WO2013037369A1

WO2013037369A1 - Bicycle frame

Info

Publication number: WO2013037369A1
Application number: PCT/DE2012/100286
Authority: WO
Inventors: Karsten BETTIN
Original assignee: Bettin Karsten
Priority date: 2011-09-18
Filing date: 2012-09-18
Publication date: 2013-03-21
Also published as: DE102011053733A1; DE102011053733B4

Abstract

Bicycle frame (1) made of an extruded hollow profile that is subdivided by two inner walls (1a, 1b) running from the upper side to the underside of the bicycle frame into two outer segments (1c, 1d) and an inner segment (1e), for connection to a rear wheel drive (3) containing an output wheel (5) of a transmission using a traction means or gear wheels, a rear wheel (2) and a rear wheel shaft (4) driven by the output wheel and driving the rear wheel, wherein the rear wheel drive is connected to at least one arm (1f) of the bicycle frame formed by an outer segment, characterized in that the arm and any fork ends connected to the arm are arranged, viewed in the axial direction, between the output wheel and the seat (4a) of the rear wheel on the rear wheel shaft and in that the two outer segments and the inner segment of the bicycle frame run parallel to one another over their entire length. It is advantageous that, due to the arrangement of the drive wheel and the output wheel of the bicycle drive on the same outer side of the bicycle frame, belt drives and gear wheel transmissions can be used.

Description

bicycle frame

Technical area

The invention relates to a bicycle frame according to the preamble of claim 1 of an extruded hollow profile with two outer segments and an inner segment, which are formed by two extending from the top to the bottom of the bicycle frame walls.

PRIOR ART Various bicycle frames made of extruded profiles are known:

EP 0 583 221 A1 discloses a bicycle frame comprising a head tube, a seat tube and a frame tube, wherein the frame tube is a frame tube pair and at least one of said components is made of an extruded profile.

This bicycle frame has the following disadvantages: - The bicycle frame is suitable for bicycles, as a traction mechanism as

Use drive system, wherein the drive wheel and the output gear of the traction mechanism must be arranged on different sides of the bicycle frame, since the two frame tubes are not exactly parallel.

- It is at least a two-part frame tube pair required because the two frame tubes from the dropouts of the rear wheel at an acute angle to the head tube.

- The bicycle frame can be made foldable for the construction of folding wheels by design only with great effort.

- Since the frame width on bottom bracket height is by design so large that the chain line and the sprocket of a drive system would cut the bicycle frame, if they were seen from the ground at the same height with the bicycle frame, that must

Sprocket by means of a separate dropout (for example, by means of the extruded profile provided here for receiving the seat tube) are arranged so far below the frame tube pair that it does not cut the bicycle frame, and the upper chain strand must still be performed below the bicycle frame through the output sprocket can cut without the bicycle frame. This results in the disadvantage that the bicycle frame is executable only for wheel sizes of 20 inches and larger.

Also in US 6,139,038 A frame tube pairs are used, which seen from the reference center plane from the steering head tube to the rear wheel to the outside with the disadvantages described above.

From FR 2 665 678 AI a bicycle with a manufactured from a hollow profile with three chambers bicycle frame is known, the outer chambers accommodate the two dropouts of the rear wheel. This bicycle frame has the disadvantage that due to design separate dropouts for receiving the rear wheel are required and that the

Dropouts of the rear wheel outwards and downwards to accommodate the rear wheel can and order the output sprocket of the chain drive between the frame and rear wheel can. In addition, the frame tube runs with three chambers far above the bottom bracket, which separate frame tubes for mounting the bottom bracket are required. From WO 2011/033505 AI is a bicycle frame with two opposite

Frame side parts known, wherein the frame side parts can be carried out as extruded profiles, which are connected in the middle with spacer elements. This bicycle frame has the disadvantage that it consists of at least two frame side parts and separate spacers are provided between the two frame side parts. In addition, there is either the disadvantage that the frame side parts in the region of the rear wheel are not parallel to the reference center plane of the bicycle, which two separate

Frame parts are required as Hinterbaustreben or the frame must be bent outwards in the region of the rear wheel, whereby the use of extruded hollow sections is problematic. Or, moreover, there is the disadvantage that the

Although the frame side parts run parallel to the reference center plane of the bicycle, but that the different width of the frame, which is provided by the design, is at the height of the frame

Bottom bracket or at the level of the rear wheel must be achieved by removing the outer chambers of the extruded Hohlprofüs in the bottom bracket, while the inner chambers of the extruded hollow sections are removed in the rear wheel, which destabilizes the frame. Another disadvantage is the fact that to increase the frame stability then open to the bottom bracket outer chamber with separate parts, such as sheets, must be closed again. From WO 99/19201 Al a bicycle frame with frame members made of extruded profiles is known, which are at least partially outside cylindrical, elliptical or curved and inside have flat surfaces that act as connecting surfaces for connections with corresponding dropouts or with the frame parts connecting components. This

Bicycle frame has the design-related disadvantages that at least three frame parts are required that the bottom bracket connects the bearing frame parts together and thus must take over the bicycle frame stabilizing function that the connecting components must be elaborately formed on the contours of the frame parts that for receiving the rear wheel two outwardly extending rear struts are required and that the connection of the rear struts with the supporting

Bottom bracket housing is very close to the bottom bracket shell, so this connection must be made very stable due to the bending moment loads occurring there.

From WO 99/59865 AI a bicycle frame is known which consists of an extruded

Hollow profile can be produced and having four segments, wherein two outer segments form the outwardly curved rear struts and a lower segment bent down and out before the rear wheel to the bottom bracket and connected to the bottom bracket and removes the fourth inner segment in the region of the rear wheel is. The two

Rear struts are provided with grooves in which the rear wheel axle with the

Rear struts is attached. A disadvantage of this bicycle frame is that the inclusion of the rear wheel and the positioning of the bottom bracket is only achieved by the fact that the individual segments of the extruded profile must be bent, which is associated with high manufacturing costs and thus the individual segments are significantly weakened in their strength.

Bicycles and bicycle frames, which provide a lying outside the bicycle frame drive sprocket and a lying between the bicycle frame and rear driven sprocket, have the disadvantage that the two rear struts of the bicycle frame seen from the bottom bracket must extend outward and thus can not run parallel. The resulting manufacturing effort is correspondingly high. In addition, these bicycle frame have the disadvantage that the distance between bottom bracket and rear axle must be at least so large that enough space remains to guide the rear strut between the drive sprocket and the driven sprocket axially from the inside out. Examples thereof can be found in CH 227487 A, JP 59166334 A, GB 804 549 A, DE 955 201 B, FR 2 665 678 A1, DE 195 47 988 A1 and in US Pat. No. 5,762,353 A. Bicycles and bicycle frames that receive drive sprocket and driven sprocket within a chain box, wherein at least the inner side of the chain box as part of the frame at the same time is the rear wheel bearing part, either have the disadvantage that for the production of the bicycle frame part, the Bottom bracket and the rear wheel receives consuming, usually cast, large and with appropriate wall thickness dimensioned parts are required, the chain case for mounting reasons is an axially split box with two parts that are detachably connected together. Examples can be found in EP 1 600 368 A2, US 2005/0263979 A1, WO 2005/039962 A1, US Pat. No. 7,584,978 B2 and US 2006/0175797 A1. Or these bicycles have in the case of a chain box, which consists of a box section or box-like construction, the disadvantage that the chain is guided within the chain box and thus the achievable gear ratio between the drive sprocket and output sprocket for small wheels is very low in that the box profile or the box profile-like structure of the rear strut in which the gear stage is housed has a limited height, and thus at least a second gear stage within the frame must be realized in order to achieve an adequate deployment. Examples can be found in US 5,186,482 A, US 3,979,136 A and US 6,267,401 Bl. Moreover, there is the disadvantage in these bicycle frame that no standard bottom bracket or not used mainly for bicycles bottom bracket can be used because the outside of the chain box has a greater distance to the reference center plane of the bicycle than the chain line, while commercial or widely used predominantly Bottom bracket require a bicycle frame that leads the catenary outside the bicycle frame. In addition, US 5,186,482 A has the disadvantage that a

Double chain drive is realized and thus a large distance between the rear wheel axle and bottom bracket axle must be taken into account. In US 3,979,136 A has the disadvantage that a provided at the height of the bottom bracket spur gear is used with the disadvantage that a complex sheet metal construction must be provided and for the rear struts no cost producible Rohrpro file can be used. In US 6 267 401 Bl no further details were made. Presentation of the invention

The invention has for its object to provide a cost-producible, consisting of a few parts bicycle frame, which is particularly suitable for bicycles with wheels of size 16 inches and smaller and can be installed in the cost savings, the rear wheel as possible without additional dropouts.

To solve this problem in a generic bicycle frame serve

characterizing features of claim 1.

Further advantages of the invention are a. that driving and driven gear of the bicycle drive on the same outer side of the

Bicycle frame are arranged, which also belt drives and gear transmission can be used as a drive system. b. in that the hollow profile in the outer segments has stabilizing transverse walls which support the transverse forces acting on the bicycle frame. c. that the bottom bracket can be connected directly to the bicycle frame because

Rear axle, Bottom bracket and Steuerkopfrohrmitte almost on a straight or evenly curved line. d. that the bicycle frame can be made foldable. e. that the bicycle frame is suitable for use commercially available bottom bracket.

Brief description of the drawings

Fig. 1 shows the view of a first preferred embodiment of the bicycle frame with a one-armed rear strut and a hollow profile having three functional segments.

Fig. 2 shows the view of the preferred embodiment of Fig. 1 with the am

Bicycle frame attached components rear wheel drive, rear wheel, bottom bracket, crank, drive wheel and driven wheel of a chain drive, steerer, front fork, front wheel and seat tube.

FIG. 3 shows a preferred embodiment of the hollow profile of the bicycle frame from FIG. 1. Fig. 4 shows a view of the bicycle frame of Fig. 1 with the connected to the bicycle frame components rear wheel drive and steerer.

Fig. 5 shows the hollow profile of a second preferred embodiment of the bicycle frame with three functional segments. Fig. 6 shows the exploded view of the second preferred embodiment of

Bicycle frame as foldable bicycle frame with hinged joint, with dropouts to which a rear wheel drive is attached, and with double - sided suspension of the rear wheel in the

Bicycle frame.

Fig. 7 shows a third preferred embodiment of a narrower bicycle frame with a one-armed rear strut and a Hohlpro fil with three functional segments.

Best Mode for Carrying Out the Invention and Preferred Embodiments

1 shows the view of a first preferred embodiment of a bicycle frame 1.

FIG. 2 shows the bicycle frame 1 with the components directly or indirectly connected to the bicycle frame 1: a rear wheel 2, a rear wheel drive 3 with a rear wheel shaft 4 and an output wheel 5, a drive wheel 6, a bottom bracket housing 7, a bottom bracket 8

Steerer 9, a headset 10, an upper support member 11, a lower support member 12, a front fork 13, a front wheel 14, a seat tube 15, an upper support member 16 and a lower support member 17. The drive wheel 6 is connected to the commercially available bottom bracket 8, that about the

Bottom bracket 7 is in turn connected to the bicycle frame 1.

FIG. 3 shows the hollow profile of the bicycle frame 1.

Fig. 4 shows a view of the bicycle frame 1 produced from a Hohlprofü with the connected to the bicycle frame 1 components rear wheel drive 3, by means of

Fixing screws 18 is connected to the bicycle frame 1, and steerer 10, which is supported via the headset 11 to the support members 12 and 13, which in turn are fixedly connected to the bicycle frame 1.

The hollow profile includes two extending from the top of the bicycle frame 1 to the bottom of the bicycle frame 1 inner walls la and lb, which divide the hollow profile of the bicycle frame 1 in two outer segments lc and ld and an inner segment le. According to a particular feature of the invention, the segments lc and le of Hohlpro fils of the bicycle frame 1 in the region of the rear wheel 2 are removed, so that the remaining outer segment ld of the Hohlpro fils forms an arm lf of the bicycle frame on which the

Rear wheel drive 3 is connected to the bicycle frame 1. The rear wheel drive 3 has a bearing, not shown here, the radially outside of the bicycle frame 1 and the

Rear wheel shaft 4 radially inside stored. The rear wheel 2 is at a seat 4a of

Rear wheel shaft 4 connected to the rear wheel shaft 4. The rear wheel drive 3 has the output gear 5, which is designed in this exemplary embodiment as an output sprocket and which drives the rear wheel 2 via the rear wheel shaft 4. The driven gear 5 is of the

Drive wheel 6, driven in this embodiment by a drive sprocket, which is connected to a crank, via a chain, not shown. According to a particular feature of the invention, the bicycle frame 1 is disposed between the output gear 5 of the rear wheel drive 3 and the seat 4a of the rear wheel 2 on the rear wheel shaft 4. According to a further special feature of the invention, both the drive wheel 6 and the driven gear 5 of the Zugmittel- or the gear transmission on the same, the rear wheel 2 opposite side of the arm lf of the bicycle frame 1 are arranged.

According to a particular feature of the invention, at least the outer segment ld of the hollow profile on inner transverse walls lg to Im, which support the required mounting force of the fastening screws used for the fastening of the rear wheel drive 3 18. This makes it possible according to a further special feature of the invention, the rear wheel drive 3 without further dropouts directly to the bicycle frame 1 to connect, since the inner transverse walls lg to Im sufficiently supported on the bicycle frame 1 in the region of the rear wheel drive 3 transverse forces, so that a denting of the bicycle frame 1 is avoided. It is also possible and encompassed by the invention that the

Rear wheel drive 3 not solvable, but is firmly connected to the bicycle frame 1.

According to a particular feature of the invention, the segments lc, ld and le of the hollow profile parallel to the reference center plane of the bicycle, wherein in the embodiment shown in Fig. 1 to Fig. 4, the width of the hollow profile of the bicycle frame 1 corresponds approximately to the width of the bottom bracket 7. This standard commercial bottom bracket can be used. According to another particular feature of the invention, the bicycle frame 1 no separate control tube. Rather, the headset 10 is supported on the upper support member 11 and the lower support member 12, which are fixedly connected to the bicycle frame 1. Optionally, additionally a control tube can be fixedly connected to the support elements 11 and 12.

In the same way, the seat tube 15 is moved, which is connected via the upper support member 16 and the lower support member 17 fixed to the bicycle frame 1. For reasons of space and for attachment of other components, the hollow profile

Preferably plane, orthogonal to the roadway standing side surfaces and is thus preferably designed as a box or box-like profile.

Fig. 5 shows the hollow profile of a second preferred embodiment of a bicycle frame.

Fig. 6 shows the exploded view of this second preferred embodiment of the

Bicycle frame. The hollow profile of a rear frame part 19 of the bicycle frame also has two from the top to the bottom of the rear frame member 19 extending inner walls 19a and 19b, which divide the hollow profile of the rear frame member 19 in two outer segments 19c and 19d and an inner segment 19e. In this embodiment, only the inner segment 19 e of the Hohlpro fils of the rear frame member 19 is removed at the rear end of the rear frame member 19 in the region of the rear wheel, not shown here.

This results in the rear struts two arms 19f and 19g, which are connected in this embodiment with two dropouts 20 and 21, in which the not shown here

Rear wheel drive is attached to both sides of the rear wheel with suitable fasteners 22. According to a particular feature of the invention, the dropouts 20 and 21 form a rectilinear extension of the arms 19f and 19g, respectively.

According to another particular feature of the invention, the bicycle frame is foldable executed with a front frame member 23 and the rear frame member 19. For this purpose, the bicycle frame horizontally seen approximately in the middle of the distance between the rear wheel axle and front wheel axle of the bicycle on a hinged joint 24, the one lateral folding of the bike so allows the rear wheel and front wheel in the folded state are largely congruent next to each other.

For the front frame member 23 and other hollow profiles can be used

(For example, round or oval profiles or box-like profiles), which in turn are connected by welding or soldering with a steering head tube. These embodiments are also encompassed by the invention. Furthermore, this embodiment according to a special feature of the invention

Control head tube 25, wherein two parallel protruding from the head tube 25 arms 25 a and 25 b of the control head tube 25 are inserted into two outer chambers formed by the outer segments 23 a and 23 b of the front frame member 23 at the front end. Fig. 7 shows a third preferred embodiment of a bicycle frame 26 with a hollow profile with three functional segments 26a, 26b and 26c, wherein the segment 26c acts as a one-armed rear strut. In contrast to Fig. 1, the width of the hollow profile is selected so narrow that the not reaching to the rear wheel outer segment 26a of the hollow profile lies in the reference center plane of the bicycle according to a special feature of the invention in this embodiment. This has the advantage that horizontally acting on the front wheel and thus a control head tube 27 impact forces by the stable in the

Reference center plane lying segment 26 a of the bicycle frame 26 can be collected. In the same way, a seat tube 29 is connected to the bicycle frame 26. In this

Embodiment are both the control head tube 27, the seat tube 29 and a

Bottom bracket housing 28 connected by welds with the bicycle frame 26.

The invention also encompasses all embodiments in which the two outer segments of the hollow profile and / or the inner segment of the hollow profile are again subdivided by further walls or in which the hollow profile has additional profile elements located outside the cavities (eg for cable guidance Etc.). It is understood that the embodiments shown in FIGS. 1 and 7 can also be made foldable with the same principles as in FIG. 6. To accommodate the hinged joints, the transverse walls (in Fig. 1, the transverse walls lg to Im) in the outer segments to be removed at the appropriate location. These embodiments are also encompassed by the invention. Within the scope of the claimed features of the bicycle frame, the invention also encompasses all combinations with frame parts of others, not separately described here.

Claims

claims

1. Bicycle frame

from an extruded hollow profile,

comprising at least two from the top of the bicycle frame (1; 19, 23; 26) to the underside of the bicycle frame (1; 19, 23; 26) within the hollow profile

19a, 19b) dividing the extruded hollow profile into two outer segments (lc, ld; 19c, 19d; 26a, 26c) and an inner segment (le, 19e, 26b), at least all of which Within the hollow profile extending walls (la, lb; 19a, 19b) interconnecting walls of the extruded hollow profile in the region of a rear wheel (2) are removed, for connection to a rear wheel drive (3), containing a driven gear (5) of a Zugmittel- or gear transmission , the rear wheel (2) and a rear wheel shaft (4) driven by the driven wheel (5) and driving the rear wheel (2), wherein either the rear wheel drive (3) without the use of further dropouts directly with at least one arm (lf) of the bicycle frame (1, 26) which is formed of at least one outer segment (ld, 26c) of the extruded hollow profile, or wherein between the rear wheel drive and at least one of an outer segment (19c, 19d) of the extruded hollow profile formed arm (19f, 19g) of the bicycle frame (19) a dropout (20, 21) which is connected to the rear wheel drive, with the arm (19f, 19g) is connected, characterized in that by the outer segment (ld; 19c, 19d; 26a, 26c) of the extruded hollow profile formed arm (lf; 19f, 19g) and the eventual with this arm (lf; 19f, 19g) dropout (20, 21) axially between the output gear (5) of the rear wheel drive (3) and the seat (4a) of the rear wheel (2) are arranged on the rear wheel shaft (4) and that the two outer segments (lc, ld; 19c, 19d; 26a, 26c) and the inner segment (le; 19e; 26b) of the bicycle frame (1; 19, 23; 26) run parallel to one another over their entire length.

2. Bicycle frame according to claim 1, characterized in that the segments (lc, ld, le;

19c, 19d, 19e; 26a, 26b, 26c) of the hollow profile of the bicycle frame (1; 19, 23; 26) extend parallel to the reference center plane of the bicycle.

3. bicycle frame according to claim 1 or 2, characterized in that the bicycle frame

(1; 19, 23; 26) requires an arrangement of the drive wheel (6) and the output gear (5) of the traction mechanism or gears of the gear train on the same outer side of the bicycle frame (1; 19,23; 26).

4. Bicycle frame according to one of claims 1 to 3, characterized in that a

Bottom bracket (8) without further dropouts in the bicycle frame (1, 19, 23, 26) is attached.

5. Bicycle frame according to one of claims 1 to 4, characterized in that a

Bottom bracket housing (7, 28) for receiving the bottom bracket (8) within the bicycle frame (1, 19, 23, 26) is fixedly connected thereto.

6. bicycle frame according to one of claims 1 to 5, characterized in that the width of the hollow profile corresponds approximately to the width of the bottom bracket shell (7).

7. bicycle frame according to one of claims 1 to 6, characterized in that the

Hohlpro fil next to the top and the bottom of the bicycle frame (1, 26) forming walls in at least one outer segment (lc, ld; 26a, 26c) at least two serving for stabilization walls (lg, lh, li, lj, lk, Im ) to the mutual

Connection of extending from the top to the bottom of the bicycle frame (1, 26) within the hollow profile extending wall (la, lb) and the outer wall of the outer segment (lc, ld; 26a, 26c).

8. Bicycle frame according to one of claims 1 to 7, characterized in that a

Control head tube (25) has two arms (25a, 25b), which on both sides of the

Steering head tube (25) are each connected to an outer segment of the hollow profile.

9. bicycle frame according to claim 8, characterized in that the arms (25 a, 25 b) of the steering head tube (25) on both sides of the steering head tube (25) respectively inserted into a chamber formed by the respective outer segment (23 a, 23 b) of the hollow profile and are firmly connected with them.

10. bicycle frame according to one of claims 1 to 9, characterized in that the

Rear axle, the bottom bracket and the center of the steering head tube (25, 27) seen laterally between the extended through the top of the bicycle frame (1; 19, 23; 26) and through the underside of the bicycle frame (1; 19, 23; Lines are lying.

11. bicycle frame according to one of claims 1 to 10, characterized in that on the upper side of the bicycle frame (1; 19, 23; 26) and on the underside of the bicycle frame (1; 19, 23; 26) fixed to the bicycle frame (1 19, 23, 26) are arranged, which have circular recesses in which a steerer tube (9) is rotatably mounted via a suitable headset (10).

12. Bicycle frame according to one of claims 1 to 1 1, characterized in that that outer segment (lc, 26a) of the Hohlpro fils, not between the output gear (5) of the traction mechanism or the gear transmission and the seat (4a) of the rear wheel ( 2) on the rear wheel shaft (4), in the region of the rear wheel (2) is removed, whereby the bicycle frame (1, 26) via exactly one of the in the region of the rear wheel (2) remaining outer segment (ld, 26c) of Hohlpro fils formed arm (lf) with the rear wheel drive (3) is connected.

13. bicycle frame according to one of claims 1 to 12, characterized in that that outer segment (26 a) of the hollow profile of the bicycle frame (26), which is not between the output gear of the traction mechanism or the gear transmission and the seat of

Rear wheel is arranged on the rear wheel shaft, in the reference center plane of the

Bicycle frame (26) is arranged.

14. Bicycle frame according to one of claims 1 to 13, characterized in that the

Bicycle frame (1; 19, 23; 26) is carried out in Einzelträgerbauart.

15. Bicycle frame according to one of claims 1 to 14, characterized in that the

Bicycle frame (19, 23) seen horizontally approximately in the middle of the distance between the rear wheel axle and front wheel axle of the bicycle in a front frame member (23) and a rear frame member (19) divided and provided with a hinged joint (24).

16. bicycle frame according to claim 15, characterized in that the hinged joint (24) inserted into the two chambers formed by the outer segments (23 a, 23 b) of the hollow profile and is firmly connected thereto.