CN201103484Y

CN201103484Y - Motorcycle engine gas cylinder end cover

Info

Publication number: CN201103484Y
Application number: CNU2007201250531U
Authority: CN
Inventors: 岳雄
Original assignee: Lifan Industry Group Co Ltd
Current assignee: Lifan Technology Group Co Ltd
Priority date: 2007-08-27
Filing date: 2007-08-27
Publication date: 2008-08-20
Anticipated expiration: 2017-08-27

Abstract

The utility model relates to a cylinder cover of the motor of a motorbike, which comprises a cylinder cover body (1); the upper end of the cylinder cover body is closed and the lower end is open; the upper closed end is an arc surface and the lower open end is a plane surface; a bracket (1 f) is arranged on the external edge of the lower end of the cylinder cover body (1); an installation hole (1 g) is arranged on the bracket (1 f); the weight of the cylinder cover body (1) is 900 to 1,100g; the wall thickness of the top surface of the cylinder cover body (1) is less than or equal to the wall thickness of the side surface and the wall thickness of the top surface of the cylinder cover body (1) is 7 to 10mm. The utility model changes the structure of the cylinder cover from three aspects of material, weight and wall thickness, thus being capable of effectively reducing and the noise of the cylinder cover simultaneously when greatly reducing the manufacture cost of the cylinder cover. The cylinder cover solves the technical problem existing in the motorbike industry and is characterized by novel design, easy operation and low cost so that the cylinder cover can be popularized and used in a large scale.

Description

Motorcycle engine cylinder skull

Technical field

The utility model relates to the parts on a kind of motorcycle engine, relates in particular to motorcycle engine cylinder skull.

Background technique

At present, motorcycle engine internal motion spare can cause the cylinder head vibration in the running as connecting rod and piston, produces bigger noise, and passes out by the cylinder skull.The cylinder head noise that how to reduce motor is the difficult problem that whole motorcycle industry is all making great efforts to overcome always.

Can find that the cylinder head that a finger is placed on motor covers in the cylinder head noise of analyzing motor, the cylinder head noise of motor has diminished a lot, takes away finger, and it is big that noise becomes again at once.This is to put the weight that has increased the cylinder skull because of finger, has changed the vibration frequency of cylinder head, has reduced the cylinder head vibration, thereby has reduced the noise of engine interior movement parts.When the cylinder skull of motor being wrapped, can find that the cylinder head noise of motor becomes very little, some noise even disappeared with towel.This is because towel has increased the thickness of cylinder skull, has produced the effect of shielding, and partly noise shielding is at engine interior.

General cylinder skull is to pass through die cast by aluminum alloy now, the upper end closed of cylinder skull, and the lower end is uncovered, the wall thickness minimum of its end face, between 3-4mm, the weight of entire cylinder skull is greatly about about 400g.Because weight wall thickness light, end face is less, so the cylinder head noise of motor mainly transmits out by the cylinder head hd top face; The material aluminium alloy of cylinder skull, itself does not have sound absorption aluminum alloy, is that noise passes through one of reason that the cylinder skull transmits yet.In addition, the price of aluminum alloy material itself and extrusion process can cause the cost up of cylinder skull all than higher.

The model utility content

Technical problem to be solved in the utility model is to provide a kind of motorcycle engine cylinder skull that can effectively reduce the cylinder head noise.

The technical solution of the utility model is as follows: a kind of motorcycle engine cylinder skull, comprise cylinder skull body, the upper end closed of this cylinder skull body, the lower end is uncovered, closed end is a cambered surface on it, lower open mouth end is the plane, outer edge in cylinder skull body lower end is provided with journal stirrup, offer mounting hole on this journal stirrup, its key is: the weight of described cylinder skull body is 900-1100g, the wall thickness of cylinder skull body end face is less than or equal to the wall thickness of side, and the wall thickness of cylinder skull body end face is 7-10mm.

Adopt above technological scheme, the weight of cylinder skull body is increased to 900-1100g about by original 400g, by increasing the weight of cylinder skull, changed the vibration frequency of engine cylinder head, reduce the vibration of engine cylinder head, and can play the effect that reduces engine interior movement parts running noise.The weight of cylinder skull body is advisable with 900-1100g, and less than 900g, then the weight of cylinder skull body is too light, changes the DeGrain of engine cylinder head vibration frequency; Greater than 1100g, then the weight of cylinder skull body is too heavy, makes power-weight ratio reduce, and has not both met existing engine weight and has wanted light, power to want big development trend, can cause waste of material again, and increase cost of production.

The wall thickness of cylinder skull body end face is increased to 7-10mm by original 3-4mm, by increasing the wall thickness of cylinder skull body end face, can produce shield effectiveness preferably, the partial noise shielding at engine interior, also can be played the effect that reduces the engine cylinder head noise.The wall thickness of cylinder skull body end face is advisable with 7-10mm, and less than 7mm, then thickness is too thin, and shield effectiveness is not obvious; Greater than 10mm, then thickness is too thick, has both caused cylinder skull profile to increase easily, influence attractive in appearancely, causes unnecessary waste of material again easily, makes the cost of production increase.

Above-mentioned cylinder skull body is the ironcasting by cast molding, the material of cylinder skull body changes cast iron into by original aluminum alloy, the price of cast iron itself and casting technology is all much lower than aluminium alloy structure, greatly reduces the manufacture cost of cylinder skull like this; The density of cast iron own is big, has sound-absorbing effect preferably, also can play the effect that reduces the engine cylinder head noise.

The end face of above-mentioned cylinder skull body is provided with stiffening rib, and stiffening rib works to increase cylinder skull intensity on the one hand, makes that on the other hand the moulding of cylinder skull is more attractive in appearance.

Beneficial effect: the utility model sets about changing the structure of cylinder skull from three aspects such as material, weight and wall thickness, when reducing cylinder skull cost of production greatly, can effectively reduce the cylinder head noise of motor, solved the long-standing technical barrier of whole motorcycle industry, have modern design, implement easy, lower-price characteristic, be suitable for large-scale promotion and use.

Description of drawings

Fig. 1 is a worm's eye view of the present utility model.

Fig. 2 also is embodiment 1,2,3 a structural representation for the D-D of Fig. 1 analyses and observe rotation diagram.

Fig. 3 is the utility model embodiment 4,5,6 a structural representation.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples:

Embodiment 1, as shown in Figure 1 and Figure 2, cylinder skull body 1 upper end closed in the utility model, the lower end is uncovered, and by the cast iron casting moulding, weight is 900g.The end face of cylinder skull body 1 is a cambered surface, and the wall thickness of end face is less than the wall thickness of side, and the wall thickness of cylinder skull body 1 end face is 7mm; Be formed with many stiffening rib 1a on the end face of cylinder skull body 1, this stiffening rib 1a works to increase cylinder skull intensity on the one hand, makes that on the other hand the moulding of cylinder skull is more attractive in appearance.

As can be known, the bottom surface of cylinder skull body 1 is the plane from Fig. 1, Fig. 2, and the bottom surface of cylinder skull body 1 is provided with oilhole 1b, and the oil duct 1c that distributes on this oilhole 1b and cylinder skull body 1 inwall communicates; Profile at the upper edge, bottom surface of cylinder skull body 1 cylinder skull body 1 inner chamber offers seal groove 1d, so that place corresponding Sealing, prevents lubricating oil leakage.The shape of cylinder skull body 1 inner chamber is same as the prior art, does not give unnecessary details at this.The outer wall of described cylinder skull body 1 bottom extends laterally, forms a circle boss 1e, is formed with a plurality of journal stirrup 1f at the outer edge of this boss 1e, offers mounting hole 1g on this journal stirrup 1f.During installation, the open-mouth end of cylinder skull body 1 is fastened on the junction plane of engine cylinder head, oilhole 1b on the cylinder skull body 1 docks with corresponding oil duct on the cylinder head, on each journal stirrup 1f on the cylinder skull body 1 and the cylinder head fit in corresponding installation position, by screw cylinder skull body 1 and cylinder head is fixed together.

Embodiment 2, and as shown in Figure 1 and Figure 2, the weight of cylinder skull body 1 is 1000g in the present embodiment, and the wall thickness of cylinder skull body 1 end face is 8.5mm.All the other structures of present embodiment are identical with embodiment 1.

Embodiment 3, as shown in Figure 1 and Figure 2.The weight of cylinder skull body 1 is 1100g in the present embodiment, and the wall thickness of cylinder skull body 1 end face is 10mm.All the other structures of present embodiment are identical with embodiment 1.

Embodiment 4, and as Fig. 1, shown in Figure 3, the weight of cylinder skull body 1 is 900g in the present embodiment, and the wall thickness of cylinder skull body 1 end face equals the wall thickness of side, and the wall thickness of cylinder skull body 1 end face is 7mm.All the other structures of present embodiment are identical with embodiment 1.

Embodiment 5, and as Fig. 1, shown in Figure 3, the weight of cylinder skull body 1 is 1000g in the present embodiment, and the wall thickness of cylinder skull body 1 end face is 8.5mm.All the other structures of present embodiment are identical with embodiment 4.

Embodiment 6, and as Fig. 1, shown in Figure 3, the weight of cylinder skull body 1 is 1100g in the present embodiment, and the wall thickness of cylinder skull body 1 end face is 10mm.All the other structures of present embodiment are identical with embodiment 4.

Only as further specifying of the present utility model, protection domain of the present utility model is not subjected to embodiment's restriction to above embodiment.

Claims

1, a kind of motorcycle engine cylinder skull, comprise cylinder skull body (1), the upper end closed of this cylinder skull body (1), the lower end is uncovered, closed end is a cambered surface on it, lower open mouth end is the plane, outer edge in cylinder skull body (1) lower end is provided with journal stirrup (1f), offer mounting hole (1g) on this journal stirrup (1f), it is characterized in that: the weight of described cylinder skull body (1) is 900-1100g, the wall thickness of cylinder skull body (1) end face is less than or equal to the wall thickness of side, and the wall thickness of cylinder skull body (1) end face is 7-10mm.

2, motorcycle engine cylinder skull according to claim 1 is characterized in that: described cylinder skull body (1) is the ironcasting by cast molding.

3, motorcycle engine cylinder skull according to claim 1 and 2, it is characterized in that: the end face of described cylinder skull body (1) is provided with stiffening rib (1a).