CN1210937A - Cooler for water cooling internal combustion engine - Google Patents

Abstract

Cooler for water cooling internal combustion engine, a cooling water pump 50 is arranged on a cylinder 4 or a cylinder head part composed of a cylinder head 5 and a cylinder head cover 6, for press-feeding cooling water to cooling water jackets 44, 45 formed on the cylinder 4 or the cylinder head 5 of an internal combustion engine. A radiator 30 is arranged within a height range determined by the cooling pump 50 on an axis of the cylinder and the cooling water jackets 44, 45. The radiator 30 is directly attached to the cylinder 4 or the cylinder head part. To shorten a cooling water passage, reduce passage resistance, downsize a cooling water pump and reduce the number of items by arranging the cooling pump, cooling water jackets and a radiator in an adjacent range in a cooling system for an internal combustion engine.

Description

The cooling unit of water-cooled engine

The present invention relates to the cooling unit of the less water-cooled engine of a kind of air displacement (for example being equipped on the two-wheeled water-cooled engine that waits dilly), particularly relate to and a kind of cooling waterpump is formed at the cooling jacket of cylinder or cylinder cap and the cooling unit that the configuration relation between radiator has carried out the water-cooled engine of careful processing.

In the cooling unit of this water-cooled engine of prior art, the outside by the altitude range of cooling waterpump and cooling jacket decision of radiator on cylinder-bore axis is configured in an opposite side (with reference to Japanese patent gazette reality fair 6-48099 number) with clipping bent axle.

Therefore, the circulation path of cooling water is elongated, the intricately bending, and passage resistance increases, and in order to overcome this passage resistance, it is big that the capacity of cooling waterpump becomes, and cooling waterpump maximizes.

The present invention relates to solve the improvement of the water-cooled engine cooling unit of the problems referred to above, the present invention program 1 provides a kind of cooling unit of water-cooled engine, it is characterized in that: be used for being located at cylinder or cylinder cap to the cooling waterpump of the cooling jacket force feed cooling water that is formed at cylinder of internal-combustion engine or cylinder head, radiator is located in the altitude range by the decision of above-mentioned cooling waterpump and above-mentioned cooling jacket on the above-mentioned cylinder-bore axis.

Because having as described above, the present invention's the 1st scheme constitutes, so cooling waterpump, the cooling jacket that is formed at cylinder or cylinder head and radiator more closely dispose, the circulation path of cooling water shortens, and become simple, passage resistance reduces, so can reduce the capacity of cooling waterpump, can make the cooling waterpump miniaturization.

In addition, because the circulation path of cooling water shortens and becomes simple, so can cut down components number such as employed pipe, flexible pipe, band.

In addition, according to the present invention program 2 formation, can further obtain the present invention program 1 effect as described above.

According to the present invention program 3 formation, the walking wind at direction rear contacts radiator with good wind owing to can make in the past, so the cooling water in the radiator is effectively cooled off.Owing to below radiator, dispose cylinder block, can protect radiator not to be subjected to the damage of the slungshot of escort vehicle walking.

Fig. 1 is the perspective illustration that has used the water-cooled engine of the water-cooled engine cooling unit among the embodiment who puts down in writing among the present invention program 1～3.

Fig. 2 is the right side view of Fig. 1.

Fig. 3 is the vertical profile planimetric map of the III-III line along Fig. 2.

Fig. 4 is the local expanded view of Fig. 3.

Fig. 5 is that the V of Fig. 2 is to view, for cutting the front view of a part.

Fig. 6 is the left side view that cuts a part of Fig. 1.

Fig. 7 is the vertical profile planimetric map of the cooling unit of the water-cooled engine among other embodiment (embodiment 2) who puts down in writing among the present invention program 1～3.

Below, the embodiment (embodiment 1) who puts down in writing among the present invention program 1～3 shown in Fig. 1～Fig. 6 is described earlier.

Fig. 1 is the perspective illustration of water-cooled engine that has used the water-cooled engine cooling unit of present embodiment 1.Overhead camshaft type 4 stroke cycle (claiming 4 strokes usually) single-cylinder water-cooling formula internal-combustion engine 1 is equipped on the vehicle body of not shown equipment of small motor cart, is positioned in the middle of its front and back wheel.

Water-cooled engine 1 by about the crankcase 2,3 cut apart, cylinder block (cylinder) 4, cylinder head 5, and cylinder cover cap 6 is formed.Overlap cylinder block 4 at the front end of crankcase 2,3, and the central axis of cylinder-bore 7 that makes cylinder block 4 is substantially towards horizontal the place ahead; Further overlap the cylinder cap that constitutes by cylinder head 5 and cylinder cover cap 6 successively in the place ahead of cylinder block 4.These crankcases 2,3, cylinder block 4, cylinder head 5 and cylinder cover cap 6 mutually combine and are integral.

As shown in Figure 3 and Figure 4, cylinder cover cap 6 is lower than the position of another attachment face (parting surface) 66 of the mounting point that is formed at aftermentioned camshaft 18 at the attachment face (parting surface of cylinder cover cap 6) 65 of cylinder head 5, and cylinder cover cap 6 is by being engaged in cylinder head 5 integratedly along the many bolts 67 that circumferentially are configured in 65 ones of this attachment faces.

Like this, make the axis of camshaft 18 connect the sidewall of cylinder cover cap 6, this breakthrough part of left sidewall in the figure of cylinder head 6 forms the mounting hole 68 of cooling waterpump 50 described later, and this left sidewall outer 69 is as the attachment face of this cooling waterpump 50.

As shown in Figures 3 and 4, piston 8 is flush-mounted in cylinder-bore 7 slidably, bent axle 9 is supported on left and right sides crankcase 2,3 pivotally, the two ends of on this piston 8 and bent axle 9, supporting connecting rod 12 pivotally by wrist pin 10 and crankpin 11, when piston 8 to-and-fro motion, bent axle 9 also is driven and turns round.

Form inlet hole 14 and the exhaust port 15 that is communicated to cylinder-bore 7 top combustion chamber 13 respectively in cylinder head 5, suction valve 16 and outlet valve 17 are set respectively at this inlet hole 14 and exhaust port 15 freely openable ground.

Be adjacent to suction valve 16 and outlet valve 17 tops ground configuration camshaft 18 on cylinder head 5 tops, but this camshaft 18 passes through bearing 19 free rotaring ground supportings between cylinder head 5 and cam pedestal 20, the left end wide diameter portion 18a of this camshaft 18 integratedly setting-in driven sprocket 21, and bent axle 9 all-in-one-piece driving sprocket wheels 22 and driven sprocket 21 between, set up endless chain 23, camshaft 18 is by with half rotating speed driving rotational of bent axle 9, and above-mentioned suction valve 16 and outlet valve 17 just are driven respectively and open and close 1 time whenever bent axle 9 changes 2 circles.

As Fig. 2, Fig. 5 and shown in Figure 6, be configured in the top of cylinder block 4 as the radiator 30 of the cooling unit heat unit that is used for cooling water cooled internal combustion engine 1.This radiator 30 is by the cooling water tank 31 of the left and right sides, 32 (just in time opposite about in Fig. 5), towards the vehicle body fore-and-aft direction and along a plurality of planar radiating fin 33 of vertical surface parallel configuration, and connect above-mentioned cooling water tank 31 along the overall width substantially horizontal, 32 inwall in opposite directions and radiating fin 33, section is that circular coolant guide pipe 34 (is listed as above-below direction row 3, at fore-and-aft direction row 2 row or 3 row) constitute, at cooling water tank 31,32 bottom surface 31a (is shown in Fig. 6, the bottom surface of not shown cooling water tank 32) form the cooling water opening 35 of coming in and going out, this cooling water come in and go out opening 35 towards below protrude setting-in and adapter sleeve 38.

Bolt 47 perforations and cooling water tank 31,32 bottom all-in-one- piece flanges 36,36 screwed joint securely are installed on cylinder block 4 by this bolt 47 with this radiator 30 in radiator support 40,41 described later.In addition, can freely install and remove the ground setting-in at the top of cooling water tank 32 and covers 39.

Shown in Fig. 3 and 4, cylinder block 4 to the left and right two sides integratedly projection radiator support 40,41 is set, at this radiator support 40,41 cooling water path 42,43 is set, right side cooling water path 43 in this cooling water path 42,43 is communicated with the cylindric cooling jacket 44 that surrounds firing chamber 13 peripheries, also be provided with the cooling jacket consistent with the opening end of cooling jacket 44 45 in cylinder head 5, these cooling jackets 44,45 form the tiny shape in section the place ahead inwards from the mating face of cylinder block 4, cylinder head 5.

The cooling water path 42 in left side is the opening portion setting-in lower end that coupling sleeve 38 above it, links cooling water tank 31 by this coupling sleeve 38.

By above explanation and Fig. 3, Fig. 4 as can be known, the mounting point of radiator 30 is set like this, that is, on cylinder-bore 7 central axis of cylinder block 4 by in cooling waterpump 50 and cooling jacket 45,44 altitude ranges that determined, they are configured as close as possible.

As shown in Figure 3 and Figure 4, the central part of the left end wide diameter portion 18a of camshaft 18 forms recess 18b from end face, circumferentially equally spaced disposes a plurality of permanent magnets 24 on the inner peripheral surface edge of this recess 18b.

By the cooling waterpump 50 of camshaft 18 driving rotational by partition wall (pump case) 51, pump cover 52, and impeller 54 formations that in the 51a of the rotor accommodation section of this partition wall 51, are supported on partition wall 51 and pump cover 52 pivotally by supporting axle 53, outer circumferential face at the axial region 54a of this impeller 54, rotor accommodation section 51a by partition wall 51 is along the relative permanent magnet 55 of the permanent magnet 24 that a plurality of and camshaft 18 circumferentially are set integratedly, by these permanent magnets 55,24 form the magnetic shaft coupling, the axial region 54a of the impeller 54 of cooling waterpump 50 magnetically is engaged in camshaft 18, echo mutually with the revolution of this camshaft 18, impeller 54 is driven revolution.

The partition wall of cooling waterpump 50 (partition wall of magnetic shaft coupling) 51 is formed by resin materials such as PPS, the large-diameter portion of rotor accommodation section 51a cardinal extremity is fitted to the pump erection opening 68 that is formed at cylinder cover cap 6 left sidewalls, is held on these cylinder cover cap 6 left sidewalls and pump cover 52 ground and installs.

As shown in Figure 6, the lower opening 42a of the cooling water path 42 of the suction portion 56 of cooling waterpump 50 by being communicated in left radiator support part 40 connecting tube 46, as shown in Figure 4, the exhaust port 57 of cooling waterpump 50 is communicated in the drain passageway 58 (by partition wall 51 obturations) of pump cover 52, be inlaid in the access 59 and the access 60 that is communicated in the cooling jacket 45 of cylinder head 5 of the partition wall 51 that is communicated in this drain passageway 58 the two ends watertight of connecting tube 61, cooling water in the left cooling water tank 31 of radiator 30 is by the cooling water path 42 of left radiator support 40, connecting tube 46 and suction portion 56 are drawn in the cooling waterpump 50, by the cooling water of impeller 54 pressurization of cooling waterpump 50 by drain passageway 58, access 59, connecting tube 61 and access 60 are discharged to cooling jacket 45 from discharge portion 57, cooling jacket 44.

In this form of implementation 1, connecting tube 61 is embedded in the hole 63 in access 59 sides, and this hole 63 is formed at cylinder head 5 outer side walls that surround transmission mechanism compartment 62, thus also can watertight ground supporting connecting tube 61.This connecting tube 61 also can form as one with the partition wall 51 of cooling waterpump 50.

As shown in Figure 3 and Figure 4, idler sprockets (idle pulley) 25 in setting-in and endless chain 23 engagements freely to rotate of the periphery of connecting tube 61, as shown in Figure 6, in the position of leaning on bent axle 9 from idler sprockets 25, by pin 26 idler sprockets 27 is fixed on the cylinder block 4, near bent axle 9, is provided with idler sprockets 28,29 from clamping endless chain 23 ground up and down.

As shown in Figure 6, be configured in field in the transmission mechanism compartment 62 that is used to accommodate endless chain 23, that surround by the walking path of this endless chain 23 connecting tube 61, so, the idler sprockets 25 that is inlaid in these periphery also is configured in the same field connecting tube 61, therefore, idler sprockets 25 is in states inboard from the walking path of endless chain 23 and these endless chain 23 engagements.

Because present embodiment 1 has aforesaid formation, so can produce following effect.

When water-cooled engine 1 enters running state, drive and magnetically to be engaged in corresponding water-cooled engine 1 operation and during impeller 54 revolutions of the cooling waterpump 50 of rotating camshaft 18, pass through coupling sleeve 38 by the cooling water in the left side cooling water tank 31 of radiator 30 coolings, the cooling water path 42 of radiator support 40, and connecting tube 46 is drawn into the suction portion 56 of cooling waterpump 50 from cooling water discrepancy opening 35, drain passageway 58 is passed through from the discharge portion 57 of cooling waterpump 50 in impeller 54 pressurization backs by cooling waterpump 50, access 59, connecting tube 61 and access 60 are discharged to water jacket 45,45, this cooling jacket 45, cooling water in 44 is sent in the cooling water tank 32 on right side from the cooling water path 43 of the radiator support part 41 on right side, return in the cooling water tank 31 of left side by coolant guide pipe 34, like this, cooling water circulates in cooling water system.

When not shown equipment of small motor cart is walked, in the past the radiating fin of the walking wind at direction rear by radiator 30 is 33, by flow through being heated of coolant guide pipe 34 the radiating fin that cooling water heated 33 by the heat radiation of this walking wind, the cooling waters in the coolant guide pipe 34 are cooled off by the heat radiation of this radiating fin 33.At this moment, owing to radiating fin 33 disposes along the vertical direction, so utilize the heat radiation of natural convection to carry out effectively.

Radiator 30 is configured in the altitude range by cooling waterpump 50 and cooling jacket 45,44 decisions on the cylinder-bore axis, and be directly installed on cylinder block 4 in the position of radiator support 40,41, so, cooling waterpump 50, the cooling jacket 44,45 that is formed at cylinder block 4 and cylinder head 5 and radiator 30 more closely dispose, the result, and the circulation path of cooling water shortens, and become simple, passage resistance reduces, so can reduce the capacity of cooling waterpump 50, makes its miniaturization.

In addition, because the cooling water flow path shortens and becomes simply, so can cut down part count such as the pipe that is used in therebetween, flexible pipe, band.

In addition, because the central axis of the cylinder-bore 7 of cylinder block 4 is configured towards horizontal the place ahead substantially, radiator 30 directly is located at the top of cylinder block 4 with installing, so, the walking wind at direction rear is with good wind contact radiator 30, the cooling water in the cooling radiator 30 effectively in the past.

In addition, owing to below radiator 30, dispose cylinder block 4, can protect radiator 30 not to be subjected to the damage of the slungshot of escort vehicle walking.

Below, other embodiment (embodiment 2) who is put down in writing in the 1st～3 scheme of explanatory drawing 7 and invention shown in Figure 8.In these figure, the same parts of the part corresponding with embodiment 1 is represented with same-sign.

In present embodiment 2, embodiment 1 cooling waterpump 50 moves to the height and position of the firing chamber 13 of aftermentioned cylinder block 70 substantially, is here disposed as cooling waterpump 80.

Also be, cooling waterpump 80 with the large-diameter portion watertight of its partition wall (pump case) 81 be entrenched in the pump erection opening 71, by the bottom that the wall of the cover 72 of coating gas cylinder body 70 left surfaces supports the minor diameter of this partition wall 81, this pump erection opening 71 is formed at the cylinder of cylinder block 70 and the left side wall in Fig. 7 of cylinder head considerable part.

Pump erection opening 71 extends along crossing 13 ground, firing chamber up and down with its upper-lower position, and in abutting connection with cylinder chamber and exhaust port 15.Therefore, cooling waterpump 80 is provided with the position has covered cooling jacket 73 on above-below direction formation position.

Endless chain 23 is wherein being accommodated as transmission mechanism compartment 62 in space between cylinder block 70 and the cover 72.Surround the walking driving rotational of the driven sprocket 83 of the minor diameter of cooling waterpump 80 partition walls 81 and the band permanent magnet that can dispose freely to rotate, and then rotate by the axial region 85a that the revolution of this driving sprocket wheel 83 drives the impeller 85 of magnetic shaft coupling type cooling waterpump 80 by this endless chain 23.Driven sprocket 83 can be bearing in the bearing portion of cover 72 freely to rotate by bearing 84.Symbol 82 is the supporting axle of cooling waterpump 80, and this supporting axle 82 can be inserted the axial region 85a of logical impeller 85 freely to rotate.

Cylinder block 70 is formed by the cylinder in the common internal-combustion engine, cylinder head and cylinder cover cap integrator, cylinder cover cap considerable part at an upper portion thereof forms 2 bearing holes 74,75 of size, but be used for by bearing 19 free rotaring ground supporting camshafts 18, in these bearing holes 74,75, insert the assembly body of camshaft 18, position fixing by fixed block 76 relative cylinder block 70 from the left of Fig. 7.At the left end of camshaft 18, one is equipped with the driven sprocket 21 by endless chain 23 driving rotational.

The right flank of cylinder block 70 covers (not shown details) partly by cover 77, and the radiating fin formation 77a of portion of this cover 77 is recessed, constitutes the part of cooling jacket 73 walls.In addition, be formed with the inlet air pathway 14a that links inlet hole 14 at cover 77.

In present embodiment 2, radiator 90 has top and the bottom case 92,91, these top and the bottom casees 92,91 are connected by many coolant guide pipes 94, with laminated the radiating fin of being made up of the multi-disc tabular body 93 is installed at these many coolant guide pipes 94, and is connected this radiating fin 93 by these coolant guide pipes 94.

Upper tank 92 is communicated to the drain passageway 86 of cooling waterpump 80 by connecting tube 96 with fluid, lower tank 91 by not shown connecting tube with fluid be communicated to cooling jacket 73, be the part of left and right sides opposition side with drain passageway 86 substantially.

Radiator 90 2 places, front and back of its lip part 95 and about 2 places directly be installed to cylinder block 70 by bolt 47, fixed securely.

Therefore, when water-cooled engine 1 enters running state, the endless chain 23 that is turned round walking by the operation of corresponding water-cooled engine 1 drives driven sprocket 83 revolutions, and then drive magnetic engagement in the axial region 85a of the impeller 85 of the cooling waterpump 80 of this driven sprocket 83, make impeller 85 revolutions, so, the cooling water that is heated in cooling jacket 73 and becomes high temperature is attracted and pressurization by this cooling waterpump 80, flow through drain passageway 86, flow through then in connecting tube 96, flow into upper tank 92.

The cooling water that flow into upper tank 92 separately flow in the many coolant guide pipes 94, is dispelled the heat effectively by radiating fin 93 by walking wind, flow into lower tank 91.The cooling water that flow into lower tank 91 is then by turning back to cooling jacket 73 not shown connecting tube, and cooling water circulates in cooling water system.

Others are owing to identical substantially with embodiment 1, so save its detailed description.

Present embodiment 2 is owing to adopted above-mentioned formation, so radiator 90 is provided with in the altitude range that is determined by cooling waterpump 80 and cooling jacket 73 on the cylinder-bore axis, and because cooling waterpump 80 and cooling jacket 73 dispose or are formed at the equal height position, so compare with embodiment 1, these cooling waterpumps 80, cooling jacket 73, radiator 90 very closely disposes, the result, the circulation path of cooling water is (by pump drain passageway 86, connecting tube 96, not shown connecting tube and not shown pump suck path and form) very short, and it is simple, passage resistance reduces significantly, so can further reduce the capacity of cooling waterpump 80, further make its miniaturization.

Because the cooling water flow path becomes very short, and simple, so can further cut down component numbers such as employed pipe, flexible pipe, band.In addition, can also obtain the effect identical with embodiment 1.

Claims (3)

1. the cooling unit of a water-cooled engine, it is characterized in that: be located at cylinder or cylinder cap to the cooling waterpump that is formed at the cooling jacket force feed cooling water on cylinder of internal-combustion engine or the cylinder head, radiator be located on the above-mentioned cylinder-bore axis, in the altitude range by the decision of above-mentioned cooling waterpump and above-mentioned cooling jacket.

2. the cooling unit of water-cooled engine as claimed in claim 1 is characterized in that: above-mentioned radiator is directly installed and is arranged at above-mentioned cylinder or above-mentioned cylinder cap.

3. the cooling unit of water-cooled engine as claimed in claim 2 is characterized in that: above-mentioned cylinder is substantially towards the substantially horizontal setting, and above-mentioned radiator is directly installed the top that is arranged at above-mentioned cylinder.

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