Wolfshoes
Member
A engineering feat unique to the Happy Times (HT) engine is the cohabitation of high speed gears in a dry clutch housing. Since the gears require grease or oil; some engineers creating a bike engine assembly would likely not even tried it since the grease would certainly make its way to the clutch causing it to slip. The surprise it that it works as well as it does. With the clutch and some gear reduction out of the way, a simpler path to the standard bike chain drive system is possible.
Rather than using a crossover shaft behind the motor, I am looking into going right through the bottom bracket as a sleeve or metal tube around the spindle. Since the spindle and metal tube (crossover shaft) share the same center point, there is no need for sprockets and chain from this crossover shaft (hollow tube) to the spindle on the left side (passenger side) of the bike. Just the one way free wheel clutch would be needed connecting the two in a conventional manner. The only chain needed would be from the bottom of a filed HT motor to a large sprocket assembly free spinning on the spindle (bottom bracket) below.
Standard size shafting and bronze bushings would be used in the bottom bracket with some lathe and mill work done to convert attachment points to metric as needed. To save money, I am going to convert an existing Schwinn Beach Cruiser having the larger bottom bracket. This will also retain the functionality of the coaster brake. The bike has the attachment points to be converted to multi-speed in the future; but as a single speed, I would at least recover free wheeling down hills. Installing a shift kit on a single speed bike should at least qualify me as being "sick" or at least associate "sick".
Rather than using a crossover shaft behind the motor, I am looking into going right through the bottom bracket as a sleeve or metal tube around the spindle. Since the spindle and metal tube (crossover shaft) share the same center point, there is no need for sprockets and chain from this crossover shaft (hollow tube) to the spindle on the left side (passenger side) of the bike. Just the one way free wheel clutch would be needed connecting the two in a conventional manner. The only chain needed would be from the bottom of a filed HT motor to a large sprocket assembly free spinning on the spindle (bottom bracket) below.
Standard size shafting and bronze bushings would be used in the bottom bracket with some lathe and mill work done to convert attachment points to metric as needed. To save money, I am going to convert an existing Schwinn Beach Cruiser having the larger bottom bracket. This will also retain the functionality of the coaster brake. The bike has the attachment points to be converted to multi-speed in the future; but as a single speed, I would at least recover free wheeling down hills. Installing a shift kit on a single speed bike should at least qualify me as being "sick" or at least associate "sick".