A frame-type crankcase

Abstract

The application discloses a frame type crankcase and belongs to the technical field of engines, which comprises a first body and a second body connected in opposition, a crankcase cover covering the first body and the second body, and a generator shell formed by the first body and the second body connected in opposition. The first body and the second body are connected in opposition to form the generator shell, the first frame plate and the fourth frame plate are connected in opposition, the third frame plate and the sixth frame plate are connected in opposition, and the crankshaft is supported. The frame type crankcase is formed by the first body and the second body connected in opposition, the split type structure is beneficial to the installation and dismounting of internal components, the frame type structure optimizes the supporting performance of the crankcase, improves the bearing capacity and durability of the whole system, reduces the weight and manufacturing cost of the crankcase on the basis of providing sufficient rigidity and strength, and realizes the lightweight design of the crankcase, which has great significance for energy saving and emission reduction.

Description

Technical Field

[0001] This invention belongs to the field of engine technology, specifically a frame-type crankcase. Background Technology

[0002] The crankcase is a core component of a car engine, providing a mounting base for moving parts such as the crankshaft, connecting rods, and camshaft. It needs to possess sufficient rigidity and strength to prevent deformation. The moving parts within the crankcase typically operate at high speeds, and the various friction surfaces in contact with the crankcase require proper lubrication. The crankcase usually includes an oil pan as an oil storage container. To guide the flow of lubricating oil, reduce friction, and extend its service life, the crankcase typically also has multiple lubrication passages. This results in existing crankcases often having a complex structure, large size, and heavy weight.

[0003] Existing crankcases are usually made in one piece. Due to the large number of integrated oil passages, the manufacturing difficulty and cost of crankcases are very high. If the crankcase is large, it will also be very heavy, which is not conducive to the overall performance of the engine and will also increase transportation costs. These problems are particularly prominent for horizontally opposed engines, which have two cylinder blocks. Summary of the Invention

[0004] The purpose of this invention is to provide a frame-type crankcase to solve at least one of the problems mentioned in the background art.

[0005] The present invention provides a frame-type crankcase, including a first body and a second body connected together and a crankcase cover covering the first body and the second body. The first body and the second body are connected together to form a frame structure with four enclosing surfaces and two open surfaces. The two open surfaces are opposite to each other, and the crankcase cover is covered on one open surface.

[0006] The first body includes an integrally formed first generator housing body, a first frame plate, a second frame plate, and a third frame plate. The first frame plate is vertically disposed at one end of the second frame plate, and the third frame plate is arranged parallel to the first frame plate. One end of the third frame plate is connected to the second frame plate, and the first generator housing body is located on the side of the first frame plate away from the third frame plate.

[0007] The second body includes an integrally formed second generator housing body, a fourth frame plate, a fifth frame plate, and a sixth frame plate. The fourth frame plate is vertically disposed at one end of the fifth frame plate, and the sixth frame plate is arranged parallel to the fourth frame plate. One end of the sixth frame plate is connected to the fifth frame plate, and the second generator housing body is located on the side of the fourth frame plate away from the sixth frame plate.

[0008] The first body and the second body are joined together to form the generator housing, and the first frame plate and the fourth frame plate are joined together to support one end of the crankshaft, and the third frame plate and the sixth frame plate are joined together to support the other end of the crankshaft.

[0009] As a further aspect of the present invention: a first semi-circular groove is provided on the side of the first frame plate that contacts the fourth frame plate, and a fourth semi-circular groove that mates with the first semi-circular groove is provided on the side of the fourth frame plate that contacts the first frame plate, and the first semi-circular groove and the fourth semi-circular groove mate to form a second crankshaft main bearing mounting hole; a second semi-circular groove and a third semi-circular groove are provided on the side of the third frame plate that contacts the sixth frame plate, and a fifth semi-circular groove that mates with the second semi-circular groove and a sixth semi-circular groove that mates with the third semi-circular groove are provided on the side of the sixth frame plate that contacts the third frame plate, and a second semi-circular groove that mates with the third semi-circular groove is provided on the side of the sixth frame plate that contacts the third frame plate, and a second semi-circular groove that mates with the fifth semi-circular groove mates to form a timing intermediate wheel mounting hole, and a third semi-circular groove that mates with the sixth semi-circular groove mates to form a first crankshaft main bearing mounting hole.

[0010] As a further aspect of the present invention: the first frame plate, the third frame plate, the fourth frame plate, and the sixth frame plate are all provided with camshaft mounting holes on the side near the crankcase cover, and the second frame plate and the fifth frame plate are all provided with cylinder mounting holes.

[0011] As a further aspect of the present invention: the side of the third frame plate that contacts the sixth frame plate is also provided with an oil pump mounting seat oil inlet, and the third frame plate is also provided with an oil pump inlet channel, which is located inside the oil pump mounting seat oil inlet.

[0012] The sixth frame plate is also provided with an oil pump mounting seat oil outlet on the side that contacts the third frame plate. The sixth frame plate is provided with an oil pump oil outlet passage. The fifth frame plate is provided with a twelfth oil passage that communicates with the oil pump oil outlet passage. The sixth frame plate is also provided with a thirteenth oil passage that communicates with the twelfth oil passage and the first crankshaft main bearing mounting hole.

[0013] As a further aspect of the present invention: the fifth frame plate is also provided with an eleventh oil passage communicating with the twelfth oil passage, and the eleventh oil passage is provided with a second piston cooling nozzle mounting seat.

[0014] As a further aspect of the present invention: the fourth frame plate is provided with a ninth oil passage communicating with the eleventh oil passage, the fourth frame plate is provided with a fifth oil passage and a sixth oil passage communicating with the ninth oil passage, the fourth frame plate is also provided with an eighth oil passage communicating with the camshaft mounting hole located on the fourth frame plate and the fifth oil passage, and the fourth frame plate is also provided with a seventh oil passage communicating with the ninth oil passage and the second crankshaft main bearing mounting hole.

[0015] As a further aspect of the present invention: the first frame plate is provided with a first oil passage that connects to the fifth oil passage, a second oil passage that connects to the sixth oil passage, and a third oil passage that connects the camshaft mounting hole located on the first frame plate with the first oil passage.

[0016] As a further aspect of the present invention: the second frame plate is provided with a fourth oil passage communicating with the second oil passage, and the fourth oil passage is provided with a first piston cooling nozzle mounting seat.

[0017] As a further aspect of the present invention: the sixth frame plate is also provided with a pressure relief valve mounting cavity, which is connected to the oil pump outlet passage.

[0018] As a further embodiment of the present invention: the crankcase cover is equipped with an oil-gas separator and an oil dipstick fitting hole, the oil return pipe of the oil-gas separator is connected to the inside of the crankcase, and the oil-gas separator is also provided with an exhaust pipe.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The crankcase is formed by connecting the first and second bodies in a split configuration. The split structure facilitates the installation and disassembly of internal components, making maintenance and replacement easier, as well as transportation. The frame structure optimizes the support performance of the crankcase, improves the load-bearing capacity and durability of the entire system, and reduces the weight and manufacturing cost of the crankcase while providing sufficient rigidity and strength. This achieves a lightweight design of the crankcase, which is of great significance for energy conservation and emission reduction.

[0021] 2. By forming multiple interconnected oil passages in the frame structure of the crankcase, lubrication of the camshaft, crankshaft, and piston is achieved, reducing the need for lubrication steel pipes and simplifying the engine structure.

[0022] 3. When irreversible failures such as cylinder scoring occur, traditional crankcases cannot be repaired and require complete replacement, which is very costly. However, with this frame-type crankcase, if only one side of the body is damaged, only the entire body needs to be replaced, saving on maintenance costs. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar or repeated elements are not repeatedly labeled. The elements or parts in the drawings are not necessarily drawn to scale.

[0024] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure after removing the crankcase cover in a preferred embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the first body in a preferred embodiment of the present invention.

[0027] Figure 4This is a schematic diagram of the structure of the second body in a preferred embodiment of the present invention.

[0028] Figure 5 This is a schematic diagram of the oil circuit according to a preferred embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram of the crankcase cover in a preferred embodiment of the present invention.

[0030] In the diagram: 1-First body; 11-First generator housing body; 12-First frame plate; 121-First oil passage; 122-Second oil passage; 123-Third oil passage; 124-First semi-circular groove; 13-Second frame plate; 131-Fourth oil passage; 132-First piston cooling nozzle mounting seat; 14-Third frame plate; 141-Second semi-circular groove; 142-Third semi-circular groove; 143-Oil pump mounting seat oil inlet; 144-Oil pump inlet passage; 15-Firming plate; 2-Second body; 21-Second generator housing body; 22-Fourth frame plate; 221-Fifth oil passage; 222-Sixth oil passage; 223-Fourth semi-circular groove; 224-Seventh oil passage; 225-Eighth oil passage; 226-First... 9. Oil passage; 23-Fifth frame plate; 232-Eleventh oil passage; 233-Second piston cooling nozzle mounting seat; 234-Twelfth oil passage; 24-Sixth frame plate; 241-Fifth semi-circular groove; 242-Sixth semi-circular groove; 243-Thirteenth oil passage; 244-Oil pump mounting seat oil outlet; 245-Oil pump oil outlet passage; 246-Pressure relief valve mounting cavity; 247-Tenth oil passage; 248-Fourteenth oil passage; 3-Crankcase cover; 31-Oil-gas separator; 311-Exhaust pipe; 32-Oil dipstick mating hole; 4-Camshaft mounting hole; 5-Timing intermediate pulley mounting hole; 6-First crankshaft main bearing mounting hole; 7-Oil pump mounting seat; 8-Cylinder mounting hole; 9-Second crankshaft main bearing mounting hole. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0033] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0034] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0035] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0037] Please see Figures 1-4 As shown, this embodiment provides a frame-type crankcase, including a first body 1 and a second body 2 connected together, and a crankcase cover 3 covering the first body and the second body.

[0038] The first body 1 includes an integrally formed first generator housing body 11, a first frame plate 12, a second frame plate 13, and a third frame plate 14. The first frame plate 12 is vertically disposed at one end of the second frame plate 13, and the third frame plate 14 is arranged parallel to the first frame plate 12. One end of the third frame plate 14 is connected to the second frame plate 13. The first generator housing body 11 is located on the side of the first frame plate 12 away from the third frame plate 14.

[0039] The second body 2 includes an integrally formed second generator housing body 21, a fourth frame plate 22, a fifth frame plate 23, and a sixth frame plate 24. The fourth frame plate 22 is vertically disposed at one end of the fifth frame plate 23, and the sixth frame plate 24 is arranged parallel to the fourth frame plate 22. One end of the sixth frame plate 24 is connected to the fifth frame plate 23. The second generator housing body 21 is located on the side of the fourth frame plate 22 away from the sixth frame plate 24.

[0040] The first body 1 and the second body 2 are connected to form the generator housing body 11 and the second generator housing body 21, thereby connecting the first frame plate 12 and the fourth frame plate 22, and the third frame plate 14 and the sixth frame plate 24 to support the crankshaft.

[0041] The first body 1 and the second body 2 are joined together to form a frame-type crankcase, which has four enclosing surfaces and two open surfaces. The two open surfaces are opposite each other. One open surface is covered by a crankcase cover 3, and the other open surface is covered by an oil pan (not shown in the attached diagram). The four enclosing surfaces are two sets of opposing enclosing surfaces. One set of opposing enclosing surfaces is formed by the joining and connection of the first frame plate 12 and the fourth frame plate 22 to support one end of the crankshaft, and the joining and connection of the third frame plate 14 and the sixth frame plate 24 to support the other end of the crankshaft. The other set of opposing enclosing surfaces is formed by the second frame plate 13 and the fifth frame plate 23. The second frame plate 13 and the fifth frame plate 23 are used to install and assemble the combustion chamber for the connecting rod and piston. The frame-type crankcase structure provides stable support for moving parts. The generator housing is integrated into the outside of the crankcase, which facilitates the installation of the generator. The structure is compact and reduces the size of the engine. The first body 1 and the second body 2 are each made of metal and are individually molded. Several mating bolt holes are formed in both bodies, and bolts are fitted into these holes to secure the first body 1 and the second body 2 together. The crankcase adopts a split structure, which facilitates the installation and disassembly of internal components and makes maintenance and component replacement easier. Preferably, the first body 1 and the second body 2 can be made of aluminum alloy by high-pressure casting. This provides sufficient rigidity and strength while reducing the weight of the crankcase. The frame structure optimizes the support performance of the crankcase, improving the load-bearing capacity and durability of the entire system. The matching crankcase cover 3 and oil pan can be injection molded from plastic, further reducing the weight and manufacturing cost of the crankcase, achieving a lightweight design that is of great significance for energy conservation and emission reduction.

[0042] The internal space of a frame-type crankcase is better suited to the motion trajectory of the crankshaft connecting rod mechanism. When the crankshaft is working, the connecting rod performs a compound motion of "reciprocating oscillation + rotation," and its motion trajectory is a cuboid spatial envelope along the crankshaft axis. The internal cavity shape of the frame-type crankcase is highly compatible with this envelope, which can effectively avoid interference between the connecting rod and the case wall, and the space utilization rate can reach more than 80%, avoiding volume redundancy and increased weight.

[0043] The horizontally opposed engine has cylinders and water jackets positioned on opposite sides of the crankcase. The crankcase also adopts a split-type structure on both sides. The mating surfaces of the first body 1 and the second body 2 are symmetrical planes of the two combustion systems. Each side corresponds to one cylinder and one water jacket, making the single-side structure simpler and reducing many unnecessary structures, crankcase bolts, and sealing surfaces.

[0044] In some embodiments, please refer to Figures 1-4 As shown, a first semicircular groove 124 is provided on the side of the first frame plate 12 that contacts the fourth frame plate 22, and a fourth semicircular groove 223 that mates with the first semicircular groove 124 is provided on the side of the fourth frame plate 22 that contacts the first frame plate 12. The first semicircular groove 124 and the fourth semicircular groove 223 mate to form a second crankshaft main bearing mounting hole 9. A second semicircular groove 141 and a third semicircular groove 142 are provided on the side of the third frame plate 14 that contacts the sixth frame plate 24, and a fifth semicircular groove 241 that mates with the second semicircular groove 141 and a sixth semicircular groove 242 that mates with the third semicircular groove 142 are provided on the side of the sixth frame plate 24 that contacts the third frame plate 14. The second semicircular groove 141 and the fifth semicircular groove 241 mate to form a timing intermediate wheel mounting hole 5, and the third semicircular groove 142 and the sixth semicircular groove 242 mate to form a first crankshaft main bearing mounting hole 6. The first frame plate 12, the third frame plate 14, the fourth frame plate 22, and the sixth frame plate 24 are all provided with camshaft mounting holes 4 on the side near the crankcase cover 3, and the second frame plate 13 and the fifth frame plate 23 are all provided with cylinder mounting holes 8. This facilitates the reasonable installation of the crankshaft, camshaft, timing system, combustion chamber, etc. on the crankcase frame structure, resulting in a compact structure.

[0045] The combustion chamber is installed in the cylinder mounting hole 8. The pistons on the connecting rods on both sides are assembled in the combustion chamber, and the first body 1 and the second body 2 are aligned. The crankshaft is mounted in the first crankshaft main bearing mounting hole 6 and the second crankshaft main bearing mounting hole 9. The intermediate wheel shaft of the timing system is installed in the intermediate timing wheel mounting hole 5. One camshaft is mounted in the camshaft mounting hole 4 of the first frame plate 12 and the third frame plate 14, and the other camshaft is mounted in the camshaft mounting hole 4 of the fourth frame plate 22 and the sixth frame plate 24. The entire assembly process is convenient and quick, and the layout of each component is reasonable.

[0046] In some embodiments, please refer to Figures 1-5As shown, the side of the third frame plate 14 that contacts the sixth frame plate 24 is also provided with an oil pump mounting seat oil inlet 143, and the third frame plate 14 is also provided with an oil pump inlet passage 144, which is located inside the oil pump mounting seat oil inlet 143. The side of the sixth frame plate 24 that contacts the third frame plate 14 is also provided with an oil pump mounting seat oil outlet 244, and the sixth frame plate 24 is provided with an oil pump outlet passage 245. The fifth frame plate 23 is provided with a twelfth oil passage 234 that communicates with the oil pump outlet passage 245. The sixth frame plate 24 is also provided with a thirteenth oil passage 243 that communicates with the twelfth oil passage 234 and the first crankshaft main bearing mounting hole 6. The sixth frame plate 24 is also provided with a tenth oil passage 247 that communicates with the thirteenth oil passage 243 and a fourteenth oil passage 248 that communicates with the oil pump outlet passage 245.

[0047] The oil pump mounting base has an oil inlet 143 and an oil pump mounting base outlet 244, which together constitute the oil pump mounting base 7 for mounting the oil pump. The oil pump inlet is connected to the oil pump inlet passage 144, and the oil pump outlet is connected to the oil pump outlet passage 245. An oil pan is installed on the opposite side of the crankcase cover 3. One end of the oil pump inlet passage 144 extends into the oil pan to draw the lubricating oil stored in the oil pan and pump it into the oil pump outlet passage 245. The twelfth oil passage 234 introduces the lubricating oil in the oil pump outlet passage 245 into the first crankshaft main bearing mounting hole 6 through the thirteenth oil passage 243 to lubricate and cool one end of the crankshaft and its bearing. The tenth oil passage 247 is used to lubricate the timing system outside the crankcase, and the fourteenth oil passage 248 is used to install a pressure sensor to detect the oil pressure in the oil passage.

[0048] The fifth frame plate 23 is also provided with an eleventh oil passage 232 that communicates with the twelfth oil passage 234. The eleventh oil passage 232 is provided with a second piston cooling nozzle mounting seat 233. The second piston cooling nozzle mounting seat 233 is equipped with a nozzle. The eleventh oil passage 232 introduces lubricating oil from the oil pump outlet passage 245 into the nozzle to lubricate and cool one side of the piston, preventing the piston from jamming or burning, while reducing wear and extending the service life of the components.

[0049] The fourth frame plate 22 is provided with a ninth oil passage 226 that communicates with the eleventh oil passage 232. The fourth frame plate 22 is provided with a fifth oil passage 221 and a sixth oil passage 222 that communicate with the ninth oil passage 226. The fourth frame plate 22 is also provided with an eighth oil passage 225 that communicates with the camshaft mounting hole 4 and the fifth oil passage 221 located in the fourth frame plate 22. The eighth oil passage 225 is used to lubricate and cool the camshaft and its bearing on one side. The fourth frame plate 22 is also provided with a seventh oil passage 224 that communicates with the ninth oil passage 226 and the second crankshaft main bearing mounting hole 9. The seventh oil passage 224 is used to lubricate and cool the crankshaft and its bearing on the other end.

[0050] The first frame plate 12 is provided with a first oil passage 121 that connects to the fifth oil passage 221, a second oil passage 122 that connects to the sixth oil passage 222, and a third oil passage 123 that connects the camshaft mounting hole 4 located in the first frame plate 12 with the first oil passage 121. Through the connection of the first oil passage 121 and the fifth oil passage 221, and the connection of the second oil passage 122 and the sixth oil passage 222, lubricating oil is guided from the second body 2 into the first body 1, and lubricating and cooling the camshaft and its bearings on the other side.

[0051] The second frame plate 13 is provided with a fourth oil passage 131 that communicates with the second oil passage 122. The fourth oil passage 131 is provided with a first piston cooling nozzle mounting seat 132, and a nozzle is installed on the first piston cooling nozzle mounting seat 132. The fourth oil passage 131 introduces lubricating oil from the second oil passage 122 into the nozzle to lubricate and cool the piston on the other side, so as to prevent the piston from jamming or burning, and at the same time reduce wear and extend the service life of the components.

[0052] The sixth frame plate 24 is also provided with a pressure relief valve mounting cavity 246, which is connected to the oil pump outlet passage 245. A pressure relief valve is installed in the pressure relief valve mounting cavity 246 and is connected to the oil pump outlet passage 245. The pressure relief valve can stabilize the oil (lubricating oil) pressure. When the oil pressure is too high, the oil will push open the pressure relief valve and open the pressure relief port, and the oil will flow directly back to the oil pan, thereby relieving the pressure and preventing the oil passage from rupturing, the filter from being damaged, etc. due to excessive oil pressure. It can also reduce mechanical losses. When the oil pressure returns to a safe level, the pressure relief valve will automatically close.

[0053] The lubrication passages for the camshaft, crankshaft, and pistons are all integrated into the crankcase frame structure, reducing the need for lubrication steel pipes and simplifying the engine structure. To prevent lubrication leakage at the passage joints, sealing rings are installed, and the preload is adjusted via the connecting bolts between the first body 1 and the second body 2 to achieve a good seal.

[0054] In some embodiments, please refer to Figure 3 , Figure 4 As shown, the second frame plate 13 is also provided with a stiffening rib 15, which is triangular in shape. One side of the stiffening rib 15 is connected to the third frame plate 14, and the other side is connected to the second frame plate 13, thereby strengthening the structural performance of the first body 1. Correspondingly, the same or similar stiffening ribs are also provided between the fifth frame plate 23 and the sixth frame plate 24 to strengthen the structural performance of the second body 2.

[0055] In some embodiments, please refer to Figure 6As shown, the crankcase cover 3 is equipped with an oil-gas separator 31 and an oil dipstick fitting hole 32. The oil return pipe of the oil-gas separator 31 connects to the inside of the crankcase, and the separated lubricating oil returns to the oil pan and is pumped back into the crankcase oil passage by the oil pump. The oil-gas separator 31 is also equipped with an exhaust pipe 311 connected to the intake manifold to send the separated clean gas into the combustion chamber. An oil dipstick is installed in the oil dipstick fitting hole 32 to measure the oil level and oil quantity in the crankcase, and to determine whether the oil level is within the safe range specified by the manufacturer.

[0056] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A frame-type crankcase, characterized in that, It includes a first body and a second body that are connected together, and a crankcase cover that is fitted onto the first body and the second body. The first body and the second body are connected together to form a frame structure with four enclosing surfaces and two open surfaces. The two open surfaces are opposite each other, and a crankcase cover is fitted onto one of the open surfaces. The first body includes an integrally formed first generator housing body, a first frame plate, a second frame plate, and a third frame plate. The first frame plate is vertically disposed at one end of the second frame plate, and the third frame plate is arranged parallel to the first frame plate. One end of the third frame plate is connected to the second frame plate, and the first generator housing body is located on the side of the first frame plate away from the third frame plate. The second body includes an integrally formed second generator housing body, a fourth frame plate, a fifth frame plate, and a sixth frame plate. The fourth frame plate is vertically disposed at one end of the fifth frame plate, and the sixth frame plate is arranged parallel to the fourth frame plate. One end of the sixth frame plate is connected to the fifth frame plate, and the second generator housing body is located on the side of the fourth frame plate away from the sixth frame plate. The first body and the second body are connected to form the generator housing, and the first frame plate and the fourth frame plate are connected to support one end of the crankshaft, and the third frame plate and the sixth frame plate are connected to support the other end of the crankshaft. The first frame plate has a first semi-circular groove on the side that contacts the fourth frame plate, and the fourth frame plate has a fourth semi-circular groove on the side that contacts the first frame plate, which mates with the first semi-circular groove. The first semi-circular groove and the fourth semi-circular groove mate to form a second crankshaft main bearing mounting hole. The third frame plate has a second semi-circular groove and a third semi-circular groove on the side that contacts the sixth frame plate, and the sixth frame plate has a fifth semi-circular groove that mates with the second semi-circular groove and a sixth semi-circular groove that mates with the third semi-circular groove on the side that contacts the third frame plate. The second semi-circular groove and the fifth semi-circular groove mate to form a timing intermediate pulley mounting hole, and the third semi-circular groove and the sixth semi-circular groove mate to form a first crankshaft main bearing mounting hole. The first frame plate, the third frame plate, the fourth frame plate, and the sixth frame plate are all provided with camshaft mounting holes on the side near the crankcase cover, and the second frame plate and the fifth frame plate are all provided with cylinder mounting holes.

2. A frame-type crankcase according to claim 1, characterized in that, The side of the third frame plate that contacts the sixth frame plate is also provided with an oil pump mounting seat oil inlet. The third frame plate is also provided with an oil pump inlet channel, which is located inside the oil pump mounting seat oil inlet. The sixth frame plate is also provided with an oil pump mounting seat oil outlet on the side that contacts the third frame plate. The sixth frame plate is provided with an oil pump oil outlet passage. The fifth frame plate is provided with a twelfth oil passage that communicates with the oil pump oil outlet passage. The sixth frame plate is also provided with a thirteenth oil passage that communicates with the twelfth oil passage and the first crankshaft main bearing mounting hole.

3. A frame-type crankcase according to claim 2, characterized in that, The fifth frame plate is also provided with an eleventh oil passage that is connected to the twelfth oil passage, and the eleventh oil passage is provided with a second piston cooling nozzle mounting seat.

4. A frame-type crankcase according to claim 3, characterized in that, The fourth frame plate is provided with a ninth oil passage that communicates with the eleventh oil passage, a fifth oil passage and a sixth oil passage that communicate with the ninth oil passage, an eighth oil passage that communicates with the camshaft mounting hole located on the fourth frame plate and the fifth oil passage, and a seventh oil passage that communicates with the ninth oil passage and the second crankshaft main bearing mounting hole.

5. A frame-type crankcase according to claim 4, characterized in that, The first frame plate is provided with a first oil passage that connects to the fifth oil passage, a second oil passage that connects to the sixth oil passage, and a third oil passage that connects the camshaft mounting hole located on the first frame plate with the first oil passage.

6. A frame-type crankcase according to claim 5, characterized in that, The second frame plate is provided with a fourth oil passage that communicates with the second oil passage, and the fourth oil passage is provided with a first piston cooling nozzle mounting seat.

7. A frame-type crankcase according to claim 6, characterized in that, The sixth frame plate is also provided with a pressure relief valve mounting cavity, which is connected to the oil pump outlet passage.

8. A frame-type crankcase according to claim 1, characterized in that, The crankcase cover is equipped with an oil-gas separator and an oil dipstick fitting hole. The oil return pipe of the oil-gas separator is connected to the inside of the crankcase, and the oil-gas separator is also equipped with an exhaust pipe.

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