Combustion engine housing having cylinder cooling

Abstract

A combustion engine housing with cylinder cooling includes at least one cylinder. The cylinder cooling channel has a distribution cross-sectional area having a cross-sectional area through which coolant can flow, in a first cross-sectional plane that is perpendicular to the cylinder axis. In a second cross-sectional plane, which is perpendicular to the cylinder axis and which is arranged in relation to the vertical direction between the first cross-sectional plane and the coolant outflow opening, has a throttle cross-sectional area, which is a cross-sectional area through which coolant can flow. The throttle cross-sectional area is smaller than the distribution cross-sectional area.

Claims

1. A combustion engine housing with cylinder cooling comprising: at least one cylinder, wherein the at least one cylinder is set up to accommodate a working piston moving in the vertical direction along a cylinder axis between a lower dead point and an upper dead point, wherein the at least one cylinder is surrounded in the circumferential direction by the combustion engine housing and a cylinder cooling channel is provided for cylinder cooling in the combustion engine housing, wherein this cylinder cooling channel partially or completely surrounds the at least one cylinder in the circumferential direction, wherein the cylinder cooling channel has a cooling channel height extent in the direction of the cylinder axis and orthogonal thereto a cooling channel width extent and further the cylinder cooling channel comprises a coolant inflow opening and a coolant outflow opening, wherein the coolant inflow openings and the coolant outflow openings are coupled directly to a cylinder wall and are spaced apart in the vertical direction from the coolant outflow openings, wherein the cylinder cooling channel has a distribution cross-sectional area, having a cross-sectional area through which coolant can flow, in a first cross-sectional plane that is perpendicular to the cylinder axis, in a second cross-sectional plane, which is perpendicular to the cylinder axis and which is arranged in relation to the vertical direction between the first cross-sectional plane and the coolant outflow opening, has a throttle cross-sectional area, which is a cross-sectional area through which coolant can flow, and the throttle cross-sectional area is smaller than the distribution cross-sectional area.

2. The combustion engine housing according to claim 1, wherein a cooling channel throttle area is provided between the coolant inflow opening and the coolant outflow opening in the vertical direction, the throttle cross-sectional area is arranged in this cooling channel throttle area, and in the cooling channel throttle area the cooling channel width dimension is smaller than a cooling channel width dimension in the distribution cross-section area.

3. The combustion engine housing according to claim 2, wherein the combustion engine housing comprises two cylinders spaced apart from each other in a longitudinal direction, an imaginary longitudinal plane is spanned by this longitudinal direction and the cylinder axis of one of the cylinders, and the coolant inflow opening and the coolant outflow opening are arranged on different sides of this longitudinal sectional plane, so that a cross-scavenged combustion engine housing results in relation to a coolant flow through the cylinder cooling channel.

4. The combustion engine housing according to claim 3, wherein in a specific area in relation to the circumferential direction or over the entire circumference of the cylinder, the cooling channel width dimension in the cooling channel throttle area decreases continuously in the vertical direction from the coolant inflow opening to the coolant outflow opening, and the cooling channel throttle area extends over at least 10% of the height dimension of the cylinder.

5. The combustion engine housing according to claim 4, wherein multiple coolant inflow openings and multiple coolant outflow openings are provided.

6. The combustion engine housing according to claim 5, wherein the number of coolant inflow openings corresponds to the number of cylinders of the combustion engine housing.

7. The combustion engine housing according to claim 6, wherein the number of coolant outflow openings corresponds to the number of cylinders of the combustion engine housing.

8. The combustion engine housing according to claim 7, wherein the combustion engine housing is bounded in the vertical direction at an upper side by a cylinder head supporting surface, and the cylinder cooling channel extends fully up to this cylinder head supporting surface.

9. The combustion engine housing according to claim 7, wherein the combustion engine housing is bounded in the vertical direction at an upper side by a cylinder head supporting surface, and the cylinder cooling channel does not extend to this cylinder head supporting surface, at least in sections, so that in these sections the cylinder cooling channel is bounded in relation to the cylinder head supporting surface by an upper web that extends to the cylinder head supporting surface.

10. The combustion engine housing according to claim 9, wherein multiple cylinders are provided adjacent to each other in a longitudinal direction, and the upper web is arranged in a section between two adjacent cylinders in relation to the circumferential direction around one of these cylinders.

11. The combustion engine housing according to claim 10, wherein an outer sheath surface of the cylinder cooling channel has a conical shape, an inner sheath surface of the cylinder cooling channel has a cylindrical shape, and as a result of the cylindrical shape the cylinder cooling channel has a narrowing shape in the vertical direction from the coolant inflow opening to the coolant outflow opening.

12. A combustion engine with internal combustion in the form of a reciprocating piston design and with multiple cylinders in which combustion chambers are formed, with a combustion engine housing according to claim 11.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIGS. 1A to 1E show different subsections of a first variant of the combustion engine housing with a cylinder cooling channel;

(2) FIGS. 2A to 2D show different subsections of a first variant of the combustion engine housing with a cylinder cooling channel; and

(3) FIG. 3 shows a cross-sectional representation of a cross-scavenged combustion engine housing with a cylinder cooling channel.

DETAILED DESCRIPTION OF THE DRAWINGS

(4) In FIG. 1 a) a perspective partial sectional representation of 2 cylinders arranged in a combustion engine housing (2a, 2b) is shown. A cylinder cooling channel 3 for cylinder cooling is arranged in the combustion engine housing 1. The cylinder cooling channel 3 is set up to be flowed through by a coolant during normal operation of a combustion engine with such a combustion engine housing 1. This coolant absorbs and dissipates heat generated by the combustion of fuel in the cylinder. The cylinder cooling channel 3 comprises a coolant inflow opening 4a and a coolant outflow opening 5a. The coolant flows through the cylinder cooling channel 3 from the coolant inflow opening 4a to the coolant outflow opening 5a during normal operation of the combustion engine.

(5) In FIG. 2 b) a partial section view of the combustion engine housing 1 is shown. In this view, the first cross-sectional plane I and the second cross-sectional plane II can be recognized. The two cross-sectional planes I, II are each oriented orthogonally to the cylinder axis 6a of the cylinder 2a. The first cross-sectional plane I is arranged in the area of the coolant inflow opening 4a and in this plane I the cylinder cooling channel 3 has the cooling channel width dimension 3vb. This cooling channel width dimension 3vb is larger than the cooling channel width dimension 3db in the second cross-sectional plane II, which is arranged between the first cross-sectional plane I and the coolant outflow opening 5a and thus in the cooling channel throttle area 3d.

(6) It can be seen that the cylinder cooling channel 3 in the cooling channel throttle area 3d has a continuously decreasing cooling channel width dimension. The cooling channel throttle area 3d extends in the vertical direction over the distance 3dh, which corresponds to about 50% of the height dimension 2h of the cylinder 2a. Due to this embodiment of the cylinder cooling channel 3, it is achieved that a uniform coolant flow can form from the coolant inflow opening 4a to the cooling outflow opening 5a. In the cooling channel distribution area 3v, the flow resistance for the coolant is lower than in the coolant channel throttle area 3d, in particular favoring homogenization of the coolant flow.

(7) FIG. 1 c) shows a plan view of the section of the combustion engine housing 1 that is shown in FIG. 1 a). In the view shown, a part of the first cylinder 2a and of the second cylinder 2b can be recognized, wherein these are arranged adjacent to each other in the longitudinal direction 12. Each of the cylinders 2a, 2b has a cylinder axis 6a, 6b. In this FIG. 1 c) the section line A-A can be recognized, wherein the view corresponding to this section line is shown in FIG. 1 d). The section A-A runs through the cylinder web 8, i.e. through the wall of the combustion engine housing between the first cylinder 2a and the second cylinder 2b.

(8) In FIG. 1 d) a further partial sectional view of the combustion engine housing 1 is shown. Through the section A-A shown, the shape of the cylinder cooling channel 3 can be recognized in the so-called cylinder web 8. The vertical direction 10 appears in the direction of the first cylinder axis 6a and orthogonal to this is the width direction 11. It can further be recognized that the cylinder cooling channel 3 extends into the cylinder head supporting surface 7. The cylinder head supporting surface 7 is thus interrupted in the area of the cylindrical web 8 by the cylinder cooling channel 3.

(9) In FIG. 1 e) a further perspective partial sectional representation of a section of the combustion engine housing 1 is shown. In this sectional representation a part of the first cylinder 2a and a part of the second cylinder 2b can be recognized, wherein each of these extends along the first cylinder axis 6a and along the second cylinder axis 6b respectively. The cylinder cooling channel 3 is bounded radially to the first cylinder axis 6 by the outer cooling channel sheath surface 3 I and the inner cooling channel sheath surface 3 II.

(10) Here, the outer cooling channel sheath surface 3 I is partially conical (cooling channel throttle area) and the inner cooling channel sheath surface 3 II is cylindrical, so that narrowing of the cross-section of the cylinder cooling channel 3 in the vertical direction 10 from the coolant inflow opening 4a to the coolant outflow opening 5a results. Both the first cylinder 2a and the second cylinder 2b have a height dimension 2h. In particular, a particularly uniform distribution of the coolant when flowing through the cylinder cooling channel 3 results from this embodiment of the cylinder cooling channel 3 with the cylinder cooling channel narrowing in the vertical direction.

(11) FIG. 2 shows a further embodiment of the invention, wherein the differences from the embodiment of the invention shown in FIG. 1 will substantially be discussed below.

(12) In FIG. 2c) the section line B-B is drawn in the cylinder web 8, wherein the partial sectional view of the combustion engine housing resulting from this section line B-B is shown in FIG. 2 d).

(13) In FIG. 2 d) it can be recognized that the cylinder cooling channel 3 is delimited relative to the cylinder head supporting surface 7 by the upper web 9. Thus, unlike in the embodiment of the invention illustrated in FIG. 1, the cylinder cooling channel 3 does not extend in this area (cylinder web) into the cylinder head supporting surface 7, but ends before this and is thus bounded by the upper web 9, and the cylinder head surface 7 is thus enlarged compared to the variant of the invention represented in FIG. 1.

(14) The partial sectional view shown in FIG. 2 b) corresponds to the view shown in FIG. 1 b), since in this section there are no differences between the two different embodiments of the invention shown.

(15) In FIG. 3, a plan view of four cylinders 2a, 2b, 2c, 2d arranged in a row is shown, as is the case with an 8 cylinder V engine with four cylinders in a cylinder bank or in a 4-cylinder in-line engine. The 4 cylinders 2a, 2b, 2c, 2d are arranged adjacent to each other in the longitudinal direction 12 and each has a cylinder axis 6a, 6b, 6c, 6d, along each of which a piston (not shown) moves reciprocally during normal operation of the combustion engine, and by this movement sets a crankshaft (not shown) in rotation.

(16) The cylinder cooling channel 3 comprises a number of coolant inflow openings 4a, 4b, 4c, 4d and a number of coolant outflow openings 5a, 5b, 5c, 5d. By means of the arrow representations, the coolant flow from the coolant inflow openings 4a, 4b, 4c, 4d to the coolant outflow openings 5a, 5b, 5c, 5d is shown as it is set up during normal operation of the combustion engine. The number of coolant inflow openings 4a, 4b, 4c, 4d and the number of coolant outflow openings 5a, 5b, 5c, 5d corresponds to the number of cylinders 2a, 2b, 2c, 2d. This embodiment of the combustion engine housing results in a cross-scavenged combustion engine housing.

REFERENCE CHARACTER LIST

(17) 1 Combustion engine housing 2a,2b, 2c,2d Cylinders of the combustion engine housing 2h Cylinder height dimension 3 Cylinder cooling channel 3d Throttle area of the cylinder cooling channel 3v Distribution area of the cylinder cooling channel 3db Cooling channel width dimension of the cylinder cooling channel in the cooling channel throttle area 3dh Height dimension of the cooling channel throttle area 3vb Cooling channel width dimension in the cylinder cooling channel distribution area 3 I Outer cylinder cooling channel area 3 II Inner cylinder cooling channel sheath surface 4a,4b, 4c,4d Coolant inflow opening 5a,5b, 5c,5d Coolant outflow opening 6a,6b, 6c,6d Cylinder axes of the cylinders 7 Cylinder head supporting surface 8 Cylinder web 9 Upper web 10 Vertical direction 11 Width direction 12 Longitudinal direction I First cross-sectional plane II Second cross-sectional plane

(18) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.