Adjusting structure of dual-binary micro-balance composite bow wheel set

Abstract

The utility model relates to a dual-binary micro-balance composite bow wheel set adjusting structure which effectively solves the problems that an existing adjusting mechanism is not visual in result feedback, complex in structure, troublesome in operation, laborious in adjustment and the like. According to the technical scheme, the wheel set comprises a wheel set body, a binary wheel groove, a chord ear hanging point and an adjusting unit are arranged on the body, the adjusting unit is located between the binary wheel groove and the chord ear hanging point, the adjusting unit comprises a datum hole perpendicular to the plane of the wheel set body, and a rotatable flange plate is coaxially installed in the datum hole. A left eccentric wheel is fixed on the left side of the flange plate, a right eccentric wheel is fixed on the right side of the flange plate, the left eccentric wheel and the right eccentric wheel are arranged eccentrically with the flange plate, and the phase angle of the left eccentric wheel and the right eccentric wheel is 180 degrees; the utility model discloses can reach very fine stepless regulation variable, can adjust the deflection of wheel set, and simple structure, will not increase the weight and volume of whole bow, and the regulation operation is simple, does not need the special tool.

Description

Technical Field

[0001] The utility model relates to the field of compound bows, in particular to a double binary micro-balance compound bow wheel group adjustment structure. Background Art

[0002] The basic components of a compound bow are the handle, limbs, wheel set, main string and secondary string. The secondary string can be symmetrically placed on both sides of the handle, and a string splitter can be used to open up space for the arrow feathers to pass through. However, if this method is used, the archer needs to pass the arrow through the secondary string when nocking the arrow, which is inconvenient to operate. Therefore, people are more inclined to use a string splitter to pull the secondary string to a single side of the handle. The advantage is that the arrow-nocking action is more efficient, which is even more obvious in complex environments. There is no need to worry about the arrow scratching the secondary string when passing through it.

[0003] Using a splitter to pull the secondary string to one side of the bow handle has the advantages of convenient arrow nocking and safe operation. However, since the secondary string is always pulled by the splitter from drawing the bow to shooting the arrow, splitting stress is generated, which will cause the wheel set and bow pieces to bear lateral tension. The phenomenon manifested is that the deformation of the bow pieces on the other side of the splitter will be slightly greater than the deformation of the bow pieces on the side with the splitter, which will cause the wheel set to skew, which will affect both accuracy and life. The impact on accuracy is: due to the difference in bow piece deformation, asynchronous rebound, and the shaking of the skewed wheel set during rotation, all of which produce adverse vibrations and consume energy that originally belonged to pushing the arrow; the lateral force acting on the arrow affects the arrow's flight posture and reduces archery accuracy; the impact on life is that the skewed wheel set has more friction on the bowstring when rotating, which aggravates bowstring wear. In addition, the skewed wheel set also makes the bearing force uneven, which will make the bearing force on one side greater than the other side, resulting in bearing damage.

[0004] Most of the side-split compound bows on the market try to offset the difference in limb deformation caused by the splitting stress by configuring limbs with different elastic forces. The usual practice is to make the limbs on the splitter side weaker to achieve balance. However, due to manufacturing tolerances, limb material density errors and other factors, the same set of limbs with calibrated elastic forces still have different torques under different bending indicators. Moreover, since different archers adjust the tension and draw length differently, the degree of influence reflected by this difference is also different. This will cause a phenomenon that this bow can pass through white paper perfectly under a certain tension and draw saw, but cannot pass through white paper under other tensions and draw saws. In order to compensate for these subtle differences, the bow tuner has to achieve the adjustment purpose by padding a limb with different thicknesses or disassembling the bow and changing the thickness of the shims on both sides of the wheel set. This is very cumbersome and time-consuming, and increases the cost of bow tuning.

[0005] In Patent US20220120530A1, a dual-binary wheel set structure is disclosed, with a binary wheel on each side of the wheel set. In this way, the original I-cable auxiliary string becomes a Y-cable auxiliary string, which allows for selective twisting of the string cable and shortening of the unilateral string cable length to provide additional pulling force. However, the amount of cable shortening increases exponentially with the number of twists. Simply put, when determining the need to shorten the cable, twisting half a turn results in over-adjustment. This is actually because the adjustment resolution of this method is insufficient. Additionally, this adjustment method requires professional equipment such as a bow opener, which brings more hidden costs to the archer.

[0006] In Patent US11821708B1, a method is disclosed for replacing the thickness shims on both sides of the wheel set without disassembling the bow. The essence is to manufacture a variety of open shims with different thicknesses and clamp them on the wheel axle. When adjustment is needed, the original open shim can be removed using a special tool, and then a thinner or thicker open shim can be installed using the special tool. In this way, the more precise the adjustment required, the more open shims with different thickness specifications need to be manufactured additionally. Once the bow is tuned, the remaining shims become useless, resulting in waste of resources and environmental hazards. Moreover, the open shims themselves have strength defects and there is also a risk of being flung off due to vibration. If a certain open shim is flung off in a complex environment and not noticed, it is extremely easy for the archer to experience a string release failure when shooting an arrow.

[0007] In Patent CA2968704A1, a wheel set horizontally adjustable structure is disclosed. The method is to use a lead screw to push and pull the horizontal position of the wheel set, causing the distance between both sides of the wheel set and the bow limbs to change. This stepless adjustment method is more convenient than replacing the side shims of the wheel set. After tuning, no components are discarded and it can be locked, eliminating the worry of loosening and shifting due to long-term use. The disadvantage of this structure is that since the wheel axle bears the resultant force of all the elastic forces of the bow limbs, the force required to overcome for the overall horizontal sliding of the wheel set is very large, resulting in a large torque when using a wrench to turn the adjustment lead screw. Additionally, since the adjustment result is the horizontal sliding of the wheel set, the main string will deviate from its original designed position, so after tuning the wheel deviation, the arrow rest position needs to be adjusted again to adapt to the new position of the main string.

[0008] In Patent CN112212737A, an adjustable yaw structure of the bow limb support is disclosed. The method is to use a setscrew to make the bow limb support deflect, reducing the difference in bow limb elastic force to offset the deflection of the wheel set. The advantage of this structure is that it does not change the position of the main string and will not cause the main string to deviate from its original designed position due to adjustment. It also has the advantages of stepless adjustment and locking function. However, the force borne by the bow limb support is the largest force on the entire bow, which is the resultant force of the bow limb elastic force, and the torque to be adjusted is greater. Therefore, to ensure the strength of the structural components, this structure increases the weight and volume of the entire bow, raises the processing cost, and increases the burden on the archer. A heavier bow will make it more difficult for the archer to aim;

[0009] In Patent CN211783033U, a single-bow-limb pressure-regulating structure of the bow limb cover is disclosed. Its implementation principle is to add a setscrew to the bow limb cover. The setscrew is directly opposite to the back of the tail of the bow limb. The setscrew applies pressure to a single bow limb, increasing the pre-bending amount of the bow limb to thereby increase the elastic force and balance the deflection of the wheel set. This adjustment method has the lowest cost among the above several patents and will not cause the main string to deviate from the designed position. Except for the situation where the elastic force of the bow limb tail is very large, which also leads to excessive torque, after the setscrew jacks up the back of the bow limb tail and leaves the bow limb cover, a suspended area is generated, weakening the strength of the bow limb cover to fix the position of the bow limb. When the bow limb originally cooperates with the bow limb cover, the back of the bow limb and the inner top surface of the bow limb cover are in surface contact, with a large contact area, reducing the pressure on the back of the bow limb tail and having strong structural stability. However, the contact between the setscrew and the back of the bow limb tail is point contact, with a very small contact area, increasing the pressure on the back of the bow limb tail and increasing the risk of bow limb cracking. Summary of the Invention

[0010] In view of the above situation, the present utility model provides a double-binary micro-balance compound bow wheel set adjustment structure.

[0011] The technical solution it solves includes a wheel set body. The body is provided with a binary wheel groove and a string ear hanging point. The binary wheel groove includes a right wheel groove and a left wheel groove symmetrically arranged on both sides of the wheel set body. The string ear hanging point includes a right hanging point and a left hanging point symmetrically arranged on both sides of the wheel set body. The wheel set body is also provided with an adjustment unit. The adjustment unit is located between the binary wheel groove and the string ear hanging point. The adjustment unit includes a reference hole perpendicular to the plane of the wheel set body. A rotatable flange is coaxially installed in the reference hole. A left eccentric wheel is fixed on the left side of the flange, and a right eccentric wheel is fixed on the right side of the flange. Both the left eccentric wheel and the right eccentric wheel are eccentrically arranged with respect to the flange, and the phase angle between the left eccentric wheel and the right eccentric wheel is 180 degrees.

[0012] The flange is composed of a left disc body and a right disc body. A threaded hole is opened on the right disc body, and a locking bolt is passed through the left disc body.

[0013] The circumferential limiting structure described above includes a strip-shaped protrusion provided at the left end of the right disc body and a strip-shaped groove opened at the right end of the left disc body, and the strip-shaped protrusion is embedded in the strip-shaped groove.

[0014] A torsion structure is provided at the right end of the right disc body described above.

[0015] The surface of the wheel set body is provided with circumferential scales located around the reference hole, and a pointer is provided on the flange.

[0016] The utility model can achieve a very fine stepless adjustment amount, can adjust the skew of the wheel set, has a simple structure, does not increase the weight and volume of the whole bow, and the adjustment operation is simple and does not require special tools. Description of the Drawings

[0017] Figure 1 is a three-dimensional view of the utility model Figure 1 。

[0018] Figure 2 is a three-dimensional view of the utility model Figure 2 。

[0019] Figure 3 is a three-dimensional view of the utility model Figure 3 。

[0020] Figure 4 is an exploded view of the utility model.

[0021] Figure 5 is a front view of the utility model.

[0022] Figure 6 is a schematic diagram of the wheel set skew phenomenon; in the figure, 14a is the left bow piece and 14b is the right bow piece. Detailed Embodiments

[0023] Combined with the attached drawings, the utility model includes a wheel set body 1. There are binary wheel grooves and string ear hanging points on the body. The binary wheel grooves include a right wheel groove 2a and a left wheel groove 2b symmetrically arranged on both sides of the wheel set body 1. The string ear hanging points include a right hanging point 3a and a left hanging point 3b symmetrically arranged on both sides of the wheel set body 1. There is also an adjusting unit on the wheel set body 1, and the adjusting unit is located between the binary wheel grooves and the string ear hanging points. The adjusting unit includes a reference hole 4 perpendicular to the plane of the wheel set body 1. A rotatable flange 9 is coaxially installed in the reference hole 4. A right eccentric wheel 8a is fixed on the right side of the flange 9, and a left eccentric wheel 8b is fixed on the left side of the flange 9. Both the left eccentric wheel 8b and the right eccentric wheel 8a are eccentrically arranged with respect to the flange 9, and the phase angles of the left eccentric wheel 8b and the right eccentric wheel 8a are 180 degrees. After the binary string winds around the binary wheel grooves, it first passes through the eccentric wheels of the adjusting unit and then is hung on the string ear hanging points. By rotating the flange 9 to drive the eccentric wheels to rotate, different tensile forces can be applied to the binary string. Since the eccentric wheels on both sides have an angular difference of 180 degrees, different tensioning effects will be generated on the left and right sides, and a tensile force difference will be generated between the single cables of the double binary strings. This difference will correct the degree of wheel set skew.

[0024] The flange 9 is composed of a right disk body 9a and a left disk body 9b. There are threaded holes on the right disk body 9a, and a locking bolt 13 is inserted through the left disk body 9b. After the left disk body 9b and the right disk body 9a are simultaneously inserted into the reference hole 4, the locking bolt 13 is inserted into the threaded hole and tightened to connect the two disk bodies into the flange 9, and the two disk bodies are pressed against the surface of the wheel set body 1 to achieve circumferential locking. When it is necessary to rotate the flange 9, slightly loosen the locking bolt 13, rotate the flange 9 to the required angle and then tighten the locking bolt 13. There is a circumferential limiting structure between the left disk body 9b and the right disk body 9a to limit the relative rotation between the left disk body 9b and the right disk body 9a.

[0025] The circumferential limiting structure includes a strip-shaped protrusion 10 provided at the left end of the right disk body 9a and a strip-shaped groove 12 provided at the right end of the left disk body 9b. The strip-shaped protrusion 10 is embedded in the strip-shaped groove 12 to perform circumferential limiting on the two disk bodies.

[0026] A torsion structure 7 is opened at the right end of the right disk body 9a. The torsion structure can be an internal hexagonal hole, a cross hole, a plum blossom hole, etc. The flange 9 can be rotated by inserting a hexagonal wrench or a corresponding screwdriver into the hole. It can also be a hand-rolled wheel and can be directly rotated by hand.

[0027] There is a circumferential scale 5 on the surface of the wheel set body 1 surrounding the reference hole 4, and a pointer 6 is provided on the flange 9. The angular position of the flange 9 can be directly read through the pointer 6 and the scale 5.

[0028] When adjusting the present utility model, first, slightly loosen the locking bolt 13, then insert a hex wrench into the hex wrench hole 7 and rotate the flange 9. The flange 9 drives the two eccentric wheels to rotate, thereby adjusting the tension force of the eccentric wheels on the bowstring. After the adjustment is completed, tighten the locking bolt 13 to lock the flange 9.

[0029] Due to the 180-degree angular difference between the eccentric wheels on both sides, different tension effects will be generated on the left and right sides, and a tension difference will be generated between the single cables of the double binary string. This difference will correct the degree of skewness of the wheel set.

[0030] The present utility model has remarkable advantages:

[0031] 1. Stepless adjustment can achieve a very fine adjustment amount, allowing the archer to readjust after over-adjusting. This could not be achieved by the previous method of the double binary wheel shortening the single string cable by twisting the string, because adjusting the bow only allows tightening the string and does not allow reversing to loosen the string, as reversing will cause the string guard wrapped around the string material to come loose.

[0032] 2. Since the centers of the tension wheels on both sides are equidistant from the center of the flange disc and are distributed at 180 degrees, the pressures of the double binary strings borne by the tension wheels on both sides are the same. Therefore, when adjusting the eccentricity, the frictional force of the double binary string to be overcome is very small, and the torque required when adjusting with a wrench is very low. The archer can easily achieve the tuning purpose; at the same time, since the pressure of the double binary string borne by the tension wheel is very small, the screw tension required to lock the screw to clamp the flange disc is also very low; moreover, the adjustment result can be visually seen without the need for archery verification.

[0033] 3. The adjustment mechanism is set on the wheel set, and the adjustment operations are all directly carried out on the wheel set. Thus, the adjustment results are also directly applied to the wheel set. Adjusting the tension wheel mechanism to generate a tension difference between the double binary strings on both sides of the wheel set will quickly correct the skewness of the wheel set. Only the skewed posture of the wheel set is changed, and the elastic force of the bow limb is not affected, nor is the load on the wheel axle or the bow limb support increased. It will not affect the original design performance of the bow limb, will not cause the side effect of additional lateral force on the bow limb due to adjusting the wheel deviation, and will not increase the weight or volume of the whole bow due to the bulky mechanism.

[0034] 4. To achieve the adjustment purpose, no additional special equipment is required. Each archer will have a set of hex wrenches for adjusting the draw weight and draw length of the bow and installing accessories. This is the most basic and commonly used tool. When the archer needs to adjust the wheel deviation, use the hex wrench to loosen the locking screw. On the other side, also insert the hex wrench into the wrench socket and rotate the hex wrench to adjust the wheel deviation. After the adjustment is completed, tighten the locking screw with the wrench. The adjustment cost is low, the adjustment efficiency is high, and the locking is convenient.

[0035] 5. By using an eccentric wheel mechanism, the mechanism is made simple, resulting in low component costs. At the same time, since the torque required for adjustment to achieve the adjustment purpose is small, the wear of the mechanism parts is small and the durability is high.

[0036] 6. Let the binary string pass through the eccentric wheel and then be hung on the string ear hanging point, forming a cornered manner, which reduces the tension of the binary string on the string ear hanging point, reduces the pressure on the string ear. In addition, due to the corner of the binary string, the string ear will not rotate at the hanging point and will not wear the string ear, improving the life of the string ear; due to the addition of a corner to the binary string, the circumference of the binary string around the binary wheel groove increases. On the premise that the binary string does not leave the binary wheel groove, the total rotation angle of the wheel set is allowed to increase.

Claims

1. Dual-binary micro balance compound bow wheel set adjusting structure, including a wheel set body (1), with a binary wheel groove and a string ear hanging point on the body. The binary wheel groove includes a right wheel groove (2a) and a left wheel groove (2b) symmetrically arranged on both sides of the wheel set body (1), and the string ear hanging points include a right hanging point (3a) and a left hanging point (3b) symmetrically arranged on both sides of the wheel set body (1). It is characterized in that, The wheel set body (1) is further provided with an adjusting unit, which is located between the dual wheel groove and the chord ear hanging point. The adjusting unit includes a reference hole (4) perpendicular to the plane of the wheel set body (1). A rotatable flange (9) is coaxially installed in the reference hole (4). A left eccentric wheel (8b) is fixed on the left side of the flange (9), and a right eccentric wheel (8a) is fixed on the right side of the flange (9). Both the left eccentric wheel (8b) and the right eccentric wheel (8a) are eccentrically arranged with respect to the flange (9), and the phase angles of the left eccentric wheel (8b) and the right eccentric wheel (8a) are 180 degrees.

2. The dual-binary microbalance composite bow wheel set adjusting structure according to claim 1, wherein The flange (9) is composed of a right side disc body (9a) and a left side disc body (9b). Threaded holes are formed in the right side disc body (9a), and a locking bolt (13) is passed through the left side disc body (9b); a circumferential limiting structure is provided between the left side disc body (9b) and the right side disc body (9a).

3. The dual-binary microbalance composite bow wheel set adjusting structure according to claim 2, characterized in that, The circumferential limiting structure includes a strip-shaped protrusion (10) provided at the left end of the right side disc body (9a) and a strip-shaped groove (12) formed at the right end of the left side disc body (9b), and the strip-shaped protrusion (10) is embedded in the strip-shaped groove (12).

4. The dual-binary microbalance composite bow wheel set adjusting structure according to claim 2, characterized in that, A torsion structure (7) is provided at the right end of the right side disc body.

5. The double-binary microbalance composite bow wheel set adjusting structure according to claim 1, characterized in that, A circumferential scale (5) is provided on the surface of the wheel set body (1) around the reference hole (4), and a pointer (6) is provided on the flange (9).

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