WO2021196140A1 - 用于挺柱的壳体和挺柱 - Google Patents

用于挺柱的壳体和挺柱 Download PDF

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Publication number
WO2021196140A1
WO2021196140A1 PCT/CN2020/083054 CN2020083054W WO2021196140A1 WO 2021196140 A1 WO2021196140 A1 WO 2021196140A1 CN 2020083054 W CN2020083054 W CN 2020083054W WO 2021196140 A1 WO2021196140 A1 WO 2021196140A1
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WO
WIPO (PCT)
Prior art keywords
section
housing
tappet
radially outer
component
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PCT/CN2020/083054
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English (en)
French (fr)
Inventor
沈宇辉
刘正东
高辉
Original Assignee
舍弗勒技术股份两合公司
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Application filed by 舍弗勒技术股份两合公司 filed Critical 舍弗勒技术股份两合公司
Priority to PCT/CN2020/083054 priority Critical patent/WO2021196140A1/zh
Publication of WO2021196140A1 publication Critical patent/WO2021196140A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • 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 the field of fuel supply. More specifically, the present invention relates to a tappet for a fuel supply system and a casing for the tappet.
  • a high-pressure fuel pump is used to inject fuel into the cylinder.
  • the tappet is arranged between the plunger of the high-pressure fuel pump and the cam of the camshaft, and the axial end of the tappet is inserted into the mounting hole of the cylinder head.
  • FIGS. 1 to 3 show the structure of a tappet.
  • the tappet includes a housing 110, a pin 120, a roller 130 and a rolling body 140.
  • the housing 110 is substantially cylindrical.
  • the housing 110 has two opposed flat portions on the upper half (driving side). Both ends of the pin 120 are inserted into the hole of the flat part, and the pin 120 is fixed to the flat part.
  • the pin 120 supports the roller 130 in a rotatable manner through the rolling element 140, so that the roller 130 is rotatably disposed on the housing 110.
  • the circumferential surface of the roller 130 is used to contact the cam (not shown) of the camshaft.
  • the tappet further includes an anti-twist unit 150.
  • the anti-twist unit 150 includes a protruding part 151 and an insertion part 152.
  • An opening is provided on the side wall of the housing 110, and the anti-twist unit 150 is partially inserted into the opening through the insertion portion 152.
  • the protrusion 151 has a circular arc outer surface.
  • the tappet is used to install into the mounting hole of the cylinder head.
  • a sliding groove is provided on the inner wall of the mounting hole of the cylinder head.
  • the protrusion 151 of the anti-twist unit 150 can be embedded in the sliding groove. When the tappet reciprocates in the mounting hole of the cylinder head, the protrusion 151 also reciprocates in the sliding groove, thereby preventing the tappet from rotating about its axis.
  • the tappet further includes a bridge that is disposed in the housing and transversely penetrates the side wall of the housing, and the radial extension of the bridge serves as an anti-twist unit extending from the opening in the side wall of the housing. out.
  • the housing is arranged in the mounting hole with a contact fit, and the tolerance range is very small (for example, only 0.008 ⁇ m). Therefore, the manufacturing precision requirements of this anti-twist unit are very strict, which also causes its manufacturing cost to be very high.
  • the separate anti-twist unit needs to be assembled on the shell through an additional process, which also results in a longer manufacturing time and a further increase in the cost of the tappet.
  • An object of the present invention is to provide a housing and tappet with a simple structure. Another object of the present invention is to provide a housing and a tappet with a reduced manufacturing cost.
  • One aspect of the present invention provides a housing for a tappet, which includes a first section on the driving side and a second section on the driven side along the axial direction of the housing, wherein the first section of the housing
  • the outer diameter of the section is smaller than the outer diameter of the second section, the first section and the second section are integrally formed, and the housing also includes an anti-twisting component, wherein the anti-twisting component is from the first section to the radial direction
  • the outer side is curved and protrudes and exceeds the radial outer surface of the second section when viewed in the axial direction.
  • the anti-twist component and the first section are continuous without being separated.
  • the housing includes two arc-shaped parts disposed oppositely, and the anti-twisting component is formed on one of the two arc-shaped parts of the first section.
  • the upper end surface of the anti-twist component is flush with the upper end surface of the arc-shaped portion of the first section.
  • the wall thickness of the anti-twisting component is smaller than the wall thickness of the arc-shaped portion of the first section.
  • the radially outer surface of the anti-twist component is at least partially in the shape of an arc protruding outward.
  • the anti-twist component is located above the second section as a whole when viewed from the side.
  • the radially outer surface of the second section is a ground surface, so that the radially outer surface of the second section has a higher accuracy than the radially outer surface of the first section.
  • a tappet including: a housing according to an embodiment of the present invention; a pin fixed in a hole in a first section of the housing; and a roller having a cylindrical shape and passing through The pin is rotatably arranged in the first section of the housing.
  • the tappet further includes a plurality of rolling bodies, which are arranged between the pin and the roller.
  • Another aspect of the present invention provides a manufacturing method of a casing for a tappet, including: forming a casing, the casing includes a first section and a second section distributed in an axial direction, and an outer portion of the first section The diameter is smaller than the outer diameter of the second section; an anti-twisting part is formed in the first section of the housing, wherein the anti-twisting part is bent and protruded from the first section to the radially outer side and exceeds the second part when viewed in the axial direction The radially outer surface of the section; and grinding the radially outer surface of the second section.
  • Figure 1 is a perspective view of a roller tappet.
  • Fig. 2 is a cross-sectional view of the roller tappet shown in Fig. 1.
  • Fig. 3 is an exploded view of the roller tappet shown in Fig. 1.
  • Fig. 4 is a perspective view of a roller tappet according to an embodiment of the present invention.
  • Fig. 5 is a perspective view of a housing for a tappet according to an embodiment of the present invention.
  • Fig. 6 is a top view of a housing for a tappet according to an embodiment of the present invention.
  • Fig. 7 is a side view of a housing for a tappet according to an embodiment of the present invention.
  • Fig. 4 is a perspective view of a roller tappet according to an embodiment of the present invention.
  • Fig. 5 is a perspective view of a housing for a tappet according to an embodiment of the present invention.
  • Fig. 6 is a top view of a housing for a tappet according to an embodiment of the present invention.
  • Fig. 7 is a side view of a housing for a tappet according to an embodiment of the present invention.
  • the tappet includes a housing 10, a pin 20, a roller 30, and a rolling body (not shown).
  • the tappet according to the present invention can be applied to a fuel supply system, and is arranged between the cam of the camshaft and the plunger of the high-pressure fuel pump.
  • the tappet can be arranged in the mounting hole of the fuel supply system, such as the cylinder head, for reciprocating motion, and drives the plunger connected to it to reciprocate.
  • the housing 10 has a substantially hollow cylindrical shape.
  • the tappet can slide up and down in, for example, a mounting hole of a cylinder head via the radially outer surface of the housing 10.
  • the housing 10 includes a first section 11 located on the driving side (upper side) in the axial direction and a second section 12 located on the driven side (lower side).
  • the driving side refers to the side where the tappet contacts the cam
  • the driven side refers to the side where the tappet and the plunger are connected.
  • the outer diameter of the first section 11 is smaller than the outer diameter of the second section 12. Therefore, the housing 10 has a substantially stepped cylindrical shape.
  • the first section 11 and the second section 12 are integrally formed. In some embodiments, the wall thickness of the first section 11 is smaller than the wall thickness of the second section 12.
  • the pin 20 may be fixed in the first section 11 of the housing 10.
  • the housing 10 is provided with a hole 13 in the first section 11.
  • the first section 11 includes two oppositely arranged flat portions 111 and two oppositely arranged arc-shaped portions 112.
  • the two flat portions 111 and the two arc-shaped portions 112 are alternately arranged.
  • the holes 13 are respectively provided on the flat portion 111.
  • the pin 20 may be inserted into the hole 13 through both ends thereof, and fixed to the housing 10 by means of riveting or the like, for example.
  • the flat portion 111 is recessed inward from the radially outer surface of the housing 10.
  • the roller 30 has a cylindrical shape and can be rotatably sleeved on the pin 20.
  • the roller 30 may be rotatably provided in the first section 11 of the housing 10.
  • the roller 30 is used to contact the cam of the camshaft.
  • the tappet may further include a plurality of rolling bodies, such as needle rollers, arranged between the inner surface of the roller 30 and the outer surface of the pin 20. Therefore, the pin 20 rotatably supports the roller 30 through the rolling body, so that the roller 30 is rotatably provided on the housing 10.
  • the housing 10 further includes an anti-twist component 14.
  • the anti-twist member 14 is curved and protruded from the first section 11 to the radially outer side. According to the embodiment of the present invention, viewed in the axial direction, the anti-twist component 14 extends beyond the radially outer surface of the second section 12. Therefore, the anti-twist member 14 is a member that integrally protrudes from the first section 11 of the housing 10. Specifically, the anti-twist component 14 may be formed from the first section 11 of the housing 10 by stamping.
  • the anti-twist member 14 When the tappet is installed in, for example, the installation hole of the cylinder head, the anti-twist member 14 is embedded in the sliding groove provided on the inner wall of the installation hole of the cylinder head.
  • the housing 10 since the outer diameter of the first section 11 is smaller than the outer diameter of the second section 12, the housing 10 slides up and down in the mounting hole through the radially outer surface of the second section 12, and the The radial outer surface of the section 11 does not contact the inner surface of the mounting hole.
  • the anti-twist member 14 is embedded in the sliding groove provided on the inner surface of the mounting hole, and slides up and down in the sliding groove as the housing 10 slides up and down in the mounting hole.
  • the anti-twist component 14 and the first section 11 are continuous without being separated. This indicates that the anti-twist component 14 and the first section 11 are not separated or broken apart. In this case, the integrity of the anti-torsion component 14 and the first section 11 is not damaged, so that subsequent processing techniques for the housing 10 can be reduced, the manufacturing cost of the housing 10 can be reduced, and the service life of the housing 10 can be improved. .
  • the anti-twist component 14 is formed on an arc 112 of the first section 11.
  • the anti-twisting component 14 is arranged at a position close to the upper end of the first section 11.
  • the upper end surface of the anti-twist component 14 is flush with the upper end surface of the arc 112 of the first section 11.
  • a punch used for punching can easily extend into the interior of the first section 11 and realize the forming of the anti-twist component 14, which can reduce the manufacturing difficulty and cost of the housing 10.
  • the wall thickness of the first section 11 is smaller than the wall thickness of the second section 12 before the anti-torsion component 14 is formed, so the deformation force required by the stamping process of the anti-torsion component 14 can be reduced. This is conducive to the processing and shaping of the anti-torsion component 14 and also contributes to the weight reduction of the housing 10.
  • the radially outer surface of the anti-twist component 14 is at least partially in the shape of an arc protruding outward. This indicates that at least a part of the radial outer contour of the anti-twist member 14 is formed in an arc shape when viewed in the axial direction.
  • the radially outer surface of the anti-twisting member 14 is used to at least partially interact with The inner surfaces of the sliding groove are engaged.
  • the sliding groove usually has an arc-shaped inner surface.
  • the tappet including the anti-twist component 14 according to the embodiment of the present invention can be directly installed on, for example, an existing cylinder head, without the need for the cylinder head.
  • the structure of the cover etc. was transformed. Therefore, the housing and the tappet according to the embodiment of the present invention may have wider applicability.
  • the radial outer contour of the anti-twist component 14 is generally arc-shaped. This indicates that when viewed in the axial direction, the radial outer contour of the anti-twist component 14 is formed as a circular arc with a uniform radius of curvature.
  • the two corners of the radially outer surface of the anti-twist component 14 are respectively arc-shaped. The corners of the radially outer surface of the anti-twist member 14 indicate that the anti-twist member 14 is located at both ends in the circumferential direction of the housing 10 in a plan view.
  • the middle portion of the radially outer surface of the anti-twist component 14 between the two corners may be arc-shaped or straight.
  • the radius of curvature of the middle portion may be different from the radius of curvature of the corners.
  • the radius of curvature of the middle portion may be greater than the radius of curvature of the corner portions.
  • the radially outer surface of the anti-twist component 14 is at least partially in the shape of an arc protruding outward.
  • the present invention is not limited to this.
  • the anti-twisting member 14 may have any shape to fit with the sliding groove.
  • the radially outer surface of the second section 12 is a ground surface, and the radially outer surface of the first section 11 is an unground surface. Therefore, the radially outer surface of the second section 12 may have a higher accuracy than the radially outer surface of the first section 11. In the manufacturing process of the existing casing, the radial outer surface of the casing needs to be ground as a whole to meet the requirements of dimensional accuracy and fitting accuracy. According to the embodiment of the present invention, since the housing 10 slides up and down in the mounting hole through the radially outer surface of the second section 12 while the radially outer surface of the first section 11 does not contact the inner surface of the mounting hole, the first section 11 does not contact the inner surface of the mounting hole. The radial outer surface of the section 11 may not be subjected to grinding processing. As a result, the processing accuracy requirements of the housing can be reduced, and the manufacturing difficulty and manufacturing cost of the housing can be reduced at the same time.
  • a housing 10 having a first section 11 and a second section 12 is formed (for example by forging), the outer diameter of the first section 11 is smaller than the outer diameter of the second section 12.
  • an anti-twist component 14 is formed (for example, by stamping) in the first section 11 of the housing 10, wherein the anti-twist component 14 is bent and protruded from the first section 11 to the radially outer side and exceeds the first section 11 in the axial direction.
  • the radial outer surface of the second section 12 is ground to meet the accuracy requirements of the housing 10.
  • the grinding tool may be performed on the shell 10 to improve the mechanical properties of the shell 10.
  • the grinding tool can avoid the anti-twist component 14 to grind the second section 12 during the grinding process, so that the grinding process will not be affected.
  • the anti-twisting member 14 is located entirely above the second section when viewed from the side. As a result, it can be ensured that the anti-twist component 14 and the second section 12 do not overlap each other in the axial direction, thereby ensuring that the anti-twist component 14 will not adversely affect the grinding processing and sliding operation of the second section 12 , At the same time, it can reduce the difficulty of grinding and finishing.

Abstract

一种用于挺柱的壳体（10），包括沿壳体（10）的轴向位于驱动侧的第一部段（11）和位于从动侧的第二部段（12），其中，壳体（10）的第一部段（11）的外径小于第二部段（12）的外径，第一部段（11）和第二部段（12）是一体形成的，并且壳体（10）还包括抗扭转部件（14），其中，抗扭转部件（14）是从第一部段（11）向径向外侧弯曲突出的并且沿轴向观察超过第二部段（12）的径向外表面。

Description

用于挺柱的壳体和挺柱 技术领域
本发明涉及燃料供应领域。更具体地，本发明涉及用于燃料供应系统的挺柱和用于挺柱的壳体。
背景技术
在一种内燃机的燃料供应系统中，采用高压燃料泵将燃料喷射到汽缸中。挺柱设置在高压燃料泵的柱塞和凸轮轴的凸轮之间，挺柱的轴向一端插入汽缸盖的安装孔内。在内燃机启动时，凸轮轴转动，凸轮驱动挺柱在汽缸盖的安装孔内做往复运动，同时带动柱塞做往复运动。
图1至图3示出一种挺柱的结构。如图1至图3所示，挺柱包括壳体110、销柱120、滚子130和滚动体140。壳体110大致呈圆筒状。壳体110在上半部(驱动侧)具有两个相对设置的平坦部。销柱120的两端被插入到平坦部的孔中，并且销柱120被固定到平坦部。销柱120通过滚动体140以能够旋转的方式支承滚子130，从而滚子130可转动地设置在壳体110上。滚子130的圆周表面用于与凸轮轴的凸轮(未示出)接触。为保证滚子130与凸轮之间始终保持线接触，挺柱还包括防扭转单元150。防扭转单元150包括突出部151和插入部152。在壳体110的侧壁上设置开口，防扭转单元150通过插入部152部分地插入到开口中。突出部151具有圆弧外表面。挺柱用于安装到汽缸盖的安装孔中。在汽缸盖的安装孔的内壁上设置有滑动槽。防扭转单元150的突出部151能够嵌入到滑动槽中。当挺柱在汽缸盖的安装孔内做往复运动时，突出部151也在滑动槽中做往复运动，由此防止挺柱绕其轴线发生转动。
在另一中结构中，挺柱还包括设置在壳体内并且横向贯穿壳体的侧壁的桥形件，桥形件的径向延长部作为防扭转单元从位于壳体侧壁中的开口伸出。
壳体以接触配合设置在安装孔中，并且公差范围非常小(例如仅为0.008μm)。因此，这种防扭转单元的制造精度要求非常严格，也造成其制造成本非常高。单独设置的防扭转单元需要通过额外的工艺组装到壳体上，这也造成挺柱的制造时间延长和成本进一步提高。
为此，需要一种结构更简单的挺柱。
发明内容
本发明的一个目的是提供结构简单的壳体和挺柱。本发明的另一目的是提供制造成本降低的壳体和挺柱。
本发明的一个方面提供一种用于挺柱的壳体，包括沿壳体的轴向位于驱动侧的第一部段和位于从动侧的第二部段，其中，壳体的第一部段的外径小于第二部段的外径，第一部段和第二部段是一体形成的，并且壳体还包括抗扭转部件，其中，抗扭转部件是从第一部段向径向外侧弯曲突出的并且沿轴向观察超过第二部段的径向外表面。
根据本发明的实施例，抗扭转部件与第一部段是连续而未分离的。
根据本发明的实施例，壳体包括相对设置的两个弧形部，抗扭转部件形成于第一部段的两个弧形部中的一者上。
根据本发明的实施例，抗扭转部件的上端面与第一部段的弧形部的上端面平齐。
根据本发明的实施例，抗扭转部件的壁厚小于第一部段的弧形部的壁厚。
根据本发明的实施例，抗扭转部件的径向外表面至少部分地呈向外突出的圆弧状。
根据本发明的实施例，抗扭转部件从侧面观察整体位于第二部段上方。
根据本发明的实施例，第二部段的径向外表面是经过磨削的表面，使得第二部段的径向外表面具有比第一部段的径向外表面更高的精度。
本发明的另一方面提供一种挺柱，包括：根据本发明的实施例的壳体；销柱，固定在壳体的第一部段的孔中；和滚子，具有圆筒形状并且通 过销柱可转动地设置在壳体的第一部段中。
根据本发明的实施例，挺柱还包括多个滚动体，设置在销柱和滚子之间。
本发明的另一方面提供一种用于挺柱的壳体的制造方法，包括：形成壳体，壳体包括沿轴向分布的第一部段和第二部段，第一部段的外径小于第二部段的外径；在壳体的第一部段中形成抗扭转部件，其中抗扭转部件是从第一部段向径向外侧弯曲突出的并且沿轴向观察超过第二部段的径向外表面；以及对第二部段的径向外表面进行磨削。
附图说明
图1是一种滚子挺柱的透视图。
图2是图1所示的滚子挺柱的截面图。
图3是图1所示的滚子挺柱的分解图。
图4是根据本发明的实施例的滚子挺柱的透视图。
图5是根据本发明的实施例的用于挺柱的壳体的透视图。
图6是根据本发明的实施例的用于挺柱的壳体的俯视图。
图7是根据本发明的实施例的用于挺柱的壳体的侧视图。
具体实施方式
下文中，参照附图描述本发明的实施例。下面的详细描述和附图用于示例性地说明本发明的原理，本发明不限于所描述的优选实施例，本发明的范围由权利要求书限定。现参考示例性的实施方式详细描述本发明，一些实施例图示在附图中。以下描述参考附图进行，除非另有表示，否则在不同附图中的相同附图标记代表相同或类似的元件。以下示例性实施方式中描述的方案不代表本发明的所有方案。相反，这些方案仅是所附权利要求中涉及的本发明的各个方面的系统和方法的示例。
图4是根据本发明的实施例的滚子挺柱的透视图。图5是根据本发明的实施例的用于挺柱的壳体的透视图。图6是根据本发明的实施例的用于挺柱的壳体的俯视图。图7是根据本发明的实施例的用于挺柱的壳体的侧 视图。
如图4所示，挺柱包括壳体10、销柱20、滚子30和滚动体(未示出)。根据本发明的挺柱可以应用于燃料供应系统中，设置在凸轮轴的凸轮和高压燃料泵的柱塞之间。挺柱能够设置在燃料供应系统的例如汽缸盖的安装孔中做往复运动，并带动与之相连接的柱塞做往复运动。
壳体10呈大致空心圆柱形。挺柱可以经由壳体10的径向外表面在例如汽缸盖的安装孔中上下滑动。壳体10包括沿轴向位于驱动侧(上侧)的第一部段11和位于从动侧(下侧)的第二部段12。在本发明中，驱动侧表示挺柱与凸轮接触的一侧，而从动侧表示挺柱与柱塞连接的一侧。沿壳体10的轴向观察，第一部段11的外径小于第二部段12的外径。因此，壳体10大致呈阶梯状的圆筒形。第一部段11和第二部段12是一体形成的。在一些实施例中，第一部段11的壁厚小于第二部段12的壁厚。
销柱20可以固定在壳体10的第一部段11中。壳体10在第一部段11中设置有孔13。在示例性实施例中，如图5所示，第一部段11包括相对设置的两个平坦部111和相对设置的两个弧形部112。两个平坦部111和两个弧形部112交替设置。孔13分别设置在平坦部111上。销柱20可以通过其两端插入到孔13中，并且例如通过铆接等方式固定到壳体10。平坦部111从壳体10的径向外表面向内凹陷。
滚子30具有圆筒形状，并且可以可转动地套在销柱20上。从而，滚子30可以可转动地设置在壳体10的第一部段11中。滚子30用于与凸轮轴的凸轮接触。根据本发明的实施例，挺柱还可以包括设置在滚子30的内表面和销柱20的外表面之间的多个滚动体，例如滚针。因此，销柱20通过滚动体以能够旋转的方式支承滚子30，从而滚子30可转动地设置在壳体10上。
如图4至图7所示，为保证滚子30与凸轮之间始终保持线接触，壳体10还包括抗扭转部件14。抗扭转部件14是从第一部段11向径向外侧弯曲突出的。根据本发明的实施例，沿轴向观察，抗扭转部件14延伸超过第二部段12的径向外表面。因此，抗扭转部件14是从壳体10的第一部段11一体地突出的部件。具体地，抗扭转部件14可以是从壳体10的第一部段 11通过冲压而形成的。
当挺柱安装在例如汽缸盖的安装孔中时，抗扭转部件14嵌入在设置于汽缸盖的安装孔的内壁上的滑动槽中。根据本发明的实施例，由于第一部段11的外径小于第二部段12的外径，所以壳体10通过第二部段12的径向外表面在安装孔中上下滑动，而第一部段11的径向外表面不与安装孔的内表面接触。同时，抗扭转部件14嵌入到设置在安装孔的内表面上的滑动槽中，并且随着壳体10在安装孔中的上下滑动而在滑动槽中上下滑动。
在示例性实施例中，抗扭转部件14与第一部段11是连续而未分离的。这表明抗扭转部件14与第一部段11没有分离或断裂开。这种情况下，抗扭转部件14和第一部段11的完整性没有被破坏，从而可以减少对壳体10的后续处理工艺，降低壳体10的制造成本，同时提高壳体10的使用寿命。
在示例性实施例中，如图4至图7所示，抗扭转部件14形成于第一部段11的一个弧形部112上。为便于成形，抗扭转部件14设置在靠近第一部段11的上端部的位置。在示例性实施例中，如图5和图7所示，抗扭转部件14的上端面与第一部段11的弧形部112的上端面平齐。这种情况下，例如用于冲压的冲头等很容易伸入到第一部段11的内部并且实现抗扭转部件14的成形，这可以降低壳体10的制造难度和成本。
在示例性实施例中，在形成抗扭转部件14之前第一部段11的壁厚小于第二部段12的壁厚，所以能够减小抗扭转部件14的冲压工艺所需的变形力。这有利于抗扭转部件14的加工成形，同时也有助于壳体10的轻量化。
在示例性实施例中，抗扭转部件14的径向外表面至少部分地呈向外突出的圆弧状。这表明沿轴向观察，抗扭转部件14的径向外轮廓的至少一部分形成为圆弧状。当挺柱安装在例如汽缸盖的安装孔中并且抗扭转部件14嵌入在设置于汽缸盖的安装孔的内壁上的滑动槽中时，抗扭转部件14的径向外表面用于至少部分地与滑动槽的内表面接合。滑动槽通常具有圆弧形的内表面。在抗扭转部件14的径向外表面至少部分地呈圆弧状时，根据本发明的实施例的包括抗扭转部件14的挺柱可以直接安装在例如现有的汽缸 盖上，而无需对汽缸盖等的结构进行改造。因此，根据本发明的实施例的壳体和挺柱可以具有更广泛的适用性。
根据本发明的某些实施例，如图5和图6所示，沿轴向观察，抗扭转部件14的径向外轮廓整体呈圆弧状。这表明沿轴向观察，抗扭转部件14的径向外轮廓形成为具有均匀曲率半径的一个圆弧。根据本发明的某些实施例，抗扭转部件14的径向外表面的两个角部分别呈圆弧形。抗扭转部件14的径向外表面的角部表示：在俯视图中，抗扭转部件14沿壳体10的周向位于两端的部分。这种情况下，抗扭转部件14的径向外表面在两个角部之间的中间部分可以呈圆弧形或平直的。当径向外表面在两个角部之间的中间部分呈圆弧形时，中间部分的曲率半径可以不同于角部的曲率半径。例如，中间部分的曲率半径可以大于角部的曲率半径。
上文描述抗扭转部件14的径向外表面至少部分地呈向外突出的圆弧状。但是，本发明不限于此。根据本发明的实施例，抗扭转部件14可以具有任意的形状，以与滑动槽配合。
根据本发明的某些实施例，第二部段12的径向外表面是经过磨削的表面，而第一部段11的径向外表面是未经磨削的表面。因此，第二部段12的径向外表面可以具有比第一部段11的径向外表面更高的精度。在现有壳体的制造过程中，壳体的径向外表面需要整体经过磨削，以满足尺寸精度和配合精度要求。根据本发明的实施例，由于壳体10通过第二部段12的径向外表面在安装孔中上下滑动而第一部段11的径向外表面不与安装孔的内表面接触，所以第一部段11的径向外表面可以不经过磨削加工。由此，可以降低壳体的加工精度要求，同时降低壳体的制造难度和制造成本。
下面描述根据本发明的某些实施例的壳体的制造方法。首先，形成(例如通过锻造)具有第一部段11和第二部段12的壳体10，第一部段11的外径小于第二部段12的外径。然后，在壳体10的第一部段11中形成(例如通过冲压)抗扭转部件14，其中抗扭转部件14是从第一部段11向径向外侧弯曲突出的并且沿轴向观察超过第二部段12的径向外表面。最后，对第二部段12的径向外表面进行磨削，以满足壳体10的精度要求。可选地，在磨削之前，还可以对壳体10进行热处理、表面处理等，以提高 壳体10的力学性能。通过使抗扭转部件14从第一部段11弯曲突出，在磨削过程中磨削刀具可以避开抗扭转部件14对第二部段12进行磨削，从而不会影响进行磨削加工。
在示例性实施例中，抗扭转部件14从侧面观察整体位于第二部段上方。由此，可以保证抗扭转部件14与第二部段12在轴向上没有彼此重叠的区域，从而可以确保抗扭转部件14不会对第二部段12的磨削加工和滑动操作产生不利影响，同时可以降低磨削精加工难度。
尽管已经参考示例性实施例描述了本发明，但是应理解，本发明并不限于上述实施例的构造和方法。相反，本发明意在覆盖各种修改例和等同配置。另外，尽管在各种示例性结合体和构造中示出了所公开发明的各种元件和方法步骤，但是包括更多、更少的元件或方法的其它组合也落在本发明的范围之内。

Claims (10)

  1. 一种用于挺柱的壳体，包括沿所述壳体的轴向位于驱动侧的第一部段和位于从动侧的第二部段，其中，所述壳体的所述第一部段的外径小于所述第二部段的外径，所述第一部段和所述第二部段是一体形成的，并且所述壳体还包括抗扭转部件，其中，所述抗扭转部件是从所述第一部段向径向外侧弯曲突出的并且沿轴向观察超过所述第二部段的径向外表面。
  2. 根据权利要求1所述的壳体，其中，所述抗扭转部件与所述第一部段是连续而未分离的。
  3. 根据权利要求2所述的壳体，其中，所述壳体包括相对设置的两个弧形部，所述抗扭转部件形成于所述第一部段的两个所述弧形部中的一者上。
  4. 根据权利要求3所述的壳体，其中，所述抗扭转部件的上端面与所述第一部段的所述弧形部的上端面平齐。
  5. 根据权利要求3或4所述的壳体，其中，所述抗扭转部件的壁厚小于所述第一部段的所述弧形部的壁厚。
  6. 根据权利要求5所述的壳体，其中，所述抗扭转部件的径向外表面至少部分地呈向外突出的圆弧状。
  7. 根据权利要求1至6中任一项所述的壳体，其中，所述抗扭转部件从侧面观察整体位于所述第二部段上方。
  8. 根据权利要求7所述的壳体，其中，所述第二部段的径向外表面是经过磨削的表面，使得所述第二部段的径向外表面具有比所述第一部段的径向外表面更高的精度。
  9. 一种挺柱，包括：
    根据权利要求1至8中任一项所述的壳体；
    销柱，固定在所述壳体的第一部段的孔中；和
    滚子，具有圆筒形状并且通过所述销柱可转动地设置在所述壳体的所述第一部段中。
  10. 一种用于挺柱的壳体的制造方法，包括：
    形成壳体，所述壳体包括沿轴向分布的第一部段和第二部段，所述第一部段的外径小于所述第二部段的外径；
    在所述壳体的所述第一部段中形成抗扭转部件，其中所述抗扭转部件是从所述第一部段向径向外侧弯曲突出的并且沿轴向观察超过所述第二部段的径向外表面；以及
    对所述第二部段的径向外表面进行磨削。
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CN108006192A (zh) * 2016-10-28 2018-05-08 斯凯孚公司 凸轮从动辊设备
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DE102004002487A1 (de) * 2004-01-17 2005-08-11 Robert Bosch Gmbh Rollenstößel
JP2013217304A (ja) * 2012-04-10 2013-10-24 Ntn Corp ポンプ用タペット、および高圧燃料ポンプ
CN104514657A (zh) * 2013-09-27 2015-04-15 Skf公司 凸轮从动件、包括此种凸轮从动件的喷射泵和阀致动器及制造方法
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