JP4877489B2 - Rotation fluctuation absorbing damper - Google Patents

Description

  The present invention relates to a rotational fluctuation absorbing damper that is attached to a crankshaft of an engine and absorbs torsional vibration of the crankshaft and absorbs rotational fluctuation of the crankshaft generated by the engine.

  Conventionally, what is described in the following patent document 1 is known as this kind of rotation fluctuation absorption damper. The rotational fluctuation absorbing damper is attached to the crankshaft of the engine, absorbs torsional vibration of the crankshaft, and absorbs rotational fluctuation of the crankshaft caused by torque fluctuation at the time of low engine rotation. As shown in FIG. 6, the rotational fluctuation absorbing damper 100 includes a damper portion 110 including a hub 111, a damper mass 112, and a damper rubber 113, a stay 121, a pulley 122, and a coupling rubber 123. And a cover portion 122a of a pulley 122, to which one end surface of the coupling rubber 123 is fixed, is interposed via a thrust bearing 131 by a pressing portion 130a of a pressing member 130 disposed on the outside thereof. By being pressed in the axial direction, the coupling rubber 123 is pre-compressed in the axial direction.

  Further, in order to prevent the cover 122a of the pulley 122 and the pressing member 130 from mechanically interfering when the pressing member 130 fixed to the hub 111 and the pulley 122 are relatively displaced in the twisting direction, the cover of the pulley 122 is used. There is a slight gap C1 between the portion 122a and the outer diameter end of the pressing portion 130a of the pressing member 130, and dust or the like may enter from the gap C1, so that the gap C1 is covered. A seal part 140 having a lip part 141 is disposed.

  The seal portion 140 is formed of a rubber-like elastic body in which the lip portion 141 and the base portion 142 are integrated. The base portion 142 is fixed to the cover portion 122a of the pulley 122, and the lip portion 141 is pressed by the pressing member 130. The end portion of the portion 130a is in pressure contact, or the base portion 142 is fixed to the end portion of the pressing portion 130a and the lip portion 141 is in pressure contact with the cover portion 122a to close the gap C1. Intrusion between the cover portion 122a and the pressing portion 130a is prevented, and durability of the thrust bearing 131 provided between the pressing portion 130a and the cover portion 122a is prevented.

  However, since the seal part 140 is formed of a rubber-like elastic body, if it is always in contact with the cover part 122a or the pressing part 130a of the metal pulley 122, a large relative displacement around the pulley is caused when the engine is driven. There was a problem that the lip portion 141 of the rubber-like elastic body was worn early. Further, as a result of wear of the lip portion 141, there is a problem that dust or the like enters from the seal portion 140 when the engine is stopped and the durability of the thrust bearing 131 is lowered. On the other hand, when the engine is driven, there is no possibility that dust or the like will be scattered and infiltrated by centrifugal force due to the rotation of the pulley 122, so that there is no possibility that dust or the like will enter even if the lip portion 141 is not brought into contact with the counterpart member.

  Further, since the radial bearing 132 is provided between the inner peripheral surface of the cylindrical portion 122b of the pulley 122 and the outer peripheral surface of the damper mass 112, a slight gap C2 is also formed between the pulley 122 and the damper mass 112. There is a risk that dust or the like may enter from the gap C2 and reduce the durability of the radial bearing 132. It is necessary to provide a seal portion for sealing the gap C2, and a seal for sealing the gap C2. It was also necessary to suppress early wear for the part.

Japanese Patent Laid-Open No. 2005-133917

  The present invention has been made to solve the above-described problems, and the object of the present invention is to prevent dust and the like that lowers the durability of the bearing from entering through the gap, and to enter. It is an object to provide a rotation fluctuation absorbing damper in which a seal portion of a rubber-like elastic body provided for prevention is not worn at an early stage.

In order to achieve the above object, a rotational fluctuation absorbing damper according to claim 1 of the present invention has a damper mass coaxially disposed on the outer diameter side of a hub attached to the rotating shaft, and a pulley groove on the outer diameter side. A pulley having a cover portion extending radially inward from an end portion of the formed cylindrical portion, a stay fixed to the damper mass, and a coupling rubber laid between the pulley cover portion, is fixed to the damper mass in the outer cover portion, a rotation fluctuation absorbing damper and a stopper portion for regulating the axial position of the coupling rubber, the first lip secured to the cover portion said stopper A rubber-like elastic body first seal portion that is inclined and in close contact with the portion, and / or a rubber-like elastic body second seal portion that is fixed to the damper mass and the second lip portion is inclined and in close contact with the cylindrical portion. And the above Le unit is characterized in that said lip portion is deformed by a centrifugal force during the engine drive is in a non-contact state.
According to a second aspect of the present invention, the rotational fluctuation absorbing damper has a damper mass coaxially disposed on the outer diameter side of the hub attached to the rotating shaft and a pulley groove on the outer diameter side. A pulley having a cover portion extending radially inward from an end portion of the cylindrical portion, a coupling fixed between the stay fixed to the hub and the cover portion of the pulley, and on the outside of the cover portion A rotation fluctuation absorbing damper that is fixed to the hub and includes a stopper portion that regulates an axial position of the coupling rubber, the first lip portion being inclined to the stopper portion. A first seal portion of a rubber-like elastic body that is in close contact, and / or a second seal portion of a rubber-like elastic body that is fixed to the damper mass and in which the second lip portion is inclined and in close contact with the cylindrical portion, and the seal Part is centrifugal when the engine is driven It is characterized in that said lip portion is deformed in a non-contact state by.

  The present invention has the following effects.

According to the rotation fluctuation absorbing damper according to claim 1 or 2 , the first seal portion of the rubber-like elastic body that is fixed to the cover portion and the first lip portion is inclined and closely contacts the stopper portion, and / or the damper mass. A rubber-like elastic second seal portion is disposed in which the second lip portion is inclined and closely contacted with the cylindrical portion, and the disposed seal portion has a lip portion as a counterpart member when the engine is stopped. Since it is in close contact, it is possible to seal dust or the like that tends to enter from the gap formed between the pulley and the stopper portion and / or the gap formed between the damper mass and the pulley. It is possible to prevent the durability of the bearing from being lowered.

  Furthermore, since the seal portion is deformed by centrifugal force when the engine is driven and the lip portion is in a non-contact state with the counterpart member, wear of the lip portion formed of a rubber-like elastic body can be suppressed. Moreover, even if the lip portion is in a non-contact state, dust or the like is scattered by centrifugal force, so that there is no possibility that dust or the like may enter from the gap, and it is possible to prevent the durability of the bearing from being lowered.

  Hereinafter, a preferred first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a main part of a rotational fluctuation absorbing damper according to a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of FIG. 1 when the engine is stopped, and FIG. It is an expanded sectional view of FIG.

  The rotational fluctuation absorbing damper 1 includes a hub 10, a damper mass 20, a pulley 30, a coupling rubber 40, a stopper portion 50, a first seal portion 60, and a second seal portion 70.

  The hub 10 is manufactured by press-molding a metal material, and has an inner diameter cylindrical portion 11 mounted on a crankshaft of an engine that is a rotating shaft, and an outer diameter direction from an end portion of the inner diameter cylindrical portion 11. A radially extending portion 12 and an outside diameter cylindrical portion 13 extending in the axial direction from the outside diameter end portion of the diameter direction portion 12 are integrally formed, and on the outside diameter side of the outside diameter cylindrical portion 13. Is fitted with a cylindrical damper rubber 16 formed of a rubber-like elastic body.

  The damper mass 20 is manufactured by press-molding a metal material, and is formed by integral molding having a substantially U-shaped cross section. The inner diameter cylinder is fitted to the outer diameter side of the damper rubber 16. A portion 21, a radial portion 22 extending in the outer radial direction from the end of the inner cylindrical portion 21, and an outer cylindrical portion 23 extending in the axial direction from the end of the radial portion 22.

  Furthermore, inside the corner portion 24 between the inner diameter cylindrical portion 21 and the radial direction portion 22 of the damper mass 20, a fitting portion 81 fitted to the outer diameter side of the inner diameter cylindrical portion 21, and an outer diameter from the fitting portion 81. A stay 80 including a support portion 82 extending in the direction is disposed, and one end face 41 of the coupling rubber 40 is fixed to the support portion 82.

  The pulley 30 is made of metal and is disposed coaxially with the hub 10 and the damper mass 20, and a cylindrical portion 32 in which a pulley groove 31 around which an endless belt for driving is wound is formed on the outer peripheral surface. And a cover portion 33 extending from the cylindrical portion 32 in the inner diameter direction and to which the other end face 42 of the coupling rubber 40 is fixed. The cover 33 is provided with a recess 34 for restricting the relative amount of twist in the circumferential direction between the hub 10 and the pulley 30. The coupling rubber 40 sandwiched between the cover portion 33 and the support portion 82 of the stay 80 is formed of a rubber-like elastic body so as to absorb the rotational fluctuation of the crankshaft by undergoing torsional deformation in the circumferential direction. It is mounted in a pre-compressed state in the axial direction.

  Further, a radial bearing 17 is provided between the inner peripheral surface of the cylindrical portion 32 of the pulley 30 and the outer peripheral surface of the outer diameter cylindrical portion 23 of the damper mass 20. A gap C <b> 2 is formed between the corner portion 25 with the portion 22 and the cylindrical portion 32 of the pulley 30. The second seal portion 70 seals this gap C2, and the base portion 71 is fixed to the corner portion 25 of the damper mass, and the lip portion 72 is inclined so as to be in close contact with the end surface 35 of the cylindrical portion 32 of the pulley 30. It is arranged.

  The stopper portion 50 is fitted to the outer diameter side of the inner diameter cylindrical portion 21 of the damper mass 20, and the convex portion 51 protruding in the axial direction is engaged with the concave portion 34 provided in the cover portion 33 of the pulley 30. The relative amount of twist in the circumferential direction between the hub 10 and the pulley 30 is regulated. A thrust bearing 18 is provided between the radial end surface 52 of the stopper portion 50 and the cover portion 33, and the stopper portion 50 regulates the axial position of the coupling rubber 40 via the thrust bearing 18. is doing. Further, a gap C1 is formed between the outer diameter side of the stopper portion 50 and the cover portion 33. The first seal portion 60 seals this gap C1, and the base portion 61 is the pulley 30. The lip portion 62 is inclined so as to be in close contact with the axial end surface 53 of the stopper portion 50.

  The rotation fluctuation absorbing damper 1 according to the first embodiment having the above-described configuration has a first seal portion 60 in which the base portion 61 is fixed to the cover portion 33 of the pulley 30 as shown in FIG. 2 when the engine is stopped. Since the lip portion 62 is inclined and in close contact with the axial end surface 53 of the stopper portion 50, the gap C <b> 1 is sealed to prevent entry of dust and the like, and is provided between the stopper portion 50 and the cover portion 33. It is possible to prevent the durability of the thrust bearing 18 from being lowered. Further, since the lip portion 72 of the second seal portion 70 where the base portion 71 is fixed to the corner portion 25 of the damper mass 20 is inclined and in close contact with the end surface 35 of the cylindrical portion 32 of the pulley 30, the gap C2 is sealed. Intrusion of dust or the like is prevented, and the durability of the radial bearing 17 provided between the outer peripheral surface of the outer diameter cylindrical portion 23 of the damper mass 20 and the inner peripheral surface of the cylindrical portion 32 of the pulley 30 is reduced. It is possible to prevent.

  Further, when the engine is driven, dust and the like are scattered by the centrifugal force, so there is no need to seal the gaps C1 and C2. Therefore, as shown in FIG. 3, the first seal portion 60 is deformed by the centrifugal force and the lip portion 62 is Since the second seal portion 70 is deformed and the lip portion 72 is not in contact with the end surface 35 of the cylindrical portion 32 of the pulley 30 while being in a non-contact state with the axial end surface 53 of the stopper portion 50, the rubber-like elastic body is used. To suppress wear of the lip portion 62 of the molded first seal portion 60 and the lip portion 72 of the second seal portion 70 and prevent the life of the first seal portion 60 and the second seal portion 70 from being reduced. Is possible.

  Next, a preferred second embodiment of the present invention will be described as an example.

  As shown in FIGS. 4 and 5, the rotational fluctuation absorbing damper 1 in the second embodiment includes the hub 10, the damper mass 20, the pulley 30, the coupling rubber 40, and the stopper portion 50 as in the first embodiment. Although the 1st seal | sticker part 60 and the 2nd seal | sticker part 70 are provided, the support method of the coupling rubber 40 differs from 1st embodiment. That is, the stay 80 having the support portion 82 fixed to the one end surface 41 of the coupling rubber 40 is directly coupled to the hub 10 and the pulley 30 fixed to the other end surface 42 of the coupling rubber 40. A stopper portion 50 having a pressing portion 54 that restricts the axial position of the cover portion 33 is also directly coupled to the hub 10.

  However, as in the first embodiment, the thrust bearing 18 is provided between the pressing portion 54 of the stopper portion 50 and the cover portion 33, and there is a gap between the pressing portion 54 of the stopper portion 50 and the cover portion 33. C1 is formed. The first seal portion 60 seals the gap C1, and the base portion 61 is fixed to the cover portion 33 of the pulley 30, the lip portion 62 is inclined, and the axial end surface 53 of the pressing portion 54 of the stopper portion 50 is provided. It arrange | positions so that it may closely contact.

  As in the first embodiment, the damper mass 20 is fitted to the cylindrical portion 13 of the hub 10 via the damper rubber 16, and the outer peripheral surface of the damper mass 20 and the inner peripheral surface of the cylindrical portion 32 of the pulley 30. A radial bearing 17 is provided therebetween, and a gap C <b> 2 is formed between the outer peripheral surface of the damper mass 20 and the cylindrical portion 32 of the pulley 30. The second seal portion 70 seals the gap C2, and the base portion 71 is fixed to the outer peripheral surface of the damper mass 20, and the lip portion 72 is inclined so as to be in close contact with the end surface 35 of the cylindrical portion 32 of the pulley 30. It is arranged.

  Similarly to the first embodiment, the rotational fluctuation absorbing damper 1 according to the second embodiment having the above-described configuration also has the lip portion 62 of the first seal portion 60 of the stopper portion 50 as shown in FIG. The thrust bearing 18 provided between the stopper portion 50 and the cover portion 33 is sealed by sealing the gap C1 to prevent intrusion of dust and the like because it is inclined and in close contact with the axial end surface 53 of the pressing portion 54. It is possible to prevent the durability of the steel from being lowered. Further, since the lip portion 72 of the second seal portion 70 is in contact with the end face 35 of the cylindrical portion 32 of the pulley 30, the gap C <b> 2 is sealed to prevent entry of dust and the like, and the outer peripheral surface of the damper mass 20. And the durability of the radial bearing 17 provided between the inner peripheral surface of the cylindrical portion 32 of the pulley 30 can be prevented from decreasing.

  Further, when the engine is driven, dust and the like are scattered by the centrifugal force, so there is no need to seal the gaps C1 and C2. Therefore, as shown in FIG. 5, the first seal portion 60 is deformed by the centrifugal force and the lip portion 62 is Since the second seal portion 70 is deformed and the lip portion 72 is not in contact with the pulley 30 while being in a non-contact state with the stopper portion 50, the lip portion of the first seal portion 60 formed of a rubber-like elastic body. It is possible to suppress the wear of the lip portion 72 of the second seal portion 62 and the second seal portion 70 and prevent the life of the first seal portion 60 and the second seal portion 70 from being reduced.

  In the present embodiment, the case where the first seal portion 60 and the second seal portion 70 are disposed has been described. However, only one of the seal portions may be disposed.

Sectional drawing of the principal part of the rotation fluctuation absorption damper which concerns on 1st embodiment of this invention. 1 is an enlarged sectional view of FIG. 1 when the engine is stopped. 1 is an enlarged sectional view of FIG. 1 when the engine is driven. The expanded sectional view at the time of an engine stop of the rotation fluctuation absorption damper concerning a second embodiment of the present invention. The expanded sectional view at the time of engine drive of the rotation fluctuation absorption damper concerning a second embodiment of the present invention. Sectional view of the main part of a conventional rotational fluctuation absorbing damper

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotation fluctuation absorption damper 10 Hub 11, 13, 21, 23, 32 Cylindrical part 12, 22 Radial direction part 16 Damper rubber | gum 17, 18 Bearing 20 Damper mass 24, 25 Corner | angular part 30 Pulley 31 Pulley groove 33 Cover part 34 Recessed part 35, 52 , 53 End face 40 Coupling rubber 50 Stopper part 51 Protruding part 60, 70 Seal part 61, 71 Base part 62, 72 Lip part 80 Stay 81 Fitting part 82 Support part C1, C2 Gap

Claims (2)

A damper mass arranged coaxially on the outer diameter side of the hub attached to the rotating shaft, and a cover portion extending radially inward from the end of the cylindrical portion in which the pulley groove is formed on the outer diameter side A pulley having a coupling rubber stretched between a stay fixed to the damper mass and a cover portion of the pulley, and fixed to the damper mass outside the cover portion, and the axial position of the coupling rubber is A rotational fluctuation absorbing damper having a stopper portion to regulate ,
The first seal portion of the rubber-like elastic body that is fixed to the cover portion and the first lip portion is inclined and closely contacts the stopper portion, and / or the second lip portion is inclined to the cylindrical portion and fixed to the damper mass. Arranging the second seal part of the rubber-like elastic body in close contact,
The rotational fluctuation absorbing damper, wherein the seal portion is deformed by a centrifugal force when the engine is driven and the lip portion is in a non-contact state. A damper mass arranged coaxially on the outer diameter side of the hub attached to the rotating shaft, and a cover portion extending radially inward from the end of the cylindrical portion in which the pulley groove is formed on the outer diameter side A pulley having a pulley, a stay fixed to the hub, and a coupling rubber installed between the cover portion of the pulley, and fixed to the hub outside the cover portion, the axial position of the coupling rubber being A rotational fluctuation absorbing damper having a stopper portion to regulate,
The first seal portion of the rubber-like elastic body that is fixed to the cover portion and the first lip portion is inclined and closely contacts the stopper portion, and / or the second lip portion is inclined to the cylindrical portion and fixed to the damper mass. Arranging the second seal part of the rubber-like elastic body in close contact,
The rotational fluctuation absorbing damper, wherein the seal portion is deformed by a centrifugal force when the engine is driven and the lip portion is in a non-contact state.

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