摘要:
A bicycle assembly can include a bicycle frame that can have a head tube, a top tube and a down tube. The top tube and down tube can be attached to the head tube. The head tube can include at least one ledge configured to fit inside either of the top and down tubes. The top of the top tube and/or the bottom of the down tube can be substantially flush with the top of the head tube or bottom of the head tube, respectively.
摘要:
An assembly for fitting together multiple exhaust pipes in a multi-cylinder engine into a single unit is provided. The assembly includes a cap and a choke pipe connected to the cap. The cap includes a surface with multiple sockets protruding from the surface in a direction opposite to the choke pipe whereby the sockets engage the exhaust pipes. The cap also includes a skirt, which surrounds a perimeter of the surface. The skirt extends from the surface in a direction toward the choke pipe. An internal surface of the sockets, an internal surface of the skirt and an internal surface of the choke pipe are linearly arranged with respect to each other.
摘要:
The invention relates to a method and apparatus for the production of double-walled hollow sections by means of internal high-pressure forming, a first hollow section being inserted into a second hollow section, after which the double-walled hollow section thus formed is subjected to high internal fluid pressure in such a way in an internal high-pressure forming die that the double-walled hollow section is expanded. During this process, an air gap is formed between the first, inner, hollow section and the second, outer, hollow section. In order to produce double-walled hollow sections with an air gap between the inner and the outer hollow section in a simple manner and with a reduced process time, the proposal is to position the inner hollow section in a defined manner in the outer hollow section during insertion, forming a gap, to introduce an intermediate layer between the inner hollow section and the outer hollow section, filling the gap, and, after expansion of the double-walled hollow section by internal high-pressure forming, to dissolve the intermediate layer out of the hollow section via an opening formed at least in one of the hollow sections, opening up the gap as an air gap.