US859087A - Hydraulic clutch and change-speed device. - Google Patents

Description

L. M. J. C. LBVAVASSEUR.

' HYDRAULIC. CLUTCH AND CHANGE SPEED DEVICE.

APPLICATION FILED FEB. 14, 1906.

WITNESSES rromvsrs PATENTED JULY 2, 1907.

'2 SHEETS-SHEET 1 Q PATENTBD HEY 2, 190?. L. M. J. a. LEVAVASSEUR. HYDRAULIC c LUTGH AND CHANGE SPEED DEVICE. APPLICATION FILED FEB. 14, 1 9

2 SHEETS-BHEET 2.

Fig. 2

i i 1 1M555 5 LE'ON MARIE JOSEPH CLEMENT LEVAVASSEUR, oFPnTEAoX, FRANCE.

EYDRAULIG CLUTCH AND CHANGE-SPEED Specification of Letters Patent.

ratentd July a, 1907.

Application filed February 14,1906. Serial No. 301.019.

To all whom it may concern:

Be it known that 1, Leo): MARIE Josnrn CLnMENT Lnvavssssue, a citizen of the Republic-of France, and a resident of Puteaux, in said Republic, have invented a new and useful Hydraulic Clutch and Change-Speed Device, of which the following is a specification.

This invention aims to provide a hydraulic-clutch which is very simple in construction and effective in operation.

A further object or the invention is to provide a de vice oi this character by which different speeds may be imparted to the driven member by very simple easilyopeiated means.

It is a further object of the invention to furnish a hydraulic change speed device which is adapted to serve as a differential gear.

In the accompanying drawings, Figure l is a vertical longitudinal section of a. hydraulic clutch and change speed device coiastructed in accordance with the invention, and Fig. 2 shows a development illustrating the disposition of the casing and of the central core carrying the pistons.

Referring to the drawings, and particularly to Fig. l, a denotes the casing of the device, which is preferably of cylindrical iorm, and is secured at one end to either the driving or driven shaft f. The other shaftf is journaled in the casing 11 and passes transversely there through, as shown. Each of the inner surfaces of the side-plates of the casing is provided with a circular series of depressions or pockets 0 which alternate with relists or bosses d of equal volume. The depressions and bosses of one side-plate are arranged instaggered relation to those of the other sideplate, that is to say, the

depressions of one side-plate are opposite the bosses of the other side-plate, and vice versa. The depressions and bosses are provided with inclined sides, as clearly shown in Fig. 2. At its periphery and intermediately between the side-plates the casing is closed, as shown. Communicating with the outer part of each depression 0 is a pipe or conduit 9 which leads to the outer end of the depression of the other side-plate which is in advance of said first-nameddepression. The pipes 9 extend radially from the casing in a series arranged parallel to the axis thereof and extending about the periphery. One of these pipes is provided with a cock h.

Upon the shaft f 1 there is keyed a core b arranged-within the casing a and extending to the periphery thereof, said core completely filling the space in the casing adjacent the shait f and being provided with an outer part which passes freely between the opposing bosses of the side-plates. The core b is provided with a number of radial slots in which are movable, axially of the core, a number of pistons e. These pistons are in the form of blocks which closely fit within the slots of the core and correspond in width'to the space between each boss (I and the inner surface of the opposite depression 0. The 4 casing a is filled with a liquid of any kind, preferably an uncongealable liquid, which fills all the available space.

Supposing the shaft f 1 to be the motor-shaft, when the core b is rotated the pistons will move laterally in their slots alternately to the right and left of the core and enter the depressions and thereby cause the liquid to be. forced in front of the pistons. During this movement of the core the pistons readily pass from the depressions to .the adjacent bosses at the same side thereof by means of the inclined sides of the depressions and bosses over which said pistons ride. The liquid which is forced in front of the pistons finds an outlet through the pipes g, and hence traverses the casing at the same velocity at which the core rotates in the casing, which remains sta tionary. When the core rotates in this manner and the cock h is open, no obstacle is presented to the movement of the liquid and the clutch is disengaged. However,

by progressively closing the cock h the driven shaft f will be rotated bythe motor-shaft at speedsprogressively increasing up to the limit of the speed at which the motor operates, which speed is obtained by completely closing the cock. This variation in the speed of driving is explained by the fact thatthe increasing quantity of liquid which finds no outlet through the conduit in which the cock is arranged, which conduit is partly or wholly closed by the cock, transmits the pressure that it,receives from the pistons to the. casing,

which accordingly begins to rotate. It is apparent that the cock h may be operated by any suitable mechanism.

. When the devices are used as differentials, each of the. wheels is provided with an identical device the casing of which is made solid with the wheel, while the central core is connected with the axle, which in this case acts as a support.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. In a hydraulic clutch and change speed device, the combination, with a casing having alternate depressions and bosses on the inner surfaces of its sidewalls, the depressions and bosses of the side-walls being arranged in staggered relation, means connecting each depression with a depression in the other side-wall, a shaft rotatable in said casing, a core fixed to said shaft,.pistons slidable axially insaid core between the depressions and bosses of the side-walls, a liquid contained in said casing, and means for controlling the passage of the liquid in advance of said pistons.

2. In a hydraulic clutch and change speed device, the combination of a casing having side-walls provided interiorly with alternating series of depressions and bosses, means for connecting the depressions of each side-wall with those of the other wall, a shaft rotatable in said casing, a core carried by said shaft, blocks slidable in radial slots in said core and forming pistons which fit between the'opposlng depressions and bosses of the sidewalls of the casing, a liquid contained in said casing, and means to control the passage f. such liquid in. ad nce or the pistons.

3. In a hydraulic clutch and change speiidldevioe, the

awgww rombinatiou of casing having opposing serie of alter- In testimony whereof I have signed this specification 10 mating depressions and bosses on the inner surfaces of its in the pi side-wniis. p cumin-(King each C1011 rim] with a sill stantially 9p 9 dewv \on of he othu. sidwwall, a stop- LEON MARIE JOSEPH cock in (we of mid pipes, :1 shaft journaied in said casing, CLEMFNT LEV'AVASSEUR. a com mmmtefl on said. shaft :u1d provided with radia slots, pist ms slidabie axially in Witnesses:

and fitting be wc-eu the 90s nus and bosses. EMILE LEDRBT,

and a Daily of liquid cofitained in said wing. HEKXANDO 03 S020.

mm of two subscribing witnessew

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