JPH0461971B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a type of bearing that supports both radial loads and axial loads (thrust loads).

(Prior Art and its Problems) As this type of bearing device, a compound bearing such as a combination of two bearings and a cross roller bearing is known. These bearing devices absolutely require an inner ring raceway surface, and also require a cage for providing rolling elements on the inner circumference of the bearing. This also limits the range of use of bearings.

(Object of the Invention) An object of the present invention is to provide a bearing device of the above type that does not require an inner raceway surface or a cage.

(Structure of the Invention) In order to achieve this object, the present invention includes a circular outer ring, an inner ring disposed inside the outer ring and having an outer diameter smaller than the inner diameter of the outer ring, and an inner ring disposed between the outer ring and the inner ring. a roller groove extending in the circumferential direction of the outer ring; and an axial track extending in the circumferential direction and parallel to the central axis of the bearing device. and each of both side surfaces of the roller groove is a radial raceway surface extending in a direction perpendicular to the central axis of the bearing device, and the roller means is formed with a surface of the bearing device. A plurality of radial rollers are provided on the inner ring having rotational axes parallel to the central axis and are engaged with the axial raceway surface of the outer ring; a plurality of thrust rollers, each of which has a
The roller groove includes a thrust roller rollingly engaged with one radial raceway surface of the roller groove, and a thrust roller rollingly engaging the other radial raceway surface of the roller groove. Provides bearing devices.

(Function) In the above configuration, the thrust roller rolls along the radial raceway surface in the roller groove of the outer ring to support the axial load, and the radial roller rolls along the axial raceway surface on the inner peripheral surface of the outer ring. It rolls around and supports radial loads.

(Example) Hereinafter, the present invention will be explained in more detail with reference to preferred embodiments shown in the accompanying drawings.

First, referring to FIG. 1, the embodiment of the bearing shown here includes a circular outer ring 10, a circular inner ring 12 disposed inside the outer ring, and having an outer diameter slightly smaller than the inner diameter of the outer ring 10. these outer rings,
The center of rotation of the inner ring, ie, the central axis of the bearing device, is indicated by R.

The outer ring 10 consists of two outer ring parts 14, 16 divided in the axial direction, and these outer ring parts 14, 1
6 are brought together and secured together by bolt and nut means 18. The inner peripheral surface of the mating surface of each outer ring portion 14 and 16 is counterbored, and these counterbores cooperate to form an annular roller groove 20 extending in the circumferential direction on the inner peripheral surface of the outer ring 10. ing. In the illustrated embodiment, the roller groove 20 is
Both side wall surfaces 20A and 20B serve as radial raceway surfaces for the rollers.

The inner circumferential surface of the outer ring 10 that has come off the roller groove 20 is an axial raceway surface 22 that extends in the circumferential direction, and these raceway surfaces 20A, 20B, 22 are ground and hardened to make the roller precise. It shall be a rolling raceway surface.

Inner ring 12 includes a plurality of thrust rollers 24 (see also FIG. 2) at predetermined intervals that project radially from its outer surface (ie, the side facing outer ring 10). These thrust rollers 2
4 has a rotation axis extending in the radial direction of the inner ring, and is positioned within the roller groove 20 of the outer ring 10 during assembly, so that its radial raceway surfaces 20A and 20B are engaged with each other. In particular, as can be seen in FIG. 2, the thrust roller 24 must engage only one side of the roller groove 20, that is, the raceway surface. Therefore, the distance between the side walls of the roller groove 20, that is, the width of the roller groove 20, is slightly larger than the outer diameter of the thrust roller 24, and when the thrust roller 24 is engaged with one raceway surface, the width of the roller groove 20 is slightly larger than the outer diameter of the thrust roller 24. is a gap G from the opposite raceway surface.
(Fig. 2). In the illustrated embodiment, every other thrust roller 24 engages with the raceway surface on the opposite side so as to support loads applied in opposite directions in the axial direction.

With reference to FIGS. 1 and 2 together, inner ring 1
2 further includes a plurality of radial rollers 26 disposed at predetermined intervals in the circumferential direction, and in the illustrated embodiment, these radial rollers 26 have an annular step 28 formed at one end of the inner ring 12 at its outer periphery. It has a rotation axis parallel to the rotation axis of the inner ring 12. The radial roller 26 is rollingly engaged with the axial raceway surface 22 of the outer ring 10 and supports the load in the radial direction.

The above-mentioned radial roller 26 is rotatable around a fixed shaft 26a whose upper part in FIG. It has a rolling element 26b that fits therein. The thrust roller 24 also has a similar fixed shaft and rolling elements.

(Effects of the Invention) According to the above configuration, the thrust roller 24 is engaged with the radial raceway surface of the roller groove 20 of the outer ring 10 to support the load in the axial direction, and the radial roller 26 is engaged in the axial direction of the outer ring circumferential surface. The raceway surface is engaged to support the load in the radial direction.

Therefore, since there is no raceway surface on the inner ring, the degree of freedom in machining increases and the range of use is expanded. Furthermore, since a cage is not required on the inner periphery of the bearing, there is no dimensional restriction due to the cage, and the shape of the bearing can be designed in any way. Since the load capacity depends on the load capacity of the rollers and the number of rollers, it is easy to match the load conditions, and the device can be optimally designed.

In the present invention, the radial roller is engaged with an axial track surface parallel to the central axis of the bearing device and receives only a radial load, while the thrust roller is applied in a direction perpendicular to the central axis. It rolls into engagement with the extending radial raceway surface and receives only thrust loads. The thrust roller includes a thrust roller that engages with a radial raceway surface on one side of the roller groove, and a thrust roller that engages with a radial raceway surface on the other side of the roller groove. , it is possible to support thrust loads that act in both axial directions (that is, in both the up and down directions in FIGS. 1 and 2).

In this way, the bearing device of the present invention is capable of supporting a radial load and a thrust load acting in both directions of the axis. Then, both sides of the roller groove are made radial raceway surfaces, and a thrust roller protruding radially from the side surface of the inner ring is engaged with one of the radial raceway surfaces,
In addition, with a simple and unique configuration in which the other thrust roller is engaged with the other radial raceway surface, it is possible to support thrust loads acting in both directions in the axial direction. Further, the configuration in which the axial raceway surface and the radial raceway surface are not inclined with respect to the central axis of the bearing device provides the advantage that machining of the raceway surface is facilitated. Furthermore, since the rollers receiving only thrust loads and the rollers receiving only radial loads are separately incorporated into the bearing device, there is an advantage that the types of rollers that can be used are not limited.

[Brief explanation of the drawing]

FIG. 1 is a fragmentary vertical sectional view of a bearing device according to an embodiment of the present invention. 2 is a partially cutaway side view of the bearing device of FIG. 1. FIG. In the drawings, 10...outer ring, 12...inner ring,
14, 16... Outer ring portion, 18... Bolt/nut means, 20... Roller groove, 20A, 20B...
Radial raceway surface, 22... Axial raceway surface, 24
...Thrust roller, 26...Radial roller.

Claims (1)

[Claims] 1. A bearing device including a circular outer ring, an inner ring arranged inside the outer ring and having an outer diameter smaller than the inner diameter of the outer ring, and roller means arranged between the outer ring and the inner ring, wherein the outer ring A roller groove extending in the circumferential direction and an axial raceway surface extending in the circumferential direction and parallel to the central axis of the bearing device are formed on the inner diameter surface, and both side surfaces of the roller groove each is a radial raceway surface extending in a direction perpendicular to the central axis of the bearing device, and the roller means has a rotational axis parallel to the central axis of the bearing device. a plurality of radial rollers provided on the outer ring and in rolling engagement with the axial raceway surface of the outer ring, and a plurality of thrust rollers provided protruding in the radial direction from a side surface of the inner ring, the thrust rollers is characterized in that it includes a thrust roller that is rollingly engaged with one radial raceway surface of the roller groove, and a thrust roller that is rollingly engaged with the other radial raceway surface of the roller groove. bearing device.