阅读说明：本技术 具有包括第一摩擦装置的离心力摆装置的皮带轮脱耦器 (Pulley decoupler with centrifugal pendulum device comprising a first friction device ) 是由 P·拉施 J·西费特 D·海因里希 H·蒙德 A·斯塔费尔 于 2019-02-14 设计创作，主要内容包括：本发明提供了一种用于辅助驱动的皮带轮脱耦器(1),所述皮带轮脱耦器(1)具有至少：输入部(2)；输出部(3),所述输出部(3)和所述输入部(2)可围绕同一旋转轴线(4)旋转,并且相对于彼此在受限范围内旋转；以及离心力摆装置(5),所述离心力摆装置(5)用于抑制旋转振动,其具有离心力摆法兰(6),可围绕所述旋转轴线(4)旋转,并且具有可在离心力的作用下相对于所述离心力摆法兰(6)位移的至少一个摆质量(7,21),其中由具有第一弹簧(9)和至少一个第一摩擦元件(10)的第一摩擦装置(8)产生的摩擦力作用在所述至少一个摆质量(7,21)上。(The invention relates to a pulley decoupler (1) for an auxiliary drive, wherein the pulley decoupler (1) comprises at least: an input unit (2); an output (3), the output (3) and the input (2) being rotatable about a same axis of rotation (4) and within a limited range relative to each other; and a centrifugal force pendulum device (5), the centrifugal force pendulum device (5) being used for damping rotational vibrations, having a centrifugal force pendulum flange (6), being rotatable about the rotational axis (4), and having at least one pendulum mass (7, 21) that can be displaced relative to the centrifugal force pendulum flange (6) under the effect of centrifugal force, wherein a friction force generated by a first friction device (8) having a first spring (9) and at least one first friction element (10) acts on the at least one pendulum mass (7, 21).)

1. A pulley decoupler (1) for an auxiliary drive, the pulley decoupler (1) having at least:

an input unit (2);

an output (3), the output (3) and the input (2) being rotatable about a same axis of rotation (4) and within a limited range relative to each other; and

a centrifugal pendulum device (5), the centrifugal pendulum device (5) being used to dampen rotational vibrations and having a centrifugal pendulum flange (6), being rotatable about the rotational axis (4), and having at least one pendulum mass (7, 21) that can be displaced relative to the centrifugal pendulum flange (6) by the effect of centrifugal force, wherein a frictional force generated by a first friction device (8) having a first spring (9) and at least one first friction element (10) acts on the at least one pendulum mass (7, 21).

2. The pulley decoupler (1) according to claim 1, wherein the first spring (9) is supported on a cage (11) of a pulley (12) of the output (3).

3. The pulley decoupler (1) according to claim 2, wherein said first friction element (10) is guided into a receptacle (13) within said cover (11) parallel to said axis of rotation (4).

4. Pulley decoupler (1) according to any of the preceding claims, wherein at least one second friction element (14) is arranged between the at least one pendulum mass (7, 21) and the centrifugal force pendulum flange (6).

5. Pulley decoupler (1) according to one of the preceding claims, wherein the centrifugal force pendulum flange (6) is arranged between a spring flange (15) of the input (2) and a hub (16) of the pulley decoupler (1).

6. Pulley decoupler (1) according to any of the preceding claims, wherein the centrifugal force pendulum device (5) is at least partially covered by a first cover (17) fixed to the pulley (12) of the output (3).

7. Pulley decoupler (1) according to any of the preceding claims, wherein the output (3) has a pulley (12) at least partially surrounding the centrifugal force pendulum device (5).

8. Pulley decoupler (1) according to one of the preceding claims, wherein the at least one pendulum mass (7, 21) is arranged in a centrifugal pendulum space (18) of the centrifugal pendulum device (5), wherein the centrifugal pendulum space (18) is at least partially enclosed by a second cover (19).

9. The pulley decoupler (1) according to claim 8, wherein the second cover (19) is connected to a second friction device (20) such that the second cover (19) generates an axial force acting on the pulley decoupler (1).

10. The pulley decoupler (1) as claimed in claim 8, wherein the second cover (19) is designed as a leaf spring, such that the second cover (19) generates an axial force acting on the pulley decoupler (1).

Technical Field

The present invention relates to a pulley decoupler for an auxiliary drive, in particular an internal combustion engine of a motor vehicle, in particular an auxiliary drive traction device drivable by means of the pulley decoupler.

Background

Such a pulley decoupler usually has a damping device comprising at least one spring-loaded energy store, which serves to reduce the rotational vibrations and is arranged between the input and the output of the pulley decoupler. To further reduce the rotational vibrations, the pulley decoupler can also have a centrifugal pendulum device with at least one pendulum mass which can be displaced by the action of the centrifugal force. The at least one pendulum mass oscillates in the opposite direction to the rotational vibration to be eliminated, damping and/or eliminating the vibrational energy or amplitude of the rotational vibration. Due to the oscillation of the at least one pendulum mass, energy can be extracted from the auxiliary drive in a phase-selective manner and supplied again, so that the auxiliary device can be driven by the auxiliary drive in a more uniform manner. During the oscillation, the at least one pendulum mass may strike a stop that limits the maximum oscillation angle of the at least one pendulum mass, thereby generating undesirable noise.

Disclosure of Invention

It is therefore an object of the present invention to at least partially solve the problems described with reference to the prior art, in particular to provide a pulley decoupler that is capable of operating at very low noise levels.

This object is achieved by a pulley decoupler having the features of the independent claim. Further advantageous embodiments of the pulley decoupler are specified in the dependent claims. It is to be noted that the features listed in the respective dependent claims can be combined with each other in any technically suitable manner to define further developments of the invention. Furthermore, the features indicated in the claims are explained and explained in more detail in the description, which lists further preferred embodiments of the invention.

The invention provides a pulley decoupler for an auxiliary drive, having at least the following components:

an input section;

an output portion and an input portion rotatable about the same axis of rotation and within a limited range relative to each other; and

the centrifugal force pendulum device for damping rotational vibrations has a centrifugal force pendulum flange, which is rotatable about an axis of rotation, and has at least one pendulum mass which can be displaced relative to the centrifugal force pendulum flange by the effect of centrifugal force, on which at least one pendulum mass a frictional force generated by a first friction device having a first spring and at least one first friction element can act.

The pulley decoupler can be an accessory drive pulley or an accessory drive driven pulley. Such an auxiliary drive is used in particular for driving a drive machine or at least one auxiliary unit of a motor vehicle. The auxiliary unit may be an auxiliary machine that is not (at least not directly) effective for the movement of the motor vehicle. The pulley decoupler can transmit the torque of the drive machine to the at least one auxiliary unit, in particular via the at least one traction means. To this end, the input of the pulley decoupler can be coupled to the drive machine such that the input can be rotated about the axis of rotation by the drive machine. To this end, the input may comprise a hub connected to the shaft of the drive machine for joint rotation. For example, the shaft may be a crankshaft, a balance shaft, an intermediate shaft, or a camshaft. The input is coupled to the output such that the output is rotatable with the input about an axis of rotation. The output has a traction device running surface for the at least one traction device. The traction means running surface is formed in particular on a circumferential surface of a pulley of the output, so that a rotational movement of the output can be transmitted to the at least one traction means. The term input and output refers to the direction of the torque flow when the belt pulley coupling is a drive wheel which can be driven by a drive machine, for example an internal combustion engine or an electric motor. However, the pulley decoupler can also be a wheel driven by the traction means, which drives the auxiliary unit.

A spring device having at least one energy store is operable between the input and the output such that the output and the input are able to rotate relative to each other within a limited range. The spring device may be supported on the input and output and/or may have at least one compression spring. The spring means may comprise at least one helical spring and/or at least one arcuate spring. The spring means may cause the input and output portions to rotate relative to each other under the force of the spring means. The spring means may dampen and/or eliminate rotational or rotational vibrations.

To further suppress or eliminate rotational or rotational vibrations, the belt pulley decoupler has a centrifugal pendulum device. The centrifugal force pendulum device has a centrifugal force pendulum flange which is rotatable about an axis of rotation and has at least one pendulum mass which is displaceable relative to the centrifugal force pendulum flange under the effect of centrifugal force. Furthermore, the centrifugal force pendulum flange can have at least two pendulum masses. For example, the centrifugal force pendulum flange can have two, three or four pendulum masses. The at least one pendulum mass can be displaced along a predetermined path. Furthermore, the at least one pendulum mass can be displaced between a first end position and a second end position. The centrifugal pendulum device can be used for the speed-adaptive suppression and/or elimination of rotational vibrations or rotational vibrations.

The centrifugal force pendulum device can be arranged on the input or on the output. In this way, the suppression and/or elimination of rotational vibrations or rotational vibrations may be improved in various situations suitable for the application. Furthermore, an installation space optimization suitable for the application can be achieved.

The at least one pendulum mass may be formed from a plurality of parts, and the pendulum mass parts may be arranged on both sides of the centrifugal force pendulum flange. In particular, the pendulum mass parts can be arranged on both sides of the centrifugal force pendulum flange in the direction of the axis of rotation. The at least one pendulum mass can be supported on the centrifugal force pendulum flange by means of a pendulum roller. For this purpose, the centrifugal force pendulum flange can have an opening for receiving the pendulum roller. The at least one pendulum mass may have an opening for receiving the pendulum roller.

A centrifugal pendulum device can be encapsulated. This can protect the centrifugal force pendulum device against contamination, for example. Furthermore, the centrifugal force pendulum device can be laterally and/or radially enclosed on the outside in the form of a housing. In addition, the centrifugal force pendulum device can be surrounded by the input and/or the output. Furthermore, the centrifugal force pendulum device can be surrounded by a housing part. This provides a secure protection against damage caused by defects in the centrifugal force pendulum device. The centrifugal force pendulum device can be arranged radially in the running surface of the traction means. The traction means running surface may be cylindrical and/or may have a larger diameter than the centrifugal force pendulum means. The traction means running surface can have a width at least approximately corresponding to the centrifugal force pendulum device. Furthermore, the running surface of the traction means can be designed in the form of a V-belt running surface. This makes it possible to achieve an extremely compact design.

The friction force generated by the first friction device with the first spring and the at least one first friction element acts on the at least one pendulum mass. A first spring acts directly or indirectly on the at least one first friction element, for example the first spring may be annular and/or in the form of a leaf spring, with a force that brings the at least one first friction element into abutment against the at least one pendulum mass. The at least one first friction element may be annular and/or made at least partially of a plastic such as polyamide or polyoxymethylene. Furthermore, the at least one first friction element may be manufactured by an injection molding process. When the at least one pendulum mass is displaced, a friction force is generated between the at least one pendulum mass and the at least one first friction element, and the at least one pendulum mass is prevented from moving. In this way, the frictional forces prevent the at least one pendulum mass from striking a stop that limits the maximum oscillation angle of the at least one pendulum mass during the operation of the pulley decoupler, so that undesired noise is prevented from being generated.

The first spring may be supported on a cover of the pulley of the output portion.

Furthermore, the first friction element may be guided into a receptacle in the housing parallel to the axis of rotation. To this end, for example, the cover of the pulley has at least one receptacle, for example in the form of an opening, for accommodating the at least one first friction element.

The at least one second friction element may be arranged between the at least one pendulum mass and the centrifugal force pendulum flange. The at least one second friction element may be annular and/or made at least partially of a plastic such as polyamide or polyoxymethylene. Furthermore, the at least one second friction element may be manufactured by an injection molding process.

Furthermore, a centrifugal force pendulum flange can be arranged between the spring flange of the input and the hub of the pulley decoupler. In particular, the centrifugal force pendulum flange is clamped between the spring flange of the input and the hub, and/or the centrifugal force pendulum flange is screwed onto the spring flanges of the input and the hub. Thus, the centrifugal force pendulum flange cannot rotate relative to the spring flange and hub of the input portion. In particular, the spring flange is a component of the spring device. Furthermore, the at least one energy store is supported in particular on the spring flange, so that a torque can be transmitted via the hub, the spring flange and the at least one energy store to the output of the pulley decoupler.

The centrifugal force pendulum device may be at least partially covered by a first cover fixed to a pulley of the output. In particular, the first cover may be pressed into the pulley and/or used as a secure protection.

The output can have a pulley which at least partially surrounds the centrifugal force pendulum device. Thus, the pulley can be used as a secure protection.

The at least one pendulum mass can be arranged in a centrifugal pendulum space of the centrifugal pendulum device, which is at least partially enclosed by the second cover. In particular, the second cover may be pressed into the first cover.

The second cover may be connected to the second friction device such that the second cover generates an axial force acting on the pulley decoupler. The second friction device may have a second spring (e.g. in the form of a leaf spring), a third friction element and/or a fourth friction element. Specifically, the first spring and the second spring cooperate to generate an axial force acting on the pulley decoupler. In particular, the second friction means may be supported on a collar of a circumferential collar parallel to the axis of rotation.

The second cover can be designed as a leaf spring, so that the second cover generates an axial force acting on the pulley decoupler.

Drawings

The invention and the technical environment will be explained in more detail below with reference to the drawings. It should be noted that the following drawings show specific preferred variants of the invention, but the invention is not limited thereto. Similar components are identified in the drawings by the same reference numerals. The figures show schematically and schematically:

FIG. 1: a first variation of a pulley decoupler; and

FIG. 2: a second variation of the pulley decoupler.

Description of the reference numerals

1 pulley decoupler 2 input 3 output 4 centrifugal force pendulum device 6 centrifugal force pendulum flange 7 first pendulum mass 8 first friction device 9 first spring 10 first friction element 11 cover 12 pulley 13 container 14 second friction element 15 spring flange 16 hub 17 first cover 18 centrifugal force pendulum space 19 second cover 20 second friction device 21 second pendulum mass 22 traction device surface 23 circumferential surface 24 third friction element 25 fourth friction element 26 second spring 27 pendulum roller 28 damping device 29 collar 30 accumulator.

Detailed Description

Fig. 1 shows a longitudinal section of a first variant of a pulley decoupler 1. The pulley decoupler 1 has an input 2 with a hub 16, a centrifugal force pendulum flange 6, a centrifugal force pendulum device 5 and a spring flange 15. The hub 16, the centrifugal force pendulum flange 6 and the flange 15 are arranged for joint rotation, rotatable about the axis of rotation 4 under the drive of an electric vehicle drive machine (not shown). The pulley decoupler 1 also has an output 3 comprising a pulley 12. An outer circumferential surface 23 of the pulley 12 forms a traction device running surface 22 for a traction device (not shown). Between the input 2 and the output 3, a damping device 28 is provided, which comprises a plurality of energy stores 30 arranged in the circumferential direction, which energy stores 30 are designed here in the form of arcuate springs. The energy accumulator 30 is supported on the one hand on the spring flange 15 and on the other hand on the belt pulley 12 or on the housing 11 of the belt pulley 12, so that the input 2 and the output 3 can be rotated relative to one another to a limited extent under the influence of the spring force of the energy accumulator 30. The cover 11 is pressed into the pulley 12 so that it cannot rotate relative to the pulley 12.

Furthermore, the cover 11 has a receptacle 13 in a radial section, into which receptacle 13 the first friction element 10 of the first friction device 8 is guided parallel to the axis of rotation 4. The first friction device 8 also comprises a first spring 9, which first spring 9 is designed here in the form of an annular leaf spring. The first spring 9 is supported on a radial section of the housing 11 and is pressed into the first friction element 10 in the axial direction, i.e. parallel to the axis of rotation 4, and bears against the first pendulum mass 7 which can be displaced under the effect of the centrifugal force relative to the centrifugal force pendulum flange 6. The second friction element 14 is arranged between the first pendulum mass 7 and the centrifugal force pendulum flange 6. When the first pendulum mass 7 is displaced, the first friction device 8 generates a friction force, by means of which the movement of the first pendulum mass 7 is prevented. Furthermore, the second pendulum mass 21 can be displaced by the action of the centrifugal force relative to the centrifugal force pendulum flange 6, which is arranged on the opposite side of the centrifugal force pendulum flange 6. The first pendulum mass 7, the second friction element 14 and the second pendulum mass 21 are held in the centrifugal pendulum space 18 by pendulum rollers 27 on the centrifugal pendulum flange 6. The centrifugal force pendulum space 18 is partially limited by a first cover 17 pressed into the first belt pulley 12 and a second cover 19 pressed into the first cover 17. The axial force from the second friction means 20 acts on the second cover 19. For this purpose, the second friction device 20 has a second spring 26, which second spring 26 is designed here in the form of an annular leaf spring, which is supported on the one hand on the third friction element 24 held in the axial direction by a circumferential collar 29 of the hub 16 and on the other hand on the fourth friction element 25 of the second cover 19.

Fig. 2 shows a second variant of the pulley decoupler 1 in longitudinal section, the only difference between the first variant of the pulley decoupler 1 shown in fig. 1 being that the second cover 19 pressed into the first cover 17 itself acts as a leaf spring and, after mounting, by pressing the third friction element 24 of the hub 16, an axial force acting on the pulley decoupler 1 is generated directly.

With the invention, the pulley decoupler can operate at very low noise levels.