Connection method for shaft sleeve and cylinder body of motorboat outboard engine flywheel

Abstract

The invention discloses a connection method for a shaft sleeve and a cylinder body of a motorboat outboard engine flywheel. An outer circumference surface where the shaft sleeve is matched with a cylinder body inner hole is designed to be in a stair-stepping structure and is composed of an outer layer disc, an outer edge boss and an inner layer disc in sequence. The diameter of the outer edge boss is larger than the diameter of the outer layer disc and the diameter of the inner layer disc. The outer circumstance of the outer edge boss is provided with a plurality of segments of cutting string grooves. During assembly, the outer layer disc of the shaft sleeve is placed in a small stepped hole of the cylinder body. A plurality of segments of gaps are formed on the place where the cutting string grooves of the outer edge boss correspond to a big cylinder body hole. A die is composed of an upper die and a lower die which are arranged in a matched mode. An upper die male die and a lower die male die are respectively arranged. Through an upper check block, a lower check block and a rotation stopping check block which are formed on the outer edge boss, the shaft sleeve and the cylinder body are connected into a whole. The connection method utilizes a die stamping method to firmly connect the shaft sleeve and the cylinder body into a whole. The size of the shaft sleeve is reduced significantly, material consumed by the shaft sleeve is reduced, and precious resources and processing time are saved.

Description

technical field [0001] The invention relates to a flywheel of a motorboat outboard motor (power device), in particular to a connection method between a shaft sleeve and a cylinder body of a motorboat outboard motor flywheel. Background technique [0002] The flywheel of the high-power motorboat outboard motor in the prior art is a ring-shaped structure, mainly including a cylinder body, an inner cover, a magnetic tile arranged between the cylinder body and the inner cover, and a shaft sleeve integrated with the cylinder body. The shaft sleeve is located inside the flywheel, the inner cover is usually a sheet ring made of stainless steel, and the magnetic tiles are 4 pieces, 6 pieces, 8 pieces, etc. arranged evenly along the circumference of the inner wall of the cylinder, which are consistent with the working conditions of the power unit of the outboard motor. Compatible, relying on the support and positioning of the magnetic tile holder. For high-grade and large-displaceme...

AI Technical Summary

Problems solved by technology

For high-grade and large-displacement magneto flywheel rotors, foreign countries generally adopt the integral forging of the shaft sleeve and the shell, and then use machining to process the inner and outer circles of the shell, the outer circle of the shaft sleeve and the tapered inner hole. This structure can ensure a beautiful appearance. , can output greater power generation (large internal effective space), but requires a particularly large tonnage of forging equipment, and heat treatment must be performed after forging, cracks, folding, slag inclusions, scarring, layered fractures, bright lines (bright lines) on the surface of the workpiece Defects such as area) and uneven hardness occur from time to time, resulting in a high scrap rate of workpieces; the workload of machining is heavy, and the precision of the equipment itself is also required to be high. Due to the difficulty of screening forging defects and the instability of processing, it leads to The scrap rate of the workpiece during the machining process is high, and the machining workload is particularly large. Due to the complex forging shape, a large machining allowance must be left, which wastes a lot of material and the processing cost is very high; domestically used flywheels, such as figure 1 As shown, after the cylinder body (flywheel shell) is generally stretched and formed, the shaft sleeve is combined with a large disc and the cylinder body by rivet riveting, because the taper hole of the shaft sleeve and the inner hole of the cylinder body are required to be coaxial , generally take the inner hole of the cylinder as the standard, and then taper the shaft sleeve (machined shaft sleeve taper hole). The cost of this method is much lower than that of similar foreign products, but the shape of the same power generation is larger or higher ( Because the shaft sleeve disk occupies a large space), the overall size increases, and the cylinder body and shaft sleeve consume more materials, wasting precious resources; moreover, the rivets are protruding, which is not beautiful

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