GB2284450A - Radial piston engine having a mechanical brake assembly - Google Patents
Radial piston engine having a mechanical brake assembly Download PDFInfo
- Publication number
- GB2284450A GB2284450A GB9502854A GB9502854A GB2284450A GB 2284450 A GB2284450 A GB 2284450A GB 9502854 A GB9502854 A GB 9502854A GB 9502854 A GB9502854 A GB 9502854A GB 2284450 A GB2284450 A GB 2284450A
- Authority
- GB
- United Kingdom
- Prior art keywords
- radial piston
- brake
- piston engine
- brake assembly
- rotor
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
- F04C15/0084—Brakes, braking assemblies
-
- 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
- F03C1/0447—Controlling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D55/24—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member
- F16D55/26—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member without self-tightening action
- F16D55/36—Brakes with a plurality of rotating discs all lying side by side
- F16D55/40—Brakes with a plurality of rotating discs all lying side by side actuated by a fluid-pressure device arranged in or one the brake
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D59/00—Self-acting brakes, e.g. coming into operation at a predetermined speed
- F16D59/02—Self-acting brakes, e.g. coming into operation at a predetermined speed spring-loaded and adapted to be released by mechanical, fluid, or electromagnetic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D2055/0004—Parts or details of disc brakes
- F16D2055/0058—Fully lined, i.e. braking surface extending over the entire disc circumference
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2127/00—Auxiliary mechanisms
- F16D2127/02—Release mechanisms
- F16D2127/04—Release mechanisms for manual operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/3023—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure
- F16H63/3026—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure comprising friction clutches or brakes
- F16H2063/3033—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure comprising friction clutches or brakes the brake is actuated by springs and released by a fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/38—Control of exclusively fluid gearing
- F16H61/40—Control of exclusively fluid gearing hydrostatic
- F16H61/4157—Control of braking, e.g. preventing pump over-speeding when motor acts as a pump
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Hydraulic Motors (AREA)
Abstract
A radial piston motor for operation with a mechanical brake assembly. For the release of the brake assembly leakage pressure medium is derived from the radial piston motor itself and is directed to the brake assembly. The pressure medium reaches a gap 41 through an internal leakage path shown by an arrow 83. Preferably a brake chamber 35 is connected via a valve 81 to the main pressure medium tank, the valve being adjusted to the brake release pressure. <IMAGE>
Description
BAEIAl < 9 TON ENG RAVING A HEkXAWICAL KAX ASSEMBLY The present invention relates to radial piston engine, and preferably tc a radial piston motor.
More specifically, the present invention relates to a radial piston motor which can be operated as a pump for the purposes of braking. Moreover, said radial piston motor may be equipped with a mechanical brake assembly which, for instance, is adapted to brake the shaft of the radial piston motor if no hydraulic pressure is available. More specifically, the present invention relates to a radial piston motor used for driving a construction vehicle, for instance, a levelling roller. In this instance, the hydraulic piston motor is arranged in a closed circuit together with n main pump as well as a booster pump.
Many typos of radial piston engines are known. Such engines are frequently used together with a mechanical brake assembly, typically a brake assembly of the lamella or disc type.
Frequently, the brake discs are forced against each other by means of a spring, such that the brake is in its applied condition, when no pressure medium is supplied to the brake assembly. P*or the release of the brake assembly pressure medium, preferably hydraulic oil, is supplied to a brake chamber with the consequence, that a brake piston is moved and acts against the force of said spring so as to release the brake assembly.
The present invention specifically relates to a radial piston engine used together with such a brake assembly.
When using a radial piston motor together with a mechanical brake assembly and a hydraulic main pump together with a booster pump for operating said radial piston motor, then the pressure medium required for the release of the brake is frequently taken from the booster pump and supplied to the brake chamber. An inner seal ring ts generally required in such a case between the brake chamber and the radial piston motor. However, such a design is disadvantageous insofar as due to the existing dynamic forces leakages may occur.
It is an object of the present invention to design a radial piston engine, specifically a radial piston motor operated together with a mechanical brake assembly, such that the disadvantages of the prior art are avoided. Also, the radial piston motor and its brake assembly should be of a simple and low cost design providing high operating security.
According to the present invention there is provided a radial piston engine having a mechanical brake assembly and operated together with a pump assembly comprising a main pump and a booster pump, said radial piston engine comprising, a motor housing; at least two ports (A, B) formed in said motor housing for a pressure medium; a shaft rotatably mounted in said housing; a rotor fixedly mounted to said shaft; pistons arranged in radial bores in said rotor; a stationary cam path for cooperation with rollers carried by said pistons; a commutator fixedly mounted in said housing and adapted to connect/separate said ports (A, B) to/from said radial bores depending on the position of said rotor; characterised in that said mechanical brake assembly is adapted to be actuated by the leakage pressure medium derived from said motor housing through channel means located in said motor housing, and the pressure medium used for the actuation of the brake is taken from a location radially inward with respect to the connecting area between the rotor and the commutator.
In the radially inner area of the radial piston engine, located between the rotor and the commutator, leakage oil exists adjacent to the shaft supporting the rotor and flows -in a direction towards the inside. This leakage oil is used, after a certain pressure has built up, for actuating, specifically for releasing, the brake assembly. Preferably this leakage oil is guided to the brake assembly along an annular gap extending between the shaft and the chamber. There the leakage oil is supplied to the brake chamber. Preferably the brake chamber is connected via a valve to the tank, the valve being adjusted to the brake release pressure.
The invention is illustrated, by way of example only, in the accompanying drawings of which:
Fig. 1 shows schematically the operation of a radial piston
motor in accordance with the invention.
Fig. 2 is a longitudinal sectional view of a radial piston
motor with a brake assembly connected thereto,
exemplifying the invention, and
Fig. 3 is a longitudinal sectional view of a hydraulic motor
with a brake assembly being enclosed by the motor
housing.
In the following description reference will be made to a radial piston motor. However, this term should be interpreted more generally also as a radial piston engine, particularly in view of the fact that the radial piston motor does operate as a radial piston pump for the purposes of hydraulic braking.
Fig. 1 shows schematically the method of providing the pressure medium with a sufficient pressure as it is required for the actuation of a brake assembly 30. The dotted line 77 in Fig.
1 shows that leakage oil exiting from a motor 100 is guided or supplied to a brake chamber 35 of the brake assembly 30 by means of a channel 78. A connecting point 79 of lines 77 and 78 is connected via a line 80 to a pressure relief valve 81 which is adjusted to the brake relief pressure. After a respective pressure build-up has taken place in the braking chamber 35, the brake assembly is released.
Fig. 2 shows a practical embodiment of the invention illustr ated schematically in Figure 1. A longitudinal sectional view of a radial piston engine 102 which is of similar design to that shown in GB-A-2 252 799. The leakage oil in the engine flowing out of an area 82 is guided or supplied to the braking chamber 35. This is done by means of a gap 83. The oil flows initially in the direction indicated by the arrow, also referenced by the numeral 83, and thereafter along the path referenced by the arrow 84. A pressure relief valve 81 connected to the braking chamber 35 serves for the adjustment of the brake release pressure.
Fig. 3 is a longitudinal sectional view of a radial piston engine 103 which differs from the radial piston engine 101 insofar as the the brake assembly 130 is integrated into a housing half 2. Again, for this embodiment leakage oil from an area corresponding to the area 82 in Fig. 2 is guided to a braking chamber 135. This occurs along a gap 141. The gap 141 is connected on the one hand to the brake chamber 135 and on the other side to the area where the leakage oil is generated. This leakage oil has again an increased pressure which can be used for the release of the brake. Arrow 132 indicates the leakage oil flow towards the gap 141.
Claims (6)
1. A radial piston engine having a mechanical brake assembly and operated together with a pump assembly comprising a main pump and a booster pump, said radial piston engine comprising,
a motor housing;
at least two ports (A, B) formed in said motor housing for a pressure medium;
a shaft rotatably mounted in said housing;
a rotor fixedly mounted to said shaft;
pistons arranged in radial bores in said rotor;
a stationary cam path for cooperation with rollers carried by said pistons;
a commutator fixedly mounted in said housing and adapted to connect/separate said ports (A, B) to/from said radial bores depending on the position of said rotor;;
characterised in that said mechanical brake assembly is adapted to be actuated by the leakage pressure medium derived from said motor housing through channel means located in said motor housing, and the pressure medium used for the actuation of the brake is taken from a location radially inward with respect to the connecting area between the rotor and the commutator.
2. The radial piston engine of claim 1, characterised in that the leakage pressure medium is guided to the brake assembly along an annular gap extending between the shaft and the chamber.
3. The radial piston engine of claim 2, characterised in that said annular gap extends from said rotor to the axial end of said radial piston engine where said brake assembly is located.
4. The radial piston engine of any of the preceding claims, characterised in that the brake chamber is connected via a valve to the tank, the valve being adjusted to the brake release pressure.
5. The radial piston engine of any of te preceding claims, characterised in that a pressure relief valve is provided for the adjustment of the brake relief pressure for the brake chamber.
6. Radial piston engines as herein described with reference to, and as shown in the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19914104712 DE4104712C2 (en) | 1991-02-15 | 1991-02-15 | Radial piston machine with mechanical braking device |
| GB9203231A GB2252799B (en) | 1991-02-15 | 1992-02-14 | Radial piston engine having a mechanical brake assembly |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9502854D0 GB9502854D0 (en) | 1995-04-05 |
| GB2284450A true GB2284450A (en) | 1995-06-07 |
| GB2284450B GB2284450B (en) | 1995-08-16 |
Family
ID=25901080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9502854A Expired - Fee Related GB2284450B (en) | 1991-02-15 | 1992-02-14 | Radial piston engine having a mechanical brake assembly |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2284450B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1079133A2 (en) * | 1999-08-25 | 2001-02-28 | Eaton Corporation | External manual brake release |
| WO2007031084A1 (en) * | 2005-09-13 | 2007-03-22 | Sauer-Danfoss Aps | Hydraulic machine |
| EP4006372A1 (en) * | 2020-11-30 | 2022-06-01 | Robert Bosch GmbH | Radial piston machine with brake |
-
1992
- 1992-02-14 GB GB9502854A patent/GB2284450B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1079133A2 (en) * | 1999-08-25 | 2001-02-28 | Eaton Corporation | External manual brake release |
| EP1079133A3 (en) * | 1999-08-25 | 2003-04-09 | Eaton Corporation | External manual brake release |
| WO2007031084A1 (en) * | 2005-09-13 | 2007-03-22 | Sauer-Danfoss Aps | Hydraulic machine |
| EP4006372A1 (en) * | 2020-11-30 | 2022-06-01 | Robert Bosch GmbH | Radial piston machine with brake |
| US20220170460A1 (en) * | 2020-11-30 | 2022-06-02 | Robert Bosch Gmbh | Radial Piston Machine with Brake |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2284450B (en) | 1995-08-16 |
| GB9502854D0 (en) | 1995-04-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960214 |