JPS6224774Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lightweight, high-strength, compact, and highly rigid cylinder block made of steel plate.

Conventionally, in order to reduce the weight of cylinder blocks used in automobile engines, measures have been taken such as forming them from aluminum or steel plates. It is clear that an aluminum cylinder block has excellent cooling performance, is simple in construction, and is lightweight, but if you compare it with a steel plate cylinder block, even though they are similar in terms of light weight, However, it is inferior in terms of manufacturing cost, coefficient of thermal expansion, specific strength, etc. That is, the cylinder block made of steel plate is superior to the cylinder block made of aluminum in the above points, and because of its integral structure, it is by no means inferior to the cylinder block made of aluminum in terms of natural frequency.

The present invention relates to the improvement of a steel plate cylinder block having the excellent properties described above, and its purpose is to improve the structure of the steel plate cylinder block, instead of using a bolted structure of a deep drawn body. By using a welded structure that is easy to mass-produce, we aim to provide a practical cylinder block that is lightweight, strong, compact, and highly rigid, and also has high vibration resistance. be.

The steel plate cylinder block of the present invention which achieves the above object has a required number of cylinder members arranged in a deep drawn hole in a rectangular deep drawn steel plate cylinder block body in external contact with each other. The contact portions of the members are integrated by seam welding, the contact portion between the outer surface of the cylinder member and the inner surface of the deep-drawn hole is integrated by spot welding, and the bottom surface of the cylinder block body is integrated by spot welding. The cylinder member is characterized in that a hole having a diameter equal to the bore diameter is formed by punching at a position corresponding to each bore of the cylinder member.

Hereinafter, embodiments of the present invention will be described based on the drawings.

1, 2, 4, 5, and 6 show a first embodiment of the present invention, in which a cylinder block body 1 is formed by deep drawing a steel plate. A flange 1a for mounting a cylinder head 2 is formed on the upper edge of the cylinder block body 1, and the cylinder head 2 is fixed to the flange 1a with bolts 21 and nuts 4 via a bracket 3. The side walls located on both sides of the deep drawn hole 1b of the cylinder block body 1 have bead portions 1c, 1c.
... are formed, and cylinder members 5, 5, 5, 5 are housed in series in the deep drawn hole 1b. Then, the cylinder members 5, 5 adjacent to each other
As shown in Fig. 4, the contact parts M, M, . (It may be changed to welding.) Also, these cylinder members 5, 5,
5, 5 and the cylinder block body 1 are spot welded at positions N, N, N, . . . away from the bead portion 1c. Note that the passages 7, 7, . . . formed between the bead portion 1c and the cylinder member 5 each function as a communication passage for cooling water. On the other hand, holes 1d, 1d, . The lower end portions of each cylinder liner 8, 8..., which were punched and formed into each cylinder member 5, 5..., are formed by punching and forming, respectively, and are press-fitted into each cylinder member 5, 5...
It stands out from... The relationship between the cylinder member 5 and the cylinder liner 8 is determined by welding the member 5, machining it, press-fitting the liner 8, and shrink-fitting it.
Dry liner configuration or liner 8
It goes without saying that it is also possible to omit this step and apply a surface treatment to the member 5 so that it can function as the inner surface of the cylinder as it is.

Further, as shown in an enlarged view in FIG. 6, a tapered surface 1e is formed at the lower end of each cylinder member 5, and a seal such as an O-ring is provided between this tapered surface 1e and the cylinder block body 1. A member 9 is interposed. It goes without saying that the sealing member 9 is not limited to an O-ring, and any material that can seal the cooling water may be used.

The cylinder block main body 1 is fixed to the upper surface of the skirt portion 10 shown in FIG. 1 by spot welding or the like, and a member 110 is fixed to the side portion 10a of the skirt portion 10 by spot welding or the like. The side portion 10a serves as a reinforcing member by integrally spot welding a cylinder block subassy on the top of the skirt portion and a bearing capacitance on the bottom.
In addition, there are 10 bolt holes for fixing the oil pan at the bottom.
b, 10b... are formed. Reference numeral 11 denotes a bearing cap sub-assembly, which is fixed to the lower end of the cylinder liner 8 by welding or the like and reinforced in order to be firmly fixed to the skirt portion 10a in a press-folded configuration. The bearing cap assembly 11 and the skirt portion 10a are integrated by spot welding or the like. Further, the member 110 and the cylinder block main body 1 are similarly integrally spot welded. It goes without saying that a hole 11a having a diameter equal to the bore diameter is formed in the center of the reinforcing member 11.

Cooling water is stored in the deep-drawn holes 1b of the cylinder block body 1 and outside the cylinder members 5, 5, and can communicate with each other through the passages 7, 7, and so on.

FIG. 3 shows a second embodiment of the present invention, and the difference between this embodiment and the first embodiment is that the weld bead portions 1c', 1c', 1c' of the cylinder block body 1 are made into grooves, The cooling water passages 7', 7', . . . are made larger than those of the first embodiment. The rest of the structure is the same as that of the first embodiment (the O-ring is in the lower position), in Fig. 3, Fig. 1, and Fig. 2.
Components labeled with the same reference numerals as those used in the figures, FIGS. 4, 5, and 6 indicate members having the same names and performing the same functions.

Note that 2 is a cylinder head, which is tightened and fixed to the member 1a, which serves as a reinforcing member and a bracket, with a tightening bolt 21. Further, the cylinder block main body 1 and the member 1a are firmly partially spot welded.
However, these points are not the subject of this invention.

As explained above, in the steel cylinder block of the present invention, a required number of cylinder members are arranged in a deep-drawn hole of a steel plate cylinder block body deep-drawn into a rectangular shape so as to be in contact with each other on the outside,
The contact portions of the cylinder members are integrated by seam welding, and the contact portions between the outer surface of the cylinder member and the inner surface of the deep-drawn hole are integrated by spot welding, and the cylinder block body is further integrated by spot welding. The cylinder block made of a steel plate according to the present invention is characterized in that holes having a diameter equal to the bore diameter are punched at the bottom surface of the cylinder member and at positions corresponding to each bore of the cylinder member. Since the contact parts between the outer surfaces of each cylinder member and the contact parts between the outer surfaces of the cylinder members and the inner surface of the deep-drawn hole in the cylinder block body are integrated by welding, the cylinder block has high rigidity and a high natural frequency. It has excellent anti-vibration characteristics and is small and lightweight. Further, by adopting a welded structure in which the contact portions of each member are integrated by welding, it is possible to provide an inexpensive cylinder block that is excellent in mass production. Furthermore, since the cooling water for cooling the engine can be stored in the deep drawing hole of the cylinder block body and on the outside of the cylinder member, the amount of cooling water stored can be sufficiently large, making it possible to increase the cooling capacity. can. Therefore, according to the present invention, it is possible to provide a cylinder block that is lightweight, high strength, compact, and highly rigid, and also has high vibration resistance characteristics, and is advantageous in terms of cost. The effect is extremely significant.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a cylinder block made of steel plate according to the present invention, Fig. 2 is a longitudinal sectional view of the cylinder portion of the cylinder block shown in Fig. 1, and Fig. 3 is a cylinder according to another embodiment of the present invention. 4 is a plan view showing the seam welding process, FIG. 5 is a perspective view of the skirt portion, and FIG. 6 is an enlarged sectional view of the seal portion. 1... Cylinder block body, 1b... Deep drawn hole, 1c, 1c'... Bead portion, 1d... Hole, 2...
...Cylinder head, 5...Cylinder member, 8...
Cylinder liner, 10...skirt part, M...contact part to be seam welded, N...spot welded part.

Claims (1)

[Scope of utility model registration request] A required number of cylinder members are arranged in a deep-drawn hole in a cylinder block body made of a steel plate deep-drawn into a rectangular shape so as to be in contact with each other on the outside, and the contact portions of the cylinder members are integrated by seam welding. Additionally, a contact portion between the outer surface of the cylinder member and the inner surface of the deep-drawn hole is integrated by spot welding, and furthermore, a contact portion between the outer surface of the cylinder member and the inner surface of the deep-drawn hole is integrated by spot welding, and furthermore, a contact portion between the outer surface of the cylinder member and the inner surface of the deep-drawn hole is integrated, and furthermore, a contact portion is formed on the bottom surface of the cylinder block body at a position corresponding to each bore of the cylinder member. A cylinder block made of a steel plate, characterized in that holes each having a diameter equal to the bore diameter are punched out.