JP4704249B2 - Motorcycle step mounting structure - Google Patents

Description

  The present invention relates to a step mounting structure for a motorcycle.

  In Patent Document 1 below, a rear frame is provided at the rear end of a main frame having a head pipe at the front end, and a driver seat and a passenger seat are provided on the rear frame, and a passenger seat is provided via a step stay. A motorcycle equipped with steps is disclosed.

The rear frame is formed by extrusion or drawing, and the step stay is detachably attached to an attachment portion formed integrally with the rear frame.
JP-A-62-103285

  The passenger step of the motorcycle needs to be arranged in a predetermined positional relationship with the passenger seat so that the passenger's feet can be easily placed. Therefore, the shape of the step stay is determined so that the step can be positioned at a predetermined position.

  However, the mounting position of the step stay with respect to the rear frame and the positional relationship between the rear frame and the passenger's seat differ depending on the motorcycle model. Therefore, in order to position the step to a predetermined position, a step stay is manufactured for each model. There is a need to. Therefore, it is difficult to share a step stay among a plurality of models. Depending on the type of motorcycle, other parts such as an exhaust pipe may be disposed around the step stay. In this case, the step stay needs to be formed in a special shape so as to avoid the part. . This is also one of the factors that hinder the sharing of step stays.

  Also, in Patent Document 1, in order to integrally form the step stay mounting portion with the rear frame, the rear frame is integrally formed with a rib, and the rib is partially cut to form the step stay mounting portion. is doing. Therefore, the molding of the rear frame including the mounting portion becomes complicated, the weight of the entire rear frame increases, and the mounting portion of the step stay is formed by cutting, so that the number of work steps increases.

  On the other hand, passenger seats for motorcycles are unnecessary for single-seater users, so passenger seats may be removed and replaced with covers, and passenger steps may be removed along with the step stays. is there.

  However, in Patent Document 1, the mounting portion for the step stay formed on the rear frame protrudes greatly downward from the rear frame. Therefore, when the step stay is removed, the mounting portion is exposed to the outside, and the appearance is damaged. become.

  An object of the present invention is to provide a step mounting structure for a motorcycle that allows a step stay to be shared among a plurality of models, and that facilitates manufacture and weight reduction of the rear frame itself.

According to a first aspect of the present invention, in a structure in which a step is attached to a rear frame of a motorcycle via a step stay, an intermediate bracket having an attached portion attached to the rear frame and an attachment portion to which the step stay is attached is provided. The attached portion is detachably attached to the rear frame , the step stay is attached to the attachment portion, and the step stay is disposed below the rear frame, and the side of the rear frame A frame cover is provided on the side, and a portion to which the attached portion of the rear frame is attached is formed to be covered from the side by the frame cover, the step stay is exposed from the frame cover, and the intermediate The bracket has a shape in which the mounting portion partially protrudes downward. Cage, the mounting portion is characterized by exposed downward from the frame cover.

  According to this, for example, when a step stay used in another model is to be shared, the intermediate bracket may be formed so that the steps are arranged in a predetermined positional relationship with respect to the seat. Further, even when parts such as an exhaust pipe are arranged around the step stay, an intermediate bracket may be formed so as to avoid the parts. Therefore, the step stay can be shared among a plurality of models.

Also, unlike the prior art, it is not necessary to form the step stay mounting portion on the rear frame, so the structure of the rear frame can be simplified, and the rear frame can be easily manufactured and reduced in weight. it can.
When a step is not necessary, the intermediate bracket is removed from the rear frame, so that the attachment portion of the intermediate bracket on the rear frame is covered with the frame cover, and the appearance is not impaired.

According to a second aspect of the present invention, in the first aspect of the invention, the intermediate bracket has a bent portion between the mounted portion and the mounting portion.

According to this, when an excessive external force is applied to the step, it is possible to prevent the external force from being absorbed by the external force absorbing portion of the intermediate bracket and transmitted to the rear frame.

According to a third aspect of the present invention, in a structure in which a step is attached to a rear frame of a motorcycle via a step stay, an intermediate bracket having an attached portion attached to the rear frame and an attachment portion to which the step stay is attached is provided. The attached portion is detachably attached to the rear frame, the step stay is attached to the attachment portion, and the step stay is disposed below the rear frame, and the side of the rear frame A frame cover is provided on the side, and a portion to which the attached portion of the rear frame is attached is formed to be covered from the side by the frame cover, the step stay is exposed from the frame cover, and the intermediate The bracket is covered from the side by the frame cover It is characterized in.

According to this, for example, when a step stay used in another model is to be shared, the intermediate bracket may be formed so that the steps are arranged in a predetermined positional relationship with respect to the seat. Further, even when parts such as an exhaust pipe are arranged around the step stay, an intermediate bracket may be formed so as to avoid the parts. Therefore, the step stay can be shared among a plurality of models.
Also, unlike the prior art, it is not necessary to form the step stay mounting portion on the rear frame, so the structure of the rear frame can be simplified, and the rear frame can be easily manufactured and reduced in weight. it can.
Further, the intermediate bracket is not covered with the frame cover, and the appearance is not impaired.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the bent portion includes a first bent portion and a second bent portion, and the intermediate bracket is formed from the lower side of the attached portion. It is inclined laterally outward and downward via the part, and is substantially vertical from above the attachment part via the second bent part.

  According to the present invention, the step stay can be shared among a plurality of models, and the rear frame itself can be easily manufactured and reduced in weight.

[First Embodiment]
FIG. 1 is a left side view of a rear portion of a motorcycle according to an embodiment of the present invention. The motorcycle 10 is provided with a pair of left and right swing arm brackets 11 projecting downward at the rear end of a main frame (not shown) having a head pipe fixed to the front end, and the rear part of the main frame or the upper part of the swing arm bracket 11. In addition, a vehicle body frame configured by providing a rear frame 12 extending rearward and upward is provided. A swing arm 14 that rotatably supports the rear wheel 13 is supported on the swing arm bracket 11 via a pivot shaft 15 in the left-right direction so as to be swingable up and down. A driver's seat 16 is provided above the rear frame 12, and a passenger's seat 17 is provided adjacent to the rear side of the driver's seat 16.

  Below the rear frame 12, a passenger's step 21L is arranged. The step 21L is foldably provided at the lower end of the step stay 22L, and the step stay 22L is attached to the left side surface of the rear frame 12 via an intermediate bracket 23L.

  FIG. 2 is a rear right side surface of the motorcycle, and a step stay 22R is attached to the right side surface of the rear frame 12 via an intermediate bracket 23R, and a step 21R is provided at the lower end of the step stay 22R so as to be foldable. It has been. The step stays 22L, 22R and the intermediate brackets 23L, 23R are formed by, for example, aluminum die casting.

  FIG. 3 is a left side view of the rear frame 12. The rear frame 12 is molded by, for example, aluminum die casting, and two attachment holes 24 used for attachment to the main frame or the swing arm bracket 11 (FIG. 1) are formed on the front end side. Two front and rear mounting holes 25 are formed on the left and right side surfaces on the front side of the rear frame 12. The portion where the mounting hole 25 is formed is an intermediate bracket mounting portion 26 for mounting the intermediate bracket 23L. An internal thread is formed in the mounting hole 25.

  The intermediate bracket 23L is formed in a substantially parallelogram in a side view, and includes a rear frame attached portion 28 for attaching to the rear frame 12, and a step stay attaching portion 29 for attaching the step stay 22L at the lower portion. In preparation, the opening 23A is formed in the center.

  FIG. 4 is a longitudinal sectional view showing a structure for attaching the left step to the rear frame 12. As shown in FIGS. 3 and 4, the rear frame attached portion 28 and the step stay attaching portion 29 are respectively formed with attachment holes 30 and 31 penetrating in the left-right direction at two front and rear portions. An internal thread is formed in the mounting hole 31 of the step stay mounting portion 29. As shown in FIG. 3, the intermediate bracket 23 </ b> L has a shape in which the portions where the mounting holes 30 and 31 are formed partially protrude upward and downward.

  The two attachment holes 30 of the rear frame attached portion 28 are adapted to the attachment holes 25 of the intermediate bracket attachment portion 26 formed in the rear frame 12, and as shown in FIG. 4, the attachment holes of the intermediate bracket 23L. The intermediate bracket 23 </ b> L is detachably attached to the rear frame 12 by inserting a bolt 32 through 30 in the left-right direction and screwing the bolt 32 into the attachment hole 25 of the rear frame 12.

  In addition, the bolt 35 is inserted in the left and right direction above the step stay 22L, and the bolt 35 is screwed into the mounting hole 31 of the step stay mounting portion 29 so that the step stay 22L can be attached to and detached from the intermediate bracket 23L. It can be attached.

  The intermediate bracket 23L is inclined obliquely to the left and downward from the slightly lower side of the rear frame attached portion 28 via the bent portion 33, and returns to a substantially vertical posture from the slightly upper side of the attached portion 29 via the bent portion 34. Yes. As shown in FIG. 3, the bent portions 33 and 34 are formed so as to extend before and after the intermediate bracket 23L except for the opening 23A portion.

  As shown in FIG. 1, the left side of the rear frame 12 is covered with a left frame cover 36. The rear frame attached portion 28 of the intermediate bracket 23L is covered by the left frame cover 36, and the step stay attaching portion 29 protrudes downward from the left frame cover 36.

  FIG. 5 is a left side view of the rear part of the motorcycle showing a state in which the step stay 22L is removed from the intermediate bracket 23L. In this state, the intermediate bracket 23L protrudes downward from the left frame cover 36 and is exposed to the outside. However, if the intermediate bracket 23L is removed, the intermediate bracket mounting portion 26 of the rear frame 12 is covered by the left frame cover 36 and is not exposed to the side.

  As shown in FIG. 2, an exhaust pipe 38 of an engine (not shown) arranged at the front lower part of the vehicle body extends rearward through the lower side of the vehicle body, rises upward on the front side of the rear wheel 13, and The rear frame 12 extends obliquely upward and substantially along the right side of the rear frame 12. A portion extending obliquely upward and rearward of the exhaust pipe 38 is covered with a right frame cover 40. The intermediate bracket 23R is also covered with the right frame cover 40.

  FIG. 6 is a longitudinal sectional view showing a structure for attaching the right step 21R to the rear frame 12. As shown in FIG. The exhaust pipe 38 is disposed on the right side of the intermediate bracket 23R. As with the left intermediate bracket 23L, the right intermediate bracket 23R has a rear frame attachment portion 28 detachably attached to the intermediate bracket attachment portion 26 of the rear frame 12 by bolts 32, and a step stay attachment portion. 29, the upper portion of the step stay 22R is attached by a bolt 35. The step stay 22R extends from the lower part of the intermediate bracket 23R to the right through the lower side of the exhaust pipe 38, and further extends while curving toward the lower right.

(Operational effect of this embodiment)
(1) As shown in FIGS. 1 and 2, the step stays 22L and 22R of the passenger steps 21L and 21R are attached to the rear frame 12 via the intermediate brackets 23L and 23R. When the step stays 22L and 22R used in the model are to be diverted, the steps 22L and 22R can be arranged at appropriate positions with respect to the passenger seat 17 only by changing the shape of the intermediate brackets 23L and 23R. it can. In other words, by attaching the step stays 22L and 22R via the intermediate brackets 23L and 23R, it becomes possible to share the step stays 22L and 22R between different models.

  (2) When the motorcycle is used with the passenger steps 21L and 21R removed from the rear frame 12, the intermediate brackets 23L and 23R and the step stays 22L and 22R are removed from the rear frame 12 for the intermediate bracket of the rear frame 12. The mounting portion 26 is covered with the left and right frame covers 36 and 40 so as not to be exposed to the outside. Therefore, even if the steps 21L and 21R are removed, the appearance can be kept intact.

  As shown in FIG. 2, the right frame cover 40 is formed larger than the left frame cover 36 so as to cover the exhaust pipe 38, so that the step stay 22R is simply removed from the intermediate bracket 23R. The intermediate bracket mounting portion 26 and the intermediate bracket 23R of the rear frame 12 can be covered.

  (3) Since the step stays 22L and 22R are attached to the rear frame 12 via the intermediate brackets 23L and 23R, it is necessary to integrally form the attachment portion for the step stay with the rear frame 12 as shown in the prior art. In addition, the structure of the rear frame can be simplified. For example, when the rear frame 12 is formed in a cross-sectional shape as shown in FIG. 7, it is difficult to mold by die casting or the like if the step stay mounting portion 100 as shown by a dotted line is integrally formed. However, since it is not necessary to form such an attachment part 100, it can be easily molded by the upper mold and the lower mold.

  (4) As shown in FIG. 4, the intermediate bracket 23L has the bent portions 33 and 34 between the rear frame attached portion 28 and the step stay attaching portion 29. When a load (external force) such as arrows F1 and F2 is applied to the intermediate bracket 23L, the intermediate bracket 23L is easily deformed by the bent portions 33 and 34, compared to the step stay 22L and the rear frame 12. For this reason, when the motorcycle 10 falls sideways, the impact (external force) transmitted from the step 21L can be absorbed by the intermediate bracket 23L and can be made difficult to transmit to the rear frame 12. Here, the bent portions 33 and 34 constitute an external force absorbing portion that absorbs an external force applied to the step stay. Further, by forming the opening 23A (FIG. 3) in the central portion of the intermediate bracket 23L, it is possible to enhance the external force absorbing function as well as the weight reduction.

[Second Embodiment]
FIG. 8 is a longitudinal sectional view of a step mounting structure according to the second embodiment of the present invention. In the present embodiment, an intermediate bracket mounting portion 26 ′ having a mounting hole 25 ′ is formed on the lower surface of the rear frame 12. A substantially vertical vertical piece 45B extending downward from the portion is formed in a substantially L shape in sectional view, and a rear frame attached portion 28 having a mounting hole 30 is provided in the horizontal piece 45A of the intermediate bracket 23R. A step stay mounting portion 29 having a mounting hole 31 is provided. Then, the rear frame attached portion 28 of the intermediate bracket 23R is overlapped with the intermediate bracket attaching portion 26 ′ of the rear frame 12 and attached with the bolt 32, and the step stay 22R is attached to the step stay attaching portion 29 with the bolt 35. It is attached.

  This embodiment has substantially the same operational effects as the first embodiment, but when the intermediate bracket 23R is removed, the intermediate bracket mounting portion 26 'is not exposed to the outside even if the right frame cover 40 is not provided. It has the advantage.

[Third Embodiment]
FIG. 9 is a longitudinal sectional view of a step mounting structure according to the third embodiment of the present invention. In the present embodiment, the upper end portion of the step stay 22L is superimposed on the inner side in the left-right direction of the step stay mounting portion 29 of the intermediate bracket 23L and fixed by the bolt 35. Also in this embodiment, there exists an effect similar to 1st Embodiment.

[Fourth Embodiment]
FIG. 10 is a longitudinal sectional view of a step mounting structure according to the fourth embodiment of the present invention. In the present embodiment, intermediate bracket mounting portions 26 and 26 ′ having mounting holes 25 and 25 ′ are formed on the side surface and the bottom surface of the rear frame 12, and the intermediate bracket 23 L is connected to a substantially vertical upper vertical piece 46 A and an upper vertical length. A substantially horizontal horizontal piece 46B protruding inward in the left-right direction from the lower end of the piece 46A, and a lower vertical piece 46C extending downward from the boundary portion between the upper vertical piece 46A and the horizontal piece 46B, has a substantially T shape in cross section. The rear frame attached portions 28 and 28 'having the attachment holes 30 and 30' are provided in the upper vertical piece 46A and the horizontal piece 46B, respectively, and the step stay attaching portion 29 is provided in the lower vertical piece 46C. . Then, the rear frame attached portion 28 of the upper vertical piece 46A is attached to the intermediate bracket attaching portion 26 on the side surface of the rear frame 12 by the bolt 32, and the rear of the horizontal piece 46B is attached to the intermediate bracket attaching portion 26 ′ on the lower surface of the rear frame 12. The frame attachment portion 28 is attached by a bolt 32 ′, and the step stay 22L is attached by a bolt 35 to the step stay attachment portion 29 of the lower vertical piece 46C.

  This embodiment has the same effects as those of the first embodiment, and the intermediate bracket 23L can be more firmly fixed to the rear frame 12.

[Fifth Embodiment]
FIG. 11 is a longitudinal sectional view of a step mounting structure according to the fifth embodiment of the present invention. In the present embodiment, the intermediate bracket 23L is formed in a substantially L shape in sectional view by a substantially vertical vertical piece 47A and a substantially horizontal horizontal piece 47B protruding outward in the left-right direction from the lower end of the vertical piece 47A. The vertical frame 47A is provided with a rear frame attached portion 28, and the horizontal piece 47B is provided with a step stay attaching portion 29. The rear frame attached portion 28 is attached to the rear frame 12 in the same manner as the first embodiment, and the step stay attaching portion 29 has the upper end portion of the step stay 22L superimposed on the lower surface and the upper and lower portions. It is fixed by a directional bolt 35. This embodiment also has the same effect as the first embodiment.

  The present invention is not limited to the above embodiments, and can be appropriately changed in design. For example, the present invention can be configured as follows.

  (1) The intermediate brackets 23L and 23R are not limited to aluminum die casting, and can be formed by ordinary casting, pressing, or the like. Also, the material is not particularly limited.

  (2) For example, in FIGS. 4 and 6, the insertion direction of the bolts 32 and 35 may be reversed in the left-right direction, and the bolt 32 may be screwed to the intermediate bracket 23L and the bolt 35 may be screwed to the step stay 22L. In FIG. 8, the bolt 32 may be inserted into the intermediate bracket 23R with the insertion direction of the bolt 32 turned upside down.

  (3) The intermediate bracket 23L does not form the bent portions 33 and 34 as shown in FIG. 4, and easily absorbs external force depending on the shape (partially thinned) of the intermediate bracket 23L, the material, the heat treatment method, and the like. You may form in a structure.

  (4) In the second to fifth embodiments, the attachment structure for one of the left and right steps is shown, but it can also be applied as the attachment structure for the other step.

  (5) In each of the above embodiments, the step bracket mounting portion 29 and the step stays 22L, 22R of the intermediate brackets 23L, 23R are detachably mounted by the bolts 35, but the step stay mounting portion 29 and the step stay 22L are attached. , 22R may be fixed by welding, riveting or the like.

  (6) The bolts 32 and 35 of the present embodiment are shown with the tightening portion omitted, but any detachable bolt such as a normal hexagon bolt or hexagon allen bolt can be used.

  The present invention can be applied to various motorcycles such as motorcycles for general use or racing.

1 is a left side view of a rear part of a motorcycle according to an embodiment of the present invention. It is the right side of the rear part of the motorcycle. It is a left view of a rear frame. It is a longitudinal cross-sectional view which shows the structure which attaches the left side step to a rear frame. Fig. 6 is a left side view of the rear part of the motorcycle showing a state in which the step stay is removed from the intermediate bracket. It is a longitudinal cross-sectional view which shows the structure which attaches the step on the right side to a rear frame. It is a longitudinal cross-sectional view which shows an example of a rear frame. It is a longitudinal cross-sectional view of the step attachment structure based on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the step attachment structure which concerns on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the step attachment structure which concerns on 4th Embodiment of this invention. It is a longitudinal cross-sectional view of the step attachment structure which concerns on 5th Embodiment of this invention.

DESCRIPTION OF SYMBOLS 10 Motorcycle 12 Rear frame 21L, 21R Step 22L, 22R Step stay 23L, 23R Intermediate bracket 26 Intermediate bracket attachment part 28 Rear frame attachment part 29 Step stay attachment part 33, 34 Bending part

Claims (4)

In the structure where a step is attached to the rear frame of a motorcycle via a step stay,
An intermediate bracket having an attached portion attached to the rear frame and an attaching portion for attaching the step stay;
The attached portion is detachably attached to the rear frame , the step stay is attached to the attachment portion, and the step stay is disposed below the rear frame,
A frame cover is provided on a side of the rear frame, and a portion for attaching the attached portion of the rear frame is formed to be covered from the side by the frame cover,
The step stay is exposed from the frame cover,
The intermediate bracket has a shape in which the mounting portion partially projects downward,
The step mounting structure for a motorcycle, wherein the mounting portion is exposed downward from the frame cover . The motorcycle step mounting structure according to claim 1, wherein the intermediate bracket has a bent portion between the mounted portion and the mounting portion. In the structure where a step is attached to the rear frame of a motorcycle via a step stay,
An intermediate bracket having an attached portion attached to the rear frame and an attaching portion for attaching the step stay;
The attached portion is detachably attached to the rear frame , the step stay is attached to the attachment portion, and the step stay is disposed below the rear frame,
A frame cover is provided on a side of the rear frame, and a portion for attaching the attached portion of the rear frame is formed to be covered from the side by the frame cover,
The step stay is exposed from the frame cover,
The step mounting structure for a motorcycle, wherein the intermediate bracket is covered from the side by the frame cover . The bent portion has a first bent portion and a second bent portion,
The intermediate bracket is inclined laterally outward and downward from the lower portion of the attached portion via the first bent portion, and is substantially vertical from the upper portion of the attaching portion via the second bent portion. The step mounting structure for a motorcycle according to claim 2.

Images