Variable speed mechanism

Abstract

A variable speed mechanism includes at least two clutches provided on a driving shaft to allow for selectively driving, by using different ones of the clutches, transmission wheels having different gear ratios. Each of the clutches includes a clutching assembly and a ball arresting assembly that operates the clutching assembly. The ball arresting assembly includes a driving disc and a driven discopposite to each other. The driving and driven discs have surface adjacent to each other and respectively formed with two curved guide grooves extending from a deep point to a shallow point. The curved guide grooves are provided with a guide bead arranged therein so that when the driving disc rotates with respect to the driven disc, the driven disc generates a movement of leaving or approaching the driving disc so as to achieve an engagement or disengagement operation of the clutching assembly. Therefore, whether the clutches perform engagement of the clutch assembly is determined by the mechanical ball arresting assembly, a large thrust force can be generated with a small driving force, the engagement force during clutching is increased, the effect of locking the driving shaft is producedby employing different gear ratios, and unnecessary loss can be reduced.

Description

technical field [0001] The present invention belongs to the technical field of a clutch of a speed change mechanism, and specifically refers to a speed change mechanism with a mechanical action clutch, so as to improve the coupling force and reliability of the clutch, and can be deadlocked without a stage, so as to reduce unnecessary necessary wear and tear. Background technique [0002] The general speed change mechanism mainly uses the meshing relationship between the gears of different diameters between the drive shaft and the driven wheel to form different gear ratios to achieve the purpose of speed change. And the speed conversion of existing speed change mechanism mainly comes from setting at least two clutches on the drive shaft, comes to drive the driven wheel for the transmission wheel of different gear ratio of action respectively. The aforementioned clutch is composed of a clutch group and a brake group that can act as a clutch group, wherein the clutch group is ...

AI Technical Summary

Problems solved by technology

However, it needs to install an oil pressure channel in the clutch, such as forming an oil pressure hole in the rotating shaft. Not only is the structure extremely complex, but also the oil pressure has problems of compression ratio and qualitative change, resulting in unstable pressure. Under the consideration of leakage, usually high pressure is not used, so the binding force of the clutch group cannot meet the demand, and there are many faults, so it also has the problem of high cost

[0005] Whether it is the clutch of the electromagnetic valve or the hydraulic brake mentioned above, due to its limited thrust, the coupling force of the clutch is limited, so it has the problems of poor definiteness and low reliability. At the same time, the structure is complicated, resulting in manufacturing problems with assembly and also increases the cost of production

[0006] What's more, the clutches on the transmission mechanism are too complex to be modularized. Therefore, when repairing or replacing them, the parts need to be disassembled one by one, which increases the difficulty and time of repairing or replacing, especially for the internal clutches. time wasting

In addition, the drive shaft of the speed change mechanism needs to be deadlocked for safety when parking. The traditional method is to use the parking bayonet to selectively engage a tooth slot to achieve this. Poor phenomenon, so that it is easy to wear when it is stuck and pulled out. Therefore, how to solve the aforementioned problems is an urgent need for development in the industry.

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