JP4572629B2 - Transmission body vibration suppression device for V-type internal combustion engine - Google Patents

Description

  The present invention is endlessly straddling the first and second driven rotating bodies attached to the first and second camshafts disposed in each bank of the V-type internal combustion engine and the driving rotating body attached to the crankshaft. In the camshaft drive mechanism in which a portion between each driven rotor is bent into a V shape by drawing a portion between each driven rotor to the drive rotor side in the transmitter. The present invention relates to a transmission body vibration suppressing device that suppresses vibration of a V-shaped zone.

  For example, in a DOHC type V-type internal combustion engine, two camshafts for intake and exhaust are respectively disposed on two cylinder heads attached to the upper part of the first bank and the second bank of a V-shaped cylinder block, It has a configuration with a total of four camshafts.

  Such a camshaft drive mechanism of a DOHC type V-type internal combustion engine is attached to a drive rotor (for example, a crank sprocket) attached to one end of a crankshaft and one end of an intake camshaft of the first bank. An endless transmission body (for example, a cam sprocket) and a second driven rotation body (for example, a cam sprocket) attached to one end of the intake camshaft of the second bank. A timing chain is wound around (see, for example, Patent Document 1).

  In each bank, the intake camshaft and the exhaust camshaft are interlocked via an endless transmission body such as a chain or a belt, or a gear.

  Thereby, the transmission body is wound in a substantially inverted triangular pattern when viewed from the front, and a V-shaped zone is formed between the two driven rotating bodies and the driving rotating body. This V-shaped zone is referred to as the lower V-shaped zone.

  A movable guide is provided in the linear portion on the upstream side in the rotational direction of the transmission body (between the driving rotary body and the first driven rotary body), and a linear portion on the downstream side in the rotational direction of the transmission body (second driven rotary body and drive). Each fixed guide is pressed against the rotating body. The movable guide oscillates with the end on the drive rotator side as a fulcrum by fixing the end on the drive rotator to the cylinder block so that the end is free. It is supported in a moist state. A hydraulic actuator is disposed at the end (free end) of the movable guide on the first driven rotor side. The movable guide and the hydraulic actuator constitute a tensioner that appropriately adjusts the tension of the transmission body. Further, a guide that slightly presses the inner peripheral side of a linear portion between the driven rotating bodies in the transmission body is disposed.

  In the case of an OHC type V-type internal combustion engine, a configuration in which one camshaft for intake and exhaust is arranged in each of the first bank and the second bank of the V-shaped cylinder block, and a total of two camshafts are used. However, the winding pattern of the transmission body is basically the same as described above.

  In such a configuration, it is considered that it is necessary to provide a block wall between the banks of the cylinder block and attach it to this block wall with respect to the guide disposed in the linear portion between each driven rotor in the transmission body. It is not preferable because the block structure becomes complicated and heavy. Moreover, since the wrapping angle of the transmission body with respect to each driven rotating body is small, the load burden on the teeth of the transmitting body and each driven rotating body is increased, and the durability is not preferable.

On the other hand, in order to simplify the shape of the cylinder block and to increase the winding angle of the transmission body with respect to each driven rotating body, a portion between the two driven rotating bodies in the transmission body is set as an idler (sprocket). Alternatively, there is one in which a portion between each driven rotating body is bent into a V shape by pulling it to the driving rotating body side with a pulley (see, for example, Patent Document 2). This V-shaped zone is referred to as the upper V-shaped zone.
Japanese Patent No. 2715713 JP-A-9-100705

  In the first place, not only in the V-type internal combustion engine but also in the internal combustion engine as a whole, in order to increase the durability of the transmission body, there is a tendency to set it appropriately so as not to increase the tension of the transmission body. Therefore, during the operation of the V-type internal combustion engine, due to the pulsating rotation of the crankshaft, the pulsating rotation of each camshaft, etc., the linear portion on the upstream side in the rotational direction in the upper V-shaped zone of the transmission body (first driven rotating body) Irregular tension fluctuations that are independent of each other may occur in the linear portion (between the idler and the second driven rotor) on the downstream side in the rotational direction.

  As a result, vibration is generated in the upper V-shaped zone of the transmission body and the behavior becomes unstable. Therefore, in the upper V-shaped zone of the transmission body, the portion that wraps around the idler and the portion that wraps around the second driven rotor are engaged. Vibration and noise are likely to occur, such as loud sounds.

  On the other hand, for example, two sets of tensioners (consisting of a movable guide and a hydraulic actuator) installed in the lower V-shaped zone described above are installed in the upper V-shaped zone of the transmitting body. It is also conceivable to take measures so as to suppress the fluctuation in tension. However, when such two sets of tensioners are used, the hydraulic actuator is expensive and it is necessary to provide a hydraulic circuit to the hydraulic actuator. In order to install, it is necessary to provide a block wall between the banks of the cylinder block, and the structure of the cylinder block becomes complicated and heavy.

  Accordingly, an object of the present invention is to stabilize the behavior of a transmission body and suppress the generation of vibration and noise in a transmission body vibration suppression device for a V-type internal combustion engine with a relatively simple and inexpensive configuration.

The present invention is endlessly straddling the first and second driven rotating bodies attached to the first and second camshafts disposed in each bank of the V-type internal combustion engine and the driving rotating body attached to the crankshaft. Camshaft drive mechanism in which a portion between each driven rotating body is bent into a V shape by pulling a portion between each driven rotating body to the drive rotating body side with an idler. Is a transmission body vibration suppression device that is provided in the upper V-shaped zone and suppresses the vibration thereof, and is pressed against the linear portion on the upstream side in the rotational direction in the upper V-shaped zone of the transmission body, and the deflection of the linear portion a first movable guide is swingably supported in directions, pressed against the straight portion of the downstream side in the rotational direction of the upper V-shaped zone of the transmission member and the straight line A second movable guide that is swingably supported on minute vibration direction, is characterized in that a connecting member which connects the two movable guide to coordinate the swinging operation of the two movable guides.

  The drive rotator and the driven rotator are sprockets and pulleys, and the transmission body is a timing chain or a timing belt.

In this case, the upper V-shaped zone of the transmission body is stretched in a state where an appropriate tension is applied to the linear portion on the upstream side in the rotational direction and the linear portion on the downstream side in the rotation direction. If independent irregular tension fluctuations occur in the two linear portions, the two movable guides and the connecting member assembly do not cause the two linear portions to sway. The vibration is attenuated by oscillating so as to synchronize. As a result, the behavior of both linear portions can be stabilized, so that the vibration of the transmission body can be suppressed and the generation of the meshing sound in the portion wound around each driven rotor in the upper V-shaped zone of the transmission body can be suppressed. Is possible.

  Moreover, since the transmission body vibration suppression device is configured using two movable guides and a connecting member, the configuration is simple and inexpensive compared to the case of using two sets of tensioners as in the conventional example, Equipment costs can be reduced, for example, it can be easily installed without providing a block wall between both banks of the cylinder block.

  Preferably, the connecting member may be a rigid member, and a vibration damping mechanism that attenuates the vibration by applying an antiphase vibration to the swing of each movable guide to the connecting member may be provided. .

In this case, when the assembly of each movable guide and the connecting member is swung in accordance with the tension fluctuation of the upper V-shaped zone in the transmission body described above, the swing of the assembly can be attenuated. Thereby, the damping capability of the tension variation of the transmission body is improved.

  Preferably, the vibration damping mechanism includes a movable weight attached to the middle of the connecting member so as to be axially displaceable, and the connecting member is disposed on both sides in the axial direction of the movable weight, and the movable weight is disposed on both sides in the axial direction. And two elastic bodies that are pressed from each other.

In this case, when the assembly of the two movable guides and the connecting member is shaken in accordance with the tension variation of the upper V-shaped zone in the transmission body, the movable weight of the vibration control mechanism provided on the connecting member expands and contracts both elastic bodies. Although it slides upward, the inertial force of the movable weight gives an antiphase vibration to the swing of the assembly of each movable guide and connecting member. As a result, the swing of the assembly of both the movable guides and the connecting member and the swing of both linear portions in the upper V-shaped zone of the transmission body are attenuated, and the behavior of the upper V-shaped zone of the transmission body is stabilized.

  As described above, if the structure of the vibration control mechanism is specified, when the assembly of each movable guide and the connecting member swings, it is possible to easily apply vibration having a phase opposite to that of the swing of each assembly. Thereby, since it becomes possible to attenuate the shaking of each assembly, the attenuation capability of the tension fluctuation of the transmission body is improved. Moreover, since the vibration damping mechanism itself has a simple configuration using two elastic bodies and a single movable weight, two sets of transmission vibration suppression devices including this vibration damping mechanism are provided as in the conventional example. Compared to the case where the tensioner is used, the configuration is simple and inexpensive, and the equipment cost can be reduced.

  Preferably, both the elastic bodies may be set to different resonance frequencies.

  In this case, the two elastic bodies do not resonate with each other when they expand and contract, and it is possible to prevent the vibration of the transmission body from being amplified in the process of attenuating the vibration of the transmission body. In addition to adjusting the resonance frequency of each elastic body in this way, the resonance frequency of the movable weight can be easily adjusted by appropriately adjusting the resonance frequency of the movable weight in consideration of the resonance frequency of the movable guide and the like. become.

  Preferably, the connecting member may be an elastic body that presses both movable guides in a direction to separate them from each other.

In this case, since it is a configuration using two movable guides and a connecting member made of an elastic body, the configuration is simple and inexpensive compared to the case of using two sets of tensioners as in the conventional example, and the equipment cost is reduced. It becomes possible to keep it cheap. As an operation, since an appropriate tension is applied to the linear portion on the upstream side and the downstream side in the rotation direction in the upper V-shaped zone of the transmission body, the tension is less likely to fluctuate, and the deflection of both the linear portions Suppress. In addition, the elastic body is elastically deformed when the irregular irregular tension fluctuations occur at both the straight portions and shakes to attenuate the vibrations at both the straight portions. By these things, since the behavior of the upper V-shaped zone of the transmission body can be stabilized, the generation of vibration and noise can be reduced.

  According to the transmission body vibration suppression device for a V-type internal combustion engine according to the present invention, the behavior of the transmission body can be stabilized and the vibration of the camshaft drive mechanism and the generation of noise can be suppressed with a relatively simple and inexpensive configuration. it can. Therefore, it is possible to contribute to the improvement of quietness of the V-type internal combustion engine.

  Hereinafter, the best embodiment of the present invention will be described with reference to FIGS. In this embodiment, an example is shown in which the transmission body vibration damping device is applied to a DOHC type V-type internal combustion engine.

  In the figure, reference numeral 1 denotes a cylinder block of a V-type internal combustion engine. The cylinder block 1 is V-shaped, and although not shown, the cylinder heads 2A and 2B are fixed to the upper part of the banks 1A and 1B, respectively, and the oil pan 3 is attached to the lower part.

  The cylinder heads 2A and 2B are respectively provided with intake camshafts 4A and 5A and exhaust camshafts 4B and 5B, and a crankshaft 6 is provided below the cylinder block 1, and this crankshaft. 6, each camshaft 4A, 4B, 5A, 5B is driven to rotate. This camshaft drive mechanism will be described in detail below.

  The camshaft drive mechanism is provided at each shaft end of a drive rotating body (for example, sprocket or pulley) 10 attached to one shaft end of the crankshaft 6 and each intake camshaft 4A, 5A of each bank 1A, 1B. Attached driven rotating bodies (for example, sprockets or pulleys) 11, 12 and an endless transmission body (for example, a timing chain or a timing belt) wound around these driving rotating bodies 10 and the two driven rotating bodies 11, 12 13.

  The intake camshafts 4A and 5A and the exhaust camshafts 4B and 5B of the banks 1A and 1B are configured to be interlocked via helical gears 14A, 14B, 14C, and 14D, respectively. In addition, although not shown in figure as an alternative of helical gear 14A, 14B, 14C, 14D, it is also possible to use endless transmission bodies, such as a chain and a belt.

  Although not shown, such a camshaft drive mechanism is covered with a cover (timing chain cover or timing belt cover) attached to the front side of the cylinder block 1 and the cylinder heads 2A and 2B.

In order to increase each winding angle of the transmission body 13 with respect to each driven rotor 11, 12, a portion between the driven rotors 11, 12 in the transmission body 13 is moved to the drive rotor 10 side by an idler 15. By pulling in, the portion between the driven rotors 11 and 12 is bent into a V shape. The idler 15 is rotatably supported in a trough between the banks 1A and 1B of the cylinder block 1. Instead of the idler 15, a water pump sprocket or a water pump pulley can be used.

  Thus, in the transmission body 13, a relatively large V-shaped lower V-shaped zone is formed between the two driven rotating bodies 11, 12 and the driving rotating body 10, and the two driven rotating bodies are formed. A relatively small V-shaped upper V-shaped zone is formed between 11 and 12 and the idler 15.

  Here, for example, when the drive rotator 10 is rotated in the direction indicated by the arrow A in FIG. 1 (clockwise), the transmission body 13 is also rotationally driven in the direction indicated by the arrow B (clockwise). Therefore, if the rotation start position of the transmission body 13 is the drive rotary body 10, in the lower V-shaped zone of the transmission body 13, the linear portion 13a between the drive rotary body 10 and the first driven rotary body 11 is upstream in the rotational direction. The linear portion 13b between the second driven rotator 12 and the drive rotator 10 is on the downstream side in the rotational direction. On the other hand, in the upper V-shaped zone of the transmission body 13, the linear portion 13 c between the first driven rotor 11 and the idler 15 is on the upstream side in the rotational direction, and the linear portion between the idler 15 and the second driven rotor 12. 13d is the downstream side in the rotation direction.

  In the lower V-shaped zone of the transmission body 13, the movable guide 16 is pressed against the linear portion 13a on the upstream side in the rotational direction of the transmission body 13, and the fixed guide 17 is pressed against the linear portion 13b on the downstream side in the rotational direction of the transmission body 13, respectively. It has been. The movable guide 16 is rotatably fixed to the cylinder block 1 at the end on the drive rotator 10 side, and the end on the first driven rotator 11 side is in a free state, so that The end portion is supported in a swingable state. A hydraulic actuator 18 is disposed at the end (free end) of the movable guide 16 on the first driven rotor 11 side. The movable guide 16 and the hydraulic actuator 18 constitute a tensioner that appropriately adjusts the tension of the transmission body 13.

  And the transmission body vibration suppression apparatus 20 for stabilizing the behavior of the said upper V-shaped zone and suppressing a vibration is arrange | positioned at the upper V-shaped zone of the transmission body 13. As shown in FIG.

  The transmission body vibration suppressing device 20 includes two movable guides 21 and 22 and a single connecting member 23.

  The first movable guide 21 is pressed against the linear portion 13c (between the first driven rotor 11 and the idler 15) on the upstream side in the rotational direction in the upper V-shaped zone of the transmission body 13, and the second movable guide 22 is , The linear portion 13d (between the idler 15 and the second driven rotor 12) on the downstream side in the rotational direction in the upper V-shaped zone of the transmission body 13 is pressed.

  Each of the movable guides 21 and 22 is rectangular when viewed from above, and only one long side thereof is curved in a partial arc shape. The curved sides 21a and 22a are linear portions of the upper V-shaped zone of the transmission body 13. It is pressed against 13c, 13d. The length of the movable guides 21 and 22 in the longitudinal direction is preferably equal to the substantially entire length of the straight portions 13c and 13d, but is actually set to a slightly shorter dimension.

Furthermore, each movable guide 21, 22 has a bank 1 </ b> A, 1 </ b> A of the cylinder block 1 so that the other end in the longitudinal direction (the lower side in the figure) can swing with the one end side in the longitudinal direction (the upper side in the figure) as a fulcrum. Supported by 1B. That is, each movable guide 21, 22 is attached to each bank 1 </ b> A, 1 </ b> B of the cylinder block 1 via the support shafts 27, 27 at one end in the longitudinal direction. On the other end side in the longitudinal direction of each movable guide 21, 22, partial arc-shaped long holes 21 b, 22 b are provided along a virtual arc with the support portion of each movable guide 21, 22 as a fulcrum. The long holes 21 b and 22 b of the movable guides 21 and 22 are engaged with guide pins 28 attached to the cylinder block 1.

  The connecting member 23 connects both the movable guides 21 and 22, and is formed in a U shape by bending both ends of a relatively rigid member, for example, a round bar made of metal or synthetic resin, by about 90 degrees. Yes. Both ends 23a and 23b of the connecting member 23 are inserted into through holes 21c and 22c provided near the other end in the middle of the longitudinal direction of the movable guides 21 and 22, and project to the back side of the movable guides 21 and 22. The retaining grooves 29 and 29 such as a C-shaped ring are engaged and attached to the circumferential grooves 23c and 23d provided in the portion to be prevented from coming off. Note that both ends 23a and 23b of the connecting member 23 are slidably fitted into the through holes 21c and 22c of the movable guides 21 and 22, respectively. In order to smooth the sliding operation of the sliding portion and suppress wear, at least one of the both ends 23a and 23b of the connecting member 23 and the through holes 21c and 22c of the movable guides 21 and 22 as necessary. In addition, a lubricant having a low coefficient of friction and excellent wear resistance can be applied or coated.

  Furthermore, in this embodiment, since the connecting member 23 is provided with a single movable weight 24 and two elastic bodies 25 and 26 as a vibration damping mechanism that attenuates the vibration of both the movable guides 21 and 22, I will explain it.

  The movable weight 24 is attached to the middle in the axial direction of the straight portion of the connecting member 23 so as to be axially displaceable, and is formed in a cylindrical shape, for example.

  The elastic bodies 25 and 26 are arranged on both sides of the movable weight 24 in the linear portion of the connecting member 23, and press the movable weight 24 from both sides in the axial direction. The elastic bodies 25 and 26 are made of, for example, a coil spring or the like, and are in a compressed state between washers 30A and 30B such as washers attached to both ends of the straight portion of the connecting member 23 and both end faces of the movable weight 24. It is intervened. The washers 30A, 30B are positioned by retaining rings 31, 31 such as C-shaped rings that are engaged and mounted in circumferential grooves 23e, 23f provided at both ends of the straight portion of the connecting member 23.

  Next, with reference to FIG. 4 and FIG. 5, operation | movement of the said transmission body vibration suppression apparatus 20 is demonstrated.

  In the first place, not only in the V-type internal combustion engine but also in the whole internal combustion engine, in order to increase the durability of the transmission body 13, the tension of the transmission body 13 tends to be set appropriately so as not to be excessive. Therefore, during the operation of the V-type internal combustion engine, due to the pulsating rotation of the crankshaft 6 and the pulsating rotation of the camshafts 4A, 4B, 5A, 5B, etc., the upstream side in the rotational direction in the upper V-shaped zone of the transmission body 13 Irregular tension fluctuations independent of each other may occur between the straight portion 13c and the straight portion 13d downstream in the rotational direction.

  On the other hand, in the transmission body vibration suppression device 20 described above, the upper V-shaped zone of the transmission body 13 is stretched in a state in which an appropriate tension is applied to the upstream linear portion 13c and the downstream linear portion 13d. Therefore, if it is possible to suppress tension fluctuations and to generate independent irregular tension fluctuations in both linear portions 13c and 13d, as shown in FIG. 4 and FIG. Rather than forcibly pressing the straight portions 13c and 13d individually, the assembly of both the movable guides 21 and 22 and the connecting member 23 is swung so as to synchronize the swing of both the straight portions 13c and 13d. Attenuate vibration.

In addition, the movable weight 24 of the vibration control mechanism provided on the connecting member 23 expands and contracts both elastic bodies 25 and 26 along with the shaking of the assembly of both the movable guides 21 and 22 and the connecting member 23. However, the inertial force of the movable weight 24 gives vibrations in the opposite phase to the swing of the assembly of the movable guides 21 and 22 and the connecting member 23. As a result, the swing of the assembly of the movable guides 21 and 22 and the connecting member 23 and the swing of the linear portions 13c and 13d in the upper V-shaped zone of the transmission body 13 are attenuated, and the upper V-shaped zone of the transmission body 13 is attenuated. Will stabilize the behavior.

  Thus, since the behavior of both the straight portions 13c and 13d can be stabilized, the vibration of the transmission body 13 is suppressed, and the portion wound around the idler 15 in the upper V-shaped zone of the transmission body 13 and the second driven rotation. It becomes possible to suppress the generation of a meshing sound in the portion that wraps around the body 12. Therefore, the vibration and noise of the camshaft drive mechanism can be reduced, which can contribute to the improvement of the quietness of the V-type internal combustion engine.

  Further, the transmission body vibration suppression device 20 of the present embodiment has a configuration using two movable guides 21 and 22 and a single connecting member 23, and the vibration damping mechanism has two elastic bodies 25 and 26. And a single movable weight 24, the configuration is simple and inexpensive compared to the case of using two sets of tensioners as in the conventional example, and both banks 1A and 1B of the cylinder block 1 are used. Equipment costs can be kept low, for example, it can be easily installed without providing a block wall in between.

  Hereinafter, other embodiments of the present invention will be described.

  (1) Although not shown, the connecting member 23 of the transmission body vibration suppression device 20 is an elastic body, and the elastic body is attached to the first and second movable guides 21 and 22 in a state of pressing them in the direction of separating them. be able to. Specifically, the elastic body can be a coil spring, and the coil spring can be compressed and attached to the first and second movable guides 21 and 22. In this case, the above-described vibration suppression mechanism is not provided. Therefore, since the transmission body vibration suppression device 20 of this embodiment has the configuration using the two movable guides 21 and 22 and the connecting member made of a single elastic body, the number of parts is reduced as compared with the above embodiment. Therefore, the facility cost can be further reduced as compared with the conventional example.

  As an operation in this embodiment, since an appropriate tension is applied to the linear portion 13c on the upstream side in the rotation direction and the linear portion 13d on the downstream side in the upper V-shaped zone of the transmission body 13, Tension fluctuations in the V-shaped zone can be suppressed. In addition, the elastic body can be elastically deformed when the independent irregular tension fluctuations occur at both the straight portions 13c and 13d to cause vibration, and the shake of both the straight portions 13c and 13d can be attenuated. By these things, since the behavior of the upper V-shaped zone of the transmission body 13 can be stabilized, the generation of vibration and noise can be reduced.

  (2) In the above embodiment, the example in which the swing fulcrum of the first movable guide 21 and the swing fulcrum of the second movable guide 22 are both arranged on the first and second driven rotors 11 and 12 side is described. However, the present invention is not limited to this. For example, both the swing fulcrum of the first movable guide 21 and the swing fulcrum of the second movable guide 22 can be arranged on the idler 15 side. Further, for example, the swing fulcrum of one of the movable guides can be disposed on the opposite side of the swing fulcrum of the other movable guide. As an example, for example, as shown in FIG. 6, the swing fulcrum of the second movable guide 22 can be arranged on the idler 15 side. In this case, it is possible to enhance the effect of suppressing the shake in the region where the linear portion 13d on the downstream side in the rotation direction in the upper V-shaped zone of the transmission body 13 is wound around the second driven rotation body 12. Therefore, it is possible to further reduce the meshing sound of the transmission body 13 with respect to the second driven rotating body 12.

(3) In the above embodiment, in the DOHC type V-type internal combustion engine, only the intake camshafts 4A and 5A arranged in the cylinder heads 2A and 2B mounted on the banks 1A and 1B of the cylinder block 1 Although the example which attached the 1st, 2nd driven rotary bodies 11 and 12 and wound the transmission body 13 was given, it is not limited to this.

  For example, as shown in FIG. 7, in the DOHC type V-type internal combustion engine, the transmission body 13 can be wound around all the camshafts 4A, 4B, 5A, 5B. In this case, third and fourth driven rotating bodies 11A and 12A similar to the first and second driven rotating bodies 11 and 12 are attached to one shaft end of the exhaust camshafts 4B and 5B, and all of these driven rotations are performed. The transmission body 13 is wound around the bodies 11, 12, 11 </ b> A, 12 </ b> A and the driving rotary body 10.

  Also, as shown in FIG. 8, driven rotary bodies 11 and 12A are attached to the intake camshaft 4A on the first bank 1A side and the exhaust camshaft 5B on the second bank 1B side, and these two driven rotations are attached. The transmission body 13 can be wound around the bodies 11 and 12A and the driving rotary body 10. Further, as shown in FIG. 9, driven rotary bodies 11A and 12 are attached to the exhaust camshaft 4B on the first bank 1A side and the intake camshaft 5A on the second bank 1B side, and these two driven rotations are attached. The transmission body 13 can be wound around the bodies 11A, 12 and the driving rotary body 10.

  In any of these winding patterns, the transmission body vibration suppression device 20 having the configuration as described in the above embodiments can be used as appropriate, and substantially the same operations and effects as described in the above embodiments can be obtained. Can do.

  (4) The transmission body vibration suppression device 20 according to the present invention is used in the camshaft drive mechanism of the DOHC type V-type internal combustion engine in the above embodiment, but also in the camshaft drive mechanism of the OHC type V-type internal combustion engine. It can be used similarly. In the case of a camshaft drive mechanism of an OHC type V-type internal combustion engine, one camshaft for intake and exhaust is arranged in each of the first bank and the second bank of the V-shaped cylinder block, and a total of two camshafts are arranged. Although it is the structure used, the winding pattern of a transmission body becomes fundamentally the same as the said embodiment.

It is a front view showing the best embodiment of the transmission body vibration suppression device of the V type internal combustion engine concerning the present invention. It is the top view which looked at the transmission body vibration suppression apparatus of FIG. 1 from the top. It is a perspective view of the state which decomposed | disassembled the transmission body vibration suppression apparatus of FIG. It is explanatory drawing used for operation | movement description of the transmission body vibration suppression apparatus in the 1st state of the transmission body of FIG. It is explanatory drawing used for operation | movement description of the transmission body vibration suppression apparatus in the 2nd state of the transmission body of FIG. It is a front view which shows other embodiment of the transmission body vibration suppression apparatus which concerns on this invention. It is a front view which shows the other example of the V-type internal combustion engine used as the usage object of the transmission body vibration suppression apparatus which concerns on this invention. It is a front view which shows the further another example of the V-type internal combustion engine used as the usage object of the transmission body vibration suppression apparatus which concerns on this invention. It is a front view which shows the further another example of the V-type internal combustion engine used as the usage object of the transmission body vibration suppression apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder block 1A 1st bank 1B 2nd bank 4A, 5A Intake camshaft 4B, 5B Exhaust camshaft 6 Crankshaft 10 Drive rotary body 11 1st driven rotary body 12 2nd driven rotary body 13 Transmission body 13c Upper side V Linear portion 13d upstream of the rotation direction of the letter-shaped zone 13d Linear portion downstream of the rotation direction of the upper V-shaped zone 15 Idler 20 Transmitter vibration suppression device 21 First movable guide 22 Second movable guide 23 Connecting member 24 Movable weights 25, 26 Elastic body

Claims (5)

An endless transmission body straddling the first and second driven rotating bodies attached to the first and second camshafts arranged in each bank of the V-type internal combustion engine and the driving rotating body attached to the crankshaft together wound around the said upper V at each driven rotor each driven rotor between a camshaft drive mechanism portions formed by bending in a V-shaped by pulling the driven rotating body side idler portion between in the transmission body A transmission body vibration suppression device that is provided in a letter-shaped zone and suppresses vibration thereof,
A first movable guide that is pressed against a linear portion on the upstream side in the rotational direction in the upper V-shaped zone of the transmission body and is supported so as to be swingable in the swing direction of the linear portion;
A second movable guide that is pressed against the linear portion on the downstream side in the rotational direction in the upper V-shaped zone of the transmission body and is supported so as to be swingable in the swing direction of the linear portion;
A transmission body vibration suppressing device for a V-type internal combustion engine, comprising: a connecting member that connects both movable guides to link the swinging motion of both movable guides. The transmission body vibration suppression device for a V-type internal combustion engine according to claim 1,
A V-type internal combustion engine characterized in that the connecting member is a rigid member, and a vibration damping mechanism is provided on the connecting member to apply vibrations in opposite phases to the swings of the movable guides to attenuate the swings. Transmitter vibration suppression device. The transmission body vibration suppression device for a V-type internal combustion engine according to claim 2,
The vibration damping mechanism is disposed on the both sides of the movable weight in the axial direction of the connecting member and presses the movable weight from both sides in the axial direction. A transmission body vibration suppression device for a V-type internal combustion engine, characterized by comprising two elastic bodies. The transmission body vibration suppression device for a V-type internal combustion engine according to claim 3,
The elastic body vibration suppression device for a V-type internal combustion engine, wherein the two elastic bodies are set to different resonance frequencies. The transmission body vibration suppression device for a V-type internal combustion engine according to claim 1,
The connecting member vibration suppressing device for a V-type internal combustion engine, wherein the connecting member is an elastic body that presses both movable guides in a direction to separate them from each other.

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