JP4446836B2 - Auxiliary equipment arrangement structure in internal combustion engine for vehicle - Google Patents

Description

According to the present invention, a cooling jacket is provided in a cylinder component comprising a cylinder block having a cylinder bore and coupled to a crankcase and a cylinder head coupled to the cylinder block, and the crankshaft is rotatable in the crankcase. The present invention relates to an internal combustion engine for a vehicle in which an oil pump that is supported and driven by the crankshaft is housed, and particularly relates to an improvement in the arrangement structure of auxiliary equipment such as a water pump and an oil cooler.

Patent Document 1 discloses that a water-cooled oil cooler is disposed on a front surface of a crankcase in an internal combustion engine mounted on a vehicle in order to effectively apply traveling wind.
Japanese Utility Model Publication No. 6-43449

  However, in the internal combustion engine disclosed in Patent Document 1, a water pump is provided in the crankcase at a position adjacent to the oil cooler. This complicates the layout of the cooling water passage and the oil passage to the cylinder component side. In particular, a small internal combustion engine having a small number of cylinders not only makes the layout more difficult, but also interferes with the water pump. It is difficult to increase the size of the cooler.

The present invention has been made in view of such circumstances, and facilitates the layout of the cooling water passage and the oil passage in the cylinder component, and enables the enlargement of the oil cooler, and the auxiliary device arrangement in the vehicle internal combustion engine The purpose is to provide a structure.

In order to achieve the above object, a first aspect of the present invention provides a cylinder block coupled to a crankcase having a cylinder bore inclined forward so that a cylinder axis is substantially horizontal, and coupled to the cylinder block . A cooling jacket is provided in a cylinder component portion including a cylinder head, and one side of the crankcase, the cylinder block, and the cylinder head in the vehicle width direction extends in parallel with the cylinder axis and is provided inside. A chain passage through which a timing chain passes is provided, and a crankshaft extending in the vehicle width direction is rotatably supported in the crankcase and an oil pump driven by the crankshaft is housed in a lower side surface of the cylinder head. The exhaust pipe to be connected is connected along the lower side surface of the cylinder block. In accessory arrangement structure in a vehicle internal combustion engine comprising extended downward of the case, the water pump is on the same side as the chain path in the vehicle width direction with respect to the cylinder axis, to the side surface of the cylinder structure portion An oil cooler provided above the exhaust pipe and for cooling oil from the oil pump with cooling water from the water pump is opposite to the chain passage in the vehicle width direction with respect to the cylinder axis. side, characterized in that it is provided on the side surface of the cylinder block.

According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the water pump is provided in the cylinder head, the oil cooler is provided in the cylinder block, and the crank is passed from the oil pump through the oil cooler. An oil passage returning to the case is provided in the crankcase and the cylinder block so as to communicate with each other at a coupling surface of the crankcase and the cylinder block.

According to a third aspect of the invention, in addition to the configuration of the first or second aspect of the invention, the water pump is connected to the cooling jacket and the oil cooler via a joint attached to a side surface of the cylinder block. It is characterized by that.

In addition to the configuration of the invention of claim 2 or 3 , the invention of claim 4 is characterized in that a thermostat for controlling the flow rate of cooling water flowing through the cooling jacket and the oil cooler is provided on the oil cooler side of the cylinder head. It is provided on the side surface.

According to the first aspect of the present invention, since the oil cooler and the water pump are disposed on the opposite sides of the cylinder axis in the vehicle width direction , the layout of the oil passage leading to the oil cooler at the cylinder component portion is achieved. This makes it easy to avoid the influence of the arrangement of the cooling water passage leading to the cooling jacket of the cylinder component, and allows the oil cooler to be enlarged while avoiding interference with the water pump.

Moreover, an exhaust pipe connected to the lower side of the cylinder head, in a vehicle comprising extended downward of the crankcase along the bottom side of the cylinder block, while suppressing the overall height of the internal combustion engine, also in the exhaust pipe The ground clearance can be ensured while suppressing the overhang from the cylinder component, and the arrangement of auxiliary machines and piping can be facilitated.

According to the second aspect of the present invention, it is easy to form an oil passage between the cylinder block in which the oil cooler is provided and the crankcase in which the oil pump is accommodated.

According to the third aspect of the present invention, space for passage arrangement for guiding the cooling water is reduced, and passage positioning is facilitated by the joint.

Furthermore, according to the fourth aspect of the invention, the pipe line connecting the oil cooler and the thermostat can be shortened.

  Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

  1 to 5 show one embodiment of the present invention, FIG. 1 is a side view of a vehicle equipped with the internal combustion engine of the present invention, and FIG. 2 is a part of the internal combustion engine viewed from the same direction as FIG. FIG. 3 is a cross-sectional side view taken along line 2-2 in FIG. 3, FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2, FIG. 4 is a view taken in the direction of arrow 4 in FIG. FIG.

  First, in FIG. 1, this vehicle is a small four-wheeled vehicle having a pair of left and right front wheels WF ... and a pair of left and right rear wheels WR ..., and is steered with a bar handle 11 for steering the front wheels WF ... A mechanism 12 is provided at the front portion of the vehicle body frame 13. Further, a front seat 14 is provided at the center in the front-rear direction of the vehicle body frame 13, and a rear seat 15 disposed behind the front seat 14 is provided at the rear of the vehicle body frame 13. Below the rear seat 15, an engine body 16 of a single-cylinder internal combustion engine E is swingably supported on the body frame 13, and rear wheels WR that are driven to rotate by the output of the internal combustion engine E are connected to the engine body 16. A cushion unit 17 is provided between the vehicle body frame 15 and the engine body 16.

  The front part of the vehicle body frame 13 is covered with a front cover 20, and a lower cover 22 that covers a middle part in the front-rear direction of the vehicle body frame 13 and forms a floor 21 is connected to the rear end lower part of the front cover 20. A rear cover 23 that covers the rear portion of the vehicle body frame 13 and the internal combustion engine E is connected to the rear portion of the lower cover 22.

  A pair of left and right front pillars 24 are connected to both sides of the upper portion of the front cover 20 so as to extend rearward, and the upper portion of the front pillars 24 and the rear cover 23 are inclined rearward. A pair of left and right roof side pillars 25 bent so as to bulge upward are provided. A cross member 26 is installed between the upper portions of the front pillars 24.

  A wind screen 27 is provided at a portion defined by the front cover 20, the both front pillars 24, and the cross member 26, and the front and rear seats 24 are disposed from the middle portion to the front side of the roof side pillars 25. , 25 from above is provided.

  2 to 5, the engine body 16 includes a crankcase 31, a cylinder block 32 having a cylinder bore 34 and coupled to the crankcase 31, and a cylinder component 30 together with the cylinder block 32. A cylinder head 33 coupled to the cylinder block 32 is provided. The cylinder component 30 inclines the cylinder axis C, that is, the axis of the cylinder bore 34 slightly upwards until it becomes substantially horizontal. Combined.

  A piston 35 is slidably fitted to the cylinder bore 34, and the piston 35 is connected to a crankshaft 36 rotatably supported by the crankcase 31 via a connecting rod 37 and a crankpin 38. .

  A combustion chamber 40 that faces the top of the piston 35 is formed between the cylinder block 32 and the cylinder head 33 of the cylinder component 30. The cylinder block 32 and the cylinder head 33 are surrounded by the cylinder bore 34 and the combustion chamber 40. Is provided with a cooling jacket 41 for circulating cooling water. A spark plug 42 facing the combustion chamber 40 is attached to the cylinder head 33.

  The cylinder head 33 is provided with an intake port 43 that opens to the upper side wall and an exhaust port 44 that opens to the lower side wall, as well as an intake valve 45 that switches communication between the intake port 43 and the combustion chamber 40, and an exhaust port. An exhaust valve 46 that switches between communication and blocking of the port 44 to and from the combustion chamber 40 is disposed so as to be able to open and close, and constitutes a part of a valve mechanism 49 that opens and closes the intake valve 45 and the exhaust valve 46. The camshaft 50 is rotatably supported on the cylinder head 33.

  A carburetor 47 is connected to the upper side wall of the cylinder head 33 so as to be continuous with the intake port 43, and an exhaust pipe 48 connected to the exhaust port 44 is connected to a lower side surface of the cylinder head 33. The lower end of the cylinder block 32 is extended below the crankcase 31.

  Incidentally, the crankcase 31, the cylinder block 32, and the cylinder head 33 are provided with a chain passage 51 extending in parallel with the axis of the cylinder bore 34, and one end portion of the camshaft 50 is disposed so as to face the chain passage 51. The

  Thus, a driven sprocket 52 is fixed to one end portion of the camshaft 50, and travels in the chain passage 51 by the drive sprocket 53 (see FIG. 4) provided on the crankshaft 36 and the driven sprocket 52. An endless timing chain 54 is wound. As a result, the rotational power is transmitted from the crankshaft 36 to the camshaft 50 at a reduction ratio of 1/2.

  An oil pump 56 that draws up oil from an oil strainer 55 disposed in the lower portion of the crankcase 31 is housed in the crankcase 31 so as to rotate with the power transmitted from the crankshaft 36. A relief valve 57 is interposed between the discharge port 56a and the suction port 56b of the oil pump 56.

  The cylinder component 30 includes an oil cooler 60 through which oil from the oil pump 56 is guided, and a water pump 61 that circulates cooling water through the cooling jacket 41 and supplies cooling water to the oil cooler 60. The crankshaft 36 is provided so as to be disposed on the opposite sides in the axial direction.

  The cylinder head 33 is provided with an opening 62 that faces one end of the camshaft 50, and the pump housing 63 of the water pump 61 is fastened to the cylinder head 33 so as to close the opening 62. The housing main body 64 and a pump cover 65 fastened to the housing main body 64 so as to form a pump chamber 66 between the housing main body 64 and the housing main body 64.

  A pump shaft 67 coaxially connected to one end of the camshaft 50 rotatably penetrates the housing main body 64 so that one end of the camshaft 50 protrudes into the pump chamber 66, and a ball bearing is provided between the housing main body 64 and the pump shaft 67. 68 and a seal member 69 are interposed, and an impeller 70 is fixed to the end of the pump shaft 67 in the pump chamber 66.

  On the other hand, on the side surface of the cylinder block 32 opposite to the water pump 61, as clearly shown in FIG. 2, a circular mounting surface in which a cylindrical connecting tube portion 72 that forms an oil passage 71 is disposed at the center. 73 is provided.

  The oil cooler 60 is configured such that a heat exchanger 75 is accommodated in a cooler housing 74, and the cooler housing 74 closes an opening of the cover 76 and a bowl-shaped cover 76 that covers the heat exchanger. A disc-shaped lid plate 77 that is liquid-tightly attached to the mounting surface 73, and a distribution plate 78 that is sandwiched between the heat exchanger 75 and the lid plate 77. Thus, an annular oil chamber 79 surrounding the connecting cylinder portion 72 is formed between the cover plate 77 attached to the attachment surface 73 and the cylinder block 32, and the oil chamber 79 is provided in the cover plate 77 and the distribution plate 78. An inlet side oil passage 80 that guides the oil to the heat exchanger 75 side and an outlet side oil passage 81 that guides the oil from the heat exchanger 75 to the oil passage 71 are provided.

  An oil passage 82 provided in the crankcase 31 so as to guide oil from the discharge port 56 a of the oil pump 56 and an oil passage 83 provided in the cylinder block 32 so as to communicate with the oil chamber 79 are provided in the crankcase 31. The cylinder case 32 communicates with the coupling surface of the cylinder block 32, communicates with the oil passage 71 of the oil cooler 60 and is provided in the cylinder block 32, and returns the oil into the crankcase 31. Are connected to each other at the joint surface of the crankcase 31 and the cylinder block 32.

  That is, the oil passages 82, 83; 84, 85 returning from the oil pump 56 through the oil cooler 60 to the crankcase 31 communicate with each other at the coupling surface of the crankcase 31 and the cylinder block 32. 32.

  By the way, a joint 89 having a water passage 88 communicating with the lowermost part of the cooling jacket 41 in the cylinder component 30 is attached to the lower side surface of the cylinder block 32 by a plurality of bolts 90. It is possible to discharge water from the cooling jacket 41 by removing it.

  On the other hand, the pump cover 65 in the water pump 61 is provided with a suction side connection pipe 91 and a discharge side connection pipe 92, and the suction side connection pipe 91 is connected to a radiator (not shown). It is connected to the joint 89 via a water guiding hose 93. The cover 76 of the cooler housing 74 in the oil cooler 60 is provided with an introduction side connection pipe 94 and a lead-out side connection pipe 95 that communicate with the heat exchanger 75, and the joint 89 is connected to the introduction side through a water conduit hose 96. Connected to the connecting pipe 94. That is, the cooling water from the water pump 61 flows separately into the cooling jacket 41 and the oil cooler 60 at the joint 89.

  A thermostat 98 is provided on the side surface of the cylinder head 33 on the oil cooler 60 side, and a water passage 99 leading to the uppermost portion of the cooling jacket 41 is provided in the cylinder head 33 so as to be connected to the thermostat 98. The other end of the water guiding hose 97 whose one end is connected to the outlet side connecting pipe 95 is connected to the thermostat 98.

  The thermostat 98 controls the circulation amount of the cooling water flowing through the cooling jacket 41 and the oil cooler 60 according to the temperature of the cooling water. The cooling water derived from the cooling jacket 41 and the oil cooler 60 is introduced from the thermostat 98. It is guided to the radiator via the hose 100.

  Next, the operation of this embodiment will be described. The cooling jacket 41 is provided in the cylinder component portion 30 including the cylinder block 32 and the cylinder head 33, the oil pump 56 is accommodated in the crankcase 31, and the cooling jacket 41 contains cooling water. A water pump 61 that circulates the oil and an oil cooler 60 that cools oil from the oil pump 56 with cooling water from the water pump 61 are arranged on opposite sides in the axial direction of the crankshaft 36 to form a cylinder. Since it is provided in the portion 30, the layout of the oil passage leading to the oil cooler 60 in the cylinder constituent portion 30 is easy to be affected by the disposition of the cooling water passage leading to the cooling jacket 41 of the cylinder constituent portion 30, and The oil cooler 60 is enlarged to avoid interference with the water pump 61. Door can be.

  The cylinder block 32 has a cylinder axis C inclined so as to be substantially horizontal, and is coupled to the crankcase 31. An exhaust pipe 48 connected to the lower side surface of the cylinder head 33 is connected to the lower side surface of the cylinder block 32. Therefore, the ground height can be secured while the overhang of the exhaust pipe 48 from the cylinder component 30 is suppressed while the overall height of the internal combustion engine E is kept low. Machine arrangement and piping can be facilitated.

  Moreover, a water pump 61 is provided in the cylinder head 33, an oil cooler 60 is provided in the cylinder block 32, and oil passages 82, 83; 84, 85 returning from the oil pump 56 to the crankcase 31 through the oil cooler 60 are provided in the crankcase. 31 and the cylinder block 32 are provided in the crankcase 31 and the cylinder block 32 so as to communicate with each other at the coupling surface between the cylinder block 32 and the cylinder block 32. It is easy to form an oil passage between them.

  In addition, a joint 89 is attached to the lower side surface of the cylinder block 32, and the water pump 61 is connected to the cooling jacket 41 and the oil cooler 60 via the joint 89, thereby reducing the space for passage arrangement for guiding the cooling water. The passage 89 can be easily positioned by the joint 89.

  Further, since a thermostat 98 for controlling the circulation amount of the cooling water flowing through the cooling jacket 41 and the oil cooler 60 is provided on the side surface of the cylinder head 33 on the oil cooler 60 side, the water guiding hose 97 for guiding the cooling water from the oil cooler 60 to the thermostat 98 is provided. Can be shortened.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

It is a side view of the vehicle carrying the internal combustion engine of this invention. FIG. 4 is a partially cutaway side view of the internal combustion engine viewed from the same direction as FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a view taken in the direction of arrow 4 in FIG. 3. FIG. 5 is a view taken in the direction of arrow 5 in FIG. 4.

30 ... Cylinder component 31 ... Crank case 32 ... Cylinder block 33 ... Cylinder head 34 ... Cylinder bore 36 ... Crank shaft 41 ... Cooling jacket 48 ... Exhaust pipe
51 ... Chain passage
54 ... Timing chain 56 ... Oil pump 61 ... Water pump 60 ... Oil cooler 82, 83, 84, 85 ... Oil passage 89 ... Joint 98 ... Thermostat C ...・ Cylinder axis E ... Internal combustion engine

Claims (4)

Cylinder coupled to the cylinder axis (C) approximately cylinder block connected to the crankcase (31) having a cylinder bore (34) which is inclined forward such that the horizontal (32), and said cylinder block (32) A cooling jacket (41) is provided in a cylinder component (30) comprising the head (33), and one side of the crankcase (31), the cylinder block (32) and the cylinder head (33) in the vehicle width direction. Is provided with a chain passage (51) extending in parallel with the cylinder axis (C) and through which the timing chain (54) passes, and the crankcase (31) has a crank extending in the vehicle width direction. an oil pump shaft (36) is driven by said crankshaft while being rotatably supported (36) (56) is housed, prior to In an internal combustion engine for a vehicle, an exhaust pipe (48) connected to the lower side surface of the cylinder head (33) extends below the crankcase (31) along the lower side surface of the cylinder block (32) . In the auxiliary equipment arrangement structure ,
The water pump (61) is provided on a side surface of the cylinder component (30) on the same side as the chain passage (51) in the vehicle width direction with respect to the cylinder axis (C),
An oil cooler (60), which is located above the exhaust pipe (48) and cools oil from the oil pump (56) with cooling water from the water pump (61), is provided in the cylinder axis (C). wherein the chain path (51) opposite, and which are located on a side surface of the cylinder block (32), auxiliary placement structure in an internal combustion engine for a vehicle in the vehicle width direction with respect. The water pump (61) is provided in the cylinder head (33), the oil cooler (60) is provided in the cylinder block (32), the oil pump (56) passes through the oil cooler (60), and the crankcase ( The crankcase (31) and the cylinder block (32) so that the oil passages (82, 83, 84, 85) returning to 31) communicate with each other at the connecting surface of the crankcase (31) and the cylinder block (32). The auxiliary equipment arrangement structure in the internal combustion engine for a vehicle according to claim 1, wherein The water pump (61) is connected to the cooling jacket (41) and the oil cooler (60) via a joint (89) attached to a side surface of the cylinder block (32). Or the auxiliary equipment arrangement structure in the internal combustion engine for vehicles of 2 . A thermostat (98) for controlling a flow rate of cooling water flowing through the cooling jacket (41) and the oil cooler (60) is provided on a side surface of the cylinder head (33) on the oil cooler (60) side. The auxiliary machine arrangement structure in the internal combustion engine for vehicles according to claim 2 or 3 .

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