JP2000240645A - Thrust bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise the roller mounting efficiency of a holder so as to be usable also for high pressure with a small size by circumferentially arranging a plurality of lines of rollers in the holder, and increasing the number of rollers of each line from the inner side toward the outer side. SOLUTION: An outer side holding member 1 has a plurality of holding parts for cylindrical rollers 3a, and the holding part is curved on both side surfaces so that the cylindrical rollers 3a can be inserted and held from the outer side. An inner side holding member 5 is set on the inside of the holding member 1 with substantially the same outer diameter as the inside diameter of the holding member 1, and a plurality of holding parts for cylindrical rollers 3b are also formed on the holding member 5. Both edges of the cylindrical rollers 3a and 3b are C (linearly)-chamfered or R (radially)-chamfered, a plurality of screw bores are provided on a roller dropping-out preventing ring 9, and the ring 9 is fixed to the holding member 1 by a screw. Accordingly, a larger number of cylindrical rollers can be set in the outer side holding member 1 so as to be resistant to a large thrust load. The roller holding part can be worked every holding member of each line, and the mounting efficiency of rollers can be easily enhanced so as to be usable also to high pressure with a small size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust bearing under high pressure, and more particularly to a thrust bearing used in a narrow space where the outer diameter of the bearing is limited.

[0002]

2. Description of the Related Art FIG. 23 is an explanatory view of a conventional cylindrical roller type thrust bearing. In the figure, 100 is a cage,
101a and 101b are cylindrical rollers rotatably accommodated in the retainer 100, and 103 is a roller drop prevention ring.

[0003] The retainer 100 having the above configuration is similar to that shown in FIG.
As shown in the figure, the notches 105 for accommodating the cylindrical rollers are processed from the outer peripheral surface side of the ring-shaped member toward the center in the radial direction, and two cylindrical rollers are arranged in each of the notches 105 to form a whole. Two-row arrangement (in FIG. 23, cylindrical roller 101a
Is an outer row, and the cylindrical roller 101b is an inner row.

[0004]

In the conventional cylindrical roller thrust bearing, a notch 105 for accommodating the roller is formed from the outer peripheral surface side of a single cage, and this notch 1 is formed.
05 is configured to accommodate cylindrical rollers, and the roller arrangement is inevitably the same number on the inner and outer circumferences of the cage.

[0005] Therefore, the roller mounting efficiency of the cage cannot be increased, and the diameter of the cage must be increased in order to increase the thrust load resistance. Therefore, there is a problem that the bearing cannot be used in a narrow space where the outer diameter of the bearing is limited.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to obtain a compact thrust bearing which can be used even under high pressure by increasing the roller mounting efficiency of the cage.

[0007]

A thrust bearing according to the present invention comprises a cage in which a plurality of rollers are arranged in a circumferential direction in a cage, and the number of rollers in each row in the cage is changed from an inner peripheral side to an outer peripheral side. That's a lot.

Further, the retainer is characterized in that a plurality of retaining members for retaining the rollers for each row are connected in a radial direction.

Further, the roller holding portion of the holding member is formed by a notch portion cut radially from the circumferential surface side of the holding member, and the opening of the notch portion on the circumferential surface side is defined by the circumferential surface of the holding member. It is characterized by being closed.

[0010] Further, the plurality of holding members are screwed and connected to screw holes machined across adjacent holding members.

Further, the roller has shaft portions at both ends, and the retainer is formed by stacking two holding members each having a hole for accommodating the roller and grooves on both sides of the hole. The shaft of the roller is held by a hole formed by the groove.

Further, the retainer is formed by stacking a roller receiving hole and two holding members having a flange in the receiving hole, and by overlapping the holding members, the roller is formed by an enclosure formed by the flange. Is held.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 2 is a front view of a thrust bearing according to one embodiment of the present invention, and FIG.
Is a sectional view taken along the line AA in FIG. 2, and FIG. 3 is a perspective view of a part of the thrust bearing. First, the configuration of the present embodiment will be outlined based on FIGS. 1 to 3, reference numeral 1 denotes a ring-shaped outer peripheral holding member that holds an outer row of cylindrical rollers, 3 a denotes an outer cylindrical roller that is rotatably held by the outer holding member 1, and 5 denotes an outer holding member 1. The ring-shaped inner peripheral side holding member 3b arranged inside the inner peripheral side is an inner peripheral side cylindrical roller rotatably held by the inner peripheral side holding member 5.

Reference numeral 7 denotes a hexagon socket set screw for connecting the outer peripheral side retainer 1 and the inner peripheral side holding member 5. The set screw 7 is screwed into a screw hole 10 (see FIG. 3) machined across the outer holding member 1 and the inner holder 5. Reference numeral 9 denotes a roller drop prevention ring provided on the outer peripheral side of the outer peripheral holding member 1, and reference numerals 11 and 13 denote inner ring portions and outer ring portions provided on the inner ring side and the outer ring side, respectively, with the cylindrical rollers 3a and 3b interposed therebetween.

Next, the details of each component will be described based on the component drawings. FIG. 4 is a plan view of the outer peripheral side holding member 1, and FIG. 5 is a front view. As shown in FIGS. 4 and 5, the outer peripheral side holding member 1 is formed with a plurality of (in this example, 17) holding portions 1 a for holding the cylindrical rollers. The holding portion 1a is formed so that both side surfaces are curved, and has a configuration in which a cylindrical roller can be inserted and held from the outer peripheral side.

FIGS. 6 and 7 are a plan view and a front view of the inner peripheral side holding member 5, respectively. Since the inner peripheral holding member 5 is installed inside the outer peripheral holding member 1, the outer diameter thereof is formed to be substantially the same as the inner diameter of the outer peripheral holding member 1. Note that the inner peripheral side holding member 5 is also provided with a plurality of (12 in this example) holding portions 5a for holding the cylindrical rollers similarly to the outer peripheral side holding member 1.

FIGS. 8 and 9 are a front view and a side view, respectively, of the cylindrical roller 3a. The cylindrical roller 3a is formed of a cylindrical body, and has a C-chamfer (linear shape) or an R-chamfer (R-shaped fillet) on both edges. The cylindrical roller 3b has the same shape.

FIG. 10 is a plan view of the roller stopper ring 9.
FIG. 11 is a front view of the roller falling prevention ring 4. As shown in FIG. 11, the roller drop prevention ring 9 is provided with a plurality of screw holes 9a. By screwing a screw into the screw hole 9a, the roller fall prevention ring 9 and the outer periphery holding member 1 are formed.
Is fixed. Further, a cylindrical pin or a tapered pin may be press-fitted instead of the screw.

In the thrust bearing of the present embodiment configured as described above, the outer peripheral side holding member 1 has
Seven cylindrical rollers 3a are installed, and twelve cylindrical rollers 3b are installed on the inner peripheral side holding member 5. As described above, a plurality of ring-shaped holding members are connected in the radial direction to form a retainer, and the cylindrical rollers are installed in each of them, so that a cylindrical roller holding portion is formed for each holding member. It is possible to install a larger number of cylindrical rollers on the outer peripheral side of the holding member.

In the above embodiment, an example is shown in which the holding portion is formed by cutting out from the outer peripheral surface side of the holding members 1 and 5 toward the center in the radial direction. However, the present invention is not limited to this. Instead, the holding portion may be formed by cutting out from the inner peripheral surface side of the holding members 1 and 5 outward in the radial direction.

Embodiment 2 FIG. FIG. 13 is a front view of a thrust bearing according to another embodiment of the present invention, and FIG. 12 is a sectional view taken along line AA in FIG. First, FIG.
2, the configuration of the present embodiment will be outlined based on FIG.

In the drawing, reference numeral 21 denotes a ring-shaped inner ring portion;
Reference numeral 3 denotes a ring-shaped outer ring portion (see FIG. 13), which is similar to that of the first embodiment. Reference numeral 25 denotes a retainer, which includes a first holding member 27 and a second holding member 29. Reference numeral 31 denotes a cylindrical roller, and 18 is
And 12 on the inner peripheral side.

Next, each component will be described based on a component diagram. FIG. 14 is a front view of the cylindrical roller 31, and FIG. 15 is a side view of the cylindrical roller. As shown in FIGS. 14 and 15, the cylindrical roller 31 has a cylindrical main body portion 31a and a main body portion 31a.
a has shaft portions 31b formed at both ends.

FIG. 16 is a plan view of the inner side of the first holding member 27, FIG. 17 is a front view thereof, FIGS. 18, 19, and 20 are cross-sectional views taken along line AA in FIG. It is a B sectional view and an arrow CC sectional view. In FIG. 16, 27
Reference numerals a and 27b denote openings for the cylindrical roller 31 to protrude. The opening 27a on the outer peripheral side is provided with 18, and the opening 27b on the inner peripheral side is provided.

Reference numeral 28 denotes semicircular grooves provided on both sides in the radial direction of the openings 27a and 27b.
The shaft portion 31b of the cylindrical roller 31 is installed at the bottom. 30 is the first
A screw insertion hole into which a screw for connecting the holding member 27 and the second holding member 29 is inserted.

FIG. 21 is a plan view of the outer surface of the first holding member 27. FIG. As shown in FIG. 21, a concave portion 33 for embedding a head of a screw inserted into the screw insertion hole 30 is provided on an outer surface side of the first holding member 27.

When manufacturing the first holding member 27, not only the openings 27a and 27b but also the groove 28 can be processed independently on the outer peripheral side and the inner peripheral side.
The number a can be made larger than that of the opening 27b on the inner peripheral side, and the roller mounting efficiency can be increased.

Embodiment 3 FIG. 22 is an explanatory view of a thrust bearing retainer and a cylindrical roller according to Embodiment 3 of the present invention. In the third embodiment, a holder is formed by stacking two holding members having openings,
In each holding member, a roller holding flange is formed on the outer surface of the opening (the surface opposite to the mating surface of the two holding members).

The configuration will be described below with reference to FIG.
Reference numeral 40 denotes a holding member constituting the retainer, and reference numerals 40a and 40b denote openings provided on the outer peripheral side and the inner peripheral side for accommodating cylindrical rollers, respectively. The outer peripheral side is the inner peripheral side as in the second embodiment. It is formed more than the side. The opening 40a,
40b is processed using a ball end mill or the like, and a flange portion 41 protruding inward from the opening is formed on the outer surface side of the holding member 40 over the entire circumference.

Reference numeral 43 denotes a cylindrical roller, and hemispherical protrusions 43a are formed on both end surfaces as shown in the figure. The openings 40a, 40 of the holding member 40 on one side formed as described above.
The cylindrical roller 43 is accommodated in Ob, the other holding member 40 is overlapped, and these are joined. Accordingly, the cylindrical roller 43 can be rotatably held in a state where a part of the side surface of the cylindrical roller 43 projects to the outer surface side.

According to the third embodiment, the second embodiment
Similarly to the above, the openings 40a and 40b of each holding member can be processed independently on the outer peripheral side and the inner peripheral side, so that the number of the outer peripheral side openings 40a can be larger than the number of the inner peripheral side openings 40b. Thus, the roller mounting efficiency can be increased.

In the above example, the flange portion 41 is connected to the opening 4
Although an example in which the openings 40a and 40b are formed over the entire circumference is shown, the present invention is not limited to this.
0b may be formed only on both sides (radial side). In this case, the projecting portions 4 on the hemisphere
There is no need to provide 3a.

Although the first to third embodiments have been described by taking a cylindrical roller as an example, the present invention is not limited to this. For example, a truncated conical roller having a diameter reduced toward the inner peripheral side is described. It may be.

[0034]

As described above, in the present invention, the number of rollers in each row in the cage is increased from the inner peripheral side to the outer peripheral side, so that the stress value applied to each roller side surface is lower than that of the prior art. Can withstand larger thrust loads.

Further, since the retainer is formed by connecting a plurality of holding members for holding the rollers in each row in the radial direction, the holding portions of the rollers are processed for each holding member in each row. And the number of holding portions in the outer circumferential row can be easily made larger than the number of holding portions in the inner circumferential row. As a result, the mounting efficiency of the rollers is enhanced, and a thrust bearing that is small and can be used even under high pressure can be realized.

Further, the roller holding portion of the holding member is formed by a notch portion cut radially from the peripheral surface side of the holding member, and the opening on the peripheral surface side of the notch portion is closed by the peripheral surface of the adjacently disposed holding member. With this configuration, the peripheral surface of the holding member can function as a roller drop prevention ring for the adjacent holding member, so that the number of components can be reduced and the whole can be made compact.

Further, since the plurality of holding members are screwed and connected to the screw holes formed so as to straddle between the adjacent holding members, the number of working steps can be reduced and the assembling efficiency can be increased.

Further, the roller has shaft portions at both ends, and the retainer is formed by stacking two holding members having holes for accommodating the rollers and grooves on both sides of the hole. Since the shaft of the roller is held by the hole formed by the groove, the accommodation hole and the groove can be formed for each roller, and the accommodation hole and the groove on the outer peripheral side of the retainer can be formed on the inner peripheral side. The roller mounting efficiency can be increased.

Also, the retainer is formed by stacking a housing hole for the roller and two holding members having a flange in the housing hole. Since the rollers are configured to hold the rollers, it is possible to form the accommodation holes for each roller, and it is possible to increase the number of the accommodation holes and the grooves on the outer peripheral side of the retainer than on the inner peripheral side,
Roller mounting efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view of an embodiment of the present invention.

FIG. 2 is a front view of one embodiment of the present invention.

FIG. 3 is a partial perspective view of one embodiment of the present invention.

FIG. 4 is a plan view of an outer peripheral side holding member used in the embodiment of the present invention.

FIG. 5 is a front view of the outer peripheral side holding member used in the embodiment of the present invention.

FIG. 6 is a plan view of an inner peripheral side holding member used in the embodiment of the present invention.

FIG. 7 is a front view of the inner peripheral side holding member used in the embodiment of the present invention.

FIG. 8 is a front view of a cylindrical roller used in the embodiment of the present invention.

FIG. 9 is a side view of the cylindrical roller used in the embodiment of the present invention.

FIG. 10 is a plan view of a roller fall prevention ring used in the embodiment of the present invention.

FIG. 11 is a front view of a roller fall prevention ring used in the embodiment of the present invention.

FIG. 12 is a horizontal sectional view of another embodiment of the present invention.

FIG. 13 is a front view of another embodiment of the present invention.

FIG. 14 is a front view of a cylindrical roller used in another embodiment of the present invention.

FIG. 15 is a side view of a cylindrical roller used in another embodiment of the present invention.

FIG. 16 is a plan view of an inner surface side of a holding member used in another embodiment of the present invention.

FIG. 17 is a front view of a holding member used in another embodiment of the present invention.

FIG. 18 is a sectional view taken along the line AA of FIG. 16;

19 is a sectional view taken along the line BB in FIG. 16;

20 is a sectional view taken along the line CC of FIG. 16;

FIG. 21 is a plan view of an outer surface side of a holding member used in another embodiment of the present invention.

FIG. 22 is an explanatory view of a holding member and a cylindrical roller used in another embodiment of the present invention.

FIG. 23 is an explanatory view of an arrangement of cylindrical rollers of a conventional thrust bearing.

FIG. 24 is an explanatory diagram of a method of processing a retainer of a thrust bearing.

DESCRIPTION OF SYMBOLS 1 Outer side holding member 3a Outer side cylindrical roller 3b Inner side cylindrical roller 5 Inner side holding member 7 Set screw 9 Roller fall prevention ring 25 Cage 27 First holding members 27a, 27b Opening 28 Groove 29 second holding member 31 cylindrical roller 31a body part of cylindrical roller 31b shaft part of cylindrical roller

Claims (6)

[Claims] 1. A thrust bearing in which rollers are arranged in a plurality of rows in a circumferential direction in a retainer, wherein the number of rollers in each row in the retainer is increased from an inner peripheral side to an outer peripheral side. 2. The thrust bearing according to claim 1, wherein the cage is formed by connecting a plurality of holding members for holding the rollers in each row in a radial direction. 3. The holding portion of the roller in the holding member includes a notch portion cut in a radial direction from a peripheral surface side of the holding member, and a circumferential opening of the notch portion is adjacent to the holding member. The thrust bearing according to claim 2, wherein the thrust bearing is closed at a surface. 4. The thrust bearing according to claim 2, wherein said plurality of holding members are screwed and connected to screw holes machined between adjacent holding members. 5. The roller has shaft portions at both ends, and the retainer is formed by stacking two holding members each having an accommodation hole for the roller and grooves on both sides of the accommodation hole. 2. The thrust bearing according to claim 1, wherein the shaft of the roller is held by a hole formed by the groove. 6. The retainer has a configuration in which a housing hole for the roller and two holding members having a flange in the housing hole are overlapped, and the holding member is overlapped to form an enclosure formed by the flange. 2. The thrust bearing according to claim 1, wherein said roller is held.