CN-116448456-B - Multi-directional bending torque endurance test system for lightweight electric bicycle cross frame

CN116448456BCN 116448456 BCN116448456 BCN 116448456BCN-116448456-B

Abstract

The invention discloses a multi-directional bending moment endurance test system of a lightweight electric bicycle cross frame, which comprises a rear cross frame fixing fixture and a multi-directional bending moment endurance test device, wherein a rear cross frame of a folding bicycle frame is fixed on the rear cross frame fixing fixture, a head pipe at the front end of a front cross frame is arranged on the multi-directional bending moment endurance test device, multi-directional bending moment and torque output by the multi-directional bending moment endurance test device are transmitted to a folding part through the head pipe and the front cross frame, and the folding part is subjected to the multi-directional bending moment and torque endurance test system without dead angles, so that the comprehensiveness of endurance test is improved.

Inventors

WANG QIN
GAO TIANTIAN
WANG SHOUMIN
ZHANG YIMING
WU SONG
WANG JIA
SU YU

Assignees

西安工业大学

Dates

Publication Date: 20260505
Application Date: 20230421

Claims (3)

1. The multi-directional bending torque endurance test system of the lightweight electric bicycle cross frame comprises a lightweight electric bicycle frame (43), wherein the lightweight electric bicycle frame comprises a folding cross frame, the folding cross frame comprises a front cross frame (3) and a rear cross frame (17), a folding part (18) between the front cross frame (3) and the rear cross frame (17) is connected through a folding structure, and the front end of the front cross frame (3) is fixedly connected with a head pipe (7); The multi-directional bending moment endurance test device is characterized by comprising a rear transverse frame fixing fixture and a multi-directional bending moment endurance test device, wherein a rear transverse frame (17) of a light-weight electric bicycle frame (43) is fixed on the rear transverse frame fixing fixture; The multi-directional bending torque endurance test device comprises a rotary driving ring (26), wherein a radial jump ring (25) is coaxially arranged on the inner side of the rotary driving ring (26), and the outer wall of the radial jump ring (25) is elastically supported and connected with the inner wall of the rotary driving ring (26) through a plurality of supporting springs (71) distributed in a circumferential array; A radial beam (10) is fixed on one side of the radial jump ring (25) along the diameter direction, a sleeve (8) coaxial with the radial jump ring (25) is fixedly connected to the middle part of the radial beam (10), a torque transmission cylinder (9) is coaxially rotated in the sleeve (8), a cylindrical synchronous cover (12) is vertically and fixedly connected to one end of the torque transmission cylinder (9), a bayonet (13) is arranged on one side of the cylindrical synchronous cover (12), the cylindrical synchronous cover (12) is coaxially centered on the outer side of the head pipe (7), and the bayonet (13) clamps the front transverse frame (3); A floating permanent magnet column (20) is arranged in the surrounding range of the radial jump ring (25) along the radial direction, a plurality of constraint rods (2) are distributed on the periphery of the floating permanent magnet column (20) in a circumferential array, the floating permanent magnet column (20) can only slide along the axial direction under the constraint of the constraint rods (2) distributed in the circumferential array, both ends of the constraint rods (2) are fixed on the inner wall of the radial jump ring (25), an a spring (1.1) and a b spring (1.2) are respectively coaxially and elastically pressed on both ends of the floating permanent magnet column (20), under the combined action of the a spring (1.1) and the b spring (1.2), the floating permanent magnet column (20) tends to the central area in the surrounding range of the radial jump ring (25), and a plurality of constraint rods (2) distributed in the circumferential array are sleeved with electromagnetic induction coils (21), and when the electromagnetic induction coils (21) are electrified, magnetic fields generated by the electromagnetic induction coils (21) can drive the floating permanent magnet column (20) to move along the axial direction; The torque transmission cylinder (9) is internally provided with a nut movable channel (15) with a regular hexagon inner contour, a limit inner edge (16) is arranged on the inner wall of one end of the nut movable channel (15) communicated with the outside, a torque transmission nut (22) with a regular hexagon outer contour is coaxially arranged in the middle of the nut movable channel (15), the torque transmission nut (22) can move along the length direction of the nut movable channel (15), an external thread torque transmission column (24) is matched with the internal thread of the torque transmission nut (22), and one end of the external thread torque transmission column (24) far away from a cylindrical synchronous cover (12) is fixed with the radial beam (10) through a fixing piece (23).
2. The multi-directional bending moment endurance test system for the lightweight electric bicycle cross frame according to claim 1, wherein an insertion column (11) is coaxially arranged on the inner side of the cylindrical synchronous cover (12), the upper end of the insertion column (11) is fixedly connected with the top wall of the cylindrical synchronous cover (12), and the insertion column (11) is downwards coaxially inserted into a head pipe channel (6) in the head pipe (7).
3. The multi-directional bending moment endurance test system for the lightweight electric bicycle cross frame according to claim 2, wherein the bottom end of the insertion column (11) is provided with a threaded hole (14), the endurance test system further comprises a locking bolt (4), and when the locking bolt (4) is locked into the threaded hole (14), a bolt head (5) of the locking bolt (4) is pressed against the lower end face of the head pipe (7).

Description

Multi-directional bending torque endurance test system for lightweight electric bicycle cross frame Technical Field The invention belongs to the field of endurance test of electric bicycles. Background In order to reduce the volume after folding as much as possible, as shown in figure 1, the frame of the electric bicycle generally comprises an independent transverse frame, wherein the folding part between the front transverse frame and the rear transverse frame of the transverse frame is connected through a folding structure, and a head pipe is independently fixed at the front end of the front transverse frame; In a specific working condition, the cross frame is subjected to bending moment that the folding part can jump up and down on a bumpy road section, bending moment that the folding part can be subjected to bending moment and jumping bending moment in a non-up-down direction when the folding part obliquely runs on a ramp and turns, and the moment condition of the folding part is complex because the lightweight foldable electric vehicle needs to be frequently transported to a trunk and the like; Compared with a non-folding vehicle, the folding part of the lightweight electric bicycle is the weakest part, and the situation that the folding part is loose and scattered due to bending moment and torque in any direction can be caused, so that a durability test system capable of enabling the folding part to be subjected to bending moment and torque in multiple directions without dead angles is required to be designed, and the comprehensiveness of the durability test is improved. Disclosure of Invention The invention aims to overcome the defects in the prior art, and provides a multi-directional bending torque endurance test system for a lightweight electric bicycle cross frame, which enables a folded part to be subjected to bending moments and torques in multiple directions without dead angles and improves the comprehensiveness of endurance test. In order to achieve the above purpose, the multi-directional bending torque endurance test system of the lightweight electric bicycle cross frame comprises a folding cross frame, wherein the folding cross frame comprises a front cross frame and a rear cross frame, and folding parts between the front cross frame and the rear cross frame are connected through a folding structure; The multi-directional bending moment endurance testing device comprises a rear transverse frame fixing fixture and a multi-directional bending moment endurance testing device, wherein a rear transverse frame of a lightweight electric bicycle frame is fixed on the rear transverse frame fixing fixture, a head pipe at the front end of a front transverse frame is arranged on the multi-directional bending moment endurance testing device, and multi-directional bending moment and torque output by the multi-directional bending moment endurance testing device are transmitted to a folding part through the head pipe and the front transverse frame. Further, the multi-directional bending torque endurance test device comprises an output shaft driven by a motor, and further comprises a rotary driving ring coaxial with the output shaft, wherein the outer wall of the rotary driving ring is synchronously connected with the output shaft through a plurality of synchronous arms, the inner side of the rotary driving ring is coaxially provided with a radial jump ring, and the outer wall of the radial jump ring is elastically supported and connected with the inner wall of the rotary driving ring through a plurality of supporting springs distributed in a circumferential array. Further, one side of the radial jump ring is fixedly connected with a radial beam along the diameter direction, the middle part of the radial beam is fixedly connected with a sleeve coaxial with the radial jump ring, a torque transmission cylinder is arranged in the sleeve in a coaxial mode through a plurality of bearings, one end of the torque transmission cylinder is vertically and fixedly connected with a cylindrical synchronous cover, one side of the cylindrical synchronous cover is provided with a bayonet, the cylindrical synchronous cover is coaxially centered on the outer side of the head pipe, and the bayonet clamps the front transverse frame. Further, an inserting column is coaxially arranged on the inner side of the cylindrical synchronous cover, the upper end of the inserting column is fixedly connected with the top wall of the cylindrical synchronous cover, and the inserting column is downwards coaxially inserted into a head pipe channel in the head pipe. Further, the bottom end of the insertion column is provided with a threaded hole, and the lower end face of the pressure head pipe is propped by the bolt head of the locking bolt when the locking bolt is locked into the threaded hole. Further, floating permanent magnet columns are arranged in the radial direction within the enclosing range of the radial jump ring, a plurality of con