CN2918744Y

CN2918744Y - Distribution mechanism for motorcycle push-rod type engine

Info

Publication number: CN2918744Y
Application number: CN 200620058512
Authority: CN
Inventors: 韩福林
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-04-30
Filing date: 2006-04-30
Publication date: 2007-07-04
Anticipated expiration: 2016-04-30

Abstract

The utility model relates to a novel coplanarity valve mechanism used on a CG engine of a motorbike. A valve pushes a lower rocker arm to swing through the rotation of a lower camshaft and further pushes the carrier rods on an inlet valve and an exhaust valve to do up-and-down movement to push an upper rocker arm to swing, which compresses an inlet valve spring for opening the inlet valve and the exhaust valve. The utility model is characterized in that the surfaces of the two valve carrier rods are parallel to the engine center, viz. vertical to the upper and lower rocker arm shafts; because of the coplanarity of the inlet and exhaust valve carrier rods, which are parallel to the engine center, the angles between the inlet and exhaust valve carrier rods are eliminated so as to greatly reduce the striking noise of the rocker arm; meanwhile, because the axial stress is eliminated, the power consumption of the valve mechanism is reduced by 12% so as to effectively reduce the abrasion and power consumption of the valve mechanism to obviously increase the dynamic performance and oil consumption performance of the engine.

Description

A kind of distribution device of motorcycle push rod h type engine h

Technical field

The utility model relates to a kind of distribution device of motorcycle engine, especially relates to a kind of novel " coplane distribution device " of CG motor.

Background technique

In motorcycle engine, the CG125 motor is simple in structure because of it, uses easy to maintenancely, accepted by domestic consumers in general, and its accessory is abundant, and highly versatile has been subjected to liking of Consumer especially.But existing C G motor also exists the some shortcomings part at the distribution device design aspect, as above the problems such as abnormal sound of lower shake-changing arm motion generation.Because of the CG machine also claims the push rod machine, be that valve is to rotate by lower arranging cam axle to promote the lower shake-changing arm swing, and then promotion inlet and outlet door push rod, pump by the inlet and exhaust valve push rod and to promote upper rocker arm swing, open the inlet and outlet door behind the swing compression inlet and exhaust valve spring of upper rocker arm, because inlet and outlet door push rod becomes the three-dimensional spatial arrangement (see figure 1) in machine, when its work, can be divided into the component (seeing that Fig. 2 and push rod and rocking arm are subjected to the vector of force sketch) of three directions for the Driving force of valve stem from camshaft and lower shake-changing arm:

A, along the component of motor fore-and-aft direction, establish it for Px, belong to useless component because structural limitations temporarily can't be eliminated, engine sound and power character are not had big influence; (Px is not expression in vector diagram)

The component of b, promotion upper rocker arm rotary oscillation is established it and is Py, belongs to effective force;

C, along pitman arm shaft up and down to component, establish it and be Pz, it is the power that makes lower shake-changing arm left and right sides play generation impact noise.

By analyzing as can be seen, owing to the reason Px of structural limitations temporarily can't overcome, this power is useless power; Py is the power that promotes the upper rocker arm rotary oscillation, is the useful power that is used to push open valve, is indispensable.Because motor push rod and engine center axis have one 7 ° angle, also promote upper and lower rocking arm and move and cause about upper and lower rocking arm the power of bump abnormal sound along the pitman arm shaft direction with regard to having produced, be deleterious effects power Pz, because valve constantly opens and closes, this power is alternating force.

With vector method calculate this power sizableness in valve stem stressed 12%.Static pressure by spring is calculated, and approximately is 14kg, but in fact owing to the high-speed motion of this mechanism, motion inertia force is far longer than this power.It is useless and harmful to the unlatching of valve, and this power is that size constantly back and forth changes, and it constantly makes upper rocker arm left-hand bump bearing, makes lower shake-changing arm constantly clash into distribution, bump about upper and lower rocking arm and produce unnecessary abnormal sound.The high speed swinging of last lower shake-changing arm, it is with the rocker arm support that faces mutually and push away bolt and be in the kinetic friction state for a long time, therefore the axial play of upper and lower rocking arm is constantly enlarged; the impact noise of rocking arm is also just increasing; Here it is uses engine mechanical noise more of a specified duration to become one of big reason, but also cause distribution device power consumption and wearing and tearing to increase.

The model utility content

The purpose of this utility model just provides a kind of distribution device of motorcycle CG h type engine h, and it has been eliminated push rod and has acted on axial force on the valve rocker, thereby has significantly reduced the impact noise of eliminating rocking arm.

For achieving the above object, the distribution device of motorcycle CG h type engine h of the present utility model, valve rotates by lower arranging cam axle and promotes the lower shake-changing arm swing, and then promote inlet and outlet door push rod and pump and promote the upper rocker arm swing, open the inlet and outlet door behind the swing compression inlet and exhaust valve spring of upper rocker arm, it is characterized in that: described two valve stem planes are parallel with engine center, promptly become 90 ° of quadratures with upper and lower pitman arm shaft.

The beneficial effects of the utility model are: owing to of the present utility modelly advance, exhaust valve push rod coplane and with the engine center plane parallel, promptly with last, the lower shake-changing arm axle becomes 90 ° of quadratures, eliminated, the angle on exhaust valve push rod and engine center plane, therefore, also just alleviated the impact noise of rocking arm greatly, simultaneously, owing to eliminated axial force, make the distribution device power consumption reduce 12%, effectively reduced the wearing and tearing and the power consumpiton of distribution device, engine power performance and oil consumption performance all are significantly improved, facts have proved, above-mentioned design is reasonably, can be used for producing in batches.

Description of drawings

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

Fig. 1 is existing motorcycle CG125 motor inlet and outlet door push rod perspective view.

Fig. 2 is subjected to the vector of force sketch for push rod and rocking arm.

Fig. 3 is that A along Fig. 1 is to view.

Fig. 4 is this motor cycle CG125 motor inlet and outlet door push rod coplanar structure side view.

Among the figure: 1 push rod, 2 cams, 3 upper rocker arms, 4 lower shake-changing arms, 5 upper rocker arm ball-and-sockets, 6 lower shake-changing arms (exhaust valve rocker arm) ball-and-socket.

Embodiment

As shown in Figure 2 to Figure 3, existing motorcycle CG125 engine valve actuating mechanism.

This motor cycle CG125 motor inlet and outlet door push rod coplanar structure shown in Figure 4, through redesign, upper rocker arm ball-and-socket center 5 and valve adjuster have increased 10mm by push rod one side shaft to distance, lower shake-changing arm is designed to inlet valve rocker and lower shake-changing arm (exhaust valve rocker arm) ball-and-socket 6 moves 7mm to engine center respectively, like this, make inlet and outlet door push rod coplane and with the engine center plane parallel, promptly become 90 ° of quadratures with upper and lower pitman arm shaft, 7 ° of above-mentioned angles have been eliminated, therefore, sound and using effect have preferably also just been obtained.

Claims

The distribution device of 1 one kinds of motorcycle push rod h type engine hs, valve rotates by lower arranging cam axle and promotes the lower shake-changing arm swing, and then promote the inlet and exhaust valve push rod and pump and promote the upper rocker arm swing, open inlet and exhaust valve behind the swing compression inlet and exhaust valve spring of upper rocker arm, it is characterized in that: described two valve stems (1) plane is parallel with engine center, promptly becomes 90 ° of quadratures with upper and lower rocking arm (3,4) axle.