JPS601327A - Rotary piston engine - Google Patents

Abstract

PURPOSE:To reduce unburnt HC component without sacrifice of fuel consumption, by setting the projected distance of trailing edge of rotor recess from the center of rotor of rotary piston to the value obtainable from particular formula. CONSTITUTION:In a rotary piston engine where a triangular rotor 4 supported by an eccentric shaft 5 is performing planetary rotation in a rotor housing 2 having poly-arched innercircumferential face 2a, the trailing edge 7a of rotor recess 7 formed in each flank face 4a of rotor 4 is provided at the position where the projected distance at the eccentric shaft rotary angle alpha(85<=alpha<=110) will match with the short shaft section (K) of rotor housing 2. Assuming the projected distance of said edge section 7a from the center of rotor (A) is (L), formed radius is (R) and the eccentric amount is (e), they are set to satisfy the formula L=(R-e).sin(alpha/3)+e.sin(2alpha/3).

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a rotary piston engine, and in particular, to a rotary piston engine, the present invention relates to a rotary piston engine. This is related to location settings.

(Prior Art) Generally, in a rotary piston engine, a polygonal rotor is supported by an eccentric shaft inside a casing that is composed of a rotor howling having a polycylindrical inner peripheral surface and side housings arranged on both sides of the rotor howling. As the rotor rotates, the inside of the casing is defined into three working chambers, and each stroke of intake, compression, explosion, expansion, and exhaust is performed in sequence.

Conventionally, in such a [1-cripiston engine, as shown in Japanese Patent Publication No. 10689/1989, the position of the leading side edge of the rotaryless, that is, the position of the leading side edge and the spark plug By appropriately setting the relationship between the position of the hole and the minimum clearance point between the ■-tough flank and the inner peripheral surface of the 〇-ta housing, the spark plug hole can be completely scavenged and the spark performance for a lean mixture can be improved. Improve J: Sea urchin has been proposed.

However, the position of the trailing side edge of the rotary recess in a rotary piston engine is not sufficiently determined by J′.
The current situation is that this is not being noticed.

(Purpose of the Invention) Therefore, the present inventors have discovered that in the above rotary piston engine, if only the position of the trailing side edge of the rotary recess is changed without changing the position of the leading side edge, the unburned component HC It has been experimentally discovered that the fuel consumption and fuel consumption rate show the trend characteristics shown in Figure 1. In other words, it has been found that by setting the position of the trailing side edge of the rotary recess within a specific range, it is possible to reduce the unburned component HC without deteriorating the fuel efficiency.

Based on this knowledge, an object of the present invention is to appropriately set the position of the 1-railing side edge of the rotary recess to reduce unburned HC without deteriorating the fuel efficiency.

(Structure of the invention) In order to achieve the above object, the technical solution of the present invention is as follows:
In the rotary piston engine as described above, as shown in FIG. 2, the projection mu of the trailing side edge 7a of the rotary recess 7 from the rotor center of the rotor 4 is set by the following relational expression.

ji -(R-e) -5in (cz/3)+e-
sin(2α/3) ・=(I) However, R: θj radius, e: eccentric claw, α: eccentric shaft rotation angle, 85°≦α≦11
0°Here, the position of the 1-railing side trunk of the rotaryless is set so that the timing at which combustion ends and the flame goes out is 85° at the eccentric shaft rotation angle after top dead center as shown in Figure 3 J°.
M is 110 degrees, and this depends on the positional relationship with the short axis of the rotor housing, which is the limit position where combustion is possible in this rotor posture. In other words, if the trailing side edge of the rotary recess is located closer to the leading side than the short axis of the rotor housing in the sun-to-sun position (85゛≦α≦110'') at the end of combustion, the flame is more difficult to propagate to the -E flow (trailing side) than the trailing side edge of the rotary recess, so unburned gas remains on the trailing side of the rotary recess than the trailing side edge, and the unburned component HC On the other hand, if the trailing side edge of the rotor recess is located closer to the trailing side than the rotor housing short axis, the rotor housing short axis will increase due to the small gap between the rotor and the rotor housing. Since it is difficult for the flame to propagate to the trailing side than the rotor housing short shaft part, the 〇-talise part on the trailing side is the area where combustion does not occur, and the amount of unburned gas in the mouth area is also less than the above. In contrast, in the rotor posture at the end of combustion, the trailing side edge of the rotary recess coincides with the short axis of the rotor housing at the above projection distance. In this case, it is possible to combust the entire combustible area on the leading side of the short axis of the rotor housing, thereby eliminating deterioration in fuel efficiency and reducing unburned components 1-IC. It depends.

From this, the trailing side edge of the rotary recess is aligned with the short axis of the rotor housing in the rotor attitude at the end of combustion (85°≦α≦110'), that is, the projection 1111 from the rotor center is From the above equation, combustion is carried out efficiently and without waste in the entire rotary recess.

(Effect of the Invention) Therefore, according to the present invention, the projected distance of the trailing side edge of the rotary recess from the rotor center is set to the above formula (I), and the trailing side of the rotary recess is set in the rotor attitude at the end of combustion. By aligning the edge and the short axis of the rotor housing, combustion can be carried out effectively over the entire rotary recess, improving fuel efficiency and reducing unburned components. I can do it,
Therefore, the simple configuration of setting the position of the trailing side edge of the rotary recess can contribute to improving the performance of the rotary piston engine.

(Example) Hereinafter, an example as a specific example of the technical means of the present invention will be described with reference to the drawings.

In FIG. 4, 1 is a casing composed of a rotor housing 2 having a multi-arc inner circumferential surface 2a and side housings 3.3 disposed on both sides of the rotor housing 2, and 4 is an eccentric shaft 5 that connects the inside of the casing 1. It is a polygonal rotor that is supported and rotates 3tiJf1, and as the rotor 4 rotates, the inside of the casing 1 is defined into three working chambers 6.6.6, and air intake, compression, explosion, expansion and It is configured to perform each exhaust stroke sequentially. In addition, 7 is a rotary recess formed in each flank surface 4a of the rotor 4, and 8 is a spark plug. In addition, e is the eccentricityff1SR is the generation radius, α
respectively represent the rotation angle of the eccentric shaft 5 after top dead center (ATDC). Also, pl and! I2 are the short axis J3 and long axis of the low housing 2, respectively.

And the trailing side edge 7a of the rotary recess 7
is the rotor's 4 positions at the time when combustion is finished and the flame is extinguished (
(rotor posture as shown in Fig. 4), that is, as shown in Fig. 3, the eccentric shaft rotation angle α after top dead center is 85″≦α≦
In the range of 110'', the position is set so that the projection distance coincides with the rotor housing short axis) ((the intersection of the rotor housing inner circumferential surface 2a and the short axis 91). , 1-1-talices 7 from the rotor center
The projected distance NIQ of the trailing side edge 7a of the trailing side edge 7a is N-PK-PQ+QK as shown in FIG. -sin (α-α/3) xQ -5in (2α/3) σπ-δ ball・sin (α/3) = (R-e) -sin (α/3), so
Therefore, the relationship expressed by the above-mentioned formula (I) is established.

Furthermore, the 1-railing side edge 7 of the rotary recess 7
The cut-up angle of a is 1 to θ, that is, the 1-railing side edge 7
The angle formed between the bottom surface of the rotary recess 7 and the tuff flank surface 4a at point a is set to θ≦30°.

The setting of this cut-up angle θ is from 85″ to 85″ at the end of combustion.
1'10°A T D CIc 83 Since the gas flow near the short axis of the rotor housing flows in the trailing direction with respect to the rotational direction Upward portion (trailing side edge 7a>
This causes turbulent flow, which absorbs heat from the surrounding walls and reduces gas leakage. Component H
This results in an increase in C. On the other hand, if the cut-up angle θ is small, the above-mentioned flame extinction can be prevented, and the cut-up portion (trailing side edge 7a
), the flame propagates somewhat toward the trailing side, leading to a reduction in the unburned component 1-IC, and the maximum angle θ is shown in Figure 6. It has been experimentally determined that the value is 30', so 0≦30'' is preferable.

Therefore, in the above embodiment, the projected distance 11111 of the trailing side edge 7a of the 0-talise 7 from the rotor center A at the rotor attitude at the end of combustion, that is, 85 to 110 degrees ATDC, is determined by the relationship of equation (I) above. By setting the trailing side edge 7a of the rotor recess 7 to coincide with the rotor housing short axis 1, the combustible range C is a region on the leading side of the rotor housing short axis, that is, the rotor recess. Therefore, the unburned component 1-IC can be effectively reduced without deteriorating the fuel consumption rate.

Furthermore, the trailing side edge 7a of the rotary
If the cut-up angle θ is set to θ≦30°, it is possible to prevent the flame from being extinguished due to turbulence in the gas flow at the trailing side edge 7a of the rotary recess 7, and direct the flame to the trailing side edge 7a.
Since it can be propagated somewhat from a to the railing side direction,
The unburned component IC can be further reduced.

[Brief explanation of drawings]

Figure 1 shows the unburned component HC[
Figure 2 is a plan view of the rotor flank, Figure 3 is a characteristic diagram showing the relationship between combustion end timing and the angle of eccentric six-axis rotation after top dead center. Fig. 4 shows an embodiment of the present invention; Fig. 5 is an explanatory view of the main parts; Fig. 6 shows the unburned component (It is a characteristic diagram showing the relationship between 1...Casing, 2...[1-Tahousing, 2
a...Inner peripheral surface, 3...Side housing, 4...
Rotor, 5... Eccentric shaft, 7... Rotary recess, 7a
... Trailing side edge of rotary recess, e... Eccentricity ffi, R... D1 radius, α... Eccentric shaft rotation angle. Patent applicant Toyo Kogyo Co., Ltd. Figure 1 Step Jh distance #1lfl! Figure 3 ('/,) ka'. 230 Groups - Total Figure 2 Figure 6 Figure 4 Figure 5

Claims (1)

[Claims] (1) In a rotary piston engine in which a polygonal rotor supported by an eccentric shaft rotates planetarily within a rotor housing that extends along a polygonal arc-shaped inner peripheral surface,
A rotary piston engine characterized in that a projected distance 111i of a trailing side edge of a rotary recess from the center of a rotary recess is set according to the following relational expression. 9-(R-c)-5in (α/3)+e-si
n (2α/3) However, R: generation radius, e: eccentricity amount, α: eccentric shaft rotation angle, 85″≦α≦110°