DE10057175A1 - Plastic cage for friction bearings, designed with same inner diameter of rings, bridges, and spring elements in order to be economically molded - Google Patents

Abstract

The journals are guided between the inner and outer ring (1, 2) and supported by hook-shaped spring elements (6, 7) permanently joined to a recess (5) provided in the bridges (3) in order to offer a space for the spring (6, 7) when it is moved. The rings (1, 2), bridges (3), and spring elements (6, 7) are all of the same inner diameter, facilitating the injection molding by using a simple cylindrically shaped core with a smooth outer surface.

Description

The present invention relates to a plastic cage for a pinch roller freewheeling. Such a plastic cage is, for example, from EP 0 176 767 A1 known. The plastic cage has rim rings and rim rings binding webs that limit the cage window, with a in the cage window gripping spring arms are provided for springing pinch rollers. The Spring arms are integrally formed on one of the two flange rings. The Ste ge and the spring arms each extend only over part of the radial Heights of the rim ring, the spring arm being offset radially to the web in one such a position on the rim that the spring arm is attached to the rim zenden web covered freely movable in the circumferential direction. The advantageous type order of the webs and the spring arms to each other, however, requires a agile injection mold.

The object of the present invention is therefore to provide a plastic cage specify the features of the preamble of claim 1, which is simply in the manufacture is.

According to the invention, this object is achieved in that the rim rings and the webs and the spring arms have a common inner diameter sen. In the plastic cage according to the invention, a simple cylindri shear core with smooth outer surface can be used for the injection mold.  

This core can be easily extracted after the plastic cage has been sprayed out and be pulled axially out of the tool. With the be Known plastic cage must have a profiled core with projections or Aus take on the scope are provided so that the coordination of the Injection mold is much more complex. Also arise because of of the profiled core very thin cross sections on the cage, which are susceptible to Damage.

The spring arm is preferably at one axial end of each web integrally formed, and extends towards the other axial end of the jetty. The full window width in the axial direction can thus be used become, d. H. long pinch rollers can be used.

In order to ensure a sufficiently large travel, it is proposed that that the web has a pocket facing the cage window into which the Spring arm can compress. The axial extent preferably corresponds to the Pocket at least the axial extension of the spring arm. Thus, the Completely immerse the spring arm in the pocket. The cage window becomes this follow the spring arm not unnecessarily reduced. As a result, large Pinch rollers are used.

The spring arm preferably has a clamp at its free end roll facing, opposite to the spring arm angled federela rags. This resilient flap serves to increase the Flexibility of the spring arm.

The invention is illustrated below using one of a total of two figures illustrated embodiment explained in more detail. Show it:

Fig. 1 shows a cross section through an inventive plastic cage and

Fig. 2 shows a detail of the plastic cage according to FIG. 1 in plan view.

The plastic cage according to the invention shown in FIGS . 1 and 2 comprises flange rings 1 , 2 which are integrally connected to one another by webs 3 . The webs 3 limit cage window 4 for receiving not shown Darge pinch rollers. The web 3 is provided with a pocket 5 , which is opened in the direction of the cage window 4 . The pocket 5 extends over most of the web 3 . At one axial end of the pocket 5 , a spring arm 6 is integrally formed on the web 3 . The spring arm 6 is slightly inclined to the web 3 for a spring. At its free end, the spring arm 6 has a spring-elastic tab 7 , which faces the clamping rollers (not shown) and is angled opposite to the spring arm 6 .

Of FIG. 1 it can be seen that the flange rings 1, 2 and the webs 3 and the spring arms 6 with the formed tabs 7 have a common inner diameter. In this embodiment of the plastic cage according to the invention, injection molds with a simple cylindrical core with a smooth outer surface can be used.

reference numerals

1

board ring

2

board ring

3

web

4

cage window

5

bag

6

spring arm

7

cloth

Claims (6)

1. Plastic cage for a clamping roller freewheel, with border rings ( 1 , 2 ) and the border rings ( 1 , 2 ) connecting webs ( 3 ), the cage window ( 4 ) limit, spring arms ( 6 ) engaging in the cage window ( 4 ) for springing Pinch rollers are provided, wherein a spring arm ( 6 ) is integrally formed on one end of the plastic cage, which extends in the direction of the other end of the plastic cage, characterized in that the flange rings ( 1 , 2 ) and the webs ( 3 ) and the spring arms ( 6 ) have a common inner diameter. 2. Plastic cage according to claim 1, in which at one axial end of each web ( 3 ) a spring arm ( 6 ) is integrally formed, which extends in the direction of the other axial end of the web ( 3 ). 3. Plastic cage according to claim 1, wherein the web ( 3 ) has a Käfigfen ster ( 4 ) facing pocket ( 5 ) into which the spring arm ( 6 ) can deflect. 4. Plastics cage according to claim 3, wherein the axial extent of specific Ta (5) at least corresponds to the axial extent of the spring arm (6). 5. Plastic cage according to claim 3, wherein the spring arm ( 6 ) within the pocket ( 5 ) is integrally formed on the web ( 3 ). 6. A plastic cage according to claim 1, wherein the spring arm ( 6 ) has at its free end a spring-elastic tab ( 7 ) that faces the pinch rollers and is angled opposite to the spring arm ( 6 ).