JPS6081451A - Cylinder block of internal-combustion engine - Google Patents

Abstract

PURPOSE:To aim at making a cylinder block lightweight, by integrally incorporating metal sleeves for sliding pistons and thermohardening synthetic resin outer walls, with a metal fremework. CONSTITUTION:Support columns 6 of a cast-iron type framework F are formed with boss sections 6a, 6b in which formed are bolt through-holes 10 for coupling a crankshaft bearing block and a cylinder head with the framework F. Fitting mail sections 5a which are formed in the bottom end sections of cylinder sleeves 5 are fitted in fitting holes 12 in bottom walls 8 that are integrally incorporated with lower rib plates 7 of the framework F, through the intermediary of seal rings 13. The support columns 6 of the framework F and the rib plates 7 are molded with a thermohardening synthetic resin outer wall section so that window holes 11 in the rib plates 7 are shielded by the outer wall sections with a water jacket being formed between the cylinder sleeves 5 and the outer wall section.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lightweight and robust cylinder block for an internal combustion engine, which is suitable primarily for use in vehicles such as automobiles.

In general, the engine body of an internal combustion engine, that is, the cylinder flock, cylinder head, crankcase, etc., is required to have high physical properties such as high strength, heat resistance, and wear resistance. has been done.

However, in order to improve the performance of internal combustion engines for automobiles and the like, a major issue is how to reduce the weight of the internal combustion engine. Therefore, recently, parts of internal combustion engines are made of synthetic resin with low specific gravity.
Although devices made of ceramic materials have been proposed, they are all extremely small parts and do not contribute to reducing the weight of internal combustion engines, and do not have the strength or strength that the engine requires. Physical properties such as heat resistance cannot be obtained, and the cost is high, making it unsuitable for practical use.

Therefore, the present invention focuses on the fact that the cylinder block has relatively few highly heated parts even in the main body of an internal combustion engine, and on the recent development of thermosetting synthetic resin materials with excellent physical properties.
Achieving significant weight reduction without compromising physical properties such as heat resistance,
The object is to provide a cylinder block for an internal combustion engine.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a two-cylinder internal combustion engine will be described below with reference to FIGS. 1 to 3.

In FIG. 1, an internal combustion engine main body E consists of a cylinder block 1, a cylinder head 2 which is superimposed on the upper surface of the cylinder block 1, and a crankcase 3 which is connected to the lower part m1 of the cylinder block 1.

In order to maintain the necessary strength, heat resistance, wear resistance, etc. of the cylinder block 1, the omitted parts and the cylinder sleeve 5 on which the piston 4 is slidably connected are made of a metal material such as cast iron. The remaining portion is made of thermosetting synthetic resin material such as phenol resin.

Next, the structure of the skeleton frame F, which is the skeleton of the cylinder block 1, will be explained mainly with reference to FIG.

The skeletal frame F is formed into a cube shape from cast iron, and has a total of six columns 6 arranged at intervals around its outer periphery, and a rib plate 7 that integrally connects the sides of the adjacent columns 6. It is composed of a bottom wall 8 that covers the lower surface, and a crank bearing upper half 9 that connects the lower portions of each of the two columns 6 that are aligned in the vertical direction.

Each of the pillars 6 is formed in a cylindrical shape, and the center r51
5 is provided with a port insertion hole 10 that opens at the lower end thereof, and a thick boss portion 6a at the upper and lower ends thereof.

6z. A punch hole 11 is formed in the center of the rib plate, and the molding of the entire skeleton frame F is reduced. A fitting hole 12 is provided in the center of the bottom wall 8 of each cylinder.
is formed, and a fitting portion 5σ of the silling sleeve 5, which will be described in detail later, is fitted into this fitting hole 12. Further, the crank bearing upper half 9 is formed thick, and a semicircular bearing surface is formed on the lower surface thereof.

As shown in FIG. 1, a silling sleeve 5 made of the same material is integrally formed at the bottom of the cast v (reinforcement/reinforcement node 2), and a fitting group 5α of a slightly smaller diameter is formed at the lower end of this silling sleeve 5. , is fitted into the fitting hole 12 of the bottom wall 8 through the sole ring 13 in a watertight manner.

The pillars 6 and rib plates 7 of the skeleton frame i/' are integrally cast into the outer wall part r' made of thermosetting synthetic resin, and the window holes 11 of the rib plate 7 are formed by the outer wall part IV. shielded. An annular water jacket 14 is formed between the synthetic resin outer wall portion I4y and the metal ring sleeve 5, and the upper end of this water jacket 14 is open and communicates with the water jacket 15 on the cylinder bend 2 side. Ru.

As shown in FIG. 1, the lower portion of the synthetic resin outer wall portion W expands laterally and extends downward to form the upper half portion 3a of the crankcase 3. An upstream intake pipe 16, which forms a part of the intake pipe 17L, is integrally formed on one side of the upper half portion and the outer wall portion W (on the left side in FIG. 1), with a gap C therebetween. An air cleaner 7ic is connected to the lower end of the opening of the upstream intake pipe 16 via a seal ring 18, and an air cleaner 7ic is connected to the upper end of the opening of the upstream intake pipe 16. are connected via a seal ring 19.

The cast iron sill head 2 has an intake port 21 that extends vertically and communicates with a combustion chamber 20 formed therein. The open end of the side intake pipe 17 is connected. This downstream intake pipe 17 is connected to the shilling head 2.
It is curved into a loop shape so as to cover the upper surface and the f11 surface, and its open lower end is connected to the upstream intake pipe 16 as described above. By forming this downstream intake pipe 16 into a loop shape as described above, it is possible to make the entire internal combustion engine more compact. A fuel control injection nozzle N is provided in a portion of the downstream intake pipe 17 near the intake boat 21 . As usual, the 7-ring throat 2 includes an intake valve 22 that opens and closes the intake port 21, its valve mechanism 23, and a spark plug 2.
4, and furthermore, although not shown, the intake ball l.2
An exhaust port, an exhaust valve for opening and closing the bow 1, and its valve operating mechanism are provided in parallel with the bow 1.

Further, the shilling head 2 is covered with a head cover 25 made of thermosetting synthetic resin.

As shown in FIG. 1, a crank bearing block 26 is superimposed on the lower surface of the cast iron frame F. A bolt hole 27 drilled in the crank bearing block 26, and the bolt insertion hole 10 drilled in the column 6 of the skeleton frame F.
Bolts 30 are passed through the bolt holes 29 drilled in the sill head 2, and by screwing a Nand 31 onto the upper end of each through bolt 30, the crank bearing block 26, the shilling The block 1 and the shilling head 2 are firmly connected together, and it is possible to prevent the shilling block 1, which has many synthetic resin parts, from being distorted or deformed.

The crank bearing block 26 is attached to the skeleton frame 1.
='It is equipped with a plurality of crank bearing lower half parts 26L:L facing the plurality of lower crank bearing upper half parts 9, and two shafts are inserted into each crank bearing lower half part 26cL from the lower surface thereof. By screwing the bolt 32 into the crank bearing upper half 9, the connection between the crank bearing upper half 9 and the crank bearing block 26 becomes even stronger.

On the lower surface of the synthetic resin crankcase lower half 3a,
Similarly, a lower crankcase half 3/) made of Jd material is connected via a seal ring 33, and a cover wall 37 of the crankcase lower half 3b is integrated into the crankcase 3 via a rib piece 36. As shown, this cover wall 37 covers the outer peripheral surface and lower surface of the crank bearing block 26. Skeletal frame/'crank bearing' - half part 9
A crank l1qI140 is rotatably supported via a surface bearing 39 in a bearing hole 38 formed by the semicircular bearing surface of the crank bearing block 26 and the semicircular bearing surface of the crank bearing lower half 26a of the crank bearing block 26. The piston 4 is slidably fitted into the cylinder sleeve 5 of the crankshaft 40 via a connecting rod 41 as usual.
are concatenated.

An oil pan 42 made of iron plate is oil-tightly connected to the lower half portion 3h of the crankcase via a seal ring 43.

As mentioned above, the shilling block 1 of the engine body E excludes the skeleton frame F and the shilling sleeve 5 (outer wall portion try,
In other words, the part that occupies a large volume of the entire shilling block 1 is made of a thermosetting synthetic resin material whose specific gravity is significantly lower than that of metal, and the shilling block 1
The total weight of the product is significantly reduced. Also shilling block 1
is reinforced by a cube-shaped skeleton frame F that has sufficient strength against external forces in three-dimensional directions, so most of the external forces exerted on the shilling block 1 can be received by this skeleton frame F. Further, the silling sleeve 5 on which the piston 4 slides is formed of cast iron and is fitted into the fitting hole 12 of the bottom wall 8 of the frame frame F to be stably supported and guide the movement of the piston 4 accurately and smoothly. It has enough wear resistance to withstand sliding. In addition, the heat load on the outer wall portion W is relatively small, and this evening
Since the water jacket 14 through which cooling water flows is formed between the wall portion W and the silling sleeve 5, even if the outer wall portion I+' is made of synthetic resin material, the heat resistance required for the silling block 1 is sufficient. Guaranteed.

FIG. 4 shows a second embodiment of the invention. In this embodiment, the silling sleeve 5 is formed separately from the cylinder bend 2; be done.

As is clear from the above embodiments, according to the present invention, a shilling block is housed in a cubic metal frame, with a space left in the frame, and is integrally connected to the frame. , consisting of a metal silling sleeve for sliding pistons, and a thermosetting synthetic resin outer wall part integrally joined to the skeletal frame so as to surround the outer periphery of the skeletal frame, and between the outer wall part and the silling sleeve. The silling block has a water jacket for the circulation of cooling water, so the part that occupies a large volume of the shilling block is made of thermosetting synthetic resin material with low specific gravity, making it possible to significantly reduce its total weight. It is possible to significantly reduce the weight of the entire engine.

In addition, the metal skeleton frame is formed in a cubic shape and has sufficient strength against external forces in three-dimensional directions, and works in conjunction with the metal silling sleeve to sufficiently compensate for the reduced strength of the synthetic resin outer wall. can. Furthermore, the sillage sleeve can ensure light and smooth sliding movement of the piston.

In addition, the silling block has an outer wall part with a relatively small heat load made of synthetic resin, and the outer wall part and
Since a water jacket is formed between the silling sleeves that are heated to high temperatures, there is no risk that the heat resistance of the silling block as a whole will be impaired.

Therefore, as a whole, the silling block can significantly reduce the TOHO while ensuring the necessary physical properties such as strength, side heat resistance, abrasion resistance, and impact resistance. be.

[Brief explanation of the drawing]

Figures 1 to 3 show a first embodiment of the internal combustion engine of the present invention, where Figure 1 is a longitudinal cross-sectional view of the engine, Figure 2 is a cross-sectional view taken along the line ■-■ in Figure 1, and Figure 3121 is a frame frame. FIG. 4 is a longitudinal sectional view of a main part showing a second embodiment of the internal combustion engine of the present invention. L... Internal combustion engine body, F. Skeletal frame τ frame, W. Outer wall portion, 1... Cylinder block, 4... Piston, 5...
・Silling sleeve, 6... Support, 7 Rib plate, 8・
・Bottom wall, 12... Inset hole, 14 Dear Commissioner of the Japan Patent Office 1. Display of 117 Patent Application No. 187790 (1982), Relationship with the case of the person making the amendment Name of Patent Applicant (532) Honda Motor Co., Ltd. 4, Agent
Person 105 Address 4-4-5 Shinbashi, Minato-ku, Tokyo Second/Mura Building lru, -;, Jllii Name 47187) Patent attorney Ken Ochiai: 11℃
・ ゛Telephone Tokyo 434-4151 ”'- 5 Date of amendment order

Claims (1)

[Claims] ■ A silling block that constitutes a part of the internal combustion engine main body includes a cubic metal skeleton frame, which is housed with a gap in the skeleton frame, and is integrally connected to the skeleton frame. It consists of a metal silling sleeve for piston sliding, and an outer wall made of thermosetting synthetic resin that is integrally joined to the skeletal frame so as to surround the outer periphery of the skeletal frame, and between the outer wall and the silling sleeve. A shilling block for an internal combustion engine, characterized by forming a water jacket for the circulation of cooling water. (i) In the silling block for an internal combustion engine as set forth in claim 0, the metal skeleton frame is formed in a cubic shape, and includes a plurality of pillars arranged at intervals around the outer circumference thereof, and a plurality of pillars adjacent to each other. a rib plate that integrally connects the supporting columns, and a bottom wall that covers the lower surface and has a fitting hole for fitting and sliding the silling sleeve.
Schilling block of internal combustion engine 111. ■ The silling block for an internal combustion engine according to claim 0, in which the metal silling sleeve is integrally formed with the throat of the sill. ■ As described in claim 0 A 7-ring block for an internal combustion engine, wherein the metal silling sleeve is formed separately from the shilling head, and its upper edge is fitted into the shilling head.