CN206187271U - Bicycle front chain wheel structure - Google Patents

Abstract

The utility model provides a bicycle front chain wheel structure, includes the frame, locates the five -way at frame middle part, be equipped with a dead eye in the five -way both sides, the dead eye diameter is greater than five -way bore diameter, form a step between dead eye and the five -way hole, install a bearing in the dead eye, install an axis in the five -way, well off -axial is located to the bearing housing, the axis surface is equipped with the many sand grips that are circumference evenly distributed, sand grip and axis body integrated into one piece, and many sand grips form the spline for the axis body at its both ends, the sand grip is laminated with the bearing inner wall mutually. The utility model discloses a bicycle front chain wheel structure need not five -way bowl group and just can stabilize the bearing in five -way both sides, reduces the resistance that the axis received, and the pedal drive bicycle of trampling that makes the personnel of riding relax removes, and need not to reprocess out the spline after the axis cutting, just can with the crank arm mount together.

Description

A kind of bicycle front wheel structure

Technical field

The utility model is related to a kind of bicycle front wheel structure.

Background technology

Preceding chain sprocket structure is the important feature in bicycle drive train system, and the quality of preceding chain sprocket structure is directly connected to voluntarily The quality of car, influence is ridden the impression of riding of personnel, preceding chain sprocket structure itself have at least one before sprocket wheel, and by chain and Sprocket wheel is connected after at least one, and preceding 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 then located at the end of crank arm, and the personnel that ride are by trampling pedal Crank arm is driven to rotate, sprocket wheel is rotated after always driving preceding sprocket wheel, finally realizes the movement of bicycle.

Axis is all mounted to the five of vehicle frame and leads to interior, in order to ensure the rotation of axis, then can be provided with axle in five logical both sides Hold, but because the limitation of technology, general bearing are first installed in fire-way axle bowl group, 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 cause bearing can be subject to five The extruding of logical bowl group inwall just can guarantee that the steadiness of bearing, and when fire-way axle bowl group is spirally connected logical interior into five, five logical 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, make the pressure that bearing is subject to, Therefore the resistance being subject to during middle shaft rotation can then become big, can then feel laborious when the personnel of riding trample pedal, easily accelerate to ride The speed tired out of administrative staff, it is impossible to which the personnel that make to ride are ridden for a long time.

Axis is then to cut spline by axis both sides with the connection of crank arm, and then crank arm is solid with spline assembling Fixed, this fixed form then needs that axis first is cut into actually required length, and axis two ends are processed again then, makes Spline is molded, and operation is very various, so as to cause axis cost to increase, adds somewhat to the production cost of bicycle.

The content of the invention

The technical problems to be solved in the utility model is to provide a kind of bicycle front wheel structure, it without fire-way axle bowl group just Bearing can be stabilized in five logical both sides, reduce the resistance suffered by axis, the personnel of riding easily is trampled pedal and drive Dynamic bicycle movement, and spline need not be reprocessed out after axis cutting, just can be fixed together with crank arm assembling.

The technical scheme in the invention for solving the above technical problem is：

The utility model discloses a kind of bicycle front wheel structure, including vehicle frame, in the middle part of vehicle frame five logical, its feature It is：A bearing hole is provided with described five logical both sides, bearing hole is with diameter greater than five logical diameter of bores；The bearing hole and five leads to interior A step is formed between hole；One bearing is installed in the bearing hole；Described five it is logical in an axis is installed, during bearing holder (housing, cover) is located at Outside axle；The axis outer surface is provided with many raised lines being circularly and evenly distributed, and raised line is integrally formed with middle shaft body, and many convex Bar forms spline relative to middle shaft body at its two ends；The raised line fits with bearing inner wall；The axis two ends are provided with song Shaft arm, crank arm is mutually fixed by the spline that raised line is formed with axis；The axis be provided with least one before sprocket wheel.

The bearing side is provided with a dirt-proof boot；The dirt-proof boot is provided with a mounting hole matched with axis, dust-proof It is sheathed on outside axis；The dirt-proof boot includes the fixed part that occlusion part, occlusion part side extend；The occlusion part is by axle Outside is held to block；The fixed part fits with bearing inner wall；T fonts are formed between the occlusion part and fixed part.

The beneficial effects of the utility model are：

Compared with prior art, it is mounted directly by by bearing using the bicycle front wheel structure of the utility model structure The personnel of riding not only are made to drive the bicycle to become more easily in five logical assembling modes, the carrying out for being capable of long-time long range is ridden OK, and with the reduction of fire-way axle bowl group, parts are also reduced therewith, are used to connect without internal thread is processed in leading to five again Connect, save parts, decrease manufacturing procedure, reduce the production cost of preceding chain sprocket structure, the utility model is being reduced While production cost, the superiority of preceding chain sprocket structure is improved on the contrary, makes the performance and cost performance of preceding chain sprocket structure Maximum lifting is obtained.

Compared with prior art, using the bicycle front wheel structure of the utility model structure without again to cutting down Axis carries out the operation of spline processing, and crank arm just can complete assembling and fix by the raised line on axis surface with axis, by subtracting The operation of few spline processing, is minimized the production cost of axis, the final production cost for reducing preceding chain sprocket structure.

Brief description of the drawings

Fig. 1 is the profile of the utility model bicycle front wheel structure；

Fig. 2 is the structural representation of the utility model bicycle front wheel structure；

Fig. 3 is the stereogram of the utility model bicycle front wheel structure.

Specific embodiment

The utility model is described in further detail with reference to the accompanying drawings and detailed description：

Refer to Fig. 1 to Fig. 3, the utility model provides a kind of bicycle front wheel structure, including vehicle frame 1, located at vehicle frame 1 The five of middle part logical 2, and a bearing hole 3 is provided with described five logical 2 both sides, and bearing hole 3 is with diameter greater than five logical 2 diameter of bores；The axle A step 4 is formed between logical 2 endoporus of bearing bore 3 and five；A bearing 5 is installed in the bearing hole 3；It is provided with described five logical 2 One axis 6, bearing 5 is sheathed on outside axis 6；The outer surface of the axis 6 is provided with many raised lines 7 being circularly and evenly distributed, raised line 7 With 6 body by integral forming of axis, many raised lines 7 are relative to the body of axis 6 in its two ends formation spline；The raised line 7 and bearing 5 Inwall fits；The two ends of the axis 6 are provided with crank arm 8, and crank arm 8 is mutually fixed by the spline that raised line 7 is formed with axis 6； The axis 6 be provided with least one before sprocket wheel 9.

The side of the bearing 5 is provided with a dirt-proof boot 10；The dirt-proof boot 10 is provided with a mounting hole matched with axis 6 11, dirt-proof boot 10 is sheathed on outside axis 6；The dirt-proof boot 10 includes the fixation that occlusion part 12, the side of occlusion part 12 extend Portion 13；The occlusion part 12 blocks bearing outside；The fixed part 13 fits with the inwall of bearing 5；The occlusion part 12 with T fonts are formed between fixed part 13.

Application method of the present utility model is as follows：

Bearing 5 is directly installed in five logical 2 both sides of vehicle frame 1 by bearing hole 3, by bearing hole 3 and five lead to 2 endoporus it Between formed step 4 can then limit the inward displacement of bearing 5, the stability of bearing 5 is protected, due to need not pass through fire-way axle bowl Group is installed to bearing 5, therefore bearing 5 is stabilized in while in five logical 2, and the pressure being subject to is minimum, and axis 6 can be in bearing Easily rotated in the presence of 5, as long as the personnel that ride gently trample pedal, just easily axis 6 can be driven, make to be arranged Rotated with sprocket wheel 9 before at least one on axis 6, and preceding sprocket wheel 9 then can drive bicycle under the transmission of the power of chain On rear sprocket wheel rotate, bicycle is moved, bearing 5 is directly mounted at five logical 2 assembling mode not only The personnel of riding are made to drive the bicycle to become more easily, the carrying out for being capable of long-time long range is ridden, and with fire-way axle bowl group Reduce, parts are also reduced therewith, be used to connect without internal thread is processed in five logical 2 again, save parts, also subtract Lacked manufacturing procedure, reduced the production cost of preceding chain sprocket structure, the utility model while production cost is reduced, preceding sprocket wheel The superiority of structure is improved on the contrary, the performance and cost performance of preceding chain sprocket structure has been obtained maximum lifting.

The outer surface of axis 6 is provided with many raised lines 7 being circularly and evenly distributed, raised line 7 and 6 body by integral forming of axis, because This raw material that initial surface need to be just provided with raised line 7 cuts into the actually required length of axis 6, and can just cut out to use Axis 6, the surface of axis 6 for cutting out equally have many raised lines 7 being circularly and evenly distributed, and many raised lines 7 relative to The body of axis 6 forms spline at its two ends, and the operation of spline processing is carried out without the axis 6 again to cutting down, and crank arm 8 leads to The raised line 7 for crossing the surface of axis 6 just can complete assembling fixation with axis 6, by reducing the operation that spline is processed, make the life of axis 6 Produce cost to be minimized, the final production cost for reducing preceding chain sprocket structure, and raised line 7 traverses the body of whole axis 6 in itself, works as axle Hold 5 be sheathed on axis 6 it is outer when, raised line 7 can come in contact with the inwall of bearing 5, and the presence of raised line 7 can increase axis 6 and bearing 5 Between friction level, so as to increase steadiness between the two, become more stable the rotation of axis 6.

The side of bearing 5 is provided with dirt-proof boot 10, and dirt-proof boot 10 is provided with the mounting hole 11 matched with axis 6, dirt-proof boot 10 It is sheathed on outside axis 6, dirt-proof boot 10 includes the fixed part 13 that occlusion part 12, the side of occlusion part 12 extend, occlusion part 12 will The outside of bearing 5 is blocked, and the presence of occlusion part 12 can effectively prevent dust and other impurities from entering into causes the bearing 5 cannot in bearing 5 Normal operation is rolled, also can when rainy or by puddle environment when, bearing 5 is interior to cause bearing 5 to go out to prevent water droplet to be splashed into The existing situation of rust, and dirt-proof boot 10 be sheathed on axis 6 it is outer when, axis 6 can give fixed part 13 1 pressure, make fixed part 13 can with the inwall of bearing 5 fitting tightly, due to forming T fonts between occlusion part 12 and fixed part 13, therefore with fixed part 13 fixation, stability when ensure that occlusion part 12 blocks 5 side of bearing, makes dust-proof effect be protected.

Claims (2)

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

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