CN1719064A

CN1719064A - V shape belt type stepless gear

Info

Publication number: CN1719064A
Application number: CNA2005100820603A
Authority: CN
Inventors: 石川秀男; 关谷义之; 阿隅通雄
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2004-07-09
Filing date: 2005-07-01
Publication date: 2006-01-11
Anticipated expiration: 2025-07-01
Also published as: TWI272353B; JP4573588B2; KR20060049772A; CN100404911C; ITTO20050282A1; TW200602573A; KR100635968B1; JP2006022927A

Abstract

The present invention provides a V-belt type continuously variable transmission in which one end of a slide gear is coupled to a movable pulley half body of a drive pulley so as to be relatively immovable in the axial direction and relatively rotatable around the axial line and the inner periphery of the slide gear threadedly engaged with the outer periphery of a cylindrical screw shaft in which the position of the axial direction and the position around the axial line are consistent, wherein a sealing function of a seal member between the inner periphery of a cover and the outer periphery of the slide gear is prevented from being deteriorated due to an abrupt pressure increase while avoiding the upsizing of a transmission case by employing a relatively small cover. The V-belt type continuously variable transmission is provided with an end wall 116a fixed to a screw shaft 115, formed in a bottomed cylindrical shape and equipped with an annular seal member 124 between the outer periphery of the slide gear 114 band the inner periphery of a cover 116 covering a screwing part of the slide gear 114 and a screw shaft 115. A communication hole 126 for communicating with the outside an annular chamber 123 formed in the cover 116 so as to be faced to the end of the slide gear 114, is provided to the screw shaft 115.

Description

V-belt formula stepless speed changer

Technical field

The present invention relates to V-belt formula stepless speed changer, and be fixed in fixed pulley half on the input shaft and constitute together between the movable pulley half of driving pulley and the described fixed pulley half and form trough of belt, in trough of belt, mount ring-type V-belt to the driven pulley side transferring power that is installed on output shaft, for making the change width of trough of belt, described movable pulley half can move axially relatively and can not be combined in rotatably on the described input shaft by described relatively input shaft, one end axis of the sliding gear that can slide along the axial direction of described input shaft can be linked on the described movable pulley half around axis with the relative rotation to not relatively moving, described sliding gear be screwed on the periphery with the thread spindle cylindraceous of described input shaft arranged coaxial axial position and certain interior week around the position of axis.

Background technique

Such V-belt formula stepless speed changer is known in patent documentation 1 grade for example.

Patent documentation 1: No. 2967374 communique of Japan Patent

Such V-belt formula stepless speed changer must be avoided invading dust and the phenomenon that has some setbacks that causes moving at the screwing part of the sliding supporting part of sliding gear or sliding gear and thread spindle, in above-mentioned patent documentation 1 disclosed device, cover the screwing part of sliding gear integral body and sliding gear and thread spindle by bigger cover.Yet, when being housed in this bigger cover in the gearbox, can cause the maximization of gearbox.

And dust can use sealed member to stop to the intrusion of the sliding supporting part of sliding gear, as long as only cover the screwing part of sliding gear and wheel hub with less cover, the sealed member of the ring-type of packing between interior week of covering and sliding gear periphery just can be avoided the maximization of gearbox.Yet, when for the movable pulley half that the speed change level promptly changed to the LOW side from TOP make driving pulley rapid when mobile to a side of the width that increases trough of belt, face an example opposite with movable pulley half sliding gear the end and the volume of annular chamber that is formed in the cover will shrink rapidly, make supercharging hastily in the annular chamber, thereby might damage the sealing function of the sealed member between the periphery of interior week of cover and sliding gear.

Summary of the invention

The present invention produces in view of the above problems, and its purpose is, a kind of V-belt formula stepless speed changer is provided, by using less cover, avoid the maximization of gearbox, simultaneously, can be because of the sealing function of the sealed member between the periphery of interior week of rapid supercharging infringement cover and sliding gear.

For realizing above-mentioned functions, first aspect present invention provides a kind of V-belt formula stepless speed changer, and be fixed in fixed pulley half on the input shaft and constitute together between the movable pulley half of driving pulley and the described fixed pulley half and form trough of belt, in trough of belt, mount ring-type V-belt to the driven pulley side transferring power that is installed on output shaft, for making the change width of trough of belt, described movable pulley half can axially relatively move and can not be combined on the described input shaft with the relative rotation, one end axis of the sliding gear that can slide along the axial direction of described input shaft can be linked on the described movable pulley half around axis with the relative rotation to not relatively moving, the interior week of described sliding gear with and the periphery of the thread spindle cylindraceous of described input shaft arranged coaxial screw togather, and axial position and certain around the position of axis, it is characterized in that, has the end wall that is fixed in described thread spindle, be formed with the round-ended cylinder shape, cover the sealed member that ring-type is housed between the periphery of interior week of cover of screwing part of described sliding gear and described thread spindle and described sliding gear simultaneously, make the other end that faces described sliding gear be formed at annular chamber in the described cover and the intercommunicating pore of external communications is located on described thread spindle or the described cover.

Second aspect present invention is on the basis of first aspect, installs antivibrating parts with respect to the certain and coaxial described thread spindle around this input shaft of the axial position of described input shaft between itself and the gearbox, thereby with respect to the sense of rotation location around its axis.

Invention according to the first aspect record, by cover the screwing part of sliding gear and thread spindle by cover, the sealed member of installing ring-type between the periphery of interior week of covering and sliding gear, thereby can use less cover to prevent that intrusion because of dust from causing moving not smooth phenomenon, can avoid the maximization of gearbox.And, make annular chamber and external communications in the cover owing to be situated between by intercommunicating pore, so avoided the phenomenon of annular chamber supercharging promptly, can not damage the sealing function of the sealed member between the periphery of interior week of cover and sliding gear because of supercharging promptly.

Invention according to the second aspect record, in the load that sliding gear bears, do not act on the antivibrating parts along the axial load of screw thread, and only the load of the sense of rotation of thread spindle acts on the antivibrating parts, therefore, can prolong the life-span of antivibrating parts, with the vibration-isolating support structure miniaturization of thread spindle.

Description of drawings

Fig. 1 is first embodiment's the power plant and the profile of trailing wheel;

Fig. 2 is the 2-2 line sectional drawing of Fig. 1;

Fig. 3 is with near the enlarged view the driving pulley of LOW state displayed map 2;

Fig. 4 is the thread spindle seen from the movable pulley side and the profile of support plate;

Fig. 5 is the sectional drawing of corresponding diagram 3 under the TOP state;

Fig. 6 is the sectional drawing of a magnifying show reduction gears mechanism part;

Fig. 7 is 7～7 line sectional drawings of Fig. 6;

Fig. 8 is the figure that sees cap assembly from the direction identical with Fig. 7;

Fig. 9 is the figure that sees cap assembly from a side opposite with Fig. 8;

Figure 10 is the sectional drawing of second embodiment's corresponding diagram 3.

Symbol description

16 bent axles as input shaft

51 gearboxes

58 driving pulleys

59 driven pulleys

61 output shafts

62 fixed pulley half

63 movable pulley half

64 troughs of belt

114 sliding gears

115 thread spindles

116 covers

The 116a end wall

120 vibration-proof rubbers as antivibrating parts

123 annular chamber

124 sealed members

126,159 intercommunicating pores

MV shape Belt-type Adjustable-speed machine

Embodiment

Below, with reference to embodiments of the invention shown in the drawings example of the present invention is described.

Fig. 1～Fig. 9 represents the first embodiment of the present invention, Fig. 1 is the profile of power plant and trailing wheel, Fig. 2 is the 2-2 line sectional drawing of Fig. 1, Fig. 3 is near the enlarged view the driving pulley of LOW state representation Fig. 2, Fig. 4 is the thread spindle seen from the movable pulley side and the profile of support plate, Fig. 5 is the sectional drawing of the corresponding diagram 3 of TOP state, Fig. 6 is the sectional drawing of a magnifying show reduction gears mechanism part, Fig. 7 is the 7-7 line sectional drawing of Fig. 6, Fig. 8 is the figure of the cap assembly seen from the direction identical with Fig. 7, and Fig. 9 is the figure from the cap assembly of seeing with Fig. 8 opposition side.

At first, in Fig. 1 and Fig. 2, by be disposed at as the motor E in trailing wheel WR the place ahead of driving wheel and be located at this motor E and above-mentioned trailing wheel WR between the power plant P that constitutes of V-belt formula stepless speed changer M be equipped on the vehicle body frame (not shown) of small size automatic two-wheel cycle, the trailing wheel WR axle that is disposed at right side, power plant P rear portion props up in the rear portion of power plant P.

The engine main body 11 of motor E comprises: crankcase 12, and the bent axle 16 that has parallel spin axis with the spin axis of trailing wheel WR is supported in its rotation freely; Cylinder block 13, it combines with crankcase 12; Cylinder head 14, it is combining with cylinder block 13 with crankcase 12 opposite sides; Cylinder head cover 15, it is combining with cylinder head 14 with cylinder block 13 opposite sides.

The axis that cylinder block 13 is configured to be located at the cylinder barrel 17 on this cylinder block 13 is inclined upwardly slightly forward along automatic two-wheeled cycle fore-and-aft direction approximate horizontal.In addition, crankcase 12 is by constituting at a pair of case halfbody 12a, the 12b of plane combination that comprises the said cylinder axis and be orthogonal to the axis of bent axle 16, in two

casees halfbody

12a, 12b, ball bearing 18 is housed, the annular seal parts 20 that roller bearing 19 are housed and dispose in the outer part between case halfbody 12a and the bent axle 16 between another case halfbody 12b and bent axle 16 than this roller bearing 19.

Chimeric sliding freely in said cylinder tube 17 have a piston 21, and bent axle 16 is situated between and is connected with piston 21 by crankpin 37 and connecting rod 38.Between cylinder head 14 and above-mentioned piston 21, form firing chamber 23.Control is equipped on the cylinder head 14 from the outlet valve 25 of the exhaust of above-mentioned firing chamber 23 to these firing chamber 23 air-breathing Aspirating valves 24 and controls, and making its general alignment on the projection drawing on the plane of the spin axis that is orthogonal to bent axle is V word shape.23 spark plug 26 is installed on the left lateral sides of cylinder head 14 with the state towards automatic two-wheeled cycle direction of advance the place ahead towards the firing chamber in addition.

Between cylinder head 14 and cylinder head cover 15, taken in valve actuating gear 30, above-mentioned Aspirating valves 24 of valve actuating gear 30 driven opening and outlet valve 25, it has the axis with the parallel axes of bent axle 16, be rotatably freely supported on the cylinder head 14, simultaneously, comprise camshaft 27 with air-breathing usefulness and

exhaust usefulness cam

28,29.

End at camshaft 27 is fixed with driven sprocket 31.On the other hand, on bent axle 16, the fixed-site of corresponding above-mentioned driven sprocket 31 has first driving sprocket wheel 32 in ball bearing 18 outsides, mount ring-type camshaft chain 33 on first driving sprocket wheel 32 and driven sprocket 31, camshaft chain 33 can be accommodated in the Transmitted chains chamber 34 that forms in cylinder block 13, cylinder head 14 and cylinder head cover 15 with advancing.Utilize 1/2 rotating speed drive cam shaft 27 rotations of such first driving sprocket wheel 32, driven sprocket 31 and camshaft chain 33 with the rotating speed of bent axle 16.

In the outside of first driving sprocket wheel 32, on bent axle 16, be fixed with second sprocket wheel 40.On the other hand, the oil pump 41 (with reference to Fig. 1) that machine oil is drawn in bottom in crankcase 12 makes cooling water in 43 coaxial connections of being located on cylinder block 13 and the cylinder head 14 of circuit cooling waterpump 42 (with reference to Fig. 1) of cooling jacket with being used for, be located at the bottom of crankcase 12, being situated between from second driving sprocket wheel 40 is delivered to said engine oil pump 41 and above-mentioned cooling waterpump 42 by Transmitted chains (not shown) with rotating power.

Dispose the generator 46 that has the fixing stators 47 of the right side cover 45 that is being installed on crankcase 12 right flanks and be fixed in the external rotor 48 on the bent axle 16 around this stator 47 in the outside of second driving sprocket wheel 40.

Between second driving sprocket wheel 40 and above-mentioned external rotor 48, dispose the coaxial bent axle 16 that centers on, the driven gear 49 that on this bent axle 16, can be supported with the relative rotation, this driven gear 49 is situated between and is connected with above-mentioned external rotor 48 by overrunning clutch 50.And, can be to the rotating power of above-mentioned driven gear 49 inputs from not shown starting motor, when generator E starts, come the driving force of self-drive motor to be passed on the bent axle 16, after generator E starting, since overrunning clutch 50 effects, and the transmission of power from bent axle 16 can not arrived the starting motor side.

V-belt formula stepless speed changer M is housed in a part that covers generator main body 11 from the side and is connected with in generator main body 11 and extends the accommodation chamber 56 in the gearbox 51 that is set to trailing wheel WR left side, gearbox 51 comprises: inboard case 52, and it links to each other with case halfbody 12b one among a pair of case halfbody 12a, the 12b that constitute crankcase 12; Outside case 53, it should inboard case 52 from outer side covers; Cover plate 54, it is anchored on the rear portion of inboard case 52 in outside case 53; Reduction gear box 55, it is sandwiched between the front portion of inboard case 52 and outside case 53, is formed with the gear chamber 57 that completely cuts off with accommodation chamber 56 between inboard case 52 and cover plate 54.

V-belt formula stepless speed changer M comprises: driving pulley 58, and it is installed on the other end as the bent axle 16 of input shaft of charging into from crankcase 12 in accommodation chamber 56; Driven pulley 59, it has the axis parallel with bent axle 16, is installed on the output shaft 61 by inboard case 52 and cover plate 54 rotations supporting freely; Ring-type V-belt 60, its from driving pulley 58 to driven pulley 59 transferring power.

Driving pulley 58 has the movable pulley half 63 that but the fixed pulley half 62 that is fixed in bent axle 16 and relative fixed pulley half are 62 approaching, separate, mount V-belt 60 for making, be formed at the change width of the trough of belt 64 of 63 of fixed pulley half 62 and movable pulley half, and the power that drives above-mentioned movable pulley half 62 vertically is situated between and is delivered to above-mentioned movable pulley half 63 by reduction gears mechanism 66 from being installed on electric motors 65 in the gearbox 51.

In addition, driven pulley 59 comprises: inner core 70, and it can rotate relatively, and is coaxial around output shaft 61; Urceolus 71, its can around axis relatively rotate and can relatively move along axial direction, chimeric inner core 70 slidably; Fixed pulley half 72, it is fixed on the inner core 70; Movable pulley half 73, itself and this fixed pulley half 72 subtends are fixed on the urceolus 71; Torque cam mechanism 74, it is located between inner core 70 and the urceolus 71, and is poor according to the relative rotatable phase of 72 of this movable pulley half 73 and fixed pulley half, at 72,73 axial component of effect of two pulley half; Spring bracket parts 75 clip the fixed-site of movable pulley half 73 on inner core 70 between itself and fixed pulley half 72; Helical spring 76, it is compressed between movable pulley half 73 and the spring bracket parts 75 around urceolus 71; Centrifugal clutch 77, it is located between inner core 70 and the output shaft 61, follow generator speed to surpass and set rotating speed and form power delivery status, V-belt 60 mounts on the trough of belt 78 that forms between the fixed pulley half 72 of driving pulley 58 and the movable pulley half 73.

And, the equilibrium of forces from V-belt 60 that the axial power of the interval that the fixed pulley half 72 of driven pulley 59 and movable pulley half are 73 by being produced by above-mentioned torque cam mechanism 74, the axial elastic force that is produced by helical spring 76 and acting on makes the interval of 73 of fixed pulley half 72 and movable pulley half expand the direction of opening decides, at driving pulley 58, when by make movable pulley half 63 near fixed pulley half 62 increase V-belts 60 to driving pulley 58 mount radius the time, V-belt 60 reduces to the radius that mounts of driven pulley 59.

Rotation is supported with the axletree 79 of trailing wheel WR freely on above-mentioned cover plate 54 and inboard cover 52, combines with engine main body 11 from the end of the outstanding axletree 79 of gearbox 51, is rotatably freely supported on the supporting arm 80 that is configured in trailing wheel WR right side.

Take in the reduction gear row 81 of being located at 79 of output shaft 61 and axletrees in gear chamber 57, these reduction gear row 81 comprise: first gear 82, and it is located on the output shaft 61; Second gear 84, it is parallel with output shaft 61 and axletree 79, is arranged on the jack shaft 83 that is rotatably freely supported on inboard case 52 and the cover plate 54, with 82 engagements of first gear; The 3rd gear 85, it is located on the jack shaft 83; The 4th gear 86, itself and the 3rd gear 85 mesh, and are located on the axletree 79.

On the sidewall of the outside of gearbox 51 case 53 and parts above-mentioned driving pulley 58 subtends, be provided with and be used to make cooling air to enter outer gas suction port 88 in the accommodation chamber 56, be provided with integratedly in the periphery of the fixed pulley half 62 of above-mentioned driving pulley 58 and be used to make the cooling air that enters from outer gas suction port 88 to be scattered in cooling fan 89 in the accommodation chamber 56.

The outer side surface of gearbox 51 is covered by case cover 90 and sound-insulating cover 91, case cover 90 covers the first half outer side surface of the gearbox 51 that comprises the part that disposes above-mentioned outer gas suction port 88, be fastened in a plurality of positions on the outside case 53 of gearbox 51, sound-insulating cover 91 is fastened in a plurality of positions on the outside case 53 of gearbox 51 at the latter half of outer side surface of the side covering gearbox 51 of corresponding driven pulley 59.

And, cover the front portion of sound-insulating cover 91 by the hinder marginal part of case cover 90, case cover 90 and sound-insulating cover 91 are installed on the gearbox 51, two boss part 91a of sound-insulating cover 91 front portions will be located at ... be sandwiched between the rear portion and gearbox 51 of case cover 90, utilize screw component 92 ... the hinder marginal part of case cover 90 and the front edge of sound-insulating cover 91 are fastened on the gearbox 51 together.And, between the front edge of the hinder marginal part of case cover 90 and sound-insulating cover 91, be formed on the intakeport 93 of rear side opening, between case cover 90 and gearbox 51, form the air importing chamber 94 that is communicated with intakeport 93.

Import chamber 94 sides from air and clog above-mentioned outer gas suction port 88, filter 95 is installed on the outer side surface of gearbox 51, import the outer gas that air import chambers 94 from intakeport 93 and be cleaned, in the suction accommodation chamber 56 by filter 95.

Between gearbox 51 and the sound-insulating cover 91 space between gearbox 51 and the sound-insulating cover 91 is divided into a plurality of for example three

close space

96,97,98, set for example four sound-insulating members 99,100,101,102.

Each sound-insulating member 99～102 forms wire respectively by the cut-out shaping of polyamine ester sheet, and the one side of these sound-insulating members 99～102 is bonded on one of gearbox 51 and sound-insulating cover 91 by binder, is bonded in the inner face of sound-insulating cover 91 in this embodiment.

Like this, the space that gearbox 51 and sound-insulating cover are 91 is distinguished into a plurality of spaces 96～98 of closing by sound-insulating member 99～102, thereby the noise of emitting from gearbox 51 absorbs and is suppressed by being disposed at sound-insulating member 99～102 between gearbox 51 and the sound-insulating cover 91, simultaneously, close space 96～98 and prevent sonorific resonance and be suppressed by being formed at a plurality of between gearbox 51 and the sound-insulating cover 91, can obtain sufficient noise with simple structure and prevent effect.

In Fig. 3, in gearbox 51, face the part of accommodation chamber 56, on bent axle 16, be provided with the 16a of circular segment portion toward the outer side, can not and this bent axle 16 rotate and clip the interior figure of the ball bearing 105 of band sealing between the inner and above-mentioned ring-type shoulder 16a of coaxial cylindric sleeve 104 around bent axle 16 around axis.In addition, screwing togather nut 106 in the outer end of bent axle 16, the fixed pulley half 62 of driving pulley 58 can not be installed on the bent axle 16 with the relative rotation, simultaneously, be sandwiched between the outer end of the pad 107 that contacts with nut 106 and sleeve 104, fixed pulley half 62 be fixed on the bent axle 16 by tightening nut 106.

The movable pulley half 63 of driving pulley 58 has coaxial cylindrical part 63a around above-mentioned sleeve 104 integratedly, the key 109 that chimeric and above-mentioned sleeve 104 engages in the pilot hole 108 that extends a circumferential place that is located at cylindrical part 63a vertically.Thus, movable pulley half 63 is can not rotate around axis on the bent axle 16 at sleeve 104, simultaneously, can carry out relatively moving of axial direction.And, because pilot hole 108 is located at the circumferential place of cylindrical part 63a,, thus, can alleviate because of the load on the loosening key 109 that causes so can make the gap between key 109 and keyway less.In addition, the sealed member 110 that ring-type is housed at inner end and 104 in the sleeve of above-mentioned cylindrical part 63a.

Coaxial cylindric carrying cylinder 111 around its cylindrical part 63a is installed on the movable pulley half 63, it can not carry out relatively moving of axial direction, but can rotate relatively, in two positions that clip above-mentioned pilot hole 108 from axial both sides, the sealed member 112,112 of ring-type is installed between cylindrical part 63a and carrying cylinder 111.

Can not move axially relatively the inner ring of the ball bearing 113 of ground mounting strap sealing in the periphery of above-mentioned carrying cylinder 111, the outer ring of this ball bearing 113 can not remain in as week in the end of the sliding gear 114 of the driven gear of reduction gear 66 with moving axially relatively.That is, an end of the sliding gear 114 that can move along the axial direction of bent axle 16 Jie can not be relatively rotated vertically and can be linked on the above-mentioned movable pulley half 63 around axis with relatively rotating by the ball bearing 113 of above-mentioned band sealing.

The outer ring of the ball bearing 105 of above-mentioned band sealing can not remain in the coaxial interior week that centers on the thread spindle cylindraceous 115 of bent axle 16 with moving axially relatively.That is, thread spindle 115 is the certain and coaxial thread spindles around bent axle 16 of axial position, at the periphery setting of this thread spindle 115 three spiral chutes 117 for example ..., the periphery of week and above-mentioned thread spindle 115 screws togather in the other end of above-mentioned sliding gear 114.

Refer again to Fig. 4, on above-mentioned thread spindle 115, fixing support plate 118,, on above-mentioned support plate 118, be fixed with cylindric installation tube 119 with axis parallel with bent axle 16 in position from the axis runout of above-mentioned bent axle 16.

In above-mentioned installation tube 119, insert the cylindric vibration-proof rubber 120 hot sticky cylindric collars 121 in periphery as antivibrating parts, screw togather on the inboard case 52 that is fastened on gearbox 51 by the bolt 122 that will insert logical this collar 121, making support plate 118 is that thread spindle 115 has above-mentioned vibration-proof rubber 120 to locate in gearbox 51 with respect to sense of rotation Jie around thread spindle 115 axis.

Be screwed together in the axial direction location of bent axle 16 and the power rotation that does not need sliding gear 114 utilizations on the thread spindle 115 that axis rotates to transmit through reduction gear 66 from electric motor 65, thereby movable pulley half 63 moves between LOW position shown in Figure 3 and TOP position shown in Figure 5 vertically, on above-mentioned support plate 118, be provided with the limiter 118a that limits the mobile terminal that movable pulley half 63 moves to the LOW position by engaging with sliding gear 114 integratedly in the LOW position, in addition, by engaging with sliding gear 114 in the TOP position, the limiter 128 of restriction movable pulley half 63 to the mobile terminal that the TOP position side moves is fixed on the inboard case 52 of gearbox 51.

The screwing part of above-mentioned thread spindle 115 and above-mentioned sliding gear 114 is covered by the cover 116 that has the end wall 116a that is fixed in thread spindle 115, is formed with the round-ended cylinder shape, and the sealed member 124 of ring-type is housed between the periphery of interior week of this cover 116 and sliding gear 114.

But be formed with the annular chamber 123 of the other end that faces above-mentioned sliding gear 114 in cover 116, corresponding movable pulley half 63 of the volume of this annular chamber 123 and sliding gear 114 move vertically between above-mentioned LOW position and above-mentioned TOP position and change.And, when for the speed change level is changed to the LOW side hastily from TOP, make movable pulley half 63 when a side of the width that increases trough of belt 64 is mobile hastily, the volume of annular chamber 123 shrinks hastily, make superchargings rapidly in the annular chamber 123, thereby might damage the sealing function of the sealed member 124 between the periphery of interior week of cover 116 and sliding gear 114.

Therefore, for empty chamber 125 sides that above-mentioned annular chamber 123 and periphery by the inner end of the cylindrical part 63a of interior week of interior week of the periphery of sleeve 104, thread spindle 115, sliding gear 114, movable pulley half 63 and carrying cylinder 111 are limited are communicated with, sidewall at thread spindle 115 is provided with the intercommunicating pore 126 that an end is communicated with above-mentioned annular chamber 123, simultaneously, the recess 127 that is communicated with above-mentioned empty chamber 125 of the other end that makes this intercommunicating pore 126 being provided with in interior week of thread spindle 115.

Though also corresponding movable pulley half 63 of the volume of above-mentioned empty chamber 125 and sliding gear 114 move vertically between above-mentioned LOW position and above-mentioned TOP position and change, but make the volume-variation ratio of speed change level above-mentioned annular chamber 123 of volume-variation ratio of above-mentioned empty chamber 125 when TOP changes to the LOW side little, make the speed change level when TOP changes to the LOW side, the pressure of annular chamber 123 increases degree because annular chamber 123 is communicated with empty chamber 125, and quilt is restrained lessly.

Refer again to Fig. 6, reduction gears mechanism 66 has and the electric motor 65 coaxial actuation gears that are connected 130 at least, the drive idler gear 134 that will constitute with being located at idling running shaft 133 with the gearwheel 131 of this actuation gear 130 engagements and small gear 132 one, in this embodiment, said gear reducing gear 66 also has second drive idler gear of being located between above-mentioned small gear 132 and the above-mentioned sliding gear 114 135, this second drive idler gear 135 by with the gearwheel 136 of above-mentioned small gear 132 engagements, with form with gearwheel 136 and constitute with the small gear 137 of sliding gear 114 engagement.

Constituting the inboard case 52 of a part of gearbox 51 and the part of reduction gear box 55 is that front side is outstanding than outside case 53 to cylinder head 14, limits roughly the through hole 138 of half cycle by part forwards more outstanding than outside case 53 among the surrounding wall portion 55a of reduction gear box 55 and is located on the reduction gear 55.On the other hand, have the mounting plate 139 that embeds the cylindrical part 139a in the above-mentioned through hole 138 airtightly and pass through a plurality of bolts 140 ... be fastened on the outside of reduction gear box 55, electric motor 65 with running shaft 141 of the axis parallel with bent axle 16 is fixed on the mounting plate 139, above-mentioned running shaft 141 connects above-mentioned cylindrical part 139a, charges in the gearbox 51.And actuation gear 130 forms with running shaft 141.

Coaxial and mutual subtend ground one is equipped with and is used to rotate the cylindrical bearing support 142,143 that supports idling running shaft 133 two end part that drive idler gear 134 has freely in reduction gear box 55 and inboard case 52, and the two end part of above-mentioned idling running shaft 133 are rotatably freely supported on the above-mentioned two bearings support 142,143 through ball bearing 144,145.

In addition, be equipped with the 55b of wall portion with the moving gearwheel 131 that surrounds the actuation gear 130 that links to each other with electric motor 65, a part that constitutes drive idler gear 134 and mesh with actuation gear 130 of the part association of the surrounding wall portion 55a of reduction gear 55 integratedly at the inner face of reduction gear box 55.

In that being installed on the reduction gear box 55, accommodation chamber 56 differentiations that forming between itself and the above-mentioned reduction gear box 55 in the gearbox 51 take in the cap assembly 147 of the reduction gear chamber 146 of above-mentioned actuation gear 130 and above-mentioned gearwheel 131.

Refer again to Fig. 7～Fig. 9, cap assembly 147 covers the end of the above-mentioned wall 55b of portion of reduction gear box 55, and with interior all subtends of above-mentioned surrounding wall portion 55a, the caulking gum 148 that contacts and contact in the end of the hot sticky and above-mentioned wall 55b of portion of the periphery of this cap assembly 147 with the inner face of above-mentioned periphery 55a.

In reduction gear box 55, outside inner face at above-mentioned wall 55b of portion and the 55b of this wall portion is provided with assembly department 149,150, the smooth installation arm 147a that setting integratedly contacts with above-mentioned assembly department 149 on cap assembly 147 reaches with above-mentioned assembly department 150 and contacts and crooked installation arm 147b, be not located at the inserting hole 151 that these install

arm

147a, 147b by inserting the reduction of fractions to a common denominator ... bolt 152 screw togather and be anchored on above-mentioned assembly department 149,150, cap assembly 147 is installed on the reduction gear box 55.

In addition, on cap assembly 147, charge in the reduction gear chamber 146 and be equipped with the cylindrical part 147c of the opening portion 153 of the circle that forms the small gear 132 that connects drive idler gear 134 integratedly, the front end of this cylindrical part 147c inserts the annular slot 131a of the gearwheel 131 of being located at above-mentioned drive idler gear 134, forms mazy type path 154 between cap assembly 147 and above-mentioned gearwheel 131.

Then, in Fig. 3 and Fig. 5, second drive idler gear 135 utilizes pin 157 and back-up ring 158 restrictive axial to move, and is installed on two end part and is rotated on the metallic running shaft 156 of supporting freely at the inboard case 52 and the reduction gear box 55 of gearbox 51.

And, be provided with gear 165 integratedly at reduction gear box 55 side ends of above-mentioned running shaft 156, be located at by worm screw 167 on the stroke sensor axle 166 of above-mentioned reduction gear box 55 rotations supporting freely and said gear 165 engagements.Stroke sensor axle 166 links to each other with not shown stroke sensor, detect the stroke of movable pulley half 63 in the driving pulley 58 by the rotating part of second drive idler gear 135 of a part that constitutes reduction gear 66, so can improve the maintainability of driving pulley 58, and can improve the stroke detection precision.

But, in the actuation gear 130, drive idler gear 134, second drive idler gear 135 and the sliding gear 114 that constitute reduction gear 66, second drive idler gear 135 is formed by the self lubricity resin, and actuation gear 130, drive idler gear 134 and sliding gear 114 are metallic gears.

The following describes this first embodiment's effect.On the movable pulley half 63 of a part that constitutes driving pulley 58, can not move axially relatively and can link an end of the sliding gear 114 that can slide with the relative rotation around axis along the axial direction of bent axle 16, at axial position and certain around the position of axis, screw togather interior week of sliding gear 114 with the periphery of the cylindric thread spindle 115 of bent axle 16 arranged coaxial, have the end wall 116a that is fixed in thread spindle 115, be formed with the round-ended cylinder shape and cover sliding gear 114 and the periphery of the interior week of the cover 116 of the screwing part of thread spindle 115 and sliding gear 114 between the sealed member 124 of ring-type is housed.

Therefore,, can prevent to cause the action of the screwing part of sliding gear 114 and thread spindle 115 to have some setbacks, can avoid the maximization of gearbox 51 because of the intrusion of dust by using less cover 116.

And, because the annular chamber 123 that the other end that faces sliding gear 114 is formed in the cover 116 is located on the thread spindle 115 with the intercommunicating pore 126 that the empty chamber 125 of outside is communicated with, so can avoid annular chamber 123 supercharging promptly, can eliminate the situation of damaging the sealing function of the sealed member 124 between the periphery of covering 116 interior week and sliding gear 114 because of supercharging promptly.

In addition, certain and coaxial above-mentioned thread spindle 115 around this bent axle 16 is by packing vibration-proof rubber 120 and with respect to the sense of rotation location around its axis between the inboard case 52 of itself and gearbox 51 with respect to the axial position of bent axle 16, therefore, load along the axial direction of thread spindle 115 from the load that sliding gear 114 is subjected to does not act on the vibration-proof rubber 120, only the load of the sense of rotation of thread spindle 115 acts on the vibration-proof rubber 120, the life-span of vibration-proof rubber 120 can be prolonged, and the vibration-isolating support structure miniaturization of thread spindle 115 can be made.

In addition, be arranged between the movable pulley half 63 of electric motor 65 and driving pulley 58, the reduction gear 66 that is accommodated in gearbox 51 has and the electric motor 65 coaxial actuation gears that link to each other 130 at least, with the drive idler gear 134 that will be arranged on formation on the idling running shaft 133 integratedly with the gearwheel 131 and the small gear 132 of these actuation gear 130 engagements, between the reduction gear box 55 of cap assembly 147 and gearbox 51, form reduction gear chamber 146, mark from the accommodation chamber 56 in the gearbox 51 reduction gear chamber 146, take in actuation gear 130 and gearwheel 131, form mazy type path 154 between this cap assembly 147 and the gearwheel 131, simultaneously, form the opening portion 153 that connects small gear 132, be installed on the reduction gear box 55 of gearbox 51, therefore, can utilize less cap assembly 147 to prevent in reduction gear 66 particularly at the engagement actuation gear 130 often and the engaging piece intrusion dust of drive idler gear 134, can avoid gearbox 51 to maximize, improve the life-span of reduction gear 66.

In addition, on the reduction gear box 55 of a part that constitutes gearbox 51, the bearing at end support 142 that idling running shaft 133 is supported in rotation freely is set, simultaneously, the assembly department 149,150 of cap assembly 147 is set, therefore, more microrelief becomes mazy type path 154, realizes the raising of sealability.In addition, as this embodiment, be rotated when being bearing on reduction gear box 55 and the inboard cover 52 freely at the two end part of the idling running shaft 133 of drive idler gear 134, by when assembling V-belt formula stepless speed changer M, drive idler gear 134 anti-avulsions being remained on reduction gear box 55 sides, can improve assembling performance by cap assembly 174.

In addition, second drive idler gear 135 that reduction gear 66 comprises between the small gear 132 and sliding gear 114 that is loaded on metal drive idler gear 134, utilizes the self lubricity resin to form, in reduction gear 66, gear engagement portion outside reduction gear chamber 146, can carry out resin lubrication, lubricating structure be simplified, in addition, resinous second drive idler gear 135 is configured in the space of the broad outside the reduction gear chamber 146 in gearbox 51, can improves cooling.

Figure 10 represents the second embodiment of the present invention, in the axial direction of bent axle 16 location and the screwing part of thread spindle 115 that rotate around axis and sliding gear 114 is not by having the end wall 116a that is fixed in thread spindle 115, cover 116 coverings that are formed with bottom tube-like, and the sealed member 124 of ring-type is housed between the periphery of interior week of this cover 116 and sliding gear 114.

Be communicated with for making the other end that faces sliding gear 114 be formed at the annular chamber 123 of cover in 116 and gearbox 51 interior accommodation chambers 56, the intercommunicating pore 159 that one end is communicated with above-mentioned annular chamber 123 tops is located on cover 116 the end 116a and support plate 118, the fixed outside of support plate 118 cover above-mentioned intercommunicating pore 159 the other end and towards above the connection escutcheon 160 of opening.

According to this second embodiment, for making the speed change level promptly change to the LOW side from TOP, the side shifting that movable pulley half 63 is promptly increased to the width that makes trough of belt 64, thus, even the volume of annular chamber 123 sharply shrinks, also can restrain the supercharging of annular chamber 123, can not make the function of damaging the sealed member 124 between the periphery of cover 116 interior week and sliding gear 114 because of supercharging promptly.

Embodiments of the invention have been described more than, but have the invention is not restricted to the foregoing description that only otherwise break away from the scope of claim, the present invention can carry out various design alterations.

Claims

1, a kind of V-belt formula stepless speed changer, and be fixed in fixed pulley half (62) on the input shaft (16) and constitute together between the movable pulley half (63) of driving pulley (58) and the described fixed pulley half (62) and form trough of belt (64), in described trough of belt (64), mount ring-type V-belt (60) to the driven pulley that is installed on output shaft (61) (59) side transferring power, described movable pulley half (63) can not be combined on the described input shaft (16) with the relative rotation for the change width that makes described trough of belt can axially relatively move, one end of the sliding gear (114) that can slide along the axial direction of described input shaft (16) can not axially relatively move and can be connected in the relative rotation on the described movable pulley half (63) around axis, on the periphery that is screwed on thread spindle cylindraceous (115) interior week of described sliding gear (114), described thread spindle cylindraceous (115) axial position and certain around the position of axis, with described input shaft (16) arranged coaxial, it is characterized in that, has the end wall (116a) that is fixed in described thread spindle (151), be formed with the round-ended cylinder shape, cover the sealed member (124) that ring-type is housed between the periphery of interior week of cap assembly (116) of screwing part of described sliding gear (114) and described thread spindle (115) and described sliding gear (114) simultaneously, make the other end that faces described sliding gear (114), be formed at the intercommunicating pore (126 of interior annular chamber (123) of described cover (116) and external communications, 159) be located on described thread spindle (115) or the described cover (116).

2, V-belt formula stepless speed changer as claimed in claim 1, it is characterized in that, with respect to the axial position of described input shaft (16) certain and coaxial around this input shaft (16) described thread spindle (115) and gearbox (51) between antivibrating parts (120) is housed, thereby described thread spindle (115) is located with respect to the sense of rotation around its axis.