WO2022228593A1 - Bicycle fork - Google Patents
Bicycle fork Download PDFInfo
- Publication number
- WO2022228593A1 WO2022228593A1 PCT/DE2021/000079 DE2021000079W WO2022228593A1 WO 2022228593 A1 WO2022228593 A1 WO 2022228593A1 DE 2021000079 W DE2021000079 W DE 2021000079W WO 2022228593 A1 WO2022228593 A1 WO 2022228593A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fork
- area
- legs
- fork legs
- steerer tube
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 235000019476 oil-water mixture Nutrition 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K21/00—Steering devices
- B62K21/02—Front wheel forks or equivalent, e.g. single tine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K19/00—Cycle frames
- B62K19/02—Cycle frames characterised by material or cross-section of frame members
- B62K19/04—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly metallic, e.g. of high elasticity
- B62K19/06—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly metallic, e.g. of high elasticity tubular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K19/00—Cycle frames
- B62K19/18—Joints between frame members
- B62K19/28—Means for strengthening joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K21/00—Steering devices
- B62K21/04—Fork crowns
Definitions
- the invention relates to a front fork for a bicycle, which is particularly suitable for a BMX bike or a mountain bike.
- the front fork is a component of a bicycle which connects the front wheel to the bicycle frame.
- the front fork usually comprises a head tube designed as a vertical tube that is routed through the bicycle frame, a fork crown that is attached to the lower end of the head tube, and two fork legs that are connected to the fork crown and each have means for fastening at their lower end Have recording the axle of the front wheel of the bicycle.
- front forks for bicycles have a double bridge fork.
- a double bridge fork is formed by two spaced apart and parallel fork bridges, through which two substantially parallel fork legs are guided.
- the front fork is thus exposed to high forces that can have a negative effect on the stability and durability of this two-wheeler part.
- the steering tube can be damaged when driving forwards or backwards.
- the fork crown can be damaged by high axial loads or the connection between the head tube and the fork crown can crack or
- a front fork for a bicycle is known from German utility model DE 20 2008 001 739 U1, in which the fork legs are connected to the fork crown and have a rib which is arranged on the inside of an upper section from the fork legs
- this design also consists of a fork tube, a fork crown and two fork legs that are connected to one another and where damage can occur in the connecting areas of these components under high loads.
- a bicycle fork and a bicycle frame with a bicycle fork are known from the German utility model DE 20 2013 104 420 U1, in which the lower area of the steerer tube has at least one flattening. This flattening is intended to significantly increase the lateral rigidity of the steerer tube in order to increase its resilience and durability.
- German utility model DE 20 2006 011 859 U1 which comprises a steerer tube and two fork legs made of fiber-reinforced material and the fork legs each have two abutting inner tubes and an outer tube fitted onto the two inner tubes and the abutting portions of the two inner tubes forming a rib.
- structural strength is increased by nesting multiple tubes together and reinforcing the junction areas between the tubes by winding prepegs.
- the disadvantage of this construction is that the structural strength is essentially dependent on the number of prepregs used and that not only the structural strength but also the weight of the front fork is increased with an increasing number of turns of the prepregs.
- the object of the invention is therefore to create a front fork for a two-wheeler, in particular for a BMX bike or a mount bike, in which the structural strength in the area where the steerer tube is connected to the fork legs is significantly increased and which has the lowest possible weight.
- the front fork according to the invention comprises a steerer tube with an upper and a lower region.
- the steerer tube essentially consists of a vertical tube and can be made in one piece or in several pieces.
- the front fork according to the invention has two fork legs, each with an upper and a lower area.
- the fork legs can also be made in one piece or in several pieces.
- Means for receiving a wheel axle are arranged at the bottom of the fork legs. With these stuffs it is a recording in which the wheel axle can be used and then fixed with fasteners.
- At least the lower area of the steerer tube and the upper areas of the fork legs are designed as one component.
- the lower area of the steerer tube and the upper areas of the fork legs are therefore not--as is known in the prior art--designed as separate components that are welded or soldered to one another.
- This component can be produced, for example, by means of the hydroforming process, in which a hot complex shapes of pipes can be formed from oil-water mixtures in hollow moulds.
- the design as a single component avoids the weak points of a known front wheel fork, since in this highly stressed area there are no connecting seams between several components that could become detached from one another again when high loads occur.
- the upper areas of the fork legs are formed laterally on the lower area of the steerer tube.
- the lower region of the steerer tube is designed as a tube that completely penetrates the component.
- the molded areas of the fork legs encompass the fork shaft at the sides. In this way, a particularly large contact surface is created between the molded areas of the fork legs and the fork shaft.
- the component gains in strength and rigidity as the contact area between the steerer tube and the fork legs increases.
- the diameter of the upper regions of the fork legs decreases in the direction of the lower region of the fork legs.
- the most heavily loaded part of the component is thus reinforced by a larger diameter, while the diameter of the fork legs in the less heavily loaded areas tapers to create a filigree shape and to save material and weight.
- the cross section of the fork legs has an essentially oval shape, at least in the area which is formed on the fork shaft.
- the contact surface between the fork legs and the fork shaft is significantly larger than with a round shape.
- the cross section of the fork legs, which is formed on the steerer tube also essentially have a teardrop shape, in which the cross section of the fork legs tapers in the direction of the wheel hub.
- This embodiment also results in an increased contact area between the fork legs and the steerer tube, while at the same time saving material and weight.
- an embodiment is particularly preferred in which the cross section of the fork legs, which is formed on the steerer tube, is designed to be as round as possible in the upper area, the lower area of the cross section tapers and in the lowest area with a largely flat surface Surface forms a floor. In practical tests, this embodiment has proven to be the best and allows for a high degree of stability and rigidity.
- an embodiment of the front fork according to the invention in which the upper area of the fork legs forms a rib that runs from the area of molding on the steerer tube in the longitudinal direction.
- the rib runs on the side surface of the fork legs towards the lower part of the fork legs.
- the rib ends in the contact area between these areas.
- the lower part of the fork leg has a conical shape that tapers in the direction of the means for receiving the wheel hub.
- the lower area of the fork legs can also be designed as an evenly running tube.
- the front fork is made of chromium and molybdenum alloy steel at least in the area of the central component, which consists of the lower area of the steerer tube and the upper areas of the fork legs.
- Chrome-molybdenum steel is characterized in particular by its toughness, abrasion resistance and impact resistance.
- this steel has a high strength-to-weight ratio and high torsional strength, making it an ideal material for heavy-duty front forks on BMX bicycles and/or mountain bikes.
- FIG. 1 shows a front view of the front fork according to the invention.
- FIG. 1 shows a steerer tube (1) with an upper and a lower area (T, 1′′), which is designed as a tube (4).
- the lower area of the steerer tube (1") penetrates the upper area (2') of the fork legs (2).
- the fork legs (2', 2") are formed laterally on the lower area of the steerer tube (1").
- the molded areas of the fork legs (5.5") enclose the tube (4) of the steerer tube (1).
- the diameter of the upper area (6) of the fork leg (2) decreases towards the lower area of the fork leg (2").
- FIG. 1 also shows ribs (10) starting from the area where the fork legs are formed on the fork shaft (5, 5') and ending in the direction of the lower area of the fork legs.
- Means for receiving a wheel axle are arranged in each case on the lower area of the fork legs.
- FIG. 2 shows a front wheel fork according to the invention in a side view, in which in particular the means for receiving the wheel axle are clearly visible.
- FIG. 3 shows the component with the lower area of the steerer tube (1′′) and the upper areas of the fork legs (2′′) formed thereon.
- the diameter of the fork legs (6) decreases from the molded area on the steerer tube towards the lower area of the fork legs (2").
- a rib (10) arranged in each case can also be seen in FIG. 3 in this area.
- FIG. 4 shows a cross section of a fork leg (7, 7′, 7′′, 7′′′′) in the area where it is formed on the steerer tube (5, 5′).
- the cross section of the fork leg (7, 7′, 7′′, 7′′′) is largely round in the upper area, while the lower area of the cross section tapers and forms a floor in a largely flat surface.
- a rib (10) is formed in the transition area between the upper round area and the taper.
- the cross-section has a largely oval shape reminiscent of an inverted teardrop shape (9).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Axle Suspensions And Sidecars For Cycles (AREA)
- Steering Devices For Bicycles And Motorcycles (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2021/000079 WO2022228593A1 (en) | 2021-04-29 | 2021-04-29 | Bicycle fork |
DE112021007605.1T DE112021007605A5 (en) | 2021-04-29 | 2021-04-29 | BICYCLE FORK |
TW111116014A TW202300383A (en) | 2021-04-29 | 2022-04-27 | Front fork for a bicycle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/DE2021/000079 WO2022228593A1 (en) | 2021-04-29 | 2021-04-29 | Bicycle fork |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022228593A1 true WO2022228593A1 (en) | 2022-11-03 |
Family
ID=76197209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2021/000079 WO2022228593A1 (en) | 2021-04-29 | 2021-04-29 | Bicycle fork |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE112021007605A5 (en) |
TW (1) | TW202300383A (en) |
WO (1) | WO2022228593A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD1000321S1 (en) * | 2022-04-22 | 2023-10-03 | Newtton | Bicycle or motorcycle fork |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1196662A (en) * | 1958-04-19 | 1959-11-25 | Fork for bicycles, mopeds and the like | |
WO1991001246A1 (en) * | 1989-07-19 | 1991-02-07 | Cycle Composites, Inc. | Cycle fork with fiber reinforced resin blades and crown and method of making same |
DE29915091U1 (en) * | 1999-06-09 | 1999-12-09 | Chi, Yi-Chen, Hou Li, Taichung | Bicycle front fork with a wreath section |
DE202006011859U1 (en) | 2005-09-16 | 2006-12-21 | Yuan Min An Enterprise Co., Ltd., Feng Yuan | Front fork for a bicycle comprises a vertical tube made from fiber-reinforced material and two arms made from fiber-reinforced material and extending from a lower side of the vertical tube |
DE202008001871U1 (en) | 2008-02-11 | 2008-06-26 | Yuan Min An Enterprise Co., Ltd., Fong Yuan | Upper frame of a front fork for a bicycle |
DE202008001739U1 (en) | 2008-02-08 | 2008-07-03 | Yuan Min An Enterprise Co., Ltd., Fong Yuan | Front fork for bicycle |
US7591474B1 (en) * | 2006-07-19 | 2009-09-22 | Bear Corporation | Bicycle fork and steering tube |
DE202013104420U1 (en) | 2013-09-27 | 2015-01-08 | Rose Versand Gmbh | Bicycle fork and bicycle frame with a bicycle fork |
CN104494766A (en) * | 2014-12-25 | 2015-04-08 | 深圳市昌威鑫五金科技有限公司 | Front fork and bicycle employing same |
EP3812257A1 (en) * | 2019-10-25 | 2021-04-28 | Cycling Sports Group, Inc. | Noncircular steerer tube and coupler |
-
2021
- 2021-04-29 WO PCT/DE2021/000079 patent/WO2022228593A1/en active Application Filing
- 2021-04-29 DE DE112021007605.1T patent/DE112021007605A5/en not_active Withdrawn
-
2022
- 2022-04-27 TW TW111116014A patent/TW202300383A/en unknown
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1196662A (en) * | 1958-04-19 | 1959-11-25 | Fork for bicycles, mopeds and the like | |
WO1991001246A1 (en) * | 1989-07-19 | 1991-02-07 | Cycle Composites, Inc. | Cycle fork with fiber reinforced resin blades and crown and method of making same |
DE29915091U1 (en) * | 1999-06-09 | 1999-12-09 | Chi, Yi-Chen, Hou Li, Taichung | Bicycle front fork with a wreath section |
DE202006011859U1 (en) | 2005-09-16 | 2006-12-21 | Yuan Min An Enterprise Co., Ltd., Feng Yuan | Front fork for a bicycle comprises a vertical tube made from fiber-reinforced material and two arms made from fiber-reinforced material and extending from a lower side of the vertical tube |
US7591474B1 (en) * | 2006-07-19 | 2009-09-22 | Bear Corporation | Bicycle fork and steering tube |
DE202008001739U1 (en) | 2008-02-08 | 2008-07-03 | Yuan Min An Enterprise Co., Ltd., Fong Yuan | Front fork for bicycle |
DE202008001871U1 (en) | 2008-02-11 | 2008-06-26 | Yuan Min An Enterprise Co., Ltd., Fong Yuan | Upper frame of a front fork for a bicycle |
DE202013104420U1 (en) | 2013-09-27 | 2015-01-08 | Rose Versand Gmbh | Bicycle fork and bicycle frame with a bicycle fork |
CN104494766A (en) * | 2014-12-25 | 2015-04-08 | 深圳市昌威鑫五金科技有限公司 | Front fork and bicycle employing same |
EP3812257A1 (en) * | 2019-10-25 | 2021-04-28 | Cycling Sports Group, Inc. | Noncircular steerer tube and coupler |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD1000321S1 (en) * | 2022-04-22 | 2023-10-03 | Newtton | Bicycle or motorcycle fork |
Also Published As
Publication number | Publication date |
---|---|
TW202300383A (en) | 2023-01-01 |
DE112021007605A5 (en) | 2024-02-15 |
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