JP2015010654A - Rotational fluctuation absorbing damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotational fluctuation absorbing damper in which one component has a structure to exert a plurality of kinds of functions, thus problems on a large number of components and a heavy weight of a product can be solved.SOLUTION: A damper mass is connected to a hub mounted on a rotating shaft through a damper rubber, and a pulley is connected to the damper mass through a coupling rubber. The damper mass integrally has a bearing holding portion for holding a bearing to the pulley, and a sensing plate portion for detecting a rotating angle of the rotating shaft. Further the damper mass integrally includes a cylindrical portion connected to an outer peripheral side of the damper rubber, a radial portion, an outer peripheral cylindrical portion, and an outward flange portion. The outer peripheral cylindrical portion is applied as the bearing holding portion, and the outward flange portion is applied as the sensing plate portion.

Description

  The present invention relates to a rotational fluctuation absorbing damper having both a dynamic damper function for reducing vibration due to torsional resonance of a rotating shaft and a coupling function for reducing vibration transmission due to torque fluctuation when torque is transmitted from the rotating shaft to another rotating device. . The rotating shaft is, for example, a crankshaft in an automobile engine.

  As shown in FIG. 2, the rotation fluctuation absorbing damper 51 previously proposed by the applicant of the present application connects a damper mass 54 to a hub 52 attached to a rotating shaft via a damper rubber 53 and a coupling rubber 55 to the damper mass 54. Since the damper mass 54 has both a function as a mass in the dynamic damper portion and a function of holding the coupling rubber 55 in the coupling portion, the dead weight is small. It is effective as a structure (see Patent Document 1).

  The rotation fluctuation absorbing damper 51 has a sensing plate 57 for detecting the rotation angle of the rotation shaft. The sensing plate 57 is provided with a large number of detection protrusions 57a on the outer peripheral end thereof, and a sensor reading head (not shown) is axially arranged with respect to the detection protrusions 57a. Placed close to. When the rotating shaft rotates, the detection projection 57a passes in front of the reading head of the sensor, so that a pulse-like detection signal is output, and crank angle detection for engine control is performed.

  However, in the rotational fluctuation absorbing damper 51, the sensing plate 57 is provided as a dedicated part that exhibits only the sensing function, and is directly fitted to the outer periphery of the hub 52, so that it functions as a mass in the dynamic damper portion. The function of holding the coupling rubber 55 and the function of holding the bearing 58 are not exhibited. Therefore, the number of parts is large and the product weight (or dead weight) is large, and there is room for improvement in this respect.

JP 2007-170477 A

  In view of the above points, the present invention provides a rotation fluctuation absorbing damper that has a structure in which one part exhibits a plurality of functions, and that can solve the above-described problems of a large number of parts and a large product weight. The purpose is to provide.

  In order to achieve the above object, a rotational fluctuation absorbing damper according to claim 1 of the present invention connects a damper mass via a damper rubber to a hub attached to a rotary shaft and a pulley via a coupling rubber to the damper mass. A rotation variation absorbing damper with a rubber series structure formed by coupling, wherein the damper mass includes a bearing holding portion that holds a bearing between the pulley and a sensing plate portion for detecting a rotation angle of the rotating shaft. Are integrally formed.

  The rotational fluctuation absorbing damper according to claim 2 of the present invention is the rotational fluctuation absorbing damper according to claim 1, wherein the damper mass is connected to an outer peripheral side of the damper rubber, and the cylindrical part. A radial part integrally formed at the axial end of the outer peripheral part, an outer peripheral cylindrical part integrally formed at the outer peripheral end of the radial part, and an outward flange integrally formed at the axial end of the outer peripheral cylindrical part The cylindrical portion is a connecting portion to the damper rubber, the radial portion is a spacer portion that secures a required radial dimension, the outer peripheral cylindrical portion is the bearing holding portion, and the outward direction The flange portion is the sensing plate portion.

  In the rotational fluctuation absorbing damper of the present invention having the above-described configuration, a rubber series base in which a damper mass is connected to a hub attached to a rotating shaft via a damper rubber and a pulley is connected to the damper mass via a coupling rubber. Under the structure, the damper mass integrally includes a bearing holding portion that holds the bearing between the pulley and a sensing plate portion for detecting the rotation angle of the rotation shaft. It is possible to demonstrate three types of functions: a function as a mass in the dynamic damper part, a function to hold the bearing, and a function to detect the rotation angle of the rotating shaft, while dedicated sensing from the damper. The plate is omitted.

  The shape of the damper mass that exhibits the above three types of functions is not particularly limited. For example, a cylindrical portion connected to the outer peripheral side of the damper rubber, and a radial direction integrally formed at the axial end of the cylindrical portion And an outer peripheral cylindrical portion integrally formed at the outer peripheral end portion of the radial direction portion, and an outward flange portion integrally formed at the axial end portion of the outer peripheral cylindrical portion. In this case, the cylindrical portion is a connecting portion to the damper rubber, the radial direction portion is a spacer portion that secures a required radial dimension, the outer peripheral cylindrical portion is a bearing holding portion, and the outward flange portion is a sensing plate Part.

  The present invention has the following effects.

  That is, in the present invention, as described above, the basic structure of a series of rubbers in which the damper mass is connected to the hub attached to the rotating shaft via the damper rubber and the pulley is connected to the damper mass via the coupling rubber. Since the damper mass has a bearing holding portion and a sensing plate portion integrally, the damper mass has three types of functions including a function as a mass, a function to hold the bearing, and a function to detect the rotation angle of the rotating shaft. Demonstrates and a dedicated sensing plate is omitted. Therefore, the problem that the number of parts is large and the product weight is large can be solved when one part, that is, the damper mass, exhibits a plurality of types, that is, three types of functions as intended.

  In addition, when the damper mass is integrally provided with a cylindrical portion, a radial direction portion, an outer peripheral cylindrical portion, and an outward flange portion, the cylindrical portion functions as a connecting portion for the damper rubber, and the radial direction portion has a required radial dimension. The outer peripheral cylindrical portion functions as a bearing holding portion, and the outward flange portion functions as a sensing plate portion. Therefore, it is possible to provide a damper mass component with high functional efficiency in the meaning that each part does not leak and exhibits each function.

Sectional perspective view of rotation fluctuation absorbing damper according to an embodiment of the present invention Sectional view of a rotational fluctuation absorbing damper according to a conventional example

The present invention includes the following embodiments.
(1) The present invention relates to a crank pulley that prevents belt slip caused by a sudden torque fluctuation when torque is transmitted from a drive shaft in an automobile engine or the like to another rotating device. The present invention is also used in various fields having a torque transmission mechanism using a belt.
(2) In the present invention, the damper mass is used as a strength member that supports the radial bearing of the pulley, and a sensing function is imparted to the damper mass. According to the present invention, it is possible to provide a rotation fluctuation absorbing damper that is light in weight with a small dead weight, low in the number of parts, and inexpensive.
(3) In other words, in the present invention, the sensing plate is disposed on the outer periphery of the damper rubber and used as an inertial mass of the torsional damper. The sensing plate also functions as a strength member that supports the radial bearing of the pulley. Therefore, according to the present invention, it is possible to facilitate the manufacture of a light and inexpensive rotation fluctuation absorbing damper that has less dead weight than the prior art.
(4) In the case of a gasoline engine, the rotational fluctuation absorbing damper is used for an engine with a large rotational fluctuation with a reduced number of cylinders for the purpose of improving fuel efficiency. The torsional amplitude is also extremely small. In the present invention, the sensing portion on the outer periphery of the sensing plate resonates as a damper mass. However, in the case of a small-cylinder engine as described above, the resonance amplitude is a minute amplitude of 1/100 deg. There is no practical problem.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a rotational fluctuation absorbing damper 1 according to an embodiment of the present invention. The rotational fluctuation absorbing damper 1 according to the embodiment has a function as a dynamic damper that reduces vibration due to torsional resonance of a rotating shaft (a driving shaft (for example, a crankshaft of an automobile engine), not shown) and other functions from the rotating shaft. A rotation fluctuation absorbing damper having a function as a coupling that reduces vibration transmission due to torque fluctuation when torque is transmitted to a rotating device, and is configured as follows.

  That is, first, a hub 11 attached to a rotating shaft is provided, a damper mass 14 is connected to the hub 11 via a damper rubber 12, and a pulley 17 is connected to the damper mass 14 via a coupling rubber 16. More specifically, a sleeve 13 is connected to the hub 11 via a damper rubber 12, a damper mass 14 is fitted to the sleeve 13, and an outer sleeve 15 is fitted to the damper mass 14. A pulley 17 is connected to the outer sleeve 15 via a coupling rubber 16. Accordingly, these components (hub 11, damper rubber 12, sleeve 13, damper mass 14, outer sleeve 15, coupling rubber 16 and pulley 17) are connected in series, and both rubbers (damper rubber 12 and coupling rubber 16) are also mutually connected. They are connected in series. A bearing (radial bearing) 18 is interposed between the damper mass 14 and the pulley 17.

  The hub 11 has a boss portion 11a attached to a rotating shaft, and a relatively large-diameter tube toward one axial end of the boss portion 11a in the axial direction (on the front side of the damper, left in the drawing). The shape part 11b is integrally molded.

  The sleeve 13 has a cylindrical shape and is disposed on the outer peripheral side of the cylindrical portion 11 b in the hub 11.

  The damper rubber 12 also has a cylindrical shape, and is disposed between the cylindrical portion 11b and the sleeve 13 in the hub 11. At the same time as the molding, the damper rubber 12 is attached to the outer peripheral surface of the cylindrical portion 11b and the inner peripheral surface of the sleeve 13 ( Vulcanized). Therefore, the hub 11, the damper rubber 12, and the sleeve 13 are molded as an integral molded product. The damper rubber 12 may be of a fitting type that is press-fitted without bonding from one of the axial directions with respect to the radial gap between the cylindrical portion 11 b and the sleeve 13 in the hub 11.

  The damper mass 14 has a cylindrical portion 14a fitted to the outer peripheral surface of the sleeve 13, and radially outward at an end portion on the other axial side (the rear side of the damper, right side in the drawing) of the cylindrical portion 14a. The radial direction portion 14b is integrally molded toward the outer circumferential end portion of the radial direction portion 14b, and the outer circumferential cylindrical portion 14c is integrally molded toward the other axial direction. The outer circumferential cylindrical portion 14c has a diameter at the other axial end portion. An outward flange portion 14d is integrally formed outward in the direction. The cylindrical portion 14 a is a connecting portion 14 A for the damper rubber, the radial direction portion 14 b is a spacer portion 14 B that secures a required radial dimension, and the outer peripheral cylindrical portion 14 c is a bearing that holds the bearing 18 between the pulley 17. The holding portion 14C is used, and the outward flange portion 14d is a sensing plate portion 14D for detecting the rotation angle of the rotating shaft. In addition, a large number of detection projections 14e are provided on the outer peripheral end portion of the outward flange portion 14d serving as the sensing plate portion 14D.

  The outer peripheral sleeve 15 has a cylindrical shape and is fitted to the outer peripheral surface of the cylindrical portion 14 a in the damper mass 14.

  The pulley 17 has a cylindrical portion 17a disposed on the outer peripheral side of the sleeve 13, and an outer peripheral cylindrical portion 17b is integrally formed at the other axial end of the cylindrical portion 17a toward the other axial direction. . The outer peripheral cylindrical portion 17b is disposed on the outer peripheral side of the outer peripheral cylindrical portion 14c in the damper mass 14, and a radial bearing 18 is slidably interposed between the outer peripheral cylindrical portions 14c and 17b. A pulley groove 17c for winding an endless belt for torque transmission is provided on the outer peripheral surface of the pulley body portion 17a.

  The coupling rubber 16 has an annular shape and is disposed between the outer sleeve 15 and the cylindrical portion 17a of the pulley 17, and simultaneously with the molding, the outer peripheral surface of the outer sleeve 15 and the inner periphery of the cylindrical portion 17a of the pulley 17 are arranged. It is attached (vulcanized adhesion) to the surface. Accordingly, the outer sleeve 15, the coupling rubber 16 and the pulley 17 are formed as an integral molded product.

  In each of the above components, the hub 11 and the pulley 17 are each manufactured as a part made of cast iron, and the sleeve 13, the damper mass 14 and the outer sleeve 15 are each manufactured as a part made of sheet metal.

  As described above, the rotational fluctuation absorbing damper 1 configured as described above functions as a dynamic damper that reduces vibration due to torsional resonance of the rotating shaft and transmits vibration due to torque fluctuation when transmitting torque from the rotating shaft to another rotating device. It functions as a coupling that reduces, and is characterized in that the following effects are achieved by the above-described configuration.

  That is, in the rotation fluctuation absorbing damper 1 having the above-described configuration, the sleeve 13 is connected to the hub 11 attached to the rotating shaft via the damper rubber 12, the damper mass 14 is fitted to the sleeve 13, and the outer periphery of the damper mass 14 is The damper mass 14 is a bearing between the pulley 17 and the pulley 17 under the basic configuration in which the side sleeve 15 is fitted and the pulley 17 is connected to the outer sleeve 15 via the coupling rubber 16. Since the bearing holding portion 17C for holding the shaft 18 and the sensing plate portion 17D for detecting the rotation angle of the rotating shaft are integrally provided, the damper mass 14 functions as a mass in the dynamic damper portion, the bearing 18 3 functions consisting of the function of holding the rotation and the function of detecting the rotation angle of the rotating shaftTherefore, since one component, that is, the damper mass 14, exhibits a plurality of types, that is, three types of functions, the above-described problem of a large number of components and a problem of a large product weight can be solved.

  Further, the damper mass 14 is integrally provided with a cylindrical portion 14a, a radial direction portion 14b, an outer peripheral cylindrical portion 14c, and an outward flange portion 14d, and the cylindrical portion 14a functions as a connecting portion 14A for the damper rubber 12, and the radial direction Since the portion 14b functions as a spacer portion 14B that secures a required diameter, the outer peripheral cylindrical portion 14c functions as a bearing holding portion 14C, and the outward flange portion 14d functions as a sensing plate portion 14D, the respective portions 14a, 14b, 14c and 14d perform all functions without leakage. Therefore, the damper mass 14 can be made a functionally efficient component in the sense that each portion 14a, 14b, 14c, 14d does not leak and exhibits each function and there is no portion that does not function.

DESCRIPTION OF SYMBOLS 1 Rotation fluctuation absorption damper 11 Hub 11a Boss part 11b, 14a, 17a Cylindrical part 12 Damper rubber 13 Sleeve 14 Damper mass 14b Radial direction part 14c, 17b Outer peripheral cylinder part 14d Outward flange part 14e Protrusion 14A to be connected 14B Spacer part 14C Bearing holding part 14D Sensing plate part 15 Outer peripheral side sleeve 16 Coupling rubber 17 Pulley 17c Pulley groove 18 Bearing

Claims (2)

A rotation variation absorbing damper of a rubber series structure in which a damper mass is connected to a hub attached to a rotating shaft via a damper rubber and a pulley is connected to the damper mass via a coupling rubber,
The damper variation damper according to claim 1, wherein the damper mass integrally includes a bearing holding portion that holds a bearing between the pulley and a sensing plate portion that detects a rotation angle of the rotating shaft. The rotational fluctuation absorbing damper according to claim 1,
The damper mass is integrally formed at the cylindrical portion connected to the outer peripheral side of the damper rubber, the radial portion integrally formed at the axial end portion of the cylindrical portion, and the outer peripheral end portion of the radial portion. An outer peripheral cylindrical portion, and an outward flange portion integrally formed with the axial end portion of the outer peripheral cylindrical portion,
The cylindrical portion is a connecting portion for the damper rubber, the radial direction portion is a spacer portion that secures a required radial dimension, the outer peripheral cylindrical portion is the bearing holding portion, and the outward flange portion is the sensing member. A rotation fluctuation absorbing damper characterized by being a plate portion.

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