JPH08244667A - Brake bar for bicycle - Google Patents

Abstract

PURPOSE: To set the operation feeling of a lever to an ideal pattern by providing the brake lever rotatably fitted to a base for pulling the end section of an inner cable extracted from an outer cable in a bicycle. CONSTITUTION: The other end of a link body 31 connected and fixed with an inner cable 41 at one end is rotatably connecte to a lever 3 by a spindle 32, projections 52 protruded in the same direction as the spindle 32 are provided near the end section of the inner cable 41 side of the link body 31, a cam track kept in contact with the projections 52 along the moving region of the link body 31 when the lever 3 is operated is formed on a base 2, and the operation feeling at the time of a braking action is set by the shape of the cam track.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-wheeled vehicle brake lever applied to bicycles, motorcycles, and the like.

[0002]

2. Description of the Related Art A two-wheeled vehicle brake lever having a structure as shown in FIG. 4 is known. Handlebar
The cable insertion hole (22) is formed in the base (2) fixed to the (6) with the tightening band (24).
2) The outer cable (40) is inserted and fixed near one end. Further, an engaging rod (42) is fixed to the end of the inner cable (41) pulled out from the outer cable (40), and the engaging rod (42) is inserted into the lever (3). It is engaged with the through hole (45) provided, and further, the lever (3)
Is rotatably supported by the support shaft (23) on the base (2).

In this structure, when the lever (3) is gripped, the inner cable (41) is pulled out from the outer cable (40) and the brake rubber (not shown) is pressed against the rim, whereby a braking effect is obtained. However, the above-mentioned conventional structure has a problem that it is difficult to set the operation feeling of the lever (3) in an ideal mode that is empirically known.

This is because the force acting on the lever (3) from the inner cable (41) at the time of braking operation (the above-mentioned conventional one is the connecting portion of the inner cable (41)) on the movement locus of the force. This is because it is not possible to set the tangential direction component (hereinafter referred to as the necessary operating force of the lever (3)) of (1) to a mode that slightly changes with the braking operation.
That is, in the above-mentioned conventional one, the inner cable (41) is simply pulled by the rotating lever (3). Therefore, the movement locus of the end portion of the inner cable (41) is inevitably set in the shape of a simple arc centering around the pivotal fulcrum of the lever (3), and the required operating force changes with braking operation. It will be decided uniformly. However, in order to obtain the ideal operating feeling desired for braking operation, it is necessary to change the required operating force of the lever (3), which changes through a series of braking operations, in a complicated manner that is empirically known. Therefore, the conventional operation cannot secure the ideal operation feeling.

The present invention has been made in view of the above-mentioned points, namely, "the base (2) for fixing the end portion of the outer cable (40)."
And an inner cable (41) rotatably attached to the base (2) and pulled out from the outer cable (40)
It is an object of the present invention to provide a two-wheeled vehicle brake lever having a lever (3) for pulling the end portion of the lever (3) so that the operation feeling of the lever (3) can be set in an ideal manner.

[0006]

[Technical Means] The technical means of the present invention for solving the above-mentioned problem is that "the other end of a link body (31) having an inner cable (41) connected and fixed to one end is connected to a lever (3) by a support shaft (32). ) Is rotatably connected to the inner cable of the link body (31).
A protrusion (52) protruding in the same direction as the support shaft (32) is provided near the end on the (41) side, while the base (2) has the above-mentioned link body accompanying the operation of the lever (3). A cam track facing the moving area of (31) and contacting the protrusion (52) is formed, and the operation feeling at the time of braking operation is set according to the shape of the cam track. ”

[0007]

The above technical means operates as follows. The tension of the inner cable (41) is received by the lever (3) at the support shaft (32) of the link body (31). That is, the point of action of the force acting from the inner cable (41) to the lever (3) is at the support shaft (32) portion connecting the link body (31) and the lever (3).

When the lever (3) is rotated, the connecting portion (support shaft (32) portion) of the link body (31) moves in a circular motion around the rotation fulcrum of the lever (3). . or,
Link body (31) connected to lever (3) via support shaft (32)
Moves in the direction of rotation of the lever (3). Then, the protrusion (52) provided on the link body (31) moves along the cam track of the base (2) corresponding thereto while being in contact therewith.

Therefore, the required operating force of the lever (3) is as follows. That is, from the pivot of the lever (3) to the link body (3
A line connecting the tangent line of the shaft support part on a circle whose radius is the straight line drawn to the shaft support part (support shaft (32) part) of 1) and the projection (52) and the shaft support part of the link body (31). The required operating force of the lever (3) changes according to the angle formed by the minute. That is, when the inner cable (41) and the link body (31) are arranged in a straight line and the angle is “0”, the required operating force of the lever (3) becomes equal to the tension of the inner cable (41). The ratio between the required operating force and the tension changes as the angle changes.

Therefore, according to the above technical means, the required operating force of the lever (3) due to the tension of the inner cable (41) is the shape of the cam track, that is, the protrusion () which moves through a series of braking operations. 52) It changes according to the mode of the movement trajectory.

[0011]

[Effect] The present invention has the following unique effects. The required operating force of the lever (3) due to the tension of the inner cable (41) is the protrusion (52) that moves through a series of braking operations.
Since the shape of the cam track that defines the above-mentioned movement locus can be set in an ideal manner, the operation feeling received by the driver through a series of braking operations can be set.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention described above will be explained with reference to the drawings. As shown in FIGS. 1 to 3, the base (2) is formed with a bar insertion hole (H) for externally fitting the handle bar (6), and the handle inserted into the bar insertion hole (H). The bar (6)
The base (2) is connected to the base (2) by tightening a bolt (B) with a slit (S) that is formed at the bottom of the base (2) and tightens the bar insertion hole (H).

The base (2) is composed of left and right side plates (26) and (27), and a front plate (29) and an upper plate (28) which are erected in a range from the front surface to the upper surface of these both side plates. As a result, an internal space (20) that opens rearward is formed in the base (2). The front end of the brake cable (4) is fitted and fixed in the cable insertion hole (22) formed in the front plate (29), and the inner cable (41) of the brake cable (4) is It is connected to the link body (31) via an engagement rod (42) provided at the tip thereof. That is, the link body
The pair of left and right arms (313) (314) protruding at the tip of (31) are provided with lateral holes (311) (312) for inserting the engaging rod (42) at the tip of the inner cable (41). The one arm (314) is provided with a cable insertion slit (315) for connecting the inside and outside of the lateral hole (312) formed therein. Therefore, the engagement rod (42) is inserted from one lateral hole (312) into the other lateral hole (311) in such a manner that the inner cable (41) is inserted into the cable insertion slit (315), and then the inner cable (41) is inserted. When (41) is in horizontal position, this is the link body.
Can be connected to (31). Also, female screws (317) (318) are provided on the outer circumferences of the lateral holes (311) (312) formed in the arms (313) (314).
Is engraved, and the female screw part (317) (318) has a cylindrical shaft (511) (52) with which the screw shaft (511) is provided.
(521) is screwed in.

The left and right side plates (26) (27) of the base (2)
A cam fitting hole (261) (271) (corresponding to the holding means of claim 2) is cut into the cam fitting hole, and the cam fitting hole (261) (271).
The cam plates (61) and (62) provided with the cam holes (611) and (621) are attached to these. That is, the cam plates (61) (62) are inserted into the internal space (20) of the base (2) from the rear end open part, and the left and right side plates (26) (27) of the base (2) are drilled. Through the cam fitting holes (261) (271)
13) is inserted. Then, as shown in FIG.
Flange (612) protruding to the outer circumference of the base end of the cam plates (61) (62)
(622) engages with the peripheral edge of the cam fitting holes (261) (271), whereby the cam plates (61) (62) are fitted into the cam fitting holes (26
1) It is inserted and fixed in (271). Also, the cam holes (611) (62
The shape of 1), until the brake rubber comes into contact with the rim at the time of braking operation described later (the area of play),
After the inner cable (41) is linearly pulled along the central axis near the end of the outer cable (40) and the brake rubber comes into contact with the rim, the end of the inner cable (41) is struck by the support shaft (2).
The shape is set so that it is pulled in the direction approaching 3). As a result, an ideal operation feeling in consideration of the play area and the effective braking area thereafter can be obtained.

A shaft hole (327) is formed in the vicinity of the rear end of the link body (31), and the shaft hole (327) portion forms both side plates (36) constituting the lever (3). Long hole (3)
The screw shaft (328) and the nut (329) are connected to the parts (61) and (371). Next, set the left and right side plates (2
6) In the space (20) between (27), open the lever from the rear opening.
The tip of (3) is inserted. Also, the through holes (360) (370) formed near the lower ends of both side plates (36) (37) constituting the lever (3) are provided when the lever (3) and the base (2) are joined. The left and right side plates (26) and (27) are formed so as to correspond to the through holes (260) and (270). or,
The thickness of the lever (3) is equal to the left and right side plates (26) (2
7) It is set to be slightly smaller than the space dimension so that it can be loaded between them. And base lever (3)
Insert it between the left and right side plates (26) and (27) of (2), and align the through holes (360) (370) on the lever (3) side with the through holes (260) (270) on the base (2) side. The lever (3) is rotatably attached to the base (2) by fixing the portion with a bolt-shaped support shaft (23) and a nut (not shown).

Next, the actual use of the brake lever of the above embodiment will be described. In this case, when the lever (3) is rotated from the state shown in FIG. 1, the screw shaft (328) which is the rotation fulcrum of the link body (31) becomes the support shaft (23) which is the rotation fulcrum of the lever (3).
A circular motion centering around the link body (31) causes the link body (31) to move in the rotation direction of the lever (3). Then the link body
The protrusions (52) (51) protruding to both sides of the tip of (31) are the cam plates (61).
Cam holes (611) at (62) (621) Move along the peripheral cam slope.

The required operating force of the lever (3) is as follows. As shown in Fig. 1, the screw shaft (3
28) The tangent line of the movement axis (A) of the screw shaft (328)
Straight line (S) drawn from (B) and protrusion (52) to the above screw shaft (328)
When the angle θ formed by is 0, that is, when the inner cable (41) and the link body (31) are aligned linearly and the angle is 0, the lever (3) The required operating force is equal to the tension of the inner cable (41). And
As the angle changes, the ratio between the required operating force and the tension changes. Therefore, by devising the shape of the cam holes (611) (621) formed in the cam plates (61) (62), it is ideal for a series of braking operations that increase the amount of rotation of the lever (3). The braking operation can be performed with an operating force that changes.

The locus of movement of the protrusion (52) is in the direction in which the inner cable (41) is linearly pulled out from the outer cable (40) in the initial stage when the brake rubber (not shown) is not in contact with the rim, In the effective braking area after the rubber comes into contact with the rim, the direction approaches the support shaft (23).
Particularly in the above embodiment, the left and right side plates (26) (27) of the base (2)
Since the configuration is such that the cam plates (61) (62) are detachably attached to the through holes (260) (270) drilled in the, multiple types with different shape cam holes (611) (621) Cam plate (61) (62)
Can be prepared in advance and selectively attached to the through holes (260) (270). As a result, a feeling of the braking operation that suits the driver's taste can be secured.

[Brief description of drawings]

FIG. 1 is a side view of a partial cutaway according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of an embodiment of the present invention.

FIG. 3 is a cross-sectional view of the accommodating portion of the link body (31).

FIG. 4 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 (2) ・ ・ ・ Base (3) ・ ・ ・ Lever (31) ・ ・ ・ Link body (32) ・ ・ ・ Spindle (40) ・ ・ ・ Outer cable (41) ・ ・ ・ Inner cable (52) ・..Protrusions (61) ... Cam plate (62) ... Cam plate

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[Procedure amendment]

[Submission date] August 23, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

The base (2) includes left and right side plates (26) (2
7) and a front plate (29) and an upper plate (28) which are erected in a range from the front surface to the upper surface of these both side plates, whereby the base (2) is rearwardly arranged. An open internal space (20) is formed. The front end of the brake cable (4) is fitted and fixed in the cable insertion hole (22) formed in the front plate (29),
Furthermore, the inner cable (4) of the brake cable (4) is
1) is connected to the link body (31) via an engaging rod (42) provided at the tip thereof. That is, the pair of left and right arms (313) protruding from the tip of the link body (31)
The lateral holes (311) (31) for inserting the engaging rods (42) at the tip of the inner cable (41) are provided in (314).
2) is bored, and a cable insertion slit (315) for connecting the inside and the outside of the lateral hole (312) bored in the one arm (314) is opened and cut. Therefore, the engagement rod (42) is inserted from one lateral hole (312) into the other lateral hole (311) in such a manner that the inner cable (41) is inserted into the cable insertion slit (315).
After that, when the inner cable (41) is placed in a horizontal posture, it can be connected to the link body (31). Further, the lateral holes (311) (3) formed in the arms (313) (314).
Internal threads (317) (318) are engraved on the outer circumference of the outer peripheral surface (12). The internal threads (317) (318) are provided with cylindrical screw shafts (51) (52). (51
1) (521) is screwed.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

The left and right side plates (2) of the base (2) are also
6) Cam fitting holes (261) (271) (corresponding to the holding means of claim 2) are cut into the (27), and the cam fitting holes (261) (271) have the cam holes (611).
The cam plates (61) and (62) including (621) are mounted. That is, the cam plates (61) (62)
Is inserted into the internal space (20) of the base (2) from its rear end open portion, and the left and right side plates (2) of the base (2) are
6) Cam fitting holes (261) (27) formed in (27)
The main body portion (613) of the cam plates (61) (62) is fitted into 1). Then, as shown in FIG. 3, the flanges (6) projecting to the outer periphery of the base end portions of the cam plates (61) (62).
12) (622) is the cam fitting hole (261) (27)
1) Engage with the peripheral edge of the cam plate (61)
(62) is fitted and fixed in the cam fitting holes (261) (271). Further, the shape of the cam holes (611) (621) is such that the center of the outer cable (40) is close to the end of the outer cable (40) until the brake rubber comes into contact with the rim during the braking operation described later (the area of play). The inner cable (41) is drawn linearly along the axis, and after the brake rubber comes into contact with the rim, the end of the inner cable (41) is drawn in a direction approaching the support shaft (23). It is set. As a result, an ideal operation feeling in consideration of the play area and the effective braking area thereafter can be obtained.

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

FIG.

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Claims (2)

[Claims] 1. A base (2) for fixing an end portion of an outer cable (40), and an inner cable (41) rotatably attached to the base (2) and pulled out from the outer cable (40). A brake lever for a motorcycle equipped with a lever (3) for pulling the end portion of the inner cable (41)
The other end of the link body (31), which is connected and fixed to one end, is rotatably connected to the lever (3) by the support shaft (32), and the end on the inner cable (41) side of the link body (31). The support shaft (3
2) Provide a protrusion (52) that projects in the same direction as the
In (2), a cam track is formed which faces the moving area of the link body (31) accompanying the operation of the lever (3) and contacts the protrusion (52), and braking is performed according to the shape of the cam track. Brake levers for motorcycles that are designed to set the feeling of operation. 2. A brake lever for a two-wheeled vehicle according to claim 1, wherein the base (2) is provided with a holding means for detachably holding the cam plate, and a cam track is formed on the cam plate.