A shaft end connection structure

Abstract

The utility model relates to a kind of shaft end connecting structure, including first shaft, second shaft, at least one gap part is set to the one end of first shaft, gap part forms first mouth on its peripheral surface, forms second mouth on its end surface;The one end of second shaft is provided with first protruding part;Connecting structure further includes fastening block, when first shaft, second shaft are connected: first protruding part, fastening block are inserted in gap part simultaneously, and the sum of the width of first protruding part, fastening block is consistent with the width of first mouth.The utility model passes through the connecting mode of optimization shaft end, effectively solved the problem that end surface key transmission torque cannot bear heavy load and impact load, new structure can be applied to transmission heavy load and the scene with impact load;Effectively solved the problem that end surface key is prone to uneven stress due to machining deviation, ensure that each contact position of component is in stress state;Solve the problem of axial fixation relying on screw, the length and structure of connecting shaft are no longer limited, and installation is simplified.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically to a connection structure, and in particular to a shaft end connection structure. Background Technology

[0002] Shafts are commonly used parts in the machining field and are widely used in various scenarios. Often, due to structural requirements, processing, installation, and other factors, two shaft sections are spliced ​​together. To ensure the stability of the torque transmitted by the shaft, the following two connection methods are generally used: Method 1: Install end face keys on the end faces of the two shafts, such as... Figure 1 As shown, its working principle is as follows: the power component drives the spindle to rotate, and the connecting shaft is fixed by a flat key on the end face, achieving synchronous rotation with the spindle. Although this structure has advantages such as simple structure and easy installation, its disadvantages are also obvious. First, its load-bearing capacity is relatively low, making it unsuitable for heavy loads and impact loads, thus limiting its application range. Second, it requires extremely high machining accuracy; if two or more keys are used for connection, it is very easy to cause uneven force distribution among the keys.

[0003] Method 2: Install end face keys on the end faces of the two shafts and then fix them with axially mounted screws, such as... Figure 2 As shown, its working principle is as follows: the power component drives the spindle to rotate, and the connecting shaft is fixed by an end face key and screws, achieving synchronous rotation with the spindle. Although this structure is widely used, the length and structure of the connecting shaft are limited because it needs to be fixed axially. If the length of the connecting shaft is too long, it can easily lead to a decrease in structural strength and an increase in processing costs. Summary of the Invention

[0004] The purpose of this invention is to provide a shaft end connection structure.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A shaft end connection structure includes a first shaft and a second shaft. One end of the first shaft has at least one notch, with a first opening on its circumferential surface and a second opening on its end face. One end of the second shaft has a first protrusion. The connection structure also includes a fastening block. When the first shaft and the second shaft are connected, the first protrusion and the fastening block are simultaneously inserted into the notch, and the sum of the widths of the first protrusion and the fastening block is the same as the width of the first opening.

[0006] Preferably, in the above technical solution, the notch portion has a first side and a second side disposed opposite to each other, the first protrusion portion has a first side and a second side located on both sides, the fastening block has a first side and a second side located on both sides, and when the first shaft and the second shaft are connected: the first side of the notch portion fits against the first side of the first protrusion portion, the second side of the first protrusion portion fits against the first side of the fastening block, and the second side of the fastening block fits against the second side of the notch portion.

[0007] More preferably, the first and second sides of the notch are parallel.

[0008] More preferably, the first and second sides of the notch both extend axially toward the first axis.

[0009] More preferably, at least one of the first side and the second side of the notch is provided with a limiting structure, and when the first shaft and the second shaft are connected, the limiting structure can restrict the first protrusion from axially disengaging from the notch.

[0010] More preferably, the limiting structure is an inclined surface.

[0011] Preferably, in the above technical solution, the fastening block is provided as a single unit, or the fastening block is composed of multiple components spliced ​​together, and accurate fixing within each notch is achieved by adjusting the width of the matching fastening block.

[0012] Preferably, the fastening block includes a first component and a second component, which are connected by a connector. The overall width of the first component and the second component is adjustable. Due to the application of the first component and the second component, the requirements for processing accuracy of this structure can be appropriately reduced, and processing can be completed without special equipment.

[0013] More preferably, the opposing surfaces of the first and second components are at least partially inclined surfaces, and the paired inclined surfaces have adjustment and self-locking functions. By replacing the matching first and second components, radial and axial fine adjustments can be achieved, solving the problems of axial fixing, processing and installation errors.

[0014] Preferably, in the above technical solution, a groove is provided at one end of the first shaft; a second protrusion is provided at one end of the second shaft. When the first shaft and the second shaft are connected, the second protrusion is inserted into the groove, and the radial cross-section of the groove and the second protrusion is circular. The groove and the second protrusion can further cooperate to improve the connection strength of the first shaft and the second shaft.

[0015] More preferably, the groove is located in the middle of the first shaft, and the second protrusion is located in the middle of the second shaft.

[0016] More preferably, the distance by which the second protrusion protrudes from one end of the second shaft is greater than the distance by which the first protrusion protrudes from one end of the second shaft, and the more protruding second protrusion is inserted into the groove before the first protrusion, thus serving as a connecting guide.

[0017] Preferably, in the above technical solution, the number of notches is 2 to 6, and the number of first protrusions is the same as the number of notches; The notches are evenly distributed, and the position of the first protrusion corresponds to the position of the notches.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This invention effectively solves the problem that the end face key cannot withstand heavy loads and impact loads when transmitting torque by optimizing the connection method of the shaft end. The new structure can be applied to scenarios that transmit heavy loads and impact loads. This invention can effectively solve the problem of uneven stress caused by machining deviations in the end face key, ensuring that every contact point of the component is under stress. This invention solves the problem of axial fixation relying on screws, freeing the connection shaft from limitations in length and structure, and simplifying installation. Attached Figure Description

[0019] Appendix Figure 1 A three-dimensional schematic diagram of a prior art technique in which two shaft segments are connected by an end face key mounted on the end face. Appendix Figure 2 This is a three-dimensional schematic diagram of a prior art technique in which two shafts are fixed together by mounting end face keys on the end faces and then using axial mounting screws. Appendix Figure 3 This is a three-dimensional schematic diagram of the first shaft, second shaft, and fasteners in Embodiment 1 when they are not connected; Appendix Figure 4 This is a three-dimensional schematic diagram of the first axis and the second axis after they are connected in Embodiment 1; Appendix Figure 5 This is a three-dimensional schematic diagram of the first shaft, second shaft, and fasteners connected in Embodiment 1; Appendix Figure 6 This is a cross-sectional view of the first shaft, second shaft, and fasteners connected in Embodiment 1. Appendix Figure 7 This is a three-dimensional schematic diagram of the first and second axes after they are connected in Embodiment 2; Appendix Figure 8This is a cross-sectional view of the first shaft, the second shaft, and the fasteners after they are connected in Embodiment 2; Appendix Figure 9 This is a three-dimensional schematic diagram of the first shaft, the second shaft, and the fasteners in Embodiment 3 when they are not connected; Appendix Figure 10 This is a three-dimensional schematic diagram of the connection between the first and second axes in Embodiment 3. Figure 1 ; Appendix Figure 11 This is a three-dimensional schematic diagram of the connection between the first and second axes in Embodiment 3. Figure 2 ; Appendix Figure 12 This is a three-dimensional schematic diagram of the first shaft, the second shaft, and the fasteners connected in Embodiment 3; Appendix Figure 13 This is a front view schematic diagram of the first shaft, second shaft, and fasteners after they are connected in Embodiment 3 (the limiting structure is an inclined plane). Appendix Figure 14 This is a front view schematic diagram of the first shaft, second shaft, and fasteners connected in Embodiment 3 (the limiting structure is a stepped surface). Appendix Figure 15 This is a three-dimensional schematic diagram of the first and second axes after they are connected in Example 4.

[0020] In the attached diagrams above: 1. First shaft; 10. Notch; 100. First opening; 101. Second opening; 102. First side surface; 103. Second side surface; 104. Inclined surface; 105. Stepped surface; 11. Groove; 2. Second shaft; 20. First protrusion; 200. First side surface; 201. Second side surface; 202. Inclined surface; 21. Second protrusion; 3. Fastening block; 30. First side surface; 31. Second side surface; 3a. First component; 3b. Second component; 3c. Connector; 32. Inclined surface; 40. Spindle; 41. Connecting shaft; 42. Key; 43. Screw. Detailed Implementation

[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] Example 1: like Figure 3-6 The shaft end connection structure shown includes a first shaft 1, a second shaft 2, and a fastening block 3. The following is a detailed description of each component.

[0024] The first shaft 1 is a cylindrical shaft. At least one notch 10 is provided at one end of the first shaft 1. The notch 10 forms a first opening 100 on its circumferential surface and a second opening 101 on its end face. The number of notches 10 is 2 to 6, and the illustration shows 4 notches as an example. The notches 10 are evenly distributed. The notch 10 has a first side surface 102 and a second side surface 103 that are arranged opposite to each other. The first side surface 102 and the second side surface 103 of the notch 10 are parallel. In the illustration, the first side surface 102 and the second side surface 103 of the notch 10 both extend axially toward the first shaft 1.

[0025] A groove 11 is provided at one end of the first shaft 1. The radial cross section of the groove 11 is circular. The groove 11 is located in the middle of the first shaft 1, that is, the notch 10 is located around the groove 11. In the figure, the groove 11 is connected to the notch 10, and the depth of the groove 11 is deeper than the depth of the notch 10 on the second opening 101.

[0026] The second shaft 2 is also a cylindrical shaft. One end of the second shaft 2 is provided with a first protrusion 20. The number of first protrusions 20 is the same as the number of notches 10, that is, 2 to 6. The illustration also shows 4. The position of the first protrusions 20 corresponds to the position of the notches 10. The first protrusions 20 have a first side surface 200 and a second side surface 201 located on both sides. Similarly, the first side surface 200 and the second side surface 201 of the first protrusions 20 are also parallel. In the illustration, the first side surface 200 and the second side surface 201 of the first protrusions 20 both extend towards the axial direction of the second shaft 2, and the width of the first protrusion 20 is smaller than the width of the first opening 100.

[0027] A second protrusion 21 is provided at one end of the second shaft 2. The radial cross section of the second protrusion 21 is also circular. The second protrusion 21 is located in the middle of the second shaft 2, that is, the first protrusion 20 is located around the second protrusion 21. The distance from which the second protrusion 21 protrudes from one end of the second shaft 2 is greater than the distance from which the first protrusion 20 protrudes from one end of the second shaft.

[0028] The fastening block 3 is provided with a first side 30 and a second side 31 located on both sides, and the sum of the widths of the first protrusion 21 and the fastening block 3 is the same as the width of the first opening 100.

[0029] The connection method of this embodiment is described in detail below: like Figure 3 As shown, first align the ends of the first shaft 1 and the second shaft 2, insert the second protrusion 21 into the groove 11, and insert the first protrusion 20 into the notch 10 through the second opening 101. Rotate the first shaft 1 and the second shaft 2 relative to each other so that the first side 102 of the notch 10 fits against the first side 200 of the first protrusion 20. An insertion space is formed inside the notch 10 and between the second side 201 of the first protrusion 20 and the second side 103 of the notch 10. Figure 4 As shown; Next, the fastening block 3 is inserted into the insertion space of the notch 10 through the first opening 100. At this time, the first protrusion 20 and the fastening block 3 are simultaneously inserted into the notch 10, so that the second side 201 of the first protrusion 20 fits against the first side 30 of the fastening block 3, and the second side 31 of the fastening block 3 fits against the second side 103 of the notch 10, thereby restricting the position of the first shaft 1 and the second shaft 2 in the circumferential direction. The fastener 3 is fixed by interference fit, such as... Figure 5 As shown.

[0030] Example 2: like Figure 7 , 8 As shown: This embodiment is basically the same as Embodiment 1, except that the fastening block 3 is composed of multiple parts. In this embodiment: the fastening block 3 includes a first part 3a and a second part 3b, which are connected by a connector 3c. The overall width of the first part 3a and the second part 3b is adjustable, that is, the distance between the first side 30 and the second side 31 of the fastening block 3 is adjustable.

[0031] The following is a specific implementation method in which the overall width of the first component 3a and the second component 3b is adjustable: The faces of the first component 3a and the second component 3b are at least partially inclined surfaces 32. The inclined surfaces 32 of the first component 3a and the second component 3b are in contact. The distance between the first side surface 30 and the second side surface 31 of the fastener is adjusted by sliding the inclined surfaces 32. After adjustment, they are connected by the connector 3c. The connector 3c can be made of screws or the like.

[0032] The advantages of this embodiment compared to Embodiment 1 are: each notch 10 can be accurately fixed by adjusting the width of the fastener 3, or fine-tuning can be achieved by changing the combination of fasteners 3; at the same time, the paired inclined surfaces 32 have adjustment and self-locking functions, the requirements for machining accuracy of this structure can be appropriately reduced, and machining can be completed without special equipment, thus solving the error problems of axial fixing, machining and installation.

[0033] Example 3: like Figure 9-13 As shown: This embodiment is basically the same as Embodiment 1, except that: at least one of the first side 102 and the second side 103 of the notch 10 is provided with a limiting structure. When the first shaft 1 and the second shaft 2 are connected, the limiting structure can restrict the first protrusion 20 from axially disengaging from the notch 10, so as to restrict the position of the first shaft 1 and the second shaft 2 in the axial direction.

[0034] The following details the implementation of the limiting structure: The limiting structure is an inclined surface: the first side 102 and / or the second side 103 of the notch 10 on the first shaft 1 are inclined surfaces 104, specifically: the inclined surface 104 extends outward from the second opening 101 of the notch 10 in an axial and radial direction; similarly, the first side 200 and / or the second side 201 of the first protrusion of the second shaft 2 are also inclined surfaces 202. In the illustration: the notch 10 and the second protrusion 20 have only one side with inclined surfaces 104 and 202, respectively. Figure 13 As shown.

[0035] Of course, the limiting structure can also be a stepped surface 105, such as... Figure 14 As shown.

[0036] Example 4: like Figure 15 As shown: This embodiment is a combination of embodiments two and three.

[0037] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A shaft end connection structure, comprising a first shaft and a second shaft, characterized in that: The first shaft has at least one notch at one end, the notch forming a first opening on its circumferential surface and a second opening on its end face; the second shaft has a first protrusion at one end; the connecting structure also includes a fastening block, when the first shaft and the second shaft are connected: the first protrusion and the fastening block are simultaneously inserted into the notch, and the sum of the widths of the first protrusion and the fastening block is the same as the width of the first opening.

2. The shaft end connection structure according to claim 1, characterized in that: The notch portion has a first side and a second side that are arranged opposite to each other. The first protrusion portion has a first side and a second side located on both sides. The fastening block has a first side and a second side located on both sides. When the first shaft and the second shaft are connected: the first side of the notch portion is in contact with the first side of the first protrusion portion, the second side of the first protrusion portion is in contact with the first side of the fastening block, and the second side of the fastening block is in contact with the second side of the notch portion.

3. The shaft end connection structure according to claim 2, characterized in that: The first and second sides of the notch are parallel.

4. The shaft end connection structure according to claim 3, characterized in that: The first and second sides of the notch extend axially toward the first axis.

5. The shaft end connection structure according to claim 2, characterized in that: At least one of the first and second sides of the notch is provided with a limiting structure. When the first and second shafts are connected, the limiting structure can prevent the first protrusion from axially disengaging from the notch.

6. The shaft end connection structure according to claim 5, characterized in that: The limiting structure is an inclined surface.

7. The shaft end connection structure according to claim 1, characterized in that: The fastening block may be a single unit or may be composed of multiple components joined together.

8. The shaft end connection structure according to claim 1 or 7, characterized in that: The fastening block includes a first component and a second component, which are connected by a connector, and the overall width of the first component and the second component is adjustable. The faces of the first and second components that are opposite each other are at least partially inclined.

9. The shaft end connection structure according to claim 1, characterized in that: The first shaft has a groove at one end; the second shaft has a second protrusion at one end. When the first shaft and the second shaft are connected, the second protrusion is inserted into the groove, and the radial cross-section of the groove and the second protrusion is circular.

10. The shaft end connection structure according to claim 1, characterized in that: The number of notches is 2 to 6, and the number of first protrusions is the same as the number of notches; The notches are evenly distributed, and the position of the first protrusion corresponds to the position of the notches.

Images