JPH0610096U - Direct transmission mechanism for bicycles - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a direct transmission mechanism in which a rear wheel axle of a bicycle is stably fixed in a predetermined position and can be easily removed when necessary. A direct transmission mechanism includes a hub rotatable with respect to a rear axle, a first conical gear portion provided on a shaft rotatable with respect to a box body, and a first conical gear portion fixed to the hub. A second conical gear portion that meshes. The box is
The rear end has a notch on the outer end. The notch has a hole at the inner end. The rear axle is inserted into the hole through the notch, and by fixing the sleeve nut to the hole and the rear axle, the rear axle is stably held at a predetermined position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmission mechanism such as a bicycle.

[0002]

[Problems to be solved by the device]

 The bicycle's rear axle is firmly fixed and cannot be easily removed. Therefore, it is very inconvenient if the tire of the bicycle is flat and the rear wheels have to be removed for repair.

[0003]

[Outline of the device]

 The present invention provides a direct transmission mechanism for a bicycle, in which the rear wheel axle of the bicycle is stably fixed to the lower rear fork and accommodates the direct transmission mechanism. It can be easily removed without removing the box. The bicycle shaft is supported so that it can rotate only and cannot move in the longitudinal direction.

[0004]

【Example】

 As shown in FIG. 1, the direct transmission mechanism is provided in a bicycle or the like. The bicycle has a front axle 11 rotatably supported at the front end of the frame 10 and a rear axle 12 fixed at the rear end of the frame 10. The hub 14 is rotatably associated with the rear axle 12. The box body 30 is fixed on one side of the rear axle 12 so as to directly house the transmission mechanism.

Next, as shown in FIGS. 2 and 3, the rear end of the shaft 20 extends into the box body 30. A first conical gear portion 21 is formed at the rear end of the shaft 20. A first cone 22 rotatably mounted about the rear axle 12 has a second conical gear portion 23 formed at the right end, the gear portion 23 being a first conical gear portion of the shaft 20. It meshes with the conical gear part. The hub 14 will be rotationally driven by the first conical part 22 driven by the shaft 20 through the engagement of the first and second conical gear parts 21,23. Since it is well known how to rotate the hub 14, detailed description thereof will be omitted.

As shown in FIG. 2, the sleeve 40 is press-fitted into the box body 30. An annular flange 41 is formed inside the sleeve 40. Ball bearings 42 and 43 are provided on both sides of the annular flange 41. The first conical gear part 21 has a larger diameter than the shaft 20, and a shoulder 27 is formed on the rear surface of the first conical gear part 21. The ball bearing 42 is rotatably arranged between the shoulder portion 27 and the annular flange 41. Since the first conical gear portion 21 has a large diameter, the shaft 20 cannot move forward with respect to the box body 30. A gasket 44 is in contact with the ball bearing 43. A holding ring 45 is engaged with the shaft 20. Since the spring 46 is interposed between the retaining ring 45 and the gasket 44, the shaft 20 is biased with respect to the box body 30, and the shaft 20 cannot move in the longitudinal direction with respect to the box body 30. .

As shown in FIG. 3, a notch 31 is formed at the rear outer end of the box body 30, and a hole 32 is formed at the inner end of the notch 31. The width of the notch 31 is equal to the diameter of the rear axle 12 so that the rear axle 12 can be directly inserted into the hole 32 through the notch 31. A nut 47 is screwed onto the rear axle 12. A sleeve nut 48 having an outer diameter equal to the inner diameter of the hole 32 is inserted into the hole 32 and screwed into the free end of the rear axle 12, so that the rear axle 12 can be held in a fixed position in a stable manner. . When it is necessary to remove the rear axle 12 from the box 30, the sleeve nut 48 can be simply removed from the rear axle 12 to remove the rear axle 12 from the box 30 through the notch 31.

The second conical piece 24 is screwed onto the right end of the hub 14 and is rotatable with respect to the first conical piece 22. The ring element 50 has an annular flange 51 inside and is rotatably supported at the free end of the second conical part 24 by two ball bearings 53, 54. Ribs 52 are formed on the outer surface of the ring element 50. As shown in FIG. 3, the semicircular first member 33 is integrally fixed to the box body 30 by welding or the like. Two lugs 37 each having a threaded hole are integrally formed with the first member 33. A groove 35 is formed on the inner surface of the first member 33. Further, the semicircular second member 34 has a lug 370 formed at each end thereof. A hole 380 is formed in each lug 370. A groove 36 is formed on the inner surface of the second member. When the two members 33, 34 are mounted around the ring element 50 and secured together by screws 39, the grooves 35, 36 form an annular groove to receive the rib 52 of the ring element 50 and the box 30. Is stably held in place.

[0009]

[Effect of device]

 The direct transmission mechanism of the present invention has the following effects. (1) The bicycle rear wheel axle is stably fixed to the lower rear fork and can be easily removed without removing the box that houses the direct transmission mechanism. (2) The bicycle shaft is supported so that it can only rotate and cannot move in the longitudinal direction. (3) The box body 30 is stably held at a predetermined position.

[Brief description of drawings]

FIG. 1 is a partial plan view of a direct transmission mechanism.

FIG. 2 is a partial cross-sectional view for explaining an end of a direct transmission mechanism.

FIG. 3 is an exploded perspective view of a box that houses a rear end portion of the direct transmission mechanism.

[Explanation of symbols]

 10 Frame 11 Front Axle 12 Rear Axle 14 Hub 20 Shaft 21 First Conical Gear Part 22 First Conical Part 23 Second Conical Gear Part 24 Second Conical Part 30 Box Body 31 Notch 32 Hole 33 First Member 34 Second Member 35 , 36 groove 40 sleeve 41 annular flange 42, 43 ball bearing 44 gasket 45 retaining ring 46 spring 48 sleeve nut 50 ring element 51 annular flange 52 rib 53, 54 ball bearing

Claims (2)

[Scope of utility model registration request] 1. A box having a front axle rotatably supported at a front end of a frame and a rear axle fixed to a rear end of the frame, wherein a hub is rotatably provided around the rear axle. A direct transmission mechanism for a bicycle, the body of which is provided at one end of the rear axle,
The direct transmission mechanism has a shaft disposed within the box body and having a rear end extending into the box body, a first conical gear portion formed at the rear end of the shaft, a first conical component at one end thereof. A second conical gear portion formed on the rear axle for rotation about the rear axle;
A conical part is coupled to one end of the hub and is rotatable with respect to the first conical part, the first conical gear part of the shaft meshing with the second conical gear part of the first conical part. The first conical part is rotatably driven by the shaft by the engagement of the first and second conical gear parts, the sleeve is press-fitted into the box body, and the annular flange is attached to the inner surface of the sleeve. Formed, a pair of ball bearings are provided on both sides of the annular flange, the second conical gear portion having a larger diameter than the shaft, and one of the ball bearings of the second conical gear portion and the annular flange. Rotatably disposed therebetween to prevent the shaft from moving in the direction of the annular flange, and the gasket contacts the other ball bearing to retain the shaft. A ring engages the shaft, and a spring is interposed between the retaining ring and the gasket to urge the shaft toward the annular flange and move the shaft in the longitudinal direction with respect to the box body. A notch is formed at the rear outer end of the box body, a hole is formed at the inner end of the notch, the rear axle is inserted through the notch into the hole, and the sleeve nut Is inserted into the hole and screwed into a free end of the rear axle, so that the rear axle can be stably held at a predetermined position and can be easily removed. Direct transmission mechanism. 2. A ring is rotatably supported on a free end of the second conical part, ribs are formed on an outer surface of the ring, and a semicircular first member is integrally fixed to the box body.
A semi-circular second member is fixed to the first member so as to hold the ring, and a groove is formed on an inner surface of each of the first member and the second member. An annular groove is formed so that the groove receives the rib of the ring when the first member and the second member are fixed together, so that the box body is stably held at a predetermined position. The direct transmission mechanism according to claim 1, wherein: