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Bearing structure of cam shaft

A camshaft and bearing technology, applied in the lubrication of valve accessories, valve details, mechanical equipment, etc., can solve problems such as poor lubrication of the camshaft 2

Inactive Publication Date: 2004-09-29
ISUZU MOTORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the camshaft 2 becomes poorly lubricated

Method used

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  • Bearing structure of cam shaft
  • Bearing structure of cam shaft
  • Bearing structure of cam shaft

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] One embodiment of the present invention will be described with reference to the drawings.

[0023] The camshaft bearing structure of the present embodiment is applied to the cylinder head 1 of the OHC engine, and therefore, the same components as those already described are given the same reference numerals, and description thereof will be omitted. That is, on the cylinder head 1, a plurality of bottom journals 3 are formed at predetermined intervals in the axial direction of the intake and exhaust camshaft 2, and a part of the bearing surface 5 is cut off on each bottom journal 3. The spot facing portion 6 is formed.

[0024] Specifically, the basic shape of the bearing surface 5 of the bottom journal 3 is as follows figure 1 As shown in (a), it is a roughly rectangular shape viewed from above, such as figure 1 As shown in (b), it is semicircular when viewed from the side. on the bearing surface 5, as figure 1 As shown in (a), a spot facing portion 6 is formed a...

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PUM

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Abstract

Provided is a bearing structure of a camshaft capable of preventing scraping-off of oil due to a knife edge. In this bearing structure of a camshaft, a spot facing part 6 is formed to a lower journal 3 supporting a camshaft 2 in a manner to notch one part of a bearing face 5. A relief part 11 indented for separating from a surface of the camshaft 2 is formed to a communication part of the bearing face 5 and the sport facing part 6, and one part 11a of an edge connecting the relief part 11 with the bearing face 5 is formed along a rotational direction A of the camshaft 2.

Description

technical field [0001] The present invention relates to a camshaft bearing structure in which a spot facing portion is formed on a part of a bearing surface of a bottom journal. Background technique [0002] like image 3 and Figure 4 As shown, the camshaft 2 installed on the cylinder head 1 of the OHC (overhead cam shaft) engine is clamped on the bottom journal 3 arranged on the cylinder head 1 and the not-shown shaft installed on the upper part thereof. between the upper journals and is supported by the shaft. A plurality of bottom journals 3 are provided at predetermined intervals in the axial direction of the camshaft 2 . [0003] Lubricating oil is supplied from the cylinder head 1 side to each bottom journal 3 to lubricate the gap between each bottom journal 3 and the camshaft. In addition, there is also known a type in which lubricating oil is supplied to only one bottom journal 3 and lubricating oil is supplied to the other bottom journal 3 via the camshaft 2 . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/04F01L1/053F01M9/10F02F1/38
CPCF01L2001/0537F02B2275/18F01M9/10F01L1/0532F02F1/38
Inventor 饭岛章
Owner ISUZU MOTORS LTD