JPS6147969B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotor for a rotary piston engine.

(Prior Art) Generally, as shown in FIG. 1, a rotary piston engine is generally formed of a rotor housing 1 having a trochoidal inner circumferential surface and side housings 2 disposed on both sides of the rotor housing 1 and integrally fixed thereto. A polygonal rotor 4 makes planetary rotational motion in a space 3 in which an apex seal 5 attached to the top of the rotor 4 is brought into sliding contact with the inner circumferential surface of the rotor housing 1.
The space 3 is divided into three working chambers by the rotation of the rotor 4, and the suction, compression, explosion, expansion, and exhaust strokes are performed in sequence. In FIG. 1, 6 is a combustion chamber recessed in the flank surface 4a of the rotor 4, 7 is a side seal attached to the side surface 4b of the rotor 4, and 8 is the rotor 4.
9 is a spark plug, 10 is an intake port, and 11 is an exhaust port.

In this way, the rotary piston engine is structurally flat and has a combustion chamber that is long in the rotor rotation direction, and especially on the lag side (trailing side) in the rotor rotation direction, the rotor 4 is connected to the flank surface 4a of the rotor 4 as shown in FIG. The gap with the housing 1 becomes narrower, and a narrow gap (usually called a ΔF section) is formed. This △F part has a small gas flow and is cooled from both walls of the rotor housing 1 and rotor 4, making it difficult for the temperature to rise. Therefore, the flame is difficult to propagate, and unburnt gas is likely to be generated, resulting in HC in the exhaust gas.
(hereinafter referred to as RawHC) component.

(Problems to be Solved by the Invention) By the way, it is possible to coat the rotor flank surface in the △F section, that is, the rotor surface on the lagging side in the rotational direction of the rotor between the combustion chamber and the apex seal groove. By making the clearance of the ΔF portion as small as possible, RawHC can be reduced.

However, in this case, the coating material for the rotor flank surface is required to not impede engine performance in any way. In other words, the physical properties and matters necessary for the above-mentioned rotor flank surface coating material are: (a) Approximately 200
It has heat resistance that does not deteriorate at °C, (b) it does not peel off due to instantaneous impact with the rotor housing, and (c) it does not damage the inner peripheral surface of the rotor housing (Cr plating) and has cushioning properties. (d) It does not cause engine braking, (e) It has sufficient adhesion to the rotor, and (f) It is easy to control the layer thickness.

However, conventionally, as a technology for providing a coating layer on the rotor of a rotary piston engine,
These include Publication No. 49528 and Special Publication No. 49-47207. Among these, the one disclosed in JP-A-55-49528 uses a soft material such as a soft metal (aluminum, nickel aluminide, etc.) or plastic (fluororesin, etc.) on the trailing side of the rotor to prevent the knocking phenomenon. It is coated by thermal spraying, plating, coating, etc. In addition, special public service in 1977-
In the No. 47207 publication, in order to prevent combustion gas from entering the intake working chamber, a soft coating layer is applied to the leading side of the rotor by thermal spraying with a soft metal or by coating with plastic (polyamide resin, phenol resin, etc.). It was established. but,
These soft materials have insufficient adhesion to the rotor, and may peel off when subjected to instantaneous impact force.They also have insufficient cushioning properties, which may damage the inner surface of the rotor housing or cause damage to the engine braking effect. This can cause damage, especially to metal covering materials. In addition, since the coating layer is formed by metal spraying, plating, or plastic coating, productivity is poor and the layer thickness is not easy to control, resulting in variations in layer thickness. The original purpose cannot be achieved, and if it is too thick, problems such as contact with the rotor housing will occur.

The present invention has been made in view of these points, and is designed to satisfy the physical properties and matters required for the rotor flank surface coating material described above, and to effectively reduce RawHC without affecting engine performance. The purpose is to

(Means for solving the problem) In order to achieve the above object, the solution of the present invention consists of three layers: a surface layer of epoxy resin having holes, an intermediate layer of fibrous material, and an adhesive layer of epoxy resin. A coating layer is provided by adhering and baking the laminated sheet to the surface of the rotor on the lagging side of the rotor rotational direction between the combustion chamber and the apex seal groove.

(Function) With the above configuration, in the present invention, the epoxy resin surface layer having pores in the coating layer has physical properties (a) to
It sufficiently possesses the properties (c) (i.e., heat resistance, peeling resistance, non-injury to other materials, and cushioning properties), and the fibrous intermediate layer not only functions as an aggregate but also improves the cushioning properties. Further, the epoxy resin adhesive layer naturally has sufficient adhesion to the rotor (property (e)). In addition, the coating layer is made by gluing and baking laminated sheets, and the layer thickness can be easily controlled to a predetermined value (about 300μ) (item (f)). Since the machining tolerance is 0.5±0.2mm, it possesses property (d) (does not cause engine braking), and therefore possesses all the necessary physical properties and matters as a coating material for the rotor flank surface. I will do it.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. Incidentally, since the structure of the rotary piston engine has already been described with reference to FIG. 1, detailed explanation thereof will be omitted.

In FIGS. 1 to 3, 12 is the rotor 4.
A coating layer provided on the lagging side in the rotor rotational direction A of the flank surface 4a between the combustion chamber 6 and the apex seal groove 13, the coating layer 12
As shown in enlarged detail in Fig. 3, the pores 14 are made of a solvent-type two-component epoxy resin that has a heat resistance of about 200°C and contains an amine-based curing agent and a solvent such as toluene or acetone. A surface layer 15 of epoxy resin having the following properties, and an intermediate layer 16 of fibrous material such as rayon fiber or carbon fiber, and a heat-softening liquid epoxy resin or room-temperature adhesive that cannot be bonded at room temperature but softens and becomes bondable when heated. A laminated sheet consisting of three layers, including an epoxy resin adhesive layer 17 made of an adhesive liquid epoxy resin having a viscosity, is formed by bonding the epoxy resin adhesive layer 17 to the rotor flank surface 4a and heating and curing it to form a laminated sheet. The thickness is set to approximately 300μ.

Of the above-mentioned coating layer 12, the epoxy resin surface layer 15 having pores 14 has the properties (a) to (c) among the physical properties necessary for the rotor flank surface coating material (i.e., heat resistance, peeling resistance, not to hurt the
In addition, the fibrous intermediate layer 16 functions as an aggregate and improves the cushioning property.Furthermore, the epoxy resin adhesive layer 17 naturally has a sufficient buffering property. It has sufficient adhesion (property (e)). In addition, since the covering layer 12 is formed by bonding and baking laminated sheets, its productivity is good, and the layer thickness can be easily controlled to a predetermined value (item (f)). By setting the thickness to about 300μ, the machining tolerance of the above △F section is 0.5±0.2mm, so it maintains property (d) (no engine braking), and therefore, it is suitable for use as a coating for the rotor flank surface. It possesses all of the physical properties and items (a) to (f) necessary for a material.

Next, an example of a method for forming the coating layer 12 will be described. First, approximately 50 to 100 μm of a two-component epoxy resin mixed with an acetone curing agent and a solvent such as toluene is applied onto a release paper. On top of that, place a nonwoven fabric made of rayon or carbon fiber, etc. with a thickness of about 100 to 150μ, and heat it to 80 to 120℃.
By drying for 30 minutes, an epoxy resin surface layer 15 and a fibrous intermediate layer 16 having pores 14 due to solvent explosion are formed. Next, approximately 80μ of the same two-part epoxy resin as above is applied to the other surface (upper surface) of the nonwoven fabric, and after drying in the same manner as above to form a two-part epoxy resin layer, the two-part epoxy resin is Approximately 20μ of an adhesive or heat-softening one-component epoxy resin is applied onto the resin layer to form an epoxy resin adhesive layer 17, thereby forming a release paper, an epoxy resin surface layer 15, a fibrous intermediate layer 16, and an epoxy resin adhesive. A laminated sheet in which layers 17 are sequentially laminated is obtained. Thereafter, after peeling off the release paper from the laminated sheet, the epoxy resin adhesive layer 17 is applied to a predetermined location on the rotor flank surface 4a (on the lagging side in the rotor rotational direction A, between the combustion chamber 6 and the apex seal groove 13). (rotor 4 surface part) and glue it together, then
By heating the epoxy resin at 180° C. for 30 minutes to harden the epoxy resin, the coating layer 12 having the epoxy resin surface layer 15 as the surface is formed by baking, and the desired rotor is obtained.

Next, the rotor obtained in this way is
A 1200c.c. two-rotor rotary piston engine was used to measure the emissions of unburned HC components by operating the engine at low speed conditions of 1500rpm and mean effective pressure Pe3Kg/ ^cm2 . As a result, the RawHC was 10-12 compared to the conventional one without a coating layer.
% reduction was obtained. Also,
It was found that there was no problem with engine performance even during long-term operation, and that the engine had sufficient durability.

(Effects of the Invention) As described above, according to the rotor of the rotary piston engine of the present invention, holes are formed in the rotor surface portion on the lag side in the rotational direction of the rotor and between the combustion chamber and the apex seal groove. By providing a coating layer formed by adhering and baking a laminated sheet consisting of three layers: a surface layer of epoxy resin, an intermediate layer of fiber material, and an adhesive layer of epoxy resin, the coating layer becomes a rotor flank surface coating material. It possesses all the physical properties and matters necessary for rotary piston engines, does not affect engine performance, has good productivity, and is easy to control layer thickness, so it can be used in the rotor of a rotary piston engine. As a matter of convenience, △F
It is possible to reduce RawHC (10 to 12% reduction) by reducing the clearance between the parts.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention; FIG. 1 is a vertical sectional side view showing a schematic structure of a rotary piston engine, FIG. 2 is a perspective view of the rotor, and FIG. 3 is an enlarged sectional view taken along the line - in FIG. 2. It is. 4...Rotor, 4a...Flank surface, 6...Combustion chamber, 12...Coating layer, 13...Apex seal groove, 14...Void, 15...Epoxy resin surface layer, 16...Fibre material intermediate Layer 17...Epoxy resin adhesive layer.

Claims (1)

[Claims] 1. In a rotor of a rotary piston engine that rotates planetarily in a space formed by a rotor housing and a side housing, an empty space is provided on the rotor surface between the combustion chamber and the apex seal groove on the lagging side in the rotational direction of the rotor. A rotor for a rotary piston engine, characterized in that a coating layer is provided by adhering and baking a laminated sheet consisting of three layers: a surface layer of epoxy resin having holes, an intermediate layer of fibrous material, and an adhesive layer of epoxy resin.