JPS59552A - Engine for automobile - Google Patents

Abstract

PURPOSE:To facilitate the casting of a cylinder block body, to make the weight of an engine light, and to lower the level of noises, by making a water jacket outer wall section and a skirt section of a synthetic resin or the like independent of a cylinder block body. CONSTITUTION:A side cover 12 comprises an upper half, that is, the water jacket outer wall section 19 and a lower half, that is, the skirt section 20 that are integrated and are made of a high damping material such as synthetic resin, organic fiber composite materials, etc. The side cover 12 is joined to and supported by a cover attaching surface 18 of the cylinder block body 11 by means of bonding, hot welding, bolts through a gasket therebetween, or the like, so that a water jacket 21 is defined between an upper deck section 15 and a lower deck section 16. Thus, the casting of the cylinder block body can be facilitated, the engine is made lightweight, and the noises can be reduced.

Description

[Detailed description of the invention] This invention relates to an improvement in the structure of an automobile engine.

As shown in Fig. 1, a conventional automobile engine has a cylinder block as its main basic structure, and the cylinder block has a plurality of cylinder parts J arranged in a row above the lower deck part, for example. At the same time, an outer water jacket 4g is provided to surround the cylinder part Jt, and a skirt part 3 is extended on both sides of the lower deck part 2, which are integrally cast. A plurality of bearing caps 7 are attached to a plurality of bulkhead portions formed in the skirt portion j using cap bolts r, respectively, and rotatably support the crankshaft.
In addition, IO is oil no kun.

However, in the conventional configuration in which the cylinder block is integrally cast as described above, the shape of the core such as the water jacket core becomes complicated during casting, resulting in poor productivity. In the case of mold casting, the design of the mold is difficult and the cost increases0.In addition, the water jacket outer wall portion and skirt portion 3 do not contribute much to the dynamic rigidity of the cylinder block/the entire cylinder block. Therefore, in order to reduce the weight of the engine, it is desirable to make the wall thickness as thin as possible, but in the case of the integrally cast structure as described above, it is actually necessary to reduce the wall thickness to 8 to 4 wn or less due to casting technology. It is difficult to form such a structure, and there is a problem in that this thinning increases the noise radiated from the water jacket outer wall l and the skirt part j.

This invention was made in view of the above points, and by forming the water jacket outer wall part and skirt part separately from the cylinder block main body from a high damping material such as synthetic resin, the cylinder block main body The purpose is to make the casting of the engine easier, as well as to reduce the weight and noise of the engine.

That is, the automobile engine according to the present invention has an upper deck portion and a lower deck portion projecting laterally at the upper and lower ends of a plurality of cylinder portions arranged in series, and a plurality of bulkhead portions below the lower deck portion. and a cylinder block body having cover mounting surfaces along the same plane formed on both sides of the upper deck part, lower deck part, and bulkhead part so as to cover both sides of the cylinder block body. a side cup made of a cylindrical damping material that is joined and supported by the cover mounting surface and forms a skirt portion of the upper half of the crank chamber and defines a water jacket between the hot deck portion and the lower deck portion; The cylinder block main body is provided with a main bearing member formed by integrally connecting a plurality of bearing cap portions in the longitudinal direction to which the cylinder block body is connected with the cylinder head fiK bolts.

Hereinafter, a specific embodiment of the present invention will be described in detail based on the drawings.

2.8 are cross-sectional views of the automobile engine according to the present invention, in which FIG. 2 shows a cross-section in the middle of adjacent cylinder bores, and FIG. 8 shows a cross-section along the center of the cylinder bores. , /l is a cylinder block body integrally cast from h1 alloy or cast iron, /ko is a side cover made of a high damping material, and /3 is a cylinder block body made of A2 alloy etc. like the above cylinder block /l. The cylinder block main body/l, which is a cast main bearing member, has a plurality of cylinder parts tlAf arranged in series, which are connected to each other, and
At the upper and lower ends thereof, there are provided a relatively thick horn (deck part L!; and a lower deck part/6) which protrude laterally, respectively. A head portion 17 is integrally formed, and the upper deck portion /j.

As shown in FIG. 4, cover mounting surfaces /8 are formed on both sides of the lower deck part /l and the bulkhead part 17 along the same plane. In the illustrated example, the left and right cover mounting surfaces itr are parallel, but they may be formed in a slightly tapered trapezoidal shape as shown in FIG. 2.8.

On the other hand, the above-mentioned side cover saw is made by integrating the water jacket outer wall part 19 in the upper half and the skirt part J in the lower half, and is made of synthetic resin such as polypropylene, polyester, nylon 6, or organic resin.

It is made of a high damping material such as a composite material made by blending inorganic fibers with a synthetic resin and its crosslinking agent and molding the mixture under heat and pressure. This side cover 72 is attached using adhesive, heat fusion, or gasket).
It is connected and supported to the cover mounting surface /8 of the cylinder block body /l by means such as bolting through the cylinder block body /l, so that a water jacket 27 is defined between the upper deck part /3 and the lower deck part /l. It has become. In addition, the skirt portion J of the side cover 72 bulges outward along the envelope of the crankshaft (crank shirt) 211, similar to the conventional skirt portion 211, and constitutes the outer shell of the upper half of the crank chamber n. At the bottom end,
The tip end of the leg provided at a position corresponding to the bulkhead part /7 is joined to the cover attachment surface /I of the bulkhead part /7. Incidentally, the water jacket outer wall portion iq is partially provided with a bulge portion /f a f in order to increase rigidity.

The main bearing member 13 includes a plurality of bearing cap parts fixed to the bulkhead part/7 of the cylinder block main body/l with cap bolts jK, respectively, and these bearing cap parts t on both sides of the lower end thereof in the front-rear direction. The cylinder is composed of a pair of connected beam part cores, and a side wall part 21 that connects the skirt part 20 and the beam part 27 to form a part of the outer shell of the crank chamber n. Between the block body // and the crankshaft
J? It has a bearing. There is no particular need to connect the side wall portion 2g and the lower end of the skirt portion 20 of the side cover saw with bolts, and it is sufficient to seal them with silicone sealant or the like. The secondary oil bar 9 is fixed to the lower end of the side wall part 3, that is, to the lower surface of the beam part 27, with bolts 30. Note 1. ? /, ,? 1A and 1B respectively indicate the engine mount l seat formed on the cylinder block body l/machined main bearing member 13.

According to the above configuration, the cylinder block main body// has a shape with both sides open, which is different from the conventional cylinder block body, so that it is easy to design a mold in casting, particularly in die casting. Furthermore, since the water jacket outer wall part 9 and the skirt part 20f, which are the main sources of engine radiated noise, are made of high damping material, the generated noise is reduced and the weight of the engine as a whole can be reduced. The rigidity of the entire engine against bending and torsion is determined by the relatively thick upper deck portion/3. The lower deck part/6 and the skirt part 20 can be sufficiently secured by the main bearing member 13 integrated in the longitudinal direction on both left and right sides of the lower end thereof, and the upper deck part/3. Lower deck part 1
Since the side cover 2 is supported by the side cover 6, the vibration generated in the side cover 2 is suppressed to a lower level.

In addition, as a result of forming the cover additional surface /g of the cylinder block main body L/ along the same plane as described above, machining of the additional surface /S becomes extremely easy, and its surface accuracy is improved. It becomes possible to secure it. Therefore, extremely good watertightness and oiltightness can be obtained with the side cover 72 attached here.1. Furthermore, even when a gasket is interposed between the two, the shape of the cutting kerato can be made relatively simple.

Next, in the embodiment shown in FIG. 5, as the main bearing member /3',
This is an example in which a bearing beam type structure is used in which each bearing cap part is connected to the beam part at 27 and 27. In this case, the oil panco 2 should be
It is fixed to the lower surface of the skirt portion 20 of No. 2 with bolts 30.

As is clear from the above description, in the automobile engine according to the present invention, the water jacket outer wall and skirt, which are the main sources of engine noise, are used as side covers made of high damping material to connect to the cylinder block body. Since they are formed separately, engine noise can be significantly reduced, the casting properties of the cylinder block body can be improved, and at the same time, the overall weight of the engine can be reduced.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional automobile engine, FIGS. 2 and 8 are cross-sectional views of an embodiment of the present invention at different cross sections, and FIG. 4 is a cylinder block main body and main bearing member thereof. The side view and FIG. 5 are cross-sectional views showing different embodiments of the invention. /... Cylinder block body, /2... Side cover, /3. /, f...Main bearing member, /a...Cylinder part, 15...Rough deck part, 16...Lower deck part, /7...Bulkhead part, /l...Cover additional surface , lte... water jacket outer wall section, 20...
・Skirt part, 21...Water jacket, 22・
...Crank chamber, Easy...Bearing cap part, Core...Beam part, 2g...Side wall part, 29...Oil pan.

Claims (1)

[Claims] (1) The upper deck portion has a plurality of bulkhead portions at the lower end of the lower deck portion and the upper ends of the plurality of cylinder portions arranged in series. The cylinder block body has cover mounting surfaces formed along the same plane on both sides of the lower deck part and the bulkhead part, and the cylinder block body □ is joined and supported by the cover mounting surfaces so as to cover both sides of the cylinder block body □. A plurality of bearing cap parts are bolted to the bulkhead part of the high cylinder block main body, which constitutes the skirt part of the upper half of the crank chamber and defines a quarter jacket between the upper deck part and the lower deck part. An automobile engine comprising a main bearing member integrally connected in the front and rear direction.