JPH0670362B2 - Rotary piston engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a rotary piston type engine generally used as a compressor, an internal combustion engine or the like.

[Prior art]

The rotary piston type engine is composed of a cocoon-shaped housing and a triangular rotary piston that rotates in the housing in a direction of an arrow (in FIGS. 7 and 8).

In the conventional case, as shown in FIG.
The inner wall of 11 is a 2-section peritrochoid curve or a 2-section epitrochoid curve (with the center O _{1 of the} housing 11 as the origin)
And the flank surface 33 of the rotary rotor 13
Is formed along a 2-node peritrochoid inner envelope or a 2-node epitrochoid inner envelope (with the center O ₂ of the rotating rotor 13 as the origin), and the inner wall surface of the housing 11 is hypothesized as shown in FIG. Formed along the outer envelope of the trochoid (starting from the center O _{1 of the} housing 11) and the flank surface of the rotating rotor 13
33 is formed along a hypotrochoid curve (with the center O ₂ of the rotating rotor 13 as the origin).

[Problems of Prior Art] However, in the former case, as shown in FIG. 7, there is a gap S between the rotor 13 and the ends of the intake port 17 and the exhaust port 19 on the weir 21 side, and in the latter case. As shown in FIG.
A gap S is formed between the suction port 17 and the end of the suction port 17 and the discharge port 19 on the side opposite to the weir 21, and one compression chamber (R ₁ ,
In the drawing, R ₂ ) sometimes communicates with the suction port 17 and the compression chamber 19, and as a result, there is a disadvantage that a phenomenon unsuitable for a rotary piston engine that repeats compression and expansion strokes occurs.

(Structure of the Invention) [Means for Solving the Problems] The present invention is to solve the above problems, and its gist is to provide a cocoon-shaped housing and a rotating rotor having a substantially triangular cross section. In the rotary piston type engine, the suction port or the discharge port is formed on both sides of the cocoon-shaped weir portion in the housing, and the compression rotor expands while the rotary rotor rotates in the housing. The cross-sectional shape of the surface is formed along the inner envelope of the epitrochoid drawn with the center of the rotating rotor as the origin, and the ridge is formed on the apex side of this flank along the axial direction of the rotor. In addition, the cross-sectional shape of this ridge is formed along a hypotrochoidal curve drawn with the center of the rotating rotor as the origin, and the inner wall surface of the housing is It is formed along an epitrochoidal curve drawn with the center of the origin as the origin, and a curved groove is formed in the vicinity of both sides of the dam portion of the inner wall surface along the axial direction of the housing and the sectional shape of the curved groove is formed. A rotary piston engine characterized in that it is formed along an outer envelope of a hypotrochoid drawn with the center of the housing as an origin.

[Operation of the invention]

In the rotary piston type engine according to the present invention, the cross-sectional shape of the flank surface of the rotor is formed along the inner envelope of the epitrochoid drawn with the center of the rotary rotor as the origin, and A ridge is formed on the apex side along the axial direction of the rotor, and is formed along the cross-sectional shape of this ridge and the hypotrochoid curve drawn with the center of the rotating rotor as the origin. When the ridge portion of the rotor reaches the position of the discharge port (suction port), the apex end of the ridge portion can seal the anti-weir end of the discharge port (suction port) (see FIG. 7). The end of the striation opposite to the apex can seal the weir side end of the discharge port (suction port) (see FIG. 8).

Further, in this rotary piston engine, the inner wall surface of the housing is formed along an epitrochoid curve drawn with the center of the housing as an origin, and in the vicinity of the dam portion of the inner wall surface along the axial direction of the housing. Since the curved groove is formed and the cross-sectional shape of this curved groove is formed along the outer envelope of the hypotrochoid drawn with the center of the housing as the origin, the rotary piston formed as described above moves inside the housing. It can rotate without hindrance.

[Explanation of Examples]

An embodiment of the present invention will be described below with reference to FIGS.

1 to 4, reference numeral 11 denotes a housing of the rotary piston type engine 10, the inner wall surface of which is formed along a trochoidal curve. Further, 13 is a rotating rotor. The cross section of the rotary rotor 13 is formed in a substantially triangular shape along the inner envelope of the trochoid on the inner wall surface of the housing 11. This rotor 13 is a center of revolution about O ₁ in the housing 11 (rotating shaft).
Eccentric rotation with O ₂ as the center of rotation. In addition,
E is an eccentric distance.

Next, 17 and 17 are inlets and 19 and 19 are outlets.
A pair is formed on both side walls of the housing 11 with 1 as a boundary.

In the rotary piston type engine configured in this way,
The rotary rotor 13 rotates clockwise while sequentially taking the states of FIG. 1, FIG. 2, FIG. 3, and FIG.

31 and 32 are ridges, and flanks 33, 33 and 3 of the rotor 13
It is formed in the vicinity of the apexes 35, 35, 35 of 3. Of these ridges 31, 32, the width of the ridge 31 is equal to the diameter of the discharge port 19 which the rotor 13 traverses, and the width of the ridge 32 is the rotor.
It is equal to the diameter of the suction port 17 which 13 crosses.

Next, how to determine the shape of the protrusion 31 of the rotor 13 will be described with reference to FIGS. 5 and 6.

The XY coordinates are determined with the center O _{2 of the} rotor 13 as the origin, and the distance from the center O _{1 of the} housing 11 to the weir 21 side end M of the outlet 19 is H, and the angle between O ₁ M and the X axis is defined. When G is a variable, L is an eccentric distance, and E is an eccentric distance, an equation represented by x = H cos (L + G) -E cos2L y = E sin2L + H sin (L + G) is a curve 43. The P portion of the curve 43 represents the shape of the protruding portion 31 of the rotor 13. The ridge 32 (see FIGS. 1 to 4) also has a suction port 17
It can be similarly determined based on the end of the anti-weir 21 side.

Next, how to determine the cross-sectional shape of the curved portion 41 of the housing 11 will be described with reference to FIG.

First, with the center O _{1 of the} housing 11 as the origin, the XY ′ coordinates are determined, and the distance of the straight line connecting the center O _{2 of the} rotor 13 and the point V on the flank surface is D, and its O ₂ V and X axis. Let S be the angle formed by and L be the curve (not shown) obtained by the following equation.

x = D cos (S−L / 3) + E cosL y = D sin (S−L / 3) −E sinL Then, the cross-sectional shape of the curved portion 41 is obtained by moving the point V on the flank surface. The curve A is drawn innumerably and is formed based on the circumscribed curve of these curves A.

In this manner, if the curved portion 41 is formed from one edge of the opening of the inlet 17 and the outlet 19 on the inner wall surface of the housing 11 to the vicinity of the other end in the anti-weir direction, the rotor 13 is formed. Even if the ridges 31 and 32 are present, the rotor 13 can rotate in the housing 11 without trouble (see FIGS. 2 and 4).

(Effect of the Invention) In the rotary piston engine according to the present invention, the cross-sectional shape of the flank surface of the rotor is formed along the inner envelope of the epitrochoid drawn with the center of the rotary rotor as the origin, and A ridge portion is formed along the axial direction of the rotor on the apex side of the flank surface, and a cross-sectional shape of the ridge portion is formed along a hypotrochoid curve drawn with the center of the rotating rotor as an origin. Therefore, when the protrusion of the rotating rotor reaches the position of the discharge port (suction port), the apex end of this protrusion can seal the anti-weir end of the discharge port (suction port) (Fig. 7). (Refer to FIG. 8), the weir side end of the discharge port (suction port) can be sealed by the end of the apex of the protrusion.

Therefore, the one compression chamber does not communicate with the discharge side and the suction side during the rotation of the rotary rotor.

Further, in this rotary piston engine, the inner wall surface of the housing is formed along an epitrochoid curve drawn with the center of the housing as an origin, and in the vicinity of the dam portion of the inner wall surface along the axial direction of the housing. Since the curved groove is formed and the cross-sectional shape of this curved groove is formed along the outer envelope of the hypotrochoid drawn with the center of the housing as the origin, the rotary piston formed as described above moves inside the housing. It can rotate without hindrance.

[Brief description of drawings]

1 to 6 show an embodiment of a rotary piston type engine according to the present invention. FIGS. 1 to 4 are sectional views showing a rotating state of a rotor, and FIG. 5 is a protrusion of the rotor. 6 is an enlarged view of a VI portion in FIG. 5, and FIGS. 7 and 8 are sectional views of a conventional example. 10 …… Rotating piston type engine 11 …… Housing 13 …… Rotating rotor 17 …… Intake port 19 …… Exhaust port 21 …… Weir part 31,32 …… Projection part 33 …… Frank surface 41 …… Curved groove O ₁ …… Housing center O ₂ …… Rotating rotor center

Claims (1)

[Claims] 1. A cocoon-shaped housing and a rotating rotor having a substantially triangular cross section, wherein a suction port or a discharge port is formed with a cocoon-shaped dam in the housing as a boundary, and the inside of the housing is the rotating rotor. In the rotary piston type engine in which the compression stroke is repeated while rotating, the cross-sectional shape of the flank surface of the rotor is formed along the inner envelope of the epitrochoid drawn with the center of the rotary rotor as the apex, and A ridge portion is formed along the axial direction of the rotor on the apex side of the surface, and a cross-sectional shape of the ridge portion is formed along a hypotrochoidal curve drawn with the center of the rotating rotor as the origin. The inner wall surface of the housing is formed along an epitrochoidal curve drawn with the center of the housing as an origin, and the inner wall surface is formed near both sides of the dam portion. A rotary piston type engine characterized in that a curved groove is formed along the axial direction of the housing and a cross-sectional shape of the curved groove is formed along an outer envelope of a hypotrochoid drawn with the center of the housing as an origin. .