US5050558A — Fuel injection pump for internal-combustion engin…

Claim 1

Independent Claim 499 words

A fuel injection pump for internal combustion engines with injection points, comprising: means for forming a pump working space (53); at least two pump pistons (37) reciprocably moving in said pump working space (53) so as to have an injection-effective pump piston pressure stroke and a suction stroke; a distributor (35) having a periphery and a distributor orifice (61) arranged on said periphery in constant connection with said pump working space (53), said distributor being formed to drive synchronously with said pump pistons (37); a plurality of pressure channels (62) connectable via injection lines (63) to injection points (64) of the internal combustion engine, said working space (53) being connected to a respective one of said pressure channels (62) during said pressure stroke; means for providing fuel and including a fuel storage (58) and a filling line (54, 55) communicating with said fuel storage (58), said distributor (35) being connected to said fuel storage via said filling line (54, 55) during said suction stroke; means for relieving pressure from said working space (53) and including a relief channel (66); means for communicating said distributor (35) with said relief channel (66) during said pressure stroke and including an electrically controlled valve (67) therebetween; means for controlling said injection-effective pump piston pressure stroke and including cam drive means formed to reciprocably move said pistons (37), said cam drive means including at least an essentially stationary part (13, 33, 93) and a rotary-driven part (9, 13", 33'), one of said parts having a cam contact surface (11) with cams lying in a radial plane relative to an axis of said rotary part and the other part having a piston carrier (33, 33') and a roller carrier (13, 13") with radial guide bores (29); means for guiding said pump pistons (37) and including radial guide bores (36) formed in said piston carrier (33, 33') through which said pump pistons (37) interact with said cam surface (11), said cam drive means having rollers (31) guided in said radial guide bores (29) of said roller carrier and interposed between said parts, said pistons (37) being formed to move in response to said rollers (31) running on said cam contact surface (11) in response to a relative movement of said parts; a coupling (46, 47, 49); means for guiding said distributor (35) coaxially relative to said rotary driven part and including a distributor cylinder (42), said distributor (35) being formed as a shaft and being coupled via said coupling (46, 47, 49) to said rotary-driven part (8); and means for compensating for misalignments and including a coupling part (39, 97) coupling said piston carrier (33, 33') to said roller-carrier (13, 13"), said coupling part (39, 97) being connected rigidly to one of said carriers (13, 13" or 33, 33') and having a spherical shape in contact to the other of said carriers (13, 13" or 33, 33') so that misalignments are compensated in radial and axial directions due to said spherical shape being in said contact.

Claim 2

Dependent Claim 499 words

A fuel injection pump for internal combustion engines with injection points, comprising: means for forming a pump working space (53); at least two pump pistons (37) reciprocably moving in said pump working space (53) so as to have an injection-effective pump piston pressure stroke and a suction stroke; a distributor (35) having a periphery and a distributor orifice (61) arranged on said periphery in constant connection with said pump working space (53), said distributor being formed to drive synchronously with said pump pistons (37); a plurality of pressure channels (62) connectable via injection lines (63) to injection points (64) of the internal combustion engine, said working space (53) being connected to a respective one of said pressure channels (62) during said pressure stroke; means for providing fuel and including a fuel storage (58) and a filling line (54, 55) communicating with said fuel storage (58), said distributor (35) being connected to said fuel storage via said filling line (54, 55) during said suction stroke; means for relieving pressure from said working space (53) and including a relief channel (66); means for communicating said distributor (35) with said relief channel (66) during said pressure stroke and including an electrically controlled valve (67) therebetween; means for controlling said injection-effective pump piston pressure stroke and including cam drive means formed to reciprocably move said pistons (37), said cam drive means including at least an essentially stationary part (13, 33, 93) and a rotary-driven part (9, 13", 33'), one of said parts having a cam contact surface (11) with cams lying in a radial plane relative to an axis of said rotary part and the other part having a piston carrier (33, 33') and a roller carrier (13, 13") with radial guide bores (29); means for guiding said pump pistons (37) and including radial guide bores (36) formed in said piston carrier (33, 33') through which said pump pistons (37) interact with said cam surface (11), said cam drive means having rollers (31) guided in said radial guide bores (29) of said roller carrier and interposed between said parts, said pistons (37) being formed to move in response to said rollers (31) running on said cam contact surface (11) in response to a relative movement of said parts; a coupling (46, 47, 49); means for guiding said distributor (35) coaxially relative to said rotary driven part and including a distributor cylinder (42), said distributor (35) being formed as a shaft and being coupled via said coupling (46, 47, 49) to said rotary-driven part (8); and means for compensating for misalignments and including a coupling part (39, 97) coupling said piston carrier (33, 33') to said roller-carrier (13, 13"), said coupling part (39, 97) being connected rigidly to one of said carriers (13, 13" or 33, 33') and having a spherical shape in contact to the other of said carriers (13, 13" or 33, 33') so that misalignments are compensated in radial and axial directions due to said spherical shape being in said contact.

Claim 3

Dependent Claim 293 words

A fuel injection pump for internal combustion engines, comprising: means for forming a pump working space (53); at least two pistons (37) reciprocably moving in said pump working space (53) and having an injection-effective pump piston pressure stroke and a suction stroke; cam drive means for reciprocably moving the pistons (37) and including two parts, the two parts including an essentially stationary part (13, 33, 93) and a rotary-driven part (8, 9, 13", 33') with an axis, said rotary-driven part being formed to rotate about said axis and to move relative to said essentially stationary part, one of the two parts having a cam contact surface (11) with cams directly radially with respect to the axis of the rotary-driven part, the other of the two parts having two carriers including a piston carrier (33, 33') with radial bores (36) and a roller-carrier (13, 13") with radial bores (29), the pistons (37) being guided in the radial bores (36) of the piston carrier (33, 33'); means for interacting the pistons (37) with the cam contact surface (11) and including rollers (31) interposed between the two parts of the cam drive means and being formed to run on the cam contact surface (11) in response to a relative movement of the two parts of the cam drive means, the pistons (37) being formed to move in response to the rollers (31) running on the cam contact surface (11); and means for compensating for misalignments in radial and axial directions and including a coupling (39, 97) having a spherical shape in contact with one of the two carriers (13, 13"; 33, 33') of the cam drive means, the coupling (39, 97) being rigidly connected to the other of the two carriers of the cam drive means.

Claim 4

Dependent Claim 293 words

A fuel injection pump for internal combustion engines, comprising: means for forming a pump working space (53); at least two pistons (37) reciprocably moving in said pump working space (53) and having an injection-effective pump piston pressure stroke and a suction stroke; cam drive means for reciprocably moving the pistons (37) and including two parts, the two parts including an essentially stationary part (13, 33, 93) and a rotary-driven part (8, 9, 13", 33') with an axis, said rotary-driven part being formed to rotate about said axis and to move relative to said essentially stationary part, one of the two parts having a cam contact surface (11) with cams directly radially with respect to the axis of the rotary-driven part, the other of the two parts having two carriers including a piston carrier (33, 33') with radial bores (36) and a roller-carrier (13, 13") with radial bores (29), the pistons (37) being guided in the radial bores (36) of the piston carrier (33, 33'); means for interacting the pistons (37) with the cam contact surface (11) and including rollers (31) interposed between the two parts of the cam drive means and being formed to run on the cam contact surface (11) in response to a relative movement of the two parts of the cam drive means, the pistons (37) being formed to move in response to the rollers (31) running on the cam contact surface (11); and means for compensating for misalignments in radial and axial directions and including a coupling (39, 97) having a spherical shape in contact with one of the two carriers (13, 13"; 33, 33') of the cam drive means, the coupling (39, 97) being rigidly connected to the other of the two carriers of the cam drive means.

Claim 5

Dependent Claim 36 words

Fuel injection pump according to claim 2, wherein the coupling part is a coupling arm projecting into a recess (41, 88) radially relative to the axis of the rotary-driven part (8, 8') of the cam drive.

Claim 6

Dependent Claim 66 words

Fuel injection pump according to claim 2, wherein the cam contact surface (118) is arranged on the essentially stationary part (93), and the distributor is formed on a piece projecting from the distributor cylinder (42) and functioning as a piston carrier (33') and is coupled, via the coupling part (97), to the rotary-driven part of the cam drive means designed as a roller-carrier (13") (FIG. 3).

Claim 7

Dependent Claim 198 words

Fuel injection pump according to claim 2, wherein the distributor (35) has an end facing the rotary-driven part (8) and a collar-like part (44) with an outer surface and a side facing away from the rotary-driven part (8), the outer surface being formed with a continuous longitudinal groove (45) with a groove bottom and a non-continuous recess (49) with a recess bottom, the recess opening out on the side of the collar-like part, the continuous longitudinal groove having at least a width equal to that of the non-continuous longitudinal groove and at most a radial distance between the groove bottom and an axis of the distributor (35) equal to a radial distance between the recess bottom and the axis of the distributor (35); and further comprising: means for bringing the distributor (35) to rest in an installed state and including a compression spring (48) clamped between the end of the distributor (35) and the rotary-driven part (8), and a radial coupling arm (46) projecting into an end of the non-continuous recess (49) and connected to the rotary-driven part (8), the compression spring (48) being formed to bring the distributor (35) to rest against the radial coupling arm (46).

Claim 8

Dependent Claim 23 words

Fuel injection pump according to claim 5, wherein the end of the coupling arm (46) projecting into the groove is of spherical shape.

Claim 9

Dependent Claim 32 words

Fuel injection pump according to claim 5 wherein the diameter of the collar-like part (44) is less than and at most equal to the diameter of the distributor cylinder (42) (FIG. 2).

Claim 10

Dependent Claim 27 words

Fuel injection pump according to claim 5 wherein the collar-like part (44) is designed as a ring fastened to the end of the distributor (35) (FIG. 1).

Claim 11

Dependent Claim 69 words

Fuel injection pump as defined in claim 2, further comprising: means for distributing fuel and including a distributor (35) having a periphery and being driven synchronously with the pistons (37) and the cam drive means, and a distributor cylinder (42) guiding the distributor (35), said distributor (35) having a distributor orifice (61) on the periphery of the distributor (35) that is connected constantly to the pump working space (53).

Claim 12

Dependent Claim 39 words

Fuel injection pump according to claim 9, wherein the distributor is formed as a shaft, the distributor being guided by the distributor cylinder (42) coaxially relative to the rotary-driven part (8) and being coupled to the rotary-driven part (8).

Claim 13

Dependent Claim 70 words

Fuel injection pump according to claim 9; and further comprising: a pump casing enclosing a suction space (6) therein; and filling orifices (55), the periphery of the distributor being formed with filling grooves (54) thereon which are connected to the filling orifices (55) during the suction stroke of the pump pistons (37) and which connect the pump working space (53) to the suction space (6) enclosed in the pump casing.

Claim 14

Dependent Claim 41 words

Fuel injection pump according to claim 11, characterized in that the filling grooves are arranged in the region of the non-rotary-driven piston-carrier part, and the filling orifices are provided in the piston-carrier part (33) arranged in the pump inner space (36).

Claim 15

Dependent Claim 32 words

Fuel injection pump according to claim 11, characterized in that the filling grooves (54') are located in the region of the distributor cylinder (42) in which the filling orifices (55') open out.

Claim 16

Dependent Claim 65 words

Fuel injection pump as defined in claim 9; and further comprising: a plurality of pressure channels (62) extending from said distributor cylinder (42) and being formed to connect to injection points (64) of an internal combustion engine via injection lines (63) of the internal combustion engine, the working space (53) being connected to a respective one of the pressure channels (62) during the suction stroke.

Claim 17

Dependent Claim 52 words

Fuel injection pump according to claim 14, wherein the cam contact surface (11) is arranged on the rotary-driven part of the cam drive means (8, 9), and the piston-carrier part (33) is mounted rotatably as an annular element on the distributor (35) and is coupled to and surrounded by the roller-carrier (13).

Claim 18

Dependent Claim 27 words

Fuel injection pump according to claim 15, wherein the rotary-driven part (8, 8') is guided on an outer periphery in a casing of the fuel injection pump.

Claim 19

Dependent Claim 48 words

Fuel injection pump according to claim 15; and further comprising: means for changing a relative position of at least the essentially stationary part of the cam drive means relative to a specific point recurring at a frequency of rotation of the rotary-driven part of the cam drive means.

Claim 20

Dependent Claim 21 words

Fuel injection pump according to claim 15, and further comprising: a pump casing in which the roller-carrier (13) is guided radially.

Claim 21

Dependent Claim 125 words

Fuel injection pump according to claim 18, wherein the pump casing consists of a pot-shaped part (1) and a cover part (2) which closes the former so that a pump inner space (6) is defined therebetween, the distributor cylinder (42) and the pressure channels (62) being arranged in the cover part (2), the distributor cylinder (42) having an axis, the cover part (2) having a cylindrical guide part (18) which is coaxial relative to the axis of the distributor cylinder (42) and projects into the pump inner space (6), the cylindrical guide part (18) being formed with a periphery on which guides the roller-carrier radially via a second step-bore part (15) of a step bore extending continuously in an axial direction to the roller-carrier (13).

Claim 22

Dependent Claim 73 words

Fuel injection pump according to claim 19, and further comprising: means for actuating the roller-carrier and including an actuating arm (22) releasably and rigidly connected to the roller-carrier (13), the actuating arm (22) having an outer end and an inner end, a servo motor (16) operatively connected to the outer end, and an annular recess (20) in which projects said inner end and against which rests said actuating arm in an axial direction.

Claim 23

Dependent Claim 136 words

Fuel injection pump according to claim 20 and further comprising: a clamping screw (89), the roller-carrier (13) having a radial passage bore (23) in which the actuating arm (22) is mounted on the roller-carrier (13), the inner end of the actuating arm (22) having a flattened portion (87) with an outward-pointing end (88) serving as an adjusting-depth stop for the actuating arm against the clamping screw (89), the clamping screw (89) screwing in transversely relative to and intersecting the radial passage bore, the radial passage bore (23) having a length, the roller-carrier (13) having an end face located on a same side as the clamping screw and having a slot over at least some of the length of the radial passage bore (23) from the end face located on the same side as the clamping screw.

Claim 24

Dependent Claim 24 words

Fuel injection pump according to claim 20, wherein the actuating arm (22) is made crowned at the end projecting into the annular recess (20).

Claim 25

Dependent Claim 57 words

Fuel injection pump according to claim 19, wherein the pot-shaped casing part (1) has a ring (91) which is arranged towards an open side axially next to the part carrying the cam contact surface and the diameter of which is at most/equal to the diameter, on which the cam bottom of the cam contact surface (11) rests.

Claim 26

Dependent Claim 21 words

Fuel injection pump according to claim 23, wherein the ring is designed as a ring inserted in the pot-shaped casing part.

Claim 27

Dependent Claim 13 words

Fuel injection pump according to claim 24, wherein the ring consists of plastic.

Claim 28

Dependent Claim 60 words

Fuel injection pump as defined in claim 14, and further comprising: means for supplying fuel and including fuel storage (58) and a filling line (54, 55), the filling line (54, 55) being in communication with the fuel storage (58), the distributor (35) being in communication with the fuel storage (58) via the filling line (54, 55) during the suction stroke.

Claim 29

Dependent Claim 73 words

Fuel injection pump as defined in claim 26; and further comprising: means for relieving pressure in the pump working space and including an electrically controlled valve (67) opening and closing in response to a predetermined pressure in the pump working space (57), the means for relieving pressure also including a relief channel (66) in communication with the distributor (35) via the electrically controlled valve (67) when the electrically controlled valve (67) is open.

Claim 30

Dependent Claim 63 words

Fuel injection pump according to claim 27 wherein the distributor (35) and the distributor cylinder (42) are formed to define an annular space (65) therebetween which is in permanent communication with the working space (53); and further comprising: a casing in which extends a relief channel (66) from the annular space (65) the relief channel (66) leading to the electrically controlled valve (67).

Claim 31

Dependent Claim 49 words

Fuel injection pump according to claim 28, wherein the casing has an end face on which is arranged the electrically controlled valve (67), the pressure channels (52) leading off all around the distributor cylinder (42), the electrically controlled valve (67) also being arranged centrally between the pressure channels (52).

Claim 32

Dependent Claim 126 words

Fuel injection pump according to claim 29, wherein the electrically controlled valve is formed as a solenoid valve having a closing member controlled by magnetic forces that is formed as a pressure-compensated needle-valve closing member (70) with an axis parallel to the axis of the distributor (35), the pressure-compensated needle-valve closing member (70) having a sealing face (72) turned towards the distributor, the sealing face (72) having a front shaped conically, the solenoid valve having a valve seat (73) on the same side as the closing member, the front of the closing member being formed to interact with the valve seat (73) to limit a portion of the relief channel (66) located on a high pressure side and connected directly to the pump working space (53).

Claim 33

Dependent Claim 27 words

Fuel injection pump according to claim 30, wherein a transverse bore (85), in which a pressure transducer (84) is arranged, branches off from the annular space (65).

Claim 34

Dependent Claim 26 words

Fuel injection pump according to claim 30, wherein the axis of the pressure-compensated needle-valve closing member (70) is coaxial to the axis of the distributor (35).

Claim 35

Dependent Claim 178 words

Fuel injection pump according to claim 27, wherein the electrically controlled valve (67) is formed as a solenoid valve with an inner space (106) closed relative to a high-pressure side, the solenoid valve having a magnetic winding arranged in the inner space, the roller-carrier (13. 13') having roller tappets (30) that are cup-shaped and mount the rollers (31) thereon, the roller tappets (30) being fitted tightly in the radial guide bores (36) of the roller-carrier (13, 13') so as to enclose a second pump working space (101) on a side facing away from the rollers (31); and further comprising: means forming a second channel (102) between the second working space (101) and the fuel storage (58); and second means for relieving pressure in the second pump working space and including a non-return valve (104) arranged in said suction channel (102), the non-return valve (104) being formed to open in a feeding direction so as to communicate the pump working space (101) with the fuel storage (58), the valve inner space (106) being located in one of the channels.

Claim 36

Dependent Claim 29 words

Fuel injection pump according to claim 33, wherein the non-return valve (104) is arranged in the suction line (102) between the solonoid valve (67) and the roller tappet (30).

Claim 37

Dependent Claim 25 words

Fuel injection pump according to claim 34, wherein a relief channel is connected permanently to the fuel store via a throttle or a non-return valve.

Claim 38

Dependent Claim 56 words

Fuel injection pump according to claim 34, wherein the second means for relieving pressure from the second pump working space (101) includes a second relief channel in communication with the second pump working space (101) and means for alternatively opening and closing the second relief channel and including an element moving synchronously with the rotary-driven part.

Claim 39

Dependent Claim 93 words

Fuel injection pump according to claim 36, wherein the electrically controlled valve (67) is closed at the start of the pumping stroke of the pump pistons (37), in order to control the injection-effective pump-piston feed stroke, and is opened in order to end the injection-effective pump feed stroke, and to adjust the start of high-pressure fuel injection the relative position of the at least essentially stationary part of the cam drive in relation to a point recurring at the frequency of rotation on the rotary-driven part of the cam drive can be changed.

Claim 40

Dependent Claim 50 words

Fuel injection pump according to claim 37, wherein the adjustment of the relative position is detected by means of a feed back member (84) and regulated according to predetermined desired values and is taken into account in the control of the moment of opening of the electrically controlled valve (67).

Claim 41

Dependent Claim 82 words

Fuel injection pump according to claim 37, characterized in that pilot control means for adjusting the relative position as a function of operating parameters, after the start of the feed stroke the injection start is regulated as a result of the control of the moment of closing of the electrically controlled valve (67), and the end of the injection time and consequently of the injection quantity is controlled or regulated by means of the moment of reopening of the electrically controlled valve.

Claim 42

Dependent Claim 33 words

Fuel injection pump according to claim 37, further comprising: means for adjusting the relative position and including a servo-motor (16) adjusting the relative position as a function of at least one operating parameter.

Claim 43

Dependent Claim 25 words

Fuel injection pump according to claim 40, wherein the servo-motor (16) adjusts the relative position as a function of a speed of the internal-combustion engine.

Claim 44

Dependent Claim 24 words

Fuel injection pump according to claim 40, wherein the servo-motor has a regulating piston(27) subjected to a control pressure counter to a spring force.

Claim 45

Dependent Claim 54 words

Fuel injection pump according to claim 42, wherein the control pressure can be varied as a result of an inflow and an out-flow, controlled by an electrical valve (78), of the working space (75) which is limited by the regulating piston (27) and which is supplied with fuel under pressure from a pressure source.

Claim 46

Dependent Claim 24 words

Fuel injection pump according to claim 43, wherein the electrically controlled valve (78) is actuated in a timed manner with a variable timing ratio.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1994-09-23	1995-03-25	1995-09-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1998-09-23	1999-03-25	1999-09-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2002-09-23	2003-03-25	2003-09-24	$7700.00	Window Closed / Lapsed

Fuel injection pump for internal-combustion engines

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