JP3669716B2 - Method for manufacturing outer ring for shell type needle bearing - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method for manufacturing an outer ring for a shell-type needle bearing that is incorporated in a radial rotation support portion that is often subjected to a relatively thrust force, such as a car cooler compressor, a suspension for a two-wheeled vehicle, and a steering gear.
[0002]
[Prior art]
For example, since a large radial load is applied to the rotor of a car cooler compressor, the rotor is rotatably supported by a needle bearing (not a ball bearing). Further, since not only a radial load but also a thrust force is applied to the rotor, the needle bearing needs to have a structure that prevents the raceway surface and the needle from being displaced based on the thrust load. is there. For this reason, conventionally, a rotational support portion such as the rotor has been constituted by a shell type needle bearing as shown in FIGS.
[0003]
First, in the structure of the first example shown in FIG. 14, both ends of the outer ring 1 which is formed into a cylindrical shape by bending a metal plate are bent at right angles toward the inside in the diameter direction (vertical direction in FIG. 14). Thus, a pair of holding portions 2 and 2 are formed. And the axial direction (left-right direction of FIG. 14) both end surfaces of the holder | retainer 4 which hold | maintains the some needle 3 so that rolling is possible, and the inner surface of each said holding | suppressing part 2 and 2 are adjoined. When a thrust force is applied to the rotation support portion incorporating such a shell type needle bearing, the axial end edge of the retainer 4 and the inner side surface of one of the restraining portions 2 are in sliding contact with each other, and the outer ring 1 and needle 3 are prevented from shifting.
[0004]
Further, in the structure of the second example shown in FIGS. 15 to 16, both end edges in the axial direction (left and right direction in FIG. 15) of the outer ring 1a which is formed into a cylindrical shape as a whole by bending a metal plate are respectively in the diameter direction. (Up and down direction in FIG. 15) Folded portions 5a and 5b are formed by folding back 180 degrees inward. The end edges of the folded portions 5a and 5b are directly opposed to the end surfaces 3a and 3a of the needle 3, respectively. In the case of the conventional structure, the end edges 6 and 6 of the folded portions 5a and 5b are formed at right angles as shown in FIGS. A holder 4 that holds a plurality of needles 3 so as to roll freely is inserted inside each of the folded portions 5a and 5b. When a thrust force is applied to the rotation support portion in which such a shell type needle bearing is incorporated, the axial end surfaces 3a and 3a of the needles 3 and the end edges 6 and 6 of any of the folded portions 5a and 5b are provided. Prevents the outer ring 1 and the needle 3 from shifting.
[0005]
[Problems to be solved by the invention]
However, in the case of the conventional shell type needle bearing configured as described above, when rotating while receiving a force in the thrust direction, not only the frictional resistance is increased and the power loss is increased, but also the seizure occurs in a remarkable case. There is a problem that needs to be solved.
[0006]
That is, when rotating while receiving a force in the thrust direction, in the structure of the first example shown in FIG. 14, the one end edge of the cage 4 and the inner side surface of one of the holding portions 2 are the same as those in FIGS. In the structure of the second example shown in FIG. 5, the end surface 3a of each needle 3 and the end edge 6 of any folded portion 5a (or 5b) are rubbed with each other. This frictional component becomes a power loss, which deteriorates the performance of the mechanical device incorporating the shell type needle bearing. Furthermore, if the thrust force is large and the rotational speed is high, it may cause seizing.
[0007]
In JP-A-59-106719, JP-A-58-22515, etc., an outer ring for a cylindrical roller bearing produced by subjecting a metal material to forging or cutting, the inner surface of the collar portion has a diameter. A structure is described that is inclined in the direction toward the inner side in the axial direction toward the outer side in the direction. According to such a structure, the friction acting between the inner surface of the flange and the end surface of the cylindrical roller can be reduced, the power loss can be kept low, and the occurrence of seizure can be suppressed. However, the outer ring for cylindrical roller bearings made by forging or cutting metal materials not only increases the manufacturing cost, but also increases the thickness in the radial direction, so the compressor for car coolers and suspension for motorcycles It is difficult to incorporate it into a rotation support part such as a steering gear. On the other hand, in the case of an outer ring for a shell type needle bearing formed by bending a metal plate as shown in FIGS. 15 to 16, the manufacturing cost can be kept low, and the thickness dimension in the radial direction Is also suppressed. However, the edge of the folded portion 5a (or 5b) cannot be inclined in the above direction, and improvements are desired from the viewpoint of reducing power loss and preventing seizure.
The manufacturing method of the outer ring for shell type needle bearings of the present invention is invented in view of such circumstances .
[0008]
[Means for Solving the Problems]
The outer ring for a shell type needle bearing manufactured by the manufacturing method of the present invention is formed into a cylindrical shape by bending a metal plate in the same manner as the conventional outer ring for a shell type needle bearing described above, and both end edges in the axial direction are formed. Folding portions are formed by folding back 180 degrees inward in the diameter direction, and the end edges of the folded portions are directly opposed to the end surfaces of the needles.
[0009]
Particularly, in the outer ring for a shell type needle bearing manufactured by the manufacturing method of the present invention, the end edge of each folded portion is inclined in the direction toward the inner side in the axial direction toward the outer side in the diameter direction, and the diameter of the end edge is increased. It is characterized in that the direction outer end position is substantially matched with the track surface position provided on the inner peripheral surface of the outer ring.
[0010]
In the manufacturing method of the present invention for producing such an outer ring for a shell needle bearing , the first folded portion is formed by folding one end edge of a cylindrical metal plate 180 degrees, and then the first folded portion is formed. By applying a surface pressing process to the edge of the folded part, the edge of the first folded part is inclined inward in the axial direction as it goes outward in the diameter direction, and the outer edge in the diameter direction of the edge The position of the metal plate is made to substantially coincide with the position of the raceway surface provided on the inner peripheral surface of the outer ring, and then the other end edge of the metal plate, which has been inclined at a predetermined angle in advance, is turned back by 180 degrees. And the edge of the second folded portion is inclined in the direction toward the inside in the axial direction toward the outside in the diametrical direction, and the diametrically outer end position of the end edge is provided on the inner peripheral surface of the outer ring. Almost match the position of the track surface.
[0011]
[Action]
In the case of the outer ring for the shell type needle bearing manufactured by the manufacturing method of the present invention as described above, the edge of each folded portion is inclined in the direction toward the inner side in the axial direction toward the outer side in the diametrical direction. Since the outer edge position in the diameter direction of the end edge substantially coincides with the position of the raceway surface provided on the inner peripheral surface of the outer ring, the end edge of each folded portion and the end face of the needle are the diameter of the end edge and the end face. They are in contact with each other at the outer ends in the direction. Therefore, even when the needle rotates in a state where a force in the thrust direction is applied, the contact state between the end surface of each needle and the end edge of the folded portion becomes a contact state close to rolling contact. As a result, it is possible to reduce friction loss and prevent seizure.
Moreover, shell type needle bearing outer rings made by bending a metal plate are cheaper to manufacture and thicker in the radial direction than those made by forging or cutting metal materials. Can be kept small. For this reason, it is possible to realize a structure suitable for incorporation in a rotation support portion such as a car cooler compressor, a suspension for a two-wheeled vehicle, or a steering gear.
[0012]
【Example】
1 to 4 show an example of an outer ring for a shell type needle bearing manufactured by the manufacturing method of the present invention . The cylindrical metal plate is formed in the diameter direction (FIG. 1, FIG. 1) at both ends in the axial direction (left and right direction in FIGS. 1 and 3) of the outer ring 1b. The folded portions 5a and 5b are formed by folding 180 degrees inwardly (in the vertical direction of 3). The curvature radii of the folded portions 5a and 5b are made sufficiently small so that the positions of the outer peripheral surfaces 7 and 7 of the folded portions 5a and 5b substantially coincide with the positions of the inner peripheral surface 8 that is the raceway surface of the outer ring 1b. ing. The end edges 6a and 6a of the folded portions 5a and 5b are directly opposed to the end surfaces 3a and 3a of the needle 3, respectively.
[0013]
In particular, in the outer ring for the shell type needle bearing of the present example , the end edges 6a and 6a of the folded portions 5a and 5b are arranged in the diametrical direction as shown in detail in FIGS. The angle θ in the direction toward the axially inner side (the right side in FIGS. 2 and 4A, the left side in FIGS. 2 and 4B) as it goes outward (the lower side in FIGS. 2 and 4). Just tilted. Therefore, the diameter direction outer end positions of the end edges 6a, 6a substantially coincide with the track surface position which is the inner peripheral surface 8 of the outer ring 1b.
[0014]
In the case of the outer ring for the shell type needle bearing of this example configured as described above, the end edges 6a, 6a of the folded portions 5a, 5b and the end faces 3a, 3a of the needles 3 are the end edges 6a, 6a and the end faces. The portions 3a and 3a are in contact with each other at the portions near the outer ends in the diameter direction. Therefore, even when a force in the thrust direction is applied and the needle 3 rotates in a state where any one of the end edges 6a and any one of the end faces 3a is in contact, the end face 3a of each needle 3 and the folded portion 5a (5b) The contact state with the edge 6a is a contact state close to rolling contact. As a result, the frictional force acting on the contact portion is reduced, heat generation at the contact portion is reduced, and friction loss can be reduced and seizure prevention can be achieved. The tilt angle θ of each of the end edges 6a, 6a is sufficient in terms of function if it is about 1 to 5 degrees, but may be slightly larger than this angle.
[0015]
Next, FIGS. 5 to 10 show an embodiment of the manufacturing method of the present invention in which an outer ring for a shell type needle bearing as described above is manufactured . First, after one end edge portion (lower end edge portion in FIGS. 5 to 6) of the metal plate formed in a cylindrical shape is turned back by 180 degrees to form the turn-up portion 5a which is the first turn-back portion, FIGS. As shown in FIG. 2, surface pressing is applied to the edge 6a of the folded portion 5a. That is, in a state where the metal plate on which the folded portion 5a is formed is held in the die 9, the punch 10 is inserted into the metal plate, and the edge of the folded portion 5a is formed by the step portion 11 formed on the punch 10. 6a is strongly pressed, and this edge 6a is moved in the axial direction (the vertical direction in FIGS. 5 to 6) toward the outer side (left side in the same figure) in the diameter direction (left and right direction in FIGS. 5 to 6) by the angle θ. It is inclined in the direction toward the upper side of the figure.
[0016]
Next, as shown in FIGS. 7 to 8, the edge 14 of the metal plate is inclined by a predetermined angle in a predetermined direction. That is, the metal plate on which the folded portion 5a is formed is held in the receiving mold 13 with the folded portion 5a being abutted against the receiving portion 12, and the tip of another punch 15 is placed inside the metal plate. insert. Then, the step edge 16 formed on the outer peripheral surface of the punch 15 is abutted against the edge 14 to incline the edge 14. Note that the inclination direction and the inclination angle α of the edge 14 are experimental so that the inclination angle θ of the edge 6a after the formation of the folded portion 5b, which is the second folded portion described below, becomes an appropriate value. Stipulated in
[0017]
In this way, if the edge 14 of the metal plate is inclined, the other end edge of the metal plate having the edge 14 (the upper edge in FIGS. 7 to 8) is removed from the state shown in FIG. The folded portion 5b as the second folded portion is formed by folding back 180 degrees to the state shown in FIG. In this state, the edge 6a of the folded portion 5b is in the axial direction (vertical direction in FIG. 10) inside (lower side in the figure) toward the outer side (right side in the figure) in the diameter direction (left and right direction in FIG. 10). Inclined at an angle θ (1 to 5 degrees) in the direction toward. The action of the outer ring for the shell type needle bearing manufactured by the manufacturing method of the present invention configured as described above is as described above.
[0018]
In addition, the shape of the edge 6a of each folding | returning part 5a, 5b does not necessarily need to be a simple mortar shape, For example, it can also be set as a shape as shown to FIG. 11 (A)-(C). First, the first example shown in (A) is one in which a right-angle portion is left only at the outer peripheral edge, the second example shown in (B) is one that is inclined while being curved convexly, and shown in (C). In the third example, the convexly curved inclined surface and the right-angled portion are combined. In any case, the contact state between the end edge 6a and the end surface 3a of the needle 3 (see FIGS. 1 and 2) can be made close to rolling contact.
[0019]
In addition, a shell-type needle bearing constructed by incorporating an outer ring for a shell-type needle bearing manufactured by the manufacturing method of the present invention does not necessarily have to be provided with a cage. Needle bearings can also be used. Furthermore, the shape of the end surface 3a of the needle 3 combined with the outer ring for the shell type needle bearing manufactured by the manufacturing method of the present invention does not necessarily have to be flat, and may swell in a spherical shape as shown in FIG. . However, in this case, the inclination angle θ of each folded portion 5a (5b) is slightly increased.
[0020]
【The invention's effect】
Since the manufacturing method of the outer ring for the shell type needle bearing of the present invention is configured and operates as described above, the rotation support portion incorporating the obtained shell type needle bearing rotates while receiving the force in the thrust direction. However, friction loss and heat generation due to friction can be reduced. As a result, it is possible to reduce power loss and prevent seizure, and to obtain a high-performance and highly reliable rotation support portion.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a shell needle bearing incorporating an outer ring manufactured by the manufacturing method of the present invention.
2 is an enlarged view of a main part of FIG. 1, in which (A) shows the A part of FIG. 1 and (B) shows the B part.
FIG. 3 is a sectional view showing only an outer ring.
4 is an enlarged view of a main part of FIG. 3, in which (A) shows the A part of FIG. 3 and (B) shows the B part.
FIG. 5 is a cross-sectional view showing a state in which the edge of the first folded portion is processed.
6 is an enlarged view of a portion X in FIG.
FIG. 7 is a cross-sectional view showing a state in which the other end edge of the metal plate is processed.
FIG. 8 is an enlarged view of a Y part in FIG.
FIG. 9 is a diagram showing the other end edge portion of the metal plate whose edge has been processed, in a state before being turned back;
FIG. 10 is a cross-sectional view showing a state in which the other end edge portion is folded to form a second folded portion.
FIG. 11 is a cross-sectional view showing three examples of another shape of the folded portion edge.
FIG. 12 is a half sectional view of a full roller needle bearing.
FIG. 13 is a partial cross-sectional view of a shell-type needle bearing having a convex end surface of the needle.
FIG. 14 is a half sectional view showing a first example of a conventional shell type needle bearing.
FIG. 15 is a half sectional view showing the second example.
16 is an enlarged view of a main part of FIG. 15, in which (A) shows the A part of FIG. 15 and (B) shows the B part.
[Explanation of symbols]
1, 1a, 1b Outer ring 2 Holding portion 3 Needle 3a End surface 4 Cage 5a, 5b Folded portion 6, 6a End edge 7 Outer surface 8 Inner surface 9 Die 10 Punch 11 Step portion 12 Receiving portion 13 Receiving die 14 End edge 15 Punch 16 step

Claims (1)

The axial end edges of the cylinder formed by bending the metal plate are folded back 180 degrees each inward in the diametrical direction, thereby turning the outer circumferential surface position of each folded portion and the inner circumferential surface position of the cylinder. In the outer ring for the shell type needle bearing in which the end edges of the folded portions are directly opposed to the end surfaces of the needles, respectively, and the one end edge portion of the cylindrical metal plate is folded back 180 degrees. After forming the first folded portion by this, by applying a surface pressing process to the edge of the first folded portion, the edge of the first folded portion is moved inward in the axial direction toward the outer side in the diameter direction. The metal in which the outer edge position in the diameter direction of the edge is substantially coincided with the position of the raceway surface provided on the inner peripheral surface of the outer ring, and then the edge is inclined in advance at a predetermined angle. The other edge of the plate The second folded portion is formed by folding back at 80 degrees, and the edge of the second folded portion is inclined in the direction toward the inner side in the axial direction toward the outer side in the diameter direction, and the outer end position in the diameter direction of the end edge is set to be inclined. A method of manufacturing an outer ring for a shell type needle bearing that substantially matches the position of the raceway surface provided on the inner peripheral surface of the outer ring.

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