JPWO2017057340A1 - Saddle riding - Google Patents

Abstract

The saddle-ride type vehicle (11) has a crankcase (33), a cylinder block (36), and a cylinder head (37), and is mounted on the vehicle body frame (21) with the cylinder axis (CX) inclined forward. The engine (32) is provided. The exhaust pipe (39) extends from the cylinder head (37), crosses the cylinder block (36) toward the rear of the vehicle in a side view of the vehicle, passes through the upper part of the crankcase (33), and reaches the muffler (41) at the downstream end. ). The catalyzer (42) is installed on the exhaust pipe (39), and the catalyzer (42) is disposed on the side of the cylinder block (36). As a result, it is possible to provide a vehicle exhaust device that can improve the purification performance of the catalyzer and can avoid the reduction of the bank angle.

Description

  The present invention relates to a saddle-ride type vehicle having a catalyzer disposed in an exhaust pipe, and in particular, an engine mounted on a vehicle body frame in a posture in which a cylinder axis is tilted forward, and extends from the cylinder head toward the rear of the vehicle, The present invention relates to a saddle-ride type vehicle including an exhaust pipe connected to a muffler at a downstream end.

  Patent Document 1 discloses an exhaust pipe structure of an engine. Motorcycles have an engine with the cylinder shaft tilted forward. The exhaust pipe extends toward the rear of the vehicle from the exhaust port of the cylinder head through the space below the cylinder block and the crankcase. A catalyzer is built into the exhaust pipe.

Japanese Unexamined Patent Publication No. 2013-36422

  In Patent Document 1, the catalyzer can be disposed close to the exhaust port of the cylinder head. According to such a proximity arrangement, the heat of the exhaust gas is easily maintained up to the catalyzer, so that the temperature rise of the catalyzer is realized. As a result, the purification performance of the catalyzer can be enhanced. On the other hand, since the catalyzer swells below the crankcase, the bank angle of the motorcycle is reduced, or the heat generated from the catalyzer has a large influence on the periphery.

  The present invention has been made in view of such circumstances, and provides an exhaust device for a saddle-ride type vehicle that can improve the purification performance of the catalyzer and can avoid the reduction of the bank angle. With the goal.

  To achieve the above object, according to a first aspect of the present invention, there is provided a vehicle body frame, an engine having a crankcase, a cylinder block and a cylinder head and mounted on the vehicle body frame in a posture in which a cylinder axis is inclined forward. An exhaust pipe extending from the cylinder head, traversing the cylinder block in a side view of the vehicle, facing the rear of the vehicle, connected to a muffler at the downstream end through the upper part of the crankcase, and installed on the exhaust pipe Further, the present invention relates to a saddle-ride type vehicle including a catalyzer disposed on a side of the cylinder block.

  According to the second aspect, in addition to the first side surface, the saddle-ride type vehicle further includes a cowl member that is supported by the vehicle body frame and covers at least the cylinder block and the catalyzer from the side.

  According to the third aspect, in addition to the first or second side face, a pair of upper and lower fastening bosses fastened to the crankcase may be formed at the front portion of the muffler.

  According to the fourth aspect, in addition to the third side, the muffler may be formed in a box shape that partitions a plurality of gas chambers, and the exhaust pipe is disposed above the fastening boss at the front of the muffler. It only has to be connected.

  According to the fifth aspect, in addition to the fourth side surface, the muffler is provided at a first front and rear section extending toward the rear of the vehicle from an inlet for introducing exhaust gas from the exhaust pipe, and at a rear end of the first front and rear section. Provided with an inner pipe connected and having an upper and lower section extending downward from the first front and rear section and a second front and rear section connected to the lower end of the upper and lower section and extending from the upper and lower section toward the front of the vehicle Good.

  According to the sixth aspect, in addition to any one of the first side face to the fifth side face, the vehicle body frame is attached to a seat rail that supports an occupant seat, and supports the pillion step. What is necessary is just to further provide the stay which overlaps with the said catalyzer.

  According to the seventh aspect, in addition to any one of the first to sixth side surfaces, the cooling fan disposed on the outer side of the crankcase on the extension line of the crankshaft, and the cooling fan attached to the crankcase What is necessary is just to further provide the fan cover which covers a fan. At this time, in plan view, the outermost end of the exhaust pipe may be positioned inside the outermost end of the fan cover in the vehicle width direction.

  According to the first aspect, since the catalyzer is arranged on the side of the cylinder block, the temperature is likely to rise and the bank angle can be prevented from being reduced.

  According to the second aspect, the catalyzer is covered with the cowl member. Thus, exposure of the catalyzer is avoided. Good appearance is achieved in the vehicle. Here, since the catalyzer is covered with the cowl member above the space below the crankcase, the cowl member can be covered on the cylinder block as before. The catalyzer can be arranged in close proximity to the engine exhaust port without exposure, so that an increase in the temperature of the catalyzer can be realized and the purification performance of the catalyzer can be enhanced.

  According to the third aspect, the muffler is fixed to the engine. The muffler need not be directly connected to the body frame. Therefore, even if the engine is supported by the vehicle body frame so as to be swingable around the pivot, the muffler does not hinder the swing operation of the engine.

  According to the fourth aspect, the muffler can spread over a large range in the vertical direction, and as a result, the capacity of the gas chamber can be easily adjusted as required.

  According to the fifth aspect, since the length of the exhaust pipe including the inner pipe is ensured, the engine output characteristics derived from the exhaust characteristics can be adjusted.

  According to the sixth aspect, the stay can protect the catalyzer on the side of the vehicle.

  According to the seventh aspect, since the fan cover is disposed outside the exhaust pipe in the vehicle width direction, the fan cover collides with an external object before the exhaust pipe on the side of the vehicle. The tube can be protected.

FIG. 1 is a side view schematically showing an overall configuration of a motorcycle according to an embodiment of a saddle-ride type vehicle. (First embodiment) FIG. 2 is an enlarged partial side view schematically showing the engine, the exhaust pipe, and the muffler. (First embodiment) FIG. 3 is a cross-sectional plan view taken along line 3-3 in FIG. (First embodiment)

11 …… Saddle-ride type vehicle (motorcycle)
12 ... Body frame 19 ... Seat rail 22 ... Passenger seat 27 ... Cowl member 28 ... Pillion step 31 ... Stay 32 ... Engine 33 ... Crank case 34 ... Cooling fan 35 ... Fan cover 36 ... ... Cylinder block 37 ... Cylinder head 39 ... Exhaust pipe 39a ... Outermost end 41 ... Muffler 42 ... Catalyzer 43a ... First gas chamber 43b ... Second gas chamber 46 ... Fastening boss 51 ... Inner pipe 51a ... First front and rear section 51b ... Up and down section 51c ... Second front and rear section CX ... Cylinder axis

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First embodiment

  FIG. 1 schematically shows the overall configuration of a motorcycle according to an embodiment of a saddle-ride type vehicle. The motorcycle 11 includes a body frame 12. The vehicle body frame 12 includes a head pipe 13. A front fork 14 is supported on the head pipe 13 so as to be rotatable about an axis. The front fork 14 supports the front wheel 15 so as to be rotatable around a horizontal axis. A steering handle 16 is fixed to the upper end of the front fork 14.

  The vehicle body frame 12 includes a down tube 17, a side frame 18 and a seat rail 19. The front end of the down tube 17 is coupled to the head pipe 13. The down tube 17 extends rearward and downward from the head pipe 13.

  The front end of the side frame 18 is connected to the rear end of the down tube 17. The side frame 18 extends rearward from the rear end of the down tube 17. A low floor type floor 21 is supported on the side frame 18. A driver can place his / her feet on the floor 21 while traveling.

  The front end of the seat rail 19 is connected to the rear end of the side frame 18. The seat rail 19 extends rearward from the rear end of the side frame 18. An occupant seat 22 is supported on the seat rail 19. In addition to the driver, a tandem rider can sit behind the occupant seat 22.

  A swing type power unit 23 is connected to the body frame 12. The power unit 23 is supported by the bracket 25 of the vehicle body frame 12 so as to be swingable around a pivot 24 parallel to the axle of the front wheel 15 when traveling straight ahead. A rear wheel 26 is supported on the power unit 23 so as to be rotatable about a horizontal axis parallel to the pivot 24. The power unit 23 generates a driving force that generates rotation of the rear wheel 26.

  A cowl member 27 is supported on the body frame 12. The vehicle body frame 12 is covered with a cowl member 27. The cowl member 27 constitutes the appearance of the motorcycle 11. The cowl member 27 can be decorated by painting.

  The motorcycle 11 includes a pair of left and right pillion steps 28. The pillion step 28 is attached to the seat rail 19. When the pillion step 28 is attached, the stay 31 is fixed to the seat rail 19. The stay 31 extends rearward and downward from the seat rail 19. The pillion step 28 is supported at the tip of the stay 31. A tandem rider sitting on the occupant seat 22 behind the driver can place his feet on the pillion step 28.

  As shown in FIG. 2, the power unit 23 includes an engine 32. The engine 32 includes a crankcase 33. The crankcase 33 accommodates a crankshaft (not shown) that rotates about an axis parallel to the axis of the pivot 24. A cooling fan 34 is disposed outside the crankcase 33 on the extension line of the crankshaft. The cooling fan 34 is covered with a fan cover 35 attached to the crankcase 33.

  The engine 32 includes a cylinder block 36 and a cylinder head 37. The engine 32 is mounted on the vehicle body frame 12 with the cylinder axis CX tilted forward. The cylinder block 36 and the cylinder head 37 are accommodated in a shroud 38. The shroud 38 is attached to the crankcase 33. The outside air taken in by the cooling fan 34 passes through the inner space of the shroud 38 and cools the cylinder block 36 and the cylinder head 37. The cowl member 27 covers at least the cylinder block 36 in a vehicle side view. In the present embodiment, the cylinder block 36 and the cylinder head 37 are covered with the cowl member 27 as viewed from the side of the vehicle. The fan cover 35 on the crankcase 33 is at least partially exposed outside the edge of the cowl member 27.

  An exhaust pipe 39 is connected to the cylinder head 37. The exhaust pipe 39 extends from an upstream end connected to the downward surface of the cylinder head 37, crosses the cylinder block 36 from below in the vehicle side view, toward the rear of the vehicle, and downstream through the space above the crankcase 33. It is connected to the muffler 41 at the end. A catalyzer 42 is installed in the exhaust pipe 39. The catalyzer 42 is incorporated in the path of the exhaust pipe 39. The catalyzer 42 is disposed at a position overlapping the cylinder block 36 in a side view of the vehicle. The stay 31 of the pillion step 28 overlaps the catalyzer 42 in a side view of the vehicle. The catalyzer 42 is covered with a cowl member 27 that spreads from above.

  The muffler 41 is formed in a box shape that divides two gas chambers, that is, a first gas chamber 43a and a second gas chamber 43b in the front and rear. The internal space of the box-shaped muffler main body 41 a is partitioned by a partition wall 44. The partition wall 44 is embedded with a pipe 45 through which exhaust gas flows from the front first gas chamber 43a to the rear second gas chamber 43b.

  A pair of fastening bosses 46 are formed vertically on the front end of the muffler body 41a. The fastening bosses 46 are overlaid on the outer surface of the crankcase 33, respectively. The fastening boss 46 is fixed to the crankcase 33 with a bolt 47 screwed into the crankcase 33. An exhaust pipe 39 is connected to the muffler main body 41 a above the two fastening bosses 46.

  An inner pipe 51 is disposed in the muffler body 41a. The inner pipe 51 is connected to a first front and rear section 51a extending from the introduction port for introducing exhaust gas from the exhaust pipe 39 toward the rear of the vehicle, and a rear end of the first front and rear section 51a, and downward from the first front and rear section 51a. It has an upper and lower section 51b that extends and a second front and rear section 51c that is connected to the lower end of the upper and lower section 51b and extends from the upper and lower section 51b toward the front of the vehicle. The first front-rear section 51a reaches the second gas chamber 43b across the first gas chamber 43a. When entering the second gas chamber 43b, the first front-rear section 51a penetrates the partition wall 44 in an airtight manner. The upper and lower sections 51b are disposed in the second gas chamber 43b. The second front and rear section 51c enters the first gas chamber 43a from the second gas chamber 43b. When entering the first gas chamber 43a, the second front and rear section 51c penetrates the partition wall 44 in an airtight manner. The front end of the second front-rear section 51c opens at the first gas chamber 43a on the front side.

  An outlet pipe 52 is inserted into the muffler body 41a. The outlet pipe 52 connects the second gas chamber 43b to the outside air space.

  An intake pipe 53 is connected to the cylinder head 37. The intake pipe 53 extends from the upstream end connected to the upward surface of the cylinder head 37, and passes toward the rear of the vehicle through the space above the engine 32. A carburetor device 54 and an air cleaner device 55 are installed in the intake pipe 53.

  The fan cover 35 has a cylindrical side wall coaxial with the rotation axis of the cooling fan 34. As shown in FIG. 2, the exhaust pipe 39 is curved following the cylindrical shape of the fan cover 35. Thus, the exhaust pipe 39 is disposed close to the fan cover 35. In addition, as shown in FIG. 3, the outermost end 39 a of the exhaust pipe 39 is positioned on the inner side of the vertical plane VP that contacts the outermost end of the fan cover 35 in the vehicle width direction in plan view. Here, the vertical plane VP is orthogonal to the rotational axis of the crankshaft. As is apparent from FIG. 3, in plan view, the stay 31 of the pillion step 28 is disposed outside the exhaust pipe 39 and the catalyzer 42 in the vehicle width direction. Here, the stay 31 is disposed outside the vertical plane VP.

  In the exhaust device according to the present embodiment, the catalyzer 42 is disposed at a position overlapping the cylinder block 36 in a side view of the vehicle, and therefore is disposed close to the exhaust port of the engine 32 in the path of the exhaust pipe 39. Can do. As a result, the temperature rise of the catalyzer 42 is realized, and the purification performance of the catalyzer 42 can be improved. In addition, a reduction in the bank angle of the motorcycle can be avoided.

  In addition, the catalyzer 42 is covered with the cowl member 27 even though it is disposed close to the engine 32. Therefore, exposure of the catalyzer 42 is avoided. The motorcycle 11 can achieve a good appearance. Here, since the catalyzer 42 is covered with the cowl member 27 above the space below the crankcase 33, the cowl member 27 can be covered with the cylinder block 36 and the cylinder head 37 as before. On the other hand, if the catalyzer is disposed in the space below the crankcase 33, the cowl member 27 must spread to the lower side of the crankcase 33 when the cowl member 27 covers the catalyzer. The cover 35 is covered.

  As described above, the muffler 41 is fixed to the crankcase 33 by the pair of upper and lower fastening bosses 46. The muffler 41 need not be directly connected to the vehicle body frame 12. Therefore, even if the engine 32 swings around the pivot 24 while the motorcycle 11 is traveling, the muffler 41 does not hinder the swing operation of the engine 32. Good riding comfort is maintained according to the swing operation of the power unit 23.

  The muffler 41 is formed in a box shape that partitions the first gas chamber 43a and the second gas chamber 43b. In addition, an exhaust pipe 39 is connected to the muffler 41 above the fastening boss 46. The muffler 41 can spread in a large range in the vertical direction from the exhaust pipe 39 downward. Since a sufficiently large space is secured below the seat rail 19, the capacity of the gas chambers 43a and 43b can be easily adjusted as required.

  The exhaust pipe 39 and the inner pipe 51 in the muffler 41 can function as one exhaust pipe. The inner pipe 51 has a first front and rear section 51a, an upper and lower section 51b, and a second front and rear section 51c, and the length of the exhaust pipe 39 including the inner pipe 51 can be sufficiently secured. As a result, the output characteristics of the internal combustion engine derived from the exhaust characteristics can be adjusted.

  A pillion step 28 is disposed in the motorcycle 11. The pillion step 28 is supported by the stay 31. The stay 31 is disposed outside the catalyzer 42 in the vehicle width direction. In addition, since the stay 31 overlaps the catalyzer 42 in a vehicle side view, the stay 31 can protect the catalyzer 42 on the side of the vehicle.

  As described above, the outermost end of the exhaust pipe 39 is located inside the outermost end of the fan cover 35 in the vehicle width direction. Since the fan cover 35 protrudes outward in the vehicle width direction from the exhaust pipe 39, the fan cover 35 collides with an external object ahead of the exhaust pipe 39 on the side of the vehicle. Can be protected.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited to the said embodiment, A various design change is possible, without deviating from the summary.

Claims (7)

Body frame (12),
An engine (32) having a crankcase (33), a cylinder block (36) and a cylinder head (37) and mounted on the vehicle body frame (12) in a posture in which the cylinder axis (CX) is inclined forward;
It extends from the cylinder head (37), crosses the cylinder block (36) in the vehicle side view and goes to the rear of the vehicle, passes above the crankcase (33), and is connected to the muffler (41) at the downstream end. Exhaust pipe (39),
A catalyzer (42) installed on the exhaust pipe (39) and disposed on the side of the cylinder block (36);
A saddle-ride type vehicle characterized by comprising:   The saddle riding type vehicle (11) according to claim 1, further comprising a cowl member (27) supported by the body frame (12) and covering at least the cylinder block (36) and the catalyzer (42) from the side. A saddle-ride type vehicle characterized by further comprising:   The saddle riding type vehicle (11) according to claim 1 or 2, wherein a pair of upper and lower fastening bosses (46) fastened to the crankcase (33) are provided at a front portion of the muffler (41). A saddle-ride type vehicle characterized by   The saddle-ride type vehicle (11) according to claim 3, wherein the muffler (41) is formed in a box shape that defines a plurality of gas chambers (43a, 43b), and the muffler (41) has a The saddle-ride type vehicle, wherein the exhaust pipe (39) is connected above the fastening boss (46). The saddle-ride type vehicle (11) according to claim 4, wherein the muffler (41)
A first front and rear section (51a) extending toward the rear of the vehicle from an inlet for introducing exhaust from the exhaust pipe (39);
An upper and lower section (51b) connected to a rear end of the first front and rear section (51a) and extending downward from the first front and rear section (51a);
Saddle riding comprising an inner pipe (51) connected to the lower end of the upper and lower section (51b) and having a second front and rear section (51c) extending from the upper and lower section (51b) toward the front of the vehicle. Type vehicle.   The saddle riding type vehicle (11) according to any one of claims 1 to 5, wherein the pillion is attached to a seat rail (19) for supporting an occupant seat (22) in the body frame (12). A saddle-ride type vehicle, further comprising a stay (31) that supports step (28) and overlaps the catalyzer (42) in a side view of the vehicle. In the saddle-ride type vehicle (11) according to any one of claims 1 to 6,
A cooling fan (34) disposed outside the crankcase (33) on an extension line of the crankshaft;
A fan cover (35) attached to the crankcase (33) and covering the cooling fan (34);
A straddle-type vehicle characterized in that an outermost end (39a) of the exhaust pipe (39) is located inside an outermost end of the fan cover (35) in a vehicle width direction in a plan view.

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