TWI669237B - Front fork and bicycle frame assembly including the same - Google Patents

Abstract

The present invention relates to a front fork that is pivotable to a shaft portion of a bicycle frame and is coupled to a hub of a wheel body and a handle portion that is transverse to the shaft tube portion. The front fork includes: a main frame, which is provided with a connecting portion for pivoting on the shaft tube portion, the connecting portion is connected to the handle portion; at least one side frame is disposed on one side of the main frame, each of The side frame includes a pivoting portion connected to the flower hub, a front portion and a rear portion. The front portion and the rear portion are respectively disposed on opposite sides of the pivoting portion, and the front portion and the rear portion are respectively connected to the main frame Each side frame and the main frame enclosure are provided with a receiving space for the wheel body. The invention further relates to a bicycle frame set comprising the aforementioned front fork.

Description

Front fork and bicycle frame set including the front fork

The present invention relates to a front fork and a bicycle frame set including the front fork.

The bicycle front fork structure of the prior art is TWI565619, which includes: a standpipe pivotable on a shaft tube portion of a frame; and a U-shaped tube having a first arm and a second arm And a bent portion, wherein the two ends of the curved portion are respectively connected to the first arm portion and the second arm portion, and the first and second arm portions are respectively connected to two sides of the hub of the wheel.

However, the first arm portion and the second arm portion of the bicycle front fork structure of the prior art extend in a direction slightly parallel to the height direction of the frame, so that the windward area of the first arm portion and the second arm portion is large, resulting in a large windward area. The wind resistance generated during the riding process is large, and it is more laborious to ride. In addition, since the direction of the airflow coming in front of the ride is opposite to the direction of the airflow generated by the rotation of the wheel body, the airflow generated by the extreme pressure generated between the first and second arms and the wheel body is large.

Therefore, it is necessary to provide a novel and progressive front fork to solve the above problems.

The main object of the present invention is to provide a front fork which can reduce wind resistance.

In order to achieve the above object, the present invention provides a front fork for pivoting to a shaft tube portion of a bicycle frame, and is coupled to a flower hub on a wheel body and a handle portion transverse to the shaft tube portion. The front fork includes: a main frame, a connecting portion for pivoting on the shaft tube portion, the connecting portion is connected to the handle portion; at least one side frame, the at least one side is mounted on the main frame One side of each of the side frames includes a pivoting portion for connecting to the flower hub, a front portion and a rear portion. The front portion and the rear portion are respectively disposed on opposite sides of the pivoting portion, and the front portion and the rear portion are respectively connected In the main frame, each of the side frames and the main frame enclosing a receiving space for receiving the wheel body; wherein the main frame is provided with a front side and a rear side, and each of the side frames is connected to the main body The front side of the frame is connected to the rear side of the main frame, and the front and rear sections of the side frame and the pivoting portion are disposed on a radial direction, and the front side is oriented at least toward the radial direction of the front side. The rear section extends from the rear section toward the front section toward at least one side of the radial direction.

In order to achieve the above object, the present invention further provides a bicycle frame set including the foregoing front fork, the bicycle frame set comprising: a bicycle frame, a shaft tube portion and at least one wind guiding side disposed on one side of the bicycle frame, The bicycle frame defines a second direction passing through a front side and a rear side; the connecting portion of the front fork is pivoted to the shaft tube portion, and the side frames are respectively oriented in the second direction and each of the wind guiding sides The second direction extends, and each of the side frames corresponds to a position of one of the wind guiding sides.

1‧‧‧ front fork

10‧‧‧ main frame

11‧‧‧Connecting Department

12‧‧‧ accommodating space

8, 13‧‧‧ front side

9, 14‧‧‧ back side

15‧‧‧ front end

16‧‧‧End end

17‧‧‧ 挡

20‧‧‧Side frame

21‧‧‧ pivotal department

22‧‧‧Inlet

23‧‧‧ front section

24‧‧‧After

2‧‧‧Bicycle rack

3‧‧‧ shaft tube department

4‧‧‧ wheel body

5‧‧‧Flower hub

6‧‧‧Hands

7‧‧‧wind side

L1‧‧‧ first direction

1 is a perspective view of a preferred embodiment of the present invention.

2 is a perspective view of a bicycle frame mounted in accordance with a preferred embodiment of the present invention.

3 is a side elevational view of a bicycle frame mounted in accordance with a preferred embodiment of the present invention.

Figure 4 is a schematic view of the wind of Figure 3 flowing through the front side.

Figure 5 is a cross-sectional view of the front fork of a preferred embodiment of the present invention.

Figure 6 is a cross-sectional view of a bicycle frame mounted in accordance with a preferred embodiment of the present invention.

Figure 7 is a schematic illustration of the flow of wind through the front fork in accordance with a preferred embodiment of the present invention.

Figure 8 is a diagram showing the relationship between the viewing angle and the frequency according to a preferred embodiment of the present invention.

Figure 9 is a schematic view of the wind of Figure 5 flowing through the rear side.

The following is a description of the possible embodiments of the present invention, and is not intended to limit the scope of the invention as claimed.

Referring to FIGS. 1 through 8, there is shown a preferred embodiment of the present invention. The front fork 1 of the present invention is pivotable to a shaft tube portion 3 of a bicycle frame 2 and is coupled to a hub of a wheel body 4. 5 and a handle portion 6 transversely connected to the shaft tube portion 3, the front fork 1 comprising: a main frame 10 and at least one side frame 20.

The main frame 10 is provided with a connecting portion 11 pivotally disposed on the shaft tube portion 3, and the connecting portion 11 is connected to the handle portion 6; the at least one side frame 20 is disposed on one side of the main frame 10, Each of the side frames 20 includes a pivoting portion 21 connected to the hub 5, a front portion 23 and a rear portion 24. The front portion 23 and the rear portion 24 are respectively disposed on opposite sides of the pivoting portion 21 and the front portion 23 and the rear section 24 are respectively connected to the main frame 10, and each of the side frames 20 and the main frame 10 enclose a receiving space 12 for receiving the wheel body 4, so that the area of the windward surface is small and can effectively block Oncoming winds to reduce wind resistance. Referring to Figure 8, most of the apparent wind has an angle of less than 5 degrees when riding.

In this embodiment, the number of the at least one side frame 20 is two, and the two side frames 20 are respectively disposed on opposite sides of the main frame 10.

In the present embodiment, the main frame 10 has a partial ring shape, such as a U shape. The main frame 10 is provided with a front side 13 and a rear side 14. The front and rear sides 13 and 14 of the main frame 10 are respectively disposed in a first direction L1. The main frame 10 is provided with the flower in the first direction L1. The hubs 5 overlap to block the wind resistance that comes to the flower hub 5. The front section 23 of each of the side frames 20 is connected to the front side 13 of the main frame 10, and the rear section 24 of each of the side frames 20 is connected to the rear side 14 of the main frame 10. In this embodiment, each of the side frames 20 extends along the first direction L1 to provide a smaller area of the windward side to reduce the wind resistance. In other embodiments, each of the side frames may have a plurality of arm portions that are connected to each other and are not arranged in parallel, for example, in a V shape, or may be non-linearly extended. In addition, the main frame 10 is provided with a front end 15 and a rear end 16. The front and rear ends 15 and 16 do not exceed the side frames 20 in the circumferential direction, and the thickness of the main frame 10 on the front side 13 is In the first direction, the wind is gradually expanded from the outside to the inside, and the wind flow can also be discharged to the side frames 20 on both sides to reduce the wind resistance. In detail, the main frame 10 will wrap the wheel body 4, and even in the cross section of the rear side 14, the overall shape can be perfected, and the air can be smoothly guided to reduce turbulence and resistance, as shown in FIG. Shown. The front section 23, the rear section 24 and the pivoting portion 21 of each of the side frames 20 are disposed in a radial direction, and the front side 13 extends from the front section 23 toward at least one side of the radial direction toward the rear section 24, the rear side 14 being at least by the rear section 24 extends toward the front section 23 towards at least one side of the radial direction.

Preferably, the spacing between the outer sides of the two side frames 20 is gradually expanded from the front side 13 of the main frame 10 toward the pivoting portion 21; specifically, in a plan view, such as FIGS. 5 and 7, the main frame The cross section of the 10th side frame 20 is slightly water-dropped, which effectively reduces the wind resistance. As shown in Fig. 7, a point chain is a schematic representation of the fluid, indicating that the two side frames 20 can direct fluid flow smoothly from the outside of the hub 5 to reduce windage.

Each of the side frames 20 extends through a flow guiding hole 22 in a thickness direction; in detail, the flow guiding holes 22 of each of the side frames 20 are open toward the rear side 14 of the main frame 10. In the embodiment, the air guiding hole 22 is disposed on the rear side 14 of the main frame 10, and the air guiding hole 22 extends in the first direction L1. The guiding hole 22 is formed by the main frame 10 The front side 13 is gradually expanded toward the rear side 14, so that air can be guided to flow without accumulating between the two side frames 20 and the wheel body 4 to reduce the wind resistance.

In addition, the main frame 10 further includes a blocking portion 17 that at least partially overlaps the connecting portion 11 in the first direction L1. The blocking portion 17 is closer to the front side 13 of the main frame 10 than the connecting portion 11 To guide the wind to the opposite sides of the main frame 10. Preferably, the distance between the opposite outer sides of the blocking portion 17 is gradually expanded from the front side 13 to the rear side 14, and the wind resistance can be reduced. In the embodiment, the connecting portion 11 is a rod body, and the extending direction of the connecting portion 11 is transverse to the first direction L1.

The present invention further provides a bicycle frame set including the front fork 1 as described above, and the bicycle frame 2, the bicycle frame 2 is provided with the shaft tube portion 3 and at least one wind guiding side disposed on one side In the present embodiment, the number of the at least one air guiding side portion 7 is two, and the bicycle frame 2 defines a second direction passing through a front side 8 and a rear side 9, wherein the second direction is parallel to the first a direction L1; the connecting portion 11 of the front fork 1 is pivoted to the shaft tube portion 3, and each of the side frames 20 and each of the wind guiding side portions 7 respectively extend in the second direction, and the side frames 20 are respectively The two directions correspond to the position of one of the wind guiding side portions 7, whereby the front fork 1 is matched with the design of the bicycle frame 2, and the whole is similar to a one-piece design to reduce the area of the overall leading edge (the leading edge is integral) Towards the end face of the front side 8 of the bicycle frame 2; as shown in Fig. 6, the arrow of the chain line indicates the flow direction of the wind, allowing air to follow the side frame 20 of the front fork 1 to each of the wind guiding side portions 7 to allow air The flow is smoother and the wind resistance is reduced; in detail, the front fork 1 is designed to cover the wheel body 4 located at the front, and the cross section of the front fork 1 is a fluid force The best shape "water drop", FIG. 7, the front fork 1 so that only a 5% resistance. Preferably, each of the air guiding side portions 7 is located at an outermost point of the at least one side frame 20; in the embodiment, the two air guiding side portions 7 are respectively located at the outermost points of the two side frames 20. In the meantime, air can be led along the two side frames 20 to the two air guiding side portions 7, so that the air flow is smoother to reduce the wind resistance.

In use, the handle portion 6 is rotatable relative to the bicycle frame 2 to drive the front fork 1 and the wheel body 4 to operate.

In summary, the front fork of the present invention and the bicycle frame set including the front fork can block the wind resistance of the wheel body with a simple structure, and the design of the main frame and the side frames can be used to reduce the overall area of the windward side. Effectively reduce wind resistance and improve ride smoothness. In addition, the design of the front fork and the bicycle frame can also enhance the air guiding effect and reduce the wind resistance.

Claims (10)

a front fork for pivoting to a shaft tube portion of a bicycle frame, and connected to a flower hub on a wheel body and a handle portion transverse to the shaft tube portion, the front fork comprising: a main frame a connecting portion for pivoting to the shaft tube portion, the connecting portion for connecting to the handle portion; at least one side frame, the at least one side being mounted on one side of the main frame, each of the side frames including a And a front section and a rear section respectively disposed on opposite sides of the pivoting portion, and the front section and the rear section are respectively connected to the main frame, each of the side frames And the main frame enclosure is provided with a receiving space for the wheel body; wherein the main frame is provided with a front side and a rear side, and the front side of each side frame is connected to the front side of the main frame, after each side frame The rear side is connected to the rear side of the main frame, and the front and rear sections of the side frame and the pivoting portion are disposed in a radial direction, and the front side is extended from the front side toward the rear side by at least one side of the radial direction, and the rear side is the rear side At least one side of the radial direction extends toward the front section. The front fork according to claim 1, wherein the number of the at least one side frame is two, and the two side frames are respectively disposed on opposite sides of the main frame, and the spacing between the outer sides of the two side frames is preceded by the main frame. The side is gradually enlarged toward the pivotal portion. The front fork according to claim 1, wherein each of the side frames penetrates a flow guiding hole in a thickness direction. The front fork according to claim 3, wherein the guide holes of each of the side frames are open toward a rear side of one of the main frames. The front fork according to claim 1, wherein the main frame is provided with a front end and a rear end, and the front and rear ends do not exceed each of the side frames in a circumferential direction. The front fork according to claim 1, wherein the main frame is provided with a blocking portion, the front and rear sides of the main frame are respectively disposed in a first direction, and the blocking portion and the connecting portion are at least partially in the first direction. Overlap, the blocking portion is closer to the front side of the main frame than the connecting portion. The front fork according to claim 6, wherein a distance between opposite outer sides of the blocking portion is gradually expanded from the front side to the rear side. The front fork according to claim 7, wherein the number of the at least one side frame is two, and the two side frames are respectively disposed on opposite sides of the main frame; the main frame has a part of a ring shape, and the two side frames are outside The spacing between the front frame and the front side of the main frame is gradually expanded; the side frame of each of the side frames is open to a rear side of the main frame; The guiding hole is disposed at a rear side of the main frame; the guiding hole extends in the first direction, and the guiding hole is gradually expanded from a front side of the main frame to the rear side; the main frame is provided with a front end and a rear end, the front and rear ends do not exceed each of the side frames in a single direction; the thickness of the main frame on the front side is gradually expanded from the outer side to the inner side in the first direction; the connecting portion is a rod body, The extending direction of the connecting portion is transverse to the first direction; the main frame is disposed in the first direction to overlap the flower hub. A bicycle rack set comprising the front fork according to any one of claims 1 to 8, the bicycle rack set further comprising: a bicycle frame, a shaft tube portion and at least one wind guiding side disposed on one side The bicycle frame defines a second direction passing through a front side and a rear side; the connecting portion of the front fork is pivoted to the shaft tube portion, and each of the side frames and each of the air guiding side portions respectively extend toward the second direction The at least one side of the frame corresponds to the position of the at least one air guiding side in the second direction. The bicycle frame set of claim 9, wherein each of the air guiding side portions is located at an outermost point of the at least one side frame.