Engine

Abstract

The invention discloses an engine, and belongs to the technical field of engines, the engine comprises a box body, a crankshaft system, a speed change system and a transmission shaft are arranged in the box body, the crankshaft system comprises a balance shaft assembly, and the balance shaft assembly comprises a first balance shaft and a second balance shaft; the first balance shaft and the second balance shaft are symmetrically arranged on the two sides of the crankshaft system. The transmission shaft is arranged below the crankshaft system and the transmission system and is in transmission connection with the transmission system; a driving device is arranged outside the box body, and the first balance shaft is arranged below the driving device. According to the scheme, the crankshaft system, the speed control system and the transmission shaft are all arranged in the box body, the crankshaft system and the speed control system are communicated and adjacently arranged, and the transmission shaft is arranged below the speed control system and the crankshaft system, so that the structures of the crankshaft system, the speed control system and the crankshaft system are compactly arranged.

Description

Technical Field

[0001] The present invention relates to a power device, and more specifically, to an engine. Background Technology

[0002] As one of the core components of a vehicle, the engine generates power to start the vehicle. With technological advancements in engines, their internal structures and layouts have become increasingly complex and diverse. Existing engines are often large, inconvenient to install, and costly to design. Therefore, optimizing the internal structure of the engine to improve its overall performance is a primary means of reducing costs and increasing efficiency.

[0003] For example, Chinese Patent Publication No. CN219176893U, published on June 13, 2023, is entitled "An Installation Structure for a Motorcycle Engine Transmission System." It includes an engine mounted on a frame, comprising a crankcase and a transmission box and gearbox located on either side of the crankcase. A crankshaft is rotatably mounted in the crankcase, and a continuously variable transmission (CVT) is mounted in the gearbox. The transmission box is located on the left side of the frame, and the gearbox is located on the right side. The CVT includes a drive wheel and a transmission wheel, which are connected by a transmission belt. One end of the crankshaft extends to the gearbox and is synchronously fitted with the drive wheel. A transmission shaft and a power output shaft, both parallel to the crankshaft, are rotatably mounted in the gearbox. The transmission wheel is synchronously fitted on the transmission shaft. The transmission shaft transmits power to the power output shaft via a reduction assembly. The left end of the power output shaft extends outward from the gearbox and transmits power to the rear wheel of the motorcycle via a sprocket and chain drive mechanism, thereby shortening the distance between the drive wheel and the transmission wheel in the CVT. Although this solution shortens the distance between the power wheel and the transmission wheel in the continuously variable transmission (CVT), the internal structure of the engine occupies a large space, the engine is large in size, and the engine's stability is poor. Summary of the Invention

[0004] This invention overcomes the problems of complex internal structure and large size of existing engines, and provides an engine solution that rationally arranges the internal structure of the engine, making the internal structure of the engine compact, while effectively improving the stability and performance of the engine.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an engine, including a housing, wherein a crankshaft system, a transmission system, and a drive shaft are disposed within the housing. The crankshaft system includes a balance shaft assembly, which includes a first balance shaft and a second balance shaft, the first balance shaft and the second balance shaft being arranged on both sides of the crankshaft system; the transmission system is arranged adjacent to the crankshaft system, and the drive shaft is located below the crankshaft system and the transmission system and is connected to the transmission system for transmission; a drive device is disposed outside the housing, and the first balance shaft is located below the drive device. This solution arranges the crankshaft system, transmission system, and drive shaft all inside the housing, with the crankshaft system and transmission system connected and arranged adjacently. The drive shaft is located below the transmission system and crankshaft system, making the three components compact. Simultaneously, the balance shaft assembly can balance the crankshaft system, effectively reducing vibration inside the housing, thereby improving the motion stability of the transmission system and the drive shaft, and enhancing engine performance.

[0006] Preferably, the crankshaft system further includes a crank and a first shaft assembly rotatably connected to the crank. The first shaft assembly includes a first shaft and a second shaft, with a first balance block respectively mounted on the first shaft and the second shaft. The crank is eccentrically rotatably connected to the first balance block. The crank is eccentrically connected to the first balance block via a leaf spring, enabling it to continuously drive the first shaft assembly to rotate, thereby driving the transmission system to move.

[0007] Preferably, the first balance shaft and the second balance shaft are provided with second balance blocks that balance the first balance block; the balance shaft assembly meshes with the gears of the first shaft group. The balance shaft assembly is driven by the rotation of the first shaft group, and the second balance blocks on the first and second balance shafts can balance with the first balance block on the first shaft group, thereby reducing the vibration of the crankshaft system.

[0008] Preferably, a starting assembly is also drivenly connected to the first shaft assembly. The starting assembly includes a drive device and a flywheel assembly. The flywheel assembly is coaxially connected to the first shaft assembly, and the drive device is drivenly connected to the flywheel assembly. The drive device is used to start the flywheel assembly, thereby starting the crankshaft system through the rotation of the flywheel assembly.

[0009] Preferably, the end of the first shaft assembly furthest from the starting component is connected to a transmission system. The transmission system includes a drive wheel assembly and a gear set. The drive wheel assembly includes a driving wheel and a driven wheel. The driving wheel is driven by the first shaft assembly, and the driven wheel is driven by the gear set. The drive wheel assembly connects the gear set and the crankshaft system, transmitting the power output from the crankshaft system to the gear set, and ultimately outputting power through the drive shaft.

[0010] Preferably, the transmission gear set includes an output shaft, which is drivingly connected to the drive shaft. The transmission gear set transmits power to the drive shaft via the output shaft, and the drive shaft completes the final power output of the engine.

[0011] Preferably, the flywheel assembly includes a flywheel and a starting gear, with a recess in the center of the starting gear to accommodate the flywheel. The recess on the starting gear can reduce the overall axial dimension of the flywheel assembly to a certain extent, making the arrangement between the flywheel assembly and the housing more compact.

[0012] Preferably, the drive unit is located outside the housing and on the side of the crank input end. Arranging the drive unit on the outside of the housing saves internal space.

[0013] Preferably, the housing includes a first housing and a second housing, which are detachably connected. The flywheel assembly is located on the side of the first housing away from the crankshaft system, and the drive wheel assembly is located on the side of the second housing away from the crankshaft system. The first housing and the second housing are detachably connected, and the flywheel assembly and the drive wheel assembly are respectively arranged on both sides of the housing, resulting in a reasonable layout.

[0014] Preferably, the first housing has an oil passage on the side near the flywheel assembly, the oil passage connecting to the shaft end of the transmission gear set. The oil passage on the first housing connects to the shaft end of the transmission gear set, serving to lubricate the gear shaft.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) The crankshaft system, transmission system and drive shaft are reasonably arranged in this solution, making the internal structure of the engine more compact and further reducing the overall volume of the engine; (2) The transmission stability of the crankshaft system, transmission system and drive shaft in the engine is further improved, reducing engine vibration, effectively reducing wear of the internal structure of the engine, and improving the service life of the engine; (3) It has a good heat dissipation and ventilation structure, avoiding the performance degradation of the transmission system and crankshaft system in the housing due to high temperature environment; and improving the overall performance of the engine. Attached Figure Description

[0016] Figure 1 This is an isometric view of the present invention.

[0017] Figure 2 This is an isometric view of the invention from another perspective.

[0018] Figure 3 This is a schematic diagram of the structure of the startup component of the present invention.

[0019] Figure 4 This is a schematic diagram of the startup component of the present invention from another perspective.

[0020] Figure 5 This is a structural schematic diagram of one side of the first housing assembly of the present invention, showing the flywheel assembly.

[0021] Figure 6 This is a structural schematic diagram of one side of the crankshaft system assembled in the first housing of the present invention.

[0022] Figure 7 This is a schematic diagram of the internal structure arrangement of the second housing of the present invention.

[0023] Figure 8 This is a schematic diagram of the internal structure arrangement of the first box of the present invention.

[0024] Figure 9 This is a schematic diagram of the structure of one side of the crankshaft system assembled in the second housing of the present invention.

[0025] Figure 10 for Figure 7 A cross-sectional view along the AA direction.

[0026] Figure 11 This is a schematic diagram of the crankshaft system of the present invention.

[0027] Figure 12 This is a schematic diagram showing the connection between the speed-changing gear set and the drive shaft of the present invention.

[0028] Figure 13 This is a schematic diagram showing the connection between the output shaft and the transmission shaft in the variable speed gear set of the present invention.

[0029] In the diagram: 1. Housing, 1.1. First Housing, 1.2. Second Housing, 2. Crankshaft System, 2.1. First Balance Shaft, 2.2. Second Balance Shaft, 2.3. Crank, 2.4. Shaft 1, 2.5. Shaft 2, 2.6. First Balance Block, 2.7. Second Balance Block, 2.8. Balance Gear, 2.9. Transmission Gear, 3. Transmission System, 3.1. Transmission Gear Set, 3.11. Driving Gear, 3.12. Driven Gear, 3.13. Transmission Belt, 3.2. Transmission Gear Set, 3.21. Output Shaft, 4. Transmission Shaft, 5. Starting Assembly, 5.1. Drive Unit, 5.2. Fly 5.21. Flywheel assembly, 5.22. Starter gear, 5.221. Recess, 5.3. Drive pinion, 5.4. Intermediate gear, 5.5. Flywheel shaft, 5.6. Limiting plate, 5.7. Protrusion, 6.1. First oil passage, 6.11. Oil groove, 6.12. First oil passage outlet, 6.2. Second oil passage, 6.21. Second oil passage inlet, 7. Arc groove, 8. Crankshaft bore, 9. Piston, 10.1. First bearing housing, 10.2. Second bearing housing, 10.3. Third bearing housing, 11. Fixed seat, 12. Divider plate, 13. Through port, 14. Ventilation hole. Detailed Implementation

[0030] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0031] Example: Figures 1 to 13 An engine, as shown, includes a crankshaft system 2, a transmission system 3, and a driveshaft 4. The crankshaft system 2 and the transmission system 3 are arranged adjacently within an engine housing 1. The driveshaft 4 is located inside the housing 1, below the crankshaft system 2 and the transmission system 3, and is connected to the transmission system 3. The crankshaft system 2 includes a balance shaft assembly, a crank 2.3, and a first shaft assembly. The crank 2.3 is eccentrically rotatably connected to the first shaft assembly and drives the first shaft assembly to rotate. The balance shaft assembly effectively balances the vibrations generated during the movement of the crankshaft system 2, thereby reducing engine vibration. The crankshaft system 2, the transmission system 3, and the driveshaft 4 are arranged in a reasonable and compact manner, significantly reducing the overall size of the engine. Simultaneously, the balance shaft assembly within the crankshaft system 2 greatly reduces engine vibration, making the internal structure of the housing 1 more stable. This also promotes the stable operation of the transmission system 3 and the driveshaft 4, reduces wear on the internal structure of the engine, and improves the engine's service life.

[0032] Specifically, housing 1 includes a first housing 1.1 and a second housing 1.2. Both sides of the first housing 1.1 and both sides of the second housing 1.2 can accommodate and install structures. The first housing 1.1 and the second housing 1.2 are detachably connected by bolts. After assembly, the first housing 1.1 and the second housing 1.2 form an internal cavity to accommodate structures such as the crankshaft system 2, the transmission system 3, and the drive shaft 4. On the side of the first housing 1.1 away from the second housing 1.2, a starting assembly 5 is arranged, connected to one end of the crankshaft system 2. On the side of the second housing 1.2 away from the first housing 1.1, a transmission wheel set 3.1 from the transmission system 3 is arranged, connected to the other end of the crankshaft system 2. After the starting assembly 5 starts the crankshaft system 2, the crankshaft system 2 continues to move, which in turn drives the transmission wheel set 3.1, ultimately driving the drive shaft 4 to output power.

[0033] Furthermore, such as Figure 1 , Figure 3 and Figure 4As shown, the starting assembly 5 includes a drive unit 5.1 and a flywheel assembly 5.2. The drive unit 5.1 is arranged on the outside of the housing 1. Specifically, an arc-shaped groove 7 for accommodating the drive unit 5.1 is provided on the outside of the first housing 1.1 and the second housing 1.2. The drive unit 5.1 is a rotary motor. The drive unit 5.1 is arranged on the side of the crankshaft system 2 that connects to the piston cylinder. After the drive unit 5.1 is arranged, the outside of the drive unit 5.1 is almost flush with the surface of the housing 1, making the housing 1 relatively flat as a whole, avoiding the drive unit 5.1 from protruding outside the housing 1, thereby reducing the overall size of the engine. The output end of the drive device 5.1 is equipped with a drive pinion 5.3. The flywheel assembly 5.2 includes a flywheel 5.21 and a starting gear 5.22. The drive pinion 5.3 and the flywheel 5.21 are meshed through an intermediate gear 5.4. The radius of the drive pinion 5.3 is smaller than the radius of the intermediate gear 5.4, and the radius of the intermediate gear 5.4 is smaller than the radius of the starting gear 5.22. Thus, a reduction gear set is formed between the drive pinion 5.3 and the starting gear 5.22. The drive device 5.1 can output a larger torque through the drive pinion 5.3 and drive the starting gear 5.22 to rotate. After the starting gear 5.22 rotates, it can further drive the flywheel 5.21 to rotate. Since the flywheel 5.21 itself has a large weight, it has a large inertial force when it rotates. The flywheel 5.21 is mounted on the flywheel shaft 5.5, which is rotatably connected to the first housing 1.1 and connected to the shaft on the crankshaft system 2. Thus, when the flywheel 5.21 rotates, it can drive the crankshaft system 2 to move.

[0034] It should be noted that the starting gear 5.22 has a gear carrier structure. The outer ring of the starting gear 5.22 has a tooth structure for meshing with the intermediate gear 5.4. The inner ring of the starting gear 5.22 has a concave radial support structure forming a recess 5.221. The recess 5.221 is located on the side of the starting gear 5.22 away from the first housing 1.1. The radial dimension of the flywheel 5.21 matches the radial dimension of the recess 5.221, and the flywheel 5.21 is arranged to a certain extent close to the recess 5.221. Thus, part of the flywheel 5.21 is located within the recess 5.221, which reduces the overall axial dimension of the flywheel assembly 5.2, making the structure of the flywheel assembly 5.2 more compact. The support structure of the inner ring of the starting gear 5.22 also facilitates the heat dissipation of the flywheel assembly 5.2, reducing the internal temperature of the engine. Furthermore, the location of the drive unit 5.1 on the outside of the housing 1 also facilitates the heat dissipation of the drive unit 5.1, preventing excessive heat generation inside the housing 1. It should also be noted that after the drive device 5.1 is started, it drives the intermediate gear 5.4 to rotate, which in turn drives the starting gear 5.22 to rotate. When the starting gear 5.22 rotates, it can drive the flywheel 5.21 to rotate. The flywheel 5.21 continues to rotate under its own inertial force, and then the drive device 5.1 can stop working.

[0035] Furthermore, a limiting plate 5.6 is provided in the cavity of the first housing 1.1 where the flywheel assembly 5.2 is located. The limiting plate 5.6 is located on the side of the starter gear 5.22 away from the first housing 1.1. Specifically, a protruding post 5.7 structure is arranged inside the first housing 1.1. The protruding post 5.7 not only improves the structural strength of the inner wall of the first housing 1.1, but also provides installation space for the limiting plate 5.6. When the starter gear 5.22 rotates, it inevitably moves axially along the flywheel shaft 5.5. The limiting plate 5.6 is located on the side of the starter gear 5.22 away from the first housing 1.1, and one end of the limiting plate 5.6 is fixedly connected to the protruding post 5.7, while the other end extends to the inner radius of the starter gear 5.22. When the starter gear 5.22 moves axially, the displacement can be effectively limited by the limiting plate 5.6, ensuring that the starter gear 5.22 always meshes with the intermediate gear 5.4.

[0036] Furthermore, between the first housing 1.1 and the second housing 1.2, corresponding to the flywheel assembly 5.2, lies the crankshaft system 2. The crankshaft system 2 includes a crank 2.3, a first shaft assembly, and a balance shaft assembly. On the upper side of the housing 1 is a crankshaft bore 8, formed by the first housing 1.1 and the second housing 1.2. The crankshaft bore 8 is used to connect the piston 9 and the first shaft assembly. Specifically, the first shaft assembly includes shaft one 2.4 and shaft two 2.5, as shown... Figure 7 , Figure 8 , Figure 10 and Figure 11 As shown, shaft 1 2.4 is a shaft rotatably connected to the first housing 1.1, shaft 2 2.5 is a shaft rotatably connected to the second housing 1.2, and a crank 2.3 structure is eccentrically connected between shaft 1 2.4 and shaft 2 2.5. Crank 2.3 connects shaft 2.4 and shaft 2.5 together, enabling them to rotate synchronously. A first balance block 2.6 is provided on the side of shaft 2.4 and shaft 2.5 that are close to each other. That is, a first balance block 2.6 is provided on both shaft 2.4 and shaft 2.5. The first balance block 2.6 is eccentrically arranged on shaft 2.4 and shaft 2.5. At the same time, one end of crank 2.3 is also eccentrically connected to the first balance block 2.6. Thus, when the first shaft assembly (or shaft 2.4 and shaft 2.5) rotates, it will drive crank 2.3 to reciprocate in a cyclical manner, so that the piston 9 on the other side of crank 2.3 can reciprocate in the piston cylinder of the engine, thereby ensuring the continuous movement of the first shaft assembly. The end of shaft 2.5 away from shaft 1.4 extends to the side of the second housing 1.2 away from the first housing 1.1 and is connected to the transmission system 3. That is, when the first shaft group rotates, it can drive the transmission system 3 to move and output power to the transmission shaft 4.

[0037] Furthermore, a balance shaft assembly is also provided inside the housing 1. The balance shaft assembly includes a first balance shaft 2.1 and a second balance shaft 2.2, which are respectively arranged on both sides of the first shaft group (or shaft one 2.4 and shaft two 2.5). The first balance shaft 2.1, the second balance shaft 2.2, and shaft one 2.4 and shaft two 2.5 on the first shaft group are all arranged in parallel. A second balance block 2.7 is arranged on the first balance shaft 2.1 and the second balance shaft 2.2, and the second balance block 2.7 is in the opposite position to the first balance block 2.6. In addition, a balance gear 2.8 is provided at the end of shaft 2.5 near shaft 1 2.4, and a transmission gear 2.9 is provided on the first balance shaft 2.1 and the second balance shaft 2.2 respectively. The balance gear 2.8 and the transmission gear 2.9 have the same radius. When the first shaft group rotates, it can also drive the balance gear 2.8 to rotate synchronously, thereby driving the transmission gear 2.9 on the first balance shaft 2.1 and the second balance shaft 2.2 to rotate, that is, realizing the rotation of the first balance shaft 2.1 and the second balance shaft 2.2. Since the positions of the first balance blocks 2.6 on shaft 1 2.4 and shaft 2 2.5 are opposite to the positions of the second balance blocks 2.7 on the first balance shaft 2.1 and the second balance shaft 2.2, when the crank 2.3 drives shaft 1 2.4 and shaft 2 2.5 to rotate, the first balance blocks 2.6 on shaft 1 2.4 and shaft 2 2.5 generate inertial forces, while the second balance blocks 2.7 on the first balance shaft 2.1 and the second balance shaft 2.2 can generate opposite inertial forces. In other words, the inertial forces generated by the first balance blocks 2.6 and the second balance blocks 2.7 cancel each other out, thereby ensuring that the first shaft assembly can operate stably, reducing the vibration generated when the crankshaft system 2 is working, and thus reducing the vibration impact of the engine.

[0038] It should be noted that the first balance shaft 2.1 is located between the transmission system 3 and the crankshaft system 2. The first balance shaft 2.1 and the second balance shaft 2.2 are arranged close to the outer diameter of the first balance block 2.6. The second balance block 2.7 on the first balance shaft 2.1 and the second balance shaft 2.2 can enter between the two first balance blocks 2.6 of shaft 1 2.4 and shaft 2 2.5. Through a specific phase, the second balance block 2.7 will not collide with the crank 2.3. This makes the overall structure of the crankshaft system 2 compact. Furthermore, the balance shaft assembly has the effect of improving the smoothness of the crankshaft system 2, so that the adjacent arrangement of the transmission system 3 and the crankshaft system 2 can also improve the operating stability of the transmission system 3. Furthermore, the transmission system 3 includes a transmission wheel set 3.1 and a transmission gear set 3.2. The transmission wheel set 3.1 is arranged on the side of the second housing 1.2 away from the first housing 1.1, that is, outside the cavity formed by the first housing 1.1 and the second housing 1.2. The transmission gear set 3.2 is arranged between the first housing 1.1 and the second housing 1.2, that is, inside the cavity formed by the first housing 1.1 and the second housing 1.2. The first balance shaft 2.1 is arranged between the first shaft set and the transmission gear set 3.2, thereby improving the stability of the transmission gear set 3.2 during operation. The compact structure between the transmission gear set 3.2 and the crankshaft system 2 effectively reduces the volume of the first housing 1.1 and the second housing 1.2.

[0039] On the second housing 1.2, shaft 2.5 passes through the second housing 1.2, and the end of shaft 2.5 away from shaft 2.4 is connected to the transmission wheel set 3.1. Specifically, as follows... Figure 1 and Figure 10As shown, the transmission wheel assembly 3.1 includes a driving wheel 3.11 and a driven wheel 3.12. The radius of the driving wheel 3.11 is smaller than the radius of the driven wheel 3.12. The driving wheel 3.11 and the driven wheel 3.12 are connected by a transmission belt 3.13. The driving wheel 3.11 is rotatably connected to shaft 2.5. The rotation of shaft 2.5 drives the driving wheel 3.11 to rotate, which in turn drives the driven wheel 3.12 to rotate via the transmission belt 3.13. It should be noted that both the driving wheel 3.11 and the driven wheel 3.12 consist of two sets of conical wheels, which are arranged opposite each other and form a transmission groove between them. The distance between the two sets of conical wheels on the driving wheel 3.11 and the driven wheel 3.12 can be adjusted, thereby changing the width of the transmission groove. The transmission belt 3.13 is located within the transmission groove on the driving wheel 3.11 and the driven wheel 3.12. That is, the transmission radius of the transmission belt 3.13 changes with the change in the width of the transmission groove on the driving wheel 3.11 and the driven wheel 3.12. When the distance between the conical wheels decreases, the width of the transmission groove decreases, and the transmission radius of the transmission belt 3.13 increases. When the distance between the conical wheels increases, the width of the transmission groove increases, and the transmission radius of the transmission belt 3.13 decreases accordingly. The transmission belt 3.13 is a steel belt structure, which can withstand the axial pressure between the two conical wheels and drive the driving wheel 3.11 and the driven wheel 3.12 to rotate. The distance between the cone wheels can be continuously adjusted through shaft 2.5 and the adjustment component sleeved outside shaft 2.5, which realizes the stepless adjustment of the transmission wheel set 3.1 and can continuously change the transmission ratio of the transmission wheel set 3.1. This adjustment method is a conventional adjustment method and will not be described in detail here.

[0040] Furthermore, the transmission gear set 3.2 includes several sets of gear shafts. Through the meshing of gears on these shafts, the transmission gear set 3.2 achieves gear shifting, thereby changing the engine's gear position. The structure and connections of the transmission gear set 3.2 are all conventional technologies and will not be elaborated upon here. The output shaft 3.21 of the transmission gear set 3.2 is connected to the drive shaft 4, and the output shaft 3.21 and drive shaft 4 are perpendicular to each other. The output shaft 3.21 and drive shaft 4 are connected by bevel gear meshing. The drive shaft 4 is positioned below the transmission gear set 3.2 and crankshaft system 2. This arrangement allows the drive shaft 4 to connect to the output shaft 3.21 of the transmission gear set 3.2 without obstructing the crankshaft movement of the crankshaft system 2, resulting in a reasonable layout and a more compact structure.

[0041] It should be noted that three sets of bearing housings are provided between the first housing 1.1 and the second housing 1.2 for mounting the drive shaft 4. From the crankshaft system 2 to the transmission gear set 3.2, they are the first bearing housing 10.1, the second bearing housing 10.2, and the third bearing housing 10.3, respectively. The second bearing housing 10.2 effectively separates the transmission gear set 3.2 and the crankshaft system 2. That is, the distance between the first bearing housing 10.1 and the second bearing housing 10.2 is adapted to the radial dimension of the transmission system 3, and the distance between the second bearing housing 10.2 and the third bearing housing 10.3 is adapted. In other words, the length of the drive shaft 4 is adapted to the overall length dimension of the transmission gear set 3.2 and the crankshaft system 2. A fixed seat 11 is provided between the second bearing housing 10.2 and the third bearing housing 10.3. That is, a fixed seat 11 is provided on the transmission shaft 4 and at the position corresponding to the speed-changing gear set 3.2. The fixed seat 11 is generally U-shaped or groove-shaped. The transmission shaft 4 is located inside the fixed seat 11. The outer side of the groove bottom of the fixed seat 11 faces the direction of the speed-changing gear set 3.2, and the inner side of the groove bottom of the fixed seat 11 faces the direction of the first housing 1.1. An output bearing housing is arranged at the bottom of the groove of the fixed seat 11. The output shaft 3.21 of the speed-changing gear set 3.2 is rotatably connected to the output bearing housing. The end of the fixed seat 11 away from the bottom of the groove is fixedly connected to the first housing 1.1 by bolts or other connecting parts. This ensures that the speed-changing gear set 3.2 can effectively output power without hindering the power output of the transmission shaft 4. Furthermore, the bevel gear between the transmission shaft 4 and the output shaft 3.21 can be effectively arranged and meshed to achieve power transmission. The bevel gears on the output shaft 3.21 and the drive shaft 4 mesh between the third bearing housing 10.3 and the second bearing housing 10.2, and are close to the second bearing housing 10.2, to improve the stability of the drive shaft 4's movement. Furthermore, the radial dimension of the bevel gear matches the radial dimension of the bearing on the second bearing housing 10.2 to minimize the size of the bevel gear and improve the compactness of the internal structure of the housing 1. The drive shaft 4 extends to both ends and then to the outside of the housing 1, enabling the output of engine power.

[0042] It should be noted that the transmission gear set 3.2 is directly connected to the drive shaft 4, so there is no need to set up a partition or other structure. The crankshaft system 2 is also not directly connected to the transmission gear set 3.2, but there is no partition between them. That is, the crankshaft system 2 and the transmission gear set 3.2 are connected. The crankshaft system 2 and the drive shaft 4 are not directly connected. A partition plate 12 is set between the crankshaft system 2 and the drive shaft 4 to avoid mutual interference between the drive shaft 4 and the crankshaft system 2. The partition plate 12 is located on the first housing 1.1 and the second housing 1.2. After the first housing 1.1 and the second housing 1.2 are assembled, the crankshaft system 2 and the drive shaft 4 can be effectively separated. It should be noted that a through-hole 13 is provided on the partition plate 12 near the second bearing housing 10.2. The through-hole 13 connects the chamber where the transmission shaft 4 is located with the chamber where the crankshaft system 2 is located. That is, the chambers where the transmission gear set 3.2 and the crankshaft system 2 are located are connected with the chamber where the transmission shaft 4 is located. When the three are working, the heat generated during operation can flow inside. There is no direct connection between the transmission gear set 3.2 and the first housing 1.1. Therefore, the first housing 1.1, corresponding to the position of the transmission gear set 3.2, has a completely closed cavity wall structure. Corresponding to the position of the crankshaft system 2, a flywheel assembly 5.2 connected to the crankshaft system 3 is arranged on the side of the first housing 1.1 away from the second housing 1.2. Therefore, several ventilation holes 14 are provided on the cavity wall of the first housing 1.1 corresponding to the crankshaft system 2. Thus, the opening 13 structure on the partition plate 12 plays an important role in the heat dissipation of the transmission gear set 3.2, effectively preventing the internal temperature of the crankshaft system 2 and the transmission gear set 3.2 from becoming too high and reducing the performance of the engine.

[0043] Furthermore, a number of ventilation holes 14 are arranged on the first housing 1.1 corresponding to the location of the crankshaft system 2. Two sets of ventilation holes 14 are located at the ends of the first balance shaft 2.1 and the second balance shaft 2.2, respectively. The size of the ventilation holes 14 is smaller than the size of the bearings on the first balance shaft 2.1 and the second balance shaft 2.2. While ensuring the stable installation of the first balance shaft 2.1 and the second balance shaft 2.2, the ventilation holes 14 also effectively dissipate heat from the bearings of the first balance shaft 2.1 and the second balance shaft 2.2. Another set of ventilation holes 14 is arranged on the first housing 1.1 near the crank 2.3 to dissipate heat generated at the end of the crank 2.3. Finally, at least three sets of ventilation holes 14 are arranged on the first housing 1.1 near the chamber where the drive shaft 4 is located, to achieve effective heat dissipation from the entire chamber formed inside the first housing 1.1 and the second housing 1.2.

[0044] An oil passage structure is also provided on the first housing 1.1. The oil passage is arranged in the cavity where the flywheel assembly 5.2 is installed in the first housing 1.1, and the oil passage structure includes a first oil passage 6.1 and a second oil passage 6.2. Specifically, an oil groove 6.11 is provided on the side of the first housing 1.1 away from the second housing 1.2. The oil groove 6.11 is arranged close to the side wall of the first housing 1.1 and near the second bearing seat 10.2. An oil inlet is provided in the oil groove 6.11, forming the first oil passage 6.1 inside the first housing 1.1. The first oil passage outlet 6.12 is located on the bearing mounting seat of the transmission gear set 3.2, connecting all the mounting seats of the transmission gear set 3.2 through a bearing mounting seat. The first oil passage 6.1 is arranged from bottom to top along the oil passage direction to ensure that all the shafts of the transmission gear set 3.2 are lubricated with oil. Additionally, a second oil passage 6.2 is provided inside the first housing 1.1 and at the location corresponding to the drive shaft 4 near the first bearing seat 10.1. The oil inlet 6.21 of the second oil passage is also arranged in the chamber where the flywheel assembly 5.2 is located in the first housing 1.1. The second oil passage 6.2 can deliver oil to the chamber where the drive shaft 4 is located, and effectively lubricate the drive shaft 4.

Claims

1. An engine, characterized in that, Includes a housing, and the housing contains... A crankshaft system, including a balance shaft assembly, the balance shaft assembly including a first balance shaft and a second balance shaft, the first balance shaft and the second balance shaft being arranged on both sides of the crankshaft system; The transmission system is arranged adjacent to the crankshaft system; A drive shaft is located below the crankshaft system and the transmission system and is connected to the transmission system in a transmission manner. The housing is equipped with a drive device, and the first balance shaft is located below the drive device.

2. An engine according to claim 1, characterized in that, The crankshaft system further includes a crank and a first shaft assembly rotatably connected to the crank. The first shaft assembly includes a first shaft and a second shaft. A first balance block is provided on the first shaft and the second shaft respectively. The crank is eccentrically rotatably connected to the first balance block.

3. An engine according to claim 2, characterized in that, The first balance shaft and the second balance shaft are provided with a second balance block that is mutually balanced with the first balance block; the balance shaft assembly and the first shaft group are driven by gear meshing.

4. An engine according to claim 2, characterized in that, The first shaft group is also connected to a starting component, which includes the drive device and a flywheel assembly. The flywheel assembly is coaxially connected to the first shaft group, and the drive device is connected to the flywheel assembly in a driving manner.

5. An engine according to claim 4, characterized in that, The end of the first shaft assembly away from the starting component is connected to a transmission system. The transmission system includes a transmission wheel assembly and a transmission gear assembly. The transmission wheel assembly includes a driving wheel and a driven wheel. The driving wheel is drivenly connected to the first shaft assembly, and the driven wheel is drivenly connected to the transmission gear assembly.

6. An engine according to claim 5, characterized in that, The speed-changing gear set includes an output shaft, which is connected to the drive shaft.

7. An engine according to claim 4, characterized in that, The flywheel assembly includes a flywheel and a starting gear, and the starting gear has a recess in the middle to accommodate the flywheel.

8. An engine according to any one of claims 4 to 7, characterized in that, The drive unit is located outside the housing and on the side of the crank input end.

9. An engine according to claim 5 or 6, characterized in that, The housing includes a first housing and a second housing, the first housing and the second housing are detachably connected, the flywheel assembly is located on the side of the first housing away from the crankshaft system, and the transmission wheel assembly is located on the side of the second housing away from the crankshaft system.

10. An engine according to claim 9, characterized in that, The first housing has an oil passage on the side near the flywheel assembly, and the oil passage is connected to the shaft end of the transmission gear set.

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