JP3726833B2 - Lubricating device for a 4-cycle engine for motorcycles - Google Patents

Description

The present invention relates to a lubricating device for a four-cycle engine for a motorcycle .

  Since an engine mounted on a vehicle such as a motorcycle has a large number of sliding parts and rotating parts, lubricating oil is supplied to each part using a lubricating device, and the frictional resistance of each part is reduced by the action of the lubricating oil. It has been reduced so that the engine functions fully. In addition, there is a type in which each part of the engine is actively cooled with lubricating oil.

  For example, in a general lubrication oil path of a cycle engine lubrication system that employs a wet sump method, the lubrication oil stored in an oil pan provided at the bottom of the engine case of the engine is sucked up by an oil pump, After being filtered by a filter and possibly cooled by an oil cooler, it is sent to each lubricating part in the engine via a main gallery formed in the engine case.

  The oil passage from the oil pump to the main gallery is generally orthogonal to the mounting surface of the oil filter because of the mold configuration of the engine case.

  However, depending on the configuration of the engine such as the arrangement of an oil pump, an oil filter, and an oil cooler, a large number of communication passages are required to form the oil passage. As a result, the processing time of the engine case increases, and a large number of plugs in the communication passage are required, leading to cost increase.

  In addition, the communication passages are arranged orthogonal to each other for the reason of the engine case mold configuration, as in the case of the oil passages. As a result, the oil passages become longer and are arranged orthogonal to each other, leading to a decrease in hydraulic pressure. There is a fear. This unnecessary decrease in hydraulic pressure leads to an unnecessary increase in the size of the oil pump, which is not preferable because of restrictions on layout, an increase in weight, and an increase in mechanical loss.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a lubricating device for a four-cycle engine for a motorcycle that simplifies and shortens an oil passage from an oil pump to a main gallery. .

In order to solve the above-described problem, a lubricating device for a four-cycle engine for a motorcycle according to the present invention comprises a tank rail and a center frame as a vehicle body frame around the engine. a cylinder block disposed tilted forward and at least two dividable engine case in a direction, a transmission mechanism disposed on the engine rear side of the crankshaft, and the mating surfaces of the upper and lower engine case rearwardly upward, the engine A four-cycle engine for motorcycles in which an oil pan is attached to the lower surface of the case and an oil passage is formed to guide the lubricating oil in the oil pan from the oil pump to the main gallery, and an oil filter and an oil cooler are arranged in the middle of the oil passage. In the lubricating device of the above, the main gallery is In conjunction with parallel arranged with the crank shaft, disposed in parallel to the oil discharge passage which extends toward the front of the engine case from the oil pump from the oil pump to the mating surface of the engine case, a strainer, the The oil pump and the transmission mechanism are arranged side by side in the vertical direction, the oil filter and the oil cooler are arranged below the combustion chamber of the engine, and the oil filter mounting seat and the oil cooler mounting seat are on the front of the lower engine case in which they are arranged side by side in the width direction.

Further, in order to solve the above-described problem, as described in claim 2, the oil pumping port of the oil pump is set to the rear side of the center of the oil pump in the vehicle traveling direction, while the oil discharge port is It is arrange | positioned at the front side of the said oil pump center toward the vehicle advancing direction, respectively , and the oil from the said engine case is discharged from an engine case in parallel with the mating surface of the said engine case .

Furthermore, in order to solve the above problems, as described in claim 3, the 4-cycle engine is a parallel 4-cylinder engine, and the oil filter and the oil cooler, located in the central portion of the parallel four-cylinder engine those disposed below the cylinder to be.

According to the lubricating device for a four-cycle engine for a motorcycle according to the present invention, the passages can be arranged at the shortest distance without interfering with each other, and the oil passage can be simplified and the cost can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a left side view showing an example of a motorcycle to which the present invention is applied.

  As shown in FIG. 1, the motorcycle 1 has a body frame 2, and a head pipe 3 is provided in front of the body frame 2. The head pipe 3 is provided with a suspension mechanism (not shown) and is provided with a steering mechanism 7 including a pair of left and right front forks 5 and a handle bar 6 that rotatably supports the front wheel 4. Is steered so as to be pivotable left and right.

  On the other hand, the body frame 2 is of a twin tube type, for example, and is expanded in the left-right direction immediately after the head pipe 3 and then a pair of left and right tank rails 8 extending rearward and obliquely downward in parallel with each other. A pair of left and right center frames 9 connected to the rear end portion and extending substantially upward and downward, and a pair of left and right seat rails 10 extending rearward from the rear upper end of the center frame 9.

  A fuel tank 11 is disposed above the tank rail 8, and an operation seat 12 is disposed above the seat rail 10. Further, a pivot shaft 13 is installed substantially at the center lower portion of the center frame 9, and a swing arm 14 is pivotally attached to the pivot shaft 13 so as to be swingable around the pivot shaft 13, and a rear end is provided at the rear end of the swing arm 14. The wheel 15 is pivotally supported. An engine 16 is disposed below the center of the vehicle body between the front and rear wheels 4 and 15 and below the fuel tank 11.

  Further, in the motorcycle 1, the front portion of the vehicle body is covered with a streamlined cowling 17 so as to reduce air resistance during traveling and protect the rider from traveling wind pressure.

  FIG. 2 is a left side view of the engine 16, most of which is shown in a longitudinal section. FIG. 3 is a right side view of the engine 16 and a part thereof is shown in a longitudinal section. 4 is a cross-sectional view taken along the line IV-IV in FIG. As shown in FIGS. 2 to 4, the engine 16 is a four-cycle parallel four-cylinder engine, and an outer shape is mainly configured by a cylinder head cover 18, a cylinder head 19, a cylinder block 20, and an engine case 21.

  The engine case 21 is of a split type, and is composed of, for example, an upper engine case 21a, a center engine case 21b, and a lower engine case 21c that are divided into three in the vertical direction in the figure and in which the cylinder block 20 is integrally formed.

  The cylinder block 20 is inclined slightly forward from the upright, and the mating surfaces of the engine cases 21a, 21b, and 21c are formed so as to be forwardly lowered (or rearwardly raised) perpendicular to the central axis of the cylinder block 20, while The lower engine case 21c, which is the side engine case, is formed substantially horizontally.

  Bearing portions 22 are formed on the inner surfaces of the upper engine case 21a and the center engine case 21b so as to be divided into upper and lower portions, and a crankshaft 23 extending in the width direction of the engine 16 is rotatably supported by these bearing portions 22. Is done.

  A large end 24 a of a connecting rod 24 is connected to the crankshaft 23, and a piston 25 is connected to a small end 24 b of the connecting rod 24. A piston 25 is accommodated in the cylinder block 20 so as to be slidable in the vertical direction in the figure. A combustion chamber 26 is formed in the space between the cylinder head 19 and the piston 25, and a spark plug 27 is screwed to the center of the combustion chamber 26 from the outside.

  The reciprocating stroke of the piston 25 is converted into a rotational motion by the crankshaft 23, and passes through a clutch mechanism and a transmission mechanism (not shown) in the space formed by the center engine case 21b and the lower engine case 21c (see FIG. 1). Is transmitted to the rear wheel 15 which is a driving wheel.

  A charging device 29 is provided at one end of the crankshaft 23. On the other hand, a cam chain drive sprocket 30 is provided at the other end of the crankshaft 23. The cam chain drive sprocket 30 is operatively connected via a cam chain 34 to a cam sprocket 33 provided at the end of a cam shaft 32 of a valve gear 31 provided in the cylinder head 19. Then, the rotation of the crankshaft 23 is transmitted to the camshaft 32 via the cam chain 34, whereby the valve gear 31 is operated and the intake / exhaust valve 35 is opened / closed. The upper part of the cylinder head 19 is closed by the cylinder head cover 18.

  The air-fuel mixture supply means to the engine 16 used in the motorcycle 1 is a fuel injection type, and a throttle body 38 having a fuel injector 37 is connected to an intake port 36 formed in the cylinder head 19. The throttle body 38 includes a throttle valve 40 in the intake passage 39, and a fuel injector 37 that injects fuel directly on the downstream side of the throttle valve 40 is provided. The throttle body 38 is disposed on the rear upper side of the engine 16, and an air cleaner 41 is connected to the upstream side of the throttle body 38.

  By the way, the engine 16 is provided with an engine lubrication device, and the lubricating oil stored in the oil pan 42 provided at the lower part of the lower engine case 21c is passed through the oil filter 44 and the oil cooler 45 by the oil pump 43. It is pumped to each part in the engine 16 such as the crankshaft 23, the valve gear 31, the transmission mechanism (not shown).

  FIG. 5 is a plan view of the lower engine case 21c, and FIG. 6 is a front view of the lower engine case 21c. As shown in FIGS. 2 to 6, an oil pump 43 driven by, for example, the crankshaft 23 is disposed on the right side surface of the lower engine case 21 c in the traveling direction of the vehicle, for example. An oil pumping passage 47 extends from the oil pumping port 46 of the oil pump 43 into the oil pan 42, and a strainer 48 for removing relatively large foreign matters in the lubricating oil is provided at the upstream end thereof.

  On the other hand, from the oil discharge port 49 of the oil pump 43, the oil discharge passage 50 as the first oil passage is parallel to the mating surface of the center engine case 21b and the lower engine case 21c toward the front of the lower engine case 21c, that is, It is arranged in front of the vehicle and in parallel with the traveling direction axis 51 of the vehicle.

  The front surface of the lower engine case 21c is orthogonal to the mating surface with the oil pan 42 formed substantially horizontally, that is, substantially perpendicular, and an oil filter mounting seat 52 and an oil cooler mounting seat 53 are formed on this surface. 16 are arranged in the width direction. In this embodiment, the oil filter mounting seat 52 is disposed on the side where the oil pump 43 is disposed, that is, on the right side in the traveling direction of the vehicle, and the oil cooler mounting seat 53 is disposed on the left side on the opposite side. . 6 is a front view of the lower engine case 21c, the oil filter mounting seat 52 is shown on the left side, and the oil cooler mounting seat 53 is shown on the right side.

  Although not shown in detail, the oil filter 44 attached to the oil filter mounting seat 52 has a circular mounting surface, an oil outlet 54 at the center, and an oil inlet 55 around the oil outlet 54. In general, a filter element 56 is provided between the oil inlet 55 and the oil outlet 54. An oil inlet 57 and an oil outlet 58 are concentrically disposed on the mounting seat 52 of the oil filter, and the oil outlet 58 is located on the center side corresponding to the oil outlet 54 of the oil filter, and the oil inlet of the oil filter. 55, oil inlets 57 are respectively arranged on the outer peripheral side, and the downstream end of the oil discharge passage 50 extending from the oil outlet 49 is connected to the oil inlet 57.

  On the other hand, although not shown in detail, the oil cooler 45 attached to the oil cooler mounting seat 53 also has a circular mounting surface, and an oil inlet (not shown) at the center is provided around the oil inlet. An oil outlet (not shown) is formed in the water-cooled type in which a water jacket (not shown) is provided between the oil inlet and the oil outlet. An oil inlet 59 and an oil outlet 60 are concentrically disposed on the mounting seat 53 of the oil cooler, and the oil outlet 60 is arranged on the outer peripheral side corresponding to the oil outlet of the oil cooler 45, and the oil of the oil cooler 45. Corresponding to the inlets, oil inlets 59 are respectively arranged on the center side.

  The oil inlet 57 of the oil filter and the oil outlet 60 of the oil cooler are vertically separated from each other. In this embodiment, the oil outlet 60 of the oil cooler is disposed above the oil inlet 57 of the oil filter. (See FIG. 6).

  An oil outlet 58 connected to the oil outlet 54 of the oil filter and an oil inlet 59 connected to the oil inlet of the oil cooler 45 are connected by a communication path 61. The communication passage 61 includes a main passage 61a disposed in parallel with the crankshaft 23 behind the oil filter 44 and the oil cooler mounting seat 53 and below the oil discharge passage 50, and an oil outlet 58 of the main passage 61a and the oil filter. And two connecting passages 61b, which are second oil passages that connect the oil inlet 59 of the oil cooler, and these connecting passages 61b are provided with an oil filter mounting seat 52 and an oil cooler mounting seat 53. The lower engine case 21c that is orthogonal to the front surface of the lower engine case 21c and is substantially horizontal and parallel to the mating surface of the oil pan 42, that is, substantially horizontal.

  A main gallery 62 is disposed in parallel with the crankshaft 23 in the width direction of the engine 16 above the oil discharge passage 50 and below the crankshaft 23. Further, an oil supply passage 63 as a third oil passage from the oil outlet 60 connected to the oil outlet of the oil cooler 45 toward the main gallery 62 is parallel to the mating surface of the center engine case 21b and the lower engine case 21c. That is, it is arranged rearward and parallel to the traveling direction axis 51 of the vehicle.

  The oil discharge passage 50, the communication passage 61, and the oil supply passage 63 form an oil passage from the oil pump 43 to the main gallery 62. Further, the upper engine case 21a and the center engine case 21b are combined from the main gallery 62. An oil supply path 64 extends toward the bearing portion 22 of the crankshaft 23 provided inside the surface.

  Next, the operation of this embodiment will be described.

  Lubricating oil in the oil pan 42 is pumped up by the oil pump 43 and is pumped to the oil filter 44 through the oil discharge passage 50. Lubricating oil is introduced into the oil filter 44 from the oil inlet 55, filtered by the filter element 56, and then guided from the oil outlet 54 to the oil cooler 45 through the communication passage 61 (main passage 61a and connection passage 61b). It is burned. The lubricating oil cooled by the oil cooler 45 is guided from the oil outlet to the main gallery 62 through the oil supply passage 63, and further reaches the bearing portion 22 of the crankshaft 23 through the oil supply passage 64. Lubricating oil is guided to the sliding contact surface between the crankshaft 23 and the large end portion 24a of the connecting rod 24 through another oil supply passage 65 formed in the crankshaft 23, and is illustrated from the main gallery 62. Not guided to other parts of the engine 16 through other oil supply paths.

  Then, the lubricating oil that has lubricated each part of the engine 16 naturally falls in the engine case 21 or is returned to the oil pan 42 via an oil return hole, an oil return passage, etc. (not shown) and recirculated.

  Both the oil discharge passage 50 and the oil supply passage 63 are arranged in parallel to the mating surface of the center engine case 21b and the lower engine case 21c, that is, forwardly downward (or rearwardly upward), and the oil outlet 54 of the oil filter and the oil The connection path 61b of the communication path 61 that communicates with the oil inlet of the cooler 45 is orthogonal to the front surface of the lower engine case 21c and parallel to the mating surface of the lower engine case 21c and the oil pan 42, that is, substantially horizontally. As a result of the arrangement, the passages can be arranged at the shortest distance without interfering with each other even within a narrow range. As a result, the oil passage is simplified, the processing time of the engine case 21 is shortened, the number of parts is reduced, and the cost can be reduced.

  An oil inlet 57 and an oil outlet 58 are concentrically disposed on the oil filter mounting seat 52, and an oil inlet 59 and an oil outlet 60 are concentrically disposed on the oil cooler mounting seat 53. Since the oil outlet 58 of the oil filter and the oil inlet 59 of the oil cooler connected to the connecting passage 61b of the communication passage 61 orthogonal to the front of the lower engine case 21c are arranged on the center side, the oil passage is not prepared. Crossing, that is, interference between the passages can be prevented.

  Further, an oil inlet 57 of the oil filter and an oil outlet 60 of the oil cooler to which the oil discharge passage 50 and the oil supply passage 63 are connected are arranged on the outer peripheral side, and are separated from each other in the vertical direction when viewed from the front. As a result, inadvertent crossing of the oil passages, that is, interference between the passages can be prevented.

1 is a left side view of a motorcycle showing an embodiment of a lubrication device for a four-cycle engine according to the present invention. The left side sectional view of an engine. The right view of an engine. Sectional drawing which follows the IV-IV line | wire of FIG. The top view of a lower engine case. The front view of a lower engine case.

Explanation of symbols

16 4-cycle engine 21a Upper engine case 21b Center engine case 21c Lower engine case (lower engine case)
23 Crankshaft 42 Oil pan 43 Oil pump 44 Oil filter 45 Oil cooler 46 Oil pumping port 49 Oil discharge port 50 Oil discharge passage (first oil passage)
52 Oil filter mounting seat 53 Oil cooler mounting seat 54 Oil filter oil outlet 55 Oil filter oil inlet 61b Communication path connection path (second oil path)
62 Main gallery 63 Oil supply passage (third oil passage)

Claims (3)

The body frame around the engine is composed of a tank rail and a center frame, and it has an engine case that can be divided at least in the vertical direction and a cylinder block that is tilted forward, and a transmission mechanism on the rear side of the crankshaft. The upper and lower engine case mating surfaces are rearwardly raised, and an oil pan is attached to the lower surface of the engine case, while an oil passage is formed to guide the lubricating oil in the oil pan from the oil pump to the main gallery. In a lubricating device for a motorcycle four-cycle engine in which an oil filter and an oil cooler are disposed in the middle of the engine, the main gallery is disposed in parallel to the crankshaft in the width direction of the engine, and from the oil pump to the engine case. Oy which extends toward the front Arranged parallel to the discharge passage from the oil pump to the mating surface of the engine case, a strainer, together with the oil pump and the transmission mechanism are arranged in the vertical direction, the oil filter and the oil cooler combustion chamber of the engine lubrication is disposed below, further attachment seat and the mounting seat of the oil cooler of the oil filter of the motorcycle four-cycle engines, characterized in that arranged side by side in the width direction in front of the lower side of the engine case apparatus. While that is the rear side of the oil pump central oil pumping port of the oil pump toward the vehicle traveling direction, the oil discharge port are respectively disposed on the front side of the oil pump center toward the vehicle traveling direction, the engine case 2. A four-cycle engine lubricating system for a motorcycle according to claim 1 , wherein oil from the engine case is discharged from the engine case in parallel with the mating surface of the engine case . The 4-cycle engine is a parallel 4-cylinder engine, the oil filter and the oil cooler and the, the parallel 4-cylinder engine according to claim 1 or 2 motorcycle 4-cycle engine according arranged below the cylinder positioned at the center of Lubrication equipment.

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