JPH02502303A - Torsional vibration isolation device and method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Torsional vibration isolation device and method Field and background of the invention The present invention relates to multi-cylinder internal combustion engines, and in particular to crankshafts and flywheels. A multi-series system with a device to protect rotary equipment from stresses induced by torsional vibrations. regarding internal combustion engines.

Moment of inertia of the crankshaft and flywheel of a multi-cylinder internal combustion engine rotation with a natural or resonant frequency of torsional vibration due to the It has been a long time since it was recognized that they form a system. Result of engine cylinder ignition , the pulsating force applied to the crankshaft induces such torsional vibration, and at a certain rotational speed. The crankshaft also generates force.

Important References in the Field of the Invention (Port, Oregon, August 6-9, 1979) RObsrt O, Bremer, at the West Coast International Conference in Tolland Jr. Submission B, 1.1! ,, as falsely shown in the paper sp-445), the book The usual approach when dealing with torsional vibrations and stresses in the field of invention is to Analyze the link shaft/7raiwheel system as if it were a simple torsional oscillator. Is Rukoto. In this approach to analysis, the moment of inertia of the component is The pins are redisassembled around the crankbin closest to the flywheel, and the system It is as if it is a spring that connects the part of the crankshaft in front of the bottle with the 7rai wheel. They are treated like animals. In that case, this system determines the natural frequency of its torsional vibrations two masses connected by an elastic connector (bin) with a torsional spring rate of (crankshaft and flywheel). In that case, this The system consists of harmonic frequencies that fall within the operating range of the engine (in revolutions per minute), and v combines with other frequencies in such a way that it creates stress and is possibly destructive. The I4 sum frequency is determined and analyzed. Since such frequencies are discovered, the damper is used to dampen or reduce vibrations by dissipating energy. It is designed to be mounted on the end of the crankshaft farthest from the eel.

Although these approaches have met with some success, the technology has not yet been adopted. have a wide range of operating speeds, as evidenced by commercially available engines and wheels, and therefore In an effort to apply this technology to engines that encounter a wide range of potentially dangerous operating conditions, I have experienced great difficulties.

Detailed description of the invention With the above facts in mind, it is an object of the present invention to develop a flywheel with consideration to torsional vibration. Rotating crankshaft/fly by effectively isolating the eel from the crankshaft The aim is to avoid the destructive stress of torsional vibrations in the wheel system.

In realizing the objectives of the invention, the flywheel and crankshaft are The angular movement of w4ail, the torsion spring rate of the conventional crankshaft/7raiwheel system The connection is by an elastic coupling device with a relatively low torsional spring rate.

Still another object of the present invention is to have a crankshaft/7-wheel system as described above. The probability that stress will cause damage to the engine is calculated in terms of revolutions per minute. Reduces the natural frequency of torsional vibration of the system to a frequency much lower than the normal operating range. By doing so, we aim to reduce it. In achieving this object of the invention, the above The crankshaft and flywheel can be separated by the joint shown below, and this joint torsion within the normal operating range of the engine by selecting a spring rate for The frequency can be chosen to substantially eliminate the effects of vibration.

Brief description of the drawing Although some of the objects of the present invention have been described above, other objects can be understood with reference to the attached contents. This will become clearer as the explanation progresses.

The first figure is a front view of the components of a multi-cylinder internal combustion engine showing the present invention, and the second figure is the first figure. FIG. 3 is an enlarged front view of the coupling element used in the device shown in FIG. FIG. 4 is an enlarged front view showing some of the first component in cross section.

Detailed description of the invention The invention will be described in more detail below with reference to the accompanying drawings, which illustrate preferred embodiments thereof. However, art engineers can modify the present invention described herein to obtain further preferable invention results. In the following explanation, it should first be understood that the following can be obtained. Therefore, the following explanation As a comprehensive teaching for industrial engineers and not limited to the present invention, I want to be understood.

Now, to elaborate further on the attached diagram, a multi-cylinder internal combustion engine As mechanical engineers know, an engine has a number of elements that work together to make it work. It is growing.

In order to simplify the diagram, only a few elements are shown or suggested and for clarity purposes only a few elements are shown or suggested. It is up to the engineer's knowledge to understand the simplifications made. For the present invention The important elements are the crankshaft, indicated as a whole by numeral 10 in Fig. 1, and the crankshaft, indicated as a whole by numeral 11. This is the flywheel shown. Traditionally, the flywheel was used as a clutch, transmission device, and a belt-driven quarter pump near the starter (none of which are shown). It is mounted on the end of the crankshaft far from accessories such as the engine and fans.

High performance used in many conventional engines, especially racing cars, ships and aircraft In an engine, the flywheel connects the engine to the starter and clutch. It serves little useful purpose beyond making a difference. Regarding the production of inertial mass, The more conventional reasons for having a lie wheel are completely irrelevant. However, inertia Problems caused by the presence of quantities, especially regarding the effects of torsional vibrations, remain. moreover , the known above approaches that rely on the use of dampers to absorb energy It is impossible to avoid major engine failures. The present invention is applicable to such fields. We provide an alternative to the above that is not only successful but also highly versatile.

More specifically, it has a rotating crankshaft 10 and a rotating flywheel 11. In a multi-cylinder internal combustion engine, the improvement of the present invention is applicable to the crankshaft 10 and the 7 life wheel. 11 to rotate the flywheel together with the crankshaft. The entire valve housing between the shaft 10 and the flywheel 11 (Figures 82 to 4) is marked. By providing the elastic joint device shown in No. 12, stress caused by torsional vibration can be reduced. makes it easier to avoid destructive effects on the crankshaft.

According to an important feature of the present invention, the elastic joint device is clamped to account for torsional vibrations. It has a low torsional spring rate that is effective in isolating the flywheel from the rotational inertia of the shaft. do. In particular, the coupling device is operably disposed between the crankshaft and the seven-wheel. Natural vibration of torsional vibration of the rotating device limited by the rekatsu crankshaft and 7-wheel an elastic material having a low torsional spring rate effective to reduce the number of vibrations to a predetermined low frequency; Preferably, it takes the form of a ring made of elastomer such as rubber. A work of this invention In a dynamic embodiment, this ring of elastic material has a diameter of 200001n-1b/radian. Rotating equipment limited by the crankshaft and flywheel with the following torsion spring rate: It has the effect of reducing the natural frequency of torsional vibration of the machine to a frequency of 50 degrees or less.

To achieve the connection between the crankshaft and flywheel, the crankshaft and flywheel The wheel is equipped with a device that enables the connection of the two and adjusts the relative rotation between the two. I'm being kicked. The crankshaft 10 limits the drive 7 flange 14 and the bearing surface 15. The flywheel 11 engages with the bearing surface of the crankshaft. It has a device for defining the bearing 16 for this purpose. Crankshaft 10 and flap Both of the wheels 11 have a large number of lugs, and the crankshaft has a rotation axis of the crankshaft. The flywheel has a number of drive lugs 18 extending from the drive 7 langes in predetermined positions surrounding the flywheel. The eel extends from the flywheel to a predetermined position surrounding the axis of rotation of the flywheel. It has a large number of driven lugs 19. The ring of elastic material connects the bearing surface 15 and the bearing The drive wheel 16 is surrounded by a drive wheel 14 and a drive wheel 11. Ringma or the coupling device 12 is a multi-piece sized to fit snugly into the lugs 18.19. having an opening or hole. Therefore, the bearing surface and the bearing and coupling device 1 The flywheel and crankshaft are connected to each other by the elastic connection created by 2. On one side in a driving relationship, there is a substantial distance between the two against the spring force of the coupling device. Allows relative rotation of degrees.

In terms of operation, the starter engages with the 7-line wheel to turn the engine on. Sufficient stiffness to regulate engine starting and transfer of drive power to load . However, since the coupling device has sufficient elasticity, it is difficult to use rotating equipment in consideration of torsional vibration. In the analysis of the position, the inertial mass considered as the entire crankshaft is the entire flywheel. The inertial mass considered as having a significantly lower torsional spring rate than the conventional case The argument is that they are connected through their constituent elements.

Therefore, the natural frequency of torsional vibration is the inertial modulus of the two masses: the torsional oscillator and the spring rate. This is a well-known factor in the (The product of the sum of the moments of inertia multiplied by the spring rate is divided by the product of the moments of inertia.) is equal to the square root of the value determined by ), so it is natural to reduce the bounce rate. reduce the natural frequency to a range below the engine operating range. effectively accomplish the following. For example, the natural frequency below 50H2 is 3000rp m, which corresponds to an engine speed of less than operating speed or less.

Conversely, the ability to control the natural frequency of the crankshaft/flywheel system is Opens up the possibility of adapting the teachings of the invention to engines of size and range.

In terms of use, the flywheel is attached to the crankshaft to account for torsional vibrations. By isolating it from the Rotation with respect to the depending on the force applied and the specific spring constant used, in such a way that only a few positions are required. , is possible. In the present invention, such a biasing motion is realized when the rotating system according to the present invention Ensure adequate protection from the adverse effects of torsional vibration that may otherwise occur. It is advantageous as evidence and is not considered disadvantageous.

Preferred embodiments of the invention have been described in the drawings and specification. However, specific terms used in the explanation, but the terms used in the explanation are to be used only in a general descriptive sense. It is not intended to be limiting.

international search report I-Fuichi-＾Hoko City Low”v PCT/1ls8610178fu1m#’m1 16MIAl1m<AboIITla, PCT/US861017B?

Claims (14)

[Claims] 1. For multi-cylinder internal combustion engines with rotating crankshafts and rotating flywheels. the crankshaft and the flywheel to rotate the crankshaft and the flywheel. It consists of an elastic joint device interposed between the two to connect and integrate the wheel. The coupling device prevents torsional vibrations from being transferred between the flywheel and the crankshaft. In order to avoid damping while stopping the engine, the rotational inertia of the flywheel is reduced after the engine starts. between the flywheel and the crankshaft to isolate it from the rotational inertia of the crankshaft. torsional vibration with a low torsional spring rate effective to allow qualitative angular displacement. It is characterized by making it easier to avoid the destructive action of stress induced on the crankshaft. A multi-cylinder internal combustion engine. 2. For multi-shilling internal combustion engines with rotating crankshafts and rotating flywheels. the crankshaft and the flywheel to rotate the crankshaft and the flywheel. In order to connect and integrate the wheels, an elastic joint device is interposed between the two, and the joint The hand device prevents vibrations from being transferred between the flywheel and the crankshaft. Torsional vibrations of rotating equipment limited by the crankshaft and flywheel The engine is designed to avoid damping while reducing the natural frequency of the engine to a predetermined low frequency. After starting, a flap is installed to isolate the rotational inertia of the flywheel from the rotational inertia of the crankshaft. The low torsion that is effective in allowing substantial angular displacement between the liewheel and the crankshaft is The stress induced by torsional vibration that has a modulus of elasticity is exerted on the crankshaft. A multi-cylinder internal combustion engine characterized by easy avoidance of destructive action. 3. The crankshaft and flywheel are both subject to torsional vibration in a rotating inertial system. and the coupling device is operable between the crankshaft and the flywheel. A ring made of elastic material is inserted to connect the crankshaft and flywheel together. A multi-cylinder internal combustion engine according to any one of claims 1 and 2. 4. the crankshaft has a device defining a drive flange and a bearing surface; This wheel engages with the bearing surface of the crankshaft, so it is equipped with a device that limits the bearing. The elastic ring has a bearing surface and a drive flange surrounding the bearing surface and the bearing surface. A multi-series structure according to claim 1, which is closed by a cage and a flywheel. Linda internal combustion engine. 5. The rotation axis of the crankshaft is removed so that the crankshaft engages the ring of elastic material. The flywheel has a number of drive lugs extending from the drive flange in position to wind the flywheel. a predetermined position around the axis of rotation of the flywheel for engagement with said ring of elastic material; Claim 4, further comprising a number of driven lugs extending from the flywheel at each location. multi-cylinder internal combustion engine. 6. 5. The polyurethane according to claim 4, wherein the ring of elastic material is made of an elastomeric material. Cylinder internal combustion engine. 7. The ring of elastic material can resist torsion of less than 20,000 in-lb/radian. 7. A multi-cylinder internal combustion engine according to claim 6, having a 8. The ring of elastic material is connected to a rotating device defined by a crankshaft and a flywheel. Effective for reducing the natural frequency of torsional vibration to a predetermined low frequency of 50Hz or less A multi-cylinder internal combustion engine according to claim 2. 9. It has a rotating crankshaft and a rotating flywheel, which together vibrate. In multi-cylinder internal combustion engines that form a rotational inertia system that is susceptible to and the drive flange at a predetermined location surrounding the bearing surface and the axis of rotation of the crankshaft. a crankshaft having a device for defining a number of drive lugs extending from the crankshaft; A predetermined position surrounding the axis of rotation of the bearing and flywheel that engages the bearing surface. a number of driven lugs extending from the flywheel; a flywheel, operably interposed between the crankshaft and the flywheel; The crankshaft and flywheel are connected to rotate the flywheel together with the crankshaft. an elastomer that engages with the drive and driven lugs to connect and integrate the wheels; a ring of elastomeric material, the ring of elastomer material having a diameter of 20,000 in-lb/rad. limited by the crankshaft and flywheel with a torsional spring rate of less than Reduce the natural frequency of torsional vibration of rotating equipment to a predetermined low frequency of 50Hz or less The stresses induced by torsional vibrations are effective to A multi-cylinder internal combustion engine characterized by making it easier to avoid destructive effects on the engine. 10. The process of attaching the flywheel to the crankshaft for rotation and torsional vibration. The rotational inertia of the flywheel is separated from the rotational inertia of the crankshaft in order to take into account the The crankshaft and flywheel rotate together with the crankshaft while the flywheel rotates with the crankshaft. The process of connecting the crankshaft and flywheel with a joint that connects the eels together; Due to the destructive action of stress induced by torsional vibration on the crankshaft, Components of a multi-cylinder internal combustion engine with a crankshaft and a rotating flywheel How to protect. 11. The process of attaching the flywheel for rotation to the crankshaft and the crank Torsional vibration nature of rotating equipment limited by shafts, couplings and flywheels The flywheel is rotated with the crankshaft while reducing the vibration frequency to a predetermined low frequency. A joint that connects the crankshaft and flywheel together in order to The stress induced by torsional vibration caused by the process of connecting the flywheel to the flywheel is It has a rotating crankshaft and a rotating flywheel because of the destructive effect it has on the crankshaft. A method for protecting components of a multi-cylinder internal combustion engine. 12. The process of connecting the crankshaft and flywheel is made using elastic elastomer. The method of claims 10 and 11 consisting of choosing a joint that is a ring of material. The method described in any of the following. 13. The selection process of the joint further includes a joint selection process of 20,000 in-lb/radian or less. As claimed in claim 12, the method comprises selecting a ring of elastic material having a torsional resiliency. How to put it on. 14. The coupling selection process is further limited by the crankshaft and flywheel. The natural frequency of the torsional vibration of the rotating equipment is set to a predetermined low frequency of 50Hz or less. as claimed in claim 12, comprising selecting a ring of elastic material effective to reduce the How to put it on.