Exercise bicycle transmission shaft mounting structure

Abstract

The utility model discloses an exercise bicycle transmission shaft installation structure which comprises a shell (1), the outer surface of the shell (1) is fixedly connected into a bicycle frame structural part, and an installation hole (2) with a circular section is formed in the shell (1). The first self-lubricating shaft sleeve (3) is arranged in the mounting hole (2) of the shell (1), and the length of the first self-lubricating shaft sleeve (3) is equal to that of the shell (1); the second self-lubricating shaft sleeve (4) is arranged in the first self-lubricating shaft sleeve (3), and the length of the second self-lubricating shaft sleeve (4) is consistent with that of the first self-lubricating shaft sleeve (3); the transmission shaft (5) is arranged in the second self-lubricating shaft sleeve (4), and pedal connecting rods (7) are arranged at the two ends of the transmission shaft (5); the gaskets (6) are sleeved at the two ends of the transmission shaft (5), and one end of each gasket (6) abuts against the first self-lubricating shaft sleeve (3), the second self-lubricating shaft sleeve (4) and the pedal connecting rod (7) at the two ends. Abnormal sound and vibration during running of the exercise bicycle can be reduced, and the service life is long.

Description

Technical Field

[0001] This utility model relates to a drive shaft mounting structure, and more particularly to a drive shaft mounting structure for the pedals of an exercise bicycle. Background Technology

[0002] Exercise bikes are a popular type of aerobic exercise equipment, offering benefits such as improved cardiovascular function, enhanced lower limb muscle strength, fat burning, stress relief, and high adaptability. The bicycle's movement is driven by the pedals, which in turn propel the driveshaft through a chain or other power transmission mechanism. During the manufacturing process of exercise bikes, the outer casing of the driveshaft is typically welded to the frame. This welding process can easily cause stress on the casing, leading to deformation. Therefore, the ends of the casing need to be ground to create circular mounting holes, and bearings are used to install the axle. However, this manufacturing method results in deformation at both ends of the casing. When installing the driveshaft and bearings, the concentricity of the two bearings may deviate to varying degrees. The driveshaft rotating on these misaligned bearings experiences eccentric torsional forces that can prematurely damage them. This poor quality results in abnormal noises and vibrations during operation, and also shortens the lifespan of the exercise bike. Utility Model Content

[0003] The purpose of this invention is to provide a driveshaft mounting structure for exercise bikes. This structure reduces damage to the exercise bike during operation and has a long service life.

[0004] The technical solution of this utility model: a drive shaft mounting structure for an exercise bicycle, comprising:

[0005] The outer shell is fixedly connected to the frame structure on its outer surface, and the inner surface of the outer shell has mounting holes with a circular cross-section.

[0006] The first self-lubricating bushing is located in the mounting hole of the housing and its length is equal to the length of the housing.

[0007] The second self-lubricating bushing is located inside the first self-lubricating bushing and has the same length as the first self-lubricating bushing.

[0008] The drive shaft is located inside the second self-lubricating bushing, and foot pedal linkages are installed at both ends of the drive shaft.

[0009] The gasket is fitted on both ends of the drive shaft, with one end abutting against the first self-lubricating bushing, the second self-lubricating bushing and the end of the housing, and the other end abutting against the foot pedal linkage. It is used to position the first self-lubricating bushing and the second self-lubricating bushing relative to the housing, the drive shaft and the foot pedal linkage. The gasket is also a bearing for end face friction.

[0010] In the aforementioned installation structure for the drive shaft of an exercise bicycle, the gasket is a self-lubricating gasket, and the outer diameter of the gasket is the same as the outer diameter of the outer shell, while the inner diameter of the gasket is larger than the outer diameter of the drive shaft.

[0011] In the aforementioned installation structure for the drive shaft of an exercise bicycle, the number of shims is greater than or equal to two sets.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] This application employs a multi-layered arrangement of a first self-lubricating bushing, a second self-lubricating bushing, and an inner and outer casing, with the drive shaft housed within the second self-lubricating bushing. This arrangement enables mutual rotation of the multiple rotating bushings: the drive shaft rotates relative to the second self-lubricating bushing, the second self-lubricating bushing rotates relative to the first self-lubricating bushing, and the first self-lubricating bushing rotates relative to the casing. This achieves two benefits during load rotation: firstly, it reduces the relative rotational speed between the two self-lubricating bushings and between the self-lubricating bushings and the casing, thus reducing drag; secondly, because the axial force is borne by the bushings, and the bushing's bearing capacity is far greater than that of a coaxial rolling bearing, the probability of impact damage is low, almost negligible. The following are some of the advantages and disadvantages of the multi-sleeve design: 1. Maintenance is required; 2. Due to the relative rotation of multiple bushings, the decrease in the relative number of rotations of each bushing results in less rolling resistance caused by speed, thus reducing the relative motion resistance; 3. The multi-layer self-lubricating bushing sliding rotation structure can eliminate eccentricity errors caused by welding deformation of the outer shell; 4. The sliding bushing structure can achieve self-lubrication, requiring no daily maintenance; 5. When the drive shaft rotates, if dust particles enter a certain rotating surface, the multi-layer bushing structure can continue to operate without being affected, utilizing another rotating surface. Furthermore, the self-lubricating bushing can squeeze the dust particles squeezed into the rotating surface into the graphite cavity of the self-lubricating bushing during operation, achieving self-repair.

[0014] The multi-layered axial end-face self-lubricating gaskets limit the positions of the outer shell, the first self-lubricating bushing, the second self-lubricating bushing, and the drive shaft, preventing axial movement of the drive shaft during operation. The principle of the multi-layered self-lubricating gaskets is the same as that of the multi-shoulder rotational friction reduction, which can reduce the end-face rotational friction resistance. At the same time, the self-lubricating gaskets of different thicknesses can adjust the rotational clearance between the pedal linkage and the end faces of the outer shell and bushings.

[0015] The multi-layer self-lubricating rotating bushing and multi-layer self-lubricating end face gasket design can withstand greater impact forces and has better axial stability, which can reduce damage to the exercise bike during operation, avoid actual daily maintenance costs, and extend its service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2This is a cross-sectional view of the present invention.

[0018] The markings in the attached diagram are: 1-outer shell, 2-mounting hole, 3-first self-lubricating bushing, 4-second self-lubricating bushing, 5-drive shaft, 6-shim, 7-foot pedal linkage. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0020] Example. A driveshaft mounting structure for an exercise bike, configured as follows: Figure 1-2 As shown, it includes:

[0021] The outer shell 1 is welded to the frame structure component on its outer surface, and the outer shell 1 has a mounting hole 2 with a circular cross-section inside;

[0022] The first self-lubricating bushing 3 is located in the mounting hole 2 of the outer casing 1, and its length is equal to the length of the outer casing 1;

[0023] The second self-lubricating bushing 4 is disposed inside the first self-lubricating bushing 3, and its length is the same as that of the first self-lubricating bushing 3.

[0024] The drive shaft 5 is located inside the second self-lubricating bushing 4, and foot pedal linkages 7 are installed at both ends of the drive shaft 5.

[0025] The gasket 6 is sleeved on both ends of the drive shaft 5, with one end abutting against the end of the first self-lubricating bushing 3, the second self-lubricating bushing 4 and the outer shell 1, and the other end abutting against the foot pedal linkage 7. It is used to position the first self-lubricating bushing 3 and the second self-lubricating bushing 4 relative to the outer shell 1, the drive shaft 5 and the foot pedal linkage 7. The gasket 6 is also a bearing for end face friction.

[0026] The gasket 6 is a self-lubricating gasket, and the outer diameter of the gasket 6 is the same as the outer diameter of the outer shell 1, while the inner diameter of the gasket 6 is larger than the outer diameter of the drive shaft 5.

[0027] The number of gaskets 6 is greater than or equal to two sets.

[0028] The principle of this utility model is as follows: First, during installation, the outer shell 1 is fixedly connected to the frame structure. The first self-lubricating bushing 3 is installed in the mounting hole 2, the second self-lubricating bushing 4 is disposed within the first self-lubricating bushing 3, and the drive shaft 5 is disposed within the second self-lubricating bushing 4, thereby allowing the drive shaft 5 to rotate relative to the outer shell 1. Because this increases resistance, conventional bicycle drive shafts are not installed in this way. However, this application is for use on exercise bikes, which do not require high resistance. Exercise bikes typically increase resistance during use to enhance the workout effect. The primary requirements for exercise bikes are low noise and good pedaling stability. This application improves reliability through the internal and external arrangement of the first self-lubricating bushing 3 and the second self-lubricating bushing 4. The shims provide end-face self-lubrication and positioning for the first self-lubricating bushing 3 and the second self-lubricating bushing 4. In conjunction with the foot pedal linkage 7, they prevent lateral displacement of the first and second self-lubricating bushings 3 and 4, thus avoiding deviations caused by the coaxiality of the two ends of the housing 1. This results in better stability of the drive shaft 5 during rotation. This application utilizes the existing threaded or pin-like connection structure between the drive shaft 5 and the foot pedal linkage 7 to position the shims, resulting in a simpler structure and lower cost.

Claims

1. A fitness bicycle transmission shaft mounting structure, characterized by, The utility model relates to a self-lubricating pedal device for vehicle, which comprises: a shell (1) fixedly connected to a vehicle frame structure on the outside, and having a mounting hole (2) with a circular cross section in the inside; a first self-lubricating bushing (3) arranged in the mounting hole (2) of the shell (1) and having a length equal to that of the shell (1); a second self-lubricating bushing (4) arranged in the first self-lubricating bushing (3) and having a length consistent with that of the first self-lubricating bushing (3); a transmission shaft (5) arranged in the second self-lubricating bushing (4), and having a foot pedal connecting rod (7) mounted at each end thereof; a gasket (6) sleeved on the transmission shaft (5) and abutting against the first self-lubricating bushing (3), the second self-lubricating bushing (4), the end of the shell (1), and the foot pedal connecting rod (7) at opposite ends thereof.

2. The fitness bicycle transmission shaft mounting structure according to claim 1, characterized in that: The gasket (6) is a self-lubricating gasket, and has an outer diameter consistent with that of the shell (1) and an inner diameter greater than that of the transmission shaft (5).

3. A fitness bicycle transmission shaft mounting structure according to claim 2, characterized in that: The number of the gaskets (6) is greater than or equal to two.

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