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
  • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
• • 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
  • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
  • F01L13/0005—Deactivating valves
• • 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
  • F01L1/143—Tappets; Push rods for use with overhead camshafts
• • 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
  • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
  • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
  • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
• • 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
  • F01L2307/00—Preventing the rotation of tappets

Definitions

• the invention relates to a switchable tappet for a valve train of an internal combustion engine, with an annular section which has a shirt for oscillating mounting in an internal combustion engine receptacle and axially movably accommodates a circular section in its bore, both sections being in at least one axial displacement position relative to one another at least one radially or secant-like displaceable slide can be coupled to one another, which runs in the uncoupled state in the circular section, with receptacles for the slide being provided in the region of the bottoms of the sections and with an outer jacket of the circular section being enclosed by at least one compression spring which at one end against the Bottom of the annular section and at the other end acts against a support of the circular section remote from the ground.
• Such a tappet is previously known from US Pat. No. 5,651,335.
• two slides are arranged near the bottom of the circular section, which for the coupling case can be displaced radially outward into a corresponding receptacle of an annular section.
• its annular section is relatively complicated to manufacture. The reason for this is that its recordings are connected in one piece to it.
• the relatively massive crossbar for formation thus present in the annular section the recordings make a particularly chipless production of the annular section relatively expensive.
• only a relatively short compression spring can be applied as a lost motion spring because of the crossbars.
• the object of the invention is therefore to provide a switchable plunger of the aforementioned type, in which the disadvantages cited are eliminated with simple means.
• this object is achieved in that the receptacle of the annular section is manufactured as a separate, sleeve-like component which extends only over a small part of an annular width of the annular section and extends with its inner edge directly in front of the outer jacket of the circular section, the component radially outside and in the axial direction of the bucket tappet is at least partially enclosed by the compression spring.
• radial webs in the annular section are not completely dispensed with on the bottom, but these are only weakly ribbed trained and serve a system of a ring part for the compression spring as a lost motion spring and possibly as a subdivision for two separate hydraulic fluid rooms.
• a slide arranged in the circular section should be applied.
• two slides are also conceivable, which can be displaced radially outwards for a coupling purpose.
• two diametrically opposite, sleeve-like components must then be applied in the annular section.
• a piston or pin is intended as a slide.
• other coupling elements such as jacks, balls, wedges and the like are also conceivable.
• the sleeve-like component has only a small depth and is preferably made from a sheet metal material. Here is a simple deep-drawing process for its manufacture. If necessary, a plastic or other lightweight component can also be used.
• the sleeve-like component has at least one ventilation opening (not to be explained in more detail) or a ventilation channel in order to avoid an undesirable build-up of an air cushion during the coupling process.
• the ring approach from the inner edge of the bottom of the annular section serves, on the one hand, for excellent guidance of the circular section in the annular section. On the other hand, it has a radial opening for easy attachment of the sleeve-like component.
• the receptacle for the slide in the circular section need only have a relatively small length. Otherwise, the coil spring would have to be applied to the front of the slide.
• the radial webs extending from the bottom of the annular section serve, as mentioned, to rest an annular part.
• two segment-like spaces for hydraulic medium can be realized, at least one space being used for supplying the hydraulic medium in front of an end face of the slide.
• the further space can be hydraulically connected to the first-mentioned space.
• it can also serve as a storage space for supplying an optionally applied hydraulic play compensation element in the circular section. If necessary, the slide or the hydraulic element can be supplied with hydraulic fluid from the cylinder head almost directly via a hole in the shirt.
• Figures 1, 2 show the cup tappet according to the invention in longitudinal sections offset from one another by 90 °.
• the tappet 1 consists of an annular section 2, which receives a circular section 5 with its outer casing 4 axially movable in its bore 3. Both sections 2, 5 each have a bottom 6, 7 for a cam contact. The bottom 6 is acted upon by a cam with a larger stroke than the bottom 7. Furthermore, the annular section 2 has a shirt 8, via which the tappet 1 can be stored in a receptacle of a cylinder head of an internal combustion engine, not shown.
• the circular section 5 has, in the vicinity of its base 7, a receptacle 9, which runs radially here, for a piston-like slide 10.
• the slide 10 is partially enclosed by a coil spring 11. This serves to displace the slide 10 in the decoupling direction.
• An end face 12 of the slider 10 is located in the region of the bottom 6 of the annular section 2, when the cams pass through a base circle, a receptacle 13. This is produced here as a sleeve-like component 14 and has only a relatively small depth.
• the component 14, for example made of deep-drawn sheet metal, runs in a ring extension 15 which extends from an inner edge 16 of the base 6 of the annular section 2 in a direction away from the base.
• two diametrically opposed radial webs 16a, 16b extend from the bottom 6 of the annular section 2. These serve on the one hand to stiffen the entire annular section 2 and on the other hand to rest an annular part 17, here funnel-like geometry.
• the compression spring 18 is also referred to as a lost motion spring.
• spaces 20, 21 in the form of a segment of a circle are formed between the base 6 and the ring part 17, divided by the radial webs 16.
• the space 20 serves as a storage space for hydraulic medium for displacing the slide 10 in the coupling direction, that is to say in sections into the sleeve-like component 14.
• the space 21 can be hydraulically connected to the space 20, but it can also serve as a storage space for supplying a hydraulic play compensation element 22 arranged in the circular section 5.
• the outer jacket 4 of the circular section 5 has a flattened portion 24 in the circumferential area of an inner edge 23 of the component 14. A simple anti-rotation lock of the circular section 2, 5 is created.
• FIG. 1 also discloses that a bottom-side jacket section 25 of the component 14, together with an overhang 26 of the circular section 5 that overlaps it, forms an axial stop for the circular section 2, 5 relative to the circular section.

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)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7692361

Family Applications (1)

Country Status (7)

Families Citing this family (11)

Family Cites Families (7)

• 2001
  • 2001-07-19 DE DE10135175A patent/DE10135175A1/de not_active Withdrawn
• 2002
  • 2002-06-15 EP EP02743210A patent/EP1407122A1/de not_active Withdrawn
  • 2002-06-15 KR KR10-2003-7017226A patent/KR20040019030A/ko not_active Application Discontinuation
  • 2002-06-15 WO PCT/EP2002/006615 patent/WO2003008771A1/de not_active Application Discontinuation
  • 2002-06-15 BR BR0205764-6A patent/BR0205764A/pt not_active Application Discontinuation
  • 2002-06-15 JP JP2003515064A patent/JP2004522064A/ja active Pending
• 2004
  • 2004-01-16 US US10/759,316 patent/US6805084B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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