JP2014034344A - Motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide structure for a motorcycle which has an exhaust pipe provided between a step and an under guard, the structure having no risk of breaking the exhaust pipe even when the under guard moves upward.SOLUTION: A right step bracket 50R is extended downward to form a stopper suppressing upward movement of a lower protection member 22 equivalent to the underguard. The step bracket 50R is mounted on a firm area of a motorcycle body frame such as a lower part of a pivot plate 18R. Such step bracket is used to prevent the lower protection member 22 from moving upward. Although an exhaust pipe 23 is arranged between the step bracket and the lower protection member, there is no risk that the exhaust pipe is broken.

Description

  The present invention relates to a motorcycle having an under guard under an engine.

  A structure for protecting the engine by covering the underside of the engine with an under guard has been proposed (see, for example, Patent Document 1 (FIG. 3)).

  As shown in FIG. 3 of Patent Document 1, an exhaust pipe (3) is provided laterally in the vehicle width direction of the engine (2) (the numbers in parentheses indicate the reference numerals described in Patent Document 1. The same applies hereinafter). An under tube (4a), also called a lower frame, is passed under the exhaust pipe (3). The engine (2) and the exhaust pipe (3) are protected by an under guard (5) that covers the engine (2) and the under tube (4a) from below.

A step (6) called a footrest is fixed to the upper end of the side plate (5b) of the under guard (5). The under guard (5) frequently hits the stepping stones and receives an impact, and the impact force is transmitted to the step (6), which affects the riding comfort.
Therefore, the step (6) is usually performed not on the under guard (5) but on the body frame.

Even if it is assumed that step (6) is attached to the vehicle body frame, in some motorcycles, step (6) is provided at a low position and the exhaust pipe (3) is passed under this step (6). is there. One of the purposes is to promote a low center of gravity.
However, since the step (6) is low, the exhaust pipe (3) is also lowered. As a result, the lower surface of the exhaust pipe (3) is lowered from the lower surface of the lower frame (under tube (4a)).

The under guard (5) protecting the exhaust pipe (3) is pushed up and may move upward. Then, there exists a possibility that an exhaust pipe (3) may be crushed by the under guard (5) and step (6) which move upwards. When the exhaust pipe (3) is crushed, the performance of the engine (2) is degraded.
Further, in a motorcycle, other parts and devices may be arranged at the exhaust pipe (3). In this case, as with the exhaust pipe, there is a concern about damage to other components and equipment.

  Therefore, in a motorcycle equipped with an underguard under the engine, a structure that does not cause damage to the exhaust pipe or the like even when a load is applied to the underguard is required.

Japanese Utility Model Publication No. 3-2885

  SUMMARY OF THE INVENTION An object of the present invention is to provide a structure in which there is no fear that an exhaust pipe or the like is damaged even if a load is applied to the underguard in a motorcycle having an underguard under an engine.

  According to a first aspect of the present invention, the vehicle body frame includes front and rear wheels, the vehicle body frame includes a step on which a driver puts a foot via a step bracket, and an engine is provided between the front and rear wheels. The engine and the step bracket A motorcycle including a lower protective member that covers the lower part from below is provided with a leg portion that extends downward to prevent the lower protective member from moving upward in the step bracket.

  The invention according to claim 2 is characterized in that an exhaust pipe for extracting exhaust gas from the engine is provided below the step and above the lower protective member.

  In the invention according to claim 3, the vehicle body frame includes a head pipe, a down frame extending downward from the head pipe, and a lower frame extending rearward from the down frame. The lower frame is located above the lower protective member. Further, the lower protective member is arranged with a gap therebetween.

  The invention according to claim 4 is characterized in that a gap is provided between the leg portion and the lower protective member.

  The invention according to claim 5 is characterized in that the step bracket is detachably attached to the vehicle body frame by a fastening member.

  The invention according to claim 6 is characterized in that the step bracket is provided with an exhaust pipe locking portion for fastening the exhaust pipe.

  The invention according to claim 7 is characterized in that the step bracket is provided with an arcuate storage recess for storing the exhaust pipe.

  The invention according to claim 8 is characterized in that the leg portion includes a bottom portion parallel to the upper surface of the lower protective member, a wall portion rising from the bottom portion, and a reinforcing rib connecting the wall portion and the bottom portion.

  In the invention according to claim 9, the step bracket has a pair of pin support pieces that support both ends of the pins penetrating the base of the step, and at least one of these pin support pieces is connected to the reinforcing rib. And

  In the invention which concerns on Claim 1, the step bracket is provided with the leg part which suppresses that a lower protection member moves upwards. The step bracket is attached to a strong part of the vehicle body frame such as a lower part of the pivot plate. Such a step bracket prevents the lower protective member from moving upward. When an exhaust pipe or the like is placed between the step bracket and the lower protective member, there is no concern that the exhaust pipe or the like is damaged.

  According to the second aspect of the present invention, the exhaust pipe placed between the step bracket and the lower protective member is protected, and there is no fear that the exhaust pipe is damaged.

  In the invention according to claim 3, the lower frame is disposed above the lower protective member with a gap from the lower protective member. When the lower protection member moves upward by an external force, this step prevention can be dedicated to the step bracket without leaving it to the lower frame. That is, the diameter and weight of the lower frame can be reduced.

  In the invention which concerns on Claim 4, since the clearance gap is provided between the leg part and the lower part protection member, there is no fear that the impact applied to a lower part protection member may be transmitted to a step, and riding comfort is maintained favorably. .

  In the invention according to claim 5, the step bracket is detachably attached to the vehicle body frame. The material of the body frame and the material of the step bracket can be selected separately. To reduce weight, the body frame can be made of an aluminum alloy, and the step bracket can be made of carbon steel, stainless steel, or titanium alloy to increase rigidity.

  In the invention which concerns on Claim 6, since the exhaust pipe latching | locking part which fastens an exhaust pipe is provided in the step bracket, an exhaust pipe is positioned with respect to a step bracket. There is no worry that the exhaust pipe contacts the step bracket or the lower protective member.

  In the invention according to claim 7, the step bracket is provided with an arcuate storage recess for storing the exhaust pipe. While extending the leg portion downward, the exhaust pipe can be arranged at a predetermined position below the step without interfering with the leg portion.

  In the invention which concerns on Claim 8, a leg part consists of a bottom part, a wall part, and the reinforcing rib which connects this wall part and a bottom part. By increasing the plane area of the bottom, it is possible to reduce the compressive stress when it hits the lower protective member. In addition, the reinforcing ribs can increase the overall rigidity, and the bottom portion and the wall portion can be thinned, so that the weight of the step bracket can be reduced.

  In the invention according to claim 9, the step bracket has a pair of pin support pieces, and at least one of the pin support pieces is connected to the reinforcing rib. The rigidity of the pin support piece can be increased, and the pin support piece can be thinned.

1 is a right side view of a motorcycle according to the present invention. 1 is a cross-sectional view of a motorcycle. It is a bottom view of a lower protection member. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is an attachment figure of the left step holder. It is an attachment figure of the right step holder. It is a top view of the right step holder. 1 is a perspective view of a main part of a motorcycle. It is a front view of a right step holder.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals. The left and right front and back are determined based on the driver.

  As shown in FIG. 1, the motorcycle 10 includes a front wheel 12 and a rear wheel 13 before and after a vehicle body frame 11, and an engine 14 is disposed between the front and rear wheels 12, 13. The vehicle travels by rotating the rear wheel 13.

  The vehicle body frame 11 includes a head pipe 16 and a main frame 17R extending from the head pipe 16 toward the rear of the vehicle (R is a subscript indicating the right. The right element can be seen in the right side view. The same applies hereinafter). A pivot plate 18R connected to the rear portion of 17R, a down frame 19 extending downward from the head pipe 16, and a lower frame extending from the down frame 19 below the engine 14 to the rear of the vehicle and connected to the pivot plate 18R (see FIG. 3) 21L, 21R) (L is a subscript indicating the left, and so on).

  The lower front portion and the bottom of the engine 14 are protected by the lower protection member 22. The exhaust gas of the engine 14 is led out through the exhaust pipe 23, is silenced by the silencer 24 at the rear end, and is discharged outside.

And step 25R where a driver puts a foot on the lower part of pivot plate 18R is arranged. The step 25R is attached to the pivot fret 18R via a step bracket 50R. The step bracket 50R may be provided at the rear part of the lower frame 21R. Since the pivot plate 18R is a member that supports the swing arm 28 via the pivot shaft 27, it has high rigidity. The rear part of the lower frame 21R connected to the pivot plate 18R rich in rigidity is also rich in rigidity.
A step bracket 50R is attached to the rear portion of the pivot plate 18R or the lower frame 21R which is rich in rigidity.

  As shown in FIG. 2, the top fuel tanks 29 are mounted on the left and right main frames 17L, 17R, and the left and right side fuel tanks 31L, 31R are located laterally in the vehicle width direction of the engine 14 and below the main frames 17L, 17R. Is installed.

The exhaust pipe 23 is passed to the right of the right lower frame 21R in the vehicle width direction, and the fuel pump 32 is arranged to the left of the left lower frame 21L in the vehicle width direction.
The engine 14, the left and right lower frames 21L and 21R, the exhaust pipe 23, and the fuel pump 32 are collectively covered and protected by the lower protective member 22.

  As shown in FIG. 3 (the left and right sides are reversed with respect to the bottom view), the lower protective member 22 has a substantially rectangular shape, and the rubber mount mechanism 34 is attached to the lower frames 21L and 21R at a plurality of locations (four locations in this example). It is connected via. The left step bracket 50 </ b> L is detached from the lower protection member 22, but the right step bracket 50 </ b> R overlaps the lower protection member 22.

  As shown in FIG. 4 (the cut surface of FIG. 3 but with the top and bottom reversed), the rubber mount mechanism 34 is provided, for example, with a metal circular pipe portion 35 and both ends of the circular pipe portion 35. It consists of the flange parts 36 and 36 and a rubber 37 fitted outside the circular pipe part 35 and between the flange parts 36 and 36. The recess 22 a of the lower protection member 22 is fitted into the central groove 38 of the rubber 37.

The bracket 39 is extended from the lower frame (FIG. 3, reference numerals 21L and 21R), the rubber mount mechanism 34 is applied to the bracket 39, and the rubber mount mechanism 34 is fastened to the bracket 39 with bolts 41.
Since the lower protective member 22 is fastened to the bracket 39 via the rubber 37, the lower protective member 22 can move. That is, the impact received by the lower protective member 22 is reduced by the rubber 37.

  Although the lower protective member 22 can move, a large gap a is secured between the lower frames 21L and 21R and the lower protective member 22 in FIG. Even if the lower protective member 22 moves upward due to the gap a, there is no fear of hitting the lower frames 21L and 21R.

  The structure of the rubber mount mechanism 34 can be changed. Further, the lower protective member 22 can be directly fixed to the vehicle body frame without disassembling the rubber mount mechanism 34.

Next, the structure of the step brackets 50L and 50R will be described in detail.
As shown in FIG. 5, the left step bracket 50 </ b> L has a standard form, and includes a bottom surface portion 51 extending in the vehicle front-rear direction and a pair of pin support pieces 52 and 53 cut and raised from the bottom surface portion 51. . A pin hole 54 is provided in the pin support piece 53, and a pin (FIG. 3, reference numeral 55) is inserted into the pin hole 54. In FIG. 3, step 25 is supported by a pin so as to be movable to the back of the drawing. In FIG. 5, the step bracket 50L is detachably fixed to the pivot plate 18L with bolts 56, 57 as fastening members.

On the other hand, as shown in FIG. 6, the right step bracket 50 </ b> R includes leg portions 61 that extend further downward from the bottom surface portion 51 and the pair of pin support pieces 52 and 53.
The leg portion 61 includes a bottom portion 62 that is parallel to the upper surface of the lower protective member 22, a wall portion 63 that rises from the bottom portion 62, and a reinforcing rib 64 that connects the wall portion 63 and the bottom portion 62. One pin support piece 53 is connected to the reinforcing rib 64. The wall portion 63 is integrally connected to the upper bottom surface portion 51.

  Furthermore, the vehicle front upper side of the wall portion 63 projects, and a bolt hole 66 for stopping the exhaust pipe is provided in the projecting portion 65. That is, an exhaust pipe locking portion 67 including an overhang portion 65 and a bolt hole 66 is provided on the step bracket 50R.

  Such a step bracket 50R is detachably attached to the pivot plate 18R with bolts 56 and 57. The material of the body frame (pivot plate 18R) and the material of the step bracket 50R can be selected separately. To reduce weight, the body frame can be made of an aluminum alloy, and the step bracket can be made of carbon steel, stainless steel, or titanium alloy to increase rigidity.

  A gap b is provided between the lower lower protection member 22 and the bottom 62. The gap b is set to such a size that the lower protective member 22 does not come into contact with the bottom 62 when the lower protective member 22 is shaken by hitting a stepping stone. With this setting, the vibration of the lower protective member 22 is not transmitted to the step bracket 50R, and the riding comfort is kept good.

  FIG. 7 is a plan view of the step bracket. The bottom portion 62 has a substantially rectangular shape extending from the wall portion 63 to the outside in the vehicle width direction and to the inside, and has a large area. The compressive stress that divides the force by the area decreases as the area increases. If the compressive stress is small, the cross-sectional area of the component can be reduced and the component can be thinned, and the step bracket 50R can be reduced in weight.

  As shown in FIG. 8, a right step bracket 50R is attached to the right pivot plate 18R, a step 25R is attached to the step bracket 50R so that it can be tilted up and down, and an exhaust pipe 23 indicated by an imaginary line is engaged with the step bracket 50R. It is locked via a stopper 68. By being locked, the exhaust pipe 23 is positioned with respect to the step bracket 50R. The locking tool 68 is attached to the bolt hole (reference numeral 66 in FIG. 6).

  As shown in FIG. 9, when viewed from the front of the vehicle, the step bracket 50R has an arcuate storage recess 69 so as to store the cylindrical exhaust pipe 23 indicated by an imaginary line. While extending the leg portion 61 downward, the exhaust pipe 23 can be disposed at a predetermined position below the step (pin hole 54) without interfering with the leg portion 61.

In the present invention, the leg portion 61 is provided on the right step bracket 50R, but the leg portion 61 may be provided on the left and right step brackets 50L and 50R.
The step brackets 50L and 50R are attached to the pivot plates 18L and 18R in the embodiment, but can be attached to the lower frames 21L and 21R.

  The present invention is suitable for a motorcycle including a lower protection member that protects the engine.

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 11 ... Body frame, 12 ... Front wheel, 13 ... Rear wheel, 14 ... Engine, 16 ... Head pipe, 19 ... Down frame, 21L, 21R ... Lower frame, 22 ... Lower protection member, 23 ... Exhaust pipe , 25L, 25R ... step, 34 ... rubber mount mechanism, 50L, 50R ... step bracket, 52, 53 ... pin support piece, 55 ... pin, 56, 57 ... fastening member (bolt), 61 ... leg, 62 ... bottom , 63 ... wall part, 64 ... reinforcing rib, 67 ... exhaust pipe locking part, 69 ... storage recess, a ... gap, b ... gap.

Claims (9)

The vehicle body frame (11) is provided with front and rear wheels (12, 13), and the vehicle body frame (11) is provided with a step (25R) on which a driver puts his / her foot through a step bracket (50R). 13) In the motorcycle including the engine (14) between the lower protection member (22) covering the engine (14) and the step bracket (50R) from below,
The motorcycle according to claim 1, wherein the step bracket (50R) is provided with a leg portion (61) that prevents the lower protective member (22) from moving upward, and extends downward.   The motorcycle according to claim 1, further comprising an exhaust pipe (23) for leading exhaust gas from the engine (14) below the step (25R) and above the lower protective member (22). . The vehicle body frame (11) includes a head pipe (16), a down frame (19) extending downward from the head pipe (16), and a lower frame (21R) extending rearward from the down frame (19). ,
The lower frame (21R) is arranged above the lower protective member (22) with a gap (a) between the lower protective member (22) and the lower protective member (22). The motorcycle according to 2.   The motorcycle according to any one of claims 1 to 3, wherein a gap (b) is provided between the leg portion (61) and the lower protective member (22).   The motorcycle according to any one of claims 1 to 4, wherein the step bracket (50R) is detachably attached to the vehicle body frame (11) by fastening members (56, 57).   The motorcycle according to any one of claims 1 to 5, wherein the step bracket (50R) is provided with an exhaust pipe locking portion (67) for fastening the exhaust pipe (23). .   The motorcycle according to any one of claims 1 to 6, wherein the step bracket (50R) is provided with an arcuate storage recess (69) for storing the exhaust pipe (23).   The leg portion (61) includes a bottom portion (62) parallel to the upper surface of the lower protective member (22), a wall portion (63) rising from the bottom portion (62), the wall portion (63) and the bottom portion ( The motorcycle according to any one of claims 1 to 7, further comprising a reinforcing rib (64) that connects to (62).   The step bracket (50R) has a pair of pin support pieces (52, 53) that support both ends of a pin (55) that penetrates the base of the step (25R), and these pin support pieces (52, 53). The motorcycle according to claim 8, wherein at least one of the two is connected to the reinforcing rib (64).

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