CN1121547C - Lubricating apparatus for engine - Google Patents

Abstract

In the engine lubricating device of the present invention, an oil pump that discharges oil in conjunction with the rotation of the crankshaft is arranged in the crankcase, and the oil pump can be assembled separately from the crankcase, thereby improving the assembly and integrity of the oil pump. A holder 34 supporting the rotatable crankshaft 20 is attached to the mounted surface 108 of the crankcase 26 , and the holder 34 and the cover 91 fastened to the holder 34 constitute the pump casing 90 of the oil pump 82 .

Description

engine lubricator

The present invention relates to a lubricating device for an engine. In the lubricating device, an oil pump is arranged in a crankcase to discharge oil in conjunction with the rotation of a crankshaft.

Existing lubricating devices of this type include, for example, the types disclosed in Japanese Patent Application Publication No. 61-63492.

However, in the above-mentioned conventional lubricating device, the pump housing of the oil pump is composed of a crank case and a cover attached to the crank case. When assembling the oil pump to the engine, it is necessary to assemble the pump components such as the rotor to the crank case. , so the assembly and integrity are poor.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a lubricating device for an engine that can be assembled with an oil pump separately from a crankcase, thereby improving the assemblability and integrity of the oil pump.

In order to achieve the above object, the engine lubricating device described in Claim 1 of the present invention is that an oil pump that discharges oil in conjunction with the rotation of the crankshaft is disposed in the crankcase, and is characterized in that the crankshaft is supported freely rotatably by a holder. The seat is installed on the mounted surface of the crankcase, and the above-mentioned holding seat and the cover fastened on the holding seat constitute the pump casing of the oil pump. The rotating shaft of the oil pump meshes with the driving gear fixed on the crankshaft through the driven gear.

According to this structure, the oil pump can be assembled on the side of the holder attached to the crankcase, and the holder with the oil pump assembled can be attached to the crankcase, so that the assemblability and integrity of the oil pump can be improved.

The invention described in claim 2 of the present invention is characterized in that, in the engine lubricating device described in claim 1, a discharge passage is provided on the above-mentioned holder, one end of the discharge passage communicates with the discharge port of the oil pump, and the other end of the discharge passage is installed on the above-mentioned The mounting surface of the holder on the mounting surface is open, and the above-mentioned crankcase is provided with a discharge-side oil passage, and one end of the discharge-side oil passage communicates with the other end of the discharge passage and opens to the above-mentioned mounted surface. Guided to the cylinder head side. According to this structure, the oil passage from the oil pump to the cylinder head side can be formed only by attaching the retainer to the crankcase, and the oil passage can be easily formed.

The invention described in Claim 3 of the present invention is characterized in that, in the engine lubricating device described in Claim 2, in order to clean the oil sucked up from the bottom of the crankcase, an oil filter is arranged at the bottom of the crankcase, and an oil filter is installed in the crankcase. There is a suction side oil passage on the top, one end of the suction side oil passage communicates with the oil filter, and the other end opens to the above-mentioned installed surface; a suction passage is provided on the above-mentioned holder, and one end of the suction side oil passage is connected to the suction side oil filter. The other end of the passage communicates with the above-mentioned installation surface of the holder and opens, and the other end communicates with the suction port of the oil pump. According to this structure, the oil passage from the bottom of the crankcase to the oil pump can be formed only by attaching the retainer to the crankcase, and the oil passage can be formed more easily.

Fig. 1 is a side view showing a rear portion of a motorcycle.

Fig. 2 is an enlarged cross-sectional view of line 2-2 in Fig. 1 .

Fig. 3 is an enlarged cross-sectional view along line 3-3 of Fig. 2 .

Fig. 4 is an enlarged sectional view of line 4-4 in Fig. 2 .

Fig. 5 is an enlarged sectional view of line 5-5 in Fig. 2 .

Next, the present invention will be described with reference to the illustrated embodiments.

1 to 5 show an embodiment of the present invention, and FIG. 1 is a side view showing a rear portion of a motorcycle. Fig. 2 is an enlarged cross-sectional view of line 2-2 in Fig. 1 . Fig. 3 is an enlarged cross-sectional view along line 3-3 of Fig. 2 . Fig. 4 is an enlarged sectional view of line 4-4 in Fig. 2 . Fig. 5 is an enlarged sectional view of line 5-5 in Fig. 2 .

In FIG. 1, a power unit P for driving a rear wheel WR is mounted swingably via a link 12 at the rear of a vehicle frame 11 of a scooter type motor vehicle.

As shown in FIG. 2 , the power unit P is composed of a single-cylinder engine 14 which is an air-cooled four-stroke engine, and a belt-type continuously variable transmission 15 extending from the left side of the engine 14 toward the rear of the vehicle body. On the right side of the rear end portion of the continuously variable transmission 15 is attached a rear wheel WR disposed behind the engine 14 . The rear of the continuously variable transmission 15 is connected to the rear end of the vehicle frame 11 through the rear buffer 16, the air filter 17 is supported on the continuously variable transmission 15, and the muffler 18 is supported on the right side of the continuously variable transmission 15. Side, below the engine 14, supports the main support 19 that can stand up and fall.

As shown in FIGS. 3 to 5 , the engine 14 includes a first engine body 22 and a second engine body 23 divided by a dividing surface 21 extending in the vertical direction along the crankshaft 20 . The first engine block 22 constitutes a cylinder block 24 and a crankcase half 25 , and a crankcase 26 accommodating the crankshaft 20 is composed of the crankcase half 25 and the second engine block 23 . That is, the crankcase 26 may be divided by a plane containing the rotational axis of the crankshaft 20 .

A cylinder head 27 is connected to the front end of the cylinder block 24 , and a cylinder head cover 28 is connected to the front end of the cylinder head 27 . A piston 30 is slidably fitted in a cylinder 29 of the cylinder block 24 , and the piston 30 is connected to the crankshaft 20 via a connecting rod 31 and a crank pin 32 .

On the crank case half 25 of the first engine body 22, a left retainer 33 and a right retainer 34 are respectively installed through a pair of bolts 35, 35, . 37 is rotatably supported by these holders 33 , 34 .

The continuously variable transmission 15 has a right side housing 38 and a left side housing 39 coupled to each other, and the front right side of the right side housing 38 is coupled to the left sides of the first and second engine bodies 22 and 23 . On the rear right side of the right side case 38, a speed reducer case 40 is combined.

At the left end of the crankshaft 20 protruding into the inside of the right side housing 38 and the left side housing 39, a drive pulley 41 is provided. The drive pulley 41 includes a fixed pulley half 42 fixed to the crank shaft 20 and a movable pulley half 43 capable of approaching or leaving the fixed pulley half 42 . The movable side pulley half 43 is pushed toward the fixed side pulley half 42 by the centrifugal weight 44 . The centrifugal weight 44 moves outward in the radial direction as the number of rotations of the crankshaft 20 increases.

The output shaft 45 is supported between the rear portion of the right side case 38 and the speed reducer case 40, and the driven pulley 46 provided on the output shaft 45 has a fixed side pulley half 47 rotatably supported on the output shaft 45. , and the movable side pulley half body 48 that can approach or leave the fixed side pulley half body 47, the movable side pulley half body 48 is pushed toward the fixed side pulley half body 47 by the spring 49. An engine clutch 50 is provided between the fixed-side pulley half 47 and the output shaft 45 . An endless V-shaped belt 51 is wound between the driving pulley 41 and the driven pulley 46 .

Between the right side housing 38 and the speed reducer housing 40, an intermediate shaft 52 parallel to the output shaft 45 and an axle 53 are supported, and between the output shaft 45, the intermediate shaft 52 and the axle 53, a reduction gear set 54 is provided. A rear wheel WR is provided at the right end of the axle shaft 53 that penetrates through the speed reducer housing 40 and protrudes to the right.

In this continuously variable transmission 15, when the engine 14 rotates at a low speed, the centrifugal force acting on the centrifugal weight 44 of the driving pulley 41 decreases, so under the action of the spring 49 of the driven pulley 46, the half body of the fixed side pulley The groove width between 47 and the movable side pulley half body 48 reduces, and the speed change ratio is low. When the number of rotations of the crankshaft 20 increases from this state, the centrifugal force acting on the centrifugal weight 44 increases, and the width of the groove between the fixed-side pulley half 42 and the movable-side pulley half 43 of the drive pulley 41 decreases. That is, the width of the groove between the fixed-side pulley half 47 and the movable-side pulley half 48 of the driven pulley 46 increases, so that the transmission ratio changes steplessly from low to high.

A rotor 56 of a generator 55 is connected to the right end portion of the crank shaft 20 protruding from the crank case 26 on the opposite side of the continuously variable transmission 15 . The stator 57 of the generator 55 is supported by the first engine body 22 , and the generator cover 88 covering the generator 55 is fastened to the first engine body 22 .

The cylinder block 24 of the engine 14 , a part of the cylinder head 27 and the generator 55 are covered by a cover 58 . In a portion corresponding to the outside of the generator 55, a louver 59 is provided on the cover 58, and a fan 60 is arranged between the louver 59 and the generator cover 88, and the fan 60 is coaxial with the crankshaft 20. connect. The fan 60 rotating together with the crankshaft 20 draws outside air from the louver 59 into the cover 58, so that the cooling air flow shown by the arrows in Figures 2 and 3 is generated in the cover 58, and a part of the cylinder head 27 And the cylinder block 24 is cooled by cooling air, while the generator 55 is also cooled by air.

The air intake valve 64 and the exhaust valve 65 are arranged on the cylinder head 27 so as to be pressed in the valve closing direction, respectively. The combustion chamber 61 formed between the cylinder heads 27 is communicated with or blocked from the intake port 62 and the exhaust port 63 provided on the cylinder heads 27 . The intake valve 64 and the exhaust valve 65 are driven to open and close by a valve device 66 .

The movable valve device 66 is equipped with a driving gear 67, a driven gear 68, a cam 69, a first suction side swing arm 70, a first discharge side swing arm 71, a suction side second swing arm 72, and a discharge side second swing arm. The arm 73 , the rod 74 connected between the first and second swing arms 70 and 72 on the suction side, and the rod 75 connected between the first and second swing arms 71 and 73 on the discharge side. The drive gear 67 is accommodated in the right holder 34 that supports the crankshaft 20 and is fixed to the crankshaft 20 . The driven gear 68 is rotatably supported by the right holder 34 and meshes with the above-mentioned drive gear 67 . The cam 69 is integrally formed with the driven gear 68 . The first suction-side swing arm 70 is capable of swinging around an axis parallel to the crankshaft 20 , is supported by the right holder 34 , and is in sliding contact with the above-mentioned cam 69 . The first exhaust-side swing arm 71 is capable of swinging around an axis parallel to the crankshaft 20 , is supported by the right holder 34 , and is in sliding contact with the above-mentioned cam 69 . The second suction-side swing arm 72 is swingable around an axis parallel to the first suction-side swing arm 70 , is supported by the cylinder head 27 , and is linked to the suction valve 64 in conjunction with each other. The exhaust-side second swing arm 73 is swingable around an axis parallel to the exhaust-side first swing arm 71 , is supported by the cylinder head 27 , and is linked to the exhaust valve 65 in conjunction with it.

In the crankcase half 25 , a triangular-shaped working chamber 76 is formed penetrating through the inside of the crankcase 26 . The working chamber 76 is disposed on the right side of the cylinder block 24 and gradually narrows toward the cylinder head 27 side. The passive gear 68 of the movable valve device 66 , part of the first suction-side swing arm 70 and the first discharge-side swing arm 71 , and the cam 69 are arranged in the above-mentioned operation chamber 76 . In addition, the rods 74, 75 are cross-arranged in an X shape when viewed from the side, and the rods 74, 75 are housed in cylindrical covers 78, 79 provided in the crankcase so as to be movable in the axial direction. Between half part 25 and cylinder head 27. The rods 74 and 75 connect the actuating valve chamber 77 formed between the cylinder head 27 and the cylinder head cover 28 to the actuating chamber 76 described above.

An oil reservoir 80 is formed at the bottom of the crankcase 26 , oil accumulated in the oil reservoir 80 is sucked into an oil pump 82 through an oil filter 81 , and the oil discharged from the oil pump 82 is pumped to each lubricating part of the engine 14 .

In the lower portion of the crankcase half 25 of the crankcase 26, a cylindrical filter chamber 83 with an open front is provided, and a cup-shaped oil filter 81 and a retaining spring 85 are housed in the filter chamber 83. The retaining spring 85 presses the sealing member 84 mounted on the open end of the oil filter 81 against the inner wall of the filter chamber 83 . The opening of the filter chamber 83 is closed by a cap 86 screwed to the crankcase half 25 .

The inside of the filter chamber 83 is divided by the filter 81 into a raw room inside the oil filter 81 and a clean room 87 outside the oil filter 81, and the oil storage part 80 communicates with the raw room.

The cap 86 also serves as an oil drain plug, and by removing the cap 86 and taking out the oil filter 81, the oil in the oil reservoir 80 can be discharged from the filter chamber 83 to the outside.

The pump casing 90 of the oil pump 82 is composed of a right holder 34 and a cover 91 fastened to the right holder 34 by a plurality of, for example, two bolts 92 , 92 . The rotor 93 housed in the pump casing 90 is connected to a rotary shaft 94 rotatably supported by the pump casing 90 . At the end of the rotary shaft 94 protruding from the pump casing 90 , a driven gear 95 meshing with the drive gear 67 fixed to the crankshaft 20 is fixed. That is, the oil pump 82 operates in conjunction with the rotation of the crankshaft 20 .

An outer ring of a ball bearing 37 that supports the right crank journal 20 b of the crankshaft 20 is fitted on the right holder 34 . On the axially outward side of the right crankshaft journal 20b, an oil seal 96 slidingly connected to the drive gear 67 fixed on the crankshaft 20 is installed on the right holder 34, between the outer surface of the ball bearing 37 and the drive gear 67. An annular oil chamber 97 is formed. In the crankshaft 20, on the outer surface of the crank arm 20c on the same side as the right crank journal 20b, an annular side plate 98 surrounding the right crank journal 20b is installed, and between the side plate 98 and the crank arm 20c, a An annular flat oil reservoir 99 . Further, on the outer surface of the right crank journal 20b, a plurality of oil grooves 100... that communicate between the oil chamber 97 and the oil reservoir 99 are provided.

Between the outer surface of the crank pin 32 and the large end portion 31a of the connecting rod 31, a needle bearing 103 is interposed. The hole 102 is provided in the crank pin 32 so as to communicate with the above-mentioned hollow portion 101 .

The oil pump 82 is equipped with first and second discharge ports 104, 105 and a suction port 106, and an oil passage 107 that communicates the first discharge port 104 with the oil chamber 97 is provided on the right holder 34.

Therefore, the oil discharged from the first discharge port 104 of the oil pump 82 is pressured to the oil passage 107, the oil chamber 97, the oil groove 100..., the oil reservoir 99, the hollow portion 101 of the crank pin 32, and the oil injection hole 102, so that , the ball bearing 37 is lubricated, and the outer surface of the crank pin 32, the needle bearing 103, and the large end portion 31a of the connecting rod 31 are lubricated.

The right holder 34 is installed on the mounted surface 108 provided on the crankcase half 25 of the crankcase 26, and the holder 34 is provided with a discharge path 110, and one end of the discharge path 110 is connected to the second discharge port of the oil pump 82. 105 communicates, and the other end opens toward the installation surface 109 of the right holder 34 installed on the above-mentioned installed surface 108 . On the crankcase half 25 of the crankcase 26, there is provided a discharge side oil passage 111 that guides the oil to the cylinder head 27 side, and one end of the discharge side oil passage 111 communicates with the other end of the discharge passage 110 so as to face the mounting surface. 108 openings.

The discharge side oil passage 111 communicates with the oil passage 112 provided on the cylinder block 24 and the cylinder head 27, and a flat oil reservoir 114 is formed between the oil retaining plate 113 mounted on the cylinder head cover 28 and the cylinder head cover 28. The oil passage 112 communicates with the oil reservoir 114 . Further, the oil retaining plate 113 is provided with oil injection holes 115 , 115 which inject oil to the second swing arms 72 , 73 on the oil supply side and exhaust side of the movable valve device 66 .

Therefore, the oil discharged from the second discharge port 105 of the oil pump 82 passes through the discharge oil passage 110 , the discharge side oil passage 111 , the oil passage 112 and the oil storage part 114 , and flows from the oil injection holes 115 , 115 to the above-mentioned valve device 66 . Two swing arms 72,73 eject.

A suction passage 116 is provided on the right holding base 34 , and one end of the suction passage 116 opens toward the above-mentioned mounting surface 109 , and the other end of the suction passage 116 communicates with the suction port 106 . The crankcase half 25 of the crankcase 26 is provided with a suction-side oil passage 117, one end of which is communicated with the clean room 87 of the oil filter 81, and the other end is communicated with one end of the above-mentioned suction passage 116 toward the The mounting surface 108 is open.

Therefore, at the suction port 106 of the oil pump 82 , the oil purified by the oil filter 81 is sucked through the suction side oil passage 117 and the suction passage 116 .

Next, the operation of this embodiment will be described. The right holder 34 supporting the rotatable crank shaft 20 is installed on the mounted surface 108 provided on the crankcase half 25 of the crankcase 26, and the right holder 34 and the cover 91 fastened on the right holder 34 , constitute the pump casing 90 of the oil pump 82 . Therefore, on the right holder 34 side installed on the crankcase 26, the assembly of the oil pump 82 can be carried out. Since the right holder 34 in the state of assembling the oil pump 82 can be installed on the crankcase 26, so the oil pump 82 can be improved. Assembly and integrity.

In addition, the right holder 34 is provided with a discharge passage 110, one end of the discharge passage 110 communicates with the second discharge port 105 of the oil pump 82, and the other end faces the mounting surface 109 of the right holder 34 installed on the mounted surface 108. Open your mouth. On the other hand, the crankcase half 25 is provided with a discharge side oil passage 111 which communicates with the other end of the discharge passage 110 and has one end open to the mounted surface 108 to guide oil to the cylinder head 27 side. Therefore, the oil passage from the oil pump 82 to the cylinder head 27 side can be formed only by attaching the right holder 34 to the crank case 26, so that the oil passage can be easily formed.

In addition, in order to clean the oil sucked from the oil reservoir 80 at the inner bottom of the crankcase 26, the oil filter 81 of the crankcase 26 is arranged, and the suction side oil passage 117 is provided on the crankcase half 25. One end of the suction side oil passage 117 communicates with the clean chamber 87 of the oil filter 81 , and the other end opens toward the mounting surface 108 . Moreover, the right holder 34 is provided with a suction passage 116 , which communicates with the other end of the suction side oil passage 117 , one end of which opens toward the mounting surface 109 of the right holder 34 , and the other end communicates with the suction port 106 . Therefore, only by attaching the right holder 34 to the crank case 26, the oil passage from the bottom of the crank case 26 to the oil pump 82 can be formed, and the oil passage can be formed more easily.

The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above embodiments, and various design changes can be made within the scope of the claims.

As described above, according to the invention described in claim 1 of the present invention, the oil pump can be assembled on the side of the holder, and the holder with the oil pump assembled can be attached to the crankcase, so the assemblability and integrity of the oil pump can be improved.

According to the invention described in claim 2 of the present invention, the oil passage from the oil pump to the cylinder head side can be formed by simply attaching the retainer to the crankcase, and the oil passage can be easily formed.

According to the invention described in claim 3 of the present invention, the oil passage from the bottom of the crankcase to the oil pump can be formed by simply attaching the retainer to the crankcase, and the oil passage can be formed more easily.

Claims (3)

1. The engine lubricating device, in the crank case (26), is equipped with the oil pump (82) that is linked with the rotation of the crankshaft (20) and discharges oil, and is characterized in that the above-mentioned crankshaft (20) can be freely rotatably supported. ) holder (34) is mounted on the mounted surface (108) of the crankcase (26), and the above-mentioned oil pump ( 82) of the pump casing (90), the rotating shaft (94) of the oil pump meshes with the drive gear (67) fixed on the crankshaft through the driven gear (95). 2. The engine lubricating device according to claim 1, characterized in that a discharge path (110) is provided on the above-mentioned holder (34), and one end of the discharge path (110) is connected to the discharge port (82) of the oil pump (82). 105) communicates, and the other end opens toward the installation surface (109) of the holder (34) installed on the above-mentioned mounted surface (108), and the above-mentioned crankcase (26) is provided with a discharge side oil passage (111), the discharge One end of the side oil passage (111) opens toward the mounted surface (108) and communicates with the other end of the discharge passage (110), and the oil passage (111) guides oil to the cylinder head (27) side. 3. The engine lubricating device as claimed in claim 2, characterized in that, in order to clean the oil sucked from the bottom of the crankcase (26), an oil filter ( 81), the crankcase (26) is provided with a suction side oil passage (117), one end of the suction side oil passage (117) communicates with the oil filter (81), and the other end faces the above-mentioned installed surface (108) Opening; a suction passage (116) is provided on the above-mentioned holding seat (34), and one end of the suction passage (116) opens to the above-mentioned mounting surface (109) of the holding seat (34) and connects with the suction side oil passage (117) The other end communicates, and the other end of the suction path (116) communicates with the suction port (106) of the oil pump (82).

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