. It is slightly larger than the width (length in the axial direction) of the portion of the radial raceway 5 where the inner raceway 14 is formed. In the case of this example, between the radially inner end of the backup race 15 and the thrust collar 17, the portion of the second radial track ring 5 where the inner ring raceway 14 is formed is disposed on both axial sides. Therefore, relative displacement in the axial direction of the first and second radial race rings 4 and 5 is suppressed by pinching them loosely (with a gap). With this configuration, separation of the constituent members of the radial bearing 2 can be achieved.

  Further, the second thrust race 10 has an L-shaped cross section by punching and bending, for example, by pressing a base plate made of an iron-based alloy that can be hardened at least by heat treatment, such as case-hardened steel. The whole is formed in an annular shape. That is, a short cylindrical second cylindrical shape is formed by bending an end portion closer to the inner diameter of the flat annular portion, which is a main body portion of the second thrust raceway ring 10, toward the first thrust raceway ring 8 at a right angle. A flange 16 is provided. Further, a plurality of circumferential locations (for example, 3 to 4 locations) at the tip of the second cylindrical flange 16 are bent outward (projected) to form the second locking portion 21. ing. The diameter of the circumscribed circle of each of the second locking portions 21 is slightly larger than the inner diameter of the thrust retainer 12.

  The thrust needles 11, 11 have their respective central axes arranged radially (radially) with respect to the thrust bearing rings 8, 10 and are held by the thrust retainer 12. It is provided so that it can roll between 10 axial one side surfaces (thrust track surface) which mutually oppose. In this state, the thrust retainer 12 is prevented from being displaced in a direction away from the first thrust raceway ring 8 by the engagement between the outer peripheral edge of the thrust retainer 12 and the first locking portions 18. . Further, the engagement between the inner peripheral edge of the thrust retainer 12 and each of the second locking portions 21 prevents the second thrust race 10 from being displaced in a direction away from the thrust retainer 12. As a result, separation of the constituent members of the thrust bearing 3 is achieved.

  As described above, the constituent members of the radial bearing 2 are not separated from each other, and the first radial raceway ring 4 constituting the radial bearing 2 and the first thrust raceway ring 8 constituting the thrust bearing 3 are separated. Is one. Therefore, the constituent members 4, 5, 6, 7, 8, 15, 10, 11, and 12 of the combination needle bearing 1 are combined in a non-separable manner with the necessary portions being capable of relative rotation. Therefore, the components 4, 5, 6, 7, 8, 15, 10, 11, 12 of the combination needle bearing 1 must be suppressed before the combination needle bearing 1 is assembled to the rotation support portion. However, these constituent members 4, 5, 6, 7, 8, 15, 10, 11, and 12 are not separated from each other. For this reason, both parts management and assembly work can be simplified, and excellent handling can be achieved.

JP 2012-056766 A

  By the way, when designing a combination needle bearing described in Patent Document 1, if an existing mass production thrust bearing is diverted or a part is diverted for cost reduction, the end face of the second cylindrical flange 16 is used. However, those that are close to the rolling surface or protrude beyond the rolling surface in the axial direction cannot be selected due to interference with the backup race 15, and there is a problem that the degree of freedom in design is impaired.

  In view of the circumstances as described above, the present invention can be used even with a thrust bearing in which the end surface of the second cylindrical flange is close to the rolling surface or protrudes from the rolling surface, or a component thereof. Invented to realize a combination needle bearing with a high degree of design freedom.

The above object of the present invention is achieved by the following configurations.
A radial bearing ring comprising: a cylindrical portion having an outer ring raceway on an inner peripheral surface; and a thrust collar portion bent in a right angle toward the radially inner side at the other axial end portion of the cylindrical portion to form an inward flange shape; ,
A plurality of radial needles rotatably held by a radial holder inside the radial raceway in the radial direction;
An annular portion that is bent at a right angle toward a radially outward portion of the radial raceway in the axial direction and formed into an outward flange shape, and a radially outer end of the annular portion is orthogonally directed toward one axial end side A first thrust raceway ring comprising: a cylindrical flange that is bent into a short cylindrical shape; and a first locking portion that is formed by bending a plurality of circumferential portions of the tip end portion of the cylindrical flange inward in the radial direction;
A ring-shaped backup race provided on one end side in the axial direction of the ring-shaped portion of the first thrust raceway ring;
A flat ring-shaped main body part, a second cylindrical flange formed by bending an end portion closer to the inner diameter of the main body part toward the other end side in the axial direction, and a circumference of a tip part of the second cylindrical flange A second locking ring formed by bending a plurality of directional locations radially outward, and a second thrust raceway ring,
A plurality of thrust needles between the backup race and the second thrust raceway ring and held by a thrust holder so as to roll freely;
In a combined needle bearing with
The backup race is provided with a recess having a diameter larger than an outer diameter of the second cylindrical flange and smaller than an inscribed circle of a rolling surface of each thrust needle. Combination needle bearing.

  According to the combined needle bearing of the present invention, since there is no concern about interference between the second cylindrical flange of the second thrust raceway ring of the thrust bearing and the backup race, it is possible to divert mass-produced products and the like, and there is a degree of freedom in design. Can be increased.

Sectional drawing which shows the 1st example of embodiment of this invention. Sectional drawing which shows the 2nd example of embodiment of this invention. Sectional drawing which shows the 3rd example of embodiment of this invention. Sectional drawing which shows the 4th example of embodiment of this invention. Sectional view showing an example of conventional structure

[First example of embodiment]
FIG. 1 shows a combined needle bearing 1a which is a first example of an embodiment of the present invention in which a thrust bearing 3a having a different structure is used instead of the thrust bearing 3 of the conventional combined needle bearing 1 shown in FIG. ing. More specifically, the combination needle roller bearing 1a is shown in which a unit using a mass-produced product including a plurality of thrust needles 11, 11, a thrust retainer 12a, and a second thrust raceway ring 10a can be used. ing. In addition, the same code | symbol is attached | subjected to the same structure as a conventional structure, and description is simplified.

  The thrust holder 12a is composed of two annular metal plates, and is formed by caulking and coupling the two metal plates in a state where a plurality of thrust needles 11 and 11 are sandwiched. The second thrust raceway ring 10a having the raceway surface of the thrust needles 11 and 11 on one axial end side of the thrust needles 11 and 11 has an axial end near the inner diameter of a flat annular portion that becomes a main body portion. A second cylindrical flange 16a having a short cylindrical shape is provided by bending at a right angle toward the other end side. Further, a plurality of circumferential locations (for example, 3 to 4 locations) at the tip of the second cylindrical flange 16a are bent outwardly (projected) to form a second locking portion 21a. ing. The diameter of the circumscribed circle of each of these second locking portions 21a is slightly larger than the inner diameter of the thrust holder 12a, and the thrust needles 11, 11, the thrust holder 12a, and the second thrust raceway ring 10a Are integrated so that they do not separate.

  As in the conventional structure, a backup race 15 a having a raceway surface of the thrust needles 11, 11 is provided between the first thrust raceway ring 8 and the thrust needles 11, 11 on one end side in the axial direction. Between the radially inner end of 15a and the thrust flange 17, the portion of the second radial race 5 where the inner race 14 is formed is loosened from both sides in the axial direction (with a gap), The relative displacement in the axial direction of the first radial raceway ring 4 and the second radial raceway ring 5 is suppressed. With this configuration, separation of the constituent members of the radial bearing 2 can be achieved.

  Here, the second cylindrical flange 16 a of the second thrust raceway ring 10 a protrudes from the other axial end side of the thrust needle 11. Therefore, interference occurs in the backup race 15 having the conventional configuration. Therefore, the backup race 15a of the present embodiment has a recess 22a formed on one end side in the axial direction near the radially inner periphery so that the second cylindrical flange 16a does not interfere. The outer diameter of the recess 22a is larger than the outer diameter of the second cylindrical flange 16a and smaller than the inscribed circle of the rolling surfaces of the thrust needles 11 and 11. (It is smaller than the raceway surface of the thrust needles 11, 11 provided on the backup race 15 a) The axial depth of the recess is such that the second cylindrical flange 16 a protrudes from the other axial end side of the thrust needle 11. It is deeper than the protruding length.

  By using such a backup race 15a, even if the second cylindrical flange 16a protrudes from the other axial end side of the thrust needle 11, it can be used as a component of the combination needle bearing 1a. Moreover, it is not limited to this structure, Even if it is the thrust holder | retainer 12 used for the combination needle bearing 1 of the prior art shown in FIG. 5, it can be used without a problem. Further, even the unit used in the conventional combination needle bearing 1 shown in FIG. 5 comprising the thrust needles 11, 11, the thrust cage 12, and the second thrust bearing ring 10 can be used without any problem. be able to. In this way, inexpensive mass-produced products can be diverted at the time of design, and the selection range is widened, so that the degree of freedom in design increases.

[Second Example of Embodiment]
FIG. 2 shows a combination needle bearing 1b which is a second example of the embodiment of the present invention. The difference from the first example is that the combination needle bearing 1b of this example does not have the second radial race ring 5, and corresponds to the inner ring raceway 14 of the second radial race ring 5 of the first example of the embodiment. The structure to be provided is provided on the shaft side in which the combination needle bearing 1b of this embodiment is incorporated.

  The thrust flange 17a of the radial bearing 2a differs from the thrust flange 17 of the first example of the embodiment only in the inner diameter. The inner diameter of the thrust collar portion 17a is smaller than the inner diameter of the end surface on the other end side in the axial direction of the radial holder 7 in order to limit the axial movement of the radial holder 7, and each radial needle is used in order to avoid interference with the counterpart shaft. 6 is larger than the inscribed circle of the rolling contact surface.

  Similarly, the backup race 15b differs from the backup race 15a of the first example of the embodiment only in the inner diameter. The inner diameter of the backup race 15b is smaller than the inner diameter of the end face on the other end side in the axial direction of the radial retainer 7 in order to limit the axial movement of the radial retainer 7, and each radial needle 6 in order to avoid interference with the counterpart shaft. The diameter is larger than the inscribed circle of the rolling surface. The backup race 15b is provided with a recess 22b similar to the backup race 15a.

  By adopting such a configuration, the degree of freedom in design can be increased even in a configuration without the second radial race ring 5 as in the first example of the embodiment.

[Third example of embodiment]
FIG. 3 shows a combination needle bearing 1c which is a third example of the embodiment of the present invention. The difference between the configuration of the present embodiment and the configuration of the second example of the embodiment is only the shape of the backup race 15c. A concave portion 22c similar to the backup race 15b is provided on one end side in the axial direction of the backup race 15c, but a convex portion 23a corresponding to the concave portion 22c is provided on the other end side in the axial direction. A part of it is prevented from thinning. Although not shown, in the case of a combination needle bearing having a second radial race, the same effect can be obtained by providing a convex portion on the backup race 15a.

[Fourth Example of Embodiment]
FIG. 4 shows a combination needle bearing 1d which is a fourth example of the embodiment of the present invention. The difference between the configuration of the present embodiment and the configuration of the second example of the embodiment is only the shape of the backup race 15d. The recess 22b of the backup race 15b is provided only on one end side in the axial direction, but in this embodiment, the recesses 22d and 22d are provided on both axial sides of the backup race 15d. Thereby, the directionality of the backup race 15d is lost, and the assemblability is improved. Although not shown, in the case of the combination needle bearing having the second radial raceway, a similar effect can be obtained by providing recesses on both surfaces of the backup race 15a.

  As described above, the combination needle bearing of the present invention does not have to worry about the interference between the second cylindrical flange of the second thrust raceway ring of the thrust bearing and the backup race. Therefore, for example, it can be suitably used as a radial and thrust combination needle bearing incorporated in a rotation support portion of an automobile transmission or the like.

1, 1a, 1b, 1c, 1d Combination needle bearing 2, 2a Radial bearing 3, 3a Thrust bearing 4 First radial bearing ring 5 Second radial bearing ring 6 Radial needle 7 Radial cage 8 First thrust bearing ring 9 Tubular Flange 10, 10a Second thrust raceway ring 11 Thrust needle 12, 12a Thrust retainer 13 Outer raceway 14 Inner ring raceway 15, 15a, 15b, 15c, 15d Backup race 16, 16a Second cylindrical flange 17, 17a Thrust collar 18 First locking portion 19 Small diameter step portion 20 Step surface 21, 21 a Second locking portion 22 a, 22 b, 22 c, 22 d Concavity 23 a Convex portion

Claims (1)

A radial bearing ring comprising: a cylindrical portion having an outer ring raceway on an inner peripheral surface; and a thrust collar portion bent in a right angle toward the radially inner side at the other axial end portion of the cylindrical portion to form an inward flange shape; ,
A plurality of radial needles rotatably held by a radial holder inside the radial raceway in the radial direction;
An annular portion that is bent at a right angle toward a radially outward portion of the radial raceway in the axial direction and formed into an outward flange shape, and a radially outer end of the annular portion is orthogonally directed toward one axial end side A first thrust raceway ring comprising: a cylindrical flange that is bent into a short cylindrical shape; and a first locking portion that is formed by bending a plurality of circumferential portions of the tip end portion of the cylindrical flange inward in the radial direction;
A ring-shaped backup race provided on one end side in the axial direction of the ring-shaped portion of the first thrust raceway ring;
A flat ring-shaped main body part, a second cylindrical flange formed by bending an end portion closer to the inner diameter of the main body part toward the other end side in the axial direction, and a circumference of a tip part of the second cylindrical flange A second locking ring formed by bending a plurality of directional locations radially outward, and a second thrust raceway ring,
A plurality of thrust needles between the backup race and the second thrust raceway ring and held by a thrust holder so as to roll freely;
In a combined needle bearing with
The backup race is provided with a recess having a diameter larger than an outer diameter of the second cylindrical flange and smaller than an inscribed circle of a rolling surface of each thrust needle. Combination needle bearing.

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