CN103967645A - Piston retaining ring for free piston type engine - Google Patents

Abstract

The invention discloses a piston retaining ring for a free piston type engine. The piston retaining ring comprises a free piston type engine consisting of a hydraulic pump body assembly, a first air cylinder assembly and a second air cylinder assembly, wherein the first air cylinder assembly is connected to one side of the hydraulic pump body assembly; the second air cylinder assembly is connected to the other side of the hydraulic pump body assembly; an inner piston assembly and an outer piston assembly are respectively arranged on the first air cylinder assembly and the second air cylinder assembly; a first piston retaining ring is arranged on the inner piston assembly; a second piston retaining ring is arranged on the outer piston assembly. The piston retaining ring disclosed by the invention has the benefits that hydraulic oil around the piston is used as an energy storage medium for absorbing kinetic energy of piston motion, so that potential impact energy of the piston and parts of the other engine is reduced and further the damage to the parts of the engine is avoided; by adopting the free piston type engine, greater balance is realized, the operation of a homogeneous charge compression ignition engine is facilitated and the friction required to overcome during operation is smaller.

Description

A kind of piston stopper of free piston engine

Technical field

The present invention relates to free piston engine, relate to specifically a kind of piston stopper of free piston engine.

Background technique

In general, motor turns round by the fixing mechanical motion of piston.For example, a traditional motor car engine comprises a bent axle and several linkage component, and this has just determined that each piston moves in cylinder separately.We are desirable just for this class motor, because at given time, the position of each piston in work cycle determined, and simplified timing and the running of motor.Although the internal-combustion engine of traditional type was greatly improved aspect efficiency in recent years, due to the intrinsic propesties of motor, its efficiency remains limited.Particularly, because the mechanical motion of piston is fixed, just determined that compression ratio fixes, thereby caused its specific power limited.In addition, all movement parts comprise the motion of piston (bent axle and valve etc.) and have produced a large amount of frictional force, and the energy that these frictional force need motor self to produce goes to overcome.Consequent low specific power mean motor by than expectation more greatly, heavier.In addition, because must consider the mechanical connection of all parts, the design of motor and the limited flexibility system of general arrangement.

Therefore,, for environment and other reasons, need to there is a motor that has higher power than conventional engines.In automobile and the application of stationary power generation machine, relative lighter weight, less boundary dimension, higher fuel efficiency can produce larger advantage.

The motor of another type is free piston engine.The motion of the piston of this class motor in cylinder is unfixed.This motion depends on that any given time acts on the equilibrant on piston.Because the motion of piston is unfixed, the compression ratio of motor is variable, and this makes when designed engines Operational Limits, there is greater flexibility.In addition, owing to there is no traditional connecting rod, just reduced the lateral force of piston, the friction producing during engine running is also very little.Yet, because the motion of piston is unfixed, just there will be a problem, how to make piston stop at the end of its stroke.In general, by controlling fuel and energy storage system, can obtain the piston stroke of Len req.If but some unfavorable conditions generations, normally in combustion process, piston has obtained too many kinetic energy, cannot stop in time at its end of travel, and engine part is caused to damage.

Chinese patent CN202431388U discloses a kind of lightweight piston of motorcycle lower arranging cam axle type motor, is positioned at the cylinder block of cylinder head bottom, mainly comprises piston only, piston ring and wrist pin; Piston ring is nested with on piston only, bottom at piston only is connected with bent axle by wrist pin, retaining ring for piston pin, the power loss having caused because of self inertia when the utility model has reduced round acting, improved power, but unresolved to be solved by this invention while obtaining too much kinetic energy in combustion process piston fail to make to stop in time, the problem of infringement engine part, both described fields are also different, and the present invention is mainly used in free piston engine.

Chinese patent CN102011644A discloses a kind of internal-combustion engine, and this internal-combustion engine comprises that two with the opposed cylinder of 180 degree.In certain embodiments, two outer pistons of link connection one in front and one in back move it.One center piston moves between two outer pistons and with respect to outer piston.This link is suitable for driving earphone mechanical device according to the specific embodiment of live axle, generator, oil hydraulic pump, pneumatic pump and geared machine device, this patent belongs to free piston engine field, but does not also solve technical problem to be solved by this invention.

Summary of the invention

The problems referred to above that exist for existing free piston engine, the invention provides a kind of piston stopper that can effectively protect the motor of engine component.

The technological scheme that the present invention adopted is for achieving the above object:

A kind of piston stopper of free piston engine, comprise the free piston engine being formed by hydraulic pump body assembly, the first cylinder assembly, the second cylinder assembly, described the first cylinder assembly is connected in a side of described hydraulic pump body assembly, and described the second cylinder assembly connects the opposite side with described hydraulic pump body assembly; Described the first cylinder assembly comprises the first cylinder, described the first cylinder bearing of trend is parallel to axis of movement, described the second cylinder assembly comprises the second cylinder, described the second cylinder bearing of trend is parallel to axis of movement, in described the first cylinder and described the second cylinder, is respectively equipped with inner carrier assembly and outer piston assembly; Described inner carrier assembly comprises the inner carrier being fixed on through on the push rod of described hydraulic pump body assembly, the top of described inner carrier is towards the direction away from described hydraulic pump body assembly, described inner carrier assembly is provided with first piston back-up ring, described outer piston assembly comprises wrist pin, pull bar and outer piston, described outer piston is connected with described pull bar by described wrist pin, the top of described outer piston is towards described inner carrier, and described outer piston assembly is provided with the second piston stopper.

The piston stopper of above-mentioned free piston engine, wherein, described first piston back-up ring is positioned at the end of the push-rod hole on described hydraulic pump body assembly, described first piston back-up ring is provided with the first step part and second step part radially radially, described push rod be provided with described first radially step part match first radially step and with described second the second step radially that radially step part matches, the described push rod in described push-rod hole has been full of hydraulic oil around.

The piston stopper of above-mentioned free piston engine, wherein, a part for described pull bar is fixed on described outer piston, another part comprises a plunger of being located in tie rod hole, described plunger and described tie rod hole play the effect of sealing jointly, described the second piston stopper is located at the end of described tie rod hole, described the second piston stopper is provided with the 3rd step part and the 4th step part radially radially, described pull bar be provided with the described the 3rd radially step part match the 3rd radially step and with the described the 4th the 4th step radially that radially step part matches, described pull bar in described tie rod hole has been full of hydraulic oil around.

The piston stopper of above-mentioned free piston engine, wherein, described first piston back-up ring is provided with the first inclined-plane, described the first inclined-plane from described first radially step part extend to the described second step part radially, described push rod is provided with the second inclined-plane matching with described the first inclined-plane, described the second inclined-plane from described first radially step extend to the second step radially.

The piston stopper of above-mentioned free piston engine, wherein, described the second piston stopper is provided with the 3rd inclined-plane, described the 3rd inclined-plane from the described the 3rd radially step part extend to the described the 4th step part radially, described push rod is provided with the 4th inclined-plane matching with described the 3rd inclined-plane, described the 4th inclined-plane from the described the 3rd radially step extend to the 4th step radially.

Owing to having adopted above-mentioned technology, the good effect that technique scheme compared with prior art has is:

Piston hydraulic oil around absorbs the kinetic energy of piston movement as energy storage medium, reduced the potential Impact energy of piston and another engine component and avoid the infringement of engine component; The structure of piston stopper is relatively simple and cheap, thereby avoids engine component because damaging the high maintenance expenses of bringing; Adopt free piston engine, opposed housing structure is more easily transformed into free piston engine and makes its balance more, also be of value to homogeneity compression-ignition engine running, compare with crank engine, free piston engine has movement parts still less, needs the friction that overcomes less between on-stream period.

Accompanying drawing explanation

Fig. 1 be a kind of free piston engine of the present invention piston stopper be applied in the schematic diagram in the opposed cylinder type free piston engine of opposed pistons;

Fig. 2 is the end view of the free piston engine of the piston stopper of a kind of free piston engine of the present invention in Fig. 1;

Fig. 3 is the plan view of the second cylinder assembly of the free piston engine of the piston stopper of a kind of free piston engine of the present invention in Fig. 1;

Fig. 4 is the plan view of the first cylinder assembly of the free piston engine of the piston stopper of a kind of free piston engine of the present invention in Fig. 1;

Fig. 5 is the side view of the second cylinder assembly of the free piston engine of the piston stopper of a kind of free piston engine of the present invention in Fig. 1;

Fig. 6 is the side view of the first cylinder assembly of the free piston engine of the piston stopper of a kind of free piston engine of the present invention in Fig. 1;

Fig. 7 is the sectional view of 5A-5A part in Fig. 3;

Fig. 8 is the sectional view of 5B-5B part in Fig. 4;

Fig. 9 is the sectional view of 6A-6A part in Fig. 5;

Figure 10 is the sectional view of 6B-6B part in Fig. 6;

Figure 11 is the hydraulic pump body assembly of free piston engine and the schematical top view of inner carrier assembly of the piston stopper of a kind of free piston engine of the present invention in Fig. 1;

Figure 12 is the hydraulic pump body assembly of free piston engine and the bottom schematic view of inner carrier assembly of the piston stopper of a kind of free piston engine of the present invention in Fig. 1;

Figure 13 is the cylinder liner schematic diagram of the free piston engine of the piston stopper of a kind of free piston engine of the present invention in Fig. 1;

Figure 14 is the hydraulic circuit schematic diagram of the free piston engine of the piston stopper of a kind of free piston engine of the present invention in Fig. 1;

Figure 15 is the circuit diagram of the free piston engine of the piston stopper of a kind of free piston engine of the present invention in Fig. 1;

Figure 16 is the local amplification view of the piston stopper of the free piston engine of the piston stopper of a kind of free piston engine of the present invention in Fig. 1.

Embodiment

Below in conjunction with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.

The piston stopper of a kind of free piston engine of the present invention as shown in Fig. 1-12, comprise by hydraulic pump body assembly 12, the first cylinder assembly 14, the free piston engine 10 that the second cylinder assembly 16 forms, free piston engine 10 is not only stored the energy of the pressure fluid form of motor generation, and can start with partial pressure fluid, sometimes can help the running of control engine and maintain the balance of motor, the first cylinder assembly 14 is connected in a side of hydraulic pump body assembly 12, the second cylinder assembly 16 is connected in the opposite side of hydraulic pump body assembly 12, the first cylinder assembly 14 comprises the first cylinder, the first cylinder bearing of trend is parallel to axis of movement, the second cylinder assembly 16 comprises the second cylinder, the second cylinder bearing of trend is parallel to axis of movement, is respectively equipped with inner carrier assembly 200 and outer piston assembly 250 in the first cylinder and the second cylinder, inner carrier assembly 200 comprises the inner carrier being fixed on through on the push rod 240 of hydraulic pump body assembly 12, the top of inner carrier is away from hydraulic pump body assembly 12, inner carrier assembly 200 is provided with first piston back-up ring 387, outer piston assembly 250 comprises wrist pin, pull bar and outer piston, outer piston is connected with pull bar by wrist pin, the top of outer piston is respectively towards inner carrier, and outer piston assembly 250 is provided with the second piston stopper.

Further, the first cylinder assembly 14 has comprised first water jacket 18, is arranged on described hydraulic pump body assembly 12.The first water jacket 18 has one above near the first waste gas spiral outlet 20 of hydraulic pump body assembly 12.The first waste gas spiral outlet 20 inside have one around the internal exhaust passages 22 of the first water jacket 18, and internal exhaust passages 22 extends radially outward the first exhaust flange 24.Exhaust flange 24 is connected with vent systems (not shown), during engine running, can export waste gas.Vent systems can be the type of any hope, as long as it can process and take away waste gas fully.For example, it can comprise a gas exhaust manifold, a baffler, a catalyst, a pressurized machine, or the combination of these parts and other possibility assemblies.

Further, the first water jacket 18 has one above near the cooling liquid entrance 26 of hydraulic pump body assembly 12, and extends to the cooling channel 28 that an annular is extended.Cooling liquid entrance 26 is connected in a cooling liquid cooling system (not shown), this cooling system can comprise a for example heat exchanger, from engine coolant, shift the radiator of heat, one by the water pump of cooling system pumping cooling liquid, one makes temperature transducer and the flow control valve in temperature range that cooling liquid maintains a hope, cooling line between component extends, or the combination of these parts and other possibility assemblies.This cooling system can be the engine-cooling system of any type of wanting, as long as can take away suitable heat from motor.

Further, from the first waste gas spiral outlet 20 1 sides, the other end of the first water jacket 18 is the air inlet rings 30 that annular is extended, and its inside is intake duct 31.Near in air inlet ring 30, the first water jacket 18, have an oil sprayer boss 32, the inside is provided with the first oil sprayer 34.The first oil sprayer 34 is connected with a controller 35, by controller 35, provides a signal to decide oil spout constantly and injection duration.The first oil sprayer 34 is also connected with oily rail 37, and oily rail 37 only shows schematic diagram to the first oil sprayer 34 supplies from oil-fired system 39() next fuel oil.Oil-fired system 39 can comprise, fuel tank for example, and fuel pump, leads to the fuel pipe of oily rail 37, or the combination that these and other may assemblies.The oil-fired system 39 of any type, as long as can provide enough fuel oils to accept to the first oil sprayer 34 under predetermined pressure.Oil rail 37 preferably has a fuel pressure transmitter, and is connected with controller 35.Controller 35 is preferably powered by the electrical system containing battery (not shown), the energy drives that generator or alternator are preferably exported by motor, or other reliable power supplys are supplied with.When controller 35 is when being single, as required, it can comprise the electronic processors of a plurality of communications each other.

Further, between the first waste gas spiral outlet 20 and air inlet ring 30, have a pressure sensor installation boss 36 in the first water jacket 18, the inside is provided with the first cylinder pressure sensor 38.The first cylinder pressure sensor 38 is connected with controller 35.Oil sprayer boss 32 and pressure sensor installation boss 36 extend to main aperture 40 through the first water jacket 18, increase like this length of the first water jacket 18.Cooling passage 28, internal exhaust passages 22 and air inlet ring 30 all communicate with main aperture 40.

Further, the first cylinder assembly 14 has also comprised the first cylinder sleeve 42, and it is press-fited and pass the main aperture 40 of the first water jacket 18.The first cylinder sleeve 42 has a columniform main aperture to be defined as the first cylinder cylinder hole 44.The central axis in the first cylinder cylinder hole 44 is along the direction of axial-movement.The first cylinder sleeve 42 also comprises a series of relief openings 46 that circularize arrangement, and they and are communicated with both between the first cylinder cylinder hole 44 and the internal exhaust passages 22 of the first water jacket 18.

Further, near relief opening 46, the first water jacket 18, there is one above near the cooling channel 28 of the first cylinder sleeve 42.This cooling channel 28 be a series ofly spaced apart, spiral muscle 48 is connected, muscle 48 extends radially outward from the outer surface of the first cylinder sleeve 42, and near the main aperture 40 of the first water jacket 18, has formed a series of cylinder bodies cooling channel 50.In these muscle 48 the insides, there is a cylinder body pressure tap 52 that extends to installation of sensors boss 36 above the first water jacket 18 from the first cylinder cylinder hole 44.The first cylinder pressure sensor 38 can be entered in the first cylinder cylinder hole 44, but the first cylinder pressure sensor 38 need sealing, prevents that engine coolant from entering.Oil injector hole 54 and 32 alignment of oil sprayer boss, enter the first cylinder cylinder hole 44 through muscle 48.The first oil sprayer 34 can direct injected fuel be entered in the first cylinder cylinder hole 44.

Further, the suction port 56 that the first cylinder sleeve 42 also has a series of edges to be circumferentially spaced, aligns with the air inlet ring 30 in the first water jacket 18, and leads to the first cylinder cylinder hole 44.Near suction port 56, the oil mist holes 58 that has a series of annulars to be spaced around the first cylinder sleeve 42.

Further, the first cylinder assembly 14 also comprises first air cavity 60.The first air cavity 60 is arranged on the first cylinder sleeve 42, near the air inlet ring 30 in the first water jacket 18.An oil inlet pipe 62 communicates with annular mist of oil chamber 64 through the first air cavity 60.Annular mist of oil chamber 64 is around the oil mist holes 58 on the first cylinder sleeve 42.Oil inlet pipe 62 communicates with a mist of oil producer (not shown), and mist of oil producer communicates with machine oil source, to annular mist of oil chamber 64, provides gas mixture.Machine oil source can be a part for oil supply system (not shown).Oil supply system can comprise oil pump for example, oil filter, machine oil cooler, oil sump, for transmitting the combination that the pipeline road of machine oil or these parts and other may assemblies.When engine running, oil supply system can fully filter machine oil together with other component, and to the enough lubricant oil of motor supply.

Further, near and around the air ring 66 that also has of the first cylinder sleeve 42.Air ring 66 communicates with cylinder body cooling channel 50, and communicates with the coolant outlet 68 through the first air cavity 60.Coolant outlet 68 communicates with cooling system (not shown) above-mentioned.In the first air cavity 60, have a pair of pull bar passage 70 and a gas-entered passageway 72, they communicate with the air inlet ring 30 in the first water jacket 18.

Further, the first cylinder assembly 14 is also integrated the first scavenging pump 74.The first scavenging pump 74 has a scavenging pump housing 76 being arranged on the first air cavity 60, is positioned at the end of the first cylinder sleeve 42.Scavenging pump housing 76 has a main pump chamber 78, by the suction port 80 above it, communicates with suction chamber 82, by air outlet 84, communicates with discharge chamber 86.Main pump chamber 78 is columniform, has the cross section of substantially elliptical.

Further, an air inlet reed valve ASSY 88 and a scavenging pump Intake Cover 90 are arranged on suction chamber 82.On Intake Cover 90, there is a suction port 92 communicating with gas handling system (not shown).Gas handling system can comprise intake manifold, air control shutter, air flow sensor, air temperature sensor, the air-strainer for example communicating with turbosupercharger or mechanical supercharger, or the combination of these parts and other possibility assemblies.Gas handling system can be the system of any type, as long as under certain operating mode, can supply the air of requirement to suction port 92 under required pressure.

Further, the leaf valve 94 on air inlet reed valve ASSY 88 can make the air-flow in Intake Cover 90 enter suction chamber 82, but stops air-flow to flowing in the other direction.Give vent to anger reed valve ASSY 89 and a scavenging pump are given vent to anger and are covered 91 and be arranged on discharge chamber 86.Giving vent to anger to cover in 91 has a gas-entered passageway 93, and the air that the reed valve ASSY 89 that makes to give vent to anger is discharged enters in air inlet ring 31 by the gas-entered passageway 72 in the first air cavity 60.The leaf valve 95 of giving vent to anger in reed valve ASSY 89 can make the air-flow in discharge chamber 86 enter in gas-entered passageway 93, but stops air-flow to flowing in the other direction.

Further, the second cylinder assembly 16 has second water jacket 118 being arranged on hydraulic pump body assembly 12.The second water jacket 118 has one near the second waste gas spiral outlet 120 of hydraulic pump body assembly 12.The second waste gas spiral outlet 120 inside are the internal exhaust passages 122 around the second water jacket 118, and internal exhaust passages 122 extends radially outward the second exhaust flange 124.The second exhaust flange 124 communicates with described vent systems (not shown).In the second water jacket 118, have one near the cooling liquid entrance 126 of hydraulic pump body assembly 12, cooling liquid entrance 126 communicates with the cooling channel 128 that annular is extended.Cooling liquid entrance 126 (not shown) that communicates with cooling system.

Further, from the second waste gas spiral outlet 120 1 sides, the other end of the second water jacket 118 is the air inlet rings 130 that annular is extended, and its inside is intake duct 131.Near in air inlet ring 130, the second water jacket 118, have an oil sprayer boss 132, the inside is provided with the second oil sprayer 134.The second oil sprayer 134 is connected with controller 35, by controller 35, provides a signal to decide oil spout constantly and injection duration.The second oil sprayer 134 is also connected with oily rail 37, the fuel oil of oily rail 37 to the second oil sprayer 134 supplies from oil-fired system 39.Oil-fired system 39 can comprise, fuel tank for example, and fuel pump, leads to the fuel pipe of oily rail 37.Oil rail 37 preferably has one to be connected fuel pressure transmitter 141 with controller 35.

Further, between the second waste gas spiral outlet 120 and air inlet ring 130, have a pressure sensor installation boss 136 in the second water jacket 118, the inside is provided with the second cylinder pressure sensor 138.Oil sprayer boss 132 and pressure sensor installation boss 136 extend to main aperture 140 through the second water jacket 118, have increased like this length of the second water jacket 118.Cooling channel 128, internal exhaust passages 122 and air inlet ring 130 all communicate with main aperture 140.

Further, the second cylinder assembly 16 has also comprised the second cylinder sleeve 142, and it is press-fited and pass the main aperture 140 of the second water jacket 118.The second cylinder sleeve 142 has a columniform main aperture to be defined as the second cylinder cylinder hole 144.The central axis in the second cylinder cylinder hole 144 is along the direction of axial-movement.The second cylinder sleeve 142 also comprises a series of relief openings 146 that circularize arrangement, and they and are communicated with both between the second cylinder cylinder hole 144 and the internal exhaust passages 122 of the second water jacket 118.

Further, near relief opening 146, the second water jacket 118, there is one above near the cooling channel 128 of the second cylinder sleeve 142.This cooling channel 128 be a series ofly spaced apart, spiral muscle 148 is connected, muscle 148 extends radially outward from the outer surface of the second cylinder sleeve 142, and near the main aperture 140 of the second water jacket 118, has formed a series of cylinder bodies cooling channel 150.In these muscle 148 the insides, there is a cylinder body pressure tap 152 that extends to installation of sensors boss 136 above the second water jacket 118 from the second cylinder cylinder hole 144.The second cylinder pressure sensor 138 can be entered in the second cylinder cylinder hole 144, but the second cylinder pressure sensor 138 need sealing, prevents that engine coolant from entering.Oil injector hole and 132 alignment of oil sprayer boss, enter the second cylinder cylinder hole 144 through muscle 148.The second oil sprayer 134 can direct injected fuel be entered in the second cylinder cylinder hole 144.

Further, the suction port 156 that the second cylinder sleeve 142 also has a series of edges to be circumferentially spaced, aligns with the air inlet ring 130 in the second water jacket 118, and leads to the second cylinder cylinder hole 144.Near suction port 156, the oil mist holes 158 that has a series of annulars to be spaced around the second cylinder sleeve 142.

Further, the second cylinder assembly 16 also comprises second air cavity 160.The second air cavity 160 is arranged on the second cylinder sleeve 142, near the air inlet ring 130 in the second water jacket 118.An oil inlet pipe 162 communicates with annular mist of oil chamber 164 through the second air cavity 160.Annular mist of oil chamber 164 is around the oil mist holes 158 on the second cylinder sleeve 142.Oil inlet pipe 162 communicates with a mist of oil producer (not shown), to annular mist of oil chamber 164, provides gas mixture.

Further, near and around the air ring 166 that also has of the second cylinder sleeve 142.Air ring 166 communicates with cylinder body cooling channel 150, and communicates with the coolant outlet 168 through the second air cavity 160.Coolant outlet 168 communicates with cooling system (not shown) above-mentioned.In the second air cavity 160, have a pair of pull bar passage 170 and a gas-entered passageway 172, they communicate with the air inlet ring 130 in the second water jacket 118.

Further, the second cylinder assembly 16 is also integrated the second scavenging pump 174.The second scavenging pump 174 has a scavenging pump housing 176 being arranged on the second air cavity 160, is positioned at the end of the second cylinder sleeve 142.Scavenging pump housing 176 has a main pump chamber 178, by the suction port 180 above it, communicates with suction chamber 182, by air outlet 184, communicates with discharge chamber 186.Main pump chamber 178 is columniform, has the cross section of substantially elliptical.An air inlet reed valve ASSY 188 and a scavenging pump Intake Cover 190 are arranged on suction chamber 182.On Intake Cover 190, there is a suction port 192 communicating with intake manifold (not shown).Intake manifold receives the air of coming from turbosupercharger or mechanical supercharger.Leaf valve 194 on air inlet reed valve ASSY 188 can make the air-flow in Intake Cover 190 enter suction chamber 182, but stops air-flow to flowing in the other direction.

Further, give vent to anger reed valve ASSY 189 and a scavenging pump are given vent to anger and are covered 191 and be arranged on discharge chamber 186.Giving vent to anger to cover in 191 has a gas-entered passageway 193, and the air that the reed valve ASSY 189 that makes to give vent to anger is discharged enters in air inlet ring 131 by the gas-entered passageway 172 in the second air cavity 160.The leaf valve 195 of giving vent to anger in reed valve ASSY 189 can make the air-flow in discharge chamber 186 enter in gas-entered passageway 193, but stops air-flow to flowing in the other direction.

Further, two cylinder assembly inside, there are two piston assemblys, i.e. inner carrier assembly 200 and outer piston assembly 250.Inner carrier assembly 200 has a piston top 210 that is arranged on the first inner carrier 202, the first inner carriers 202 in the first cylinder cylinder hole 44 towards the direction away from hydraulic pump body assembly 12, and rear end 211 is towards the direction near hydraulic pump body assembly 12.Between the outer surface of the first inner carrier 202 and the first cylinder cylinder hole 44, there is a very little gap.Thus, the outer surface You San road piston ring groove of the first inner carrier 202, first annular groove the inside is provided with compression ring 204, and second annular groove the inside is provided with compression ring 206, and annular groove the inside in San road is provided with oil ring 208.All San road ring is designed to certain size, makes its outer surface be adjacent to the first cylinder cylinder hole 44 inwalls, plays the effect of sealing.

Further, the first inner carrier 202 also has a series of holes 212 of extending vertically, and extend to piston top 210 from the rear end 211 of the first inner carrier 202 in these holes.In each hole 212, a certain amount of sodium compound is housed, there is plug 214 end in hole 212, for sealing sodium compound.

Further, inner carrier assembly 200 has a piston top 222 that is arranged on the second inner carrier 220, the second inner carriers 220 in the second cylinder cylinder hole 144 towards the direction away from hydraulic pump body assembly 12, and rear end 223 is towards the direction near hydraulic pump body assembly 12.Between the outer surface of the second inner carrier 220 and the second cylinder cylinder hole 144, there is a very little gap.Thus, the outer surface You San road piston ring groove of the second inner carrier 220, first annular groove the inside is provided with compression ring 224, and second annular groove the inside is provided with compression ring 226, and annular groove the inside in San road is provided with oil ring 228.All San road ring is designed to certain size, makes its outer surface be adjacent to the second cylinder cylinder hole 144 inwalls, plays the effect of sealing.

Further, the second inner carrier 220 also has a series of holes 230 of extending vertically, and extend to piston top 222 from the rear end 223 of the second inner carrier 220 in these holes.In each hole 230, a certain amount of sodium compound is housed, there is plug 232 end in hole 230, for sealing sodium compound.

Further, the middle position of the first inner carrier 202 has an axially extended hole 216, and the inside has the middle position of clamping bolt 218, the second inner carriers 220 to have an axially extended hole 234, and there is clamping bolt 226 the inside.Bolt 218 and 236 is threaded connection on the two ends of push rod 240, and push rod 240 is through hydraulic pump body assembly 12.Push rod 240 two ends are separately fixed on the first inner carrier 202 and the second inner carrier 220, and the first inner carrier 202 and the second inner carrier 220 are synchronized with the movement along axial direction.The region that has place's diameter to increase on push rod 240, has formed an inner plunger 242.Inner plunger 242 is positioned at the neutral position of the first inner carrier 202 and the second inner carrier 220.

Further, inner carrier assembly 200 also contains the first guide rod 244 and 245, two guide rods of the second guide rod all pass hydraulic pump body assembly 12, and the rear end 211 and 223 of the first inner carrier 202 and the second inner carrier 220 is linked together.During engine running, the first guide rod 244 and the second guide rod 245 play the effect that prevents 200 rotations of inner carrier assembly.The first guide rod 244 and the second guide rod 245 have at least one position transducer above, when engine running, can determine the axial position of inner carrier assembly 200.The mode of sensor sensing can adopt the form of on the first guide rod 244, first group of copper ring 246 being installed.The second guide rod 245 has second group of copper ring 247 above.Position transducer on the first guide rod 244 is when reading out data, and the second guide rod 245 can be used as a part for position correction sensor, to guarantee to read accurately the axial position of inner carrier assembly 200.

Further, have the piston top 254 of first outer piston 252, the first outer pistons 252 that are positioned at the first cylinder cylinder hole 44 towards the piston top 210 of the first inner carrier 202 on outer piston assembly 250, rear end 256 is towards the main pump chamber 78 of the first scavenging pump.Between the outer surface of the first outer piston 252 and the first cylinder cylinder hole 44, there is a very little gap.Thus, the outer surface You San road piston ring groove of the first outer piston 252, first annular groove the inside is provided with compression ring 258, and second annular groove the inside is provided with compression ring 260, and annular groove the inside in San road is provided with oil ring 262.All San road ring is designed to certain size, makes its outer surface be adjacent to the first cylinder cylinder hole 44 inwalls, plays the effect of sealing.

Further, first piston pin 264 is arranged on the rear end 256 of the first outer piston 252.First piston pin 264 moves together with the first outer piston 252, becomes a part for the first outer piston 252.On first piston pin 264, there is an oval part 266, the main pump chamber 78 inwall sliding contacts of it and the first scavenging pump 74 sealing.The path of oval part 266 is less than the piston top of the first outer piston 252 254 diameters a little, but the large footpath of oval part 266 is obviously large than the piston top of the first outer piston 252 254 diameters.The large footpath direction along oval part 266 of the first rod head 268 and the second rod head 269, is positioned at the radially outer position of the first outer piston 252 outsides.

Further, guide rod boss 270 is positioned at the central position of first piston pin 264, on the axis of this central position in the first outer piston 252 motions.The 3rd guide rod 271 is fixed on the first scavenging pump housing 76, and extends out therefrom.The outer surface of the 3rd guide rod 271 is cylindrical, its central position in cylinder hole, and axis is parallel with axis of movement.The outer surface of the 3rd guide rod 271 is enclosed within guide rod boss 270 inside, and guide rod boss 270 can be slided along the 3rd guide rod 271.Because the 3rd guide rod 271 is fixed, so it can accurately be located with respect to the position in the first cylinder cylinder hole 44.Therefore, the 3rd guide rod 271 can make the position of first piston pin 264, the first outer piston 252 can locate accurately with respect to the position in the first cylinder cylinder hole 44.

Further, during engine running, guide rod boss 270 slides on the 3rd guide rod 271, makes the first outer piston 252 keep correct direction during the first cylinder cylinder hole 44 interior to-and-fro motion, makes to only have compression ring 258, compression ring 260 and oil ring 262 to contact with the first cylinder cylinder hole 44.In the time of due to motion, only have compression ring 258, compression ring 260 and oil ring 262 and guide rod boss 270 and other part surface sliding contacts, and the first outer piston 252 outer surfaces do not contact with the first cylinder cylinder hole 44, so the frictional force producing is very little.

Further, have the piston top 276 of second outer piston 275, the second outer pistons 275 that are positioned at the second cylinder cylinder hole 144 towards the piston top 222 of the second inner carrier 220 on outer piston assembly 250, rear end 277 is towards the main pump chamber 178 of the second scavenging pump.Between the outer surface of the second outer piston 275 and the second cylinder cylinder hole 144, there is a very little gap.Thus, the outer surface You San road piston ring groove of the second outer piston 275, first annular groove the inside is provided with compression ring 278, and second annular groove the inside is provided with compression ring 279, and annular groove the inside in San road is provided with oil ring 280.All San road ring is designed to certain size, makes its outer surface be adjacent to the second cylinder cylinder hole 144 inwalls, plays the effect of sealing.

Further, the second wrist pin 282 is arranged on the rear end 277 of the second outer piston 275.On the second wrist pin 282, having an outside is oval part 283, the main pump chamber 178 inwall sliding contacts of it and the second scavenging pump 174 sealing.The path of oval part 283 is less than the diameter of the piston top of the second outer piston 275 276 a little, but the large footpath of oval part 283 is obviously large than the diameter of the piston top of the second outer piston 275 276.The 3rd rod head 284 and four-pull-rod head 285, along the large footpath direction of oval part 283, are positioned at the radially outer position of the first outer piston 275 outsides.

Further, guide rod boss 286 is positioned at the central position of the second wrist pin 282, and the 4th guide rod 287 is fixed on the second scavenging pump housing 176, and extends out therefrom.The outer surface of the 4th guide rod 287 is cylindrical, its central position in cylinder hole, and axis is parallel with axis of movement.Guide rod boss 286 can slide along the 4th guide rod 287.Because the 4th guide rod 287 is fixed with respect to the second cylinder cylinder hole 144, therefore, the 4th guide rod 287 can make the position of the second wrist pin 282, the second outer piston 275 can locate accurately with respect to the position in the second cylinder cylinder hole 144.During engine running, guide rod boss 286 slides on the 4th guide rod 287, makes the second outer piston 275 keep correct direction during the second cylinder cylinder hole 144 interior to-and-fro motion, makes only there is compression ring 278, compression ring 279 contacts with the second cylinder cylinder hole 144 with oil ring 280.So just make minimum friction forces, piston is had to suitable leading role simultaneously.

Further, on the 4th guide rod 287, also formed a part for position transducer assembly 288, position transducer assembly 288 comprises a rodmeter 289, and rodmeter 289 has a location index 290 at least above, is fixed on the second outer piston 275 and moves thereupon.Sensor 291 is arranged near rodmeter 289, and through the second scavenging pump housing 176, by electronic connector 292, sensor 291 is connected with controller 35.Controller 35 can utilize the signal of sensor 291 outputs to judge position and the speed of outer piston assembly 250.

Further, outer piston assembly 250 also contains the first pull bar 293 and the second pull bar 294.The first rod head 268 on the first pull bar 293 connection first piston pins 264 and the 3rd rod head 284 on the second wrist pin 282.Because first piston pin 264 and the second wrist pin 282 are oval-shaped, the first pull bar 293 can make their motions of paralleling to the axis that combines, and does not affect the work of cylinder.

Further, the first pull bar 293 has the region that one end diameter is larger, has formed the first outer plunger 295.The first outer plunger 295 is positioned on hydraulic pump body assembly 12, the neutral position in first piston pin 264 and the second wrist pin 282.The first pull bar sleeve 272 is enclosed within the first pull bar 293 outsides, and between hydraulic pump body assembly 12 and the first water jacket 18, the second pull bar sleeve 274 is enclosed within on the first pull bar 293, between hydraulic pump body assembly 12 and the second water jacket 118.The first pull bar sleeve 272 and the second pull bar sleeve 274 guarantee that the first pull bar 293 is enclosed in engine components the inside completely, stop pollutant contact and interfere the running of the first pull bar 293.

Further, the second rod head 269 on the second pull bar 294 connection first piston pins 264 and the four-pull-rod head 285 on the second wrist pin 282.The second pull bar 294 has one section of region that diameter is larger, has formed the second outer plunger 296.The second outer plunger 296 is positioned on hydraulic pump body assembly 12, the neutral position in first piston pin 264 and the second wrist pin 282.The 3rd pull bar sleeve 273 is enclosed within the second pull bar 294 outsides, between hydraulic pump body assembly 12 and the first water jacket 18, a four-pull-rod sleeve 281 with position transducer is enclosed within on the second pull bar 294, between hydraulic pump body assembly 12 and the second water jacket 118.The 3rd pull bar sleeve 273 and four-pull-rod sleeve 281 guarantee that the second pull bar 294 is enclosed in engine components the inside completely, stop pollutant contact and interfere the running of the second pull bar 294.

Further, the second pull bar 294 is also arranged on copper ring 298 above it, spaced apart, and is positioned at four-pull-rod sleeve 281 the insides for position sensing above.Four-pull-rod sleeve 281 the insides comprise one near the sensor unit 297 of copper ring 298.Sensor unit 297 is connected with controller 35, for surveying the position of copper ring 298.Controller 35 utilizes the signal of sensor unit 297 outputs to proofread and correct another sensor 291, therefore can guarantee accurately to survey position and the speed of outer piston assembly 250.

Further, in order to ensure best service performance, motor need to keep balance.In order to make motor keep balance, the gross mass of outer piston assembly 250, the gross mass of all parts that move together with the second outer piston 275 with the first outer piston 252, the gross mass that must be equal to inner carrier assembly 200, the gross mass of all parts that move together with the second inner carrier 220 with the first inner carrier 202.In addition, for balanced engine, the hydraulic pressure area of the inner plunger 242 of push rod 240 is with the first outer plunger 295 of the first pull bar 293 and the second pull bar 294 and total hydraulic pressure area of the second outer plunger 296 equates and the hydraulic pressure area of the first outer plunger 295 also will equate with the hydraulic pressure area of the second outer plunger 296.Thereby on inner carrier assembly 200 and outer piston assembly 250, different parts can select suitable material to guarantee heat resistance and strength characteristics, guarantee the mass balance of assembly simultaneously.For example, the first inner carrier 202, the second inner carrier 220 and push rod 240 can cylinder iron be manufactured, the first pull bar 293 and the second pull bar 294 also can cylinder iron be manufactured, the first outer piston 252 and the second outer piston 275 can be used aluminum alloy manufacture, and the first piston pin 264 of elliptical shape and the second wrist pin 282 can be used steel making.If needed, other suitable material also can be applied.

Further, hydraulic pump body assembly 12 is between the first cylinder assembly 14 and the second cylinder assembly 16, and it comprises one with the pump housing 302 of steel, has formed a lot of hydraulic port and passage as cooling passage, lubricating oil sump and passage etc. above the pump housing 302.

Further, the push-rod hole 304 that has a push rod 240 to pass on the pump housing 302.The Sealing annular of inner plunger 242 is around push-rod hole 304.The two ends of push-rod hole 304 also seal push rod 240 and one end adopts seal plug 309 to seal.These Sealings make a side of inner plunger 242 form Liao Yigenei pumping chamber 306, and opposite side has formed the pumping chamber 308 that is coupled in.

Further, on the pump housing 302, also have first tie rod hole 310 that the first pull bar 293 passes, and the second tie rod hole 312 of passing of the second pull bar 294.The Sealing of the first outer plunger 295 circumferentially around the Sealing of the first tie rod hole 310, the second outer plunger 296 circumferentially around the second tie rod hole 312.Each end of the first tie rod hole 310 is all designed to be convenient to the shape of sealing, and one end of the first pull bar 293 utilizes seal plug 311 to seal.The first tie rod hole 310 side in the first outer plunger 295 together with the first pull bar 293 has formed the first outer pump chamber 314, at opposite side, has formed the first outer coupling pump chamber 316.Each end of the second tie rod hole 312 is all designed to be convenient to the shape of sealing, and one end of the second pull bar 294 utilizes seal plug 313 to seal.The second tie rod hole 312 side in the second outer plunger 296 together with the second pull bar 294 has formed the second outer pump chamber 318, at opposite side, has formed the second outer coupling pump chamber 320.

Further, the outer coupling pump chamber 316 of interior coupling pumping chamber 308 and first is communicated with by the first interconnection passage 322.In addition, the outer coupling pump chamber 320 of interior coupling pumping chamber 308 and second is communicated with by the second interconnection passage 323, therefore the interior coupling outer coupling pump chamber 316 of pumping chamber 308, first and the state of the second outer coupling pump chamber 320 in being interconnected.

Further, low-pressure channel 324 and a flow controller 326, make the second interconnection passage 323 be communicated with the first coupling modulating valve 328.The first coupling modulating valve 328 is communicated with the low-pressure oil storage pond 330 of hydraulic system 329 1 sides.The first coupling modulating valve 328 can switching position, makes fluid enter low-pressure oil storage pond 330 from the second interconnection passage 323, can also switch a position, stops fluid to pass through.High-pressure channel 332 and a flow controller 334, make the first interconnection passage 322 be communicated with the second coupling modulating valve 336.The second coupling modulating valve 336 is communicated with the high pressure oil storage pool 338 of hydraulic system 329 1 sides.The second coupling modulating valve 336 can switching position, makes fluid enter the first interconnection passage 322 from high pressure oil storage pool 338, can also switch a position, stops fluid to pass through.The first coupling modulating valve 328 is connected with controller 35 with the second coupling modulating valve 336, and by its control.

Further, the resonator passage 340 on the pump housing 302 has connected the second interconnection passage 323 and Helmholtz resonator 342.Helmholtz resonator 342 sets, and is used for producing and pulsing when damper fluid flows in interior coupling pumping chamber's the 308, first outer coupling pump chamber 316 and the second outer coupling pump chamber 320 back and forth by the first interconnection passage 322 and the second interconnection passage 323.If needed, Helmholtz resonator 342 can remove from motor.

Further, the first interconnection passage 322 and the second interconnection passage 323, and the hydraulic element that are connected with them, formed an oil hydraulic circuit, and hydraulic pressure makes the motion of inner carrier assembly 200 synchronize with outer piston assembly 250.Because, when the first coupling modulating valve 328 and the second coupling modulating valve 336 are when close, the inside of the interior coupling outer coupling pump chamber 316 of pumping chamber 308, first and the second outer coupling pump chamber 320 and the first interconnection passage 322 and the second interconnection passage 323 has been full of compressed fluid (for example hydraulic oil), and this volume remains unchanged.Every traveling priority certain distance, the fluid volume variable quantity in the inner plunger 242 of push rod 240 is in the first outer plunger 295 of the first pull bar 293 and the second pull bar 294 and the second outer plunger 296 2 times of fluid volume variable quantity separately.Therefore, the 1mm if inner carrier assembly 200 moves right, the fluid flowing out from interior coupling pumping chamber 308 the insides makes outer piston assembly 250 be moved to the left 1mm, so that the first outer coupling pump chamber 316 and the second outer coupling pump chamber 320 receive these fluids.This can guarantee, even without mechanically fixedly inner carrier assembly 200 and the motion of outer piston assembly 250, they also can carry out relative movement accurately.Therefore, inner carrier assembly 200 and outer piston assembly 250 can arrive top dead center and lower dead center simultaneously.

Further, if Sealing is revealed the stereomutation that makes Coupler inner fluid, as required, the first coupling modulating valve 328 and the second coupling modulating valve 336 can increase or reduce the fluid volume of Coupler the inside.Although above-described, be make inner carrier assembly 200 and the hydraulic system of outer piston assembly 250 interlock, if other mechanical devices can guarantee inner carrier assembly 200 and 250 relative movement of outer piston assembly, also can apply.

Further, on hydraulic pump body assembly 12, there are a pair of pump housing 302 bottoms that are positioned at, the oil inlet pipe 344 and 345 communicating with oil sump 346 through the pump housing 302.On hydraulic pump body assembly 12, a lot of movement parts are all on oil sump 346 tops so that can splash lubrication movement parts, particularly the first inner carrier 202, the second inner carrier 220 part of sliding along the first cylinder cylinder hole 44 and the second cylinder cylinder hole 144.On oil sump 346, also has an oil return outlet 348.Oil inlet pipe 344 and 345 and oil return outlet 348 all communicate with oil supply system (not shown).When the first inner carrier 202 and the second inner carrier 220 to-and-fro motion, oil sump 346 also can make the movement that the air of piston rear end can be back and forth.

Further, cooling liquid entrance 350 is positioned at the bottom of the pump housing 302, communicates, then communicate with two cooling liquid outlets 354 that are arranged on the pump housing 302 tops with a series of pump housing 302 cooling channels 352 everywhere that are distributed in.Cooling liquid entrance 350 and cooling liquid outlet 354 communicate with cooling system (not shown).Cooling liquid is in the pump housing 302 internal flows, not overheated with movement parts during guaranteeing engine running.

Further, hydraulic pump body assembly 12 also comprises a low pressure oil rail 356 that is arranged on the pump housing 302 tops, and the low pressure oil rail port 358 on low pressure oil rail 356 communicates with low-pressure oil storage pond 330 by hydraulic pipe line.Low pressure oil rail 356 and three groups of low pressure check valve, the outside one-way valve 363 of the outside one-way valve 362, second of internal one-way valve 360, first communicates.Internal one-way valve 360 communicates with internal pump chamber 306 by a passage 364, and 360 of internal one-way valves allow fluid to flow to internal pump chamber 306 from low pressure oil rail 356.The first outside one-way valve 362 communicates with the first outside pump chamber 314 by passage 365, and the first 362, outside one-way valve allows fluid to flow to the first outside pump chamber 314 from low pressure oil rail 356.The second outside one-way valve 363 communicates with the second outside pump chamber 318 by passage 366, and the second 363, outside one-way valve allows fluid to flow to the second outside pump chamber 318 from low pressure oil rail 356.Internal one-way valve 360 contains four independent valves, and the first outside one-way valve 362 and the second outside one-way valve 363 respectively have two valves, if needed, can adopt the valve of varying number.But the circulation area of internal one-way valve 360 must be the first outside one-way valve 362 and the second outside one-way valve 363 2 times of circulation area separately, because the pumping capacity of inner plunger 242 must be the first outer plunger 295 and the second outer plunger 296 2 times of pumping capacity separately.

Further, the pump housing 302 bottoms are provided with high pressure oil rail 368, and the high pressure oil rail port 369 on high pressure oil rail 368 communicates with high pressure oil storage pool 338 by hydraulic pipe line.High pressure oil rail 368 and three groups of high pressure one-way valves, the outside one-way valve 372 of the outside one-way valve 371, second of internal one-way valve 370, first communicates.Internal one-way valve 370 communicates with internal pump chamber 306 by a passage 373, and 370 of internal one-way valves allow fluid to flow to high pressure oil rail 368 from internal pump chamber 306.The first outside one-way valve 371 communicates with the first outside pump chamber 314 by passage 374, and the first 371, outside one-way valve allows fluid to flow to high pressure oil rail 368 from the first outside pump chamber 314.The second outside one-way valve 372 communicates with the second outside pump chamber 318 by passage 375, and the second 372, outside one-way valve allows fluid to flow to high pressure oil rail 368 from the second outside pump chamber 318.Equally, the circulation area of internal one-way valve 370 must be the first outside one-way valve 371 and the second outside one-way valve 372 2 times of circulation area separately.

Further, pressure transducer 376 is installed on low pressure oil rail 356, for detection of the pressure of low pressure oil rail 356 inner fluids.Equally, pressure transducer 377 is installed on high pressure oil rail 368, for detection of the pressure of high pressure oil rail 368 inner fluids.Pressure transducer 376 is all connected with controller 35 with 377, for receiving and processing pressure signal.

Further, a hydraulic starting control valve 379 is arranged on the pump housing 302, and the place of close low pressure oil rail 356.The hydraulic starting control valve 379 here just schematically shows.Hydraulic starting control valve 379 is connected with the pump housing 302 by four ports on the pump housing 302, and four ports are respectively high pressure port 380, low-pressure port 381, internal pump chamber port 382, outside pump chamber port 383.High pressure port 380 communicates with high pressure oil rail 368 by a fluid passage, and low-pressure port 381 communicates with low pressure oil rail 356 by a fluid passage.Internal pump chamber port 382 communicates with internal pump chamber 306 by the first unlatching and overflow ducts 384, and outside pump chamber port 383 communicates with the first outside pump chamber 314 and the second outside pump chamber 318 by the second unlatching and overflow ducts 385.

Further, hydraulic starting control valve 379 can make high pressure port 380 be communicated with internal pump chamber port 382, and low-pressure port 381 is communicated with outside pump chamber port 383 simultaneously.Hydraulic starting control valve 379 can also make low-pressure port 381 be communicated with internal pump chamber port 382, and high pressure port 380 is communicated with outside pump chamber port 383 simultaneously.Under the third state, passage between hydraulic starting control valve 379 obstruction high pressure port 380, low-pressure port 381 and internal pump chamber port 382, outside pump chamber port 383.Controller 35 can be controlled the working state of hydraulic starting control valve 379.

Further, also contain piston stopper on hydraulic pump body assembly 12, it is provided with a ultimate range at each end of piston stroke, makes its deceleration while also reaching end of travel for piston simultaneously.It is that motion due to free piston engine piston is to be determined by equilibrant that these back-up rings play a role, rather than fixing mechanical approach.The first piston back-up ring 387 of inner carrier assembly 200 is positioned at each end of push-rod hole 304, all comprise the first step part 389 and second step part 394 radially radially, and one from first radially step part 389 extend to second radially the first inclined-plane 397(of step part 394 see Figure 12).The first inclined-plane 397 since second radially step part 394 radially inwardly shrink, extend to the first step part 389 radially always.On push rod 240, have and first the first step 388 radially that radially step part 389 aligns, with second the second step 398 radially that radially step part 394 aligns, and the second inclined-plane 399 between the two.When inner carrier assembly 200 does not stop due to equilibrant, when first radially step 388 with second radially step 398 radially step part 389 is when radially step part 394 contacts separately with second with first, the motion of piston in this direction will stop.This is due at the first radially step 388 and the second radially step 398 and the first step part 389 before radially step part 394 contacts separately with second radially, the fluid entering between the first inclined-plane 397 and the second inclined-plane 399 can be set up rapidly a power, can absorb the remaining kinetic energy of part on inner carrier assembly 200, therefore can reduce significantly or remove the first step 388 and second step 398 and first step part 389 and second shock of step part 394 radially radially radially radially.

Further, the piston stopper on outer piston assembly 250 and the identical structure that has on inner carrier assembly 200.On the first tie rod hole 310 and the second tie rod hole 312, respectively have a pair of radially step part 392 and 393, corresponding, the first outer plunger 295 of the first pull bar 293 and the second pull bar 294 and the second outer plunger 296 parts, respectively have a pair of radially step 390 and 391 being spaced.Same, between two steps of all back-up rings, there is inclined-plane to be connected.

Further, hydraulic pump body assembly 12 also comprises a pair of position transducer.Primary importance sensor 395 is arranged on the pump housing 302, be positioned at first group of copper ring 246 part on the first guide rod 244 near.Second place sensor 396 is arranged on the pump housing 302, be positioned at second group of copper ring 247 part on the second guide rod 245 near.Primary importance sensor 395, second place sensor 396 are connected with controller 35, and provide position signal to it.Controller 35 obtains signal from primary importance sensor 395, thereby can learn position and the speed of inner carrier assembly 200.The signal that second place sensor 396 provides is for proofreading and correct the signal of primary importance sensor 395.

Further, the working principle of motor, because motor is free piston engine 10, the motion of piston is to be decided by the equilibrium of forces acting on inner carrier assembly 200 and outer piston assembly 250.Main active force has: the in-cylinder pressure in opposed cylinder the first cylinder cylinder hole 44 and the second cylinder cylinder hole 144, the frictional force that each movement parts produces, scavenging, inertial force when inner carrier assembly 200 and 250 motion of outer piston assembly, any load that plunger 242, the first outer plunger 295 and the second outer plunger 296 produce.Therefore,, in order to maintain the to-and-fro motion of piston, inner carrier assembly 200 and outer piston assembly 250 must receive in the correct time sizeable Input Forces.In combustion process in the first cylinder cylinder hole 44 and the second cylinder cylinder hole 144, the to-and-fro motion of piston must enough realize required compression.By Input Forces, control the motion of inner carrier assembly 200 and outer piston assembly 250, particularly approach the motion of top dead center position of the end piston of stroke, therefore can control compression ratio.And the variation of compression ratio more easily realizes homogeneous combustion, because compression ratio need to make a change firing chamber according to engine operation condition.Due to equilibrant must be accurate regularly and controlled, for engine efficiency with maintain engine running, controller 35 monitors and driving engine components are very crucial.

Further, before engine start, the fluid of high pressure oil storage pool 338 the insides of hydraulic system 329, in relatively high pressure state, for example, has 35000KPa～42000KPa.The fluid of 330 the insides, low-pressure oil storage pond of hydraulic system 329, in relatively low pressure state, for example, has 350KPa～420KPa.

Further, after engine start, controller 35 gives hydraulic pressure starting control valve door 379 energisings, and according to the working order of motor, hydraulic starting control valve 379 alternately changes between the first valve location and the second valve location.The first valve location state is that high pressure port 380 communicates with internal pump chamber port 382, and low-pressure port 381 communicates with outside pump chamber port 383; The second valve location status is that high pressure port 380 communicates with outside pump chamber port 383, and low-pressure port 381 communicates with internal pump chamber port 382.

Further, at hydraulic starting control valve 379, during in the first valve location, the fluid in high pressure oil storage pool 338 can be pressed in interior pump chamber 306, and the inner plunger 242 promoting on 240 moves right, and therefore makes whole inner carrier assembly 200 start to move right.This will make the fluid in inner couplings pump chamber 308 be pressed in the first coupled outside pump chamber 316 and the second coupled outside pump chamber 320 by the first interconnection passage 322 and the second interconnection passage 323.This will be moved to the left the first outer plunger 295 and the second outer plunger 296 on the first pull bar 293 and the second pull bar 294 separately, therefore makes whole outer piston assembly 250 start to be moved to the left.When outer piston assembly 250 is moved to the left, the fluid in the first outer pump chamber 314 and the second outer pump chamber 318 will be pressed in low-pressure oil storage pond 330 by hydraulic starting control valve 379.

Further, the relative movement meeting of inner carrier assembly 200 and outer piston assembly 250 is moved the first outer piston 252 and the first inner carrier 202 in the first cylinder cylinder hole 44 simultaneously towards their bottom dead center positions separately, meanwhile, the second outer piston 275 in the second cylinder cylinder hole 144 and the second inner carrier 220 can be simultaneously towards they top dead center motions separately.Inner carrier assembly 200 and outer piston assembly 250 all move back and forth along an axis of movement single, straight line.This unique axis of movement extends through the center of two cylinders, as shown in double-head arrow on the first cylinder cylinder hole 44 in Figure 10,11 and the second cylinder cylinder hole 144.

Further, at hydraulic starting control valve 379 during in the second valve location, fluid in high pressure oil storage pool 338 can be pressed in the first outer pump chamber 314 and the second outer pump chamber 318, the first outer plunger 295 and the second outer plunger 296 on the first pull bar 293 and the second pull bar 294 are moved right separately, therefore make whole outer piston assembly 250 start to move right.Fluid in the first coupled outside pump chamber 316 and the second coupled outside pump chamber 320 is pressed in inner couplings pump chamber 308 by the first interconnection passage 322 and the second interconnection passage 323.This will be moved to the left the inner plunger 242 promoting on push rod 240, therefore makes whole inner carrier assembly 200 start to be moved to the left.When inner carrier assembly 200 is moved to the left, the fluid in interior pump chamber 306 can be pressed in low-pressure oil storage pond 330 by hydraulic starting control valve 379.

Further, the relative movement meeting of inner carrier assembly 200 and outer piston assembly 250 is moved the first outer piston 252 and the first inner carrier 202 in the first cylinder cylinder hole 44 simultaneously towards their top dead center positions separately, meanwhile, the second outer piston 275 in the second cylinder cylinder hole 144 and the second inner carrier 220 can be simultaneously towards they lower dead center motions separately.

Further, three valve locations of the conversion hydraulic starting control valve 379 by accurately and fast, inner carrier assembly 200 and outer piston assembly 250 can be realized the compression that hockets in the first cylinder cylinder hole 44 and the second cylinder cylinder hole 144.Controller 35, by monitoring position sensor 288 and 395, obtains position and the velocity information of inner carrier assembly 200 and outer piston assembly 250.Controller 35 these information of application are changed the valve of hydraulic starting control valve 379, the compression ratio that the interior realization in the first cylinder cylinder hole 44 and the second cylinder cylinder hole 144 is needed in due course.By learning above, in the engine start stage, hydraulic starting control valve 379 is being controlled the motion of inner carrier assembly 200 and outer piston assembly 250, and this can make inner carrier assembly 200 and outer piston assembly 250 need to move according to engine running.

Further, motor turns round as two stroke engine, without any independent valve mechanism, opens and closes suction port and the relief opening on the first cylinder cylinder hole 44 and the second cylinder cylinder hole 144.The ventilation (comprising air inlet and exhaust) of therefore, compression, burning (comprise and light), expansion, fuel oil and air mixture all completes in two strokes of piston.Such layout makes movement parts minimum number, makes the overall dimensions of motor minimize simultaneously.

Further, the motion of inner carrier assembly 200 makes the first inner carrier 202 and the second inner carrier 220 selectively open and close the relief opening 46 and 146 on the first cylinder cylinder hole 44 and the second cylinder cylinder hole 144.The motion of outer piston assembly 250 makes the first outer piston 252 and the second outer piston 275 selectively open and close the suction port 56 and 156 on the first cylinder cylinder hole 44 and the second cylinder cylinder hole 144, and first piston pin 164 and the second wrist pin 282 are air intake pressurized simultaneously.The motion of outer piston assembly 250 makes the first outer piston 252 and the second outer piston 275 selectively open and close the oil sprayer 34 and 134 on the first cylinder cylinder hole 44 and the second cylinder cylinder hole 144.Therefore, hydraulic starting control valve 379 is controlled the motion of inner carrier assembly 200 and outer piston assembly 250, pressurized air is entered in the first cylinder cylinder hole 44 and the second cylinder cylinder hole 144, fuel oil is entered in cylinder and mix with pressurized air, and there is burning in compression fully.

Further, combustion process, in normal working, is carried out under homogeneous compression-ignition conventionally, utilizes the advantage of variable compression ratio of engines to make motor carry out high efficiency burning.Owing to there being higher compression ratio, in homogeneous compression-ignition process, gas mixture can be lighted automatically uniformly; That is to say the compressed temperature that is heated to automatic ignition of premixed gas mixture.Because mixed gas in homogeneous compression-ignition process is spontaneous combustion, so gas mixture inside has just formed a lot of burning-points, can guarantee rapid combustion, owing to no longer needing flame propagation, this makes to adopt low equivalent proportion (ratio of actual mixing ratio and chemically correct fuel).Improving the advantage that the thermal efficiency reduces cylinder maximum temperature is simultaneously, compares with traditional type internal-combustion engine, has significantly reduced the formation of oxynitrides.If needed, on each cylinder, spark plug can be installed, motor can turn round as the internal-combustion engine of spark ignition.

Further, in homogeneous compression-ignition process, during normal working of engine, the motion of the first outer piston 252 not only makes the first cylinder cylinder hole 44 can air inlet, and has determined the moment and the endurance that suction port 56 and the first oil sprayer 34 are opened.When top dead center when motion of the first outer piston 252 towards it, the volume of the main pump chamber 78 of the first scavenging pump 74, becoming large, makes air enter in main pump chamber 78 by air inlet leaf valve 94.

Further, the first outer piston 252 arrives atdc, the particularly motion after burning, and the volume of main pump chamber 78 is being diminished, and the air of the inside is compressed and extrude, and by the leaf valve 95 of giving vent to anger enter gas-entered passageway 93 and 72 and air inlet ring 31 in.When the first outer piston 252 continues the bottom dead center position motion to it, will open suction port 56, the pressurized air in air inlet ring 31 is flowed in the first cylinder cylinder hole 44.Meanwhile, the first oil sprayer 34 also can be exposed in the first cylinder cylinder hole 44.Controller 35 will activate the first oil sprayer 34, and fuel oil is injected in cylinder.Controller 35 utilizes position transducer 291 and fuel pressure transmitter 41 to decide the moment and the injection duration of oil spout.

Further, the first outer piston 252 arrives after bottom dead center, and the top dead center to it moves again.In movement process, the first outer piston 252 is by suction port 56 and the nozzle opening 54 of closing in the first cylinder cylinder hole 44.When the first outer piston 252 continues to move to top dead center, gas mixture can be compressed.It should be noted that the first oil sprayer 34 directly sprays into fuel oil in the first cylinder cylinder hole 44, but it is not directly exposed in burning, because when the first outer piston 252 is when approaching top dead center position, the first oil sprayer 34 can be sheltered from by the first outer piston 252.

Further, the motion of the first inner carrier 202 has determined that relief opening 46 is in the first 44 interior start-up time and endurance of cylinder cylinder hole.When the first inner carrier 202 leaves top dead center, particularly, after burning, the first inner carrier 202 can, through relief opening 46, make waste gas pass through relief opening 46 and discharge.Waste gas is discharged by the first waste gas spiral outlet 20 and remaining vent systems (not shown).The first inner carrier 202 arrives after bottom dead center, again, to top dead center motion, in movement process, can effectively close relief opening 46.This moment, do not have the waste gas of discharging can be left in the first cylinder cylinder hole 44, upper, as internal exhaust gas recirculation, use while once burning.When the first inner carrier 202 continues to top dead center motion, gas mixture can be compressed.

Further, because the working order in the second cylinder cylinder hole 144 is contrary with the first cylinder cylinder hole 44, burning in the first cylinder cylinder hole 44 make the first inner carrier 202 and the second inner carrier 252 towards each other away from direction motion, and burning in the second cylinder cylinder hole 144 makes the close direction motion (causing the compression in the first cylinder cylinder hole 44) towards each other of the first inner carrier 202 and the second inner carrier 252, therefore the work cycle of motor is continued.Various operating modes while considering engine running, maintain the running of motor by controlling combustion oil injection before burning.Control fuel oil and spray and can be used for the length of control piston stroke, the stroke of piston is essential enough to obtain the required compression ratio that burns, but will avoid colliding with piston stopper.Certainly have cas fortuit and occur, as combustion once in a while, system is uneven or other situation, at this moment, hydraulic starting control valve 379 works, and comes together to correct the motion of piston with fuel oil control measure.This is not only included under given Operation Conditions suitable compression ratio is provided, and is also included in top dead center or atdc generation spontaneous combustion and with the burning energy that avoids waste, the moving direction of inner carrier assembly 200 and outer piston assembly 250 is changed.If too many kinetic energy passes to inner carrier assembly 200 and outer piston assembly 250, the fluid energy absorption portion of piston stopper the inside or whole energy at that time, piston and back-up ring can bump if desired.

Further, during normal working of engine, when burning makes inner carrier assembly 200 and 250 to-and-fro motion of outer piston assembly, push rod 240 and the first pull bar 293, the second pull bar 294 make plunger 242, the first outer plunger 295 and the second outer plunger 296 in they hole 304,310 and 312 interior to-and-fro motion separately.When inner carrier assembly 200 moves right, the motion of inner plunger 242 is opened inner low pressure check valve 360, and fluid is entered in internal pump chamber 306 from low pressure oil rail 356.Low-pressure oil storage pond 330 can supplement the fluid from the 356 interior outflows of low pressure oil rail.The fluid of low pressure oil rail 356 interior storages and low-pressure oil storage pond 330 supplement the ability of low pressure oil rail 356 must enough pass through low pressure check valve 360 to maintain fluid, otherwise, there will be cavitation.

Further, outer piston assembly 250 is to left movement time, the first outer plunger 295 and the second outer plunger 296 make the fluid in the first outside pump chamber 314 and the second outside pump chamber 318 enter in high pressure oil rail 368 by the first external high pressure one-way valve 371 and the second external high pressure one-way valve 372, and the fluid of high pressure oil rail 368 interior equivalent enters in high pressure oil storage pool 338 again.High-pressure liquid in high pressure oil storage pool 338 can be used as the energy storage source of engine running, also can drive miscellaneous part and system.Because hydraulic oil available energy is the function of hydraulic fluid pressure and flow, when initial design motor relative dimensions, can utilize required output energy to decide the size of the stroke of piston, the frequency of piston or hydraulic pump plunger.In general, the piston assembly quality of motion is larger, and the operating frequency of motor the best is lower.

Further, when during engine running, inner carrier assembly 200 moves right, inner plunger 242 pump the fluid in inner couplings pump chamber 306 and enter the first coupled outside pump chamber 316 and the second coupled outside pump chamber 320 in.Just, as above-mentioned, this makes inner carrier assembly 200 and outer piston assembly 250 maintain a kind of relative movement state.If position transducer 288 and 395 detects inner carrier assembly 200 and outer piston assembly 250 does not have in middle position, cylinder hole, a meeting in the first coupling regulating valve 328 and the first coupling regulating valve 336 is activated to adjust the skew of piston so.

Further, during the next stroke of motor, when inner carrier assembly 200 is moved to the left, the pressure flow cognition that inner plunger 242 produces is opened internal high pressure one-way valve 370, makes fluid enter high pressure oil rail 368, and then enters high pressure oil storage pool 338.Meanwhile, outer piston assembly 250 moves right, and the first outer plunger 295 and the second outer plunger 296 make the fluid in low pressure oil rail 356 pass through the first outer low pressure one-way valve 362 and the second outer low pressure one-way valve 363.During this stroke of motor, the first outer plunger 295 and the second outer plunger 296 can pump into the fluid in the first coupled outside pump chamber 316 and the second coupled outside pump chamber 320 in inner couplings pump chamber 306.

Further, because inner carrier assembly 200 is always contrary with outer piston assembly 250 moving direction, inner plunger 242 is also always contrary with the moving direction of the first outer plunger 295, the second outer plunger 296, therefore in each stroke of motor, only has in inner plunger 242 or the first outer plunger 295, the second outer plunger 296 one to high pressure oil storage pool 338 pumps oil.In each case, all can be to coupled system pump oil.On the other hand, if want to make inner plunger 242, the first outer plunger 295 and the second outer plunger 296 all oily to high pressure oil storage pool 338 pumps at both direction, need to apply different coupled systems.

Further, during engine running, except the subsystem work of engine interior, external engine system also work on demand to maintain the running of motor.Therefore, cooling system pumping cooling liquid is on demand not overheated to guarantee engine components by cooling channel 28,50,128,150,352 and air ring 66,166.In addition, oil-fired system 39 will store fuel oil and provide the fuel oil of required pressure for the first oil sprayer 34 and the second oil sprayer 134.Electrical system will provide power supply so that its work for controller 35, sensor and miscellaneous part.Lubrication system can provide required lubricant oil to lubricate some component for motor.During engine running, gas handling system can provide required clean air for suction port 92 and 192.

Further, although in disclosed embodiment, be hydraulic oil as the fluid of energy storage medium and control valve, if needed, other suitable fluids also can be applied.For example, described fluid can be gas, and oil storage pool can be a pneumatic energy stocking system.The refrigeration agent that fluid also exists with liquid or gaseous state.In these two examples, because fluid is no longer liquid (conventionally incompressible), for the coupled system of 2 opposed motions of piston assembly must be changed.Yet the opposed cylinder type free piston engine of opposed pistons, particularly applies the motor of bump combustion chamber, still can be used to produce power and be stored in fluid energy storage medium the inside.

The foregoing is only preferred embodiment of the present invention, not thereby limit claim of the present invention, so the equivalent structure that all utilizations specification of the present invention and diagramatic content are made changes, be all included in protection scope of the present invention.

Claims (5)

1. the piston stopper of a free piston engine, it is characterized in that, comprise the free piston engine being formed by hydraulic pump body assembly, the first cylinder assembly, the second cylinder assembly, described the first cylinder assembly is connected in a side of described hydraulic pump body assembly, and described the second cylinder assembly is connected in the opposite side of described hydraulic pump body assembly; Described the first cylinder assembly comprises the first cylinder, described the first cylinder bearing of trend is parallel to axis of movement, described the second cylinder assembly comprises the second cylinder, described the second cylinder bearing of trend is parallel to axis of movement, in described the first cylinder and described the second cylinder, is respectively equipped with inner carrier assembly and outer piston assembly; Described inner carrier assembly comprises the inner carrier being fixed on through on the push rod of described hydraulic pump body assembly, the top of described inner carrier is towards the direction away from described hydraulic pump body assembly, described inner carrier assembly is provided with first piston back-up ring, described outer piston assembly comprises wrist pin, pull bar and outer piston, described outer piston is connected with described pull bar by described wrist pin, the top of described outer piston is towards described inner carrier, and described outer piston assembly is provided with the second piston stopper.

2. the piston stopper of free piston engine as claimed in claim 1, it is characterized in that, described first piston back-up ring is positioned at the end of the push-rod hole on described hydraulic pump body assembly, described first piston back-up ring is provided with the first step part and second step part radially radially, described push rod be provided with described first radially step part match first radially step and with described second the second step radially that radially step part matches, the described push rod in described push-rod hole has been full of hydraulic oil around.

3. the piston stopper of free piston engine as claimed in claim 1, it is characterized in that, a part for described pull bar is fixed on described outer piston, another part comprises a plunger of being located in tie rod hole, described plunger and described tie rod hole play the effect of sealing jointly, described the second piston stopper is located at the end of described tie rod hole, described the second piston stopper is provided with the 3rd step part and the 4th step part radially radially, described pull bar be provided with the described the 3rd radially step part match the 3rd radially step and with the described the 4th the 4th step radially that radially step part matches, described pull bar in described tie rod hole has been full of hydraulic oil around.

4. the piston stopper of free piston engine as claimed in claim 2, it is characterized in that, described first piston back-up ring is provided with the first inclined-plane, described the first inclined-plane from described first radially step part extend to the described second step part radially, described push rod is provided with the second inclined-plane matching with described the first inclined-plane, described the second inclined-plane from described first radially step extend to the second step radially.

5. the piston stopper of free piston engine as claimed in claim 3, it is characterized in that, described the second piston stopper is provided with the 3rd inclined-plane, described the 3rd inclined-plane from the described the 3rd radially step part extend to the described the 4th step part radially, described push rod is provided with the 4th inclined-plane matching with described the 3rd inclined-plane, described the 4th inclined-plane from the described the 3rd radially step extend to the 4th step radially.