JP2017186930A - Saddle riding type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve energy efficiency in driving a turbine of a supercharger with energy of exhaust gas, and quickly activate catalyst with heat of the exhaust gas.SOLUTION: A saddle riding type vehicle includes: a supercharger 25 configured to operate a compressor with energy of exhaust gas discharged from an engine 11, and compress air for fuel combustion; a catalyst device 41 including catalyst for purifying exhaust gas flown out from a turbine part 26 of the supercharger 25; and a cover 51 covering the turbine part 26 and the catalyst device 41. The turbine part 26 and the catalyst device 41 are arranged adjacently to each other in one continuous space formed in the cover 51.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a straddle-type vehicle equipped with an engine with a supercharger and a catalyst.

  A straddle-type vehicle such as a motorcycle equipped with a supercharged engine is widely known. The supercharger uses the energy of the exhaust from the engine to drive the turbine, thereby operating the compressor and compressing the air for fuel combustion. By supplying the air compressed by the supercharger to the combustion chamber of the engine, the charging efficiency of the engine can be improved and the output can be increased.

  On the other hand, Patent Document 1 below describes a saddle type motorcycle in which a catalyst is provided in an upstream exhaust pipe close to an exhaust port in an exhaust pipe extending from an exhaust port of an engine. It is described that it is activated quickly under the action of the exhaust gas and the purification efficiency is increased.

Japanese Patent Laying-Open No. 2015-175241

  By the way, a supercharger is arrange | positioned in the middle of an exhaust pipe in order to drive a turbine using the energy of exhaust_gas | exhaustion. On the other hand, the catalyst is disposed in the middle of the exhaust pipe so as to quickly increase the temperature of the catalyst to a temperature at which the catalyst is activated by utilizing the heat of the exhaust. Therefore, in a straddle-type vehicle equipped with an engine with a supercharger, both the supercharger and the catalyst are arranged in the middle of the exhaust pipe.

  In this case, it is possible to improve both the energy efficiency when driving the turbocharger turbine using the energy of the exhaust gas and the rapid activation of the catalyst using the heat of the exhaust gas. It is necessary to determine the arrangement of the feeder and the catalyst.

  The present invention has been made in view of the above-described problems, for example, and an object of the present invention is to improve the energy efficiency when driving the turbocharger turbine using the energy of the exhaust gas, and to reduce the heat of the exhaust gas. An object of the present invention is to provide a straddle-type vehicle that can achieve both rapid activation of a utilized catalyst.

  In order to solve the above-described problems, a saddle-ride type vehicle according to the present invention includes a turbine housing in which a turbine is accommodated, and a turbine unit that rotates the turbine by circulating exhaust gas discharged from an engine into the turbine housing. And a turbocharger that operates by rotation of the turbine and compresses fuel combustion air supplied to the engine, and a catalyst device that includes a catalyst for purifying exhaust gas flowing out of the turbine housing And a cover that covers the turbine part and the catalyst device, wherein the turbine part and the catalyst device are arranged next to each other in one continuous space formed in the cover. And

  ADVANTAGE OF THE INVENTION According to this invention, both the improvement of the energy efficiency at the time of driving the turbine of a supercharger using the energy of exhaust gas, and the quick activation of the catalyst using the heat of exhaust gas can be aimed at.

It is explanatory drawing which looked at the front part of the saddle-ride type vehicle by the Example of this invention from the front right upper part. It is explanatory drawing which looked at the front part of the saddle riding type vehicle by the Example of this invention from the right side. It is explanatory drawing which looked at the engine etc. in the saddle-ride type vehicle by the Example of this invention from the front right upper part. It is explanatory drawing which looked at the supercharger, catalyst apparatus, cover, etc. in the saddle riding type vehicle according to the embodiment of the present invention from the upper right front. It is explanatory drawing which looked at the supercharger in FIG. 4, a catalyst apparatus, a cover, etc. from the front. It is explanatory drawing which looked at the supercharger in FIG. 4, a catalyst apparatus, a cover, etc. from upper direction. It is explanatory drawing which looked at the supercharger, catalyst apparatus, cover, etc. in FIG. 4 from the lower left. It is explanatory drawing which looked at the supercharger, the catalyst apparatus, etc. in the saddle riding type vehicle by the Example of this invention from the upper right front. FIG. 7 is a cross-sectional view of the catalyst device, the cover, and the like in the saddle riding type vehicle according to the embodiment of the present invention when viewed from the direction of arrows IX-IX in FIG.

  A straddle-type vehicle according to an embodiment of the present invention includes a turbine housing in which a turbine is accommodated, and operates by rotating the turbine, and a turbine section that rotates the turbine by circulating exhaust gas discharged from the engine into the turbine housing. And a turbocharger having a compressor for compressing air for fuel combustion supplied to the engine, a catalyst device having a catalyst for purifying exhaust gas flowing out from the turbine housing, and a cover for covering the turbine portion and the catalyst device The turbine section and the catalyst device are arranged adjacent to each other in one continuous space formed in the cover.

  According to this embodiment of the present invention, since the turbine part and the catalyst device are arranged next to each other in one continuous space formed in the cover, the exhaust gas transmitted to both the turbine part and the catalyst device. The amount of heat can be increased. Thereby, both the improvement of the energy efficiency at the time of driving the turbine of a supercharger using the energy of exhaust gas, and the rapid activation of the catalyst using the heat of exhaust gas can be aimed at.

  Moreover, according to this embodiment of the present invention, the cover that covers the turbine section and the catalyst device can be a single simple cover. As a result, the cover can be reduced in size, and therefore the space for providing the cover can be reduced. Therefore, the saddle riding type vehicle can be reduced in size. Further, the cover can be lightened, and the weight of the saddle riding type vehicle can be reduced.

  In the straddle-type vehicle according to the above-described embodiment of the present invention, the supercharger and the catalyst device are arranged such that the exhaust path from the outlet of the turbine housing to the outlet of the catalyst device is linear. Preferably it is.

  According to this embodiment of the present invention, the turbine section and the catalyst device can be brought close to each other, and the exhaust path can be shortened. As a result, the amount of heat transferred from the turbine section to the catalyst can be increased to further accelerate the activation of the catalyst. Moreover, a supercharger and a catalyst apparatus can be arrange | positioned compactly.

  In the straddle-type vehicle according to the above-described embodiment of the present invention, it is preferable that the compressor unit, the turbine unit, and the catalyst device are arranged in this order on the same straight line.

  According to this embodiment of the present invention, the turbine section and the catalyst device can be brought close to each other, and the exhaust path between the turbine section and the catalyst apparatus can be made straight, thereby shortening the exhaust path. be able to.

  In the straddle-type vehicle according to the above-described embodiment of the present invention, it is preferable that the supercharger and the catalyst device are arranged in front of the engine and are arranged in the left-right direction of the straddle-type vehicle.

  According to this embodiment of the present invention, since the supercharger and the catalyst device are arranged in front of the engine, both the turbine unit and the catalyst device are brought close to the exhaust port opened in front of the cylinder head of the engine. be able to. Thereby, the heat of exhaust can be efficiently transmitted to both the turbine section and the catalyst. Further, since the supercharger and the catalyst device are arranged in the left-right direction of the saddle riding type vehicle, the supercharger and the catalyst device can be arranged in a compact manner.

  In the straddle-type vehicle according to the above-described embodiment of the present invention, it is preferable that the cover is formed in a cylindrical shape, and the axis of the cover extends in the left-right direction of the straddle-type vehicle.

  According to this embodiment of the present invention, when the supercharger and the catalyst device are arranged side by side in the left-right direction of the saddle riding type vehicle, the cover that covers the turbine unit and the catalyst device has a small and simple shape. It can be.

  Further, the saddle riding type vehicle according to the above-described embodiment of the present invention further includes a radiator for cooling the cooling water for cooling the engine, and the cover is disposed below the radiator and behind the front surface of the radiator. preferable.

  According to this embodiment of the present invention, the turbine section and the catalyst device can be arranged by effectively utilizing the empty space below the radiator in front of the engine. Further, the length of the saddle riding type vehicle can be shortened by bringing the turbine section and the catalyst device closer to the engine.

  In the straddle-type vehicle according to the embodiment of the present invention described above, a link member that connects a waste gate valve that adjusts the amount of exhaust gas flowing from the engine to the turbine housing and an actuator that controls the waste gate valve in the cover. It is preferable that a hole or a cut-out portion is formed for passing through.

  According to this embodiment of the present invention, even when the waste gate valve and the actuator are separated from each other and the link member that connects them protrudes from the turbine portion or the like, the turbine portion and the catalyst can be covered with the cover.

  1 and 2 show a front portion of a saddle-ride type vehicle according to an embodiment of the present invention. Specifically, FIG. 1 is a view of the front portion of the saddle riding type vehicle as viewed from the upper right front, and FIG. 2 is a view of the front portion of the saddle riding type vehicle as seen from the right side. In the following description, the directions of up, down, left, right, front, and rear are based on the driver sitting on the driving seat of the saddle riding type vehicle, and specifically, as indicated by the arrows in each figure. It is.

  In FIG. 1, a straddle-type vehicle 1 according to an embodiment of the present invention is, for example, a motorcycle. The saddle riding type vehicle 1 includes a body frame 2, and the body frame 2 includes a head pipe 3 and a main frame 4. The vehicle body frame 2 further includes a frame that supports a fuel tank, an operation seat, and the like, a frame that supports a swing arm, and the like, which are not shown. A steering shaft is rotatably supported in the head pipe 3, and a front fork 6 is supported on the steering shaft via a bracket. A front wheel 7 is rotatably supported on the front fork 6. The steering shaft supports a handle via a bracket, which is not shown. Further, an engine 11 is provided in the middle part in the front-rear direction of the saddle riding type vehicle 1. The engine 11 is supported by the body frame 2. As shown in FIG. 2, a radiator 9 is provided in front of the engine 11. The radiator 9 is a device that cools cooling water that cools the engine 11 by using traveling wind or the like. Although not shown, the straddle-type vehicle 1 includes a swing arm that is swingably supported by the body frame 2 at the lower rear of the engine 11, and a rear wheel that is rotatably supported by the swing arm. A fuel tank and an operation seat provided above the engine 11 are provided.

  FIG. 3 shows the engine 11 and supercharger 25 of the saddle riding type vehicle 1. As shown in FIG. 3, in this embodiment, the engine 11 is a water-cooled type, and is an in-line two-cylinder engine in which two cylinders are arranged in a row along a crankshaft that is orthogonal to the traveling direction of the vehicle. is there. The engine 11 includes a crankcase 12, a cylinder 13, a cylinder head 14, and a cylinder head cover 15. The crankcase 12 is disposed in the lower part of the engine 11 and houses a crankshaft and the like. The cylinder 13 is provided on the upper side of the front portion of the crankcase 12, and a piston or the like is accommodated therein. The cylinder head 14 is provided on the upper side of the cylinder 13 and accommodates an intake valve, an exhaust valve, and the like. The cylinder head cover 15 is a cover that covers the upper side of the cylinder head 14. Further, a drive system device such as a clutch and a transmission is provided at the rear portion of the crankcase 12. Further, in front of the engine 11, specifically, in front of the cylinder 13, a supercharger 25 that operates the compressor using the energy of the exhaust gas exhausted from the engine 11 and compresses the air for fuel combustion is provided. It has been.

  Although not shown, the saddle riding type vehicle 1 includes an air cleaner, an intercooler, a surge tank, a throttle device, and the like as intake system components or devices. The air cleaner is a device that is connected to the front stage of the compressor section 30 of the supercharger 25 and purifies air for fuel combustion. The intercooler is a device that cools the air, which has been compressed by the compressor unit 30 of the supercharger 25 and whose temperature has risen, using traveling air or the like. The surge tank is a device that temporarily stores the air cooled by the intercooler and rectifies the air. The throttle device is a device that adjusts the amount of air supplied to the intake port of the engine 11 in accordance with the accelerator operation. An injector is provided in the vicinity of the intake port of the engine 11.

  The straddle-type vehicle 1 includes a catalyst device 41 and a silencer as exhaust system components or devices. As shown in FIG. 3, the catalyst device 41 is a device that is connected to the rear stage of the turbine unit 26 of the supercharger 25 and purifies the exhaust of the engine 11. Although not shown, the silencer is provided at the rear portion of the saddle riding type vehicle 1 and has a function of reducing exhaust noise. The catalyst device 41 and the silencer are connected by an exhaust delivery pipe 57.

  Further, as shown in FIG. 3, the saddle riding type vehicle 1 collects the exhaust manifold 23, the supercharger 25, and the catalyst device 41 and arranges them in front of the engine 11, and the turbine unit 26 and the catalyst of the supercharger 25. The device 41 is covered with a cover 51. Hereinafter, this configuration is referred to as an “exhaust unit”, and a reference numeral 21 is given thereto. 4 to 9 show details of the exhaust unit 21. FIG. Specifically, FIG. 4 is a diagram of the exhaust unit 21 as viewed from the upper right front, FIG. 5 is a diagram of the exhaust unit 21 as viewed from the front, and FIG. 6 is a diagram of the exhaust unit 21 as viewed from above. 7 is a view of the exhaust unit 21 as viewed from the lower left. FIG. 8 is a view showing a state where the cover 51 is removed from the exhaust unit 21. 9 is a cross-sectional view of a part of the turbine unit 26, a part of the catalyst device 41, the cover 51, and the like in the exhaust unit 21 as seen from the direction of arrows IX-IX in FIG.

  As shown in FIG. 8, the supercharger 25 includes a turbine unit 26 and a compressor unit 30. The turbocharger 25 is arranged so that the turbine part 26 and the compressor part 30 are arranged in the left-right direction in front of the cylinder 13, and the turbine part 26 is on the right side of the compressor part 30.

  The turbine unit 26 is a part that generates power for operating the compressor unit 30 by using the energy of the exhaust gas discharged from the engine 11. The turbine section 26 includes a turbine housing 27 and a turbine wheel 28 (see FIG. 9) accommodated in the turbine housing 27. The turbine housing 27 is formed in a substantially cylindrical shape, and the axis of the turbine housing 27 extends in the left-right direction. A flange 29 for attaching the catalyst device 41 is formed on the outer peripheral side of the right portion of the turbine housing 27.

  Further, in the turbine portion 26 in the present embodiment, the exhaust manifold 23 is integrally formed with the turbine housing 27. That is, two exhaust pipes are formed on one end side of the exhaust manifold 23, and the inlets of these exhaust pipes are connected to two exhaust ports formed on the front surface of the cylinder 13 (cylinder block), respectively. On the other hand, two exhaust pipes are connected to the other end side of the exhaust manifold 23 to form one pipe portion, and the other end portion of the pipe portion is integrally connected to the turbine housing 27. As a result, the inlet existing in the outer peripheral portion of the turbine housing 27 is integrated with the outlet of the exhaust manifold 23. By integrally forming the exhaust manifold 23 in the turbine housing 27, the supercharger 25 and the exhaust manifold 23 can be reduced in size.

  As shown in FIG. 9, the outlet 27 </ b> A of the turbine housing 27 is disposed at the right part of the turbine housing 27 and opens rightward in the axial direction, and the center of the outlet 27 </ b> A is substantially the same as the axial center of the turbine housing 27. I'm doing it. The exhaust discharged from each exhaust port flows into the turbine housing 27 through the exhaust manifold 23 and then flows out from the outlet 27 </ b> A of the turbine housing 27. The turbine wheel 28 is rotated by the energy of the exhaust.

  On the other hand, the compressor section 30 is a section that operates using the power generated by the turbine section 26 and compresses fuel combustion air. The compressor unit 30 includes a compressor housing 31 and a compressor impeller (not shown) accommodated in the compressor housing 31. The compressor housing 31 is formed in a substantially cylindrical shape, and the axis of the compressor housing 31 extends in the left-right direction and coincides with the axis of the turbine housing 27. Further, the inlet 31A of the compressor housing 31 is disposed on the left side of the compressor housing 31 and opens leftward in the axial direction. Although not shown, an air cleaner is connected to the inlet 31A of the compressor housing 31 via a pipe. Further, the outlet 31 </ b> B of the compressor housing 31 is open to the outer periphery of the compressor housing 31. Although not shown, an intercooler is connected to the outlet 31B of the compressor housing 31 via a pipe.

  The turbine section 26 is provided with a waste gate valve (not shown) that adjusts the amount of exhaust gas that flows into the turbine housing 27 from the engine 11 and is used for rotationally driving the turbine wheel 28. As shown in FIG. 7, the supercharger 25 is provided with an actuator 33 that controls the opening and closing of the waste gate valve. The actuator 33 is arranged at the lower left of the compressor housing 31. Further, the turbocharger 25 is provided with a link member 34 that transmits the operation of the actuator 33 to the waste gate valve. One end of the link member 34 is connected to the lower part of the turbine part 26, the other end is connected to the actuator 33, and extends from the lower part of the turbine part 26 toward the actuator 33 in the lower left direction.

  As shown in FIG. 9, the catalyst device 41 includes a catalyst 42 and a catalyst case 43. The catalyst 42 has a metal honeycomb structure, for example, and is formed in a cylindrical shape as a whole. Further, the axial direction of the catalyst 42 is the exhaust flow direction. The catalyst case 43 is a case for accommodating the catalyst 42 and is formed in a cylindrical shape. The catalyst 42 is supported in the catalyst case 43 via a catalyst support member 44. Further, the catalyst 42 is positioned so that the axis of the catalyst case 43 and the axis of the catalyst 42 coincide.

  An inflow port 43 </ b> A is formed in the left part of the catalyst case 43, the inflow port 43 </ b> A opens to the left, and the center of the inflow port 43 </ b> A coincides with the axis of the catalyst case 43. In addition, an outlet 43B is formed on the right portion of the catalyst case 43, the outlet 43B opens to the right, and the center of the outlet 43B coincides with the axis of the catalyst case 43. Further, the catalyst support member 44 provided on the inlet side of the catalyst case 43 functions as a duct that guides the exhaust gas flowing into the inlet 43A of the catalyst case 43 to the catalyst 42. The catalyst support member 44 provided on the outflow side of the catalyst case 43 functions as a duct that guides the exhaust gas flowing through the catalyst 42 to the outflow port 43B of the catalyst case 43. The exhaust gas flowing in from the inlet 43A of the catalyst case 43 flows through the catalyst 42, is purified by this, and is discharged from the outlet 43B of the catalyst case 43.

  A flange 45 for attaching the catalyst device 41 to the turbine housing 27 is formed on the outer peripheral side of the left portion of the catalyst case 43.

  Further, as shown in FIG. 8, a cover support portion 46 for supporting the cover 51 is provided on the outer peripheral portion of the catalyst case 43. For example, a total of four cover support portions 46 are provided. Of these, the two cover support portions 46 are arranged on the left portion of the catalyst case 43 at an interval of 180 degrees in the circumferential direction, and the remaining two cover support portions 46 are arranged on the right portion of the catalyst case 43. They are arranged at intervals of 180 degrees in the circumferential direction. In FIG. 8, only two of these four cover support portions 46 are shown. Further, each cover support portion 46 protrudes radially outward from the outer peripheral surface of the catalyst case 43, and a bolt hole is formed at the center of the tip surface of each cover support portion 46.

  As shown in FIG. 8, the catalyst case 43 is attached to the right portion of the turbine housing 27 by, for example, fixing the flanges 29 and 45 to each other by a fixing member such as a bolt. By forming flanges 29 and 45 on the turbine housing 27 and the catalyst case 43, respectively, and fixing them, the turbine part 26 and the catalyst device 41 can be easily and firmly fixed. Further, as shown in FIG. 9, the outlet 17A of the turbine housing 27 and the inlet 43A of the catalyst case 43 are connected to each other. On the other hand, an inlet 57 </ b> A of the exhaust delivery pipe 57 is connected to the outlet 43 </ b> B of the catalyst case 43. As shown in FIG. 8, the turbine unit 26 and the catalyst device 41 are arranged in the left-right direction and are adjacent to each other. Moreover, the compressor part 30, the turbine part 26, and the catalyst apparatus 41 are arrange | positioned in this order on the same straight line.

  Further, the exhaust path from the turbine unit 26 to the catalyst device 41 is formed in a straight line. That is, as shown in FIG. 9, the center of the outlet 27A of the turbine housing 27, the center of the inlet 43A of the catalyst case 43, the axis of the catalyst 42, and the center of the outlet 43B of the catalyst case 43 are identical. It is lined up on the line. As a result, the gas flows out from the outlet 27A of the turbine housing 27, flows into the catalyst 42 via the inlet 43A of the catalyst case 43, flows through the catalyst 42, and then is discharged from the outlet 43B of the catalyst case 43. The exhaust path to flow into the exhaust delivery pipe 57 is formed in a straight line.

  As shown in FIG. 4, the turbine unit 26 and the catalyst device 41 are covered with a cover 51. The cover 51 is formed in a cylindrical shape from a metal such as stainless steel. The cover 51 is disposed sideways so that its axis extends in the left-right direction. Since the supercharger 25 and the catalyst device 41 are arranged side by side in the left-right direction, the cover 51 that covers the turbine unit 26 and the catalyst device 41 can be made small and simple cylindrical.

  In this embodiment, the cover 51 is formed by a pair of cover plate members 52. One cover plate member 52 constitutes the upper half of the cover 51, and the other cover plate member 52 constitutes the lower half of the cover 51. Each cover plate member 52 is formed in a curved plate shape, and the cylindrical shape of the cover 51 is formed by fixing both cover plate members 52 together.

  The cover 51 covers the entire turbine section 26 and the entire catalyst device 41 over the entire circumference. As a result, the turbine unit 26 and the catalyst device 41 are arranged in one continuous space formed in the cover 51. Further, as shown in FIG. 9, in this embodiment, the axis of the cover 51 coincides with the axis of the catalyst 42.

  The cover 51 is fixed to a cover support portion 46 (see FIG. 8) formed on the outer peripheral portion of the catalyst case 43 using bolts or the like. With the structure in which the cover 51 is fixed to the cover support portion 46 formed in the catalyst case 43, the cover 51 can be easily and firmly fixed to the outer peripheral sides of the catalyst device 41 and the turbine portion 26.

  As can be seen from FIGS. 4 and 7, in this embodiment, both sides of the cover 51 in the axial direction are open. Further, as shown in FIG. 5, both end portions in the axial direction of the cover 51 are each reduced in diameter relative to the intermediate portion in the axial direction of the cover 51, and the degree of each reduced diameter advances to the tip in the axial direction of the cover 51. It is gradually getting bigger as you go. On the other hand, the cover 51 does not cover the compressor unit 30.

  Further, as shown in FIG. 6, a cutout 53 extending in the axial direction from the left edge is formed in the upper left portion of the cover 51. The exhaust manifold 23 is inserted through the cutout portion 53. Further, as shown in FIG. 7, an insertion hole 54 is formed in the lower left portion of the cover 51. The link member 34 is inserted through the insertion hole 54. In this way, the exhaust manifold 23 is inserted into the cutout portion 53 and the link member 34 is inserted into the insertion hole 54, so that the cover 51 is brought close to the outer peripheral surface of the turbine portion 26, and the cover 51 closes the outer peripheral side of the turbine portion 26. Can cover a wide range of. Further, since the insertion hole 54 is disposed under the cover 51, the water that has entered the cover 51 can be dropped outside through the insertion hole 54, and water is prevented from accumulating in the cover 51. be able to.

  Further, as shown in FIG. 2, the exhaust unit 21 is disposed in front of the cylinder 13 and below the radiator 9. A cover 51 that covers the turbine unit 26 and the catalyst device 41 is disposed below the radiator 9 and behind the front surface of the radiator 9. Thereby, the turbine part 26 and the catalyst device 41 can be arranged by effectively utilizing the empty space below the radiator 9 in front of the engine 11. Further, the length of the saddle riding type vehicle 1 can be shortened by bringing the turbine section 26 and the catalyst device 41 closer to the engine 11.

  As described above, in the saddle riding type vehicle 1 according to the embodiment of the present invention, the turbine unit 26 and the catalyst device 41 are arranged adjacent to each other in one continuous space formed in the cover 51. The amount of heat of the exhaust transmitted to both the turbine unit 26 and the catalyst device 41 can be increased. Thereby, both the improvement of the energy efficiency at the time of driving the turbine wheel 28 of the turbine part 26 using the energy of exhaust gas, and the quick activation of the catalyst 42 using the heat of exhaust gas can be aimed at. That is, both the turbine unit 26 and the catalyst device 41 can be disposed at positions close to the exhaust port of the engine 11, and the heat of the exhaust can be efficiently transmitted to both the turbine unit 26 and the catalyst 42. Further, since the turbine part 26 and the catalyst device 41 are adjacent to each other, the amount of heat transferred from the turbine part 26 to the catalyst 42 can be increased. Further, since the turbine unit 26 and the catalyst device 41 are covered by a single cover 51 that forms one continuous space, heat is transmitted from the turbine unit 26 to the catalyst 42 via the cover 51, and therefore The amount of heat transferred from the turbine unit 26 to the catalyst 42 can be increased.

  Further, the cover 51 can prevent the traveling wind from hitting the turbine section 26 or the catalyst device 41, and the turbine section 26 or the catalyst 42 can be prevented from being cooled by the traveling wind. As a result, it is possible to enhance both the energy efficiency when driving the turbine wheel 28 of the turbine unit 26 and the rapid activation of the catalyst 42.

  Further, since the high-temperature heat emitted from the turbine unit 26 and the catalyst device 41 can be blocked by the cover 51, other components can be protected from the heat emitted from the turbine unit 26 and the catalyst device 41. Further, the cover 51 can protect both the turbine section 26 and the catalyst device 41 from stepping stones or water.

  Furthermore, the cover 51 that covers the turbine unit 26 and the catalyst device 41 can be a single simple-shaped cover 51. Thereby, size reduction of the cover 51 can be achieved, and therefore the space in which the cover 51 is provided can be reduced. Therefore, the saddle riding type vehicle 1 can be reduced in size. Further, the cover 51 can be lightened, and the weight of the saddle riding type vehicle 1 can be reduced.

  Further, in the saddle riding type vehicle 1, the exhaust path from the turbine unit 26 to the catalyst device 41 is formed in a straight line. Thereby, the turbine part 26 and the catalyst apparatus 41 can be brought close to each other, and the exhaust path can be shortened. Therefore, the amount of heat transferred from the turbine section 26 to the catalyst 42 can be increased, and the activation of the catalyst 42 can be further accelerated. Further, the supercharger 25 and the catalyst device 41 can be arranged in a compact manner.

  Further, in the saddle riding type vehicle 1, since the compressor unit 30, the turbine unit 26, and the catalyst device 41 are arranged in this order on the same straight line, the turbine unit 26 and the catalyst device 41 can be brought close to each other. In addition, the exhaust path between the turbine unit 26 and the catalyst device 41 can be linear, and the exhaust path can be shortened.

  Further, in the saddle riding type vehicle 1, since the turbine part 26 and the catalyst device 41 are arranged in the left-right direction in front of the cylinder 13, both the turbine part 26 and the catalyst device 41 are brought close to the exhaust port of the engine 11. be able to. Thereby, the heat of exhaust can be efficiently transmitted to both the turbine section 26 and the catalyst 42.

  In the embodiment described above, the cover 51 is formed in a cylindrical shape, and the turbine 51 and the catalyst device 41 are surrounded by the cover 51 over the entire circumference. However, the cover is formed in a curved plate shape. The cover may cover only the upper side, the front side, and the lower side of the turbine unit 26 and the catalyst device 41, and may not cover the rear side.

  In the above-described embodiment, the insertion hole 54 through which the link member 34 is inserted is formed in the cover 51. However, the portion of the cover 51 through which the link member 34 is passed is not limited to the hole, and the link member 34 extends from the edge of the cover 51. It is good also as a cut part formed by excising a part of surrounding wall of the cover 51 to the part in which the base end part is located.

  In the above-described embodiment, the exhaust unit 21 is disposed in front of the cylinder 13, but the exhaust unit 21 may be disposed at another location. For example, it may be arranged in front of the crankcase 12.

  In the above-described embodiment, the two-cylinder engine 11 is taken as an example, but the engine may be a single cylinder or three or more cylinders. A V-type engine may also be used. The straddle-type vehicle is not limited to a motorcycle, and may be an automatic tricycle or a four-wheel buggy.

  Further, the present invention can be appropriately changed without departing from the spirit or idea of the invention which can be read from the claims and the entire specification, and a straddle-type vehicle accompanied with such a change is also applicable to the technology of the present invention. Included in thought.

DESCRIPTION OF SYMBOLS 1 Saddle-type vehicle 11 Engine 12 Crankcase 13 Cylinder 14 Cylinder head 15 Cylinder head cover 21 Exhaust unit 23 Exhaust manifold 25 Supercharger 26 Turbine part 27 Turbine housing 28 Turbine wheel (turbine)
30 Compressor part 33 Actuator 34 Link member 41 Catalytic device 42 Catalyst 43 Catalyst case 46 Cover support part 51 Cover 53 Cutting part 54 Insertion hole 57 Exhaust delivery pipe

Claims (7)

A turbine housing having a turbine housing in which the turbine is accommodated, and a turbine section that rotates the turbine by circulating exhaust gas exhausted from the engine into the turbine housing; and fuel combustion that operates by rotation of the turbine and is supplied to the engine A turbocharger comprising a compressor section for compressing air for use;
A catalyst device comprising a catalyst for purifying exhaust gas flowing out of the turbine housing;
A cover that covers the turbine unit and the catalyst device;
The straddle-type vehicle, wherein the turbine unit and the catalyst device are arranged adjacent to each other in one continuous space formed in the cover.   2. The supercharger and the catalyst device are arranged such that an exhaust path from an outlet of the turbine housing to an outlet of the catalyst device is linear. Saddle type vehicle.   The straddle-type vehicle according to claim 1 or 2, wherein the compressor unit, the turbine unit, and the catalyst device are arranged in this order on the same straight line.   The straddle-type vehicle according to any one of claims 1 to 3, wherein the supercharger and the catalyst device are arranged in front of the engine and are arranged in a lateral direction of the straddle-type vehicle. .   The straddle-type vehicle according to claim 4, wherein the cover is formed in a cylindrical shape, and an axis of the cover extends in a lateral direction of the straddle-type vehicle. A radiator for cooling the cooling water for cooling the engine;
The straddle-type vehicle according to any one of claims 1 to 5, wherein the cover is disposed below the radiator and behind the front surface of the radiator.   The cover is formed with a hole or a cut-out portion through which a link member that connects a waste gate valve that adjusts the amount of exhaust gas flowing from the engine into the turbine housing and an actuator that controls the waste gate valve is passed. The straddle-type vehicle according to any one of claims 1 to 6, wherein the straddle-type vehicle is provided.

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