Combined frame

Abstract

A combined frame comprises a front triangular device and a rear triangular device combined with the front triangular device, and the front triangular device comprises a head pipe assembly, a lower pipe assembly, an upper pipe assembly and a middle pipe assembly; one end of the lower pipe assembly is screwed and locked on the head pipe assembly, and the other end of the lower pipe assembly is screwed and locked on the middle pipe assembly; one end of the upper pipe assembly is overlapped with one end of the lower pipe assembly and is screwed and locked on the head pipe assembly, and the other end of the upper pipe assembly is screwed and locked on the middle pipe assembly; the angle of the front triangular device is positioned in the mode that the upper pipe assembly and the lower pipe assembly are locked to the head pipe assembly in an overlapped and screwed mode, by changing the length size of the upper pipe assembly and the lower pipe assembly of the front triangular device, various combined frames with the front triangular devices of different sizes can be assembled and combined, and the combined frames are used for various types of bicycles.

Description

Technical Field

[0001] The present invention relates to a vehicle frame assembled from parts, and in particular to a combined vehicle frame. Background Art

[0002] Existing bicycle frames, whether for bicycles or electric bikes, primarily use welded tubes to form the front and rear triangles. The front triangle includes a head tube, a center tube, and top and down tubes connected between the head tube and center tube. The rear triangle includes a chain stay and seat stays connected to the center tube. The front and rear triangles are welded together to form a single-piece frame.

[0003] Because existing bicycle frames are manufactured by welding rather than assembly, the size of the frame cannot be changed. The size of the front triangle cannot be changed by replacing the top tube and down tube assembled between the head tube and the center tube, nor can the size of the rear triangle be changed by replacing the chain stay and seat stay assembled to the center tube. In addition, welding equipment is required during the frame manufacturing process, and the components are not removable and replaceable. Frame components cannot be replaced like changing clothes. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a modular frame. By assembling a combined front triangle device or a combined rear triangle device, welding is not required during the manufacturing process of the bicycle frame. By adjusting and changing some components of the front triangle device or the rear triangle device, a plurality of modular frames with front triangle devices or rear triangle devices of different sizes can be combined, which can be used for a variety of bicycle models.

[0005] In order to achieve the above-mentioned object, the present invention provides a modular bicycle frame, comprising a front triangle assembly and a rear triangle assembly coupled to the front triangle assembly, wherein: the front triangle assembly comprises a head tube assembly, a lower tube assembly, a top tube assembly, and a middle tube assembly; one end of the lower tube assembly is screwed to the head tube assembly, and the other end of the lower tube assembly is screwed to the middle tube assembly; one end of the top tube assembly overlaps with one end of the lower tube assembly and is screwed to the head tube assembly, and the other end of the top tube assembly is screwed to the middle tube assembly; and the rear triangle assembly is coupled to the middle tube assembly of the front triangle assembly.

[0006] In order to achieve the above-mentioned object, the present invention also provides a combined bicycle frame, comprising a front triangle device and a rear triangle device combined with the front triangle device, wherein: the front triangle device comprises a head tube, a middle tube assembly, a lower tube and a top tube respectively connected between the head tube and the middle tube assembly; the middle tube assembly comprises a middle tube body and a drive assembly seat connected to the middle tube body, the drive assembly seat can be a frame for providing a mid-mounted motor for the bicycle to be installed, or can be a bottom bracket tube for providing a bottom bracket for the bicycle to be installed; the drive assembly seat has a rear chain stay assembly pivot seat on a side facing away from the lower tube, the rear chain stay assembly pivot seat has a rear chain stay axis hole, and a rear chain stay axis is passed through the rear chain stay axis hole; the middle tube body has a swing rod seat on a side facing the lower tube, the swing rod seat has a swing rod axis hole, and a swing rod axis is passed through the swing rod axis hole; the top tube or the down tube has a shock absorber front pivot seat. The rear triangle device includes a chain stay assembly, a seat stay assembly and a swing link; one end of the chain stay assembly is coupled to the chain stay shaft, one end of the seat stay assembly has a shock absorber rear pivot seat, and the other end of the seat stay assembly is pivotally connected to the other end of the chain stay assembly; one end of the swing link is pivotally connected to the shock absorber rear pivot seat, and the other end of the swing link is coupled to the swing link shaft.

[0007] The present invention provides the advantage of positioning the angle of the front triangle by interlocking the upper and lower tube assemblies and screwing them to the head tube assembly. By varying the lengths of the upper and lower tube assemblies, a variety of modular frames with different front triangle sizes can be assembled, suitable for a variety of bicycle or electric bicycle models. The chainstay assembly, seatstay assembly, and swing arm form a movable rear triangle. Regardless of whether the front or rear triangle is assembled as described above, welding is not required during manufacture. The detachable components allow for modularization, allowing components to be replaced like changing clothes. This allows not only the size of the front or rear triangle to be changed, but also its appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A perspective view of a first preferred embodiment of the present invention;

[0009] Figure 2 A perspective view of a front triangle device according to a first preferred embodiment of the present invention;

[0010] Figure 3 for Figure 2 Exploded view of the front triangle;

[0011] Figure 4 for Figure 2 An exploded view of the front triangle device from another angle;

[0012] Figure 5 It is a partially enlarged schematic diagram of the head tube mount having the plug portion according to the first preferred embodiment of the present invention;

[0013] Figure 6 A side view of a first preferred embodiment of the present invention;

[0014] Figure 7 for Figure 6 Cross-sectional view in the direction of 7-7;

[0015] Figure 8 This is an exploded view of the chain stay assembly according to the first preferred embodiment of the present invention;

[0016] Figure 9 for Figure 6 9-9 direction cross-sectional view;

[0017] Figure 10 An exploded view of the seat stay assembly and the swing arm of the first preferred embodiment of the present invention;

[0018] Figure 11 for Figure 6 11-11 direction cross-sectional view;

[0019] Figure 12 for Figure 6 Exploded view of the chainstay and seatstay assemblies;

[0020] Figure 13 A perspective view of a second preferred embodiment of the present invention;

[0021] Figure 14 A side view of a front triangle device according to a second preferred embodiment of the present invention;

[0022] Figure 15 for Figure 13 Exploded view of the front triangle;

[0023] Figure 16 for Figure 13 An exploded view of the front triangle device from another angle;

[0024] Figure 17 A perspective view of a third preferred embodiment of the present invention;

[0025] Figure 18 A side view of a third preferred embodiment of the present invention;

[0026] Figure 19 FIG. 1 is a side view of a front triangle device according to a third preferred embodiment of the present invention.

[0027]

Explanation of symbols

[0028] 1: Modular frame

[0029] 1A: Modular frame

[0030] 1B: Modular frame

[0031] 100:Front triangle device

[0032] 100A: front triangle device

[0033] 100B: front triangle device

[0034] 10: Head pipe assembly

[0035] 10A: Head pipe assembly

[0036] 10B: head tube

[0037] 12: Head tube body

[0038] 12A: Head tube body

[0039] 14: Head tube seat

[0040] 14A: Head tube seat

[0041] 141:Head tube side panel

[0042] 141A: Head tube side panel

[0043] 142: Upper concave part

[0044] 142A: Upper concave part

[0045] 1421A: Deep segment

[0046] 1422A: shallow section

[0047] 143: Upper concave screw hole

[0048] 143A: Upper concave screw hole

[0049] 144: Bolt hole

[0050] 145: Bolt fixing screw hole

[0051] 16: Plug

[0052] 16A: Plug

[0053] 161: bolt annular groove

[0054] 18: Bolt fixing bolt

[0055] 20: Down tube assembly

[0056] 20A: Down tube assembly

[0057] 20B: Down tube

[0058] 22: Down tube body

[0059] 22A: Down tube body

[0060] 24: Down tube top plate

[0061] 24A: Down tube top plate

[0062] 241: Down tube top plate perforation

[0063] 241A: Down tube top plate perforation

[0064] 242: Down tube top plate socket

[0065] 242A: Down tube top plate socket

[0066] 25: First bolt

[0067] 25A: First bolt

[0068] 26: Down tube base plate

[0069] 26A: Down tube base plate

[0070] 261: Down tube bottom plate perforation

[0071] 261A: Down tube bottom plate perforation

[0072] 262: Down tube bottom plate socket

[0073] 262A: Down tube base plate socket

[0074] 27: Second bolt

[0075] 27A: Second bolt

[0076] 28: Shock absorber front pivot seat

[0077] 28A: Shock absorber front pivot seat

[0078] 28B: Shock absorber front pivot seat

[0079] 281: Front pivot lug

[0080] 281A: Front pivot lug

[0081] 282: Front pivot seat perforation

[0082] 282A: Front pivot seat through hole

[0083] 29: Insert rod

[0084] 291:Fixed disk

[0085] 30: Upper tube assembly

[0086] 30A: Upper tube assembly

[0087] 30B: Top tube

[0088] 32: Top tube body

[0089] 32A: Top tube body

[0090] 321: Middle pipe connector

[0091] 321A: Middle pipe connector

[0092] 34: Upper tube front plate

[0093] 34A: Upper tube front plate

[0094] 341: Top tube front plate perforation

[0095] 341A: Top tube front plate perforation

[0096] 342: Upper tube front plate jack

[0097] 342A: Upper tube front plate jack

[0098] 36: Upper tube rear plate

[0099] 361: Upper tube rear plate perforation

[0100] 37: Tailstock fixing parts

[0101] 371: Tailstock fixing screw hole

[0102] 372: Tailstock fixing bolt

[0103] 38:Rear fender bracket

[0104] 381: Screw lock seat

[0105] 382: Recessed part of screw lock seat

[0106] 383:Rear fender

[0107] 40: Middle pipe assembly

[0108] 40A: Middle pipe assembly

[0109] 40B: Middle pipe assembly

[0110] 42: Middle tube body

[0111] 42A: Middle tube body

[0112] 42B: Middle tube body

[0113] 421: Upper tube connector

[0114] 421A: Upper tube connector

[0115] 422: Tailstock

[0116] 423: Tailstock recess

[0117] 44: Drive assembly seat

[0118] 44A: Drive assembly seat

[0119] 44B: Drive assembly seat

[0120] 441: Base

[0121] 441A: Base

[0122] 442: Base side panel

[0123] 442A: Base side panel

[0124] 443: concave part

[0125] 443A: concave part

[0126] 444: Lower recessed screw hole

[0127] 444A: Lower recessed screw hole

[0128] 445: Rod hole

[0129] 445A: Rod hole

[0130] 446: rear chainstay assembly pivot seat

[0131] 446A: Chainstay assembly pivot seat

[0132] 446B: Chainstay assembly pivot seat

[0133] 447: rear chainstay axle hole

[0134] 447B: rear chainstay axle hole

[0135] 46: Swing rod seat

[0136] 46A: Swing rod seat

[0137] 46B: Swing rod seat

[0138] 461: Swing rod shaft hole

[0139] 461B: Swing lever shaft hole

[0140] 200: Rear triangle device

[0141] 200A: Rear triangle device

[0142] 200B: Rear triangle device

[0143] 50:Chain fork assembly

[0144] 50A: Chainstay assembly

[0145] 50B: Chainstay assembly

[0146] 52: chainstay sidebar

[0147] 521: Rear shaft hole

[0148] 54: Front plate of chainstay

[0149] 541: Connecting groove

[0150] 542: Front plate perforation of chainstay

[0151] 543: Rear lower fork shaft fixing screw hole

[0152] 56: Connecting blocks

[0153] 561: Connecting bump

[0154] 58: rear chainstay axle

[0155] 58B: rear chainstay axle

[0156] 581: Rear lower fork shaft annular groove

[0157] 59: Rear lower fork shaft fixing bolt

[0158] 60: Seat fork assembly

[0159] 60A: Seat stay assembly

[0160] 60B: Seatstay assembly

[0161] 62: Seat fork side rod

[0162] 64: Front plate of seat stay

[0163] 641: Front plate perforation of the rear seat stay

[0164] 642: rear seat fork front plate axle hole

[0165] 643: Pivot shaft fixing screw hole

[0166] 644: Rear pivot screw hole

[0167] 645: Rear pivot countersunk hole

[0168] 65: Rear pivot bolt

[0169] 66: Rear wheel axle seat

[0170] 661: Rear wheel axle hole

[0171] 662: Rear wheel axle seat lug

[0172] 663: Rear wheel axle seat lug perforation

[0173] 664: Rear shaft fixing screw hole

[0174] 67: Rear shaft

[0175] 671: Rear shaft annular groove

[0176] 68: Shock absorber rear pivot seat

[0177] 68A: Shock absorber rear pivot seat

[0178] 68B: Shock absorber rear pivot seat

[0179] 681: Rear pivot seat side bar

[0180] 682: Connecting rod

[0181] 683: Rear pivot seat side rod screw hole

[0182] 684: Rear pivot seat side rod shaft hole

[0183] 685: Rear pivot hole

[0184] 69: Rear shaft fixing bolt

[0185] 70: Swinging rod

[0186] 70A: Swing rod

[0187] 70B: Swing rod

[0188] 71: Pivot shaft fixing bolt

[0189] 72: Top arm

[0190] 721: Top arm shaft hole

[0191] 73: Pivot shaft

[0192] 731: Pivot shaft annular groove

[0193] 74: Bottom arm

[0194] 741: Bottom arm perforation

[0195] 742:Swing lever shaft fixing screw hole

[0196] 75: Swing lever shaft

[0197] 75B: Swing lever shaft

[0198] 751:Swing lever shaft annular groove

[0199] 76:Swing arm shaft fixing bolt DETAILED DESCRIPTION

[0200] In order to explain the present invention more clearly, a preferred embodiment is given below and described in detail with reference to the accompanying drawings. Figures 1 to 5 FIG. 1 shows a modular frame 1 according to a first preferred embodiment of the present invention. The modular frame 1 is defined as having three-dimensional directions: front-back, left-right, and top-bottom. The modular frame 1 includes a front triangle assembly 100 and a rear triangle assembly 200 coupled to the front triangle assembly 100.

[0201] The front triangle assembly 100 includes a head tube assembly 10, a lower tube assembly 20, a top tube assembly 30, and a center tube assembly 40. The head tube assembly 10 includes a head tube body 12 and a head tube mount 14 connected to the head tube body 12. The head tube body 12 is a vertically arranged circular tube. The head tube mount 14 has two head tube side plates 141 on opposite left and right sides. The head tube body 12 is connected between the front sides of the two head tube side plates 141. Each head tube side plate 141 has an upper recess 142 on its outer side. Each upper recess 142 has two upper recess screw holes 143 and a bolt hole 144. Each bolt hole 144 extends through each upper recess 142. Each head tube side plate 141 has a bolt fixing screw hole 145 at its top. Each bolt fixing screw hole 145 is tangential to the rear side of the bolt hole 144.

[0202] The downtube assembly 20 comprises a downtube body 22. In the preferred embodiment, the downtube body 22 is an obliquely arranged, elongated sheet metal member. The top and left sides of each downtube body 22 are connected to two downtube top plates 24, each having two downtube top plate through-holes 241 and a downtube top plate insertion hole 242. The bottom and left sides of each downtube body 22 are connected to two downtube bottom plates 26, each having a downtube bottom plate through-hole 261 and a downtube bottom plate insertion hole 262. A shock absorber front pivot seat 28 is disposed on the downtube body 22, facing the rear side of the midtube assembly 40. The shock absorber front pivot seat 28 comprises a pair of front pivot seat lugs 281, each of which has a front pivot seat through-hole 282.

[0203] The top end of the down tube assembly 20 is screwed to the head tube assembly 10 . Specifically, when the top end of the down tube assembly 20 is screwed to the head tube assembly 10 , each down tube top plate 24 is embedded in each upper recess 142 of the head tube mount 14 , each down tube top plate through-hole 241 is aligned with each upper recess screw hole 143 , and each down tube top plate insertion hole 242 is aligned with each bolt hole 144 .

[0204] The upper tube assembly 30 comprises an upper tube body 32. In this preferred embodiment, the upper tube body 32 is a straight tube extending in the front-to-back direction. The front and left sides of the upper tube body 32 are connected to two upper tube front plates 34. Each upper tube front plate 34 has two upper tube front plate through-holes 341 and a upper tube front plate insertion hole 342. The rear end of the upper tube body 32 comprises a middle tube connector 321. The middle tube connector 321 connects to two upper tube rear plates 36 on opposite sides. The two upper tube rear plates 36 extend rearwardly away from the upper tube body 32. Each rear end of the upper tube rear plates 36 has an upper tube rear plate through-hole 361. In other preferred embodiments, the aforementioned shock absorber front pivot seat 28 may also be formed on the bottom side of the upper tube body 32.

[0205] The front end of the upper tube assembly 30 overlaps with the top end of the down tube assembly 20 and is screwed to the head tube assembly 10. Specifically, when the front end of the upper tube assembly 30 is screwed to the head tube assembly 10, each upper tube front plate 34 overlaps with each down tube top plate 24 of the down tube assembly 20, and each upper tube front plate through-hole 341 aligns with each down tube top plate through-hole 241, while each upper tube front plate insertion hole 342 aligns with each down tube top plate insertion hole 242. A first bolt 25 is inserted through each upper tube front plate through-hole 341 and each down tube top plate through-hole 241, and each first bolt 25 is screwed into each upper recessed screw hole 143, thereby screwing the top end of the down tube assembly 20 and the front end of the upper tube assembly 30 to the head tube assembly 10.

[0206] A plug 16 is inserted through each of the upper tube front plate insertion holes 342 and each of the lower tube top plate insertion holes 242. One end of each of the plugs 16 is inserted into each of the plug holes 144 and is surrounded by a plug annular groove 161. The other end of each of the plugs 16 protrudes from each of the upper recesses 142, so that each of the lower tube top plate insertion holes 242 and each of the upper tube front plate insertion holes 342 are respectively fitted around the periphery of each of the plugs 16. A bolt fixing bolt 18 is screwed into each of the bolt fixing screw holes 145 , with a portion of each bolt fixing bolt 18 passing through the rear side of the bolt annular groove 161 of each bolt 16 , thereby fixing each bolt 16 in each of the bolt holes 144 , so that each bolt 16 is connected to each of the upper recesses 142 . This allows the lower tube top plates 24 and upper tube front plates 34 , which overlap and are screwed into each of the upper recesses 142 , to be more securely coupled to each of the upper recesses 142 of the head tube assembly 10 by means of each bolt 16 passing through each of the lower tube top plate insertion holes 242 and each of the upper tube front plate insertion holes 342 . As a result, the lower tube assembly 20 and the upper tube assembly 30 are more securely assembled to the head tube assembly 10 through the dual coupling means of screwing and bolting.

[0207] The mid-tube assembly 40 includes a mid-tube body 42 and a drive assembly base 44. The mid-tube body 42 is a vertically arranged tube. The drive assembly base 44 is a frame that provides a mounting for the bicycle's mid-mounted motor and is connected to the bottom end of the mid-tube body 42. In other preferred embodiments, the drive assembly base 44 can also be a bottom bracket assembly that provides a mounting for the bicycle's bottom bracket. The drive assembly base 44 has a base 441 facing the front of the down-tube assembly. The base 441 has two base side panels 442 on opposite sides. Each base side panel 442 has a lower recess 443 on its outer side. Each lower recess 443 has a lower recess screw hole 444 and a rod insertion hole 445. The drive assembly base 44 has a chain stay assembly pivot seat 446 on the rear side, facing away from the down-tube assembly 20. The chain stay assembly pivot seat 446 has a chain stay axle hole 447.

[0208] The bottom end of the lower tube assembly 20 is screwed to the middle tube assembly 40; specifically, when the bottom end of the lower tube assembly 20 is screwed to the middle tube assembly 40, each lower tube base plate 26 is embedded in each lower recess 443 of the base 441. At this time, each lower tube base plate through-hole 261 is opposite to each lower recess screw hole 444, and each lower tube base plate insertion hole 262 is opposite to each rod insertion hole 445. A second bolt 27 is passed through each of the lower tube bottom plate through-holes 261, and each of the second bolts 27 is screwed into each of the lower recessed screw holes 444; an insertion rod 29 is passed through each of the lower tube bottom plate insertion holes 262, and one end of each of the insertion rods 29 is inserted into each of the insertion rod holes 445, and the other end of each of the insertion rods 29 is combined with a fixing plate 291, and each of the fixing plates 291 is screwed and fixed to each of the lower tube bottom plates 26; thereby, the bottom end of the lower tube assembly 20 is screwed and fixed to the drive assembly seat 44 of the middle tube assembly 40.

[0209] The top of the middle tube body 42, facing the front of the head tube assembly 10, has a top tube engagement seat 421. The top of the middle tube body 42, facing the rear of the head tube assembly 10, has a tail seat 422. A tail seat recess 423 is defined in the center of the rear of the tail seat 422. A swing rod seat 46 is defined in the center of the middle tube body 42, facing the down tube assembly 20. In this preferred embodiment, the swing rod seat 46 is connected between the middle tube body 42 and the drive assembly seat 44. The swing rod seat 46 defines a swing rod shaft hole 461.

[0210] The rear end of the upper tube assembly 30 is screwed to the middle tube assembly 40; specifically, when the rear end of the upper tube assembly 30 is screwed to the middle tube assembly 40, the middle tube connector 321 leans rearward against the upper tube connector 421, and the middle tube connector 321 is screwed together with the upper tube connector 421 of the middle tube body 42. The two upper tube rear plates 36 pass through the left and right sides of the middle tube body 42, and a tailstock fixing piece 37 is detachably combined between the rear ends of the two upper tube rear plates 36. The tailstock fixing piece 37 is a column and the front side of the circumference is embedded in the tailstock recess 423 of the tailstock 422. The left and right ends of the tailstock fixing piece 37 in opposite directions have two tailstock fixing piece screw holes 371. A tailstock fixing piece bolt 372 is passed through each of the upper tube rear plate through-holes 361. Each of the tailstock fixing piece bolts 372 is screwed into each of the tailstock fixing piece screw holes 371 and fixed. The left and right ends of the tailstock fixing piece 37 in opposite directions are screwed to the two upper tube rear plates 36.

[0211] A rear fender bracket 38 is provided in conjunction with the tail stock 422. The front end of the rear fender bracket 38 has a screw seat 381, and the screw seat 381 is screwed together with the rear end of the tail stock 422. A screw seat recess 382 is provided in the middle of the front of the screw seat 381. The screw seat recess 382 and the tail stock recess 423 are surrounded by the tail stock fixing part 37. The rear end of the rear fender bracket 38 is connected to a rear fender 383.

[0212] Please see Figures 6 to 8 As shown, the rear triangle assembly 200 includes a chain stay assembly 50, a seat stay assembly 60, and a swing arm 70. The chain stay assembly 50 includes two chain stay side bars 52, which are spaced apart and arranged side by side. The front end of each chain stay side bar 52 is connected to a chain stay front plate 54, and the rear end of each chain stay side bar 52 has a rear pivot hole 521. The inner side of each chain stay front plate 54 has a non-circular connecting groove 541; in the preferred embodiment, each connecting groove 541 is a linear groove. A connecting block 56 is screwed together between the two rear chain fork front plates 54, and two connecting protrusions 561 are provided on the left and right sides in opposite directions of the connecting block 56. The shape of each connecting protrusion 561 is consistent with the shape of each connecting embedding groove 541, and each connecting protrusion 561 is embedded in each connecting embedding groove 541; the top of the front end of each rear chain fork front plate 54 is provided with a rear chain fork front plate through hole 542, and the top surface of each rear chain fork front plate 54 is also provided with a rear chain fork shaft fixing screw hole 543, and each rear chain fork shaft fixing screw hole 543 is tangent to the rear side around each rear chain fork front plate through hole 542.

[0213] Please see Figure 2 and Figures 6 to 8As shown, the front end of the chain stay assembly 50 is pivotally connected to the chain stay assembly pivot seat 446 of the center tube assembly 40. Specifically, the two chain stay front plate through-holes 542 of the chain stay assembly 50 are aligned with the chain stay axle hole 447 of the center tube assembly 40. A chain stay axle 58 is inserted through the chain stay axle hole 447 of the front triangle device 100. Each end of the chain stay axle 58 is surrounded by a chain stay axle annular groove 581. The two chain stay front plate through-holes 542 of the chain stay assembly 50 fit over the ends of the chain stay axle 58. A chain stay axle fixing bolt 59 is screwed into each chain stay axle fixing screw hole 543. A portion of each chain stay axle fixing bolt 59 extends through the rear side of each chain stay axle annular groove 581, thereby securing the chain stay axle 58 between the two chain stay front plate through-holes 542.

[0214] Please see Figure 6 and Figures 9 to 12 As shown, the seat stay assembly 60 includes two seat stay side rods 62, which are spaced apart and arranged side by side. The front and rear ends of each seat stay side rod 62 are respectively connected to a seat stay front plate 64 and a rear wheel axle seat 66. Each seat stay front plate 64 is an elongated plate, and has a seat stay front plate through-hole 641 and a seat stay front plate axle hole 642 on the rear side and the middle of each seat stay front plate 64, respectively. The top surface of each seat stay front plate 64 has a pivot shaft fixing screw hole 643, and each pivot shaft fixing screw hole 643 is tangential to the front side around each seat stay front plate axle hole 642. The front end of one of the two seat stay front plates 64 has a rear pivot screw hole 644, and the front end of the other seat stay front plate 64 has a rear pivot countersunk hole 645. The two rear wheel axle seats 66 respectively have a rear wheel axle hole 661, and the bottom side of each rear wheel axle seat 66 has a pair of rear wheel axle seat lugs 662, and the pair of rear wheel axle seat lugs 662 have a rear wheel axle seat lug through-hole 663. The circumference of one of the pairs of rear wheel axle seat lugs 662 has a rear shaft fixing screw hole 664, and each rear shaft fixing screw hole 664 is tangent to the top side around each rear wheel axle seat lug through-hole 663.

[0215] A shock absorber rear pivot seat 68 is screwed between the two seat stay front plates 64. The shock absorber rear pivot seat 68 includes two rear pivot seat side bars 681 and a connecting rod 682. Each rear pivot seat side bar 681 is a long, rectangular plate, and the connecting rod 682 connects between the bottom sides of the front ends of the two rear pivot seat side bars 681. Each rear pivot seat side bar 681 rests against the inner side of each seat stay front plate 64, and each rear pivot seat side bar 681 has a rear pivot seat side bar screw hole 683 and a rear pivot seat side bar shaft hole 684 on its rear side and center, respectively. Each rear pivot side rod screw hole 683 is aligned with each seat fork front plate through-hole 641, and each rear pivot side rod axle hole 684 is aligned with each seat fork front plate axle hole 642. A rear pivot bolt 65 is passed through each seat fork front plate through-hole 641, and each rear pivot bolt 65 is screwed into each rear pivot side rod screw hole 683. Each rear pivot side rod 681 has a rear pivot through-hole 685 at its front end, and the two rear pivot through-holes 685 are aligned with the rear pivot screw hole 644 and the rear pivot countersunk hole 645.

[0216] The rear end of the seat stay assembly 60 is pivotally connected to the rear end of the chain stay assembly 50. Specifically, the rear end of each chain stay sidebar 52 is inserted into a pair of rear wheel axle seat lugs 662, with the rear axle hole 521 facing each rear wheel axle seat lug through-hole 663. A rear axle 67 is fixedly mounted in each rear wheel axle seat lug through-hole 663. Each rear axle 67 pivots through each rear axle hole 521 and has a rear axle annular groove 671 around its periphery. A rear axle fixing bolt 69 is screwed into each rear axle fixing screw hole 664. A portion of each rear axle fixing bolt 69 extends through the top side of each rear axle annular groove 671, thereby securing each rear axle 67 to each rear wheel axle seat lug through-hole 663.

[0217] Please see Figure 6 、 Figure 7 and Figure 10 As shown, the top side of the swing rod 70 facing the rear pivot seat 68 of the shock absorber has two top arms 72 arranged in parallel on the left and right, and the top ends of the two top arms 72 respectively have a top arm shaft hole 721; the bottom side of the swing rod 70 away from the rear pivot seat 68 of the shock absorber has two bottom arms 74 arranged in parallel on the left and right, and the bottom ends of the two bottom arms 74 respectively have a bottom arm through-hole 741; the front side of each bottom arm 74 has a swing rod shaft fixing screw hole 742, and each swing rod shaft fixing screw hole 742 is tangent to the top side around each bottom arm through-hole 741.

[0218] The front end of the seat stay assembly 60 includes the shock absorber rear pivot seat 68, to which the top end of the swing arm 70 is pivotally connected. Specifically, two top arms 72 extend between the two seat stay front plates 64, with the two top arm shaft holes 721 aligned with the two seat stay front plate shaft holes 642. A pivot shaft 73 is fixedly positioned through each of the seat stay front plate shaft holes 642, each of the rear pivot seat side rod shaft holes 684, and each of the top arm shaft holes 721. Each of the pivot shafts 73 has a pivot shaft annular groove 731 formed around it. A pivot shaft fixing bolt 71 is screwed into each of the pivot shaft fixing screw holes 643. Portions of each pivot shaft fixing bolt 71 extend forward of each of the pivot shaft annular grooves 731, thereby securing the pivot shaft 73 to each of the seat stay front plate shaft holes 642.

[0219] The bottom end of the swing link 70 is pivotally connected to the swing link base 46 of the middle tube assembly 40. Specifically, the two bottom arm through-holes 741 are aligned with the swing link shaft hole 461 of the middle tube assembly 40. A swing link shaft 75 is passed through the swing link shaft hole 461 of the front triangle device 100. Each end of the swing link shaft 75 is surrounded by a swing link shaft annular groove 751. The two bottom arm through-holes 741 fit over the ends of the swing link shaft 75. A swing link shaft fixing bolt 76 is screwed into each swing link shaft fixing screw hole 742. A portion of each swing link shaft fixing bolt 76 passes through the top side of each swing link shaft annular groove 751, thereby fixing the swing link shaft 75 between the two bottom arm through-holes 741.

[0220] In addition to the first preferred embodiment described above, the front triangle device 100 of the present invention has one end of the plug 16 inserted into each of the plug holes 144 of the head tube assembly 10 and fixed thereto, so that one end of each of the plugs 16 is connected to each of the upper recesses 142 and the other end of each of the plugs 16 protrudes from each of the upper recesses 142, so that each of the down tube top plate insertion holes 242 of each down tube assembly 20 and each of the top tube front plate insertion holes 342 of the upper tube assembly 30 respectively fits around each of the plugs 16. In other preferred embodiments, each of the plugs 16 can also be configured to be integrally connected to each of the upper recesses 142, such as Figures 13 to 16 The second preferred embodiment of the present invention is shown, and in the second preferred embodiment, the chain stay assembly and the seat stay assembly of the rear triangle device are an integrated device.

[0221] Please see Figures 13 to 16In the second preferred embodiment of the present invention, the modular frame 1A includes a front triangle assembly 100A and a rear triangle assembly 200A. The front triangle assembly 100A includes a head tube assembly 10A, a lower tube assembly 20A, an upper tube assembly 30A, and a center tube assembly 40A. The top end of the lower tube assembly 20A is screwed to the head tube assembly 10A, while the bottom end of the lower tube assembly 20A is screwed to the center tube assembly 40A. The front end of the upper tube assembly 30A overlaps with the top end of the lower tube assembly 20A and is screwed to the head tube assembly 10A, while the rear end of the upper tube assembly 30A is screwed to the center tube assembly 40A. The rear triangle assembly 200A is coupled to the center tube assembly 40A of the front triangle assembly 100A.

[0222] The head tube assembly 10A includes a head tube body 12A and a head tube mount 14A connected to the head tube body 12A. The head tube body 12A is a vertically arranged circular tube. The head tube mount 14A has two head tube side plates 141A on opposite left and right sides. The head tube body 12A is connected between the front sides of the two head tube side plates 141A. Each head tube side plate 141A has an upper recess 142A on its outer side. Each upper recess 142A includes a deep section 1421A with a relatively deep recess and a shallow section 1422A with a relatively shallow recess. Each deep section 1421A is recessed inward from the rear side of the shallow section 1422A. A plug 16A is connected to the deep section 1421A of each upper recess 142A, and each upper recess 142A has two upper recess screw holes 143A.

[0223] The down tube assembly 20A includes a down tube body 22A, which is an obliquely arranged, elongated sheet metal component. The top and left sides of each down tube body 22A are connected to two down tube top plates 24A, while the bottom and left sides of each down tube body 22A are connected to two down tube bottom plates 26A. Each down tube top plate 24A has two down tube top plate through-holes 241A and a down tube top plate insertion hole 242A; each down tube bottom plate 26A has a down tube bottom plate through-hole 261A and a down tube bottom plate insertion hole 262A. A shock absorber front pivot seat 28A is provided on the down tube body 22A, toward the rear of the mid-tube assembly 40A. This shock absorber front pivot seat 28A has a pair of front pivot seat lugs 281A, each of which has a front pivot seat through-hole 282A.

[0224] The upper tube assembly 30A comprises an upper tube body 32A. The upper tube body 32A is a straight tube extending in the front-to-back direction. The left and right sides of the front end of the upper tube body 32A are connected to two upper tube front plates 34A. The rear end of the upper tube body 32A is connected to a middle tube connector 321A. Each upper tube front plate 34A has two upper tube front plate through-holes 341A and a upper tube front plate insertion hole 342A.

[0225] Each upper tube front plate 34A of the upper tube assembly 30A is inserted into the deep section 1421A of each upper recess 142A of the head tube mount 14A; each upper tube front plate through-hole 341A is aligned with each upper recess screw hole 143A, and each upper tube front plate insertion hole 342A is fitted around each plug 16A. Each lower tube top plate 24A of the lower tube assembly 20A is inserted into the shallow section 1422A of each upper recess 142A of the head tube mount 14A, with the rear side of each lower tube top plate 24A overlapping with each upper tube front plate 34A; each lower tube top plate through-hole 241A is aligned with each upper recess screw hole 143A and each upper tube front plate through-hole 341A, and each lower tube top plate insertion hole 242A is fitted around each plug 16A. A first bolt 25A is passed through each of the upper tube front plate through-holes 341A and each of the lower tube top plate through-holes 241A. Each of the first bolts 25A is screwed into each of the upper recessed screw holes 143A, thereby screwing the top end of the lower tube assembly 20A and the front end of the upper tube assembly 30A to the head tube assembly 10A.

[0226] The mid-tube assembly 40A includes a mid-tube body 42A and a drive assembly mount 44A. The mid-tube body 42A is a vertically arranged tube. The drive assembly mount 44A serves as a frame for mounting the bicycle's mid-mounted motor, and is connected to the bottom end of the mid-tube body 42A. In other preferred embodiments, the drive assembly mount 44A may also be a bottom bracket assembly for mounting the bicycle's bottom bracket. The top of the mid-tube body 42A, facing the front of the head tube assembly 10A, has a top tube connector 421A. A swing arm mount 46A is located in the middle of the mid-tube body 42A, facing the down tube assembly 20A. The swing arm mount 46A connects between the mid-tube body 42A and the drive assembly mount 44A. The drive assembly base 44A has a base 441A on the front side of the down tube assembly. The base 441A has two base side panels 442A on opposite sides. Each base side panel 442A has a lower recess 443A on its outer side. Each lower recess 443A has a lower recess screw hole 444A and a rod insertion hole 445A. A chainstay assembly pivot seat 446A is provided on the rear side of the drive assembly base 44A, facing away from the down tube assembly 20A.

[0227] The middle tube connector 321A at the rear end of the upper tube assembly 30A rests rearwardly against the upper tube connector 421A and is screwedly engaged with the upper tube connector 421A of the middle tube body 42A. Each lower tube base 26A of the lower tube assembly 20A fits into each lower recess 443A of the base 441A. The lower tube base through-hole 261A of each lower tube base 26A aligns with each lower recess screw hole 444A, and each lower tube base insertion hole 262A aligns with each rod insertion hole 445A. A second bolt 27A is inserted through each lower tube base through-hole 261A and screwed into each lower recess screw hole 444A. This secures the bottom end of the lower tube assembly 20A to the drive assembly base 44A of the middle tube assembly 40A.

[0228] The rear triangle 200A includes a chain stay assembly 50A, a seat stay assembly 60A, and a swing link 70A. The front end of the chain stay assembly 50A is pivotally connected to the chain stay assembly pivot seat 446A of the center tube assembly 40A. The front end of the seat stay assembly 60A has a rear shock absorber pivot seat 68A, and the rear end of the seat stay assembly 60A is integrally connected to the rear end of the chain stay assembly 50A. The top end of the swing link 70A is pivotally connected to the rear shock absorber pivot seat 68A, and the bottom end of the swing link 70A is pivotally connected to the swing link seat 46A of the center tube assembly 40A.

[0229] In addition to the first preferred embodiment described above, the rear triangle device 200 of the present invention is combined with the assembled front triangle device 100. In other preferred embodiments, the rear triangle device 200 can also be combined with an integrated front triangle device, such as Figures 17 to 19 The third preferred embodiment of the present invention is shown.

[0230] Please see Figures 17 to 19 In the third preferred embodiment of the present invention, the modular frame 1B includes a front triangle 100B and a rear triangle 200B. The front triangle 100B comprises a head tube 10B, a down tube 20B, a top tube 30B, and a center tube assembly 40B. The front ends of the down tube 20B and the top tube 30B are connected to the head tube 10B. A front shock absorber pivot seat 28B is formed on the rear side of the down tube 20B. The bottom end of the down tube 20B and the rear end of the top tube 30B are connected to the center tube assembly 40B. In other preferred embodiments, the front shock absorber pivot seat 28B may also be formed on the bottom side of the top tube 30B.

[0231] The mid-tube assembly 40B includes a mid-tube body 42B and a drive assembly mount 44B. The mid-tube body 42B is a vertically arranged tube. The drive assembly mount 44B serves as a frame for mounting the bicycle's mid-mounted motor and is connected to the bottom end of the mid-tube body 42B. In other preferred embodiments, the drive assembly mount 44B can also be a bottom bracket assembly for mounting the bicycle's bottom bracket. The mid-tube body 42B has a swing arm mount 46B on the side facing the down tube 20B. This swing arm mount 46B has a swing arm axis hole 461B, through which a swing arm axle 75B passes. The drive assembly mount 44B has a chain stay assembly pivot mount 446B on the rear side facing away from the down tube 20B. This chain stay assembly pivot mount 446B has a chain stay axle hole 447B, through which a chain stay axle 58B passes.

[0232] The structure of the rear triangle assembly 200B is identical to that of the rear triangle assembly described in the first preferred embodiment. The rear triangle assembly 200B includes a chain stay assembly 50B, a seat stay assembly 60B, and a swing link 70B. The front end of the chain stay assembly 50B is coupled to the chain stay axle 58B, thereby pivotally connecting the front end of the chain stay assembly 50B to the chain stay assembly pivot seat 446B of the mid-tube assembly 40B. The front end of the seat stay assembly 60B has a rear shock absorber pivot seat 68B, and the rear end of the seat stay assembly 60B is pivotally connected to the rear end of the chain stay assembly 50B. The top end of the swing link 70B is pivotally connected to the rear shock absorber pivot seat 68B, and the bottom end of the swing link 70B is coupled to the swing link axle 75B, thereby pivotally connecting the bottom end of the swing link 70B to the swing link seat 46B of the mid-tube assembly 40B.

[0233] The above description is only a preferred embodiment of the present invention. Any equivalent changes made by applying the description and claims of the present invention should be included in the patent scope of the present invention.

Claims

1. A modular frame, characterized in that: It comprises a front triangle device and a rear triangle device coupled to the front triangle device, wherein: The front triangle device includes a head tube assembly, a lower tube assembly, a top tube assembly and a middle tube assembly; one end of the lower tube assembly is screwed to the head tube assembly, and the other end of the lower tube assembly is screwed to the middle tube assembly; one end of the top tube assembly overlaps with one end of the lower tube assembly and is screwed to the head tube assembly, and the other end of the top tube assembly is screwed to the middle tube assembly; The rear triangle device is combined with the middle tube assembly of the front triangle device.

2. The modular frame according to claim 1, wherein: The head tube assembly includes a head tube body and a head tube mount connected to the head tube body; the head tube mount has an upper recess on two sides facing opposite directions, each of the upper recesses having two upper recess screw holes; the down tube assembly includes a down tube body, one end of each down tube body being connected to two down tube top plates, each down tube top plate having two down tube top plate through-holes; each down tube top plate is embedded in each upper recess, and each down tube top plate through-hole is directly opposite to each up recess screw hole; The upper tube assembly has an upper tube body, one end of which is connected to two upper tube front plates, each of which has two upper tube front plate through-holes, each of which overlaps with each of the lower tube top plates, and each of the upper tube front plate through-holes faces each of the lower tube top plate through-holes, a first bolt is passed through each of the upper tube front plate through-holes and each of the lower tube top plate through-holes, and each of the first bolts is screwed into each of the upper recessed screw holes.

3. The combined vehicle frame according to claim 2, wherein: Each of the upper recesses is connected to a plug; each of the lower tube top plates has a lower tube top plate insertion hole, and each of the lower tube top plate insertion holes is sleeved on each of the plugs; each of the upper tube front plates has an upper tube front plate insertion hole, and each of the upper tube front plate insertion holes is sleeved on each of the plugs.

4. The combined vehicle frame according to claim 3, wherein: The head tube seat has two head tube side plates on two sides facing opposite directions, each upper recess is formed on the outer side of each head tube side plate; each head tube side plate has a bolt hole, each bolt hole passes through each upper recess, and each head tube side plate also has a bolt fixing screw hole, each bolt fixing screw hole is tangent to one side around each bolt hole; one end of each bolt is inserted into each bolt hole and has a bolt annular groove around it, and the other end of each bolt protrudes from each upper recess; a bolt fixing bolt is screwed into each bolt fixing screw hole, and a portion of each bolt fixing bolt is inserted into one side of the bolt annular groove of each bolt, thereby fixing each bolt to each bolt hole.

5. The modular frame according to claim 3, wherein: Each of the upper recesses includes a deep section with a deeper recess and a shallow section with a shallower recess, each of the plugs is connected to the deep section of each of the upper recesses, and the two upper recess screw holes are formed in the deep section of each of the upper recesses; each of the upper tube front plates is embedded in the deep section of each of the upper recesses, and each of the lower tube top plates is embedded in the shallow section of each of the upper recesses.

6. The modular frame according to claim 2, wherein: The middle tube assembly includes a middle tube body and a driving assembly seat connected to the middle tube body; the driving assembly seat has a lower recess on both sides facing opposite directions, and each of the lower recess has a lower recess screw hole; the other end of the lower tube body is connected to two lower tube bottom plates, and each of the lower tube bottom plates has a lower tube bottom plate through-hole; each of the lower tube bottom plates is embedded in each of the lower recesses, and each of the lower tube bottom plate through-holes is directly opposite to each of the lower recess screw holes; a second bolt is inserted through each of the lower tube bottom plate through-holes, and each of the second bolts is screwed into each of the lower recess screw holes.

7. The modular frame according to claim 6, wherein: The driving assembly seat has a base on the side facing the lower tube assembly, and the base has two base side panels on both sides facing opposite directions, each of the recessed portions is formed on the outer side of each of the base side panels, and each of the recessed portions also has a rod insertion hole; each of the lower tube bottom plates has a lower tube bottom plate insertion hole, and each of the lower tube bottom plate insertion holes is directly opposite to each of the rod insertion holes; a rod is inserted through each of the lower tube bottom plate insertion holes, one end of each rod is inserted into each rod insertion hole, and the other end of each rod is combined with a fixing plate, and each fixing plate is screwed to each of the lower tube bottom plates.

8. The modular frame according to claim 2, wherein: The middle tube assembly includes a middle tube body and a drive assembly seat connected to the middle tube body, the middle tube body has an upper tube connecting seat on one side facing the head tube assembly, and the middle tube body has a tail seat on the other side facing away from the head tube assembly, and the tail seat has a tail seat recess; the other end of the upper tube body has a middle tube connecting seat, the middle tube connecting seat is screwed together with the upper tube connecting seat, and the middle tube connecting seat is connected to two upper tube rear plates on both sides facing opposite directions, the two upper tube rear plates extend in a direction away from the upper tube body and pass through both sides of the middle tube body, and a tail seat fixing piece is detachably combined between the two upper tube rear plates, and the tail seat fixing piece is embedded in the tail seat recess.

9. The modular frame according to claim 8, wherein: The two ends of the tailstock fixing piece in opposite directions are screwed to the rear plates of the two upper tubes; a rear fender bracket is arranged in conjunction with the tailstock, one end of the rear fender bracket has a screw lock seat, the screw lock seat is screwed together with the tailstock, and the screw lock seat has a screw lock seat recess, the screw lock seat recess and the tailstock recess are surrounded by the tailstock fixing piece; the other end of the rear fender bracket is connected to a rear fender.

10. The modular vehicle frame according to claim 6, wherein: The drive assembly seat has a rear chain stay assembly pivot seat on the other side away from the lower tube assembly, and the rear chain stay assembly pivot seat has a rear chain stay axis hole; the middle tube body has a swing rod seat on the side facing the lower tube assembly, and the swing rod seat has a swing rod axis hole; the lower tube assembly or the upper tube assembly has a shock absorber front pivot seat; A chain stay axle is passed through the chain stay axle hole, and a swing link axle is passed through the swing link axle hole; the rear triangle device includes a chain stay assembly, a seat stay assembly and a swing link; one end of the chain stay assembly is coupled to the chain stay axle, one end of the seat stay assembly has a shock absorber rear pivot seat, and the other end of the seat stay assembly is pivotally connected to the other end of the chain stay assembly; one end of the swing link is pivotally connected to the shock absorber rear pivot seat, and the other end of the swing link is coupled to the swing link axle.

11. A modular frame, characterized in that: It comprises a front triangle device and a rear triangle device coupled to the front triangle device, wherein: The front triangle device includes a head tube, a middle tube assembly, and a lower tube and a top tube respectively connected between the head tube and the middle tube assembly; the middle tube assembly includes a middle tube body and a drive assembly seat connected to the middle tube body; the drive assembly seat has a rear chain stay assembly pivot seat on a side facing away from the lower tube, the rear chain stay assembly pivot seat has a rear chain stay axis hole, and a rear chain stay axis is passed through the rear chain stay axis hole; the middle tube body has a swing rod seat on a side facing the lower tube, the swing rod seat has a swing rod axis hole, and a swing rod axis is passed through the swing rod axis hole; the top tube or the down tube has a shock absorber front pivot seat; The rear triangle device includes a chain stay assembly, a seat stay assembly and a swing link; one end of the chain stay assembly is coupled to the chain stay shaft, and one end of the seat stay assembly has a shock absorber rear pivot seat; one end of the swing link is pivotally connected to the shock absorber rear pivot seat, and the other end of the swing link is coupled to the swing link shaft.

12. The modular vehicle frame according to claim 11, wherein: The chain fork assembly includes two chain fork side rods, one end of each chain fork side rod is connected to a chain fork front plate, and the other end of each chain fork side rod is pivotally connected to the other end of the chain fork assembly; the inner sides of the two chain fork front plates are respectively provided with a non-circular connecting groove, and the two chain fork front plates are detachably connected to a connecting block, and the two sides of the connecting block in opposite directions are provided with two connecting protrusions, and each connecting protrusion is embedded in the connecting groove; each chain fork front plate has a chain fork front plate through-hole, and the two chain fork front plate through-holes are fitted over the two ends of the chain fork shaft.

13. The modular vehicle frame according to claim 12, wherein: The seat fork assembly includes two seat fork side rods, one end of each seat fork side rod is connected to a seat fork front plate, and the shock absorber rear pivot seat is detachably combined between the two seat fork front plates; the other end of each seat fork side rod is connected to a rear wheel axle seat, the two rear wheel axle seats respectively have a rear wheel axle hole, and each rear wheel axle seat has a pair of rear wheel axle seat lugs, and the pair of rear wheel axle seat lugs have a rear wheel axle seat lug through-hole; the other end of each chain fork side rod is inserted between the pair of rear wheel axle seat lugs and has a rear rotating shaft hole, a rear rotating shaft is fixed through each rear wheel axle seat lug through-hole, and each rear rotating shaft pivots through each rear rotating shaft hole.

14. The modular vehicle frame according to claim 13, wherein: wherein each of the rear seat fork front plates has a rear seat fork front plate through-hole and a rear seat fork front plate axle hole; the shock absorber rear pivot seat includes two rear pivot seat side rods and a connecting rod, wherein the connecting rod is connected between the two rear pivot seat side rods; each of the rear pivot seat side rods leans against the inner side of each of the rear seat fork front plates and has a rear pivot seat side rod screw hole and a rear pivot seat side rod axle hole, each of the rear pivot seat side rod screw holes faces each of the rear seat fork front plate through-holes, and each of the rear pivot seat side rod axle holes faces each of the rear seat fork front plate axle holes; a rear pivot seat bolt is passed through each of the rear seat fork front plate through-holes, and each of the rear pivot seat bolts is screwed into each of the rear pivot seat side rod screw holes; The swing link has two top arms on the side facing the rear pivot seat of the shock absorber, and each top arm has a top arm axis hole; a pivot axis is fixed through the axis hole of each rear upper fork front plate, the axis hole of each rear pivot seat side rod, and the axis hole of each top arm; the swing link has two bottom arms on the other side away from the rear pivot seat of the shock absorber, and the two bottom arms respectively have a bottom arm through-hole, and the two bottom arm through-holes are fitted on the two ends of the swing link axis.

15. The modular vehicle frame according to claim 14, wherein: The front pivot seat of the shock absorber has a pair of front pivot seat lugs, and the pair of front pivot seat lugs have a front pivot seat through-hole; each of the rear seat fork front plates is a long strip plate body, and the free end of one of the two rear seat fork front plates has a rear pivot screw hole, and the free end of the other rear seat fork front plate has a rear pivot countersunk hole; each of the rear pivot seat side rods is a long strip plate body, and the free end of each of the rear pivot seat side rods has a rear pivot through-hole, and the two rear pivot through-holes are aligned with the rear pivot screw hole and the rear pivot countersunk hole.

16. The modular vehicle frame according to claim 12, wherein: Each of the front plates of the chain forks further comprises a chain fork axle fixing screw hole, each of the chain fork axle fixing screw holes is tangent to one side around the through-hole of each of the front plates of the chain forks; a chain fork axle annular groove is respectively formed around both ends of the chain fork axle; a chain fork axle fixing bolt is screwed into each of the chain fork axle fixing screw holes, and a portion of each of the chain fork axle fixing bolts is inserted into one side of the through-hole of each of the front plates of the chain forks, thereby fixing the chain fork axle to the through-hole of each of the front plates of the chain forks.

17. The modular vehicle frame according to claim 13, wherein: One of each pair of rear wheel axle seat lugs further has a rear shaft fixing screw hole, and each rear shaft fixing screw hole is tangent to one side around the through-hole of each rear wheel axle seat lug; a rear shaft annular groove is formed around each rear shaft; a rear shaft fixing bolt is screwed into each rear shaft fixing screw hole, and a portion of each rear shaft fixing bolt is inserted into one side of the annular groove of each rear shaft, thereby fixing each rear shaft to the through-hole of each rear wheel axle seat lug.

18. The modular vehicle frame according to claim 14, wherein: Each of the front plates of the rear seat forks further comprises a pivot shaft fixing screw hole, each of the pivot shaft fixing screw holes is tangent to one side around the axis hole of each of the front plates of the rear seat forks; a pivot shaft annular groove is formed around the pivot shaft; a pivot shaft fixing bolt is screwed into each of the pivot shaft fixing screw holes, and a portion of each of the pivot shaft fixing bolts is inserted into one side of the pivot shaft annular groove, thereby fixing the pivot shaft to the axis hole of each of the front plates of the rear seat forks.

19. The modular vehicle frame according to claim 14, wherein: Each of the bottom arms also has a swing arm shaft fixing screw hole, and each of the swing arm shaft fixing screw holes is tangent to one side around the bottom arm through-hole; a swing arm shaft annular groove is respectively provided around the two ends of the swing arm shaft; a swing arm shaft fixing bolt is screwed into each of the swing arm shaft fixing screw holes, and a portion of each of the swing arm shaft fixing bolts is inserted into one side of the swing arm shaft annular groove, thereby fixing the swing arm shaft to each of the bottom arm through-holes.

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