JP2014015959A - Needle roller bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a needle roller bearing device capable of improving workability of assembling a double-split cage.SOLUTION: A needle roller bearing device comprises: a needle roller bearing 2 including a cage 21 that is formed cylindrically and has pockets passing radially through the cage 21 at several circumferential locations, and a plurality of needle rollers 22 retained in respective pockets of the cage 21; and a drive shaft 3, on the outer periphery of which the needle roller bearing 2 is mounted. The cage 21 is split at two circumferential locations and has step parts 21c with reduced diameters at both axial ends. In the drive shaft 3, peripheral grooves 32, which are recessed in the outer periphery and in which the needle roller bearing 2 are mounted, are formed. On the walls at both ends of the peripheral grooves 32, tabs 31 projecting from the outer periphery of the drive shaft 3 in the radially outward direction. After the needle roller bearing 2 is mounted in the peripheral grooves 32, the tabs 31 are bent in the axially inside direction to oppose the step parts 21c, which prevents the needle roller bearing 2 to being detached.

Description

  The present invention relates to a needle roller bearing device.

  2. Description of the Related Art Conventionally, for example, a needle roller bearing device installed in a manual transmission of an automobile includes a drive shaft that is a rotating shaft and a needle roller bearing that is interposed between a transmission gear that is mounted on the drive shaft. . The needle roller bearing includes a cage formed in a cylindrical shape and having pockets penetrating in the radial direction at several circumferential positions, and a plurality of needle rollers held in the pockets of the cage. And it is not equipped with an outer ring | wheel, and it is what is called a cage and roller. Needle roller bearings use a drive shaft as an inner ring and a transmission gear as an outer ring.

  In the manual transmission, when driving force is transmitted to the transmission gear, the transmission gear is in a state of rotating in synchronization with the drive shaft and a load is applied to the needle roller bearing, that is, load synchronization. Rotating state. On the other hand, when the driving force is not transmitted to the transmission gear, the transmission gear rotates relative to the drive shaft, and no load is applied to the needle roller bearing, that is, a no-load relative rotation state.

  In the load synchronous rotation state, since the transmission gear, the drive shaft, and the needle roller bearing rotate as one body, the needle roller usually does not relatively move. For this reason, fretting wear may occur when the rollers vibrate slightly at the same position on the inner peripheral surface of the transmission gear serving as the raceway surface and the outer peripheral surface of the drive shaft. In order to prevent this fretting wear, the needle roller bearing device divides the cage into two parts to provide a gap at the split portion, and the needle rollers are relatively moved by facilitating the rotation of the cage.

  However, since this cage roller bearing device is divided into cages, when assembling a manual transmission, after the cage is mounted on the drive shaft, it is held down by hand so that it does not fall off. It is necessary to wear and workability has deteriorated. Therefore, the workability at the time of assembling the manual transmission is improved by filling the gap between the split portions of the cage with the adhesive and integrating the cage, and the adhesive increases due to the temperature rise when the manual transmission is used. There is a needle roller bearing device in which the adhesiveness is reduced and the cage is divided. (For example, see Patent Document 1)

Japanese Utility Model Publication No. 6-6743

  However, in the above needle roller bearing device, when the cage is formed by press-molding a steel plate, the area of the end face of the split portion is small, so that the cage may not be integrated with an adhesive. Therefore, the needle roller bearing device has had a problem of improving the assembling workability of the split cage.

  The present invention has been made to solve such a problem, and an object thereof is to provide a needle roller bearing device capable of improving the assembling workability of the split cage.

  In order to solve the above-mentioned problem, a configuration feature of the needle roller bearing device according to claim 1 is that the cage is formed in a cylindrical shape and includes pockets penetrating in the radial direction at several circumferential positions, and the cage A needle roller bearing device comprising: a needle roller bearing having a plurality of needle rollers held in each pocket; and a rotating shaft to which the needle roller bearing is mounted on an outer periphery, wherein the cage Is a circumferential groove that is divided at two locations in the circumferential direction and has stepped outer diameters at both ends in the axial direction, and the rotating shaft has a recessed outer periphery and is mounted with the needle roller bearing. And a flange that protrudes radially outward from the outer periphery of the rotating shaft is formed on the walls at both ends of the circumferential groove. After the needle roller bearing is mounted in the circumferential groove, the flange is axially The needle roller bearing is prevented from falling off by bending inward and facing the stepped portion. .

  According to the needle roller bearing device of the first aspect, after the needle roller bearing holding the needle roller with the cage is mounted on the rotary shaft, the outer diameter of both ends in the axial direction of the split cage is reduced. Since the needle roller bearing is prevented from falling off by the flange of the rotating shaft facing the portion, the assembly workability can be improved.

  The needle roller bearing device according to a second aspect of the present invention is characterized in that the stepped portion is formed on the entire circumference, the plurality of flanges are formed in the circumferential direction, or the collar is formed in the circumferential direction. In the case where a plurality of cages are formed, the length between the longest ribs in the circumferential direction is defined as the longest rib length, and among the cages divided into two, the circumferential length of the cage is shortest in the circumferential direction. The cage length is set so as to satisfy the relationship of “longest intercostal length <shortest cage length”.

  According to the needle roller bearing device of claim 2, even if the needle roller bearing is mounted on the rotating shaft regardless of the relative position in the circumferential direction between the rotating shaft and the split cage, the needle roller bearing is not dropped. Therefore, the assembly workability can be greatly improved.

  The needle roller bearing device according to claim 3 is characterized in that the rotary shaft is a rotary shaft provided in a transmission, and the needle roller bearing includes the rotary shaft and a transmission gear provided on the rotary shaft. It is interposed in the opposite annular space.

  According to the needle roller bearing device of the third aspect, when the needle roller bearing is interposed between the rotation shaft of the transmission and the transmission gear provided on the shaft, the assembly workability can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the needle roller bearing apparatus which can improve the assembly workability | operativity of a split cage can be provided.

1st Embodiment: It is sectional drawing which shows the use condition of a needle roller bearing apparatus. 1st Embodiment: (a) is A arrow directional view of the needle roller bearing of FIG. 1, (b) is a BB cross-sectional arrow directional view of FIG. 2 (a). 1st Embodiment: It is sectional drawing of the needle roller bearing apparatus in FIG. 1st Embodiment: It is CC sectional view taken on the line of FIG. 2nd Embodiment: It is CC sectional view taken on the line of FIG. 3, Comprising: Embodiment which a heel is formed in four places of the circumferential direction is shown.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a needle roller bearing device according to the present invention will be described below with reference to the drawings.
<First Embodiment>
FIG. 1 is a cross-sectional view showing a use state of the needle roller bearing device. This will be described with reference to FIG.

FIG. 1 shows a part of a manual transmission, and a radial needle roller bearing 2 is disposed between a drive shaft 3 (rotating shaft) and a transmission gear 4. In FIG. 1, 5 is a synchro hub, 6 is a coupling sleeve, and 7 is a synchronization ring.
Here, the needle roller bearing device of the present invention corresponds to the needle roller bearing 2 and the drive shaft 3.

In the manual transmission 1, when the coupling sleeve 6 is not engaged with the sync hub 5 and the engaging portion 41 of the transmission gear 4, the drive shaft 3 and the transmission gear 4 are rotated relative to each other. No driving force is transmitted to the transmission gear 4. And the needle roller bearing 2 will be in the state which is not loaded, ie, a no-load relative rotation state.
On the other hand, when the coupling sleeve 6 is moved in the axial direction and engaged with the sync hub 5 and the engaging portion 41 of the transmission gear 4, the drive shaft 3 and the transmission gear 4 rotate in synchronization with each other, A driving force is transmitted from the drive shaft 3 to the transmission gear 4. And the needle roller bearing 2 will be in the state to which a load is applied, ie, a load synchronous rotation state.

  The needle roller bearing 2 includes a cylindrical retainer 21 and a plurality of needle rollers 22 and does not include an inner ring and an outer ring, and is a so-called cage and roller. The needle roller bearing 2 uses the drive shaft 3 as an inner ring and the transmission gear 4 as an outer ring.

  The cage 21 is provided with pockets 21d penetrating in the radial direction at several places on the circumference thereof. The pocket 21d has a rectangular shape when viewed from above, and the needle rollers 22 are held against the pocket 21d so as not to come out in the radial direction. For example, although not shown, both the outer diameter side opening and the inner diameter side opening of the pocket 21d are provided with roller stoppers protruding in the circumferential direction, whereby the circumferential width dimension of the pocket 21d outer diameter side opening, Both the circumferential width dimensions of the inner diameter side opening are set to be smaller than the diameter of the needle roller 22.

  2A is a view taken along the arrow A of the needle roller bearing 2 shown in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line BB of FIG. 2A. This will be described with reference to FIGS. 2 (a) and 2 (b). The cage 21 is equally divided by two circumferentially divided portions 23 and is constituted by two arcuate cage divided bodies 21a and 21b. A predetermined gap is formed in the split portion 23 in the circumferential direction. At both ends of the cage 21 in the axial direction, step portions 21c whose outer diameter is reduced over the entire circumference are formed. As a material of the cage 21, for example, SPCD of a cold rolled steel plate is used. The stepped portion 21c is formed by a rolling process.

  FIG. 3 is a cross-sectional view of the needle roller bearing device in FIG. 4 is a cross-sectional view taken along the line CC of FIG. This will be described with reference to FIGS. The drive shaft 3 is formed with a circumferential groove 32 in which the outer periphery is recessed and the needle roller bearing 2 is mounted. On the walls at both ends in the axial direction of the circumferential groove 32, flanges 31 (indicated by a two-dot chain line) are formed to protrude radially outward from the outer periphery of the drive shaft 3 over the entire circumference. As a material of the drive shaft 3, for example, high carbon steel “S55C” is used.

  Next, assembly of the manual transmission 1 will be described with reference to FIGS. 3 and 4. When the needle roller bearing 2 is mounted on the drive shaft 3, the cage divided bodies 21 a and 21 b that hold the needle roller 22 and are divided into two are mounted in the circumferential groove 32. Then, the flange 31 is bent inward in the axial direction, and is opposed to the step portion 21c with a slight gap as shown by the solid line in FIG. Next, the transmission gear 4 is mounted radially outward of the needle roller bearing 2.

  Thereby, in the needle roller bearing device of the present embodiment, after the needle roller bearing 2 holding the needle roller 22 by the cage 21 is mounted on the drive shaft 3, the both ends of the split cage 21 outside the axial direction are outside. Since the needle roller bearing 2 is prevented from falling off by the flange 31 of the drive shaft 3 facing the stepped portion 21c whose diameter is reduced, it is not necessary to hold the needle roller bearing 2 by hand, and assembling workability can be improved.

  Further, in the needle roller bearing device of the present embodiment, the stepped portion 21c of the cage 21 and the flange 31 of the drive shaft 3 are formed over the entire circumference, so that in the circumferential direction of the cage 21 and the drive shaft 3 Even if the needle roller bearing 2 is mounted on the drive shaft 3 regardless of the relative position, the needle roller bearing 2 is prevented from falling off, so that the assembly workability can be greatly improved.

  As described above, according to the needle roller bearing device according to the present embodiment, the assembly workability of the split cage 21 can be improved.

Second Embodiment
The second embodiment is an embodiment of a configuration in which the flanges 31 of the drive shaft 3 are equally arranged at four locations in the circumferential direction in the needle roller bearing device in the first embodiment. In the second embodiment, the description of the same configuration as that of the first embodiment is omitted for the sake of brevity.

  FIG. 5 is a cross-sectional view taken along the line CC of FIG. 3 and shows an embodiment in which the flanges 31a are formed at four locations in the circumferential direction. On the walls at both ends in the axial direction of the circumferential groove 32 of the drive shaft 3, flanges 31 a that are equally distributed at four locations in the circumferential direction and project radially outward from the outer periphery of the drive shaft 3 are formed. Between the collar 31a and the collar 31a in the circumferential direction, the longest collar length E is arranged. The circumferential lengths of the cage dividers 21a and 21b are the shortest cage length D. The longest intercostal length E and the shortest cage length D are set to have a relationship of “longest intercostal length E <shortest cage length D”.

  Thereby, in the needle roller bearing device of the present embodiment, after the needle roller bearing 2 holding the needle roller 22 by the cage 21 is mounted on the drive shaft 3, the both ends of the split cage 21 outside the axial direction are outside. Since the needle roller bearing 2 is prevented from falling off by the flange 31a of the drive shaft 3 facing the stepped portion 21c whose diameter is reduced, it is not necessary to hold the needle roller bearing 2 by hand, and assembling workability can be improved.

  Further, in the needle roller bearing device of the present embodiment, the step portion 21c of the cage 21 is formed over the entire circumference, the flanges 31a of the drive shaft 3 are formed at four locations, and the “longest flange length E <The shortest cage length D ”is set so that the needle roller bearing 2 is mounted on the drive shaft 3 regardless of the relative positions of the cage 21 and the drive shaft 3 in the circumferential direction. However, since the needle roller bearing 2 is prevented from falling off, the assembling workability can be greatly improved.

  Further, the needle roller bearing device of the present embodiment can be reduced in weight because the flanges 31a are formed only at four locations in the circumferential direction.

  In the present embodiment, the ridges 31a are equally distributed at four locations in the circumferential direction, and the cage 21 is equally divided into two in the circumferential direction. The longest intercostal length E is defined as the longest intercostal length E, the circumferential length of the cage segment having a short circumferential length is defined as the shortest cage length D, and the “longest intercostal length” E <shortest cage length D ”may be set, and the position of the ridge in the circumferential direction and the circumferential length of the cage divider may be appropriately determined.

1: manual transmission, 2: needle roller bearing, 21: cage, 21a, 21b: cage divided body, 21c: stepped portion, 21d: pocket, 22: needle roller, 23: split portion, 3: drive Shaft (rotating shaft) 31, 31a: 鍔, 32: circumferential groove, 4: transmission gear, 41: engagement portion, 5: synchro hub, 6: coupling sleeve, 7: synchronization ring, D: shortest cage length E: Longest intercostal length

Claims (3)

A needle roller bearing having a cage formed in a cylindrical shape and having pockets penetrating in a radial direction at several circumferential locations, and a plurality of needle rollers held in each pocket of the cage, and the needle on the outer circumference A needle roller bearing device comprising: a rotating shaft on which a tapered roller bearing is mounted;
The retainer is divided at two locations in the circumferential direction, and has step portions whose outer diameters at both ends in the axial direction are reduced.
The rotating shaft is formed with a circumferential groove in which the outer periphery is recessed and the needle roller bearing is mounted.
The walls at both ends of the circumferential groove are formed with ridges protruding radially outward from the outer periphery of the rotating shaft,
After the needle roller bearing is installed in the circumferential groove, the needle roller bearing is prevented from falling off by bending the flange inward in the axial direction and facing the stepped portion. apparatus. The step is formed on the entire circumference,
The ridges are formed in a plurality or all around the circumferential direction,
When a plurality of the ridges are formed in the circumferential direction, the longest gap between the ridges in the circumferential direction is the longest ridge length, and among the cages divided into two, the circumference of the cage is short 2. The needle roller bearing device according to claim 1, wherein the length in the direction is the shortest cage length, and is set to have a relationship of “longest intercostal length <shortest cage length”. The rotating shaft is a rotating shaft equipped in a transmission,
The needle roller bearing device according to claim 1 or 2, wherein the needle roller bearing is interposed in an opposed annular space between the rotary shaft and a transmission gear mounted on the rotary shaft.

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