CN205837102U - A kind of rear arm of electric bicycle - Google Patents

Abstract

A kind of electric bicycle rear arm, the right rear arm arranged including separable V-arrangement and left back rocking arm, right rear arm and left back rocking arm have identical symmetrical structure, left back rocking arm and right rear arm include horizontal flat section plate portion and the declivity section plate portion of one respectively, declivity section plate portion is at horizontal flat section plate portion rear downward-sloping, being provided with rocking arm polymeric components and amortisseur connection member on the top plan of horizontal flat section plate portion, the end of declivity section plate portion is provided with the pivot joint portion for connecting trailing wheel.Electric bicycle rear arm of the present utility model uses aluminum titanium alloy casting, and by being pivotally connected on vehicle frame, flexible by amortisseur feeds back on rear arm, reasonably it is assigned with the weight that wheel is born, both ensured the rigidity of vehicle frame, absorbed again unnecessary vibrations, and made vehicle keep stable.

Description

A rear rocker arm of an electric bicycle

technical field

The utility model relates to a suspension device of an electric bicycle, in particular to a rear rocker arm of the electric bicycle.

Background technique

At present, people are using more and more electric bicycles in short-distance traffic. Compared with automobiles, electric bicycles are energy-saving, convenient, and non-congested. Compared with bicycles, they have speed advantages and save time and effort. transportation. As a result, people have put forward higher requirements for the safety and comfort of electric bicycles. The design of electric bicycle in the prior art is mainly to refer to, carry out in conjunction with the structure of bicycle and motorcycle, and what have directly installs power unit on the structural framework of bicycle, or is refitted as electric drive under the structural framework of motorcycle.

The suspension system of the existing electric bicycle generally refers to the design of the motorcycle, including a rear rocker arm and two spring shock absorbers respectively installed on both sides of the rear wheel. The main function of the rear rocker arm is to connect the frame, rear wheel and rear shock absorber. It is the main force-bearing part in the suspension system and plays an important role in maintaining the good dynamic performance of the vehicle. The force on the rear rocker arm is more complicated during the driving process of the vehicle, and the strength it bears is also relatively large. When the vehicle is started, it bears the forward driving force, when the vehicle brakes, it bears the drag force and swing torque of the rear wheel, and absorbs it when turning. Unwanted vibrations from uneven road surfaces. During use, it often happens that the rear rocker shaft hole buffer sleeve wears excessively, causing the rear rocker arm and the frame to not be on the same horizontal plane, and the rear rocker arm is easily deformed, resulting in the rear wheel not being on the same plane as the front wheel, causing rear The wheel deviates.

Therefore, the design of the rear rocker arm of an electric bicycle cannot completely refer to the structure of bicycles and motorcycles, and needs to be designed according to the driving and weight characteristics of the electric bicycle itself.

Utility model content

Based on the above reasons, the utility model provides an electric bicycle rear rocker arm with simple structure and good performance, including a right rear rocker arm and a left rear rocker arm. The right rear rocker arm and the left rear rocker arm have the same symmetrical structure. The rocker arm and the right rear rocker arm respectively include an integral horizontal plate-like portion and a down-sloping plate-shaped portion. The rocker arm aggregation part and the shock absorber connection part are arranged on the plane, and the end of the plate-like part of the down slope section is provided with a pivot joint for connecting the rear wheel.

In addition, the horizontal planar section plate-shaped part and the descending inclined section plate-shaped part of the left rear rocker arm and the right rear rocker arm form an angle of 135° on both axes.

Specifically, the rocker arm aggregation part and the shock absorber connecting part are convex parts, and the shock absorber connecting part is arranged at the front end of the top plane of the plate-shaped part of the horizontal section of the rear rocker arm, and the rocker arm aggregation part and the shock absorber connecting part It can be a connecting part with a through hole arranged horizontally, the connecting part of the shock absorber can be a connecting part with a through hole arranged horizontally, and the connecting part of the shock absorber has a semicircular notch penetrating into the through hole toward the inner side of the front end of the rear rocker arm . The protruding top end of the shock absorber connection part also has an asymptotic connection part toward the top plane of the horizontal flat section plate-shaped part of the rear end, and the rocker arm aggregation part is arranged on the asymptotic connection part.

In addition, the plate-shaped part of the horizontal flat section and the plate-shaped part of the downward slope section are hollow shells, including the outer side plate of the plate-shaped part and the top side plate and bottom side plate of the outer side plate surrounding the plate-shaped part.

Preferably, in the hollow space defined by the side plates, a plurality of intersecting reinforcing ribs are arranged on the inner side of the side walls to divide the hollow shell into a plurality of triangular regions.

The rear rocker arm of the electric bicycle of the utility model is casted by aluminum-titanium alloy, connected on the frame by a pivot, and fed back to the rear rocker arm through the expansion and contraction of the shock absorber, and reasonably distributes the weight borne by the wheel, thereby providing the electric bicycle It provides better grip, track tracking and stability, not only guarantees the rigid frame, but also absorbs excess vibration to keep the vehicle stable.

Description of drawings

Fig. 1 is the perspective view of the rear rocker arm of the electric bicycle of the present utility model;

Fig. 2 is the top view of the rear rocker arm of the electric bicycle of the present utility model;

Fig. 3 is a side view of the rear rocker arm of the electric bicycle of the present utility model;

Fig. 4 is a diagram of the use state of the rear rocker arm of the electric bicycle of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. However, those skilled in the art know that the utility model is not limited to the accompanying drawings and the following embodiments.

As shown in Figures 1-3, the electric bicycle rear rocker arm of the present utility model includes: a right rear rocker 1 and a left rear rocker 2 that can be separated in a V shape, and the right rear rocker 1 and the left rear rocker 2 have The same symmetrical structure, here we take the left rear rocker as an example to illustrate its structure. The left rear rocker arm 2 includes an integrated horizontal flat section (roughly horizontal in use state, slightly forward) plate-shaped part 21 and a downward inclined section plate-shaped part 22, the downward inclined section plate-shaped part 22 is behind the horizontal flat section plate-shaped part 21, And relative to the plate-shaped part 22 of the descending section, it is inclined downward, and the 125-145 ° included angle formed on the two axes, preferably 135 ° included angle, due to the design of the included angle, increases the Reinforced structure of the swingarm. On the top plane of the plate portion 21 of the horizontal flat section, a rocker aggregation part 23 and a shock absorber connection part 24 are arranged. The rocker arm aggregation part 23 and the shock absorber connection part 24 are convex parts, and the shock absorber connection part 24 is set At the top most front end of the horizontal planar section 21 of the rear rocker arm. When the left and right rear rocker arms converge, the rocker arm aggregation part and the shock absorber connecting part of the left and right rear rocker arms are mutually matched, and are pivotally connected with the vehicle frame 3 and the spring shock absorber 4 respectively through the connecting rod. The end portion of the plate portion 22 of the descending slope section is provided with a pivot joint 29 for connecting the rear wheel.

In this embodiment, the rocker arm aggregation part 23 and the shock absorber connecting part 24 are connecting parts with through holes arranged laterally. Correspondingly, the rear rocker arm of the present invention is pivotally connected to the electric bicycle frame 3 through the connecting rod passing through the aggregation parts of the left and right rocker arms. The shock absorber connecting part 24 has a semicircular notch 25 penetrating through the through hole toward the inner side of the front end of the rear rocker arm. When the left and right rear rocker arms converge, the respective semicircular notches of the left and right rear rocker arms cooperate to form the end of the spring shock absorber 4. The round hole of the spring shock absorber 4 thus cooperates with the connecting rod passing through the left and right shock absorber connecting parts, thereby connecting the rear rocker arm to the spring shock absorber 4. When the vehicle is running, when the vehicle receives bumps, the rear rocker arm can rotate around the pivot connected to the frame 3 through the left and right rocker arm aggregation parts, so that the connecting rods in the left and right rocker arm shock absorber connecting parts push the shock absorber. The shock absorber expands and contracts, thereby reducing the vibration received by the electric bicycle and improving the user's comfort.

Specifically, the protruding top end of the shock absorber connection part 24 also has an asymptotic connection part 26 toward the top plane of the horizontal flat section plate-shaped part 21 at the rear end, and the rocker arm aggregation part 23 can be arranged on the asymptotic connection part 26, thereby The connection strength between the rocker aggregation part 23 and the shock absorber connection part 24 and the horizontal flat section plate part 21 is improved, so that the rocker aggregation part can be raised by means of the progressive connection part 26 without increasing the connection parts. 23, it is convenient to adjust the position of the rocker aggregation part 23 according to different vehicle models. After the rear rocker arm is installed on the vehicle frame and connected with the spring shock absorber, generally the connecting rod installation holes of the rocker arm aggregation part 23 and the shock absorber connecting part 24 are on the axis extension line of the spring shock absorber.

In order to reduce the weight of the rear rocker while ensuring the overall strength and tensile strength of the rear rocker, the plate-shaped part 21 of the horizontal section and the plate-shaped part 22 of the downward slope of the rear rocker in this embodiment are hollow shells, including In the hollow space defined by the above-mentioned side plates, the outer side plate of the plate-shaped part of the horizontal flat section and the top side plate and the side plate of the outer side plate surrounding the plate-shaped part of the horizontal flat section are provided with a plurality of reinforcing ribs 27, and the hollow shell Divided into multiple triangular areas, thereby increasing the strength of the plate-shaped part of the horizontal section of the rear rocker arm. In addition, there are corrugated rounded corners 28 on the outer side walls of the horizontal planar section 21 of the rear rocker.

The rear wheel pivot joint 29 is arranged at the end of the plate-shaped portion 22 of the downward slope, and includes an auxiliary component connecting hole and a U-shaped fork for inserting the rear wheel shaft. For the convenience of installation and aesthetics, the rear wheel pivot joint Another plane is formed by indenting downward from the surface of the plate-like portion 22 of the descending slope.

In addition, the rear rocker arm is also provided with a plurality of connection pieces 5 for connecting rear wheel attachment parts.

As mentioned above, embodiment of this invention was described. However, this invention is not limited to said embodiment. All modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims (8)

1. an electric bicycle rear arm, including separable V-arrangement arrange right rear arm and left back rocking arm, right rear arm and Left back rocking arm has identical symmetrical structure, it is characterised in that:

Left back rocking arm and right rear arm include horizontal flat section plate portion and declivity section plate portion, the declivity section tabular of one respectively Part, at horizontal flat section plate portion rear downward-sloping, is provided with rocking arm polymerization on the top plan of horizontal flat section plate portion Parts and amortisseur connection member, the end of declivity section plate portion is provided with the pivot joint portion for connecting trailing wheel.

Electric bicycle rear arm the most according to claim 1, it is characterised in that: left back rocking arm and the horizontal of right rear arm are put down Section plate portion and declivity section plate portion form the angle of 135 ° on both axis.

Electric bicycle rear arm the most according to claim 1, it is characterised in that: rocking arm polymeric components and amortisseur connect Parts are protruding part, and amortisseur connection member is arranged on the top planes of the horizontal flat section plate portion of rear arm foremost.

Electric bicycle rear arm the most according to claim 3, it is characterised in that: rocking arm polymeric components and amortisseur connect Parts are the connection member of the through hole with horizontally set.

Electric bicycle rear arm the most according to claim 3, it is characterised in that: amortisseur connection member is for having laterally The connection member of through hole arranged, amortisseur connection member has towards the inner side of rear arm front end and is penetrated into the semicircle of through hole and lacks Mouthful.

6. according to the electric bicycle rear arm one of claim 3-5 Suo Shu, it is characterised in that: from amortisseur connection member Protruding apex also has the asymptotic connecting portion of the top plan of the horizontal flat section plate portion towards rear end, and rocking arm polymeric components is arranged On asymptotic connecting portion.

Electric bicycle rear arm the most according to claim 1, it is characterised in that: horizontal flat section plate portion and declivity section plate Shape part is hollow housing, including side plate top side plate, bottom side plate outside side plate outside plate portion and encirclement plate portion.

Electric bicycle rear arm the most according to claim 7, it is characterised in that: absolutely empty in being limited by described side plate In between, described side plate interior sides is provided with the reinforcement of a plurality of intersection, hollow housing is divided into multiple delta-shaped region.