JP6640179B2 - Clutch device for internal combustion engine - Google Patents

Description

The present invention is configured such that a cylindrical portion coaxial with a rotating shaft and an end wall portion closing one end of the cylindrical portion are integrally formed into a bottomed cylindrical shape, and rotational power from a crankshaft is input. A clutch outer that is rotatably supported by the rotating shaft, a clutch inner that is disposed radially inward of the clutch outer and is coupled to the rotating shaft so as to be relatively non-rotatable, A plurality of first clutch plates that are movably and non-rotatably connected, and a plurality of second clutch plates that are axially relatively movably and non-rotatably connected to the clutch inner; off the barrier disconnection state corresponding to the input cancellation of the connection state and the pressing force corresponding to the input of the pressing force for causing friction transmitted to the first clutch plate and the second clutch plates A multi-plate clutch mechanism; and a centrifugal clutch mechanism capable of switching between input and release of pressing force to the multi-plate clutch mechanism in accordance with the number of rotations of the rotational power transmitted from the crankshaft. The present invention relates to a clutch device for an internal combustion engine.

  In the clutch outer of the multi-plate clutch mechanism, a centrifugal weight guided by a groove formed on the inner surface of the clutch outer is arranged, and a clutch device in which the clutch outer is shared by the multi-plate clutch mechanism and the centrifugal clutch outer mechanism is provided. And already known in US Pat.

JP-A-2017-62048

  However, in the clutch device disclosed in Patent Literature 1, the size of the centrifugal weight of the centrifugal clutch is changed when an attempt is made to change the rotation speed of the crankshaft for switching between the connected state and the disconnected state of the multi-plate clutch mechanism. It is necessary to increase the centrifugal weight, especially when it is desired to connect the multi-plate clutch mechanism at a lower rotation speed, so that the clutch outer common to the multi-plate clutch mechanism and the centrifugal clutch outer mechanism is increased in size. As a result, the size of the clutch device increases.

The present invention has been made in view of such circumstances, the multi-plate clutch in outer clutch mechanism on housing the centrifugal clutch mechanism, the centrifugal weight the timing of switching the connection state and disconnection state of the multi-plate clutch mechanism An object of the present invention is to provide a clutch device for an internal combustion engine that can be set regardless of the size.

  In order to achieve the above object, the present invention has a cylindrical portion coaxial with a rotation axis and an end wall portion closing one end of the cylindrical portion, which is integrally formed with a bottomed cylindrical shape, and which is formed from a crankshaft. A clutch outer that is rotatably supported on the rotating shaft so that rotational power is input, and a clutch inner that is disposed radially inward of the clutch outer and is coupled to the rotating shaft so as to be relatively non-rotatable. A plurality of first clutch plates connected to the clutch outer so as to be axially relatively movable and non-rotatable, and a plurality of second clutch plates connected to the clutch inner so as to be axially movable and relatively non-rotatable. And a connection state according to an input of a pressing force for generating friction transmission between the first clutch plate and the second clutch plate, and an input of the pressing force. A multi-plate clutch mechanism capable of switching a disconnection state in accordance with the release; and a switchable input and release of a pressing force to the multi-plate clutch mechanism in accordance with the rotational speed of the rotational power transmitted from the crankshaft. And a centrifugal clutch mechanism, wherein the centrifugal clutch mechanism is formed separately from the clutch outer and is housed in the clutch outer between the end wall and the clutch inner. A centrifugal clutch outer, a plurality of centrifugal weights that are capable of moving the centrifugal clutch outer in a radial direction and are held inside the centrifugal clutch outer, and are disposed at positions sandwiching the centrifugal weight between the centrifugal clutch outer. And the centrifugal weight moves outward in the radial direction of the centrifugal clutch. A movable holding member that moves in the axial direction to switch between inputting and releasing input of the pressing force to the multi-plate clutch mechanism, wherein a first power transmission mechanism provided between the crankshaft and the clutch outer has a reduction ratio. The first feature is that a second power transmission mechanism, which is set differently, is provided between the crankshaft and the centrifugal clutch outer.

  Further, in addition to the configuration of the first feature, the present invention further includes a first drive gear that forms a part of the first power transmission mechanism, and a first drive gear that forms a part of the second power transmission mechanism. A second feature is that a second drive gear having a larger diameter than the gear is provided on the crankshaft.

  The present invention provides, in addition to the configuration of the first or second aspect, the multi-plate clutch mechanism according to an axial movement of the movable holding member in response to an outward movement of the centrifugal weight along the radial direction. An interlocking pressing member that is supported by the clutch inner so as to move to the side where the pressing force is input, and the interlocking pressing by exerting an elastic force that presses the movable holding member toward the centrifugal clutch outer side. A third feature is to include a member and an elastic member interposed between the clutch inners.

  The present invention provides, in addition to any one of the first to third features, the centrifugal clutch which constitutes a part of the second power transmission mechanism and penetrates the clutch outer coaxially and relatively rotatably. A fourth feature is that a cylindrical transmission tube coupled to the outer so as to be incapable of relative axial movement and relative rotation is rotatably supported on the rotation shaft while coaxially surrounding the rotation shaft. I do.

  According to the present invention, in addition to the configuration of the fourth feature, a cylindrical collar is interposed between the transmission cylinder and the rotation shaft, and the rotation shaft has a first oil passage extending in parallel with the rotation shaft; A second oil passage extending in a direction perpendicular to the axis of the rotation shaft while opening an outer end at an outer periphery of the rotation shaft and communicating an inner end to the first oil passage, and provided in the second oil passage; A fifth feature is that a third oil passage that communicates one end and opens the other end to the outer periphery of the transmission cylinder is provided in the collar and the transmission cylinder.

Further, in addition to the configuration of the fourth or fifth aspect, the present invention constitutes a part of a second power transmission mechanism provided on the crankshaft , meshes with the second drive gear, and is fixed to the transmission cylinder. In the projection view onto a plane orthogonal to the axis of the rotating shaft, the outer periphery of the driven gear provided is arranged so as to overlap the centrifugal weight when the centrifugal clutch mechanism is in a non-operating state. 6.

  According to the first feature of the present invention, a speed reduction ratio between the centrifugal clutch outer and the crankshaft of the centrifugal clutch mechanism is different from that of the first power transmission mechanism provided between the clutch outer and the crankshaft of the multi-plate clutch mechanism. Since two power transmission mechanisms are provided, the timing of switching between the connected state and the disconnected state of the multiple disc clutch mechanism can be set regardless of the size of the centrifugal weight in the centrifugal clutch mechanism.

  Further, according to the second aspect of the present invention, since the second drive gear having a larger diameter than the first drive gear constituting a part of the first power transmission mechanism is provided on the crankshaft, the input to the centrifugal clutch mechanism is provided. The rotation speed of the rotation power to be applied is increased from the rotation speed of the rotation power input to the clutch outer of the multi-plate clutch mechanism, so that the centrifugal force applied to the centrifugal weight is easily increased, thereby reducing the size of the centrifugal weight. The centrifugal clutch mechanism, and thus the entire clutch device, can be easily reduced in size.

  According to the third feature of the present invention, the elastic member which exerts a resilient force for pressing the movable holding member toward the outer side of the centrifugal clutch is provided between the interlocking pressing member capable of inputting the pressing force to the multi-plate clutch mechanism and the clutch inner. , The centrifugal weight can be pressed against and held against the outer side of the centrifugal clutch, and the vibration of the interlocking pressing member can be suppressed.

  According to the fourth aspect of the present invention, the cylindrical power transmission tube which forms a part of the second power transmission mechanism penetrates the clutch outer coaxially and relatively rotatably to move axially relative to the centrifugal clutch outer. And the relative rotation is disabled, so that the second power transmission mechanism that transmits power from the crankshaft to the outer centrifugal clutch can be simply configured.

  According to a fifth aspect of the present invention, a first oil passage extending parallel to the rotation axis and a second oil passage extending in a direction perpendicular to the axis of the rotation shaft and communicating the inner end to the first oil passage are provided. Is provided on the rotating shaft, and a third oil passage that communicates one end to the second oil passage and opens the other end to the outer periphery of the transmission cylinder is provided with a cylindrical collar and transmission that are interposed between the transmission cylinder and the rotation shaft. Since it is provided in the cylinder, it is possible to efficiently supply oil to a portion where friction occurs due to a difference in rotation speed between the transmission cylinder and the rotating shaft.

  Further, according to the sixth aspect of the present invention, the outer periphery of the driven gear, which forms a part of the second power transmission mechanism and is fixed to the transmission cylinder, is projected on a plane orthogonal to the axis of the rotating shaft. Therefore, since the centrifugal weight overlaps with the centrifugal weight when the centrifugal clutch mechanism is in the non-operating state, the diameter of the driven gear can be reduced, and the rotational speed of the rotational power input to the centrifugal clutch mechanism can be further increased.

It is a longitudinal section of a clutch device of an internal-combustion engine. Is a interior view viewed centrifugal clutch outer from the multiple disc clutch device構側.

  An embodiment of the present invention will be described with reference to FIGS. 1 and 2 attached. First, in FIG. 1, a crankshaft 6 rotatably supported by a crankcase 5 of an internal combustion engine, and Between the rotating shaft 8 rotatably supported by the crankcase 5 while having an axis parallel to the axis of the crankshaft 6 so as to function as an input shaft of the gear transmission 7 to be accommodated. A clutch device 9 according to the invention is provided.

  The clutch device 9 includes a multi-plate clutch mechanism 10 and a centrifugal switch that can switch between input and release of a pressing force to the multi-plate clutch mechanism 10 in accordance with the number of rotations of the rotational power transmitted from the crankshaft 6. A clutch mechanism 11 is provided, and the multi-plate clutch mechanism 10 can switch between a connection state according to the input of the pressing force from the centrifugal clutch mechanism 11 and a cutoff state according to the release of the input of the pressing force.

  The multi-plate clutch mechanism 10 includes a clutch outer 12, a clutch inner 13 disposed radially inward of the clutch outer 12 and coupled to the rotating shaft 8 so as to be relatively non-rotatable. A plurality of first clutch plates 14 connected to the clutch inner 13 so as to be relatively movable and non-rotatable, and a plurality of second clutch plates 15 connected to the clutch inner 13 so as to be axially relatively movable and non-rotatable. Having.

  The clutch outer 12 is integrally formed with a cylindrical portion 12a coaxial with the rotating shaft 8 and an end wall portion 12b closing one end of the cylindrical portion 12a. The rotary shaft 8 is rotatably supported by the rotary shaft 8 so that rotary power from the shaft 6 is input.

  The clutch inner 13 includes a clutch center 16 that is non-rotatably connected to the rotation shaft 8, and a pressing member that is connected to the clutch center 16 so as to be relatively non-rotatable while enabling relative axial movement with respect to the clutch center 16. 17. The clutch center 16 includes a cylindrical boss portion 16a spline-coupled to the rotating shaft 8 while surrounding the rotating shaft 8, and a protrusion extending radially outward from an axially outer end of the boss portion 16a. It is formed so as to have the portion 16b integrally.

  The pressing member 17 has a cylindrical support tube portion 17a which is slidably fitted to the boss portion 16a of the clutch center 16 and is supported by the boss portion 16a so as to be movable in the axial direction. And a plurality of flanges 17b which are opposed to the overhang portion 16b of the support cylinder portion 17a from the axially outer end of the support cylindrical portion 17a and radially outward from the axially outer end of the support tubular portion 17a. Each of the first and second clutch plates 14 and 15 is connected to the outer periphery of the flange portion 17b so as to face the innermost in the axial direction, for example, the first clutch plate 14 from the inner side in the axial direction. A ring-shaped pressing plate portion 17c and a connecting shaft connected at right angles to a plurality of circumferentially spaced portions of the flange portion 17b so as to movably penetrate the projecting portion 16b of the clutch center 16. And 17d are formed so as to have integrally.

  Of the plurality of first and second clutch plates 14 and 15 arranged in a mutually overlapping manner, a retaining ring 18 facing the first clutch plate 14 disposed at the outermost side in the axial direction from the outer side in the axial direction. A plurality of first and second clutches each of which is attached to an inner periphery of an outer end in the axial direction of the cylindrical portion 12a of the clutch outer 12 and is pressed by the pressing plate portion 17c of the clutch inner 13; When the plates 14 and 15 are sandwiched between the pressing plate portion 17c and the retaining ring 18, friction is transmitted between the first clutch plate 14 and the second clutch plate 15, and a multi-plate clutch mechanism is provided. 10 is connected.

  A lifter plate 19 is fastened to the outer end of the connecting shaft 17d of the clutch center 16 by a screw member 20. The inner periphery of the lifter plate 19 is supported by a bearing holder 22 via a ball bearing 21, and the lifter plate 19 operates according to an axial operation of a cylindrical operating member 23 connected to the bearing holder 22. Thus, when the pressing plate portion 17c, that is, the pressing member 17 is moved in the axial direction to the side where the friction transmission of the first and second clutch plates 14 and 15 is released, the multi-plate clutch mechanism 10 is moved. It becomes a cutoff state.

  The centrifugal clutch mechanism 11 is formed separately from the clutch outer 12 and is accommodated in the clutch outer 12 between the end wall 12 b of the clutch outer 12 and the clutch inner 13. And a plurality of spherical centrifugal weights 26 that can move the centrifugal clutch outer 25 in the radial direction and are held inside the centrifugal clutch outer 25, and the centrifugal weight 26 between the centrifugal clutch outer 25. A shaft which is arranged at a sandwiching position and switches between inputting and releasing input of the pressing force to the multi-plate clutch mechanism 10 in accordance with the movement of the centrifugal weight 26 outward in the radial direction of the centrifugal clutch outer 25. And a movable holding member 27 that moves in the direction.

  Referring also to FIG. 2, the centrifugal clutch outer 25 is a ring plate-shaped flat plate portion 25a, and the clutch inner of the multi-plate clutch mechanism 10 is connected at right angles to a radially outer end of the flat plate portion 25a. 13, a tapered portion 25c having a smaller diameter at the radially outer end of the flat plate portion 25a and having a larger diameter toward the clutch inner 13; The inner cylindrical portion 25b and the outer cylindrical portion 25d are formed so as to integrally have an outer cylindrical portion 25d connected to the outer diameter end of the inner cylindrical portion 25c.

  On the inner surface of the centrifugal clutch outer 25, a plurality of guide grooves 28 are formed in the tapered portion 25c and the outer cylindrical portion 25d so as to radially extend so that the inner end in the radial direction is closed by the inner cylindrical portion 25b. The centrifugal weight 26 moves in the radial direction on the inner surface of the centrifugal clutch outer 25 in response to the action of the centrifugal force while being guided by the guide grooves 28.

Wherein in the said clutch outer 12 of the multi-plate clutch mechanism 10, the are those rotational power from the crankshaft 6 is transmitted through the first power transmission mechanism 30, the first power transmission mechanism 3 0, the A first drive gear 32 provided on the crankshaft 6 and a first driven gear 33 connected to the clutch outer 12 via a damper rubber 34 and a damper spring 35 are provided.

  A first thrust bearing 36 is interposed between the end wall 12 b of the clutch outer 12, the first driven gear 33, and the centrifugal clutch outer 25.

The rotational power from the crankshaft 6 is applied to the centrifugal clutch outer 25 of the centrifugal clutch mechanism 11 via a second power transmission mechanism 31 having a different reduction ratio from the first power transmission mechanism 30. The second power transmission mechanism 31 includes a second drive gear 37 fixedly provided on the crankshaft 6 so as to be adjacent to the first drive gear 32 on the inner side in the axial direction, It includes a second driven gear 38 meshing with the second drive gear 3 7, and a cylindrical transmission cylinder 39 that is relatively non-rotatably coupled by sintering or press-fitted into the inner periphery of the second driven gear 38.

  A needle bearing 40 is interposed between the transmission cylinder 39 and the clutch outer 12, and an annular protrusion 39 a integrally provided on an outer periphery of an intermediate portion of the transmission cylinder 39 is formed inside the flat plate portion 25 a of the centrifugal clutch outer 25. Welded to the periphery.

  The second drive gear 37 is formed to have a larger diameter than the first drive gear 32, and the second driven gear 38 is configured such that the outer periphery of the second driven gear 38 is directed to a plane perpendicular to the axis of the rotating shaft 8. In FIG. 1 (on FIG. 1), the centrifugal clutch mechanism 11 is formed to have a smaller diameter than the first driven gear 33 so as to overlap with the centrifugal weight 26 when the centrifugal clutch mechanism 11 is in a non-operating state. . That is, in FIG. 1, a straight line L extending in parallel with the axis of the rotating shaft 8 through the outer periphery of the second driven gear 38 passes through the centrifugal weight 26 when the centrifugal clutch mechanism 11 is in a non-operating state. . As a result, the rotational speed of the rotational power input from the crankshaft 6 to the centrifugal clutch mechanism 11 is further increased.

A cylindrical collar 49 is coaxially inserted between the transmission cylinder 39 and the rotary shaft 8, and is interposed between one end of the collar 49 and the rotary shaft 8 and the crankcase 5. A ring-shaped spacer 50 is interposed between the ball bearing 48 and the inner race 48a. The other end of the collar 49 is abutting on the boss portion 1 6 a of the clutch center 1 6, abuts against the outer end of the boss portion 1 6 a, engage the rotary shaft 8 by tightening the nut 51 screwed to the spacer 50, the collar 49 and the boss portion 1 6 a is fixed to the rotary shaft 8.

  The movable holding member 27 is configured such that the inner peripheral portion is engaged with the transmission cylinder 39 while the outer peripheral portion is engaged with a portion of the guide groove 28 formed on the inner surface of the outer cylindrical portion 25 d of the centrifugal clutch outer 25. And is slidably supported in the axial direction.

  The support cylindrical portion 17a of the pressing member 17 in the clutch inner 13 has the multi-layer according to the axial movement of the movable holding member 27 in accordance with the outward movement of the centrifugal weight 26 along the radial direction. The interlocking pressing member 41 that moves to the side where the pressing force is input to the plate clutch mechanism 10 is supported to be slidable in the axial direction while making relative rotation impossible. A second thrust bearing 42 is interposed between the interlocking pressing member 41 and the movable holding member 27.

  A disc spring 43 as an elastic member is interposed between the interlocking pressing member 41 and the flange portion 17b of the pressing member 17 in the clutch inner 13, and the disc spring 43 is provided with the movable holding member. It exerts an elastic force to press the member 27 toward the outer side of the centrifugal clutch 25. In addition, a stop that engages with the interlocking pressing member 41 and restricts a moving end of the interlocking pressing member 41 toward the centrifugal clutch outer 25 side is provided on an outer periphery of an end portion of the support cylinder portion 17a on the movable holding member 27 side. The wheel 44 is mounted.

  The rotary shaft 8 is provided with a first oil passage 45 extending in parallel with the axis of the rotary shaft 8, and in this embodiment, coaxially with the axis. A second oil passage 46 extending in a direction perpendicular to the axis of the rotating shaft 8 and communicating the inner end with the first oil passage 45 is provided, and a part of the second oil passage 46 It is composed of an annular recess 46a formed on the outer periphery.

The collar 49 and the transmission cylinder 39 are provided with a third oil passage 47 having one end communicating with the second oil passage 46 and opening the other end on the outer periphery of the transmission cylinder 39. A part of 47 is constituted by an annular concave portion 47a formed on the outer periphery of the collar 49 .

  Next, the operation of this embodiment will be described. A centrifugal clutch mechanism capable of switching between inputting and releasing input of the pressing force to the multi-plate clutch mechanism 10 in accordance with the number of rotations of the rotational power transmitted from the crankshaft 6. A centrifugal clutch outer 25 is formed separately from the clutch outer 12 of the multi-plate clutch mechanism 10 and is housed in the clutch outer 12 between the end wall 12b of the clutch outer 12 and the clutch inner 13. A plurality of centrifugal weights 26 which are capable of moving the centrifugal clutch outer 25 in the radial direction and are held inside the centrifugal clutch outer 25; and a position where the centrifugal weight 26 is sandwiched between the centrifugal clutch outer 25. The centrifugal weight is disposed outwardly along the radial direction of the centrifugal clutch outer 25. A movable holding member 27 that moves in the axial direction to switch between input and release of the pressing force to the multi-plate clutch mechanism 10 in accordance with the movement of the clutch 6, and between the crankshaft 6 and the clutch outer 12. Is provided between the crankshaft 6 and the centrifugal clutch outer 25 because the second power transmission mechanism 31 having a reduction ratio different from that of the first power transmission mechanism 30 provided in the first power transmission mechanism 30 is connected to the multi-plate clutch mechanism 10. The timing for switching between the state and the cutoff state can be set regardless of the size of the centrifugal weight 26 in the centrifugal clutch mechanism 11.

  A first drive gear 32 forming a part of the first power transmission mechanism 30 and a second drive gear forming a part of the second power transmission mechanism 31 and having a larger diameter than the first drive gear 32. Since the two drive gears 37 are provided on the crankshaft 6, the rotational speed of the rotational power input to the centrifugal clutch mechanism 11 is greater than the rotational speed of the rotational power input to the clutch outer 12 of the multi-plate clutch mechanism 10. As a result, the centrifugal force applied to the centrifugal weight 26 can be easily increased, whereby the centrifugal weight 26 can be reduced in size, and the centrifugal clutch mechanism 11 and thus the entire clutch device 9 can be easily reduced in size.

  Also, an interlocking pressing member that moves to the side for inputting pressing force to the multi-plate clutch mechanism 10 in accordance with the axial movement of the movable holding member 27 in accordance with the outward movement of the centrifugal weight 26 along the radial direction. 41 is supported by the clutch inner 13, and a disc spring 43 is provided between the interlocking pressing member 41 and the clutch inner 13 to exert a resilient force for pressing the movable holding member 27 toward the centrifugal clutch outer 25. Therefore, the centrifugal weight 26 can be pressed against the centrifugal clutch outer 25 and held, and the vibration of the interlocking pressing member 41 can be suppressed.

  Further, a cylinder which constitutes a part of the second power transmission mechanism 31 and is coaxially and relatively rotatably penetrated through the clutch outer 12 and coupled to the centrifugal clutch outer 25 so as to be incapable of relative axial movement and relative rotation. Power transmission cylinder 39 is rotatably supported by the rotary shaft 8 while coaxially surrounding the rotary shaft 8, so that the second power transmission for transmitting power from the crankshaft 6 to the outer centrifugal clutch 25. The mechanism 31 can be configured simply.

  Further, a cylindrical collar 49 is interposed between the transmission cylinder 39 and the rotation shaft 8, a first oil passage 45 extending in parallel with the rotation shaft 8, and an outer periphery of the rotation shaft 8. A second oil passage 46 extending in a direction perpendicular to the axis of the rotary shaft 8 while opening an outer end and communicating the inner end to the first oil passage 45 is provided, and one end of the second oil passage 46 is connected to the second oil passage 46. Since the collar 49 and the transmission cylinder 39 are provided with the third oil passage 47 that communicates and opens the other end to the outer periphery of the transmission cylinder 39, friction due to different rotation speeds of the transmission cylinder 39 and the rotating shaft 8 is provided. Can be efficiently refueled.

  Further, the outer periphery of a second driven gear 38 which is a part of the second power transmission mechanism 31 and meshes with the second drive gear 37 and is fixed to the transmission cylinder 39 is aligned with the axis of the rotary shaft 8. Since the centrifugal clutch mechanism 11 is disposed so as to overlap with the centrifugal weight 26 when the centrifugal clutch mechanism 11 is in a non-operating state on a projection view on an orthogonal plane, the diameter of the second driven gear 38 is reduced, and the centrifugal clutch mechanism 11 Can be further increased.

  The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

Reference Signs List 6 crankshaft 8 rotating shaft 9 clutch device 10 multi-plate clutch mechanism 11 centrifugal clutch mechanism 12 clutch outer 12a cylindrical part 12b end Wall portion 13 Clutch inner 14 First clutch plate 15 Second clutch plate 25 Centrifugal clutch outer 26 Centrifugal weight 27 Movable holding member 30 1st power transmission mechanism 31 2nd power transmission mechanism 32 1st drive gear 37 2nd drive gear 38 2nd driven gear 39 which is a driven gear .. the interlocking pressing member 43... The disc spring 45 as an elastic member. The first oil passage 46 the second oil passage 47 the third oil passage 49.

Claims (6)

A cylindrical portion (12a) coaxial with the rotating shaft (8) and an end wall portion (12b) for closing one end of the cylindrical portion (12a) are integrally formed into a bottomed cylindrical shape and a crankshaft (6). ), A clutch outer (12) rotatably supported by the rotating shaft (8) so as to receive the rotational power from the clutch outer (12); A clutch inner (13) coupled to the shaft (8) so as to be relatively non-rotatable; and a plurality of first clutch plates (14) coupled to the clutch outer (12) so as to be axially relatively movable and non-rotatable. And a plurality of second clutch plates (15) connected to the clutch inner (13) so as to be axially relatively movable and relatively non-rotatable, and the first clutch plate (14) and the second clutch plate (15). 2 clutches (15) the multi-disc clutch mechanism capable of switching the cutoff state according to the connection state and the input release of the pressing force corresponding to the input of the pressing force for generating a friction transmission between the (10);
A centrifugal clutch mechanism (11) capable of switching between input and release of pressing force to the multi-plate clutch mechanism (10) in accordance with the number of rotations of rotational power transmitted from the crankshaft (6);
In a clutch device for an internal combustion engine including
The centrifugal clutch mechanism (11) is formed separately from the clutch outer (12) and is housed in the clutch outer (12) between the end wall (12b) and the clutch inner (13). A centrifugal clutch outer (25), a plurality of centrifugal weights (26) held inside the centrifugal clutch outer (25) so as to enable the centrifugal clutch outer (25) to move in the radial direction, and the centrifugal clutch. The centrifugal weight (26) is arranged at a position sandwiching the centrifugal weight (26) between the centrifugal weight (26) and the outer centrifugal clutch (25). A movable holding member (27) that moves in the axial direction to switch between inputting and releasing input of the pressing force to the multi-plate clutch mechanism (10); A second power transmission mechanism (31) having a reduction ratio different from that of the first power transmission mechanism (30) provided between the crankshaft (6) and the clutch outer (12). A clutch device for an internal combustion engine, which is provided between the centrifugal clutch outer (25).   A first drive gear (32) forming a part of the first power transmission mechanism (30) and a first drive gear (32) forming a part of the second power transmission mechanism (31); The clutch device for an internal combustion engine according to claim 1, wherein a second drive gear (37) having a large diameter is provided on the crankshaft (6).   To the side for inputting the pressing force to the multi-plate clutch mechanism (10) in accordance with the axial movement of the movable holding member (27) in accordance with the outward movement of the centrifugal weight (26) in the radial direction. An interlocking pressing member (41) supported by the clutch inner (13) so as to move, and a resilient force for pressing the movable holding member (27) toward the centrifugal clutch outer (25). The clutch device for an internal combustion engine according to claim 1 or 2, further comprising an elastic member (43) interposed between the interlocking pressing member (41) and the clutch inner (13).   It constitutes a part of the second power transmission mechanism (31) and penetrates the clutch outer (12) coaxially and relatively rotatably so that the centrifugal clutch outer (25) cannot perform relative axial movement and relative rotation. A cylindrical transmission cylinder (39), which is connected as a shaft, is rotatably supported on the rotating shaft (8) while surrounding the rotating shaft (8) coaxially. 4. The clutch device for an internal combustion engine according to claim 3. A cylindrical collar (49) is interposed between the transmission cylinder (39) and the rotation shaft (8), and a first oil passage () extending parallel to the rotation shaft (8) is provided on the rotation shaft (8). 45) and a second opening extending outside in the outer periphery of the rotating shaft (8) in a direction perpendicular to the axis of the rotating shaft (8) to communicate the inner end to the first oil passage (45). An oil passage (46) is provided, and a third oil passage (47) having one end communicating with the second oil passage (46) and having the other end open to the outer periphery of the transmission cylinder (39) is provided with the collar ( 49. The clutch device for an internal combustion engine according to claim 4, wherein the clutch device is provided on the transmission cylinder (39).
A part of the second power transmission mechanism (31), the driven gear (39) meshed with a second drive gear (37) provided on the crankshaft (6 ) and fixed to the transmission cylinder (39). The outer periphery of 38) overlaps the centrifugal weight (26) when the centrifugal clutch mechanism (11) is in a non-operating state on a projection on a plane orthogonal to the axis of the rotating shaft (8). The clutch device for an internal combustion engine according to claim 4, wherein the clutch device is disposed.

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