JPS6029038B2 - Power machine lubrication system - Google Patents

Abstract

1507571 Lubricating AUDI NSU AUTO UNION AG 17 Nov 1975 [7 Dec 1974] 47223/75 Heading F2A A machine comprises at least one shaft 22 mounted in a pressure-lubricated journal bearing 17, a lubricant dosing pump 23, and means for feeding lubricant thereto, the intake side 27 of the dosing pump being connected through a pipe or passage 31 to the clearance between the shaft and bearing at a point 32 which is spaced away from the point at which lubricant is fed to the bearing. The close clearance in the bearing acts as a filter on the lubricant supplied to the dosing pump. The shaft may be part of a gear pump 13, 14 forming the main lubricant pump of the machine or engine, lubricant being supplied to the bearing 17 and to a further bearing 18 from the delivery chamber 20 of the pump. The shaft may drive the dosing pump through dogs 29, 30. In a further embodiment (Fig. 2, not shown), the intake side of the dosing pump is connected through a pipe which passes through the bearing 17 rather than through the axial bore in the shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention comprises at least one shaft, the bearing position of which is supported in a sliding bearing, in which pressurized oil is supplied from a supply position of the bearing area to the bearing gap by means of a lubricating oil pump. The present invention relates to a lubricating device for a power machine, in particular an internal combustion engine, in which a portion of the lubricating oil supplied and sent through the lubricating oil pump is supplied to the lubricating oil metering pump via an oil supply pipe.

A lubricating oil metering pump is installed in a power machine, for example, an internal combustion engine, separately from a lubricating oil pump for pressurized circulation, and lubricates piston seals with measured lubricating oil depending on the rotation speed and/or load. supply for. In known devices of this type, the supply of lubricating oil to the lubricating oil metering pump takes place as follows.

A lubricating oil metering pump is connected directly to the lubricating oil circuit, which supplies lubricating oil to the bearing locations of the power machine. Even though this circuit at least filters the lubricant supplied to the bearing location, in this manner, worn or dirty parts can still reach the lubricant metering pump and impede the functioning of the sensitive parts inside the lubricant metering pump. Loss is inevitable. SUMMARY OF THE INVENTION An object of the present invention is to provide a device for supplying lubricating oil to a lubricating oil metering pump by supplying sufficiently filtered lubricating oil without directly connecting the lubricating oil metering pump to a lubricating oil circuit. shall be.

This problem is solved by the present invention as follows. The suction side of the lubricating oil metering pump is connected to the bearing position of the shaft via an oil supply line, the connection position of the oil supply line being arranged at a distance from the lubricating oil supply position. In order to supply the necessary lubricating oil to the lubricating oil metering pump, the lubricating oil is forced into the narrow gap between the bearing position and the rattan and forms a lubricating oil film, in which case the lubricating oil metering pump is supplied with lubricating oil. lubricating oil is removed from the lubricating oil film area.

Therefore, only the lubricating oil that is pressed by the space formed by the bearing gap between the bearing position and the shaft is supplied into the connected oil supply path. This space is so small that contaminants contained in the lubricating oil do not pass through, as in the case of a filter. In this way, contaminants that are harmful to the lubricating oil metering pump but have no meaning at all in the lubricating oil circuit are forced into the plain bearing and are therefore carried into the lubricating oil metering pump via the oil supply path. will never reach. Considering the arrangement of the lubricating oil pump in relation to the power machine, it becomes a simple construction if the shaft is at the same time the driving shaft of the lubricating oil metering pump.

In order to eliminate the unique oil supply path for supplying lubricating oil,
An elongated hole is provided in the shaft at least between the lubricating oil metering pump and the bearing position, and the elongated hole is connected on the one hand to a transverse hole at the bearing position.
On the other hand, it is connected to the suction side of the lubricating oil metering pump.

This relatively simple configuration has the advantage that the lubricating oil can be supplied directly from the bearing to the lubricating oil metering pump in a short path length. Furthermore, it is proposed that the shaft is formed by a drive shaft of a cassette oil pump of a power machine.

There is a supply position on one side of the lubricating oil pump's discharge chamber where lubricating oil can be forced into the narrow gap between the bearing position and the shaft, and the bearing position of the pump is controlled by the pressure oil flowing from the discharge chamber? Tsubasa is pointed at. Lubricating oil for the lubricating oil metering pump is drawn out from the bearing location. The lubricating oil pump may be a well-known gear pump.

However, it is also possible to use lubricating oil pumps or other pumps with a rotating discharge body. In power machines, such as internal combustion engines, in which lubricating oil is supplied from a lubricating oil metering pump depending on the rotational speed, the shafts are simultaneously the driving shafts of the lubricating oil pump, vacuum pump, fuel pump and distributor.

With this configuration, necessary auxiliary equipment can be installed particularly easily and in a small space. An embodiment of the device according to the invention for supplying lubricating oil will now be described with reference to the drawings.

The power machine consists of a case containing a shaft 2 supported in sliding bearings 4, 5 in bearing position 3.

The shaft 2 has a central slot 6 which is closed at the shaft end by a plug 6a and which is connected via two radial holes 7, 8 to the plain bearings 4, 5. There is. Radial hole 7
, 8, ring-shaped grooves 4a, 5 are provided in the sliding bearings 4, 5.
A is provided. The plain bearings 4, 5 are supplied with pressurized lubricating oil from a lubricating oil pump, which lubricating oil is first supplied to the plain bearing 4 via a conduit 9 and then to the annular groove 4a of the plain bearing 4 as well as the radial bore. 7 and then through the elongated hole 6 into the radial bore 8 and from there into the annular groove 5a and into the plain bearing 5. The lubricating oil flows from the ring-shaped grooves 4a, 5a to both sides in the axial direction into the narrow gap between the bearing position 3 and the sliding bearings 4, 5. By doing this, a thin lubricating oil film is formed, and this film extends over the entire surface of the sliding bearings 4 and 5, and by continuously supplying lubricating oil, it spreads from the ends of the sliding bearings 4 and 5. leak.

In this embodiment, the device for supplying lubricating oil to the lubricating oil metering pump is constructed as follows.

That is, an oil supply pipe 10 as an oil supply passage is provided in the sliding bearing 5 with a gap from a ring-shaped groove that is a lubricant supply device, and this oil supply pipe 10 as an oil supply passage is connected to a lubricant metering pump (not shown). Connected to the suction side. A prescribed amount of lubricating oil forced into the sliding bearing 5 flows into the oil supply pipe 10 as an oil supply path while passing through the gap formed by the sliding bearing 5 and the bearing position 3. The narrow gap between the bearing position 3 and the sliding bearing 5, that is, the gap that forms a lubricant film for lubrication of the bearing position 3 and corresponds to a bearing clearance of 0.030 to 0.05 mm, is contained in the lubricating oil. The inside of the oil supply pipe 10 is narrow enough to prevent the flow of contaminants and thus satisfy the function of a filter, so that the lubricating oil can flow into the lubricating oil metering pump without any problem. . The interval A is such that the amount of oil flowing into the oil supply pipe 10 as an oil supply path is
The lubricating oil metering pump is set to have an excess amount of oil in addition to the available amount needed to supply the lubricating oil metering pump. The embodiment shown in FIG. 2 shows a device for supplying lubricating oil to a lubricating oil metering pump provided directly on a lubricating oil gas pump.

Gap pumps serve to lubricate the lubrication points of power machinery. As is well known, the lubricating oil gear pump mainly consists of a case 11 and a case lid 12.
Two pump gears 13 and 14 are housed inside.
One pump gear 13 is fixed to a drive shaft 15, and the pump gear 14 is rotatably supported by a shaft 16 supported by the case 11 and case lid 12. Pump gear 13,1
4 rotates in a correspondingly formed recess of the case 11;
They interlock with each other with their external teeth. The drive shaft 15 is supported by a sliding bearing 17 of the case 11 and a sliding bearing 18 of the case lid 12, and carries a driving gear 19 at the end of the shaft passing through the case 11. When the lubricating oil pump is actuated, i.e. rotated via the drive gear 19 and the pump gears 13, 14 discharge lubricating oil, a hydraulic pressure is generated in the lubricating oil pump and its discharge chamber 20, and this hydraulic pressure is caused by the discharged lubricating oil. A part of the pump gear 13,1
4 and between the case 11 and the case lid 12, as well as the bearing position between the pump gear 14 and the shaft 16, and the drive shaft 1.
5 and the bearing position between the sliding bearings 17 and 18, and flows out.

The oil film formed in these gaps provides sufficient slippage to the moving parts of the lubricating oil pump. The withdrawal of lubricating oil for supplying a lubricating oil metering pump (not shown), which is used for metering lubrication of the actuating device, takes place in the exemplary embodiment from the lubricating oil film of the plain bearing 17, in this case from the discharge chamber. An oil supply pipe 21 as an oil supply path is connected to a position spaced apart from the supply position 17a on one side of the lubricant 20 between the sliding bearing 17, and the oil supply pipe 21 is connected to the suction side of the lubricating oil metering pump. . In this embodiment as well, lubricating oil is applied to the drive shaft 15 and the sliding bearing 1.
7, only the lubricating oil can flow into the oil supply pipe 21, and therefore no contaminants are present in this oil without providing a filter. In FIG. 3, the same reference numerals are used for equivalent parts to those shown in FIG.

In contrast to the embodiment of FIG. 2, the lubricating oil pump, for example when used in an internal combustion engine, has a drive shaft 22 which simultaneously measures the lubricating oil, which is the object achieved in the embodiment of FIG. It is also the drive shaft of the pump 23, and the lubricating oil metering pump 23 is attached to a hole 27 in a case wall 28 of the internal combustion engine on an extension of the drive shaft 22. For this purpose, the drive shaft 22 is equipped with a cam 29 which engages a camshaft 30 of the lubricating oil metering pump 23. Furthermore, the drive shaft 22 also drives a vacuum pump 24, a fuel pump 25, and a distributor 26. The drive shaft 22 includes a lubricating oil metering pump 23 and a sliding bearing 17.
It has a long hole 31 as an oil supply path between it and the innermost hole 31'.
It is connected to the sliding bearing 17 via the lateral hole 32 on the one hand, and to the suction side of the lubricating oil metering pump 23 on the other hand. When the lubricating oil pump is driven, lubricating oil is supplied to the lubricating oil metering pump 23 via the lubricating oil film.

The oil film is formed between the drive shaft 22 and the sliding bearing 17. The lubricating oil is supplied from a lubricating oil film to a horizontal hole 3 provided at a predetermined distance A from a supply position 17a on one side of the discharge chamber 20.
2 and reaches the hole 27 through the outermost hole 31. The elongated hole 31 is connected via a groove 33 to the suction side of the lubricating oil metering pump. The lubricating oil excessively supplied into the hole 27 flows into the hole 34.
It is returned to the interior of the case wall 28 through the casing wall 28 to prevent contaminated objects from entering in the opposite direction. In addition to the advantages described in connection with FIGS. 1 and 2, this embodiment has a simple structure because the oil supply pipe is omitted. Embodiments of the invention allow a lubricating oil metering pump to be easily configured and to operate reliably, for example for use in metered fresh oil lubrication of bearings or also for mixed lubrication of internal combustion engines.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of the present invention, and is a longitudinal cross-sectional view of the bearing position of a shaft of a power machine, FIG. 2 is a longitudinal cross-sectional view of a lubricating oil pump, and FIG. This figure shows a modified example of . 2, 15, 22...shaft, 3...bearing position, 4,
5...Sliding bearing, 10, 21, 31...
・Oil supply pipe, 19... Drive gear, 23...
・Lubricating oil metering pump, 24...Vacuum pump, 2
5...Fuel pump, 26...Distributor, 32...Horizontal hole. Figure 1 Figure 2 Figure 3

Claims (1)

Claims: 1. At least one shaft, which is supported in a sliding bearing at a bearing position, with pressure oil being supplied from a supply position in the bearing area to the bearing gap by a lubricating oil pump; Furthermore, in a lubrication system for a power machine, especially an internal combustion engine, in which a part of the lubricating oil sent through the lubricating oil pump is supplied to the lubricating oil metering pump via the oil supply line, the oil supply line to the lubricating oil metering pump is A supply position of pressure oil supplied from the pump to the sliding bearing is connected through a bearing gap of the sliding bearing acting as a filter, and in this case, the oil supply path is connected at a distance A from the pressure oil supply position for the sliding bearing. A lubricating device for a power machine, characterized in that the lubricating device branches out from the bearing gap of the sliding bearing across from the bearing gap. 2 at least one shaft, which shaft is supported in a plain bearing at a bearing position, with pressure oil being supplied to the bearing gap from a supply position in the bearing area by a lubricating oil pump; A portion of the lubricating oil is supplied to the lubricating oil metering pump via the oil supply path, and the oil supply path to the lubricating oil metering pump acts as a filter and a supply position for the pressure oil supplied from the lubricating oil pump to the sliding bearing. are connected through a bearing gap of a sliding bearing, in which case the oil supply path is
In a lubricating system for a power machine, in particular an internal combustion engine, which branches out from the bearing gap of a sliding bearing at a distance A from the pressure oil supply position for the sliding bearing, the shaft is a driving shaft of a lubricating oil metering pump and a lubricating oil pump. The oil supply path to the lubricating oil metering pump is formed as a hole extending vertically on the drive shaft, and the hole is connected to the bearing gap of the sliding bearing of the drive shaft through a horizontal hole that opens on the outer circumferential surface of the shaft. A lubricating device for a power machine, characterized in that it is connected to.