CN100431909C

CN100431909C - Front set absorber for motorcycle

Info

Publication number: CN100431909C
Application number: CNB2007100786936A
Authority: CN
Inventors: 张兴海; 李植
Original assignee: YUAN INNOVATION TECH Co Ltd
Current assignee: Chongqing Yuan Innovation Technology Group Co Ltd
Priority date: 2007-07-05
Filing date: 2007-07-05
Publication date: 2008-11-12
Anticipated expiration: 2027-07-05
Also published as: CN101085638A

Abstract

The right front set buffer of motorcycle comprises the bottom barrel, front fork tube and piston tube to form cavity I, II and III, with damping holes on the piston tube to connect the cavity I and II, with flow guide valve inside the damp to stick into the cavity I and facing downward. It can greatly improve the buffer effect, comfort, stability and safety.

Description

Front set absorber for motorcycle

Technical field

The present invention relates to a kind of motorcycle vibration absorber, particularly a kind of front set absorber for motorcycle.

Background technology

The purpose of motorcycle vibration absorber is to slow down motion to impact, and improves to drive traveling comfort and safety.At present common front set absorber for motorcycle structure as shown in Figure 3, it comprises end tube 1, front fork tube 2 and piston tube 3, the three forms chamber I11, chamber II12 and chamber III13 each other.The groundwork that damping force of vibration damper forms mainly is: (restore motion) when the 2 relative end of front fork tube tube 1 upward movement, fluid flows to chamber III13 by chamber I11 and chamber II12 by opening 10, and the fluid among its lumen II12 flows to by the damping hole on the piston tube 39 and flows to chamber III13 jointly after fluid among chamber I11 and the chamber I11 confluxes.According to the aperture principle of damming, form the dumping force of bumper during by damping hole 9 at fluid, slowing down motion thus and impacting.When the 2 relative end of front fork tube tube 1 moves downward (compression movement), the liquid flow path direction is opposite, and it is identical that dumping force produces principle.

The damping hole 9 of prior art is directly opened on piston tube 3 tube walls and is vertical with tube wall, and the aneroid conductance is to effect by effect only to have fluid, and the liquid of chamber I11 fails to be convened for lack of a quorum and forms mutual interference mutually with the liquid stream of chamber II12.Be embodied in: during high-speed motion, when the liquid stream of chamber I11 flows to chamber III13 by the piston pipe orifice, the liquid of high-speed motion fails to be convened for lack of a quorum and impacts and inhibition by the liquid stream formation that damping hole 9 flows out to the damping hole 9 of piston tube and from chamber II12, the fluid of chamber II12 outflow simultaneously also can form the fluid that chamber I11 flows through and disturb, influence the stable of dumping force, cause the big minor swing of dumping force.Simultaneously also hinder fluid and flowed to chamber III13, made chamber III13 can not get in time replenishing of fluid, formed vacuum.Such result can cause front fork tube 2 to occur idle running phenomenon (undamped power or dumping force are very little, and this situation of high speed is obvious more) suddenly by restoring motion when compression movement changes.When the 2 relative end of front fork tube tube 1 moves downward (compression movement), the fluid of chamber III13 flows to chamber I11 by piston tube and chamber II12 (opens during 5 compressions of one-way flow this moment valve, fluid also flows to chamber II12 by one-way flow valve 5 by chamber III13, but be not enough to the fluid of additional cavity II12, a large amount of fluid also need to flow to chamber II12 by damping hole 9 and form compression damping power).Because main liquid flow path direction is to flow to chamber I11 from chamber III13 by piston tube 3 endoporus, and the fluid of chamber II12 when can only forward breeches pipe 2 relative end tube 1 moving downward formed negative pressure with in the fluid suction chamber, owing in the III13 of chamber vacuum is arranged, therefore will inevitably occur fluid among the II12 of chamber sucks not enough and the generation vacuum phenomenon, such result can cause front fork tube 2 the idle running phenomenon to occur suddenly when restoring the motion transformation by compression movement, and (undamped power or dumping force are very little, this situation of high speed is obvious more), thereby influence damping effect, reduce the traveling comfort and the safety that drive.

In order to solve a series of problems that above-mentioned liquid flow disturbance is brought, those skilled in the art have carried out continuous exploration and experiment repeatedly, comprise damping hole is obliquely installed, but because the piston tube wall is thinner, role is very limited aspect water conservancy diversion and disturbance rejection, and practicality is little; Because the adverse effect that damping hole brings is not perceiveed by people, and nobody studies this naturally, says nothing of the appearance of terms of settlement, therefore up to the present all do not find a desirable terms of settlement simultaneously in over a long time.

Summary of the invention

At the prior art above shortcomings, the purpose of this invention is to provide the front set absorber for motorcycle that a kind of liquid stream does not disturb mutually, can avoid occurring at recovery and compression initial stage the idle running phenomenon.

Technical scheme of the present invention is achieved in that front set absorber for motorcycle, comprise end tube, front fork tube and piston tube, the three forms chamber I, chamber II and chamber III each other, on piston tube, be provided with damping hole, damping hole is communicated with chamber I and chamber II, be provided with diverter valve in damping hole, diverter valve stretches into chamber I and opening straight down.

The present invention is owing to be provided with a diverter valve that Open Side Down on the former damping hole of piston tube, when front fork tube restores motion, the fluid of chamber II turns to by the water conservancy diversion of diverter valve, be consistent with the fluid flow direction of chamber I and do not produce mutual interference mutually and resistance phenomenon, make fluid enter chamber III smoothly, avoid the formation of chamber III vacuum and caused the idle running phenomenon at the initial stage of restoring, also avoided the idle running phenomenon at compression initial stage, so more helped the stable of dumping force.During the front fork tube compression movement, the fluid of motion can flow to chamber II by the directional tagging of diverter valve and the negative pressure double action of chamber II, has avoided the appearance of vacuum like this and the idle running phenomenon at the initial stage of restoring can not occur.This shows that the present invention can improve the damping effect of bumper greatly, improved the traveling comfort that motor bike drives, stability and safety.

The present invention is skillfully constructed, and is simple in structure, changes very for a short time on the prior art basis, and cost increases few, and the contrast experiment shows that its effect is very remarkable, is very beneficial for applying.

Description of drawings

Fig. 1-structural representation of the present invention;

Fig. 2-Fig. 1 partial enlarged drawing;

Fig. 3-prior art structural representation.

Arrow represents that front fork tube restores the liquid flow path direction when moving among the figure.

The specific embodiment

The invention will be further described below in conjunction with accompanying drawing.

As depicted in figs. 1 and 2, the present invention includes end tube 1, front fork tube 2 and piston tube 3, front fork tube 2 lower ends are positioned at end tube 1 upper end, front fork tube 2 outer walls and end tube 1 inwall bearing fit.Piston tube 3 upper ends are positioned at front fork tube 2 lower ends, are provided with seal ring 4 between the two, and seal ring 4 is positioned at the circular groove on piston tube 3 outer walls.Termination, piston tube 3 upper end external diameter is than the big ladder that forms thus of remainder, is provided with one-way flow valve 5 between piston tube 3 external diameter smaller portions outer walls and front fork tube 2 inwalls and the ladder by one-way flow valve 5 and piston tube termination forms chamber II12 jointly.Piston tube 3 lower ends and end tube 1 bottom are fixed by screw 6 and simultaneously tube 1 bottom in the end are sealed.Piston tube 3 lower end outer walls, end tube 1 lower end inwall and the one-way flow valve 5 common chamber III13 that form.As can be seen, chamber II12 and chamber III13 cut off by one-way flow valve 5 from the figure.When front fork tube 2 restored motion, one-way flow valve 5 cut out, between chamber II12 and chamber III13 not directly by one-way flow valve 5.When front fork tube 2 compression movements, one-way flow valve 5 is opened, and communicates by one-way flow valve 5 between chamber II12 and chamber III13, and III13 part liquid stream in chamber directly enters chamber II12 by one-way flow valve 5.Front fork tube 2 upper ends are provided with plug 7, are provided with damping spring 8 between plug 7 and piston tube 3 upper ends.The bore portion that piston tube 3 endoporus and front fork tube 2 are positioned at the piston tube upper end forms chamber I11 jointly.Be provided with on damping hole 9, the bottom tube wall on piston tube 3 top tube walls and be provided with opening 10, damping hole 9 is communicated with chamber I11 and chamber II12, and opening 10 is communicated with chamber I11 and chamber III13.

More than be the present invention's part same as the prior art.Improvement of the present invention is, is provided with diverter valve 14 in damping hole 9, and the part that diverter valve 14 is positioned at chamber I11 is bent to form vertical section and horizontal segment downwards, and bending part is that arc is to reduce liquid flowing resistance.Bending back diverter valve 14 at the opening of chamber I11 towards parallel with piston tube 3.For the ease of the assembling between diverter valve 14 and the damping hole 9, described damping hole 9 is positioned at chamber II12 one side (being piston tube 3 outer walls one sides) and is stepped hole, the end that diverter valve 14 is positioned at damping hole 9 has and the cooresponding positive stop lug boss of this stepped hole, and positive stop lug boss directly presses fit in the stepped hole.Like this when front fork tube 2 restores motion, the water conservancy diversion of the fluid of chamber II12 by diverter valve 14 turns to when chamber II12 comes out to enter chamber I11 has just had the identical flow direction with the liquid stream of chamber I11, and can not produce the phenomenon of phase mutual interference and obstruction, make fluid enter chamber III13 smoothly, avoided the formation of chamber III13 vacuum, so more help the stable of dumping force, also avoided the idle running phenomenon at compression initial stage.Simultaneously, after increasing diverter valve 14, flow to chamber II12 under directional tagging that the fluid of front fork tube 2 compression movements can be by diverter valve 14 and the negative pressure double action of chamber II12, avoid the appearance of vacuum like this and the idle running phenomenon at the initial stage of restoring can not occur, improved the traveling comfort and the stability of bumper greatly.

Claims

1, front set absorber for motorcycle comprises end tube (1), front fork tube (2) and piston tube (3), and front fork tube (2) lower end is positioned at end tube (1) upper end, and piston tube (3) upper end is positioned at front fork tube (2) lower end; Termination, piston tube (3) upper end external diameter is provided with one-way flow valve (5) and also forms chamber II (12) jointly by the ladder of one-way flow valve (5) and piston tube termination than the big ladder that forms thus of remainder between piston tube (3) external diameter smaller portions outer wall and front fork tube (2) inwall; Piston tube (3) lower end outer wall, end tube (1) lower end inwall and one-way flow valve (5) form chamber III (13) jointly; The bore portion that piston tube (3) endoporus and front fork tube (2) are positioned at the piston tube upper end forms chamber I (11) jointly; Be provided with damping hole (9) on piston tube (3), damping hole (9) is communicated with chamber I (11) and chamber II (12), it is characterized in that: be provided with diverter valve (14) in damping hole (9), diverter valve (14) stretches into chamber I (11) and opening straight down.

2, front set absorber for motorcycle according to claim 1 is characterized in that: the vertical section of described diverter valve (14) is an arc with the transition portion of horizontal segment.

3, front set absorber for motorcycle according to claim 1 and 2, it is characterized in that: it is stepped hole that described damping hole (9) is positioned at chamber II (12) one sides, and the end that diverter valve (14) is positioned at damping hole (9) has and the cooresponding positive stop lug boss of this stepped hole.