JP2014081008A - Structure of output portion of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a dead space by reducing a working space V to make through holes 66 for fastening an adjacent drive plate 5 to a torque converter 4, on a fly wheel 6, as narrow as possible.SOLUTION: A plurality of fastening members (bolts 7) to a torque converter 4, are arranged on a part near an outer periphery of a drive plate 5 at intervals in the circumferential direction. A fly wheel 6 mounted on an output shaft (crank shaft 2) is provided with a plurality of through holes 66 for fastening work respectively corresponding to each of the plurality of fastening members, and the through holes 66 are slots long in the radial direction of the fly wheel 6.

Description

  The present invention relates to a structure of an output portion that transmits rotation of an output shaft of an internal combustion engine to a transmission, and more particularly to a structure of a flywheel attached to an end portion of the output shaft.

  In general, a flywheel or a drive plate is attached to an end portion of an output shaft of an internal combustion engine (hereinafter also referred to as an engine) so as to transmit the rotation output to a transmission. In the case of an automatic transmission, torque fluctuations can be absorbed by the torque converter, so a relatively lightweight drive plate is used and its central part is fastened to the end of the output shaft, while the outer peripheral part is fastened to the torque converter. Is done.

  As an example, in the engine described in Patent Document 1, a drive plate is attached to an end portion of a crankshaft (output shaft), and a starting plate is disposed on the opposite side of the drive plate from the torque converter. The starter plate is attached to the end of the crankshaft via a one-way clutch, and a ring gear is formed on the outer periphery of the starter plate so that the starter motor pinion is always engaged.

  The starting plate is formed with a round hole for fastening a bolt for fastening the adjacent drive plate to the torque converter. That is, a plurality of bolts are arranged at intervals in the circumferential direction at a portion near the outer periphery of the drive plate, and the starting plate has a round hole slightly larger than the head of the bolt so as to face each of these bolts. Is formed. Therefore, a tool such as a socket inserted into the round hole can be fitted to the head of the bolt and tightened.

JP 2010-281400 A

  By the way, even in the case of an automatic transmission, a flywheel may be attached separately from the drive plate in order to further reduce vibration and noise. In this case, the flywheel is disposed adjacent to the drive plate in the same manner as the conventional starter plate, a ring gear is formed on the outer periphery thereof, and a round hole for fastening the bolt of the drive plate is formed. It is possible.

  However, when the socket is inserted into the round hole formed in the starting plate or the flywheel in this way, the socket S is inserted into the round hole H so that the socket S is substantially perpendicular to the flywheel 6 as shown in FIG. For this purpose, it is necessary to secure a work space V equal to or longer than the length of the socket S in the direction perpendicular to the flywheel F so as to be away from the round hole H.

  This work space V creates a dead space between the automatic transmission 3 and the oil pan 12 in the lower part of the internal combustion engine 1, which is against the demand for a compact powertrain and secures the capacity of the oil pan 12. Since it becomes difficult to do so, there is a risk that the amount of lubricating oil stored will be insufficient and the risk of occurrence of defects such as seizure may be increased.

  This invention is made | formed in view of this point, The objective is to narrow a space required in order to insert a tool in the through-hole provided in a flywheel, and to make a dead space small.

  In order to achieve the above object, the inventor of the present invention devised the shape of the through hole provided in the flywheel so that the tool can be inserted even in a narrow space.

  That is, the invention of claim 1 relates to a structure of an output portion in which an end portion of an output shaft of an internal combustion engine is connected to a torque converter of a transmission by a drive plate, and a portion near the outer periphery of the drive plate has a circumferential direction. A plurality of fastening members with a torque converter are disposed at intervals, and a flywheel is attached to the end of the output shaft on the side opposite to the transmission with respect to the drive plate. .

  In the flywheel, through holes for fastening work are formed corresponding to each of the plurality of fastening members, and the shape thereof is a long hole shape long in the radial direction of the flywheel. In addition, that the through hole is formed corresponding to the fastening member means that the through hole is formed so as to include the fastening member when viewed in the axial direction of the output shaft of the internal combustion engine. . Moreover, the long hole shape long in the radial direction of the flywheel means that the length of the through hole in the radial direction of the flywheel is longer than the length in the circumferential direction.

  In the above configuration, since the through hole for fastening work is a long hole shape long in the radial direction of the flywheel, a tool for fastening work such as a socket is tilted in the radial direction with respect to the flywheel in this through hole. Can be inserted. By inserting the tip side of the tool into the through hole and then pulling the base end side perpendicular to the flywheel, the tip of the tool can be fitted to the fastening member. Become.

  Therefore, in order to insert the tool for fastening work, it is not necessary to secure a space more than the length of the tool in the direction perpendicular to the flywheel so as to leave the through hole, and this space is made narrower than before. be able to. Therefore, the dead space generated in the lower part of the internal combustion engine can be reduced, which is advantageous for making the powertrain compact.

  As described above, the shape (cross-sectional shape) of the through hole formed in the flywheel may be a rectangular shape, a trapezoidal shape, or a different shape such as a parallelogram or a pentagon, but preferably the radial direction of the flywheel. Long oval or elliptical shape. In this way, the inner peripheral side and the outer peripheral side of the flywheel of the through hole are arcuate, which facilitates the insertion of the tool and also obstructs the tightening of the fastening member by rotating the inserted tool. It ’s hard to be. In addition, it is sufficient to make one peripheral part of the flywheel inner peripheral side or outer peripheral side of the through hole into an arc shape.

  Similarly to the starting plate in the conventional example described above, when the flywheel is located between the drive plate and the oil pan in the direction of the axis of the output shaft of the internal combustion engine, the dead space is generated as described above. It becomes easy to ensure the capacity | capacitance of an oil pan by becoming small. Therefore, it is possible to reduce the risk of occurrence of defects such as seizure due to lack of lubricating oil.

  Further, the through hole may be provided so as to include a fastening member when viewed in the axial direction of the output shaft of the internal combustion engine. In particular, the peripheral edge on the inner peripheral side in the radial direction of the flywheel is formed from the fastening member. Is also preferably positioned on the inner peripheral side. Thus, by forming the through hole closer to the inner periphery of the flywheel, the influence on the moment of inertia can be reduced while reducing the weight.

  Furthermore, you may form the inclined surface which inclines so that a through-hole may expand, so that it is near a drive plate in the peripheral part of the flywheel inner peripheral side of a through-hole. If it carries out like this, when inserting a tool in a through-hole, the front-end | tip part comes to guide naturally toward a fastening member along an inclined surface, and workability | operativity improves.

  Alternatively, an inclined surface may be formed on the peripheral edge of the through hole on the outer peripheral side of the flywheel so that the through hole expands as the distance from the drive plate increases. If it carries out like this, it will become easy to insert the front-end | tip part of a tool in a through-hole.

  As described above, in the structure of the output part of the internal combustion engine according to the present invention, when the flywheel is provided with a through hole and an adjacent drive plate is fastened to the torque converter, a tool can be inserted into the through hole. did. And the through-hole was made into a long hole shape long in the radial direction of the flywheel so that the tool could be inserted while being tilted with respect to the flywheel. As a result, the space required for the fastening operation can be narrowed, and the dead space of the internal combustion engine can be reduced, contributing to its compactness and easily securing the capacity of the oil pan. Can be reduced.

It is sectional drawing which shows the structure of the output part of the engine which concerns on embodiment of this invention. FIG. 2 is a skeleton diagram showing a schematic configuration of an automatic transmission coupled to the engine. FIG. 2 is a plan view (a) and a perspective view (b) showing a single flywheel attached to a crankshaft of the engine. It is a perspective view which shows the space for the fastening work etc. by reversing the top and bottom of the crankcase of the engine. It is explanatory drawing which expands the output part of an engine and shows a fastening operation | work. FIG. 6 is a view corresponding to FIG. 5 showing a procedure for inserting a socket in a fastening operation. FIG. 7 is a view corresponding to FIG. 6 showing a conventional general insertion procedure. FIG. 3 is a view corresponding to FIG. 3 (a) according to another embodiment in which an inclined surface is provided at the peripheral edge of the through hole. FIG. 7 is a view corresponding to FIG. 6 according to another embodiment.

  Hereinafter, an embodiment in which the present invention is applied to a gasoline engine (internal combustion engine) mounted on an automobile will be described as an example with reference to the drawings.

  FIG. 1 shows a structure of a portion for connecting a crankshaft 2 (output shaft) of an engine 1 according to an embodiment of the present invention to a torque converter 4 of an automatic transmission 3 (transmission device). In this figure, the outer shapes of the cylinder block 10, the crankcase 11 and the oil pan 12 of the engine 1 are represented by phantom lines, and the cylinder block 10 and the crank The automatic transmission 3 is assembled so as to straddle the case 11.

  The automatic transmission 3 is, for example, a belt-type CVT (Continuously Variable Transmission), and the rotational output from the crankshaft 2 of the engine 1 is a torque converter as shown in the skeleton diagram of FIG. 4 is transmitted to the input shaft 31, and is transmitted to a wheel (drive wheel) (not shown) via the forward / reverse switching mechanism 32, the continuously variable transmission mechanism 33, the differential 34, and the like.

  The forward / reverse switching device 32 is basically a known device, and mainly includes a planetary gear mechanism 32a, a forward clutch 32b, and a reverse brake 32c, and rotates the input shaft 31 in a reverse rotational direction as necessary. Invert and output. The continuously variable transmission mechanism 33 is also basically known, and is formed by winding a belt 33c around a primary pulley 33a and a secondary pulley 33b, and changing the winding diameter of the belt 33c around the pulleys 33a and 33b. To change the speed.

  The torque converter 4 for transmitting the rotational output to the input shaft 31 is also basically a known one, and as will be described later, a pump impeller 41 to which the rotational output from the crankshaft 2 is input, and the pump impeller 41 A turbine runner 42 that is disposed on the same axis and is opposed to each other and driven via hydraulic oil, and a stator 43 that is interposed between the pump impeller 41 and the turbine runner 42 are provided.

  As shown in FIG. 5 to be described later, the pump impeller 41 is an impeller in which a plurality of blades are attached to a bowl-shaped housing, and a front cover 40 is welded to the open side of the housing, and hydraulic oil is contained inside. A chamber R is formed. When the pump impeller 41 rotates, the hydraulic oil in the hydraulic oil chamber R flows toward the opposed turbine runner 42.

  The turbine runner 42 is configured as an impeller like the pump impeller 41 and is rotated by the hydraulic fluid flowing from the pump impeller 41 as described above to rotate the input shaft 31 of the automatic transmission 3. Further, the hydraulic oil that has driven the turbine runner 42 is rectified by the stator 43 when it returns to the pump impeller 41, and at this time, a torque amplification action occurs.

  Note that a lockup clutch 44 is provided between the turbine runner 42 and the front cover 40 to directly connect the turbine runner 42 and the rotation output from the crankshaft 2 without passing through the hydraulic oil. A damper 45 is provided for reducing the rotational fluctuation of the crankshaft 2 transmitted to the cover 40.

-Output transmission structure from crankshaft to torque converter-
The rotation output from the crankshaft 2 as described above is transmitted to the front cover 40 of the torque converter 4 by the drive plate 5. That is, as shown in FIG. 1, the inner peripheral portion of the drive plate 5 is fastened to the flange portion 2 a of the end portion of the crankshaft 2 together with a flywheel 6 described later, A portion near the outer periphery is fastened to the front cover 40 by a plurality of (for example, six) bolts 7 (fastening members: nuts) arranged at intervals in the circumferential direction.

  As an example, the drive plate 5 is formed by pressing a steel plate into a disk shape, and has a high rigidity in the circumferential direction in order to transmit a large rotational output from the crankshaft 2. On the other hand, the thickness of the drive plate 5 is set so as to be appropriately elastically deformed according to the bending of the front cover 40 that receives the high pressure in the hydraulic oil chamber R, and the drive plate 5 has a radial intermediate portion. An annular groove 5a is formed.

  In the automatic transmission 3 as in this embodiment, the torque converter 4 generally has a large moment of inertia and absorbs torque fluctuations of the engine 1 (that is, rotation fluctuations of the crankshaft 2). Therefore, the output of the crankshaft 2 is transmitted to the torque converter 4 by the light drive plate 5. However, in the case of CVT which is often locked up, further reduction of vibration and noise may be required.

  In response to such a requirement, in the present embodiment, a flywheel 6 is also attached to the flange portion 2 a of the crankshaft 2 in addition to the drive plate 5. As described above, the drive plate 5 is required to be appropriately elastically deformed in accordance with the bending of the front cover 40 of the torque converter 4. Therefore, in order to increase the moment of inertia as a measure against vibration and noise, This is because when the thickness is increased, the rigidity becomes too high and an unexpected failure may occur.

  As shown in FIG. 3, a cylindrical boss portion 61 projecting toward the drive plate 5 is formed at a portion closer to the inner periphery in the radial direction of the flywheel 6 so as to surround the center hole 60 having a circular cross section. Has been. A plurality of (eight in the illustrated example) bolt holes 62, 62,... Are opened on the end surface of the boss portion 61, and the drive plate 5 is overlaid on the end surface of the boss portion 61, as shown in FIG. As shown, the bolts 63, 63,... Are fastened to the flange portion 2 a of the crankshaft 2 together.

  On the other hand, an annular peripheral wall portion 64 that protrudes in the same direction as the boss portion 61 is formed on the outer peripheral portion of the flywheel 6, and a starter motor (not shown) is protruded in the opposite direction to the peripheral wall portion 64. A ring gear 65 (shown only in FIG. 3B) is formed to mesh with the pinion. And between the outer peripheral wall part 64 and the inner peripheral boss part 61, there are a plurality of through holes 66, 66,... Elongated in the radial direction of the flywheel 6 (six in the example in the figure), Is formed.

  These through holes 66, 66,... Correspond to the plurality of bolts 7, 7,... That fasten the drive plate 5 to the front cover 40 as described above, respectively in the circumferential direction of the flywheel 6. It is formed at intervals. Each through-hole 66 is opened in opposition to the vicinity of the head of the bolt 7 for inserting the socket S (fastening work tool) and tightening the bolt 7 as described below. It is.

  That is, as shown upside down in FIG. 4, the oil pan 12 is attached to one side (left front side in FIG. 4) in the longitudinal direction of the bottom wall part (upper part in FIG. 4) of the crankcase 11. While an opening 11a having an area is formed, a recess 11b is formed in a smaller area than the opening 11a on the other side in the longitudinal direction (the right back side in FIG. 4). A space V for fastening the bolt 7 is obtained.

  The working space V communicates with an opening 11c of an end wall portion (a wall portion on the right back in FIG. 4) of the crankcase 11 to which a case 30 (see FIG. 1) of the automatic transmission 3 is fastened. As shown in an enlarged view in FIG. 5, the socket S is turned sideways (extends in the direction of the crankshaft core C) and inserted into the through hole 66 of the flywheel 6, and its tip (right end in the figure). Can be fitted to the head of the bolt 7.

  Specifically, after the automatic transmission 3 is attached to the cylinder block 10 and the crankcase 11 as shown in FIG. 1, the torque converter 4, the drive plate 5, and the flywheel 6 are rotated together as shown in FIG. The through holes 66, 66,... Are made to face the opening 11c of the crankcase 11 sequentially. Then, the operation of rotating and tightening the socket S fitted to the head of the bolt 7 as shown in FIG. 5 is repeated six times, and the drive plate 5 is fastened to the front cover 40.

  Thus, when the bolt 7 is tightened, the socket S is rotated in a state where the socket S is inserted through a portion of the through hole 66 on the outer peripheral side of the flywheel. In this embodiment, the through hole 66 has an oval shape. In addition, since the outer peripheral edge of the flywheel has an arc shape, it does not obstruct the rotation of the socket S.

  Here, when the socket S is inserted into the work space V as described above, in this embodiment, as shown in FIG. In other words, the flywheel 6 is inserted into the recess 11b of the crankcase 11 from its tip (upper end) as a state of being largely tilted downward from the vertical direction.

  Then, as indicated by a broken line in the figure, the tip end (upper end) of the socket S is inserted into the through hole 66 of the flywheel 6 while gradually laying down the tip end side of the socket S. And the base end side of the socket S is pulled up so that it may become perpendicular | vertical with respect to the flywheel 6, and is turned sideways as shown by the continuous line in the same figure, and the front-end | tip part (right end part in the figure) of the socket S Is fitted to the head of the bolt 7.

  The reason why the socket S can be inserted into the through-hole 66 in this manner is that the through-hole 66 has an oval shape that is long in the radial direction of the flywheel 6 as described above. If the through hole is a round hole having a slightly larger diameter than the socket S, the socket S must be inserted perpendicularly to the flywheel 6 as shown by a solid line in FIG. Therefore, a work space V equal to or longer than the length of the socket S must be secured perpendicularly to the flywheel 6 (on the left side of the figure) away from the round hole H.

  Since this work space V creates a dead space between the oil pan 12 and the automatic transmission 3, the length of the oil pan 12 must be shortened accordingly, and the capacity is ensured. It will be difficult. On the other hand, in this embodiment, since the socket S can be inserted obliquely from the lower side as described above, the work space V can be considerably reduced as shown in FIG. 6, and the dead space is also reduced.

  That is, in the engine 1 according to the present embodiment, the through hole 66 for fastening the drive plate 5 is formed into a long hole shape that is long in the radial direction of the flywheel 6, so that the space V necessary for the work is reduced. Thus, the dead space under the engine 1 can be reduced. Therefore, it contributes to the downsizing of the power train including the engine 1 and the automatic transmission 3, and the capacity of the oil pan 12 can be sufficiently secured to reduce the risk of seizing.

  Further, the elongated hole-like through hole 66 has a flywheel outer peripheral side at a position corresponding to the bolt 7, and an inner peripheral edge portion is positioned closer to the inner peripheral side than the bolt 7 in the radial direction of the flywheel 6. In other words, the through-hole 66 is formed as close to the inner periphery of the flywheel 6 as possible within a range in which the socket S for fastening the bolt 7 can be inserted, and this allows inertia while reducing the weight of the flywheel 6. The influence on the moment can be reduced.

-Other embodiments-
The configuration of the present invention is not limited to the above-described embodiment, and includes other various forms. That is, for example, in the above-described embodiment, the through hole 66 of the flywheel 6 has an oval shape. It is good.

  Since it is easy to rotate the inserted socket 7, it is preferable that at least one peripheral portion of the through hole 66 on the inner peripheral side and the outer peripheral side of the flywheel has an arc shape, but is not limited thereto. In the above embodiment, the flywheel outer peripheral edge of the through hole 66 is positioned so as to correspond to the bolt 7, but the flywheel inner peripheral edge of the through hole 66 is positioned so as to correspond to the bolt 7. Also good.

  Furthermore, you may form an inclined surface in the peripheral part of the through-hole 66 of the flywheel inner peripheral side and the outer peripheral side. As an example, FIG. 8 shows an example in which an inclined surface 66 a is provided on the inner peripheral edge of the flywheel of the through hole 66 so that the hole diameter increases as it approaches the drive plate 5. The inclined surface 66a is inclined so as to gradually move toward the inner peripheral side of the flywheel from the surface of the flywheel 6 closer to the engine (left surface in the figure) toward the surface closer to the transmission (right surface in the figure).

  When such an inclined surface 66a is provided, when the distal end portion of the socket S is inserted into the through hole 66 as shown in FIG. 9, the distal end portion of the socket S inserted obliquely upward becomes the inclined surface 66a of the through hole 66. Even if they come into contact with each other, they are guided along the inclined surface 66a so as to naturally go into the through hole 66 (to the right side in the figure). That is, the leading end portion of the socket S is guided toward the bolt 7 and workability is improved.

  Although not shown, an inclined surface may be formed on the periphery of the through hole 66 on the outer peripheral side of the flywheel so that the hole diameter increases as the distance from the drive plate 5 increases. In this way, the lower edge portion of the through hole 66 at the lowest position becomes an inclined surface that gradually decreases in height from the surface close to the transmission of the flywheel 6 toward the surface close to the engine. It is easy to insert the socket S.

  In the above-described embodiment, the belt-type CVT is used as the automatic transmission 3. However, the present invention is not limited to this, and the automatic transmission may be a toroidal CVT or a planetary gear. It may be a mechanical multi-stage transmission.

  Furthermore, in the above embodiment, the case where the present invention is applied to an in-line four-cylinder gasoline engine mounted on an automobile is not limited to this. Of course, the engine is not limited to an in-line three-cylinder engine. An in-line engine with five or more cylinders may be used, or a V-type engine or a horizontally opposed engine may be used. The engine is not limited to a gasoline engine, and may be a diesel engine, a gas engine, or a rotary engine.

  The present invention is used for a connection operation with a transmission, reduces the space around the internal combustion engine that becomes a dead space after the operation, and contributes to the compactness of the power train. Highly effective when applied to internal combustion engines.

1 engine (internal combustion engine)
2 Crankshaft (output shaft)
2a Flange (output shaft end)
3 Automatic transmission (transmission)
DESCRIPTION OF SYMBOLS 4 Torque converter 40 Front cover 5 Drive plate 6 Flywheel 66 Through hole for fastening work 66a Inclined surface of through-hole periphery 7 Bolt (fastening member)
C Crankshaft core (shaft core of output shaft)

Claims (5)

The structure of the output unit in which the end of the output shaft of the internal combustion engine is connected to the torque converter of the transmission by a drive plate,
A plurality of fastening members with a torque converter are arranged in a portion near the outer periphery of the drive plate at intervals in the circumferential direction,
A flywheel is attached to the end of the output shaft on the side opposite to the transmission with respect to the drive plate,
The flywheel has a through hole for fastening operation corresponding to each of the plurality of fastening members, and the through hole has a long hole shape that is long in the radial direction of the flywheel. The structure of the output part of the internal combustion engine. The structure of the output part of the internal combustion engine according to claim 1,
The structure of the output part of an internal combustion engine in which the said through-hole is made into the ellipse shape or the ellipse shape. The structure of the output part of the internal combustion engine according to claim 2,
The flywheel is a structure of an output portion of an internal combustion engine, which is disposed between the drive plate and an oil pan in the direction of the axis of the output shaft. In the structure of the output part of the internal combustion engine according to any one of claims 1 to 3,
The structure of the output part of an internal combustion engine in which the peripheral part of the flywheel inner peripheral side of the through hole is located closer to the inner peripheral side of the flywheel than the fastening member in the radial direction of the flywheel. In the structure of the output part of the internal combustion engine according to any one of claims 1 to 4,
The structure of the output part of an internal combustion engine in which the inclined surface which inclines so that a through-hole enlarges, so that it is near the said drive plate is formed in the peripheral part of the flywheel inner peripheral side of the said through-hole.

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