CN102030072A - Variable speed pulley and bicycle driving device with the same - Google Patents
Variable speed pulley and bicycle driving device with the same Download PDFInfo
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- CN102030072A CN102030072A CN 201010297287 CN201010297287A CN102030072A CN 102030072 A CN102030072 A CN 102030072A CN 201010297287 CN201010297287 CN 201010297287 CN 201010297287 A CN201010297287 A CN 201010297287A CN 102030072 A CN102030072 A CN 102030072A
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Abstract
The present invention provides a variable speed pulley which can cause smooth change of separation distance of two pulley pieces and a bicycle driving device with the same. The variable speed pulley (10) is provided with the following components: a cylindrical hub (11) connected with a rotating a rotating shaft, two pulley sheets (12,13), two torque cams (14,15), and two force applying devices (20,21). The two pulley sheets are respectively equipped on the outer peripheral part of the hub. A V groove for keeping a wheel belt with a V-shaped section is formed between two opposite surfaces of the pulley sheets. Two torque cams are respectively set on the two cam sheets. Each torque cam is composed of two torque cam sheets (16,17(18,19)) which can movably fasten in a spiral direction and are respectively fixed on the hub and the pulley sheets (12,13). The force applying devices are respectively provided on the two pulley sheets (12,13) and apply force to the pulley sheets (12,13) in a direction of separating the two pulley sheets.
Description
Technical field
The bicycle drive unit that the present invention relates to the speed change belt wheel and use this speed change belt wheel.
Background technology
Known in the past have in order to change rotating speed transmitting rotary power and change the speed change belt wheel of the winding diameter of wheel band recently.
For example, the variable velocity zone wheel of patent documentation 1 record has: barrel-contoured hub, and it is fixed on the S. A.: the fixed pulley sheet, it is fixed on the hub; The movable pulley sheet, it is slidably mounted on the hub, the wheel band of clamping section V word shape between movable pulley sheet and fixed pulley sheet; Torque cam mechanism (torque cam); And compression coil spring, its to fixed pulley sheet side to the movable pulley sheet application of force.Torque cam mechanism has: cylindrical body, and it is formed with the cam path that extends on hand of spiral, and described cylindrical body is fixed on the movable pulley sheet; And cam pin, its outstanding being arranged on the hub, and insert in the cam path.When rotating in movable pulley trailing wheel band holding capacity and with respect to hub, one partial rotation power is transformed to axial power by torque cam mechanism, and the movable pulley sheet moves to the direction near fixed pulley in the axial direction.
In this speed change belt wheel, have: push the power on the direction of expansion between with movable pulley sheet and fixed pulley sheet by wheel band in effect on the movable pulley sheet; The application force of compression coil spring; By torque cam mechanism produce near the power on the direction of fixed pulley sheet.Act on the size of these power on the movable pulley sheet by change, can make the movable pulley sheet be toward or away from the fixed pulley sheet, thereby change the winding diameter of wheel band.
Patent documentation 1: Japan opens flat 3-114491 communique in fact
But in the speed change belt wheel of patent documentation 1 record, the fixed pulley sheet is fixed on the hub, and the movable pulley sheet is moved, and the separating distance of 2 belt wheel sheets is changed, and therefore is difficult to make the separating distance of 2 belt wheel sheets successfully to change.
Summary of the invention
Therefore, the object of the present invention is to provide speed change belt wheel that a kind of separating distance that can make 2 belt wheel sheets successfully changes and the bicycle drive unit that uses this speed change belt wheel.
Speed change belt wheel of the present invention is characterised in that to have: barrel-contoured hub is connected with S. A.; 2 belt wheel sheets can be slidingly arranged in the peripheral part of described hub respectively on axial and circumferencial direction, and are formed for the V groove of the wheel band of clamping section V word shape between mutual face in opposite directions; 2 torque cam mechanisms are formed by 2 torque cam mechanism sheets respectively, and are separately positioned on described 2 belt wheel sheets, and wherein, described 2 torque cam mechanism sheets can engage on hand of spiral movably, and are separately fixed on described hub and the described belt wheel sheet; 2 force application apparatus, the direction of separating to described 2 belt wheel sheets are to the described belt wheel sheet application of force, and are separately positioned on (first invention) on described 2 belt wheel sheets.
2 belt wheel sheets are connected with hub by 2 torque cam mechanisms, and the rotational force of 2 belt wheel sheets is passed to hub via torque cam mechanism.Under the little situation of the pulling force of wheel band, 2 belt wheel sheets separate by the application force of 2 force application apparatus, and the winding diameter of the wheel band on the speed change belt wheel diminishes.At this moment, the belt wheel sheet is moved to hand of spiral by the torque cam mechanism guiding.On the other hand, when the pulling force of wheel band is big, the power that each belt wheel sheet bears by the trailing wheel band and rotating relatively with respect to hub.Power on the part of its rotational force is transformed to axially by torque cam mechanism, 2 belt wheel sheets are approaching thus, and wheel becomes big with the winding diameter of the wheel band on the belt wheel.
When the separating distance that makes 2 belt wheel sheets changed, 2 belt wheel sheets rotated relatively with respect to hub together, therefore, compared with the situation that only made a belt wheel sheet rotation in 2 belt wheel sheets like that in the past, and they are changed.
The speed change belt wheel of second invention is in described first invention, described 2 belt wheel sheets are alignment arrangements 2 cylindrical body in the axial direction, the axial end portion of a cylindrical body in described 2 cylindrical body is formed with notch, described notch has the edge part that extends at hand of spiral, axial end portion in another cylindrical body is formed with jut, described jut is outstanding in the axial direction, can engage with described notch slidably on hand of spiral with respect to described notch.
According to this structure, the torque cam mechanism sheet is the cylindrical body that is formed with jut or notch in the end, and simple shape is easy to make.
In addition, constitute the axial end portion engaging of 2 torque cam mechanism sheets of 1 torque cam mechanism, 2 torque cam mechanism sheets area of contact each other is big, therefore, not in the big power of the local action of torque cam mechanism sheet, thereby is difficult to occur distortion or damaged.Therefore, can make 2 belt wheel sheets contact successfully or separation chronically.
The speed change belt wheel of the 3rd invention is in described first invention, a torque cam mechanism sheet in described 2 torque cam mechanism sheets is the cylindrical body that is formed with the cam path that extends at hand of spiral, another torque cam mechanism sheet has cam pin, described cam pin inserts in the described cam path, can move along described cam path.
According to this structure, cam pin inserts in the cam path, only can move in cam path, so 2 torque cam mechanism sheets can the engagement release state, and can keep fastening state always.Therefore, can stably make 2 belt wheel sheet contacts or separation.
The speed change belt wheel of the 4th invention is in the described second or the 3rd invention, and described force application apparatus is that the described belt wheel sheet application of force is made the turned round coil spring of described belt wheel sheet with respect to described hub rotation.
Act on 2 torque cam mechanism sheets that the application force of being turned round helical spring circumferencial direction on the belt wheel sheet is separately fixed on this belt wheel sheet and the hub and be transformed to axial power, thus, the belt wheel sheet is the application of force on the direction that 2 belt wheel sheets separate in the axial direction.
Though it is relevant with the angle of the hand of spiral of the notch of torque cam mechanism sheet or cam path, but with make the belt wheel sheet in the axial direction only mobile phase with the extension coil spring of distance compare, turned round the winding number that coil spring can reduce spring coil, therefore can be shortened axial length.Thereby can make the miniaturization of speed change belt wheel.
The speed change belt wheel of the 5th invention is characterised in that in described the 3rd invention, not have described 2 force application apparatus.
Under the little situation of the pulling force of wheel band, the belt wheel sheet diminishes with respect to the relative rotational force of hub, and 2 belt wheel sheets separate by the pressing force of taking turns band.Therefore, even the force application apparatus that 2 belt wheel sheets are separated is not set, 2 belt wheel sheets are separated.At this moment, for torque cam mechanism, cam pin is inserted logical cam path and is engaged with it, can the engagement release state, and it is mobile therefore can not rely on above-mentioned force application apparatus that 2 belt wheel sheets are separated.
According to this structure because force application apparatus is not set, so the components number of speed change belt wheel tail off, thereby can reduce manufacturing cost, and can make the miniaturization of speed change belt wheel.
Bicycle drive unit of the present invention has: driving pulley is connected with the S. A. of the pedal of bicycle; The wheel belt wheel is connected with the S. A. of the wheel of bicycle; The wheel band is suspended in described driving pulley and described wheel with on the belt wheel; And slack side tension holdout device, have tensioning pulley that partly contacts with described slack-side of taking turns band and the press device that this tensioning pulley is partly pushed to described slack-side of taking turns band, and be maintained the tension force of described slack-side part constant, it is characterized in that possessing the speed change belt wheel of each invention in above-mentioned 1 to 5 with belt wheel as described wheel.
In this bicycle drive unit, according to the pulling force of wheel band wheel is changed with the winding diameter of the wheel band on the belt wheel, when making driving pulley and wheel thus, the rotation of driving pulley is passed to the wheel belt wheel with the variation of the revolution ratio between the belt wheel.
In addition, when the winding diameter of the wheel band on the speed change belt wheel diminishes, the tension force of the slack-side part of wheel band diminishes, but this moment, tensioning pulley was by taking turns the press device of belt sag side tension force holdout device, press the slack-side part of pinch roller band, therefore can be maintained the slack-side tension force partly of wheel band constant.
In addition, wheel can make the separating distance of 2 belt wheel sheets successfully change with belt wheel, and therefore, bicycle drive unit can make driving pulley and wheel successfully change with the revolution ratio between the belt wheel.
Description of drawings
Fig. 1 is the partial side view of bicycle that is suitable for the bicycle drive unit of first embodiment of the present invention, and is the expression wheel is in the state of maximum with the winding diameter of the wheel band of belt wheel (speed change belt wheel) figure.
Fig. 2 is the birds-eye view of Fig. 1.
Fig. 3 is the III-III line cutaway view of Fig. 1.
Fig. 4 is the exploded perspective view of the wheel of first embodiment with belt wheel.
Fig. 5 is the enlarged drawing of the torque cam mechanism sheet among Fig. 4.
Fig. 6 is that the expression wheel is in the figure of minimum state with the winding diameter of the wheel band of belt wheel, and is the figure that is equivalent to Fig. 1.
Fig. 7 is the VII-VII line cutaway view of Fig. 6.
Fig. 8 is the cutaway view of the wheel that is used for bicycle drive unit of second embodiment of the present invention with belt wheel.
Fig. 9 is the cutaway view of the wheel that is used for bicycle drive unit of the 3rd embodiment of the present invention with belt wheel.
Nomenclature
1 bicycle
2 frameworks
3 pedals
The 3a S. A.
4 wheels
The 4a S. A.
5 bicycle drive units
6 driving pulleys
7 take turns band
10 wheels belt wheel (speed change belt wheel)
11 hubs
12,13 belt wheel sheets
14,15 torque cam mechanisms
16,18 even twisting moment cam bits
16a, 18a notch
17,19 movable torque cam mechanism sheets
17a, 19a jut
20,21 turned round coil spring (force application apparatus)
22,23 spring compressors
30 slack side tension setting devices
31 L font arms
32 tensioning pulleys
33 extension springs
110,210 wheels belt wheel (speed change belt wheel)
112,113 belt wheel sheets
114,115 torque cam mechanisms
116,118 even twisting moment cam bits
116a, 118a cam path
117,119 movable torque cam mechanism sheets
117a, 119a cam pin
The specific embodiment
First embodiment
Below, first embodiment of the present invention is described.
The bicycle drive unit 5 of present embodiment is applicable to bicycle 1.As Fig. 1 and shown in Figure 2, bicycle 1 has framework 2, pedal 3, wheel (trailing wheel) 4, the rotation of pedal 3 is passed to the bicycle drive unit 5 of wheel 4.The S. A. 3a (with reference to Fig. 2) of pedal 3 and the S. A. 4a (with reference to Fig. 2) of wheel 4 can be installed on the framework 2 respectively with rotating freely.
As shown in Figure 3, wheel is so-called V character wheel bands of the narrow more section V word shape of its width of part of inside more all sides with 7.
As Fig. 1 and shown in Figure 2, driving pulley 6 is fixed on the S. A. 3a of pedal 3, follows the rotation of pedal 3, and the direction of arrow in Fig. 1 is rotated.
Wheel is installed on the S. A. 4a of wheel 4 with belt wheel (speed change belt wheel) 10, and the arrow A direction in Fig. 1 is rotated.Wheel makes wheel with the variable speed change belt wheel of 7 winding diameter with belt wheel 10.As Fig. 3 and shown in Figure 4, wheel has 14,15,2 of 12,13,2 torque cam mechanisms of 11,2 belt wheel sheets of hub with belt wheel 10 and is turned round 20,21 and 2 spring compressors of coil spring (force application apparatus) 22,23.In addition, Fig. 3 and arrow A shown in Figure 4 are identical with the arrow A of Fig. 1, are the hand of rotation of wheel with belt wheel 10.
As Fig. 3 and shown in Figure 4, belt wheel sheet 12,13 forms on short barrel-contoured member the shape that cone shape annular component forms is installed.The outer peripheral face that belt wheel sheet 12,13 is installed as at hub 11 can slide on axial and circumferencial direction.Between belt wheel sheet 12,13 face in opposite directions, form the V groove, be with 7 at this V groove clamping wheel.By belt wheel sheet 12,13 being contacted in the axial direction or separating, the groove width of V groove is changed, thereby the winding diameter of taking turns with 7 is changed.
As shown in Figure 3,2 torque cam mechanisms 14,15 are configured in the axial both sides of belt wheel sheet 12,13, form symmetry on the left and right directions in Fig. 3.
As shown in Figure 5, torque cam mechanism 14 has roughly barrel-contoured even twisting moment cam bit 16 and the movable torque cam mechanism sheet of arranging in the axial direction 17.Even twisting moment cam bit 16 is fixed on the peripheral part of hub 11, and movable torque cam mechanism sheet 17 is fixed on belt wheel sheet 12.
On an axial end of even twisting moment cam bit 16, arrange in a circumferential direction and form 3 notch 16a.Notch 16a has edge part that extends and the edge part that extends in parallel in the axial direction on hand of spiral.This hand of spiral is a direction of using the axial centre of belt wheel 10 more towards the arrow A direction more near wheel.On an axial end of movable torque cam mechanism sheet 17, arrange 3 jut 17a that form to axially outstanding in a circumferential direction.Jut 17a forms the shape that engages with notch 16a.Jut 17a can slide along the edge part that extends on the hand of spiral of notch 16a, and thus, movable torque cam mechanism sheet 17 can engage with even twisting moment cam bit 16 on hand of spiral movably with respect to even twisting moment cam bit 16.
By even twisting moment cam bit 16 is engaged with movable torque cam mechanism sheet 17, can make the rotational force of belt wheel sheet 12 be passed to hub 11 via torque cam mechanism 14.
In addition, movable torque cam mechanism sheet 17 and even twisting moment cam bit 16 engage on hand of spiral movably, when belt wheel sheet 12 rotates on the arrow A direction relatively with respect to hub 11, power on the part of this rotational force is transformed to axially by torque cam mechanism 14, belt wheel sheet 12 moves to the direction near belt wheel sheet 13.
In addition, torque cam mechanism 15 is made of even twisting moment cam bit 18 and movable torque cam mechanism sheet 19.Form symmetry on torque cam mechanism 15 and the left and right directions of torque cam mechanism 14 in Fig. 3, therefore the explanation of omitting torque cam mechanism 15.
As Fig. 3 and shown in Figure 4, symmetry on the left and right directions that 2 spring compressors 22,23 form in Fig. 3. Spring compressor 22,23 has tin 22a of portion, a 23a and side wall portion 22b, the 23b of the ring-type of extending from the inside all side of the end radius vector of the 22a of this, 23a.Side wall portion 22b, the 23b of spring compressor 22,23 is separately fixed at even twisting moment cam bit 16,18 by not shown transom.
Turned round symmetry on the left and right directions that coil spring (force application apparatus) 20,21 forms in Fig. 3 for 2.Below, illustrate and turned round coil spring 20, omit the explanation of being turned round coil spring 21.
Turned round the space between the outer peripheral face that coil spring 20 is configured in the inner peripheral surface of the 22a of tube portion of spring compressor 22 and torque cam mechanism 14.Turned round under the state that coil spring 20 is stretched in a circumferential direction, an end being turned round coil spring 20 is to the radial outside bending, be fixed on the belt wheel sheet 12 by not shown connecting element, in addition, the other end is fixed on the even twisting moment cam bit 16 by not shown connecting element to radially inner side bending (with reference to Fig. 4).Thus, belt wheel sheet 12 and be fixed on this belt wheel sheet 12 movable torque cam mechanism sheet 17 by turned round coil spring 20 be applied in respect to even twisting moment cam bit 16 (to hub 11) towards with arrow A side's power in the opposite direction.Power on the application force of its circumferencial direction is transformed to axially by even twisting moment cam bit 16 and movable torque cam mechanism sheet 17, thus, belt wheel sheet 12 is applied in power on the direction that 2 belt wheel sheets 12,13 separate in the axial direction by turning round coil spring 20.
Use in the belt wheel 10 at this wheel, under the wheel situation little, as Fig. 6 and shown in Figure 7 with 7 pulling force (in detail, take turns rotational force) with the part of 7 belt wheel sheet 12,13 maintenances, owing to turned round the application force of coil spring 20,21, separated in the time of 12,13 rotations of belt wheel sheet.Therefore, wheel diminishes with 7 winding diameter with the wheel of belt wheel 10.
Under the wheel situation big with 7 pulling force, with 7 pulling force, belt wheel sheet 12,13 relatively rotates with respect to hub 11 by wheel.Power on the part of this rotational force is transformed to axially by torque cam mechanism 14,15, thus as Fig. 1 and shown in Figure 3, belt wheel sheet 12,13 overcomes the application force of being turned round coil spring 20,21 and approaching.Therefore, wheel becomes big with the wheel of belt wheel 10 with 7 winding diameter.
As shown in Figure 1, slack side tension holdout device 30 is made of L font arm 31, tensioning pulley 32, extension spring (press device) 33.Slack side tension holdout device 30 is used for remaining constant with the tension force of 7 slack-side part wheel.In addition, wheel partly is meant owing to the rotation of driving pulley 6 is taken turns with 7 lax sides with 7 slack-side, that is, compares the part of being with the downstream of sense of motion at wheel with driving pulley 6.In addition, in Fig. 2, omitted the expression of tensioning pulley 32 and extension spring 33.
The central part (curve) of L font arm 31 is installed on the S. A. 3a of pedal 3 swingably.
In this slack side tension holdout device 30, when wheel diminishes with the tension force of 7 slack-side part, application force by extension spring 33, tensioning pulley 32 is the center swing with the Shaft heart of the S. A. 3a of pedal 3, and the direction that wheel is pushed expansion to tensioning pulley 32 to outer circumferential side with 7 slack-side part is pushed.Thus, the slack-side tension force partly of taking turns with 7 becomes big.Therefore, can be maintained constant with the tension force of 7 slack-side part wheel.
The action of bicycle drive unit 5 then, is described.
The rotation that bicycle drive unit 5 makes driving pulley 6 via wheel be with 7 and wheel be passed to wheel 4 with belt wheel 10, at this moment, according to wheel with 7 pulling force change wheel with the wheel on the belt wheel 10 with 7 winding diameter, can change the revolution ratio (converter speed ratio) between driving pulley 6 and the wheel usefulness belt wheel 10 thus.Below, specifically describe.
At bicycle 1 under the situation of travelling on descending or the flat road surface, wheel uses the pulling force of the part on the belt wheel 10 little with 7 the wheel that is suspended in, therefore, as Fig. 6 and shown in Figure 7,2 belt wheel sheets 12,13 are owing to the application force of being turned round coil spring 20,21 separates, thereby wheel diminishes with 7 winding diameter with the wheel on the belt wheel 10.
Therefore, big with the rotation amount of belt wheel 10 when on descending or flat road surface, travelling with respect to the wheel of the rotation amount of driving pulley 6, thus can reduce the rotation amount of pedal 3.
On the other hand, when on bicycle 1 is going up a slope, travelling, wheel uses the pulling force of the part on the belt wheel 10 big with 7 the wheel that is suspended in, therefore as Fig. 1 and shown in Figure 3, because wheel is with 7 pulling force, belt wheel sheet 12,13 overcomes the application force of being turned round coil spring 20,21 and approaching, thereby wheel becomes big with the wheel on the belt wheel 10 with 7 winding diameter.
Therefore, the wheel with respect to the rotation amount of driving pulley 6 is little with the rotation amount of belt wheel 10.When up-hill journey, the resistance to motion of wheel 4 is big, therefore needs big power in order to make pedal 3 rotations, but as mentioned above, because the wheel with respect to the rotation amount of driving pulley 6 is little with the rotation amount of belt wheel 10, be used to make the needed power of pedal 3 rotations so can alleviate.
In addition, when wheel diminished with 7 winding diameter with the wheel on the belt wheel 10, wheel diminished with the tension force of 7 slack-side part.At this moment, by the application force of extension spring 33, tensioning pulley 32 is partly pushed with 7 slack-side to wheel, thereby can be maintained constant with the tension force of 7 slack-side part wheel.
As mentioned above, for wheel belt wheel 10, when the separating distance that makes 2 belt wheel sheets 12,13 changes, 2 belt wheel sheets 12,13 rotate relatively with respect to hub 11 together, compare with such in the past situation that only makes a belt wheel sheet rotation in 2 belt wheel sheets, the separating distance of 2 belt wheel sheets 12,13 is successfully changed.Therefore, bicycle drive unit 5 can make driving pulley 6 and wheel successfully change with the revolution ratio between the belt wheel 10.
In addition, torque cam mechanism sheet the 16,17,18, the 19th is formed with the cylindrical body of notch or jut in the end, owing to be simple shape, is easy to make.
In addition, constitute the axial end portion engaging of 2 torque cam mechanism sheets 16,17 (18,19) of 1 torque cam mechanism 14 (15), 2 torque cam mechanism sheets area of contact each other is big, therefore, can on the part of torque cam mechanism sheet 16,17 (18,19), not act on big power, thereby be difficult to produce distortion and damaged.Therefore, the contact of 2 belt wheel sheets 12,13 is carried out smoothly with separating for a long time.
In addition, though it is relevant with the angle of the hand of spiral of the edge part of the notch 16a (18a) of even twisting moment cam bit 16 (18), but with only make belt wheel sheet 12 (13) and compare to the extension coil spring that moves axially identical distance, turned round the number that turns around that coil spring 20 (21) can reduce spring coil, therefore can be shortened axial length.Therefore, can make wheel belt wheel 10 miniaturizations.
In addition, the torque cam mechanism 14 of present embodiment forms notch 16a on even twisting moment cam bit 16, on movable torque cam mechanism sheet 17 jut 17a is set, but, on the contrary, also can on even twisting moment cam bit 16, form jut, on movable torque cam mechanism sheet 17, form notch.Torque cam mechanism 15 is also identical.
In addition, the number that is arranged on notch 16a, 18a (jut 17a, 19a) on 1 torque cam mechanism 14,15 is not limited to 3.Wherein, under notch 16a is situation below 2, be difficult to make movable torque cam mechanism sheet 17 stably to slide along notch 16a, therefore preferred more than 3.
In addition, the shape of notch 16a, 18a is not limited to Fig. 4 and shape shown in Figure 5 so long as have more towards the arrow A direction more to the shape of wheel with the edge part on the approaching hand of spiral of the axial centre of belt wheel 10.The edge part that extends on hand of spiral by changing notch 16a, 18a can change the speed that revolution ratio is changed with respect to axial angle of inclination.
Second embodiment
Then, second embodiment of the present invention is described.Wherein, for the identical structure of described first embodiment, mark identical mark, suitably omit its explanation.The wheel of the bicycle drive unit of present embodiment is different with first embodiment with the structure of belt wheel (speed change belt wheel), and other structures are identical with described first embodiment.
As shown in Figure 8, the wheel of present embodiment has 114,115,2 of 112,113,2 torque cam mechanisms of 11,2 belt wheel sheets of hub with belt wheel 110 and is turned round 20,21,2 spring compressors of coil spring (force application apparatus) 22,23.
2 belt wheel sheets 112,113 are formed by cone shape annular component respectively, are being installed in movably on the hub 11 on axial and the circumferencial direction via torque cam mechanism sheet 117,119 described later.
2 torque cam mechanisms 114,115 are configured in the axial both sides of belt wheel sheet 112,113, form symmetry on the left and right directions in Fig. 8.
On even twisting moment cam bit 116, arrangement in a circumferential direction is formed with a plurality of cam path 116a that extend on hand of spiral.This hand of spiral is a direction of using the axial centre of belt wheel 110 more towards the arrow A direction more near wheel.At the outer peripheral face of movable torque cam mechanism sheet 117, arrangement in a circumferential direction is formed with outstanding diametrically a plurality of cam pin 117a.Cam pin 117a inserts in the logical cam path 116a, can move along cam path 116a.By this cam path 116a and cam pin 117a, 2 torque cam mechanism sheets 116,117 can engage on hand of spiral movably.
By making even twisting moment cam bit 116 and 117 engagings of movable torque cam mechanism sheet, can make the rotational force of belt wheel sheet 12 be passed to hub 11 via torque cam mechanism 14.
In addition, because movable torque cam mechanism sheet 117 can engage on hand of spiral movably with even twisting moment cam bit 116, so belt wheel sheet 112 with respect to hub 11 when the arrow A direction is rotated, the part of its rotational force is transformed to axial power by torque cam mechanism 114, and belt wheel sheet 112 moves to the direction near belt wheel sheet 113.
In addition, torque cam mechanism 115 is formed by even twisting moment cam bit 118 and movable torque cam mechanism sheet 119.Form symmetry on torque cam mechanism 115 and the left and right directions of torque cam mechanism 114 in Fig. 8, therefore, omit the explanation of torque cam mechanism 115.
With in the belt wheel 110, under the wheel situation little, belt wheel sheet 112,113 is separated at this wheel by the application force of being turned round coil spring 20,21 with 7 pulling force.Therefore, wheel diminishes with 7 winding diameter with the wheel on the belt wheel 110.
Under the wheel situation big with 7 pulling force, belt wheel sheet 112,113 rotates with respect to hub 11 with 7 pulling force relatively by wheel.The part of its rotational force is transformed to axial power by torque cam mechanism 114,115, and thus, as shown in Figure 8, belt wheel sheet 112,113 overcomes the application force of being turned round coil spring 20,21 and be approaching.Therefore, wheel becomes big with the wheel on the belt wheel 110 with 7 winding diameter.
When wheel makes the separating distance of 2 belt wheel sheets 112,113 change with belt wheel 110 in this wise, 2 belt wheel sheets 112,13 rotate relatively with respect to hub 11 together, therefore, compare with the situation that only made a belt wheel sheet rotation in 2 belt wheel sheets like that in the past, the separating distance of 2 belt wheel sheets 112,113 is successfully changed.Therefore, the bicycle drive unit of present embodiment can make driving pulley 6 and wheel change smoothly with the revolution ratio between the belt wheel 110.
In addition, cam pin 117a (119a) inserts in the cam path 116a (118a), only can move in cam path 116a (118a), and therefore, 2 torque cam mechanism sheets 116,117 (118,119) can the engagement release state, and keeps fastening state all the time.Therefore, can stably make 112,113 contacts of 2 belt wheel sheets and separate.
In addition, the torque cam mechanism 114 of present embodiment forms cam path 116a on even twisting moment cam bit 116, at movable torque cam mechanism sheet 117 cam pin 117a is set, but, on the contrary, also can on even twisting moment cam bit 116, cam pin be set, form cam path at movable torque cam mechanism sheet 117.
The 3rd embodiment
Then, the 3rd embodiment of the present invention is described.Wherein, for described first embodiment or the identical structure of second embodiment, mark identical mark, suitably omit its explanation.The wheel of the bicycle drive unit of present embodiment is different with first embodiment with the structure of belt wheel (speed change belt wheel), and other structures are identical with described first embodiment.
As shown in Figure 9, the wheel of present embodiment is made of 112,113,2 torque cam mechanisms 114,115 of 11,2 belt wheel sheets of hub with belt wheel 210.Wheel is not provided with 2 with belt wheel 210 and is turned round 20,21 and 2 spring compressors 22,23 of coil spring, and in addition the wheel with described second embodiment is identical with the structure of belt wheel 110.
Use in the belt wheel 10 at this wheel, under the wheel situation little with 7 pulling force, relative rotational force with respect to the hub 11 of belt wheel sheet 112,113 diminishes, and belt wheel sheet 12,13 separates with 7 pressing force (that is, wheel will be pushed the power of expansion with 7 between movable pulley sheet and the fixed pulley sheet) because of wheel.Therefore, even the wheel of present embodiment is not provided with the force application apparatus that 2 belt wheel sheets 112,113 are separated with belt wheel 210,2 belt wheel sheets 112,113 are separated.
At this moment, for torque cam mechanism 114,115, cam pin 117a, 119a insert logical cam path 116a, 118a and engage, because torque cam mechanism 14,15 as first embodiment, can the engagement release state, do not move so can 2 belt wheel sheets be separated by above-mentioned force application apparatus.
On the other hand, under the wheel situation big with 7 pulling force, belt wheel sheet 112,113 rotates with respect to hub 11 with 7 pulling force relatively by wheel.Power on the part of its rotational force is transformed to axially by torque cam mechanism 114,115, thus as shown in Figure 9, belt wheel sheet 112,113 is approaching.
, not have the force application apparatus that makes 112,113 separation of 2 belt wheel sheets is set with in the belt wheel 210 at the wheel of present embodiment, so wheel tails off with the components number of belt wheel 210, thereby can reduce manufacturing cost.In addition, can make wheel belt wheel 210 miniaturizations.
More than, as preferred embodiment of the present invention, first to the 3rd embodiment has been described, but above-mentioned embodiment can followingly change enforcement.
(1) in described first to the 3rd embodiment, it is constant belt wheel that driving pulley 6 uses the winding diameter of taking turns with 7, but also can use wheel with the variable belt wheel of 7 winding diameter.
(2) as long as the even twisting moment cam bit that is fixed on the hub 11 engages on hand of spiral movably with the movable torque cam mechanism sheet that is fixed on the belt wheel sheet, be not limited to the described shape of described first to the 3rd embodiment.
(3) in first to the 3rd embodiment, as on the direction of separating at 2 belt wheel sheets 12,13 (112,113) to the force application apparatus of the belt wheel sheet application of force, uses and turned round coil spring, but force application apparatus is not limited thereto.For example, can be extension coil spring, also can be leaf spring.
Claims (6)
1. speed change belt wheel is characterized in that having:
Barrel-contoured hub is connected with S. A.;
2 belt wheel sheets can be slidingly arranged in the peripheral part of described hub respectively on axial and circumferencial direction, and are formed for the V groove of the wheel band of clamping section V word shape between mutual face in opposite directions;
2 torque cam mechanisms are formed by 2 torque cam mechanism sheets respectively, and are separately positioned on described 2 belt wheel sheets, and wherein, described 2 torque cam mechanism sheets can engage on hand of spiral movably, and are separately fixed on described hub and the described belt wheel sheet;
2 force application apparatus, the direction of separating to described 2 belt wheel sheets are to the described belt wheel sheet application of force, and are separately positioned on described 2 belt wheel sheets.
2. speed change belt wheel according to claim 1 is characterized in that,
Described 2 belt wheel sheets are alignment arrangements 2 cylindrical body in the axial direction,
The axial end portion of a cylindrical body in described 2 cylindrical body is formed with notch, and described notch has the edge part that extends at hand of spiral,
Axial end portion in another cylindrical body is formed with jut, and described jut is outstanding in the axial direction, can engage with described notch slidably on hand of spiral with respect to described notch.
3. speed change belt wheel according to claim 1 is characterized in that,
A torque cam mechanism sheet in described 2 torque cam mechanism sheets is the cylindrical body that is formed with the cam path that extends at hand of spiral,
Another torque cam mechanism sheet has cam pin, and described cam pin inserts in the described cam path, can move along described cam path.
4. according to claim 2 or 3 described speed change belt wheels, it is characterized in that,
Described force application apparatus is that the described belt wheel sheet application of force is made the turned round coil spring of described belt wheel sheet with respect to described hub rotation.
5. speed change belt wheel according to claim 3 is characterized in that, does not have described 2 force application apparatus.
6. bicycle drive unit has:
Driving pulley is connected with the S. A. of the pedal of bicycle;
The wheel belt wheel is connected with the S. A. of the wheel of bicycle;
The wheel band is suspended in described driving pulley and described wheel with on the belt wheel; And
The slack side tension holdout device has tensioning pulley that partly contacts with described slack-side of taking turns band and the press device that this tensioning pulley is partly pushed to described slack-side of taking turns band, and the tension force of described slack-side part is maintained constant, it is characterized in that,
Possesses the speed change belt wheel described in the claim 1 as described wheel with belt wheel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009224491A JP5531533B2 (en) | 2009-09-29 | 2009-09-29 | Speed change pulley and bicycle drive device using the same |
| JP2009-224491 | 2009-09-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102030072A true CN102030072A (en) | 2011-04-27 |
| CN102030072B CN102030072B (en) | 2013-03-13 |
Family
ID=43883642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010297287 Expired - Fee Related CN102030072B (en) | 2009-09-29 | 2010-09-28 | Variable speed pulley and bicycle driving device with the same |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5531533B2 (en) |
| CN (1) | CN102030072B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109076795A (en) * | 2018-01-19 | 2018-12-25 | 江苏沃得农业机械有限公司 | Harvester centrifugal fan electric speed regulation mechanism |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101331716B1 (en) * | 2013-02-04 | 2013-11-20 | 안영미 | Continuosly variable transmission |
| KR101792920B1 (en) * | 2015-12-21 | 2017-11-20 | 동양물산기업 주식회사 | Device for adjusting rotation speed of rake reel for combine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5061224A (en) * | 1990-08-20 | 1991-10-29 | Stuhler William B | Variable speed bicycle automatic torque converter transmission |
| CN2276898Y (en) * | 1996-07-02 | 1998-03-25 | 林松义 | Farm motor-driving transport vehicle |
| JPH10318342A (en) * | 1997-05-15 | 1998-12-04 | Honda Motor Co Ltd | V-belt automatic transmission |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5635853A (en) * | 1979-08-28 | 1981-04-08 | Nippon Denso Co Ltd | Power transmission system |
| JPS6171288A (en) * | 1984-09-13 | 1986-04-12 | 渡辺機開工業株式会社 | Variable speed gearing for bicycle |
| JP2767589B2 (en) * | 1988-05-10 | 1998-06-18 | ヤマハ発動機株式会社 | V-belt continuously variable transmission |
| JPH03114491U (en) * | 1990-03-09 | 1991-11-25 | ||
| JPH0560192A (en) * | 1991-08-27 | 1993-03-09 | Suzuki Motor Corp | Driven v-pulley of v-belt automatic transmission |
| JP2001355712A (en) * | 2000-06-12 | 2001-12-26 | Yaskawa Electric Corp | Pulley of variable diameter and continuously variable transmission having the same |
| JP2009250337A (en) * | 2008-04-04 | 2009-10-29 | Yamada Seisakusho Co Ltd | Driven pulley of v-belt automatic transmission device |
-
2009
- 2009-09-29 JP JP2009224491A patent/JP5531533B2/en not_active Expired - Fee Related
-
2010
- 2010-09-28 CN CN 201010297287 patent/CN102030072B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5061224A (en) * | 1990-08-20 | 1991-10-29 | Stuhler William B | Variable speed bicycle automatic torque converter transmission |
| CN2276898Y (en) * | 1996-07-02 | 1998-03-25 | 林松义 | Farm motor-driving transport vehicle |
| JPH10318342A (en) * | 1997-05-15 | 1998-12-04 | Honda Motor Co Ltd | V-belt automatic transmission |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109076795A (en) * | 2018-01-19 | 2018-12-25 | 江苏沃得农业机械有限公司 | Harvester centrifugal fan electric speed regulation mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5531533B2 (en) | 2014-06-25 |
| CN102030072B (en) | 2013-03-13 |
| JP2011073488A (en) | 2011-04-14 |
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