JP7435319B2 - rotary engine - Google Patents

Description

The present invention relates to a rotary engine.

Engines installed in vehicles such as automobiles include an engine body that burns a mixture of fuel and air in a working chamber and converts the pressure of the combustion gas into rotational motion to generate power, and the engine body communicates with the working chamber. The intake passage and the exhaust passage are connected so that the intake passage and the exhaust passage are connected.

The engine body is also equipped with a water pump that circulates coolant supplied to the engine body, and an oil pump that pumps oil supplied to the engine body, and the water pump and oil pump are driven by the engine output shaft. things are being done.

For example, Patent Document 1 discloses a reciprocating engine in which a water pump and an oil pump are arranged below an engine body to which an intake passage and an exhaust passage are connected, and the water pump and oil pump are driven by an engine output shaft. ing.

Japanese Patent Application Publication No. 9-13930

By the way, a rotary engine includes a rotor housing that rotatably accommodates a rotor and forms a working chamber between a trochoidal inner circumferential surface having a long axis and a short axis and an outer circumferential surface of the rotor, and The engine has an eccentric shaft that is an engine output shaft that rotates. An intake passage and an exhaust passage connected to the engine body are arranged on one side of the rotor housing in the short axis direction.

A rotary engine is more compact than a reciprocating engine because it does not have a valve mechanism, but further compactness is desired. In addition, water pumps and oil pumps that supply coolant and oil to the engine body, respectively, are used to reduce the drive loss caused by the engine output shaft and to shorten the coolant and oil supply paths. It is desirable that the rotor housing be disposed near the constituting rotor housing.

Therefore, an object of the present invention is to provide a rotary engine that can be configured compactly by arranging a water pump and an oil pump near a rotor housing.

The present invention includes a rotor, and a rotor housing that rotatably houses the rotor and forms a working chamber between an inner circumferential surface of a trochoid shape having long and short axes orthogonal to each other and an outer circumferential surface of the rotor. , a rotary engine comprising an eccentric shaft that is an output shaft that rotates as the rotor rotates, and an intake passage and an exhaust passage that are arranged on one side of the short axis direction of the rotor housing, the eccentric shaft The water pump and the oil pump are arranged such that each pump shaft extends along the axial direction of the eccentric shaft on the other side of the short axis direction of the rotor housing. The oil pump includes an engine main body having the rotor, the rotor housing, and the eccentric shaft, and an oil tank storing oil to be supplied to the engine main body, and the oil pump pumps oil from the oil tank to the engine main body. The water pump, the feed pump, and the scavenge pump each include a feed pump that pumps oil under pressure, and a scavenge pump that pumps oil from the engine main body to the oil tank, and the water pump, the feed pump, and the scavenge pump are arranged on the other side of the rotor housing in the short axis direction. A rotary engine is provided, in which a pump shaft is arranged to extend along the axial direction of the eccentric shaft .

According to the present invention, the water pump and the oil pump are arranged so that each pump shaft extends along the axial direction of the eccentric shaft on the other side in the short axis direction of the rotor housing, so that the water pump and the oil pump are arranged in the long axis direction of the rotor housing. The rotary engine can be configured more compactly in the longitudinal direction than in the case where the rotary engine is installed.

Since the water pump and the oil pump are disposed on the other side of the rotor housing in the short axis direction, the intake passage and the exhaust passage are more closely spaced than if they were disposed on the same side as the intake passage and exhaust passage in the short axis direction of the rotor housing. There is no need to avoid space for the passage and arrange the rotor housing apart from the rotor housing, and the rotary engine can be configured compactly in the short axis direction by arranging the water pump and the oil pump near the rotor housing.

Therefore, the rotary engine can be configured compactly by arranging the water pump and the oil pump near the rotor housing.

With this configuration, when a feed pump and a scavenge pump are provided, the water pump, the feed pump, and the scavenge pump are arranged on the other side of the rotor housing in the short axis direction so that each pump shaft extends along the axial direction of the eccentric shaft. Therefore, the rotary engine can be made more compact by arranging the water pump, feed pump, and scavenge pump near the rotor housing.

Preferably, the pump shafts of the water pump, the feed pump, and the scavenge pump are arranged on the same axis.

With this configuration, the water pump, feed pump, and scavenge pump are arranged on the same axis, so the water pump, feed pump, and scavenge pump are arranged on the same axis. The scavenge pump can be arranged compactly, and the rotary engine can be configured compactly.

Preferably, each pump shaft of the feed pump and the scavenge pump is formed by the same shaft.

With this configuration, each pump shaft of the feed pump and scavenge pump is formed by the same shaft, so compared to the case where each pump shaft is formed separately, the number of parts and assembly man-hours are reduced and productivity is improved. can be improved.

According to the rotary engine according to the present invention, the water pump and the oil pump can be arranged in the vicinity of the rotor housing, so that the rotary engine can be configured compactly.

1 is a perspective view of a rotary engine according to an embodiment of the present invention. It is a side view of an engine main body. FIG. 3 is a sectional view of the engine body. FIG. 3 is an explanatory diagram for explaining the flow of oil. It is a perspective view showing a chain drive mechanism. 6 is an enlarged view of the vicinity of the fuel pump shaft shown in FIG. 5. FIG. FIG. 3 is a front view showing the main parts of the chain drive mechanism. FIG. 3 is a side view showing main parts of the chain drive mechanism. It is a perspective view of a water pump. It is a figure showing a water pump sprocket. It is an explanatory view for explaining engagement of a water pump sprocket and a pump shaft.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a rotary engine according to an embodiment of the present invention, FIG. 2 is a side view of the engine main body, and FIG. 3 is a sectional view of the engine main body. As shown in FIGS. 1 to 3, a rotary engine 1 (hereinafter referred to as "engine 1" as appropriate) according to an embodiment of the present invention is installed in a vehicle such as an automobile, and includes an engine body 2 and an engine body 2. It includes an oil tank 3 that stores oil to be supplied to the main body 2. The oil tank 3 is provided independently from the engine body 2, and the engine body 2 is formed compactly.

As shown in FIG. 3, the engine body 2 includes a rotor 4 whose outer shape has a substantially triangular cross section, a rotor housing 7 that rotatably accommodates the rotor 4, and an engine output that rotates as the rotor 4 rotates. It is provided with an eccentric shaft 6 that is an axis, and is arranged so that the axis X of the eccentric shaft 6 extends in the longitudinal direction of the vehicle body.

As shown in FIGS. 1 and 2, the engine body 2 includes two rotor housings 7 arranged on the front side and the rear side of the vehicle body, and arranged between the two rotor housings 7 and on the front side and the rear side of the vehicle body. Three side housings 8 are provided, and the two rotor housings 7 and the three side housings 8 are alternately arranged and coupled.

The rotor housing 7 is formed into an annular shape, as shown in FIG. The rotor housing 7 includes a trochoid-shaped, specifically peritrochoid-shaped inner circumferential surface 7a having a long axis Y and a short axis Z that are orthogonal to each other, and the inner circumferential surface 7a is formed in a substantially elliptical shape. The engine main body 2 is supported by the vehicle body frame so that the long axis Y and the short axis Z of the rotor housing 7 extend in the vehicle vertical direction and vehicle width direction, respectively. The rotor housing 7 and the side housing 8 are also formed to have a long axis Y and a short axis Z that are orthogonal to each other.

The engine body 2 includes a rotor housing chamber 9 in which the rotor 4 is rotatably accommodated by the inner circumferential surface 7a of the rotor housing 7 and the side surface 8a of the side housing 8 disposed in the vehicle longitudinal direction of the rotor housing 7. is formed. Three working chambers 10 are formed in the rotor housing chamber 9 between the inner peripheral surface 7a of the rotor housing 7 and the outer peripheral surface 4a of the rotor 4.

An intake port 11 and an exhaust port 12 that open into the rotor accommodation chamber 9 are formed in one side housing 8 constituting the rotor accommodation chamber 9 . The intake port 11 is provided on the upper side of the vehicle body, which is one side in the long axis Y direction of the rotor housing 7, and on the right side of the vehicle body, which is one side in the short axis Z direction. The exhaust port 12 is provided on the lower side of the vehicle body, which is the other side of the rotor housing 7 in the long axis Y direction, and on the right side of the vehicle body, which is one side of the rotor housing 7 in the short axis Z direction.

The intake port 11 is connected to an intake passage 13 that supplies air to the working chamber 10, and the exhaust port 12 is connected to an exhaust passage 14 that discharges exhaust gas, which is combustion gas, from the working chamber 10. The intake passage 13 and the exhaust passage 14 are arranged on the right side of the vehicle body, which is one side of the rotor housing 7 in the short axis Z direction of the engine body 2.

An injector 15 that injects fuel into the working chamber 10 is disposed in the rotor housing 7 . The injector 15 is disposed above the vehicle body of the rotor housing 7 so that its tip portion faces the working chamber 10 . Fuel is pumped to the injector 15 from a fuel pump 20, which will be described later.

An ignition plug 16 is disposed in the rotor housing 7 to ignite a mixture of air and fuel supplied to the working chamber 10 . The spark plug 16 is configured to generate a spark in an electrode provided at its tip to ignite the air-fuel mixture. The spark plug 16 is disposed on the left side of the vehicle body of the rotor housing 7 so that its tip portion faces the working chamber 10 . In this embodiment, two spark plugs 16 are disposed in each rotor housing 7.

In the engine 1, an internal gear (not shown) is provided inside the rotor 4, and an external gear (not shown) is provided in the side housing 8. The internal gear on the rotor side and the external gear on the side housing mesh with each other, and the rotor 4 The rotor 4 is rotated planetarily relative to an eccentric shaft 6 that rotatably supports the rotor 4, and the eccentric shaft 6 rotates as the rotor 4 rotates.

The engine 1 has a rotor that is generated by intake, compression, combustion, and exhaust strokes in three working chambers 10 formed between an inner circumferential surface 7a of a rotor housing 7 and an outer circumferential surface 4a of a rotor 4. 4 is extracted from an eccentric shaft 6 which is an engine output shaft.

The engine 1 also includes a fuel pump 20 that pumps fuel to the injector 15, a water pump 30 that circulates coolant, and an oil pump 40 that pumps oil. The fuel pump 20, the water pump 30, and the oil pump 40 are arranged on the left side of the vehicle body, which is the other side of the rotor housing 7 in the short axis Z direction of the engine body 2.

The oil pump 40 includes a feed pump 41 that pumps oil from the oil tank 3 to the engine body 2, specifically to parts that require lubrication such as the eccentric shaft 6, and a feed pump 41 that pumps oil from the oil tank 3 to the engine body 2, specifically the parts that require lubrication such as the eccentric shaft 6, and the engine body 2, specifically the lower side of the engine body 2. Scavenge pumps 42 and 43 are provided to pump oil from the oil pan 2a disposed in the oil tank 3 to the oil tank 3.

FIG. 4 is an explanatory diagram for explaining the flow of oil. As shown in FIG. 4, oil is sucked up by scavenge pumps 42 and 43 from an oil pan 2a arranged on the lower side of the vehicle body of the engine main body 2 and is pumped to the oil tank 3. In the engine 1, oil is pumped to the oil tank 3 using the first scavenge pump 42 and the second scavenge pump 43.

The oil pan 2a has a bottom section formed in a substantially rectangular shape, and a front side section, a rear side section, a right side section, and a left side section that extend upward from the front side, the rear side, the right side of the vehicle, and the left side of the bottom section, respectively. , an oil storage section that stores oil is formed by the bottom surface section, the front surface section, the rear surface section, the right side surface section, and the left side surface section.

The first scavenge pump 42 is formed in the oil storage section to suck up oil from near the corner of the front side and right side of the oil pan 2a, and the second scavenge pump 43 is formed in the oil storage section to suck up oil from the oil pan 2a. It is formed so as to suck up oil from near the corner between the rear side and left side of 2a. Oil is pumped from the oil pan 2a to the oil tank 3 using the first scavenge pump 42 and the second scavenge pump 43 even when the vehicle accelerates/decelerates and turns left and right.

A thermostat 17 is interposed between the first and second scavenge pumps 42, 43 and the oil tank 3. When the oil temperature is lower than a predetermined temperature, the oil that is pumped from the oil pan 2a to the oil tank 3 is pumped to the oil tank 3 without passing through the oil cooler 18, and when the oil temperature exceeds the predetermined temperature. The thermostat 17 is opened, the oil is cooled by the oil cooler 18, and the oil is pumped into the oil tank 3.

The oil pumped and stored in the oil tank 3 is pumped by a feed pump 41 from the oil tank 3 to the engine body 2 , specifically to the parts of the engine body 2 that require lubrication. The oil pressure-fed from the feed pump 41 to the engine main body 2 is filtered by the oil filter 19 and then supplied to the engine main body 2. The oil supplied to the engine body 2 returns to the oil storage portion of the oil pan 2a.

In the engine 1, the fuel pump 20, water pump 30, and oil pump 40 are driven by the eccentric shaft 6 via a chain drive mechanism.

5 is a perspective view showing the chain drive mechanism, FIG. 6 is an enlarged view of the vicinity of the fuel pump shaft shown in FIG. 5, FIG. 7 is a front view showing main parts of the chain drive mechanism, and FIG. 8 is a chain drive mechanism. FIG.

As shown in FIGS. 5 to 8, the fuel pump 20, water pump 30, and oil pump 40 are driven by the eccentric shaft 6 via a chain drive mechanism 50. The chain drive mechanism 50 includes an endless first chain 51 that drives the fuel pump 20 and an endless second chain 52 that drives the water pump 30 and the fuel pump 20.

The oil pump 40, specifically the feed pump 41, the first scavenge pump 42, and the second scavenge pump 43, are similarly configured by trochoidal oil pumps. Each oil pump 40 has an inner rotor 45a and an outer rotor 45b having different numbers of teeth assembled eccentrically in a pump housing 44, and a pump shaft (oil pump shaft) 46 for driving the oil pump 40 is provided in the inner rotor 45a. .

In each of the oil pumps 40, the inner rotor 45a is rotationally driven by the pump shaft 46 being rotationally driven, and as the inner rotor 45a rotates, the outer rotor 45b is also rotated in the same direction. In each of the oil pumps 40, when the inner rotor 45a rotates, the volume of the space between the inner rotor 45a and the outer rotor 45b increases to suck up oil from the oil suction port, and when the inner rotor 45a further rotates, the volume of the space between the inner rotor 45a and the outer rotor 45b increases. The volume of the space between the two is reduced and the oil is forced to be fed from the oil discharge port.

In this embodiment, each of the oil pumps 40 is a two-stage oil pump. Each of the oil pumps 40 has a first rotor 45 configured by a first inner rotor 45a and a first outer rotor 45b, and a second rotor 47 configured by a second inner rotor 47a and a second outer rotor 47b in the pump housing 44. and are arranged. The first rotor 45 and the second rotor 47 are configured similarly, and a spacer 44a provided in the pump housing 44 is disposed between the first rotor 45 and the second rotor 47.

A first inner rotor 45a of the first rotor 45 and a second inner rotor 47a of the second rotor 47 are provided on the pump shaft 46, and when the pump shaft 46 is rotationally driven, the first inner rotor 45a and the second inner rotor 47a are rotationally driven. be done. When the first inner rotor 45a rotates, the first rotor 45 sucks up oil from the first oil suction port, and the oil is pumped from the first oil discharge port. Then, oil is sucked up from the second oil suction port and oil is pumped out from the second oil discharge port.

Each of the oil pumps 40 is configured such that oil pumped from a first oil discharge port is sucked up to a second oil suction port, and oil is pumped from the second oil discharge port. Each of the oil pumps 40 is constituted by a two-stage oil pump, but is not limited to this.

In the engine 1 , the oil pump 40 is arranged in the engine body 2 on the left side of the rotor housing 7 and below the vehicle body in line with the axis X direction of the eccentric shaft 6 . The feed pump 41, the first scavenge pump 42, and the second scavenge pump 43 are each arranged such that the pump shaft 46 extends in the direction of the axis X of the eccentric shaft 6, and the feed pump 41, the first scavenge pump 42, and the second scavenge pump 43 are arranged in order from the rear side of the vehicle body. Each pump shaft 46 of the feed pump 41, the first scavenge pump 42, and the second scavenge pump 43 is configured by the same shaft 46.

Each of the pump shafts 46 of the feed pump 41 , the first scavenge pump 42 , and the second scavenge pump 43 is drivingly connected to the eccentric shaft 6 via a first chain 51 and a second chain 52 so as to be driven by the eccentric shaft 6 . It has become.

FIG. 9 is a perspective view of the water pump. As shown in FIG. 9, the water pump 30 forcibly circulates the coolant supplied to the engine body 2, and includes a pump housing 31 and a pump shaft (water pump) rotatably supported by the pump housing 31. a shaft) 36 and an impeller 32 disposed within the pump housing 31 and provided on the pump shaft 36.

The impeller 32 of the water pump 30 is rotated by rotation of the pump shaft 36, and the rotation of the impeller 32 supplies and circulates the coolant to the engine body 2. The coolant supplied to the engine body 2 is guided to the radiator after cooling the engine body 2, and after being cooled by the radiator, it is supplied to the engine body 2 again by the water pump 30.

In the engine 1, the water pump 30 is disposed in the engine body 2 on the left side of the rotor housing 7 and below the vehicle body in the direction of the axis X of the eccentric shaft 6. The water pump 30 is arranged in front of the oil pump 40, specifically the feed pump 41, the first scavenge pump 42, and the second scavenge pump 43.

The water pump 30 is arranged so that the pump shaft 36 extends in the direction of the axis X of the eccentric shaft 6, and is arranged in front of the feed pump 41, the first scavenge pump 42, and the second scavenge pump 43 in the vehicle body. The axis C2 of the pump shaft 36 of the water pump 30 and the axis C3 of the pump shaft 46 of the oil pump 40 are arranged on the same axis.

The fuel pump 20 is a mechanical high-pressure fuel pump 20 that pumps fuel to the injector 15. As shown in FIG. 6, the high-pressure fuel pump 20 includes a pump body part 21 and a pump mounting part 22, and the volume of a pump chamber (not shown) formed in the pump body part 21 changes to allow the fuel tank (not shown) is pressurized and fed to the injector 15 under pressure.

A pump body 21 of the fuel pump 20 is connected to a supply passage 23 through which fuel is supplied from the fuel tank, and also connected to a supply passage 24 through which fuel is force-fed to the injector 15. In the fuel pump 20, the plunger 25 (see FIG. 7), which is formed in a substantially cylindrical shape, moves in the direction of the axis C4 within the pump body 21, thereby increasing the pressure of the fuel and pumping the fuel to the injector 15. ing.

The plunger 25 of the fuel pump 20 is biased by a pump shaft (fuel pump shaft) 26 that drives the fuel pump 20 by a spring 28 disposed within a substantially cylindrical sleeve 27 provided at the bottom of the pump body 21. ing. The pump shaft 26 is provided with a cam portion 29 having a predetermined lift relative to the circular base surface.

In the fuel pump 20, when the pump shaft 26 is rotationally driven, the cam portion 29 is rotated, and the plunger 25 is moved upward in the direction of the axis C4 by the cam portion 29, and the volume of the pump chamber is changed and the injector 15 is rotated. Fuel is pumped.

In the engine 1, the fuel pump 20 is disposed in the engine body 2 on the left side of the rotor housing 7 and above the vehicle body in the direction of the axis X of the eccentric shaft 6, and the pump shaft 26 is disposed so as to extend in the direction of the axis X of the eccentric shaft 6. has been done.

The fuel pump 20 is arranged above the water pump 30 and the oil pump 40 in the vehicle body, and is spaced apart from the water pump 30 and the oil pump 40 in the long axis Y direction of the rotor housing 7 and in the short axis Z direction of the rotor housing 7. are placed in overlapping positions.

As described above, the fuel pump 20, water pump 30, and oil pump 40 are drivingly connected to the eccentric shaft 6 via the chain drive mechanism 50. The eccentric shaft 6 is rotatably supported by the engine body 2. The pump shafts 26, 36, and 46 of the fuel pump 20, water pump 30, and oil pump 40 are also rotatably supported.

As shown in FIG. 5, the eccentric shaft 6 is provided with an annular eccentric sprocket 6a on the front side of the vehicle body. A first annular fuel pump sprocket 26a is provided on the pump shaft 26 of the fuel pump 20 at a position corresponding to the eccentric sprocket 6a of the eccentric shaft 6 on the front side of the vehicle body.

The pump shaft 26 of the fuel pump 20 is also provided with an annular second fuel pump sprocket 26b on the rear side of the vehicle body. The cam portion 29 provided on the pump shaft 26 of the fuel pump 20 is provided between the first fuel pump sprocket 26a and the second fuel pump sprocket 26b in the axial direction of the pump shaft 26.

The pump shaft 36 of the water pump 30 is provided with an annular water pump sprocket 36a at a position corresponding to the second fuel pump sprocket 26b. The water pump sprocket 36a also serves as an oil pump sprocket 36a provided on the pump shaft 46 of the oil pump 40 at a position corresponding to the second fuel pump sprocket 26b.

FIG. 10 is a diagram showing a water pump sprocket. FIG. 10(a) is a perspective view of the water pump sprocket, and FIG. 10(b) is a sectional view of the water pump sprocket taken along the line Y10b-Y10b in FIG. 10(a). As shown in FIGS. 10(a) and 10(b), the water pump sprocket 36a has a first boss portion 33 extending substantially cylindrical in the direction of the axis C3 of the pump shaft 46 of the oil pump 40 on the inner peripheral side. , a second boss portion 34 extending in a substantially cylindrical shape in the direction of the axis C2 of the pump shaft 36 of the water pump 30 is provided.

The first boss portion 33 is formed with a first groove portion 35 recessed in the shape of a cylinder with a bottom from the rear side of the vehicle body to the front side of the vehicle body. It has a side surface portion 35b formed in.

A shaft insertion hole 39 is formed in the bottom surface 35a of the first groove 35, and an engagement recess 35c into which the pump shaft 46 of the oil pump 40 is engaged is formed in the side surface 35b of the first groove 35. The engagement recess 35c is recessed radially outward from the side surface 35b of the first groove 35 and has a substantially rectangular shape when viewed from the axial direction. Two engagement recesses 35c are formed in the side surface portion 35b, distributed at equal intervals in the circumferential direction.

The first boss portion 33 is also formed with a second groove portion 37 that is recessed in a cylindrical shape with a bottom from the front side of the vehicle body to the rear side of the vehicle body. The second groove portion 37 is formed similarly to the first groove portion 35. The second groove portion 37 has a bottom portion 37a formed in a substantially circular shape and a side portion 37b formed in a substantially cylindrical shape.

A shaft insertion hole 39 passes through the bottom surface 37a of the second groove 37, and an engagement recess 37c into which the pump shaft 36 of the water pump 30 is engaged is formed in the side surface 37b of the second groove 37. The engagement recess 37c is recessed radially outward from the side surface 37b of the second groove 37 and has a substantially rectangular shape when viewed from the axial direction. Two engaging recesses 37c are formed in the side surface portion 37b, distributed at equal intervals in the circumferential direction.

FIG. 11 is an explanatory diagram for explaining the engagement between the water pump sprocket and the pump shaft. As shown in FIG. 11, an engagement member 48 that engages with the water pump sprocket 36a is fixed to the front side of the vehicle body of the pump shaft 46 of the oil pump 40.

The engagement member 48 includes a cylindrical portion 48a that is fixed to the pump shaft 46 and formed in a substantially cylindrical shape, and a protrusion portion 48b that protrudes radially outward from the cylindrical portion 48a in a substantially rectangular shape when viewed from the axial direction. There is. The engagement member 48 has two protrusions 48b that correspond to the engagement recesses 35c of the first groove 35 and are equally spaced apart in the circumferential direction, and a cylindrical part 48a that protrudes from the front side of the vehicle body of the pump shaft 46. It is attached to the pump shaft 46 as shown in FIG.

The pump shaft 46 of the oil pump 40 is inserted into the first groove portion 35 of the first boss portion 33 provided on the water pump sprocket 36a with the front side of the vehicle body inserted into the shaft insertion hole 39, and the engagement member 48 is inserted into the first groove portion 35 of the first boss portion 33 provided on the water pump sprocket 36a. The engaging member 48 is engaged such that the cylindrical portion 48a of the engaging member 48 is fitted into the side surface portion 35b with the protruding portion 48b being engaged with the engaging recess 35c, and the cylindrical portion 48a of the engaging member 48 is engaged with the water pump sprocket 36a. Non-rotatably connected.

As shown in FIG. 9, the water pump 30 is formed such that the rear side of the vehicle body of a pump shaft 36 fixed to an impeller 32 disposed within the pump housing 31 protrudes from the pump housing 31. An engagement member 38 that engages with the water pump sprocket 36a is fixed to the rear side of the vehicle body of the pump shaft 36 of the water pump 30.

The engagement member 38 includes a cylindrical portion 38a that is fixed to the pump shaft 36 and formed in a substantially cylindrical shape, and a protrusion portion 38b that protrudes radially outward from the cylindrical portion 38a in a substantially rectangular shape when viewed from the axial direction. There is. The engagement member 38 has two protruding portions 38b that correspond to the engagement recesses 37c of the second groove portion 37 and are equally spaced apart in the circumferential direction, and a cylindrical portion 38a that protrudes from the rear side of the vehicle body of the pump shaft 36. It is attached to the pump shaft 36 as shown in FIG.

The pump shaft 36 of the water pump 30 is inserted into the second groove portion 37 of the first boss portion 33 provided on the water pump sprocket 36a, and the rear side of the pump shaft 36 is inserted into the shaft insertion hole 39, and the engagement member 38 is inserted into the second groove portion 37 of the first boss portion 33 provided on the water pump sprocket 36a. The engaging member 38 is engaged such that the cylindrical portion 38a of the engaging member 38 is fitted into the side surface portion 37b with the protruding portion 38b being engaged with the engaging recess 37c, and the cylindrical portion 38a of the engaging member 38 is engaged with the water pump sprocket 36a. Non-rotatably connected.

In this way, the pump shaft 36 of the water pump 30 and the pump shaft 46 of the oil pump 40 are connected to the water pump sprocket 36a, and as the water pump sprocket 36a rotates, the pump shafts 36 of the water pump 30 and the oil pump 40 are connected to the water pump sprocket 36a. , 46 are rotated integrally. It is also possible to integrally mold at least one of the pump shaft 36 of the water pump 30 and the pump shaft 46 of the oil pump 40 on the water pump sprocket 36a.

In the engine 1, the pump shafts 26, 36, 46 of the fuel pump 20, water pump 30, and oil pump 40 are arranged parallel to the eccentric shaft 6, as shown in FIG. A first chain 51 is wound around the eccentric sprocket 6a provided on the eccentric shaft 6 and the first fuel pump sprocket 26a provided on the pump shaft 26 of the fuel pump 20. A second chain 52 is wound around the second fuel pump sprocket 26b and the water pump sprocket 36a provided on the pump shaft 36 of the water pump 30.

A pump shaft 26 of the fuel pump 20 is drivingly connected to the eccentric shaft 6 via a first chain 51. The pump shaft 36 of the water pump 30 is drivingly connected to the eccentric shaft 6 via a first chain 51 and a second chain 52. The pump shaft 46 of the oil pump 40 connected to the water pump sprocket 36a is also drivingly connected to the eccentric shaft 6 via a first chain 51 and a second chain 52.

The first chain 51 is wound only around the eccentric sprocket 6a and the first fuel pump sprocket 26a, and the second chain 52 is wound only around the second fuel pump sprocket 26b and the water pump sprocket 36a. A roller chain is used as the first chain 51 and the second chain 52. Tension may be applied to the first chain 51 and the second chain 52 by a tension device.

As shown in FIG. 7, in the engine 1, in an orthogonal plane perpendicular to the axis X of the eccentric shaft 6, a straight line L1 connecting the axis X of the eccentric shaft 6 and the axis C1 of the pump shaft 26 of the fuel pump 20, and the eccentric shaft A straight line L2 connecting the axis X of the fuel pump 6 and the axes C2 and C3 of the pump shafts 36 and 46 of the water pump 30 and the oil pump 40 is a straight line L2 that connects the axis X of It is provided so as to be substantially symmetrical with respect to the axial direction C4 of the plunger 25, which is the direction of action.

The first chain 51 and the second chain 52 are arranged in a side housing 8 arranged on the front side of the eccentric shaft 6 in the vehicle body. The first chain 51 is arranged on the front side of the vehicle body of the side housing 8, and the second chain 52 is arranged on the rear side of the vehicle body of the side housing 8. A first chain cover 2b is attached to the side housing 8 so as to cover the first chain 51, and a second chain cover 2c is attached to the side housing 8 so as to cover the second chain 52.

In this embodiment, each of the oil pumps 40 is a trochoidal oil pump, but it is also possible to use another oil pump having a pump shaft for driving the pump. In the engine 1, oil is pumped to the oil tank 3 using a first scavenge pump 42 and a second scavenge pump 43, but oil is pumped to the oil tank 3 using one scavenge pump 42. You can do it like this.

As described above, the rotary engine 1 according to the present embodiment includes the rotor 4, the rotor housing 7, the eccentric shaft 6, the intake passage 13 and the exhaust passage 14 arranged on one side of the rotor housing 7 in the short axis Z direction. It also includes a water pump 30 and an oil pump 40 driven by an eccentric shaft 6.

The water pump 30 and the oil pump 40 are disposed on the other side of the rotor housing 7 in the short axis Z direction so that each pump shaft 36, 46 extends along the axial direction of the eccentric shaft 6, so that the long axis of the rotor housing 7 Compared to the case where the rotary engine 1 is arranged in the Y direction, the rotary engine 1 can be configured more compactly in the long axis Y direction.

Since the water pump 30 and the oil pump 40 are arranged on the other side of the rotor housing 7 in the short axis Z direction, when they are arranged on the same side as the intake passage 13 and the exhaust passage 14 in the short axis Z direction of the rotor housing 7, In contrast, it is not necessary to avoid the space for the intake passage 13 and the exhaust passage 14 and arrange them apart from the rotor housing 7, and the water pump 30 and the oil pump 40 can be arranged near the rotor housing 7 to improve the rotary engine 1. can be configured compactly in the short axis Z direction.

Therefore, the rotary engine 1 can be configured compactly by arranging the water pump 30 and the oil pump 40 near the rotor housing 7.

Furthermore, the pump shafts 36 and 46 of the water pump 30 and the oil pump 40 are arranged on the same axis. As a result, the water pump 30 and the oil pump 40 can be arranged more compactly than in the case where the pump shafts 36 and 46 are not arranged on the same axis, and the rotary engine 1 can be configured more compactly.

The oil pump 40 also includes a feed pump 41 that pumps oil from the oil tank 3 to the engine body 2, and scavenge pumps 42 and 43 that pumps oil from the engine body 2 to the oil tank 3. The feed pump 41 and the scavenge pumps 42 and 43 are arranged on the other side of the rotor housing 7 in the short axis Z direction so that each pump shaft 36 and 46 extends along the axial direction of the eccentric shaft 6.

As a result, when the feed pump 41 and the scavenge pumps 42, 43 are provided, the water pump 30, the feed pump 41, and the scavenge pumps 42, 43 have their respective pump shafts 36, 46 on the other side in the short axis Z direction of the rotor housing 7. Since they are arranged to extend along the axial direction of the eccentric shaft 6, the water pump 30, feed pump 41, and scavenge pumps 42, 43 can be arranged near the rotor housing 7, making it possible to make the rotary engine 1 more compact. .

Further, the pump shafts 36, 46 of the water pump 30, the feed pump 41, and the scavenge pumps 42, 43 are arranged on the same axis. As a result, the water pump 30, the feed pump 41, and the scavenge pumps 42, 43 can be arranged more compactly than when the pump shafts 36, 46 are not arranged on the same axis, and the rotary engine 1 can be made more compact. Can be configured.

Further, each pump shaft 46 of the feed pump 41 and the scavenge pumps 42, 43 is formed by the same shaft. Thereby, compared to the case where the pump shafts 46 of the feed pump 41 and the scavenge pumps 42 and 43 are formed separately, it is possible to reduce the number of parts and the number of assembly steps and improve productivity.

The present invention is not limited to the illustrated embodiments, and various improvements and changes in design are possible without departing from the gist of the present invention.

As described above, according to the present invention, it is possible to configure a rotary engine compactly by arranging a water pump and an oil pump near the rotor housing. It may be suitably used in the manufacturing industry field.

1 Rotary engine 2 Engine body 3 Oil tank 4 Rotor 6 Eccentric shaft 7 Rotor housing 13 Intake passage 14 Exhaust passage 30 Water pump 40 Oil pump 41 Feed pump 42, 43 Scavenge pump

Claims (3)

a rotor; a rotor housing that rotatably accommodates the rotor and forms a working chamber between an inner circumferential surface of a trochoid shape having long and short axes orthogonal to each other and an outer circumferential surface of the rotor; A rotary engine comprising an eccentric shaft that is an output shaft that rotates with rotation, and an intake passage and an exhaust passage that are arranged on one side of the short axis direction of the rotor housing,
comprising a water pump and an oil pump driven by the eccentric shaft,
The water pump and the oil pump are arranged on the other side of the rotor housing in the short axis direction so that each pump shaft extends along the axial direction of the eccentric shaft ,
an engine body including the rotor, the rotor housing, and the eccentric shaft;
an oil tank that stores oil to be supplied to the engine body;
Equipped with
The oil pump includes a feed pump that pumps oil from the oil tank to the engine main body, and a scavenge pump that pumps oil from the engine main body to the oil tank,
The water pump, the feed pump, and the scavenge pump are arranged on the other side of the rotor housing in the short axis direction so that each pump shaft extends along the axial direction of the eccentric shaft.
A rotary engine characterized by: Each pump shaft of the water pump, the feed pump, and the scavenge pump is arranged on the same axis,
The rotary engine according to claim 1 , characterized in that: Each pump shaft of the feed pump and the scavenge pump is formed by the same shaft.
The rotary engine according to claim 1 or claim 2 , characterized in that:

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