公开(公告)号：US10024311B2

公开(公告)日：2018-07-17

申请号：US14820326

申请日：2015-08-06

Applicant: Caterpillar Inc.

Inventor： Cory A. Brown ,  Adrienne M. Brasche ,  Daniel R. Baldwin ,  Sudhindra K. Ayanji ,  Joshua W. Steffen

IPC: F04B15/08 ,  F04B23/02 ,  F04B37/08

Abstract: A cryogenic pump for pumping liquefied natural gas (LNG) from a cryogenic tank storing LNG includes a drive assembly and a pump assembly disposed along a pump axis. The drive assembly includes a spool housing having a plurality of spool valves arranged around the pump axis, a tappet housing having a plurality of tappet bores with slidable tappets arranged around the pump axis, and spring housing including a plurality of movably disposed pushrods urged upward by a plurality of associated pushrod springs. Hydraulic fluid received by a hydraulic fluid inlet in the drive assembly is directed by the spool valves to the tappet bores to move the tappets downward against the pushrods. To collect the hydraulic fluid, the lowermost spring housing also includes a collection cavity formed therein that can return the hydraulic fluid to a hydraulic fluid outlet.

公开(公告)号：US09945364B2

公开(公告)日：2018-04-17

申请号：US14798058

申请日：2015-07-13

Applicant: Caterpillar Inc.

Inventor： Joshua W. Steffen ,  Dana R. Coldren

IPC: F04B15/08 ,  F04B9/113 ,  F04B53/04 ,  F04B9/117

CPC classification number: F04B15/08 ,  F04B9/113 ,  F04B9/1172 ,  F04B53/04 ,  F04B2015/081

Abstract: A pump has a pump body and at least first and second pumping elements, each pumping element including a piston defining a head-end and a rod-end. The pump receives a pressurized fluid at an inlet, and returns fluid through a drain outlet. A hydraulic distributor operates to fluidly connect the head end of an extending piston to the pressurized fluid, and the rod end of the extending piston to the drain outlet. The hydraulic distributor further connects the rod-end of a retracting piston to the drain outlet, and the rod-end of one or more retracting pistons to the drain or to a return pressure, which is lower than an extending pressure.

公开(公告)号：US20180059700A1

公开(公告)日：2018-03-01

申请号：US15246909

申请日：2016-08-25

Applicant: Caterpillar Inc.

Inventor： Joshua W. Steffen ,  Gregory S. Hasler ,  Dachuan Yu

IPC: G05F1/66 ,  H02K7/18 ,  H02P9/00 ,  H02J3/38 ,  H02J3/46 ,  G05B23/02

CPC classification number: G05F1/66 ,  G05B23/0289 ,  G05B2219/32184 ,  H02J3/38 ,  H02J3/383 ,  H02J3/46 ,  H02K7/1815

Abstract: A micro grid power system includes a plurality of generator sets, a photovoltaic system, an external load, and a controller. Each generator set includes an engine and a sensor to determine a temperature of exhaust gases exiting the engine. The photovoltaic system includes a plurality of photovoltaic panels for generating power. The external load is powered by the plurality of generator sets and the photovoltaic system. The controller is configured to determine the external load, and control the plurality of generator sets to maintain the temperature above a threshold temperature. The controller is further configured to determine a remaining load which is the external load subtracted by a portion of the external load powered by the plurality of generator sets, and control the photovoltaic system to power the remaining load.

公开(公告)号：US20160201659A1

公开(公告)日：2016-07-14

申请号：US14597019

申请日：2015-01-14

Applicant: Caterpillar Inc.

Inventor： Bryan E. Nelson ,  Daniel R. Baldwin ,  Alan R. Stockner ,  Robert M. Campion ,  Cory A. Brown ,  Joshua W. Steffen ,  Dana R. Coldren ,  Sana Mahmood

IPC: F04B27/10 ,  F16C23/08 ,  F16C19/54

CPC classification number: F04B27/1054 ,  F04B27/1063 ,  F04B37/08 ,  F16C19/06 ,  F16C19/30 ,  F16C19/547 ,  F16C23/086 ,  F16C2360/00

Abstract: A bearing arrangement for a wobble plate piston pump includes first, second, third, and fourth bearing assemblies. The first and second bearing assemblies support the drive shaft portion for rotation within the housing about the central longitudinal axis, while the third and fourth bearing assemblies support the load plate for rotation relative to the offset shaft portion of the shaft. The second bearing assembly is distally disposed from the first, the third disposed distally to second, and the fourth disposed distally to third. The fourth bearing assembly is the most distally disposed bearing assembly along the shaft.

Abstract translation: 摆动板活塞泵的轴承装置包括第一，第二，第三和第四轴承组件。 第一和第二轴承组件支撑驱动轴部分，用于围绕中心纵向轴线在壳体内旋转，同时第三和第四轴承组件支撑负载板以相对于轴的偏心轴部分旋转。 第二轴承组件从第一轴向组件向远侧设置，第三轴向组件向远侧配置到第二轴承组件，而第四轴向组件向远侧配置到第二轴承组件。 第四轴承组件是沿着轴的最远端布置的轴承组件。

公开(公告)号：US20140182551A1

公开(公告)日：2014-07-03

申请号：US13727811

申请日：2012-12-27

Applicant: CATERPILLAR INC.

Inventor： Joshua W. Steffen

IPC: F02M21/02

CPC classification number: F02D19/0647 ,  F02D19/0623 ,  F02D19/0684 ,  F02D19/0689 ,  F02D19/0694 ,  F02D19/10 ,  F02M21/06 ,  F02M43/04 ,  F02M47/02 ,  F02M63/0225 ,  F02M2200/44 ,  Y02T10/36

Abstract: The disclosure describes an engine system having liquid and gaseous fuel systems, each of which injects fuel directly into an engine cylinder. A controller controls pumping of a liquefied natural gas (LNG) in the gaseous fuel system. In a pump cycle, a pumping piston is moved in an intake direction over an intake stroke such that the pumping piston produces a negative pressure that draws LNG from a tank fluidly connected to the pumping element into a pumping chamber of a body of the pumping element. The pumping piston is moved in an opposing power direction over a power stroke such that the pumping piston pumps compressed LNG out of the pumping chamber away from the tank. The pumping piston is moved over the intake stroke with an average intake velocity and over the power stroke with an average power velocity, which is greater than the average intake velocity.

Abstract translation: 本公开描述了一种具有液体和气体燃料系统的发动机系统，每个燃料系统将燃料直接喷射到发动机气缸中。 控制器控制气体燃料系统中的液化天然气（LNG）的抽吸。 在泵循环中，泵送活塞在进气行程上沿进气方向移动，使得泵送活塞产生负压，其将LNG从流体连接到泵送元件的罐吸入泵送元件的主体的泵送室 。 泵送活塞在动力冲程上以相反的动力方向移动，使得泵送活塞将压缩的LNG从泵送室泵出远离罐。 抽吸活塞以平均进气速度和功率冲程移动进气行程，平均功率速度大于平均进气速度。

公开(公告)号：US20140137572A1

公开(公告)日：2014-05-22

申请号：US13680333

申请日：2012-11-19

Applicant: CATERPILLAR INC.

Inventor： Joshua W. Steffen

IPC: F17C7/04

CPC classification number: F17C7/04 ,  F17C2203/03 ,  F17C2205/0332 ,  F17C2221/033 ,  F17C2223/0161 ,  F17C2223/033 ,  F17C2227/0135 ,  F17C2227/0302 ,  F17C2250/01 ,  F17C2260/044 ,  F17C2265/037 ,  F17C2265/066 ,  F17C2270/0168

Abstract: A natural gas fuel system is provided. The system includes a vent gas recapture tank, a liquid natural gas (LNG) storage tank operably connected to the vent gas recapture tank, and a pressure control regulator operably connected to the vent gas recapture tank and the LNG storage tank. Vent gas is released from at least one point on the fuel system and stored in the vent gas recapture tank when certain conditions are met.

Abstract translation: 提供天然气燃料系统。 该系统包括排放气体再捕获罐，可操作地连接到排放气体再捕获罐的液体天然气（LNG）储存罐，以及可操作地连接到排气回收罐和LNG储罐的压力调节调节器。 当满足某些条件时，排放气体从燃料系统上的至少一个点释放出来，并被储存在排放气体再捕集罐中。