Classifications

• • 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
  • F02M59/102—Mechanical drive, e.g. tappets or cams
• • 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
  • F01L1/146—Push-rods
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
  • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
  • F04B1/0404—Details or component parts
  • F04B1/0408—Pistons
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
  • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
  • F04B1/0404—Details or component parts
  • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
• • 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
  • F01L2305/00—Valve arrangements comprising rollers
• • 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
  • F01L2305/00—Valve arrangements comprising rollers
  • F01L2305/02—Mounting of rollers

Definitions

• a multifunctional roller clip for a roller tappet assembly The present invention relates to a roller tappet assembly, more particularly relates to a multifunctional clip for the roller tappet assembly. Furthermore, the present invention relates to a fuel injection pump, in particular a high-pressure fuel pump, comprising such a roller tappet assembly.
• Existing fuel injection pumps comprising tappet assembly have a separate housings or clips for roller and piston of a tappet.
• One of the housings serve the purpose of retaining the plunger in position and other housing is used to keep the roller and shoe in position.
• FIG. 1 shows cross sectional view of the roller tappet assembly according to the prior art.
• the roller clip according to the prior art is not a multifunctional part.
• the tappet assembly comprises additional parts such as a clip, a spring retainer and a support ring.
• the roller clip is not limiting the roller movement in the roller axis.
• the tappet assembly comprises more number of parts which increases the manufacturing cost.
• the object of the present invention is to develop a roller clip which is multi functional in nature and also the tappet assembly having less number of components which is economical as well.
• a tappet assembly in particular for fuel injection pumps, comprising a piston, a spring enclosing the piston, a shoe configured to accommodate a roller and a roller clip.
• the roller clip comprises a piston holding portion, a spring supporting surface, a pair of extended portions of the spring supporting surface.
• the piston can be attached to the piston holding portion by any of the ways but not limited to the way such as press fitting or circlipping or welding.
• the pair of extended portions of the spring supporting surface is configured to act as a restricting element to prevent movement of the roller.
• the extended portions of the spring supporting surface comprise a bulged profile at its bottom end and the axis of the bulged profile is in line with axis of the roller.
• the spring sits onto the spring supporting surface of the roller clip.
• the tappet assembly comprises the roller clip assembled in such a way that a clearance is provided between the roller clip and the shoe.
• the tappet assembly comprises the roller clip is made as a single unit and can be made of metallic and non-metallic material.
• the disclosure provides for a method of assembling a tappet assembly comprising acts of placing a roller into a shoe; attaching a piston to a piston holding portion of the roller clip by predetermined way such as press fitting, circlipping and welding; placing a spring onto a spring supporting surface of the roller clip; and placing assembled roller and the shoe into extended portions of the spring supporting surface.
• the piston contacts the shoe after assembling.
• FIG. 1 shows cross sectional view of the roller tappet assembly according to the prior art.
• FIG. 2 shows cross sectional view of the roller tappet assembly according to the present disclosure.
• FIG. 3 shows cross sectional front view of the tappet assembly according to the present disclosure.
• FIG. 4 shows top view of the tappet assembly according to the present disclosure.
• FIG. 5 shows perspective view of the tappet assembly according to the present disclosure.
• FIG. 6 shows exploded view of the tappet assembly according to the present disclosure.
• FIG. 7 shows side view of the tappet assembly according to the present disclosure.
• FIG. 2 illustrates cross sectional view of the tappet assembly 1 according to the present disclosure.
• the tappet assembly 1 comprises a piston 2, a spring 3 enclosing the piston 2, a shoe 4 configured to accommodate a roller 5 and a roller clip 6.
• the roller clip 6 comprises a piston holding portion 7, a spring supporting surface 8, and a pair of extended portions 9 of the spring supporting surface 8.
• the pair of extending portions 9 is configured to act as a restricting element to prevent movement of the roller 5.
• the extended portions 9 are extended downwards to middle or axis (B-B) of the roller 5.
• the extended portion 9 of the spring supporting surface 9 further includes a bulged profile 10 at its bottom end. The bulged profile 10 is made by punching the extended portion 9 from exterior surface.
• FIG. 3 illustrates a cross sectional front view of the tappet assembly according to the present disclosure. It also illustrates that the roller 5 is placed into the shoe 4 before assembling with roller clip 6 of the tappet assembly 1. The piston 2 is attached to the by the piston holding portion 7 of the roller clip 6.
• FIG. 4 illustrates a top view of the tappet assembly 1 according to the present disclosure.
• the shoe 4 is guided on its outer diameter and movement of the shoe 4 is limited. Further, a venting channel is created around the shoe 4 since there is no side guidance of shoe 4 is observed.
• FIG. 5 illustrates a perspective view of the assembled tappet assembly 1 according to the present disclosure.
• the spring 3 encloses the piston 2 and sits on the roller clip 6.
• the spring 3 is retained by the roller clip 6 as it compresses and expands ,
• the piston 2 of the tappet assembly 1 can be attached to the piston holding portion 7 by any of the ways but not limiting to press fitting or circlipping method and by way of welding.
• the piston holding portion 7 of the roller clip 6 is made such that the piston 2 contacts top surface of the shoe 4 of the tappet assembly 1 after complete assembling.
• FIG. 6 illustrates an exploded view of the tappet assembly according to the present disclosure.
• a method of assembling a tappet assembly 1 comprising acts of placing a roller 5 into a shoe 4, attaching a piston 2 to a piston holding portion 7 of the roller clip 6 by predetermined way but not limited to a way selected from a group comprising press fitting, circlipping and welding, placing a spring 3 onto a spring supporting surface 8 of the roller clip 6, and placing the assembled roller 5 and the shoe 4 into extended portions 9 of the spring supporting surface 8.
• the extended portions 9 of the spring supporting surface 9 comprise a bulged profile 10 at its bottom end on each of the extended portions 9 and are aligned with axis (A-A) of the roller 5.
• the piston 2 contacts top surface of the shoe 4 after as ⁇ sembling. After assembling the roller clip 6, the translation or movement of the roller 5 in its axial direction is limited. During downward motion of the piston 2, the spring 3 applies load onto the spring supporting surface 8 and then onto the roller clip 6 which in turn transfers force/load to the roller 5.
• FIG. 7 illustrates a side view of the tappet assembly 1 according to the present disclosure.
• the roller clip 6 is assembled in such a way that a clearance (B) on all the sides is provided between the roller clip 6 and the shoe 4.
• the roller clip 6 is configured into a single unit and can be made of material selected from any of the material such as metallic and non-metallic materials.
• the sequence of upward motion of force is as follows. Firstly, the roller 5 which is in contact with a cam lobe (not shown) of a cam of an engine contacts the shoe 4.
• the tappet assembly 1 could find its ap ⁇ plication in a fuel injection pump of an internal combustion engine of a vehicle.
• the roller clip is a single piece that serves multiple functions and thus the roller clip is multifunctional in nature.
• the roller clip fits compactly and saves room at the bottom of the piston.
• the tappet assembly comprising the roller clip is less weight which has a positive effect on the moving masses.
• the tappet assembly is economical as the cost of a separate housing, a clip to hold the shoe, and another clip to retain the spring is eliminated.
• the tappet assembly comprising a shoe guided about its outer diameter has enhanced ventilation possibilities.

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=49322382

Family Applications (1)

Country Status (4)

Cited By (2)

Citations (4)

Family Cites Families (5)

• 2013
  • 2013-10-09 WO PCT/EP2013/071034 patent/WO2014056975A1/en active Application Filing
  • 2013-10-09 CN CN201380040317.1A patent/CN104641102A/zh active Pending
  • 2013-10-09 EP EP13774179.9A patent/EP2850310B1/en active Active
  • 2013-10-09 KR KR1020157001733A patent/KR101656089B1/ko active IP Right Grant

Patent Citations (4)

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