JP2007245773A - Frame structure of motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a frame structure of a motorcycle capable of improving the rigidity of the frame by using a cylindrical member, and eliminating reinforcement of the frame to counter the load on a stay. <P>SOLUTION: In the frame structure of the motorcycle, engine hangers 25, 26 are mounted to the side surface of an outer frame 71 having a U-shape cross section opened at the lower part. A collar 98 is disposed on the inner surface of the outer frame 71 with abutting on both end parts. Bolt insertion holes 81a, 82a are opened on the left and right side walls 81, 82 of the outer frame respectively, and the engine hangers 25, 26 are fastened to the outer frame 71 with bolts 83 passing through the bolt insertion holes 81a, 82a and the collar 98. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in the frame structure of a motorcycle.

2. Description of the Related Art As a conventional motorcycle frame structure, there is known a frame structure in which an attachment stay for attaching components is attached to a side surface of the frame (see, for example, Patent Document 1).
JP 2000-95171 A

  As shown in FIGS. 5 and 7 of Patent Document 1, the frame 30 includes an upper member 31 having a U-shaped cross-section with an open lower portion and a lower member 32 having a U-shaped cross-section with an open upper portion, and a flange 31c on the upper member 31 side. , 31c and the lower member 32 side flanges 32c, 32c are welded together, and a mounting member 38 is attached to one side wall portion 32b of the lower member 32.

Since the attachment stay 38 is simply welded to the side wall 32b of the lower member 32, for example, when supporting a heavy part with the attachment stay 38, the periphery of the side wall 32b of the lower member 32 must be reinforced. In other words, it increases the weight of the vehicle.
An object of the present invention is to attach a stay to a press-molded frame without requiring special reinforcement.

According to a first aspect of the present invention, in a motorcycle frame structure in which a stay is attached to a side surface of a U-shaped cross-section with an open lower portion, a cylindrical member is disposed with both ends being in contact with the inner surface of the frame and the left and right sides of the frame Bolt insertion holes are respectively formed in the side walls of the frame, and the stay is fastened to the frame with bolts that penetrate the bolt insertion holes and the tubular member.
As an effect, since the left and right side walls of the frame are connected by the cylindrical member and the bolt, the rigidity of each side wall of the frame is increased.

The invention according to claim 2 is characterized in that stays are attached to the left and right side walls.
As an effect, the left and right stays are attached with common bolts, so that the assembly workability is improved and the number of parts is reduced.

The invention according to claim 3 is characterized in that the cylindrical member is fixed to the inside of the frame by welding.
As an effect, when the bolt is passed through the inside of the tubular member, it is not necessary to support the tubular member by hand, so that assembly workability is improved.

The invention according to claim 4 is characterized in that a plate material is attached to the lower portion of the frame so as to close the open portion.
As an action, a plate material is attached to the lower part of the frame to make the frame a closed cross-sectional structure and to increase the rigidity of the frame.

The invention according to claim 5 is characterized in that the left and right stays are expanded downward in a C shape.
As an operation, the left and right stays can be expanded in a C shape downward, and a part having a width larger than the width of the frame can be attached to the lower part of the stay.

  According to the first aspect of the present invention, the cylindrical member is arranged with both ends being applied to the inner surface of the frame, and bolt insertion holes are formed in the left and right side walls of the frame, respectively, and the stay is a bolt that penetrates the bolt insertion hole and the cylindrical member. Since the frame is fastened to the frame, the cylindrical member can improve the rigidity of the frame, and the frame does not need to be reinforced against the load applied to the stay.

  In the invention according to claim 2, since the stays are attached to the left and right side walls, the left and right stays are attached with a common bolt, so that the assembly workability can be improved and the number of parts can be reduced.

  In the invention according to claim 3, since the cylindrical member is fixed to the inside of the frame by welding, the bolt can be assembled in a state where the cylindrical member is fixed to the frame, and workability can be improved. Productivity can be improved.

  In the invention according to claim 4, since the plate material is attached to the lower part of the frame and the open part is closed, the rigidity of the frame can be improved, the deformation of the frame can be suppressed, and the stay is further strengthened. Can be supported.

  In the invention according to the fifth aspect, since the left and right stays are expanded in the shape of a letter C, a wide part can be attached to the stay without increasing the width of the frame.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a motorcycle adopting a frame structure according to the present invention. The motorcycle 10 is steered by a body frame 11 formed of press-molded parts and a head pipe 12 provided at the front portion of the body frame 11. A front fork 13 that is freely attached, a bar handle 14 and a front wheel 16 that are respectively attached to the top and bottom of the front fork 13, an engine 17 that is attached to a substantially central portion of the vehicle body frame 11, and a rear portion of the engine 17. The transmission 18, the swing arm 21 swingably attached to the lower part of the center of the body frame 11, the rear wheel 22 attached to the rear end of the swing arm 21, the rear end of the swing arm 21, and the body frame 11 A pair of left and right rear cushion units 23, 23 attached to the rear (only the reference numeral 23 on the front side is shown) ) And it is a vehicle that includes a.

  The engine 17 is provided on a pair of left and right engine hangers 25 and 26 (only the front side reference numeral 25 is shown) attached to a substantially central portion of the vehicle body frame 11 and a lower portion (a pivot support portion 74 described later) of the vehicle body frame 11. It is supported by the lower support portions 27 and 28.

  In the figure, 31 is a headlamp, 32 is a handle cover, 33 is a front cover, 34 is a front fender, 36 is a leg shield, 37 is a carburetor, 38 is an air cleaner, 39 is a center cover, 41 is an exhaust pipe, 42 is a step, Reference numeral 43 is a side stand, 44 is a main stand, 46 is a chain, 47 is a body cover, 48 is a seat, 51 is a grab rail, 52 is a tail lamp, 53 is a rear fender, and 54 is a pivot shaft that supports the swing arm 21 in a swingable manner.

  FIG. 2 is a perspective view showing a frame structure according to the present invention (the arrow (FRONT in the figure represents the front of the vehicle; the same applies hereinafter)), and the vehicle body frame 11 extends from the head pipe 12 to the rear of the vehicle. Main frame 61, a pair of left and right seat rails 62, 63 extending from the rear portion of the main frame 61 to the rear of the vehicle body, and extending from the rear portion of the main frame 61 to the rear of the vehicle body, with the rear ends attached to the seat rails 62, 63, respectively. The frame member includes a pair of left and right subframes 65 and 66 (only the reference numeral 65 is shown on the front side) and a pair of left and right engine hangers 25 and 26 attached to both side surfaces of a substantially central portion of the main frame 61.

  The main frame 61 is a member having a closed structure with a double structure in which an inner frame 72 having a U-shaped cross-section with a lower opening is attached to the inside of an outer frame 71 having a U-shaped cross-section with a lower opening. . Reference numeral 74 denotes a pivot support portion provided integrally with the rear portion of the main frame 61, and reference numeral 54 denotes the above-described pivot shaft attached to the pivot support portion 74 so as to penetrate the respective side walls of the outer frame 71 and the inner frame 72.

  The inner frame 72 is press-molded in a U-shaped cross section, and the upper wall portion 72 a is configured by flat portions 72 b and 72 c and a corrugated portion 72 d and is inserted inside the outer frame 71. The flat portions 72b and 72c are joined by laser beam welding or brazing, and the corrugated portion 72d is spot welded and attached to the inner frame 71.

  FIG. 3 is a perspective view showing the main part of the frame structure according to the present invention. The engine hangers 25 and 26 (only the reference numeral 25 on the front side) are substantially at the center of the main frame 61 and seat rails 62 and 63. This is a member attached with two bolts 83, 83 to the side walls 81, 82 (only the reference numeral 81 on the near side is shown) in front of the base of the base. Reference numerals 85 to 87 denote engine mounting holes formed in the engine hangers 25 and 26 and the lower support portions 27 and 28 for mounting the engine 17 (see FIG. 1).

FIG. 4 is a plan view of the main part showing the frame structure according to the present invention. The engine hangers 25 and 26 are attached to the left and right side walls 81 and 82 of the outer frame 71 with bolts 83 and 83 and nuts 91 and 91, respectively. Show.
The left and right sub-frames 65 and 66 are members attached to the pivot support portion 74 and the pivot shaft 54 with their front ends attached with a cross pipe 77 therebetween.

  FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 4, and the outer frame 71 is a member formed by press-molding a plate material. The outer frame 71 is integrally extended downward from the upper wall 95 and the left and right edges of the upper wall 95. Side walls 81 and 82.

  The side walls 81 and 82 are respectively provided with bolt insertion holes 81a and 81a (one symbol 81a is not shown) and bolt insertion holes 82a and 82a (one symbol 82a is not shown), and these bolt insertion holes 81a and 82a. The collar 98 is attached to the inner surfaces 81b and 82b of the side walls 81 and 82 by welding so that the hollow portions 97 coincide with each other. 81c and 82c are side surfaces of the side walls 81 and 82, respectively.

  The inner plate 72 is a member formed by press-molding a plate material, and includes an upper wall 101 and side walls 102 and 103 integrally extending downward from left and right edges of the upper wall 101.

The lower ends of these side walls 102 and 103 and the lower end of the outer frame 71 are attached by welding.
The engine hanger 25 is a member formed by press-molding a plate material, and includes an upper plate portion 105 applied to the side wall 81, an inclined plate portion 106 that extends obliquely downward from the lower side of the upper plate portion 105, This is a member integrally formed with a lower plate portion 107 extending downward from the lower end of the inclined plate portion 106.

The upper plate portion 105 is a portion in which a bolt insertion hole 105 a for inserting the bolt 83 is opened.
The upper plate portion 105 and the inclined plate portion 106 are members obtained by press-molding ribs 108 for reinforcement.
The engine hanger 26 has the same basic structure as the engine hanger 25 and will not be described.

  As shown in FIGS. 1 and 5, the present invention is a frame of the motorcycle 10 in which the engine hangers 25 and 26 as stays are attached to the side surface of the outer frame 71 as a U-shaped frame having an open lower portion. In the structure, a collar 98 as a cylindrical member is disposed inside the outer frame 71, and bolt insertion holes 81a and 82a are formed in the left and right side walls 81 and 82 of the outer frame 71, respectively, and the engine hangers 25 and 26 are inserted through the bolts. It is characterized by being fastened to the outer frame 71 with a bolt 83 penetrating the holes 81a and 82a and the collar 98.

  Thereby, the rigidity of the outer frame 71 can be improved by the fastening force of the collar 98 and the bolt 83 penetrating the collar 98, and the reinforcement of the outer frame 71 with respect to the load applied to the engine hangers 25 and 26 becomes unnecessary.

Further, the present invention is characterized in that the engine hangers 25 and 26 are attached to the left and right side walls 81 and 82.
Thereby, the rigidity of the left and right side walls 81 and 82 of the outer frame 71 can be increased, and the engine hangers 25 and 26 can be firmly supported by the common bolt 83.

Furthermore, the present invention is characterized in that the collar 98 is fixed to the inside of the outer frame 71 by welding.
As a result, the bolts 83 can be assembled and tightened with the collar 98 fixed to the outer frame 71, workability can be improved, and productivity can be improved.

Furthermore, the present invention is characterized in that an inner frame 72 as a plate material is attached to the lower portion of the outer frame 71 so as to close the open portion.
Thereby, the rigidity of the outer frame 71 and hence the rigidity of the main frame 61 can be improved, and the engine hangers 25 and 26 can be supported more firmly.

Furthermore, the present invention is characterized in that the left and right engine hangers 25 and 26 are expanded downward in a C shape.
As a result, the wide part, that is, the engine 17 can be attached to the engine hangers 25 and 26 without increasing the width of the outer frame 71.

FIG. 6 is a cross-sectional view showing a frame structure (another embodiment) according to the present invention. The same components as those in the embodiment shown in FIG.
The main frame 110 includes an outer frame 71 and an inner frame 111 having a U-shaped cross section attached to the inner side of the outer frame 71.

The inner frame 111 is a member formed by press-molding a plate material, and includes a bottom wall 115 and side walls 116 and 117 extending upward from both edges of the low wall 115.
The inner frame 111 and the outer frame 71 are connected by welding the side walls 116 and 117 and the lower end of the outer frame 71.

  In the present embodiment, as shown in FIG. 5, the engine hangers 25 and 26 are attached to the left and right side walls 81 and 82 of the outer frame 71, respectively. Only the engine hanger 25 (or the engine hanger 26) may be attached.

  Further, as shown in FIGS. 5 and 6, the inner frames 72 and 111 having a U-shaped cross section are attached to the inner side of the outer frame 71. You may attach to the lower end of the outer frame 71 so that it may block.

  The frame structure of the present invention is suitable for a motorcycle.

1 is a side view of a motorcycle employing a frame structure according to the present invention. It is a perspective view which shows the frame structure which concerns on this invention. It is a perspective view which shows the principal part of the frame structure which concerns on this invention. It is a principal part top view which shows the frame structure which concerns on this invention. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is sectional drawing which shows the frame structure (another embodiment) which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 25, 26 ... Stay (engine hanger), 61 ... Main frame, 72 ... Plate material (inner frame), 81, 82 ... Side wall, 81a, 82a ... Bolt insertion hole, 83 ... Bolt, 98 ... Cylindrical shape Member (color).

Claims (5)

In the frame structure of a motorcycle in which a stay is attached to the side of a U-shaped frame with the lower part opened,
Both ends are applied to the inner surface of the frame and a cylindrical member is disposed, and bolt insertion holes are opened in the left and right side walls of the frame, respectively.
A frame structure for a motorcycle, wherein the stay is fastened to the frame with a bolt penetrating the bolt insertion hole and the tubular member.   The motorcycle frame structure according to claim 1, wherein the stays are attached to the left and right side walls.   The motorcycle frame structure according to claim 1 or 2, wherein the cylindrical member is fixed to the inside of the frame by welding.   The motorcycle frame structure according to claim 1, 2 or 3, wherein a plate member is attached to a lower portion of the frame so as to block an open portion.   The motorcycle frame structure according to claim 2, 3, or 4, wherein the left and right stays extend downward in a square shape.

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