JPS5834248Y2 - valve spring retainer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a valve spring retainer for, for example, an intake/exhaust valve of an internal combustion engine.

As shown in FIG. 1, the air supply/exhaust valve 2 of the internal combustion engine 1 is constructed so that a valve spring retainer 4, which is integrated with a valve shaft 3, is urged upward by a valve spring 5 to close an air supply/exhaust port 6. ing.

In this figure, 7 is a cam that rotates the rocker arm 8 and pushes down the valve shaft 3.

Now, conventionally, the valve spring retainer 4 shown in FIG.
As shown in a, the base material is cut with a lathe to form a central cylindrical tapered surface 12 to be fitted into the valve socket 11 and a stepped seating surface 13 for receiving the valve springs 5a, 5b, and then annealed. , deburring, bonding, cold forging, heat treatment, and barrel polishing were used to complete the product, but due to the cutting process, the weight of the product tended to increase, and the processing process was slow. The disadvantage was that the cost was high due to a large amount of material loss.

The present invention was developed in consideration of these points, and aims to reduce costs by reducing the weight of the valve spring retainer, reducing the amount of machining work required, and reducing material loss during machining. The purpose is to provide a product with a shape that is comparable in strength to conventional products.

An embodiment of the present invention will be described based on FIG.

The sheet metal is pressed by means such as superplastic working, and the annular valve spring retainer 4b is integrally formed.

This valve spring retainer 4b, valve retainer 1
1, an annular folded part 22 continuously formed at the lower part of the fitted part 21, and an annular receiving part 23 continuously formed on this folded part 22. The fitting part 21 and the receiving part 23 are integrally press-molded, and an annular recessed part 24 is interposed between the fitting part 21 and the receiving part 23.

The receiving portion 23 further has an outer circular step portion 25 and an inner circular step portion 26 corresponding to the outer and inner valve springs 5a, 5b.

The inner circumferential surface of the fitting part 21 is tapered to expand upward, and the fitting part 21 is prevented from coming off by fitting the inner circumferential tapered surface 27 with the outer circumferential tapered surface of the valve connector 11. is being done.

In addition, the above-mentioned valve socket 11 is constructed by fitting the convex portion 28 on the inner circumferential surface into the concave groove 29 of the valve shaft 3.
is fixed.

Further, as shown in FIG. 4, the valve spring retainer 4c used when there is only one valve spring has an annular fitting portion 21 for the valve stopper 11 which is tapered to expand upward, and An annular folded part 22 formed by bending diagonally downward from the upper part of the part 21, and an annular receiving part 2 for the valve spring 5a, which is continuously formed on this folded part 22 and whose outer peripheral edge is bent downward.
3 are integrally press-molded with sheet metal, and the fitting part 21 and the receiving part 2 are
3, an annular recess 24 is interposed therebetween.

Next, a valve spring retainer 4d made by a conventional cutting process as shown in FIG.
An engine test was conducted on a 4° valve spring retainer manufactured by press sheet metal processing of the present invention, which is provided with a receiving part 23 and a recessed part 24, under the condition of a maximum load of 300 kg.
It was confirmed that neither of the retainers 4d and 4o suffered any flaws or deformation after 1 million rotations.

The experimental conditions at that time are explained in more detail as shown in the following table.

According to the present invention, each part of the valve spring retainer is integrally press-formed from sheet metal, making it possible to reduce its weight, greatly reduce the number of processing steps, and significantly reduce material loss during processing. For example, while the material loss of conventional machined products is approximately I compared to the base material, the material loss of the presca cutter product of the present invention is approximately equal to the base material.

Moreover, cost reduction can be achieved by these methods.

Furthermore, by continuously forming the annular fitting part for the valve cock and the annular receiving part for the valve spring through the annular folded part, a circular part is formed between the fitting part and the receiving part. Since the concave part is inserted, it is possible to save material by using a thinner sheet metal compared to the conventional cutting base material, and the recessed part has spring properties, so that the valve spring is It can effectively absorb vibrations, and the shape is strong enough to withstand the concentration of force in this area.

In this way, the special shape compensates for the lack of strength that may arise due to material savings, making it comparable in strength to conventional machined products.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an internal combustion engine, Fig. 2 is a sectional view of a conventional valve spring retainer, Fig. 3 is a sectional view showing one embodiment of the valve spring retainer of the present invention, and Fig. 4 is another embodiment. FIG. 5a is a cross-sectional view of the conventional valve spring retainer used in the experiment, and FIG. FIG. 21... Fitting part, 22... Folding part, 23... Receiving part, 24... Recessed part.

Claims (1)

[Scope of utility model registration request] An annular fitting part for the valve cock, an annular folded part continuously formed on the fitting part, and an annular receiving part for the valve spring continuously formed in this folded part are integrated with sheet metal. A valve spring retainer characterized by being press-molded and having an annular recess interposed between a fitting part and a receiving part.