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WO1987005972A1 - Moteur a piston, en particulier moteur a piston radial - Google Patents

Moteur a piston, en particulier moteur a piston radial Download PDF

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Publication number
WO1987005972A1
WO1987005972A1 PCT/EP1987/000160 EP8700160W WO8705972A1 WO 1987005972 A1 WO1987005972 A1 WO 1987005972A1 EP 8700160 W EP8700160 W EP 8700160W WO 8705972 A1 WO8705972 A1 WO 8705972A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
piston engine
control pin
ring
bearing bush
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP1987/000160
Other languages
German (de)
English (en)
Inventor
Klaus Weckbrodt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of WO1987005972A1 publication Critical patent/WO1987005972A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0435—Particularities relating to the distribution members
    • F03C1/0438—Particularities relating to the distribution members to cylindrical distribution members

Definitions

  • Piston engine especially radial piston engine
  • the invention relates to a piston engine, with a housing, with adjustable pistons in the housing and with an output shaft mounted in the housing, which has a second bearing point designed as a control pin with control grooves and connecting lines, the control pin being mounted in a bearing bush which is inserted into 'the housing and surrounded by it.
  • Piston engines which are generally operated with oil, should have the same speed, if possible, in the cold and in the warm state, with the same absorption volume. This means that inevitably occurring leakage oil should be the same in the cold and in the warm state. However, this requirement cannot be met, or can only be, in the known piston engines. realize conditionally. If the control pin is stored in a bearing bush made of gray cast iron, there is a risk that it will jam at high temperatures. In addition, a bearing bush made of this material cannot be subjected to particularly high loads because of its relatively poor bearing properties. The same applies to a steel bearing bush. If the control pin is stored in a bearing bush made of aluminum, jamming can occur in the cold state.
  • control pin In order to be able to maintain a suitable material pairing between the control pin and the bearing bush and thus the same control play both in the cold and in the warm state, it has also been proposed to design the control pin as a separate part and to fasten it to the drive shaft .
  • such a construction is relatively complex and expensive.
  • the present invention is therefore based on the object of providing a piston engine of the type mentioned at the outset which, with the same absorption volume, has the same speed as possible at different temperature ranges, which is to be achieved with simple means.
  • the bearing bush consists of a plain bearing material and that the bearing bush is surrounded by a gray cast iron or steel ring, the ring being dimensioned in such a way that the thermal expansion of the ring and bearing bush together at least approximately so is as large as the thermal expansion of the control pin.
  • the combination or assignment of the individual parts and materials according to the invention means that, according to the invention, the gap sizes between the control boxes and control grooves in the control pin and the bearing bush can be kept almost the same at different temperatures.
  • a plain bearing material generally expands considerably more at higher temperatures than, for example, gray cast iron or steel, from which the control pin generally consists, but because the bearing bush is surrounded by the gray cast iron or steel ring, the bearing bush becomes closed at one strong expansion prevented.
  • the ring practically forms a firm corset around the bearing bush.
  • the gray cast iron or steel ring forms part of the housing.
  • the ring consists of the same material as the housing and is produced in a simple manner with this as a unit.
  • a reduction in the diameter of the housing can be achieved in various ways. For example, a step-like step in the housing is possible. Likewise, the extensibility of the ring can be improved by bores, pockets, recesses, indentations or the like running in the area of the control pin at least approximately axially parallel to the longitudinal axis of the control pin and distributed over the circumference of the housing. be formed.
  • the holes, pockets, and the like. off the ceiling! side end of the housing be introduced.
  • Al s plain bearing material for the bearing bush is, for example, aluminum or an aluminum! very suitable.
  • the ring and the housing will advantageously be made of gray cast iron, because this material is also very suitable for forming the cylinder walls for the radial pistons, as a result of which separate cylinders can be omitted.
  • the bearing bush also forms the cover for the housing and for the control pin.
  • the bearing bush fulfills two functions.
  • Fig. 1 a longitudinal section through a radial piston engine according to the invention
  • the radial piston motor according to the invention is fundamentally of a known type, which is why only the parts that are essential for the invention are discussed in more detail below.
  • the eccentric shaft 3 has a housing 1 with a cover 2.
  • An eccentric shaft 3 with an eccentric 4 is mounted in the housing 1 and the cover 2.
  • the eccentric shaft 3 has on one side an output pin 5 which is mounted in a roller bearing 6.
  • the second bearing which is designed as a slide bearing, because this " bearing is also designed as a control pin 7 for controlling the pressure medium, generally oil.
  • the slide bearing surrounds the control pin 7 as a bearing bushing 13, the bearing bushing 13 also simultaneously forming or being integral with the cover 2.
  • the cover 2 is connected to the housing 1 by a plurality of screws distributed over the circumference.
  • pistons 8 which are evenly distributed in corresponding bores of the housing and are displaceable in the radial direction over the circumference of the housing 1.
  • the upper piston is shown in FIG. 1 shortly before its piston chamber is provided with oil via a pressure line 9 ' for generating a working stroke.
  • the piston chambers are each sealed to the outside by screw cap 15.
  • An oil outlet line 10 is located in the lower region of the housing 1.
  • a second outlet line 10A can optionally be provided.
  • a connecting bore in the form of an oblique bore 16 leads from the annular groove 12 to a segment-like pressure supply groove 14 for supplying oil to the respective piston chambers.
  • a segment-like disposal groove for the piston spaces, the pressure supply groove 14 and the disposal groove being separated from one another by a web.
  • an inclined bore leads to a further circumferential groove 17, from which a line (also not shown) leads to the outlet opening 10 and possibly to the outlet opening 10A.
  • the connection between the pressure supply groove 14 and the respective pressure line 9 for each radial piston 8 produces a radial bore 18 in the bearing bush 13.
  • the bearing bush 13 consists of aluminum vacuum casting as a sliding bearing material.
  • the drive shaft 3 with the control pin 7 is made of steel and the housing 1 is made of gray cast iron.
  • the bearing bush 13 surrounds a ring 19 which is integral with the housing 1.
  • the ring has a significantly smaller diameter than the area of the housing 1 in which the radial pistons 8 are mounted. This is achieved by means of a step-shaped shoulder 20.
  • the outside and inside diameters of the ring 19 and also the outside and inside diameters of the bearing bush 13 are matched to one another in such a way that, when the temperature rises, they together receive a thermal expansion which corresponds at least approximately to the thermal expansion of the control pin 7. Since the bearing bush 13 wants to expand much more, the ring 19 acts as a corset or like a tension ring, but the ring 19 must be dimensioned so that it "breathes" to a small extent so that the desired same heat ⁇ ⁇
  • the housing 1 is correspondingly weakened in the area of the control pin 7.
  • the weakening of the housing in this area can also be achieved by other measures.
  • the housing 1 also has at least approximately its original diameter in the area of the control pin.
  • a large number of blind bores 21 are made from the end face on the cover side and distributed over the circumference.
  • the blind bores extend at least approximately over the entire length of the control pin.
  • the -S-bores 21 and the original housing diameter are indicated by dashed lines.
  • recesses, recesses 22 or the like can of course also be provided, as shown in dashed lines in FIG. 3 at the top right.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Le moteur à piston radial décrit est pourvu d'un carter (1) renfermant des pistons mobiles (8) et un arbre d'entraînement (3) supporté sur un palier. L'arbre d'entraînement comporte un second palier se présentant sous la forme d'un maneton de commande (7) doté de rainures de commande et de passages de raccordement. Le maneton de commande (7) est supporté dans un coussinet (13) logé dans le carter (1) et entouré par ce dernier. Le coussinet (13) est constitué d'un matériau pour palier lisse et est entouré d'une bague (19) en fonte grise ou en acier. Cette bague (19) est dimensionnée de telle manière que la dilatation thermique combinée de la bague (19) et du coussinet (13) soit au moins approximativement aussi importante que la dilatation thermique du maneton de commande (7).
PCT/EP1987/000160 1986-03-27 1987-03-20 Moteur a piston, en particulier moteur a piston radial Ceased WO1987005972A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LUPCT/EP86/00184 1986-03-27
EP8600184 1986-03-27

Publications (1)

Publication Number Publication Date
WO1987005972A1 true WO1987005972A1 (fr) 1987-10-08

Family

ID=8165107

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1987/000160 Ceased WO1987005972A1 (fr) 1986-03-27 1987-03-20 Moteur a piston, en particulier moteur a piston radial

Country Status (2)

Country Link
DE (1) DE3709389A1 (fr)
WO (1) WO1987005972A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3716163A1 (de) * 1986-05-22 1987-11-26 Zahnradfabrik Friedrichshafen Kolbenmotor, insbesondere radialkolbenmotor
DE3814269A1 (de) * 1988-04-27 1989-11-09 Maier Max Kolbenmaschine
FR2881173A1 (fr) * 2005-01-27 2006-07-28 Ericab Sarl Machine tournante volumetrique
DE102008043429A1 (de) * 2008-11-04 2010-05-06 Robert Bosch Gmbh Nockenwellentrieb mit gegen axiales Rutschen optimierten Lagerbuchsen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1989117A (en) * 1930-02-24 1935-01-29 Ernest J Svenson Plunger pump
US3046950A (en) * 1958-01-22 1962-07-31 Whiting Corp Constant mechanical advantage rotary hydraulic device
FR1412447A (fr) * 1964-06-24 1965-10-01 Chamberlain Ind Ltd Perfectionnements aux moteurs hydrauliques
US3730054A (en) * 1971-06-02 1973-05-01 Fmc Corp Air motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1989117A (en) * 1930-02-24 1935-01-29 Ernest J Svenson Plunger pump
US3046950A (en) * 1958-01-22 1962-07-31 Whiting Corp Constant mechanical advantage rotary hydraulic device
FR1412447A (fr) * 1964-06-24 1965-10-01 Chamberlain Ind Ltd Perfectionnements aux moteurs hydrauliques
US3730054A (en) * 1971-06-02 1973-05-01 Fmc Corp Air motor

Also Published As

Publication number Publication date
DE3709389A1 (de) 1987-10-01

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