A front fork crown tube for a bicycle

Abstract

The utility model relates to a bicycle technical field especially relates to a front fork head pipe for bicycle, including shoulder fork, shoulder fork is inverted V shape, the top of shoulder fork fixedly installed has connecting column, is seted up first screw groove at the top of connecting column, the top of connecting column is provided with main pipe, the main pipe bottom fixedly installed has the screw rod of screw joint in first screw groove, the inner wall both sides of main pipe all are seted up a plurality of equidistance distribution's limit card slot, the movable plug -in of main pipe has inner rod, is provided with the limit assembly in inner rod, and limit assembly can with the limit card slot of main pipe inner wall both sides is clamped, and inner rod top is provided with the top rod, and the bottom of top rod is seted up screw groove, the utility model discloses through the mutual cooperation of main pipe, inner rod and limit assembly, can the overall length of front fork head pipe be adjusted flexibly, and can to the structure of adjusted carry out double locking, effectively avoided the loosening of vibration during the riding process, improved the riding safety and experience.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and in particular to a bicycle fork head tube. Background Technology

[0002] The head tube of a bicycle fork is a key component of the bicycle fork. It is mainly used to connect the fork and handlebars, and is an important component to ensure the structural stability and functionality of the fork. Its structural stability and ease of adjustment directly affect the safety and comfort of riding.

[0003] However, in the existing technology, the head tube structure of traditional bicycle forks still has obvious shortcomings: common adjustable fork head tubes are not only complex in adjustment structure, but also mostly rely on a single thread structure. After long-term use, the thread fit is prone to loosening due to continuous vibration, affecting the overall structural stability. At the same time, the locking reliability after adjustment is not good. During riding, it is easy to loosen due to vibration, which will produce abnormal noise or shaking, which not only reduces the riding experience, but also poses a safety hazard. Therefore, this application proposes a bicycle fork head tube. Utility Model Content

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

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

[0006] The shoulder fork forms an inverted V-shape;

[0007] A connecting post is vertically installed on the top of the shoulder fork, and a first threaded groove is provided on the top of the connecting post;

[0008] The main tube has a threaded rod fixedly installed at the bottom end, which is threaded into the first threaded groove. Multiple equidistant limiting slots are opened on both sides of the inner wall of the main tube.

[0009] The inner rod is movably inserted into the main pipe;

[0010] The limiting component is located in the inner rod and can engage with the limiting slots on both sides of the inner wall of the main tube;

[0011] The top rod has a threaded groove at its bottom, and the threaded groove at the bottom of the top rod can be threaded onto the top of the inner rod.

[0012] Optionally, a square groove is provided at the bottom of the inner rod, and an opening communicating with the groove is provided at the lower position of both ends of the inner rod. A fixed shaft is fixedly installed in both openings. A first groove is provided at the top of the inner rod, and a second groove communicating with the groove is provided at the bottom of the first groove.

[0013] The limiting assembly includes two limiting blocks, a plug rod, a limiting rod, and a spring. The limiting blocks have a teardrop-shaped cross-section. The tops of the two limiting blocks are rotatably sleeved on two fixed shafts, and the outer sides of the two limiting blocks can extend out and engage with the limiting slots. The plug rod is movably inserted into the rod slot and presses against the inner side of the limiting blocks. The limiting rod is fixedly installed on the top of the plug rod and located in the first groove. The spring is located in the second groove and sleeved on the outside of the plug rod.

[0014] Optionally, the diameter of the first groove is larger than the diameter of the second groove, and the size of the first groove is adapted to the size of the limiting rod. The two ends of the spring are fixedly connected to the bottom end of the second groove and the bottom end of the limiting rod, respectively. When the limiting rod is located in the first groove, the spring is in a compressed state, and the bottom end of the insertion rod is located between the two limiting blocks.

[0015] Optionally, a second threaded groove is provided on both sides of the limiting rod, and a through hole communicating with the first groove is provided at the upper position on both sides of the inner rod. A countersunk hole communicating with the threaded groove is provided on both sides of the top rod. A locking bolt is inserted into each of the two countersunk holes. The two locking bolts pass through the corresponding countersunk hole and through hole and are threaded into the second threaded groove on both sides of the limiting rod.

[0016] Optionally, four lower positioning blocks are installed in a circular array at the upper position of the connecting column sidewall, and four upper positioning blocks are installed in a circular array at the lower position of the main pipe sidewall. The upper positioning blocks are the same size as the lower positioning blocks. A movable collar is fitted on the main pipe. The side of the collar has four slots extending to its bottom in a circular array. The four slots on the sidewall of the collar are respectively fitted onto the outside of the corresponding upper and lower positioning blocks. A threaded cap is threaded on the main pipe, and the threaded cap can be fitted onto the outside of the collar.

[0017] Optionally, each upper and lower positioning block is provided with a vertically penetrating positioning hole, and the top of the inner wall of each of the four slots is fixedly connected with a vertical positioning rod, and the four positioning rods are respectively inserted into the positioning holes on the corresponding upper and lower positioning blocks.

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

[0019] By engaging the inner rod with the main tube, and combining the engagement structure of the teardrop-shaped limiting block in the limiting component with the limiting groove on the inner wall of the main tube, the overall length of the fork head tube can be flexibly adjusted to meet the needs of different riders' heights, riding habits, or road conditions, thus solving the problems of complex structure and inconvenient adjustment of traditional adjustable head tubes.

[0020] When the top rod is threaded onto the top of the inner rod, it continuously applies pressure to the limiting rod and insert rod in the limiting assembly. The insertion rod squeezes the limiting block, causing the limiting block to engage tightly with the slot. Combined with the threaded connection between the locking bolts on both sides of the top rod through the through hole and the second threaded groove of the limiting rod, a double locking is achieved after adjustment. This effectively prevents loosening caused by vibration during riding, reduces abnormal noise and shaking, and improves riding safety and experience.

[0021] Based on the threaded connection between the connecting post and the main tube via the screw and the first threaded groove, an upper and lower positioning block in a circular array are added. Together with the wrapping of the collar groove and the through insertion of the positioning rod into the positioning hole, a multi-directional positioning and limiting structure is formed. Furthermore, the connection stability between the connecting post and the main tube is further enhanced by fixing the collar with the threaded cap. This solves the problem of loosening due to vibration after long-term use of the traditional single thread structure and ensures the overall structural strength of the fork head tube. Attached Figure Description

[0022] 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:

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is an exploded view of the present invention;

[0025] Figure 3 This is a cross-sectional structural diagram showing the connection between the main tube, inner rod, and limiting assembly of this utility model.

[0026] Figure 4 This is an enlarged structural diagram of point A in this utility model;

[0027] Figure 5 This is a cross-sectional structural diagram of the inner rod and limiting component of this utility model;

[0028] In the picture:

[0029] 1. Shoulder fork; 2. Connecting column; 3. Main tube; 4. Inner rod; 6. Top rod; 7. Locking bolt;

[0030] 21. First threaded groove; 22. Lower positioning block;

[0031] 31. Screw; 32. Upper positioning block; 33. Limiting slot;

[0032] 41. Rod groove; 42. Through opening; 43. Fixed shaft; 44. Limiting block; 45. Second groove; 46. First groove; 47. Through hole;

[0033] 51. Insert rod; 52. Limiting rod; 53. Spring; 54. Second screw groove;

[0034] 61. Countersunk hole;

[0035] 81. Collar; 82. Positioning rod; 83. Threaded cap. Detailed Implementation

[0036] 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.

[0037] Please see Figures 1-5 This utility model provides a technical solution: a bicycle front fork head tube, including a shoulder fork 1, which is inverted V-shaped. A connecting post 2 is fixedly installed at the top of the shoulder fork 1. A first threaded groove 21 is opened at the top of the connecting post 2. A main tube 3 is arranged above the connecting post 2. A screw rod 31 threaded into the first threaded groove 21 is fixedly installed at the bottom of the main tube 3. Multiple equidistant limiting grooves 33 are opened on both sides of the inner wall of the main tube 3. An inner rod 4 is movably inserted into the main tube 3. A limiting component is provided in the inner rod 4, and the limiting component can engage with the limiting grooves 33 on both sides of the inner wall of the main tube 3. A top rod 6 is provided at the top of the inner rod 4, and a threaded groove is opened at the bottom of the top rod 6. Furthermore, the threaded groove at the bottom of the top rod 6 can be threaded onto the top of the inner rod 4. Through the combined design of the shoulder fork 1, connecting column 2, main tube 3, inner rod 4, limiting component and top rod 6, the orderly connection and cooperation of each component of the fork head tube are realized. Among them, the threaded connection between the connecting column 2 and the main tube 3 provides stability to the basic structure. The movable insertion of the inner rod 4 and the main tube 3 with the limiting component and the limiting slot 33 allows for flexible length adjustment. The threaded connection between the top rod 6 and the inner rod 4 can constrain the position of the limiting component, so that the limiting block 44 in the limiting component can be stably engaged in the limiting slot 33. Compared with the traditional fixed length or inconvenient adjustment of the head tube, the structural flexibility and applicability are improved.

[0038] like Figure 3 , Figure 4 and Figure 5 As shown, a square rod groove 41 is provided at the bottom end of the inner rod 4, and a through-hole 42 communicating with the rod groove 41 is provided at the lower position of both ends of the inner rod 4. A fixed shaft 43 is fixedly installed in both through-holes 42. A first groove 46 is provided at the top end of the inner rod 4, and a second groove 45 communicating with the rod groove 41 is provided at the bottom of the first groove 46.

[0039] The limiting assembly includes two limiting blocks 44, a plug rod 51, a limiting rod 52, and a spring 53. The limiting blocks 44 have a teardrop-shaped cross-section. The tops of the two limiting blocks 44 are respectively rotatably sleeved on two fixed shafts 43, and the outer sides of the two limiting blocks 44 can extend out of the through-hole 42 and engage with the limiting slot 33. The plug rod 51 is movably inserted into the rod slot 41 and presses against the inner side of the limiting blocks 44. The limiting rod 52 is fixedly installed on the top of the plug rod 51 and located in the first groove 46. The spring 53 is located in the second groove 45 and sleeved on the plug rod 54. The square groove 41 on the outside of the rod 51 engages with the insertion rod 51 to prevent the limiting component from rotating. The through port 42 and the fixed shaft 43 provide a base for the installation and movement of the limiting block 44. The teardrop-shaped limiting block 44 can be engaged or disengaged from the limiting groove 33 by the insertion rod 51. The cooperation of the insertion rod 51, the limiting rod 52 and the spring 53 forms a power structure for automatic reset and locking, making the length adjustment operation more convenient and the engagement tighter, solving the problems of complex traditional adjustment structures and unreliable locking.

[0040] like Figure 3 and Figure 5 As shown, the diameter of the first groove 46 is larger than the diameter of the second groove 45, and the size of the first groove 46 is adapted to the size of the limiting rod 52. The two ends of the spring 53 are fixedly connected to the bottom end of the second groove 45 and the bottom end of the limiting rod 52, respectively. When the limiting rod 52 is located in the first groove 46, the spring 53 is in a compressed state, and the bottom end of the insert rod 51 is located between the two limiting blocks 44. By threading the threaded groove at the bottom of the top rod 6 to the top end of the inner rod 4, the top rod 6 presses the limiting rod 52 in the first groove 46 downward, and the insert rod 51 will move and descend with the limiting rod 52. The limiting rod 52 presses the spring 53 to compress it in the second groove 45. When the insert rod 51 descends in the rod groove 41 to the position of the two limiting blocks 44, the bottom end of the insert rod 51 will press the inner side of both limiting blocks 44, so that the two The top of each limiting block 44 rotates outward around the fixed shaft 43, so that the outer side of the limiting block 44 engages in the corresponding limiting groove 33. Since the limiting rod 52 is pressured by the top rod 6, as long as the top rod 6 and the top of the inner rod 4 do not loosen, the insertion rod 51 at the bottom of the limiting rod 52 will always be located between the two limiting blocks 44. In this way, the limiting block 44 can be stably engaged in the limiting groove 33. Through the engagement and restriction between the limiting block 44 and the limiting groove 33, the stable engagement between the inner rod 4 and the main tube 3 is completed. The compressed spring 53 can provide elastic force for reset, so that the insertion rod 51 is moved upward by the elastic force of the spring 53, so that its bottom end is above the two limiting blocks 44. The limiting block 44, which is not squeezed by the insertion rod 51, can separate from the limiting groove 33, thereby contacting the engagement between the main tube 3 and the inner rod 4.

[0041] like Figure 2 , Figure 3 and Figure 5 As shown, the limiting rod 52 has a second threaded groove 54 on both sides, and the inner rod 4 has a through hole 47 communicating with the first groove 46 at the upper position on both sides. The top rod 6 has a countersunk hole 61 communicating with the threaded groove on both sides. A locking bolt 7 is inserted into each of the two countersunk holes 61. The two locking bolts 7 pass through the corresponding countersunk hole 61 and through hole 47 and are threaded into the second threaded groove 54 on both sides of the limiting rod 52. Through the cooperation of the second threaded groove 54 of the limiting rod 52, the through hole 47 of the inner rod 4, the countersunk hole 61 of the top rod 6 and the locking bolt 7, a secondary fixation of the limiting component is formed. On the basis of the engagement of the limiting block 44 and the limiting groove 33, the locking effect is further strengthened, preventing the limiting component from loosening accidentally, ensuring the stability of the structure after adjustment, and reducing abnormal noise and shaking during riding.

[0042] like Figure 1 and Figure 2 As shown, four lower positioning blocks 22 are installed in a circular array near the upper part of the side wall of the connecting column 2, and four upper positioning blocks 32 are installed in a circular array near the lower part of the side wall of the main pipe 3. The size of the upper positioning blocks 32 is the same as that of the lower positioning blocks 22. A movable collar 81 is fitted on the main pipe 3. The side of the collar 81 has four slots extending to its bottom in a circular array. The four slots on the side wall of the collar 81 are respectively fitted onto the outside of the corresponding upper positioning blocks 32 and lower positioning blocks 22. A threaded cap 83 is threaded on the main pipe 3, and the threaded cap 83 can be fitted onto the outside of the collar 81. The circular array of upper positioning blocks 32 and lower positioning blocks 22, together with the grooves on the side wall of the collar 81, form a multi-directional positioning. The threaded cap 83 further strengthens the connection of the collar 81. Compared with a single threaded connection, this greatly improves the connection stability between the connecting column 2 and the main pipe 3 and avoids loosening caused by long-term vibration.

[0043] like Figure 2 As shown, each upper positioning block 32 and lower positioning block 22 has a vertically penetrating positioning hole. The top of the inner wall of each of the four slots is fixedly connected to a vertical positioning rod 82. The four positioning rods 82 are respectively inserted into the positioning holes on the corresponding upper positioning block 32 and lower positioning block 22. Through the positioning holes of the upper positioning block 32 and lower positioning block 22 and the positioning rods 82, the precise positioning of the connecting column 2 and the main tube 3 in the circumferential and axial directions is achieved, which further enhances the firmness and stability of the connection between the two, making the overall structure less prone to deformation or loosening during riding vibration, and ensuring the long-term reliability of the fork head tube.

[0044] 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 bicycle fork head tube, characterized in that, include: Shoulder fork (1), in the shape of an inverted V; The connecting post (2) is vertically installed on the top of the shoulder fork (1), and a first threaded groove (21) is provided on the top of the connecting post (2); The main tube (3) has a screw (31) threaded into the first screw groove (21) fixedly installed at the bottom end. Multiple equidistant limiting slots (33) are provided on both sides of the inner wall of the main tube (3). The inner rod (4) is movably inserted into the main tube (3); The limiting component is installed in the inner rod (4), and the limiting component can engage with the limiting slots (33) on both sides of the inner wall of the main tube (3); The top rod (6) has a threaded groove at the bottom, and the threaded groove at the bottom of the top rod (6) can be threaded onto the top of the inner rod (4).

2. The bicycle fork head tube according to claim 1, characterized in that, The bottom end of the inner rod (4) is provided with a square rod groove (41). At the lower position of both ends of the inner rod (4), there are openings (42) communicating with the rod groove (41). A fixed shaft (43) is fixedly installed in both openings (42). The top end of the inner rod (4) is provided with a first groove (46). At the bottom of the first groove (46), there is a second groove (45) communicating with the rod groove (41). The limiting assembly includes two limiting blocks (44), a plug rod (51), a limiting rod (52), and a spring (53). The limiting blocks (44) have a teardrop-shaped cross section. The tops of the two limiting blocks (44) are respectively rotatably sleeved on two fixed shafts (43), and the outer sides of the two limiting blocks (44) can extend out through the opening (42) and engage with the limiting slot (33). The plug rod (51) is movably inserted into the rod slot (41) and presses the inner side of the limiting blocks (44). The limiting rod (52) is fixedly installed on the top of the plug rod (51) and located in the first groove (46). The spring (53) is located in the second groove (45) and sleeved on the outside of the plug rod (51).

3. The bicycle fork head tube according to claim 2, characterized in that, The diameter of the first groove (46) is larger than the diameter of the second groove (45), and the size of the first groove (46) is adapted to the size of the limiting rod (52). The two ends of the spring (53) are fixedly connected to the bottom end of the second groove (45) and the bottom end of the limiting rod (52) respectively. When the limiting rod (52) is located in the first groove (46), the spring (53) is in a compressed state, and the bottom end of the insertion rod (51) is located between the two limiting blocks (44).

4. The bicycle fork head tube according to claim 2, characterized in that, The limiting rod (52) has a second threaded groove (54) on both sides. The inner rod (4) has a through hole (47) communicating with the first groove (46) at the upper position on both sides. The top rod (6) has a countersunk hole (61) communicating with the threaded groove on both sides. A locking bolt (7) is inserted into each of the two countersunk holes (61). The two locking bolts (7) pass through the corresponding countersunk hole (61) and through hole (47) and are threaded into the second threaded groove (54) on both sides of the limiting rod (52).

5. A bicycle fork head tube according to claim 1, characterized in that, Four lower positioning blocks (22) are installed in a circular array at the upper position of the side wall of the connecting column (2), and four upper positioning blocks (32) are installed in a circular array at the lower position of the side wall of the main pipe (3). The size of the upper positioning blocks (32) is the same as that of the lower positioning blocks (22). A movable collar (81) is fitted on the main pipe (3). The side of the collar (81) has four slots extending to its bottom in a circular array. The four slots on the side wall of the collar (81) are respectively fitted on the outside of the corresponding upper positioning blocks (32) and lower positioning blocks (22). A threaded cap (83) is threaded on the main pipe (3), and the threaded cap (83) can be fitted on the outside of the collar (81).

6. A bicycle fork head tube according to claim 5, characterized in that, Each of the upper positioning block (32) and lower positioning block (22) is provided with a vertically penetrating positioning hole. The top of the inner wall of each of the four slots is fixedly connected with a vertical positioning rod (82), and the four positioning rods (82) are respectively inserted into the positioning holes on the corresponding upper positioning block (32) and lower positioning block (22).

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