DE2302260A1 - ROLLER BEARING - Google Patents

Description

January 18, 1973 My files: h 8u-j, DT

Fritz Haug AG, 9015 St. GaIlen-Winkelη {Switzerland)

roller bearing

The invention relates to a grease-lubricated roller bearing for Connecting rod bearing on the crankshaft journal of reciprocating piston engines with a solid cage made of material with a low coefficient of friction, wherein the cage has bearing openings that are open to the inner and outer rings for holding the rolling elements.

In small compressors it is already known through use to achieve dry running of the machine from grease-lubricated closed roller bearings at the main and connecting rod bearing points. The area of application of the known bearings, which are usually riveted or welded ball-guided sheet metal cages or have plastic cages guided on the inner ring or on the outer ring, but is limited. With increasing eccentricity the bearing point of larger bearings or at increasing speeds, the centrifugal forces acting on the bearing decrease in such a way that short-term overheating and destruction of the bearing can be observed. The use of fatty

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For this reason, lubricated rolling bearings have so far been used on small machines limited.

The invention is based on the object of avoiding the disadvantages of the known rolling bearings, in particular one that is lubricated with grease To create rolling bearings which can be used as a connecting rod bearing even when large centrifugal forces occur.

According to the invention, this object is primarily thereby achieved solved that the distance of the outer diameter of the cage from the inner diameter of the outer ring or the distance of the The inner diameter of the cage from the outer diameter of the inner ring is greater than the rolling element clearance in the cage bearing openings, and that in each rolling element bearing opening at least a space is provided for receiving a supply of fat. While in known constructions it is apparently essential was considered to lead the cage to absorb the centrifugal forces on the inner or outer ring of the rolling bearing, the invention thus provides the exclusive cage guidance through the rolling elements, it has been shown that the given task only in combination with the additional Arrangement of fat storage spaces accessible in every storage opening is.

In addition, it has been shown that, surprisingly despite the fact that the cage is guided by the rolling elements, the use of elastic material even with high load surges and centrifugal forces using rigid cages

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is far predominant. It is particularly advantageous if the cage material and the wall thickness of the cage between the Bearing openings are designed such that fit tolerances of the individual rolling elements in the bearing openings are compensated so that pressure peaks and load fluctuations through the cage evenly all rolling elements are passed on.

In the case of cylindrical or conical rolling elements, in particular, it has proven useful if on the cover part and the comb part, respectively Bearing knobs for approximately punctiform lateral support of the Rolling bodies and are provided to create the fat absorption space.

With ball bearings, low-friction lateral support can be used It is particularly easy to ensure that the bottom of the bearing openings in the comb part and the cover part are flat are. The fat absorption space can be constructed in a constructive manner Make it particularly easy to manufacture if the bearing openings for the balls are each cylindrical are and finished flat by the comb part — bottom and cover part be, and if in each case by the cylinder wall and cover part or comb part bottom on the one hand and through the ball on the other hand, limited space is provided for receiving the fat supply. This arrangement also ensures that that the fat absorption space is right next to it the ball bearing rests, so that excellent lubrication is guaranteed.

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Instead of the flat design of the lid part and the base of the comb part For lateral support of the balls, conical depressions can also be provided there, in which the Balls are supported in a circular ring. Two grease absorption spaces are formed by the ball and cylinder wall, -welehe also ensure reliable lubrication,

To improve the lubricating effect, you can also use the the cylindrical walls of the bearing openings in each case next to the contact line with the introduced ball annular Recesses can be provided for absorbing fat.

Such annular depressions for receiving grease can advantageously also be used in cylindrical or tapered roller bearings Find.

While the choice of material for the plastic cage is known fully lubricated rolling bearings so far primarily on ensuring low weight and sufficient Strength and (a prerequisite for such bearings. Full lubrication) a low coefficient of friction was, it was determined according to the invention that moreover the abrasion resistance of the plastic is of increased importance.

It has been shown that it is particularly advantageous to use polyamide, in particular polyamide 6.6, as the cage material can find, which also reduces the running noise.

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Overall, the technical progress and the inventive content of the application subject both by the claimed Individual features as well as, in particular, guaranteed by the combination of the following features:

a) The cage comb part consists of a solid ring Polyamide 6.6, on which to close the machined rolling element bearing openings annular cover part is attached;

b) the fit tolerance of the rolling elements in the bearing openings is smaller than the change in distance between the cages caused by the elasticity of the cage under load Rolling elements;

c) the cage is ball-guided at a distance from the inner and outer ring;

d) in each rolling element bearing opening is between the ball bearing surface and the lateral ball guide through the bottom of the comb or cover part provided at least one fat receiving space.

The invention is explained in more detail below in exemplary embodiments with reference to the drawings. Show it:

1 shows the schematic representation of a roller bearing with the features of the invention in section,

FIG. 2 shows the cage according to FIG. 1 in partial section,

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3 shows the representation of a cage with the features of the invention and

4-6 respectively modified exemplary embodiments for rolling element receiving openings.

As shown, the rolling elements 1 of a rolling bearing in guided cylindrical bearing openings 2 of the cage 3 of a roller bearing. The balls 1 run between the outer ring 4 and Inner ring 5. The rolling elements 1 are arranged in the receiving openings 2 with such a small fit that the cage reliable distance from the inner diameter of the outer ring 4 or from the outer diameter of the inner ring 5 holds. As material for the cage 3 polyamide 6.6 is chosen, which is at good strength, low coefficient of friction and high abrasion resistance having. The fit tolerances of the receiving openings 2 and the rolling elements 1 are selected in such a way that that they are compensated by the material elasticity. The dimensionally accurate production of the receiving openings 2 is achieved by machining, e.g. drilling or milling.

As can be seen from Figure 2, the receiving opening has a conical recess 6 through which the rolling elements 1 is guided laterally in a circular ring. To the point— shaped guide on the opposite side of the rolling element, comb part 3a of cage 3 is closed by cover part 3b. Both in space 7 between the spherical and conical point as well as in the spaces 8, 9, which are located directly on the running surface

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are adjacent, a remaining supply of grease can be deposited, which is in the immediate vicinity of the rolling elements — friction — exercise areas and ensures reliable running.

Figure 4 shows a modified embodiment of a cylindrical Receiving opening 2, where for enlargement of the space available for the grease supply in the immediate vicinity of the running surface 10 annular recesses 11 are provided in the cylinder wall.

FIG. 5 shows a comb part 3a made of elastic polyamide, in which the receiving openings 2 are designed in a pan-shaped manner are that after the introduction of the rolling elements 1 with temporary deformation of the elastic material reliable Rolling element holder is guaranteed without a cover part. In this case, according to the invention, is also used to take up the fat supply an annular recess 11 is provided directly next to the running surface 10 of the rolling element 1.

While Figures 1-5 roller bearings with spherical rolling elements show, is in the receiving opening 2 according to Figure 6 a cylindrical Rolling elements arranged. The side retention is achieved by bearing knobs 12, which are located on the bottom of the comb part 3a or on the cover part 3b are provided. Both the ring-shaped recesses serve to hold the grease supply 11 as well as the one through the knobs 12 between the comb part 3a or Cover part 3b ü ~ .d rolling elements fixed space 13. The cage part 3a consists of metal, while the receiving opening 2

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by means of a rotationally symmetrical axis exnbred in bore 14 Plastic insert 15 is enclosed.

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Claims (16)

Claims [I.) Grease-lubricated rolling bearings for connecting rod bearings on the crankshaft journal of reciprocating piston machines with a solid cage made of material with a low coefficient of friction and high strength, the cage having bearing openings open to the inner and outer ring for receiving the rolling elements, characterized in that the The distance between the outer diameter of the cage (3) and the inner diameter of the outer ring (4) or the distance between the inner diameter of the cage (3) and the outer diameter of the inner ring (5) is greater than the rolling element plate in the cage bearing openings (2), and that in each storage opening at least one space (7, 8, 9, 11, 13) is provided for receiving a supply of fat. 2. Rolling bearing according to claim 1, characterized in that the cage (3) consists of elastic material, and that the cage play to the outer or inner ring (4 or 5) is greater than the sum of the absolute play between cage (3) and rolling elements (1) as well as that which occurs under load and which results from the elasticity of the cage There is play in the rolling elements (1) in the cage bearing openings (2). 3. Rolling bearing according to claim 2, characterized in that the cage material and wall thickness of the cage (3) between the Lageröffnurigen (2) are designed in such a way that for 309884/0944 ? ^ Π Ensuring even power transmission the cage (3) on all rolling elements (1) fit tolerances between rolling elements and bearing openings the cage elasticity, are compensated. 4. Rolling bearing according to claim 3 in comb design, characterized in that that the rolling elements (1) are in the bearing openings gene (2) through the bottom of the comb part (3a) on the one hand and the cover part (3b) on the other hand laterally are. 5. Rolling bearing according to claim 4 with cylindrical or conical rolling elements (1), characterized in that .that bearing knobs on each cover and comb part (3a, 3b) (12) for approximately punctiform, central support of the Rolling bodies (1) and to create the grease absorption space are provided. 6. Rolling bearing according to claim 4 with spherical rolling elements, characterized in that to ensure a point or line-shaped lateral ball guide of the Bottom of the bearing openings (2) in the comb part (3a) and the Lid part (3b) are flat. 7. Rolling bearing according to claim 6, characterized in that the bearing openings (2) for the balls (1) are each cylindrical are and by the comb part bottom (3a) and cover part (3b) flat v / ground, and that each 309884/0944 through the cylinder wall and cover part (3b) or comb part bottom (3a) on the one hand and by the ball (1) on the other hand limited space (9) for receiving the fat supply is provided. 8. Rolling bearing according to claim 6, characterized in that »that the bearing openings (2) for the balls (1) are each cylindrical 5 that the comb part bottom (3a) and / or cover part (3b) are each conical depressions formed in this way (G) have that the balls (1) are laterally supported in the shape of a circular ring, and that in each case the by the lateral circular lines of contact and the tip of the conical depressions on the one hand and the sphere on the other hand limited space (7) as well as by the lateral lines of contact and the middle line of contact (10) of the ball with the cylinder wall on the one hand and the ball on the other hand limited space (8) is provided for receiving the fat supply. -9. Rolling bearing according to claim 6 with cylindrical bearing openings in the comb part, characterized in that at least on one side immediately next to the middle calm Approximation line (10) of the ball with the cylinder wall in the latter annular recesses (11) for grease absorption are provided. 10. Rolling bearing according to claim 4 or 5 with cylindrical or conical rolling elements as well as with cylindrical or 309 & 34/0944 : - 12 - wedge-shaped bearing openings in the comb part, characterized in that that in the bearing wall at least one annular recess (11) is provided for absorbing grease is, 11. Rolling bearing according to one of the preceding claims, characterized characterized in that the comb part (3a) consists of an annular plastic part with cylindrical rolling element bearing openings (2) exists, on which one for the lateral support of the introduced rolling elements (1) annular cover part (3b) is glued. 12 »Rolling bearing according to claim 11, characterized in that the cage (3) made of abrasion-resistant plastic with a low There is a coefficient of friction. 13 »Rolling bearing according to claim 11, characterized in that the cage (3) is made of plastic-coated metal consists* 14 * Rolling bearing according to claim 12 or 13, characterized in that that the plastic is polyamide. 15 »Rolling bearing according to claim 14, characterized in that that-the plastic is polyamide G.6 » 16. Rolling bearing according to claim 1 with spherical rolling bodies and cylindrical bearing openings, characterized by 309884/0944 ' the combination of the following features: a) The Käf ig-Kammte.il (3a) consists of a solid ring made of polyamide 6.6, on which to close The machined rolling element bearing openings (2) are attached to an annular cover part (3b) is; b) the fit tolerance of the rolling elements (1) in the bearing openings (2) is smaller than that due to elasticity of the cage (3) when the load changes between the rolling elements; c) the cage (3) is ball-guided at a distance from the inner and outer ring (A, 5); d) in each rolling element bearing opening (2) is between the ball running surface (10) and the lateral ball guide through the comb part bottom or cover part (3a, 3b) at least one fat absorption space is provided. 3 Ü 9 b; U / ü 9 4 4