JP2006207751A - Torsional damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torsional damper in an advantageous form of preventing of the pull of a mass body out of an inner cylinder fitting to one axial side. <P>SOLUTION: The inner cylinder fitting 12, which is fixed to a predetermined rotating shaft, and an outer cylinder fitting 14, which is concentrically arranged apart from the inner cylinder fitting 12 in the radial direction and into the outer peripheral face of which the mass body 18 pressed, are elastically connected to each other with a rubber elastic body 16. A lightening void 38 is provided extending through the rubber elastic body 16 to the axial direction. Between the outer peripheral face of the inner cylinder fitting 12 located corresponding to an area where the lightening void 38 of the rubber elastic body 16 is formed and the inner peripheral face of the outer cylinder fitting 14, stopper means 28, 36 are formed for restricting the displacement of the outer cylinder fitting 14 to one axial side to prevent the pull of the outer cylinder fitting 14 out of the inner cylinder fitting 12 to one axial side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a torsional damper, and more particularly to a torsional damper in which a cylindrical or annular mass body is elastically connected via a rubber elastic body to an inner cylinder fitting fixed to a rotating shaft. It relates to an improved structure.

  As is well known, the torsional damper as described above includes a so-called press-fit type and a vulcanized adhesive type. In other words, the former is a method in which a rubber elastic body is press-fitted from one side in the axial direction between the inner cylindrical metal fitting and a mass body that is concentrically spaced apart from the radially outer side thereof. The cylindrical metal fitting and the mass body are integrally assembled. In the latter case, the inner cylindrical metal fitting and the mass body are vulcanized and bonded by a rubber elastic body interposed therebetween. Thus, it has a structure that is elastically connected.

  By the way, in such a torsional damper, when the rubber elastic body is broken due to fatigue or the like and the mass body is pulled out from the inner cylinder fitting, the mass body is rotated to fix the inner cylinder fitting. There is a risk of damaging the shaft, another rotating shaft connected to the shaft, or a member or component disposed around the shaft. In particular, when the torsional damper is fixed to the rotating shaft of a differential mechanism connected to a propeller shaft of an automobile, for example, the mass body that has come out of the inner cylindrical metal fitting comes into contact with the propeller shaft, and the propeller shaft Damage can cause very serious damage to the car.

  Under such circumstances, for example, in the following Patent Document 1 and the like, in the vulcanization adhesion type torsional damper described above, the mass body is pulled out to one side in the axial direction with respect to the inner cylindrical metal fitting due to breakage of the rubber elastic body or the like. A structure that can be prevented beforehand has been proposed.

  That is, as one structure, an outer flange projecting radially outward is provided at one end in the axial direction of the inner cylindrical metal fitting, and the outer flange is provided with a rubber elastic body at its distal end. The structure which is made to oppose the end surface of the axial direction one side of the cyclic | annular mass body connected with the inner cylinder metal fitting through this is clarified (refer FIG.1 and FIG.2 of the following patent document 1). According to such a structure, when the annular mass body is displaced to the one side in the axial direction, the end face on the one side in the axial direction of the annular mass body is engaged with the distal end portion of the outer flange in the inner cylindrical metal fitting. Thus, the outer flange functions as a stopper, and further displacement of the annular mass body in the axial direction on one side is restricted, so that the annular mass body is prevented from being pulled out in the axial direction on the one side. It is like that.

  As another structure, between the inner cylinder fitting and the annular mass body, a plurality of spaces in the circumferential direction are provided so as to extend in the axial direction without any rubber elastic body, and the formation of each of these spaces A stopper pin extending outward in the radial direction protrudes from the inner cylindrical metal part corresponding to the part, and each stopper pin is inserted into the annular mass part corresponding to the formation part of each cavity. A structure in which the through-holes are provided is also disclosed (see FIGS. 3 and 4 of the following patent document). In such a structure, when the annular mass body is displaced to one side in the axial direction, the inner circumferential surface of each through hole provided in the annular mass body is the outer circumference of each stopper pin protruding from the inner cylindrical metal fitting. Is engaged with the surface, so that further displacement of the annular mass body in one axial direction is restricted, and the annular mass body is prevented from being pulled out in one axial direction with respect to the inner metal fitting. -ing

  However, in the case of adopting the above-described structure, it is necessary to provide a gap between the annular mass body and the outer flange so that the vibration of the annular mass body can be tolerated to some extent. It was inevitable that the axial length of the metal fitting was excessively lengthened by an amount corresponding to the size of the gap, and the entire torsional damper was increased in size. Therefore, the torsional damper having such a structure has a problem that it is difficult or impossible to install in a place where the installation space is limited.

  In addition, when adopting the above-mentioned another structure in which stopper pins are provided at a plurality of locations in the circumferential direction of the inner cylindrical metal fitting, and through holes into which the respective stopper pins are inserted are provided in the annular mass body, Usually, the annular mass body is configured to have a large thickness so as to have a predetermined mass. Therefore, it is easy to provide a plurality of through holes in such a thick annular mass body. In addition, in order to stably secure the weight balance in the circumferential direction of the annular mass body, it is necessary to strictly manage and control the size and formation position of each through hole. Therefore, the torsional damper having the another structure has a disadvantage that it is inferior in manufacturability and therefore in mass production.

JP-A-5-223140

  Here, the present invention has been made in the background as described above, and the problem to be solved is that it is possible to prevent the mass body from being pulled out to one side in the axial direction with respect to the inner cylindrical fitting. An object of the present invention is to provide a torsional damper realized with a compact structure and excellent manufacturability.

  In order to solve the above-described problem, the first aspect of the present invention includes (a) an inner cylinder fitting fixed to the rotating shaft, and (b) radially outward of the inner cylinder fitting. An outer cylinder fitting that is concentrically spaced apart, and (c) interposed between the inner cylinder fitting and the outer cylinder fitting, and vulcanizing and bonding the inner cylinder fitting and the outer cylinder fitting A rubber elastic body to be elastically connected; and (d) a hollow space formed so as to extend in the axial direction at a plurality of circumferential positions of the rubber elastic body; and (e) having a predetermined mass. A mass body that is formed of a cylindrical body or an annular body and is press-fitted and fixed to the outer peripheral surface of the outer cylindrical metal fitting; and (f) the inner portion of the rubber elastic body that corresponds to the formation portion of the meat cavity. Provided between the outer peripheral surface portion of the cylindrical metal fitting and the inner peripheral surface portion of the outer cylindrical metal fitting so as to restrict displacement of the outer cylindrical metal fitting in one axial direction. , In torsional damper, characterized in that configured to include a stopper means for preventing escape of the axial direction one side against the inner tubular member of the outer tubular member.

  In short, in the first aspect, since the stopper member prevents the outer cylinder fitting whose mass body is press-fitted and fixed to the outer peripheral surface from being stopped by the stopper means, the processing is not easy. In addition, it is possible to prevent the mass body from being pulled out to one side in the axial direction with respect to the inner metal fitting without performing any processing on the mass body that requires strict management and control when performing the machining. Can be demonstrated.

  Further, in the first aspect, the stopper means includes an outer peripheral surface portion of the inner cylindrical metal member and an inner peripheral surface of the outer cylindrical metal member that are located at a plurality of positions in the circumferential direction of the rubber elastic body so as to correspond to the respective empty spaces. For example, by providing an outer flange at one end of the inner cylindrical metal fitting so as to be opposed to the end surface of the mass body with a predetermined gap therebetween, Unlike the conventional device having a structure that prevents the inner cylinder fitting from being pulled out, it is not necessary to make the axial length of the inner cylinder fitting larger than the axial length of the mass body. The feature that the axial direction length of a metal fitting and by extension, the axial direction length of the whole torsional damper can be suppressed as small as possible can also be exhibited.

  Further, in the second aspect of the torsional damper according to the present invention, the stopper means is a first engagement protrusion formed so as to protrude radially outward with respect to the outer peripheral surface portion of the inner cylinder fitting. And a portion of the inner peripheral surface portion of the outer cylinder fitting that is separated by a predetermined distance on the side opposite to the one side in the axial direction from the formation portion of the first engagement protrusion in the inner cylinder fitting And a second engaging protrusion that protrudes inward in the radial direction so as to face the first engaging protrusion in the axial direction. When the first engagement protrusion and the second engagement protrusion are engaged with each other when displaced in one axial direction, the one axial direction of the outer tube fitting It is comprised so that the displacement to may be controlled.

  In this second aspect, the inner cylinder is used as the first engagement protrusion or the second engagement protrusion that is formed to protrude from the outer peripheral surface portion of the inner cylindrical metal fitting or the inner peripheral surface portion of the outer cylindrical metal fitting. The axial ends of the metal fittings and outer cylinder fittings are partly bent and deformed outward or inward, so that they are integrally formed on the outer peripheral surface portion of the inner cylinder fitting and the inner peripheral surface portion of the outer cylinder fitting. Included. In addition, the first engaging protrusion is made of a member separate from the inner cylinder fitting, and is integrally joined to the outer peripheral surface of the inner cylinder fitting, the end face in the axial direction, etc. On the other hand, those that are formed to protrude radially outward are also included, and the second engaging protrusion is a member that is separate from the outer cylinder fitting, and the inner peripheral surface and the axial direction of the outer cylinder fitting It is to be understood that a device that is integrally joined to the end surface of the outer shell and that protrudes radially inward with respect to the outer tube fitting is also included.

  Furthermore, in the third aspect of the torsional damper according to the present invention, a radially outer portion is provided on a portion of the outer peripheral surface of the outer cylindrical metal fitting on the one side in the axial direction with respect to the press-fitted portion into the inner hole of the mass body. A third engaging protrusion projecting in the direction is provided, and the mass body is engaged with the third engaging protrusion so that displacement in one axial direction is restricted. It will be configured.

  Furthermore, in the fourth aspect of the torsional damper according to the present invention, the axial length of the inner cylinder fitting is made smaller than the axial length of the outer cylinder fitting.

  In the fifth aspect of the torsional damper according to the present invention, the rotation shaft on which the inner cylinder fitting is externally fixed is a rotation axis of a differential mechanism of an automobile, and the axial direction of the inner cylinder fitting In a state where the propeller shaft connected to the rotating shaft is disposed on one side, the inner cylinder fitting is externally fixed to the rotating shaft.

  And in order to solve the said subject, the place made into the 6th aspect of this invention is (a) the inner cylinder metal fitting fixed to a rotating shaft, (b) The radial direction outer side of this inner cylinder metal fitting An outer cylinder fitting that is concentrically spaced apart, and a cylindrical body or an annular body having a predetermined mass, and the outer cylinder fitting is fixed by being press-fitted into the inner hole. (C) is interposed between the outer cylinder fitting and the inner cylinder fitting of the mass member, and the outer cylinder fitting and the inner cylinder fitting are vulcanized and bonded to each other. A rubber elastic body to be connected; and (d) an empty space formed so as to extend in an axial direction at a plurality of locations in the circumferential direction of the rubber elastic body; and (e) the meat of the rubber elastic body. Between the outer peripheral surface portion of the inner cylinder fitting and the inner peripheral surface portion of the mass member located corresponding to the formation portion of the empty space, one axial direction of the mass member The torsional damper is characterized in that it includes a stopper means provided to restrict displacement of the mass member to the one side in the axial direction of the mass member with respect to the inner cylindrical fitting. .

  In short, in such a sixth aspect, the mass member is composed of the mass body and the outer cylindrical metal fitting that is press-fitted and fixed to the outer peripheral surface, and is provided at a plurality of locations in the circumferential direction of the rubber elastic body. Since the stopper means is provided between the outer peripheral surface portion of the inner cylindrical metal fitting corresponding to each empty space and the inner peripheral surface portion of the mass member, the inner cylindrical metal fitting is attached to the mass body. Unlike the conventional device in which the protruding stopper pin is provided with a through-hole inserted so as to be engageable in the axial direction of the inner cylinder fitting, the mass pin is used to prevent the mass body from coming out of the inner cylinder fitting. It is not necessary to perform extremely troublesome drilling processing on the body. In addition, for example, unlike the conventional device in which an outer flange is provided at one end of the inner cylinder fitting so as to face the end surface of the mass body with a predetermined gap, the axial length of the inner cylinder fitting is different. It is not necessary to make the length larger than the axial length of the mass member. Therefore, the axial length of the inner cylinder fitting, and thus the axial length of the entire torsional damper can be suppressed as small as possible. Features can be demonstrated.

  In the sixth aspect, for example, the projections are formed on the inner peripheral surface portion of the mass member and the outer peripheral surface portion of the inner cylindrical fitting, and are engaged with each other in the axial direction due to the displacement of one side of the mass member in the axial direction. In the case where the stopper means is configured by the engaging protrusions that can be combined, the axial end portions of the outer cylinder fitting and the inner cylinder fitting in the mass member are partially formed as the engagement protrusions, respectively. In addition, those formed integrally with the inner peripheral surface portion of the mass member and the outer peripheral surface portion of the inner cylindrical metal fitting by being bent and deformed inward and outward are included. In addition, the engaging protrusion provided on the outer peripheral surface portion of the inner cylinder fitting is a member separate from the inner cylinder fitting, and is integrally joined to the outer circumference surface of the inner cylinder fitting, the end face in the axial direction, or the like. In addition, those that protrude outward in the radial direction with respect to the inner cylinder fitting are also included, and the engagement protrusion provided on the inner peripheral surface portion of the mass member includes the outer cylinder fitting of the mass member, It consists of a separate member from the mass body, and is integrally joined to the inner peripheral surface of the outer tube metal fitting, the axial end surface, or the axial end surface of the mass body, and is radially inward of the mass member. It should be understood that the protrusions are also included.

  In the first aspect of the torsional damper according to the present invention, it is possible to prevent the mass body from being pulled out to the one side in the axial direction with respect to the inner cylindrical metal fitting by exhibiting the characteristics as described above. It can be realized with a compact structure and excellent manufacturability. As a result, for example, the rubber elastic body is ruptured while ensuring sufficient installation adaptability and excellent mass productivity that can be installed in a limited installation space. The fail-safe mechanism that prevents damage caused by contact with the rotating shaft to which the inner cylinder fitting is fixed, the surrounding members, parts, and other mass bodies can be made to function extremely advantageously. To get.

  Further, according to the second aspect of the torsional damper according to the present invention, the stopper means for preventing the mass body from coming out to the one side in the axial direction with respect to the inner cylindrical fitting can be advantageously realized with a simple structure.

  Further, in the third aspect of the torsional damper according to the present invention, the mass body is prevented from being pulled out to the one side in the axial direction with respect to the outer cylinder fitting, whereby the mass body extracted from the outer cylinder fitting is It can be effectively prevented that the rotating shaft to which the tubular metal fitting is fixed and the surrounding members, parts, and other mass bodies are contacted and damaged. And, in particular, when the mass body is press-fitted and fixed to the outer cylinder fitting in a state of being engaged with the third engagement protrusion, the mass body is located at a preset position of the outer cylinder fitting, It can be reliably positioned.

  Furthermore, in the fourth aspect of the torsional damper according to the present invention, for example, when the inner cylinder fitting is press-fitted and fixed to the outer peripheral surface of the rotation shaft, pressure input to the rotation shaft of the inner cylinder fitting, The stress generated on the rotating shaft by the press-fitting of the inner cylinder fitting can be reduced as much as possible, and the assembly of the torsional damper to the member that absorbs vibration can be advantageously improved. The deformation of the rotating shaft can be prevented in advance.

  Moreover, according to this 4th aspect, it becomes possible to determine the axial direction length of the whole torsional damper with the axial direction length of an outer cylinder metal fitting. Therefore, the axial length of the entire torsional damper is made possible after setting the axial length of the outer cylindrical bracket so that the press-fit state of the mass body with respect to the outer cylindrical bracket is sufficiently maintained. The advantage that it can be made small is obtained.

  Furthermore, according to the fifth aspect of the torsional damper according to the present invention, the mass body that has come out of the inner cylindrical metal fitting comes into contact with the propeller shaft, thereby damaging the propeller shaft, thereby causing serious damage to the automobile. It is possible to effectively prevent damage.

  And even if it exists in the 6th aspect of the torsional damper according to this invention, the effect | action and effect similar to an effect | action and effect show | played in a 1st aspect can be enjoyed very effectively.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, in FIGS. 1 and 2, as an example of a torsional damper having a structure according to the present invention, a torsional damper fixed to a rotating shaft of a differential mechanism of an automobile has a front form and a longitudinal sectional form, respectively. It is shown schematically. As is apparent from the drawings, the torsional damper 10 of this embodiment includes an inner cylinder fitting 12 and an outer cylinder fitting 14 arranged concentrically with each other, and the inner cylinder fitting 12 and the outer cylinder fitting 14. A rubber elastic body 16 interposed between them and elastically connecting them, and a mass body 18 press-fitted into the outer peripheral surface of the outer cylinder fitting 14 are constituted.

  More specifically, the inner cylinder fitting 12 is made of, for example, an iron press-molded product, and has a thin cylindrical shape with a short axial length (low height) as a whole, as shown in FIGS. 2 and 3. have. Further, in the inner cylindrical metal member 12, both axial end portions of the inner peripheral surface are respectively tapered surface shapes that gradually increase in diameter toward the opening side, so that only the axial intermediate portion is provided. However, it is made into the cylindrical surface shape extended with the same diameter in an axial direction. As a result, the axially intermediate portion of the inner peripheral surface of the inner cylindrical fitting 12 is a cylindrical press-fit surface portion 22 having a shorter axial length than the axial length of the entire inner cylindrical fitting 12. .

  In addition, six plate-like bent pieces 24 are integrally provided on the outer peripheral surface of the inner cylindrical metal member 12. Each of the six plate-like bent pieces 24 is, for example, a long rectangular flat plate made of iron, which is curved in an arc shape having substantially the same diameter as the outer diameter of the inner cylindrical metal member 12 in the length direction, and in the width direction. In FIG. 2, the substantially half portion on one side in the width direction from the bent portion is the fixing portion 26, and the remaining substantially on the other side in the width direction from the bent portion. A half portion is a first engagement protrusion 28 that protrudes perpendicularly toward one side in the thickness direction of the fixing portion 26.

  Then, such six plate-like bent pieces 24 are arranged at equal distances in the circumferential direction in the axially intermediate portion of the outer peripheral surface of the inner cylindrical metal member 12, and the first engaging protrusions in the fixing portion 26. On the surface opposite to the protruding side of 28, each is welded and fixed (fixed). Accordingly, here, the first engagement protrusion 28 in the plate-shaped bent piece 24 has a predetermined protrusion height at a portion having a phase difference of 60 ° in the axial direction intermediate portion of the outer peripheral surface of the inner cylindrical metal member 12. Thus, it is integrally formed so as to protrude outward in the radial direction and to extend in the circumferential direction with a predetermined length.

  Further, the outer cylinder fitting 14 is also made of, for example, an iron press-molded product, and has an axial length (higher height) longer than the axial length of the inner cylinder fitting 12 as shown in FIGS. As a whole, it has a thin cylindrical shape. Further, the outer cylinder fitting 14 has a radius of the first engagement protrusion of the outer peripheral surface of the inner cylinder fitting 12 and the plate-like bent piece 24 projecting from the outer periphery of the inner cylinder fitting 12. The predetermined dimension is made larger than the total dimension of the projecting height of the portion 24. And in this outer cylinder metal fitting 14, the outer flange part 30 which protrudes a predetermined dimension to radial direction outward and is extended continuously in the circumferential direction is integrally formed in the edge part of the axial direction one side. . That is, the outer flange portion 30 in the form of an annular plate is integrally provided on the outer peripheral surface of one end portion of the outer cylinder fitting 14.

  Further, an inner flange portion 32 having an annular plate shape is integrally provided on the inner peripheral surface of the end portion on the other side in the axial direction of the outer cylinder fitting 14. The annular plate-like inner flange portion 32 has a radius of the inner hole of the annular plate that is larger than the radius of the outer peripheral surface of the inner cylindrical metal member 12, and the radius of the outer peripheral surface of the inner cylindrical metal member 12, A predetermined dimension is made smaller than the total dimension of the projection-like height of the first engaging protrusion 24 in the plate-like bent piece 24 provided there.

  And in this inner flange part 32, the rectangular notch part 34 is each provided in six places equally spaced in the circumferential direction, Out of these six notch parts 34, it is the circumferential direction. The portions located between the adjacent notch portions 34 are respectively the second engagement protrusions 36. In other words, here, the six second engaging protrusions 36 have a phase difference of 60 ° with respect to the circumferential direction at the end of the outer tube fitting 14 opposite to the outer flange portion 30 formation side. Each of the positions has an inner flange shape and is integrally provided. Each of the second engaging protrusions 36 is configured to have a height and a circumferential length larger than the first engaging protrusion 28 by a predetermined dimension (see FIG. 1).

  As shown in FIGS. 1 and 2, the outer cylinder fitting 14 is connected to the inner cylinder so that the inner circumferential surface of the outer cylinder fitting 14 and the outer circumference of the inner cylinder fitting 12 are opposed to each other in the radial direction. The metal fitting 12 is concentrically arranged so as to be spaced radially outward. Moreover, under such an arrangement state, each of the six second engaging protrusions 36 in the outer cylinder fitting 14 and each of the first engagement protrusions of the six plate-like bent pieces 24 in the inner cylinder fitting 12. 28 are respectively opposed to each other at a predetermined distance in the axial direction of the inner cylinder and the outer cylinder fittings 12 and 14 at the tip portions. Further, each first engagement protrusion 28 has its tip end surface positioned at a predetermined distance radially inward from the inner peripheral surface of the outer cylinder fitting 14, and the second engagement protrusion 28. The projecting portion 36 has a tip end surface positioned at a predetermined distance from the outer peripheral surface of the inner cylindrical metal member 12 on the radially outer side.

  On the other hand, the rubber elastic body 16 interposed between the inner cylinder fitting 12 and the outer cylinder fitting 14 in such an arrangement state has a thick, substantially cylindrical shape, and is formed with respect to the inner peripheral surface. The inner cylinder fitting 12 and the outer cylinder fitting 14 are vulcanized and bonded to the outer peripheral surface, respectively.

  Further, in such a rubber elastic body 16, one by one so that the empty space 38 extends in the axial direction at six places having a phase difference of 60 ° in the circumferential direction. Formed, whereby the spring stiffness is advantageously reduced. Further, the six hollow spaces 38 are the outer peripheral surface portions of the six portions where the first engaging protrusions 28 (plate-like bent pieces 24) are integrally formed on the outer peripheral surface of the inner cylindrical metal member 12. And the rubber elastic body 16 portion located between the inner peripheral surface portion of the outer cylindrical metal member 14 and the six inner peripheral surface portions where the second engaging projections 36 are integrally formed, It has the form which is removed by. The length of the oval-shaped empty space 38 is longer than the respective circumferential lengths of the first engagement protrusion 28 and the second engagement protrusion 36 by a predetermined dimension. .

  Thus, here, the six first engaging protrusions 28 provided on the outer peripheral surface of the inner cylinder fitting 12 under the elastic connection between the inner cylinder fitting 12 and the outer cylinder fitting 14 by the rubber elastic body 16 Of the six second engaging projections 36 provided on the inner peripheral surface of the outer cylinder fitting 14, no rubber elastic body 16 portion is interposed between the two opposing engagement projections 36. It has become. That is, in other words, even when the inner cylinder fitting 12 and the outer cylinder fitting 14 are elastically connected by the rubber elastic body 16, the six first engagement protrusions 28 and the six second engagements are provided. Among the protrusions 36, those provided on the outer peripheral surface portion of the inner cylindrical metal member 12 and the inner peripheral surface portion of the outer cylindrical metal member 14 corresponding to each of the forming portions of the six empty empty spaces 38, They are opposed to each other at a predetermined distance in the axial direction.

  In addition, the circumferential length of each hollow space 38 of the rubber elastic body 16 is longer than the circumferential length of the second engagement protrusion 36 by a predetermined dimension, and the second engagement protrusion 36. Are positioned at a predetermined distance from the outer peripheral surface of the inner cylindrical metal member 14 at a predetermined distance, thereby causing the inner cylindrical metal member 12 and the outer cylindrical metal member 14 to be relatively displaced in the axial direction. Thus, when the rubber elastic body 16 is elastically deformed, the end surface of the rubber elastic body 16 and the end surface of the inner cylinder fitting 12 come into contact with the second engagement protrusion 36, so Relative displacement with the cylindrical metal fitting 14 and elastic deformation of the rubber elastic body are not hindered.

  On the other hand, as shown in FIGS. 2 and 5, the mass body 18 is made of, for example, iron and is formed of a cylindrical body or a ring body having a predetermined mass. Further, in this mass body 18, both end portions in the axial direction of the inner peripheral surface are formed into tapered surface shapes that gradually increase in diameter toward the opening side, while the intermediate portion in the axial direction is the outer cylinder. To the extent that it can be press-fitted into the outer peripheral surface of the metal fitting 14, the cylindrical surface has an inner diameter that is smaller than the outer diameter of the outer cylinder metal fitting 14. Is the press-fit surface portion 40.

  As shown in FIGS. 1 and 2, the mass body 18 is press-fitted into the outer peripheral surface of the outer cylinder fitting 14 at the press-fitting surface portion 40 and fixed to the outer cylinder fitting 14, and Under such a state that the mass body 18 is press-fitted and fixed to the outer cylinder fitting 14, the end face on one side in the axial direction of the mass body 18 is brought into contact with and engaged with the outer flange portion 30 of the outer cylinder fitting 14. . Thereby, here, the mass body 18 has an outer cylinder with respect to the integrally vulcanized molded product in which the inner cylinder fitting 12 and the outer cylinder fitting 14 are vulcanized and bonded to the inner and outer peripheral surfaces of the rubber elastic body 16. The metal fitting 14 is integrally assembled in a state where the metal fitting 14 is positioned at a contact position with the outer flange portion 30. Further, under the assembled state with respect to such an integrally vulcanized molded product, the mass body 18 is formed on the outer flange portion 30 forming side in the axial direction of the outer cylinder fitting 14, that is, on the forming side of the second engaging protrusion 36. Is prevented from being detached from the integrally vulcanized molded product (outer tube fitting 14) toward the opposite side.

  Thus, in the present embodiment, the mass body 18 and the outer cylindrical fitting 14 to which it is press-fitted and fixed are configured as a mass member 20 having a predetermined mass, and the torsional damper 10 is connected to the mass member 20. The inner cylinder fitting 12 is configured as an integral product in which the rubber elastic body 16 is integrally elastically connected.

  In the torsional damper 10 of this embodiment having such a structure, a flange yoke 44 (see FIG. 1) in which the inner tube metal fitting 12 is attached to a rotating shaft of a differential mechanism of an automobile (not shown) so as to be integrally rotatable. It is press-fitted at the press-fit surface portion 22 and fixed to the outer peripheral surface of the end portion on the connection side with the propeller shaft 46 (shown by a two-dot chain line in FIG. 1) in the two-dot chain line). . As a result, when torsional vibration is generated around the axis of the rotary shaft of the differential mechanism, the rubber elastic body 16 to which the mass member 20 (the outer cylinder fitting 14 and the mass body 18) is vulcanized is resonated. Thus, such torsional vibration can be effectively absorbed. In addition, here, as described above, the rubber elastic body 16 is provided with the six hollow spaces 38, and the spring rigidity of the rubber elastic body 16 is set to be small. Among torsional vibrations, an anti-vibration effect for torsional vibrations in the low frequency range can be advantageously obtained.

  Further, in the torsional damper 10, the six first engaging protrusions 28 provided on the outer peripheral surface of the inner cylinder fitting 12 are in the inner circumference of the outer cylinder fitting 14 in the press-fitted state to the flange yoke 44. It is arranged on the propeller shaft 46 side (left side in FIG. 2) with respect to the six second engaging projections 36 provided on the surface so as to be opposed to each other with a predetermined distance in the axial direction. Has been. Thereby, for example, when the inner cylindrical metal member 12 and the outer cylindrical metal member 14 are moved relative to each other in the axial direction due to the rubber elastic member 16 being broken or the like, the rubber elastic member 16 is passed through the respective hollow spaces 38. The first engaging protrusion 28 and the second engaging protrusion 36 that are arranged to face each other are brought into contact with each other and engaged with each other, so that the outer cylinder fitting 14 is moved to the propeller shaft 46 side. On the other hand, it is prevented from slipping out of the inner tube fitting 12. As is clear from this, in the present embodiment, the first engagement protrusion 28 and the second engagement protrusion 36 constitute stopper means.

  As described above, in the torsional damper 10 according to the present embodiment, the torsional vibration around the axial center generated in the rotating shaft of the differential mechanism can be effectively absorbed by the resonance action of the rubber elastic body 16. Therefore, damage to the rotating shaft of the differential mechanism due to such torsional vibration, vibration of the differential mechanism, noise, and the like can be advantageously eliminated.

  In particular, in the torsional damper 10, even when the rubber elastic body 16 is broken or the like, the first engagement protrusion 28 provided on the outer peripheral surface of the inner cylinder fitting 12 and the inner part of the outer cylinder fitting 14 are Since the engagement with the second engagement protrusion 36 provided on the peripheral surface prevents the outer cylinder fitting 14 from being pulled out to the propeller shaft 46 side with respect to the inner cylinder fitting 12, this outer A relatively heavy mass 18 that is fixed to the cylinder fitting 14 and constitutes the mass member 20 comes out of the inner cylinder fitting 12 together with the outer cylinder fitting 14 and comes into contact with the propeller shaft 46, thereby propeller shaft 46 and eventually. It is possible to prevent an extremely serious damage to the automobile.

  In addition, in the present embodiment, in order to prevent the outer cylinder fitting 14 from coming out of the inner cylinder fitting 12, the first engagement protrusion 28 and the second engagement protrusion 36 are formed by the inner cylinder fitting 12. And a thick cylindrical body or ring body that is not easy to process, and when processing, it is necessary to obtain sufficient vibration isolation performance. However, the mass body 18 that requires strict management and control of the machining state is not subjected to any machining.

  In addition, the first engagement protrusion 28 and the second engagement protrusion 36 are located on the outer peripheral surface portion of the inner cylindrical metal member 12 and the outer portion of the rubber elastic body 16 corresponding to the formation portions of the respective hollow portions 38. Since the first and second engaging projections 28 and 36 are formed on the inner peripheral surface portion of the cylindrical fitting 14, the inner cylindrical fitting 12, the outer cylindrical fitting 14, and further the rubber elasticity are formed. The axial length of the body 16 is not increased, that is, the entire torsional damper 10 is not enlarged.

  Therefore, in the torsional damper 10 according to the present embodiment as described above, it is possible to prevent the mass body 18 from slipping out from the inner cylindrical metal member 12 and the occurrence of damage to the propeller shaft 46 due to that. With its structure and excellent manufacturability, it can be realized very advantageously.

  Further, in the torsional damper 10, the first engagement protrusion 28 is constituted by a part of the plate-like bent piece 24 fixed to the outer peripheral surface of the inner cylindrical metal member 12 by welding or the like. Since the second engaging protrusion 36 is formed at a part of the inner flange portion 32 formed integrally with the outer cylinder fitting 14, the first and second engaging protrusions 28 are provided. , 36 can advantageously avoid the complicated structure of the inner and outer cylindrical fittings 12, 14, and the torsional damper 10 as a whole.

  Furthermore, in the present embodiment, the mass body 18 is brought into the second engagement by the outer flange portion 30 provided at the end of the outer tube metal 14 opposite to the side where the second engagement protrusion 36 is formed. Since it is prevented from being detached from the outer cylinder fitting 14 toward the side opposite to the side where the protrusions 36 are formed, only the mass 18 is pulled out from the inner cylinder fitting 12 to the propeller shaft 46 side. Further, it is possible to reliably prevent the propeller shaft 46 from being touched and damaged.

  Furthermore, in the torsional damper 14 of the present embodiment, the axial length of the inner cylindrical fitting 12 is made shorter than the axial length of the outer cylindrical fitting 14, and on the outer peripheral surface of the flange yoke 44. Since the press-fitting surface portion 22 of the inner cylinder fitting 12 to be press-fitted is configured to have a shorter axial length than the inner cylinder fitting 12, pressure input to the flange yoke 44 of the inner cylinder fitting 12 is advantageous. Therefore, the flange yoke 44 can be prevented from being deformed by the press-fitting of the inner cylinder fitting 12. In addition, the axial length of the torsional damper 10 as a whole is set after the axial length of the outer cylindrical bracket 14 is set so that the press-fit state of the mass body 18 with respect to the outer cylindrical bracket 14 is sufficiently maintained. This is advantageous in that it can be made as small as possible in accordance with the axial length of the outer cylinder fitting 14.

  As mentioned above, although one Embodiment of this invention was explained in full detail, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description regarding this Embodiment.

  For example, the number of the first and second engaging protrusions 28 and 36 installed on the outer peripheral surface of the inner cylinder fitting 12 and the inner circumference surface of the outer cylinder fitting 14 is not limited to the exemplified number. .

  Further, the installation structure of the first engagement protrusion 28 with respect to the outer peripheral surface of the inner cylinder fitting 12 and the installation structure of the second engagement protrusion 36 with respect to the inner periphery of the outer cylinder fitting 14 are also shown in the above embodiment. It is not particularly limited to those.

  For example, as shown in FIG. 6, the outer flange projects at a plurality of locations in the circumferential direction at one end in the axial direction of the inner cylindrical metal member 12 and protrudes by a predetermined dimension radially outward and with a predetermined length in the circumferential direction. The portion 48 may be integrally formed, and the plurality of outer flange portions 48 may constitute the first engagement protrusion. Such an outer flange portion 48 can of course be provided at the end portion on the other side in the axial direction of the inner cylinder fitting 12 in FIG.

  Further, as shown in FIG. 7, a member separate from the outer cylinder fitting 14 is provided at the end of the outer cylinder fitting 14 opposite to the formation side of the outer flange portion 30, from a part of the annular plate. The plurality of arc-shaped flat plate members 50 may be integrally joined by welding, adhesion, or the like, and the plurality of flat plate members 50 may constitute the second engaging protrusions. In addition, it is also possible to integrally join such a flat plate member 50 to the axially intermediate portion on the inner peripheral surface of the outer cylinder fitting 14. Further, as the flat plate member 50, an annular plate is used instead of the arcuate one, and this single circular flat plate member 50 is integrally joined to the end of the outer tube fitting 14. Thus, the second engagement protrusion can be configured.

  Further, as shown in FIG. 8, an inner diameter smaller than the inner diameter of the mass body 18 by a predetermined dimension on an end surface opposite to the abutting side with the outer flange portion 30 of the outer cylinder fitting 14 among both end faces of the mass body 18. A plurality of arc-shaped flat plate members 52 made of a part of an annular plate having a plurality of members are integrally joined by welding, adhesion, or the like, and the plurality of flat plate members 52 are used to form second engaging protrusions. It may be configured. Of course, in this case as well, the flat plate member 52 is replaced with a circular one instead of the circular one, and this one circular flat plate member 52 is integrated with the end of the mass body 18. It can also join and can comprise the 2nd engagement protrusion.

  In addition, even when the second engaging protrusion is provided on the mass member 20 by bonding the flat plate member 52 to the mass body 18 in this way, the formation is different from the conventional damper described above. From the point where no hole is provided in the mass body 18 which is extremely troublesome and is likely to impair the weight balance in the circumferential direction of the mass body 18. The action and effect exhibited in the above embodiment that the prevention of the occurrence of damage to the propeller shaft 46 due to this can be realized extremely advantageously with as compact a structure as possible and excellent manufacturability is effective. It can be enjoyed.

  Further, the shape and the number of arrangement of the empty space 38 provided in the rubber elastic body 16 are not limited to those shown in the embodiment. In addition, the outer peripheral surface portion of the inner cylindrical metal member 12 and the inner peripheral surface portion of the outer cylindrical metal member 14 which are positioned corresponding to the formation part of the empty space 38 of the rubber elastic body 16 are not necessarily included in the first There is no need to provide one engaging protrusion 28 or second engaging protrusion 36.

  Furthermore, as a matter of course, it is possible to constitute the stopper means other than the structure composed of the first engagement protrusion 28 and the second engagement protrusion 36.

  In addition, the present invention is provided in a torsional damper that is fixed to a rotating shaft of a differential mechanism of an automobile as illustrated, a torsional damper that is fixed to a crankshaft of an automobile, and various mechanical devices other than an automobile. Of course, the present invention can be applied to any torsional damper fixed to a rotating shaft.

  In addition, although not enumerated one by one, the present invention can be carried out in an embodiment to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

It is front explanatory drawing which shows one Embodiment of the torsional damper according to this invention. It is II-II sectional explanatory drawing in FIG. It is front explanatory drawing which shows an example of the inner cylinder metal fitting which comprises the torsional damper shown by FIG. It is front explanatory drawing which shows an example of the outer cylinder metal fitting which comprises the torsional damper shown by FIG. It is a longitudinal cross-sectional explanatory drawing which shows an example of the mass body which comprises the torsional damper shown by FIG. It is a figure corresponding to FIG. 2 which shows another embodiment of the torsional damper according to this invention. It is a figure corresponding to FIG. 2 which shows another embodiment of the torsional damper according to this invention. It is a figure corresponding to FIG. 2 which shows other embodiment of the torsional damper according to this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Torsional damper 12 Inner cylinder metal fitting 14 Outer cylinder metal fitting 16 Rubber elastic body 18 Mass body 20 Mass member 28 First engagement protrusion 30 Outer flange part 36 Second engagement protrusion 38 Meat emptying space 44 Flange yoke 46 propeller shaft

Claims (6)

An inner metal fitting fixed to the rotary shaft;
An outer cylinder fitting arranged concentrically, spaced radially outward of the inner cylinder fitting;
A rubber elastic body interposed between the inner cylinder fitting and the outer cylinder fitting, vulcanized and bonded to the inner cylinder fitting and the outer cylinder fitting, and elastically coupled;
A plurality of empty spaces formed so as to extend in the axial direction at a plurality of locations in the circumferential direction of the rubber elastic body,
A cylindrical body or a ring-shaped body having a predetermined mass, and a mass body that is press-fitted and fixed to the outer peripheral surface of the outer cylinder fitting;
Between the outer peripheral surface portion of the inner cylindrical metal fitting and the inner peripheral surface portion of the outer cylindrical metal fitting corresponding to the forming portion of the hollow space of the rubber elastic body, to the one axial side of the outer cylindrical metal fitting Stopper means for restricting displacement of the outer cylinder fitting and preventing the outer cylinder fitting from being pulled out to the one side in the axial direction with respect to the inner cylinder fitting;
A torsional damper characterized by comprising the above.   The stopper means includes a first engaging protrusion that is formed to protrude radially outward with respect to the outer peripheral surface portion of the inner cylindrical metal member, and the inner peripheral surface portion of the outer cylindrical metal member. An axial direction with respect to the first engagement protrusion is provided at a position that is separated by a predetermined distance on the side opposite to the one side in the axial direction from the formation part of the first engagement protrusion in the inner cylindrical metal fitting. And a second engaging protrusion formed so as to protrude inward in the radial direction so as to face each other, and when the outer cylinder fitting is displaced to the one side in the axial direction, the first 2. The displacement of the outer cylinder fitting to the one side in the axial direction is regulated by engaging the engagement protrusion and the second engagement protrusion with each other. The torsional damper described.   Of the outer peripheral surface of the outer cylindrical metal fitting, a third engagement protrusion protruding outward in the radial direction is provided at a portion on the one axial side of the press-fitting portion into the inner hole of the mass body. The toe according to claim 1 or 2, wherein the mass body is engaged with the third engaging protrusion, whereby displacement in one axial direction is restricted. National damper.   The torsional damper according to any one of claims 1 to 3, wherein an axial length of the inner cylinder fitting is smaller than an axial length of the outer cylinder fitting.   The rotation shaft on which the inner cylinder fitting is externally fixed is a rotation axis of a differential mechanism of an automobile, and a propeller shaft connected to the rotation shaft is arranged on one side in the axial direction of the inner cylinder fitting. The torsional damper according to any one of claims 1 to 4, wherein the inner cylindrical metal fitting is extrapolated and fixed to the rotating shaft under the condition. An inner metal fitting fixed to the rotary shaft;
The outer cylinder fitting is concentrically arranged apart from the radial outer side of the inner cylinder fitting, and a cylindrical body or an annular body having a predetermined mass, and the outer cylinder fitting is placed in the inner hole. A mass member composed of a mass body that is press-fitted and fixed;
A rubber elastic body interposed between the outer cylinder fitting and the inner cylinder fitting of the mass member, vulcanized and bonded to the outer cylinder fitting and the inner cylinder fitting, and elastically coupled;
A plurality of empty spaces formed so as to extend in the axial direction at a plurality of locations in the circumferential direction of the rubber elastic body,
Displacement of the mass member toward the one side in the axial direction between the outer peripheral surface portion of the inner cylindrical metal fitting and the inner peripheral surface portion of the mass member, which is positioned corresponding to the formation portion of the hollow space of the rubber elastic body Stopper means for preventing the mass member from coming out to the one side in the axial direction with respect to the inner cylindrical metal fitting,
Torsional damper characterized by comprising.

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