CN2623888Y - Natural wind cooling cylinder head of sealed camshaft soleplate - Google Patents

Abstract

The utility model relates to a natural air cooling cylinder head which is used for sealing a camshaft base. The utility model comprises a cylinder head body and a camshaft base which is arranged on the cylinder head body. The camshaft base is provided with a rocker arm shaft hole horizontally and a hole plug vertically connected with a joint hole which is arranged on the cylinder head; at least an intersecting hole plug intersects with the rocker arm shaft hole, and a cooling air path is arranged in the cylinder head body; the inlet hose of the cooling air path is arranged on the windward surface of the cylinder head; the outlet hose of the cooling air path is arranged on the other surfaces of the cylinder head; a column body is arranged coaxially at the crossing of the inner intersecting hole plug and the arm shaft hole, and the column body is used for isolate the lubricant poor inside the engine from the outside. The utility model eliminates the heating energy generated by the engine through the cooling air path arranged in the cylinder head of the engine, and simultaneously seals the arm shaft hole by arranging a column body in the plug hole, making the lubricating oil of the engine not to leak out.

Description

The natural air cooled cylinder head of sealed cam axle fitting seat

Technical field

The utility model relates to a kind of natural air cooled steam cylinder head device, particularly a kind of motorcycle engine cylinder head that has the camshaft fitting seat of sealing and offer the natural cooling air channel, this cylinder head is guaranteed the cooling of motor efficiently radiates heat and the lubricant oil phenomenon that leaks is not taken place, belongs to motorcycle engine manufacturing technology field on the basis to camshaft fitting seat sealing.

Background technique

Motorcycle engine can produce a lot of heats usually when work, the temperature of this motor is raise.

Because too high temperature not only can make efficiency of engine reduce greatly, and the damage that causes motor easily and be connected other parts on this motor, so, in the design of motorcycle engine, making, often need to make motor to have thermal diffusivity preferably, the Temperature numerical of motorcycle engine in the work is controlled in the allowed band.

The radiating mode major part of traditional motorcycle engine is a nature air swept type, promptly, the some radiating fin of outer installment at the cylinder head of motor, because radiating fin and cylinder head adopt aluminum alloy integrally manufactured, when motorcycle under steam, fin surface is crossed in the wind of flowing fast, and heat is taken away, and reaches the heat radiation cooling of motor with this.

For big air displacement nature air swept type motor, only rely on radiating fin that motor is cooled off, often not enough, because the heat that big air displacement motor produces can be higher with respect to float tolerance motor, so this type of cooling exists certain deficiency, also occurring many motors thus, to exist the cylinder head heat load too high, influence motor power performance and cylinder head in the component reliability of operation.

If adopt the quantity that increases radiating fin to increase the mode of the surface area of radiating fin in other words, can be subjected to the restriction of motor boundary dimension again, therefore, do not increasing or increasing on a small quantity under the prerequisite of radiating fin area, the efficiently radiates heat problem of the big air displacement motorcycle engine of scientific and rational solution is to increase this engine power performance and increase one of its functional reliability institute urgency problem to be solved.

At present, the mode that addresses this problem in the industry is to adopt to offer cooling airway.(application number is: 97222328.2), disclose a kind of heat dissipation technology scheme of motorcycle engine, as shown in Figure 1 at Chinese patent " sink of ventilation type OHV engine cylinder head " by name.This technological scheme is to offer a cooling airway between suction port 23 in engine cylinder head 20 and the relief opening 22, and folding a gas collection portion 10 to the cylinder head excurvation at this cooling airway one end, the free end of this gas collection portion 10 then forms a gas collection mouth 11 that is communicated with cooling airway.

When motorcycle when driving, the cool air that brushes to motorcycle is directly poured in the gas collection portion 10 by the gas collection mouth 11 of cylinder head 20, and be guided into by gas collection portion 10 in the cooling airway of engine cylinder head 20 inside, prevent the damage that causes the engine valve because of overheated with this.

Though technique scheme has certain help to the heat dissipation problem that solves motorcycle engine, radiating effect is still not good enough, and exists certain deficiency.

As can be seen from Figure 1, cooling airway, gas collection portion 10 connect into the passage of cooling air, in this passage, have only the cooling airway part to carry out effective heat exchange with cylinder head 20, and the major function of gas collection portion 10 is to compile cool air.Because three faces that constitute this gas collection portion 10 all are in the outside of cylinder head 20, directly do not fit with this cylinder head 20, so the heat exchanging function of this gas collection portion 10 are extremely limited.So in this technological scheme, cooling airway has been born most heat exchange functions, but because cooling airway is shorter, cool air is relative less with the heat exchange area of cylinder head 20, so this technological scheme exists the deficiency less relatively to the engine radiating cooling effect.

In addition, known to usually, under the suitable prerequisite of the identical and every performance of air displacement, the volume size smaller of motor be good as people, and motorcycle engine particularly is to the just strictness more of requirement of its volume size.In above-mentioned " sink of ventilation type OHV engine cylinder head " technological scheme, owing to increased gas collection portion 10, the size of cylinder head is increased to some extent on original basis in the outside of cylinder head 20, this is another deficiency of this technological scheme.

At present, the mode that solves above-mentioned heat dissipation problem and do not increase the engine cylinder area of bed is: adopt cooling duct is set in engine cylinder head, and the intake grill of this cooling duct directly is opened on the surface of cylinder head body, be specially, be opened in the next door of relief opening, make the gas collection portion that cooling duct compiles cool air by the cylinder head body, can increase heat exchange area like this, improve heat radiation function.But because the restriction of structure, the setting of cooling duct can bring the problem that lubricant oil leaks in the motor again.

As shown in Figure 2; the cooling duct 21 that is provided with can connect (in the actual production of motor with (or several) keyhole 6 in the cylinder head 10 usually; because its internal structure complexity; so generally; this motor is divided into some component processing; and a plurality of keyholes are offered in distribution; the keyhole of corresponding position on all parts is interconnected; after component processing finishes, by keyhole parts are connected, be assembled into entire engine with bolt; keyhole is also referred to as the AB keyhole in some manufacturing enterprises); among the figure, be equipped with bolt 8 in the keyhole 6, camshaft fitting seat 7 is connected with cylinder head 10.Because keyhole 6 is being communicated with camshaft fitting seat 7 on the motor, and the physical dimension of camshaft fitting seat 7 is less usually, thus keyhole 6 easily with camshaft fitting seat 7 on rocker shaft hole 71 crossing.Offer the groove or the hole of stepping down on the pitman arm shaft 72 to keyhole 6, this groove or hole just with pitman arm shaft 72 in bolt hole 721 connect, caused keyhole 6 and bolt hole 721 to connect, and then caused bolt hole 721 and cooling duct 21 perforations.

Because bolt hole 721 directly is communicated with the oil sump of motor, and motor is when work, the pressure of its inner oil sump is bigger, has formed the negative pressure between outside, the inside, so lubricant oil will be by the path that is made of bolt hole 721, keyhole 6 and cooling duct 21 to external leakage.In addition, the lubricant oil in the oil sump also flows to keyhole 6 through the gap of rocker shaft hole 71 and pitman arm shaft 72.Therefore, have only to have solved the lubricant oil phenomenon that leaks, could effectively solve the heat dissipation problem of motorcycle engine.

The model utility content

Main purpose of the present utility model is at above-mentioned motorcycle engine, the natural air cooled motor of particularly big air displacement existing deficiency in the radiating and cooling design provides a kind of engine cylinder head with cooling duct, this cylinder head is by its inner cooling duct that is provided with, the heat that motor produces when working is got rid of rapidly, and effectively the operating temperature of motor is controlled in the preferable scope down the collaborative of radiating fin, thereby make this motor can bring into play desirable power performance, increased the reliability of motor.

Another purpose of the present utility model is the problem that leaks at above-mentioned lubricant oil, provide a kind of interior machine oil of oil sump that prevents from the gap between pitman arm shaft and the camshaft fitting seat and by the camshaft fitting seat of bolt hole to the sealing rocker shaft hole of external leakage, this camshaft fitting seat is with the partition that is communicated with between rocker shaft hole and the keyhole, play the seal action to rocker shaft hole, the mode that engine cylinder head can be adopted cooling duct is set is carried out effective radiating and cooling to this motor.

The utility model is achieved through the following technical solutions:

This technological scheme is a kind of natural air cooled cylinder head of sealed cam axle fitting seat, which comprises at least the cylinder head body and be arranged on camshaft fitting seat on the cylinder head body, level offers rocker shaft hole on this camshaft fitting seat, also vertically offers the keyhole that is communicated with set attachment hole in the cylinder head body more than; Have at least one to intersect keyhole in the described keyhole, offer cooling duct in the described cylinder head body with described rocker shaft hole intersects; The intake grill of described cooling duct is arranged on the windward side of this cylinder head, when this windward side is motorcycle driving, and the cylinder head front that natural wind directly brushes; The exhaust outlet of cooling duct is arranged on other surface of this cylinder head; The diameter of described intersection keyhole is greater than the diameter of the attachment hole that is communicated with it, its inside is coaxially arranged with the cylindrical tube of length greater than the rocker shaft hole diameter, this cylindrical tube is arranged on the intersection of described intersection keyhole and rocker shaft hole, this intersection keyhole is used for lubricating oil bath and the external isolation with engine interior, by above-mentioned setting, make the cylinder head that offers cooling duct the lubricant oil phenomenon that leaks can not occur.

Because relief opening is usually located on the windward side of cylinder head,, the intake grill of cooling duct is at least one so being arranged on the left side of engine exhaust port or right side and intake grill; By increasing the quantity of intake grill, strengthen incoming air area, can improve air output, make this cylinder head have better heat dispersion.

The exhaust outlet of cooling duct is at least one, and this exhaust outlet is arranged on the top in engine spark plug hole.A plurality of exhaust outlets are set to be helped fast the heat of motor being discharged, and exhaust outlet is arranged on the top of spark plug, not only be convenient to processing, and make cooling duct more favourable to discharging heat by the top (this part is the higher zone of engine temperature) of engine cylinder.

The intake grill of described cooling duct and the adjacent of relief opening are circular arc, this circular arc is concentric with relief opening, because outlet pipe is the Cylinder-Head Temperature higher position, cooling duct is pressed close to relief opening and outlet pipe as much as possible, can better heat be taken away, and, the useful area of heat exchange is further strengthened by depending on the circular shape of relief opening.

Described cooling duct is the wedge that is inwardly shunk gradually by intake grill, and the sectional area at the intake grill place in this wedge air channel is bigger, and inner section is long-pending less, makes cooling air have the flow velocity higher than intake grill place in the air channel, accelerates cylinder head internal heat exchange speed.

In order to make this cylinder head have better heat dispersion, an air channel shim can also be set in described cooling duct at least, this shim and described cylinder head are wholely set, the area of contact of this cylinder head and cooling air is further strengthened, make its cooling-down effect more remarkable, simultaneously, shim also plays reinforing function, strengthen because of in establish loss of strength and the loss of rigidity that described cooling duct causes, prevent to be out of shape in processing, the using process excessive.

Lubricant oil does not leak in the motor in order to make, must seal with the keyhole that intersects that rocker shaft hole connects, make itself and motor good isolation, therefore, the cylindrical tube length that is provided with in the described intersection keyhole is set to the diameter greater than described rocker shaft hole, makes the gap between rocker shaft hole and the pitman arm shaft and is isolated by set cylindrical tube with the bolt hole that keyhole connects.

Because the cylindrical tube that is provided with can not influence interconnecting between the engine components, so, the internal diameter of described cylindrical tube is made as attachment hole equal diameters with corresponding connection, the bolt of connection engine components can be passed smoothly.

Because cylindrical tube must be arranged on the intersection of intersection keyhole and rocker shaft hole, so, for making set cylindrical tube skew not occur in actual use, thereby cause poorly sealed phenomenon, be made as with the camshaft fitting seat length of cylindrical tube contour because of being subjected to displacement.After bolt passes this cylindrical tube engine components is linked together, this cylindrical tube be fixedly installed on intersect keyhole and rocker shaft hole the intersection and can not move.

For further reaching the purpose of sealed cam axle fitting seat, also bind round on described cylindrical tube surface and to be provided with seal ring, and seal ring is at least two, and hoop is located at the two ends of described cylindrical tube respectively.

By technique scheme as can be known, the cooling duct of the utility model by in engine cylinder head, being provided with, the heat that motor produces when working is got rid of rapidly, cooling duct is passed through near top of combustion chamber, and this locates the hottest position of motor often, therefore, also just need most its radiating and cooling.By the efficiently radiates heat to motor, what make this motor can bring into play desirable power performance, simultaneously, owing to the heat output that has reduced to gas distribution system, reduces the temperature of gas distribution system, reduces the thermal distortion of its moving element, has increased the reliability of motor.

In addition, by a cylindrical tube is set in keyhole, with bolt hole in the pitman arm shaft and the partition that is communicated with that intersects between the keyhole, rocker shaft hole is sealed, make in the motor lubricant oil phenomenon that can not leak, also solve the technological problems that component are made simultaneously, make easy processing.

Description of drawings

Fig. 1 adopts cooling duct to reduce the scheme schematic representation of engine temperature at present;

Fig. 2 is the camshaft fitting seat schematic representation when only offering cooling duct;

Fig. 3 is the intake grill position view of a specific embodiment of the utility model;

Fig. 4 is the structural representation of a specific embodiment of the utility model;

Fig. 5 is the sectional drawing of above-mentioned specific embodiment;

Embodiment

Below, by specific embodiment and with reference to accompanying drawing the utility model is further described in detail.

Because when motorcycle engine produces high heat, motor is in high speed operation often, and this moment motorcycle normally under travelling state, and exhaust opening of engine is arranged on the surface that facings the wind of cylinder head just, so, in the utility model, the intake grill of cooling duct is arranged on the next door of relief opening, be beneficial in the cylinder head that cold wind enters motor.

Present embodiment is an example with a cylinder head that is provided with the motorcycle engine of single tracheae, as shown in Figure 3.In this embodiment, intake grill 2 is arranged on the right side of engine exhaust port 1, one side its near relief opening 1 be the circular arc concentric with relief opening 1, this shape helps to increase heat exchange area.The reason that intake grill 2 is arranged on this place is, exhaust ports has higher temperature, the intake grill 2 of this position makes cold wind just begin to carry out heat exchange after entering cylinder head, under the identical prerequisite of motorcycle running speed, the heat exchanger time of cooling air in the present embodiment in cylinder head is longer relatively, and heat exchange area is also corresponding bigger, and in addition, this place has the processing space that cooling duct is set.

As shown in Figure 4, present embodiment passes through top of combustion chamber with cooling duct, and makes its exhaust outlet 3 be arranged on the top of spark-plug hole.Because it is the highest that near the temperature the engine chamber top is generally, and spark plug is usually located at this place, this place also has the space that more Gong processing is provided with cooling duct simultaneously, and therefore, this place is more satisfactory exhaust outlet position.

Fig. 5 is the sectional view of present embodiment.Among the figure, the inside of intake grill 2 is contraction-like, and this cooling duct is the wedge air channel 211 of inwardly shrinking gradually, and this wedge air channel 211 bends at the top, and turns to the direction of spark-plug hole 4, and is divided into two exhaust outlets 3 by air channel shim 25.

Because this air channel shim 25 and cylinder head have the temperature identical with cylinder head for being wholely set.By this air channel shim 25 is set, can increase heat exchange area, improve radiating efficiency; Shim 25 also plays reinforing function, strengthen because of in establish loss of strength and the loss of rigidity that described cooling duct causes, prevent to be out of shape in processing, the using process excessive.

In the present embodiment, wedge air channel 211 and an attachment hole 61 connect, as shown in Figure 4.The corresponding connection of a keyhole on this attachment hole 61 and the camshaft fitting seat in vertical a plurality of (shown in the figure two) keyhole of offering.In the present embodiment, the rocker shaft hole 71 that level is offered on keyhole that is communicated with attachment hole 61 and the camshaft fitting seat intersects, so this keyhole is called as intersection keyhole 62.

The pitman arm shaft 72 that is in the rocker shaft hole 71 is stepped down in order to give intersection keyhole 62, therefore intersecting the position that keyhole 62 steps down with this and offer slot to make way at pitman arm shaft 72, but, owing to be subjected to the restriction of size, bolt hole 721 in this slot to make way and the pitman arm shaft 72 connects, and bolt hole 721 is communicated with the engine lubrication oil sump, makes that this lubricating oil bath can be by intersecting keyhole 62, wedge air channel 211 and external communications.When engine operation, because the pressure of lubricating oil bath is higher than external pressure, so lubricant oil will outwards be revealed.

In order the lubricant oil phenomenon that leaks not occur in the motor, present embodiment carries out encapsulation process to the camshaft fitting seat, and its processing mode is:

The diameter of keyhole 62 of intersecting that intersects with rocker shaft hole 71 in the camshaft fitting seat 7 is enlarged, make its diameter greater than the attachment hole 61 that is communicated with it, portion is coaxial within it is provided with an external diameter and is slightly less than this intersection keyhole 62 diameters, length is greater than the cylindrical tube 5 of rocker shaft hole diameter, this cylindrical tube 5 is arranged on the intersection of described intersection keyhole 62 and rocker shaft hole 71, and, the equal diameters of its internal diameter and the attachment hole 61 of corresponding connection.

Among the figure, the length of cylindrical tube 5 and camshaft fitting seat 7 are contour, promptly be full of the whole intersection keyhole 62 in the camshaft fitting seat 7, because the diameter of intersection keyhole 62 is greater than the diameter of the attachment hole 61 that is communicated with it, the equal diameters of the internal diameter of cylindrical tube 5 and the attachment hole 61 of corresponding connection, so, after bolt 8 couples together cylinder head and camshaft fitting seat 7, cylindrical tube 5 is encapsulated in the intersection keyhole 62 and can not moves, thereby the passage that forms between bolt hole 721 and the wedge air channel 211 is cut off.

In order to make the partition better effects if, also increased by two seal rings 51 at the two ends of cylindrical tube 5, sealing circle 51 hoops are located at the end of cylindrical tube 5, and embed the inwall of intersection keyhole 62, and the oil sump of engine interior and outside seal are cut off.

It should be noted that: offer a plurality of keyholes on the cylinder head of motor, the camshaft fitting seat, have only with rocker shaft hole and intersect, and intersect just to be provided with to seal in the keyhole and use cylindrical tube with the engine interior oil sump connects.

It should be noted last that: above embodiment is the unrestricted the technical solution of the utility model in order to explanation only, although the utility model is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the utility model, and not breaking away from any modification or partial replacement of spirit and scope of the present utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims (10)

1, a kind of natural air cooled cylinder head of sealed cam axle fitting seat, it comprises the cylinder head body and is arranged on camshaft fitting seat on the cylinder head body, level offers rocker shaft hole on this camshaft fitting seat, also vertically offers the keyhole that is communicated with set attachment hole in the cylinder head body more than; Have at least one to intersect keyhole in the described keyhole, it is characterized in that: offer cooling duct in the described cylinder head body with described rocker shaft hole intersects; The intake grill of described cooling duct is arranged on the windward side of this cylinder head; The exhaust outlet of cooling duct is arranged on other surface of this cylinder head; The diameter of described intersection keyhole is greater than the diameter of the attachment hole that is communicated with it, and its inside is coaxially arranged with the cylindrical tube of length greater than the rocker shaft hole diameter, and this cylindrical tube is arranged on the intersection of described intersection keyhole and rocker shaft hole.

2, the natural air cooled cylinder head of sealed cam axle fitting seat according to claim 1 is characterized in that: described intake grill is at least one, and this intake grill is arranged on the next door of engine exhaust port.

3, the natural air cooled cylinder head of sealed cam axle fitting seat according to claim 1 is characterized in that: described exhaust outlet is at least one, and this exhaust outlet is arranged on the top in engine spark plug hole.

4, according to the natural air cooled cylinder head of claim 1 or 2 or 3 described sealed cam axle fitting seats, it is characterized in that: the intake grill of described cooling duct and the adjacent of relief opening are circular arc, and this circular arc is concentric with relief opening.

5, the natural air cooled cylinder head of sealed cam axle fitting seat according to claim 4 is characterized in that: the wedge of described cooling duct for inwardly being shunk gradually by intake grill.

6, the natural air cooled cylinder head of sealed cam axle fitting seat according to claim 4 is characterized in that: described cooling duct is straight shape or bending shape; At least be provided with an air channel shim in the described cooling duct, this air channel shim and described cylinder head are wholely set.

7, the natural air cooled cylinder head of sealed cam axle fitting seat according to claim 1 is characterized in that: the attachment hole equal diameters of the internal diameter of described cylindrical tube and corresponding connection.

8, according to the natural air cooled cylinder head of claim 1 or 7 described sealed cam axle fitting seats, it is characterized in that: described cylindrical tube and camshaft fitting seat are contour.

9, according to the natural air cooled cylinder head of claim 1 or 7 described sealed cam axle fitting seats, it is characterized in that: described cylindrical tube surface hoop is provided with seal ring.

10, according to the natural air cooled cylinder head of claim 1 or 7 described sealed cam axle fitting seats, it is characterized in that: described seal ring is at least two, and binds round the two ends that are located at described cylindrical tube respectively.

Images