CN1172078C - Oil return structure in engine - Google Patents

Abstract

In order to rapidly heat up oil and to return the oil from a valve system chamber to a crank chamber in a simple structure allowing avoidance of engine enlargement and weight increase, in an engine in which a cylinder head having a downwardly opened exhaust port is joined to a cylinder block having a cylinder bore tilting downwardly from the cylinder head side and a head cover forming a valve system chamber for storing a valve system mechanism between it and the cylinder is joined to the cylinder head. An oil returning passage 107 for returning the oil from the valve system chamber 79 to the crank chamber 42 in a crank case is provided in the lower part of the cylinder head 39 by surrounding a part of an exhaust port 71.

Description

Oil return structure in the motor

Technical field

The present invention relates to a kind of oil return structure that is used for the driven valve chamber of oil is turned back to crankshaft room of motor, the exhaust port of the cylinder head of this motor is under shed, this cylinder head combines with cylinder block, this cylinder block has the cylinder bore diameter of this cylinder head side as the top position earth tilt, housing forms the moving valve chamber of taking in active valve mechanism between itself and cylinder head, this housing combines with above-mentioned cylinder head.

Background technique

In the prior art, when engine start,, can shorten by the oil that lubricates usefulness the warm-up period of motor by promptly being heated up, warm-up period when making the starting of motor with heater heats oil shortens, and these technology have been opened in the flat 9-209734 communique open for example spy.

But, as above-mentioned prior art in the technology with heater heats oil owing to will consider electric power is supplied with the balance of the consumption electric power of the generator capacity of heater and heater, thereby cause the maximization of motor and weight to increase.

The present invention makes in view of above-mentioned such situation, and its objective is provides a kind of oil return structure that can make the motor that oil heats up rapidly with the simple structure that the maximization that can avoid motor and weight increase.

Summary of the invention

To achieve these goals, the oil return structure of the motor of first technological scheme of the present invention, the cylinder head of this motor makes exhaust port under shed, this cylinder head combines with cylinder block, this cylinder block has the cylinder bore diameter of this cylinder head side as the top position earth tilt, housing forms the moving valve chamber of taking in active valve mechanism between itself and cylinder head, this housing combines with above-mentioned cylinder head, it is characterized in that, crankshaft room is formed in the crankcase that combines with above-mentioned cylinder block, will be located at the bottom of cylinder head from the oil return of above-mentioned moving valve chamber round the part of above-mentioned exhaust port to the way to cycle oil of this crankshaft room.

According to the structure of the first such technological scheme, pass to the oil that driven valve chamber turns back to crankshaft room effectively by the wall portion that constitutes exhaust port from heat of exhaust.Therefore can utilize when engine cold starting temperature the heat of the exhaust port of fast rising oil is heated up, can improve the warming-up performance of motor.And because way to cycle oil is round the bottom that is located at cylinder head partially of exhaust port, the structure of the oil that therefore is used for heating up rapidly is extremely simple, with prior art with comparing that heater heats up, can realize the miniaturization and the lightweight of motor.

The oil return structure of the motor of second technological scheme of the present invention, it is characterized in that, in the oil return structure of the motor of above-mentioned first technological scheme, can open and close above-mentioned way to cycle oil open and close valve and be located on the above-mentioned cylinder head, can the path of the oil return in the above-mentioned moving valve chamber to crankshaft room's side be located on the cylinder head in the position with above-mentioned exhaust port isolation corresponding to the valve that closes of this open and close valve.According to this structure, make oil return crankshaft room's side by close way to cycle oil with open and close valve by other the path of isolating with this exhaust port, so, seldom feed through to oil from the influence of the heat of exhaust port, can prevent the overheated of oil by the switching of open and close valve.

The oil return structure of the motor of the 3rd technological scheme of the present invention, it is characterized in that, above-mentioned first or the oil return structure of the motor of second technological scheme in, form above-mentioned exhaust port agley, this exhaust port is invested projection on the plane with the axis normal of above-mentioned cylinder bore diameter becomes circular-arc at this vertical line side drum of a side direction of the vertical line at the center by the firing chamber, and this firing chamber faces with the top that is entrenched in the piston in the above-mentioned cylinder bore diameter slidably; Above-mentioned way to cycle oil is located on the above-mentioned cylinder head in the bottom of above-mentioned moving valve chamber in the lower opening of above-mentioned exhaust port.According to such structure, utilize the bending of exhaust port under the situation that does not cause cylinder head to maximize, way to cycle oil to be located on the cylinder head, and the bigger area of the periphery of exhaust hole wall portion can be applied flexibly effectively intensification in oil, even carry out the uncommon thin burning running of following owing to making the crooked vortexization that produces of exhaust port, also can remedy the warming-up reduction that its uncommon thin burning brings.

Description of drawings

Fig. 1 is two-wheeled side view.

Fig. 2 is the sectional drawing along the power unit of the 2-2 line of Fig. 1.

Fig. 3 be Fig. 2 want portion's enlarged view.

Fig. 4 has shed the 4-4 of the Fig. 3 under the state of housing to looking enlarged view.

Fig. 5 is the sectional arrangement drawing along the motor of the 5-5 line of Fig. 4.

Fig. 6 be Fig. 3 want portion's enlarged view.

Fig. 7 is the amplification sectional arrangement drawing of the thermostat under the engine cold state.

Fig. 8 is the sectional drawing corresponding with Fig. 7 under the engine warm-up done state.

Fig. 9 is the 9-9 line sectional drawing of Fig. 8.

Figure 10 is the 10-10 line sectional drawing of Fig. 8.

Embodiment

Below represented with reference to the accompanying drawings one embodiment of the invention illustrate example of the present invention.

Fig. 1～Figure 10 represents one embodiment of the invention.Fig. 1 is two-wheeled side view, Fig. 2 is the sectional drawing along the power unit of the 2-2 line of Fig. 1, Fig. 3 be Fig. 2 want portion's enlarged view, Fig. 4 has shed the 4-4 of the Fig. 3 under the state of housing to looking enlarged view, Fig. 5 is the sectional arrangement drawing along the motor of the 5-5 line of Fig. 4, Fig. 6 be Fig. 3 want portion's enlarged view, Fig. 7 is the amplification sectional arrangement drawing of the thermostat under the engine cold state, Fig. 8 is the sectional drawing corresponding with Fig. 7 under the engine warm-up done state, Fig. 9 is the 9-9 line sectional drawing of Fig. 8, and Figure 10 is the 10-10 line sectional drawing of Fig. 8.

At first in Fig. 1, the car body framework 15 of bicycle has head pipe 16 at its front end, but steering ground pivot is supporting front fork 17 on this pipe 16, and 17 of this front forks are supporting front-wheel WF.Connecting bar-shaped steering handle 18 in the upper end of this front fork 17, the front mudguard 19 that covers the top of front-wheel WF is bearing on the front fork 17.In addition, supporting back vent 20 at the intermediate portion pivot of car body framework 15,20 of this back vents are supporting trailing wheel WR, are provided with posterior bumper 21 between the rear portion of car body framework 15 and back vent 20.

Intermediate portion at car body framework 15 is supporting power unit P, and this power unit P is made of water-cooled engine E and variable-speed motor M, and the output of above-mentioned variable-speed motor M passes to trailing wheel WR by not shown chain, and this chain is covered with by chain guard 22.

In addition, the air-strainer 23 and the radiator 24 that are configured in above-mentioned motor E top are bearing on the car body framework 15, fuel tank 25 and accommodate case 26 and be bearing on the car body framework 15, this fuel tank 25 is configured in the top of variable-speed motor M, and this accommodates the top that case 26 can be accommodated electric component and is configured in above-mentioned fuel tank 25.

Guiding from the outlet pipe 27 of the exhaust of motor E be configured in power unit P and be connected with exhaust silencer 28 between trailing wheel WR.

The front portion of above-mentioned car body framework 15, motor E, air-strainer 23 and radiator 24 are covered with by the plastic leggings 29 that is installed on the car body framework 15.In addition, the rear portion of car body framework 15, fuel tank 25 and accommodate case 26 and be covered with by the plastic back cover 30 that is installed on the car body framework 15 are connecting the rear mudguard 31 that is being provided with above the rear portion that covers trailing wheel WR on this back cover 30.On this back cover 30, be provided with the vehicle seat 32 that can open and close the upper end open portion of accommodating case 26, on this vehicle seat 32, can take the driver.

Disposing windscreen 33 in the place ahead that rides in the driver on the vehicle seat 32, this windscreen 33 has transmission of light, is used to protect the driver to avoid infringements such as wind and rain.The pole 34 of pairing left and right is installed on bar-shaped steering handle 18 ... cardinal extremity, the pole 34 of this pairing left and right is bar-shaped and upward to extension, these poles 34 ... the upper end and from left and right sides wing mirror 35 ... the axial region 36 of Yan Shening downwards ... the lower end clip windscreen ground and connecting.That is the wing mirror 35 ... be installed on the steering handle 18, and windscreen 33 also is installed on the steering handle 18.

In Fig. 2～Fig. 5, the engine body 37 of water-cooled engine E is made of cylinder block 38, cylinder head 39 and crankcase 40, and above-mentioned cylinder block 38 has cylinder bore diameter 44, the chimeric slidably piston 43 of this cylinder bore diameter 44.Above-mentioned cylinder head 39 forms firing chamber 45 between the top of itself and above-mentioned piston 43, and combines with cylinder block 38.Above-mentioned crankcase 40 free rotary ground supporting bent axles 47 also combine with cylinder block 38, and this bent axle 47 is connected with above-mentioned piston 43 by connecting rod 46, and cylinder block 38, cylinder head 39 and crankcase 40 are by many 4 through bolts 41 for example ... connect.In addition, crankcase 40 constitutes by right crankcase halfbody 40a and left crankcase halfbody 40b are bonded with each other as junction plane with the plane of making rotation axis that comprises above-mentioned piston 43, forms crankshaft room 42 in crankcase 40.Engine body 37 is bearing on the car body framework 15, and will be configured in front-wheel WF tight rear cylinder head 39 as the top position make cylinder bore diameter 44 axis updip is sideling forward.

On the cylinder block 38 of above-mentioned engine body 37 and cylinder head 39, be provided with the water jacket 48 of the cooling water that is used to circulate, face 45 ground, firing chamber on cylinder head 39 a pair of ignition spark plug 49,50 is installed, this a pair of ignition spark plug is different mutually 49,50 its firing time.

Variable-speed motor M has main shaft 51, countershaft 52 and multi-stage gear row 53, this main shaft 51, countershaft 52 have the axis parallel with bent axle 47, and by crankcase 40 free rotary ground supportings, above-mentioned multi-stage gear row 53 are located between main shaft 51 and the countershaft 52, and can establish selectively, free rotary ground supporting gearshift drum 54 on crankcase 40, and this gearshift drum 54 rotates for establishing said gear row 53 selectively.

Be connected with actuation gear 56 by centrifugal clutch 55 from an end of the outstanding bent axle 47 of right crankcase halfbody 40a, with distolateral at the main shaft of giving prominence to from right crankcase halfbody 40a 51 of the driven gear 57 relative free rotary ground supportings of these actuation gear 56 engagements.Driven gear 57 is connected with the clutch Outside spare 60 of clutch 59 by damping piece 58.This clutch 59 is multi-plate clutchs, it by the effect of the tripping cam mechanism 61 corresponding with driver's operation make with main shaft 51 oncoming clutch inner pieces 62 and above-mentioned clutch Outside spare 60 between disconnect and engaging.Under the state that disconnects this clutch 59, can establish said gear row 53 selectively.Above-mentioned centrifugal clutch 55 and clutch 59 are covered with by the right side cover 63 that combines with right crankcase halfbody 40a.

Fixing driving sprocket wheel 64 from the end of the outstanding countershaft 52 of left crankcase halfbody 40b, this driving sprocket wheel 64 is covered with by chain wheel cover 22, and power is by being delivered to trailing wheel WR around the chain that hangs on this driving sprocket wheel 64.

At the rotor 66 of fixing generator 65 from the other end of the outstanding bent axle 47 of left crankcase halfbody 40b, cover the left side that these generator 65 ground combine with left crankcase halfbody 40b and cover the stator 67 of fixing generator 65 on 68.

Especially as shown in Figure 4, on cylinder head 39, be provided with suction port 70 on the top of gas lid 39 towards upper shed ground, this suction port 70 is used for to firing chamber 45 supply mixed gass.In the bottom of cylinder head 39 towards upper shed be provided with the exhaust port 71 of the exhaust that is used to eject spontaneous combustion chamber 45.On above-mentioned suction port 70, connecting air-strainer 23, on above-mentioned exhaust port 71, connecting outlet pipe 67 by not shown vaporizer.

And, suction port 70 and exhaust port 71 are in that 45 center 72 is that the position of the axis runout of cylinder bore diameter 44 is crooked to these 45 opening ground, firing chamber from the firing chamber, producing vortex in firing chamber 45, exhaust port 71 is bent to form to the circular-arc mode that these plumb line 73 sides bloat to the side (left side of Fig. 4) that the projection drawing (figure that the dotted line of Fig. 4 is represented) with the plane of the axis normal of cylinder bore diameter 44 becomes at the plumb line 73 at the center 72 by firing chamber 45 with it.

Be used to switch being communicated with the Aspirating valves 74 that cuts off and being used to switch exhaust port 71 and being provided in cylinder head 39 with the outlet valve 75 that is communicated with partition of 45 of firing chambers with can carrying out on-off action of suction port 70 and 45 of firing chambers, Aspirating valves 74 and outlet valve 75 are being suppressed to closing the valve direction by spring.

Above-mentioned Aspirating valves 74 and outlet valve 75 are by active valve mechanism 76 driven for opening and closing, and this active valve mechanism 76 is housed in the moving valve chamber 79, and this moving valve chamber 79 is formed between cylinder head 39 and the housing 78, and this housing 78 is by a plurality of bolts 77 ... be combined on this cylinder head 39.

Above-mentioned active valve mechanism 76 has camshaft 80, suction side and exhaust side pitman arm shaft 83,84, suction side rocking arm 85, exhaust side rocking arm 86.This camshaft 80 has the axis parallel with bent axle 47 and free rotary ground supporting on cylinder cap 39, and is provided with exhaust side cams 82, suction side cam 81.Above-mentioned suction side pitman arm shaft 83 and exhaust side pitman arm shaft 84 are bearing on the cylinder cap 39, and have the axis parallel with above-mentioned camshaft 80.Above-mentioned suction side rocking arm 85 can joltily supported by suction side pitman arm shaft 83, it is driven in suction side cam 81 and is used for driven for opening and closing Aspirating valves 74, and exhaust side rocking arm 86 can joltily supported by exhaust side pitman arm shaft 84 in order to be driven in exhaust side cams 82 ground driven for opening and closing outlet valves 75.

As shown in Figure 2, between the left side of crankcase 40 half crankcase halfbody 40b and generator 65, on bent axle 47, fixing driving sprocket wheel 87, in the part corresponding with this driving sprocket wheel 87, the crankshaft room 42 and the chain paths 88 between the above-mentioned moving valve chamber 79 that connect in the crankcase 40 are being set up along left crankcase halfbody 40b, cylinder block 38 and 39 of cylinder head in the position of relatively leaving from exhaust port 71.

On the other hand,, fixing by movable sprocket 89 in the end of camshaft 80 in the part corresponding with above-mentioned chain path 88, this by movable sprocket 89 and above-mentioned driving sprocket wheel 87 on around the chain 90 of hanging the ring-type that in chain path 88, can walk.

Chain 90 at above-mentioned driving sprocket wheel 87 with by movable sprocket 89 between around hanging on the idler sprockets 91 that is bearing on the cylinder block 38,87 of this idler sprockets 91 and driving sprocket wheels, give tension force by the 92 pairs of chains 90 of stretcher that are provided on the left crankcase halfbody 40b.

Special in Fig. 2 and shown in Figure 5, in the outer side surface side of right crankcase halfbody 40a oil pump 95 is installed, be located at driven gear 97 and actuation gear 98 engagements in the rotating shaft 96 of this oil pump 95, this actuation gear 98 and bent axle 47 rotate integratedly.

This oil pump 95 sucts oil from the bottom in the crankshaft room 42, the piston nozzle 99 of the oil of discharging from this oil pump 95 from the inner side surface that is installed in right crankcase halfbody 40a be to the ejection of piston 43 sides, and circulate as shown by arrows and be located in the path 100 in right crankcase halfbody 40a and the right cover 63 and supply in the bent axle 47.

In order to pass the many through bolts 41 that connect cylinder block 38, cylinder head 39 and crankcase 40 ... in, the internal diameter that is located at the through hole on cylinder block 38 and the cylinder head 39 at through bolt 41 that the bottom and the exhaust port 71 of cylinder head 39 is adjacent to be configured is being set in the mode that forms the path 102 of ring-type around above-mentioned in-and-out bolt 41.The part of the oil of discharging from oil pump 95 is supplied with above-mentioned path 102 by throttle orifice 101.In addition, on cylinder head 39, be provided with the path 104 that above-mentioned path 102 is communicated with path 103 in the camshaft 80, on each cam 81,82 of camshaft 80, be provided with and give oilhole 105,106 to the slip joint portion of cam 81,82 and each rocking arm 85,86 leading from the oil of above-mentioned path 104.

Like this, from the above-mentioned oilhole 105,106 respectively given oil is supplied with active valve mechanism 76, the oil behind the lubricated active valve mechanism 76 is imported into the bottom in the moving valve chamber 79.

Be provided with on cylinder head 39 oil in the moving valve chamber 79 is got back to the way to cycle oil 107 of crankshaft room's 42 sides, this way to cycle oil 107 is communicated with crankshaft room 42 by the way to cycle oil 108 that is located in the cylinder block 38.

And, the way to cycle oil 107 of cylinder head 39 with below the exhaust port 71 of path 102 opposition sides of above-mentioned through bolt 41 round the bottom that is located at cylinder head 39 partially of this exhaust port 71, the opening portion to moving valve chamber 79 of this way to cycle oil 107 is located at the low position of opening portion to moving valve chamber 79 than chain path 88.

In addition, the open and close valve 109 near the part of moving valve chamber 79 that can open and close above-mentioned way to cycle oil 107 is located on the cylinder head 39, this open and close valve 109 is made of the valve body 110 that for example can open and close way to cycle oil 107, the drive portion 111 that drives this valve body 110, corresponding with the situation that the temperature of oil of circulation way to cycle oil 107 becomes more than the setting temperature, drive portion 111 closes valve and drives valve body 110.

When this open and close valve 109 closes valve, remain in the oil of the bottom in the moving valve chamber 79, its oily liquid level arrive above-mentioned chain path 88 to the opening portion of moving valve chamber 79 time, turn back to crankshaft room's 42 sides from this chain path 88.In Fig. 6, water pump 11 is installed on cylinder head 39, this water pump 11 has the spin axis coaxial with the camshaft 80 of active valve mechanism 76.The pump case 116 of this water pump 115 is made of shell main body 117, installation tube 118, demarcation strip 119 and pump cover 120, this shell main body 117 is opened the opposition side with camshaft 80, this installation tube 118 combines with the open end periphery of shell main body 117, the open end of these demarcation strip 119 closed shell main bodys 117 also is entrenched in week in the open end of shell main body 117, this pump cover 120 with the open end of shell main body 117 and demarcation strip 119 is clamped in and above-mentioned installation tube 118 between.Installation tube 118 is connected with cylinder head 39.

Shell main body 117 is that the 117b of plate-like portion connects integratedly to be arranged on the open end that the 117a of round-ended cylinder portion is arranged that has sealed camshaft 80 sides and constitutes, have the 117a of round-ended cylinder portion to form cylindric and be inserted into coaxially in the driven gear 89, this driven gear 89 is fixed on the camshaft 80.

The two ends of rotating shaft 121 at the central part free rotary ground supporting of closed end central part that the 117a of round-ended cylinder portion is arranged and demarcation strip 119, a plurality of magnet 123,123 are installed in the fixed outside that is inserted in the rotor 122 in the 117a of round-ended cylinder portion integratedly rotatably with rotating shaft 121 ...In addition, on the interior week of above-mentioned driven gear 89, fixedly mounting a plurality of magnet 124,124 ..., in order to drive active valve mechanism 76, driven gear 89 rotates above-mentioned rotor 122 with rotating shaft 121 rotations with camshaft 80 rotations corresponding to this.

Forming the volute chamber 125 of using demarcation strip 119 and pump cover 121 sides to separate in the 117b of plate-like portion of above-mentioned shell main body 117, the impeller 126 that is accommodated in this volute chamber 125 is located on the rotor 122.

At the central part of demarcation strip 119, be provided with the suction port 127 that communicates with the central part of volute chamber 125 at a plurality of positions round above-mentioned rotating shaft 121 ..., from this suction port 127 ... the cooling water that sucks in the volute chamber 125 is pressurizeed by the rotation of impeller 126.Then, supply with water jacket 48 as illustrated in fig. 3 from the cooling water that water pump 115 is discharged, water jacket 48 is connected with the inlet 24a of radiator 24, be provided with thermostat 128 on the pump cover 120 of above-mentioned pump case 116, whether this thermostat 128 and the temperature of cooling water are switched accordingly with suction port 127 ... move communicatively with the outlet of radiator 24.Promptly, cooling water from radiator 24, at the low state of the temperature of this cooling water is under the cold state of motor E, cooling water from radiator 24 turns back to water jacket 48 through thermostat 128 and water pump 115, but, at the high state of the temperature of cooling water is under the warming-up done state of motor E, returns water jacket 48 from the cooling water of radiator 24 through radiator 24, thermostat 28 and water pump 115, by the heat radiation cooling cooling water of radiator 24.

With reference to Fig. 8～Fig. 9, the thermostat housing 129 of thermostat 128 forms cylindric, embedding is located at having in the end mounting hole 130 on the pump cover 120, by with the opening end of these mount inlets 130 of lid member 131 sealing between the closed end of mounting hole 130 and lid member 131 clamping land and be fixed on the pump cover 120.

And, above-mentioned mounting hole 130 be located on the pump cover 120 and have with water pump 115 in the shaft axis of impeller 126 be the axis of the axis normal of rotating shaft 121, thermostat housing 129 is configured under embedding is fixed on state in the mounting hole 130 with having the axis vertical with the shaft axis of impeller 126.

End at thermostat housing 129 is installed with the sealing component 132 that is constituted the round-ended cylinder shape by elastic material, sealing member 132 covers an end of thermostat housing 129, and an end of thermostat housing 129 is exposed to the closed end inner face central part of sealing member 132 as front end reinforcing part 133.In addition, the other end that opens wide of thermostat housing 129 docks with covering member 131, at another distolateral inner face of this thermostat housing 129 back-up ring 134 is installed.

Chimeric slidably wax shell 135 in thermostat housing 129.This wax shell 135 is made of housing main body 136 and lid 137, and the outside of this housing main body 136 directly contacts with the inner face of thermostat housing 129, and this covers 137 and combines with this housing main body 136, at housing main body 136 and cover the peripheral portion that barrier film 138 in clamping between 137.Be connected with guide cylinder 139 cylindraceous in addition on housing main body 136 integratedly, this guide cylinder 139 is entrenched in the above-mentioned sealing component 132 slidably.

Built-in wax 140 in wax shell 135, this wax 140 is filled in above-mentioned barrier film 138 and covers between 137, and barrier film 138 shrinks corresponding to the expansion that is produced by temperature variation of wax 140 and is out of shape.On the other hand, in above-mentioned guide cylinder 139 from above-mentioned barrier film 138 opposition sides chimeric slidably successively bar-shaped piston 141, discoid plate 142, rubber piston 143.Between rubber piston 143 and barrier film 138, the medium 144 that is used for the distortion of barrier film 138 is passed to above-mentioned rubber piston 143 in filling in wax shell 135.

In addition, between wax shell 135 and back-up ring 134, be provided with spring 145, this spring 145 is pressed wax shell 135 to sealing component 132 thrusters, wax shell 135 is low at cooling water temperature, when wax 140 is in contraction state and be positioned at position with sealing component 132 butts as illustrated in fig. 7.Yet, at the temperature height of cooling water, when wax 140 expands, barrier film 138 is out of shape to the left side of Fig. 8 deflection ground, piston 141 is released from guide cylinder 139, and is corresponding therewith, Yi Bian wax shell 135 one side pressure springs 145 slide to the side of leaving from sealing component 132 as illustrated in fig. 8.

With reference to Fig. 9, on the sidewall of thermostat housing 129, be provided with inlet opening 146 and the exit orifice 147 relative with this inlet opening 146, this inlet opening 146 and exit orifice 147 are configured on the diameter line of thermostat housing 129.On the other hand, on pump cover 120, be provided with the cooling water path 151 that communicates with the outlet 24b of radiator 24, thermostat housing 129 embeds and is fixed in the pump cover 120, and makes above-mentioned cooling water path 151 and above-mentioned inlet opening 146 communicate, make above-mentioned exit orifice 147 and above-mentioned suction port 127 ... communicate.In order to carry out locating of such thermostat housing 129 around axis, prominent integratedly a pair of prominent bar 129a, the 129a that extends along the axis of thermostat housing 129 that establishing is provided with the groove (not shown) that cooperates with those prominent bar 129a, 129a on the inner face of above-mentioned mounting hole 130 on constant temperature shell 129.

These inlet openings 146 and exit orifice 147 are on the distolateral sidewall that is located at thermostat housing 129 of thermostat housing 129 in sealing component 132 sides, and the wax shell 135 that is entrenched in slidably in the thermostat housing 129 slides between the position cutting off the position between inlet opening 146 and the exit orifice 147 under the cold state of motor E as illustrated in fig. 7 and be communicated with as illustrated in fig. 8 between inlet opening 146 and the exit orifice 147 under motor E warming-up contact condition.

Distolateral at another of thermostat housing 129, between wax shell 135 and lid member 131, forming hydroecium 148, when wax shell 135 is in the position that is cutting off between inlet opening 146 and the exit orifice 147, make suction port 127 ... the other hole 149 that is communicated with above-mentioned hydroecium 148 is being located on the sidewall of thermostat housing 129 with above-mentioned exit orifice 147 position adjacent.And, when other hole 149 has moved to the position that is communicated with between inlet opening 146 and the exit orifice 147 at wax shell 135, with these wax shell 135 sealings.

On lid member 131 connecting tube 150 that is communicated with hydroecium 148 is installed, this connecting tube 150 is connected with water jacket 48.

Below this embodiment's effect is described, because the way to cycle oil 107 that is used for the driven valve chamber 79 of oil is turned back to crankshaft room 42 is located at cylinder head 39 partially round exhaust port 71, comes self-purging heat to pass to the oil of circulation in way to cycle oil 107 effectively by the wall portion that constitutes exhaust port 71.Therefore, when motor E cold starting, can utilize temperature the heat of the exhaust port 71 of fast rising oil is promptly heated up, can improve the warming-up performance of motor E.And because way to cycle oil 107 is round the bottom that is located at cylinder head 39 partially of exhaust port 71, therefore, the structure of the oil that is used for heating up rapidly is extremely simple, with heat up with heater original compare miniaturization and the lightweight that can seek motor E.In addition because cylinder head 39 is configured in the tight rear of front-wheel WF, therefore, can do one's utmost to avoid by the two-wheeled wind that travels will above-mentioned exhaust port 71 near cooling, the influence of the wind of can avoiding travelling and oil is heated up.

In addition, the open and close valve 109 that can open and close way to cycle oil 107 is located on the cylinder head 39, when this open and close valve 109 closes valve owing to the oil that moves in the valve chamber 79 can be turned back to crankshaft room's 42 sides by the chain path 88 that is in the position of leaving with exhaust port 71, therefore, when open and close valve 109 closes valve, can reduce from the influence of the heat of exhaust port 71, can prevent the overheated of oil by the switching of open and close valve 109 to oil.

In addition, exhaust port 71 becomes with the side to the vertical line 73 that is projected in the center 72 of passing firing chamber 45 on the plane of the axis normal of cylinder bore diameter 44 of this exhaust port 71 that the circular-arc mode that bloats to this vertical line 73 sides is bent to form, and way to cycle oil 107 is located on the cylinder head 39 in the bottom of moving valve chamber 79 in the lower opening of exhaust port 71.Therefore, utilize the bending of exhaust port 71 way to cycle oil 107 to be located on the cylinder head 39 with can not can causing cylinder head 39 maximizations, and, owing to the bigger area of the wall portion periphery of exhaust port 71 can be applied flexibly effectively intensification in oil, therefore be accompanied by the uncommon thin burning running that makes the vortexization that exhaust port 71 meanderings are brought even carry out, also can remedy the warming-up reduction that brings by its uncommon thin burning.

In addition, the thermostat 128 as on the pump cover 120 of the part of pump case 116 that is located in the water pump 115 has thermostat housing 129 and wax shell 135, this thermostat housing 129 is cylindric, have the axis vertical and be installed on the pump cover 120 with the shaft axis of the impeller 126 of water pump 115, above-mentioned wax shell 135 built-in wax 140 and can carry out shrinking corresponding sliding action ground and be entrenched in slidably in the thermostat housing 129 with the expansion of this wax 140, exit orifice 147 and suction port 127 ... communicate, this suction port 127 is located on the pump case 126 and with the volute chamber 125 of water pump 115 and is communicated with, inlet opening 146 communicates with the outlet 24b of radiator 24 and corresponding to the switching slidably of wax shell 135 and the partition that is communicated with of above-mentioned exit orifice 147, these suction port 127 inlet openings 146 relatively are located on the sidewall of thermostat housing 129 on a diameter line of thermostat housing 129 mutually.

Therefore, the pressure oscillation of the volute chamber 125 of water pump 115 is by suction port 127 ... and exit orifice 147 acts on wax shell 135 on the direction vertical with its glide direction, the influence that above-mentioned pressure oscillation brings for the sliding action of wax shell 135 is little, thermostat 128 closely is configured with volute chamber 125 with doing one's utmost, can helps the miniaturization of pump cover 120 thus.

Since make thermostat 128 do one's utmost approaching with the volute chamber 125 of water pump 115, by making suction port 127 ... suction pressure act directly on the above-mentioned exit orifice 147 and can realize increasing the circulating load of cooling water, improve cooling performance.

Owing to carrying out transmission of heat on the wax 140 in being built in wax shell 135, therefore do not needing to guarantee to be used to make cooling water to circulate in wax shell 135 large space on every side by means of thermostat housing 129 and wax shell 135.The miniaturization of thermostat 128 itself can be realized thus, pump cover 120 miniaturizations can be further made thus.

In addition, owing on the sidewall of thermostat housing 129, be adjacent to be provided with other hole 149 with exit orifice 147, this hole, side 149 makes the suction port 127 of water pump 115 under the state that cuts off 147 of inlet opening 146 and exit orifices with wax shell 135 ... be communicated with water jacket 48, therefore, when motor E cold state, suction port 127 ... suction pressure act directly on the other hole 149, this hole, side 149 is used to make cooling water circuitous radiator 24 ground circulation, even the necessary circulating load of the cooling water when setting the opening area in other hole 147 littlely and also can guarantee the cold state of motor E, can further make thermostat 128 self miniaturization, also can make pump cover 120 miniaturization more.

Embodiments of the invention more than have been described, but the present invention is not limited to the foregoing description, under the situation of the present invention that does not break away from the scope that is recorded in claim, can carries out all design alterations.

As mentioned above, according to first technological scheme of the present invention, can when engine cold starting, utilize temperature the heat of the exhaust port of the fast rising driven valve chamber that promptly heats up return the oil of crankshaft room, can improve the warming-up performance of motor, and the oily structure that is used for heating up rapidly is extremely simple, can avoid the maximization of motor and weight to increase.

In addition, according to a second technical aspect of the present invention, can prevent the overheated of oil by the switching of open and close valve.

In addition, according to a third technical aspect of the present invention, can under the situation that cylinder head is maximized, way to cycle oil be located on the cylinder head, and, the bigger area of the wall portion periphery of exhaust port can be applied flexibly effectively intensification in oil, even therefore implementation is accompanied by wishing of vortexization and approaches the burning running, also can remedy the reduction of wishing the warming-up that approaching burns is brought.

Claims (3)

1. the oil return structure of motor, the cylinder head of this motor (39) makes exhaust port (71) under shed, this cylinder head (39) combines with cylinder block (38), this cylinder block (38) has the cylinder bore diameter (44) of this cylinder head (39) side as the top position earth tilt, housing (78) and cylinder head (39) between form the moving valve chamber (79) take in active valve mechanism (76), this housing (78) combines with above-mentioned cylinder head (39), it is characterized in that, crankshaft room (42) is formed in the crankcase (40) that combines with above-mentioned cylinder block (38), and the way to cycle oil (107) that will turn back to this crankshaft room (42) from the oil of above-mentioned moving valve chamber (79) surrounds the bottom that is located at cylinder head (39) partially of above-mentioned exhaust port (71).

2. the oil return structure of motor as claimed in claim 1, it is characterized in that, the open and close valve (109) that can open and close above-mentioned way to cycle oil (107) is located on the above-mentioned cylinder head (39), and the path (88) that can the oil in the above-mentioned moving valve chamber (79) be turned back to crankshaft room (42) side corresponding to closing of this open and close valve (109) is located on the cylinder head (39) with the position that isolates with above-mentioned exhaust port (71).

3. as the oil return structure of claim 1 or the described motor of claim 2, it is characterized in that, form above-mentioned exhaust port (71) agley, this exhaust port (71) is invested projection on the plane with the axis normal of above-mentioned cylinder bore diameter (44) becomes circular-arc at this vertical line of a side direction (73) side drum of the vertical line (73) at the center (72) by firing chamber (45).This firing chamber (45) faces the top of the piston (43) that is entrenched in slidably in the above-mentioned cylinder bore diameter (44); Above-mentioned way to cycle oil (107) in the below of above-mentioned exhaust port (71) and be opened on above-mentioned moving valve chamber (79) the bottom be located on the above-mentioned cylinder head (39).

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