DE10348735A1 - Frame for especially for mountain bike or trekking bike has swinging bearing housing accommodated in cut-out in support tube connected to bottom bracket bearing housing - Google Patents

Abstract

The bicycle frame has down tube to which is connected a bottom bracket bearing housing (12) above which is located a swinging bearing housing (32) which is accommodated in a cut-out in the support tube (10) connected to the bottom bracket bearing housing. The housing is open in the direction of the swinging bearing housing and is manufactured by the cutting out of a tube section from the support tube. The swinging bearing housing may be welded to the support tube, and the bottom bracket bearing housing is connected especially in one piece to the swinging bearing housing.

Description

The invention relates to a bicycle frame, in particular a mountain bike or Trekking frame.

Especially bicycles that in uneven terrain are often used a rear swing arm. The rear swing arm is over a in a swing arm bearing housing arranged swing arm pivotally held on a support tube. With the support tube it is for example the seat tube, i.e. the one Tube that runs up from the bottom bracket and is used to hold the seat post. Depending on the arrangement of the damper can be the support tube also act on a lower part of the seat tube, which is for arrangement the damper the rear swing arm is broken. The swing arm bearing housing is usually around a housing with a substantially cylindrical bore in which, for example a bolt or the like can be added for mounting the rocker can. The swing arm bearing housing is common by welding with the support tube connected. For this purpose, it is known to cut the support tube in order to between the support tube and the bottom bracket an intermediate part connected to the bearing housing welded, which ensures the stable connection of the support tube is deteriorated with the bottom bracket. It is also known that support tube compress into this area to locate the swing arm bearing housing to be able to. On the cross section of the support tube The swing arm bearing housing is therefore partially covered , of the support tube arranged. The compression of the support tube, however, has a considerable impact Stability disadvantage since the compression reduces the stability of the support tube and this additionally by welding with the swing arm bearing housing weakened becomes. By thus arranging the rocker bearing housing, a decrease in stability of the bicycle frame in a heavily used area.

The object of the invention is a Bicycle frames, especially a mountain bike or trekking frame to create the stability of the support tube through the arrangement of the swing arm bearing housing preferably little weakened is.

According to the invention, the object is achieved by the features of claim 1.

According to the invention, the support tube has a recess to accommodate the swing arm bearing housing. Instead of pressing the support tube together is according to the invention in the support tube a recess, for example by cutting out a part the support tube, generated. The recess preferably extends over the entire Width of the support tube.

The one above the bottom bracket shell Swing bearing housing is for attachment in the preferably open in the direction of the swing arm bearing housing Recess used and preferably by welding with the support tube connected. In particular, the support tube is at least one Part of the total cross section directly, i.e. without an intermediate part, connected to the bottom bracket. By providing a recess the stability of the support tube Avoid negative deformations. This makes it further possible, preferably both the support tube as well as connecting the down tube directly to the bottom bracket and especially the support tube directly at the same time to connect with the down tube. Through the direct connections of this force-transmitting Sharing is the weakening of stability of the bicycle frame according to the invention further reduced.

It is particularly preferred to use the bottom bracket housing, for example, via struts or the like. To connect to the swing arm bearing housing to improve stability. This makes it possible additionally to connect the bottom bracket shell to the swing arm bracket via the Support tube one create further connection between the two housings and thus the stability to increase. The bottom bracket is preferably also welded to the support tube connected.

Preferably, the bottom bracket shell with the Swing bearing housing story made, for stability reasons it is preferably a forged part is. The housing can also be used, especially for small quantities partially or completely as a milled part be made. The bottom bracket shell is included the swing arm bearing housing at least one, preferably two stiffening struts connected. The two Stiffening struts are preferably arranged in the outer region of the rocker bearing housing.

To increase the stability is preferably a arcuate welding web with the swing arm bearing housing connected. The welding bridge points in the direction of the support tube provided recess and is preferably the shape of the recess adjusted so that simple welding is possible. Here, the welding web connected to the swing arm bearing housing via webs be so that the welding web has a distance from the swing arm bearing housing. Particularly preferred it is that the weld land also with the bottom bracket shell connected is. As a result, the stability can be further improved.

The invention is explained below a preferred embodiment with reference to the accompanying drawings.

Show it:

1 a schematic side view of a bicycle frame,

2 a schematic side view of the combined pedal / swing arm bearing housing and

3 is a schematic sectional view taken along the line III-III in 2 ,

A bicycle frame ( 1 ) has a seat tube 10 into which a seat post can be inserted from above. The seat tube 10 is with a bottom bracket shell 12 and a down tube 14 directly connected. The down tube 14 is with the seat tube 10 and the bottom bracket shell 12 directly connected. Furthermore, the seat tube 10 with a top tube 16 connected. The down tube 14 and the top tube 16 are with a fork tube 18 connected. The fork tube 18 serves to hold the fork 20 as well as the steering head bearing.

The bicycle frame also has a rear swing arm 22 on that over a swing arm bearing 24 swiveling with the support or seat tube 10 connected is. There is also a damping element for vibration damping 26 provided that the one with the top tube 16 and on the other hand via a deflection element 28 with an upper swingarm tube 30 connected is.

In a preferred embodiment of the combined pedal / swing arm bearing, this is of one-story design ( 2 and 3 ). Here is the essentially cylindrical bottom bracket shell 12 with a swing arm bearing housing 32 over two stiffening struts 34 connected. The swing arm bearing housing 32 has a cylindrical bore 36 in which a bolt or the like can be inserted, with the two lower swingarm tubes 38 ( 1 ) connected is.

For connecting the combined bottom bracket / swing arm bearing housing to the support or seat tube 10 is the swing arm bearing housing 32 with a welding bridge 40 connected. The welding bridge 40 is arch-shaped, the arc in the same direction of curvature as the swing arm bearing housing 32 having. The welding web is over connecting webs 42 with the swing arm bearing housing 32 connected. Furthermore, the welding bridge 40 with the bottom bracket shell 12 connected. The connection between the welding bridge 42 and the support or seat tube 10 can thus along a relatively long weld 44 respectively. Another weld 46 there is a connection between the support tube 10 and the bottom bracket shell 12 , Another connection of the swing arm bearing housing 32 with the down tube 14 is not necessary, so that the welding effort is correspondingly low.

Claims (8)

Bicycle frames, especially mountain bike or trekking frames, with a down tube ( 14 ), one with the down tube ( 14 ) connected bottom bracket shell ( 12 ), one with the bottom bracket shell ( 12 ) connected support tube ( 10 ) and one above the bottom bracket shell ( 12 ) arranged swing arm bearing housing ( 32 ), characterized in that the support tube ( 10 ) a recess for receiving the swing arm bearing housing ( 32 ) having. Bicycle frame according to claim 1, characterized in that the recess in the direction of the swing arm bearing housing ( 32 ) is open. Bicycle frame according to claim 1 or 2, characterized in that the recess by cutting out a tube piece from the support tube ( 10 ) is manufactured. Bicycle frame according to one of claims 1-3, characterized in that the swing arm bearing housing ( 32 ) with the support tube ( 10 ) is welded. Bicycle frame according to one of claims 1-4, characterized in that the bottom bracket housing ( 12 ) with the swing arm bearing housing ( 32 ) connected, especially one-story. Bicycle frame according to claim 5, characterized in that the bottom bracket housing ( 12 ) with the swing arm bearing housing ( 32 ) via at least one stiffening strut ( 34 ) connected is. Bicycle frame according to one of claims 1-5, characterized in that the rocker bearing housing ( 32 ) with an arcuate welding web ( 40 ) connected is. Bicycle frame according to one of claims 1-7, characterized in that the support tube ( 10 ) and the down tube ( 14 ) directly with each other as well as with the bottom bracket shell ( 12 ) are connected.