JP2020142784A - Frame structure of bicycle - Google Patents

Abstract

To provide a technique for means for returning pedals of a bicycle faster when the pedals are stepped down.SOLUTION: Outer peripheries of a top tube and a down tube constituting a lug type bicycle titanium frame are wound with a thin belt-like carbon material to a required width in one body nearby a head lug that the top tube and down tube cross, and consequently when pedals are stepped down, a bicycle body (frame) tilts and restoring force operates in a direction in which the bicycle body returns quickly from the tilt because of the carbon material wound around the down tube, etc., and united with the titanium tube to improve rotation efficiency of the pedals, etc., thereby leading to speedup.SELECTED DRAWING: Figure 2

Description

It is about the bicycle frame structure for bicycle road racing.

In general, road racing bicycles are also known in which the frame itself is made of titanium to reduce weight and high rigidity, and carbon material has high elasticity and heat resistance.

JP-A-8-5309 It is related to the surface treatment method of the titanium bicycle frame, and the content is to mirror-finish the surface of titanium itself.
JP 2010-64508 A rug-type bicycle carbon frame that creates a new frame with different characteristics by replacing one or two of the tubes that make up the frame. It is a bicycle.

It goes without saying that it is desirable that the weight of the bicycle itself is light and rigid, such as when competing for speed in a bicycle road race, but the pedaling force to step on the petal is strong, and after stepping on the petal, the return of the petal returns quickly. So, the rotation of the petal becomes faster and it leads to speeding up, but it is indispensable to improve the efficiency of returning this petal, and the technology has not been pursued yet.

A petal is made by wrapping a thin strip of carbon material with the required width around the outer circumference of the top tube and down tube near the head angle intersected by the top tube and down tube made of a lug-type bicycle titanium frame. Stepping on and the entire vehicle body (frame) tilts to the left or right, and the restoring force of the carbon material integrated with the titanium tube wrapped around the down tube works to quickly return the tilt of the vehicle body, resulting in rotational efficiency of petals, etc. Is to improve and lead to speedup. ..

When the left and right pedals are stepped on, the vehicle body also tilts to the left or right and tries to stand up from the tilt, and the pedals that are stepped on return quickly, increasing the rotational force of the pedals, which has the effect of speeding up. It is an integrated frame made of titanium and carbon material, and is lightweight, rigid and rigid, and has excellent effects such as flexibility and heat resistance.

Overall view of the bicycle Bicycle skeleton frame structure B part enlarged detailed view B part enlarged detailed view Enlarged detailed view of c part

Embodiments of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is an overall view of the bicycle, in which the vehicle body (front wheels and rear wheels are attached to the frame, the pedals are attached at positions shifted 180 ° to the left and right, and the gears and chains of the rear wheels are attached to the center of the bicycle via gears. The saddle is fixed to the upper part of the top tube, and the handle is attached to the tip of the saddle. In FIG. 2, the top tube 1 and the down tube are shown in the skeleton state diagram of the frame. The tips of 2 are welded to the head angle 4 and integrated. A and B are welded portions, and the outer periphery thereof is covered with a thin strip-shaped carbon material as shown in the enlarged view of the portion (a).
The other end of the down tube 2 and the other end of the seat tube 3 are welded to the lug angle 5. Parts C and D are welded parts, and as shown in the enlarged view of 17 (c) part, the tip of the seat tube 3 and the other end of the top tube 1 covered with a thin strip-shaped carbon material are welded to the seat angle 6. ing. The parts E and F are welded parts, and are covered with a thin strip-shaped carbon material as shown in the enlarged view of 16 (b) parts. 7 is a rear tube up R, and 8 is a rear tube down R. Reference numeral 18 is a rear tube up L, and 19 is a rear tube down L. The rear tubes R, 7, 8 and the rear tubes L, 18 and 19 are welded to the seat angle 16 and the lug angle 17, respectively. The thin carbon material X of 15 is wound around the outer circumferences of the head angle 4, the top tube 1 and the down tube 2, and is integrated with each tube by an adhesive or the like. The thin carbon material Y of 16 has 16 seat pot carbon Y wrapped around the other end of the top tube 1, the tip of the seat tube, and the outer circumferences of the rear tube up R and the rear tube up L welded to the seat angle 6. It is integrated with an adhesive or the like. The rug carbon Z of 17 covers the other end of the down tube 2, the other end of the seat tube 3, the rear tube up R of 7 and the rear tube down R of 8 are welded to the lug angle 5. , Is integrated with adhesive, etc. The connecting portion of the 15 head carbon X, the 16 seat pot carbon Y, and the rug carbon Z acts to correct the tilt distortion of the vehicle body when the petal is stepped on, and the restoration action causes the vehicle body to perform. Auxiliary action to return to the normal position works, and the rotational force of the pedal also increases, leading to speed increase.
, The illustrated part shows a state in which a thin strip of carbon is wrapped around. It was experimentally confirmed that the strip-shaped carbon should have a thickness of 0.1 mm and a width of 10 mm to 15 mm from the positions of the head angle 4, the lug angle 5, and the seat angle 6, respectively. It is also possible to stack several sheets with a thickness of 0.1 mm, and use them according to appropriate conditions such as when you want to strongly obtain the coefficient of restitution.

1 Top tube 2 Down tube 3 Seat tube 4 Head angle 5 Rug angle 6 Seat angle 7 Rear tube up R
8 Rear tube down R
9 Drive chain 10 Front wheel 11 Rear wheel 12 Pedal 13 Handle 14 Saddle 15 Head pipe head Carbon X
16 seat pot up carbon Y
17 rug carbon Z
18 Rear tube up L
19 Rear tube down L
20 gears

Claims (4)

It is characterized by wrapping a thin strip-shaped carbon material with the required width around the outer circumference of the top tube and down tube in the vicinity of the head angle crossed by the top tube and down tube composed of a lug-type bicycle titanium frame. Bicycle frame structure It is characterized by wrapping a thin strip-shaped carbon material with the required width around the outer circumference of the down tube and seat tube in the vicinity of the lug angle that is crossed by the down tube and the seat tube, which are composed of a rug-type bicycle titanium frame. Bicycle frame structure. The feature is that a thin strip-shaped carbon material with the required width is wrapped around the outer circumference of the top tube and seat tube in the vicinity of the seat angle that is crossed by the top tube and the seat tube, which are composed of a rug-type bicycle titanium frame. Bicycle frame structure. Rug-type bicycle A bicycle characterized in that the top tube and down tube composed of a titanium frame, the down tube and seat tube, and the thin band-shaped carbon material that is integrally wrapped around the top tube and seat tube are integrated by adhesion. Frame structure.

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