DE2138494A1 - SAFETY DEVICE - Google Patents

Description

\ _ "Security device. -:" -.

The invention relates to a safety device for an internal combustion engine with liquid cooling, which in the event of a failure of the lubricating oil pressure or if the pressure falls below a level corresponding to the respective load on the internal combustion engine. Minimum lubricant pressure turns off the internal combustion engine by interrupting the fuel supply. Purpose of the safety ~ \ apparatus is to prevent destruction of the internal combustion engine by a lack of or inadequate lubrication. The speed can be used as a measure of the load on the internal combustion engine, because as a rule, as the speed increases, the power requirement of the machines to be driven and thus the load on the internal combustion engine also increase. . '.

It is obvious as a measured variable for the speed of the internal combustion engine to use the stroke of the flyweights of a pendulum regulator available for control and thus the level of the minimum lubricating oil pressure to be ensured depending on the speed. Such controllers combined with a shutdown device are known and can be used advantageously on new machines.

Should, however, be an internal combustion engine that has already been put into operation

209886/0686

27.γ. 1971 - 6843

(Wa e BAD Oi ^ GfNÄL - " ² "

be retrofitted with such a safety device, so the entire controller must be replaced. ^: This measure is time-consuming, expensive and often not feasible due to lack of space.

The object of the invention is therefore to show the dependence of rotation • of the safety device in such a way that the safety device without any great effort. existing Internal combustion engines can be grown.

This object is achieved in that as a measured variable for the speed and thus the load on the internal combustion engine speed-dependent running pressure of the coolant is used.

An advantageous embodiment of the invention for an internal combustion engine with hydraulically controlled regulator-is that A piston acted upon by the lubricating oil and a membrane acted upon by the coolant are arranged in a common housing are, with the piston against the membrane and this against the housing are each supported by a spring and the piston is dependent on the lubricating oil serving as a working medium for the regulator of coolant and lubricating oil pressure releases or shuts off.

A quick shutdown of the internal combustion engine when sinking of the oil pressure "below the permissible value is achieved that the piston for the lubricating oil consists of two individual pistons, which form an oil space, which when the lubricating oil pressure drops pressurized with lubricating oil pressure below a predetermined fourth

209886/0686

July 27, 1971

BATH

is * whereby the piston is pushed into the shut-off position., in which he is held by a spring.

The advantage of the invention is that on simple VJ el se and with little effort the speed-dependent? Safety device retrospectively in existing machines., however "also with new. Systems, can be installed. The device can be provided at any point of the machine with the appropriate line routing and takes up little space. If the safety device responds, the intended one will change if the bearing play is too large Lubricating oil pressure cannot build up under high loads, so'kann the internal combustion engine with small and medium speed. can continue to be operated safely.

An embodiment of the invention is shown in the drawing and will be used in the following on a safety device for a diesel engine described in more detail:

In a housing 11 are two pistons 12 and 1Ji 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 security device via a check valve 21 and a chamber 22 with a pressure oil-actuated centrifugal pendulum 24 of the 'diesel engine ver bound. In the line 19 is the "pressure of a, not shown, The pre-oil pump via a line 25 and a non-return valve 26 fed in. ■ · ■ -..- "

The lubricating oil pressure acts on the chamber via a line 27 20, - the cooling water pressure via a line 29 a chamber j50 the safety device. Between the two pistons 12 and

27-7.1971 ■ ■ ■ '6843

Gm / Jo -4-

BAOORlGiNAl.

there is a .Kammer 3I, the adjustment device; 15 allows, together with the design of the springs 16 and 17, the . Adaptation and use of the safety device for different engine types with correspondingly different cooling water and lubricating oil pumps.

■ Before starting the engine, the "externally driven forward ■ oil lubrication pump, line 25, check valve 26, and line 19 the regulator 24 and the chamber 22 are charged with oil and thus the pistons 12 and 13 are pressed to the left. ■ "

After starting the engine acts in line 27, 28 and in chamber 20 the lubricating oil pressure., Which is now via check valve 21 and line 19 the Reglei 'supplied with oil and at the same time the Pressure in chamber 22 is maintained. The pre-oil lubrication pump is now switched off. At the same time, the cooling water pressure acts in the line 29 and in the chamber 'j50 on the membrane 14. Due to the cooling water pressure in chamber j50 on the one hand and by the lubricating oil pressure in der'Kammer 22, on the other hand, the two pistons 12 and 13 held in the position shown.

As the engine speed increases, the cooling water? pressure 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 drops for whatever reason, e.g. failure of the lubricating oil pump

209886/068 6

July 27, 1971

Grii / Se

or line break in the lubricating oil lines, the oil pressure abj outweighs the cooling water pressure acting in chamber JO and pushes - 'via the membrane -14 and the spring 16 the two pistons 12 and 1J to the right. This process can also be triggered by the fact that, due to increased bearing play, a correspondingly high lubricating oil pressure can no longer develop at high speeds.

The lubricating oil pressure in line 28 ′ can now enter chamber 31 and compensate for the pressure in chamber 22. The feather 18 pushes the piston 1j5 to the right and blocks the line away. This means that line I9 is also depressurized and the controller can not work any more. 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.

209886/0686

July 27, 1971.

Green / Ge - - ORIGINAL BATHROOM

Claims (1)

Claims 1.! Safety device for an internal combustion engine with -Liquid cooling, which when falling below one of the respective load on the internal combustion engine Minimum lubricating oil pressure the internal combustion engine by under- - breakage that cuts off fuel supply, characterized in that that as a measured variable for the load on the internal combustion engine, the speed-dependent pressure of the KUhI- • by means of, is used. 2. Safety device according to claim 1 for an internal combustion engine with a hydraulically controlled regulator, characterized 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 against the membrane and the latter against the housing each via a spring are supported and the piston releases or shuts off the lubricating oil serving as the working fluid for the regulator, depending on the coolant and lubricating oil pressure. j5. Safety device according to claim 2, characterized in that that the piston for the lubricating oil consists of two individual pistons ■ (12, 1j5), which form an oil space (^ 1), which when it drops of the lubricating oil pressure below a given value - 2098 8 6/0686 7/27 I97I, 6843 Gm / Se -; .. BAD GffiGFMAL with ochmieröldriack is applied, whereby the piston (13>) is pressed into the shutdown position in which it is held by a spring (18). 209 8 86 / ΠΡΚΡ ί? γ.γ.ν / π. 68ί | .5 Lee r s e i t e