JP3651812B2 - Synthetic resin cage for roller bearings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin cage for roller bearings.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, cages incorporated in roller bearings such as cylindrical roller bearings, tapered roller bearings, and self-aligning roller bearings are often made of synthetic resin, which is lighter than metal ones and has excellent productivity and economy. Has been.
[0003]
However, for example, a roller bearing that supports the planetary shaft of a planetary transmission used in a drive unit of a bulldozer performs rotation, revolution, and eccentric operations, and thus easily causes poor lubrication. The temperature of the cage becomes considerably high due to friction. In addition, since the load acting on the roller bearing is large and it is necessary to increase the load capacity of the roller bearing by increasing the outer diameter of the roller, the size of the cage pocket increases accordingly, and the column portion between the pockets As a result, the strength of the cage decreases. For this reason, when a synthetic resin cage is used for the roller bearing that supports the planetary shaft, the cage is easily melted or damaged, and its durability is extremely deteriorated. Therefore, it is difficult to use a synthetic resin cage for the roller bearing, and the actual situation is that a metal cage is still used.
[0004]
In addition, the metal cage has a problem in that it is inconvenient in handling, for example, when the roller is incorporated into the outer ring or the inner ring together with the roller, the roller easily drops from the pocket.
The present invention has been made in view of the above problems, and provides a synthetic resin cage for a roller bearing capable of exhibiting excellent durability even under use conditions in which poor lubrication is likely to occur. With the goal.
Another object of the present invention is to provide a synthetic resin cage for a roller bearing that is likely to cause poor lubrication and that can exhibit excellent durability even under use conditions with a large load.
Another object of the present invention is to provide a synthetic resin cage for roller bearings that is convenient for handling such as roller assembly.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a synthetic resin cage for a roller bearing of the present invention is as follows:
In a synthetic resin cage for roller bearings, a plurality of pockets for accommodating rollers are formed at predetermined intervals along the circumferential direction.
Roller stoppers projecting toward the pockets are formed on the inner and outer peripheral edges of the central part in the axial direction of the pillars between the pockets, and the roller guides between the roller stoppers are in sliding contact with the rollers And is configured as
Forming a first oil communication portion that circulates the lubricant in the radial direction and supplies it to the roller guide portion at both side positions sandwiching the roller guide portion of the column portion,
On the outer periphery of the column portion, a second oil communication portion is formed that circulates the lubricant in the circumferential direction and supplies the lubricant to the roller guide portion ,
Auxiliary roller stoppers that perform roller locking in cooperation with the roller stoppers formed on the outer peripheral edge of the axially central portion of the column part are projected to the pocket side at the outer peripheral edges of both ends of the roller guide part. It is characterized by having formed in this way.
[0006]
According to the synthetic resin cage of the roller bearing having the above-described configuration, the lubricant filled in the roller bearing is circulated in the radial direction through the first oil communication portion in a state where the cage is incorporated in the roller bearing. In addition to being able to be supplied to the roller guide part, it can be supplied to the roller guide part by circulating in the circumferential direction through the second oil communication part.
Moreover, the roller accommodated in the pocket can be held by the roller stopper.
[0007]
Further, the synthetic resin cage for the roller bearing, the outer peripheral edge of the end portions of the roller guide portion, in cooperation with the stopper portion around which is formed on the outer periphery of the axially central portion of the pillar portion roller An auxiliary roller stopper for stopping is formed so as to project to the pocket side . Therefore , in this case, since the inclination of the roller can be suppressed in a state where the roller is incorporated in the cage, proper roller holding can be performed.
[0008]
In the above synthetic resin cage for roller bearings, it is preferable that each pocket can accommodate two rollers in parallel, and in this case, it is possible to accommodate two rollers in one pocket in parallel. Therefore, the number of rollers can be increased while thickening the pillar portion to ensure its strength. For this reason, the load capacity of the roller bearing incorporating the cage can be greatly increased.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view of an essential part of a synthetic resin cage for a roller bearing according to a comparative example that does not have an auxiliary roller stopper 7 described later . This synthetic resin cage for roller bearings is entirely formed of a polyamide-based synthetic resin such as nylon 66 mixed with glass fibers. In this cage, a plurality of pockets 1 are formed at predetermined intervals along the circumferential direction, and cylindrical rollers R are accommodated in the pockets 1 (see FIGS. 2 and 3).
[0010]
The column part 2 between the pockets 1 is provided with a roller stopper 3 that protrudes toward the pocket 1 side. The roller stopper 3 is an axially central portion of the column portion 2 and is provided at the inner peripheral edge 2a and the outer peripheral edge 2b. The roller stopper 3 on the inner peripheral edge 2a side and the outer peripheral edge 2b side. The column portion 2 between the roller stopper portions 3 is configured as a roller guide portion 4 that is in sliding contact with the cylindrical roller R.
[0011]
Further, first oil communication portions 5 that allow the lubricant to flow in the radial direction of the cage are formed at both axial end positions of the column portion 2 across the roller guide portion 4 of the column portion 2. ing. The first oil communication portion 5 is formed by notching the side surface of the column portion 2 so that a gap can be formed between the first oil communication portion 5 and the cylindrical roller R.
[0012]
A second oil communication portion 6 that allows the lubricant to flow in the circumferential direction of the cage is formed on the outer periphery of the column portion 2. The second oil communication portion 6 is formed by notching the first oil communication portion 5 and the roller stopper 3 on the outer peripheral edge 2b side in the circumferential direction.
The circumferential width W (see FIG. 2) of each pocket 1 is set so that two rollers can be accommodated in parallel.
[0013]
If it is the above structure, the lubricant with which the roller bearing was filled can be distribute | circulated to the radial direction of a holder | retainer through the 1st oil communication part 5, and the lubrication agent distribute | circulated to this radial direction is cylindrical roller. It can supply efficiently between R and the roller guide part 4 of the pillar part 2. FIG. Further, the lubricant can be circulated in the circumferential direction of the cage through the second oil communication portion 6, and the lubricant that circulates in the circumferential direction is used as the cylindrical roller R and the roller guide portion 4 of the column portion 2. Can be supplied efficiently. For this reason, it is possible to suppress overheating of the cage due to friction between the roller guide portion 4 and the cylindrical roller R even under use conditions in which poor lubrication is likely to occur, thereby exhibiting excellent durability. be able to.
[0014]
Moreover, since the cage can accommodate two rollers in each pocket 1 in a state of being arranged in parallel, the total number of cylindrical rollers R can be increased while securing the strength by thickening each column portion 2. can do. For this reason, the load capacity of the roller bearing can be significantly increased. Therefore, it can be particularly suitably used for a roller bearing that supports the planetary shaft of a planetary transmission that performs special movements such as rotation, revolution, and eccentricity.
[0015]
Further, the retainer can securely hold the cylindrical roller R accommodated in the pocket 1 by the roller stopper 3, so that the retainer is mounted together with the cylindrical roller R on the inner and outer rings of the roller bearing. When assembled, the cylindrical roller R is not likely to fall out of the pocket 1, and the handling becomes convenient. Further, even if it is used as a cage for the outer ring guide, the lubrication characteristics are not impaired.
[0016]
Next, an embodiment of implementation of the invention in FIGS.
In the present embodiment, auxiliary roller stoppers 7 are provided on the outer peripheral edges 2b of the both ends of the roller guide 4 with respect to the cage according to the comparative example (FIGS. 1 to 3) . This auxiliary roller stopper 7 cooperates with the roller stopper 3 formed on the outer peripheral edge 2b of the central portion in the axial direction of the column portion 2 to perform the roller stopper, and each auxiliary roller stopper 7 has a pocket. A predetermined amount is projected on one side.
[0017]
According to this embodiment, since the cylindrical roller R can be effectively prevented from tilting in a state in which the cylindrical roller R is incorporated in the cage, the cylindrical roller R can be compared with the cage shown in FIG. Assembling property into the pocket 1 is stable, and proper rolling and holding of the roller is possible.
The synthetic resin cage for roller bearings of the present invention is not limited to the above-described embodiment. For example, various designs such that the pocket 1 accommodates only one cylindrical roller R are possible. Changes can be made.
[0018]
【The invention's effect】
As described above, according to the synthetic resin cage for roller bearings of the present invention, the lubricant filled in the roller bearing is passed through the first oil communication portion and the second oil communication portion to surround the cage. Since it can distribute | circulate in a direction and radial direction and can supply efficiently to the roller guide part of a holder | retainer, the lubricity between holder | retainer places can be improved. Therefore, excellent durability can be exhibited even under use conditions where poor lubrication is likely to occur. Further, since the rollers accommodated in the pockets can be held by the roller stoppers, handling such as roller assembly becomes convenient.
[0019]
Further, the outer peripheral edge of both end portions of the roller guide portion, since the forming the auxiliary roller stoppers in a state incorporated in the cage of the cylindrical roller, it is possible to prevent the said cylindrical rollers is inclined, the roller It is possible to maintain proper rolling.
[0020]
In particular, when each pocket can accommodate two rollers in parallel, the load capacity of the roller bearing can be greatly increased, so that there is no lubrication failure such as a roller bearing for a planetary shaft of a planetary transmission. It is easy to occur, and can exhibit excellent durability even under use conditions where the load on the roller bearing is large.
[Brief description of the drawings]
FIG. 1 is a main part perspective view showing a comparative example of a synthetic resin cage for a roller bearing according to the present invention.
FIG. 2 is also a longitudinal sectional view.
FIG. 3 is a cross-sectional view of the same.
4 is an essential part longitudinal cross sectional view showing an implementation form of the synthetic resin cage for a roller bearing of the present invention.
FIG. 5 is a partial cross-sectional view taken along line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pocket 2 Column part 2a Inner peripheral edge 2b Outer peripheral edge 3 Roller stopper part 4 Roller guide part 5 First oil communication part 6 Second oil communication part 7 Auxiliary roller stopper part R Cylindrical roller

Claims (2)

In a synthetic resin cage for roller bearings, a plurality of pockets for accommodating rollers are formed at predetermined intervals along the circumferential direction.
Roller stoppers projecting toward the pockets are formed on the inner and outer peripheral edges of the central part in the axial direction of the pillars between the pockets, and the roller guides between the roller stoppers are in sliding contact with the rollers And is configured as
Forming a first oil communication portion that circulates the lubricant in the radial direction and supplies it to the roller guide portion at both side positions sandwiching the roller guide portion of the column portion,
On the outer periphery of the column portion, a second oil communication portion is formed that circulates the lubricant in the circumferential direction and supplies the lubricant to the roller guide portion ,
Auxiliary roller stoppers that perform roller locking in cooperation with the roller stoppers formed on the outer peripheral edge of the axially central portion of the column part are projected to the pocket side at the outer peripheral edges of both ends of the roller guide part. A synthetic resin cage for roller bearings characterized by being formed as described above . The synthetic resin cage for a roller bearing according to claim 1, wherein each pocket accommodates two rollers in parallel .

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