Anti-deflection structure of composite bow

Abstract

The utility model discloses an anti-deflection structure of a composite bow, which belongs to the technical field of composite bows and comprises bow walls arranged on two sides of a cam, the cam is rotatably connected between the ends of the two bow walls, a rotating component is arranged between the cam and the bow walls, the ends of the bow walls are provided with clamping sleeves matched with the ends of the bow walls, and the clamping sleeves are connected with the cam. The rotating assembly penetrates through the cam and the two arch walls, and the cam is in rotating connection with the clamping sleeves on the arch walls. According to the scheme, the cam rotates between the ends of the two arch walls through the rotating assembly, the clamping sleeve structures are arranged at the ends of the arch walls, on one hand, the gap between the ends of the two arch walls can be reduced, and on the other hand, the clamping contact area between the ends of the arch walls and the cam is increased; after the clamping sleeve abuts against the end of the cam, deflection of the cam due to stress can be effectively prevented under the condition that rotation of the cam is not affected, the deflection angle of the cam is reduced, and the shooting effect is improved.

Description

Technical Field

[0001] This utility model relates to a composite bow structure, and more specifically, to a composite bow anti-sway structure. Background Technology

[0002] The hinge points of the cam and bow wall in a double-string compound bow employ a bearing design to allow rotation between the cam and the bow wall. Using a 3mm shaft diameter and a standard bearing (3mm inner diameter × 10mm outer diameter × 4mm thickness), there is a clearance of 0.05 to 0.1mm, resulting in a 0.3 to 0.5° yaw angle under a torque of 50 N·m. In addition, the inherent yaw rate of the bearing support structure is generally greater than 1.2%, and the clamping contact area at the end of the bow wall is small. Furthermore, the inherent defect of inconsistent left and right tension due to the special force-saving and kinetic energy design of the secondary string of the wheel set also causes the compound bow cam to yaw during use, thus affecting the shooting effect of the compound bow.

[0003] For example, Chinese Patent Publication No. CN119178347A, published on December 24, 2024, entitled "An Integrated Compound Bow," discloses a combined bow wheel assembly structure for a compound bow, including an adjustable draw length sub-wheel and two main wheels. It can be used alone as a standard compound bow or with the main wheels to hang a long main string. The adjustable draw length sub-wheel is installed on one side of the main wheels to adjust the draw length. The operating mechanism includes a housing, a release component, and a string-opening positioning component. One end of the housing is detachably mounted on the standard compound bow. Along the long side of the housing, the release component and the string-opening positioning component are sequentially arranged, with the string-opening positioning component located at the end furthest from the standard compound bow. The standard compound bow and operating mechanism can be used with the main wheels to hang a short main string to form a crossbow. When the compound bow is not loaded with arrows, the release component and the string-opening positioning component maintain multiple locks to prevent the compound bow from being released empty. However, in this design, during the drawing of the compound bow, a sway angle easily occurs between the cam and the bow wall, affecting the shooting effect. Utility Model Content

[0004] This invention overcomes the problem of easy swaying between the existing double-string composite bow wheel assembly and the bow wall, and provides a composite bow anti-swaying structure. This solution can effectively reduce the degree of swaying of the composite bow wheel assembly on the bow wall, reduce the swaying angle, and improve the shooting effect.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a composite bow anti-sway structure, including bow walls disposed on both sides of a cam, the cam being rotatably connected between the ends of the two bow walls, a rotating assembly being provided between the cam and the bow walls, and a sleeve adapted to the end of the bow wall being provided. The rotating assembly passes through the cam and the two bow walls, and forms a rotatable connection between the cam and the sleeve on the bow wall. In this solution, the cam rotates between the ends of the two bow walls through the rotating assembly. The sleeve structure at the end of the bow wall can reduce the gap between the ends of the two bow walls and increase the clamping contact area between the end of the bow wall and the cam. After the sleeve abuts against the end of the cam, it can effectively prevent the cam from swaying under force without affecting the rotation of the cam, reduce the cam's sway angle, and improve the shooting effect.

[0006] Preferably, the rotating assembly includes a hollow shaft that passes through both bow walls and the cam. The hollow shaft conforms to the lightweight design of the cam assembly and serves as the rotational shaft between the cam and the bow walls.

[0007] Preferably, the rotating assembly includes bearings symmetrically arranged on both sides of the cam, and the bearings are mounted on the shaft. By providing bearings on both sides of the cam, the double-chord tension on the cam is distributed across the two sets of bearings, effectively preventing cam wobble while distributing the load.

[0008] Preferably, the shaft is further provided with a bushing, which is located inside the cam and between the two bearings. The bushing prevents the bearings from deforming when they are tightened and squeezed from both sides, thus affecting the function of the bearings.

[0009] Preferably, a shim is provided between the bearing and the jacket, the diameter of which is smaller than the inner ring diameter of the bearing. The shim adjusts the clearance between the bearing and the jacket, allowing the contact force from the side of the jacket to act on the bearing end, thus limiting the bearing's position, improving its accuracy, and reducing the cam's wobble angle. The maximum diameter of the shim matches the outer edge of the bearing's inner shaft to prevent the bearing's flexibility from being affected when the shaft is tightened.

[0010] Preferably, the sleeve has interlaced anti-slip texture inside, with a texture depth of 0.5±0.05mm and a texture density of 8 to 10 textures / cm². The anti-slip texture inside the sleeve improves the fit between the sleeve and the bow wall end, prevents the sleeve from loosening, and further enhances the anti-sway effect.

[0011] Preferably, the sleeve and the bow wall are bonded together with flexible adhesive. Adhesive can also be used to bond the sleeve to the end of the bow wall to improve the connection strength between the sleeve and the bow wall, and can also be used in conjunction with the anti-slip texture inside the sleeve.

[0012] Preferably, the cam has spokes inside, and the spokes are arranged along the internal rotation direction of the cam. The spoke design inside the cam can not only reduce the overall weight of the cam and achieve lightweighting of the compound bow, but also improve the structural strength of the cam and enhance its torsional resistance.

[0013] Preferably, the thickness of the bow wall end is greater than the thickness of the bow wall body. A larger thickness at the bow wall end increases the lateral surface area, allowing for the use of a larger clip, thus increasing the clamping contact area between the bow wall and the cam and reducing the cam's yaw angle.

[0014] Compared with the prior art, the beneficial effects of this utility model are: (1) reducing the degree of sway of the composite bow wheel assembly on the bow wall, reducing the sway angle, and improving the shooting effect; the sway amount is reduced by 82% (from the traditional 1.2mm to 0.2mm); (2) after testing, the stable re-pointing accuracy at a distance of 30 meters is improved to 180%; (3) the shaft system structure is innovative, the shaft system structure stiffness is enhanced, and the sway angle of the cam under the action of large torque is effectively reduced; (4) the cam adopts a spoke-type tie rod structure, and the torsional stiffness is greatly improved. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the composite bow structure of this utility model.

[0016] Figure 2 for Figure 1 An enlarged diagram of A in the diagram.

[0017] Figure 3 This is an exploded view of the bow wall end and the cam of this utility model.

[0018] In the diagram: 1. Cam, 2. Bow wall, 3. Jacket, 4. Shaft, 5. Bearing, 6. Bushing, 7. Washer, 8. Spoke, 9. Bow handle, 10. Shaft hole, 11. Connecting through hole, 12. Screw head, 13. Locking nut. Detailed Implementation

[0019] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Example 1: As Figures 1 to 3 The composite bow anti-sway structure shown includes a cam 1 and a bow wall 2. The bow wall 2 is a flexible connecting wall structure at both ends of the bow handle 9. Two sets of symmetrically arranged bow walls 2 are provided at both ends of the bow handle 9. The bow walls 2 at both ends of the bow handle 9 are also symmetrically arranged. In this embodiment, only the two sets of bow walls 2 on one side of the bow handle 9 are described.

[0021] Two bow walls 2 are spaced apart, and a cam 1 is arranged between the two bow walls 2 and located at the end of the bow wall 2 away from the bow handle 9. The cam 1 is rotatably connected to the ends of the two bow walls 2 through a rotating assembly. Specifically, the main body of the bow wall 2 has a flat rectangular cross-section. The thickness of the end of the bow wall 2 away from the bow handle 9 is greater than the thickness of the main body of the bow wall 2. The outer surface of the bow wall 2 (the outer sides of the compound bow) is a smooth arc surface, and the inner surface of the bow wall 2 (the inner sides of the compound bow) is thickened with a thickened block at the end position, thereby increasing the thickness of the end of the bow wall 2. The inner end of the bow wall 2 and the bow wall 2 have an arc transition. The increased thickness of the end of the bow wall 2 can effectively enhance the structural strength of the end of the bow wall 2, and at the same time increase the specific surface area of ​​the side of the end of the bow wall 2 and the hinge position of the cam 1, which plays a good role in limiting and preventing swaying.

[0022] Furthermore, a sleeve 3 structure is provided at the end of the bow wall 2. The sleeve 3 is a hollow cavity structure with a through hole on one side. The size of the sleeve 3 is adapted to the end of the bow wall 2 and it is a cuboid structure. The sleeve 3 can be fitted onto the end of the bow wall 2 through the through hole on one side, thereby further increasing the area of ​​the end of the bow wall 2, which means that it can increase the specific surface area between the end of the bow wall 2 and the rotating shaft of the cam 1. In addition, due to the arrangement of the sleeve 3, the gap between the two bow walls 2 is reduced, so that the side of the sleeve 3 facing the middle of the two bow walls 2 can contact the position of the rotating shaft of the cam 1. It is equivalent to adding a limiting ring or limiting step on both sides of the cam 1. The larger the ratio of the surface area between the sleeve 3 and the rotating shaft of the cam 1, the better the side blocking effect of the cam 1, that is, it can better prevent the cam 1 from swaying when the compound bow is used under force, reduce the sway angle of the cam 1, and improve the shooting effect.

[0023] Furthermore, the arrangement of the sleeve 3 not only increases the lateral area of ​​the bow wall 2, but also increases the width of the end of the bow wall 2, which means increasing the dimension of the end of the bow wall 2 along the rotation axis of the cam 1. A pivot hole 10 is provided on the bow wall 2, and connecting through holes 11 corresponding to and adapted to the pivot hole 10 are provided on both sides of the sleeve 3 laterally. When the sleeve 3 is installed on the outer side of the end of the bow wall 2, the connecting through holes 11 on the sleeve 3 and the pivot holes 10 on the bow wall 2 can be aligned perfectly, and the rotating component passes through the hole structures on both the bow wall 2 and the sleeve 3. Because the width dimension of the end of the bow wall 2 is increased under the action of the sleeve 3, it can also achieve a better axial positioning effect for the rotating component, effectively preventing the cam 1 from wobbling.

[0024] Among them, the jacket 3 is made of aluminum. Before the jacket 3 is assembled with the bow wall 2, it needs to be anodized to achieve a surface hardness of ≥500HV, thereby improving the durability of the jacket 3.

[0025] Example 2: Figures 1 to 3The composite bow anti-sway structure shown includes a cam 1 and a bow wall 2. The bow wall 2 is a flexible connecting wall structure at both ends of the bow handle 9. Two sets of symmetrically arranged bow walls 2 are provided at both ends of the bow handle 9. The bow walls 2 at both ends of the bow handle 9 are also symmetrically arranged. In this embodiment, only the two sets of bow walls 2 on one side of the bow handle 9 are described.

[0026] Two bow walls 2 are spaced apart, and a cam 1 is arranged between the two bow walls 2 and located at the end of the bow wall 2 away from the bow handle 9. The cam 1 is rotatably connected to the ends of the two bow walls 2 through a rotating assembly. Specifically, the main body of the bow wall 2 has a flat rectangular cross-section. The thickness of the end of the bow wall 2 away from the bow handle 9 is greater than the thickness of the main body of the bow wall 2. The outer surface of the bow wall 2 (the outer sides of the compound bow) is a smooth arc surface, and the inner surface of the bow wall 2 (the inner sides of the compound bow) is thickened with a thickened block at the end position, thereby increasing the thickness of the end of the bow wall 2. The inner end of the bow wall 2 and the bow wall 2 have an arc transition. The increased thickness of the end of the bow wall 2 can effectively enhance the structural strength of the end of the bow wall 2, and at the same time increase the specific surface area of ​​the side of the end of the bow wall 2 and the hinge position of the cam 1, which plays a good role in limiting and preventing swaying.

[0027] Furthermore, a sleeve 3 structure is provided at the end of the bow wall 2. The sleeve 3 is a hollow cavity structure with a through hole on one side. The size of the sleeve 3 is adapted to the end of the bow wall 2 and it is a cuboid structure. The sleeve 3 can be fitted onto the end of the bow wall 2 through the through hole on one side, thereby further increasing the area of ​​the end of the bow wall 2, which means that it can increase the specific surface area between the end of the bow wall 2 and the rotating shaft of the cam 1. In addition, due to the arrangement of the sleeve 3, the gap between the two bow walls 2 is reduced, so that the side of the sleeve 3 facing the middle of the two bow walls 2 can contact the position of the rotating shaft of the cam 1. It is equivalent to adding a limiting ring or limiting step on both sides of the cam 1. The larger the ratio of the surface area between the sleeve 3 and the rotating shaft of the cam 1, the better the side blocking effect of the cam 1, that is, it can better prevent the cam 1 from swaying when the compound bow is used under force, reduce the sway angle of the cam 1, and improve the shooting effect.

[0028] Furthermore, the arrangement of the sleeve 3 not only increases the lateral area of ​​the bow wall 2, but also increases the width of the end of the bow wall 2, which means increasing the dimension of the end of the bow wall 2 along the rotation axis of the cam 1. A pivot hole 10 is provided on the bow wall 2, and connecting through holes 11 corresponding to and adapted to the pivot hole 10 are provided on both sides of the sleeve 3 laterally. When the sleeve 3 is installed on the outer side of the end of the bow wall 2, the connecting through holes 11 on the sleeve 3 and the pivot holes 10 on the bow wall 2 can be aligned perfectly, and the rotating component passes through the hole structures on both the bow wall 2 and the sleeve 3. Because the width dimension of the end of the bow wall 2 is increased under the action of the sleeve 3, it can also achieve a better axial positioning effect for the rotating component, effectively preventing the cam 1 from wobbling.

[0029] Among them, the jacket 3 is made of aluminum. Before the jacket 3 is assembled with the bow wall 2, it needs to be anodized to achieve a surface hardness of ≥500HV, thereby improving the durability of the jacket 3.

[0030] The cam 1 adopts a hollow wheel structure, which can minimize the overall weight of the cam 1 and meet the lightweight requirements of the compound bow. In order to enhance the structural strength of the cam 1, several sets of spokes 8 are set inside the cam 1. The spokes 8 are radially distributed on the inner side of the cam 1. The distribution angle α of the spokes 8 satisfies 45°≤α≤60°, and the height h of the spokes 8 and the wheel diameter D satisfy h=0.12D±0.02D.

[0031] An anti-slip textured structure is also provided inside the sleeve 3. The anti-slip textures are staggered and distributed, with a depth of 0.5±0.05mm and a density of 8 to 10 textures / cm². The anti-slip textures can improve the assembly effect between the sleeve 3 and the end of the bow wall 2, prevent the sleeve 3 from loosening, and further improve the anti-sway effect. In addition, flexible adhesive can be used to bond the bow wall 2 and the sleeve 3, or a combination of the above two methods can be used to improve the connection strength between the sleeve 3 and the bow wall 2.

[0032] Example 3: As Figures 1 to 3 The composite bow anti-sway structure shown includes a cam 1 and a bow wall 2. The bow wall 2 is a flexible connecting wall structure at both ends of the bow handle 9. Two sets of symmetrically arranged bow walls 2 are provided at both ends of the bow handle 9. The bow walls 2 at both ends of the bow handle 9 are also symmetrically arranged. In this embodiment, only the two sets of bow walls 2 on one side of the bow handle 9 are described.

[0033] Two bow walls 2 are spaced apart, and a cam 1 is arranged between the two bow walls 2 and located at the end of the bow wall 2 away from the bow handle 9. The cam 1 is rotatably connected to the ends of the two bow walls 2 through a rotating assembly. Specifically, the main body of the bow wall 2 has a flat rectangular cross-section. The thickness of the end of the bow wall 2 away from the bow handle 9 is greater than the thickness of the main body of the bow wall 2. The outer surface of the bow wall 2 (the outer sides of the compound bow) is a smooth arc surface, and the inner surface of the bow wall 2 (the inner sides of the compound bow) is thickened with a thickened block at the end position, thereby increasing the thickness of the end of the bow wall 2. The inner end of the bow wall 2 and the bow wall 2 have an arc transition. The increased thickness of the end of the bow wall 2 can effectively enhance the structural strength of the end of the bow wall 2, and at the same time increase the specific surface area of ​​the side of the end of the bow wall 2 and the hinge position of the cam 1, which plays a good role in limiting and preventing swaying.

[0034] Furthermore, a sleeve 3 structure is provided at the end of the bow wall 2. The sleeve 3 is a hollow cavity structure with a through hole on one side. The size of the sleeve 3 is adapted to the end of the bow wall 2 and it is a cuboid structure. The sleeve 3 can be fitted onto the end of the bow wall 2 through the through hole on one side, thereby further increasing the area of ​​the end of the bow wall 2, which means that it can increase the specific surface area between the end of the bow wall 2 and the rotating shaft of the cam 1. In addition, due to the arrangement of the sleeve 3, the gap between the two bow walls 2 is reduced, so that the side of the sleeve 3 facing the middle of the two bow walls 2 can contact the position of the rotating shaft of the cam 1. It is equivalent to adding a limiting ring or limiting step on both sides of the cam 1. The larger the ratio of the surface area between the sleeve 3 and the rotating shaft of the cam 1, the better the side blocking effect of the cam 1, that is, it can better prevent the cam 1 from swaying when the compound bow is used under force, reduce the sway angle of the cam 1, and improve the shooting effect.

[0035] Furthermore, the arrangement of the sleeve 3 not only increases the lateral area of ​​the bow wall 2, but also increases the width of the end of the bow wall 2, which means increasing the dimension of the end of the bow wall 2 along the rotation axis of the cam 1. A pivot hole 10 is provided on the bow wall 2, and connecting through holes 11 corresponding to and adapted to the pivot hole 10 are provided on both sides of the sleeve 3 laterally. When the sleeve 3 is installed on the outer side of the end of the bow wall 2, the connecting through holes 11 on the sleeve 3 and the pivot holes 10 on the bow wall 2 can be aligned perfectly, and the rotating component passes through the hole structures on both the bow wall 2 and the sleeve 3. Because the width dimension of the end of the bow wall 2 is increased under the action of the sleeve 3, it can also achieve a better axial positioning effect for the rotating component, effectively preventing the cam 1 from wobbling.

[0036] Among them, the jacket 3 is made of aluminum. Before the jacket 3 is assembled with the bow wall 2, it needs to be anodized to achieve a surface hardness of ≥500HV, thereby improving the durability of the jacket 3.

[0037] The rotating assembly includes a shaft 4, a bearing 5, a bushing 6, and a washer 7. Specifically, the shaft 4 is a hollow shaft structure made of aluminum. The shaft 4 is equivalent to a bolt structure, with a threaded head 12 at one end and a threaded lock nut 13 at the other end. The shaft 4 passes laterally through the two arch walls 2 and the cam 1 located between the two arch walls 2, allowing the cam 1 to rotate on the shaft 4 and relative to the two arch walls 2.

[0038] Furthermore, the shaft 4 is equipped with a bushing 6, a bearing 5, and a shim 7. These components are symmetrically arranged about both sides of the cam 1. That is, there are two sets of bearings 5 ​​and shims 7 on the cam 1, but only one bushing 6 is located inside the cam 1. Specifically, the bushing 6, bearing 5, and shim 7 are all located inside the shaft hole of the cam 1. The bushing 6 is located in the middle of the cam 1, while the bearing 5 and shim 7 are arranged sequentially on both sides of the bushing 6. The bearings 5 ​​on both sides of the cam 1 distribute the double-chord tension on the cam 1 across the two sets of bearings 5, effectively preventing cam 1 from wobbling while distributing the load. The bushing 6 prevents the bearing 5 from deforming during tightening and pressing on both sides, thus affecting its function. The shim 7 adjusts the gap between the bearing 5 and the sleeve 3, allowing the contact force on the side of the sleeve 3 to act on the end of the bearing 5, thus limiting the bearing 5's position and improving its accuracy, while reducing the wobbling angle of the cam 1. This arrangement can enhance the shaft stiffness of cam 1 and also improve the yaw rate under high torque conditions of the compound bow.

[0039] The shaft 4 is nitrided (hardness ≥ 800HV); the distance between the two bearings 5 ​​is greater than 15mm, and the axial clearance is controlled between 0.02 and 0.03mm; when the locking nut 13 is connected to the shaft 4, 271 anaerobic adhesive (0.05±0.01ml) is applied to the threaded part and cured for 24h at room temperature.

[0040] The cam 1 adopts a hollow wheel structure, which can minimize the overall weight of the cam 1 and meet the lightweight requirements of the compound bow. In order to enhance the structural strength of the cam 1, several sets of spokes 8 are set inside the cam 1. The spokes 8 are radially distributed on the inner side of the cam 1. The distribution angle α of the spokes 8 satisfies 45°≤α≤60°, and the height h of the spokes 8 and the wheel diameter D satisfy h=0.12D±0.02D.

[0041] An anti-slip textured structure is also provided inside the sleeve 3. The anti-slip textures are staggered and distributed, with a depth of 0.5±0.05mm and a density of 8 to 10 textures / cm². The anti-slip textures can improve the assembly effect between the sleeve 3 and the end of the bow wall 2, prevent the sleeve 3 from loosening, and further improve the anti-sway effect. In addition, flexible adhesive can be used to bond the bow wall 2 and the sleeve 3, or a combination of the above two methods can be used to improve the connection strength between the sleeve 3 and the bow wall 2.

Claims

1. A composite bow anti-sway structure, comprising bow walls disposed on both sides of a cam, wherein the cam is rotatably connected between the ends of the two bow walls, characterized in that, A rotating assembly is provided between the cam and the bow wall, and a sleeve adapted to the end of the bow wall is provided at the end of the bow wall. The rotating assembly passes through the cam and the two bow walls, and makes the cam and the sleeve on the bow wall rotatably connected.

2. The compound bow anti-canting structure of claim 1, wherein, The rotating assembly includes a shaft, which is a hollow shaft, and the shaft passes through the two bow walls and the cam.

3. The compound bow anti-canting structure of claim 2, wherein, The rotating assembly includes bearings symmetrically arranged on both sides of the cam, and the bearings are mounted on the shaft.

4. The compound bow anti-cambering structure of claim 3, wherein, The shaft is also provided with a bushing, which is located inside the cam and between the two bearings.

5. The compound bow anti-cambering structure of claim 3, wherein, A gasket is also provided between the bearing and the jacket, and the diameter of the gasket is smaller than the diameter of the inner ring of the bearing.

6. The compound bow anti-cambering structure of any one of claims 1-5, wherein, The jacket has an interlaced anti-slip texture inside, with a depth of 0.5±0.05mm and a density of 8 to 10 textures / cm².

7. A composite bow anti-sway structure according to any one of claims 1 to 5, characterized in that, The jacket is bonded to the bow wall with flexible adhesive.

8. The compound bow anti-canting structure according to any one of claims 1 to 5, characterized in that, The cam has spokes inside, and the spokes are arranged along the internal rotation direction of the cam.

9. The compound bow anti-cambering structure of any one of claims 1-5, wherein, The thickness of the bow wall end is greater than the thickness of the bow wall body.

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