JP2013155661A - Vehicle power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact vehicle power unit in which a space for routing an exhaust pipe can be reduced while avoiding thermal damages on a torque converter by the exhaust pipe.SOLUTION: A vehicle power unit includes: an engine E having a crank case 10 for supporting a crankshaft 25 disposed along a front-rear direction of the vehicle and a cylinder block 11 disposed to stand on an upper surface of the crank case, in which an exhaust pipe 22 connected to a cylinder head 12 in an upper part of the cylinder block extends once forward the cylinder head, then returns to extend rearward after passing over one side of the cylinder block 11. A torque converter 31 is connected to a rear end of the crankshaft 25; and an oil cooler 53 for cooling oil supplied from an oil pump 48, 49 to each part of the power unit P is mounted on a rear case cover 29 joined to a rear end face of the crank case 10 to cover the torque converter 31.

Description

  The present invention is connected to a crankcase for supporting a crankshaft disposed along the longitudinal direction of a vehicle, an engine including a cylinder block standing on the upper surface of the crankcase, and one end of the crankshaft. A torque converter, and a transmission housed in the crankcase having a main shaft that is arranged in parallel to the crankshaft and connected to the output side of the torque converter. The present invention relates to an improvement in a vehicle power unit in which a connected exhaust pipe extends to the front of the cylinder head and then U-turns to extend rearward through one side of the cylinder block.

  Such a vehicle power unit is already known as described in Patent Document 1.

JP 2004-36509 A

  By the way, in the conventional vehicle power unit, after the exhaust pipe connected to the cylinder head at the upper part of the cylinder block extends forward and downward of the cylinder block, it makes a U-turn and moves backward through one side of the cylinder block. On the other hand, since the torque converter is attached to the front end of the crankshaft, when extending the exhaust pipe to the front and the bottom of the cylinder, it is necessary to extend it largely forward to avoid heat damage to the torque converter. Therefore, it was necessary to secure a wide space for the exhaust pipe, which was one of the factors that hindered the compactness of the power unit.

  The present invention has been made in view of such circumstances, and provides a compact vehicle power unit that can avoid heat damage to the torque converter of the exhaust pipe and can reduce the space for handling the exhaust pipe. The purpose is to do.

  In order to achieve the above object, the present invention provides a crankcase for supporting a crankshaft disposed along the longitudinal direction of a vehicle, an engine including a cylinder block standing on the upper surface of the crankcase, and the crank A torque converter coupled to one end of the shaft, and a transmission housed in the crankcase having a main shaft disposed in parallel with the crankshaft and coupled to the output side of the torque converter, In the vehicle power unit in which the exhaust pipe connected to the cylinder head at the upper part of the cylinder block extends to the front of the cylinder head and then makes a U-turn to extend rearward through one side of the cylinder block. Connect a converter to the rear end of the crankshaft, The engagement being in the rear case cover which covers the torque converter, the first characterized in that attached oil processing equipment for processing the discharge oil of the oil pump driven from the crankshaft. The oil pump corresponds to first and second oil pumps 48 and 49 in the embodiment of the present invention described later, and the oil processing device corresponds to an oil filter 52 and an oil cooler 53.

  According to the present invention, in addition to the first feature, as the oil processing device, an oil cooler for cooling the oil discharged from the oil pump is disposed so as to protrude from the upper surface of the rear case cover along the cylinder block. This is the second feature.

  Furthermore, in addition to the first or second feature, the present invention provides the oil processing apparatus, wherein the oil is discharged from the oil pump and disposed between the torque converter and the oil cooler on the side surface of the rear case cover. A third feature is that the oil filter is attached.

  Furthermore, in addition to the third feature of the present invention, the oil filter is disposed on the opposite side of the exhaust pipe across a plane including the axis of the crankshaft and the cylinder axis of the cylinder block. Features.

  In addition to the fourth feature of the present invention, a balancer shaft that is driven by the crankshaft to reduce engine vibration is disposed on the opposite side of the exhaust pipe across the plane. A fifth feature is that the oil pump is connected to the rear end.

  Furthermore, the present invention is characterized in that, in addition to the first to fifth features, the oil pump is attached to a rear end wall of the crankcase covered with the rear case cover.

  In addition to the first feature of the present invention, the transmission is arranged on one side of the left and right sides of the crankshaft, the upper surfaces of the crankcase and the rear case cover corresponding to the transmission, the cylinder block An exhaust pipe is disposed in a space surrounded by one side surface of the rear case cover, and an oil cooler as the oil processing device is provided on the upper surface of the rear case cover that is out of the space to cool oil discharged from the oil pump. According to a seventh feature of the present invention, an oil filter as the oil processing device for filtering the oil discharged from the oil pump is attached to a side surface of the case cover on the other side of the cylinder block.

  According to the first feature of the present invention, the torque converter is connected to the rear end of the crankshaft, and the oil cooler is attached to the rear case cover that is joined to the rear end surface of the crankcase and covers the torque converter. A sufficient distance is secured between the front U-turn portion of the pipe, which is particularly hot, and the torque converter and the oil cooler, so that the torque converter and the oil cooler can be prevented from being damaged by heat from the exhaust pipe. As a result, the U-turn part at the front of the exhaust pipe can be brought close to the front surface of the cylinder head, so that the exhaust pipe can be easily routed around the cylinder block and cylinder head, and the size of the power unit can be increased by the exhaust pipe. Can be avoided.

  According to the second feature of the present invention, the oil cooler is disposed so as to protrude along the cylinder block from the upper surface of the rear case cover, so that the dead space above the rear case cover can be installed in the oil cooler. Effectively, the oil cooler can be protected from contact with other objects by the cylinder block and the rear case cover while avoiding the enlargement of the power unit due to the oil cooler.

  According to the third aspect of the present invention, the oil filter disposed between the torque converter and the oil cooler is attached to the side surface of the rear case cover, so that the dead space between the torque converter and the oil cooler is installed in the oil filter. It can be effectively used to prevent the power unit from becoming large due to the oil filter.

  According to the fourth aspect of the present invention, the oil filter is disposed on the opposite side of the exhaust pipe across the plane including the axis of the crankshaft and the cylinder axis of the cylinder block, so that the exhaust pipe is not obstructed. , The oil filter can be easily maintained.

  According to the fifth aspect of the present invention, a balancer shaft driven by a crankshaft is disposed on the opposite side of the exhaust pipe across the plane, and an oil pump is connected to the rear end portion of the balancer shaft. Both the oil pump and the oil filter are placed on the opposite side of the exhaust pipe across the plane, avoiding heat damage to the exhaust pipe and shortening the oil flow path between the oil pump and the oil filter. Can be achieved.

  According to the sixth aspect of the present invention, the oil pump is attached to the rear end wall of the crankcase that is covered with the rear case cover, so that the oil pump is an oil processing device that is attached to the rear case cover, that is, an oil filter. In addition, the oil flow path between the oil cooler and the oil cooler can be shortened.

  According to a seventh aspect of the present invention, the transmission is disposed on one side of the crankshaft, the upper surface of the crankcase and the rear case cover corresponding to the transmission, one side surface of the cylinder block, By arranging the exhaust pipe in the space surrounded by the exhaust pipe, the exhaust pipe can be freely used by utilizing a relatively wide space formed by the upper surface of the crankcase and rear case cover corresponding to the transmission and one side surface of the cylinder block. Therefore, it is possible to easily avoid interference with other exhaust pipes, so that the degree of freedom in exhaust pipe layout is improved. In addition, an oil cooler that cools the oil discharged from the oil pump is provided on the upper surface of the rear case cover that is out of the space, and an oil filter that filters the oil discharged from the oil pump on the other side of the cylinder block of the rear case cover. By attaching each, it is possible to secure a sufficient distance between the exhaust pipe and each of the oil cooler and the oil filter and prevent heat damage to the oil cooler and the oil filter of the exhaust pipe.

The left view of the saddle-ride type four-wheel buggy vehicle which concerns on embodiment of this invention. FIG. 2 is an enlarged left side view of a power unit and a surrounding body frame in FIG. 1. The enlarged right side view. The enlarged plan view. The expanded rear view of the said power unit. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 5. The oil path figure in the said power unit.

  Hereinafter, an embodiment in which the present invention is applied to a saddle-ride type four-wheel buggy will be described with reference to the accompanying drawings. In the following description, front, rear, left and right are based on a saddle-ride type four-wheel buggy.

  1 to 4, a body frame F of a saddle-ride type four-wheel buggy B includes a pair of left and right frames formed by connecting an upper side bone 2, a lower side bone 3, a front side bone 4 and a rear side bone 5 into a quadrilateral shape. The main frames 1L and 1R, a plurality of cross members 6 and 6 that integrally connect the main frames 1L and 1R, and the rear portions of the upper side bones 2 and 2 of the main frames 1L and 1R are connected and extended backward. A pair of left and right front wheels Wf, Wf and rear wheels Wr, Wr are suspended from the front and rear portions of the left and right main frames 1L, 1R, respectively. A power unit P for driving the front wheels Wf, Wf and the rear wheels Wr, Wr is mounted on the main frames 1L, 1R so as to be surrounded by the main frames 1L, 1R. A steering handle 8 and a fuel tank 9 are disposed in order from the main frame 1L, 1R to the seat rail 7, and a straddle-type seat 21 is disposed on the upper portion thereof. An output shaft 43 (described later) of the power unit P is connected to a front propeller shaft 32 that drives the front wheels Wf and Wf and a rear plunger shaft 33 that drives the rear wheels Wr and Wr.

  As shown in FIG. 5, the power unit P includes a single-cylinder water-cooled engine E and a transmission M built in the crankcase 10 of the engine E. The cylinder block 11 that is coupled to and rises from the upper surface of the crankcase 10 is disposed slightly inclined to the left and right sides, and the cylinder head 12 joined to the upper end surface corresponds to each pair of intake and exhaust valves. A bifurcated intake port 13 and an exhaust port 14 (see FIG. 4) are opened on one side and the other side in the left-right direction.

  2 to 4 again, an intake pipe 15, a throttle body 16, an air duct 17, and an air cleaner 18 are sequentially connected to the intake port 13. At that time, the throttle body 16 is arranged in front of the cylinder head 12 in an oblique posture such that the intake passage 16a opened and closed by the throttle valve 19 approaches the cylinder head 12 toward the downstream side, and the intake pipe 15 is connected to the intake pipe 15 described above. It is bent in a U shape so as to connect the downstream end of the passage 16a and the intake port 13. The air duct 17 bends and extends upward from the upstream end of the intake passage 16a, and an air cleaner 18 disposed so as to straddle between the left and right main frames 1L and 1R is connected to the upstream end. . A connection port 18 a (see FIG. 4) of the air cleaner 18 to the air duct 17 is disposed offset e from the center of the air cleaner 18 in the left-right direction and opposite to the intake port 13.

  As shown in FIG. 3, an electromagnetic fuel injection valve 20 capable of injecting fuel toward the intake port 13 is mounted on the upper peripheral wall of the intake pipe 15. The upper side bone 2 of the main frame 1 </ b> R is formed in a mountain shape in which the vicinity immediately above the fuel injection valve 20 is the top.

  As shown in FIGS. 2 and 4, an exhaust pipe 22 is connected to the exhaust port 14 opened on the other side of the cylinder head 12. The exhaust pipe 22 extends from the exhaust port 14 to the front side of the cylinder head 12 below the intake pipe 15 and then bends downward to form a U-shape. As close to the top surface, linearly extends rearward inside the main frame 1L on the same side, and bends in a crank shape so as to bypass the rear frame 5 of the main frame 1L and extends rearward It is formed. A muffler 23 disposed behind the power unit P and adjacent to the inside of one rear wheel Wr is connected to the rear end of the exhaust pipe 22.

  Below the power unit P, a pair of left and right steps 24 and 24 projecting outward are attached to the lower bones 3 and 3 of the left and right main frames 1L and 1R.

  5 and 6, the power unit P is disposed such that the crankshaft 25 supported by the crankcase 10 of the engine E is substantially horizontal in the front-rear direction. A front case cover 26 is coupled to the front end surface of the crankcase 10 so as to form a power generation chamber 27 with the crankcase 10, and a rotor 28 a of a generator 28 accommodated in the power generation chamber 27 includes a crankshaft. The stator 28b of the generator 28 is fixed to the front case cover 26 so as to be surrounded by the rotor 28a.

  A rear case cover 29 defining a primary transmission chamber 30 is coupled to the rear end surface of the crankcase 10 between the crankcase 10 and the rear end portion of the crankshaft 25. The torque converter 31 that couples the pump impeller 31a to is housed.

  5 and 7, the transmission M housed in the crankcase 10 has first and second shafts that are rotatably supported by the crankcase 10 and have an axis parallel to the crankshaft 25. A gear train of a plurality of shift stages, for example, a first gear to a sixth gear train G1 to G6 is provided between the second main shafts 35A and 35B and the counter shaft 36 so as to be selectively established.

  Specifically, an odd-numbered first gear train G1, a third gear train G3, and a fifth gear train G5 are provided between the first main shaft 35A and the counter shaft 36, and the second main shaft 35B and the counter shaft. 36, an even-numbered second gear train G2, a fourth gear train G4, and a sixth gear train G6 are provided.

  Thus, the transmission T is disposed on the left and right sides of the crankshaft 25. Due to the arrangement, the upper surfaces of the crankcase 10 and the rear case cover 29 project widely toward the transmission T side, and the exhaust pipe is placed in a space S surrounded by these projecting upper surfaces and one side surface of the cylinder block 11. 22 is arranged.

  In the primary transmission chamber 30, a transmission cylinder shaft 37 adjacent to the second main shaft 35B in the axial direction is attached to an intermediate portion near the rear end of the first main shaft 35A so as to be relatively rotatable. A turbine runner 31 b of the torque converter 31 is connected to the shaft 37 via a primary transmission gear train 38 and a torque damper 49. A first clutch 41A is interposed between the transmission cylinder shaft 37 and the first main shaft 35A, and a second clutch 41B is interposed between the transmission cylinder shaft 37 and the second main shaft 35B.

  The first clutch 41A and the second clutch 41B are both configured as a hydraulic multi-plate type. When no hydraulic pressure is supplied to the respective hydraulic chambers, the first clutch 41A and the second clutch 41B are turned on by a spring force, and the hydraulic pressure is supplied to the respective hydraulic chambers. When supplied, it is turned off, and the transmission between the transmission cylinder shaft 37 and the first main shaft 35A is enabled by the on state of the first clutch 41A, and the transmission cylinder shaft is driven by the on state of the second clutch 41B. Transmission between 37 and the second main shaft 35B is possible. Supply and disconnection of hydraulic pressure to and from the hydraulic chambers of the first and second clutches 41A and 41B are controlled by a clutch control valve 42.

  An output shaft 43 arranged in parallel with the counter shaft 36 is supported by the crankcase 10, and the output shaft 43 is connected to the counter shaft 36 through an output gear train 44 at the intermediate portion thereof, while both ends thereof are connected. A portion is connected to the front and rear propeller shafts 32 and 33 outside the crankcase 10.

  5 and 8, a balancer shaft 45 that is reversely driven from the crankshaft 25 through the same-diameter gear train 46 to reduce engine vibration is supported by the crankcase 10 in a posture parallel to the crankshaft 25. At that time, the balancer shaft 45 is disposed on the opposite side of the exhaust pipe 22 across the plane Y including the axis of the crankshaft 25 and the cylinder axis of the cylinder block 11, and is connected to the front end of the balancer shaft 45 and driven. A water pump 47 is provided on the front case cover 26, and first and second oil pumps 48 and 49 connected to the rear end portion of the balancer shaft 45 are provided on the rear end wall of the crankcase 10. .

  The oil path including the first and second oil pumps 48 and 49 will be described with reference to FIG.

  The engine E is an oil pan 50 (see FIG. 5) at the bottom of the crankcase 10 for storing oil, and an oil tank 51 formed in the rear case cover 29 so as to be positioned higher than the oil pan 50. (See FIG. 5). The oil stored in the oil pan 50 is pumped up by the first oil pump 48 through the oil strainer 54 and sent to the oil tank 51. The oil in the oil tank 51 is first supplied to the oil filter 52 by the second oil pump 49. Pumped. The oil filtered by the oil filter 52 is sent to a water-cooled oil cooler 53 using engine cooling water. After being cooled, a part of the oil is supplied as a working oil via the clutch control valve 42 to the first. And the second clutches 41A and 41B are selectively supplied, the other part is supplied to the torque converter 31 as working oil, and the oil that has passed through the torque converter 31 is supplied to the crankshaft 25 as lubricating oil. The remaining oil is supplied as lubricating oil to the valve mechanism in the cylinder head 12 and the transmission T in the crankcase 10. The oil that has finished lubricating the crankshaft 25, the cylinder head 12, and the transmission T flows down to the oil pan 50.

  4 to 6 again, the oil cooler 53 is attached to the upper surface of the rear case cover 29 covering the torque converter 31, and the oil filter 52 is attached to the side surface thereof. The oil cooler 53 is disposed so as to protrude along the cylinder block 11 from the upper surface of the rear case cover 29, and the oil filter 52 is connected to the exhaust pipe 22 between the torque converter 31 and the oil cooler 53 with the plane Y interposed therebetween. Located on the opposite side.

  Next, the operation of this embodiment will be described.

  As described above, the exhaust pipe 22 connected to the exhaust port 14 opened on one side surface in the left-right direction of the cylinder head 12 extends forward of the cylinder head 12 and then makes a U-turn so that one side of the cylinder block 11 is located. The torque converter 31 is connected to the rear end of the crankshaft 25 and joined to the rear end surface of the crankcase 10 so as to cover the torque converter 31 with an oil cooler 53. When the front U-turn portion 22a of the exhaust pipe 22 becomes particularly hot, a sufficient distance is secured between the front U-turn portion 22a, the torque converter 31 and the oil cooler 53, and torque is increased. The converter 31 and the oil cooler 53 can be prevented from heat damage from the exhaust pipe 22. As a result, the front U-turn portion of the exhaust pipe 22 can be brought close to the front surface of the cylinder head 12. Therefore, the exhaust pipe 22 can be easily routed around the cylinder block 11 and the cylinder head 12. The enlargement of the power unit P can be avoided.

  Moreover, since the oil cooler 53 attached to the rear case cover 29 is disposed along the protruding direction of the cylinder block 11 from the upper surface of the rear case cover 29, the dead space above the rear case cover 29 is used for the installation of the oil cooler 53. Effectively, the oil cooler 53 can be protected from contact with other objects by the cylinder block 11 and the rear case cover 29 while avoiding the enlargement of the power unit P due to the oil cooler 53.

  Further, since the oil filter 52 is attached to the side surface of the rear case cover 29 so as to be disposed between the torque converter 31 and the oil cooler 53, the dead space between the torque converter 31 and the oil cooler 53 is used for the installation of the oil filter 52. Effective use can prevent the power unit P from being enlarged by the oil filter 52. Moreover, since the oil filter 52 is disposed on the opposite side of the exhaust pipe 22 passing through one side of the cylinder block 11 with the plane Y including the axis of the crankshaft 25 and the cylinder axis of the cylinder block 11 interposed therebetween, the exhaust pipe The maintenance of the oil filter 52 can be easily performed without being obstructed by the motor 22.

  A balancer shaft 45 driven by the crankshaft 25 is disposed on the opposite side of the exhaust pipe 22 across a plane Y including the axis of the crankshaft 25 and the cylinder axis of the cylinder block 11, and a rear end portion of the balancer shaft 45. Since the first and second oil pumps 48 and 49 driven by the rear case cover 29 are provided on the rear end wall of the crankcase 10 covered by the rear case cover 29, the first and second oil pumps 448 and 49 and the oil filter 52 are Both are disposed on the opposite side of the exhaust pipe 22 across the plane Y including the axis of the crankshaft 25 and the cylinder axis of the cylinder block 11, while avoiding thermal damage to the exhaust pipe 22. The oil flow path between the second oil pumps 48 and 49 and the oil filter 52 can be shortened.

  Further, the transmission T is arranged on one side of the left and right sides of the crankshaft 25, and a space surrounded by the upper surfaces of the crankcase 10 and the rear case cover 29 corresponding to the transmission T and one side surface of the cylinder block 11. Since the exhaust pipe 22 is arranged in S, exhaust is performed using a relatively wide space S formed by the upper surfaces of the crankcase 10 and the rear case cover 29 corresponding to the transmission T and one side surface of the cylinder block 11. The pipes 22 can be freely arranged, and interference with other parts of the exhaust pipe 22 can be easily avoided, so that the degree of freedom of the layout of the exhaust pipe 22 is improved. In addition, an oil cooler 53 that cools the oil discharged from the first and second oil pumps 48 and 49 is provided on the upper surface of the rear case cover 29 that is out of the space S, and the other side surface side of the cylinder block 11 of the rear case cover. The oil filters 52 that filter the oil discharged from the first and second oil pumps 48 and 49 are attached to the side surfaces, so that a sufficient distance between the exhaust pipe 22, the oil cooler 53, and the oil filter 52 is secured. Thus, heat damage to the oil cooler 53 and the oil filter 52 of the exhaust pipe 22 can be prevented.

  Further, an intake port 13 is opened on one side surface of the cylinder head 12 in the left-right direction and an exhaust port 14 is opened on the other side surface. The throttle body 16 is slanted so that its intake passage 16a approaches the cylinder head 12 toward the downstream side. In this position, it is disposed immediately before the cylinder head 12, and the downstream end of the intake passage 16a and the intake port 13 are connected via an intake pipe 15 bent in a U-shape. An air cleaner 18 is connected via an air duct 17 bent upward and an exhaust pipe 22 connected to the exhaust port 14 is connected to the front side of the cylinder head 12 below the intake pipe 15 from the exhaust port 14. And is bent downward in a U shape so as to extend toward the rear side of the cylinder block 11 and close to one side surface of the cylinder block 11. By connecting the rear end to the muffler 23 disposed behind the power unit P, the throttle body 16 and the exhaust pipe 22 can be disposed at a sufficient distance from each other on the front side of the cylinder head 12. The influence of heat damage from the exhaust pipe 22 to the throttle body 16 can be avoided, and the space behind the cylinder head 12 can be freely used for installing auxiliary equipment such as the oil cooler 53.

  In addition, the intake pipe length from the air cleaner 18 to the intake port 13 and the exhaust pipe length from the exhaust port 14 to the muffler 23 can be sufficiently secured, thereby improving the low speed and medium speed output performance of the engine E. .

  Further, the connection port 18a of the air cleaner 18 to the upstream end of the air duct 17 is offset e from the central portion in the left-right direction of the air cleaner 18 on the side opposite to the intake port 13, thereby making the intake pipe length longer. Can contribute to further improvement of the output performance of the engine E.

  Further, since the air cleaner 18 is configured so as to straddle between the left and right main frames 1L, 1R, a sufficient capacity can be given to the air cleaner 18, and the output performance of the engine E can be improved.

  Further, an exhaust pipe is formed so as to bypass the rear frame 5 of the main frame 1L and extend outside the main frame 1L and then extend rearward. The rear end of the exhaust pipe 22 is connected to the main frame 1L. The muffler 23 can be effectively cooled by the traveling wind flowing outside the main frame 1L.

  Further, a pair of left and right steps 24, 24 projecting outward from the main frames 1L, 1R are disposed below the engine E, so that they are not interfered by the exhaust pipe 22 passing through the inside of the main frame 1L. , The driver's foot space can be expanded.

  Further, the exhaust pipe 22 is formed so as to extend linearly toward the rear side while being close to the upper surface of the crankcase 10 inside the main frame 1L on the same side as the exhaust pipe 22 on the front side of the cylinder head 12. The radius of curvature of the U-shaped bent portion of the exhaust pipe 22 can be maximized, which can contribute to a reduction in exhaust resistance and thus an improvement in the output performance of the engine E.

  Further, since the fuel injection valve 20 capable of injecting fuel toward the intake port 13 is mounted on the upper peripheral wall of the intake pipe 15, the injection hole of the fuel injection valve 20 can be brought as close as possible to the combustion chamber of the engine E. As a result, the injected fuel can be efficiently supplied to the combustion chamber of the engine E to improve fuel efficiency. In addition, the upper side bone 2 of one main frame 1R passing above the fuel injection valve 20 is formed in a mountain shape with the top portion of the fuel injection valve 20 as the top, so that the above mountain-shaped portion of the main frame 1R The fuel injection valve 20 can be protected.

  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 gist of the present invention.

E ... Engine P ... Power unit T ... Transmission Y ... Plane 10 ... Crankcase 11 ... Cylinder block 12 ... Cylinder head 12 ... Cylinder head 22 ... Exhaust pipe 22a ... Front U-turn part 25 ... Crankshaft 29 ... Rear case cover 31 ... Torque converters 35A, 35B ... Main shaft (first and second main shafts)
45 ... Balancer shafts 48, 49 ... Oil pump (first and second oil pumps)
52 ... Oil filter 53 ... Oil cooler

Claims (7)

An engine (E) including a crankcase (10) for supporting a crankshaft (25) disposed along the longitudinal direction of the vehicle, and a cylinder block (11) standing on the upper surface of the crankcase (10); , A torque converter (31) connected to one end of the crankshaft (25), and a main shaft (35A) arranged in parallel to the crankshaft (25) and connected to the output side of the torque converter (31) , 35B) and the transmission (T) accommodated in the crankcase (10), and an exhaust pipe (22) connected to the cylinder head (12) above the cylinder block (11), The vehicle power that extends forward of the cylinder head (12) and then makes a U-turn and extends rearward through one side of the cylinder block (11). In the unit,
The torque converter (31) is connected to the rear end of the crankshaft (25) and is joined to the rear end surface of the crankcase (10) to cover the torque converter (31). A vehicle power unit comprising an oil processing device (52, 53) for processing oil discharged from an oil pump (48, 49) driven by a crankshaft (25). The power unit for a vehicle according to claim 1,
As the oil processing device, an oil cooler (53) for cooling the oil discharged from the oil pump (48, 49) is projected from the upper surface of the rear case cover (29) along the cylinder block (11). A vehicle power unit characterized by being arranged. The vehicle power unit according to claim 1 or 2,
An oil as the oil processing device is disposed on the side surface of the rear case cover (29) between the torque converter (31) and the oil cooler (53) to filter the oil discharged from the oil pump (48, 49). A vehicle power unit, wherein a filter (52) is attached. The vehicle power unit according to claim 3,
The oil filter (52) is disposed on the opposite side of the exhaust pipe (22) across a plane (Y) including the axis of the crankshaft (25) and the cylinder axis of the cylinder block (11). A vehicle power unit. The vehicle power unit according to claim 4,
A balancer shaft (45) driven by the crankshaft (25) to reduce vibration of the engine (E) is disposed on the opposite side of the exhaust pipe (22) across the plane (Y). A power unit for vehicles, wherein the oil pump (48, 49) is connected to a rear end portion of 45. In the vehicle power unit according to any one of claims 1 to 5,
The vehicle power unit, wherein the oil pump (48, 49) is attached to a rear end wall of the crankcase (10) covered with the rear case cover (29). The vehicle power unit according to claim 1,
The transmission (T) is arranged on one side of the left and right sides of the crankshaft (25), the upper surfaces of the crankcase (10) and the rear case cover (25) corresponding to the transmission (T), the cylinder An exhaust pipe (22) is arranged in a space (S) surrounded by one side of the block (11), and the oil pumps (48, 49) are placed on the upper surface of the rear case cover (25) removed from the space (S). The oil cooler (53) as the oil processing device is cooled, and the oil pump (48, 49) is disposed on the other side of the cylinder block (11) of the rear case cover (25). The oil filter (52) as the oil processing device for filtering the discharged oil is attached to the vehicle power unit.

Images