US1118053A - Fluid-pressure motor. - Google Patents

Description

M. H. ROBERTS.

FLUID Pm:

APPLICATION FILED MAY 3, 1912.

SSURE MOTOR.

Patented Nov. 24, 1914.

WITNES MONTAGUE H. ROBERTS, O13 PBOVIDENCE. RHODE ISLAND.

FLUID-PRESSURE MOTQR.

Application filed'May 3, 1912.

ited to such type, and its object is to pro;

vide a valve mechanism therefor, which shall be of simple and inexpensi e construction, and which, in operation, shall be exempt from unbalanced pressure and thrust, and be capable of either manual or auto- .matic control for the functions of varying the point of cut-off or reversal of direction of rotation of the motor, or of acting as a brake.

The improvement claimed is hereinafter fully set forth. In the accompanying drawings: Figure 1 is a vertical transverse central section through a fluid pressure motor, illustrating an embodiment of my invention; Figs. 2 and 3., horizontal sections through the same, on the lines a a and Z; Z), respectively of Figl 1;Fip; 4, a view, in perspective, of the throttle sleeve; and Fig. 5, a similar view of the inlet valve.

My invention is herein exemplified in an internahcombustion engine, which except as to the features of my invention as hereinafter described, is of the ordinary construction, comprising a cylinder, 1, located above and secured to a closed crank case, 2, in which is j'ournaled a crank shaft, 3, carrying a crank, 3, the crank pin, 3?, of which is coupled, by a connecting rod, 4:, to a piston, 5, reciprocating in the cylinder, 1.

The cylinder is closed at top by a head, 6,

having a water jacket, 6*, to which, and to a water jacket, 1 surrounding the cylinder, water is supplied through a'pipe, 6", The engine is fitted with other accessories which are common to motors of this type, and which, as they do not relate to my present invention, will not be herein described.

In the practice of my invention, the cylinder, 1, is reduced in diameter at and adjacent to its lower end, and a cut off valve, 7, which I herein designate as a throttle sleeve, and which is in the form of an open ended tubular member, finished truly on its outer and inner surfaces, is fitted to recipro- Specification of Letters Patent.

Patented Nov. 24, 1914;.

Serial No. 84,840.

cate within the cylinder. on the. reduced diameter portion of w ich it has its lower and outer hearing, and, at and adjacent to its upper end, it has its upper and inner hearing on the periphery of the inwardly projectingportion of the cylinder head, 6. An inlet port, '7, and an opposite exhaust port, 7, are formed in the throttle sleeve, said port's being located in position to be brought into register, respectively, with an inlet port, 8, and an exhaust port, 9, on opposi tt sides of. is cylinder. A lug, 7, is formed on or fixed to the lower end of the throttle sleeve, for the connection of operating mechanism hereinafter described.

The admission and exhaust of motive fluid to and from the cylinder, 1, above the piston, 5, are efiected by an inlet valve, 10, and an exhaust valve, 11, each of which is in the fo m of a seoqniei'ital plate, finished truly on its inner and outer surfaces, said valves being interposed, and fitted to reciprocate, between the bore of the cylinder, 1, and the periphery of the throttle sleeve, 7. .The inlet valve, 10, is provided with a port, 10 near its upper end, in position to be brought intoregi ister with the inlet port, 8, of the cylinder, and. a lug or pair of jaws, 10 is formed or fixed on its lower end, for connection with an operating shaft. The exhaust valve, 11, is similarly provided with a port, 11, near its upper end, in position tjo'be brought into register with the exhaust port, 9, of the cylinder, and a lug or pair of jaws, 11 is formed or fixed on its lower end, for connection with an operating shaft.

An inlet valve operating shaft, 12, is journaled parallel with the crank shaft, 3, on one side thereof, and an exhaust valve operating shaft, 13, is similarly journaled on the opposite side of the crank shaft. A timing gear, 14, fixed on the crank shaft, en- ,qaoes a t eaty-15, of larger diameter on the inlet valve operating shaft, and a similar gear, 16, on the exhaust valve operating shaft, rotation being thereby imparted to the valve operating shafts, in the usual manner. The. gears, 11, 15. and 16, are indicated by dotted circles in Fig. 1,

The inlet v lve, 10, is reciprocated by the shaft, 12, tllIOL gh a rod, 17, connected to the jaws, 10*, at the lower end of the valve, and passing through a guide bushing, 17 fixed in the lower end of the cylinder, 1, the lower end of the rod, 17, being coupled, by a 'con-' necting rod, 18, to a crank or eccentric on the throttle sleeve is coupled bymeans of a the shaft, 12. The exhaust valve, 11, is similarly reciprocated by the shaft, 13, through a rod, 19, connected to the jaws, 11", at the lower end of the valve, and passing through a guide bushing, 19, fixed in the lower end of the cylinder, 1, the lower end of the rod, 19, being coupled, by .a connecting rod, 20, to a crank or eccentric on the shaft, 13.

The throttle sleeve, 7, being, as before explained, guided at top by its internal hearing on the cylinder head, 6, and at bottom by its external bearing on the bore of the cylinder, it will be seen'that the inlet and outlet valves, which fit against its periphery, are entirely relieved from thrust or pressure exerted by the piston. They are also free to expand and contract, both longitudinally and circumferentially; are not subject to any unbalanced pressure; and are removed fremcontact with the explosive mixture which exerts operative pressure on thepistonin the combustion chamber between the latter and the cylinder head.

The throttle sleeve, 7, is fitted to-be reciprocated, withthe capacity of variation of the degree and direction of its movement, and the cessation thereof, as from time to time it is desired to vary the point of cut off, to reverse the direction oi rotation of the crank shaft, or to entirely close communication between the combustion chamber above the piston and the cylinder inlet and exhaust ports. To this end, the lower end lug, 7 of depending lug and by a pin, 7 see Fig. l, to a link motion valve operating gear, comprising a block 21 fitting a longitudinal slot in a segmental valve link, 21, and eccentric rods, 23, by which the link, 21, is coupled, adjacent to its ends, to cranks or eccentrics on one of the valve operating shafts, in this instance the inlet valve operating shaft, 12. The linlnQl, is coupled, by a rod, 2%, to an arm, 25, fixed on a control or regulating shaft, 96, which may be swung in its bearings, by a manually operated lever, or by a connection to an automatic governor, to vary the position of the link longitudinally relatively to the block, and thereby to vary the point of cut off or to reverse the direction of rotation of the engine, in the well known manner of valve gears of this type.

By mo 'ing the link to its central or mid position, the reciprocating movement of the throttle sleeve vxill be substantially stopped, and communication closed between the combustion'chamber above the piston and the cylinder inlet and exhaust ports, the movements of the piston-then causing it to actas a vacuum brake. It will also .be seen that by proper adiustments of the link, the degree of compression in the combustion chamber may be v ried desired.

'1 claim as my invention and desire to se-- cure by Letters Patent:

1. In a fluid pr sure motor, the combination of a fixed cylinder having inlet and exhaust ports, a piston reciprocating therein, a sleeve or tubular cut oil valve fitted to recip rocate between the cylinder and the piston, said valve having ports registerable with the inlet and exhaust ports and bearing-on fixed cylindrical surfaces of said cylinder at its opposite ends, segmental inlet and exhaust valves, each having a port register-able with one of the ports of the cut off valve and fitted to reciprocate between said valve and the cylinder, means for reciprocating the cut-off valve, and means for independently reciprocating the inlet and outlet valves.

In a fluidv )rcssure motor, the combination of a fixed cylinder having inlet and exhaust ports, a piston reciprocating therein, a

sleeve or tubular cut oil valve fitted to recip- I JCClDl'OCZIllII Li' the cut off valve, and means for indeperulcntly reciprocating the segmental valve.

MUlVllJiiiLE H. ROBERTS. vi-'itne s:

L iriox 'l'. lloirn, B. A. D. Ci-mnnens.

Copies of this patent may be obtained for five cents each. by addressing the Comm ssioner of Patents,

Washington, D. C.

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