JPH0482421U

JPH0482421U -

Info

Publication number: JPH0482421U
Application number: JP1990125780U
Authority: JP
Priority date: 1990-11-28
Filing date: 1990-11-28
Publication date: 1992-07-17

Description

[Brief explanation of drawings]

第１図及び第２図は本考案の第１実施例を示し
、第１図はクランク軸受構造を示す断面図、第２
図は第１図の−矢視図、第３図は第２実施例
を示す。第４図は一般的な従来のクランク軸の軸
受構造を示す断面図、第５図は上部軸受体がシリ
ンダ部に一体成形された従来のクランク軸の軸受
構造を示す断面図、第６図は第５図の−矢視
図、第７図は軸受体の振れを説明する図、第８図
と第９図と第１０図と第１１図は上部軸受体をリ
ブ部の凹部に挿嵌したタイプの従来例、第１２図
と第１３図と第１４図は、振れ防止のためタイト
ピンを用いた従来例である。２……シリンダ部、３……クランクケース部、
６……クランク軸、１０……シリンダ、１６……
当接面、１７ａ……合せ面、１８ａ……ピン孔、
１８ｂ……ピン孔、２０……タイトピン、１０４
……上部軸受体、１０５……ベアリングキヤツプ
、１１２……リブ部、１１４……凹部。 1 and 2 show a first embodiment of the present invention, FIG. 1 is a sectional view showing the crank bearing structure, and FIG.
The figure shows a - arrow view in FIG. 1, and FIG. 3 shows a second embodiment. Fig. 4 is a cross-sectional view showing a general conventional crankshaft bearing structure, Fig. 5 is a cross-sectional view showing a conventional crankshaft bearing structure in which the upper bearing body is integrally molded into the cylinder part, and Fig. 6 is a cross-sectional view showing a conventional crankshaft bearing structure in which the upper bearing body is integrally molded into the cylinder part. Figure 5 - arrow view, Figure 7 is a diagram explaining the runout of the bearing body, Figures 8, 9, 10 and 11 are views of the upper bearing body inserted into the recess of the rib part. Conventional examples of the type shown in FIGS. 12, 13, and 14 are conventional examples in which tight pins are used to prevent vibration. 2...Cylinder part, 3...Crankcase part,
6...Crankshaft, 10...Cylinder, 16...
Contact surface, 17a... mating surface, 18a... pin hole,
18b...Pin hole, 20...Tight pin, 104
... Upper bearing body, 105 ... Bearing cap, 112 ... Rib part, 114 ... Recessed part.

Claims

[Scope of utility model registration request]

An internal combustion engine in which an upper bearing body supporting the crankshaft is separately inserted into a recess in a rib part that partitions the crankcase part of each cylinder of the engine, and the upper bearing body is fixed to the rib part together with a bearing cap. In the crankshaft bearing structure of A pin hole that straddles the upper bearing body and the rib portion at the same time is formed in the abutment surface in the cylinder axial direction with the upper bearing body, and a pin hole opposite to the pin hole is formed in the bearing cap, and a tight pin is inserted into both of these pin holes. An internal combustion engine crankshaft bearing structure characterized by press-fitting.