The method of assembling a composite camshaft of the internal combustion engine

 

(57) Abstract:

Usage: in mechanical engineering in the manufacture of composite camshafts of internal combustion engines. The inventive joined probaly center of the outer cylindrical surface of one of them and the corresponding inner cylindrical surface of the other, after which they Orient with providing a given turn angle Cams. To connect semi-shafts use the sleeve, and on paluweh perform landing surface under the nut located eccentrically relative to the axis of the semi-shafts. Before centering semi-shafts bushing zapressovyvajut on the landing surface of one of them. The mutual orientation of semi-shafts produced by their relative rotation to align the landing surface of the second tore with the corresponding inner surface of the sleeve. Then mentioned tore pressed into the sleeve. table 1. 8 Il.

The invention relates to mechanical engineering and can be used in the manufacture of composite camshafts of internal combustion engines.

There is a method of assembling a composite camshaft is th surface of one of them and the corresponding inner surface of the other, the mutual orientation of semi-shafts, providing the specified angle spread Cams and rigid connection by means of the fastening element (1).

The disadvantage of this method is the increased labor costs for the manufacturing of precision bolts, which are used as fastening elements, and the implementation of the holes under them, which must be accurately located relative to the respective beams on paluweh.

The technical problem to be solved by the present invention is directed, is to reduce the labor required for the Assembly of the composite shaft of the internal combustion engine.

The problem is solved in that in the known method of assembling a composite camshaft of the internal combustion engine, comprising centering the joined semi-shafts on the outer cylindrical surface of one of them and the corresponding inner surface of the other, the mutual orientation of the cellars, providing the specified angle spread Cams and rigid connection by means of the fastening element, as the last used plug, and connect probaly do with landing surfaces for the sleeve, located of which, carried out to centering semi-shafts, bushing zapressovyvajut on the landing surface of one of them, the mutual orientation of semi-shafts produce before the second stage of connection by relative rotation to align the landing surface of the second tore with the corresponding inner surface of the sleeve, and the second stage of connection is carried out by pressing the above-mentioned tore into the sleeve.

The invention is illustrated graphics, where Fig.1 shows a camshaft Assembly of Fig.2 section a-a in Fig.1, in Fig.3 is a view In Fig. 1, in Fig.4,5 and 6 show the sequence of connection semi-shafts, Fig. 7 is a diagram of connection of the semi-shafts composite shaft in section, Fig.8 shows the dependence of the eccentricity of mounting surfaces on the angle of turn of Cams.

The method is as follows.

Tore 1 is installed in the prisms on the stove. Heat the sleeve 2 to a temperature of 100-140oAnd zapressovyvajut on the landing surface 3 tore 1, located eccentric to the axis of the latter (see Fig.5). Then cooled part of the tore 4, having an eccentric landing surface 5, in liquid nitrogen within 20 the spine of tore 4 and the inner cylindrical surface 7 tore 1. Turning probaly 1 and 4 around their common axis on the prisms achieve alignment of the outer Seating surface 5 tore 4 with the inner surface 8 of the sleeve 2 and are pressed tore 4 into the sleeve 2 until it stops in tore 1. To release air during the pressing surface 5 tore 4 has a chamfer 9.

Seating surfaces are made on CNC machines, which ensure their accuracy. The above method provides a simplification of the Assembly process of the composite shaft and increase the accuracy of the obtained product.

Calculation of the accuracy of the connection angle of the reversal of the camshaft lobes. Original data:

D the diameter of the inner cylindrical surface of tore 1,

d the diameter of the outer cylindrical surface 4 tore,

e the eccentricity, which made the surface 3 tore 1 and the surface 5 4 tore,

admission to the angle of rotation tore 1 relative tore 4.

It is necessary to determine the dependence of the angle of turn of the magnitude of the eccentricity e and the gap D = D - d, that is, = f(e). In Fig.5 shows the wiring diagram of the composite shaft in section. When connecting two halves of the distribution VA= 0, if the axis is at point a and at point b, =max, for clearance D. For small values of the gap D accept arc AO /2 and accept the arc AO is equal to the chord of the AO.

From the triangle of CSD should: sin/2 = OK/OD = (AO/2)/e = /4e;. .

Taking a = const, define = f(e). The calculations are summarized in table 1 and dependence = f(e) are shown in the graph of Fig.6. TTT TTT 2

The method of assembling a composite camshaft of the internal combustion engine, comprising centering the joined semi-shafts on the outer cylindrical surface of one of them and the corresponding inner cylindrical surface of the other, the mutual orientation of semi-shafts, providing the specified angle spread Cams and rigid connection by means of the fastening element, characterized in that the fixing element using the sleeve, and the connecting probaly do with landing surfaces for the sleeve, arranged eccentric relative to their axis, while the rigid connection semi-shafts are produced in two stages, the first of which is carried out before centering semi-shafts, the sleeve is pressed on the landing surface of one of them, the mutual orientation of semi-shafts produce before the second etape estoya her internal surface of the sleeve, the second stage of connection is carried out by pressing the above-mentioned tore into the sleeve.

 

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