US1789209A - Valve-spring connection - Google Patents

Description

Jan. 13, 1931. D. F. ASBURY 8 VALVE SPRING commc'r on I Filed April 24. .1930

Patented Janis, 1931 l UNITED STATES PATENT o F cE DORSEY F. ASBURY, F BECOMES ISLAND, MARYLAND I vALvE-s'rRme coivlvnorroiv Application filed April 24,

' y 7 tachably interengage the spring with the stem of the valve to thereby reduce the number of parts now required in such structures and at the same time to sofeii e'ct the interengagement between the valve stem and spring that the valve closing force of the latter is utilized to maintain the as-semblybetween the spring and valve, and at the same time permit the disassembly of such parts to be easily and simply accomplished.- Other purposes and advantages of my invention will be hereing after pointed out.

'I will describe my invention as applied to the poppet valve of an internal combustion engine, but it will be apparent that the same can be employed in any poppet valve structure regardless of the nature of the device with which said structure is associated and that the same in susceptible to changes and variations by the exercise of only ordinary mechanical skill and without departing from the 39 scope thereof.

In the drawings chosen to illustrate my invention, the scope whereof is set forth in the appended claims:

Figure 1 is a vertical section of the upper end'of a cylinder of an internal combustion engine showing a poppet valvein accordance with my invention in associationtherewith; Figure 2, an enlarged detail view. of theconnection between the valve stem and valve Figure 3, a section on the line Figure 2;

Figure 4, a section on the line 44 of Figure 2; and

Figure 5, a detail view looking toward the upper end of the spring. Referring in detail to the drawing A indicates generally a cylinder head of an internal combustion engine having a port 10 controlled by a'poppet valve B. This valve the stem 11'. The free end of the portion 14 as the spring expands. To disassemble, the

930. Serial ii o. 446,95 l.

embodies the usual stem 11 slidably mounted 'in a bearing 12 fixed inthe upper end of the head A and whereby the valve Bis movable by reciprocation 'to open and. close the port 10 as is well understood. A coil spring 13 surrounds the stem 11 and has its lower end seated against the head A andlfrom which latter it reacts to constantly urge the valve B to closed position as will hereinafterappear. The upper end of the spring 13 is reduced in radius and finally shaped to provide an upwardly'inclined portion 14 which engages in a correspondingly inclined laterally opening'hole or pocket 15 formed in presses against the bottom ofthe hole or pocket 15 tourge'the'valveB closed, it being i of course understood that the spring 13 is undercompression when assembled a sshown in Figure 1. I The cross dimension of the pocket 15 is'slightly greater than the cross dimension of the portion 14- of the spring and the bottom of said pocket is in the form of a spherical dish 16 which is contacted by a spherical free end 17 of the portion 14 to provide a jointbetween the spring 13 and stem 11 permitting'universal movement of the spring subject to the limitation imposed by'athe side wall of the pocket. The bottom 16 ofthe pocket 15 is positioned in the longitudinal axis ofthe stem 11 whereby the-spring 13 exerts its force againsta central spot of the stem and longitudinally of the l'atter.-

Theconstruction heretofore described is easily assembled and disassembled. To assemble, it is only necessary to hold valve B toits seat, place the spring 13 around the stem with the end portion l4 facing the mouth of the pocket 15. The'spring is then compressed with any suitable tool untilthe free end of the portion 14 registers with the mouth of the pocket. The pressure on the spring is thereupon released when the portion 14 will automatically enter thepocket spring 13 is compressed and during such compression'the portion 14 is automatically removed from the pocket 15. When such removal is complete the spring ismanipulated to' shift the portion 14 to one side of the mouth of the pocket and then permitted to expand, the portion 14 being held out of the plane of the pocket until said portion moves above the mouth of the pocket.

My valve structure hereinbefore described possesses many advantages, some of which cause undue friction between one side-of the stem and its bearing, such tendency can be easily eliminated by bending the end 14 in a direction opposite to such lateral resultant a 1 sufiicient amount to neutralize such tendency.

(0) The usual spring cap and spring cap retaining pin are dispensed with.

(d) The mass that has to be moved by the spring is lightened and the valve therefore operated at a higher rate of speed.

I claim:

1. In a valvestructure, a poppet valve including a stem having an inclined pockettherein, and a spring urging the valve to closed position andhaving one end thereof projecting into said inclined pocket.

' 2. In a valve structure, apoppet valve including a stem having a laterally opening pocket therein whose entrance and bottom are respectively positioned at different locations along the stem, and a spring normally contacting with the stem at thebottom of the pocket only and exerting aforce against said bottom longitudinally of the stem to urge the valve in one direction.

3. In a valve 1 structure, a poppet valve including a stem having a laterally opening pocket therein whose bottom is located in the axis of the stem and whose entrance and bottom are respectively positioned at dif ferent locations along the stem, and a spring normally contacting withthe stem at the bottomof the pocket only and exerting a force against said bottom longitudinally of the stem to urge the valve in one direction,

4. In a valve structure, a poppet valve including a'stem' having a laterally opening pocket therein whose entrance and bottom are respectively positioned at different locations along the stem,'and a spring normally contacting with the stem at the bottom of the pocket only and exerting a force against said bottom longitudinally of the stem to urge the valve in one direction, the contacting portions of the spring and stem being shaped bottom of the pocket only and exerting a force against said bottom longitudinally of the stem to urge the valve is one direction.

6. Ina valve structure, a poppet valve including a stem having a laterally opening pocket therein inclined to and having its bota poppet valve including a stem slidably mounted in the fixed member, said stem hav-,

ing a laterally opening pocket therein whose entrance and bottom are positioned at different locations alongthe stem, and a coiled spring surrounding the stem with one end engaging the fixed member and its other end engaged in the pocketand contacting only with the bottom thereof, said spring exerting a force longitudinally of the stemand against said pocket bottom to urge the valve in one direction.

8. In a valve structure, a fixed member,-=apoppet valve including a stem slidably mounted in the fixed member, said stem hav ing a laterally opening pocket therein whose entrance and bottom arepositioned at differentlocations along the stem, and a coiled spring surrounding the stem with one end in both located in'the axis of the stem and substantially in the axis of the spring.

9. In a valve structure, a poppet valve includinga stem having a laterally opening pocket therein inclined to the axis of the stem, and a spring having one end engaged in said pocket and exerting a force constantly urging the said end thereof into the pocket to maintain the assembly between the valve and spring and to urge the valve in one direction.

10. In 'a valve structure, a poppet valve including a stem, a spring for urging said valve to closed position, and a direct .inter fitting connection between one end of the spring and the stem which includes surfaces on both the stem and spring inclined lZOithG direction of the force of the spring and preventing lateral displacement of said spring end with respect to the stem.

In testimony whereof I hereunto aflix "my signature.

DORSEY F. ASBURY.

to provide a ball and socket joint permitting 7

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