CN104632380A - Internal combustion engine with horizontally and oppositely arranged connecting rods and oppositely arranged cylinders - Google Patents

Internal combustion engine with horizontally and oppositely arranged connecting rods and oppositely arranged cylinders Download PDF

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Publication number
CN104632380A
CN104632380A CN201510064812.7A CN201510064812A CN104632380A CN 104632380 A CN104632380 A CN 104632380A CN 201510064812 A CN201510064812 A CN 201510064812A CN 104632380 A CN104632380 A CN 104632380A
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CN
China
Prior art keywords
opposed
connecting rod
combustion engine
internal combustion
horizontally
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Pending
Application number
CN201510064812.7A
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Chinese (zh)
Inventor
白云龙
王平
冯京
韩荣华
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SHAANXI JUZHEN POWER TECHNOLOGY CO., LTD.
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白云龙
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Priority to CN201510064812.7A priority Critical patent/CN104632380A/en
Publication of CN104632380A publication Critical patent/CN104632380A/en
Pending legal-status Critical Current

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Abstract

The invention provides an internal combustion engine with horizontally and oppositely arranged connecting rods and oppositely arranged cylinders and belongs to the field of internal combustion engines and air compressors. The internal combustion engine comprises a crankcase which is provided with a crankshaft and the plurality of pairs of cylinders which are oppositely arranged, and the crankshaft comprises a plurality of crank throws. Each crank throw is connected with the two corresponding connecting rods which are connected with pistons respectively, wherein the two pistons are located on the two sides of the crankshaft respectively and are connected in the corresponding pair of oppositely arranged cylinders in a sliding mode respectively. According to the internal combustion engine with the horizontally and oppositely arranged connecting rods and the oppositely arranged cylinders, one crank throw is connected with the two corresponding connecting rods, all the parts are connected compactly, machining and assembling are very convenient, the working efficiency is greatly improved, and the defects of an existing internal combustion engine are effectively overcome. Meanwhile, the internal combustion engine with the horizontally and oppositely arranged connecting rods and the oppositely arranged cylinders has the gasoline compression ignition effect, spark ignition is not needed, and gasoline can spontaneously burn through the high temperature generated by compression.

Description

A kind of horizontally-opposed connecting rod and opposed cylinder internal combustion engine
Technical field
The present invention relates to internal-combustion engine and field of air compressor, in particular to the horizontally-opposed connecting rod of one and opposed cylinder internal combustion engine.
Background technique
Internal-combustion engine is a kind of dynamic power machine, and it is by making fuel burn at machine intimate, and the heat energy of being released directly is converted to the heat engine of power.The kind of internal-combustion engine is very various, and common petrol engine, diesel engine are typical internal-combustion engines.
But, the most complex structure of existing internal-combustion engine, processing and assembling difficulty, and mechanical efficiency is lower.
Summary of the invention
The object of the present invention is to provide a kind of structure simple, horizontally-opposed connecting rod easy to assembly and opposed cylinder internal combustion engine, to improve the problems referred to above.
The present invention is achieved in that
This horizontally-opposed connecting rod and opposed cylinder internal combustion engine comprise crankcase, described crankcase is provided with bent axle and some cylinder bodies to being oppositely arranged, described bent axle comprises multiple crank throw, each crank throw is all connected with two connecting rods, two connecting rods are connected to piston, and two pistons lay respectively at the both sides of described bent axle and are slidably connected to respectively in the cylinder body of pair of opposing.
The bent axle of existing internal-combustion engine is generally that a crank throw connects a connecting rod, this just causes its volume larger, complex structure, high expensive, and processing and assembling difficulty, and a crank throw connects two connecting rods in this horizontally-opposed connecting rod and opposed cylinder internal combustion engine, this is just from the structure that greatly simplify whole internal-combustion engine, makes it process and assembles convenient.
Further, described crankcase is provided with four cylinder bodies, two the cylinder body shaft axiss be wherein oppositely arranged overlap and are arranged at the both sides of described bent axle respectively.
The object that cylinder body is set like this be to make this horizontally-opposed connecting rod and opposed cylinder body Structure of Internal-Combustion Engine simply compact, processing and assembling is convenient, and mechanical efficiency is higher.
Further, described crankcase is provided with the cooling bath for cylinder body heat radiation, described cooling bath is communicated with cooling liquid inlet and cooling liquid outlet.
The object arranging cooling bath is to cool in running order cylinder body, thus avoids it to affect the normal operation of this horizontally-opposed connecting rod and opposed cylinder internal combustion engine because temperature is too high.
Further, the output terminal of described bent axle is provided with timing gear, and described timing gear have two, and the length direction interval along described bent axle is arranged.
It has transmission accurately to adopt the object of timing gear to be, efficiency is high, compact structure, reliable operation, the feature that the life-span is long, and the object arranging two is the stability and the reliability that improve transmission.
Further, the sidewall of described piston is provided with multiple circular groove, is provided with seal ring in described circular groove, described seal ring is teflin ring.
The object arranging multiple seal ring is that the pollutant avoiding burning generation enters crankcase through the gap piston and cylinder body, thus ensures the normal work of crankshaft-and-connecting-rod, the working life of both prolongations.
Further, described connecting rod is connected by wrist pin with piston, described wrist pin is removably connected with two limited posts.
When the object arranging limited post is to prevent piston movement, wrist pin affects the stability that piston is connected with connecting rod because moving axially, and ensures the normal operation of this horizontally-opposed connecting rod and opposed cylinder internal combustion engine.
Further, described connecting rod comprise connect successively major part, shaft and microcephaly, the joint of the joint of described major part and shaft and shaft and microcephaly all adopts arc transition.
The object arranging circular arc is to avoid connecting rod stress concentration, optimizes the mechanical property of connecting rod, extends the working life of connecting rod.
Further, the major part of described connecting rod is provided with the attachment hole mated with described crank throw, and the edge of described attachment hole is provided with annular protrusion integrated with described connecting rod.
The object arranging annular protrusion is to reduce to be connected to the area of contact between two connecting rods on same crank throw, reduces frictional force between the two, slows down wearing and tearing between the two, the working life of both prolongations.
Further, described crankcase is provided with bent axle bearing, described bent axle bearing is provided with mounting hole, described bent axle comprises the axle journal mated with described mounting hole, is provided with sliding bearing between the inwall of described mounting hole and axle journal.
The object that sliding bearing is set be to make bent axle can relative to bent axle bearing steadily, reliable, relatively rotate to noiseless.
Further, the sidewall of described sliding bearing is provided with oilhole, described oilhole has multiple, along length direction and the setting of circumferencial direction interval of described sliding bearing.
The object arranging multiple oilhole is bent axle is directly contacted with the undeveloped life of the lubricated oil content of the slidingsurface of sliding bearing, thus the frictional loss that can greatly reduce between the two and surface abrasion.
The invention has the beneficial effects as follows:
This horizontally-opposed connecting rod and opposed cylinder internal combustion engine adopt cylinder body to be relatively arranged on bent axle both sides and crank throw connects the structure of two connecting rods, connect compact between each parts, process and assemble all very convenient, and workmanship efficiency improves greatly, efficiently solves the defect of existing internal-combustion engine.Meanwhile, this horizontally-opposed connecting rod and opposed cylinder internal combustion engine also have the effect of gasoline compression ignite, namely do not need spark ignition, and the high temperature only relying on compression to produce just can make gasoline generation spontaneous combustion.
Accompanying drawing explanation
In order to be illustrated more clearly in the technological scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
The structural representation of the horizontally-opposed connecting rod that Fig. 1 provides for first embodiment of the invention and opposed cylinder internal combustion engine;
The structural representation of the horizontally-opposed connecting rod that Fig. 2 provides for first embodiment of the invention and opposed cylinder body internal combustion engines;
The structural representation of another angle of the horizontally-opposed connecting rod that Fig. 3 provides for first embodiment of the invention and opposed cylinder body internal combustion engines;
The structural representation of the crankcase bodies that Fig. 4 provides for first embodiment of the invention;
The structural representation of the clamp that Fig. 5 provides for first embodiment of the invention;
The connection diagram of the bent axle that Fig. 6 provides for first embodiment of the invention, connecting rod and piston;
The structural representation of the connecting rod that Fig. 7 provides for first embodiment of the invention.
Reference character gathers:
Crankcase bodies 100; Clamp 200; Bent axle 300;
Connecting rod 400; Piston 500; Cylinder body 600;
Timing gear 700.
Embodiment
The general crank throw of existing internal-combustion engine connects a connecting rod 400, thus causes its complex structure, processing and assembling difficulty, and mechanical efficiency is lower.
For above-mentioned situation, the technical program provides a kind of horizontally-opposed connecting rod and opposed cylinder internal combustion engine, and this horizontally-opposed connecting rod and opposed cylinder internal combustion engine adopt a crank throw to connect the structure of two connecting rods 400, compact structure, processing is simple, with low cost, easy to assembly.
For making the object of the embodiment of the present invention, technological scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technological scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.The assembly of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to define further it and explain in accompanying drawing subsequently.
In describing the invention, it should be noted that, term " " center ", " on ", D score, " left side ", " right side ", " vertically ", " level ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, or this invention product orientation of usually putting or position relationship when using, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.In addition, term " first ", " second ", " the 3rd " etc. only for distinguishing description, and can not be interpreted as instruction or hint relative importance.
In describing the invention, also it should be noted that, unless otherwise clearly defined and limited, term " setting ", " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
First embodiment, with reference to Fig. 1-7, this horizontally-opposed connecting rod and opposed cylinder internal combustion engine comprise crankcase, described crankcase is provided with bent axle 300 and some cylinder bodies 600 to being oppositely arranged, described bent axle 300 comprises multiple crank throw, each crank throw is all connected with two connecting rods, 400, two connecting rods 400 and is connected to piston 500, two pistons 500 lay respectively at the both sides of described bent axle 300 and are slidably connected to respectively in the cylinder body 600 of pair of opposing.
Wherein, described crankcase entirety, in cuboid shape, comprises crankcase bodies 100 and the clamp 200 be removably connected on described crankcase bodies 100; Described crankcase bodies 100 and clamp 200 are respectively arranged with the cavity rotated for described bent axle 300 and connecting rod 400, and above-mentioned two cavitys together form the assembly department of bent axle 300, and described assembly department is communicated with described cylinder body 600; The casing of described crankcase is provided with multiple mounting hole, so that the connection of itself and external structure; One end of described bent axle 300 has been bolted flywheel, to reduce the speed fluctuation in bent axle 300 rotation process; The both sides of described crank throw are provided with equilibrium block, to reduce the Oscillation Amplitude after bent axle 300 High Rotation Speed and frequency; Sliding bearing is provided with, to ensure both fluencies in relative rotation between described crank throw and connecting rod 400.
Working principle and the process of this horizontally-opposed connecting rod and opposed cylinder internal combustion engine are such: first piston 500 does straight reciprocating motion under the promotion of the energy of burning generation in cylinder body 600; Then connecting rod 400 operates under the promotion of piston 500 in crankcase; Last bent axle 300 under the promotion of connecting rod 400 in crankcase high speed rotating.By said process, the chemical energy that burning produces just is converted into the mechanical energy of bent axle 300, and above-mentioned mechanical energy just can provide power for external equipment after exporting.
The bent axle 300 of existing internal-combustion engine is generally that a crank throw connects a connecting rod 400, this just causes its volume larger, complex structure, high expensive, and processing and assembling difficulty, and a crank throw connects two connecting rods 400 in this horizontally-opposed connecting rod and opposed cylinder internal combustion engine, this is just from the structure that greatly simplify whole internal-combustion engine, makes it process and assembles convenient.
In the present embodiment, described crankcase is provided with four cylinder bodies 600, two cylinder body 600 shaft axiss be wherein oppositely arranged overlap and are arranged at the both sides of described bent axle 300 respectively.
Wherein, four cylinder bodies 600 between two one group be symmetrically set, correspondingly, four pistons 500 are also symmetrically set, and four connecting rods 400 are also symmetrically set.
The object that cylinder body 600 is set like this be to make this horizontally-opposed connecting rod and opposed cylinder body Structure of Internal-Combustion Engine simply compact, processing and assembling is convenient, and mechanical efficiency is higher.
In the present embodiment, described crankcase is provided with the cooling bath dispelled the heat for cylinder body 600, described cooling bath is communicated with cooling liquid inlet and cooling liquid outlet.
Wherein, described cooling bath is arranged around described cylinder body 600, thus makes cooling effect reach optimization; Described cooling liquid inlet and cooling liquid outlet are arranged at the both sides of corresponding cylinder body 600 respectively, to facilitate the flowing of cooling liquid in cooling bath.
The object arranging cooling bath is to cool in running order cylinder body 600, thus avoids it to affect the normal operation of this horizontally-opposed connecting rod and opposed cylinder internal combustion engine because temperature is too high.
In the present embodiment, the output terminal of described bent axle 300 is provided with timing gear 700, and described timing gear 700 have two, and the length direction interval along described bent axle 300 is arranged.
Wherein, described timing gear 700 connect and drive the camshaft for controlling valve opening and closing; Be provided with stop collar between two timing gear 700, described timing gear 700 and stop collar are connected on the output terminal of described bent axle 300 by flat key; Two timing gear 700 are provided with center hole, be provided with and the integrated stiffening ring of described timing gear 700, to increase the intensity of timing gear 700, extend its working life around described center hole.
It has transmission accurately to adopt the object of timing gear 700 to be, compact structure, reliable operation, the feature that the life-span is long, and the object arranging two is the stability and the reliability that improve transmission.
In the present embodiment, the sidewall of described piston 500 is provided with multiple circular groove, is provided with seal ring in described circular groove, described seal ring is teflin ring.
Wherein, the cross section of described circular groove is rectangular, to process; Multiple circular groove is arranged along the short transverse uniform intervals of described piston 500; Described polytetrafluoroethylmaterial material has excellent antiacid alkali resistant and high and low temperature resistance, can be applicable to the working environment of piston 500 well, meanwhile, its friction factor is extremely low, greatly can reduce the frictional force between piston 500 and cylinder body 600, be beneficial to very much the high-speed motion of piston 500.
The object arranging multiple seal ring is that the pollutant avoiding burning generation enters crankcase through the gap piston 500 and cylinder body 600, thus ensures the normal work of bent axle 300 and connecting rod 400, the working life of both prolongations.
It should be noted that, above-mentioned teflin ring is mainly used in field of air compressor, and in field of internal combustion engine, described seal ring generally selects steel piston ring.
In the present embodiment, described connecting rod 400 is connected by wrist pin with piston 500, described wrist pin is removably connected with two limited posts.
Wherein, described piston 500 is provided with two piston holes mated with described wrist pin; Two limited posts are cylindrical and outer wall is provided with outside thread, described wrist pin are provided with the internal thread mated with described outside thread; When connecting described piston 500 and connecting rod 400, first wrist pin is passed piston hole, connecting rod 400 and another piston hole successively, be then rotatably connected on wrist pin by two limited posts, now, two limited posts prop up the inwall of piston 500 respectively.
When the object arranging limited post is to prevent piston 500 from moving, wrist pin affects the stability that piston 500 is connected with connecting rod 400 because moving axially, and ensures the normal operation of this horizontally-opposed connecting rod and opposed cylinder internal combustion engine.
In the present embodiment, described connecting rod 400 comprise connect successively major part, shaft and microcephaly, the joint of the joint of described major part and shaft and shaft and microcephaly all adopts arc transition.
Wherein, described microcephaly is provided with the first rotation hole mated with described wrist pin; Described major part comprises and the integrated fixing part of described shaft and the active part be removably connected on described fixing part; The cross section of described shaft is " work " font, to increase the intensity of whole connecting rod 400; Described shaft is curved, can arrange by full symmetric with the piston 500 and cylinder body 600 that make to be connected to two connecting rods 400 on same crank throw and above-mentioned two connecting rod 400 correspondences.
The object arranging circular arc is to avoid connecting rod 400 stress concentration, optimizes the mechanical property of connecting rod 400, extends the working life of connecting rod 400.
In the present embodiment, the major part of described connecting rod 400 is provided with the attachment hole mated with described crank throw, and the edge of described attachment hole is provided with and the integrated annular protrusion of described connecting rod 400.
Wherein, described attachment hole is bolted rear jointly to be formed by described fixing part and active part; Outer ledge and the large head surface of described annular protrusion adopt chamfered transition, to increase the intensity of connecting rod 400.
The object arranging annular protrusion is to reduce to be connected to the area of contact between two connecting rods 400 on same crank throw, reduces frictional force between the two, slows down wearing and tearing between the two, the working life of both prolongations.
In the present embodiment, described crankcase is provided with bent axle bearing, described bent axle bearing is provided with mounting hole, described bent axle 300 comprises the axle journal mated with described mounting hole, is provided with sliding bearing between the inwall of described mounting hole and axle journal.
Wherein, described bent axle bearing can be shaped on described crankcase, also can be removably connected on described crankcase; Described mounting hole is formed jointly by described crankcase bodies 100 and clamp 200; The inwall of described mounting hole is provided with the sliding bearing of two semi-circular shape, two sliding bearings are arranged on described crankcase bodies 100 and clamp 200 respectively; The inwall of described sliding bearing is provided with friction reducing material, to reduce the frictional force between bent axle bearing and bent axle 300.
The object that sliding bearing is set be to make bent axle 300 can relative to bent axle bearing steadily, reliable, relatively rotate to noiseless.
In the present embodiment, the sidewall of described sliding bearing is provided with oilhole, described oilhole has multiple, along length direction and the setting of circumferencial direction interval of described sliding bearing.
Wherein, multiple oilhole is all rounded, to facilitate machine shaping; Described oilhole can be through hole, also can for being arranged at the blind hole on described sliding bearing inwall; Can store a certain amount of lubricant oil in described oilhole, when described bent axle 300 rotates relative to sliding bearing, above-mentioned lubricant oil can contact and lubricate bent axle 300 surface.
The object arranging multiple oilhole is bent axle 300 is directly contacted with the undeveloped life of the lubricated oil content of the slidingsurface of sliding bearing, thus the frictional loss that can greatly reduce between the two and surface abrasion.Meanwhile, oil film also has certain vibration absorption ability, can improve bent axle 300 and sliding bearing stationarity in relative rotation.
This horizontally-opposed connecting rod and opposed cylinder internal combustion engine adopt cylinder body 600 to be relatively arranged on bent axle 300 both sides and crank throw connects the structure of two connecting rods 400, connect compact between each parts, process and assemble all very convenient, and workmanship efficiency improves greatly, efficiently solve the defect of existing internal-combustion engine.Meanwhile, this horizontally-opposed connecting rod and opposed cylinder internal combustion engine also have the effect of gasoline compression ignite, namely do not need spark ignition, and the high temperature only relying on compression to produce just can make gasoline generation spontaneous combustion.
Second embodiment, the device that the embodiment of the present invention provides, its technique effect realizing principle and generation is identical with the first embodiment, is concise and to the point description, and the not mentioned part of device embodiment part can with reference to corresponding contents in the first embodiment.
In the present embodiment, described crankcase is provided with eight cylinder bodies 600, two cylinder body 600 shaft axiss be wherein oppositely arranged overlap and are arranged at the both sides of described bent axle 300 respectively.
Wherein, eight cylinder body 600 quaternions are symmetrically set, and correspondingly, eight pistons 500 are also symmetrically set, and eight connecting rods 400 are also symmetrically set.
The object that cylinder body 600 is set like this be to make this horizontally-opposed connecting rod and opposed cylinder body Structure of Internal-Combustion Engine simply compact, processing and assembling is convenient, and mechanical efficiency is higher.
It should be noted that, above-mentioned cylinder body 600 also can arrange six, ten, 12 etc., specifically determines according to the actual demand of user.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a horizontally-opposed connecting rod and opposed cylinder internal combustion engine, it is characterized in that, comprise crankcase, described crankcase is provided with bent axle and some cylinder bodies to being oppositely arranged, described bent axle comprises multiple crank throw, each crank throw is all connected with two connecting rods, two connecting rods are connected to piston, and two pistons lay respectively at the both sides of described bent axle and are slidably connected to respectively in the cylinder body of pair of opposing.
2. the horizontally-opposed connecting rod of one according to claim 1 and opposed cylinder internal combustion engine, is characterized in that, described crankcase is provided with four cylinder bodies, and two the cylinder body shaft axiss be wherein oppositely arranged overlap and are arranged at the both sides of described bent axle respectively.
3. the horizontally-opposed connecting rod of one according to claim 1 and opposed cylinder internal combustion engine, is characterized in that, described crankcase is provided with the cooling bath for cylinder body heat radiation, described cooling bath is communicated with cooling liquid inlet and cooling liquid outlet.
4. the horizontally-opposed connecting rod of one according to claim 1 and opposed cylinder internal combustion engine, is characterized in that, one end of described bent axle is provided with timing gear, and described timing gear have two, and the length direction interval along described bent axle is arranged.
5. the horizontally-opposed connecting rod of one according to claim 1 and opposed cylinder internal combustion engine, is characterized in that, the sidewall of described piston is provided with multiple circular groove, is provided with seal ring in described circular groove, and described seal ring is teflin ring.
6. the horizontally-opposed connecting rod of one according to claim 1 and opposed cylinder internal combustion engine, is characterized in that, described connecting rod is connected by wrist pin with piston, described wrist pin is removably connected with two limited posts.
7. the horizontally-opposed connecting rod of one according to claim 1 and opposed cylinder internal combustion engine, it is characterized in that, described connecting rod comprise connect successively major part, shaft and microcephaly, the joint of the joint of described major part and shaft and shaft and microcephaly all adopts arc transition.
8. the horizontally-opposed connecting rod of one according to claim 7 and opposed cylinder internal combustion engine, it is characterized in that, the major part of described connecting rod is provided with the attachment hole mated with described crank throw, and the edge of described attachment hole is provided with annular protrusion integrated with described connecting rod.
9. the horizontally-opposed connecting rod of one according to claim 1 and opposed cylinder internal combustion engine, it is characterized in that, described crankcase is provided with bent axle bearing, described bent axle bearing is provided with mounting hole, described bent axle comprises the axle journal mated with described mounting hole, is provided with sliding bearing between the inwall of described mounting hole and axle journal.
10. the horizontally-opposed connecting rod of one according to claim 9 and opposed cylinder internal combustion engine, it is characterized in that, the sidewall of described sliding bearing is provided with oilhole, and described oilhole has multiple, along length direction and the setting of circumferencial direction interval of described sliding bearing.
CN201510064812.7A 2015-02-09 2015-02-09 Internal combustion engine with horizontally and oppositely arranged connecting rods and oppositely arranged cylinders Pending CN104632380A (en)

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CN201510064812.7A CN104632380A (en) 2015-02-09 2015-02-09 Internal combustion engine with horizontally and oppositely arranged connecting rods and oppositely arranged cylinders

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WO2017088800A1 (en) * 2015-11-24 2017-06-01 白云龙 Horizontally and fully symmetrically configured range extender
WO2017088801A1 (en) * 2015-11-24 2017-06-01 白云龙 Horizontally and symmetrically arranged range extender

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