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
  • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
• • 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
  • F01L1/02—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
  • F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
• • 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
  • F01L1/08—Shape of 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
  • F01L1/30—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of positively opened and closed valves, i.e. desmodromic valves

Definitions

• Valve train in particular for internal combustion engines of motor vehicles
• the invention relates to a valve train, in particular for internal combustion engines of motor vehicles, with a driven cam element and with a valve actuator which is displaceable or pivotable by the cam element.
• the valve actuator (valve lifter, rocker arm, rocker arm or the like) is thereby pressed at least during the open phase against a part of a closed valve control surface that is eccentric to the shaft axis.
• positive guides use two axially one behind the other instead of valve control surfaces parallel to the axis of rotation of the camshaft, which are formed on two differently shaped camshaft elements, for example EP-B 355 659, EP-A 384 361, etc.
• Both the first version of the positive guides with grooves on the front and lateral engagement of the scanning element and the second version with two cam elements and two scanning elements per valve have one in relation to the first one Valve train with return spring an enlarged axial extension and a larger number of components that contain either design, spatial or economic problems.
• the invention has now set itself the task of creating a desmodromic valve train of the type mentioned, which substantially reduces the problems mentioned and is a space-saving, lightweight and inexpensive construction.
• cam element is rotatably arranged in a flexible enclosing element which is movably connected to the valve actuator in a plane perpendicular to the axis of rotation of the cam element.
• the encircling element surrounds the circumference of the cam element without significant play, so that it is adapted to the shape of the cam, and the cam element can twist in the latter due to the nature of the encircling element. Since the encircling element connected to the valve actuator cannot rotate with the cam element, the migration of the cam region around the axis of rotation of the cam element is converted into a reciprocating or reciprocating movement of the valve actuator, which is displaceably or pivotably mounted in the cylinder head.
• valve actuator does not move as long as the connection area of the enclosing element with the valve actuator lies against the base circle area of the rotating cam element, is then removed from the axis of rotation of the cam element in the radial direction and finally returned, while the cam area of the cam element connects the connection area of the enclosing element happened with the valve actuator.
• a valve actuator which projects freely from the encircling element would always align itself perpendicularly to the tangent to the circumferential surface of the cam element and thereby on the one hand in the rising and on the other in the declining cam area from the radial orientation to the axis of rotation of the Deviate cam element.
• the movable connection of the enclosing element with the valve actuator permits the pivoting or tilting movement of the enclosing element in the cam area, so that the required freedom of movement of the Valve actuator is maintained in its slide or swivel bearing.
• the enclosing element is therefore in particular arranged on the valve actuator or a holder for the valve actuator so as to be pivotable about an axis.
• the valve actuator preferably has a holder to which the enclosing element is connected, in particular movably, and to which a part guided in the slide or pivot bearing of the valve actuator is preferably held in an adjustable manner.
• the enclosing element has an open loop, the two ends of which are fixed to a holder for the valve actuator.
• the two ends of the open loop penetrate one another or protrude from the cam element in contact with one another, a physical axis may be unnecessary because of the flexibility of the material of the enclosing element, since the two ends can be bent to the required extent together on both sides.
• the two ends of the open loop have plug openings for a connecting element.
• Push-in openings can be made by turning them over and - depending on the material of the
• the flexible enclosing element is designed as a closed loop and is provided with a holder for the valve actuator.
• the integration of the holder in the loop can be achieved in a simple manner by a protuberance in which the holder is arranged.
• the protuberance is achieved in particular by constricting an area of the enclosing element which forms an excess length and which is, for example, clamped, sewn or the like.
• a closed, flexible loop can be formed, for example, by a deformable ring.
• the ring is made of plastic, it can also be fiber-reinforced or reinforced on the inside and / or outside with a steel or fabric band. In this version in particular, a rubber-elastic plastic could be used, which is vulcanized onto the belt.
• the ring has a recess in which a bearing pin of the valve actuator is provided, the axis of which is parallel to the axis of rotation of the cam element.
• Both open and closed loops can be achieved if the enclosing element is a rope, which is in particular inserted into a circumferential groove of the cam element, is a roller chain in which a hinge pin forms the holder of the valve actuator, is a strip or band made of a flat material, in which threads or fibers are provided in a textile weave, or is a band spring which is made, for example, of a titanium alloy and surrounds the circumferential surface of the cam region in one or more windings one above the other.
• a closed rope can for example be threaded through an eyelet of the valve actuator or its holder.
• a material that is seamlessly formed from threads or fibers using a textile rounding technique is particularly suitable for producing a closed loop.
• a round-woven closed loop preferably contains aramid fibers as weft threads, which have a high length constancy and temperature resistance.
• an open loop element in particular a rope, a fabric band or a band spring
• a rope, a fabric band or a band spring can be clamped on the valve member or its holder, be provided with plug-in openings for receiving a connecting pin or split pin, or can also be designed for fastening in another way.
• the windings for fixing the holder can have bores lying one above the other, the diameter of which becomes smaller from the inside to the outside.
• Valve actuator can be used that requires no further fixation.
• the holder can be in two parts and, for example, enclose a bearing part of the valve actuator provided with a ball head that can be gripped behind.
• a ball head at the end of a displaceably mounted valve stem also enables a valve tappet to rotate about its longitudinal axis.
• Another possibility for connecting the Umschi tellungseleme ⁇ tes with the holder provides that the holder of the valve actuator has a bearing pin which is arranged between two turns of the band or the band spring
• the enclosing element consists of a material with a low-friction, possibly low-friction coated surface, then lubrication of the sliding surfaces, that is to say the peripheral surface of the cam element and the adjacent inner surface of the enclosing element, may not be necessary. If lubrication is desired or required, it is preferably provided that the cam element has at least one oil hole radially to the axis of rotation, which opens at the circumference of the cam element within the flexible enclosing element. Since the enclosing element does not twist, an external oil supply through the enclosing element via a flexible line is also conceivable.
• An oil supply that may not be necessary to maintain the sliding properties can also be used to solve a major problem with previous positive controls if the valve is not properly pressed during the closing phase, although a slightly open valve is not reliable even due to excess pressure in the cylinder is pressed into the valve seat.
• An oil film can namely be built up in the small gap between the cam element and the enclosing element, the oil or the oil pressure centering the enclosing element relative to the cam element.
• This effect not only helps with the rotation of the cam element in the enclosing element, but can also be used to generate a valve closing force, which also eliminates the need for a hydraulic element on the valve actuator, which in conventional valves compensates for play in the base circle area.
• the oil film also has a damping function, so that the acceleration and deceleration of the Valve-induced mass forces do not directly affect the cam element and engine noise is reduced.
• an air cushion surrounding the cam element can also be built up by means of compressed air. This can be of particular advantage in the case of a plastic or plastic fabric enclosing element.
• the masses to be accelerated are reduced in the valve train according to the invention by the elimination of the valve spring and the spring plate and by a much lighter design of the valve tappet or rocker arm.
• the use of light metals, ceramics or plastic for the valve and / or the valve actuator allow a reduction in the masses to be accelerated and decelerated from 50% to 80% of the value of a valve lifter with return spring and hydraulic play compensation.
• the high values result in particular in the partial load range, since the valve springs must be designed for full load safety.
• the valve can be made shorter, since the space-consuming valve spring is omitted.
• the oil supply not only causes line contact, but surface contact.
• the cam element can also be made smaller.
• the formation of plastic cam elements or entirely of plastic, for example camshafts produced by injection molding, can also be realized.
• a weak spring can be provided to act on each closed valve.
• FIG. 7 shows a longitudinal section through a second embodiment of a valve spool
• FIG. 8 components of a third embodiment of a valve spool in an oblique view
• FIG. 12 shows a side view of the fourth embodiment
• FIG. 13 shows a cross section through the fourth embodiment
• FIG. 17 shows an enlarged detailed illustration from FIG. 14, FIG. 18 components of a sixth embodiment in an oblique view
• FIG. 22 shows a longitudinal section through the seventh embodiment
• FIG. 23 components of an eighth embodiment in an oblique view
• FIG. 27 shows a longitudinal section through the ninth embodiment
• FIG. 28 shows an end view of the ninth embodiment
• FIG. 29 and 30 longitudinal sections through a tenth embodiment in two different
• FIG. 32 shows an oblique view of the eleventh embodiment
• FIG. 33 shows a longitudinal section through the eleventh embodiment
• FIG. 36 shows an enlarged detailed illustration from FIG. 35
• FIG. 37 is an oblique view of the twelfth embodiment, 38 components of a thirteenth embodiment in an oblique view, FIG. 39 a longitudinal section of the thirteenth embodiment, FIG. 40 components of a fourteenth embodiment in an oblique view, FIG. 41 a cross section through the fourteenth embodiment, FIG. 42 components of a fifteenth embodiment in an oblique view, FIG 43 an oblique view of the fifteenth embodiment, FIG. 44 components of a sixteenth embodiment in an oblique view, FIG. 45 a cross section through the sixteenth embodiment, FIG. 46 an enlarged detailed illustration from FIG. 45, FIG. 47 components of a seventeenth embodiment in an oblique view, FIG 48 shows a longitudinal section through the seventeenth embodiment, and FIG. 49 shows an enlarged detailed illustration of the seventeenth embodiment.
• valve train used for an internal combustion engine of a motor vehicle on the carrier shaft 1 having the number of cam elements 2 required for the valves.
• An oil supply to build up an oil film or compressed air to build up an air cushion on the circumferential surface of the cam element 2 can take place via a hollow carrier shaft, radial openings 30 in the carrier shaft 1 and via bores 3 in the cam element 2.
• a set of openings 30 and bores 3 can, as shown in FIGS. 8 to 10, also be used to fasten the cam element 2 on the carrier shaft 1 when a fixing pin 20 is inserted.
• the cam element 2 is surrounded by a sealing element 4 which lies essentially against the circumferential surface and which consists of a flexible, resilient, possibly also elastic material, so that the cam element 2 can rotate about its axis of rotation 8 in the enclosing element 4 with continuous pulsating deformation of the enclosing element 4 ,
• the cross-sectional shape of the enclosing element 4 is shown in the figures in each case adapted to the cam element 2, since here the valve train is shown in an exploded view.
• the enclosing element 4 has the shape of a ring only in the case of sufficient elasticity and thickness of the material, while it otherwise forms a collapsed oval or the like.
• the enclosing element 4 is prevented from rotating by the connection to a valve actuator 10, which in the case of the valve tappet in one Slide bearing 41 (Fig. 30) is displaceable, in the case of a rocker arm or rocker arm, is pivotally mounted in a pivot bearing.
• a valve actuator 10 which in the case of the valve tappet in one Slide bearing 41 (Fig. 30) is displaceable, in the case of a rocker arm or rocker arm, is pivotally mounted in a pivot bearing.
• the encircling element 4 is connected to the valve actuator ed 10 is pivotably connected or pivotable about an axis 15, so that when the cam of the cam element 2 passes through the connecting area of the valve actuator 10, the encircling element 4 can be pivoted relative to the valve actuator 10. This is necessary because, as in FIGS show that the slide bearing of the valve stem 11 does not allow lateral deflection, and the valve stem 11 must be in radial alignment with the axis of rotation 8.
• FIGS. 2 to 4 also shows the valve lift
• the enclosing element 4 is formed by a ring made of a flexible, possibly slightly elastic, plastic, which has only a low resistance to deformation
• the ring contains a window 5 in which a bearing pin 14 running parallel to the axis of rotation 8 of the cam element 2 passes through the valve stem 11.
• a bearing pin 14 running parallel to the axis of rotation 8 of the cam element 2 passes through the valve stem 11.
• a small gap 31 remains between the band 22 and the circumferential surface of the cam element 2, generally already due to assembly an oil film can form for the sliding lubrication.
• the oil film also has a shock and noise damping effect and, as can be seen from the comparison of FIGS.
• FIG. 7 shows an embodiment in which the enclosing element 4 has a plurality of windings 7 of a band which, for example, consists of a number of one another closed loops (similar to that of band 22 in Fig. 1) made of spring steel, a strip of threads in a textile binding or the like., or which is spirally wound, and can also consist of a metal band, a fabric band or the like ,
• a bearing pin 18 of a preferably two-part holder 12, which carries two valve actuators 10 of identical valves engages between two turns 7 of the enclosing element 4.
• an application with the aid of a spring 26 is also shown, which is not effective for returning the valve actuators 10 to the base circle area, but only for the application of the closed valve.
• FIGS. 8 to 10 show an embodiment in which the holder 12 is designed in the form of an “iron”, the bearing pin 18 being arranged between a band 22 and an enclosing body 4 made of plastic or the like, similar to FIG. 1, and the Forms axis 15.
• the end section of the bearing pin 18 widens slightly in order to prevent the axial slipping in the enclosing element 4, the opposite region of the holding body 12 being chamfered in order to be able to push the holding body 12 laterally in.
• the holding body 12 has a threaded hole, into which the valve stem 11 on the thread 28 can be screwed and can be adjusted by means of a lock nut 27.
• FIGS. 8 to 10 also show a possible fixing of the cam element 2 on the carrier shaft 1 by means of a pin 20 which passes through bores 30 the shaft 1 and holes 3 of the cam element 2 is inserted.
• the enclosing element 4 is formed by a closed rope loop which is slidably arranged in a groove 16 in the peripheral surface of the cam element.
• the cam element is divided into two axially spaced cam regions 43, the groove 16, in which the oil bores 3 of the cam element 2 open, forming the central region.
• the valve stem 11 of the valve actuator 10 is provided with a hook-like eyelet 17, in particular open at the side, into which the rope loop is hooked and rounded on the top parallel to the axis 15 in order to enable the pivoting, as can be seen above all from FIG. 13.
• the eyelet 17 can also be designed to be closed if a piece of a rope is only closed after the threading into the eyelet 17 to form the rope loop.
• the rope can be a wire rope, a plastic rope, etc. 14 to 17 show an embodiment in which the enclosing element 4 is formed from a band or strip from a titanium alloy spring steel, a flat structure made of aramid fibers with a textile bond, in particular a woven fabric or the like.
• a protuberance 6 of the enclosing element 4 is formed, which can be inserted into a slot 29 of the valve stem 11.
• the connection is made by means of a split pin 19 which penetrates the bores 25 of the valve stem 11 and the protuberance 6 (FIG. 17).
• the enclosing element 4 can be a single closed loop or turn with a flattened protuberance 6.
• the single loop or turn can also be formed by combining both ends 13 of a band, which form the protuberance 6 lying against one another and are inserted together into the slot 29.
• the encircling element can, as shown in detail in FIG. 17, also have two turns 17 and be “spirally” wound from one piece.
• the two ends 13 preferably end in the protuberance 6.
• the axis is 15 is not physically realized, but results from the bending area between the protuberance 6 and the part of the enclosing element 4 surrounding the peripheral surface of the cam element 2.
• the encircling element 4 which in turn is formed by a band spring, a fabric band or the like, is designed as an open loop, has a single turn 7 and has free ends 13 with the holder 12 of the valve actuator 10 is connected.
• the two ends 13 are cut or cut in such a way that tongues which can be plugged into one another are formed, in which bores 25 are again provided.
• the ends 13 are bent towards each other and guided around the holder 12 on both sides.
• a cotter pin or pin 19 passes through the two ends 13, the holder 12 and the end of the valve stem 11 inserted into the holder 12.
• the holder 12 is curved at the top, as can best be seen from FIG.
• the axis 15 is again not physically formed, but lies in the penetration of the ends 13, the large radii of curvature ensuring a long service life.
• the ends 13 could also each have a laterally open cut from an edge to half and be inserted into one another from the side.
• 21 and 22 show an embodiment in which the enclosing element 4 (similar to that in FIG. 7) consists of a larger number of windings 7 which are formed by individual, closed loops which can be plugged into one another and therefore have increasing sizes
• the innermost loop which is shown on the left in FIG. 21, surrounds the circumferential surface of the cam element 2.
• the further loops each have an opening 9, the diameter of the openings 9 decreasing from the inside to the outside, i.e. from the second smallest to the outermost, largest loop openings 9 made to coincide thereby form a truncated cone-shaped, outwardly narrowing receiving opening for the truncated cone-shaped holder 12 of the valve actuating element 10.
• the holder consists of two parts 12 'which complement one another and hold the head 34 of the valve actuating element 10 between them, which is spherical is formed and a movement of the enclosing element 4 about the axis 15 permits
• the package of windings 7 of the Umschheßungseiementes 4 is held on the cam member 2 by two axially adjoining end plates 33, each leaving a slight gap between the enclosing element 4 and the end plates 33, in which an oil film can also form.
• the end plates 33 can be connected to the cam element 2 or, as shown, can be axially fixed by sleeves 32, which are each pushed onto the support shaft 1 in the space between an adjacent cam or bearing element
• the enclosing element 4 likewise has a plurality of windings 7, which, however, are not formed by individual closed loops, but by a spiral winding of a single piece of tape, the outer windings here also having bores of different diameters that differ 24 to complement the conically tapering receiving opening for the holder 12.
• the two parts 12 'of the holder take up the head 36 of the valve actuating element 10, which in this embodiment is partially curved about the axis 15.
• a roller bearing is formed in the enclosing element 4 , which has rows of rollers 35 which roll on the circumferential surface of the cam element 2.
• an oil supply through bores 30, 3 from the support shaft 1 or through the enclosing element 4 from the outside is also preferred in this embodiment.
• the rollers 35 become axial through the End plates 33 are held, the end plate 33 being omitted in the end view of FIG. 25 for the sake of clarity.
• FIGS. 26 to 28 A further embodiment is shown in FIGS. 26 to 28.
• the enclosing element 4 is formed by a roller chain, the hinge pins 23 of which laterally connect tabs 24, which also effect the axial guidance on the cam element 2 engaging between the tabs 24.
• a hinge pin is extended and forms the bearing pin 14 for the fork-shaped holder 12 of the valve actuator 10, in which the valve stem 11 is screwed adjustable and fastened by the lock nut 27.
• FIGS. 29 and 30 show an embodiment which corresponds essentially to FIGS. 21 and 22, but in which the valve actuator 10 in the form of a valve tappet is not arranged perpendicular to the axis of rotation 8, but rather is inclined to it.
• the axis 15, about which the wrap element 4 pivots on the valve actuator 10, is also parallel to the axis of rotation 8 in this embodiment.
• the linear movement of the valve stem 11 in a housing or stationary slide bearing 41 produces a movement component in the direction in the connection area with the enclosing element 4 of the axis of rotation 8.
• the enclosing element 4 can therefore be displaced on the cam element 2 in the direction of the axis of rotation 8 by the distance 40.
• the holder 12 can also be arranged displaceably on the enclosing element 4.
• the cam element 2 is provided with a circumferential groove 16, the bottom of which is concentric with the carrier shaft 1.
• the cam element 2 is thereby divided into two cam areas 43, which are connected via a material-saving central area.
• the valve actuator 10 has a bore 46 in the fastening area, so that after insertion into the window 5, a connecting element 48 in the form of a pin or split pin can be pushed through the plug opening 47 and the bore 46.
• band of the enclosing element 4 contains mainly aramid threads or fibers and is preferably a seamless fabric ring or the like, in which at least the weft threads consist of an aramide.
• the fabric can also have a low-friction coating.
• FIG. 34 to 37 show a similar embodiment, in which a round-shaped band, in particular round-woven or the like, is again used to produce the enclosing element 4.
• the band circumference corresponds essentially to twice the circumference of the cam element 2 and is folded into a two-layer open loop.
• the reversal points of the band at the ends 13 of the open loop already form the plug-in openings 47 for the hollow connecting element 48 bent in a U-shape in this embodiment.
• Both ends 13 are cut out in the central region 52, and the two cutouts complement one another to form the window 5 that protrudes the end of the valve stem 11 into the circumferential groove 16 of the cam element.
• the mounting position of the valve actuator 11 can thereby be offset laterally parallel to the axial plane, as can be seen from FIG. 35, which can result in advantages with regard to a change in the rolling and contact lines.
• the valve stem 11 can of course also lie in the axial plane, as a result of which the two plug openings 47 are not symmetrical.
• a second U-shaped part 53 is inserted into the hollow connecting element 48 and glued, for example, so that the connection between the enclosing element 4 and the valve actuator 10 is secured.
• the two ends 13 of the open loop could also be connected by a belt buckle-like element which has one or two slots, through which the ends 13 and through which pins inserted into their insertion openings 47 be fixed.
• the belt buckle-like element represents the holder 12 for the valve actuator into which it is screwed or snapped.
• a sleeve 55 which is provided with a pair of connecting tabs 56 and projects inwards into the circumferential groove 16, is inserted into the window 5 of the enclosing element 4 formed by a closed loop.
• the connecting tabs 56 are connected to the surrounding area of the window 5 glued, welded or the like.
• the valve stem 11 has a thread 28 at the free end, and can be screwed into a thread of the sleeve 55 in an adjustable depth and clamped by means of a lock nut 27.
• the cam element 2 consists of two cam regions 43, which are not connected to one another, but rather are fixed separately on the carrier shaft.
• a latching or snap connection could be formed between the sleeve 55 and the valve stem 11, so that rotation about the axis of the valve stem 11 is possible.
• the enclosing element 4 can be a fabric tape similar to FIG. 31 or a tape spring similar to FIG. 21.
• the axis 15, about which the enclosing element 4 has to pivot back and forth to a limited extent with respect to the valve actuator 10, runs between the connecting tabs 56 due to the flexibility of the material used.
• the enclosing element 4 is in each case embodied in a closed loop with a protuberance 6, which is separated from the cam element 2 by a glued, sewn or clamped constriction and an insert 54 serving as a holder 12 of the valve actuator 10 receives.
• FIG. 40 and 41 show an embodiment in which the closing element 4 is constricted by a flat eyelet 50 through which the flattened protuberance 6 is threaded.
• the insert 54 inserted into the protuberance 6 has a latching or threaded bore 57 into which the latchable or threaded end 28 of the valve stem 11 can be inserted or screwed.
• a lock nut 27 is used to adjust or fix the length of the valve actuator 10.
• a latchable cut-off device is also conceivable, for example by identifying two trained parts provided with latching hooks and latching openings are clipped together.
• valve stem 11 and the holder 12 show a possibility of a snap connection between the valve stem 11 and the holder 12, which allows the valve stem 11 to be rotated about its axis.
• the end of the valve stem 11 is provided with an angular, conical or rounded annular groove 59 and the insert 54 is provided with two webs resilient due to a slot 51, on which angular, conical or rounded ribs 60 are formed.
• the valve stem is inserted into the bore 57, the insert 54 expanding until the ribs 60 engage in the annular groove 59.
• the connecting element 48 which effects the constriction in the form of a U-shaped hollow bracket is then pushed on and secured by the U-shaped counterpart 53 which is glued or squeezed.
• the constriction forms a bendable connection in FIGS. 40 to 46, in which the axis 15 is realized.
• the enclosing element 4 similar to the embodiment according to FIGS. 34 to 37, consists of a self-contained band made of fabric, spring steel or the like, folded into an open, two-layer loop Reversals in turn form plug openings 47.
• the ends 13 of the open loop are cut out so that they can be inserted into one another in a manner similar to that in FIGS. 18 to 20.
• the holder 12 is composed of two parts 12 ', each of which has a pin-shaped section 48' of the connecting element 48, a receptacle and a threaded sleeve for a threaded screw 61.
• the cam element 2 is not shown as an individually mountable part, but the camshaft is produced in one piece in a conventional method. Since the positive guidance of the valve actuator enables a very light construction of the valve drive, the entire camshaft can also be constructed in a very light construction. This can therefore also be produced in one piece from a possibly reinforced plastic or other lightweight materials.
• a flat fabric strip is used for the enclosing element 4, its ends can either be sewn into a closed loop, glued or welded, or folded over and sewn, glued or welded to form plug-in openings 47 of the open loop.
• the windows 5 or edge and center cutouts 52 can easily be formed in tissue treated in this way.
• valve drive is shown in all versions with a valve tappet as valve actuator 10.
• valve actuator 10 can also include a pivoted rocker arm or rocker arm, at one end of which the wrap-around element 4 is arranged to be pivotable about the axis 15.
• a camshaft for use with internal combustion engines usually has several valve drives of this type, the cam elements waving! are staggered.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Valve Device For Special Equipments (AREA)
• Valve-Gear Or Valve Arrangements (AREA)
• Gears, Cams (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=3683862

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Family Applications After (1)

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• 1999
  • 1999-08-12 AU AU52706/99A patent/AU5270699A/en not_active Abandoned
  • 1999-08-12 WO PCT/AT1999/000198 patent/WO2001012958A1/de not_active Application Discontinuation
  • 1999-08-12 JP JP2001517032A patent/JP2003507616A/ja active Pending
  • 1999-08-12 EP EP99938053A patent/EP1206629A1/de not_active Withdrawn
• 2000
  • 2000-08-08 EP EP00952787A patent/EP1206628A1/de not_active Withdrawn
  • 2000-08-08 AU AU65484/00A patent/AU6548400A/en not_active Abandoned
  • 2000-08-08 WO PCT/AT2000/000215 patent/WO2001012959A1/de not_active Application Discontinuation

Non-Patent Citations (1)

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