High-load output structure of diesel engine special for logistics

Abstract

The utility model discloses a high-load output structure of a diesel engine special for logistics, belongs to the technical field of diesel engines, and solves the technical problem that a crankshaft output end of an existing diesel engine special for logistics is poor in bending resistance. The output structure comprises an air cylinder body, a crankshaft, a flywheel shell, a flywheel and a connecting flange, the crankshaft is installed in the air cylinder body, the flywheel shell is installed at the output end of the air cylinder body, a bearing bush is arranged in a center hole of the flywheel shell, the connecting flange comprises a connecting sleeve and a flange plate located at one end of the connecting sleeve, and the connecting sleeve penetrates through the bearing bush and is connected to the output end of the crankshaft in a sleeving mode. The connecting sleeve is in clearance fit with the bearing bush, the flange plate is connected with a flywheel, the flywheel is located in a flywheel shell, a thrust bearing connected to the outer wall of the crankshaft in a sleeving mode is arranged between the flywheel shell and the air cylinder body, and an oil storage mechanism is arranged in the bearing bush. The output end of the crankshaft is further supported through the bearing bush, so that the torsional vibration resistance and the bending resistance of the crankshaft are improved, and the working performance of the whole machine is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of diesel engines, and more particularly to a high-load output structure of a special diesel engine for logistics. Background Art

[0002] An engine's power output assembly typically consists of a crankshaft, flywheel, and flywheel housing. The crankshaft is mounted within the engine block and supported by several main bearings within the block. The rear end of the crankshaft passes through the center hole of the flywheel housing and is bolted to the flywheel. When the engine is running, power is directly transferred to the flywheel through the crankshaft.

[0003] With the development of diesel engine technology, engine power density is increasing, and power output loads are also increasing. This places stringent demands on the torsional vibration and bending resistance of the diesel engine crankshaft system. This is especially true for high-speed, high-power diesel engines for logistics vehicles. Logistics vehicle-specific engines typically feature high horsepower and high torque to ensure good starting and climbing capabilities under heavy loads. Given that the main structural dimensions cannot be further increased, the crankshaft needs to withstand greater output torque.

[0004] However, the crankshaft output end of the existing logistics vehicle-specific engine has poor resistance to torsional vibration and bending, which affects the performance of the entire machine. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. The purpose of the present invention is to provide a structure for high-load output of a logistics-specific diesel engine that can improve its anti-torsional vibration and anti-bending capabilities.

[0006] The technical solution of the present invention is: a structure of high-load output of a logistics-specific diesel engine, comprising a cylinder block, a crankshaft, a flywheel housing, a flywheel, and a connecting flange, wherein the crankshaft is installed in the cylinder block, the flywheel housing is installed in the output end of the cylinder block, a bearing sleeve is provided in the center hole of the flywheel housing, the connecting flange comprises a connecting sleeve and a flange located at one end of the connecting sleeve, the connecting sleeve passes through the bearing sleeve and is sleeved on the output end of the crankshaft, the connecting sleeve and the bearing sleeve are clearance-fitted, the flange is connected to the flywheel, the flywheel is located in the flywheel housing, a thrust bearing sleeved on the outer wall of the crankshaft is provided between the flywheel housing and the cylinder block, and an oil storage mechanism is provided in the bearing sleeve.

[0007] As a further improvement, the oil storage mechanism includes a plurality of first oil storage grooves located on the inner wall of the bearing bushing, and an oil hole is provided on the side wall of one end of the bearing bushing.

[0008] Furthermore, a first annular groove is provided on the side wall of one end of the bearing bushing, and a plurality of evenly arranged oil holes are provided in the first annular groove.

[0009] Furthermore, the bearing bushing is installed in the center hole of the flywheel housing through interference fit.

[0010] Furthermore, a tapered hole is provided in the connecting sleeve, and a tapered surface is provided at the output end of the crankshaft, and an interference fit connection is formed between the tapered hole and the tapered surface.

[0011] Furthermore, the taper of the tapered hole is 1:50.

[0012] Furthermore, the inner wall of the tapered hole is provided with a spiral annular groove and a second annular groove connected to the spiral annular groove, a hydraulic channel is provided inside the connecting sleeve, one end of the hydraulic channel is connected to the second annular groove through a hydraulic oil inlet, and the flange is provided with a hydraulic oil joint installation port connected to the hydraulic channel.

[0013] Furthermore, the thrust bearing is disc-shaped, and an oil delivery channel is provided inside the thrust bearing. One end face of the thrust bearing is respectively provided with an oil inlet channel connected to the input end of the oil delivery channel and a first oil channel annular groove connected to the output end of the oil delivery channel. An oblique annular groove is provided on the end face between the oil inlet channel and the first oil channel annular groove.

[0014] Furthermore, the other end surface of the thrust bearing is provided with a second oil channel annular groove.

[0015] Beneficial effects

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. Compared with the traditional power output system structure, the present invention adds a first-stage support for the bearing bushing, and the added support is arranged on the flywheel housing, which increases the support stiffness of the shaft system, greatly improves the load-bearing capacity and power output capacity of the rear end of the engine, improves the torsional vibration and bending resistance of the crankshaft, and ensures the working performance of the entire machine.

[0018] 2. The thrust bearing of the crankshaft in the present invention is arranged on the flywheel housing and is disc-shaped and installed by bolts. The oil channel designed thereon for forced lubrication can introduce lubricating oil into both sides to improve lubrication performance.

[0019] 3. The additional support rail is realized through the connecting flange. The connecting flange and crankshaft are assembled through hydraulic expansion of the conical surface, which has strong torque transmission capacity, simple assembly and disassembly, and does not require redundant bolts. In addition, the tapered hole of the connecting flange is designed with a V-shaped ring groove and several spiral oil grooves. The spiral oil grooves and V-shaped ring grooves are connected, allowing the connecting flange to expand when hydraulic pressure is applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 is a cross-sectional view of the bearing bushing of the present invention;

[0022] Figure 3 Schematic diagram of the left side structure of the bearing bushing in the present invention;

[0023] Figure 4 It is a structural schematic diagram of the connecting flange in the present invention;

[0024] Figure 5 for Figure 4 Cross-sectional view in the AA direction;

[0025] Figure 6 Schematic diagram of the structure of the thrust bearing in the present invention;

[0026] Figure 7 for Figure 6 Cross-sectional view in the BB direction.

[0027] Among them: 1-cylinder block, 2-crankshaft, 3-flywheel housing, 4-flywheel, 5-connecting flange, 6-bearing bushing, 7-connecting sleeve, 8-flange, 9-thrust bearing, 10-first oil storage tank, 11-first oil hole, 12-first ring groove, 13-tapered hole, 14-spiral ring groove, 15-second ring groove, 16-hydraulic channel, 17-hydraulic oil inlet, 18-hydraulic oil joint installation port, 19-oil delivery channel, 20-oil inlet channel, 21-first oil channel ring groove, 22-oblique ring groove, 23-second oil channel ring groove, 24-fastening bolt, 25-second oil hole, 26-fastening bolt hole, 27-bolt installation hole, 28-second oil storage tank. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0029] See Figures 1 to 7 A high-load output structure of a special logistics diesel engine includes a cylinder block 1, a crankshaft 2, a flywheel housing 3, a flywheel 4, and a connecting flange 5. The crankshaft 2 is installed in the cylinder block 1, and the flywheel housing 3 is installed at the output end of the cylinder block 1. A bearing bushing 6 is provided in the center hole of the flywheel housing 3. The connecting flange 5 includes a connecting sleeve 7 and a flange 8 located at one end of the connecting sleeve 7. The connecting sleeve 7 passes through the bearing bushing 6 and is sleeved on the output end of the crankshaft 2. There is a clearance fit between the connecting sleeve 7 and the bearing bushing 6, and an interference fit between the connecting sleeve 7 and the output end of the crankshaft 2. The flange 8 is connected to the flywheel 4, and the flywheel 4 is located in the flywheel housing 3. Specifically, the flange 8 is connected to the flywheel 4 by a fastening bolt 24. A thrust bearing 9 sleeved on the outer wall of the crankshaft 2 is provided between the flywheel housing 3 and the cylinder block 1, and an oil storage mechanism is provided in the bearing bushing 6.

[0030] The oil storage mechanism includes a plurality of first oil storage grooves 10 located on the inner wall of the bearing bushing 6. A first oil hole 11 is provided in the first oil storage groove 10. Lubricating oil enters the first oil storage groove 10 from the first oil hole 11, which can improve the lubrication performance of the bearing bushing 6.

[0031] Furthermore, a first annular groove 12 is provided on the inner wall of one end of the bearing bushing 6, and a plurality of evenly arranged second oil holes 25 are provided in the first annular groove 12, which serve as channels for lubricating oil to enter the working surface of the bearing bushing 6, and can also improve the lubrication performance of the bearing bushing 6.

[0032] In this embodiment, the bearing bushing 6 is installed in the center hole of the flywheel housing 3 by interference fit.

[0033] A tapered hole 13 is provided in the connecting sleeve 7, and a tapered surface is provided at the output end of the crankshaft 2. An interference fit is formed between the tapered hole 13 and the tapered surface. Preferably, the taper of the tapered hole 13 is 1:50.

[0034] Furthermore, the inner wall of the tapered hole 13 is provided with a spiral annular groove 14 and a second annular groove 15 connected to the spiral annular groove 14. A hydraulic channel 16 is provided within the connecting sleeve 7, one end of which is connected to the second annular groove 15 via a hydraulic oil inlet 17. The flange 8 is provided with a hydraulic oil connector installation port 18 connected to the hydraulic channel 16, allowing for high-pressure hydraulic oil to be connected during installation, enabling hydraulic expansion installation. The outer periphery of the flange 8 is provided with a plurality of evenly spaced fastening bolt holes 26 for fastening bolts 24 to the flywheel 4.

[0035] The process of installing the connecting flange 5 is to first install the hydraulic oil joint on the hydraulic oil joint installation port 18, then insert the connecting sleeve 7 into the output end of the crankshaft 2, and then connect the high-pressure oil. The high-pressure oil passes through the hydraulic oil joint installation port 18, the hydraulic channel 16, and the hydraulic oil inlet 17 in sequence and enters the spiral ring groove 14 and the second ring groove 15. The tapered hole 13 of the connecting sleeve 7 will expand under the action of the high-pressure oil. At this time, the connecting flange 5 is pushed toward the rear end of the crankshaft 2, while the high-pressure oil is pressurized, and the connecting flange 5 is pushed until the connecting flange 5 is installed in place. At this time, the oil pressure is released, the tapered hole 13 shrinks, and the connecting sleeve 7 is inserted and installed at the output end of the crankshaft 2.

[0036] In this embodiment, the second annular groove 15 is a V-shaped annular groove. Of course, in other embodiments, the second annular groove 15 can also be a U-shaped annular groove, a rectangular annular groove, or a trapezoidal annular groove.

[0037] The thrust bearing 9 controls the axial movement of the crankshaft 2 and is lubricated by splashing lubricating oil. Unlike conventional thrust bearings, the thrust bearing 9 in this application is disc-shaped and internally provided with an oil delivery channel 19. One end face of the thrust bearing 9 includes an oil inlet channel 20 connecting to the input end of the oil delivery channel 19 and a first oil channel annular groove 21 connecting to the output end of the oil delivery channel 19. An oblique annular groove 22 is provided on the end face between the oil inlet channel 20 and the first oil channel annular groove 21. Lubricating oil can enter the first oil channel annular groove 21 through the oil delivery channel 19 for forced lubrication. Multiple second oil reservoirs 28 are provided between the first oil channel annular groove 21 and the oblique annular groove 22. These second oil reservoirs 28 communicate with the first oil channel annular groove 21 and the oblique annular groove 22 and are arranged in a spiral pattern. Furthermore, the other end face of the thrust bearing 9 includes a second oil channel annular groove 23 and multiple second oil reservoirs 28 connected to the second oil channel annular groove 23. The second oil storage tank 28 is used to increase oil storage to improve lubrication performance.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A high-load output structure of a special logistics diesel engine, comprising a cylinder block (1), a crankshaft (2), a flywheel housing (3), and a flywheel (4), characterized in that: The invention also includes a connecting flange (5), wherein the crankshaft (2) is installed in the cylinder block (1), the flywheel housing (3) is installed at the output end of the cylinder block (1), a bearing bushing (6) is provided in the center hole of the flywheel housing (3), the connecting flange (5) includes a connecting sleeve (7), a flange (8) located at one end of the connecting sleeve (7), the connecting sleeve (7) passes through the bearing bushing (6) and is sleeved on the output end of the crankshaft (2), the connecting sleeve (7) and the bearing bushing (6) are clearance-fitted, the flange (8) is connected to the flywheel (4), the flywheel (4) is located in the flywheel housing (3), a thrust bearing (9) sleeved on the outer wall of the crankshaft (2) is provided between the flywheel housing (3) and the cylinder block (1), and an oil storage mechanism is provided in the bearing bushing (6).

2. The high-load output structure of a special logistics diesel engine according to claim 1 is characterized in that: The oil storage mechanism comprises a plurality of first oil storage grooves (10) located on the inner wall of the bearing bushing (6), wherein a first oil hole (11) is provided in the first oil storage grooves (10).

3. The high-load output structure of a special logistics diesel engine according to claim 2 is characterized in that: A first annular groove (12) is provided on the inner wall of one end of the bearing bushing (6), and a plurality of evenly arranged second oil holes (25) are provided in the first annular groove (12).

4. The high-load output structure of a dedicated logistics diesel engine according to claim 1 is characterized in that: The bearing bushing (6) is installed in the center hole of the flywheel housing (3) through interference fit.

5. The high-load output structure of a special logistics diesel engine according to claim 1 is characterized in that: A tapered hole (13) is provided in the connecting sleeve (7), and a tapered surface is provided at the output end of the crankshaft (2). An interference fit connection is formed between the tapered hole (13) and the tapered surface.

6. The high-load output structure of a special logistics diesel engine according to claim 5, characterized in that: The taper of the tapered hole (13) is 1:

50.

7. The high-load output structure of a dedicated logistics diesel engine according to claim 5, characterized in that: The inner wall of the tapered hole (13) is provided with a spiral annular groove (14) and a second annular groove (15) connected to the spiral annular groove (14); a hydraulic channel (16) is provided inside the connecting sleeve (7); one end of the hydraulic channel (16) is connected to the second annular groove (15) through a hydraulic oil inlet (17); and the flange (8) is provided with a hydraulic oil joint installation port (18) connected to the hydraulic channel (16).

8. The high-load output structure of a special logistics diesel engine according to claim 1 is characterized in that: The thrust bearing (9) is disc-shaped, and an oil delivery passage (19) is provided inside the thrust bearing (9). An oil inlet passage (20) connected to the input end of the oil delivery passage (19) and a first oil passage annular groove (21) connected to the output end of the oil delivery passage (19) are provided on one end surface of the thrust bearing (9). An oblique annular groove (22) is provided on the end surface between the oil inlet passage (20) and the first oil passage annular groove (21).

9. The high-load output structure of a dedicated logistics diesel engine according to claim 8, characterized in that: The other end surface of the thrust bearing (9) is provided with a second oil channel annular groove (23).

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