CN1656309A - Cylinder block for an internal combustion engine - Google Patents

Abstract

In a cylinder-block for an internal combustion engine with a plurality of cylinders having longitudinal profiled sections in the form of lateral hollow reinforcement structures and vertical sections in the form of profiled reinforcement structures, in the region of a main bearing plane means are provided for supporting a lateral camshaft beneath the upper longitudinal profiled section, and, in the region of the bearing structure for the camshaft the vertical profiled section is divided in two.

Description

Cylinder block crankcase of internal combustion engine

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

A cylinder block crankcase of a multi-cylinder internal combustion engine is known from patent document DE 43 24 609 C2, which has lateral profiles in the form of a longitudinal profile (Laengsprofil, longitudinal profile) and a main profile (Hochprofil, vertical profile) To strengthen the parts. These hollow profiles are integral with the casting forming the crankcase of the cylinder block. A plurality of longitudinal profiles are provided laterally, one main profile on each main bearing, wherein the longitudinal profiles extend in the longitudinal direction of the internal combustion engine, the main profiles follow the direction of the crankcase side walls of the cylinder block, i.e. From the top, it is parallel to the direction of the cylinder at the beginning, and it flares out when it reaches the crankshaft cavity area. The cavity of the shaped part is configured such that a fluid can flow through it continuously.

In contrast to this, the object of the present invention is to provide a cylinder block crankcase with a reinforcement structure consisting of a longitudinal profile (Laengsprofil, longitudinal profile) and a main profile (Hochprofil, vertical profile), in which it is possible to Install the lateral camshaft as close to the cylinder as possible.

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

The crankcase according to the invention is characterized in that a lateral camshaft is mounted below the hollow upper longitudinal profile and that the hollow main profile is divided into two parts in the bearing area of the camshaft, wherein the longitudinal profile Extending in the longitudinal direction of the internal combustion engine, the main profile follows the course of the crankcase side walls of the cylinder block, ie from above parallel to the direction of the cylinders, and flares out in the region of the crankcase. Supporting the lateral camshafts below the longitudinal profile, instead of on the outside next to the longitudinal profile, results in the advantage of a narrower machine structure, since the camshaft does not significantly enlarge the outer profile of the internal combustion engine, but the height of the center of the camshaft, That is, the position in the vertical direction is no longer freely determined. Since the main profile in the respective main bearing plane is still perpendicular to the plane spanned by two adjacent longitudinal profiles, the main profile is disconnected when the camshaft is arranged below the longitudinal profile . Like the bearing of the camshaft, the main profile is arranged in the main bearing plane, ie in the plane spanning between the two cylinders and perpendicular to the longitudinal direction of the internal combustion engine. According to the invention, the main profile is divided into two parts in the area of the camshaft bearing, so that a continuous fluid connection can be maintained with as constant a cross-section as possible, and the main profile can be maintained in the event of bending or torsion of the cylinder block and crankcase. It is subjected to a uniform or symmetrical load. The camshaft channel, ie the space in which the camshaft can move, can also be formed as a longitudinal profile, ie as a second longitudinal profile below the upper longitudinal profile. In this way, a one-piece casting core can be used to produce the reinforcement structure including the main molding and the longitudinal molding, which has great advantages in terms of reducing production costs, improving quality and reducing the cost of individual castings. Position error between cores.

In one embodiment of the invention, viewed in the longitudinal direction of the machine, a section of the split main profile is arranged in front of the camshaft bearing and a section is arranged behind the camshaft bearing. In this way, despite the crossover to the camshaft, a closed main profile is obtained, and the space required to bypass the camshaft bearing does not affect the external contour of the internal combustion engine. The bearing supporting the camshaft is connected integrally with the cylinder block crankcase on the outer wall of the main profile on the opposite side in the direction of the cylinder side.

In a further embodiment of the invention, the main molding is divided by the closing part into at least one upper cavity and one lower cavity. The introduction of closure elements makes it easy to divide the cavity of the longitudinal profile and the main profile into two separate sections that can be introduced with different media, without losing the advantages of using a common casting core, namely ease of manufacture and due to Its inherent stability enables accurate casting blanks.

In a further embodiment of the invention, coolant can flow through an upper cavity of a main profile arranged on the side of the crankcase of the cylinder block opposite the camshaft bearing and an upper longitudinal profile. In this way, the cavity of the reinforcement profile can be ideally used as a line for distributing coolant to the individual cylinders, since it extends over the entire length of the cylinder block crankcase and has a cross-section of almost constant size . A coolant supply that is as uniform as possible is only required on the side of the internal combustion engine, and the return flow of the coolant can be realized, for example, via the cylinder head.

In a further embodiment of the invention, the longitudinal profile and a lower cavity of the main profile are connected to an oil chamber of the crankcase of the cylinder block as a pressure oil line or a line for venting the crankcase.

In a further embodiment of the invention, on the side of the crankcase of the cylinder block on which the camshaft bearing is arranged, the transmission elements of the valve train are arranged in an upper cavity of the main profile and/or in the longitudinal profile. Since the camshaft is mounted inside or below the longitudinal profile, which is connected to the upper profile, in other words, both longitudinal profiles are filled with lubricant or oil mist, so that it is advantageously possible to Use this space for the transmission elements of the valve train, such as pushrods. This means that despite the presence of longitudinal profiles, main profiles, a lateral camshaft and push rod arrangement, the external contours of the internal combustion engine and crankcase are not significantly enlarged.

Further features and combinations of features are given by the description and the drawings. Specific embodiments of the invention are shown simplified in the drawings and described in more detail in the following description. in:

Fig. 1 is the perspective view of the cylinder block crankcase of the present invention,

Fig. 2 A longitudinal sectional view through the camshaft channel in the direction of line II-II in Fig. 1,

Figure 3 Perspective view of the casting core on the camshaft side of the cylinder block crankcase,

Figure 4 Perspective view of the casting core on the side opposite the camshaft of the cylinder block crankcase,

Figure 5 Side view of the casting core on the side opposite the camshaft of the cylinder block crankcase.

FIG. 1 shows a cylinder block crankcase 1 with a plurality of cylinders 2 and a crank chamber 3 . In the crank chamber 3 there is a main bearing 4 always located between the two cylinders. In the transition from the cylindrical upper part of the cylinder block crankcase 1 to the crank chamber 3, a cavity 5 is provided on the outside of the cylinder block crankcase, the so-called camshaft channel, in which a camshaft, not shown, is accommodated . The cavity 5 is formed as a longitudinal profile. Above the cavity 5, there is also an upper longitudinal forming portion 6 for longitudinally reinforcing the cylinder block crankcase 1, especially the cylinder top 7, which is also hollow. In addition, a push rod for operating a valve, not shown in the figure, is attached to the vertically formed portion 6 . The guide hole 8 and the channel 9 of the push rod are arranged in the cylinder block crankcase 1 . The lower end of the cylinder block crankcase 1 is also provided with a hollow longitudinal forming portion 10 for reinforcement.

On the side opposite to the camshaft of the cylinder block crankcase 1, three hollow vertical forming parts 10, 11 and 12 are also provided, wherein the vertical forming part 10, which is arranged at the lower end of the cylinder block crankcase 1, is connected to the side of the camshaft. Corresponding to the vertical forming part. Since neither pushrods nor camshafts are present on this side of the cylinder block crankcase, the longitudinal profiles 11 and 12 are simple, ie are designed rectilinearly without jumps in cross-section. At the channel 13 , the coolant flows from the longitudinal profile 11 configured as a coolant distribution duct into the cooling jacket 14 surrounding the cylinder 2 .

2 is a longitudinal section through the camshaft passage 5 of the cylinder block crankcase 1 according to the invention according to FIG. 1 , showing a complete cylinder and two adjacent cylinder halves 2 . The hollow main profile 15 proceeds from the longitudinal profile 6 through the cavity of the camshaft channel 5 to the base of the cylinder block crankcase 1 . The main profile 15 is arranged in the main bearing plane between the two cylinders 2 . The camshaft, not shown, is mounted in a camshaft bearing 16, which is in turn joined to the cylinder block crankcase 1 by casting at the front and rear of the section in the figure. The camshaft is supplied with lubricant through bores 17 in the camshaft bearing 16 . A push rod not shown for operating the gas exchange valve is inserted into the guide hole 8, passes through the channel 9, protrudes from the cylinder block crankcase 1 and enters the not shown cylinder head. The camshaft channel 5 interrupts the linear extension of the main profile 15 from the longitudinal profile 6 to the bottom edge of the cylinder block crankcase 1 and the main profile 15 is divided into two parts at the camshaft bearing 16 around the camshaft bearing 16 . Viewed in the direction of the camshaft channel 5 , the cavity of the main profile 15 is partly in front of the camshaft bearing 16 and partly behind the camshaft bearing 16 . This results in a flow cross section that is continuous from top to bottom and has an almost constant size.

FIG. 3 is a perspective view of the casting core 18 of the reinforcing structure of the cylinder block crankcase 1 viewed from the camshaft side. The casting core 18 essentially comprises several sections for the main molding 15 ′ and the longitudinal moldings 5 ′, 6 ′, 10 ′. Furthermore, the core of the channel 9' and the guide hole 8' for the valve operating device are shown. Since the guide hole 8' is subsequently drilled through the sprue, the guide hole 8' is a cavity or a recess in a casting core, for example made of molding sand.

4 is a perspective view of the interior of the casting core 18 of the reinforcement structure of the cylinder block crankcase 1 viewed from the opposite side of the camshaft. The casting core 19 essentially comprises several sections for the main profile 15' and the longitudinal profiles 10', 11'. Coolant channels 13' are provided on a section of the upper longitudinal profile 11'. The pin head 20' protruding from the casting core creates a gap on the completed cylinder block crankcase, which plays a role in supporting and connecting different casting cores during the casting process, and starts to rotate on the completed cylinder block crankcase The function of the joint, for example, is to transfer coolant from the cylinder block crankcase to the cylinder head.

FIG. 5 is a side view of the casting core 19 in FIG. 4 from the inside to the outside in the transverse direction of the internal combustion engine. In addition to the sections of the longitudinal profiles 10 ′, 11 ′ and the main profile 15 ′, FIG. 5 also shows a transition point 21 from the main profile 15 ′ to the upper longitudinal profile 11 ′. According to the invention, on the side opposite the camshaft, the profile structure comprising the longitudinal profile and the main profile is produced by casting around a casting core 19, however the cavity formed by the casting core is replaced by the transition position The closing part at 21 is divided into two separate cavities.

Claims (6)

1. the cylinder block crankshaft case (1) of multi cylinder (2) internal-combustion engine, have a plurality of vertical forming parts (6,10,11,12) and at least one main forming part (15), wherein vertical forming part is made the form of the hollow reinforcing forming part of side direction, main forming part is made the form of the reinforcing forming part in the zone that is in main supporting plane, described main supporting plane is roughly directed on the cylinder direction, it is characterized in that, a side direction camshaft is installed in a below of going up vertical forming part (6), and main forming part is divided into two parts in the zone of camshaft supporting (16).

2. cylinder block crankshaft case according to claim 1 (1), it is characterized in that, vertically see along internal-combustion engine, camshaft axially on, main forming part (15) has portion's section to be positioned at the front of camshaft supporting (16), has portion's section to be positioned at the back of camshaft supporting (16).

3. according to one of claim 1 to 2 described cylinder block crankshaft case (1), it is characterized in that main forming part (15) is divided at least one upper plenum and a following cavity by closing feature.

4. cylinder block crankshaft case according to claim 3 (1), it is characterized in that freezing mixture can flow through main forming part (15) upper plenum on that be arranged on cylinder block crankshaft case and the opposed side of camshaft supporting (16) and one and go up vertical forming part (11).

5. according to claim 3 or 4 described cylinder block crankshaft cases (1), it is characterized in that a following cavity of main forming part (15) is connected with a grease chamber of cylinder block crankshaft case.

6. according to one of claim 1 to 5 described cylinder block crankshaft case (1), it is characterized in that, in a side that is provided with camshaft supporting (16) of cylinder block crankshaft case, in a upper plenum of main forming part (15) and/or the transmission component of valve mechanism is set in vertical forming part (6).

Images