JP2014069597A - Motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motorcycle capable of improving the layout of a front exhaust pipe and a rear exhaust pipe connected to a V-type engine, securing the curvature radius of the U-shaped bent part of the rear exhaust pipe, and easily maintaining the balance of an exhaust flow passage length between front and rear cylinders, and including a center stand.SOLUTION: A motorcycle 1 includes a V-type engine 3 having a front cylinder 18 and a rear cylinder 19, a front exhaust pipe 22 drooping down from the front face of the front cylinder 18 and extending to the rear side of a vehicle below the V-type engine 3, a drooping part 41 drooping down from the rear side face of the rear cylinder 19, a rear exhaust pipe 23 successive from the drooping part 41, extending to the front of the vehicle below the V-type engine 3, and bent and reversed to return to the rear side of the vehicle, a collecting pipe 42 for collecting the front exhaust pipe 22 and the rear exhaust pipe 23, and a center stand 43 having an oscillation center line C positioned to overlap a downward extension area A in which the drooping part 41 is virtually extended in its longitudinal direction when seen from a vehicle side face and configured to support the stopped vehicle in an upright state.

Description

  The present invention relates to a motorcycle.

  A motorcycle including a so-called V-type engine in which a cylinder row is inclined in a V shape is known. In particular, a motorcycle including a V-type engine in which cylinder rows are arranged in front and rear of a vehicle extends a front exhaust pipe from the front side of the front cylinder and a rear exhaust pipe from the rear side of the rear cylinder. The front exhaust pipe and the rear exhaust pipe are connected to a collecting pipe or a chamber below the V-type engine, such as a crankcase.

  By the way, the path through which the rear exhaust pipe reaches the chamber is drooping downward from the rear side of the V-type engine when viewed along the exhaust flow direction, and extends forward of the vehicle below the V-type engine. Bend into a letter shape, turn over and return to the rear of the vehicle. The rear exhaust pipe follows such a path, joins the front exhaust pipe, and is connected to the collecting pipe or the chamber. It is preferable that the U-shaped bent portion of the rear exhaust pipe can secure a larger curvature radius in order to reduce pressure loss with respect to the exhaust flow.

  A motorcycle including a center stand with such an exhaust system is known (see, for example, Patent Document 1).

JP 2010-235055 A

  From the viewpoint of avoiding the suppression of the bank angle of the vehicle, it is not preferable to arrange the center stand and the exhaust system widely with respect to the V-type engine or the vehicle body frame, and it is desirable that they are approximately the same. Therefore, the width dimension that can be allocated to the exhaust system is suppressed at the location where the center stand and the swing axis are disposed.

  By the way, the motorcycle described in Patent Document 1 extends forward by providing a rear exhaust pipe on the outside of the H-shaped center stand, not on the inside. For the convenience of such a layout, in the motorcycle described in Patent Document 1, the width between the left and right legs of the center stand is narrower than the V-type engine or the body frame. If it does so, it will become difficult to arrange | position the chamber larger diameter than a front side exhaust pipe and a rear side exhaust pipe between the legs of a center stand. Further, in order to avoid interference between the chamber and the rear wheel, it is necessary to arrange the chamber on the vehicle front side with respect to the center stand. On the other hand, the rear exhaust pipe must be bent in a U shape at the front side of the vehicle further than the chamber, and must be joined to the front exhaust pipe and connected to the chamber. Thus, there is a difference in the length from the front and rear cylinders to the chamber. That is, the rear exhaust pipe is longer than the front exhaust pipe.

  Therefore, the present invention improves the layout of the front exhaust pipe and the rear exhaust pipe respectively connected to the V-type engine, ensures the curvature radius of the U-shaped bent portion of the rear exhaust pipe, and between the front and rear cylinders. We propose a motorcycle that is easy to maintain the balance of the exhaust flow path length and that has a center stand.

  In order to solve the above-described problems, a motorcycle according to the present invention includes a V-type engine having a front cylinder and a rear cylinder, a vehicle that hangs downward from a front side surface of the front cylinder and is lower than the V-type engine. A front exhaust pipe that extends rearward of the rear cylinder, a hanging portion that hangs downward from the rear side surface of the rear cylinder, and that extends to the front of the vehicle below the V-type engine and bends and reverses below the V-type engine. A vehicle with respect to a rear exhaust pipe that returns to the rear of the vehicle, a collecting pipe that joins the front exhaust pipe and the rear exhaust pipe, and a downward extension region in which the hanging portion is virtually extended in the longitudinal direction thereof A center stand having a swing center line at a position overlapping in a side view and supporting a vehicle to be stopped in an upright state.

  According to the present invention, the layout of the front exhaust pipe and the rear exhaust pipe connected to the V-type engine is improved, the radius of curvature of the U-shaped bent portion of the rear exhaust pipe is secured, and the front and rear cylinders are secured. It is possible to provide a motorcycle that easily maintains the balance of the exhaust flow path length and that includes a center stand.

1 is a right side view showing a motorcycle according to an embodiment of the present invention. 1 is a left side view showing a motorcycle according to an embodiment of the present invention. The front view which shows the principal part of the motorcycle which concerns on embodiment of this invention. The left view which shows the principal part of the motorcycle which concerns on embodiment of this invention. The right view which shows the principal part of the motorcycle which concerns on embodiment of this invention. The rear view which shows the principal part of the motorcycle which concerns on embodiment of this invention. The bottom view which shows the principal part of the motorcycle which concerns on embodiment of this invention. The left view which shows the principal part of the motorcycle which concerns on embodiment of this invention. The right view which shows the principal part of the motorcycle which concerns on embodiment of this invention. The bottom view which shows the principal part of the motorcycle which concerns on embodiment of this invention.

  Embodiments of a motorcycle according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a right side view showing a motorcycle according to an embodiment of the present invention.

  FIG. 2 is a left side view showing the motorcycle according to the embodiment of the present invention.

  As shown in FIGS. 1 and 2, the motorcycle 1 according to the present embodiment is disposed in front of the vehicle body frame 2, a vehicle body frame 2 that extends in the front-rear direction of the vehicle, a V-type engine 3 that is fixed to the vehicle body frame 2. The steering mechanism 5 is supported so as to be steerable in the left-right direction of the vehicle, the front wheel 6 is disposed in front of the body frame 2 and is rotatably supported by the steering mechanism 5, and is disposed behind the body frame 2. A rear wheel suspension device 7 that is swingably supported in the vertical direction of the vehicle and a rear wheel 9 that is disposed behind the vehicle body frame 2 and is rotatably supported by the rear wheel suspension device 7 are provided.

  In the following description, the up / down / front / rear and left / right directions are defined as the left side of the motorcycle 1 when viewed from the passenger of the motorcycle 1 and the right hand side of the motorcycle 1 when viewed from the passenger. The head side of the passenger of the motorcycle 1 is defined as the upper side of the motorcycle 1 and the opposite side is defined as the lower side of the motorcycle 1. The direction of each part constituting the motorcycle 1 is the same as that of the motorcycle 1.

  The body frame 2 is, for example, a twin tube type. The vehicle body frame 2 includes a head pipe 11 disposed at the front of the vehicle body frame 2, a pair of left and right main frames 12 extending in the vehicle width direction immediately after the head pipe 11 and extending obliquely rearward and downward, A pair of left and right center frames 13 integrally connected to the rear end portion and extending substantially downward and a pair of left and right seat frames 15 extending obliquely rearward and upward from the rear end of the main frame 12 are provided.

  The main frame 12 extends in the width direction of the vehicle to an appropriate width suitable for an occupant to straddle.

  The head pipe 11 supports the steering mechanism 5 so as to be steerable.

  The center frame 13 includes a pivot portion 16. The pivot portion 16 supports the rear wheel suspension device 7 in a swingable manner.

  The V-type engine 3 is disposed between the front wheel 6 and the rear wheel 9 when viewed in the front-rear direction of the vehicle, and is provided on the vehicle body frame 2. The V-type engine 3 includes a cylinder row inclined in a V shape. The V-type engine 3 includes a front cylinder 18 disposed on the front side of the vehicle and a rear cylinder 19 disposed on the rear side. The intake side of the V-type engine 3 is connected to a throttle body (not shown). On the other hand, the exhaust side of the V-type engine 3 is connected to the exhaust pipe 21.

  The exhaust pipe 21 hangs down from the front cylinder 18 and extends below the V-type engine 3 to the rear of the vehicle, and the exhaust pipe 21 hangs down from the rear cylinder 19 and below the V-type engine 3 to the front of the vehicle. And a rear exhaust pipe 23 that reverses and merges with the front exhaust pipe 22, and an exhaust muffler 25 that guides the exhaust gas that has joined from the front exhaust pipe 22 and the rear exhaust pipe 23 to the rear of the right side surface of the vehicle.

  The power of the V-type engine 3 is transmitted to the rear wheel 9 sequentially through a drive sprocket (not shown), a chain (not shown), and a driven sprocket (not shown).

  The steering mechanism 5 is steered left and right around the head pipe 11. The steering mechanism 5 includes a steering head 26 rotatably supported by the head pipe 11, a pair of left and right front forks 27 provided on the steering head 26, and a front fork 27 that partially covers an upper portion of the front wheel 6. A front fender 28 and a handle 29 provided on the top of the steering head 26 are provided.

  The front fork 27 includes a suspension mechanism (not shown) to ground the front wheel 6.

  The rear wheel suspension device 7 swings around the pivot portion 16. The rear wheel suspension device 7 includes a swing arm 31 that extends from the pivot portion 16 toward the rear of the vehicle, a rear wheel 9 that is rotatably supported by the rear end portion of the swing arm 31, and a space between the swing arm 31 and the vehicle body frame 2. And a rear cushion unit 32 installed on the vehicle.

  The swing arm 31 includes a front end portion that is swingably supported by the pivot portion 16.

  The rear cushion unit 32 is disposed substantially at the center in the front-rear direction of the vehicle and cushions the vehicle body frame 2 and the swing arm 31. The rear cushion unit 32 is connected to the swing arm 31 via a link mechanism 34.

  The motorcycle 1 further includes a fuel tank 33 disposed above the V-type engine 3 and supported by the vehicle body frame 2, a passenger seat 35 disposed behind the fuel tank 33, a lower portion of the seat 35, and A frame cover 36 that covers the rear and a rear fender 37 that partially covers the upper portion of the rear wheel 9 are provided.

  Furthermore, the motorcycle 1 includes a streamlined cowling 38 that covers the front of the vehicle body. The cowling 38 reduces air resistance during traveling of the motorcycle 1 and protects the rider from traveling wind pressure.

  Next, the V-type engine 3 and the exhaust pipe 21 will be described in detail.

  FIG. 3 is a front view showing a main part of the motorcycle according to the embodiment of the present invention.

  FIG. 4 is a left side view showing the main part of the motorcycle according to the embodiment of the present invention.

  FIG. 5 is a right side view showing a main part of the motorcycle according to the embodiment of the present invention.

  FIG. 6 is a rear view showing a main part of the motorcycle according to the embodiment of the present invention.

  FIG. 7 is a bottom view showing a main part of the motorcycle according to the embodiment of the present invention.

  FIG. 8 is a left side view showing a main part of the motorcycle according to the embodiment of the present invention.

  FIG. 9 is a right side view showing the main part of the motorcycle according to the embodiment of the present invention.

  FIG. 10 is a bottom view showing a main part of the motorcycle according to the embodiment of the present invention.

  FIG. 8 is a diagram showing the vehicle body frame 2 from FIG. FIG. 9 is a diagram showing the vehicle body frame 2 from FIG. FIG. 10 is a view showing the vehicle body frame 2 from FIG.

  As shown in FIG. 3 to FIG. 10, the motorcycle 1 according to this embodiment includes a V-type engine 3 having a front cylinder 18 and a rear cylinder 19, and a V-type engine that hangs downward from the front side surface of the front cylinder 18. The vehicle is located below the V-type engine 3 so as to be connected to the front exhaust pipe 22 which extends downward from the rear side of the rear engine 19 and the hanging portion 41 which hangs downward from the rear side surface of the rear cylinder 19. The rear exhaust pipe 23 that extends forward, bends, reverses, and returns to the rear of the vehicle, the collecting pipe 42 that merges the front exhaust pipe 22 and the rear exhaust pipe 23, and the drooping portion 41 are virtually arranged in the longitudinal direction. And a center stand 43 that has a swing center line C at a position that overlaps with the downwardly extended region A that is extended in a side view in a vehicle side view, and supports the vehicle that is stopped in an upright state.

  Further, the exhaust pipe 21 of the motorcycle 1 purifies the exhaust of the V-type engine 3 by being accommodated in the chamber 45 that is disposed so as to overlap at least a part of the lower extension region A in a side view of the vehicle. And a catalyst 46.

  The V-type engine 3 is a 4-stroke V-type 2-cylinder engine. Note that the present invention is not limited to this, and an engine of V-type four cylinders or more may be used.

  The V-type engine 3 includes a crankcase 51 that houses a crankshaft (not shown) that extends in the width direction (left-right direction) of the vehicle, a front cylinder 18 that extends obliquely upward from the front upper portion of the crankcase 51, and a front cylinder. 18, a rear cylinder 19 that extends obliquely rearward and upward from an immediately rear portion of the 18, an oil pan 52 provided at a lower portion of the crankcase 51, and an oil filter 53 provided at a front lower portion of the crankcase 51.

  The crankcase 51 accommodates a crankshaft in the front half and a clutch (not shown) and a transmission (not shown) in the rear half.

  The front cylinder 18 and the rear cylinder 19 open in a V shape in a side view of the vehicle, respectively, a cylinder body 55 provided in the crankcase 51, a cylinder head 56 that closes the upper end of the cylinder body 55, and an upper end of the cylinder head 56 And a head cover 57 for closing.

  The front exhaust pipe 22, the rear exhaust pipe 23, the collecting pipe 42, and the chamber 45 are part of the exhaust pipe 21. The exhaust pipe 21 includes an exhaust muffler 25 in addition to the front exhaust pipe 22, the rear exhaust pipe 23, the collecting pipe 42 and the chamber 45.

  The front exhaust pipe 22 is connected to the exhaust port of the front cylinder 18 and extends downward in front of the vehicle, hangs down while being bent, and is an area L below the V-type engine 3 (hereinafter referred to as “lower area L”). )), The lower region L extends substantially linearly toward the rear of the vehicle and reaches the collecting pipe 42. The straight portion of the front exhaust pipe 22 approaches the vicinity of the left side edge of the V-type engine 3 or the vehicle body frame 2 in the lower region L.

  The rear exhaust pipe 23 is connected to the exhaust port of the rear cylinder 19 for the convenience of the rear wheel 9, the swing arm 31, and the region where the suspension 58 exists, and extends rearward of the vehicle and away from the V-type engine 3. In a position that reaches the side of the suspension 58, it hangs substantially straight on the right side of the suspension 58, reaches the lower region L of the V-type engine 3, and extends substantially linearly toward the front of the vehicle in the lower region L. However, it is arranged on the right side of the chamber 45, bent in a U shape in the region extending from the vicinity of the front end of the chamber 45 to the right side of the collecting pipe 42, and reaches the collecting pipe 42 through a U-shaped bent portion 59 that is reversed.

  The drooping portion 41 is a portion that droops substantially straight in the rear exhaust pipe 23. The downward extension region A is a region obtained by virtually extending a portion of the rear exhaust pipe 23 that hangs substantially straight. Since the drooping portion 41 according to the present embodiment hangs substantially straight, the downward extension region A also refers to a region that extends substantially straight downward. In addition, the drooping part 41 may be inclined and inclined (for example, inclined diagonally forward and downward). In this case, the downward extension region A is a region in which the inclined hanging portion 41 is virtually extended.

  The collecting pipe 42 is connected to the front exhaust pipe 22 and the rear exhaust pipe 23, and combines the exhaust of the front cylinder 18 guided by the front exhaust pipe 22 and the exhaust of the rear cylinder 19 guided by the rear exhaust pipe 23. Into the chamber 45.

  The chamber 45 has a cylindrical shape that is larger in diameter and shorter than the front exhaust pipe 22 and the rear exhaust pipe 23, and is connected to the collecting pipe 42. The chamber 45 is behind the straight portion of the front exhaust pipe 22 and approaches the vicinity of the left side edge of the V-type engine 3 or the vehicle body frame 2 in the lower region L. The sum of the tube diameters of the straight exhaust pipe 23 lined up on the right side of the chamber 45 and the chamber is the width dimension of the V-type engine 3 or the vehicle body frame 2 from the viewpoint of securing the bank angle of the motorcycle 1. It is preferable that it is smaller than the side of the vehicle body.

  The exhaust muffler 25 is connected to the rear end portion of the chamber 45, extends from the vicinity of the left side of the vehicle to the right side of the vehicle while bypassing the hanging portion 41 of the rear exhaust pipe 23, and extends obliquely rearward and upward.

  The center stand 43 is supported by the vehicle body frame 2 via a pair of left and right brackets 61 provided at the lower ends of the center frames 13. The center stand 43 swings around a swing center line C extending in the width direction of the vehicle by a bearing portion 62 provided on the pair of left and right brackets 61. The swing center line C is disposed on the lower side and the rear side with respect to the pivot portion 16, and on the other hand, on the lower side and on the front side with respect to the link mechanism that connects the suspension 58 and the swing arm 31. The center stand 43 swings between a retracted storage position (FIGS. 4, 5, and 7 to 10) and a retracted deployment position (FIGS. 3 and 6).

  The center stand 43 is substantially H-shaped, and includes a pair of left and right legs 65 and 66 that are separated in the width direction of the vehicle, and a cross member 67 that is provided between the pair of left and right legs 65 and 66 and connects the legs. Prepare. The pair of left and right legs 65 and 66 spread from the support end on the swing center line C side toward the free ends (that is, the ground contact ends) of the legs 65 and 66.

  The exhaust pipe 21 extends between the pair of left and right legs 65 and 66 of the center stand 43. Specifically, the rear exhaust pipe 23 and the exhaust muffler 25 pass between a pair of left and right legs 65 and 66. The chamber 45 is disposed in front of the swing center line C while overlapping the downward extension region A in a side view of the vehicle. The collecting pipe 42 and the front exhaust pipe 22 are present in front of the chamber 45, that is, in front of the swing center line C, and the U-shaped bent portion 59 of the rear exhaust pipe 23 is also the same.

  On the other hand, the center stand 43 occupies the dimension in the width direction of the vehicle like the U-shaped bent part 59 by disposing the swing center line C in the downward extension region A of the rear exhaust pipe 23 in a side view of the vehicle. By avoiding the portion, the width of the pair of left and right legs 65 and 66, particularly the support end portions of both legs, can be increased to the width of the body frame 2.

  In the motorcycle 1 according to the present embodiment, the swing center line C of the center stand 43 is disposed in the downward extension region A of the rear exhaust pipe 23, so that a vehicle such as the chamber 45 or the U-shaped bent portion 59 is provided. The bank angle of the motorcycle 1 can be secured by avoiding the portion that occupies the dimension in the width direction and suppressing the width of the support end portion of the center stand 43 to about the width of the vehicle body frame 2. On the other hand, the motorcycle 1 eliminates the competition of the occupied area with the center stand 43 with respect to the chamber 45 and the U-shaped bent portion 59 to increase the size of the chamber 45 or the radius of curvature of the U-shaped bent portion 59. It is easy to ensure a large value, and it is easy to bring out the performance of the V-type engine 3 by reducing the exhaust resistance.

  In addition, the motorcycle 1 according to the present embodiment suppresses the length of the rear exhaust pipe 23 to a minimum, thereby allowing the length of the front exhaust pipe 22 and the length of the rear exhaust pipe 23 to be found in a conventional motorcycle. Therefore, it is easy to set the optimum and shortest exhaust pipe length for both the front cylinder 18 and the rear cylinder 19, which is preferable from the viewpoint of exhaust interference between the front cylinder 18 and the rear cylinder 19. .

  By the way, by avoiding the rear exhaust pipe 23 and simply moving the swing center line C of the center stand 43 closer to the rear wheel 9, the width direction dimensions of the chamber 45 and the U-shaped bent portion 59 can be ensured. On the other hand, avoiding the rear exhaust pipe 23 and simply bringing the swing center line C of the center stand 43 close to the rear wheel 9 is an interference between the center stand 43 and the rear wheel 9, more specifically, the cross member 67 and the rear wheel. A new need arises to avoid interference with 9. In order to avoid interference between the cross member 67 and the rear wheel 9, the center stand 43 must bring the cross member 67 close to the swing center line C. As a result, the cantilevered portion of the free end portion (that is, the ground contact end portion) of the center stand 43 becomes long, and the strength and rigidity must be ensured by increasing the thickness of the legs 65 and 66 and increasing the tube diameter. I will have to. However, in the motorcycle 1 according to the present embodiment, the swing center line C of the center stand 43 is disposed in the downward extension region A of the rear exhaust pipe 23, whereby the width direction of the chamber 45 and the U-shaped bent portion 59 is increased. While ensuring the dimensions, it is easy to ensure the separation distance between the center stand 43, particularly the cross member 67 and the rear wheel 9, and the cross member 67 can be brought close to the swing center line C of the center stand 43. 43 is preferable also from the viewpoint of securing the strength and rigidity.

  Furthermore, in the motorcycle 1 according to the present embodiment, the chamber 45 is overlapped with at least a part of the lower extension region A and arranged at the rear of the vehicle as much as possible. The rear exhaust pipe 23 is kept to a minimum length by being arranged closer to the rear side.

  Furthermore, the motorcycle 1 according to the present embodiment includes the catalyst 46 in the chamber 45 while minimizing the lengths of the front exhaust pipe 22 and the rear exhaust pipe 23, so that the front cylinder 18 and the rear cylinder 18 are arranged. It is possible to shorten the exhaust flow path length to the catalyst for both the side cylinders 19, suppress the temperature drop of the exhaust, and further increase the reduction ability of the catalyst 46.

  Therefore, according to the motorcycle 1 of the present invention, the layout of the front exhaust pipe 22 and the rear exhaust pipe 23 connected to the V-type engine 3 is improved while the center stand 43 is provided, and the rear exhaust pipe 23 is improved. The radius of curvature of the U-shaped bent portion is ensured, and the balance of the exhaust flow path length between the front cylinder 18 and the rear cylinder 19 is easily maintained.

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 3 V-type engine 5 Steering mechanism 6 Front wheel 7 Rear wheel suspension 9 Rear wheel 11 Head pipe 12 Main frame 13 Center frame 15 Seat frame 16 Pivot part 18 Front cylinder 19 Rear cylinder 21 Exhaust pipe 22 Front side Exhaust pipe 23 Rear exhaust pipe 25 Exhaust muffler 26 Steering head 27 Front fork 28 Front fender 29 Handle 31 Swing arm 32 Rear cushion unit 33 Fuel tank 34 Link mechanism 35 Seat 36 Frame cover 37 Rear fender 38 Cowling 41 Hanging part 42 Collecting pipe 43 Center stand 45 Chamber 46 Catalyst 51 Crankcase 52 Oil pan 53 Oil filter 55 Cylinder body 56 Cylinder head 57 Head cover 58 Suspension 9 U-shaped bent portion 61 the bracket 62 bearing 65, 66 leg 67 cross member

Claims (3)

A V-type engine having a front cylinder and a rear cylinder;
A front exhaust pipe that hangs downward from the front side surface of the front cylinder and extends to the rear of the vehicle below the V-type engine;
A hanging portion that hangs downward from the rear side surface of the rear cylinder, a rear exhaust pipe that is connected to the hanging portion, extends forward of the vehicle below the V-type engine, bends and reverses, and returns to the rear of the vehicle. When,
A collecting pipe for joining the front exhaust pipe and the rear exhaust pipe;
A center stand having a swing center line at a position overlapping with a downward extension region in which the hanging portion is virtually extended in the longitudinal direction in a side view of the vehicle, and supporting the vehicle to be stopped in an upright state. Motorcycle characterized by that. The motorcycle according to claim 1, further comprising a chamber that is disposed so as to overlap at least a part of the downward extension region in a side view of the vehicle. The motorcycle according to claim 2, further comprising a catalyst housed in the chamber for purifying exhaust of the V-type engine.

Images