JPH09242760A - Synthetic resin-made crown type holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve lubricating performance of a bearing, and reduce generation of dust. SOLUTION: This crown type holder has pockets 5 and column parts 6. A first grease housing recessed part 7 and a second grease housing recessed part 8 are formed between the pocket 5 and the pocket 5. A projection 10 projecting in the axial direction from the column part 6 exists in the first grease housing recessed part 7, on the one hand, the projection projecting in the axial direction from the column part 6 does not exist in the second grease housing recessed part 8. Lubrication can be performed by oozing out base oil from grease at rotating time by grease held in the first grease housing recessed part 7, on the one hand, initial lubrication of a bearing can be sufficiently performed by grease scattered from the second grease housing recessed part 8 in the initial stage of rotation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin crown type cage that is capable of improving the lubrication performance of a bearing and reducing dust generation by grease lubrication.

[0002]

2. Description of the Related Art Conventionally, as this type of synthetic resin crown type cage, there is one shown in FIG. In this cage, pockets 51 into which balls are fitted and pillars 52 are alternately formed in the circumferential direction. The column portion 52 extends in the axial direction from a ring-shaped base portion (not shown). A protrusion 53 extending in the axial direction from the column portion 52 is present in the grease storage recess 56 which is recessed from the end of the column portion 52 toward the base side between the pockets 51 and 51. There is.
The protrusion 53 is a portion that is pushed by the tip of the extrusion pin at the time of mold release after injection molding.

Meanwhile, grease for lubrication is filled in the storage recess 56. This grease has a role of gradually exuding the base oil during rotation and lubricating the bearing with this base oil. Further, the grease also has a role of performing initial lubrication by being scattered from the storage recess 56 to the friction portion at the initial stage of rotation.

[0004]

However, the above-mentioned projection 5
If the concave portion 56 in which 3 exists has too much force to hold grease, the amount of grease scattered from the concave portion 56 at the initial stage of rotation and scattered on the balls and the raceway surface is insufficient, resulting in insufficient initial lubrication of the bearing. There is.

On the other hand, when the projection 53 is eliminated,
Since the grease holding force of the concave portion 56 becomes small, the amount of grease scattered during rotation increases. Therefore, although the initial lubrication of the bearing is sufficient, there is a problem that dust generation increases. Furthermore, there is a problem that the torque required for rotation becomes large, and there is also a problem that grease leakage easily occurs at high speed rotation.

Therefore, an object of the present invention is to provide a synthetic resin crown-type cage capable of supplying only a required amount of grease to a track for a long time from the initial stage, and reducing dust generation and reducing torque. To do.

[0007]

In order to achieve the above-mentioned object, the invention of claim 1 comprises a ring-shaped base portion and a plurality of pillar portions axially extending from the base portion and having ball holding claws. A crown retainer made of synthetic resin, having a pocket in which a ball is fitted between these pillar portions, which is recessed from the end portion of the pillar portion toward the base side, and grease during rotation. Is provided with a first grease storage concave portion that is easy to hold and does not easily scatter, and a second grease storage concave portion that is recessed from the end of the column portion toward the base side and that is difficult to hold grease and easily scatters during rotation. It is characterized by that.

According to the first aspect of the present invention, the grease stored in the second grease storing concave portion in the initial stage of rotation is
Then it is scattered into orbit. Therefore, poor lubrication does not occur even in the initial stage of rotation. Moreover, since the grease stored in the first grease storing recess remains held, the amount of grease scattered on the track does not become excessive, dust is not generated, and the torque is not increased. Absent. Also, after a predetermined period of time has passed after the rotation and all the grease in the second grease storage recess has been scattered, the base oil oozes out from the grease held in the first grease storage recess into the raceway, which allows lubrication. it can.

Therefore, according to the first aspect of the present invention, lubrication due to the scattering of grease from the second grease storage recess at the initial stage of rotation and the bleeding of the base oil from the grease in the first grease storage recess into the raceway during rotation. It is possible to perform both lubrication by means of the above, and it is possible to perform good lubrication for a long period of time while suppressing dust generation to a minimum and achieving a low torque. The lubrication performance of the bearing can be improved.

Further, it is possible to prevent the grease from scattering too much at the time of high speed rotation and prevent the grease from leaking.

According to a second aspect of the present invention, in the synthetic resin crown type cage according to the first aspect, the first grease accommodating recess has a length of a predetermined dimension that extends axially from the column portion. It is characterized in that it has a protrusion, and the second grease accommodating recess has a protrusion shorter than the predetermined size or does not have a protrusion.

According to the invention of claim 2, the grease retaining function of the first grease accommodating concave portion and the grease scattering function of the second grease accommodating concave portion are realized by the length of the projection from the column portion or the presence or absence thereof. can do. In addition, the grease holding force and the amount of dispersed grease can be adjusted to desired values by adjusting the degree of length and the number ratio of presence or absence of protrusions.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 partially shows an embodiment of the synthetic resin crown type cage according to the present invention. This embodiment includes a base 1 and a pillar 6 extending from the base 1 in the axial direction. The column portion 6 has ball holding claws 6a, 6a. A pocket 5 into which the ball 3 is fitted is formed between the pillar portions 6 and 6. This pocket 5 and pillar 6
Are arranged alternately in the circumferential direction. As shown in FIG. 2, a first grease storage recess 7 and a second grease storage recess 8 are formed between the pockets 5 and 5. The first grease storage recesses 7 and 8 are recessed from the end of the column 6 toward the base 1 and are sandwiched between the claw 6a and the claw 6a.

In the first grease accommodating recess 7, the pillar 6 is provided.
While there is a cylindrical protrusion 10 that axially projects from the second grease storage recessed portion 8, there is no projection that axially projects from the column portion 6. The projections 10 are formed on every other column portion 6 so that the first grease storage recesses 7 and the second grease storage recesses 8 are alternately arranged in the circumferential direction. Reference numeral 16 is a mountain-shaped projection for contacting the ball 3 fitted in the pocket 5 and supporting the ball 3 auxiliary.

The synthetic resin crown type cage having the above structure is shown in FIG.
As shown in, the ball 3 is fitted into the pocket 5. Then, the first and second grease storage recesses 7 and 8 are filled with grease 11. In addition, 12 is an inner ring, 13 is an outer ring, and 14 is a seal member.

According to this embodiment, in the initial stage of rotation, the grease 11 stored in the second grease storage recess 8 is then scattered on the track. Therefore, no defective lubrication occurs even in the initial stage of rotation, and the dispersed grease 1
According to 1, the initial lubrication of the bearing can be sufficiently performed. Moreover, since the grease 11 accommodated in the first grease accommodating recess 7 is still retained, the grease scattered on the track does not become excessive, dust is not generated, and the torque increases. There is no such thing.

After a predetermined period of time has passed after the rotation and all the grease 11 in the second grease storage recess 8 has been scattered,
Since the base oil exudes from the grease 11 held in the grease accommodating recess 7 into the track, lubrication can be performed thereby.

Therefore, according to this embodiment, the lubrication by the scattering of the grease from the second grease storage recess 8 at the initial stage of rotation and the base oil from the grease 11 in the rotating first grease storage recess 7 to the track. It is possible to perform both lubrication due to the bleeding of water, and it is possible to perform good lubrication for a long period of time while suppressing dust generation to a minimum and achieving low torque. Further, it is possible to prevent the grease from being excessively scattered at the time of high-speed rotation and prevent the grease from leaking.

Further, according to this embodiment, the grease retaining function of the first grease accommodating recess 7 and the grease scattering function of the second grease accommodating recess 8 are determined by the presence or absence of the protrusion 10 from the pillar 6. Can be realized. Since the protrusion 10 is a portion with which the extrusion pin abuts at the time of mold release after injection molding, the existence of the protrusion 10 does not cause a cost increase, and at a low cost, improvement of lubrication performance and generation of dust are prevented. And reduction can be realized.

In the above embodiment, the projections 10 are formed on every other pillar portion 6, but the projections 10 may be formed on only one pillar portion. Conversely, the projections 10 may be formed on one pillar portion. You may form in all the pillar parts except a part. By increasing or decreasing the ratio of the number of the second grease storage recesses 8 where the protrusion 10 is not present to the number of the first grease storage recesses 7 where the protrusion 10 is present, the ratio of the dust generation reduction value to the lubrication performance improvement value is increased. Can be increased or decreased.

Further, in the above embodiment, the first grease storage recess and the second grease storage recess are formed depending on the presence or absence of the protrusion 10. However, depending on the length of the protrusion 10, the first grease storage recess and the second grease storage recess are formed. May be formed.

[0023]

As is apparent from the above, the synthetic resin crown type cage according to the invention of claim 1 has a ball extending between the base portion having an annular shape in the axial direction and having a ball holding claw between the ball portions. And a first grease accommodating concave portion which is recessed from the end portion of the column portion toward the base side to easily retain grease and is less likely to be scattered during rotation, and an end portion of the column portion. And a second grease storage recessed portion that is recessed toward the base side and is hard to hold and easily scatters grease during rotation.

Therefore, according to the first aspect of the present invention, the lubrication due to the scattering of the grease from the second grease storage recess at the initial stage of rotation and the bleeding of the base oil from the grease in the first grease storage recess into the raceway during the rotation are performed. It is possible to perform both lubrication by means of the above, and it is possible to perform good lubrication for a long period of time while suppressing dust generation to a minimum and achieving a low torque. The lubrication performance of the bearing can be improved.

Further, it is possible to prevent the grease from scattering too much at the time of high speed rotation and prevent the grease from leaking.

According to a second aspect of the present invention, in the synthetic resin crown type retainer according to the first aspect, the first grease accommodating concave portion has a projection of a predetermined length extending axially from the column portion. The second grease storage recess has a protrusion shorter than the predetermined size, or does not have a protrusion.

Therefore, according to the invention of claim 2, the grease holding function of the first grease storing recess is
The grease scattering function of the second grease accommodating recess can be realized depending on the length of the protrusion from the column portion or the presence or absence thereof. In addition, the grease holding force and the amount of dispersed grease can be adjusted to desired values by adjusting the degree of length and the number ratio of presence or absence of protrusions.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view partially showing an embodiment of a synthetic resin crown type cage according to the present invention.

FIG. 2 is a diagram showing a structure of a main part of the above embodiment.

FIG. 3 is a diagram showing a state in which the above embodiment is viewed in the axial direction.

FIG. 4 is a cross-sectional view showing a state in which the above embodiment is incorporated in a bearing.

FIG. 5 is a schematic view showing a state in which a conventional synthetic resin crown type cage is viewed from the axial direction.

[Explanation of symbols]

1 ... Base, 3 ... Ball, 5 ... Pocket, 6 ... Pillar, 7 ... 1st
Grease storage recess, 8 ... Second grease storage recess, 10 ...
Protrusion, 11 ... Grease, 12 ... Inner ring, 13 ... Outer ring, 14
... Seal member.

Claims (2)

[Claims] 1. A pocket having a ring-shaped base portion and a plurality of pillar portions axially extending from the base portion and having ball-holding claws, wherein a pocket into which a ball is fitted is formed between the pillar portions. A formed synthetic resin crown-type cage, comprising: a first grease accommodating recessed portion that is recessed from the end of the pillar portion toward the base side and that easily holds grease during rotation and does not easily scatter; and the pillar portion. And a second grease accommodating recessed portion that is recessed from the end portion to the base portion side and is hard to retain and scatters grease during rotation, and is made of synthetic resin. 2. The synthetic resin crown type cage according to claim 1, wherein the first grease accommodating concave portion has a projection of a predetermined length extending axially from the column portion, The crown holder made of synthetic resin, wherein the second grease accommodating concave portion has a protrusion shorter than the predetermined size or does not have a protrusion.