US2855692A

US2855692A - campbell

Info

Publication number: US2855692A
Authority: US
Publication date: 1958-10-14
Anticipated expiration: 1975-10-14

Description

Oct. 14, 1958 D. H. CAMPBELL 2,855,692

INJECTOR GAUGE TOOL FOR DIESEL ENGINES Filed Dec. 7, 1953 IN VEN TOR. DEWEY H. CA M PBELL United States Patent INJECTOR GAUGE TOOL FOR DIESEL ENGINES Dewey H. Campbell, Newport, 0reg., assignor to I. & G. lgranufacturing Co., Portland, Oreg., a corporation of egon Application December 7, 1953, Serial No. 396,673

3 Claims. (Cl. 33-481) My invention relates to injector gauge instruments for diesel engines, particularly General Motors engines.

The primary object of my invention is to set the injector plunger of the injector to its proper setting by placing my instrument over the top of the injector and adjusting the rocker arm until my gauge indicates the proper setting.

In the use of my new and improved instrument, the same is adapted to be set by a standard plug gauge, after which my new and improved instrument is applied to the top of the injector. The rocker arm is then adjusted to set the injector plunger to correspond to my gauge setting. Heretofore this adjustment has been made by a gauge pin whose bottom rests in a hole located on the top of the injector body and having a cross bar on the top for engaging the top of the follower which operates the injector plunger.

When the operator contacts the said cross bar on the top of the follower he knows that the plunger is inthe proper position. This has not been an accurate method of adjusting the injector plunger, because of dirt becom- 1 ing lodged in the said hole on top of the injector, and also because of the likelihood of improper alignment of the gauge.

With my new and improved instrument, a tubular tool body having legs for engaging the top of the injector surrounds the follower and spring, the instrument having a dial micrometer forming part thereof, the said dial micrometer being adjusted by a standard plug gauge before applying the same to the injector, thereby giving an accurate reading in the adjusting of the said rocker arm contacting the injector follower.

These and other incidental objects will be apparent in the drawings, specification and claims.

Referring to the drawings:

Figure 1 is a perspective view of my new and improved gauge instrument for injector plungers.

Figure 2 is a front view of the instrument, wherein a plug gauge is shown in place adjusting the stem of the instrument to the proper reading.

Figure 3 illustrates the plug gauge, partially in section,

that is used to set my new and improved instrument.

Figure 4 illustrates how my new and improved instrument is applied down over the injector plunger, resting on the body of the injector, and over the plunger rocker arm which is broken away.

Figure 5 is a plan view of Figure 4, taken on line 5-5, particularly showing how the supporting legs of a my instrument avoid the hold down clamp of the in- \jector.

Figure 6 is a front view, taken on line 6-6 of Figure .4, illustrating how the supporting legs of my instrument avoid the injector hold down clamps and rocker arm.

My instrument includes a cylindrical tubular tool body 1, having an opening or slot 2 running throughout most of its length. The object of this slot is to straddle the rocker arm 3 of the engine. The rocker arm 3 operates ;he injector plunger rod 4 through the usual follower 16 and the stud ball seat assembly 4A, the seat having a flange 4B for resting on the follower, referring particularly to Figure 4. The tubular body 1 is also cut away on both sides at 6 to form three legs 6A which avoid the

ringers

26 and 27 of the hold down clamp 25 of the injector.

Formed on the upper end of the tubular tool body 1 is a horizontal end wall 7 in which the stem 8 of the dial micrometer gauge 9 is clamped. The end wall is split as indicated at 10 so that the clamping screw 11 will clamp the jaws 12 to the stem 8 of the dial micrometer gauge. The bottom 13 of the stem 8 rests on the top shoulder 14 of the body 1.

The term instrument is used herein to designate the combination of dial micrometer 9 and gauge tool body 1 in assembled relation as shown in Figure 1.

The-dial micrometer gauge 9 has the usual measuring plunger 15, the operation of which will be described later. The injector plunger 4 has the usual follower 16 keyed thereto. This follower rests on the top of the spring 17, which maintains the upper end of the follower in contact with the rocker arm 3.

Referring to Figure 3, I show a standard plug gauge 18, consisting of a cylindrical tubular body member 19 with an enlarged head 20 forming a peripheral shoulder 21. The shoulder 21 corresponds to the upper surface 22 of the injector body 5. The upper surface 23 of the plug gauge 18 is adapted to contact the lower end 24 of the measuring plunger 15 of the dial micrometer gauge 9 when adjusting the latter. There are various lengths of plug gauges 18 for the different sizes of Diesel engines.

I will now describe the operation of my new and improved instrument for adjusting plunger rods for injectors. Referring to Figure 2, I set the dial micrometer by inserting the plug gauge 18 within the lower end of the body member 1 of my instrument wherein the lower ends of the legs 6A come to rest on the shoulder 21 of the said plug gauge. The upper surface 23 contacts the lower end 24 of the micrometer gauge plunger 15. The operator then adjusts the micrometer gauge dial 9A to a zero reading under the pointer 9B by rotating the rim of the gauge. This gauge adjustment is a standard feature of various well known types of dial micrometer. This adjustment has just been made in Figure 2.

When the gauge instrument is removed from the plug gauge 18, the pointer will take a position as indicated in Figure 1 away from the zero mark. My new and improved gauge instrument is then placed over the plunger assembly of the injector, the legs 6A coming to rest on the surface 22 of the injector body 5. The legs 6A of my gauge instrument are cut away or placed on the tool body 1 so as to avoid the rocker arm 3 and the

fingers

26 and 27 of the hold down clamp 25, as best illustrated in Figures 4, 5 and 6, supporting tool body 1 perpendicular to surface 22. The lower end 24 of the plunger 15 of the dial micrometer 9 contacts the upper surface of the flange 4B of the seat 4A of the ball stud assembly resting on the upper end of the follower 16.

In the later model engines, the ball stud assembly is eliminated, in which case the plunger 15 would rest directly on the upper end of .the follower.

When the bottom end 24 of the plunger 15 of the dial micrometer. comes to rest on top of the flange 4B of the seat 4A or the top of the follower as the case may be, the rocker arm is adjusted so as to raise or lower the follower until the pointer 9B comes to rest on the zero mark of the dial micrometer. This indicates that the injector plunger 4 has been adjusted to the proper position, as measured by the distance between the top of the follower 16 and the surface 22 on the top of the injector body 5. This distance corresponds to the distance on the plug gauge between its top 23 and its shoulder 21.

It is a very simple matter to apply my gauge instrument as above described. to the upper end assembly of the injector an'ddue tothe .fact that it has three legs 6A coming down on'the surface 22 of .the't'op vof the injector body, a three-point tripod support is obtained which insures accurate measurement between theupper end of the follower and the upper surface 22 of the injector body.

I claim: i i 1. A dial micrometer diesel engine injector gauge tool for positioning the measuring plunger of a dial micrometer on an injector follower and spring assembly of a diesel engine wherein said dial micrometer hasa' measuring plunger projecting from one end of a tubular stem on the micrometer; said gauge tool comprising a tubular body with wall portions of the tube cut away at one end thereof to form a tripod support with three supporting legs adapted to straddle portions of the injector structure and support said tubular body .on a surface of the injector structure with portions of said tubular body closely surrounding said injector follower and spring assembly, a clamp for said micrometer stem on the other end of said tubular body arranged to place said measuring plungerlongitudinally within said tubular body in a position to engage said injector follower, and a shoulder on said tubular body adjacent said clamp arranged to engage and position said end of said micrometer stem.

2. A dial micrometer diesel engine injector gauge tool comprising a cylindrical tubular body having wall portions of the tube cut away at one end thereof to form a tripod support having three legs arranged to support said body perpendicular to a flat supporting surface, an end wall on the other end of said body having a clamp to receive a dial micrometer with a portion thereof extending longitudinally within said body, and a portion of the tube wall being cut away on one side of said body adjacent said end wall forming a positioning shoulder parallel with said end wall for said dial micrometer.

3. In combination with the tool defined in claim 2, a plug gauge having a cylindrical body with a diameter to fit within said tubular body of said tool and an end surface in a position to engage said extending portion of a dial micrometer when a dial micrometer is mounted in said clamp, and a head on said plug gauge body having a peripheral shoulder to engage and support the ends of said legs.

References Cited in the file of this patent UNITED STATES PATENTS