DE8536163U1 - Adjustable plain bearing - Google Patents

Description

1 28.07.1987» 1303A

Hinrichsen/Th 9862 G 85 36 163.1

Adjustable plain bearing

The invention relates to a plain bearing for rotating or longitudinally guided components with an automatically adjustable bearing shell part.

Such a plain bearing is known from DE-PS 23 03 OS1. In this ^case , an adjustable bearing is achieved by means of a bearing sleeve which has a tapered part at one end which is divided into segments by four slots. When the bearing sleeve is inserted onto a shaft, the tapered part spreads out and constantly presses against the shaft with its front tapered edge. This bearing is only intended for devices subject to low loads because the bearing sleeve essentially only rests on the outermost end. With greater and longer loads, the outer tapered edge would grind an ever deeper groove into the shaft.

The invention is based on the object of providing a plain bearing of the single- I

&iacgr; ■ to create a bearing of the type mentioned above which always rests evenly on the rotating or longitudinally guided component. This object is achieved by the features characterized in the claims.

The bearing shell parts can be used both as a highly stressed bearing for a rotating shaft and a longitudinally movable guide rod and for the bearing of a piston in a cylinder. A particularly advantageous application is for plain bearings that are to be used in absolutely dry running conditions, where the bearing shells cannot be replaced or maintained. Even with these otherwise risky bearings, a long service life can be guaranteed because bearing play due to wear is completely avoided. By using the plain bearing, running times can be achieved that bring advantages despite the small additional cost in production. The parts required for the plain bearing are either cheap purchased parts or easy to manufacture. A

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28.07.1987, 1303A

Hinrichsen/Th

9862

Another advantage is that in both designs, the arrangement of the spring-loaded balls in the conical annular spaces effectively prevents the bearing shell parts from slipping back in the event of vibrations, impacts, etc. by jamming the balls. This self-locking mechanism makes it possible to always ensure a play-free bearing.

The invention is explained in more detail using the embodiments shown in the drawing.

Fig. 1 shows a section through a plain bearing along the lines I-I of Fig. 2;

Fig. 2 is a side view of the plain bearing according to Fig. 1; Fig. 3 is a section through a piston guide in a cylinder; Fig. 4 is a section along lines IV-IV of Fig. 3 and Fig. 5 shows a detail from Fig. 3 in an enlarged view.

1 and 2 show a plain bearing for a rotary shaft or an axle guide. A shaft or axle 1 is mounted in a three-part bearing shell 2, the parts of which are designated 2a, 2b and 2c. The bearing shell parts 2a, b, c rest in a three-part housing 3, which is provided with three tubular parts 3a, 3b, 3c offset by 120 ^e above the bearing shell parts. In each tubular part 3a, b, c, as can be seen from Fig. 1 for the tubular part 3b, a pin 4 is mounted which is pressed against the bearing shell part 2b by a spring 6 supported on a disk 5. The spring 6 is guided in a tubular piece 7 which is cylindrical on the inside and tapers conically on the outside. Between the conical outer casing of the pipe section 7 and the inner wall of the pipe part 3b there are at least two, preferably four springs 8 which press against balls 9. The balls 9 clamp themselves in the space between

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3 28.07.1987, 1303A

Hinrichsen/Th 9862 G 85 36 163.1

the ring space 13 present between the pipe part 3b and the pipe section 7 and thus prevent the bearing shell part 2b from lifting off the shaft or axis 1. The rotation arrow 10 indicates that the part 1 is a rotating shaft. The double arrow 11 indicates a longitudinal movement axis.

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Cylinder 21, for example for a free piston engine, is shown. The piston 20 is connected, for example, to a crank (not shown). In a Stirling engine, the second piston (working piston) is also a free piston. The details of this plain bearing are explained using Fig. 4 and 5 for better illustration. In the piston 20 there are three holes 23 arranged offset by 120°, in which pins 24 are mounted, to which bearing shell parts 25 inserted between the piston 20 and the cylinder 21 are attached. The pins 24 are provided with a conical extension 24a, which ends in a flat cone 24b. In the center of the piston 20 there are three bushings 26 arranged offset by 120°, in each of which a spiral spring 27 and a ball 28 are inserted. The balls 28 press symmetrically [ on the cones 24b of the pins 24 and thus the bearing shell parts 25 against J the inner wall 21a of the cylinder 21. In the conical annular space 29 ! between the pin extension 24a and the bore 23 there are at least &igr; two, preferably four springs 30 and balls 31 which clamp into the annular space, which in turn serve to self-lock the pins 24 and thus the bearing shell parts 25.

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Claims (9)

28.07.1987, 1303A Hinrichsen/Th 9862 Adjustable plain bearing Meu«s protection claims 1. Plain bearing for rotating or longitudinally guided components with automatically adjustable bearing shell parts, characterized in that the bearing shell parts (2, 25) are acted upon by spring-loaded pins (4, 24). 2. Plain bearing according to claim 1, characterized in that three identical bearing shell parts (2, 25) are present. 3. Plain bearing according to claim 1 and/or 2, characterized in that the pins (4) with the bearing shell parts (2a, 2b, 2c) are arranged around a rotating or longitudinally movable component (1). 4. Plain bearing according to claim 3, characterized in that the pins (4) are arranged in a housing (3) and are pressed against the bearing shell parts (2a, 2b, 2c) by springs (6) arranged axially parallel to them. 5. Plain bearing according to claim ₄ , characterized in that the springs (6) are guided in pipe pieces (7) attached to the pins (4), which leave an annular space between themselves and the inner wall of the housing (3). 6. Plain bearing according to claim 5, characterized in that the pipe sections (7) taper outwards and balls (9) loaded with springs (6) are arranged in the conical annular space (13) created thereby* •t &thetas;« -β -β r· · 2 28.07.1987, 1303&Agr; ; Hinrichsen/Th 9862 ;. G 85 36 163.1 7. Plain bearing according to claim 1 and/or 2, characterized in that the pins (24) are arranged in a piston-like component (20), on the circumference of which the bearing shell parts (25) are guided in a cylinder-like component (21). 8. Plain bearing according to claim 7, characterized in that the pins (24) are provided at their ends with flat cones (24b) ■l are provided, the balls loaded with springs (27) press t?.8). 9. Plain bearing according to claim 8, characterized in that the pins (24) have a conical shoulder (24a) and in the space between the shoulder and the pin bore (23) ^ .. balls ¹³¹ (31) loaded with springs (30) are arranged in the existing conical annular space (29).