JP2004084705A - Cylindrical roller bearing with synthetic resin retainer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the handling during assembly and disassembly, and to improve the reliability of a cylindrical roller bearing 3a which is operated at a high speed under high and oscillating loads. <P>SOLUTION: A retainer 9a is formed of a synthetic resin. The distance in the radial direction of an inside diameter side half part out of inner surfaces of pockets 10 and 10 of the retainer 9a is gradually reduced inwardly in the radial direction. Cylindrical rollers 4 and 4 and the retainer 9a are attachably/detachably fitted to an outer ring 1 while the cylindrical rollers 4 and 4 are retained by the retainer 9a. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
A cylindrical roller bearing with a retainer made of a synthetic resin according to the present invention is used for rotatably supporting a rotating shaft such as an axle of a railway vehicle on a fixed portion such as a housing. In particular, the present invention is a high-speed rotation, high load, vibration load, even when used under conditions where impact load is applied, impact resistance, abrasion resistance, high-speed resistance, heat resistance, seizure resistance can be sufficiently secured, Moreover, the present invention aims to realize a cylindrical roller bearing with a cage made of a synthetic resin, which can be easily handled during assembly, inspection, and maintenance.
[0002]
[Prior art]
As a rolling bearing for rotatably supporting a rotating shaft such as an axle of a railway vehicle as described above with respect to a fixed portion such as a housing, a cylindrical roller bearing is used to support a large radial load. Then, the axial displacement of the plurality of cylindrical rollers constituting the cylindrical roller bearing is suppressed, and the components of the cylindrical roller bearing, that is, the structure capable of preventing the outer ring, the inner ring, and the plurality of cylindrical rollers from shifting in the axial direction. , A flanged cylindrical roller bearing is used.
[0003]
FIGS. 15 and 16 show, as an example of such a flanged cylindrical roller bearing, flange portions 6a, 6b, which are provided at both axial ends of an outer race 1 and at one axial end (a left end in FIG. 15) of an inner race 2, respectively. 8 shows a flanged (NJ-type) flanged cylindrical roller bearing 3 provided with 8. The flanged cylindrical roller bearing 3 includes the outer ring 1, the inner ring 2, and a plurality of cylindrical rollers 4. The outer race 1 has a cylindrical outer raceway 5 at an intermediate portion of the inner peripheral surface, and the pair of inward flanges corresponding to the first and second flanges described in the claims. 6a and 6b are provided respectively. The inner race 2 has a cylindrical inner raceway 7 at an intermediate portion of the outer peripheral surface, and the outward flange 8 corresponding to the third flange described in the claims at one end. .
[0004]
Further, the plurality of cylindrical rollers 4, 4 are rotatably held by an annular retainer 9 made of a soft metal having self-lubricating property such as brass, and the outer ring raceway is provided. 5 and the inner raceway 7. In this state, the rolling surfaces of the cylindrical rollers 4 and 4 come into rolling contact with the outer raceway 5 and the inner raceway 7. On the other hand, the portions of the cylindrical rollers 4, 4 close to the outer diameter at both axial end surfaces thereof are in close proximity to the inner surfaces of the inward flanges 6 a, 6 b and the inner surface of the outward flange 8. Or make sliding contact. Further, in this state, the outer peripheral surfaces of both ends of the retainer 9 are brought into close proximity to the inner peripheral surfaces of the inward flanges 6a and 6b provided at both ends of the outer race 1, whereby the retainer 9 The outer ring guide is used to regulate the diametric position by the outer ring 1.
[0005]
The above-described flanged cylindrical roller bearing 3 can not only support a large radial load, but also provide both axial end faces of the cylindrical rollers 4, 4 and one of the inward flange portions 6a, 6b (FIG. The axial load can be supported by the engagement with the inward flange portion 6b (to the right of 15) and the outward flange portion 8 described above. That is, when a right axial load is applied to the inner ring 2 in FIG. 15, the inner diameter of the outward flange 8 and the other axial end surfaces (the left end surfaces in FIG. 15) of the cylindrical rollers 4, 4 are closer to the outer diameter. At the same time, the inner surface of the one inward flange portion 6b and the one end surface in the axial direction (right end surface in FIG. 15) of each of the cylindrical rollers 4, 4 are in sliding contact with each other, so that the axial direction is reduced. Support the load. Accordingly, the components of the flanged cylindrical roller bearing 3, that is, the outer ring 1, the inner ring 2, and the cylindrical rollers 4, 4 are not separated regardless of the axial load applied during use or before assembly.
[0006]
[Problems to be solved by the invention]
In the case of the conventional flanged cylindrical roller bearing 3 that supports the axle or the like of a railway vehicle as described above, a vibration load or an impact load is constantly applied from a line or the like during use. For this reason, the cage 9 for rotatably holding the cylindrical rollers 4, 4 is excellent in vibration resistance, shock resistance, high-speed resistance (to withstand high-speed rotation), low heat generation, and abrasion resistance. In addition, a cage 9 or an extruded cage made of brass or a press-type cage (not shown) made of mild steel is used. However, from the actual use conditions and the results of endurance tests, in the case of such a metal cage 9 made of brass or mild steel, there is a possibility that the desired impact resistance and wear resistance cannot be sufficiently secured. I realized something.
[0007]
That is, in the case of the above-mentioned metal cage 9, since the amount of elastically deformable deformation is small and its own weight is heavy, the durability against vibration load and impact load cannot be sufficiently ensured, and damage such as cracking occurs early. Can occur. Further, in order to maintain the positioning of the cage 9 in good condition, both ends in the axial direction of the outer peripheral surface of the cage 9 as the guided surfaces, and inward flanges provided at both axial ends of the outer ring 1 as the guide surfaces. It is necessary to reduce the gap between the inner peripheral surfaces of 6a and 6b.
[0008]
For this reason, the gap between the guided surface and the guide surface, the rolling contact portion between each cylindrical roller 4, 4 and the outer ring raceway 5 and the inner ring raceway 7, and the side surface of each cylindrical roller 4, 4 and the above Lubricants such as grease may not be easily taken into the sliding contact portions between the inward and outward flange portions 6a, 6b, 8 with the inner side surfaces, and wear and heat generation may be likely to increase. Further, in the case of the metal cage 9, the material cost and the processing cost are increased, and the manufacturing cost may be increased based on this.
The cylindrical roller bearing with a cage made of a synthetic resin of the present invention was invented in view of such circumstances.
[0009]
[Means for Solving the Problems]
The cylindrical roller bearing with a synthetic resin cage of the present invention has an outer ring, an inner ring, a plurality of cylindrical rollers, a cage, a first and a second, similarly to the above-described conventionally known cylindrical roller bearing. , A third flange.
The outer race has a cylindrical outer raceway on its inner peripheral surface.
The inner race has a cylindrical inner raceway on its outer peripheral surface.
Further, each of the cylindrical rollers is rotatably provided between the inner raceway and the outer raceway.
Further, the retainer is of an annular shape and holds each of the cylindrical rollers in a freely rolling manner.
Further, the first and second flanges are formed at both ends in the axial direction of the circumferential surface of one of the outer races and the inner race in a state of projecting radially toward the other race. It is provided on the circumference.
Further, the third flange portion is provided on at least one end in the axial direction of the peripheral surface of the other bearing ring so as to protrude radially toward the one bearing ring on the entire circumference.
Then, one of the inner peripheral surface and the outer peripheral surface of the retainer is brought into close proximity to the peripheral surfaces of the first and second flange portions, thereby forming one of the peripheral surfaces of the retainer. Is a guided surface for positioning the retainer in the radial direction.
[0010]
In particular, in the cylindrical roller bearing with a synthetic resin cage of the present invention, the retainer is made of synthetic resin.
Further, pockets are provided at a plurality of circumferentially equidistant locations of the retainer so as to freely roll the cylindrical rollers so as to penetrate the inner and outer peripheral surfaces.
The distance in the circumferential direction of at least a part of the opening edge of the opening edge of each of the pockets opposite to the guided surface in the radial direction of the cage is determined by the roller diameter (diameter) of each of the cylindrical rollers. ), The cylindrical rollers can be held in the pockets so that they cannot pass through the opening edges.
Further, in a state where each of these cylindrical rollers is held in the above-mentioned cage, each of these cylindrical rollers is opposed to the above-mentioned guided surface in each of the above-mentioned pockets in order to attach and detach these cylindrical rollers and the cage to the above-mentioned one race. The pitch circle radius of each of these cylindrical rollers in a state where they are located at the respective opening edges of the side, and the pitch circle of each of these cylindrical rollers in a state where each of these cylindrical rollers is also in contact with the track of the one orbital ring. The difference between the radius and the radius of the raceway surface of the one orbital ring and the radius of the peripheral surface of the first and second flanges is equal to or greater than the flange height of the one orbital ring.
[0011]
More preferably, on one of the inner peripheral surface and the outer peripheral surface of the retainer, which is the guided surface, at least one of the portions (post portions) between the pockets. ), And a concave groove having an arc-shaped cross section in a state of being recessed from the peripheral surface and the guided surface of the interposed portion in a portion of the guided surface which is axially aligned with the intervening portion. Provided in the axial direction.
[0012]
[Action]
According to the cylindrical roller bearing with a retainer made of synthetic resin of the present invention configured as described above, the durability of the retainer is sufficiently ensured even when used under conditions where a vibration load or an impact load is always applied during use. it can. In other words, since this cage is made of synthetic resin, the amount of elastically deformable deformation is large, and the weight is small due to its small weight, the inertial mass is reduced, and the durability against vibration load and impact load is sufficient. Can be secured. Therefore, the cage can be prevented from being damaged at an early stage, and the material cost can be reduced. Further, in a state where each cylindrical roller is held in each pocket of the retainer, the retainer and each cylindrical roller can be attached to and detached from one of the bearing rings provided with the first and second flanges, so that the manufacturing operation can be performed. And easy handling during maintenance and inspection work (maintenance work). Further, when a concave groove is provided in a predetermined portion of the retainer, a lubricant such as grease can be easily taken into a rolling contact portion or a sliding contact portion, and as a result, lubrication of each of these contact portions can be sufficiently ensured. Wear and temperature rise can be reduced.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 7 show a first example of an embodiment of the present invention. The flanged cylindrical roller bearing 3a of the present example includes an outer ring 1, an inner ring 2, a plurality of cylindrical rollers 4, 4, and a retainer 9a. The outer race 1 includes a cylindrical outer raceway 5 at an intermediate portion of the inner peripheral surface, and a pair of inward flanges 6a corresponding to the first and second flanges described in the claims. , 6b are provided respectively. The inner race 2 has a cylindrical inner raceway 7 at an intermediate portion of an outer peripheral surface, and an outward flange 8 corresponding to a third flange described in the claims at one end (the left end in FIG. 1). Are provided respectively.
[0014]
Further, the plurality of cylindrical rollers 4, 4 are rotatably provided between the outer raceway 5 and the inner raceway 7 while being held by a cage 9a described below. The cage 9a is a so-called cage-shaped cage made of a synthetic resin in an annular shape. The cage 10a has a plurality of pockets 10 radially penetrating the inner and outer peripheral surfaces at a plurality of circumferentially equally spaced locations. , 10 are provided. The cylindrical rollers 4 are held in these pockets 10 so as to freely roll. Also, by making both ends in the axial direction of the outer peripheral surface of the retainer 9a close to and facing the inner peripheral surfaces of the inward flanges 6a and 6b, the outer peripheral surfaces of both ends of the retainer 9a are fixed to the retainer 9a. It is a guided surface for positioning in the diameter direction.
[0015]
In addition, with respect to the circumferential direction of a part (the middle part in the axial direction) of the opening edge on the opposite side (inner diameter side) to the guided surface in the radial direction of the retainer 9a among the opening edges of the pockets 10 and 10. The distance d (see FIGS. 3 and 4) is smaller than the outer diameter D (see FIGS. 2 and 3) of each of the cylindrical rollers 4 and 4 (d <D). That is, in the case of this example, the distance d in the circumferential direction of the inner half of the inner surface of each of the pockets 10 and 10 is gradually reduced toward the radially inward side. In other words, the inner diameter half of the inner surface of each of the pockets 10 and 10 is inclined (and curved) so as to become narrower toward the inner diameter. With such a configuration, the cylindrical rollers 4, 4 can be inserted into the pockets 10, 10 only from the radial outside of the retainer 9a, and cannot pass through the opening edges on the inner diameter side. It can be held freely. In the case of this example, the distance d of the intermediate portion between the inner surfaces of the pockets 10 and 10 is gradually reduced toward the inner diameter side. May be smaller than the outer diameter (diameter) D of each of the cylindrical rollers 4, 4. In short, it is only necessary that the cylindrical rollers 4, 4 cannot pass through these opening edges.
[0016]
In the case of the present example, as shown in FIGS. 6 and 7, in a state where the cylindrical rollers 4, 4 are held in the retainer 9a, the cylindrical rollers 4, 4 and the retainer 9a are connected to the outer ring. 1 is detachable (attached, detached). For this purpose, the pitch circle radius R _i of the cylindrical roller 4 and 4 in a state in which the 4,4 each cylindrical roller is positioned in the opening edge of the inner diameter side in the pockets 10, 10, also each of the respective cylindrical rollers 4 and 4 with the difference S ₍₌ R o _-R i = the state of the pitch circle radius R _o of the cylindrical rollers 4, 4 being in contact with the outer ring raceway 5 The difference between the radii of the inscribed circles of the cylindrical rollers 4, 4: see FIG. 3) is the difference between the radius of the outer raceway 5 and the radius of the inner peripheral surface of each of the inward flanges 6 a, 6 b. The flange heights of the flange portions 6a and 6b are H (see FIGS. 1 and 7) or more (S ≧ H).
[0017]
Further, in the case of this example, on the outer peripheral surface of the retainer 9a, between the pockets 10, 10 between the respective pockets (columns) and the guided surfaces at both ends in the axial direction of the outer peripheral surface. Concave grooves 11 and 11 are provided in a portion axially aligned with the portion. Each of the concave grooves 11 has an arc-shaped cross section with a radius of curvature r (see FIG. 3), and is recessed from the outer peripheral surface and the guided surface of each of the intervening portions in the axial direction of the retainer 9a. It is provided over. The depth F (see FIG. 1) of each of the concave grooves 11, 11 is set to be larger than the difference between the guided surface and the outer peripheral surface of the intermediate portion in the case where there is a difference in the radial direction. Accordingly, the bottom surface of each of the grooves 11, 11 is located radially inward of the guided surface. At the same time, the width w of each of the grooves 11 in the circumferential direction is made smaller (w <W) than the width W of each of the intervening portions in the circumferential direction (see FIG. 5).
[0018]
According to the cylindrical roller bearing 3a with the synthetic resin cage and the flange configured as described above, even if the vibration load or the impact load is always used from the line or the like during use, the holding is possible. The durability of the container 9a can be sufficiently ensured. That is, since the retainer 9a is made of synthetic resin, the amount of elastically deformable deformation is increased, and the weight is reduced due to its small weight, the inertial mass is reduced, and the durability against vibration load and impact load is improved. We can secure enough. For this reason, the cage 9a can be prevented from being damaged at an early stage, and the material cost can be reduced. Further, in a state where the cylindrical rollers 4 and 4 are held in the pockets 10 and 10 of the cage 9a, the cage 9a and the cylindrical rollers 4 and 4 are connected to the outer ring provided with the inward flange portions 6a and 6b. Since it can be attached to and detached from the device 1, handling during manufacturing work, maintenance, and inspection work (maintenance work) can be facilitated. Further, when the grooves 11 are provided in predetermined portions of the retainer 9a, a lubricant such as grease can be easily taken into the rolling contact portion or the sliding contact portion, and the lubrication of each contact portion can be sufficiently performed. As a result, wear and temperature rise can be reduced.
[0019]
Next, FIGS. 8 to 14 show a second example of the embodiment of the present invention. In the case of the cylindrical roller bearing 3b with a synthetic resin cage and a flange of the present example, a pair of outwards corresponding to the first and second flanges described in the claims are provided on the outer peripheral surfaces of both ends of the inner ring 2a. In addition to forming the flanges 8a and 8b, an inward flange 6 corresponding to the third flange described in the claims is formed on the inner peripheral surface of one end (the left end in FIG. 8) of the outer race 1a. I have. By making both ends in the axial direction of the inner peripheral surface of the retainer 9b close to and facing the outer peripheral surfaces of the outward flanges 8a and 8b, the inner peripheral surfaces of both ends of the retainer 9b are brought into contact with the retainer 9b. 9b serves as a guided surface for positioning in the diameter direction.
[0020]
The cage 9b is a so-called cage-shaped cage made of a synthetic resin in an annular shape. The cage 10b has a plurality of pockets 10 that are radially penetrated through the inner and outer circumferential surfaces at a plurality of circumferentially equal intervals. , 10 are provided. Further, the outer half of the inner surface of each of the pockets 10 and 10 is inclined (and curved) so that the width of each of the pockets 10 and 10 in the circumferential direction becomes narrower toward the outer diameter side. The cylindrical rollers 4, 4 can be inserted into the pockets 10, 10 only from the radially inner side of the retainer 9b, and can be held in such a manner as to impede the respective opening edges on the outer diameter side.
[0021]
In the case of this example, as shown in FIGS. 13 and 14, the cylindrical rollers 4, 4 and the retainer 9b are attached to the inner ring while the cylindrical rollers 4, 4 are held in the retainer 9b. 2a is detachable (attached and detached). For this purpose, the pitch circle radius R _o of the cylindrical rollers 4, 4 in a state of being positioned in the opening edge of the outer diameter side of each cylindrical roller in the 4,4 the pockets 10, 10, also each of the difference S ₍₌ R o _-R i = each state of these pitch circle radius R _i of each cylindrical roller 4, 4 in these conditions the respective cylindrical rollers 4, 4 is brought into contact with the inner ring raceway 7 The difference between the radii of the circumscribed circles of the cylindrical rollers 14, 14: refer to FIG. 10), and the difference between the radius of the inner raceway 7 and the radius of the inner peripheral surface of each of the outward flanges 8 a, 8 b. The flange heights 8a and 8b are larger than the flange height H (see FIGS. 8 and 14).
[0022]
Further, in the case of this example, on the inner peripheral surface of the retainer 9b, among the inter-portions (posts) between the pockets 10, 10 and the guided surfaces at both ends in the axial direction of the inner peripheral surface. The recessed grooves 11 and 11 are provided in a portion which is aligned in the axial direction with the portion therebetween. Each of the concave grooves 11 has an arc-shaped cross section with a radius of curvature r (see FIG. 10), and is recessed from the inner peripheral surface and the guided surface of each of the intervening portions, in the axial direction of the retainer 9a. Are provided. The depth F (see FIG. 8) of each of the concave grooves 11, 11 is made larger than the difference when the guided surface and the inner peripheral surface of the intermediate portion have a difference in the radial direction. . At the same time, the width w of each of the grooves 11 in the circumferential direction is made smaller (w <W) than the width W of each of the intervening portions in the circumferential direction (see FIG. 11). Other configurations and operations are the same as those of the above-described first example.
[0023]
【The invention's effect】
Since the present invention is configured and operates as described above, a cylindrical roller bearing with a synthetic resin cage that is operated at high speed while receiving a high load and a vibration load while facilitating handling during assembly and disassembly. Reliability can be improved.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a first example of an embodiment of the present invention.
FIG. 2 is a cutaway view of the upper half, viewed from the right in FIG.
FIG. 3 is a view similar to FIG. 2, showing the retainer taken out.
FIG. 4 is a sectional view taken along a line II in FIG. 3;
FIG. 5 is a view from the right side of FIG. 3; FIG. 6 is a view similar to FIG. 2, showing a state in which a retainer and each cylindrical roller are attached to and detached from an inner race.
FIG. 7 is a sectional view taken along a roller in FIG. 6;
FIG. 8 is a sectional view showing a second example of the embodiment of the present invention.
FIG. 9 is a view of the right half of FIG. 8, with the lower half cut away.
FIG. 10 is a view similar to FIG. 9, with the retainer taken out and shown.
FIG. 11 is a sectional view taken along the line c-c in FIG. 10;
FIG. 12 is a view from the right side of FIG. 10; FIG. 13 is a diagram showing a state in which a retainer and each cylindrical roller are attached to and detached from an outer race by cutting an upper half portion;
FIG. 14 is a cross-sectional view taken along a line II-II in FIG. 13;
FIG. 15 is a sectional view showing an example of a conventional cylindrical roller bearing.
FIG. 16 is a cutaway view of the upper half, viewed from the right in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1a Outer ring 2, 2a Inner ring 3, 3a, 3b Cylindrical roller bearing 4 Cylindrical roller 5 Outer ring raceway 6, 6a, 6b Inward flange portion 7 Inner ring raceway 8, 8a, 8b Outward flange portion 9, 9a, 9b Cage 10 Pocket 11 Groove

Claims (2)

An outer ring having a cylindrical outer raceway on its inner peripheral surface; an inner race having a cylindrical inner raceway on its outer peripheral surface; and a plurality of cylindrical rollers rotatably provided between the inner raceway and the outer raceway. An annular retainer that rotatably retains each of these cylindrical rollers; and an axially opposite end of a peripheral surface of one of the outer races and the inner race, and a diameter directed toward the other race. The first and second flanges provided on the entire circumference in a state protruding in the direction, and at least one end in the axial direction of the peripheral surface of the other race, radially project toward the one race. A third flange portion provided on the entire circumference in a state, wherein any one of the inner peripheral surface and the outer peripheral surface of the retainer is the peripheral surface of the first and second flange portions. By making the one peripheral surface of this cage a guided surface for positioning the cage in the radial direction. Time at the bearing,
The retainer is made of a synthetic resin,
In a state where the inner and outer peripheral surfaces are penetrated at a plurality of positions at equal intervals in the circumferential direction of the retainer, pockets are provided for rollingly retaining the cylindrical rollers,
A distance in a circumferential direction of at least a part of an opening edge portion of the opening edge of each of the pockets opposite to the guided surface in a radial direction of the retainer is smaller than an outer diameter of the cylindrical roller. As a result, each of these cylindrical rollers can be held in the above-mentioned pockets so that they cannot pass through these opening edges,
In a state where these cylindrical rollers are held in the cage, in order to attach and detach these cylindrical rollers and the cage to and from the one orbit ring, these cylindrical rollers are placed in the pockets on the opposite side to the guided surface in the pockets. The pitch circle radius of each of these cylindrical rollers in a state positioned at each opening edge, and the pitch circle radius of each of these cylindrical rollers in a state in which each of these cylindrical rollers abuts on the track of the one orbital ring. The difference between the radius of the raceway surface of the one orbital ring and the radius of the circumferential surface of the first and second flanges, which is characterized by being equal to or greater than the flange height of the one orbital ring. Roller bearing with cage made of synthetic resin. On one of the inner peripheral surfaces and the outer peripheral surface of the cage, which is the guided surface, at least one of the portions between the pockets, and between the pockets. 2. A groove which has an arcuate cross section in a state where it is recessed from a peripheral surface and a guided surface of the intervening portion in a portion axially aligned with the portion. 2. A cylindrical roller bearing with a cage made of a synthetic resin described in 1.

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