CN206206006U - Engine cooling water jacket structure and straight arrangement double-cylinder engine cooling water jacket structure - Google Patents

Abstract

The utility model discloses a kind of engine cooling water jacket structure and straight arrangement double-cylinder engine cooling water jacket structure, to two cylinders or at least, the engine of two cylinders carries out cooling down for it, include casing water jacket, block jacket, cylinder head jacket and outlet water jacket, wherein, casing water jacket by cooling water inlet through bottom water jacket upwards successively through block jacket, cylinder head jacket after, finally meet at the outlet water jacket of engine charge side.It is laid out by the cooling water between casing water jacket, block jacket, cylinder head jacket and outlet water jacket in engine housing, cylinder body and cylinder cap the week side of boss, cooling evenly between the cylinder of engine two or multi-cylinder can be realized, reduce engine interior thermal stress, improve functional reliability.

Description

Engine cooling water jacket structure and straight arrangement double-cylinder engine cooling water jacket structure

Technical field

The utility model is related to a kind of engine cooling water jacket structure and straight arrangement double-cylinder engine cooling water jacket structure, belongs to Engine cool technical field.

Background technology

When engine works, the part contacted with high-temperature fuel gas will produce larger thermal stress, thermal deformation and due to overheat The caused part performance reduction even situation such as failure, this will cause abrasion aggravation, engine efficiency to decline, work abnormal etc. The serious consequence of influence engine stabilization and reliability.Engine-cooling system by engine for receiving high-temperature heating Parts are cooled in permission temperature range, allow the accessory system that engine work is indispensable.

The cooling effect of water-cooling system is preferable, and as the improvement of jacket structure for water has larger cooling potential, therefore its With wider.The water-cooling system at initial stage is single cycle water-cooled, i.e., directly pump into engine by water pump by the cooling water of radiator Body is cooled down, and is then returned directly to radiator.Under any operating mode, cooling water is intended to by radiator this kind of water-cooling system Cooling, can cause the problem of sub-cooled under some conditions, and then influence engine emission and oil consumption.This structure is changed It is to increase thermosistor between engine body delivery port and water pump water inlet to enter scheme, cold during operation with the change of operating mode But system is in systemic circulation or partial circulating state.

Although improvement project eliminates supercooling, as single cycle water-cooling project, when engine is twin-tub or multi-cylinder, Because the fluidal texture of cooling system is, the water after being cooled down through radiator pumps into cylinder body entrance and sequentially enters each cylinder by water pump Side diversion channel, then each cylinder diversion channel cooling water is cooled down through head gasket water hole into corresponding cylinder cap respectively, and difference Each cylinder opposite side water channel is returned to by respective cylinder pad water hole, finally converge into one via thermosistor be assigned to cylinder body entrance or Return to radiator.This flow of cooling water structure or water jacket are arranged, most directly have the disadvantage each gray iron can be caused to cool down Flow quantity is difficult to Balance route, and the cooling liquid speed uniformity in water jacket is poor, and then the uniformity and cooling that each cylinder is cooled down Can be inconsistent, or even there is the phenomenon of some cylinder undercoolings and other cylinders cooling deficiency.

The content of the invention

For above-mentioned weak point of the prior art, the utility model aims to provide a kind of engine cooling water jacket knot Structure, for eliminating cylinder block between cooling water flow, velocity flow profile difference, multi-cylinder is obtained basically identical cooling condition and cooling Effect, eliminates the Temperature Distribution difference between multi-cylinder, improves the stability and reliability of engine.

To achieve these goals, the technical solution of the utility model：A kind of engine cooling water jacket structure, to being at least The engine of two cylinders is cooled down, and it includes casing water jacket, block jacket, cylinder head jacket and outlet water jacket, wherein,

The casing water jacket forms cooling water inlet by the exhaust side of engine, the bottom of the cooling water inlet and casing water jacket Water jacket is connected, and the bottom water jacket leads to the block jacket and forms casing main channel by exhaust side of engine outside, and The block jacket is formed with throttle orifice with the casing water jacket contact position, and the casing water jacket is started by throttle orifice edge Machine exhaust side inner side is formed with casing tributary waterway, and the casing main channel, casing tributary waterway lead to hair by horizontal pipeline section respectively In the corresponding water tank of motivation air inlet side, have with the water tank that the casing tributary waterway is connected and be connected with the bottom water jacket downwards The vertical pipeline section of logical casing, and cylinder block passage of each water tank upwards with the block jacket be connected；

Cylinder block main channel, cylinder block tributary waterway, the gas are respectively formed with by the throttle orifice in the block jacket Cylinder body main channel, cylinder block tributary waterway correspondence are connected with casing main channel, casing tributary waterway, and cylinder block main channel, the gas Cylinder body tributary waterway forms ring water channel up around engine exhaust port and on engine cylinder block top, and the ring water channel passes through Several water-supply lines are connected with the cylinder head jacket, and the ring water channel passes through the vertical pipeline section of cylinder block in engine charge side Water tank with the casing water jacket is connected；

The outlet water jacket is merged by cylinder head jacket in engine charge side.

It is laid out by casing water jacket, block jacket, cylinder head jacket and outlet water jacket cooling water on the engine, with Cooling water flow, velocity flow profile difference between cylinder block are eliminated, multi-cylinder is obtained basically identical cooling condition and cooling effect, disappeared Except the Temperature Distribution difference between multi-cylinder, the stability and reliability of engine are improved.

The utility model another object is to provide a kind of straight arrangement double-cylinder engine cooling water jacket structure, for eliminating cylinder Cooling water flow, velocity flow profile difference between body, make twin-tub obtain basically identical cooling condition and cooling effect, eliminate twin-tub it Between Temperature Distribution difference, improve engine stability and reliability.

The technical scheme：A kind of straight arrangement double-cylinder engine cooling water jacket structure, it includes preceding cylinder water jacket, rear cylinder water sleeve Outlet water jacket, the preceding cylinder water jacket includes preceding cylinder casing water jacket, preceding cylinder block jacket, preceding cylinder cylinder head jacket, it is described after Cylinder water jacket includes rear cylinder casing water jacket, rear cylinder cylinder block water jacket, rear cylinder cylinder head water jacket, wherein,

The preceding cylinder casing water jacket, rear cylinder casing water jacket by the exhaust side of engine be correspondingly formed preceding cylinder cooling water inlet, Cylinder cooling water inlet afterwards, the preceding cylinder cooling water inlet, rear cylinder cooling water inlet correspondence and the preceding cylinder casing water jacket, rear cylinder casing The preceding cylinder bottom portion water jacket of water jacket, rear cylinder bottom portion water jacket are connected；The preceding cylinder bottom portion water jacket, rear cylinder bottom portion water jacket are by engine exhaust Side outside leads to the preceding cylinder block jacket, rear cylinder block jacket and is formed with preceding cylinder casing main channel, the rear main water of cylinder casing Road, and in the preceding cylinder block jacket, rear cylinder block jacket and the preceding cylinder casing water jacket, rear cylinder casing water jacket is corresponding connects Tactile position has preceding cylinder throttle orifice, rear cylinder throttle orifice, and the preceding cylinder casing water jacket, rear cylinder casing water jacket are throttled by the preceding cylinder Hole, rear cylinder throttle orifice are formed with preceding cylinder casing tributary waterway, rear cylinder casing tributary waterway, the preceding cylinder case along exhaust side of engine inner side Body main channel, preceding cylinder casing tributary waterway, rear cylinder casing main channel, rear cylinder casing tributary waterway correspondence are by outside transverse pipe in preceding cylinder Outside transverse pipe section is led in the interior outside water tank of preceding cylinder of engine charge side, rear cylinder on the water tank of outside in section, rear cylinder, the preceding cylinder In interior outside water tank, rear cylinder outside water tank upwards with the preceding cylinder block jacket, the preceding cylinder cylinder body water of rear cylinder block jacket Road, rear cylinder cylinder block passage are connected, and preceding cylinder inner side water tank, the interior outside water tank of the rear cylinder in the preceding cylinder in the water tank of outside In rear cylinder inner side water tank respectively by the vertical pipeline section of preceding cylinder, the vertical pipeline section of rear cylinder and the preceding cylinder bottom portion water jacket, rear cylinder bottom portion Water jacket is connected；

By the preceding cylinder throttle orifice, rear cylinder throttle orifice difference shape in the preceding cylinder block jacket, rear cylinder block jacket Cheng Youqian cylinder cylinder block main channel, preceding cylinder cylinder block tributary waterway, rear cylinder cylinder block main channel, rear cylinder cylinder block tributary waterway, before this Cylinder cylinder block main channel, preceding cylinder cylinder block tributary waterway, rear cylinder cylinder block main channel, rear cylinder cylinder block tributary waterway and the preceding cylinder case Body main channel, preceding cylinder casing tributary waterway, rear cylinder casing main channel, rear cylinder casing tributary waterway correspondence are connected, and the preceding cylinder gas Cylinder body main channel, preceding cylinder cylinder block tributary waterway are up around engine exhaust port and the cylinder before engine cylinder block top forms Ring water channel, the rear cylinder cylinder block main channel, rear cylinder cylinder block tributary waterway are up around engine exhaust port and in engine Cylinder ring is to water channel after cylinder block top formation one, and the preceding cylinder ring is circumferential by several to water channel top to water channel, rear cylinder ring Preceding cylinder upper hose, rear cylinder upper hose are connected with the preceding cylinder cylinder head jacket, rear cylinder cylinder head jacket, and the preceding cylinder ring is to water Road, rear cylinder ring to water channel engine charge side by preceding cylinder cylinder block passage, rear cylinder cylinder block passage correspondence with the preceding cylinder inside and outside Outside water tank is connected in side water tank, rear cylinder；

The outlet water jacket is merged by preceding cylinder cylinder head jacket, rear cylinder cylinder head jacket in engine charge side.

Further, the crankcase inwall in the preceding cylinder bottom portion water jacket, rear cylinder bottom portion water jacket and the forward and backward cylinder of engine And sump lubrication oil correspondence cooling, and the preceding cylinder bottom portion water jacket, rear cylinder bottom portion water jacket upper surface crankcase corresponding thereto It is placed equidistant between internal wall, and is arc-shaped structure.

Further, the preceding cylinder casing main channel, preceding cylinder casing tributary waterway, rear cylinder casing main channel, rear cylinder casing branch Coolant rate is consistent in water channel；Outside transverse pipe section section is equal in outside transverse pipe section, rear cylinder in the preceding cylinder.

Further, balance pipeline section is provided between the preceding cylinder casing tributary waterway, rear cylinder casing tributary waterway, the balance pipe Preceding cylinder casing tributary waterway described in Duan Liantong and rear cylinder casing tributary waterway.

Further, the preceding cylinder ring is high to the level height of the close exhaust side of engine of water channel to water channel, rear cylinder ring In the preceding cylinder ring to water channel, level height from rear cylinder ring to other sides of water channel.

Further, have in the preceding cylinder block jacket, rear cylinder block jacket the cut-off preceding cylinder ring to water channel, Preceding cylinder breach, rear cylinder breach of the cylinder ring to water channel afterwards, the preceding cylinder breach, rear cylinder breach are near the exhaust side of engine.

Further, adjacent part forms preceding cylinder cooling water between the preceding cylinder block jacket, rear cylinder block jacket Set, rear cylinder cooling jacket, the preceding cylinder cooling jacket, the radial thickness of rear cylinder cooling jacket more than the preceding cylinder block jacket or The radial thickness of cylinder block jacket other positions afterwards.

Further, the preceding cylinder cylinder head jacket, rear cylinder cylinder head jacket cover combustion chamber in engine cylinder cover Region；The preceding cylinder cylinder head jacket, the thickness of rear cylinder cylinder head jacket are less than the preceding cylinder casing water jacket, rear cylinder casing water Set, preceding cylinder block jacket, the thickness of rear cylinder block jacket, and the preceding cylinder cylinder head jacket, rear cylinder cylinder head jacket are in hair The thickness of motivation spark plug and fuel injector near zone is less than other regions in the preceding cylinder cylinder head jacket, rear cylinder cylinder head jacket Thickness.

Further, the preceding cylinder cylinder head jacket, rear cylinder cylinder head jacket top are near the region of the outlet water jacket Upper correspondence is disposed with the cylinder exhaust pipe of small-bore, rear cylinder blast pipe.

It is laid out by casing water jacket, block jacket, cylinder head jacket and outlet water jacket cooling water on the engine, with Cooling water flow, velocity flow profile difference between cylinder block are eliminated, twin-tub is obtained basically identical cooling condition and cooling effect, disappeared Except the Temperature Distribution difference between twin-tub, the stability and reliability of engine are improved.

In sum, what this engine cooling water jacket structure can be realized between the cylinder of engine two or multi-cylinder evenly is cold But, reduce engine interior thermal stress, improve functional reliability.

Brief description of the drawings

Fig. 1 is the overall cooling water jacket structure figure of engine in the utility model；

Fig. 2 is the overall cooling jacket side block diagram of engine in the utility model；

Fig. 3 is the cylinder body water jacket side block diagram of engine in the utility model；

Fig. 4 is the cylinder body water jacket air inlet side topology view of engine in the utility model；

Fig. 5 is the topology view of the outlet water jacket of engine in the utility model.

Specific embodiment

The utility model is further described with reference to specific embodiment and accompanying drawing.

A kind of engine cooling water jacket structure as described in Fig. 1-Fig. 5, the engine to being at least two cylinders is cooled down, its Casing water jacket, block jacket, cylinder head jacket and outlet water jacket 3 are included, wherein,

Casing water jacket forms cooling water inlet by the exhaust side of engine, the bottom water jacket of the cooling water inlet and casing water jacket It is connected, the bottom water jacket leads to block jacket and forms casing main channel by exhaust side of engine outside, and in the cylinder block Water jacket is formed with throttle orifice with casing water jacket contact position, and casing water jacket is formed by the throttle orifice along exhaust side of engine inner side There is casing tributary waterway, casing main channel, casing tributary waterway lead to the corresponding water tank of engine charge side by horizontal pipeline section respectively In, the water tank being connected with casing tributary waterway have downwards with the vertical pipeline section of the casing that bottom water jacket is connected, and each water tank It is connected with the cylinder block passage of block jacket upwards；

Cylinder block main channel, cylinder block tributary waterway, the main water of the cylinder block are respectively formed with by throttle orifice in block jacket Road, cylinder block tributary waterway correspondence are connected with casing main channel, casing tributary waterway, and the cylinder block main channel, cylinder block Zhi Shui Road forms ring water channel up around engine exhaust port and on engine cylinder block top, and the ring water channel passes through several upper water Road is connected with cylinder head jacket, and the ring water channel passes through the vertical pipeline section of cylinder block with casing water jacket in engine charge side Water tank is connected；

Outlet water jacket 3 is merged by cylinder head jacket in engine charge side.

The utility model is by casing water jacket, block jacket, cylinder head jacket and outlet water jacket 3 at least two cylinders Cooling water layout is carried out on engine, to eliminate cylinder block between cooling water flow, velocity flow profile difference, multi-cylinder is obtained basic one The cooling condition and cooling effect of cause, eliminate the Temperature Distribution difference between multi-cylinder, improve the stability and reliability of engine.

The present embodiment is specifically described the utility model by taking the cooling water jacket structure of straight arrangement double-cylinder engine as an example, and other are more Cylinder is similar with its.

A kind of straight arrangement double-cylinder engine cooling water jacket structure, it includes preceding cylinder water jacket 1, rear cylinder water jacket 2 and outlet water jacket 3, the preceding cylinder water jacket 1 includes preceding cylinder casing water jacket 11, preceding cylinder block jacket 12, preceding cylinder cylinder head jacket 13, rear cylinder water jacket 2 Rear cylinder casing water jacket 21, rear cylinder cylinder block water jacket 22, rear cylinder cylinder head water jacket 23 are included, wherein,

Preceding cylinder casing water jacket 11, rear cylinder casing water jacket 21 have been correspondingly formed preceding cylinder cooling water inlet by the exhaust side of engine 111st, rear cylinder cooling water inlet 211, the preceding cylinder cooling water inlet 111, rear cylinder cooling water inlet 211 correspondence and preceding cylinder casing water jacket 11st, the preceding cylinder bottom portion water jacket 112 of rear cylinder casing water jacket 21, rear cylinder bottom portion water jacket 212 are connected；The preceding cylinder bottom portion water jacket 112, after Cylinder bottom portion water jacket 212 is led to before preceding cylinder block jacket 12, rear cylinder block jacket 22 be formed with by exhaust side of engine outside Cylinder casing main channel 113, rear cylinder casing main channel 213, and in preceding cylinder block jacket 12, rear cylinder block jacket 22 and preceding cylinder Casing water jacket 11, rear cylinder casing water jacket 21 correspondence contact position have preceding cylinder throttle orifice 312, rear cylinder throttle orifice 313, preceding cylinder casing Water jacket 11, rear cylinder casing water jacket 21 are formed by the preceding cylinder throttle orifice 312, rear cylinder throttle orifice 313 along exhaust side of engine inner side Have preceding cylinder casing tributary waterway 114, a rear cylinder casing tributary waterway 214, preceding cylinder casing main channel 113, preceding cylinder casing tributary waterway 114, after Cylinder casing main channel 213, rear cylinder casing tributary waterway 214 correspondence are interior laterally outside by outside transverse pipe section 116, rear cylinder in preceding cylinder Pipeline section 216 leads in the preceding cylinder of engine charge side on the interior outside water tank 217 of outside water tank 117, rear cylinder, outside water in the preceding cylinder In case 117, rear cylinder outside water tank 217 upwards with preceding cylinder block jacket 12, the preceding cylinder cylinder block passage of rear cylinder block jacket 22 121st, rear cylinder cylinder block passage 221 is connected, and preceding cylinder inner side water tank 117a in preceding cylinder in the water tank 117 of outside, outside in rear cylinder Rear cylinder inner side water tank 217a in water tank 217 passes through the vertical pipeline section 118 of preceding cylinder, the vertical pipeline section 218 of rear cylinder and preceding cylinder bottom portion respectively Water jacket 112, rear cylinder bottom portion water jacket 212 are connected；

Distinguished by preceding cylinder throttle orifice 312, rear cylinder throttle orifice 313 in preceding cylinder block jacket 12, rear cylinder block jacket 22 It is formed with preceding cylinder cylinder block main channel 123, preceding cylinder cylinder block tributary waterway 124, rear cylinder cylinder block main channel 223, rear cylinder cylinder block Tributary waterway 224, the preceding cylinder cylinder block main channel 123, preceding cylinder cylinder block tributary waterway 124, rear cylinder cylinder block main channel 223, rear cylinder Cylinder block tributary waterway 224 and preceding cylinder casing main channel 113, preceding cylinder casing tributary waterway 114, rear cylinder casing main channel 213, rear cylinder case The correspondence of body tributary waterway 214 is connected, and preceding cylinder cylinder block main channel 123, preceding cylinder cylinder block tributary waterway 124 are up around engine Exhaust outlet and engine cylinder block top formed one before cylinder ring to water channel 122, rear cylinder cylinder block main channel 223, rear cylinder cylinder Body tributary waterway 224 up around engine exhaust port and engine cylinder block top formed one after cylinder ring to water channel 222, preceding cylinder Ring water channel 122, rear cylinder ring to the top of water channel 222 it is circumferential by several preceding cylinder upper hoses 131, rear cylinder upper hose 231 with it is preceding Cylinder cylinder head jacket 13, rear cylinder cylinder head jacket 23 are connected, and the preceding cylinder ring is being sent out to water channel 122, rear cylinder ring to water channel 222 Motivation air inlet side is by preceding cylinder cylinder block passage 121, preceding cylinder cylinder block passage 221 correspondence and outside water tank 117 in preceding cylinder, inside and outside rear cylinder Side water tank 217 is connected；

Outlet water jacket 3 is merged by preceding cylinder cylinder head jacket 13, rear cylinder cylinder head jacket 23 in engine charge side.

As can be seen here, because heat of engine is primarily generated at exhaust side especially around blast pipe, therefore, whole cooling Jacket structure for water major part is all located at exhaust side.Preceding cylinder cooling water inlet 111, rear cylinder cooling on preceding cylinder water jacket 1, rear cylinder water jacket 2 Water inlet 211 is respectively positioned on exhaust side, and is longitudinally arranged symmetrically along two cylinders.The another preceding cylinder water jacket 1, rear cylinder water jacket 2 are in flowing side To and the upper structure of cooling water layout it is essentially identical, finally meet on the outlet water jacket 3 of engine charge side.

Preceding cylinder casing water jacket 11, rear cylinder casing water jacket 21 are the passage that coolant flows through crankcase.Preceding cylinder bottom water The cooling corresponding with the crankcase inwall in the forward and backward cylinder of engine and sump lubrication oil of set 112, rear cylinder bottom portion water jacket 212, be Lubricating oil in uniform cooling bent axle chamber interior wall and oil sump, and the preceding cylinder bottom portion water jacket 112, the upper surface of rear cylinder bottom portion water jacket 212 Be placed equidistant between crankcase inwall corresponding thereto, and be arc-shaped structure, i.e., preceding cylinder bottom portion water jacket 112, rear cylinder The upper surface of bottom water jacket 212 with bent axle chamber interior wall change in shape, such as crankcase inwall is in circular arc, then preceding cylinder bottom portion water jacket 112nd, the upper surface of rear cylinder bottom portion water jacket 212 is also in circular arc, so that the preceding cylinder bottom portion water jacket 112, rear cylinder bottom portion water jacket 212 arrive it The corresponding basic uniform thickness of crankcase inwall.

Preceding cylinder casing main channel 113, preceding cylinder casing tributary waterway 114, rear cylinder casing main channel 213, rear cylinder casing tributary waterway Coolant rate is consistent or essentially identical in 214；Similarly, on the outside of in its corresponding preceding cylinder in outside transverse pipe section 116, rear cylinder The section of horizontal pipeline section 216 is equal.And cylinder inner side water tank before outside water tank 217 is respectively in outside water tank 117, rear cylinder in preceding cylinder Water tank 217b on the outside of water tank 117b on the outside of 117a, preceding cylinder, rear cylinder inner side water tank 217a, rear cylinder, four Water in Water Tank equalitys are away from setting Put.

Wherein, outside transverse pipe section 216 and the vertical pipeline section 118 of preceding cylinder in outside transverse pipe section 116, rear cylinder in preceding cylinder, after The vertical one side of pipeline section 218 of cylinder is used for the region cooling between exhaust side and air inlet side, on the other hand for balancing air inlet side Flow velocity and pressure between water jacket and exhaust side water jacket, between inner side water jacket and outside water jacket.Preceding cylinder casing tributary waterway 114, Balance pipeline section 311 is provided between cylinder casing tributary waterway 214 afterwards, the balance pipeline section 311 connects preceding cylinder casing tributary waterway 114 with after Cylinder casing tributary waterway 214, to balance the flow velocity and pressure between two cylinders.

Preceding cylinder ring is above preceding cylinder ring to water channel 222 to water channel 122, rear cylinder ring near the level height of the exhaust side of engine To water channel 122, rear cylinder ring to the level height of other sides of water channel 222, to increase the flow velocity of exhaust side, heat is faster taken away.Before Have in cylinder block jacket 12, rear cylinder block jacket 22 the preceding cylinder ring of cut-off to water channel 122, rear cylinder ring to water channel 222 before Cylinder breach 125, rear cylinder breach 225, near the exhaust side of engine, preceding cylinder ring is to water channel for the preceding cylinder breach 125, rear cylinder breach 225 122nd, rear cylinder ring flows to exhaust side and is further continued for circumferentially flowing to exhaust from air inlet side to coolant in water channel 222 along cylinder body ring Side, and preceding cylinder breach 125, the presence of rear cylinder breach 225 so that this kind of ring type of flow can make whole cylinder body ring temperature Distribution is more uniform, to reduce cylinder body thermal stress.

And between preceding cylinder block jacket 12, rear cylinder block jacket 22 adjacent part formed preceding cylinder cooling jacket 126, after Cylinder cooling jacket 226, the preceding cylinder cooling jacket 126, the radial thickness of rear cylinder cooling jacket 226 are more than preceding cylinder block jacket 12 Or the radial thickness of the rear other positions of cylinder block jacket 22, film-cooled heat is big, thus radial thickness is more than preceding cylinder ring to water channel 122nd, rear cylinder ring is to the other parts radial thickness of water channel 222, to reduce flow velocity.

Preceding cylinder cylinder head jacket 13, rear cylinder cylinder head jacket 23 cover combustion chamber in the region of engine cylinder cover；Preceding cylinder Cylinder head jacket 13, the thickness of rear cylinder cylinder head jacket 23 are less than preceding cylinder casing water jacket 11, rear cylinder casing water jacket 21, preceding cylinder cylinder The thickness of body water jacket 12, rear cylinder block jacket 22, and the preceding cylinder cylinder head jacket 13, rear cylinder cylinder head jacket 23 are in engine The thickness of spark plug and fuel injector near zone is less than other regions in the preceding cylinder cylinder head jacket 13, rear cylinder cylinder head jacket 23 Thickness.

Finally, preceding cylinder cylinder head jacket 13, the top of rear cylinder cylinder head jacket 23 correspondence cloth on the region of outlet water jacket 3 The cylinder exhaust pipe 132 of small-bore, rear cylinder blast pipe 232 are equipped with, are used to remove the bubble in coolant.

The technical scheme that the utility model embodiment is provided is described in detail above, it is used herein specifically Individual example is set forth to the principle and implementation method of the utility model embodiment, and the explanation of above example is only applicable to side Assistant solves the principle of the utility model embodiment；Simultaneously for those of ordinary skill in the art, implement according to the utility model Example, will change in specific embodiment and range of application, and in sum, this specification content should not be construed as To limitation of the present utility model.

Claims (10)

1. a kind of engine cooling water jacket structure, the engine to being at least two cylinders is cooled down, it is characterised in that：Include case Body water jacket, block jacket, cylinder head jacket and outlet water jacket (3), wherein,

The casing water jacket forms cooling water inlet by the exhaust side of engine, the bottom water jacket of the cooling water inlet and casing water jacket It is connected, the bottom water jacket leads to the block jacket and forms casing main channel by exhaust side of engine outside, and in the gas Cylinder body water jacket is formed with throttle orifice with the casing water jacket contact position, and the casing water jacket is arranged by the throttle orifice along engine Gas side inner side is formed with casing tributary waterway, and the casing main channel, casing tributary waterway lead to engine by horizontal pipeline section respectively In the corresponding water tank of air inlet side, the water tank being connected with the casing tributary waterway has what is be connected with the bottom water jacket downwards The vertical pipeline section of casing, and cylinder block passage of each water tank upwards with the block jacket be connected；

Cylinder block main channel, cylinder block tributary waterway, the cylinder block are respectively formed with by the throttle orifice in the block jacket Main channel, cylinder block tributary waterway correspondence are connected with casing main channel, casing tributary waterway, and cylinder block main channel, the cylinder block Tributary waterway forms ring water channel up around engine exhaust port and on engine cylinder block top, and the ring water channel is by several Water-supply line is connected with the cylinder head jacket, and the ring water channel passes through the vertical pipeline section of cylinder block and institute in engine charge side The water tank for stating casing water jacket is connected；

Outlet water jacket (3) is merged by cylinder head jacket in engine charge side.

2. a kind of straight arrangement double-cylinder engine cooling water jacket structure, it is characterised in that：Include preceding cylinder water jacket (1), rear cylinder water jacket (2) And water jacket (3) is exported, the preceding cylinder water jacket (1) includes preceding cylinder casing water jacket (11), preceding cylinder block jacket (12), preceding cylinder gas Cylinder cover water jacket (13), the rear cylinder water jacket (2) includes rear cylinder casing water jacket (21), rear cylinder cylinder block water jacket (22), rear cylinder vapour Cylinder cover water jacket (23), wherein,

The preceding cylinder casing water jacket (11), rear cylinder casing water jacket (21) have been correspondingly formed preceding cylinder cooling water and have entered by the exhaust side of engine Mouth (111), rear cylinder cooling water inlet (211), the preceding cylinder cooling water inlet (111), rear cylinder cooling water inlet (211) correspondence and institute State preceding cylinder casing water jacket (11), preceding cylinder bottom portion water jacket (112) of rear cylinder casing water jacket (21), rear cylinder bottom portion water jacket (212) be connected It is logical；The preceding cylinder cylinder block is led to by exhaust side of engine outside in preceding cylinder bottom portion water jacket (112), rear cylinder bottom portion water jacket (212) Water jacket (12), rear cylinder block jacket (22) are formed with preceding cylinder casing main channel (113), rear cylinder casing main channel (213), and The preceding cylinder block jacket (12), rear cylinder block jacket (22) and the preceding cylinder casing water jacket (11), rear cylinder casing water jacket (21) correspondence contact position has preceding cylinder throttle orifice (312), rear cylinder throttle orifice (313), the preceding cylinder casing water jacket (11), rear cylinder Casing water jacket (21) is formed with preceding cylinder by the preceding cylinder throttle orifice (312), rear cylinder throttle orifice (313) along exhaust side of engine inner side Casing tributary waterway (114), rear cylinder casing tributary waterway (214), the preceding cylinder casing main channel (113), preceding cylinder casing tributary waterway (114), rear cylinder casing main channel (213), rear cylinder casing tributary waterway (214) correspondence by outside transverse pipe section (116) in preceding cylinder, Outside water tank (117) in the preceding cylinder of engine charge side, outside water tank in rear cylinder are led in outside transverse pipe section (216) in cylinder afterwards (217) on, outside water tank (117) in the preceding cylinder, in rear cylinder outside water tank (217) upwards with the preceding cylinder block jacket (12), the preceding cylinder cylinder block passage (121) of rear cylinder block jacket (22), rear cylinder cylinder block passage (221) are connected, and the preceding cylinder Rear cylinder inner side water tank in preceding cylinder inner side water tank (117a), the rear cylinder in interior outside water tank (117) in outside water tank (217) (217a) is respectively by the vertical pipeline section of preceding cylinder (118), the vertical pipeline section of rear cylinder (218) and the preceding cylinder bottom portion water jacket (112), rear cylinder Bottom water jacket (212) is connected；

Throttled by the preceding cylinder throttle orifice (312), rear cylinder on the preceding cylinder block jacket (12), rear cylinder block jacket (22) Hole (313) is respectively formed with preceding cylinder cylinder block main channel (123), preceding cylinder cylinder block tributary waterway (124), rear cylinder cylinder block main channel (223), rear cylinder cylinder block tributary waterway (224), the preceding cylinder cylinder block main channel (123), preceding cylinder cylinder block tributary waterway (124), after Cylinder cylinder block main channel (223), rear cylinder cylinder block tributary waterway (224) and the preceding cylinder casing main channel (113), preceding cylinder casing branch Water channel (114), rear cylinder casing main channel (213), rear cylinder casing tributary waterway (214) correspondence are connected, and the preceding cylinder cylinder block Main channel (123), preceding cylinder cylinder block tributary waterway (124) are formed up around engine exhaust port and on engine cylinder block top , to water channel (122), the rear cylinder cylinder block main channel (223), rear cylinder cylinder block tributary waterway (224) are up around hair for cylinder ring before one Motivation exhaust outlet and after engine cylinder block top forms one cylinder ring to water channel (222), the preceding cylinder ring to water channel (122), Cylinder ring passes through several preceding cylinder upper hoses (131), rear cylinder upper hose (231) and the preceding cylinder to water channel (222) top is circumferential afterwards Cylinder head jacket (13), rear cylinder cylinder head jacket (23) are connected, and the preceding cylinder ring to water channel (122), rear cylinder ring to water channel (222) engine charge side by preceding cylinder cylinder block passage (121), rear cylinder cylinder block passage (221) correspondence with the preceding cylinder inside and outside Outside water tank (217) is connected in side water tank (117), rear cylinder；

Outlet water jacket (3) is converged by preceding cylinder cylinder head jacket (13), rear cylinder cylinder head jacket (23) in engine charge side Form.

3. straight arrangement double-cylinder engine cooling water jacket structure according to claim 2, it is characterised in that：The preceding cylinder bottom portion water jacket (112), rear cylinder bottom portion water jacket (212) cooling corresponding with the crankcase inwall in the forward and backward cylinder of engine and sump lubrication oil, And it is equidistant between preceding cylinder bottom portion water jacket (112), rear cylinder bottom portion water jacket (212) upper surface crankcase inwall corresponding thereto Set, and be arc-shaped structure.

4. straight arrangement double-cylinder engine cooling water jacket structure according to claim 2, it is characterised in that：The preceding main water of cylinder casing Road (113), preceding cylinder casing tributary waterway (114), rear cylinder casing main channel (213), the rear interior coolant stream of cylinder casing tributary waterway (214) Amount is consistent；Outside transverse pipe section (116), interior outside transverse pipe section (216) section of rear cylinder are equal in the preceding cylinder.

5. straight arrangement double-cylinder engine cooling water jacket structure according to claim 2, it is characterised in that：The preceding cylinder casing Zhi Shui Balance pipeline section (311) is provided between road (114), rear cylinder casing tributary waterway (214), before the balance pipeline section (311) connection is described Cylinder casing tributary waterway (114) and rear cylinder casing tributary waterway (214).

6. straight arrangement double-cylinder engine cooling water jacket structure according to claim 2, it is characterised in that：The preceding cylinder ring is to water channel (122), rear cylinder ring to water channel (222) near the level height of the exhaust side of engine be above the preceding cylinder ring to water channel (122), Afterwards level height from cylinder ring to water channel (222) other sides.

7. straight arrangement double-cylinder engine cooling water jacket structure according to claim 2, it is characterised in that：The preceding cylinder cylinder block water Have the cut-off preceding cylinder ring to water channel (122), rear cylinder ring to water channel (222) in set (12), rear cylinder block jacket (22) Preceding cylinder breach (125), rear cylinder breach (225), the preceding cylinder breach (125), rear cylinder breach (225) are near the engine exhaust Side.

8. the straight arrangement double-cylinder engine cooling water jacket structure according to claim 2 or 6 or 7, it is characterised in that：The preceding cylinder gas Adjacent part forms preceding cylinder cooling jacket (126), rear cylinder cooling jacket between cylinder body water jacket (12), rear cylinder block jacket (22) (226), the preceding cylinder cooling jacket (126), the radial thickness of rear cylinder cooling jacket (226) are more than the preceding cylinder block jacket (12) or rear cylinder block jacket (22) other positions radial thickness.

9. straight arrangement double-cylinder engine cooling water jacket structure according to claim 2, it is characterised in that：The preceding cylinder cylinder head water Set (13), rear cylinder cylinder head jacket (23) cover combustion chamber in the region of engine cylinder cover；The preceding cylinder cylinder head jacket (13), the thickness of rear cylinder cylinder head jacket (23) is less than the preceding cylinder casing water jacket (11), rear cylinder casing water jacket (21), preceding cylinder gas The thickness of cylinder body water jacket (12), rear cylinder block jacket (22), and preceding cylinder cylinder head jacket (13), the rear cylinder cylinder head jacket (23) thickness in engine spark plug and fuel injector near zone is less than preceding cylinder cylinder head jacket (13), the rear cylinder cylinder head water The thickness in other regions on set (23).

10. straight arrangement double-cylinder engine cooling water jacket structure according to claim 2, it is characterised in that：The preceding cylinder cylinder head Water jacket (13), rear cylinder cylinder head jacket (23) the top correspondence on the region of outlet water jacket (3) are disposed with small-bore Cylinder exhaust pipe (132), rear cylinder blast pipe (232).