公开(公告)号：WO1985004450A1

公开(公告)日：1985-10-10

申请号：PCT/US1984000724

申请日：1984-05-10

Applicant: CATERPILLAR TRACTOR CO.

Inventor： CATERPILLAR TRACTOR CO. ,  GIBSON, Dennis, H. ,  STOCKNER, Alan, R. ,  WALDMAN, Donald, J.

IPC: F02M41/06

CPC classification number: F02M41/06 ,  F02B2075/027

Abstract: In the use of fuel injection pumps, a distributing rotor is often utilized to sequentially deliver fuel from an inlet to a combustion chamber on an engine in combination with one or more reciprocating high pressure pistons. Due to the positioning of the various passages through which the fuel is directed, cavitation of the pump is often experienced which has a very serious effect on the life of the components within the pump. The fluid distribution apparatus (10) of the present invention provides a single delivery passage (58, 60) between the pumping chambers (22, 24) of the reciprocating pistons (26, 28) and the distributing rotor (82). With this arrangement, fluid that is communicated from the bore (54) to the pumping chambers (22, 24) in response to the intake stroke of the pistons (26, 28) is directed back through the same passage (58, 60) during the pressurization stroke of the pistons (26, 28). The positioning of the single delivery passages (58, 60) prevents the fuel injection pump from experiencing the severe cavitation that is common with previous designs and thus the fore-shortened life of the pump components.

公开(公告)号：WO1985004447A1

公开(公告)日：1985-10-10

申请号：PCT/US1984000708

申请日：1984-05-10

Applicant: CATERPILLAR TRACTOR CO.

Inventor： CATERPILLAR TRACTOR CO. ,  BAILEY, John, M. ,  GIBSON, Dennis, H. ,  HACKETT, David, E. ,  STOCKNER, Alan, R. ,  WALDMAN, Donald, J.

IPC: F02M41/06

CPC classification number: F02M59/04 ,  F02B2075/025 ,  F02B2075/027 ,  F02B2275/14 ,  F02M41/06 ,  Y02T10/123

Abstract: Previously disclosed distributor fuel injection pumps for internal combustion engines offer the advantages of reduced size, weight, and cost of a fuel injection system. However, these pumps have not been able to provide relatively high fuel injection pressures which could improve fuel combustion for better fuel economy and lower noxious emissions. In contrast, the subject distributor fuel injection pump (14) generates relatively high fuel injection pressures in a relatively compact arrangement. A semi-spherical nutator member (74) freely rotatably mounted on an oblique journal (66) of a drive shaft (38) imparts high speed harmonic motion to at least one reciprocating pump plunger (310, 314) for pressurizing the fuel. A relatively large semi-spherical bearing interface (82, 86) between the nutator member and a pump housing (34) accomodates very high pumping reaction loads. A distributor rotor (348) for sequentially delivering the pressurized fuel to more than one engine combustion cylinder is rotatively driven by a planetary gear reduction mechanism (392, 396, 424, 428, 432, 436, 440, 444, 448) coupled to the drive shaft. Very little force is required to adjust either the timing or quantity of fuel injection which are adjustable by angular movement of at either a normally stationary planetary ring gear (396) or a fuel metering collar (146), respectively.

公开(公告)号：WO1985004448A1

公开(公告)日：1985-10-10

申请号：PCT/US1984000719

申请日：1984-05-09

Applicant: CATERPILLAR TRACTOR CO.

Inventor： CATERPILLAR TRACTOR CO. ,  BALLY, Fred, R. ,  WALDMAN, Donald, J.

IPC: F02M41/06

CPC classification number: F02M41/06

Abstract: A bypass restrictor arrangement is provided for use in a distribution valve (14) to control the rate of bypass flow thus effectively reducing cavitation in a fuel system at the end of the injection stroke. Others primarily rely on operation at low system pressure or they rely on a relief valve to maintain a predetermined pressure level in the bypass passage. In the subject arrangement, an orifice (70) is located in a bypass port (43) of a rotor (42) prior to the bypass fluid communicating with a low pressure chamber (64). Furthermore, the low pressure chamber (64) is maintained at a predetermined pressure level by a relief valve (83). This arrangement ensures that the rate of fuel flow during bypass is controlled while also flushing and/or controlling the size of any entrained air bubbles or voids thus increasing the efficiency of the fuel system.