CN105888768A

CN105888768A - Integrated swinging engine unit

Info

Publication number: CN105888768A
Application number: CN201610080598.9A
Authority: CN
Inventors: 森正树
Original assignee: Suzuki Motor Corp
Current assignee: Suzuki Motor Corp
Priority date: 2015-02-16
Filing date: 2016-02-04
Publication date: 2016-08-24
Anticipated expiration: 2036-02-04
Also published as: JP6443108B2; JP2016151193A; DE102016001225B4; DE102016001225A1; CN105888768B

Abstract

The invention aims at achieving the decrease of the height of a seat and the expansion of a luggage space. An integrated swinging engine unit (1) is provided with an internal combustion engine (2) with a crankshaft case (21) and an air cylinder; an oil tank (213L) for storing oil for lubricating the crankshaft case (21) and the air cylinder. The oil tank (213L) is disposed outside a crankshaft room (93) in the crankshaft case (21). The unit (1) has the following structure that the center of a crankshaft (90) in the crankshaft case (21) is located at the lower side of the center C2 of a rear axle (40).

Description

Integrated oscillating type engine unit

Technical field

The present invention relates to a kind of integrated oscillating type engine unit, particularly to a kind of entirety possessing dry sump lubrication mechanism Oscillating engine unit.

Background technology

In the past, it is proposed that a kind of engine for motorcycle unit (for example, referring to patent document 1), by storage in internal combustion engine The fuel tank that the oil of parts is lubricated is integrally provided to the rear of crankcase, and in the way of can swinging up and down together with trailing wheel At body shell, integrated oscillating type engine unit (power unit) is installed.In this engine for motorcycle unit, fuel tank is with bent Axle box is set to one, even if therefore in the case of engine unit swings, it is also possible to make oil swimmingly at crankcase and fuel tank Between flow.

Prior art literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2006-44438 publication

But, in the engine for motorcycle unit described in patent document 1, from crankcase connection to fuel tank the 1st oil lead to Road, it is configured at the lower side of bent axle from the fuel tank connection oily path etc. to the 2nd of oil pump and oil strainer the.Therefore, it is configured at song Bent axle in axle box is configured at the height roughly the same with the hind axle that engine for motorcycle unit is supported from side when observing.

On the other hand, in the motorcycle possessing integrated oscillating type engine unit, it is desirable to make to be configured at the top of engine unit The height (height of seat) of seat reduce, and require to expand the capacity of the luggage space in the space utilizing under-seat side. In order to tackle such requirement, the layout of engine unit periphery is made an effort.But, by the layout of engine unit periphery And the capacity expansion of the reduction of the height of seat brought and luggage space has certain limit.Therefore, general internal combustion engine is being used Structure in the case of, carry out the reduction of further height of seat and the appearance of luggage space by the layout of engine unit periphery Amount expands more difficult.

Summary of the invention

The present invention proposes in view of such actual conditions, its object is to provide a kind of reduction being capable of height of seat Integrated oscillating type engine unit with the capacity expansion of luggage space.

For solving the means of problem

The integrated oscillating type engine unit of the present invention possesses: internal combustion engine, has crankcase and cylinder；And fuel tank, storage is used for Lubricating the oil of the parts of described crankcase and cylinder interior, this integrated oscillating type engine unit is characterised by, described fuel tank is joined The outside of the crankshaft room being placed in described crankcase, and in described engine unit, it is configured at the bent axle in described crankcase Center configuration in the downside at the center of hind axle.

According to this structure, fuel tank is configured at the outside of crankshaft room, and the center configuration of bent axle is in the downside of the central shaft of trailing wheel, because of This can not be reduced the position of crankcase by restricting in the layout of fuel tank.Thus, with the center configuration of bent axle in trailing wheel The conventional integrated oscillating type engine unit of the roughly the same height of central shaft is compared, it is possible to the upper side at crankcase forms space, Therefore, it is possible to reduce the height of the seat of the top being configured at engine unit, and expand the row in the space utilizing under-seat side The capacity in Lee space.It addition, by the position reducing bent axle, it is possible to reduce the center of gravity of internal combustion engine, therefore, it is possible to improve vehicle Riding stability.

Such as, in the integrated oscillating type engine unit of the present invention, described crankcase is by divided a pair on overall width direction Box part is constituted, and described fuel tank is configured at the rear side of the box part of a side.In this case, due to only at the box part of a side Rear side configuration fuel tank, therefore, it is possible to reduce the space needed for the configuration of fuel tank, therefore, it is possible to reduce to engine unit periphery The impact of layout of structure member.

It addition, in the integrated oscillating type engine unit of the present invention, it is preferred that viewed from above, the case portion of one Part has: portion of crankshaft room, and it has been internally formed described crankshaft room；And extension, it is in the overall width side of the box part of one Extend to rear side laterally from portion of described crankshaft room, described fuel tank is configured at the connecting portion in portion of described crankshaft room and described extension The corner divided.In this case, the portion of crankshaft room in the box part of a side configures fuel tank with the corner of the coupling part of extension, Therefore, it is possible to apply flexibly the space easily becoming dead band to configure fuel tank.

Especially, in the integrated oscillating type engine unit of the present invention, it is preferred that described fuel tank and the case portion of one Part is set to one.In this case, it is possible to omit and connect the oil pipe of crankshaft room to crankcase from fuel tank, and can shorten from Fuel tank is to the oily path of the lubricant housings in crankcase, cylinder.

Additionally, in the integrated oscillating type engine unit of the present invention, it is preferred that there is scavenge oil pump and the oil transfer pump of pressure oil, Described scavenge oil pump and oil transfer pump are configured to before and after vehicle be arranged side by side on direction in the lower side of described bent axle.In this case, Lower side at bent axle configures scavenge oil pump and oil transfer pump, therefore, it is possible to reduce the center of gravity of internal combustion engine, it is possible to improve traveling further steady Qualitative.It addition, scavenge oil pump and oil transfer pump are configured to before and after vehicle be arranged side by side on direction, therefore, it is possible to share for driving The parts of these pumps, therefore, it is possible to reduce the number of packages of the parts for driving pump.It addition, with scavenge oil pump and oil transfer pump separate configuration Situation compare, it is possible to make to be come the simplifying the structure of oily path of pressure oil by these pumps.

Especially, in the integrated oscillating type engine unit of the present invention, it is preferred that described oil transfer pump accepts from described song The revolving force of axle, and this revolving force is passed to described scavenge oil pump.In this case, it is possible to make oil transportation by the rotation of bent axle Pump and scavenge oil pump rotate, therefore, it is possible to omit the structure member that oil transfer pump and scavenge oil pump supply revolving force, it is possible to reduce components Number and manufacturing cost.

Additionally, in the integrated oscillating type engine unit of the present invention, it is preferred that connect of oily path of described fuel tank Distribution is placed in the box part of the one of described crankcase and the position including coordinating face of the box part of the opposing party.In this situation Under, a part for the oily path of connection fuel tank is arranged at the position including cooperation face of a pair box part, therefore, it is possible to passing through The casting etc. utilizing mould forms oil path when manufacturing box part, there is no need for being formed the special processing of oil path.

Such as, in the integrated oscillating type engine unit of the present invention, set at the box part of one and the box part of the opposing party It is equipped with groove portion and described groove portion to be mutually arranged as opposed to, and a part for described oil path is the case portion by combining one The box part of part and described the opposing party is formed.In this case, a pair box part is combined, thus by mutually relatively joining The groove portion put forms a part for oil path, therefore, it is possible to make the sectional area of oil path become big, it is possible to increase to crankcase and gas The greasy property of the parts of cylinder interior.

Invention effect

In accordance with the invention it is possible to realize the reduction of height of seat and the capacity expansion of luggage space.

Accompanying drawing explanation

Fig. 1 is the partial side view of the motorcycle of the integrated oscillating type engine unit of application present embodiment.

Fig. 2 is the side view of the integrated oscillating type engine unit of present embodiment.

Fig. 3 is the side view of the integrated oscillating type engine unit of present embodiment.

Fig. 4 is the schematic diagram for illustrating the internal structure of the integrated oscillating type engine unit of present embodiment.

Fig. 5 is the top view of the integrated oscillating type engine unit of present embodiment.

Fig. 6 is the side view of the left side case that the integrated oscillating type engine unit of present embodiment is had.

Fig. 7 is the side view of the left side case that the integrated oscillating type engine unit of present embodiment is had.

Fig. 8 is the side view of the right side case that the integrated oscillating type engine unit of present embodiment is had.

Fig. 9 is the side view of the right side case that the integrated oscillating type engine unit of present embodiment is had.

Figure 10 is the top view of the crankcase that the integrated oscillating type engine unit of present embodiment is had.

Figure 11 is the partial side view of the motorcycle of the integrated oscillating type engine unit of application reference example.

Symbol description

1 integrated oscillating type engine unit (engine unit)

2 internal combustion engines

21 crankcases

Case on the left of 21L

Case on the right side of 21R

Portion of 211L, 211R crankshaft room

212L band room portion

213L fuel tank

214 oil strainers

22 cylinder block

23 cylinder head

24 valve mechanism cover

3 speed changers

31 V variable v-belt drives

32 transmission case

4 trailing wheels

40 hind axles

5 air purifiers

6 throttle body

7 seats

8 luggage cases

90 bent axles

91 pistons

91a piston pin

93 crankshaft room

The center of C1 bent axle

The center of C2 hind axle

The center of C3 piston pin

OP1～OP6 oil path

Detailed description of the invention

Hereinafter, referring to the drawings embodiments of the present invention are described in detail.It addition, it is following to by the Integral swinging of the present invention Formula engine unit is applied to the situation of motorcycle and illustrates.But, about the vehicle of the application present invention, it is not limited to motor Car and can suitably change.Such as, it is also possible to be applied to automatic tricycle, automobile.

Fig. 1 is the partial side view of the motorcycle of the integrated oscillating type engine unit of application present embodiment.In FIG, show Go out the situation applying integrated oscillating type engine unit in motor scooter, but be not limited to this.It addition, in FIG, Illustrate only the structure member of a part for integrated oscillating type engine unit periphery.It addition, in the following description, respectively with Arrow FR represents vehicle front, represents rear view of vehicle with arrow RE, represents vehicle left side with arrow L, represents car with arrow R Right side.

As it is shown in figure 1, integrated oscillating type engine unit (following, to be suitably termed as " engine unit ") 1 is configured at vehicle Lower side and the position that offsets rearward from vehicle central.Engine unit 1 can swingingly be supported in the vertical direction Not shown body shell.Engine unit 1 is configured to internal combustion engine 2 and the speed changer 3 one possessing dry sump lubrication mechanism Body.Internal combustion engine 2 is such as made up of four-stroke cycle single cylinder air-cooled internal combustion engine.Speed changer 3 is such as configured to comprise V belt Buncher 31 and transmission case 32 (about V variable v-belt drive 31, with reference to Fig. 4).A part for internal combustion engine 2 is (more Specifically, for left side case 21L described later) near rearward end, support the trailing wheel 4 accepting driving force via speed changer 3.

It is provided above air purifier 5 and throttle body 6 at engine unit 1.These air purifiers 5 and throttling Valve body 6 is installed on engine unit 1 via bracket, is configured to together with engine unit 1 swing.Air purifier 5 By built-in air cleaner, the outer gas sucked in motion is purified, and be supplied to throttle body 6.

Throttle body 6 is connected to air purifier 5 via connecting tube 61.Throttle body 6 possesses not shown joint in inside Stream valve.Throttle body 6 adjusts the open and-shut mode of choke valve according to the opening and closing operations of the throttle of driver, thus controls from sky The air capacity that internal combustion engine 2 (more specifically, for the combustion chamber in internal combustion engine 2) is supplied by gas purifier 5 side.

Seat 7 and luggage case 8 that driver takes a seat it is configured with above these air purifiers 5 and throttle body 6.Seat Chair 7 is installed on support 81, and this support 81 is arranged on above the front surface part of luggage case 8.Seat 7 is mounted to The upper and lower opening and closing of rear end portion side is made with support 81 as rotating fulcrum.

Luggage case 8 is configured at the inside of not shown exterior member, and this exterior member is arranged in the lower side of seat 7.Luggage case 8 shapes with side opening up.Constitute as follows: at the shape opening seat 7 with support 81 as rotating fulcrum Under state, it is possible to house the luggage such as the helmet at luggage case 8.

Here, the structure of the engine unit 1 of present embodiment is illustrated with reference to Fig. 2～Fig. 4.Fig. 2 and Fig. 3 is this The side view of the engine unit 1 of embodiment.Fig. 4 is for entering the internal structure of the engine unit 1 of present embodiment The schematic diagram of row explanation.It addition, in fig. 2, engine unit 1 is represented from the side, left of vehicle, in figure 3, from vehicle Side, right represent engine unit 1.

As shown in Figures 2 and 3, engine unit 1 is made up of internal combustion engine 2 and speed changer 3.Internal combustion engine 2 is configured to comprise song Axle box 21, cylinder block 22, cylinder head 23 and valve mechanism cover 24.Cylinder block 22 is incorporated into the leading section of crankcase 21.Cylinder Lid 23 is incorporated into the leading section of cylinder block 22.Valve mechanism cover 24 is incorporated into the leading section of cylinder head 23.Speed changer 3 is configured to Comprise the transmission case 32 being incorporated into crankcase 21 and the V variable v-belt drive 31 being contained in transmission case 32 (about V Variable v-belt drive 31, with reference to Fig. 4).

In the inside of engine unit 1, as shown in Figure 4, bent axle 90 can rotate the earth's axis and is supported in crankcase 21.At gas Cylinder-bore 221 it is formed with in cylinder body 22.Piston 91 can be configured at this cylinder-bore 221 slidably.The two ends of connecting rod 92 are respectively Bent axle 90 and piston 91 can be linked to rotatably via crank-pin 90a, piston pin 91a.Reciprocal by piston 91, from And make bent axle 90 be driven in rotation in crankshaft room 93.

The driving pulley 31a of V variable v-belt drive 31 it is provided with at bent axle 90.Bent axle 90 constitutes V variable v-belt drive The drive shaft of 31.The driven shaft 31b of V variable v-belt drive 31 can rotate the earth's axis and be supported on transmission case 32.This from Moving axis 31b is provided with the follow-up pulley 31c of V variable v-belt drive 31 via not shown centrifugal clutch.Annular V band 31d It is set up in these and drives pulley 31a and follow-up pulley 31c.

It is formed with driven shaft little gear 31e at the driven shaft 31b of V variable v-belt drive 31.This driven shaft little gear 31e with Idler gear 31f engages.Further, this idler gear 31f engages with the rear wheel gear 41 being arranged at hind axle 40.Trailing wheel 4 It is incorporated into hind axle 40 (with reference to Fig. 1) integratedly.

Rearward end in cylinder head 23 is formed with combustion chamber 94.It is formed on the top of cylinder head 23 and is connected to combustion chamber 94 Air inlet 95.On the other hand, the bottom in cylinder head 23 is formed with the exhaust outlet 96 being connected to combustion chamber 94.It addition, at gas Cylinder cap 23 is provided with intake valve 97 and the combustion chamber of opening and closing exhaust outlet 96 of the opening portion of the side, combustion chamber 94 of opening and closing air inlet 95 The air bleeding valve 98 of the opening portion of 94 sides.

Throttle body 6 (with reference to Fig. 1) is had via not shown air inlet pipe connection at air inlet 95.At exhaust outlet 96 via not The blast pipe of diagram connects silencer.Valve train room 99 it is formed with between cylinder head 23 and valve mechanism cover 24.It is configured at Intake valve 97 and air bleeding valve 98 in cylinder head 23 are filled by the not shown valve train being configured in this valve train room 99 Put and be opened and closed driving.

As shown in Figure 4, in engine unit 1, the center C1 of the bent axle 90 being configured in crankcase 21 is when side is observed It is configured at the lower side of the center C2 of hind axle 40.It addition, the center C1 of bent axle 90 is configured at piston pin when observing in side The lower side of the center C3 of 91a.

Fig. 5 is the top view of the engine unit of present embodiment.As it is shown in figure 5, crankcase 21 is divided by overall width direction The pair of right and left box part cut is constituted.Hereinafter, the box part being configured at side, left is referred to as left side case 21L, right will be configured at The box part of side is referred to as right side case 21R.Left side case 21L substantially has the shape at right side opening, and right side case 21R has The shape (with reference to Fig. 7, Fig. 9) of left side opening.Crankcase 21 is by engaging the end of the side, right of case 21L on the left of (combination) Face is formed with the end face of the side, left of right side case 21R.By by left side case 21L and the joint of right side case 21R in internal shape The space become constitutes crankshaft room 93 described later.

Left side case 21L has at the crankshaft room portion 211L of internal rules crankshaft room 93 with in the overall width direction of this crankshaft room portion 211L Outside (side, left) extends to band room portion (extension) 212L of rear side from crankshaft room portion 211L, and viewed from above substantially have There is L-shaped.It addition, these crankshaft room portion 211L and band room portion 212L is set to one.

It addition, be provided with fuel tank 213L at left side case 21L.Viewed from above, the cross section of fuel tank 213L has the case of triangle Shape.Fuel tank 213L is arranged at the corner of the coupling part of crankshaft room portion 211L and band room portion 212L.That is, fuel tank 213L is only It is arranged at outside and the rear side of left side case 21L of crankshaft room 93.Additionally, fuel tank 213L and these crankshaft room portion 211L and band Room portion 212L is set to one.

By the most only at the rear side configuration fuel tank 213L of left side case 21L, it is possible to reduce the sky needed for the configuration of fuel tank 213L Between, it is possible to reduce the impact of the layout of the structure member on engine unit 1 periphery.Further, since at the song of left side case 21L The corner configuration fuel tank 213L of the coupling part of axle room portion 211L and band room portion 212L, easily becomes dead therefore, it is possible to effectively utilize The space in district.Additionally, by fuel tank 213L and crankshaft room portion 211L and band room portion 212L is set to one such that it is able to save The oil pipe slightly connected to the crankshaft room 93 of crankcase 21 from fuel tank 213L, and can shorten oil from fuel tank 213L force feed to song The oily path of the lubricant housings in axle box 21 and cylinder (cylinder block 22, cylinder head 23, valve mechanism cover 24).

Additionally, be provided with oil strainer 214 (with reference to Fig. 2) in the side of left side case 21L.Oil strainer 214 is removed via rear The impurity (with reference to Figure 10) of the oil of oily path OP2, OP5 supply stated.The oil eliminating impurity is used for crankcase 21 and gas The lubrication of the parts in cylinder (cylinder block 22, cylinder head 23, valve mechanism cover 24).

In the way of the opening portion of confining zone room portion 212L, the transmission case 32 being constituted speed changer 3 is installed on left side case 21L. V variable v-belt drive 31 (with reference to Fig. 4) is contained being formed at the band room portion 212L space with the inside of transmission case 32. It addition, be provided with hind axle support 215L in the side, right of the rearward end of band room portion 212L.Hind axle support 215L supports The hind axle 40 (with reference to Fig. 4) being combined integratedly with trailing wheel 4.

Case 21R is identical with left side case 21L on right side, has the crankshaft room portion 211R in internal rules crankshaft room 93.At right side case 21R is provided with oil pump 10 (Fig. 4 reference).Oil pump 10 is made up of scavenge oil pump 101 and oil transfer pump 102.Scavenge oil pump 101 plays Following effect: the oily air-breathing of the bottom surface of crankshaft room 93 will be run down into, and be sent to fuel tank 213L.Oil transfer pump 102 plays as follows Effect: the oil pressure being stored in fuel tank 213L is delivered to crankcase 21 and cylinder (cylinder block 22, cylinder head 23, valve mechanism cover 24) parts in.

These scavenge oil pumps 101 and oil transfer pump 102 are configured to before and after vehicle be arranged side by side on direction in the lower side of bent axle 90. The rotary shaft of scavenge oil pump 101 be configured at bent axle 90 slightly by rear side, the rotary shaft of oil transfer pump 102 is configured at bent axle 90 slightly Side on the front.It addition, the rotary shaft of the rotary shaft of scavenge oil pump 101 and oil transfer pump 102 is configured at roughly the same height.

Oil transfer pump 102 accepts the revolving force from bent axle 90.The revolving force accepted from bent axle 90 transmission is given back to by oil transfer pump 102 Oil pump 101.That is, if bent axle 90 rotates, then oil transfer pump 102 rotates, and scavenge oil pump 101 accepts the rotation of this oil transfer pump 102 And rotate.So, oil transfer pump 102 and scavenge oil pump 101 is made to rotate by the rotation of bent axle 90 such that it is able to it is right to omit Oil transfer pump 102 and scavenge oil pump 101 supply the structure member of revolving force, it is possible to reduce parts number of packages and manufacturing cost.

In the engine unit 1 having a structure in which, supply the gaseous mixture of the fuel to combustion chamber 94 and air by not If the igniter burning of diagram, then piston 91 moves back and forth in cylinder-bore 221.Reciprocal shifting with piston 91 Dynamic, the bent axle 90 linked via connecting rod 92 rotates.If driving pulley 31a to be rotated by the rotation of bent axle 90, then set up Rotate in the annular V band 31d driving pulley 31a and follow-up pulley 31c.The rotation of annular V band 31d is via idler gear 31f And rear wheel gear 41 and pass to hind axle 40.Then, the trailing wheel 4 being incorporated into this hind axle 40 integratedly rotates.

On the other hand, with the rotation of bent axle 90, scavenge oil pump 101 and oil transfer pump 102 rotate.By the rotation of scavenge oil pump 101, The oily air-breathing of the bottom surface of crankshaft room 93 will be run down into, and be sent to fuel tank 213L.It addition, by the rotation of oil transfer pump 102, The oil being stored in fuel tank 213L is pressed in crankcase 21 and cylinder (cylinder block 22, cylinder head 23, valve mechanism cover 24) Parts.

Hereinafter, the force feed path with reference to the oil in Fig. 6～Figure 10 engine unit 1 to present embodiment illustrates.It addition, In Fig. 6～Figure 10, it is illustrated by the broken lines the oily path of the inside being formed at crankcase 21 (left side case 21L and right side case 21R).

Fig. 6 and Fig. 7 is the side view of the left side case 21L that the engine unit 1 of present embodiment is had.In figure 6, from Case 21L on the left of the expression of outside (side, left), in the figure 7, case 21L on the left of inner side (side, right) represents.Fig. 8 and Fig. 9 It it is the side view of the right side case 21R that the engine unit 1 of present embodiment is had.In fig. 8, from outside (side, right) Case 21R on the right side of expression, in fig .9, case 21R on the right side of inner side (side, left) represents.Figure 10 is starting of present embodiment The top view of the crankcase 21 that machine unit 1 is had.

As shown in FIG. 6 and 7, the oily path OP1 connected from fuel tank 213L it is formed with to oil transfer pump 102 at left side case 21L. As shown in Figure 10, oil path OP1 is set as groove portion: on the composition surface relative with right side case 21R of left side case 21L, Near the bottom of fuel tank 213L, forwards side extends.Oil path OP1 is configured to and the oily path of right side case 21R described later OP4 is relative.

It addition, the front side at left side case 21L is formed with the oily path OP2 for being communicated to oil strainer 214 from oil transfer pump 101. As shown in Figure 10, oil path OP2 is formed as: extend from the side to the left, composition surface relative with right side case 21R of left side case 21L, And forwards side extends near the central authorities of left side case 21L.The leading section of oil path OP2 is connected to oil strainer 214.

Additionally, the rear side at left side case 21L is formed for connecting the oily path OP3 to fuel tank 213L from scavenge oil pump 101. As shown in Figure 10, oil path OP3 is formed as: extend from the side to the left, composition surface relative with right side case 21R of left side case 21L, And extend upward near the bottom of left side case 21L.The oily path OP31 constituting oil path OP3 is formed as at fuel tank The lower side of 213L extends along overall width direction.The oily path OP32 constituting oil path OP3 is formed as prolonging in the outside of fuel tank 213L Reach near the upper end of fuel tank 213L.The upper end of oil path OP32 is connected to the oily supply hole being formed on fuel tank 213L OH (with reference to Fig. 7).

As can be seen from figures 8 and 9, it is formed from fuel tank 213L connection to the oily path OP4 of oil transfer pump 102 at right side case 21R. As shown in Figure 10, oil path OP4 is set and is set as groove portion: at the joint relative with left side case 21L of right side case 21R On face, near the bottom of fuel tank 213L, forwards side extends.Oil path OP4 is configured to and the oily path of left side case 21L OP1 is relative.Oil path OP4 is formed as the right lateral bend of the case 21R to the right in its leading section, and is connected to oil transfer pump 102.

It addition, be formed with the oily path OP5 being communicated to oil strainer 214 from oil transfer pump 102 at the front side of right side case 21R. As shown in Figure 10, oil path OP5 is formed as extending from the side, composition surface of oil transfer pump 102 case 21L to the left.Oil path OP5's Leading section (left part) is connected to the oily path OP2 of left side case 21L.

Connect to fuel tank via scavenge oil pump 101 additionally, be formed at the rear side of right side case 21R from the bottom surface sections of crankshaft room 93 The oily path OP6 of 213L.Oil path OP6 is by being formed as vertically extending oily path OP61 and being formed as from scavenge oil pump The 101 oily path OP62 extended to the side, composition surface relative to left side case 21L constitute (with reference to Figure 10).Under oil path OP61 End also opening relative with the bottom surface of crankshaft room 93.

As it has been described above, if making bent axle 90 rotate by the burning of the blender in combustion chamber 94, scavenge oil pump 101 is via oil transportation Pump 102 and rotate.By the rotation of scavenge oil pump 101, the bottom from oil path OP61 is run down into the bottom surface of crankshaft room 93 Oil picks up.The oil picked up from the bottom of oil path OP61 is sent to oil path OP3 via oil path OP62, through oil Supply hole OH supplies to fuel tank 213L.

On the other hand, oil transfer pump 102 is rotated by the rotation of bent axle 90.By the rotation of oil transfer pump 102, make to be stored in oil The oil of case 213L is extracted to oil transfer pump 102 via oil path OP1, OP4.From the oil of fuel tank 213L extraction via oil path OP5, OP2 and be sent to oil strainer 214.Removed the impurity in oil removing by oil strainer 214 after, oil is sent to crankcase 21 and cylinder (cylinder block 22, cylinder head 23, valve mechanism cover 24) in parts.

In such engine unit 1, the oil supply of the bottom surface of crankshaft room 93 will be run down into fuel tank via scavenge oil pump 101 213L, and via oil transfer pump 102, the oil in fuel tank 213L is passed out to the lubricant housings in crankcase 21 and cylinder.Therefore, By fuel tank 213L being configured at the outside of crankshaft room 93, so that it is guaranteed that the free degree of the layout in crankshaft room 93.Further, fall The position of the low bent axle 90 being configured in crankcase 21.

That is, in the engine unit 1 of present embodiment, fuel tank 213L is configured at the outside of crankshaft room 93, and by bent axle The center C1 of 90 is configured at the downside (with reference to Fig. 1) of the center C2 of hind axle 40.Therefore, it is possible to not by the cloth of fuel tank 213L Restriction in office and reduce the position of crankcase 21.Thus, the center C1 with bent axle 90 is configured at and the center of hind axle 40 The conventional engine unit (integrated oscillating type engine unit) of the roughly the same height of C2 is compared, it is possible at crankcase 21 Upper side forms space.It, as a result, it is possible to reduce the height of the seat 7 of the top being configured at engine unit 1, expands and utilizes The capacity of the luggage case 8 in the lower side space of seat.

It addition, in the engine unit 1 of present embodiment, owing to the center C1 of bent axle 90 is configured in hind axle 40 The downside of heart C2, therefore, it is possible to reduce the center of gravity of internal combustion engine 2, therefore can improve the riding stability of vehicle.

Figure 11 is the partial side view of the motorcycle of the engine unit of application reference example.It addition, in fig. 11, for the ease of Illustrate, in addition to engine unit, the symbol that mark is identical with the engine unit 1 of present embodiment.It addition, at Figure 11 In, it is shown that the center C1 possessing bent axle 90 is configured at the engine unit of the roughly the same height of center C2 with hind axle 40 The motorcycle of 11.Additionally, in fig. 11, for convenience of description, it is shown that seat 7 and luggage case 8 are configured at and Fig. 1 The situation of the height that shown motorcycle is identical.

Comparison according to Fig. 1 Yu Figure 11 it is known that in the motorcycle of reference example, the bent axle 90 in engine unit 11 Center C1 is configured at the height roughly the same with the center C2 of hind axle 40.Therefore, the top of engine unit 11 it is installed on The choke valve 6 of side is configured at higher position.Its result, the space S 11 between luggage case 8 and choke valve 6 is reduced.

On the other hand, in the engine unit 1 of present embodiment, the center C1 of bent axle 90 is configured at the center of hind axle 40 The downside of C2.Therefore, it is possible to the choke valve 6 of the upper side being installed on engine unit 11 is configured at relatively low position.By This, compared with the motorcycle of reference example, it is possible to expand the space S 1 between luggage case 8 and choke valve 6.Thereby, it is possible to reduce The height of seat 7, and expand the capacity of the luggage case 8 in the lower side space that make use of seat 7.

It addition, in the engine unit 1 of present embodiment, scavenge oil pump 101 and oil transfer pump 102 are joined in the lower side of bent axle 90 It is set to before and after vehicle be arranged side by side on direction.Thereby, it is possible to reduce the center of gravity of internal combustion engine 2, it is possible to improve traveling further Stability.Further, owing to scavenge oil pump 101 and oil transfer pump 102 configure on direction before and after vehicle, it is used for therefore, it is possible to share Drive the parts of these pumps 101,102, therefore, it is possible to reduce the number of packages of the parts for driving these pumps 101,102.It addition, Compared with the situation of scavenge oil pump 101 and oil transfer pump 102 separate configuration, it is possible to make the oil utilizing these pumps 101,102 to carry out pressure oil Simplifying the structure of path.

Additionally, in the engine unit 1 of present embodiment, by a part of oily path OP1, OP4 of connection fuel tank 213L It is arranged at the position on the composition surface (coordinating face) comprising left side case 21L and right side case 21R.Thereby, it is possible to by utilizing mould The casting etc. of tool forms oil path OP1, OP4 when manufacturing box part (left side case 21L and right side case 21R) respectively, the most not Needs are used for being formed the special processing of these oil path (OP1, OP4).

Especially, at left side case 21L and right side case 21R, oil path OP1, OP4 are set to the groove portion being mutually arranged as opposed to, The oily path that is communicated in fuel tank 213L is formed by engaging case 21L and right side case 21R on the left of (combination).Thereby, it is possible to make The sectional area of the oily path being communicated in fuel tank 213L becomes big, it is possible to increase to crankcase 21 and cylinder (cylinder block 22, cylinder head 23, valve mechanism cover 24) greasy property of internal parts.

It addition, in the above-described embodiment, the size of each structure illustrated in accompanying drawing, shape etc. are not limited to this, it is possible to sending out Wave and suitably change in the range of the effect of the present invention.Additionally, the present invention can fit without departing from the range of its purpose When change is implemented.

Such as, in the above-described embodiment, as crankcase 21, to possessing, divided a pair box part on overall width direction is (left Side case 21L and right side case 21R) situation be illustrated.But, the structure of crankcase 21 is not limited to this and can carry out Suitably change.For example, it is also possible to possess not divided one-piece type crankcase on overall width direction.

It addition, in the above-described embodiment, fuel tank 213L is integrally provided to rear side and the portion of crankshaft room of left side case 21L 211L is illustrated with the situation in the corner of the coupling part of band room portion 212L.But, the structure of fuel tank 213L is not limited to This and can suitably change.Such as, in the case of band room portion is arranged at right side case 21R, it is also possible to be integrally provided to The same position of right side case 21R.

Additionally, fuel tank 213L is not necessarily integrated with crankcase 21, it is also possible to be configured to split the rear side of left side case 21L. Additionally, the position beyond the corner of the fuel tank 213L coupling part that can also be configured at crankshaft room portion 211L and band room portion 212L. Not there is band room portion 212L at crankcase 21 (left side case 21L) and be bonded to the situation of transmission case 32 at crankshaft room portion 211L Under, fuel tank 213L can also be configured at the position of crankshaft room portion 211L and the corner of the coupling part of transmission case 32.

Industrial applicability

The present invention has the effect of the capacity expansion being capable of the reduction of height of seat and luggage space, to having integrated oscillating type The vehicles such as the motorcycle of engine unit are useful.

Claims

1. an integrated oscillating type engine unit, possesses: internal combustion engine, has crankcase and cylinder；And fuel tank, storage is used In the oil of the parts lubricating described crankcase and cylinder interior, this integrated oscillating type engine unit is characterised by,

Described fuel tank is configured at the outside of the crankshaft room in described crankcase, and in described engine unit, is configured at institute State the center configuration of bent axle in crankcase in the downside at the center of hind axle.

Integrated oscillating type engine unit the most according to claim 1, it is characterised in that

Described crankcase is made up of a pair box part divided on overall width direction, and described fuel tank is configured at the box part of a side Rear side.

Integrated oscillating type engine unit the most according to claim 2, it is characterised in that

Viewed from above, the box part of one has: portion of crankshaft room, and it has been internally formed described crankshaft room；And extend Portion, it extends to rear side from portion of described crankshaft room outside the overall width direction of the box part of one,

Described fuel tank is configured at the corner in portion of described crankshaft room and the coupling part of described extension.

Integrated oscillating type engine unit the most according to claim 3, it is characterised in that

Described fuel tank is set to one with the box part of one.

5. according to the integrated oscillating type engine unit according to any one of claim 2 to 4, it is characterised in that

There is scavenge oil pump and the oil transfer pump of pressure oil, described scavenge oil pump and oil transfer pump be configured at car in the lower side of described bent axle It is arranged side by side on direction before and after.

Integrated oscillating type engine unit the most according to claim 5, it is characterised in that

Described oil transfer pump accepts the revolving force from described bent axle, and this revolving force is passed to described scavenge oil pump.

7. according to the integrated oscillating type engine unit according to any one of claim 2 to 4, it is characterised in that

A part for the oily path connecting described fuel tank is configured at the box part of the one of described crankcase with the opposing party's The position including cooperation face of box part.

Integrated oscillating type engine unit the most according to claim 7, it is characterised in that

The box part of one and the box part of the opposing party are provided with groove portion and described groove portion be mutually arranged as opposed to, and A part for described oil path is by combining the formation of the box part of the box part of one and described the opposing party.