FR2549156A1 - MACHINE THAT CAN OPERATE AS A MOTOR OR PUMP - Google Patents

Abstract

THE INVENTION RELATES TO A MACHINE THAT CAN OPERATE AS A MOTOR OR A PUMP AND INCLUDING TWO PARTS 1, 2, ONE OF WHICH CAN ROTATE RELATIVE TO THE OTHER AROUND THE SAME AXIS; A CERTAIN NUMBER OF DRIVE GEARS 9, MOUNTED INSIDE ON SHAFTS 5 FIXED ON ONE OF THE SAID PARTS AND ACTIVATED BY A PRESSURIZED FLUID, ARE IN CONNECTION WITH A SERIES OF TEETH 10 PROVIDED ON THE OTHER PART 2 FOR THE TRAIN IN ROTATION.

Description

The present invention relates to a machine capable of operating as a motor.

  or as a pump and capable of controlling the movement of very heavy loads at low speed. There is a hydraulic motor of compact dimensions, designed for example to control the opening and closing of hatches or partitions, or yours to lift platforms supporting heavy loads,

  or for other similar applications.

  The means presently used for such applications are equipment often taking up a lot of space and requiring reducers, gearboxes and other devices, which translate into an increase. These costs, maintenance requirements, risks of 15 breakdowns, etc. On the contrary, the motor according to the invention constitutes a compact unit, having characteristics of

simple construction.

  The motor essentially comprises two parts, one of which is housed inside the other, means being provided between them for controlling the rotation of one of said parts, as will be described below, while the second part can be fixed for example on a supporting structure. Other characteristics and advantages of the invention will be highlighted in the rest of the

  description, given by way of nonlimiting example, in

  reference to the accompanying drawings in which: FIG. 1 is a side view in partial section of an engine 30 according to the invention, FIG. 2 is a section of the engine made in a plane perpendicular to that of FIG. 1, FIG. 3 is a side view in partial section of a particularly compact embodiment of the motor according to the invention, FIG. 4 is a section taken in a plane perpendicular to

that of Figure 3.

  With reference to the attached drawings, the motor according to the invention essentially consists of two parts 1 and 2, the first being housed in the second, the two parts being connected by suitable means so that one part is put in movement relative to the other party.

  In the embodiment shown, the outer part 2 is rotated while the part 1 remains stationary. For this reason, the inner part will hereinafter be appropriately called a "stator" and the outer part a "rotor". .

  The stator 1, mounted on a fixed support 3, has a substantially cylindrical shape and comprises a series of peripheral seats 4 having in section the shape of a sector

  circular, a shaft 5 crossing each of said seats.

  The shafts 5 are mounted, for example by means of bolts 6 or the like, on head walls 7 and 8, fixed at the two ends of the stator 1 by means of screws 18

or the like.

  On each shaft 5 is mounted an idler gear 9 20 having the same dimension as the seat 4, so that the ends of the teeth of the gears 9 apply perfectly in contact with the wall of the seat 4 during rotation The distance between the shafts 5 and the external surface of the stator

  1 is such that, for a certain part of the rotation, the teeth of the gears 9 protrude from the stator 1.

  The inner surface of the rotor 2 is provided with a series of teeth 10, in engagement with the projecting part of the gears 9. The exterior side of the rotor 2 is provided, instead of a thread 11 engaged with a rack or the like, fixed or otherwise connected to the load to be moved,

not shown in the drawings.

  One of the head walls, and precisely that designated by 8, can consist of two coupled parts

  12 and 13; it is thus possible to form two annular chambers 14 and 15.

  From each of said chambers, one or more conduits 16 and 17 are derived, directed towards the outside and connected to a unit (not shown) for admission and ejection.

  of a fluid under pressure Each of the seats 4 of the gears 9 is connected by means of a pair of conduits 19 and 20 respectively with the annular chambers 14 and 15.

  The conduits 19 and 20 start from the opposite ends of each chamber 4, at the height of the surface

rotor 1.

  In the engine, there are also provided suitable sealing elements 21 of a known type, and pipes 22 for collecting the part of the liquid which could leak.

  The operation takes place as follows: pressurized fluid is introduced, for example via the conduit 16, by means of external control devices 15 The fluid arrives in the annular chamber 14 and then, passing through the conduits 19 he arrives at the seats

  4 by putting the gears 9 in rotational movement.

  These gears are engaged with the teeth 10 of the rotor 2, which is consequently driven in rotation. On the part opposite the chambers 4, the fluid is discharged via the conduits 20, the annular chamber 15 and the return conduit 17. During the rotation of the rotor, the thread 11 is engaged with external transmission gears, such as for example a rack or the like, connected to the loads.

  to move, acting on them like a worm.

  It is obvious that, to control the reverse movement, it suffices to circulate the fluid in a direction opposite to that described above.

  Thanks to the thread 11, the motor acts continuously and without interruptions on a rack or the like

  of an appropriate length It emerges from the description given above that with the engine according to the invention one obtains

  the advantages of hydraulic systems by avoiding the stroke limitations which are characteristic of 35-piston devices.

  It is also possible, compared to other systems of known types, to continuously vary the speed of movement to almost zero without having to

provide reducers.

  It appears that the machine described above can also operate as a pump, if it receives a

mechanical rotational movement.

  We have described above a particular embodiment of the invention where it is the external part of the

motor which is set in motion.

  It is however possible, if necessary, to block the external part on a fixed structure; in this case, the inner part turns.

  If the loads to be moved are not excessively heavy, a particularly compact version of the motor can be used as shown in FIGS. 3 and 4, relating to applications with mobile concrete mixers. In this case the stator 1 is mounted on fixed supports 3 while the heads -7 and 8 are made in one piece and support a large number of engaging toothed wheels.

  in a plurality of grooves 23, oriented radially, and ending at one end in a central common pipe 24 and at the other end in each of the seats 4.

  Near the opposite head, an identical number of radial conduits 25 are provided, also connected to a common central pipe 26 and each terminating in one of the

  seats 4, on the opposite side to that where the pipes 23 end.

  The pipes 24 and 26 are connected to hydraulic devices of known type, having the function of sending

  pressurized fluid in chambers 4.

  The unit described above is housed in a box 27, mounted on the head walls 7 and 8 by means of bearings 28 or the like The rotor 2 is provided on the outside with several teeth 29 which are applied against the corresponding seats provided inside the box 27, ensuring

the rotation of the latter.

  The box 27 is also connected, by means of bolts 30 or the like, to the tank of a mobile concrete mixer. A central pipe 31 starting from the zone between the engine and the outer casing 27, leads to a tank, not shown, for collecting the oil which could leak through the sealing elements placed between the

  rotor and head walls 7 and 8.

  The operation takes place in the following way: the engine is fixed on a bearing structure in the case considered on the chassis of a mobile concrete mixer

  and it is connected to its hydraulic devices.

  The pressurized oil sent to the pipe 24 passes through the branches 23, it reaches the chambers 4 and sets in gear the toothed wheels; these make

  turn the inner teeth 10 of the rotor 2.

  On the opposite side, the oil is discharged via the lines 25 and 26.

  On the rotor 2 is mounted the box 27 and, because it is fixed by bolts 30 on the tank of the mobile concrete mixer, the latter is therefore

kept in motion.

  The pressurized oil possibly leaking from the chambers 4 along the contact zone between the rotor and the head walls 7 and 8 is received inside the casing 27 and it is then collected via the pipes 31 A subject matter expert can consider many changes and variations all coming in however

  in the context of the present invention.

Claims (5)

  1 machine capable of operating as a motor or a pump, characterized in that it comprises a plurality of gears (9) mounted idly on stationary shafts (5), fixed to one of the parts constituting the motor and actuated by a fluid under pressure , a series of teeth (10) engaged with said gears (9) being provided on the remaining part. 2 Machine capable of operating as a motor or a pump, characterized in that it comprises a substantially cylindrical body (1) provided with a plurality of peripheral seats (4) for a corresponding number of gears (9) mounted idly on shafts stationary (5) fixed on said cylindrical body, and a second body (2), placed outside 15 of the first and having a series of teeth (10) cooperating with said gears (9), hydraulic means being provided for their actuation.   3 Machine according to one of the preceding claims,   characterized in that the outer part (2) is rotatable 20 and is provided with a thread (11) cooperating with a means   external for moving the load.   4 Machine according to one of the preceding claims,   characterized in that there is provided, in at least one of the heads, a pair of annular chambers (15) from which are derived pipes leading to the gear seats (4),   one of said annular chambers (15) being connected to a pressurized fluid inlet conduit while the other is connected to a fluid discharge conduit.   Machine according to claim 1, characterized in that the head walls (7 and 8) are made in one piece and in that there is provided in each of them fluid intake ducts, comprising a pipe common central (24) from which substantially radial conduits are derived   leading to each of the rooms (4).   6 Machine according to one of the preceding claims,   characterized in that the rotor-stator assembly is enclosed in a container for collecting the flowing oil outside the rooms (4).   7 machine according to claim 6, characterized   in that it comprises suitable means for connecting said box (27) to external means to be put into rotational movement.