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AssigneeNissan Motor Co., Ltd.
InventorsKoji Nozawa, Norio Takegami, Yukio Mizukoshi, Mitsuo Ikkatai
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A synchromesh device for a transmission of an industrial truck such as a fork lift truck includes a main shaft, forward and reverse change gears, synchronizing hub fixed to the main shaft by means of spline grooves, a coupling sleeve axially slidably engaged with spline grooves formed in the outer circumference of the synchronizing hub, and balk-rings formed in their inner surfaces with conical surfaces facing to conical surfaces formed in the side of a clutch gear integral with the forward change gear and of a clutch gear integral with the reverse change gear, respectively. According to the invention, conical angles of the conical surfaces are more than 10.degree. and preferably less than 11.degree., thereby reducing surface pressures acting between the synchronizing slide surfaces during the synchronization to improve the durability remarkably.
In a synchromesh device for a transmission of an industrial truck including conical synchronizing slide surfaces whose contact frictional force performs a synchronizing operation, the improvement comprising the conical surfaces including conical angles of more than 10.degree. but less than 11.degree..
Dependencies are inferred from the claim text.