EP0786047B1 - Device with fuel injection and with a lubricant-supply unit for internal-combustion engines - Google Patents

Description

field of use

The device with fuel injection and Lubricant delivery device for internal combustion engines can be used wherever a compact arrangement to be created for such a device, preferably with a chainsaw with several, if necessary also adjustable lubrication circuits and one Fuel delivery with higher pressure.

The invention relates to a device Fuel injection and lubricant delivery system for internal combustion engines, preferably for Hand-held tools, such as chainsaws, with one on a crankshaft arranged or indirectly through the Crankshaft driven helical gear with a Counter wheel for driving the lubricant pump in engagement stands, with a piston of the lubricant pump one Bearing pin for the counter gear forms and one has frontal inclined surface against a Housing is held by an adjustable lifting pin, what about the flow rate of the lubricant pump is adjustable.

State of the art

Hand-held chainsaws have been used for lubrication the cutting chain is mainly controlled without valves Piston pumps proven. The oil pump in question has a cylindrical formed in a pump housing Pump chamber with one inlet opening and one Outlet opening and one in this pump chamber formed by a helical gear and a counter gear Gear rotatable pump piston on one Side is resiliently supported and on the other side has an end sloping surface that against an eccentric to the piston longitudinal axis Lift pin rests so that when the piston rod rotates an axial movement is generated which is used for pumping is exploited. The axially adjustable stop lets set different stroke of the pump piston. This lubricant delivery device is mostly as Auxiliary unit block together with the fuel injection flanged to the internal combustion engine.

DE 37 35 711 A1 is a portable one Two-stroke powered, manually controlled Tool, such as a chainsaw or the like, with a pneumatically driven injection pump for Inject fuel and an intake manifold for the Combustion air and a low-vibration Handle housing for carrying and guiding the implement known in which the injection pump separately from Two-stroke engine is arranged in the handle housing and over flexible connections with the two-stroke engine in Connection is established.

DD-PS 41 648 are lubricant pumps for Internal combustion engines are known, the two in a row arranged, rotating piston conveyor units exhibit. These lead to the constant stroke of one Engine speed of high reduction gearbox out. The first delivery unit supplies the lubricant and the second the fuel. Both media will mixed fed to the internal combustion engine, which as Two-stroke engine is executed.

Task, solution, advantages

It is an object of the present invention to compact arrangement for the aforementioned To create device, preferably at a Chainsaw with several, also adjustable if necessary Lubrication circuits and a fuel delivery with higher Print.

This object is achieved by the one specified in claim 1 Device solved. It is provided that the Helical gear meshes with two counter gears, each with a drive shaft for each a lubricant and / or a fuel pump connected is. With this device the Fuel injection and / or lubricant delivery systems effectively combined in the smallest space, the crankshaft being used as the drive element.

Further developments of the device according to the invention described in the subclaims. So they can common through the crankshaft over that from the Helical gear and the counter gears existing gear driven drive shafts for the lubricant and / or fuel pump in parallel or be V-shaped to each other. in the this can be essential for the person concerned Device as an auxiliary unit most favorable shape design to be selected.

According to a first embodiment variant of the invention Device is one of the counter wheels on both sides one lubricant feed unit each, preferably the two conveyor units of a lifting disc on one of the conveyor units are drivable. It already serves as the lifting disc called front oblique surface of the piston rod. Around different through the mentioned conveyor units They have the ability to transport production quantities Conveying units for the lubricant of different sizes effective piston areas. Preferably the other drives Counter wheel in this case the fuel pump, the is also designed as a plunger pump.

Alternatively, one of the counter wheels can be on both sides one conveyor unit each, one of which of these funding units as continuously working Fuel pump and the other feed unit one in the flow rate is adjustable lubricant pump. The easiest way to adjust the stroke Conveyor unit consists of the as a stop serving lifting pin connected with a set screw is that can be rotated in a thread fixed to the housing and with which the axial position of the lifting pin is individual can be adjusted. Similarly, it is possible the radial position of the Lift pin with respect to the longitudinal axis of the piston Change pump. With the above Embodiment is preferably the other counter gear (on the opposite side of the crankshaft) one permanently adjustable lubricant pump assigned. For the adjustable lubricant pump that is on the same Side of how the fuel pump is arranged offers itself as a location for the actuator one axis above of the axes of the counter wheels, which are preferably transverse to Crankshaft axis lies.

The counter gear driving the fuel pump becomes after a further embodiment of the invention axially guided on both sides in the housing block; the same applies for the one driving the lubricant delivery device Counter wheel. Preferably the piston or the Lifting disc of the adjustable lubricant pump and / or the fuel pump with the associated counter wheel non-rotatable, but can be pushed in engagement. Finally can all lubricant pumps as adjustable Conveyor units are designed.

Brief description of the drawings

Fig. 1 bis 3

im Schnitt quer zur Kurbelwellenachse jeweils unterschiedliche Ausführungen der erfindungsgemäßen Vorrichtung.

Several exemplary embodiments of the invention are explained in more detail below with the aid of schematic drawings. Show it:

1 to 3

different versions of the device according to the invention in cross section to the crankshaft axis.

Detailed description of the invention and best way for carrying out the invention

The devices shown in Figs. 1 to 3 each have in a housing 10 on the Crankshaft 11 arranged helical gear 12 on opposite sides with counter wheels 13 and 14 in Intervention stands. The counter wheel 13 drives the Housing part 15 arranged lubricant pump 16 over the drive shaft 17, the drive shaft 17th the piston of the lubricant pump 16 at the same time Bearing pin for the counter wheel 13 forms. This piston 18a has an end sloping surface 18 as a lifting disk on against one in the housing 15 via a Adjustment screw 19 held lifting pin 20 abuts. At Rotation of the counter wheel 13 guides the drive shaft 17 oscillating up and down movements, whereby the (see Fig. 1) in the inlet port 21, 22 promoted Oil is pressed under pressure in the outlets 23, 24. At this oscillating movement becomes the drive shaft supported by the spring 25. In the in Fig. 1st illustrated embodiment are thus from the Drive shaft 17 two the lubricant pump 16th forming conveyor units 161 and 162 driven, the Pumping action due to the different effective Piston areas is different in size.

The drive shaft 26 forms in a corresponding manner the opposite side a bearing journal for the Counter wheel 14 and serves to drive a fuel pump 27, the conveyor unit 28 via the inlet port 29 Sucks in fuel and pumps it into the outlet port 30. The two drive shafts for the lubricant pump 16 and the fuel pump 27 are parallel to each other aligned. This results in a compact dense design that is used in internal combustion engines for Hand-held tools are beneficial. Alternatively for this it would also be possible to drive the drive shaft 17th and 26 to be arranged in a V-shape.

Correspondingly, that shown in Fig. 2 Unit block through the crankshaft 11 that Helical gear 12 driven, which in the counter wheels 13, 14 engages. Here, too, the drive shaft 17 serves as Bearing journal for the counter gear 13. The drive shaft 17 is part of a lubricant pump 16, which over the Inlet 21 the lubricant in the outlet port 23rd promotes. Corresponding same parts as the Lifting disc 18, the lifting pin 20 and the adjusting screw 19 and the spring 25 are the same Reference numerals as designated in Figure 1. On the opposite side serves the counter gear 14 and the Drive shaft 26 both for driving the fuel pump 27 and for driving the lubricant pump 31, the is arranged above the fuel pump 27. The Drive shaft 26 has one at its upper end frontal and serving as a lifting disc 32 Inclined surface against an adjustable lifting pin 33 is present. For adjusting the lifting pin in the axial direction An actuating unit serves in the direction of the drive shaft 26 34, which has a manual operating lever 35 can be operated. The piston 36, the part of the Drive shaft 26, feeds through an inlet 37th lubricant entering the outlet 38 in after the State of the art for plunger pumps known Wise. By design, the actuator 34 above the drive shafts 17 and 26 and across Longitudinal axis of the crankshaft 11 arranged.

In the device shown in Fig. 3, the is constructed in accordance with the device according to FIG. 2, is the adjustable actuator 34 for controlling the Pump delivery rate of the lubricant pump 16 below the Counter wheels 13 and 14 arranged while the Set screw 19 for the axial displacement of the previously described lifting pin 33 and thus to regulate the Delivery rate of the lubricant pump 31 is used. This too as an auxiliary unit block of an internal combustion engine, trained especially for two-stroke chainsaws Device is compact and uses Application of a few components through the Crankshaft rotation available during engine operation standing energy.

Reference symbol list:

casing

10th

crankshaft

11

Helical gear

12th

Counter wheels

13, 14

Housing part

15

Lubricant pump

16

drive shaft

17th

Sloping surface

18th

Adjusting screw

19th

Lift pin

20th

Inlet connector

21, 22

Outlets

23, 24

feather

25th

drive shaft

26

Fuel pump

27

Conveyor unit

28

Inlet connector

29

Exhaust port

30th

Lubricant pump

31

Lifting disc

32

Lift pin

33

Actuator

34

Operating lever

35

piston

36

Inlet

37

Outlet

38

Conveyor units

161, 162

Claims (10)

1. A device with fuel injection and lubricant feeding device for internal combustion engines, preferably for manually controlled tools such as chain saws, with a helical gear wheel (12) placed on a crankshaft (11) or indirectly driven by the crankshaft (11), the helical gear wheel being in mesh with a mating gear (13) for driving the lubricant pump (16), whereby a piston (18a) of the lubricant pump (16) constitutes a bearing journal for the mating gear (13) and shows an oblique surface (18) on the face which sits close against a lifting pin (20), adjustably held in the housing, over which the flow rate of the lubricant pump (16) is adjustable,
   characterized in
   that the helical gear wheel (12) is in mesh with two mating gears (13, 14), each of which is connected with a motor shaft (17, 26) for respectively one lubricant pump (16, 31) and/or a fuel pump (27).
2. A device according to claim 1,
   characterized in
   that the motor shafts (17, 26) for the lubricant pump (16, 31) and/or the fuel pump (27) are orientated parallel or V-shaped to each other.
3. A device according to claim 1 or 2,
   characterized in
   that a feeding unit (161, 162) for lubricant is respectively allocated to one of the mating gears (13) on both sides, preferably both feeding units (161, 162 being drivable by an eccentric disk (18) on one of the feeding units (162).
4. A device according to claim 3,
   characterized in
   that the feeding units (161, 162) for lubricant show effective piston areas which are varying in size.
5. A device according to one of the claims 1, 2 or 4,
   characterized in
   that respectively a feeding unit is allocated to one of the mating gears (14) on both sides, one of these feeding units being as a continuously working fuel pump (27) and the other feeding unit being a lubricant pump (31) with adjustable flow rate.
6. A device according to claim 5,
   characterized in
   that a fixed adjustable lubricant pump (16) is allocated to the other mating gear (13).
7. A device according to claim 5 or 6,
   characterized in
   that the adjusting unit (34) for the adjustable lubricant pump (31) is placed in an axis above the axles of the mating gears (13, 14), preferably transversely to the crankshaft axle.
8. A device according to any of the claims 5 to 7,
   characterized in
   that the mating gear (13, 14) driving the fuel pump (27) and/or the lubricant feeding device (16, 31) is guided axially on both sides in the housing block (10, 15).
9. A device according to any of the claims 5 to 8,
   characterized in
   that the piston (36) or the eccentric disk (32) of the adjustable lubricant pump is in mesh with the allocated mating gear (14) by being resistent to torsion but able to a translatory motion.
10. A device according to any of the claims 1 to 9,
    characterized in
    that all lubricant pumps (16, 31) are configured as adjustable feeding units.

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