KR19980081095A - Cylinder crank housing with welded bridge - Google Patents

Abstract

In the form of a cylinder crank housing 11 or cylinder tube part and having one or several cylinder holes 12, 13 and a coolant jacket chamber 18, the coolant jacket chamber substantially concentrically surrounding the cylinder holes 12, 13 and The casting formed by the cylinder tube walls 14, 15 and the coolant jacket wall 16 and at least partially closed at the deck face 19 (cylinder head seat face), the coolant jacket chamber is the cylinder tube wall and the coolant jacket wall. Formed by a cast wall surface of the wall surface, which is shaped as an undercut, as shown on the deck surface, the bridge elements are introduced into the coolant jacket chamber to interconnect the cylinder tube wall and the coolant jacket wall in limited areas and free coolant. Leave the transfer holes or connect the cylinder tube wall and the coolant jacket chamber to each other continuously and the coolant jacket chamber on the deck side. It is configured so as to close still.

Description

Cylinder crank housing with welded bridge

The present invention is in the form of a cylinder crank housing or cylinder tube part, has one or several cylinder holes, concentrically surrounds the cylinder hole and is formed by the cylinder tube wall and the coolant jacket wall and at the deck side (cylinder head seat side). A casting at least partially closed. The invention also relates to a process for producing such castings.

In today's internal combustion engines, cylinder crank housings of the type described above are commonly used. The cylinder crank housing forms a deck face, a cylinder head is disposed on the deck face, and the cylinder crank housing includes a crank housing cheek for receiving crank housing bearings. The cylinder crank housing is closed by an oil pan toward its lower end.

Cylinder tube parts of the type described above will be more suitable for use in larger internal combustion engines. The cylinder tube parts are fixedly attached to the crank housing by the tension rod together with the mounting cylinder head. Cylinder tube parts and cylinder heads may be provided in the form of individual elements, or several may be interconnected.

Once a suitable material and appropriate surface treatment are selected, the cylinder holes of the castings can directly form the cylinder liners of the cylinder tube cooled by the coolant, or so-called dry cylinder bushes in surface contact with the cylinder holes. And can form cylinder liners.

The cylinder bushes can be cast into a casting (enclosed by a melt), or then inserted into the final casting.

The coolant jacket chambers serve to dissipate heat from the region of the cylinder bore by the continuously flowing coolant, although the manner in which the coolant is delivered is not described in detail. According to the first widely used embodiment, the cylinder head and the cylinder crank housing form a common cooling circuit, and the coolant inside the common cooling circuit is mounted from the coolant jacket chamber through the coolant transfer holes in the area of the deck face. Flowing into the head, the cylinder head includes a corresponding coolant delivery hole at its lower side. Between the two parts, a seal is inserted which includes the corresponding holes of the coolant delivery channels. According to a second embodiment, which is more commonly used, the coolant circuits of the cylinder head and the cylinder crank housing are constructed completely independent of each other. In a later embodiment, the seal can close the coolant jacket chambers on the deck side without the coolant delivery holes inserted between the two parts, thereby separating the two coolant circuits from each other.

Castings in the form of cylinder crank housings are known as so-called open-deck design and closed-deck design. The descriptions provided below may similarly apply to castings in the form of cylinder tube parts of the type described above. In the case of an open-deck design, the cylinder tube walls are completely free standing upright against the coolant jacket walls in the area of the deck face (see for example DE 36 39 691 A1). The walls delimiting the coolant jacket are preferably free of undercuts as shown from the deck face. This allows castings of this type to be produced by pressurized die casting techniques of permanent casting dies (metal molds). The die part or core part, which can be removed axially in the direction of the cylinder holes, forms the coolant jacket chamber. In the case of a closed-deck design, bridges are provided between the cylinder tube wall and the coolant jacket wall in the area of the deck face, which bridges reduce the size of the coolant transfer hole (eg, see FIG. 421 of page 421 of MTZ 1993). 2 and FIG. 5 on page 579). This design provides greater strength to the component. This design makes it possible to prevent cross-sectional deformation of the cylinder tube walls (ellipsification), and also to avoid a substantial difference between the thermal elongation of the cylinder tube wall on one side and the coolant jacket wall on the other side; Such a difference can lead to distortion or damage to the seal. Cylinder crank housings and cylinder tube parts having this characteristic can only be manufactured using separate cores and suitable casting methods.

It is therefore an object of the present invention to provide a casting of the type described above which can be produced by pressurized die casting in a permanent die without incurring the typical drawbacks of an open-deck design.

1 is a vertical sectional view showing a cylinder tube of a casting according to the invention in the region of the coolant jacket chamber according to the dividing line of FIG.

Figure 2 is a plan view of the deck face of the casting according to Figure 1;

Figures 3 (a) and (b) are vertical cross-sectional views showing a cylinder tube of a casting according to the invention in the region of the coolant jacket chamber according to the dividing line 3-3 of Figure 4, where (a) is continuous from the shape Sectional view with bridge elements, (b) Sectional view with continuous bridge elements from welding material.

4 (a) and (b) are plan views of the deck face of the casting according to FIG. 3, (a) is a cross sectional view with a continuous bridge element from the shape, and (b) a continuous bridge element from the welding material; Sectional view provided.

FIG. 5 is a vertical sectional view showing a cylinder tube of a casting having bridge elements shown and bonded according to the invention in the region of the coolant jacket chamber in accordance with parting line 5-5 of FIG.

Figure 6 is a plan view of the deck face of the casting according to Figure 5;

FIG. 7 is shown in accordance with the invention in the region of the coolant jacket chamber in accordance with the dividing line 7-7 of FIG. 8, showing vertically showing a cylinder tube of the casting in which the support elements radially engage the undercut recesses in the wall. Cross-section.

8 is a plan view of the deck face of the casting according to FIG. 7;

Explanation of symbols for the main parts of the drawings

11: crank housing

12, 13: cylinder tube

14, 15: cylinder tube wall

16: crank housing wall

17: common tube wall

18: coolant jacket chamber

19: deck face

23 to 28: bridge elements

31: shape

According to the first solution of the present invention, the coolant jacket chamber is formed by the casting wall face of the cylinder tube wall and the coolant jacket wall and the wall face is shaped without an undercut as shown in the deck face (cylinder head seat face), The bridge elements are configured to be introduced into the coolant jacket chamber to interconnect the cylinder tube wall and the coolant jacket wall in limited areas and through the coolant delivery holes.

According to a second solution of the invention, the coolant jacket chamber is formed by the casting wall face of the cylinder tube wall and the coolant jacket wall and the wall face is shaped without an undercut as shown in the deck face (cylinder head seat face), The bridge elements are introduced into the coolant jacket chamber and are configured to continuously connect the cylinder tube wall and the coolant jacket chamber to each other and to close the coolant jacket chamber completely on the deck side.

The casting type according to the present invention makes full use of the advantages of press die casting techniques such as thin wall, close net shape and high casting speed which are the advantages of open-deck design. Another advantage is the ability to precast oil channels and core holes. On the other hand, the advantages of the closed-deck design are also fully exploited, in that the series of bridges produced between the cylinder tube wall and the coolant jacket wall have increased mechanical strength and maintain minimal thermal elongation.

The first solution creates a state that achieves a common cooling circuit of the cylinder head and the cylinder crank housing. The second solution makes it possible to effectively carry out separate cooling circuits for the cylinder head and the cylinder crank housing. As a particularly advantageous advantage, the sealing effect of the cylinder head seal is only required for the combustion gases, not for the coolant. The completely closed coolant jacket chambers, with the exception of the inlet and outlet holes, provide a shape that can be attained at the highest difficulty by common casting methods using separation cores.

Preferably the castings according to the invention are made of aluminum or magnesium alloys which, due to their weight, are increasingly being used as internal combustion engines in passenger vehicles.

According to the first embodiment, it is proposed that the bridge elements consist of welded and bonded features. After being welded and bonded, the features inserted in this manner may be contracted or wedged. In particular, the use of such features is inevitable when the thickness of the coolant jacket exceeds certain dimensions. In another embodiment of this variant, the features may be located on a step in the wall faces, which step are manufactured or cast by machining. For this purpose, recesses which are radially undercut about the cylinder tube axes and engage the shape can be provided in the wall parts.

According to another embodiment of the invention, the bridge elements may consist essentially of a welding material. This is preferably used to make coolant jackets of relatively small radius thickness. In this case, however, it is possible to insert or press the support element to prevent the welding material from immediately flowing and leaving the bridge element to be manufactured.

Since the die releasing agent is generally attached to the castings made by pressure die casting in permanent dies, it is proposed to first remove the castings in at least a certain area before producing the bridge elements by welding or gluing. Those skilled in the art will readily appreciate that modifications can be made from the full text of the description.

Mention is also made of methods of making castings of this type. Accordingly, reference is made to the content of each claim.

Preferred embodiments of the present invention will be described below with reference to the drawings.

Hereinafter, the drawings will be described.

1 and 2, the cylinder crank housing 11 has a plurality of cylinder holes 12, 13 shown in two and generally comprises a cylinder tube wall 14, 15 constituting the outer crank housing wall 16. ) And the coolant jacket wall 16. The cylinder hole 12 is in one end position. The cylinder tube walls 14, 15 have a common tube wall 17. The cylindrical tube walls 14, 15 together with the coolant jacket wall 16 form a coolant jacket chamber 18, which extends concentrically with respect to the cylinder tube walls 14, 15. As shown in FIG. 1, the coolant jacket chamber 18 is limited by walls 20 of the cylinder tube walls 14, 15 and walls 22 of the coolant jacket wall 16, and such walls. The configuration of (20, 22) is such that there is no undercut as shown from the deck surface 19. As shown in FIG. In the area of the deck face 19, bridge elements 23-28 are provided which connect the cylinder tube walls 14, 15 to the coolant jacket wall 16. The bridge element 23, shown in cross section, consists of a shape 31, which is arranged on the steps 30, 32 in the walls 20, 22 and connected by welds 33, 35. have. The bridge element 25, shown in cross section, consists of welding material only. For example, the bridge elements 23, 25 and 24, 26 are arranged opposite each other on the cross section line and perpendicular to the connection line in the center of the cylinder tube. Bridge elements 27, 28 are arranged between the common cylinder tube wall 17 and the coolant jacket wall 16, respectively. The coolant jacket chamber 18 extends concentrically with respect to the cylinder tube walls 14, 15, but the thickness is different relative to its outer circumference to match the inflow and outflow conditions of the coolant.

3 (a) and (b) and 4 (a) and (b), the cylinder crank housing 11 is provided with a plurality of cylinder holes 12 and 13 shown in two. Cylinder holes are defined by the cylinder tube walls 14, 15. The coolant jacket wall 16 surrounds the cylinder tube walls 14, 15. In general, the coolant jacket wall 16 constitutes an outer crank housing wall. The cylinder tube walls 14, 15 have a common tube wall 17. The cylinder tube walls 14, 15 together with the coolant jacket wall 16 define the coolant jacket chamber 18. The coolant jacket chamber 18 extends concentrically with respect to the cylinder tube walls 14, 15.

As shown in FIGS. 3A and 3B, the coolant jacket chamber 18 is formed by the wall face 20 of the cylinder tube walls 14, 15 and by the wall face of the coolant jacket wall 16. 22) the boundary is formed. The construction of the wall surfaces 20, 22 is a shape without undercuts as shown from the deck surface 19 as shown in FIGS. 3A and 3B.

Continuous bridge elements 23 '(FIGS. 3A and 4A) and 25' (FIGS. 3B and 4B) are within the area of deck face 19. Is provided. Bridge elements 23 ′, 25 ′ connect the cylinder tube walls 14, 15 to the coolant jacket wall 16. As shown in cross section, the bridge element 23 ′ has a feature 31 ′ disposed on the step portions 30 ′, 32 ′ in the walls 20, 22. The feature 31 ′ is connected to the walls by welds 33 ′, 35 ′. As shown in the cross-sectional view of Fig. 3B, the bridge element 25 'is made entirely of a welding material. Bridge elements 23 ', 25' close the coolant jacket chamber 18 substantially completely at the deck end with a single smaller gap or opening that is likely to open. The coolant jacket chamber 18 extends substantially concentrically with respect to the cylinder tube walls 14, 15.

5 and 6, the cylinder crank housing 11 has a plurality of cylinder holes 12, 13 shown in two. Cylinder holes are defined by the cylinder tube walls 14, 15. The coolant jacket wall 16 surrounds the cylinder tube walls 14, 15. In general, the coolant jacket wall 16 constitutes an outer crank housing wall. The cylinder tube walls 14, 15 have a common tube wall 17. The cylinder tube walls 14, 15 together with the coolant jacket wall 16 define the coolant jacket chamber 18. The coolant jacket chamber 18 extends concentrically with respect to the cylinder tube walls 14, 15.

As shown in FIG. 5, the coolant jacket chamber 18 is bounded by the wall face 20 of the cylinder tube walls 14, 15 and by the wall face 22 of the coolant jacket wall 16. have. The configuration of the wall faces 20, 22 is a shape without undercuts as shown from the deck face 19 as shown in FIG. 5.

Bridge elements 23 to 28 are provided in the area of the deck face 19. Bridge elements 23-28 connect cylinder tube walls 14, 15 to coolant jacket wall 16. As shown in cross section, the bridge element 23 starts from a feature disposed on the step portions 30, 32 in the wall faces 20, 22. The feature is connected to the walls by layers 43, 45 of adhesive. As shown in the cross-sectional view of FIG. 1, the bridge element 25 from the feature is fixed by adhesive layers 47, 49, and the bridge elements 23, 25 and 24, 26 are connected to the center of the cylinder tube. Mutually arranged on a cross-section perpendicular to the cross-section, each of the bridge elements 27, 28 is arranged between the common cylinder tube wall 17 and the coolant jacket wall 16 and further comprises an adhesive layer 43, 45, 47,. 49). The coolant jacket chamber 18 extends substantially concentrically with respect to the cylinder tube walls 14, 15. In order to match the radial thickness of the chamber to the inlet and outlet conditions, the thickness is varied along the outer periphery. Also holes 36 to 42 are formed between the bridges at the inlet and outlet.

7 and 8, the cylinder crank housing 11 has a plurality of cylinder holes 12, 13 shown in two. Cylinder holes are defined by the cylinder tube walls 14, 15. The coolant jacket wall 16 surrounds the cylinder tube walls 14, 15. In general, the coolant jacket wall 16 constitutes an outer crank housing wall. The cylinder tube walls 14, 15 have a common tube wall 17. The cylinder tube walls 14, 15 together with the coolant jacket wall 16 define the coolant jacket chamber 18. The coolant jacket chamber 18 extends concentrically with respect to the cylinder tube walls 14, 15.

As shown in FIG. 7, the coolant jacket chamber 18 is bounded by the wall face 20 of the cylinder tube walls 14, 15 and by the wall face 22 of the coolant jacket wall 16. have. The configuration of the wall faces 20, 22 is a shape without undercuts as shown from the deck face 19 as shown in FIG. 5.

Bridge elements 23 '' '-28' '' are provided in the area of the deck face 19. Bridge elements 23 '' '-28' '' connect the cylinder tube walls 14, 15 to the coolant jacket wall 16. The bridge element 23 '' 'shown in cross section in Figure 7 starts from a feature disposed on the stepped portions 30' '', 32 '' 'in the wall surfaces 20, 22. The bridge element 23 '' 'is connected to the walls by engaging the radial undercut recesses 53, 55 in the walls. The bridge element 25 ′ ″ shown in FIG. 7 also starts from the shape and is disposed on the step portions 34 ′ ″ and 36 ′ ″ in the wall faces 20, 22. The bridge element 25 '' 'is connected to the walls by engaging the radial undercut recesses 57, 59 in the walls. The bridge elements 23 '' ', 25' '' and 24 '' ', 26' '' are arranged opposite each other on the cross section perpendicular to the connection line of the cylinder tube center, and the bridge elements 27 '' ', 28 '' 'Each is arranged between the common cylinder tube wall 17 and the coolant jacket wall 16, and with radial undercut recesses 53, 55, 54, 59, 61, 63, 65, 67; Connected by engaging, the radial undercut recesses are in the form of a dovetail that can be welded or retracted into the recess as an example. The coolant jacket chamber 18 extends substantially concentrically with respect to the cylinder tube walls 14, 15. In order to match the radial thickness of the chamber to the inlet and outlet conditions, the thickness is varied along the outer periphery. Also holes 36 to 42 are formed between the bridges at the inlet and outlet.

Although the invention has been described in terms of the preferred embodiment described above, modifications, variations and variations can be made without departing from the scope of the appended claims of the invention.

As described above, the casting type according to the present invention makes full use of the advantages of press die casting techniques such as thin wall, close net shape and high casting speed, which are the advantages of open-deck design. Another advantage is the ability to precast oil channels and core holes. On the other hand, the advantages of the closed-deck design are also fully exploited, in that the series of bridges produced between the cylinder tube wall and the coolant jacket wall have increased mechanical strength and maintain minimal thermal elongation.

The first solution creates a state that achieves a common cooling circuit of the cylinder housing and the cylinder crank housing. The second solution makes it possible to effectively carry out separate cooling circuits for the cylinder head and the cylinder crank housing. As a particularly advantageous advantage, the sealing effect of the cylinder head seal is only required for the combustion gases, not for the coolant. The fully closed coolant jacket chambers, with the exception of the inlet and outlet holes, provide a shape in which common casting methods using separation cores can be obtained with the most difficulty.

Claims (23)

In the form of a cylinder crank housing 11 or cylinder tube part, having one or several cylinder holes 12, 13 and a coolant jacket chamber 18, the coolant jacket chamber being substantially concentric with the cylinder holes 12, 13. In a casting enclosed by a cylinder tube wall (14, 15) and a coolant jacket wall (16) and at least partially closed at the deck surface (cylinder head seat surface), The coolant jacket chamber 18 is formed by the cylinder wall walls 14, 15 and the cast wall faces 20, 22 of the coolant jacket wall 16, the wall faces 20, 22 being deck faces 19. As shown in (cylinder head seat surface), there is no undercut shape, Bridge elements 23-28 are introduced into the coolant jacket chamber 18 to interconnect the cylinder tube walls 14, 15 and the coolant jacket wall 16 and through the coolant delivery holes 26-42 in restricted areas. Casting characterized in that it was possible. In the form of a cylinder crank housing 11 or cylinder tube part, having one or several cylinder holes 12, 13 and a coolant jacket chamber 18, the coolant jacket chamber being substantially concentric with the cylinder holes 12, 13. In a casting enclosed by a cylinder tube wall (14, 15) and a coolant jacket wall (16) and at least partially closed at the deck surface (cylinder head seat surface), The coolant jacket chamber 18 is formed by the cylinder wall walls 14, 15 and the cast wall faces 20, 22 of the coolant jacket wall 16, the wall faces 20, 22 being deck faces 19. As shown in (cylinder head seat surface), there is no undercut shape, Bridge elements 23 to 28 are introduced into the coolant jacket chamber 18, connecting the cylinder tube walls 14, 15 and the coolant jacket chamber 16 to one another in succession and the coolant jacket chamber 18 to the deck face 19. Castings which are fully closed). Casting according to claim 1, characterized in that the bridge elements (23, 24) consist of internally welded features. The casting as claimed in claim 2, wherein the bridge elements (23, 24) consist of internally welded features. The casting of claim 1 wherein the bridge elements are comprised of internally bonded features. The casting of claim 2 wherein the bridge elements are comprised of internally bonded features. The casting of claim 1 wherein the bridge elements consist of an inner wedge shaped feature. 3. The casting of claim 2 wherein the bridge elements consist of an inner wedge shaped feature. The casting of claim 1 wherein the bridge elements are comprised of internally shrinkable features. 3. The casting of claim 2 wherein the bridge elements are comprised of internally shrinkable features. The casting of claim 1 wherein the bridge elements consist of inserted features. The casting of claim 2 wherein the bridge elements consist of inserted features. The casting as claimed in claim 3, wherein the features (31) are arranged on the step (30, 32) in the wall surface (20, 22). The casting as claimed in claim 3, wherein the features engage with radially undercut recesses in the walls (14, 15, 16). Casting according to claim 1, characterized in that the bridge elements (25, 26) consist essentially of a welding material. Casting according to claim 2, characterized in that the bridge elements (25, 26) consist essentially of a welding material. The method according to any one of claims 1 or 3 to 12, In a casting that is cast together and each two adjacent cylinder holes 12, 13 are delimited by a common cylinder tube wall 17, with cylinder tubes, Casting characterized in that the bridge elements (27, 28) are attached to the common tube wall (17) at both ends. It is in the form of a cylinder crank housing 11 or cylinder tube part, has one or several cylinder holes 12, 13, concentrically surrounds the cylinder holes 12, 13, and the cylinder tube walls 14, 15 and the coolant. In a method of making a casting formed by a jacket wall 16 and at least partially closed at deck face 19 (cylinder head seat face), The coolant jacket chamber 18 is cast to form the wall surfaces 20, 22 of the cylinder tube walls 14, 15 and the coolant jacket wall 16, wherein the wall faces 20, 22 are deck faces 19. As shown in (cylinder head seat surface), there is no undercut shape, Then, inserted bridge elements are provided which allow the cylinder tube wall 14, 15 and the coolant jacket wall 16 to interconnect in limited areas and to pass through the coolant delivery holes 36 to 42. How to. It is in the form of a cylinder crank housing 11 or cylinder tube part, has one or several cylinder holes 12, 13, concentrically surrounds the cylinder holes 12, 13, and the cylinder tube walls 14, 15 and the coolant. In a method of making a casting formed by a jacket wall 16 and at least partially closed at deck face 19 (cylinder head seat face), The coolant jacket chamber 18 is cast to form the wall surfaces 20, 22 of the cylinder tube walls 14, 15 and the coolant jacket wall 16, wherein the wall faces 20, 22 are deck faces 19. As shown in (cylinder head seat surface), there is no undercut shape, Then, inserted bridge elements are provided which continuously interconnect the cylinder tube walls 14, 15 and the coolant jacket wall 16 and completely close the coolant jacket chamber 18 at the deck face 19. How to. The method of claim 18, Wherein the casting is produced by pressure die casting. The method of claim 19, Wherein the casting is produced by pressure die casting. The method of claim 18, Before the bridge parts are inserted, the die release agent attached to the casting is removed at least in the area of the bridge parts. The method of claim 19, Before the bridge parts are inserted, the die release agent attached to the casting is removed at least in the area of the bridge parts.