KR20150137873A - A Transmission apparatus of Bicycle - Google Patents

Abstract

A hollow connecting shaft provided so as to penetrate through the hollow of the hub shaft unit to which the wheels of the bicycle are coupled and which is rotatably engaged with the hub shaft unit, and a connecting shaft provided at one end of the connecting shaft, A restraining unit for selectively restraining and releasing the other end of the connecting shaft relative to the hub shaft unit and rotating integrally with the restraining unit, And a control unit for freely rotating the connecting shaft with respect to the hub axis unit.

Description

Description of the Related Art [0002] A Transmission apparatus of Bicycle [

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bicycle transmission, and more particularly, to a bicycle transmission capable of shifting a bicycle even in a stationary state.

BACKGROUND OF THE INVENTION [0002] Generally, a gear transmission of a bicycle is installed in order to allow a pedal to be stepped on with a constant force and speed according to a running state, in which sprockets having different numbers of teeth on a pedal and a rear wheel axis are arranged in a superposed manner.

The gearbox of these bicycles is designed so that the bicycle chain is hung on a small sprocket on the pedal shaft, the large sprocket on the rear axle, and the bicycle chain is attached to the large sprocket on the pedal shaft and the small sprocket on the rear wheel shaft. So that the bicycle can be kept in the running state even if the pedal is stepped on at a constant force and speed. An example of this is disclosed in the prior art (Registration Utility Model No. 20-0274726, automatic transmission for bicycle).

However, in the conventional gear transmission of a bicycle as disclosed in the above prior art, the shift can be adjusted only while the bicycle is stepped on by stepping on the pedal, and there is a limit in which the gear can be shifted only when the pedal is stepped in the direction in which the bicycle advances.

In other words, even when the vehicle is traveling on a flat ground without accelerating the vehicle without lowering the slope without stepping on the pedal or by stepping on the pedal, the vehicle can be shifted only when the pedal is stepped on to transmit the rotational force to the bicycle wheel.

Further, according to the related art, there is a problem that the bicycle gear change can not be performed in a state where the bicycle is stopped.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a control apparatus for a bicycle transmission that is improved in structure so as to be capable of shifting gears by preventing transmission of a pressing force of a pedal from a bicycle to a bicycle in a stationary state .

In order to achieve the above object, a bicycle transmission according to the present invention includes: a hollow connecting shaft installed to penetrate through a hollow of a hub shaft unit to which a wheel of a bicycle is coupled and rotatably coupled to the hub shaft unit; A sprocket unit installed at one end of the connecting shaft and transmitting rotational force to the connecting shaft in the bicycle traveling direction and freely rotating with respect to the connecting shaft in the opposite direction; A restraining unit that selectively restrains and releases the other end of the connecting shaft with respect to the hub shaft unit and rotates integrally when restrained; And a control unit selectively releasing the restricting state of the restricting unit to allow the connection shaft to freely rotate with respect to the hub axis unit.

Here, the hub shaft unit includes a center wheel coupling unit, which is coupled to the outer periphery of the bicycle wheel, has a hollow opening at both ends, and is coupled to the wheel; And a latch support flange connected to one side of the wheel coupling part and connected to the control unit, the constraining latch of the restraint unit being supported, and the control unit being coupled to the latch support flange, It is preferable that a latch through hole is formed which is rotatably received.

In addition, the restraint unit may include an interference part provided on the outer periphery of the other end of the connection shaft; And a constraining latch installed in the latch through-hole of the latch support flange so as to selectively interfere with the interference portion.

The control unit may further include: a latch interference drum coupled to the outside of the latch support flange and rotated together with a rotation gap with the latch support flange, the latch interference drum being connected to the constraint latch to control the turning operation of the constraint latch; A drum control unit selectively providing a load to the latch interference drum; And a return spring for returning to the home position when the load is released, in a state where the latch interfering drum is relatively rotated with respect to the latch supporting flange by the rotation clearance when a load is applied from the drum control unit to the latch interference drum And the constraining latch has a protrusion protruding outside the latch support flange and connected to the latch interference drum to be driven.

It is also preferable that the latch interference drum is formed with an interference hole through which the projecting portion is fitted.

Further, it is preferable to further include a rotation clearance setting unit for limiting a relative rotation clearance between the hub axis unit and the latch interference drum.

According to the bicycle shifting device of the present invention, gear shifting can be performed while traveling, and gear shifting can be performed even in a stationary state. In particular, when the braking operation is performed, the mode is changed to a mode in which gear shifting is possible in the stop state, so that gear shifting is facilitated.

In addition, by including a sub-restraint unit for switching to a gear changeable mode at the time of a brake operation or for blocking a mode change at a source, the user can selectively apply the same.

1 is an exploded perspective view showing a bicycle transmission according to an embodiment of the present invention.
2 is an assembled cross-sectional view of the bicycle transmission of FIG.
FIG. 3 is a view showing a state in which a hub shaft unit and a connection shaft are constrained by a constraint latch in the bicycle transmission of FIG. 1;
FIGS. 4 and 5 are views showing a state in which the constraint latch is released from the state of FIG. 3; FIG.
Fig. 6 is a view for explaining a main part of the sprocket unit shown in Fig. 1. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a bicycle transmission according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 5, a bicycle transmission 100 according to an embodiment of the present invention includes a hollow coupling shaft 20 coupled to a hub shaft unit 30 to which a wheel of a bicycle is coupled, A sprocket unit 40 coupled to one end of the connecting shaft 20, a restricting unit 50, and a control unit 70.

The hub shaft unit 30 has a cylindrical shape in which a bicycle wheel is coupled to an outer periphery and has a hollow opening at both ends and a constraining latch 52 is supported at one side of a center wheel engagement portion 31 to which the wheels are coupled A latch support flange 33 is provided. That is, the latch support flange 33 has a cylindrical shape and extends from one side of the wheel engagement portion 31 and may be formed integrally or separately. The latch support flange 33 has a cylindrical shape and a latch through hole 33a is formed in which the constraining latch 52 is accommodated to be movably installed. A plurality of latch through holes 33a corresponding to the number of latching latches 52 may be formed symmetrically with respect to each other.

The connecting shaft 20 is coupled to the hollow interior of the hub shaft unit 30 having the above-described structure so that both ends thereof are exposed to the outside. The connecting shaft 20 is relatively freely rotatable relative to the hub shaft unit 30 Is supported by the first bearing (11). The connection shaft 20 also has a hollow opening at both ends and a first coupling portion 23 is formed at one end of the coupling shaft body 21 with a hollow shape to which the sprocket unit 40 is coupled, And a second engaging portion 25 to which a later-described interference portion 51 is coupled is formed at the other end. The supporting flange 27 is extended outside the connecting shaft body 21 adjacent to the first connecting part 23 to limit the position where the connecting shaft 20 is coupled to the inside of the hub shaft unit 30 It acts as a stopper. The first coupling portion 23 has a gear structure that is formed by repeatedly forming bones and mountains in the circumferential direction on the outer periphery of the coupling shaft body 21 so that the sprocket unit 40 can be coupled and operated integrally .

The center shaft 10 is provided so as to pass through the hollow of the connecting shaft 20 and the connecting shaft 20 is freely rotatable with respect to the center shaft 10. To this end, a second bearing (13) is provided outside the tightening nut (12) which is respectively engaged with both ends of the center shaft (10). A frame of the bicycle is connected and fixed to the central shaft 10. Therefore, the connecting shaft 20 is freely rotatable with respect to the fixed center shaft 10. [

The sprocket unit 40 is coupled to the first engaging portion 23 at one end of the connecting shaft 20 and transmits a rotational force by the chain to the connecting shaft 20 in the bicycle traveling direction A1, And in the reverse direction (A2), it is freely rotatable so as not to transmit the rotational force to the connecting shaft (20). The sprocket unit 40 is a known technology, and is applied to a general bicycle transmission. The sprocket unit 40 is provided with a latch for allowing rotation in one direction and suppressing rotation in the opposite direction.

More specifically, the sprocket unit 40 includes a latch support member 41 that is specifically engaged with the first engagement portion 23 of the connection shaft 20, A latch 43 which is movably installed on the latch support member 41 and a latching portion 44 formed on the inner periphery of the sprocket support member 42 along the circumferential direction, And an elastic ring (45) for providing an elastic force to come into contact with the elastic ring (45). A plurality of sprockets 46 are installed on the outer periphery of the sprocket support member 42 so that the chain is connected. The latch 43 restrains the connection shaft 20 to rotate together when the sprocket 46 rotates in the traveling direction A and prevents the rotational force from being transmitted to the connection shaft 20 in the reverse direction B. A bearing 47 may be provided between the sprocket support member 42 and the latch support member 41. A cap member 48 is coupled to the outside of the latch support member 41 to support the sprocket support member 42 Suppress separation. Since the sprocket unit 40 having such a configuration can be understood from the known technology, no further detailed description will be given and it should be understood that the present invention is not limited by the configuration of the sprocket unit 40. [ An example of the latch 43, the latch support member 41, and the like is shown in Fig.

The restraining unit 50 includes an interfering part 51 coupled to the second engaging part 25 of the other end of the connecting shaft 20, (Not shown). The interfering portion 51 is formed on the outer circumferential surface so as to have an apex and a crest as shown in Fig. 3. When the end of the constraining latch 52 enters the valley as shown in Fig. 3, the connecting shaft 20 and the hub axle unit 30 are confined and rotated together in the A1 direction.

A latch receiving hole 33a is formed in the latch support flange 33 so as to be rotatably received in a state where the constraining latch 52 passes through the inside and the outside. Thus, the constraining latch 52 is supported by the pivot pin 53 in a state of being accommodated in the latch accommodation hole 33a, and is rotatable. That is, the pivot pin 53 is coupled through the latch receiving hole 33a at the end of the latch support flange 33 to rotatably support the constraining latch 52. [ The constraining latch 52 supported by the pivot pin 53 is restrained by the constraint control unit 60 so that when the end of the constraint latch is interfered with the ball of the interference portion 51 as shown in Fig. 30 can be rotated together with the sprocket unit 40 in the running direction A and freely rotated in the opposite direction B together.

The locking latch 52 has a protrusion 52a protruding from the latch support flange 33 on the basis of the pivot pin 53. The protrusion 52a is changed in the state of being restrained by the control unit 60 so that the turning operation of the constraining latch 52 is performed in accordance with the operation of the control unit 60, Contact and separation operations can be performed.

The control unit 60 includes a latch interfering drum 61 fitted and coupled outside the latch support flange 33, a drum control part 63 selectively providing a load to the latch interfering drum 61, 65).

The latch interference drum 61 has a hollow interference drum body 61a fitted to be coupled to the outside of the latch support flange 33 and a disk latch support flange 61b extended from one end of the interference drum body 61a . The interference drum body 61a is formed with an interference hole 61c which is provided in the latch support flange 33 and into which the projecting portion 52a of the constraining latch 52 exposed to the outside is fitted. The interference hole 61c is formed at a predetermined distance from the end of the interference drum body 61a. A brake disc 70 is coupled to the disc latch support flange 61b. The latch interference drum 61 has a rotation clearance setting unit 80 having a rotation clearance of a predetermined angle with the latch support flange 33 or the hub shaft unit 30 and limiting the rotation angle so as to maintain the rotation clearance Respectively.

The rotation clearance setting unit 80 includes a stopper member 81 protruding from the outside of the latch interference drum 61 and a stopper member 81 provided outside the wheel engagement unit 31 of the hub shaft unit 30 so as to correspond to the stopper member 81 And a rotation angle recessed groove (83) formed therein. When the latch interference drum 61 is coupled to the latch support flange 33, the stopper member 81 is positioned in the rotation angle clearance groove 83. In this state, the latch interference drum 61 is rotated by the rotation angle clearance groove 83 The rotation angle relative to the hub axis unit 30 can be limited by the size. A plurality of the stopper members 81 and the rotation angle clearance grooves 83 may be provided, and the positions of the stopper members 81 and the rotation angle clearance grooves 83 may be mutually different.

The drum control unit 63 selectively provides a load to the latch interference drum 61 so that the latch interference drum 61 is rotated independently of the hub axis unit 30 by the rotation clearance, 52 are pushed by the latch interference drum 61 (rotated) and separated from the interference portion 51. Therefore, in the state of FIG. 5, the rotational force of the connecting shaft 20 is not transmitted to the hub axis unit 30 in the traveling direction A1 and the reverse direction A2, so that the gear can be shifted even in the stationary state. The drum control portion 63 may have a contact portion 63a selectively contacting and disengaging the brake disk 70 to selectively provide a load, i.e., a frictional force. This contact portion 63a may include, for example, a disk pad of a disk brake. Therefore, when the operation lever mounted on the bicycle handle and the drum control portion 63 are connected by a wire, the contact portion 63a can be brought into contact with and separated from the brake disk 70 by lever operation of the operation lever. The drum control unit 63 can apply the structure of a general brake device as described above or a structure having a separate contact pad, so that the present invention is not limited to the specific examples.

The return spring 65 is provided between the latch interference drum 61 and the latch support flange 33 so that the latch interference drum 61 is rotated by the rotation clearance as shown in FIG. To the state shown in FIG. 3, when the load of the load (not shown) is released. The return spring 65 is a coil spring and can be fixed to the latch interference drum 61 at one end and to the latch support flange 33 or the hub shaft unit 30 at the other end.

A cap member 67 is further provided at the end of the latch support flange 33 so that the latch interference drum 61 is not separated from the latch support flange 33.

The protruding portion 52a of the constraining latch 52 is restrained by the latch interference drum 61 and is held in the posture of the constraining latch 52 according to the rotational state of the latch interference drum 61 Can be changed and selectively contacted with or separated from the interfering portion 51.

Therefore, when the load is provided to the latch interference drum 61 by the drum control unit 63, the latch interference drum 61 is relatively rotated independently of the hub shaft unit 30 and the rotation clearance, Is changed from the state of FIG. 3 to the posture of FIG. Therefore, the restraint between the connection shaft 20 and the hub shaft unit 30 is released, and they can freely rotate with respect to each other. Therefore, even if the sprocket unit 40 is rotated in the normal direction and the reverse direction, the hub shaft unit 30 is in a freely rotatable state in which no rotational force is transmitted, and gear shifting is possible even in the stopped state. Gear shifting is possible.

When the load applied to the interference drum 61 is released, the interference drum 61 is returned to its original position by the return force of the return spring 65, and the restraining latch 52 is also returned to the interference drum 61 So that the hub shaft unit 30 in the traveling direction A1 is restrained with respect to the connecting shaft 20 so that the hub shaft unit 30 rotates together.

When the user wishes to perform gear shifting in a stopped state or in a flat or slanting gear regardless of the rotation of the bicycle wheel while using the bicycle as described above, the constraining latch 52 is released by operating the drum control unit 63. [ The connection shaft 20 is freely rotatable relative to the hub shaft unit 30 by releasing the restraint of the hub shaft unit 30 with respect to the connection shaft 20. [ Therefore, when the bicycle pedal is rotated in the traveling direction A1 and the sprocket rotates in the traveling direction A1, the rotational force is transmitted only to the sprocket unit 40 and the connecting shaft 20, The rotational force is not transmitted. As a result, even if the pedal is stepped in the direction of travel, the rotational force is not transmitted to the bicycle wheel, so that the gear can be shifted even in the stopped state, and the load applied to the pedal can be minimized So that a shift can be performed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Those skilled in the art will readily appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims.

100 .. Bicycle transmission 10 .. Center axis
20 .. Connection shaft 30 .. Hub shaft unit
40 .. sprocket unit 50 .. restraining unit
51. Interference part 52. Constraining latch 60. Control unit 61. Latch interference drum
63 .. Drum control part 65 .. Return spring

Claims (6)

A hollow connecting shaft installed to penetrate the hollow of the hub shaft unit to which the wheels of the bicycle are coupled and rotatably engaged with the hub shaft unit;
A sprocket unit installed at one end of the connecting shaft and transmitting rotational force to the connecting shaft in the bicycle traveling direction and freely rotating with respect to the connecting shaft in the opposite direction;
A restraining unit that selectively restrains and releases the other end of the connecting shaft with respect to the hub shaft unit and rotates integrally when restrained;
And a control unit selectively releasing the restricting state of the restricting unit to allow the connecting shaft to freely rotate with respect to the hub shaft unit. 2. The hub unit according to claim 1,
A center wheel coupling portion coupled to the outer periphery of the bicycle wheel and having a hollow opening at both ends,
And a latch support flange coupled to one side of the wheel coupling portion and cylindrically connected to the wheel coupling portion, wherein the constraining latch of the constraining unit is supported,
Wherein a latch through hole is formed in the latch support flange so as to be rotatably installed so that the constraining latch penetrates the inside and outside of the latch support flange. The apparatus according to claim 2,
An interference part provided on an outer periphery of the other end of the connection shaft;
And a constraining latch installed in the latch through hole of the latch support flange so as to selectively interfere with the interference portion. 4. The apparatus according to claim 3,
A latch interference drum coupled to an outside of the latch support flange and rotated together with a rotation clearance with the latch support flange, the latch interference drum being connected to the constraint latch to control the turning operation of the constraint latch;
A drum control unit selectively providing a load to the latch interference drum;
And a return spring for returning to the home position when the load is released, in a state where the latch interfering drum is relatively rotated with respect to the latch supporting flange by the rotation clearance when a load is applied from the drum control unit to the latch interference drum In addition,
And the restraining latch has a protrusion protruding outside the latch supporting flange and connected to the latch interference drum to be driven. 5. The method of claim 4,
And the latch interference drum is formed with an interference hole into which the protrusion is fitted from the end portion. 6. The method according to any one of claims 2 to 5,
Further comprising a rotation clearance setting unit for limiting a relative rotation clearance between the hub axis unit and the latch interference drum.

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