JPH02217620A - Rolling bearing - Google Patents

Abstract

PURPOSE:To provide a holder with a force to draw grease so as to make it possible to enhance lubricity at low cost by causing the end portion of the holder in its axial direction to protrude from the end face of an orbital ring, and forming the opposite face of the orbital ring as a taper-shaped face tilted toward inside along the axial direction. CONSTITUTION:On a taper-shaped face 5b provided on the outer peripheral face of the holder 5, when a holder 5 is rotated, the speed of the inside of the large diameter of the taper becomes higher than that of both end portions 5a, 5a located on the outside, so that grease in the vicinity of the face 5b is rotated at higher speed on the inside than in the holder 5a, 5a. Also, because a centrifugal force caused by rotation of the holder 5 acts on the grease attached to the face 5b, the grease moves along the inclination of the face 5b and is forced into the bearing 1. In a spiral channel 8 which has a lead in its axial direction, rotation of the holder 5 causes the grease to be transmitted along the lead so that pumping action takes place by which the grease is forcibly moved in the axial direction of the bearing 1.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to rolling bearings, and more specifically, to a lubrication system that improves lubricity by forcibly drawing grease from grease reservoirs provided on both sides of the bearing into the inside of the bearing. It's about structure.

(Prior Art) FIG. 6 shows a bearing in a conventional traction motor for a vehicle.

In the bearing 20 installed between the rotating shaft 12 and the housing (bearing box) 13, the rolling elements 4 of circular rollers interposed between the inner ring 2 and the outer ring 30 are held by a synthetic resin or metal holder 821. A cylindrical roller bearing is used, and this bearing 20
is prevented from being pulled out in the axial direction by a sealing cover 14.15 fitted into the housing 13. Grease reservoirs 10, 11 are formed on both sides of the bearing 20, and lubricating grease is sealed in these reservoirs to eliminate lubrication during long-term operation.

[Problem to be solved by the invention]

By the way, standard rolling bearings do not have a mechanism to draw grease from both sides into the bearing, so the rotating shaft 12 actually
Even when the bearing rotates, the end faces of the inner ring 2 and retainer 21 and the grease in the grease reservoir 10.11 simply come into contact and move relative to each other, and the grease hardly moves inside the bearing.
The drawback was that most of it remained unused.

Therefore, the present invention aims to provide a rolling bearing with excellent lubricity at low cost by adding a device to the cage and giving it a force to draw in grease.

[Means to solve the problem]

above! ! ! In order to solve the problem, the present invention makes the axial end of the cage protrude outward from the end surface of the bearing ring, and the surface of the cage that faces the bearing ring is turned inward from the end. A structure with a tapered surface in the axial direction was adopted to increase the diameter.

In addition to the above structure, a groove in which a predetermined lead exists may be formed in the tapered surface of the cage.

In addition, in the above structure, on the inner peripheral surface of the column part of the cage,
A tapered surface may be provided that is inclined in the axial direction in a direction in which the inner side has a larger diameter.

[Effect]

In the above structure, when the retainer 2 rotates together with the rolling elements, on the tapered surface of the retainer, the speed on the inner side, which has a larger diameter, is higher than at both ends, which have a smaller diameter. Therefore, the grease attached near the inside of the tapered surface rotates faster than the grease near both ends, and the grease moves from the outside to the inside. Also, as the cage rotates, the grease attached to the tapered surface rotates faster than the grease near both ends. centrifugal force acts, and a force acts inward along the inclination of the tapered surface. Due to these actions, as the bearing rotates, grease flows from the end of the cage that protrudes into the grease reservoir into the tapered shape of the cage. It moves sequentially along the surface and is drawn into the inside of the bearing.

On the other hand, if a groove with a lead is provided on the tapered surface, a pumping action will occur within the groove that moves the grease in the axial direction along the lead, forcing more grease into the bearing. Can be done.

Furthermore, by forming a tapered surface on the inner circumferential surface of the columnar portion of the cage, the grease moving along the cage can be drawn further into the bearing.

〔Example〕

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

The structure of the bearing section of the embodiment shown here is the same as the structure described in the prior art, and the same parts are given the same reference numerals and the explanation will be omitted.Here, the characteristic parts will be explained.

FIG. 1 shows a first embodiment, in which a cage 5 has both end portions 5a, 5a protruding outward from both end surfaces of the inner ring 2 and outer ring 3 and entering the inside of a grease reservoir 10.11. . The outer peripheral surface of the retainer 5 facing the outer ring 3 has both ends 5a,
The tapered surface 5b is inclined in the axial direction so that the inner diameter becomes larger toward the inside from the bearing 1, and as shown in FIG. A large number of spiral grooves 8 with a predetermined lead relative to the axis
is formed.

In addition, a pocket S for holding the rolling element 4 with the above-mentioned holding ratio of 2:5 is provided.
In this case, a large axial clearance is provided with respect to the rolling elements 4, and when the rotating shaft 12 rotates, the holding member 2S5 is thick in the axial direction (one movement).

, the embodiment has the above structure, and when the cage 5 rotates, the tapered surface 5b on the outer peripheral surface of the cage 5
Since the speed on the inside of the large diameter is higher than on both outer ends 5a, 5a, the grease near the tapered surface 5b rotates faster on the inside than on both ends 5a, 5a of retainer 5. Therefore, from both ends 5a, 5a of the retainer 5 that has entered the grease in the grease reservoir 10.11, the tapered surface 5b
The grease is drawn into the inside of the bearing 1 along.

Furthermore, since centrifugal force due to the rotation of the cage 5 acts on the grease attached to the tapered surface 5b, the grease moves along the slope of the tapered surface 5b and is drawn into the bearing 1.

Further, in the spiral groove 8 having a lead in the axial direction, when the retainer 5 rotates, a pumping action occurs in which the grease is sent along the lead and forcibly moves the bearing 1 in the axial direction.

In this case, since the spiral grooves 8 are formed with the same inclination in all the grooves of the tapered surface 5b, when the direction of rotation of the rotating shaft 12 changes, the direction of movement of the grease also changes. That is,
When the retainer 5 rotates in the normal direction, the grease moves from the grease reservoir 10 on the right side toward the left side along the spiral groove 8. When the retainer 5 rotates in the reverse direction, the drawing direction of the spiral groove 8 is reversed, and the grease moves toward the left side. is the grease reservoir 11 on the left side
Move towards the right side. Since the trough cylinder motor of a vehicle is used by repeating forward and reverse rotation, the grease in the grease reservoirs 10 and 11 on both sides of the bearing 1 circulates with each other due to the above action and is effectively used within the bearing. .

In addition, in the above structure, the axial clearance between the pocket S of the retainer 5 and the rolling body 4 is increased so that the retainer r&5 rotates thickly in the axial direction at JgfJ+L, so that the retainer 5 is free from grease. It functions to stir the grease in the reservoirs 10 and 11, and has the effect of promoting the movement of the grease from side to side.

FIG. 3 shows a second embodiment. In this bearing 1', the inner circumferential surface of the retainer 6 facing the inner ring 2 is connected to both ends 6a.
, 6a are formed into tapered surfaces 6b, 6b which are inclined inwardly so as to have a larger diameter.

In this structure, as described in the previous embodiment, the retainer 6
The grease in the grease reservoir 10.11 is drawn into the inside of the bearing 1' along the tapered surfaces 6b, 6'b of the inner peripheral surface of the bearing 1'. In the above, a spiral groove 8 as shown in FIG. 2 may be formed on the tapered surface 6b.

FIG. 4 shows a third embodiment. In this bearing 1'', the outer circumferential surface and the inner circumferential surface of the retainer 7 are opposite ends 7a, respectively.
Tapered surfaces 7b, 7 that slope inward from 7a.
It is formed in C. Further, tapered surfaces 7d, 7d are formed on the inner circumferential surface of the columnar portion of the cage 70, and the tapered surfaces 7d are inclined to have a larger diameter toward the inner side in the axial direction. The tapered surfaces 7d, 7d are symmetrical with respect to the axial center of the bearing 1#.

Furthermore, tapered surfaces 3a, 3a are formed on the inner circumferential surface of the flange portion of the outer ring 3, the diameter of which increases toward the inside in the axial direction.

The inclination angle of this tapered surface 3a is set such that the distance 16 between the outer circumferential surface of the cage 7 and the tapered surface 7b becomes smaller from the outside to the inside, and the cage 7 is set relative to the outer ring 3. When the retainer 7 rotates, the difference in speed of the grease that occurs along the tapered surface 7b of the outer peripheral surface of the retainer 7 causes a pumping action that draws the grease inward.

In the above structure, grease pools 10 on both sides of the bearing 1 are formed along the tapered surfaces 7b and 7C of the inner and outer peripheral surfaces of the cage 7.
Grease is drawn into the bearing 1″ from 11, and
The grease drawn along the inner circumferential surface of the retainer 7 is further drawn inside the bearing 1'' along the tapered surfaces 7d, 7d of the columnar portions, and lubricates the inside of the bearing 1''.

On the other hand, in the example shown in FIG. 5, tapered surfaces 13a and 14 extending to tapered surfaces 3a and 3a of the outer ring 3 collar are provided on the inner peripheral surfaces of the housing 13 and the seal 114 that form the grease reservoirs 10 and 11.
It is formed by a.

When formed in this way, the grease forms on the tapered surface 3a.

The force can be more smoothly transferred into the bearing along lines 13a and 14a.

Note that the tapered surface of each of the above-mentioned embodiments has a linear shape of 11
11.4 is shown in the figure, but it can also be formed with a curved slope.

Further, the grooves that provide a pumping effect on the inner or outer circumferential surface of the cage may be a spiral threaded groove in addition to the spiral groove 8 shown in FIG. 2.

Further, in the above embodiment, a rolling bearing is shown in which the outer ring 3 is provided with a flange, but the present invention can also be applied to a bearing in which the inner ring 2 is provided with a flange.

In addition to the illustrated cylindrical roller bearing, the present invention can be similarly applied to other rolling bearings including a cage such as ball bearings.

(Effects of the Invention) As explained above, the present invention makes the end of the cage protrude into the grease reservoir, and also makes the surface of the cage facing the raceway axis inclined in a tapered shape, so that the tapered surface Since the grease in the grease reservoir is drawn into the bearing inside the bearing along the bearing, it has the effect of improving lubricity and extending the life of the bearing.

Furthermore, if a groove with an axial lead is provided on the opposing surface of the cage, the groove acts as a pump, allowing a large amount of grease to be forcibly moved, resulting in high lubrication performance.

Furthermore, if a tapered surface is provided on the inner circumferential surface of the columnar portion of the cage, the grease can be more efficiently drawn into the bearing to lubricate the rolling elements, which has the effect of extending the life of the bearing.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional side view showing the rolling bearing and mounting structure of the embodiment, Fig. 2 is a perspective view showing the main parts of the same, Fig. 3 is a longitudinal cross-sectional side view of the second embodiment, and Fig. 4 is a longitudinal cross-sectional side view showing the rolling bearing and mounting structure of the embodiment. FIG. 5 is a longitudinal side view of the third embodiment, FIG. 5 is a longitudinal side view of another embodiment, and FIG. 6 is a longitudinal side view of the conventional structure. 1.1', 1''...Rolling bearing, 2...
・Inner ring, 3... Outer ring, 4...
・Rolling element, 5.6,? ...Retainer, 5
b, 6b, 7b, 7c, 7d...-Taber shaped surface, 8...Spiral pattern, 10.11...Grease reservoir.

Claims (3)

[Claims] (1) In a rolling bearing in which the rolling elements interposed between the inner ring and the outer ring are held by a cage, the axial end of the cage is made to protrude outward from the end face of the bearing ring, and the bearing ring of the cage is A rolling bearing characterized in that opposing surfaces are tapered surfaces that are inclined in the axial direction so that the inner diameter becomes larger toward the inner side from the end portion. (2) The rolling bearing according to claim 1, wherein a groove having a predetermined lead is formed on the tapered surface of the retainer. (3) Claim (1) or (2) characterized in that the inner circumferential surface of the column portion of the cage is formed with a tapered surface that is inclined in the axial direction so that the inner diameter becomes larger toward the inside. ).