JPS581099Y2 - Crossbar structure of frames of motorcycles, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a crossbar structure used when attaching an engine, a cushion unit, etc. to a frame of a motorcycle or the like.

More specifically, a hollow pipe is hung horizontally between the left and right side members of a frame of a motorcycle, etc., and a bolt part is formed on the outside of the stepped part, and a cylindrical part is formed inside the stepped part. This method simplifies the structure and facilitates work by fitting a washer plate to the hollow pipe, press-fitting this part into both ends of the hollow pipe, and simultaneously brazing each divided member through a brazing material to join them together. The present invention relates to a crossbar structure for a frame of a motorcycle, etc., which is simplified, mass-produced, and further reduced in weight and cost.

FIG. 3 shows a frame of a motorcycle. Frame 1 is shown divided into left and right halves 2, 2. These halves 2, 2 are made of press-formed steel plate material;
2 are integrated by welding.

A helad tube 3 is provided at the front end of the frame 1,
Engine mounting brackets 2a, 2a are provided below the center of the frame 1, and a crossbar 4 is horizontally suspended between them.

On the other hand, a cross bar 5 to which a carrier cushion unit is attached is horizontally suspended between the rear parts 2b and 2b of the frame 1.

The conventional structure for attaching this cross bar 1, for example 5, to the frame 1 is schematically shown in FIG. The cross bar 5 has a portion 5a that crosses the mounting holes 6, 6 having a large length and diameter, a tip portion sb, sb beyond that, a small diameter, and bolt portions 5c, 5c extending beyond the tip portion 5b. These parts are then formed integrally by forging, cutting, etc.

Since it is difficult to weld the crossbar 5 directly to the thin plate halves 2, 2, the mounting holes 6 of the crossbar 5 halves 2, 2
, 6 are provided with thick plate patches 7 at both ends of the large diameter portion 5a protruding from them.
．． 7, weld patch 7.7 to half body 2, 2,
This is done using a jig for positioning the cross bar 5, and then the patch γ, 7 and the cross bar 5 are welded 9.

The = end of the rear cushion unit is attached to the bolt portions 5c, 5c at both ends of the cross member 5, or an engine mount bracket or the like is attached.

The conventional crossbar structure described above is quite long and requires a lot of man-hours to process the loss bar, and the processing is troublesome and complicated. Welding also requires two processes: welding the patch to the frame and welding the patch to the crossbar, which requires a large number of man-hours, is troublesome, and is difficult to automate and mass-produce. Since the crossbar is a solid member, its weight is necessarily increased accordingly, making it difficult to reduce the weight of two-wheeled vehicles.

The inventors of the present invention have devised the present invention in order to effectively solve the above-mentioned problems in attaching a crossbar to a frame of a motorcycle or the like.

The purpose of this invention is to horizontally suspend a hollow pipe between the left and right side members of the frame, press-fit stepped bolts into both ends of the hollow pipe through washer plates, and simultaneously solder each divided member through a brazing material. To provide a crossbar structure for a frame of a motorcycle, etc., which is attached and integrally connected to simplify the structure, simplify work, save labor, facilitate mass production, and further reduce weight and cost.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view schematically showing a crossbar structure according to the present invention, in which a frame 11 includes side members 12, 12 made of left and right thin plates with a space inside.

Attachment holes 13 and 13 are provided at symmetrical and concentric positions of members 12 and 12.
is drilled, and the members 12, 12 of this mounting hole 13°13
A hollow pipe 14 is placed horizontally between the back surfaces of the hole 13, and the pipe 14 is concentric with the hole 13 and has the same inner diameter.

Reference numeral 15 denotes a stepped bolt, which has a bolt part 15a at one end, a flange-like step part 15b sufficiently larger than the diameter of the hole 13 in the middle, and a cylindrical mounting rod part 15c longer than the bolt part 15a at the other end. Shaped by cutting, etc.

Two bolts 15 are prepared, and the mounting rod part 15
Prepare two washer plates 16 which are provided with holes 16a that fit into the holes 16a, have a larger diameter than the stepped portion 15b, and are also thicker.

In the above, the washer plate 16 is fitted to the outer periphery of the mounting rod portion 15c of each bolt 15 through the hole 16a, and the mounting rod portion 15c protruding outward of the washer plate 16 is fitted through the mounting hole 13 of the members 12, 12. and press fit into both ends of the pipe 14.

After that, or before assembling each of the above parts, set the brazing material,
The frame with bolts 15, 15 press-fitted on both sides is placed in a brazing furnace, and each member 12, 12, 14° 15. 15, 1
6 and 16 are brazed in the furnace at the same time.

The wax portion is shown as a mesh portion 17.

By the way, the mounting rod part 15c is half-immersed in both ends of the frame member 12 and the pipe 14, and is connected to the outer surface of the member 12 and the stepped part 1.
A washer 16 with the remaining half inserted is interposed between 5c, and the inner diameter of the hole 16a of the washer plate 16 is connected to the outer periphery of the mounting rod 15c, and the washer plate 160 is connected to the outer surface of the frame 12 on both sides and the step 15c. Each end face is brazed, and a wide brazing area can be obtained.

Therefore, the brazed joint is strong and reliable, and the bolt portion 15a
is connected to one end of a cushion unit, etc., and a load is applied to this, but the stress of this load is not concentrated only on the members 12 and 12 of the frame 11, but is distributed to the washer plate 16 and the pipe 14, and Plate 16 performs the function of stress relief.

Depending on the wall thickness of the washer plate 16 and the setting of the stepped portion 15b, the amount of projection of the bolt 15 toward the outer surface of the member 12 is determined by the press-fitting limit of the bolt 15, and no positioning jig or positioning work is required.

As is clear from the above, according to the present invention, there is no need for long lengths or loss bars that cross between the members, it is only necessary to form hollow pipes and short bolts, and processing and manufacturing are easy, and each member is fitted. Since crossbars are press-fitted horizontally and brazed in the furnace at the same time, there is no need for troublesome welding work, and the crossbars of a large number of frames can be easily installed at the same time, simplifying the work, saving labor, and It enables mass production and reduces costs.

In addition, the washer plate alleviates the stress on the bolt and provides strong and reliable support for the bolt, and since the part installed between the frame members is a pipe, it is lightweight, which helps reduce the weight of the motorcycle. can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a structure according to the present invention, FIG. 2 is a sectional view of a conventional structure, and FIG. 3 is a perspective view of a frame of a motorcycle. In the drawing, 11 is a frame, 12 is a member, 14 is a pipe, 15 is a stepped bolt, and 16 is a washer plate.

Claims (1)

[Scope of utility model registration request] Cylindrical mounting of a stepped bolt in which a hollow pipe is hung horizontally between the left and right plate members of a frame of a motorcycle, etc., and a bolt part is formed on the outside of the stepped part and a cylindrical mounting rod part is formed inside the stepped part. A crossbar for a frame of a motorcycle, etc., characterized in that a washer plate is fitted to the part, the part is press-fitted to both ends of the hollow pipe, and each divided part is simultaneously brazed and joined together. structure.