JPH0530557U - Needle roller bearings - Google Patents

Abstract

(57) [Summary] [Purpose] To simplify the assembly process and outer ring processing process. [Structure] This needle roller bearing is a shell-shaped outer ring 5 having flanges 2 and 3 formed on both sides of a cylindrical rolling surface 1, and a plurality of rollingly mounted rolling surfaces 1 of the outer ring 5. Needle rollers 6 and a cage 7 for holding the needle rollers 6 at equal intervals around the circumference.
Composed of. The flange portion 2 on one side has a tapered shape that faces the outside of the bearing, and the flange portion 3 on the other side has a shape that faces in the radial direction. A protrusion 8 is formed on the outer diameter portion on one side of the cage 7, and the protrusion 8 is formed on the flange 2
Assembly A of the roller 6 and the cage 7 by engaging with the inner surface of the
To prevent slipping off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvements in needle roller bearings.

[0002]

[Prior Art]

 As shown in FIG. 5, in a needle roller bearing, generally, a needle roller 26 held by a cage 27 is rolled on a shell-shaped outer ring 25 having flanges 22 and 23 formed on both sides of a rolling surface 21. It is assembled freely.

FIG. 6 shows the main manufacturing steps of this needle roller bearing. First, the outer ring material 25 'made of a steel plate is deep-drawn to form a cup shape. Next, the bottom portion of the cup is punched out to form the flange portion 23 on the other side, the entire surface is subjected to quenching treatment, and then the rolling surface 21 is processed. Then, the roller / retainer assembly B in which the needle rollers 26 are housed in the pockets of the retainer 27 is inserted into the outer ring 25, and the peripheral edge portion 22 'on the inlet side of the cup is bent to form a flange on one side. The part 22 is formed.

[0004]

[Problems to be solved by the device]

 In the above manufacturing process, the outer ring 25 is temporarily hardened with the bottom of the cup punched out, so it is necessary to partially anneal the peripheral edge 22 ′ when bending the flange 22. It is not preferable in terms of work efficiency. In addition, since it is necessary to bend the outer ring 25, which is a component, at the stage of entering the assembly process, it is not preferable in terms of process control. All of these are considered to be due to the structure itself of the conventional needle roller bearing.

An object of the present invention is to improve the above-mentioned problems in work efficiency and process control, which are recognized in conventional needle roller bearings.

[0006]

In the needle roller bearing of the present invention, the flange portion on one side is tapered toward the outside of the bearing, and can be engaged with the inner surface of the tapered flange portion. The protrusion is formed on the outer diameter portion of the cage.

[0007]

[Action]

 Since the flange portion on one side is tapered toward the outside of the bearing, the core / retainer assembly can be assembled into the outer ring from this flange portion side during assembly. The roller / retainer assembly slips out due to the engagement between the inner surface of the tapered flange and the protrusion of the retainer.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the needle roller bearing of this embodiment has a shell-shaped outer ring 5 in which flange portions 2 and 3 are formed on both sides of a cylindrical rolling surface 1, and a rolling surface of the outer ring 5. 1 is composed of a plurality of needle rollers 6 incorporated in a rolling manner and a cage 7 made of resin for holding the needle rollers 6 at equal intervals around the circumference. The flange portion 2 on one side of the outer ring 5 has a taper shape facing the outside of the bearing, and the flange portion 3 on the other side has a shape facing in the radial direction. The retainer 7 may be made of steel plate.

As shown in an enlarged manner in FIG. 2, a protrusion 8 is formed on the outer diameter portion on one side of the cage 7. The protrusion 8 has a gentle tapered portion 8a on the inner side of the bearing and an R portion 8b on the outer side of the bearing. By engaging the R portion 8b with the inner surface of the flange portion 2, the assembly A of the roller 6 and the cage 7 is prevented from falling off. Further, in this embodiment, the flange portion 2 of the outer ring 5 is made thinner than the cylindrical portion. The outer ring 5 is formed by subjecting the steel plate outer ring material to deep drawing and bottom punching similar to the conventional one (see FIG. 6), and then bending the flange portion 2 in advance before starting the assembly process. Then, it is formed into a final shape and then subjected to a quenching treatment. In the present embodiment, the flange portion 2 is made thin because the change point 2a of the wall thickness becomes the base point of bending when the flange portion 2 is bent. This is because it can be secured relatively easily and, as will be described later, the convenience at the time of assembly is taken into consideration. The processing and heat treatment of the outer ring 5 are all completed before the assembly process.

As shown in FIG. 3, the needle roller bearing can be assembled only by inserting the roller / keeper assembly A into the processed outer ring 5. That is, the inner diameter D1 of the small diameter end 2b of the flange portion 2 is set to be slightly smaller than the outer diameter D2 of the protrusion 8 of the cage 7, and the flange portion 2 is elastically moved in the outer diameter direction by the assembly A. When it is inserted while being deformed, the flange portion 2 is reduced in diameter when the projecting portion 8 passes through the small diameter end 2b, and the projecting portion 8 can be engaged with the inner surface of the flange portion 2 so that the entire assembly is completed. It's done. In the assembly A, the end surface R portion and the outer diameter surface of the roller 6, and the inclined portion 8a of the protrusion 8 are guided by the small diameter end 2b of the flange portion 2 and fit into the outer ring 2. At that time, the flange portion 2 relatively easily expands the diameter by using the change point 2a of the wall thickness as a base point of elastic deformation, and the elastic diameter reduction of the retainer 7 is added to this, so that the assembly A has the outer ring 5 It is relatively easy to fit in. The corners of the small diameter end 2b may be rounded or chamfered.

In the embodiment shown in FIG. 4, the flange portion 2 of the outer ring 5 has the same wall thickness as the cylindrical portion. In this embodiment, the annular groove 2c serving as the base point of bending of the flange portion 2 is formed, and the same operation as that of the wall thickness changing point 2a described above is performed.

[0013]

[Effect of the device]

 According to the present invention, by assembling the flange portion on one side of the outer ring into a taper shape and forming the protrusion capable of engaging with the flange portion on the outer diameter portion of the cage, the assembly of the roller and the cage is formed. The assembly is completed by simply inserting the into the outer ring. Therefore, according to the present invention, not only the efficiency of the assembling work is improved, but also all the processing and heat treatment for the outer ring can be completed before entering the assembling process, which is advantageous in the process management. Becomes

[Brief description of drawings]

FIG. 1 is a sectional view of a needle roller bearing according to the present invention.

FIG. 2 is an enlarged cross-sectional view (FIG. A) around a flange portion on one side, and an enlarged cross-sectional view (FIG. B) of a protrusion of a cage.

FIG. 3 is a cross-sectional view showing a method of assembling the needle roller bearing according to the present invention.

FIG. 4 is a sectional view showing a needle roller bearing according to another embodiment of the present invention.

FIG. 5 is a sectional view showing a conventional needle roller bearing.

FIG. 6 is a cross-sectional view showing a manufacturing process of a conventional needle roller bearing.

[Explanation of symbols]

 1 Rolling surface 2 Flange on one side 3 Flange on the other side 5 Outer ring 6 Needle roller 7 Cage 8 Projection

Claims (1)

[Scope of utility model registration request] 1. A needle roller in which a needle roller held by a cage is rotatably incorporated into a shell-shaped outer ring having flange portions bent toward the inner diameter side formed on both sides of a cylindrical rolling surface. In the bearing, the flange portion on one side is tapered toward the outside of the bearing, and the protrusion that can be engaged with the inner surface of the tapered flange portion is formed on the outer diameter portion of the cage. Needle roller bearing.