Detachable combination key and coupling mechanism

Abstract

The utility model provides a detachable combination key and a coupling mechanism, and relates to the field of couplings. The detachable combination key comprises a third key pin and a second key pin, wherein the section of the third key pin is an isosceles trapezoid; the section of each of the first key pin and the second key pin is a right trapezoid, and the first inclined waist surface and the second inclined waist surface of each of the first key pin and the second key pin abut against the first isosceles surface and the second isosceles surface of the third key pin respectively; and the fastening assembly is arranged on the third lower bottom surface of the third key pin. The coupling mechanism comprises: a rotating shaft, the side surface of which is provided with a rotating shaft key hole; the first coupler sleeves the rotating shaft, and a first through hole is formed in the side surface of the first coupler; one end of the second coupler sleeves the first coupler, and a second through hole is formed in the side surface of the second coupler; the detachable combination key is arranged in the rotating shaft key hole, the first through hole and the second through hole in a penetrating mode and fixed to the outer side face of the second coupler through a fastening assembly. The connecting stability and the firmness degree of the coupling mechanism are improved.

Description

Technical Field

[0001] The utility model relates to the field of couplings, in particular to a detachable combination key and a coupling mechanism. Background Art

[0002] Couplings are devices used to connect two or more rotating shafts in mechanical transmission systems to transmit torque and motion. They can compensate for axial, radial and angular misalignment between shafts while providing a certain degree of flexibility and shock absorption. Removable keys, also known as key pins, are mechanical elements used to connect and transmit torque between rotating shafts and couplings, hubs, etc. They can be easily installed and removed.

[0003] In the prior art, the detachable key used to connect the rotating shaft and the coupling usually has a rectangular or approximately rectangular cross-section. It is easy to wear during repeated installation and disassembly, causing the rectangular cross-section to deform, thereby causing a gap between the mounting hole and the detachable key, affecting the stability and firmness of the connection. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that the detachable key is easily worn during repeated installation and disassembly, causing the rectangular cross-section to deform, thereby causing a gap between the mounting hole and the detachable key, affecting the connection stability and firmness. The utility model provides a detachable combination key and coupling mechanism that is suitable for repeated installation and disassembly and is not prone to gaps.

[0005] The technical solution adopted by the utility model is:

[0006] A detachable combination key, comprising:

[0007] The third key pin has an isosceles trapezoidal cross section;

[0008] The first key pin and the second key pin have right-angled trapezoidal cross sections, and the first oblique waist surface and the second oblique waist surface of the first key pin and the second key pin abut against the first isosceles surface and the second isosceles surface of the third key pin respectively; and

[0009] A fastening assembly, disposed on the third lower bottom surface of the third key pin, and used for pressing the third key pin;

[0010] The third upper bottom surface of the third key pin is arranged toward the first lower bottom surface and the second lower bottom surface of the first key pin and the second key pin, and is spaced apart from both, leaving an adjustable cavity.

[0011] Furthermore, the fastening assembly at least has:

[0012] a sealing rubber pad, one surface of which abuts against the third lower bottom surface of the third key pin;

[0013] A flange is arranged on the other side of the sealing gasket; and

[0014] A plurality of clamping bolts are passed through the flange and used for connecting the flange and a workpiece.

[0015] Furthermore, an inner protrusion is arranged on a surface of the sealing rubber pad abutting against the third lower bottom surface, and the inner protrusion is arranged directly opposite to the third lower bottom surface and has a shape adapted thereto.

[0016] Furthermore, the first upper bottom surface and the second upper bottom surface of the first key pin and the second key pin face the third lower bottom surface of the third key pin during installation, and are spaced apart from the third lower bottom surface, so that one end of the third lower bottom surface of the third key pin protrudes upward.

[0017] Furthermore, the first and second oblique waist surfaces of the first and second key pins are both provided with convex ribs, the first and second isosceles surfaces of the third key pin are provided with grooves, and the convex ribs are engaged in the grooves.

[0018] A coupling mechanism, comprising:

[0019] A rotating shaft, a rotating shaft key hole is provided on the side thereof;

[0020] A first coupling, which is sleeved on the rotating shaft and has a first through hole on its side corresponding to the position of the key hole of the rotating shaft;

[0021] A second coupling, one end of which is sleeved on the first coupling and a second through hole corresponding to the position of the first through hole is provided on its side; and

[0022] The detachable combination key as described above is inserted into the shaft key hole, the first through hole and the second through hole, and is fixed to the outer side surface of the second coupling through the fastening assembly.

[0023] Furthermore, a first outer boss surrounding the first through hole is disposed on a side surface of the first coupling, and a second outer boss surrounding the second through hole is disposed on a side surface of the second coupling, and the second outer boss is sleeved on the first outer boss.

[0024] Furthermore, a radially outward surface of the second outer boss is a plane adapted to the fastening assembly.

[0025] Furthermore, the shaft key hole, the first through hole, the second through hole and the detachable combination key are all provided in plurality.

[0026] The beneficial effects of the utility model are:

[0027] 1. The utility model provides a first key pin, a second key pin and a third key pin, and relies on leaving an adjustable space to convert the pressing force applied by the fastening assembly into a lateral movement of the first key pin and the second key pin to eliminate the gap on both sides, thereby conveniently achieving the elimination of the gap during repeated disassembly and installation, and solving the problem in the prior art that the detachable key is easily worn during repeated installation and disassembly, causing the rectangular cross-section to deform, thereby causing a gap between the installation hole and the detachable key, affecting the stability and firmness of the connection;

[0028] 2. The utility model also sets a distance between the first upper bottom surface and the second upper bottom surface and the third lower bottom surface, so that one end of the third lower bottom surface of the third key pin protrudes upward, cooperating with the inner protrusion on the sealing gasket that is adapted to it, thereby avoiding the sealing gasket from pressing the first key pin and the second key pin on both sides when pressed down, affecting the movement of the two to both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a three-dimensional exploded view of the coupling mechanism of the embodiment of the utility model;

[0031] Figure 2 This is a schematic diagram of the splitting of the combination key of an embodiment of the utility model;

[0032] Figure 3 It is a schematic diagram of assembling the combination key of the embodiment of the utility model.

[0033] Reference numerals: 100 - shaft, 101 - shaft key hole, 130 - adjustable cavity;

[0034] 200 - first coupling, 210 - first outer boss, 211 - first through hole;

[0035] 320-fastening assembly, 322-pressing bolt, 324-sealing pad, 325-inner protrusion, 326-flange, 340-first key pin, 341-first oblique waist surface, 342-first lower bottom surface, 343-first straight waist surface, 348-first upper bottom surface, 350-convex rib, 360-second key pin, 361-second oblique waist surface, 362-second lower bottom surface, 363-second straight waist surface, 368-second upper bottom surface, 370-groove, 380-third key pin, 382-third upper bottom surface, 384-first isosceles surface, 386-second isosceles surface, 388-third lower bottom surface;

[0036] 400 - second coupling, 410 - second outer boss, 411 - second through hole. DETAILED DESCRIPTION

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0039] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0040] See also Figure 2 , Figure 3 The first embodiment provides a detachable combination key for connecting components that transmit torque, which can prevent gaps between components from affecting the effectiveness of the connection. The detachable combination key mainly includes: a first key pin 340, a second key pin 360, a third key pin 380 and a fastening assembly 320.

[0041] like Figure 2 , Figure 3As shown in , the first key pin 340 and the second key pin 360 are used to abut against the inner wall of the mounting hole of the workpiece, and the third key pin 380 is arranged between the two and is used to move in a direction perpendicular to the mounting surface to adjust the distance between the first key pin 340 and the second key pin 360 and the inner wall of the mounting hole. The cross section of the third key pin 380 is an isosceles trapezoid, and the cross sections of the first key pin 340 and the second key pin 360 are both isosceles trapezoids. The first oblique waist surface 341 and the second oblique waist surface 361 of the first key pin 340 and the second key pin 360 abut against the first isosceles surface 384 and the second isosceles surface 386 of the third key pin 380 respectively; the first straight waist surface 343 and the second straight waist surface 363 of the first key pin 340 and the second key pin 360 abut against the inner wall of the mounting hole. Furthermore, the first upper bottom surface 348 and the second upper bottom surface 368 of the first key pin 340 and the second key pin 360 face the third lower bottom surface 388 of the third key pin 380 during installation, and both maintain a distance therefrom, so that in the installation hole, one end of the third lower bottom surface 388 of the third key pin 380 protrudes upward, which is convenient for the fastening assembly 320 to apply a pressing force thereto, and also makes it easier for the third key pin 380 to be disassembled. At the same time, the third upper bottom surface 382 of the third key pin 380 faces the first lower bottom surface 342 and the second lower bottom surface 362 of the first key pin 340 and the second key pin 360 during installation, and both maintain a distance therefrom, so that an adjustable cavity 130 is reserved in the installation hole. By setting the adjustable cavity 130, during the process of repeatedly removing the installation combination key, the position of the third key pin 380 can be adjusted in a direction perpendicular to the installation surface, and then the first isosceles surface 384 and the second isosceles surface 386 on both sides are used to slide and squeeze the first oblique waist surface 341 and the second oblique waist surface 361 respectively, so that the first straight waist surface 343 and the second straight waist surface 363 on both sides of the first key pin 340 and the second key pin 360 move to both sides and keep in contact with the inner wall of the installation hole, thereby eliminating the gap between the combination key and the inner wall.

[0042] In order to keep the first key pin 340 and the second key pin 360 in close contact with the inner wall of the mounting hole, it is also necessary to apply sufficient pressure to the third key pin 380 to keep the position stable. Figure 2 , Figure 3As shown in , the fastening assembly 320 is arranged on the third lower bottom surface 388 of the third key pin 380, and is used to press the third key pin 380. In this embodiment, the fastening assembly 320 is mainly composed of a sealing rubber pad 324, a flange 326 and a clamping bolt 322. Among them, one side of the sealing rubber pad 324 abuts against the third lower bottom surface 388 of the third key pin 380; the flange 326 is arranged on the other side of the sealing rubber pad 324; and four clamping bolts 322 are penetrated on the flange 326, and are used to connect the flange 326 and the workpiece. At the same time, the clamping bolts 322 also make the flange 326 press the sealing rubber pad 324, so as to apply a stable clamping force to the third key pin 380 through the sealing rubber pad 324. In this embodiment, an inner protrusion 325 is provided on one side of the sealing pad 324 abutting against the third lower bottom surface 388. The inner protrusion 325 faces the third lower bottom surface 388 and its shape is adapted thereto, thereby avoiding pressing the first key pin 340 and the second key pin 360 on both sides and affecting their movement to both sides.

[0043] A specific implementation of this embodiment is:

[0044] During installation, the installation holes of the workpiece are first connected, the first key pin 340 and the second key pin 360 are first installed in the installation hole, and then the third key pin 380 is installed between the first key pin 340 and the second key pin 360, and the first adjustable cavity 130 is reserved in the installation hole. Finally, the sealing pad 324, the flange 326 and the clamping bolt 322 are installed in sequence to clamp the third key pin 380 and eliminate the gap between the first key pin 340 and the second key pin 360 and the installation hole. During disassembly, the clamping bolt 322, the flange 326 and the sealing pad 324 are first removed in sequence. At this time, the third key pin 380 is no longer restricted by the clamping force, and one end of its larger third lower bottom surface 388 is set outward and protrudes upward, so it can be easily taken out from between the first key pin 340 and the second key pin 360. After that, the first key pin 340 and the second key pin 360 are no longer subject to pressure and can also be easily taken out of the installation hole.

[0045] In this embodiment, the detachable combination key is provided with a first key pin 340, a second key pin 360 and a third key pin 380, and relies on leaving an adjustable cavity 130 to convert the clamping force applied by the fastening assembly into lateral movement of the first key pin 340 and the second key pin 360 to eliminate the gap on both sides, thereby conveniently realizing the elimination of the gap during repeated disassembly and installation, and solving the problem in the prior art that the detachable key is easily worn during repeated installation and disassembly, causing the rectangular cross-section to deform, thereby causing a gap between the installation hole and the detachable key, affecting the stability and firmness of the connection.

[0046] At the same time, in this embodiment, the spacing between the first upper bottom surface 348 and the second upper bottom surface 368 and the third lower bottom surface 388 is set, so that one end of the third lower bottom surface 388 of the third key pin 380 protrudes upward, cooperating with the inner protrusion 325 on the sealing pad 324 that is adapted to it, thereby avoiding the sealing pad 324 from pressing on the first key pin 340 and the second key pin 360 on both sides when being pressed down, thereby affecting the movement of the two to both sides.

[0047] Preferably, if Figure 1 As shown, in this embodiment, ribs 350 can be provided on the first oblique waist surface 341 and the second oblique waist surface 361 of the first key pin 340 and the second key pin 360, and grooves 370 engaged with the ribs 350 can be provided on the first isosceles surface 384 and the second isosceles surface 386 of the third key pin 380. The ribs 350 and the grooves 370 are provided to limit the relative sliding of the first key pin 340, the second key pin 360 and the third key pin 380, thereby avoiding misalignment between the first key pin 340, the second key pin 360 and the third key pin 380, thereby affecting the effectiveness of the connection. Furthermore, the ribs 350 and the grooves 370 can be provided in plurality to further improve stability.

[0048] A coupling mechanism is provided in the second embodiment. The coupling mechanism is combined with the detachable combination key in the above embodiment to obtain a coupling mechanism suitable for repeated installation and disassembly. The coupling mechanism is suitable for application in certain adjustable mechanical structures. The detachable coupling mechanism facilitates users to repeatedly adjust the position of components as needed, and is not prone to gaps, thereby ensuring the performance of the equipment.

[0049] See also Figure 1 The coupling mechanism in the second embodiment can be used between components that need to transmit torque. The coupling mechanism mainly includes: a rotating shaft 100, a first coupling 200, a second coupling 400 and the detachable combination key in the above embodiment.

[0050] like Figure 1 As shown in the figure, the rotating shaft 100 is used as the driving shaft of the coupling mechanism of this embodiment. A rotating shaft key hole 101 is provided on the side of the rotating shaft 100 for inserting a detachable combination key.

[0051] like Figure 1As shown in , the first coupling 200 and the second coupling 400 are used to connect the rotating shaft 100 and the driven shaft to transmit axial rotational motion. The first coupling 200 is sleeved on the rotating shaft 100, and a first through hole 211 corresponding to the position of the rotating shaft key hole 101 is provided on its side for inserting a detachable combination key. One end of the second coupling 400 is sleeved on the first coupling 200, and a second through hole 411 corresponding to the position of the first through hole 211 is provided on its side for inserting a detachable combination key, and the other end of the second coupling 400 is used to sleeve the driven shaft. In this embodiment, a first outer boss 210 surrounding the first through hole 211 is provided on the side of the first coupling 200, and a second outer boss 410 surrounding the second through hole 411 is provided on the side of the second coupling 400. The second outer boss 410 and the first outer boss 210 are both cylindrical, and a cylindrical notch is provided inside the second outer boss 410, through which the first outer boss 210 is sleeved, so as to facilitate the docking of the first through hole 211 and the second through hole 411 during installation. In addition, the radially outward side of the second outer boss 410 is a plane adapted to the sealing pad 324 and the flange 326 of the fastening assembly 320, so that the fastening assembly 320 can be stably installed.

[0052] like Figure 1 As shown in, in this embodiment, the detachable combination key is inserted into the shaft key hole 101, the first through hole 211 and the second through hole 411, and is fixed on the outer surface of the second coupling 400 by the fastening assembly 320, so that the shaft 100, the first coupling 200 and the second coupling 400 are fixedly connected together, and the detachable combination key is not easy to produce gaps and the connection is stable. The coupling mechanism of this embodiment can be stably transmitted, and it is not easy to produce gaps and looseness during repeated installation and disassembly. The detachable combination key structure in this embodiment can adopt any one of the above embodiments, and multiple detachable combination keys can also be evenly arranged along the circumference of the second coupling 400 to jointly bear the torque transmission between the rotating parts on both sides, reduce stress concentration, avoid excessive loss, and thus improve the service life of the coupling mechanism. At the same time, multiple shaft key holes 101, the first through hole 211 and the second through hole 411 are also arranged to install the detachable combination key.

[0053] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A detachable combination key, characterized in that: Include: A third key pin (380) having an isosceles trapezoidal cross section; The first key pin (340) and the second key pin (360) both have right-angled trapezoidal cross-sections, and the first oblique waist surface (341) and the second oblique waist surface (361) of the first key pin (340) and the second key pin (360) respectively abut against the first isosceles surface (384) and the second isosceles surface (386) of the third key pin (380); and A fastening assembly (320), arranged on the third lower bottom surface (388) of the third key pin (380), and used for pressing the third key pin (380); The third upper bottom surface (382) of the third key pin (380) is arranged in the direction of the first lower bottom surface (342) and the second lower bottom surface (362) of the first key pin (340) and the second key pin (360), and is spaced apart from both, leaving an adjustable cavity (130).

2. The detachable combination key according to claim 1, characterized in that: The fastening assembly (320) at least comprises: a sealing rubber pad (324), one surface of which abuts against the third lower bottom surface (388) of the third key pin (380); a flange (326) disposed on the other side of the sealing rubber gasket (324); and A plurality of clamping bolts (322) are inserted through the flange (326) and are used to connect the flange (326) to a workpiece.

3. The detachable combination key according to claim 2, characterized in that: An inner protrusion (325) is provided on the side of the sealing rubber pad (324) abutting against the third lower bottom surface (388); the inner protrusion (325) is arranged opposite to the third lower bottom surface (388) and has a shape that matches the third lower bottom surface (388).

4. The detachable combination key according to claim 1, characterized in that: When installed, the first upper bottom surface (348) and the second upper bottom surface (368) of the first key pin (340) and the second key pin (360) face the direction of the third lower bottom surface (388) of the third key pin (380) and are spaced apart from each other, so that one end of the third lower bottom surface (388) of the third key pin (380) protrudes upward.

5. The detachable combination key according to claim 1, characterized in that: The first oblique waist surface (341) and the second oblique waist surface (361) of the first key pin (340) and the second key pin (360) are both provided with convex ribs (350), and the first isosceles surface (384) and the second isosceles surface (386) of the third key pin (380) are provided with grooves (370), and the convex ribs (350) are engaged in the grooves (370).

6. A coupling mechanism, characterized in that: Include: A rotating shaft (100) having a rotating shaft key hole (101) on its side; A first coupling (200) is sleeved on the rotating shaft (100), and a first through hole (211) corresponding to the position of the rotating shaft key hole (101) is provided on a side surface thereof; A second coupling (400), one end of which is sleeved on the first coupling (200), and a second through hole (411) corresponding to the position of the first through hole (211) is provided on a side surface thereof; and The detachable combination key according to any one of claims 1 to 5 is inserted into the shaft key hole (101), the first through hole (211) and the second through hole (411), and is fixed to the outer surface of the second coupling (400) through the fastening assembly (320).

7. The coupling mechanism according to claim 6, characterized in that: A first outer boss (210) surrounding the first through hole (211) is disposed on the side of the first coupling (200), and a second outer boss (410) surrounding the second through hole (411) is disposed on the side of the second coupling (400), wherein the second outer boss (410) is sleeved on the first outer boss (210).

8. The coupling mechanism according to claim 7, characterized in that: A radially outward surface of the second outer boss (410) is a plane adapted to fit the fastening assembly (320).

9. The coupling mechanism according to claim 6, characterized in that: The rotating shaft key hole (101), the first through hole (211), the second through hole (411) and the detachable combination key are all provided in plurality.

Images