KR940008683Y1 - Direct tranmission system for bicycle - Google Patents

Abstract

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Description

[Designation name]

Bicycle Direct Transmission Unit

[Brief Description of Drawings]

1 is a partial plan view of a transmission device according to the present invention.

2 is a partial cross-sectional view showing one end of the device of FIG.

3 is an exploded view of the box surrounding the rear end of a direct transmission.

* Explanation of symbols for main parts of the drawings

12: rear axle 14: hub

20: drive shaft 21: drive bevel gear

24: cone 30: box

31: notch 32: hole

33: first member 35: groove

37: protrusion 39: tightening screw

40: sleeve 43: bearing

45: support ring 46: spring

51: annular flange

[Detailed Description of Design]

[Design background]

The present invention relates to a direct transmission device for a bicycle, and more particularly, to a direct transmission device for a bicycle improved to facilitate assembly and disassembly of a rear wheel while both ends of the rear wheel shaft is stably supported.

The direct transmission device, unlike the sprocket and the chain as a power transmission medium, has a drive side between the pedal shaft and the hub of the rear wheel, and a bevel gear group is arranged at both ends of the drive shaft, thereby pedaling without sprockets and chains. It is a device to transmit the power of the shaft to the rear wheel.

This direct transmission inevitably increases the hub side thickness of the rear wheel of the bicycle.

If the hub side thickness of the rear wheel becomes thick, it is difficult to support both ends of the rear wheel with forked bifurcated fork, and when the rear wheel is disassembled, the transmission device must be directly disassembled, so repair work during tire puncture is very difficult. There is a problem that becomes cumbersome.

Due to this problem, since the bicycle to which the direct transmission device is applied deforms the frame and supports only one end of the rear wheel, the support state of the rear wheel becomes unstable.

It is an object of the present invention to provide a direct transmission device for a bicycle that is improved to facilitate disassembly and assembly of the rear wheels while the rear wheels of the bicycle are supported by both ends at the rear lower side of the premise.

Another object of the present invention is to provide a direct transmission device for a bicycle that can be firmly assembled so that the drive shaft interposed between the pedal side and the rear wheel shaft does not flow in the axial direction.

According to the above object, the present invention has a drive shaft interposed between the pedal shaft and the hub of the rear wheel, and the bicycle directly to the power transmission from the pedal shaft to the rear wheel by the bevel gear group installed at both ends of the drive shaft. As a transmission device, a box is mounted at one end of a frame that is a two-pronged fork, and a drive bevel gear fixed to the end side of the drive shaft is accommodated inside the box, and the drive bevel gear is placed inside the box. While rotatably supported by a sleeve forcedly coupled to a predetermined position, the box is also integrally mounted on one side thereof with a semicircular first member for engaging with a ring element rotatably supporting a cone connected to the hub, A separate second member symmetrically coupled to the first member, the second member being coupled to each other, and having a width corresponding to the diameter of the rear wheel shaft on the rear outer surface of the box; It proposes a direct transmission device for a bicycle having a notch in which the notch extends and communicates with a hole having a larger diameter.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view showing a frame of an applied bicycle of the present invention.

Although the frame 10 is substantially in the form of a two-fork like a bicycle in a conventional chain drive, a box 30 is attached to one fork member.

The pedal shaft 11 is supported at the front end of the frame 10, and the rear wheel shaft 12 is supported at the two forks from the rear end, respectively.

The rear wheel is rotatably supported by the rear wheel shaft 12 via the hub 14, and one shaft of the hub 14 is associated with the box 30 described above.

2 is a cross-sectional view showing a linkage structure between the hub 14 and the box 30.

The drive shaft 20 extending through the inside of the tube member constituting the frame 10 is fixedly attached to the drive bevel gear 21 at its end.

The hub 14 has a movable cone 22 therein, and the movable cone 22 includes a driven bevel gear 23 rotatably supported by the rear wheel shaft 12.

The power of the drive shaft 20 is transmitted to the hub 14 via both bevel gears 21 and 23. Since the power transmission method is the same as the conventional direct transmission device, detailed description thereof will be omitted.

The box 30 has a sleeve 40 therein for supporting the drive bevel gear 21 therein.

The sleeve 40 has an annular flange 41 inside, and ball bearings 42 and 43 are provided on both sides of the annular flange 41.

The diameter of the drive bevel gear 21 is larger than that of the drive shaft 20, and the rear end side thereof has an outer shape in which the show rate slider 27 is formed.

The ball bearing 42 is interposed between the shoulder 27 and the annular flange 41, and another bearing 43 is inserted into the boss side of the driving bevel gear 21, the race 44 and the annular flange 41 Positioned between to help smoothly rotate the driving bevel gears 21, respectively.

On the other hand, the race 44 is installed to receive the elastic force of the spring 46 supported by the support ring 45 fitted to the boss portion of the drive bevel gear 21.

As the driving bevel gear 21 is supported by the sleeve 40 as described above, the driving shaft 20 is firmly mounted so as not to flow in the axial direction.

3 is an exploded perspective view illustrating in detail the configuration of the box 30.

A notch 31 is formed at the rear outer end of the box 30, and the notch 31 communicates with a hole 32 having a larger diameter.

It is preferable that the width of the notch 31 be at least equal to the diameter of the rear wheel shaft 12.

A side through which the driven bevel gear 23 of the hub 14 penetrates is formed in the side surface of the box 30, and the semi-circular first member 33 is integrally attached to the outside by welding.

The semicircular first member 33 is combined with the second member 34 symmetrically to form a round shape.

The first member 33 has a groove 35 on its inner circumferential surface, and protrusions 37 having engraved screw holes 38 are formed at both ends thereof.

A groove 36 is formed in the inner circumferential surface of the second member 34 in the same manner as the first member 38, and a hole 380 through which the fastening screw 39 penetrates is formed at both side ends thereof. 370 is retained, but it is integral with the plate member for closing one side of the box 30 in which the notch 31 is opened, and is separate from the box 30. When the first member 33 and the second member 34 are firmly combined with each other by the fastening screw 39, the box 30 is integrally formed with the ring mill 50 as depicted in FIG. Combined.

More specifically, the movable cone 22 installed at one end of the hub 14 is rotatably supported by the cone 24, the icon 24 is a ring element that is integrally coupled with the box 30 described above. It is supported by 50 so that rotation is possible.

The ring element 50 has an annular flange 15 therein, and ball bearings 53 and 54 are interposed on both sides of the annular flange 51 to rotatably support the cone 24. .

The ring element 50 has ribs 51 formed on the outer circumference thereof, and the ribs 51 are grooves 35 and 36 formed on the inner circumferential surfaces of the first member 33 and the second member 34. To match.

Therefore, when the first member 33 and the second member 34 are combined and integrated at the outer circumference of the ring element 50 by the fastening screw 39, the ribs 52 are formed into the grooves 35 and 36 of the inner circumferential surface thereof. ) Is firmly mounted so as not to deviate in the axial direction of the rear axle 12.

On the other hand, the portion supported by the box 30 in the rear wheel shaft 12 is fixed by the lock nut 47 and the sleeve nut 48 installed through the hole (32).

According to the configuration of the present invention as described above, as both ends of the rear wheel shaft 12 is supported between the one end of the frame 10 and the box 30, the advantage that is mounted stably like a conventional chain-driven bicycle There is this.

In addition, the rear axle 12 can be disassembled by only a simple operation of releasing the sleeve nut 48 without dismantling the box 30, so that the rear wheel can be easily separated.

For example, if the user needs to repair a flat tire, first disassembling the rear axle 12, the interior of the ring element 50 is firmly coupled to the box 30 of the cone 24 of the hub 14. As it is simply pulled out from the result is that the rear wheel between the frame 10 and the box 30 can be easily separated. At this time, as well as the tooth connection between the driven bevel gear 23 and the driving bevel gear 21 is separated, as well as recombination thereof is very easy.

As described above, the present invention also supports both ends of the rear wheel shaft stably, and also has the advantage of easily and easily disassembling the rear wheel. In addition, since the box is not dismantled at all during disassembly and assembly of the rear wheels, the failure of the direct transmission device is extremely low, and the service life can be greatly extended than the conventional device.

Claims (2)

A drive shaft is disposed between the hub and the pedal shaft of the rear wheel rotatably supported by the frame, and the drive shaft is a direct transmission device for a bicycle configured to transmit power between the hub and the pedal shaft via a bevel gear group at both ends. In this case, the frame 10 is a two-pronged fork, and a box 30 is mounted at one end thereof, and the slits for holding the annular flange 41 on the inner circumferential surface at a predetermined position inside the box 30. The eve 40 is forcibly fitted, the ball bearings 42 and 43 are positioned on both sides of the annular flange 41, and are fixedly attached to the end of the drive shaft 20. The driving bevel gear 21 having the support is rotatably supported in the inner circumference of the annular flange 41 by the pair of ball bearings 42 and 43 described above, and the ball bearing 43 is a race ( Held by 44), The race 44 is pressurized by a spring 46 supported by a support ring 45 fixed to the boss portion of the drive bevel gear 21, and a rear wheel is provided at the rear outer end of the box 30. It has a notch 31 having a width through which the shaft 12 can pass, which notch 31 extends long and is slightly smaller in diameter than the sleeve nut 48 clamped to the rear wheel shaft 12 described above. Direct transmission device for a bicycle, characterized in that it is integrally in communication with the hole (32) formed to have a. 2. The hub (14) according to claim 1, wherein the hub (14) has a cone (24) for rotatably supporting a driven bevel gear (23), the cone (24) having ribs (52) formed on its outer circumferential surface. A semicircular first member 33, which is rotatably supported by a ring element 50, which is integrally fixed to one side of the box 30 by the ribs 52 of the ring element 50; The first member 33 and the second member 34 are coupled to each other such that the grooves 35 and 36 formed on the inner circumferential surfaces of the second member 34 are symmetrical to each other. Direct transmission device for a bicycle, characterized in that the ring element 50 is configured to be firmly mounted to the box (30).