CN1292165C - Fuel jet pump - Google Patents
Fuel jet pump Download PDFInfo
- Publication number
- CN1292165C CN1292165C CN 03127578 CN03127578A CN1292165C CN 1292165 C CN1292165 C CN 1292165C CN 03127578 CN03127578 CN 03127578 CN 03127578 A CN03127578 A CN 03127578A CN 1292165 C CN1292165 C CN 1292165C
- Authority
- CN
- China
- Prior art keywords
- camshaft
- timer
- fuel
- injection pump
- shell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000000446 fuel Substances 0.000 title abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 51
- 239000007924 injection Substances 0.000 claims abstract description 51
- 238000007789 sealing Methods 0.000 claims description 40
- 238000002485 combustion reaction Methods 0.000 claims description 23
- 230000004323 axial length Effects 0.000 abstract description 13
- 239000000314 lubricant Substances 0.000 description 8
- 238000010304 firing Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 241000487918 Acacia argyrodendron Species 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 235000011222 chang cao shi Nutrition 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
- High-Pressure Fuel Injection Pump Control (AREA)
Abstract
To reduce the total length of a fuel injection pump by giving special design to the shapes of an oil seal and a timer. A lip 62 of the oil seal 6 extends to the outside (the right side of the figure) of a housing 4, namely to the side of the timer 2, as shown in the figure, and a recessed portion 21a located coaxially with a cam shaft 3 and opening to the side of the housing 4 is provided on the end face of a timer hub 21 at the side of the housing 4. The lip 62 is stored in the recessed portion 21a, whereby the length of the oil seal 6, namely the axial length of a ring 61, is reduced, the axial length of a bearing cover 5 is reduced and the total length of the fuel injection pump 1 is reduced, while a gap G between the timer hub 21 and the bearing cover 7 is kept equal in size to that in a conventional fuel injection pump. (C)2004,JPO.
Description
Technical field
The present invention relates to a kind of fuel-injection pump that in internal-combustion engine, uses.
Background technique
The fuel-injection pump that loads in the internal-combustion engine sucks the fuel in the fuel tank and makes its high-pressure trend, and force feed is to the Fuelinjection nozzle that is installed in the internal-combustion engine.And then Fuelinjection nozzle is ejected into fuel under high pressure in the firing chamber of internal-combustion engine.
On January 15th, 1994 also disclosed a kind of fuel-injection pump with the elegant male title of creating of black wood in the books of " transportation diesel " Japanese publication by straight under the palace, this fuel-injection pump has: by the camshaft of the drive shaft of internal-combustion engine, be connected in and make the timer ( イ マ) of camshaft between live axle and the camshaft with respect to the angle variation of live axle, keep camshaft to make its rotary shell, periphery is fixed in the interior week of end, while of shell and the oil sealing of the outer circumferential face sliding contact of camshaft.In the shell, the maintenance piston has been installed and has been made its slidably cylinder, thereby made reciprocating motion of the pistons make fuel high pressureization by the rotation of camshaft.And in shell, the lubricant oil that uses for the bearing lubrication of the slide part of the cam that makes camshaft and piston and camshaft circulates.Above-mentioned oil sealing, the lubricant oil that prevents to supply with camshaft drain to enclosure, keep the tightness of enclosure.
Timer is connected between the live axle and camshaft of internal-combustion engine, by change camshaft with respect to live axle, be the relative angle of the bent axle of internal-combustion engine, adjust time by Fuelinjection nozzle burner oil in the firing chamber.The time of burner oil in the firing chamber, the output performance of internal-combustion engine and the composition of discharge gas are had a significant impact.
In recent years, require more and more stricter for the purification that prevents the pollution of the environment for the exhaust of internal-combustion engine.Simultaneously, require to realize reduce fuel consumption, promptly to improve fuel firing rate also more and more stronger.For satisfying these requirements, must make the pressure high-pressure trend of burner oil in the firing chamber and the time optimization of burner oil in the firing chamber.By the high-pressure trend of fueling injection pressure, utilize the injected fuel spray pelletizing, make its perfect combustion, thereby can suppress to discharge the black smoke in the gas.Simultaneously, can reduce content of discharging the harmful matter (nitrogen oxides, hydrocarbon etc.) in the gas and the fuel injection time that improves fuel firing rate, according to the rotational velocity of internal-combustion engine and load and difference.So, find best fuel injection time be exactly by timer according to the rotating speed of internal-combustion engine and load and trickle, control fuel injection time accurately.
But, in case, just increased the driving torque of fuel-injection pump with the fueling injection pressure high-pressure trend.That is,, be the stability that the fuel injection time of guaranteeing timer is controlled, must increase the control force of timer because increased the transmitting torque of timer.Because the control force of timer relies on the centrifugal force that acts on the counterweight that is built in wherein, then must increase the counterweight weight of timer for the control force that increases timer, promptly to increase the volume (external diameter, length) of timer.When the increase of timer volume, when particularly the timer total length is elongated, the total length of fuel-injection pump increases, and loads fuel-injection pump and become difficult on internal-combustion engine.
As countermeasure, considered for example to reduce gap between timer and the shell, be about to the method for timer near shell, but on each part dimension precision difficulty relatively.
Summary of the invention
The purpose of this invention is to provide a kind ofly overcome the above problems, having done effort in shape, can shorten the fuel-injection pump of total length at oil sealing and timer.
For achieving the above object, fuel-injection pump of the present invention has the recess of opening to shell one side on the end face of the shell side of timer, oil sealing to timer one side shaft in extending to recess.Generally, thus oil sealing has with what materials such as metal were made and is pressed into the bubble-tight rim that is fixed on the ring in the shell and keeps enclosure with the outer circumferential face sliding contact of interior Zhou Eryu rotatingshafts that make, that be fixed on ring such as rubber.In order to be pressed into shell easily and to keep the form of oil sealing with respect to rotatingshaft, the ring of oil sealing has predetermined axial length.And the shape of the sliding contacting part of rim and rotatingshaft becomes the circular of minute widths.In the fuel-injection pump in the past, oil sealing is directly installed on the end of shell or is installed in miscellaneous part, for example, keeps being fixed on coaxially on the bearing cap on the shell with the bearing of bearing and with camshaft as camshaft.Herein, the bearing cap of oil sealing and camshaft is installed on the shell of fuel-injection pump with being separated by minimal axial clearance, and the end face of the axial end of oil sealing and shell or bearing cap end face isoplanar almost.That is, the rim of oil sealing and the sliding contacting part of camshaft are formed on enclosure one side of the axial end of relative oil sealing.
For further shortening the entire axial length of fuel-injection pump, consider to shorten the axial length of oil sealing.About the axial length of ring, can shorten to necessary minimal length, the minimal length of this necessity is being pressed into operation and keeping the form of oil sealing with respect to rotatingshaft in order to keep being pressed in the shell.Yet, just shortening the axial length that encircles, bearing will be interfered with rim.Therefore, with respect to the axial end of oil sealing with rim to the shell outside, be that timer one side is extended, in an original opposite side, be the sliding contacting part that timer one side that the oil sealing axial end rises forms rim and camshaft, so just can shorten the length of ring.But so talk about, rim is interfered with timer again.
Therefore, on the end face of the shell side of timer, designed recess coaxially, in this recess, held above-mentioned rim simultaneously to shell one side opening with camshaft.Like this, as the past, guarantee the gap between timer and the shell, can also shorten the total length of fuel-injection pump simultaneously.
In the fuel-injection pump of the present invention, oil sealing is made of following member: directly or by miscellaneous part be fixed on the ring of outer casing end and be fixed on that ring is gone up and constitute with the rim of camshaft sliding contact, the member that extends in the recess on the oil sealing is a rim.Like this, kept oil sealing, be rim and camshaft contact condition that in other words the seal of oil sealing the time, the bearing of trend of change rim can shorten the axial length of ring, thus the entire length of the fuel-injection pump that contracted.
Description of drawings
Fig. 1 is the partial sectional view that the 1st embodiment's of the present invention fuel-injection pump is shown.
Fig. 2 is the partial sectional view that the 2nd embodiment's of the present invention fuel-injection pump is shown.
Embodiment
Below, be applicable to the situation of the diesel engine usefulness fuel-injection pump of the fuel-injection pump that on vehicle loadings is involved in the present invention according to figure explanation.
The 1st embodiment
As shown in Figure 1, fuel-injection pump 1 has: be situated between by bearing 7 will drive shell 4 that camshaft 3 that the live axle 11 of usefulness drives keeps by the fuel-injection pump 1 of internal-combustion engine 10 free to rotately, be fixed on camshaft 3 one ends and be connected live axle 11 and camshaft 3 between and can change the timer 2 of camshaft 3 with respect to the rotation relative angle of live axle 11, at the outside of the bearing 7 of shell 4 and the oil sealing 6 that camshaft 3 is installed coaxially.
Be installed in the gear 22 on the timer 2, be meshed with gear (not shown) on the live axle 11 that is installed in internal-combustion engine 10, the torque of live axle 11 is situated between and is delivered to camshaft 3 by these gears 22 and timer 2, and camshaft 3 is rotated.Be driven by gear etc. because this live axle 11 is situated between by the bent axle (not shown) of internal-combustion engine 10, camshaft 3 is driven with its same period by the bent axle (not shown) of internal-combustion engine 10 and rotates.
Bearing 7 is used to keep camshaft 3 and makes it free to rotate, has used roller bearing in fuel-injection pump 1.And when the inside diameter of bearing 7 was pressed into camshaft 3, the outer diameter part of bearing 7 was embedded into bearing cap 5.And then this bearing cap 5 is fixed on the shell 4 by bolt 8, keeps camshaft 3 freely to rotate on shell 4.Like this, bearing 7 need not be directly installed on the shell 4, but, improve the operability of changing bearing 7 work such as grade by the structure that bearing cap 5 is installed.
Shell 4, make by for example aluminum casting spare (cast producing material), when keeping camshaft 3 to make it free to rotate, the cylinder (not shown) that makes fuel high pressureization with the piston (not shown) and the maintenance piston of member it can be slided with the same number of conduct of this cylinder of internal combustion engine is installed.By the rotation of camshaft 3, thereby make reciprocating motion of the pistons make fuel high pressureization.And in the cam chamber 41 of the placement camshaft 3 of shell 4, the lubricant oil that keeps the slide part of camshaft lubrication 3 and piston (not shown) and bearing 7 usefulness is at prearranging quatity.This lubricant oil, for example the part of the lubricant oil of internal-combustion engine (not shown) is supplied to, and shell 4 is provided with lubricant oil supply hole (not shown) and tap hole (not shown), and the lubricant oil in the shell 4 is constantly circulation in internal combustion engine operation.
Oil sealing 6 is to be used to prevent that the above-mentioned lubricant oil of passing to camshaft 3 from draining to shell 4 outsides, keeping bubble-tight in the shell 4.Oil sealing 6 has by metal etc. makes, is pressed into ring 61 on interior week of bearing cap 5, and makes, is fixed in the interior week of ring 61 and the rim 62 of camshaft 3 outer circumferential face sliding contacts by rubber etc.For the oil sealing 6 of above-mentioned fuel-injection pump 1, ring 61 can be made the steel plate punch process, and rim 62 can be made with wear resistance, heat resistance, rubber material that oil resistance is good simultaneously.In the oil sealing 6 of this fuel-injection pump 1, be to shorten the total length of fuel-injection pump 1, the oil sealing of fuel-injection pump has more in the past shortened and has encircled 61 axial length.Simultaneously, the oil sealing of the bearing of trend of rim 62 fuel-injection pump more in the past changes.Promptly, in the oil sealing of fuel-injection pump in the past, be that rim is stretched out to the inboard (left side of Fig. 1) of shell 4 and to the surface tilt of camshaft 3, the sliding contacting part of rim and camshaft, be formed on oil sealing 6 axial end, be that the end face of bearing cap is to enclosure one side.Relative therewith, in the oil sealing 6 in the present embodiment,, as shown in Figure 1, rim 62 is extended the outside (right side of Fig. 1) to shell 4, is a side of timer 2 for avoiding it being the interference of avoiding with guard ring 71 with the interference of bearing 7, concretely.Thereupon, the contacting part of rim 62 and camshaft 3 be formed on the end face of bearing cap 5 the outside, be timer 2 one sides.
But, on fuel-injection pump 1, at the end face of shell 4 sides of timer 2, promptly on the end face of shell 4 one sides of timer hub 21, in the periphery of camshaft 3,, the design oriented shell 4 side openings recess 21a, simultaneously above-mentioned rim 62 is placed in this recess 21a.That is, the front end of axial timer 2 one sides of rim 62 is arranged in the inside (right of Fig. 1) than the more close timer 2 of end face of shell 4 one sides of timer 2.And, be coaxial almost owing to be located at that recess 21a on the timer hub 21 is formed with camshaft 3, camshaft 3 is when rotating with timer hub 21, and rim 62 can not touch recess 21a.Like this, clearance G between timer hub 21 and the bearing cap 7 can keep with in the past fuel-injection pump in the identical size of situation, shorten the length of oil sealing 6 simultaneously, promptly encircle 61 axial length, thereby shorten the axial length of bearing cap 5, and then can shorten the total length of fuel-injection pump 1.
As described above, in the above-mentioned fuel-injection pump 1,, realized shortening the total length of fuel-injection pump 1 by the shape of variation oil sealing 6 and the shape of timer 2.That is, as shown in Figure 1, with the rim 62 of oil sealing 6 to the axial outside (right side of Fig. 1) of shell 4, be that timer 2 one sides are extended, on the end face of shell 4 one sides of timer hoop 21, designed coaxial and to the recess 21a of shell 4 one side openings simultaneously with camshaft 3.Like this, by rim 62 being placed in this recess 21a, kept the equal size of situation in clearance G and in the past the fuel-injection pump between timer hoop 21 and the bearing cap 7, shorten the length of oil sealing 6 simultaneously, promptly encircled 61 axial length, shorten the axial length of bearing cap 5, and then can shorten the total length of fuel-injection pump 1.
Embodiment 2
In this embodiment, changed the shape of oil sealing 6.Particularly the shape of rim 62 is made shape shown in Figure 2, and then, at the periphery mounting spring member 63 of rim 62.Spring members 63 can be for example to link the helical spring two ends and the ring that forms, and it is in order to keep the suitable surface pressure of sliding contacting part of rim 62 and camshaft 3.In the case, identical with embodiment 1, can shorten the total length of fuel-injection pump 1.
In addition, more than in Shuo Ming the fuel-injection pump of the present invention 1, timer 2 has the gear 22 that is meshed with the gear on the live axle that is fixed on internal-combustion engine, by these gear drive camshafts 3, but the method for drive cam shaft 3 is not limited to gear, and other method also can.For example, also fuel-injection pump 1 can be configured in and the live axle of camshaft 3 and internal-combustion engine roughly on the straight line, timer 2 and live axle are connected with shaft coupling (カ Star プ リ Application グ).
Claims (3)
1. fuel-injection pump has:
The camshaft (3) that drives by the live axle (11) of internal-combustion engine (10),
Be connected between described live axle (11) and the described camshaft (3), adjust the timer (2) of described camshaft (3) with respect to the rotation phase angle of described live axle (11),
Keep described camshaft (3) to make its rotating shell (4),
Outer circumferential side directly or by miscellaneous part is fixed on the end of described shell (4) and the oil sealing (6) of interior all sides and described camshaft (3) sliding contact; It is characterized in that,
Has on the end face of the described shell side of described timer (2) recess (21a) to described shell side opening;
Described oil sealing (6) to described timer side shaft in extending to described recess (21a).
2. fuel-injection pump as claimed in claim 1 is characterized in that:
Described oil sealing (6) by directly or be fixed on by miscellaneous part described shell (4) the end ring (61) and be fixed on that described ring (61) is gone up and constitute with the rim (62) of described camshaft (3) sliding contact;
The rim (62) of described oil sealing (6) extends in the described recess (21a).
3. fuel-injection pump as claimed in claim 2 is characterized in that:
Described oil sealing (6) has described rim (62) by the spring component on the outer circumferential face that is pressed in described camshaft (3) (63).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP230930/2002 | 2002-08-08 | ||
| JP2002230930A JP2004068739A (en) | 2002-08-08 | 2002-08-08 | Fuel injection pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1474048A CN1474048A (en) | 2004-02-11 |
| CN1292165C true CN1292165C (en) | 2006-12-27 |
Family
ID=31492350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03127578 Expired - Fee Related CN1292165C (en) | 2002-08-08 | 2003-08-08 | Fuel jet pump |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2004068739A (en) |
| CN (1) | CN1292165C (en) |
-
2002
- 2002-08-08 JP JP2002230930A patent/JP2004068739A/en active Pending
-
2003
- 2003-08-08 CN CN 03127578 patent/CN1292165C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004068739A (en) | 2004-03-04 |
| CN1474048A (en) | 2004-02-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |