FI63490C - BRAENSLEVOLYMMAETARE - Google Patents

Description

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Potent · och regleteretyreleen 'Anteiun uttatd och «i ^ krHtM pubHemd 28.02.83 (32) (33) (31) Pyr» «« y * Tuoik * u * -e ^ ird priork * 05 -09-77

Sweden-Sweden (SE) 7709936- ^ (71) Haldex AB, Box 25Q, 301 OU Halmstad, Sweden-Sweden (SE) (72) Sven Wallqvist, Halmstad, Sweden-Sweden (SE) (7 * 0 Berggren Oy Ab ( 5 * 0 Fuel volume meter - Bränslevolymmätare

The present invention relates to a fuel volume meter comprising a body through which the fuel to be measured flows and having an inner chamber with a fuel inlet and a fuel outlet, and an actuator using the inlet of the labeling and / or recording member for the fuel flowing through the meter body. depending on the quantity.

Fuel volume gauges are used in the fuel supply system of engines of various vehicles. Such meters are used e.g. where fuel consumption is taxable, and in addition where, based on the fuel consumption of the engine per distance traveled or driving time, it is desired to evaluate the condition of the engine in order to decide whether an engine inspection is desirable. Meters are already known in which the volume of fuel can be read directly according to, for example, U.S. Pat. No. 3,805,602. Different ways to connect fuel gauges e.g. for diesel fuel injection systems, explains e.g. U.S. Patents 3,750,463, 3,949,602, 3,817,273 and 3,672,394.

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The aforementioned U.S. Patent 3,805,602 discloses a meter that accurately measures the volume or weight of fuel used per engine unit of time. The gauge includes a piston which is reciprocated by fuel pumped through the engine's fuel pump. This movement is converted into a rotational movement by a cylinder head whose outlet uses a tachometer or the like, calibrated to indicate the volume or weight of fuel used per unit time.

The mechanism of this gauge, which converts the reciprocating motion of the gauge into reciprocating motion, and the valve mechanism, which connects the fuel inlets and outlets to the piston cylinder space to reciprocate the piston, are both mechanically very complex and have a number of disturbance-sensitive details.

The main object of the present invention is to provide a meter of the type mentioned at the beginning which is simpler and more reliable than the prior art.

It is therefore an object of the invention to provide a fuel volume meter which can be made both recording and indicating and which has a very high accuracy in measuring volume over a large flow range, e.g. 0.1-100 l / h. The meter must have a mechanically loaded rotating output suitable for the use of directly readable or stamped counters. The meter does not require particularly narrow manufacturing tolerances, but can be calibrated in a simple way like with a screwdriver. As petrol and other fuels expand by approx. 1.1% / 10 ° C, the meter must be able to compensate for the temperature. In addition, the meter must be able to be used without readjustment for various fuels, such as (non-lubricating) petrol, diesel oil, motor fuel oil and other fuels used or conceivable.

When the meter is connected to known odometers, it must be possible to stamp both the distance traveled and the amount of fuel used. The meter must still withstand severe cold and high heat. It must have a long service life. It must only cause the lowest possible pressure drop in the measuring line.

In addition, it must be tight without complicated sealing arrangements.

3,63490

According to the invention, such a fuel volume meter is essentially characterized in that four pistons are arranged in the body, the fuel to be measured being reciprocated in each cylinder bore, where a cylinder chamber is defined between the piston and the cylinder head, the pistons being connected in pairs. by means of the nipple arm and the two piston rods overlapping at right angles to each other in the inner chamber of the body and each having a central transverse long hole, the valve device being adapted to successively connect with a superimposed roller, each placed in its own long hole and adapted to control the valve device and to change the reciprocating movement of both piston rods min as the rotational movement of the output head.

In order to avoid a shaft projecting through said body and associated shaft sealing problems, according to the invention, preferably the opposite output end of the crank arm of the crank mechanism is provided with a magnetic switch adapted to magnetically transmit the rotational movement of said head to the corresponding input of the stamping and / or recording member.

In order to provide a reliable and simple valve mechanism, the meter body further comprises a suitably flat valve silicon with a central hole connected to the outlet, four second holes arranged around this outlet at 90 ° with the outlet hole in a concentric circle, each leading to its own chamber an additional hole, a circular valve disc having a lower, circular central recess having a diameter greater than the distance between and the distance between said outlet hole and said other holes, and a sealing surface concentric with the recess bordering said valve surface, the crank mechanism and this crank arm is adapted to move the valve disc in a rotational motion about said center so that the outlet hole and the inner chamber of the body are connected in succession through said recesses by four into the hole leading to the cylinder head chamber so that one of the two opposite cylinder head chambers of one pair of pistons is connected to the inlet port and the other is simultaneously connected to the outlet port.

In order to improve the sealing of the valve disc against said valve surface, a pressure spring is suitably arranged between the crank arm and the valve disc, whereby the end of the crank arm passes through this spring and engages the impermeable central bore of the disc. Each of said pistons may consist of a clamping plate fitted to the end of the piston rod and a clamping plate fitted to the cover side of this cylinder and a round rubber film fastened between the two, the edges of which are sealed around the cylinder bore between the outer wall of the body and the round cylinder The rubber diaphragm (17) suitably has holes inside its circumferential edge, by means of which the respective cylinder drilling chamber delimited by the cylinder head and the piston can be connected to one of said valves of the valve device, and the diaphragm in the region between the clamping plate and the cylinder bore wall piston movements are possible.

A preferred embodiment of the invention is further characterized in that the piston rods have, in addition to said central, transverse long holes for calibration purposes, a longitudinal long hole between this hole and the end of the second piston rod, the calibration member being rotated into the body cover in such a position and the end portion can be more or less screwed down into the longitudinal long hole of the second piston rod to adjust the stroke length of the pistons.

The conical end portion of the control member is further suitably connected to the screwed screw on the cover by means of two bimetallic springs surrounded by fuel in the meter body, so that the penetration of the conical end portion into said longitudinal long hole can be varied as a function of fuel temperature.

Alternatively, the calibration means may be at least one adjusting screw attached to the cylinder head, the free end of which is arranged so that it can collide with the piston in question and act as an end response for limiting the stroke length of the piston.

63490

In order to reduce friction losses, the magnetic coupling is suitably a magnetic ring attached concentrically to a holder made of e.g. plastic, attached to the outlet end of the crank mechanism and having a protrusion in the center of the opposite side which low friction rests on the lower ring of the upper part of the body. and / or a corresponding protrusion is formed on the respective magnetic switch of the registration member, which rests on the upper or outer surface of the sealing ring directly in front of the first-mentioned protrusion.

The invention will be explained in the following by means of exemplary embodiments shown in the accompanying drawings.

Fig. 1 shows the fuel flow section of the meter and, more specifically, its body, which is e.g. light metal, in section A-A in Fig. 2, which in turn shows section B-B of Fig. 1. Figure 3 shows the motion transmission components of the meter body. Figures 4-6 show a top view of the piston rubber film and a diagonal section, respectively, with Figure 5 showing the detail of the film edge on a larger scale. Figure 7 shows the cover of the meter body in cross section. Figures 8 and 9 show a second simplified meter body cover seen from below and in a diametrical section, respectively. Figures 10 and 11 show sections corresponding to Figures 1 and 2 of a simplified meter body. Figures 12-14 show a side view, a top view and a side section, respectively, of the piston rod. Figures 15 and 16 show two crossed, simplified piston rods in side section and seen from above, respectively. Figures 17 and 18 show a circular planar valve disc in a diametrical section and seen from above, respectively. Fig. 19 is a top view of the body with the sealing surface of the valve disc marked in slashes. Fig. 20 shows a top view of the pressure spring of the valve disc. Figure 21 is a side view of the meter body. Fig. 22 is a fragmentary view of a meter body connected to a card printing unit according to Swedish patents 336,920 and 354,370. Figures 23-26 show piston rods for explaining meter adjustment. Figures 27, 29 and 30 show different ways of connecting the meter to the engine fuel supply system. Figure 28 shows a known fuel supply system for a diesel engine. Figures 31 and 32 illustrate automatic temperature compensation of the meter. Figures 33 and 34 show a pointer unit for connection to the body of the meter flow section to replace the card weighing unit of Figure 22.

The fuel gauge according to the invention comprises a volume gauge part consisting of a four-cylinder "star engine arrangement" with a level slide for flow control. The level slide is spring and pressure loaded, and the more the meter is mechanically loaded at the outlet, the greater the pressure difference between the inlet and the outlet and the more the level slide presses against its opposite sealing surface.

The fuel gauge body 13, shown in Fig. 1 as a center section along the line AA in Fig. 2 and in the latter figure as a cross-section along the line B-B in Fig. 1, comprises four pairs of opposite cylinder bores 80 and 82 and 82 and 83, respectively. seen from above in Fig. 2 a square solid base 133, the upper surface of which acts as a valve surface 134. This base has four pairs of opposite bores 70-73 and a central bore 135. The latter is connected to a fuel outlet 12. In addition, a left bore 136 is connected to the left at the bottom of the left cylinder bore 82. to the inlet duct 11, which in this way becomes connected to the interior of the body 13. Boreholes 70-73 are located at a 90 ° division in a circle centered on the center of the central discharge bore 135. Each bore 70-73 is connected to the annular channel around the respective cylinder bore in each side wall of the body by cross-bores 9, 10 of the part 133. In the present example, two such cross-bores 9 and 10 are shown as starting from bore 71, and cross-bores starting from other bores 70, 72 and 73 are indicated in Fig. 2 only by their dotted center lines 137.

Figure 1 shows a circular planar valve plate or disc 20 sliding on a surface 134. This disc houses a valve spring 18 with a central opening 44. The function of the valve disc 20 in cooperation with the openings 135 and 70-73 is explained in detail below in connection with Figures 10, 11 and 19.

The fuel inlet 11 and the fuel outlet 12 each have their own screwed-in connecting nip 14, of which only the nipple of the 63 6390 7 outlet is shown in Fig. 2.

Other details shown in Figures 1 and 2 include a cylinder head 1 with an annular groove 2 and a second annular groove 90.

These grooves are connected to each other by four bores or holes 3. A rubber film 17 is pressed between the cylinder head 1 and the wall of the opposite body, partially attached to the end of the piston rod 8 shown and pressed between the tension plate 15 on the piston rod and the tension plate 16 74 protrudes to the right in Figure 2. It will be appreciated that the other three cylinder bores at the top, bottom and left in Figure 2 have corresponding arrangements not shown, comprising a piston rod, a piston cover and a rubber diaphragm. At the top, Figure 1 shows an O-ring 24 which seals against a cover to be explained later. The pistons discussed herein are diaphragm pistons designed to easily prevent leakage around the pistons. It is clear that a conventional piston type with a suitable rubber lip seal could be used instead of diaphragm pistons.

Figure 2 shows how said diaphragm pistons work. The cylinder cover 1 abuts the edge of the membrane, which seals both inwards and outwards. The holes at the edge of the diaphragm (cf. Fig. 4) connect the annular groove of the body 85 to the groove of the cylinder head and provide a connection between the cylinder bore 80 and the hole 70. The membrane 17 forms a corrugation around the clamping plate 16, and the fuel pressure on the inside of the body 13 keeps it bulged. As the piston reciprocates, the diaphragm rotates toward the inside of the cylinder head and the outside of the clamping plate. Thus, there is no friction, but only some kind of "kneading" of the film rubber around the tension plate.

Figure 3 shows the parts of the motion-transfer mechanism of the fuel gauge according to the invention. Starting from above, a sealing ring 5 is shown, which is the uppermost part of the flow-through part of the meter. Below this is shown a magnetic switch, generally indicated by reference numeral 7, which includes a central magnet holder 19, e.g. nylon. This holds the magnetic ring 28, which is e.g. ferrite, and rests on the lower surface of the ring by a projection 138 so as to rotate in this respect, and has a hub 47 in which the sleeve part 139 of the disc part 45 with a vertical wall 45 is placed. The magnetic ring 28 is fixed to the wall 45 between the upper edge flange 46 and the step 8 63490 140 of the disc portion 29. The wall 45 is suitably provided with vertical slots (not shown) to facilitate attachment of the magnetic ring 28.

A rectangular pin 34 is located in the central impermeable square bore 30 of the portion 29 at the end of the crank unit generally indicated at 35. The crank unit consists of a crankshaft 32, a crankshaft 31 integrally connected thereto, and an eccentric with a crankshaft in more detail in Figure 7, is indicated by reference numeral 6 and has a hub 48 in which the crankshaft 32 can rotate in the upper sleeve 21 and the lower sleeve 22. The detachable plate 141 is located between the sleeve 22 and the crankshaft 31. The upper arm 36 and the lower roller 37 are mounted on the cam arm 33.

These rollers are placed in the holes in the piston rods 8, as will be explained below. A conventional U-shaped spring lock, indicated by reference numeral 84, holds the rollers in the spring arm 33. The end pin 49 can rotate in the bore 51 of the hub 50 of the flat valve disc 20, the flat valve disc having a circular central recess 53 and resting on its lower surface. a control cone can be screwed onto the second hub 60 or sleeve portion, the operation of which will be explained later.

In connection with Figures 1 and 2, said rubber film 17 is shown in detail in Figures 4-6. The membrane has a central hole 54 through which the screw 25 of Figure 2 passes, a base 55, a sloping membrane wall 56 and a peripheral edge 57. This edge has an edge flange 59 and a plurality of holes 58.

The already mentioned cover 6 is shown in cross-section in Fig. 7. It has holes 67 for attaching it to the body 13 and holes 68 for attaching the recording, indicating and / or marking part of the meter according to the invention to be described later. The cover recess 142 has a sloping wall 63, a base 62 with two through holes 61 (only one of which is shown) and the aforementioned hubs 48 and 60 with holes 65 and 66, respectively. A 0 ring 23 which seals against the sealing ring 5 ( Fig. 3), is located on the protrusion 64 around the circumference of the recess 142.

Figures 12-14 show one of the two identical piston rods 8 in the fuel flow section of the meter according to the invention. The clamping plate 15 is attached to each end of the piston rod, e.g. by spot welding it to the bent part 143 at each end of the rod 9 63490. The portion 143 has a recess 145 and at the end of the shaft there is a recess 144. The plate 15 is provided with a central screw hole 69. The piston rod further has a longitudinal long hole 26 and a central long cross hole 27 for purposes to be explained later.

The flat slide disc or valve disc 20 shown in Figures 17 and 18 is a circular plate of nylon or other suitable material having a circumferential edge flange 52 and, as already mentioned, an impermeable central bore 51, a hub 50 and a circumferential sealing surface 146. It is shown from above in Figure 18.

The valve spring 18 is shown from above in Figure 20, comprising three legs 75-77 bent downward along bend lines 79 and provided with a central hole 44. The ends 147 of the legs are intended to rest on the inner wall of the flange 52 of the valve disc 20 (Figure 17) to press for sealing contact against the sealing surface 134 (Fig. 1). The spring is suitably a spring material.

Figure 21 is a side view of the inlet end of the body. The wall has a screw hole 88 for fixing the cylinder head 1. In addition, an inlet 11 and bores 9 and 10, already mentioned above, are shown. Reference numeral 87 denotes the side wall of the base 133 of the body. The cylinder bore is surrounded by a circular shoulder 86 and a circular groove 85 inside it and a stop edge 89 inside it.

Fig. 22 is a partial view of, for example, a bag printing device according to Swedish patents 338,920 and 354,370, which is mounted on the flow section of a fuel volume meter according to the invention. The stamping device is indicated by reference numeral 39 and its rotatable cover by reference numeral 120. The stamping device is fixed to the cover by means of a column with a nut 127 screwed to its end. The body is shown partly with its cylinder cover 1 and sealing ring 5 and magnetic coupling 7 attached to it.

Arranged in the center of the bottom of the stamping device is its input shaft, in which a stallion end square pin 126 and a fixed collar 125. A bearing plate 122 is fixed to said bottom. A detachable plate 123 is fitted to the shaft and is held in place by a U-lock 124. the rotation of the rotating output shaft of the backing part is avoided, its rotational movement is magnetically transmitted, i.e. the movement of the unit 7 is magnetically transmitted through the sealing ring 5 (which is of course non-ferromagnetic material) to the magnetic ring 149 of the input shaft of the mechanism 39.

Figures 33 and 34 show a variant with an indicative volume meter for connection to the flow section of the meter according to the invention.

Viewed from above, Fig. 33 shows that this counter, i.e. the pointer unit 40, has a scale 43 with a pointer 42 and a calculator 41. The side view of Fig. 34 shows that the unit has a mounting post 91 for mounting similar to the unit 39 shown in Fig. 22 and a threaded end 103. 95 is a magnetic plate 94 which cooperates with a magnetic switch 7. The shaft 95 is mounted on a bearing 99 of the calculator housing 102 and is provided with a gear 98 which engages the gear 101 on the pointer shaft 100. a transfer wheel 93 cooperating with the toothed rings located on the respective calculator wheels 106 except for the far right wheel which is toothed on the drive wheel 92 fixed to its own shaft 104. At the opposite end of this shaft is a corresponding gear 151 which is toothed on the shaft 95 to the end screw screw 150, whereby the movement of the input shaft 95 is transferred to the calculating device 41.

Figures 8 and 9 show a simplified embodiment of a cover 6 attached from a seal to the meter body 13. The output shaft (crankshaft 32) is mounted on this cover and has, as before, two easily movable rollers 36, 37. Figures 10 and 11 show the body 13 in section C-C and D-D, respectively, in a simplified embodiment adapted to the cover 6 of Figures 8 and 9. Figures 15 and 16 show two piston rods 8 for this embodiment, and Figures 17 and 18 show a respective planar valve disc 20. Figure 19 shows a top view of a body 13, 63490 11 with the contact surface 146 between the disc 20 and the valve surface 134 marked in diagonal lines, both surfaces are exactly flat and smooth. The plate or slide disc 20 of Figure 19 has a structure adapted to the embodiment of Figures 1-2.

The mode of operation of the plate or disc 20 in conjunction with the bores or holes in the valve surface 134 is as follows: the pin 49 (Fig. 3) is located in the hole 51 (Fig. 17) of the valve disc 20 and the hole 44 of the valve spring 18 (Fig. 1). This spring then presses the disc 20 against the valve surface 134. When the valve disc 20 with its contact surfaces 146 covers the holes 71 and 72 of Figures 10 and 11, the hole 72 above the recess 53 in the disc 20 is connected to the outlet hole 135. The inlet hole 136 is connected to the hole 70 via the inner chamber of the body 13. If the crankshaft 31 is rotated 1/4 turn counterclockwise (to the position of Fig. 19), the holes 70 and 72 are closed and the outlet hole 135 is connected to the hole 73, in addition to which the hole 71 is connected to the fuel inlet.

Continuous rotation results in the one-turn inlet 136 of the disc 20 being connected in turn to the holes leading to the cylinder bores 80, 81, 82 and 83, while the outlet hole is connected to the cylinder bores 82, 83, 80 and 81, respectively. the extreme positions to the left, right, bottom and top intermediate positions between the gradually open up the connection to the cylinder chamber, which is next in line to open fully, and the same is true with respect to the exhaust side. The pistons of the cylindrical boreholes then slide in pairs, since these pistons are connected in pairs by two cross-piston rods 8 with a transverse groove 27 in the middle, which grooves intersect (Fig. 16) so as to form an opening for the rollers 36, 37 (Fig. 16). 3), which rotate freely on the crank arm 33 and which are thus freely operated by the corresponding piston rod.

The pressure from the inlet 136 to the chamber 80 pushes the piston pair in the chambers 80 and 82 to the left in Figures 10-11. At this time, the chamber 82 is emptied into the opening 135. At the same time, a force applied to the left acts on the upper roller 36 of the crank arm 33. The crank wheel 31 and the crank arm 33 and both rollers 36, 37 begin to rotate counterclockwise. The valve disc 20 participates in the movement of the crank arm 33 and gradually opens the inlet to the chamber 81 and the outlet of the chamber 83. The pair of pistons 81, 83 6 3 4 90 12 then move downwards and press the lower roller 37 with their piston rod 8, so that counterclockwise rotation continues in this way.

The load taken from the piston rods 8 is only so great that it overcomes the friction of the disc 20 against the valve surface 134 as well as the load required, e.g., for the magnetic operation of the calculator by means of the output shaft. The frictional forces of the pistons and the flow resistances of the different channels are completely balanced by the forces present in the piston rods and the difference between the inlet pressure and the outlet pressure without loading the crankshaft 31 and its bearings.

In Fig. 19, reference numeral 129 denotes a position of the outer circumference of the disc 20, reference numeral 130 denotes a position of its inner circumference, and reference numeral 131 denotes a position of the center of the disc.

The adjustment or calibration of the meter will be explained with reference to Figures 23-26, in which Figure 26 is a sectional view of a piston rod 8 with an end clamping plate 15 for a rubber diaphragm, a transverse long hole 27 and a longitudinal long hole 26, crankshaft end 32, crankshaft 31, crankshaft 33 and rollers 36, 37 and the adjusting cone 4, whereby the adjusting screw 148 is placed in the longitudinal hole 26. In Figs. 23 to 25, the piston rod 8 is shown from above.

If the rollers 36, 37 fit well into the cross-holes of the piston rods, the amount of fluid flowing through V per revolution of the shaft is: 2 V = 4x2xrx - ~ - 4 where the number 4 denotes four pistons, 2r denotes a stroke equal to twice the palm radius r, and the last term is the piston area (D = piston diameter). Then V = 2π r D2 is obtained

Logarithmization gives

In V = In 2π + In r + 2x In D

Derivation gives dV _. jdr ^ 2dD v "" 0 + - + - 13 63490

It is obvious that a tolerance of 1% in the radius of the palm (e.g. r = 4; dr = 0.04; dr / r = 1/100 = 1%) gives dV / V = 1% and thus a tolerance = 1 for the measured volume %. A tolerance of 1% in the diameter of the piston (eg D = 38; dD = 0.38; dD / D = 1/100 = 1%) gives dV / V = 2% and thus for the measured volume = 2%. If both r and D have a tolerance error of 1%, an error error of 3% can be obtained. The volume per revolution is adjusted to its set point Vg rather than tightening the tolerance requirements. The meter must therefore have a calibration option.

Calibration is performed as follows:

The stroke length of the second pair of pistons is adjusted to deviate from 2r (see Figures 23-24).

In Fig. 23, the diameter of the roll and the width of the cross hole are both equal to d. The length of the stroke becomes 2r.

In Fig. 24, the diameter of the roll is reduced to d ^. The piston rod can then increase its stroke length beyond the previous value of 2r. The increase becomes equal to the clearance between the hole and the small roller. Thus, the maximum stroke length becomes = 2r + (d - dx). The piston rod also travels from the inlet of this distance under the pressure applied to the piston. After the corresponding end position, the crossed piston rod carries the crankshaft and rolls its "normal size" counterclockwise. When the angular position marked with solid lines in the figure is passed, the valve disc 20 directs the inlet pressure to the cylinder 82 and the piston rod moves to the right and acts on the small roller only when the clearance d-d1 is used. The diametrical end position is shown in broken lines in Figure 24.

In Fig. 25, the stroke length and clearance are instead reduced, giving the minimum stroke length = 2r - (d - d1).

63490 14

In this case, as in the previous case, the level valve disc 20 and the crossed piston rod take care of moving over the end position marked in solid lines in the figure.

The up and down rotatable adjustment cone 4 runs in the longitudinal slot 26 in the second cross-piston rod and adjusts the length of the stroke. When the cone is twisted up (Fig. 24), the end of the slit hits the narrow end of the cone 0 ^. The maximum stroke length becomes S = a + 0 - 0.

max ^

When the cone 4 is twisted down (Figs. 25-26), the end of the longitudinal slot hits the wide end of the cone 0. The smallest stroke length becomes S = a.

min

It is therefore necessary to take care of that

Smax "a + 18 - * 1 = 21 + <d * dl> ja

Smin = a = 2r - (d - d,)

If the height of the cone (cone angle) is then adjusted according to the pitch of the thread and the lengths and diameters of the stroke are taken into account, it can be achieved, for example, that the rotation of the cone by one revolution corresponds to a volume change of 1% per revolution.

Calibrating the meter is then extremely simple. Start with the cone in the center position and run the meter through a carefully measured volume. If the connected instrument shows more than the measured volume, eg 1.5% too much, the control cone must be turned up one and a half turns. Namely, the volume must increase by 1.5% in order for the indicated volume to correspond to the actual volume. Although there is nonlinearity around a round, each full round still corresponds to a given volume.

As an alternative to the adjusting cone 4, an adjusting screw 78 could be used in the cylinder head 1, which acts against the piston clamping plate 16 to limit the length of the stroke (Fig. 11).

63490 15

Figures 31 and 32 show a side and top view, respectively, of a device for automatic temperature compensation in a meter according to the invention.

The adjusting cone 110 of the type of adjusting cone 4 of Fig. 3, which is adapted to engage e.g. The upper bimetallic spring and thus the cone 110 can be adjusted by the adjusting screw 107. The bimetallic springs 108 are embedded in the fuel of the meter. Arrow 111 indicates the movement of the cone as the temperature rises.

The fuel expands at a temperature of approx. 1.1% / 10 ° C. If the fuel tank is filled with fuel with a temperature of + 10 ° from the ground tank and the fuel is consumed at + 30 ° C, the fuel gauge shows that the volume consumed is (30-10) x 1.1 = 2.2% greater than the refueled volume. For example, the temperature compensator according to Figures 31-32 is therefore suitably arranged so that a complete match is obtained between the volume refueled at one temperature and the volume consumed at another temperature. The weight of the fuel when refueling and consuming is the same in both cases, so the fuel gauge can be said to be "weight adjusted".

In connection with Figures 27-30, various ways of connecting the fuel gauge to fuel supply systems will be discussed.

Fig. 27 shows a fuel gauge 113 connected to the fuel supply system of a gasoline car engine. The gauge is connected to the fuel line between the gasoline pump 115 and the carburetor (arrow 118), alternatively before the pump 115 (shown in dashed lines). The petrol tank is marked with reference number 114.

Figure 28 shows a normally connected fuel supply system for a diesel engine without a fuel gauge according to the invention. Fuel flow is indicated by arrows in the lines. Arrow 119 indicates the direction of supply to the engine, and reference numeral 116 denotes an injection pump.

63490 16

In automotive diesel engines, connecting the fuel gauge is not as simple as in the gasoline engine of Figure 27. Namely, the diesel engine has two pumps, i.e. a feed pump 115 and an injection pump 116. The injection pump is controlled by the engine load and speed. Fuel that is not used for injection usually returns to the fuel tank. The feed pump has overcapacity and fuel that is not taken up by the injection pump also returns to the tank. Fuel that has been pressurized in the pumps is heating up. This fuel is suitably cooled by returning it to a tank blown by the headwind.

Figure 29 shows the simplest connection of a fuel gauge according to the invention to a diesel engine. In this case, however, no cooling is obtained from the return fuel, which is probably desirable because the diesel engine appears to lose its power if it is run on heated fuel.

Fig. 30 shows another connection method in which the cooling fuel passes through the cooling coil 117 in the tank 114 and arrives cold in the T-tube after the fuel gauge. In such a case, the meter 113 is loaded with warmer fuel, which is probably advantageous because there may be a risk of precipitation of heavier oil fractions in the cold diesel fuel, which may stop the fuel flow. The cooling coil 117 can be replaced by a separate cooling tank where the return fuel air bubbles can be separated.

The advantages of the fuel volume meter according to the invention are its structural simplicity, its easy adjustment by means of a screwdriver, its rotating output movement which can be connected to a magnetically marking or indicating unit calculator, the possibility of measuring very small fuel flows, no mechanical outlet passing through the body, seals, reliable sealing of the body against fuel leakage, large possible tolerances in the manufacture of meter components, its temperature compensation, its usability for different fuels, the possibility of combining the meter with the means of indicating and recording the distance traveled by the actual vehicle, etc.

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Claims (4)

A fuel volume meter, comprising one of the fuel to be measured through the housing (13) forming an internal chamber with fuel inlet and carrier outlet and a drive for driving the input of a tuning and / or recording means in response to the fuel volume flowing through the meter housing, and four pistons are arranged in the housing (13) to be driven in a forward and reverse motion of the fuel to be measured, in each cylinder barrel, within which between each piston and a cylinder top (1) a cylinder chambers (80-83) are delimited, the pistons being connected in pairs firmly by means of a common flat piston rod (8), and. the two piston rods in superposed relative relation perpendicularly intersect within the inner chamber of the housing and each has a central transverse longitudinal tail (27), and that a valve device is required to successively refine the respective chamber (80-83) with the fuel inlet (11) and the respective resistor with the fuel outlet (12), and 63490 that a crank mechanism has its crank length (33) provided with two freely rotatable, mutually stored rollers (36, 37) inserted into each of said long heels (27) and arranged to control the valve arrangement and converting the reciprocating movement of the two piston rods (8) to a rotary movement of the output end of the crank mechanism, characterized in that the housing (13) comprises a valve valve surface (134) with a central, communicating heel (12) with the outlet (12). 135), four about this heel with 90 ° pitch on a second heel (70-73) arranged with the outlet heel (135) concentric circle, each leading to each of said chambers (80-83), outside the valve surface (134) of the inner chamber of the housing from the inlet (11) conductive shark (136), a circular valve plate (20) with a lower circular central recess (53) of a diameter greater than the distance between the outlet hull (135) and the aforementioned the second heel (70-73) and their mutual spacing and having a sealing surface (146) with the recess (53) abutting against the valve surface (134), the center of rotation of the crank mechanism coinciding with the center of the outlet heel (135) and its crank length (33) is arranged to drive the valve plate (20) in a circular motion about said center to gradually connect via said recess (53) the outlet heel (135) and the inner chamber of the housing with the four heel (70-83) leading to the cylinder top chambers (80-83). 73) in such a manner that of the two opposing cylinder top chambers of a piston pair one (e.g. 80) is connected to the inlet (11) and the other (eg 82) is connected to the outlet (12). Meter according to claim 1, characterized in that a compression spring (18) is arranged between the crank length (33) and the valve plate (20), the crank length end (49) passing through this spring and engaging a central blind bore (51) in the plate (20). . Meter according to claim 1, characterized in that the piston rods (8) in addition to said central, transverse longitudinal heel (27) between this heel and one piston rod end have a longitudinal longitudinal heel (26), that an adjusting and calibrating means (4) is screwed into the housing. lid (6) in such a position and with such length that a free conical end portion of the member in question can be more or less screwed down into the longitudinal longitudinal heel (26) of one piston rod (8) in order to adjust the stroke length of the piston.