CZ294980B6 - High-speed bearing, particularly for mounting spindleless spinning machine spinning rotor - Google Patents

Abstract

The present invention relates to a high-speed bearing comprising a shaft (1) and a cylindrical bush (2) both having a pair of apart situated steel races. Each steel race accommodates one row of rolling bodies (3) guided by a cage (4). In each row of the rolling bodies (3) at least one rolling body (3) is made of silicon nitride Sii3Ni4 and the remaining rolling bodies (3) are made of steel, whereby in each row of the rolling bodies (3) the number of rolling bodies (3) made of silicon nitride Sii3Ni4 is less than the number of steel-made rolling bodies (3).

Description

Technical field

The invention relates to a high-speed bearing, in particular for supporting a spinning rotor of an open-end spinning machine comprising a shaft and a cylindrical bush, both with a pair of spaced apart steel raceways, one in each of which a row of roller-guided rollers.

BACKGROUND OF THE INVENTION

High-speed bearings are known, in particular for supporting a spinning machine spindle, which comprise a steel shaft with a pair of spaced apart raceways and a cylindrical steel sleeve also with a pair of equidistantly located raceways. In the orbits are placed steel rolling bodies, which are guided by steel cages.

The disadvantage of this arrangement is that at high speeds the raceways are overloaded with relatively heavy steel rolling elements, which greatly reduces the bearing life.

In order to overcome this drawback, a solution has been proposed according to CZ patent 281 421 which relates to a high-speed bearing, in particular for a spinning machine comprising a shaft with a pair of spaced apart steel raceways and a cylindrical bushing also with a pair of spaced apart steel raceways. tracks in which rolling elements are guided by metal cages, the rolling elements being made of technical ceramics.

The relative advantage of this arrangement is the high bearing life at high speeds, but this is achieved only at the cost of such a bearing, since it is necessary to use a large number of precision ceramic rolling elements, which are very expensive.

The object of the invention is to propose a high-speed bearing, in particular for supporting the spinning rotor of an open-end spinning machine, with a sufficient service life and lower cost.

SUMMARY OF THE INVENTION

The object of the invention is achieved by a high-speed bearing, in particular for supporting the spinning rotor of an open-end spinning machine, characterized in that in each row of rolling elements at least one of the rolling elements is Si ₃ N ₄ and the remaining rolling elements are steel. in each row of rolling elements, the number of Si ₃ N ₄ silicon nitride rolling elements is less than the number of steel rolling elements.

This arrangement of the high-speed bearing, in particular for supporting the spinning rotor of the open-end spinning machine, results in a reduction in the cost of the bearing while maintaining a sufficient bearing life at high speed.

Overview of the figure in the drawing

The invention is shown schematically in the drawing, which shows a longitudinal section of a high-speed bearing for receiving a spinning rotor of an open-end spinning machine.

DETAILED DESCRIPTION OF THE INVENTION

The high-speed bearing, in particular for accommodating the spinning rotor of an open-end spinning machine, comprises a shaft 1 and a cylindrical bush 2 both with a pair of spaced apart pair of steel orbits, each with a row of rolling bodies 3 guided by the cages. is provided with a seal 5 at both ends and a clamping ring 6 on the outer surface.

Part of the rolling bodies 3 in each row of rolling bodies 3 is made of steel and part of the rolling bodies 3 in each row of rolling bodies 3 is made of silicon nitride Si ₃ N ₄ , wherein in each row of rolling bodies 3 the number of rolling bodies 3 is silicon nitride Si ₃ N ₄ is less than the number of rolling elements 3 toughening, i.e. in each row of the rolling elements 3, the ratio of the number of the rolling elements 3 of silicon nitride Si ₃ N ₄ to a number of rolling bodies 3 made of steel is less than 1. in each row of rolling Thus, at least one rolling body 3 is always made of silicon nitride Si ₃ N ₄ and at least one rolling body 3 made of steel.

In view of the dynamic effects of the rotating masses, it is desirable if the rolling bodies 3 of the individual materials in each row of rolling bodies 3 are regularly distributed around the circumference of the raceways.

Claims (1)

PATENT CLAIMS A high-speed bearing, in particular for supporting a spinning rotor of an open-end spinning machine comprising a shaft and a cylindrical bush, both with a pair of spaced apart steel orbits, each of which houses one row of cage-guided rolling elements, for each row of rolling elements (3) at least one of the rolling elements (3) is made of silicon nitride Si ₃ N ₄ and the remaining rolling elements (3) are steel, with each number of rolling elements (3) having a number of rolling elements (3) Silicon nitride Si ₃ N _{4 is} less than the number of steel rolling elements (3).