Shaft hole connecting structure

Abstract

The utility model discloses a shaft hole connecting structure which comprises a first shaft and a first hole sleeved on the first shaft, the first shaft and the first hole are respectively arranged on two parts, the shaft hole connecting structure further comprises a first lining and a fastening assembly, the end portion of the first hole is provided with an inner conical surface, the side wall of the first lining is provided with at least one notch, and the fastening assembly is arranged on the first lining. The outer wall of the first bush is provided with an outer conical surface, the first bush is arranged on the first shaft in a sleeving mode, the outer conical surface is matched with the inner conical surface in an abutting mode, and the fastening assembly drives the first bush to be close to the first hole so that the inner conical surface can extrude the first bush to shrink in the radial direction to clamp the first shaft. The shaft hole connecting structure can enable the shaft holes to be tightly matched, is convenient to disassemble and assemble, and has the advantages that the occupied space is small, the shaft holes can be kept concentric, and the machining cost of the shaft holes is low.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical connection and transmission structures, and particularly relates to a shaft-hole connection structure. Background Art

[0002] In mechanical structures, there are three types of shaft-hole fits: interference fit, transition fit, and clearance fit. Among these three fits, the clearance fit is relatively convenient for installation and disassembly. However, for the transition fit and interference fit, both installation and disassembly are relatively difficult. To achieve the disassembly and assembly of the transition fit and interference fit, special tools or special processes are usually required, and certain proficiency in disassembly and assembly is also required, which increases the disassembly and assembly cost and is not suitable for users to disassemble and assemble by themselves.

[0003] Generally, especially for metal shaft-hole fits, even for clearance fits, after being used for a period of time or being externally corroded, they may be oxidized, resulting in the tightening of the clearance, making disassembly difficult. The interference fit and transition fit are even more difficult to disassemble.

[0004] In order to make the shaft-hole both convenient for disassembly and assembly and ensure a tight fit, common solutions are as follows: 1. Using a conical fit to eliminate the shaft-hole clearance; 2. Using a shrink disc for connection; 3. Using a radial set screw method; 4. Fixing by other complex expansion methods.

[0005] However, for the first solution above, the taper accuracy requirements for the shaft and hole are relatively high, and the processing cost is high. The second solution is not applicable to the case where the hole-bearing component is directly installed on the shaft and can only be fixed by an extended method, occupying a large space. The third solution will cause shaft-hole eccentricity and limited torque transmission. The fourth solution has many components, a complex structure, and a high cost. Summary of the Utility Model

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a shaft-hole connection structure, which can achieve a tight fit between the shaft and the hole, is convenient for disassembly and assembly, and has the advantages of small occupied space, concentricity of the shaft and hole, and low processing cost of the shaft and hole.

[0007] An axial hole connection structure according to an embodiment of the present utility model includes a first shaft and a first hole sleeved on the first shaft. The first shaft and the first hole are respectively arranged on two components, and further includes a first bushing and a fastening component. The end of the first hole has an inner conical surface, the side wall of the first bushing has at least one notch, the outer wall of the first bushing has an outer conical surface, the first bushing is sleeved on the first shaft, the outer conical surface is in abutting fit with the inner conical surface, and the fastening component drives the first bushing close to the first hole so that the inner conical surface squeezes the first bushing to radially contract and clamp the first shaft.

[0008] An axial hole connection structure according to an embodiment of the present utility model, both ends of the first hole have inner conical surfaces, two first bushings are provided, and the two first bushings are respectively in cooperation with the two inner conical surfaces.

[0009] An axial hole connection structure according to an embodiment of the present utility model, the first shaft includes a shaft extension and a shaft shoulder. The shaft extension is in cooperation with the first hole, the shaft shoulder is arranged at one end of the shaft extension, the shaft shoulder abuts and squeezes against one first bushing, and the fastening component abuts and squeezes against the other first bushing.

[0010] An axial hole connection structure according to an embodiment of the present utility model, the outer diameter of the shaft shoulder is greater than the inner diameter of the first bushing and less than the opening end diameter of the outer conical surface.

[0011] An axial hole connection structure according to an embodiment of the present utility model, the first shaft further includes a threaded portion, the threaded portion is arranged at one end of the shaft extension away from the shaft shoulder, the fastening component includes a nut, and the nut is in threaded connection with the threaded portion.

[0012] An axial hole connection structure according to an embodiment of the present utility model, the fastening component further includes a washer, and the washer is arranged between the nut and the first bushing.

[0013] An axial hole connection structure according to an embodiment of the present utility model, the outer diameter of the washer is greater than the inner diameter of the first bushing and less than the opening end diameter of the outer conical surface.

[0014] An axial hole connection structure according to an embodiment of the present utility model, the distance between the two end faces of the two first bushings away from each other is greater than the length of the shaft extension.

[0015] An axial hole connection structure according to an embodiment of the present utility model, a shaft keyway is arranged on the outer circumferential surface of the shaft extension, a hole keyway is arranged on the inner wall of the first hole, a first key is arranged between the shaft keyway and the hole keyway, and the shaft keyway, the hole keyway and the first key cooperate to prevent rotation.

[0016] According to an axial hole connection structure of an embodiment of the present utility model, the first bushing includes at least two semi-circular bushings, and a gap between ends of two adjacent semi-circular bushings forms the notch.

[0017] An axial hole connection structure according to an embodiment of the present utility model has at least the following beneficial effects:

[0018] 1. In the present utility model, by providing a first shaft and a first hole sleeved on the first shaft, the first shaft and the first hole are respectively arranged on two components, so that the two components can cooperate with each other through the first shaft and the first hole.

[0019] 2. In the present utility model, by providing a first bushing and a fastening assembly, an inner conical surface is provided at an end of the first hole, at least one notch is provided on a side wall of the first bushing, an outer conical surface is provided on an outer wall of the first bushing, the first bushing is sleeved on the first shaft, the outer conical surface is in abutting fit with the inner conical surface, and the fastening assembly drives the first bushing to approach the first hole so that the inner conical surface squeezes the first bushing to radially contract and clamp the first shaft. It can be understood that when an axial pressure is applied to the first bushing by the fastening device, the outer conical surface of the first bushing is squeezed by the inner conical surface of the first hole, so that the notch gap of the first bushing becomes smaller, the inner hole diameter of the first bushing becomes smaller to clamp the first shaft, and at the same time, the first hole is expanded. Thus, a tight fit is achieved between the shaft and the hole. Moreover, when the first bushing contracts and clamps the first shaft, the cooperation between the inner conical surface and the outer conical surface can keep the first hole, the first bushing and the first shaft concentric, so that the shaft and hole fit concentrically. At the same time, when the fastening device releases the first bushing, affected by the cooperation between the inner conical surface and the outer conical surface and the elasticity of the first bushing, the first bushing can automatically release the connection with the first shaft and the first hole. Thus, the axial hole connection structure is convenient to disassemble and assemble. In addition, the axial hole connection structure clamps the first shaft by the contraction of the first bushing, has low requirements for the taper accuracy of the inner conical surface and the outer conical surface, and has low processing cost. Furthermore, since both the first bushing and the fastening assembly are arranged on the first shaft and do not need to be fixed by an outstretched manner, the occupied space of the axial hole connection structure is small.

[0020] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 Structural schematic diagram of a shaft-hole connection structure according to an embodiment of the present invention;

[0023] Figure 2 is Figure 1 exploded view of the parts shown;

[0024] Figure 3 is Figure 1 structural schematic diagram of the first shaft shown;

[0025] Figure 4 is Figure 1 axial sectional view of the first hole shown;

[0026] Figure 5 is Figure 1 structural schematic diagram of the first bushing shown;

[0027] Figure 6 is Figure 1 structural schematic diagram of the first bushing of another embodiment shown;

[0028] Figure 7 is Figure 1 comparative diagram of the force deformation of the first bushing shown.

[0029] Reference numerals: 100 - first shaft, 110 - first hole, 120 - first bushing, 130 - fastening assembly, 140 - inner conical surface, 150 - notch, 160 - outer conical surface, 170 - shaft extension, 180 - shaft shoulder, 190 - threaded portion, 200 - nut, 210 - washer, 220 - shaft keyway, 230 - hole keyway, 240 - first key, 250 - semi-circular bushing. Detailed implementation manners

[0030] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0031] In the description of the present utility model, it should be understood that regarding the orientation description, for example, the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0032] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more. Understanding greater than, less than, exceeding, etc. does not include the present number, and understanding above, below, within, etc. includes the present number. If there is a description of first and second, this is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation, connection and coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] The following describes a shaft-hole connection structure according to an embodiment of the present utility model with reference to the drawings.

[0035] Refer to Figure 1 , the present utility model aims to provide an embodiment of a shaft-hole connection structure.

[0036] In this embodiment, a shaft-hole connection structure mainly includes a first shaft 100 and a first hole 110 sleeved on the first shaft 100. The first shaft 100 and the first hole 110 are respectively arranged on two components, so that the two components can cooperate with each other through the first shaft 100 and the first hole 110.

[0037] Refer to Figure 2 , this example is described by the installation method of the wheel and the drive axle shaft, where the first shaft 100 is the output shaft of the drive axle and the first hole 110 is the inner hole of the wheel.

[0038] It should be noted that in this embodiment, the first hole 110 takes the inner hole of a wheel as an example, which does not mean that the present utility model is only applied to the connection between a wheel and a shaft. It can also be applied to the connection between various hole-containing parts such as gears, pulleys, sprockets, and bearings and a shaft. In this embodiment, the shaft takes the output shaft of a drive axle as an example, which does not mean that the present utility model is only applied to the connection between the output shaft of a drive axle and a wheel. It can also be applied to other gear rotating shafts, belt transmission shafts, sprocket shafts, bearing shafts, wheel shafts, etc.

[0039] In some specific embodiments, the shaft-hole connection structure further includes a first bushing 120 and a fastening assembly 130. The end of the first hole 110 has an inner conical surface 140. The side wall of the first bushing 120 has at least one notch 150. The outer wall of the first bushing 120 has an outer conical surface 160. The first bushing 120 is sleeved on the first shaft 100. The outer conical surface 160 is in abutting fit with the inner conical surface 140. The fastening assembly 130 drives the first bushing 120 to approach the first hole 110 so that the inner conical surface 140 squeezes the first bushing 120 to radially contract and clamp the first shaft 100.

[0040] It can be understood that when the fastening device applies an axial pressure to the first bushing 120, the outer conical surface 160 of the first bushing 120 is squeezed by the inner conical surface 140 of the first hole 110, so that the gap of the notch 150 of the first bushing 120 becomes smaller, the inner hole diameter of the first bushing 120 becomes smaller to clamp the first shaft 100, and at the same time, the first hole 110 is expanded. Thus, a tight fit is achieved between the shaft and the hole. And when the first bushing 120 contracts to clamp the first shaft 100, the fit between the inner conical surface 140 and the outer conical surface 160 can keep the first hole 110, the first bushing 120, and the first shaft 100 concentric, making the shaft-hole fit concentric. At the same time, when the fastening device releases the first bushing 120, affected by the fit between the inner conical surface 140 and the outer conical surface 160 and the elasticity of the first bushing 120, the first bushing 120 can automatically release the connection with the first shaft 100 and the first hole 110. Thus, the shaft-hole connection structure is convenient to disassemble and assemble. In addition, the shaft-hole connection structure clamps the first shaft 100 through the contraction of the first bushing 120, has low requirements for the taper accuracy of the inner conical surface 140 and the outer conical surface 160, and has low processing costs. Moreover, since both the first bushing 120 and the fastening assembly 130 are arranged on the first shaft 100 and do not need to be fixed by an extended method, the occupied space of the shaft-hole connection structure is small.

[0041] In some specific embodiments, both ends of the first hole 110 have inner conical surfaces 140. Two first bushings 120 are provided. The two first bushings 120 are respectively matched with the two inner conical surfaces 140. Thus, the force balance between the first shaft 100 and the first hole 110 is achieved, and the first shaft 100 and the first hole 110 are prevented from tilting relative to each other due to unbalanced force.

[0042] Refer to Figure 3 、 Figure 4 and Figure 5 In some specific embodiments, the first shaft 100 includes a shaft extension 170 and a shaft shoulder 180. The shaft extension 170 is engaged with the first hole 110. The shaft shoulder 180 is disposed at one end of the shaft extension 170. The shaft shoulder 180 abuts and presses against one first bushing 120, and the fastening assembly 130 abuts and presses against the other first bushing 120. Thus, the shaft shoulder 180 can press one first shaft 100 sleeve, and at the same time, the shaft shoulder 180 can cooperate with the fastening assembly 130 to press the two first bushings 120 closer to each other.

[0043] Furthermore, the outer diameter of the shaft shoulder 180 is greater than the inner diameter of the first bushing 120 and less than the opening end diameter of the outer conical surface 160.

[0044] It can be understood that the outer diameter of the shaft shoulder 180 is greater than the inner diameter of the first bushing 120, so that the shaft shoulder 180 can abut and limit the end face of the first bushing 120. At the same time, the outer diameter of the shaft shoulder 180 is less than the opening end diameter of the outer conical surface 160, so that the shaft shoulder 180 can avoid the opening end of the outer conical surface 160 and prevent the opening end of the outer conical surface 160 from interfering with the shaft shoulder 180, resulting in the shaft shoulder 180 being unable to press the first bushing 120 towards the direction close to the first hole 110.

[0045] In some specific embodiments, the first shaft 100 further includes a threaded portion 190. The threaded portion 190 is disposed at the end of the shaft extension 170 away from the shaft shoulder 180. The fastening assembly 130 includes a nut 200. The nut 200 is threadedly connected to the threaded portion 190. Thus, through the threaded cooperation between the nut 200 and the threaded portion 190, the first bushing 120 can be quickly locked and loosened, and further, the disassembly and assembly of the shaft-hole connection structure are facilitated.

[0046] Furthermore, the fastening assembly 130 further includes a washer 210. The washer 210 is disposed between the nut 200 and the first bushing 120. Thus, the washer 210 can support the first shaft 100 sleeve.

[0047] In some specific embodiments, the outer diameter of the washer 210 is greater than the inner diameter of the first bushing 120 and less than the opening end diameter of the outer conical surface 160.

[0048] It can be understood that the outer diameter of the washer 210 is greater than the inner diameter of the first bushing 120, so that the washer 210 can abut and limit the end face of the first bushing 120. At the same time, the outer diameter of the washer 210 is less than the opening end diameter of the outer conical surface 160, so that the washer 210 can avoid the opening end of the outer conical surface 160 and prevent the opening end of the outer conical surface 160 from interfering with the washer 210, resulting in the washer 210 being unable to press the first bushing 120 towards the direction close to the first hole 110.

[0049] In some specific embodiments, the distance between the two end faces of the two first bushings 120 that are away from each other is greater than the length of the shaft extension 170, so as to prevent the shaft extension 170 from contacting the washer 210 and interfering with the movement of the washer 210.

[0050] In some specific embodiments, a shaft keyway 220 is provided on the outer cylindrical surface of the shaft extension 170, a hole keyway 230 is provided on the inner wall of the first hole 110, and a first key 240 is provided between the shaft keyway 220 and the hole keyway 230. The shaft keyway 220, the hole keyway 230 and the first key 240 cooperate to prevent rotation, so as to make the transmission between the drive axle and the wheel more stable.

[0051] Refer to Figure 6 , in some other embodiments, the first bushing 120 includes at least two semi-circular bushings 250, and a gap is formed between the ends of two adjacent semi-circular bushings 250 to form a notch 150, so as to facilitate the processing and manufacturing of the first bushing 120.

[0052] In some specific embodiments, by reducing the mating taper of the outer conical surface 160 and the inner conical surface 140, the fastening degree between the first hole 110 and the first shaft 100 can be increased. In addition, by increasing the mating taper of the outer conical surface 160 and the inner conical surface 140, the ease of disassembly can be improved.

[0053] During the installation of this embodiment, first install one of the first bushings 120 on the first shaft 100, with the large outer diameter end face of the first bushing 120 facing the direction of the shaft shoulder 180. Then install the first hole 110 of the wheel on the first shaft 100, adjust the wheel so that the shaft keyway 220 is aligned with the hole keyway 230, then insert the first key 240, and then install the other first bushing 120 on the first shaft 100, with the large outer diameter end face of the first bushing 120 facing the threaded portion 190. Then install the washer 210 and the nut 200. After locking the nut 200, the wheel is installed.

[0054] During the process of locking the nut 200, the nut 200 pushes the washer 210 to generate an axial pressure on the first bushing 120. The first bushing 120 pushes the wheel towards the shaft shoulder 180 until it stops moving due to the resistance of the shaft shoulder 180. The nut 200 continues to apply pressure. Since the first bushing 120 is restricted by the shaft shoulder 180 and cannot move further, the outer conical surfaces 160 of the two first bushings 120 are squeezed against the two inner conical surfaces 140 of the first hole 110, and the locking force is decomposed into the tension between the first bushing 120 and the inner conical surface 140 of the first hole 110 and the centripetal squeezing force of the inner conical surface 140 of the first hole 110 on the first bushing 120.

[0055] Refer to Figure 7, under the influence of the reaction force of the inner conical surface 140 of the first hole 110 on the outer conical surface 160 of the first bushing 120, under the action of the extrusion force, the size of the notch 150 of the first bushing 120 is reduced, the inner hole diameter of the first bushing 120 is reduced until the first bushing 120 clamps the first shaft 100. Then, the force applied by continuously tightening the nut 200 will continue to be converted into the tension force of the first bushing 120 on the inner conical surface 140 of the first hole 110 and the flat tightening force on the first shaft 100, so as to ensure the tight connection between the first hole 110 and the first shaft 100.

[0056] In the description of this specification, the description with reference to terms such as "one embodiment, some embodiments, illustrative embodiments, examples, specific examples or some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0057] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art to which it pertains, various changes can also be made without departing from the gist of the present utility model.

Claims

1. A shaft-hole connection structure, comprising a first shaft (100), and a first hole (110) sleeved on the first shaft (100), wherein the first shaft (100) and the first hole (110) are respectively arranged on two components, characterized in that: The invention also includes a first bushing (120) and a fastening assembly (130), wherein the end of the first hole (110) has an inner conical surface (140), the side wall of the first bushing (120) has at least one notch (150), the outer wall of the first bushing (120) has an outer conical surface (160), the first bushing (120) is sleeved on the first shaft (100), the outer conical surface (160) is abutted against the inner conical surface (140), and the fastening assembly (130) drives the first bushing (120) to approach the first hole (110) so that the inner conical surface (140) squeezes the first bushing (120) to radially contract and clamp the first shaft (100).

2. The shaft-hole connection structure according to claim 1, characterized in that: Both ends of the first hole (110) have the inner conical surface (140), two first bushings (120) are provided, and the two first bushings (120) are respectively matched with the two inner conical surfaces (140).

3. The shaft-hole connection structure according to claim 2, characterized in that: The first shaft (100) comprises a shaft extension (170) and a shaft shoulder (180), the shaft extension (170) cooperates with the first hole (110), the shaft shoulder (180) is arranged at one end of the shaft extension (170), the shaft shoulder (180) abuts and presses against one of the first bushings (120), and the fastening assembly (130) abuts and presses against another of the first bushings (120).

4. The shaft-hole connection structure according to claim 3, characterized in that: The outer diameter of the shaft shoulder (180) is greater than the inner diameter of the first bushing (120) and smaller than the diameter of the opening end of the outer conical surface (160).

5. The shaft-hole connection structure according to claim 3, characterized in that: The first shaft (100) further comprises a threaded portion (190), the threaded portion (190) being arranged at an end of the shaft extension (170) away from the shaft shoulder (180), and the fastening assembly (130) comprises a nut (200), the nut (200) being threadedly connected to the threaded portion (190).

6. The shaft-hole connection structure according to claim 5, characterized in that: The fastening assembly (130) further comprises a washer (210), wherein the washer (210) is disposed between the nut (200) and the first bushing (120).

7. The shaft-hole connection structure according to claim 6, characterized in that: The outer diameter of the gasket (210) is greater than the inner diameter of the first bushing (120) and smaller than the diameter of the opening end of the outer conical surface (160).

8. The shaft-hole connection structure according to claim 6, characterized in that: The distance between two end surfaces of the two first bushings (120) that are away from each other is greater than the length of the shaft extension (170).

9. The shaft-hole connection structure according to claim 3, characterized in that: The outer cylindrical surface of the shaft extension (170) is provided with a shaft keyway (220), the inner wall of the first hole (110) is provided with a hole keyway (230), the shaft keyway (220) and the hole keyway (230) bracket are provided with a first key (240), and the shaft keyway (220), the hole keyway (230) and the first key (240) cooperate to prevent rotation.

10. The shaft-hole connection structure according to claim 1, characterized in that: The first bushing (120) comprises at least two semicircular bushings (250), and the gap between the ends of two adjacent semicircular bushings (250) forms the notch (150).

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