JPS603431A - Rotor housing of rotary piston engine - Google Patents

Abstract

PURPOSE:To realize improving the effect of lubrication for sliding face of an apex seal by providing, by means of photoetching method, a large number of oil holding concave parts with nearly letter U-shaped section on a trochoid face of a rotor housing. CONSTITUTION:Oil holding concave parts 14..., independent of each other with a nearly letter U-shaped section and also a circular opening, are engraved by means of photoetching method covering the whole trochoid face 1a of a rotor housing 1 lengthwise and crosswise at a constant pitch interval. Further, a plateau part 15 between each concave part 14 is formed to have surface roughness below 1mu. Due to this, an always stabilized oil film can be formed on the trochoid face and the effect of lubrication of an apex seal sliding face is improved so that its life can be lengthened. Further, since the section of the concave part 14 is formed nearly letter U-like, decrease of area ratio with abrasion of the trochoid face 1a is small and characteristic of initial sliding can be maintained for a long period.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotor housing that extends the life of a rotary piston engine and is also suitable for a high output rotary piston engine. 3 (Prior Art) In general, a rotary piston engine has a polygonal rotor inside a rotor housing whose inner circumferential surface is formed in a 1-rochoid shape, and an apex seal with Bt4 at the top thereof is circumferentially attached to the trochoid surface. This is a planetary rotational motion while causing the rotation. Conventionally, rotor housings with good sliding characteristics have been manufactured by applying chromium plating to the trochoidal surface of the rotor housing, for example, as disclosed in Japanese Patent Application No. 53-38698. Then, by applying reverse electric treatment to this plating layer, channel type pores of 11~ shape are engraved, or by further grinding the treated surface, bottle point 1~ type pores of the thank you note are engraved. As a result, a moderate oil film is formed on the mustocoid surface using these porously retained engine oils. It is well known to provide good lubrication with moving surfaces. Also,
Japanese Patent Publication No. 52-28922-C discloses that a bottle point type porous is engraved on the rotor housing trochoid surface, and the area ratio, that is, the total opening area of all the pores is 1119 in terms of the total area of the trochoid, within a specific range. A rotor housing has been proposed in which the lubrication effect is enhanced by providing sufficient hose holding suspension by limiting the number of hoses (7) to 71.

In this case, if the amount of oil held in the porous material is further increased, it is possible to form a stable oil under various usage conditions, which further enhances the above-mentioned lubrication effect, and reduces the sliding of the rotor housing. If the characteristics can be improved, the characteristics can be maintained for a long period of time. In particular, this means that the average effective pressure is increased by equipment such as a turbocharger, or the maximum in-cylinder pressure is increased by improved combustion, which raises the blood pressure on the apex seal sliding surface by mV and increases the heat load. The sliding speed of the apex seal sliding surface increases due to the engine and the maximum rotational speed being set high.In the lζ engine, it is possible to prevent the generation and covering of titter marks on the rotor housing 1 to the lochoid surface, and to prevent trochoid mI glue [ This is advantageous in increasing the reliability of these high-output engines, since abnormal wear of the 1mm plating layer and the avex wheel can be suppressed.

Therefore, it is possible to increase the amount of oil retained by increasing the depth of the porous carving. However, in this case, if the amount of reverse electrolysis is increased to increase the carving depth, As shown in the figure (magnification: 400x), the surface roughness of the platelet between the porous 8 is promoted and its surface roughness increases, which increases the wear amount of the apex seal and its sliding resistance. There is a problem that the output decreases due to the increase in cass sealing performance and the deterioration of the cassealing property.1 Moreover, in the case of channel type porous, the Ii surface shape is formed into a tight V-shape due to cracking due to internal stress. is,
On the other hand, in the case of the bottle point type, the chrome plating layer is destroyed by the grinding process. At the same time, in order to expand the frontage, the cross-sectional shape is formed into a V-shape. For this reason, the area ratio of all types of pores rapidly decreases as the rotor housing trochoidal surface wears, and the volume of the pores decreases, resulting in a rapid decrease in oil retention and the initial sliding characteristics. J#J Ii! ] The problem arises that it is not possible to maintain the In addition, the shape of a part of the plate is not constant depending on the chromium plating processing conditions (hardness, thickness, internal stress), and the degree of porousness varies depending on the grinding conditions when forming the pinpoint l-. Because the pores cannot be formed in a uniform manner and the distribution of pores is irregular, welding and abrasion occur in areas where the pores are carved in shallow depths, areas with a low area ratio, and areas where the distribution of pores is sparse. It also has the problem of generating tar marks.

Furthermore, in order to give long-term oil retention ability to the reverse τR porous chrome plating method, if we try to increase the area ratio of the four parts to 1q, we will have to significantly reduce the area ratio of some parts of the original brush 1. It's profitable (naru. First of all bra h
Some parts are in sliding contact with piston rings, piston skirts, etc. under high pressure, so lowering the blood pressure per unit area is important for improving wear resistance and scuffing resistance. The larger the area ratio is, the more desirable it is.

Furthermore, from the standpoint of ensuring good sealing properties, it is better not only to have four oil-retaining parts but also to have no surface irregularities.

For this reason, just because oil retention is necessary, it is not enough to simply increase the area ratio of the four parts; there is naturally a limit to the area ratio of the four parts, and this is even more so in high-speed, high-negative engines.

What is desired from these points is to maintain the concave shape (11") that does not reduce the area ratio of the four oil holding parts that was originally set even if the wear reaches 31Lf. If this is possible, This means that it can satisfy the contradictory properties of strength, durability, and lubricity.

On the other hand, the foot etching method is known as a processing method for carving various shapes of recesses and opening holes on metal surfaces.
For example, it is applied to the processing of electric razor blades, color television shadow masks, and spherical bearings.

(Object 1 of the Invention) As described above, an object of the present invention is to prolong the life of a rotary piston engine and to provide a rotor housing suitable for a high-output rotary piston engine. The purpose of this invention is to enhance the lubrication effect between the apex seal 1 and the moving surface by using a simple configuration using the etching method, improve the sliding characteristics of the rotor housing, and suppress wear of the apex seal.

(The structure of the present invention) In order to achieve the above-mentioned object, the solution means of the present invention is applied to the trochoidal surface of the rotor housing of the rotor piston engine by the foot etching method.
It is characterized in that it has a large number of 7-shaped oil retaining recesses and that the surface roughness of the roughness between the recesses is 1 μ or less.

Regarding this, in the present invention, the depth of the oil retaining recess is increased by adjusting the photoetching processing conditions to increase the amount of mail retained, and the U-shaped cross-sectional shape increases the trochoidal surface. The reduction in the opening area of the oil holding recess due to wear is minimized, and the four oil holding parts are reduced to 1.
~ It is a mark that is regularly engraved without variation on the muscoid surface, and also has a mirror finish on a part of the plato to alleviate friction with the apex seal.

In this case, the above four oil holding parts are 1i'+ : □1
4 Set Cl0 = 60% and set the depth to 5~5
Setting 0 μ to cover 1~ forms a sufficient oil film on the stucoid surface, secures the strength of the plateau part of the peripheral edge of the oil retaining recess, and prevents wear and peeling of the llocoid surface 1] sticky layer. It is advantageous because it can be done.

(Effect of invention) Therefore, tree J? According to the method, a large number of four oil retaining parts with approximately U-shaped cross-sections are formed on the rotor housing's musculoid surface using the soil tsubung method, and the surface roughness of the plateau part is made to be 1μ or less. With the simple configuration of 1~1''], the area ratio of the bra 1~ part on the side surface and the size and strength of the individual brato parts are sufficiently ensured, while at the same time increasing the amount of mail held by the four oil holding parts. In addition to forming a stable oil film on the trochoid surface, it also reduces the reduction in the amount of mail retained due to wear on the trochoid surface, makes the distribution of the oil film uniform, and suppresses the wear of the apex seal. It is possible to improve the sliding characteristics a5 and to suppress wear of the apex seal. This has the excellent effect of not only prolonging the life of general U-cripiston engines but also improving the reliability of high-output low-cripiston engines. . 1h, the oil holding recesses are set at an area ratio of 10-60% and the depth is set at 5-50 μm.This ensures the strength of the peripheral edges of the four oil holding parts and prevents wear and peeling of the chrome plating layer. It is possible to prevent this and further enhance the above effects while maintaining 4T.

(Example) Hereinafter, an example as a concrete example of the technical means of the present invention will be described based on the drawings.

1 to 3 show one embodiment of this invention. In FIG. 1, Δ is the rotary piston's carrot, and the l-[]1 cylindrical inner circumferential surface 1a on which a chromium plating layer is formed.
A polygonal rotor 4 is moved at a planetary rotational speed of 1.0 through a casing 3, which is composed of a rotor housing 1 with a right side and side housing sinks 2, 2, which are arranged on both sides of the rotor housing 1 and are integrally fixed thereto. IJ L/, 33' working chambers 5. defined in the casing 3 by the rotation of the 1 coil 94; ．． 5.5, each stroke of intake, compression, explosion, expansion J3, and exhaust is performed in order. The above 1-0 is attached to each top of the rotor 4.
An apex seal 6 is attached to the 171 surface 1a4 to keep the actuator 95 airtight by slidingly contacting the surface 1a4. Note that 7 is an eccentric shaft that supports the rotor 4, and 8 is a lead seal that is placed on the side surface of the rotor 4 and slides into contact with the lead housing 2 to keep the working chamber 5 airtight. In addition, 9 is a corner seal installed on both sides of the top of (]-4, 10d5 and '11 are spark plugs on the trailing side J3 and leap side, respectively, and 12 is an intake bow 1~.13 is a II port.

1 to 1a of the rotor housing 1 are filled with FJ.
l-: L, as shown in Figures 2 and 3 (100x magnification) using the Tuchink method, the cross-sectional shape is approximately U-shaped and circular, and is independent of each other. Four oil retaining portions 14 are carved at equal pitches in the vertical and horizontal directions over the entire surface of the trochoid surface 1a. Further, the plateau portions 15 between the respective recesses 14 are formed to have a surface roughness of 1 μm or less.

To explain the method of forming the oil retaining recess 14 by the above-described etching method, as shown in FIG.
First, an enlarged original drawing of the oil holding recess 14 is prepared, and this is reduced by a shadow 17 and arranged on a sheet as a transparent part at a predetermined pitch in the vertical and horizontal directions, thereby forming a negative film-like photomask. Create. Next, a UV-sensitive film is pasted on the trochoid surface 1a that has been cleaned with an organic solvent using a film pasting D-ru;
The photomask is placed on top of the film in close contact.

In this state, the surface of the photomask is exposed to ultraviolet light to photocure the portion of the film corresponding to the light-transmitting portion (corresponding to areas other than the 71-il holding recess 14). and,
The photomask is removed and the film is developed to dissolve and remove the cured portion (unexposed portion) to form a mask on the mucoid surfaces 1 to 1a. Next, apply a Tubung process to the coid surface 1a, and tlR the part not covered with the mask (corresponding to the oil holding recess 14...) to form the oil holding recess 14... After engraving, remove the mask and complete the work. In addition, in the embodiment described in -,
Purple Taro ≦ (I used a photosensitive film, but the trochoid surface 1
A photoresist (photosensitive agent) may be applied to a and dried and hardened to form a photoresist film.

Furthermore, the area ratio of the oil holding recesses 14, that is, the value obtained by dividing the total area of all the oil holding recesses 14 by the total area of the inner surface 1a, is set to 10 to 60%. In addition, the depth is set to 5 to 50μ.

Next, to explain the above-mentioned limitation, the reason why the tree top rate is limited is that if it is less than 10%, the oil holding recess 14 will not be able to hold enough oil, so a sufficient oil film cannot be formed on the trochoid surface 1a. On the other hand, if it exceeds 60%, the thickness of the inner part 1 to the part 15 becomes thinner, and the pressing force of the apex seal 6 causes deformation and destruction of the oil retaining recess 14, resulting in an abrasive wear state. This is because the wear of the chromium plating layer on the trochoid surface 1a and the apex seal 6 increases. In addition, the depth is limited to less than 5 μm when the oil retention recess 14 has an oil retention n.
) is insufficient, and on the other hand, if it exceeds 50μ, the pressure of the apex seal 6 will cause the oil retention recess 14 to
When deformation and destruction occur, cracks propagate toward the base of the plated layer, and these cracks heal and burn! 3
The plating layer may peel off due to penetration of the Z product and corrosion of the base. Particularly, this peeling of the plating layer occurs when the depth of the oil holding recess 14 exceeds half the thickness of the plating layer.

Therefore, in the above embodiment, since a large number of oil holding recesses 14 were formed on the 1-lochoid surface 1a of the rotor housing 1 by the photo-edging method, the recesses 14 were formed by adjusting the etching strip (!1) as appropriate. ... can be deepened, and its oil retention capacity can be increased.As a result, a stable oil film can always be formed on the 1-1]21-id surface 1a, and the sliding surface of the Abe-Nx seal 6 can be increased. The aVJ sliding effect of the motor housing 1 can be made excellent.As a result, in a general rotary piston engine,
In addition, in high-output [1-Crypiston] engines, the contact pressure of the apex seal 6, the increase in heat and heat, and the
The reliability can be improved by preventing the occurrence of chatter marks due to increased sliding speed, abnormal wear of the chromium plating layer on the trochoid surface, or abnormal wear of the apex seal.

Furthermore, since the oil retaining recess 14 is formed in a substantially 1"-shaped cross-sectional shape, the area ratio decreases due to wear of I11' of the 1-loid surface 1a compared to the conventional V-shaped porous. C
Since the volume of the recess 14 (for oil retention) can be suppressed from decreasing by decreasing to large rlJ, the initial sliding characteristics can be maintained for a long period of time, and as a result, []-
The life of the Talypiston engine can be further extended.

Further, the oil holding recesses 14 are arranged on the photomask with high precision at predetermined pitch intervals according to the same original drawing, and are carved on the muscoid surfaces 1 to 1a following the transparent parts. C., when the opening area and depth of each time ar+ 14 are aligned, concavities n1114... can be regularly distributed, thereby forming on the musculoid surfaces 1 to 1a. By making the distribution of the oil film uniform, it is possible to prevent jitter marks from occurring locally.

In addition, during etching, the part covered by the mask (the part that will be formed on the brush 15 after the work) is not etched and left as a mirror surface with a surface roughness of less than 1 μm, so the apex seal 6 The second step is to suppress wear on the moving surfaces! 78 resistance can be reduced, and the cassealing performance can be improved to prevent a decrease in output.

In addition, since the 7711-etching method is used, the IC does not generate processing heat unlike conventional honing, and the lochoid surface 1a will not be deformed, altered, or double-hardened, making it an excellent tool for quality control. It is.

Moreover, since photomasks with various patterns can be freely produced, there is an advantage that the shape and distribution of the A-il holding recesses 14 can be arbitrarily selected.

Incidentally, the four oil retaining portions 14 are
It may be engraved only on a part of it. In that case, the area ratio is 1ti1. ．． I] is the value obtained by dividing the product by the total area of the portions 1 to 18 of the musculoid surface where the recessed portion 14 is engraved.

Furthermore, the opening area or depth of each recess 14 may be changed depending on the engraved portion.++'J''+hThe generation of chatter marks is mainly suppressed by increasing the area ratio of the recess 14, On the other hand, I~locoid surface 1a
The wear of the chrome plating layer and the apex seal 6 is caused by the recess 1.
It has been experimentally confirmed that this can be prevented by increasing the area ratio of 4 and increasing its depth. Therefore, for example, the trochoid surface 1 of the trochoid surface 1 near the long axis (area 71 in Figure 1) where chatter marks are likely to occur.
In a, the area ratio of the A-ile holding recess 14 is increased, and on the other hand,
1 to the railing side of the trailing side spark plug 10 where the amount of wear of the chrome plating layer is relatively large (72 in Fig. 1)
area> 1 [1 There is an oil holding recess 14 on the coid surface 1a.
It may be carved so that the area; r is small and the depth is deep.

Next, a specific example will be explained. The present invention is made by carving oil retaining recesses as shown in Table 1 below in the aluminum alloy housing, which is made of a steel plate cast in aluminum alloy and has a chromium plating layer formed on the locoid. Example) and type porous is engraved on pin point I, and lJ type (conventional example) is installed in the engine / υ is subjected to durability test 1, The layer wear m and the apex seal wear state were measured. The example of the present invention is similar to the above example (a circular 17 (17) having 10 states (NO
In addition to 1 to 9), as shown in Fig. 5, there are crosshatched grooves in which the grooves intersect in an X-shape at an angle of 1 cI (120°) along the direction of the oscillation (arrow direction) (No. 5', 7').
I thought tulJ. The results are not shown in Table 1.

The rotary piston engine used in the above-mentioned Endurance Bust has a displacement of 1,300 cc, is equipped with a peripheral boat, and uses a fuel injection system to generate a maximum output of 280 PS at a maximum rotational speed of 900 Orpm. The test was carried out by continuous operation for 100 hours under these conditions. Also, the apex seal is shown in Table 2 below. 1 composition, containing 50 to 70% by volume of carbide, and lI3! ! Degree is Hv700～
900 made of chilled cast iron was used.

Table 2 In addition, in the photo-setting, a square resist with a thickness of 8 .mu.m was used as the ultraviolet-sensitive film, and exposure was carried out for 5 minutes using a high-pressure mercury lamp equipped with a 1 .mu.w lamp with a light emitting section length of 20 cm. And development is 1.1.11-
The etching solution was Cr 20s (25
01/U ) and 112SOa (2,5'S?'/j!
) was used.

In addition, the depth of the oil holding recess and the amount of wear of the chrome plating layer are the maximum values, and the depth of the 1r mark is the same as the above 71.
The wear amount of the chrome plating layer was measured in the Z2 area. In these areas, when the remaining thickness of the chromium plating layer is 30 μm or less and the plating layer is peeled off and the base is exposed, it is described as ``exposed base''.

According to Table 1 above, in the conventional example, the base is exposed or a chittle mark in a state close to this occurs in a short period of time, the base is exposed, the layer is rounded, and the apex seal is damaged. It is occurring. On the other hand, in the example of the present invention, the area ratio is outside the range of 10 to 60%, such as NOl and 2.9. However, the area ratio and depth of the four oil retaining parts are within the specified range (each 10 ~60%, 5~50μ)
NO, 3 to 8.5', 7') all have good lubrication effects, no jitter marks occur, the amount of wear on the chrome plating layer and the apex seal is slight, and the output is also low. It is clear that there is no CO.

Incidentally, a microscopic photograph of the muscoid surface of Example No. 7 of the present invention in Table 1, enlarged 50 times, is not shown in FIG. In this photograph, it can be seen that the oil holding recesses are regularly engraved with the same shape, and a portion of the plate is formed into a mirror surface.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, FIG. 1 is a longitudinal sectional view of a rotary piston engine, FIG. 2 is a perspective view of the rotor housing, and FIG. 3 is taken along the l-n1 line in FIG. 2. An enlarged cross-sectional view, Fig. 4 shows the process of forming the oil retaining recess by photo-etching. Figure 8 shows the metal structure of the helicoid surface of Example 1 of the present invention under a microscope.・Rotary piston engine, 1... Data housing, 1a... Top face coil, 4... Rotor, 6゛°° apex seal, 14... Oil holding recess, 15... Ara 1-part.

Claims (2)

[Claims] (1) In a rotary piston engine comprising a Nospex seal in contact with the trochoidal surface of the rotor housing at the top of the rotor that rotates planetarily within the rotor housing, the trochoidal surface of the rotor housing is coated with the photoedzileg method. A rotor for a rotary piston engine, characterized in that it has a large number of four oil retaining parts each having a substantially U-shaped cross-sectional shape, and has a surface roughness of 1 to 1 μm or more between each part. housing. (2) When the four oil retaining parts have an area ratio of 10 to 60% and a depth of 5 to 50 [mu] [The rotor housing of a rotary piston engine according to claim (1)].