Claims (21)
An apparatus for returning fuel from a storage tank to an internal combustion engine of an automobile, the apparatus comprising a return pump (3), particularly a gear pump, connected in the return conduit from a storage tank to an internal combustion engine, the return pump (3) The displacement member has at least one pump chamber (23) in the pressure chamber (1). The displacement member is connected to the pressure chamber (5) and the suction side (65) of the pump (5) are connected to a negative pressure (31), the pump (3) Is connected to a braking force enhancer of an automobile so as to generate an internal combustion engine.
2. The apparatus according to claim 1, wherein the return pump (3) and the pump (5) for conveying air are arranged in one common casing (1) . ≪ / RTI >
The pump according to claim 2, wherein the pump for conveying the air, which is disposed in the common casing (1) of the return pump (3) is constituted as a vane pump (5) And the rotor 51 is provided with a guide slit 59 for receiving a plurality of vanes 61. The axially outward end of the vane 61 is eccentric with respect to the rotor shaft And slid airtightly along the wall of the pump chamber (7) of the arranged vane pump (5).
The vane pump according to claim 3, characterized in that the transfer pump and the vane pump (5) constituted as the gear return pump (3) are arranged in the longitudinal direction of each other in the axial direction, and the driven gear (25) And the rotor (51) of the rotor (5) is rotationally driven by a common drive shaft (15).
5. The apparatus according to claim 4, wherein the common drive shaft (15) is coupled to the axial end of the camshaft of the internal combustion engine via an elastic connecting member.
6. A device according to claim 5, characterized in that the resilient connecting member comprises at least one fitting key (19) made of an elastic material and the fitting key (19) is arranged on the end face of the camshaft Fitted into the groove provided on the end face of the driven circular plate (17).
The clutch disc (55) according to claim 6, wherein the clutch disc (55) is forcedly fitted to the drive shaft (15) on the side opposite to the connecting members (17, 19) (51) and is constrained by the shape.
The pump according to claim 4, wherein a cylindrical casing web (11) is provided in the pump casing (1), and the rotor (51) of the vane pump (5) And the casing web 11 is provided with a through hole 13 coaxial with the rotor 51 and the drive shaft 15 is guided in the through hole 13 so as to be slidably movable Device.
The apparatus according to claim 3, characterized in that the vane (61) movable in the radial direction of the vane pump (5) is arranged inclined from the radial plane of the rotor in the rotational direction of the rotor (51).
The braking system according to claim 3, wherein a connection hole (67) for accommodating a connecting tube piece (69) for connecting the hose to the braking force enhancer is open to the pump chamber (7) of the vane pump (5) And a check valve (71) opened toward the pump chamber (7) on the upstream side is connected.
The internal combustion engine as set forth in claim 3, characterized in that a lubricating hole (75), which is inclined in the pump casing (1) and connected to the lubricant circuit of the internal combustion engine, opens on the end face of the rotor (51) The ring groove 79 is disposed in the end face of the rotor 51 in the area of the rotor 51 and the pressing and deforming portion in the radial inner wall surface 79 and the coaxial through hole The lubricant outlet opening 73 connected to the lubricant circuit of the internal combustion engine is extended from the end face 9 of the pump casing 1 on the side opposite to the camshaft .
A device as claimed in claim 4, characterized in that the driven gear (25) of the gear transfer pump (3) is coupled to the drive shaft (15) by constraint by shape.
The pump casing (1) according to claim 4, wherein the return passage (39) connected to the return conduit of the internal combustion engine and the pressure passage (35) extending from the pressure chamber (31) of the pump chamber (23) (21) on one side of the casing end surface (21).
The pump casing (1) according to claim 7 or 13, characterized in that the pump casing (1) is closed by one casing cover at the end faces (21, 9) arranged perpendicular to the axis of the drive shaft The first casing cover 43 that closes the pump casing 1 on the side facing the camshaft closes the pump chamber 23 of the gear return pump 3 and the return and pressure passage, Wherein the second casing cover (56) closes the pump chamber (7) of the vane pump (5).
The apparatus according to claim 7 or 14, wherein the clutch disc (55) abuts against the second casing cover (56).
The fuel cell system according to claim 13 or 14, wherein a return hole (47) from the internal combustion engine opening in the return passage (39) and a pressure hole (45) opening in the pressure passage (35) And each of the connection holes in the cylinder head of the internal combustion engine is in intimate contact with the first casing cover (43) at the end surface of the first casing cover (43) opposite to the pump casing (1).
The pump casing (1) according to claim 16, wherein a connection passage (41) between a return conduit (39) and a pressure passage (35) connected to a return conduit (85) to a storage tank is disposed in the pump casing And a pressure limiting valve (83) for controlling the connection between the passage (35) and the return passage (39) always connected to the return conduit (85).
A pump according to claim 14, characterized in that the pump chamber (23) of the gear return pump (3) is sealed to the vane pump (5) and the internal combustion engine by two shaft seal rings (49) Characterized in that.
The apparatus according to claim 1, characterized in that the gear return pump (3) conveys the fuel to the high pressure injection pump of the internal combustion engine.
5. The device according to claim 4, characterized in that a throttling point is provided in the fuel supply conduit (33) which opens in the pump chamber (23) of the return pump (3).
19. The apparatus according to claim 18, characterized in that a shaft seal ring (49) for separating the medium, fuel and lubricant is connected to the pump chamber (23) of the return pump (3) by a groove so as to generate a pressure difference toward the pump chamber .