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.
FIELD: machine engineering, possibly manufacture of sealing envelopes of corrosion resistant steels of metal-plastic high-pressure bottles.
SUBSTANCE: method comprises steps of separately making metallic convex bottoms with cylindrical collar and backing ring. Thermal expansion factor of backing ring exceeds that of bottoms; outer diameter of backing ring provides close fit of bottoms onto it at 20°C; cooling preliminarily assembled backing ring with bottoms until cryogenic temperature; sliding bottoms on backing ring in cooled state until mutual touch of cylindrical collars of bottoms; heating assembly up to 20°C in order to provide close fit of backing ring in cylindrical collars of bottoms; welding bottoms along butt of assembly and then removing backing ring by chemical milling.
EFFECT: simplified process of making envelopes with enhanced mass characteristics.
2 cl, 4 dwg, 1 ex
FIELD: machine engineering, namely equipment for dismounting press-fit joints, possibly restoration of electric machines.
SUBSTANCE: apparatus includes housing with platforms for horizontal and vertical motions. Part to be dismounted is placed on horizontal motion platform and it is fed to stripping mechanism. The last is joined with vertical motion platform by means of fastening members and it is provided with adjusted grips supporting heating members with possibility of their axial movement. Heating members are in the form of nozzles for alternating feed of hot and cooled air.
EFFECT: reduced axial errors between dismounted part and stripping mechanism, lowered efforts for stripping parts.
5 cl, 5 dwg
FIELD: machine engineering, possibly restoration of articles operating at large cyclical loads and high temperature values.
SUBSTANCE: method comprises steps of cooling male part in liquefied nitrogen and introducing it into female part. Male part is made of refractory nickel alloy similar to that of female part. After equalizing temperature of assembly, it is heated till recrystallization temperature and subjected to isothermic soaking. It causes creation of structural and phase conversions in assembled parts.
EFFECT: improved quality of joints of parts.
1 ex, 1 tbl
FIELD: mechanical engineering.
SUBSTANCE: invention can be used in shaft-bushing interference. According to invention, shaft and bushing are made of material with similar physical and mechanical properties with projections in form of laser hardened paths. Pitch of parts is twice as great as their width. Paths are arranged at angle of 0-90° to axis of joint. Opposite paths of shaft and bushing are displaced relative to each other by width of part. In particular cases, paths can be arranged along ring lines lying in planes square to axis of joint, in starting lines parallel to axis of joint, or helical lines.
EFFECT: increased load-carrying capacity of joint.
4 cl, 4 dwg
FIELD: measuring technique.
SUBSTANCE: device comprises flexible measuring member mounted concentrically with respect to the bearing race and having strain gauges covered with casing and set on its surface. The device also has split bushing with conical outer side mounted for permitting cooperation of the inner side of the flexible member with the outer side of the bearing race to be tested. The flexible member is sectional and composed of two step thick-walled races provided with strain gauges, mounted on the bushing, and interconnected by means of a thread joint. The bushing has ring cylindrical recess centered in its outer surface. The inner surfaces of the smaller steps of the thick-walled races are conical, with cone bases arranged from the side of the large steps.
EFFECT: enhanced convenience of testing and reduced metal consumption.
FIELD: plastic working of metals, namely processes for forming butt welded seams on tubes at making tube studs of U-shaped tube bundles using effect of localized hot plastic deforming of welded seam and near-seam zones.
SUBSTANCE: method comprises steps of preliminarily working tube ends by expanding them from cylinder to cylinder; assembling tubes with use of mandrel and placing intermediate member of additive material between joined end surfaces of end portions of tubes sized by expansion and end surfaces of step ring. Welded seams are formed by argon-arc welding due to melting material of intermediate member at its both sides adjacent to tube ends. The intermediate member is heated up and it is subjected to hot radial squeezing while concentrating its initial deformation in surface layers according to position of ring steps, welded seams and near-seam zones on mandrel for providing size of their outer diameter equal to initial outer diameter of tubes.
EFFECT: improved quality of welded seams.
FIELD: railway transport; repair of rolling stock.
SUBSTANCE: invention relates to repair of load-bearing parts of vehicles, particularly, to repair of overspring beams of car bogies with inserts press-fitted into step bearings. According to proposed method, step bearing of overspring beam is heated, together with insert, to temperature exceeding 250°C. Inner surfaces of insert are cooled by blowing at velocity 1.1 times higher than velocity of heat exchange through surfaces in contact with step bearing to eliminate negative allowance between insert and outer bead of step bearing. To extract insert, it is expanded from inside by applying force. Device for implementing the method has body in form of disk to be arranged in step bearing with slots on side surface in which bellcranks 9 are fitted being driven by pneumatic cylinder, with claws for gripping the insert, central hole through which rod 16 of pneumatic cylinder passes to extract insert 40, with inner space designed for distribution of cooling compressed air among nozzles pointed to surfaces of insert.
EFFECT: increased efficiency when repair overspring beams, reduced energy consumption and labor input in process of repair.
3 cl, 4 dwg
FIELD: processes and apparatuses for assembling parts at tightness, possibly production and restoration of sleeves of sealing unit of turbo-compressor.
SUBSTANCE: method comprises steps of placing sleeve into embracing part at technological tightness; performing electric-contact heating of inner surface of sleeve and then deforming it by drifting for creating mounting tightness of sleeve and embracing part joint; smoothing roughness of inner surface of sleeve. Electric-contact heating and drifting of inner surface of sleeve are realized with use of duplex tool in the form of contact- heating tool and arranged behind it deforming- calibrating tool. Contact-heating tool provides heating of inner surface of sleeve in annular zone of contact with said contact-heating tool. Deforming- calibrating tool is mounted at tightness equal to 0.8 mm. In the result during one operation sleeve is pressed-in to embracing part, roughness of inner surface of sleeve is smoothed and inner surface of sleeve is strengthened at hardness 48 - 54 HRC3.
EFFECT: enhanced efficiency of assembling parts.
FIELD: machine building.
SUBSTANCE: invention is related to machine building and instrument making, and may be used in performance of machine assembly works. Method for interference fit of parts by means of press fitting with application of material that strengthens the joint includes partial press fitting of parts with measurement of press fitting force and their further additional press fitting. According to method partial press fitting of parts is carried out. Then material that strengthens joint is applied on free sections of joined surfaces of one or both parts. After that their further additional press fitting is realised.
EFFECT: simplification of assembly process and reduction of costs for joint strengthening.
FIELD: process engineering.
SUBSTANCE: external part inner surface is furnished with 2 to 5 mm-pitch teeth. Assembly is carried out to make a clearance between external and internal parts. Internal part is subjected to upsetting.
EFFECT: higher quality and strength of joint, simplified assembly.
4 dwg, 1 ex