JPS6141466Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thrust receiving structure for a rotating shaft that is particularly suitable for use in a camshaft of an internal combustion engine. FIG. 1 is a cross-sectional view of a main part showing a thrust receiving structure for a camshaft of a conventional internal combustion engine.
is rotatably supported by a housing 14 via a bearing metal 12 at its intermediate portion, and a gear 20 is attached to its shaft end 16 via a key 18. The camshaft 10 is driven by the crankshaft by meshing with a gear provided on a crankshaft (not shown). Further, a cylinder block (not shown) is provided with a wall surface 24 facing the shaft end surface 22 of the camshaft 10, and a cover 26 formed of aluminum, iron plate, sheet metal, etc. surrounds the gear 20 and other gears. , is fixed to the crankcase etc. with bolts etc.
Note that an annular protrusion 28 is formed in a portion of the wall surface 24 that faces the shaft end surface 22 .

In the above configuration, when the camshaft 10 rotates, a thrust force is generated in the left and right directions in the figure, and the camshaft 10 moves left and right. At this time, movement of the camshaft 10 to the right is regulated by the contact between the gear 20 and the housing 14, and movement to the left is regulated by the contact between the shaft end surface 22 and the protrusion 28. However, the wall surface 24 (i.e., the cover 26) on which the protrusion 28 is formed often forms a flat surface with a large area, and therefore the shaft end surface 22
There was a problem in that the sound generated when the protrusion 28 came into contact with the protrusion 28 echoed loudly, resulting in noise.

In order to eliminate such problems, the gap C between the shaft end face 22 and the protrusion 28 can be minimized or eliminated. However, due to variations in the dimensional tolerance of each member, assembly errors, etc. 0.5mm
It is unavoidable that a gap C between the front and rear ends will occur.

The present invention has been proposed in view of the above, and includes a rotating shaft, a cover having a wall surface facing the shaft end surface of the rotary shaft, and either the shaft end surface or the portion of the wall surface facing the shaft end surface. The gist of the invention is a thrust receiving structure for a rotating shaft, characterized in that the elastic body is mounted and provided with a gap between the shaft end face or the other of the part facing the shaft end face. be.

Embodiments of the present invention will be described in detail below with reference to the drawings. In each figure, the same members as those shown in FIG. 1, or members having substantially the same functions, are designated by the same reference numerals, and their explanations will be omitted.

2 and 3 are cross-sectional views of main parts showing the structure of the first embodiment of the present invention, in which the wall surface 24 of the cover 26 is an annular projection formed in a portion facing the shaft end surface 22 of the camshaft 10. A bottomed cylindrical plug 32 made of an elastic material such as synthetic resin or rubber is fitted into the portion 30 . As shown in FIG. 3, the plug 32 includes a core metal 3 made of sheet metal and having a bottomed cylindrical shape or a dish shape.
An elastic body 36 made of synthetic resin or rubber is pasted or baked on the outer surface of the elastic body 3.
6 is formed to protrude from the open end of the core metal 34.

According to the first embodiment of the present invention, the movement of the camshaft 10 to the left in the figure due to the thrust force is regulated by the shaft end surface 22 coming into contact with the elastic body 36, and The impact force due to the above elastic body 3
6, so it does not generate noise as in the conventional case.

FIGS. 4 and 5 are sectional views of essential parts showing modifications of the first embodiment, in which the shapes of the plugs 32 attached to the cover 26 are varied, as is clear from the figures. In the modification shown in FIG. 4, a flange portion 40 extending in the radial direction and an annular projection portion protruding from the outer peripheral edge of the flange portion 40 in the direction of the shaft end surface 22 are provided on the outer peripheral surface of the rod-shaped core member 38. The plug 32 is constructed by attaching an elastic body 44 having a flange 42 formed therein, and in the modified example shown in FIG.
The plug 32 is constructed by fitting a substantially annular elastic body 50 onto one end of a rod-shaped core member 48 having a ring 6 formed thereon.

FIG. 6 is a cross-sectional view of a main part showing the structure of a second embodiment of the present invention, in which the plug 32 shown in FIG. It is something. According to the second embodiment, in addition to achieving the same effects as the first embodiment,
As is clear from the figure, there is no need to provide projections, holes, etc. on the wall surface 24 of the cover 26, and the cover 26 can be a simple flat plate.

FIG. 7 shows a modification of the second embodiment, in which a plug 32 having the same shape and length as the plug 32 shown in FIG. 4 is attached to the shaft end surface 22 of the camshaft 10.

Although each of the above embodiments shows the case where the present invention is applied to a camshaft of an internal combustion engine, it goes without saying that the present invention is not limited to this and can be widely applied as a thrust receiving structure for various rotating shafts. do not have.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the conventional structure, Fig. 2 is a sectional view showing the structure of the first embodiment of the present invention, Fig. 3 is a sectional view of essential parts of the first embodiment, Figs. 4 and 5. 6 is a cross-sectional view of main parts showing a modification of the first embodiment, FIG. 6 is a cross-sectional view of main parts showing the structure of a second embodiment of the present invention, and FIG. 7 is a main part sectional view of a modification of the second embodiment of the present invention. FIG. 10...Cam shaft, 22...Shaft end surface, 24...Wall surface, 26...Cover, 32...Plug, 36, 4
4,50...Elastic body.

Claims (1)

[Scope of utility model registration request] A rotating shaft, a cover having a wall surface facing the shaft end surface of the rotating shaft, and a cover attached to either the shaft end surface or a portion of the wall surface facing the shaft end surface and facing the shaft end surface or the shaft end surface. A thrust receiving structure for a rotating shaft, comprising an elastic body spaced apart from the other part.