Cam ring for an injection pump
A technology of cam rings and fuel injection pumps, which is applied in the direction of pumps, multi-cylinder pumps, liquid displacement machinery, etc., can solve problems such as excessive fatigue and wear, and achieve the effect of saving radial structural space
Inactive Publication Date: 2008-07-16
SIEMENS AG
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Problems solved by technology
[0005] By applying the sliding layer material directly to the surface of the cam ring delimiting the holes according to the invention and by eliminating the steel back as carrier for the sliding layer material according to the invention, or in other words the cam ring itself as carrier or support for the sliding layer material , which can solve the problem of causing excessive fatigue and high wear, that is, the arching of the cam ring due to the high insertion force of the plain bearing bushing
Method used
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Embodiment Construction
[0028] 1 and 2 show two views of a cam ring 2 according to the invention which is used in particular on a high-pressure injection pump of a diesel internal combustion engine. The cam ring 2 is solid and most often has the shape of a sleeve. It has a central bore 4 for a slightly eccentric drive shaft section, not shown. On its outer circumference, the cam ring 2 has three flattened, planar outer sections 6 , on which the pressure-displacement elements (piston parts) of the fuel injection pump can each be supported. Through the slightly eccentric transmission of the shaft section, each of the suppression elements reciprocates along the direction of the double arrow 8, wherein each of the suppression elements abuts against the root of the outer section 6 relative to the outer section in the plane direction of flattening the outer section 6. Sliding movement (see double arrow 10).
[0029] A plain bearing part 12 for supporting an eccentrically driveable shaft section (not show...
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The invention relates to a cam ring (2) for an injection pump for an internal combustion engine, comprising a round opening (4) for a shaft section, which can be eccentrically driven, and comprising a flattened outer section (6) against which a displacer element of the injection pump can be supported. A bush-shaped low-friction bearing means (12) for mounting the shaft section is provided inside the opening (4) of the cam ring (2). In order to reduce the problematic effects of pressing in the low-friction bearing means into the opening, the cam ring is designed so that the low-friction bearing means (12) comprise a polymer-based bearing coating material (14) with friction-reducing fillers, which is directly placed upon the surface (16) of the cam ring (2) that delimits the opening (4).
Description
technical field [0001] The invention relates to a cam ring for a fuel injection pump of an internal combustion engine, which has a round hole for an eccentrically driveable shaft section and at least one flattened outer section, on which a pressure-displacement element of a fuel injection pump can be supported, wherein A sleeve-shaped plain bearing for supporting the shaft section is arranged in the bore of the cam ring. Background technique [0002] In known cam rings, the plain bearing part is formed in the manner of a plain bearing bush from a steel / plastic composite material. It consists of a steel support layer (steel backing) and a porous support layer formed on the support layer, usually composed of bronze, in whose pores a polymer-based sliding layer material is inserted. Such plain bearing bushings are manufactured from endless strip steel material, which is cut from a slab and rolled up so that the seam is formed. They are pressed into the bore of the cam ring wi...
Claims
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IPC IPC(8): F04B1/04
CPCF04B1/0413
Inventor 沃尔夫冈·比克勒吕迪格·比克勒乌韦·尼格林
Owner SIEMENS AG