JPH0395006U

JPH0395006U -

Info

Publication number: JPH0395006U
Application number: JP244890U
Authority: JP
Priority date: 1990-01-16
Filing date: 1990-01-16
Publication date: 1991-09-27
Anticipated expiration: 2005-01-16
Also published as: JPH0721851Y2

Description

[Brief explanation of the drawing]

第１図から第５図はこの考案の一実施例にかか
る４サイクルエンジンのケース構造を示し、第１
図が４サイクルエンジンを用いた船外機の側面図
、第２図がエンジンの縦断面図、第３図がエンジ
ンの横断面図、第４図が第３図の−矢視によ
るシリンダケースの底面図、第５図が第３図のＶ
−Ｖ矢視によるクランクケースの平面図である。１１…４サイクルエンジン、１２…シリンダブ
ロツク、２４…クランクシヤフト、２６…クラン
クケース、２７…クランク室、２８，２８ｅ，２
８ｍ…軸受半部、２９，２９ｅ，２９ｍ…軸受半
部、３１，３１ａ，３１ｂ，３１ｃ…リブ、３２
，３２ａ，３２ｂ，３２ｃ…リブ、７８，８６…
溝（凹部）、８０，８０ｅ，８０ｍ…軸受部。 Figures 1 to 5 show the case structure of a four-stroke engine according to an embodiment of this invention.
Figure 2 is a side view of an outboard motor using a 4-cycle engine, Figure 2 is a longitudinal cross-sectional view of the engine, Figure 3 is a cross-sectional view of the engine, and Figure 4 is a cylinder case taken from the - arrow direction in Figure 3. Bottom view, Figure 5 is V in Figure 3
- It is a top view of the crankcase as seen from arrow V. 11... 4-cycle engine, 12... cylinder block, 24... crankshaft, 26... crank case, 27... crank chamber, 28, 28e, 2
8m...bearing half, 29, 29e, 29m...bearing half, 31, 31a, 31b, 31c...rib, 32
, 32a, 32b, 32c...rib, 78, 86...
Groove (recess), 80, 80e, 80m...Bearing part.

Claims

[Claims for Utility Model Registration] (1) In a four-cycle engine in which a crankshaft is vertically supported in a crank chamber, there is provided a space between the crankshaft and the crankshaft on the front side of the crankshaft rotation direction with respect to the cylinder axis on the wall of the crank chamber. A case structure for a four-cycle engine, characterized in that ribs extending in parallel are integrally formed, and a recess extending in parallel to the ribs is formed in the inner wall of the crankshaft chamber before the ribs in the direction of rotation of the crankshaft. (2) The four-stroke engine is a multi-cylinder engine having a plurality of cylinders, and the crank chamber wall has an intermediate bearing portion that supports the crankshaft between the cylinders, and the rib is integrated with the intermediate bearing portion. The case structure for a four-cycle engine according to claim 1, characterized in that the case structure is formed with:. (3) The four-stroke engine according to claim 2, wherein the crank chamber wall has a fractional intermediate bearing portion, and the rib is formed between these intermediate bearing portions so as to be continuous with the intermediate bearing portion. case structure. (4) In a four-stroke engine in which a crankshaft is vertically placed and supported within a crank chamber, the crank chamber is defined by joining a crank case to a cylinder block, and an inner wall of the crank case forms a part of the wall of the crank chamber. A rib is formed on the front side in the direction of rotation of the crankshaft with respect to the cylinder axis, and a rib is formed on the inner wall of the cylinder block forming a part of the inner wall of the crankshaft on the front side in the direction of rotation of the crankshaft with respect to the cylinder axis. The case structure of a 4-cycle engine is characterized by: