JP2011226479A - Pulley, torsional vibration damper and crankshaft of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further reduce generation of noise in a pulley or a torsional vibration damper.SOLUTION: The pulley or the torsional vibration damper is substantially completely covered, at the front face (1), with a soundproof panel (2) and coupled with the soundproof panel (2). The crankshaft includes the described pulley or the torsional vibration damper. The soundproof panel (2) is formed of a vacuum panel (3) or a mass panel.

Description

  The present invention relates to a pulley of an internal combustion engine, a torsional vibration damper, and a crankshaft in which a pulley or a torsional vibration damper is disposed at a free end thereof. In the present invention, all existing types of pulleys, particularly fixed and decoupled pulleys, are referred to as pulleys.

  A pulley or torsional vibration damper is used, for example, in the crankshaft of an internal combustion engine and is attached to the free end of the crankshaft. If the pulley is formed as a decoupled pulley, the belt drive, of which the pulley is a component, is decoupled from the vibration of the crankshaft of the internal combustion engine. The same applies to torsional vibration dampers.

  Internal combustion engine vibrations are caused, for example, by crankshaft rotation irregularities, which must be kept away from the belt drive and from the assembly driven by the belt drive. Don't be.

  Pulleys and torsional vibration dampers are usually formed in a deep pan shape, and undesirable air noise (also referred to as noise, abnormal noise, or radiated sound) is generated during operation of the pulleys or torsional vibration dampers. Radiated to the surroundings.

  According to Patent Document 1, a crankshaft of an internal combustion engine including a pulley attached to a free end is well known. In this prior art, in order to reduce noise generation during operation of the internal combustion engine, a sound absorbing material cap is mounted in a range where the pulley is connected to the crankshaft.

  In the above prior art, the pulley includes a rubber ring portion (rubber ring) between the pulley outer ring and the hub, where the outer diameter of the cap is slightly smaller than that of the rubber ring portion. The pulley is fixed to the end of the crankshaft of the internal combustion engine. The cap is preferably made of rubber, in particular neoprene rubber, and is fixed to the front face of the pulley, where the outer diameter of the cap substantially matches the inner diameter of the rubber ring. As a result, sealing is performed in terms of sound.

German Patent Application Publication No. 3409493 A1

  An object of the present invention is to develop a pulley or a torsional vibration damper so that the generation of noise is further reduced.

  In order to solve the above-mentioned problems, the invention according to claim 1 of the present application proposes a pulley characterized in that the front surface of the pulley is substantially completely covered by the soundproof panel and is connected to the soundproof panel.

  The invention according to claim 2 of the present application proposes a torsional vibration damper characterized in that the front surface of the damper is substantially completely covered by the soundproofing panel and coupled to the soundproofing panel.

  The invention according to claim 3 of the present application proposes the pulley or torsional vibration damper according to claim 1 or 2, wherein the soundproof panel is formed of a vacuum panel.

  In the invention according to claim 4 of the present application, the vacuum panel includes two shape stabilizing plates arranged in parallel to each other with an axial interval therebetween, and the two shape stabilizing plates are interposed therebetween. A pulley or a torsional vibration damper according to claim 3 is proposed.

  The invention according to claim 5 of the present application proposes the pulley or torsional vibration damper according to claim 4, wherein the shape stabilizing plate is made of a metal or a polymer material.

  The invention according to claim 6 of the present application proposes a pulley or a torsional vibration damper according to claim 1 or 2, wherein the soundproof panel is formed of a mass panel.

  The invention according to claim 7 of the present application is characterized in that the mass panel is formed of a mass plate made of a metal material, and a ratio of a diameter to a thickness of the mass plate is 20 to 40. Propose the described pulley or torsional vibration damper.

  Further, the invention according to claim 8 of the present application is a hub in which an elastic body made of a rubber elastic material is disposed in the gap formed by the gap while being surrounded by the vibration ring and spaced apart in the radial direction. A pulley or a torsional vibration damper according to any one of claims 1 to 7 is proposed.

  The invention according to claim 9 of the present application proposes the pulley or the torsional vibration damper according to claim 8, wherein the vibration ring has a V-groove portion for accommodating the belt on the outer peripheral surface.

  The invention according to claim 10 of the present application is characterized in that the soundproof panel is fixed to the vibration ring so as not to be directly or relatively displaced, the pulley or torsional vibration according to any one of claims 1 to 9. Propose a damper.

  The invention according to claim 11 of the present application is characterized in that the soundproof panel is fixed to the vibration ring by a decoupling element made of rubber elastic material. Propose vibration damper.

  The pulley or torsional vibration damper according to any one of claims 1 to 9, wherein the soundproof panel is fixed to the hub so as not to be directly or relatively displaced. Advocate.

  The invention according to claim 13 of the present invention is characterized in that the soundproof panel is fixed to the hub by a decoupling element made of rubber elastic material. Propose vibration damper.

  Furthermore, an invention according to claim 14 of the present application proposes a crankshaft of an internal combustion engine, characterized in that the pulley or the torsional vibration damper according to any one of claims 1 to 13 is disposed at a free end. .

  According to the present invention, the above problem is solved mainly by the features of claims 1 and 13. The related claims relate to advantageous forms.

  In order to solve the above problems, the present invention proposes a pulley or a torsional vibration damper in which each front surface is substantially completely covered by a soundproofing panel or is soundproofing (soundproofing) with the soundproofing panel. .

  In the above prior art, the cap is made of rubber, preferably neoprene rubber. Such a cap of such a material certainly provides the noise-preventing effect of pulleys or torsional vibration dampers, which, from the current point of view, is also an internal combustion engine in terms of increasing driver comfort requirements. In terms of noise radiated to the surroundings, it is no longer sufficient.

  Such caps need to vary in thickness depending on the desired frequency range of action. The deeper the effective frequency range, the thicker the absorbing material. For automotive applications, installation space is usually not sufficient to achieve sufficiently good results with such caps.

  In the present invention, the soundproof panel can be formed in a disk shape. Such a member can be manufactured easily and inexpensively.

  The excellent effect when the empty space is small is achieved by the sound insulation panel being coupled to the front surface of the pulley or torsional vibration damper in sound insulation. This sealing soundproof panel before the pulley or torsional vibration damper can be variously formed in this case.

  According to the first embodiment, the soundproof panel can be formed by a vacuum panel. The vacuum in the sound insulation panel interrupts the transmission propagation of the sound insulation panel, thereby providing a high insulation effect.

  The vacuum panel may comprise two form-stabilizing plates spaced axially apart and parallel to each other, where the plates define a vacuum space therebetween.

  The plate can be made of a metal or polymer material. If the material of the plate is, for example, metal, for example, sheet metal, the vacuum panel can be manufactured easily and inexpensively. However, the plate can also consist of a polymer material. In this case, the polymeric material is sterile and can therefore be used, for example, in places affected by moisture. Therefore, the performance characteristics of such a vacuum panel are kept constant, especially during long periods of use.

  According to another form, it can be proposed that the soundproof panel is formed by a mass panel. Like the vacuum in the first embodiment described above, a large mass of mass panels also causes an interruption of transmission propagation of the soundproof panel and a high insulation effect.

  In order to achieve a relatively large mass of mass panels, it is proposed that the mass panels are formed by mass panels of metallic materials with a mass plate diameter to thickness ratio of 20-40 (20: 1-40: 1). it can.

  The pulley or torsional vibration damper may comprise a hub surrounded by an outer peripheral surface at a radial interval by a vibration ring, wherein the gap formed by the interval includes an elastic material of rubber elastic material. The body is arranged. The hub is normally fixedly coupled with the crankshaft of the internal combustion engine (so as not to be relatively displaced). In order to isolate the vibration from the vibration ring of the internal combustion engine described at the beginning, an elastic body made of a rubber elastic material that connects the hub and the vibration ring to each other has been proposed.

  The vibration ring can have a V-groove for accommodating (engaging) the belt on its outer peripheral surface. In this case, all V-groove parts that can accommodate commercially available belts are included.

  A particularly simple form of pulley or torsional vibration damper is obtained when the soundproof panel is fixed directly and immovably on the vibration ring or hub. Such immobilization results in a clear reduction in the sound of air already radiated, but here some of the advantageous effects are that the immovably connected sound insulation panel itself is excited to vibration by vibration excitation, and Thereby, it can be absorbed by radiating undesired air sounds on the soundproof panel side.

  In order to avoid vibration excitation of the sound insulation panel itself during operation of the pulley or torsional vibration damper and thereby radiating unwanted air noise, the sound insulation panel is fixed to the vibration ring or hub by a decoupling element of rubber elastic material. It has been proposed that The soundproofing panel is thereby decoupled from the vibration ring or hub in terms of vibration technology and its effect is thereby optimized.

  Furthermore, as described above, the present invention relates to a crankshaft of an internal combustion engine having a pulley or a torsional vibration damper disposed at a free end of the crankshaft. The crankshaft in this configuration has a compact size at its free end and exhibits an excellent effect in minimizing the emission of aerial sound during operation of the pulley or torsional vibration damper. Due to their excellent effect despite their compact dimensions, pulleys or torsional vibration dampers and crankshafts with such pulleys or torsional vibration dampers are particularly suitable for use in motor vehicles.

It is a figure which shows the decoupled pulley which uses the vacuum panel currently fixed to the vibration ring by the decoupling element as a soundproof panel. FIG. 2 shows a decoupled pulley similar to the decoupled pulley of FIG. 1 with a vacuum panel fixedly secured to the vibrating ring. FIG. 2 shows a decoupled pulley similar to the decoupled pulley of FIG. 1 with a vacuum panel coupled to the hub by a decoupling element. FIG. 9 shows a fourth embodiment of a decoupled pulley similar to the decoupled pulley of FIG. 2 with a vacuum panel fixedly coupled to the hub. FIG. 7 shows a fifth embodiment of a decoupled pulley in which the soundproof panel is formed as a mass panel and is coupled to the vibrating ring by a decoupling element. FIG. 6 shows a sixth embodiment similar to the embodiment of FIG. 5 in which the mass panel is coupled to the hub by a decoupling element.

  Hereinafter, six embodiments of the present invention will be described in detail with reference to FIGS. Each of these is shown schematically.

  FIGS. 1 to 6 each show a decoupled pulley (flywheel), but a hub (hub ring) 11 is surrounded by an oscillating ring (flywheel ring) 12 on the outer peripheral surface at a radial interval. Here, an elastic body (rubber ring) 14 of a rubber elastic material is disposed in the gap 13 formed by the interval (by the elastic body 14 being disposed between the hub 11 and the vibration ring 12). Vibration is insulated or isolated).

  The crankshaft end (free end) 17 of the crankshaft is fixedly coupled to the hub 11 and drives a decoupled pulley. The hub 11 can be made of deep drawn sheet metal, for example, as is customary in general.

  In the embodiment shown here, the vibration ring 12 has a V-groove part (profiling part) 15 for accommodating a belt not shown here on the outer peripheral surface. The illustration of the V-groove is understood as a schematic diagram, and the V-groove 15 is variously formed depending on the belt used.

  The elastic body 14 disposed inside the gap 13 is used for vibration technical decoupling of the hub 11 and the vibration ring 12. The vibration, for example, the vibration irregularity of the internal combustion engine, does not reach the vibration ring 12 via the crankshaft and the hub 11 by the elastic body 14 and is driven by the elastic body 14 by belt driving and belt driving. Never reach the device.

  The decoupled pulley shown in FIGS. 1 to 6 is a simple pulley (a deep pan-like pulley that is directly fixed to the crankshaft end 17 and has a V-groove 15 disposed on the outer peripheral surface. A pulley consisting of only one or a plurality of rigid parts as components and provided with a V-groove part) or a torsional vibration damper (the hub 11 has a belt V-groove part 15 not on the outer peripheral surface, and is spaced radially by a vibration ring 12. An elastic body 14 made of a rubber elastic material is disposed in a gap 13 surrounded by the space 13 formed here, and includes a hub, an elastic body and a vibration ring as components, and no V-groove portion is provided. Can also be formed.

  The sound insulation panel 2 is critical in order to minimize air sound radiation. Various configurations of the sound insulation panel 2 and their arrangement with decoupled pulleys are shown in FIGS.

  1 to 4 each show a decoupled pulley with a soundproof panel 2 formed by a vacuum panel 3. The vacuum panel 3 has two form stabilizing plates 4 and 5 arranged in parallel to each other at an axial interval, and these define a vacuum space 6 therebetween. The sound insulation panel 2 is coupled to the front surface 1 of the pulley in a sound insulating manner. The transmission of soundproof panel 2 is interrupted by the vacuum, and this results in a clear reduction of the aerial sound radiated in the direction of the environment.

  In FIG. 1, the vacuum panel 3 is fixed to the vibration ring 12 by a decoupling element (vibration insulating element or vibration isolation element) 16 made of a rubber elastic material. This flexible coupling of the soundproof panel 2 by the decoupling element 16 causes the soundproof panel 2 itself to start unnecessary vibrations due to the vibration excitation of the pulleys, thereby preventing air sounds from being emitted to the soundproof panel 2 side. . The decoupling element 16 is an annular body and is fixed to the inner peripheral surface of the vibration ring 12. The decoupling element 16 is separate from the elastic body 14, but may be integrally formed with the elastic body 14.

  FIG. 2 shows a second embodiment. Unlike the embodiment of FIG. 1, the vacuum panel 3 is fixed directly and immovably to the vibrating ring 12. Such a configuration is simple and inexpensive in terms of structure and economy. The vacuum panel 3 is directly fixed to the inner peripheral surface of the vibration ring 12.

  FIG. 3 shows a third embodiment in which the vacuum panel 3 is fixed to the hub 11 by a decoupling element 16. In this case, the decoupling element 16 and the elastic body 14 are formed integrally and in a unified material, which is advantageous in terms of simple manufacture of the pulley. The decoupling element 16 is an annular body and is fixed to the end surface of the hub 11. The decoupling element 16 is integrally formed with the elastic body 14, but may be separate from the elastic body 14.

  In FIG. 4, the vacuum panel 3 is directly and immovably coupled to the hub 11. The vacuum panel 3 is directly fixed to the end face of the hub 11.

  In general, the sound insulation panel 2 must be properly managed with respect to the components to which it is secured in order to minimize noise as well as the unbalance of the center of gravity and the resulting high mechanical loads. The risk of unbalance of the center of gravity is reduced to a minimum by the stationary coupling of the soundproof panel 2 shown in FIGS.

  When a rubber annular sound insulation panel 2 having a rectangular cross section is used, the sound insulation panel 2 is more rigid and vertical in the rubber plate surface, and thus in the compression direction, and is therefore flexible in the rubber thrust direction. . The sound insulation panel 2 is thereby properly managed on the pulley surface.

  It is advantageous if the vibration propagated from the internal panel side facing the engine to the external panel side by the individual propagation sound is small. This is achieved by the absence of a support, for example a bar, between the plates 4, 5 inside the vacuum space 6. A connecting portion is formed flexibly at the contact portion of both plates 4 and 5.

  5 and 6, each of the soundproof panels 2 is formed as a mass panel 7. Here, the mass panel 7 is formed by a mass plate 8 made of a metal material. In the embodiment shown here, the ratio of the diameter 9 to the thickness 10 of the mass plate 8 is about 30 (30: 1).

  In FIG. 5, the mass plate 8 is fixed to the vibration ring 12 by the decoupling element 16 and is coupled to the vibration ring 12 in a sound-insulating manner, like the vacuum panel 3 of FIG. 1. The decoupling element 16 is an annular body and is fixed to the inner peripheral surface of the vibration ring 12. The decoupling element 16 is separate from the elastic body 14, but may be integrally formed with the elastic body 14.

  FIG. 6 shows a sixth embodiment which, in terms of its form, substantially matches the embodiment of FIG. The mass plate 8 is elastically flexible and sound-insulating with the hub 11 by a decoupling element 16. In the embodiment shown here, the decoupling element 16 and the elastic body 14 are formed in two parts. Thereby each of the members can be individually adapted to the respective application. The decoupling element 16 is an annular body and is fixed to the end surface of the hub 11. The decoupling element 16 is separate from the elastic body 14, but may be integrally formed with the elastic body 14.

DESCRIPTION OF SYMBOLS 1 Front 2 Soundproof panel 3 Vacuum panel 4,5 Plate 6 Vacuum space 7 Mass panel 8 Mass plate 9 Diameter 10 Thickness 11 Hub 12 Vibrating ring 13 Gap 14 Elastic body 15 V groove part 16 Decoupling element 17 Crankshaft end

Claims (14)

  A pulley characterized in that the front surface (1) of the pulley is substantially completely covered by a soundproof panel (2) and connected to the soundproof panel (2).   A torsional vibration damper, characterized in that the front surface (1) of the damper is substantially completely covered by a soundproof panel (2) and is connected to the soundproof panel (2).   The pulley or torsional vibration damper according to claim 1 or 2, wherein the soundproof panel (2) is formed by a vacuum panel (3).   The vacuum panel (3) includes two shape stabilizing plates (4, 5) arranged in parallel to each other at an axial interval, and the two shape stabilizing plates (4, 5). 4. The pulley or torsional vibration damper according to claim 3, characterized in that defines a vacuum space (6) between them.   5. The pulley or torsional vibration damper according to claim 4, wherein the shape stabilizing plate (4, 5) is made of a metal or a polymer material.   The pulley or torsional vibration damper according to claim 1 or 2, wherein the soundproof panel (2) is formed by a mass panel (7).   The mass panel (7) is formed of a mass plate (8) made of a metal material, and the ratio of the diameter (9) to the thickness (10) of the mass plate (8) is 20 to 40. The pulley or torsional vibration damper according to claim 6.   The hub (11) is surrounded by the vibration ring (12) at an outer peripheral surface at a radial interval, and an elastic body (14) of a rubber elastic material is disposed in the gap (13) formed by the interval. The pulley or the torsional vibration damper according to any one of claims 1 to 7, wherein   9. The pulley or torsional vibration damper according to claim 8, wherein the vibration ring (12) has a V-groove (15) for accommodating the belt on the outer peripheral surface.   The pulley or torsional vibration damper according to any one of claims 1 to 9, wherein the soundproof panel (2) is fixed to the vibration ring (12) so as not to be directly or relatively displaced.   10. The pulley or torsional vibration damper according to claim 1, wherein the soundproof panel (2) is fixed to the vibration ring (12) by a decoupling element (16) made of a rubber elastic material. .   The pulley or torsional vibration damper according to any one of claims 1 to 9, wherein the soundproof panel (2) is fixed to the hub (11) so as not to be directly or relatively displaced.   The pulley or torsional vibration damper according to any one of claims 1 to 9, wherein the soundproof panel (2) is fixed to the hub (11) by a decoupling element (16) made of rubber elastic material.   A crankshaft of an internal combustion engine, wherein the pulley or torsional vibration damper according to any one of claims 1 to 13 is disposed at a free end.

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