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CN-122014453-A - Engine, engine assembly and vehicle

CN122014453ACN 122014453 ACN122014453 ACN 122014453ACN-122014453-A

Abstract

The invention discloses an engine, an engine assembly and a vehicle, relates to the technical field of vehicles, and aims to solve the problems of overheating and abrasion of working components in a cylinder cover or a crank chamber. The engine includes a block and a cylinder head. The cylinder body is provided with a combustion chamber and a crank chamber communicated with the combustion chamber, and the crank chamber is used for installing a crank. The cylinder cover is arranged on one side of the combustion chamber, which is opposite to the crank chamber, and is connected with the cylinder body. The cylinder cover is provided with a cylinder cover space and a first exhaust port, and the cylinder cover space is communicated with the first exhaust port. The engine is provided with an exhaust passage, an inlet of the exhaust passage is communicated with the crank chamber, and an outlet of the exhaust passage is communicated with the cylinder cover space.

Inventors

  • ZHANG NAN
  • LI JUAN
  • JIANG GUANGMEI
  • REN YANAN
  • LUAN XIAOHE

Assignees

  • 比亚迪股份有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (20)

  1. 1. An engine, comprising: A cylinder body (1), wherein the cylinder body (1) is provided with a combustion chamber (11) and a crank chamber (12) communicated with the combustion chamber (11), and the crank chamber is used for installing a crank; the cylinder cover (2) is arranged on one side of the combustion chamber (11) opposite to the crank chamber (12) and is connected with the cylinder body (1), the cylinder cover (2) is provided with a cylinder cover space (22) and a first exhaust port (21), and the cylinder cover space (22) is communicated with the first exhaust port (21); the engine is provided with an exhaust passage, an inlet of which communicates with the crank chamber (12), and an outlet of which communicates with the head space (22).
  2. 2. The engine according to claim 1, characterized in that the inlet of the exhaust passage is located at one end of the engine in a first direction perpendicular to the direction of arrangement of the cylinder head (2) and the block (1) and perpendicular to the direction of extension of the crankshaft.
  3. 3. The engine according to claim 2, wherein the first exhaust port (21) and the outlet of the exhaust passage are located at both ends of the cylinder head (2) along an extending direction of the crankshaft, respectively, the extending direction of the crankshaft being perpendicular to an arrangement direction of the cylinder head (2) and the cylinder block (1).
  4. 4. The engine according to claim 1, characterized in that the cylinder head (2) is provided with a first channel (231), the first channel (231) extending in the direction of arrangement of the cylinder head (2) and the cylinder block (1), the head space (22) being located at the side of the first channel (231) facing away from the cylinder block (1); the cylinder body (1) is provided with a second channel (13), the second channel (13) is communicated with one end of the first channel (231) towards the cylinder body (1), and the second channel (13) and the first channel (231) form the exhaust channel.
  5. 5. The engine according to claim 4, characterized in that the outlet of the first passage (231) communicates with the head space (22), the outlet of the second passage (13) communicates with the inlet of the first passage (231), the inlet of the second passage (13) communicates with the crank chamber (12), and the area of the cross section of the outlet of the second passage (13) is larger than the area of the cross section of the inlet of the second passage (13).
  6. 6. An engine according to claim 5, characterized in that the second channel (13) comprises: -a first sub-section (321), the outlet of the first sub-section (321) being in communication with the inlet of the first channel (231); -a second sub-section (322), the outlet of the second sub-section (322) being in communication with the inlet of the first sub-section (321), the inlet of the second sub-section (322) being in communication with the crank chamber (12); the area of the cross section of the outlet of the second sub-pipe section (322) is larger than the area of the cross section of the inlet of the first sub-pipe section (321).
  7. 7. An engine according to claim 1, characterized in that an oil passage (8) through which lubricating oil flows is provided in the cylinder, the oil passage (8) being located in the cylinder (1) between the exhaust passage and the crank chamber (12).
  8. 8. The engine according to claim 7, characterized in that the inner wall of the exhaust channel on the side facing away from the oil channel (8) is provided with an opening extending to the outer surface of the cylinder (1), and the engine further comprises a shielding cover (4) covering the opening.
  9. 9. The engine according to claim 8, characterized in that the exhaust passage is at least partially recessed to a side facing away from the outer surface of the cylinder block (1) to form a recess (3221), the recess (3221) and the oil passage (8) being provided in this order in the arrangement direction of the cylinder head (2) and the cylinder block (1).
  10. 10. The engine according to claim 6, characterized in that the dimension of the end of the second sub-pipe section (322) facing the first sub-pipe section (321) is larger than the dimension of the end of the second sub-pipe section (322) facing away from the first sub-pipe section (321) in the direction of arrangement of the cylinder head (2) and the cylinder block (1).
  11. 11. The engine of any one of claims 1-10, further comprising: A timing cover (5), along the extending direction of the crankshaft, wherein the timing cover (5) is arranged on one side of the cylinder body (1) and forms a containing space (51) with the cylinder body (1); The cylinder body (1) is further provided with a second exhaust port (16), and the second exhaust port (16) is communicated with the crank chamber (12) and is communicated with the accommodating space (51).
  12. 12. The engine of any one of claims 1-10, further comprising: And the timing cover (5) is arranged on one side of the cylinder body (1) along the extending direction of the crankshaft, a containing space (51) is formed between the timing cover (5) and the cylinder body (1), and the first exhaust port (21) is communicated with the containing space (51).
  13. 13. The engine according to claim 12, characterized in that the cylinder (1) is provided with a return air port communicating with the containing space (51) for exhausting the gas of the containing space (51); and/or the timing cover (5) is provided with a return air port which is communicated with the accommodating space (51) and is used for discharging the gas in the accommodating space (51).
  14. 14. The engine of claim 13, further comprising: The filter (6), filter (6) are located accommodation space (51), filter (6) are equipped with air inlet (61) and gas outlet (62), air inlet (61) with accommodation space (51) intercommunication, gas outlet (62) with return air mouth intercommunication.
  15. 15. The engine of claim 12, further comprising: An oil pan (7), wherein the oil pan (7) is connected below the cylinder body (1) and is positioned below the timing cover (5), and a containing cavity (71) is defined between the oil pan (7) and the cylinder body (1) and the timing cover (5); The accommodating space (51) is communicated with the accommodating cavity (71).
  16. 16. The engine according to claim 15, characterized in that one side of the crank chamber (12) in a first direction is in communication with the exhaust passage, the other side of the crank chamber (12) in the first direction is in communication with the accommodation chamber (71), the first direction is perpendicular to the direction of arrangement of the cylinder head (2) and the cylinder block (1), and perpendicular to the direction of extension of the crankshaft.
  17. 17. The engine according to claim 12, characterized in that the cylinder block (1) is further provided with a second exhaust port (16), the second exhaust port (16) being in communication with the crank chamber (12) and with the accommodation space (51).
  18. 18. The engine according to claim 17, characterized in that the second exhaust port (16) and the outlet of the exhaust passage are located at both ends of the cylinder block (1), respectively, in the extending direction of the crankshaft.
  19. 19. The engine of claim 17, characterized in that the engine comprises a plurality of combustion chambers (11), the crank chamber (12) comprising a plurality of crank chambers (121); the cylinder body (1) is provided with a plurality of mounting ports, one crank chamber (12) is communicated with one combustion chamber (11) through one mounting port, and the mounting ports are used for arranging connecting rods.
  20. 20. The engine according to claim 19, wherein the plurality of crank chambers (121) are arranged in an extending direction of the crankshaft, the plurality of crank chambers (121) are communicated in sequence, and the second exhaust port (16) is communicated with at least one of the crank chambers (121).

Description

Engine, engine assembly and vehicle Technical Field The invention relates to the technical field of vehicles, in particular to an engine, an engine assembly and a vehicle. Background The engine of the vehicle comprises a cylinder cover and a cylinder body, wherein a combustion chamber and a crank chamber are arranged in the cylinder body, and a piston, an air inlet valve for conveying fuel gas and an exhaust valve for exhausting waste gas are arranged in the combustion chamber. During operation of the engine, gas within the combustion chamber may leak into the crank chamber through a gap between the piston and the combustion chamber or into the cylinder head through an intake valve or an exhaust valve, causing overheating and wear of working components inside the cylinder head or within the crank chamber. In the related art, the gas leaked into the crank chamber is usually discharged from the crank chamber and the gas leaked into the cylinder head is discharged from the cylinder head, but since the amount of the gas leaked into the cylinder head is small, it is difficult to discharge the gas from the cylinder head, resulting in poor effect of discharging the gas leaked into the cylinder head from the cylinder head. Disclosure of Invention The invention aims to provide an engine, an engine assembly and a vehicle, and aims to solve the problems of overheating and abrasion of working components in an air cylinder cover or in a crank chamber. In order to achieve the above purpose, the invention adopts the following technical scheme: In a first aspect of the application, an engine is provided that includes a cylinder block and a cylinder head. The cylinder body is provided with a combustion chamber and a crank chamber communicated with the combustion chamber, and the crank chamber is used for installing a crank. The cylinder cover is arranged on one side of the combustion chamber, which is opposite to the crank chamber, and is connected with the cylinder body. The cylinder cover is provided with a cylinder cover space and a first exhaust port, and the cylinder cover space is communicated with the first exhaust port. The engine is provided with an exhaust passage, an inlet of the exhaust passage is communicated with the crank chamber, and an outlet of the exhaust passage is communicated with the cylinder cover space. Through the arrangement, in the working process of the engine, along with the leakage of the fuel gas in the combustion chamber into the crank chamber and the cylinder cover space, the content of the fuel gas in the crank chamber and the cylinder cover space can be gradually increased. Since the amount of the gas leaked into the crank chamber is larger than the amount of the gas leaked into the head space, the pressure of the gas in the crank chamber may be larger than the pressure of the gas in the head space. Because the cylinder cover space is communicated with the first exhaust port, the exhaust channel is communicated with the crank chamber and is communicated with the cylinder cover space, under the action of gas pressure, gas in the crank chamber can flow into the cylinder cover space through the exhaust channel and drive the gas in the cylinder cover space to flow into the first exhaust port, and then the cylinder cover space is discharged. In this way, by providing the exhaust passage and the first exhaust port, the gas leaked from the combustion chamber into the crank chamber can be discharged from the crank chamber, and the gas leaked into the cylinder head space can be driven to be discharged from the cylinder head space by the gas in the crank chamber, so that the effect of discharging the gas leaked into the cylinder head space can be improved. In some embodiments, the inlet of the exhaust passage is located at one end of the engine in a first direction that is perpendicular to the direction of arrangement of the cylinder head and the block and perpendicular to the direction of extension of the crankshaft. In some embodiments, the outlets of the first exhaust port and the exhaust passage are located at both ends of the cylinder head, respectively, in the extending direction of the crankshaft. The extending direction of the crankshaft is perpendicular to the arrangement direction of the cylinder head and the cylinder body. In some embodiments, the cylinder head is provided with a first channel extending in the direction of arrangement of the cylinder head and the cylinder block, the head space being located on the side of the first channel facing away from the cylinder block. The cylinder body is provided with a second channel, and the second channel is communicated with one end of the first channel, which faces the cylinder body. The second passage and the first passage form an exhaust passage. In some embodiments, the outlet of the first passage communicates with the head space. The outlet of the second channel is communicated with the inlet of the first channel, and the inlet of the s