JPS598008Y2 - Conrad type double row angular contact ball bearing - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a Conrad type double-row angular contact ball bearing with a large moment load capacity.

Conventional Conrad-type double-row angular contact ball bearings (hereinafter abbreviated as bearings).

) is assembled using an automatic machine by inserting two rows of balls 3 between an inner ring 1 and an outer ring 2, as shown in FIG.

By the way, since the moment load capacity of the bearing is related to the steel ball spacing P1, that is, the raceway groove spacing P1, the capacity can be increased by increasing the steel ball spacing P2 as shown in FIG.

However, in the slave bearing, the distance e1 between the shoulders 5 of the raceway groove 4 increases to e2 by the amount that the distance P1 between the steel balls increases to P2.

By the way, as shown in Fig. 3 and Fig. 4, the automatic machine has an outer ring supporting jig 6a and an outer ring supporting piston jig 6b.
The ball 3 is inserted into the crescent-shaped gap created by making the inner ring 1 eccentric, and the ball 3 is inserted into both raceway grooves 4 using the ball supporting piston jig 7.
If the distance e2 is longer than the ball diameter as shown in Fig. 4, when the balls are inserted, two balls will rest on the outer diameter surface sandwiched by the shoulders on both sides, so the balls will not fit properly. They cannot separate into two rows and enter their respective raceway grooves.

For this reason, there is a limit to the steel ball spacing P2 when assembly is performed using an automatic machine, and it has therefore been impossible to assemble a bearing with a large moment load capacity.

8 is a piston jig for pushing the inner ring. The purpose of this invention is to eliminate these conventional drawbacks and provide a bearing that can be assembled using an automatic machine even if the distance between the raceway grooves is long compared to the ball diameter. The raceway grooves of the outer ring are connected by a conical surface, a spherical surface, or a combination thereof, or the inner diameter surface of the outer ring and the raceway grooves of the outer ring are connected by a similar surface.

Alternatively, connect both the inner and outer rings using similar surfaces,
The present invention relates to a bearing in which the spacing between the waste portions of each raceway groove is selected so that two balls, one in contact with each of these inclined surfaces, are divided into two rows and enter the respective raceway grooves.

An embodiment of this invention will be explained below with reference to the drawings. In Fig. 5, the outer ring 2 has the same shape and dimensions as the outer ring in Fig. 2, and balls 3 are inserted in two rows between it and the inner ring 1, and the steel balls are P2 is equally wide as the bearing in FIG.

However, the inner ring 1 is provided with eyebrow parts 5, 5 at the center of the outer diameter surface with a spacing e1 equal to e1 in FIG. They are connected by an inclined surface 9a.

Therefore, the portion of the outer diameter surface sandwiched between the shoulders 5, 5, that is, the distance e1 between the shoulders is narrower than the sum of the radii of both balls 3.

FIG. 6 shows how the bearing according to the invention shown in FIG. 5 is assembled using the same automatic machine as shown in FIG. 4.

In the case of this bearing, since the cylindrical portion of the outer diameter surface of the inner ring 1 is e1 as shown in the figure, the two balls 3 are both in contact with the inclined surfaces 9a on both sides, and the inner ring is pushed in by the piston jig 8 for pushing the inner ring. If you press 1 and sandwich ball 3 between the inner and outer rings, 2
The balls 3, 3 are guided by the inclined surfaces 9a, 9a, respectively, separated, and then entered into both raceway grooves 4 and assembled.

The contact ellipse 10 in the raceway groove of the balls 3 in the assembled bearing is in the normal position as shown in Figure 7, and has no effect on the bearing's radial load and thrust load capacity or the bearing life. .

The embodiment shown in FIG. 8 is almost the same as the embodiment shown in FIG. 5, except that the inclined surface 9b connecting the eyebrow portion 5 and the raceway groove 4 is a spherical surface with a convex outward.

Note that the outer diameter surface having a length e1 held between both shoulders 5 is a cylindrical surface, but instead of being a cylindrical surface, it may be an outwardly convex spherical surface continuing to the inclined surface 9b.

The embodiment shown in FIG. 9 is almost the same as those shown in FIGS. 5 and 8, but the inclined surface 9C connecting the shoulder portion 5 and the raceway groove 4 is not a spherical surface but a conical surface.

It is exactly the same that the two inserted balls contact different inclined surfaces 9C, and are guided by the inclined surfaces 9C and inserted and assembled into separate raceway grooves by an automatic machine.

In the embodiment shown in FIG. 10, the raceway groove 4 of the inner ring 1 has no inner groove wall and has a continuous common cylindrical surface on the inside.

The inner diameter surface of the outer ring 3 is provided with shoulder portions 5a, 5a having a mutual spacing of e1, and these shoulder portions 5a are connected to the raceway grooves 4a, 4a, respectively, by a conical surface 9d.

In this case, when assembled using an automatic machine, the ball is placed on the inclined surface 9.
d, the raceway grooves 4a are separated into two rows, each with a separate raceway groove 4a.
inserted into.

The embodiment shown in FIG. 11 is almost the same as that shown in FIG. 10, except that the inclined surface 9b connecting the shoulder 5a on the inner diameter surface of the outer ring and the raceway groove is spherical.

Note that the contact point between the ball and the raceway groove of the outer ring is within the raceway groove 5a, and the contact ellipse is located at a regular position similar to the contact ellipse 10 in FIG. 7.

The one shown in Fig. 12 is an embodiment in which both the inner and outer rings are provided with inclined surfaces connecting the shoulders and the raceway grooves.The inner ring has an inclined surface 9C made of a conical surface as in Fig. 9, and the outer ring has an inclined surface 9C as shown in Fig. 10. Similarly, the inclined surface 9d is a conical surface.

The distance between the shoulders 5 and 5a of the inner and outer races is e1, which is smaller than the sum of the radii of the balls in both rows.

In the embodiment shown in FIG. 13, the inclined surface connecting the scrap portion and the raceway groove is an inclined surface 5b made of an outwardly convex spherical surface on the inner ring as in FIG. 8, and an outwardly convex inclined surface 5e on the outer ring as in FIG. The embodiment is completely the same as the embodiment shown in FIG. 12 except that.

As shown in the above-mentioned embodiments, even if the distance between the steel balls, that is, the distance between the raceway grooves is widened to P2, unlike conventional bearings, the scrap portions 5, 5a of the two raceway grooves 4, 4a are The spacing between them is set to e1, which is narrower than the sum of the radii of the balls 3 in both rows, and these scrap parts are connected to the raceway surface with an inclined surface, so that the two balls inserted by the automatic machine have separate slopes. They will be in contact with the surfaces, and guided by these slopes, they will be able to
They will be separated in different directions and accommodated in separate raceway grooves.

Therefore, even if the distance between the steel balls is widened, assembly can be performed using an automatic machine, so that it is possible to obtain a Conrad type compound angular contact ball bearing that can be easily assembled automatically and has a large moment load capacity.

Also, the contact ellipse can be made exactly the same as the conventional product.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the upper half of a Conrad type double-row angular contact ball bearing assembled using a conventional automatic machine. Figure 2 is a version of the bearing in Figure 1 with larger raceway groove spacing to increase moment load capacity. FIG. 3 is a plan view for explaining assembly using an automatic machine; FIG. 4 is a cross-sectional view for explaining how a conventional bearing with a larger raceway groove spacing is assembled using an automatic machine; Figure 5 is a vertical sectional view of the upper half of an embodiment of the bearing of this invention, Figure 6 is a sectional view illustrating how the bearing of Figure 5 is assembled by an automatic machine, and Figure 7 is a contact diagram of the bearing of this invention. An upper half longitudinal sectional view for explaining the position of the ellipse, and FIGS. 8 to 13 are upper half longitudinal sectional views of other embodiments, respectively. 1...Inner ring, 2...Outer ring, 3...
... Ball, 4, 4a ... Raceway groove, 5, 5a.
...Shoulder part, 9a, 9b, 9C, 9d, 9e...
... Inclined surface, 10... Contact ellipse, e0...
...Distance between eyebrows.

Claims (1)

[Scope of utility model registration request] The distance e1 between the shoulders of the two raceway grooves of either or both of the inner ring and the outer ring is narrower than the sum of the radii of the balls inserted into both raceway grooves, and the shoulders and the raceway groove are connected by an inclined surface, This is a Conrad type double-row angular contact ball bearing in which the contact ellipse on the raceway surfaces of the inner and outer rings of the balls is positioned at the correct position.