Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B71/00—Free-piston engines; Engines without rotary main shaft
  • F02B71/02—Starting
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B75/00—Other engines
  • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N11/00—Starting of engines by means of electric motors

Definitions

• the invention relates to a starter for a motor having a free-flying stepped piston, comprising a rotatable about an axis
• Eccentric element via which a translational movement can be transmitted to the step piston.
• a motor with a free-floating stepped piston can be found in DE-A-30 29 287.
• This motor known as the "Stelzer” motor, has a simple design and consists of only a few individual parts. Therefore, a universal application is possible, whereby the force gained during the combustion can be directly implemented in work by the piston stages.
• the stepped piston can be axially pierced to allow e.g. to pump a liquid.
• the object of the present invention is to provide a starter as described in the introduction
• Step piston can be set to the desired frequency without the risk of damage or tearing of interlocking parts. Also supposed to be easy decoupling of starter and stepped piston may be possible.
• the eccentric element has at least two transmission elements which can be changed in length to the required extent and which are connected on opposite sides of the axis either to a slide element which can be moved back and forth along the stepped piston, which in turn indirectly or directly with is connected to the step piston, or bypassing the slide element, act on sections of the step piston to impress a reciprocating movement.
• the transmission element is an element which yields to a degree, by means of which the change in distance which occurs as a function of the position of the eccentric element can be compensated for between the connection points of the transmission element on the eccentric element and the sliding element or stepped piston sections.
• the transmission element is preferably a belt such as steel-reinforced belts.
• the e.g. Transfer elements designed as belt elements transmit a rotational movement transmitted by an eccentric element such as an eccentric disk or 20 disks to a slide which can only be moved back and forth along the step piston.
• an eccentric element such as an eccentric disk or 20 disks
• the slide is fixed by means of bearing blocks running parallel to the longitudinal axis of the stepped piston and can therefore only be moved back and forth along this.
• the eccentric disc can be arranged on a shaft which in turn starts eccentrically from a disc which can be set in rotation by means of, for example, a V-belt or by means of a positive connection by means of, for example, an electric starter.
• the disc which is rotated by the starter with the shaft emanating from it, from which in turn the discs guiding the transmission elements originate, can therefore be referred to as a crank mechanism in order to convert the rotational movement into a translational movement by means of the slide which can only be moved axially along the stepped piston which in turn is transferable to the stepped piston.
• the transmission elements such as belts have, for example, elasticity due to elasticity, so that despite the eccentric movement of the shaft having the disks and the resulting change in distance to the points of the slide, in which the transmission elements effectively engage the slide, destruction does not occur .
• transmission elements are preferably steel-reinforced belts, ropes or similar elements can also be used.
• the interaction between the slide element and the stepped piston takes place via pistons, preferably pressurized with pressure medium, which start from the slide element and which, for example, Transfer the translational movement of the slide element via elements starting from the step piston.
• the pistons preferably assume a common pressure space, which e.g. can be acted upon with hydraulic oil. As a result, the pistons are moved outwards in the direction of the elements extending from the stepped piston in order to abut against them.
• the pistons extending from the slide element are retractable. So that the decoupling takes place as quickly as possible, the surrounding coil springs can act on the pistons. Further details, advantages and features of the invention result not only from the claims, the features to be extracted from them - individually and / or in combination - but also from the following description of preferred embodiments to be taken from the drawing.
• FIG. 1 shows a sectional illustration of a free-flight piston engine with a first embodiment of a starter
• FIG. 2 is a plan view of the starter of FIG. 1,
• FIG. 3 shows a sectional illustration through a free-flight piston engine with a further embodiment of a starter
• Fig. 4 is a perspective view of a preferred embodiment of a starter
• FIG. 5 is a perspective view, partly in section, of essential elements of the starter according to FIG. 4.
• the motor (10) has a stepped piston (14) arranged in a motor housing (12) with outer piston steps (16) and (18) and an inner step (20).
• the inner step (20) can be moved within a pre-compression chamber (22), from which the pre-compressed fuel mixture flows via channels (24) and (26) in combustion chambers (28) and (30).
• Pre-compressor rooms (22) and combustion chambers (28) and (30) could of course be replaced.
• the piston center pieces (30) and (32) extending in the channels (24) and (26) also have the function of a valve.
• the invention provides that sections (36) and (38) extend from the outer piston stages (16) and (18), which are connected via transmission elements (40) and (42) with a pin ( 44) are connected, which is eccentrically and rotatably mounted in its own rotatably mounted shafts, which can be designed as cylinder sections (46) and (48).
• the pin (44) with the cylinder sections (46) and (48) consequently represents a type of crank drive, which in turn can be set in rotation by a starter motor, not shown.
• the transmission elements (40) and (42) are connected to the sections (36) and (38) via cylindrical elements (50) and (52) extending from them.
• crank mechanism (44), (46), (48) is now set in rotation, this movement is converted into a translational movement, as a result of which the stepped piston (14) is set in vibration.
• the translational movement is of course only transmitted from the transmission element (40) or (42) to the stepped piston (14), to which a tensile force acts by means of the pin (44).
• the former are designed to a certain extent to be elastic. Therefore, steel reinforced belts are particularly suitable. Ropes or the like are of course also possible.
• the transmission elements (40) and (42) can also be rigid.
• the sections (50) and (52) or the sections (36) and (38) extending directly from the outer piston stages (16) and (18) must be elastic to a certain extent.
• the latter can preferably be spring bars.
• crank mechanism consisting of the pin (44) and the cylinder sections (46), (48) sets a carriage (54) in translational motion, which carries hydraulically or pneumatically actuated cylinders (56) and (58), their pistons (60) and (62) interact with the sections (36) and (38) of the outer piston stages (16) and (18).
• the pistons (60) and (62) are extended, ie they rest on the inner surfaces of the sections (36) and (38). If the crank mechanism (44), (46) and (48) is now set in rotation, the slide (54) is set in a back and forth movement parallel to the longitudinal axis of the stepped piston (14), which moves on the stepped piston (14) is transmitted itself. This will start the engine. The starter can then be decoupled by pulling back the pistons (60) and (62) so that the stepped piston (14) is exposed.
• cranks (46) and (48) could of course be used to tap the work obtained by the combustion. In other words, this translates into a rotational movement of the stepped piston (14).
• FIGS. 4 and 5 show a particularly noteworthy embodiment of a starter designed according to the invention for a free-flight piston engine, which can likewise have a basic structure like the Stelzer engine.
• Bearing blocks (70) and (72) are arranged on sections (66) and (68) of the motor and parallel to the indicated step piston (14), along which a carriage (74) can be moved back and forth.
• the slide has a cylindrical base or base body (76), from which the bearing blocks (70) and (72) surround bearing eyes (78) and (80).
• a drive unit (82) is arranged that cannot be moved, by means of which a rotational movement is converted into a linear movement to be carried out by the carriage (74), which in turn is transmitted to the stepped piston (14).
• the drive unit (82) also starts from an engine block section (84) and is penetrated by the bearing blocks (70) and (72).
• the drive unit (82) has a disk (88) which can be rotated by means of an electric starter (84) via a V-belt (86) and which can be rotated about an axis (90).
• Eccentrically to this ends a shaft (92) which carries disc elements (94) and (96), of which transmission elements in the form of preferably flexible steel-reinforced belts (98) and (100) run out, which are guided around disc elements (102) and (104).
• the disk elements (102) and (104) start from sections (106) and (108) of the carriage (74).
• the disk elements (102) and (104) practically wobble as a function of the position of the eccentric element (92), (94) and (96).
• the flexible connecting elements (98) and (100) do not rotate. They are guided by the disk elements (94) and (104) or (96) and (102).
• the disk elements (94), (96) can be rotated with respect to the stub shaft (92), ie the stub shaft rotates with respect to the disk elements (94) and (96) so that they remain in their position.
• the disk elements (94) and (96) which are mounted eccentrically with respect to the disk element (88) can be displaced relative to the deflection disks (102) and (104), the distance from the position of the disk element (88) being variable.
• This change in length is compensated for by the transmission elements (98) and (100) themselves.
• they are designed to be elastic to such an extent that the change in distance can be compensated for without the risk of destruction.
• the pistons (110) and (112) can be displaced outward from the base body (76) in the direction of the sections (114) and (116). This is made possible by the fact that the pistons (110) and (112) start from a pressure chamber (118) which can be acted upon by a pressure medium such as hydraulic oil via a line (120).
• stroke limits are provided which are slit through the lengthways extending in the pistons (110) and (112) or longitudinal channels (122) are formed, into which bolts or screws (124) extending from the slide (74), preferably from the base body (76), engage.
• the pistons (110) and (112) are surrounded by spring elements such as coil springs (126) and (128), which act as a force produce against the force caused by the pressure medium.
• spring elements such as coil springs (126) and (128), which act as a force produce against the force caused by the pressure medium.
• the pressure medium can be pressed out of the pressure chamber (118) accelerated, provided that the pressure medium itself is no longer pressurized. This in turn leads to a rapid retraction of the pistons (110) and (112).
• the sections (106) and (106) of the carriage (74) receiving the deflection disks (102) and (104) are e.g. Allen screws (130) can be moved.
• sections (114) and (116) transmitting the translational movement of the carriage (74) to the stepped piston (14) preferably originate from the end faces of the outer steps of the stepped piston (14), it is of course possible to use the pistons (110) and ( 112) interacting sections also start from side surfaces of the stepped piston (14). Other types of linear motion transmission from the carriage (74) to the stepped piston (14) are also conceivable.
• the transmission elements do not necessarily have to be belts, which, however, lead to an almost noiseless mode of operation, but can also be other flat elements.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Transmission Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6382381

Family Applications (1)

Country Status (3)

Cited By (1)

Citations (3)

• 1989
  • 1989-06-08 DE DE19893918786 patent/DE3918786A1/de not_active Withdrawn
• 1990
  • 1990-05-31 WO PCT/EP1990/000867 patent/WO1990015231A1/de active Application Filing
  • 1990-05-31 AU AU56705/90A patent/AU5670590A/en not_active Abandoned
  • 1990-05-31 DE DE19904090967 patent/DE4090967D2/de not_active Expired - Lifetime

Patent Citations (3)

Also Published As

Similar Documents

Legal Events