CN1054581C - Water-proof structure for power transmission box - Google Patents

Abstract

The power assembly is an integral constitution of automobile engine and transmission mechanism. The mattress surface corresponding to the transmission shell and cover which cover the transmission mechanism is installed with a rubber mattress in which, same as the mattress, the U-shape cross section of rubber mattress is inserted on one end of the shell and cover so that the protuberance part extended form the mattress covers the outer circumference part of other side of mattress surface.

Description

The waterproof construction of power transmission box

The present invention relates to vehicle, mainly is the transmission gearbox of the whole engine installation that constitutes of the combustion engine of two-wheeled motorcycle and transmission device and with the waterproof construction of gasket seal.

In technology in the past, engine installation is to use a kind of swing engine installation, and this device is integral combustion engine and transmission device, and on car body, the trailing wheel that supports with axle can swingingly be bearing on its rear end by easy on and off its front end with pivot suspension.

The example in the past (real fair 3-40711 communique) of having represented this swing engine installation among Fig. 8.

Fig. 8 is the cross-sectional plan views of this engine installation 01.

Be positioned at the combustion engine 02 of front end, its cylinder 02a direction is towards the place ahead, the transmission gearbox 05 of right crank case 04 and double as left side crank case lumps together, and forms the crank chamber, rear of engine installation, is fixedly mounting stepless speed change type driving pulley 06 at the left end towards the crank shaft 03 of left and right horizontal direction.

Transmission gearbox 05 rearward extends in the left side of car body, form the change-speed box case at its rear portion, the input shaft 09 of change-speed box 08, tween drive shaft 010 and output shaft 011 are bearing on the transmission case cover 07 and transmission gearbox 05 of the right openings that covers this change-speed box case, driven pulley 012 is corresponding with above-mentioned driving pulley 06, be installed on the input shaft 09, trailing wheel 013 is fixed on the output shaft 011.

The vee-belt 014 of annular is installed between outstanding driving pulley 06 of the left opening of the transmission gearbox 05 long from fore-and-aft direction and driven pulley 012, and lid 015 covers this transmission device from the left side.

The face of joint of transmission gearbox 05 and lid 015 is in the same plane, surrounds the periphery edge of transmission device, and the gasket seal 016 of rubber system is clipped between the face of joint, is screwed.

Gasket seal 016 makes and is approximately laterally long ring-type, the cross section is " コ " font, with the chimeric state of sealing surfaces as lid 015 face of joint under, contact with transmission gearbox 05, utilize tightening screw to clamp, form the waterproof construction that keeps the transmission gearbox inner sealing, do not intake.

In addition, sealing pad 016 adopts the rubber manufacturing that certain flexibility is arranged, use proper number tightening screw, moderately tighten screw, then the elasticity of rubber can absorb vibration, also can play the effect of vibrationproof.

Like this, gasket seal in the past, in order to obtain the effect of vibrationproof, the crimping part of gasket seal 016 and the sealing surfaces of transmission gearbox 05 can not be with big pressure leak-tight joint, and this engage pressure face is parallel with the vehicle direct of travel.

Because like this, when vehicle in the rain or ponding place when travelling, the water that front-wheel splashes dashes and spatters on the antetheca of transmission gearbox 05 and lid 015 (direct of travel of representing the water that splashes among Fig. 8 with the direction of arrow of long and two-short dash line) consumingly, at this moment hydraulic pressure directly is added on the engage pressure face of above-mentioned gasket seal 016 and transmission gearbox 05, water has overcome the thrust of gasket seal, can immerse inside.

If the increase tightening screw will cover and be screwed in tightly on the transmission gearbox, can prevent the immersion of sealing, still, vibration resistance reduces, and meanwhile, number of parts increases, and causes cost to increase, and weight also increases.

In view of this, the objective of the invention is to provide a kind of rotating box waterproof construction of engine installation, it can keep high vibration resistance, does not increase number of parts simultaneously, and water-proofness can improve again.

In order to achieve the above object, the present invention has designed a kind of transmission gearbox waterproof construction of engine installation, it is to make in the holistic engine installation at the combustion engine of vehicle and transmission device, the opposite face that the gasket seal of rubber system is installed in the transmission gearbox that is covered with above-mentioned transmission device and lid to sealing surfaces on, the Contraband font of the gasket seal of this rubber system partly is entrenched on the sealing surfaces of transmission gearbox and lid one side, is covered with the neighboring part of the sealing surfaces of opposite side from the extended jut of this rubber gasket sheet.

Because the Contraband font of gasket seal partly is entrenched in transmission gearbox or covers on the sealing surfaces of a side, its jut covers the neighboring part of the sealing surfaces of opposite side, the engage pressure face of any one gasket seal in gasket seal and transmission gearbox and the lid is not exposed to the outside, therefore, can not directly run on the engage pressure face by the water that the outside splashes on the transmission gearbox, can avoid the immersion of water like this, improve water-proofness.

Like this, use the gasket seal of the sort of in the past rubber-like rubber system, do not need to increase tightening screw, just can clamp, can keep vibration resistance with suitable pressure.

Above-mentioned gasket seal jut has certain clearance between the outer peripheral portion of the sealing surfaces of the above-mentioned opposite side that this jut and its covered is divided, owing to make chamfer shape at the front end of this jut, make the assembling of being undertaken improve by above-mentioned gap, like this, can absorb the influence that the skew of transmission gearbox and cover mold type causes, in on a large scale, form jut, utilization is by the effect of the next hydraulic pressure in outside, the front end distortion of jut, make above-mentioned gap turn narrow, more can improve water resistance.

In the above-mentioned gasket seal, above-mentioned jut is to do on the part that the antetheca by the antetheca of above-mentioned transmission gearbox and above-mentioned lid comes, avoided water to immerse the rear end of transmission gearbox antetheca, so, can enlarge the transmission gearbox front lower ends, improve the degree of freedom of the plans of establishment such as Starting motor, meanwhile, even under the condition of walking in the rain, the life-span of belt also can improve greatly.

Fig. 1 is the unitary side view of the two-wheeled motorcycle of relevant one embodiment of the present of invention.

Fig. 2 is the lateral plan that takes off the engine installation behind the lid.

Fig. 3 is the cross sectional drawing of this engine installation.

Fig. 4 is the unitary side view of gasket seal.

Fig. 5 is the section drawing along the V-V line cut-out of Fig. 4.

Fig. 6 is the section drawing along the VI-VI line cut-out of Fig. 4.

Fig. 7 represents to utilize the enlarged drawing of the waterproof construction main portion of packing seal ratio.

Fig. 8 is the cross sectional drawing of engine installation in the past.

1-two-wheeled motorcycle; 2-front-wheel; 3-front fork; 4-head pipe; 5-following vehicle frame; 6-back vehicle frame; 7-connecting rod; 8-shock absorber; 10-engine installation; 11-combustion engine; 12-cylinder; 13-crank shaft; 14-right crank case; 15-transmission gearbox; 16-transmission case cover; 17-change-speed box; 18-input shaft; 19-tween drive shaft; 20-output shaft; 21-trailing wheel; 22-alternating current generator; 23-driving pulley; 24-power-transfer clutch; 25-driven pulley; 26-non junction vee-belt; 27-reducing gear; 28-actuating motor; 30-lid; 35-gasket seal; 36-gap; 40-screw.

Below Fig. 1 is described to one embodiment of the present of invention shown in Figure 7.

Present embodiment is to be adapted at the structure used on the oscillating type engine installation 10 of small-sized two-wheeled motorcycle 1, and Fig. 1 is the unitary side view of this two-wheeled motorcycle 1.

From the beginning following vehicle frame 5 is managed 4 and is extended a little downwards, head pipe 4 can front fork 3 by free rotaring ground supporting, front fork 3 is supporting front-wheel 2 by axle, the lower end of following vehicle frame 5 is connected with the front end of pedal supporting part 6a, pedal supporting part 6a be along the back vehicle frame 6 horizontal component forwards extend, back vehicle frame 6 reaches the rear portion 6c that along continuous straight runs rearward extends through erecting part 6b, is that pedal supporting part 6a tilted rearward by this level up erects and erect part 6b.

The engine installation 10 of oscillating type, be installed in erecting on the part 6b of this back vehicle frame 6 by connecting rod 7, can shake by easy on and off, the rear portion of this engine installation 10 is to install by the shock absorber 8 between the rear portion 6c that is located at back vehicle frame 6, during walking, according to the situation that the road surface rises and falls, engine installation 10 can fluctuate with being bearing in rear end trailing wheel 21 with axle.

The combustion engine 11 that is placed on engine installation 10 front ends is the combustion engine of forced action type air cooling type, its cylinder 12 directed forward; Constitute the transmission gearbox 15 in the right crank chamber 14 and the crank chamber, a double as left side in crank chamber, at middle integrator, the crank shaft 13 towards the left and right horizontal direction of combustion engine 11 is being supported in this crank chamber, and crank shaft is free to rotate.

Transmission gearbox 15 rearward extends in the left side of car body, form change-speed box case 15a at its rear portion, trailing wheel 21 integrally is installed on the output shaft 20, output shaft 20 by transmission case cover 16 to the right distal process go out, transmission case cover 16 contains change-speed box 17 get up with mission case 15a.

Right-hand member at above-mentioned crank shaft 13 is provided with alternating current generator 22, fixing stepless speed change type driving pulley 23 at left end, on the other hand, negative pulley wheel 25, corresponding with above-mentioned driving pulley 23, be arranged on by power-transfer clutch 24 on the input shaft 18 of change-speed box 17, the input shaft of change-speed box 17 by above-mentioned mission case 15a left distal process go out, the annular vee-belt 26 on driving pulley 23 and driven pulley 25.

Change-speed box 17 carries out speed change by gear meshing, and with power from input shaft 18, be passed to output shaft 20 by tween drive shaft 19.

In addition, driving pulley 23 makes to have tooth on its periphery, can with reducing gear 27 engagement of lower end, be located at the actuating motor 28 (dotted portion among Fig. 2) of the right rear end of this reducing gear 27 driving, pass to crank shaft 13 by reducing gear 27, constitute the starting mechanism of driving engine.

The long transmission gearbox 15 of fore-and-aft direction forms the peripheral side wall 15b of a long annular arrangement, this peripheral side wall 15b has opening at left end, the vee-belt 26 of driving pulley 23, driven pulley 25 and the annular above them, reducing gear 27, actuating motor 28 are arranged on the inboard of this peripheral side wall 15b, and lid 30 covers transmission gearbox 15 from left end.

Lid 30 roughly constitutes by bottom surface 30a with the cooresponding peripheral side wall 30b of the peripheral side wall 15b of above-mentioned transmission gearbox 15, forms the bowl-shape of the circle that slightly is long.

The peripheral side wall 30b of the peripheral side wall 15b of transmission gearbox 15 and lid 30 remains on the surface that makes relative sealing surfaces 15c, 30c coincidence, accompanies gasket seal 35 between two sealing surfaces 15c and 30c, and lid 30 usefulness tightening screws 40 are tightened.

Fig. 2 represents to take off the side of covering 30 engine installation 10, and the sealing surfaces 15c of transmission gearbox 15 exposes.

Be provided with a plurality of screw hole 15d on the periphery edge of sealing surface 15c, the sealing surfaces 30c of the lid 30 that direction is relative makes identical shaped, has screw hole on cooresponding same position, and screw 40 runs through each screw hole, and is tightened in each screw hole.

Be contained in two gasket seal 35 usefulness rubber between sealing surfaces 15c, the 30c and make, as shown in Figure 4, its approximate shape is identical with sealing surfaces 15c, 30c, is long annular arrangement.

And, gasket seal 35, on its whole girths, as shown in Figure 5, be that the part 35a of " コ " font constitutes by the cross section, it is entrenched in covers on 30 the sealing surfaces 30c, meanwhile, as shown in Figure 6, the front end neighboring of gasket seal 35 forms jut 35b towards extending with the reverse side of the opening of " コ " font part 35a.

This jut 35b is located on front end the latter half of gasket seal 35, the inboard chamfering of the front end of jut 35b.

With relevant gasket seal 35, on its " コ " font part 35a, be embedded in advance on periphery one end that comprises the sealing surfaces 30c that covers 30 peripheral side wall 30b, sealing pad 35 is overlapped with the sealing surfaces 15c of transmission gearbox 15, utilize screw 40 to tighten lid 30 with the fastening force of appropriateness.

Like this, lid 30 is installed on the transmission gearbox 15 by gasket seal 35, and it is inner by inaccessible to pass case, can not intake, thereby gasket seal 35 plays waterproof action.

And, because lid 30 is by gasket seal 35, with the fastening force of appropriateness, utilize the screw 40 of proper number to be tightened on the transmission gearbox 15, therefore, can keep the elasticity function of the rubber of gasket seal 35 well, absorb vibration, can guarantee antihunt action.

Fig. 7 represents the peripheral side wall 15b of transmission gearbox 15 and lid 30, the front bulkhead face portion among the 30b, " コ " font part 35a of gasket seal 35 is entrenched in and covers on 30 the peripheral side wall 30b, from the jut 35b that this " コ " font part 35a extends out, cover the periphery peripheral side wall 15b of the sealing surfaces 15c of transmission gearbox 15 from front end.

Between the peripheral side wall 15b of this jut 35b and transmission gearbox 15, form the gap 36 of proper width.

When this two-wheeled motorcycle in walking in the rain or when walking at the ponding place, shown in the direction of arrow of long and two-short dash line among Fig. 1, front-wheel 2 splashes water come, splash the water that comes, shown in the direction of arrow of long and two-short dash line among Fig. 3 and Fig. 7, dash consumingly and spatter on the front bulkhead face portion of transmission gearbox 15 and lid 30, because the sealing surfaces 15c parallel with the engage pressure face travel direction of gasket seal 35,30c, utilize the jut 35b of gasket seal 35 and " コ " font part 35a with preceding end shield, water can not directly impact front end, therefore, no matter how high hydraulic pressure is, can prevent that also sealing immerses transmission gearbox inside from the engage pressure surface.

In the present embodiment, for the transmission gearbox 15 of keeping vibrationproof motivation, pinch-off seal pad 35 with cover 30 thrust and want appropriateness, not big than this appropriate thrust, however directly shock pressure face of joint so hydraulic pressure can not overcome thrust water is immersed owing to water.

In addition, when water during from frontal impact, because the front end of the effect of hydraulic pressure, jut 35b elastic deformation rearward bends, this is narrow to make gap 36, and water resistance has become better.

As implied above, waterproof construction according to the gasket seal 35 of present embodiment, when keeping anti-vibration functions, water resistance is improved, therefore need not increase tightening screw, increase fastening force, sacrifice anti-vibration functions, can not cause increase simultaneously yet along with screw in order to improve waterproof effect, cost increases, and weight increases.

Since do not need to change in the past transmission gearbox or the shape of lid, sealing pad 35 can use with gasket seal exchange in the past, therefore can in engine installation in the past, use easily, when keeping anti-vibration functions, can reach the purpose that improves water resistance simply.

Again, in the present embodiment, owing between the peripheral side wall 15b of the jut 35b of gasket seal 35 and transmission gearbox 15, be provided with the gap 36 of proper width, again by in transmission gearbox 15 that the chimeric lid 30 of gasket seal 35 is packed into the time, certain allowance is arranged and chamfering is arranged, therefore assembling is easy, and assembling is good.

Because gap 36 also can absorb the influence that the model bias by transmission gearbox and lid brings, therefore not only can be as above-mentioned embodiment, jut 35b is located on the part of gasket seal 35, and can in the most of vast scope of gasket seal, form jut, water resistance is further improved.

In the present embodiment, actuating motor 28 is configured in the front lower ends of transmission gearbox 15, yet the position of this actuating motor 28 also can be near the rear that is arranged at the jut 35b on the front end lower part of gasket seal 35, the place that waterproof effect is superior.

The present invention is because on the sealing surfaces of the side that the cross section of gasket seal is " コ " font partly is entrenched in transmission gearbox and lid, jut covers the neighboring part of the sealing surfaces of opposite side, all be exposed with the engage pressure face of transmission gearbox and any one gasket seal of lid, thereby, the water that flies to survey to the transmission gearbox from the outside can directly not impact with the engage pressure face, can avoid the immersion of water, reach the purpose that improves water resistance.

Can use to have the gasket seal of the sort of elastomeric rubber system in the past, not need to increase tightening screw, clamp, can keep the vibrationproof performance with appropriate pressure.

The jut of gasket seal and the outer peripheral portion of sealing surfaces have certain clearance between dividing, front end at this jut is made chamfer shape, the gap is improved assembling, can absorb the influence that transmission gearbox and cover mold type deviation cause, form jut in the larger context, the front end of jut is subjected to the effect of the hydraulic pressure next from the outside and is out of shape, and makes above-mentioned gap turn narrow, water resistance is further improved.

Owing to form jut on the part that the antetheca of the antetheca of transmission gearbox and lid clips in by gasket seal, can avoid water to be immersed into the rear end of the antetheca of transmission gearbox, therefore, the front lower ends of transmission gearbox can enlarge, the degree of freedom of the plan of establishment of actuating motor etc. can improve, meanwhile, the life-span of belt can improve greatly.

Claims (3)

1. the waterproof construction of a power transmission box, this engine installation is the engine installation that vehicle internal combustion engine and transmission device are made as a whole formation, the gasket seal of rubber system is placed on the sealing surfaces of relative direction of the transmission gearbox that covers above-mentioned transmission device and lid, the cross section of the gasket seal of rubber system is entrenched in for the part of " コ " font gasket seal by rubber system on the sealing surfaces of a side of transmission gearbox and lid, it is characterized in that the jut that extends out from the sealing pad covers the neighboring part of the sealing surfaces of opposite side.

2. the transmission gearbox waterproof construction of the described engine installation of claim 1, it is characterized by, the jut of above-mentioned gasket seal, and the outer peripheral portion of the sealing surfaces of the above-mentioned opposite side that covers of this jut gapped between dividing, make chamfer shape at the front end of this jut.

3. aforesaid right requires the waterproof construction of 2 described power transmission boxes, it is characterized by, and above-mentioned jut is on the part of doing between the antetheca of the antetheca of the above-mentioned transmission gearbox in being clamped in above-mentioned sealing and above-mentioned lid.

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