CN100350138C

CN100350138C - Engine cooling system

Info

Publication number: CN100350138C
Application number: CNB2004101034497A
Authority: CN
Inventors: 驹井弘和; 重森贵文; 古川直树; 吉本公一
Original assignee: Mitsubishi Motors Corp
Current assignee: Mitsubishi Motors Corp
Priority date: 2003-12-25
Filing date: 2004-12-27
Publication date: 2007-11-21
Anticipated expiration: 2024-12-27
Also published as: CN1637244A; DE102004062293A1

Abstract

To provide an engine cooling device.In the engine cooling device, an inner side passage 47 and an outer side passage 48 are formed such that cooling water from an introducing chamber 44a surrounded by a rear opposing part 39b and a one end side opposing part 39r of an outer peripheral longitudinal wall 39, an intake port forming wall 45 and the head bolt boss 46 flows in both sides of the head bolt boss 46.

Description

Engine-cooling system

Technical field

The present invention relates to a kind of cooling system that is used for water-cooled engine, relate in particular to a kind of engine-cooling system, in this engine-cooling system, the cooling liquid of being discharged by water pump is designed to directly supply in the cooling jacket in the cylinder head.

The invention still further relates to a kind of engine-cooling system, this system is recycled in the cooling jacket cylinder head and the cylinder block and cooled engine from cooling jacket by making cooling liquid.

Background technique

The water-cooled engine cooling system comprises coolant circulation system and cylinder head, in coolant circulation system, the cooling liquid of being discharged by water pump is fed in the cooling jacket of cylinder block, cylinder block has wherein formed engine main body, simultaneously, when the temperature step-down of the various piece circuit cooling liquid by cooling jacket, short-channel will be opened, so that cooling liquid directly heats from the inlet channel that short-channel turns back to water pump, otherwise, when the temperature of cooling liquid raises, the major cycle passage will be opened, and wherein radiating fin is provided with along this major cycle passage, cools off so that cooling liquid can flow to radiating fin, then, turn back to the inlet channel of water pump in the cooling liquid of radiating fin cooling.

According to this coolant circulation system, the circulation mode of cooling liquid will be according to the cooling characteristics of the difference of supplementary equipment, particularly cylinder block and head and is determined that supplementary equipment wherein for example is a water pump, temperature-adjusting device is along the radiator of coolant circulation system installation.That is to say, cylinder head need be cooled off fully, this be since the joined wall of the cylinder head relative with cylinder block towards firing chamber and relief opening, therefore cylinder head is easy to be heated to high temperature, but, cylinder block also needs to guarantee the temperature suitable, and this is because cylinder block needs to keep suitable gap between the pistons reciprocating in each cylinder that forms therein and the cylinder, and makes lubricant oil maintain suitable temperature.

Like this, just proposed to adopt the engine-cooling system of basic circulation mode, in this system, the cooling liquid of passing cooling jacket in the cylinder block is from the last wall opening of cylinder block flow into cooling jacket in the cylinder head, and cooling liquid is diffused into its whole zone in this way, and turns back to water pump subsequently, in this case, when the cooling liquid smooth flow, it flows to head portion from the bottom part of engine main body substantially, and the cooling effectiveness of cylinder head becomes relatively low.

On the contrary, in having the engine-cooling system of following refrigerating mode, flow in the cooling jacket in the cylinder head and at first cylinder head is cooled off from the cooling liquid of water pump, then make the cooling jacket in the cooling liquid inflow cylinder block of passing the cylinder head cooling jacket, cooling liquid is turned back in the water pump, at this moment, the cooling effectiveness of cylinder head becomes higher, but owing to the temperature of the cooling liquid that the flows into cylinder block one side difference along with the engine operation scope changes, therefore a side of control cylinder body stably is to remain to it suitable temperature.

Selectively, in having the engine system of another refrigerating mode, the cooling liquid of being discharged by water pump is divided into two tributaries and flows in the cylinder block and head simultaneously, then, these two tributaries are converged and are turned back to water pump together, so that cylinder head and cylinder block all are cooled and maintain suitable temperature.

It should be noted that the cooling system that cooling liquid is divided into the tributary and flows into cylinder block and head simultaneously is existing disclosed in JP-A-2003-172140.

In addition, in the engine-cooling system of shunting cooling liquid, cylinder head and cylinder block can be cooled and maintain suitable temperature, in order to obtain this effect, the cooling liquid of discharging from water pump is not the cooling jacket that flows directly into the cylinder block, but directly introduce the single suction port that forms near the cylinder head of the vertical end of motor, then, the cooling liquid outlet of the cooling liquid of introducing on the vertical the other end of motor flows.

In this case, according to JP-A-2003-172140, the discharge route of water pump is separated into two at engine interior, thereby makes cooling liquid flow into cylinder head one side and cylinder block one side simultaneously.

If make the engine structure compactness, need suction port with cylinder head be arranged on the joined wall of cylinder block of cylinder head and one end, so that it is as much as possible near cylinder head inside.

Yet, towards the wall of firing chamber, air inlet and relief opening, the cylinder head bolt protruding part that cylinder head bolt passes from its inside, oil pipe etc. are all concentrated around the suction port that is arranged on cylinder head one end, in this case, are difficult to form the cooling channel.

Proposed the present invention in view of the above problems, one object of the present invention is to provide a kind of engine-cooling system, and this system has effectively utilized the cylinder head bolt flange.

In addition, in the engine-cooling system of shunting liquid circulation pattern, make cylinder head and cylinder block can be cooled and maintain suitable temperature, need part flow arrangement be set along the shunting coolant circulation system, this device is used to adjust the sendout that enters cylinder head one side and cylinder block one side from the cooling liquid of water pump discharge, this just is easy to owing to assembly properties cause some problems, wherein assembly properties are subjected to the complexity of part flow arrangement installing space, part flow arrangement and expensive influence, therefore need improve these defectives.

Summary of the invention

The present invention has In view of the foregoing been proposed, wherein one object of the present invention is to provide a kind of engine-cooling system, in this system, after cooling liquid is discharged from water pump, the cooling liquid that the water pump of one end setting of cylinder block is discharged is divided into two tributaries, flow into cylinder block and head simultaneously, and have simple structure.

According to a first aspect of the invention, provide a kind of engine-cooling system, this cooling system comprises the suction port that is formed on the cylinder head, and is fed into this suction port from the cooling liquid of water pump; And cylinder head bolt boss, be positioned at the near zone of suction port, and be used for the cylinder head bolt that cylinder head is fixed on the cylinder block is passed through this cylinder head bolt boss ordinatedly, this engine-cooling system is characterised in that and comprises: suction chamber, separate by the outer wall of cylinder head bolt boss, the outer wall of suction port and the inwall of cylinder head, so that the adjacent setting with suction port of suction chamber and cylinder head bolt boss, and cooling liquid is introduced in suction chamber from suction port; First stream is formed between cylinder head bolt boss and the suction port, so that it is mobile along the outer wall of suction port to be incorporated into the cooling liquid of suction chamber; And second stream, be formed between the gentle inboard wall of cylinder cover of cylinder head bolt boss, so that the cooling liquid that is incorporated into suction chamber flows along the inwall of cylinder head.

According to a second aspect of the invention, provide a kind of engine-cooling system according to first aspect present invention, wherein, the cross sectional area of second stream is set at the cross sectional area greater than first stream.

According to a third aspect of the invention we, provide a kind of engine-cooling system, also further comprised according to first aspect present invention: the main passage, the cooling liquid of discharging from water pump can flow into the main passage, and is used for cooling liquid is directed into suction port from cylinder block; Cooling jacket, the skin of a plurality of cylinders that form on the cylinder block and forming; Partition wall is used for main passage and cooling jacket are separated; And splitter section, cut away partition wall by upper surface and form, so that the part cooling liquid that in the main passage, flows guiding cooling jacket from cylinder block.

According to a forth aspect of the invention, provide a kind of engine-cooling system, wherein, comprised a plurality of bolts hole that are formed at cylinder block top, and cylinder head bolt can pass through these a plurality of bolts hole according to third aspect present invention; In addition, the main passage is positioned near the bolt hole foremost of cylinder block, and this place also is provided with chain case.

According to a fifth aspect of the invention, provide a kind of engine-cooling system according to fourth aspect present invention, wherein, the main passage is at least by the arch outer wall at the bolt hole place of formation, constituted along the outer wall and the partition wall of the longitudinal extension of cylinder block.

According to a first aspect of the invention, form because suction chamber nestles up the inboard of cylinder head, thereby can obtain suitable cooling passage, and be not subjected to the influence of cylinder head boss.

According to a second aspect of the invention, because the cross sectional area of second stream is set at the cross sectional area greater than first stream, therefore can prevent that cooling liquid is stuck in suction chamber.

According to a third aspect of the invention we, can regulate the coolant rate ratio between the cooling jacket of the cooling jacket of cylinder head one side and cylinder block one side by simple structure, make its increase or minimizing, cooling liquid can supply to cylinder block and head with suitable amount respectively thus, so that cool off them fully.

According to the of the present invention the 4th and the 5th aspect, the adjacent cylinder block in main passage is inboard to be formed, thereby can prevent the too huge of motor.

Description of drawings

Fig. 1 is the schematic side elevation of motor, and this motor comprises the engine-cooling system according to first embodiment of the invention;

Fig. 2 is the amplification view of the cylinder head of motor shown in Fig. 1;

Fig. 3 is the sectional view of the major component of engine cylinder shown in Fig. 1;

Fig. 4 is the Zoom Side sectional view of engine cylinder cap shown in Fig. 1;

Fig. 5 is an amplification view, shows the near zone of the cylinder head bolt boss that the cylinder among Fig. 1 covers;

Fig. 6 is the exploded perspective view of engine cylinder cap shown in Figure 1 and cylinder block;

Fig. 7 is the diagrammatic plan view that comprises according to the motor of the engine-cooling system of second embodiment of the invention;

Fig. 8 is the schematic plan view of motor shown in Figure 7;

Fig. 9 is a sectional view, shows the major component of engine cylinder shown in Figure 7;

Figure 10 is an amplification view, shows the major component of the motor shown in Fig. 7;

Figure 11 amplifies sectional block diagram, shows the opening near zone on the engine cylinder shown in Fig. 7;

Figure 12 amplifies sectional front view, shows the opening near zone on the cylinder block shown in Fig. 7; And

Figure 13 is an exploded perspective view, shows engine cylinder cap shown in Fig. 7 and cylinder block.

Embodiment

Fig. 1 shows first embodiment according to engine-cooling system of the present invention.This cooling system is installed in the four stroke engine, wherein this four stroke engine (hereinafter, abbreviate motor 1 as) comprise four valve type gas handling systems, and this cooling system is by cooling off motor along the coolant circulation system R circuit cooling liquid that is installed in engine interior and outside.

In motor 1, cylinder head 3 is connected in order successively with valve mechanism cover 4, and forms integral body with the upside of cylinder block 2, and oil sump 5 integrally is connected on the skirt section of cylinder block 2 downsides, so that the bottom of closed cylinder body 2, thereby form crankcase at the bottom part of cylinder block 2.Chain case 6 is arranged on an end of oil sump 5, so that integrally link together each other, thereby forms engine main body.Just as illustrated in fig. 1 and 2, a plurality of piston S are arranged on the inside of cylinder block 2 and cylinder head 3, in addition, motor 1 also comprises other element, as intake and exhaust system and valvetrain system, this is all not shown in the drawings, and these elements are respectively applied for the suction and the discharge of the interior gas of control firing chamber C (with reference to Fig. 4), also comprise bent axle 7 in addition, it can be rotated by the output that receives the piston acquisition.Be noted that, in Fig. 2, only show the suction port 8 and the relief opening 9 of intake and exhaust system.

The above-mentioned cooling system that is installed in the engine main body comprises temperature-adjusting device 12, water pump 13, and setting radiator 11 in its vicinity.Radiator 11 is arranged on the adjacent domain of the other end (right-hand side among Fig. 1) of cylinder block 2, be connected on the cylinder block 2 by the

pipeline

14,15 that uses top and bottom, temperature-adjusting device 12 and water pump 13 are installed in respectively on the

outer wall

16b and 16g of cylinder block 2 (an approaching person's with the aid of pictures side and the downside among Fig. 2 among Fig. 1).

The cylinder S of a plurality of vertical (at Vertical direction Z) is provided at predetermined intervals inside in cylinder block 2 along vertical X of motor, a plurality of cylinder S are covered by 17 of the cooling jackets of cylinder block one side around it continuously, in addition, the outside of cooling jacket 17 covers continuously by the perpendicular outer wall 16 (comprising 16b) of front, rear, left and right.And the perpendicular outer wall 16 of these four cylinder S and front, rear, left and right interconnects by joined wall part 18 and connecting wall 19, thereby makes the cooling jacket 17 of cylinder block one side form enclosed space.

The opening m that will describe after a while is formed at the inside, top of the outer wall 16 of the cooling jacket 17 of cylinder block one side and cooling jacket 17 1 ends, so that from the cooling liquid inlet opening that extends passage 37, this will describe after a while.In addition, stream 54 is formed on the joined wall 38, wherein this joined wall engages at the top of its other end with the cooling jacket 17 of cylinder block one side, and stream 54 forms the circular flow Fb that can make in the cooling jacket 17 of cylinder block one side and flows out from exporting 52 through the cooling jacket 42 of cylinder head one side.

One end of cylinder block 2 (downside of Fig. 3) forms end inwall 16f, extension 16g forms in the mode that the left and right sides distal process from end inwall 16f goes out, the flange portion of the extending end of each extension 16g cooperates with the flange connector 601 of chain case (chain case) 6 like this, be used for making its connection secured to one another by bolt, not shown.

Water pump 13 among the coolant circulation system R and temperature-adjusting device 12 abut one another the position (lower end right-hand side among Fig. 3) of mating mutually at the end of cylinder block 2 inwall 16f and rear end outer wall 16b.

As shown in Figure 3, on temperature-adjusting device 12, columniform base portion 21 is to form from the outstanding mode of rear end outer wall 16b, so that cover temperature-adjusting device 12, and lid shape attachment portion 22 integrally is connected to the annular termination part of columniform base portion 21, thereby formation housing parts, its inside be separated with form first and

second suction chambers

23,24 and between exhaust chamber 25.In addition, temperature-adjusting device 12 comprises first and

second valve elements

27,28, can open and close first and

second suction chambers

23,24 of interlock mode by regulating valve, connects through temperature sensing part 26 is whole mutually simultaneously.This temperature sensing part 26 can switch and is moved first and

second valve elements

27,28, so that the cooling liquids in first and

second suction chambers

23,24 are optionally introduced in the exhaust chamber 25.

Just as shown in figures 1 and 3, first suction chamber 23 is connected to the branched bottom part 291 of the discharge route 29 of cylinder head 3 by short-channel 31.Similarly, second suction chamber 24 is connected to the protruding terminus of discharge route 29 by cooling channel 32, and wherein the cooling channel comprises upper end passage 14, radiator 11 and lower end passage 15.

As shown in Figure 3, exhaust chamber 25 is connected with gas-entered passageway 34, and this gas-entered passageway is by protrusion walls part 33, and wherein this protrusion walls part goes out and is communicated with pump chamber 131 from the distal process of rear end outer wall 16b, and it will be in description after a while.

Protrusion walls part 33 and rear end outer wall 16b and wherein the extension 16g on most proximal end one side match, and along the horizontal Y projection of cylinder.Especially, towards with the protrusion walls part 33 of an end of cylinder block 2 (Fig. 3 below) form the surface that is extended to the left side and extension, the right 16g towards an end surfaces F, and the housing of chain case 6 connects surperficial fc to form with this mode towards the tight adjacency of an end surfaces F.

Chain case 6 comprises flange connector 601 and antetheca 602, and wherein this flange connector is continuous substantially in Vertical direction, and forms concave surface or U-shaped cross-section when seeing from above, therefore, when being connected to towards an end surfaces F, forms Transmitted chains accommodating chamber 30.In addition, be formed with thick enlarged 36 towards the part of protrusion walls part 33 is whole in a continuous manner, and water pump 13 also is arranged on this position.

The housing that water pump 13 is arranged on thick enlarged 36 connects in the interior groove of surperficial fc, and comprises the pump chamber 131 that is connected with gas-entered passageway 34; Pump impeller, not shown, this pump impeller is contained in the pump chamber 131; Pump drive, not shown, the running shaft of pump impeller is connected on this drive unit, and this drive unit is installed in the outer wall side of thick enlarged 36 and the discharge route 132 of chain case one side of stretching out from pump chamber 131 tops.Water pump 13 obtains to drive output from drive part wherein, and is not shown, thereby liquid circulation is supplied with to coolant circulation system R.

The end of the discharge route 132 of chain case one side with protrusion walls part 33 1 sides on the mode that is interconnected of extension passage 37 and form.

Just as shown in figures 1 and 3, extend passage 37 and comprise the located lateral part 371 that is formed at outstanding wall section 33 proximal part inside, and Vertical location part 372, this Vertical location partly is formed at the inside of the thick end of rear end outer wall 16b, so that can be extended to located lateral part 371, thereby the cooling jacket 17 of feasible and cylinder block one side is severed.The upper end of Vertical location part 372 forms intercommunicating pore 372m, and this intercommunicating pore is used for forming opening in joined wall part 18, and this joined wall is the upper wall of rear end outer wall 16b.

Especially, the open part of intercommunicating pore 372 to be forming towards the cooling jacket 42 recessed modes of cylinder head one side, and identical part by and the joined wall part (lower wall) of cylinder head 3 match and form branch road r.The end portion of branch road r forms the opening m towards the cooling jacket 17 of cylinder block one side.

Therefore, Vertical location part 372 is with the cooling liquid separated into two parts, and a part is by the stream of the cooling jacket 42 of connecting port 372m flow direction arrival cylinder head one side, and another part flows to the opening m of the cooling jacket 17 that arrives cylinder block one side.Wherein this Vertical location partly is formed at the thick part of rear end outer wall 16b, thereby makes cooling liquid upwards flow.

Joined wall part 38, promptly the lower end wall of cylinder head 3 overlays by packing ring on the joined wall 18 (upper end wall) of cylinder block 2, and is not shown.Ring-type excircle vertical wall 39 is formed on the joined wall part 38 of cylinder head, can extend continuously in vertical direction from the outward edge of joined wall part 38 like this, and midfeather 41 (with reference to Fig. 4) integrally is connected to the inner wall section of ring-type excircle vertical wall 39 by a kind of irregular mode, like this, the cooling jacket 42 of cylinder head one side forms between midfeather 41 and joined wall part 38, wherein, midfeather be positioned at the upper end and joined wall partly is positioned at the lower end.Be noted that the reference number among Fig. 2 " e " is represented seal cap, is used to seal mold, the hole that forms when eliminating casting.

The cooling jacket 42 of cylinder head one side is formed in valve mechanism and the mutual hands-off space of ignition system, and wherein these two systems are all not shown.As shown in Figure 4, wall 381 towards the firing chamber is formed at the joined wall part 38 of cylinder head 3 in the part towards each cylinder S, and the mounting hole P2 that is used to be installed into the hole P1 of air valve and outlet valve (not shown) and is used to install spark plug 43 is formed at the wall 381 towards the firing chamber.

The cooling jacket 42 of cylinder head one side forms cooling passage, this cooling passage extends continuously along vertical X of motor, and central air induction mouth 44 (seeing figures.1.and.2) is formed at the joined wall part 38 of one end, but, wherein exhaust port 52 exhaust port boss 521 formed thereon are formed on the ring-type excircle vertical wall 39 of the other end of joined wall part 38, and discharge route 29 integrally is connected on the exhaust port boss 521.

When the joined wall part 18 of the joined wall part 38 of cylinder head 3 and cylinder block 2 matched, central air induction mouth 44 was interconnected with intercommunicating pore 372m, so that the cooling liquid of being discharged by water pump 13 is introduced its inside by extension tube part 37.

As Fig. 2 and shown in Figure 5, by the cooling liquid inflow suction chamber 44A of central air induction mouth 44.In addition, the height h of the last end spaces of suction chamber 44A (with reference to Fig. 4 and Fig. 5) is limited by midfeather 41, around the suction chamber 44 by excircle vertical wall 39 to rear section 39b and form the cylinder head bolt boss 46 that wall 45 and cylinder head bolt (not shown) pass wherein towards the suction port of an end portion 39r, suction port p1 with matching and centered on.Cylinder head bolt boss 46 is formed with vent diverter, inner passage 47 (first stream) is formed at cylinder head bolt boss 46 and the firing chamber forms between the wall 45, passage as inner tributary s1, and external channel 48 (second stream) is formed at cylinder head bolt boss 46 and towards between the end portion 39r, as the passage of outside tributary s2.Be noted that suction chamber 44 is separated into inner tributary s1, outside tributary s2 and suction port lower end tributary f3 with cooling liquid, wherein tributary, suction port lower end flows directly to the end portion that suction port forms wall 45.

Inner passage 47 produces inner tributary s1, this tributary is the part of cooling liquid stream, wall 381 (with reference to Fig. 4) from cooling liquid inlet chamber 44A along from approaching face to the firing chamber flows, wherein, should be the part relative with the firing chamber C of cylinder S towards the wall of firing chamber, cylinder be positioned at an end (left end shown in Figure 4) of exterior periphery vertical wall 39.External channel 48 produces outside tributary s2, along flowing towards an end portion 39r, should be that tap hole towards tap hole p1 forms the outer circumferential wall on end wall 53, exterior periphery vertical wall 39 (left end shown in Figure 4) from another part of cooling liquid inlet chamber 44A towards an end portion.Like this, cylinder head bolt boss 46 is as vent diverter, and it will cool off and also be divided at a side in its peripheral wall outside and tributary, the inside s1 and the outside tributary s2 of opposite side.

Because cylinder head bolt boss 46 forms the passage (inner passage 47 and external channel 48) that wall 45 forms predetermined width by its outer circumferential wall, exterior periphery vertical wall 39 and suction port, cylinder head bolt boss 46 also can be used as the Flow-rate adjustment element, is used to regulate inner tributary s1 and outside tributary s2.

Here, guarantee that wherein cylinder head bolt boss 46 forms in vertically (Vertical direction among Fig. 5) and has bigger size, the stream zone that is used for the external channel 48 (second stream) of the inner passage 47 (first stream) of inner tributary s1 and outside tributary s2 like this can increase as far as possible, therefore, thus the stream zone can increase with comparalive ease guarantees that capacity increases.In addition, when the stream zone of external channel 48 is set at greater than the stream of inner passage 47 zone, can prevent that cooling liquid is trapped in the suction chamber 44.

Be noted that when the outer circumferential wall of cylinder head bolt boss 46 formed columniform outer circumferential wall, it was shaped as shown in the two point dotted line chain among Fig. 3, simultaneously, the Flow-rate adjustment effect further improves.

The cooling jacket 42 of cylinder head one side forms central stream F1, it can make cooling liquid flow along the middle section of the cooling jacket 42 of cylinder head one side, this middle section is the wall 381 towards the firing chamber of each cylinder on the vertical X of motor in succession, and walks around the suction port of each cylinder and end bypass channel F2, the F3 that relief opening forms the bottom zone of

wall

45,53.

The operation of the cooling system of the motor of having described so far will be described below.

When water pump driver element (not shown) drives water pump 13, shunted in discharge route 132 and extension passage 37 backs from the cooling liquid that inlet channel 34 has entered, thereby flowed into the cooling jacket 17 of cylinder block one side and the cooling jacket 42 of cylinder head one side by connecting port 372m and central air induction mouth 44 by chain case one side.Then, the cooling liquid by cooling jacket separately arrives discharge route 29 and turns back to water pump 13.Simultaneously, when motor just in preheating the time, because coolant temperature is relatively low, temperature-adjusting device 12 opens short-channel 31 and cuts out cooling channel 32, and cooling liquid is not having to turn back to water pump 13 from discharge route 29 under the situation of heat dissipation like this.On the contrary, when motor heats, because coolant temperature is higher relatively, temperature-adjusting device 12 cuts out short-channel 31 and opens cooling channel 32, heat from the cooling liquid of discharge route 29 distributes at radiator 11 places like this, and cooling liquid turns back to water pump 13 afterwards.

In engine-cooling system, flow into the cooling liquid of the cooling jacket 42 of cylinder head one side from central suction port 44, wherein mainly flowed into central stream F1 by tributary, the inside s1 of cylinder head bolt boss 46 separations and the part of outside tributary s2, so that cool off the air inlet of each cylinder and near the part that relief opening

forms wall

45,53, wherein this part approaches the part towards the flame surface of contact of ignition system of cylinder, flows to discharge route 29 then.

In addition, the part of the outside tributary s2 that is separated by cylinder head bolt boss 46 flows to the bypass passageways F3 of end, thus the relief opening that cools off each cylinder S form wall 53 near, flow to discharge route 29 then.Similarly, flow into end bypass passageways F2 from the cooling liquid stream f3 of the suction port lower end that central suction port 44 flows out, thus the suction port that cools off each cylinder S form wall 45 near, flow to discharge route 29 by exhaust port 52 then.

Therefore, in engine-cooling system, central air induction mouth 44 is formed on the joined wall part 38 of cylinder head 3.Then, cooling liquid from the discharge route 132 of chain case one side of water pump 13 flows through extension 37, wherein this extension be formed at cylinder block 2 to rear section 39, and be assigned with the cooling jacket 17 that supplies to cylinder block one side, direct into central air induction mouth 44 then, thereby supply to the cooling jacket 42 of cylinder head one side.Thus, avoid in the perimeter near engine main body the cooling liquid inlet passage being set, therefore, just needn't guarantee to be provided with the space of external refrigeration liquid inlet passage, final cooling system according to the present invention like this can be guaranteed the simplicity of installing.

In addition, will be separated into inner tributary s1 and outside tributary s2 from the cooling liquid that central suction port 44 flows into as the cylinder head bolt boss 46 of vent diverter, it flows into central stream F1 and end bypass passageways F2, F3 from central suction chamber 44A.Thus, the central stream F1 of inner tributary s1 inflow can guarantee that inner tributary s1 flows to the middle section of the cooling jacket 42 of cylinder head one side, flows to the exhaust port 52 that is positioned at the cylinder head the other end afterwards.And the cooling liquid in the end bypass passageways F3 that outside tributary s2 flows into can be cooled off exhaust port and form wall 53, then flows to exhaust port 52, thereby can obtain good cooling effectiveness at the relatively large position assurance of heat.

In addition, (for example, peripheral wall a) can be adjusted the shape of the stream of inner tributary s1 and outside tributary s2, and independent fluid control elements need be provided, and therefore can improve cooling effectiveness when restraining the cost increase.

And, because the cooling liquid that flows in centre gangway F1 and the end bypass passageways F3 is divided into inner tributary s1 and outside tributary s2, therefore, the stream zone of the external channel 48 that outside tributary s2 flows therein can be less relatively, can eliminate or need not towards the projection of Transmitted chains accommodating chamber 30 1 sides thus, Transmitted chains accommodating chamber wherein is the outside towards an end portion 39 that forms the outer circumferential surface of cylinder head, thereby makes it possible to increase the space availability ratio of Transmitted chains accommodating chamber 30.

In the description of being done before this, motor shown in Fig. 1 has four valve type intake and exhaust systems, same the present invention also can be applied to two valve h type engine hs, in this case, has basically and engine-cooling system identical functions shown in Figure 1 and effect.

Second embodiment:

Engine-cooling system according to second embodiment of the invention has been shown among Fig. 7 and Fig. 8.This cooling system is installed in the four stroke engine (hereinafter, abbreviating motor 1 as) of automobile, by the coolant circulation system R circuit cooling liquid along engine interior and outer installment this motor is cooled off.

Upper surface in cylinder block 102 is provided with cylinder head 103, and by the cylinder head bolt (not shown) being penetrated a plurality of hole A (with reference to Fig. 7), and above-mentioned cylinder head is fixed to the upper surface of cylinder block, wherein, these a plurality of hole A extend from the upper surface of cylinder head 102, pass cylinder head 102 and enter in the cylinder block 103.In motor 101, valve mechanism cover 111 is arranged on the upside of cylinder head 103, oil sump 104 is arranged on the downside of cylinder block 102, and chain case 105 is arranged on an end of cylinder head 103 and cylinder block 102, and these parts integrally are joined together to form engine main body.A plurality of cylinder S are arranged on the inside of cylinder block 102 and cylinder head 103, in addition, motor 101 also comprises other element, as intake and exhaust system, valvetrain system, these two systems all do not illustrate in the drawings, their designs are used for controlling the air inlet and the exhaust of the firing chamber that is formed at cylinder interior, and also comprise bent axle 106, and it can rotate in the firing chamber by the output that receives the acquisition of piston (not shown).Be noted that, in Fig. 8, only show intake manifold 107 and gas exhaust manifold.

The annex of engine-cooling system such as radiator 109, temperature-adjusting device 112 and water pump 113 all are arranged on the outer wall and the near zone of engine main body.Here, the assembled portion (the lid type is connected) on the radiator temperature-adjusting device 112 that is connected to bell tap (discharge route) 126, upper end passage 114, the lower end passage 115 of cylinder head rear end and is positioned at the cylinder block fore-end.Temperature-adjusting device 112 is installed in the left side of cylinder block 102, and water pump 113 is installed in the front side of chain case 105.

Vertical X is with predetermined being disposed in the cylinder block 102 along motor for a plurality of vertical (in Vertical direction z location) cylinder S, and these a plurality of cylinder S are by 116 continued circlings of the cooling jacket of cylinder block one side.In addition, the outside of the cooling jacket 116 of cylinder block one side is covered continuously by front, rear, left and right perpendicular outer wall 117, the top and bottom of four cylinder S and front, rear, left and right perpendicular outer wall 117 interconnect by joined wall part 118 and connecting wall 119, make the cooling jacket 116 of cylinder block one side form an enclosed space thus.Be noted that on cylinder block 102, skirt section 171 forms in the mode of extending from connecting wall 119 downwards, lower ending opening wherein is by oil sump 104 sealings, thus the formation crankcase.

Here, one side of cylinder block 102 or front side (lower part wall among Fig. 9) form end inwall 117f, extension 117g forms in the mode that the left and right sides distal process from end inwall 117f goes out, and the flange portion on the extending end of extension 117g overlays on the flange connector 502 of chain case 105, thus, by the bolt (not shown) flange portion and flange connector are tightened together.

The water pump 113 of coolant circulation system R and temperature-adjusting device 112 are separately positioned on the left side (among Fig. 7 and Figure 10 near a person's with the aid of pictures side and the left-hand side of Fig. 8) of end inwall 117f and cylinder block 102, and so that its mode close to each other be provided with.

Shown in Fig. 8,9 and 10, temperature-adjusting device 112 forms and makes its columniform base portion 121 outstanding from left side outer wall 117b, lid type attachment portion 122 closely and integrally is connected to the ring-shaped end part of air cylinder base part 121, thereby the formation housing parts, first, second suction chamber 123,124 is formed at enclosure.And, being provided with valve element 130, it selectively opens first and second suction chambers 123,124, and the part of valve element links together with the temperature probe portion 110 that is held on therebetween.Temperature probe portion 110 is optionally introduced cooling liquid in the suction chamber 123 by the temperature of surveying cooling liquid, thereby control flows into the temperature of in-engine cooling liquid.

Shown in Fig. 7 and Fig. 8, the discharge route 126 of cylinder head 103 (will describe after a while) passes heater 150 and is connected to first suction chamber 123 by short circuit 127.Equally, the projecting end of discharge route 126 is connected to second suction chamber 124 by cooling channel 128, and wherein this cooling channel 128 comprises upper end passage 114, radiator 109 and lower end passage 115.

Just as shown in Figures 9 and 10, suction chamber 123,124 and inlet channel 132 are connected, wherein this passage passes from the base portion 121 of cylinder and the protrusion walls part 129 of left side outer wall section 117b projection, and suction chamber also is connected with pump chamber 131, and this will describe after a while.

As Fig. 9 and shown in Figure 10, protrusion walls part 129 and left side outer wall section 117b and wherein nearest one distolateral extension 117g crossover, and outstanding along the horizontal Y of cylinder.Especially, towards the protrusion walls part 129 of a side of cylinder block 102 (below among Fig. 9) form the surface that is extended to left side and extension, right side 117g towards an end surfaces F, and the housing of chain case 105 connects surperficial fc to form with this mode towards the tight adjacency of an end surfaces F.

Chain case 105 has antetheca 501 and left and right sides sidewall 502, and in the Vertical direction continuity, this chain case forms left and right sides sidewall basically, when being connected to towards an end surfaces F, from the upper end, can obtain concave surface or U type cross section, thereby form the Transmitted chains accommodating chamber 133 of central authorities.In addition, thicker enlarged 134 is integrally formed in the part towards protrusion walls part 129, make it begin therefrom to extend, and water pump 113 also is arranged on this position.

Water pump 113 is arranged on front one side of thick enlarged 134, comprising: pump chamber 131 is connected with inlet channel 1032; Pump impeller, not shown, it is contained in the pump chamber 131; Water pump driving side attachment portion 133, wherein the running shaft of pump impeller connects thereon, and be fixed to the outer wall side of thick enlarged 134 and the discharge route 1132 of chain case one side of extending from the upper end of pump chamber 131 on.The end of the discharge route 1132 of chain case one side be formed at protrusion walls part 129 on the mode that is connected of extension passage 135 and form.

Just as shown in Figures 9 and 10, extend passage 135 (main passage) and comprise located lateral part 351, be formed at the most proximal end inside of protrusion walls part 129; With Vertical location part 352, extend to above-mentioned located lateral part 351, and be formed at the thick portion of left side outer wall section (partition wall) 117b that separates with the cooling jacket 116 of cylinder block one side.Be provided with Vertical location part 352 near the bolt hole A foremost of cylinder block 102, wherein, chain case 105 is mounted thereto, and is centered on by the longitudinal extension outer wall 117 of the outer wall of bolt hole A, cylinder block 102 and rear wall section 117b.

The upper end of Vertical location part 352 and trench portions h are connected, and this trench portions is arranged in the groove structure of the upper wall of left side outer wall section 117b.When the joined wall of cylinder head 103 part (lower wall) 137 stacks superincumbent the time, trench portions h forms stream.Part towards the trench portions h of Vertical location part 352 is connected with the cooling jacket 136 of cylinder head one side by being formed at the through hole 140 in the joined wall part 137, thereby forms the first stream r1.In addition, extend to the part of trench portions h of the cooling jacket 116 of cylinder block one side from part towards Vertical location part 352, just form second channel r2 in the time of above joined wall part 137 overlays, this second channel is from the first stream r1 bifurcated, and trench portions is connected by the cooling jacket 116 of perforate (component) m and cylinder block one side.

Therefore, when overlaying on the joined wall part 118 of left outer wall section 117b when the joined wall part 137 (lower wall) of cylinder head one side, thick portion at left side outer wall section 117b just is formed with: extend passage (main passage) 135, cooling liquid upwards flows by this passage; From extend passage 135 terminal bifurcateds and and the first stream r1 that is connected of the cooling jacket 136 of cylinder head one side; And the second stream r2 that is connected with the cooling jacket 116 of cylinder block one side.

Shown in Figure 11 and 12, when joined wall part 137 overlays on the outer wall 117 of left side, the perforate m that forms has horizontal width L1 and the vertical width L2 close with Vertical location part 352, wherein this vertical width is meant the width that extends to the joined wall part 137 that perforate m faces, and perforate m forms approximate rectangular shape.As shown in Figure 11, particularly, the lower edge part m1 of perforate m forms the tabular lower limb part of relative narrower, thus, from lower limb part m1 and with lower limb part m1 towards joined wall part 137 gap L 2 of extending can regulate, it easily increased and reduce.

Be noted that, joined wall part 137 stacks superincumbent trench portions h, perforate m, the first and second stream r1, r2 etc. form the tributary part, and the cooling liquid that this tributary part will be discharged from water pump 113 is shunted and flow into respectively in the cooling jacket 136 of the cooling jacket 116 of cylinder block one side and cylinder head one side.

Here, the capacity of the second stream r2 can be regulated by the open area (stream zone) of perforate m, that is to say that the flow that flow into the cooling liquid in the cooling jacket 136 of the cooling jacket 116 of cylinder block one side and cylinder head one side can be conditioned so that its increase or minimizing.

For example, extend to the gap of the joined wall part of facing with lower limb part m1 (shown in two point dotted line among the figure) 137 by minimizing, the lower limb part m1 of perforate m forms has vertical width L2 ' time, the quantity of cooling liquid that flow into the cooling jacket 116 of cylinder block one side will reduce, thus, the quantity of the cooling liquid of the cooling jacket 136 of inflow cylinder head one side will increase, with the cooling effectiveness of the cooling jacket 136 that improves cylinder head one side, reduce the cooling effectiveness of the cooling jacket 116 of cylinder block one side simultaneously.

The joined wall part 137 of cylinder head 103 overlays on the joined wall part 118 (upper wall) by packing ring 138.Annular outer wall 139 is to form continuously from the vertically extending mode of the circumferential edges of joined wall part 137, midfeather 141 (with reference to Figure 10) is arranged on the inner wall section of outer wall 139 in irregular mode, thus, the cooling jacket 136 of cylinder head one side is formed between midfeather 141 and the joined wall part 137, wherein, midfeather is positioned at the upper end, and joined wall is positioned at the lower end.The cooling jacket 136 of cylinder head one side forms in the mode of not disturbing valvetrain system and ignition system (all not shown among the figure).As shown in Figure 13, recess walls 1371 is formed on the joined wall part 137 of the cylinder head 103 of each cylinder S, so that on recess walls 1371, be formed for installing the suction port and the relief opening p1 of intake ﹠ exhaust valves (not shown), and the mounting hole p2 of spark plug (not shown).

The cooling jacket 136 of cylinder head one side is formed on the cooling channel of vertical X extension of motor, and through hole 140 (with reference to Fig. 7 and Figure 13) is formed at a wherein side of the joined wall part 137 of an end.When joined wall part 137 overlayed on the joined wall part 118, the through hole 140 and the first stream r1 were connected, and the cooling liquid of water pump 113 discharges flows into through holes 140 by extending passage 135 thus.In addition, exhaust port 142 is formed at the near zone of the other end (right-hand side among Fig. 7 and Fig. 8) of the joined wall part 137 of cylinder head 103, be used to make cooling liquid to flow to the cooling jacket 136 of cylinder head one side from the opening side of the upper end of the cooling jacket 116 of cylinder block one side, thus, the cooling liquid that flows through the cooling jacket 136 of cylinder block one side along vertical X of motor is imported into the cooling jacket 136 of cylinder head one side, and the discharge route on the outer wall 139 on being formed at cylinder head opposite side (right-hand side Fig. 7 and Fig. 8) 126 flows out then.

Just as shown in Figure 7 and Figure 8, the discharge route 126 that is arranged on the opposite side (right-hand side among Fig. 7 and Fig. 8) is connected by upper channel on its end 114 and radiator 109, and is connected by first suction chamber 123 of another discharge route (heater passage) and temperature-adjusting device 112.

The operation of described engine-cooling system before this will be described below.

Shunted in discharge route 1132 and extension passage 135 backs from the cooling liquid that inlet channel 132 sucks by water pump 113 by chain case one side, flow into the cooling jacket 136 of cylinder head one side respectively by the first stream r1, and flow into the cooling jacket 116 of cylinder block one side by the second stream r2.

The cooling liquid stream n1 that has cooled off the flame contact surface near zone of air inlet and relief opening and each cylinder ignition system successively directly flows to discharge route 126.Cooling liquid stream n2 in the cooling jacket 116 of shunting back inflow cylinder block one side flows along vertical X of motor, cool off the outer peripheral areas of each cylinder S simultaneously, after wherein each cylinder outer peripheral areas of opposite side is cooled off, flow to the cooling jacket 136 of cylinder head one side from exhaust port 142, flow to discharge route 126,151 then.The stream cross section of discharge route 126 is set to the stream cross section greater than discharge route 151.

Like this, when motor heats, cause coolant temperature lower, temperature-adjusting device 112 opens heat tunnel 127 and cuts out cooling passage 128, thus, passes through heater 150 from the cooling liquid that discharge route 151 flows into, and turns back to water pump 113 then.After motor heats fully, cause coolant temperature higher, by opening cooling passage 128, the cooling liquid that flows into from discharge route 126 turns back to water pump 113 then at radiator 109 distribute heats.

In such cooling system,, can regulate the turnover rate (flow) of the cooling liquid that flows in the cooling jacket 116 of the cooling jacket 136 of cylinder head one side and cylinder block one side according to the size in the stream zone of perforate m.

For example, when this cooling system be applied to standard do not have the motor of turbosupercharger the time, shown in two point dotted line among Figure 12, the lower limb part m1 of opening m forms has vertical width L2 '.In this case, by reducing the cooling effectiveness that cooling liquid measure in the relative cylinder head of cylinder block reduces cooling system, thus, can prevent the undue cooling of cylinder head, and by increasing the cooling of cylinder head, the suction efficiency of air inlet or air will improve.

On the contrary, when cooling system according to the present invention was applied on the turbogenerator that turbosupercharger is housed on it, shown in the solid line among Figure 12, perforate m lower limb part m1 forms had vertical width L2.In this case, the amount that flows into the cooling liquid of cylinder block in the cooling system increases, thereby improves cooling rate, thus, can prevent from cylinder block is heated to higher temperature.

Like this, even when the attribute of motor 1 different and when causing different cooling performances, the cooling attribute liquid of cooling system can be adjusted, the vertical width L2 of lower limb part m1 by regulating perforate m, make its increase and minimizing, make the cooling system that is used for model engine and turbogenerator all can normally move.Can easily be applied in the various motors with different cooling performances and simple structure according to cooling system of the present invention thus, and need not increase cost.

In addition, perforate m, the structure of the component of formations such as the first and second stream r1, r2 can be simplified, and component can be installed in the outer wall 117 of cylinder block thus, and can easily obtain component structure and installing space.And, only, make its increase and minimizing by regulating the zone of perforate m, i.e. coolant rate in the cooling jacket 136 of can regulate inflow cylinder head one side and the cooling jacket 116 of cylinder block one side, and can adopt simple structure, thus prevent to increase cost.

And because perforate m has constituted the part that the trench portions of the rear end outer wall 117b of cylinder block 102 forms the position, so perforate m can repair by machining.

Thus, gap L 2 can be adjusted, it is relatively easily increased and reduce, therefore, the coolant rate that flow in the cooling jacket 116 of the cooling jacket 136 of cylinder head one side and cylinder block one side can easily be regulated, make its increase and minimizing, thus, cylinder block 102 and cylinder head 103 can be cooled off by an amount of cooling liquid respectively.

Simultaneously, in this embodiment, in engine-cooling system shown in Figure 7, trench portions h forms the second stream r2, perforate m is by overlaying joined wall 137 on the joined wall part 118, rather than the second stream r2 relative with joined wall part 137 goes up and forms, that is to say, pass the inside of the joined wall part 118 at outer wall section 117b place, rear end, make its can with the first stream r1 bifurcated, and this first stream and Vertical location part 352 are connected, and equally in this case, can obtain function and the advantage similar substantially to engine-cooling system shown in Figure 7.

In addition, lower limb part m1 parallels and forms with the upside of cylinder block substantially, and simultaneously, lower limb part m1 also can to the right or be tilted to the left.In this case, the cooling liquid stream that also flows into cooling jacket from the main passage bifurcated subsequently can laterally be shunted in cooling jacket, and the cooling liquid measure of Liu Donging can further be changed like this.

Among the described in the above embodiment, electric water pump can be used in the engine-cooling system shown in Figure 7, water pump can drive by the rotation that receives bent axle, in this case, also can obtain function similar to the engine-cooling system shown in Fig. 7 and advantage.

In the above-described embodiment, engine-cooling system according to the present invention is that example is described to be used for petrol engine 1, certainly, also can apply to diesel engine according to engine-cooling system of the present invention.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All in the spirit and principles in the present invention, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. an engine-cooling system comprises the suction port (44) that is formed on the cylinder head (3), is fed into described suction port from the cooling liquid of water pump (13); And cylinder head bolt boss (46), be positioned at suction port (8) near, be used for the cylinder head bolt that described cylinder head (3) is fixed on the cylinder block (2) is passed through described cylinder head bolt boss with matching, described engine-cooling system is characterised in that and comprises:

Suction chamber (44A), separate by the outer wall of the outer wall of described cylinder head bolt boss (46), described suction port (8) and the inwall of described cylinder head (3), to such an extent as to described suction chamber and described cylinder head bolt boss (46) and the adjacent setting of described suction port (8), and described cooling liquid is introduced in described suction chamber from described suction port (44);

First stream (47) is formed between described cylinder head bolt boss and the described suction port, so that it is mobile along the outer wall of described suction port (8) to be incorporated into the described cooling liquid of described suction chamber (44A); And

Second stream (48) is formed between the inwall of described cylinder head bolt boss and described cylinder head (3), so that it is mobile along the inwall of described cylinder head (3) to be incorporated into the described cooling liquid of described suction chamber.

2. engine-cooling system according to claim 1 is characterized in that, the cross sectional area of described second stream (48) is set at the cross sectional area greater than described first stream (47).

3. engine-cooling system according to claim 1 is characterized in that also comprising:

Main passage (135), the cooling liquid of discharging from described water pump (113) can flow into described main passage, and is used for described cooling liquid is directed into described suction port (44) from described cylinder block (102);

Cooling jacket (116), the skin of a plurality of cylinders (S) that go up to form along described cylinder block (102) and forming;

Partition wall (117b) is used for described main passage and described cooling jacket are separated; And

Splitter section (m), it cuts away described partition wall by the upper surface from described cylinder block and forms, so that the described cooling liquid of part that flows in described main passage (135) is directed to described cooling jacket (116).

4. engine-cooling system according to claim 3 is characterized in that, comprises a plurality of bolts hole (A) that are formed at described cylinder block (102) top, and described cylinder head bolt can pass through described a plurality of bolts hole; In addition, described main passage (135) are positioned near the described bolt hole foremost of described cylinder block (102), and this place is provided with chain case.

5. engine-cooling system according to claim 4, it is characterized in that, described main passage (135) at least by described bolt hole form the place the arch outer wall, constituted along the outer wall and the described partition wall (117b) of the longitudinal extension of described cylinder block (102).