JP3795156B2 - Resin rolling bearing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin rolling bearing having a resin ring.
[0002]
[Prior art]
The resin rolling bearing generally refers to a bearing ring such as an inner / outer ring formed of a synthetic resin and a rolling element formed of a metal, a synthetic resin, ceramics, glass or the like, for example, Japanese Patent Laid-Open No. 8-135662. It is shown in the gazette.
[0003]
[Problems to be solved by the invention]
By the way, the resin rolling bearing as described above is useful as a lightweight bearing mainly used for a rotating part of a light load, but the following problems are caused by the physical properties of the resin that is a material of the race ring. Is pointed out.
[0004]
(1) Since the elastic modulus of the resin bearing ring is small, the rigidity is lower than that of a metal rolling bearing, and the elastic deformation is large when an external force is applied. Since the elastically deformed portion does not have the escape location, the bearing performance is impaired such that the raceway surface is prone to be adversely affected and the rolling smoothness of each rolling element is lowered.
[0005]
{Circle around (2)} When the race is manufactured by molding, the dimensional accuracy is likely to be lowered due to molding shrinkage, so that fitting failure during mounting is likely to occur.
[0006]
(3) Since the thermal conductivity is small, there is a possibility that the raceway surface is deformed, for example, it is easy to store heat.
[0007]
In the above publication example, although measures are taken to mitigate the curved deformation of the raceway surface due to the axial load applied when the race ring is clamped and fixed from both sides in the axial direction, One of the load and radial load rarely works on the bearing, and in many cases the axial load and radial load work in combination, so it is an insufficient measure when considering various bearing use situations There is room for improvement. In addition, in the above publication example, no countermeasures for the above problems (2) and (3) are found.
[0008]
Accordingly, an object of the present invention is to suppress deformation of the raceway surface with respect to a load in a resin rolling bearing. In addition to the above object, the present invention has an object to make it possible to absorb a dimensional error at the fitting portion and to further improve heat dissipation.
[0009]
[Means for Solving the Problems]
A resin rolling bearing according to claim 1 of the present invention is a resin rolling bearing having a resin raceway as an outer ring and an inner ring, and includes end faces in the axial direction of the outer ring and the inner ring, and the outer ring and the the outer peripheral surface and the inner peripheral surface of the inner ring of the outer ring to be mating surface in each of the inner ring, at least one of the allowable portion is provided bending the relief portion is elastically deformed while permitting elastic deformation The bendable portion is discontinuous in the circumferential direction and the axial direction, and the shape thereof is a plurality of concave portions surrounded by meat portions by being formed to be recessed from the surface. Features.
A resin rolling bearing according to a second aspect of the present invention is a resin rolling bearing having a resin raceway as an outer ring and an inner ring, and includes an end surface in the axial direction of the outer ring, an outer peripheral surface of the outer ring, and the Both the end surface in the axial direction of the inner ring and the inner peripheral surface of the inner ring are provided with a bending allowance portion that continuously allows elastic deformation and escapes the elastically deforming portion, and the bending allowance portion is A plurality of streak-like recesses that are independent from each other in the circumferential direction.
[0011]
In the configuration of the present invention described above, when an axial load and a radial load are applied, the axial end portion and the fitting portion of the bearing ring are easily elastically deformed locally due to the presence of the bending allowance portion, and the stress due to the load is increased. In addition to being dispersed, the fitting stress on the mating surface is alleviated. Moreover, when elastically deforming in this way, the elastically deformed portion is absorbed by the bending allowance portion, so that it is difficult for the deformation to be transmitted to the raceway surface that guides the rolling elements.
[0012]
In addition, the use of a bending allowance as a recess or protrusion increases the surface area of the outer ring or inner ring in the axial direction, the outer ring of the outer ring, and the mating surface of the inner ring of the inner ring , thereby facilitating heat dissipation. Is done.
[0013]
Further, when the concave portion or the projection is formed in a streak shape, the elastic deformation is further facilitated and heat is easily dissipated.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Details of the present invention will be described with reference to various embodiments shown in FIGS. In any of the embodiments, a radial ball bearing is taken as an example.
[0015]
1 and 2 relate to Embodiment 1 of the present invention. FIG. 1 is a perspective view in which a part of a resin rolling bearing is cut out, and FIG. 2 is a vertical sectional view of an upper half.
[0016]
The resin-made rolling bearing 1 shown in the figure has inner and outer rings 2 and 3 made of synthetic resin, and a large number of rolling elements 4 made of metal. Both ends of the inner and outer rings 2 and 3 are exposed to the outside in the axial direction. The portion is provided with bending allowance portions 5 and 6 that allow elastic deformation and escape the elastically deformed portion.
[0017]
Examples of the synthetic resin used as the material for the inner and outer rings 2 and 3 include polyphenylene sulfide (PPS), polyamide (PA6, PA66), polyimide (PI), polyamideimide (PAI), polyetheretherketone (PEEK), and the like. . Examples of the material of the rolling element 4 include bearing steel, the above synthetic resin, ceramics, and glass.
[0018]
The bending allowance portions 5 and 6 described above are partially arcuate recesses that are recessed from the axial direction at circumferential positions at both axial ends of the inner ring 2 and the outer ring 3. Further, the depth of the recess is set so as not to reach the region where the rolling element 4 exists in the inner / outer rings 2, 3, and the rigidity of the raceway surface of the inner / outer rings 2, 3 is significantly reduced. Is to prevent.
[0019]
Such a resin rolling bearing 1 facilitates elastic deformation at both axial ends of the inner and outer rings 2 and 3, and increases the surface area at both axial ends of the inner and outer rings 2 and 3 to increase heat. Will be promoted.
[0020]
For this reason, if this resin rolling bearing 1 is used for rotating and supporting the rotating shaft with respect to the case, for example, although not shown, when the moment load due to a slight inclination of the rotating shaft is received, Both end portions in the axial direction of the outer rings 2 and 3 are elastically deformed by the presence of the bending allowance portions 5 and 6 formed of concave portions, and the stress due to the load is dispersed. In addition, since the elastically deformed portion is absorbed by the bending allowance portions 5 and 6 formed of concave portions, the deformation is not transmitted to the raceway surfaces of the inner and outer rings 2 and 3. Therefore, the rolling characteristics of the rolling element 4 on the raceway surface are stabilized, and the desired bearing performance can be exhibited.
[0021]
In addition, even when an axial load is received or when an axial load and a radial load are combined, the same operations and effects as described above are exhibited.
3 and 4 relate to a second embodiment of the present invention, FIG. 3 is a perspective view in which a part of a resin rolling bearing is cut out, and FIG. 4 is a vertical sectional view of the upper half.
[0022]
In this embodiment, bending allowance portions 5 and 6 are provided at both axial end portions and inner peripheral portion of the inner ring 2 and both axial end portions and outer peripheral portion of the outer ring 3.
[0023]
The bending allowance portions 5 and 6 in this embodiment are streaky irregularities. That is, the bending allowance portion 5 of the inner ring 2 is axially formed in a large number of radial grooves 5a formed along the radial direction at both axial end portions of the inner ring 2 and the inner peripheral portion (fitting portion) of the inner ring 2. It consists of a large number of axial grooves 5b formed along, and each of these radial grooves 5a and axial grooves 5b is continuous. The bending allowance portion 6 of the outer ring 3 is formed along the axial direction at a large number of radial grooves 6a formed along the radial direction at both axial ends of the outer ring 3 and at the outer peripheral portion (fitting portion) of the outer ring 3. The radial grooves 6b and the axial grooves 6b are connected one by one.
[0024]
In such a resin rolling bearing 1, in addition to the operation and effect of the first embodiment, the inner ring 2 and the outer ring 3 can be easily elastically deformed at the inner periphery and the outer ring 3, and the inner and outer rings 2, 3 can be easily deformed. This further increases the surface area of the substrate and promotes heat dissipation.
[0025]
In particular, in the second embodiment, even when a radial load is mainly received, the deformation is not transmitted to the raceway surfaces of the inner / outer rings 2 and 3, and the axial load and the radial load act in a combined manner. It is excellent in practicality in the usage situation of bearings, such as being able to respond effectively to such cases. In addition, even if an excessive fitting stress occurs due to a dimensional error or the like in a fitting portion of the inner / outer rings 2 and 3 with respect to a case (not shown) or the like, it can be absorbed and relaxed, and a fitting failure can be avoided. It becomes like this. In addition, since the elastically deformed portions at the fitting portions of the inner / outer rings 2 and 3 are absorbed by the bending allowance portions 5 and 6 formed of recesses, the deformation is not transmitted to the raceway surfaces of the inner and outer rings 2 and 3.
[0026]
5 and FIG. 6 relate to Embodiment 3 of the present invention, FIG. 5 is a perspective view in which a part of a resin rolling bearing is cut out, and FIG. 6 is a vertical sectional view of the upper half.
[0027]
In this embodiment, bending allowance portions 5 and 6 are provided at both axial end portions and inner peripheral portion of the inner ring 2 and both axial end portions and outer peripheral portion of the outer ring 3.
[0028]
The bending allowance portions 5 and 6 in this embodiment are a plurality of recesses that are independent of each other in a matrix, and the shape of the recesses is also a dimple.
[0029]
Such a resin rolling bearing 1 exhibits substantially the same functions and effects as those of the second embodiment. However, in this case, when the axially opposite ends and the fitting portions of the inner and outer rings 2 and 3 are elastically deformed due to the presence of the bending allowance portions 5 and 6, the direction of the elastic deformation is lost. Thus, it can be elastically deformed in the most effective form, and stress distribution is performed well.
[0030]
By the way, the bending allowance portions 5 and 6 of the first to third embodiments can be obtained by transferring from the molding die when the inner and outer rings 2 and 3 are manufactured by molding. 3 can be obtained by appropriate machining or surface treatment. In particular, when the inner / outer rings 2 and 3 are manufactured by molding, molding shrinkage occurs on the outer peripheral surface and inner peripheral surface of the inner / outer rings 2 and 3 and the dimensional accuracy is likely to decrease. In this case, since the dimensional error at the fitting portion can be absorbed, the fitting stress can be effectively dispersed and relaxed.
[0031]
In addition, this invention is not limited only to the said Embodiment 1-3, A various application and deformation | transformation can be considered.
[0033]
(1) As the cross-sectional shapes of the concave portions and the grooves as the bending allowance portions 5 and 6 in each of the above embodiments, any shape such as a square shape, a triangular shape, a trapezoidal shape, and a hemispherical shape can be selected.
[0034]
(2) In the said Embodiment 2, 3, the said bending | flexion allowance parts 5 and 6 can be partially formed in the several area | region of the circumferential direction.
[0035]
(3) In the second embodiment, the radial grooves 5a and 6a on both end faces and the axial grooves 5b and 6b on the peripheral face may be made independent without being continuous, and the diameters on both end faces The direction grooves 5a and 6a and the axial grooves 5b and 6b on the circumferential surface may be made independent by shifting the phase in the circumferential direction. Further, these grooves may be formed not in the axial direction but in the circumferential direction.
[0036]
【The invention's effect】
In the resin rolling bearing according to the present invention , the bending allowance portions are provided on the side surfaces in the axial direction of the outer ring and the inner ring , which are resin bearing rings , and on the outer circumferential surface of the outer ring and the inner circumferential surface of the inner ring. Since the deformation is facilitated, the stress distribution when an axial load, radial load or moment load is applied can be achieved, and the deformation of the raceway surface of the raceway can be effectively suppressed. Therefore, the rolling characteristics of the rolling elements that roll on the raceway surface of the raceway can be stabilized, and the desired bearing performance can be exhibited.
[0037]
In addition, when a bendable portion is provided in the fitting portion of the race ring, for example, even when molding shrinkage occurs and the dimensional accuracy is reduced when the race ring is manufactured by molding, a dimensional error in the fit portion. Can be absorbed, so that it is possible to disperse and relieve the fitting stress, thereby avoiding poor fitting.
[0038]
Further, by the concave portion of the allowable unit deflection, since it becomes possible to increase the surface area of the bearing ring, etc. can be enhanced heat dissipation effect can be excellent resin rolling bearing with less heat resistance temperature.
[Brief description of the drawings]
FIG. 1 is a perspective view in which a part of a resin rolling bearing according to Embodiment 1 of the present invention is cut away. FIG. 2 is a longitudinal sectional view of an upper half of the resin rolling bearing of FIG. FIG. 4 is a perspective view in which a part of the resin rolling bearing of form 2 is cut away. FIG. 4 is a longitudinal sectional view of the upper half of the resin rolling bearing of FIG. 3. FIG. 5 is a perspective view of the resin rolling bearing of embodiment 3 of the present invention. Perspective view with part cut away [FIG. 6] Vertical sectional view of the upper half of the resin rolling bearing of FIG.
DESCRIPTION OF SYMBOLS 1 Resin rolling bearing 2 Inner ring 3 Outer ring 5, 6 Deflection allowable part

Claims (2)

A resin rolling bearing having a resin raceway as an outer ring and an inner ring, wherein the outer ring and the inner ring have end faces in the axial direction, and outer circumferences of the outer ring that are mating surfaces in the outer ring and the inner ring, respectively. At least one of the surface and the inner peripheral surface of the inner ring is provided with a bending allowance portion that allows elastic deformation and escapes the elastically deformed portion, and the bending allowance portion includes a circumferential direction and an axial direction. A resin-made rolling bearing characterized in that it is a plurality of recesses that are discontinuous and are formed so as to be recessed from the surface, and are surrounded by meat parts. A resin rolling bearing having resin-made bearing rings as an outer ring and an inner ring, the end surface in the axial direction of the outer ring and the outer peripheral surface of the outer ring, and the end surface in the axial direction of the inner ring and the inner peripheral surface of the inner ring Both are provided with a bending allowance portion that allows elastic deformation and serves as a relief of the elastic deformation portion, and the bending allowance portions are a plurality of streak-like recesses that are independent from each other in the circumferential direction. A resin-made rolling bearing.

Images