Steel ball compound wheel set with string length fine adjustment device

Abstract

The utility model relates to the technical field of sports equipment, concretely relates to a steel ball compound bow wheel set with string length fine adjustment device, including main wheel and string length fine adjustment device, the string length fine adjustment device includes the tuning peg that sets up with a plurality of adjusting screw hole and has the eccentricity hanging string point of adjusting arm, the eccentricity hanging string point is installed in the tail of tuning peg, the eccentricity hole of eccentricity hanging string point inserts and connects with the string hanging pin shaft, the axle head of string hanging pin shaft is connected with tuning peg, be equipped with the locating hole that can be aligned with adjusting screw hole on adjusting arm, the locating bolt that can be matched with adjusting screw hole is assembled in locating hole. The utility model can realize respectively to unilateral main string length's accurate, grading adjustment under the premise of not using the bow opener, not disassembling main string, thereby the tension difference between two main strings is corrected quickly, eliminates the steel ball trajectory deviation caused by two side main string tension imbalance, and the shooting precision and trajectory stability of steel ball compound bow are improved obviously.

Description

Technical Field

[0001] This utility model relates to the field of sports equipment technology, specifically to a steel ball composite bow wheel assembly with a chord length fine-tuning device. Background Technology

[0002] The ball bearing composite bow, a high-performance bow widely used in modern archery, employs a double main string design with an eccentric wheel assembly, effectively improving energy transfer efficiency and shooting stability. In this structure, two main strings are connected to wheel assemblies at both ends of the bow, achieving symmetrical rebound of the bow arms through synchronized rotation of the wheel assemblies. To ensure the straightness and consistency of the ball's trajectory, the two main strings must maintain a highly consistent stress state.

[0003] However, as Figure 1 As shown, most ball bearing composite bows currently use a fixed string attachment point 1 on the main wheel 1. This means the string lug 3 at the end of the main string 2 is directly connected to the main string attachment point of the wheel assembly, making fine-tuning of the length impossible. When slight length differences occur between the two main strings due to material stretching, changes in ambient temperature and humidity, assembly errors, or long-term use, it directly causes an imbalance in the tension of the two main strings. This leads to problems such as asymmetrical force on the eccentric wheel and bow limbs, and inconsistent rebound of the two main strings. Ultimately, this manifests as a skewed ball trajectory and increased dispersion, and in severe cases, the ball may even hit the bow window.

[0004] The existing adjustment method for ball bearing compound bows typically requires using a bow opener to completely unload the bow limbs, removing the main string, and then adjusting the number of turns of the string strands by twisting the string. However, this method of adjusting the length by twisting the string is not very precise. When high consistency of tension between the two main strings is required, it can result in the bow being too tight by one turn and too loose by one turn. This process is not only cumbersome and time-consuming, but also difficult to control in terms of adjustment accuracy. It often requires repeated trial and error to approach the ideal state, which cannot meet the needs of ball bearing bow users for rapid and accurate calibration.

[0005] Therefore, there is an urgent need for a technical solution that can achieve fine adjustment of the main string length without disassembling the main string or requiring professional tools. Utility Model Content

[0006] The purpose of this invention is to provide a ball bearing composite bow wheel assembly with a string length fine-tuning device to solve the technical defects of existing ball bearing composite bows, which result in complex and low-precision main string adjustment processes due to the non-adjustable main string hanging point.

[0007] To solve the above problems, the technical solution adopted by this utility model is as follows: A steel ball composite bow wheel assembly with a chord length fine-tuning device includes a main wheel; the main wheel is provided with a chord length fine-tuning device; the chord length fine-tuning device includes a tuning plate with a plurality of adjusting screw holes and an eccentric string-hanging point with an adjusting arm, the eccentric string-hanging point being installed at the tail of the tuning plate; a string-hanging pin is inserted into the eccentric hole of the eccentric string-hanging point, the shaft end of the string-hanging pin being connected to the tuning plate; the adjusting arm is provided with a positioning hole that aligns with the adjusting screw holes, and a positioning bolt that matches the adjusting screw holes is fitted into the positioning hole.

[0008] Preferably, the tuning plate has two rows of adjusting screw holes arranged in an arc shape, and the two rows of adjusting screw holes are staggered; the adjusting arm has two positioning holes that can be aligned with the two rows of adjusting screw holes respectively.

[0009] Preferably, a spring retaining ring is installed at the part where the end of the string pin connects with the tuning plate.

[0010] Beneficial effects: Compared with the prior art, this utility model can achieve precise and graded adjustment of the length of the main string on one side without using a bow drawer or disassembling the main string, thereby quickly correcting the tension difference between the two main strings, eliminating the ballistic deviation of the steel ball caused by the tension imbalance of the two main strings, and significantly improving the shooting accuracy and ballistic stability of the steel ball composite bow. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a traditional steel ball composite bow wheel assembly in the prior art; Figure 2 This is a schematic diagram of the three-dimensional structure of the steel ball composite bow wheel assembly described in this utility model. Figure 1 ; Figure 3 This is a schematic diagram of the three-dimensional structure of the steel ball composite bow wheel assembly described in this utility model. Figure 2 .

[0012] The attached diagram is labeled as follows: 1-Main wheel; 2-Main string; 3-String ear; 4-Fixed string hanging point; 5-Tuning plate; 6-Adjusting screw hole; 7-String hanging pin; 8-Eccentric string hanging point; 9-Adjusting arm; 10-Positioning bolt; 11-Spring retaining ring. Detailed Implementation

[0013] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Example

[0014] Reference Figure 2 , 3 As shown in the figure, the steel ball composite bow wheel assembly with chord length fine adjustment device described in this embodiment includes a main wheel 1 and a chord length fine adjustment device disposed on the main wheel.

[0015] The string length fine-tuning device includes a tuning plate 5 with several adjusting screw holes 6 and an eccentric string-hanging point 8 with an adjusting arm 9; the tuning plate 5 is fixed on the main wheel 1, and the eccentric string-hanging point 8 is installed at the tail of the tuning plate 5 (i.e., Figure 1 The position of the fixed stringing point in a conventional steel ball composite bow wheel assembly is shown in the diagram.

[0016] A string-hanging pin 7 is inserted into the eccentric hole of the eccentric string-hanging point 8, and the shaft end of the string-hanging pin 7 is connected to the tuning plate 5. The eccentric hole of the eccentric string-hanging point 8 and the string-hanging pin 7 are clearance-fitted. To prevent the eccentric string-hanging point 8 from falling off, a spring retaining ring 11 is installed at the part where the shaft end of the string-hanging pin 7 connects with the tuning plate 5.

[0017] The tuning plate 5 has two rows of adjusting screw holes 6 arranged in an arc shape, with the two rows of adjusting screw holes staggered. In this embodiment, there are 10 adjusting screw holes 6, with 5 in each of the upper and lower rows, forming ten levels of adjustment for the main string 2. The adjusting arm 9 has two positioning holes that can be aligned with the upper and lower rows of adjusting screw holes 6, respectively, and positioning bolts 10 that match the adjusting screw holes 6 are installed in the positioning holes.

[0018] During assembly, the main string 2's string lugs are attached to the eccentric string hanging point 8. By rotating the adjusting arm 9 of the eccentric string hanging point 8, the eccentric string hanging point 8 is rotated at a certain angle, causing the axis of the string hanging pin 7 to shift relative to the string hanging force surface of the eccentric string hanging point 8. This changes the effective string hanging length of the main string 2, enabling precise graded adjustment of the tension of the main string 2. After the positioning hole on the adjusting arm 9 is aligned with the corresponding adjusting screw hole 6 on the tuning plate 5, tightening the positioning bolt 10 completes one fine adjustment. There are 10 staggered adjusting screw holes 6 on the tuning plate 5. When fixed to the leftmost first adjusting screw hole 6, the main string 2 is in a state of minimum stress. When adjusted to the tenth adjusting screw hole 6, the distance between the string lug 3 of the main string 2 and the string hanging pin 7 reaches its maximum, which is the state of maximum stress for the main string 2.

[0019] Specifically, in actual use, if the steel ball's landing point is found to be shifted to the left, it can be determined that the left main string is too loose. At this time, rotate one or more positions of the eccentric string-hanging point 8 connected to the left main string clockwise (e.g., from the 1st hole to the 3rd hole) to shorten the effective length of the left string and increase its stress until the trajectory is centered. This device achieves fine-grained adjustment through 10 preset angles, compensating for the accuracy error of string-twisting adjustment and ensuring that the stress of the two main strings is consistent to the greatest extent, achieving the optimal shooting state.

[0020] In summary, this utility model has a reasonable structure, is easy to operate, provides precise adjustment, and is reliable in performance. It is an ideal solution for fine-tuning the length of a steel ball composite bowstring, possessing good practical value and market prospects. Specifically, this utility model has the following significant advantages and positive effects: 1. Convenient and efficient adjustment: No need to disassemble the main string or use a bow opener. Simply remove the positioning bolt 10, rotate the adjusting arm 9 to align with the corresponding adjusting screw hole 6, install and tighten the positioning bolt 10 to complete a fine adjustment of the main string stress. The operation is simple and quick, and it is especially suitable for real-time calibration during training or competition.

[0021] 2. High adjustment accuracy and good repeatability: It adopts a 10-level eccentric adjustment structure, with each level corresponding to a fixed change in chord length. The adjustment accuracy can reach 0.2mm level (the adjustment accuracy of one turn of the traditional string-tightening method is only about 1mm). It effectively eliminates small stress differences, and the adjustment results are repeatable and recordable.

[0022] 3. Significantly improve shooting performance: By precisely matching the stress state of the two main strings, the asynchronous rebound of the main strings is reduced, and the symmetry of the bowstring rebound is improved, thereby significantly improving the consistency of the ballistics and shooting accuracy.

[0023] 4. User-friendly human-computer interaction: Divided into 10 adjustment levels according to the number of adjustment screw holes, providing intuitive visual feedback and more precise adjustment methods.

[0024] 5. Strong compatibility and easy to promote: This structural design can be integrated into various wheel assembly structures, is compatible with various models of ball bearing composite bows, has low manufacturing cost, and is easy to mass-produce and promote application.

[0025] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0026] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A steel ball composite bow wheel assembly with a chord length fine-tuning device, comprising a main wheel (1); characterized in that: The main wheel is provided with a chord length fine adjustment device; the chord length fine adjustment device includes a tuning plate (5) with a plurality of adjusting screw holes (6) and an eccentric string hanging point (8) with an adjusting arm (9), the eccentric string hanging point (8) is installed at the tail of the tuning plate (5); a string hanging pin (7) is inserted into the eccentric hole of the eccentric string hanging point (8), and the shaft head of the string hanging pin (7) is connected to the tuning plate (5); the adjusting arm (9) is provided with a positioning hole that can be aligned with the adjusting screw holes (6), and a positioning bolt (10) that can match the adjusting screw holes (6) is installed in the positioning hole.

2. The steel ball composite bow wheel assembly with chord length fine-tuning device according to claim 1, characterized in that: The tuning plate (5) is provided with two rows of adjustment screw holes (6) arranged in an arc shape, and the two rows of adjustment screw holes are staggered; the adjustment arm (9) is provided with two positioning holes that can be aligned with the two rows of adjustment screw holes (6) respectively.

3. A steel ball composite bow wheel assembly with a chord length fine-tuning device according to claim 1, characterized in that: A spring retainer ring (11) is installed at the part where the shaft end of the string pin (7) connects with the tuning plate (5).

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