SU905542A1 - Crank shaft - Google Patents

Description

one

The invention relates to mechanical engineering, and more specifically to the structures of the crank mechanism of internal combustion engines.

A crankshaft is known comprising five elbows, four of which are equidistant in pairs from the central one with coinciding directions and planes of equidistant elbows. This shaft is balanced by the forces of inertia of the 2nd order, the moments of the central force and the moments of the inertia of the 1st and 2nd order

The disadvantage of this design is that when it is used on engines with the angle of collapse of the cylinder block equal to 90, it is necessary to set counterweights with a mass of 3.2 kg to balance centrifugal centrifugal forces and 1st order inertia forces. This reduces the natural frequency of oscillation of the shaft and shifts it to the area of operating frequencies.

engine, which violates the dynamic balancing of the latter.

The purpose of the invention is to improve the dynamic balancing and reduce the mass of the engine balances with a camber angle of 90.

This goal is achieved due to the fact that the angle between the planes of the knees on the shaft, which are differently distant from the central one, is 0.82 + 0.04 from the angle between each of the planes of the knees and the plane of the central knee.

With this crankshaft design, the weight of the counterweights installed for balancing on each of its cheeks is 1.4 kg.

FIG. Figure 1 shows the layout of the knees, a view from the end portion, as well as vectors of inertial forces of the 1st order, which coincide with the direction of the knee in FIG. 2 shows the arrangement of vectors of inertial forces of the 2nd order in FIG. 3 shows a shaft embodiment (circuit) with counterweights for balancing centrifugal forces and inertia forces of the 1st order.

The crankshaft contains five knees, 1-5, with knee 3 central, extreme knees 1 and 5 equidistant from the central one are located in the same plane, and equally oriented knees 2 and 4 are equally equidistant from the central one equally directed, the angle between the planes the pair of knees is 0.82iO, OA angle between the planes of the pair of knees and the central knee 3.,

The mass of counterweights 6 and 7 is reduced by 2.3 times compared with the mass of counterweights of the known shaft. Such a shaft is simple to manufacture and dynamically balanced.

Invention Formula The pricked shaft of an internal combustion engine contains five knees, four of which are equidistant in pairs from the central one with coinciding directions and planes of equidistant knees, in order to improve the dynamic balance

The angle between the planes of the knees, which are variously distant from the central one, is 0.82 ± p, 04 of the angle between each of the planes of the knees and the plane of the central knee.

Sources of information taken into account in the examination

1. USSR author's certificate in application number 2187374/27, cl. F 16 F 15/24, 1975.

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Claims (1)

Claim The crankshaft of the engine of internal combustion, containing five elbows, four of which are equally spaced from the central pair with the same directions and planes of equidistant elbows, characterized in that, in order to improve the dynamic balancing and reduce the weight of the engine counterweights with the angle of the camber of the blocks cylinders equal to 90, the angle between the planes of the knees, differently distant from the central, is 15 0.82 + 0.04 from the angle between each of the planes of the knees and the plane of the central knee.