A two-stroke free piston engine

Abstract

The application discloses a two-stroke free piston engine, which comprises two opposite cylinders, a swing gear, a first one-way clutch, a second one-way clutch, a first power output and a second power output, and a piston connected through a push rod, wherein the swing gear is engaged with a rack on the push rod, the swing gear is connected with the first power output through the first one-way clutch and connected with the second power output through the second one-way clutch, and the piston makes a linear reciprocating motion once to form a first stroke and a second stroke in sequence, and in each stroke, one cylinder works and the other cylinder compresses to ensure the output power of each stroke, and the power of the two power outputs is coupled and then outputted as continuous power through a transmission unit. Thus, the complex transmission mechanism formed by the push rod, the crankshaft and the like in the prior art can be cancelled, the linear reciprocating motion of the piston is converted into rotary motion, the power in the rotary form is outputted, and the engine efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to a two-stroke free piston engine. Background Technology

[0002] Hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), and range-extended electric vehicles (REEV) are the main technological routes for energy-saving and new energy vehicles. What they have in common is that they all contain a piston engine with a crankshaft and convert fuel (such as gasoline, diesel, methanol, natural gas, hydrogen, etc.) into mechanical energy. Moreover, HEV, PHEV, and REEV all need to maximize the energy conversion efficiency of the engine.

[0003] The power generated by existing piston engines is transmitted from the piston to the pushrod, which then transmits the power to the crankshaft via the crank, thus converting it into rotational motion and outputting power. Due to the limitations of the pushrod and crankshaft, the piston stroke is fixed, so the compression ratio cannot be adjusted or optimized according to power requirements, which limits the system's thermal efficiency. Furthermore, when the piston is working, the pushrod applies a reaction force, the lateral component of which presses the piston tightly against the cylinder wall, greatly increasing friction and energy loss.

[0004] At the beginning of the power stroke, the pressure inside the cylinder is at its maximum, but the crankshaft is close to top dead center at this time, the pushrod lever arm on the crankshaft is very small, the torque generated is small, and therefore the output power is also small. At the same time, the energy contained in the high temperature and high pressure gas is released slowly, and the energy loss caused by gas leakage and heat loss also increases accordingly.

[0005] When the power stroke is nearing its end, the crankshaft is close to bottom dead center, the pushrod lever arm on the crankshaft is small, the pressure inside the cylinder is small, and therefore the output power is also small, which reduces the engine's power density and increases the fluctuation of output power.

[0006] In addition, the load between the pushrod and the crankshaft, and between the crankshaft and the housing, is very large, resulting in significant frictional losses. Furthermore, high-pressure oil is required to lubricate the bearings, and the oil pump consumes energy, thereby reducing engine efficiency. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a two-stroke free piston engine that eliminates the complex transmission mechanism consisting of pushrods and crankshafts found in existing technologies, and converts the linear reciprocating motion of the piston into rotary motion to output rotational power, thereby improving engine efficiency.

[0008] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0009] This invention provides a two-stroke free piston engine, comprising two opposing cylinders and a transmission unit. The transmission unit includes a rocker gear, a first one-way clutch, a second one-way clutch, a first power output component, and a second power output component. The first power output component engages with the first one-way clutch, and the second power output component engages with the second one-way clutch. Both the first and second power output components are used to transmit engine torque. The pistons of the two cylinders are connected by a push rod. The rocker gear meshes with a rack on the push rod, and the rocker gear is fixed-axis rotating. Each reciprocating linear motion of the piston sequentially forms the first and second strokes. In each stroke, one cylinder is always performing power while the other cylinder is compressing, ensuring that each stroke... Each stroke outputs power and is capable of proceeding to the next stroke; in the first stroke, the push rod drives the rocker gear to rotate in a first direction via the rack, and the rocker gear is connected to the first power output component via the first one-way clutch to ensure that the first power output component transmits torque, and simultaneously the second one-way clutch disengages to ensure that the second power output component idles in the same direction as the rotation direction of the previous stroke; in the second stroke, the push rod drives the rocker gear to rotate in a second direction opposite to the first direction via the rack, and the rocker gear is connected to the second power output component via the second one-way clutch to ensure that the second power output component transmits torque, and simultaneously the first one-way clutch disengages to allow the first power output component to idle in the same direction as the rotation direction of the previous stroke.

[0010] In one embodiment, the rocker gear is directly driven to the first power output component via the first one-way clutch, and the rocker gear is directly driven to the second power output component via the second one-way clutch.

[0011] Furthermore, the first power output component and the second power output component are respectively an output shaft or an output wheel for outputting torque.

[0012] In one embodiment, the transmission unit further includes a coupling mechanism, through which the first power output component and the second power output component are connected, coupling the power alternately output by the two power output components into a single, continuous power output, and the direction of rotation remains unchanged.

[0013] Furthermore, the rocker gear and / or the first power output component and / or the second power output component are connected by the coupling mechanism to couple the power output of every two consecutive strokes and ensure continuous power output, while the power output direction remains unchanged.

[0014] Furthermore, the coupling mechanism includes a coupling gear and a first output gear and a second output gear arranged coaxially. The first power output component includes a first output shaft lockably connected to the first one-way clutch and a first gear fixed to the first output shaft. The second power output component includes a second output shaft lockably connected to the second one-way clutch and a second gear fixed to the second output shaft. The first output gear is driven to connect to the first gear through the coupling gear, and the second output gear meshes with the second gear.

[0015] Furthermore, the coupling mechanism includes a coupling gear and a first output gear and a second output gear arranged coaxially. Both the first power output component and the second power output component are gears. A first one-way clutch is provided between the shaft of the first power output component and the shaft of the rocker gear, and a second one-way clutch is provided between the shaft of the second power output component and the shaft of the rocker gear. The first output gear is driven to connect to the first power output component through the coupling gear, and the second output gear meshes with the second power output component.

[0016] Furthermore, the coupling mechanism includes a transmission gear set, the shaft of the rocker gear is fixedly connected to the transmission gear set, the transmission gear set is driven to the first power output component through the first one-way clutch, and is driven to the second power output component through the second one-way clutch, thereby forming an indirect drive configuration.

[0017] Furthermore, the first power output component includes a first output shaft lockably connected to the first one-way clutch and a first gear fixed to the first output shaft; the second power output component includes a second output shaft lockably connected to the second one-way clutch and a second gear fixed to the second output shaft, wherein the first gear and the second gear mesh with each other.

[0018] Furthermore, the coupling mechanism includes a coupling gear and a transmission gear set. The shaft of the rocking gear is fixedly connected to the transmission gear set. The first power output component is a gear. The shaft of the rocking gear is directly driven to the first power output component via the first one-way clutch. The second power output component includes a second output shaft lockably connected to the second one-way clutch and a second gear fixed to the second output shaft. The transmission gear set is driven to the second output shaft via the second one-way clutch. The first power output component is driven to the second gear via the coupling gear.

[0019] The technical solution provided by this invention has the following beneficial effects:

[0020] This invention eliminates the complex transmission mechanism consisting of crankshafts and other components found in existing technologies, thereby reducing overall costs. Furthermore, by using a push rod with a rack to drive a single rocker gear to rotate on a fixed axis, it converts the linear reciprocating motion of the piston into rotary motion, outputting rotational power to drive a rotary generator with stable power generation efficiency. This improves the conversion efficiency from mechanical energy to electrical energy, while also increasing engine efficiency. It can also serve as a direct power source for driving HEV, PHEV, and REEV vehicles. Attached Figure Description

[0021] Figure 1 The diagram shown is a partial schematic of a two-stroke free piston engine in Embodiment 1, where the second cylinder is in the scavenging state.

[0022] Figure 2 The diagram shown is a partial schematic of a two-stroke free piston engine in Embodiment 1, where the first cylinder is in the power stroke state.

[0023] Figure 3 The diagram shown is a partial schematic of a two-stroke free piston engine in Embodiment 1, where the first cylinder is in the scavenging state.

[0024] Figure 4 The diagram shown is a partial schematic of a two-stroke free piston engine in Embodiment 1, where the second cylinder is in the power stroke state.

[0025] Figure 5 The diagram shown is a connection diagram of a two-stroke free piston engine in Embodiment 1.

[0026] Figure 6 The diagram shown is a connection schematic of the two-stroke free piston engine in Embodiment 2;

[0027] Figure 7 The diagram shown is a connection schematic of the two-stroke free piston engine in Embodiment 3;

[0028] Figure 8 The diagram shown is a connection diagram of the two-stroke free piston engine in Embodiment 4. Detailed Implementation

[0029] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0030] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] Reference Figures 1 to 5 As shown, this embodiment provides a two-stroke free piston engine (hereinafter referred to as a piston engine). The piston engine of this embodiment includes two cylinders arranged opposite to each other, namely a first cylinder 1a and a second cylinder 1b, and the pistons of the first cylinder 1a and the second cylinder 1b are the first piston 2a and the second piston 2b, respectively.

[0033] Piston engines also include a transmission unit, such as Figure 5 The transmission unit shown includes a rocker gear 4, a first one-way clutch 5a, a second one-way clutch 5b, a first power output component 6a, a second power output component 6b, and a coupling mechanism 100. The first power output component 6a engages with the first one-way clutch 5a, and the second power output component 6b engages with the second one-way clutch 5b. Both the first power output component 6a and the second power output component 6b are used to transmit engine torque. The coupling mechanism 100 is a downstream component of both power output components.

[0034] like Figure 2 and Figure 4 As shown, the first piston 2a of the first cylinder 1a and the second piston 2b of the second cylinder 1b are connected by a push rod 3, and the push rod 3 is provided with a rack. The rocker gear 4 meshes with the rack 31 on the push rod 3, and the rocker gear 4 is set to rotate around a fixed axis so that the rocker gear 4 can rock around its own axis.

[0035] Each time the piston makes a linear reciprocating motion, it forms the first stroke and the second stroke in sequence. In each stroke, one cylinder is always doing work and another cylinder is compressing, so as to ensure that power is output in each stroke and that the next stroke can be carried out.

[0036] During the first stroke, the rocker gear 4 is connected to the first power output component 6a via the first one-way clutch 5a to ensure that the first power output component 6a transmits torque, and simultaneously the second one-way clutch 5b disengages to ensure that the second power output component 6b rotates in the same direction as the rotation direction of the previous stroke.

[0037] During the second stroke, the rocker gear 4 is connected to the second power output component 6b via the second one-way clutch 5b to ensure that the second power output component 6b transmits torque, and simultaneously the first one-way clutch 5a disengages so that the first power output component 6a rotates in the same direction as the rotation direction of the previous stroke.

[0038] In this embodiment, the push rod 3 is a linear rod structure. The piston moves from one end of the cylinder to the other end of the cylinder in one stroke. One round trip is one round trip, and two strokes constitute one working cycle.

[0039] Firstly, as Figure 1 As shown, at the end of the stroke of the previous working cycle, the first piston 2a of the first cylinder 1a moves to the leftmost end of the first cylinder 1a, and the air-fuel mixture in the first cylinder 1a is compressed. The second cylinder 1b completes scavenging, blowing out the exhaust gas and blowing in the air-fuel mixture. Then, as... Figure 2 As shown, when the first cylinder 1a is ignited and combusted, the first cylinder 1a is in the power stroke, the pressure in the first cylinder 1a increases, pushing the first piston 2a to move to the right, and pushing the second piston 2b to move to the right through the push rod 3, compressing the air and fuel mixture in the second cylinder 1b, the second cylinder 1b is in the compression stroke, and at this time the two pistons move synchronously to the right in a straight line to form the first stroke.

[0040] Then as Figure 3 As shown, when the second piston 2b of the second cylinder 1b moves to the rightmost end of the second cylinder 1b, the compression stroke ends, the first cylinder 1a performs scavenging, blowing out the exhaust gas and blowing in the air-fuel mixture; the air-fuel mixture in the second cylinder 1b is compressed. Finally, as... Figure 4 As shown, when combustion occurs in the second cylinder 1b, the second cylinder 1b enters the power stroke. The pressure inside the second cylinder 1b increases, pushing the second piston 2b to the left. This, in turn, pushes the first piston 2a to the left via the push rod 3, compressing the air-fuel mixture inside the first cylinder 1a. The first cylinder 1a is in the compression stroke, and at this time, both pistons move synchronously to the left in a linear motion, forming the second stroke. Then, the next working cycle begins.

[0041] Therefore, one reciprocating linear motion of the piston forms a working cycle, and the next working cycle begins immediately after the first working cycle is completed.

[0042] When the piston and push rod 3 reciprocate in the left and right directions, the rack 31 on the push rod 3 drives the rocker gear 4 to rotate. During the first stroke, the rack 31 moving to the right drives the rocker gear 4 to rotate clockwise. During the second stroke, the rack 31 moving to the left drives the rocker gear 4 to rotate counterclockwise. This achieves the transformation of the piston's reciprocating linear motion into the fixed-axis rocker rotation of the rocker gear 4 through the meshing transmission between the rack 31 on the push rod 3 and the rocker gear 4.

[0043] like Figure 5As shown, the rocker gear 4 rotates on a fixed axis and can rock around its own axis. The rocker gear 4 is connected to the first power output component 6a through the first one-way clutch 5a, or to the second power output component 6b through the second one-way clutch 5b. Since the locking directions of the first one-way clutch 5a and the second one-way clutch 5b are set to be opposite to each other, when the rocker gear 4 rotates, one power output component is always in transmission and the other power output component is idling. This ensures that the two power output components alternately transmit torque and idle in the two strokes of one cycle of the piston engine. The rotation direction of each power output component remains unchanged. In addition, the two power output components can output power independently and are each connected to a load (such as a generator).

[0044] The first one-way clutch 5a locks during the first stroke, and the clockwise rotating rocker gear 4 drives the first power output member 6a to rotate clockwise and transmit power through the first one-way clutch 5a; then the first one-way clutch 5a disengages during the second stroke, so that the rocker gear 4, which has rotated counterclockwise, is separated from the first power output member 6a, and the first power output member 6a can continue to rotate clockwise without load.

[0045] Synchronously, the second one-way clutch 5b disengages during the first stroke, causing the clockwise rotating rocker gear 4 to separate from the second power output member 6b, which then rotates counterclockwise under no load. Next, the second one-way clutch 5b locks during the second stroke, causing the counterclockwise rotating rocker gear 4 to drive the second power output member 6b to rotate counterclockwise and transmit torque through the second one-way clutch 5b.

[0046] In summary, the first power output component 6a rotates and outputs torque during the first stroke, but idles during the second stroke while maintaining its rotation direction. The second power output component 6b idles during the first stroke, but outputs torque during the second stroke while maintaining its rotation direction.

[0047] More specifically, such as Figure 5 As shown, the specific coupling mechanism 100 includes a coupling gear 8 and a first output gear 10 and a second output gear 9 arranged coaxially. The first power output component 6a and the second power output component 6b are connected by the coupling mechanism 100 to couple the power output of every two consecutive strokes and ensure continuous power output. The power output direction remains unchanged, that is, the piston engine has only one power output and can continuously output power. To achieve this, the two power output components need to be coupled together.

[0048] More specifically, the first power output component 6a includes a first output shaft 61 lockably connected to the first one-way clutch 5a and a first gear 62 fixed to the first output shaft 61; the second power output component 6b includes a second output shaft 63 lockably connected to the second one-way clutch 5b and a second gear 64 fixed to the second output shaft 63, the first output gear 10 drives the first gear 62 connected to the first power output component 6a through the coupling gear 8, and the second output gear 9 meshes with the second gear 64 of the second power output component 6b.

[0049] In addition, in this specific embodiment, the first output shaft 61 and the first gear 62 of the first power output component 6a are fixedly connected and rotate in the same direction. The first gear 62 of the first power output component 6a meshes with the coupling gear 8 and rotates in opposite directions, and the coupling gear 8 meshes with the first output gear 10 and rotates in opposite directions.

[0050] The second output shaft 63 and the second gear 64 of the second power output component 6b are fixedly connected and rotate in the same direction. The second gear 64 of the second power output component 6b meshes with the second output gear 9, but they rotate in opposite directions.

[0051] The first output gear 10 and the second output gear 9 are coaxially fixedly connected via shaft 91 to achieve rotation in the same direction.

[0052] During the first stroke, the push rod 3, moving to the right, drives the rocker gear 4 to rotate clockwise, locking the first one-way clutch 5a. The rocker gear 4 drives the first power output component 6a to rotate clockwise through the first one-way clutch 5a. The first gear 62 of the first power output component 6a drives the coupling gear 8 to rotate counterclockwise. The coupling gear 8 drives the first output gear 10 and the second output gear 9 to rotate clockwise together and transmit power. At the same time, the second one-way clutch 5b disengages, and the second output shaft 63 of the second power output component 6b can rotate counterclockwise without constraint. The clockwise rotating second output gear 9 drives the second power output component 6b to rotate counterclockwise.

[0053] During the second stroke, the push rod 3, moving to the left, drives the rocker gear 4 to rotate counterclockwise, locking the second one-way clutch 5b. The rocker gear 4, through the second one-way clutch 5b, drives the second power output component 6b to rotate counterclockwise. The second gear 64 of the second power output component 6b drives the second output gear 9 and the first output gear 10 to rotate clockwise together and transmit power. The first output gear 10 drives the coupling gear 8 to rotate counterclockwise. At the same time, the first one-way clutch 5a disengages, and the first output shaft 61 can rotate clockwise without constraint. That is, the first output gear 10 drives the coupling gear 8 to rotate counterclockwise, and the coupling gear 8 drives the first power output component 6a to rotate clockwise together.

[0054] Therefore, during the first stroke, the rocker gear 4 drives the first output component 6a to rotate clockwise via the first one-way clutch 5a. The first output component drives the coupling gear 8 to rotate counterclockwise. The coupling gear 8 drives the first output gear 10 to rotate clockwise. The second output gear 9, which is coaxially fixed to the first output gear 10, drives the second output component 6b to rotate counterclockwise. The shaft 91 of the second output gear 9 and the first output gear 10 rotates clockwise and outputs power. During the second stroke, the rocker gear 4 drives the first output component 6b to rotate counterclockwise via the second one-way clutch 5b. The second output component 6b drives the second output gear 9 to rotate clockwise. The first output gear 10, which is coaxially fixed to the second output gear 9, drives the coupling gear 8 to rotate counterclockwise. The coupling gear 8 drives the first output component 6a to rotate clockwise. The shaft 91 of the second output gear 9 and the first output gear 10 rotates clockwise and outputs power.

[0055] In other words, the shaft 91 of the second output gear 9 and the first output gear 10 is continuously driven to rotate clockwise, with its rotation direction remaining unchanged or its power output direction remaining unchanged, thus achieving power coupling between the two power output components. Simultaneously, whether in transmission or idling, the rotation direction of all gears and shafts downstream of the two one-way clutches remains unchanged. Specifically, the first output component 6a, the second output gear 9, and the first output gear 10 rotate clockwise, while the second output component 6b and the coupling gear 8 rotate counterclockwise. Through power coupling, any shaft and gear downstream of the two one-way clutches—namely, the first output component 6a, the second output component 6b, the coupling gear 8, the second output gear 9, and the first output gear 10—can serve as the total output.

[0056] In one working cycle of the piston engine in this embodiment, the piston engine has a variable stroke and compression ratio. The variable compression ratio allows the use of different fuels to improve the flexibility and adaptability of the piston engine, promotes HCCI combustion to ensure higher thermal efficiency, and can also improve the potential for SI-HCCI conversion through the variable compression ratio.

[0057] This embodiment replaces the complex transmission mechanism composed of crankshaft and other components in the prior art with a push rod 3 equipped with rack 31 and a transmission unit. This not only reduces the number of moving parts, simplifies the transmission structure, and reduces the overall cost, but also eliminates the need for high-pressure oil-lubricated bearings, thereby eliminating the need for an oil pump, thus reducing energy consumption and improving the system's energy conversion efficiency. It also effectively reduces the lateral load on the engine piston, thereby reducing the friction loss between the piston and the cylinder wall.

[0058] Furthermore, by driving a single rocker gear 4 to rotate through the rack 31 on the push rod 3, the linear reciprocating motion of the piston of the piston engine is converted into rotational motion, so as to output rotational power to drive a rotary generator with stable power generation efficiency, thereby improving the conversion efficiency of mechanical energy into electrical energy. At the same time, it can also improve engine efficiency and can be used as direct power to drive vehicles such as HEV, PHEV and REEV.

[0059] Of course, in other embodiments, if the transmission unit adopts a double rocker gear design, the two rocker gears need to withstand the huge thrust output by the piston during operation, and the load fluctuates greatly. The technical requirements for the gears, gear shafts, and bearings are high, and the cost is also high. Arranging two rocker gears between the two cylinders requires more space, and the stiffness of the push rod 3 needs to be enhanced. However, this embodiment uses a transmission unit with a single rocker gear, which can reduce costs, reduce size and weight, and improve design flexibility.

[0060] In addition, when the piston of the piston engine is around the top dead center, its acceleration is significantly higher, thereby reducing the residence time at high temperature and reducing heat transfer loss during combustion. When the piston of the piston engine is around the bottom dead center, the lever arm of push rod 3 does not decrease, and the output power decays less, so as to achieve small output power fluctuation.

[0061] Compared to existing piston engines, which exhibit strong vibrations in the x, y, and z axes, the piston engine in this embodiment only experiences strong vibrations in one direction (i.e., the piston moves along the left and right directions), resulting in a significant improvement in NVH (noise, vibration, and acoustic roughness) characteristics.

[0062] Example 2

[0063] like Figure 6 As shown, Embodiment 2 provides a two-stroke free piston engine. Embodiment 2 is largely the same in structure as Embodiment 1, except that both the first power output component 6a' and the second power output component 6b' are gears. A first one-way clutch 5a is provided between the first power output component 6a' and the shaft 41 of the rocker gear 4, and a second one-way clutch 5b is provided between the second power output component 6b' and the shaft 41 of the rocker gear 4. The two power output components alternately transmit torque and perform corresponding idling within the two strokes of one cycle of the piston engine, and the rotation direction of each power output component remains unchanged. Furthermore, the two power output components can output power independently and are each connected to a load (such as a generator). Of course, the movement of the push rod, rocker gear 4, and two cylinders in Embodiment 2 is the same as in Embodiment 1. Figures 1 to 4 As shown, it will not be elaborated further here.

[0064] In this specific embodiment, the first one-way clutch 5a is arranged between the shaft 41 of the rocker gear 4 and the first power output member 6a', and the second one-way clutch 5b is arranged between the shaft 41 of the rocker gear 4 and the second power output member 6b'. The first power output member 6a' meshes with the coupling gear 8 and rotates in opposite directions; the coupling gear 8 meshes with the first output gear 10 and rotates in opposite directions; the second power output member 6b' meshes with the second output gear 9 and rotates in opposite directions.

[0065] During the first stroke, the rocker gear 4 rotates clockwise, the first one-way clutch 5a locks, and the rocker gear 4 drives the first power output component 6a' to rotate clockwise through the first one-way clutch 5a. The first power output component 6a' drives the coupling gear 8 to rotate counterclockwise and transmit power. The coupling gear 8 drives the first output gear 10 and the second output gear 9 to rotate clockwise together and transmit power. At the same time, the second one-way clutch 5b disengages, and the second power output component 6b' can rotate freely without restraint. The clockwise rotating second output gear 9 drives the second power output component 6b' to rotate counterclockwise.

[0066] During the second stroke, the rocker gear 4 rotates counterclockwise, the second one-way clutch 5b locks, and the rocker gear 4 drives the second power output component 6b' to rotate counterclockwise through the second one-way clutch 5b. The second power output component 6b' drives the second output gear 9 and the first output gear 10 to rotate clockwise together and transmit power. At this time, the first output gear 10 drives the coupling gear 8 to rotate counterclockwise. At the same time, the first one-way clutch 5a disengages, and the first power output component 6a' can rotate freely without restraint. The first power output component 6a' rotates clockwise freely because the counterclockwise rotating coupling gear 8 drives the first power output component 6a' to rotate freely.

[0067] In summary, during the first stroke, the shafts 91 of the second output gear 9 and the first output gear 10 are driven to rotate clockwise; during the second stroke, the shafts 91 of the second output gear 9 and the first output gear 10 are driven to rotate clockwise. That is to say, the shafts 91 of the second output gear 9 and the first output gear 10 are continuously driven to rotate clockwise, and their rotation direction remains unchanged or the power output direction remains unchanged, thus achieving power coupling between the two power output components. After power coupling, any shaft and gear downstream of the two one-way clutches, namely the first power output component 6a', the second power output component 6b', the coupling gear 8, the second output gear 9, and the first output gear 10, can all serve as the main output shaft.

[0068] Example 3

[0069] like Figure 7As shown, Embodiment 3 provides a two-stroke free piston engine. Embodiment 3 and Embodiment 1 have largely the same structure, except that the coupling mechanism 100' further includes a transmission gear set 200, comprising gear A, gear B, and gear C. Gear A is fixedly mounted on the shaft 41 of the rocker gear 4. Gear A meshes with gear B and gear C respectively. Gear B is driven to connect to the first power output component 6a via a first one-way clutch 5a, and gear C is driven to connect to the second power output component 6b via a second one-way clutch 5b, thus forming an indirect drive configuration. The two power output components alternately transmit torque and perform corresponding idling within the two strokes of one cycle of the piston engine. The rotation direction of each power output component remains unchanged, and each power output component can output power independently and be connected to a load (such as a generator). Of course, the movement of the push rod, rocker gear 4, and two cylinders in Embodiment 3 is the same as in Embodiment 1. Figures 1 to 4 As shown, it will not be elaborated further here.

[0070] In this specific embodiment, the first power output component 6a includes a first output shaft 61 lockably connected to the first one-way clutch 5a and a first gear 62 fixed to the first output shaft 61; the second power output component 6b includes a second output shaft 63 lockably connected to the second one-way clutch 5b and a second gear 64 fixed to the second output shaft 63, and the first gear 62 of the first power output component 6a and the second gear 64 of the second power output component 6b mesh with each other.

[0071] The rocker gear 4 is driven to connect with the first output shaft 61 of the first power output member 6a through gear A, gear B and the first one-way clutch 5a to form the first torque transmission route.

[0072] The rocker gear 4 is driven to connect with the second output shaft 63 of the second power output component 6b via gear A, gear C and the second one-way clutch 5b to form a second torque transmission path.

[0073] During the first stroke, the push rod drives the rocker gear 4 and gear A to rotate clockwise together. Gear A drives gears B and C to rotate counterclockwise simultaneously. The first one-way clutch 5a is locked. Gear B drives the first power output component 6a to rotate counterclockwise through the first one-way clutch 5a. At the same time, the second one-way clutch 5b is disengaged, and the second power output component 6b can rotate clockwise without restraint. The first gear 62 of the first power output component 6a drives the second power output component 6b to rotate clockwise.

[0074] During the second stroke, the push rod drives the rocker gear 4 and gear A to rotate counterclockwise, and gear A drives gears B and C to rotate clockwise simultaneously. The second one-way clutch 5b is locked, and gear C drives the second power output component 6b to rotate clockwise through the second one-way clutch 5b. At the same time, the first one-way clutch 5a is disengaged, and the first power output component 6a can rotate freely without restraint. The second gear 64 drives the first power output component 6a to rotate counterclockwise.

[0075] In summary, during the first stroke, the second output shaft 63 of the second power output component 6b is driven to rotate clockwise; during the second stroke, the second power output component 6b is still driven to rotate clockwise. That is, the second power output component 6b is continuously driven to rotate clockwise, with its rotation direction remaining unchanged or its power output direction remaining unchanged, thus coupling the power of the two power output components. Similarly, the first output shaft 61 of the first power output component 6a is continuously driven to rotate counterclockwise; and after power coupling, any shaft and gear downstream of the two one-way clutches, i.e., the first power output component 6a and the second power output component 6b, can serve as the main output shaft to achieve alternating operation of the two continuous strokes, and the rocker gear 4 can also continuously rock and rotate.

[0076] Example 4

[0077] like Figure 8 As shown, Embodiment 4 provides a two-stroke free piston engine. The structure of Embodiment 4 is largely the same as that of Embodiment 3, except that: the transmission gear set 200' in this embodiment includes gear D and gear E, wherein gear D is fixed on the shaft 41 of the rocker gear 4, and gear D meshes with gear E. The first power output component 6a' is the first gear, and the shaft 41 of the rocker gear 4 is directly driven to the first power output component 6a' through the first one-way clutch 5a; the second power output component 6b includes a second output shaft 63 that can be locked to the second one-way clutch 5b and a second gear 64 fixed to the second output shaft 63. Gear E is driven to the second output shaft 63 of the second power output component 6b through the second one-way clutch 5b; moreover, the second output shaft 63 and the second gear 64 are coaxially fixedly connected, and the first power output component 6a' is driven to the second gear 64 of the second power output component 6b through the coupling gear 8 to achieve power coupling. The two power take-off components alternately transmit torque and idle within two strokes of one cycle of the piston engine, and the rotation direction of each power take-off component remains unchanged. Furthermore, each power take-off component can output power independently and is connected to a load (such as a generator). Of course, the movement of the push rod, rocker gear 4, and the two cylinders in Embodiment 4 is the same as in Embodiment 1. Figures 1 to 4 As shown, it will not be elaborated further here.

[0078] During the first stroke, the first cylinder performs work, and the push rod drives the rocker gear 4 and gear D to rotate clockwise. Gear D drives gear E to rotate counterclockwise. The first one-way clutch 5a locks, and the rocker gear 4 drives the first power output component 6a' to rotate clockwise through the first one-way clutch 5a. The first power output component 6a' drives the coupling gear 8 to rotate counterclockwise and transmits power. At the same time, the second one-way clutch 5b disengages. Since the second power output component 6b can rotate freely without restraint, the coupling gear 8 drives the second power output component 6b to rotate clockwise.

[0079] It can be seen that the torque transmission route of the first stroke is as follows: the rocker gear 4, the first power output component 6a' and the coupling gear 8 transmit power in sequence.

[0080] During the second stroke, when the second cylinder is working, the push rod drives the rocker gear 4 and gear D to rotate counterclockwise. Gear D drives gear E to rotate clockwise. The second one-way clutch 5b is locked. Gear E drives the second power output component 6b to rotate clockwise through the second one-way clutch 5b. The second gear 64 of the second power output component 6b drives the coupling gear 8 to rotate counterclockwise and transmits power. At the same time, the first one-way clutch 5a is disengaged. Since the first power output component 6a' can rotate freely without restraint, the coupling gear 8 drives the first power output component 6a' to rotate clockwise freely.

[0081] As can be seen, the torque transmission route of the second stroke is as follows: the rocker gear 4, gear D, gear E, second power output component 6b and coupling gear 8 transmit power in sequence.

[0082] During the first stroke, the coupling gear 8 is driven to rotate counterclockwise; during the second stroke, the coupling gear 8 is still driven to rotate counterclockwise. That is, the coupling gear 8 is continuously driven to rotate counterclockwise, with its rotation direction remaining unchanged or its power output direction remaining unchanged, thus coupling the power of the two power output components. Through the coupling connection of the coupling gear 8, any shaft and gear downstream of the two one-way clutches, the first power output component 6a', the second power output component 6b, and the coupling gear 8 can all serve as the main output shaft, ensuring their respective rotation directions and continuously outputting power.

[0083] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A two-stroke free-piston engine, comprising two opposing cylinders, characterized in that: It also includes a transmission unit; The transmission unit includes a rocker gear, a first one-way clutch, a second one-way clutch, a first power output component, and a second power output component. The rocker gear is connected to the first output component through the first one-way clutch, and the rocker gear is connected to the second output component through the second one-way clutch. The pistons of the two cylinders are connected by a push rod, the rocker gear meshes with the rack on the push rod, and the rocker gear is configured to rotate around a fixed axis. Each reciprocating linear motion of the piston corresponds to the first and second strokes in sequence, forming a working cycle; during the engine's cyclic operation, the piston pushes the push rod to perform a reciprocating linear motion together. In the first stroke, the push rod drives the rocker gear to rotate in the first direction through the rack. The rocker gear is connected to the first power output component through the first one-way clutch to ensure that the first power output component transmits torque. At the same time, the second one-way clutch is disengaged to ensure that the second power output component rotates in the same direction as the rotation direction of the previous stroke. In the second stroke, the push rod drives the rocker gear to rotate in a second direction opposite to the first direction via the rack. The rocker gear is connected to the second power output component via the second one-way clutch to ensure that the second power output component transmits torque, and simultaneously the first one-way clutch disengages so that the first power output component rotates in the same direction as the rotation direction of the previous stroke. The first power output component and the second power output component alternately transmit and output engine torque, and their respective rotation directions remain unchanged.

2. The two-stroke free piston engine according to claim 1, characterized in that: The transmission unit also includes a coupling mechanism, through which the first power output component and the second power output component are connected, coupling the power output alternately from the two power output components into a single, continuous power output, and the direction of rotation remains unchanged.

3. The two-stroke free piston engine according to claim 1, characterized in that: The rocker gear is directly driven to the first power output component via the first one-way clutch, and the rocker gear is directly driven to the second power output component via the second one-way clutch.

4. The two-stroke free piston engine according to claim 3, characterized in that: The first power output component and the second power output component are respectively an output shaft or an output wheel for outputting torque.

5. The two-stroke free piston engine according to claim 2, characterized in that: The rocker gear and / or the first power output component and / or the second power output component are connected by the coupling mechanism to couple the power output of every two consecutive strokes and ensure continuous power output, while the power output direction remains unchanged.

6. The two-stroke free piston engine according to claim 5, characterized in that: The coupling mechanism includes a coupling gear and a first output gear and a second output gear arranged coaxially. The first power output component includes a first output shaft lockably connected to the first one-way clutch and a first gear fixed to the first output shaft. The second power output component includes a second output shaft lockably connected to the second one-way clutch and a second gear fixed to the second output shaft. The first output gear is driven to connect to the first gear through the coupling gear, and the second output gear meshes with the second gear.

7. The two-stroke free piston engine according to claim 5, characterized in that: The coupling mechanism includes a coupling gear and a first output gear and a second output gear arranged coaxially. Both the first power output component and the second power output component are gears. A first one-way clutch is provided between the shaft of the first power output component and the shaft of the rocker gear, and a second one-way clutch is provided between the shaft of the second power output component and the shaft of the rocker gear. The first output gear is driven to connect to the first power output component through the coupling gear, and the second output gear is engaged with the second power output component.

8. The two-stroke free piston engine according to claim 5, characterized in that: The coupling mechanism includes a transmission gear set, the shaft of the rocker gear is fixedly connected to the transmission gear set, the transmission gear set is driven to the first power output component through the first one-way clutch, and is driven to the second power output component through the second one-way clutch, thereby forming an indirect drive configuration.

9. The two-stroke free piston engine according to claim 8, characterized in that: The first power output component includes a first output shaft lockably connected to the first one-way clutch and a first gear fixed to the first output shaft; the second power output component includes a second output shaft lockably connected to the second one-way clutch and a second gear fixed to the second output shaft, wherein the first gear and the second gear mesh.

10. The two-stroke free piston engine according to claim 5, characterized in that: The coupling mechanism includes a coupling gear and a transmission gear set. The shaft of the rocking gear is fixedly connected to the transmission gear set. The first power output component is a gear. The shaft of the rocking gear is directly driven to the first power output component through the first one-way clutch. The second power output component includes a second output shaft lockably connected to the second one-way clutch and a second gear fixed to the second output shaft. The transmission gear set is driven to the second output shaft through the second one-way clutch. The first power output component is driven to the second gear through the coupling gear.

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