JPS5917291B2 - Hub device for unidirectional power transmission in bicycles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for a bicycle.
・Regarding improvement of a buoy device that incorporates a one-way power transmission mechanism within the bubo body.

As this type of hub device, freewheel type and unit lever type types have conventionally existed, but both of these have a built-in box mechanism.

A bicycle with a built-in ratchet mechanism has the property that when the wheel is reversed, power is transmitted in the opposite direction through the hub body and the ratchet mechanism, reversing the drive body and sprocket, and eventually reversing the pedals.

For this reason, when pushing a bicycle to be stored indoors or in a garage, if the bicycle is backed up in a narrow space, the opposite shin or other part of the bicycle is often hit by the reverse pedal, causing an unpleasant experience.

The first object of the present invention is to eliminate such drawbacks of the conventional example.

Further, in the conventional example, since ratchet teeth and pawls were essential components, the structure was complicated and the manufacturing cost was high.

A second object of the invention is to correct this drawback.

A further object of the present invention is to provide a hub device that is compatible with coaster hub type hub devices, is easy to assemble, and is highly durable.

In order to achieve such an objective, the present invention takes the following technical measures.

That is, the inner helical shaft of the drive body, which has the sprocket on the outer periphery of its outer end, is extended into the driver body, and a clutch cone having a cone-shaped clutch outer surface on the outer periphery of the drive body is attached to the helical shaft. The hub body has a cone-shaped clutch inner surface that can come into contact with the clutch outer surface of the clutch cone on the outer inner surface of the hub body. A stopper is provided to prevent the clutch cone from falling inward from the screw shaft portion, and also urges the clutch cone in a direction away from the inner surface of the clutch of the hub body and causes the clutch cone to rotate. This is because a bullet was provided to provide resistance.

By providing a stopper inside the screw shaft, when the clutch cone is actively reversed to disengage the outer surface of the clutch cone latch and the inner surface of the clutch of the bubble body, the clutch cone is inadvertently driven. It can be prevented from coming off the helical shaft inside the body.

In addition, the clutch cone is equipped with a bullet for applying rotational resistance, and this clutch cone is constantly urged in a direction in which the outer surface of the clutch moves away from the inner surface of the clutch of the bubble body, so that the wheels can be adjusted correctly. It helps the clutch outer surface and the clutch inner surface to quickly separate when the clutch is trying to idle in the direction, and once the clutch outer surface and the clutch inner surface have separated from each other, even when pushing the bicycle backwards, for example. There is no possibility that the outer surface of the clutch and the inner surface of the clutch will come into contact again and the driving body or the pedal will be reversed.

All conventional bicycles have a structure in which the pedals reverse when pushed backwards as described above, and there was a problem that the reverse pedals could hit the opposite shin, but with the present invention. , this problem is solved by a simple configuration.

Embodiments of the present invention will be specifically described below with reference to the drawings.

1 is a shaft that is fixed to a frame (not shown) by left and right fastening nuts (2t2), and the fixing member 3 and the ball pushing member 4 are screwed on the left and right sides.

Reference numeral 5 denotes a drive body having one or more sprockets 6 on its outer periphery, the tip 7 of which is inserted into a sprocket 8, and a right-handed screw 9 a'-shaped helical shaft portion is attached to the outer periphery of the tip 7. A stopper 10 is provided at the axially inner Q portion of the right-hand screw 9a.
to fasten.

This stopper 10 is for preventing the clutch cone 11 from being pulled out and falling in the axially inward direction Q, and can be formed using, for example, a washer 10a and a retaining ring 10b.

The clutch cone 11 forms a cone-shaped clutch outer surface 12a at the outer end thereof, and extends a considerable length toward the inner end to form an inner flange 13 at the inner end, while the inner peripheral surface is formed into a stepped cylindrical space. A screw 9b that is screwed into the right-hand screw 9a is screwed into the small diameter portion on the outer side thereof, and is screwed into the drive body tip 7 so as to be movable in the axial direction for reciprocating screw feeding. Ru.

A pair of left and right spoke supporting flanges 14.14 are fixed to the outer periphery of the brake body 8, and a cone-shaped clutch inner surface to which the clutch outer surface 12a of the clutch cone can be joined to the inner periphery of the outer portion thereof. 12b is formed.

The driving body 5 is provided with a group of hard balls 15 arranged between a ball receiving surface 15a on the peripheral surface of the driving body and a ball receiving surface 15b on the outer periphery of the ball pushing member.
The ball pushing member 4 is rotatably supported around a shaft 1, and the ball body 8 has ball receiving surfaces 16a and 17 on the inner circumference at both ends thereof.
Rotatably supported between the fixed member 3 and the driving body 5 through left and right steel ball groups 16 and 17 arranged between the ball receiving surface 16b at the tip of the fixed member and the ball receiving surface 17b on the outer periphery of the driving body. be done.

Reference numeral 18 indicates the direction in which the clutch cone 11 is axially inward, that is, the direction in which the clutch outer surface 12a of the clutch cone 11 is separated from the clutch inner surface 12b of the bubble body 8 (arrow Q in the figure).
The direction (direction) is a bullet that constantly biases the clutch cone 11 and applies sliding resistance to the clutch cone 11, for example, as shown in FIG.
A compression coil spring 18a interposed between a flanged nut 19 fixed to the hub shaft 1 and the inner flange 13 of the clutch cone 11 can be used.

20 is a lock nut that locks the flanged nut 19 so that its position can be adjusted.

Further, as shown in FIG. 2, the tip surface 21 of the clutch cone 11
It is also possible to use a compression coil spring 18b interposed between the drive body 50 and the stepped wall 22.

Note that a spring that biases the clutch cone 11 in the axially inward Q direction and a spring that provides sliding resistance to the clutch cone 11 are formed separately, and these are combined to constitute the elastic machine 18. It's okay.

Next, the operation of the device of the present invention will be explained.

When the pedal (not shown) is rotated in the normal direction, the sprocket 6 is extended, and the drive body 5 is rotated in the normal direction, the clutch cone 11 also tries to rotate together with this, but the sliding resistance of the bullet 18 prevents this movement. Co-rotation is prevented, and the rotation of the drive body 50 is converted into an axially outward movement P of the clutch cone 11.

Due to this movement, the clutch cone 11 and the bubble body 8 are connected by joining the clutch outer surface 12a and the clutch inner surface 12b, and the forward rotation driving force of the drive body 5 is transmitted to the bubble body 8, and the rear wheel (not shown) is transmitted to the bubble body 8. move forward.

Incidentally, as the clutch cone 11 moves outward in the axial direction P, the compression coil spring (elastic spring) 18 is slightly compressed.

When the pedal is stopped and the drive body 5 is stopped, the bubble body 8
The rotational speed of is faster than that of clutch cone 11,
The clutch cone 11 is rotated in the opposite direction, and the clutch cone 11 moves slightly inward in the axial direction Q under the sliding resistance of the bullet 18, thereby releasing the connection between the latch surfaces 12a and 12b.

Moreover, the bullet 18 urges the clutch cone 11 toward the axial force Q, and both clutch surfaces 12a.

The bond of 12b is reliably released and that state is maintained.

In this way, the bubble body 8 and the clutch cone 11 are in a free state, but the same condition occurs when the forward rotational speed of the drive body 5 is smaller than that of the bubble body 8.

Further, when the pedal is reversed and the drive body 5 is reversed, the clutch cone 11 receives the sliding resistance of the bullet 18 and actively moves inward in the axial direction Q.

However, this movement is blocked by the stopper 10 at a certain position.

That is, in the illustrated example, the inner circumferential stepped shoulder portion 23 of the clutch cone 11 comes into contact with the stopper 10, thereby preventing the movement, and there is no possibility that the clutch cone 11 will fall out of the drive body 5.

Next, we will explain the case of pushing the bicycle by hand.

When moving the bicycle forward, the bubble body 8 and the clutch cone 11 are in a free state, similar to when the pedals are stopped, and the bicycle moves forward while the pedals are stopped, as in the conventional example.

Also, when backing up the bicycle by hand, the bullet 18
Due to the action of... the clutch outer surface 12a and the clutch inner surface 12b between the clutch cone 11 and the clutch cone 11 are slightly axially disposed between the right-hand screw 9a of the drive body 5 and the female screw 9b of the clutch cone 11 screwed thereto. They are forcibly separated from each other within the range of play, and as a result, the clutch cone 11 and the clutch cone 8 are in a free state, so the drive body 5 or the pedal does not reverse rotation.

It is an important feature of the present invention that the bicycle can be moved backwards while the pedals are stopped when pushing the bicycle by hand.

Since the present invention has a configuration and function similar to that of a diagonal, when backing up a bicycle by hand to store it indoors or in a garage, the work can be carried out with the pedals stopped, unlike the conventional example. It is possible to avoid an accident in which the opposite shin or the like is struck by a pedal that reverses.

Furthermore, the device of the present invention is compatible with the conventional freewheel type, unit type,
・Similar to the bubble type one-way power transmission mechanism, driving force can be transmitted to the bubble body only when the drive body rotates in the normal direction, and it can be in a free state when the drive body is stopped or reversed.

Moreover, unlike the conventional example, there is no need for ratchet teeth, pawls, etc., making it possible to simplify the structure, reduce the number of parts, and significantly reduce manufacturing costs.

Furthermore, the device of the present invention can use the main parts of conventional coasters almost as they are.

In other words, by removing the brake shoes of the conventional coaster knob,
If instead of this, a bullet such as a compression spring and a stopper are installed internally, the device of the present invention can be used as it is, which is a feature of the freewheel type.

1. It becomes possible to rotate the drive member in the reverse direction in a free state.

Furthermore, there is no compatibility in terms of wheels, spokes, etc. between the conventional freewheel type and coaster type bicycles, and it was impossible to convert a coaster type bicycle into a so-called freewheel type bicycle. According to the present invention, this can be done extremely easily.

Furthermore, since many of the component parts of the device of the present invention are common to those of the coaster, it is possible to manufacture large quantities of common parts.
From this aspect as well, manufacturing costs can be significantly reduced.

Further, according to the present invention, the following drawbacks of the conventional freewheel type can be corrected.

In other words, in the conventional freewheel type, there is a tuning work to optimize the rotation of the freewheel, and a tuning work to optimize the rotation of the bubble body after the freewheel is assembled into the bubble. However, in the device of the present invention, it is only necessary to perform adjustment work at the time of assembly, and the assembly work can be performed easily and quickly.

In addition, the conventional freewheel type had the disadvantage that water, dirt, etc. easily entered the ratchet mechanism, which interfered with power transmission and caused frequent failures, but the power transmission part of the present invention Because of this, there are no such drawbacks and the performance can always be maintained in good condition.

In addition, in the conventional freewheel type, it was not possible to use high viscosity lubricating oil in the ratchet mechanism, but since the present invention does not have a ratchet mechanism, high viscosity lubricating oil can be used, and the drive power transmission rotation is always maintained. This can be carried out smoothly and the rust prevention effect can be enhanced.

Furthermore, in the conventional freewheel type, it was difficult to lower the minimum number of teeth of the sprocket due to structural constraints, but according to the present invention, the sprocket can be directly fixed to the driving member, so this limit number of teeth can be lowered. Is possible.

The present invention allows the pedals to be kept in a stopped state when backing up the bicycle by hand, making it easy and safe to store the bicycle, as well as simplifying the structure and parts compared to the conventional example. It is possible to reduce the number of parts, have compatibility with coaster-hub type products, be easy to assemble, be highly durable, and have low manufacturing costs.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway front view thereof, and FIG. 2 is a partially cutaway front view of another embodiment. DESCRIPTION OF SYMBOLS 1... Shaft, 3... Fixing member, 5... Drive body, 6... Sprocket, 7... Tip of drive body, 8
...Body, 10...Stopper, 11...Clutch cone, 12a. 12b...Clutch surface, 18...Bullet machine.

Claims (1)

[Claims] 1. The inner helical shaft of the drive body, which has a sprocket on the outer periphery of the outer end, is extended into the pull body, and the clutch cone, which has a cone-shaped clutch outer surface on the outer periphery, is reciprocated on the helical shaft. The hub body has a cone-shaped inner surface of the clutch capable of contacting the clutch outer surface of the clutch cone on the outer inner surface of the hub body, and the clutch is screwed onto the inner surface of the screw shaft. A stopper is provided to prevent the cone from falling inward from the screw shaft, and it also biases the clutch cone in a direction away from the inner surface of the clutch of the hub body and provides rotational resistance to the clutch cone. A device for transmitting one-way power in a rotating turret, characterized by being equipped with a projector for imparting power.