JPS5865955A - Cylinder block for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder block used in a vehicle such as a small engine of a passenger car.

In the conventional car width, only the cylinder block has strength,
Due to requirements such as rigidity and thermal deformation, most cylinder blocks were made of cast iron despite being heavy, but recently aluminum alloy cylinder blocks are being adopted due to the need for better fuel efficiency and lighter canters. The first method is to harden the surface of the bore part using aluminum, but this is difficult due to cycle time and -t'i
t; This may be a problem in terms of processing capacity.The second method is to install the cylinder liner on the aluminum body using a wet or dry method, but this requires rigidity, so the gap between the cylinders is narrowed. There is a problem that it is not possible to do this, and the third problem is to integrate ψ and j, but
This poses a problem in terms of long-term durability and reliability, such as the occurrence of cracks due to the difference in thermal expansion. The problems common to the above-mentioned first, second, and third types of prior art are that it is necessary to increase the rigidity of the aluminum block so that no difference in expansion occurs regardless of the direction of lightening. As a result, the weight is forced to increase more than necessary, and although this is not the case for light and small engines, the increase in weight for smaller engines also increases the amount of aluminum used, which increases the cost during mass production. This poses the important problem of increasing the

The present invention aims to solve the above-mentioned problems. That is, the present invention separates a conventional cylinder block into an upper high-temperature assembly and a room-temperature assembly in the F section, the lower part is made of a structure that does not require precision and strength and is inexpensive, and the upper part is made of iron-based material. Based on the concept of an integrated structure with a performance equivalent to that of conventional iron-based products,
Hollow cylindrical bodies are arranged in parallel lines in the bore part, circular to square tubular bodies are arranged in the local part, a narrow waterway is provided between them, and this is sandwiched between an upper casing and a lower casing. The present invention provides a cylinder block that is integrated by welding.

Hereinafter, the embodiments shown in the drawings will be described in detail.

FIG. 1 is an exploded perspective view showing a cylinder block for a vehicle according to the invention. A plurality of hollow cylindrical bodies 1 made of iron-based material and having equal lengths are arranged linearly in a plane perpendicular to the axes so that their respective axes are parallel to each other. A cylinder liner 2 (FIG. 2) is press-fitted onto the inner peripheral surface of the hollow cylindrical body 1. A plurality of tubes 3 and 4 made of commonly used iron-based materials are arranged on the outside of a hollow cylinder (main 1) so that their axes are parallel to each other. .4 Length d: Equal to the length of the medium cylindrical body. 3.4i1, It may be a circular tube or a square tube. The hollow cylindrical body 1 and the tubes 6 and 4 are arranged so that they do not move relative to each other. are at least partially solidified, and narrow channel stones are formed between the (71, ?L) -C
There is. This 1M layer method is a method of welding iron pipes,
Sintered materials such as S i 3N41. Methods such as integral molding with high-strength ceramic materials such as SiC or FRM (aluminum mixed with carbon fiber), or integral thin-wall casting with high-strength νJ steel or I') CI. There is. Methods for forming the entire cooling water channel gap 6 include fixing it at a slight distance in advance, welding it by removing the thickness in advance (Fig. 6), and welding it together by welding it later. Alternatively, there is a method of cutting and forming with a laser beam or the like (in the case of a ceramic sintered body). The inner surface of the hollow cylindrical body 1 can be finished by direct grinding, by beam hardening and honing after machining, or by hard chrome plating, in addition to the method of pressure fitting the cylinder liner 2 after machining as described above. A bore sliding surface is formed by a method such as The upper casing is made of 5F steel, and a water passage hole 6 is bored in the upper surface thereof, and a hole into which the hollow cylindrical body 1 and the upper part of the pipes 3 and 4 are fitted is formed. Reference numeral 7 denotes a lower casing made of steel, and a hole is formed in its lower surface into which the hollow cylindrical body 1 and the lower part of the tube 3.4 are fitted. The hollow cylindrical body 1 and the tubes 6 and 4 are connected to the upper casing 5 and the lower casing 7 (
The cylinder block is constructed by sandwiching the L-shaped rods from above and below and welding them together and to the ends of the hollow cylindrical body 1 and the tube 3゜4, respectively, and galvanizing as required (5). -32: Yes. This cylinder block is clamped from above and below by the cylinder head 9 and crankcase 10 through sealing means, and then fastened by tension bolts 11 inserted into the +311 tubes 3 and 4. Sealing means 1-A interposed between the cylinder block and cylinder head 9
1. A gasket 12, and a sealing means interposed between the crankcase 10 and the cylinder block is a packing 15. As the packing 15, calligraphy paper impregnated with heat-resistant epoxy resin can be used.

Instead of the gasket 12, as shown in FIGS. 4 and 8PJ5, a thin metal plate 21 is provided at the periphery of the bore portion of the upper plate where J2j41≦cane/g5, and the thin metal plate 21 and the upper casing 5 are connected. A heat-resistant sealing material 22 can be inserted between the upper surface and the upper surface to perform flanging.

Since the present invention has the above-mentioned construction, the cost is reduced compared to a cylinder block whose entire structure is made of aluminum, and since the high-temperature part is made of iron, the dimensional accuracy is stable and the material is made of different materials. There is no need to worry about the gear knob between (6) and -, and it has high durability and reliability over a long period of time. or,
There is a degree of freedom in selecting other materials, and the structure is simple and easy to form, making it easy to mass produce. Additionally, it allows for much narrower bore-to-cylinder gaps compared to cast irons. father,
Since it can be processed independently, the bore grinding accuracy is high and the cost is low, making it ideal for small-volume production and short-term prototype engines.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the inventive cylinder block. FIG. 2 is a sectional view showing a state in which the cylinder block is sandwiched between the cylinder head and the crankcase and bolted. FIG. 5 is a perspective view showing a state in which the outer surface of the tube for bolt insertion has been processed to form a water channel. Figure 4 is a perspective view of the upper casing, and Figure 5 is a perspective view of the upper casing.
-v sectional view. DESCRIPTION OF SYMBOLS 1...Hollow cylindrical body, 3.4...Pipe, 5...Upper casing, 7...Lower casing, 6...Waterway. Figure 1 Figure Figure 2 Figure 3 323- Figure 4 Figure Figure 5

Claims (1)

[Claims] A plurality of hollow cylindrical bodies made of iron-based material having equal lengths are arranged such that the valley axes of the hollow cylindrical bodies are parallel to each other and 181
]A plurality of tubes made of iron-based material are arranged in a straight line in a plane perpendicular to the axis line, and the plurality of tubes made of iron-based material for passing through tension bolts are outside the hollow cylinder body, and the axis line of the hollow cylinder body is parallel to the loaf. arranged so that the length of the tube is equal to the length of the hollow cylinder, the hollow cylinder and the tube are at least partially fixed so as not to move relative to each other, and
A cylinder block for a vehicle, in which a narrow waterway is formed between them, the hollow cylindrical body and the pipe are sandwiched from above and below by an upper casing and a lower casing, and are integrated by welding.