Roller tappet for fuel pump
A technology of fuel pumps and rollers, applied in fuel injection pumps, fuel injection devices, pumps, etc., can solve the problems of high cost, inapplicability, and many parts, and achieve the effect of low cost
Pending Publication Date: 2021-07-23
SCHAEFFLER TECH AG & CO KG
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- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The roller tappets were found to be too complex to manufacture, with too many parts, and overall made mass production prohibitively expensive
In addition, it is not suitable for pump drives with long installation lengths
The above extrusion or deep drawing reaches the limit of production technology
Method used
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Experimental program
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Embodiment Construction
[0022] figure 1 , figure 2 A roller tappet 1 for a fuel pump is shown in . It has a one-piece, thin-walled and "slim" guide housing 2 . "Slender" here means that the roller tappet 1 (more precisely its guide housing 2 ) is at least 1.5 times its width. Optionally, ratios > about 1.2 are also considered.
[0023] A roller 5 mounted on the pin 4 is framed by the drive side edge 3 of the guide housing 2 , protrudes slightly beyond the drive side edge 3 and is guided on the inner wall 9 by a flat surface 7 discussed below. In the case of guiding the output-side edge 8 of the housing 2 , a rod 10 with a polygonal profile extending from its inner wall 9 to inner wall 9 is applied. On its output-side outer side 11 it has a flattened contact surface 12 for the driver element (pump piston).
[0024] It can be seen that the guide housing 2 has two diametrically opposite, axially continuous flat surfaces 7 . Here, on the one hand, there is an opening 6 on the drive side, in which ...
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The invention relates to a roller tappet (1) for a fuel pump, comprising an integral and hollow-walled guide housing (2), the drive-side edge (3) of which encloses a roller (5) mounted on a pin (4), the ends (16) of which pin (4) are seated in openings (6) in the guide housing (2), and the openings (6) are situated in indented flat surfaces (7) that originate from the drive-side edge (3) and are diametrically opposite each other, wherein at an output-side edge (8) of the guide housing (2), a bridge piece (10) extends continuously from an inner wall (9) of the one of the flat surfaces (7) to an inner wall (9) of the other, complementary flat surface (7). This bridge piece (10) projects beyond the inner wall (9) towards the outer wall of the particular flat surface (7), wherein the output-side outer face (11) of the bridge piece (10) has a contact surface (12) for a pump piston, wherein the flat surfaces (7) are completely continuous from the drive-side edge to the output-side edge (3, 8) of the guide housing (2). The bridge piece (10) is a separate rod, the end regions of which are seated in complementary receptacles (13) of the flat surfaces (7). These receptacles (13) are openings passing through the wall of the flat surfaces (7), wherein the contact surface (12) of the rod (10) for the pump piston is formed by a longitudinal flattened portion, and wherein the drive-side edge (3) and the output-side edge (8) of the guide housing (2) are plane elevation-free.
Description
technical field [0001] The invention relates to a roller tappet for a fuel pump comprising a one-piece guide housing with a hollow wall, the drive side edge of which surrounds a roller mounted on a pin, the pin The ends of the are seated in openings in the guide housing, and the openings are located in indented flat surfaces originating from the drive side edge and diametrically opposite each other, wherein at the output side edge of the guide housing, the bridge moves from the flat The inner wall of one of the planar surfaces extends continuously to the inner wall of the other complementary planar surface, wherein the bridge protrudes beyond the inner wall towards the outer wall of the corresponding planar surface, wherein the output side outer face of the bridge has contact for the pump piston surface, and wherein the planar surface is completely continuous from the drive side edge to the output side edge of the guide housing. Background technique [0002] A universal rol...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F04B1/0408F04B1/0417F01L1/14
CPCF04B1/0417F04B1/0408F01L1/14F02M59/44F16H53/06
Inventor 诺伯特·盖耶
Owner SCHAEFFLER TECH AG & CO KG