CN218537006U - Clamping groove type rear brake for electric bicycle - Google Patents

Abstract

The utility model discloses a draw-in groove formula rear brake for electric bicycle, including casing and brake shoe, above-mentioned casing is used for fixing on electric bicycle's chain stay, sets up the draw-in groove on the above-mentioned casing, and above-mentioned draw-in groove corresponds with the arch on electric bicycle's chain stay, sets up the camshaft on the above-mentioned casing, and above-mentioned camshaft both ends set up braking rocking arm and drive wheel respectively, and the above-mentioned casing inboard is equipped with adjusting gear, and above-mentioned adjusting gear and drive wheel intermeshing, above-mentioned braking rocking arm is used for driving drive wheel and adjusting gear rotation; the adjusting gear is connected with a push block; above-mentioned brake shoe includes location axle and two brake pads, and above-mentioned brake pad one end movable mounting is epaxial in the location, and the above-mentioned brake pad other end pushes away the ejector pad, and above-mentioned ejector pad is used for rotating and promotes the brake pad and opens to there is higher deviation with the straightness that hangs down of motor cooperation in the installation in hope to improve current stopper, the more obvious problem of braking loss in the use simultaneously.

Description

Clamping groove type rear brake for electric bicycle

Technical Field

The utility model relates to a stopper mounting structure, concretely relates to a draw-in groove formula rear brake for electric bicycle.

Background

The brake is commonly found in two-wheeled electric bicycle, is the main arresting gear in the bicycle use, and in the braking system of electric bicycle at present, mainly through frictional force hinder vehicle motion or motion trend, in the actual design process, present brake housing reaches main brake shell through with electric bicycle back chain fork direct connection or indirect pull rod formula is connected and is fixed, and its braking in-process mainly carries out work through current cable, for example through the cable removal of brake handle drive cable for the zip drives the friction disc friction of brake, thereby reaches the effect of braking speed reduction.

In the current production process, the brake and the bottom fork are connected and the fixing structure is directly fixed or the pull rod is connected and fixed, the bearing strength of the metal frame connecting structure is related to the welding stability, the overload behavior of the existing electric bicycle in the actual use process is relatively common, the stability of a welding part can not meet the overload behavior, and the brake and the motor are matched with each other to form higher deviation in the perpendicularity in the long-term use process. Experiments show that the verticality of the brake can cause abrasion of a brake friction material and shorten the service life to a certain extent. Therefore, how to improve the fit verticality of the brake is worth researching.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a draw-in groove formula rear brake for electric bicycle to expect to improve current stopper and the motor cooperation straightness that hangs down in the installation and have higher deviation, the more obvious problem of braking loss in the use simultaneously.

In order to solve the technical problem, the utility model adopts the following technical scheme:

a clamping groove type rear brake for an electric bicycle comprises a shell and brake shoes, wherein the shell is used for being fixed on a flat fork of the electric bicycle, a clamping groove is formed in the shell, the clamping groove corresponds to a protrusion on the flat fork of the electric bicycle, a cam shaft is arranged on the shell, a brake rocker arm and a driving wheel are respectively arranged at two ends of the cam shaft, an adjusting gear is arranged on the inner side of the shell, the adjusting gear is meshed with the driving wheel, and the brake rocker arm is used for driving the driving wheel and the adjusting gear to rotate; the adjusting gear is connected with a push block; the brake shoe comprises a positioning shaft and two brake blocks, one end of each brake block is movably arranged on the positioning shaft, the other end of each brake block abuts against a push block, and the push blocks are used for rotating and pushing the brake blocks to open.

Preferably, the shell is provided with a reinforcing rib, one side of the reinforcing rib is welded on the shell, and the other side of the reinforcing rib is fixed at the front end of the clamping groove.

Preferably, the clamping groove and the protrusion are provided with screw holes, and the screw holes are internally provided with limiting bolts.

Preferably, a transmission block is arranged on the brake block, a through hole is arranged on the transmission block, a return spring is arranged on the brake block, and two ends of the return spring are respectively locked on the through hole of the transmission block.

The further technical scheme is that the transmission block is arc-shaped and inclines towards the central axis of the brake block.

Preferably, a rocker shaft spring is provided at one side of the brake rocker arm, and the rocker shaft spring is used for resetting the brake rocker arm.

Preferably, the adjusting gear comprises two driven gears and a functional gear, the driven gears are respectively in power connection with the driving wheel and the functional gear, the pushing block is in a strip shape and is arranged on the functional gear, the rotation angle of the functional gear is smaller than 90 degrees, and the functional gear is used for driving the pushing block to rotate synchronously.

The technical scheme is that the transmission gear comprises a plurality of driven gears, two adjacent driven gears are meshed with each other, and the driven gears are used for adjusting the transmission ratio of the functional teeth and the driving wheel.

Compared with the prior art, the beneficial effects of the utility model are that at least:

the utility model discloses a design of draw-in groove formula to arresting gear connects through the chain stay that sets up draw-in groove and electric bicycle, avoids the braking main part deviation that current mechanical welding leads to the condition that is yielding greatly, is favorable to improving the installation accuracy of casing on electric bicycle's chain stay.

The utility model discloses a strengthening rib is intensity of lifting in vertical to guarantee braking impact strength's bearing strength, the security when being favorable to guaranteeing the automobile body braking under overload environment. Utility model drives the adjusting gear through the braking rocking arm to utilize ejector pad cooperation brake pads work, thereby effectively improve the friction of friction shoe and braking cavity.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic diagram of the distribution of the adjusting gear of the present invention.

Fig. 3 is a schematic view of the brake pad installation of the present invention.

Fig. 4 is a schematic view of the shell structure of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 3, an embodiment of the present invention is a clamping groove type rear brake for an electric bicycle, including a housing 1 and brake shoes, wherein the housing 1 is used for being fixed on a bottom fork a of the electric bicycle, and since a main body portion of the brake is surrounded by the housing 1, the design of the housing 1 can make the brake in a semi-closed structure, thereby ensuring the safety of internal devices.

Wherein, the brake shoe is in the same place with the installation of braking drive mechanism to the brake shoe receives drive mechanism drive, under emergency braking or in the condition of jolting the road surface and carrying out the braking, because external impact force is great, casing 1 atress is extremely uneven, in the in-process of braking suddenly, the load that casing 1 bore is instantaneous great, because the stopper often appears the deviation with the motor cooperation straightness that hangs down in the course of working simultaneously, when probably leading to brake shoe and brake drum contact to compress tightly, the brake shoe is by brake drum backward pressure stress inhomogeneous, thereby local frictional force reinforcing, in long-term use, can influence brake shoe wearing and tearing degree and life.

Referring to fig. 1 again, above-mentioned casing 1 is last to set up draw-in groove 2, and above-mentioned draw-in groove 2 corresponds with the arch on electric bicycle's chain stay A, laminates draw-in groove 2 and electric bicycle's chain stay A arch each other to make casing 1 and electric bicycle's chain stay A obtain bigger contact surface, wherein, and casing 1 passes through draw-in groove 2 and protruding cooperation, thereby has guaranteed the straightness that hangs down of casing 1 installation.

The camshaft 3 is arranged on the shell 1, the camshaft 3 is an existing commodity, the brake rocker arm 4 is of a double-arm structure, two ends of the brake rocker arm 4 are respectively connected with the camshaft 3 and an existing pneumatic cylinder, gas pressure is converted into mechanical energy to push the brake rocker arm 4 under the effect of the existing pneumatic cylinder, and the camshaft 3 is driven to rotate through the brake rocker arm 4.

A brake rocker arm 4 and a driving wheel 5 are respectively arranged at two ends of the camshaft 3, an adjusting gear is arranged inside the housing 1, the adjusting gear is meshed with the driving wheel 5, and the brake rocker arm 4 is used for driving the driving wheel 5 and the adjusting gear to rotate; the adjusting gear is connected with a push block 6.

Wherein, camshaft 3 rotates and drives drive wheel 5, and generally speaking, the turned angle of drive wheel 5 is less than 45 degrees, and drive wheel 5 can adopt local rack structure promptly, drives adjustment gear through drive wheel 5 and rotates, utilizes the transmission ratio to realize the multiturn of adjustment gear promptly and rotates, and wherein adjustment gear rotates and drives ejector pad 6 rotatory.

Referring to fig. 3, the brake shoe includes a positioning shaft 7 and two brake pads 8, one end of the brake pad 8 is movably mounted on the positioning shaft 7, so that the brake pads 8 are on the positioning shaft 7, the brake pads 8 extend to both sides during operation, although the friction area of the brake pads 8 is reduced compared with the contact area of the whole brake pads 8, the brake pads 8 are generally made by rolling steel or stamping and welding steel plates, but may also be made of malleable cast iron, nodular cast iron, cast steel or cast aluminum alloy, etc., in the design of the electric bicycle, the braking force can usually meet the use requirement, and the brake pads 8 are more stable in this way.

The other end of the brake block 8 is abutted against the push block 6, and the push block 6 is used for rotating and pushing the brake block 8 to open. The push block 6 is strip-shaped, and the push block 6 rotates to apply thrust to the brake shoe components on two sides of the push block. In the braking process, when the external impact stress is received, the force received by the brake block 8 does not reach the yield force of the material, but the stress on the brake block 8 is not uniform, and the static stress received at the edge is larger than that received at the middle part, so that the brake block 8 has better stability under the action of the push block 6 by line-to-surface braking.

It is worth noting that in the design process of the bicycle, the front disc brake device is usually provided to assist the emergency brake in consideration of the emergency state when necessary, so that the rear brake is preferably used to reduce the friction area to obtain better smoothness.

Based on the above embodiment, the utility model discloses a another embodiment is, is equipped with strengthening rib 9 on above-mentioned casing 1, and the welding of above-mentioned strengthening rib 9 one side is on casing 1, and 9 opposite sides of above-mentioned strengthening rib are fixed at draw-in groove 2 front end. The reinforcing ribs 9 at the front ends of the clamping grooves 2 are longitudinally arranged, so that load transmissibility is improved, the impact strength of the shell 1 and the electric bicycle bottom fork A is guaranteed in the braking process, and deformation risks are reduced.

Further, referring to fig. 1, screw holes are provided on the slot 2 and the protrusion, and a limit bolt 201 is provided in the screw hole. In this way, deformation of the brake main body due to the mechanical weld can be avoided as compared with the conventional direct welding. Simultaneously, the design of limit bolt 201 can consider to a certain extent to replace current welding mode to when guaranteeing the support performance, still be favorable to carrying out secondary maintenance and repacking.

Further, the brake pad 8 is provided with a transmission block 801, the transmission block 801 is provided with a through hole, the brake pad 8 is provided with a return spring 802, and both ends of the return spring 802 are respectively locked to the through hole of the transmission block 801. The return spring 802 is mainly used for facilitating the brake block 8 to be separated from the brake component, so that the brake block can be effectively reset after stopping applying work to the brake rocker arm 4.

The main body part of the brake is surrounded by the hub, and belongs to a closed or semi-closed design structure. This design is not conducive to dissipation of frictional heat energy generated during braking, and the braking effectiveness is limited by the actual contact area between the brake shoes and the brake drum.

The brake block 8 is used as a main working and stress part, and the temperature of the brake block 8 is easy to rise in the working process, so that the phenomena of deformation risk, brake recession, shake, brake efficiency reduction and the like are caused. Therefore, the transmission block 801 and the plurality of through holes on the brake pad 8 are beneficial to improving the heat radiation performance of the brake pad 8.

Further, the transmission piece 801 has a circular arc shape, and the transmission piece 801 is inclined toward the center axis of the brake pad 8. The transmission block 801 is used as a mechanical component, and friction of the hub needs to be removed from the transmission block 801, so that when the transmission block 801 performs friction braking, obvious mechanical vibration and mechanical noise may occur, and if the instantaneous load of the transmission block 801 is too large, the phenomenon of abrasion of mechanical components of the transmission block 801 may be aggravated, so that vibration, noise and smooth performance of the whole driving process are affected. The transmission block 801 is arc-shaped, so that the pulling process is smoother, the brake block 8 can obtain a friction coefficient of natural frequency, and the control of the whole fatigue vulnerability condition is facilitated, so that the service cycle of the brake block 8 is prolonged.

Further, a rocker shaft spring is arranged on one side of the brake rocker arm 4, and the rocker shaft spring is used for resetting the brake rocker arm 4. The brake rocker arm 4 may be returned by a rocker shaft spring after the brake shoe 8 is returned by the return spring 802 and the brake rocker arm 4 stops applying a tensile force. During the resetting process of the brake rocker arm 4, the adjusting gear and the push block 6 are reset.

Based on the above embodiment, the utility model discloses a another embodiment is, referring to fig. 2 and 4, above-mentioned adjusting gear includes driven gear 10 and function tooth 11, and above-mentioned driven gear 10 is connected with drive wheel 5 and function tooth 11 power respectively, and above-mentioned ejector pad 6 is the bar, and above-mentioned ejector pad 6 is arranged in on the function tooth 11, and above-mentioned function tooth 11 turned angle is less than 90 degrees, and above-mentioned function tooth 11 is used for driving ejector pad 6 synchronous rotation.

The push block 6 needs to maintain good support performance, generally, the push block 6 is made of solid materials, and if necessary, hollow steel with sufficient strength can be adopted, and if a solid structure is replaced by the hollow steel structure, the mass can be reduced, the material can be saved, and the cost can be reduced.

The driven gears 10 are fixed on the housing 1 through bearings, two adjacent driven gears 10 are meshed with each other, and the driven gears 10 are used for adjusting the transmission ratio of the functional gear 11 and the driving wheel 5. By increasing the number of the driven gears 10, the optimization of the transmission ratio is facilitated, i.e. a larger angle of oscillation of the push block 6 is achieved by a small angle of oscillation of the braking rocker arm 4. Therefore, the brake state can be adjusted to be a more ideal brake state according to the actual situation through parameter adjustment.

Reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," "a preferred embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general terms in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims (8)

1. A draw-in groove formula rear brake for electric bicycle, includes casing (1) and brake shoe, casing (1) is used for fixing on electric bicycle's fork, its characterized in that: the clamping groove (2) is formed in the shell (1), the clamping groove (2) corresponds to a protrusion on a bottom fork of the electric bicycle, the cam shaft (3) is arranged on the shell (1), a braking rocker arm (4) and a driving wheel (5) are arranged at two ends of the cam shaft (3) respectively, an adjusting gear is arranged on the inner side of the shell (1), the adjusting gear is meshed with the driving wheel (5), and the braking rocker arm (4) is used for driving the driving wheel (5) and the adjusting gear to rotate; the adjusting gear is connected with a push block (6); the brake shoe comprises a positioning shaft (7) and two brake blocks (8), one end of each brake block (8) is movably mounted on the positioning shaft (7), the other end of each brake block (8) abuts against the corresponding push block (6), and the push blocks (6) are used for rotating and pushing the brake blocks (8) to be opened.

2. The slot-in rear brake for electric bicycles of claim 1, characterized in that: the shell (1) is provided with a reinforcing rib (9), one side of the reinforcing rib (9) is welded on the shell (1), and the other side of the reinforcing rib (9) is fixed at the front end of the clamping groove (2).

3. The rear clamping groove brake for the electric bicycle according to claim 1, wherein: the clamping groove (2) and the protrusions are provided with screw holes, and limit bolts (201) are arranged in the screw holes.

4. The slot-in rear brake for electric bicycles of claim 1, characterized in that: the brake block (8) is provided with a transfer block (801), the transfer block (801) is provided with a through hole, the brake block (8) is provided with a return spring (802), and two ends of the return spring (802) are respectively locked on the through hole of the transfer block (801).

5. The rear clamping groove brake for the electric bicycle according to claim 4, wherein: the transmission block (801) is arc-shaped, and the transmission block (801) inclines towards the central axis of the brake block (8).

6. The slot-in rear brake for electric bicycles of claim 1, characterized in that: and a rocker shaft spring is arranged on one side of the brake rocker arm (4), and is used for resetting the brake rocker arm (4).

7. The rear clamping groove brake for the electric bicycle according to claim 1, wherein: the adjusting gear comprises a driven gear (10) and functional teeth (11), the driven gear (10) is in power connection with the driving wheel (5) and the functional teeth (11) respectively, the push block (6) is in a bar shape, the push block (6) is arranged on the functional teeth (11), the rotation angle of the functional teeth (11) is smaller than 90 degrees, and the functional teeth (11) are used for driving the push block (6) to rotate synchronously.

8. The bayonet rear brake for an electric bicycle of claim 7, wherein: the driven gears (10) are multiple, two adjacent driven gears (10) are meshed with each other, and the driven gears (10) are used for adjusting the transmission ratio of the functional teeth (11) and the driving wheel (5).

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