JP2006132624A - Roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce cost of assembling by reducing mounting man-hour to a shaft part. <P>SOLUTION: A plurality of rollers (needle-like rollers) 3 held in a cage 2 are arranged on a raceway surface 1c between both inner ring collars 1a and 1b of a shell-shaped or solid-shaped inner ring 1 to lock the cage 2 in the axial direction and constitute an inner ring assembled component 5 integrating three components in a non-separation manner. At least the cage 2 of the inner ring assembled component 5 is nipped by both outer ring collars 4a, 4b of a shell-shaped outer ring 4 from both sides in the axial direction to integrate the outer ring 4 and the inner ring assembled component 5 in a non-separation manner. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to roller bearings such as needle roller bearings, and more particularly to roller bearings such as needle roller bearings used in automobile transmissions and other various industrial machines.

Roller bearings such as needle roller bearings are bearings having a large load capacity and excellent rotational performance, and are widely used in various parts such as high-speed rotation mechanisms and engine mechanisms of various machines. As such a needle roller bearing, there is a needle roller bearing (NRB) 8 with an inner ring 1 attached thereto as shown in FIG. The NRB 8 is a solid outer ring 4 in which the cage 2 and the needle rollers 3 are not separated and integrated. In such a needle roller bearing, the NRB 8 is incorporated in the housing 7 as indicated by an arrow P1, while the inner ring 1 is incorporated in the shaft portion 6 as indicated by an arrow P2 separately from the NRB 8. . In the figure, the solid line NRB 8 and the inner ring 1 are not assembled, and the phantom line NRB 8 and the inner ring 1 are assembled. In such a needle roller bearing, since the shaft portion 6 is rotatably supported by the housing 7, when incorporating between the shaft portion 6 and the housing 7, at least two assembling steps are required for assembling the NRB 8 and the inner ring 1 respectively. Therefore, the cost of assembling is high, and improvement of the assembling process is required.
JP 2004-162873 A

  The present invention provides a roller bearing that can be assembled between a shaft portion and a housing in one step.

  The roller bearing according to the present invention has a structure in which a plurality of rollers held by a cage are arranged on a raceway surface between both inner ring rods of a solid type or shell type inner ring to prevent the cage from coming off in the axial direction. The inner ring assembly is a non-separated inner ring assembly, and the outer ring is made non-separated from the inner ring assembly by sandwiching at least the cage of the inner ring assembly from both sides in the axial direction with both outer ring rods of the shell type outer ring. It is.

  The roller bearings include not only needle roller bearings but also general roller bearings. The inner ring rod is radially outward and the outer ring rod is radially inward.

  According to the present invention, the inner ring portion and the cage are not separated and integrated as an inner ring assembly, and the outer ring is not separated and integrated from the inner ring assembly. Therefore, the roller bearing is arranged between the shaft portion and the housing. Assembling can be performed by one assembling process, and the number of assembling steps of the roller bearing, which conventionally required two processes, is reduced by one process, and the assembling cost can be reduced.

  Further, when the inner diameter of at least one outer ring of the outer ring is made smaller than the outer diameter of the inner ring of the inner ring on the same side and the outer ring is engaged with the outer side of the inner ring, the outer ring is pushed to The roller bearing can be incorporated into the portion.

  If the inner diameter of both outer ring rods of the outer ring is made smaller than the outer diameter of both inner ring rods of the inner ring, and a seal (sealing device) is interposed between both outer ring rods and both inner ring rods, the seal can be incorporated at the same time. It is preferable because the process of attaching the seal can be simplified.

  The inner diameter of both inward facing rods of the outer ring can be made larger than the outer diameter of both outward facing rods of the inner ring.

  Of the inner ring and outer ring, when the inner ring has a shell shape, the inner ring rod is bent outward in the radial direction, bent radially outward from the radial bent end, and bent from the axial bent end. A collar configuration folded back inward in the axial direction, or a collar configuration folded in the radial outward direction, bent outward in the axial direction from the radially folded end, and folded inward in the axial direction from the axially folded end It is good also as a structure which ensured the heel strength.

  Since the roller bearing of the present invention can be assembled between the shaft portion and the housing in one step, the assembling cost can be reduced.

  Hereinafter, a roller bearing according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the present invention, as an example, the present invention is applied to a needle roller bearing in the embodiment. However, the present invention is not limited to a needle roller bearing, and can of course be applied to other types of roller bearings. .

(Embodiment 1)
The needle roller bearing shown in FIG. 1 is a solid type in which an inner ring 1 is manufactured by cutting a steel plate, and is provided with radially outward inner ring rods 1a and 1b on both axial sides of a cylindrical body 1d. The cage 2 is a welding type in which a metal plate such as a strip-shaped steel plate is rounded and welded at both ends to form a ring, or a non-welded type such as a thin steel plate formed by deep drawing or rolling. Consists of. The cage 2 has an inner diameter larger than the outer diameter of the inner ring rods 1a and 1b, and has a needle shape in the circumferential window hole 2a on the outer diameter side opposite to the inner ring 1 with respect to the roller pitch circle (roller PCD). This is a roller guide type in which the roller 3 is held and the needle roller 3 is prevented from falling off to the outer diameter side. The cage width W1 of the cage 2 is shorter than the inner ring width W2 of the inner ring 1 and longer than the facing distance W3 of the inner side surfaces 1e and 1f of the inner ring rods 1a and 1b. This dimensional relationship is the same in the following second and third embodiments.

  A cage 2 is disposed on the inner ring raceway surface 1c formed on the inner surface of the cylindrical body 1d between the inner ring rods 1a, 1b of the inner ring 1, and needles are inserted into the respective window holes 2a in the circumferential direction from the inner diameter side of the cage 2. The roller 3 is incorporated, whereby the inner ring 1, the cage 2 and the needle roller 3 are made into a non-separable integrated inner ring assembly 5.

  The outer ring 4 is formed in a shell shape by deep drawing of a steel plate, and includes an outer ring rod 4a that is bent inward in the radial direction at one side edge of the thin cylindrical body 4c. The outer ring 4 has an inner diameter of one outer ring rod 4a smaller than the outer diameter of the inner ring rod 1a of the inner ring 1 on the same side, and the outer ring rod 4a is overlapped with the outer side of the inner ring rod 1a. After the outer ring 4 is assembled on the outer diameter side of the inner ring assembly in the above-mentioned engaged state, the other side edge is bent backward inward in the radial direction to form an outer ring rod 4b, which is not separated from the inner ring assembly 5 It is integrated. The outer ring rod 4b is thin to facilitate post-bending. The outer ring 4 is subsequently hardened and hardened for bending, and then the thin portion of the outer ring flange 4b is softened by an appropriate heat treatment. There are various heat treatments such as quenching the outer ring 4 and post-bending the outer ring rod 4b, followed by heat treatment such as quenching, and the present embodiment is not limited to these heat treatments.

  In the needle roller bearing having the above-described configuration, the inner ring 1 and the outer ring 4 are assembled in a non-separable integrated manner, and the cage 2 is prevented from coming off between the inner ring 1 and the outer ring 4 in the axial direction. Since the roller bearing integrated in this way can be press-fitted between the shaft portion and the housing by pressing the outer ring rod 4a bent forward of the outer ring 4, the assembling process becomes one process, and the assembling cost is reduced. To do.

  Next, the manufacture of the needle roller bearing according to the first embodiment will be described with reference to FIGS. 2 to 6. The inner ring 1 is formed into a solid shape having inner ring rods 1a and 1b on both sides in the axial direction by cutting a steel plate. Produced. As shown in FIG. 2, an annular cage 2 having a plurality of window holes 2 a in the circumferential direction is disposed on the outer diameter side of the inner ring 1. Next, as shown in FIG. 3, the needle rollers 3 are inserted into the window holes 2 a of the cage 2 from the inner diameter side. As a result, a plurality of rollers 3 held by the cage 2 are arranged on the raceway surface 1c between the inner ring rods 1a, 1b of the inner ring 1 to prevent the cage 2 from coming off in the axial direction so The separated inner ring assembly 5 is completed. Next, of the outer ring rods 4a and 4b on both sides in the axial direction, the outer ring 4 bending the outer ring rod 4a on one axial side is disposed on the left side of the inner ring assembly 5 as shown in FIG. As shown by 5, it is extrapolated to the inner ring assembly 5. Thereafter, the remaining outer ring rod 4 of the outer ring 4 is bent radially inward as shown in FIG. As a result, the outer ring 4 is not separated from the inner ring assembly 5.

  In order to rotatably support the shaft portion 6 on the housing 7 by such a roller bearing, the shaft portion 6 is assembled between the shaft portion 6 and the housing 7 as shown in FIG. In FIG. 7, the needle roller bearing before being assembled is shown on the left side of the shaft portion 6 by a solid line, and the needle roller bearing after being assembled between the shaft portion 6 and the housing 7 is shown by an imaginary line. In this incorporation, the needle roller bearing indicated by the solid line is pushed in the direction indicated by the arrow P3 and inserted between the shaft portion 6 and the housing 7 like the needle roller bearing indicated by the phantom line. That is, in the first embodiment, the inner ring assembly 5 and the outer ring 4 are non-separable and integrated, so that the needle roller is formed only in one assembling step of pushing the bent outer ring rod 4a of the outer ring 4 in the direction of the arrow P3. Bearings can be incorporated.

  As described above, according to the needle roller bearing of the first embodiment, in the high-speed rotation mechanism part and the engine mechanism part of various machines, the needle roller bearing is attached in order to rotatably support the shaft part on the housing. Unlike the conventional process that required two processes, it is possible to reduce the time and effort of assembly, and the cost of the assembly can be reduced.

  In addition, although the inner ring 1 of Embodiment 1 was a solid form by the cutting process of a steel plate, it is good also as a shell type inner ring by the deep drawing process of the thin steel plate of a steel plate. Although this shell-shaped inner ring may be a normal one, in order to secure the collar strength, for example, as the inner ring 1, as shown in FIG. 8, inner ring collars 1a and 1b on both axial sides of the cylindrical body 1d of the inner ring 1 are used. The inner ring rod 1a, 1b is a shell-shaped inner ring 1 which is bent radially outward and folded radially inward from the bent end, and both axial end surfaces of the needle roller 3 are the inner ring rod 1a, The needle rollers 3 are held in the cage 2 at axially opposite positions to the inner side surfaces 1c and 1d of 1b and radially outside the rollers PCD, and the three of the inner ring 1, the cage 2 and the needle rollers 3 are arranged. It can be set as the structure of the inner ring assembly 5 which integrated the person.

  In addition to the above structure, the inner ring 1 is further bent outward in the radial direction as inner ring rods 1a and 1b on both sides in the axial direction of the cylindrical body 1d of the inner ring 1 in order to ensure the strength of the rod, as shown in FIG. The shell-shaped inner ring 1 is formed of inner ring flanges 1a and 1b which are bent axially outward from the radially bent end and turned axially inward from the axially bent end. Both end surfaces are opposed to the inner surfaces of the inner ring rods 1a and 1b in the axial direction, and the needle rollers 3 are held by the cage 2 at positions radially outward from the rollers PCD. The inner ring assembly 5 can be configured by integrating the three members with the roller 3.

  In the needle roller bearing having the above-described configuration, the inner ring 1 and the outer ring 4 are assembled in a non-separable integrated manner, and the cage 2 is prevented from coming off between the inner ring 1 and the outer ring 4 in the axial direction. Since the roller bearing integrated in this way can be press-fitted between the shaft portion and the housing by pressing the outer ring rod 4a bent forward of the outer ring 4, the assembling process becomes one process, and the assembling cost is reduced. To do.

(Embodiment 2)
FIG. 10 is a cross-sectional view of the needle roller bearing according to the second embodiment. The structure in which the needle roller bearing of the second embodiment is different from the needle roller bearing of the first embodiment is shown in FIG. The inner diameters of both outer ring rods 4a and 4b are smaller than the outer diameter of the inner ring rods 1a and 1b, and seals 5a and 5b are interposed on the inner side surfaces 4c and 4d of the outer ring rods 4a and 4b. The inside of the bearing is sealed. The seals 5a and 5b are not shown in detail, but can be constituted by contact seals such as an oil seal and a mechanical seal, for example. Note that the facing gap between the outer ring rods 4a and 4b and the inner ring rods 1a and 1b can be configured as a non-contact type seal structure such as a labyrinth seal. Since the specific configurations of these seals 5a and 5b are well known, their details are omitted.

  Also in the needle roller bearing of the second embodiment, as in the first embodiment, the inner ring 1 and the outer ring 4 are integrally assembled in a non-separable manner, and the cage 2 is interposed between the inner ring 1 and the outer ring 4. It has been retained. Since the needle roller bearing integrated in this way can be press-fitted between the shaft portion and the housing by pressing the outer ring rod 4a bent forward of the outer ring 4, the assembling process is one process, and the assembling cost is reduced. Can be reduced.

(Embodiment 3)
FIG. 11 is a cross-sectional view of the needle roller bearing according to the third embodiment, and the needle roller bearing of the third embodiment is different from the needle roller bearings of the first and second embodiments. The structure is that both outer ring rods 4a and 4b of the outer ring 4 have inner diameters larger than the outer diameters of the inner ring rods 1a and 1b.

  Also in the needle roller bearing of the third embodiment, as in the first and second embodiments, the inner ring 1 and the outer ring 4 are integrally assembled in a non-separable manner, and the cage 2 is integrated with the inner ring 1. It is secured between the outer ring 4 and the outer ring 4. Since the roller bearing integrated in this way can be pressed between the shaft portion and the housing by pressing the bent outer ring rod 4a of the outer ring 4 and the inner ring rod 1a of the inner ring 1, an assembling process can be performed. As a result, the cost of installation can be reduced.

  In addition, this invention is not limited to the said embodiment, It can implement by giving a various change thru | or deformation | transformation within a claim.

It is sectional drawing of the needle roller bearing which concerns on Embodiment 1 of this invention. It is a figure which shows the first process of the manufacture process of a needle roller bearing. It is a figure which shows the next process of the manufacture process of a needle roller bearing. It is a figure which shows the next process of the manufacture process of a needle roller bearing. It is a figure which shows the next process of the manufacture process of a needle roller bearing. It is a figure which shows the last process of the manufacturing process of a needle roller bearing. It is a figure which shows incorporating the needle roller bearing to a shaft part and a housing. It is sectional drawing of the shell type inner ring | wheel replaced with the solid type inner ring | wheel of FIG. It is sectional drawing of the other shell type inner ring | wheel replaced with the solid type inner ring | wheel of FIG. It is sectional drawing of the needle roller bearing which concerns on Embodiment 2 of this invention. It is sectional drawing of the needle roller bearing which concerns on Embodiment 3 of this invention. It is a figure where it uses for description of the process assembled between the axial part and housing by the conventional needle roller bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 1a, 1b Inner ring cage 2 Cage 3 Needle roller 4 Outer ring 4a, 4b Outer ring cage 5 Inner ring assembly 6 Shaft part 7 Housing

Claims (3)

  A plurality of rollers held by a cage are arranged on the raceway surface between both inner rings of a solid type or shell type inner ring to prevent the cage from coming off in the axial direction, and the above three members are non-separated and integrated inner ring assembly A roller bearing characterized in that the outer ring is made non-separate from the inner ring assembly by sandwiching at least the cage of the inner ring assembly from both sides in the axial direction between both outer ring rods of a shell-shaped outer ring.   2. An inner diameter of at least one outer ring rod of the outer ring is made smaller than an outer diameter of an inner ring rod of an inner ring on the same side, and the outer ring rod is engaged with the outer side of the inner ring rod. Non-separable integral roller bearing as described in 1.   The inner diameter of both outer ring rods of the outer ring is made smaller than the outer diameter of both inner ring rods of the inner ring, and a seal is interposed between the two outer ring rods and both inner ring rods. The described roller bearing.

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