CN106394795A

CN106394795A - Front chain wheel structure of bicycle

Info

Publication number: CN106394795A
Application number: CN201611020486.0A
Authority: CN
Inventors: 李恩斌
Original assignee: Zhejiang Lightning Vehicle Co Ltd
Current assignee: Zhejiang Lightning Vehicle Co Ltd
Priority date: 2016-11-21
Filing date: 2016-11-21
Publication date: 2017-02-15

Abstract

A front chain wheel structure of a bicycle comprises a frame and a five-way joint arranged in the middle of the frame. The two sides of the five-way joint are internally provided with a bearing hole with the diameter larger than the diameter of a five-way joint inner hole; a step is formed between the bearing hole and the five-way joint inner hole; the bearing hole is internally provided with a bearing; the five-way joint is internally provided with a middle shaft which is sleeved with a bearing sleeve; the outer surface of the middle shaft is provided with multiple circumferentially distributed protruding strips; the protruding strips and a middle shaft body are integrated as a whole; splines are formed at the two ends of the middle shaft body by the protruding strips relative to the middle shaft body; and the protruding strips are attached to the inner wall of the bearing. According to the front chain wheel structure of the bicycle, the bearing can be stably arranged in the two sides of the five-way joint without a five-way bowl set, and resistance to the middle shaft is lowered so that a rider can easily pedal to drive the bicycle to move; and the middle shaft and a crank arm can be fixedly assembled together without machining of splines after the middle shaft is cut.

Description

A kind of bicycle front wheel structure

Technical field

The present invention relates to a kind of bicycle front wheel structure.

Background technology

Front chain sprocket structure is the important feature in bicycle drive train system, and the quality of front chain sprocket structure is directly connected to voluntarily The quality of car, impact is ridden the impression of riding of personnel, and front chain sprocket structure itself has sprocket wheel before at least one, and by chain and After at least one, sprocket wheel is connected, and front chain sprocket structure is typically all directly to be connected with the axis in bicycle driving device, and Axis two ends have then been respectively fixedly connected with crank arm, and pedal is then located at the end of crank arm, and the personnel that ride are by trampling pedal Crank arm is driven to rotate, after so that front sprocket wheel is driven, sprocket wheel rotates, and finally realizes the movement of bicycle.

Axis be all mounted to vehicle frame five logical in, in order to ensure the rotation of axis, then in five logical both sides, axle can be installed Hold, but the restriction due to technology, general bearing is all first to be installed in fire-way axle bowl group, and then fire-way axle bowl group is bolted in five respectively Logical both sides, last axis be through at five pass to and its bearing of both sides in, this bearing mounting means lead to bearing can be subject to five The steadiness of the extruding guarantee bearing of logical bowl group inwall, and when fire-way axle bowl group be spirally connected into five logical in when, five lead to inwalls can be right Fire-way axle bowl group produces pressure, and this strand of pressure can be applied on the bearing in fire-way axle bowl group, makes the pressure that bearing is subject to, Therefore middle shaft rotation when the resistance that is subject to then can become big, then can feel when the personnel of riding trample pedal laborious, easily accelerate to ride The speed tired out of administrative staff is it is impossible to make the personnel of riding be ridden for a long time.

Axis is then by cutting spline in axis both sides with the connection of crank arm, and then crank arm is solid with spline assembling Fixed, this fixed form then needs first axis to be cut into actually required length, then axis two ends is processed again, makes Spline molding, operation is very various, thus leading to axis cost to increase, adds somewhat to the production cost of bicycle.

Content of the invention

The technical problem to be solved in the present invention is to provide a kind of bicycle front wheel structure, and it just can be by without fire-way axle bowl group Bearing is stabilized in five logical both sides, reduces the resistance suffered by axis, enables the personnel of riding easily to trample pedal and drives certainly Driving is moved, and need not reprocess out spline after axis cutting, just can be fixed together with crank arm assembling.

The present invention solve above-mentioned technical problem adopt technical scheme be：

The present invention discloses a kind of bicycle front wheel structure, including vehicle frame, in the middle part of vehicle frame five logical it is characterised in that：Institute State in five logical both sides and be provided with a dead eye, dead eye leads to diameter of bore with diameter greater than five；Between described dead eye and five logical endoporus Form a step；Described bearing in the hole is provided with a bearing；Described five logical in an axis is installed, bearing holder (housing, cover) is outside axis； Described axis outer surface is provided with the many raised lines being circularly and evenly distributed, and raised line is integrally formed with middle shaft body, many raised line phases At its two ends, spline is formed for middle shaft body；Described raised line and bearing inner wall fit；Described axis two ends are provided with crank arm, The spline that crank arm is formed by raised line is fixed with axis phase；Described axis is provided with sprocket wheel before at least one.

Described bearing side is provided with a dirt-proof boot；Described dirt-proof boot is provided with an installing hole matching with axis, dust-proof It is sheathed on outside axis；The fixed part that described dirt-proof boot includes occlusion part, occlusion part side is extended；Described occlusion part is by axle Hold outside to block；Described fixed part and bearing inner wall fit；Form T font between described occlusion part and fixed part.

The invention has the beneficial effects as follows：

Compared with prior art, the bicycle front wheel structure using present configuration is logical by bearing is directly mounted at five Assembling mode not only makes the personnel of riding drive bicycle to become more light, and the carrying out being capable of distance for a long time is ridden, and with The minimizing of fire-way axle bowl group, parts also reduce therewith, without processing female thread in order to connect in five is logical again, save Parts, decrease manufacturing procedure, reduce the production cost of front chain sprocket structure, and the present invention is reducing the same of production cost When, the superiority of front chain sprocket structure is improved on the contrary, makes the performance of front chain sprocket structure and cost performance obtain maximum journey The lifting of degree.

Compared with prior art, the bicycle front wheel structure using present configuration need not be again to the axis cutting down Carry out the operation of spline processing, crank arm just can complete assembling with axis by the raised line on axis surface and fix, and spend by reducing The operation of key processing, makes the production cost of axis be minimized, the production cost of chain sprocket structure before final reduction.

Brief description

Fig. 1 is the profile of bicycle front wheel structure of the present invention；

Fig. 2 is the structural representation of bicycle front wheel structure of the present invention；

Fig. 3 is the axonometric chart of bicycle front wheel structure of the present invention.

Specific embodiment

The present invention is further detailed explanation with reference to the accompanying drawings and detailed description：

Refer to Fig. 1 to Fig. 3, the present invention provides a kind of bicycle front wheel structure, include vehicle frame 1, in the middle part of vehicle frame 1 five Logical 2, it is provided with a dead eye 3 in described five logical 2 both sides, dead eye 3 leads to 2 diameter of bores with diameter greater than five；Described dead eye 3 and five Form a step 4 between logical 2 endoporus；One bearing 5 is installed in described dead eye 3；In described five logical 2, an axis 6, axle are installed Hold 5 to be sheathed on outside axis 6；Described axis 6 outer surface is provided with the many raised lines being circularly and evenly distributed 7, raised line 7 and axis 6 Body by integral forming, many raised lines 7 form spline with respect to axis 6 body at its two ends；Described raised line 7 is affixed with bearing 5 inwall Close；Described axis 6 two ends are provided with crank arm 8, and the spline that crank arm 8 is formed by raised line 7 and axis 6 are mutually fixed；Described axis 6 It is provided with sprocket wheel 9 before at least one.

Described bearing 5 side is provided with a dirt-proof boot 10；Described dirt-proof boot 10 is provided with an installing hole matching with axis 6 11, dirt-proof boot 10 is sheathed on outside axis 6；The fixation that described dirt-proof boot 10 includes occlusion part 12, occlusion part 12 side is extended Portion 13；Described occlusion part 12 blocks outside bearing；Described fixed part 13 is fitted with bearing 5 inwall；Described occlusion part 12 with Form T font between fixed part 13.

The using method of the present invention is as follows：

By dead eye 3, bearing 5 is directly installed in five logical 2 both sides of vehicle frame 1, by shape between dead eye 3 and five logical 2 endoporus The step 4 becoming then can limit bearing 5 inward displacement, so that the stability of bearing 5 is protected, due to need not pass through fire-way axle bowl group pair Bearing 5 is installed, and while therefore bearing 5 is stabilized in five logical 2, the pressure being subject to is minimum, and axis 6 can be in bearing 5 Easily rotate under effect, as long as the personnel that ride gently trample pedal, just easily axis 6 can be driven, make to be sheathed on Before at least one on axis 6, sprocket wheel 9 rotates with, and front sprocket wheel 9 then can drive on bicycle under the power of chain transmits Rear sprocket wheel rotate, so that bicycle is moved, the assembling mode that bearing 5 is directly mounted at five logical 2 not only makes The personnel of riding drive bicycle to become more light, and the carrying out being capable of distance for a long time is ridden, and subtracting with fire-way axle bowl group Few, parts also reduce therewith, without processing female thread in order to connect in five logical 2 again, save parts, also reduce Manufacturing procedure, reduces the production cost of front chain sprocket structure, the present invention while reducing production cost, front chain sprocket structure Superiority is improved on the contrary, makes the performance of front chain sprocket structure and cost performance obtain maximum lifting.

Axis 6 outer surface is provided with the many raised lines being circularly and evenly distributed 7, raised line 7 and 6 body by integral forming of axis, because The raw material that initial surface need to be just provided with raised line 7 by this cuts into the actually required length of axis 6, just can cut out and can use Axis 6, axis 6 surface cutting out equally has the many raised lines being circularly and evenly distributed 7, and many raised lines 7 with respect to Axis 6 body forms spline at its two ends, and need not the axis 6 cutting down be carried out with the operation of spline processing again, and crank arm 8 leads to The raised line 7 crossing axis 6 surface just can complete assembling fixation with axis 6, by reducing the operation of spline processing, makes the life of axis 6 Produce cost to be minimized, the production cost of chain sprocket structure before final reduction, and raised line 7 traverses whole axis 6 body in itself, works as axle Hold 5 be sheathed on axis 6 outer when, raised line 7 can be come in contact with bearing 5 inwall, and the presence of raised line 7 can increase axis 6 and bearing 5 Between friction level, thus increasing steadiness between the two, so that the rotation of axis 6 is become more stable.

Bearing 5 side is provided with dirt-proof boot 10, and dirt-proof boot 10 is provided with the installing hole 11 matching with axis 6, dirt-proof boot 10 It is sheathed on outside axis 6, the fixed part 13 that dirt-proof boot 10 includes occlusion part 12, occlusion part 12 side is extended, occlusion part 12 will Block outside bearing 5, the presence of occlusion part 12 can effectively prevent from dust and other impurities from entering in bearing 5 leading to the bearing 5 cannot Normal operation rolls, and also water droplet can be prevented to be splashed in bearing 5 and lead to bearing 5 to go out when rainy or when the environment of puddle The now situation of rust, and dirt-proof boot 10 be sheathed on axis 6 outer when, axis 6 can give fixed part 13 1 pressure, makes fixed part 13 can with bearing 5 inwall fitting tightly, due to forming T font between occlusion part 12 and fixed part 13, therefore with fixed part 13 fixation, ensure that occlusion part 12 blocks stability during bearing 5 side, so that dust-proof effect is protected.

Claims

1. a kind of bicycle front wheel structure, including vehicle frame, in the middle part of vehicle frame five logical it is characterised in that：Described five logical two It is provided with a dead eye, dead eye leads to diameter of bore with diameter greater than five in side；Form one between described dead eye and five logical endoporus Rank；Described bearing in the hole is provided with a bearing；Described five logical in an axis is installed, bearing holder (housing, cover) is outside axis；Described axis Outer surface is provided with the many raised lines being circularly and evenly distributed, and raised line is integrally formed with middle shaft body, and many raised lines are with respect to axis Body forms spline at its two ends；Described raised line and bearing inner wall fit；Described axis two ends are provided with crank arm, and crank arm leads to The spline that excess convexity bar is formed is fixed with axis phase；Described axis is provided with sprocket wheel before at least one.

2. a kind of bicycle front wheel structure according to claim 1 it is characterised in that：Described bearing side is provided with one and prevents Dirt set；Described dirt-proof boot is provided with an installing hole matching with axis, and dirt-proof boot is sheathed on outside axis；Described dirt-proof boot includes The fixed part that occlusion part, occlusion part side are extended；Described occlusion part blocks outside bearing；In described fixed part and bearing Wall fits；Form T font between described occlusion part and fixed part.