WO2019237346A1 - 燃油泵挺柱 - Google Patents

燃油泵挺柱 Download PDF

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Publication number
WO2019237346A1
WO2019237346A1 PCT/CN2018/091567 CN2018091567W WO2019237346A1 WO 2019237346 A1 WO2019237346 A1 WO 2019237346A1 CN 2018091567 W CN2018091567 W CN 2018091567W WO 2019237346 A1 WO2019237346 A1 WO 2019237346A1
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WO
WIPO (PCT)
Prior art keywords
fuel pump
cam contact
contact portion
pump tappet
cylindrical
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PCT/CN2018/091567
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English (en)
French (fr)
Inventor
刘正东
王秀丽
Original Assignee
舍弗勒技术股份两合公司
刘正东
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 舍弗勒技术股份两合公司, 刘正东 filed Critical 舍弗勒技术股份两合公司
Priority to CN201880085823.5A priority Critical patent/CN111601964B/zh
Priority to PCT/CN2018/091567 priority patent/WO2019237346A1/zh
Publication of WO2019237346A1 publication Critical patent/WO2019237346A1/zh

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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
    • F02M59/10—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

Definitions

  • the invention relates to a fuel pump tappet.
  • a fuel pump tappet In the fuel supply system of the engine, in order to convert the rotary motion of the camshaft into the reciprocating motion of the plunger, a fuel pump tappet needs to be provided between the camshaft and the plunger to achieve this conversion.
  • the roller fuel pump tappet includes a cylindrical casing 10, a gasket 20, an outer ring 30, a plurality of needle rollers 40, and a pin shaft 50.
  • the cylindrical case 10 has a hollow cylindrical shape, and a hollow portion inside the cylindrical case 10 is penetrated in the axial direction A of the cylindrical case 10.
  • the side wall of the cylindrical case 10 is formed with two inner recessed portions 101 that are hollowed toward the inside, and the two inner recessed portions 101 are opposed to each other across the central axis of the cylindrical case 10.
  • a substantially central portion of the side wall of the cylindrical case 10 in the axial direction A is formed with a through hole 102 and a locking portion 103 protruding from a hollow portion of the cylindrical case 10 toward the inside,
  • the through hole 102 and the engaging portion 103 are opposed to each other across the central axis of the cylindrical case 10, and the through hole 102, the engaging portion 103 and the two inner recesses 101 are staggered in the circumferential direction of the cylindrical case 10.
  • the gasket 20 is attached to a substantially central portion of the cylindrical case 10 in the axial direction A.
  • the gasket 20 includes a gasket body 201 and first and second mounting portions 202 and 203 protruding from both sides of the gasket body 201 in the radial direction R.
  • the first mounting portion 202 projects into and extends from the through hole 102 of the cylindrical case 10, and the second mounting portion 203 is engaged with the engaging portion 103 of the cylindrical case 10.
  • the other axial ends (lower ends in Figs. 1a and 1b) of the two inner recessed portions 101 of the cylindrical casing 10 can abut against the gasket body 201 to support the gasket 20.
  • the first mounting portion 202 is mated with the through hole 102
  • the second mounting portion 203 is mated with the engaging portion 103
  • the two inner recessed portions 101 are mated with the gasket body 201, so that the gasket 20 is mounted on the cylindrical casing 10 In the central part in the axial direction A.
  • the washer body 201 is formed in a shape protruding toward the other end side in the axial direction, and the washer body 201 is used to abut a plunger that extends into the cylindrical case 10 from the other end side in the axial direction.
  • the pin shaft 50 is mounted on the cylindrical case 10, and both ends of the pin shaft 50 are respectively inserted into the bearing holes formed by the two concave portions 101 of the cylindrical case 10.
  • the plurality of needle rollers 40 are evenly arranged on the outer side of the pin shaft 50 along the circumferential direction of the pin shaft 50 and the outer ring 30 is fitted on the outer side of the plurality of needle rollers 40 so that the plurality of needle pins 40 are sandwiched between the outer ring 30 and the pin shaft. 50 and the outer ring 30 is rotatable relative to the pin 50.
  • the roller fuel pump tappet with the above structure can reciprocate under the action of the cam.
  • the cam of the camshaft periodically pushes the outer ring 30 from the axial one end side (upper side in FIG. 1b) of the cylindrical housing 10 toward the other axial end side (lower side in FIG. 1b) such that the outer ring 30
  • the ring 30 pushes the cylindrical housing 10 and the washer 20 toward the other axial end side under the action of the cam, and then the washer 20 pushes the plunger toward the other axial end side; when the cam is turned to the base circle position, the roll
  • the sub-type fuel pump tappet moves toward one end side in the axial direction under the action of the fuel pump spring force.
  • the outer ring 30 is also rotated relative to the pin shaft 50.
  • roller fuel pump tappet with the above structure can realize the functional requirements of converting the camshaft's rotary motion into the reciprocating motion of the plunger, part of the design and assembly process of the roller fuel pump tappet is complicated, and Heavy weight. This increases the cost of the roller fuel pump tappet and consumes excessive unnecessary energy during the reciprocating motion of the roller fuel pump tappet.
  • the present invention has been made based on the aforementioned shortcomings of the prior art.
  • the purpose of the present invention is to provide a new type of fuel pump tappet.
  • the fuel pump tappet has a simpler structure and a simpler assembly process while ensuring the functional requirements of converting the rotary motion of the camshaft into the reciprocating motion of the plunger. And less weight.
  • the present invention adopts the following technical solutions.
  • the present invention provides a fuel pump tappet comprising: a cylindrical casing; a cam contact portion, the cam contact portion having a plate shape as a whole and the cam contact portion being fixed to the An axial end of the cylindrical housing, the cam contact portion is formed with an arc-shaped cam contact surface protruding toward the axial one end side and used for contact with the cam; and a gasket, the gasket is mounted on the cylinder
  • the cam-shaped housing is adapted to abut a plunger, wherein the rotary motion of the cam can be converted into a reciprocating motion of the plunger via the cam contact portion, the cylindrical housing, and the spacer.
  • the shape of the cam contact surface is formed as a part of a side surface of a cylindrical shape.
  • the cam contact surface is coated with a coating for reducing frictional force in contact with the cam.
  • the cam contact portion is formed integrally with the cylindrical case.
  • the side wall of the cylindrical case is formed with at least two internal recesses that are recessed toward the inside, the at least two internal recesses are formed spaced apart in a circumferential direction of the cylindrical case, and the at least The other axial ends of the two inner recesses abut against the gasket to support the gasket.
  • the cam contact portion is a member independent of the cylindrical case, and the cam contact portion is riveted to an axial end of the cylindrical case, so that the cam contact portion is fixed to the cylindrical shape. case.
  • the side wall of the cylindrical case is formed with at least two internal recesses that are recessed toward the inside, the at least two internal recesses are formed spaced apart in a circumferential direction of the cylindrical case, and the at least One axial end of the two inner recessed portions abuts against the cam contact portion to support the cam contact portion, and the other axial end of the at least two inner recessed portions abut against the spacer to support the cam contact portion. Gasket.
  • the cam contact portion is formed by punching.
  • the gasket includes a gasket body and a first mounting portion and a second mounting portion extending from the gasket body, and a side wall of the cylindrical casing is formed to correspond to the first mounting portion.
  • the washer body has a shape protruding toward the other end side in the axial direction, and the washer body is configured to abut the plunger.
  • the present invention provides a novel fuel pump tappet.
  • the fuel pump tappet only includes a cylindrical casing, a plate-shaped cam contact portion provided at an axial end of the cylindrical casing, and an installation. Gasket inside the cylindrical case.
  • the fuel pump tappet according to the present invention can guarantee the realization of the functional requirements of converting the rotary motion of the camshaft into the reciprocating motion of the plunger; on the other hand, the fuel pump tappet according to the present invention uses a cam contact portion instead of the The structure of the outer ring, needle and pin of the roller fuel pump tap of the prior art, therefore, the structure of the fuel pump tappet according to the present invention is simpler, the assembly process is simpler, and the weight is smaller, thereby reducing fuel. Cost of pump tappets and energy savings.
  • FIG. 1a is a schematic perspective view showing a roller fuel pump tappet according to the prior art
  • FIG. 1b is a schematic view showing an internal structure of the roller fuel pump tappet in FIG. 1a
  • FIG. 1c is a view A schematic exploded perspective view of the roller fuel pump tappet in FIG. 1a is shown.
  • FIG. 2a is a schematic perspective view showing a fuel pump tappet according to a first embodiment of the present invention
  • FIG. 2b is another schematic perspective view showing a fuel pump tappet in FIG. 2a
  • FIG. 2c is a view showing 2a is a schematic perspective view of the internal structure of the fuel pump tappet in FIG. 2a
  • FIG. 2d is a schematic perspective view showing a part of the fuel pump tappet in FIG. 2a, which includes a cylindrical housing and a cam contact portion
  • FIG. 2e is A schematic diagram of the internal structure of this part of the fuel pump tappet in FIG. 2d is shown.
  • FIG. 3a is a schematic perspective view showing a fuel pump tappet according to a second embodiment of the present invention
  • FIG. 3b is a schematic view showing an internal structure of the fuel pump tappet in FIG. 3a
  • FIG. 3c is a view showing FIG. 3a is a schematic perspective view of a cylindrical casing of a fuel pump tappet
  • FIG. 3d is a schematic perspective view illustrating a cam contact portion of the fuel pump tappet in FIG. 3a.
  • axial”, “radial” and “circumferential” refer to the axial, radial, and circumferential directions of the cylindrical casing, respectively; “axial end side” Refers to the upper side in Figs. 2c and 3b, and “the other axial end side” refers to the lower side in Figs. 2c and 3b.
  • the valve lifter according to the first embodiment of the present invention includes a cylindrical housing 1, a washer 2, and a cam contact portion 3.
  • the structure and shape of the cylindrical casing 1 and the gasket 2 of the fuel pump tappet according to the first embodiment of the present invention and the cylindrical casing 1 and the gasket 2 of the roller fuel pump tappet according to the prior art The aspects are basically the same.
  • the cylindrical case 1 has a cylindrical shape and has a hollow portion on its inner side.
  • the side wall of the cylindrical case 1 is formed with two inner recessed portions 11 that are hollowed toward the inner side.
  • the two inner recessed portions 11 are formed spaced apart in the circumferential direction of the cylindrical case 1 and the two inner recessed portions 11 are separated therebetween.
  • the central axes of the cylindrical casings 1 are opposed to each other.
  • a substantially central portion of the side wall of the cylindrical case 1 in the axial direction A is formed with a through hole 12 and a locking portion 13 protruding from a hollow portion of the cylindrical case 1 toward the inside,
  • the through hole 12 and the engaging portion 13 are opposed to each other across the central axis of the cylindrical case 1, and the through hole 12, the engaging portion 13 and the two recessed portions 11 are staggered in the circumferential direction of the cylindrical case 1.
  • the gasket 2 is attached to a substantially central portion of the cylindrical case 1 in the axial direction A.
  • the gasket 2 includes a gasket body 21 and first and second mounting portions 22 and 23 protruding from both sides of the gasket body 21 in the radial direction R.
  • the first mounting portion 22 projects into the through hole 12 of the cylindrical case 1 and protrudes from the through hole 12, and the second mounting portion 23 is engaged with the engaging portion 13 of the cylindrical case 1.
  • the other axial ends of the two inner recessed portions 11 of the cylindrical case 1 abut against the gasket body 21 to support the gasket 2.
  • the first mounting portion 22 is matched with the through hole 12, the second mounting portion 23 is matched with the engaging portion 13, and the two recessed portions 11 are matched with the gasket body 21, so that the gasket 2 is mounted on the cylindrical housing 1 In the central part in the axial direction A.
  • the washer body 21 is also formed in a shape protruding toward the other end side in the axial direction, and the washer body 21 is for abutting the plunger protruding into the cylindrical housing 1 from the other end side in the axial direction.
  • the cam contact portion 3 has a plate shape as a whole, and the cam contact portion 3 is formed integrally with the cylindrical case 1 so that the cam contact portion 3 is fixed to an axial end of the cylindrical case 1 to extend from the cylindrical shape.
  • One end of the casing 1 in the axial direction covers the cylindrical casing 1.
  • the cam contact portion 3 is formed by punching.
  • the cam contact portion 3 is formed with an arc-shaped portion 31 protruding toward one end side in the axial direction, and an outer surface of the arc-shaped portion 31 serves as an arc-shaped cam contact surface 31s for contact with the cam.
  • the shape of the cam contact surface 31s is formed as a part of the side surface of a cylindrical shape.
  • the curvature radius of the arc shape in the cross section of the cam contact surface 31s taken along the axial direction A and the radial direction R can be set as required, for example, it can be calculated according to the Hertz stress on the fuel pump tappet. The radius of curvature of the cam contact surface 31s.
  • the cam contact surface 31s may be coated with a coating for reducing the friction force with which the cam contacts.
  • the arc-shaped portion 31 of the cam contact portion 3 is opposed to the washer body 21 of the washer 2, and the cam contact portion 3 can transmit a driving force from the cam to the cylindrical case 1.
  • the fuel pump tappet can reciprocate under the action of the cam.
  • the cam of the camshaft acts on the cam contact surface 31s periodically from one axial end side of the cylindrical casing 1 toward the other axial end side, thereby pushing the cam contact portion 3 such that the cam contact portion 3 acts on the cam
  • the washer 2 pushes the plunger toward the other axial end side; when the cam does not push the cam contact part 3 toward the other axial end side, The fuel pump tappet moves toward one end side in the axial direction under the action of the fuel pump spring force.
  • the basic structure of the fuel pump tappet according to the second embodiment of the present invention is substantially the same as the basic structure of the fuel pump tappet according to the first embodiment of the present invention.
  • the cam contact portion 3 is a separate component independent of the cylindrical case 1, and the cam contact portion 3 is riveted to one end of the cylindrical case 1 so that the cam contact portion 3 is fixed to the cylindrical case 1;
  • the axial ends of the two inner recessed portions 11 of the flaky housing 1 abut against the cam contact portion 3 to support the cam contact portion 3 and the other axial ends of the two inner recessed portions 11 abut against the washer body 21 to support the washer 2 .
  • the cam contact portion 3 includes an arc-shaped portion 31 as a main body and wings 32 protruding from the arc-shaped portion 31 to both sides.
  • the wing portion 32 is riveted to the riveted portion 14 of the cylindrical case 1, and the two inner recessed portions 11 support the arcuate portion 31 from the other axial side to support the cam contact portion 3, so that the cam contact portion 3 is fixed to the cylindrical case 1. 1 axial end.
  • the working process of the fuel pump tappet according to the second embodiment of the present invention is the same as the working process of the fuel pump tappet according to the first embodiment of the present invention, and will not be described in detail here.
  • the recessed portion 11 of the cylindrical housing 1 has a supporting effect on the cam contact portion 3 and the washer 2 in the axial direction A It also has a positioning function in the circumferential direction.
  • the present invention is not limited thereto, and the number of the recessed portions 11 may be set to be greater than two as required.
  • gasket 2 is attached to the cylindrical case 1 in the above specific embodiment, the present invention is not limited thereto, and the gasket 2 may be formed integrally with the cylindrical case 1.
  • the fuel pump tappet of the present invention is mainly used for a fuel pump of a direct injection engine, and the fuel pressure of the fuel pump is above 200 bar.

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

Abstract

一种燃油泵挺柱包括：筒状壳体（1）；凸轮接触部（3），其整体具有板形形状并且凸轮接触部（3）固定于筒状壳体（1）的轴向一端，凸轮接触部（3）形成有朝向轴向一端侧凸出且用于与凸轮接触的弧形的凸轮接触面（31s）；以及垫片（2），其安装于筒状壳体（1）的内部且用于抵接柱塞。该燃油泵挺柱能够保证实现将凸轮轴的旋转运动转换成柱塞的往复运动的功能要求；另外，该燃油泵挺柱采用凸轮接触部（3）代替了现有技术的滚子式燃油泵挺柱采用的外圈、滚针和销轴的结构，因此该燃油泵挺柱的结构更简单、组装过程更简单且重量更小，从而降低了燃油泵挺柱的成本并且节省了能量。

Description

燃油泵挺柱 技术领域
本发明涉及一种燃油泵挺柱。
背景技术
在发动机的燃料供给系统中，为了将凸轮轴的旋转运动转换成柱塞的往复运动，需要在凸轮轴和柱塞之间设置燃油泵挺柱来实现这种转换。
作为燃油泵挺柱的示例，如图1a至图1c所示，存在一种如下的滚子式燃油泵挺柱。该滚子式燃油泵挺柱包括筒状壳体10、垫片20、外圈30、多个滚针40和销轴50。
具体地，筒状壳体10具有中空的圆筒形状，该筒状壳体10的内侧的中空部在筒状壳体10的轴向A上是贯通的。
筒状壳体10的侧壁形成有两个朝向内侧的中空部凹陷的内凹部101，这两个内凹部101隔着筒状壳体10的中心轴线彼此相对。
另外，筒状壳体10的侧壁的在轴向A上的大致中央部位形成有一个通孔102和从筒状壳体10的内周面朝向内侧的中空部凸出的卡接部103，该通孔102与卡接部103隔着筒状壳体10的中心轴线彼此相对，并且通孔102、卡接部103和两个内凹部101在筒状壳体10的周向上错开布置。
进一步地，垫片20安装于筒状壳体10在轴向A上的大致中央部位。该垫片20包括垫片主体201以及从垫片主体201的在径向R上的两侧凸出的第一安装部202和第二安装部203。
第一安装部202伸入筒状壳体10的通孔102并从该通孔102伸出，第二安装部203卡接于筒状壳体10的卡接部103。另外，筒状壳体10的两个内凹部101的轴向另一端(图1a和图1b中的下端)能够抵接于垫片主体201以支撑垫片 20。通过第一安装部202与通孔102相配合、第二安装部203与卡接部103相配合以及两个内凹部101与垫片主体201相配合，使得垫片20安装于筒状壳体10的在轴向A上的大致中央部位。
另外，垫片主体201形成为朝向轴向另一端侧凸出的形状，垫片主体201用于抵接从轴向另一端侧伸入筒状壳体10的柱塞。
进一步地，销轴50安装于筒状壳体10，销轴50的两端部分别插入筒状壳体10的两个内凹部101形成的轴承孔内。多个滚针40沿着销轴50的周向均匀地布置在销轴50的外侧并且在多个滚针40的外侧套装外圈30，使得多个滚针40被夹在外圈30与销轴50之间并且外圈30能够相对于销轴50旋转。
这样，当发动机的燃料供给系统正常工作时，具有上述结构的滚子式燃油泵挺柱能够在凸轮的作用下进行往复运动。具体地，凸轮轴的凸轮从筒状壳体10的轴向一端侧(图1b中的上侧)周期性地朝向轴向另一端侧(图1b中的下侧)推动外圈30，使得外圈30在凸轮的作用下推动筒状壳体10和垫片20朝向轴向另一端侧运动，进而垫片20推动柱塞朝向轴向另一端侧运动；当凸轮转到基圆位置时，滚子式燃油泵挺柱在燃油泵弹簧力的作用下朝向轴向一端侧运动。在上述往复过程中，外圈30还相对于销轴50进行旋转。
虽然具有上述结构的滚子式燃油泵挺柱能够实现将凸轮轴的旋转运动转换成柱塞的往复运动的功能要求，但是该滚子式燃油泵挺柱的部分设计及部分组装过程复杂，而且重量较大。这增加了滚子式燃油泵挺柱的成本并且在滚子式燃油泵挺柱的往复运动过程中会消耗过多的不必要的能量。
发明内容
基于上述现有技术的缺陷而做出了本发明。本发明的目的在于提供一种新型的燃油泵挺柱，该燃油泵挺柱在保证能够实现将凸轮轴的旋转运动转换成柱塞的往复运动的功能要求的同时结构更简单、组装过程更简单且重量更 小。
为了实现上述发明目的，本发明采用如下的技术方案。
本发明提供了一种如下的燃油泵挺柱，所述燃油泵挺柱包括：筒状壳体；凸轮接触部，所述凸轮接触部整体具有板形形状并且所述凸轮接触部固定于所述筒状壳体的轴向一端，所述凸轮接触部形成有朝向轴向一端侧凸出且用于与凸轮接触的弧形的凸轮接触面；以及垫片，所述垫片安装于所述筒状壳体的内部且用于抵接柱塞，其中所述凸轮的旋转运动能够经由所述凸轮接触部、所述筒状壳体和所述垫片转换成所述柱塞的往复运动。
优选地，所述凸轮接触面的形状被形成为圆柱形状的侧面的一部分。
优选地，所述凸轮接触面涂覆有用于减小与所述凸轮接触的摩擦力的涂层。
优选地，所述凸轮接触部与所述筒状壳体形成为一体。
更优选地，所述筒状壳体的侧壁形成有朝向内侧凹陷的至少两个内凹部，所述至少两个内凹部在所述筒状壳体的周向上间隔开的形成，所述至少两个内凹部的轴向另一端均抵接所述垫片以支撑所述垫片。
优选地，所述凸轮接触部是独立于所述筒状壳体的部件，所述凸轮接触部铆接于所述筒状壳体的轴向一端，使得所述凸轮接触部固定于所述筒状壳体。
更优选地，所述筒状壳体的侧壁形成有朝向内侧凹陷的至少两个内凹部，所述至少两个内凹部在所述筒状壳体的周向上间隔开的形成，所述至少两个内凹部的轴向一端均抵接于所述凸轮接触部以支撑所述凸轮接触部，并且所述至少两个内凹部的轴向另一端均抵接于所述垫片以支撑所述垫片。
优选地，通过冲压形成所述凸轮接触部。
优选地，所述垫片包括垫片主体和从所述垫片主体伸出的第一安装部和第二安装部，所述筒状壳体的侧壁形成有与所述第一安装部对应的通孔和与 所述第二安装部对应的卡接部，并且通过使所述第一安装部伸入所述通孔且所述第二安装部卡接于所述卡接部，将所述垫片安装于所述筒状壳体。
更优选地，所述垫片主体具有朝向轴向另一端侧凸出的形状，并且所述垫片主体用于抵接所述柱塞。
通过采用上述技术方案，本发明提供了一种新型的燃油泵挺柱，该燃油泵挺柱仅包括筒状壳体、设置于筒状壳体的轴向一端的板状的凸轮接触部和安装于筒状壳体的内部的垫片。一方面，根据本发明的燃油泵挺柱能够保证实现将凸轮轴的旋转运动转换成柱塞的往复运动的功能要求；另一方面，根据本发明的燃油泵挺柱采用凸轮接触部代替了现有技术的滚子式燃油泵挺柱采用的外圈、滚针和销轴的结构，因此根据本发明的燃油泵挺柱的结构更简单、组装过程更简单且重量更小，从而降低了燃油泵挺柱的成本并且节省了能量。
附图说明
图1a是示出了根据现有技术的滚子式燃油泵挺柱的示意性立体图；图1b是示出了图1a中的滚子式燃油泵挺柱的内部结构的示意图；图1c是示出了图1a中的滚子式燃油泵挺柱的示意性分解立体图。
图2a是示出了根据本发明的第一实施方式的燃油泵挺柱的示意性立体图；图2b是示出了图2a中的燃油泵挺柱的另一示意性立体图；图2c是示出了图2a中的燃油泵挺柱的内部结构的示意图；图2d是示出了图2a中的燃油泵挺柱的一部分的示意性立体图，其中包括筒状壳体和凸轮接触部；图2e是示出了图2d中的燃油泵挺柱的该部分的内部结构的示意图。
图3a是示出了根据本发明的第二实施方式的燃油泵挺柱的示意性立体图；图3b是示出了图3a中的燃油泵挺柱的内部结构的示意图；图3c是示出了图3a中的燃油泵挺柱的筒状壳体的示意性立体图；图3d是示出了图3a中的燃 油泵挺柱的凸轮接触部的示意性立体图。
附图标记说明
10筒状壳体 101内凹部 102通孔 103卡接部 20垫片 201垫片主体 202第一安装部 203第二安装部 30外圈 40滚针 50销轴
1筒状壳体 11内凹部 12通孔 13卡接部 14铆接部 2垫片 21垫片主体 22第一安装部 23第二安装部 3凸轮接触部 31弧形部 31s凸轮接触面 32翼部
A轴向 R径向
具体实施方式
以下将结合说明书附图详细说明本发明的具体实施方式。在以下的具体实施方式中，如无特殊说明，“轴向”、“径向”和“周向”分别是指筒状壳体的轴向、径向和周向；“轴向一端侧”是指图2c和图3b中的上侧，“轴向另一端侧”是指图2c和图3b中的下侧。
(第一实施方式)
如图2a至图2e所述，根据本发明的第一实施方式的气门顶杆包括筒状壳体1、垫片2和凸轮接触部3。根据本发明的第一实施方式的燃油泵挺柱的筒状壳体1和垫片2与根据现有技术的滚子式燃油泵挺柱的筒状壳体1和垫片2在结构和形状方面基本相同。
具体地，在本实施方式中，筒状壳体1具有圆筒形状，其内侧具有中空部。
筒状壳体1的侧壁形成有两个朝向内侧的中空部凹陷的内凹部11，两个内凹部11在筒状壳体1的周向上间隔开的形成并且这两个内凹部11隔着筒状壳体1的中心轴线彼此相对。
另外，筒状壳体1的侧壁的在轴向A上的大致中央部位形成有一个通孔12和从筒状壳体1的内周面朝向内侧的中空部凸出的卡接部13，该通孔12与卡接部13隔着筒状壳体1的中心轴线彼此相对，并且通孔12、卡接部13和两个内凹部11在筒状壳体1的周向上错开布置。
在本实施方式中，垫片2安装于筒状壳体1的在轴向A上的大致中央部位。该垫片2包括垫片主体21以及从垫片主体21的在径向R上的两侧凸出的第一安装部22和第二安装部23。
第一安装部22伸入筒状壳体1的通孔12并且从该通孔12伸出，第二安装部23卡接于筒状壳体1的卡接部13。另外，筒状壳体1的两个内凹部11的轴向另一端抵接于垫片主体21，以支撑垫片2。通过第一安装部22与通孔12相配合、第二安装部23与卡接部13相配合以及两个内凹部11与垫片主体21相配合，使得垫片2安装于筒状壳体1的在轴向A上的大致中央部位。
另外，垫片主体21还形成为朝向轴向另一端侧凸出的形状，该垫片主体21用于抵接从轴向另一端侧伸入筒状壳体1的柱塞。
在本实施方式中，凸轮接触部3整体具有板形形状，凸轮接触部3与筒状壳体1形成为一体，使得凸轮接触部3固定于筒状壳体1的轴向一端以从筒状壳体1的轴向一端侧盖住筒状壳体1。在本实施方式中，通过冲压形成凸轮接触部3。
凸轮接触部3形成有朝向轴向一端侧凸出的弧形部31，该弧形部31的外表面作为用于与凸轮接触的弧形的凸轮接触面31s。在本实施方式中，凸轮接触面31s的形状被形成为圆柱形状的侧面的一部分。进一步地，该凸轮接触面31s的沿着轴向A和径向R截取的截面中的弧形形状的曲率半径可以根据需要进行设定，例如可以根据燃油泵挺柱所受到的赫兹应力来计算该凸轮接触面31s的曲率半径。另外，为了减小该凸轮接触面31s与凸轮接触时的摩擦力，凸轮接触面31s可以涂覆有用于减小与凸轮接触的摩擦力的涂层。在 本实施方式中，凸轮接触部3的弧形部31与垫片2的垫片主体21相对，凸轮接触部3能够将来自凸轮的驱动力传递到筒状壳体1。
当采用具有上述结构的燃油泵挺柱的发动机的燃料供给系统正常工作时，该燃油泵挺柱能够在凸轮的作用下进行往复运动。具体地，凸轮轴的凸轮从筒状壳体1的轴向一端侧周期性地朝向轴向另一端侧作用于凸轮接触面31s，从而推动凸轮接触部3，使得凸轮接触部3在凸轮的作用下推动筒状壳体1和垫片2朝向轴向另一端侧运动，进而垫片2推动柱塞朝向轴向另一端侧运动；当凸轮不朝向轴向另一端侧推动凸轮接触部3时，燃油泵挺柱在燃油泵弹簧力的作用下朝向轴向一端侧运动。
(第二实施方式)
如图3a至图3d所示，根据本发明的第二实施方式的燃油泵挺柱的基本结构与根据本发明的第一实施方式的燃油泵挺柱的基本结构大致相同，两者之间的不同之处在于：凸轮接触部3是独立于筒状壳体1的单独的部件，凸轮接触部3铆接于筒状壳体1的一端，使得凸轮接触部3固定于筒状壳体1；筒状壳体1的两个内凹部11的轴向一端均抵接凸轮接触部3以支撑凸轮接触部3并且两个内凹部11的轴向另一端均抵接垫片主体21以支撑垫片2。
具体地，主要如图3d所示，该凸轮接触部3包括作为主体的弧形部31和从弧形部31朝向两侧伸出的翼部32。翼部32铆接于筒状壳体1的铆接部14，两个内凹部11从轴向另一端侧支撑弧形部31以支撑凸轮接触部3，从而使得凸轮接触部3固定于筒状壳体1的轴向一端。
根据本发明的第二实施方式的燃油泵挺柱的工作过程与根据本发明的第一实施方式的燃油泵挺柱的工作过程相同，在这里就不进行具体说明了。
虽然在以上的具体实施方式中详细地阐述了本发明的具体实施方式，但是还需要说明的是：
1.虽然在以上的具体实施方式中没有明确说明，但是本领域技术人员应 当理解筒状壳体1的内凹部11对凸轮接触部3和垫片2除了具有在轴向A上的支撑作用以外还具有在周向上的定位作用。
2.虽然在以上的具体实施方式中说明了内凹部11的数量为两个，但是本发明不限于此，内凹部11的数量可以根据需要设定为大于两个。
3.虽然在以上的具体实施方式中说明了垫片2安装于筒状壳体1，但是本发明不限于此，垫片2也可以与筒状壳体1形成为一体。
4.需要说明的是，本发明的燃油泵挺柱主要用于直喷发动机的燃油泵，该燃油泵的油压在200巴(bar)以上。

Claims (10)

  1. 一种燃油泵挺柱，所述燃油泵挺柱包括：
    筒状壳体；
    凸轮接触部，所述凸轮接触部整体具有板形形状并且所述凸轮接触部设置于所述筒状壳体的轴向一端，所述凸轮接触部形成有朝向轴向一端侧凸出且用于与凸轮接触的弧形的凸轮接触面；以及
    垫片，所述垫片安装于所述筒状壳体的内部且用于抵接柱塞，
    其中所述凸轮的旋转运动能够经由所述凸轮接触部、所述筒状壳体和所述垫片转换成所述柱塞的往复运动。
  2. 根据权利要求1所述的燃油泵挺柱，其特征在于，所述凸轮接触面的形状被形成为圆柱形状的侧面的一部分。
  3. 根据权利要求1或2所述的燃油泵挺柱，其特征在于，所述凸轮接触面涂覆有用于减小摩擦力的涂层。
  4. 根据权利要求1至3中任一项所述的燃油泵挺柱，其特征在于，所述凸轮接触部与所述筒状壳体形成为一体。
  5. 根据权利要求4所述的燃油泵挺柱，其特征在于，所述筒状壳体的侧壁形成有朝向内侧凹陷的至少两个内凹部，所述至少两个内凹部在所述筒状壳体的周向上间隔开的形成，所述至少两个内凹部的轴向一端均抵接所述垫片以支撑所述垫片。
  6. 根据权利要求1至3中任一项所述的燃油泵挺柱，其特征在于，所述凸轮接触部是独立于所述筒状壳体的部件，所述凸轮接触部铆接于所述筒状壳体的轴向一端，使得所述凸轮接触部固定于所述筒状壳体。
  7. 根据权利要求6所述的燃油泵挺柱，其特征在于，所述筒状壳体的侧壁形成有朝向内侧凹陷的至少两个内凹部，所述至少两个内凹部在所述筒状壳体的周向上间隔开的形成，所述至少两个内凹部的轴向一端均抵接于所述凸轮接触部以支撑所述凸轮接触部，并且所述至少两个内凹部的轴向一端均 抵接于所述垫片以支撑所述垫片。
  8. 根据权利要求1至7中任一项所述的燃油泵挺柱，其特征在于，通过冲压形成所述凸轮接触部。
  9. 根据权利要求1至8中任一项所述的燃油泵挺柱，其特征在于，所述垫片包括垫片主体和从所述垫片主体伸出的第一安装部和第二安装部，
    所述筒状壳体的侧壁形成有与所述第一安装部对应的通孔和与所述第二安装部对应的卡接部，并且
    通过使所述第一安装部伸入所述通孔且所述第二安装部卡接于所述卡接部，将所述垫片安装于所述筒状壳体。
  10. 根据权利要求9所述的燃油泵挺柱，其特征在于，所述垫片主体具有朝向轴向另一端侧凸出的形状，并且所述垫片主体用于抵接所述柱塞。
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