JP5888602B2 - Auxiliary drive - Google Patents

Description

  The present invention relates to an accessory drive device, and more particularly, to an accessory drive device driven by rotation of a crank pulley.

6 and 7, reference numeral 101 denotes an internal combustion engine mounted horizontally on the vehicle, 102 denotes a cylinder block, 103 denotes a cylinder head, 104 denotes a cylinder head cover, and 105 denotes an oil pan. The cylinder block 102 and the cylinder head 103 constitute an engine body 106.
A cover (chain case) 107 is fastened to the engine body 106 at a predetermined position with a plurality of bolts at the right end. Specifically, the cover 107 includes first to fourth front bolts 108A to 108D disposed upward from the lower portion at the front portion, and a first portion disposed upward from the lower portion at the rear portion. It is fastened to the right end portion of the engine body 106 by the eighth rear bolts 109A to 109H and further by the first to third central bolts 110A to 110C arranged in the center and in the front-rear direction. The cover 107 includes first to fourth front bosses 108A to 108D, first to eighth rear bolts 109A to 109H, and first to third central bolts 110A to 110C. 111A to 111D / first to eighth rear bosses 112A to 112H / first to third central bosses 113A to 113C are provided at predetermined locations.
A crankshaft 114 that is oriented in the vehicle width direction (left-right direction) and has an end portion 114A that passes through the cover 107 and protrudes to the right and outward is pivotally supported at the central portion of the lower portion of the cylinder block 102. . A crank pulley 115 is attached to the protruding end 114A of the crankshaft 114. As shown in FIGS. 6 and 8, the crank pulley 115 rotates in the clockwise rotation direction R in a side view from the right side.

The engine body 106 is provided with an air conditioning compressor 117 including an air conditioning compressor pulley 116, a water pump 119 including a water pump pulley 118, and an auxiliary machine (alternator) 121 including an auxiliary machine pulley 120. .
The air-conditioning compressor pulley 116 is supported by the air-conditioning compressor pulley shaft 122 and is disposed at substantially the same height as the crank pulley 115 and in front of the crank pulley 115.
The water pump pulley 118 is supported by the water pump pulley shaft 123 and is disposed between the crank pulley 115 and the air conditioning compressor pulley 116 and above the crank pulley 115 and the air conditioning compressor pulley 116.
The auxiliary pulley 120 is supported by the auxiliary pulley shaft 124 and is disposed above the crank pulley 115 and behind the vehicle.
The auxiliary machine 121 has a lower part supported by the engine body 106 by the fourth rear bolt 109D and an upper part supported by the engine body 106 by the seventh to eighth rear bolts 109G to 109H via the bracket 125. Has been.
Further, an idler pulley 126 is disposed in the engine body 106 between the crank pulley 115 and the auxiliary pulley 120 and above the crank pulley 115. The idler pulley 126 is supported by an idler pulley shaft 127.

The engine body 106 is provided with a drive device 128 for the auxiliary machine 121.
In this driving device 128, a belt 129 is wound around a crank pulley 115, an idler pulley 126, an auxiliary pulley 120, a water pump pulley 118, and an air conditioning compressor pulley 116. In this case, the belt 129 is disposed such that the inner surface is in contact with the crank pulley 115, the auxiliary pulley 120, the water pump pulley 118, and the air conditioning compressor pulley 116, and the outer surface (rear surface) is in contact with the idler pulley 126. The
As shown in FIGS. 6 and 8, the auxiliary pulley 120 to which the driving force is transmitted from the crank pulley 115 via the belt 129 is the side (rearward) from which the belt 129 is sent out from the crank pulley 115 in the running direction of the belt 129. Side).
In such an arrangement structure of each component, the engine main body 106 has a belt 129 travel line between the crank pulley 115 and the auxiliary pulley 120 by an idler pulley 126 arranged between the crank pulley 115 and the auxiliary pulley 120. A concave portion 130 that is curved inward from the tangent line T in contact with the belt 129 and is recessed inward is formed in the running line of the belt 129.
In this case, as shown in FIG. 8, the structure is such that the water from the lower part wound around the belt 129 hanging on the crank pulley 115 is likely to get on the auxiliary machine 121, or as a boss part of the cover 107, particularly as shown in FIG. As shown in FIG. 5, the second rear boss portion 112B located behind the crank pulley 115 is in a position lower than the end surface of the belt 129 (on the cylinder block 102 side). That is, the second rear boss 112B is formed on the recessed surface portion (sealing surface portion with the cylinder block 102) 107C of the cover 107, and is disposed at a height that does not reach the protruding surface portion 107A of the cover 107.

Japanese Utility Model Publication No. 2-7241

  In an auxiliary machine driving belt device for an internal combustion engine according to Patent Document 1, a shielding member that covers a space sandwiched between an idler pulley on the back surface (outer surface) of the belt and the idler pulley is attached to a rotating shaft of the idler pulley Structure.

  However, in the arrangement of the auxiliary machine of the internal combustion engine shown in FIGS. 6 and 7, as shown in FIGS. 6 and 8, water is likely to splash around the auxiliary machine 121 having a large load. Belt squealing is likely to occur, and when the auxiliary machine 121 is heavily splashed with water, it is likely to cause a failure, and further, there is no effect other than fixing each boss part of the cover 107 to the engine body 106, and an improvement. Was desired.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a drive device for an auxiliary machine that shields water from being applied to the auxiliary machine pulley and prevents belt slippage and squealing.

According to the present invention, a cover that is fastened by a plurality of bolts is disposed at an end of an engine body of an internal combustion engine, a crank pulley is attached to an end of a crankshaft that penetrates the cover and protrudes outward, and the crank pulley The auxiliary pulley to which the driving force is transmitted from the belt through the belt is arranged on the side where the belt is sent from the crank pulley in the running direction of the belt, and is arranged between the crank pulley and the auxiliary pulley. In the drive device for an auxiliary machine, in which a running line of the belt is curved inward with respect to a tangent line contacting the crank pulley and the auxiliary machine pulley by an idler pulley, and a recess recessed inward is formed in the running line of the belt . It said cover has a boss portion to which the bolt penetrates at a plurality of locations, placing at least one boss portion of the plurality of boss portions in the recess Both sets a boss portion disposed in the recess as a projecting boss portion projecting to a height to cover the width direction overall width of the crank pulley, the belt of the crank pulley the belt is wound section of the accessory pulley A tangent line that contacts the section around which the belt is wound is a first tangent line, and a tangent line that contacts the section where the belt of the crank pulley is wound and a section where the belt of the auxiliary pulley is not wound is a second tangent line. In this case, the protruding boss portion is disposed in a region surrounded by the first tangent and the second tangent, and an outer peripheral surface is in contact with at least one of the first tangent or the second tangent. The diameter is set so as to partition the crank pulley side and the auxiliary pulley side .

  According to the present invention, it is possible to shield water from being applied to the auxiliary pulley and prevent belt slippage and squealing.

FIG. 1 is a side view of the internal combustion engine from the right side. (Example) FIG. 2 is a perspective view of the drive device of FIG. (Example) FIG. 3 is a rear view of the driving device of FIG. (Example) FIG. 4 is a diagram showing the behavior of water in the driving device. (Example) FIG. 5A is a configuration diagram illustrating a case where the position of the protruding boss portion is changed. FIG. 5B is a configuration diagram showing a case where the diameter of the protruding boss portion is changed. (Modification) FIG. 6 is a side view from the right side of the internal combustion engine. (Conventional example) FIG. 7 is a perspective view of the drive device of FIG. (Conventional example) FIG. 8 is a diagram showing the behavior of water in the driving device. (Conventional example)

  The present invention provides a cover with a plurality of boss portions through which bolts penetrate, and covers at least one boss portion among the boss portions, for the purpose of shielding water from the auxiliary machine pulley and preventing belt slippage and squealing. In addition to being disposed in the recess, the boss portion disposed in the recess is set as a projecting boss portion projecting at a height that covers the entire width of the crank pulley in the width direction.

1 to 4 show an embodiment of the present invention.
1 to 3, reference numeral 1 denotes an internal combustion engine mounted horizontally on a vehicle, 2 a cylinder block, 3 a cylinder head, 4 a cylinder head cover, and 5 an oil pan. The cylinder block 2 and the cylinder head 3 constitute an engine body 6.
A cover (chain case) 7 is fastened to the engine body 6 at a predetermined position with a plurality of bolts at the right end. Specifically, the cover 7 includes first to fourth front bolts 8A to 8D arranged upward from the lower part at the front part, and a first part arranged upward from the lower part at the rear part. It is fastened to the right end portion of the engine body 6 by the eighth rear bolts 9A to 9H and further by the first to third central bolts 10A to 10C aligned in the front-rear direction at the center and at the top. The cover 7 includes first to fourth front bosses through which first to fourth front bolts 8A to 8D, first to eighth rear bolts 9A to 9H, and first to third central bolts 10A to 10C pass. 11A to 11D, first to eighth rear boss portions 12A to 12H and first to third central boss portions 13A to 13C are provided at predetermined positions.
A crankshaft 14 that is oriented in the vehicle width direction (left-right direction) and whose end portion 14A passes through the cover 7 and protrudes rightward and outward is pivotally supported at the central portion of the lower portion of the cylinder block 2. . A crank pulley 15 is attached to the protruding end portion 14A of the crankshaft 14. As shown in FIGS. 1 and 4, the crank pulley 15 rotates in the clockwise rotation direction R in a side view from the right side.

The engine body 6 is provided with an air conditioning compressor 17 provided with an air conditioning compressor pulley 16, a water pump 19 provided with a water pump pulley 18, and an auxiliary machine (alternator) 21 provided with an auxiliary machine pulley 20. .
The air-conditioning compressor pulley 16 is supported by the air-conditioning compressor pulley shaft 22, and is disposed at substantially the same height as the crank pulley 15 and in front of the crank pulley 15.
The water pump pulley 18 is supported by the water pump pulley shaft 23 and is disposed between the crank pulley 15 and the air conditioning compressor pulley 16 and above the crank pulley 15 and the air conditioning compressor pulley 16.
The auxiliary pulley 20 is supported by the auxiliary pulley shaft 24 and is disposed above the crank pulley 15 and behind the vehicle.
The auxiliary machine 21 has a lower part supported by the engine body 6 by the fourth rear bolt 9D and an upper part supported by the engine body 6 by the seventh to eighth rear bolts 9G to 9H via the bracket 25. Has been.
An idler pulley 26 is disposed in the engine body 6 between the crank pulley 15 and the auxiliary pulley 20 and above the crank pulley 15. The idler pulley 26 is supported by an idler pulley shaft 27.

The engine body 6 is provided with a drive device 28 for the auxiliary machine 21.
In this drive device 28, a belt 29 is wound around the crank pulley 15, the idler pulley 26, the auxiliary pulley 20, the water pump pulley 18, and the air conditioning compressor pulley 16. In this case, the belt 29 is disposed such that the inner surface is in contact with the crank pulley 15, the auxiliary pulley 20, the water pump pulley 18, and the air conditioning compressor pulley 16, and the outer surface (rear surface) is in contact with the idler pulley 26. The
As shown in FIGS. 1 and 4, the auxiliary pulley 20 to which the driving force is transmitted from the crank pulley 15 via the belt 29 is the side (rear side) where the belt 29 is sent from the crank pulley 15 in the traveling direction of the belt 29. Side).
In such an arrangement structure of each component, as shown in FIG. 4, the engine body 6 has a belt 29 running line at the right end portion by an idler pulley 26 arranged between the crank pulley 15 and the auxiliary pulley 20. Is recessed inwardly in the running line of the belt 29 by bending inwardly from a tangent line T that contacts the crank pulley 15 and the auxiliary pulley 20.

  As shown in FIGS. 1 to 4, in the cover 7, as the at least one boss portion among the plurality of boss portions, the second rear boss portion 12 </ b> B located on the lower side behind the crank pulley 15 is a recess. 30. Further, the second rear boss portion 12 </ b> B disposed in the recess 30 is set as a protruding boss portion 31 that protrudes rightward to a height H that covers the entire width W of the crank pulley 15. That is, the projecting boss portion 31 (second rear boss portion 12B) is located at a lower part of the engine body 6 and near the rear of the crank pulley 15 and obliquely rearward by the rotation of the belt 29 applied to the crank pulley 15. It is arranged in the direction in which the water splashed up to the auxiliary machine 21 side to fly is formed on the protruding surface portion 7 </ b> A of the cover 7. The protruding boss portion 31 protrudes rightward from the protruding surface portion 7A of the cover 7 at a height H so as to cover the entire width W of the crank pulley 15 in the width direction. The tip of the protruding boss 31 protrudes at least to the position of the right side surface of the crank pulley 15 and, for example, protrudes to the right by a distance L from the right side surface of the crank pulley 15 as shown in FIG. Further, in the cover 7, the projecting surface portion 7A is connected to the recessed surface portion (seal surface portion with the cylinder block 2) 7C via the step surface portion 7B.

Due to the above structure, as shown in FIGS. 1 and 4, the water from below that is splashed by the portion of the belt 29 on the crank pulley 15 is lowered by the protruding boss portion 31 (second rear boss portion 12B). This effectively blocks the splashed water from splashing toward the auxiliary pulley 20, thereby preventing the auxiliary pulley 20 from being exposed to water and preventing belt slippage and squealing caused by the exposure to water. be able to. In addition, since the protruding boss portion 31 protruding from the cover 7 has a function of shielding the auxiliary pulley 20 from being exposed to water, it is not necessary to install a separate wall-like structure for shielding on the cover 7 as a separate structure. It is possible to simplify and reduce the weight of the cover 7.
Further, the projecting boss portion 31 (second rear boss portion 12B) is disposed at a lower portion of the engine body 6 and blocks water splashed from the belt 29 hanging on the crank pulley 15 immediately after being splashed. Thereby, in order to block the water splashed up from the belt 29, the protruding boss portion 31 can be made small, and the increase in the weight of the cover 7 can be prevented by avoiding the enlargement of the protruding boss portion 31.

Further, as shown in FIGS. 1 and 4, the tangent line T contacting the section around which the belt 29 of the crank pulley 15 is wound and the section around which the belt 29 of the auxiliary pulley 20 is wound is defined as a first tangent T1 (T1 = T), and a tangent line that contacts a section where the belt 29 of the crank pulley 15 is wound and a section where the belt 29 of the auxiliary pulley 20 is not wound is defined as a second tangent T2. In this case, the protruding boss portion (second rear boss portion 12B) 31 is disposed in a region M (water hoisting line) surrounded by the first tangent line T1 and the second tangent line T2, and the outer peripheral surface is the first. The diameter is set such that the region M is in contact with at least one of the tangent line T1 and the second tangent line T2 and is partitioned into a crank pulley 15 side and an auxiliary machine pulley 20 side at a predetermined position. That is, the protruding boss portion 31 is formed in a circular shape, and is arranged in a direction in which the axial direction intersects the first tangent line T1 and the second tangent line T2.
A region M (water hoisting line) surrounded by the first tangent line T1 and the second tangent line T2 has the same width as the full width (W) in the width direction of the belt 29 as shown in FIGS. The pulley 15 is formed from the portion around which the belt 29 is wound toward the auxiliary pulley 20 side in a divergent shape. The predetermined position where the region M is partitioned is changed to the crank pulley 15 side or the auxiliary pulley 20 side depending on the position, size, shape, etc. of the protruding boss portion 31.

Specifically, for example, as shown in FIG. 4, the protruding boss portion 31 is disposed in a region M (water hoisting line) surrounded by the first tangent line T1 and the second tangent line T2 and has one radial direction. The outer peripheral surface on the side is in contact with the first tangent line T1 and the outer peripheral surface on the other side in the radial direction is in contact with the second tangent line T2 so that the region M is divided into the crank pulley 15 side and the auxiliary pulley 20 side. D1 is set.
As a modified example, as shown in FIG. 5A, the protruding boss 31 has a radial direction within a region M (water hoisting line) surrounded by the first tangent line T1 and the second tangent line T2. The outer peripheral surface on the side is in contact with the first tangent line T1, and the outer peripheral surface on the other side in the radial direction crosses the second tangent line T2 beyond the second tangent line T2 by a distance L1, thereby complementing the region M with the crank pulley 15 side. It is arranged at a position lower than the position in FIG. 4 and closer to the crank pulley 15 side so as to partition with the machine pulley 20 side, and is set to the same diameter D1 as the diameter D1 in FIG.
Furthermore, as another modified example, as shown in FIG. 5 (B), the protruding boss portion 31 has a radial direction within a region M (water hoisting line) surrounded by the first tangent line T1 and the second tangent line T2. The outer peripheral surface on one side is in contact with the first tangent line T1, and the outer peripheral surface on the other radial side crosses the second tangent line T2 beyond the second tangent line T2 by a distance L2, and the region M is on the crank pulley 15 side. Is set to a diameter D2 larger than the diameter D1 in FIGS. 4 and 5A, and is arranged at the same position as the position in FIG.

  As described above, by changing and setting the position of the protruding boss portion 31 (second rear boss portion 12B), the size of the diameter, and the like, from below the belt hopped on the portion of the belt 29 hanging on the crank pulley 15 The water is repelled downward by the projecting boss portion 31 to effectively shield the splashed water from heading toward the auxiliary pulley 20, thereby suppressing the wetness of the auxiliary pulley 20. It is possible to prevent belt slippage and squealing that occur.

  In the present invention, one or more boss portions of the plurality of boss portions are arranged in the recesses and set as projecting boss portions, and the water from below that is splashed by the belt portion hanging on the crank pulley is 1 It is also possible to efficiently shut off with two or more boss portions.

  The auxiliary device drive device according to the present invention can be applied to various vehicles.

1 Internal combustion engine 2 Cylinder block 3 Cylinder head 4 Cylinder head cover 5 Oil pan 6 Engine body 7 Cover (chain case)
8A to 8D First to fourth front bolts 9A to 9H First to eighth rear bolts 10A to 10C First to third central bolts 11A to 11D First to fourth front bosses 12A to 12H First to fourth 8 Rear boss 13A to 13C 1st to 3rd center boss 14 Crankshaft 14A End of crankshaft 15 Crank pulley 16 Air conditioning compressor pulley 17 Air conditioning compressor 18 Water pump pulley 19 Water pump 20 Auxiliary pulley 21 Auxiliary machine (alternator)
22 Air Conditioning Compressor Pulley Shaft 23 Water Pump Pulley Shaft 24 Auxiliary Pulley Shaft 25 Bracket 26 Idler Pulley 27 Idler Pulley Shaft 28 Drive Device 29 Belt 30 Recess 31 Projecting Boss (Second Rear Boss 12B)
T1 First tangent T2 Second tangent M Area surrounded by first tangent and second tangent (water hoisting line)

Claims (1)

A cover that is fastened by a plurality of bolts is disposed at the end of the engine body of the internal combustion engine, a crank pulley is attached to the end of the crankshaft that penetrates the cover and protrudes outward, and is connected to the crank pulley through a belt. The auxiliary pulley to which the driving force is transmitted is arranged on the side from which the belt is sent out from the crank pulley in the running direction of the belt, and the idler pulley arranged between the crank pulley and the auxiliary pulley In the accessory driving apparatus, a belt traveling line is curved inward with respect to a tangent line contacting the crank pulley and the auxiliary pulley, and a recess recessed inward is formed in the belt traveling line. Is provided in a plurality of locations, and at least one boss portion among the plurality of boss portions is disposed in the recess and the Set the boss portion disposed portion as projecting boss portion projecting to a height to cover the width direction overall width of the crank pulley, the belt of the crank pulley the belt is wound section of said auxiliary pulley is wound When the tangent line that is in contact with the section is the first tangent line, and the tangent line that is in contact with the section where the belt of the crank pulley is wound and the section where the belt of the auxiliary pulley is not wound is the second tangent line, The protruding boss is disposed in a region surrounded by the first tangent and the second tangent, and an outer peripheral surface is in contact with at least one of the first tangent or the second tangent and the region is defined as the crank pulley. A drive device for an auxiliary machine, characterized in that the diameter is set so as to be divided into a side and an auxiliary machine pulley side .

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