JPH1130152A - Cylinder crank housing provided with bridge and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable manufacturing by pressure die-casting technology, make excellent mechanical strength, and hold elongation caused by heat to the minimum extent. SOLUTION: A cylinder crank housing is provided with a jacket chamber 18 of a cooling medium, for concentrically surrounding cylinder holes 12, 13, the jacket chamber 18 is formed of cylinder pipe walls 14, 15 and a jacket wall 16 of the cooling medium and partially ended on the jacket chamber deck surface. Cast wall surfaces 20, 22 have no cutout as seen from the deck surface, bridges 23, 28 are inserted and attached into the jacket chamber, the cylinder pipe walls 14, 15 and the jacket wall 16 are connected to one another in the limited range, a cooling medium flowing hole through which a cooling catalyst can be freely flow is formed, or the walls are continuously connected to one another, and the jacket chamber is completely ended on the deck surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention comprises one or more cylinder bores and a cooling medium jacket chamber substantially concentrically surrounding the cylinder bores, wherein the cooling medium jacket chamber is a cylinder. It relates to a cylinder crank housing or a cylinder tube formed by a tube wall and a jacket wall of a cooling medium, the jacket chamber partially terminating at least at the deck surface or the cylinder head seat surface. The invention also relates to a method of producing the cylinder crank housing casting.

[0002]

BACKGROUND OF THE INVENTION In internal combustion engines, cylinder crank housings of the type described above are commonly used. The cylinder crank housing forms a deck surface on which the cylinder head rests and consists of crank housing cheeks which receive crank housing bearings. Towards the bottom, the cylinder crank housing is closed by the lower half of the crankcase.

[0003] A cylinder tube of the above type is expected to be used in larger internal combustion engine engines. The cylinder tube, in particular the cylinder tube where the cylinder head is selectively located, is fixed to the crank housing by a tension rod. The cylinder tube and the cylinder head are individually prepared, and a plurality of them are connected to each other.

[0004] If the appropriate material and the appropriate heat treatment are selected, the cylinder bore in the cylinder crank housing or in the casting of the cylinder tube section forms the cylinder liner of the cylinder tube which is directly cooled by the cooling medium. can do. Alternatively, they are in so-called dry contact, which makes surface contact with the cylinder bore and forms a cylinder liner.
Can be adapted to cylinder bush.

[0005] The cylinder bushings can be cast in a casting surrounded by a melt, and they can subsequently be inserted into the finished casting.

The cooling medium jacket chamber functions to dissipate heat from the region of the cylinder bore by the continuously flowing cooling medium. According to a first widely used mode of use, the cylinder head and the cylinder crank housing form a common cooling circuit, wherein the cooling medium inside the common cooling circuit is from the jacket chamber to the deck surface. Through a cooling medium flow hole in the deck surface area. The cylinder head has a cooling medium flow hole corresponding to the cooling medium flow hole at a lower portion thereof. A seal is inserted between the cylinder crank housing and the cylinder head, with a corresponding hole formed in the seal for the coolant flow channel.

[0007] According to a second aspect, the cooling circuits of the cylinder head and the cylinder crank housing are completely independent of each other. The seal without the cooling medium flow hole is the cylinder head and the cylinder crank
Inserted between the housings, terminating the cooling jacket chamber at the deck surface. Thus, the two cooling circuits are separated from each other.

[0008] As the casting of the cylinder / crank housing, those of the so-called open deck type and those of the closed deck type are known. The following description is also applicable to the above-described type of cylinder tube casting. In the case of an open deck type, the cylinder tube wall is completely free with respect to the jacket wall of the cooling medium in the area of the deck surface. (German Offenlegungsschrift 3639691A1) When viewed from the deck surface, the walls defining the cooling medium jacket are preferably notched. This makes it possible to produce castings of this type by die-casting technology. The die or core portion, which can be removed axially in the direction of the cylinder bore, forms a cooling medium jacket chamber.

In the case of the closed deck type, the bridge is
It is inserted between the cylinder tube wall and the cooling medium jacket wall in the deck surface area to reduce the size of the cooling medium flow hole. (MTZ 1993, page 421, FIG. 2 and page 579, FIG. 5) This type provides a member with greater strength and makes it possible to prevent cross-sectional deformation (oval deformation) of the cylinder tube wall. . It also eliminates a substantial difference between, on the one hand, the thermal expansion of the cylinder tube wall and, on the other hand, the thermal expansion of the cooling medium jacket wall. Differences in elongation result in torsion and damage of the seal. Cylinder-crank housings and cylinder tubes having these characteristics can be manufactured using split cores and using suitable casting methods.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a casting of the first mentioned type which can be produced by pressure die casting using permanent dies, which suffers from the typical disadvantages of the open deck type. There is no casting to provide.

[0011]

SUMMARY OF THE INVENTION In a first solution, a cooling medium jacket chamber is formed by a casting wall of a cylinder tube wall and a cooling medium jacket wall, the casting wall being a deck surface (a cylinder head cylinder). Sheet surface)
There is no cut when viewed from. Further, a bridge is inserted into the jacket chamber of the cooling medium, and connects the cylinder tube wall and the jacket wall of the cooling medium to each other in a limited area, leaving a cooling medium circulation hole through which the cooling medium can freely flow. Is to do so.

In a second solution, a cooling medium jacket chamber is formed by a casting wall surface of a cylinder tube wall and a cooling medium jacket wall, and the casting wall surface is viewed from a deck surface (cylinder head sheet surface). When there is, there is no cut. Also, a bridge is inserted into the cooling medium jacket chamber and continuously connects the cylinder tube wall and the cooling medium jacket wall to each other so that the cooling medium jacket chamber terminates completely at the deck surface. Is to do.

Castings of the type according to the invention make it possible to take advantage of all the advantages of the pressure die-casting technology, such as, for example, thinning, the production of products close to the product shape (near-net shape), high-speed casting. . They are the advantage of open deck style. A further advantage is that the oil channels and core holes can be pre-cast.
On the other hand, the advantage of the closed deck type in that the bridge between the subsequently inserted cylinder tube wall and the jacket wall of the cooling medium increases the mechanical strength and keeps the thermal elongation to a minimum, Used for

[0014] The first solution creates conditions for forming a common coolant circulation path between the cylinder head and the cylinder crank housing. The second solution makes it possible to implement a separate coolant circulation for the cylinder head and the cylinder crank housing. In particular, the advantage is that the sealing effect of the cylinder head seal is only required for internal combustion gases, not for the cooling medium. The cooling medium jacket chamber is completely closed except for the inlet and outlet holes, giving the most difficult shape even to implement a casting scheme with a split core.

The casting according to the invention is preferably made of an alloy of aluminum or magnesium and is widely used for engines for internal combustion engines in passenger cars due to its light weight.

According to a first embodiment, the bridge consists of a molded part, which is welded or glued. Rather than welding or gluing, such molded parts can also be inserted by shrink-fitting or wedging. The use of such shaped parts is particularly essential if the thickness of the cooling medium jacket exceeds certain dimensions. In another form, the molding can be mounted on a step on the wall. The steps are formed by casting or machining. For this reason, it is possible to form a wall having a stepped portion which is cut out in a stepwise manner in the radial direction with respect to the cylinder tube axis and which is engaged with the molded member.

According to yet another aspect, the bridge can consist essentially of a welding material. This is preferably used for relatively small radial thickness cooling medium jackets. However, in this case, when the bridge is made, the support member can be inserted or press-fitted first to prevent the welding material from flowing out immediately.

Since the release agent for separating the dies is usually fixed to the casting produced by pressure die casting in a permanent die, at least in some areas prior to forming the bridge by welding or bonding. It is proposed that the release agent be removed first. The present invention includes all modifications that can be made by those skilled in the art without being limited to those described herein.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention are listed below. (1) A cylinder crank housing having a bridge according to claim 1 or 2, wherein the bridge (23,
24) is made of a welded molded member.

(2) A cylinder / crank housing casting having a bridge according to claim 1 or 2,
The bridge (23, 24) consists of a molded part to which it is bonded.

(3) A cylinder / crank housing casting having a bridge according to claim 1 or 2,
The bridge comprises a molded member that is wedged.

(4) A cylinder / crank housing casting having a bridge according to claim 1 or 2,
The bridge comprises a shrink-fit molded member.

(5) In the cylinder / crank housing casting having a bridge according to any one of the above (1) to (4), the formed member (31) is formed of a wall surface (20, 22).
In the step (step).

(6) In the cylinder / crank housing casting having a bridge according to any one of the above (1) to (5), the molded member is formed of a wall (14, 15, 16).
Is locked to the stepped portion cut out in the radial direction.

(7) A cylinder / crank housing casting having a bridge according to claim 1 or 2,
The bridge (25, 26) consists essentially of a welding material.

(8) It has a cylinder tube cast together,
Cylinder / crank having a bridge according to any one of claims 1 or (1) to (6), wherein each two adjacent cylinder bores (12, 13) are delimited by a common cylinder tube wall (17). In the housing casting, the bridges (27, 28) abut the common tube wall (17).

(9) In the method for producing a cylinder / crank housing casting having a bridge according to claim 3 or 4, the casting is produced by pressure die casting.

(10) In the method for manufacturing a cylinder / crank housing casting having a bridge according to the third or fourth aspect, before the bridge is inserted, at least the release agent attached to the casting is attached to the bridge. Removed in the area.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a cylinder tube in the region of a cooling medium jacket chamber of a cylinder / crank housing casting of the present invention, and FIG. 2 is a plan view of a deck surface of the cylinder / crank housing casting of the present invention. .

A cylinder crank housing 11 having a plurality of cylinder bores 12, 13 (two of which are shown in the drawing) substantially comprises a cylinder tube wall 14,
15 and a jacket wall 16 for the cooling medium, the jacket wall 16 constituting the outer wall of the crank housing. The cylinder hole 12 is a cylinder hole at the end. The cylinder tube walls 14 and 15 have a common tube wall 17. The cylinder tube walls 14,15 together with the cooling medium jacket wall 16 form a cooling medium jacket chamber 18 which extends substantially concentrically with the cylinder tube walls 14,15.

As shown in FIG. 1, the jacket chamber 18 is defined by wall surfaces 20, 21 of the cylinder tube walls 14, 15 and a wall surface 22 of the jacket wall 16, and the shape of the wall surfaces 20, 21, 22 is a deck surface. When viewed from 19, there is no cut. In the area of the deck surface 19, bridges 23-28 are arranged to connect the cylinder tube walls 14, 15 and the jacket wall 16.

The bridge 23 is made of a molded member 31. The molding member 31 includes a step portion 30 formed on the wall surfaces 20 and 22,
32, and the steps 30, 32 by the welds 33, 35
Joined to.

Although the bridge 25 can have the same configuration as the bridge 23, in FIG.
5 shows an example in which the entirety is made of the welding material 34. In this embodiment, the bridges 23, 25 and 24, 2
Numerals 6 are arranged perpendicularly to a line connecting the centers of the cylinder pipes and opposed to each other.

The bridges 27, 28 are respectively arranged between the common cylinder tube wall 17 and the jacket wall 16. The cooling medium jacket chamber 18 extends substantially concentrically with respect to the cylinder tube walls 14,15. The radial thickness of the jacket chamber 18 will be adapted to the inflow and outflow conditions and will vary depending on the application.

The bridge is inserted into the jacket chamber (18) so as to continuously connect the cylinder tube walls (14, 15) and the cooling jacket wall (16) to each other as shown in FIGS. It can be done. In this case, the jacket chamber (18) terminates completely at the deck surface (19).

As a specific configuration, steps 30A and 32A are continuously formed on the wall surfaces 20, 21 and 23, and the jacket chamber 18 is formed on the steps 30A and 32A as shown in FIG. An integrated molded member 31A formed in the same shape as viewed from the deck surface 19 is inserted, or a plurality of divided molded members 31A are continuously inserted and welded from the deck surface 19 side. Continuous welds 33A and 35A are formed to form a continuous bridge.

As shown in the left half of FIGS. 3 and 4, the jacket chamber 18 can be welded from the deck surface 19 side to form a continuous bridge by the welding material 34A.

As shown in FIG. 5, the bridges 23 and 25 are formed of a molded member 31B.
It is also possible to adopt a configuration in which it is placed on the steps 30 and 32 formed on the steps 0 and 22 and is joined to the steps 30 and 32 by the adhesive 36.

Although not shown, FIG.
In the same manner as shown in FIG. 7, the bridges 23 and 25 may be formed by forming steps 30 and 32 on the wall surfaces 20 and 22 and shrink-fitting a molding member on the steps 30 and 32.

As shown in FIG. 6, for example, the bridge 2
3, 24, 25, 26 are molded with wedge-shaped sides 38, 39, and the bridges 27, 28 are shaped with wedge-shaped projections 37 to fit these bridges from the deck surface 19. The bridge can also be formed by wedging the wall surfaces 20, 21, 22.

[0041]

According to the present invention, a cylinder / crank / housing casting according to the present invention can be used to manufacture a thinner, near-net-shaped product.
It is possible to utilize all the advantages of pressure die casting technology such as high speed casting, the bridge between the inserted cylinder tube wall and the jacket wall of the cooling medium increases the mechanical strength,
Keep thermal elongation to a minimum.

[Brief description of the drawings]

1 is a sectional view of the cylinder tube in the region of the cooling medium jacket of the cylinder crank housing casting according to the invention, taken along section AA in FIG. Show.

FIG. 2 is a plan view of the deck surface of the cylinder / crank housing casting of the present invention, showing a case where a bridge is intermittently inserted.

FIG. 3 is a sectional view of the cylinder tube in the region of the cooling medium jacket chamber of the cylinder crank housing casting of the present invention, taken along the line BB in FIG. 3, in which a bridge is continuously inserted; Show.

FIG. 4 is a plan view of a deck surface of the cylinder / crank housing casting of the present invention, showing a case where bridges are continuously inserted.

FIG. 5 is a cross-sectional view of the cylinder tube in the region of the coolant jacket chamber of the cylinder crank housing casting of the present invention, showing the bridge inserted by gluing.

FIG. 6 is a plan view of a deck surface of the cylinder / crank / housing casting of the present invention, showing a case where a bridge is inserted with a wedge.

[Explanation of symbols]

 11 Cylinder Crank Housing 12 Cylinder Pipe 13 Cylinder Pipe 14 Cylinder Pipe Wall 15 Cylinder Pipe Wall 16 Jacket Wall (Crank Housing Wall) 17 Common Pipe Wall 18 Jacket Chamber 19 Deck Surface 20 Wall 21 Wall 22 Wall 23 Bridge 24 Bridge 25 Bridge 26 Bridge 27 Bridge 28 Bridge 30 Step 30A Step 31 Forming member 31A Forming member 32 Step 32A Step 33 Weld 33A Weld 34 Weld material 34A Weld material 35 Weld 35A Weld 36 Adhesive 37 Wedge Shape projection 38 Wedge shaped side 39 Wedge shaped side

Claims (4)

[Claims] 1. One or more cylinder bores (12, 1).
3) and a cooling medium jacket chamber (1) substantially concentrically surrounding the cylinder bores (12, 13).
8), wherein the jacket chamber (18) is formed by the cylinder tube walls (14, 15) and the jacket wall (16) of the cooling medium, and the jacket chamber (1) is formed.
8) is a cylinder crank housing at least partially terminating at a deck surface (19), wherein the jacket chamber (18) comprises a cylinder tube wall (14, 1).
5) and the casting wall (20, 2) of the jacket wall (16).
2), the casting wall surfaces (20, 22) have no cut when viewed from the deck surface (19), and the bridge (2)
3 to 28) are inserted into the jacket chamber (18), and the cylinder tube walls (14, 15) and the jacket wall (1).
6) are connected to each other in a limited area to form a cooling medium flow hole through which the cooling medium can flow freely.
housing. 2. One or more cylinder bores (12, 1).
3) and a cooling medium jacket chamber (1) substantially concentrically surrounding the cylinder bores (12, 13).
8), wherein the jacket chamber (18) is formed by the cylinder tube walls (14, 15) and the cooling medium jacket wall (16), and the jacket chamber (1) is formed.
8) is a cylinder crank housing at least partially terminating at a deck surface (19), wherein the jacket chamber (18) comprises a cylinder tube wall (14, 1).
5) and the casting wall (20, 2) of the jacket wall (16).
2), the casting wall surfaces (20, 22) have no cut when viewed from the deck surface (19), and the bridge (2)
3 to 28) are inserted into the jacket chamber (18), and the cylinder tube walls (14, 15) and the cooling jacket wall (16) are continuously connected to each other to form the jacket tube.
A cylinder crank housing having a bridge, characterized in that the chamber (18) terminates completely at the deck surface (19). 3. One or more cylinder bores (12, 1).
3) and a cooling medium jacket chamber (1) substantially concentrically surrounding the cylinder bores (12, 13).
8), wherein the jacket chamber (18) is formed by the cylinder tube walls (14, 15) and the cooling medium jacket wall (16), and the jacket chamber (1) is formed.
8) A method of manufacturing a cylinder crank housing which terminates at least partially in a deck surface (19), wherein the jacket chamber (18) comprises a cylinder wall (14, 15) and a jacket wall (16). ), And the wall surfaces (20, 22).
Are cast without a cut when viewed from the deck surface (19), and then bridges (23-28) connect the cylinder tube walls (14, 15) and the jacket wall (16) to each other in a limited area. A method for manufacturing a cylinder / crank housing having a bridge, wherein the cylinder / crank housing is inserted so as to form a cooling medium flow hole. 4. One or more cylinder bores (12, 1).
3) and a cooling medium jacket chamber (1) substantially concentrically surrounding the cylinder bores (12, 13).
8), wherein the jacket chamber (18) is formed by the cylinder tube walls (14, 15) and the cooling medium jacket wall (16), and the jacket chamber (1) is formed.
8) A method of manufacturing a cylinder crank housing which terminates at least partially in a deck surface (19), wherein the jacket chamber (18) comprises a cylinder wall (14, 15) and a jacket wall (16). ), And the wall surfaces (20, 22).
Are cast such that there is no cut when viewed from the deck surface (19), then bridges (23-28) continuously connect the cylinder tube walls (14, 15) and the jacket wall (16) to each other, A method of manufacturing a cylinder / crank housing having a bridge, wherein the jacket chamber (18) is inserted so as to completely terminate at a deck surface (19).