Component pairing and device having component pairing
A technology of structural elements and media, applied in the directions of fuel injection devices with piezoelectric elements or magnetostrictive elements, pump elements, components of pumping devices for elastic fluids, etc., which can solve technical contradictions, leak, and minimize leakage chemical or sealing issues
Inactive Publication Date: 2013-08-14
ROBERT BOSCH GMBH
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Problems solved by technology
The problem here is that the two functions (motion guidance and leakage minimization or sealing) lead to technical contradictions
Therefore, in high-pressure systems, the gap between two structural elements often leads to undesired oil dilution due to the required gap width (due to the penetration of fuel into the oil), provided that these structural elements have sufficient mobility relative to each other. middle) or cause oil to get into the fuel, or as in the case of fuel injectors cause excessive leakage of fuel from the high pressure region of the injector into the low pressure region of the injector
[0004] Especially in modern diesel engines, the ingress of oil into the diesel must be absolutely avoided in order to avoid the formation of putty, which, for example, drastically shortens the service life of the particle filter
Method used
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[0021] exist figure 1 A subassembly 1 of structural elements is shown in , as it can be used, for example, in fuel injectors or pumps. The structural element set 1 comprises a first structural element 2 which is stationary, ie immovable, and a second structural element 3 which is axially displaceable relative to the first structural element 2 in the direction of the arrow 4 . In the illustrated embodiment, the second structural element 3 is a structural element 3 with a substantially cylindrical profile, which is received in a likewise cylindrical receiving hole 5 of the first structural element 2 .
[0022] Radially between the structural elements 2 , 3 there is a gap 6 designed as a circumferential gap surrounding the second structural element 3 over its entire circumference, which likewise acts as a guide gap for the second structural element 3 relative to the first structural element 3 . Guidance of a structural element 2 . The gap width, ie the radial extent of the gap ...
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The invention relates to a component pairing (1), comprising a first component (2) and at least one second component (3) adjustable relative to the first component (2), wherein a gap (6) is formed between the components (2, 3), said gap being connected to a first chamber (7) containing a first medium (8) and a second chamber (9) containing a second medium (10). According to the invention, at least one oscillating exciter (11) is provided in the gap (6) for producing a pressure increase of the first and / or of the second media (8, 10). The invention further relates to a device having a component pairing (1).
Description
technical field [0001] The invention relates to a pair of structural elements according to the preamble of claim 1 . Background technique [0002] Such a pair of structural elements is provided, for example, in a fuel injector described in DE 102 07 227 A1. In this case, the first structural element is formed by the nozzle body of the injector, and the second structural element, which is movable relative to the first structural element, is formed by a nozzle needle which is guided so as to be axially displaceable in the nozzle body. A circumferential gap extending in the axial direction is realized between the nozzle body and the nozzle needle, which connects a nozzle chamber with fuel under rail pressure (first medium) and a nozzle chamber with fuel under low pressure ( The low-pressure chambers of the second medium) are separated from each other. Due to the high pressure difference relative to the low-pressure chamber, the fuel located in the nozzle chamber tries to flow...
Claims
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IPC IPC(8): F02M59/44F02M55/00F02M61/16F04B17/00F04B53/16
CPCF02M61/16F04F7/00F04B53/164F04B53/02F02M59/442F02M2200/21F02M55/004
Inventor S·鲁特哈特J·京特尔特J·拉普
Owner ROBERT BOSCH GMBH