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KR-102961835-B1 - Fuel injection valve for internal combustion engines

KR102961835B1KR 102961835 B1KR102961835 B1KR 102961835B1KR-102961835-B1

Abstract

The fuel injection valve (10) has a hydraulic control device (72) for controlling the axial movement of the injection valve member (56). The stem (76) of the intermediate valve member (78) of the mushroom-shaped configuration of the intermediate valve (83) is guided by the guide recess (74) of the intermediate part (66). In the open position, the intermediate valve member (78) opens the second connection (118, 117, 96) between the high-pressure fuel inlet (86) and the valve chamber (44), and in the closed position, the intermediate valve member (78) blocks the second connection (118, 117, 96) between the high-pressure fuel inlet (86) and the valve chamber (44). In the closed position of the intermediate valve member (78), the head (80) of the intermediate valve member (80) is positioned with a side facing the intermediate portion (66) with respect to the intermediate valve seat (82), through a first sealing surface (111.2) extending around the stem (76) or guide recess (74) at a first radial spacing (r1) to form a first annular sealing surface (121) that is continuous in the circumferential direction, and through a second sealing surface (112.2) extending around the stem (76) or guide recess (74) at a second radial spacing (r2) to form a second annular sealing surface (122) that is continuous in the circumferential direction, wherein the first radial spacing (r1) is greater than the second radial spacing (r2).

Inventors

  • 간제르, 마르코

Assignees

  • 간제르-히드로막 아게

Dates

Publication Date
20260507
Application Date
20210216
Priority Date
20200217

Claims (20)

  1. As a fuel injection valve (10) for intermittently injecting fuel into the combustion chamber of an internal combustion engine, Housing (12') having a longitudinal axis (L), a high-pressure fuel inlet (24'), and an injection valve seat (18'); A high-pressure chamber (26) disposed in the housing (12') and extending from the high-pressure fuel inlet (24') to the injection valve seat (18'); A spray valve member (56) disposed in the housing (12') and interacting with the spray valve seat (18') so as to be adjustable in the direction of the longitudinal axis (L); A compression spring (62') acting on the injection valve member (56) with a closing force directed toward the injection valve seat (18'); A guide portion (64) in which the control piston (68) of the injection valve member (56) is guided to a sliding fit; An intermediate part (66) that defines the control chamber (70) together with the guide part (64) and the control piston (68); A middle valve member (78) having a shaft (76) and a head (80) configured in a mushroom shape and guided in a guide recess (74) of the middle part (66), and a middle valve (83) comprising a middle valve seat (82) configured on the side of the middle part (66) toward the head (80) and interacting with the head (80), and a hydraulic control device (72) for controlling the axial movement of the injection valve member (56) by modifying the pressure of the control chamber (70), wherein the middle valve member (78) releases a first connection between the high-pressure fuel supply port (86) connected to the high-pressure chamber (26) in the open position and stops the first connection between the high-pressure fuel supply port (86) and the control chamber (70) in the closed position, and additionally separates the control chamber (70) from the valve chamber (44), excluding the throttle passage (90); It includes an electrically operable actuator assembly (38) for connecting the valve chamber (44) to a low-pressure fuel return (46) and separating the valve chamber (44) from the low-pressure fuel return (46). Here, the intermediate valve member (78) releases the second connection (118, 117, 96, 74, 126, 119, 108, 441, 441.1, 441.2) between the high-pressure fuel supply port (86) and the valve chamber (44) in the open position, and interrupts the second connection (118, 117, 96, 74, 126, 119, 108, 441, 441.1, 441.2) between the high-pressure fuel supply port (86) and the valve chamber (44) in the closed position, and The head (80) supports the intermediate valve seat (82) through a side facing the intermediate portion (66) at the closed position of the intermediate valve member (78), across a first sealing surface (111.2) extending from a first radial gap (r1) with respect to the shaft (76) or the guide recess (74) while forming a first annular sealing surface (121) that is essentially closed in a surrounding direction, and across a second sealing surface (112.2) extending from a second radial gap (r2) with respect to the shaft (76) or the guide recess (74) while forming a second annular sealing surface (122) that is essentially closed in a surrounding direction, wherein the first radial gap (r1) is greater than the second radial gap (r2). The high-pressure fuel supply port (86) of the intermediate part (66) is connected to an annular gap space (118) formed between the intermediate part (66) and the head (80) at the closed position of the intermediate valve member (78) and radially defined by the first and second annular sealing surfaces (121, 122), in such a way that the high-pressure fuel supply port (86) of the intermediate part (66) is opened at the closed position of the intermediate valve member (78). The second connecting portion (118, 117, 96) includes a supply port (96) of the intermediate valve member (78) which is opened to the valve chamber (44) through the first end and to the outer side of the intermediate valve member (78) through the second end, The second connecting portion (118, 117, 96) includes a supply port (96) of the intermediate valve member (78) which is opened to the valve chamber (44) through the first end and to the outer side of the intermediate valve member (78) through the second end, A fuel injection valve (10) in which the supply port (96) is opened toward the outer side of the intermediate valve member (78) through the second end in such a manner that the second end is spaced radially smaller from the shaft (76) than the second annular sealing surface (122) at the closed position of the intermediate valve member (78).
  2. In claim 1, The fuel injection valve (10), wherein the second connection (118, 117, 96, 108, 441, 441.1, 441.2) is a part of the valve chamber (44) and is connected between the bore (92) connected through the shaft (76) of the intermediate valve member (78) and the high-pressure fuel supply port (86).
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  4. In claim 1, A fuel injection valve (10) characterized in that a first annular sealing bead (111) having a first end surface (111.1) forming the first sealing surface (111.2) is formed on the side of the head (80) facing the middle portion (66) or on the side of the middle portion (66) facing the head (80).
  5. In claim 1, A fuel injection valve (10) characterized in that the second annular sealing bead (112) having a second end surface (112.1) forming the second sealing surface (112.2) is formed on the side of the head (80) facing the middle portion (66) or on the side of the middle portion (66) facing the head (80).
  6. In claim 1, The fuel injection valve (10) is characterized in that the intermediate portion (66) on the side facing the head (80) has at least one gradient (125), and the head (80) on the side facing the intermediate portion (66) has at least one gradient (127), wherein, in the closed position of the intermediate valve member (78), the mutually offset edges (125.1, 127.1) of the gradients (125, 127) of the intermediate portion (66) and the head (80) each radially define the first and/or second annular sealing surface (121, 122).
  7. In claim 6, A fuel injection valve (10) characterized in that the gradient (125) of the intermediate portion (66) forms an internal annular chamber (126) defined by the intermediate portion (66), the shaft (76), and the head (80) at the closed position of the intermediate valve member (78).
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  11. In claim 1, The fuel injection valve (10) is characterized in that the second connection (118, 117, 74, 126) comprises a passage formed by a gap existing radially between the shaft (76) and the guide recess (74), and the gap is at least 10 μm.
  12. In claim 1, The fuel injection valve (10) is characterized in that the shaft (76) has two annular protrusions (761, 762) spaced apart from each other along the longitudinal direction of the shaft (76).
  13. In claim 12, The above-mentioned annular protrusions (761, 762) each have at least one chamfer (762.1, 762.2, 762.3; chamfer) in the circumferential direction, wherein the second connection (118, 117, 126, 74) is formed by an intermediate space (119) between the at least one chamfer (762.1, 762.2, 762.3) and the guide recess (74), characterized in that the fuel injection valve (10).
  14. In claim 13, The fuel injection valve (10) is characterized in that each of the annular protrusions (761, 76) has two or three chamfers (762.1, 762.2, 762.3) in the circumferential direction.
  15. In claim 1, The above shaft (76) has at least one chamfer in the circumferential direction, wherein the second connection includes a passage formed by an intermediate space between at least one chamfer and the guide recess (74), characterized in that the fuel injection valve (10).
  16. In claim 1, The fuel injection valve (10) is characterized in that the second connection (118, 108, 441, 441.1, 441.2) includes a bore (441, 441.1, 441.2) that extends through the head (80) of the intermediate valve member (78), forms a valve chamber passage (441, 441.1, 441.2) that extends to the valve chamber (44), and is open on the side of the head (80) toward the intermediate part (66) through one end.
  17. In claim 1, The second connection (118, 108, 441, 441.1, 441.2) includes a bore (441, 441.1, 441.2) that extends through the head (80) of the intermediate valve member (78), forms a valve chamber passage (441, 441.1, 441.2) connected to the valve chamber (44), and is open on the side of the head (80) toward the intermediate part (66) through one end, A fuel injection valve (10) characterized in that the valve chamber passages (441, 441.1, 441.2) are connected from the intermediate valve member (78) in such a manner that the valve chamber passages (441, 441.1, 441.2) are opened in the closed position of the intermediate valve member (78) into an annular gap space (118) configured between the intermediate part (66) and the head (80) at the closed position of the intermediate valve member (78) and radially defined by the first and second annular sealing surfaces (121, 122).
  18. In claim 16, The fuel injection valve (10) is characterized by having an annular chamber (120) in which the high-pressure fluid supply port (86) is opened, and which is defined by the intermediate part (66), the shaft (76), and the head (80) at the closed position of the intermediate valve member (78).
  19. As a fuel injection valve (10) for intermittently injecting fuel into the combustion chamber of an internal combustion engine, A housing (12') having a longitudinal axis (L), a high-pressure fuel inlet (24'), and an injection valve seat (18'), A high-pressure chamber (26) disposed in the housing (12') and extending from the high-pressure fuel inlet (24') to the injection valve seat (18'), A spray valve member (56) disposed in the housing (12') and interacting with the spray valve seat (18') so as to be adjustable in the direction of the longitudinal axis (L), A compression spring (62') acting on the injection valve member (56) with a closing force directed toward the injection valve seat (18'); A guide portion (64) in which the control piston (68) of the injection valve member (56) is guided to a sliding pit; An intermediate part (66) that defines the control chamber (70) together with the guide part (64) and the control piston (68); A hydraulic control device (72) that controls the axial movement of the injection valve member (56) by modifying the pressure of the control chamber (70), wherein the intermediate valve member (78) has a shaft (76) and a head (80) configured in a mushroom shape and guided in a guide recess (74) of the intermediate part (66), and an intermediate valve (83) comprising an intermediate valve seat (82) configured on the side of the intermediate part (66) toward the head (80) and interacting with the head (80), wherein the intermediate valve member (78) disconnects the connection between the high-pressure fuel supply port (86) connected to the high-pressure chamber (26) and the control chamber (70) in the open position, and disconnects the connection between the high-pressure fuel supply port (86) and the control chamber (70) in the closed position, and additionally separates the control chamber (70) from the valve chamber (44), except for the throttle passage (90); It includes an electrically operable actuator assembly (38) for connecting the valve chamber (44) to a low-pressure fuel return (46) and separating the valve chamber (44) from the low-pressure fuel return (46). Here, the head (80) supports the intermediate valve seat (82) through a side facing the intermediate part (66) at the closed position of the intermediate valve member (78), across a first sealing surface (111.2) extending from a first radial gap (r1) with respect to the shaft (76) or the guide recess (74) while forming a first annular sealing surface (121) closed in a surrounding direction, and across a second sealing surface (112.2) extending from a second radial gap (r2) with respect to the shaft (76) or the guide recess (74) while forming a second annular sealing surface (122) closed in a surrounding direction, wherein the first radial gap (r1) is larger than the second radial gap (r2). A fuel injection valve (10) having a valve chamber passage (441) connected to the valve chamber (44) and having a valve chamber passage (441) extending from the intermediate valve member (78), such that the valve chamber passage (441) is opened in the closed position of the intermediate valve member (78) between the intermediate part (66) and the head (80) and radially defined by the first and second annular sealing surfaces (121, 122).
  20. In claim 19, A fuel injection valve (10) characterized in that the high-pressure fuel supply port (86) of the intermediate part (66) is connected to an annular gap space (118) radially defined by the first and second annular sealing surfaces (121, 122) at the closed position of the intermediate valve member (78), and the high-pressure fuel supply part (86) is opened in such a manner that the high-pressure fuel supply port (86) of the intermediate part (66) is connected to the annular gap space (118) formed between the intermediate part (66) and the head (80) at the closed position of the intermediate valve member (78).

Description

Fuel injection valve for internal combustion engines The present invention relates to a fuel injection valve for intermittently injecting fuel into the combustion chamber of an internal combustion engine. A fuel injection valve for intermittently injecting fuel into the combustion chamber of an internal combustion engine is described, for example, in document WO 2016/041739 A1. The fuel injection valve has a hydraulic control device for controlling the axial movement of the injection valve member by varying the pressure in the control chamber. The intermediate valve of the hydraulic control device has an intermediate valve member configured in a mushroom shape, and its shaft is guided by a tight sliding fit of a guiding recess that extends through the intermediate section. In the closed position of the intermediate valve member, the head of the intermediate valve member supports an annular intermediate valve seat configured in the intermediate section through a sealing surface that extends radially spaced from the shaft. An annular chamber having an internal annular chamber defined by the intermediate section, shaft, and head is permanently connected to a high-pressure fuel inlet configured in the housing of the fuel injection valve through a high-pressure fuel supply port that extends from the shaft and extends through the intermediate section. Except for a precision-sized throttle passage configured in the intermediate valve member and permanently connecting the control chamber to the valve chamber, the intermediate valve separates the control chamber from the valve chamber via a shaft guided by a tight sliding fit on the intermediate part. In the closed position of the intermediate valve member, the intermediate valve separates the high-pressure fuel supply port and the annular chamber from the control chamber, and when the intermediate valve member is moved out of the closed position, the connection between the high-pressure fuel supply port and the control chamber, along with the annular chamber, is released by the intermediate valve. The valve chamber can be connected to and disconnected from the low-pressure fuel return by an electrically activated actuator assembly. For the injection procedure to be operated, the valve chamber is connected to the low-pressure fuel return by the actuator assembly, and as a result, fuel from the control chamber flows into the valve chamber via the throttle passage of the intermediate valve member, and the injection valve member is lifted from the injection valve seat placed in the housing as a result of the associated pressure drop in the control chamber. An additional fuel injection valve is described in document EP 1 991 773 B1. The control chamber and the valve chamber are permanently connected to each other via a fine throttle passage, but these two chambers are further permanently separated from each other by an intermediate valve. The throttle passage is positioned to be directly adjacent to the control chamber. A passage having a larger cross-section than that of the throttle passage, leading to the control chamber and connected to the high-pressure chamber of the injection valve, is controlled by the intermediate valve. Since the cross-section of the outlet from the valve chamber, controlled by an electric actuator assembly, is also substantially larger than the cross-section of the throttle passage, the opening movement of the injection valve member is substantially a function of only the cross-section of the throttle passage. When the outlet from the valve chamber is closed by the actuator assembly, the intermediate valve rapidly opens and releases the large-diameter passage connected to the high-pressure chamber, which causes a rapid termination of the injection procedure. In embodiments of the present invention, further details will be provided by the description in relation to the following drawings. In the schematic drawings: Figure 1 shows an example of a conventional fuel injection valve in longitudinal cross-section. Figure 2 shows a part of a conventional fuel injection valve bounded by a rectangle labeled II in Figure 1, enlarged compared to Figure 1. FIG. 3 shows a portion of a first embodiment of a fuel injection valve according to the present invention in a longitudinal cross-section, wherein the portion represents an area of the fuel injection valve corresponding to the rectangle indicated by III in FIG. 2. FIG. 4 shows a portion of a second embodiment of a fuel injection valve according to the present invention in longitudinal cross-section, wherein the portion represents an area of the fuel injection valve corresponding to the rectangle indicated by III in FIG. 2. FIG. 5a shows a portion of a third embodiment of a fuel injection valve according to the present invention in a longitudinal cross-section, wherein the portion represents an area of the fuel injection valve corresponding to the rectangle indicated by III in FIG. 2. FIG. 5b shows a pa