JPH0329277Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an improvement of an engine suspension system for a motorcycle.

[Technical background and problems with the idea] Motorcycles have an engine mounted at the bottom center of the frame. Generally, brackets are welded to the front and rear of the lower part of the frame, and bosses protruding from the engine case are bolted to the brackets to suspend the engine on the frame.
In addition to this, a bracket for pivoting the front end of the rear fork must be welded to the frame, and there are many welded parts, making manufacturing time-consuming. Also, when suspending a different engine on the same type of frame, the bracket must be changed to match.
This is troublesome and eliminates the commonality of frames. Furthermore, if connecting pieces are prepared for different types of engines, the number of parts and the number of fastening points will increase, which is inconvenient.

[Purpose of the invention] In view of these points, this invention inserts a spacer tube in the part where the front end of the rear fork is pivoted to the frame, welds a bracket to this spacer tube, suspends the rear part of the engine case, and attaches it to the frame. To obtain a motorcycle engine suspension system that reduces the number of welded brackets, prepares multiple spacer tubes for different types of engines, allows for common use of frames, and has fewer parts and fewer fastening points. With the goal.

[Structure of the invention] Hereinafter, embodiments of the invention shown in the drawings will be described.

There are brackets 2 on the left and right sides of the center bottom of frame 1.
Bosses 4 are welded to the left and right sides of the front end of the rear fork 3.
are attached to the left and right brackets 2 through the pivot shaft 5. The spacer tube 6 is passed through the pivot shaft 5 and placed between the left and right bosses 4 of the rear fork 3. Brackets 7 are welded to the left and right sides of the spacer tube 6 in advance. Then, the rear end of the engine case 8 is fastened to the left and right brackets 7 using bolts 9.

The rear end of the engine case 8 is fastened to the left and right brackets 7 of the spacer cylinder 6, and is fastened to the left and right brackets 2 of the frame 1 via the pivot shaft 5. Therefore, it is not necessary to separately weld a bracket for fastening the rear part of the engine case 8 to the frame 1, and the number of welded parts can be reduced. If the engines are different, it is sufficient to prepare a spacer tube 6, and the frame 1 can be used in common.

[Effects of the invention] As explained above, this invention uses a pivot shaft to attach the left and right bosses at the front end of the rear fork to the brackets provided on the left and right sides of the frame, and also attaches a spacer between the left and right bosses of the rear fork through the pivot shaft. By arranging the cylinder, welding brackets to the left and right sides of the spacer cylinder, and securing the rear end of the engine case to the brackets, there are fewer brackets to be welded to the frame, making it easier to install even when installing different engines. All you need to do is prepare a spacer tube, and the frame can be used commonly without any modification, saving you the trouble of managing parts.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being an enlarged vertical sectional plan view of the main part, and FIG. 2 being a side view. 1...Frame, 2...Bracket, 3...Rear Hawk, 4...Boss, 5...Pivot Shaft,
6... Spacer tube, 7... Bracket, 8...
engine case.

Claims (1)

[Scope of utility model registration request] The left and right bosses at the front end of the rear fork are pivotally attached to the brackets provided on the left and right sides of the frame using a pivot shaft, and a spacer tube is placed between the left and right bosses of the rear fork by passing through the pivot shaft, and the brackets are welded to the left and right sides of the spacer tube. An engine suspension system for a motorcycle, characterized in that a rear end of an engine case is fastened to the bracket.