O-shaped fast-assembly type center shaft assembly

Abstract

The utility model relates to the technical field of center shaft assemblies, in particular to an O-shaped fast-assembly type center shaft assembly which comprises a hollow pipe center shaft, a fast-assembly type shell, a bearing and an inner clamping spring. A quick-mounting shell is rotationally mounted on the hollow pipe middle shaft by using a bearing; the inner clamping spring is arranged on the outer side of one of the bearings and arranged on the hollow pipe center shaft in a sleeving mode, the structural design is simple and reasonable, high practicability is achieved, the bearings d are installed on the hollow pipe center shaft in an interference mode, the hollow pipe center shaft does not make direct friction with the ball frame when the hollow pipe center shaft is rotated, and the service life of the center shaft is prolonged; and the quick-assembly shell can be quickly inserted into the frame bottom bracket, so that the assembly work of the device can be quickly realized, the labor intensity of customer staff is reduced, and the target of reducing the cost is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of middle shaft components, in particular to an O-type quick-install middle shaft component. Background Art

[0002] The axles of electric bicycles currently used in the market are all composed of a axle, a five-piece bowl and a ball rack. The disadvantage is that the required axle, a five-piece bowl and a ball rack combination are relatively expensive; and the assembly speed of the whole vehicle is slow, which directly leads to an increase in the manufacturing cost of electric bicycle manufacturers; and there are too many overweight models of electric bicycles on the market that do not meet the weight requirements of the state, and electric bicycle manufacturers are in urgent need of weight-reducing products.

[0003] In general, the existing electric bicycle axles and sprockets use a lot of materials, have high transportation costs, and are complicated to assemble, which is a waste of limited resources for electric bicycle manufacturers, consumers, and the entire society. Utility Model Content

[0004] The purpose of the utility model is to provide an O-type quick-install middle shaft assembly to solve the defects and shortcomings of the prior art.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: it comprises a hollow tube central axis, a quick-install shell, a bearing and an inner retaining spring; the quick-install shell is rotatably mounted on the hollow tube central axis by means of the bearing; the inner retaining spring is arranged on the outside of one of the bearings and is sleeved on the hollow tube central axis.

[0006] Preferably, there are two bearings, which are respectively arranged at two ends inside the quick-install housing.

[0007] Preferably, both end caps of the central axis of the hollow tube are rectangular structures.

[0008] Preferably, a limiting protrusion is integrally formed and protrudes outwardly from the central axis of the hollow tube, and the bearing is disposed against the outer side of the limiting protrusion.

[0009] Preferably, the quick-release housing is connected to the five-way bracket of the frame by means of a hook on the outer side thereof.

[0010] Preferably, the quick-install housing is made of metal or non-metal material.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides an O-type quick-install middle shaft assembly, which has a simple and reasonable structural design and strong practicality. The bearing d is installed on the hollow tube middle shaft through interference fit, and when the hollow tube middle shaft is rotated, the hollow tube middle shaft is not directly rubbed against the ball rack, thereby extending the service life of the middle shaft; the quick-install housing can be quickly inserted into the five-way bracket of the frame, and the assembly work of the device can be quickly realized, thereby reducing the labor intensity of the customer's employees and achieving the cost reduction goal. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] Figure 2 It is an exploded view of the utility model.

[0014] Description of reference numerals:

[0015] Empty tube center axis 1, rectangular structure 1-1, limiting protrusion 1-2, quick-install housing 2, plug hook 2-1, bearing 3, inner retaining spring 4. DETAILED DESCRIPTION

[0016] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. The preferred embodiments in the description are only used as examples, and all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the utility model.

[0017] like Figure 1-Figure 2 As shown, this specific embodiment adopts the following technical scheme: it comprises a hollow tube central axis 1, a quick-install housing 2, a bearing 3 and an inner retaining ring 4; the hollow tube central axis 1 is rotatably mounted with the quick-install housing 2 by means of two bearings 3 (the outer rings of the two bearings 3 are interference-fitted at the inner ends of the quick-install housing 2, and the inner rings of the two bearings 3 are interference-fitted on the tube wall of the hollow tube central axis 1), the hollow tube central axis 1 is provided with an integrally formed limiting protrusion 1-2 protruding outward, the bearing 3 is arranged against the outer side of the limiting protrusion 1-2, and the hollow tube central axis 1 is provided with a plurality of inner retaining rings 3 and a plurality of inner retaining rings 4. The wall thickness of the shaft 1 is 1.8mm, the outer diameter of the part where the quick-mount housing 2 is installed is 15.75mm, and the bearing 3 is a low-speed bearing with an inner hole diameter of 17mm and a thickness of 5mm; the length of the quick-mount housing 2 is 80-110mm, and the wall thickness is 3mm; the two end heads of the hollow tube center shaft 1 are rectangular structures 1-1, and the internal retaining spring 4 is arranged on the outside of one of the bearings 3 and is sleeved on the hollow tube center shaft 1; the quick-mount housing 2 uses the hook 2-1 on its outside to quickly connect with the frame five-way.

[0018] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides an O-type quick-install middle shaft assembly, which has a simple and reasonable structural design and strong practicality. The bearing d is installed on the hollow tube middle shaft through interference fit, and when the hollow tube middle shaft is rotated, the hollow tube middle shaft is not directly rubbed against the ball rack, thereby extending the service life of the middle shaft; the quick-install housing can be quickly inserted into the five-way bracket of the frame, and the assembly work of the device can be quickly realized, thereby reducing the labor intensity of the customer's employees and achieving the cost reduction goal.

[0019] For those skilled in the art, they can modify the technical solutions recorded in the aforementioned embodiments and make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An O-type quick-install middle shaft assembly, characterized in that: It comprises a hollow tube central axis (1), a quick-installation outer shell (2), a bearing (3) and an inner retaining spring (4); the quick-installation outer shell (2) is rotatably mounted on the hollow tube central axis (1) by means of the bearing (3); the inner retaining spring (4) is arranged on the outer side of one of the bearings (3) and is sleeved on the hollow tube central axis (1).

2. The O-type quick-install middle shaft assembly according to claim 1, characterized in that: There are two bearings (3), which are respectively arranged at two ends inside the quick-install housing (2).

3. The O-type quick-install middle shaft assembly according to claim 2, characterized in that: The two end ends of the hollow tube central axis (1) are rectangular structures (1-1).

4. The O-type quick-install middle shaft assembly according to claim 3, characterized in that: An integrally formed limiting protrusion (1-2) protrudes outward from the central axis (1) of the hollow tube, and the bearing (3) is disposed against the outer side of the limiting protrusion (1-2).

5. The O-type quick-install middle shaft assembly according to claim 4, characterized in that: The quick-install housing (2) is connected to the five-way bracket of the frame by means of a plug hook (2-1) on the outside thereof.

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