US1036057A - Valve-gear for locomotive-engines. - Google Patents

Description

A: n. BAKER. vALvB GEAR ron woomolv meins.

Arrmouron fummo. 1o, 1910. 1,036,057, Patented Augzo, 1912.

2 SHEETS-BREST @4mm Wwf@ @fw -instead of the rod, in combination with the direct motion of the cross head, to produce the differential orrori.

ABNER D. BAKER, 0F SWNTON, OHIO.

VALVE-GEAR FOR L-OCO'MOTIVE-ENGINES.

Specification of ALetters Patent. .l

rammed frag. ao, i912.

Application tiled December 19, 1910. Serial No. 598,118.

To all whom t may concern Be it known that L'ABNER D. BAKER, a citizen of the United States, residing at Swanton, in the county of Fulton and State of Ohio, have invented new and useful ImlPI`0VI11nts inv Valve-Gear for Locomotive- .adjust-able .by the reach rod, is transmitted tothe valve by a bell crank, and is so combined with the motion of the cross head by a lever. fulcrumedon an arm of the bell crank and connected to the valve and the cross head, that early and full admission, (to the extent of port opening) at the beginning of a piston stroke, quick cut-oit' during the stroke at distances of piston travel proportioned to the extent of port opening. quick release at the end of the stroke, and equal and uniform operation of the valve on bollhthe forward and backward strokes is attained, free from the disturbing effect of vertical vibration.

My present invent-ion has for its object to provide a gear of the kind that is adapted to produce like results, by use of the direct lateral motion of the eccentric v'alve movement necessary to effect such results.

I A further object is to provide a pivotal support for the forward end of the eccentric rod independent of the radius rocker.

I accomplish these Objects by the construction, arrangementand combination of parts as hereinafter described and illustrated in the drawings, in which- Figure 1 is a side view of a gear constructed in accordance with my invention and connected to the eccentric rod and cross head of a locomotive. Fig. Q is a top view of the gear with the radius rocker and one of its bearings removed. Fig. 2 is a vertical section of Fig. 2 on line A-A of Fig. 2.

` and on line C-C of Fig. 4. and Fig. l. is a section on line B-B of Fig.

In the application of my invention to a locomotive, it will be understood that each cylinder' of the engine provided with a gear constructed as hereinafter described and that one of the cranks of the drive wheels has a lead of 9Go over the other, and that the parts of each `gear are mounted in a bracket frame l secured to and supported by the supports i) on the guide bars of the cross head, and projecting rearward therefrom, each bracket l comprising a pair of side brackets` 3 extending parallel from and integral with the base plate 4. The side plates 3 are provided with the alined bearings 5 in which is journaled the pivot pin G upon which is mounted the hollow axle T of a bellcrank having an arm 8 extending downward and pivotally connected to the forward end 9 oftheeccentric rod, and an arm l0 extending rearward at less than a right angle from the arm 8. The side plates 3 are also provided with the alined bearings ll, in which are journaled the trunnions l2 of a bell crank rocker yoke 13 comprising a pair of angled arms li having the trunnions l2 projecting opposite in alinement from their angles. the arm portions l5 convergingrearward, the portions 16 extending parallel and connected by the bolt 16 extending through the sleeve 17, and by the pivot bolt 18 -on which is pivoted one end of the reach rod and the parallel arm portions 19 having the alined end bearings Q0.

In the bearingsv Q0 of the yoke 13 are journaled the trunnions 21 of a radius rocker comprising a pair of arms 22 extending rearward, and having alined end bearings to receive a pivot pin at a radius from the trunnions 2l equal to the radial distance of the t-runnions 21 from the trunnions l2 of the bell crank rocker yoke 13. The arms converge by curves from parallel portions at the trunnions 21 to parallel vend portions foi-nungr the bearings of the pivot pin 23.

The sides 3 are provided with openings '24 into which extend the bearings Q0 of the rocker yoke. and the openings are of sutlicient extent to permit the movement of the bearings through an arc equal distances above and below a horizontal line Vintersect.- ing a line radial to the trunnions. 12 of the rocker volte at right angles.

Above the bearings 2O of the rocker yoke the sides i); of the frame ll are provided with the alined `split bearings 25 in which is mounted a rock shaft 26 having tixedly mounted thereon between the bearings 25,

a sleeve 27 having av pair of integral rock arms 28, and on an extension of the shaft outside the bearing of the inner side plato 3 is mounted a rock arm, Q9, the free end of which is pivotally connected by a pin 30 to one end of the'valve stem. The free ends of the rock arms 28 are provided with a pivot pin 3l upon which is pivoted one end of a lever 32, the opposite end of which is connected by a link bar 33 with the cross head. N

i Near the pivot pin 3l, the lever 32 is fulcrumed by a pin 341 to the bifurcat-ed end portion of a radius link which extends rearward between the arms 22 of the radius rocker and is pivoted thereto by the pin 23 at a radial distance from the pin 34 equal tothe radial distance between the trunnions 2l of the radius rocker and the trunnions l2 of the rocker yoke. The rear end port-ion of the radius link extends beyond the pin 23 and is pivotally connected by `a pin 36 to the upper bifurcated end portion of a link bar 37, the lower end portion of which is also bifurcated and connected by a pin 38 to the free end of the arm 10 of the bell crank.

As shown in Figs. 1 and 3 the parts are in position for rearward movementof the engine with the piston in the middle of its forward stroke and the eccentric rod at the end of its forward movement.

Thus constructed and connected it will be seen that the direct movement of the eccentric rod is transmitted in a lateral direction n b v the bell crank through the link 37 to the radius link which is controlled and directed by the radius rocker through an arc having a radius equal to the radius of the rocker, and produces a direct reciprocation of the radius link that varies in distance according to the distance the pivot of the radius rocker is established by the reach rod above or below the center of the arc through which it is adjustable. This reciprocation of the radius link is transmitted to the valve by the lever and the arms 2S and 29 of the rock shaft. as modified by the lever 32, and produces an alternating quick and slow `speed movement of the valve whereby,-ac cording to the extentI of port opening lestablished bv the reach roth-full admission at the beginning, prompt cut-off during, and prompt release at the end, of each piston stroke is effected in all respects the same as by the gear shown and described in said application Serial No. 484,788. lVhile, however, the ultimate valve movement and the results attained by my present gear is the same as produced by m v said former gear, my presentI gear differs from the latter in that the variable direction of arc move* ment produced by the radius rocker is transferredfrom the forward end of the cecentric rod to the rearward end of a radius link, whereby infmy present gear the forward end of the eccentric rod is supported by the bell crank and travels through a constant arc and the radius rocker is relieved of its weight, thereby avoiding difference in the angularity of the eccentric rod land making the adjustment of the radius vrocker easier.

By the construction, arrangement and combination of parts in my present gear the direct movements of both the eccentric rod and cross head are utilizedas in gears of the Ialschaart type without tbe use of the link lever and slide block used in'that type of gears to vary the lengt-h of valve stroke, and I also avoid the use of the slide block and guide ways of that type of gear to which the radius rod is pivotally attached andupon which the combination lever operated by the cross head is fulcrumed, and thereby avoid the increased friction, unequal wear, lost mot-ion, and greatly increasedl cost of maintenance incident to ythe use of such means of varying the length of valve stroke, and of that of the. eccentric rod, as compared with the means employed in my gears -t-o effect such purpose. 4

That I claim to be new isd l. In a variable cut-off valve gear for locomotives, the combination with the main frame, reach rod, eccentric rod, cross head and slide valve, of a gear frame mounted on the main frame, a bell crank journaled in the gear frame, and having one arm pivotally connected to the ,forward end of theec centric rod, a rock shaft journaled in the gear frame having one arm connected to the valve by the valve stem, and one arm for rocking the shaft, a lever pivoted by one end to the actuating arm of the rock shaft and having the opposite end linked to the cross head, a radius link pivoted by one end to the lever near its pivotal connection to the rock arm, a link connecting the .opposite end of the radius link to the other arm of the bll crank, va bell crank rocker journaled on the gear frame and having one arm pivotedto the reach rod, and a radius rocker pivoted to the outer end of the other arm of the rocker by one end, and pivotally connect-ed by its opposite end to theradius link at a radial distance equanl to the radial distance ofi'ts pivotal connection to the rocker from the pivot of the rocker.

2. In a variable cut-ofi valve gear for locomotives and the like, comprising a gear frame adapted to be supported by the main frame, said gear frame having parallel side members, each provided with a plurality of hearings, alined with corresponding bearings of the other, a bell crank journaled in one pair of bearings, having one arm .pivotally connected to the forward` tidiofthe eccentric rod, a rock shaft journaled'in'anarm of the bellv crank, a bell crank rocker' other pair of bearings, and having a pair of rock arms between the sides of the frame, and a -third arm without. the frame connected to the stem of the valve, a lever pivoted by one end to and between the inner pair of rock4 arms and link connected at the opposite end to the cross head, a radius link pivoted at one end to the lever near its pivotal connection to the rock arms, and link connected at the opposite end to the ,other yoke having angled side arms journaled at the angles in opposite bearings of the frame, said arms converging to a lpivotal connec- 15 tion with the reach rod at one end and hav- 'bearings of the ing bearings at their opposite ends, and a radius rocker comprising a pair of arms journaled in the end bearings of the bell crank rocker and converging to and jointly pivoted 'to the radius link, at a radial distance equal to the radial distance between the bearings of the rocker yoke and the radius rocker.

In witness whereof I have hereunto set my hand, this 5th day of December, 1910.

ABNER D. BAKER.

.I In presence of-d i WM. J. FRITSCHE, M. S. 'SMrrrn

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