KR102103462B1 - Bicycle frame by injection molding - Google Patents

Abstract

The present invention relates to a bicycle frame manufactured by an injection molding method.
The present invention exerts the following effects.
In other words, the injection molding and assembly is easy, and the internal density is minimized to make the bicycle ultra-light, while distributing the load efficiently, thereby providing excellent durability.

Description

Bicycle frame for injection molding {BICYCLE FRAME BY INJECTION MOLDING}

The present invention relates to a bicycle frame manufactured by an injection molding method.

A typical bicycle frame is manufactured by welding using aluminum, and a plastic bicycle frame by injection molding has recently emerged.

Patent No. 10-1346783 also presents an integrated frame manufactured by injection method, specifically, a saddle, a seat post supporting the saddle, and front and rear wheels respectively at the front and rear, and both ends of the front wheel axle. Silver is installed on the suspension fork, the top of the suspension fork is installed a head tube that the shaft of the handle is rotatably coupled, both ends of the rear wheel shaft are installed in the chain stay, the chain stay and the head tube are connected by a frame, In a typical bicycle with a crankshaft hole formed to fit a crankshaft on which a bicycle pedal is installed, the saddle, seatpost, head tube, chainstay, and frame are formed as an integral frame through an injection method. It is characterized in that the seat stay connecting the rear wheel axle and the seat post is omitted. An integrated frame bicycle is proposed.

Registered Patent No. 10-1346783 (2013.12.24.)

The problems to be solved in the present invention are as follows.

That is, the present invention is intended to present a bicycle frame capable of efficiently distributing a load while minimizing the internal density by minimizing the internal density as a structure for injection molding and assembly.

The left and right frames are assembled by injection molding, respectively, and an empty space is formed in the assembled state and a plurality of ribs protruding from the inner surface of the frame are formed.

A head tube 100 having a handle post inserting portion 110 for fixing the handle post 11; Bibicell 700 is coupled to the pedal shaft; A rear wheel coupling portion 800 to which the rear wheel shaft 81 is coupled; A down tube 400 connecting the head tube 100 and the vicell 700 and having an empty space therein; A seat post inserting part 310 for fixing the seat post 31 on the upper part, and a seat tube 300 connected to the rear end of the down tube 400; A top tube 200 connecting the top of the head tube 100 and the seat tube 300 and having an empty space therein; A chain stay 600 that connects the BB cell 700 and the rear wheel coupling part 800; Including, the seat stay 500 connecting the central one side of the seat tube 300 and the rear wheel coupling part 800, wherein the top tube 200 extends from the head tube 100 to the top of the seat tube 300 Tensile force reinforcing ribs 210 protruding from the inner surface of the top tube 200 in a straight form, and load distribution ribs protruding from the inner surface of the top tube 200 in a straight line crossing perpendicular to the tensile force reinforcing rib 210 ( 220), a tensile strength reinforcing rib 210 or a load distribution rib 220 and a density reinforcing rib 230 formed to protrude from the inner surface of the top tube 200 in a straight line intersecting the diagonal line, including the down tube 400 ) Is a straight line that extends from the head tube 100 to the BB cell 700 in a straight line that intersects the tensile force reinforcement rib 410 and the tensile force reinforcement rib 410 that protrude from the inner surface of the down tube 400. The load distribution rib 420, which protrudes from the inner surface of the down tube 400, and the tensile force beam It characterized in that it comprises a density reinforcing rib 430 that protrudes from the inner surface of the down tube 400 in a straight line crossing diagonally with the steel rib 410 or the load distribution rib 420,

The seat tube 300 has an empty space formed therein, and a vertical load protruding from the inner surface of the seat tube 300 in a straight line from the top of the seat post inserting section 310 to the rear end of the down tube 400. Reinforcement ribs 320, vertical load reinforcement ribs 320 crossing the pedal load reinforcement ribs that protrude from the inner surface of the seat tube 300 in a straight form that extends to the bicell 700 in a direction in which a load is applied to the pedal shaft. (330), characterized in that it comprises a seat tube 300 or a density reinforcement rib 340 formed to protrude from the inner surface of the seat tube 300 in a straight line crossing the diagonal line with the pedal load reinforcement rib 330,

The seat stay 500 has an empty space formed therein, and a tensile force reinforcement rib 510 that protrudes from the inner surface of the seat stay 500 in a straight line from the seat tube 300 to the rear wheel coupling part 800, The load distribution rib 520, which is formed to protrude from the inner surface of the seat stay 500 in a straight line crossing perpendicular to the tensile force reinforcing rib 510, crosses diagonally with the tensile force reinforcing rib 510 or the load distribution rib 520. It includes a density reinforcement rib 530 that protrudes from the inner surface of the seat stay 500 in a straight shape, and the chainstay 600 has an empty space formed therein, and the rear wheel coupling part 800 in the vivic cell 700 ), The tensile force reinforcing ribs 610 protruding from the inner surface of the chainstay 600 in a straight line, and the loads protruding from the inner surface of the chainstay 600 in a straight line intersecting the tensile force reinforcing ribs 610. Dispersion rib (620), tensile force reinforcement rib Presenting a bicycle frame for injection molding, characterized in that it comprises a density reinforcement rib 630 protruding from the inner surface of the chainstay 600 in a straight line crossing diagonally with the load distribution ribs 620 or 610. .

The present invention exerts the following effects.

In other words, the injection molding and assembly is easy, and the internal density is minimized to make the bicycle ultra-light, while distributing the load efficiently, thereby providing excellent durability.

1 is a cross-sectional view of the bicycle frame of the present invention.
2 to 5 are diagrams highlighted to explain each rib formed in the space inside the bicycle frame.
6 is a perspective view of a state in which the bicycle frame is finally assembled.
7 is a plan view and a side view of FIG. 6;
8 is an exploded view of a bicycle frame with ribs omitted.
9 is a diagram for a frame fatigue test standard to which a pedal force is applied.
10 is an analysis diagram showing the results of performing the test of FIG. 9.
11 is a diagram for a vertical load fatigue test standard.
12 is an analysis diagram showing the results of performing the test of FIG. 11.
13 is a view of a horizontal load fatigue test standard.
14 and 15 are analysis results of the test of FIG. 13.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the scope of rights of the present invention should be grasped by describing the claims. Also, descriptions of well-known technologies that obscure the subject matter of the present invention will be omitted.

In the description of the present invention, "before" and "after" refer to the front and rear wheels of the bicycle as reference, and "left" and "right" indicate only to the user as reference, and different directions indicate different directions. It will be revealed.

The bicycle frame of the present invention, as shown in Figures 1 and 6 head tube 100, top tube 200, seat tube 300, down tube 400, seat stay 500, chain stay 600, BB It is composed of a shell 700 and a rear wheel coupling part 800, and can be manufactured by dividing the left and right sides of the frame as shown in FIGS. 7 and 8, respectively, and then making contact with each other and then making contact with each other. In addition, a number of ribs are formed in an empty frame, thereby improving durability while effectively dispersing various forces applied to the frame while being light in weight.

1 to 6 are views of the right frame when viewed from the left when the bicycle frame is divided left and right.

The BB shell 700 is a portion to which the pedal shaft is coupled, and the rear wheel coupling portion 800 is a portion to which the rear wheel shaft is coupled.

The head tube 100 is a portion where the handle post inserting portion 110 for fixing the handle post is formed, and the handle post is connected to a fork having a front wheel coupled thereto.

As illustrated in FIG. 3, the handle post inserting unit 110 has a cylindrical through portion through which the handle post passes, and is formed larger than the diameter of the handle post, thereby forming a plurality of vertical ribs 111 and horizontal ribs 112.

The vertical rib 111 is a rib that protrudes from the inner surface of the handle post inserting part 110 in a straight line in the longitudinal direction of the cylinder so as to contact the handle post, and the horizontal rib 112 is a ring wrapped around the outer circumferential surface so as to contact the handle post It is a rib that protrudes from the inner surface of the post insertion section 110. That is, a plurality of vertical ribs 111 and the horizontal ribs 112 are intersecting at right angles, which serves to disperse the vertical load applied to the handle post. At this time, the horizontal rib 112 is formed with a gap between the upper and lower portions of the handle post inserting portion 110, which is an open portion, than the central portion. This is to effectively disperse the force because the load applied to the open portion is greater. .

Meanwhile, as shown in FIGS. 7 and 8, the vertical rib 111 and the horizontal rib 112 are formed on the outer surface of a separate member having a shape such as a cylinder corresponding to the handle post, so that the horizontal rib 112 is formed on the head tube 100. It can also be designed to be assembled.

The down tube 400 connects the head tube 100 and the BB shell 700, and is a portion in which an empty space is formed, and the tensile force reinforcing rib 410, the load distribution rib 420, and the density reinforcing rib 430 are provided. Is formed.

The tensile strength reinforcement rib 410 is a rib that protrudes from the inner surface of the down tube 400 in a straight shape extending from the head tube 100 to the BB shell 700 as shown in FIG. 2, and the load distribution rib 420 is a tensile strength reinforcement As a rib that protrudes from the inner surface of the down tube 400 in a straight line crossing the rib 410 perpendicularly, it is attracted to the down tube 400 due to the load applied to the head tube 100 or the BB shell 700. Alternatively, when a tension is applied, the force is transferred to the tensile force reinforcement rib 410 and distributed by the load distribution rib 420.

The density reinforcing rib 430 is a rib that protrudes from the inner surface of the down tube 400 in a straight line crossing diagonally with the tensile force reinforcing rib 410 or the load distribution rib 420, as shown in FIG. 4, and similarly, the tensile force reinforcing rib The force transmitted to the 410 and the load distribution rib 420 is dispersed. When the load is applied to the down tube 400 and is bent, the edges of the down tube 400 (the upper side (L400a) and the lower side (L400b)) have a relatively higher curvature than the central portion, so the density toward the edge of the down tube 400 increases. It is preferable to make the density of the reinforcing ribs 430 high. At this time, the density of the ribs does not mean the internal density of the ribs itself, but rather how densely a number of ribs are formed.

The seat tube 300 is formed with a seat post inserting part 310 for fixing the seat post on the upper part and a lower end is a part connected to the rear end of the down tube 400, and a saddle is coupled to the seat post. An empty space is formed in the seat tube 300, and a seat post inserting portion 310, a vertical load reinforcement rib 320, a pedal load reinforcement rib 330, and a density reinforcement rib 340 are formed.

The vertical load reinforcing rib 320 is a rib that protrudes from the inner surface of the seat tube 300 in a straight line from the top of the seat post inserting section 310 to the rear end of the down tube 400, and the pedal load reinforcing rib 330 ) Is a rib that protrudes from the inner surface of the seat tube 300 in the form of a straight line that crosses the vertical load reinforcement rib 320 and extends to the BB shell 700 in a direction in which a load is applied to the pedal shaft, and the density reinforcement rib 340 ) Is a rib formed to protrude from the inner surface of the seat tube 300 in a straight line crossing diagonally with the seat tube 300 or the pedal load reinforcement rib 330, perpendicular to the seat tube 300 and the BB shell 700 When a force or tension is applied to the seat tube 300 due to the load applied to it, the force is transmitted to the vertical load reinforcing rib 320 and distributed to the density reinforcing rib 340.

The sheet post inserting part 310 is formed in a column post through the sheet post, as shown in FIG. 3, and is formed to be larger than the diameter of the sheet post, so that the sheet post inserting part 310 is a straight line in the longitudinal direction of the cylinder so as to contact the sheet post on the inner surface. ) Is formed with a vertical rib 311 protruding from the inner surface, and a plurality of transverse ribs 312 protruding from the inner surface of the seat post inserting part 310 with a ring surrounding the outer circumferential surface so as to contact the seat post. That is, a plurality of vertical ribs 311 and the horizontal ribs 312 are intersected at right angles, which serves to distribute the vertical load applied to the seat post and the torsional load due to pedaling. At this time, the horizontal rib 312 is formed with a relatively narrow gap at the upper portion of the seat post inserting portion 310, which is an open portion, because the load applied to the open portion is greater, effectively dispersing the force. It is for sake.

The top tube 200 connects the top of the head tube 100 and the seat tube 300, and is a portion in which an empty space is formed, and the tensile force reinforcement rib 210, the load distribution rib 220, and the density reinforcement rib 230 ) Is formed.

The tensile strength reinforcement rib 210 is a rib that protrudes from the inner surface of the top tube 200 in a straight shape extending from the head tube 100 to the top of the seat tube 300 as shown in FIG. 2, and the load distribution rib 220 is As a rib protruding from the inner surface of the top tube 200 in a straight line crossing perpendicular to the tensile force reinforcing rib 210, the top tube 200 due to a load applied to the head tube 100 or the seat tube 300 When an attractive force or tension is applied to the force, the force is transmitted to the tensile force reinforcement rib 210 and distributed by the load distribution rib 220.

The density reinforcing rib 230 is a rib that protrudes from the inner surface of the top tube 200 in a straight line intersecting diagonally with the tensile force reinforcing rib 210 or the load-distributing rib 220 as shown in FIG. 4, similarly, the tensile force reinforcing rib The force transmitted to the 210 and the load distribution rib 220 is dispersed. When a load is applied to the top tube 200 and is bent, the edges of the top tube 200 (the upper side (L200a) and the lower side (L200b)) have a relatively higher curvature than the center portion, so the density toward the edge of the top tube 200 increases. It is preferable that the density of the reinforcing ribs 230 is high.

On the other hand, as shown in Figure 2, the tensile force reinforcing rib 210 and the tensile force reinforcing rib 410 are preferably configured to extend to the handle post inserting portion 110 to cross each other. In addition, a thick additional reinforcing rib 411 crosses the tensile force reinforcing rib 410 on a straight line toward the center of the seat tube 300 from the bottom of the handle post inserting portion 110 to be designed to be a more stable structure. It might be.

The chain stay 600 is a part connecting the BB shell 700 and the rear wheel coupling part 800, and an empty space is formed therein, and the tensile force reinforcement rib 610, the load distribution rib 620, and the density reinforcement rib ( 630) is formed.

The tensile force reinforcement rib 610 is a rib that protrudes from the inner surface of the chainstay 600 in a straight line form from the BB shell 700 to the rear wheel coupling portion 800, and the load distribution rib 620 is a tensile force reinforcement rib 610 ) The ribs and the density reinforcing ribs 630 that protrude from the inner surface of the chainstay 600 in a straight line intersecting perpendicularly are in a straight line intersecting diagonally with the tensile force reinforcing ribs 610 or the load distribution ribs 620. It is a rib that protrudes from the inner surface of the chain stay 600. When an attractive force or tension is applied to the chain stay 600 due to the load applied to the chain stay 600 and the torsional load due to pedaling, the force is distributed to the load distribution rib 620 when it is transmitted to the tensile force reinforcement rib 610.

The seat stay 500 is a part connecting the central one side of the seat tube 300 and the rear wheel coupling part 800, and an empty space is formed therein, and the tensile force reinforcing rib 510, the load distribution rib 520, and the density Reinforcing ribs 530 are formed.

The tensile force reinforcement rib 510 is a rib that protrudes from the inner surface of the seat stay 500 in a straight line form from the seat tube 300 to the rear wheel coupling portion 800, and the load distribution rib 520 is a tensile force reinforcement rib 510 ) Is a rib that protrudes from the inner surface of the seat stay 500 in a straight line intersecting perpendicularly, and of the seat stay 500 in a straight line crossing diagonally with the tensile force reinforcing rib 510 or the load distribution rib 520. It is a rib that protrudes from the inner surface. Due to the load applied to the seat stay 500, when a force or tension is applied to the seat stay 500, the force is transmitted to the tensile force reinforcing rib 510, thereby being applied by the load distribution rib 520 and the density reinforcing rib 530. Is distributed.

All ribs formed in the space inside the bicycle frame are designed to run seamlessly. In other words, all ribs intersect or one rib contacts another. In addition, the relative density of the density reinforcement ribs 230, 430, 530, 630, 340 has the largest density reinforcement rib 530 of the seat stay 500, the chain stay 600, the top tube 200, the seat tube 300, the down tube 400. Design in order to have low density. This is a structure that allows the load to be distributed as efficiently as possible while keeping the density inside the bicycle frame as low as possible.

9 to 15 show various fatigue tests performed on the bicycle frame of the structure shown in FIG. 1 of the present invention and the results.

1. Frame fatigue test with pedal force applied

(Test specification) Refer to Fig. 9

A repeated force of 1,000 N (102 kg) is applied to both sides of the pedal spindle at an angle of 7.5 ° to the front and rear planes of the vehicle body and 150 mm from the centerline of the vehicle body in the vertically opposite plane. During the test by applying this force, the pedal force should be 5% or less than the maximum force before the application of the pedal spindle test force starts.

Test force is applied for 100,000 cycles and applied for one cycle of test, followed by removal of both test forces. When testing the suspension frame, adjust the spring, air pressure and damping of the suspension to maximize the resistance received by the frame. If the suspension does not have a locking device, test it by replacing it with a fixed link.

(Description of drawing symbols)

F: 1,000 N applied force

Rw: height of rigid mount

Rc: Length of vertical arm

L: length of crank

1: Joint

2: Centerline of the knot stick

The results are presented in FIG. 10 and it can be confirmed that the measurement conditions for displacement, strain and stress satisfy the reference conditions.

2. Vertical load fatigue test

(Test specification) Refer to Fig. 11

It is necessary to fix the vehicle body in the basic position and prevent departure from the rear as shown in FIG. 11 so as not to be restricted by rotation. While applying the test force, fit the appropriate roller on the front axle, allowing bodywork against bending at the front and rear.

A round steel bar is equally inserted into the saddle stem above the saddle tube and secured by the usual fastening method.

The force is applied in a dynamic cycle from 0 to 1,200 N (122 kg) in the vertical direction at a point 70 mm (± 1 mm accuracy) across the axis of the steel bar.

Apply and test 50,000 cycles at test frequency not exceeding 25 Hz in extended part E.

(Description of drawing symbols)

1. Free roller

2. Steel bar

3. Connection to a fixed shock absorber or a chain stabilizer that becomes a shaft

The results are presented in FIG. 12 and it can be confirmed that the measurement conditions for displacement, strain and stress satisfy the reference conditions.

3. Horizontal load fatigue test

(Test specification) Refer to Fig. 13

In the basic position, the vehicle body should be fixed, and as shown in FIG. 13, the rear side should be prevented from being disengaged to prevent rotation.

As shown in Figure 3, a strong horizontal force of +1,200 N is applied in the forward direction through the front and rear axes, and a force of -600 N is applied 50,000 times toward the bottom of the front fork of the opposite axis. Even if the front fork is pushed down vertically, it should be able to move freely forward and backward. The maximum frequency should be 25 Hz.

(Description of drawing symbols)

1.Roller with guide and rolling freely

2. Robust pivot device at the point where the heel is attached

The results are presented in FIGS. 14 and 15, and it can be confirmed that the measurement conditions for displacement, strain and stress satisfy the reference conditions.

The present invention described above is not limited by the above-described embodiments and the accompanying drawings, and various substitutions, modifications and changes are possible within the scope of the present invention without departing from the technical spirit of the present invention. It will be clear to those who have knowledge.

100: head tube
110: handle post inserting part
111: vertical rib
112: horizontal rib
200: top tube
210: tensile force reinforcement rib
220: load distribution rib
230: density reinforcement rib
300: seat tube
310: seat post inserting part
311: vertical rib
312: horizontal rib
320: Vertical load reinforcement rib
330: pedal load reinforcement rib
340: density reinforcement rib
400: down tube
410: tensile force reinforcement rib
411: Additional reinforcement rib
420: Load distribution rib
430: Density reinforcement rib
500: seat stay
510: Tensile force reinforcement rib
520: Load distribution rib
530: Density reinforcement rib
600: chain stay
610: Tensile force reinforcement rib
620: Load distribution rib
630: Density reinforcement rib
700: Vivicell
800: rear wheel coupling

Claims (4)

delete A head tube 100 having a handle post inserting portion 110 for fixing the handle post 11;
Bibicell 700 is coupled to the pedal shaft;
A rear wheel coupling portion 800 to which the rear wheel shaft 81 is coupled;
A down tube 400 connecting the head tube 100 and the vicell 700 and having an empty space therein;
A seat post inserting part 310 for fixing the seat post 31 at the upper part, the lower end being connected to the rear end of the down tube 400, and an empty space formed therein;
A top tube 200 connecting the top of the head tube 100 and the seat tube 300 and having an empty space therein;
A chainstay 600 that connects the Vivicell 700 and the rear wheel coupling part 800 and has an empty space formed therein;
Includes; connecting the central one side of the seat tube 300 and the rear wheel coupling portion 800, an empty space is formed therein;

The handle post inserting portion 110 is formed to be larger than the diameter of the cylindrical post through the handle post 11, the diameter of the handle post 11,
A plurality of vertical ribs 111 formed to protrude from the inner surface of the handle post inserting portion 110 in a straight line in the longitudinal direction of the cylinder so as to contact the handle post 11,
The ring surrounding the outer circumferential surface so as to contact the handle post 11 is formed to protrude from the inner surface of the handle post insert 110, and includes a plurality of transverse ribs 112 that intersect at right angles to the vertical rib 111,

The horizontal rib 112 is
Characterized in that the gap between the upper portion and the lower portion of the handle post inserting portion 110 which is an open portion is formed narrower than the central portion,

The top tube 200 is formed so that the edges (the upper side (L200a) and the lower side (L200b)) have a greater curvature than the central portion,
It is formed to protrude from the inner surface of the top tube 200 in a straight line form extending from the handle post inserting portion 110 to the top of the seat tube 300, the tensile force reinforcement rib 210 crossing the tensile force reinforcement rib 410,
Load distribution rib 220 that protrudes from the inner surface of the top tube 200 in a straight line crossing perpendicular to the tensile force reinforcement rib 210,
A tensile strength reinforcement rib 210 or a load distribution rib 220 and a density reinforcement rib 230 formed to protrude from the inner surface of the top tube 200 in a straight line crossing diagonally,

The density reinforcement rib 230
It characterized in that the density is formed higher toward the edges (top side (L200a) and bottom side (L200b)) of the top tube 200,

The seat tube 300 is
Vertical load reinforcement rib 320 is formed to protrude from the inner surface of the seat tube 300 in a straight line form from the top of the seat post inserting section 310 to the rear end of the down tube 400,
Pedal load reinforcement ribs 330 that protrude from the inner surface of the seat tube 300 in a straight line that crosses the vertical load reinforcement ribs 320 and extends to the Vivicel 700 in a direction in which a load is applied to the pedal shaft,
The seat tube 300 or the pedal load reinforcement rib 330 and a density reinforcement rib 340 formed to protrude from the inner surface of the seat tube 300 in a straight line crossing diagonally,

The sheet post inserting portion 310 is formed to be larger than the diameter of the sheet post 31, the through portion of the cylindrical shape through which the sheet post 31 passes,
A plurality of vertical ribs 311 protruding from the inner surface of the seat post inserting portion 310 in a straight line in the length direction of the cylinder so as to contact the seat post 31;
A ring surrounding the outer circumferential surface so as to abut against the seat post 31 is formed protruding from the inner surface of the seat post inserting portion 310, and includes a plurality of transverse ribs 312 that intersect at right angles to the vertical ribs 311,

The horizontal rib 312 is characterized in that the gap in the upper portion of the seat post inserting portion 310 that is an open portion is formed narrower than the middle portion and the lower portion,

The down tube 400 is formed so that the edges (the upper side (L400a) and the lower side (L400b)) have a greater curvature than the central portion,
It is formed to protrude from the inner surface of the down tube 400 in the form of a straight line extending from the handle post inserting portion 110 to the BB cell 700, the tensile force reinforcing rib 410 crossing the tensile force reinforcing rib 210,
It is formed on a straight line toward the center of the seat tube 300 from the bottom of the handle post insertion portion 110, the additional reinforcement rib 411 formed to cross the tensile force reinforcement rib 410,
Load distribution rib 420 formed to protrude from the inner surface of the down tube 400 in a straight line crossing perpendicular to the tensile force reinforcing rib 410,
A tensile strength reinforcement rib 410 or a load distribution rib 420 and a density reinforcement rib 430 formed to protrude from the inner surface of the down tube 400 in a straight line crossing diagonally,

The density reinforcement rib 430
It characterized in that the density becomes higher toward the edges of the down tube 400 (the upper side (L400a) and the lower side (L400b)),

The seat stay 500 is
Tensile force reinforcing rib 510 that protrudes from the inner surface of the seat stay 500 in a straight line form from the seat tube 300 to the rear wheel coupling part 800,
Load distribution rib 520 is formed to protrude from the inner surface of the seat stay 500 in a straight line crossing perpendicular to the tensile force reinforcement rib 510,
A tensile strength reinforcement rib 510 or a load distribution rib 520 and a density reinforcement rib 530 formed to protrude from the inner surface of the seat stay 500 in a straight line crossing diagonally,

The chain stay 600 is
Tensile force reinforcing rib 610 that protrudes from the inner surface of the chainstay 600 in a straight line form from the Vivicell 700 to the rear wheel coupling part 800,
Load distribution rib 620 formed to protrude from the inner surface of the chainstay 600 in a straight line crossing perpendicular to the tensile force reinforcement rib 610,
A tensile strength reinforcement rib (610) or a load distribution rib (620) and a density reinforcement rib (630) formed to protrude from the inner surface of the chain stay (600) in a straight line crossing diagonally,

The density reinforcement ribs (230,430,530,630,340)
The density reinforcement rib 530 of the seat stay 500 has the largest density, the density reinforcement rib 630 of the chainstay 600, the density reinforcement rib 230 of the top tube 200, and the seat tube 300. Density reinforcing ribs 340, the density reinforcing ribs 430 of the down tube 400, characterized in that formed in order of low density
Bicycle frame for injection molding. delete delete

Images