CN105134440A - Single-cylinder high-pressure oil pump assembly of improved structure for diesel engine - Google Patents

Abstract

The invention discloses a single-cylinder high-pressure oil pump assembly with an improved structure for a diesel engine, comprising an integral pump cover part, an oil inlet metering valve filter screen, an oil inlet metering valve, pump body parts, an end cover, a sliding vane type oil delivery pump, and a drive shaft , drive shaft bearing bush, thrust washer, roller bearing bush, roller, flange bearing seat, oil seal, flow limiting valve parts, oil return bolt and oil inlet bolt parts; It is a single-cam roller structure. The oil supply capacity of the high-pressure oil pump can be changed by changing the cam structure. The roller bearing bush is made of modified tetrafluoroethylene material, which has higher wear resistance. The roller bearing bush and the drive shaft bearing bush are connected through the hole on the drive shaft. Carry out forced diesel lubrication, increase the filter structure, improve the cleanliness of the product, reduce the failure rate, adopt the integral pump cover structure, improve the reliability of the high-pressure oil pump under extreme pressure, and independently process the mating surface, which reduces the processing difficulty and cost.

Description

Improved structure single cylinder high pressure oil pump assembly for diesel engine

technical field

The invention belongs to the field of automobile manufacturing, in particular to a matching device of a diesel engine, which is an oil supply part of a high-pressure common rail system.

Background technique

With the increasingly stringent emission regulations, the high-pressure common rail system has become the mainstream of diesel fuel injection systems. The high-pressure oil pump is a key component of the high-pressure common rail system, and its technical level directly determines the reliability, power and economy of the end product. Therefore, solving the oil supply stability, oil supply capacity, installability, and low processing cost of the high-pressure oil pump has become a problem that must be considered in product development.

Contents of the invention

The object of the present invention is to address the deficiencies of the prior art and provide an improved structure single-cylinder high-pressure oil pump assembly for diesel engines. The high-pressure oil pump has a simple and compact structure, low processing cost, convenient assembly, flexible matching, and stable oil supply.

The purpose of the present invention is achieved through the following technical solutions: an improved structure single-cylinder high-pressure oil pump assembly for diesel engines, which is characterized in that it includes an integral pump cover part, an oil inlet metering valve filter screen, an oil inlet metering valve, and a pump body Components, end covers, sliding vane oil pumps, drive shafts, drive shaft bearing bushes, thrust washers, roller bearing bushes, rollers, flange bearing housings, oil seals, restrictor valve parts, oil return bolts and oil inlet bolt parts;

Wherein, the integral pump cover part is composed of oil pipe joint seat, oil outlet valve spring, oil outlet valve steel ball, fastening screw plug, oil inlet valve block, oil inlet valve steel ball, oil inlet valve spring, oil inlet valve spring seat, plunger spring, plunger spring seat, plunger cap, plunger and integral pump cover; the oil inlet bolt part is composed of oil inlet bolt, oil inlet bolt filter screen and circlip for hole;

After the oil outlet valve spring and the oil outlet valve steel ball are placed in the middle hole of the oil pipe joint seat in sequence, they are connected to the integral pump cover through threads, and a cut-in sealing structure is used between the oil pipe joint seat and the integral pump cover to ensure that the oil outlet The valve steel ball is attached to the sealing seat surface on the integral pump cover through the oil outlet valve spring to form a seal; the oil inlet valve spring seat, oil inlet valve spring, oil inlet valve steel ball, and oil inlet valve block are placed in sequence After the integral pump cover, it is compressed by the fastening screw plug, and the fastening screw plug and the integral pump cover are connected by threads. The oil inlet valve block and the integral pump cover use a cut-in sealing structure. The oil valve spring is attached to the sealing seat surface on the oil inlet valve block to form a seal; after the interference fit between the plunger and the plunger cap is integrated, it is matched with the integral pump cover to form a pair; the plunger spring and the plunger The spring seat is placed between the integral pump cover and the plunger cap; install the roller and roller bushing on the cam of the drive shaft, respectively install the thrust washer and the drive shaft bushing on the drive shaft from both ends of the drive shaft, and place the The assembled drive shaft is put into the middle hole of the pump body part and the flange bearing seat; the flange bearing seat and the pump body part are fixedly connected; the flange bearing seat and the drive shaft are sealed by an oil seal; The oil pump is connected with the drive shaft through a key, and placed in the counterbore of the pump body parts, and fixed with the pump body parts; the end cover is covered on the outside of the sliding vane oil pump, and fixedly connected with the pump body parts; the oil inlet metering filter is set on the The front end of the oil inlet metering valve is fixedly connected with the pump body parts; the integral pump cover part is fixedly connected with the pump body parts; the filter screen of the oil inlet bolt is put into the oil inlet bolt, fixed with an elastic retaining ring through the hole, and connected with the pump body parts through threads Connection; the oil return bolt and the restrictor valve parts are respectively connected with the pump body parts through threads.

Further, the diesel oil entering the low-pressure chamber is filtered through the filter screen of the oil inlet bolt, and the diesel oil entering the high-pressure chamber is filtered twice by the filter screen of the oil inlet metering valve.

Further, an O-shaped sealing ring is used for sealing between the fastening screw plug and the integral pump cover; the O-shaped sealing ring is used for sealing between the flange bearing seat and the pump body parts; the O-shaped sealing ring is used for the end cover and the pump body parts O-ring seal; the integral pump cover part and the pump body part are sealed by O-ring.

Further, the drive shaft is a single cam roller structure.

Further, the material of the roller bearing bush is modified tetrafluoroethylene.

Further, the diesel oil is respectively introduced into between the drive shaft and the drive shaft bearing bush, and between the drive shaft and the roller bearing bush through the oil passage on the drive shaft for lubrication.

The beneficial effects of the present invention are:

1. The appearance structure of the present invention is simple and compact, and the required installation space is small, which is convenient for installation.

2. The structure of the parts of the present invention is simple, which greatly reduces the cost of raw materials and processing.

3. The present invention adopts an integral structure, which is firmer and more reliable, and improves the reliability of the high-pressure oil pump under extreme pressure.

4. The present invention prolongs the service life of wearing parts and reduces the probability of failure.

5. The present invention uses forced diesel oil lubrication, which is beneficial to the control of emission pollution.

Description of drawings

Fig. 1 is a structural main sectional view of the present invention;

Fig. 2 is a side sectional view of the structure of the present invention;

Fig. 3 is a sectional view of the integral pump cover;

Figure 4 is a cross-sectional view of the oil inlet bolt;

In Figure 1-2, 1 is the integral pump cover part, 2 is the oil inlet metering valve filter screen, 3 is the oil inlet metering valve, 4 is the pump body part, 5 is the end cover, 6 is the sliding vane oil delivery pump, 7 is Drive shaft, 8 is the drive shaft bearing bush, 9 is the thrust washer, 10 is the roller bearing bush, 11 is the roller, 12 is the flange bearing seat, 13 is the oil seal, 14 is the restrictor valve part, 15 is the oil return bolt, 16 is the inlet Oil bolt parts;

In Figure 3, 17 is the oil pipe joint seat, 18 is the oil outlet valve spring, 19 is the steel ball, 20 is the fastening screw plug, 21 is the oil inlet valve block, 22 is the oil inlet valve spring, and 23 is the oil inlet valve spring seat , 24 is a plunger spring, 25 is a plunger spring seat, 26 is a plunger cap, 27 is a plunger, and 28 is an integral pump cover;

Among Fig. 4, 29 is the oil inlet bolt, 30 is the filter screen of the oil inlet bolt, and 31 is the elastic retaining ring for the hole.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1-4, the present invention provides an improved structure single-cylinder high-pressure oil pump assembly for a diesel engine, including an integral pump cover part 1, an oil inlet metering valve filter screen 2, an oil inlet metering valve 3, a pump body part 4, an end Cover 5, sliding vane oil pump 6, drive shaft 7, drive shaft bearing bush 8, thrust washer 9, roller bearing bush 10, roller 11, flange bearing seat 12, oil seal 13, flow limiting valve part 14, oil return bolt 15 And the oil inlet bolt part 16;

Among them, the integral pump cover part 1 is composed of oil pipe joint seat 17, oil outlet valve spring 18, oil outlet valve steel ball 19-1, fastening screw plug 20, oil inlet valve block 21, oil inlet valve steel ball 19-1 2. Oil inlet valve spring 22, oil inlet valve spring seat 23, plunger spring 24, plunger spring seat 25, plunger cap 26, plunger 27 and integral pump cover 28; the oil inlet bolt part 16 is composed of The oil inlet bolt 29, the oil inlet bolt filter screen 30 and the hole circlip 31 are formed; the plunger cap 26 and the plunger 27 form the plunger assembly.

After the oil outlet valve spring 18 and the oil outlet valve steel ball 19-1 are sequentially put into the middle hole of the oil pipe joint seat 17, they are connected to the integral pump cover 28 through threads, and the space between the oil pipe joint seat 17 and the integral pump cover 28 is Using the cut-in sealing structure, the oil outlet valve steel ball 19-1 is attached to the sealing seat surface on the integral pump cover 28 by the spring force of the oil outlet valve spring 18 to form a seal; the oil inlet valve spring seat 23, The oil inlet valve spring 22, the oil inlet valve steel ball 19-2, and the oil inlet valve block 21 are placed in the integral pump cover 28 in sequence, and then tightened by the fastening screw plug 20, and the gap between the fastening screw plug 20 and the integral pump cover 28 is It is threaded and sealed with an O-ring, and a cut-in sealing structure is used between the oil inlet valve block 21 and the integral pump cover 28. The sealing seat surface on the oil valve block 21 fits together to form a seal; after the interference fit between the plunger 27 and the plunger cap 26 is integrated, it is matched with the integral pump cover 28 to form a pair; the plunger spring 24 and the plunger The spring seat 25 is placed between the integral pump cover 28 and the plunger cap 26; the roller 11 and the roller bearing bush 10 are installed on the cam of the drive shaft 7, and the thrust washer 9 and the drive shaft are respectively installed from both ends of the drive shaft 7. The bearing bush 8 is installed on the drive shaft 7, and the assembled drive shaft 7 is put into the middle hole of the pump body part 4 and the flange bearing seat 12; the flange bearing seat 12 and the pump body part 4 are fixed by screws, and the O-ring seal; flange bearing seat 12 and drive shaft 7 are sealed by oil seal 13; sliding vane oil pump 6 is connected with drive shaft 7 through a key, and placed in the counterbore of pump body part 4, and screwed It is fixed with the pump body part 4; the end cover 5 is covered on the outside of the sliding vane oil delivery pump 6, fixed with the pump body part 4 by screws, and sealed by an O-ring; the oil inlet metering filter 2 is set on the front end of the oil inlet metering valve 3 , and the pump body part 4 are fixed by screws and sealed by an O-ring; the integral pump cover part 1 and the pump body part 4 are fixed by screws and sealed by an O-ring; the oil inlet bolt filter 30 is put into the oil inlet bolt 29 Among them, the hole is fixed with a circlip 31 and connected with the pump body part 4 through threads; the oil return bolt 15 and the restrictor valve part 14 are respectively connected with the pump body part 4 through threads.

The high-pressure oil pump assembly of the present invention has a single plunger coupling structure, and the drive shaft 7 has a single-cam roller structure. By changing the cam structure, the oil supply capacity of the high-pressure oil pump can be changed. The roller bearing bush 10 is made of modified tetrafluoroethylene material, which has a higher Abrasion resistance, through the hole on the drive shaft 7, the roller bearing bush 10 and the drive shaft bearing bush 8 are forced to lubricate with diesel oil, the filter structure is added, the cleanliness of the product is improved, and the failure rate is reduced. The integral pump cover structure is adopted to improve the high-pressure oil pump. Reliability under extreme pressure, independent mating surface processing, reduces processing difficulty and cost.

The drive shaft 7 is a single-cam roller structure, and different cam structures can be designed according to different oil supply requirements, so as to realize different oil supply capabilities of the high-pressure oil pump. This design is simpler and more flexible than the double-cam camshaft structure Well, the processing cost is low.

The roller bearing bush 10 is made of modified tetrafluoroethylene material, which has high compressive strength, wear resistance, good heat conduction, small thermal expansion coefficient, will not stick to the bonding surface, can be stored for a long time, is not easy to age, and increases Product reliability and service life.

The single plunger coupler structure is to complete the oil supply through the cooperation of only one pair of plunger couplers with the drive shaft, the structure is simpler and more compact, and the cost is saved.

The forced diesel lubrication is to lubricate the diesel oil between the drive shaft 7 and the drive shaft bearing bush 8 and between the drive shaft 7 and the roller bearing bush 10 respectively through the oil passage on the drive shaft 7 .

The filter structure is to filter the diesel oil entering the low-pressure chamber through the oil inlet bolt filter screen 30, and filter the diesel oil entering the high-pressure chamber through the oil inlet metering valve filter screen 2, so as to improve the cleanliness of the diesel oil and reduce the damage of parts. The failure rate prolongs the service life of each workpiece.

The integral pump cover structure, that is, the split high-pressure pump cover and the plunger sleeve are integrated, the structure is more stable, and the transition connection between parts is reduced. Safe and reliable.

The working principle of the present invention is:

The engine drives the drive shaft 7 to rotate, and the drive shaft 7 drives the sliding vane oil delivery pump 6 to run through the key; after the diesel oil is filtered through the oil inlet bolt filter screen 30 in the oil inlet bolt part 16, it enters the sliding vane through the oil passage on the pump body part 4. In the vane type fuel pump 6, after the diesel oil is pressurized by the sliding vane type fuel pump 6, part of the oil circuit on the pump body part 4 is introduced into the restrictor valve part 14 and the inner cavity of the pump body part 4, and the other part passes through the oil inlet metering valve. After being filtered by the filter screen 2, it enters the oil inlet metering valve 3; the electric signal input from the outside controls the opening of the oil inlet metering valve 3, and the diesel oil enters the integral pump cover part 1 through the oil circuit on the pump body part 4. At this time, the plunger assembly is controlled The spring force of the plunger spring 24 follows the drive shaft 7 down, the oil inlet steel ball 19-2 is opened, and the diesel oil enters the volume chamber at the top of the plunger 27 through the oil passage on the integral pump cover 28 and the oil inlet valve block 21; The drive shaft 7 pushes the plunger assembly upward, the oil inlet steel ball 19-2 closes to form a seal with the seat surface of the oil inlet valve block 21, the pressure in the volume cavity at the top of the plunger 27 rises, and the oil outlet valve steel ball 19-1 opens , the diesel oil enters the oil pipe through the oil pipe joint seat 17 to complete a fuel supply cycle; when the pressure before the valve of the oil inlet metering valve 3 reaches the opening pressure of the flow limiting valve part 14, the diesel oil returns to the oil inlet end through the flow limiting valve part 14; the high pressure oil pump The lubricating method is diesel oil lubrication, diesel oil is introduced into the inner chamber of the pump body part 4 through the sliding vane oil delivery pump 6, and the diesel oil entering the inner chamber of the pump body returns to the fuel tank through the oil return bolt 15.

The invention is applied in the fuel common rail system of light vehicles, can flexibly match engines below 70KW, and the fuel supply efficiency can reach 85%.

Claims (6)

1. use for diesel engine modified node method single cylinder high-pressure fuel injection pump assembly, it is characterized in that, comprise integral pump cover (1), inlet metering valve filter screen (2), inlet metering valve (3), pump parts (4), end cap (5), vane fuel supply pump (6), live axle (7), live axle bearing shell (8), thrust washer (9), roller bearing shell (10), roller (11), flange shaft bearing (12), oil sealing (13), flow-limiting valve parts (14), oil return bolt (15) and oil-feed bolt member (16);

Wherein, described integral pump cover (1) is made up of oil connection seat (17), oil outlet valve spring (18), outlet valve steel ball (19-1), fastening screw plug (20), oiling valve block (21), oiling valve steel ball (19-2), oiling valve spring (22), oiling valve spring seat (23), piston spring (24), piston spring seat (25), piston cap (26), plunger (27) and overall pump cover (28); Described oil-feed bolt member (16) is made up of oil-feed bolt (29), oil-feed bolt filter screen (30) and circlip for hole (31);

After the mesopore of oil connection seat (17) put into successively by described oil outlet valve spring (18), outlet valve steel ball (19-1), be connected with overall pump cover (28) by screw thread, cut-in type sealing configuration is used between oil connection seat (17) and overall pump cover (28), outlet valve steel ball (19-1) is fitted by oil outlet valve spring (18) and the sealed seat surface on overall pump cover (28), forms sealing; After described oiling valve spring seat (23), oiling valve spring (22), oiling valve steel ball (19-2), oiling valve block (21) put into overall pump cover (28) successively, compressed by fastening screw plug (20), be threaded connection between fastening screw plug (20) and overall pump cover (28), cut-in type sealing configuration is used between oiling valve block (21) and overall pump cover (28), oiling valve steel ball (19-2) is fitted by oiling valve spring (22) and the sealed seat surface on oiling valve block (21), forms sealing; After interference fit becomes to be integrated between plunger (27) with piston cap (26), match with overall pump cover (28) and become couple; Piston spring (24) and piston spring seat (25) are placed between overall pump cover (28) and piston cap (26); Roller (11), roller bearing shell (10) are contained on the cam of live axle (7), from the two ends of live axle (7), thrust washer (9), live axle bearing shell (8) are installed to live axle (7) respectively, the live axle (7) after assembling is put into the mesopore of pump parts (4) and flange shaft bearing (12); Be fixedly connected with between flange shaft bearing (12) with pump parts (4); Sealed by oil sealing (13) between flange shaft bearing (12) and live axle (7); Vane fuel supply pump (6) is connected with live axle (7) by key, and is placed in the counterbore of pump parts (4), fixes with pump parts (4); End cap (5) covers on vane fuel supply pump (6) outside, is fixedly connected with pump parts (4); Inlet metering filter screen (2) is enclosed within inlet metering valve (3) front end, is fixedly connected with pump parts (4); Integral pump cover (1) is fixedly connected with pump parts (4); Oil-feed bolt filter screen (30) puts into oil-feed bolt (29), is fixed, be connected by screw thread with pump parts (4) by circlip for hole (31); Oil return bolt (15) is connected with pump parts (4) respectively by screw thread with flow-limiting valve parts (14).

2. a kind of use for diesel engine modified node method single cylinder high-pressure fuel injection pump assembly according to claim 1, it is characterized in that, filtered the diesel oil entering low-pressure cavity by oil-feed bolt filter screen (30), inlet metering valve filter screen (2) carries out secondary filter to the diesel oil entering hyperbaric chamber.

3. a kind of use for diesel engine modified node method single cylinder high-pressure fuel injection pump assembly according to claim 1, is characterized in that, uses O-ring seals to seal between described fastening screw plug (20) and overall pump cover (28); Sealed by O-ring seals between flange shaft bearing (12) and pump parts (4); End cap (5) and pump parts (4) are sealed by O-ring seals; Integral pump cover (1) and pump parts (4) are sealed by O-ring seals.

4. a kind of use for diesel engine modified node method single cylinder high-pressure fuel injection pump assembly according to claim 1, is characterized in that, described live axle (7) is single tappet roller structure.

5. a kind of use for diesel engine modified node method single cylinder high-pressure fuel injection pump assembly according to claim 1, is characterized in that, the material of described roller bearing shell (10) is modification tetrafluoroethylene.

6. a kind of use for diesel engine modified node method single cylinder high-pressure fuel injection pump assembly according to claim 1, it is characterized in that, diesel oil imported respectively live axle (7) and live axle bearing shell (8) by the upper oil circuit of live axle (7), lubricate between live axle (7) and roller bearing shell (10).