CYLINDER HEAD WITH CAST-IN WATER PUMP AND INTEGRATED THERMOSTAT

Description

[0001] DE3517002A1 shows a water-cooled internal combustion engine in which the water pump is directly connected to the camshaft of the internal combustion engine and is driven by it.

[0002] DE 10 2010 050 261 (B3) shows a mechanically driven, adjustable coolant pump which significantly reduces pollutant emissions, friction losses and fuel consumption across the entire engine operating range and which is also easy to manufacture and assemble, cost-effective, with minimal effort, without the use of additional electrical auxiliary pumps, without the installation of additional actuators and without over-dimensioning the coolant pump, i.e. with lower drive power, ensures the cooling of special components such as the exhaust gas recirculation, the exhaust manifold, the heater, etc. when there is stagnant cooling water in the cylinder crankcase and in the cylinder head with high operational safety and reliability and high efficiency, while at the same time enabling simple and cost-effective integration into the engine management system.The valve spool, which is displaceably mounted in the pump housing, has flow openings and an additional bypass nozzle opening into the spool working chamber. It is characterized in that a thrust washer is arranged on the rear wall of the valve spool, or the rear wall of the spool itself is designed as a thrust washer, and that one or more contact surfaces are arranged on the pump housing opposite this thrust washer on the pulley side, and that one or more outlet openings enclosed by this contact surface are arranged in the pump housing and open into the bypass nozzle, and that when the impeller outlet is completely released by the outer cylinder of the valve spool, the thrust washer comes into direct or indirect operative connection with the contact surface(s) on the pump housing and thereby closes the outlet opening(s).

[0003] The invention relates to a coolant pump for internal combustion engines which is mechanically driven by a pulley, a gear, a stub shaft or the like and which can be controlled by means of a valve slide.

[0004] WO 2018 / 158272 A1 shows a water pump that is arranged on the front side of the crankcase and driven by a belt.

[0005] The disadvantage is that the arrangement of the water pump on one end of the crankcase makes the overall length of the engine too long for some applications.

[0006] GB1567303A, FR2966876A1, US202056433A1 and US2010162974A1 disclose internal combustion engines comprising at least one cylinder head with a water pump integrated into the cylinder head housing.

[0007] The object of the present invention is to avoid the aforementioned disadvantages and to provide an internal combustion engine which has smaller dimensions, in particular in its longitudinal extension.

[0008] The problem is solved by an internal combustion engine according to claim 1.

[0009] Further advantageous developments arise from the subclaims.

[0010] The invention is explained in more detail below using two exemplary embodiments. The drawings show: Fig. 1:Cylinder head with water pump, thermostat and connection piece. Fig. 2:Cylinder head with water pump housing, rotated view of Fig.1 . Fig. 3: Cylinder head with thermostat from above. Fig. 4: Section BB from Fig. 3 . Fig. 5: Section CC from Fig. 3 . Fig. 6:Module 15 from Fig. 3 .

[0011] The Fig. 1 The cylinder head 1 shown has a water pump 2 cast into the cylinder head 1; this water pump 2 has a thermostat 5 and connecting piece 8.

[0012] When developing engines, great importance is placed on compactness. The length, height, and width of the engine are particularly important in order to keep the equipment into which the engine is to be installed compact. One criterion for the engine length, width, and height is the cylinder head 1, including the attachment of the water pump 2. Current designs feature brackets that are screwed in front of or onto the cylinder crankcase and / or in front of or onto the cylinder head 1. The brackets sometimes accommodate thermostats 5 and water lines to the water pump 2. These designs require a sufficiently large installation space. Other designs feature water pumps 2 in cylinder crankcases, which make the engine unusably wide in the wheel turning area for tractor applications.

[0013] Fig. 2 shows the turned cylinder head with water pump housing made of Fig. 1 .

[0014] This solution presents a significant reduction in the length, width, and height of the engine. In a tractor application, nothing stands in the way of the wheel lock. This is achieved by integrating the water pump housing 14, consisting of the water pump auger 9, pressure channel 4, and suction channel 3, into the cylinder head 1. The suction channel 3, as shown in Fig. 4 shown, the pressure channel 4 and the water pump screw 9, which in Fig. 5 shown, are cast into the cylinder head 1. The impeller 10, the drive shaft with bearing 11 and the housing cover 12, as shown in Fig. 6 shown, the pump is connected as a module 15 via a front opening 13, as shown

[0015] Fig. 2 disclosed, mounted in the water pump housing 14. This makes it possible to place the water pump very close to the engine and at the same time still have enough space for the inlet channels 6, which are in Fig. 1 can be seen, on the cylinder head 1. Due to the high position of the water pump 2, the engine only becomes wider at higher altitudes, but not as wide as in a design with an external water pump 2. The wheel turning area of ​​the tractor remains unaffected. By engaging the water pump 2 in front of the inlet ports 6 from Fig. 1 the motor length is reduced.

[0016] Fig. 3 shows cylinder head 1 with thermostat 5 and module 15 from above.

[0017] The water pump 2 no longer determines the engine length. The additional integration of the thermostat 5, as shown in Fig. 3 As can be seen, above the water pump 2 saves space in height and long paths of the water channels 7, which are an integral part of the common cast body, consisting of cylinder head 1 and water pump 2, and saves additional piping, as is the case in Fig. 4 shown, to the water pump 2, since the water pump 2 is connected directly to the cooling water volume of the cylinder head 1 by means of a water channel 7 through a channel in the cylinder crankcase.

[0018] In Fig. 4 the cut BB is made from Fig. 3 revealed.

[0019] Only one connection piece 8, shown in Fig. 1 , is required. This design reduces the sealing surfaces and pipe lengths throughout the entire water system. The integration of water pump 2 into the head thus ensures a largely pipeless cooling system with fewer components and fewer sealing surfaces, with the exception of the supply and discharge lines to the radiator.

[0020] Fig. 5 shows the section CC from Fig. 3 with cylinder head 1, pressure channel 4, water pump screw 9 as parts of module 15.

[0021] The pressure channel 4 is directly connected to the water volume of the cylinder crankcase.

[0022] In Fig. 6 Module 15 is selected from the Fig. 3, 4 and 5 with impeller 10, drive shaft with bearing 11 and housing cover 12. List of reference symbols

[0023] 1Cylinder head 2Water pump 3Suction channel 4Pressure channel 5Thermostat 6Inlet channels 7Water channels 8Connecting piece 9Water pump screw 10Impeller 11Drive shaft with bearing 12Housing cover 13Front opening 14Water pump housing 15Module

Claims

1. Internal combustion engine comprising: at least one cylinder head (1) with a water pump (2) integrated into the cylinder-head housing, with a water-pump housing (14) of the water pump (2) that has a water-pump worm (9), a pressure channel (4), a suction channel (3) and an end-face opening (13), wherein the water-pump housing (14) is a constituent part of a cast body of the cylinder head (1), and with a module (15) that has an impeller (10), a drive shaft with a bearing arrrangement(11) and a housing cover (12), wherein the module (15) is fitted into the water-pump housing (14) via the end-face opening (13).

2. Internal combustion engine according to one or more of the preceding claims, characterized in that the water pump (2) contains at least one integrated thermostat (5).

3. Internal combustion engine according to one or more of the preceding claims, characterized in that the housing cover (12) of the module (15) is designed to be screwable to the water-pump housing (14) by means of screws.

4. Internal combustion engine according to one or more of the preceding claims, characterized in that the water pump (2), by means of a water channel (7), is connected directly to the cooling-water volume of the cylinder head (1) through a channel in the cylinder crankcase, wherein the pressure channel (4) is connected directly to the cooling-water volume of the cylinder crankcase.