FR3050001A1 - CENTRIFUGAL PENDULUM WITH SLIDING ELEMENT FOR PENDULAR MASSES - Google Patents

Abstract

The invention relates to a centrifugal pendulum (1) of a transmission of a vehicle with internal combustion engine, wherein the transmission comprises at least one flywheel (4) rotating about an axis of rotation (3), which is associated with a support member (2) of the centrifugal pendulum (1). The centrifugal pendulum (1) includes pendular masses (10), which effect a relative displacement with respect to the flywheel (4) in case of irregularity of rotation in the transmission under the action of the centrifugal force, in connection with at least one sliding guide (11) and rolling rollers (13). The pendulum masses (10) elastically coupled by means of a pressure spring (14) in the circumferential direction are surrounded externally by a protective device (15) forming an anti-burst protection. Depending on an angle of oscillation or compression of the pressure spring (14), it is guided by a sliding element (17) separated against the protective device (15).

Description

The invention relates to a centrifugal pendulum of a transmission of an internal combustion engine vehicle where the transmission of a vehicle with internal combustion engine, where the transmission comprises at least one steering wheel. inertia rotating about an axis of rotation, which is associated with a support member of the centrifugal pendulum including pendular masses, which perform a relative movement relative to the flywheel in case of irregularity of rotation in the transmission under the action of the centrifugal force, in conjunction with at least one sliding guide and rolling rollers, the pendulum masses being elastically coupled by means of a pressure spring in the peripheral direction and an anti-bursting protection surrounding the outermost pendulum masses in the radial direction.

The operation due to the construction of the crankshaft of an internal combustion engine with reciprocating pistons, and the resulting combustion processes during rotation cause it to be subjected to superimposed torsional vibrations passing through the transmission of the motor vehicle. To reduce these oscillations, a known solution is to use a centrifugal pendulum, which in particular in combination with a bi-mass flywheel reduces at least the irregularities of rotation appearing on the transmission. In case of accelerated rotation of a shaft, the centrifugal pendulum accumulates energy released again when the rotation of the shaft is slowed down. The construction of a known centrifugal pendulum has at least one pendular mass suspended from a rotating support member or a pendulum flange, in particular by means of spherical bearings or the like. In this case, the pendulum may move relative to the support member along prescribed slide guides. The structure and operation of such a centrifugal pendulum are described in DE 10 2006 028 552 A1.

Document DE 10 2009 042 836 A1 discloses a centrifugal pendulum consisting of a fixed pendulum flange connected to a component of a torque transmission device and of several peripherally distributed pendulum masses and disposed on both sides of the flange. pendulum, and pivoting in a limited manner with respect thereto. Two axially opposite pendulum masses are connected by connecting elements to form a modular unit, the opposing pendulum masses having two respective first sliding paths spaced from each other and the pendulum flange of the second sliding paths complementary to those on which rolling bodies respectively roll. At least one connecting element placed between the pendulum masses simultaneously forms a stop element limiting the pivoting of the pendulum masses.

DE 10 2012 221 103 A1 and WO 2015/149789 A1 disclose respective centrifugal pendulum devices consisting of a pendular mass support and at least two pendulum masses pivotally housed along a pendulum bearing track. Coupling means formed as helical pressure springs are provided in the circumferential direction between the ends of two contiguous pendulum masses, said contiguous pendulum masses being thus elastically connected. The springs rest in receptions at the ends of the pendular masses. The pendulum masses and the springs together form an oscillating system with a suitable resonant frequency.

DE 10 2014 204 153 A1 discloses a centrifugal pendulum cooperating with a flywheel bi-mass. The centrifugal pendulum with known mode of action has a largely conventional construction. In a complementary manner, the centrifugal pendulum includes a piece of disk surrounding the pendulum masses radially in the radial direction and forming an anti-burst protection. The aim of the invention is to provide a guide of pressure springs optimized against noise and wear, and durable for a centrifugal pendulum, by means of simple and economically feasible construction measures.

This problem is solved by the object of the present invention. Various advantageous embodiments of the subject of the present invention are described below.

According to the invention, there is provided a centrifugal pendulum, such as in service state the pressure springs are guided by means of a separate sliding element against the protection device forming the anti-burst protection, depending on their degree deflection or pivot angle.

When the oscillation angle is maximum, the strongly compressed pressure spring advantageously rests and is guided against the anti-clogging protection by its radially outer surfaces not directly, but indirectly by means of the sliding element according to the invention. This measure according to the invention reduces the radial spacing between the pressure spring and the anti-burst protection, a damaging buckling of the pressure spring thus being effectively prevented. On the centrifugal pendulums existing until today, the damaging buckling occurred in particular during the start-up phase and that of stopping the internal combustion engine due to a maximum pivot angle, at least a central portion of the pressure spring shifting radially outwardly inadmissible under the effect of centrifugal force. The buckling leads to increased tension in the turns of the pressure spring as well as increased wear by contact of the pressure spring with the surrounding construction, associated with the risk of breakage of the spring and failure of the centrifugal pendulum. The sliding element according to the invention, which allows an implementation accuracy or an exact mounting position of the pressure springs between the pendular masses, advantageously decreases and decisively wear of these pressure springs. This measurement simultaneously has a positive impact on the resistance time and longevity of the pressure springs and therefore of the centrifugal pendulum as a whole. In operating condition with a high engine internal combustion engine speed and a reduced or minimal oscillation angle of the centrifugal pendulum, substantially no shortening of the pressure spring occurs, at least one central region of the pressure spring pressing against the sliding element due to the centrifugal force. The application of the sliding element against the anti-burst protection or the pressing of the pressure spring against the sliding element limits the friction to a minimum, resulting in greater stability of the centrifugal pendulum and consequently of the suspension system. The sliding element according to the invention of simple construction and economical manufacturing makes it possible advantageously to realize a centrifugal pendulum of improved structure and operation, optimized against wear and durable. The concept according to the invention also has a positive effect on noise emissions, a direct metallic contact between the pressure spring and the anti-splash protection being avoided. Due to its symmetrical configuration, the sliding element does not advantageously need to be positioned in an oriented manner during assembly. In addition, the sliding element cooperating with the pressure spring is advantageously integrable in the defined construction space of the centrifugal pendulum and can therefore be subsequently mounted if necessary.

According to an advantageous embodiment of the invention, it is intended to set up a sliding element designed as a guide shoe. The guide shoe is supported externally by adhesion with guide arms in the form of circular arcs against turns of the pressure spring. For long-lasting positioning, the radially pre-stressed guide arms are clipped onto the pressure spring. The guide arms of the sliding element designed as a guide shoe preferentially surround the pressure spring over an angle greater than or equal to 240 °. In addition to the clipping, it is advisable to provide the interior of the projecting nipples protruding nipples or local flanges that engage by correspondence of shape and play in the annular gap between the turns of the pressure spring. To assist a fixed mounting position of the guide shoe, it relies in particular on an outer contact surface flattened on the anti-burst protection when the compression spring is compressed. The guide shoe also advantageously includes axial guide surfaces on both sides, by means of which the pressure springs are guided in particular against flanges of the centrifugal pendulum in mounting state.

As an alternative to a guide shoe, the invention comprises a friction ring as a sliding element, which is placed in a peripheral annular groove of the protection device forming an anti-burst protection or in a steering wheel. primary or secondary inertia of the transmission. With a single sliding element positioned on the outer face, opposite to the axis of rotation, of the connected protection device p. ex. to a support element, all pressure springs are simultaneously effectively protected against damaging buckling. To facilitate the mounting of the sliding element made as a friction ring in the annular groove of the protection device provided as an anti-splash protection, the friction ring includes a separation seam. The sliding element further has, internally opposed to the pressure spring, an inner contour with an outer round corresponding to the pressure spring. This measurement ensures optimal guiding in the event of contact of the pressure spring against the sliding element.

It is further provided by the invention that the sliding elements made as a guide shoe or as a friction ring are made of durable plastic material. In particular, a temperature-resistant and wear-resistant plastics material having a high dimensional stability is suitable for this purpose, such as a glass-fiber reinforced polyamide, a thermosetting plastic or a thermoplastic resin. This plastic material advantageously has a coefficient of friction lower than the material of the pressure spring, so that if the pressure spring is pressed against the sliding element, the action of the centrifugal pendulum does not influence, or does not influence that little oscillation of the pendulum mass.

A preferred construction provides a centrifugal pendulum designed as double-ended centrifugal pendulum. The pressure spring and the pendular masses are in this case guided between two axially spaced pendulum flanges in connection with a sliding guide and rollers and resiliently coupled by a pressure spring. Each pendulum mass preferably consists of two lateral pieces as well as a central piece, these components being p. ex. riveted to obtain a modular unit. The pendulum flanges advantageously have a reduced wall thickness at the pressure spring, to allow the establishment of a large pressure spring or a pressure spring of greater capacity.

Another embodiment of the invention provides that each end side of the pressure spring is centered and fixed on a mandrel of the pendular masses disposed in axial projection in the circumferential direction. The mandrel which can alternatively also be made as a formally engaged pin in the pressure spring is in this case positioned frontally in a recess at an outer region of the pendulum mass, so as to always support the pressure spring against the sliding element in case of deflection, radial offset. The invention also relates to a construction of the centrifugal pendulum where a single-stage helical pressure spring is used as a pressure spring, or where a multi-stage arrangement is provided comprising two concentrically assembled pressure springs.

The centrifugal pendulum built according to the invention and comprising at least one sliding element is associated with a rotating part of the torque transmission device in the transmission of the vehicle. For this purpose, the centrifugal pendulum can in particular be combined with a monomer flywheel, a dual mass flywheel, a double clutch damper or a component of a separation clutch. The invention will be described and explained in detail hereinafter with reference to the exemplary embodiments illustrated by the figures. The invention is however not limited to these exemplary embodiments. The figures represent:

Fig. 1 a partial view of a centrifugal pendulum, constructed as a centrifugal double-flange pendulum mit with a first embodiment of a sliding element according to the invention;

Fig. 2 the double-flange centrifugal pendulum of FIG. 1 in another partial view;

Fig. 3 the pressure spring with the corresponding sliding element in enlarged fragmentary view;

Fig. 4 the sliding element associated with the pressure spring as an individual piece in lateral view;

Fig. The sliding element associated with the pressure spring as an individual piece in front view;

Fig. 6 a partial view of a double flange centrifugal pendulum with a second embodiment of a sliding element according to the invention;

Fig. 7 the double-flange centrifugal pendulum of FIG. 6 in another partial view;

Fig. 8 the sliding element of FIG. 6 as an individual piece in perspective view; and

Fig. 9 a cross sectional profile of the sliding element of FIG. 6.

Figs. 1 and 2 show in partial views the basic structure of a centrifugal pendulum 1 constructed according to the invention with components of a surrounding construction of a transmission of a vehicle, not shown at all. The centrifugal pendulum 1 is connected by a support member 2 to a flywheel 4 rotating about an axis of rotation 3 and constructed p. ex. in the form of flywheel monomer or bi-mass. Two pendulum flanges 5, 6 are associated with the support element 2, which are assembled by means of segments 7, 8 opposite to the axis of rotation 3 and in the form of a cup and are fixed integrally in rotation to the element 2. At a distance from the axis of rotation 3, each pendulum flange 5, 6 is bent away from the other to form an annular space 9 provided for the reception of pendular masses 10. The pendulum masses 10 distributed on the periphery in staggered state of one another are displaceable in case of irregularity of rotation in the transmission under the action of the centrifugal force, by means of a sliding guide 11, of guide pins 12 and rolling rollers 13, with a known effect with respect to the support element 2 or the flywheel 4. In the peripheral direction, the pendulum masses 10 are resiliently coupled by a pressure spring 14 which is furthermore surrounded by with radial spacing by a protection device 15 forming an anti-clogging protection. As a burst protection is provided a cylindrical protection plate 16 fixed against the flywheel 4. A sliding element 17 is associated with each pressure spring 14, on which the pressure spring 14 is supported at least when an angle maximum oscillation is achieved. following the displacement of the pendular masses 10, against the protection device 15 provided as anti-burst protection, so as to limit friction and / or wear. As a measure for accommodating larger compression springs 14, the pendulum flanges 5, 6 have sections 18, 19 with reduced wall thickness. The arrangement or the mounting position of the sliding element 17 designed as a guide shoe is visible in enlargement in FIG. 3, a pendulum flange 6 being masked. The pressure spring 14 is in this case shown in a neutral position corresponding to an oscillation angle of 0 °. In this mounting position, a gap 20 may be formed between the sliding member 17 and the attachment plate 16 serving as an anti-splash protection, so that there is no frictional contact between these components, or only a contact minimal friction which may adversely affect the operation of the centrifugal pendulum 1. In other operating conditions of the centrifugal pendulum 1, in particular in the starting and stopping phase of the internal combustion engine, where angles of rotation are formed. high oscillation, the sliding element 17 bears directly against the fixing plate 16, the anti-burst protection. In these phases, the spring turns 21 tend, under the effect of the centrifugal force, to deform in a maximum radius with respect to the axis of rotation 2, the sliding element 17 preventing a damaging buckling of the spring of pressure 14. For fixing in position of the sliding element 17, it comprises two guide arms 27, 28 in an arc of a circle, shown in FIG. 4 and fig. 5, which are supported externally by adhesion against turns 21 of the pressure spring 14. In the mounting state, the compression spring 14 is supported by end turns against the end faces of the pendular masses 10 and is simultaneously centered. on a mandrel 22 projecting axially in a recess 23 of the pendulum mass 10.

Figs. 4 and 5 show different views of the sliding member 17 as a guide shoe as an individual piece. As a measure ensuring a stable mounting position against the burst protection when the pressure spring 14 is compressed, the sliding member 17 comprises a flattened flat outer contact surface 24, from which a rounded outer contour extends into all directions. To ensure a durable positioning, the radially pre-constrained guide arms 27, 28 of the sliding element 17 are clipped onto the pressure spring 14. The guide arms 27, 28 then preferentially surround the pressure spring 14 on an angle a> 240 °. In addition to the clipping, it is advisable to provide the inside of the guide arms 27, 28 with projecting partial flanges 25, 26 which engage by shape matching and with clearance in the annular gap between the turns 21 of the spring of FIG. pressure 14. The guide shoe or the sliding element 17 furthermore form on both sides axial guide surfaces 29, 30, by means of which the pressure spring 14 is guided on the flanges 5, 6 of the centrifugal pendulum 1. mounting state.

Figs. 6 and 7 show in partial views the basic structure of another exemplary embodiment of a centrifugal pendulum 31 constructed according to the invention with components of a surrounding construction of a transmission of a vehicle, not shown in FIG. remaining. The centrifugal pendulum 31 is connected by a support element 32 to a flywheel 34 rotatable about an axis of rotation 33. Two pendulum flanges 35, 36 are associated with the support element 32, which are assembled at means of segments 37, 38 opposed to the axis of rotation 33 and are connected to the support member 32. At a distance from the axis of rotation 33, each pendulum flange 35, 36 is bent away from the other to form an annular space 39 provided for the reception of pendulum masses 40. The pendulum masses 40 distributed on the periphery are movable under the action of the centrifugal force, by means of a sliding guide 41, of guide pins 42 and rollers 43, with a known effect with respect to the flywheel 34. In the peripheral direction, the pendulum masses 40 are elastically coupled by a pressure spring 44 which is further surrounded with a radial spacing l by a protection device 45 forming anti-burst protection. Is provided as anti-bursting protection a cylindrical fixing plate 46 fixed against the flywheel 34. A sliding element 47 in the protection device 45 provided as anti-burst protection is associated with each pressure spring 44, on which the The pressure spring 44 is supported at least when a maximum oscillation angle is reached, so as to limit friction and / or wear. A friction ring is provided as a sliding element 47, which is placed in a peripheral annular groove 48 of the protection device 45. FIG. 6 shows the pendulum mass 40 formed of three assembled components and comprising the two lateral pieces 51 and a central piece 52, which are p. ex. riveted to obtain a modular unit.

Figs. 8 and fig. 9 show in different partial views the sliding element 47 configured as a friction ring as an individual piece. To facilitate assembly, the sliding element 47 is as shown in FIG. 8 sectioned and provided with an oblique separation joint. Fig. 9 represents the cross sectional profile of the sliding element 47, which has on its inner face a curved inner contour 50 fitted to the outer rounding of the pressure spring 44.

List of reference signs 1 Centrifugal pendulum device 2 Support element 3 Rotation axis 4 Flywheel 5 Pendulum flange 6 Pendulum flange 7 Segment 8 Segment 9 Annular space 10 Pendular mass 11 Sliding guide 12 Guide pin 13 Roller 14 Pressure spring 15 Protective device 16 Protective plate 17 Sliding element 18 Section 19 Section 20 Interstice 21 Spring spire 22 Mandrel 23 Recess 24 Contact surface 25 Edge 26 Edge 27 Guide arm 28 Guide arm 29 Surface guide 30 Guide surface 31 Centrifugal pendulum 32 Support element 33 Rotor shaft 34 Flywheel 35 Pendulum flange 36 Pendulum flange 37 Segment 38 Segment 39 Annular space 40 Pendulum mass 41 Slide guide 42 Guide pin 43 Roller 44 Pressure spring 45 Protective device 46 Protective plate 47 Sliding element 48 Annular groove 49 Separation splice 50 Contour 51 Side piece 52 Center piece A Angular measurement of sliding element-guide arm

Claims (10)

claims 1. Centrifugal pendulum (1) of a transmission of a vehicle with an internal combustion engine, in which the transmission comprises at least one flywheel (4, 34) rotating about an axis of rotation (3, 33) , which is associated with a support member (2, 32) of the centrifugal pendulum (1, 31) including pendulum masses (10, 40), which move relative to the flywheel (4, 34) in case of irregularity of rotation in the transmission under the action of the centrifugal force, in connection with at least one sliding guide (11, 41) and rollers (13, 43), the pendulum masses (10, 40) being resiliently coupled by means of a pressure spring (14, 44) in the circumferential direction and an anti-bursting protection surrounding the pendulum masses (10, 40) radially in the radial direction, characterized in that according to an angle of oscillation or compression of the pressure spring (14, 4 4), it is guided by a sliding element (17, 47) separated against the protection device (15, 45) forming an anti-burst protection. 2. Centrifugal pendulum according to claim 1, characterized in that a sliding element (17) formed as a guide shoe is provided, which surrounds turns (21) directly outside the pressure spring (14). 3. centrifugal pendulum according to claim 2, characterized in that guide arms (27, 28) in the form of circular arcs of the sliding element (17) are clipped by shape correspondence and / or friction on the turns (21) of the pressure spring (14). 4. Centrifugal pendulum according to claim 1, characterized in that a friction ring is provided as a sliding element (47), which is put in place in an annular groove (48) peripheral device protection (45) of the support member (32) provided as burst protection. 5. Centrifugal pendulum according to claim 4, characterized in that the sliding element (47) has a separating seam (49) as an assembly aid and includes a curved inner contour (50) opposite the pressure spring (44) and complementary to an outer rounding of the pressure spring (44). 6. Centrifugal pendulum according to one of the preceding claims, characterized in that the sliding elements (17, 47) formed as a guide shoe or as a friction ring are made of wear-resistant plastics material. Centrifugal pendulum according to one of the preceding claims, characterized in that the centrifugal pendulum (1, 31) is constructed as a double flange centrifugal pendulum and comprises two axially spaced apart pendulum flanges (5, 6; 35, 36). between which are mounted the pendulum masses (10, 40) and the pressure spring (14; 44). 8. Centrifugal pendulum according to one of the preceding claims, characterized in that the pressure springs (14, 44) are centered and fixed in position by each of the two ends on a mandrel (22) pendulum masses (10, 40). arranged in axial projection in the peripheral direction. 9. Centrifugal pendulum according to one of the preceding claims, characterized in that a helical spring with one or more stages of construction is provided as a pressure spring (14, 44). 10. Centrifugal pendulum according to one of the preceding claims, characterized in that the centrifugal pendulum (1, 31) including at least one sliding element (17, 47) is associated with a rotating monomer flywheel, a flywheel bi-mass inertia or clutch separation.