JP2005530082A - Cylinder / Crankcase for Internal Combustion Engine - Google Patents

Abstract

The present invention comprises a plurality of cylinders having a longitudinal hollow cross-section in the form of a side hollow reinforcing profile and a chevron-shaped hollow cross-section in the form of a reinforcing profile near the main bearing surface substantially facing the cylinder. The present invention relates to a cylinder crankcase for an internal combustion engine. The side camshaft is disposed below the upper hollow cross-section that extends in the longitudinal direction, and the angled hollow cross-section is divided into two near the bearing of the camshaft.

Description

  The present invention relates to a cylinder crankcase for an internal combustion engine having the features of the preamble of claim 1.

  Patent Document 1 discloses a cylinder / crankcase for a multi-cylinder internal combustion engine having a hollow cross-sectional portion continuous in the longitudinal direction and a side reinforcing element having a mountain-shaped hollow cross-sectional portion. These hollow cross sections are integrated into a casting that forms a cylinder / crankcase. A plurality of hollow cross-sections extending in the longitudinal direction are provided on the side surface, and a chevron-shaped hollow cross-section is provided in each main bearing, the hollow cross-sections extending in the longitudinal direction extend in the longitudinal direction of the engine, In line with the contour of the side wall of the cylinder / crankcase, in other words, the head is initially parallel to the cylinder direction and then spreads outward near the crank space. The hollow cross-section cavities are designed so that the medium can flow continuously through them.

German Patent Invention No. 43 24 609 C2 Specification

  On the other hand, an object of the present invention is to provide a cylinder / crankcase having a reinforcing structure formed by a longitudinal direction and a chevron-shaped hollow cross section where a side camshaft can be attached as close as possible to a cylinder. That is.

  This object is achieved by a cylinder crankcase having the features of claim 1.

  The crankcase according to the invention is characterized in that the side camshaft is mounted below the upper hollow cross section, the hollow cross section extending in the longitudinal direction extends in the longitudinal direction of the engine, Along the contour of the side wall of the crankcase, the angled hollow cross section is divided into two near the camshaft bearing structure, in other words, at the head it is initially parallel to the cylinder direction and then near the crank space. It spreads outward. If the side camshaft is mounted under the longitudinally continuous hollow section instead of the exterior adjacent to the longitudinally continuous hollow section, it is advantageous to design a narrower engine, which is a cam This is because the shaft does not greatly increase the profile of the internal combustion engine, but this does not allow the center height of the camshaft, ie the vertical position, to be freely defined. In a plane that spans between two adjacent longitudinal cross-sections, the angled hollow cross-section extends perpendicular to the longitudinal cross-section in each main bearing plane so that the camshaft is longitudinal If it is arranged under the hollow cross-section portion that continues to, the chevron-shaped hollow cross-section portion is interrupted. The chevron hollow cross section, like the camshaft bearing, is arranged in the main bearing plane, i.e. a plane perpendicular to the longitudinal direction of the engine and spanning between the two cylinders. According to the present invention, the angled hollow cross section is divided into two near the cam bearing, so that a continuous flow relationship with as constant a cross section as possible is maintained, so that in the case of cylinder or crankcase deflection or twisting In addition, the load generated with respect to the angled hollow cross section is uniform or symmetric. The camshaft passage, i.e. the space in which the camshaft moves, can also be designed as a hollow cross-section that continues in the longitudinal direction, so that a hollow cross-section that continues in the second longitudinal direction is located below the upper hollow cross-section that continues in the longitudinal direction. Constitute. In this way, a single casting core can be used to produce a reinforced structure with a longitudinal and chevron hollow cross section, resulting in manufacturing costs and quality, or as a result of the mutual relationship between individual casting cores. This is very advantageous with regard to the tolerances for the position of.

  In one configuration of the present invention, as viewed from the longitudinal direction of the engine, in any case, a part of the divided chevron hollow cross section is disposed in front of the bearing structure part of the camshaft, and a part is a bearing structure of the camshaft. Arranged behind the part. That is, despite the crossing of the camshaft, a continuous chevron-shaped hollow cross-section is maintained, and the space that needs to bypass the bearing structure of the camshaft does not hinder the outer shape of the engine. The bearing supporting the camshaft is integrally joined to the cylinder / crankcase toward the cylinder side and to the outer wall of the angled hollow cross section on the opposite side.

  In another configuration of the invention, the chevron hollow cross section is divided into at least upper and lower cavities by a sealing element. Longitudinal and chevron hollow cross-sections, due to their inherent stability, without compromising the advantages of common integral molding that allows easy and precise (raw) castings to be manufactured by introducing sealing elements It facilitates the division of a part cavity into two independent parts through which different media pass.

  According to another configuration of the present invention, an upper hollow cross-section portion that is continuous in the longitudinal direction and a cavity that is disposed on the opposite side of the upper hollow cavity of the chevron-shaped hollow cross-section portion from the bearing structure portion of the camshaft of the cylinder crankcase are passed. Can flow the refrigerant. In this method, the cavity of the reinforced hollow cross section extends over the entire length of the cylinder / crankcase and has a substantially constant cross section, so that it can be ideally used as a refrigerant distribution path to individual cylinders. The refrigerant needs to be supplied as uniformly as possible on one side of the engine, and the refrigerant returns to the original state, for example, via a cylinder head.

  In another configuration of the present invention, the longitudinal direction and the lower cavity of the angled hollow cross section communicate with the oil pan of the cylinder / crankcase and function as a pressurized oil supply passage or a ventilation passage for crankcase ventilation. .

  In another configuration of the present invention, the transmission element of the valve mechanism is a hollow cross section continuous in the upper cavity and / or longitudinal direction of the angled hollow cross section on the side where the bearing structure of the camshaft of the cylinder / crankcase is disposed. Placed in the section. Since the camshaft is mounted in or below the hollow cross-section portion that is continuous with the hollow cross-section portion that is continuous with the upper longitudinal direction, that is, both contour forming portions are filled with lubricating oil or oil mist, These spaces can be used as a transmission element of a valve mechanism such as a push rod. In other words, the size of the external shape of the internal combustion engine or the crankcase does not increase greatly despite the hollow cross-sections, chevron-shaped cross-sections, side camshafts, and tappet mechanisms that are continuous in the longitudinal direction.

  Further features and feature combinations will become apparent from the description and the drawings. Specific exemplary embodiments of the invention are shown in the drawings in a simplified form and are explained in more detail in the following description.

  FIG. 1 shows a cylinder / crankcase 1 having a plurality of cylinders 2 and a crank space 3. In any case, the main bearing 4 is disposed between the two cylinders 2 in the crank space 3. A cavity 5 known as a camshaft bearing passage is a place where a camshaft (not shown) is attached, and a transition portion from the cylindrical upper part of the cylinder / crankcase 1 to the crank space 3 on the outer surface side of the cylinder / crankcase. Placed in. The cavity 5 is formed as a hollow region continuous in the longitudinal direction. Above this cavity 5, there is an upper hollow cross-section 6 that continues in the longitudinal direction, and functions to reinforce the cylinder / crankcase 1 in the longitudinal direction, and in particular to reinforce the crankcase upper surface 7. Shape. Further, a tappet (not shown) of the valve drive mechanism is accommodated in the hollow cross-sectional portion 6 that is continuous in the longitudinal direction. A guide 8 and a passage 9 for tappets are also provided in the cylinder / crankcase 1. Another hollow cross-section 10 that is continuous in the longitudinal direction also serves as a reinforcement, and is disposed at the lower end of the cylinder / crankcase.

  Similarly, the three hollow cross-sectional portions 10, 11, and 12 connected in the longitudinal direction are also arranged on the opposite side of the cylinder / crankcase 1 from the cam shaft. Are arranged at the lower end of the cylinder / crankcase corresponding to the hollow cross-sectional portion that continues in the longitudinal direction. Since neither a camshaft nor a tappet is installed on this side of the cylinder / crankcase, the hollow cross-sections 11 and 12 that are continuous in the longitudinal direction have a simple design, that is, they are straight without any sudden change in the cross-section. In the passage 13, the refrigerant flows into the cooling jacket 14 that surrounds the cylinder 2 from the hollow cross-sectional portion 11 that is designed as a refrigerant transport passage and extends in the longitudinal direction.

  FIG. 2 shows a longitudinal cross-sectional view of the cylinder / crankcase 1 according to the invention shown in FIG. 1 through a cam bearing passage 5 existing over one cylinder 2 and two substantially half cylinders 2. It shows with. The chevron hollow cross section 15 extends from the hollow cross section 6 continuous in the longitudinal direction to the lower end of the cylinder / crankcase 1 through the cavity of the cam bearing passage 5. The chevron hollow section 15 is arranged in the main bearing plane between the two cylinders 2. A camshaft (not shown) is attached to a cam bearing 16, which is connected to the cylinder / crankcase 1 by casting in the areas before and after the cross section shown. Lubricating oil for the camshaft is supplied through a hole 17 in the cam bearing 16. A tappet (not shown) for driving the intake and exhaust valves is guided by the guide 8 and protrudes from the cylinder crankcase 1 into the cylinder head (not shown) through the passage 9. The straight contour of the chevron hollow cross section 15 from the hollow cross section 6 extending in the longitudinal direction to the lower end of the cylinder crankcase 1 is interrupted by the cam bearing passage 5, and the chevron hollow cross section 15 is camped in the region of the cam bearing 16. There are two parts around the bearing. When viewed from the direction of the cam bearing passage 5, a part of the cavity of the angled hollow cross section 15 passes in front of the cam bearing 16, and a part passes behind the cam bearing 16. As a result, the flow from top to bottom has a continuous and substantially constant cross section.

  FIG. 3 shows the casting core 18 of the reinforcing structure of the cylinder / crankcase 1 in the form of a perspective view seen from the outside on the camshaft side. The casting core 18 is particularly composed of a chevron-shaped hollow cross-section portion 15 ′ and portions for the hollow cross-section portions 5 ′, 6 ′, 10 ′ continuous in the longitudinal direction. Furthermore, the drawing shows the passage 9 'for the valve drive and the core for the guide 8'. Since the guide 8 'includes an integrally cast portion that is subsequently drilled, it is formed as a hollow or hollow casting core made of, for example, mold sand.

  FIG. 4 shows another casting core 19 of the reinforcing structure of the cylinder / crankcase 1 in the form of a perspective view seen from the inside opposite to the camshaft. The casting core 19 is particularly composed of a chevron-shaped hollow cross-section portion 15 ′ and portions for the hollow cross-section portions 10 ′ and 11 ′ continuous in the longitudinal direction. The refrigerant passage 13 ′ is disposed in a portion for the hollow cross-sectional portion 11 ′ that is continuous in the upper longitudinal direction. The protrusion 20 'protruding from the casting core is an opening in the finished cylinder / crankcase, and is used to hold and connect the various casting cores together during casting, and the finished cylinder / crank. In the case, for example, it becomes an entrance / exit for transferring the refrigerant from the cylinder / crankcase to the cylinder head.

  FIG. 5 shows the casting core 19 of FIG. 4 in the form of a side view, sideways of the engine, facing from the inside to the outside. In addition to the portions of the hollow cross-sections 10 ', 11' and the chevron-shaped hollow cross-section 15 'continuous in the longitudinal direction, this figure further shows that from the chevron-shaped hollow cross-section 15' to the hollow cross-section 11 'continuous in the upper longitudinal direction The transition position 21 is shown. According to the present invention, on the opposite side of the camshaft, the hollow structure with the longitudinal direction and the angled hollow cross section is cast around the casting core 19, but the cavity made of the casting core is At the transition position 21 it is divided into two independent cavities by the sealing element.

It is a perspective view of the cylinder crankcase by this invention. FIG. 2 is a longitudinal section through the cam bearing passage according to line II-II in FIG. 1. It is a perspective view of the casting core on the camshaft side of the cylinder / crankcase. It is a perspective view of the core for casting on the opposite side to the camshaft of a cylinder crankcase. It is a side view of the core for casting on the opposite side to the camshaft of a cylinder crankcase.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder / Crankcase 2 Cylinder 3 Crank space 4 Main bearing 5 Cavity 6 (Upper) hollow cross section 7 Crankcase upper surface 8 Tappet guide 9 Tappet passage 10, 11, 12 Hollow cross section 15 Angle hollow cross section 16 Cam bearing

Claims (5)

A cylinder crankcase (1) for an internal combustion engine having a plurality of cylinders (2), comprising a plurality of longitudinally extending hollow cross-sectional portions (6, 10, 11, 12) for side hollow reinforcement, A cylinder crankcase (1) comprising at least one angled hollow cross section (15) for reinforcement near the main bearing plane arranged towards the cylinder,
The side camshaft is attached under the upper hollow cross section (6) that runs in the longitudinal direction,
The angled hollow cross section (15) is divided into two near the bearing structure (16) of the camshaft. In each case, the cylinder / crankcase, as viewed from the longitudinal direction of the engine, A part of the angled hollow cross section passes in front of the bearing structure part of the camshaft with respect to the axial direction of the camshaft, and a part passes behind the bearing structure part of the camshaft. Cylinder / crankcase   2. Cylinder and crankcase according to claim 1, characterized in that the chevron hollow section (15) is divided by a sealing element into at least one upper cavity and one lower cavity.   A hollow cross section (11) continuous in the upper longitudinal direction, and an upper cavity of the chevron hollow cross section (15) disposed on the opposite side of the bearing structure (16) of the camshaft of the cylinder / crankcase The cylinder / crankcase according to claim 2, wherein refrigerant can flow through the cylinder.   4. The cylinder / crankcase according to claim 2, wherein a lower cavity of the mountain-shaped hollow section (15) communicates with an oil pan of the cylinder / crankcase. The transmission element of the valve mechanism is located on the side of the camshaft of the cylinder / crankcase where the bearing structure (16) is disposed, and in the upper cavity of the angled hollow cross section (15) and / or in the longitudinal direction. 5. The cylinder / crankcase according to claim 1, wherein the cylinder crankcase is arranged in a continuous upper hollow cross-section (6).

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