JP3435555B2 - Manufacturing method of engine valve - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to the lower end of the shaft portion, a method of manufacturing the engine <br/> valves comprising a backing plate to prevent the oil falling to the umbrella portion side.

[0002]

2. Description of the Related Art As schematically shown in FIG. 5, a valve body (03) including an umbrella member (01) and a shaft member (02), that is, an engine valve, has a shaft member (02) whose cylinder head (shown in FIG. The valve guide (04) is press-fitted into the
It is driven by pressing the shaft end with a rocker arm (05) or a tappet (not shown).

During operation of the engine, the shaft member (02) is guided by the valve guide (04) and repeats a reciprocating sliding motion at a high speed, and therefore, the shaft member (02) and the valve guide (04). The contact surfaces of the two are easily worn or seized. In order to prevent this, lubricating oil is made to flow through a slight gap between the shaft member (02) and the valve guide (04) to lubricate the sliding surfaces of each other.

However, when an excessive amount of lubricating oil flows in from the gap between the shaft member (02) and the valve guide (04), a surplus lubricating oil leaks to the umbrella portion (01) side, a so-called oil falling phenomenon occurs, Since the consumption rate of the lubricating oil increases, or problems such as carbonization and deposition on the surface of the umbrella member (01) occur,
A lip seal (06) may be attached to the upper end of the valve guide (04) to regulate the inflow amount of lubricating oil.

If the lip seal (06) deteriorates with time due to long-term operation of the engine, the sealability at the initial stage of mounting may gradually deteriorate. In this case, the inflow amount of the lubricating oil increases, this flows out to the umbrella member (01) side and gradually carbonized and accumulated, and the umbrella member (01) is burned,
This may cause gas leaks and the like, which may cause deterioration of engine performance.

[0006] In order to prevent such a problem, traditional
Is a shaft member located in the port in the cylinder head
An annular receiving plate (07) is fixed to the lower end of (02) by shrink fitting, welding, etc., and the lubricating oil leaked from the gap between the shaft member (02) and the valve guide (04) is hot. The umbrella member (01) is prevented from flowing down directly.

[0007]

[SUMMARY OF THE INVENTION] As traditional described above, in the engine valve fixed to the shaft member (02) by the receiving plate (07) to shrink fitting, welding, or the like, in the former case, received by machining or the like It is necessary to improve the dimensional accuracy of the through hole of the plate (07), and the fixed position of the receiving plate (07) may shift due to the difference in coefficient of thermal expansion between the receiving plate and the shaft portion during engine operation. In the latter case, the welding heat causes strain and
The backing plate (07) may be separated from the welded part due to bending of the (02) or vibration during engine operation.

Further, in any fixing means, the receiving plate (0
There is a problem that the number of steps required for mounting 7) increases and the manufacturing cost increases.

The present invention has been made in order to solve the above-mentioned problems, and prevents the receiving plate from moving or peeling, and makes it extremely easy to use the receiving plate without using fixing means such as shrink fitting or welding. and it has an object to provide a method of manufacturing the engine valves that make it possible to inexpensively provide.

[0010]

In order to achieve the above object, an engine valve manufacturing method according to the present invention comprises a shaft member and an umbrella.
Form the members separately and join them together
A circular recess is formed on the surface so that the opening end side tapers in diameter.
The end faces of the above two members to the port of the cylinder head.
The valve body is joined by friction welding in the portion located inside
The burr that protrudes to the side during welding.
It is characterized in that a receiving plate is formed at a joint portion between the two by making the receiving plate grow . Further, the engine of the present invention
The valve manufacturing method is such that the shaft member and the umbrella member are molded separately.
In addition, the opening end side is tapered on the joint surface of the shaft member.
A circular concave portion that expands in diameter and an outer peripheral edge of the joint surface of the umbrella member
Contact the tapered inner surface of the recess of the shaft member.
Chamfers are formed respectively, and the end faces of both members are
At the portion located in the port of the cylinder head
Weld together with friction welding to form a valve body
Sometimes they produce burrs that project laterally,
It is characterized in that a receiving plate is formed at the joint part of
It

[0011]

According to the engine valve manufacturing method of the present invention,
Receiving plate can partially and Rukoto integrally provided in the valve body Runode, receiving plate can be prevented from moving unnecessarily in the axial direction. When an engine valve is manufactured by the method of the present invention ,
The backing plate can be extremely easily provided on the valve body without using shrink fitting or welding.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

It should be noted that the same members as those of the conventional example shown in FIG. 5 are denoted by the same reference numerals with the leading zero removed, and the detailed description thereof is omitted.

FIG. 1 shows an engine valve for intake formed by the method of the present invention, the valve body (3) of which is:
Nickel-chromium super heat resistant alloys (e.g. Inconel 75
1) or an umbrella member (1) made of austenitic heat-resistant steel (eg SUH36) or the like, and a shaft member (2) made of martensitic heat-resistant steel (eg SUH3), etc. The upper end surface in (1) and the lower end surfaces of the shaft member (2) having the same diameter as the upper end surface are joined to each other.

At the joint between the umbrella member (1) and the shaft member (2), that is, at the portion located in the exhaust port (not shown) of the cylinder head, an annular oil receiving plate for preventing oil drop is provided.
(8) is integrally connected to part of the umbrella member (1) and the shaft member (2).

FIG. 2 shows a manufacturing procedure of the engine valve. First, as shown in FIG. 2 (A), the front surface side of the umbrella member (1) formed through a forging process in advance is friction welded. Of the stationary side chuck (1) which is held by one of the rotating side chucks (9) and which has a shaft member (2) made of a round bar-shaped material and which faces the chuck (9) coaxially.
Hold by (0). As shown in FIG. 3, the umbrella member (1) and the shaft
On the joint surface with the member (2), the opening end side is tapered.
Circular recesses (11) of the required depth to expand are formed respectively.
Has been.

Then, as shown in FIG.
(9) is rotated to rotate the umbrella member (1) at a high speed, and at the same time, the stationary chuck (10) is moved in the direction of the chuck (9) to move the umbrella member (1) and the shaft member (2). Ring formed on the peripheral edge
The protrusions (1a) and (2a) (see FIG. 3) are brought into contact with each other .

As a result, the contact surfaces of both members are heated to a high temperature due to frictional heat, and when both ends are melted, the shaft member (2) is pressed to firmly bond the end surfaces of both members (1) and (2). In addition, an annular weld burr (W) is formed at the joint portion by the protrusion of the molten meat at the time of pressurization.

Finally, the joined valve body (3) is subjected to heat treatment, machining, etc., and each portion is finished to a predetermined size while leaving the welding burr (W). Welding burr
(W), that is, an engine valve having a receiving plate (8) is formed.

As described above , according to the method of manufacturing the engine valve of the above-described embodiment, the receiving plate (8) for preventing the oil drop is used as the umbrella member (1) and the shaft member when manufacturing the intake engine valve. (2) simultaneously with the bonding of the, and these members integrally formed with cormorants Runode, as in the prior art, there is no need to use a fixing means such as troublesome shrink fitting, welding, also received after fixation plate The position of the
There is no fear that the shaft member (2) will be bent due to thermal strain.

Further , the umbrella member (1) and the shaft member (2) are mutually
On the joining surface, a circular recess (1
When 1) is formed , as shown by the imaginary line in FIG. 3 , the annular protrusions (1a) (2a) largely protrude outward during welding, and the welding burr, that is, the protruding dimension of the receiving plate (8) increases. Therefore, it is possible to effectively receive the lubricating oil that has leaked due to the oil falling.

In the embodiment of FIG. 4 , a recess (11) similar to the above is formed on the shaft member (2) side, and an annular projection (2a) is formed on the outer peripheral edge of the end face of the umbrella member (1). The chamfered portion (1b) having substantially the same inclination as that of the tapered surface (2b) is formed, and the tapered surface (2b) and the chamfered portion (1b) are brought into contact with each other to perform friction welding.

In this way, as shown by the imaginary line,
In the initial stage of welding, not only the annular projection (2a) is pressed by the end portion of the umbrella member (1) and largely protrudes outward, but also the receiving plate (8) (welding burr) formed by it has a shaft member ( Since it curves upward in 2) (to the right in the figure), the collecting property of the lubricating oil due to the oil falling becomes good, and the amount of the lubricating oil overflowing to the umbrella member (1) side becomes extremely small.

In the present invention, the valve body (3) includes the umbrella member (1) and the shaft member, like the above-described intake engine valve.
Hollow valve in addition to (2) made of different metal materials
It can also be applied to (including a metal sodium sealing valve) and the like.

[0025]

According to the present invention, the following effects can be obtained.

(A) According to the inventions of claims 1 and 2,
For example, since the backing plate can be formed integrally with a part of the valve body,
Without using conventional fixing means such as shrink fitting or welding,
It can be formed extremely easily and at low cost.
Also, the backing plate should not be displaced or peeled in the axial direction.
Nor.

(B) As in the invention described in claim 1 , the umbrella portion
The opening end side is tapered in diameter at the joint surface between the material and the shaft member.
When a circular recess is formed and friction welding is performed,
Since the protrusion size to the
It is possible to effectively receive the lubricating oil that has been used.

(C) As in the invention described in claim 2 , the shaft portion
On the joining surface of the material, a circular recess whose opening end side expands in a tapered shape
The outer peripheral edge of the joint surface of the umbrella member and the recess of the shaft member.
Each chamfer that contacts the tapered inner surface of the
If you make it and friction weld it, the receiving plate will bend upwards,
The collection of lubricating oil due to oil falling is good, and the umbrella part
The amount of lubricating oil overflowing to the side is extremely small. That conclusion
As a result, the amount of lubricating oil carbonized and deposited on the umbrella is extremely small.
Therefore, the durability of the engine valve is improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an engine valve obtained by a manufacturing method of the present invention.

FIG. 2 shows a manufacturing procedure of an engine valve according to the present invention , (A) is a plan view showing a state in which a separately formed umbrella member and a shaft member are chucked by a friction welding machine, and (B) is friction welding. It is a partially cutaway plan view showing a state at the end.

3 is an enlarged plan view of an essential part showing a shape of the junction surface of the umbrella member and the shaft member.

4 is a similarly enlarged top plan view of a main part showing a modification Katachirei joint surface.

FIG. 5 is a front view showing an engine valve manufactured by a conventional method .

[Explanation of symbols]

(1) Umbrella member (1b) Chamfer (2) Shaft member (1a) (2a) Annular protrusion (2b) Tapered surface (3) Disc (4) Valve guide (5) Rocker arm (6) Lip seal (8) Support plate (9) Rotating chuck (10) Fixed chuck (11) Recess (W) Weld burr

Continuation of the front page (56) Reference JP-A-6-238469 (JP, A) Actual development Sho 63-102910 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F01L 3 / 20 B23K 20/12 F01L 3/08

Claims (2)

(57) [Claims] 1. A shaft member and an umbrella member are separately formed.
At the joint surface of each of them, the opening end side is tapered.
A circular concave portion that expands in diameter is formed, and the end surfaces of both members are
At the portion located in the port of the cylinder head
Weld together with friction welding to form a valve body
Sometimes they produce burrs that project laterally,
An engine characterized by forming a backing plate at the joint of the
Manufacturing method of valve. 2. A molding the shaft member and the umbrella member separately Then DOO
On the other hand, the opening end side of the joint surface of the shaft member expands in a tapered shape.
A circular concave portion on the outer peripheral edge of the joint surface of the umbrella member,
Chamfer that contacts the tapered inner surface of the recess of the shaft member
Part is formed respectively, wherein with the end faces of the two members forming the valve body are joined by friction welding in a portion located in the port of the cylinder head, by generating the burr that protrudes laterally during welding, A method for manufacturing an engine valve, which comprises forming a receiving plate at a joint between the two.