DE7129528U - Safety device - Google Patents

Description

ENGINE AND TURBINE UNION
FRIEDRICHSHAPEN GMBH

Priedrichshafen

¹ safety device

The innovation relates to a safety device for a ¹ internal combustion engine with liquid cooling and with hydraulic

|. locally controlled controller, which when falling below one of the

I corresponding to the respective load on the internal combustion engine

£ 5 minimum oil pressure, the internal combustion engine by turning off the sub I refraction fuel supply. Purpose of the security

¹ lifting device is to prevent the destruction of the internal combustion engine

Can be prevented by insufficient or inadequate lubrication.

I As a measure of the load on the internal combustion engine, the

10 high speed can be used because as a rule as the speed increases, so does the power requirement of the one to be driven Machines and thus the load on the internal combustion engine increases.

■ It is obvious that as a measured variable for the speed of the internal combustion

15 machine to use the stroke of the flyweights of a pendulum regulator available for the regulation and thus the height of the minimum lubricating oil pressure depending on the speed.

! Such controllers combined with a shut-off device are

known and advantageous to use on new machines.

20 Should, however, be an internal combustion engine that has already been put into operation subsequently equipped with such a safety device

gm-soh 6 8 4 5a

7129528 04/30/75

the entire controller must be replaced. This measure is complex, expensive and often not feasible for reasons of space.

The task of the innovation is therefore to represent the speed dependency of the safety device in such a way that the safety device can also be added subsequently without great effort existing internal combustion engines can be attached,

This object is achieved in that a piston acted upon by the lubricating oil and a membrane acted upon by the coolant are arranged in a common housing, the piston being supported against the membrane and this against the housing each via a spring and the piston acting as the working medium for the Releases or shuts off the lubricating oil used by the regulator depending on the coolant and lubricating oil pressure.

This is used as a measured variable for the speed and thus for the

Load of the internal combustion engine uses the speed-dependent pressure of the coolant.

A fast turn-off of the engine when the oil pressure drops below the minimum allowable value is achieved in that the piston is made for the lubricating oil of two individual pistons, forming an oil space, which is acted upon in the lowering of the oil pressure below a predetermined value with lubricating oil pressure, whereby the piston is pressed into the shut-off position, in which it is held by a spring.

The advantage of the innovation is that the speed-dependent safety precautions can be implemented in a simple manner and with little effort.

3a

71P9528 04/30/75

direction can be retrofitted in existing machines, but also in new systems. The device can be provided at any point on the machine with the appropriate lengthways guide and requires ¹ .; little space. If the safety device responds because the intended lubricating oil pressure cannot build up under high loads due to excessive bearing play, the internal combustion engine can continue to be operated safely with small and medium loads.

An embodiment of the innovation is shown in the drawing and is described in more detail below using a safety device for a diesel engine.

In a housing 11 are two pistons 12 and 13, a membrane 14, an adjusting device 15 and the springs 16, 17 and 18 are arranged. Through a line 19 is a chamber 20 of the safety device Connected via a check valve 21 and a chamber 22 to a pressure oil-operated centrifugal pendulum 24 of the diesel engine. The pressure of a pre-oil lubrication pump, not shown, is fed into line 19 via a line 25 and a check valve 26 fed in.

The lubricating oil pressure acts on the chamber 20 via a line 27, and the cooling water pressure acts on a chamber J> 0 of the safety device via a line 29. A chamber 31 is located between the two pistons 12 and 13. The setting device I5, together with the design of the springs 16 and 17, enables the safety device to be adapted and used for different types of engines with correspondingly different cooling water and lubricating oil pumps.

¹ ^ .1.1975 * ο ",

gm-sch ο ο 4 j? a

7129528 04/30/75

Before starting the engine, the externally driven pre-oiling pump, Line 23, check valve 26 and line 19 of the regulator 24 and the chamber 22 acted upon with oil and thus the pistons 12 and 12 pushed to the left,

After the engine has been started, it acts in line 27, 28 and in chamber 20 the lubricating oil pressure, which now supplies the regulator with oil via check valve 21 and line 19 and at the same time the Maintains pressure in chamber 22. The pre-oil lubrication pump is now turned off. At the same time, the cooling water pressure in line 29 and in the chamber 30 acts on the membrane 14. Due to the cooling water pressure in the chamber 30 on the one hand and through the lubricating oil pressure in the chamber 22 on the other hand, the two pistons 12 and 13 held in the position shown.

As the engine speed increases, both the cooling water pressure increases in chamber 30 as well as the engine oil pressure in chamber 22 due to the pump characteristics of those driven by the engine Cooling water or lubricating oil pump. This gives the lubrication points according to the requirements of the higher load a larger amount of oil. The two pistons 12 and 13 remain in the depicted situation.

Now falls for whatever reason, e.g. failure of the oil pump or line break in the lubricating oil lines, the oil pressure decreases, then the cooling water pressure acting in the chamber 30 predominates and pushes the two KoI-ben over the membrane 14 and the spring 16 12 and 13 to the right. This process can also be triggered by increasing the bearing clearance high speeds can no longer develop a correspondingly high lubricating oil pressure.

' ^A

gm-sch ο 8 η ^ α

7129528 04/30/75.

The lubricating oil pressure in line 28 can now enter the chamber Enter 31 and equalize the pressure in chamber 22. The feather 18 pushes the piston 13 to the right and locks the Leitong away. This means that line 19 is also depressurized and the controller can no longer work. The engine comes due to lack of fuel to a standstill.

The shutdown was carried out by falling below the minimum lubricating oil pressure at high speeds, the pre-oil pump can be used the engine can be started again and continue to work at low and medium speeds in emergency mode.

gm-sch D 8 4 3 a

7129528 04/30/75

Claims (1)

Protection claims 1. Safety device for an internal combustion engine with Liquid cooling and with hydraulically controlled regulator, the minimum lubricating oil pressure corresponding to the respective load on the internal combustion engine the internal combustion engine by interrupting the fuel supply turns off, characterized in that in a common housing (11) is acted upon by the lubricating oil Piston (13) and a membrane acted upon by the coolant (14) are arranged, the piston against the membrane and this against the housing each via a spring (16,17) are supported and the piston is dependent on the lubricating oil serving as a working medium for the regulator (24) releases or shuts off the coolant and lubricating oil pressure. 2. Safety device according to claim 1, characterized in that that the piston for the lubricating oil consists of two individual pistons (12, 13) which form an oil space (31). January 13, 1975 . _. , gm-sch 6 8 4 3a 7129528 04/30/75