CN2816360Y

CN2816360Y - Assembled welding-type camshaft

Info

Publication number: CN2816360Y
Application number: CN 200520035148
Authority: CN
Inventors: 魏晓林; 张鸿光
Original assignee: Chengdu Xiling Automobile Fittings Co Ltd
Current assignee: Chengdu Xiling Automobile Fittings Co Ltd
Priority date: 2005-08-16
Filing date: 2005-08-16
Publication date: 2006-09-13
Anticipated expiration: 2015-08-16

Abstract

The utility model discloses an assembled welding-type camshaft, which is composed of a single cam (1) which is provided with an inner hole and a key slot, shaft journal (2) which is provided with an inner hole, and a spindle (3), wherein the spindle (3) is provided with small radial holes; the cam (1) is positioned through that a steel ball (4) which is pressed inside the small radial holes is cooperated with the key slot; after positioned, together with the shaft journal, the cam (1) is fixed to the spindle (3) in a welding mode; according to the requirements, the spindle (3) can be a solid steel shaft or a seamless steel tube. The utility model has the advantage of good performance, material saving, energy saving, man hour saving, low cost, simple structure and convenient assemblage, and can be suitable for engines of various types such as a large size engine, a medium size engine, a miniature engine, etc.

Description

Assembling welding type camshaft

Affiliated technical field

The utility model relates to a kind of camshaft, particularly a kind of assembling welding type camshaft.

Background technique

Present employed camshaft all is monolithic construction basically, and the manufacturing process of this one-piece camshaft mainly contains three types: the one, with the direct machining of round steel bar; The 2nd, forge (or transverse rolling); The 3rd, casting.Forge (or transverse rolling) explained hereafter camshaft not only waste material and the energy with direct machining of round steel bar and employing, and expend machining man-hour and corresponding auxiliary material; Can save a part of raw material though produce camshaft, but still will consume a large amount of energy, environment is also had certain pollution with casting technique.The axle center oilhole of this one-piece camshaft all needs row processing more in addition, generally adopts the drilling method, and not only difficulty of processing is big, and drilling time is long, is difficult to take out in the hole in case drill bit breaks, and often causes product rejection.Can find out from last analysis,, therefore adopt which kind of production technology cost of production all higher because camshaft is a monolithic construction at present.

Notification number be CN2422449Y patent disclosure a kind of combined type hollow camshaft, this camshaft is to form with high strength compound roasting knot agent bonding after cam, axle journal are made single assembly parts, though this camshaft can reduce consumption, reduce cost, but, therefore can only be used for the single-cylinder engine motor because it can't guarantee the accurate location of cam on mandrel.

Summary of the invention

The purpose of this utility model is to provide a kind of assembling welding type camshaft that is applicable to various motors, and this camshaft not only performance is good, and cost of production is low.

For achieving the above object, the solution that the utility model adopts is: this camshaft is made up of the cam that is processed into the single-piece form in advance, axle journal and mandrel, cam and axle journal are processed with the endoporus with the mandrel transition fit, also have keyway on the cam, be processed with the radial hole that equates with the cam number on the mandrel, radial hole is consistent at the phase angle that distribution on the mandrel and cam distribute on mandrel, the steel ball that plays the role of positioning is pressed in the radial hole and cooperates with keyway on the cam, be fixed by welding on the mandrel with axle journal after the cam orientation, mandrel is solid steel axle or steel pipe.

The utility model is owing to make the monolithic shape with cam and axle journal by finish forge or precision casting technology in advance, only leave a little machining allowance on it, but so the utility model economical with materials, energy saving and saving machining period, the most outstanding is economical with materials, with YC4102 four-cylinder diesel engine camshaft is example, one-piece camshaft needs with 12 kilograms of materials as adopting the processing of round steel bar, and assembling welding type camshaft only needs 6.5 kilograms of materials, but economical with materials about 45%; Mandrel of the present utility model in addition can be a solid steel axle, it also can be seamless steel pipe, when camshaft has the axle center oilhole, can adopt steel pipe as mandrel, steel tube inner hole is just as the axle center oilhole of camshaft, thereby need not to reprocess the oil circuit hole, therefore not only can save machining period, energy saving, but also can save drill bit and relevant device, and can thoroughly avoid the product rejection that breaks and in the hole, cause because of drill bit.Except that above-mentioned advantage, the utility model also has advantages such as performance is good, simple in structure, easy to assembly, and the utility model can be applicable to the motor of various models.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Description of drawings

Fig. 1 is an embodiment's of the utility model a structure diagram.

Fig. 2 is the sectional drawing (one section camshaft has only drawn among the figure) of camshaft shown in Figure 1.

Fig. 3 is the A-A sectional drawing of Fig. 1.

Fig. 4 is the B-B sectional drawing of Fig. 1.

Fig. 5 is another embodiment's of the utility model a sectional drawing.

Drawing sequence number explanation: cam 1, axle journal 2, mandrel 3, steel ball 4, weld seam 5.

Embodiment

Embodiment 1

Fig. 1 is the structure diagram of four-cylinder camshaft, and Fig. 2 is its sectional drawing, and Fig. 3, Fig. 4 are its sectional view at cam, axle journal place.Among the figure, cam 1 is the monolithic cam, its profile adopts finish forge or smart casting to form, and the monolithic cam 1 after finish forge or the smart casting leaves a little machining allowance, and its endoporus and keyway machine before assembling, bearing journal 2 also is processed into the single-piece form in advance, it only needs the processing endoporus, need not process keyway, and monolithic cam 1 is a transition fit with the endoporus and the mandrel 3 of single-piece axle journal 2, there is the angle at the two ends of their endoporus, are used for welding.Mandrel 3 is the solid steel axle, be drilled with the radial hole that equates with cam 1 number on it, the degree of depth of radial hole is less than 2 millimeters, it is consistent with the phase angle that monolithic cam 1 distributes on mandrel 3 in the distribution on the mandrel 3, as present embodiment is YC4102 four-cylinder camshaft, on it, have 8 cams, wherein the angle between the first cylinder intake cam and the exhaust cam is 107 °, angle between 4 intake cams of four cylinders is 90 °, angle between 4 exhaust cams also is 90 °, just need get out 8 radial holes so on the mandrel 3, radial hole is consistent with the phase angle that above-mentioned cam 1 distributes on mandrel 3 in the distribution on the mandrel 3.Owing to have relatively high expectations in the phase angle of cam 1, therefore the angular positioning of cam 1 on mandrel 3 is very important, it is accurate more to locate, machining allowance is just few more, otherwise, phase angle location is inaccurate, and machining allowance is just bigger, even occurs that the limit that cam arrived tolerance is still ground circle and the phenomenon that causes product rejection.The measure of the utility model for guaranteeing that the accurate location of cam 1 on mandrel 3 taked: one is to use the dedicated numerical control drilling machine of design voluntarily to get out radial hole, guaranteeing the phase angle tolerance of radial hole, the 2nd, adopt to be pressed into steel ball 4 in the radial hole and steel ball 4 is cooperated with keyway on the cam 1 cam 1 is located.Concrete assembly process is after the radial hole on the mandrel 3 machines; 8 steel balls 4 are pressed into respectively in 8 radial holes; again cam 1 and axle journal 2 are assemblied on the mandrel 3 in order; should guarantee that the keyway on the cam 1 cooperates with steel ball 4; at last the axle that assembles is placed on the special purpose machine tool and welds; adopt CO 2 gas-shieldedly during welding, weld seam 5 is positioned at two chamfer places of cam and axle journal endoporus, can make whole camshaft profile more attractive in appearance like this.

Embodiment 2

The structure of camshaft shown in the present embodiment as shown in Figure 5, as different from Example 1, mandrel 3 is a seamless steel pipe in the present embodiment, and steel tube inner hole is exactly the axle center oilhole of camshaft, just adopt this structure for the camshaft that requires the axle center oilhole, can save this procedure of processing oil circuit hole.

Claims

1. an assembling welding type camshaft comprises cam (1), axle journal (2) and mandrel (3), it is characterized in that:

A. cam (1) and axle journal (2) are processed with the endoporus that cooperates with mandrel (3), cam also is processed with keyway on (1), be processed with the radial hole that equates with cam (1) number on the mandrel (3), it is consistent that the distribution of radial hole on mandrel (3) and cam (1) are gone up the phase angle that distributes at mandrel (3), and the steel ball that plays the role of positioning (4) is pressed in the radial hole and cooperates with keyway on the cam (1);

B. cam (1) and axle journal (2) are fixed by welding on the mandrel (3);

C. mandrel (3) is solid steel axle or steel pipe.