CN111706443A

CN111706443A - Crankcase assembly and two-stroke engine

Info

Publication number: CN111706443A
Application number: CN202010588613.7A
Authority: CN
Inventors: 王振
Original assignee: Modern Auto Co Ltd
Current assignee: Modern Auto Co Ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2020-09-25
Anticipated expiration: 2040-06-24
Also published as: CN111706443B

Abstract

The invention discloses a crankcase assembly and a two-stroke engine, wherein the crankcase assembly comprises a first crankshaft, a second crankshaft and a reversing mechanism connected between the first crankshaft and the second crankshaft, the reversing mechanism can enable the first crankshaft and the second crankshaft to rotate in different directions, the crankcase assembly adopting the structure can enable a piston connected with the first crankshaft and a piston connected with the second crankshaft to move in opposite directions, under the condition, the pistons in cylinder bodies on two sides collide with the inner wall surface of the cylinder bodies at different positions, vibration generated by the first crankshaft and the second crankshaft due to centrifugal action can be partially offset, and second-order vibration of the engine can be reduced due to the adoption of a cross crankshaft. The two-stroke engine adopts the crankcase assembly with the structure, so that the vibration of the two-stroke engine can be further reduced.

Description

Crankcase assembly and two-stroke engine

Technical Field

The invention relates to the field of engines, in particular to a crankcase assembly and a two-stroke engine.

Background

The engine is the most important technology for the development of the field of power devices, most of crankcase assemblies in the existing engines only have one crankshaft, and the rotating direction is unchanged. And along with the climbing of rotational speed, its vibration is more obvious, and vibration amplitude is also bigger, for reducing engine vibration, general engine need install alone balanced axle additional and offset self second order vibration, and the balanced axle of additional installation can occupy the installation space of engine to need calculate the quality, the mounted position etc. of balanced axle, can make the engine installation inconvenient and increase the design degree of difficulty of balanced axle.

Therefore, the crankcase assembly of the engine in the prior art has the problems of complex structure and large processing difficulty.

Disclosure of Invention

The invention aims to solve the problems of complex structure and high processing difficulty of a crankcase assembly of an engine in the prior art. The crankcase assembly and the two-stroke engine have the advantages of simple structure and small processing difficulty.

In order to solve the above problems, an embodiment of the present invention provides a crankcase assembly, including a case and a crankshaft transmission mechanism, where the crankshaft transmission mechanism is disposed in the case; the crankshaft transmission mechanism includes:

a first crankshaft and a second crankshaft, the first crankshaft and the second crankshaft each having a proximal end and a distal end disposed in opposition, the proximal end of the first crankshaft and the proximal end of the second crankshaft being spaced end-to-end, and an axis of the first crankshaft and an axis of the second crankshaft being collinear;

a reversing mechanism including a first power connection and a second power connection; the one end of first power connecting portion with the near-end transmission of first bent axle is connected, the other end of first power connecting portion with the one end transmission of second power connecting portion is connected, the other end of second power connecting portion with the near-end transmission of second bent axle is connected, first power connecting portion with second power connecting portion are opposite direction and rotate, so that first bent axle with the second bent axle rotates towards opposite direction.

By adopting the above technical scheme, the crankcase assembly in this embodiment includes the first crankshaft and the second crankshaft, and is connected to the reversing mechanism between the first crankshaft and the second crankshaft, and the reversing mechanism can make the first crankshaft and the second crankshaft rotate in different directions, and the crankcase assembly adopting such a structure can make the piston connected with the first crankshaft and the piston connected with the second crankshaft move in opposite directions, and in this case, the pistons in the cylinders on both sides collide with the inner wall surface of the cylinder at different positions, for example, when the piston in the cylinder on the left side collides with the top dead center of the cylinder, the piston in the cylinder on the right side collides with the bottom dead center of the cylinder, and the collisions in the two directions can be partially cancelled out, so that the first-order vibration can be reduced.

In addition, because the first crankshaft and the second crankshaft rotate in different directions, the main shaft diameter and the connecting rod diameter on the first crankshaft and the second crankshaft also rotate in different directions, so that vibration generated by the first crankshaft and the second crankshaft due to centrifugal action is partially counteracted mutually, and further the second-order vibration of the engine can be reduced. Therefore, the crankcase assembly of the present embodiment can reduce the first order vibration and the second order vibration with the simple structure, and does not need to add an additional member such as a balance shaft, and further does not need to calculate the mass, the mounting position, and the like of the balance shaft. Therefore, the structure in the embodiment occupies a smaller space, has a simpler structure and is less difficult to process.

Further, another embodiment of the present invention provides a crankcase assembly, wherein the first power connecting portion includes a first gear ring, a first gearwheel and a first pinion, and the second power connecting portion includes a second gear ring, a second gearwheel and a second pinion; wherein the content of the first and second substances,

the first gear ring is meshed with the first gearwheel, the first gearwheel is coaxial with the first pinion, the second gear ring is meshed with the second gearwheel, the second gearwheel is coaxial with the second pinion, and the first pinion is meshed with the second pinion; and the number of the first and second electrodes,

the near end of the first crankshaft is fixedly connected with the outer wall surface of the first gear ring, and the near end of the second crankshaft is fixedly connected with the outer wall surface of the second gear ring.

By adopting the technical scheme, the reversing mechanism in the embodiment is set to be in the structure, the reversing of the two crankshafts can be realized through the simple gear set, the structure is simple, and the size of the crankcase can be further reduced.

Further, another embodiment of the present invention provides a crankcase assembly, wherein the first power connection portion and the second power connection portion are centrosymmetric.

Adopt above-mentioned technical scheme, first power connecting portion and second power connecting portion are central symmetry, can make reverse rotation mechanism more steady at the during operation through the setting of this kind of structure, and then can make first bent axle and second bent axle more steady.

Further, another embodiment of the present invention provides a two-stroke engine including a plurality of cylinder blocks and a crankcase assembly of the above construction; wherein the content of the first and second substances,

among the plurality of cylinders, the number of cylinders on the left side is equal to that of cylinders on the right side; wherein the content of the first and second substances,

the first crankshaft is in transmission connection with the cylinder body located on the left side, and the second crankshaft is in transmission connection with the cylinder body located on the right side.

By adopting the technical scheme, because the two-stroke engine in the embodiment adopts the crankcase assembly with the structure, and because the crankcase assembly with the structure comprises the first crankshaft and the second crankshaft, and the reversing mechanism is connected between the first crankshaft and the second crankshaft, the reversing mechanism can enable the first crankshaft and the second crankshaft to rotate towards different directions, and by adopting the crankcase assembly with the structure, the piston connected with the first crankshaft and the piston connected with the second crankshaft can move towards opposite directions. Therefore, the crankcase assembly of the two-stroke engine according to the present embodiment, which employs this structure, can further reduce vibrations.

Further, another embodiment of the present invention provides a two-stroke engine comprising 4 said cylinders, each of said cylinders having at least 4 intake ports and at least 2 exhaust ports; an air inlet valve mechanism is arranged at the air inlet, and an exhaust valve mechanism is arranged at the exhaust port; wherein the content of the first and second substances,

and when the piston in each cylinder body is close to the bottom dead center of the cylinder body, the air inlet valve mechanism and the air outlet valve mechanism are both opened.

By adopting the technical scheme, the exhaust port of the cylinder body can be more conveniently controlled by the arrangement of the exhaust valve mechanism, so that the gas in the cylinder body can be more fully combusted to do work on the piston in the working process of the cylinder body. The arrangement of the air inlet valve mechanism can enable a cylinder body in the two-stroke engine to timely enter air through the air inlet, so that pure air scavenging can be realized for the cylinder body, and the exhaust efficiency is improved. Therefore, the combustion work efficiency of the cylinder can be further improved by the arrangement of the structure.

Further, another embodiment of the present invention provides a two-stroke engine, the intake valve mechanism including an intake valve and a first connecting rod; wherein the content of the first and second substances,

one end of the first connecting rod is in transmission connection with the intake valve, and the other end of the first connecting rod is in transmission connection with the first crankshaft or the second crankshaft.

Further, another embodiment of the invention provides a two-stroke engine, wherein the exhaust valve mechanism comprises a fixed block, an exhaust valve and a transmission assembly; wherein the content of the first and second substances,

the fixed block fixed connection in be close to on the outer wall of cylinder body the position of gas vent, the exhaust valve set up in gas vent department, drive assembly's one end with the exhaust valve transmission is connected, drive assembly's the other end with first bent axle or second bent axle transmission are connected, in order to drive the exhaust valve is kept away from or is close to the gas vent, and then makes the gas vent is opened or is closed.

By adopting the technical scheme, the transmission assembly can drive the exhaust valve to do translational motion, the opening or closing of the exhaust valve can be controlled through the simple structure, and the structure is simpler.

Further, another embodiment of the present invention provides a two-stroke engine, where a position of the cylinder block corresponding to each of the intake ports is provided with an intake passage, one end of the intake passage is communicated with the intake port, and the other end of the intake passage is communicated with an intake pipe, so as to introduce gas into the intake passage through the intake pipe; and the number of the first and second electrodes,

and the positions of the fixed blocks, which correspond to the exhaust ports, are provided with exhaust channels, one ends of the exhaust channels are communicated with the exhaust ports, and the other ends of the exhaust channels are communicated with an exhaust system of the automobile.

Further, another embodiment of the present invention provides a two-stroke engine, the transmission assembly including a second connecting rod, a return spring, a slide rod, a rotation connecting portion, and a grooved cam; wherein the content of the first and second substances,

one end of a second connecting rod is in transmission connection with the exhaust valve, and the other end of the second connecting rod is in rotatable connection with the sliding rod through the rotating connecting part; the reset spring is sleeved on the second connecting rod, and one end of the reset spring, which is far away from the sliding rod, is clamped with the outer wall surface of the second connecting rod; the length direction of the sliding rod is perpendicular to the length direction of the return spring, one end of the sliding rod, which is far away from the return spring, penetrates through and is connected with a groove in the groove cam in a sliding manner, the groove cam is rotationally connected to the fixed block through a rotating shaft, and the rotating shaft is in transmission connection with the first crankshaft or the second crankshaft; wherein the content of the first and second substances,

when the curve contour part of the groove cam is in contact with the slide rod, the groove cam pushes the slide rod to drive the second connecting rod to move towards the direction close to the exhaust port, so that the return spring is in a compressed state, and the second connecting rod is linked with the exhaust valve to be close to the exhaust port so as to close the exhaust port;

when the groove part of the groove cam is in contact with the sliding rod, the second connecting rod moves towards the direction away from the exhaust port by the elastic force generated by the return spring, and the second connecting rod is linked with the exhaust valve to be away from the exhaust port so as to open the exhaust port.

Adopt above-mentioned technical scheme, transmission assembly comprises second connecting rod, reset spring, slide bar, rotation connecting portion and recess cam, and under this condition, when needing to close the exhaust gate, can make the curve profile part of recess cam rotate to with the slide bar contact, just can make second connecting rod linkage exhaust valve be close to the gas vent to close the gas vent. When the exhaust valve needs to be opened, the groove part of the groove cam can be rotated to be in contact with the sliding rod, and the elastic force generated by the return spring can enable the second connecting rod to move towards the direction departing from the exhaust port so as to open the exhaust port.

In addition, if the opening time of the exhaust valve needs to be adjusted, the shape of the groove cam only needs to be redesigned. Therefore, the transmission assembly in the present embodiment is more conveniently designed.

Further, another embodiment of the present invention provides a two-stroke engine, wherein an angle between two adjacent main shaft diameters on the first crankshaft and two adjacent main shaft diameters on the second crankshaft is 90 °.

By adopting the technical scheme, the included angle between two adjacent main shaft diameters on the first crankshaft and the second crankshaft is 90 degrees, and due to the arrangement of the structure, the included angle between two adjacent main shaft diameters on the first crankshaft and the second crankshaft is smaller and is of a cross shaft structure, so that the second-order vibration of the engine can be further reduced.

Additional features and corresponding advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural view of a crankcase assembly provided in embodiment 1 of the invention;

fig. 2 is a schematic structural view of a reversing mechanism in a crankcase assembly according to embodiment 1 of the invention;

fig. 3 is a schematic sectional view in a front view of a two-stroke engine according to embodiment 2 of the present invention;

fig. 4 is a schematic cross-sectional view of a two-stroke engine according to embodiment 2 of the present invention in a side view.

Description of reference numerals:

10: a two-stroke engine;

110: a cylinder body; l: left side; r: the right side; d: a piston;

111: an air inlet;

1111: an intake valve mechanism;

11110: an intake valve; 11111: a first connecting rod; 111112: an air intake passage;

112: an exhaust port;

1121: an exhaust valve mechanism;

11210: a fixed block;

112110: an exhaust passage;

11211: an exhaust valve;

11212: a transmission assembly;

112121: a second connecting rod; 112122: a return spring; 112123: a slide bar;

112124: a rotation connecting part; 112125: a groove cam; 112126: a rotating shaft;

113: a connecting rod;

120: a crankcase assembly;

121: a box body;

122: a crankshaft drive mechanism;

1221: a first crankshaft; 1222: a second crankshaft; a: a proximal end; b: a distal end; c: the diameter of the main shaft;

1223: a reversing mechanism;

12231: a first power connection;

122310: a first ring gear; 122311: a first bull gear; 122312: a first pinion gear;

12232: a second power connection;

122320: a second ring gear; 122321: a second bull gear; 122322: a second pinion gear.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1:

as shown in fig. 1, the embodiment of the present embodiment provides a crankcase assembly 120, which includes a casing 121 and a crank mechanism 122, wherein the crank mechanism 122 is disposed in the casing 121; the crank drive 122 includes a first crankshaft 1221 and a second crankshaft 1222.

Specifically, in the present embodiment, the first crankshaft 1221 and the second crankshaft 1222 each have a proximal end a and a distal end B (in the structure shown in fig. 1) that are disposed opposite to each other, the proximal end a of the first crankshaft 1221 and the proximal end a of the second crankshaft 1222 are disposed end to end at a distance, and the axis of the first crankshaft 1221 and the axis of the second crankshaft 1222 are located on the same straight line.

Further, the crankcase assembly 120 further includes a reverse rotation mechanism 1223, and the reverse rotation mechanism 1223 includes a first power connection portion 12231 and a second power connection portion 12232; one end of the first power connection portion 12231 is in transmission connection with the proximal end a of the first crankshaft 1221, the other end of the first power connection portion 12231 is in transmission connection with one end of the second power connection portion 12232, the other end of the second power connection portion 12232 is in transmission connection with the proximal end a of the second crankshaft 1222, and the first power connection portion 12231 and the second power connection portion 12232 rotate in opposite directions, so that the first crankshaft 1221 and the second crankshaft 1222 rotate in opposite directions.

Specifically, in the present embodiment, since the crankcase assembly 120 includes the first crankshaft 1221 and the second crankshaft 1222, and the reversing mechanism 1223 connected between the first crankshaft 1221 and the second crankshaft 1222, the reversing mechanism 1223 can rotate the first crankshaft 1221 and the second crankshaft 1222 in different directions, and the crankcase assembly 120 having such a structure can move the piston D connected to the first crankshaft 1221 and the piston D connected to the second crankshaft 1222 in opposite directions, in this case, the pistons D in the cylinders 110 on both sides may collide with the inner wall surface of the cylinder 110 at different positions, for example, when the piston D in the left L cylinder 110 collides with the top dead center of the cylinder 110, the piston D in the right R cylinder 110 collides with the bottom dead center of the cylinder 110, and the collisions in both directions may partially cancel each other, so that the first-order vibration can be reduced.

More specifically, in the present embodiment, since the first crankshaft 1221 and the second crankshaft 1222 rotate in different directions, the main shaft diameter C and the connecting rod diameter on the first crankshaft 1221 and the second crankshaft 1222 also rotate in different directions, and therefore, the vibration generated by the centrifugal action of the first crankshaft 1221 and the second crankshaft 1222 partially cancels each other, so that the second order vibration of the engine can be reduced. Therefore, the crankcase assembly 120 of the present embodiment can reduce the first order vibration and the second order vibration with the simple structure, and does not need to add an additional member such as a balance shaft, and further does not need to calculate the mass, the mounting position, and the like of the balance shaft. Therefore, the structure in the embodiment occupies a smaller space, has a simpler structure and is less difficult to process.

More specifically, in the present embodiment, the specific structures of the first power connecting portion 12231 and the second power connecting portion 12232 are described below, and will not be explained herein too much.

Further, another embodiment of the present embodiment provides a crankcase assembly 120, the first power connection 12231 includes a first ring gear 122310, a first large gear 122311, and a first small gear 122312, and the second power connection 12232 includes a second ring gear 122320, a second large gear 122321, and a second small gear 122322.

Specifically, the first ring gear 122310 meshes with the first bull gear 122311, the first bull gear 122311 is coaxial with the first pinion gear 122312, the second ring gear 122320 meshes with the second bull gear 122321, the second bull gear 122321 is coaxial with the second pinion gear 122322, and the first pinion gear 122312 meshes with the second pinion gear 122322.

More specifically, the proximal end a of the first crankshaft 1221 is fixedly connected to the outer wall surface of the first ring gear 122310, and the proximal end a of the second crankshaft 1222 is fixedly connected to the outer wall surface of the second ring gear 122320.

More specifically, in the present embodiment, the reverse rotation mechanism 1223 is configured in such a manner that the two crankshafts (1221,1222) can be reversed by a simple gear train, which not only simplifies the structure, but also further reduces the volume of the crankcase assembly 120.

More specifically, in the present embodiment, the first large gear 122311 and the first small gear 122312 are rigidly connected coaxially, and the second large gear 122321 and the second small gear 122322 are rigidly connected coaxially (see the structure shown in fig. 2 in particular)

Further, the first power connection portion may also include a first ring gear and a first gear shaft, and the second power connection portion includes a second ring gear and a second gear shaft (the structure is not shown in the drawings).

Specifically, in the present embodiment, the first gear ring is meshed with one end of the first gear shaft, the second gear ring is meshed with one end of the second gear shaft, and the other end of the first gear shaft is meshed with the other end of the second gear shaft; and the number of the first and second electrodes,

the power output end of the first crankshaft is fixedly connected with the outer wall surface of the first gear ring, and the power input end of the second crankshaft is fixedly connected with the outer wall surface of the second gear ring.

Further, another embodiment of the present embodiment provides a crankcase assembly 120, as shown in fig. 2, wherein the first power connection 12231 and the second power connection 12232 are symmetrical about a center.

Specifically, in this embodiment, the first power connection portion 12231 and the second power connection portion 12232 are centrosymmetric, and the arrangement of such a structure can make the reverse rotation mechanism 1223 more stable during operation, and further make the first crankshaft 1221 and the second crankshaft 1222 more stable.

The crankcase assembly 120 of the present embodiment includes the first crankshaft 1221 and the second crankshaft 1222, and the reversing mechanism 1223 connected between the first crankshaft 1221 and the second crankshaft 1222, the reversing mechanism 1223 being capable of rotating the first crankshaft 1221 and the second crankshaft 1222 in different directions, and the crankcase assembly 120 adopting such a structure being capable of moving the piston D connected to the first crankshaft 1221 and the piston D connected to the second crankshaft 1222 in opposite directions, in which case, the pistons D in the cylinders 110 on both sides may collide with the inner wall surface of the cylinder 110 at different positions, for example, when the piston D in the L cylinder 110 on the left side collides with the top dead center of the cylinder 110, the piston D in the R cylinder 110 on the right side collides with the bottom dead center of the cylinder 110, and the collisions in both directions may partially cancel each other, so that first-order vibration can be reduced. Further, since the main shaft diameter C and the connecting rod diameter on the first crankshaft 1221 and the second crankshaft 1222 are also rotated in different directions, vibrations generated by the centrifugal action of the first crankshaft 1221 and the second crankshaft 1222 are partially cancelled out, and second-order vibrations of the engine can be reduced. Therefore, the crankcase assembly 120 of the present embodiment can reduce the first order vibration and the second order vibration with the simple structure, and does not need to add an additional member such as a balance shaft, and further does not need to calculate the mass, the mounting position, and the like of the balance shaft. Therefore, the structure in the embodiment occupies a smaller space, has a simpler structure and is less difficult to process.

More specifically, in the present embodiment, the fixed connection may be various forms of fixed connections, such as welding, bolt connection, and the like, which are commonly known to those skilled in the art, and may be specifically set according to actual design and use requirements, which is not limited in the present embodiment.

It should be understood that the crankcase assembly 120 in the present embodiment can be used in various types of engines, such as a two-stroke four-cylinder engine, a two-stroke six-cylinder engine, etc., and the specific use scenario thereof can be set according to actual design and use requirements, which is not limited in the present embodiment.

Example 2:

as shown in fig. 3, the embodiment of the present embodiment provides a two-stroke engine 10 including a plurality of cylinders 110 and a crankcase assembly 120 of embodiment 1.

Specifically, in the present embodiment, among the plurality of cylinders 110, the number of cylinders 110 positioned on the left side L and the number of cylinders 110 positioned on the right side R are equal (L is the left side and R is the right side as shown in fig. 3).

More specifically, in the present embodiment, the first crankshaft 1221 is drivingly connected to the cylinder block 110 on the left side L, and the second crankshaft 1222 is drivingly connected to the cylinder block 110 on the right side R.

More specifically, since the two-stroke engine 10 of the present embodiment employs the crankcase assembly 120 of embodiment 1, and since the crankcase assembly 120 of embodiment 1 includes the first crankshaft 1221 and the second crankshaft 1222, and the reversing mechanism 1223 connected between the first crankshaft 1221 and the second crankshaft 1222, the reversing mechanism 1223 can rotate the first crankshaft 1221 and the second crankshaft 1222 in different directions (i.e., the second crankshaft 1222 can rotate counterclockwise when the first crankshaft 1221 rotates clockwise), the crankcase assembly 120 employing such a structure can move the piston D connected to the first crankshaft 1221 and the piston D connected to the second crankshaft 1222 in opposite directions, in which case, the pistons D in the cylinders 110 located on both sides collide with the inner wall surface of the cylinder 110 at different positions, and when the piston D in the cylinder 110 located on the left side L collides with the top dead center of the cylinder 110, the piston D in the cylinder 110 located on the right side R collides with the bottom dead center of the cylinder 110 (i.e., when the piston D in the cylinder 110 located on the left side L collides with the top dead center of the cylinder 110), the piston D When the piston D moves upward, the piston D in the cylinder 110 on the right side R moves downward), the collisions in both directions can be partially offset, and the first-order vibration can be reduced. Therefore, the two-stroke engine 10 of the present embodiment can further reduce the vibration by using the crankcase assembly 120 of this structure.

More specifically, the number of the cylinders 110 may be an even number, such as 4, 6, 8, etc., which may be set according to actual design and use requirements.

More specifically, in the present embodiment, the crankshafts (1121,1222) are each connected to the pistons D in the respective cylinders 110 via connecting rods 113 (see the structure shown in fig. 3 and 4 in particular).

Further, another embodiment of the present embodiment provides a two-stroke engine 10, as shown in fig. 3 and 4, the two-stroke engine 10 including 4 cylinders 110, each cylinder 110 having at least 4 intake ports 111 and at least 2 exhaust ports 112; an intake valve mechanism 1111 is provided at the intake port 111, and an exhaust valve mechanism 1121 is provided at the exhaust port 112.

Specifically, in the present embodiment, when the piston D in each cylinder 110 is near the bottom dead center of the cylinder 110, both the intake valve mechanism 1111 and the exhaust valve mechanism 1121 are opened.

More specifically, in the present embodiment, the exhaust valve mechanism 1121 is disposed so that the exhaust port 112 of the cylinder 110 can be controlled more conveniently, and thus it can be ensured that the gas in the cylinder 110 can be combusted more sufficiently to apply work to the piston D during the work application process of the cylinder 110. The arrangement of the intake valve mechanism 1111 can enable the cylinder block 110 in the two-stroke engine 10 to timely enter air through the air inlet 111, so that pure air scavenging can be realized for the cylinder block 110, and the exhaust efficiency is improved. Therefore, the combustion work efficiency of the cylinder block 110 can be further improved by the arrangement of such a structure.

It should be understood that, in the present embodiment, the number of the air inlets 111 may be 4, or may be more. The number of the exhaust ports 112 is preferably 4 (2 are provided at the position corresponding to 111 in fig. 4, and only a part of the exhaust ports is shown in the figure), 2 may be provided, or a larger number may be provided, and the number of the exhaust ports is preferably 2 in the embodiment (specifically, refer to the structure shown in fig. 4). The above can be set according to actual design and use requirements, and this embodiment does not limit this.

Further, another embodiment of the present embodiment provides a two-stroke engine 10, as shown in fig. 4, the intake valve mechanism 1111 includes an intake valve 11110 and a first connecting rod 11111.

Specifically, in the present embodiment, one end of the first connecting rod 11111 is drivingly connected to the intake valve 11110, and the other end of the first connecting rod 11111 is drivingly connected to the first crankshaft 1221 or the second crankshaft 1222.

Further, another embodiment of the present embodiment provides a two-stroke engine 10, as shown in fig. 4, the exhaust valve mechanism 1121 includes a fixed block 11210, an exhaust valve 11211, and a transmission assembly 11212.

Specifically, in this embodiment, the fixed block 11210 is fixedly connected to the outer wall of the cylinder block 110 at a position close to the exhaust port 112, the exhaust valve 11211 is disposed at the exhaust port 112, one end of the transmission assembly 11212 is in transmission connection with the exhaust valve 11211, and the other end of the transmission assembly 11212 is in transmission connection with the first crankshaft 1221 or the second crankshaft 1222, so as to drive the exhaust valve 11211 to move away from or close to the exhaust port 112, and further open or close the exhaust port 112.

More specifically, in the present embodiment, the transmission assembly 11212 can drive the exhaust valve 11211 to perform a translational motion, and the opening or closing of the exhaust valve 11211 can be controlled by the simple structure, which is simpler in structure.

Further, another embodiment of the present embodiment provides a two-stroke engine 10, where an intake passage 11112 is provided in a position of the cylinder block 110 corresponding to each intake port 111, one end of the intake passage 11112 communicates with the intake port 111, and the other end of the intake passage 11112 communicates with an intake pipe, so that gas is introduced into the intake passage 11112 through the intake pipe.

Specifically, in the present embodiment, an exhaust passage 112110 is provided at a position corresponding to each exhaust port 112 of each fixed block 11210, and one end of an exhaust passage 112110 communicates with the exhaust port 112 and the other end communicates with the exhaust system of the automobile.

Further, another embodiment of the present embodiment provides a two-stroke engine 10, as shown in fig. 4, the transmission assembly 11212 includes a second connecting rod 112121, a return spring 112122, a sliding rod 112123, a rotation connecting portion 112124, and a grooved cam 112125.

Specifically, in the present embodiment, one end of the second connecting rod 112121 is in transmission connection with the exhaust valve 11211, and the other end of the second connecting rod 112121 is rotatably connected with the sliding rod 112123 through the rotating connecting portion 112124; the return spring 112122 is sleeved on the second connecting rod 112121, and one end of the return spring 112122, which is far away from the sliding rod 112123, is clamped with the outer wall surface of the second connecting rod 112121; the length direction of the sliding rod 112123 is perpendicular to the length direction of the return spring 112122, one end of the sliding rod 112123 facing away from the return spring 112122 penetrates and is slidably connected to a groove in the groove cam 112125, the groove cam 112125 is rotatably connected to the fixed block 11210 through a rotating shaft 112126, and the rotating shaft 112126 is in transmission connection with the first crankshaft 1221 or the second crankshaft 1222.

More specifically, in the present embodiment, when the curved profile portion of the groove cam 112125 contacts the sliding rod 112123, the groove cam 112125 pushes the sliding rod 112123 to move the second connecting rod 112121 toward the exhaust port 112, so that the return spring 112122 is in a compressed state, and the second connecting rod 112121 links the exhaust valve 11211 to the exhaust port 112 to close the exhaust port 112.

When the groove portion of the groove cam 112125 contacts the slide bar 112123, the second connecting rod 112121 is moved away from the exhaust port 112 by the elastic force of the return spring 112122, and the second connecting rod 112121 links the exhaust valve 11211 away from the exhaust port 112 to open the exhaust port 112.

More specifically, in the embodiment, the transmission assembly 11212 is composed of the second connecting rod 112121, the return spring 112122, the sliding rod 112123, the rotating connecting portion 112124 and the grooved cam 112125, in this case, when the exhaust valve 11211 needs to be closed, the curved profile portion of the grooved cam 112125 can be rotated to be in contact with the sliding rod 112123, and the second connecting rod 112121 can be made to link the exhaust valve 11211 to be close to the exhaust port 112, so as to close the exhaust port 112. When the exhaust valve 11211 needs to be opened, the groove portion of the groove cam 112125 can be rotated to contact the sliding rod 112123, and the elastic force generated by the return spring 112122 can move the second connecting rod 112121 away from the exhaust port 112 to open the exhaust port 112.

More specifically, in the present embodiment, the rotation connecting portion 112124 may be provided as a bearing. The sliding rod 112123 is in interference fit with the inner ring of the bearing, and the second connecting rod 112121 is fixedly connected with the outer ring of the bearing.

More specifically, the configuration of the transmission assembly 11212 is such that the grooved cam 112125 is configured to advance or retard the opening and closing of the exhaust valve 11211 as needed, so that the combustion gas is more fully combusted and acts on the piston D, and the residual energy of the combustion gas, i.e., the exhaust port opened, is not exhausted, as in the conventional two-stroke engine. In addition, the engine adopts the overhead intake valve to scavenge pure air, so that the exhaust efficiency can be improved, and meanwhile, redundant air is cooled in the cylinder body 110, so that the combustion condition in the cylinder body 110 is more suitable for improving the compression ratio and the ignition advance angle, the combustion work efficiency is improved, and the two-stroke engine 10 in the embodiment has better environmental protection and emission performance.

More specifically, in the present embodiment, if the opening timing of the exhaust valves 11211 needs to be adjusted, the shape of the groove cam 112125 needs to be redesigned. Therefore, the transmission assembly 11212 in this embodiment is more convenient to design.

Further, another embodiment of the present embodiment provides a two-stroke engine 10, as shown in fig. 4, in which the angle between two adjacent main shaft diameters C on the first crankshaft 1221 and two adjacent main shaft diameters C on the second crankshaft 1222 is 90 °.

Specifically, in the present embodiment, the angle between two adjacent main shaft diameters C on the first crankshaft 1221 and two adjacent main shaft diameters C on the second crankshaft 1222 is 90 °, and by providing such a structure, the angle between two adjacent main shaft diameters C on the first crankshaft 1221 and two adjacent main shaft diameters C on the second crankshaft 1222 is small, and is in a cross-shaft structure, so that the vibration of the two-stroke engine 10 can be reduced.

Further, in this embodiment, the transmission assembly 11212 may also be provided with a valve timing system (not shown in the figure) to perform the functions of early opening and late closing of the exhaust valve 11211. Eventually, the gas use efficiency of the two-stroke engine 10 according to the present embodiment is improved.

It is to be understood that the specific structure of the valve timing system is similar to that of the valve timing system in the related art, and this embodiment will not be explained in detail.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A crankcase assembly comprises a crankcase body and a crankshaft transmission mechanism, wherein the crankshaft transmission mechanism is arranged in the crankcase body; characterized in that, the crankshaft drive mechanism includes:

2. The crankcase assembly of claim 1, wherein the first power connection includes a first ring gear, a first bull gear, and a first pinion gear, and the second power connection includes a second ring gear, a second bull gear, and a second pinion gear; wherein the content of the first and second substances,

3. The crankcase assembly of claim 1, wherein the first power connection and the second power connection are centrosymmetric.

4. A two-stroke engine comprising a plurality of cylinders, wherein the two-stroke engine further comprises a crankcase assembly according to any one of claims 1-3; wherein the content of the first and second substances,

5. A two-stroke engine according to claim 4, wherein the two-stroke engine comprises 4 said blocks, each of which is provided with at least 4 intake ports and at least 2 exhaust ports; an air inlet valve mechanism is arranged at the air inlet, and an exhaust valve mechanism is arranged at the exhaust port; wherein the content of the first and second substances,

6. The two-stroke engine according to claim 5, wherein the intake valve mechanism includes an intake valve and a first connecting rod; wherein the content of the first and second substances,

7. The two-stroke engine according to claim 5, wherein the exhaust valve mechanism includes a fixed block, an exhaust valve and a transmission assembly; wherein the content of the first and second substances,

8. The two-stroke engine according to claim 7, wherein an intake passage is provided in the cylinder block at a position corresponding to each of the intake ports, one end of the intake passage communicates with the intake port, and the other end of the intake passage communicates with an intake pipe, so that gas is introduced into the intake passage through the intake pipe; and the number of the first and second electrodes,

9. The two-stroke engine according to claim 8, wherein the transmission assembly includes a second connecting rod, a return spring, a slide rod, a rotational connection and a grooved cam; wherein the content of the first and second substances,

10. A two-stroke engine according to any one of claims 7 to 9, wherein the angle between two adjacent main shaft diameters on the first crankshaft and two adjacent main shaft diameters on the second crankshaft is 90 °.