CN110295996B

CN110295996B - Swing arm cam type two-stroke straight shaft internal combustion engine

Info

Publication number: CN110295996B
Application number: CN201910558882.6A
Authority: CN
Inventors: 郝凤成
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2022-02-11
Anticipated expiration: 2039-06-14
Also published as: CN110295996A

Abstract

A swing arm cam type two-stroke straight shaft internal combustion engine is a further improvement on the basis of a 346 swing arm type two-stroke straight shaft internal combustion engine, a single-track elliptical cam on a straight shaft is matched with a single arc-shaped slideway on a swing arm, a complex operation mode that 346 swing arm type double tracks are mutually connected and matched is replaced, continuous contact operation is performed in one rotation of the engine, the operation stability of the engine is increased, the operation noise is completely eliminated, the manufacturing process of core components of the engine is greatly simplified, the manufacturing cost is further greatly reduced, the arm of force of the elliptical cam is further lengthened, and the mechanical efficiency is further improved. Meanwhile, the improvement of a single-track elliptical cam and a single-arc-shaped slideway swing arm is made for 4 models in a unit series and 3 models in a unit series. Compared with the crankshaft internal combustion engine with the same volume, the mechanical efficiency is improved by 3-6 times, and the weight of the engine body is reduced by 3-6 times.

Description

Swing arm cam type two-stroke straight shaft internal combustion engine

Technical Field

The invention relates to a swing arm cam type two-stroke straight shaft internal combustion engine, which is a device that a piston connecting rod pushes an arc slide way on a swing arm to be matched with an elliptical cam on a straight shaft, so that the linear reciprocating motion of a piston is converted into the circular motion of the straight shaft.

Technical Field

The invention of the straight shaft internal combustion engine has been made for many years in folk, and the making process has various forms, but the straight shaft internal combustion engine has not been applied to the actual success case so far. The applicant filed a straight-shaft internal combustion engine with a frame tooth type in 2014, 12, 8, and the application numbers are as follows: 201410735070.1, the invention has been granted at present, this internal combustion engine can successfully start and operate by the mutual engagement of two tracks, but its greatest defect is that the direction of the arc point of the gear frame pushing the special-shaped gear upward is opposite when the connecting rod pushes the gear frame downward at the moment of fuel explosion, and once the contact point at the moment of fuel explosion generates resistance such as friction and clamping, the influence on the output efficiency is great. In view of the above-mentioned drawbacks, the applicant filed a 346 swing arm type two-stroke straight shaft internal combustion engine on 6/15/2018 with the following application numbers: 201810617299.3, the application is in the actual examination stage at present, this internal combustion engine overcomes the defect that the circular arc point of the gear frame of the frame-tooth straight-shaft internal combustion engine pushes the special-shaped teeth to run reversely, and the efficiency is also greatly improved, the number of the intermittent connection points is reduced from 5 to 3, but it still uses the running mode that two tracks are mutually connected, the manufacturing process of the machine is reduced a lot compared with the crankshaft internal combustion engine, but compared with the mode that two tracks of the frame-tooth straight-shaft internal combustion engine are mutually connected to run, the manufacturing process of the core component is reduced a little, and the running stability of the machine is also deficient.

Disclosure of the invention

The invention is a further improvement aiming at the defects of a 346 swing arm type two-stroke straight shaft internal combustion engine, and the improvement part is as follows: an elliptical cam on a straight shaft, see 2-3 in fig. 2, and a single arc-shaped slideway swing arm, see 2-1 in fig. 2, are matched to replace the complex operation mode of mutual connection and matching of the two rails, the force arm (namely, the arc vertex to the axle center distance) of the elliptical cam is further lengthened, the arc sliding section of the explosion stroke of the elliptical cam is designed according to the operation track and the rotation angle of the left arc-shaped slideway of the duck bill theory of the 346 straight shaft internal combustion engine, and the arc sliding section of the compression stroke of the elliptical cam still uses the compression arc-shaped slideway of the comma-shaped cam of the 346 straight shaft internal combustion engine, so the force arm of the elliptical cam is lengthened, but the operation parameters of the 346 straight shaft internal combustion engine are basically maintained in the explosion and compression strokes, the compression force for pushing the piston to rise in the compression stroke is also increased slightly, and the mechanical efficiency is further improved.

On the basis of a 346 swing arm type two-stroke straight shaft internal combustion engine, a single cylinder type in a unit series is shown in figure 2, a V-shaped 2-cylinder type is shown in figure 10, and a triangular 3-cylinder vertical type is shown in figure 11, a triangular 3-cylinder horizontal placement type is shown in figure 14, and the 4 types are improved by matching a single-track cam on a straight shaft with an arc-shaped sliding block on a swing arm. Meanwhile, the two units of the two-unit series, namely a V-shaped 4-cylinder model, a triangle vertically-arranged 6-cylinder model, a horizontally-arranged model and a triangle 15 are respectively improved by matching a single-track swing arm and an elliptical cam, wherein the model is shown in figure 13, and the model is shown in figure 15. In addition to the improvement, other parts of the machine still use parts in 346 swing arm type two-stroke straight shaft internal combustion engine.

The technical problem solved by the invention is as follows: a cam on the straight shaft is matched with a single-track arc-shaped slideway on the swing arm, namely a complex operation mode that double tracks of a 346 swing arm type two-stroke straight shaft internal combustion engine are mutually connected and matched is replaced, the manufacturing process of the core part of the machine is greatly simplified, the manufacturing method is simpler and more convenient, the manufacturing cost is further greatly reduced, the machine continuously operates in contact in one rotation, the operation stability of the machine is improved, and the operation noise is completely eliminated.

The invention changes an elliptic cam on a straight shaft to be matched with an arc-shaped sliding block on a swing arm, compared with a double-track running mode of a 346 swing arm type two-stroke straight shaft internal combustion engine, the invention has a part of changes, and introduces the performances of the elliptic cam type straight shaft and the single-slideway swing arm and the running condition in one rotation of the elliptic cam type straight shaft and the single-slideway swing arm in the invention by taking a single-cylinder one-unit type in the attached drawings of the application as a basis and taking explosion, exhaust, air blowing and compression as sequences. The 2-cylinder model in a unit series of the present invention, see fig. 10, the triangular 3-cylinder vertical model, fig. 11, the horizontal model, fig. 14, and a V-shaped 4-cylinder model in a two-unit series, see fig. 12, a triangular vertical placement 6-cylinder model, fig. 13 shows a horizontal placement type internal combustion engine, fig. 15 shows a mode that a duckbill wheel and comma-shaped cam combination on a straight shaft of the 346 internal combustion engine is replaced by an elliptical cam, a swing arm and side wall slide block combination is replaced by a single arc-shaped slide rail type swing arm, the mutual connection and matching operation of double rails of the 346 internal combustion engine is changed into a single-rail matching operation mode of the internal combustion engine, the mutual connection and matching operation principles of the double rails of the 346 internal combustion engine are completely the same, the specific operation process of the 2-cylinder or more type is described in detail in the 346 swing arm type two-stroke straight shaft internal combustion engine and can be used as a reference, and the invention is not illustrated in detail.

The invention is shown in figure 2

An explosion stage: the piston is connected with a connecting hole at the upper end of the swing arm through a connecting rod to push the swing arm, the arc vertex of the elliptic cam on the straight shaft is positioned at the 45-degree angle position on the right side of the vertical center line of the straight shaft at the moment, see 5-1 in figure 5, and the left half arc sliding section at the arc vertex of the elliptic cam is composed of 3-1, 3-2 and 3-3 in figure 3 and is designed according to the left half arc sliding track at the arc vertex of the duckbill wheel of the 346 swing arm type two-stroke straight shaft internal combustion engine, so the operation parameters in the explosion stroke are basically the same as those of the 346 swing arm type internal combustion engine, the 25-degree included angle between the arc top outgoing line of the elliptic cam and the left horizontal line is unchanged, the arc sliding section is shown as 3-1 in figure 3, after fuel oil is exploded, the piston pushes the connecting rod and the swing arm, so that the lower arc point at the front end of the swing arm pushes the elliptic cam to rotate towards the lower right side, when the piston descends to 10 mm from the top dead center, the lower arc point of the front end of the swing arm reaches the rear half part of the 5-2 and 25 degree angle sliding section in figure 5, when the piston descends to 20 mm from the top dead center, the lower arc point of the front end of the swing arm reaches the arc point of the inflection point of the elliptical cam, see 6-1 in figure 6, the small sliding section at the inflection point has the effect that the thrust direction of the lower arc point of the swing arm is approximately 90 degrees on the sliding section surface to increase the output efficiency, the small sliding section at the inflection point is shown as 3-2 in figure 3, when the piston descends to 50 mm from the top dead center, the arc section behind the lower arc point of the front end of the swing arm contacts the arc section behind the inflection point of the elliptical cam, see 6-2 in figure 6, and the 3-3 sliding section in figure 3 is the transition sliding section between the stage when the piston runs to the side wall of the exhaust hole of the cylinder and the side wall of the downward dead center, and when the piston descends to below 50 mm, the upper piston ring on the piston descends below the upper edge of the exhaust hole on the side wall of the cylinder, the cylinder enters an exhaust stage, and when the piston descends to 50 mm from the top dead center in the whole explosion stroke, the straight shaft rotates by about 124 degrees.

And (3) exhausting and blowing stages: the piston in the explosion stroke pushes the swing arm to move downwards, when the piston descends to 50 mm from the top dead center, the upper piston ring of the piston is positioned at the upper edge of the exhaust hole on the side wall of the lower part of the cylinder, see 8-1 in fig. 8, the exhaust gas in the cylinder begins to be discharged outwards through the exhaust hole on the side wall of the cylinder, when the piston descends to the position of the exhaust hole by half, the inlet cam on the straight shaft opens the inlet valve through the exhaust system, the compressed air blown out by the high-pressure fan enters the cylinder through the inlet channel on the cylinder cover and is ventilated outwards through the exhaust hole on the lower side of the cylinder, and the technical scheme of the 346 internal combustion engine is still used in the part. At the moment, the inertia wheel drives the elliptical cam on the straight shaft to rotate, the arc sliding section behind the inflection point of the elliptical cam is in contact with the arc sliding operation behind the arc point under the swing arm, see 6-2 in figure 6, the elliptical cam continues to rotate, the arc sliding section of the swing arm runs onto the circular sliding section of the elliptical cam, see 7-1 in figure 7, the piston runs to the bottom dead center, and the piston descends by 60 mm in the whole descending process.

When the partial sliding section behind the inflection point of the elliptical cam and the arc-shaped sliding way behind the lower arc point of the swing arm are matched to run, a process of gradually reducing the vertical descending speed is provided, and unstable running of a machine caused by sudden stop when the swing arm descends to a lower dead point at a high speed is avoided. Then the elliptical cam on the straight shaft rotates 30-40 degrees on the circular sliding section, the swing arm arc-shaped sliding block always runs on the circular track of the elliptical cam, the piston is stabilized at a bottom dead center, the exhaust valve is always in an open state, and air intake and air exchange are continuously carried out until the piston starts to run upwards. At this time, the rising arc section part of the elliptical cam starts to push the arc slide way of the swing arm to enable the swing arm to rise, see 7-2 in fig. 7, when a next piston ring on the piston rises to the upper side of an exhaust hole on the side wall of the cylinder, the intake valve is closed, the cylinder enters a compression stroke, and the straight shaft rotates by about 118 degrees in the whole exhaust and gas exchange process.

A compression stage: the arc-shaped slideway of the swing arm continues to rise under the pushing of the arc-shaped sliding section of the compression section of the elliptical cam, and the arc-shaped sliding section of the compression section of the elliptical cam rises to the top dead center under the driving of the inertia wheel, as shown in 3-8 in figure 3, the arc-shaped slideway of the comma type cam of the 346 swing arm type internal combustion engine is still used, and various operating parameters of the arc-shaped slideway are the same as those of the 346 swing arm type internal combustion engine. The useless component force in the compression stage and the useless component force in the explosion stage have opposite effects, the support effect of the useless component force can reduce the loss of the useful component force, the upper half part of the compression sliding section of the elliptic cam in the compression stage of the machine runs at an angle with small deviation degree on the left side and the right side of the connecting line of the central point of the shaft pin connecting hole at the upper part of the swing arm and the central point of the elliptic cam shaft, see figure 9, wherein 9-1 in figure 9 is the deviation angle of the connecting line of the two central points and the contact point when the piston rises to 20 mm away from the top dead center, the deviation degree can be seen to be very small, particularly when the piston approaches the top dead center, the arc top point of the elliptic cam runs at an angle of 45 degrees on the right side of the vertical line of the shaft center, the reverse thrust of the piston to the swing arm and the elliptic cam is consistent with the running direction of the output shaft, the reverse thrust is small enough to be ignored, and is equivalent to the self-locking principle that the jack can only rotate in one direction and can not reverse, fig. 9-2 shows the deviation of piston when it rises to 6 mm from top dead center, but the useless component supporting effect of crank is much less in the compression stage of crankshaft internal combustion engine, and the force pushing piston to rise has a large part to resist the reverse thrust of crankshaft, and this machine can save a part of energy loss, so that the force arm of machine is lengthened, but the rotating force pushing piston to rise is not increased much.

The fuel oil explosive force at the ignition advance angle stage of the crankshaft internal combustion engine is negative work, the reverse thrust is negligibly small at the ignition advance angle stage of the engine except for the above mentioned useless component force supporting effect, and the arc section which is a few millimeters and is vertical to the axis is formed at the arc vertex of the elliptic cam, as shown in 3-6 in the figure 3, so that the phenomenon that the fuel oil explosive force at the ignition advance angle stage is negative work is further avoided, a stable explosive environment is provided for fuel oil explosion, and the efficiency of the engine is further improved compared with that of the crankshaft internal combustion engine.

The invention has the following beneficial effects:

a single slideway cam on the straight shaft is matched with a single arc slideway on the swing arm, namely a complex operation mode that double tracks of a 346 swing arm type two-stroke straight shaft internal combustion engine are mutually connected and matched is replaced, the manufacturing process of the core part of the machine is greatly simplified, the manufacturing procedure is simpler and more convenient, the manufacturing cost is further greatly reduced, the machine is in continuous contact operation in one rotation, the operation stability of the machine is increased, the operation noise is completely eliminated, the force arm of the elliptic cam is further lengthened, the efficiency of the machine is improved by 3-6 times of that of a crankshaft internal combustion engine with the same volume, and the machine body is lightened by 3-6 times.

Drawings

FIG. 1 is a schematic diagram showing the structure of a 346 swing arm type two-stroke straight shaft internal combustion engine 1 unit 1 cylinder, wherein "1-1 is a swing arm side wall slide block complex, 1-2 is a duckbill wheel comma type cam complex"

FIG. 2 is a schematic diagram of the structure of a unit 1 cylinder of a swing arm cam type two-stroke straight shaft internal combustion engine 1 of the present invention, wherein "2-1 is a single-slideway swing arm," 2-2 is that the lower arc point of the swing arm is contacted with the arc vertex of an elliptical cam, "2-3 is an elliptical cam on the straight shaft"

FIG. 3 is a schematic view of the configuration of the elliptical cam shape and the arc lengths of three slides, wherein "3-1, 3-2, 3-3" constitutes an explosion stroke slide, 3-5 are exhaust and blowing arc slides, and 3-8 are compression stroke arc slides "

FIG. 4 is a schematic structural view of a single-slideway swing arm, wherein "4-1 is a connecting hole at the rear end of the swing arm installed on a case, 4-2 is a swing arm single-track arc slideway, (4-3) is a piston pin hole at the upper part of the front end of the swing arm, and (4-4) is an arc point at the lower part of the front end of the swing arm"

FIG. 5 is a schematic diagram showing the swing arm lower arc point contacting the arc apex of the elliptical cam and the right side contacting the rear half of the arc sliding section with an angle of 25 degrees when the piston descends by 10 mm, wherein "5-1 is the piston at the top dead center, 5-2 is the piston descending by 10 mm, and the swing arm lower arc point contacting the rear half of the arc sliding section with an angle of 25 degrees"

FIG. 6 is a schematic diagram showing that when the piston descends to a distance of 20 mm from the top dead center, the lower arc point at the front end of the swing arm reaches the arc sliding section of the inflection point of the elliptical cam, and when the piston descends to a distance of 50 mm from the top dead center, the arc sliding section behind the lower arc point of the swing arm contacts the arc section behind the inflection point of the elliptical cam, where "6-1 is that the arc point at the front end of the swing arm contacts the arc of the inflection point of the elliptical cam," 6-2 is that the arc sliding section behind the lower arc point of the swing arm contacts the arc sliding section behind the inflection point of the elliptical cam, "the piston is positioned at the front end of the swing arm, and" the piston is positioned at the front end of the swing arm and the arc sliding section behind the lower arc point of the swing arm contacts the arc sliding section behind the inflection point of the elliptical cam "

FIG. 7 shows the left side where the arc-shaped sliding section of the swing arm moves to the bottom dead center arc-shaped sliding section of the elliptical cam, and the right side where the rising arc-shaped sliding section of the elliptical cam starts to push the arc-shaped sliding way of the swing arm to make the swing arm rise, where "7-1" is where the arc-shaped sliding section of the swing arm moves to the bottom dead center arc-shaped sliding section of the elliptical cam, and "7-2" is where the rising arc-shaped sliding section of the elliptical cam starts to push the arc-shaped sliding way of the swing arm to make the swing arm rise, ".

FIG. 8 is a schematic view showing the structure of the whole machine when the piston is lowered to 50 mm from the top dead center and the upper piston ring of the piston is located at the upper edge of the exhaust hole on the lower side wall of the cylinder, wherein "8-1" is the upper piston ring located at the upper edge of the exhaust hole on the lower side wall of the cylinder "

FIG. 9 is a schematic diagram showing the left side of the graph showing the line connecting the two center points and the contact points when the piston rises to a distance of 20 mm from the top dead center, and the right side showing the deviation angle of the line connecting the two center points and the contact points when the piston rises to a distance of 6 mm from the top dead center, in which "9-1 is the contact point between the two center points and the swing arm elliptical cam when the piston rises to a distance of 20 mm from the top dead center," 9-2 is the contact point between the two center points and the swing arm elliptical cam when the piston rises to a distance of 6 mm from the top dead center, ".

FIG. 10 is a schematic view of a 2-cylinder V-type machine, wherein "10-1 is the arc point of the lower swing arm of 1 cylinder at the arc vertex of the elliptical cam, and 10-2 is the arc sliding section of the swing arm of 2 cylinders pushed by the elliptical cam to make the piston rise to the upper edge of the exhaust hole at the lower part of the cylinder"

FIG. 11 is a schematic view of a unit 3-cylinder triangle vertically placed model, wherein "11-1 is that the lower arc point of the swing arm of 1 cylinder is at the arc vertex of the elliptical cam, 11-2 is that the elliptical cam contacts the arc sliding section of the swing arm of 2 cylinders, so that the piston rises to the upper edge of the exhaust hole at the lower part of the cylinder, 11-3 is that the lower part of the small arc section of the inflection point of the elliptical cam contacts the lower arc point of the swing arm of 3 cylinders, so that the piston falls to the upper edge of the exhaust hole at the lower part of the cylinder, and the upper edge of the exhaust hole at the upper part of the cylinder is contacted with the lower arc point of the swing arm,"'

FIG. 12 is a schematic view of a two-unit 4-cylinder V-type machine, wherein "12-1 is a left bearing," 12-2 is a distance from a right side of the left bearing to a left side of an elliptical cam, "12-3 is a distance from the right side of the elliptical cam to the left side of an intake cam," 12-4 is a straight-axis dotted line schematic view, 12-6 is the intake cam, "12-5 is a distance from the right side of the intake cam to the left side of the right elliptical cam," 12-7 is a distance from the right side of the elliptical cam to the left side of the right bearing, "12-8 is the right bearing," 12-6 is a right bearing "

FIG. 13 is a schematic view of a two-unit 6-cylinder triangle vertical placement machine type in which "13-1 is a first swing arm of a left-side unit, 13-2 is a second swing arm of the left-side unit, 13-3 is a third unit swing arm of the left-side unit, the position of an elliptic cam swing arm of the right-side unit and the position of the left-side unit are completely symmetrical"

FIG. 14 is a schematic view of a three-cylinder triangular horizontal placement machine type, wherein 14-1 is an air inlet and oil supply cam, 14-2 is an elliptical cam and 3 horizontally placed swing arms matched structure "

FIG. 15 is a schematic view of a two-unit 6-cylinder triangular horizontal placement machine, wherein "15-1 is a schematic view of an upper-layer unit structure, 15-2 is an intake cam, and 15-3 is a bottom-layer unit structure. "

First embodiment of swing arm cam type two-stroke straight shaft internal combustion engine

The embodiment is a single-cylinder one-unit internal combustion engine, the specific structure is shown in figure 2, a matching unit is formed by a single-track swing arm and an elliptical cam, the lower arc point at the front end of the single-track swing arm is shown in figure 2-2, the back is provided with an arc slideway, shown in figure 2-1, the upper part at the front end of the swing arm is provided with a piston pin hole, shown in figure 4-3, the middle part is provided with a compression spring, the back end of the swing arm is provided with a hole connected with a case, shown in figure 4-1, the lower part at the front end of the swing arm is provided with an arc slideway, shown in figure 4-2, the arc slideway is rotatably matched with the elliptical cam on a straight shaft, shown in figure 2-3, so that a piston in a cylinder reciprocates up and down, the length from the axle center of the elliptical cam to the arc vertex is further lengthened compared with the length from the arc vertex to the axle center of a duckbill wheel of a 346 swing arm type internal combustion engine, the elliptical cam is divided into arc slideways with explosion strokes, see 3-4 in fig. 3, an arc-shaped slide way at an exhaust and blowing stage, 3-5 in fig. 3, an arc-shaped slide way at a compression stage, 3-8 in fig. 3, an arc-shaped slide way at an explosion stroke is further divided into a slide section with an angle of 25 degrees, 3-1 in fig. 3, a small arc-shaped slide section with a small inflection point, 3-2 in fig. 3, and an arc-shaped slide section with an exhaust valve opened and transited to a bottom dead center, 3-3 in fig. 3, a small arc section with an arc vertex vertical to an axis is arranged at the arc vertex of an elliptic cam, see 3-6 in fig. 3, an intake cam and an injection valve cam are further arranged on a straight shaft and matched with an intake swing sheet and an oil supply pump, and the mechanisms and the working principle are consistent with those of a 346 swing arm type two-stroke straight shaft internal combustion engine and are not specifically described.

The technical scheme of the embodiment is as follows, the length from the axle center point of the elliptic cam to the arc vertex of the cam is 48.5 mm, the length from the axle center point to the arc vertex of the bottom dead center is 16 mm, the explosion stroke is 25 degrees of sliding section, 3-1 in figure 3, the arc length is 38 mm, the chord height is 7 mm, the arc length of the arc slideway in the compression stage is 56 mm, the chord height is 13 mm, the length of the small arc sliding section at the inflection point is 6 mm, the thickness of the elliptic cam is 20 mm, the rotation angle of the straight axle in the explosion stroke is 124 degrees, the rotation angle in the exhaust and blowing stage is 118 degrees, and the rotation angle in the compression stage is 118 degrees,

the length from the piston pin hole at the upper part of the front end of the single-track swing arm to the lower arc point is 65 mm, the length from the piston pin hole to the connecting hole of the compression spring is 60 mm, the length from the piston pin hole to the connecting hole at the rear end of the swing arm is 175 mm, the arc length of the arc sliding section of the swing arm is 55 mm, the chord height is 8 mm, the thickness of the arc sliding section of the swing arm is 20 mm,

second embodiment of swing arm cam type two-stroke straight shaft internal combustion engine

The embodiment is a series of unit models, including a single cylinder model, see figure 2, a V-shaped 2-cylinder model, see figure 10, and a triangular 3-cylinder vertical model, see figure 11, a triangular 3-cylinder horizontal model, see figure 14, a V-shaped 2-cylinder model and a triangular 3-cylinder vertical model, the distance between an elliptic cam and an air inlet oil supply cam and then the inner sides of two cases is consistent with that of a single cylinder model, see figure 2, the straight shaft in figure 14 is vertically arranged, the distance between the elliptic cam and the air inlet oil supply cam and then the two inner side walls of the cases is also consistent with that of one unit of other models, and the 4 models are improved by matching an elliptic cam on the straight shaft with an arc-shaped slideway on the swing arm on the basis of a 346 swing arm type two-stroke straight shaft internal combustion engine unit,

the technical scheme of the embodiment is that the swing arm and the elliptical cam are suitable for a series of unit models, the technical scheme of the embodiment 1 is used for the swing arm and the elliptical cam, the diameter of the straight-shaft elliptical cam is 25 mm, the distance from the inner wall of the right side of the case to the left side of the oil supply air inlet cam is 25 mm, the total width of the two cams for oil supply and air inlet is 25 mm, the distance from the left side of the air inlet cam to the elliptical cam is 25 mm, the thickness of the elliptical cam is 20 mm, the distance from the left side of the elliptical cam to the right inner wall of the case is 25 mm, the thickness of the left wall and the right wall of the case is 15 mm, and the axial width of the two outer walls of the case is 150 mm.

Third embodiment of swing arm cam type two-stroke straight shaft internal combustion engine

The embodiment is a two-unit series model, comprising a V-shaped 4-cylinder model, see fig. 12, and a triangular 6-cylinder vertical model, see fig. 13, a triangular 6-cylinder horizontal model, see fig. 15, wherein the 3 models are also improved by matching an elliptical cam on a straight shaft with a single arc-shaped slideway on a swing arm on the basis of a 346 swing arm type two-stroke straight-shaft internal combustion engine two-unit.

The following is a technical scheme of a third embodiment, which is suitable for two-unit series models, the distances from two elliptic cams of the three models to an air inlet cam and then to two inner side walls of a case are consistent, the swing arm and the elliptic cam of the scheme use the technical scheme in the embodiment 1, the diameter of the straight-shaft elliptic cam is 30 mm, the diameter of the right-shaft elliptic cam is 25 mm, the width of the elliptic cam is 20 mm, the width of the elliptic cam is 25 mm, the width of the air inlet cam is 25 mm, the width of the elliptic cam is 20 mm, the width of the elliptic cam is 25 mm, the thickness of two walls of the case is 15 mm, and the axial width of two outer walls of the case is 195 mm.

Claims

1. The utility model provides a swing arm cam-type two-stroke straight axle internal-combustion engine, includes cam-type straight axle, swing arm, there is the piston pin connecting hole swing arm front end upper portion, and the piston pin connecting hole passes through connecting rod and piston connection, and the lower circular arc point and the arc slide of swing arm front end cooperate with the epaxial cam of straight, make piston straight reciprocating motion convert the circular motion of straight axle, its characterized in that: a single-track elliptical cam on the straight shaft is matched with a single-track arc-shaped slideway on the swing arm to finish the reciprocating motion of a piston of the internal combustion engine to be changed into 360-degree circular motion of the straight shaft, and meanwhile, the internal combustion engine is of a unit series type or a unit series type, wherein the unit series type comprises a unit single-cylinder type, a unit 2-cylinder V-type, a unit 3-cylinder triangular vertical placing type and a unit 3-cylinder triangular horizontal placing type; a swing arm (2-1) of a single-unit single-cylinder type is matched with an elliptical cam (2-3); a swing arm I and a swing arm II in a unit 2-cylinder V-shaped machine type are matched with an elliptical cam; a swing arm I, a swing arm II and a swing arm III in a unit 3 cylinder triangle vertical placing machine type are matched with an elliptic cam; the one-unit 3-cylinder triangular horizontal placement machine type is provided with an air inlet oil supply cam (14-1), an elliptical cam and 3 horizontally placed swing arms, wherein the elliptical cam is matched with the 3 horizontally placed swing arms; the two-unit series machine type comprises a two-unit V-shaped 4-cylinder machine type, a two-unit triangular 6-cylinder vertical placing machine type, a two-unit triangular 6-cylinder horizontal placing machine type, a left side unit swing arm of the two-unit V-shaped 4-cylinder machine type is matched with an elliptical cam, and a right side unit swing arm of the two-unit V-shaped 4-cylinder machine type is matched with the elliptical cam; the left unit swing arm and the right unit swing arm of the two-unit triangular 6-cylinder vertical placement machine are matched with the elliptical cam, wherein the right side and the left side are symmetrical; the two-unit triangular 6-cylinder horizontal placing machine type upper-layer unit swing arm is matched with the elliptical cam, and the air inlet cam (15-2) and the lower-layer unit swing arm are also matched with the elliptical cam.

2. The swing arm cam type two-stroke straight shaft internal combustion engine according to claim 1, characterized in that: the length from the axle center point of the elliptic cam to the arc vertex is further lengthened compared with the length from the axle center point of a duckbilled axle of a swing arm type two-stroke straight-axle internal combustion engine to the arc vertex, the elliptic cam on the straight axle is divided into an explosion stroke arc slide way (3-4), an exhaust blowing stage arc slide way (3-5) and a compression stage arc slide way (3-8), the explosion stroke arc slide way is divided into a 25-degree angle slide way (3-1), an inflection point small arc slide way (3-2) and an exhaust valve opening and transition to a bottom dead center arc slide way (3-3).

3. The swing arm cam type two-stroke straight shaft internal combustion engine according to claim 2, characterized in that: the length from the shaft center point of the elliptic cam to the arc vertex of the cam is 48.5 mm, the length from the shaft center point to the arc vertex of the bottom dead center is 16 mm, the arc length of a sliding section (3-1) with an angle of 25 degrees of an explosion stroke is 38 mm, the chord height is 7 mm, the arc length of an arc slide way in a compression stage is 56 mm, the chord height is 13 mm, the length of a small arc sliding section is 6 mm, the thickness of the elliptic cam is 20 mm, the rotation angle of the explosion stroke is 124 degrees, the rotation angle of an exhaust and blowing stage is 118 degrees, and the rotation angle of the compression stage is 118 degrees.

4. The swing arm cam type two-stroke straight shaft internal combustion engine according to claim 1, characterized in that: the upper part of the front end of the swing arm is provided with a piston pin hole (4-3), the middle part of the top end of the swing arm is provided with a compression spring, the rear end of the swing arm is provided with a connecting hole (4-1) arranged on the case, and the lower part of the front end of the swing arm is provided with a single-track arc-shaped slideway (4-2).

5. The swing arm cam type two-stroke straight shaft internal combustion engine according to claim 4, wherein: the length from the central point of a piston pin hole (4-3) at the upper part of the front end of the swing arm to a lower arc point (4-4) is 65 mm, the length from the central point of the piston pin hole to the central point of a connecting hole of the compression spring is 60 mm, the length from the central point of the piston pin hole to the central point of a connecting hole at the rear end of the swing arm is 175 mm, the arc length of an arc sliding section of the swing arm is 55 mm, the chord height is 8 mm, and the thickness of the arc sliding section of the swing arm is 20 mm.

6. The swing arm cam type two-stroke straight shaft internal combustion engine according to claim 1, characterized in that: the elliptical cams in the unit series models and the unit series models are all elliptical cams as claimed in claim 2, and the swing arms in the unit series models and the unit series models are all swing arms as claimed in claim 4.

7. The swing arm cam type two-stroke straight shaft internal combustion engine according to claim 1, characterized in that: the distances from the elliptic cam to the air inlet and air supply cam and then to the inner sides of the two machine boxes in the 4 machine types of the unit series are consistent, the distance from the inner wall of the right side of the machine box to the left side of the oil supply and air inlet cam is 25 mm, the width of the two cams for oil supply and air inlet is 25 mm, the distance from the left side of the air inlet cam to the elliptic cam is 25 mm, the thickness of the elliptic cam is 20 mm, the distance from the left side of the elliptic cam to the right inner wall of the machine box is 25 mm, the axial width of the two outer walls of the machine box is 150 mm, and the diameter of the elliptic cam is 25 mm.

8. The swing arm cam type two-stroke straight shaft internal combustion engine according to claim 1, characterized in that: distances from oval cams on the left side and the right side to air inlet cams and then to the inner sides of two machine boxes in 3 machine types of the two unit series are consistent, the distance from the left inner wall on the right side of the machine box to the right side of the right oval cam is 25 mm, the width of the right oval cam is 20 mm, the distance from the left side of the oval cam to the air inlet cam is 25 mm, the width of the air inlet cam is 25 mm, the distance from the left side of the air inlet cam to the right side of the left oval cam is 25 mm, the width of the left oval cam is 20 mm, the distance from the left side of the oval cam to the right inner wall of the machine box is 25 mm, the thickness of two walls of the machine box is 15 mm, the axial width of two outer walls of the machine box is 195 mm, and the diameter of the straight-axis oval cam is 30 mm.