JP5817986B2 - Rotary piston engine - Google Patents

Description

  The present invention relates to a rotary piston engine, and more particularly to a rotary piston engine having a rotor housing, a side housing, and a rotor housed in a rotor housing chamber surrounded by these housings.

In a rotary piston engine, an oil seal is generally provided between a rotor and a side housing.
In such a rotary piston engine, a technique is known in which the amount of oil supplied to the rotor accommodating chamber is controlled in accordance with the operating state of the engine to suppress oil consumption (Patent Document 1).
In Patent Document 2, in a two-cycle piston engine whose structure is completely different from that of a rotary piston engine, oil adhering to the cylinder chamber 1 is scraped off by an oil ring 18 and scraped off to the lower part of the oil ring 18. A technique is disclosed in which oil is reliably scraped by returning the accumulated oil to the crank chamber 13 through an oil dropping hole 19 formed in the piston 11.

JP 2010-174740 A Japanese Utility Model Publication No. 63-65823

  However, in the conventional rotary piston engine as described above, when the engine speed increases, engine oil leaks into the working chamber (combustion chamber) due to centrifugal force at the seal portion between the rotor and the side housing, and oil consumption There was a problem that the amount deteriorated.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a rotary piston engine capable of suppressing deterioration of oil consumption.

In order to achieve the above object, the present invention has a rotor housing, a side housing, three top portions accommodated in a rotor accommodating chamber surrounded by the rotor housing and the side housing, and three working chambers. A rotary piston engine having a seal member that seals a gap between an outer surface of the rotor and a side housing, and the rotor is formed on an inner side of a top portion capable of guiding oil. An internal space and a seal groove for holding a seal member are formed, and a communication hole communicating with the internal space at the top of the rotor is formed in the seal groove of the rotor.
In the present invention configured as described above, a communication hole that communicates with the internal space of the rotor is formed in the seal groove of the rotor that holds the seal member, so that it enters the gap between the outer surface of the rotor and the side housing. The oil thus made can flow into the inner space of the rotor through the communication hole, thereby preventing the oil from flowing into the working chamber (combustion chamber). Therefore, oil consumption can be reduced and deterioration of oil consumption can be suppressed.

In the present invention, preferably, the internal space is provided in each of the three top portions of the rotor, and a plurality of communication holes are formed so as to communicate with the internal space provided in each of the three top portions. .
In the present invention configured as described above, the internal spaces respectively provided in the three top portions of the rotor are formed so as to spread at positions farther away from the rotor radial direction. When the rotor rotates, the oil is biased outward in the radial direction of the rotor by centrifugal force, so that the oil level of the cooling oil in the internal space is maintained radially outward from the communication hole. Therefore, it is possible to prevent the cooling oil in the internal space from flowing back into the communication hole.

In the present invention, preferably, the seal member and the seal groove are provided double in the radial direction of the rotor, and the communication hole is formed in the seal groove on the inner side in the rotor radial direction.
In the present invention configured as described above, since the communication hole is formed in the seal groove of the radially inward seal member, it is possible to more effectively prevent the oil from flowing into the working chamber. I can do it. Moreover, it is possible to effectively prevent the oil in the internal space at the top of the rotor from flowing backward from the communication hole to the seal member side.

In the present invention, preferably, the communication hole is formed on each straight line connecting the center of the rotor and the three top portions of the rotor.
In this invention comprised in this way, it can prevent more reliably that the oil in internal space flows back from a communicating hole to the seal member side.

  In the rotary piston engine according to the present invention, it is possible to suppress the deterioration of the oil consumption.

It is sectional drawing which shows the main structures of the rotary piston engine by embodiment of this invention. It is sectional drawing seen along the II-II line of FIG. It is sectional drawing seen along the III-III line of FIG. It is a perspective view which shows the rotor by embodiment of this invention. It is a side view of the rotor by embodiment of this invention. FIG. 6 is an enlarged cross-sectional view of a main part viewed along line VI-VI in FIG. 5, showing a schematic configuration of a seal structure provided in the rotor according to the embodiment of the present invention.

Hereinafter, a rotary piston engine according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, the main configuration of a rotary piston engine according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a sectional view showing a main configuration of a rotary piston engine according to an embodiment of the present invention.
First, as shown in FIG. 1, a rotary piston engine 1 according to an embodiment of the present invention is surrounded by a saddle-shaped rotor housing 2 having a trochoid inner peripheral surface 2a, a side housing 3, and these housings 2, 3. A rotor housing chamber 4, a substantially triangular rotor 6 housed in the rotor housing chamber 4, and three working chambers 5 formed on the outer peripheral side of the rotor 6. Although not shown, the rotary piston engine 1 according to the present embodiment is a so-called two-rotor type rotary engine in which two rotor housings 2 are sandwiched between three side housings 3 and integrated.

  Further, the rotary piston engine 1 has an eccentric shaft (shaft) 8 that protrudes into each rotor accommodating chamber 4 through substantially the center of each side housing 3 and front cover (not shown). The rotor 6 is rotatably supported with respect to the eccentric wheel 8 a of the eccentric shaft 8, and an internal gear 9 (see FIG. 2) provided on the inner side of the rotor 6 is fixed on the side housing 3. (See FIG. 2), and the planetary rotational movement in which the movement locus is defined by these eccentric wheels 8a and the respective gears. That is, the rotor 6 rotates around the eccentric ring 8a of the shaft 8 while the apex seals 12 provided on the three outer peripheral tops 10 are in contact with and sliding on the inner surface 2a of the trochoid. Revolve around 8 axis X.

  In addition, an intake port 14 and an exhaust port 16 are formed in the side housing 3. As shown in FIG. 1, each port 14, 16 is opened at a predetermined position in the rotor accommodating chamber 4, and performs intake of air-fuel mixture and exhaust of exhaust gas to the working chamber 5. The rotor housing 2 is provided with two spark plugs 18 for igniting the air-fuel mixture in the working chamber 5.

  The working chamber 5 is formed between the tops 10 respectively. Each working chamber 5 performs four strokes of intake, compression, expansion (combustion), and exhaust with a predetermined phase difference while moving in the circumferential direction (clockwise in FIG. 1). The shaft 8 is rotated via For example, in FIG. 1, the working chamber 5 (upper working chamber in FIG. 1) communicating with the intake port 14 is at the intake top dead center and shifts to the compression stroke as the rotor 6 rotates. The air-fuel mixture is compressed inside the working chamber 5 that has shifted to the compression stroke, and the compressed air-fuel mixture is ignited by the spark plug 18 at a predetermined timing to perform an expansion stroke. For example, in FIG. 1, the working chamber 5 located at the lower right is in the first half of the expansion stroke, and the working chamber 5 is exhausted by the movement of the rotor 6 like the working chamber 5 located at the lower left in FIG. 1. When communicating with the port 16, the process proceeds to the exhaust stroke. Such a combustion cycle is performed once for every three rotations of the shaft 8 in each working chamber 5, and there are three working chambers 5 for the rotor 6, so that one combustion is performed for each rotation of the shaft 8. Performed once.

  Next, the apex seal 12 extends in the width direction of the rotor 6 so as to prevent high pressure gas from being blown out from the working chamber 5 due to combustion. On both side surfaces of the rotor 6, arcuate side seals 20 are provided so as to connect the adjacent top portions 10 together. These side seals 20 seal the gap between the outer surface of the rotor 6 and the side housing 3, and the top seals 10 of the rotor 6 are coupled to the side seals 20 with each other, A substantially cylindrical corner seal 22 opening on the housing 3 side is provided.

  Next, the rotary piston engine 1 includes a lubrication device 24 that directly supplies oil (engine oil) for lubrication to gas seal portions such as the apex seal 12, the side seal 20, and the corner seal 22. The lubrication device 24 takes out oil from an oil gallery 52 (see FIG. 2) for supplying oil to the main bearing of the shaft 8, adjusts the pressure with an oil control valve (not shown), and measures the pressure. The oil is sent out to the nozzles 26 and 28 facing the inner peripheral surface 2a of the trochoid of the rotor housing 2.

Next, mainly the internal structure of the rotor 6 and the shaft 8 will be described with reference to FIGS. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III in FIG. In FIG. 3, the rotor and the inner peripheral surface of the rotor housing are mainly shown.
As shown in FIGS. 2 and 3, the rotor 6 is provided with an annular central boss portion 30, a rotor outer peripheral portion 32 extending in a substantially triangular shape, and a plurality of ribs 34. The plurality of ribs 34 are formed so as to partition between the boss portion 30 and the outer peripheral portion 32, thereby forming a plurality of internal spaces 36.

  These internal spaces 36 have three relatively large top internal spaces 36a provided near the three tops of the rotor and other relatively small small internal spaces 36b. Cooling oil (engine oil) for cooling is supplied. The top inner space 36a is formed adjacent to the three top portions 10 of the rotor 6, and is formed so as to extend from the annular central boss portion 30 to a position farther in the radial direction than the small inner space 36b.

  Here, as shown in FIG. 2, the shaft 8 is formed with an oil passage 40 through which the above-described rotor cooling oil is fed from an oil pump (not shown). The shaft 8 is formed with a communication path 42 communicating with the internal space 36 described above, and a check ball 44 is provided in the communication path 42. Cooling oil is blown into the internal space 36 through the communication passage 42 and the check ball 44. Such oil spraying is performed by centrifugal force applied to the oil as the shaft 8 rotates.

The cooling oil sprayed to the internal space 36 in this manner seems to take heat from the inner wall surface while turning in the internal spaces 36a and 36b due to a change in the inertial force received by the planetary rotation of the rotor 6. It has become. An example of the state of oil in each of the internal spaces 36a and 36b is as shown in FIG.
After such cooling, the oil in each of the internal spaces 36a and 36b penetrates the shaft formed on either the front side or the rear side of the rotor 6 when the centripetal force is applied toward the rotor center. The oil is discharged into the oil ring passage 50 formed in the side housing 3 through the hole 46 and the shaft through hole 48 formed in the side surface portion on the rotor side of the side housing 3. In addition, the code | symbol 54 shown in FIG. 2 is a cooling water channel | path.

Next, referring to FIGS. 4 to 6, the seal structure of the gap between the outer surface of the rotor 6 and the side housing 3 in the rotary piston engine of the embodiment of the present invention will be described. 4 is a perspective view showing the rotor 6, FIG. 5 is a side view of the rotor 6, and FIG. 6 is a seal structure provided on the rotor 6 as seen along the line VI-VI in FIG. 5. It is a principal part expanded sectional view which shows schematic structure. 4 and 5 are diagrams in which illustration of each seal member is omitted, and FIG. 6 illustrates the side housing 3 and the cross-sectional configuration of the rotor 6 taken along line VI-VI in FIG. It is the figure which added the structure of the shaft.
First, as shown in FIGS. 4 and 5, a corner seal recess 60 and a side seal groove 62 for holding the corner seal 22 and the side seal 20 described above are formed on the outer surface of the rotor 6. Further, a cut-off seal groove 64, an outer oil seal groove 66, and an inner oil seal groove 68 are formed on the outer surface of the rotor 6. As shown in FIG. 5, these grooves 64, 66, 68 are formed so as to extend concentrically with respect to the central axis of the rotor 6.

  Next, as shown in FIG. 6, the side seal groove 62 includes a side seal member 70 and a support member 71 that elastically supports the side seal member 62, and the cut-off seal groove 64 elastically supports the cut-off seal member 72 and the same. A supporting member 73 is provided in the outer oil seal groove 66, and an outer oil seal member 74 and a support member 75 that elastically supports the outer oil seal member 74, and an inner oil seal groove 68 is provided in an inner oil seal member 76 and a support that elastically supports it. Each member 77 is provided. Further, the outer oil seal member 74 and the inner oil seal member 76 have O-rings 78 and 79 for preventing the oil in the inner oil seal groove 68 from leaking outward in the radial direction of the rotor 6. Here, the side seal member 70 is provided mainly to prevent the gas in the working chamber 5 from entering the inside of the rotor 6, and the cut-off seal member 72 is mainly used for the intake / exhaust ports 14, 16. Is provided in order to shorten the overlap period and reduce the internal EGR.

Further, as shown in FIG. 6, the outer oil seal member 74 and the inner oil seal member 76 are formed with edges 74 a and 76 a on the radially inner side and inclined surfaces 74 b and 76 b facing the side housing 3. As a result, oil in the gap between the rotor 6 and the side housing 3 is taken into the radially inner side of the rotor 6 (oil recovery) and a predetermined amount of oil film is maintained. It has a function of preventing the rotor 6 from entering the working chamber side from the inside in the radial direction.
More specifically, each seal member 74, 76 is a portion that moves radially outward with respect to the side housing 3 with the planetary rotation of the rotor 6. 8), the inclined surfaces 74b and 76b increase the pressure of the oil (lubricating oil) on the radially outer side (working chamber side) by the inclined surfaces 74b and 76b. 76b rides on the oil, takes the oil inward in the radial direction, and maintains a predetermined amount of oil film by a predetermined pressing load by being elastically supported, while each seal member 74, 76 A portion that moves radially inward with respect to the side housing 3 with the planetary rotation of the rotor 6 (that is, inward of the center of the shaft 8 among the seal members 74 and 76 that make one round). In only partial moving), the edge 74a, by 76a, oil (for cooling oil) is prevented from entering from the radially inner side of the rotor 6 in the outward radial direction side (working chamber side).

  Next, as shown in FIGS. 5 and 6, in the present embodiment, among the oil seals 74 and 76 provided double as described above, in the inner oil seal 76 on the inner side in the rotor radial direction, Three communication holes 80 are formed so that the inner oil seal groove 68 and the three top inner spaces 36a described above communicate with each other so as to maintain the above-described function when the engine rotates at a high speed.

As shown in FIG. 5, these communication holes 80 are formed so as to be located on respective straight lines connecting the center of the rotor and the three tops 10 of the rotor, and are indicated by a one-dot chain line in FIG. 3. Such a position close to the annular central boss 30 is formed so as to communicate with the top inner space 36a.
As shown in FIG. 6, these communication holes 80 are formed so as to extend from the bottom of the seal groove 68 toward the top inner space 36 a in a direction parallel to the axial direction of the rotor 6. The size (diameter) of these communication holes 80 is determined by the oil flowing into the gap between the outer surface of the rotor 6 and the side housing 3 (mainly each internal space 36a flowing through the shaft through hole 46 of the rotor 6 described above). , 36b), when the pressure of the inner oil seal 76 is applied to the inner oil seal 76 by the centrifugal force of the rotor 6 and the inner oil seal 76 is pressurized. The size is such that it can be discharged into the internal space 36 a and the pressure on the inner oil seal 76 can be reduced .

Next, the main effects of the rotary piston engine according to the embodiment of the present invention will be described.
In the present embodiment, the communication groove 80 that communicates with the internal space 36 a of the rotor 6 is formed in the seal groove 68 that holds the seal member 76, so that it has entered the gap between the outer surface of the rotor 6 and the side housing 3. Oil (mainly cooling oil) can be caused to flow into the inner space 36a of the rotor 6 through the communication hole 80, thereby preventing the oil from flowing into the working chamber (combustion chamber) 5. I can do it. Therefore, the oil consumption can be reduced and the deterioration of the oil consumption can be suppressed by the amount of such inflow prevention.
In addition, since the oil that has entered the gap between the outer surface of the rotor 6 and the side housing 3 flows into the internal space 36a of the rotor 6 through the communication hole 80, the pressure on the seal member 76 by the oil is reduced. The pressing load of the seal member 76 on the side housing 3 can be reduced, whereby the amount of oil (lubricating oil) recovered from the working chamber 5 side can be increased. Further, by reducing the pressing load of the seal member 76 on the side housing 3, the friction pressure between the seal member 76 and the side housing 3 is reduced, and thereby the output of the engine 1 can be improved.

  Further, in the present embodiment, the communication hole 80 communicates with the top inner space 36a extending from the annular central boss portion 30 to a position away from the annular central boss portion 30 in the inner space 36a, 36b, and is close to the boss portion 30. Therefore, when centrifugal force is applied to the cooling oil in the internal space 36 a, it is possible to prevent such oil from flowing backward from the communication hole 80 into the seal groove 68. That is, the internal space 36a has the largest volume among the internal spaces 36a and 36b of the rotor 6, and is formed so as to spread from the annular central boss portion 30 at a position further away from the rotor radial direction. The cooling oil in the space 36 a is biased outward in the radial direction of the rotor 6 due to the centrifugal force applied when the rotor 6 rotates, so that the oil level of the cooling oil in the internal space 36 a is more radial than the communication hole 80. Since it can be maintained outside, the cooling oil in the internal space 36a can be prevented from flowing back into the communication hole 80.

  In the present embodiment, the oil seals 74 and 76 are doubled in the radial direction of the rotor 6. Of these oil seals, the communication hole 80 is formed in the seal groove 67 on the radially inner side of the rotor 6. Therefore, it is possible to prevent the oil from flowing into the working chamber 5 more effectively. Further, it is possible to effectively prevent the cooling oil in the top inner space 36a of the rotor 6 from flowing backward from the communication hole 80 to the oil seal 76 side.

  Further, in the present embodiment, the communication hole 80 is formed so as to be positioned on each straight line connecting the center of the rotor 6 and the three top portions 10 of the rotor 6, so that the oil in the top inner space 36 a Backflow from the communication hole 80 toward the oil seal 76 can be more reliably prevented.

DESCRIPTION OF SYMBOLS 1 Rotary piston engine 2 Rotor housing 3 Side housing 4 Rotor storage chamber 5 Actuation chamber 6 Rotor 8 Eccentric shaft 8a Eccentric ring 10 Top part of rotor 6 36 Internal space of rotor 6 36a Top internal space (internal space of top part of rotor)
46 Shaft through hole formed in rotor 66 Outer oil seal groove 68 Inner oil seal groove 74 Outer oil seal member 76 Inner oil seal member 80 Communication hole between inner oil seal groove and top inner space

Claims (4)

A rotary piston engine having a rotor housing, a side housing, and a rotor having three top portions and forming three working chambers accommodated in a rotor accommodating chamber surrounded by the rotor housing and the side housing. ,
Has a seal member for sealing a gap between the outer surface and the upper SL side housing of the rotor,
The rotor includes a plurality of top inner spaces that can guide oil and that are provided on the outer side in the rotor radial direction than the central boss portion provided in the rotor and in the vicinity of the top of the rotor. And a sealing groove for holding
2. A rotary piston engine according to claim 1, wherein a communication hole is formed in the seal groove of the rotor so as to communicate with a radially inner portion of the top inner space. The top inner space is provided in each of the three tops of the rotor,
2. The rotary piston engine according to claim 1, wherein a plurality of the communication holes are formed so as to communicate with top inner spaces provided inside the three tops, respectively. The seal member and the seal groove are provided double in the radial direction of the rotor,
The rotary piston engine according to claim 1 or 2, wherein the communication hole is formed in a seal groove on an inner side in the rotor radial direction.   The rotary piston engine according to any one of claims 1 to 3, wherein the communication hole is formed on each straight line connecting a center of the rotor and three top portions of the rotor.

Images