JP3573866B2 - Synthetic resin cage - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a crown retainer made of synthetic resin, which improves lubrication performance of a bearing and reduces dust generation by grease lubrication.
[0002]
[Prior art]
Conventionally, as this type of synthetic resin crown type cage, there is one shown in FIG. In this retainer, pockets 51 into which balls are fitted and pillar portions 52 are formed alternately in the circumferential direction. The column portion 52 extends in the axial direction from an annular base (not shown). A projection 53 extending in the axial direction from the pillar 52 is present in the grease storage recess 56 recessed from the end of the pillar 52 to the base side between the pocket 51 and the pocket 51. I have. The projection 53 is a part that is pushed by the tip of the extrusion pin at the time of release after injection molding.
[0003]
By the way, grease for lubrication is sealed in the storage recess 56. The grease has a role of gradually oozing out the base oil during rotation and lubricating the bearing with the base oil. Further, the grease also has a role of scattering from the storage recess 56 to the friction portion at the initial stage of rotation to perform initial lubrication.
[0004]
[Problems to be solved by the invention]
However, if the concave portion 56 in which the projection 53 exists has too large a grease holding force, the amount of grease scattered from the concave portion 56 at the initial stage of rotation and sprayed on the balls and the raceway surface is insufficient, and the initial lubrication of the bearing is insufficient. There is a problem that occurs.
[0005]
On the other hand, when the projections 53 are eliminated, the grease holding force of the concave portion 56 is reduced, so that the scattering amount of the grease during rotation increases. Therefore, the initial lubrication of the bearing is sufficient, but there is a problem that dust generation increases. Further, there is also a problem that the torque required for rotation becomes large, and there is also a problem that grease leaks easily occur at high speed rotation.
[0006]
Accordingly, an object of the present invention is to provide a synthetic resin crown type cage capable of supplying a required amount of grease to a track for a long period of time from the initial stage and realizing reduction of dust generation and low torque. is there.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 has an annular base, and a plurality of pillars extending in the axial direction from the base and having ball holding claws. A synthetic resin crown type retainer in which a pocket into which a ball is fitted is formed,
A first grease housing recess that is recessed proximally from the end of the column portion with has a collision force that extends axially from the column portion,
Is characterized in that a second grease housing recess that is recessed proximally from the end of both the pillar portion when the axial length than the projections that have a short projection.
[0008]
According to the first aspect of the present invention, the grease stored in the second grease storage recess is scattered to the track at the beginning of rotation. Therefore, poor lubrication does not occur even at the beginning of rotation. Moreover, since the grease stored in the first grease storage recess remains held, the grease scattered on the track does not become excessive, dust is not generated, and the torque is not increased. Absent. After a predetermined period of time has passed after the rotation and all the grease in the second grease storage recess has scattered, the base oil oozes out from the grease held in the first grease storage recess into the raceway. it can.
[0009]
Therefore, according to the first aspect of the present invention, lubrication due to scattering of grease from the second grease storage recess at the beginning of rotation, and lubrication due to bleeding of base oil from the grease in the first grease storage recess during rotation to the track are achieved. Both can be performed, and good lubrication can be performed over a long period of time while minimizing dust generation and achieving low torque. The lubrication performance of the bearing can be improved.
[0010]
Further, it is possible to prevent the grease from scattering too much during high-speed rotation, thereby preventing grease from leaking.
[0011]
Further, the synthetic resin crown type cage of the invention of claim 1, the first grease housing recess has a collision force that extends axially from the column portion, the second grease storage recess above axial length than projections that have a short projection.
[0012]
In addition, the synthetic resin crown type retainer according to the second aspect of the present invention has a projection that extends in the axial direction from the column, and is recessed from the end of the column toward the base. It has a grease storage recess, and a second grease storage recess which has no projection and is recessed from the end of the pillar toward the base.
According to the first and second aspects of the invention, the grease holding function of the first grease storage recess and the grease scattering function of the second grease storage recess are realized by the length of the projection from the pillar or the presence or absence thereof. be able to. Further, by adjusting the length and the number ratio of the presence or absence of the protrusion, the grease holding force and the grease scattering amount can be adjusted to desired values.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
[0014]
FIG. 1 partially shows an embodiment of a synthetic resin crown type retainer of the present invention. This embodiment includes a base 1 and a column 6 extending from the base 1 in the axial direction. The pillar portion 6 has ball holding claws 6a. A pocket 5 into which the ball 3 is fitted is formed between the pillars 6. The pockets 5 and the pillars 6 are alternately arranged 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. The first grease storage recesses 7 and 8 are recessed from the end of the pillar 6 toward the base 1 and are sandwiched between the claws 6a.
[0015]
The first grease housing recess 7 has a columnar projection 10 projecting from the column 6 in the axial direction, while the second grease housing recess 8 has a projection projecting in the axial direction from the column 6. Does not exist. The protrusions 10 are formed at 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 denotes a mountain-shaped projection for assisting the ball 3 in contact with the ball 3 fitted in the pocket 5.
[0016]
In the synthetic resin crown type retainer having the above configuration, the ball 3 is fitted into the pocket 5 as shown in FIG. 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 sealing member.
[0017]
According to this embodiment, the grease 11 stored in the second grease storage recess 8 is scattered to the track at the beginning of rotation. Therefore, the lubrication failure does not occur even at the beginning of rotation, and the grease 11 scattered can sufficiently perform the initial lubrication of the bearing. In addition, the grease 11 stored in the first grease storage recess 7 remains held, so that the grease scattered on the track does not become excessive, no dust is generated, and the torque increases. Never.
[0018]
Further, after a predetermined period of time has passed after the rotation, all the grease 11 in the second grease storage recess 8 has been scattered, so that the base oil oozes out of the grease 11 held in the first grease storage recess 7 into the track. Can be lubricated.
[0019]
Therefore, according to this embodiment, lubrication due to grease scattering from the second grease storage recess 8 at the beginning of rotation and bleeding of base oil into the orbit from the grease 11 in the first grease storage recess 7 during rotation. , Lubrication over a long period of time while minimizing dust generation and reducing torque. Further, it is possible to prevent the grease from scattering too much during high-speed rotation, thereby preventing grease from leaking.
[0020]
Further, according to this embodiment, the grease holding function of the first grease storage recess 7 and the grease scattering function of the second grease storage recess 8 can be realized by the presence or absence of the protrusion 10 from the column 6. Can be. Since the projection 10 is a portion where the extrusion pin comes into contact at the time of mold release after injection molding, the presence of the projection 10 does not cause a cost increase, and at a low cost, the lubrication performance is improved and dust generation is improved. Reduction can be realized.
[0021]
In the above-described embodiment, the projections 10 are formed every other column 6. However, the projections 10 may be formed only in one column. You may form in all the pillar parts. By increasing or decreasing the ratio of the number of the second grease accommodating recesses 8 where the projections 10 do not exist to the number of the first grease accommodating recesses 7 where the projections 10 exist, the ratio of the dust generation reduction value to the lubrication performance improvement value is increased. Can be increased or decreased.
[0022]
Further, in the above embodiment, the first grease housing recess and the second grease housing recess are formed depending on the presence or absence of the protrusion 10, but the first grease housing recess and the second grease housing recess are formed depending on the length of the protrusion 10. You may.
[0023]
【The invention's effect】
As is apparent from the above description, in the synthetic resin crown type retainer according to the first aspect of the present invention, the ball is fitted between the pillar portions extending in the axial direction from the annular base and having the ball holding claws. A pocket is formed, a first grease storage recess that is recessed from the end of the pillar portion to the base side to easily hold grease during rotation, and is hardly scattered, and a recess from the end portion of the pillar portion to the base side. And a second grease storage recess which is difficult to hold the grease during rotation and is easy to scatter.
[0024]
Therefore, according to the first aspect of the present invention, lubrication due to scattering of grease from the second grease storage recess at the beginning of rotation, and lubrication due to bleeding of base oil from the grease in the first grease storage recess during rotation to the track are achieved. Both can be performed, and good lubrication can be performed over a long period of time while minimizing dust generation and achieving low torque. The lubrication performance of the bearing can be improved.
[0025]
Further, it is possible to prevent the grease from scattering too much during high-speed rotation, thereby preventing grease from leaking.
[0026]
Also, in the synthetic resin crown type cage of the invention of claim 1, the first grease housing recess has a collision force that extends from the pillar portion in the axial direction, the second grease accommodating recess than the protrusion axial length that have a short projection.
Further, in the synthetic resin crown type retainer according to the second aspect of the present invention, the second grease accommodating recess has no projection.
[0027]
Therefore, according to the first and second aspects of the present invention, the grease holding function of the first grease storage recess and the grease scattering function of the second grease storage recess are determined by the length of the projection from the pillar or the presence or absence of the grease. Can be realized. Further, by adjusting the length and the number ratio of the presence or absence of the protrusion, the grease holding force and the grease scattering amount can be adjusted to desired values.
[Brief description of the drawings]
FIG. 1 is a partial sectional view partially showing an embodiment of a synthetic resin crown type retainer of the present invention.
FIG. 2 is a diagram showing a structure of a main part of the embodiment.
FIG. 3 is a diagram showing a state in which the embodiment is viewed in an axial direction.
FIG. 4 is a cross-sectional view showing a state where 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 retainer is viewed from an axial direction.
[Explanation of symbols]
1 ... base, 3 ... ball, 5 ... pocket, 6 ... pillar,
7: first grease storage recess, 8: second grease storage recess, 10: projection,
11: grease, 12: inner ring, 13: outer ring, 14: sealing member.

Claims (2)

A composite having an annular base and a plurality of pillars extending in the axial direction from the base and having ball holding claws, and a pocket into which the ball is fitted is formed between these pillars. A crown-type resin cage,
A first grease housing recess that is recessed proximally from the end of the column portion with has a collision force that extends axially from the column portion,
Synthetic resin, characterized in that a second grease housing recess that is recessed proximally from the end of both the pillar portion when that has a short projection axial length than the projection Crown type cage. A composite having an annular base and a plurality of pillars extending in the axial direction from the base and having ball holding claws, and a pocket into which the ball is fitted is formed between these pillars. A crown-type resin cage,
A first grease storage recess having a protrusion extending in the axial direction from the column and being recessed from the end of the column toward the base;
A synthetic resin crown-shaped retainer having a second grease storage recess having no projection and being recessed from the end of the pillar to the base.

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