Roller and cage assembly

Abstract

To provide a roller and cage assembly which is excellent in assembling ability on machinery for preventing increase in the number of components while securing a high load capacity.SOLUTION: A roller and cage assembly includes a plurality of rollers, and a cage 2 for holding the rollers, the cage 2 including a pair of ring members 4 facing to both axial ends of each roller, and a plurality of pillar parts 5 mounted over between the outer diameter parts of the pair of ring members 4 and provided at fixed spaces in the circumferential direction, where the rollers are put. On the inner diameter part of each ring member 4, a roller holding claw 6 is provided for locking the roller to the cage inner diameter side. A cage radial chamfer length B satisfies the following relationship to a cage thickness A: 0<B / A≤1.6.SELECTED DRAWING: Figure 3A

Description

[Technical field]

[0001] The present invention relates to a roller and cage assembly for use in, for example, a double row. [Background technology]

[0002] In order to ensure the load capacity of a roller and cage assembly, it is necessary to increase the roller packing rate. When increasing the roller packing rate, it is common to use a roller and cage assembly that ensures load capacity by removing the columns on the inner diameter side of the cage, but this causes the rollers to separate on the inner diameter side of the cage, making it difficult to assemble into mechanical devices.

[0003] Furthermore, when the roller and cage assembly are operated in double rows, each roller and cage assembly generates a thrust force component (hereinafter referred to as induced thrust force) due to roller skew, requiring the mechanical device to have a mechanism for supporting the thrust force. For rollers and cages used in multiple rows, it is desirable to have a high load capacity, excellent assembly properties into mechanical devices, and a reduced number of parts.

[0004] As shown in Fig. 6, in a conventional cage, roller retaining claws 52 are provided between adjacent rollers 50 on the inner diameter part of annular part 51 to prevent rollers 50 from slipping out towards the inner diameter side of the cage (Patent Document 1). Furthermore, as shown in Fig. 7, the packing rate of rollers 50 is specified to be 80% or more. This ensures both the load capacity of the roller and cage and the ease of assembly of the machine.

[0005] In another conventional example, as shown in Fig. 8, end face 53a of roller 53 is made flat (Patent Document 2). This makes it possible to increase the contact length and ensure a high load capacity. In addition, face 54a of spacer 54 arranged opposite end face 53a of roller 53 is made tapered. This makes it possible to reduce the sliding area between the end of roller 53 and spacer 54, effectively reducing sliding resistance during operation. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2005-106211 A [Patent Document 2] JP 2009-216112 A Summary of the Invention [Problem to be solved by the invention]

[0007] In Patent Document 1, roller retaining claws are provided on the inner diameter side of the cage, and the roller packing rate is set to 80% or more, thereby achieving both a high load capacity for the roller and cage assembly and improved ease of assembly to the device. However, when used in double rows, there is a risk that the roller retaining claws will come into contact with the rollers due to the induced thrust force of adjacent rollers and cages.

[0008] In Patent Document 2, a tapered spacer is disposed opposite the end face of the roller to reduce sliding resistance during operation. However, the need for the spacer leads to an increase in the number of parts.

[0009] An object of the present invention is to provide a roller and cage assembly that ensures a high load capacity, is easy to assemble into a mechanical device, and prevents an increase in the number of parts. [Means for solving the problem]

[0010] The roller and cage assembly of the present invention comprises a plurality of rollers and a cage for holding these rollers, The cage includes a pair of ring members facing both axial ends of each of the rollers, a plurality of pillar portions that are provided across the outer diameter portions of the pair of ring members and are provided at regular intervals in the circumferential direction, into which the rollers are inserted; A roller and cage assembly in which a roller retaining claw is provided on an inner diameter portion of each of the ring members to prevent the roller from slipping out toward the inner diameter side of the cage, A radial thickness of the column portion is defined as a cage wall thickness A, and a length of a radially extending portion of a chamfer connecting an outer diameter surface and a width surface of the cage is defined as a cage radial chamfer length B, A caged roller with a cage wall thickness A and cage radial chamfer length B satisfy the following relationship. 0 The "retainer wall thickness" refers to the radial thickness of the column portion or the axial thickness of the ring member. The term "radial chamfer length of the cage" refers to the length of the radially extending portion of the chamfer connecting the outer diameter surface and the width surface of the cage.

[0011] According to this configuration, the cage radial chamfer length B with respect to the cage wall thickness A is 0

[0012] The cage has a so-called gate-shaped cage shape with a pair of ring members and multiple pillars, which allows for a higher roller filling rate and a higher load capacity than cages with pillars on the inner diameter side. Since roller retaining claws are provided on the inner diameter part of each ring member, the rollers do not separate to the inner diameter side of the cage during assembly, making it easy to assemble into mechanical devices. The roller retaining claws are provided on the inner diameter part of each ring member, which prevents the need for additional parts to prevent rollers from falling off and reduces costs.

[0013] In the case of a double row of rollers and cages, adjacent cages in the axial direction may be in contact with each other. In this case, it is possible to rotate the cage smoothly without adding any spacers or other parts to reduce sliding resistance during operation.

[0014] In a configuration in which the roller and cage assembly rolls between the inner diameter hole of the outer member and the shaft, ​​The radial clearance between the outer diameter of the shaft and the inner diameter of the roller retaining claw is C1. The radial clearance from the outer diameter of the roller retaining claw to the outer diameter position of the roller retaining claw toward the radially outward direction to the position where it intersects with the roller is C2, The radial clearance from the inner diameter of the column portion to the position where the inner diameter of the column portion intersects with the roller in the radial direction inward is C3, When the radial clearance between the inner diameter of the outer member and the outer diameter of the column portion is C4, The relationships C1>C3 and C2>C4 may be satisfied.

[0015] In order to prevent the roller retaining claws of the cage from contacting the rollers or shaft while the roller and cage are in operation, it is possible to secure a cage clearance. With this configuration, by satisfying the relationships C1>C3 and C2>C4, it is possible to realize smooth operation without the roller retaining claws coming into contact with the rollers or shaft.

[0016] The surface roughness of the ring member side surface, which is the width surface of the cage, may be Rmax=12.5s or less. In this case as well, smooth operation can be achieved.

[0017] The roller retaining claw may be a bent piece-shaped roller retaining claw provided between adjacent rollers on the inner diameter portion of the ring member. In this case, by bending the roller retaining claw after the rollers are assembled, the rollers can be made inseparable from the cage, which provides excellent assemblyability to mechanical devices.

[0018] The roller and cage assembly used in double rows may be inserted on an eccentric shaft, in which case the double row roller and cage assembly can be used under high load conditions where eccentric motion occurs. Effect of the Invention

[0019] In the roller and cage assembly of the present invention, the gate-shaped cage is provided with roller retaining pawls that prevent the rollers from slipping out toward the inner diameter side of the cage, and the cage radial chamfer length B with respect to the cage wall thickness A is 0 [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a perspective view of a roller and cage assembly according to a first embodiment of the present invention. [Diagram 2] FIG. 4 is a vertical sectional view of the roller and cage assembly used in double rows. [Figure 3A] FIG. 4 is an enlarged cross-sectional view of the cage of the roller and cage assembly. [Figure 3B] FIG. 13 is a conceptual diagram showing a modified example of the cage. [Figure 4] FIG. 3B is a partially enlarged view of part IV in FIG. 3A. [Diagram 5] FIG. 2 is a cross-sectional view of a main portion of the roller and cage assembly. [Figure 6] FIG. 11 is a vertical sectional view of a roller and cage assembly of a conventional example. [Figure 7] FIG. 2 is a cross-sectional view of the roller and cage assembly. [Figure 8] FIG. 11 is a diagram showing rollers and spacers in another conventional example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] [First embodiment] A roller and cage assembly according to an embodiment of the present invention will be described with reference to Figures 1 to 5. This roller and cage assembly is used in double rows in applications such as industrial machinery, vehicles, etc. However, it is also possible to use the roller and cage assembly in a single row.

[0022] <Overall structure of roller and cage> ​As shown in Figure 1, roller and cage assembly 1 comprises a cage 2 and a number of rollers 3. The cage 2, which holds the number of rollers 3, has a pair of ring members 4 and a number of pillar portions 5. The pair of ring members 4 face both axial ends of each roller 3, in other words, they are a pair of annular members that face each other and are spaced apart in the axial direction.

[0023] The multiple pillars 5 are installed across the outer diameter parts of the pair of ring members 4 and are provided at regular intervals in the circumferential direction, with pockets formed between adjacent pillars 5, 5 in the circumferential direction, into which the rollers 3 fit. The inner diameter part of each ring member 4 is provided with roller retaining claws 6 that prevent the rollers 3 from slipping out toward the inner diameter side of the cage. The rollers 3 are made of, for example, bearing steel or the like, and are, for example, needle rollers. However, the rollers 3 may also be cylindrical rollers. In this specification, "axial direction" refers to a direction along or parallel to the axis AX of the roller and cage assembly 1. "Radial direction" refers to a direction perpendicular to the straight line that forms the "axial direction."

[0024] As shown in FIG. 2, the roller and cage assembly are used by being inserted in double rows on a shaft 7, with the roller and cage assembly 1a, 1b arranged adjacent to each other in the axial direction. The shaft 7 may be an eccentric shaft. Of the roller and cage assembly 1a, 1b used in double rows, the cages adjacent to each other in the axial direction are in contact with each other. During operation, the roller and cage assembly 1a on one side in the axial direction supports the induced thrust force Fa of the roller and cage assembly 1b on the other side in the axial direction at the radial chamfer position 4a1 of the cage 2. The radial chamfer position 4a1 is the position where the width dimension (axial dimension) of the cage 2 is maximum.

[0025] <Cage> The pillar portion 5 is provided with a diameter larger than the pitch circle diameter of the roller array and extends along the axial direction. As shown in Fig. 3A, the roller retaining claw 6 is a bent piece-like roller retaining claw provided in a portion between adjacent rollers in the inner diameter portion of the ring member 4. As shown in Fig. 4, the roller retaining claw 6 is inclined axially inward as it approaches the inner diameter side. The bending angle θ of the roller retaining claw 6 with respect to the ring member 4 is, for example, 30° to 90°.

[0026] <Manufacturing method> As shown in Fig. 3A, the cage is formed into a gate shape by, for example, cutting out a pipe material and pressing or welding it. The cage itself is then subjected to a known heat treatment to achieve a specified hardness. After rollers are assembled into the heat-treated cage, the inner diameter portion of the ring member 4 is bent axially inward. The bending is performed by pressing or spinning. As a result, roller retaining claws 6 are provided on the inner diameter portion of the ring member 4.

[0027] <Cage wall thickness and radial chamfer on outer diameter side of cage> To ensure the load capacity of the roller and cage assembly, it is necessary to increase the roller packing rate around the entire circumference of the cage. To increase the roller packing rate, the columns on the inner diameter side are naturally removed, resulting in a gate-shaped cage. The roller packing rate P is the value shown in the following formula. P = (d × n) / (D × π) where d is the roller diameter, n is the number of rollers, and D is the pitch circle diameter of the roller arrangement. In the case of a gate-shaped retainer, as shown in FIG. 3B, when supporting the induced thrust force Fa, the ring member 4 of the retainer is deformed inward, making it easier for the rollers 3 (FIG. 2) and the roller retaining claws 6 (FIG. 2) to come into contact with each other, which hinders smooth rotation.

[0028] 3A, the cage 2 supports the induced thrust force Fa at the radial chamfer position 4a1. If the cage thickness is A and the cage radial chamfer length is B, when the cage radial chamfer length B is longer than the cage thickness A, the bending moment applied to the ring member 4 of the cage 2 becomes larger, and the inward deformation of the ring member 4 becomes larger.

[0029] <Test confirmation> As examples, several test pieces with different cage wall thicknesses A and cage radial chamfer lengths B were used to test and confirm whether the rollers and cages rotate smoothly when a load equivalent to the induced thrust force Fa is applied. As comparative examples, the results were also confirmed with a roller and cage with a cage of approximately the same shape as the examples, without roller retaining claws. In Table 1, the examples are shown as "with claws" and the comparative examples as "without claws." The cage wall thickness A is measured at the center position of the column portion 5 in the axial direction.

[0030] [Table 1] ◯: Smooth rotation, △: Friction, ×: Wear

[0031] It was confirmed that the roller and cage assembly of the embodiment rotates smoothly when the cage wall thickness A is 1.6 or less with respect to the cage radial chamfer length B. Even when using a single row of rollers with cages, the induced thrust force generated by the rollers skewing is supported by the load application point of the cage, so the same results as those of the above test can be said. In the comparative example without roller retaining claws, the cage rotates smoothly without contacting the rollers regardless of B / A, but the rollers separate to the inner diameter side of the cage, making it difficult to assemble into mechanical equipment.

[0032] <Retainer clearance> As shown in Figure 5, securing a cage clearance is one way to prevent the roller retaining claws 6 of the cage from contacting the rollers 3 or shaft 7 during operation. Specifically, for a configuration in which the rollers with cage roll in contact between the bore 8a of the outer member 8 and the shaft 7, the following relationship must be satisfied.

[0033] C1>C3 and C2>C4 however, C1: Radial clearance between the outer diameter of the shaft 7 and the inner diameter 6b of the roller retaining jaws 6 C2: The radial clearance from the outer diameter 6a of the roller retaining claw 6 to the position where the outer diameter position of the roller retaining claw 6 intersects with the roller 3 radially outward C3: Radial clearance from the inner diameter 5b of the column portion 5 to the position where the inner diameter of the column portion 5 intersects with the roller 3 in the radial direction C4: Radial clearance between the inner diameter 8a of the outer member 8 and the outer diameter 5a of the column portion 5 By satisfying the relationships C1>C3 and C2>C4, the roller retaining pawl 6 does not come into contact with the roller 3 or the shaft 7, and smooth operation can be achieved. ​

[0034] As shown in Fig. 4, the surface roughness of the ring member side surface 4a, which is the width surface of the cage, may be Rmax = 12.5s or less. Even when the maximum height Rmax of the surface roughness of the ring member side surface 4a is 12.5s or less in this way, it is possible to realize smooth operation.

[0035] <Action and effect> According to the roller and cage assembly 1 of FIG. 1 described above, as shown in FIG. 3A, the cage radial chamfer length B with respect to the cage wall thickness A is 0.

[0036] The cage 2 has a so-called gate-shaped cage shape with a pair of ring members 4 and multiple pillars 5, which allows for a higher roller packing rate and ensures a higher load capacity than cages with pillars on the inner diameter side. Since roller retaining claws 6 are provided on the inner diameter part of each ring member 4, the rollers do not separate to the inner diameter side of the cage during assembly, making it easy to assemble into machinery. The roller retaining claws 6 are provided on the inner diameter part of each ring member 4, which prevents the need for additional parts to prevent rollers from falling off and reduces costs.

[0037] As shown in Figure 2, roller retaining claw 6 is a bent piece-shaped roller retaining claw provided between adjacent rollers on the inner diameter part of ring member 4. Therefore, by bending the roller retaining claw after the rollers are assembled, rollers 3 can be made inseparable from cage 2, resulting in excellent assembly ability into mechanical devices. When the rollers and cages 1a, 1b used in a double row are inserted on an eccentric shaft, the double row rollers and cages 1a, 1b can be used under conditions where eccentric motion occurs under high load conditions.

[0038] ​Although the embodiment for carrying out the present invention has been described above, the embodiment disclosed herein is illustrative in all respects and is not restrictive. The scope of the present invention is indicated by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0039] Reference Signs List 1, 1a, 1b... roller and cage, 2... cage, 3... roller, 4... ring member, 5... column portion, 6... roller retaining claw, 7... shaft, 8... outer member

Claims

1. A roller bearing includes a plurality of rollers and a cage for holding the rollers, The cage includes a pair of ring members facing both axial ends of each of the rollers, a plurality of pillars disposed across the outer diameter portions of the pair of ring members and spaced at regular intervals in the circumferential direction; A roller and cage assembly in which a roller retaining claw is provided on an inner diameter portion of each of the ring members to prevent the roller from slipping out toward the inner diameter side of the cage, A radial thickness of the column portion is defined as a cage wall thickness A, and a length of a radially extending portion of a chamfer connecting an outer diameter surface and a width surface of the cage is defined as a cage radial chamfer length B, A roller and cage in which the cage radial chamfer length B with respect to the cage wall thickness A satisfies the following relationship. 0<B / A≦1.6

2. 2. The roller and cage assembly according to claim 1, wherein the roller and cage assembly are used in a double row, and the cages adjacent to each other in the axial direction are in contact with each other.

3. In the roller and cage assembly according to claim 1 or 2, the roller and cage assembly is configured to roll between the bore of the outer member and the shaft, The radial clearance between the outer diameter of the shaft and the inner diameter of the roller retaining claw is C1. The radial clearance between the outer diameter of the roller retaining claw and the outer diameter position of the roller retaining claw toward the radially outward direction and the position where the roller intersects with the roller is C2, The inner diameter of the column portion and the radial clearance from the inner diameter position of the column portion to the position where it intersects with the roller in the radial direction inward are defined as C3, When the radial clearance between the inner diameter of the outer member and the outer diameter of the column portion is C4, A roller and cage assembly that satisfies the relationships C1>C3 and C2>C4.

4. 3. The roller and cage assembly according to claim 1, wherein the surface roughness of the ring member side surface, which is the cage width surface, is Rmax = 12.5s or less.

5. 3. The roller and cage assembly according to claim 1, wherein said roller retaining claw is a bent piece-shaped roller retaining claw provided on an inner diameter portion of said ring member in a portion between adjacent rollers.

6. 3. The roller and cage assembly according to claim 2, wherein the roller and cage assembly used in a double row is inserted onto an eccentric shaft.

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