DE102015205514A1 - Centrifugal pendulum and use of a permanent magnet - Google Patents

Abstract

It is a centrifugal pendulum (10) for damping rotational irregularities introduced via a drive shaft of a motor vehicle engine provided with a connectable to the drive shaft carrier flange (12), at least one relative to the support flange (12) pendulum pendulum mass (14) for generating a rotation non-uniformity Restoring moments and at least one in a raceway (15) of the Trägerflanschs (12) and a pendulum track (16) of the pendulum mass (14) guided roller (18) for guiding the pendulum mass (14) relative to the support flange (12), wherein the roller (18 ) has a magnetic field interacting with the track (15) and / or the pendulum track (16).

Description

The invention relates to a centrifugal pendulum for damping rotational irregularities introduced via a drive shaft of a motor vehicle engine, and to the use of a permanent magnet in such a centrifugal pendulum, by means of which a restoring torque directed counter to rotational nonuniformity can be generated.

For example DE 10 2008 059 297 A1 a centrifugal pendulum pendulum is known in which a guided over in corresponding raceways rollers relative to a support flange displaceable pendulum mass is provided, which can generate at a speed fluctuation of the rotational speed fluctuation directed opposite restoring torque for damping the speed fluctuation. The support flange has two interconnected via spacer bolts flange parts between which the pendulum mass can oscillate. The pendulum mass has at its pointing in the tangential direction end sides in each case a buffer element made of an elastic rubber material which can strike upon reaching a maximum oscillation angle of the pendulum mass to the respectively assigned spacer bolt of the support flange.

There is a constant need to reduce noise emissions in a drive train of a motor vehicle.

It is the object of the invention to show measures that allow a low-noise drive train of a motor vehicle.

The object is achieved by a centrifugal pendulum with the features of claim 1 and a use with the features of claim 4. Preferred embodiments of the invention are set forth in the dependent claims and the description below, each individually or in combination constitute an aspect of the invention can.

According to the invention, a centrifugal pendulum for damping rotational irregularities introduced via a drive shaft of a motor vehicle engine is provided with a support flange which can be connected to the drive shaft, at least one pendulum mass pendulumable relative to the support flange for producing a restoring moment counteracting rotational nonuniformity and at least one in a raceway of the support flange and a pendulum track the pendulum mass guided roller for guiding the pendulum mass relative to the support flange, wherein the roller has a cooperating with the track and / or the pendulum track magnetic field.

If the pendulum mass strikes in the tangential direction, in particular via an end-side rubber stop pointing in the tangential direction at a maximum possible oscillation angle on the support flange or another component, the rollers still have some air in the raceway of the support flange and in the pendulum track of the pendulum mass. The rollers can be further driven due to their own impulse until they hit the respective tail and thereby produce metallic impact noises. It is quite possible that the roller is thrown back and forth several times along the track and / or the pendulum track until the impulse of the roller is used up. By the magnetic field of the roller, however, it is possible that the roller in the raceway and / or in the pendulum track, preferably at its respective end in the circumferential direction, adhere magnetically and is not thrown back by their own impulse after a (partial) elastic shock , The roller can no longer fly freely between the support flange and the pendulum mass back and forth. That is, the roller rolls along the tracks until it sticks to the tail. Thus, a multiple back and forth beat is prevented. Due to the magnetic field of the roller can at a tangential striking the pendulum a noisy back and forth beat the roller can be avoided by the roller magnetically adhere to a tail of the track and / or the pendulum track, so that a low-noise drive train of a motor vehicle is possible ,

The material forming the raceway and / or the pendulum track is in particular ferromagnetic. Preferably, the support flange and / or the pendulum mass is made of a ferromagnetic material.

The at least one pendulum mass of the centrifugal pendulum, under the influence of centrifugal force, endeavors to assume a position as far away as possible from the center of rotation. The "zero position" is thus the radially furthest from the center of rotation remote position, which can take the pendulum mass in the radially outer position. At a constant input speed and constant drive torque, the pendulum mass will assume this radially outer position. In the case of speed fluctuations, the pendulum mass deflects along its pendulum track due to its inertia. The pendulum mass can be moved in the direction of the center of rotation. The centrifugal force acting on the pendulum mass is thereby divided into one component tangentially and another component normal to the pendulum track. The tangential force component provides the restoring force which the pendulum mass wants to return to its "zero position" while the normal force component is responsive to the speed variations introducing force application element, in particular a connected to the drive shaft of the motor vehicle flywheel, for example, a primary mass or secondary mass of a dual mass flywheel, and there generates a counter-torque, which counteracts the speed fluctuation and attenuates the introduced speed fluctuations. For particularly high speed fluctuations, the pendulum mass can thus be maximally swung and assume the radially innermost position. For this purpose, the paths provided in the carrier flange and / or in the pendulum mass have suitable curvatures. In particular, more than one pendulum mass is provided. In particular, several pendulum masses can be distributed uniformly in the circumferential direction. The inert mass of the pendulum mass and / or the relative movement of the pendulum mass to the support flange is designed in particular for damping a specific frequency range of rotational irregularities, in particular an engine order of the motor vehicle engine. In particular, more than one pendulum mass and / or more than one support flange is provided. For example, the support flange is arranged between two pendulum masses and / or between two mass elements of a pendulum mass. Alternatively, the pendulum mass can be accommodated between two flange parts of the support flange, wherein the flange parts are connected to each other in a Y-shape, for example.

In particular, it is provided that the roller has a permanent magnet for generating the magnetic field or consists of a permanent magnet for generating the magnetic field. The permanent magnet can be inserted, for example, in a sleeve of the roller. The permanent magnet can thereby be formed cylindrically, while a three-dimensional outer contouring of the lateral surface of the roller can be formed exclusively by the sleeve. As a result, for example, a stop flange projecting in the radial direction and positioned in the axial direction between the pendulum mass and the carrier flange can be configured by the sleeve. The sleeve is in particular made of a metal, for example a magnetizable metal. In particular, the sleeve is ferromagnetic.

Preferably, a magnetic force generated by the magnetic field is greater than a weight force of the pendulum mass. As a result, the pendulum mass with insufficient centrifugal force no longer fall inward and produce associated impact noises, since the roller on the support flange and the pendulum mass in turn adheres to the roller. In this case, the magnetic force is strong enough to hold the pendulum mass without attacking centrifugal force at a given weight of the pendulum mass.

The invention further relates to the use of a permanent magnet in a roller of a provided for damping of a drive shaft of an automotive engine rotational irregularities centrifugal pendulum pendulum, which in particular as described above and can be further developed, for the purpose that in a striking a pendulum mass of the centrifugal pendulum in tangential direction, the roller on a track of a support flange of the centrifugal pendulum and / or on a pendulum track a pendulum mass of the centrifugal pendulum to absorb a stop pulse remains liable. Due to the magnetic field of the roller can at a tangential striking the pendulum a noisy back and forth beat the roller can be avoided by the roller magnetically adhere to a tail of the track and / or the pendulum track, so that a low-noise drive train of a motor vehicle is possible ,

The invention will now be described by way of example with reference to the accompanying drawings with reference to preferred embodiments, wherein the features shown below, both individually and in combination may represent an aspect of the invention. Show it:

1 : a schematic plan view of a centrifugal pendulum,

2 : A first embodiment of a schematic sectional view of the centrifugal pendulum 1 along the section line XX and

3 : A second embodiment of a schematic sectional view of the centrifugal pendulum 1 along the section line XX.

This in 1 shown centrifugal pendulum 10 has a support flange 12 on, for example, indirectly or directly to a drive shaft of a motor vehicle engine or coupled to the drive shaft dual mass flywheel can be connected. With the carrier flange 12 are pendulum masses 14 relatively over in careers 15 the carrier flange 12 and aerial tramways 16 the pendulum mass 14 guided rollers 18 coupled pendelbar. In the illustrated embodiment, the support flange 12 in the axial direction between two pendulum masses connected to each other 14 positioned. Alternatively, it is possible the pendulum mass 14 in the axial direction between two, for example, Y-shaped interconnected flange of the support flange 12 to position. Several pendulum masses 14 are evenly distributed in the circumferential direction with the support flange 12 connected.

As in 2 can show the roller 18 completely by a permanent magnet 20 be educated. In the axial direction between the support flange 12 and the pendulum mass 18 positioned stop rims 22 moving radially from the caster 18 can protrude through the material of the permanent magnet 20 be formed.

As in 3 can be compared to the in 2 illustrated embodiment of the roller 18 the permanent magnet 20 be formed cylindrical and in the axial direction in a sleeve 24 be plugged. In particular, the permanent magnet 20 in the sleeve 24 pressed. The stop boards 22 can in this case only by the material of the sleeve 24 be formed.

LIST OF REFERENCE NUMBERS

10

 centrifugal pendulum

12

 beam flange

14

 pendulum mass

15

 career

16

 aerial tramway

18

 caster

20

 permanent magnet

22

 stop board

24

 shell

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008059297 A1 [0002]

Claims (4)

Centrifugal pendulum for damping rotational irregularities introduced via a drive shaft of a motor vehicle engine with a carrier flange which can be connected to the drive shaft (US Pat. 12 ), at least one relative to the support flange ( 12 ) pendulum pendulum mass ( 14 ) for generating a rotational momentum opposing return torque and at least one in a raceway ( 15 ) of the carrier flange ( 12 ) and a aerial tramway ( 16 ) of the pendulum mass ( 14 ) guided roller ( 18 ) for guiding the pendulum mass ( 14 ) relative to the carrier flange ( 12 ), wherein the roller ( 18 ) one with the career ( 15 ) and / or the aerial tramway ( 16 ) has cooperating magnetic field. Centrifugal pendulum according to claim 1, characterized in that the roller ( 18 ) a permanent magnet ( 20 ) for generating the magnetic field or from a permanent magnet ( 20 ) for generating the magnetic field. Centrifugal pendulum according to claim 1, characterized in that a magnetic force generated by the magnetic field is greater than a weight force of the pendulum mass ( 14 ). Use of a permanent magnet in a roller ( 18 ) provided for damping by a drive shaft of an automotive engine rotational irregularities provided centrifugal pendulum ( 10 ), in particular according to one of claims 1 to 3, for the purpose that in a striking a pendulum mass ( 14 ) of the centrifugal pendulum ( 10 ) in the tangential direction the roller ( 18 ) on a career path ( 15 ) of a carrier flange ( 12 ) of the centrifugal pendulum ( 10 ) and / or on a tramway ( 16 ) of a pendulum mass ( 14 ) of the centrifugal pendulum ( 10 adheres to Absorbtion a stop pulse.

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