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
  • F01L1/20—Adjusting or compensating clearance
  • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
  • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
  • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
• • 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
  • F01L1/02—Valve drive
  • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
  • F01L1/047—Camshafts
  • F01L1/053—Camshafts overhead type
• • 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
  • F01L1/18—Rocking arms or levers
  • F01L1/181—Centre pivot rocking arms
  • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
• • 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
  • F01L1/18—Rocking arms or levers
  • F01L1/185—Overhead end-pivot rocking arms
• • 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
  • F01L1/02—Valve drive
  • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
  • F01L1/047—Camshafts
  • F01L1/053—Camshafts overhead type
  • F01L2001/0537—Double overhead camshafts [DOHC]
• • 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
  • F01L1/18—Rocking arms or levers
  • F01L2001/187—Clips, e.g. for retaining rocker arm on pivot
• • 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
  • F01L1/18—Rocking arms or levers
  • F01L2001/188—Fulcrums at upper surface
• • 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

Definitions

• the present invention relates to a valve train assembly for an internal
• rocker arms which are mounted on a common pivot or axle and which
• combustion engine comprises a valve train carrier having a plurality of
• carrier may also have one or more camshafts mounted thereto.
• Such an arrangement can be provided as a pre-assembled unit for
• Each fulcrum may form part of a hydraulic lash adjuster. Accordingly,
• associated fulcrum have co-operating part-spherical surfaces which permit not
• the rocker arm has a part-spherical recess into which a
• part-spherical projection is located.
• arm may be attached to the projection by means of a clip, possibly made of
• the rockers are made of pressed sheet metal (with the final
• rocker a roller with a wide surface which is flat in a direction parallel to the
• the camshaft need not be so strong, and indeed it is possible to
• rockers can be substantially identical, thereby reducing manufacturing costs. .Arrangements embodying the invention will now be described by way
• Fig. 1 is a side view of a prior art rocker arm
• Fig. 2 is a side view, partly in section, of a rocker arm arrangement
• Fig. 3 is a side view of the rocker arm of Figure 2;
• Fig. 4 is a plan view of the rocker arm shown in Fig. 3;
• Fig. 5 is a section along the line V-V of Fig. 3;
• Fig. 6 shows is a section along the line VI-VI in Fig. 3;
• Fig. 7 is a section through a hydraulic tappet forming a fulcrum of the
• Fig. 8 is a transverse section showing a valve train carrier of the
• Fig. 9 is a plan view of the valve train carrier as shown in Fig. 7;
• Fig. 10 is a side view showing another embodiment of a valve train
• Fig. 11 is a perspective view, from below, of a valve train carrier of
• Fig. 1 shows a prior art rocker (B) made of pressed aluminium
• rocker (B) carries other rockers arranged in a row.
• One end of the rocker (B) is in contact with a cam (C) by means of a roller (R'), while the other end has a
• the tappet has a spigot or projection (81) at the base acting on the head
• a double row of camshafts (A') acts on convex surfaces of
• Fig. 2 shows an example of a rocker arm arrangement according to the
• the rocker (B) of the present invention is again a lever of the first
• rocker (B) is a centre-pivoted rocker arm.
• rocker (B) is a centre-pivoted rocker arm.
• V valve (V) against the resilient force of a spring (M).
• the rocker (B) shown in Figs. 3 to 6 is made up of two lateral flanges
• the tappet (4) is fitted in its own fixed seat (45, Fig. 7)
• rocker arm can rotate about an axis X (Fig. 4) and about the
• Rocker (B) comprises at one end a transverse opening (15) into which
• a pivoting trunnion (16) is fitted, the trunnion (16) having opposing recesses
• (B) of the valve shaft which may vary depending on the type of engine.
• roller (R) having needle bearings and located
• Roller (R) is very simple, with a straight cylindrical outside surface
• a resilient sheet (25) is used with flanges (26) folded back on themselves so that the lower section can be attached to the rocker flanges (see
• the resilient sheet has an inlet (27) at the top for the purpose of
• the sheet (30) may be
• the projection or spigot (42) has a relatively
• the aperture is elongate, with its longitudinal axis extended
• cam shaft and valve cam shaft and valve.
• alternative arrangements are possible.
• the rocker arm could be fastened to the head (41) by means of a rivet
• the head (41) possibly engaging therein by means of a screw thread or by a resilient enlarged portion which engages in an annular ridge within the recess.
• fulcrum be fairly loose, and arranged so as not to inhibit the intended
• Fig. 7 is a detailed view of the tappet (4), which keeps rocker (B)
• fulcrum forms a plunger which is attached to a chamber (43) which slides in a
• the oil is supplied through the inlet (50) and
• Inlets (46) and (46') are provided in the spigot (42) for the purpose of
• FIGs. 8 and 9 show from the side and from above
• engine cylinder head has a lower head part (80) into which the valves (VI) and (V2) are installed. Their springs (M) are located in recesses (60) of the
• valve train carrier formed by the cover (L)
• one version may have hydraulic lash adjusters
• rocker arms provided with rollers, and another, less-expensive one may
• the location of the respective fulcra on the cover (L) can be selected
• the camshaft is also fitted to the cover (L) during pre-
• A2) are also preferably mounted to the carrier (L) before the entire assembly
• the carriers (L) of either embodiment may have channels for

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Valve-Gear Or Valve Arrangements (AREA)
• Valve Device For Special Equipments (AREA)
• Electrically Driven Valve-Operating Means (AREA)
• Magnetically Actuated Valves (AREA)
• Fluid-Driven Valves (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=11380809

Family Applications (1)

Country Status (7)

Cited By (18)

Families Citing this family (10)

Citations (6)

Family Cites Families (4)

• 1998
  • 1998-10-05 IT IT1998MI002136A patent/IT1302601B1/it active IP Right Grant
• 1999
  • 1999-10-05 JP JP2000574812A patent/JP4558938B2/ja not_active Expired - Lifetime
  • 1999-10-05 EP EP99970148A patent/EP1119689B2/de not_active Expired - Lifetime
  • 1999-10-05 AT AT99970148T patent/ATE258271T1/de not_active IP Right Cessation
  • 1999-10-05 BR BR9914635-5A patent/BR9914635A/pt active IP Right Grant
  • 1999-10-05 DE DE69914348T patent/DE69914348T3/de not_active Expired - Lifetime
  • 1999-10-05 WO PCT/IB1999/001699 patent/WO2000020730A1/en not_active Ceased

Patent Citations (6)

Non-Patent Citations (1)

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