US2185943A

US2185943A - Apparatus for testing the output of

Info

Publication number: US2185943A
Authority: US
Publication date: 1940-01-02
Anticipated expiration: 1957-01-02

Description

Jan. 2, 1940. HARTRlDGE 2,185,943

APPARATUS FOR TESTING THE OUTPUT 0F PUMPS Filed Nov. 16, 1938 2 Sheets-Sheet l ll l2 Inventor Attorney Jan. 2, 1940. HAR D I 2,185,943

APPARATUS FOR TESTING TUE OUTPUT OF PUMPS Filed Nov. 16, 19:58 2 Sheets-Sheet 2' In ventor Leslie Hay fridge A t torney 'Patented Jan. 2, 1940 mats- V UNITED STATES PATENT I other Leslie Hartridge, Ponders End, England Application November 16, 1938, Serial No. 240,804

I In Great Britain November 4, 193'7 4 Claims. 01, 73-51) This invention has reference to apparatus for testing the output of the pumps of Diesel engines, said apparatus having means adapted to drive the pumps and means adapted to direct the oil from the injectors of the pumps into measuring flasks whilst the pumps make a certain number of revolutions. The invention is concerned with automatically effecting the directing of the oil exactly throughout the time represented by a predetermined number of revolutions of the pump at a predetermined rate. r

According to the invention apparatus as above set forth' is provided with timing gear arranged to operate the oil directing means to cause oil to flow into the flasks during a predetermined numberof revolutions of the pump, saidgear being normally inoperative with respect to said diverting means and being made operative with respect thereto by handoperated setting gear.

The timing gear is preferably connected to the directing means by a double acting trip gear. Normally, the trip gear is so set that the oil is not directed into the flasks. Upon operation of the setting gear the timing gear becomes operative with respect to the trip gear and the arrangement is such that the first action of the trip gear is to actuate the diverting means to cause oil to flow into the measuring flasks and the other action, under the control of the timing gear, is to stop the flow of oil to the said flasks. The timing gear preferably comprises a cam, a disc or the like with a projection arranged to displace a spring-restored lever at each revolution and a push rod adapted, underthe control of the setting means, to operate the oil directing means either to cause the oil to flow into the flasks orto stop flowing into them. The oil when not flowing into the flasks may be directed into a sump.

40 The preferred way of carryingout the in-' vention is illustrated in'the accompanying drawings wherein:

Fig. l is a perspective view showing the timing gear, setting gear and trip gear;

Fig. 2 'is a perspective view showing an oil directing or diverting means;

Fig. 3 is a detail, partly in section, of two teeth comprising part of the timing gear; and

Fig. 4 is a diagrammatic front view of a testing apparatus incorporating the present invention.

The timing gear comprises a worm reduction gear in a housing I driving a shaft 2 on which a disc 3 is mounted. The worm, not shown, is driven by a shaft 4. The disc 3 has an eccentric projection 5 which, whenthe disc rotates, contacts withone of two profiles ii, I at the tops of

teeth

8, 9, respectively. The teeth are pivoted at If) to a lever ll. The fulcrum of the lever is provided by a pivot I2 on a vertical block it mounted on the same base plate M as that carrying the housing I. The other end of the lever is connected by means of a joint l5 to a sub, stantially vertical push rod Ni.

The setting gear comprises an oscillatable arm ll mounted on a shaft l-8.' The shaft is borne bytongues l9 on a bracket 26 secured to a vertical post/2| rigid with the base 14. The arm H is normally held in the'position shown owing to the pull ofa spring 22 connected at one end to an arm 23 rigid withthe shaft I8 and at the other end to a lug 2% on the bracket 20. A handle 25 at the forward end of the shaft [8 enables the arm I? to be moved against the opposing action of thespring 22. A spring 26 connected at one'end to a pin .21 on the arm and at the other end to .a pin '28 on the push rod H5 provides a lost motion connection between the arm I! and the push rod, said connection being such that I the rod 16 can reciprocate longitudinally with respect to thearm I! but turning of the arm ll to'the left-(under theaction of the handle and to-the right (under the action of the spring 22) causes the spring to pull the arm lit in the same direction as that in which the arm moves. The trip gear is;of double acting form, i. e., it

comprisesfa rocking cam 29 made to assume either of two tilted positions by the action of the push rodifi. The cam ZSis turnably mounted on the post 2| byfmeans' of the spindle 3i! and the magnitude of its swing is limited by pegs 3i projecting forwardly from the post 2 l. The rear. end of the spindle 30 is rigid with an arm 32 and the outer end=of this arm is connected by means of a knuckle joint 33 to the lower end of a pushpull rod 34. The top-end of the-rod 34 isconnected by means of a knuckle joint 35 to a countar-weighted arm 36. The arm is rigid with one end of a transverse shaft 3'5, the shaft is borne by uprights 38 mounted on the apparatus and trays or channels 39 equal in number to the number of pumps in the unit (a, Fig. 4) under test are fixed to the shaft 31.

The pumps comprising the unit a are driven by means of a variable speed gear in a housing 40, the output shaft of the gear being indicated by reference 4! and the pump shaft by 42, the two shafts being connected together by a coupling.

. The shaft 4| is provided with a spur wheel and the shaft 4 (Fig; 1) witha corresponding wheel and these two wheels are connected by means of a chain 43. Thus, when the pump is driven the disc 3 is driven simultaneously at a rate determined by the size of the wheels on the shafts 4i and 4 and the reduction ratio of the gear in the housing I.

The outflow pipes, not shown, from the pumps comprising the unit a terminate at injectors: these injectors direct outfiowing oil into the trays 39. When the trays are in the position shown in Fig. 2 they slope towards a sump so that the oil flows into the sump.

When it is desired to make a test the pump is driven by the variable speed gear as already explained, and the handle 25 isdepressed to turn the arm H to the left so that the spring 26 tends to pull the rod I 6 with it. Eventually the projection 5 engages with one of the surfaces 8 or 1, according to the direction of rotation of the disc 3, and through the tooth on the engaged profile, depresses the lever H. The rod SE; is thus depressed to an extent suflicient to allow it to trip past the peak of the projection 44 in the middle of the rocking cam 29 and shortly thereafter the arrangement is such that the projection 5 passes the higher end of the profile. As the profile ends abruptly the lever ii is able to snap upwardly under the action of a leaf spring 45 mounted on the base plate i4. ihis upward movement is imparted to the rod it, the top end of the rod engages with the notch 45 of the cam 29 on the left hand side of the spindle 3i and turns the said cam until checked by the left hand peg 3!. The rod 34 is thus pushed upwardly, the shaft 3"! turned and the trays 39 caused to direct the oil flowing from the injectors into measuring flasks 4! on the apparatus.

When the oil commences to flow into the flasks the operator releases the handle 25 so the spring 22 returns the arm I? to the position shown in Fig. 1. Therefore, the tendency of the spring 26 is to restore the rod It to its initial position.

The trays 39 continue to direct the oilinto the flasks whilst the cam completes one revolution.

Near the end of this revolution it engages with one of the profiles 6 or I and depresses the lever II, the rod l6 under the pull of the spring 26 snaps past the peak M of the'cam 29 and when the lever H snaps upwardly upon the projection 5 reaching the abrupt end of the engaged profile the rod 46 enters the right hand notch 48 of the cam 29 and so causes the trays to tilt to divert the oil from the flasks to the sump.

It will be understood that each test is carried out whilst the disc 3 makes exactly one revolution and the number of revolutions which the pump makes during this time is determined by the ratio of the reduction gear between the shaft 3! and the disc 3. If desired, this ratio may be varied by change speed gearing or the like. The pump may be driven at any required speed but the test is, always pump output during a predetermined number of revolutions.

The

teeth

8, 9 form in effect oppositely acting one way pawls. If the rotation of the disc 3 is clockwise the projection 5 engages with the profile 6 and finally meets the inner face of the tooth 9 to pass this tooth inoperatively, and if the disc rotates in the opposite direction the projection engages with the profile I and displaces the tooth 8 inoperatively, said teeth being held in their cocked positions by a spring joined at its ends to pins 5! on the said teeth.

What I claim is:

1. In an apparatus for testing the output of the pumps of Diesel engines, a timing gear, a springpressed element mounted for pivotal movement adjacent the timing gear, cooperative means on the element and on the timing gear whereby the element is depressed against the action of its spring under predetermined movement of the timing gear, an arm carried by and responsive to element movement, a double-toothed member with which the upper end of the arm cooperates, means for directing oil into measuring flasks, said directing means being connected to and operated by the double-toothed member, the cooperation of the arm with one toothpf the double-toothed member setting an oil delivery means for cooperation with flasks and. in cooperation with the other tooth moving the oil delivery means beyond delivery to the fiasris, and manually operable 'setting means for setting the arm for cooperation with a. particular tooth of the member.

2. In an apparatus for testing the output of the pumps of Diesel engines, means to drive the pumps, means for directing oil from the pumps into measuring flasks, a rotary timing device capable of operating in either direction, a manually controlled setting lever, said timing device operating the oil directing means to cause'oil to flow into the flasks during a predetermined revolution of the pump, a push rod, a lever pivotally connected to the push rod and operated by the timing device to actuate the push rod, means controlled by the lever in one position, resulting from the timing device, to cause the oil to flow into said measuring flasks, the means for operating the lever having two pivoted projections, with one of which the timing device engages in movement in one direction, and with the other ofwhich the timing device engages in movement in the opposite direction, the said lever being aifected by-the operating movements of either of the pumps of Diesel engines, means to drive the pumps, means to direct oil from the pumps into measuring flasks, a timing gear, said timing gear operating the oil directing means to cause oil to flow into the flasks during a predetermined number of revolutions of the pump, a push rod, a lever operated by the timing gear to actuate the push rod, the oil directing means comprising a rocking cam, a manually controlled setting mechanism therefor including an oscillatable arm and a lost motion device connecting the arm to the push rod to permit the pushrod to reciprocate independently of the arm while causing the lever to follow oscillating movements of the arm, the rocking cam, when in one position, preventing oil from flowing into the flasks, and when in another position, permitting oil to flow into the flasks.

4. A construction asdefined in claim 3, wherein the means for operating the lever by the timing gear includes a projection in the timing gear and a pivoted member carried by the lever and having an inclined face with which the gear carried projection cooperates to depress the lever.

LESLIE HARTRIDGE.