• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SU1489583A3
    申请号:SU853886806
    申请日:1985-05-07
    公开日:1989-06-23
    发明作者:Peter Vannenvech
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    The invention relates to fuel-injecting equipment for internal combustion engines and allows to exclude fuel injections on low fuel supply modes. The sealing surface 22 of the locking element 6 is mated by means of a pressure spring 23 with a sealing surface 5 of the seat body 3. The suction belt (OP) 25 is located on the
    SP
    № <„, 1489583 AZ
    13
    !
    1489583
    2
    one
    the control element with the possibility of immersion in the passage channel (K) 4 in the closed position of the discharge valve and dividing K 4 into two cavities 26 and 27. The element from the cavity 2 side of fitting 1 is made with an end axial axle 31 and is equipped with a cup 32 with an external flange 33 , pressed on the pin. Spring 23, 0
    mates with flange. Unloading K 7 is made in the body of the element to connect the cavity 2 with K 4 to the OP through the throttle 29 and check valve (OK) 8, the throttle is made in the bottom of the glass 15
    32, and OK is located inside the latter. The choke is made in the form of a hole with an expanding section in the form of a diffuser on the inner side of the glass, forming the valve seat of the valve; 20 to 31 valves, and its closing spring 36 rests on the trunnion. The locking member is provided with a valve plate guide 37 located between the latter and the spring 36. The OK is installed so as to overlap the throttle on the pump side and is made with a ball locking organ. The Throttle K 28 connects the cavities 26, 27 and is formed by the segment cut 28 on the outer diameter of the OD 25. .
    With increased portions of the injected fuel and also with a higher consumption of OP goes out of K 4, and the supplied fuel passes into the cavity 2, bypassing the K 28 and OP. In this case, at the end of the fuel supply, the full stroke of the element for the return suction of the fuel acts and the OP basically unloads the injection fuel line 12 to prevent re-injection. injection. At low fuel consumption, possible sub-injections are eliminated with OK, 4 C.p. f-ly, '
    1 il.
    The invention relates to mechanical engineering, and more specifically to fuel-injection equipment for internal combustion engines, and can be used in the design of the injection valve of high-pressure fuel pumps.
    The aim of the invention is the exclusion of sub-injections of fuel on low fuel supply modes.
    The drawing shows the discharge valve, a longitudinal section.
    The discharge valve consists of a fitting 1 with a cylindrical cavity 2, a seat body 3 with a passage 4 and a sealing surface 5, a locking element 6 with a discharge channel 7 made in the body of the locking element 6, and a check valve 8. The fitting 1 has a threaded end 9, with which it is attached to the pump casing 10, and a nipple 11 for fixing the injection fuel line 12. The cylindrical cavity 2 on the pump side is connected to its working cavity (not shown) ^ using the internal channel 13 and; coaxially on the opposite side with soup external channel 14 and the fuel injection nozzle 12, 15. In the cylindrical cavity 2 by the pump body placed
    seat 3, having from the pump side a flange 16, with the help of which it is pressed with the torus 17 of the fitting 1 against the annular protrusion 18 on the bottom of the threaded hole 19 of the pump housing 10. At the other end located inside the cavity 2, the housing 35 sealing surface 5. The locking element 6 has an end 20, a guide part 21, made in the form of four feathers for the passage of fuel to the seat 3 and is located in the passage channel 4, and also has a conical sealing surface 22 for mating by means of a pressure spring 23 with of the saddle sealing surface 22 and the guide part 21, the body of the locking element is made in the form of a cylinder 24, which is much smaller in diameter than the diameter of the passageway channel 4. In the zone of the cylinder 24, the locking element 6 has a suction band 25, which is immersed in the entrance kenal with an established clearance and divides the passage 4 into two
    55 cavities 26 and 27, respectively, from the sealing surface 22 to the suction belt 25 and from there to the inner channel 13. On the outer surface of the suction belt 25
    ό '1489583 4
    a segment slice 28 is made, which cuts the throttle channel 28, makes a throttle channel connected in the suction belt 25 without
    The unloading channel 7 is equipped with a throttle 29 and connects the cavity 2 of the fitting 1 with the cavity 27 of the passing channel 4 from the suction band 25 to the internal channel 13 and has an outlet 30 on the surface of the cylinder 24, and the inlet on the end of the trunnion 31 of the locking element 6. The pin 31 is adjacent to the sealing surface 22 of the shut-off valve 6 and bounds it from the inside of the cavity 2, it also serves to center the cup 32 with the flange 33, which tightly adjoins the end of the locking element 6 with its inner surface Tew, and the outer surface serves as a support 20 '
    for the pressure spring 23. The other end of the pressure spring 23 abuts against the end 34 of the cylindrical cavity 2. The pressure spring 23 tightly presses the cup 32 against the body of the locking element 25 6 and thereby presses the latter against the sealing surface 5 of the saddle 3. The cup 32 with the flange 33 can also to connect with the body of the locking element and in other ways, for example, 30 by means of pressing or welding.
    In the inner cavity 35 of the cup 32, there is a check valve 8 with a locking spring 36, which abut one end 35 against the front part 35 of the trunnion 31 and the other end against the valve plate guide 37. The valve plate 37 serves to guide the locking member 38 of the check valve in the form of a ball, the locking member 38 is located in a conical recess 39 expanding towards the inner cavity 35 of the cup 32, which serves as a seat for the check valve and passes into the drog-45 sel 29, which communicates the cylindrical cavity 2 with the inner polo 35 cups when the check valve is in the open position.
    The discharge valve operates as follows.
    When fuel is supplied to the nozzle during pump operation, the pressure of the internal channel 13 causes the body of the locking element to rise as shown in the drawing. If served,
    a small amount of fuel per unit of time, it can pass through the absence of the last passage 4. The locking element 6 is only slightly raised, and yet pressure builds up in the fuel supply line 12, which exceeds the opening pressure of the nozzle and provides fuel injection at the B end of the stroke pump supply, the fuel cut-off occurs, the pressure from the pump drops and the locking element 6 under the action of the pressure spring 23 is lowered onto the seat 3, i.e., closes the flow channel 4. At the same time, by means of a suction belt, 25 tons Pliva is sucked back out of the region above the seat 3 until the valve comes to the closed position. At the same time, the amount of fuel that is sucked back decreases to a part that flows as a balancing flow along the throttle channel 28. Thus, discharge of the fuel injection pump 12 between the closure element body and the nozzle occurs.
    After landing of the locking element 6 on the saddle 3 and closing the nozzle .15 in the injection fuel line 12 due to the dynamics of these processes, pressure waves arise that run through it, which are reflected from the body of the locking element 6 and run in both directions between it and the nozzle. These pressure waves can reach a pressure value greater than the opening pressure of the nozzle 15, which, without additional measures, leads to fuel injection. Peak pressure wave pressure in the fuel line 12 is higher, the higher the total residual pressure in it after landing of the locking element 6 on the saddle 3. When the peak pressure greater than the opening value of the check valve, approach it, the locking member 38 of the latter moves away from its saddle and then the connection of the cavity 2 and the fuel line 12 with the internal channel 13 of the pump is restored. At the same time through the throttle 28 a certain amount of fuel flows, which reduces the wave of the incoming pressure wave. The wave reflected after this to the nozzle has a pressure value not exceeding the nozzle opening pressure. .
    five
    1489583
    6
    At increased portions of the injected fuel and also at a higher flow rate corresponding to higher revolutions, the influence of the throttle channel 28 is enhanced so that the suction belt 25 leaves the passage channel 4 and the supplied fuel in addition to the throttle channel 28 and the suction belt 25. Passing from pump into the cylindrical cavity 2. In this case, at the end of the fuel supply, the full stroke of the body of the locking element 6 for the 'suction of the fuel and the suction belt 25 mainly performs unloading fuel line 12 to prevent re-injection. The discharge portion then constitutes the main discharge volume 20, equal to the product of the stroke of the body of the locking element 6 and the area of the ring of the suction belt 25.
    The droseln channel 28 during the rapid movement of the body of the locking element 6 flows a slight equalizing amount of fuel, so that the injection fuel line 12 is maximally unloaded. Since the discharge volume of the ES is significant, the residual pressure in the injection fuel line 12 has only small peaks, which are usually lower than the opening pressure of the nozzle 15. More high pressure peaks are in this case selected in a similar way using a check valve . The throttle passage 28 in the collar of the suction 25 may be configured as 4 (a larger gap between the suction belt 25 and a through g Ka. Nalom 4 or in the form of holes in the collar of the suction.
    four!
    Performing a discharge valve with a check valve and a suction flange with a throttle channel ensures that at low fuel consumption, especially in the range of operation at low speeds, the injection fuel line is discharged to a small extent; 5 , By changing the throttle bore area, the size of the suction band or discharge volume, and the opening pressure of the check valve, it is possible to maintain the necessary residual pressure in the fuel injection line, which does not exceed the opening pressure of the nozzle after they are closed. The opening pressure of the check valve is preferably chosen such that it is approximately equal to the nozzle closing pressure. This allows you to maintain a very high constant pressure or residual pressure in the injection fuel line with the least amount of discharge. All this ensures optimum fuel injection time in the quiet (idle) mode and eliminates the fuel injections on them.
    权利要求:
    Claims (5)
    [1]
    Claim
    1. An injection valve for a high-pressure fuel pump of an internal combustion engine, comprising a seat housing with a flow passage and a sealing surface ^ a pressure spring and a locking element having a guide part accommodated
    in the flow channel, the sealing surface for mating by means of a pressure spring with the sealing surface of the housing, a suction band located on the guide part of the locking element with the possibility of NSTI immersion into the passage through the closed position of the valve and separation of the passage into two cavities, and a discharge channel made in the body of the locking element to connect the cavity of the fitting with the passage.to the suction belt through the choke and non-return valve installed with the possibility of overlapping the throttle with the pump side and made with a ball locking member, spring-loaded with respect to the shut-off element of the discharge valve by a pressure spring, which is characterized by the fact that, in order to exclude Skov fuel at low feed mode, a suction belt is provided with a throttle duct connecting the two cavities adjacent to them.
    [2]
    2. Valve on π. 1, characterized in that the throttle channel is formed by a segment cut on
    7
    1489583
    eight
    outer diameter of the suction belt.
    [3]
    3. Valve on PP. 1 and 2, characterized in that the closure element on the side of the nozzle cavity is made with an end axial axle and provided with a cup with an external flange pressed onto the axle, the pressure spring is associated with its outer flange, the throttle of the discharge channel is made in the bottom of the cup, and check valve is located inside the latter.
    [4]
    4, Valve according to claim 3, distinguishing with I in that the throttle is unloaded-
    The sacral canal is made in the form of an opening with an expanding section in the form of a diffuser with the inner side of the glass that forms the seat of the valve block of the non-return valve, and its closing spring rests on the trunnion.
    [5]
    5, Valve under item 3, characterized in that the check valve of the check valve is provided with a guide valve plate placed between the latter and the locking spring.
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    同族专利:
    公开号 | 公开日
    US4648369A|1987-03-10|
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    JPS60247049A|1985-12-06|
    EP0163078A1|1985-12-04|
    DE3563553D1|1988-08-04|
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    KR850008704A|1985-12-21|
    引用文献:
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    US3933132A|1971-10-20|1976-01-20|Isuzu Motors Limited|Another liquid-mixing injection system for internal-combustion engine|
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    JPS5675957A|1979-11-21|1981-06-23|Diesel Kiki Co Ltd|Draft device of delivery valve for fuel injection pump|
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    DE3138211A1|1981-09-25|1983-04-07|Robert Bosch Gmbh, 7000 Stuttgart|FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES|JPS61138875A|1984-12-12|1986-06-26|Nissan Motor Co Ltd|Fuel delivery valve of fuel injection device|
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    GB8725029D0|1986-11-27|1987-12-02|Daimler Benz Ag|Inclined-edge controlled fuel injection pump|
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    EP0454799B1|1989-11-13|1993-09-22|Robert Bosch Gmbh|Pressure valve|
    JPH04121456A|1990-09-12|1992-04-22|Nissan Motor Co Ltd|Direct injection type diesel engine|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19843417210|DE3417210A1|1984-05-10|1984-05-10|PRESSURE VALVE|
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