JPH0244003Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention relates to a spring retainer for an engine intake valve.It can be manufactured entirely from sheet metal at low cost, and the overall height of the retainer can be suppressed while increasing rigidity. Provide what you can.

<Prior Art> As shown in FIG. 1 or 6, the basic structure of a spring retainer for an intake and exhaust valve of an engine, which is the subject of the present invention, is that a large-diameter edge of a tapered cylindrical portion 1 is provided with a spring retainer extending from its outer diameter. Also, a large spring receiving flange 2 is arranged in series, and a spring positioning protrusion 3 is formed at a connecting portion 4 between the flange 2 and the cylindrical portion 1.

As shown in FIG. 6, this type of prior art involves cold-forming S45C, for example, and forming spring positioning protrusions 3 along the circumferential direction of the large-diameter edge of the tapered cylindrical portion 1. There is one in which a spring-receiving flange 2 is continuously formed on the protrusion 3.

<Problems with the prior art> However, in the above-mentioned prior art, the retainer is manufactured by cold forging, which leads to higher costs, and the protrusion of the positioning protrusion 3 from the upper end of the cylindrical portion 1 is raised. Furthermore, since the thickness of the flange portion 2 is added on top of that, the entire retainer becomes bulky, and there is a possibility that the overall height of the engine becomes high.

<Prior Art> In order to solve the problems of the prior art, the applicant proposed the following prior art.

That is, as shown in FIG.
is bent downward to form a spring positioning protrusion at the bent portion 51.

In the above-mentioned prior art, since the entire retainer is manufactured from sheet metal, costs can be reduced, and since the sheet metal 2, the cylindrical portion 1, and the positioning protrusion 3 can be formed simultaneously in one drawing process, manufacturing can be carried out quickly.

Moreover, since the positioning protrusion 3 is formed by bending the peripheral edge of the flange 2 downward, the total height of the retainer is determined only by the length of the cylindrical part 1 and the wall thickness of the flange 2. The wall thickness of the retainer is not added to the retainer, and the total height of the retainer can be suppressed.

However, in the prior art, since the retainer is manufactured from sheet metal, the thickness of the retainer is limited, especially the cylindrical portion 1 and the flange portion 2.
Since the thickness of the connecting portion 4 with the metal plate is thinner than that of a forged product, the rigidity of the connecting portion 4 may be insufficient, resulting in poor durability.

Furthermore, when the peripheral edge of the collar portion 2 is bent, this bent portion collides with the rocking locus of the rocker arm, for example.
There is a risk of damage to the rocker arm due to contact with the retainer, or interference with the retainer that may cause looseness in the valve operating function of the intake and exhaust valves, so place the valve operating members around the retainer away from the retainer. This increases the size of the entire valve train.

The technical challenges of this invention are to solve the problems associated with forged products, increase the rigidity of the retainer, and downsize the valve mechanism.

<Means for Solving the Problems> Means for achieving the above-mentioned problems will be explained below using FIGS. 1 to 4, which correspond to embodiments.

That is, in the present invention, the flange part 2, the cylinder part 1, and the spring positioning protrusion 3 are integrally formed with sheet metal, and the flange part 2
The spring positioning protrusions 3 are formed by intermittently protruding at at least a plurality of locations in the circumferential direction.

<Function> Since the positioning protrusion 3 is intermittently bulged in the circumferential direction of the flange 2, the flange 2,
The cylindrical portion 1 and the positioning protrusion 3 can be formed at the same time.

Since the positioning protrusions 3 are bulged at at least a plurality of locations in the circumferential direction of the flange 2, the bulges 3 impart a rib effect to the connecting portion 4 between the flange 2 and the cylindrical portion 1.

Moreover, since the protrusion 3 is formed by bulging the collar part 2 downward while maintaining the length of the cylindrical part 1,
The total length of the retainer depends only on the length of the cylindrical portion 1 and the wall thickness of the collar portion 2, and is not affected by the projections 3.

<Effects of the invention> (1) The entire retainer is integrally formed from sheet metal, and the flange, cylinder, and positioning protrusions can be machined at the same time, so the retainer can be manufactured at low cost and can be processed quickly.

(2) Since the overall length of the retainer is not affected by the thickness of the protrusions, the overall height of the engine can be suppressed without making the retainer bulky.

(3) Since the connection between the collar and the cylinder is reinforced with the positioning protrusion, the rigidity and durability of the retainer can be increased and the durability can be improved.

(4) The positioning protrusion is formed in a bulge around the connecting part between the flange and the cylinder, and is not formed by bending at the periphery of the flange as in the previous proposal, so it does not interfere with members around the retainer. These members can be arranged close to the retainer without causing any problems, and the entire valve mechanism can be downsized.

(5) Since the retainer is made of sheet metal, it can be made lighter than a forged product, and the mass of the entire valve train can be reduced.

Further, according to (4) above, the entire valve operating mechanism can be downsized, so it is not necessary to dispose the rocker arm etc. apart from each other as in the previous proposal, and the error in movement can be reduced accordingly.

Therefore, as a whole, the response sensitivity of the valve train system can be increased and the speed of the engine can be increased.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a vertical front view of the spring retainer, FIG. 2 is a bottom view thereof, FIG. 3 is a perspective view thereof, and FIG. 4 is a vertical right side view of the main part of the overhead valve engine.
A cylinder 6 is formed in the center of a cylinder block 5 of an overhead valve engine E, and a piston 7 is fitted therein so as to be vertically slidable.

The cylinder head 8 and the head cover 10 are assembled in order above the cylinder block 5, and an intake port 11 and an exhaust port are opened on the left and right sides of the cylinder head 8.
In addition, exhaust valves are arranged so as to be openable and closable, respectively, facing the exhaust ports.

The upper end surface of the cylinder block 5 is recessed, and an arm-shaped head cover 10 is placed over the recess from above to form a rocker arm chamber 14 inside.

The Rotsuka arm 15 is placed in the center of the Rotsuka arm chamber 14.
is attached so as to be swingable, and a push rod insertion hole 16 is made at the rear thereof.

Further, a valve camshaft is mounted on the rear upper part of the crank chamber, the camshaft is interlocked with the crankshaft, and the lower end of the push rod 17 loosely fitted into the push rod insertion hole 16 is connected to the valve camshaft. its upper end 1
8 are made to face the input end 19 of the rocker arm 15 so as to be able to come into contact with each other.

Insert the intake valve 12 into the front of the rocker arm chamber 14 so that it can slide up and down, with the intake valve 12 tilting backward toward the upper end.The valve head 20 of the intake valve 12 is brought into contact with the valve seat 21 of the intake port.・End 2
3 facing the output end 22 of the rocker arm 15.

Attach the locker 24 to the stem end 23, fit and fix the spring retainer R to the locker 24 from below, and interpose the valve spring 25 between the retainer R and the bottom wall of the rocker arm chamber 14, The intake valve 12 is biased upward.

The spring retainer R is composed of a cylindrical portion 1, a flange portion 2, and a spring positioning protrusion 3, and is integrally formed by drawing a sheet metal made of SPcc, for example.

The cylindrical portion 1 has a tapered shape, and the tapered inner circumferential surface is formed so as to be in close contact with the outer circumferential surface of the cotter 24, and a spring receiving flange 2 larger than the outer diameter is connected to the large diameter edge of the tapered portion. Set up

The spring positioning protrusion 3 is formed in the connecting part 4 between the collar part 2 and the cylinder part 1. It is formed by intermittently bulging the dividing part downward.

In this case, the portion of the tapered inner circumferential surface of the cylindrical portion 1 that is at the same height as the positioning protrusion 3 and on which the protrusion 3 is not formed should be in close contact with the cotter 24 while maintaining a smooth surface. As a result, the entire length of the cylindrical portion 1 and the thick portion of the flange portion 2 as a whole serve as a clasp receiving surface.

Therefore, if the positioning protrusion 3 is formed to bulge out continuously over the entire circumferential direction of the flange 2, the vertical width of the protrusion 3 cannot receive the cotter 24, so that the protrusion 3 will not fit into the flange. It is necessary to form them long at two locations facing each other in the circumferential direction of the tube, or to intermittently bulge out at more appropriate locations.

As described above, since the spring retainer of the present invention is integrally formed with sheet metal, it goes without saying that it can be applied not only to intake valves but also to exhaust valves.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional front view of the spring retainer, FIG. 2 is a bottom view thereof, FIG. 3 is a perspective view thereof, and FIG. 4 is an overhead valve engine. FIG. 5 is a view equivalent to FIG. 1 showing a previous plan, and FIG. 6 is a view equivalent to FIG. 1 showing a prior art. 1...Tapered cylinder part, 2...Spring receiving collar part, 3...Spring positioning protrusion, 4...
Connection part between 1 and 2.

Claims (1)

[Scope of utility model registration request] A spring receiving flange 2 larger than the outer diameter of the tapered cylindrical portion 1 is connected to the large diameter edge of the tapered cylindrical portion 1.
and a spring positioning protrusion 3 on the connecting part 4 of the cylindrical part 1.
In a spring retainer for an engine intake and exhaust valve, the flange 2, the cylinder 1, and the spring positioning protrusions 3 are integrally formed of sheet metal, and the spring positioning protrusions 3 are arranged intermittently at at least a plurality of locations in the circumferential direction of the flange 2. A spring retainer for an engine intake and exhaust valve, characterized in that it is formed by bulging out.