DE102019128700A1 - Overrunning clutch - Google Patents

Abstract

One-way clutch with an inner race (16), an outer race (18) coaxially surrounding the inner race so that an annular gap (20) is formed between the races, and a set of housed in the annular gap (20) Clamping elements (22), one of the races (18) forming a clamping contour (26) delimiting the annular gap (20) for the clamping elements (22), characterized in that the race (18) which forms the clamping contour (26) has an axial has a cylindrical peripheral wall section (32) adjoining the clamping contour, which is formed in one piece with the section forming the clamping contour and which, with a corresponding peripheral wall section (34) of the other race (16), has an annular space (36) which axially extends the annular gap (20) forms, and that in this annular space (36) is integrated into the one-way clutch axial bearing (38).

Description

The invention relates to a one-way clutch with an inner race, an outer race which coaxially surrounds the inner race so that an annular gap is formed between the races, and with a set of clamping elements received in the annular gap, one of the races one Forming annular gap limiting clamping contour for the clamping elements.

One-way clutches of this type are known in a wide variety of embodiments and are used, for example, to mechanically couple two alternative drive sources, for example the motor shaft of an internal combustion engine and an electric motor, to the same consumer and to thereby avoid repercussions of the faster-running drive source on the slower-running drive source. The one-way clutch can also perform the function of a bearing sleeve with which a shaft which is connected to at least one of the driving and driven elements is mounted coaxially in a hollow shaft which is connected to another of the driving and driven elements. The outer race is then rotatably inserted into the hollow shaft, while the inner race sits rotationally on the shaft mounted therein.

In an alternative design of one-way clutches, neither the inner race nor the outer race has a clamping contour, and instead, clamping bodies are pivotally held in the annular gap in such a way that, depending on the direction of action of the torque, they reach a clamping position or a position that releases the clamping. However, one-way clutches of the type considered here have the advantage that they can be manufactured and assembled more easily. For example, the outer race can be formed by a deep-drawn sleeve, in which the clamping contour is simultaneously formed in the deep-drawing process.

In some applications, it is desirable that the two rotatable elements that are coupled together by the one-way clutch are also held in a fixed axial position relative to one another. For this purpose, an axial bearing, which is manufactured separately from the one-way clutch and is axially offset from it, has mostly been used.

The object of the invention is to provide a one-way clutch with which a particularly small-sized bearing arrangement can be realized.

This object is achieved according to the invention in that the race that forms the clamping contour has a cylindrical circumferential section axially adjoining the clamping contour, which is formed in one piece with the section that forms the clamping contour and that forms an annular gap with a corresponding circumferential wall section of the other race forms axially extending annular space, and that an axial bearing integrated in the one-way clutch is accommodated in this annular space.

According to the invention, the axial bearing is thus structurally integrated into the one-way clutch, so that an additional axial bearing can be dispensed with. The outer ring of the thrust bearing can be inserted into the outer race of the one-way clutch or be formed in one piece with it. In both cases, high radial forces can be absorbed despite the small dimensioning of the axial bearing. Accordingly, the inner ring of the thrust bearing can also be pushed onto the inner race of the one-way clutch or can be formed in one piece with it. Since the annular gap of the one-way clutch provided with the clamping contour and the annular space for the axial bearing directly adjoin one another and are connected to one another, reliable lubrication and sealing of both components is facilitated.

Advantageous refinements and developments are specified in the subclaims.

In an advantageous embodiment, the race, which forms the clamping contour, is a deep-drawn part. The clamping contour and the axially adjoining cylindrical peripheral wall section can then be produced simply and efficiently in the same deep-drawing process.

Exemplary embodiments are explained in more detail below with reference to the drawing.

• 1 einen axialen Schnitt durch eine Freilaufkupplung, die zugleich zur Lagerung einer inneren Welle in einer Hohlwelle dient;
• 2 einen Schnitt längs der Linie II - II in 1;
• 3 einen Schnitt längs der Linie III - III in 1; und
• 4 einen axialen Schnitt durch eine Freilaufkupplung gemäß einem abgewandelten Ausführungsbeispiel.

Show it:

• 1 an axial section through a one-way clutch, which also serves to support an inner shaft in a hollow shaft;
• 2nd a cut along the line II - II in 1 ;
• 3rd a cut along the line III - III in 1 ; and
• 4th an axial section through a one-way clutch according to a modified embodiment.

In 1 is a sleeve-shaped one-way clutch 10th shown that a hollow shaft 12 with an inner shaft mounted in this hollow shaft 14 couples. As an example, it can be assumed that the inner wave 14 drives a consumer and in turn is driven by an internal combustion engine while the hollow shaft 12 can be driven by an electric motor. In operating phases in which the internal combustion engine is not in operation, the consumer can then use the hollow shaft 12 and the one-way clutch 10th are driven. If on the contrary the wave 14 driven by the internal combustion engine at a speed that is the speed of the hollow shaft 12 exceeds, the one-way clutch ensures decoupling so that the electric motor does not switch to generator operation.

The one-way clutch 10th has an inner race 16 and an outer race 18th on the inner race 16 surrounds by far. In this way there is an annular gap between the two races 20th formed of a set of clamping elements, in this example pinch rollers 22 , as well as a cage holding these pinch rollers 24th records. The outer peripheral surface of the inner race 16 forms a cylindrical running surface for the pinch rollers 22 . The inner peripheral surface of the outer race 18th is not cylindrical, however, but forms a clamping contour 26 for the pinch rollers, as in the sectional view in 2nd can be seen. In this example, the clamping contour forms 26 for every pinch roller 22 a pocket 28 , in which the width of the clamping gap 20th is so enlarged that it is larger than the diameter of the pinch rollers. Each pocket closes clockwise 28 a ramp 30th along, along which the width of the annular gap decreases to a value which is smaller than the diameter of the pinch rollers.

If the hollow shaft 12 relative to the inner wave 14 counterclockwise in 2nd turns, the pinch rollers run 22 on the ramps 30th on and go into clamping so that the torque from the hollow shaft 12 on the inner wave 14 is transmitted. In contrast, the inner shaft turns 14 counterclockwise at a higher speed than the hollow shaft 12 , the pinch rollers step into the pockets 28 one so that the clamp is released and the inner shaft 14 can rotate freely without applying torque to the hollow shaft 12 is transmitted.

As in 1 and 3rd can be seen, the outer race 18th at his in 1 right end a cylindrical peripheral wall portion formed in one piece with the rest of this race 32 on the axially to the clamping contour 26 connects. The inner race too 16 has a peripheral wall section in this area 34 on that with the peripheral wall portion 32 an annulus 36 forms. In this annulus 36 that the annular gap 20th axially extended, is a thrust bearing 38 added, which is designed in the example shown as a deep groove ball bearing and balls 40 has as rolling elements. The balls 40 are in a cage 42 held. An inner ring of the deep groove ball bearing is directly through the peripheral wall portion 34 formed in which a groove for the balls is formed. An outer ring 44 the deep groove ball bearing is suitable and non-rotatable in the cylindrical peripheral wall section 32 the outer race 18th used. On both sides of the balls 40 and the cage 42 is the axial roller bearing with clipped end rings 46 completed.

In the example shown, the outer race 18th including the cylindrical peripheral wall portion 32 formed by a deep-drawn sleeve, which on the in 1 left end by an inwardly bent waistband 48 is completed. At the opposite end is the race 18th open. The peripheral wall section 32 there forms a cylindrical inner surface on which the outer ring 44 of the thrust bearing 38 is held in the press fit or by gluing. The pinch rollers 22 , the cage 24th as well as the cage 42 with the balls 40 and the outer ring 44 of the thrust bearing 38 can from the open, in 1 right end into the sleeve-shaped outer race 18th be introduced.

4th shows a one-way clutch according to a modified embodiment. The main difference compared to the one-way clutch described above is that the thrust bearing 38 an inner ring 50 which is separate from the inner race 16 is trained. In this embodiment, the complete thrust bearing 38 pre-assembled and then as a unit in the annulus 36 be pushed in or pressed in.

Claims (7)

One-way clutch with an inner race (16), an outer race (18) coaxially surrounding the inner race so that an annular gap (20) is formed between the races, and a set of housed in the annular gap (20) Clamping elements (22), one of the races (18) forming a clamping contour (26) delimiting the annular gap (20) for the clamping elements (22), characterized in that the race (18) which forms the clamping contour (26) has an axial has a cylindrical peripheral wall section (32) adjoining the clamping contour, which is formed in one piece with the section forming the clamping contour and which, with a corresponding peripheral wall section (34) of the other race (16), has an annular space (36) which axially extends the annular gap (20) forms, and that in this annular space (36) is integrated into the one-way clutch axial bearing (38). Overrunning clutch after Claim 1 , in which the axial bearing (38) is an axial roller bearing. Overrunning clutch according to one of the preceding claims, in which the axial bearing (38) is a deep groove ball bearing. Overrunning clutch after Claim 2 or 3rd , in which the axial bearing (38) has an outer ring (44) and / or an inner ring (50) which is formed separately from the outer race (18) or the inner race (16). Overrunning clutch according to one of the preceding claims, in which the clamping elements (22) are clamping rollers. Overrunning clutch according to one of the preceding claims, in which the race (18) which forms the clamping contour (26) is a deep-drawn part, in which the clamping contour (26) and the cylindrical peripheral wall section (32) have been produced in a common deep-drawing process. Overrunning clutch according to one of the preceding claims, in which the clamping contour (36) is formed on the outer race (18).

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