JP3177056U - Overrunning pulley with elastomeric torsional damping system - Google Patents

Abstract

In an automotive alternator, an overrunning pulley having an elastic torsional damping system is provided.
An overrunning pulley having an elastomeric torsional damping system comprises a flexible washer A, two rollers B aligned in parallel, and a washer C. Preferably, it has a pulley 1 coupled to an automobile alternator, an outer ring 2B and a cam 2C forming an overrun assembly 3 having a roller 3A, an elliptical spring 3B and a plastic cage 3C. It is comprised from the center integral casting part 2 containing 2 A of external many V-shapes. In addition, an elastomer torsional damping system 4 is provided that includes a retaining ring 4A, an outer shaft 4B, an elastomer 4C, two cylindrical bushings 4D, and an inner shaft 4E having a keyway insert 4F for a fitting. .
[Selection] Figure 4

Description

(Overview)
The present invention relates to the technical field of parts for the automotive sector, and more particularly torsion received by the entire system coupled to the belt, preferably used in an alternator coupled to the crankshaft through the belt. The present invention relates to an overrunning pulley having an elastomeric torsional damping system that has the purpose of absorbing and reducing vibrations, while also reducing the rotational changes caused by rollers transmitted to the alternator through a clutch.

(Technology status)
The alternator pulley has a function of transmitting torque from the internal combustion engine to the alternator through a belt passing through a pulley fixed to the engine crankshaft. Friction between the belt and pulley transmits torque to the alternator rotor shaft. Alternator pulleys rigidly coupled on the alternator rotor shaft (without an overrunning system) have made significant technological advances due to the inclusion of an overrunning system.

  However, due to the inclusion of a partial cylinder deactivation system and / or reduced engine low speed operation that attempted to reduce emissions and reduce consumption, the belt Better separation of torsional vibrations is required for the entire system of coupled accessories.

  As such, a new alternator pulley design has been developed to perform this additional function. In this new functional line, two systems can be added to this damping characteristic in the alternator pulley.

  What is first described here is that of the pulley once involved in the transmission of torque from the crankshaft pulley by means of a damping element that allows only a small degree of rotation between the shaft and pulley when compressed. When the connection between the external shape and the shaft coupled to the alternator is made, it does not have an overrunning function. This leads to the inefficiencies of the components in reducing the noise generated by the pulley-to-belt movement (slip) that occurs at large rotational changes provided by the acceleration and deceleration of the engine. .

  This system does not reduce the wear of the auxiliary belt unless the rotational inertia of the alternator is preserved during deceleration. Therefore, a torque larger than necessary is required in a system having overrunning.

  Another existing concept uses a helical spring as a form of coupling between the outer part of the pulley and the shaft connected to the alternator, which is involved in the transmission of torque from the engine.

  This system is such that the pulley has an overrunning function once the inertia of the alternator during deceleration exerts a force on the shaft in a manner that allows relative movement between the outer portion and the shaft relative to the spring. Enable. However, the increased minimum force to reach the necessary twist due to the presence of this movement for this spring makes the overrun less efficient, and this property has been observed in a rigid pulley Can lead to the same drawbacks.

  If the spring does not have the necessary properties to damp vibrations, a plastic element must be added to the system that frictionally dissipates the energy from the compression of the spring during torque transmission to the alternator. This system has the disadvantage of suffering severe wear and therefore has a limited service life or even experiences premature failure.

  Brazil patent application PI 06040993-4 “Pulley with overrun” by the same applicant refers to a pulley with an overrun system by rollers. The pulley uses a plurality of cam surfaces made internally in an outer ring that defines a single portion having the outer shape of the pulley. That is, the latter and the cam surface are made on the same part, presenting the structural device so that the centrifugal force operates with reduced torque overrun due to increased rotation. This structural model is different from the previous model (which uses an assembly of three parts) and prevents the overrunning pulley from being affected by thermal changes in the environment (because assembly interference can change with temperature changes). Ensuring complete torque transmission from the engine to the alternator, i.e. elimination of relative movement between the outer shape of the alternator pulley and the outer ring. Furthermore, this structural model presents a simpler manufacturing process, eliminates machining and mounting steps, and makes the pulleys more rigid and durable. This system is more efficient than the model found in the state of the art and also completes the construction process of other pulleys operating on the same principle.

  Pulleys with overrunning systems by rollers are more efficient, but result in excessive vibrations that wear the assembly due to torsional vibrations generated by the strong acyclism inherent in combustion engines at low revolutions Which results in a reduction in the useful life of the pulley.

(Improvement on the current state of technology)
The focus of the automotive industry is always the search for innovative solutions that can increase the durability and efficiency of components. In keeping with the solutions and needs to the presented problems, overrunning pulleys with elastomeric torsional damping systems have been developed.

  This model presents the same construction principles and advantages as the Brazilian patent application PI0604093-4 by the same applicant, where the cam, the outer ring and the outer shape constituting the overrunning system are formed by a single integral casting. Has the innovation of an elastomeric torsional damping system. In assembly, the two systems meet the most stringent durability requirements, and in the preservation of alternator rotational inertia due to more efficient overruns and more effective damping of the system due to energy absorption by the elastomer. Has higher efficiency.

  If the overrunning system uses a roller associated with the cam to transmit torque in one direction, it is possible to obtain a low overrunning torque. Thus, the rotational inertia of the alternator is stored with greater efficiency when the engine is decelerated. This ensures higher durability of the accessory belt and reduces the ordering of these components. This also avoids the potential noise commonly associated with vehicle speed changes or vehicle switch-off, which is generated by slipping of the belt in sudden speed changes. Since the pulley is more sensitive to absorbing high frequency and low amplitude vibrations, a smaller overrunning torque makes the pulley more efficient in eliminating noise.

  Due to the innovative elastomer damping system and / or due to the cylinder deactivation system, the torsional vibrations generated by the strong acylism inherent in the combustion engine at low revolutions are effectively absorbed and the energy is hysteresis Dissipated by effect. This principle does not cause excessive wear and has excellent results in vibration isolation for all accessories connected to the belt passing through the alternator, and the insulator is much better than that produced by the dissipation of energy by friction. ing.

  For the above reasons, the device herein presents a major evolution for the components that exist on the market today.

  An overrunning pulley according to the present invention comprises a flexible washer, two rollers aligned in parallel, a pulley preferably coupled to an automobile alternator, a roller, an oblong Retaining ring consisting of a central integral cast part with an outer poly-v shape made in a single part, with an outer ring and cam forming an overrun assembly with spring and plastic cage An elastomer torsion damping system, characterized by an elastomer torsion damping system comprising an outer shaft, an elastomer, two cylindrical bushings, and an inner shaft having a keyway insert for a mounting tool; This solves the above problem.

  The overrunning pulley with the elastomeric torsional damping system has different dimensions to adapt to any pulley model and / or mechanical requirements to perform proper isolation of torsional vibrations in the applied dynamic system, It may be made by position and configuration.

  The overrunning pulley with the elastomeric torsional damping system may be characterized by a combination of the elastomeric torsional damping system and a roller and cam overrunning system that operate simultaneously during operation of the pulley.

(Description of device)
The model of the invention consists of a pulley to be connected to the alternator of the car, which in turn is a flexible washer, two rollers aligned in parallel, a washer, a roller, an oval An outer ring and cam that form an overrunning assembly with a spring and plastic cage, and is constituted by a central integral casting that includes an outer shape made in a single piece. The elastomer torsional damping system consists of a retaining ring, a front cylindrical cup with a passage on the central wall and an outer shaft composed of a cylindrical tube, and an external ridge inserted on the cylindrical cup. ) And an elastomer in the form of a ring containing an internal passage, two cylindrical bushings, an outer ridge inserted into the elastomeric element, and a keyway insert for a mounting tool and a cylindrical head on the ring It has one internal shaft made up of tubes.

  The elements that make up the damping system may vary in size, position and configuration to accommodate any pulley model and / or mechanical needs to perform proper isolation of torsional vibrations within the applied dynamic system. Can be created.

(Description of operation)
The model of the invention has its operation from the operation of a vehicle internal combustion engine. When the engine starts operation, a pulley connected to the crankshaft transmits torque from the crankshaft to all the auxiliary machines through the belt. Alternators with greater inertia have a greater impact on the dynamic behavior of the overall system.

  Through the overrunning system with rollers and wedges, during deceleration, the system allows the alternator rotor to rotate freely, thus preserving its rotational inertia.

  When a reduction in motor rotation occurs, the outer part of the pulley actunes to this behavior. The alternator shaft tends to maintain its rotation due to the inertia of the rotor, making its rotation higher than the rotation of the outer portion of the pulley and pulling the overrunning system rollers to a position where there is no torque transmission. As such, the pulley operates on an overrun, allowing the rotational inertia of the alternator to be preserved and provides all the benefits described above in this application.

  During acceleration, the outer part of the pulley tends to gain a rotation greater than the rotation of the alternator shaft, pulling the roller to the locked position, resulting in torque transmission. These rollers are pulled against the outer part of the outer shaft, while the outer shaft is connected to the inner shaft only by the elastomeric element.

  Since the inner shaft is effectively coupled to the alternator, the overall torque transmission is attenuated by the elastomer, either it accelerates or decelerates. This enables torsional vibration isolation, protects the alternator and reduces the transmission of the vibration to the belt, and consequently reduces the transmission of the vibration to all accessories coupled to the belt.

  The elastomer absorbs energy from the excitation of the system due to torsional vibrations and dissipates the torsional vibrations through hysteresis, thus transmitting the excitations with high attenuation. The elements can be used in different dimensions and mechanical properties to ensure a better isolation range of vibration in each applied dynamic system.

  Due to the functional characteristics described above, an overrunning pulley with an elastomeric torsional damping system is composed of a model that provides significant benefits to a vehicle accessory system with an internal combustion engine, and together with torsional vibration damping, In terms of the benefits provided, it provides excellent performance with excellent durability.

  The objects, advantages and other important features of the present invention can be easily understood when read in conjunction with the accompanying drawings.

  The overrunning pulley with elastomeric torsional damping system is aligned in parallel with the flexible washer (A), as shown in the accompanying drawings, which illustrate and integrates the “overrunning pulley with elastomeric torsional damping system” of the present invention. A pulley (1), preferably coupled to an automobile alternator, comprising two rollers (B) and a washer (C), a roller (3A), an elliptical spring (3B) and a plastic cage An outer multi-V shape (2A) made in a single part with an outer ring (2B) and a cam (2C) forming an overrun assembly (3) with (3C) A central integral casting part (2) including a retaining ring (4A), an external shaft (4B), an elastomer (4C), and two A tubular bushing (4D), composed of an elastomeric torsion damping system comprising an inner shaft (4E) having keyway insertion portion for fitting a (4F) (4).

  1 and 2 were made in a single part with a flexible washer (A), two rollers (B), a washer (C), an outer ring (2B) and a cam (2C). A central integral cast part (2) having an external multi-V shape (2A), an overrunning assembly (3) having a roller (3A), an elliptical spring (3B) and a plastic cage (3C), and a retaining ring (4A) ), An elastomeric torsional damping system (4) having an outer shaft (4B), an elastomer (4C), two cylindrical bushings (4D) and an inner shaft (4E) with a keyway insert (4F) for the fitting 1 shows a pulley (1) having

  FIG. 3 shows an inner shaft (2), an elastomer torsional damping system (4), an outer shaft (4B), an elastomer (4C), and a keyway insertion part (4F) of the mounting tool ( 4E) shows the pulley (1).

  FIG. 4 shows an external multiple V made in a single part with a flexible washer (A), two rollers (B), a washer (C), an outer ring (2B) and a cam (2C). A central integral casting (2) having a letter shape (2A), an overrunning assembly (3) having a roller (3A), an elliptical spring (3B) and a plastic cage (3C), a retaining ring (4A), An elastomer torsional damping system (4) having an outer shaft (4B), an elastomer (4C), two cylindrical bushings (4D), and an inner shaft (4E) with a keyway insert (4F) for the fitting. Figure 2 shows a cross-sectional view of the pulley (1), showing a mounted assembly composed of

  FIG. 5 shows a pulley (4) showing an elastomeric torsional damping system (4) having an outer shaft (4B), an elastomer (4C) and an inner shaft (4E) with a keyway insert (4F) for the fitting. The plane sectional view of 1) is shown.

  The model of the present invention is composed of a pulley to be connected to the alternator of the automobile that receives the strong acylism inherent in the combustion engine, and the pulley has the largest inertia among all the auxiliary systems, and is attached to the belt. It has a great influence on the dynamic behavior of all connected accessories. The pulley has a low overrunning torque, resulting in the preservation of the rotational inertia of the alternator, benefiting belt durability, avoiding noise caused by belt slip on the pulley, especially for internal combustion engines Absorbs low-frequency torsional vibrations generated by accyclism. This acylism is even more observed due to the increasing trend of slow engine slowdown and / or the inclusion of cylinder deactivation systems aimed at reducing fuel consumption along with reducing polluting gas emissions. .

  The parts of the assembly can vary in size, shape and material to fit any type of automotive alternator system, but always retain the same features of the present invention.

  In view of the arguments described herein, the product according to the present invention is a highly efficient and economical product with several improvements over the current system, so it is better for assemblers and end consumers. Will be received.

Fig. 3 shows a front development view of an overrunning pulley with an elastomeric torsional damping system. Fig. 5 shows a rear development view of an overrunning pulley having an elastomeric torsional damping system. FIG. 3 shows a perspective view of an overrunning pulley having an elastomeric torsional damping system. FIG. 4 shows a side cross-sectional view of an overrunning pulley having an elastomeric torsional damping system. Figure 2 shows a cross-sectional plan view of an overrunning pulley having an elastomeric torsional damping system.

Claims (3)

A pulley (1) preferably comprising a flexible washer (A), two rollers (B) aligned in parallel, and a washer (C), preferably coupled to an alternator of an automobile;
With outer ring (2B) and cam (2C) forming overrunning assembly (3) with roller (3A), oblong spring (3B) and plastic cage (3C) in a single part Central integral cast part with external multi-V shape (2)
Consisting of
A retaining ring (4A), an outer shaft (4B), an elastomer (4C), two cylindrical bushings (4D), and an inner shaft (4E) having a keyway insert (4F) for a fitting. Featuring an elastomeric torsional damping system (4) comprising:
Overrunning pulley with elastomeric twist damping system.   The elastomeric torsional damping system made with different dimensions, positions and configurations to adapt to any pulley model and / or mechanical requirements to perform proper isolation of torsional vibrations in the applied dynamic system An overrunning pulley having an elastomeric torsional damping system according to claim 1 characterized in that it is characterized in that   2. An overrunning pulley having an elastomeric torsional damping system according to claim 1, characterized by a combination of the elastomeric torsional damping system and a roller and cam overrunning system, both operating simultaneously during pulley operation.