JPS59175637A - Unit hub for bicycle - Google Patents

Abstract

PURPOSE:To have sharp declutching by providing a ridge at the inside surface of a clutch cone, placing a frictional member in engagement with this ridge, setting a spring in contact with said frictional member, and by energizing the clutch cone in such a direction as separating from the clutch inner surface. CONSTITUTION:A ridge 23 is provided at the inside surface of a clutch cone 6, and a frictional member 22 is placed in engagement with this ridge 23, which is butted to one of the ends of a spring 21 so that the clutch cone 6 is energized in the direction as separating from the clutch inner surface 19. In the mode in which the drive force to rotate a driving member 4 reversely is released, when a screw shaft 7 of said driving member 4 makes relative reverse rotation with respect to the clutch cone 6, the resilient force of the above-mentioned spring 21 will support the clutch cone 6 being screw fed in the direction as separating from the clutch inner face 19 of hub 1. Thus declutching will be made much clearly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a unit hub, and more specifically, the present invention relates to a unit hub, and more particularly, a unidirectional rotation transmission mechanism that allows a hub body to rotate in only one direction with respect to a drive body equipped with a small sprocket ear, and a drive unit hub. The present invention relates to an improvement in a bicycle hub in which a bearing mechanism for freely rotatably supporting a hub structure including a hub body with respect to a hub axle is integrated into a unit.

The conventional general fj purchase for unit hubs is J-K5D9.
4] shown in 9. Comparing this with the structure of a normal freewheel hub, which consists of a separately formed freewheel attached to the body of one hub, the unit hub is the core of the freewheel in a hub with a freewheel. The general structure is such that the body and the hub body are integrated. By doing this, the unit hub can simplify the mechanism and manufacture compared to a hub with a freewheel. However, the sprocket is provided, λ is a one-way rotation transmission mechanism for transmitting the driving force of the driving body to the hub body in only one direction, and T is the rachi end installed on the inner periphery of the driving body. It uses a so-called ratchet mechanism consisting of teeth and a ratchet pawl that is partially embedded in the core, and this mechanism is still quite complex.
I do t+.

For this reason, various unit hubs have been proposed in which the ratchet mechanism, which is a one-way rotation transmission mechanism, in the above-mentioned general unit hub is changed to a simple one using a kite friction clutch (Japanese Utility Model Publication No. 57-78F3A, Jitsukai 51st year
-6.3156, Japanese Patent Application Laid-open No. 5]-69847, etc.).

These unit hubs have a conical clutch inner surface on the inner circumferential surface of the right end (as viewed from the rear of the bicycle) of the hub body, and are screwed onto a helical shaft portion in the inwardly extending portion of the drive body that extends ωII from the sprocket. It is generally constructed by providing a clutch cone shaped like a truncated cone on the outer periphery of a clutch cone which is movable in the hub axis direction. Furthermore, the clutch cone is interposed between the clutch cone and the clutch shaft or between the clutch cone and the clutch cone.
Provides a constant resistance λ to rotation relative to the hub axle or hub body
There is one. In this configuration, when the Y drive body is rotated in the forward direction (clockwise from the right side of the bicycle, the same applies hereinafter) via the drive chain and the sub-wheel drive by stepping on the petal crank, the frictional resistance as described above is caused. The clutch cone, which rotates with respect to the hub axle due to the rotation of F When the inward clutches connect with each other and the rotational force of the drive body is transmitted to the Hough body, on the other hand, when the drive body is reversed (counterclockwise when viewed from the right side of the bicycle, hereinafter the same), the clutch cone reverses the above. The screw shaft 2 in the state is twisted in the direction away from the inner surface of the clutch AU, the inner surface of the clutch and the outer surface of the clutch iii are separated from each other, and the clutch C is disengaged. A clutch device consisting of a clutch cone that moves in the hub axis direction by the rotation of a drive body and a clutch outer surface formed on the outer periphery of the clutch cone is similar to that of a conventional hub with a freewheel. Although it has a one-way rotation transmission function similar to a ratchet mechanism, the unit hub using the above-described clutch device has the following problem regarding latch disconnection.

K that reliably transmits the powerful fS rotating blade of the drive body to the knob body.
13. It is necessary to obtain sufficient frictional force by making the inclinations of the inward and outward curves of the clutch fairly gentle and increasing the contact pressure between both clutch surfaces due to the wedge effect when the two clutch surfaces are brought into contact. However, if the rotational force of the drive body becomes too strong, the outer side of the clutch wedges into the inner side of the clutch and becomes separated, causing the drive body to rotate one turn in the opposite direction with respect to the knob body. 1 for driving body π
Free forward rotation may not be possible. One way to avoid this kind of interference phenomenon between the latch inner surface and the clutch outer curve is to cut the taper (Ill) on both clutch surfaces, but if this is done, both latch curves will be Due to the lack of contact surface pressure during joining or the frictional force generated by this, the hub body f is able to sufficiently transmit the rotational driving force of 1tlI.
Alternatively, by interposing a spiral-shaped spring between the clutch cone and the Huff body, this spring has only the function of increasing a certain resistance to rotation of the clutch cone relative to the Huff shaft or hub body. Focusing on this, we combined the function of constantly urging the clutch cone in the direction away from the clutch cone on the pub body side to improve clutch disengagement with the spring for providing resistance to the rotation of the clutch cone with respect to the hub shaft. I came up with the idea of having them all.

That is, the present invention provides a truncated conical clutch inner surface on the inner periphery of the hub body or a member integrally connected thereto, and the clutch is screwed onto a threaded shaft portion provided on a drive body equipped with a sprocket. 191" is marked on the outer periphery of the hinged clutch cone, which is threaded in the direction of the hub axis. When the drive body is reversed with respect to the huff body, The clutch cone is elastically biased by a spring in the direction away from the inner surface of the clutch on the hub body side, and the same spring The purpose is to provide frictional resistance to the rotation of the clutch cone.

In order to achieve this objective, the present invention takes the following technical measures. That is, a protrusion is provided around the inner periphery of the clutch cone, and one end of the spring is indirectly and elastically held on the side surface of the protrusion through a surface or a friction bar. . In this case, the spring biases the hub body, which is a clutch cone, in a direction that separates it from the inner surface of the clutch. You can use either a compression spring or a tension spring 2 for the spring T.

Hidden 1. Since the friction part of the buff/flush is in elastic sliding contact with the protrusion of the clutch cone, a constant frictional resistance is applied to the rotation of the clutch cone, and at the same time, this clutch cone C1 VCfi is always elastically biased in the direction away from the inner surface of the clutch of the hub body. Therefore, when the drive body is driven to rotate in the forward direction, the clutch cone rotates relative to the hub body due to the frictional resistance, and K << fi
Because of this, the screw shaft of the drive body rotates in the normal direction relative to the clutch cone, and the clutch cone is fed along this screw shaft until it adheres to the inner surface of the clutch of the hub body. On the other hand, when releasing the driving force to reverse the driving body (1), the clutch cone is elastically biased in the direction away from the inner surface of the clutch of the rehabilitated body by the nU bar 2, so the screw shaft of the driving body When the clutch cone is rotated in a relative reverse direction, the elasticity of the spring supports the screwing of the clutch cone in the direction away from the inner surface of the clutch of the hub body, resulting in very good clutch disengagement.

As described above, in the present invention, the present invention has a feature of applying elasticity to the lap cone that constantly acts in the direction away from the inner surface of the clutch of the hub body, which does not exist in the past, and is completely different from the common sense in friction clutches. By adopting the opposite idea, we have solved the above-mentioned problems in the conventional Yuzu unit hub with an extremely simple μ configuration.

Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

In Figure 1) (1) is a hub body, (2) is a Hough body (1
), the clutch member is fixed to the inner periphery of the enlarged diameter part (, 3) at the right end so as not to be screwed.
``T:l'7'' (This includes both the so-called single sprocket, which consists of only one sprocket, and the so-called multi-stage sprocket, which consists of multiple sprockets with different numbers of meters arranged side by side) (5). A driving body equipped with
(6) is a spiral portion (
Fig. 7 shows clutch cones that are screwed together with 7.1) and can be reciprocated in the hub axis direction by rotation 1 of the drive body (4).

The driving body (4) is formed on its outer inner circumference and has a j-one (8
) and a cone flOi screwed onto the hub axle (9).
By interposing the steel ball till between the Vc transferable and the Hough shaft (9), the hub body (1) or the clutch member ( 2) consists of a wand (12) provided on the inner periphery of the left end of the hub body (1) and a cone 13 fitted over the hub axle (9).
) and between the ball receiver (14+) formed on the outer inner periphery of the clutch member 02+ and the sprocket (
The ball bearing formed on the inner shoulder of 5) has a steel ball [171061 inserted between the surfaces (15) and 7, respectively, so that the ball bearing is also connected to the hub shaft (9) and the drive body +41K. Also has relative rotation capability, 17. However, due to the one-way rotation transmission mechanism (181) described below, the hub body (1
) is relative to the driving body (4) f so that it does not rotate relative to the driving body (4). That is, the driving force hub body (1) l/i moves the iJ of the driving body (4) ``Relative reversal force is not transmitted, so even if the drive body (4) is reversed or stops rotating while the bicycle is running, the Hough body (1) will not be affected by this and will be free. 6C one-way rotation transmission mechanism (18+ is the clutch member (2
) and the outer periphery of the O-clutch cone (6). Inside the truncated cone-shaped clutch that fits into each other in a male-female manner...] (19
1 and the outside of the clutch [l11 (2U), and the clutch cone (2) or the screw shaft (7) of the drive body +41
'' is generally configured by allowing the screw to be reciprocated and threaded in the direction of the axis of the knob. The screw shaft (7) is right-handed and f
When the driving body (4) or the clutch cone (6) rotates in the normal direction, the clutch cone (6) is sent in the direction of the arrow P in the figure, and the clutch outer surface (20) and the inside of the clutch [ 11109) are connected to each other.On the other hand, when the drive body (4) or the clutch cone (6) is reversed once, the clutch cone (6) is sent in one direction of the arrow Q in Figure J, and the clutch outside m (20+ and the clutch inside 09) move away from each other.

The text of this embodiment is that there are ratchet tooth-shaped engaging portions [2bl (26)] on the inner side of the clutch and on the outer side of the clutch [111 (aj K), which engage with each other and are oriented in opposite directions. Description will be made based on FIGS. 2a to 4.

Ifli (19
1 and the inclination angle fli of the taper of the clutch outer surface T20)
[Conventionally] fJ should be larger than that of this glazed clutch device, and it is preferable that JKi be about 30° or more. In the illustrated example, the angle is set to 14.5 degrees. As shown in FIG. In addition, as shown in FIG. Ratchet tooth-shaped engaging portions C6+, which are inclined and then stepped inward in the radial direction, are provided at some places.

If FIG. 8 and FIG. 4 are considered superimposed, it will be understood that relative reverse rotation of the clutch member (2) with respect to the clutch cone (6) is not permitted, but relative normal rotation is permitted. rl Oh, these interlocking parts l c! Contrary to the illustrated example, 6+ has engaging portions of the clutch inner surface 09) provided here and there, while the clutch outer surface (engaging portion +26 of 2u+) is provided here and there.
1 consecutively - (or both (251 (26i
Both may be provided consecutively. Also, the cross-sectional shape of the engaging part is I
In addition to the dovetail shape as shown in the X example, various other embodiments can be considered, such as an aquiline shape in which the inclined surface, inner circumferential surface, and stepped portion are continuous.

In the present invention, in the basic configuration of the unit hub as described above, T biases the clutch cone (6) away from the clutch inner surface Q9 by a spring, that is, in the direction of the arrow Q in the figure. At the same time, the same spring provides a constant frictional resistance to the rotation of the clutch cone (6).

In this embodiment, a cylindrical space is provided between the inner hole t27+ of the screw shaft portion (7) of the driver (4) and the hub shaft (9), and a nozzle is provided in this space.・vc axis f9)
A T compression coil spring 011 is inserted so as to insert the clutch cone (6) in the direction Q of Fig. J using this compression coil spring (21).
1 to give frictional resistance λ.

The outer end of this spring coil spring is 1.
The inner end (2) a of A retaining portion (29) of a donut disc-shaped friction plate (22) fitted in a freely movable manner.
i K engaged 1.

-, the inner circumference f of the inner cylindrical part of the clutch cone (6) is
The friction plate 02+ is pressed by the compression coil spring 21) so as to come into elastic contact with the outer surface (23a) of the retaining ring (23i), which is a projection and is fitted into the retaining ring (23i). Therefore, the clutch cone (6) is always biased in the direction of arrow Q in the figure by the compression coil spring (21) through the friction plate (221). Also, the outer end of the compression coil spring (2) is Since it is elastically wound around the hub axle (9), the friction plate is attached to the inner end (2] a) of this spring (21), and the friction plate is in principle attached to the hub axle. Relative rotation to R, H.Folding spring (21)
Only a slight amount of oscillation is allowed due to the elastic deformation of. Therefore, this friction plate (the cause of the protrusion for 22+) is caused by the clutch cone (6
) is prevented from rotating with respect to the hub shaft (9) K due to the frictional force generated at the sliding contact between the shape and the friction plate @. The magnitude of this resistance can be determined by adjusting the elasticity of the compression coil spring (1) or by adjusting the elasticity of the retaining ring (1).
The Km can be easily adjusted by changing the inner diameter of 23+ (9 threads) or adjusting the product of sliding contact between ) and friction & (22+) of this retaining ring.

In addition to making the outer end of the compression coil spring suction j wind around the hub @II (9) VC elastically as in this embodiment, an appropriate engaging part is provided on the ball pusher 00) to connect it to the hub. It is also possible not to engage it.

Furthermore, in this embodiment, the first friction plate (221)
By providing a compression coil spring on the right side of the figure, this friction plate (support) is elastically pushed in the direction of the force marked Q in the figure. ffLT may also be used to elastically pull this friction plate in the direction of arrow Q in FIG. 1 by providing a 71 tension coil spring (not shown).

Furthermore, the friction plate (support)) is omitted, and the inner end of the compression coil spring 21+ in the figure is connected to the retaining ring f2 of the clutch cone (6).
3+ Expand the diameter to the point where K is engaged and this part is used as a retaining ring)
Further, in the illustrated example, the protrusion may be formed by a retaining ring F+, or alternatively, the protrusion may be formed by integrally forming the protrusion with the clutch cone.

In addition, the reference numeral (2) in the figure indicates a stopper formed at the deep inner circumference of the VC clutch member (2) to prevent the clutch cone (6) from moving inward. Use a retaining ring.

Next, the operation of the unit hub of this embodiment will be explained. 6th
The figure shows the state in which the clutch cone (6) has moved most inwardly. At this time, the inside of the clutch ili]]09) and the outside of the clutch jIn (2 Pedal fJ wheel drive body (
It is also possible to coast while the bicycle is stopped, or it is also possible to actively reverse the pedal or drive body (4) while the bicycle is running or when the bicycle is stopped. At this time, the clutch cone (6) is stopped from moving in the direction of arrow Q by the stopper (241vC), so it is tilted toward the drive body.

When the driver (4) is driven forward by pressing the pedal, the clutch cone (6) is given a certain resistance λ1 to rotation relative to the hub axle (9) K, so the driver (4) is driven by the clutch cone (4). (6) The screw shaft (7) of the drive body (4) is rotated relative to K, and the T clutch cone T61 is in a normal rotation state.
) in the direction of arrow P, and the clutch outer surface Cυ)
and the clutch outside curve 09) are engaged (Fig. 1) 0 When the clutch outside [fII (5)) and the clutch inside [I It starts co-rotating with the drive body (4), and both clutch surfaces 1191 (20+ +-t
When the engaging part l (26i engages with the clutch cone (6), the clutch cone (6) or the clutch member (19i) has a clutch cone (6) that rotates in the forward direction. (2) Rotate the hub body (1) at the same speed, thereby accelerating the bicycle in the forward direction.

Clutch outside 11]] 12tj+ to clutch inside (9)
Transmission of the rotational force to is carried out by the engagement of the engaging portions □)C6) of the two, so that slipping is reliably carried out.

On the other hand, in the driving running state shown in FIG. 1, when the pedal is stopped to stop the driving body [41],
41 K, the hub body (1) is in a state of normal rotation relative to , the clutch cone (6) is forcibly pressed against the hub body (11
) and rotate forward in the direction of arrow Q on the screw shaft (7) of the drive body (4). When the engagement of the clutch inner curve 19+ and the clutch outer curve (20) is released, the clutch is fully activated. It can be cut into

In this case, the clutch cone (6) is constantly pushed in the direction of the arrow Q in Figure 1 by the compression cone lever (21), so the cone (6) is rotated relative to the screw shaft (7) in the opposite direction. Compared to being sent in the P direction, there is less resistance in the direction of relative forward rotation as described above and in the direction of the arrow Q. I'm so excited (,
The above-mentioned co-rotation and forward rotation are performed extremely smoothly, and clutch disengagement is very easy.

Even when the pedal is reversed from the state shown in Fig. 1 to actively reverse the driving body (4), the clutch cone (6) is moved by the action of the compression coil spring (21).
Since a certain resistance is applied to the reverse rotation of the hub shaft (9) and the upward force is always applied in the direction of arrow Q in Fig. 1, the spiral shaft (7) reverses more smoothly than the conventional example.
The upper part is screwed in the direction of arrow Q in Figure 1, and the clutch disengages very well.

As described above, in the present invention, in the unit hub in which the circular clutch outer curve in the shape of M is pressed against the conical inner surface of the clutch, rotational force can be transmitted by the frictional force generated thereby. Fukagawa's completely new concept of elastically biasing a clutch cone with an outer clutch surface in a direction in which the outer cone of the clutch moves away from the inner surface of the clutch prevents clutch disconnection when the drive body is reversed relative to the hub body. It has the unique effect of being able to significantly improve the performance compared to conventional methods. Furthermore, as mentioned above, the spring that biases the clutch cone also has the function of applying frictional resistance so that it becomes difficult for the clutch cone to rotate relative to the hub shaft. , the structure is simple and the cost increase is l
In addition, in the example f shown in VK, the clutch inner surface, the clutch outer curve, the L ma, the inclination at the chi/ are steep, and each is provided with a latch tooth-shaped engagement part. In the present invention, there is a point Ku at this point, so fi<,
(The inner surface of the clutch and the outer surface of the clutch are as described in each publication listed at the beginning.
NIt is possible to bend the inside of a conventional general clutch and the outside of the clutch at the chain part0

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and Figure C is a partially sectional view;
Figure 2a is a partial cross-sectional view of the clutch cone, Figure 2b is a partial cross-sectional view W1 of the clutch member, Figure 2c is a partial cross-sectional view of the drive body, and Figures 2 and 3 are ■-■ of Figure 2a. 4 is a cross-sectional view taken along the line IV-■ in FIG. 2b, FIG. (1) Hub body (2) (Clutch) member (4) Drive body (5) Sprocket (6) - Clutch cone (7) Spiral shaft 091- Inside the clamper [
fIJf2++
([+shrinkage coil) Bi 122+...Friction member (friction plate) Capture...projection (JI ring) Applicant Maeda Kogyo Co., Ltd. Agent Patent attorney Yutaka Higuchi Osamu and 2 others

Claims (1)

[Claims] (1) A truncated conical clutch inner surface is provided on the inner periphery of the hub body or a member that is integrally connected thereto, and the clutch is screwed in the threaded part provided on the drive body equipped with one sprocket so as to be screwed in the hub axial direction. In the bicycle unit hub, the outer periphery of the clutch cone to be fed is provided with a clutch outer surface that can be connected to the inner surface of the clutch, and the inner periphery of the clutch cone is provided with an "f14f" strip, and this protrusion is connected to a friction member. By pressing the clutch cone 4iJ elastically through or directly with a spring, the clutch cone described in 4 i A unit hub for stone bicycles that features a λ-shaped structure.