阅读说明：本技术 皮带轮脱耦器 (Belt pulley decoupler ) 是由 约瑟夫·伊斯勒 弗里茨·科恩迈尔 于 2020-10-21 设计创作，主要内容包括：一种皮带轮脱耦器(1),其具有输入侧(2)和输出侧(3)和共同的旋转轴线(4)以及在输入侧(2)与输出侧(3)之间作用的至少一个弹簧元件(5),抵抗所述至少一个弹簧元件的弹簧作用,输入侧(2)和输出侧(3)可以在环周方向(6)上相对于彼此扭转,其中输出侧(3)经由在输入侧(2)处设置的轴承(7)相对于输入侧(2)可旋转地支承,其中输出侧(3)从轴承(7)开始在至少一个弹簧元件(5)的第一侧(8)上在径向方向(9)上向外延伸至皮带部段(10),其中从皮带部段(10)开始且沿着径向方向(9)向内在与第一侧(8)相对置的第二侧(11)上延伸有盖(14)。(A pulley decoupler (1) having an input side (2) and an output side (3) and a common axis of rotation (4) and at least one spring element (5) acting between the input side (2) and the output side (3), against the spring action of which the input side (2) and the output side (3) can be twisted relative to one another in a circumferential direction (6), wherein the output side (3) is rotatably supported relative to the input side (2) via a bearing (7) arranged at the input side (2), wherein the output side (3) extends from the bearing (7) on a first side (8) of the at least one spring element (5) in a radial direction (9) outward to a belt section (10), wherein a cover (14) extends from the belt section (10) and in the radial direction (9) inwardly on a second side (11) opposite the first side (8).)

1. A pulley decoupler (1) having an input side (2) and an output side (3) and a common axis of rotation (4) and at least one first spring element (5) acting between the input side (2) and the output side (3), against the spring action of which the input side (2) and the output side (3) can be twisted relative to one another in a circumferential direction (6), wherein the output side (3) is rotatably supported relative to the input side (2) via a bearing (7) provided at the input side (2), wherein the output side (3) extends from the bearing (7) on a first side (8) of the at least one first spring element (5) in a radial direction (9) outward to a belt section (10), wherein starting from the belt section (10) and extending in the radial direction (9) inward along the axis of rotation (4), and wherein the output side (3) is rotatable relative to the input side (2), wherein the belt section (10) is rotatable relative to the belt section (10) by means of the bearing (7) and wherein the first spring element extends in the radial direction ( A cover (14) extends on a second side (11) opposite the first side (8) in the axial direction (13), wherein a second spring element (12) is arranged on the first side (8) between the input side (2) and the output side (3) and generates a spring force acting in the axial direction (13) between the input side (2) and the output side (3).

2. The pulley decoupler (1) according to claim 1, wherein the second spring element (12) is a belleville spring.

3. Pulley decoupler (1) according to any of the preceding claims, wherein the cover (14) is supported at the input side (2) via a first friction ring (15).

4. The pulley decoupler (1) according to claim 3, wherein the first friction ring (15) is attached at the cover (14), wherein the first friction ring (15) is twistable with the cover (14) and the output side (3) relative to the input side (2) along the circumferential direction (6).

5. A pulley decoupler (1) according to any one of the preceding claims 3 and 4, wherein the bearing (7) is arranged on a first diameter (16) and the first friction ring (15) forms a sealing surface together with the input side (2) on a second diameter (17), wherein the second diameter (17) is smaller than or equal to the first diameter (16) or at most fifteen percent larger than the first diameter.

6. Pulley decoupler (1) according to any of the preceding claims, wherein a second friction ring (18) is provided on the first side (8) between the input side (2) and the output side (3).

7. The pulley decoupler (1) according to claim 6, wherein the second friction ring (18) is arranged between the output side (3) and the second spring element (12) along the axial direction (13).

8. The pulley decoupler (1) according to claim 7, wherein the second spring element (12) is arranged in a space (19) which is separated from the environment (20) by the second friction ring (18) and the input side (2).

9. Pulley decoupler (1) according to any of the preceding claims, wherein between the input side (2) and the output side (3) only a first friction ring (15) is provided on the second side (11) and only a second friction ring (18) is provided on the first side (8).

10. Pulley decoupler (1) according to any of the preceding claims, wherein the at least one first spring element (5) is arranged in a volume (21) formed at least by the output side (3) and the cover (14), wherein the volume (21) is at least partially filled with a fluid (22) and is sealed on the second side (11) by the cover (14) with respect to the environment (20) of the pulley decoupler (1).

Technical Field

The invention relates to a pulley decoupler having an input side and an output side and a common axis of rotation and at least one spring element acting between the input side and the output side, against the spring force of which the input side and the output side can be twisted relative to one another in the circumferential direction. In particular, the pulley decoupler comprises at least one damping device (torsional damper — TSD) in addition to the at least one spring element.

Background

The pulley decoupler is particularly designed for attaching the pulley at the crankshaft of a drive machine, for example a motor vehicle. The transmission of torsional vibrations, for example of the drive mechanism, to the belt driven by the belt pulley should therefore at least be reduced or avoided. However, the pulley decoupler can also constitute a dual mass flywheel.

Such a pulley decoupler or drive wheel is known from DE 102017111664.8 and DE 102017113043.8 and DE 102013206444 a1, respectively, wherein the gap/volume (e.g. at least partially filled with lubricant) is sealed off from the outside environment (here the spring receiving space) on the one hand and the drive wheel is positioned in the axial direction on the other hand via a sealing and positioning device. For this purpose, spring elements (disk springs) are provided between the traction means attachment region (output side) and the shaft attachment region (input side), said spring elements tensioning the regions in the axial direction against one another. The spring element is held here by a friction ring (without an elastic sealing lip), which likewise ensures the sealing effect.

The sealing requirements for the gap are very high. Therefore, due to higher requirements, various contamination tests are performed, such as a splash test, a mud salt water test, a dust test, a salt spray test, a wading test.

There is a continuing need to simplify components for motor vehicles, such as pulley decouplers, and to reduce manufacturing costs.

Disclosure of Invention

In this respect, the object of the invention is to provide a pulley decoupler of as simple a construction as possible, in particular comprising as few components as possible.

The object is achieved by means of a pulley decoupler. Further advantageous embodiments of the invention are described in the text. The features listed individually in this text can be combined with one another in a technically meaningful manner and can define further embodiments of the invention. Furthermore, the features of the invention are explained and illustrated in detail in the description, in which further preferred embodiments of the invention are shown.

A pulley decoupler is proposed, which has an input side and an output side and a common axis of rotation and at least one first spring element acting between the input side and the output side, against the spring action of which the input side and the output side can be twisted relative to one another in the circumferential direction. The output side is rotatably supported relative to the input side via a (plain) bearing provided at the input side. The output side extends from the (sliding) bearing on the first side of the at least one first spring element outward in the radial direction to a belt section (at which a belt can be provided, which can be driven via the belt section or via a pulley decoupler). A cover extends from the belt section and radially inward on a second side opposite the first side in an axial direction extending along the axis of rotation. A second spring element is arranged on the second side between the input side and the output side, which second spring element generates a spring force acting in the axial direction between the input side and the output side.

The input side (also referred to as shaft attachment region, since the input side can be connected or connected to the shaft in a rotationally fixed manner, for example, to the crankshaft) can be rotated, in particular against the spring force of at least one spring element and, in particular, against the damping action of at least one torsional vibration damper device, relative to the output region (also referred to as belt attachment region, since the output side can be connected or connected to the belt in a rotationally fixed manner via a belt section), by an angular range extending in the circumferential direction at most (for example, by an angle of at most 30 degrees). The torsion is limited, for example, by a stop (for example, formed on the one hand by the input side and on the other hand by the cover or the output side). The stop on the output side is formed in particular at least by a corner element attached (for example by riveting or welding or the like) at the output side.

The torque is transmitted via the output side to the belt connected to the belt section, in particular via at least one first spring element and stops at the input side and the output side.

Torsional vibrations can at least be reduced via a relative rotation of the input side relative to the output side, which takes place counter to the spring force and, if appropriate, the damping effect.

The second spring element is in particular formed annularly and circumferentially.

The second spring element is in particular a disk spring.

The cover is supported at the input side, in particular, via a first friction ring. The first friction ring is in particular formed annularly and circumferentially around the ring.

The cover is connected in a rotationally fixed manner to the output side, in particular by means of an interference fit.

The first friction ring is in particular attached to the cover, wherein the first friction ring can be twisted together with the cover and the output side relative to the input side in the circumferential direction.

Alternatively, a first friction ring is attached at the input side, wherein the first friction ring can be twisted together with the input side in the circumferential direction relative to the cover and the output side.

The cover can in particular be extended further in the radial direction towards the axis of rotation by a movement of the second spring element away from the cover and towards the first side. Thereby, in particular only the (first) friction ring is also required between the cover and the input side.

The (sliding) bearing is in particular arranged on a (largest) first diameter, and the first friction ring together with the input side forms the sealing surface on a (largest) second diameter, wherein the (largest) second diameter is smaller than or equal to the (largest) first diameter or is at most fifteen percent, in particular at most five percent, preferably at most two percent larger than the (largest) first diameter. The sealing surface is preferably arranged on the smallest possible diameter in order to achieve the best possible sealing effect.

The first diameter extends in particular in the radial direction via the axis of rotation to the inner ring circumference on the output side, which is in contact with the (sliding) bearing. The second diameter extends in particular in the radial direction via the axis of rotation up to the maximum diameter of the sealing surface between the first friction ring and the input side or between the first friction ring and the output side or the cover.

In particular, a second friction ring is arranged on the first side between the input side and the output side. The second friction ring enables a low-friction relative rotation between the input side and the output side on the first side. The second friction ring is in particular formed annularly and circumferentially around it. The second friction ring extends in particular at least in the radial direction. The second friction ring is arranged in particular in the axial direction between the output side and the input side.

The second friction ring is arranged in particular in the axial direction between the output side and the second spring element. The second spring element contacts the second friction ring on the one hand and the input side on the other hand.

The second spring element is arranged in particular in a space which is separated from the environment (of the pulley decoupler) by the second friction ring and the input side. In particular, corrosion can be reduced, since the second spring element is arranged in a protected manner with respect to environmental influences.

In particular, between the input side and the output side, only the first friction ring is arranged on the second side and only the second friction ring is arranged on the first side.

The cover forms a sealing surface, in particular together with the belt section, which seals the volume from the environment.

The at least one first spring element is arranged in particular in a volume which is formed at least by the output side (on the first side) and the cover (on the second side), wherein the volume is at least partially filled with a fluid (lubricant, for example grease) and is sealed off on the second side by the cover and the first friction ring from the environment of the pulley decoupler.

The cover is supported at the input side or at a torsional vibration damper (TSD) via a first friction ring.

In particular, buckling of the at least one first spring element can be prevented via the cover. The cover, which is in particular of rigid design, itself absorbs the forces acting in the axial direction.

In particular, a number of advantages result from the embodiment of the belt pulley decoupler. On the one hand, the filling of a volume with fluid, in which at least one spring element is arranged, can be improved by a cover which extends further inwards in the radial direction. Furthermore, the sealing of the volume during operation of the pulley decoupler is improved, since fewer sealing surfaces are present (only the first friction ring is also required for sealing the volume). Furthermore, the sealing surface is arranged on a small second diameter, so that the sealing surface is of relatively small design, so that the sealing properties can be further improved. Furthermore, the complexity of the pulley decoupler is now smaller compared to known designs, since only the first friction ring on the second side is also required.

It is to be noted in advance that the terms "first", "second" … … are used here preferably (merely) to distinguish a plurality of similar objects, sizes or processes, i.e. the relevance and/or order of the objects, sizes or processes to one another is not mandatory in particular. If dependency and/or order is required, this is explicitly stated herein or will be apparent to one of ordinary skill in the art upon study of the specifically described embodiments. As long as a component can be present multiple times ("at least one"), the description of one of the components can equally be applied to all or part of a plurality of the components, but this is not mandatory.

Drawings

The present invention and the technical field are explained in detail below with reference to the accompanying drawings. It is to be noted that the present invention should not be limited by the listed examples. In particular, if not explicitly stated otherwise, some aspects of the facts stated in the figures may also be extracted and combined with other constituents and knowledge of the present description. It is to be noted in particular that the figures and the dimensional relationships shown in particular are merely schematic. The figures show:

fig. 1 shows a cross section of a first embodiment variant of a known pulley decoupler in a side view;

fig. 2 shows a cross section of a second embodiment variant of the known pulley decoupler in a side view; and

fig. 3 shows a section of the pulley decoupler in a side view.

Detailed Description

Fig. 1 shows a cross section of a first embodiment variant of a known pulley decoupler 1 in a side view. The pulley decoupler 1 comprises an input side 2 and an output side 3 and a common axis of rotation 4, and at least one first spring element 5 which acts between the input side 2 and the output side 3 and by means of which the input side 2 and the output side 3 can be twisted relative to one another in a circumferential direction 6. The output side 3 is rotatably supported relative to the input side 2 via a (plain) bearing 7 provided at the input side 2. The output side 3 extends from the (sliding) bearing 7 on a first side 8 of the at least one first spring element 5 in a radial direction 9 outward to a belt section 10 (at which a belt can be provided, which can be driven via the belt section 10 or via the pulley decoupler 1). Starting from the belt portion 10 and extending in the radial direction 9 inward on a second side 11 opposite the first side 8, a cover 14 extends. The cover 14 is connected via a first friction ring 15 to a disk spring 23, by means of which the output side 3 and the input side 2 are arranged in a tensioned manner relative to one another relative to the axial direction 13. The disk spring 23 is arranged clamped by two elements of the input side 2 (on the one hand by a stop of the input side 2 for forming part of the first spring element 5 and on the other hand by a torsional vibration damper 24). The cover 14 and the output side 3 together form a volume 21 in which the spring element 5 is arranged. The volume 21 is at least partially filled with a fluid 22. On the first side 8, the volume 21 is sealed by a second friction ring 18, which bridges the gap between the input side 2 and the output side 3.

The (sliding) bearing 7 is arranged on a (largest) first diameter 16, and the first friction ring 15 (on the second side 11) together with the cover 14 or the disk spring 23 forms a sealing surface on a (largest) second diameter 17, wherein the (largest) second diameter 17 is significantly larger than the (largest) first diameter 16.

Fig. 2 shows a cross section of a second embodiment variant of the known pulley decoupler 1 in a side view. Reference is made to the embodiment relating to figure 1.

In contrast to the first embodiment variant, in the second embodiment variant two friction rings 15, 25 (first friction ring 15 and third friction ring 25) are provided on the second side 11 of the first spring element 5. The disk spring 23 is arranged between the friction rings 15, 25. A first friction ring 15 is provided at the cover 14. A third friction ring 25 is arranged between the disk spring 23 and the torsional vibration damper 24.

The two friction rings 15, 25 (on the second side 11) form sealing surfaces at the respective second diameter 17, together with the cover 14 or the disk spring 23 on the one hand and the torsional vibration damper 24 on the other hand. The largest second diameter 17 is here significantly larger than the largest first diameter 16.

Fig. 3 shows a section of the pulley decoupler 1 in a side view. The pulley decoupler 1 comprises an input side 2 and an output side 3 and a common axis of rotation 4 and at least one first spring element 5 which acts between the input side 2 and the output side 3 and against whose spring action the input side 2 and the output side 3 can be twisted relative to one another in a circumferential direction 6. The output side 3 is rotatably supported relative to the input side 2 via a (plain) bearing 7 provided at the input side 2. The output side 3 extends from a (sliding) bearing 7 on a first side 8 of the at least one spring element 5 in a radial direction 9 to a belt section 10 (at which a belt can be provided, which can be driven via the belt section 10 or via the pulley decoupler 1). Starting from the belt portion 10 and extending in the radial direction 9 inward on a second side 11 opposite the first side 8, a cover 14 extends. A second spring element 12 is arranged on the first side 8 between the input side 2 and the output side 3, which second spring element generates a spring force acting in the axial direction 13 between the input side 2 and the output side 3.

The second spring element 12 is formed annularly and circumferentially in the circumferential direction 6. The second spring element 12 is a belleville spring.

The cover 14 is supported at the input side 2 via a first friction ring 15. The first friction ring 15 is formed annularly and circumferentially in the circumferential direction 6.

A first friction ring 15 is attached to the cover 14, wherein the first friction ring 15 can be twisted together with the cover 14 and the output side 3 relative to the input side 2 in the circumferential direction 6.

By eliminating the second spring element 12 on the second side 11 of the first spring element 5, the cover 14 can extend further in the radial direction 9 towards the axis of rotation 4. Thereby, at the second side 11, only the first friction ring 15 is also needed between the cover 14 and the input side 2.

The (sliding) bearing 7 is arranged on a maximum first diameter 16, and the first friction ring 16 together with the input side 2 or the torsional vibration damper 24 forms a sealing surface on a maximum second diameter 17, wherein the maximum second diameter 17 is approximately 110% of the first diameter 16.

A second friction ring 18 is arranged on the first side 8 between the input side 2 and the output side 3. The second friction ring 18 enables a low-friction relative rotation between the input side 2 and the output side 3 on the first side 8. The second friction ring 18 is formed annularly and circumferentially in the circumferential direction 6. The second friction ring 18 extends at least in the radial direction 9. A second friction ring 18 is arranged between the output side 3 and the input side 2 along the axial direction 13.

A second friction ring 18 is arranged in the axial direction 13 between the output side 3 and the second spring element 12. The second spring element 12 contacts the second friction ring 18 on the one hand and the input side 2 on the other hand.

The second spring element 12 is arranged in a space 19 which is separated from an environment 20 of the pulley decoupler 1 by the second friction ring 18 and the input side 2.

Between the input side 2 and the output side 3, only the first friction ring 15 is arranged on the second side 11 and only the second friction ring 18 is arranged on the first side 8.

The cover 14 forms a sealing surface together with the belt section 10, which seals the volume 21 from the environment 20.

The first spring element 5 is arranged in a volume 21 formed by the output side 3 (on the first side 8) and the cover 14 (on the second side 11), wherein the volume 21 is at least partially filled with a fluid 22 (lubricant, for example grease) and is sealed on the second side 11 by the cover 14 and the first friction ring 15 with respect to the environment 20 of the pulley decoupler 1.

The cover 14 is supported via a first friction ring 15 at the input side 2 or at a torsional vibration damper (TSD) 24.

List of reference numerals

1 Belt pulley decoupler

2 input side

3 output side

4 axis of rotation

5 first spring element

6 direction of circumference

7 bearing

8 first side

9 radial direction

10 belt section

11 second side

12 second spring element

13 axial direction

14 cover

15 first friction ring

16 first diameter

17 second diameter

18 second friction ring

19 space (a)

20 environment

21 volume

22 fluid

23 disc spring

24 torsional vibration damper

25 third friction ring