JP2009287627A - Power transmitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmitting device which provides quietness by suppressing noise vibration due to swaying in a radial outer side of a curved portion when applying a resin pulley, and effectively suppresses abrasion of a guide face due to a great deal of frictional force when applying a resin guide member. <P>SOLUTION: The power transmitting device is provided with: a shaft 531 rotatably supporting an idle pulley 53 wound with a portion between greater diameter cam sprockets of a first timing chain 41 in between the greater diameter cam sprockets of both right and left banks on the resin guide member 54 guiding the first timing chain 41 between the greater diameter cam sprockets of both right and left banks; and the guide faces 541, 541 guiding a non-contact portion of the first timing chain 41 with the idle pulley 53 from a radial inner side of the curved portion 411 in a running direction upstream side and a running direction downstream side than the curved portion 411 of the first timing chain 41 curved by being wound on the idle pulley 53. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power transmission device that transmits the power of a drive rotator through an endless belt-like member such as a chain or a belt wound around a plurality of driven rotators.

  In general, in such a power transmission device, an endless belt-like member is used to drive the power of the drive rotor by winding an endless belt-like member such as a chain or a belt between the drive rotor and a plurality of driven rotors. Is transmitted to each driven rotor.

  And when the space | interval between each rotary body becomes long among a drive rotary body and several driven rotary bodies, a resin-made guide member is provided between the rotary bodies, This resin-made guide member Is used to guide the portion between the rotating bodies of the endless belt-like member (see, for example, Patent Document 1).

Conventionally, there is also a demand for reducing the weight of the power transmission device, and from this point, applying a resin pulley to at least one of a plurality of driven rotating bodies has been performed (for example, Patent Documents). 2).
JP 2001-31457 A JP-A-10-122339

  By the way, depending on the layout of the drive rotator and each driven rotator, it may be necessary to bend the endless belt-like member such as a chain or belt with a resin pulley or a resin guide member.

  In that case, when the resin pulley is applied to the curved portion of the endless belt member, the non-contact portion of the endless belt member released from the contact portion (curved portion) with the resin pulley, that is, the resin of the endless belt member There is a possibility that the curved portion may be deflected radially inward and outward in a non-contact portion with the made pulley. This is because the endless belt-like member is locally bent by being wound around the resin pulley (driven rotating body), so that the open portion of the endless belt-like member released from contact with the resin pulley, that is, endless This is presumably because the curved portion is deflected radially inward and outward at the non-contact portion of the belt-shaped member with the resin pulley. Therefore, noise and vibration may occur due to this vibration.

  On the other hand, when the resin guide member is applied to the curved portion of the endless strip member, the resin guide member guides the endless strip member from the radially inner side of the curved portion. A large frictional force from the curved portion of the endless belt member acts on the guide surface (contact surface), and the guide surface of the resin guide member is easily worn.

  As described above, the resin pulley and the resin guide member each have unique problems, and it is impossible to apply the resin pulley and the resin guide member to the curved portion of the endless belt-like member.

  The present invention has been made in view of such a point, and the object of the present invention is to generate noise and vibration caused by deflection of the curved portion inward and outward in the radial direction when a resin pulley is applied. An object of the present invention is to provide a power transmission device that can be suppressed to achieve quietness and that can effectively suppress wear of a guide surface due to a great frictional force when a resin guide member is applied.

  In order to achieve the above object, the present invention presupposes a power transmission device that transmits the power of a drive rotator by an endless belt-like member wound between a plurality of driven rotators, And a resin guide member for guiding the endless belt member. A support portion that rotatably supports the resin pulley, and a curved portion of the endless belt member that is curved by being wound around the resin pulley. A guide surface for guiding a non-contact portion of the endless belt-like member with the resin pulley on at least one of the side and the downstream side in the traveling direction from the radially inner side of the curved portion.

  By this specific matter, since the endless belt-like member is wound around the resin pulley that is rotatably supported by the support portion of the resin guide member, the endless belt-like member that is wound around the resin pulley and is curved The great frictional force acting from the curved part of the resin is effectively released by the rotation of the resin pulley, to the guide surface of the resin guide member that guides the non-contact part of the endless belt-like member with the resin pulley. This frictional force is also greatly reduced, and it is possible to effectively suppress wear of the guide surface of the resin guide member. In addition, the non-contact portion of the endless belt-shaped member with the resin pulley is curved by the guide surface of at least one resin guide member on the upstream side in the traveling direction and the downstream side in the traveling direction with respect to the curved portion of the endless belt-shaped member. Since it is guided over a wide range from the radially inner side of the part, when the resin pulley is applied to the curved part of the endless belt-like member, the curve that occurs in the non-contact part of the endless belt-like member with the resin pulley The vibration of the portion inward and outward in the radial direction can be smoothly suppressed, and it is possible to achieve quietness by suppressing the generation of noise and vibration caused by the vibration.

  In particular, when a timing chain is applied as the endless belt member, the action of a greater frictional force from the curved portion of the timing chain is effectively released by the rotation of the resin pulley, and the timing chain is made of resin. The frictional force acting on the guide surface of the resin guide member that guides the non-contact portion with the pulley is also greatly reduced, and it is possible to effectively suppress wear of the guide surface of the resin guide member. Become.

  Further, when an idler pulley is applied as the resin pulley, a large frictional force from the curved portion of an endless belt-like member such as a timing chain is effectively released by rotation of the idler pulley, and the endless belt-like The frictional force acting on the guide surface of the resin guide member that guides the non-contact portion of the member with the idler pulley is also reduced, and the wear of the guide surface of the resin guide member can be effectively suppressed. It becomes. In addition, it is possible to achieve noise reduction by suppressing the occurrence of noise and vibration due to the effect of suppressing the deflection of the endless belt-like member toward the radially inner and outer sides of the curved portion by the guide surface of the resin guide member.

  In short, by winding the endless belt-shaped member around the resin pulley of the resin guide member and bending it, the great frictional force acting from the curved portion of the endless belt-shaped member is effectively released by the rotation of the resin pulley. The frictional force acting on the guide surface of the resin guide member that guides the non-contact portion of the endless belt-like member with the resin pulley is greatly reduced, and the wear of the guide surface of the resin guide member is effectively suppressed. be able to. In addition, the resin guide from the radially inner side of the curved portion to the non-contact portion with the resin pulley of the endless strip member on at least one of the upstream side in the traveling direction and the downstream side in the traveling direction with respect to the curved portion of the endless strip member. By guiding the member also with the guide surface, the non-contact portion of the endless belt-shaped member with the resin pulley is guided over a wide range from the radially inner side of the curved portion to the radially inner and outer sides of the curved portion. It is possible to suppress the vibration and to suppress the occurrence of noise and vibration due to the vibration, thereby achieving quietness.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a front view partially showing a V-type engine to which a power transmission device according to an embodiment of the present invention is applied. As shown in FIG. 1, an internal combustion engine 1 (hereinafter referred to as an engine) includes a lower block in which an oil pan or the like for storing lubricating oil (not shown) is assembled, a cylinder block 11, a cylinder head 12, and a cinder (not shown). It is configured to be stacked in order with the head cover. The engine 1 is a V type 6 cylinder engine. A crank sprocket 21 as a drive rotator is attached to the tip of the crankshaft 2 (front end in FIG. 1) so as to be able to rotate integrally. The cylinder head 12 is branched into a V-shape centering on the cylinder bore, and the left side portion in FIG. 1 constitutes the right bank RH, and the right side portion in FIG. 1 constitutes the left bank LH.

  Further, as shown in FIG. 2, six cylinders 10, 10,... Are provided side by side in both banks RH and LH. In both banks RH and LH, above each cylinder 10, an intake side camshaft 31 and an exhaust side camshaft 32 extend in the front-rear direction and are arranged in parallel at a predetermined inter-axis distance. Between the banks RH and LH, an intake pipe (not shown) is connected to the intake manifold of the cylinder head 12 from the upper direction of FIG. 1, and the exhaust of the cylinder head 12 is disposed outside the banks RH and LH. An exhaust pipe connected to the manifold is arranged. The intake side camshaft 31 is formed with two cams 311 for opening and closing the intake valves 13 and 13 for each cylinder 10, and the exhaust side camshaft 32 is provided with the exhaust valves 14 and 10 for each cylinder 10. Two cams 321 and 321 for opening and closing 14 are formed per cylinder. Each bank RH, LH has a plurality of bearings (not shown) spaced apart along the axial direction of each camshaft 31, 32, and each camshaft 31, 32 is rotatably supported by the bearing. Yes.

  In order to transmit the rotation of the crankshaft 3 to each intake-side camshaft 31, a large-diameter cam sprocket 312 as a driven rotating body is attached to the tip (front end) of each intake-side camshaft 31 so as to be able to rotate integrally. Yes.

  A first timing chain 41 as an endless belt-like member is wound around the crank sprocket 21 and both large-diameter cam sprockets 312 and 312, and the rotation of the crankshaft 2 is inhaled via the first timing chain 41. It is transmitted to the side camshaft 31. Between the large-diameter cam sprocket 312 and the crank sprocket 21 of the right bank RH, there is a chain tensioner 51 that automatically adjusts a predetermined tension of the first timing chain 41 from the outside to remove slack. Has been. Further, a synthetic resin chain guide 52 for guiding the first timing chain 41 to a predetermined position is disposed between the large-diameter cam sprocket 312 and the crank sprocket 21 of the left bank LH.

  A small-diameter cam sprocket 313 is attached to the leading end side of each intake-side camshaft 31 (the rear side of the large-diameter cam sprocket 312) so as to be integrally rotatable. A small-diameter cam sprocket 322 is attached to the tip of each exhaust-side camshaft 32 so as to be integrally rotatable. The second timing chain 42 is wound around the small diameter cam sprockets 313 and 322 on the same bank LH, RH side, and the rotation of the crankshaft 2 transmitted to the large diameter cam sprocket 312 is the second. It is also transmitted to each exhaust side camshaft 32 via the timing chain 42.

  Between the large-diameter cam sprockets 312 and 312 of the left and right banks LH and RH, the large first timing chain 41 wound around the large-diameter cam sprockets 312 and 312 of the left and right banks LH and RH, respectively. A resin pulley is applied to an idler pulley 53 as a driven rotating body that winds a portion between the radial cam sprockets 312 and 312. A resin guide member 54 is provided between the large-diameter cam sprockets 312 and 312 of the left and right banks LH and RH to guide the portion of the first timing chain 41 between the large-diameter cam sprockets 312 and 312. Yes. The resin guide member 54 has an inverted trapezoidal shape when viewed from the front, and has an accommodation space 542 in the center thereof. As shown in FIGS. 3 and 4, an idler pulley 53 is rotatably supported in the accommodation space 542 via a shaft 531 as a support portion. The lower part of the idler pulley 53 accommodated in the accommodating space 542 of the resin guide member 54 is exposed below the lower end of the resin guide member 54, and the first timing chain is exposed to the exposed part of the idler pulley 53. 41 (curved part 411) is wound. The crank sprocket 21, the large-diameter cam sprockets 312 and 312 of the left and right banks LH and RH, the idler pulley 53, the first timing chain 41 and the second timing chain 42 are used to drive the power of the crank sprocket 21 to the left and right banks LH. , RH large-diameter cam sprockets 312, 312 and idler pulley 53 are transmitted by first timing chain 41, and the power of crankshaft 2 transmitted to each large-diameter cam sprocket 312 is A power transmission device 5 is configured to be transmitted by a second timing chain 42 wound between the exhaust camshaft 32 and the exhaust side camshaft 32. In this case, the idler pulley 53 is accommodated from above in the accommodating space 542 of the resin guide member 54.

  Further, on the left and right sides of the resin guide member 54, the traveling direction upstream side (the right side in FIG. 4) and the traveling direction with respect to the curved portion 411 of the first timing chain 41 that is curved by being wound around the idler pulley 53. Guide surfaces 541 and 541 are provided for guiding a non-contact portion of the first timing chain 41 with the idler pulley 53 on the downstream side (left side in FIG. 4) from the radially inner side of the curved portion 411. Each guide surface 541 is formed along the inclined surface of the first timing chain 41 that is inclined by winding around the idler pulley 53 between the large-diameter cam sprockets 312 and 312 of the left and right banks LH and RH. In this case, a recess (not shown) that avoids interference with the teeth of the idler pulley 53 (not shown) is provided on the opposing surface (side surface of the first timing chain 41 in the accommodation space 542) of the resin guide member 54 that faces the idler pulley 53. Is provided.

  Therefore, in the above embodiment, the portion between the large-diameter cam sprockets 312 and 312 of the first timing chain 41 wound around the large-diameter cam sprockets 312 and 312 of the left and right banks LH and RH is the resin guide member 54. Is wound around an idler pulley 53 that is rotatably supported by the shaft 531, so that a large amount of friction acts from the curved portion 411 of the first timing chain 41 that is wound around the idler pulley 53 and curved. The force is effectively released by the rotation of the idler pulley 53, and the friction on the guide surfaces 541 and 541 of the resin guide member 54 that guides the non-contact portion of the first timing chain 41 with the idler pulley 53. The action of the force is also greatly reduced, and the wear of each guide surface 541 of the resin guide member 54 is effectively suppressed. Door can be.

  In addition, the non-contact portion of the first timing chain 41 with the idler pulley 53 is located on the upstream side in the traveling direction and the downstream side in the traveling direction with respect to the curved portion 411 of the first timing chain 41 by the guide surface of the resin guide member. Since it is guided over a wide range from the radially inner side of the curved portion 411, the idler pulley of the first timing chain 41 is applied when the idler pulley 53 is applied to the curved portion 411 of the first timing chain 41. As a result, the bending inward and outward in the radial direction of the curved portion 411 occurring in the non-contacting portion with 53 can be smoothly suppressed, and the generation of noise and vibration caused by this shaking can be suppressed to achieve quietness. .

  In addition, this invention is not limited to the said embodiment, The other various modifications are included. For example, in the above-described embodiment, the case where the resin pulley is applied to the idler pulley 53 has been described. However, the portion between the sprockets of the first timing chain between at least one large-diameter cam sprocket and the crank sprocket of both the left and right banks. Is wound around a resin pulley rotatably supported by a resin guide member, and a non-contact portion with the resin pulley in a portion between the sprockets of the first timing chain is a guide surface of the resin guide member The application portion of the resin guide member and the resin pulley is not particularly limited.

  Moreover, in the said embodiment, although the idler pulley 53 as a single resin pulley was accommodated in the accommodation space 542 of the resin guide member 54, a resin guide member long along the traveling direction of the first timing chain is used. A plurality of resin pulleys are accommodated at predetermined intervals in the longitudinal direction of the resin guide member, and the first timing chain on the upstream side in the running direction and the downstream side in the running direction with respect to the curved portion of the first timing chain is provided. The non-contact portion with the resin pulley may be guided by the guide surface from the radially inner side of the curved portion.

  In the above embodiment, the case where the endless belt-like member is applied to the first timing chain 41 has been described. However, the present invention is not limited to the chain, and may be applied to a belt such as a timing belt. It is.

  In the above embodiment, the resin guide member is not in contact with the idler pulley 53 of the first timing chain 41 on the upstream side in the running direction and the downstream side in the running direction with respect to the curved part 411 of the first timing chain 41. In contrast, guide surfaces 541 and 541 are provided for guiding from the radially inner side of the curved portion 411. However, the guide surfaces 541 and 541 are provided on either the upstream side in the traveling direction or the downstream side in the traveling direction with respect to the curved portion of the first timing chain. The resin guide member may be provided with only a single guide surface that guides the non-contact portion of the timing chain with the idler pulley from the radially inner side of the curved portion.

  Furthermore, although the case where it applied to the V type 6 cylinder engine was described in the said embodiment, it is not limited to a V type engine, Of course, it can apply also to an inline type engine.

1 is a front view partially showing a V-type engine using a power transmission device according to an embodiment of the present invention. It is the typical top view which looked at the engine from the cylinder head cover side. It is the top view which looked at the resin-made guide members and idler pulleys from the upper part. It is the enlarged view which looked at resin-made guide members and idler pulley vicinity from the front side of the V type engine.

Explanation of symbols

1 Engine 21 Crank sprocket (drive rotor)
312 Large-diameter cam sprocket (driven rotor)
41 First timing chain (endless belt-like member)
411 Curved portion 53 Idler pulley (resin pulley, driven rotor)
531 shaft (support)
54 resin guide member 541 guide surface

Claims (3)

In the power transmission device that transmits the power of the driving rotator by an endless belt member wound between a plurality of driven rotators,
While having a resin pulley applied to at least one of the driven rotating bodies,
A resin guide member for guiding the endless belt member;
The resin guide member is
A support portion for rotatably supporting the resin pulley;
The endless belt-like member of the endless belt-like member on at least one of the upstream side in the running direction and the downstream side in the running direction with respect to the curved portion of the endless belt-like member curved by being wound around the resin pulley A power transmission device comprising a guide surface for guiding a non-contact portion from the radially inner side of the curved portion. The power transmission device according to claim 1,
A timing transmission chain is applied as the endless belt-shaped member. In the power transmission device according to claim 1 or 2,
An idler pulley is applied as the resin pulley.

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