Roller tappet for a fuel pump

Patent metadata

Field	Value
Publication number	US-2022010691-A1
Application number	US-201917291629-A
Country	US
Kind code	A1
Filing date	Sep 25, 2019
Priority date	Nov 13, 2018
Publication date	Jan 13, 2022
Grant date	—

Abstract

A roller tappet for a fuel pump is provided that has a guide housing which includes a drive-side and output-side section of the same external diameter, and a separate support body extending longitudinally through the guide housing. An upper face on the drive-side section carries a pin with a roller thereon. A lower face of the output-side section interacts at least indirectly with an arrangement for a pump piston. The guide housing includes a drive-side section and an output side section that are separate, axially spaced rings connected to one another via the support body. The support body has a first ring area with the upper face and a second ring area with the lower face. The first ring area is connected to an inner jacket of the drive-side section and the second ring area is connected to an inner jacket of the output-side section.

First claim

1 . A roller tappet for an internal combustion engine, the roller tappet comprising:
a guide housing having:
a drive-side section, and
an output-side section axially spaced and separated from the drive-side section, each of the drive-side section and the output-side section configured with a same outer diameter,
a separate support body having:
a first end having a first ring area fixedly connected to the drive-side section, the first ring area having a pin configured to receive a roller,
a second end having a second ring area fixedly connected to the output-side section, the second ring area arranged to receive a pump piston, and
longitudinal struts arranged to fixedly connect the first ring area to the second ring area.

2 . The roller tappet of claim 1 , wherein the support body with the longitudinal struts and the first and second ring areas is in one piece and is produced from thin-walled sheet steel by punching and bending.

3 . The roller tappet of claim 1 , wherein the first and second ring areas of the support body are connected via two longitudinal struts, and at least the first ring area of the support body is formed with opposed flat, indented extensions, each of the flat, indented extensions: i) adjoined with one of the two longitudinal struts, and ii) having a bore configured to receive the pin.

4 . The roller tappet of claim 1 , wherein a first inner jacket of the drive-side section is fixedly connected to the first ring area and a second inner jacket of the output-side section is fixedly connected to the second ring area.

5 . The roller tappet of claim 1 , wherein an exposed length of the longitudinal struts of the support body exceeds a sum of a first length of the longitudinal struts covered by the drive-side section and a second length of the longitudinal struts covered by the output-side section

6 . The roller tappet of claim 1 , wherein the output-side section of the guide housing is formed with a cross strut, and a lower face of the second ring area abuts with the cross strut.

7 . The roller tappet of claim 1 , wherein at least one of the drive-side section or the output-side section of the guide housing is produced from sheet steel.

8 . The roller tappet of claim 1 , wherein the drive-side section and the output-side section are welded, riveted, clipped or press-fitted to the corresponding first and second ring areas of the support body.

9 . The roller tappet of claim 1 , wherein:
the first ring area further comprises a first bore and a second bore, each of the first and second bores configured to receive the pin, and the drive-side section further comprises a third bore aligned with the first bore, and a fourth bore aligned with the second bore.

10 . The roller tappet of claim 1 , wherein the output-side section further comprises an anti-rotation body protruding from an outer jacket of the output-side section.

11 . The roller tappet of claim 3 , wherein the at least the first ring area further comprises two opposed end faces configured to form a portion of the at least the first ring area arranged outside of the opposed flat, indented extensions.

12 . The roller tappet of claim 11 , wherein a first end face of the two opposed end faces is offset from a second end face of the two opposed end faces.

13 . The roller tappet of claim 11 , wherein a first end face of the two opposed end faces engages a second end face of the two opposed end faces.

14 . A tappet for an internal combustion engine, the tappet comprising:
a drive-side housing, an output-side housing axially spaced and separated from the drive-side housing, the output-side housing and the drive-side housing having a same outer diameter, and a support body having:
a first ring area at a first end, the first ring area fixedly connected to the drive-side housing, and
a second ring area at a second end, the second ring area fixedly connected to the output-side housing, and
at least one longitudinal strut fixedly connecting the first ring area to the second ring area, and
the first ring area, the second ring area, and the at least one longitudinal strut are integrally formed from one piece.

15 . The tappet of claim 14 , wherein the first ring area, the second ring area, and the at least one longitudinal strut are integrally formed via bending of sheet steel.

16 . The tappet of claim 15 , wherein the drive-side housing and the output-side housing are formed as steel rings via a drawing process.

17 . The tappet of claim 16 , wherein a first inner jacket of the drive-side housing is fixedly connected to the first ring area and a second inner jacket of the output-side housing is fixedly connected to the second ring area.

18 . The tappet of claim 17 , wherein the output-side housing is formed with a transverse strut configured to abut with an end of the support body.

19 . The tappet of claim 17 , wherein at least one of the first ring area or the second ring area is formed with two opposed flat, indented extensions configured with bores to receive a pin configured for a roller.

20 . A tappet for an internal combustion engine, the tappet comprising:
a drive-side housing ring, an output-side housing ring having a same outer diameter as the drive-side housing ring, and a support body having:
a first ring area fixedly connected to the drive-side housing ring, the first ring area having two flat, indented extensions configured to receive a pin configured for a roller,
a second ring area fixedly connected to the output-side housing ring and axially offset from the first ring area, and
at least one longitudinal strut configured to fixedly connect the first ring area to the second ring area, and
the drive-side housing ring is axially offset from the output-side housing ring such that a portion of the at least one longitudinal strut is not surrounded by either of the drive-side housing ring or the output-side housing ring, defining an exposed portion arranged between the drive-side housing ring and the output-side housing ring in a longitudinal direction of the at least one longitudinal strut.

Assignees

• Schaeffler Technologies Ag

Inventors

• Geyer Norbert

Classifications

• F02M59/102 Primary

  Mechanical drive, e.g. tappets or cams (F02M45/063 takes precedence) · CPC title

• F04B1/0426

  Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam · CPC title

• F01L2305/00

  Valve arrangements comprising rollers · CPC title

• F16H53/06 Primary

  Cam-followers (F16H53/08 takes precedence) · CPC title

• F01L1/14 Primary

  Tappets {(hydraulic tappets for automatically adjusting or compensating clearance F01L1/24)}; Push rods · CPC title