JP5769442B2 - Auxiliary drive mechanism - Google Patents

Description

  The present invention relates to an accessory drive mechanism that is mounted on a vehicle and has a structure for transmitting rotation of an output shaft of an internal combustion engine to the accessory via a belt.

  2. Description of the Related Art Conventionally, in an internal combustion engine mounted on a vehicle, an air duct for taking in air to be introduced into an air cleaner is provided on the upper surface of the internal combustion engine, and an air intake port at the tip is opened sideways so that fresh air is taken in as much as possible. I have to.

  Conventionally, in an internal combustion engine mounted on a vehicle, for example, a configuration has been adopted in which a power transmission belt for transmitting power from the internal combustion engine to an auxiliary machine such as an alternator is disposed at a lower portion of one side surface. (For example, refer to Patent Document 1).

  Here, the conventional internal combustion engine employs a configuration in which an air duct having an air intake port is provided on the upper surface of the internal combustion engine, and a belt for transmitting power to various accessories is provided in the lower portion of the internal combustion engine. As a result, the following problems may occur.

  That is, when the intake port of the air duct is arranged on the side surface of the internal combustion engine where the belt is provided in a plan view of the internal combustion engine, when rainwater or oil adheres to the belt, it jumps from the belt. Raised rainwater or the like rides on the wind of the vehicle and reaches the air intake port, causing rainwater or the like to be taken together with the air, thereby causing problems such as fouling the air cleaner downstream thereof, and lowering the output of the internal combustion engine. There may be a problem.

JP-A-8-319846

  The present invention pays attention to the above points, and an object of the present invention is to eliminate problems caused by rain water and the like being splashed from a belt.

In other words, the auxiliary drive mechanism according to the present invention moves the belt along the extending direction of the belt, the adjustment bar , and the adjustment bar to transmit the rotational force of the output shaft of the internal combustion engine to the auxiliary machine. A slider that moves the pulley around which the belt is wound is moved to change the tension of the belt , and a screw feed mechanism that reciprocates the slider with respect to the adjustment bar . The slider moves above the belt. shielding plate covers, and the support portion for supporting so as to go added support projection provided to project from the auxiliary comprising a belt tension adjusting mechanism integrally having an arcuate guide groove provided in the adjusting bar The support protrusion is movable .

  If it is such, when rain water or an oil component adheres to the belt, it is possible to prevent rain water or the like splashed from the belt from reaching beyond the shielding plate by the shielding plate. Accordingly, an air intake port of an air duct for taking in air to be introduced into the air cleaner can be arranged above the belt, so that the design that solves the problems caused by the rain water splashing up from the belt is eliminated. The degree of freedom can be improved. Further, since the slider of the belt tension adjuster hole integrally includes the shielding plate, it is not necessary to provide the shielding plate as a separate component, and the cost can be reduced by reducing the number of components. In addition, when the belt tension is adjusted by the belt tension adjustment mechanism, the slider moves with the pulley attached to the auxiliary machine, so the shielding plate is located near the starting point of the water splashing. Can be minimized.

  ADVANTAGE OF THE INVENTION According to this invention, the malfunction which generate | occur | produces when rain water etc. jump from the belt for the power transmission in an auxiliary machinery drive mechanism can be eliminated.

The figure which shows schematically the inside of the engine room which accommodates the auxiliary machinery drive mechanism which concerns on one Embodiment of this invention. The schematic front view of the auxiliary machinery drive mechanism which concerns on the same embodiment. The perspective view which shows the principal part of the auxiliary machinery drive mechanism which concerns on the same embodiment.

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

  An engine 3, which is an internal combustion engine provided with an accessory drive mechanism according to this embodiment, is mounted in an engine room 2 formed at the front portion of the vehicle body frame 1. Specifically, as shown in FIG. 1, the engine 3 is mounted horizontally so that the axis 4a of the crankshaft 4 serving as an output shaft is horizontally oriented when viewed in plan.

  Of the long side surfaces parallel to the axis 4a of the crankshaft 4 in the engine 3, an exhaust manifold 5 is attached to the front side surface, and an intake manifold 6 is attached to the rear side surface.

  A crank pulley 12 that is a pulley supported on the crankshaft 4 and a first pulley attached to the engine 3 are provided on one side surface of the engine 3 that is orthogonal to the axis 4 a of the crankshaft 4. A pump pulley 13 which is a pulley supported on the input shaft 7a of the cooling water pump 7 which is an auxiliary machine of the engine, and a pulley which is supported on the input shaft 8a of the alternator 8 which is a second auxiliary machine attached to the engine 3. A belt 9 is provided which is wound around an alternator pulley 14 and transmits the rotation of the crankshaft 4 to an auxiliary machine.

  On the other hand, an air duct 10 to an air cleaner (not shown) is arranged on the upper surface of the engine 3 so as to extend in the direction of the axis 4 a of the crankshaft 4, and an air intake 11 at the tip of the air duct 10. Is opened laterally at a portion above the belt 9.

  Thus, the engine 3 is further provided with a belt tension adjusting mechanism 15 for changing the tension of the belt 9. The crank pulley 12, the pump pulley 13, the alternator pulley 14, the belt 9, and the belt tension adjusting mechanism 15 constitute an auxiliary machine drive mechanism 100 in the claims.

  The belt tension adjusting mechanism 15 is provided so that the relative position with the crankshaft 4 is constant. In other words, the belt tension adjusting mechanism 15 is fixed to the cylinder body 23 of the engine 3 and is separated from the cylinder body 23. An adjustment bar 16 that extends in a substantially horizontal direction and a slider 17 that is attached to the alternator pulley 14 and moves along the extending direction of the adjustment bar 16 to change the tension of the belt 9 by moving the pulley. Yes.

  Further, the slider 17 is screwed into a plate-like alternator support portion 18 for supporting the alternator pulley 14 and a bolt 21 which is orthogonal to the alternator support portion 18 and is inserted into the bolt receiver 16a of the adjust bar 16. A plate-like nut portion 19 integrally having a wearable nut 22 and a shielding plate 20 that forms a plate shape orthogonal to the alternator support portion 18 and the nut portion 19 and covers the upper side of the belt 9 are integrally provided.

  Here, the adjustment of the tension by the belt tension adjusting mechanism 15 is performed by rotating the head portion of the bolt 21 and screwing and retracting the nut portion 19 of the slider 17 with respect to the adjustment bar 16. When the nut portion 19 of the slider 17 is screwed back and forth with respect to the adjustment bar 16, the alternator support portion 18 of the slider 17 moves together. Specifically, the alternator support portion 18 supports a support projection 8b provided to protrude from the casing of the alternator 8, and when the nut portion 19 of the slider 17 is screwed back and forth, this support is supported. The protrusion 8 b receives an action from the nut portion 19 and moves in the guide groove 16 b provided in the adjustment bar 16. At this time, the shielding plate 20 maintains the relative position with the alternator pulley 14, in other words, the alternator support portion while the belt 9 is unwound from the alternator pulley 14 and is located above the portion toward the pump pulley 13. 18 and the nut portion 19 move together.

  That is, according to the configuration of the auxiliary drive mechanism 100 of the present embodiment, when rainwater or oil adheres to the power transmission belt 9, rainwater or the like splashed from the power transmission belt 9 is shielded by the shielding plate 20. It is possible to prevent the plate 20 from reaching upward. Accordingly, since the air intake port 11 of the air duct 10 for taking in the air to be introduced into the air cleaner can be disposed above the power transmission belt 9, there is a problem that occurs when rainwater or the like is splashed from the belt 9. In other words, rain water or the like splashed from the belt 9 rides on the traveling wind of the vehicle and reaches the air intake port 11, and the rain water or the like is taken in together with the air to contaminate the air cleaner downstream thereof, and the output of the engine 3. It is possible to improve the degree of freedom of design while eliminating problems such as lowering.

  Furthermore, since the slider 17 of the belt tension adjusting mechanism 15 integrally includes the shielding plate 20, it is not necessary to provide the shielding plate 20 as a separate component, and the cost can be reduced by reducing the number of components.

  In addition, when adjusting the tension of the belt 9 by the belt tension adjusting mechanism 15, the slider 17 moves together with the alternator pulley 14, so that the belt 9 is unwound from the alternator pulley 14 in the vicinity of the starting point where water jumps up. Since the shielding plate 20 is located near the part toward the pump pulley 13, the size of the shielding plate 20 can be minimized.

  The present invention is not limited to the embodiment described above.

  For example, the mechanism for moving the slider back and forth with respect to the adjustment bar is not limited to the one using the screw feed mechanism as shown in the above-described embodiment, and other mechanisms may be adopted.

  Also, the adjustment mode of the adjustment bar is not limited to that shown in the above-described embodiment as long as the relative position between the adjustment bar and the output shaft of the internal combustion engine is constant. A mode of fixing to the vehicle body frame via a fixture may be employed.

  In addition, various changes may be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Auxiliary machinery drive mechanism 3 ... Engine (internal combustion engine)
4 ... Crankshaft (output shaft)
8… Alternator (auxiliary machine)
DESCRIPTION OF SYMBOLS 9 ... Belt 15 ... Belt tension adjustment mechanism 16 ... Adjustment bar 17 ... Slider 20 ... Shielding plate

Claims (1)

A belt for transmitting the rotational force of the output shaft of the internal combustion engine to the auxiliary machine;
An adjusting bar , a slider attached to the auxiliary machine by moving along the extending direction of the adjusting bar, and moving a pulley wound around the belt to change the belt tension , and a slider with respect to the adjusting bar A belt having a screw feeding mechanism for screwing back and forth, and a slider integrally supporting a shield plate for covering the upper portion of the belt and a support projection provided by projecting from an auxiliary machine. And a tension adjusting mechanism , wherein the support protrusion is movable in an arcuate guide groove provided in the adjustment bar .

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