JPS6126152Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention involves attaching a rotating body such as a drum or disk that rotates together with the hub to the hub, and controlling the braking member by contacting the rotating body with a braking member such as a brake arm, brake shoe, or brake pad. This article relates to a bicycle brake designed to perform the following functions.

Conventionally, in this type of bicycle brake,
The rotating body was screwed onto the hub, and a lock nut was used to prevent the rotating body from loosening. Therefore, when braking is repeated during forward movement, the rotating body is gradually screwed in by the torque in the forward direction of the hub, and when removing the rotating body from the hub due to broken spokes, etc., a special tool is required. In many cases, even when a considerably large return torque was applied during use, the screw fitting between the two did not loosen, making it difficult to remove the rotating body.

However, if the rotating body is not fully screwed in, if the bicycle is repeatedly braked when moving forward and backward immediately after installing the rotating body, the braking during forward movement will automatically When the rotating body is screwed into the nut, a gap is created between the rotating body and the lock nut, which is the same as when the lock nut becomes loose.However, the lock nut may come off due to vibrations during driving, or abnormal noises may occur. It could also be the cause.

In view of these circumstances, the present invention provides a bicycle brake that does not cause the risk of loosening of the rotating body and allows easy attachment and detachment of the rotating body in the event of broken spokes, etc. A cylindrical boss is provided at the center of the body, the boss is attached to the end circumference of the hub by fitting a spline, and a heat sink having a large number of fins is formed, and the heat sink is attached to the outside of the rotating body. The heat dissipation plate is provided with a mounting plate facing toward the center of the rotating body, and the mounting plate is detachably fixed to the end face of the hub.

An example of the present invention will be described based on the drawings.
The drawing shows a bicycle in which a drum-shaped rotating body 2 that rotates together with the hub 1 is attached to a hub 1 of the bicycle, and a braking member 3 consisting of a brake shoe is brought into contact with the outer peripheral surface of the rotating body 2 to perform braking. Shows brakes for use. 4 is a fixed arm that has one end attached to the hub axle 5 and the other end attached to the chain stay 6 of the bicycle frame via a tightening band 7; 8 and 9 are a pair provided opposite to the outer peripheral surface of the rotating body 2; With the brake arm of
The proximal ends are pivotally connected to each other by pin _P1 ,
The tip of one brake arm 8 is pivotally supported to the fixed arm 4 via the same pin P ₂ as the intermediate portion of the operating arm 10, and the tip of the other brake arm 9 is connected to the pin P ₂ . It is pivotally connected to one end of the operating arm 10 via a long hole 11.
An inner wire 12 is attached to the other end of the operating arm 10.
An adjustment bolt 15 that supports one end of the outer cable 14 is screwed onto an outer receiving piece 13 that is connected to one end and is connected to the fixed arm 4. By pulling the wire 12 and swinging the operating arm 10 around the pin _P2 against the spring 16, both brake arms 8 and 9 swing in the direction toward each other and are attached to the arms 8 and 9. The braking member 3 is configured to come into contact with the outer peripheral surface of the rotating body 2.

In the bicycle brake having such a configuration, when the rotating body 2 is attached to the hub 1, the third
As shown in the figure, a ball holder 1 at one end of the hub 1
A spline groove 20 is formed on the outer circumferential surface of a cylindrical body 19 which is fixed to the cylindrical body 19 and rotated together with the ball receiver 17 and the hub body 18. A spline groove is also formed on the inner circumferential surface of the boss 21, and a heat sink 22 is formed with a large number of fins 22a that efficiently release the frictional heat of the rotating body 2 generated during braking into the atmosphere.
The heat sink 22 is attached to the outer side of the rotating body 2 with bolts 2.
5, a center side portion of the heat sink 22 is extended to a position closer to the center than the boss 21 to form a mounting plate 30, and the boss 21 is spline-fitted to the cylindrical body 19 of the hub 1. In this state, the mounting plate 30 is attached to an annular side wall portion 2 bent toward the center and formed at the outer end of the cylindrical body 19 in the axial direction.
3, it is configured to be detachably attached using a screw 24 which is screwed into a screw hole 28 provided in the side wall portion 23. Reference numeral 26 denotes a hub collar bent at the outer end of the cylindrical body 19 in the axial direction, and has a spoke attachment hole 27 therein.

FIG. 4 shows the fitting portion between the mounting plate 30 and the annular side wall portion 23 of the cylinder body 19 using the screws 24, and the screw hole 28 of the mounting plate 30 is formed into a spring hole or a long hole elongated in the hub rotation direction. However, a spring washer 29 is interposed between the outer peripheral surface of the oblong or long screw hole 28 and the head of the screw 24.

With this configuration, even if a relative rotation occurs due to the fitting clearance between the rotary body 2 and the boss 24 after the rotating body 2 is fitted into the boss 24, no shearing force is applied to the screw 24, which increases the strength of the screw 24. can be small.

Therefore, the present invention is constructed as described above, and the boss 21 of the rotating body 2 is spline-fitted to the outer periphery of the cylinder 19, and the mounting plate 30 is detachably fixed to the current side wall portion 23 of the cylinder 19 with screws 24. In order to prevent the spline fitting from coming off, the rotating body is screwed into the hub and secured with a lock nut, and this phenomenon occurs where the rotating body is automatically screwed in by the torque of the hub when braking during forward movement. Without,
The rotating body 2 can be easily attached and detached.

Furthermore, the spline fitting portion between the rotating body boss 21 and the cylindrical body 19 naturally has a fitting clearance necessary for the fitting operation, but since the screw hole 28 is a blank hole or an elongated hole, the above-mentioned Since the screw 24 is loose with respect to the mounting plate 30 within a certain range at least in the rotational direction, torque transmission between the hub 1 and the rotating body 2 is not affected by the existence of the flexibility gap in the spline fitting part. Since this is always done only through the spline fitting portion and no shearing force is applied to the screw 24, there is no risk of breakage even if a small diameter screw 24 is used.

In the above embodiment, the mounting plate 30 is formed integrally with the finned heat sink 22, but it may be formed separately. In addition, the braking member 3 is constituted by a brake shoe that can be freely attached to and detached from the brake arms 8 and 9, but the brake arms 8 and 9 are provided with arc-shaped contact surfaces that contact the outer peripheral surface of the rotating body 2. Alternatively, part of the brake arms 8, 9 themselves may be configured as the braking member 3.

FIG. 5 shows an embodiment in which the present invention is applied to a desk bicycle brake, and is similar to the previously described embodiment in that the rotating body 2 is disc-shaped and the braking member 3 is composed of a pair of brake pads. Differently, the spline fitting of the boss 21 of the disc-shaped rotating body 2 to the cylinder body 19, the screw 24 fixing of the mounting plate 30 to the annular side wall portion 23 of the cylinder body 19, etc.
This embodiment is substantially the same as the previously described embodiment.

Therefore, the same reference numerals are given to the same constituent members, and the explanation thereof will be omitted.

FIG. 6 shows another embodiment. What is shown in FIG. 6 is a case where the ball holder 17 of the hub 1 and the hub collar 26 are formed into a thick cylindrical body 19 integrally formed by casting or the like, and the side wall portion 23 is not provided. , the mounting plate 22 is fixed to the end surface of the thick-walled cylindrical body 19 with screws 24.

As described above, according to the present invention, a cylindrical boss is provided at the center of the rotating body, the boss is attached to the end circumference of the hub by spline fitting, and a heat sink having a large number of fins is installed. The heat dissipation plate is fixed to the outer circumference of the rotating body, and the heat dissipation plate is provided with a mounting plate facing toward the center of the rotary body, and the mounting plate is detachably fixed to the end surface of the hub. Unlike the conventional mechanism in which the rotating body is screwed into the hub and secured with a lock nut, the rotating body is automatically screwed in by the torque of the hub during braking, and the rotating body and hub are automatically screwed together. There is no risk of inconveniences such as a stalemate or the lock nut becoming loose, making abnormal noises, or causing the lock nut to fall out. Therefore,
This prevents the rotating body from becoming loose and allows the rotating body to be easily attached and removed in the event of a broken spoke or the like.

Furthermore, since a heat dissipation plate with a large number of fins is fixed to the outside of the rotating body, even when braking is frequently performed, such as when driving downhill, the frictional heat generated during braking is efficiently transferred to the atmosphere. Therefore, even if high-temperature frictional radiation occurs at the contact area between the rotary body and the braking member, for example when driving down a long downhill while braking, seizure at the contact area can be prevented and the vehicle can be driven for a long time. Braking performance can be maintained well over a period of time.

Moreover, since the mounting plate provided on the heat dissipation plate is formed so as to face toward the center of the rotary body, this mounting plate is freely rotatably supported by the hub axle of the hub and the hub axle via a bearing. It can be disposed in a dead space between the hub body and the hub body, and fixed to the end face of the hub. Therefore, it is possible to reliably prevent the rotating body from moving in the axial direction, and to prevent the rotation body from moving in the axial direction. While it can be easily fixed, it is possible to prevent the overall size from increasing due to the provision of the mounting plate, and it can be made smaller and lighter.

[Brief explanation of the drawing]

The drawings illustrate aspects of an embodiment of the bicycle brake according to the present invention, in which Fig. 1 is a side view, Fig. 2 is a side view showing the brake arm etc., Fig. 3 is a vertical front view, and Fig. 4 is a side view. Enlarged view of main parts in Figure 3, Figures 5 and 6
The figures are longitudinal sectional front views showing different embodiments. 1... Hub, 2... Rotating body, 3... Braking member,
21...Boss, 22...Mounting plate.

Claims (1)

[Scope of utility model registration request] A rotating body that rotates together with the hub is attached to the hub,
A bicycle brake that performs braking by bringing a braking member into contact with the rotating body, wherein a cylindrical boss is provided at the center of the rotating body, and the boss is spline-fitted to the end circumference of the hub. At the same time, a heat dissipation plate having a large number of fins is formed and the heat dissipation plate is fixed to the outer side of the rotating body, and a mounting plate facing toward the center of the rotary body is provided on the heat dissipation plate, and the mounting plate A bicycle brake, characterized in that the brake is detachably fixed to the end face of the hub.