WO2023003231A1

WO2023003231A1 - High-capacity variable load rolling bearing

Info

Publication number: WO2023003231A1
Application number: PCT/KR2022/009817
Authority: WO
Inventors: 이영근
Original assignee: 이영근
Priority date: 2021-07-22
Filing date: 2022-07-07
Publication date: 2023-01-26
Also published as: KR20230015058A; KR102598973B1

Abstract

The present invention relates to a high-capacity variable load rolling bearing in which the rated capacity of the bearing varies according to the external force in a variable load environment, and which can thus prevent an unnecessarily large bearing from being used, wherein high rigidity is maintained in the radial direction even when the contact angle is large, and due to the high rigidity, the high-capacity variable load rolling bearing operates effectively in environments in which the radial load is large and under combined load conditions in which the radial load dominates and an axial load also acts on the bearing.

Description

High-capacity load variable rolling bearings

The present invention relates to a rolling bearing, and more particularly, to a high-capacity, load-variable rolling bearing capable of achieving low torque, having a large rated radial capacity, and having a variable rated capacity of the bearing depending on an external force.

Ball bearings refer to bearings that use balls as rolling elements between inner and outer races to drive the bearing. In general ball bearings, a retainer (aka cage) is installed to maintain a circumferential distance between balls, which are rolling elements.

1 is a perspective view of a partially cut away ball bearing 1 of the prior art. Referring to FIG. 1, a conventional ball bearing 1 includes a ring-shaped outer ring 10 with an outer ring raceway 11 formed on the inner diameter side and a ring-shaped inner ring 20 with an inner ring raceway 21 formed on the outer diameter side. And, a plurality of balls 30 positioned between the outer ring 10 and the inner ring 20 and rolled between the outer ring raceway 11 and the inner raceway 21, and the circumferential spacing of the balls 30 It consists of a retainer 40 installed between the outer ring 10 and the inner ring 20 to hold.

Rated capacity (static load rating, dynamic load rating), which is the bearing capacity of rolling bearings such as ball bearings against external loads, is determined by the number of rolling elements, the size of rolling elements (ball diameter, roller diameter in the case of roller bearings). ) and so on.

In the ball bearing shown in FIG. 1, the ball as a rolling element is spherical, and the rolling element (ball) has an outer ring track compared to a roller bearing such as a tapered roller bearing known in Korean Patent Publication No. 10-2009-0041103. Since the contact area in contact with (11) and the inner ring raceway 21 is small, there is an advantage in that the contact resistance is low and the rotational torque is low, but the bearing capacity for the load acting on the bearing is smaller than that of a roller bearing.

Therefore, tapered roller bearings known from Korean Publication No. 10-2009-0041103, Publication No. 10-2009-0041103, have been used in conventional automobile transmissions. Ball bearings are used. When the load applied to the bearing is variable, such as in a transmission, there is a problem in that a bearing of an unnecessarily large size is installed compared to operation because the bearing must be designed for a large load.

For example, a transmission has a characteristic in that the load acting on the bearing is large in the low gear (for example, 1st to 3rd gear) and the load acting on the bearing is very small in the high gear (5th gear or more). It is less than 10%, and operates more than 90% mainly at high stages. Bearings installed in transmissions have an operation rate of less than 10%, but they have to be designed for the low stage with a large load, so bearings with a large rated capacity are used unnecessarily at the high stage operating at 90% or more. In addition, the weight and rotational torque of the bearing were also a big problem for use at high stages.

The present invention has been proposed to solve the problems of the prior art as described above, and is a high-capacity load variable type that can prevent the use of unnecessarily large-sized bearings because the rated capacity of a bearing is changed according to external force in a variable load environment. It is an object to provide a rolling bearing.

For the above object, the present invention provides a ring-shaped outer ring with an outer ring raceway formed concavely on the inner diameter surface, a ring-shaped inner ring with an inner ring raceway formed concavely on the outer diameter surface, a plurality of first rolling elements, and a plurality of first rolling elements. It consists of two rolling elements and includes a rolling element aligned along the circumferential direction between the outer ring raceway and the inner raceway;

The outer ring raceway includes an outer ring raceway surface contact portion formed in an arc shape with a concave cross section and a cylindrical outer ring raceway variable contact portion positioned adjacent to the outer ring raceway surface contact portion in an axial direction; The inner ring raceway includes an inner ring raceway surface contact portion formed in an arc shape with a concave cross section and a cylindrical inner ring raceway variable contact portion positioned adjacent to the inner ring raceway surface contact portion in an axial direction;

The first rolling element includes a cylindrical rolling element variable contact part and a rolling element spherical surface part provided on both sides of the rolling element variable contact part in an axial direction and formed as a convex spherical surface;

The rolling element spherical part is located between the outer ring raceway surface contact part and the inner raceway surface contact part, and the rolling element variable contact part is located between the outer ring raceway variable contact part and the inner ring raceway variable contact part;

The second rolling element provides a high-capacity load variable rolling bearing, characterized in that the cylindrical second rolling element contact portion is located between the outer ring raceway variable contact portion and the inner ring raceway variable contact portion.

In the above, the second rolling element is characterized in that the center of the second rolling element is formed in a protruding shape with an increased diameter, and the second rolling element contact part is formed in a convex arc shape.

In the above, the outer ring raceway surface contact portion is provided on both sides of the axial direction with the outer ring raceway variable contact portion therebetween, and the inner ring raceway surface contact portion is provided on both sides of the axial direction with the inner ring raceway variable contact portion therebetween;

The outer ring raceway surface contact portion and the inner raceway surface contact portion are characterized in that they face each other in a diagonal direction.

In the above, the rolling element spherical portion of the first rolling element is characterized in that it contacts the outer ring raceway surface contact portion from the outside in the diagonal direction and contacts the inner ring raceway surface contact portion from the inside.

In the above, it is characterized in that the rolling element variable contact part of the first rolling element is spaced apart from the outer ring raceway variable contact part and the inner ring raceway variable contact part in a state where no external force is applied.

In the above, the amount of interference between the rolling body spherical portion, the outer ring raceway surface contact portion, and the inner ring raceway surface contact portion is larger than the amount of interference between the rolling element variable contact portion, the outer ring raceway variable contact portion, and the inner ring raceway variable contact portion.

In the above, the second rolling element contact portion of the second rolling element is characterized in that it contacts the outer ring raceway variable contact portion from the outside and contacts the inner ring raceway variable contact portion from the inside.

In the above, it is characterized in that the outer ring raceway variable contact portion and the inner ring raceway variable contact portion are formed in a crowning shape with a central portion protruding in a radial direction.

According to the high-capacity load variable rolling bearing according to the present invention, the rated capacity of the bearing is varied according to external force in a variable load environment, so it is possible to prevent the use of unnecessarily large-sized bearings, and even when the contact angle is large, the large contact angle in the radial direction can be prevented. Rigidity is maintained, and the radial stiffness is large, so it can operate effectively in environments with large radial loads and combined load conditions in which radial loads dominate and axial loads also act.

1 is a partially cut away perspective view showing a ball bearing in the prior art,

2 is an exploded perspective view showing a high-capacity load variable rolling bearing according to the present invention;

Figure 3 is a partially cut perspective view showing a partially cut away ball bearing of the present invention 1 is a prior art,

3 is a partially cut-away perspective view of a high-capacity load variable rolling bearing according to the present invention,

4 is a cross-sectional view taken along A-A of FIG. 3;

5 is a perspective view showing a cage of a high-capacity load variable rolling bearing according to the present invention;

6 is a cross-sectional view showing a modified example of a high-capacity load variable rolling bearing;

7 is a perspective view showing a modified example of a first rolling element of a high-capacity load variable rolling bearing according to the present invention;

8 is a flowchart illustrating a process of assembling a high-capacity load variable rolling bearing according to the present invention.

All technical terms and scientific terms used in the description of the present invention have meanings commonly understood by those of ordinary skill in the art to which this disclosure belongs, unless otherwise defined. All terms used in this disclosure are selected for the purpose of more clearly describing the disclosure and are not selected to limit the scope of rights according to the disclosure.

Expressions such as "comprising", "including", "having", etc. used in the description of the present invention imply the possibility of including other embodiments, unless otherwise stated in the phrase or sentence in which the expression is included. It should be understood in open-ended terms.

Singular expressions used in the description of the present invention may include plural meanings unless otherwise stated, and this applies to singular expressions described in the claims as well.

Expressions such as "first" and "second" used in the description of the present invention are used to distinguish a plurality of components from each other, and do not limit the order or importance of the components.

In the description of the present invention, when an element is referred to as being “connected” or “coupled” to another element, that element is capable of being directly connected to or coupled to the other element, or a new or different element. It should be understood that it can be connected or combined via a component.

Hereinafter, with reference to the accompanying drawings, the high-capacity load variable rolling bearing of the present invention will be described in detail.

2 is an exploded perspective view showing a high-capacity load variable type rolling bearing according to the present invention, FIG. 3 is a partially cut away perspective view showing a high-capacity load variable type rolling bearing according to the present invention, and FIG. 5 is a perspective view showing a cage of a high capacity load variable rolling bearing according to the present invention, FIG. 6 is a cross-sectional view showing a modified example of a high capacity load variable rolling bearing, and FIG. 7 is a high capacity load variable rolling bearing according to the present invention It is a perspective view showing a modified example of the first rolling element of the bearing, and FIG. 8 is a flowchart illustrating a process of assembling a high-capacity load variable rolling bearing according to the present invention.

For convenience of explanation, in the following description, the horizontal direction of FIG. 4 will be described as an axial direction and the vertical direction will be described as a radial direction.

As shown in FIG. 2 , the high-capacity load variable rolling bearing 100 according to the present invention includes an outer ring 110, an inner ring 120, a rolling element 130, and a cage 140. Seals may be further provided between the outer ring 110 and the inner ring 120 on both sides of the rolling element 130 in the axial direction of the rolling bearing 100, and the illustration of the seal is omitted. In the high-capacity load variable rolling bearing 100 according to the present invention, the rolling element parts 130 may be arranged in a single row or in a double row.

The outer ring 110 is provided in a ring shape. A concave outer ring raceway is formed on the inner diameter surface of the outer ring 110. The outer ring raceway includes an outer ring raceway variable contact portion 111 and an outer ring raceway surface contact portion 113.

The outer ring raceway variable contact portion 111 is formed in a cylindrical shape. The outer ring raceway variable contact portion 111 is located at the center of the outer ring 110 in the axial direction.

The outer ring raceway surface contact portion 113 is formed in a circular arc shape with a concave cross section. The outer ring raceway surface contact portion 113 is located adjacent to the outer ring raceway variable contact portion 111 in the axial direction. The outer ring raceway contact surface contact portion 113 is provided on both sides in the axial direction with the outer ring raceway variable contact portion 111 interposed therebetween. The outer ring raceway variable contact portion 111 may be formed in a crowning shape with a center protruding in a radial direction.

The inner ring 120 is formed in a ring shape. The inner ring 120 is concentric with the outer ring 110 and is located inside the outer ring 110 in the radial direction. A concave inner ring raceway is formed on the outer diameter surface of the inner ring 120. The inner ring raceway includes an inner ring raceway variable contact portion 121 and an inner ring raceway surface contact portion 123.

The inner ring raceway variable contact portion 121 is formed in a cylindrical shape. The inner ring raceway variable contact portion 121 is located at the center of the inner ring 120 in the axial direction. The inner ring raceway variable contact portion 121 is formed to face the outer ring raceway variable contact portion 121 .

The inner ring raceway surface contact portion 123 is formed in a circular arc shape with a concave cross section. The inner ring raceway surface contact portion 123 is located adjacent to the inner ring raceway variable contact portion 121 in the axial direction. The inner ring raceway surface contact portion 123 is provided on both sides in the axial direction with the inner ring raceway variable contact portion 121 interposed therebetween. The inner raceway surface contact portion 123 is formed to face the outer ring raceway surface contact portion 113 in a diagonal direction. The inner ring raceway variable contact portion 121 may be formed in a crowning shape with a central portion protruding in a radial direction.

The rolling element 130 includes a plurality of first rolling elements 131 and a plurality of second rolling elements 133 . The plurality of first rolling elements 131 and second rolling elements 133 are arranged along the circumferential direction between the outer ring raceway and the inner raceway.

The first rolling element 131 includes a cylindrical rolling element variable contact part 1311 and a rolling element spherical part 1313 provided on both sides of the rolling element variable contact part 1311 in the axial direction and formed in a convex spherical shape. In the first rolling element 131, a spherical ball is ground to form a rolling element variable contact part 1311, and the spherical surface of the ball remains on both sides of the rolling element variable contact part 1311 to become a rolling element spherical surface part 1313. can

The rolling element variable contact part 1311 is located between the outer ring raceway variable contact part 111 and the inner ring raceway variable contact part 121.

The rolling body spherical portion 1313 is located between the outer ring raceway surface contact portion 113 and the inner raceway surface contact portion 123. The rolling body spherical portion 1313 contacts the outer raceway surface contact portion 113 from the outside in the diagonal direction and contacts the inner raceway surface contact portion 123 from the inside.

7 shows a modified example of the first rolling element 131. In the first rolling element 131, the end of the rolling element spherical part 1313 may be ground to form a flat rolling element end face 1315 at the end, and the rolling element groove part 1317 concave in the rolling element end face 1315 can be formed. A concave rolling element groove 1317 is formed in the rolling element end surface 1315 so that lubricating oil can be stored, which has an advantageous effect on lubrication.

In a state where no external force is applied to the first rolling element 131 located between the outer ring 110 and the inner ring 120, the rolling element change contact part 1311 of the first rolling element 131 is the outer ring raceway variable contact part. (111) and the inner ring raceway variable contact portion (121). In a state where no external force is applied to the first rolling element 131 located between the outer ring 110 and the inner ring 120, the rolling element change contact part 1311 of the first rolling element 131 is the outer ring raceway variable contact part. (111) and the inner ring raceway variable contact portion 121 may be provided in light contact. At this time, the amount of interference between the rolling element spherical surface portion 1313, the outer ring raceway surface contact portion 113, and the inner ring raceway surface contact portion 123 is It is greater than the amount of interference between the variable contact portion 1311 and the outer ring raceway variable contact portion 111 and the inner ring raceway variable contact portion 121.

The second rolling element 133 is formed in a cylindrical shape. The second rolling element 133 is plural and is spaced apart along the circumferential direction. The number of the second rolling elements 133 is preferably smaller than or equal to the number of the first rolling elements 131, but may be larger.

The second rolling element 133 is provided with a cylindrical second rolling element contact part 1331, and the second rolling element contact part 1331 is between the outer ring raceway variable contact part 111 and the inner ring raceway variable contact part 121. located in The second rolling element 133 may be formed in a protruding shape with an increased center diameter, and the second rolling element contact part 1331 may be formed in a convex arc shape.

The second rolling element contact portion 1331 is provided in contact with the outer ring raceway variable contact portion 111 on the outside in the radial direction and in contact with the inner ring raceway variable contact portion 121 on the inside in the radial direction. Therefore, the amount of interference between the second rolling element contact portion 1331 of the second rolling element 133 and the outer ring raceway variable contact portion 111 and the inner ring raceway variable contact portion 121 is (111) and the inner ring raceway variable contact portion 121 greater than the amount of interference between them.

When a gap is formed between the second rolling element contact part 1331 of the second rolling element 133, the outer ring raceway variable contact part 111, and the inner ring raceway variable contact part 121, the second rolling element 133 The gap formed between the second rolling element contact portion 1331, the outer ring raceway variable contact portion 111, and the inner ring raceway variable contact portion 121 is formed between the rolling element change contact portion 1311 of the first rolling element 131 and the inner and outer outer rings. Between the variable raceway contact portion 111 and the inner ring raceway variable contact portion 121, a gap smaller than the formed gap is formed.

When only the first rolling element 131 is provided, if the contact angle (a) of the first rolling element 131 is increased, the rolling element variable contact part 1311 becomes the outer ring raceway variable contact part 111 even with a small radial load. ) and the inner ring raceway variable contact portion 121, the load variable effect does not occur significantly.

In the present invention, since the second rolling element 133 contacts and supports the outer ring raceway variable contact portion 111 and the inner ring raceway variable contact portion 121, stiffness in the radial direction is increased.

Therefore, the second rolling element contact portion 1331 of the second rolling element 133 is provided in contact with the outer ring raceway variable contact portion 111 on the outside in the radial direction and in contact with the inner ring raceway variable contact portion 121 on the inside in the radial direction. In this case, even when the contact angle (a) of the first rolling element 131 is increased, the effect of varying the load is exhibited reliably.

The cage 140 is provided in a cylindrical shape. The cage 140 is located between the outer ring 110 and the inner ring 120, and serves to maintain a distance between the first rolling element 131 and the second rolling element 133 of the rolling element 130. . The cage 140 is composed of two cage members 140-1, each inserted from both sides in the axial direction, and the ends are coupled and provided.

As shown in FIG. 5, the cage member 140-1 has a first pocket groove 141 and a second pocket groove 143 concave along the circumferential direction and an end portion 145 protruding in the axial direction. are provided The two cage members 140-1 have ends 145 facing each other.

A protrusion protruding in the axial direction is formed at the end 145 of one cage member 140-1 and a concave groove is formed at the end 145 of the other cage member 140-1, so that the one cage member 140-1 ) is inserted into the groove of the cage member 140-1 on the other side, and the cage member 140-1 on both sides can be coupled. In addition, by forming a hole passing through the end portion 145 in the axial direction, the cage members 140-1 on both sides may be coupled with rivets and screws.

The first pocket grooves 141 on both sides face each other and are formed as first pockets into which the first rolling element 131 is inserted. The second pocket grooves 143 on both sides face each other and are formed as second pockets into which the second rolling element 133 is inserted.

The shape of the first pocket groove 141 is formed as a spherical surface with a concave bottom and side surface according to the shape of the first rolling element 131, and the shape of the second pocket groove 143 is a shape of the second rolling element 133 Depending on the shape of the bottom is flat, the side is formed with a curved surface.

Hereinafter, a method of assembling the rolling bearing 100 according to the present invention will be described with reference to FIG. 8 .

First, the plurality of first rolling elements 131 are inserted into a part where the inner ring 120 and the outer ring 110 are eccentrically spaced apart. The first rolling element 131 is inserted, and the inner ring 120 and the outer ring 110 are rotated concentrically, and a plurality of first rolling elements 131 are formed between the inner ring 120 and the outer ring 110 along the circumferential direction. make it sorted.

Then, the second rolling element 133 is laid down with a wide gap between the first rolling elements 131 and inserted between the inner ring 120 and the outer ring 110, and then the inner ring 120 and the outer ring 110 ) Rotate the second rolling element 133 by 90° between. The second rolling elements 133 are positioned and inserted between the first rolling elements 131 at equal intervals. The second rolling element 133 is formed in a cylindrical shape with a width contacting the outer ring raceway variable contact portion 111, so even when the inner ring 120 and the outer ring 110 are concentric, the second rolling element 133 is laid down to 120) and the outer ring 110.

The first rolling element 131 and the second rolling element 133 are aligned between the inner ring 120 and the outer ring 110, and the cage member 140-1 is assembled on both sides in the axial direction. A protrusion protruding in the axial direction is formed at the end 145 of one cage member 140-1 of both cage members 140-1, and a concave groove is formed at the end 145 of the other cage member 140-1. By forming, the protrusion is inserted into the groove, the cage members 140-1 on both sides are coupled, and the rolling bearing 100 is assembled.

The high-capacity load variable rolling bearing of the present invention can prevent the use of unnecessarily large-sized bearings because the rated capacity of the bearing is varied according to external force in a variable load environment, so that the load applied to the bearing is variable, such as in an automobile transmission. It can be used in case of high fuel economy.

Claims

A ring-shaped outer ring 110 with an outer ring raceway formed concavely on the inner diameter surface, a ring-shaped inner ring 120 with an inner ring raceway formed concavely on the outer diameter surface, a plurality of first rolling elements 131 and a plurality of second It consists of a rolling element 133 and includes a rolling element 130 aligned along the circumferential direction between the outer ring raceway and the inner raceway;

The outer ring raceway includes an outer ring raceway surface contact portion 113 formed in an arc shape with a concave cross section, and a cylindrical outer ring raceway variable contact portion 111 located adjacent to the outer ring raceway surface contact portion 113 in the axial direction; The inner ring raceway includes an inner ring raceway surface contact portion 123 formed in an arc shape with a concave cross section, and a cylindrical inner ring raceway variable contact portion 121 located adjacent to the inner ring raceway surface contact portion 123 in the axial direction;

The first rolling element 131 includes a cylindrical rolling element contact part 1311 and a rolling element spherical part 1313 provided on both sides of the rolling element contact part 1311 in an axial direction and formed in a convex spherical shape;

The rolling body spherical surface portion 1313 is located between the outer ring raceway contact surface contact portion 113 and the inner ring raceway surface contact portion 123, and the rolling element variable contact portion 1311 is the outer ring raceway variable contact portion 111 and the inner ring raceway variable contact portion 121 located between;

The second rolling element 133 is a high capacity load variable rolling bearing, characterized in that the cylindrical second rolling element contact part 1331 is located between the outer ring raceway variable contact part 111 and the inner ring raceway variable contact part 121 in a cylindrical shape. (100).
The high-capacity load variable rolling bearing (100) according to claim 1, wherein the second rolling element (133) is formed in a protruding shape with an increased center diameter, and the second rolling element contact portion (1331) is formed in a convex arc shape. .
The method of claim 1 or 2, wherein the outer ring raceway surface contact portion 113 is provided on both sides of the axial direction with the outer ring raceway variable contact portion 111 interposed therebetween, and the inner ring raceway surface contact portion 123 is the inner ring raceway variable contact portion. 121 is provided on both sides in the axial direction with the intervening;

The high-capacity load variable rolling bearing 100, characterized in that the outer ring raceway surface contact portion 113 and the inner ring raceway surface contact portion 123 face each other in a diagonal direction.
The method of claim 3, wherein the rolling element spherical portion 1313 of the first rolling element 131 contacts the outer raceway surface contact portion 113 from the outside in the diagonal direction and contacts the inner raceway surface contact portion 123 from the inside. High-capacity load variable rolling bearing (100), characterized in that.
The method of claim 4, characterized in that the rolling element variable contact part (1311) of the first rolling element (131) is spaced apart from the outer ring raceway variable contact part (111) and the inner ring raceway variable contact part (121) in a state where no external force is applied. A high-capacity load variable rolling bearing (100).
The method of claim 4, wherein the amount of interference between the rolling body spherical portion (1313), the outer ring raceway contact surface contact portion (113), and the inner ring raceway surface contact portion (123) is the amount of interference between the rolling element variable contact portion (1311), the outer ring raceway variable contact portion (111), and the inner ring raceway surface contact portion (111). A high-capacity load variable rolling bearing (100), characterized in that the amount of interference between the raceway variable contact parts (121) is greater.
The method of any one of claims 1 to 6, wherein the second rolling element contact part 1331 of the second rolling element 133 contacts the outer ring raceway variable contact part 111 from the outside and the inner ring raceway variable contact part from the inside ( Load variable rolling bearing 100, characterized in that in contact with 121).
The method of claim 7, wherein the second rolling element contact part 1331 of the second rolling element 133 before the first rolling element variable contact part 1311 comes into contact with the outer ring raceway variable contact part 111 and the inner ring raceway variable contact part ( Load variable rolling bearing 100, characterized in that first contact with 121).
The load variable rolling bearing (100) according to claim 8, wherein the outer ring raceway variable contact portion (111) and the inner ring raceway variable contact portion (121) are formed in a crowning shape with a central portion protruding in a radial direction.