JPH0573204U - Valve drive for internal combustion engine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a valve operating device provided with a versatile pad holder without increasing weight and cost. [Structure] A semi-cylindrical portion 14 of a thin plate holder 13 is elastically fitted to the tip of a rocker arm 4, and the semi-cylindrical portion 1 is
At the lower end of No. 4, a tapered pan 15 for integrally holding the truncated cone-shaped slide pad 10 by fitting the pad small diameter portion downward is attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve operating system for an internal combustion engine such as an automobile.

[0002]

[Prior Art]

 In valve trains such as OHC, it is well known to assemble an adjusting screw to a rocker arm or to support the base end of the rocker arm with a lash adjuster for zero adjustment of valve clearance.

Further, in such a valve operating device, it is also known that a slide pad having a concave portion that comes into line contact with a spherical portion on the rocker arm side is slidably arranged at a shaft end portion of the valve.

For example, as shown in FIG. 5, the adjusting screw 5 is screwed into the tip of the rocker arm 4 which is swung about the rocker shaft 3 by the cam 2 of the camshaft 1, and the lower end of the adjusting screw 5 is screwed. The spherical portion 6 is formed integrally with the portion.

On the other hand, a slide pad 10 having a concave portion 9 that comes into line contact with the spherical surface portion 6 is slidably mounted on the shaft end portion of the intake / exhaust valve 8 fitted in the cylinder head 7, and It is supported by a tubular guide 12 fitted to the retainer 11 with some space. That is, the guide 12 prevents the slide pad 10 from falling off.

[0006]

[Problems to be solved by the device]

 However, in the above-described conventional valve operating device, the guide 12 for holding the slide pad 10 is large, and the spring retainer 11 is also increased accordingly, resulting in an increase in valve operating system weight. was there.

In addition, the shape of the spring retainer 11 is changed, and the conventional product cannot be used, so that there is a drawback that the cost is increased.

As a holding member for the slide pad, there is disclosed in Japanese Unexamined Patent Publication No. Sho 64-53007 and Japanese Unexamined Patent Publication No. Sho 62-126211, which is connected to a piston member incorporated at the tip of a rocker arm and is behind the slide pad. Although a guide member that engages with is proposed, it is limited to those equipped with a piston member and cannot be applied to the valve operating device equipped with the adjusting screw or lash adjuster described above, and it is versatile. There is no.

The present invention has been proposed under such circumstances, and an object of the present invention is to provide a valve operating device provided with a versatile pad holder without increasing weight and cost.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the structure of the present invention is a valve operating system for an internal combustion engine in which a slide pad having a concave portion capable of making line contact with a spherical portion on the rocker arm side is arranged at the shaft end portion of the valve. A semi-cylindrical portion of the thin plate holder is elastically fitted to the tip of the rocker arm, and an annular tray portion for holding the slide pad is integrally attached to the lower end of the semi-cylindrical portion.

[0011]

[Action]

 According to the above construction, a pad holder that is light in weight, can use a conventional spring retainer, and is compatible with various types of valve operating devices can be achieved.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, between the shaft end of the intake / exhaust valve 8 and the adjust screw 5 screwed into the tip of the rocker arm 4, there is a recess 9 that can come into line contact with the spherical portion 6 at the lower end of the adjust screw. The slide pad 10 having the is arranged.

A semi-cylindrical portion 14 of a thin plate holder 13 is elastically fitted to the tip of the rocker arm 4. In the example shown in the figure, the rocker arm 4 is sandwiched between the upper half side portions of the half cylinder portion 14 at both end portions thereof.

As shown in FIG. 2, a taper cylinder-shaped tray pan 15 having a lower small diameter is integrally attached to the lower end of the half cylinder portion 14, and the tray pan 15 is formed in a truncated cone shape. The slide pad 10 is fitted and held by projecting the small diameter portion side downward.

The thin plate holder 13 is molded and manufactured using a synthetic resin or a sheet metal material.

Since other configurations are the same as those in FIG. 5, the same members and parts as those in FIG. 5 are designated by the same reference numerals, and the duplicated description will be omitted.

With such a configuration, when the adjusting screw 5 is assembled to the rocker arm 4, the slide pad 10 and the thin plate holder 13 can be simultaneously and easily assembled. By providing a cutout or the like in the tray portion 15 of the thin plate holder 13, the thin plate holder 13 can be removed even after the assembling.

Since the holder 13 is made of a thin plate and is lightweight, the weight of the valve train is not increased. Further, since the spring retainer 11 which has been conventionally used can be used, it is economical. Further, it can be applied to a valve operating device for supporting the base end portion of the rocker arm 4 by a lash adjuster other than the illustrated example, so that it has versatility.

3 and 4 show another embodiment of the present invention. This is an example in which a double-headed rocker arm 4 in a multi-valve engine is equipped with a double-type thin plate holder 13 integrated in a half cylinder portion 14, and the embodiment shown in FIGS. The same action and effect as can be obtained.

[0020]

[Effect of the device]

 As described above, according to the present invention, the slide pad is held by the thin plate holder attached to the tip of the rocker arm, so that the weight and cost of the valve train are not increased and the pad is versatile. It is possible to provide a valve operating device equipped with a holder.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view of the thin plate holder.

FIG. 3 is a plan view showing another embodiment of the present invention.

FIG. 4 is a structural explanatory view of a thin plate holder.

FIG. 5 is a sectional view of a conventional example.

[Explanation of symbols]

 4 Rocker arm 5 Adjust screw 6 Spherical part 8 Suction / exhaust valve 9 Recessed part 10 Slide pad 13 Thin plate holder 14 Half cylinder part 15 Saucepan part

Claims (1)

[Scope of utility model registration request] 1. A valve operating system for an internal combustion engine, wherein a slide pad having a concave portion capable of making a line contact with a spherical portion on the rocker arm side is arranged at a shaft end portion of the valve. 2. The valve operating device for an internal combustion engine, wherein the semi-cylindrical portion is elastically fitted and an annular pan portion for holding the slide pad is integrally attached to a lower end of the semi-cylindrical portion.