Freewheel and auxiliary drive

Abstract

A freewheel for blocking or interrupting a torque transmission of a motor vehicle comprises a first ring configured for the input and/or output of a torque and a second ring that is arranged substantially coaxially to the first ring and configured for the output and/or input of the torque. The freewheel includes a plurality of first blocking elements, movable between a blocking position and a freewheeling position, for blocking the first ring with the second ring in a circumferential direction in the blocking position and for interrupting a torque transmission between the first ring and the second ring in the freewheeling position. A decoupler is coupled to the second ring or to the first ring for damping rotational irregularities. The decoupler has a housing, mounted on the first ring or the second ring via a housing bearing, for providing a restoring torque directed against the rotational irregularity. A brake element, which can act indirectly or directly on the second ring and/or the first ring, is provided for damping the movement of the first ring and/or the second ring. The brake element is connected indirectly or directly to the housing of the decoupler in a rotationally fixed manner.

Claims

1. A freewheel for blocking or interrupting a torque transmission of a motor vehicle, comprising: a first ring configured for an input and/or an output of a torque, a second ring, arranged substantially coaxially to the first ring, configured for the output and/or input of the torque, a plurality of first blocking elements, movable between a blocking position and a freewheeling position, for blocking the first ring with the second ring in a circumferential direction in the blocking position and for interrupting a torque transmission between the first ring and the second ring in the freewheeling position, a decoupler, coupled to the second ring or to the first ring, for damping rotational irregularities, wherein the decoupler has a housing, mounted on the first ring or the second ring via a housing bearing, for providing a restoring torque directed against the rotational irregularity, and a brake element, which can act indirectly or directly on the second ring and/or the first ring, for damping a movement of the first ring and/or the second ring, wherein the brake element is connected indirectly or directly to the housing of the decoupler in a rotationally fixed manner, and wherein the housing of the decoupler is mounted on the first ring, the brake element acts on the second ring and the decoupler is configured for introducing the restoring torque into the second ring, or the housing of the decoupler is mounted on the second ring, the brake element acts on the first ring and the decoupler is configured for introducing the restoring torque into the first ring.

2. The freewheel as claimed in claim 1, wherein the brake element has a centering chamfer for centering the second ring or the first ring on the housing.

3. The freewheel as claimed in claim 1, wherein the first ring is centered on the second ring indirectly via the housing bearing, the housing and the brake element.

4. The freewheel as claimed in claim 1, wherein the first ring and/or the second ring is arranged in an axial direction between the housing bearing and the brake element.

5. The freewheel as claimed in claim 1, wherein a supporting element for limiting an axial offset of the second ring acted upon axially by the brake element or the first ring acted upon axially by the brake element is provided, wherein the second ring and/or the first ring is arranged in the axial direction between the supporting element and the brake element.

6. The freewheel as claimed in claim 1, wherein the brake element is designed to be shiftable between a braking position, in which the brake element acts indirectly or directly on the first ring and/or on the second ring, and a release position, in which the brake element is uncoupled from the first ring and from the second ring.

7. The freewheel as claimed in claim 6, wherein the brake element acts indirectly or directly either on only the second ring or on only the first ring.

8. The freewheel as claimed in claim 1, wherein a shifting element, rotatable in the circumferential direction, for shifting at least one blocking element is provided in a radial direction between the first ring and the second ring.

9. An auxiliary drive for driving auxiliary units of a motor vehicle, comprising a freewheel as claimed in claim 1 for coupling an auxiliary unit to a drive train of the motor vehicle, a generator coupled to the housing of the decoupler, and an auxiliary unit, coupled to the housing of the decoupler and to the generator.

10. The auxiliary drive of claim 9, wherein the generator is a starter generator for starting a motor vehicle engine.

11. The auxiliary drive of claim 9, wherein the auxiliary unit is a climate control compressor.

12. The freewheel of claim 1, wherein the first ring is configured as an inner ring and the second ring is configured as an outer ring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present disclosure is explained by way of example below, with reference to the accompanying drawing, wherein the features illustrated below can represent an aspect of the present disclosure both individually and in combination. The drawing shows:

(2) The single FIGURE illustrating a schematic sectional view of a freewheel.

DETAILED DESCRIPTION

(3) The freewheel 10, illustrated in the FIGURE and configured as a two-way ratchet freewheel, has a first ring 12, configured as an inner ring, and a relatively rotatable second ring 14, arranged coaxially to the inner ring 12 and configured as an outer ring. The inner ring 12 has a plurality of depressions configured as receiving pockets, in which a first blocking element 18, configured as a blocking ratchet, is pivotably inserted in each case so that the first blocking element 18 can be pivoted between the illustrated blocking position, in which the first blocking element 18 engages in the depression of the outer ring 14 during a relative movement in a first circumferential direction, and a freewheeling position, in which the first blocking element 18 is pressed out of the depression of the outer ring 14 against the spring force of a supporting spring during a relative movement in a second circumferential direction contrary to the first circumferential direction. In the radial direction, a shifting element 20, configured as a shifting ring, can engage between the first ring 12 and the second ring 14, which shifting ring can be rotated relative to the first ring 12, on which the first blocking elements 18 are pivotably mounted, in order to pivot the the first blocking elements 18 between the blocking position and the freewheeling position. By mounting the first blocking elements 18 on the first ring 12, the first ring 12 is configured to co-rotate with the first blocking elements 18, whilst the second ring 14 is configured to be rotatable relative to the first blocking elements 18. In the illustrated exemplary embodiment, a second blocking element can be additionally provided, which can be pivoted between a blocking position, in which the second blocking element engages in the depression of the outer ring 14 during a relative rotation in the second circumferential direction, and the freewheeling position, in which the second blocking element is pressed out of the depression of the outer ring 14 against the spring force of the supporting spring during a relative movement in the first circumferential direction.

(4) The freewheel 10 furthermore has a decoupler 26, with the aid of which rotational-speed fluctuations in the torque to be introduced can be damped. To this end, the decoupler 26 has a two-part housing 28 for the input of the torque, a flange-like output element 30, connected to the outer ring 14, for the output of the torque to the outer ring 14 and an energy storage element 32, which can be coupled to the housing 28 and the output element 30 and is configured as a bow spring. The housing 28 can provide in particular a significant inertia to enable rotational-speed fluctuations to be damped or eliminated in a defined frequency range.

(5) The freewheel 10 has a substantially conical brake element 34, which can interact with a friction surface 36 on the second ring 14 and which simultaneously fulfills a centering function for the second ring 14 on the housing 28. To this end, the second ring 14 has a fixedly connected friction plate 38, which can abut with planar contact against the friction surface 36 of the brake element 34 as friction partners. The brake element 34 is connected in a rotationally fixed manner to the housing 28, which is mounted and centered on the inner ring 12 via a housing bearing 40. The brake element 34 can be designed to be movable in the axial direction with the aid of a pre-tensioning spring and/or an actuator 42. An axial relative position of the second ring 14 can be predetermined by a supporting element 44, which is connected to the housing 28 and towards which the second ring 14 can move axially.

LIST OF REFERENCE SIGNS

(6) 10 Freewheel

(7) 12 First ring

(8) 14 Second ring

(9) 18 First blocking element

(10) 20 Shifting element

(11) 26 Decoupler

(12) 28 Housing

(13) 30 Output element

(14) 32 Energy storage element

(15) 34 Brake element

(16) 36 Friction surface

(17) 38 Friction plate

(18) 40 Housing bearing

(19) 42 Actuator

(20) 44 Supporting element