JPH06591Y2 - Rotor of rotary piston engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to improvement of a rotor of a rotary piston engine.

[Prior Art] A rotary piston engine in which each of the intake, compression, combustion, and exhaust strokes is continuously repeated by the rotor rotating around an eccentric shaft while slidingly contacting the trochoid inner peripheral surface is well known in the art. As described above, since the combustion chamber is formed between the recess (rotary recess) formed in the flank forming the outer peripheral surface of the rotor and the inner peripheral surface of the trochoid, the combustion heat in the combustion stroke is directly applied to the rotor. As a result, the rotor during the engine operation is exposed to a considerably high temperature.

Therefore, it has been attempted to effectively cool the rotor by forming the rotor in a hollow shape inside to reduce its weight and injecting lubricating oil into the hollow inside. In this case, in order to compensate for the lack of strength and rigidity of the rotor due to the hollow interior, ribs are provided to connect the rotor boss fitted to the eccentric shaft and the inner peripheral portion of the rotor.

By the way, as described above, while the engine is in operation, the outer surface of the rotor is heated mainly by the combustion heat transmitted from the combustion chamber side, while the inside is cooled by the lubricating oil. Therefore, the outer peripheral portions such as the rotor flank surface and the rotor land located outside are heated to a high temperature, and the rotor boss located inside is maintained at a relatively low temperature. A large thermal gradient occurs in. For this reason, thermal stress is generated in the ribs, and particularly large thermal stress in the tensile and torsional directions is generated in the portion connecting the rotor boss and the rotor land.

A trochoidal phase gear (internal gear) that meshes with a fixed external gear (stationary gear) fixed to the side housing is attached to the rotor. The internal gear is attached to the inner diameter portion of the rotor land on one side by using a spring pin (gear pin).

A gear pin boss portion is provided on the internal gear mounting portion side of the rotor boss in order to fit the gear pin. Therefore, the rib is advantageous in strength on the internal gear mounting portion side. . Therefore, the thermal stress generated at the portion of the rib connecting the rotor boss and the rotor land becomes large especially on the side opposite to the stationary gear mounting portion.

On the other hand, in order to further reduce the weight of the rotor in response to the demand for weight reduction of the engine, the material is changed from the conventional cast iron type to a lighter weight, for example, a light alloy such as an aluminum alloy. Can be considered.

[Problems to be solved by the invention] However, as is well known, since light alloys such as aluminum alloys are inferior in mechanical strength such as tensile strength to cast iron-based materials, the rotor material is made of conventional cast iron. When the type is changed to a light alloy, the strength of the ribs is also reduced, and as a result, the thermal stress generated in the ribs due to the temperature rise during operation causes the ribs to connect the rotor boss and rotor land, especially the reaction A crack occurs in the above-mentioned part on the internal gear mounting side,
Therefore, the rigidity of the rotor cannot be maintained, and there is a problem in that the rotor sticks to the casing (side housing or intermediate housing).

To cope with this problem, it is conceivable to reinforce the above-mentioned part of the rib by casting a metal member having high strength such as a steel plate at the time of rotor casting, but in this case, use a light alloy for the rotor material. The effect of weight reduction due to the change is reduced, and the plate-shaped reinforcing material has a reinforcing effect with respect to thermal stress in the torsional direction, but has a low reinforcing effect with respect to the tensile direction.

[Object of the Invention] The present invention has been made in view of the above problems, and in a rotor of a rotary piston engine, without reducing the effect of weight reduction due to the use of a light alloy rotor material, the rib anti-interaction By reinforcing the part that connects the rotor boss and the rotor land on the side of the null gear attachment,
The purpose is to suppress the occurrence of cracks in the ribs and prevent sticking of the rotor to the casing.

[Means for Solving the Problems] Therefore, according to the present invention, a plurality of ribs for connecting the inner peripheral portion of the rotor formed in the inner hollow shape and the rotor boss are provided, and the inner diameter portion of the rotor land on one side is provided. In a rotor of a rotary piston engine having an internal gear attached, a portion of the rib connecting the rotor boss to the rotor boss on the side opposite to the internal gear attachment portion is formed into a substantially L-shape using a high-strength fiber material. By arranging a reinforcing material, the above-mentioned site is compounded.

[Effect of the Invention] According to the present invention, the rotor boss and the rotor land on the side opposite to the internal gear mounting portion of the rib that connects the inner peripheral portion of the rotor and the rotor boss, which is a portion to which a large thermal stress is applied during operation, are connected. Since the parts to be joined are made into a composite by using a relatively lightweight high-strength fiber material formed in a substantially L-shape, the effect of weight reduction by using a light alloy for the rotor is not reduced, and the engine is It is possible to suppress the occurrence of cracks in the ribs due to the thermal stress generated by the operation of the above, and to prevent the rotor from sticking to the casing.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a rotor 1 of a rotary piston engine according to an embodiment of the present invention is made of a light alloy such as an aluminum alloy, and has a rotor boss 2 fitted and supported on an eccentric shaft (not shown), The rotor 1 includes left and right rotor lands 3 and 4 which slide with respect to casings (not shown) arranged on both left and right sides of the rotor 1, and a rotor housing (not shown in the drawing) is provided between the left and right rotor lands 3 and 4. ), The rotor flank surface 5 is formed in sliding contact with the inner peripheral surface. Side seal grooves 12 and 13 are provided on the surfaces of the rotor lands 3 and 4, respectively, and a combustion chamber is formed on the rotor flank surface 5 with an inner peripheral surface of a rotor housing (not shown). A rotary recess 6 is provided.

An internal gear 7 is attached to one side of the left and right rotor lands 3 and 4, for example, the inner diameter portion of the left rotor land 3. The internal gear 7 is composed of a plurality of spring pins 8 (hereinafter referred to as "gapings") to form the rotor land 3
The gap pin 8 is attached to the inner diameter portion of the rotor, and the gap pin 8 is fitted in a pin hole formed in the gap pin boss portion 2 a provided on the rotor boss 2.

In addition, in order to make up for the lack of strength and rigidity of the rotor 1 due to hollowing of the central portion, the space formed between the rotor boss 2, the left and right rotor lands 3 and 4 and the inner peripheral portions of the rotor flanks 5, Rotorland 3,4 and rotor flank 5
A plurality of ribs 9 are provided to connect the inner peripheral portion of the rotor boss 2 to the rotor boss 2.

In the rib 9 of the rotor 1 according to the present embodiment, a high-strength fiber material such as ceramic fiber, glass fiber or carbon fiber is used in a portion connecting the rotor boss 2 and the rotor land 4 on the side opposite to the internal gear mounting portion. A reinforcing member 11 formed in a substantially L shape is provided. When the rotor 1 is cast, the reinforcing material 11 is disposed at a predetermined portion by being supported by a shell core and surrounding the casting.

As described above, according to the present embodiment, the rotor land, which is a portion to which a large thermal stress is applied during engine operation,
A comparatively lightweight high-strength fiber is provided at a portion connecting the rotor boss 2 and the rotor land 4 on the side opposite to the internal gear mounting portion of the rib 9 connecting the inner peripheral portions of the rotor flanks 3 and 4 and the rotor boss 2. Since the reinforcing member 11 formed in a substantially L-shape using a material is disposed around the casting to reinforce the above-mentioned portion, the effect of weight reduction due to the light alloy of the rotor 1 is reduced. Therefore, it is possible to suppress the occurrence of cracks in the ribs 9 due to the thermal stress that accompanies the operation of the engine, and prevent the rotor 1 from sticking to the casing (not shown).

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a rotor of a rotary piston engine according to an embodiment of the present invention, and FIG. 2 is an enlarged front view of a part of the rotor to show an essential part of the present invention. 1 ... rotor, 2 ... rotor boss, 3, 4 ... rotor land, 7
... internal gear, 9 ... ribs, 11 ... reinforcing material.

Claims (1)

[Scope of utility model registration request] 1. A plurality of ribs for connecting an inner peripheral portion of a rotor formed in an inner hollow shape and a rotor boss are provided,
In the rotor of the rotary piston engine in which the internal gear is attached to the inner diameter portion of the rotor land on one side, a high-strength fiber material is used for the portion connecting the rotor boss and the rotor land on the anti-internal gear attachment portion side of the rib. By arranging the reinforcing material formed in a substantially L shape,
A rotor for a rotary piston engine, characterized in that the above parts are combined.