US 5,685,274 A · Fuel-injection pump

A fuel injection pump of the distributor type for supplying a plurality of injection nozzles (29) of internal-combustion engines, which comprises, a rotating drive shaft (13) mounted in a pump casing (10), a distributor shaft (19) which is coupled fixedly in terms of rotation to the drive shaft (13) and which, during rotation, successively makes a connection between a pump working space (22) integrated in said pump and one of the injection nozzles (29), and with pump pistons (21) which are each seated axially displaceably in a radial bore (20) of the distributor shaft (19) and which by means of one end face, each pump piston limits the pump working space (22) and by means of another end face of each of said pump pistons, via rollers (24) held rotationally movably in roller shoes (23), bear non-positively on a cam track (25) of a cam ring (26) coaxialy relative to the distributor shaft (19) and fixed in the pump casing (10), wherein a stub-like coupling head (34) that engages the distributor shaft (19) in a cup like manner is formed at one end of the drive shaft (13) facing the distributor shaft (19), the rotationally fixed coupling between the drive shaft (13) and distributor shaft (19) takes place by means of a coupling disk (37;

37') which is seated in axial slots (35;
35') in the coupling head (34;
34') by means of radial coupling webs (371-374;
371'-373) that project radially on the disk circumference in one piece with the coupling disk (37;
37') and which positively receives a projection end (39) on an end face of the distributor shaft (19) in a control recess (38), a positive connection between the radial coupling webs (371-374;
371'-373') of the coupling disk (37;
37') and the axial slots (35' 35') in the coupling head (34' 34'), on the one hand, and between the central recess (38) in the coupling disk (37;
37') and the end projection (39) of the distributor shaft (19), on the other hand, is such that there is a supporting articulation of the drive shaft (11) and distributor shaft (19), the coupling disk (37) has at least two radial coupling webs (371, 372, 373, 374;
371' 372' 373') offset from one another, of which two radial coupling webs form an angle greater than 90.degree. with one another and rest without play in the axial slots (35);
the recess (38) in the coupling disk (37) has two parallel sides extending at right angles to at least one of the coupling webs that rest without play in the axial slots (35), on which the sides of the face-end projection (39) of the distributor shaft (19) rests with projection faces parallel to one another, the length of said projection faces is greater than the face end projections located perpendicular to said projection faces, said latter faces are spaced apart from corresponding boundaries of the recess (38), and the coupling lands that are not guided with play engage the axial slots with lateral play, and wherein the two remaining coupling webs (372, 374) of the coupling disk (37) which are located diametrically opposite one another are seated with play in the circumferential direction in the associated axial slots (35) in the coupling head (34).

7 more elements

A fuel injection pump of the distributor type for supplying a plurality of injection nozzles (29) of internal-combustion engines, which comprises, a rotating drive shaft (13) mounted in a bearing bush (14) supported in a central bore (12) in a pump casing (10) near an exit of said drive shaft (13) from said pump housing, said drive shaft (13) is affected by a ball bearing (41) between a coupling head (34) and the pump casing (10) with said ball bearing supported radially and axially on the coupling head (34), a distributor shaft (19) is coupled fixedly in terms of rotation to the drive shaft (13) and which, during rotation, successively makes a connection between a pump working space (22) integrated in said pump and one of the injection nozzles (29), and with pump pistons (21) which are each seated axially displaceably in a radial bore (20) of the distributor shaft (19) and which by means of one end face, each pump piston limits the pump working space (22) and by means of another end face of each of said pump pistons, via rollers (24) held rotationally movably in roller shoes (23), bear non-positively on a cam track (25) of a cam ring (26) coaxialy relative to the distributor shaft (19) and fixed in the pump casing (10), said coupling head (34) engages the distributor shaft (19) in a cup like manner and is formed at one end of the drive shaft (13) facing the distributor shaft (19), wherein the coupling head (34) has an axial portion (341) of reduced diameter on a free end face, wherein a thrust washer (40) bears on an annular shoulder (342) formed at a transition to the axial portion of reduced diameter, and wherein an inner bearing ring (42) of the ball bearing (41) bears on the axial portion (341) of reduced diameter of the coupling head (34) and axially on the thrust washer (40).

A fuel injection pump of the distributor type for supplying a plurality of injection nozzles ( 29 ) of internal-combustion engines, which comprises, a rotating drive shaft (13) mounted in a bearing bush (14) supported in a central bore (12) in a pump casing (10) near an exit of said drive shaft (13) from said pump housing, said drive shaft (13) is affected by a ball bearing (41) between a coupling head (34) and the pump casing (10) with said ball bearing supported radially and axially on the coupling head (34), a distributor shaft (19) is coupled fixedly in terms of rotation to the drive shaft (13) and which, during rotation, successively makes a connection between a pump working space (22) integrated in said pump and one of the injection nozzles (29), and with pump._pistons (21) which are each seated axially displaceably in a radial bore (20) of the distributor shaft (19) and which by means of one end face, each pump piston limits the pump working space (22) and by means of another end face of each of said pump pistons, via rollers (24) held rotationally movably in roller shoes (23), bear non-positively on a cam track (25) of a cam ring (26) coaxialy relative to the distributor shaft (19) and fixed in the pump casing (10), said coupling head (34) that engages the distributor shaft (19) in a cup like manner and is formed at one end of the drive shaft (13) facing the distributor shaft (19), wherein an inner bearing ring (42) of the ball bearing (41) is pressed against a thrust washer (40) onto an axial portion (341) of reduced diameter of the coupling head (34) and is retained by means of a retaining ring (45) inserted in an annular groove (46) in an axial portion (341).

A fuel injection pump of the distributor type for supplying a plurality of injection nozzles (29) of internal-combustion engines, which comprises, a rotating drive shaft (13) mounted in a bearing bush (14) supported .in a central bore (12) in a pump casing (10) near an exit of said drive shaft (13) from said pump housing, said drive shaft (13) is affected by a ball bearing (41) between a coupling head (34) and the pump casing (10) with said ball bearing supported radially and axially on the coupling head (34), a distributor shaft (19) is coupled fixedly in terms of rotation to the drive shaft (13) and which, during rotation, successively makes a connection between a pump working space (22) integrated in said pump and one of the injection nozzles (29), and with pump pistons (21) which are each seated axially displaceably in a radial bore (20) of the distributor shaft (19) and which by means of one end face, each pump piston limits the pump working space (22) and by means of another end face of each of said pump pistons, via rollers (24) held rotationally movably in roller shoes (23), bear non-positively on a cam track (25) of a cam ring (26) coaxialy relative to the distributor shaft (19) and fixed in the pump casing (10), said coupling head (34) that engages the distributor shaft (19) in a cup like manner and is formed at one end of the drive shaft (13) facing the distributor shaft (19) wherein an outer bearing ring (43) of the ball bearing (41) is supported in an axial direction on a casing shoulder (101) in the pump casing (10) and is clamped against the casing shoulder (101) by a distributor body (11) inserted into the pump casing (10) on an end face and receives the distributor shaft (19).

Fuel-injection pump

Life of this patent

Fuel-injection pump

Life of this patent

Abstract

Claims18