JP2001082119A - Engine lubrication device - Google Patents

Abstract

(57) Abstract: In an engine lubrication system in which an oil pump that discharges oil in conjunction with rotation of a crankshaft is provided in a crankcase, an oil pump may be assembled separately from the crankcase. To be able to do
Improve oil pump assembly and maintenance. A holder for rotatably supporting a crankshaft is provided on a mounting surface of a crankcase.
The holder 34 and the cover 91 fastened to the holder 34 constitute a pump housing 90 of the oil pump 82.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for an engine in which an oil pump for discharging oil in conjunction with rotation of the crankshaft is provided in a crankcase.

[0002]

2. Description of the Related Art Conventionally, such a lubricating apparatus is already known, for example, from Japanese Utility Model Laid-Open No. 63-49292.

[0003]

However, in the prior art, the pump housing of the oil pump is composed of a crankcase and a cover attached to the crankcase, and the oil pump is mounted on the engine. In doing so, it is necessary to assemble pump components such as a rotor into the crankcase, and it is hard to say that the crankcase is excellent in assemblability and maintainability.

The present invention has been made in view of such circumstances, and enables an oil pump to be assembled separately from a crankcase, thereby improving the assemblability and maintainability of the oil pump. The purpose is to provide.

[0005]

According to a first aspect of the present invention, there is provided an oil pump for discharging oil in conjunction with rotation of a crankshaft in a crankcase. In the engine lubrication system,
A holder for rotatably supporting the crankshaft is mounted on a mounting surface of a crankcase, and a pump housing of the oil pump is constituted by the holder and a cover fastened to the holder.

According to such a configuration, it is possible to mount the oil pump on the holder mounted on the crankcase, and it is possible to mount the holder with the oil pump mounted on the crankcase. As a result, assemblability and maintainability of the oil pump can be improved.

[0007] The invention according to claim 2 provides the above-described claim 1.
In addition to the configuration of the invention described in the above, the holder has a discharge path through which one end is passed through a discharge port of the oil pump, and the other end of the discharge path is provided in a mounting surface of the holder to the mounting surface with the other end thereof opened. The crankcase is provided with a discharge-side oil passage that communicates with the other end of the discharge passage and opens one end to the mounting surface so as to guide oil toward the cylinder head. According to such a configuration, only by attaching the holder to the crankcase,
An oil passage from the oil pump to the cylinder head can be formed, and the oil passage can be easily formed.

According to a third aspect of the present invention, in addition to the configuration of the second aspect of the present invention, an oil pumped from a bottom of the crankcase is disposed at a lower portion of the crankcase so as to purify oil. A suction-side oil passage having one end communicating with the oil filter is provided in the crankcase with the other end of the suction-side oil passage opened to the surface to be attached, and communicates with the other end of the suction-side oil passage. A suction path having one end opened to the mounting surface of the holder is provided on the holder by connecting the other end of the suction path to a suction port of the oil pump. The oil passage from the bottom in the crankcase to the oil pump can be formed simply by attaching the oil passage to the crankcase, so that the oil passage can be more easily formed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on one embodiment of the present invention shown in the attached drawings.

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

First, in FIG. 1, a power unit P for driving a rear wheel WR is swingably mounted via a link 12 to a rear portion of a body frame 11 provided in a scooter type motorcycle.

Referring also to FIG. 2, the power unit P
Is an air-cooled four-cycle single-cylinder engine 14,
A continuously variable transmission 15 of a belt type extending rearward from the left side of the engine 14 to the vehicle body, and a rear wheel WR disposed behind the engine 14 is mounted on the right side of the rear end of the continuously variable transmission 15. . Further, the rear upper surface of the continuously variable transmission 15 is connected to the rear end of the vehicle body frame 11 via the rear cushion 16,
An air cleaner 17 is supported on an upper surface of the continuously variable transmission 15, a muffler 18 is supported on a right side surface of the continuously variable transmission 15, and a main stand 19 that can stand up and fall down is supported on a lower surface of the engine 14.

3 to 5, the engine 14 includes a first engine block 22 and a second engine block 23 divided by a split surface 21 extending in a vertical direction along a crankshaft 20. And
The first engine block 22 comprises a cylinder block 24 and a crankcase half 25, and a crankcase 26 for accommodating the crankshaft 20 comprises the crankcase half 25 and a second engine block 23. That is, the crankcase 26 can be divided by a plane including the rotation axis of the crankshaft 20.

A cylinder head 27 is connected to the front end of the cylinder block 24, and a head cover 28 is connected to the front end of the cylinder head 27. Cylinder block 24
Piston 3 slidably fitted to cylinder 29 provided in
0 is the connecting rod 31 and the crank pin 3
2 to the crankshaft 20.

In the crankcase half 25 of the first engine block 22, a left holder 33 and a right holder 34 are provided.
Each of the left and right crank journals 20a, 20b of the crankshaft 20 is rotatably supported by the holders 33, 34 via ball bearings 36, 37.

The continuously variable transmission 15 includes a right casing 38 and a left casing 39 which are connected to each other. A right front part of the right casing 38 is formed on a left side face of the first and second engine blocks 22 and 23. Is combined with
A reduction gear casing 40 is connected to the rear right side of the right casing 38.

A drive pulley 41 is provided at the left end of the crankshaft 20 projecting into the right casing 38 and the left casing 39. The driving pulley 41 includes a fixed pulley half 42 fixed to the crankshaft 20.
And a movable pulley half 43 that can approach and separate from the fixed pulley half 42. The movable pulley half 43 moves radially outward in accordance with an increase in the number of revolutions of the crankshaft 20. The moving centrifugal weight 44 is urged in a direction approaching the fixed pulley half 42.

A driven pulley 46 provided on an output shaft 45 supported between the rear portion of the right casing 38 and the reduction gear casing 40 is fixed to a fixed pulley half 47 supported on the output shaft 45 so as to be relatively rotatable. And a movable pulley half 48 that can approach and separate from the side pulley half 47. The movable pulley half 48 is biased toward the fixed pulley half 47 by a spring 49. A starting clutch 50 is provided between the fixed pulley half 47 and the output shaft 45. Then, the driving pulley 41 and the driven pulley 45
An endless V-belt 51 is wound therebetween.

An intermediate shaft 52 and an axle 53 parallel to the output shaft 45 are supported between the right casing 38 and the reduction gear casing 40. A reduction gear train 54 is provided between the output shaft 45, the intermediate shaft 52 and the axle 53. Provided. And an axle 5 penetrating through the reduction gear casing 40 and protruding rightward.
3 is provided with a rear wheel WR at the right end.

In such a continuously variable transmission 15, when the engine 14 rotates at a low speed, the centrifugal force acting on the centrifugal weight 44 of the drive pulley 41 is small. The groove width between the movable pulley halves 48 decreases, and the gear ratio becomes LOW.
It has become. When the rotation speed of the crankshaft 20 increases from this state, the centrifugal force acting on the centrifugal weight 44 increases, and the groove width between the fixed pulley half 42 and the movable pulley half 43 of the drive pulley 41 decreases, Accordingly, the groove width between the fixed-side pulley half 47 and the movable-side pulley half 48 of the driven pulley 46 increases, so that the gear ratio becomes LO
It changes continuously from W to TOP.

A rotor 56 of a generator 55 is connected to a right end of the crankshaft 20 protruding from the crankcase 26 on a side opposite to the continuously variable transmission 15. The stator 57 of the generator 55 is supported by the first engine block 22, and a generator cover 88 that covers the generator 55 is fastened to the first engine block 22.

A cylinder block 24 of the engine 14;
A part of the cylinder head 27 and the generator 55 are covered with a shroud 58. A louver 59 is provided on the shroud 58 at a portion corresponding to the outside of the generator 55, and a fan 60 disposed between the louver 59 and the generator cover 88 is coaxially connected to the crankshaft 20. . Thus, the fan 60 that rotates with the crankshaft 20
Is for sucking outside air from the louver 59 into the shroud 58, whereby a flow of cooling air is generated in the shroud 58 as shown by arrows in FIGS. 2 and 3, and a part of the cylinder head 27 and the cylinder block 24 is air-cooled with cooling air, and the generator 55 is air-cooled.

Communication between a combustion chamber 61 formed between the piston 30 and the cylinder head 27 slidably fitted to the cylinder 29 and an intake port 62 and an exhaust port 63 provided on the cylinder head 27; An intake valve 64 and an exhaust valve 65 for switching the shutoff are respectively urged in the valve closing direction and disposed on the cylinder head 27. The intake valve 64 and the exhaust valve 65 are opened and closed by a valve operating device 66. .

The valve gear 66 is housed in the right holder 34 for supporting the crankshaft 20 and is fixed to the crankshaft 20. The drive gear 67 is rotatably supported by the right holder 34 and is connected to the drive gear 67. A driven gear 68 that meshes with a cam 69 formed integrally with the driven gear 68
And the first rocker arm 70 on the intake side, which is supported by the right holder 34 and slidably contacts the cam 69 so as to be capable of swinging about an axis parallel to the crankshaft 20, and swinging about an axis parallel to the crankshaft 20. The first rocker arm 71 on the exhaust side, which is supported by the right holder 34 and slidably contacts the cam 69, and swings around an axis parallel to the first rocker arm 70 on the intake side, and is supported by the cylinder head 27. The second rocker arm 72 on the intake side, which is connected to and linked to the intake valve 64, and swings around an axis parallel to the first rocker arm 71 on the exhaust side, is supported by the cylinder head 27, and is linked with the exhaust valve 65. , Connected to the exhaust side second rocker arm 73
And a rod 74 connecting the first and second rocker arms 70 and 72 on the intake side, and a rod 75 connecting the first and second rocker arms 71 and 73 on the exhaust side.

The crankcase half 25 has a triangular working chamber 76 disposed on the right side of the cylinder block 24 and narrowing toward the cylinder head 27.
Are formed in the crankcase 26, and a part of the driven gear 68, the intake-side first rocker arm 70 and the exhaust-side first rocker arm 71 in the valve train 66,
A cam 69 is disposed in the working chamber 76. The rods 74 and 75 are arranged so as to intersect in an X-shape when viewed from the side, and connect between the valve operating chamber 77 formed between the cylinder head 27 and the head cover 28 and the working chamber 76. In this manner, a cylindrical cover 78 provided between the crankcase half 25 and the cylinder head 27,
The rods 74 and 75 are accommodated in 79 so as to be movable in the axial direction.

An oil reservoir 80 is formed at the bottom of the crankcase 26. The oil stored in the oil reservoir 80 is sucked into an oil pump 82 via an oil filter 81 and discharged from the oil pump 82. The supplied oil is pumped to each lubricating portion of the engine 14.

A lower part of the crankcase half 25 of the crankcase 26 is provided with a cylindrical filter chamber 83 which is open at the front surface thereof. The oil filter 81 is formed in a cup shape. A holding spring 85 for pressing the seal member 84 attached to the open end against the inner wall of the filter chamber 83 is housed in the filter chamber 83,
The opening of the filter chamber 83 is closed by a cap 86 screwed into the crankcase half 25.

An oil filter 81 is provided in the filter chamber 83.
Thereby, an unpurified chamber inside the oil filter 81 and a purifying chamber 87 outside the oil filter 81 are partitioned, and an oil reservoir 80 is communicated with the unpurified chamber.

The cap 86 also serves as a drain bolt. If the cap 86 is removed and the oil filter 81 is taken out, the oil in the oil reservoir 80 can be discharged from the filter chamber 83 to the outside.

The pump housing 90 of the oil pump 82
Is a right holder 34 and a plurality of, for example, 2
And a cover 91 fastened by two bolts 92, 92 and accommodated in a pump housing 90.
Are connected to a rotating shaft 94 rotatably supported by a pump housing 90. A driven gear 95 is fixed to an end of the rotating shaft 94 so as to protrude from the pump housing 90, and the driven gear 95 is meshed with a driving gear 67 fixed to the crankshaft 20. That is, the oil pump 82 operates in conjunction with the rotation of the crankshaft 20.

The right holder 34 includes the crankshaft 20
The outer ring of a ball bearing 37 that supports the right crank journal 20b is fitted. An oil seal 96 that slides on a drive gear 67 fixed to the crankshaft 20 on the axially outer side of the right crank journal 20b is mounted on the right holder 34, and the outer surface of the ball bearing 37 and the drive gear 67 Between the annular oil chamber 97
Is formed. In the crankshaft 20, the crank web 20 on the same side as the right crank journal 20b
c, an annular side plate 98 surrounding the right crank journal 20b is mounted on the outer surface.
An annular and flat oil reservoir 99 is formed between the side plate 98 and the crank web 20c. In addition, the outer surface of the right crank journal 20b has a plurality of oil grooves 1 communicating between the oil chamber 97 and the oil sump 99.
00 ... are provided.

A needle bearing 103 is interposed between the outer surface of the crank pin 32 and the large end 31a of the connecting rod 31.
The hollow portion 101 communicates with the oil chamber 97, and the oil hole 102 opened on the outer surface of the crank pin 32 is formed with the hollow portion 101.
The crank pin 32 is provided so as to communicate with the crank pin 32.

The oil pump 82 has first and second discharge ports 104 and 105 and one suction port 106. An oil passage 107 for connecting the first discharge port 104 to the oil chamber 97 is provided on the right side. The holder 34 is provided.

Therefore, oil discharged from the first discharge port 104 of the oil pump 82 is supplied to the oil passage 107 and the oil chamber 9.
7, oil groove 100, oil sump 99, crank pin 3
2 is fed to the hollow portion 101 and the oil injection hole 102, whereby the ball bearing 37 is lubricated, and the outer surface of the crank pin 32, the needle bearing 103, and the large end 31a of the connecting rod 31 are formed. Lubricated.

The right holder 34 is mounted on the mounting surface 108 provided on the crankcase half 25 of the crankcase 26.
In FIG. 4, a discharge path 110 for passing one end through the second discharge port 105 of the oil pump 82 is formed so that the other end of the discharge path 110 is opened on a mounting surface 109 of the right holder 34 to the mounting surface 108. Provided. On the other hand, a discharge-side oil passage 111 that guides oil toward the cylinder head 27 is provided in the crankcase half 25 of the crankcase 26. One end of the discharge-side oil passage 111 is connected to the discharge passage 110.
Is opened in the mounting surface 108 so as to communicate with the other end of the mounting surface.

The discharge-side oil passage 111 is connected to the cylinder block 2.
4 and an oil passage 112 provided in the cylinder head 27, and the oil passage 112 communicates with a flat oil reservoir 114 formed between the oil holding plate 113 attached to the head cover 28 and the head cover 28. Is done. Further, the oil holding plate 113 is provided with oil injection holes 115, 115 for jetting oil toward the oil supply side and exhaust side second rocker arms 72, 73 of the valve train 66.

Therefore, the oil discharged from the second discharge port 105 of the oil pump 82 is discharged from the discharge oil passage 110,
Discharge-side oil passage 111, oil passage 112, and oil reservoir 11
4, the oil is ejected from the oil injection holes 115, 115 toward the two rocker arms 72, 73 of the valve train 66.

The right holder 34 is provided with a suction passage 116 having one end opened to the mounting surface 109 and the other end connected to the suction port 106. On the other hand, the intake-side oil passage 11 having one end connected to the purification chamber 87 of the oil filter 81 is provided in the crankcase half 25 of the crankcase 26.
7 is provided, and the other end of the suction-side oil passage 117 is
An opening is formed in the mounting surface 108 so as to communicate with one end of the suction passage 116.

Therefore, the suction port 1 of the oil pump 82
In 06, the oil purified by the oil filter 81 is
Inhalation is performed via the suction-side oil passage 117 and the suction passage 116.

Next, the operation of this embodiment will be described. The right holder 34 for rotatably supporting the crankshaft 20 is mounted on the mounting surface 108 provided on the crankcase half 25 of the crankcase 26.
Right holder 34 and cover 91 fastened to right holder 34
Thus, the pump housing 90 of the oil pump 82 is configured. Accordingly, the oil pump 82 can be mounted on the right holder 34 side mounted on the crankcase 26, and the right holder 34 with the oil pump 82 mounted can be mounted on the crankcase 26. The assemblability and maintainability of the pump 82 can be improved.

The right holder 34 has an oil pump 82
The second discharge port 105 is provided with a discharge path 110 through which one end passes, and the other end of the discharge path 110 is connected to the mounting surface 10.
8 is opened on the mounting surface 109 of the right holder 34. On the other hand, in the crankcase half 25, a discharge-side oil passage 111 that opens one end to the mounting surface 108 so as to communicate with the other end of the discharge passage 110 is provided to guide oil toward the cylinder head 27. ing. Therefore, simply by attaching the right holder 34 to the crankcase 26, an oil passage from the oil pump 82 to the cylinder head 27 can be formed, and the oil passage can be easily formed.

Further, an oil filter 81 of the crankcase 26 is disposed so as to purify oil pumped from an oil reservoir 80 at the bottom in the crankcase 26, and suction is provided at one end to a purification chamber 87 of the oil filter 81. A side oil passage 117 is provided in the crankcase half 25 such that the other end is opened to the mounting surface 108.
Moreover, the suction passage 1 having one end opened to the mounting surface 109 of the right holder 34 so as to communicate with the other end of the suction-side oil passage 117.
16 is provided on the right holder 34 with the other end communicating with the suction port 106. Therefore, just by attaching the right holder 34 to the crankcase 26, the crankcase 2
The oil passage from the bottom in the oil pump 6 to the oil pump 82 can be configured, and the oil passage can be more easily configured.

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

[0044]

As described above, according to the first aspect of the present invention, the oil pump can be mounted on the holder side, and the holder with the oil pump mounted can be mounted on the crankcase. Therefore, the assemblability and maintainability of the oil pump can be improved.

According to the second aspect of the present invention, the oil passage from the oil pump to the cylinder head can be formed simply by attaching the holder to the crankcase, and the oil passage can be easily formed. .

Further, according to the third aspect of the present invention, the oil passage from the bottom in the crankcase to the oil pump can be formed simply by attaching the holder to the crankcase, so that the oil passage is more easily formed. can do.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 2;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 14 ... Engine 20 ... Crankshaft 26 ... Crankcase 27 ... Cylinder head 34 ... Holder 81 ... Oil filter 82 ... Oil pump 90 ... Pump housing 91 ... Cover 105 ・ ・ ・ Discharge port 106 ・ ・ ・ Suction port 108 ・ ・ ・ Attached surface 109 ・ ・ ・ Installation surface 110 ・ ・ ・ Discharge path 111 ・ ・ ・ Discharge side oil path 116 ・ ・ ・ Suction path 117 ・ ・ ・Suction side oil passage

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F02F 7/00 F02F 7/00 N 301 301F F-term (Reference) 3G013 AA02 AA04 AB02 BB04 BB19 BD07 BD09 BD24 BD42 3G015 AA02 AA04 AB02 BA03 BA05 BG01 BG08 CA06 DA02 DA11 EA05 3G024 AA46 AA48 BA23 BA29 CA19 CA23 CA24 DA03 DA16 EA04 FA00 FA07 GA40

Claims (3)

[Claims] 1. An engine lubrication system in which an oil pump (82) for discharging oil in conjunction with rotation of a crankshaft (20) is provided in a crankcase (26). A holder (34) for rotatably supporting the holder (34) is mounted on the mounting surface (108) of the crankcase (26).
And a cover (91) fastened to the holder (34) and a pump housing (90) of the oil pump (82).
A lubricating device for an engine, comprising: 2. The holder (34) has a discharge path (110) through one end of a discharge port (105) of the oil pump (82), and a discharge path (110) of the holder (34) to the mounting surface (108). The discharge path (110) is provided on the mounting surface (109).
The crankcase (26) is provided with an opening at the other end, and the crankcase (26) is provided with an opening at one end at the mounting surface (108) so as to communicate with the other end of the discharge passage (110). The lubricating device for an engine according to claim 1, characterized in that (111) is provided so as to guide oil toward the cylinder head (27). 3. An oil filter (81) disposed at a lower portion of the crankcase (26) so as to clean oil pumped from a bottom portion of the crankcase (26).
A suction-side oil passage (117) having one end communicating with the crankcase (26) is provided with the other end of the suction-side oil passage (117) opening to the mounting surface (108). A suction passage (116) having one end opened to the mounting surface (109) of the holder (34) so as to communicate with the other end of the passage (117), and the other end of the suction passage (116) is connected to the oil pump (116). The holder (34) is provided in communication with the suction port (106) of the (82).
An engine lubrication device as described.