Electric bicycle front fork

Abstract

The utility model relates to electric bicycle technical field especially relates to a kind of electric bicycle front fork, including main rod, two main rods are vertically arranged, oil cavity is set in the inside of main rod, hydraulic oil is filled in oil cavity, the through-hole that is communicated with oil cavity is set in the top of main rod, the oil cavity in the inside of two main rods is all provided with damping assembly, the stroke rod that extends into oil cavity is movably inserted in the through-hole of the top of two main rods, the bottom of two stroke rods is all connected with link rod, piston is installed in the bottom of two link rods, and the top of piston is circular array type and is provided with multiple oil holes that pass through up and down, two pistons are connected with the damping assembly in two oil cavities respectively, the top of two main rods is installed with protection assembly, fork shoulder is fixedly installed in the top of two stroke rods, the utility model is designed by optimizing oil passage and accurate plugging piece etc., solve traditional front fork slow rebound problem, improve riding stability and comfort, prolong service life.

Description

Technical Field

[0001] This utility model relates to the field of electric bicycle technology, and in particular to an electric bicycle front fork. Background Technology

[0002] In the field of electric bicycle technology, the front fork, as a key load-bearing and shock-absorbing component connecting the front wheel and the frame, directly determines the continuity and comfort of riding on bumpy roads. When an electric bicycle travels over speed bumps, potholes, or other uneven surfaces, the front fork needs to absorb the impact and rebound quickly and smoothly to ensure that the front wheel always keeps in contact with the ground and maintains riding stability.

[0003] Existing electric bicycle front forks have significant design flaws in their rebound performance, generally suffering from slow rebound speed. The rebound power of traditional front forks mainly relies on a single spring structure. However, the elastic recovery coefficient of such springs is fixed and they are not designed to be coordinated with the hydraulic damping system. In practical applications, the hydraulic fluid needs to return through the piston oil hole to achieve rebound. However, the hydraulic fluid flow path of existing front forks only relies on the fixed oil hole on the piston, without a targeted rebound acceleration guide structure. The hydraulic fluid return resistance is large, which causes the elastic recovery force of the spring to be excessively offset, resulting in a slow rebound speed. In view of this, this application proposes an electric bicycle front fork. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an electric bicycle front fork to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an electric bicycle front fork, comprising:

[0006] The main rod has two vertically arranged main rods. The main rods have oil chambers inside, which are filled with hydraulic oil. A through hole communicating with the oil chambers is opened at the top of the main rods.

[0007] The shock absorption assembly consists of two sets, each placed in an oil cavity inside one of the two main rods.

[0008] There are two stroke rods, which pass through the through holes at the top of the two main rods and extend into the oil chamber. The bottom of each stroke rod is connected to a connecting rod.

[0009] Two pistons are provided and fixedly installed at the bottom of two connecting rods respectively. The top of the pistons has multiple oil holes that run vertically through the top and bottom in a circular array. The two pistons are respectively connected to the shock-absorbing components in the two oil chambers.

[0010] The protective components are provided in two sets and are installed at the top of the two main poles respectively;

[0011] The fork shoulder is fixedly installed at the top of the two travel rods.

[0012] Optionally, the protective assembly includes a protective tube, a main spring, and a limiting plate. The protective tube is fixedly installed on the top of the main rod and sleeved on the outside of the stroke rod. Slots are provided on both sides of the protective tube. The limiting plate is fixedly sleeved on the stroke rod and is located inside the protective tube. The shape of the limiting plate matches the shape inside the protective tube. The main spring is located inside the protective tube and sleeved on the stroke rod, and its two ends are respectively connected to the top of the main rod and the bottom of the limiting plate.

[0013] Optionally, the main rod has multiple channels arranged in a circular array around the oil chamber on its side wall. The opening at the top of the channel is located on the upper part of the inner wall of the oil chamber and above the piston, while the opening at the bottom of the channel is arranged in a circular array at the bottom of the oil chamber.

[0014] Optionally, the damping assembly includes a mounting bracket, a first spring, a second spring, and a sealing member. The mounting bracket is fixedly installed in a cross shape at a lower position inside the oil chamber, and the mounting bracket is located below the piston. The first spring is fixedly connected between the piston and the mounting bracket. The sealing member is disposed inside the oil chamber and located below the mounting bracket. The second spring is fixedly connected between the sealing member and the mounting bracket. The outer diameter of the sealing member is smaller than the diameter of the oil chamber, and the sealing member can be inserted into the opening at the bottom of multiple channels.

[0015] Optionally, the sealing component includes a ring body, a sealing plug, and a limiting rod. The ring body is fixedly connected to the bottom end of the second spring. The number of sealing plugs is the same as the number of channels, and multiple sealing plugs are distributed in a circular array at the bottom of the ring body. The sealing plug is set in a frustum shape, and the opening at the bottom end of the channel is set in a funnel shape that matches the shape of the sealing plug. The limiting rod is horizontally fixed between the inner walls of the ring body.

[0016] Optionally, a limiting post is fixedly installed at the center of the bottom of the oil chamber, and a limiting groove that runs through the left and right sides is opened on the side wall of the limiting post. The limiting rod in the sealing component is inserted through the limiting groove on the side wall of the limiting post.

[0017] Optionally, a fork bridge is fixedly installed between the top ends of the outer walls of the two main rods, and an annular groove is opened on the inner wall of the through hole at the top ends of the two main rods. An oil seal sleeved on the corresponding stroke rod is fixedly installed in each of the two annular grooves.

[0018] The beneficial effects of this utility model are:

[0019] The circular array of channels on the sidewall of the main rod surrounding the oil chamber, combined with the multi-hole design on the top of the piston, creates a dual oil flow path of "piston oil hole + sidewall channel". During the rebound process, the oil can not only flow back through the original oil hole of the piston, but also flow quickly from the bottom of the oil chamber to the top of the piston through the sidewall channel, which greatly reduces the oil return resistance and avoids the spring elastic restoring force being excessively offset, so that the fork can respond quickly to the rebound action after absorbing the impact.

[0020] The shock absorption assembly achieves dynamic power adjustment through the linkage design of the sealing component and the channel. In the compression state, the sealing component blocks the bottom opening of the channel under pressure, and the oil mainly flows slowly through the piston oil hole to ensure the shock absorption and buffering effect. In the rebound state, the second spring pulls back the sealing component to disengage it from the channel opening, and the channel and piston oil hole are synchronously connected, allowing the oil to flow back quickly in both directions. Combined with the elastic restoring force of the main spring and the first spring, it solves the problem of the fixed elastic coefficient and insufficient rebound power of the traditional single spring, making the rebound speed and force more adaptable to road conditions with different degrees of bumps. Attached Figure Description

[0021] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is an exploded view of the present invention;

[0024] Figure 3 This is a schematic diagram of the connection between the stroke rod, the main rod, and the protective component of this utility model;

[0025] Figure 4 This is a cross-sectional structural diagram of the connection between the stroke rod, the main rod, and the protective component of this utility model;

[0026] Figure 5 This is a schematic cross-sectional view of the connection between the main rod and the shock-absorbing component of this utility model.

[0027] Figure 6 This is a schematic diagram of the structure of the protective tube of this utility model;

[0028] Figure 7 This is a cross-sectional structural diagram of the connection between the main rod and the sealing component of this utility model;

[0029] Figure 8 This is an enlarged structural diagram of point A in this utility model;

[0030] In the picture:

[0031] 1. Main rod; 2. Travel rod; 3. Fork shoulder; 4. Protective tube; 5. Main spring;

[0032] 11. Fork bridge; 12. Oil cavity; 13. Through hole; 14. Channel; 15. Annular groove; 16. Oil seal;

[0033] 21. Connecting rod; 22. Piston; 23. Limiting plate;

[0034] 61. Fixing frame; 62. First spring; 63. Second spring; 64. Sealing component; 65. Limiting post; 641. Ring body; 642. Sealing plug; 643. Limiting rod. Detailed Implementation

[0035] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0036] Please see Figures 1-8 This utility model provides a technical solution: an electric bicycle front fork, including two main rods 1 arranged vertically. Each main rod 1 has an oil cavity 12 filled with hydraulic oil. A through hole 13 communicating with the oil cavity 12 is provided at the top of each main rod 1. Shock-absorbing components are installed in the oil cavities 12 of both main rods 1. A stroke rod 2 extending into the oil cavity 12 is movably inserted into the through hole 13 at the top of each main rod 1. A connecting rod 21 is connected to the bottom of each stroke rod 2. A piston 22 is installed at the bottom of each connecting rod 21, and the top of each piston 22 has multiple vertically penetrating oil holes arranged in a circular array. 2 are connected to the shock-absorbing components in the two oil chambers 12 respectively. The top of each of the two main rods 1 is equipped with a protective component. The top of each of the two stroke rods 2 is fixedly installed with a fork shoulder 3. By setting two vertical main rods 1 with oil chambers 12 and through holes 13, together with two sets of shock-absorbing components, stroke rods 2 that pass through the through holes 13 and are inserted into the oil chambers 12, as well as protective components and fork shoulders 3, a complete and symmetrical structural system is formed. This design not only ensures the core functions of the front fork in bearing load and connecting the front wheel and the frame, but also ensures the balance of force through the symmetrical layout on both sides. At the same time, it allows the stroke rods 2, pistons 22 and shock-absorbing components to form a linkage, providing a stable structural foundation for subsequent shock absorption and rebound performance optimization.

[0037] like Figure 3 , Figure 4 and Figure 6As shown, the protective assembly includes a protective tube 4, a main spring 5, and a limiting plate 23. The protective tube 4 is fixedly installed on the top of the main rod 1 and sleeved on the outside of the stroke rod 2. Slots are provided on both sides of the protective tube 4. The limiting plate 23 is fixedly sleeved on the stroke rod 2 and is located inside the protective tube 4. The shape of the limiting plate 23 is adapted to the shape inside the protective tube 4. The main spring 5 is located inside the protective tube 4 and sleeved on the stroke rod 2. The two ends of the main spring 5 are respectively connected to the top of the main rod 1 and the bottom of the limiting plate 23. The protective tube 4 sleeved on the outside of the stroke rod 2 can prevent impurities from entering the interior of the main rod 1, protecting the oil chamber 12 and the shock absorption assembly. The main spring 5 can cooperate with the shock absorption assembly inside the oil chamber 12 to form double shock absorption, improving the buffering effect under bumpy road conditions. The limiting plate 23 is adapted to the shape inside the protective tube 4, which can limit the lateral displacement of the stroke rod 2 and ensure its vertical and stable movement. The slots on both sides of the protective tube 4 facilitate observation of the internal components and reduce maintenance difficulty.

[0038] like Figure 1 and Figure 2 As shown, the main rod 1 has multiple channels 14 arranged in a circular array around the oil cavity 12 on its side wall. The opening at the top of the channel 14 is located at the upper part of the inner wall of the oil cavity 12 and above the piston 22. The opening at the bottom of the channel 14 is arranged in a circular array at the bottom of the oil cavity 12. By opening the circular array of channels 14 around the oil cavity 12 on the side wall of the main rod 1, an auxiliary flow path for the oil is constructed, which improves the rebound speed. At the same time, the uniform distribution of multiple channels 14 can make the oil flow more uniform, avoid local high-pressure wear on the inner wall of the main rod 1, ensure stable pressure changes of the piston 22, and improve the smoothness of shock absorption and rebound.

[0039] like Figure 4 and Figure 5 As shown, the shock absorption assembly includes a mounting bracket 61, a first spring 62, a second spring 63, and a sealing member 64. The mounting bracket 61 is fixedly installed in a cross shape at a lower position inside the oil cavity 12, and the mounting bracket 61 is located below the piston 22. The first spring 62 is fixedly connected between the piston 22 and the mounting bracket 61. The sealing member 64 is disposed inside the oil cavity 12 and located below the mounting bracket 61. The second spring 63 is fixedly connected between the sealing member 64 and the mounting bracket 61. The outer diameter of the sealing member 64 is smaller than the diameter of the oil cavity 12, and the sealing member 64 can be inserted into the opening at the bottom of multiple channels 14. The sealing member 64 in the shock absorption assembly can change the flow of the channels 14, thereby realizing flexible adjustment of the rebound speed to meet the rebound requirements in different scenarios. The mounting bracket 61 can stably support the first spring 62 and the second spring 63 to prevent positional displacement, and can also provide a lower limit for the piston 22.

[0040] like Figure 4 , Figure 5 and Figure 7As shown, the sealing component 64 includes a ring 641, a sealing plug 642, and a limiting rod 643. The ring 641 is fixedly connected to the bottom end of the second spring 63. The number of sealing plugs 642 is the same as the number of channels 14, and multiple sealing plugs 642 are distributed in a circular array at the bottom of the ring 641. The sealing plugs 642 are set in a frustum shape. The opening at the bottom end of the channel 14 is set in a funnel shape that matches the shape of the sealing plugs 642. The limiting rod 643 is fixedly installed horizontally between the inner walls of the ring 641. The frustum-shaped sealing plugs 642 are adapted to the opening at the bottom end of the funnel-shaped channel 14. When they are in contact, the sealing effect is good and the oil flow can be precisely controlled. When they are detached from the opening at the bottom end of the channel 14, the oil backflow is not affected. The limiting rod 643 cooperates with the limiting post 65 to restrict the sealing component 64 to move only in the vertical direction, ensuring that the sealing plugs 642 are precisely aligned with the opening at the bottom end of the channel 14.

[0041] like Figure 5 , Figure 7 and Figure 8 As shown, a limiting post 65 is fixedly installed at the center of the bottom of the oil cavity 12. A limiting groove that runs through the left and right sides is opened on the side wall of the limiting post 65. The limiting rod 643 in the sealing component 64 is inserted through the limiting groove on the side wall of the limiting post 65. Through the cooperation of the limiting post 65 and the limiting rod 643, a rigid directional constraint is formed, which accurately locks the movement trajectory of the sealing component 64, completely eliminates the risk of its deviation, ensures the alignment accuracy of the sealing plug 642 and the opening of the channel 14, and ensures the stability of the oil flow regulation function.

[0042] like Figure 1 , Figure 4 and Figure 5 As shown, a fork bridge 11 is fixedly installed between the top ends of the outer walls of the two main rods 1. An annular groove 15 is provided on the inner wall of the through hole 13 at the top ends of the two main rods 1. An oil seal 16 is fixedly installed in each of the two annular grooves 15 and sleeved on the corresponding stroke rod 2. The oil seal 16 can form a tight seal between the stroke rod 2 and the through hole 13 to prevent oil leakage and external impurities from entering the oil cavity 12, protect the internal components and oil quality, and avoid a decrease in shock absorption performance.

[0043] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A front fork for an electric bicycle, characterized in that, include: The main rod (1) has two parts and is in a vertical position. The main rod (1) has an oil cavity (12) inside, which is filled with hydraulic oil. A through hole (13) communicating with the oil cavity (12) is provided at the top of the main rod (1). The shock absorption assembly is provided with two sets and is placed in the oil chambers (12) inside the two main rods (1); There are two stroke rods (2). The two stroke rods (2) pass through the through holes (13) at the top of the two main rods (1) and extend into the oil cavity (12). The bottom ends of the two stroke rods (2) are connected to connecting rods (21). Pistons (22) are provided in two and are fixedly installed at the bottom of two connecting rods (21). The top of the pistons (22) is provided with multiple oil holes that run vertically through the top and bottom in a circular array. The two pistons (22) are respectively connected to the shock-absorbing components in the two oil chambers (12). The protective components are provided in two sets and are respectively installed at the top of the two main rods (1); The fork shoulder (3) is fixedly installed at the top of the two stroke rods (2).

2. The electric bicycle front fork according to claim 1, characterized in that, The protective assembly includes a protective tube (4), a main spring (5), and a limiting plate (23). The protective tube (4) is fixedly installed on the top of the main rod (1) and sleeved on the outside of the stroke rod (2). Slots are provided on both sides of the protective tube (4). The limiting plate (23) is fixedly sleeved on the stroke rod (2) and is located inside the protective tube (4). The shape of the limiting plate (23) is adapted to the shape inside the protective tube (4). The main spring (5) is located inside the protective tube (4) and sleeved on the stroke rod (2). The two ends of the main spring (5) are respectively connected to the top of the main rod (1) and the bottom of the limiting plate (23).

3. The electric bicycle front fork according to claim 1, characterized in that, The main rod (1) has multiple channels (14) arranged in a circular array around the oil cavity (12) on its side wall. The opening at the top of the channel (14) is located on the upper part of the inner wall of the oil cavity (12) and above the piston (22). The opening at the bottom of the channel (14) is arranged in a circular array at the bottom of the oil cavity (12).

4. The electric bicycle front fork according to claim 3, characterized in that, The shock absorption assembly includes a fixing frame (61), a first spring (62), a second spring (63), and a sealing member (64). The fixing frame (61) is fixedly installed in a cross shape at a lower position inside the oil cavity (12) and is located below the piston (22). The first spring (62) is fixedly connected between the piston (22) and the fixing frame (61). The sealing member (64) is disposed inside the oil cavity (12) and located below the fixing frame (61). The second spring (63) is fixedly connected between the sealing member (64) and the fixing frame (61). The outer diameter of the sealing member (64) is smaller than the diameter of the oil cavity (12), and the sealing member (64) can be inserted into the opening at the bottom of multiple channels (14).

5. The electric bicycle front fork according to claim 4, characterized in that, The sealing component (64) includes a ring (641), a sealing plug (642), and a limiting rod (643). The ring (641) is fixedly connected to the bottom end of the second spring (63). The number of sealing plugs (642) is the same as the number of channels (14), and multiple sealing plugs (642) are distributed in a circular array at the bottom of the ring (641). The sealing plugs (642) are set in a frustum shape. The opening at the bottom end of the channel (14) is set in a funnel shape that matches the shape of the sealing plugs (642). The limiting rod (643) is horizontally fixed between the inner walls of the ring (641).

6. The electric bicycle front fork according to claim 5, characterized in that, A limiting post (65) is fixedly installed at the center of the bottom of the oil cavity (12). A limiting groove that runs through the left and right sides is opened on the side wall of the limiting post (65). The limiting rod (643) in the sealing member (64) is inserted through the limiting groove on the side wall of the limiting post (65).

7. The electric bicycle front fork according to claim 5, characterized in that, A fork bridge (11) is fixedly installed between the top ends of the outer walls of the two main rods (1). An annular groove (15) is provided on the inner wall of the through hole (13) at the top ends of the two main rods (1). An oil seal (16) sleeved on the corresponding stroke rod (2) is fixedly installed in the two annular grooves (15).

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