CN218141967U - Connecting and combining structure for middle shaft and chain wheel - Google Patents

Abstract

The utility model provides a axis, sprocket connection integrated configuration, including axis, sprocket, the axis includes the axis body, sets up a square cylinder at the right-hand member of axis body, and square cylinder forms spacing step with the junction of axis body, and the sprocket middle part is provided with the quad slit corresponding with square cylinder, and the sprocket passes through the quad slit cover to be put on square cylinder, and is provided with the locking mechanism with the sprocket roof pressure on spacing step on square cylinder. The locking mechanism in the combined structure realizes simple assembling operation process of the chain wheel on the middle shaft, thereby being beneficial to improving the assembling efficiency of the middle shaft and the chain wheel.

Description

Connecting and combining structure for middle shaft and chain wheel

Technical Field

The utility model belongs to the technical field of the electric bicycle technique and specifically relates to a axis, sprocket connection integrated configuration.

Background

The electric bicycle is convenient to travel and has higher running speed than the bicycle, so that the electric bicycle is widely applied to daily short-distance commuting. Technical safety regulations for electric bicycles (17761-2018) have been implemented in 2019 on 4, 15 days, (17761-2018) standard requires: the electric two-wheeled bicycle has the pedal riding capability and can realize the functions of electric power assistance or/and electric drive. The existing electric vehicle generally realizes the pedal riding capability through a five-way component, wherein a chain wheel is arranged on a middle shaft, and the middle shaft supports the rotation of the chain wheel. At present, when a chain wheel is installed on a center shaft, the chain wheel is generally fixed with the center shaft by using a locking lug on the chain wheel, when the chain wheel is installed on the center shaft, the chain wheel and the locking lug are firstly sleeved on the center shaft, then the chain wheel and the locking lug are rotated, a through hole on the locking lug corresponds to a groove on the center shaft, after the chain wheel is correspondingly arranged in place, a locking pin with a plane is inserted into the through hole and the groove, the plane of the locking pin is attached to the plane of the groove, then, a nut is sleeved on the other end of the locking pin and screwed, and then the chain wheel is fixed on the center shaft.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a bearing, sprocket connection integrated configuration, locking mechanism in this integrated configuration realizes that the sprocket is simple at epaxial assembly operation process, so do benefit to the assembly efficiency who improves axis and sprocket.

The utility model provides a technical scheme that its technical problem adopted is: a middle shaft and chain wheel connecting and combining structure comprises a middle shaft and a chain wheel, wherein the middle shaft comprises a middle shaft body, a square cylinder is arranged at the right end of the middle shaft body, a limiting step is formed at the joint of the square cylinder and the middle shaft body, a square hole corresponding to the square cylinder is formed in the middle of the chain wheel, the chain wheel is sleeved on the square cylinder through the square hole, and a locking mechanism for pressing the chain wheel on the limiting step is arranged on the square cylinder.

Preferably, locking mechanism includes square sleeve pipe, fitting pin, lock nut, square sleeve pipe cover is put on the square column body, the fitting pin runs through square sleeve pipe and square column body, lock nut is in the tightening realization on the fitting pin square sleeve pipe is fixed on the square column body, and square sleeve pipe's left side wall top presses on the right side wall of sprocket.

Furthermore, a wedge-shaped hole penetrating through the upper side wall is formed in the upper side wall of the square sleeve, a long and far hole corresponding to the wedge-shaped hole is formed in the lower side wall of the square sleeve, and the long and far hole penetrates through the lower side wall; the locking pin includes with wedge hole matched with wedge block the fixed threaded rod that sets up in lower part of wedge block set up one be used for on the square column body the perforating hole that the threaded rod runs through.

Preferably, the square sleeve is made of nylon material.

Preferably, the middle shaft body and the square column body are of an integrated structure.

Preferably, the central shaft is a hollow tube.

The utility model has the advantages that: the utility model has simple structure and convenient processing and manufacturing; when the locking pin is used for fixing the square sleeve on the square column body, the wedge-shaped hole corresponds to the through hole, then the square sleeve is sleeved on the square column body, the locking pin is inserted into the wedge-shaped hole and the through hole, and the locking nut is screwed on the threaded rod, so that the square sleeve is fixed on the square column body; after the wedge block is inserted into the wedge hole, the wedge hole has a rotation limiting effect on the wedge block, so that when the locking nut is screwed, the threaded rod cannot rotate, and then the locking efficiency can be improved; furthermore, the square sleeve is processed by nylon materials, the weight of the square sleeve is smaller than that of the existing locking lug while the structural strength is ensured, so that the weight reduction design of the electric vehicle is convenient to realize, and meanwhile, the weight reduction design of the electric vehicle can also be realized because the middle shaft is a hollow shaft; the quad slit of sprocket cooperatees with square cylinder, realizes then that the rotation of sprocket and square cylinder is spacing, and spacing step and square sheathed tube combination can realize that the sprocket is spacing in the axial on square cylinder, can realize then the fixed mounting of sprocket on square cylinder.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are part of the preferred embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a side view of the overall structure of the present invention;

fig. 3 is a longitudinal sectional view of the present invention with a partial structure;

FIG. 4 is a schematic view of the connection between the bottom bracket body and the square column;

FIG. 5 is a front view of the sprocket;

in the figure: the middle shaft 1, the middle shaft 11, the square column 12, the 121 limit step, the 122 through hole, the 2 chain wheel, the 21 square hole, the 31 square sleeve, the 311 wedge-shaped hole, the 312 long round hole, the 32 locking pin, the 321 wedge-shaped block, the 322 threaded rod and the 33 locking nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following specific embodiments and accompanying drawings 1 to 5, and it is obvious that the described embodiments are only a part of the preferred embodiments of the present invention, and not all embodiments. Those skilled in the art can make similar variations without departing from the spirit of the invention, and therefore the invention is not limited by the specific embodiments disclosed below.

The utility model provides a connecting and combining structure of a middle shaft and a chain wheel (as shown in figure 1), which comprises a middle shaft 1 and a chain wheel 2, wherein the middle shaft 1 and the chain wheel 2 are common transmission parts on an electric bicycle, so that the detailed structure of the middle shaft 1 and the chain wheel 2 is not described in detail; the middle shaft 1 comprises a middle shaft body 11, a square column body 12 is arranged at the right end of the middle shaft body 11, a limiting step 121 is formed at the joint of the square column body 12 and the middle shaft body 11, and in the actual processing and manufacturing process, in order to improve the production efficiency of the middle shaft 1 and ensure the connection strength of the square column body 12 and the middle shaft body 11, the square column body 12 and the middle shaft body 11 can be of an integrated structure; meanwhile, the lightweight of the middle shaft 1 is convenient to realize, and the middle shaft can be a hollow shaft; a square hole 21 corresponding to the square cylinder 12 is formed in the middle of the chain wheel 2, the chain wheel 2 is sleeved on the square cylinder 12 through the square hole 21, and when the square hole 21 is sleeved on the square cylinder 12, the rotation limit of the side wall of the square cylinder 12 on the side wall of the square cylinder 12 is realized through the rotation limit of the side wall of the square cylinder 12 on the side wall of the square cylinder 12, so that the rotation limit of the chain wheel 2 on the square cylinder 12 is realized; the square column 12 is provided with a locking mechanism for pressing the chain wheel 2 against the limit step 121, and after the locking mechanism presses the chain wheel 2 against the limit step 121, the axis of the chain wheel 2 on the square column 12 can move for limiting, so that the chain wheel 2 can be fixedly mounted on the square column 12.

In the above embodiment, the specific implementation of the locking mechanism is as follows: the locking mechanism comprises a square sleeve 31, a locking pin 32 and a locking nut 33, the square sleeve 31 is sleeved on the square column 12, the locking pin 32 penetrates through the square sleeve 31 and the square column 12, the locking nut 33 is screwed on the locking pin 32 to realize the fixation of the square sleeve 31 on the square column 12, the left side wall of the square sleeve 31 is pressed on the right side wall of the chain wheel 2, and the inner hole of the square sleeve 31 is square, so that the position of the through hole in the square sleeve 31 can be adjusted according to the position of the hole in the square column 12 before the square sleeve 31 is sleeved on the square column 12, and after the square sleeve 31 is sleeved on the square column 12, the correspondence of the through holes in the square sleeve 31 and the through hole in the square sleeve is realized, and then the locking pin 32 can be smoothly inserted into the square sleeve 31 and the square column 12. In order to prevent the locking pin 32 from rotating in the locking process by rotating the locking nut 33, and meanwhile, in the locking process, the square sleeve 12 is pressed, pressed and positioned on the chain wheel 2, wherein a wedge-shaped hole 311 penetrating through the upper side wall is arranged on the upper side wall of the square sleeve 31, a long and far hole 312 corresponding to the wedge-shaped hole 311 is arranged on the lower side wall of the square sleeve 31, and the long and far hole 312 penetrates through the lower side wall; the locking pin 32 comprises a wedge-shaped block 321 matched with the wedge-shaped hole 311, a threaded rod 322 is fixedly arranged at the lower part of the wedge-shaped block 321, a through hole 122 through which the threaded rod 322 penetrates is formed in the square column 12, when the square sleeve 31 is installed on the square column 12, the wedge-shaped hole 311 is opposite to the through hole 122 up and down, then the threaded rod 322 is inserted into the wedge-shaped hole 311 from the upper part, after the insertion is completed, the locking nut 33 is screwed at the lower part of the threaded rod 322, and in the screwing process, due to the pushing effect of the inclined side wall of the wedge-shaped block 321 on the side wall of the wedge-shaped hole 311, the square sleeve 31 can automatically move in the locking process and finally realize the pressing positioning of the chain wheel 2.

In order to achieve a light-weight design of the square sleeve 31, the square sleeve 31 is made of nylon. Proceeding the utility model discloses a during the equipment, put sprocket 2 cover earlier on square column body 12, then, put square sleeve 31 cover on square column body 12 and make wedge hole 311 and perforating hole 122 link up from top to bottom, then, with the corresponding square sleeve 31 and the square column body 12 of inserting of fitting pin 32 on, accomplish fitting pin 32's the back that inserts, then screw up lock nut 33 on threaded rod 322, accomplish then the utility model discloses an equipment.

In the present invention, "upper" and "lower" are relative positions used for convenience of describing the positional relationship, and therefore, cannot be interpreted as an absolute position as a limitation to the protection range.

Except for the technical features described in the specification, the method is known by the technical personnel in the field.

The above description is provided for the preferred embodiments and examples of the present invention with reference to the accompanying drawings, but the present invention is not limited to the above embodiments and examples, and it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit of the present invention, and these modifications and variations should be construed as the protection scope of the present invention.

Claims (6)

1. A middle shaft and chain wheel connecting and combining structure is characterized by comprising a middle shaft and a chain wheel, wherein the middle shaft comprises a middle shaft body, a square cylinder is arranged at the right end of the middle shaft body, a limiting step is formed at the joint of the square cylinder and the middle shaft body, a square hole corresponding to the square cylinder is formed in the middle of the chain wheel, the chain wheel is sleeved on the square cylinder through the square hole, and a locking mechanism for pressing the chain wheel on the limiting step is arranged on the square cylinder.

2. The center shaft and sprocket wheel connecting combination structure as claimed in claim 1, wherein the locking mechanism comprises a square sleeve, a locking pin and a locking nut, the square sleeve is sleeved on the square column, the locking pin penetrates through the square sleeve and the square column, the locking nut is screwed on the locking pin to fix the square sleeve on the square column, and the left side wall of the square sleeve is pressed against the right side wall of the sprocket wheel.

3. The middle shaft and chain wheel connecting combination structure as claimed in claim 2, wherein a wedge-shaped hole penetrating the upper side wall is formed on the upper side wall of the square sleeve, a long hole corresponding to the wedge-shaped hole is formed on the lower side wall of the square sleeve, and the long hole penetrates the lower side wall; the locking pin includes with wedge hole matched with wedge block the fixed threaded rod that sets up in lower part of wedge block set up one be used for on the square column body the perforating hole that the threaded rod runs through.

4. The central shaft and sprocket wheel connecting assembly as defined in claim 2, wherein said square sleeve is made of nylon material.

5. The connecting and combining structure of the middle shaft and the chain wheel as claimed in claim 1, wherein the middle shaft body and the square column body are of an integral structure.

6. The connecting and assembling structure of the middle shaft and the chain wheel as claimed in claim 1, wherein the middle shaft is a hollow tube.

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