EP0309797B1
Expired / Lapsed
EP
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Magnetic valve
Assignee: Robert Bosch GmbH
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Filing: 1988-09-09
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Granted: 1992-05-06
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Expires: 2008-09-09
Abstract
No abstract record available.
Inventors
- 👤 Ernst Dipl.-Ing. Linder
- 👤 Helmut Dipl.-Ing. Rembold
- 👤 Manfred Dipl.-Ing. Ruoff
- 👤 Walter Schlagmüller
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 20:03
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/44; F02M59/46; F02M59/466
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
446 words
Electromagnetic valve for controlling the passage of a connecting line (18) between a high-pressure space, in particular a pump working space of a fuel injection pump, brought at least temporarily to high fluid pressure, and a low-pressure space, with a valve casing (1) and a guide bore (4, 73) which is arranged in the latter and opens into an annular space (17), the lateral boundary wall of which, which faces in the axial direction and faces away from the guide bore (4, 73), merges as valve seat (7), tapering conically with a first cone angle α1, into a connection bore (5) coaxial to the guide bore (4, 73) and having a reduced diameter compared to the guide bore, with a piston slide (12, 67) of stepped diameter serving as a valve closing member, which can be displaced by an electromagnet (29) counter to the force of a return spring (32) and which has a guiding part (11) guided in the guide bore and a cylindrical part (16) which dips into the connection bore and is separated from the guiding part (11) by an annular recess (14), and the lateral boundary wall of the recess is designed with a conical slope towards the guiding part (11), with a second cone angle α2 which is larger than the first cone angle α1, and the boundary line between the guiding part (11) and the lateral boundary wall of the recess (14) serves as a sealing edge (15), by which, in its closed position, the piston slide comes to rest against the valve seat (7), the end face of the cylindrical part (16) delimiting in the valve casing (1) a space (31) which is connected via a connecting channel (30, 26) to a space (28, 72) delimited at the end face by the guiding part (11) and is connected via a restrictor (9, 9', 78, 93) to a relief space, furthermore with an inlet opening of the connecting line (18), the said line coming from the high-pressure space, in the wall of the annular space (17) and with an outlet opening in the wall of the connection bore (5, 55) within the region of overlap of the latter with the annular recess (14, 66 and with an axial stop (33), against which the piston slide can be moved in the open position, with the sealing edge (15) raised from the valve seat (7, 57), characterised in that the spaces (31, 28, 61, 72, 31, 28") in the valve casing (1) which are delimited by the end faces of the piston slide are relieved of pressure and the piston slide is stressed towards the open position by the return spring (32).
Claim 2
Dependent Claim
51 words
Electromagnetic valve according to Claim 1, characterised in that the piston slide has a through channel (30, 26) which connects the end faces of the piston slide to one another, and the restrictor (9) is arranged as a restriction bore in the end closure of the connection bore (5) (Figure 1).
Claim 3
Dependent Claim
41 words
Electromagnetic valve according to Claim 1, characterised in that the spaces (61, 79) are connected to the annular recess (66) via an annular gap (78), forming the restrictor, between the second cylindrical part (68) and the connection bore (55) (Figure 3).
Claim 4
Dependent Claim
52 words
Electromagnetic valve according to Claim 1, characterised in that the piston slide has a through channel (30, 26') which connects the end faces of the piston slide to one another, and the restrictor (9') is arranged in a connecting bore between the through channel (30) and the annular recess (14) (Figure 2).
Claim 5
Dependent Claim
44 words
Electromagnetic valve according to Claim 2, characterised in that the return spring (32) is clamped inside an axial recess (30) of the second cylindrical part (16), between the latter and an end closure (8) of the connection bore (5) (Figs. 1, 2, 4, 5).
Claim 6
Dependent Claim
70 words
Electromagnetic valve according to one of Claims 1 to 4, characterised in that the return spring (75) is supported against a spring plate (74) which (lacuna) at the end of a part (71) of the guide-bore part (67) of the piston slide, which part projects from the guide bore (73), and in that the armature (77) of the electromagnet engages on the opposite part of the piston slide (Figure 3).
Claim 7
Dependent Claim
137 words
Electromagnetic valve according to Claim 1 to 4, characterised in that that end of the guide bore (4') which faces away from the annular space (17) has an annular, flat recess (86) in which a toroidal sealing ring (87) can be moved backwards and forwards axially with slight deformation, which, on the other side, rests by its inside diameter against a cylindrical piston-slide part (21") projecting from the guide bore, which part is reduced in diameter relative to the guiding part (11) of the piston slide and which, between the contact of the toroidal sealing ring (87) and the guiding part (11) has a connecting channel (27) which leads off to the space (31) delimited by that end face of the piston slide which is on the same side as the connection bore (Figs. 4 + 5).
Claim 8
Dependent Claim
64 words
Electromagnetic valve according to Claim 7, characterised in that the piston slide has an axial through slot (30, 26"), the projecting cylindrical part (21") being connected to the armature (22) of the electromagnet (13) and being closed at the end face and the space (28") accommodating the armature (22) and the electromagnet being relieved towards the ambient air via a restrictor (93) (Fig. 4).
Claim 9
Dependent Claim
216 words
Electromagnetic valve according to Claim 1 to 4, characterised in that that end of the guide bore (4') which faces away from the annular space (17) has an annular, flat recess (6) in which a toroidal sealing ring (87) can be moved backwards and forwards axially with slight deformation, the said ring, on the other side, resting by its inside diameter against a cylindrical part (21"), projecting from the guide bore, of the piston slide, which part is reduced in diameter relative to the guiding part (11) of the piston slide and, between the contact of the toroidal sealing ring (87) and the guiding part (11), has a connecting channel which leads off to a relief space, and in that that end of the connection bore (5") which faces away from the annular space (17) has an annular, flat recess (96) in which a second toroidal sealing ring (97) can be moved backwards and forwards axially with slight deformation, the said ring, on the other side, resting by its inside diameter against the end of the second cylindrical part (16) displaceable in the connection bore (5"), and the space (98) which is on the annular-space side and is enclosed by the toroidal sealing ring leads off via a connecting channel to the relief space (Fig. 5).
Claim 10
Dependent Claim
54 words
Electromagnetic valve according to Claim 9, characterised in that the piston slide has an axial through slot (30, 26"), the armature (22) of the electromagnet being secured on the cylindrical part (21") and the space (28") accommodating the armature and the electromagnet being relieved towards the ambient air via a restrictor (93) (Fig. 5).
Claim 11
Dependent Claim
102 words
Electromagnetic valve according to one of the preceding claims, characterised in that, in addition to the return spring (32), a second spring (100) is provided which is clamped between a fixed part (76) of the casing of the electromagnetic valve and a spring plate (101) which is supported against an adjustable stop (103) on the casing of the electromagnetic valve and, from a partial stroke onwards of the piston slide in the closing direction, comes to rest against a stop (104) on the piston slide and, over the remaining closing stroke of the piston slide, can be raised from the fixed part.
References Cited (Backward Citations)
DE3302294A1
Cited
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