US902603A - Valve-gear. - Google Patents

Description

C. J. PILLIOD & A. D. BAKER.

VALVE GEAR.

APPLICATION FILED NOV. 20, 1907.

Patented Nov. 3, 1908.

' 2 SHEETS-SHEET 1.

G. J. PILLIOD & A. D. BAKER VALVE GEAR. APPLICATION FILED NOV. 20, 1907- Patented Nov. 3, E908.

2 8HBETSSHEET 2.

INVENTQ R3 WITN ESSES.

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CHARLES J. PILLiOD, OF ANGOLA, INDIANA, AND ABXER D. BAKER, OF SWANTON, OHIO,

ASSIGNORS TO FREDERICK E. PILLIOJ), TRUSTEE, OF SWANTON, OHIO.

VALVE-GEAR.

Specification of Letters Patent.

Patented Nov. 3, 1908.

Application filed November 20, 1907. Serial No. 402,955.

To on whom 'it may concern:

Be it known thatwve, CHARLES J. PrLLIoD,

a citizenof the United States, residing at Angola, in the county of Steuben and State of Indiana, and Anxnn D. BAKER, a citizen of the United States, residing at Swanton, in the county of Fulton and State of' Ohio, have invented anew and useful Improvement in Variable- Cut Off Valve- Gear for Engines, of which the following-is a specification.

Our invention relates to a variable cut-off and reversing valve gear for locomotives andall classes of steam, air or other driven engines, and has for its object to provide an efficient valve gear of the kind, that is adapted to produce free admission at the beginning and free release at the end of each stroke, that isadapted to operate the valve .to produce equal cut-off from each end of the cylinder at any desired distance of piston travel to which the gear is adjusted by the reach rod, and. that whenapplied to lo .comotiv'es or traction engines is unaffected by the lateral vibration produced by running over tracks oruneven surfaces.

A further ob ect is to provide a gear of I the kind that is of'light and durable con- 'structionand adapted to be attached to a locomotive frame in position where all the parts are, readily accessible.

.We accomplish these objectsby the construction, arrai'igement and combination of parts as hereinafter described and illustrated in the drawings, in Which Figure 1 is aside elevation of a valve gear constructed-in accordance with our invention and attached to a locomotive. F ig. 2 is 'a cross section of-tlie same on iine a,'-c of Fig.

l, and -y of F ig. 4. is a cross section .of the same on line w-w, and Fig. 4': is a top view of the same.

In the drawings 1 designates the'frame of a locomotive partly broken away, and 2 the Valve gear frame attached to the frame 1, and in which the valve'gear is mounted and supported in position. p

3 designates the cylinder, 4- the guide bars, 5 the cross head, tithe piston rod, 7 the steam chest,.- S-the valve stem. 9 the main driving wheel, 10 the secondary driving wheel, 11 the reach rod of the reversing le ver, 12a pedestal support mounted on the main frame, 13 a rock shaft bearing at the top of the pedestal, 14 a rock shaft mounted 'in the bearing. 15 a rock arm mounted on the rock sl'iaft H, to which is connected the reach rod 11, it; a rock arm extending opposite to the lever l5, 17 the crank of the main driving wheel 9, 18 the main connecting rod connecting the cross head 5 of the crank 17 'of the main driving wheel, 19 the crank of the driving wheel 10, and 20 the parallel connecting rod connecting the crank 19 w1th the crank 17 of the main driving wheel.

To operate the valve stem-8 thereis provided a valve gear which is connected to the crank 17 of the main driving Wheel, the cross head 53, and the rock arm 16 of the rockshaft'ld.

The gear is supported on the main frame 1 by the gear frame 2, which is attached at the front end to the guide yoke 21, and at the rear end to the standard 22, mounted on the main frame 1. The gear frame 2 is also sup ported on the upper guide bar 4 by the standaid 23, which is bifurcated above the base 24,

and is provided with the arms and 26 which are integral with the parallel sides 27 and 28 respectively of the gear frame 2.

The arms 25 and 20 are provided with the alined bearings 29 and 30 respectively, in which are journalcd the rock trunnions 31 and 32 of a U shaped rock yoke 33, having the arms 34 extending above the sides 27 and 28 of the frame 2, these arms 34 having their upper end portions provided with thealined bearings 35 in which are journaled the trunnions 36 of the arms 3? of the bifurcated link 38, the lower end of which is provided with a link bearing 39, to which there is pivotally connected by the pin 40 the bifurcated oscillating barel. The trunnion 31 of the rock yoke is extended beyond its bearing 29 and has mounted thereon the rock arm 42 to which is piv'otally connected one end of the connecting rod 43, the opposite end-of which is pivotally connected to the rock arm 16 of the rock shaft 14.

, Centrally of the frame 2 the sides 27 and are provided with the alined bearings 44 in which is journaled the rock shaft 45, upon which is mounted between the sides 27 and 28 of the frame 2, a bell crank having the short on (fan! arm 46 and the long arm- 4-7. To the outer end of the bell crank arm 4i6=there is pivotally connected one end of link 48,.which at the opposite end pivotally connected by a pin to the connecting rod 50, one end of which connected by the pin 51 to the oscillating her 41, and the opposite end to a crank 52 mounted on the crank pin 53 of the crank 17 oft-he main driving wheel 9. To the lower end of the rock arm. 4;? there is pivotall y con neeted one end of a connecting rod 5a which at the opposite end is connected to a yoke 55 secured to the cross head 5.

Adjacent to the rock shaft 4-5 the sides 27 and 28 of the gear frame 2 are provided with the alined bearings 56, in which is j ournaled the rock shaft 56 upon which is fixedly mounted the bell crank 57, to the outer end of the upper arm 58 of which there is pivoted the upper end of a link rod 59. Thelower end of the link rod 59 is pivotally mounted on a pin 60, attached to the pscillating bar 41. The lower end of the lower arm 61. of the bell crank lever 57 has pivotally connected thereto one end of a connecting rod (32, the opposite end of which is pivotally connected to a cross head (33 to which is attached the valve stem 8, provided with the guide bars (34.

The crank 52 is fixedly mounted on the pin of the crank 17 at a suitable angle relative to the center line of the crank, and is of suitable radius less than the radius of the crank 17 and extends inward.

The rod 50 and the bar 41 pivotally connected thereto by the pin'ol, together form a pivot jointed eccentric rod connecting the eccentric crank 52 with the link 38.

The valve gear thus constructed and connected, with the parts properly proportioned operates as follows: The reciprocation of the cross head 5 revolves the crank 52 and thereby oscillates the pivot jointed eccentric rod comprising the rod 50 and the bar 41. The cross head 5, being also connected to the rod 50, through the connecting rod 54:, the bell crank arms 47 and 46, and the link 48, in its reciprocation causes the pivot pin 51, forming the pivot joint of the rod 50 and the bar 4-1, to move throiwh an ellipse that modifies the oscillation of the bar 4L1, and changes the path of motion of the pivot pin 60 which connects the bar ll to the mechanism which transmits reciprocating movement therefrom to the valve This modified path of moti'on of the pin 60 gives to the valve anlovement that produces equal admission and release at each end of thecylinder, and cut oil during each stroke at equal distances from each end i of thc cylinder, however the cut off may be varied by the reversing lever.

The irregularity of cut-off lncldent to variable cut-oil valve gears that our lnvention is mainly designed to correct, is due to.

ceases the angularity of the eccentric rod, which operates the valve, whether directly or indirectly,-and of the connecting rod of the piston, whereby the valve moves with greater speed, and the piston travels a greater dis tance before cut-oft occurs, from one end of the cylinder than from the other When motion is transmitted to a valve, either directly or indirectly, by an eccentric rod that receives its motion direct from an axle or shaft that is revolved by the main connecting rod of the piston, the travel of the valve is a reproduction on a smaller scale of the travel of the piston, excepting only that the travelof the valve in s a lead over the travel of the piston. The necessary result of this variation of the travel of both piston, in order to equalize the cut-off, and 'l hat this (lllEtlQi'lt travel of the valve can only.

be ell ected by producing a different oscillation of the eccentric rod from that ot th main connecting rod. To obtain this drilerout oscillation of the eccentric rod, we have substituted 'for the ordinary eccentric rod a phxotally jointed eccentric rod comprising ihc connecting rod 50 and the oscillating bar 41, and by connecting the rod 50 to the cross head of the piston by mechanism comprising the connecting rod 54, the bell crank arms i? and 46, and the link 48, properly proportioned to each other, we produce an elliptical instead of a circular n'iovementof v the pivot'pin 5i connecting the oscillating bar 41-1 to the connecting rod 50, the path of motion of the pin 51 being such as to change the path of motion of the pivot pin 60 of the oscillating bar 41, from that which it would have if the bar ll and the connecting rod 50 formed a rigid eccentric rod actuated by the axle of the driving wheel or whereby the defective movement of the valve incident to the angularity of an ordinary eccentric rod is corrected to equalize the motion of the valve during both strokes and produce uniform admission and release at each end of the cylinder, and cut-off at equi-distant points from each end thereof. The motion of the valve obtained by our gear also produces a quick opening and closing of the inlet ports, while the movement of the valve is such that between the times of opening and closing, the ports remain open to the full extent to which they are set to open by the reversing lever.

By the construction shown and described the action of the valve is undisturbed and unaffected by lateral'vibration, such as ooavoid the effects of lateral vibration.

curs in locomotive gears, byreason of the yielding of the springs in runningover inequalities ot' the track, wherehy the relation oithe eccentric rod to the valve seat 1s suddenly changed and causes shifting ofthe Valve thereon. This a ction is avoided by our nivotallyjointed eccentric rod and 41, it'

21. A valvegear for engines of the class described,"comprisinga support, a member reciprocably mounted on the support, a pivot mounted on the crank sl aft eccentric thereto, a p1v0t-3o1nted eccentric rod connectlng the eccentric pivot and the reciprocable niember, neans connecting one member of the eccen-' tric rod to the valve and adapted to t *ansmit the lateral motion ot the eccentric rod to reciprocate the valve. and means indirectly connecting the othcr member ot'the eccentric rod withthe piston oi" the engine, adapted 1' head, crank shaft andmainjconnecting ro'd to modify the oscillation of the eccentric rod produced by the eccentric pivot of the shaft,-

for the purpose set forth. Y

In a valvegear for engines-the com-.

hinati'on with the' valve. cross head, crank shaft and mam connecting rod of an engine, otmeans to equally reciprocate the valve on the forward and backward strokes, coinpris ing: a support,.:\ pivot mounted on the crank shaft eccentric thereto, a pivotqomted' eccentric rod connected .at one end to the eccentric pivot. and connectedbva link at theopposite end to the support, means connecting the eccentric rod to the valve, and adapted to transmit the lateral motion'ot thecccentric rod to rcciprocalc the valve, and ni-eansconnccting the cross head wiih'a member of the eccentric rod, adapted to modify the-oscillation of the eccentric rod producedby the eccentric pivot of the crank pin-pose set forth.

In a variable cut oft'valve gear for en nines. the combination with the valve, cross an enginmoti means to equally recipmcate f the valve on the forward and backward strokes, comprising an-adjustable support, a ig eniber vreciprocably mounted on the sup tort, apivot mounted on'the' crankshaft J g centric thereto, a pivot-jointed eccentric rodconnecting the eccentrlc and the reciprocable it will besecn therefore tl at by our shaft. for the eccentric rod to the valve, adapted to transinitthe lateral motion ottheeccentric rod to 'reciprocate the valve, andnieansconnecting the othcrxmember of the eccentric rod with E iion of the eccentric,rod produ'ced by the eccentric, for the purpose set forth. I at. In a variable cut ott valve gen r for en d, crank shaft, and main connecting rod It an engine, of means to equally reciprocate the valve on the forward and backward 1: roli'es, comprising an. adjustable support, a member reciprocably mounted on the support, a pivot mounted on the crank shaft eccentric thereto a pivot-jointed eccentric rod connecting the eccentric and t 10 recipros cablemember, means connecting one member of the eccentric rod to the valve adapted trio" rod to reciprocate the valve, and means connecting the other inen'ilier of the eccentric rod with' the cross head, comprising a bell crank, and links connecting the arms of the bell crank respectively witlr the eccentric rod, and with the cross head, adapted to modify the. oscillation ot the eccentric rod produced by the eccentric, for tlie purpose set forth,

5. Ina variablecut otl' valve gear forengines, the combination with the valve, cross head, crank shaft, and main connecting rod of an engine, of means to equally reciprocate the valve on the forward and backward strokes, comprising an adj ustablc support. a member reciprocablv mounted onthe-sun port, a pivot mounted on me crank shaft eccentric tl'1ereto,.a pivot-jointed eccentric rod connecting thec-ccentric and the reciprocable member, means for tasmitting the ,lateral. motion oi the eccentric rod to the valve, comprising a bell. crank. and link rods coni'lecting the arms ot the bell crank re- -'spectively with the member andthe vvalve, and means adapted to modify the oscillation bt' the eccentric rod produced by the. eccentric pivot ot' the crank shaft, comprising a" bell crank, and links connecting;' the arms'ot' the bell crankrespectively win the other i'nen'iber' ot the eccentric rod and with the cross head.

grilles, the combination with the valve, cross head, crardr shaft, and main connecting rod journaled on the support and provided with a radial arm, means to rock the shaft and the arm through an arc, a pivot mounted on' the crank shaft eccentric thereto. a pivot-jointed eccentric rod connected to the eccentric and to a linlcconnected to the arm of therock mei'nber, means connecting one member at the the crosshead, adapted to modify the oscilla to transmit the lateral motion of the eccen: v

3. In a variable cut oli' valve ear for, en-

filllcS, thecoxnbination with the 'alve cross of an engine; of a SHpPOlt, a rock shaft 7 shaft, means connecting the eccentr c rod to the valve, adapted to transmit the lateral mosigned our'names in the presence'of two sub 13 tion of the eccentric rod co yecip no cate the scribing Witnesses, this twenty-third day of valve, and means adapted-"t0 modify the October, 1907.

oscillation of the eccentric rod produced by v the eccentric, for the purpose set forth, comig g g prising a bell crank, and links connecting the v arms of the bell crank respectively with she In presence of eccentric rod and the cross head. F RED H. KRUSE,

In witness whereof, We have hereunto A. M. SHQWALTER.

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