CN215370054U

CN215370054U - Diesel engine capable of reducing height of engine body

Info

Publication number: CN215370054U
Application number: CN202121969474.9U
Authority: CN
Inventors: 兰棠洁; 王鹏程; 向本杰; 田战胜
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2021-12-31
Anticipated expiration: 2031-08-20

Abstract

The utility model discloses a diesel engine capable of reducing the height of an engine body, belongs to the field of engines, and solves the problem that a cylinder head cover interferes with a cab when the existing diesel engine is used with an automobile. The air compressor comprises an air cylinder body, a piston connecting rod assembly, a supercharger system, a fan assembly, an air compressor system assembly and a control system assembly, wherein the distance from the center of a crankshaft of the air cylinder body to the top surface is 362.4mm, the piston connecting rod assembly comprises a piston and a connecting rod, the connecting rod comprises a small head and a big head, the small head and the big head are connected through an intermediate rod, the distance between the top surface of the piston and the rotation center of the small head is 58mm, and the distance between the center of the small head and the center of the big head is 227.4 mm; the fan assembly comprises a fan mounting seat for mounting a fan, and the distance between the axis of the fan mounting seat and the axis of the output end of the crankshaft is 240 mm. The diesel engine effectively prevents the problem that the cylinder cover hood is contacted with the bottom surface of the cab of the whole vehicle.

Description

Diesel engine capable of reducing height of engine body

Technical Field

The present invention relates to engines, and more particularly, to a diesel engine having a reduced body height.

Background

When the K11 diesel engine is used with a certain type of automobile, the diesel engine of the type is installed on the whole automobile, the top surface of the cylinder head cover of the diesel engine is in contact with the bottom surface of a cab, and after the automobile is used for a long time, the diesel engine is easy to collide and the problem of damage is caused. Therefore, how to reduce the height from the diesel engine itself becomes a challenge to be overcome.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of the prior art, and aims to provide a diesel engine capable of reducing the height of an engine body, effectively preventing a cylinder head cover from contacting with the bottom surface of a cab of the whole automobile, and having the characteristic of convenient design and manufacture.

The technical scheme of the utility model is as follows: a diesel engine capable of reducing the height of an engine body comprises an air cylinder body, a plug connecting rod assembly, a supercharger system, a fan assembly, an air compressor system assembly and a control system assembly, wherein the distance from the center of a crankshaft of the air cylinder body to the top surface is 362.4mm, the piston connecting rod assembly comprises a piston and a connecting rod, the connecting rod comprises a small head and a big head, the small head and the big head are connected through a middle rod, the small head is rotatably connected with the piston through a pin shaft, the big head is rotatably connected with the crankshaft in the air cylinder body, the distance between the top surface of the piston and the rotating center of the small head is 58mm, and the distance between the center of the small head and the center of the big head is 227.4 mm; the fan assembly comprises a fan mounting seat for mounting a fan, the fan mounting seat is mounted right above the crankshaft output end of the cylinder body, and the distance between the axis of the fan mounting seat and the axis of the crankshaft output end is 240 mm.

As a further improvement, chamfer structures are arranged between the two ends of the middle rod and the small head and the large head, the chamfer structures between the middle rod and the small head are all R70mm, and the diameter of the inner wall of the small head is 53 mm; the chamfer between the middle rod and the big head comprises a left chamfer and a right chamfer, the radius of the left chamfer is larger than that of the right chamfer, and the diameter of the inner wall of the big head is 95 mm.

Further, the microcephaly inner wall seted up the lubrication oil groove, the lubrication oil groove including crossing oilhole and arc oil groove, the oilhole run through the microcephaly, the arc oil groove extend along the inner wall circumference of microcephaly, just the arc oil groove with cross the oilhole intercommunication, the end of arc oil groove be equipped with along microcephaly axial extension's oil discharge tank.

Further, the lower side surface of the oil discharge groove is an arc-shaped surface, and two ends of the upper side surface of the oil discharge groove extend along the circumferential arc of the small end.

Further, the booster system include booster spiral case and booster compressor casing, the air inlet of booster spiral case is connected with the gas outlet of booster compressor casing, the gas outlet of booster spiral case is connected with and takes over behind the turbine, the air inlet of booster compressor casing is connected with the compressor intake pipe, the junction between booster spiral case and the booster compressor casing is connected with booster oil return pipe and booster oil inlet pipe respectively, booster oil return pipe downwardly extending and be connected with the cylinder block, booster oil inlet pipe earlier the level pass booster compressor casing top, then vertical buckling downwards again, extend and be connected with the cylinder block along the direction of perpendicular cylinder block at last.

Further, the last still integration of booster compressor casing be provided with the exhaust-bypass valve, the gas outlet of exhaust-bypass valve and booster compressor casing between be equipped with the bypass valve pipeline, the one end of bypass valve pipeline is connected with the gas outlet of booster compressor casing, the other end is walked around booster oil inlet pipe, compressor intake pipe in proper order and is connected with the exhaust-bypass valve.

Furthermore, the air compressor system assembly comprises an air compressor water inlet pipe and an air compressor water return pipe, one end of the air compressor water inlet pipe is connected with the air compressor on one side of the air cylinder body, and the other end of the air compressor water inlet pipe is bent upwards, then bypasses the upper part of the gear chamber of the air cylinder body, extends to the other side of the air cylinder body, and finally passes through the outer side of the oil return pipe of the oil-gas separator to be connected with the air cylinder body; one end of the air compressor water return pipe is connected with the air compressor on one side of the air cylinder body, and the other end of the air compressor water return pipe penetrates through the upper portion of the air compressor, then is bent upwards, then bypasses the upper portion of the gear chamber of the air cylinder body, extends to the other side of the air cylinder body, and finally penetrates through the inner side of the oil return pipe of the oil-gas separator to be connected with the air cylinder body.

Further, the control system assembly include ECU body, engine pencil interface and whole car pencil interface, engine pencil interface be located the lower part of ECU body, whole car pencil interface be located the upper portion of ECU body, engine pencil interface, the equal ECU body electric connection of whole car pencil interface.

Furthermore, the axial lead of the piston and the rotation center of the small head are eccentrically arranged, and the eccentric distance between the axial lead of the piston and the rotation center of the small head is 0.5 mm.

Advantageous effects

Compared with the prior art, the utility model has the following advantages:

according to the diesel engine with the height reduced, the cylinder body is reduced in height, the piston and the connecting rod are synchronously shortened to match the reduced cylinder body for application, so that the mounting position of the cylinder cover is reduced, the reduction of the overall height of the diesel engine is realized, the problem that the cylinder cover hood is contacted with the bottom surface of a cab of the whole vehicle is effectively solved, and the diesel engine with the height reduced has the characteristic of convenience in design and manufacture.

Drawings

FIG. 1 is a schematic perspective view of one side of the utility model;

FIG. 2 is a front view of the piston of the present invention;

FIG. 3 is a front view of the connecting rod of the present invention;

FIG. 4 is a schematic perspective view of a connecting rod according to the present invention;

FIG. 5 is a schematic side view of the present invention;

FIG. 6 is an enlarged view of the structure at A in FIG. 5;

FIG. 7 is an enlarged schematic view of the supercharger system of the present invention;

FIG. 8 is a schematic view of the air compressor assembly according to one aspect of the present invention;

FIG. 9 is a schematic view of an air compressor assembly according to another aspect of the present invention;

FIG. 10 is a schematic view of a control system assembly according to one aspect of the present invention;

fig. 11 is a schematic view of the present invention in its installed configuration.

Wherein: 1-piston, 2-small head, 3-big head, 4-middle rod, 5-sink groove, 6-oil passing hole, 7-arc oil groove, 8-oil drain groove, 9-cylinder block, 10-fan mounting seat, 11-crankshaft output end, 12-supercharger volute, 13-supercharger compressor shell, 14-turbine rear connecting pipe, 15-compressor air inlet pipe, 16-supercharger oil return pipe, 17-supercharger oil inlet pipe, 18-exhaust bypass valve, 19-bypass valve pipeline, 20-air compressor water inlet pipe, 21-air compressor water return pipe, 22-air compressor, 23-gear chamber, 24-oil-gas separator oil return pipe, 25-ECU body, 26-engine wiring harness plug interface, 27-vehicle wiring harness plug interface, 25-vehicle wiring harness plug interface, etc, 28-V-shaped groove, 29-fixing lug, 30-first reinforcing rib, 31-second reinforcing rib, 32-fixing clamp and 33-crossbeam.

Detailed Description

The utility model will be further described with reference to specific embodiments shown in the drawings.

Referring to fig. 1 to 11, the method for reducing the height of the engine body according to the present invention is to achieve the height reduction by optimizing the dimensions of the cylinder block, the piston and the connecting rod of the diesel engine, wherein the dimensions are optimized as follows:

(1) the height of the cylinder body is reduced: the height from the crankshaft center of the cylinder block to the top surface is reduced from 398.2mm to 362.4 mm;

(2) and (3) reducing the height of the piston: reducing the distance from the top surface of the piston to the rotation center of the small end of the connecting rod from 80.2mm to 58 mm;

(3) the height of the connecting rod is reduced: the distance from the center of the small end of the connecting rod to the center of the large end of the connecting rod is reduced from 241mm to 227.4 mm.

According to the method for reducing the height of the engine body, the height of the engine body is reduced by selecting the parts such as the cylinder body, the piston and the connecting rod of the diesel engine, and the height of the engine body of the diesel engine is reduced on the premise of ensuring convenient installation, enough strength and lower cost, so that the diesel engine is installed on the whole vehicle in a matching manner.

A diesel engine capable of reducing height of an engine body comprises an air cylinder body 9, a plug connecting rod assembly, a supercharger system, a fan assembly, an air compressor system assembly and a control system assembly, wherein the distance from the center of a crankshaft of the air cylinder body 9 to the top surface is 362.4mm, the specific reduction mode is that the thickness is reduced from the top surface of the air cylinder body 9 to the center of the crankshaft, so that the height of the air cylinder body 9 is reduced, the piston connecting rod assembly is installed in the air cylinder body 9 and comprises a piston 1 and a connecting rod, wherein the connecting rod comprises a small head 2 and a large head 3, the small head 2 is connected with the large head 3 through a middle rod 4, the small head 2 is rotatably connected with the piston 1 through a pin shaft, the large head 3 is rotatably connected with the crankshaft in the air cylinder body 9, the distance between the top surface of the piston 1 and the rotation center of the small head 2 is 58mm (shown as H1 in figure 2), and the requirement of structural strength of the piston is met, easy structural design and product manufacture. Preferably, the piston 1 is a steel piston, so that the structural strength of the piston is ensured. The distance between the center of the small head 2 and the center of the large head 3 is 227.4mm (as shown in H2 in FIG. 2), which meets the strength requirement of the connecting rod structure and is easy to arrange and manufacture. According to the piston connecting rod assembly, the distance between the top surface of the piston 1 and the rotation center of the small head 2 is limited to 58mm, and the distance between the center of the small head 2 and the center of the large head 3 is limited to 227.4mm, so that the piston connecting rod assembly can be installed in the cylinder block 9, the compression ratio of a diesel engine is guaranteed to meet actual requirements, and the problem that the existing piston connecting rod assembly cannot be installed and matched with the compression ratio after the diesel engine is changed is solved.

Preferably, chamfer structures are arranged between the two ends of the middle rod 4 and the small head 2 and the large head 3, wherein the chamfer structures between the middle rod 4 and the small head 2 are both R70mm (shown as a1 in fig. 3), so that the problem of interference between the connecting rod and the cylinder block is avoided while the requirement on the structural strength of the connecting rod is met, and the diameter of the inner wall of the small head 2 is 53mm (shown as d in fig. 3), so that the diameter of the small head is increased compared with the diameter of the traditional small head, a large clearance fit is formed between the small head 2 and the pin shaft, and the smooth rotation of the connecting rod is ensured; the chamfer between the middle rod 4 and the big head 3 comprises a left chamfer and a right chamfer, wherein the radius of the left chamfer is larger than that of the right chamfer, specifically, the left chamfer is R60mm (shown as a2 in fig. 3), the right chamfer is R20mm (shown as a3 in fig. 3), the interference between a connecting rod and a cylinder block is avoided, and the diameter of the inner wall of the big head 3 is 95mm (shown as D in fig. 3), so that the big head 3 is well matched and installed on a crankshaft. In the piston connecting rod assembly, the chamfer structures are arranged among the large head 3, the small head 2 and the middle rod 4 of the connecting rod, so that the problem that the joints of the middle rod, the large head and the small head are interfered with a cylinder body after the connecting rod is shortened can be solved, and the structural strength of the connecting rod can be improved.

Preferably, both sides of the intermediate rod 4 are provided with the sinking grooves 5, so that the structural strength of the connecting rod is further improved.

Preferably, a lubricating oil groove is formed in the inner wall of the small head 2, the lubricating oil groove comprises an oil passing hole 6 and an arc-shaped oil groove 7, the oil passing hole 6 penetrates through the small head 2, the arc-shaped oil groove 7 extends along the circumferential direction of the inner wall of the small head 2, the arc-shaped oil groove 7 is communicated with the oil passing hole 6, an oil discharge groove 8 extending along the axial direction of the small head 2 is formed in the tail end of the arc-shaped oil groove 7, lubricating oil enters the arc-shaped oil groove 7 through the oil passing hole 6, lubrication is provided between the small head 2 and the pin shaft, and the lubricating oil can be discharged through the oil discharge groove 8.

Preferably, the downside of oil drain tank 8 is the arcwall face, and the lubricating oil of discharging can collect in the downside of oil drain tank 8 the short time from arc oil groove 7, can further improve the lubricity, and the circumference arc extension of microcephaly 2 is followed at the side both ends of going up of oil drain tank 8, and lubricating oil can slowly circulate along microcephaly 2 circumference, can also further improve the lubricity.

Preferably, the axial lead of the piston 1 and the rotation center of the small head 2 are eccentrically arranged, and the eccentric distance between the axial lead of the piston 1 and the rotation center of the small head 2 is 0.5mm (as shown by K in figure 2), so that the stress between the connecting rod and the piston 1 can be improved, the friction force between the connecting rod and the piston 1 can be further reduced, and the service lives of the connecting rod and the piston can be prolonged.

The fan assembly is installed at one end of the cylinder block 9, the fan assembly comprises a fan mounting seat 10 for mounting a fan, the fan mounting seat 10 is installed right above the crankshaft output end 11 of the cylinder block 9, and the distance between the axis of the fan mounting seat 10 and the axis of the crankshaft output end 11 is 240mm (as shown in H3 in fig. 5). According to the diesel engine fan mounting structure, the distance between the axis of the fan mounting seat 10 and the axis of the crankshaft output end 11 is limited to 240mm, compared with the traditional fan mounting seat mounting position, the height is increased by 30mm, the problem that the fan is interfered by other parts is avoided, the fan can be conveniently mounted, the stress strength of the fan is effectively improved, and the problem that the existing fan is easily interfered by other parts after being mounted is solved.

Preferably, the V-shaped groove 28 is formed at the top of the fan mounting base 10, so that the fan mounting base 10 can be prevented from interfering with other components, and the structural strength of the fan mounting base 10 can be improved.

Preferably, be equipped with a plurality of fixed lugs 29 in fan mount pad 10 periphery, specifically, a plurality of fixed lugs 29 are fixed on four angles of fan mount pad 10, and the atress is more even, and every fixed lug 29 all is connected with cylinder block 9 through the bolt, makes things convenient for the dismouting to maintain.

Preferably, a first reinforcing rib 30 extending toward the center of the fan mounting base 10 is provided at one side of each fixing lug 29, so that the structural strength of the fan mounting base 10 is improved. Furthermore, a second reinforcing rib 31 is further arranged on the fan mounting seat 10 between two adjacent fixing lugs 29, so that the structural strength of the fan mounting seat 10 is further improved.

The supercharger system is arranged on one side of the cylinder block 9 and comprises a supercharger volute 12 and a supercharger compressor shell 13, wherein an air inlet of the supercharger volute 12 is connected with an air outlet of the supercharger compressor shell 13, an air outlet of the supercharger volute 12 is connected with a turbine rear connecting pipe 14, an air inlet of the supercharger compressor shell 13 is connected with a compressor air inlet pipe 15, a supercharger oil return pipe 16 and a supercharger oil inlet pipe 17 are respectively connected to a joint between the supercharger volute 12 and the supercharger compressor shell 13, the supercharger oil return pipe 16 extends downwards and is connected with the cylinder block 9, the supercharger oil inlet pipe 17 firstly horizontally penetrates through the upper portion of the supercharger compressor shell 13 and then vertically bends downwards, and finally extends along the direction perpendicular to the cylinder block 9 and is connected with the cylinder block 9, and interference of the supercharger compressor shell 13 and the compressor air inlet pipe 15 is avoided ingeniously. An exhaust bypass valve 18 is further integrally arranged on the supercharger compressor shell 13, a bypass valve pipeline 19 is arranged between the exhaust bypass valve 18 and the air outlet of the supercharger compressor shell 13, one end of the bypass valve pipeline 19 is connected with the air outlet of the supercharger compressor shell 13, the other end of the bypass valve pipeline is connected with the exhaust bypass valve 18 by bypassing the supercharger oil inlet pipe 17 and the compressor air inlet pipe 15 in sequence, and interference of the supercharger oil inlet pipe 17 and the compressor air inlet pipe 15 is avoided ingeniously.

According to the supercharger system, the structures of the supercharger oil inlet pipe 17, the supercharger oil return pipe 16 and the bypass valve pipeline 19 are redesigned, so that the supercharger oil inlet pipe 17 and the bypass valve pipeline 19 are reasonably inserted between the supercharger compressor shell 13, the supercharger air inlet pipe 15, the cylinder block 9 and the like, the problem that the supercharger oil inlet pipe 17, the cylinder block 9 and the bypass valve pipeline 19 of the supercharger system interfere with the air inlet pipe 15 of the air engine can be effectively solved, the pipeline layout of the supercharger system is reasonably optimized, the service life of the supercharger system is effectively prolonged while the installation requirement of a diesel engine after the height of the diesel engine is reduced is matched, and the problem that parts of the conventional supercharger system interfere with the engine body is solved.

The air compressor system assembly is arranged on the cylinder block 9 and comprises an air compressor water inlet pipe 20 and an air compressor water return pipe 21, wherein one end of the air compressor water inlet pipe 20 is connected with an air compressor 22 on one side of the cylinder block 9, the other end of the air compressor water inlet pipe is bent upwards, then bypasses the upper part of a gear chamber 23 of the cylinder block 9, extends to the other side of the cylinder block, and finally passes through the outer side of an oil-gas separator oil return pipe 24 to be connected with the cylinder block 9; one end of the air compressor water return pipe 21 is connected with the air compressor 22 on one side of the cylinder block 9, and the other end of the air compressor water return pipe passes through the upper part of the air compressor 22, then is bent upwards, then bypasses the upper part of the gear chamber 23 of the cylinder block 9, extends to the other side of the cylinder block 9, and finally passes through the inner side of the oil-gas separator oil return pipe 24 to be connected with the cylinder block 9.

According to the air compressor system assembly, the air compressor water inlet pipe 20 and the air compressor water return pipe 21 are wound above the gear chamber 23 and are respectively inserted between the inner side and the outer side of the oil-gas separator oil return pipe 24, so that the oil-gas separator oil return pipe 24 is clamped between the air compressor water inlet pipe 20 and the air compressor water return pipe 21, the problem that one pipeline is interfered with the oil-gas separator oil return pipe 24 due to the fact that the air compressor water inlet pipe 20 and the air compressor water return pipe 21 are both extruded on the inner side of the oil-gas separator oil return pipe 24 is avoided, the layout of air compressor pipelines is reasonably optimized, the service life of the air compressor pipelines is effectively prolonged, and the problem that the existing air compressor pipelines are easily interfered is solved.

Preferably, a fixing clip 32 for fixing the air compressor water inlet pipe 20 and the air compressor water return pipe 21 together is arranged on one side of the cylinder block 9 close to the air compressor 22, correspondingly, at least two fixing clips 32 for fixing the air compressor water inlet pipe 20 and the air compressor water return pipe 21 together are arranged on the cylinder block 9 above the gear chamber 23, the air compressor water inlet pipe 20 and the air compressor water return pipe 21 are fixed together through the fixing clips 32 and are fixed on the cylinder block 9 together, the pipeline is prevented from shaking due to vibration of the diesel engine, the connection reliability of the pipeline is further improved, and the service life of the pipeline is prolonged.

The control system assembly comprises an ECU body 25, an engine wiring harness interface 26 and a whole vehicle wiring harness interface 27, wherein the engine wiring harness interface 26 is located at the lower part of the ECU body 25, the whole vehicle wiring harness interface 27 is located at the upper part of the ECU body 25, and the engine wiring harness interface 26 and the whole vehicle wiring harness interface 27 are electrically connected with the ECU body 25.

According to the control system assembly, the whole vehicle wire harness inserting port 27 is adjusted from the lower part to the upper part, so that the whole vehicle wire harness inserting port 27 is higher than the girder 33 of a whole vehicle, a user can directly insert the whole vehicle wire harness into the whole vehicle wire harness inserting port 27, the mounting difficulty of the whole vehicle wire harness can be reduced, the whole vehicle wire harness can be rapidly mounted, the increase of a transition line is omitted, the cost is further reduced, and the problem that the whole vehicle wire harness of an ECU is inconvenient to mount after the existing diesel engine is mounted on the whole vehicle is solved.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various changes and modifications without departing from the structure of the utility model, which will not affect the effect of the utility model and the practicability of the patent.

Claims

1. The diesel engine capable of reducing the height of the engine body is characterized by comprising an engine block (9), a piston connecting rod assembly, a supercharger system, a fan assembly, an air compressor system assembly and a control system assembly, wherein the distance from the center of a crankshaft of the engine block (9) to the top surface is 362.4mm, the piston connecting rod assembly comprises a piston (1) and a connecting rod, the connecting rod comprises a small head (2) and a large head (3), the small head (2) and the large head (3) are connected through an intermediate rod (4), the small head (2) is rotationally connected with the piston (1) through a pin shaft, the large head (3) is rotationally connected with the crankshaft in the engine block (9), the distance between the top surface of the piston (1) and the rotation center of the small head (2) is 58mm, and the distance between the center of the small head (2) and the center of the large head (3) is 227.4 mm; the fan assembly comprises a fan mounting seat (10) used for mounting a fan, wherein the fan mounting seat (10) is mounted right above a crankshaft output end (11) of the cylinder body (9), and the distance between the axis of the fan mounting seat (10) and the axis of the crankshaft output end (11) is 240 mm.

2. The diesel engine capable of reducing the height of the engine body is characterized in that chamfer structures are arranged between the two ends of the middle rod (4) and the small end (2) and the large end (3), the chamfer structures between the middle rod (4) and the small end (2) are R70mm, and the diameter of the inner wall of the small end (2) is 53 mm; the chamfer between the middle rod (4) and the big head (3) comprises a left chamfer and a right chamfer, the radius of the left chamfer is larger than that of the right chamfer, and the diameter of the inner wall of the big head (3) is 95 mm.

3. A diesel engine with reduced engine height as claimed in claim 1, wherein the inner wall of the small head (2) is provided with a lubricating oil groove, the lubricating oil groove comprises an oil passing hole (6) and an arc oil groove (7), the oil passing hole (6) penetrates through the small head (2), the arc oil groove (7) extends along the circumferential direction of the inner wall of the small head (2), the arc oil groove (7) is communicated with the oil passing hole (6), and the tail end of the arc oil groove (7) is provided with an oil discharge groove (8) extending along the axial direction of the small head (2).

4. A diesel engine with reduced height of engine body as claimed in claim 3, characterized in that the lower side of the oil discharge groove (8) is arc-shaped, and both ends of the upper side of the oil discharge groove (8) extend along the arc of the small head (2).

5. The diesel engine capable of reducing the height of the engine body according to claim 1, wherein the supercharger system comprises a supercharger volute (12) and a supercharger compressor shell (13), an air inlet of the supercharger volute (12) is connected with an air outlet of the supercharger compressor shell (13), an air outlet of the supercharger volute (12) is connected with a turbine rear connecting pipe (14), an air inlet of the supercharger compressor shell (13) is connected with a compressor air inlet pipe (15), a connection part between the supercharger volute (12) and the supercharger compressor shell (13) is respectively connected with a supercharger oil return pipe (16) and a supercharger oil inlet pipe (17), the supercharger oil return pipe (16) extends downwards and is connected with the cylinder block (9), and the supercharger oil inlet pipe (17) horizontally penetrates through the upper part, the lower part and the upper part of the supercharger compressor shell (13) firstly, Then vertically bending downwards, finally extending along the direction vertical to the cylinder body (9) and connecting with the cylinder body (9).

6. A diesel engine capable of reducing height of an engine body as claimed in claim 5, wherein the supercharger compressor casing (13) is further provided with an exhaust-bypass valve (18) in an integrated manner, a bypass valve pipeline (19) is arranged between the exhaust-bypass valve (18) and the air outlet of the supercharger compressor casing (13), one end of the bypass valve pipeline (19) is connected with the air outlet of the supercharger compressor casing (13), and the other end of the bypass valve pipeline is connected with the exhaust-bypass valve (18) by bypassing the supercharger oil inlet pipe (17) and the compressor air inlet pipe (15) in sequence.

7. The diesel engine capable of reducing the height of the engine body is characterized in that the air compressor system assembly comprises an air compressor water inlet pipe (20) and an air compressor water return pipe (21), one end of the air compressor water inlet pipe (20) is connected with an air compressor (22) on one side of the cylinder body (9), and the other end of the air compressor water inlet pipe is bent upwards, then bypasses above a gear chamber (23) of the cylinder body (9), extends to the other side of the cylinder body, and finally passes through the outer side of an oil-gas separator oil return pipe (24) to be connected with the cylinder body (9); one end of the air compressor water return pipe (21) is connected with the air compressor (22) on one side of the air cylinder body (9), and the other end of the air compressor water return pipe penetrates through the upper portion of the air compressor (22), then is bent upwards, then bypasses the upper portion of the gear chamber (23) of the air cylinder body (9), extends to the other side of the air cylinder body (9), and finally penetrates through the inner side of the oil return pipe (24) of the oil-gas separator to be connected with the air cylinder body (9).

8. The diesel engine capable of reducing the height of the engine body according to claim 1, wherein the control system assembly comprises an ECU body (25), an engine harness interface (26) and a whole vehicle harness interface (27), the engine harness interface (26) is located at the lower portion of the ECU body (25), the whole vehicle harness interface (27) is located at the upper portion of the ECU body (25), and the engine harness interface (26) and the whole vehicle harness interface (27) are electrically connected with the ECU body (25).

9. A diesel engine with reduced engine body height according to any of the claims 1-8, characterized in that the axis of the piston (1) is arranged eccentrically to the rotation center of the small head (2), and the eccentric distance between the axis of the piston (1) and the rotation center of the small head (2) is 0.5 mm.