An electronically controlled high-pressure common rail fuel pump with four cylinders arranged radially

Abstract

The present invention provides a four-cylinder radially arranged electronically controlled high-pressure common rail oil supply pump, including a pump body, a gear oil pump, a camshaft, a tappet body, an oil pump component, a proportional solenoid valve, an end cover component, a high-pressure pipe assembly, and a drive ring; the tappet body includes a roller, a roller cavity, and a tappet, and the oil pump components are four and radially symmetrically arranged, and the oil pump components include a plunger pair, an oil inlet valve, a plunger clamp ring, an oil outlet valve, a plunger spring, and a spring seat; the gear oil pump is arranged on the non-driving side of the pump body; the common rail pump is lubricated by engine oil, and a separate engine oil inlet and an engine oil return port are provided. The present invention has large flow, high speed, high working pressure, low driving torque, compact structure, convenient layout, and can meet the technical characteristics of high-power diesel engines.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine high pressure common rail fuel pumps, in particular to an electronically controlled high pressure common rail fuel pump with four cylinders arranged radially. Background Art

[0002] The use of high-pressure common rail fuel injection systems on diesel engines has become one of the main development trends in diesel engine technology in the world today. High-pressure common rail fuel injection systems can not only achieve stable high-pressure injection to improve the combustion process, but also independently control the injection characteristics, greatly improving the power, economy and emissions of diesel engines.

[0003] At present, the market demand for high-power, high-torque generators, ships, etc. is increasing. The greater the power of the diesel engine, the greater the flow rate of the high-pressure fuel pump is required. The traditional two-cylinder in-line or three-cylinder radial high-pressure fuel pumps can no longer meet the needs of higher-power diesel engines.

[0004] At present, high-pressure fuel supply pumps are divided into inline plunger pumps and radial rotor pumps according to mechanical principles. Inline plunger pumps require a larger installation space and are mainly used for low-speed and high-torque diesel engines. Radial rotor pumps have a small installation space and a high operating speed. Summary of the invention

[0005] The present invention provides a four-cylinder radially arranged electronically controlled high-pressure common rail oil supply pump, comprising a pump body, a gear-type oil delivery pump, a camshaft, a tappet body, an oil pumping component, a proportional solenoid valve, an end cover component, a high-pressure pipe assembly, and a drive ring; the tappet body comprises a roller, a roller cavity, and a tappet; there are four oil pumping components, which are radially symmetrically arranged; the oil pumping components comprise a plunger pair, an oil inlet valve, a plunger retaining ring, an oil outlet valve, a plunger spring, and a spring seat; the gear-type oil delivery pump is arranged on the non-driving side of the pump body; the common rail pump is lubricated by engine oil, and a separate engine oil inlet port and an engine oil return port are provided.

[0006] Furthermore, a double bearing is arranged on one side of the camshaft, and an annular groove is formed between the double bearings, the annular groove is communicated with the engine oil channel, and the engine oil can enter the annular groove between the double bearings through the engine oil inlet and the engine oil channel; a center hole is arranged on the camshaft, and a vertical hole intersecting with the center hole is arranged at the position of the annular groove; a first vertical hole and a second vertical hole intersecting with the center hole are arranged on the roller bearing and the axial center of the other side bearing of the camshaft, and the engine oil enters the vertical hole of the camshaft from the annular groove, flows to the center hole, and reaches the roller bearing and the bearing through the first vertical hole and the second vertical hole for lubrication.

[0007] Furthermore, a combination ring is installed below the plunger pair, and the combination ring consists of a sealing ring and an O-ring; the plunger pair is provided with an oil passage on the plunger cavity side of the combination ring, and the combination ring is connected to the low-pressure oil inlet of the oil inlet valve.

[0008] The invention has large flow, high rotation speed, high working pressure, low driving torque, compact structure, convenient arrangement, and can meet the technical characteristics of a high-power diesel engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG. 1 is a schematic diagram of the radial cross-sectional structure of the present invention.

[0010] FIG. 2 is a schematic diagram of the axial cross-sectional structure of the present invention.

[0011] FIG. 3 is a schematic diagram of the shaft side structure of the present invention.

[0012] FIG. 4 is a schematic diagram of the structure of the plunger assembly ring of the present invention.

[0013] FIG. 5 is a schematic diagram of the lubricating oil channel structure of the present invention.

[0014] FIG. 6 is a diagram of the present invention. Figure 5 Schematic diagram of the LL cross-section structure. DETAILED DESCRIPTION

[0015] refer to Figure 1 , 2 , 3, 4, 5 and 6;

[0016] A four-cylinder radially arranged electronically controlled high-pressure common rail oil pump, the axial parts of which are camshaft 3, end cover component 7, pump body 1, gear oil pump 2, camshaft 3 is installed in the middle of pump body 1, drive ring 9 is installed at the camshaft eccentric wheel, drive ring 9 is in contact with tappet roller 41, the outer side of the tappet body is matched with the tappet body hole of the pump body, and plunger spring 55 is installed inside. The camshaft rotates to drive the tappet body 4, and the pump oil component 5 completes the oil suction and oil pressure process together. The common rail pump adopts oil lubrication, with a separate oil inlet 11 and oil return port 12. The oil enters from the oil inlet 11, enters the annular groove 14 in the middle of the double bearings 13 through the oil channel 15, enters the camshaft center hole 16 from the annular groove, and then reaches the roller bearing 18 and the other side bearing 19 for lubrication.

[0017] In order to reduce the leakage of the plunger pair 51, the common rail pump is provided with a combination ring 10 at the bottom of the plunger pair 51. The combination ring 10 is composed of a sealing ring and an O-ring. The plunger pair 51 is provided with an oil passage 22 on the plunger cavity side of the combination ring 10, so that the combination ring 10 is communicated with the low-pressure oil inlet of the oil inlet valve to reduce the working pressure of the combination ring 10.

Claims

1. A four-cylinder radially arranged electronically controlled high-pressure common rail oil pump, Features: The invention comprises a pump body (1), a gear oil pump (2), a camshaft (3), a tappet body (4), an oil pump component (5), a proportional solenoid valve (6), an end cover component (7), a high-pressure pipe assembly (8), and a drive ring (9); the tappet body (4) comprises a roller (41), a roller cavity (42), and a tappet (43); the oil pump components (5) are in four radially symmetrical arrangements; the oil pump components (5) comprise a plunger pair (51), an oil inlet valve (52), a plunger card ring (53), an oil outlet valve (54), a plunger spring (55), and a spring seat (56); the gear type oil pump (2) is arranged on the non-driving side of the pump body (1); the camshaft (3) is installed in the middle of the pump body (1), a driving ring (9) is installed at the camshaft eccentric wheel, the driving ring (9) is in contact with the tappet body roller (41), the outer side of the tappet body is matched with the tappet body hole of the pump body, and the plunger spring (55) is installed on the inner side, the camshaft rotates to drive the tappet body (4), and the oil pump component (5) The oil suction and oil pressure process is completed together; the common rail pump is lubricated by engine oil, and a separate engine oil inlet (11) and an engine oil return port (12) are provided; a double bearing (13) is provided on one side of the camshaft (3); an annular groove (14) is formed between the double bearings (13); the annular groove (14) is communicated with an engine oil passage (15); the engine oil can enter the annular groove (14) between the double bearings (13) through the engine oil inlet (11) and the engine oil passage (15); the camshaft (3) is provided with a center hole (16); a vertical hole (17) intersecting with the center hole (16) is provided at the position of the annular groove (14); the camshaft (3) is provided with a roller bearing (18) and a vertical hole (17) intersecting with the center hole (16); A first vertical hole (20) and a second vertical hole (21) intersecting the center hole (16) are provided at the axial center of the bearing (19) on the other side. The engine oil enters the camshaft vertical hole (17) through the annular groove (14), flows to the center hole (16), and reaches the roller bearing (18) and the bearing (19) through the first vertical hole (20) and the second vertical hole (21) for lubrication. A combination ring (10) is installed below the plunger pair (51). The combination ring (10) is composed of a sealing ring and an O-ring. The plunger pair (51) is provided with an oil passage (22) on the plunger cavity side of the combination ring (10). The combination ring (10) is communicated with the low-pressure oil inlet of the oil inlet valve (52).

Images