JPH0653729U - Rotor structure of rotary piston engine - Google Patents

Abstract

(57) [Summary] [Object] To provide a rotor structure of a rotary piston engine capable of reducing unburned loss on the delay side of the rotor and heat loss. A rotor body (14), a combustion recess (20a) formed on a flank of the rotor body (14), and a traveling direction of the combustion recess (20a) formed on the flank and starting from a predetermined position on the trailing side of the flank. A communication groove 20b that communicates from the side is provided in a substantially central portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotor structure of a rotary piston engine, and more particularly, to a shape of a combustion recess (recess) formed on a flank surface of the rotor.

[0002]

[Prior art]

 In a rotary piston engine, the inner space of the rotor housing is partitioned by a rotor into three working chambers, and an apex seal is arranged at each vertex of the rotor to seal the three working chambers. ing. With this apex seal, the working chambers are sealed with a very high degree of accuracy, but on the lagging side (trailing side) of the working chamber, the air inside the working chamber is compressed to a high pressure. Therefore, the high-pressure air around the pointed plug may slightly leak from the lag side apex seal portion. If this high-pressure, unburned gas leaks from the main working chamber and enters the sub working chamber, abnormal combustion may occur, resulting in knocking or the like.

As one method for solving such a problem, the one disclosed in Japanese Patent Publication No. 41-8722 is known. In this method, as shown in FIGS. 4 and 5, a groove 114 is formed on the flank 112 from the main recess 113 of the flank 112 of the rotor 103 toward the delay side of the rotor 103. It By forming the groove 114 on the flank 112 in this manner, when the rotor 103 reaches the position shown in FIG. 4, the high pressure gas located around the puncturing plug on the delay side of the main working chamber is prevented. The flow through the groove 114 facilitates the flow toward the main recess 113 side, and the outflow of high-pressure gas to the sub working chamber is prevented.

[0004]

[Problems to be solved by the device]

 On the other hand, in the rotary piston engine, as described above, since the air inside the working chamber is compressed to a high pressure on the delay side of the working chamber, this high-pressure gas may leak to the adjacent working chamber. Then, a high-speed airflow is generated toward the center of the main working chamber where the volume increases and the pressure decreases as the rotor moves. This is called the squish style. Due to this squish flow, the flame around the pointed plug is prevented from spreading to the delay side of the pointed plug, and stays in the vicinity of the recess cut-up portion as shown in FIGS. 6 and 7. As a result, the gas on the delay side of the rotor becomes difficult to burn, which causes a problem that unburned loss increases. In addition, the S / V ratio (surface area in the combustion chamber / volume of the combustion chamber) becomes large in the stagnant portion, and most of the combustion energy generated here is dissipated as heat and is not used as energy for rotating the rotor, so heat loss is reduced. There is also the problem of increase.

In Japanese Patent Publication No. 41-8722 described above, since the groove 114 is formed substantially in the center of the rotor in the width direction, the groove 114 passes directly below the spark plug, and the spark plug Since the gas burns in the groove 114 due to the heat of the surroundings, the combustion also occurs in a state where the S / V ratio is large, and the heat loss increases. Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to reduce unburned loss on the delay side of the rotor and heat loss. It is to provide a rotor structure of a rotary piston engine.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems and to achieve the object, a rotor structure of a rotary piston engine of the present invention has a rotor body, a combustion recess formed on a flank surface of the rotor body, and a flank surface on the flank surface. It is characterized in that it is provided with a communication groove which is formed from a predetermined position on the trailing side of the flank surface as a starting point, and which communicates from a lateral side to a substantially central portion in the traveling direction of the combustion recess.

Further, in the rotor structure of the rotary piston engine according to the present invention, the communication groove is formed on both sides of the combustion recess. Further, in the rotor structure of the rotary piston engine according to the present invention, the communication groove described above is formed only on one side of the combustion recess.

[0008]

[Action]

 As described above, since the rotor structure of the rotary piston engine according to the present invention is configured, the unburned gas existing on the delay side of the rotor is introduced into the combustion recess through the communication groove and burned. The unburned loss of gas on the delay side of the rotor can be reduced. In addition, by connecting the communication groove to the side of the combustion recess, the communication groove does not come directly below the spark plug, so unburned gas does not burn in the communication groove and the S / Since it is brought to the center of the combustion recess having a small V ratio and then burned, it is possible to reduce heat loss.

[0009]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. (First Embodiment) FIG. 1 is a side sectional view showing a rotor structure of a rotary piston engine of a first embodiment. Further, FIG. 2 is a front view of FIG. 1 viewed from the right side.

In FIG. 1, a rotor 14 is arranged inside the rotor housing 12 as is well known, and the rotor 14 is configured to rotate in the clockwise direction in the drawing with respect to the rotor housing 12. There is. The apex seals 16 are arranged at the three vertices of the rotor 14, and between the three working chambers 18a, 18b, 18c surrounded by the inner wall 12a of the rotor housing 12 and the outer peripheral surfaces 14a, 14b, 14c of the rotor 14. It is designed to be sealed. Here, the working chamber 18a in which combustion is performed when the rotor 14 is located at the position shown in FIG. 1 is called the main working chamber, and the other two working chambers 18b and 18c are called the sub working chambers. I will decide.

A recess (combustion recess) 20 as shown in FIGS. 1 and 2 is formed on the outer peripheral surface 14 a of the rotor 14, and the shape and position of the recess 20 have a great influence on the combustion characteristics of the rotary engine. give. It should be noted that although similar recesses are formed on the outer peripheral surfaces 14b and 14c of the rotor 14, they are omitted in the drawing. In the first embodiment, the recess 20 is composed of a main recess 20a having a shape substantially similar to the shape of the recess conventionally used, and a communication groove 20b communicating with the main recess 20a. . As shown in FIG. 2, one end 20b1 of the communicating groove 20b is connected to the substantially central portion of the main recess 20a in the vertical direction, and the other end 20b2 of the communicating groove 20b faces the lagging side (trailing side) of the rotor 14. It is growing. Two communication grooves 20b are arranged with respect to the main recess 20a, and these communication grooves 20b are arranged symmetrically with respect to the center of the main recess 20a.

The operation of the communication groove 20b formed on the surface of the rotor 14 as described above will be described. First, in the rotary piston engine, since the space 18a1 on the delay side of the main working chamber 18a is compressed to a very small volume as the rotor 14 rotates and becomes high pressure as already described in the section of the prior art, A high-speed air flow (squish flow) is generated from the space 18a1 toward the space 18a2 on the advancing side, the volume of which gradually increases. Due to the squish flow, the flame around the spark plug 22 is prevented from spreading in the direction of the space portion 18a1 on the delay side, and stays in the vicinity of the end portion 20a1 on the delay side of the main recess 20. . Therefore, the gas existing in the vicinity of the space 18a1 is in an unburned state and the unburned loss increases.

On the other hand, when the communication groove 20b is provided on the surface of the rotor 14 as in the first embodiment, unburned gas existing in the vicinity of the space 18a1 passes through the communication groove 20b. Then, it is brought to the center of the main recess 20a and burned in the main recess 20a. As a result, unburned gas is less likely to remain in the vicinity of the space 18a1, and unburned loss can be reduced.

Further, since the communication groove 20b is arranged on the left and right of the ignition plug 22 so as to bypass the ignition plug 22 as shown in FIG. 2, the unburned gas passing through the communication groove 20b is not burned. Is not exposed to high temperatures near the spark plug 22. Therefore, the unburned gas does not burn in the communication groove 20b having a large S / V (surface area of the combustion chamber / volume of the combustion chamber) ratio and is introduced into the main recess 20a having a small S / V ratio. After burning, it burns. When the unburned gas burns in a portion with a large S / V ratio, the combustion energy is mostly dissipated as heat, so it does not work as energy for driving the rotor 14, but the main recess 20a with a small S / V ratio. When the unburned gas burns inside, the energy becomes energy for rotating the rotor 14. Due to this reason, heat loss can be reduced in the first embodiment.

Further, when only the main recess 20a is formed in the rotor 14 as in the conventional case, the squish flow is mainly generated near the delay side end 20a1 of the main recess 20a, that is, The squish flow is generated only in the substantially central portion of the rotor 14 in the thickness direction, but by forming the communication groove 20b, the squish flow is also dispersed in this communication groove 20b, so that the flow velocity of the squish flow can be reduced. . As a result, the flame from the spark plug is more likely to burn and spread in the space on the delay side of the combustion chamber 18a, so that the unburned loss can be further reduced.

As described above, in the first embodiment, the two communication grooves 20b are formed so as to bypass the ignition plug 22 from the delay side of the rotor 14 toward the central portion of the main recess 20a. As a result, the unburned gas on the delay side of the combustion chamber 18a can be introduced into the central portion of the main recess 20a, so that unburned loss and heat loss can be reduced. Further, since the flow velocity of the squish flow can be reduced, it is possible to promote the flame spread to the delay side of the combustion chamber 18a and further reduce the unburned loss. (Second Embodiment) FIG. 3 is a front view showing a rotor structure of a second embodiment. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the first embodiment described above, the communication grooves 20b are arranged on both sides of the main recess 20a. However, in the second embodiment, the communication groove 20c is formed only on the right side of the main recess 20a. is doing. In this way, when the communication groove 20c is provided only on one side of the main recess 20a, the unburned gas on the right side of the space 18a1 on the delay side of the combustion chamber 18a is easily introduced into the main recess 20a, but not on the left side. Fuel gas is difficult to introduce into the main recess. Therefore, in the second embodiment, the upper end portion 20c1 of the communication groove 20c is extended to the vicinity of the center in the thickness direction of the rotor 14 so that the unburned gas on the left side is also easily introduced into the main recess 20a. ing.

Also in this second embodiment, the unburned gas on the delay side of the combustion chamber can be introduced into the central portion of the main recess 20a in exactly the same manner as the first embodiment. It is possible to reduce heat loss. Further, since the flow velocity of the squish flow can be reduced, it is possible to promote the flame spread to the delay side of the combustion chamber and further reduce the unburned loss.

Further, when the communication groove 20c is provided only on one side of the main recess 20a, when the gas passing through the communication groove 20c is ejected into the main recess 20a, the spiral recess is formed in the main recess 20a. Generate an air flow. As a result, the gas in the main recess 20a is disturbed, the concentration of the gas in the main recess 20a is made uniform, and combustion in the combustion chamber is favorably performed.

Further, in the above description, the case where the communication groove 20c is formed only on the right side of the rotor 14 has been described, but it goes without saying that it may be formed only on the left side of the rotor 14. The present invention can be applied to modifications and variations of the above embodiments without departing from the spirit of the invention.

[0021]

[Effect of device]

 As described above, according to the rotor structure of the rotary piston engine of the present invention, the unburned gas existing on the delay side of the rotor is introduced into the combustion recess through the communication groove and burned, whereby Unburned loss of gas on the delay side can be reduced. In addition, by connecting the communication groove to the side of the combustion recess, the communication groove does not come directly below the ignition plug, so unburned gas does not burn in the communication groove, and the S / V Since it comes to the center of the combustion recess having a small ratio and then burns, it is possible to reduce heat loss.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a rotor structure of a rotary piston engine of a first embodiment.

FIG. 2 is a front view of FIG. 1 viewed from the right side.

FIG. 3 is a front view showing a rotor structure of a second embodiment.

FIG. 4 is a side sectional view showing a rotor structure of a conventional rotary piston engine.

FIG. 5 is an enlarged view of a recess portion formed in the rotor.

FIG. 6 is a side sectional view showing a rotor structure of a conventional rotary piston engine.

FIG. 7 is a front view of FIG. 6 viewed from the right side.

[Explanation of symbols]

 12 rotor housing 14 rotor 16 apex seal 18a, 18b, 18c working chamber 20a recess 20b communication groove 22 spark plug

Claims (3)

[Scope of utility model registration request] 1. A rotor body, a combustion recess formed on a flank surface of the rotor body, and a combustion recess formed on the flank surface at a predetermined position on the trailing side of the flank surface as a starting point. A rotor structure for a rotary piston engine, comprising: a communication groove that communicates from the side in a substantially central portion in the traveling direction. 2. The rotor structure for a rotary piston engine according to claim 1, wherein the communication groove is formed on both sides of the combustion recess. 3. The rotor structure for a rotary piston engine according to claim 1, wherein the communication groove is formed only on one side of the combustion recess.