Difference between revisions of "The New Bike"
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=General= | =General= | ||
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[[File:Bike_dimensions.png|200px|thumb|right|General Dimensions]] | [[File:Bike_dimensions.png|200px|thumb|right|General Dimensions]] | ||
[[File:Frame.jpg|200px|thumb|left|The Frame of the New Bicycle]] | [[File:Frame.jpg|200px|thumb|left|The Frame of the New Bicycle]] | ||
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The wheels are 27 inches in diameter. The planned tires will be 27 inch road bike tires. General dimensions for the bike can found in the image to the right. | The wheels are 27 inches in diameter. The planned tires will be 27 inch road bike tires. General dimensions for the bike can found in the image to the right. | ||
| + | ===Frame=== | ||
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| + | ===Wheels=== | ||
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==Design Overview== | ==Design Overview== | ||
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| + | The main objectives for the new bicycle was to prevent the need for welding and other permanent structures compared with the [[Old Bike]]. To do this, we've adopted a modular design approach with all the added components of the bicycle to allow for re-design opportunities of different parts and fixtures present on the bike. This approach will extend the usefulness of the platform for years to come. | ||
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The final design for the bike can essentially be split up into two major regions: the Brain and Body. This split is defined by the connection between different components. The “Brain” sits around the diamond of the bike frame while the “Body” is situated around and extending outward from the head tube. This distinction, though somewhat ironic considering the relative locations of the regions, is useful because it lends itself to let us think and design more locally. | The final design for the bike can essentially be split up into two major regions: the Brain and Body. This split is defined by the connection between different components. The “Brain” sits around the diamond of the bike frame while the “Body” is situated around and extending outward from the head tube. This distinction, though somewhat ironic considering the relative locations of the regions, is useful because it lends itself to let us think and design more locally. | ||
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==Mechanical Components== | ==Mechanical Components== | ||
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===Top Frame Joint=== | ===Top Frame Joint=== | ||
Revision as of 18:38, 5 December 2021
This is the next platform of the Cornell Autonomous Bicycle Team. It is intended to be a more stable, reliable, and versatile platform than The Old Bike. The bike is still largely in the design phase, so wiki sections are limited to the current state of the bike.
Contents
General
Bike Details
The frame is a ***cm KTM Trento with serial number ******.
The wheels are 27 inches in diameter. The planned tires will be 27 inch road bike tires. General dimensions for the bike can found in the image to the right.
Frame
Wheels
Design Overview
The main objectives for the new bicycle was to prevent the need for welding and other permanent structures compared with the Old Bike. To do this, we've adopted a modular design approach with all the added components of the bicycle to allow for re-design opportunities of different parts and fixtures present on the bike. This approach will extend the usefulness of the platform for years to come.
The final design for the bike can essentially be split up into two major regions: the Brain and Body. This split is defined by the connection between different components. The “Brain” sits around the diamond of the bike frame while the “Body” is situated around and extending outward from the head tube. This distinction, though somewhat ironic considering the relative locations of the regions, is useful because it lends itself to let us think and design more locally.
Brain
The “Brain” is defined by its contents: the electronics. It is composed of 4 clamp-like components, 2 sheets of acrylic, and 2 panels for the electronics to sit. The clamp-like components connect to the edges of the bike diamond in order to give the acrylic sheets points to connect to in order to enclose the frame. The electronics, once situated onto their corresponding panels, will be attached with velcro to the acrylic sheets.
Body
Similar to the brain, the “body” is defined by its function, in this case the handling of actuation and vision on the bike. The body is composed of 2 main intertwining assemblies. One centered around the motor and the other around the camera. The motor will be attached to the stem of the bicycle with the use of a custom shaft collar.
Mechanical Components
Top Frame Joint
As stated in the intro, the frame joint acts to suspend the clear panes that will encase the electronics in the center of the bike. The top frame joint specifically is made for the rounded surface at the top of the bike. It is made up of 4 major components: a machined piece of aluminum or other light metal, a piece of rubber that sits between the bike and the machined component, two hex head screws, and two nuts to match.
Near the bottom edge of the aluminum there are four threaded holes (two on either side) that indicate where the aluminum will attach to the clear panes. The rubber sits directly on top of the curved edge of the aluminum. It is meant to provide grip strength so that the component does not slip out of place. There are two 9/16" holes on top that propagate through the entire design and the bike frame itself that make space for the bolts and nuts to compress all the components to the bike frame. We plan to have between 2-3 top frame joints will line the top tube.
Bottom Frame Joint
The bottom frame joint has an identical function as the top frame joint. However, the bottom frame joint's geometry differs from it because the cross section of the bottom tube is elliptical. This presented a unique design challenge that we had to work around. We ended up on settling on an idea that combines 4 different parts together: 2 flat plates, a hemispherical piece, and rubber.
In order to match the elliptical shape of the bottom tube these parts are screwed together as seen in the image. There exist larger holes on the surface of the hemispherical piece to make room for screw heads, and there exist threaded holes that cut through half of the flat pieces. Near the top edge of the flat plates there are threaded screw holes for attachment to the clear planes. The rubber again acts as a way to grip the components to the frame and prevent slip. Just like the top frame joint, there are two 9/16" holes made in both the frame, rubber, and hemispherical piece to make room for the bolts and nuts to compress the system to the bike frame. 2 Bottom frame joints will be used to hold the clear plane.
