CN112498558B - High-speed disc brake system of bicycle based on harmonic drive - Google Patents

Abstract

The invention discloses a harmonic transmission-based high-speed disc brake system for a bicycle, which comprises wheels, a driving shaft and a brake disc, wherein the brake disc is fixed on the driving shaft, and the driving shaft is connected with a centrifugal device. When the wheel rotates at a high speed, the driving shaft is driven to rotate together, and the centrifugal block moves outwards to be matched with the groove in the cam shaft; when a brake cable is tightened, the disc rotates to drive the screw rod to rotate, the nut block pushes the harmonic reducer to move forward, so that a brake pad at the bottom of the flexible wheel is in contact with the brake disc, the brake disc is not only stressed by the pressure of the brake pad, but also has a torque opposite to the rotating direction, at the moment, braking can be better realized, and along with the reduction of the vehicle speed, the torque is reduced, and the brake cannot be in a locking state; when the brake cable is released, the disc rotates under the action of the torsion spring and returns to the initial position. The invention adopts the harmonic reducer brake device, when the wheel rotates at high speed, the brake pad and the brake disc are contacted in a larger area, and the braking effect can be better realized.

Description

High-speed disc brake system of bicycle based on harmonic drive

Technical Field

The invention belongs to the field of bicycle devices, and particularly relates to a high-speed bicycle disc brake system based on harmonic transmission.

Background

Traditional mechanical type dish system of stopping realizes the brake through control hand brake dynamics, and the time has been of a specified duration can influence the sensitivity of hand brake cable, influences the braking effect simultaneously, when the wheel is advanced at a high speed, appears danger easily. The invention can better realize the braking effect according to the vehicle speed condition.

Disclosure of Invention

The invention aims to solve the technical problem of providing a high-speed bicycle disc brake system based on harmonic transmission, which adopts the following technical scheme:

a high-speed disc brake system of bicycle based on harmonic drive includes: the wheel, drive shaft and brake disc, the brake disc is fixed in the drive shaft, the drive shaft is connected centrifugal device, centrifugal device can stretch into the camshaft in the harmonic reduction gear, the rigid wheel and the nut piece fixed connection of harmonic reduction gear, camshaft can be dead axle rotation on the nut piece, nut piece and screw connection rotate along with the lead screw, and linear motion is to the nut piece, the lead screw is external to have the disc, disc and torsional spring and brake line are connected.

The centrifugal device comprises a centrifugal disc and a centrifugal block, the centrifugal disc is fixedly connected with a driving shaft, and the centrifugal block comprises a ball and a centrifugal return spring.

The harmonic reducer comprises a cam shaft, a flexible bearing, a rigid wheel and a flexible wheel. The cam shaft is internally provided with 12 grooves with the same size, the grooves can be matched with centrifugal blocks, but the axial size is slightly larger, so that the harmonic reducer can move for a certain distance along the axial direction, and the bottom of the flexible wheel is provided with a block brake pad.

A high-speed disk brake system for bicycle based on harmonic drive is composed of a drive axle driven by the wheel to rotate at high speed, a centrifugal block under the action of centrifugal force for overcoming the tension of spring and moving outwards to match with the slot in cam axle, a cam axle driven by said cam axle to rotate at high speed, a rigid wheel in fixed state, a flexible wheel rotating in reverse direction, a brake cable pulled by said flexible wheel, a screw rod driven by said disk to rotate, a nut block for pushing said harmonic speed reducer to move forward, a brake disk under the action of said brake block and a torque opposite to the rotation direction, and a brake unit consisting of brake disk and brake disc, so that the screw rod rotates, the nut block pulls the harmonic reducer back to the initial position, and thebrake pads 19 are separated from contact with the brake disc. When the wheel rotates at a low speed, the centrifugal force is smaller than the pulling force of the spring and is not enough to pull out the centrifugal block, at the moment, the harmonic reducer does not work, and the large torque is not needed during braking because the speed of the vehicle is small.

The invention discloses a bicycle high-speed disc brake system based on harmonic transmission, which has the following advantages: by adopting the harmonic reducer braking device, when the wheel rotates at a high speed, the brake pad and the brake disc are in large-area contact, and the braking effect can be better realized.

Drawings

Fig. 1 is a general system configuration diagram.

FIG. 2 is a diagram of a centrifuge.

FIG. 3 is a centrifuge block configuration.

Fig. 4 is a harmonic reducer.

In the figure: the brake comprises awheel 1, adriving shaft 2, abrake disc 3, acentrifugal device 4, aharmonic reducer 5, anut block 6, a lead screw 7, a disc 8, atorsion spring 9, abrake cable 10, acentrifugal disc 11, acentrifugal block 12, aball 13, areturn spring 14, acamshaft 15, arigid wheel 17, aflexible wheel 18 and abrake pad 19.

Detailed Description

As shown in fig. 1, a harmonic drive based high speed disc brake system for a bicycle comprises:wheel 1,drive shaft 2 andbrake disc 3,brake disc 3 is fixed in the drive shaft,centrifugal device 4 is connected to driveshaft 2,centrifugal device 4 can stretch into in thecamshaft 15 in theharmonic reduction gear 5, therigid wheel 17 and thenut piece 6 fixed connection ofharmonic reduction gear 5,camshaft 15 can be the dead axle rotation onnut piece 6,nut piece 6 and lead screw 7 are connected, rotate along with lead screw 7, and linear motion is done tonut piece 6, lead screw 7 is external to have disc 8, disc 8 is connected withtorsional spring 9 andbrake line 10.

As shown in fig. 2, the centrifugal device includes acentrifugal disk 11 and acentrifugal block 12, thecentrifugal disk 11 is fixedly connected with a driving shaft, and as shown in fig. 3, thecentrifugal block 12 includes aball 13 and acentrifugal return spring 14.

As shown in fig. 3, theharmonic reducer 5 includes acamshaft 15, aflexible bearing 16, arigid gear 17, and aflexible gear 18. Thecamshaft 15 is connected with arigid wheel 17 through aflexible bearing 16, and therigid wheel 17 and aflexible wheel 18 are coaxially arranged; thecamshaft 15 is provided with 12 grooves with equal size, the grooves can be matched with theeccentric blocks 12, but the axial size is slightly larger, so that theharmonic reducer 5 can move for a certain distance along the axial direction, and the bottom of theflexible wheel 18 is provided with 6brake blocks 19.

A high-speed disc brake system of bicycle based on harmonic drive can be realized, when thewheel 1 is in high-speed rotation, drive thedrive shaft 2 to rotate together, thecentrifugal block 12 will overcome the pulling force of thespring 14 under the centrifugal force, move outwards, cooperate with the groove in thecamshaft 15, thecamshaft 15 is driven to rotate at high speed at this moment, because therigid wheel 17 is in the fixed state, therefore theflexbile gear 18 rotates along the reverse direction, when thebrake cable 10 is strained, the disc 8 rotates, drive the lead screw 7 to rotate, thenut block 6 pushes theharmonic reducer 5 to move forward, make thebrake block 19 at the bottom of theflexbile gear 18 contact with thebrake disc 3, thebrake disc 3 not only receives the pressure of thebrake block 19 but also has a torque opposite to the rotation direction, at this moment, can better realize braking, and with the speed of a vehicle descending, the torque is reduced, the brake can not be in the locking state, when thebrake cable 10 is loosened, the disc 8 is rotated back to the initial position by thetorsion spring 9, causing the screw 7 to rotate, thenut block 6 in turn pulling theharmonic reducer 5 back to the initial position, thebrake pads 19 being out of contact with thebrake disc 3. When thewheel 1 is rotating at low speed, the centrifugal force is less than the tension of thespring 14, and is not enough to pull out thecentrifugal block 12, and theharmonic reducer 5 does not work, so that the brake does not need to use large torque due to low speed.

The invention discloses a bicycle high-speed disc brake system based on harmonic transmission, which has the following advantages: by adopting the harmonic reducer braking device, when the wheel rotates at a high speed, the brake pad and the brake disc are in large-area contact, and the braking effect can be better realized.

Claims (1)

1. The utility model provides a high-speed dish of bicycle device of stopping based on harmonic drive which characterized in that: comprises wheels, a driving shaft and a brake disc; the brake disc is fixed on a driving shaft, the driving shaft is connected with a centrifugal device, the centrifugal device extends into a cam shaft in a harmonic reducer, a rigid wheel of the harmonic reducer is fixedly connected with a nut block, and the cam shaft rotates on the nut block in a fixed shaft mode; the nut block is connected with the screw rod, and the nut block moves linearly along with the rotation of the screw rod; the lead screw is externally connected with a disc; the disc is connected with the torsion spring and the brake cable;

the centrifugal device comprises a centrifugal disc and a centrifugal block, the centrifugal disc is fixedly connected with a driving shaft, and the centrifugal block comprises a ball and a centrifugal return spring;

the harmonic reducer comprises a cam shaft, a flexible bearing, a rigid wheel and a flexible wheel;

the camshaft is connected with the rigid wheel through a flexible bearing, and the rigid wheel and the flexible wheel are coaxially arranged; 12 grooves with the same size are formed in the camshaft and can be matched with the centrifugal block; and a brake block is arranged at the bottom of the flexible wheel.

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