CN1311387A

CN1311387A - Oil pump allocation structure for 4-circulation engine

Info

Publication number: CN1311387A
Application number: CN01103324A
Authority: CN
Inventors: 奈良一弘; 太箸树巨雄
Original assignee: Yamaha Motor Co Ltd
Current assignee: Yamaha Motor Co Ltd
Priority date: 2000-02-29
Filing date: 2001-01-31
Publication date: 2001-09-05
Anticipated expiration: 2021-01-31
Also published as: MY128203A; EP1130236A3; ID29369A; CN1230605C; EP1130236A2; TW515768B; JP2001241310A; ES2292502T3; EP1130236B1

Abstract

To provide an oil pump arranging structure of a four cycle engine capable of reducing costs by sharing a pump main body with a plural kinds of engines as well as using a gear driving type oil pump of low costs, and capable of forming the engine in a small and compact size 4 by contracting the width of the engine. The oil pump 32 is disposed on the same line as a crank journal bearing 27 in a crankshaft direction, a gear 36 attached to a pump shaft 35 and a gear 39 attached to a crankshaft 7 are engaged with each other, and rotation of the crankshaft 7 is transmitted to the pump shaft 35 through the gears 39, 36. It is thus possible to form the engine in a small and compact size by contracting the width of the engine. It is thus possible to share the pump main body 33 with the engine having a plurality of engine displacements by using the gear driving type oil pump 32 of low costs and by changing an oil delivery amount by means of selection of a gear ratio, and thereby, cost is reduced.

Description

The oil pump allocation structure of 4 cycle engines

The present invention relates to a kind of oil pump allocation structure of 4 cycle engines.

In 4 cycle engines that by oil each one are lubricated and cool off, oily circuit oil pump is driven by crank up, but the example of the conventional art of the configuration structure of the swing oil pump for engine of combination that carries on the small-sized two-wheeled motorcycle respectively as shown in Figures 3 and 4.

Be that Fig. 5 and Fig. 6 are the sectional view of the crankshaft end of 4 cycle engines, in configuration structure shown in Figure 5, the structure that adopts is that the oil pump 132 that is installed in the crankcase 103 is offset to the configuration of crankshaft direction foreign side with respect to crankshaft journal bearing 127, the gear 136 that is installed on its pump shaft 135 ends directly meshes with the gear 139 that is installed on the bent axle 107, and the revolution of bent axle 107 is delivered on the pump shaft 135 with turning axle 135 by gear 139,136.

In addition, in configuration structure shown in Figure 6, the structure that adopts is that the oil pump 232 that is installed in the crankcase 203 roughly disposes at crankshaft direction side by side with respect to crankshaft journal bearing 227, be installed on the sprocket wheel 236 of its pump shaft 235 ends and be installed on that package has annular link chain 240 between the sprocket wheel 239 on the bent axle 207, the revolution of bent axle 207 is delivered on the pump shaft 235 by sprocket wheel 239, chain 240 and sprocket wheel 236, and revolution drives this axle 235.

But, in configuration structure shown in Figure 5, for the oil drain quantity that guarantees that oil pump 132 is required, gear 136,139 needs certain gear ratio, therefore oil pump 132 and 107 on bent axle apart from being determined naturally, oil pump 132 can not radially remotely dispose with bent axle 107, for avoiding the interference of this oil pump 132 and crankshaft journal bearing 127, need relative as previously mentioned crankshaft journal bearing 127 to be configured in and be offset to crankshaft direction foreign side, therefore the width of motor strengthens, and has and can not realize problem small-sized, compactness.

In configuration structure in the past shown in Figure 6, can more freely select the reverse side of this advantage in configuration with oil pump 232, because two sprocket wheels 236,239 are disposed on the same plane, oil pump 232 radially must far leave configuration with respect to bent axle 207, the radial dimension of motor strengthens, and has and can not realize problem small-sized, compactness.

In view of above problem, the purpose of this invention is to provide a kind of when using gear drive type oil pump at a low price, can reduce cost with respect to the motor of multiple class is general by making the pump body, dwindle the width of motor, realize the oil pump allocation structure of 4 cycle engines of small-sized, the compactness of motor.

To achieve these goals, being characterized as of technological scheme 1 described invention, have the same column setting on crankshaft direction of oil pump and crankshaft journal bearing, be installed on gear and the gear engagement that is installed on the bent axle on the pump shaft simultaneously, the revolution of bent axle is delivered to the structure of aforementioned pump shaft by aforesaid gears.

Being characterized as in technological scheme 1 described invention of technological scheme 2 described inventions, with the part of the peripheral part of pump body as the assembling benchmark, with this pump body be disposed at the crankshaft journal bearing near.

Thereby,,, can make small-sized, the compactness of motor because the motor width has been dwindled in the same column setting on crankshaft direction with oil pump and crankshaft journal bearing according to technological scheme 1 described invention.In addition, by use gear drive type oil pump at a low price, and to select the oil drain quantity that gear recently changes oil pump, oil pump body can be general with respect to the motor of multiple air displacement, can reduce cost like this.

In addition, according to technological scheme 2 described inventions since with the part of oil pump body peripheral part as the assembling benchmark, with this pump body be disposed at the crankshaft journal bearing near, dwindled the radial dimension of motor, can make more small-sized, the compactness of this motor.

As mentioned above, according to the present invention, owing to adopt oil pump and the same column setting on crankshaft direction of crankshaft journal bearing, be installed on gear and the gear engagement that is installed on the bent axle on the pump shaft simultaneously, the revolution of bent axle is delivered to the structure of aforementioned pump shaft by aforesaid gears, can be when using gear drive type oil pump at a low price, and the pump body can reduce cost with respect to the motor of multiple class is general, can access the width that reduces motor, realize the effect of small-sized, the compactness of motor.

Fig. 1 is the vertical view cutaway drawing of the swing motor of combination.

Fig. 2 is the vertical view cutaway drawing of the 4 cycle engines part of the swing motor of combination.

Fig. 3 is the side view cutaway drawing of the 4 cycle engines part of the swing motor of combination.

Fig. 4 is the sectional view of crankshaft end that shows 4 cycle engines of oil pump allocation structure of the present invention.

Fig. 5 is the sectional view of crankshaft end that shows 4 cycle engines of oil pump allocation structure in the past.

Fig. 6 is the sectional view of crankshaft end that shows 4 cycle engines of oil pump allocation structure in the past.

Below with reference to the accompanying drawings embodiments of the invention are described.

Fig. 1 is the vertical view cutaway drawing of the swing motor of combination, Fig. 2 is the vertical view cutaway drawing of the 4 cycle engines part of the same swing motor of combination, Fig. 3 is the sectional view of same 4 cycle engines part, and Fig. 4 is the sectional view of crankshaft end that shows 4 cycle engines of oil pump allocation structure of the present invention.

The swing motor 10 of combination shown in Fig. 1 is equipped on the not shown small-sized two-wheeled motorcycle, and it is assembled into the assembly that constitutes in the crankcase 3 compactly for forced air cooling type 4 cycle engines (hereinafter to be referred as motor) 1 that will have oil pump allocation structure of the present invention, the driving mechanism that contains vee-belt formula automatic transimission 2 etc.

Describe in this general configuration aforementioned motor 1.

Motor 1 is a single-cylinder engine, forms single cylinder 5 as shown in Figure 3 on the cylinder body 4 that is provided with towards car body the place ahead of small-sized two-wheeled motorcycle approximate horizontal, can be embedded with piston 6 in this cylinder 5 with being free to slide.And, piston 6 by connecting rod 8 be connected in be arranged on the overall width direction can free rotating bent axle 7 on.

In addition, be formed with suction port 10 and relief opening 11 up and down respectively what be placed on cylinder cap 9 on the above-mentioned cylinder body 4, these suction ports 10 and relief opening 11 are opened and closed at reasonable time respectively by suction valve 12 and outlet valve 13, carry out required gas exchange thus in cylinder 5.

That is, as shown in Figure 3, suction valve 12 can be inserted logical the maintenance respectively by the valve guide 14,15 that is pressed into cylinder cap 9 with outlet valve 13 with being free to slide, and they are depended on to closing side by spring 16,17, and each end of each top and rocking arm 18,19 joins.Here, the intermediate portion of each rocking arm 18,19 by axle 20,21 can freely swing the ground pivotal support, their the other end contacts with cam on being integrally formed in camshaft 22.

As shown in Figure 1, on an end of aforementioned camshaft 22, sprocket wheel 23 is installed, this sprocket wheel 23 and be installed on the cam chain 25 that package between the sprocket wheel 24 of intermediate portion of aforementioned bent axle 7 has annular.

The revolution of bent axle 7 is passed on the camshaft 22 through sprocket wheel 24 and cam chain 25 and sprocket wheel 23, when this camshaft 22 is turned round driving with specific speed (1/2 speed of bent axle 7), by rocking arm 18,19 suction valve 12 and outlet valve 13 are driven respectively, and suction port 10 and relief opening 11 open and close at reasonable time respectively, thus as previously mentioned, in cylinder 5, carry out required gas exchange.

As shown in Figure 1, spiral is connected with spark plug 26 on the aforementioned cylinder cap 9,, the electrode part of this spark plug 26 is near the firing chamber S that is formed on the cylinder cap 9.

On the other hand, as among Fig. 2 in detail as described in, aforementioned bent axle 7 can support freely to rotate by the crankshaft journal bearing 27 of pairing left and right, on the one end (right-hand member) cooling fan 28 is installed, side is provided with motor 29 within it.In addition, the drive pulley 30 that constitutes aforementioned vee-belt formula automatic transimission 2 is installed on the other end (left end) of bent axle 7.What Fig. 3 was shown specifically for another example, the top of cylinder cap 9 is equipped with the suction tude 31 that is connected on the aforementioned suction port 10, is connected with not shown Carburetor and filter cleaner on this suction tude 31.In addition, on the aforementioned relief opening 11 that is opened on cylinder cap 9 bottoms, not shown outlet pipe is installed, on this outlet pipe, is connected with not shown muffler.

In 4 cycle engines 1, make oil circulation by oil pump shown in Figure 4 32, cooling and lubricated each one below describe the configuration structure of this oil pump 32 according to Fig. 4.

Oil pump 32 is the trochoid pump by the gear drive type of bent axle 7 drivings, the structure of this oil pump 32 is for having taken in gear 34 in pump body 33, logical insert the pump shaft 35 of supporting this gear 34 from the end that pump body 33 stretches out, large diameter gear 36 is installed, and the structure of pump body 33 is for covering sheetmetal 33b on the body part 33a of die casting manufacturing with screw 37.

Pump body 33 with oil pump 32 of said structure is installed on the crankcase 3 by not shown screw, but it and a side's (right-hand) crankshaft journal bearing 27 is provided with at the crankshaft direction same column.

When this oil pump 32 is installed on crankcase 3, with the part of pump body 33 peripheral parts as the assembling benchmark, with this pump body 33 be arranged at aforementioned crankshaft journal bearing 27 near.Promptly, an outstanding part that contacts the sheetmetal 33b peripheral part that pump body 33 is arranged on the 3a of shaft shoulder portion of the support part of support crankshaft journal bearing 27 in crankcase 3, with this pump body 33 location, in this state pump body 33 be installed on by not shown bolt crankcase 3 crankshaft journal bearing 27 near.

On the other hand, closely be close to the gear 39 that minor diameter is installed, aforesaid gears 36 engagements of this gear 39 and oil pump 32 at the crankshaft journal bearing 27 of bent axle 7.

Have above structure motor 1 integral body as shown in Figures 1 and 2, cover by resinous guard shield 40, in this guard shield 40 relative with aforementioned cooling fan 28 to the position on be formed with the cooling air introducing port 40a of circular hole coaxially with bent axle axle 7.In addition, as shown in Figure 2, form consent 40b to oblique side opening at the front end of engine hood 40, the side is formed with the circular hole 40c that confirms that upper dead center is used thereafter.And, being inserted with aforementioned spark plug 26 on the consent 40b as shown in Figure 1, this spark plug 26 is covered by the gag 41 that embeds consent 40 from the outside, and releasably embedding on the circular hole 40c of aforementioned upper dead center affirmation usefulness has serum cap 42.And the many places of the periphery of guard shield 40 are installed on the crankcase 3 by screw 43.

Below, the structure of the driving mechanism that makes up swing motor 10 is described.

As shown in Figure 1, be parallel to each other at the rear portion of crankcase 3 and can be provided with driven shaft 4 and not shown jack shaft and output shaft (axletree) 45 freely to rotate, driven pulley 46 and centrifugal clutch 47 are installed on driven shaft 44, package has the vee-belt 48 of ring-type between driven pulley 46 and aforementioned drive pulley 30, constitutes aforementioned vee-belt formula automatic transimission 2.And, form the actuation gear 49 of minor diameter on the end (right-hand member) of driven shaft 44.

Diameter different not shown driven gear and actuation gear are installed on aforementioned jack shaft, be engaged with aforementioned actuation gear 49 in these on the driven gear of countershaft, large diameter driven gear 50 engagements of installing on the not shown actuation gear of jack shaft and the aforementioned output shaft 45.And, at the trailing wheel 51 that small-sized two-wheeled motorcycle is installed from outstanding end, the crankcase 3 outside sides of output shaft 45.In addition, in Fig. 1, the 52 recoil bars of using for kick-starter.

Below, the effect of the swing motor 10 of the combination with above structure is described.

In the swing motor 10 of combination, not shown when starting button and aforementioned recoil bar 52 ato units 1 to make bent axle 7 revolutions by operating, turn round with generator 29 with these bent axle 7 coaxial mounted cooling fans 28, the revolution of bent axle 7 simultaneously is by 2 automatic speed changings of vee-belt formula automatic transimission and be passed to centrifugal clutch 47 with being integral.At this, when the rotating speed of centrifugal clutch 47 reaches certain value combination when above, transmit revolution to driven shaft 44, the revolution of driven shaft 44 is slowed down by actuation gear 49 and the not shown driven gear that is located on the jack shaft and to the jack shaft transmission.And the revolution of jack shaft is by not shown actuation gear and driven gear 50 slows down once more and to output shaft 45 transmission, this output shaft 45 and the trailing wheel 51 that is mounted thereon are turned round, thereby small-sized two-wheeled motorcycle begins walking.

On the other hand, in motor 1, as previously mentioned, by cooling fan 28 revolutions are driven, to import in the guard shield 40 from the cooling air that is opened on the cooling air introducing port 40a on guard shield 40 sides, this cooling air flows in guard shield 40, will comprise the each several part cooling of the cylinder body 4 and the cylinder cap 9 of motor 1.

In addition, in motor 1, drive oil pump 32, make the oil circulation, supply with the lubricated and cooling of each by this oil pump 32 by bent axle 7.Promptly, the revolution of bent axle 7 is slowed down with requirement ratio through gear 36,39 and pass to the pump shaft 35 of oil pump 32, this pump shaft 35 is driven by revolution, by oil pump 32 oil suctions, the oil that rises to specified pressure by oil pump 32 is discharged from oil pump 32, and is lubricated and cool off to each one.

As mentioned above, in the present embodiment, as mentioned above,, can make motor 1 small-sized, compactness because crankshaft journal bearing 27 same column setting on crankshaft direction of an oil pump 32 and a side has reduced the motor width.

In addition, owing to use economic gear drive type oil pump 32, can reduce the cost of motor 1.And if pass through the oil drain quantity of the gear ratio of selected gear 36,39 with change oil pump 32, then the pump body 33 of oil pump 32 can be general with respect to the motor of multiple air displacement, can further reduce cost like this.

Moreover, in the present embodiment, since with the part (part of sheetmetal 33b periphery) of the peripheral part of the pump body 33 of oil pump 32 as assembling benchmark, with this pump body 33 be disposed at crankshaft journal bearing 27 near, dwindled the radial dimension of motor 1, can make this motor 1 more small-sized, compactness.

Claims

1, a kind of oil pump allocation structure of 4 cycle engines, it is characterized by, have the same column setting on crankshaft direction of oil pump and crankshaft journal bearing, be installed on gear and the gear engagement that is installed on the bent axle on the pump shaft simultaneously, the revolution of bent axle is by the structure of described gear transmission to described pump shaft.

2, according to the oil pump allocation structure of described 4 cycle engines of claim 1, it is characterized by, with the part of the peripheral part of pump body as the assembling benchmark, with this pump body be disposed at described crankshaft journal bearing near.