CN2535603Y

CN2535603Y - Over-running clutch

Info

Publication number: CN2535603Y
Application number: CN 01247962
Authority: CN
Inventors: 徐模宏
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-10-25
Filing date: 2001-10-25
Publication date: 2003-02-12
Anticipated expiration: 2011-10-25

Abstract

The utility model provides an overrunning clutch which relates to an overrunning clutch in mechanical drive, particularly an overrunning clutch with a driven wheel capable of reversely rotating. The aim of the utility model is to solve the problem that the driven wheel of the existing overrunning clutch can not reversely rotate. The overrunning clutch comprises a fixed central shaft (1), and an inner ratchet wheel (6) and a ratchet pawl wheel (9) which are arranged on the central shaft (1) and are respectively connected with a driving wheel (7) and a driven wheel (8), a ratchet pawl (11) which is arranged on the circumference of the ratchet pawl wheel and is engaged with the inner ratchet wheel, and a spring (12) engaged with the ratchet pawl, wherein a slide ring (20) is arranged on the periphery of the ratchet pawl wheel on which a shifting fork (13) is arranged, the shifting fork is in one-way engagement with a fixed gear (3) on the central shaft and is matched with a shifting fork port (22) on the slide ring, and a ratchet pawl port (21) on the slide ring is matched with the ratchet pawl. The overrunning clutch is especially suitable for assembling with a reciprocating foot pedal driving type bicycle.

Description

Free wheel device

Technical field

The utility model relates to the reversible free wheel device of the free wheel device in the mechanical transmission, particularly follower.

Background technique

Existing free wheel device, the flywheel of bicycle for example, usually by fixing central shaft, and the pawl wheel of going up the rotating internal clickwork that links to each other with the driving wheel of sprocket-type, linking to each other with the follower of wheel formula, pawl wheel week is along last ratchet that can be meshed with internal clickwork and ratchet engage spring thereof.With the supporting use of bicycle the time, driving wheel is that sprocket wheel and bicycle driving chain are joined even, and follower is a wheel.This free wheel device is when driving wheel input rotating power, and internal clickwork rotates, and ratchet is meshed with internal clickwork, drives pawl wheel and rotates outputting rotary power together with follower.When driving wheel stopped operating together with internal clickwork when importing power interruption, ratchet and internal clickwork were removed engagement, and follower surmounts driving wheel together with wheel and continues rotating operation under the effect of rotatory inertia, thereby bicycle moves under the effect of car load inertial force.But, this free wheel device falls back and wheel when reversing together with follower at bicycle, because the engagement of internal clickwork and ratchet, and make driving wheel be driven counter-rotating, cause the counter-rotating of chain and driving mechanism thereof and can not backward, therefore, there is the problem that follower can not counterrotating in this free wheel device.

The model utility content

Given this, but the purpose of this utility model is to provide a kind of free wheel device of follower counterrotating.

The utility model adopts the trip ring that matches with ratchet at pawl wheel periphery suit, on pawl wheel, adopt with central shaft on fixing tooth match and stir trip ring pushing ratchet when being incorporated in the pawl wheel counterrotating and pawl wheel freely be reversed together with the follower energy realize its purpose to removing engagement with internal clickwork.

Free wheel device of the present utility model (referring to accompanying drawing), comprise fixing central shaft (1) and go up internal clickwork (6) that links to each other with driving wheel (7) and the pawl wheel (9) that links to each other with follower (8), ratchet that is meshed with internal clickwork (11) on the pawl wheel periphery and ratchet engage spring (12) thereof, the periphery of pawl wheel has trip ring (20), shift fork (13) is arranged on the pawl wheel, shift fork and fixed gear (3) on the central shaft are one way engagement and cooperate pawl slot (21) and click-fit on trip encircles with shift fork mouth (22) on the trip ring.

Above-mentioned shift fork (13) pawl wheel (9) go up and with declutch shift shaft (16) that central shaft (1) parallels on, the pointed tooth of shift fork (14) is meshed with fixed gear (3), the driving lever of shift fork (15) is in shift fork mouth (22), and the shift fork spring (18) of annular that is wire is in the annular groove (19) of the spring groove (17) of at grade shift fork and pawl wheel (9) periphery.

Above-mentioned driving wheel (7), internal clickwork (6), follower (8), pawl wheel (9) are installed on the central shaft (1) with cup and bearing guard (4), steel ball (5).

When the utility model was fitted on work body such as the bicycle, the wheel that central shaft is installed with bicycle was stuck, and driven crop rotation wheel hub is made wheel, driving wheel is made sprocket wheel link to each other through Transmitted chains and power mechanism such as pedal or motor.Under the driving of power mechanism, the driving wheel rotation, through internal clickwork, ratchet, pawl wheel, the rotation of driven transmission wheel drives bicycle and advances; When bicycle retreats and wheel is follower when counter-rotating, shift fork on the pawl wheel is stirred relatively by the fixing tooth on the central shaft, shift fork promotes trip ring backward rotation, trip ring pushing ratchet is to the engagement of removing ratchet and internal clickwork, pawl wheel can freely be reversed together with follower, realize that bicycle retreats reversing.

Trip ring of the present utility model, shift fork, fixing tooth structure, can when follower reverses, remove the engagement of ratchet and internal clickwork, disconnect being in transmission connection of follower and driving wheel, make the follower counterrotating unfettered, thereby have the advantage that follower can freely reverse.

The utility model is specially adapted to and the supporting use of bicycle.

Below, the utility model is further described to use embodiment and accompanying drawing thereof again.

Description of drawings

Fig. 1 is the structural representation of a kind of free wheel device of the present utility model.

Fig. 2 is the A-A sectional view of Fig. 1.

Embodiment

Embodiment 1

A kind of free wheel device of the present utility model, as shown in drawings.Its structure is similar with the flywheel of common bicycle.Use with bicycle is equipped.Constitute by central shaft, driving wheel, internal clickwork, pawl wheel, follower, shift fork, You Huan etc.

Above-mentioned central shaft 1, cylindrical referring to Fig. 1, be used to be packed in the wheel fork (not shown) of bicycle.Be fixed with the central gear 2 that is multidiameter shaft shape with screw thread on the central shaft.The center section part of central gear is made fixed gear 3.Be respectively with three cover cups and bearing guard 4, steel ball 5 at the center section part of central gear and two end part and be fitted with internal clickwork and follower rotationally.

Above-mentioned internal clickwork 6 referring to Fig. 1 and Fig. 2, is ladder tube axle shape.Interior week be shaped on ratchet in larger diameter end.Periphery in smaller diameter end is fixed with driving wheel 7, and driving wheel adopts the sprocket wheel of common structure, and is supporting with the Transmitted chains of bicycle.

Above-mentioned follower 8 referring to Fig. 1, is ladder tube axle shape, can be fixed with the columnar driven shaft 23 that is nested with on central shaft 1.The larger diameter end of follower is made wheel hub, constitutes the wheel (not shown) with spoke and wheel rim.

Above-mentioned pawl wheel 9, referring to Fig. 1 and Fig. 2, the pawl wheel of structure and bicycle freewheel is similar, is the cascade ring dish type, is packed in the smaller diameter end periphery of trailing wheel driving wheel 8 and extends in the annular chamber that is nested with between above-mentioned internal clickwork 6 and fixed gear 3 to fixed gear side.Be shaped on the pawl base 10 of one or two breach shape on the outer periphery of the larger diameter end of pawl wheel, be equipped with the ratchet 11 and the ratchet engage spring 12 thereof of the arc strip structure that is common in the pawl base.Under the tension force effect of ratchet engage spring, the lateral part of ratchet 11 and internal clickwork 6 are normal engagement.Be fixed with shelves ring 24 in the outside of pawl wheel larger diameter end, deviate from order to hurdle retaining ratchet is unlikely.The through hole 25 that deltiod is radially arranged in the torus of pawl wheel smaller diameter end.

Above-mentioned shift fork 13 referring to Fig. 1 and Fig. 2, is made plate-like prismatic, or makes other geometrical shapies.The shift fork front end is a pointed tooth 14, and there is driving lever 15 at the rear portion, and the axis hole at middle part and declutch shift shaft 16 are movingly, and declutch shift shaft is parallel to central shaft 1 and is packed on the pawl wheel 9 of through hole 23 both sides, thereby shift fork is in the through hole 23 that is fitted in pawl wheel rotationally.The plate central part at the rear portion of shift fork is opened and is shaped on the spring groove 17 perpendicular with declutch shift shaft.The shift fork spring 18 that is the ring of wire is fitted in the spring groove, and place pawl wheel 9 periphery annular groove 19 and obtain supporting, spring groove 17 and annular groove 19 are all on the same plane perpendicular to central shaft 1.Under the effect of shift fork spring, the pointed tooth 14 and the fixed gear 3 of shift fork front end are normal engagement.The shift fork spring also can be made other common spring structures.

Above-mentioned trip ring 20 referring to Fig. 1 and Fig. 2, is ring, is sleeved on the periphery of pawl wheel 9 rotationally, and places the inner chamber of internal clickwork 6., open the pawl slot 21 that is shaped on breach shape, and open the shift fork mouth 22 that is shaped on breakthrough form one by one corresponding to each ratchet in a side of swimming ring.When equipped, the inside portion of above-mentioned ratchet 11 should be able to be snapped in and in the breach of pawl slot it is stretched out with internal clickwork 6 from pawl slot 21 to be meshed, the driving lever 15 of shift fork 13 is inserted in the shift fork mouths 22, make the pointed tooth 14 of shift fork be unidirectional normal engagement with fixed gear 3.

The utility model is fitted in (not shown) on the bicycle, when 7 clockwise directions of Transmitted chains transmission driving wheel are rotated, as shown in Figure 2, ratchet 11 on the pawl wheel 9 stretches out with internal clickwork 6 from the pawl slot 21 of trip ring 20 and is meshed, promoting pawl wheel through ratchet turns clockwise, the follower 8 that is connected with pawl wheel turns clockwise, and drives bicycle and advances, and this moment, the pointed tooth 14 of shift fork 13 slipped over from 3 of fixed gears.When bicycle falls back backward, follower 8 oppositely is rotated counterclockwise together with pawl wheel 9, the pointed tooth 14 of shift fork 13 and fixed gear 3 engagements, shift fork rotates counterclockwise, the promotion of the driving lever 15 of shift fork mouth 22 through inserting trip ring 20, trip ring 20 rotates counterclockwise, ratchet 11 on the pawl slot 21 pushing pawl wheels 9 of trip ring, overcome the tension force of ratchet engage spring 12, the ratchet pushing is entered pawl base 10,, disconnect being in transmission connection of driving wheel 7 and follower 8 until removing the engagement of ratchet 11 with internal clickwork 6, pawl wheel 9 is realized falling back of bicycle together with follower 8 counterrotating that gains freedom.

Present embodiment is specially adapted to use with reciprocating pedal plate driven bicycle is equipped.

Claims

1, a kind of free wheel device, comprise fixing central shaft (1) and go up internal clickwork (6) that links to each other with driving wheel (7) and the pawl wheel (9) that links to each other with follower (8), ratchet that is meshed with internal clickwork (11) on the pawl wheel periphery and ratchet engage spring (12) thereof, the periphery that it is characterized in that pawl wheel has trip ring (20), shift fork (13) is arranged on the pawl wheel, shift fork and fixed gear (3) on the central shaft are one way engagement and cooperate pawl slot (21) and click-fit on trip encircles with shift fork mouth (22) on the trip ring.

2, free wheel device according to claim 1, it is characterized in that said shift fork (13) pawl wheel (9) go up and with declutch shift shaft (16) that central shaft (1) parallels on, the pointed tooth of shift fork (14) is meshed with fixed gear (3), the driving lever of shift fork (15) is in the annular groove (19) of the spring groove (17) of shift fork spring (18) shift fork at grade of annular of wire and pawl wheel (9) periphery in shift fork mouth (22).

3, free wheel device according to claim 1 and 2 is characterized in that said driving wheel (7), internal clickwork (6), follower (8), pawl wheel (9) are installed on the central shaft (1) with cup and bearing guard (4), steel ball (5).