JP2008044542A - Braking device of bicycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a braking device of a bicycle using a cable, capable of rapidly increasing/decreasing the pressure to a necessary level in order to prevent any wheel lock and ensure the braking force even when the responsiveness of the cable is slow. <P>SOLUTION: In the braking device for the bicycle, a brake shoe is pressed against a rim of a wheel by moving an inner cable arranged in side an outer cable by a brake lever provided on a handlebar, and the braking force is given to the wheel corresponding to the generated pressure. A braking force adjusting device is provided on a brake shoe part for directly pressing the rim of the wheel. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  According to the present invention, the inner cable disposed inside the outer cable is moved by a brake lever provided on the handle to press the brake shoe against the rim of the wheel, and the wheel is applied to the wheel in response to the generated pressing force. More particularly, the present invention relates to the provision of a braking force adjusting device and a cable holding device in a bicycle braking device.

  In general, a bicycle has a low running speed and is an unstable and unstable vehicle. When braking suddenly or on a slippery road surface, if the wheel is locked, the steering wheel will not work and the running will become more unstable. . Therefore, in order to prevent the wheel from locking during braking and to secure the braking force, the control device catches the warning when the warning that the wheel is locked and reduces the pressing force of the brake shoe pressed against the wheel rim. Therefore, it is necessary to reduce the braking force to avoid the wheel locking, and to quickly repeat the operation of increasing the pressing force and recovering the braking force at the same time that there is no sign of the wheel locking. However, as described below, the bicycle brake device operates the brake shoe by pressing the brake shoe against the wheel by operating the brake arm of the brake shoe close to the rim of the wheel with a cable. Although braking force is applied to the wheel, since the response of the cable is low, it is difficult to prevent wheel lock and to secure the braking force by rapidly increasing, maintaining, and rapidly decreasing the braking force by operating the cable.

  1 and 8, a bicycle brake device will be described. Generally, an inner cable 572 arranged inside an outer cable 571 is moved by a brake lever 13 provided on a handle, whereby a brake shoe 60 is moved to a wheel rim. The braking force is applied to the wheels in response to the generated pressing force. In this type of bicycle brake device, a pair of brake arms 51 are provided in the brake body, and mainly the following two types are well known depending on the type of cable connection to the brake arm 51. One is a center-pull type in which an inner cable 572 divided into two is locked at the ends of both brake arms, and is mainly used in a cantilever brake device. This center pull type has the outer cable 571 locked to the bicycle frame. The other is a side-pull type that locks the inner cable 572 and the outer cable 571 to the respective brake arms 51, and is mainly used in a caliper type brake device.

  The side-pull brake will be described. A mounting bolt 515 fixed to a bicycle frame, a pair of left and right brake arms 51 pivotally attached to the mounting bolt 515, that is, a C arm 511 and a Y arm 512, and both arms 511 and 512 are provided. And a spring body 513 for applying a return repulsive force. That is, the C arm 511 is substantially C-shaped in a plane, and a central portion is pivotally supported by the mounting bolt 515, the brake shoe 60 is attached to one end 511a, and the tip of the inner cable 572 is attached to the other end 511b. A cable fixing mechanism 56 for fixing the portion.

  The Y arm 512 is substantially Y-shaped in plan, and the base end 512a is pivotally supported by the mounting bolt 515 inside the C arm 511, and the brake shoe assembly 53 is mounted on the lower extension end 512b. A cable fixing mechanism 55 is attached to the upper extended end 512c to fix the distal end portion of the outer cable 571 through which the inner cable 572 is inserted. The spring body 513 is disposed so as to pass through a spring groove of a brake spring holding metal 516 (not shown) and to engage with a protrusion 514 on the rear side of the brake arm.

  During the braking operation, the inner cable 572 is pulled while compressing the spring body 513, and the other end 511 b of the C arm 511 rotates in a direction approaching the extended end 512 c of the Y arm 512. The brake shoe 60 attached to the C arm 511 rotates in a direction approaching the wheel rim 7.

  The extension end 512c of the Y arm 512 rotates in the direction of the other end 511b of the C arm 511 against the elasticity of the spring body 513, and at the same time, the extension end 512b of the Y arm 512 to which the brake shoe 60 is attached is the wheel. It rotates in a direction approaching the rim 7. As a result, both the left and right brake shoes 60 sequentially press the left and right side surfaces of the wheel rim 7 to brake the wheel 9.

  When the brake lever is released to release the brake, the brake shoe 60 attached to the end 511a of the C arm 511 is first separated from the rim 7 of the wheel, and then the extended end 512b of the Y arm 512 to the brake shoe 60 is moved to the wheel. The repulsive force acting on the Y arm 512 is separated from the rim 7 and is integrated with the original repulsive force of the C arm 511 to act on the C arm 511 to return to the original standby state. As described above, the conventional bicycle brake device is a brake mainly operated by a cable. However, since the response of the cable itself is low, the pressure applied to the side of the wheel rim of the brake shoe is 0.1 second or less to prevent wheel lock. It can be said that it is difficult to increase or decrease in (see FIG. 7).

As an improvement measure, a responsive hydraulic brake device is used to prevent wheel lock during braking. As the hydraulic brake device, a braking force is applied to the front wheels corresponding to the hydraulic pressure generated in the front wheel master cylinder under the action of the front wheel brake operation unit and the front wheel master cylinder connected to the front wheel brake operation unit. A front wheel braking unit, a front wheel braking force reducing unit that adjusts a hydraulic pressure generated in the front wheel master cylinder to reduce a braking force, a rear wheel master cylinder coupled to a rear wheel brake operation unit, A rear wheel braking unit that applies a braking force to the rear wheel corresponding to the hydraulic pressure generated in the rear wheel master cylinder under the action of the rear wheel brake operation unit, and the hydraulic pressure generated in the rear wheel master cylinder are adjusted. A rear wheel braking force reducing portion for reducing the braking force, and the front wheel braking force reducing portion is disposed between the front wheel braking operation portion and the front wheel, and the rear wheel braking force is reduced. The reduction part is the rear wheel brake operation part and the rear It is arranged between the. Some brake operation units and the master cylinder are connected by a cable. Hydraulic brake devices are used in motorcycles because of their good anti-wheel locking performance, but bicycles are rarely used because they are expensive, heavy and large in volume.
Japanese Utility Model Publication No. 2-10169 JP-A-5-105174

  The problem to be solved is that the brake system for bicycles using cables has low responsiveness due to the cables, so that the pressing force can be increased and decreased quickly to the extent necessary to prevent wheel locking and ensure braking force during braking. It is a point that cannot be done.

  The most important aspect of the present invention is that, in a bicycle brake device using a cable, the brake force adjusting device for adjusting the pressing force to reduce the braking force is provided in the brake shoe portion of the brake device in which the response delay of the cable does not affect. Features.

  The bicycle brake device of the present invention has an advantage that the pressing force is quickly increased or decreased to the extent necessary for preventing wheel lock and ensuring the braking force during braking.

  Bicycles are low-speed, fluctuating and unstable vehicles. When braking suddenly or braking on a slippery road surface, if the wheels are locked, the steering wheel will not work and the driving will become unstable. A lightweight bicycle brake device with a braking force adjustment device that can quickly increase and decrease the pressing force to the extent necessary to prevent wheel locks and ensure braking force has been realized at low cost.

  Below, the Example at the time of using this invention for the side pull type brake of a front wheel is described. The front wheel brake 5 shown in FIG. 2 includes a mounting bolt 515 fixed to a bicycle frame, a pair of left and right brake arms 51 pivotally attached to the mounting bolt 515, that is, a C arm 511 and a Y arm 512, and both arms 511. 512, and a spring body 513 that applies a return repulsive force to 512. That is, the C-arm 511 is substantially C-shaped in plan and has a central portion pivotally supported by the mounting bolt 515, the brake shoe assembly 52 attached to one end 511a, and the inner cable 572 to the other end 511b. A cable fixing mechanism 56 for fixing the front end of the cable.

  The Y arm 512 is substantially Y-shaped in plan, and the base end 512a is pivotally supported by the mounting bolt 515 inside the C arm 511, and the brake shoe assembly 53 is mounted on the lower extension end 512b. A cable fixing mechanism 55 is attached to the upper extended end 512c to fix the distal end portion of the outer cable 571 through which the inner cable 572 is inserted. The spring body 513 is disposed so as to pass through a spring groove of a brake spring holding metal 516 (not shown) and to engage with a protrusion 514 on the rear side of the brake arm.

  During the braking operation, the inner cable 572 is pulled while compressing the spring body 513, and the other end 511 b of the C arm 511 rotates in a direction approaching the extended end 512 c of the Y arm 512. The brake shoe assembly 52 attached to the C arm 511 rotates in a direction approaching the wheel rim 7.

  The extended end 512c of the Y arm 512 rotates in the direction of the other end 511b of the C arm 511 against the elasticity of the spring body 513, and at the same time, the extended end 512b of the Y arm 512 to which the brake shoe assembly 53 is attached. Rotates in a direction approaching the wheel rim 7. As a result, the left and right brake shoe assemblies 52 and 53 sequentially press the left and right side surfaces of the wheel rim 7 to brake the wheel 9.

  When the brake lever is released to release the brake, the brake shoe assembly 52 attached to the end 511a of the C arm 511 is first separated from the rim 7 of the wheel, and then the extended end 512b of the Y arm 512 to the brake shoe assembly. The solid body 53 is separated from the wheel rim 7 and the repulsive force acting on the Y arm 512 is integrated with the original repulsive force of the C arm 511 to act on the C arm 511 to return to the original standby state.

  Next, the brake shoe assemblies 52 and 53 equipped with the braking force adjusting device will be described. Since the left and right brake shoe assemblies 52 and 53 are symmetrical, only one brake shoe assembly 52 will be described. As shown in FIGS. 2, 3, and 4, the brake shoe assembly 52 has a slide surface 521a opposite to the surface in contact with the wheel rim 7 as a tapered surface, and the tapered surface is covered with a metal plate. A broken shoe shoe 521 and a shoe guide 525 having a U-shaped cross section extending in the longitudinal direction are attached, and the brake shoe 521 is slidably mounted with the guide bottom surface 525 a being a tapered surface. A braking force adjusting rod 524 that receives the tangential force of the wheel 9 applied to the brake shoe 521 at the time of a pressing operation is provided at one end in the direction, and a presser plate 523 formed of an elastic body at the other end to prevent the brake shoe 521 from falling off. Has a shoe support member 522 secured with screws and a lead screw 524a on the outer periphery, and a rotation-preventing groove 524b is provided in the axial direction. The tip of the bolt 529 inserted into the through hole formed in the two rod supports 522a and 522b of the support member 522 and screwed from the side surface of the rod support 522a is in sliding contact with the bottom surface of the rotation stop groove 524b. Braking force adjustment in which the male screw of the lead screw 524a is rotatably screwed into the female screw hole formed at the center position of the worm wheel 526 disposed between the rod support 522a and the rod support 522b. A rod 524 and a worm wheel 526 engaged with a worm gear 527 driven by a motor 528 are configured. Note that a rotatable steel ball 524c is embedded in the contact surface of the braking force adjusting rod 524 with the brake shoe 521 to reduce wear of the contact surface.

  As shown in FIG. 5, the operation of the braking force adjusting device receives a tangential force of the wheel 9 applied to the brake shoe 521 during the pressing operation by the braking force adjusting rod 524. When it is necessary to reduce the pressure, the motor 528 is driven to rotate the worm wheel 526 via the worm gear 527 to move the braking force adjusting rod 524 by x mm in the forward direction of the wheel 9 so that the brake shoe 521 is moved to the wheel. 9 slidably move the surface 525a of the taper angle θ formed in the direction shown in FIG. 5 in the shoe guide 525 by x mm to generate a gap δ = x · Tanθ between the wheel rims 7. The pressing force of the brake shoe 521 to the wheel rim 7 is reduced, and the braking force can be reduced.

  The brake lever 13 provided on the handle 3 pulls the inner cable 572 disposed inside the outer cable 571 to press the brake shoe assemblies 52 and 53 against the wheel rim 7 to generate a braking force. When the braking force is reduced by the braking force adjusting device of the brake shoe assemblies 52 and 53, if the inner cable 572 is further pulled by the brake lever 13, the pressing force of the brake shoe 521 increases, and the braking force is reduced. Therefore, the cable holding device 54 that holds the inner cable 572 so as not to move at the same time when the braking force adjusting device is operated is necessary.

  The configuration of the cable holding device 54 will be described. As shown in FIG. 6, a chuck body 541 is set at the lower end of the adjustment screw tube 547 of the cable fixing mechanism 55 that fixes the tip of the outer cable 571 of the Y arm 512. The tightening lever 543 is formed of an elastic body, and includes a chuck ring 542 that is externally fitted to the chuck body 541 to expand and close, and one end of which is fixed to a shaft 512d slightly below 512d of the extended end 512c above the Y arm 512. The other end is in contact with the rod 544 of the push solenoid 545.

  The operation of the cable holding device 54 is such that the rod 544 of the solenoid 545 protrudes and pushes down one end of the clamping lever 543 that is in contact with the rod, thereby deforming the clamping lever 543 into a bow downward and moving the chuck ring 542 downward. Then, by closing the chuck body 541, the inner cable 572 is held by the chuck body 541 so that the inner cable 572 does not move. When the inner cable 572 is released, the rod 544 of the solenoid 545 is retracted, and the tightening lever 543 and the chuck ring 542 deformed like a bow return to their original positions, and the chuck body 541 expands to hold the inner cable 572. Canceled.

  FIG. 1 illustrates an example of a battery-assisted bicycle having a brake equipped with the braking force adjusting device and the cable holding device. In the battery-assisted bicycle equipped with the braking devices 5 and 6 having the braking force adjusting device and the cable holding device, and the rotational speed detecting devices 11 and 12 of the front wheels 9 and the rear wheels 10, the motor control device for the battery-assisted bicycle The control device for the brakes 5 and 6 added in 1 calculates the time when there is no sign that the wheels 9 and 10 are locked or the sign that the lock is lost, and instructs the braking force adjusting device for the brakes 5 and 6 and the cable holding device. Therefore, the braking force is controlled to increase or decrease to prevent the wheels from being locked and to ensure the braking force. At this time, the driving power source of the braking force adjusting device and the cable holding device uses the battery 2 of the battery-assisted bicycle. The braking force adjusting device and the cable holding device may be attached to both the front wheel 9 and the rear wheel 10 brake devices, or one of the brake devices.

  In a general bicycle that does not have a power source, the generator for the illumination light (hub dynamo, etc.), the brake devices 5 and 6 having the braking force adjusting device and the cable holding device, and the rotational speed detection of the front and rear wheels. The devices 11 and 12 and a control device for controlling the braking force adjusting device and the cable holding device are attached, and the power supply of the generator is used to prevent the wheel from being locked and to secure the braking force. A backup battery may be provided in case the generator fails. Furthermore, in the case of a bicycle not equipped with the generator, a battery may be equipped as a control power source for preventing wheel lock and ensuring braking force.

  The brake device with this structure adjusts the braking force directly at the braking force generator (brake body), so it can increase, hold and decrease the braking force with high response, so it can be used in motorcycles and automobile braking devices. Therefore, it is possible to provide a small and light brake system at a low cost.

1 is an overall view of a battery-assisted bicycle showing an embodiment of the present invention. (Example) It is a front view of the caliper brake for bicycles showing one example of the present invention. (Example) 1 is an exploded view of a brake shoe assembly showing an embodiment of the present invention. (Example) 1 is an assembly diagram of a brake shoe assembly showing an embodiment of the present invention. (Example) It is operation | movement explanatory drawing of the brake shoe assembly which shows one Example of this invention. (Example) It is a cable holding device figure showing one example of the present invention. (Example) It is a wheel lock prevention control waveform diagram showing one embodiment of the present invention. (Example) It is a front view of the side pull type brake device of a front wheel. (Example)

Explanation of symbols

5 Front wheel brake 7 Front wheel rim 9 Front wheel 51 Brake arm 52, 53 Brake shoe assembly 54 Cable holding device 57 Cable

Claims (4)

  By moving the inner cable arranged inside the outer cable by the brake lever provided on the handle, the brake shoe assembly is pressed against the rim of the wheel, and the braking force is applied to the wheel according to the generated pressing force. The bicycle brake device is provided with a brake force adjusting device provided in the brake shoe assembly.   The brake shoe assembly includes a shoe support member, a shoe guide extending in a longitudinal direction of the shoe support member, a brake shoe slidably mounted along the guide, and the brake shoe during the pressing operation. A braking force adjusting rod that receives the tangential force of the wheel and a drive device that moves the braking force adjusting rod in the tangential force direction, and a taper portion is formed on the shoe guide and the brake shoe. The bicycle brake device according to claim 1.   By moving the inner cable located inside the outer cable with the brake lever provided on the handle, the brake shoe is pressed against the rim of the wheel, and braking force is applied to the wheel in response to the generated pressing force. A bicycle brake device, wherein a cable holding device is provided at the inner cable outlet of the outer cable.   The cable holding device has a chuck ring formed on a lower end portion of an adjustment screw of a cable fixing mechanism for fixing a distal end portion of the outer cable, and is externally fitted to the chuck body to be expanded and closed. The bicycle brake device according to claim 3, wherein the tightening lever provided and one end of the tightening lever are pivotally supported by the Y arm and the other end is in contact with a rod of a push solenoid.

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