JP2011247155A - Device for driving auxiliary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for driving an auxiliary machine that prevents a mistake in assembling a transmission belt, while using a pulley of a device for driving an auxiliary machine which has a different specification of an auxiliary machine to be a driving object.SOLUTION: The device 1 for driving the auxiliary machine uses a rotation of an engine 2 to drive a water pump. The device includes: a crank pulley 5 fixed on a crankshaft 3; a water pump pulley 7 fixed on an input shaft 6 of the water pump; a V-ribbed belt which is wound around belt-winding surfaces 15 and 17 formed on outer peripheral surfaces of the crank pulley 5 and the water pump pulley 7, and whose belt width is set smaller than width of the belt-winding surfaces 15 and 17; and shielding plates 10 and 11 which control positions of the width of the V-ribbed belt within the width of the belt-winding surfaces 15 and 17.

Description

  The present invention relates to an accessory drive device, and more particularly to an accessory drive device that transmits rotation of an internal combustion engine to an accessory via a pulley and a belt to drive the accessory.

  In general, an auxiliary machine drive device is provided in an internal combustion engine, and drives each auxiliary machine using the rotation of the internal combustion engine.

  This type of accessory drive device includes a drive pulley attached to an output shaft of an internal combustion engine, an accessory pulley attached to an input shaft of the accessory, and a transmission belt wound around the drive pulley and the accessory pulley. And a tension pulley that is pressed against the transmission belt with a predetermined pressure so as to keep the tension of the transmission belt constant. In the accessory driving device having such a configuration, the transmission belt rotates around the rotation of the driving pulley as the output shaft of the internal combustion engine rotates. In addition, the auxiliary machine is driven by the rotation of the auxiliary machine pulley according to the circumferential driving of the transmission belt. In general, a transmission belt is a so-called V-ribbed belt in which a plurality of ribs having a substantially V-shaped cross section are formed on one surface and the other surface is formed flat.

  By the way, the auxiliary machines provided in the internal combustion engine, that is, the auxiliary machines driven by the auxiliary machine driving device, vary depending on the type and specifications of the vehicle on which the internal combustion engine is mounted, and the number thereof is not constant. For example, a conventional vehicle (hereinafter referred to as a conventional vehicle) that runs only with the power of an internal combustion engine has a plurality of auxiliary devices such as an alternator, an air conditioner compressor, and a water pump as auxiliary devices provided in the internal combustion engine. . On the other hand, in a hybrid vehicle that runs with the power of the internal combustion engine and the electric motor, there are few auxiliary machines that are driven by the auxiliary machine drive device. For example, as an auxiliary machine drive device applied to this type of hybrid vehicle, an auxiliary machine driven using the rotation of an internal combustion engine is known as only a water pump (see, for example, Patent Document 1). .

  Conventionally, in each of the accessory driving devices having different numbers of accessories to be driven as described above, pulleys and V-ribbed belts of the same specification are used to share parts.

JP 2007-231910 A

  However, in the hybrid vehicle accessory driving apparatus described in Patent Document 1 described above, since the number of auxiliary machines to be driven is smaller than that of the conventional auxiliary driving apparatus, the load is small. However, the number of ribs of the V-ribbed belt has been set more than necessary in accordance with the specifications of the driving drive device of the conventional vehicle. Accordingly, the tension of the V-ribbed belt has been set higher than necessary according to the number of ribs. For this reason, since the belt width of the V-ribbed belt is wide, the material cost is increased. Further, since the tension of the V-ribbed belt is high, the friction generated between the V-ribbed belt and each pulley is also deteriorated.

  In this case, in order to reduce the material cost and friction, it is also possible to change the design of the number of ribs of the V-ribbed belt and the pulley width of each pulley for each accessory driving device with a different number of accessories to be driven. It is done. However, even in this case, the cost increases due to a design change for each auxiliary machine driving device.

  Therefore, it is conceivable that each pulley remains as a common pulley and only the number of ribs of the V-ribbed belt is changed according to the specifications of the accessory driving device of the hybrid vehicle.

  However, in this case, since the belt width of the V-ribbed belt is set smaller than the pulley width of each pulley, erroneous assembly is caused when the V-ribbed belt is wound around each pulley, that is, when the V-ribbed belt is assembled to each pulley. There was a problem that it might occur.

  The present invention has been made in order to solve the above-described conventional problems. The transmission belt is erroneously assembled while using a pulley of an accessory driving device having different specifications of the accessory to be driven. It is an object of the present invention to provide an accessory drive device that can be prevented.

  In order to achieve the above object, an auxiliary machine driving apparatus according to the present invention is (1) an auxiliary machine driving apparatus that drives an auxiliary machine by utilizing the rotation of the internal combustion engine, and is fixed to the output shaft of the internal combustion engine. A drive pulley, an auxiliary pulley fixed to the input shaft of the auxiliary device, a belt winding surface formed on an outer peripheral surface of the drive pulley and the auxiliary pulley, and a belt width of the drive pulley A transmission belt set smaller than a width of the belt winding surface of the pulley and the auxiliary pulley, and a width direction of the transmission belt at least within a width of the belt winding surface of one of the drive pulley and the auxiliary pulley And a restricting member for restricting the position.

  With this configuration, the auxiliary machine driving device according to the present invention has a regulating member that regulates the position in the width direction of the transmission belt within the width of at least one belt winding surface of the driving pulley and the auxiliary pulley. Transmission that is set smaller than the width of the belt wrapping surface of each pulley according to the specifications of the vehicle while using the drive pulley and auxiliary pulley of the auxiliary drive device with different specifications of the auxiliary machine to be driven When the belt is assembled to each pulley, the position of the transmission belt in the width direction is regulated by the regulating member. Therefore, the auxiliary machine drive device according to the present invention can prevent erroneous assembly of the transmission belt while using the pulley of the auxiliary machine drive device having different specifications of the auxiliary machine to be driven.

  An auxiliary machine driving device according to the present invention is the auxiliary machine driving device according to the above (1), wherein (2) the driving pulley and the auxiliary pulley are arranged so that the belt winding surface extends in a circumferential direction. The transmission belt has a plurality of rib portions fitted into the rib groove portions, and the number of the rib portions is smaller than the number of the rib groove portions.

  With this configuration, the accessory driving apparatus according to the present invention has a smaller number of rib portions formed on the transmission belt than the number of rib grooves formed on the belt winding surface of the driving pulley and the accessory pulley. The tension of the transmission belt set according to the number of rib portions of the transmission belt can be reduced in accordance with the decrease in the number of rib portions. Thereby, the tension of the transmission belt can be optimized in accordance with the specifications of the accessory driving device. As a result, friction generated between the transmission belt and each pulley can be reduced.

  Moreover, the accessory drive apparatus according to the present invention can reduce the material cost of the transmission belt by reducing the number of rib portions.

  In addition, an auxiliary machine driving device according to the present invention is the auxiliary machine driving device according to (1) or (2), wherein (3) the restriction member is the driving pulley and a belt winding surface of the auxiliary pulley. It has the structure which is a shielding board which covers a part of width direction.

  With this configuration, in the auxiliary machine driving device according to the present invention, the restricting member is a shielding plate that covers a part of the driving pulley and the belt winding surface of the auxiliary machine pulley in the width direction, so that it matches the width of the transmission belt. The range in the width direction of the belt winding surface of each pulley around which the transmission belt is wound can be directly restricted. For this reason, the auxiliary machine drive device according to the present invention can reliably prevent erroneous assembly of the transmission belt.

  Further, an auxiliary machine drive device according to the present invention is the auxiliary machine drive device according to (3), wherein (4) the shielding plate is positioned on a belt winding surface of the drive pulley and the auxiliary pulley. An end surface is formed, and the end surface is parallel to the groove direction of the rib groove portion.

  With this configuration, the auxiliary drive device according to the present invention is such that the end face of the shielding plate positioned on the belt winding surface of each pulley is parallel to the groove direction of the rib groove portion. The end face guides the transmission belt to be wound around each pulley accurately. Therefore, the auxiliary machine drive device according to the present invention can reliably prevent erroneous assembly of the transmission belt.

  An auxiliary machine drive device according to the present invention is the auxiliary machine drive device according to (3) or (4), wherein (5) the shielding plate is provided in the internal combustion engine, and the drive is performed from the internal combustion engine. It is preferably formed so as to protrude toward the pulley and the auxiliary pulley.

  An auxiliary machine drive device according to the present invention is the auxiliary machine drive device according to the above (3) or (4), wherein (6) the drive pulley and the auxiliary pulley are surfaces facing the internal combustion engine. It has a pulley cover provided on the opposite pulley front surface, and the shield plate is formed on the outer edge of the pulley cover.

  With this configuration, the auxiliary drive device according to the present invention has the shielding plate formed on the outer edge of the pulley cover, so that the pulley cover prevents radiation noise from each pulley and prevents the transmission belt from being assembled incorrectly. be able to.

  Furthermore, an auxiliary machine drive device according to the present invention is the auxiliary machine drive device according to the above (1) or (2), further comprising: (7) a belt tensioner that adjusts the tension of the transmission belt; Is a protrusion formed so as to protrude from the internal combustion engine toward the transmission belt, and the protrusion is between the drive pulley and the auxiliary pulley and between the auxiliary pulley and the belt tensioner. And it has the structure located on the circumference track | orbit of the said transmission belt between the said belt tensioner and the said drive pulley.

  With this configuration, in the auxiliary machine driving device according to the present invention, the protrusion is provided between the drive pulley and the auxiliary pulley, between the auxiliary machine pulley and the belt tensioner, and between the belt tensioner and the drive pulley. The internal combustion engine is formed so as to be positioned on the orbit. For this reason, when a transmission belt is assembled | attached to each pulley and belt tensioner, the position of the width direction of a transmission belt can be controlled with a projection part. Therefore, the auxiliary machine drive device according to the present invention can reliably prevent erroneous assembly of the transmission belt.

  ADVANTAGE OF THE INVENTION According to this invention, the accessory drive device which can prevent the incorrect assembly | attachment of a transmission belt can be provided, utilizing the pulley of the accessory drive device from which the specification of the accessory used as drive object differs. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram showing a state in which an accessory driving device according to a first embodiment of the present invention is attached to an internal combustion engine. It is the schematic which compared the belt layout of the auxiliary machine drive device which concerns on the 1st Embodiment of this invention, and the belt layout of the auxiliary machine drive device of another structure. 1 is a perspective view showing a crank pulley according to a first embodiment of the present invention. It is sectional drawing of the auxiliary machinery drive device which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows a part of auxiliary machinery drive device concerning the 1st Embodiment of this invention, Comprising: It is an expanded sectional view which shows the state by which the V-ribbed belt was wound around the water pump pulley. It is sectional drawing of the crank pulley applied to the auxiliary machinery drive device which concerns on the 2nd Embodiment of this invention. It is a schematic block diagram which shows the state with which the auxiliary machinery drive device which concerns on the 3rd Embodiment of this invention was attached to the internal combustion engine. It is an expanded sectional view of the V-ribbed belt and projection part which concern on the 3rd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
With reference to FIG. 1, an auxiliary machine driving apparatus according to a first embodiment of the present invention will be described.

  In the present embodiment, a case will be described in which the accessory drive device according to the present invention is applied to an accessory drive device 1 for driving an accessory of an engine mounted on a hybrid vehicle (hereinafter simply referred to as a hybrid vehicle). .

  As shown in FIG. 1, the accessory drive device 1 is provided in an engine 2 as an internal combustion engine, and drives a water pump (not shown) by utilizing the rotation of the engine 2. In the hybrid vehicle according to the present embodiment, the auxiliary machinery driven by the accessory driving device 1 using the rotation of the engine 2 is only a water pump, and is a so-called gasoline vehicle that runs only with the power of the engine 2. The number is set smaller than that.

As the engine 2, a known power device that outputs power by burning a mixture of hydrocarbon fuel such as gasoline or light oil and air in a combustion chamber of a cylinder (not shown) is used. The engine 2 performs a series of steps of intake, compression, combustion and exhaust of the air-fuel mixture in the combustion chamber, thereby reciprocating the piston in the cylinder as an output shaft connected to the piston so that power can be transmitted. The crankshaft 3 is rotated. The engine 2 has a chain cover 2a on its side surface, and the accessory drive device 1 is disposed on the front side of the chain cover 2a. A chain drive mechanism including a timing chain and various sprockets is disposed in the chain cover 2a.
A detailed description of the accessory drive device 1 will be described later.

  Here, when the same engine 2 is mounted on vehicles having different specifications, for example, a gasoline vehicle and a hybrid vehicle, the accessory driving device in the engine 2 is set to a belt layout corresponding to the specification of the vehicle.

  Hereinafter, a belt layout when the same engine 2 is mounted on a gasoline vehicle and a hybrid vehicle having different specifications will be described with reference to FIG.

  As shown in FIG. 2, when the engine 2 (see FIG. 1) is mounted on a gasoline vehicle, the auxiliary machines driven by the auxiliary machine drive device 101 are an alternator and an air conditioner compressor in addition to the water pump. Therefore, in the accessory drive device 101, a belt layout in which the V-ribbed belt 108 indicated by the dotted line in FIG. 2 is wound around the alternator pulley 102 and the air conditioner compressor pulley 103 in addition to the crank pulley 5 and the water pump pulley 7. It becomes.

  In addition, in the belt layout corresponding to the gasoline vehicle, there are more auxiliary machines to be driven than in the hybrid vehicle, and thus a relatively large force is required to drive these auxiliary machines. That is, in this belt layout, the load applied to the V-ribbed belt 108 is relatively large. Therefore, in order to transmit the rotation of the crank pulley 5 to the auxiliary pulleys via the V-ribbed belt 108, it is necessary to increase the frictional force generated between each pulley and the V-ribbed belt 108. For this reason, the belt width of the V-ribbed belt 108 used in this belt layout is set to be relatively large, and the number of rib portions formed is also relatively large (for example, about seven). Further, the tension of the V-ribbed belt 108 is set relatively high according to the number of rib portions.

  On the other hand, when the engine 2 (see FIG. 1) is mounted on the hybrid vehicle according to the present embodiment, as described above, the auxiliary machinery driven by the auxiliary machinery driving device 1 is only the water pump. In the auxiliary machine driving device 1, the belt layout is configured such that the V-ribbed belt 8 indicated by a thick solid line in FIG. 2 is wound around the crank pulley 5 and the water pump pulley 7 common to the auxiliary machine driving device 101.

  Also, in the belt layout for hybrid vehicles, only water pumps are the auxiliary equipment to be driven, and the number of them is smaller than that of gasoline vehicles. Compared with a small force. That is, in this belt layout, the load applied to the V-ribbed belt 8 is smaller than that of a gasoline vehicle. Therefore, it is not necessary to increase the frictional force generated between each pulley and the V-ribbed belt 8 as in a gasoline vehicle.

  However, conventionally, when the same engine 2 is mounted on a gasoline vehicle and a hybrid vehicle having different specifications, in order to make the parts common, the belt layout of the hybrid vehicle has a V-ribbed belt even though the load is small. A V-ribbed belt having the same belt width as 108 belt widths was used. For this reason, since the belt width becomes larger than necessary, there has been a problem that the material cost of the V-ribbed belt is high.

  Further, since a V-ribbed belt having the same belt width as the belt width of the V-ribbed belt 108 is used, the tension of the V-ribbed belt is set higher than necessary according to the number of rib portions. For this reason, the problem that the axial load of each pulley and the friction which arises between each pulley and V-ribbed belt worsen occurred. In addition, there is a risk that the fuel consumption is deteriorated due to such a problem.

  In view of such a problem, for example, measures such as lowering the tension while using a wide belt V-ribbed belt can be considered, but in this case, the V-ribbed belt slips due to the change in tension, There is a risk of impairing the function and reliability of the accessory drive unit itself.

  Therefore, in the belt layout of the hybrid vehicle, the above-described problems can be solved by using the V-ribbed belt 8 having a belt width smaller than the belt width of the V-ribbed belt 108 according to such a load.

  However, in this case, since each pulley set corresponding to the V-ribbed belt 108 having a large belt width is used as it is, the position in the width direction is not determined when the V-ribbed belt 8 having a small belt width is assembled to each pulley. A new problem arises that there is a risk of incorrect assembly.

  Therefore, in the present embodiment, the auxiliary drive device 1 is configured as described below in order to prevent the above-described problem of erroneous assembly.

  Hereinafter, with reference to FIG. 1 and FIG. 3, the detailed description of the accessory drive apparatus 1 according to the present embodiment will be described.

  As shown in FIG. 1, the accessory drive device 1 includes a crank pulley 5 fixed to the crankshaft 3, a water pump pulley 7 fixed to the input shaft 6 of the water pump, and the crank pulley 5 and the water pump pulley 7. A V-ribbed belt 8 that is wound around, an auto tensioner 9 that maintains the tension of the V-ribbed belt 8 at an appropriate tension by the action of a built-in coil spring, and shielding plates 10 and 11 for regulating the position of the V-ribbed belt 8 in the width direction. 4).

  The crank pulley 5 in the present embodiment constitutes a drive pulley according to the present invention, and the water pump pulley 7 constitutes an auxiliary pulley according to the present invention. Further, the V-ribbed belt 8 in the present embodiment constitutes a transmission belt according to the present invention, and the shielding plates 10 and 11 constitute a regulating member according to the present invention.

  In addition, the accessory drive device 1 according to the present embodiment uses the rank pulley 5 and the water pump pulley 7 of the accessory drive device 101 having different specifications of the accessory to be driven.

  As shown in FIG. 3, the crank pulley 5 has flange portions 5a and 5b formed at both ends in the axial direction, and a belt winding surface on which the V-ribbed belt 8 is wound around an outer peripheral surface excluding the flange portions 5a and 5b. 15 is formed.

Further, as described above, since the crank pulley 5 is the same as the auxiliary drive device 101 applied to the gasoline vehicle, the crank pulley 5 is adapted to the belt width of the V-ribbed belt 108 used in the auxiliary drive device 101. The width of the belt winding surface 15 is set to a width W _P (hereinafter referred to as pulley width W _P ). That is, the pulley width W _P, of the accessory drive the crank pulley 5 is used, the maximum of V-ribbed belt having a belt width, allows wound a V-ribbed belt 108 used in the accessory drive system 101 in this embodiment It is considered as a size.

  A belt winding surface 15 of the crank pulley 5 is provided with a plurality of V-shaped rib grooves 15a each having a plurality of crests and troughs formed in order in the axial direction, that is, the width direction. The plurality of rib grooves 15 a are formed so as to extend in the circumferential direction of the belt winding surface 15. A rib portion 8a of a V-ribbed belt 8 described later is fitted into the plurality of rib grooves 15a.

As shown in FIG. 5, the water pump pulley 7 has substantially the same configuration as that of the crank pulley 5, and thus detailed description thereof will be omitted. However, like the crank pulley 5, flange portions 7 a and 7 b are provided at both axial ends. The belt winding surface 17 is formed on the outer peripheral surface excluding the flange portions 7a and 7b. Further, the belt winding surface 17 having a groove width W _P, a plurality of ribs grooves 17a of the rib portion 8a of the V-ribbed belt 8 is fitted is formed.

  In the present embodiment, the number of rib groove portions 15a and rib groove portions 17a is set to seven. However, the number is not limited to this, and may be set to an arbitrary number according to the specifications of auxiliary machine driving device 1. .

  As shown in FIG. 3, the V-ribbed belt 8 is an endless belt, and its outer surface is formed in a flat shape. The V-ribbed belt 8 is formed with a plurality of rib portions 8 a extending on the inner side surface in the circumferential direction of the V-ribbed belt 8. When the V-ribbed belt 8 is wound around the crank pulley 5 and the water pump pulley 7, the plurality of rib portions 8a are fitted into the rib grooves 15a and 17a of the crank pulley 5 and the water pump pulley 7, respectively. ing. Thus, by fitting the rib portion 8a into the rib groove portions 15a and 17a, the contact area of the V-ribbed belt 8 with respect to the crank pulley 5 and the water pump pulley 7 is increased, and between these pulleys and the V-ribbed belt 8 is increased. There is an effect of increasing the generated frictional force.

The belt width W _B of the V-ribbed belt 8 is set to be smaller than the groove width W _P of the crank pulley 5 and the water pump pulley 7. Further, in accordance with the belt width W _B, the number of ribs 8a of V-ribbed belt 8 is set to three less than the number of ribs groove 15a and the rib groove 17a.

  As shown in FIG. 4, the shielding plate 10 is provided below the chain cover 2 a of the engine 2 corresponding to the crank pulley 5, and is formed so as to protrude from the chain cover 2 a toward the crank pulley 5.

  The shielding plate 10 covers a part of the belt winding surface 15 of the crank pulley 5 in the width direction. The shielding plate 10 covers a part of the belt winding surface 15 in the width direction so as to regulate the position in the width direction of the V-ribbed belt 8 within the width of the belt winding surface 15.

  The shielding plate 11 is provided above the chain cover 2 a corresponding to the water pump pulley 7 and is formed so as to protrude from the chain cover 2 a toward the water pump pulley 7. The shielding plate 11 covers a part of the belt winding surface 17 of the water pump pulley 7 in the width direction. The shielding plate 11 covers a part of the belt winding surface 17 in the width direction so as to regulate the position in the width direction of the V-ribbed belt 8 within the width of the belt winding surface 17.

  The shielding plates 10 and 11 may be configured to be fixed to the chain cover 2a by a fastening member such as a bolt (not shown), or may be configured to be formed integrally with the chain cover 2a.

Next, the details of the shielding plates 10 and 11 will be described with reference to FIG.
Since the shielding plate 10 and the shielding plate 11 have the same configuration, the shielding plate 10 will be described below as an example.

As shown in FIG. 5, the shield plate 10, a portion of the width direction of the belt winding surface 17, i.e. out of the pulley width W _P, wound around a V-ribbed belt 8 to a proper winding position of the water pump pulley 7 It extends in the width direction of the water pump pulley 7 so as to cover the excess with a region (W _P -W width direction of the region represented by _B) when. In other words, the shielding plate 10 covers the unnecessary four rib groove portions 17a located on the chain cover 2a side among the seven rib groove portions 17a formed on the belt winding surface 17 in the width direction of the water pump pulley 7. It extends to. In the present embodiment, an appropriate winding position of the V-ribbed belt 8 refers to a position on the belt winding surface 17 that is farthest from the front side, that is, the chain cover 2a.

  Further, the shielding plate 10 is formed with an end surface 10 a, and the end surface 10 a is positioned on the belt winding surface 17. The end surface 10a is parallel to the groove direction of the rib groove portion 17a of the water pump pulley 7. When the V-ribbed belt 8 is wound around the water pump pulley 7, the end surface 10a comes into contact with the side surface of the V-ribbed belt 8 and the chain cover of the V-ribbed belt 8 The movement to the 2a side is regulated. Thereby, the V-ribbed belt 8 is guided to an appropriate winding position.

  Although not shown in the present embodiment, the shielding plate 10 is formed to extend over at least a predetermined range in the circumferential direction around which the V-ribbed belt 8 is wound, of the outer periphery of the water pump pulley 7. ing. The shielding plate 10 is not limited to the predetermined range in the circumferential direction of the water pump pulley 7 around which the V-ribbed belt 8 is wound, and may be any device that can regulate the position in the width direction of the V-ribbed belt 8. Among these, it may be formed so as to extend only in a specific range, or may be formed so as to extend over the entire outer periphery of the water pump pulley 7. Further, a plurality of narrow shielding plates 10 may be provided at predetermined intervals in the circumferential direction of the water pump pulley 7.

  Although the shielding plate 11 is different from the shielding plate 10 in the mounting position with respect to the chain cover 2a, the configuration thereof is the same as that of the shielding plate 10, and thus detailed description thereof is omitted.

As described above, the accessory driving apparatus 1 according to the present embodiment is a shield that regulates the position in the width direction of the V-ribbed belt 8 within the width of the belt winding surfaces 15 and 17 of the crank pulley 5 and the water pump pulley 7. The configuration includes the plates 10 and 11. For this reason, for example, while using the crank pulley 5 and the water pump pulley 7 of the accessory driving device having different specifications of the auxiliary machine to be driven, the belt winding surface 15 of each pulley according to the specifications of the vehicle. , when assembling a V-ribbed belt 8 which is set smaller than the groove width W _P of 17 to the pulleys, the widthwise position of the V-ribbed belt 8 is restricted by the shielding plates 10 and 11. That is, the shielding plates 10 and 11 can directly limit the range in the width direction of the belt winding surfaces 15 and 17 of the pulleys around which the V-ribbed belt 8 is wound.

  Further, in the accessory drive device 1 according to the present embodiment, the end surfaces 10a and 11a of the shielding plates 10 and 11 positioned on the belt winding surfaces 15 and 17 of the pulleys are parallel to the groove direction of the rib grooves 15a and 17a. Therefore, when the V-ribbed belt 8 is assembled, the end faces 10a and 11a can guide the V-ribbed belt 8 to be wound around each pulley accurately.

  Therefore, the auxiliary machine drive device 1 according to the present embodiment uses the crank pulley 5 and the water pump pulley 7 of the auxiliary machine drive device having different specifications of the auxiliary machine to be driven, and misassembles the V-ribbed belt 8. The sticking can be surely prevented.

  Further, in the accessory drive device 1 according to the present embodiment, the number of rib portions 8a formed on the V-ribbed belt 8 is smaller than the number of rib groove portions 15a and 17a formed on the belt winding surfaces 15 and 17. Usually, the tension of the V-ribbed belt 8 set according to the number of rib portions of the V-ribbed belt can be reduced in accordance with the decrease in the number of rib portions 8a. As a result, the tension of the V-ribbed belt 8 can be optimized according to the specifications of the accessory drive device 1. As a result, friction generated between the V-ribbed belt 8 and each pulley can be reduced.

  Further, the accessory drive device 1 according to the present embodiment can reduce the material cost of the V-ribbed belt 8 by reducing the number of rib portions 8a.

  In the present embodiment, the shielding plates 10 and 11 are provided so as to correspond to both the crank pulley 5 and the water pump pulley 7. However, the present invention is not limited to this. For example, the crank pulley 5 or the water pump pulley 7 is used. The structure which provided the shielding board corresponding to any one of these may be sufficient.

(Second Embodiment)
Next, with reference to FIG. 6, an auxiliary machine driving apparatus according to a second embodiment of the present invention will be described.

  In the accessory driving device according to the present embodiment, the auxiliary device driving device according to the first embodiment of the present invention is provided with a shielding plate for regulating the position of the V-ribbed belt in the width direction of the crank pulley and the water pump pulley. Although different in that it is formed on a pulley cover attached to each pulley, the other configurations are substantially the same. Accordingly, description will be made using the same reference numerals as those in the first embodiment shown in FIGS. 1 to 5, and only differences will be described in detail. In the present embodiment, since the crank pulley and the water pump pulley to which the pulley cover is attached have substantially the same configuration, the following description will be made taking the crank pulley as an example.

  As shown in FIG. 6, in the accessory drive device 21 according to the present embodiment, the crank pulley 5 has a pulley cover 25 attached to the crank pulley front surface opposite to the crank pulley back surface facing the chain cover 2 a of the engine 2. It has been.

  Specifically, the pulley cover 25 is attached to the side surface of the outer peripheral portion of the crank pulley 5 by a fastening member such as a bolt at an outer edge portion 25a corresponding to the outer peripheral portion thereof, and blocks radiation sound from the crank pulley 5. Yes. The pulley cover 25 is formed of a relatively light material such as a resin material. The crank pulley front surface in the present embodiment corresponds to the pulley front surface in the present invention.

  A shield plate 25 b extending in the width direction of the belt winding surface 15 is formed on the outer edge portion 25 a of the pulley cover 25. The function of the shielding plate 25 b is the same as the function of the shielding plate 10, and the position in the width direction of the V-ribbed belt 8 within the width of the belt winding surface 15 is covered by covering a part of the belt winding surface 15 in the width direction. Is to regulate.

  In the present embodiment, since it is formed so as to extend from the front side of the crank pulley toward the chain cover 2a (see FIG. 4), the proper winding position of the V-ribbed belt 8 (see FIG. 3) is Unlike the first embodiment, the belt winding surface 15 is located on the back side of the crank pulley, that is, the position closest to the chain cover 2a. The region of the belt winding surface 15 covered by the shielding plate 25b is an extra region when the V-ribbed belt 8 is wound around an appropriate winding position of the crank pulley 5 as in the first embodiment. Of the seven rib grooves 15a (see FIG. 3) formed on the belt winding surface 15, there are four unnecessary rib grooves 15a located on the front side of the crank pulley.

  As described above, in the accessory drive device 21 according to the present embodiment, the shielding plate 25b is formed on the outer edge portion 25a of the pulley cover 25, so that the radiated sound from the crank pulley 5 and the water pump pulley 7 is generated by the pulley cover 25. Incorrect assembly of the V-ribbed belt 8 can be prevented.

  In the present embodiment, the pulley cover 25 is attached to both the crank pulley 5 and the water pump pulley 7. However, the present invention is not limited to this. For example, the pulley cover 25 is attached to either the crank pulley 5 or the water pump pulley 7. It may be. In this case, the shielding plate 25b is formed only on the pulley to which the pulley cover 25 is attached. Even when the pulley cover 25 is attached to both the crank pulley 5 and the water pump pulley 7, the shielding plate 25 b may be formed only on one of the pulley covers 25.

  In the present embodiment, the shielding plate 25b is formed integrally with the outer edge portion 25a of the pulley cover 25. However, the present invention is not limited to this. For example, the shielding plate 25b configured separately from the pulley cover 25 is connected to the pulley. The structure fixed to the outer edge part 25a of the cover 25 via a fastening member etc. may be sufficient.

(Third embodiment)
Next, with reference to FIGS. 7 and 8, an accessory driving apparatus according to a third embodiment of the present invention will be described.

  In the accessory driving device according to the present embodiment, the accessory driving device according to the first embodiment of the present invention is different from the shielding plate for regulating the position in the width direction of the V-ribbed belt in the width direction position of the V-ribbed belt. Although different in that a restricting projection is provided, other configurations are substantially the same. Accordingly, description will be made using the same reference numerals as those in the first embodiment shown in FIGS. 1 to 5, and only differences will be described in detail.

  As shown in FIG. 7, the accessory drive device 31 according to the present embodiment is for regulating the position in the width direction of the crank pulley 5, the water pump pulley 7, the V-ribbed belt 8, the auto tensioner 9, and the V-ribbed belt 8. The protrusion 33 is included. The auto tensioner 9 in the present embodiment constitutes a belt tensioner according to the present invention, and the protrusion 33 constitutes a regulating member according to the present invention.

  The crank pulley 5, the water pump pulley 7, the V-ribbed belt 8, and the auto tensioner 9 have the same configuration as that of the first embodiment.

  The protrusion 33 is positioned on the orbit of the V-ribbed belt 8 between the crank pulley 5 and the water pump pulley 7, between the water pump pulley 7 and the auto tensioner 9, and between the auto tensioner 9 and the crank pulley 5. The chain cover 2a is provided.

  Specifically, as shown in FIG. 8, the protrusion 33 is fixed to the chain cover 2a by a fastening member such as a bolt (not shown). The protrusion 33 may be formed integrally with the chain cover 2a.

The protrusion 33 is formed so as to protrude from the chain cover 2a to the front side, that is, the V-ribbed belt 8 side. That is, the protrusion 33 has a maximum corresponding to the pulley width W _P (see FIG. 3) so that the position in the width direction of the V-ribbed belt 8 set to the belt width W _B (see FIG. 3) is regulated to an appropriate position. Only four rib portions (portions indicated by dotted lines in the figure) of the V-ribbed belt having a belt width of, that is, the V-ribbed belt 108 used in the accessory drive device 101 in this embodiment, protrude toward the V-ribbed belt 8 side.

  The protrusion 33 has an end surface 33a on the V-ribbed belt 8 side, and this end surface 33a abuts against the side surface of the V-ribbed belt 8 when the V-ribbed belt 8 is wound around the crank pulley 5 and the water pump pulley 7. Thus, movement of the V-ribbed belt 8 toward the chain cover 2a is restricted. As a result, the V-ribbed belt 8 is guided to appropriate winding positions of the crank pulley 5 and the water pump pulley 7.

  As described above, in the accessory drive device 31 according to the present embodiment, the protrusion 33 has the protrusion 33 between the crank pulley 5 and the water pump pulley 7, the water pump pulley 7 and the auto tensioner 9, and the auto tensioner 9. Is formed on the chain cover 2 a so as to be positioned on the orbit of the V-ribbed belt 8 between the belt pulley 5 and the crank pulley 5. For this reason, when the V-ribbed belt 8 is assembled to each pulley and the auto tensioner 9, the position of the V-ribbed belt 8 in the width direction can be regulated by the protrusion 33. Therefore, the auxiliary machine drive device 31 according to the present embodiment can reliably prevent erroneous assembly of the V-ribbed belt 8.

  In the present embodiment, protrusions 33 are provided between the crank pulley 5 and the water pump pulley 7, between the water pump pulley 7 and the auto tensioner 9, and between the auto tensioner 9 and the crank pulley 5, respectively. Although it was set as the structure provided, it is not restricted to this, For example, the structure which provides the projection part 33 in one place or two places among the said installation positions so that it may become a reference | standard at the time of the assembly | attachment of the V-ribbed belt 8 may be sufficient.

In each embodiment described above, the belt width of the V-ribbed belt 8 and the belt width W _B, was three and the number of ribs 8a, not limited to this, the number of the belt width W _B and the rib portion 8a For example, it is preferable that the belt width and the number of rib portions are optimally set as appropriate in accordance with the number and type of auxiliary devices to be driven.

  In each of the above-described embodiments, the V-ribbed belt 8 is used as the transmission belt. However, the configuration is not limited thereto, and for example, a configuration using a transmission belt without the rib portion 8a may be used. However, a configuration using a transmission belt in which the rib portion 8a has another shape may be employed. In this case, the belt wrapping surfaces 15 and 17 of the crank pulley 5 and the water pump pulley 7 have a configuration in which the rib groove portions 15a and 17a are omitted, or ribs having a shape that matches the shape of the rib portion that is formed in another shape. It is preferable that the groove is formed.

  As described above, the accessory driving device according to the present invention can prevent the assembly of the transmission belt while using the pulley of the accessory driving device having different specifications of the accessory to be driven. The rotation of the internal combustion engine is transmitted to the auxiliary machine via a pulley and a belt, and is useful for an auxiliary machine driving apparatus that drives the auxiliary machine.

1, 21, 31 Auxiliary drive 2 Engine (Internal combustion engine)
2a Chain cover (internal combustion engine)
3 Crankshaft (output shaft)
5 Crank pulley (drive pulley)
6 Input shaft 7 Water pump pulley (auxiliary pulley)
8 V-ribbed belt (power transmission belt)
8a Rib 9 Auto tensioner (belt tensioner)
10, 11, 25b Shield plate (regulating member)
10a, 11a, 33a End face 15, 17 Belt winding surface 15a, 17a Rib groove part 25 Pulley cover 25a Outer edge part 33 Projection part (regulating member)

Claims (7)

An accessory drive device that drives an accessory by utilizing rotation of an internal combustion engine,
A drive pulley fixed to the output shaft of the internal combustion engine;
An accessory pulley fixed to the input shaft of the accessory,
The belt is wound around a belt winding surface formed on the outer peripheral surface of the drive pulley and the auxiliary machine pulley, and the belt width is set smaller than the width of the belt winding surface of the drive pulley and the auxiliary machine pulley Belt,
And a restricting member that restricts a position in the width direction of the transmission belt within a width of the belt winding surface of at least one of the drive pulley and the accessory pulley. The drive pulley and the auxiliary pulley have a plurality of rib grooves formed on the belt winding surface so as to extend in the circumferential direction,
The transmission belt has a plurality of rib portions that fit into the rib groove portions,
The accessory driving device according to claim 1, wherein the number of the rib portions is smaller than the number of the rib groove portions.   3. The accessory driving apparatus according to claim 1, wherein the restricting member is a shielding plate that covers a part in a width direction of a belt winding surface of the driving pulley and the accessory pulley. 4. The shield plate is formed with an end surface located on a belt winding surface of the drive pulley and the auxiliary pulley,
The accessory driving device according to claim 3, wherein the end surface is parallel to a groove direction of the rib groove portion.   5. The auxiliary device according to claim 3, wherein the shielding plate is provided in the internal combustion engine and is formed to protrude from the internal combustion engine toward the drive pulley and the auxiliary pulley. Machine drive device. The drive pulley and the auxiliary pulley have a pulley cover provided on the front surface of the pulley opposite to the surface facing the internal combustion engine,
The accessory driving device according to claim 3 or 4, wherein the shielding plate is formed on an outer edge portion of the pulley cover. A belt tensioner for adjusting the tension of the transmission belt;
The restriction member is a protrusion formed so as to protrude from the internal combustion engine toward the transmission belt,
The protrusion is positioned on the orbit of the transmission belt between the drive pulley and the accessory pulley, between the accessory pulley and the belt tensioner, and between the belt tensioner and the drive pulley. The auxiliary machine drive device according to claim 1 or 2, wherein

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