JPS62253590A - Brake gear for bicycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a brake device for a bicycle, and more particularly, to a brake device having a brake lever pivotally attached to a bracket, a brake actuated by the brake lever, and a brake lever that is operated by the brake lever. The present invention relates to a bicycle braking device comprising an operating wire that transmits an operation to an operating piece of the brake.

(Prior Art) Conventionally, a bicycle braking device consisting of a brake lever and a brake operated by the brake lever has been known as shown in Japanese Utility Model Publication No. 55-23009, for example, in a caliper brake. A brake spring is provided between the brake arms to move the brake arms back from the operating position to the return position, and after the brake lever is released, the brake spring moves the brake arms back to the return position, and the brake The brake lever is moved back from the operating position to the return position via an operating wire connecting the arm and the brake lever.

In other words, in all conventionally known braking devices, a return brake spring is provided only on the brake side, and the return brake spring returns the operating piece such as the brake arm of the brake and also returns the brake lever. It is structured as follows.

However, the return brake spring takes into account that the transmission efficiency of the operation wire decreases with long-term use, and even if the transmission efficiency decreases to, for example, 35!4, the brake lever does not move from the operating position to the return position. It uses a large spring force (usually 4 kg) that moves back and forth.

(Problems to be Solved by the Invention) As described above, in the conventional structure, the brake lever is also moved back by the brake spring, so when the transmission efficiency (λW) of the operation wire is good, for example, 65%, , assuming that the spring operating efficiency (λA) is 80% and the lever ratio (R) is 4.5, the lever attraction force is 1709? for a 4 kg brake spring. On the other hand, if the transmission efficiency (λW) of the wire decreases to 35%, then 3175? Therefore, even if the transmission efficiency (λW) of the operation wire is good, it not only becomes heavy, but also the transmission efficiency (λW)
There was a problem that became even heavier as the weight decreased.

By the way, there is a need for a braking device that can be operated more easily than before, but in the caliper brake described above, the spring force of the brake spring is set to 4 kg, and the lever pulling force is 1.7 kg as a standard. When we tried a sensory test on a large number of people, we found out that all of them responded to the test.
900? This 900? I feel light below 9
00? They found that when the value exceeds the value, there is no significant difference compared to the standard value.

We also investigated the lever reaction force, that is, the return force of the lever when the input to the lever is released after operation, and found that it was <100? They also discovered that the smaller the wheel, the more uneasy it feels, and the feeling of braking becomes worse.

An object of the present invention is to use a lever spring for a brake lever that moves the lever back from an operating position to a return position, and to reduce the spring force of the brake spring used for the brake compared to the conventional example, and to make it not only new but also new. , the transmission efficiency of the wire is 3
Even when the brake force decreases to 5%, the lever attraction force is reduced to enable a light braking operation, and the lever return force is kept above a predetermined level so that the braking feeling does not deteriorate.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a brake lever (4) pivotally connected to a bracket (3), and an actuating piece (
11, 12), and a brake (10) operated by the brake lever (4) and the brake lever (4).
) of the brake (10).
), a lever spring (8) for returning the brake lever (4) from the actuation position a to the return position, and the actuation piece (11, 12) is provided with a brake spring (18) that moves the brake lever (12) back from the operating position to the return position, the lever ratio (a/b) of the brake lever (4) is 4.5, and the brake spring operating efficiency (λA) is 80. %, lever spring actuation efficiency (
λB) is 85%, the operating wire (20
) when the transmission efficiency (λW) of the lever ( ) is 35%, the lever (
Is the lever pulling force (Fl) in 4) 900? The lever return force (F2) is 100? In order to achieve the above, the spring force (K,) of the brake spring (18) is reduced to 1
．． The spring force of the lever spring (8) (
K2) is set based on the set spring force of the brake spring (18).

(Function) The brake lever (4) is equipped with a lever spring (8) that moves the lever (4) back from the operating position to the return position, and the actuating pieces (11, 12) of the brake (10) are moved to the operating position. The spring force of the brake spring (8) that moves back to the return position from 1. 100? The transmission efficiency (λW) of the operating wire (20) for the pulling force of the lever (4) is 35% as follows.
Even if it drops to 900? Because of the following, it is possible to perform light braking operations at all times, and the lever spring (
Since the spring force of 8) is set based on the set spring force of the brake spring (8), the return force of the brake lever (4) is also 100? This allows for better braking feeling.

(Example) The one shown in Fig. 1 includes a band member (1) and a tightening body (2) screwed onto the band member (1) on the curved rod portion (h) of the drop handle (H). A bracket (3) is fixed through the bracket (3), and the base (4) of the brake lever (4) having a base (41) and an operating part (42) is attached to the bracket (3).
1) is supported to swing freely via a lever shaft (5), and a side-pull type caliber brake (10) is used as a brake.

The bracket (3) is formed to have a rectangular cross section with an inner cavity (3a), an intermediate wall (3b) is provided in the interior cavity (3a), and the clamping body is attached to the intermediate wall (3b). An outer tube (21) into which the operation wire (20) connecting the brake lever (4) and the brake (10) is inserted and which guides the wire (20) is inserted and supported.
It receives the receptor (6).

The bracket (3) fixes the tightening body (2) to the handle (H) by screwing it into a nut (7) that is coupled to the band member (1).

Further, the brake lever (4) is connected to the base (41).
is swingably supported via the lever shaft (5) on a support wall (3c) projecting upward from the intermediate wall (3b) of the bracket (3), and the base (41)
A hook (43) for receiving a fixed wire hook (22) at the tip of the operating wire (20) is provided at the front of the handle.

Note that even if the transmission efficiency of the wire (20) decreases and only the brake lever (4) moves back due to a lever spring (8), which will be described later, the hooking body (43) does not stop the wire hooking (22). ) is formed into a wipe without slits so that it separates fl-1/y.

Therefore, the brake lever (4) is connected to the operating portion (
42) and apply an operating force in the direction of the arrow 5
) and the center of the wire hook (22).
The ratio (a/b) between the center of 43) and the length b) is 4.5
It is said that

This lever ratio (a/b) can be set arbitrarily, but
Usually it is set to 4.5. Therefore, it is preferable to set it to 4.5, but it may also be set to 3.0 to 5.0.

There is a space between the brake lever (4) configured as above and the bracket (3).
4) A lever spring (
8).

This lever spring (8) has one end in contact with the inner surface of the operating portion (42) of the brake lever (4), and the other end is locked in the support wall (3c) of the bracket (3). The middle part is wound into a coil shape.

Moreover, on the other hand, the side-pull type caliper brake-1-(
10) is a pair of brake arms (11) that serve as operating pieces.
(12) is pivotally connected to the pivot shaft (13), and each brake arm (11) (12) is provided with a brake shoe (12) having a braking surface facing the wheel rim (R) of the bicycle.
14) While holding (15), attach the fixing device (16) for the operating wire (20) to one of the brake arms (11) and (12), and the outer tube (21) to the other.
A receiver (17) is provided between the pivot shaft (13) and each brake arm (11) (12) to move the brake arm (11) (12) back from the operating position to the return position. A brake spring (18) is provided to cause the

In addition, (9) in Fig. 1 is the bracket cover, and (19)
) (19) is a stopper for the brake spring (18).

However, the present invention provides the lever spring (8) and the brake spring (18) as described above, and also provides the lever spring (8) (
18) is constructed as follows.

That is, the lever ratio (R
= a/b) is 4.5, the brake spring operating efficiency (λA) is 80%, and the lever spring operating efficiency (λB) is 85%, and the transmission efficiency (λW) of the operating wire (20) is
When is 35%, the pulling force (F,) of the lever (4) is 900? The return force of the lever (4) (F2
) is 1007 or more, the spring force (K, ) of the brake spring (18) is set to 1.1°O? The spring force (F2) of the lever spring (8) is set as follows, and the spring force (F2) of the lever spring (8) is
18) is set based on the setting spring force (K,).

The lever ratio (R), brake spring operating efficiency (λA), and lever spring operating efficiency (λB) are set based on standard design values, and the operating wire (2o
) transmission efficiency (λW) is usually 65 before use.
%, but since it decreases with long-term use, it has been set at 35% in consideration of the safety level.

And the pulling force (Fl) of the lever (4) is 900?
As explained earlier, the following is based on the lever pulling force when operating a caliber brake that incorporates a 4 kg brake spring, which is normally used in conventional braking devices, with the brake lever. As a result of a sensory test conducted by humans, all people felt light when it was below 9007, and 900? If it exceeds the value, it is felt that there is not much difference from the standard, and the return force (F2) of the lever (4) is 100? Is it more than 100? If the brake force is lower than that, the return of the lever (4) will be slow and the brake operation will feel uneasy.

The pulling force (FI) of the lever (4) is determined by the following formula, and the returning force (F2) of the lever (4) is determined by the following formula.

Therefore, the spring force (F2) of the lever spring (8) is
At least 200? is required, and the spring force (F2) of the lever spring (8) is set to the minimum value of 2001! When set to , the pulling force (F,) of the lever (4) is 900? To avoid exceeding
The spring force (K,) of the brake spring (18) is calculated from the above equation 0 to 1,100? The following settings are required.

Incidentally, the spring force (K,) of the brake spring (18) is 1
．． 088? To close, set the spring force (F2) of the lever spring (8) to 200? When it is closed, the lever pulling force (FI) is 899. when the transmission efficiency (λW) is 35% according to the above formula.
8? So, the lever return force (F2) is 104? becomes. In addition, the spring force (F2) of the lever spring (8) is 200
? Spring force (R) of the brake spring (18) when closed
8) is preferably set to 1.0507 as a design value in consideration of product variations.

In addition, a preferred example for implementation is the brake spring (
18) Spring force (Kl) is 800? , lever spring (8)
The spring force (F2) is set to 8007. In this case, when the transmission efficiency (λW) of the wire (20) is 65%, the lever pulling force (Fl) is 499? , lever return force (
F2) is 206? Therefore, the transmission efficiency (λW) is 35
Even if it decreases to %, the lever pulling force (Fl) is 792? , lever = return force (F2) is 163? This is an ideal braking system that allows contact to be made with a light operation, has a good feeling when the lever returns, does not give a sense of anxiety, and does not cause the lever (4) to rattle due to vibrations from the bicycle. The device is obtained.

In addition, as another example, the spring force (K
1) for 700? , the spring force (F2) of the lever spring (8) is 800? You can close it. In this case, when the transmission efficiency (λW) of the wire (20) is 65%, the lever pulling force (Fl
) is 508? , lever return force (F2) is 232? So, even if the transmission efficiency (λW) decreases to 35%, the lever pulling force (Fl) will be 765? , lever return force (F2) is 1
95? Therefore, braking can be performed with a light operation, and the return feeling of the lever (4) is also good, so there is no feeling of anxiety.
), it is possible to obtain a braking device that does not rattle.

In addition, in the present invention, the brake spring (18) has a minimum force necessary to separate the brake shoes (14) and (15) from the rim (R) when the brake lever (4) is released. It may be taken as the spring force (K, ).

In this case, the spring force (K1) of the brake spring (18)
is extremely small, so the spring force (F2) of the lever spring (8) reduces the lever pulling force (F, ) by 900
? 3,400? A relatively strong spring force can be used.

Moreover, the brake lever (4) shown in FIG. 1 is arranged so that the wire (20) is guided below the bracket (3) and installed on the brake (10) via the handle (H). However, as shown in FIG. 2, the wire (20) is inserted into the front wall of the bracket (3), and
The receiving body (6) of the outer cylinder (21) may be received.

In this case, a hook (43) for hooking the wire hook (22) of the wire (20) is pivotally attached to the base (41) of the brake lever (4).

As mentioned above, this hanging body (43) is the hanging body (43) shown in FIG.
Similar to 43), the transmission efficiency of the wire (20) decreases and the lever spring (8) causes the brake lever (4) to
However, the wire hook (22) is configured so that it does not come off even when the wire hook (22) moves backward, and the hook (43) of the embodiment shown in FIG. 43a)
It is formed into a U-shape with a free end that is connected to the lever (
4), and the connecting piece (43a) has the →
The insertion hole (43b) of the ear hook (22) and the wire (2)
0), and separately from the hanging body (43), an insertion hole (44a) of the wire hook (22), a wire insertion slit (44b), and this slit (44b). forming a retaining cap (44) having a narrowed portion (44c) smaller than the diameter of the wire (20) in the middle thereof, and fixing the retaining cap (44) to the locking body (43); The wire (20) is prevented from coming off.

In addition, the embodiment described above uses a side-pull type caliper.
Although the brake (10) was used, other center-pull type caliber brakes may be used, or hub brakes such as rim brakes, cantilever brakes, drum brakes, and band brakes, etc., have an operating piece and an operating wire (20).
Any type of brake may be used as long as braking is performed by operating the brake lever (4) via the brake lever (4).

Further, the brake lever (4) may be applied not only to a drop handle but also to a flat handle or an up handle, and the type of the lever (4) is not limited.

(Effects of the Invention) The present invention has a brake lever (4) pivotally connected to a bracket (3) and actuating pieces (11, 12), and a brake (10) operated by the brake lever (4) and the brake. A bicycle braking device comprising an operating wire (20) that transmits the operation of the lever (4) to the operating piece (11° 12) of the brake (10), A lever spring (8) that moves back to the return position, and a brake spring (18) that moves the actuating piece (11, 12) back from the operating position to the return position,
Lever ratio (a/b) in the brake lever (4)
is 4.5, the brake spring operating efficiency (λA) is 80%, and the lever spring operating efficiency (λB) is 85%, and when the transmission efficiency (λW) of the operating wire (20) is 35%, the What is the lever pulling force (F,) of lever (4)?
C9007 or less, the lever return force (F2) is
1007 or more, the brake spring (18)
Is the spring force (K1) 1,100? The spring force (K2) of the lever spring (8) is set as follows, and the spring force (K2) of the lever spring (8) is
8) Since the setting is based on the setting spring force, it is compared to the conventional braking device in which the brake is equipped with a brake spring with a large spring force and also provides the return force of the brake lever. Therefore, even if the transmission efficiency of the operating wire (20) decreases, the braking operation can be performed extremely lightly, and the return feeling of the lever (4) is also good, so that the driver does not feel uneasy. A braking device is obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view showing another embodiment of the brake lever, and FIG. 3 is an exploded perspective view of a latch portion. (3) Bracket (4) Brake lever (8) Lever spring (10) Brake (11) (12) ...Brake arm (actuating piece)

Claims (1)

[Claims] a brake lever (4) pivotally connected to the bracket (3);
The brake lever (4) has actuating pieces (11, 12).
) The operation of the brake (10) and the brake lever (4) is controlled by the operating piece (1) of the brake (10).
1, 12); a lever spring (8) for moving the brake lever (4) back from the operating position to the return position; 11, 12) from the operating position to the return position, the lever ratio (a/b) of the brake lever (4) is 4.5,
Under the conditions that the brake spring operating efficiency (λA) is 80% and the lever spring operating efficiency (λB) is 85%, when the transmission efficiency (λW) of the operating wire (20) is 35%, the lever (4) The lever pulling force (F_1) is approximately 900 grams or less, and the lever return force (F_2) is approximately 100 grams.
The spring force (K_1) of the brake spring (18) is set to 1,100 grams or less so that the spring force (K_2) of the lever spring (8) is equal to or higher than the setting spring of the brake spring (18). A bicycle braking device characterized by being set based on force.