CN106795844A - 用于将燃料、优选柴油供应至内燃机的泵单元 - Google Patents

用于将燃料、优选柴油供应至内燃机的泵单元 Download PDF

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CN106795844A
CN106795844A CN201580054351.3A CN201580054351A CN106795844A CN 106795844 A CN106795844 A CN 106795844A CN 201580054351 A CN201580054351 A CN 201580054351A CN 106795844 A CN106795844 A CN 106795844A
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pump unit
head
cylinder
covering
valve
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V·米农诺
A·德卢卡
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/025—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by a single piston
    • F02M59/027—Unit-pumps, i.e. single piston and cylinder pump-units, e.g. for cooperating with a camshaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/105—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive hydraulic drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/464—Inlet valves of the check valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48—Assembling; Disassembling; Replacing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0421—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F04B1/063—Control by using a valve in a system with several pumping chambers wherein the flow-path through the chambers can be changed, e.g. between series and parallel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/007—Cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F04B23/103—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type being a radial piston pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/166—Cylinder liners
    • F04B53/168—Mounting of cylinder liners in cylinders

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

一种用于将燃料、优选柴油供应至内燃机的泵单元，该泵单元具有至少两个缸(10)，所述缸在至少一个机头(9)中形成且可滑动地接合于相应的活塞(13)，并且通过相应的插入式进气阀(15)与缸(10)中的相应的燃料入口(11)液压地连通，所述插入式进气阀设有包括在机头(9)中的相应的阀体(16)；所有缸(10)的入口(11)被单个覆盖件(33)闭合，所述单个覆盖件被固定于所述机头(9)上。

Description

用于将燃料、优选柴油供应至内燃机的泵单元
技术领域
本发明涉及一种用于将燃料、优选柴油供应至内燃机的泵单元。
特别地，本发明涉及如下类型的泵单元，其包括用于将燃料供应至内燃机的高压泵和用于将燃料供应至高压泵的预供应泵。
背景技术
一般来说，高压泵包括泵体，该泵体具有一个中心孔和至少两个侧向孔，所述侧向孔具有各自的纵轴线，这些纵轴线相互平行且垂直于所述中心孔的纵轴线并且朝向该中心孔。
每个侧向孔的内部均安置有管状机头，所述管状机头包括一收缩部分和一加宽部分，该收缩部分构成所述高压泵的缸，该加宽部分在环形凸肩上连接至所述收缩部分。
燃料通过一进气阀被供应至所述缸内，该进气阀包括一阀体以及一闸门件，该阀体与环形凸肩接触地被安装在加宽部分中，该闸门件被安装穿过所述阀体，以使该闸门件能在所述进气阀的打开位置与关闭位置之间移动。
所述机头在轴向上被一栓塞封闭，该栓塞被拧入所述加宽部分，以使所述阀体能抵着所述环形凸肩在轴向上锁定。
每个机头还具有一管道，该管道用于将燃料供应至所述机头的加宽部分且随后供应至所述进气阀，每个机头的内部安置有一输送阀，该输送阀用于有选择性地控制内燃机的燃料供应。
所述缸可滑动地接合于各自的活塞，所述活塞可在由驱动装置所提供的作用力下沿着对应的缸以往返直线移动的方式移动，所述驱动装置包括：一传动轴，该传动轴被可旋转地安装穿过前述的泵体中心孔，以及所述驱动装置(对于各活塞)包括一各自的弹簧，该弹簧被安插在所述机头与所述活塞之间。
通过对应的弹簧使每个活塞在一冲程中移动，以将燃料供入对应缸；又通过所述传动轴使每个活塞在一冲程中移动，以将燃料从对应缸供应至内燃机。
由于每个机头都包括对应供应管道的结构及对应加宽部分的螺纹，已知的上述类型泵单元具有许多缺点，主要是因为对应机头的生产周期相对复杂且昂贵。
此外，由于每个机头中封闭栓塞的存在，因此泵单元具有相对较多的零件数量和相对较长的组装时间，而同时，因为用于将燃料供应至所述缸的管道的存在，因此机头的总尺寸和总重量都相对较高。
发明内容
本发明的目的是提供一种用于将燃料、优选柴油供应至内燃机的泵单元，该泵单元不具有前文所述的缺点，并且能简单而经济地进行制造。
根据本发明，如所附权利要求书中所述，一泵单元被提供用于将燃料、优选柴油供应至内燃机。
附图说明
接下来参照附图描述本发明，附图为剖视图，并且为了清晰起见而移除了一些部件，附图示出了本发明的非限制的示例性实施方式。
具体实施方式
参照附图，附图标记1表示整个泵单元，该泵单元用于将燃料、优选将柴油供应至内燃机(未示出)。
泵单元1包括一用于将燃料供应至前述内燃机(未示出)的高压泵(在本示例中为活塞泵2)，以及包括一用于将燃料供应至泵2的预供应泵(在本示例中为齿轮泵3)。
本发明中，泵2包括一泵体4，所述泵体4设置有一中心孔5，该中心孔5具有一纵轴线6；所述泵体4还设置有多个侧向孔7(在本示例中为两个侧向孔7)，所述侧向孔7具有各自的纵轴线8，这些纵轴线8相互平行且垂直于轴线6，且所述侧向孔7面向孔5。
每个孔7的内部均安置一管状机头9，所述管状机头9固定于泵体4、伸入到孔7中、且围绕对应轴线8延伸。
每个机头9均包括一收缩部分，所述收缩部分构成了泵2的缸10；每个管状机头9还包括一加宽部分11，所述加宽部分11被一自由端部表面12在轴向上限界，该自由端部表面12垂直于对应轴线8，且与另一机头9的表面12共面。
每个缸10可滑动地接合于活塞13，所述活塞13突出到缸10外，并与缸10一起构成一容积可变的腔14。
腔14通过插入式进气阀15与部分11连通，所述插入式进气阀15包括一阀体16，该阀体16被包括于机头9之中、与机头9一起形成单件式、且由一环状凸缘构成(所述环状凸缘径向地伸向机头9的侧向表面的内侧)、且与轴线8同轴地延伸。
阀15还包括一闸门件17，所述闸门件17穿过阀体16且与轴线8同轴地延伸，所述闸门件17可在阀15的打开位置与关闭位置之间移动，且通过一(安插于机头9与件17之间的)弹簧18被移动至、并通常保持在阀15的关闭位置。
腔14还与一管道(未示出)连接，以便通过在机头9中形成的一已知类型的输送阀19，将燃料输送至内燃机(未示出)。
通过驱动装置20使活塞13沿着对应缸10以往返直线移动的方式移动，所述移动包括：将燃料供入对应腔14的冲程，以及将燃料输送至内燃机(未示出)的冲程。
对于每个活塞13，装置20包括一各自的管状套管21，该套管21可滑动地接合在对应孔7内、围绕对应的缸10延伸、且具有一环状凸缘22，该环状凸缘22径向地伸入所述套管21，用于将该套管21划分为两个筒状部分23和24，其中，所述部分24朝向孔5。
对于每个套管21，装置20还具有一各自的凸轮从动件25，所述凸轮从动件25包括一基本上为筒状的耦合块26，所述耦合块26被安装在对应部分24内、且被定位成与对应环状凸缘22接触、且借由过盈配合在对应部分24内被锁定。
凸轮从动件25还包括一凸轮从动滚轮27，该凸轮从动滚轮27从块26伸向孔5、且与块26可旋转地耦合，以至于该凸轮从动滚轮27能绕自身的纵轴线28相对于块26旋转，所述纵轴线28基本上垂直于对应轴线8。
部分23的内部安置一环状板29，所述环状板29围绕活塞13与轴线8同轴地延伸、且具有一轴向地朝向活塞13头的内周边和一朝向凸缘22的外周边。
对于每个活塞13，装置20还包括一各自的柱形弹簧30，所述柱形弹簧30被安装在对应孔7的内部、且在对应机头9和对应套管21之间与对应轴线8同轴地延伸。
弹簧30被安插在对应机头9与对应板29之间，用于将板29定位成、并通常保持成与对应凸缘22和对应活塞13接触；将活塞13定位成、并通常保持成与对应凸轮从动件25接触；且将对应凸轮从动滚轮27定位成、并通常保持成与相应的凸轮31接触，所述凸轮31形成于传动轴32的外表面上，该传动轴32被安装穿过孔5，以至于使该传动轴32能绕轴线6相对于泵体4旋转。
泵单元1还包括单个覆盖件33，用于封闭所有机头9的加宽部分11，以及包括一液压回路34，用于将燃料供应至部分11且随后供应至腔14。
覆盖件33包括：封闭板35，该封闭板35被定位成与表面12接触；和定心杆36，该定心杆36从板35垂直地突向所述表面12、且接合于两个机头9之间。
回路34完全在机头9之外形成、且包括一分配歧管37，所述分配歧管37(在本示例中)依次包括：一通过泵体4形成的第一部分38以及一通过覆盖件33形成的第二部分39。
对于每个缸10，回路34还包括相应的供应管道40，所述供应管道40通过覆盖件33形成，以使歧管37和对应部分11相互连通。
由于供应管道40是通过覆盖件33而不是通过机头9形成，因此机头9具有相对较小的尺寸、总尺寸及重量。
由于进气阀15的阀体16被包括在机头9之中，因腔14中装载的燃料的压缩而产生的力作用在机头9上，而不是作用在覆盖件33上，因此，覆盖件33能由相对便宜的材料(如铝或塑料材料)制成。
此外，单个覆盖件33的存在使得泵单元1的零件数量和组装时间得以减少成为可能。
根据一些未示出的变形方案：
省去所述两个机头9，且由包括两个缸10的单个机头代替；
省去所述分配歧管37，且由完全通过覆盖件33形成的分配歧管代替；
所述覆盖件33覆盖了在其内部安置的至少一个流量调节阀，该流量调节阀用于调节供应至缸10的燃料的流量。

Claims (12)

1.一种用于将燃料、优选将柴油供应至内燃机的泵单元，该泵单元包括用于将燃料供应至内燃机的高压泵(2)以及用于将燃料供应至高压泵(2)的预供应泵(3)；所述高压泵(2)包括：至少两个缸(10)，其具有各自的相互平行的纵轴线(8)；活塞(13)，其可滑动地接合在每个缸(10)内；至少一个机头(9)，每个机头(9)均具有至少一个通孔，所述通孔与对应的所述纵轴线(8)共轴，且每个机头(9)还均包括第一部分以及第二部分，该第一部分形成对应的所述缸(10)，该第二部分形成所述缸(10)的燃料入口(11)；并且，对于每个缸(10)，相应的进气阀(15)被安插在缸(10)与对应的入口(11)之间，用以选择性地控制所述缸(10)的燃料供应；每个进气阀(15)均包括阀体(16)和闸门件(17)，所述闸门件能够穿过阀体(16)在所述进气阀(15)的打开位置与关闭位置之间移动；其特征在于，每个进气阀(15)的阀体(16)均能与所述至少一个机头(9)形成单件式；且所有所述入口(11)都被单个覆盖件(33)封闭，该单个覆盖件被固定于所述至少一个机头(9)。
2.如权利要求1所述的泵单元，该泵单元包括多个管状机头(9)，所述管状机头的数量等于缸(10)的数量，每个缸(10)分别形成在对应的机头(9)中。
3.如权利要求1或2所述的泵单元，其中，所述入口(11)在所述至少一个机头(9)的端部表面(12)处在轴向上向外打开；所述覆盖件(33)被安装成与所述端部表面(12)接触。
4.如前述权利要求中任一项所述的泵单元，该泵单元还包括液压回路(34)，所述液压回路用于将燃料供应至所述缸(10)的入口(11)，所述液压回路(34)完全形成在所述至少一个机头(9)之外。
5.如权利要求4所述的泵单元，其中，所述液压回路(34)完全通过所述覆盖件(33)形成。
6.如权利要求4所述的泵单元，该泵单元还包括泵体(4)，所述泵体配置成用于容纳和保持所述至少一个机头(9)，所述液压回路(34)部分地通过所述泵体(4)并且部分地通过覆盖件(33)形成。
7.如权利要求4至6中任一所述的泵单元，其中，所述液压回路(34)包括至少一个调节阀，该调节阀用于选择性地控制供应至所述入口(11)的燃料的流量，所述调节阀被安装在所述覆盖件(33)中。
8.如权利要求4至7中任一所述的泵单元，其中，所述液压回路(34)包括分配岐管(37)，所述分配岐管至少部分地通过所述覆盖件(33)形成，所述液压回路对于每个入口(11)还包括相应的供应管道(40)，所述供应管道在分配岐管(37)与入口(11)之间延伸，并且所述供应管道完全通过所述覆盖件(33)形成。
9.如前述权利要求中任一项所述的泵单元，该泵单元对于每个缸(10)还包括相应的输送阀(19)，所述输送阀被安装在所述至少一个机头(9)中，用于选择性地控制向内燃机的燃料供应。
10.如前述权利要求中任一项所述的泵单元，该泵单元还包括驱动装置(20)，所述驱动装置用于使所述活塞(13)能够沿着对应缸(10)以往返直线移动的方式移动；所述驱动装置(20)包括传动轴(32)，所述传动轴被安装用于绕着旋转轴线(6)旋转，所述旋转轴线垂直于所述缸(10)的纵轴线(8)。
11.如前述权利要求中任一项所述的泵单元，该泵单元包括两个所述机头(9)，所述机头呈管状，所述机头绕着对应缸(10)的纵轴线(8)延伸并且被相应的端部表面(12)在轴向上限界，所述端部表面相互共面且垂直于所述纵轴线(8)，所述覆盖件(33)包括封闭板(35)以及定心杆(36)，所述封闭板被定位成与端部表面(12)接触，所述定心杆平行于所述纵轴线(8)从封闭板(35)伸出并且接合在两个机头(9)之间。
12.如前述权利要求中任一项所述的泵单元，其中，所述覆盖件(33)由铝或塑料制成。
CN201580054351.3A 2014-10-09 2015-09-28 用于将燃料、优选柴油供应至内燃机的泵单元 Pending CN106795844A (zh)

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