The present disclosure relates to a coolant pump for internal combustion engines that is driven mechanically by a belt pulley, a gear wheel, a plug-in shaft or the like and that is controllable with the aid of a valve spool.
DE 35 17 002 A1 shows a water cooled internal combustion engine, in which the water pump is connected directly with the camshaft of the internal combustion engine and is driven by same.
In DE 10 2010 050 261 (B3), a mechanically driven controllable coolant pump is shown that significantly reduces the pollutant emission as well as the friction losses and the fuel consumption in the entire working range of the engine and that is in addition manufacturable easily, cost-effectively, and with minimum effort in terms of production and assembly, without the use of additional electric auxiliary pumps as well as without the installation of additional actuators and also without an oversized coolant pump, i.e., having less driving power, ensuring the cooling of specific components, such as for example the exhaust gas recirculation system, of the exhaust manifold, of the heater, etc., in the case of standing cooling water in the cylinder crankcase and in the cylinder head at a high degree of operational safety and reliability at high efficiency, and still making possible a simple and cost-effective integration in the engine management at the same time. The valve spools that are displaceably mounted in the pump housing and that have flow openings and an additional bypass pipe merging into the spool working chamber are characterized in that at the spool back wall of the valve spool a thrust washer is situated or the spool back wall itself is designed as a thrust washer, and one/multiple contact surface(s) is/are situated at the pump housing opposite to this thrust washer on the belt pulley side, and in the pump housing one/multiple outlet opening(s) that are enclosed by this/these contact surface(s) and that merge(s) into the bypass pipe is/are situated, and in the case of an impeller outlet that is completely unblocked by the outside cylinder of the valve spool the thrust washer directly or indirectly engages in an operative connection with the contact surface(s) at the pump housing and thus closes off the outlet opening(s).
WO 2018/158272 A1 shows a water pump that is situated on the front side of the crankcase and is driven by a belt. In this case, it is disadvantageous that the arrangement of the water pump at a front side of the crankcase results in an installation size of the entire engine that is too long for some applications.
It is an object of the present disclosure to avoid the above-named disadvantages and to create an internal combustion engine that has smaller installation dimensions, in particular with regard to its linear extension.
The present disclosure provides an internal combustion engine, including at least a cylinder head (1) including a water pump (2) that is integrated into the cylinder head housing. The present disclosure also provides a method for operating an internal combustion engine, characterized in that it includes an internal combustion engine as recited in one or multiple of the preceding claims.
The present invention is elucidated below in greater detail based on two exemplary embodiments.
Cylinder head 1 illustrated in
When engines are developed, great value is set on compactness. In particular the length, height, and width of the engine is crucial to keep the devices compact, into which this engine is to be installed. One criterion for the engine length, width, and height is cylinder head 1 including the installation of water pump 2. Present-day constructions show consoles that are screwed in front of or at the cylinder crankcase and/or in front of or at cylinder head 1. The consoles accommodate parts of thermostats 5 and the lines of the water supply to water pump 2. These constructions need a sufficiently large installation space. Other constructions show water pumps 2 in cylinder crankcases that render the engine unusably wide in the steer angle range for tractor applications.
In the present case, an approach is illustrated that considerably reduces the installation length, width, and height of the engine. In the case of a tractor application, there is nothing in the way in the steer angle range. This is achieved in that water pump housing 14, including water pump screw 9, pressure channel 4 and intake channel 3 is integrated into cylinder head 1. Intake channel 3, as illustrated in
Water pump 2 no longer determines the length of the engine. The additional integration of thermostat 5, as seen in
In
Only one connecting piece 8, as seen in
In
Number | Date | Country | Kind |
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10 2019 006 790.8 | Sep 2019 | DE | national |
Filing Document | Filing Date | Country | Kind |
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PCT/EP2020/000159 | 9/17/2020 | WO |