CN215553899U

CN215553899U - Crank assembly convenient to running-board installation

Info

Publication number: CN215553899U
Application number: CN202122038022.5U
Authority: CN
Inventors: 晁志伟
Original assignee: Beijing Youbei Baiqi Technology Co ltd
Current assignee: Beijing Youbei Baiqi Technology Co ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2022-01-18
Anticipated expiration: 2031-08-26

Abstract

The application relates to a crank assembly especially relates to a crank assembly convenient to running-board installation, and its technical scheme main points are: comprises a five-way shaft and cranks respectively arranged at two ends of the five-way shaft; the crank comprises an installation part for fixing the pedal and a connecting part inserted on the five-way shaft, rotary parts are processed at two ends of the five-way shaft, and the connecting part synchronously rotates along with the rotary parts; the mounting part is also provided with a limiting part positioned on one side of the rotating part far away from the five-way shaft, and the limiting part comprises an elastic part and a fixing part integrally formed with the mounting part; the elastic part and the fixed part are jointly provided with a limiting hole, the limiting hole is a counter bore, a blind rivet penetrates through the limiting hole, and the blind rivet is coaxially and spirally connected with the rotating part; a quick-release screw penetrates through the fixing part and the elastic part; the pedal plate mounting device achieves the purposes of facilitating the mounting of the pedal plate and overcoming the problem that the pedal plate is easy to loosen due to the error of the mounting position, and realizes the tool-free quick mounting of the pedal plate.

Description

Crank assembly convenient to running-board installation

Technical Field

The present invention relates to a crank assembly, and more particularly, to a crank assembly for facilitating installation of a pedal.

Background

Bicycles are environmentally friendly vehicles for transportation, and are more and more used and dependent by people of different ages.

In order to prevent the pedals from loosening in the use process, the bicycle with the integrated crank is generally butt-jointed and installed by using the pedals with the aligned and inverted threads; after the user receives the bicycle to be provided with the pedals, the left and right positions of the pedals need to be distinguished, and the pedals with different positive and negative threads need to be distinguished, so that the function of locking the pedals is achieved. For users who are unfamiliar with the bicycle, the acting positions of the pedals can be easily mixed and reversed, and the pedals are easy to loosen in the using process.

SUMMERY OF THE UTILITY MODEL

In order to facilitate the installation of the pedal and overcome the problem that the pedal is easy to loosen due to the error of the installation position, the application provides a crank assembly convenient for the installation of the pedal.

The application provides a crank assembly convenient to running-board installation adopts following technical scheme:

a crank assembly convenient for mounting a pedal comprises a five-way shaft and cranks respectively arranged at two ends of the five-way shaft, wherein the two cranks respectively extend towards two sides of the axis of the five-way shaft; the crank comprises a connecting part and an installation part for fixing the pedal plate, rotary parts are processed at two ends of the five-way shaft, and the connecting part is inserted on the rotary parts and synchronously rotates along with the rotary parts; the mounting part is also provided with a limiting part positioned on one side of the rotating part far away from the five-way shaft, and the limiting part comprises an elastic part and a fixing part integrally formed with the mounting part; the elastic part and the fixed part are jointly provided with a limiting hole, the limiting hole is a counter bore, a blind rivet penetrates through the limiting hole, and the blind rivet is coaxially and spirally connected with the rotating part; meanwhile, a quick-release screw which is used for pressing the elastic part to the direction close to the fixing part and fixing the elastic part and the fixing part mutually penetrates through the fixing part and the elastic part; when the fixing part and the elastic part are close to each other and fixed with each other, the diameter of the limiting hole is reduced, and the head of the blind rivet is embedded into the end with the larger diameter of the limiting hole.

By adopting the technical scheme, the pedal is pre-installed on the installation part in advance in the process of leaving a factory of the bicycle, and the five-way shaft is also pre-installed on the bicycle and can rotate around the axis of the five-way shaft; when a user needs to install the pedal on the bicycle, the connecting part is inserted on the rotating part, and the five-way shaft can rotate along with the crank; the blind rivet is positioned in one end of the limiting hole with larger diameter; screwing the quick-release screw to enable the elastic part to move in the direction close to the fixing part and fix the position relation of the elastic part and the fixing part, and meanwhile, the diameter of the limiting hole is reduced, and the head of the blind rivet is embedded into one end with the larger diameter of the limiting hole, so that the axial positioning of the limiting part along the five-way shaft is realized, and the installation of the pedal plate is completed; in the process, a user does not need to distinguish the positive and negative threads of the pedal plate, so that the condition that the left and right pedal plates are reversely installed does not exist, the installation of the pedal plates is facilitated, and the problem that the pedal plates are easy to loosen due to the error of the installation position is solved.

Optionally, the elastic part and the fixing part are integrally formed and can elastically deform in a direction close to the fixing part; one quick-release screw is arranged and is in threaded connection with the fixed part; when the elastic part is not elastically deformed, the diameter of the position with the minimum diameter of the limiting hole is larger than the diameter of the head of the blind rivet.

By adopting the technical scheme, when the crank needs to be installed on the five-way shaft, the connecting part is inserted on the rotating part, and meanwhile, when the elastic part does not elastically deform, the diameter of the minimum position of the diameter of the limiting hole is larger than the diameter of the head part of the blind rivet, so that the elastic part and the fixing part are inserted on the blind rivet through the limiting hole, and the elastic part and the fixing part are respectively positioned at two sides of the blind rivet; then twist soon quick detach screw and make the elastic component produce to the elastic deformation who is close to the fixed part direction, the diameter in spacing hole constantly reduces at this in-process, until the head embedding of blind rivet to the inside one end that spacing hole diameter is great, the head of the great one end cooperation blind rivet in diameter in spacing hole can hinder connecting portion along the axial of five-way axle breaks away from the gyration portion.

Optionally, the quick-release screw includes a screw portion and a screwing portion, the axes of the screw portion are perpendicular to each other, the screw portion penetrates through the elastic portion and is screwed with the fixing portion, and the screwing portion is located on one side, far away from the fixing portion, of the elastic portion.

Through adopting above-mentioned technical scheme, twist the screw rod portion of twisting the screw of twisting the quick detach screw of portion of twisting the setting convenience of user bare-handed to make it laborsaving more.

Optionally, a quick-release handle is arranged on the screwing part, the quick-release handle extends to one side of the screw rod part, and the radial maximum distance between the quick-release handle and the axis of the screw rod part along the screw rod part is greater than the distance between the end of the screwing part and the axis of the screw rod part.

By adopting the technical scheme, the moment of force applied to the screw by a user is further increased, so that the screw can be screwed more easily; furthermore, a tool-less mounting of the foot pedal is achieved.

Optionally, the quick-release handle includes rotating rings respectively located at two sides of the screw rod portion and respectively rotatably connected with two ends of the screwing portion, the screwing portion is eccentrically arranged inside the rotating rings, a gap exists between the rotating rings and the elastic portion, a gasket is arranged between the rotating rings and the elastic portion, and the screw rod portion penetrates through the gasket; the two rotating rings are integrally formed with a hanging part, the hanging part extends towards one side of the circle center of the rotating ring, which is far away from the axis of the screwing part, and is in a ring shape with an opening at one side, and the circle center of the hanging part is positioned at one side of the hanging part, which is close to the limiting part; the distance between the surfaces of the elastic part and the fixed part which are far away from each other is smaller than the width of the opening of the hanging part.

Through adopting above-mentioned technical scheme, after the installation of quick detach screw is accomplished, the one end that the rotating ring was kept away from to the coupling part can be constantly be close to and the overlap joint on the locating part to one side that the fixed part deviates from the elastic component, and then realizes accomodating of quick detach handle.

Optionally, the hanging part has elasticity, and the one end shaping that the rotating ring was kept away from to the hanging part has anticreep portion, and anticreep portion extends in one side that is close to the hanging part centre of a circle on the hanging part.

In the bumping process of the bicycle, the hanging part has the possibility of being separated from the limiting part, so that the use of the bicycle by a user is influenced; through adopting above-mentioned technical scheme, when the portion of colluding articulates on the locating part, make the portion of colluding take place elastic deformation so that anticreep portion crosses the global of locating part, after anticreep portion rotated to one side that the fixed part deviates from the elastic component, make the portion of colluding resume the normality, anticreep portion and then support tightly and lock on the global of locating part, reduced the possibility that portion of colluding breaks away from the locating part.

Optionally, a fastening portion capable of fastening on the circumferential surface of the limiting member is formed on one side of the hanging portion close to the center of the circle.

Through adopting above-mentioned technical scheme, realize radially spacing to hitching part, prevent that hitching part from rocking along its radially on the locating part at the in-process that the bicycle was jolted.

Optionally, one side of the elastic part, which is far away from the fixing part, is provided with a rotation-preventing groove, and one side of the gasket, which is close to the elastic part, is formed with a rotation-preventing part matched with the rotation-preventing groove.

Through adopting above-mentioned technical scheme, realize preventing promptly that the gasket from rotating around the axis of screw rod portion to the spacing of gasket.

Optionally, the connecting portion is provided with a rotation hole for inserting the rotation portion and matching with the rotation portion, and the rotation portion is of a cylindrical structure with at least one plane on the circumferential surface.

Through adopting above-mentioned technical scheme, the pore wall of gyration hole and the transmission of gyration power between the two is realized in mutually supporting of gyration portion.

Optionally, the turn portion has a taper and the cross-sectional area of the turn portion gradually decreases in a direction from the five-way shaft to the connecting portion.

Through adopting above-mentioned technical scheme, the rivet is at the inside in-process of twisting of turning portion, and the head of rivet makes locating part and connecting portion constantly compress tightly to the direction that is close to the five-way axle through spacing hole, and the pore wall in turning hole is also compressed tightly on the turning portion, and then makes can bear certain axial force and make the installation of the two more firm between turning portion and the connecting portion.

In summary, the present application has the following technical effects:

1. by arranging the five-way shaft, the mounting part, the connecting part, the rotating part, the fixing part, the elastic part, the pull nail and the quick-release screw, a user does not need to distinguish the positive and negative threads of the pedal plate in the process of mounting the pedal plate on the bicycle, so that the condition that the left and right pedal plates are reversely mounted does not exist, the pedal plate is convenient to mount, and the problem that the pedal plate is easy to loosen due to errors of the mounting position is solved;

2. through having set up quick detach handle for people can twist the quick detach screw soon by bare-handed, and then make the running-board need not install on the bicycle with the help of the instrument, made things convenient for the dismouting of user to the running-board.

Drawings

FIG. 1 is a cross-sectional view of a crank assembly according to a first embodiment;

FIG. 2 is a schematic view of the overall structure of the crank assembly according to the first embodiment;

FIG. 3 is a schematic view of an installation structure among the crank, the quick release screw and the quick release handle according to the first embodiment;

FIG. 4 is a schematic view of an installation structure of the crank, the quick release screw and the quick release handle at another view angle according to the first embodiment;

fig. 5 is a schematic view of the overall structure of the crank assembly in the second embodiment.

In the figure, 1, a five-way shaft; 11. a turning part; 2. a crank; 21. an installation part; 22. a connecting portion; 221. rotating the hole; 23. a limiting member; 231. a fixed part; 232. an elastic portion; 2321. a rotation prevention groove; 233. a limiting hole; 3. pulling nails; 4. a quick-release screw; 41. a screw section; 42. a screwing part; 5. a quick release handle; 51. a rotating ring; 52. a hanging part; 53. an anti-drop part; 54. a tightening part; 6. a gasket; 61. a rotation prevention part.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The first embodiment is as follows:

referring to fig. 1, the application provides a crank assembly convenient for pedal installation, which comprises a five-way shaft 1 installed on a bicycle and a crank 2 detachably and fixedly connected with the five-way shaft 1; the five-way shaft 1 is rotationally connected to a bicycle and can be fixed to rotate around the axis of the five-way shaft; the two cranks 2 are respectively detachably connected to two ends of the five-way shaft 1, the two cranks 2 respectively extend towards two sides of the axis of the five-way shaft 1, the extending direction of the cranks 2 is perpendicular to the axis of the five-way shaft 1, and the five-way shaft 1 can be axially fixed around the axis of the five-way shaft 1 under the action of the cranks 2; the pedals (not shown in the figure) are pre-installed on the crank 2 in advance during the bicycle leaving factory; like this, when needs install the running-board on the bicycle, can directly with the crank 2 of preinstallation running-board install on the five-way axle 1 can, and do not need the user to distinguish the positive and negative screw thread of running-board, and then just do not have the circumstances of controlling the running-board dress and turning over yet, made things convenient for the installation of running-board and overcome the running-board because the mistake of mounted position and easily taken place not hard up the problem.

Referring to fig. 1, the connection relationship between the crank 2 and the five-way shaft 1 is further configured that the crank 2 includes a mounting portion 21 for mounting the pedal and a connecting portion 22 integrally formed on the mounting portion 21, the mounting portion 21 is located at one end of the crank 2 far from the five-way shaft 1, and the mounting portion 21 is located at one end of the crank 2 near the five-way shaft 1; two ends of the five-way shaft 1 are respectively coaxially and integrally formed with a rotary part 11, and a rotary hole 221 for inserting the rotary part 11 and matching with the circumferential surface of the rotary part 11 is formed in the through connection part 22; the revolving part 11 is a cylindrical structure having at least one plane on the peripheral surface, that is, the radial cross-sectional shape of the revolving part 11 along the five-way shaft 1 may be a polygon or an incomplete circle having at least one straight line, in this embodiment, the radial cross-sectional shape of the revolving part 11 along the five-way shaft 1 is a pentagon; then, after the connecting part 22 is inserted into the rotating part 11 through the rotating hole 221, the rotating part 11 is matched with the hole wall of the rotating hole 221 to realize the transmission of the rotating power between the rotating part 11 and the connecting part 22, namely the transmission of the rotating power between the crank 2 and the five-way shaft 1.

Referring to fig. 1 and 2, the above-mentioned solution only realizes the power transmission between the crank 2 and the five-way shaft 1, but the crank 2 still has the possibility of being disengaged from the five-way shaft 1, for this reason, the crank 2 further includes a limiting member 23 disposed at one side of the connecting portion 22, the limiting member 23 is formed on the mounting portion 21, a limiting hole 233 is formed on the limiting member 23, the blind rivet 3 is inserted through the limiting hole 233 on the limiting member 23, and the blind rivet 3 simultaneously penetrates through the connecting portion 22 and the end face of the revolving portion 11 and is screwed with the revolving portion 11; specifically, the limiting hole 233 is a counter-sunk hole, and the end of the limiting hole 233 with the smaller diameter extends toward the direction close to the connecting portion 22, and the head of the blind rivet 3 can be embedded into the end of the limiting hole 233 with the larger diameter; when the crank 2 needs to be installed on the five-way shaft 1, after the connecting portion 22 is inserted into the rotating portion 11, the blind rivet 3 is screwed until the head of the blind rivet 3 abuts against the hole wall of the end with the larger diameter of the limiting hole 233, and then the fixing of the position relation between the crank 2 and the rotating portion 11, namely the five-way shaft 1, is achieved.

In order to enable the rotary part 11 and the connecting part 22 to bear certain axial force and enable the rotary part 11 and the connecting part 22 to be installed more stably, the rotary part 11 is provided with a taper and the cross-sectional area of the rotary part 11 is gradually reduced along the direction from the five-way shaft 1 to the connecting part 22; in this way, the head of the blind rivet 3 continuously presses the stopper 23 and the connecting portion 22 in the direction approaching the five-way shaft 1 through the stopper hole 233, the hole wall of the turning hole 221 is also pressed against the turning portion 11, and the insertion relationship between the connecting portion 22 and the turning portion 11 is more stable.

Further, referring to fig. 1 and 2, the limiting member 23 includes a fixing portion 231 integrally formed on the mounting portion 21, and an elastic portion 232 located at one side of the fixing portion 231 and capable of moving toward a direction close to the fixing portion 231, and the limiting holes 233 are jointly formed in the elastic portion 232 and the fixing portion 231, that is, a half of the limiting holes 233 separated along the radial direction thereof is formed in the elastic portion 232, and the other half thereof is formed in the fixing portion 231; when the elastic part 232 is not elastically deformed, the diameter of the position with the minimum diameter of the limiting hole 233 is larger than the diameter of the head of the blind rivet 3; when the elastic part 232 and the fixing part 231 are close to each other and fixed to each other, the diameter of the limiting hole 233 is reduced, and the head of the blind rivet 3 can be inserted into the end of the limiting hole 233 with the larger diameter; the fixing portion 231 and the elastic portion 232 are provided with a quick release screw 4 for pressing and fixing the elastic portion 232 in a direction approaching the fixing portion 231.

In this embodiment, referring to fig. 2 and 3, the elastic portion 232 is integrally formed on the fixing portion 231, and a connection portion between the elastic portion 232 and the fixing portion 231 has elasticity, and the elastic portion 232 can be elastically deformed in a direction approaching the fixing portion 231; the quick-release screw 4 penetrates through the elastic part 232 and is in threaded connection with the fixing part 231; further, the quick-release screw 4 comprises a screw portion 41 and a screwing portion 42, the axes of which are perpendicular to each other, the screw portion 41 penetrates through the elastic portion 232 and is arranged inside the fixing portion 231, and the screw portion 41 is in threaded connection with the fixing portion 231; the screwing part 42 is positioned on one side of the elastic part 232, which is far away from the fixing part 231, and can be abutted against the elastic part 232; in order to make the screwing of the screw portion 41 more labor-saving, the screw portion 42 extends radially to both sides of the axis of the screw portion 41.

Referring to fig. 1 again, when a user needs to mount the pedal on the bicycle, the quick release screw 4 is unscrewed to enlarge the diameter of the limiting hole 233 and enable the head of the blind rivet 3 to pass through the end of the limiting hole 233 with the smaller diameter, and in the process that the connecting portion 22 is inserted on the rotating portion 11, the limiting member 23 passes through the limiting hole 233 and is mounted on the blind rivet 3 until the blind rivet 3 is located inside the end of the limiting hole 233 with the larger diameter; then, the quick release screw 4 is screwed to make the elastic portion 232 elastically deform in a direction approaching the fixing portion 231 and fix the position relationship between the elastic portion and the fixing portion, and at the same time, the diameter of the limiting hole 233 becomes smaller and the head of the blind rivet 3 is tightly inserted into the end of the limiting hole 233 with the larger diameter, so that the limiting member 23 is axially positioned along the five-way shaft 1, and the installation of the pedal is completed.

Referring to fig. 2 and 3, in order to further facilitate and save labor to rotate the quick release screw 4 and achieve tool-less installation of the pedal, the screw portion 42 is provided with a quick release handle 5, the quick release handle 5 includes two rotating rings 51 sleeved on the screw portion 42, the two rotating rings 51 are respectively located on two sides of the axis of the screw portion 41, and a hanging portion 52 is integrally formed on the two rotating rings 51, and the hanging portion 52 extends to one side of the axis of the screw portion 41 and extends to one side of the end portion of the screw portion 42 away from the axis of the screw portion 41, that is, the maximum distance between the hanging portion 52 and the axis of the screw portion 41 along the radial direction of the screw portion 41 is greater than the distance between the end portion of the screw portion 42 and the axis of the screw portion 41.

Thus, the moment of force applied to the screw part 41 by the user is further increased, so that the screwing of the screw part 41 is further more labor-saving; in addition, the blind rivet 3 is installed on the rotary part 11 in advance when leaving the factory, when the crank 2 needs to be installed on the five-way shaft 1, the quick-release screw 4 can be screwed between the elastic part 232 and the fixing part 231 by rotating the quick-release handle 5, and compared with the prior art that the pedal is installed by tools such as an Allen wrench, the pedal installing tool-free installation and quick installation are realized.

Wherein the rotating rings 51 and the connection part of the rotating rings and the quick-release handle 5 have elasticity, and the distance between the two rotating rings 51 is larger than the length of the screwing part 42 in a normal state; when two rotating rings 51 need to be sleeved on the screwing part 42 at the same time, a force is applied to the two rotating rings 51 to enable the two rotating rings 51 to be elastically deformed in a direction away from each other so that two ends of the screwing part 42 can be placed between the two rotating rings 51, and then the two rotating rings 51 are loosened to enable the two rotating rings 51 to be sleeved on the screwing part 42 at the same time.

Further, referring to fig. 4 and 5, a gap is formed between the rotating ring 51 and the elastic portion 232 and a gasket 6 is provided, and the screw portion 41 is provided through the gasket 6; the screwing part 42 is eccentrically arranged in the rotating ring 51, the hanging part 52 extends towards the circle center of the rotating ring 51 away from one side of the axis of the screwing part 42 and is in a circular ring shape with one side opened, in the embodiment, the corresponding radian of the hanging part 52 is larger than pi, the width of the opening is larger than the distance between the surfaces, away from each other, of the elastic part 232 and the fixing part 231, and the hanging part 52 can be further lapped on the limiting part 23; in order to prevent the quick release screw 4 from loosening due to the rotation of the gasket 6 on the surface of the elastic part 232, a rotation preventing groove 2321 is formed in one side of the elastic part 232 away from the fixing part 231, a rotation preventing part 61 matched with the rotation preventing groove 2321 is formed in one side of the gasket 6 close to the elastic part 232, and the rotation preventing part 61 extends along the radial direction of the screw part 41.

After the limiting member 23 is mounted on the rivet 3 and the connecting portion 22 is inserted into the rotary portion 11, the quick release handle 5 is pulled to rotate the rotating ring 51 around the axis of the screwing portion 42, and at the same time, the hanging portion 52 also rotates around the axis of the screwing portion 42, because the screwing portion 42 is eccentrically arranged inside the rotating ring 51, the peripheral surface of the rotating ring 51 continuously moves towards the direction close to the gasket 6 in the process that the rotating ring 51 surrounds the screwing portion 42 until the peripheral surface of the rotating ring 51 abuts against the gasket 6; meanwhile, one end of the hanging part 52, which is far away from the rotating ring 51, is continuously close to one side of the fixing part 231, which is far away from the elastic part 232, around the axis of the screwing part 42 and is overlapped on the limiting part 23, so that the quick release handle 5 is accommodated.

In order to enable the hanging part 52 to be stably lapped on the limiting part 23, referring to fig. 2 and 3, an anti-disengaging part 53 is formed at one end of the hanging part 52 far away from the rotating ring 51, the anti-disengaging part 53 is positioned at one side of the hanging part 52 close to the center of a circle of the hanging part and protrudes towards the direction close to the center of the circle, the hanging part 52 has elasticity, and the width of an opening is increased when the hanging part is elastically deformed; in addition, a tight abutting part 54 which is convex towards the center of the circle is formed at one side of the hanging part 52 close to the center of the circle.

When the hanging part 52 is hung on the limiting part 23, the hanging part 52 is elastically deformed to enable the anti-disengaging part 53 to cross the peripheral surface of the limiting part 23, and when the anti-disengaging part 53 rotates to one side of the fixing part 231 departing from the elastic part 232, the hanging part 52 returns to a normal state, the anti-disengaging part 53 is further buckled on the peripheral surface of the limiting part 23, and the abutting part 54 abuts on the peripheral surface of the limiting part 23, so that the possibility that the hanging part 52 is separated from the limiting part 23 is reduced.

Example two:

referring to fig. 5, the difference between the first embodiment and the second embodiment is that the connection relationship between the elastic portion 232 and the fixing portion 231 is different, the elastic portion 232 and the fixing portion 231 are separately arranged, and two quick release screws 4 are arranged and respectively located at two sides of the limiting hole 233; after the head of the blind rivet 3 is located inside the end with the larger diameter of the limiting hole 233, the elastic part 232 moves towards the direction close to the fixing part 231 along the axial direction of the quick-release screw 4 so that the head of the blind rivet 3 is tightly embedded into the end with the larger diameter of the limiting hole 233, and finally the elastic part 232 is fixed on the fixing part 231 by screwing the two quick-release screws 4; wherein the quick-release screw 4 can be directly screwed by hand.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. A crank assembly convenient for installation of a pedal is characterized in that: the five-way shaft crank mechanism comprises a five-way shaft (1) and cranks (2) respectively arranged at two ends of the five-way shaft (1), wherein the two cranks (2) respectively extend to two sides of the axis of the five-way shaft (1); the crank (2) comprises a connecting part (22) and a mounting part (21) for fixing the pedal plate, rotary parts (11) are machined at two ends of the five-way shaft (1), the connecting part (22) is inserted in the rotary parts (11), and the connecting part and the rotary parts can synchronously rotate; the mounting part (21) is also provided with a limiting part (23) which is positioned on one side of the rotating part (11) far away from the five-way shaft (1), and the limiting part (23) comprises an elastic part (232) and a fixing part (231) which is integrally formed with the mounting part (21); the elastic part (232) and the fixing part (231) are jointly provided with a limiting hole (233), the limiting hole (233) is a counter bore, a blind rivet (3) penetrates through the limiting hole (233), and the blind rivet (3) is coaxially screwed with the rotary part (11); a quick-release screw (4) which is used for pressing the elastic part (232) to the direction close to the fixing part (231) and fixing the elastic part (232) and the fixing part (231) is arranged through the fixing part (231) and the elastic part (232);

when the fixing part (231) and the elastic part (232) are close to each other and fixed with each other, the diameter of the limiting hole (233) is reduced, and the head part of the blind rivet (3) is embedded into the end of the limiting hole (233) with the larger diameter.

2. A crank assembly for facilitating the installation of a foot pedal as claimed in claim 1, wherein: the elastic part (232) is integrally formed with the fixing part (231) and can elastically deform in the direction close to the fixing part (231); one quick-release screw (4) is arranged and is in threaded connection with the fixing part (231); when the elastic part (232) is not elastically deformed, the diameter of the position where the diameter of the limiting hole (233) is the smallest is larger than the diameter of the head of the blind rivet (3).

3. A crank assembly for facilitating the installation of a foot pedal as claimed in claim 2, wherein: the quick-release screw (4) comprises a screw rod part (41) and a screwing part (42), the axes of the screw rod part (41) are perpendicular to each other, the screw rod part (41) penetrates through the elastic part (232) and is in screwed connection with the fixing part (231), and the screwing part (42) is located on one side, far away from the fixing part (231), of the elastic part (232).

4. A crank assembly for facilitating the installation of a pedal as claimed in claim 3, wherein: the screwing part (42) is provided with a quick-release handle (5), the quick-release handle (5) extends to one side of the screw part (41), and the maximum distance between the quick-release handle (5) and the axis of the screw part (41) along the radial direction of the screw part (41) is greater than the distance between the end part of the screwing part (42) and the axis of the screw part (41).

5. A crank assembly for facilitating the installation of a foot pedal as claimed in claim 4 wherein: the quick-release handle (5) comprises rotating rings (51) which are respectively positioned on two sides of a screw rod part (41) and are respectively and rotationally connected with two ends of a screwing part (42), the screwing part (42) is eccentrically arranged in the rotating rings (51), a gap exists between the rotating rings (51) and an elastic part (232), a gasket (6) is arranged between the rotating rings and the elastic part, and the screw rod part (41) penetrates through the gasket (6); the two rotating rings (51) are integrally formed together with a hanging part (52), the hanging part (52) extends towards one side of the circle center of the rotating ring (51), which is far away from the axis of the screwing part (42), and is in a circular ring shape with an opening at one side, and the circle center of the hanging part (52) is positioned at one side, which is close to the limiting part (23), of the hanging part (52); the distance between the surfaces of the elastic part (232) and the fixing part (231) which are far away from each other is smaller than the width of the opening of the hanging part (52).

6. A crank assembly for facilitating the installation of a foot pedal as claimed in claim 5, wherein: the hanging part (52) has elasticity, one end of the hanging part (52) far away from the rotating ring (51) is formed with a retaining part (53), and the retaining part (53) extends on one side of the hanging part (52) close to the circle center of the hanging part (52).

7. A crank assembly for facilitating the installation of a foot pedal as claimed in claim 5 or 6 wherein: one side of the hanging part (52) close to the center of the circle is formed with a propping part (54) which can prop against the circumferential surface of the limiting part (23).

8. A crank assembly for facilitating the installation of a foot pedal as claimed in claim 5, wherein: the side of the elastic part (232) far away from the fixing part (231) is provided with a rotation-preventing groove (2321), and the side of the gasket (6) near the elastic part (232) is formed with a rotation-preventing part (61) matched with the rotation-preventing groove (2321).

9. A crank assembly for facilitating the installation of a foot pedal as claimed in claim 1, wherein: the connecting part (22) is provided with a rotary hole (221) for inserting the rotary part (11) and matching with the rotary part (11), and the rotary part (11) is of a cylindrical structure with at least one plane on the peripheral surface.

10. A crank assembly for facilitating the installation of a foot pedal as claimed in claim 9, wherein: the rotating part (11) has a taper and the cross-sectional area of the rotating part (11) gradually decreases in the direction from the five-way shaft (1) to the connecting part (22).