JPS6187946A - Valve seat ringless light alloy cylinder head - Google Patents

Abstract

PURPOSE:To aim at improvements in strength to high temperature or the like and prevention against separation, by making up an intake valve seat corresponding part of a cylinder head body into fiber reinforcing metalization, while installing a convering layer made of made of a wearproof material, making an Al alloy or the like a base material, in a valve hitting surface part. CONSTITUTION:An intake valve seat corresponding part of a cylinder head body 3 is made up into a fiber reinforced metal (FRM)2, while a covering layer 4 made of a wear-proof material, making an Al alloy or a Mg alloy a base material, is installed in a valve hitting surface part 5. At this time, as a reinforcing metallic fiber, a ferrofiber of steel of S15 or the like and cast iron or an alloy fiber of an Ni system or the like so desirable. And, as a metallic fiber, if it is a long fiber, such one of 10-300mum in filament diameter but if it is a short fiber, 2.0-20mum in filament diameter and 10-500mum in length are desirable as well as it is desirable each of them is contained at a bulking rate of 5.0-40%. With this constitution, strength to high temperature and rigidity in the valve hitting surface part 5 are well improved and, what is more, separation in the covering layer 4 is preventable.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention eliminates the valve seat inner of an internal combustion engine,
The equivalent of about 1 dollar of the note ring is made of fiber reinforced gold a<F MHt
, regarding Shida cylinder heads.

[Prior art]

In order to reduce the width of the vehicle, the cylinder head of an internal combustion engine is made of aluminum alloy, magnesium alloy, or -7 light alloy, but in general, such a light alloy cylinder head has a In order to ensure sealing performance and wear resistance, mainly iron-based valve seat rings are press-fitted, which requires a large amount of cost for cylinder head seat ring name processing, /-) IJ ring processing, press-fitting, etc. Not only was this time consuming, but the cooling effect of the valves was also reduced by 1 degree, making it necessary to use high-grade heat-resistant wear materials for the valve seats and valves, which became a bottleneck in improving engine performance.

On the other hand, the valve seat of the light metal 7 cylinder head was
6. The mother of the valve seat part (directly to O, melting J, clutsuding is still 1W due to the arrangement of alloy, -:
s t Xi t1',, I'm sorry for the inconvenience caused by JJ and others]) In response to the false cycle, I went to ', with t people11. l3, ljf's 21; yo5. ;i (Sex: 8 clearness and 11° I1 of the base material) Due to lack of sex, etc., the 11th grade of the 19th grade material is produced, which is an obstacle to practical application. j (= while trying to decide + l'j'1
Point] The inventors of the present invention noticed that the temperature around the intake valve was relatively low.1. F)1. The object of the present invention is to provide a valve sorting ring-less alloy cylinder head which is M-shaped and whose surface area in contact with the valve is coated with a wear-resistant material, and which does not cause problems such as peeling off of the coating layer P1. .

[Means for solving problems]

The present inventors made the intake valve seat equivalent part of the cylinder head made of M alloy or dovetail metal into a fiber-reinforced metal (FRM) with metal fibers, and used M alloy or Mg alloy as a base material for the valve seat RQi part to provide wear resistance. The reinforcing metal fibers used in the present invention are 315 and 845. SCC2O45 (J440%S
Steel and iron-based fibers such as UB 410 or alloy fibers such as Ni-based, Co-based, Ti-based, Cu-based, etc. are preferred. And these are long n1. If it is a fiber, the wire diameter is 10 to 300 μm, short f#! If it is a fiber, it is preferably 20 to 20 μm in diameter and 10 to 500 μm in length, and preferably contained in a volume percentage of 5.0 to 40%. Among the metal fa fibers, the above-mentioned iron-based and alloy-based fibers are preferable because they have a superior wetting ratio with the matrix metal compared to ceramic lJ2<44), and
This is because it is also cheap, and although its strength properties are inferior to those of ceramic fibers, they can be of practical use. If the length, size, volume ratio, etc. of reinforced #i fibers are within the above limited range, then F
If the RM is poorly formed or the metal fibers are peeled off,
It does not cause problems such as insufficient strength, heat resistance, and wear resistance against the mating material.

As the light alloy for the F-M base material in this invention, those conventionally provided for this purpose can be used, and specifically, AC4C aluminum alloy, AZ91 magnenium alloy, etc. It is also possible to use materials with heat resistance, resistance, and impurity, such as ADT 4. And any special limitations regarding the combination with the above metal fibers? 'i
do not have.

Next, there are two methods for manufacturing shims for the FRM section. That is, a skeleton preform such as a molded product made of long metal fibers wound concentrically or a molded product made of metal nets laminated in a ring shape is placed in the shell-shaped valve part of the cylinder head, and the light alloy is The above preform is infiltrated by pouring molten metal and cast integrally with the cylinder head body, or gold M4 short fibers are formed into a predetermined shape using a binder and molded into 8 alloy or Mg alloy. After die-casting into a ring-shaped FRM rough material, it is placed in the shell-shaped valve seat part of the cylinder head.
It can be formed by casting into the cylinder head body.

Valve seat side Y? - The reason why the surface coating material is limited to wear-resistant material based on A6 alloy or H4G metal is because the application of the present invention is limited to the intake valve seat part on the relatively low temperature side. 1.It has inferior heat resistance properties compared to normal Fe-based materials, etc., but has higher thermal conductivity, and has the characteristics of good bonding with the base material M alloy or Mg-gold alloy RM.

[Effect]

Conventionally, it is not uncommon to abolish the seat ring in cast iron cylinder heads, but M alloy or Mt;r=#
However, there is no practical example of this with a cylinder head made of 4Mg alloy.The reason is that even at the intake valve seat on the low temperature side, the pot temperature locally becomes close to that of the exhaust. It lacks strength and high-temperature wear resistance, is susceptible to entrapment of deposits from hardened products, and lacks corrosion resistance.

This is because they have various problems. To this end, attempts have been made to apply a hard surface coating with heat resistance, abrasion resistance, etc. to the surface that comes into contact with the valve. Even so, the problem of peeling of the surface coating due to insufficient bonding with the M alloy or Mg alloy of the base base, and the thermal distortion caused by lack of rigidity or thermal expansion of the base M alloy or homogeneous alloy itself can be avoided. This was a problem and hindered its practical application.

In the present invention, the portion corresponding to the intake valve seat and the surrounding portion of the cylinder head made of M alloy or pigeonhole metal are made of metal fibers.
By making it RM, the high-temperature strength and rigidity of the contact surface base material part are increased, and thermal distortion on the same side of the valve seat due to thermal expansion is suppressed. Furthermore, the PAL 1191 stone part is made of M alloy or Mg alloy as a base material, which improves wear resistance. By covering the surface with a material, it is possible to increase the multi-joint strength, prevent peeling, and increase the degree of freedom in selecting the surface coating material.

〔Example〕

The present invention will be explained in more detail by way of examples in accordance with the drawings.

Example 1 A fiber molded body 1 shown in FIG. 1 was produced using stainless steel (SO8410) long fibers with an average wire diameter of 50 μm, and after setting it in a shell-type intake valve seat part for a cylinder head, it was coated with %M gold alloy AC4C. ) was suction-cast using molten metal, and the above valve seat part was made into a 20-inch FR of a fiber volume car.
M, and the necessary heat treatment and machining were further performed to produce a rough material for the rad assembly into the cylinder. FIG. 2 shows a cross-sectional view of the cylinder head in which the above-mentioned FRM is formed, and 2 shows the FR
M, 3 indicates the cylinder head body.

Next, on the surface of the valve seat portion that is in contact with the valve, a Co-based intermetallic compound powder Co-30!AJj-17%Si-451CuO alloy powder is used as a base material and Co-based intermetallic compound powder Co-30! J.M.O.
- After applying the mixed material paste with 2 fb of -8% Cr-2*Si, it was locally heated by a laser beam and liquid-phase sintered in a semi-molten state, and then rapidly cooled with an air blower.
Abrasion resistant coating No. 4 was formed as shown in the figure. Finally, the wear-resistant coating layer 4 was machined to form the pulp-recessed surface 5 shown in FIG. 4 to complete the cylinder head. 6 indicates cooling water.

As before, a sintered metal ring sheet was press-fitted on the exhaust side.

Implementation row 2 Using the mesh made of stainless steel long fibers of Example 1, the fifth
A fiber molded body 1' having the shape shown in the figure is molded, and a cylinder head rough material is obtained in the same manner as in Example 1. Firstly, the contact surface with the valve is coated with a wear-resistant coating similar to that in Example 1. The material is plasma sprayed to form a wear-resistant coating layer 7 shown in FIG.
A cylinder head body 3 was obtained by machining.

The wear-resistant coating layer 4 in Example 1 melts into each other at the interface with the FRM 2, whereas the wear-resistant coating rd7 in this example is a deposited layer of molten particles.

Example 3 Short 5-45 steel fibers with an average wire diameter of 10 μm and a length of 100 μm were dispersed in colloidal silica, vacuum-sucked and formed into a tafa molded body 8 shown in FIG.
The ring-shaped FRM rough material 9 as shown in FIG. 48 was obtained by die casting using ADT4). fR pheasant pot volume ratio is 20%. Next, the F-M original material 9 was set in the shell-shaped intake valve seat area for the cylinder head, and then suction cast into molten AJ alloy (AC4C) to form the above-mentioned FFLM.
There are 9 original materials and 9 metal materials.

Furthermore, the subsequent steps were carried out in accordance with Example 1 to obtain a completed cylinder head product.

Example 4' In place of the short steel fibers in Example 3, an average wire diameter of 10 was used.
An FRM rough material was manufactured using Cu-30*Sn short fibers with a length of 150 μm and a length of 150 μm, and this was set in a shell-shaped valve seat part and pressure-cast with a single-smelling alloy (AZ91) K. , Aya alloy cylinder head was obtained by casting FRM rough material. After performing the necessary heat treatment and processing, a wear-resistant coating layer was formed on the valve seat surface in the same manner as in Example 1 to obtain a completed cylinder head product.

Test Example Temperature measurements and durability evaluations were carried out for each of the valve seat portions of the cylinder heads obtained in the above examples. A comparative example was a cylinder head in which 5UH3, which is normally used for intake valve seats, was press-fitted.

The measurements were conducted under operating conditions of 5500 r, p6m x full load x 300 hours. The results are shown in the table below.

〔Effect of the invention〕

As is clear from the above description, in terms of performance, the cylinder head of the present invention has good thermal conductivity of the pulp seam (11), so the valve seat temperature decreases, and the high temperature strength of the valve seat part increases.
There is a margin in wear resistance, corrosion resistance, etc., and the wear-resistant surface coating material can be made of a lower grade and cheaper material, or it can withstand higher loads, making it easier to improve the performance of the engine.

In addition, the heat of the intake pulp is transmitted to the valve seat section, which lowers the temperature of the intake pulp, which increases the high-temperature strength, hardness, abrasion resistance, corrosion resistance, etc. of the pulp, and reduces the cost as well as the valve seat section. The pulp diameter can be designed to be narrower, leading to a significant improvement in performance.

Furthermore, since the material around the valve seat has been strengthened, the wall thickness including the valve seat can be made thinner, leading to weight reduction, and the cooling effect of the cooling water is increased, making it easier to improve performance. The extra cooling capacity has the advantage of reducing the amount of cooling water, reducing weight, and shortening warm-up time.

Next, from the Kff surface construction, the number of parts was reduced.

There are many advantages such as omitting the high-precision machining of the cylinder head prepared hole and the seat ring alone for driving the seat ring, and omitting the press-fitting process such as seat ring cold tight fitting. There is no need to worry about falling off due to defects or loosening.

When the above effects are combined, it is Kyoshi.

The present invention can be said to have developed an innovative seat ring-less light alloy cylinder head that is low cost and high performance.

A brief explanation of the front surface FIG. 1 shows a perspective view of the fiber molded article of Example 1.

Figure 2 shows a cross-sectional view of the cylinder head body with a valve seat made of FRM.

FIG. 3 shows a cross-sectional view of the pulp contact surface coated with a wear-resistant material.

FIG. 4 shows a cross-sectional view of the completed cylinder head.

FIG. 5 shows a perspective view of the fiber molded article of Example 2.

FIG. 6 shows a sectional view of a completed cylinder head according to the second embodiment.

Figure M7 shows a perspective view of the fiber molded product of Example 4, FIG. 8 shows a perspective view of the FRM raw material.

In the figure.

1.1'...Fiber molded body 2...FRM3...
・Cylinder head body 4... Wear-resistant coating layer 5...
・Pulp contact surface 6...Cooling water 7...#Abrasive coating layer 8...Fiber molded body 9...F⇠M rough body (1 other person) Fig. 1 Fig. 2 Fig. 3 Figure 4 Figure 5 Figure 6

Claims (6)

[Claims] (1) The part of the cylinder head body corresponding to the intake valve seat is made into a fiber-reinforced metal with metal fibers, and the valve contact surface is provided with a coating layer of a wear-resistant material based on Al alloy or Mg alloy. Valve seat ringless light alloy cylinder head. (2) Long metal fibers with a wire diameter of 10 to 300 μm are arranged concentrically in the fiber-reinforced metal at a volume ratio of 5.0 to 40%,
Alternatively, the light alloy cylinder head according to claim 1, wherein the cylinder head is oriented in a mesh shape. (3) In the fiber reinforced metal, a wire diameter of 2.0 to 20 μm,
Short metal fibers with a length of 10 to 500 μm have a volume ratio of 5.0
The light alloy cylinder head according to claim 1, wherein the light alloy cylinder head is composed of 40% to 40%. (4) Metal fibers are S15, S45, SCR20, SCM
The light alloy cylinder head according to claim 1, which is selected from iron-based metals such as No. 40 and SUS410, or Ni-based, Co-based, Ti-based, and Cu-based alloys. (5) The light alloy cylinder head according to claim 1, in which the fiber-reinforced metal portion is cast by an infiltration method, with a fiber skeleton preform disposed in the valve seat portion. (6) The light alloy cylinder head according to claim 1, wherein the fiber-reinforced metal is cast in the valve seat portion as a single raw material.