JPS5845361B2 - bicycle unit hub - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a unit hub for a bicycle, which is easy to adjust, has a simple structure, and can incorporate a driving member into a ball pushing member, allowing both to be integrated in advance, making handling easier. The purpose is to provide a simple unit hub for bicycles.

The present invention will be specifically explained below based on the embodiment shown in FIG.

Reference numeral 1 denotes a ball pushing member screwed onto the hub shaft 2, on which a group of rollers 3 is arranged on the outer periphery of the distal end, and a group of balls 4 is arranged on the outer periphery of the proximal end.

This ball pushing member 1 is different from the conventional one in that it has a long axial dimension, and its tip reaches radially inward of a spoke attachment flange 6 of a driven member 5, which will be described later.

The roller group 3 is disposed on the outer periphery of the ball pushing member 1 and its movement in the axial direction is regulated by a stepped portion 7 provided on the outer periphery of the ball pushing member 1 and a retaining ring 8 fitted to the ball pushing member 1.

It is also preferable to hold the roller group 3 with a retainer (not shown).

9' and 9' are washers placed before and after the roller group 3,
It's not required.

The ball group 4 is arranged on a ball receiving surface 10 formed on the outer periphery of the ball pushing member 1 so as to incline inward, since it has a large number of steel balls formed with a larger diameter than the ball group 9 described later. .

A drive member 11 rotates integrally with the gear 12, and is rotatably supported on the outer periphery of the ball pushing member 1 via the roller group 3 and ball group 4.

In the illustrated example, a gear 1 is attached to the outer periphery of the proximal end of the drive member 11.
2 and dustproof cover 13 are integrally attached using a retaining ring 14, and a ratchet claw 1 is attached to the outer periphery of the distal end side of the drive member 11.
5, 15... are arranged.

Further, a ball receiving surface 16 is formed on the inner periphery of the driving member 11 so as to face the ball receiving surface 10, and the ball group 4 is held between both ball receiving surfaces 10 and 16. A protrusion 25 is formed that protrudes radially inward.

Further, a ball receiving surface 17 is formed at the center of the outer periphery of the drive member 11 so as to be inclined inward.

Although the illustrated embodiment relates to a unit hub equipped with one gear 12, it is also possible to use a unit hub equipped with multi-stage gears instead.

Reference numeral 5 denotes a driven member that rotates integrally with the hub body 18, and a ball group 9
The drive member 11 is rotatably supported in one direction via a one-way rotation mechanism 19.

In the illustrated example, this driven member 5 is formed in a bowl shape,
It has a spoke mounting flange 6 on its outer periphery and is press-fitted and integrated into the hub body 18.

Further, a ball receiving surface 20 for supporting the ball group 9 is formed at the tip of the inner circumference of the driven member 5, and a ratchet that engages with the ratchet pawls 15, 15, etc. is formed at the deep inner circumference. Teeth 21 are carved.

The check mechanisms 15 and 21 represent one aspect of the one-way rotation mechanism.

The ratchet mechanism 15.21 is also located approximately at the same axial position as the roller group 3.

In the figure, 22 is a lock nut, 23 is a washer, 24 is a nut, and 26 is a threaded portion of the hub shaft 2.

Next, a method for assembling the device of the present invention will be explained.

The ball pushing member 1 and the driving member 11 are arranged such that a ball group 4 and a roller group 3 are disposed between them at predetermined positions, and a stop shaft 8 is fitted into a predetermined position of the ball pushing member 1, so that the ball pushing member 1 and the driving member 11 are in a relaxed state. Can be stitched together and integrated.

In this way, the hub body 18 and the driven member 5 are arranged at predetermined positions on the outer periphery of the hub shaft 2, and the ball pushing member 1 and the driving member 11
screwed into the threaded part 26 of the hub axle 2,
After disposing the ball group 9 between the driven member 5 and the driving member 11, the ball pushing member 1 is screwed along the hub shaft 2, and a predetermined pressing force is applied to both ball groups 4 and 9 to drive them. Member 11
Then, the driven member 5 is adjusted so that it rotates smoothly, and then the lock nut 22 screwed onto the hub axle 2 is screwed to fix the ball pushing member 1 to the hub axle 2, thereby attaching the device of the present invention to the rear of the bicycle. Can be assembled to the right hub of the wheel.

The bicycle unit hub of the present invention has the above-mentioned configuration, and the adjustment work for smoothly rotating the drive member 11 and the adjustment work for smoothly rotating the driven member 5 are performed using a ball with respect to the hub shaft 2. This can be done all at once by adjusting the tightening of the pushing member 1.

This is because one of the pair of left and right rotary support members supporting the drive member 11 is constituted by a roller group 3 that does not require adjustment in the axial direction. Compared to a case where the bearing portion is entirely composed of ball groups a, b, and c, the assembly work and adjustment work can be halved.

Furthermore, even if the ball groups 4 and 9 are worn out after using the device of the present invention and need to be readjusted, the adjustment can be made by screwing in the ball pushing member 1 by a slight amount, which requires disassembly and reassembly of the device. The work is extremely easy because there is no need to do so.

According to the conventional example shown in FIG. 2, adjustment by tightening the screw cap d is required, and the device must be disassembled and reassembled, making the work complicated.

Further, according to the present invention, since the ball group 4 and the roller group 3 are disposed on the outer periphery of the ball pushing member 1 to support the driving member 11, the ball bearing e1, the core f1, the screw cap d, etc. in the conventional example are replaced. A single ball pushing member 1 can serve as a plurality of components, thereby reducing the number of components and simplifying the structure, resulting in cost reduction.

Further, according to the present invention, as described above, the ball pushing member 1 and the driving member 1
1 can be assembled in advance to form one unit, and this unit can be assembled into the hub shaft 2 and the driven member 5, making assembly and disassembly work easy.

Further, according to the present invention, when the gear 12 is stopped and rotates due to inertia, only the radially outer ball group 9 rotates, and the radially inner ball group 4 and roller group 3 remain stationary.
Frictional resistance within the device is small, allowing the bicycle to run smoothly and reducing wear and tear on parts.

According to the conventional example, three ball groups a, b, and c rotate, resulting in increased frictional resistance and increased wear and tear on parts.

Furthermore, according to the present invention, the weight of the vehicle body loaded on the radially outer ball group 9 can be distributed to the ball group 4 and the roller group 3 arranged on both sides of the radially inner side. The rotation of the bicycle can be made smoother, which in turn allows the bicycle to run more smoothly.

Note that the one-way rotation mechanism 19 is a ratchet mechanism 15.2.
1, the conventional example had the disadvantage that precession occurred in the core f etc. due to the intermittent increase and decrease of the load transmitted from the ratchet mechanism, causing the wheel to swing. If the drive member 11 is disposed at a radially inward position of .21 and configured to support the drive member 11 over a predetermined length in the axial direction, the precession can be regulated and the above drawbacks can be corrected.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the bicycle unit hub of the present invention, and FIG. 2 is a partially cutaway sectional view of a conventional example. 1...Ball pushing member, 2...Hub shaft, 3.
...Roller group, 4...Ball group, 5...
... Driven member, 9 ... Ball group, 11 ...
... Drive member, 12 ... Gear 18 ...
...Hub body, 19...One-way rotation mechanism.

Claims (1)

[Claims] 1. A ball pushing member is screwed onto the hub shaft, a roller group is arranged on the outer periphery of the distal end side of the ball pushing member, and a ball group is arranged on the proximal outer periphery, and the roller group and the ball group are arranged on the outer periphery of the proximal end side. A drive member that rotates together with the gear is rotatably supported on the outer periphery of the ball pushing member, and a driven member that rotates integrally with the hub body is mounted on the outer periphery of the drive member through a group of balls and a one-way rotation mechanism. A bicycle unit hub characterized by being rotatably supported. 2. The bicycle unit hub according to claim 1, wherein the one-way rotation mechanism is constituted by a ratchet mechanism, and the ratchet mechanism is located on the outer periphery of the roller group.