JP2012013115A - Torsional damper and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torsional damper that is reduced in part weight with respect to a sensing mechanism when attaching the sensing mechanism to the inner-mass type torsional damper and achieved in space saving, does not cause breakage and fall-down by resonance with an engine, and does not interfere with a mass body.SOLUTION: The torsional damper includes: a hub having a pulley formed with a pulley groove wound with an endless belt; the mass body arranged at the internal peripheral side of the pulley; and a rubber elastomer connected with the hub and the mass body. The torsional damper also has sensing magnetic rubber having a prescribed circumferential magnetization pattern, and the magnetic rubber is attached to the axial end face or the external periphery of the pulley in the hub.

Description

  The present invention relates to a torsional damper used for absorbing torsional vibration generated in a rotating shaft such as a crankshaft of an engine and a method for manufacturing the torsional damper.

  As shown in FIG. 6 as a type of torsional damper, a hub 52 having a pulley portion 52a provided with a pulley groove 52b around which an endless belt (not shown) is wound is provided. An internal mass type torsional damper in which a rubber-like elastic body 53 and a mass body (mass) 54 are arranged on the inner peripheral side of the portion 52a is known (see Patent Document 1).

  As another conventional technique, as shown in FIG. 7, a damper main body 51 including a hub 52, a rubber-like elastic body 53, and a mass body 54 is provided, and the damper main body 51 is used for sensing the rotational state of the engine. A torsional damper with a sensing mechanism to which a sensor plate 55 is attached is known. The sensor plate 55 is made of a metal ring integrally having a cylindrical portion 55a and a flange portion 55b, and has protruding teeth 55c on a part of the circumference of the outer peripheral edge of the flange portion 55b. 55c is detected by passing the front of a sensor (not shown) during rotation, and the rotational state of the engine is sensed. The sensor plate 55 is fitted to the inner peripheral surface of the outer peripheral cylindrical portion 52c of the hub 52 with the cylindrical portion 55a (see Patent Document 2).

  When the sensor plate 55 of FIG. 7 is attached to the internal mass type torsional damper of FIG. 6, the sensor plate 55 is fitted to the inner peripheral surface of the pulley portion 52a of the hub 52 with the cylindrical portion 55a. However, this combination technique has the following disadvantages.

  That is, since the sensor plate 55 is formed of a metal ring larger than the diameter of the mass body 54 (the pulley portion 52a in the damper of FIG. 6), the sensor plate 55 is heavy and occupies a large space. Further, since the metal sensor plate 55 is similarly fitted to the metal hub 52, the sensor plate 55 may be damaged or dropped due to resonance with the engine.

  Further, when the sensor plate 55 is fitted to the inner peripheral surface of the pulley portion 52a of the hub 52 with the cylindrical portion 55a, the rubber-like elastic body 53 and the mass body are already provided on the inner peripheral side of the pulley portion 52a as described above. 54 is arranged. Accordingly, there is a possibility that the mass body 54 may interfere with the sensor plate 55 as the mass body 54 swings during rotation. In this case, normal operation of the mass body 54 (vibration absorbing operation by sufficient swinging) is performed. There is concern about being disturbed.

JP-A-5-18441 JP2003-148560A (FIGS. 5-6)

  In view of the above points, the present invention reduces the weight of components and saves space when the sensing mechanism is attached to the internal mass type torsional damper as described above. It is an object of the present invention to provide a torsional damper that does not cause breakage or dropout and does not cause interference with a mass body. It is another object of the present invention to provide a method for manufacturing a torsional damper capable of easily manufacturing a torsional damper having such an operational effect.

  In order to achieve the above object, a torsional damper according to claim 1 of the present invention includes a hub including a pulley portion provided with a pulley groove around which an endless belt is wound, and a mass disposed on an inner peripheral side of the pulley portion. A torsional damper having a body and a rubber-like elastic body connected to the hub and the mass body, the magnetic damper for sensing having a predetermined circumferential magnetization pattern, and the magnetic rubber It is attached to the axial end surface or outer peripheral surface of the pulley portion in the hub.

  A torsional damper according to claim 2 of the present invention is the torsional damper according to claim 1, wherein a mounting recess is provided on an axial end surface or outer peripheral surface of the pulley portion of the hub, and the mounting It is characterized in that the magnetic rubber is attached to the recess in a semi-buried or buried state.

  A torsional damper manufacturing method according to claim 3 of the present invention is a method for manufacturing the torsional damper according to claim 1 or 2, wherein the rubber-like elastic body and the magnetic rubber are simultaneously vulcanized. The method includes a step of simultaneously bonding to the hub by molding and a step of applying a predetermined circumferential magnetization pattern to the magnetic rubber after the bonding.

  In the torsional damper of the present invention having the above-described configuration, a hub including a pulley portion provided with a pulley groove around which an endless belt is wound, a mass body disposed on the inner peripheral side of the pulley portion, a hub and a mass body In addition to a damper main body composed of a rubber-like elastic body connected to each other, a magnetic rubber for sensing having a predetermined circumferential magnetization pattern is provided, and this magnetic rubber is used as a damper main body instead of a conventional metal sensor plate. Are attached to the outer peripheral surface or the axial end surface of the pulley portion of the hub. Magnetic rubber is a lightweight and small component compared to a metal sensor plate because it is a rubber, and because it is not a large shape with a cylindrical portion, flange portion and teeth integrally, thus reducing the weight of the component. In addition, it is possible to realize space saving, and at the same time, there is no damage or dropping off due to resonance with the engine, and there is no interference with the mass body.

  In order to attach the magnetic rubber to the hub, the magnetic rubber may be directly attached to the surface of the hub. However, a mounting recess is provided on the hub surface in advance, and the magnetic rubber is semi-embedded or embedded in the mounting recess. In this case, the volume of the magnetic rubber protruding from the surface of the hub is reduced, or the magnetic rubber does not protrude at all from the surface of the hub, so that further space saving is realized. Further, if the structure is such that the magnetic rubber is attached to the mounting recess, the magnetic rubber is held by the mounting recess, so that the magnetic rubber is accurately positioned and the magnetic rubber is tilted, misaligned, or dropped off. Less likely to occur.

Also, in order to attach the magnetic rubber to the hub, there are a structure in which the magnetic rubber is directly vulcanized and bonded to the hub, and a structure in which the magnetic rubber is molded as a single unit and then attached to the hub later. However, when the former magnetic rubber is directly vulcanized and bonded to the hub, the rubber-like elastic body of the damper main body may be vulcanized and bonded to the hub in parallel. That is, in the damper body, as a structure in which the mass body is connected to the hub via the rubber-like elastic body, that is, a structure in which the rubber-like elastic body is interposed between the hub and the mass body,
(1) A rubber-like elastic body molded in advance alone is pressed between the hub and the mass body.
(2) A rubber-like elastic body is vulcanized and molded between the hub and the mass body to form an integral vulcanized molded product by these three members.
(3) A rubber-like elastic body is vulcanized and molded between the hub and the sleeve to form a bush body formed by these three members. ) A rubber-like elastic body is vulcanized between the mass body and the sleeve to form a bush body of these three members, and this bush body is fitted to the hub with the sleeve.
However, in cases (2) and (3), a rubber-like elastic body is vulcanized and bonded to the hub, and at the same time, magnetic rubber is added to the hub as described above. Sulfur bonded. Therefore, in this case, it is preferable that the rubber-like elastic body and the magnetic rubber are simultaneously bonded to the hub by simultaneous vulcanization molding with the hub inserted in the mold. According to this, the same one hub is to be bonded. As a result, it is possible to avoid the trouble of twice that the vulcanization bonding process must be performed twice. In this case, after the magnetic rubber is bonded to the hub through the above steps, a step of applying a predetermined circumferential magnetization pattern to the magnetic rubber is performed.

  The present invention has the following effects.

  That is, in the torsional damper of the present invention, a hub provided with a pulley portion provided with a pulley groove around which an endless belt is wound, a mass body arranged on the inner peripheral side of the pulley portion, and the hub and the mass body are connected. In addition to the damper body made of a rubber elastic body, a sensing magnetic rubber having a predetermined circumferential magnetization pattern is provided, and this magnetic rubber is used as a hub of the damper body in place of the conventional metal sensor plate. Are attached to the outer peripheral surface or the axial end surface of the pulley portion. Magnetic rubber is a lightweight and small component compared to a metal sensor plate. Therefore, in the internal mass type torsional damper equipped with a sensing mechanism, the weight of the parts can be reduced and the space can be saved according to the intended purpose. Interference can be suppressed. Further, according to the structure in which the mounting concave portion is provided in the hub and the magnetic rubber is attached to the mounting concave portion, further space saving is realized, and the magnetic rubber is not easily tilted, displaced, or dropped off. Further, as a manufacturing procedure, when the rubber-like elastic body and the magnetic rubber are simultaneously bonded to the hub by simultaneous vulcanization molding, it is possible to save twice the work in the vulcanization bonding process.

Sectional sectional view of the torsional damper according to the first embodiment of the present invention Sectional sectional view of a torsional damper according to a second embodiment of the present invention Sectional sectional view of a torsional damper according to a third embodiment of the present invention Sectional sectional view of a torsional damper according to a fourth embodiment of the present invention Sectional sectional view of a torsional damper according to a fifth embodiment of the present invention Half-sectional view of a torsional damper according to a conventional example (A) is a half cut sectional view of a torsional damper according to another conventional example, and (B) is a view in the direction of arrow B in (A).

  The present invention includes the following embodiments.

(1) In the conventional torsional damper, when the sensor part for detecting the crank angle of the crankshaft is provided in the torsional damper, it is necessary to fit a metal punched plate to the hub part, which increases the number of parts. There was a problem such as an increase in mass accompanying damage and breakage or dropout due to resonance of the plate with the engine.
(2) In order to solve the above problem, the following configuration is adopted.
(2-1) A hub pulley shape in which a groove for driving a belt is provided on the hub side.
(2-2) A recess is provided on the outer peripheral side (or end surface portion) of the hub pulley, and magnetic rubber that can be magnetized is vulcanized and bonded to the recess.
(2-3) A vibration ring is provided inside the hub and vulcanized and bonded with a damper rubber.
(2-4) The damper rubber is an elastic body having a vibration isolating function.
(2-5) Two-material simultaneous vulcanization adhesion is performed for magnetic rubber and damper rubber.
(2-6) Magnetize the magnetic rubber after product assembly to provide a sensor function.
(3) With the above configuration, the following effects can be obtained.
(3-1) A plate made of a metal plate is made of magnetic rubber installed on the outer peripheral portion, so that the plate becomes unnecessary and the product weight is reduced.
(3-2) By simultaneously vulcanizing and bonding the magnetic rubber and the damper rubber, the rubber part vulcanizing and bonding step of the outer peripheral portion can be performed at a time. Magnetic rubber is difficult to use as a damper rubber from the viewpoint of durability, and the damper rubber and magnetic rubber need to be made of different materials. Therefore, by making the vibration ring of the torsional damper into an internal mass and using a vulcanized adhesive type, magnetic rubber and damper rubber can be molded in a single vulcanization process, thereby reducing the number of manufacturing steps. In addition, the plate fitting process can be eliminated, and the number of processing steps can be reduced.
(3-3) Unlike the fitting of the plate, since the magnetic rubber is vulcanized and bonded, there is no fear of dropping off.
(3-4) By using magnetic rubber, more detailed detection is possible compared to a metal plate (magnetic rubber is, for example, Max 0.04 deg, and metal plate is, for example, Max 0.12 deg).
(3-5) Since magnetization is performed after assembly, there is no mounting error during assembly and the accuracy is higher than that of the plate.

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

First embodiment ...
FIG. 1 shows a torsional damper 1 according to a first embodiment of the present invention, and the torsional damper 1 according to this embodiment is configured as follows.

  That is, as shown in FIG. 1, the torsional damper 1 includes a hub having a pulley portion 12c provided with a pulley groove 12d around which an endless belt (not shown) is wound to transmit rotational torque to various auxiliary machines. 12, a damper body 11 including a mass body 13 arranged on the inner peripheral side of the pulley portion 12 c, a rubber-like elastic body 14 connecting the hub 12 and the mass body 13, and a predetermined circumferential magnetization pattern A magnetic rubber 21 for sensing is provided, and the magnetic rubber 21 is attached to the axial end surface portion of the pulley portion 12 c of the hub 12. Each component is configured as follows.

  That is, first, the hub 12 is formed in an annular shape from a predetermined metal material, and a boss portion (inner peripheral cylinder portion) 12a for fixing the hub 12 to a shaft (not shown), and a radial rising portion. 12b and a pulley portion (outer peripheral cylinder portion) 12c having a pulley groove 12d for winding an endless belt provided on the outer peripheral surface are integrally provided. Further, an annular mounting recess 12e having a step shape is provided on the end surface in the axial direction on the engine side (right side in the drawing) of the pulley portion 12c, and the annular magnetic rubber 21 is similarly mounted on the mounting recess 12e. As the mounting recess 12e, a stepped shape having a side wall in one side in the width direction (vertical direction in the figure) is drawn, but in addition, a groove shape having side walls in both the width direction may be used. .

  The mass body 13 is formed in a ring shape from a predetermined metal material, and is disposed concentrically on the inner peripheral side of the pulley portion 12c of the hub 12 with a predetermined radial interval. The mass body 13 may be referred to as an inertia mass body, a mass, or a vibration ring.

  The rubber-like elastic body 14 is formed in an annular shape from a predetermined rubber-like elastic material, and is formed between the axial end face on the engine side in the mass body 13 and the end face of the radial rising portion 12b of the hub 12 facing this. Vulcanized and bonded, and the mass body 13 and the hub 12 are connected via the rubber-like elastic body 14. In addition, this rubber-like elastic body 14 may be called a damper rubber.

  The magnetic rubber 21 is formed in an annular shape from a predetermined rubber-like elastic material mixed with magnetic powder, and is attached to the mounting recess 12e provided on the axial end surface of the pulley portion 12c of the hub 12 as described above. . The cross-sectional shape of the magnetic rubber 21 is also a rectangular shape that is long in the radial direction as the cross-sectional shape of the mounting recess 12e is a rectangular shape that is long in the radial direction. Is formed in a square ring shape, and an axial end surface on the engine side that forms a plane perpendicular to the axis is a detected surface in sensing. The axial width dimension (thickness dimension, for example, 2 mm or less) of the magnetic rubber 21 is set to be substantially the same as the axial width dimension (depth dimension) of the mounting recess 12e, and the radial width dimension of the magnetic rubber 21 is also the mounting recess. It is set to be substantially the same as the radial width dimension of 12e. Accordingly, the magnetic rubber 21 is attached in a state of being embedded in the attachment recess 12e.

  Further, the magnetic rubber 21 has a magnetic encoder structure in which a number of N poles and S poles are alternately formed at a predetermined pitch on the circumference as a circumferentially magnetized pattern, and a magnetic sensor 31 as shown in the figure. In combination with this, sensing such as engine rotation detection and crank angle detection is performed.

  In the torsional damper 1 having the above-described configuration, the hub 12 including the pulley portion 12c provided with the pulley groove 12d for winding the endless belt, the mass body 13 disposed on the inner peripheral side of the pulley portion 12c, In addition to the inner mass type damper body 11 composed of a rubber-like elastic body 14 connected to the hub 12 and the mass body 13, a magnetic rubber 21 for sensing having a predetermined circumferential magnetization pattern is provided. A rubber 21 is attached to the axial end surface of the pulley portion 12c of the hub 12 of the damper main body 11 in place of the conventional metal sensor plate. As described above, the magnetic rubber 21 is a lighter and smaller component than the metal sensor plate. Therefore, the weight of the component can be reduced and the space can be saved as compared with the conventional case, and at the same time, the resonance with the engine does not cause breakage or dropout and the interference with the mass body 13 does not occur.

  Further, an annular mounting recess 12e having a step shape is provided on the axial end surface on the engine side of the pulley portion 12c of the hub 12, and the annular magnetic rubber 21 is similarly embedded in the mounting recess 12e. Therefore, further space saving is realized as compared with the case where a part or all of the magnetic rubber 21 protrudes from the surface of the hub 12. Further, since the mounting position of the magnetic rubber 21 is defined by the mounting recess 12e, the mounting position accuracy can be improved. Since the magnetic rubber 21 is held by the mounting recess 12e, the magnetic rubber 21 is inclined and positioned. Misalignment or dropout is unlikely to occur.

  Next, the manufacturing method of the torsional damper 1 will be described. The damper 1 is manufactured by the following procedure.

  That is, first, the hub 12 and the mass body 13 are each manufactured in a part shape. Next, the hub 12 and the mass body 13 are inserted into a mold, and in this inserted state, the rubber-like elastic body 14 and the magnetic rubber 21 are simultaneously vulcanized and molded using the mold and are simultaneously bonded to the hub 12. . Therefore, the mold is provided with a cavity space for molding the rubber-like elastic body 14 and a cavity space for molding the magnetic rubber 21, and these are filled with different materials. Next, after releasing, a predetermined circumferential magnetization pattern is applied to the magnetic rubber 21.

  Therefore, according to the above manufacturing method, as described in detail above, it is possible to save twice the work in the rubber vulcanization bonding process.

  In addition, about the said torsional damper 1, it is possible to add and change the structure as follows.

Second embodiment ...
In the first embodiment, the magnetic rubber 21 is attached to the axial end surface of the pulley portion 12c in the hub 12. Alternatively, the magnetic rubber 21 may be attached to the outer peripheral surface of the pulley portion 12c in the hub 12. good.

  That is, in FIG. 2 shown as the second embodiment, an annular mounting recess 12e is provided on the outer peripheral surface of the pulley portion 12c of the hub 12, and the annular magnetic rubber 21 is similarly mounted on the mounting recess 12e. The mounting recess 12e is disposed on the engine side of a pulley groove 12d provided on the outer peripheral surface of the pulley 12c in the hub 12.

  In this case, the cross-sectional shape of the magnetic rubber 21 is also a rectangle (rectangle) that is long in the axial direction as the cross-sectional shape of the mounting recess 12e is a rectangle (rectangle) that is long in the axial direction. The magnetic rubber 21 is formed in a square ring shape, and an outer peripheral surface forming a cylindrical surface thereof is a detection target surface in sensing. The radial width dimension (thickness dimension) of the magnetic rubber 21 is set to be substantially the same as the radial width dimension (depth dimension) of the mounting recess 12e, and the axial width dimension of the magnetic rubber 21 is also the axis of the mounting recess 12e. The magnetic rubber 21 is attached in a state of being embedded in the attachment recess 12e.

  In the first and second embodiments, the magnetic rubber 21 is attached in a state of being embedded in the mounting recess 12e. Instead, the magnetic rubber 21 is mounted in a state of being semi-buried in the mounting recess 12e. In this case, the thickness of the magnetic rubber 21 is set to be larger than the depth of the mounting recess 12e, and a part of the magnetic rubber 21 protrudes from the surface of the hub 12.

Third and fourth embodiments ...
Further, the mounting recess 12e may be omitted, and the magnetic rubber 21 may be directly mounted on the surface of the hub 12. In FIG. 3 shown as the third embodiment, the magnetic rubber 21 is in the axial direction of the pulley portion 12c in the hub 12. In FIG. 4 shown as the fourth embodiment, the magnetic rubber 21 is directly attached to the outer peripheral surface of the pulley portion 12 c in the hub 12.

Fifth Example ...
Further, regarding the configuration of the inner mass type damper main body 11, in each of the above-described embodiments, the rubber-like elastic body 14 has an axial end surface on the engine side in the mass body 13 and an end surface of the radial rising portion 12 b of the hub 12 facing this. The mass body 13 and the rubber-like elastic body 14 are arranged in the axial direction by being vulcanized and bonded to each other, but instead of this, as shown in FIG. The mass body 13 and the rubber-like elastic body 14 may be arranged in the radial direction by vulcanizing and bonding between the surface and the inner peripheral surface of the pulley portion 12c of the hub 12 facing the surface. In the invention, the configuration of the inner mass type damper main body 11 is not limited in any way, and it is only necessary that the mass body 13 and the rubber-like elastic body 14 be arranged on the inner peripheral side of the pulley portion 12c.

  Other configurations and operational effects of the second to fifth embodiments are the same as those of the first embodiment. Accordingly, the same reference numerals are given and description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Torsional damper 11 Damper main body 12 Hub 12a Boss part 12b Radial direction rising part 12c Pulley part 12d Pulley groove 12e Mounting recessed part 13 Mass body 14 Rubber-like elastic body 21 Magnetic rubber 31 Sensor

Claims (3)

A hub having a pulley portion provided with a pulley groove around which an endless belt is wound, a mass body arranged on an inner peripheral side of the pulley portion, and a rubber-like elastic body connecting the hub and the mass body A torsional damper,
It has a magnetic rubber for sensing with a predetermined circumferential magnetization pattern,
A torsional damper, wherein the magnetic rubber is attached to an axial end surface or an outer peripheral surface of the pulley portion of the hub. The torsional damper according to claim 1,
A torsional damper characterized in that a mounting recess is provided on an axial end surface or outer peripheral surface of the pulley portion in the hub, and the magnetic rubber is mounted in the mounting recess in a semi-embedded or embedded state. A method for manufacturing the torsional damper according to claim 1 or 2,
Simultaneously bonding the rubber-like elastic body and the magnetic rubber to the hub by simultaneous vulcanization molding;
And a step of applying a predetermined circumferential magnetization pattern to the magnetic rubber after the bonding.

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