CN101539086A - Assembly piston of single-cylinder small-bore high speed diesel engine - Google Patents
Assembly piston of single-cylinder small-bore high speed diesel engine Download PDFInfo
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- CN101539086A CN101539086A CN200910097330A CN200910097330A CN101539086A CN 101539086 A CN101539086 A CN 101539086A CN 200910097330 A CN200910097330 A CN 200910097330A CN 200910097330 A CN200910097330 A CN 200910097330A CN 101539086 A CN101539086 A CN 101539086A
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Abstract
The invention discloses an assembly piston of a single-cylinder small-bore high speed diesel engine, which comprises a piston arranged in a piston sleeve. A delivery valve seat is arranged on the upper part of an inner cavity of the piston sleeve, wherein, a starting fuel slot for changing the fuel supply quantity in starting and a pre-spray slit which can change the fuel supply advance angle of the fuel injection pump are arranged at the periphery of a lower end head of the piston; the pre-spray slit is parallel with the upper end surface of the piston; the upper end head of the piston is provided with an fuel interruption slot which extends downwards; a control fuel slot from the inclined upper part of the starting fuel slot to the fuel interruption slot is arranged at the periphery of he upper end head of the piston. With the starting fuel limitation slot being added, the fuel supply quantity can be changed in starting, and the fuel quantity and the black smoke phenomenon are limited in high power working. With the pre-spray slit being added, the fuel supply characteristic that is slow early and fast late is realized.
Description
Technical field
The present invention relates to the little cylinder diameter high-speed diesel engine of single cylinder manufacturing technology, relate in particular to a kind of assembly piston of single-cylinder small-bore high speed diesel engine.
Background technique
The diesel engine of relating to twin-tub unit fuel injection pump is arranged in the prior art, and its structure comprises plane tappet, the pump housing, flange-type housing part, delivery valve matching parts, oil outlet valve spring, delivery valve holder, plunger coupled parts, piston spring, bleed screw, fuel inlet fitting assembly, location card reed; Wherein plunger coupled parts is made up of plunger bushing and plunger, is added with fuel feeding pretravel between flange-type housing part and the pump housing upper-end surface and adjusts pad; The bolt that is loaded on the pump housing is fixed the flange-type housing part and the pump housing by kidney slot; It is applicable to the high speed direct injection diesel engine; fuel saving; help environmental protection; make the miniaturization of little cylinder diameter two cylinder diesel engine, speed up, straight sprayization; and replace the petrol engine of equal volume and power to become possibility, and diesel engine all is better than petrol engine at aspects such as power character, Economy, obstacle climbing ability and environmental protection.But it can't be suitable for the little cylinder diameter high-speed diesel engine of single cylinder.The little cylinder diameter high-speed diesel engine of single cylinder also is most important parts in the oil-fired system, and its function is to improve fuel pressure, according to the requirement of diesel engine condition, a certain amount of fuel oil is supplied with oil sprayer spray into the firing chamber in correct time.Single cylinder diesel is mainly the requirement of Injection Pump: the fuel delivery of Injection Pump should satisfy the needs of diesel engine under various operating modes, loads promptly that fuel delivery increases when big, and load hour fuel delivery reduces; Different with the method that mixed gas forms according to combustion-chamber shape, Injection Pump must provide pressure sufficiently high fuel oil to oil sprayer, to guarantee good atomization quality.Above-mentioned technological scheme lacks to start limits oil groove, can not change fuel delivery when starting, thereby can't accomplish to place restrictions on oil mass when high power work, and easily cause the over-emitting black exhaust phenomenon; Finally cause fuel consumption rate height, effect to be discharged than reducing, be unfavorable for to reduce.
Summary of the invention
Technical problem to be solved by this invention is the present situation at prior art, and a kind of assembly piston of single-cylinder small-bore high speed diesel engine that can reduce fuel consumption rate, raising power and help reducing discharging is provided.
The present invention solves the problems of the technologies described above the technological scheme that is adopted: assembly piston of single-cylinder small-bore high speed diesel engine, comprise the plunger that is assemblied in the plunger bushing, delivery valve seat is positioned at the top of plunger bushing inner chamber, and wherein: plunger upper tip periphery is shaped on startup oil groove that changes fuel delivery when being used to start and the pre-spray slit that can change the fuel supply advance angle of Injection Pump; Pre-spray slit is parallel with the plunger upper-end surface; The plunger upper tip is shaped on the oil-break groove of downward extension; Plunger upper end head periphery also is shaped on by starting the control oil groove of the oblique top of oil groove to the oil-break groove.
The technical measures of taking also comprise:
Plunger bushing and pad, connecting plate are equipped with first locating stud; The plunger lower end is with the fuel control sleeve parts; Plunger bushing lower end shock mount support, and equipped with second locating stud; The plunger bushing lower end is equipped with piston spring, spring lower seat successively, the body of holding out; Plunger bushing inner chamber upper end is equipped with gasket seal successively, is equipped with delivery valve seat, gasket seal, the oil outlet valve spring of outlet valve, and with the delivery valve holder screw-thread fit; The fuel inlet fitting parts be with O-ring seals and with the plunger bushing interference fit.
Compared with prior art, head is shaped on startup limit oil groove and the pre-slit that sprays on the plunger of the present invention.After increasing startup limit oil groove, can when starting, change fuel delivery, when high power work, place restrictions on oil mass and over-emitting black exhaust phenomenon.After increasing pre-spray slit, realized the anxious characteristic of fuel delivery in first slow back, promptly can not change the fuel supply advance angle of Injection Pump simultaneously, thereby reduced fuel consumption rate, improve power, help reducing discharging along with the rotating speed of diesel engine.
Description of drawings
Fig. 1 is the composite structure cross-sectional schematic that the embodiment of the invention is used;
Fig. 2 is Fig. 1 schematic top plan view;
Fig. 3 is that partial schematic diagram is looked on Fig. 1 left side;
Fig. 4 is arranged in Fig. 1 embodiment of the invention enlarged diagram;
Fig. 4 A is the schematic top plan view among Fig. 4;
Fig. 4 B is the partial schematic diagram that head is looked on the left side among Fig. 4;
Fig. 4 C is the partial schematic sectional view among Fig. 4 B.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Shown in Fig. 1-Fig. 4 C, assembly piston of single-cylinder small-bore high speed diesel engine, comprise the outlet valve 52 that is assemblied on the delivery valve seat 51, be assemblied in the plunger 72 in the plunger bushing 71, delivery valve seat 51 is positioned at the top of plunger bushing 71 inner chambers, and wherein: plunger bushing 71 is equipped with pad 15, connecting plate 14 usefulness second locating stud 13; Plunger 72 lower ends are with fuel control sleeve parts 8; Plunger bushing 71 lower end shock mount supports 9, and equipped with second locating stud 13; Plunger bushing 71 lower ends are equipped with piston spring 10, spring lower seat 11 successively, the body 12 of holding out; Plunger bushing 71 inner chambers upper ends is equipped with gasket seal 6 successively, is equipped with delivery valve seat 51, gasket seal 4, the oil outlet valve spring 3 of outlet valve 52, and with delivery valve holder 2 screw-thread fit; Fuel inlet fitting parts 16 be with O-ring seals 17 and with plunger bushing 71 interference fit; Plunger 72 upper tip peripheries are shaped on startup oil groove 72a that changes fuel delivery when being used to start and the pre-spray slit 72b that can change the fuel supply advance angle of Injection Pump.Pre-spray slit 72b is parallel with plunger 72 upper-end surfaces; Plunger 72 upper tips are shaped on the oil-break groove 72d of downward extension; Plunger 72 upper end head peripheries also are shaped on by starting the control oil groove 72c of the oblique top of oil groove 72a to oil-break groove 72d.Delivery valve holder 2 is set with delivery connection helmet 1.Fuel inlet fitting parts 16 filler openings are set with fuel inlet fitting helmet 18.
Assembly process:
Working principle:
Injection Pump provides pressure sufficiently high fuel oil to oil sprayer, is an oil suction and the process of pressing oil, and it is to be finished by the to-and-fro motion of plunger 72 in plunger bushing 71.When plunger 72 upper-end surfaces were positioned at plunger bushing 71 oil inlet hole lower ends, the oil duct in plunger bushing 71 and the diesel engine communicated, and fuel oil is filled with the grease chamber rapidly.When cam pushes up when holding out body 12, plunger 72 just rises.Till before beginning to move upward to plunger bushing 71 oil inlet holes and blocked by plunger 72 upper-end surfaces from plunger 72, at this section in the period, because the motion of plunger 72, fuel oil is extruded from the grease chamber, flows to oil duct.When plunger 72 blocks plunger bushing 71 oil inlet holes, just begin to press oily process.Plunger 72 is up, and oil pressure sharply raises in the grease chamber.When pressure surpasses the spring force of oil outlet valve spring 3 and top oil pressure, just back down outlet valve 51, fuel oil is pressed into high-pressure oil pipe delivers to oil sprayer.When plunger 72 continues to move upward, fuel feeding is also continuing always, till pressing oily process to last till when control oil groove limit on the plunger 72 gets out of the way plunger bushing 71 oil inlet holes, when oilhole one is opened, high pressure oil is oil-break groove on plunger 72 and plunger bushing 71 oil inlet holes from the grease chamber just, and play the spill port effect and flow in the oil duct this moment.This moment, the oil pressure of plunger bushing 71 grease chambeies reduced rapidly, outlet valve 51 oil pressure effect in the spring force of oil outlet valve spring 3 and high-pressure oil pipe delivery valve seat 52 that falls back, and oil sprayer stops oil spout immediately.
In order to adapt to the requirement of diesel engine load, the fuel delivery of Injection Pump must be regulated in zero fuel delivery scope at maximum fuel delivery.The adjusting of fuel delivery is rotated plunger 72 by fuel control sleeve parts 8 and is realized.When plunger 72 rotated, fuel feeding began constant, and fuel feeding finish-time, then because plunger 72 is controlled the oil groove limits that the change of plunger bushing 71 oil inlet hole positions has been changed.Along with the angle difference that plunger 72 rotates, the effective travel of plunger 72 is also just different, thereby fuel delivery also changes thereupon.
Claims (2)
1, assembly piston of single-cylinder small-bore high speed diesel engine, comprise the plunger (72) that is assemblied in the plunger bushing (71), it is characterized in that: described plunger (72) upper tip periphery is shaped on startup oil groove (72a) that changes fuel delivery when being used to start and the pre-spray slit (72b) that can change the fuel supply advance angle of Injection Pump; Described pre-spray slit (72b) is parallel with described plunger (72) upper-end surface; Described plunger (72) upper tip is shaped on the oil-break groove (72d) of downward extension; Plunger (72) upper end head periphery also is shaped on by starting the control oil groove (72c) of the oblique top of oil groove (72a) to oil-break groove (72d).
2, assembly piston of single-cylinder small-bore high speed diesel engine according to claim 1 is characterized in that: described plunger bushing (71) is equipped with first locating stud (19) with pad (15), connecting plate (14); Described plunger (72) lower end is with fuel control sleeve parts (8); Plunger bushing (71) lower end shock mount support (9), and equipped with second locating stud (13); Described plunger bushing (71) lower end is equipped with piston spring (10), spring lower seat (11), the body of holding out (12) successively; Plunger bushing (71) inner chamber upper end is equipped with gasket seal (6) successively, is equipped with delivery valve seat (51), gasket seal (4), the oil outlet valve spring (3) of outlet valve (52), and with delivery valve holder (2) screw-thread fit; Fuel inlet fitting parts (16) be with O-ring seals (17) and with plunger bushing (71) interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910097330A CN101539086A (en) | 2009-04-09 | 2009-04-09 | Assembly piston of single-cylinder small-bore high speed diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910097330A CN101539086A (en) | 2009-04-09 | 2009-04-09 | Assembly piston of single-cylinder small-bore high speed diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101539086A true CN101539086A (en) | 2009-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910097330A Pending CN101539086A (en) | 2009-04-09 | 2009-04-09 | Assembly piston of single-cylinder small-bore high speed diesel engine |
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| Country | Link |
|---|---|
| CN (1) | CN101539086A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103835852A (en) * | 2012-11-24 | 2014-06-04 | 韩行夫 | High-pressure oil pump plunger |
| CN108150328A (en) * | 2017-12-25 | 2018-06-12 | 南岳电控（衡阳）工业技术股份有限公司 | A kind of high-power monomer pump plunger |
| CN110067653A (en) * | 2019-04-03 | 2019-07-30 | 陕西渭阳动力技术服务有限责任公司 | A kind of parking device |
| CN112761839A (en) * | 2021-01-28 | 2021-05-07 | 长江武汉航道工程局 | Plunger coupling piece of obtuse-angle oil groove of high-pressure oil pump |
-
2009
- 2009-04-09 CN CN200910097330A patent/CN101539086A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103835852A (en) * | 2012-11-24 | 2014-06-04 | 韩行夫 | High-pressure oil pump plunger |
| CN103835852B (en) * | 2012-11-24 | 2017-02-08 | 韩行夫 | High-pressure oil pump plunger |
| CN108150328A (en) * | 2017-12-25 | 2018-06-12 | 南岳电控（衡阳）工业技术股份有限公司 | A kind of high-power monomer pump plunger |
| CN110067653A (en) * | 2019-04-03 | 2019-07-30 | 陕西渭阳动力技术服务有限责任公司 | A kind of parking device |
| CN112761839A (en) * | 2021-01-28 | 2021-05-07 | 长江武汉航道工程局 | Plunger coupling piece of obtuse-angle oil groove of high-pressure oil pump |
| CN112761839B (en) * | 2021-01-28 | 2021-11-23 | 长江武汉航道工程局 | Plunger coupling piece of obtuse-angle oil groove of high-pressure oil pump |
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Application publication date: 20090923 |