JPH0144806Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) This invention relates to the improvement of cross roller bearings used, for example, in the rocking rotation of the joints of robots. The object of the present invention is to provide a cross roller bearing that allows easy centering of two wheels.

(Prior art) Conventionally known cross roller bearings include:
For example, as shown in Figure 1 of Japanese Utility Model Application Publication No. 59-1928 or Figure 1 of Japanese Utility Model Application Publication No. 58-163714, an outer ring or an inner ring having V-shaped raceways facing each other may be used. For assembly as a bearing, one of the raceway rings is formed by two rings that are bisected from the groove bottom of the raceway along a plane substantially perpendicular to the axis.

However, the rings of the above bearings are not integrally connected to each other, so if the bearings are handled incorrectly during transportation or assembly into equipment, the split rings may come apart, causing the rollers to fall apart. There was a problem that the cage separated.

As a means to prevent such separation, for example, bolt holes are provided in the wheel body, and after the bearing is assembled,
It is also known that the wheel body is tightly integrated with bolts, but in such an integrated type, centering (correction of radial deviation) before fixing the bolts is done by rollers. However, in most cases, the rings are fixed without undergoing sufficient break-in rotation, so the rings are joined with a slight deviation in the radial direction from each other. Therefore, for example, if the outer ring is formed by joining two rings, and when this is assembled into the bore of the housing, the fitting clearance between the outer diameter of the outer ring and the inner diameter of the bore will be Not only is assembly difficult because of the This caused problems in terms of lifespan and performance.

(Purpose) This invention not only prevents the cage and rollers from separating during handling of the bearing, but also reliably adjusts misalignment between the wheels when assembling the bearing into equipment, thereby improving load distribution. The purpose of this invention is to obtain a bearing that has uniform rotational speed, low torque, good rotational performance, and long life.

(Structure) That is, in this invention, either the outer ring or the inner ring is composed of two rings divided into two along a plane substantially perpendicular to the axis, and the rings are arranged in a radial direction. When assembling into the device, movement is achieved by fitting the raceway ring (outer ring or inner ring) consisting of the two rings into the fitting part of the mating member. This alignment eliminates the problems associated with the conventional complete connection.

(Example) Next, an example of the cross roller bearing of this invention shown in the figure will be described. 1 is an outer ring, 2 is an inner ring, and 3 is a 90-degree V-shape formed on the facing surfaces of the outer ring and the inner ring. 4 is a retainer having pockets for holding and guiding the plurality of rollers arranged, and 5 is a sealing body fixed to the outer ring.

The outer ring 1 consists of a combination of two ring bodies 11 and 12 that are divided into two along a plane substantially perpendicular to the axis, and the ring bodies 11 and 12 are opposed to each other, and
It has a plurality of rivet holes 13 formed at appropriate intervals in the circumferential direction, and is integrally joined by rivets 14 inserted into the rivet holes 13 with a degree of freedom in the radial direction.

In this case, of course, the rivet hole 1
The outer diameter of the rivet 14 with respect to 3 is the ring body 11, 1
2 is formed with sufficient tolerance to allow radial movement as necessary for alignment during assembly into the device. In the figure, reference numeral 15 indicates a counterbore to prevent the rivet head from protruding beyond the end surface of the outer ring.

In the embodiment, the outer ring 1 has two ring bodies 11, 1.
Although an example has been described in which the outer ring 2 is formed from one member, the inner ring 2 may be formed from two rings. Further, the coupling means is not limited to rivets, but any known coupling means may be used.

(Operation and Effect) As mentioned above, in the cross roller bearing of this invention, the bearing ring formed by two rings of the outer ring or the inner ring is integrally connected with a degree of freedom in the radial direction. Therefore, it goes without saying that separation of the rollers and cage is prevented during handling. For example, if the outer ring is formed of two rings, this can be inserted into the bore of the housing and the outer circumferential surface of the outer ring By fitting and fitting together,
The wheels are aligned with each other along the inner peripheral surface of the bore, and fixed with the misalignment between the wheels corrected.

Therefore, the local load due to the conventional misalignment,
It has high performance and can withstand long-term use without poor rotational accuracy or uneven torque.

In particular, when a rivet is used to connect two rings as in the example, the diameter of the rivet itself can be made very small, so it is particularly effective for bearings with thin rings in the radial direction. becomes.

[Brief explanation of the drawing]

The drawing is a sectional view of the main parts of the cross roller bearing of this invention. In the symbols of the embodiment, 1 is an outer ring, 11 and 12 are rings, 2 is an inner ring, 3 is a roller, 4 is a cage, 5 is a seal body, 13 is a rivet hole, and 14 is a rivet.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of rollers are arranged between V-shaped tracks formed on opposing surfaces of a pair of mutually opposing outer rings and inner rings, and the outer ring or the inner ring In a cross roller bearing consisting of a combination of rings in which one of the bearing rings is divided into two by a plane substantially perpendicular to the axis, the rings are connected to each other with a degree of freedom in the radial direction. A cross roller bearing characterized by: (2) A cross roller bearing according to claim 1, in which the wheels are connected to each other by rivets.