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|30th March 2017, 12:12||#1|
Join Date: Apr 2016
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Hero Honda Passion with parallel hub-centre steering
Thanks to Anand Singh for sending information about his creation. Heartfelt gratitude for sharing it with other enthusiasts!
It all started with a college project of an Engineering college. Anand has done his post-graduation as well and has a workshop in Allahabad where he's been modifying bikes for past 3 years. The idea was to have a radical front suspension for a motorcycle and after some research, hub-centre steering was decided. Managing to hide itself since 1910 this design has appeared in some modified bikes and mass production motorcycle too over the years. There have been attempts at making an Indian bike with the same setup over the years, one of them was on Team-BHP! (Related thread)
Anand's bike is a café racer with an unusual headlight position and has been tested for over 2,500 kilometres. The structure has withstood strongly through on road and off road conditions. The base bike used is Hero Honda Passion, 2001 model. Mileage of the bike now is around 50 km/l.
What is hub-centre steering system?
Hub-centre steering is basically an alternative to the conventional motorcycle fork system. In fork system, the steering, suspension and braking characteristics are interrelated. In hub-centre steering, all the three elements are completely independent. This completely eliminates the nose dives even during hard braking, and the suspension is unaffected.
The system essentially uses an arm or arms which are arranged in some form of a parallelogram which helps in maintaining the steering geometry. Though one of the major complains in this system is usually the steering feel. The rods and linkages tend to give a vague steering feel in accordance with the handle movement.
Currently, Bimota's Tesi 3D and the Vyrus 984C3 2V and the 985C3 4V are the only production motorcycles using hub-center steering systems, however Italjet also use hub-center steering on their top of the range scooters.
Coming to Anand's work, he has modified the front to house a parallel hub centre steering. The system has a side front mono suspension which consumes the load generated by vertical movement of the front wheel. The load on the front wheel is transmitted via a pro link mounted on the swingarm. This pro link has been pivoted on an omega plate which are generally used to reinforce the stock chassis of the bike.
The front wheel has two hubs fitted in a box position. The outer hub rotates on vertical bearings which allows the wheel to move front and back. The inner hub provides the mounting for different sets of bearing which allows the steering of the vehicle. The inner hub is connected by an A frame which also allows the steering linkage. To provide extra support a super structure has been added below to the front swing arm. Rake and trail of the bike are adjustable by pitching the threads of the quadrilateral tie rods. This is quite difficult to do on a standard fork motorcycle.
The bike has a natural anti-dive tendency so the rider is stable during extreme braking. The amount of anti-dive varies by adjusting the pro link system. The bike doesn't nose dive or lift under braking and acceleration. Turning radius of the bike though is pretty large.
Here are a few pictures of the Hero Honda Passion:
Talking about the bikes around the world who have incorporated the hub-centre steering system, there have been quite a few:
• One of the interesting ones that I came across was by the man who animated the toxic storm scene in the movie “Mad Max 4: Fury Road”. Self-taught engineer Ray Van Steenwyk's company recently patented a prototype of an air-cooled Ducati 900 SS which uses hub-centre steering system. The bike is called the Motoinno TS3. Motoinno stands for their branding company (Motorcycle Innovation) and TS3 for Triangulated Steering and Suspension System (Click here to read more).
• A heavily reworked crashed second generation Aprilia RSV 1000 R (Click here to read more).
• Jack Difazio was a bike builder living in England who specialized in hub center steering.
Bernard Mont spent 7 years creating this Ducati TT3 DIFAZIO 900 SS as a tribute to the late bike builder (Click here to read more).
|4th April 2017, 13:39||#2|
Join Date: Feb 2004
Thanked: 21,888 Times
Re: Hero Honda Passion with parallel hub-centre steering
Very cool, though wish there were more pictures of the front of the bike!
Ganesh Kakade had the following questions on our Facebook post:
1. How much weight you have added ?Also, there's one of these in India:
Vyrus in India (A Vyrus in India!)
|The following BHPian Thanks Rehaan for this useful post:|
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