JP6034325B2 - bearing - Google Patents

Description

  The present invention relates to a bearing that has two rows of rolling elements and prevents the shaft from collapsing.

  There are single row bearings and double row bearings. The rotation shaft support by the bearing is for smooth rotation of the rotation shaft. To support the rotation shaft having a certain width against the radial load, in order to suppress the shaft collapse of the rotation shaft, 2 Often single row bearings are used. Further, a double row bearing having two rows of rolling elements may be used (for example, see Patent Document 1).

JP 2013-96473 A

  However, if two single row bearings are used for a rotating shaft with a certain width to prevent the shaft from collapsing, a width space for arranging two single row bearings in parallel is required. It is difficult to save space.

Also, double row bearing, since a rolling element of the two rows, two columns rolling element and abutment for the two rolling grooves of are formed on the outer ring and the inner ring, two rolling grooves each In addition, it is necessary to match the diameters of the rolling elements and it is very difficult to assemble.

  FIG. 4 is an explanatory view of a conventional double row bearing assembly procedure, and FIG. 4 (a) is a sectional view of an outer ring and an inner ring in a state where the first row rolling elements and the second row rolling elements are not mounted. 4B is a cross-sectional view in which the first row of rolling elements are mounted, and FIG. 4C is a cross-sectional view in which the first row of rolling elements and the second row of rolling elements are mounted.

First, the outer ring and inner ring of the double row bearing will be described. As shown in FIG. 4A, the inner surface of the outer ring 11 is formed with a first rolling groove 12a that comes into contact with the first row of rolling elements and a second rolling groove 13a that comes into contact with the second row of rolling elements. Has been. In addition, a first rolling groove 12b is formed on the outer surface of the inner ring 14 so as to face the first rolling groove 12a of the outer ring 11 and contact the first row of rolling elements, and the second rolling groove 13a of the outer ring 11 is formed. A second rolling groove 13b is formed so as to face the second row of rolling elements. The outer ring 11 is fixed to a member to which a bearing is attached, and the inner ring 14 is fixed to a rotating shaft.

In such a double-row bearing, first rolling groove 12a, matching the diameter of the rolling element in each first rolling groove 12b are required, also first rolling groove 12a of the opposing outer ring 11 and inner ring 14 first rolling groove 12b of the rotation axis direction of the positional accuracy between the second rolling grooves 13b of the second rolling groove 13a and the inner ring 14 of the outer ring 11 is also required, the manufacturing accuracy of outer ring 11 and inner ring 14 are Required. Furthermore, double row bearings are very difficult to assemble.

An example of the work of mounting the first row of rolling elements 15a and the second row of rolling elements 15b from the state in which the first row of rolling elements 15a and the second row of rolling elements 15b shown in FIG. Will be explained. FIG. 5 is an explanatory diagram of an example of an assembling operation for bringing the first row of rolling elements 15a into contact with the first rolling grooves 12a and 12b. The inner ring 14 is arranged eccentrically in the outer ring 11, a first row of rolling elements 15a is inserted between the outer ring 11 and the inner ring 14, and a narrow space between the outer ring 11 and the inner ring 14 as indicated by an arrow. The rolling elements 15a are pushed into the first rolling grooves 12a and 12b in order. Thereby, as shown in FIG.4 (b), the rolling element 15a of the 1st row is mounted | worn with 1st rolling groove 12a, 12b.

However, when assembling the second row of rolling elements 15b in contact with the second rolling grooves 13a and 13b, as shown in FIG. 4B, the first row of rolling elements 15a is already in the first rolling element. Since they are in contact with the running grooves 12 a and 12 b, the inner ring 14 cannot be eccentrically arranged in the outer ring 11. Therefore, after bringing the first row of rolling elements 15a into contact with the first rolling grooves 12a and 12b, the assembly work shown in FIG. 5 is adopted, and the second row of rolling elements 15b is made to move to the second rolling grooves 13a. , 13b cannot be easily brought into contact.

If the assembly work shown in FIG. 5 is adopted and the first row of rolling elements 15a and the second row of rolling elements 15b are brought into contact with each other, the inner ring 14 is arranged eccentrically in the outer ring 11, and the outer ring The first row of rolling elements 15a and the second row of rolling elements 15b are simultaneously inserted between 11 and the inner ring 14. Then, the first rolling elements 15a and the second rolling elements 15b are identified while being sequentially brought into contact with the first rolling grooves 12a and 12b and the second rolling grooves 13a and 13b, as shown in FIG. ), The first row of rolling elements and the second row of rolling elements must be mounted, making assembly extremely difficult and costly.

  An object of the present invention is to provide a bearing that is relatively easy to assemble, that can suppress the tilting of the rotating shaft and can be downsized.

The bearing of the present invention is formed in a cylindrical shape, and the inner surface has a flat portion having a constant axial diameter, and the flat portion is formed with an arcuate first rolling groove that contacts the first row of rolling elements. The second row of rolling elements are the outer ring that comes into contact with the flat portion, the cylindrical outer surface having a constant axial diameter, and the axial diameter of the outer surface toward the end of the outer surface. The flat part has an arcuate first rolling groove that contacts the first row of rolling elements, and the inclined part has an arcuate shape that contacts the second row of rolling elements. An inner ring in which a second rolling groove is formed, a retainer that holds a first row of rolling elements in contact with the first rolling groove , and the second rolling groove provided in the direction toward the end of the second rolling groove . a separation preventing part for preventing the rolling rolling elements in the second column from the groove is disengaged, the rolling elements of the first row provided at both end portions of the inner ring and the outer ring and A space for accommodating the rolling elements of Me column is characterized in that a plate forming together with the outer ring and the inner ring.

According to the present invention, the first rolling groove in contact with the first row of rolling elements is provided in both the outer ring and the inner ring, and the second rolling groove in contact with the second row of rolling elements is provided only in the inner ring, The first row of rolling elements abuts on the first rolling groove of the outer ring and the inner ring, and the second row of rolling elements abuts on the second rolling groove of the inner ring and the flat portion of the outer ring, so that the second row of rolling elements As a result, the first row of rolling elements and the second row of rolling elements are provided, so that the rotation shaft can be prevented from collapsing. Further, the size can be reduced as compared with the case where two single row bearings are arranged in parallel.

Sectional drawing of the bearing which concerns on embodiment of this invention. Explanatory drawing of the assembly procedure of the bearing which concerns on embodiment of this invention. The side view of Drawing 2 (c). Explanatory drawing of the assembly procedure of the conventional double row bearing. Explanatory drawing of an example of the assembly operation | work which makes the 1st row rolling element contact | abut to a 1st rolling groove .

Embodiments of the present invention will be described below. FIG. 1 is a sectional view of a bearing according to an embodiment of the present invention. The outer ring 11 is formed in a cylindrical shape, and the inner surface has a flat portion 16 having a constant axial diameter. The flat portion 16 is provided with a first rolling groove 12a that contacts the first row of rolling elements 15a. ing. The first rolling groove 12a has a circular cross section. The inner ring 14 is formed in a cylindrical shape, and the outer surface has a flat portion 17 having a constant axial diameter and an inclined portion 18 in which the outer surface diameter decreases in the axial direction toward the end of the outer surface. The flat portion 17 on the outer surface of the inner ring 14 is formed with an arc-shaped first rolling groove 12b that contacts the first row of rolling elements 15a, and the inclined portion 18 has an arc shape that contacts the second row of rolling elements 15b. The second rolling groove 13b is formed. This is the end direction of the second rolling grooves 13b, escape prevention part for preventing the rolling elements 15b of the second row from the second rolling groove 13b is disengaged is provided. The separation preventing unit will be described later.

Next, the first row of rolling elements 15 a and the second row of rolling elements 15 b are balls, and the first row of rolling elements 15 a in contact with the first rolling grooves 12 a and 12 b are spaced apart by a retainer 19. Keep it kept. In addition, plates 20 are provided at both ends of the outer ring 11 and the inner ring 14, and together with the outer ring 11 and the inner ring 14, a space for accommodating the first row of rolling elements 15 a and the second row of rolling elements 15 b is formed. The outer ring 11 is fixed to a member to which a bearing is attached, and the inner ring 14 is fixed to a rotating shaft.

  FIG. 2 is an explanatory view of a bearing assembling procedure according to the embodiment of the present invention, and FIG. 2 (a) shows the outer ring and the inner ring in a state where the first row rolling elements and the second row rolling elements are not mounted. FIG. 2B is a sectional view in which the first row of rolling elements are mounted, and FIG. 2C is a sectional view in which the first row of rolling elements and the second row of rolling elements are mounted.

As shown in FIG. 2A, the inner surface of the outer ring 11 has a flat portion 16 having a constant axial diameter. And the circular arc-shaped 1st rolling groove 12a contact | abutted with the rolling element 15a of the 1st row is provided in the circumferential direction of the flat part 16. As shown in FIG . The outer surface of the inner ring 14 includes a flat portion 17 having a constant axial diameter and an inclined portion 18 in which the diameter of the outer surface decreases in the axial direction toward the end of the outer surface. The flat portion 17 is provided with an arc-shaped first rolling groove 12b facing the first rolling groove 12a of the outer ring 11 and contacting the first row of rolling elements 15a in the circumferential direction. An arcuate second rolling groove 13b with which the second row of rolling elements 15b abuts is provided in the inclined portion 18 in the circumferential direction. This is the end direction of the second rolling grooves 13b, escape prevention part 21 which rolling elements 15b of the second row in contact with the second rolling groove 13b is prevented from being disengaged from the second rolling groove 13b is Is provided.

The separation preventing portion 21 is provided such that the arc edge in the end direction of the outer surface of the inner ring 14 is slightly higher than the arc bottom of the arc of the second rolling groove 13b. The height of the separation preventing portion 21 is high enough to be pushed into the second rolling groove 13b when the second row of rolling elements 15b are brought into contact with the second rolling groove 13b. When the rolling elements 15b of the second roller abut on the second rolling groove 13b, the second rolling elements 15b in contact with the second rolling groove 13b can be prevented from being separated from the second rolling groove 13b. That's it.

Next, from the state where the first row of rolling elements 15a and the second row of rolling elements 15b shown in FIG. 2A are not mounted, the first row of rolling elements 15a and the second row of rolling elements 15b are mounted. The work procedure will be described. First, the first row of rolling elements 15 a are brought into contact with the first rolling groove 12 a of the outer ring 11 and the first rolling groove 12 b of the inner ring 14. As in the case of the conventional example shown in FIG. 5, this work is performed by placing the inner ring 14 eccentrically in the outer ring 11, inserting the first row of rolling elements 15 a between the outer ring 11 and the inner ring 14, As indicated by the arrows, the rolling elements 15a are pushed into a narrow space between the outer ring 11 and the inner ring 14 and are sequentially brought into contact with the first rolling grooves 12a and 12b. Thereby, as shown in FIG.2 (b), the rolling element 15a of the 1st row is mounted | worn with 1st rolling groove 12a, 12b.

Next, in order to mount the second row of rolling elements 15b from the state in which the first row of rolling elements 15a shown in FIG. 2B is mounted in the first rolling grooves 12a and 12b, the second row The rolling element 15b is sequentially pushed into the second rolling groove 13b of the inner ring 14. In this case, the second row of rolling elements 15b are guided by the inclined portion 18 on the outer surface of the inner ring 14 and come into contact with the second rolling groove 13b. On the other hand, since the outer race 11 is not provided with the second rolling groove , when the second row of rolling elements 15b comes into contact with the second rolling groove 13b, the second row of rolling elements is located at the position of the outer ring 11. It abuts at the flat portion 16. As a result, as shown in FIG. 2C, the first row of rolling elements 15a and the second row of rolling elements 15b are mounted.

3 is a side view of FIG. 2 (c), FIG. 3 (a) is a right side view, and FIG. 3 (b) is a left side view. In FIG. 3A, the first row of rolling elements 15 a that are in contact with the first rolling grooves 12 a and 12 b are held by the retainer 19 at a constant interval. In addition, illustration of the retainer 19 is abbreviate | omitted in FIG.2 (c).

On the other hand, the second row of rolling elements 15b are mounted so as to form a full ball bearing between the outer ring 11 and the inner ring 14 as shown in FIG. The second rolling groove 13b is formed so that the second row of rolling elements 15b are arranged close to each other, and the size of the second row of rolling elements 15b also corresponds to the second rolling groove 13b. It is the size that is placed close to when touching. The second row of rolling elements 15b is shown in FIG. 3 (b) in the case where a full ball bearing is formed. However, the second row of rolling elements 15b may be held by the retainer 19 at a constant interval. Good.

Thus, the bearing of the embodiment of the present invention basically takes the form of a double row bearing, but the rolling groove is one row of the first rolling grooves 12a and 12b of the first rolling element 15a. The second row of rolling elements 15b is only the second rolling groove 13b provided in the inner ring 14, and the second rolling groove is not provided in the outer ring 11. Thereby, matching of the diameter of the rolling element 15b of the 2nd row with respect to the 2nd rolling groove 13b becomes unnecessary, and an assembly man-hour can be reduced. Moreover, since it takes the form of a double-row bearing, the shaft collapse can be suppressed to some extent with one bearing according to the embodiment of the present invention, and space can be saved as compared with the case where two single-row bearings are used.

In the above description, the inclined portion 18 is provided on the outer surface of the inner ring 14, and the arc-shaped second rolling groove 13 b with which the second row of rolling elements 15 b abut is provided on the inclined portion 18, but instead of the inner ring 14. Alternatively , an inclined portion 18 may be provided on the inner surface of the outer ring 11, and an arcuate second rolling groove 13b with which the second row of rolling elements 15b abuts may be provided on the inclined portion 18.

That is, the inner surface of the outer ring 11 formed in a cylindrical shape, provided with an inclined portion 18 the diameter of the axial direction of the inner surface towards the end of the flat portion 17 and the inner surface is a diameter of the axial constant increases, flat An arc-shaped first rolling groove 12a that contacts the first row of rolling elements 15a is formed in the portion 17, and an arc-shaped second rolling groove 13 that contacts the second row of rolling elements is formed in the inclined portion. Form. On the other hand, a flat portion 16 having a constant axial diameter is provided on the outer surface of the inner ring 14 formed in a cylindrical shape, and the flat portion 16 faces the first rolling groove 12 a provided on the inner surface of the outer ring 11. The arc-shaped first rolling groove 12b is formed so as to be in contact with the first row of rolling elements 15a, and is formed so as to be in contact with the second row of rolling elements 15b at the flat portion 16. In this case, the same effect can be obtained.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 11 ... Outer ring, 12 ... 1st rolling groove , 13 ... 2nd rolling groove , 14 ... Inner ring, 15a ... 1st row rolling element, 15b ... 2nd row rolling element, 16 ... Flat part, 17 ... Flat , 18 ... inclined part, 19 ... retainer, 20 ... plate, 21 ... separation prevention part

Claims (3)

The cylindrical inner surface has a flat portion with a constant axial diameter, and the flat portion is formed with an arc-shaped first rolling groove that contacts the first row of rolling elements. The moving body is an outer ring that comes into contact with the flat part,
The outer surface has a flat portion having a constant axial diameter and an inclined portion in which the outer surface has a smaller axial diameter toward the end of the outer surface. an inner ring rolling elements the second column in the inclined portion arcuate first rolling groove in contact is formed arc-shaped second rolling groove in contact is formed with the moving object,
A retainer for holding a first row of rolling elements in contact with the first rolling groove ;
A separation preventing part for preventing the rolling elements of the second column is detached from the second rolling groove provided in the end portion direction of the second rolling grooves,
A bearing comprising: a plate which is provided at both ends of the outer ring and the inner ring and which forms a space for accommodating the first row of rolling elements and the second row of rolling elements together with the outer ring and the inner ring. Is formed on the inner cylindrical surface is of Me 1 row in the flat portion and an inclined portion the diameter of the axial direction of the inner surface towards the end of the flat portion and the inner surface is a diameter of the axial constant increases rolling an outer ring rolling elements the second column in the inclined portion arcuate first rolling groove in contact is formed arc-shaped second rolling groove in contact is formed with the moving object,
The outer surface has a flat portion with a constant axial diameter, and the flat portion has an arc-shaped first rolling groove that contacts the first row of rolling elements, and the second row of rolling elements. The moving body is an inner ring that comes into contact with the flat part,
A retainer for holding a first row of rolling elements in contact with the first rolling groove ;
A separation preventing part for preventing the rolling elements of the second column is detached from the second rolling groove provided in the end portion direction of the second rolling grooves,
A bearing comprising: a plate which is provided at both ends of the outer ring and the inner ring and which forms a space for accommodating the first row of rolling elements and the second row of rolling elements together with the outer ring and the inner ring. The bearing according to claim 1 or 2, wherein the second row of rolling elements is mounted so as to form a full ball bearing between the outer ring and the inner ring .

Images