DE2814758A1 - INJECTION INTERNAL COMBUSTION ENGINE WITH AUTOMATIC STOP FOR QUANTITY CONTROL - Google Patents

Description

Injection engine with automatic stop device for volume control

The invention relates to an internal combustion engine with an injection pump having a quantity control element, a full load stop which limits the full load quantity during operation and is assigned to the quantity control element can be switched off to start the machine in order to set the quantity control element to a start position with maximum injection quantity to be able to.

In known stop devices of this type, the full-load stop is usually started by hand by means of a start filling button or brought out of the adjustment path of the quantity control element via electromagnetic actuation by means of a lifting magnet, in order to be able to bring the same to the maximum injection quantity. However, such starting devices are very disadvantageous. Apart from that from an expensive structural effort caused by Bowden cables or rods between the control station and the stop Disadvantage is that in one IPaIl the manual operation of the Forgot the start filling button and otherwise an electrical device is unusable on machines with a hand crank start because there is no power source available in the rest position stands.

It is the object of the present invention to eliminate these disadvantages of the known types and to provide an anchor device to create which can be used in the same way for all machine types · This object is achieved in that the full load stop is movably arranged and by a restoring force in the rest position of the machine outside of the movement

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is held away from the quantity control member, and that during the After the start of the increasing machine speed, the full load stop is exposed to increasing pressure in the machine which brings it against the action of the restoring force in the movement path of the quantity control member.

In the preferred embodiment of the invention, the Full load stop connected to a piston on the one hand a return spring and on the other hand the one in the lubricating oil circuit prevailing oil pressure acts on the machine. The full load stop can be designed as a stop rod on the circumference has a fixed stop surface for the quantity control member. Or the piston can carry a stop rod, the end of which is connected to one that interacts with the quantity control element Compensating spring is surrounded by the full load stop in its for the quantity control member forming the circumferential area by slight Compensation amount can be pressed against the stop rod.

A particularly advantageous embodiment results when the full load stop, its piston, the return spring and the oil pressure chamber is accommodated in a rotatable sleeve, the piston axis being eccentric to the axis of rotation the rifle lies. In this way, the relative positions of the stop with respect to the can by rotating the sleeve Quantity control element can be adjusted.

In the following description, exemplary embodiments of the invention are explained with reference to drawings. Show it:

1 shows the rest position of the stop device in longitudinal section and the associated injection pump in cross section,

Fig. 2 + 5 two different positions to Fig. 1,

Fig. Ί + 5 some elements of another anchor device in different positions.

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1 shows some elements of a single-cylinder injection pump of known type and mode of operation. In the housing 10 is a Piston sleeve 12 mounted immovably, in which a piston 14 in is guided reciprocally in its longitudinal direction. An externally toothed pinion 16 is rotatable on the circumference of the piston liner stored, which is coupled to the piston to rotate. By turning the pinion, the piston turns around its longitudinal axis rotated and, via its control edge, the amount of injection fuel supplied by the piston for a not illustrated single-cylinder injection internal combustion engine regulated. A rack that can be displaced in the housing 10 transversely to the piston axis 18 works together with the pinion 16, whereby a clutch? pin 18k of the rack 18 protrudes from the housing 10 and is coupled to a regulator lever 20. This regulator lever is mounted in a known manner in such a way that it is in one direction to the piston 14 · and rack 18 parallel plane its pivoting movements can perform, which are indicated in Figure 1 with an arrow. The regulator lever is usually called a double-armed, in its center mounted lever executed in a known manner on the one hand via hand or foot controls by the operator and on the other hand additionally from a speed controller, e.g. Centrifugal governor can be influenced. The ones with "L", "V" The control lever or the rack takes the positions marked "S" when the machine is idling, at full load and when the machine is started a.

A housing 24 is attached to a wall 22 of the machine, in which a sleeve 26 is stored. In one to the longitudinal axis of the

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Bushing 26 eccentrically arranged bore 26a, a piston 28 is slidably mounted and fixed with a stop rod 30 tied together. One end 30a of this rod cooperates with a locking screw 32 which closes the bore 26a. The other end 30b of the rod forms a stop which can be introduced into the path of the regulator lever 20.

The one formed between piston 28 and screw plug 32 Space A of the bore 26a serves as a pressure chamber in which, through the transverse bore 26b of the bushing 26, the bores 24a of the device

housing 24 and the through opening 22a in the wall 22 the Oil from the lubricating oil circuit is supplied to the machine. The pressure in working space A increases and thus decreases accordingly the pressure prevailing in the lubricating oil circuit.

A return spring 34 is between the sleeve 26 and the piston arranged and strives to move the piston 28 together with the stop rod 30 to move downward (as shown in the drawing) until the end 30a rests on the screw plug 32.

The rest position of the stop device is shown in FIG. There is no pressure in working space A, so that the return spring 34 returns the piston 28 and the stop 30 downwards, the stop end 30b coming to lie outside the path of the governor lever 20. You can use the control lever to start of the machine up to position "S", which determines a maximum injection quantity. As soon as the machine is started, As the machine speed rises, so does the pressure in the machine's oil circuit and consequently also in the working area A, whereby the elements 28 and 30 against the force of the

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Spring J4- can be adjusted upwards. If the regulator lever 20 has not yet been withdrawn from its starting position "S" to position ¹¹ V "or below, the end of the stop 30b remains temporarily on the side surface of the regulator lever 20 (FIG. 2) between "V" and "L" the stop rod 30 can be brought past the regulator lever 20 under the action of pressure further upwards until its stop end 30b protrudes fully into the path of the regulator lever 20 (FIG. 3). The peripheral surface of the end 30b then forms the stop for the regulator lever 20 in position "V". The piston 28 rests with its end face 28a on a collar face 26c of the bushing 26.

A second embodiment is shown in FIGS. 4 and 5. The end 30bb of the stop rod 30 is by a small amount tapered and surrounded by a stop spring 36, which is in a Circumferential groove 30c of the rod 30 is tight. In this design, the outer surfaces of the spring coils form the full load stop "V", as Fig.4 shows. The spring 36 is so strong that the Withstand the pressure exerted by the governor lever 20 during normal operation.

In special operating cases, e.g. when driving a mountain When the vehicle is driven by the internal combustion engine, excess force is exerted on the centrifugal governor at low speed free, which acts on the regulator lever 20 and is sufficient to overcome the lateral rigidity of the stop spring 36. The regulator lever 20 then pushes the stop spring 36 over a slight adjustment path "W" laterally to the circumference of the

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End 30bb of the stop rod 30 (Fig.5), so that the regulator lever 20 without adjusting the stop rod 30 by a slight Amount beyond the full load position "V" is brought into a special position "G". There will be more injection quantity and higher torque is achieved at lower speed.

On the circumference of the sleeve 26 longitudinal grooves 26d are machined in order to be able to rotate the sleeve 26 and the elements carried by it by means of an auxiliary tool which engages in the grooves. As a result of the eccentric arrangement of the stop rod 30 in the sleeve 26, the relative position of the stop ^ Qib or 36 to the regulator lever 20 can be adjusted, so that the full load position can be finely adjusted.

A cap 38 is with its inner projections 38a in the Grooves 26d can be used in order to be able to cover the screw plug 32 and the sleeve 26.

The pressure in the machine's lubricating oil circuit increases the start with increasing speed and up to a level then kept constant by control valves. These However, the proportionality between the engine speed and the lubricating oil pressure given during the start phase is sufficient to to ensure that the anchorage device is automatically influenced.

Finally, it should be mentioned that the pressure, which increases with increasing speed, also occurs in other units the internal combustion engine, e.g. cooling air fan, turbocharger or cooling water circuit, can be used in the same way could to control the anchor device.

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Claims (5)

Engine factory FIa ti. 5.4.1978 GmbH & Co. KG. ^H ~ ⁵ ^ 8099 Rulioor 2 ft 1 L 7 ^ ft Claims: * Q | H / 30 Injection internal combustion engine with a flow control member having the injection pump, wherein the flow control member is associated with a full-load stop, which the full-load quantity during the operation is limited and suppressible for starting the engine ₁ is to be able to adjust the flow control member to a starting position with the maximum amount of injection, characterized in that the full-load stop (50b, 36) is movably arranged and is held by a restoring force (54-) in the rest position of the machine outside the path of movement of the quantity control element (20), and that while the machine speed increases after the start, the full-load stop is subject to an increasing pressure in the machine ( A) is exposed, which brings him against the movement of the restoring force in the movement path of the flow control member. 2. Injection internal combustion engine according to claim 1, characterized in that that the full load stop (30b, 36) with a piston (28) is connected, on the one hand a return spring (34) and on the other hand, the oil pressure (A) in the machine's lubricating oil circuit acts. 3. Injection internal combustion engine according to claim 2, characterized in that that the full load stop (30b) is designed as a stop rod (30) which has a fixed stop surface on the circumference for the quantity control member (20). 4. Injection internal combustion engine according to claim 2, characterized in that that the piston (28) carries a stop rod (30), the end (30bb) of which interacts with the quantity control element (20) Compensating spring (36) is surrounded, which in its full load stop for the flow control member forming circumferential be- 809841/0323 ORIGINAL INSPECTED 28U758 rich by a small amount of compensation (W) against the stop rod can be pressed. 5. Injection internal combustion engine according to one of the preceding claims, characterized in that the VoILa st stop (30b, 36), its piston (28), the return spring (3-4-) and the Oil pressure chamber (A) are housed in a rotatable sleeve (26) in such a way that the piston axis is eccentric to the axis of rotation the rifle lies. 903841/0323