CN205823358U - A kind of motorcycle engine high-performance camshaft - Google Patents

Abstract

The utility model discloses a kind of motorcycle engine high-performance camshaft, axis body is provided with admission cam and exhaust cam；It is provided with positive hole when at camshaft end face；Angle between admission cam maximum lift point and the line in axle center and exhaust cam maximum lift point and the line in axle center is 137 °；Exhaust cam maximum lift point and the line in axle center and positive angle between hole when and the line in axle center are 64 °.This utility model designs due to the reasonable lift data of intake and exhaust cam, makes electromotor enter row more fully, and air inflow reaches to maximize, more fuel mixture is had to burn in working stroke, in cylinder, explosion pressure raises, and improves the indicated horsepower of electromotor, thus effective power also correspondence improves.Under conditions of other parameter constants of electromotor, only changing this camshaft, power will improve about 2KW.

Description

A kind of motorcycle engine high-performance camshaft

Technical field

This utility model relates to motorcycle engine, particularly relates to motorcycle engine high-performance camshaft, belongs to motor Car camshaft technical field.

Background technology

Camshaft is parts in piston engine, and its effect is unlatching and the closed action controlling valve.Rub The main body of motorcycle engine cam is axis body, is cased with admission cam and exhaust cam above axis body, drives air inlet for correspondence Door and exhaust valve.It is provided with positive hole when, as timing marks at camshaft end face.One end of camshaft is bearings point, another End is connected with driving wheel.Owing to valve motion rule is related to power and the service performance of an electromotor, therefore camshaft Design in the design process of electromotor in occupation of highly important status.It is convex that those skilled in the art are devoted to motorcycle always The improvement design of wheel shaft, in the case of other parameters of electromotor are identical, it is possible to obtain higher power performance.

Utility model content

For deficiencies of the prior art, the purpose of this utility model is to provide a kind of motorcycle engine high Performance camshaft, this camshaft, under conditions of other parameter constants of electromotor, only uses this camshaft, and engine power is able to It is effectively improved.

To achieve these goals, the technical solution adopted in the utility model is as follows:

A kind of motorcycle engine high-performance camshaft, including axis body, is provided with admission cam and exhaust cam on axis body； It is provided with positive hole when at camshaft end face；It is characterized in that: the line in admission cam maximum lift point and axle center and exhaust cam are Angle between high-lift point and the line in axle center is 137 °；The line in exhaust cam maximum lift point and axle center and positive hole when with Angle between the line in axle center is 64 °；The base circle diameter (BCD) of admission cam and exhaust cam is 28mm.

The angle of admission cam and exhaust cam is with lift corresponding relation as shown in Table 1 and Table 2；

Table 1: admission cam angle and lift mapping table

Table 2:: exhaust cam angle and lift mapping table

This utility model designs due to the reasonable lift data of intake and exhaust cam, makes electromotor enter row more fully, air inflow Reaching to maximize, have more fuel mixture to burn in working stroke, in cylinder, explosion pressure raises, and improves electromotor Indicated horsepower, thus effective power also corresponding raising.Under conditions of other parameter constants of electromotor, only change this camshaft, Power will improve about 2KW.

Accompanying drawing explanation

Fig. 1-this utility model vertical section structure schematic diagram.

Fig. 2-this utility model end face structure schematic diagram.Fig. 2 upper arrow represents camshaft direction of rotation.

Fig. 3-this utility model camshaft and existing camshaft power contrast's curve chart.

Fig. 4-this utility model camshaft and existing camshaft moment of torsion correlation curve figure.

Detailed description of the invention

Below in conjunction with the accompanying drawings this utility model is described in further detail.

See Fig. 1-Fig. 2, it can be seen that this utility model motorcycle engine high-performance camshaft from figure, including axle Body 1, is provided with admission cam 2 and exhaust cam 3 on axis body 1；It is provided with positive hole when 4 at axis body 1 end face.Axis body 1 is positioned at row Gas cam is provided with the shaft shoulder 5 away from admission cam side.Admission cam maximum lift point is maximum with the line in axle center and exhaust cam Angle between lift points and the line in axle center is 137 °；The line in exhaust cam maximum lift point and axle center and positive hole when and axle Angle between the line of the heart is 64 °；The base circle diameter (BCD) of admission cam and exhaust cam is 28mm.

The angle of admission cam and exhaust cam is the most as shown in the table with lift corresponding relation；

Basic circle and cam lift relation determine the shape of intake and exhaust cam independence, both angle and the angle with positive hole when Degree relation determines the position relationship on camshaft, thus makes camshaft finally be fixed.

Owing to the lift data of intake and exhaust cam is optimized design, making engine breathing more abundant, air inlet is convex Wheel is opened in advance, delays closedown, and inlet period is long, and valve stroke increases, and air inflow increases, and aerofluxus simultaneously is faster.This structure exists Having more fuel mixture to burn in working stroke, in cylinder, explosion pressure raises, and improves the indicated horsepower of electromotor, thus Effective power is also corresponding to be improved.The advantage of this camshaft is, under conditions of other parameter constants of electromotor, only changes this cam Axle, power will improve about 2.5KW.Use this structure camshaft and existing common performance camshaft power and moment of torsion contrast As shown in Figure 3 and Figure 4.

This camshaft is the air inlet system and exhaust system geometric structure diamete according to 200ml displacement engine, cylinder diameter stroke, igniting spy Property etc. parameter and the optimal performance cam that designs, if using the electromotor of other discharge capacities, owing to air inlet system and exhaust system are several What size and change of cylinder diameter travel parameters, the oscillogram of air pulsing effect changes, it is necessary to other cam lift and Port timing can be only achieved optimum performance.

Above-described embodiment of the present utility model is only for this utility model example is described, and is not to this reality Restriction with novel embodiment.For those of ordinary skill in the field, the most also may be used To make change and the variation of other multi-forms.Here cannot all of embodiment be given exhaustive.Every belong to this reality Obviously changed with what novel technical scheme amplified out or change the row still in protection domain of the present utility model.

Claims (2)

1. a motorcycle engine high-performance camshaft, including axis body, is provided with admission cam and exhaust cam on axis body；? Camshaft end face is provided with positive hole when；It is characterized in that: admission cam maximum lift point is maximum with the line in axle center and exhaust cam Angle between lift points and the line in axle center is 137 °；The line in exhaust cam maximum lift point and axle center and positive hole when and axle Angle between the line of the heart is 64 °；

The angle of admission cam and exhaust cam is with lift corresponding relation as shown in Table 1 and Table 2；

Table 1: admission cam angle and lift mapping table

Table 2: exhaust cam angle and lift mapping table

Motorcycle engine high-performance camshaft the most according to claim 1, it is characterised in that: admission cam and aerofluxus are convex The base circle diameter (BCD) of wheel is 28mm.